diff options
Diffstat (limited to 'drivers/misc')
28 files changed, 11297 insertions, 3693 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index f5ade1904aa..a726f3b01a6 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -426,9 +426,11 @@ config ENCLOSURE_SERVICES config SGI_XP tristate "Support communication between SGI SSIs" - depends on IA64_GENERIC || IA64_SGI_SN2 + depends on NET + depends on (IA64_GENERIC || IA64_SGI_SN2 || IA64_SGI_UV || X86_64) && SMP select IA64_UNCACHED_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2 select GENERIC_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2 + select SGI_GRU if (IA64_GENERIC || IA64_SGI_UV || X86_64) && SMP ---help--- An SGI machine can be divided into multiple Single System Images which act independently of each other and have @@ -450,4 +452,27 @@ config HP_ILO To compile this driver as a module, choose M here: the module will be called hpilo. +config SGI_GRU + tristate "SGI GRU driver" + depends on (X86_64 || IA64_SGI_UV || IA64_GENERIC) && SMP + default n + select MMU_NOTIFIER + ---help--- + The GRU is a hardware resource located in the system chipset. The GRU + contains memory that can be mmapped into the user address space. This memory is + used to communicate with the GRU to perform functions such as load/store, + scatter/gather, bcopy, AMOs, etc. The GRU is directly accessed by user + instructions using user virtual addresses. GRU instructions (ex., bcopy) use + user virtual addresses for operands. + + If you are not running on a SGI UV system, say N. + +config SGI_GRU_DEBUG + bool "SGI GRU driver debug" + depends on SGI_GRU + default n + ---help--- + This option enables addition debugging code for the SGI GRU driver. If + you are unsure, say N. + endif # MISC_DEVICES diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index f5e273420c0..c6c13f60b45 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -28,4 +28,5 @@ obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o obj-$(CONFIG_KGDB_TESTS) += kgdbts.o obj-$(CONFIG_SGI_XP) += sgi-xp/ +obj-$(CONFIG_SGI_GRU) += sgi-gru/ obj-$(CONFIG_HP_ILO) += hpilo.o diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c index e7a3fe508df..b2d9878dc3f 100644 --- a/drivers/misc/acer-wmi.c +++ b/drivers/misc/acer-wmi.c @@ -803,11 +803,30 @@ static acpi_status get_u32(u32 *value, u32 cap) static acpi_status set_u32(u32 value, u32 cap) { + acpi_status status; + if (interface->capability & cap) { switch (interface->type) { case ACER_AMW0: return AMW0_set_u32(value, cap, interface); case ACER_AMW0_V2: + if (cap == ACER_CAP_MAILLED) + return AMW0_set_u32(value, cap, interface); + + /* + * On some models, some WMID methods don't toggle + * properly. For those cases, we want to run the AMW0 + * method afterwards to be certain we've really toggled + * the device state. + */ + if (cap == ACER_CAP_WIRELESS || + cap == ACER_CAP_BLUETOOTH) { + status = WMID_set_u32(value, cap, interface); + if (ACPI_FAILURE(status)) + return status; + + return AMW0_set_u32(value, cap, interface); + } case ACER_WMID: return WMID_set_u32(value, cap, interface); default: diff --git a/drivers/misc/sgi-gru/Makefile b/drivers/misc/sgi-gru/Makefile new file mode 100644 index 00000000000..d03597a521b --- /dev/null +++ b/drivers/misc/sgi-gru/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_SGI_GRU) := gru.o +gru-y := grufile.o grumain.o grufault.o grutlbpurge.o gruprocfs.o grukservices.o + diff --git a/drivers/misc/sgi-gru/gru.h b/drivers/misc/sgi-gru/gru.h new file mode 100644 index 00000000000..40df7cb3f0a --- /dev/null +++ b/drivers/misc/sgi-gru/gru.h @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __GRU_H__ +#define __GRU_H__ + +/* + * GRU architectural definitions + */ +#define GRU_CACHE_LINE_BYTES 64 +#define GRU_HANDLE_STRIDE 256 +#define GRU_CB_BASE 0 +#define GRU_DS_BASE 0x20000 + +/* + * Size used to map GRU GSeg + */ +#if defined CONFIG_IA64 +#define GRU_GSEG_PAGESIZE (256 * 1024UL) +#elif defined CONFIG_X86_64 +#define GRU_GSEG_PAGESIZE (256 * 1024UL) /* ZZZ 2MB ??? */ +#else +#error "Unsupported architecture" +#endif + +/* + * Structure for obtaining GRU resource information + */ +struct gru_chiplet_info { + int node; + int chiplet; + int blade; + int total_dsr_bytes; + int total_cbr; + int total_user_dsr_bytes; + int total_user_cbr; + int free_user_dsr_bytes; + int free_user_cbr; +}; + +/* Flags for GRU options on the gru_create_context() call */ +/* Select one of the follow 4 options to specify how TLB misses are handled */ +#define GRU_OPT_MISS_DEFAULT 0x0000 /* Use default mode */ +#define GRU_OPT_MISS_USER_POLL 0x0001 /* User will poll CB for faults */ +#define GRU_OPT_MISS_FMM_INTR 0x0002 /* Send interrupt to cpu to + handle fault */ +#define GRU_OPT_MISS_FMM_POLL 0x0003 /* Use system polling thread */ +#define GRU_OPT_MISS_MASK 0x0003 /* Mask for TLB MISS option */ + + + +#endif /* __GRU_H__ */ diff --git a/drivers/misc/sgi-gru/gru_instructions.h b/drivers/misc/sgi-gru/gru_instructions.h new file mode 100644 index 00000000000..0dc36225c7c --- /dev/null +++ b/drivers/misc/sgi-gru/gru_instructions.h @@ -0,0 +1,669 @@ +/* + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __GRU_INSTRUCTIONS_H__ +#define __GRU_INSTRUCTIONS_H__ + +#define gru_flush_cache_hook(p) +#define gru_emulator_wait_hook(p, w) + +/* + * Architecture dependent functions + */ + +#if defined CONFIG_IA64 +#include <linux/compiler.h> +#include <asm/intrinsics.h> +#define __flush_cache(p) ia64_fc(p) +/* Use volatile on IA64 to ensure ordering via st4.rel */ +#define gru_ordered_store_int(p,v) \ + do { \ + barrier(); \ + *((volatile int *)(p)) = v; /* force st.rel */ \ + } while (0) +#elif defined CONFIG_X86_64 +#define __flush_cache(p) clflush(p) +#define gru_ordered_store_int(p,v) \ + do { \ + barrier(); \ + *(int *)p = v; \ + } while (0) +#else +#error "Unsupported architecture" +#endif + +/* + * Control block status and exception codes + */ +#define CBS_IDLE 0 +#define CBS_EXCEPTION 1 +#define CBS_ACTIVE 2 +#define CBS_CALL_OS 3 + +/* CB substatus bitmasks */ +#define CBSS_MSG_QUEUE_MASK 7 +#define CBSS_IMPLICIT_ABORT_ACTIVE_MASK 8 + +/* CB substatus message queue values (low 3 bits of substatus) */ +#define CBSS_NO_ERROR 0 +#define CBSS_LB_OVERFLOWED 1 +#define CBSS_QLIMIT_REACHED 2 +#define CBSS_PAGE_OVERFLOW 3 +#define CBSS_AMO_NACKED 4 +#define CBSS_PUT_NACKED 5 + +/* + * Structure used to fetch exception detail for CBs that terminate with + * CBS_EXCEPTION + */ +struct control_block_extended_exc_detail { + unsigned long cb; + int opc; + int ecause; + int exopc; + long exceptdet0; + int exceptdet1; +}; + +/* + * Instruction formats + */ + +/* + * Generic instruction format. + * This definition has precise bit field definitions. + */ +struct gru_instruction_bits { + /* DW 0 - low */ + unsigned int icmd: 1; + unsigned char ima: 3; /* CB_DelRep, unmapped mode */ + unsigned char reserved0: 4; + unsigned int xtype: 3; + unsigned int iaa0: 2; + unsigned int iaa1: 2; + unsigned char reserved1: 1; + unsigned char opc: 8; /* opcode */ + unsigned char exopc: 8; /* extended opcode */ + /* DW 0 - high */ + unsigned int idef2: 22; /* TRi0 */ + unsigned char reserved2: 2; + unsigned char istatus: 2; + unsigned char isubstatus:4; + unsigned char reserved3: 2; + /* DW 1 */ + unsigned long idef4; /* 42 bits: TRi1, BufSize */ + /* DW 2-6 */ + unsigned long idef1; /* BAddr0 */ + unsigned long idef5; /* Nelem */ + unsigned long idef6; /* Stride, Operand1 */ + unsigned long idef3; /* BAddr1, Value, Operand2 */ + unsigned long reserved4; + /* DW 7 */ + unsigned long avalue; /* AValue */ +}; + +/* + * Generic instruction with friendlier names. This format is used + * for inline instructions. + */ +struct gru_instruction { + /* DW 0 */ + unsigned int op32; /* icmd,xtype,iaa0,ima,opc */ + unsigned int tri0; + unsigned long tri1_bufsize; /* DW 1 */ + unsigned long baddr0; /* DW 2 */ + unsigned long nelem; /* DW 3 */ + unsigned long op1_stride; /* DW 4 */ + unsigned long op2_value_baddr1; /* DW 5 */ + unsigned long reserved0; /* DW 6 */ + unsigned long avalue; /* DW 7 */ +}; + +/* Some shifts and masks for the low 32 bits of a GRU command */ +#define GRU_CB_ICMD_SHFT 0 +#define GRU_CB_ICMD_MASK 0x1 +#define GRU_CB_XTYPE_SHFT 8 +#define GRU_CB_XTYPE_MASK 0x7 +#define GRU_CB_IAA0_SHFT 11 +#define GRU_CB_IAA0_MASK 0x3 +#define GRU_CB_IAA1_SHFT 13 +#define GRU_CB_IAA1_MASK 0x3 +#define GRU_CB_IMA_SHFT 1 +#define GRU_CB_IMA_MASK 0x3 +#define GRU_CB_OPC_SHFT 16 +#define GRU_CB_OPC_MASK 0xff +#define GRU_CB_EXOPC_SHFT 24 +#define GRU_CB_EXOPC_MASK 0xff + +/* GRU instruction opcodes (opc field) */ +#define OP_NOP 0x00 +#define OP_BCOPY 0x01 +#define OP_VLOAD 0x02 +#define OP_IVLOAD 0x03 +#define OP_VSTORE 0x04 +#define OP_IVSTORE 0x05 +#define OP_VSET 0x06 +#define OP_IVSET 0x07 +#define OP_MESQ 0x08 +#define OP_GAMXR 0x09 +#define OP_GAMIR 0x0a +#define OP_GAMIRR 0x0b +#define OP_GAMER 0x0c +#define OP_GAMERR 0x0d +#define OP_BSTORE 0x0e +#define OP_VFLUSH 0x0f + + +/* Extended opcodes values (exopc field) */ + +/* GAMIR - AMOs with implicit operands */ +#define EOP_IR_FETCH 0x01 /* Plain fetch of memory */ +#define EOP_IR_CLR 0x02 /* Fetch and clear */ +#define EOP_IR_INC 0x05 /* Fetch and increment */ +#define EOP_IR_DEC 0x07 /* Fetch and decrement */ +#define EOP_IR_QCHK1 0x0d /* Queue check, 64 byte msg */ +#define EOP_IR_QCHK2 0x0e /* Queue check, 128 byte msg */ + +/* GAMIRR - Registered AMOs with implicit operands */ +#define EOP_IRR_FETCH 0x01 /* Registered fetch of memory */ +#define EOP_IRR_CLR 0x02 /* Registered fetch and clear */ +#define EOP_IRR_INC 0x05 /* Registered fetch and increment */ +#define EOP_IRR_DEC 0x07 /* Registered fetch and decrement */ +#define EOP_IRR_DECZ 0x0f /* Registered fetch and decrement, update on zero*/ + +/* GAMER - AMOs with explicit operands */ +#define EOP_ER_SWAP 0x00 /* Exchange argument and memory */ +#define EOP_ER_OR 0x01 /* Logical OR with memory */ +#define EOP_ER_AND 0x02 /* Logical AND with memory */ +#define EOP_ER_XOR 0x03 /* Logical XOR with memory */ +#define EOP_ER_ADD 0x04 /* Add value to memory */ +#define EOP_ER_CSWAP 0x08 /* Compare with operand2, write operand1 if match*/ +#define EOP_ER_CADD 0x0c /* Queue check, operand1*64 byte msg */ + +/* GAMERR - Registered AMOs with explicit operands */ +#define EOP_ERR_SWAP 0x00 /* Exchange argument and memory */ +#define EOP_ERR_OR 0x01 /* Logical OR with memory */ +#define EOP_ERR_AND 0x02 /* Logical AND with memory */ +#define EOP_ERR_XOR 0x03 /* Logical XOR with memory */ +#define EOP_ERR_ADD 0x04 /* Add value to memory */ +#define EOP_ERR_CSWAP 0x08 /* Compare with operand2, write operand1 if match*/ +#define EOP_ERR_EPOLL 0x09 /* Poll for equality */ +#define EOP_ERR_NPOLL 0x0a /* Poll for inequality */ + +/* GAMXR - SGI Arithmetic unit */ +#define EOP_XR_CSWAP 0x0b /* Masked compare exchange */ + + +/* Transfer types (xtype field) */ +#define XTYPE_B 0x0 /* byte */ +#define XTYPE_S 0x1 /* short (2-byte) */ +#define XTYPE_W 0x2 /* word (4-byte) */ +#define XTYPE_DW 0x3 /* doubleword (8-byte) */ +#define XTYPE_CL 0x6 /* cacheline (64-byte) */ + + +/* Instruction access attributes (iaa0, iaa1 fields) */ +#define IAA_RAM 0x0 /* normal cached RAM access */ +#define IAA_NCRAM 0x2 /* noncoherent RAM access */ +#define IAA_MMIO 0x1 /* noncoherent memory-mapped I/O space */ +#define IAA_REGISTER 0x3 /* memory-mapped registers, etc. */ + + +/* Instruction mode attributes (ima field) */ +#define IMA_MAPPED 0x0 /* Virtual mode */ +#define IMA_CB_DELAY 0x1 /* hold read responses until status changes */ +#define IMA_UNMAPPED 0x2 /* bypass the TLBs (OS only) */ +#define IMA_INTERRUPT 0x4 /* Interrupt when instruction completes */ + +/* CBE ecause bits */ +#define CBE_CAUSE_RI (1 << 0) +#define CBE_CAUSE_INVALID_INSTRUCTION (1 << 1) +#define CBE_CAUSE_UNMAPPED_MODE_FORBIDDEN (1 << 2) +#define CBE_CAUSE_PE_CHECK_DATA_ERROR (1 << 3) +#define CBE_CAUSE_IAA_GAA_MISMATCH (1 << 4) +#define CBE_CAUSE_DATA_SEGMENT_LIMIT_EXCEPTION (1 << 5) +#define CBE_CAUSE_OS_FATAL_TLB_FAULT (1 << 6) +#define CBE_CAUSE_EXECUTION_HW_ERROR (1 << 7) +#define CBE_CAUSE_TLBHW_ERROR (1 << 8) +#define CBE_CAUSE_RA_REQUEST_TIMEOUT (1 << 9) +#define CBE_CAUSE_HA_REQUEST_TIMEOUT (1 << 10) +#define CBE_CAUSE_RA_RESPONSE_FATAL (1 << 11) +#define CBE_CAUSE_RA_RESPONSE_NON_FATAL (1 << 12) +#define CBE_CAUSE_HA_RESPONSE_FATAL (1 << 13) +#define CBE_CAUSE_HA_RESPONSE_NON_FATAL (1 << 14) +#define CBE_CAUSE_ADDRESS_SPACE_DECODE_ERROR (1 << 15) +#define CBE_CAUSE_RESPONSE_DATA_ERROR (1 << 16) +#define CBE_CAUSE_PROTOCOL_STATE_DATA_ERROR (1 << 17) + +/* + * Exceptions are retried for the following cases. If any OTHER bits are set + * in ecause, the exception is not retryable. + */ +#define EXCEPTION_RETRY_BITS (CBE_CAUSE_RESPONSE_DATA_ERROR | \ + CBE_CAUSE_RA_REQUEST_TIMEOUT | \ + CBE_CAUSE_TLBHW_ERROR | \ + CBE_CAUSE_HA_REQUEST_TIMEOUT) + +/* Message queue head structure */ +union gru_mesqhead { + unsigned long val; + struct { + unsigned int head; + unsigned int limit; + }; +}; + + +/* Generate the low word of a GRU instruction */ +static inline unsigned int +__opword(unsigned char opcode, unsigned char exopc, unsigned char xtype, + unsigned char iaa0, unsigned char iaa1, + unsigned char ima) +{ + return (1 << GRU_CB_ICMD_SHFT) | + (iaa0 << GRU_CB_IAA0_SHFT) | + (iaa1 << GRU_CB_IAA1_SHFT) | + (ima << GRU_CB_IMA_SHFT) | + (xtype << GRU_CB_XTYPE_SHFT) | + (opcode << GRU_CB_OPC_SHFT) | + (exopc << GRU_CB_EXOPC_SHFT); +} + +/* + * Architecture specific intrinsics + */ +static inline void gru_flush_cache(void *p) +{ + __flush_cache(p); +} + +/* + * Store the lower 32 bits of the command including the "start" bit. Then + * start the instruction executing. + */ +static inline void gru_start_instruction(struct gru_instruction *ins, int op32) +{ + gru_ordered_store_int(ins, op32); +} + + +/* Convert "hints" to IMA */ +#define CB_IMA(h) ((h) | IMA_UNMAPPED) + +/* Convert data segment cache line index into TRI0 / TRI1 value */ +#define GRU_DINDEX(i) ((i) * GRU_CACHE_LINE_BYTES) + +/* Inline functions for GRU instructions. + * Note: + * - nelem and stride are in elements + * - tri0/tri1 is in bytes for the beginning of the data segment. + */ +static inline void gru_vload(void *cb, unsigned long mem_addr, + unsigned int tri0, unsigned char xtype, unsigned long nelem, + unsigned long stride, unsigned long hints) +{ + struct gru_instruction *ins = (struct gru_instruction *)cb; + + ins->baddr0 = (long)mem_addr; + ins->nelem = nelem; + ins->tri0 = tri0; + ins->op1_stride = stride; + gru_start_instruction(ins, __opword(OP_VLOAD, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_vstore(void *cb, unsigned long mem_addr, + unsigned int tri0, unsigned char xtype, unsigned long nelem, + unsigned long stride, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->nelem = nelem; + ins->tri0 = tri0; + ins->op1_stride = stride; + gru_start_instruction(ins, __opword(OP_VSTORE, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_ivload(void *cb, unsigned long mem_addr, + unsigned int tri0, unsigned int tri1, unsigned char xtype, + unsigned long nelem, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->nelem = nelem; + ins->tri0 = tri0; + ins->tri1_bufsize = tri1; + gru_start_instruction(ins, __opword(OP_IVLOAD, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_ivstore(void *cb, unsigned long mem_addr, + unsigned int tri0, unsigned int tri1, + unsigned char xtype, unsigned long nelem, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->nelem = nelem; + ins->tri0 = tri0; + ins->tri1_bufsize = tri1; + gru_start_instruction(ins, __opword(OP_IVSTORE, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_vset(void *cb, unsigned long mem_addr, + unsigned long value, unsigned char xtype, unsigned long nelem, + unsigned long stride, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->op2_value_baddr1 = value; + ins->nelem = nelem; + ins->op1_stride = stride; + gru_start_instruction(ins, __opword(OP_VSET, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_ivset(void *cb, unsigned long mem_addr, + unsigned int tri1, unsigned long value, unsigned char xtype, + unsigned long nelem, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->op2_value_baddr1 = value; + ins->nelem = nelem; + ins->tri1_bufsize = tri1; + gru_start_instruction(ins, __opword(OP_IVSET, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_vflush(void *cb, unsigned long mem_addr, + unsigned long nelem, unsigned char xtype, unsigned long stride, + unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)mem_addr; + ins->op1_stride = stride; + ins->nelem = nelem; + gru_start_instruction(ins, __opword(OP_VFLUSH, 0, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_nop(void *cb, int hints) +{ + struct gru_instruction *ins = (void *)cb; + + gru_start_instruction(ins, __opword(OP_NOP, 0, 0, 0, 0, CB_IMA(hints))); +} + + +static inline void gru_bcopy(void *cb, const unsigned long src, + unsigned long dest, + unsigned int tri0, unsigned int xtype, unsigned long nelem, + unsigned int bufsize, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + ins->op2_value_baddr1 = (long)dest; + ins->nelem = nelem; + ins->tri0 = tri0; + ins->tri1_bufsize = bufsize; + gru_start_instruction(ins, __opword(OP_BCOPY, 0, xtype, IAA_RAM, + IAA_RAM, CB_IMA(hints))); +} + +static inline void gru_bstore(void *cb, const unsigned long src, + unsigned long dest, unsigned int tri0, unsigned int xtype, + unsigned long nelem, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + ins->op2_value_baddr1 = (long)dest; + ins->nelem = nelem; + ins->tri0 = tri0; + gru_start_instruction(ins, __opword(OP_BSTORE, 0, xtype, 0, IAA_RAM, + CB_IMA(hints))); +} + +static inline void gru_gamir(void *cb, int exopc, unsigned long src, + unsigned int xtype, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + gru_start_instruction(ins, __opword(OP_GAMIR, exopc, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_gamirr(void *cb, int exopc, unsigned long src, + unsigned int xtype, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + gru_start_instruction(ins, __opword(OP_GAMIRR, exopc, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_gamer(void *cb, int exopc, unsigned long src, + unsigned int xtype, + unsigned long operand1, unsigned long operand2, + unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + ins->op1_stride = operand1; + ins->op2_value_baddr1 = operand2; + gru_start_instruction(ins, __opword(OP_GAMER, exopc, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_gamerr(void *cb, int exopc, unsigned long src, + unsigned int xtype, unsigned long operand1, + unsigned long operand2, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + ins->op1_stride = operand1; + ins->op2_value_baddr1 = operand2; + gru_start_instruction(ins, __opword(OP_GAMERR, exopc, xtype, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline void gru_gamxr(void *cb, unsigned long src, + unsigned int tri0, unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)src; + ins->nelem = 4; + gru_start_instruction(ins, __opword(OP_GAMXR, EOP_XR_CSWAP, XTYPE_DW, + IAA_RAM, 0, CB_IMA(hints))); +} + +static inline void gru_mesq(void *cb, unsigned long queue, + unsigned long tri0, unsigned long nelem, + unsigned long hints) +{ + struct gru_instruction *ins = (void *)cb; + + ins->baddr0 = (long)queue; + ins->nelem = nelem; + ins->tri0 = tri0; + gru_start_instruction(ins, __opword(OP_MESQ, 0, XTYPE_CL, IAA_RAM, 0, + CB_IMA(hints))); +} + +static inline unsigned long gru_get_amo_value(void *cb) +{ + struct gru_instruction *ins = (void *)cb; + + return ins->avalue; +} + +static inline int gru_get_amo_value_head(void *cb) +{ + struct gru_instruction *ins = (void *)cb; + + return ins->avalue & 0xffffffff; +} + +static inline int gru_get_amo_value_limit(void *cb) +{ + struct gru_instruction *ins = (void *)cb; + + return ins->avalue >> 32; +} + +static inline union gru_mesqhead gru_mesq_head(int head, int limit) +{ + union gru_mesqhead mqh; + + mqh.head = head; + mqh.limit = limit; + return mqh; +} + +/* + * Get struct control_block_extended_exc_detail for CB. + */ +extern int gru_get_cb_exception_detail(void *cb, + struct control_block_extended_exc_detail *excdet); + +#define GRU_EXC_STR_SIZE 256 + +extern int gru_check_status_proc(void *cb); +extern int gru_wait_proc(void *cb); +extern void gru_wait_abort_proc(void *cb); + +/* + * Control block definition for checking status + */ +struct gru_control_block_status { + unsigned int icmd :1; + unsigned int unused1 :31; + unsigned int unused2 :24; + unsigned int istatus :2; + unsigned int isubstatus :4; + unsigned int inused3 :2; +}; + +/* Get CB status */ +static inline int gru_get_cb_status(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + + return cbs->istatus; +} + +/* Get CB message queue substatus */ +static inline int gru_get_cb_message_queue_substatus(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + + return cbs->isubstatus & CBSS_MSG_QUEUE_MASK; +} + +/* Get CB substatus */ +static inline int gru_get_cb_substatus(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + + return cbs->isubstatus; +} + +/* Check the status of a CB. If the CB is in UPM mode, call the + * OS to handle the UPM status. + * Returns the CB status field value (0 for normal completion) + */ +static inline int gru_check_status(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + int ret = cbs->istatus; + + if (ret == CBS_CALL_OS) + ret = gru_check_status_proc(cb); + return ret; +} + +/* Wait for CB to complete. + * Returns the CB status field value (0 for normal completion) + */ +static inline int gru_wait(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + int ret = cbs->istatus;; + + if (ret != CBS_IDLE) + ret = gru_wait_proc(cb); + return ret; +} + +/* Wait for CB to complete. Aborts program if error. (Note: error does NOT + * mean TLB mis - only fatal errors such as memory parity error or user + * bugs will cause termination. + */ +static inline void gru_wait_abort(void *cb) +{ + struct gru_control_block_status *cbs = (void *)cb; + + if (cbs->istatus != CBS_IDLE) + gru_wait_abort_proc(cb); +} + + +/* + * Get a pointer to a control block + * gseg - GSeg address returned from gru_get_thread_gru_segment() + * index - index of desired CB + */ +static inline void *gru_get_cb_pointer(void *gseg, + int index) +{ + return gseg + GRU_CB_BASE + index * GRU_HANDLE_STRIDE; +} + +/* + * Get a pointer to a cacheline in the data segment portion of a GSeg + * gseg - GSeg address returned from gru_get_thread_gru_segment() + * index - index of desired cache line + */ +static inline void *gru_get_data_pointer(void *gseg, int index) +{ + return gseg + GRU_DS_BASE + index * GRU_CACHE_LINE_BYTES; +} + +/* + * Convert a vaddr into the tri index within the GSEG + * vaddr - virtual address of within gseg + */ +static inline int gru_get_tri(void *vaddr) +{ + return ((unsigned long)vaddr & (GRU_GSEG_PAGESIZE - 1)) - GRU_DS_BASE; +} +#endif /* __GRU_INSTRUCTIONS_H__ */ diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c new file mode 100644 index 00000000000..3d33015bbf3 --- /dev/null +++ b/drivers/misc/sgi-gru/grufault.c @@ -0,0 +1,633 @@ +/* + * SN Platform GRU Driver + * + * FAULT HANDLER FOR GRU DETECTED TLB MISSES + * + * This file contains code that handles TLB misses within the GRU. + * These misses are reported either via interrupts or user polling of + * the user CB. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/spinlock.h> +#include <linux/mm.h> +#include <linux/hugetlb.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <asm/pgtable.h> +#include "gru.h" +#include "grutables.h" +#include "grulib.h" +#include "gru_instructions.h" +#include <asm/uv/uv_hub.h> + +/* + * Test if a physical address is a valid GRU GSEG address + */ +static inline int is_gru_paddr(unsigned long paddr) +{ + return paddr >= gru_start_paddr && paddr < gru_end_paddr; +} + +/* + * Find the vma of a GRU segment. Caller must hold mmap_sem. + */ +struct vm_area_struct *gru_find_vma(unsigned long vaddr) +{ + struct vm_area_struct *vma; + + vma = find_vma(current->mm, vaddr); + if (vma && vma->vm_start <= vaddr && vma->vm_ops == &gru_vm_ops) + return vma; + return NULL; +} + +/* + * Find and lock the gts that contains the specified user vaddr. + * + * Returns: + * - *gts with the mmap_sem locked for read and the GTS locked. + * - NULL if vaddr invalid OR is not a valid GSEG vaddr. + */ + +static struct gru_thread_state *gru_find_lock_gts(unsigned long vaddr) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + struct gru_thread_state *gts = NULL; + + down_read(&mm->mmap_sem); + vma = gru_find_vma(vaddr); + if (vma) + gts = gru_find_thread_state(vma, TSID(vaddr, vma)); + if (gts) + mutex_lock(>s->ts_ctxlock); + else + up_read(&mm->mmap_sem); + return gts; +} + +static struct gru_thread_state *gru_alloc_locked_gts(unsigned long vaddr) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + struct gru_thread_state *gts = NULL; + + down_write(&mm->mmap_sem); + vma = gru_find_vma(vaddr); + if (vma) + gts = gru_alloc_thread_state(vma, TSID(vaddr, vma)); + if (gts) { + mutex_lock(>s->ts_ctxlock); + downgrade_write(&mm->mmap_sem); + } else { + up_write(&mm->mmap_sem); + } + + return gts; +} + +/* + * Unlock a GTS that was previously locked with gru_find_lock_gts(). + */ +static void gru_unlock_gts(struct gru_thread_state *gts) +{ + mutex_unlock(>s->ts_ctxlock); + up_read(¤t->mm->mmap_sem); +} + +/* + * Set a CB.istatus to active using a user virtual address. This must be done + * just prior to a TFH RESTART. The new cb.istatus is an in-cache status ONLY. + * If the line is evicted, the status may be lost. The in-cache update + * is necessary to prevent the user from seeing a stale cb.istatus that will + * change as soon as the TFH restart is complete. Races may cause an + * occasional failure to clear the cb.istatus, but that is ok. + * + * If the cb address is not valid (should not happen, but...), nothing + * bad will happen.. The get_user()/put_user() will fail but there + * are no bad side-effects. + */ +static void gru_cb_set_istatus_active(unsigned long __user *cb) +{ + union { + struct gru_instruction_bits bits; + unsigned long dw; + } u; + + if (cb) { + get_user(u.dw, cb); + u.bits.istatus = CBS_ACTIVE; + put_user(u.dw, cb); + } +} + +/* + * Convert a interrupt IRQ to a pointer to the GRU GTS that caused the + * interrupt. Interrupts are always sent to a cpu on the blade that contains the + * GRU (except for headless blades which are not currently supported). A blade + * has N grus; a block of N consecutive IRQs is assigned to the GRUs. The IRQ + * number uniquely identifies the GRU chiplet on the local blade that caused the + * interrupt. Always called in interrupt context. + */ +static inline struct gru_state *irq_to_gru(int irq) +{ + return &gru_base[uv_numa_blade_id()]->bs_grus[irq - IRQ_GRU]; +} + +/* + * Read & clear a TFM + * + * The GRU has an array of fault maps. A map is private to a cpu + * Only one cpu will be accessing a cpu's fault map. + * + * This function scans the cpu-private fault map & clears all bits that + * are set. The function returns a bitmap that indicates the bits that + * were cleared. Note that sense the maps may be updated asynchronously by + * the GRU, atomic operations must be used to clear bits. + */ +static void get_clear_fault_map(struct gru_state *gru, + struct gru_tlb_fault_map *map) +{ + unsigned long i, k; + struct gru_tlb_fault_map *tfm; + + tfm = get_tfm_for_cpu(gru, gru_cpu_fault_map_id()); + prefetchw(tfm); /* Helps on hardware, required for emulator */ + for (i = 0; i < BITS_TO_LONGS(GRU_NUM_CBE); i++) { + k = tfm->fault_bits[i]; + if (k) + k = xchg(&tfm->fault_bits[i], 0UL); + map->fault_bits[i] = k; + } + + /* + * Not functionally required but helps performance. (Required + * on emulator) + */ + gru_flush_cache(tfm); +} + +/* + * Atomic (interrupt context) & non-atomic (user context) functions to + * convert a vaddr into a physical address. The size of the page + * is returned in pageshift. + * returns: + * 0 - successful + * < 0 - error code + * 1 - (atomic only) try again in non-atomic context + */ +static int non_atomic_pte_lookup(struct vm_area_struct *vma, + unsigned long vaddr, int write, + unsigned long *paddr, int *pageshift) +{ + struct page *page; + + /* ZZZ Need to handle HUGE pages */ + if (is_vm_hugetlb_page(vma)) + return -EFAULT; + *pageshift = PAGE_SHIFT; + if (get_user_pages + (current, current->mm, vaddr, 1, write, 0, &page, NULL) <= 0) + return -EFAULT; + *paddr = page_to_phys(page); + put_page(page); + return 0; +} + +/* + * + * atomic_pte_lookup + * + * Convert a user virtual address to a physical address + * Only supports Intel large pages (2MB only) on x86_64. + * ZZZ - hugepage support is incomplete + */ +static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr, + int write, unsigned long *paddr, int *pageshift) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pud_t *pudp; + pte_t pte; + + WARN_ON(irqs_disabled()); /* ZZZ debug */ + + local_irq_disable(); + pgdp = pgd_offset(vma->vm_mm, vaddr); + if (unlikely(pgd_none(*pgdp))) + goto err; + + pudp = pud_offset(pgdp, vaddr); + if (unlikely(pud_none(*pudp))) + goto err; + + pmdp = pmd_offset(pudp, vaddr); + if (unlikely(pmd_none(*pmdp))) + goto err; +#ifdef CONFIG_X86_64 + if (unlikely(pmd_large(*pmdp))) + pte = *(pte_t *) pmdp; + else +#endif + pte = *pte_offset_kernel(pmdp, vaddr); + + local_irq_enable(); + + if (unlikely(!pte_present(pte) || + (write && (!pte_write(pte) || !pte_dirty(pte))))) + return 1; + + *paddr = pte_pfn(pte) << PAGE_SHIFT; + *pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT; + return 0; + +err: + local_irq_enable(); + return 1; +} + +/* + * Drop a TLB entry into the GRU. The fault is described by info in an TFH. + * Input: + * cb Address of user CBR. Null if not running in user context + * Return: + * 0 = dropin, exception, or switch to UPM successful + * 1 = range invalidate active + * < 0 = error code + * + */ +static int gru_try_dropin(struct gru_thread_state *gts, + struct gru_tlb_fault_handle *tfh, + unsigned long __user *cb) +{ + struct mm_struct *mm = gts->ts_mm; + struct vm_area_struct *vma; + int pageshift, asid, write, ret; + unsigned long paddr, gpa, vaddr; + + /* + * NOTE: The GRU contains magic hardware that eliminates races between + * TLB invalidates and TLB dropins. If an invalidate occurs + * in the window between reading the TFH and the subsequent TLB dropin, + * the dropin is ignored. This eliminates the need for additional locks. + */ + + /* + * Error if TFH state is IDLE or FMM mode & the user issuing a UPM call. + * Might be a hardware race OR a stupid user. Ignore FMM because FMM + * is a transient state. + */ + if (tfh->state == TFHSTATE_IDLE) + goto failidle; + if (tfh->state == TFHSTATE_MISS_FMM && cb) + goto failfmm; + + write = (tfh->cause & TFHCAUSE_TLB_MOD) != 0; + vaddr = tfh->missvaddr; + asid = tfh->missasid; + if (asid == 0) + goto failnoasid; + + rmb(); /* TFH must be cache resident before reading ms_range_active */ + + /* + * TFH is cache resident - at least briefly. Fail the dropin + * if a range invalidate is active. + */ + if (atomic_read(>s->ts_gms->ms_range_active)) + goto failactive; + + vma = find_vma(mm, vaddr); + if (!vma) + goto failinval; + + /* + * Atomic lookup is faster & usually works even if called in non-atomic + * context. + */ + ret = atomic_pte_lookup(vma, vaddr, write, &paddr, &pageshift); + if (ret) { + if (!cb) + goto failupm; + if (non_atomic_pte_lookup(vma, vaddr, write, &paddr, + &pageshift)) + goto failinval; + } + if (is_gru_paddr(paddr)) + goto failinval; + + paddr = paddr & ~((1UL << pageshift) - 1); + gpa = uv_soc_phys_ram_to_gpa(paddr); + gru_cb_set_istatus_active(cb); + tfh_write_restart(tfh, gpa, GAA_RAM, vaddr, asid, write, + GRU_PAGESIZE(pageshift)); + STAT(tlb_dropin); + gru_dbg(grudev, + "%s: tfh 0x%p, vaddr 0x%lx, asid 0x%x, ps %d, gpa 0x%lx\n", + ret ? "non-atomic" : "atomic", tfh, vaddr, asid, + pageshift, gpa); + return 0; + +failnoasid: + /* No asid (delayed unload). */ + STAT(tlb_dropin_fail_no_asid); + gru_dbg(grudev, "FAILED no_asid tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr); + if (!cb) + tfh_user_polling_mode(tfh); + else + gru_flush_cache(tfh); + return -EAGAIN; + +failupm: + /* Atomic failure switch CBR to UPM */ + tfh_user_polling_mode(tfh); + STAT(tlb_dropin_fail_upm); + gru_dbg(grudev, "FAILED upm tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr); + return 1; + +failfmm: + /* FMM state on UPM call */ + STAT(tlb_dropin_fail_fmm); + gru_dbg(grudev, "FAILED fmm tfh: 0x%p, state %d\n", tfh, tfh->state); + return 0; + +failidle: + /* TFH was idle - no miss pending */ + gru_flush_cache(tfh); + if (cb) + gru_flush_cache(cb); + STAT(tlb_dropin_fail_idle); + gru_dbg(grudev, "FAILED idle tfh: 0x%p, state %d\n", tfh, tfh->state); + return 0; + +failinval: + /* All errors (atomic & non-atomic) switch CBR to EXCEPTION state */ + tfh_exception(tfh); + STAT(tlb_dropin_fail_invalid); + gru_dbg(grudev, "FAILED inval tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr); + return -EFAULT; + +failactive: + /* Range invalidate active. Switch to UPM iff atomic */ + if (!cb) + tfh_user_polling_mode(tfh); + else + gru_flush_cache(tfh); + STAT(tlb_dropin_fail_range_active); + gru_dbg(grudev, "FAILED range active: tfh 0x%p, vaddr 0x%lx\n", + tfh, vaddr); + return 1; +} + +/* + * Process an external interrupt from the GRU. This interrupt is + * caused by a TLB miss. + * Note that this is the interrupt handler that is registered with linux + * interrupt handlers. + */ +irqreturn_t gru_intr(int irq, void *dev_id) +{ + struct gru_state *gru; + struct gru_tlb_fault_map map; + struct gru_thread_state *gts; + struct gru_tlb_fault_handle *tfh = NULL; + int cbrnum, ctxnum; + + STAT(intr); + + gru = irq_to_gru(irq); + if (!gru) { + dev_err(grudev, "GRU: invalid interrupt: cpu %d, irq %d\n", + raw_smp_processor_id(), irq); + return IRQ_NONE; + } + get_clear_fault_map(gru, &map); + gru_dbg(grudev, "irq %d, gru %x, map 0x%lx\n", irq, gru->gs_gid, + map.fault_bits[0]); + + for_each_cbr_in_tfm(cbrnum, map.fault_bits) { + tfh = get_tfh_by_index(gru, cbrnum); + prefetchw(tfh); /* Helps on hdw, required for emulator */ + + /* + * When hardware sets a bit in the faultmap, it implicitly + * locks the GRU context so that it cannot be unloaded. + * The gts cannot change until a TFH start/writestart command + * is issued. + */ + ctxnum = tfh->ctxnum; + gts = gru->gs_gts[ctxnum]; + + /* + * This is running in interrupt context. Trylock the mmap_sem. + * If it fails, retry the fault in user context. + */ + if (down_read_trylock(>s->ts_mm->mmap_sem)) { + gru_try_dropin(gts, tfh, NULL); + up_read(>s->ts_mm->mmap_sem); + } else { + tfh_user_polling_mode(tfh); + } + } + return IRQ_HANDLED; +} + + +static int gru_user_dropin(struct gru_thread_state *gts, + struct gru_tlb_fault_handle *tfh, + unsigned long __user *cb) +{ + struct gru_mm_struct *gms = gts->ts_gms; + int ret; + + while (1) { + wait_event(gms->ms_wait_queue, + atomic_read(&gms->ms_range_active) == 0); + prefetchw(tfh); /* Helps on hdw, required for emulator */ + ret = gru_try_dropin(gts, tfh, cb); + if (ret <= 0) + return ret; + STAT(call_os_wait_queue); + } +} + +/* + * This interface is called as a result of a user detecting a "call OS" bit + * in a user CB. Normally means that a TLB fault has occurred. + * cb - user virtual address of the CB + */ +int gru_handle_user_call_os(unsigned long cb) +{ + struct gru_tlb_fault_handle *tfh; + struct gru_thread_state *gts; + unsigned long __user *cbp; + int ucbnum, cbrnum, ret = -EINVAL; + + STAT(call_os); + gru_dbg(grudev, "address 0x%lx\n", cb); + + /* sanity check the cb pointer */ + ucbnum = get_cb_number((void *)cb); + if ((cb & (GRU_HANDLE_STRIDE - 1)) || ucbnum >= GRU_NUM_CB) + return -EINVAL; + cbp = (unsigned long *)cb; + + gts = gru_find_lock_gts(cb); + if (!gts) + return -EINVAL; + + if (ucbnum >= gts->ts_cbr_au_count * GRU_CBR_AU_SIZE) { + ret = -EINVAL; + goto exit; + } + + /* + * If force_unload is set, the UPM TLB fault is phony. The task + * has migrated to another node and the GSEG must be moved. Just + * unload the context. The task will page fault and assign a new + * context. + */ + ret = -EAGAIN; + cbrnum = thread_cbr_number(gts, ucbnum); + if (gts->ts_force_unload) { + gru_unload_context(gts, 1); + } else if (gts->ts_gru) { + tfh = get_tfh_by_index(gts->ts_gru, cbrnum); + ret = gru_user_dropin(gts, tfh, cbp); + } +exit: + gru_unlock_gts(gts); + return ret; +} + +/* + * Fetch the exception detail information for a CB that terminated with + * an exception. + */ +int gru_get_exception_detail(unsigned long arg) +{ + struct control_block_extended_exc_detail excdet; + struct gru_control_block_extended *cbe; + struct gru_thread_state *gts; + int ucbnum, cbrnum, ret; + + STAT(user_exception); + if (copy_from_user(&excdet, (void __user *)arg, sizeof(excdet))) + return -EFAULT; + + gru_dbg(grudev, "address 0x%lx\n", excdet.cb); + gts = gru_find_lock_gts(excdet.cb); + if (!gts) + return -EINVAL; + + if (gts->ts_gru) { + ucbnum = get_cb_number((void *)excdet.cb); + cbrnum = thread_cbr_number(gts, ucbnum); + cbe = get_cbe_by_index(gts->ts_gru, cbrnum); + excdet.opc = cbe->opccpy; + excdet.exopc = cbe->exopccpy; + excdet.ecause = cbe->ecause; + excdet.exceptdet0 = cbe->idef1upd; + excdet.exceptdet1 = cbe->idef3upd; + ret = 0; + } else { + ret = -EAGAIN; + } + gru_unlock_gts(gts); + + gru_dbg(grudev, "address 0x%lx, ecause 0x%x\n", excdet.cb, + excdet.ecause); + if (!ret && copy_to_user((void __user *)arg, &excdet, sizeof(excdet))) + ret = -EFAULT; + return ret; +} + +/* + * User request to unload a context. Content is saved for possible reload. + */ +int gru_user_unload_context(unsigned long arg) +{ + struct gru_thread_state *gts; + struct gru_unload_context_req req; + + STAT(user_unload_context); + if (copy_from_user(&req, (void __user *)arg, sizeof(req))) + return -EFAULT; + + gru_dbg(grudev, "gseg 0x%lx\n", req.gseg); + + gts = gru_find_lock_gts(req.gseg); + if (!gts) + return -EINVAL; + + if (gts->ts_gru) + gru_unload_context(gts, 1); + gru_unlock_gts(gts); + + return 0; +} + +/* + * User request to flush a range of virtual addresses from the GRU TLB + * (Mainly for testing). + */ +int gru_user_flush_tlb(unsigned long arg) +{ + struct gru_thread_state *gts; + struct gru_flush_tlb_req req; + + STAT(user_flush_tlb); + if (copy_from_user(&req, (void __user *)arg, sizeof(req))) + return -EFAULT; + + gru_dbg(grudev, "gseg 0x%lx, vaddr 0x%lx, len 0x%lx\n", req.gseg, + req.vaddr, req.len); + + gts = gru_find_lock_gts(req.gseg); + if (!gts) + return -EINVAL; + + gru_flush_tlb_range(gts->ts_gms, req.vaddr, req.vaddr + req.len); + gru_unlock_gts(gts); + + return 0; +} + +/* + * Register the current task as the user of the GSEG slice. + * Needed for TLB fault interrupt targeting. + */ +int gru_set_task_slice(long address) +{ + struct gru_thread_state *gts; + + STAT(set_task_slice); + gru_dbg(grudev, "address 0x%lx\n", address); + gts = gru_alloc_locked_gts(address); + if (!gts) + return -EINVAL; + + gts->ts_tgid_owner = current->tgid; + gru_unlock_gts(gts); + + return 0; +} diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c new file mode 100644 index 00000000000..23c91f5f6b6 --- /dev/null +++ b/drivers/misc/sgi-gru/grufile.c @@ -0,0 +1,485 @@ +/* + * SN Platform GRU Driver + * + * FILE OPERATIONS & DRIVER INITIALIZATION + * + * This file supports the user system call for file open, close, mmap, etc. + * This also incudes the driver initialization code. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/io.h> +#include <linux/smp_lock.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/miscdevice.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/uaccess.h> +#include "gru.h" +#include "grulib.h" +#include "grutables.h" + +#if defined CONFIG_X86_64 +#include <asm/genapic.h> +#include <asm/irq.h> +#define IS_UV() is_uv_system() +#elif defined CONFIG_IA64 +#include <asm/system.h> +#include <asm/sn/simulator.h> +/* temp support for running on hardware simulator */ +#define IS_UV() IS_MEDUSA() || ia64_platform_is("uv") +#else +#define IS_UV() 0 +#endif + +#include <asm/uv/uv_hub.h> +#include <asm/uv/uv_mmrs.h> + +struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly; +unsigned long gru_start_paddr, gru_end_paddr __read_mostly; +struct gru_stats_s gru_stats; + +/* Guaranteed user available resources on each node */ +static int max_user_cbrs, max_user_dsr_bytes; + +static struct file_operations gru_fops; +static struct miscdevice gru_miscdev; + + +/* + * gru_vma_close + * + * Called when unmapping a device mapping. Frees all gru resources + * and tables belonging to the vma. + */ +static void gru_vma_close(struct vm_area_struct *vma) +{ + struct gru_vma_data *vdata; + struct gru_thread_state *gts; + struct list_head *entry, *next; + + if (!vma->vm_private_data) + return; + + vdata = vma->vm_private_data; + vma->vm_private_data = NULL; + gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file, + vdata); + list_for_each_safe(entry, next, &vdata->vd_head) { + gts = + list_entry(entry, struct gru_thread_state, ts_next); + list_del(>s->ts_next); + mutex_lock(>s->ts_ctxlock); + if (gts->ts_gru) + gru_unload_context(gts, 0); + mutex_unlock(>s->ts_ctxlock); + gts_drop(gts); + } + kfree(vdata); + STAT(vdata_free); +} + +/* + * gru_file_mmap + * + * Called when mmaping the device. Initializes the vma with a fault handler + * and private data structure necessary to allocate, track, and free the + * underlying pages. + */ +static int gru_file_mmap(struct file *file, struct vm_area_struct *vma) +{ + if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE)) + return -EPERM; + + if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) || + vma->vm_end & (GRU_GSEG_PAGESIZE - 1)) + return -EINVAL; + + vma->vm_flags |= + (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP | + VM_RESERVED); + vma->vm_page_prot = PAGE_SHARED; + vma->vm_ops = &gru_vm_ops; + + vma->vm_private_data = gru_alloc_vma_data(vma, 0); + if (!vma->vm_private_data) + return -ENOMEM; + + gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n", + file, vma->vm_start, vma, vma->vm_private_data); + return 0; +} + +/* + * Create a new GRU context + */ +static int gru_create_new_context(unsigned long arg) +{ + struct gru_create_context_req req; + struct vm_area_struct *vma; + struct gru_vma_data *vdata; + int ret = -EINVAL; + + + if (copy_from_user(&req, (void __user *)arg, sizeof(req))) + return -EFAULT; + + if (req.data_segment_bytes == 0 || + req.data_segment_bytes > max_user_dsr_bytes) + return -EINVAL; + if (!req.control_blocks || !req.maximum_thread_count || + req.control_blocks > max_user_cbrs) + return -EINVAL; + + if (!(req.options & GRU_OPT_MISS_MASK)) + req.options |= GRU_OPT_MISS_FMM_INTR; + + down_write(¤t->mm->mmap_sem); + vma = gru_find_vma(req.gseg); + if (vma) { + vdata = vma->vm_private_data; + vdata->vd_user_options = req.options; + vdata->vd_dsr_au_count = + GRU_DS_BYTES_TO_AU(req.data_segment_bytes); + vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks); + ret = 0; + } + up_write(¤t->mm->mmap_sem); + + return ret; +} + +/* + * Get GRU configuration info (temp - for emulator testing) + */ +static long gru_get_config_info(unsigned long arg) +{ + struct gru_config_info info; + int nodesperblade; + + if (num_online_nodes() > 1 && + (uv_node_to_blade_id(1) == uv_node_to_blade_id(0))) + nodesperblade = 2; + else + nodesperblade = 1; + info.cpus = num_online_cpus(); + info.nodes = num_online_nodes(); + info.blades = info.nodes / nodesperblade; + info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades; + + if (copy_to_user((void __user *)arg, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +/* + * Get GRU chiplet status + */ +static long gru_get_chiplet_status(unsigned long arg) +{ + struct gru_state *gru; + struct gru_chiplet_info info; + + if (copy_from_user(&info, (void __user *)arg, sizeof(info))) + return -EFAULT; + + if (info.node == -1) + info.node = numa_node_id(); + if (info.node >= num_possible_nodes() || + info.chiplet >= GRU_CHIPLETS_PER_HUB || + info.node < 0 || info.chiplet < 0) + return -EINVAL; + + info.blade = uv_node_to_blade_id(info.node); + gru = get_gru(info.blade, info.chiplet); + + info.total_dsr_bytes = GRU_NUM_DSR_BYTES; + info.total_cbr = GRU_NUM_CB; + info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES - + gru->gs_reserved_dsr_bytes; + info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs; + info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) * + GRU_DSR_AU_BYTES; + info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; + + if (copy_to_user((void __user *)arg, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +/* + * gru_file_unlocked_ioctl + * + * Called to update file attributes via IOCTL calls. + */ +static long gru_file_unlocked_ioctl(struct file *file, unsigned int req, + unsigned long arg) +{ + int err = -EBADRQC; + + gru_dbg(grudev, "file %p\n", file); + + switch (req) { + case GRU_CREATE_CONTEXT: + err = gru_create_new_context(arg); + break; + case GRU_SET_TASK_SLICE: + err = gru_set_task_slice(arg); + break; + case GRU_USER_GET_EXCEPTION_DETAIL: + err = gru_get_exception_detail(arg); + break; + case GRU_USER_UNLOAD_CONTEXT: + err = gru_user_unload_context(arg); + break; + case GRU_GET_CHIPLET_STATUS: + err = gru_get_chiplet_status(arg); + break; + case GRU_USER_FLUSH_TLB: + err = gru_user_flush_tlb(arg); + break; + case GRU_USER_CALL_OS: + err = gru_handle_user_call_os(arg); + break; + case GRU_GET_CONFIG_INFO: + err = gru_get_config_info(arg); + break; + } + return err; +} + +/* + * Called at init time to build tables for all GRUs that are present in the + * system. + */ +static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr, + void *vaddr, int nid, int bid, int grunum) +{ + spin_lock_init(&gru->gs_lock); + spin_lock_init(&gru->gs_asid_lock); + gru->gs_gru_base_paddr = paddr; + gru->gs_gru_base_vaddr = vaddr; + gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum; + gru->gs_blade = gru_base[bid]; + gru->gs_blade_id = bid; + gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1; + gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1; + gru_tgh_flush_init(gru); + gru_dbg(grudev, "bid %d, nid %d, gru %x, vaddr %p (0x%lx)\n", + bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr, + gru->gs_gru_base_paddr); + gru_kservices_init(gru); +} + +static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr) +{ + int pnode, nid, bid, chip; + int cbrs, dsrbytes, n; + int order = get_order(sizeof(struct gru_blade_state)); + struct page *page; + struct gru_state *gru; + unsigned long paddr; + void *vaddr; + + max_user_cbrs = GRU_NUM_CB; + max_user_dsr_bytes = GRU_NUM_DSR_BYTES; + for_each_online_node(nid) { + bid = uv_node_to_blade_id(nid); + pnode = uv_node_to_pnode(nid); + if (gru_base[bid]) + continue; + page = alloc_pages_node(nid, GFP_KERNEL, order); + if (!page) + goto fail; + gru_base[bid] = page_address(page); + memset(gru_base[bid], 0, sizeof(struct gru_blade_state)); + gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0]; + spin_lock_init(&gru_base[bid]->bs_lock); + + dsrbytes = 0; + cbrs = 0; + for (gru = gru_base[bid]->bs_grus, chip = 0; + chip < GRU_CHIPLETS_PER_BLADE; + chip++, gru++) { + paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip); + vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip); + gru_init_chiplet(gru, paddr, vaddr, bid, nid, chip); + n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; + cbrs = max(cbrs, n); + n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; + dsrbytes = max(dsrbytes, n); + } + max_user_cbrs = min(max_user_cbrs, cbrs); + max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes); + } + + return 0; + +fail: + for (nid--; nid >= 0; nid--) + free_pages((unsigned long)gru_base[nid], order); + return -ENOMEM; +} + +#ifdef CONFIG_IA64 + +static int get_base_irq(void) +{ + return IRQ_GRU; +} + +#elif defined CONFIG_X86_64 + +static void noop(unsigned int irq) +{ +} + +static struct irq_chip gru_chip = { + .name = "gru", + .mask = noop, + .unmask = noop, + .ack = noop, +}; + +static int get_base_irq(void) +{ + set_irq_chip(IRQ_GRU, &gru_chip); + set_irq_chip(IRQ_GRU + 1, &gru_chip); + return IRQ_GRU; +} +#endif + +/* + * gru_init + * + * Called at boot or module load time to initialize the GRUs. + */ +static int __init gru_init(void) +{ + int ret, irq, chip; + char id[10]; + void *gru_start_vaddr; + + if (!IS_UV()) + return 0; + +#if defined CONFIG_IA64 + gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */ +#else + gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) & + 0x7fffffffffffUL; + +#endif + gru_start_vaddr = __va(gru_start_paddr); + gru_end_paddr = gru_start_paddr + MAX_NUMNODES * GRU_SIZE; + printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", + gru_start_paddr, gru_end_paddr); + irq = get_base_irq(); + for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) { + ret = request_irq(irq + chip, gru_intr, 0, id, NULL); + if (ret) { + printk(KERN_ERR "%s: request_irq failed\n", + GRU_DRIVER_ID_STR); + goto exit1; + } + } + + ret = misc_register(&gru_miscdev); + if (ret) { + printk(KERN_ERR "%s: misc_register failed\n", + GRU_DRIVER_ID_STR); + goto exit1; + } + + ret = gru_proc_init(); + if (ret) { + printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR); + goto exit2; + } + + ret = gru_init_tables(gru_start_paddr, gru_start_vaddr); + if (ret) { + printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR); + goto exit3; + } + + printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR, + GRU_DRIVER_VERSION_STR); + return 0; + +exit3: + gru_proc_exit(); +exit2: + misc_deregister(&gru_miscdev); +exit1: + for (--chip; chip >= 0; chip--) + free_irq(irq + chip, NULL); + return ret; + +} + +static void __exit gru_exit(void) +{ + int i, bid; + int order = get_order(sizeof(struct gru_state) * + GRU_CHIPLETS_PER_BLADE); + + for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++) + free_irq(IRQ_GRU + i, NULL); + + for (bid = 0; bid < GRU_MAX_BLADES; bid++) + free_pages((unsigned long)gru_base[bid], order); + + misc_deregister(&gru_miscdev); + gru_proc_exit(); +} + +static struct file_operations gru_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = gru_file_unlocked_ioctl, + .mmap = gru_file_mmap, +}; + +static struct miscdevice gru_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "gru", + .fops = &gru_fops, +}; + +struct vm_operations_struct gru_vm_ops = { + .close = gru_vma_close, + .fault = gru_fault, +}; + +module_init(gru_init); +module_exit(gru_exit); + +module_param(gru_options, ulong, 0644); +MODULE_PARM_DESC(gru_options, "Various debug options"); + +MODULE_AUTHOR("Silicon Graphics, Inc."); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR); +MODULE_VERSION(GRU_DRIVER_VERSION_STR); + diff --git a/drivers/misc/sgi-gru/gruhandles.h b/drivers/misc/sgi-gru/gruhandles.h new file mode 100644 index 00000000000..d16031d6267 --- /dev/null +++ b/drivers/misc/sgi-gru/gruhandles.h @@ -0,0 +1,663 @@ +/* + * SN Platform GRU Driver + * + * GRU HANDLE DEFINITION + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __GRUHANDLES_H__ +#define __GRUHANDLES_H__ +#include "gru_instructions.h" + +/* + * Manifest constants for GRU Memory Map + */ +#define GRU_GSEG0_BASE 0 +#define GRU_MCS_BASE (64 * 1024 * 1024) +#define GRU_SIZE (128UL * 1024 * 1024) + +/* Handle & resource counts */ +#define GRU_NUM_CB 128 +#define GRU_NUM_DSR_BYTES (32 * 1024) +#define GRU_NUM_TFM 16 +#define GRU_NUM_TGH 24 +#define GRU_NUM_CBE 128 +#define GRU_NUM_TFH 128 +#define GRU_NUM_CCH 16 +#define GRU_NUM_GSH 1 + +/* Maximum resource counts that can be reserved by user programs */ +#define GRU_NUM_USER_CBR GRU_NUM_CBE +#define GRU_NUM_USER_DSR_BYTES GRU_NUM_DSR_BYTES + +/* Bytes per handle & handle stride. Code assumes all cb, tfh, cbe handles + * are the same */ +#define GRU_HANDLE_BYTES 64 +#define GRU_HANDLE_STRIDE 256 + +/* Base addresses of handles */ +#define GRU_TFM_BASE (GRU_MCS_BASE + 0x00000) +#define GRU_TGH_BASE (GRU_MCS_BASE + 0x08000) +#define GRU_CBE_BASE (GRU_MCS_BASE + 0x10000) +#define GRU_TFH_BASE (GRU_MCS_BASE + 0x18000) +#define GRU_CCH_BASE (GRU_MCS_BASE + 0x20000) +#define GRU_GSH_BASE (GRU_MCS_BASE + 0x30000) + +/* User gseg constants */ +#define GRU_GSEG_STRIDE (4 * 1024 * 1024) +#define GSEG_BASE(a) ((a) & ~(GRU_GSEG_PAGESIZE - 1)) + +/* Data segment constants */ +#define GRU_DSR_AU_BYTES 1024 +#define GRU_DSR_CL (GRU_NUM_DSR_BYTES / GRU_CACHE_LINE_BYTES) +#define GRU_DSR_AU_CL (GRU_DSR_AU_BYTES / GRU_CACHE_LINE_BYTES) +#define GRU_DSR_AU (GRU_NUM_DSR_BYTES / GRU_DSR_AU_BYTES) + +/* Control block constants */ +#define GRU_CBR_AU_SIZE 2 +#define GRU_CBR_AU (GRU_NUM_CBE / GRU_CBR_AU_SIZE) + +/* Convert resource counts to the number of AU */ +#define GRU_DS_BYTES_TO_AU(n) DIV_ROUND_UP(n, GRU_DSR_AU_BYTES) +#define GRU_CB_COUNT_TO_AU(n) DIV_ROUND_UP(n, GRU_CBR_AU_SIZE) + +/* UV limits */ +#define GRU_CHIPLETS_PER_HUB 2 +#define GRU_HUBS_PER_BLADE 1 +#define GRU_CHIPLETS_PER_BLADE (GRU_HUBS_PER_BLADE * GRU_CHIPLETS_PER_HUB) + +/* User GRU Gseg offsets */ +#define GRU_CB_BASE 0 +#define GRU_CB_LIMIT (GRU_CB_BASE + GRU_HANDLE_STRIDE * GRU_NUM_CBE) +#define GRU_DS_BASE 0x20000 +#define GRU_DS_LIMIT (GRU_DS_BASE + GRU_NUM_DSR_BYTES) + +/* Convert a GRU physical address to the chiplet offset */ +#define GSEGPOFF(h) ((h) & (GRU_SIZE - 1)) + +/* Convert an arbitrary handle address to the beginning of the GRU segment */ +#ifndef __PLUGIN__ +#define GRUBASE(h) ((void *)((unsigned long)(h) & ~(GRU_SIZE - 1))) +#else +extern void *gmu_grubase(void *h); +#define GRUBASE(h) gmu_grubase(h) +#endif + +/* General addressing macros. */ +static inline void *get_gseg_base_address(void *base, int ctxnum) +{ + return (void *)(base + GRU_GSEG0_BASE + GRU_GSEG_STRIDE * ctxnum); +} + +static inline void *get_gseg_base_address_cb(void *base, int ctxnum, int line) +{ + return (void *)(get_gseg_base_address(base, ctxnum) + + GRU_CB_BASE + GRU_HANDLE_STRIDE * line); +} + +static inline void *get_gseg_base_address_ds(void *base, int ctxnum, int line) +{ + return (void *)(get_gseg_base_address(base, ctxnum) + GRU_DS_BASE + + GRU_CACHE_LINE_BYTES * line); +} + +static inline struct gru_tlb_fault_map *get_tfm(void *base, int ctxnum) +{ + return (struct gru_tlb_fault_map *)(base + GRU_TFM_BASE + + ctxnum * GRU_HANDLE_STRIDE); +} + +static inline struct gru_tlb_global_handle *get_tgh(void *base, int ctxnum) +{ + return (struct gru_tlb_global_handle *)(base + GRU_TGH_BASE + + ctxnum * GRU_HANDLE_STRIDE); +} + +static inline struct gru_control_block_extended *get_cbe(void *base, int ctxnum) +{ + return (struct gru_control_block_extended *)(base + GRU_CBE_BASE + + ctxnum * GRU_HANDLE_STRIDE); +} + +static inline struct gru_tlb_fault_handle *get_tfh(void *base, int ctxnum) +{ + return (struct gru_tlb_fault_handle *)(base + GRU_TFH_BASE + + ctxnum * GRU_HANDLE_STRIDE); +} + +static inline struct gru_context_configuration_handle *get_cch(void *base, + int ctxnum) +{ + return (struct gru_context_configuration_handle *)(base + + GRU_CCH_BASE + ctxnum * GRU_HANDLE_STRIDE); +} + +static inline unsigned long get_cb_number(void *cb) +{ + return (((unsigned long)cb - GRU_CB_BASE) % GRU_GSEG_PAGESIZE) / + GRU_HANDLE_STRIDE; +} + +/* byte offset to a specific GRU chiplet. (p=pnode, c=chiplet (0 or 1)*/ +static inline unsigned long gru_chiplet_paddr(unsigned long paddr, int pnode, + int chiplet) +{ + return paddr + GRU_SIZE * (2 * pnode + chiplet); +} + +static inline void *gru_chiplet_vaddr(void *vaddr, int pnode, int chiplet) +{ + return vaddr + GRU_SIZE * (2 * pnode + chiplet); +} + + + +/* + * Global TLB Fault Map + * Bitmap of outstanding TLB misses needing interrupt/polling service. + * + */ +struct gru_tlb_fault_map { + unsigned long fault_bits[BITS_TO_LONGS(GRU_NUM_CBE)]; + unsigned long fill0[2]; + unsigned long done_bits[BITS_TO_LONGS(GRU_NUM_CBE)]; + unsigned long fill1[2]; +}; + +/* + * TGH - TLB Global Handle + * Used for TLB flushing. + * + */ +struct gru_tlb_global_handle { + unsigned int cmd:1; /* DW 0 */ + unsigned int delresp:1; + unsigned int opc:1; + unsigned int fill1:5; + + unsigned int fill2:8; + + unsigned int status:2; + unsigned long fill3:2; + unsigned int state:3; + unsigned long fill4:1; + + unsigned int cause:3; + unsigned long fill5:37; + + unsigned long vaddr:64; /* DW 1 */ + + unsigned int asid:24; /* DW 2 */ + unsigned int fill6:8; + + unsigned int pagesize:5; + unsigned int fill7:11; + + unsigned int global:1; + unsigned int fill8:15; + + unsigned long vaddrmask:39; /* DW 3 */ + unsigned int fill9:9; + unsigned int n:10; + unsigned int fill10:6; + + unsigned int ctxbitmap:16; /* DW4 */ + unsigned long fill11[3]; +}; + +enum gru_tgh_cmd { + TGHCMD_START +}; + +enum gru_tgh_opc { + TGHOP_TLBNOP, + TGHOP_TLBINV +}; + +enum gru_tgh_status { + TGHSTATUS_IDLE, + TGHSTATUS_EXCEPTION, + TGHSTATUS_ACTIVE +}; + +enum gru_tgh_state { + TGHSTATE_IDLE, + TGHSTATE_PE_INVAL, + TGHSTATE_INTERRUPT_INVAL, + TGHSTATE_WAITDONE, + TGHSTATE_RESTART_CTX, +}; + +/* + * TFH - TLB Global Handle + * Used for TLB dropins into the GRU TLB. + * + */ +struct gru_tlb_fault_handle { + unsigned int cmd:1; /* DW 0 - low 32*/ + unsigned int delresp:1; + unsigned int fill0:2; + unsigned int opc:3; + unsigned int fill1:9; + + unsigned int status:2; + unsigned int fill2:1; + unsigned int color:1; + unsigned int state:3; + unsigned int fill3:1; + + unsigned int cause:7; /* DW 0 - high 32 */ + unsigned int fill4:1; + + unsigned int indexway:12; + unsigned int fill5:4; + + unsigned int ctxnum:4; + unsigned int fill6:12; + + unsigned long missvaddr:64; /* DW 1 */ + + unsigned int missasid:24; /* DW 2 */ + unsigned int fill7:8; + unsigned int fillasid:24; + unsigned int dirty:1; + unsigned int gaa:2; + unsigned long fill8:5; + + unsigned long pfn:41; /* DW 3 */ + unsigned int fill9:7; + unsigned int pagesize:5; + unsigned int fill10:11; + + unsigned long fillvaddr:64; /* DW 4 */ + + unsigned long fill11[3]; +}; + +enum gru_tfh_opc { + TFHOP_NOOP, + TFHOP_RESTART, + TFHOP_WRITE_ONLY, + TFHOP_WRITE_RESTART, + TFHOP_EXCEPTION, + TFHOP_USER_POLLING_MODE = 7, +}; + +enum tfh_status { + TFHSTATUS_IDLE, + TFHSTATUS_EXCEPTION, + TFHSTATUS_ACTIVE, +}; + +enum tfh_state { + TFHSTATE_INACTIVE, + TFHSTATE_IDLE, + TFHSTATE_MISS_UPM, + TFHSTATE_MISS_FMM, + TFHSTATE_HW_ERR, + TFHSTATE_WRITE_TLB, + TFHSTATE_RESTART_CBR, +}; + +/* TFH cause bits */ +enum tfh_cause { + TFHCAUSE_NONE, + TFHCAUSE_TLB_MISS, + TFHCAUSE_TLB_MOD, + TFHCAUSE_HW_ERROR_RR, + TFHCAUSE_HW_ERROR_MAIN_ARRAY, + TFHCAUSE_HW_ERROR_VALID, + TFHCAUSE_HW_ERROR_PAGESIZE, + TFHCAUSE_INSTRUCTION_EXCEPTION, + TFHCAUSE_UNCORRECTIBLE_ERROR, +}; + +/* GAA values */ +#define GAA_RAM 0x0 +#define GAA_NCRAM 0x2 +#define GAA_MMIO 0x1 +#define GAA_REGISTER 0x3 + +/* GRU paddr shift for pfn. (NOTE: shift is NOT by actual pagesize) */ +#define GRU_PADDR_SHIFT 12 + +/* + * Context Configuration handle + * Used to allocate resources to a GSEG context. + * + */ +struct gru_context_configuration_handle { + unsigned int cmd:1; /* DW0 */ + unsigned int delresp:1; + unsigned int opc:3; + unsigned int unmap_enable:1; + unsigned int req_slice_set_enable:1; + unsigned int req_slice:2; + unsigned int cb_int_enable:1; + unsigned int tlb_int_enable:1; + unsigned int tfm_fault_bit_enable:1; + unsigned int tlb_int_select:4; + + unsigned int status:2; + unsigned int state:2; + unsigned int reserved2:4; + + unsigned int cause:4; + unsigned int tfm_done_bit_enable:1; + unsigned int unused:3; + + unsigned int dsr_allocation_map; + + unsigned long cbr_allocation_map; /* DW1 */ + + unsigned int asid[8]; /* DW 2 - 5 */ + unsigned short sizeavail[8]; /* DW 6 - 7 */ +} __attribute__ ((packed)); + +enum gru_cch_opc { + CCHOP_START = 1, + CCHOP_ALLOCATE, + CCHOP_INTERRUPT, + CCHOP_DEALLOCATE, + CCHOP_INTERRUPT_SYNC, +}; + +enum gru_cch_status { + CCHSTATUS_IDLE, + CCHSTATUS_EXCEPTION, + CCHSTATUS_ACTIVE, +}; + +enum gru_cch_state { + CCHSTATE_INACTIVE, + CCHSTATE_MAPPED, + CCHSTATE_ACTIVE, + CCHSTATE_INTERRUPTED, +}; + +/* CCH Exception cause */ +enum gru_cch_cause { + CCHCAUSE_REGION_REGISTER_WRITE_ERROR = 1, + CCHCAUSE_ILLEGAL_OPCODE = 2, + CCHCAUSE_INVALID_START_REQUEST = 3, + CCHCAUSE_INVALID_ALLOCATION_REQUEST = 4, + CCHCAUSE_INVALID_DEALLOCATION_REQUEST = 5, + CCHCAUSE_INVALID_INTERRUPT_REQUEST = 6, + CCHCAUSE_CCH_BUSY = 7, + CCHCAUSE_NO_CBRS_TO_ALLOCATE = 8, + CCHCAUSE_BAD_TFM_CONFIG = 9, + CCHCAUSE_CBR_RESOURCES_OVERSUBSCRIPED = 10, + CCHCAUSE_DSR_RESOURCES_OVERSUBSCRIPED = 11, + CCHCAUSE_CBR_DEALLOCATION_ERROR = 12, +}; +/* + * CBE - Control Block Extended + * Maintains internal GRU state for active CBs. + * + */ +struct gru_control_block_extended { + unsigned int reserved0:1; /* DW 0 - low */ + unsigned int imacpy:3; + unsigned int reserved1:4; + unsigned int xtypecpy:3; + unsigned int iaa0cpy:2; + unsigned int iaa1cpy:2; + unsigned int reserved2:1; + unsigned int opccpy:8; + unsigned int exopccpy:8; + + unsigned int idef2cpy:22; /* DW 0 - high */ + unsigned int reserved3:10; + + unsigned int idef4cpy:22; /* DW 1 */ + unsigned int reserved4:10; + unsigned int idef4upd:22; + unsigned int reserved5:10; + + unsigned long idef1upd:64; /* DW 2 */ + + unsigned long idef5cpy:64; /* DW 3 */ + + unsigned long idef6cpy:64; /* DW 4 */ + + unsigned long idef3upd:64; /* DW 5 */ + + unsigned long idef5upd:64; /* DW 6 */ + + unsigned int idef2upd:22; /* DW 7 */ + unsigned int reserved6:10; + + unsigned int ecause:20; + unsigned int cbrstate:4; + unsigned int cbrexecstatus:8; +}; + +enum gru_cbr_state { + CBRSTATE_INACTIVE, + CBRSTATE_IDLE, + CBRSTATE_PE_CHECK, + CBRSTATE_QUEUED, + CBRSTATE_WAIT_RESPONSE, + CBRSTATE_INTERRUPTED, + CBRSTATE_INTERRUPTED_MISS_FMM, + CBRSTATE_BUSY_INTERRUPT_MISS_FMM, + CBRSTATE_INTERRUPTED_MISS_UPM, + CBRSTATE_BUSY_INTERRUPTED_MISS_UPM, + CBRSTATE_REQUEST_ISSUE, + CBRSTATE_BUSY_INTERRUPT, +}; + +/* CBE cbrexecstatus bits */ +#define CBR_EXS_ABORT_OCC_BIT 0 +#define CBR_EXS_INT_OCC_BIT 1 +#define CBR_EXS_PENDING_BIT 2 +#define CBR_EXS_QUEUED_BIT 3 +#define CBR_EXS_TLBHW_BIT 4 +#define CBR_EXS_EXCEPTION_BIT 5 + +#define CBR_EXS_ABORT_OCC (1 << CBR_EXS_ABORT_OCC_BIT) +#define CBR_EXS_INT_OCC (1 << CBR_EXS_INT_OCC_BIT) +#define CBR_EXS_PENDING (1 << CBR_EXS_PENDING_BIT) +#define CBR_EXS_QUEUED (1 << CBR_EXS_QUEUED_BIT) +#define CBR_EXS_TLBHW (1 << CBR_EXS_TLBHW_BIT) +#define CBR_EXS_EXCEPTION (1 << CBR_EXS_EXCEPTION_BIT) + +/* CBE ecause bits - defined in gru_instructions.h */ + +/* + * Convert a processor pagesize into the strange encoded pagesize used by the + * GRU. Processor pagesize is encoded as log of bytes per page. (or PAGE_SHIFT) + * pagesize log pagesize grupagesize + * 4k 12 0 + * 16k 14 1 + * 64k 16 2 + * 256k 18 3 + * 1m 20 4 + * 2m 21 5 + * 4m 22 6 + * 16m 24 7 + * 64m 26 8 + * ... + */ +#define GRU_PAGESIZE(sh) ((((sh) > 20 ? (sh) + 2: (sh)) >> 1) - 6) +#define GRU_SIZEAVAIL(sh) (1UL << GRU_PAGESIZE(sh)) + +/* minimum TLB purge count to ensure a full purge */ +#define GRUMAXINVAL 1024UL + + +/* Extract the status field from a kernel handle */ +#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3) + +static inline void start_instruction(void *h) +{ + unsigned long *w0 = h; + + wmb(); /* setting CMD bit must be last */ + *w0 = *w0 | 1; + gru_flush_cache(h); +} + +static inline int wait_instruction_complete(void *h) +{ + int status; + + do { + cpu_relax(); + barrier(); + status = GET_MSEG_HANDLE_STATUS(h); + } while (status == CCHSTATUS_ACTIVE); + return status; +} + +#if defined CONFIG_IA64 +static inline void cch_allocate_set_asids( + struct gru_context_configuration_handle *cch, int asidval) +{ + int i; + + for (i = 0; i <= RGN_HPAGE; i++) { /* assume HPAGE is last region */ + cch->asid[i] = (asidval++); +#if 0 + /* ZZZ hugepages not supported yet */ + if (i == RGN_HPAGE) + cch->sizeavail[i] = GRU_SIZEAVAIL(hpage_shift); + else +#endif + cch->sizeavail[i] = GRU_SIZEAVAIL(PAGE_SHIFT); + } +} +#elif defined CONFIG_X86_64 +static inline void cch_allocate_set_asids( + struct gru_context_configuration_handle *cch, int asidval) +{ + int i; + + for (i = 0; i < 8; i++) { + cch->asid[i] = asidval++; + cch->sizeavail[i] = GRU_SIZEAVAIL(PAGE_SHIFT) | + GRU_SIZEAVAIL(21); + } +} +#endif + +static inline int cch_allocate(struct gru_context_configuration_handle *cch, + int asidval, unsigned long cbrmap, + unsigned long dsrmap) +{ + cch_allocate_set_asids(cch, asidval); + cch->dsr_allocation_map = dsrmap; + cch->cbr_allocation_map = cbrmap; + cch->opc = CCHOP_ALLOCATE; + start_instruction(cch); + return wait_instruction_complete(cch); +} + +static inline int cch_start(struct gru_context_configuration_handle *cch) +{ + cch->opc = CCHOP_START; + start_instruction(cch); + return wait_instruction_complete(cch); +} + +static inline int cch_interrupt(struct gru_context_configuration_handle *cch) +{ + cch->opc = CCHOP_INTERRUPT; + start_instruction(cch); + return wait_instruction_complete(cch); +} + +static inline int cch_deallocate(struct gru_context_configuration_handle *cch) +{ + cch->opc = CCHOP_DEALLOCATE; + start_instruction(cch); + return wait_instruction_complete(cch); +} + +static inline int cch_interrupt_sync(struct gru_context_configuration_handle + *cch) +{ + cch->opc = CCHOP_INTERRUPT_SYNC; + start_instruction(cch); + return wait_instruction_complete(cch); +} + +static inline int tgh_invalidate(struct gru_tlb_global_handle *tgh, + unsigned long vaddr, unsigned long vaddrmask, + int asid, int pagesize, int global, int n, + unsigned short ctxbitmap) +{ + tgh->vaddr = vaddr; + tgh->asid = asid; + tgh->pagesize = pagesize; + tgh->n = n; + tgh->global = global; + tgh->vaddrmask = vaddrmask; + tgh->ctxbitmap = ctxbitmap; + tgh->opc = TGHOP_TLBINV; + start_instruction(tgh); + return wait_instruction_complete(tgh); +} + +static inline void tfh_write_only(struct gru_tlb_fault_handle *tfh, + unsigned long pfn, unsigned long vaddr, + int asid, int dirty, int pagesize) +{ + tfh->fillasid = asid; + tfh->fillvaddr = vaddr; + tfh->pfn = pfn; + tfh->dirty = dirty; + tfh->pagesize = pagesize; + tfh->opc = TFHOP_WRITE_ONLY; + start_instruction(tfh); +} + +static inline void tfh_write_restart(struct gru_tlb_fault_handle *tfh, + unsigned long paddr, int gaa, + unsigned long vaddr, int asid, int dirty, + int pagesize) +{ + tfh->fillasid = asid; + tfh->fillvaddr = vaddr; + tfh->pfn = paddr >> GRU_PADDR_SHIFT; + tfh->gaa = gaa; + tfh->dirty = dirty; + tfh->pagesize = pagesize; + tfh->opc = TFHOP_WRITE_RESTART; + start_instruction(tfh); +} + +static inline void tfh_restart(struct gru_tlb_fault_handle *tfh) +{ + tfh->opc = TFHOP_RESTART; + start_instruction(tfh); +} + +static inline void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh) +{ + tfh->opc = TFHOP_USER_POLLING_MODE; + start_instruction(tfh); +} + +static inline void tfh_exception(struct gru_tlb_fault_handle *tfh) +{ + tfh->opc = TFHOP_EXCEPTION; + start_instruction(tfh); +} + +#endif /* __GRUHANDLES_H__ */ diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c new file mode 100644 index 00000000000..dfd49af0fe1 --- /dev/null +++ b/drivers/misc/sgi-gru/grukservices.c @@ -0,0 +1,679 @@ +/* + * SN Platform GRU Driver + * + * KERNEL SERVICES THAT USE THE GRU + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/smp_lock.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/miscdevice.h> +#include <linux/proc_fs.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include "gru.h" +#include "grulib.h" +#include "grutables.h" +#include "grukservices.h" +#include "gru_instructions.h" +#include <asm/uv/uv_hub.h> + +/* + * Kernel GRU Usage + * + * The following is an interim algorithm for management of kernel GRU + * resources. This will likely be replaced when we better understand the + * kernel/user requirements. + * + * At boot time, the kernel permanently reserves a fixed number of + * CBRs/DSRs for each cpu to use. The resources are all taken from + * the GRU chiplet 1 on the blade. This leaves the full set of resources + * of chiplet 0 available to be allocated to a single user. + */ + +/* Blade percpu resources PERMANENTLY reserved for kernel use */ +#define GRU_NUM_KERNEL_CBR 1 +#define GRU_NUM_KERNEL_DSR_BYTES 256 +#define KERNEL_CTXNUM 15 + +/* GRU instruction attributes for all instructions */ +#define IMA IMA_CB_DELAY + +/* GRU cacheline size is always 64 bytes - even on arches with 128 byte lines */ +#define __gru_cacheline_aligned__ \ + __attribute__((__aligned__(GRU_CACHE_LINE_BYTES))) + +#define MAGIC 0x1234567887654321UL + +/* Default retry count for GRU errors on kernel instructions */ +#define EXCEPTION_RETRY_LIMIT 3 + +/* Status of message queue sections */ +#define MQS_EMPTY 0 +#define MQS_FULL 1 +#define MQS_NOOP 2 + +/*----------------- RESOURCE MANAGEMENT -------------------------------------*/ +/* optimized for x86_64 */ +struct message_queue { + union gru_mesqhead head __gru_cacheline_aligned__; /* CL 0 */ + int qlines; /* DW 1 */ + long hstatus[2]; + void *next __gru_cacheline_aligned__;/* CL 1 */ + void *limit; + void *start; + void *start2; + char data ____cacheline_aligned; /* CL 2 */ +}; + +/* First word in every message - used by mesq interface */ +struct message_header { + char present; + char present2; + char lines; + char fill; +}; + +#define QLINES(mq) ((mq) + offsetof(struct message_queue, qlines)) +#define HSTATUS(mq, h) ((mq) + offsetof(struct message_queue, hstatus[h])) + +static int gru_get_cpu_resources(int dsr_bytes, void **cb, void **dsr) +{ + struct gru_blade_state *bs; + int lcpu; + + BUG_ON(dsr_bytes > GRU_NUM_KERNEL_DSR_BYTES); + preempt_disable(); + bs = gru_base[uv_numa_blade_id()]; + lcpu = uv_blade_processor_id(); + *cb = bs->kernel_cb + lcpu * GRU_HANDLE_STRIDE; + *dsr = bs->kernel_dsr + lcpu * GRU_NUM_KERNEL_DSR_BYTES; + return 0; +} + +static void gru_free_cpu_resources(void *cb, void *dsr) +{ + preempt_enable(); +} + +int gru_get_cb_exception_detail(void *cb, + struct control_block_extended_exc_detail *excdet) +{ + struct gru_control_block_extended *cbe; + + cbe = get_cbe(GRUBASE(cb), get_cb_number(cb)); + excdet->opc = cbe->opccpy; + excdet->exopc = cbe->exopccpy; + excdet->ecause = cbe->ecause; + excdet->exceptdet0 = cbe->idef1upd; + excdet->exceptdet1 = cbe->idef3upd; + return 0; +} + +char *gru_get_cb_exception_detail_str(int ret, void *cb, + char *buf, int size) +{ + struct gru_control_block_status *gen = (void *)cb; + struct control_block_extended_exc_detail excdet; + + if (ret > 0 && gen->istatus == CBS_EXCEPTION) { + gru_get_cb_exception_detail(cb, &excdet); + snprintf(buf, size, + "GRU exception: cb %p, opc %d, exopc %d, ecause 0x%x," + "excdet0 0x%lx, excdet1 0x%x", + gen, excdet.opc, excdet.exopc, excdet.ecause, + excdet.exceptdet0, excdet.exceptdet1); + } else { + snprintf(buf, size, "No exception"); + } + return buf; +} + +static int gru_wait_idle_or_exception(struct gru_control_block_status *gen) +{ + while (gen->istatus >= CBS_ACTIVE) { + cpu_relax(); + barrier(); + } + return gen->istatus; +} + +static int gru_retry_exception(void *cb) +{ + struct gru_control_block_status *gen = (void *)cb; + struct control_block_extended_exc_detail excdet; + int retry = EXCEPTION_RETRY_LIMIT; + + while (1) { + if (gru_get_cb_message_queue_substatus(cb)) + break; + if (gru_wait_idle_or_exception(gen) == CBS_IDLE) + return CBS_IDLE; + + gru_get_cb_exception_detail(cb, &excdet); + if (excdet.ecause & ~EXCEPTION_RETRY_BITS) + break; + if (retry-- == 0) + break; + gen->icmd = 1; + gru_flush_cache(gen); + } + return CBS_EXCEPTION; +} + +int gru_check_status_proc(void *cb) +{ + struct gru_control_block_status *gen = (void *)cb; + int ret; + + ret = gen->istatus; + if (ret != CBS_EXCEPTION) + return ret; + return gru_retry_exception(cb); + +} + +int gru_wait_proc(void *cb) +{ + struct gru_control_block_status *gen = (void *)cb; + int ret; + + ret = gru_wait_idle_or_exception(gen); + if (ret == CBS_EXCEPTION) + ret = gru_retry_exception(cb); + + return ret; +} + +void gru_abort(int ret, void *cb, char *str) +{ + char buf[GRU_EXC_STR_SIZE]; + + panic("GRU FATAL ERROR: %s - %s\n", str, + gru_get_cb_exception_detail_str(ret, cb, buf, sizeof(buf))); +} + +void gru_wait_abort_proc(void *cb) +{ + int ret; + + ret = gru_wait_proc(cb); + if (ret) + gru_abort(ret, cb, "gru_wait_abort"); +} + + +/*------------------------------ MESSAGE QUEUES -----------------------------*/ + +/* Internal status . These are NOT returned to the user. */ +#define MQIE_AGAIN -1 /* try again */ + + +/* + * Save/restore the "present" flag that is in the second line of 2-line + * messages + */ +static inline int get_present2(void *p) +{ + struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES; + return mhdr->present; +} + +static inline void restore_present2(void *p, int val) +{ + struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES; + mhdr->present = val; +} + +/* + * Create a message queue. + * qlines - message queue size in cache lines. Includes 2-line header. + */ +int gru_create_message_queue(void *p, unsigned int bytes) +{ + struct message_queue *mq = p; + unsigned int qlines; + + qlines = bytes / GRU_CACHE_LINE_BYTES - 2; + memset(mq, 0, bytes); + mq->start = &mq->data; + mq->start2 = &mq->data + (qlines / 2 - 1) * GRU_CACHE_LINE_BYTES; + mq->next = &mq->data; + mq->limit = &mq->data + (qlines - 2) * GRU_CACHE_LINE_BYTES; + mq->qlines = qlines; + mq->hstatus[0] = 0; + mq->hstatus[1] = 1; + mq->head = gru_mesq_head(2, qlines / 2 + 1); + return 0; +} +EXPORT_SYMBOL_GPL(gru_create_message_queue); + +/* + * Send a NOOP message to a message queue + * Returns: + * 0 - if queue is full after the send. This is the normal case + * but various races can change this. + * -1 - if mesq sent successfully but queue not full + * >0 - unexpected error. MQE_xxx returned + */ +static int send_noop_message(void *cb, + unsigned long mq, void *mesg) +{ + const struct message_header noop_header = { + .present = MQS_NOOP, .lines = 1}; + unsigned long m; + int substatus, ret; + struct message_header save_mhdr, *mhdr = mesg; + + STAT(mesq_noop); + save_mhdr = *mhdr; + *mhdr = noop_header; + gru_mesq(cb, mq, gru_get_tri(mhdr), 1, IMA); + ret = gru_wait(cb); + + if (ret) { + substatus = gru_get_cb_message_queue_substatus(cb); + switch (substatus) { + case CBSS_NO_ERROR: + STAT(mesq_noop_unexpected_error); + ret = MQE_UNEXPECTED_CB_ERR; + break; + case CBSS_LB_OVERFLOWED: + STAT(mesq_noop_lb_overflow); + ret = MQE_CONGESTION; + break; + case CBSS_QLIMIT_REACHED: + STAT(mesq_noop_qlimit_reached); + ret = 0; + break; + case CBSS_AMO_NACKED: + STAT(mesq_noop_amo_nacked); + ret = MQE_CONGESTION; + break; + case CBSS_PUT_NACKED: + STAT(mesq_noop_put_nacked); + m = mq + (gru_get_amo_value_head(cb) << 6); + gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, 1, 1, + IMA); + if (gru_wait(cb) == CBS_IDLE) + ret = MQIE_AGAIN; + else + ret = MQE_UNEXPECTED_CB_ERR; + break; + case CBSS_PAGE_OVERFLOW: + default: + BUG(); + } + } + *mhdr = save_mhdr; + return ret; +} + +/* + * Handle a gru_mesq full. + */ +static int send_message_queue_full(void *cb, + unsigned long mq, void *mesg, int lines) +{ + union gru_mesqhead mqh; + unsigned int limit, head; + unsigned long avalue; + int half, qlines, save; + + /* Determine if switching to first/second half of q */ + avalue = gru_get_amo_value(cb); + head = gru_get_amo_value_head(cb); + limit = gru_get_amo_value_limit(cb); + + /* + * Fetch "qlines" from the queue header. Since the queue may be + * in memory that can't be accessed using socket addresses, use + * the GRU to access the data. Use DSR space from the message. + */ + save = *(int *)mesg; + gru_vload(cb, QLINES(mq), gru_get_tri(mesg), XTYPE_W, 1, 1, IMA); + if (gru_wait(cb) != CBS_IDLE) + goto cberr; + qlines = *(int *)mesg; + *(int *)mesg = save; + half = (limit != qlines); + + if (half) + mqh = gru_mesq_head(qlines / 2 + 1, qlines); + else + mqh = gru_mesq_head(2, qlines / 2 + 1); + + /* Try to get lock for switching head pointer */ + gru_gamir(cb, EOP_IR_CLR, HSTATUS(mq, half), XTYPE_DW, IMA); + if (gru_wait(cb) != CBS_IDLE) + goto cberr; + if (!gru_get_amo_value(cb)) { + STAT(mesq_qf_locked); + return MQE_QUEUE_FULL; + } + + /* Got the lock. Send optional NOP if queue not full, */ + if (head != limit) { + if (send_noop_message(cb, mq, mesg)) { + gru_gamir(cb, EOP_IR_INC, HSTATUS(mq, half), + XTYPE_DW, IMA); + if (gru_wait(cb) != CBS_IDLE) + goto cberr; + STAT(mesq_qf_noop_not_full); + return MQIE_AGAIN; + } + avalue++; + } + + /* Then flip queuehead to other half of queue. */ + gru_gamer(cb, EOP_ERR_CSWAP, mq, XTYPE_DW, mqh.val, avalue, IMA); + if (gru_wait(cb) != CBS_IDLE) + goto cberr; + + /* If not successfully in swapping queue head, clear the hstatus lock */ + if (gru_get_amo_value(cb) != avalue) { + STAT(mesq_qf_switch_head_failed); + gru_gamir(cb, EOP_IR_INC, HSTATUS(mq, half), XTYPE_DW, IMA); + if (gru_wait(cb) != CBS_IDLE) + goto cberr; + } + return MQIE_AGAIN; +cberr: + STAT(mesq_qf_unexpected_error); + return MQE_UNEXPECTED_CB_ERR; +} + + +/* + * Handle a gru_mesq failure. Some of these failures are software recoverable + * or retryable. + */ +static int send_message_failure(void *cb, + unsigned long mq, + void *mesg, + int lines) +{ + int substatus, ret = 0; + unsigned long m; + + substatus = gru_get_cb_message_queue_substatus(cb); + switch (substatus) { + case CBSS_NO_ERROR: + STAT(mesq_send_unexpected_error); + ret = MQE_UNEXPECTED_CB_ERR; + break; + case CBSS_LB_OVERFLOWED: + STAT(mesq_send_lb_overflow); + ret = MQE_CONGESTION; + break; + case CBSS_QLIMIT_REACHED: + STAT(mesq_send_qlimit_reached); + ret = send_message_queue_full(cb, mq, mesg, lines); + break; + case CBSS_AMO_NACKED: + STAT(mesq_send_amo_nacked); + ret = MQE_CONGESTION; + break; + case CBSS_PUT_NACKED: + STAT(mesq_send_put_nacked); + m =mq + (gru_get_amo_value_head(cb) << 6); + gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, lines, 1, IMA); + if (gru_wait(cb) == CBS_IDLE) + ret = MQE_OK; + else + ret = MQE_UNEXPECTED_CB_ERR; + break; + default: + BUG(); + } + return ret; +} + +/* + * Send a message to a message queue + * cb GRU control block to use to send message + * mq message queue + * mesg message. ust be vaddr within a GSEG + * bytes message size (<= 2 CL) + */ +int gru_send_message_gpa(unsigned long mq, void *mesg, unsigned int bytes) +{ + struct message_header *mhdr; + void *cb; + void *dsr; + int istatus, clines, ret; + + STAT(mesq_send); + BUG_ON(bytes < sizeof(int) || bytes > 2 * GRU_CACHE_LINE_BYTES); + + clines = (bytes + GRU_CACHE_LINE_BYTES - 1) / GRU_CACHE_LINE_BYTES; + if (gru_get_cpu_resources(bytes, &cb, &dsr)) + return MQE_BUG_NO_RESOURCES; + memcpy(dsr, mesg, bytes); + mhdr = dsr; + mhdr->present = MQS_FULL; + mhdr->lines = clines; + if (clines == 2) { + mhdr->present2 = get_present2(mhdr); + restore_present2(mhdr, MQS_FULL); + } + + do { + ret = MQE_OK; + gru_mesq(cb, mq, gru_get_tri(mhdr), clines, IMA); + istatus = gru_wait(cb); + if (istatus != CBS_IDLE) + ret = send_message_failure(cb, mq, dsr, clines); + } while (ret == MQIE_AGAIN); + gru_free_cpu_resources(cb, dsr); + + if (ret) + STAT(mesq_send_failed); + return ret; +} +EXPORT_SYMBOL_GPL(gru_send_message_gpa); + +/* + * Advance the receive pointer for the queue to the next message. + */ +void gru_free_message(void *rmq, void *mesg) +{ + struct message_queue *mq = rmq; + struct message_header *mhdr = mq->next; + void *next, *pnext; + int half = -1; + int lines = mhdr->lines; + + if (lines == 2) + restore_present2(mhdr, MQS_EMPTY); + mhdr->present = MQS_EMPTY; + + pnext = mq->next; + next = pnext + GRU_CACHE_LINE_BYTES * lines; + if (next == mq->limit) { + next = mq->start; + half = 1; + } else if (pnext < mq->start2 && next >= mq->start2) { + half = 0; + } + + if (half >= 0) + mq->hstatus[half] = 1; + mq->next = next; +} +EXPORT_SYMBOL_GPL(gru_free_message); + +/* + * Get next message from message queue. Return NULL if no message + * present. User must call next_message() to move to next message. + * rmq message queue + */ +void *gru_get_next_message(void *rmq) +{ + struct message_queue *mq = rmq; + struct message_header *mhdr = mq->next; + int present = mhdr->present; + + /* skip NOOP messages */ + STAT(mesq_receive); + while (present == MQS_NOOP) { + gru_free_message(rmq, mhdr); + mhdr = mq->next; + present = mhdr->present; + } + + /* Wait for both halves of 2 line messages */ + if (present == MQS_FULL && mhdr->lines == 2 && + get_present2(mhdr) == MQS_EMPTY) + present = MQS_EMPTY; + + if (!present) { + STAT(mesq_receive_none); + return NULL; + } + + if (mhdr->lines == 2) + restore_present2(mhdr, mhdr->present2); + + return mhdr; +} +EXPORT_SYMBOL_GPL(gru_get_next_message); + +/* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/ + +/* + * Copy a block of data using the GRU resources + */ +int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa, + unsigned int bytes) +{ + void *cb; + void *dsr; + int ret; + + STAT(copy_gpa); + if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr)) + return MQE_BUG_NO_RESOURCES; + gru_bcopy(cb, src_gpa, dest_gpa, gru_get_tri(dsr), + XTYPE_B, bytes, GRU_NUM_KERNEL_DSR_BYTES, IMA); + ret = gru_wait(cb); + gru_free_cpu_resources(cb, dsr); + return ret; +} +EXPORT_SYMBOL_GPL(gru_copy_gpa); + +/* ------------------- KERNEL QUICKTESTS RUN AT STARTUP ----------------*/ +/* Temp - will delete after we gain confidence in the GRU */ +static __cacheline_aligned unsigned long word0; +static __cacheline_aligned unsigned long word1; + +static int quicktest(struct gru_state *gru) +{ + void *cb; + void *ds; + unsigned long *p; + + cb = get_gseg_base_address_cb(gru->gs_gru_base_vaddr, KERNEL_CTXNUM, 0); + ds = get_gseg_base_address_ds(gru->gs_gru_base_vaddr, KERNEL_CTXNUM, 0); + p = ds; + word0 = MAGIC; + + gru_vload(cb, uv_gpa(&word0), 0, XTYPE_DW, 1, 1, IMA); + if (gru_wait(cb) != CBS_IDLE) + BUG(); + + if (*(unsigned long *)ds != MAGIC) + BUG(); + gru_vstore(cb, uv_gpa(&word1), 0, XTYPE_DW, 1, 1, IMA); + if (gru_wait(cb) != CBS_IDLE) + BUG(); + + if (word0 != word1 || word0 != MAGIC) { + printk + ("GRU quicktest err: gru %d, found 0x%lx, expected 0x%lx\n", + gru->gs_gid, word1, MAGIC); + BUG(); /* ZZZ should not be fatal */ + } + + return 0; +} + + +int gru_kservices_init(struct gru_state *gru) +{ + struct gru_blade_state *bs; + struct gru_context_configuration_handle *cch; + unsigned long cbr_map, dsr_map; + int err, num, cpus_possible; + + /* + * Currently, resources are reserved ONLY on the second chiplet + * on each blade. This leaves ALL resources on chiplet 0 available + * for user code. + */ + bs = gru->gs_blade; + if (gru != &bs->bs_grus[1]) + return 0; + + cpus_possible = uv_blade_nr_possible_cpus(gru->gs_blade_id); + + num = GRU_NUM_KERNEL_CBR * cpus_possible; + cbr_map = gru_reserve_cb_resources(gru, GRU_CB_COUNT_TO_AU(num), NULL); + gru->gs_reserved_cbrs += num; + + num = GRU_NUM_KERNEL_DSR_BYTES * cpus_possible; + dsr_map = gru_reserve_ds_resources(gru, GRU_DS_BYTES_TO_AU(num), NULL); + gru->gs_reserved_dsr_bytes += num; + + gru->gs_active_contexts++; + __set_bit(KERNEL_CTXNUM, &gru->gs_context_map); + cch = get_cch(gru->gs_gru_base_vaddr, KERNEL_CTXNUM); + + bs->kernel_cb = get_gseg_base_address_cb(gru->gs_gru_base_vaddr, + KERNEL_CTXNUM, 0); + bs->kernel_dsr = get_gseg_base_address_ds(gru->gs_gru_base_vaddr, + KERNEL_CTXNUM, 0); + + lock_cch_handle(cch); + cch->tfm_fault_bit_enable = 0; + cch->tlb_int_enable = 0; + cch->tfm_done_bit_enable = 0; + cch->unmap_enable = 1; + err = cch_allocate(cch, 0, cbr_map, dsr_map); + if (err) { + gru_dbg(grudev, + "Unable to allocate kernel CCH: gru %d, err %d\n", + gru->gs_gid, err); + BUG(); + } + if (cch_start(cch)) { + gru_dbg(grudev, "Unable to start kernel CCH: gru %d, err %d\n", + gru->gs_gid, err); + BUG(); + } + unlock_cch_handle(cch); + + if (gru_options & GRU_QUICKLOOK) + quicktest(gru); + return 0; +} diff --git a/drivers/misc/sgi-gru/grukservices.h b/drivers/misc/sgi-gru/grukservices.h new file mode 100644 index 00000000000..eb17e0a3ac6 --- /dev/null +++ b/drivers/misc/sgi-gru/grukservices.h @@ -0,0 +1,134 @@ + +/* + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef __GRU_KSERVICES_H_ +#define __GRU_KSERVICES_H_ + + +/* + * Message queues using the GRU to send/receive messages. + * + * These function allow the user to create a message queue for + * sending/receiving 1 or 2 cacheline messages using the GRU. + * + * Processes SENDING messages will use a kernel CBR/DSR to send + * the message. This is transparent to the caller. + * + * The receiver does not use any GRU resources. + * + * The functions support: + * - single receiver + * - multiple senders + * - cross partition message + * + * Missing features ZZZ: + * - user options for dealing with timeouts, queue full, etc. + * - gru_create_message_queue() needs interrupt vector info + */ + +/* + * Initialize a user allocated chunk of memory to be used as + * a message queue. The caller must ensure that the queue is + * in contiguous physical memory and is cacheline aligned. + * + * Message queue size is the total number of bytes allocated + * to the queue including a 2 cacheline header that is used + * to manage the queue. + * + * Input: + * p pointer to user allocated memory. + * bytes size of message queue in bytes + * + * Errors: + * 0 OK + * >0 error + */ +extern int gru_create_message_queue(void *p, unsigned int bytes); + +/* + * Send a message to a message queue. + * + * Note: The message queue transport mechanism uses the first 32 + * bits of the message. Users should avoid using these bits. + * + * + * Input: + * xmq message queue - must be a UV global physical address + * mesg pointer to message. Must be 64-bit aligned + * bytes size of message in bytes + * + * Output: + * 0 message sent + * >0 Send failure - see error codes below + * + */ +extern int gru_send_message_gpa(unsigned long mq_gpa, void *mesg, + unsigned int bytes); + +/* Status values for gru_send_message() */ +#define MQE_OK 0 /* message sent successfully */ +#define MQE_CONGESTION 1 /* temporary congestion, try again */ +#define MQE_QUEUE_FULL 2 /* queue is full */ +#define MQE_UNEXPECTED_CB_ERR 3 /* unexpected CB error */ +#define MQE_PAGE_OVERFLOW 10 /* BUG - queue overflowed a page */ +#define MQE_BUG_NO_RESOURCES 11 /* BUG - could not alloc GRU cb/dsr */ + +/* + * Advance the receive pointer for the message queue to the next message. + * Note: current API requires messages to be gotten & freed in order. Future + * API extensions may allow for out-of-order freeing. + * + * Input + * mq message queue + * mesq message being freed + */ +extern void gru_free_message(void *mq, void *mesq); + +/* + * Get next message from message queue. Returns pointer to + * message OR NULL if no message present. + * User must call gru_free_message() after message is processed + * in order to move the queue pointers to next message. + * + * Input + * mq message queue + * + * Output: + * p pointer to message + * NULL no message available + */ +extern void *gru_get_next_message(void *mq); + + +/* + * Copy data using the GRU. Source or destination can be located in a remote + * partition. + * + * Input: + * dest_gpa destination global physical address + * src_gpa source global physical address + * bytes number of bytes to copy + * + * Output: + * 0 OK + * >0 error + */ +extern int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa, + unsigned int bytes); + +#endif /* __GRU_KSERVICES_H_ */ diff --git a/drivers/misc/sgi-gru/grulib.h b/drivers/misc/sgi-gru/grulib.h new file mode 100644 index 00000000000..e56e196a699 --- /dev/null +++ b/drivers/misc/sgi-gru/grulib.h @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __GRULIB_H__ +#define __GRULIB_H__ + +#define GRU_BASENAME "gru" +#define GRU_FULLNAME "/dev/gru" +#define GRU_IOCTL_NUM 'G' + +/* + * Maximum number of GRU segments that a user can have open + * ZZZ temp - set high for testing. Revisit. + */ +#define GRU_MAX_OPEN_CONTEXTS 32 + +/* Set Number of Request Blocks */ +#define GRU_CREATE_CONTEXT _IOWR(GRU_IOCTL_NUM, 1, void *) + +/* Register task as using the slice */ +#define GRU_SET_TASK_SLICE _IOWR(GRU_IOCTL_NUM, 5, void *) + +/* Fetch exception detail */ +#define GRU_USER_GET_EXCEPTION_DETAIL _IOWR(GRU_IOCTL_NUM, 6, void *) + +/* For user call_os handling - normally a TLB fault */ +#define GRU_USER_CALL_OS _IOWR(GRU_IOCTL_NUM, 8, void *) + +/* For user unload context */ +#define GRU_USER_UNLOAD_CONTEXT _IOWR(GRU_IOCTL_NUM, 9, void *) + +/* For fetching GRU chiplet status */ +#define GRU_GET_CHIPLET_STATUS _IOWR(GRU_IOCTL_NUM, 10, void *) + +/* For user TLB flushing (primarily for tests) */ +#define GRU_USER_FLUSH_TLB _IOWR(GRU_IOCTL_NUM, 50, void *) + +/* Get some config options (primarily for tests & emulator) */ +#define GRU_GET_CONFIG_INFO _IOWR(GRU_IOCTL_NUM, 51, void *) + +#define CONTEXT_WINDOW_BYTES(th) (GRU_GSEG_PAGESIZE * (th)) +#define THREAD_POINTER(p, th) (p + GRU_GSEG_PAGESIZE * (th)) + +/* + * Structure used to pass TLB flush parameters to the driver + */ +struct gru_create_context_req { + unsigned long gseg; + unsigned int data_segment_bytes; + unsigned int control_blocks; + unsigned int maximum_thread_count; + unsigned int options; +}; + +/* + * Structure used to pass unload context parameters to the driver + */ +struct gru_unload_context_req { + unsigned long gseg; +}; + +/* + * Structure used to pass TLB flush parameters to the driver + */ +struct gru_flush_tlb_req { + unsigned long gseg; + unsigned long vaddr; + size_t len; +}; + +/* + * GRU configuration info (temp - for testing) + */ +struct gru_config_info { + int cpus; + int blades; + int nodes; + int chiplets; + int fill[16]; +}; + +#endif /* __GRULIB_H__ */ diff --git a/drivers/misc/sgi-gru/grumain.c b/drivers/misc/sgi-gru/grumain.c new file mode 100644 index 00000000000..0eeb8dddd2f --- /dev/null +++ b/drivers/misc/sgi-gru/grumain.c @@ -0,0 +1,802 @@ +/* + * SN Platform GRU Driver + * + * DRIVER TABLE MANAGER + GRU CONTEXT LOAD/UNLOAD + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/device.h> +#include <linux/list.h> +#include <asm/uv/uv_hub.h> +#include "gru.h" +#include "grutables.h" +#include "gruhandles.h" + +unsigned long gru_options __read_mostly; + +static struct device_driver gru_driver = { + .name = "gru" +}; + +static struct device gru_device = { + .bus_id = {0}, + .driver = &gru_driver, +}; + +struct device *grudev = &gru_device; + +/* + * Select a gru fault map to be used by the current cpu. Note that + * multiple cpus may be using the same map. + * ZZZ should "shift" be used?? Depends on HT cpu numbering + * ZZZ should be inline but did not work on emulator + */ +int gru_cpu_fault_map_id(void) +{ + return uv_blade_processor_id() % GRU_NUM_TFM; +} + +/*--------- ASID Management ------------------------------------------- + * + * Initially, assign asids sequentially from MIN_ASID .. MAX_ASID. + * Once MAX is reached, flush the TLB & start over. However, + * some asids may still be in use. There won't be many (percentage wise) still + * in use. Search active contexts & determine the value of the first + * asid in use ("x"s below). Set "limit" to this value. + * This defines a block of assignable asids. + * + * When "limit" is reached, search forward from limit+1 and determine the + * next block of assignable asids. + * + * Repeat until MAX_ASID is reached, then start over again. + * + * Each time MAX_ASID is reached, increment the asid generation. Since + * the search for in-use asids only checks contexts with GRUs currently + * assigned, asids in some contexts will be missed. Prior to loading + * a context, the asid generation of the GTS asid is rechecked. If it + * doesn't match the current generation, a new asid will be assigned. + * + * 0---------------x------------x---------------------x----| + * ^-next ^-limit ^-MAX_ASID + * + * All asid manipulation & context loading/unloading is protected by the + * gs_lock. + */ + +/* Hit the asid limit. Start over */ +static int gru_wrap_asid(struct gru_state *gru) +{ + gru_dbg(grudev, "gru %p\n", gru); + STAT(asid_wrap); + gru->gs_asid_gen++; + gru_flush_all_tlb(gru); + return MIN_ASID; +} + +/* Find the next chunk of unused asids */ +static int gru_reset_asid_limit(struct gru_state *gru, int asid) +{ + int i, gid, inuse_asid, limit; + + gru_dbg(grudev, "gru %p, asid 0x%x\n", gru, asid); + STAT(asid_next); + limit = MAX_ASID; + if (asid >= limit) + asid = gru_wrap_asid(gru); + gid = gru->gs_gid; +again: + for (i = 0; i < GRU_NUM_CCH; i++) { + if (!gru->gs_gts[i]) + continue; + inuse_asid = gru->gs_gts[i]->ts_gms->ms_asids[gid].mt_asid; + gru_dbg(grudev, "gru %p, inuse_asid 0x%x, cxtnum %d, gts %p\n", + gru, inuse_asid, i, gru->gs_gts[i]); + if (inuse_asid == asid) { + asid += ASID_INC; + if (asid >= limit) { + /* + * empty range: reset the range limit and + * start over + */ + limit = MAX_ASID; + if (asid >= MAX_ASID) + asid = gru_wrap_asid(gru); + goto again; + } + } + + if ((inuse_asid > asid) && (inuse_asid < limit)) + limit = inuse_asid; + } + gru->gs_asid_limit = limit; + gru->gs_asid = asid; + gru_dbg(grudev, "gru %p, new asid 0x%x, new_limit 0x%x\n", gru, asid, + limit); + return asid; +} + +/* Assign a new ASID to a thread context. */ +static int gru_assign_asid(struct gru_state *gru) +{ + int asid; + + spin_lock(&gru->gs_asid_lock); + gru->gs_asid += ASID_INC; + asid = gru->gs_asid; + if (asid >= gru->gs_asid_limit) + asid = gru_reset_asid_limit(gru, asid); + spin_unlock(&gru->gs_asid_lock); + + gru_dbg(grudev, "gru %p, asid 0x%x\n", gru, asid); + return asid; +} + +/* + * Clear n bits in a word. Return a word indicating the bits that were cleared. + * Optionally, build an array of chars that contain the bit numbers allocated. + */ +static unsigned long reserve_resources(unsigned long *p, int n, int mmax, + char *idx) +{ + unsigned long bits = 0; + int i; + + do { + i = find_first_bit(p, mmax); + if (i == mmax) + BUG(); + __clear_bit(i, p); + __set_bit(i, &bits); + if (idx) + *idx++ = i; + } while (--n); + return bits; +} + +unsigned long gru_reserve_cb_resources(struct gru_state *gru, int cbr_au_count, + char *cbmap) +{ + return reserve_resources(&gru->gs_cbr_map, cbr_au_count, GRU_CBR_AU, + cbmap); +} + +unsigned long gru_reserve_ds_resources(struct gru_state *gru, int dsr_au_count, + char *dsmap) +{ + return reserve_resources(&gru->gs_dsr_map, dsr_au_count, GRU_DSR_AU, + dsmap); +} + +static void reserve_gru_resources(struct gru_state *gru, + struct gru_thread_state *gts) +{ + gru->gs_active_contexts++; + gts->ts_cbr_map = + gru_reserve_cb_resources(gru, gts->ts_cbr_au_count, + gts->ts_cbr_idx); + gts->ts_dsr_map = + gru_reserve_ds_resources(gru, gts->ts_dsr_au_count, NULL); +} + +static void free_gru_resources(struct gru_state *gru, + struct gru_thread_state *gts) +{ + gru->gs_active_contexts--; + gru->gs_cbr_map |= gts->ts_cbr_map; + gru->gs_dsr_map |= gts->ts_dsr_map; +} + +/* + * Check if a GRU has sufficient free resources to satisfy an allocation + * request. Note: GRU locks may or may not be held when this is called. If + * not held, recheck after acquiring the appropriate locks. + * + * Returns 1 if sufficient resources, 0 if not + */ +static int check_gru_resources(struct gru_state *gru, int cbr_au_count, + int dsr_au_count, int max_active_contexts) +{ + return hweight64(gru->gs_cbr_map) >= cbr_au_count + && hweight64(gru->gs_dsr_map) >= dsr_au_count + && gru->gs_active_contexts < max_active_contexts; +} + +/* + * TLB manangment requires tracking all GRU chiplets that have loaded a GSEG + * context. + */ +static int gru_load_mm_tracker(struct gru_state *gru, struct gru_mm_struct *gms, + int ctxnum) +{ + struct gru_mm_tracker *asids = &gms->ms_asids[gru->gs_gid]; + unsigned short ctxbitmap = (1 << ctxnum); + int asid; + + spin_lock(&gms->ms_asid_lock); + asid = asids->mt_asid; + + if (asid == 0 || asids->mt_asid_gen != gru->gs_asid_gen) { + asid = gru_assign_asid(gru); + asids->mt_asid = asid; + asids->mt_asid_gen = gru->gs_asid_gen; + STAT(asid_new); + } else { + STAT(asid_reuse); + } + + BUG_ON(asids->mt_ctxbitmap & ctxbitmap); + asids->mt_ctxbitmap |= ctxbitmap; + if (!test_bit(gru->gs_gid, gms->ms_asidmap)) + __set_bit(gru->gs_gid, gms->ms_asidmap); + spin_unlock(&gms->ms_asid_lock); + + gru_dbg(grudev, + "gru %x, gms %p, ctxnum 0x%d, asid 0x%x, asidmap 0x%lx\n", + gru->gs_gid, gms, ctxnum, asid, gms->ms_asidmap[0]); + return asid; +} + +static void gru_unload_mm_tracker(struct gru_state *gru, + struct gru_mm_struct *gms, int ctxnum) +{ + struct gru_mm_tracker *asids; + unsigned short ctxbitmap; + + asids = &gms->ms_asids[gru->gs_gid]; + ctxbitmap = (1 << ctxnum); + spin_lock(&gms->ms_asid_lock); + BUG_ON((asids->mt_ctxbitmap & ctxbitmap) != ctxbitmap); + asids->mt_ctxbitmap ^= ctxbitmap; + gru_dbg(grudev, "gru %x, gms %p, ctxnum 0x%d, asidmap 0x%lx\n", + gru->gs_gid, gms, ctxnum, gms->ms_asidmap[0]); + spin_unlock(&gms->ms_asid_lock); +} + +/* + * Decrement the reference count on a GTS structure. Free the structure + * if the reference count goes to zero. + */ +void gts_drop(struct gru_thread_state *gts) +{ + if (gts && atomic_dec_return(>s->ts_refcnt) == 0) { + gru_drop_mmu_notifier(gts->ts_gms); + kfree(gts); + STAT(gts_free); + } +} + +/* + * Locate the GTS structure for the current thread. + */ +static struct gru_thread_state *gru_find_current_gts_nolock(struct gru_vma_data + *vdata, int tsid) +{ + struct gru_thread_state *gts; + + list_for_each_entry(gts, &vdata->vd_head, ts_next) + if (gts->ts_tsid == tsid) + return gts; + return NULL; +} + +/* + * Allocate a thread state structure. + */ +static struct gru_thread_state *gru_alloc_gts(struct vm_area_struct *vma, + struct gru_vma_data *vdata, + int tsid) +{ + struct gru_thread_state *gts; + int bytes; + + bytes = DSR_BYTES(vdata->vd_dsr_au_count) + + CBR_BYTES(vdata->vd_cbr_au_count); + bytes += sizeof(struct gru_thread_state); + gts = kzalloc(bytes, GFP_KERNEL); + if (!gts) + return NULL; + + STAT(gts_alloc); + atomic_set(>s->ts_refcnt, 1); + mutex_init(>s->ts_ctxlock); + gts->ts_cbr_au_count = vdata->vd_cbr_au_count; + gts->ts_dsr_au_count = vdata->vd_dsr_au_count; + gts->ts_user_options = vdata->vd_user_options; + gts->ts_tsid = tsid; + gts->ts_user_options = vdata->vd_user_options; + gts->ts_ctxnum = NULLCTX; + gts->ts_mm = current->mm; + gts->ts_vma = vma; + gts->ts_tlb_int_select = -1; + gts->ts_gms = gru_register_mmu_notifier(); + if (!gts->ts_gms) + goto err; + + gru_dbg(grudev, "alloc vdata %p, new gts %p\n", vdata, gts); + return gts; + +err: + gts_drop(gts); + return NULL; +} + +/* + * Allocate a vma private data structure. + */ +struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma, int tsid) +{ + struct gru_vma_data *vdata = NULL; + + vdata = kmalloc(sizeof(*vdata), GFP_KERNEL); + if (!vdata) + return NULL; + + INIT_LIST_HEAD(&vdata->vd_head); + spin_lock_init(&vdata->vd_lock); + gru_dbg(grudev, "alloc vdata %p\n", vdata); + return vdata; +} + +/* + * Find the thread state structure for the current thread. + */ +struct gru_thread_state *gru_find_thread_state(struct vm_area_struct *vma, + int tsid) +{ + struct gru_vma_data *vdata = vma->vm_private_data; + struct gru_thread_state *gts; + + spin_lock(&vdata->vd_lock); + gts = gru_find_current_gts_nolock(vdata, tsid); + spin_unlock(&vdata->vd_lock); + gru_dbg(grudev, "vma %p, gts %p\n", vma, gts); + return gts; +} + +/* + * Allocate a new thread state for a GSEG. Note that races may allow + * another thread to race to create a gts. + */ +struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct *vma, + int tsid) +{ + struct gru_vma_data *vdata = vma->vm_private_data; + struct gru_thread_state *gts, *ngts; + + gts = gru_alloc_gts(vma, vdata, tsid); + if (!gts) + return NULL; + + spin_lock(&vdata->vd_lock); + ngts = gru_find_current_gts_nolock(vdata, tsid); + if (ngts) { + gts_drop(gts); + gts = ngts; + STAT(gts_double_allocate); + } else { + list_add(>s->ts_next, &vdata->vd_head); + } + spin_unlock(&vdata->vd_lock); + gru_dbg(grudev, "vma %p, gts %p\n", vma, gts); + return gts; +} + +/* + * Free the GRU context assigned to the thread state. + */ +static void gru_free_gru_context(struct gru_thread_state *gts) +{ + struct gru_state *gru; + + gru = gts->ts_gru; + gru_dbg(grudev, "gts %p, gru %p\n", gts, gru); + + spin_lock(&gru->gs_lock); + gru->gs_gts[gts->ts_ctxnum] = NULL; + free_gru_resources(gru, gts); + BUG_ON(test_bit(gts->ts_ctxnum, &gru->gs_context_map) == 0); + __clear_bit(gts->ts_ctxnum, &gru->gs_context_map); + gts->ts_ctxnum = NULLCTX; + gts->ts_gru = NULL; + spin_unlock(&gru->gs_lock); + + gts_drop(gts); + STAT(free_context); +} + +/* + * Prefetching cachelines help hardware performance. + * (Strictly a performance enhancement. Not functionally required). + */ +static void prefetch_data(void *p, int num, int stride) +{ + while (num-- > 0) { + prefetchw(p); + p += stride; + } +} + +static inline long gru_copy_handle(void *d, void *s) +{ + memcpy(d, s, GRU_HANDLE_BYTES); + return GRU_HANDLE_BYTES; +} + +/* rewrite in assembly & use lots of prefetch */ +static void gru_load_context_data(void *save, void *grubase, int ctxnum, + unsigned long cbrmap, unsigned long dsrmap) +{ + void *gseg, *cb, *cbe; + unsigned long length; + int i, scr; + + gseg = grubase + ctxnum * GRU_GSEG_STRIDE; + length = hweight64(dsrmap) * GRU_DSR_AU_BYTES; + prefetch_data(gseg + GRU_DS_BASE, length / GRU_CACHE_LINE_BYTES, + GRU_CACHE_LINE_BYTES); + + cb = gseg + GRU_CB_BASE; + cbe = grubase + GRU_CBE_BASE; + for_each_cbr_in_allocation_map(i, &cbrmap, scr) { + prefetch_data(cb, 1, GRU_CACHE_LINE_BYTES); + prefetch_data(cbe + i * GRU_HANDLE_STRIDE, 1, + GRU_CACHE_LINE_BYTES); + cb += GRU_HANDLE_STRIDE; + } + + cb = gseg + GRU_CB_BASE; + for_each_cbr_in_allocation_map(i, &cbrmap, scr) { + save += gru_copy_handle(cb, save); + save += gru_copy_handle(cbe + i * GRU_HANDLE_STRIDE, save); + cb += GRU_HANDLE_STRIDE; + } + + memcpy(gseg + GRU_DS_BASE, save, length); +} + +static void gru_unload_context_data(void *save, void *grubase, int ctxnum, + unsigned long cbrmap, unsigned long dsrmap) +{ + void *gseg, *cb, *cbe; + unsigned long length; + int i, scr; + + gseg = grubase + ctxnum * GRU_GSEG_STRIDE; + + cb = gseg + GRU_CB_BASE; + cbe = grubase + GRU_CBE_BASE; + for_each_cbr_in_allocation_map(i, &cbrmap, scr) { + save += gru_copy_handle(save, cb); + save += gru_copy_handle(save, cbe + i * GRU_HANDLE_STRIDE); + cb += GRU_HANDLE_STRIDE; + } + length = hweight64(dsrmap) * GRU_DSR_AU_BYTES; + memcpy(save, gseg + GRU_DS_BASE, length); +} + +void gru_unload_context(struct gru_thread_state *gts, int savestate) +{ + struct gru_state *gru = gts->ts_gru; + struct gru_context_configuration_handle *cch; + int ctxnum = gts->ts_ctxnum; + + zap_vma_ptes(gts->ts_vma, UGRUADDR(gts), GRU_GSEG_PAGESIZE); + cch = get_cch(gru->gs_gru_base_vaddr, ctxnum); + + lock_cch_handle(cch); + if (cch_interrupt_sync(cch)) + BUG(); + gru_dbg(grudev, "gts %p\n", gts); + + gru_unload_mm_tracker(gru, gts->ts_gms, gts->ts_ctxnum); + if (savestate) + gru_unload_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr, + ctxnum, gts->ts_cbr_map, + gts->ts_dsr_map); + + if (cch_deallocate(cch)) + BUG(); + gts->ts_force_unload = 0; /* ts_force_unload locked by CCH lock */ + unlock_cch_handle(cch); + + gru_free_gru_context(gts); + STAT(unload_context); +} + +/* + * Load a GRU context by copying it from the thread data structure in memory + * to the GRU. + */ +static void gru_load_context(struct gru_thread_state *gts) +{ + struct gru_state *gru = gts->ts_gru; + struct gru_context_configuration_handle *cch; + int err, asid, ctxnum = gts->ts_ctxnum; + + gru_dbg(grudev, "gts %p\n", gts); + cch = get_cch(gru->gs_gru_base_vaddr, ctxnum); + + lock_cch_handle(cch); + asid = gru_load_mm_tracker(gru, gts->ts_gms, gts->ts_ctxnum); + cch->tfm_fault_bit_enable = + (gts->ts_user_options == GRU_OPT_MISS_FMM_POLL + || gts->ts_user_options == GRU_OPT_MISS_FMM_INTR); + cch->tlb_int_enable = (gts->ts_user_options == GRU_OPT_MISS_FMM_INTR); + if (cch->tlb_int_enable) { + gts->ts_tlb_int_select = gru_cpu_fault_map_id(); + cch->tlb_int_select = gts->ts_tlb_int_select; + } + cch->tfm_done_bit_enable = 0; + err = cch_allocate(cch, asid, gts->ts_cbr_map, gts->ts_dsr_map); + if (err) { + gru_dbg(grudev, + "err %d: cch %p, gts %p, cbr 0x%lx, dsr 0x%lx\n", + err, cch, gts, gts->ts_cbr_map, gts->ts_dsr_map); + BUG(); + } + + gru_load_context_data(gts->ts_gdata, gru->gs_gru_base_vaddr, ctxnum, + gts->ts_cbr_map, gts->ts_dsr_map); + + if (cch_start(cch)) + BUG(); + unlock_cch_handle(cch); + + STAT(load_context); +} + +/* + * Update fields in an active CCH: + * - retarget interrupts on local blade + * - force a delayed context unload by clearing the CCH asids. This + * forces TLB misses for new GRU instructions. The context is unloaded + * when the next TLB miss occurs. + */ +static int gru_update_cch(struct gru_thread_state *gts, int int_select) +{ + struct gru_context_configuration_handle *cch; + struct gru_state *gru = gts->ts_gru; + int i, ctxnum = gts->ts_ctxnum, ret = 0; + + cch = get_cch(gru->gs_gru_base_vaddr, ctxnum); + + lock_cch_handle(cch); + if (cch->state == CCHSTATE_ACTIVE) { + if (gru->gs_gts[gts->ts_ctxnum] != gts) + goto exit; + if (cch_interrupt(cch)) + BUG(); + if (int_select >= 0) { + gts->ts_tlb_int_select = int_select; + cch->tlb_int_select = int_select; + } else { + for (i = 0; i < 8; i++) + cch->asid[i] = 0; + cch->tfm_fault_bit_enable = 0; + cch->tlb_int_enable = 0; + gts->ts_force_unload = 1; + } + if (cch_start(cch)) + BUG(); + ret = 1; + } +exit: + unlock_cch_handle(cch); + return ret; +} + +/* + * Update CCH tlb interrupt select. Required when all the following is true: + * - task's GRU context is loaded into a GRU + * - task is using interrupt notification for TLB faults + * - task has migrated to a different cpu on the same blade where + * it was previously running. + */ +static int gru_retarget_intr(struct gru_thread_state *gts) +{ + if (gts->ts_tlb_int_select < 0 + || gts->ts_tlb_int_select == gru_cpu_fault_map_id()) + return 0; + + gru_dbg(grudev, "retarget from %d to %d\n", gts->ts_tlb_int_select, + gru_cpu_fault_map_id()); + return gru_update_cch(gts, gru_cpu_fault_map_id()); +} + + +/* + * Insufficient GRU resources available on the local blade. Steal a context from + * a process. This is a hack until a _real_ resource scheduler is written.... + */ +#define next_ctxnum(n) ((n) < GRU_NUM_CCH - 2 ? (n) + 1 : 0) +#define next_gru(b, g) (((g) < &(b)->bs_grus[GRU_CHIPLETS_PER_BLADE - 1]) ? \ + ((g)+1) : &(b)->bs_grus[0]) + +static void gru_steal_context(struct gru_thread_state *gts) +{ + struct gru_blade_state *blade; + struct gru_state *gru, *gru0; + struct gru_thread_state *ngts = NULL; + int ctxnum, ctxnum0, flag = 0, cbr, dsr; + + cbr = gts->ts_cbr_au_count; + dsr = gts->ts_dsr_au_count; + + preempt_disable(); + blade = gru_base[uv_numa_blade_id()]; + spin_lock(&blade->bs_lock); + + ctxnum = next_ctxnum(blade->bs_lru_ctxnum); + gru = blade->bs_lru_gru; + if (ctxnum == 0) + gru = next_gru(blade, gru); + ctxnum0 = ctxnum; + gru0 = gru; + while (1) { + if (check_gru_resources(gru, cbr, dsr, GRU_NUM_CCH)) + break; + spin_lock(&gru->gs_lock); + for (; ctxnum < GRU_NUM_CCH; ctxnum++) { + if (flag && gru == gru0 && ctxnum == ctxnum0) + break; + ngts = gru->gs_gts[ctxnum]; + /* + * We are grabbing locks out of order, so trylock is + * needed. GTSs are usually not locked, so the odds of + * success are high. If trylock fails, try to steal a + * different GSEG. + */ + if (ngts && mutex_trylock(&ngts->ts_ctxlock)) + break; + ngts = NULL; + flag = 1; + } + spin_unlock(&gru->gs_lock); + if (ngts || (flag && gru == gru0 && ctxnum == ctxnum0)) + break; + ctxnum = 0; + gru = next_gru(blade, gru); + } + blade->bs_lru_gru = gru; + blade->bs_lru_ctxnum = ctxnum; + spin_unlock(&blade->bs_lock); + preempt_enable(); + + if (ngts) { + STAT(steal_context); + ngts->ts_steal_jiffies = jiffies; + gru_unload_context(ngts, 1); + mutex_unlock(&ngts->ts_ctxlock); + } else { + STAT(steal_context_failed); + } + gru_dbg(grudev, + "stole gru %x, ctxnum %d from gts %p. Need cb %d, ds %d;" + " avail cb %ld, ds %ld\n", + gru->gs_gid, ctxnum, ngts, cbr, dsr, hweight64(gru->gs_cbr_map), + hweight64(gru->gs_dsr_map)); +} + +/* + * Scan the GRUs on the local blade & assign a GRU context. + */ +static struct gru_state *gru_assign_gru_context(struct gru_thread_state *gts) +{ + struct gru_state *gru, *grux; + int i, max_active_contexts; + + preempt_disable(); + +again: + gru = NULL; + max_active_contexts = GRU_NUM_CCH; + for_each_gru_on_blade(grux, uv_numa_blade_id(), i) { + if (check_gru_resources(grux, gts->ts_cbr_au_count, + gts->ts_dsr_au_count, + max_active_contexts)) { + gru = grux; + max_active_contexts = grux->gs_active_contexts; + if (max_active_contexts == 0) + break; + } + } + + if (gru) { + spin_lock(&gru->gs_lock); + if (!check_gru_resources(gru, gts->ts_cbr_au_count, + gts->ts_dsr_au_count, GRU_NUM_CCH)) { + spin_unlock(&gru->gs_lock); + goto again; + } + reserve_gru_resources(gru, gts); + gts->ts_gru = gru; + gts->ts_ctxnum = + find_first_zero_bit(&gru->gs_context_map, GRU_NUM_CCH); + BUG_ON(gts->ts_ctxnum == GRU_NUM_CCH); + atomic_inc(>s->ts_refcnt); + gru->gs_gts[gts->ts_ctxnum] = gts; + __set_bit(gts->ts_ctxnum, &gru->gs_context_map); + spin_unlock(&gru->gs_lock); + + STAT(assign_context); + gru_dbg(grudev, + "gseg %p, gts %p, gru %x, ctx %d, cbr %d, dsr %d\n", + gseg_virtual_address(gts->ts_gru, gts->ts_ctxnum), gts, + gts->ts_gru->gs_gid, gts->ts_ctxnum, + gts->ts_cbr_au_count, gts->ts_dsr_au_count); + } else { + gru_dbg(grudev, "failed to allocate a GTS %s\n", ""); + STAT(assign_context_failed); + } + + preempt_enable(); + return gru; +} + +/* + * gru_nopage + * + * Map the user's GRU segment + * + * Note: gru segments alway mmaped on GRU_GSEG_PAGESIZE boundaries. + */ +int gru_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct gru_thread_state *gts; + unsigned long paddr, vaddr; + + vaddr = (unsigned long)vmf->virtual_address; + gru_dbg(grudev, "vma %p, vaddr 0x%lx (0x%lx)\n", + vma, vaddr, GSEG_BASE(vaddr)); + STAT(nopfn); + + /* The following check ensures vaddr is a valid address in the VMA */ + gts = gru_find_thread_state(vma, TSID(vaddr, vma)); + if (!gts) + return VM_FAULT_SIGBUS; + +again: + preempt_disable(); + mutex_lock(>s->ts_ctxlock); + if (gts->ts_gru) { + if (gts->ts_gru->gs_blade_id != uv_numa_blade_id()) { + STAT(migrated_nopfn_unload); + gru_unload_context(gts, 1); + } else { + if (gru_retarget_intr(gts)) + STAT(migrated_nopfn_retarget); + } + } + + if (!gts->ts_gru) { + if (!gru_assign_gru_context(gts)) { + mutex_unlock(>s->ts_ctxlock); + preempt_enable(); + schedule_timeout(GRU_ASSIGN_DELAY); /* true hack ZZZ */ + if (gts->ts_steal_jiffies + GRU_STEAL_DELAY < jiffies) + gru_steal_context(gts); + goto again; + } + gru_load_context(gts); + paddr = gseg_physical_address(gts->ts_gru, gts->ts_ctxnum); + remap_pfn_range(vma, vaddr & ~(GRU_GSEG_PAGESIZE - 1), + paddr >> PAGE_SHIFT, GRU_GSEG_PAGESIZE, + vma->vm_page_prot); + } + + mutex_unlock(>s->ts_ctxlock); + preempt_enable(); + + return VM_FAULT_NOPAGE; +} + diff --git a/drivers/misc/sgi-gru/gruprocfs.c b/drivers/misc/sgi-gru/gruprocfs.c new file mode 100644 index 00000000000..533923f83f1 --- /dev/null +++ b/drivers/misc/sgi-gru/gruprocfs.c @@ -0,0 +1,336 @@ +/* + * SN Platform GRU Driver + * + * PROC INTERFACES + * + * This file supports the /proc interfaces for the GRU driver + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/proc_fs.h> +#include <linux/device.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include "gru.h" +#include "grulib.h" +#include "grutables.h" + +#define printstat(s, f) printstat_val(s, &gru_stats.f, #f) + +static void printstat_val(struct seq_file *s, atomic_long_t *v, char *id) +{ + unsigned long val = atomic_long_read(v); + + if (val) + seq_printf(s, "%16lu %s\n", val, id); +} + +static int statistics_show(struct seq_file *s, void *p) +{ + printstat(s, vdata_alloc); + printstat(s, vdata_free); + printstat(s, gts_alloc); + printstat(s, gts_free); + printstat(s, vdata_double_alloc); + printstat(s, gts_double_allocate); + printstat(s, assign_context); + printstat(s, assign_context_failed); + printstat(s, free_context); + printstat(s, load_context); + printstat(s, unload_context); + printstat(s, steal_context); + printstat(s, steal_context_failed); + printstat(s, nopfn); + printstat(s, break_cow); + printstat(s, asid_new); + printstat(s, asid_next); + printstat(s, asid_wrap); + printstat(s, asid_reuse); + printstat(s, intr); + printstat(s, call_os); + printstat(s, call_os_check_for_bug); + printstat(s, call_os_wait_queue); + printstat(s, user_flush_tlb); + printstat(s, user_unload_context); + printstat(s, user_exception); + printstat(s, set_task_slice); + printstat(s, migrate_check); + printstat(s, migrated_retarget); + printstat(s, migrated_unload); + printstat(s, migrated_unload_delay); + printstat(s, migrated_nopfn_retarget); + printstat(s, migrated_nopfn_unload); + printstat(s, tlb_dropin); + printstat(s, tlb_dropin_fail_no_asid); + printstat(s, tlb_dropin_fail_upm); + printstat(s, tlb_dropin_fail_invalid); + printstat(s, tlb_dropin_fail_range_active); + printstat(s, tlb_dropin_fail_idle); + printstat(s, tlb_dropin_fail_fmm); + printstat(s, mmu_invalidate_range); + printstat(s, mmu_invalidate_page); + printstat(s, mmu_clear_flush_young); + printstat(s, flush_tlb); + printstat(s, flush_tlb_gru); + printstat(s, flush_tlb_gru_tgh); + printstat(s, flush_tlb_gru_zero_asid); + printstat(s, copy_gpa); + printstat(s, mesq_receive); + printstat(s, mesq_receive_none); + printstat(s, mesq_send); + printstat(s, mesq_send_failed); + printstat(s, mesq_noop); + printstat(s, mesq_send_unexpected_error); + printstat(s, mesq_send_lb_overflow); + printstat(s, mesq_send_qlimit_reached); + printstat(s, mesq_send_amo_nacked); + printstat(s, mesq_send_put_nacked); + printstat(s, mesq_qf_not_full); + printstat(s, mesq_qf_locked); + printstat(s, mesq_qf_noop_not_full); + printstat(s, mesq_qf_switch_head_failed); + printstat(s, mesq_qf_unexpected_error); + printstat(s, mesq_noop_unexpected_error); + printstat(s, mesq_noop_lb_overflow); + printstat(s, mesq_noop_qlimit_reached); + printstat(s, mesq_noop_amo_nacked); + printstat(s, mesq_noop_put_nacked); + return 0; +} + +static ssize_t statistics_write(struct file *file, const char __user *userbuf, + size_t count, loff_t *data) +{ + memset(&gru_stats, 0, sizeof(gru_stats)); + return count; +} + +static int options_show(struct seq_file *s, void *p) +{ + seq_printf(s, "0x%lx\n", gru_options); + return 0; +} + +static ssize_t options_write(struct file *file, const char __user *userbuf, + size_t count, loff_t *data) +{ + unsigned long val; + char buf[80]; + + if (copy_from_user + (buf, userbuf, count < sizeof(buf) ? count : sizeof(buf))) + return -EFAULT; + if (!strict_strtoul(buf, 10, &val)) + gru_options = val; + + return count; +} + +static int cch_seq_show(struct seq_file *file, void *data) +{ + long gid = *(long *)data; + int i; + struct gru_state *gru = GID_TO_GRU(gid); + struct gru_thread_state *ts; + const char *mode[] = { "??", "UPM", "INTR", "OS_POLL" }; + + if (gid == 0) + seq_printf(file, "#%5s%5s%6s%9s%6s%8s%8s\n", "gid", "bid", + "ctx#", "pid", "cbrs", "dsbytes", "mode"); + if (gru) + for (i = 0; i < GRU_NUM_CCH; i++) { + ts = gru->gs_gts[i]; + if (!ts) + continue; + seq_printf(file, " %5d%5d%6d%9d%6d%8d%8s\n", + gru->gs_gid, gru->gs_blade_id, i, + ts->ts_tgid_owner, + ts->ts_cbr_au_count * GRU_CBR_AU_SIZE, + ts->ts_cbr_au_count * GRU_DSR_AU_BYTES, + mode[ts->ts_user_options & + GRU_OPT_MISS_MASK]); + } + + return 0; +} + +static int gru_seq_show(struct seq_file *file, void *data) +{ + long gid = *(long *)data, ctxfree, cbrfree, dsrfree; + struct gru_state *gru = GID_TO_GRU(gid); + + if (gid == 0) { + seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "gid", "nid", + "ctx", "cbr", "dsr", "ctx", "cbr", "dsr"); + seq_printf(file, "#%5s%5s%7s%6s%6s%8s%6s%6s\n", "", "", "busy", + "busy", "busy", "free", "free", "free"); + } + if (gru) { + ctxfree = GRU_NUM_CCH - gru->gs_active_contexts; + cbrfree = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE; + dsrfree = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES; + seq_printf(file, " %5d%5d%7ld%6ld%6ld%8ld%6ld%6ld\n", + gru->gs_gid, gru->gs_blade_id, GRU_NUM_CCH - ctxfree, + GRU_NUM_CBE - cbrfree, GRU_NUM_DSR_BYTES - dsrfree, + ctxfree, cbrfree, dsrfree); + } + + return 0; +} + +static void seq_stop(struct seq_file *file, void *data) +{ +} + +static void *seq_start(struct seq_file *file, loff_t *gid) +{ + if (*gid < GRU_MAX_GRUS) + return gid; + return NULL; +} + +static void *seq_next(struct seq_file *file, void *data, loff_t *gid) +{ + (*gid)++; + if (*gid < GRU_MAX_GRUS) + return gid; + return NULL; +} + +static const struct seq_operations cch_seq_ops = { + .start = seq_start, + .next = seq_next, + .stop = seq_stop, + .show = cch_seq_show +}; + +static const struct seq_operations gru_seq_ops = { + .start = seq_start, + .next = seq_next, + .stop = seq_stop, + .show = gru_seq_show +}; + +static int statistics_open(struct inode *inode, struct file *file) +{ + return single_open(file, statistics_show, NULL); +} + +static int options_open(struct inode *inode, struct file *file) +{ + return single_open(file, options_show, NULL); +} + +static int cch_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &cch_seq_ops); +} + +static int gru_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &gru_seq_ops); +} + +/* *INDENT-OFF* */ +static const struct file_operations statistics_fops = { + .open = statistics_open, + .read = seq_read, + .write = statistics_write, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations options_fops = { + .open = options_open, + .read = seq_read, + .write = options_write, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations cch_fops = { + .open = cch_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; +static const struct file_operations gru_fops = { + .open = gru_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static struct proc_entry { + char *name; + int mode; + const struct file_operations *fops; + struct proc_dir_entry *entry; +} proc_files[] = { + {"statistics", 0644, &statistics_fops}, + {"debug_options", 0644, &options_fops}, + {"cch_status", 0444, &cch_fops}, + {"gru_status", 0444, &gru_fops}, + {NULL} +}; +/* *INDENT-ON* */ + +static struct proc_dir_entry *proc_gru __read_mostly; + +static int create_proc_file(struct proc_entry *p) +{ + p->entry = create_proc_entry(p->name, p->mode, proc_gru); + if (!p->entry) + return -1; + p->entry->proc_fops = p->fops; + return 0; +} + +static void delete_proc_files(void) +{ + struct proc_entry *p; + + if (proc_gru) { + for (p = proc_files; p->name; p++) + if (p->entry) + remove_proc_entry(p->name, proc_gru); + remove_proc_entry("gru", NULL); + } +} + +int gru_proc_init(void) +{ + struct proc_entry *p; + + proc_mkdir("sgi_uv", NULL); + proc_gru = proc_mkdir("sgi_uv/gru", NULL); + + for (p = proc_files; p->name; p++) + if (create_proc_file(p)) + goto err; + return 0; + +err: + delete_proc_files(); + return -1; +} + +void gru_proc_exit(void) +{ + delete_proc_files(); +} diff --git a/drivers/misc/sgi-gru/grutables.h b/drivers/misc/sgi-gru/grutables.h new file mode 100644 index 00000000000..a78f70deeb5 --- /dev/null +++ b/drivers/misc/sgi-gru/grutables.h @@ -0,0 +1,609 @@ +/* + * SN Platform GRU Driver + * + * GRU DRIVER TABLES, MACROS, externs, etc + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __GRUTABLES_H__ +#define __GRUTABLES_H__ + +/* + * GRU Chiplet: + * The GRU is a user addressible memory accelerator. It provides + * several forms of load, store, memset, bcopy instructions. In addition, it + * contains special instructions for AMOs, sending messages to message + * queues, etc. + * + * The GRU is an integral part of the node controller. It connects + * directly to the cpu socket. In its current implementation, there are 2 + * GRU chiplets in the node controller on each blade (~node). + * + * The entire GRU memory space is fully coherent and cacheable by the cpus. + * + * Each GRU chiplet has a physical memory map that looks like the following: + * + * +-----------------+ + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * +-----------------+ + * | system control | + * +-----------------+ _______ +-------------+ + * |/////////////////| / | | + * |/////////////////| / | | + * |/////////////////| / | instructions| + * |/////////////////| / | | + * |/////////////////| / | | + * |/////////////////| / |-------------| + * |/////////////////| / | | + * +-----------------+ | | + * | context 15 | | data | + * +-----------------+ | | + * | ...... | \ | | + * +-----------------+ \____________ +-------------+ + * | context 1 | + * +-----------------+ + * | context 0 | + * +-----------------+ + * + * Each of the "contexts" is a chunk of memory that can be mmaped into user + * space. The context consists of 2 parts: + * + * - an instruction space that can be directly accessed by the user + * to issue GRU instructions and to check instruction status. + * + * - a data area that acts as normal RAM. + * + * User instructions contain virtual addresses of data to be accessed by the + * GRU. The GRU contains a TLB that is used to convert these user virtual + * addresses to physical addresses. + * + * The "system control" area of the GRU chiplet is used by the kernel driver + * to manage user contexts and to perform functions such as TLB dropin and + * purging. + * + * One context may be reserved for the kernel and used for cross-partition + * communication. The GRU will also be used to asynchronously zero out + * large blocks of memory (not currently implemented). + * + * + * Tables: + * + * VDATA-VMA Data - Holds a few parameters. Head of linked list of + * GTS tables for threads using the GSEG + * GTS - Gru Thread State - contains info for managing a GSEG context. A + * GTS is allocated for each thread accessing a + * GSEG. + * GTD - GRU Thread Data - contains shadow copy of GRU data when GSEG is + * not loaded into a GRU + * GMS - GRU Memory Struct - Used to manage TLB shootdowns. Tracks GRUs + * where a GSEG has been loaded. Similar to + * an mm_struct but for GRU. + * + * GS - GRU State - Used to manage the state of a GRU chiplet + * BS - Blade State - Used to manage state of all GRU chiplets + * on a blade + * + * + * Normal task tables for task using GRU. + * - 2 threads in process + * - 2 GSEGs open in process + * - GSEG1 is being used by both threads + * - GSEG2 is used only by thread 2 + * + * task -->| + * task ---+---> mm ->------ (notifier) -------+-> gms + * | | + * |--> vma -> vdata ---> gts--->| GSEG1 (thread1) + * | | | + * | +-> gts--->| GSEG1 (thread2) + * | | + * |--> vma -> vdata ---> gts--->| GSEG2 (thread2) + * . + * . + * + * GSEGs are marked DONTCOPY on fork + * + * At open + * file.private_data -> NULL + * + * At mmap, + * vma -> vdata + * + * After gseg reference + * vma -> vdata ->gts + * + * After fork + * parent + * vma -> vdata -> gts + * child + * (vma is not copied) + * + */ + +#include <linux/rmap.h> +#include <linux/interrupt.h> +#include <linux/mutex.h> +#include <linux/wait.h> +#include <linux/mmu_notifier.h> +#include "gru.h" +#include "gruhandles.h" + +extern struct gru_stats_s gru_stats; +extern struct gru_blade_state *gru_base[]; +extern unsigned long gru_start_paddr, gru_end_paddr; + +#define GRU_MAX_BLADES MAX_NUMNODES +#define GRU_MAX_GRUS (GRU_MAX_BLADES * GRU_CHIPLETS_PER_BLADE) + +#define GRU_DRIVER_ID_STR "SGI GRU Device Driver" +#define GRU_DRIVER_VERSION_STR "0.80" + +/* + * GRU statistics. + */ +struct gru_stats_s { + atomic_long_t vdata_alloc; + atomic_long_t vdata_free; + atomic_long_t gts_alloc; + atomic_long_t gts_free; + atomic_long_t vdata_double_alloc; + atomic_long_t gts_double_allocate; + atomic_long_t assign_context; + atomic_long_t assign_context_failed; + atomic_long_t free_context; + atomic_long_t load_context; + atomic_long_t unload_context; + atomic_long_t steal_context; + atomic_long_t steal_context_failed; + atomic_long_t nopfn; + atomic_long_t break_cow; + atomic_long_t asid_new; + atomic_long_t asid_next; + atomic_long_t asid_wrap; + atomic_long_t asid_reuse; + atomic_long_t intr; + atomic_long_t call_os; + atomic_long_t call_os_check_for_bug; + atomic_long_t call_os_wait_queue; + atomic_long_t user_flush_tlb; + atomic_long_t user_unload_context; + atomic_long_t user_exception; + atomic_long_t set_task_slice; + atomic_long_t migrate_check; + atomic_long_t migrated_retarget; + atomic_long_t migrated_unload; + atomic_long_t migrated_unload_delay; + atomic_long_t migrated_nopfn_retarget; + atomic_long_t migrated_nopfn_unload; + atomic_long_t tlb_dropin; + atomic_long_t tlb_dropin_fail_no_asid; + atomic_long_t tlb_dropin_fail_upm; + atomic_long_t tlb_dropin_fail_invalid; + atomic_long_t tlb_dropin_fail_range_active; + atomic_long_t tlb_dropin_fail_idle; + atomic_long_t tlb_dropin_fail_fmm; + atomic_long_t mmu_invalidate_range; + atomic_long_t mmu_invalidate_page; + atomic_long_t mmu_clear_flush_young; + atomic_long_t flush_tlb; + atomic_long_t flush_tlb_gru; + atomic_long_t flush_tlb_gru_tgh; + atomic_long_t flush_tlb_gru_zero_asid; + + atomic_long_t copy_gpa; + + atomic_long_t mesq_receive; + atomic_long_t mesq_receive_none; + atomic_long_t mesq_send; + atomic_long_t mesq_send_failed; + atomic_long_t mesq_noop; + atomic_long_t mesq_send_unexpected_error; + atomic_long_t mesq_send_lb_overflow; + atomic_long_t mesq_send_qlimit_reached; + atomic_long_t mesq_send_amo_nacked; + atomic_long_t mesq_send_put_nacked; + atomic_long_t mesq_qf_not_full; + atomic_long_t mesq_qf_locked; + atomic_long_t mesq_qf_noop_not_full; + atomic_long_t mesq_qf_switch_head_failed; + atomic_long_t mesq_qf_unexpected_error; + atomic_long_t mesq_noop_unexpected_error; + atomic_long_t mesq_noop_lb_overflow; + atomic_long_t mesq_noop_qlimit_reached; + atomic_long_t mesq_noop_amo_nacked; + atomic_long_t mesq_noop_put_nacked; + +}; + +#define OPT_DPRINT 1 +#define OPT_STATS 2 +#define GRU_QUICKLOOK 4 + + +#define IRQ_GRU 110 /* Starting IRQ number for interrupts */ + +/* Delay in jiffies between attempts to assign a GRU context */ +#define GRU_ASSIGN_DELAY ((HZ * 20) / 1000) + +/* + * If a process has it's context stolen, min delay in jiffies before trying to + * steal a context from another process. + */ +#define GRU_STEAL_DELAY ((HZ * 200) / 1000) + +#define STAT(id) do { \ + if (gru_options & OPT_STATS) \ + atomic_long_inc(&gru_stats.id); \ + } while (0) + +#ifdef CONFIG_SGI_GRU_DEBUG +#define gru_dbg(dev, fmt, x...) \ + do { \ + if (gru_options & OPT_DPRINT) \ + dev_dbg(dev, "%s: " fmt, __func__, x); \ + } while (0) +#else +#define gru_dbg(x...) +#endif + +/*----------------------------------------------------------------------------- + * ASID management + */ +#define MAX_ASID 0xfffff0 +#define MIN_ASID 8 +#define ASID_INC 8 /* number of regions */ + +/* Generate a GRU asid value from a GRU base asid & a virtual address. */ +#if defined CONFIG_IA64 +#define VADDR_HI_BIT 64 +#define GRUREGION(addr) ((addr) >> (VADDR_HI_BIT - 3) & 3) +#elif defined CONFIG_X86_64 +#define VADDR_HI_BIT 48 +#define GRUREGION(addr) (0) /* ZZZ could do better */ +#else +#error "Unsupported architecture" +#endif +#define GRUASID(asid, addr) ((asid) + GRUREGION(addr)) + +/*------------------------------------------------------------------------------ + * File & VMS Tables + */ + +struct gru_state; + +/* + * This structure is pointed to from the mmstruct via the notifier pointer. + * There is one of these per address space. + */ +struct gru_mm_tracker { + unsigned int mt_asid_gen; /* ASID wrap count */ + int mt_asid; /* current base ASID for gru */ + unsigned short mt_ctxbitmap; /* bitmap of contexts using + asid */ +}; + +struct gru_mm_struct { + struct mmu_notifier ms_notifier; + atomic_t ms_refcnt; + spinlock_t ms_asid_lock; /* protects ASID assignment */ + atomic_t ms_range_active;/* num range_invals active */ + char ms_released; + wait_queue_head_t ms_wait_queue; + DECLARE_BITMAP(ms_asidmap, GRU_MAX_GRUS); + struct gru_mm_tracker ms_asids[GRU_MAX_GRUS]; +}; + +/* + * One of these structures is allocated when a GSEG is mmaped. The + * structure is pointed to by the vma->vm_private_data field in the vma struct. + */ +struct gru_vma_data { + spinlock_t vd_lock; /* Serialize access to vma */ + struct list_head vd_head; /* head of linked list of gts */ + long vd_user_options;/* misc user option flags */ + int vd_cbr_au_count; + int vd_dsr_au_count; +}; + +/* + * One of these is allocated for each thread accessing a mmaped GRU. A linked + * list of these structure is hung off the struct gru_vma_data in the mm_struct. + */ +struct gru_thread_state { + struct list_head ts_next; /* list - head at vma-private */ + struct mutex ts_ctxlock; /* load/unload CTX lock */ + struct mm_struct *ts_mm; /* mm currently mapped to + context */ + struct vm_area_struct *ts_vma; /* vma of GRU context */ + struct gru_state *ts_gru; /* GRU where the context is + loaded */ + struct gru_mm_struct *ts_gms; /* asid & ioproc struct */ + unsigned long ts_cbr_map; /* map of allocated CBRs */ + unsigned long ts_dsr_map; /* map of allocated DATA + resources */ + unsigned long ts_steal_jiffies;/* jiffies when context last + stolen */ + long ts_user_options;/* misc user option flags */ + pid_t ts_tgid_owner; /* task that is using the + context - for migration */ + int ts_tsid; /* thread that owns the + structure */ + int ts_tlb_int_select;/* target cpu if interrupts + enabled */ + int ts_ctxnum; /* context number where the + context is loaded */ + atomic_t ts_refcnt; /* reference count GTS */ + unsigned char ts_dsr_au_count;/* Number of DSR resources + required for contest */ + unsigned char ts_cbr_au_count;/* Number of CBR resources + required for contest */ + char ts_force_unload;/* force context to be unloaded + after migration */ + char ts_cbr_idx[GRU_CBR_AU];/* CBR numbers of each + allocated CB */ + unsigned long ts_gdata[0]; /* save area for GRU data (CB, + DS, CBE) */ +}; + +/* + * Threaded programs actually allocate an array of GSEGs when a context is + * created. Each thread uses a separate GSEG. TSID is the index into the GSEG + * array. + */ +#define TSID(a, v) (((a) - (v)->vm_start) / GRU_GSEG_PAGESIZE) +#define UGRUADDR(gts) ((gts)->ts_vma->vm_start + \ + (gts)->ts_tsid * GRU_GSEG_PAGESIZE) + +#define NULLCTX (-1) /* if context not loaded into GRU */ + +/*----------------------------------------------------------------------------- + * GRU State Tables + */ + +/* + * One of these exists for each GRU chiplet. + */ +struct gru_state { + struct gru_blade_state *gs_blade; /* GRU state for entire + blade */ + unsigned long gs_gru_base_paddr; /* Physical address of + gru segments (64) */ + void *gs_gru_base_vaddr; /* Virtual address of + gru segments (64) */ + unsigned char gs_gid; /* unique GRU number */ + unsigned char gs_tgh_local_shift; /* used to pick TGH for + local flush */ + unsigned char gs_tgh_first_remote; /* starting TGH# for + remote flush */ + unsigned short gs_blade_id; /* blade of GRU */ + spinlock_t gs_asid_lock; /* lock used for + assigning asids */ + spinlock_t gs_lock; /* lock used for + assigning contexts */ + + /* -- the following are protected by the gs_asid_lock spinlock ---- */ + unsigned int gs_asid; /* Next availe ASID */ + unsigned int gs_asid_limit; /* Limit of available + ASIDs */ + unsigned int gs_asid_gen; /* asid generation. + Inc on wrap */ + + /* --- the following fields are protected by the gs_lock spinlock --- */ + unsigned long gs_context_map; /* bitmap to manage + contexts in use */ + unsigned long gs_cbr_map; /* bitmap to manage CB + resources */ + unsigned long gs_dsr_map; /* bitmap used to manage + DATA resources */ + unsigned int gs_reserved_cbrs; /* Number of kernel- + reserved cbrs */ + unsigned int gs_reserved_dsr_bytes; /* Bytes of kernel- + reserved dsrs */ + unsigned short gs_active_contexts; /* number of contexts + in use */ + struct gru_thread_state *gs_gts[GRU_NUM_CCH]; /* GTS currently using + the context */ +}; + +/* + * This structure contains the GRU state for all the GRUs on a blade. + */ +struct gru_blade_state { + void *kernel_cb; /* First kernel + reserved cb */ + void *kernel_dsr; /* First kernel + reserved DSR */ + /* ---- the following are protected by the bs_lock spinlock ---- */ + spinlock_t bs_lock; /* lock used for + stealing contexts */ + int bs_lru_ctxnum; /* STEAL - last context + stolen */ + struct gru_state *bs_lru_gru; /* STEAL - last gru + stolen */ + + struct gru_state bs_grus[GRU_CHIPLETS_PER_BLADE]; +}; + +/*----------------------------------------------------------------------------- + * Address Primitives + */ +#define get_tfm_for_cpu(g, c) \ + ((struct gru_tlb_fault_map *)get_tfm((g)->gs_gru_base_vaddr, (c))) +#define get_tfh_by_index(g, i) \ + ((struct gru_tlb_fault_handle *)get_tfh((g)->gs_gru_base_vaddr, (i))) +#define get_tgh_by_index(g, i) \ + ((struct gru_tlb_global_handle *)get_tgh((g)->gs_gru_base_vaddr, (i))) +#define get_cbe_by_index(g, i) \ + ((struct gru_control_block_extended *)get_cbe((g)->gs_gru_base_vaddr,\ + (i))) + +/*----------------------------------------------------------------------------- + * Useful Macros + */ + +/* Given a blade# & chiplet#, get a pointer to the GRU */ +#define get_gru(b, c) (&gru_base[b]->bs_grus[c]) + +/* Number of bytes to save/restore when unloading/loading GRU contexts */ +#define DSR_BYTES(dsr) ((dsr) * GRU_DSR_AU_BYTES) +#define CBR_BYTES(cbr) ((cbr) * GRU_HANDLE_BYTES * GRU_CBR_AU_SIZE * 2) + +/* Convert a user CB number to the actual CBRNUM */ +#define thread_cbr_number(gts, n) ((gts)->ts_cbr_idx[(n) / GRU_CBR_AU_SIZE] \ + * GRU_CBR_AU_SIZE + (n) % GRU_CBR_AU_SIZE) + +/* Convert a gid to a pointer to the GRU */ +#define GID_TO_GRU(gid) \ + (gru_base[(gid) / GRU_CHIPLETS_PER_BLADE] ? \ + (&gru_base[(gid) / GRU_CHIPLETS_PER_BLADE]-> \ + bs_grus[(gid) % GRU_CHIPLETS_PER_BLADE]) : \ + NULL) + +/* Scan all active GRUs in a GRU bitmap */ +#define for_each_gru_in_bitmap(gid, map) \ + for ((gid) = find_first_bit((map), GRU_MAX_GRUS); (gid) < GRU_MAX_GRUS;\ + (gid)++, (gid) = find_next_bit((map), GRU_MAX_GRUS, (gid))) + +/* Scan all active GRUs on a specific blade */ +#define for_each_gru_on_blade(gru, nid, i) \ + for ((gru) = gru_base[nid]->bs_grus, (i) = 0; \ + (i) < GRU_CHIPLETS_PER_BLADE; \ + (i)++, (gru)++) + +/* Scan all active GTSs on a gru. Note: must hold ss_lock to use this macro. */ +#define for_each_gts_on_gru(gts, gru, ctxnum) \ + for ((ctxnum) = 0; (ctxnum) < GRU_NUM_CCH; (ctxnum)++) \ + if (((gts) = (gru)->gs_gts[ctxnum])) + +/* Scan each CBR whose bit is set in a TFM (or copy of) */ +#define for_each_cbr_in_tfm(i, map) \ + for ((i) = find_first_bit(map, GRU_NUM_CBE); \ + (i) < GRU_NUM_CBE; \ + (i)++, (i) = find_next_bit(map, GRU_NUM_CBE, i)) + +/* Scan each CBR in a CBR bitmap. Note: multiple CBRs in an allocation unit */ +#define for_each_cbr_in_allocation_map(i, map, k) \ + for ((k) = find_first_bit(map, GRU_CBR_AU); (k) < GRU_CBR_AU; \ + (k) = find_next_bit(map, GRU_CBR_AU, (k) + 1)) \ + for ((i) = (k)*GRU_CBR_AU_SIZE; \ + (i) < ((k) + 1) * GRU_CBR_AU_SIZE; (i)++) + +/* Scan each DSR in a DSR bitmap. Note: multiple DSRs in an allocation unit */ +#define for_each_dsr_in_allocation_map(i, map, k) \ + for ((k) = find_first_bit((const unsigned long *)map, GRU_DSR_AU);\ + (k) < GRU_DSR_AU; \ + (k) = find_next_bit((const unsigned long *)map, \ + GRU_DSR_AU, (k) + 1)) \ + for ((i) = (k) * GRU_DSR_AU_CL; \ + (i) < ((k) + 1) * GRU_DSR_AU_CL; (i)++) + +#define gseg_physical_address(gru, ctxnum) \ + ((gru)->gs_gru_base_paddr + ctxnum * GRU_GSEG_STRIDE) +#define gseg_virtual_address(gru, ctxnum) \ + ((gru)->gs_gru_base_vaddr + ctxnum * GRU_GSEG_STRIDE) + +/*----------------------------------------------------------------------------- + * Lock / Unlock GRU handles + * Use the "delresp" bit in the handle as a "lock" bit. + */ + +/* Lock hierarchy checking enabled only in emulator */ + +static inline void __lock_handle(void *h) +{ + while (test_and_set_bit(1, h)) + cpu_relax(); +} + +static inline void __unlock_handle(void *h) +{ + clear_bit(1, h); +} + +static inline void lock_cch_handle(struct gru_context_configuration_handle *cch) +{ + __lock_handle(cch); +} + +static inline void unlock_cch_handle(struct gru_context_configuration_handle + *cch) +{ + __unlock_handle(cch); +} + +static inline void lock_tgh_handle(struct gru_tlb_global_handle *tgh) +{ + __lock_handle(tgh); +} + +static inline void unlock_tgh_handle(struct gru_tlb_global_handle *tgh) +{ + __unlock_handle(tgh); +} + +/*----------------------------------------------------------------------------- + * Function prototypes & externs + */ +struct gru_unload_context_req; + +extern struct vm_operations_struct gru_vm_ops; +extern struct device *grudev; + +extern struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma, + int tsid); +extern struct gru_thread_state *gru_find_thread_state(struct vm_area_struct + *vma, int tsid); +extern struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct + *vma, int tsid); +extern void gru_unload_context(struct gru_thread_state *gts, int savestate); +extern void gts_drop(struct gru_thread_state *gts); +extern void gru_tgh_flush_init(struct gru_state *gru); +extern int gru_kservices_init(struct gru_state *gru); +extern irqreturn_t gru_intr(int irq, void *dev_id); +extern int gru_handle_user_call_os(unsigned long address); +extern int gru_user_flush_tlb(unsigned long arg); +extern int gru_user_unload_context(unsigned long arg); +extern int gru_get_exception_detail(unsigned long arg); +extern int gru_set_task_slice(long address); +extern int gru_cpu_fault_map_id(void); +extern struct vm_area_struct *gru_find_vma(unsigned long vaddr); +extern void gru_flush_all_tlb(struct gru_state *gru); +extern int gru_proc_init(void); +extern void gru_proc_exit(void); + +extern unsigned long gru_reserve_cb_resources(struct gru_state *gru, + int cbr_au_count, char *cbmap); +extern unsigned long gru_reserve_ds_resources(struct gru_state *gru, + int dsr_au_count, char *dsmap); +extern int gru_fault(struct vm_area_struct *, struct vm_fault *vmf); +extern struct gru_mm_struct *gru_register_mmu_notifier(void); +extern void gru_drop_mmu_notifier(struct gru_mm_struct *gms); + +extern void gru_flush_tlb_range(struct gru_mm_struct *gms, unsigned long start, + unsigned long len); + +extern unsigned long gru_options; + +#endif /* __GRUTABLES_H__ */ diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c new file mode 100644 index 00000000000..c84496a7769 --- /dev/null +++ b/drivers/misc/sgi-gru/grutlbpurge.c @@ -0,0 +1,371 @@ +/* + * SN Platform GRU Driver + * + * MMUOPS callbacks + TLB flushing + * + * This file handles emu notifier callbacks from the core kernel. The callbacks + * are used to update the TLB in the GRU as a result of changes in the + * state of a process address space. This file also handles TLB invalidates + * from the GRU driver. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/hugetlb.h> +#include <linux/delay.h> +#include <linux/timex.h> +#include <linux/srcu.h> +#include <asm/processor.h> +#include "gru.h" +#include "grutables.h" +#include <asm/uv/uv_hub.h> + +#define gru_random() get_cycles() + +/* ---------------------------------- TLB Invalidation functions -------- + * get_tgh_handle + * + * Find a TGH to use for issuing a TLB invalidate. For GRUs that are on the + * local blade, use a fixed TGH that is a function of the blade-local cpu + * number. Normally, this TGH is private to the cpu & no contention occurs for + * the TGH. For offblade GRUs, select a random TGH in the range above the + * private TGHs. A spinlock is required to access this TGH & the lock must be + * released when the invalidate is completes. This sucks, but it is the best we + * can do. + * + * Note that the spinlock is IN the TGH handle so locking does not involve + * additional cache lines. + * + */ +static inline int get_off_blade_tgh(struct gru_state *gru) +{ + int n; + + n = GRU_NUM_TGH - gru->gs_tgh_first_remote; + n = gru_random() % n; + n += gru->gs_tgh_first_remote; + return n; +} + +static inline int get_on_blade_tgh(struct gru_state *gru) +{ + return uv_blade_processor_id() >> gru->gs_tgh_local_shift; +} + +static struct gru_tlb_global_handle *get_lock_tgh_handle(struct gru_state + *gru) +{ + struct gru_tlb_global_handle *tgh; + int n; + + preempt_disable(); + if (uv_numa_blade_id() == gru->gs_blade_id) + n = get_on_blade_tgh(gru); + else + n = get_off_blade_tgh(gru); + tgh = get_tgh_by_index(gru, n); + lock_tgh_handle(tgh); + + return tgh; +} + +static void get_unlock_tgh_handle(struct gru_tlb_global_handle *tgh) +{ + unlock_tgh_handle(tgh); + preempt_enable(); +} + +/* + * gru_flush_tlb_range + * + * General purpose TLB invalidation function. This function scans every GRU in + * the ENTIRE system (partition) looking for GRUs where the specified MM has + * been accessed by the GRU. For each GRU found, the TLB must be invalidated OR + * the ASID invalidated. Invalidating an ASID causes a new ASID to be assigned + * on the next fault. This effectively flushes the ENTIRE TLB for the MM at the + * cost of (possibly) a large number of future TLBmisses. + * + * The current algorithm is optimized based on the following (somewhat true) + * assumptions: + * - GRU contexts are not loaded into a GRU unless a reference is made to + * the data segment or control block (this is true, not an assumption). + * If a DS/CB is referenced, the user will also issue instructions that + * cause TLBmisses. It is not necessary to optimize for the case where + * contexts are loaded but no instructions cause TLB misses. (I know + * this will happen but I'm not optimizing for it). + * - GRU instructions to invalidate TLB entries are SLOOOOWWW - normally + * a few usec but in unusual cases, it could be longer. Avoid if + * possible. + * - intrablade process migration between cpus is not frequent but is + * common. + * - a GRU context is not typically migrated to a different GRU on the + * blade because of intrablade migration + * - interblade migration is rare. Processes migrate their GRU context to + * the new blade. + * - if interblade migration occurs, migration back to the original blade + * is very very rare (ie., no optimization for this case) + * - most GRU instruction operate on a subset of the user REGIONS. Code + * & shared library regions are not likely targets of GRU instructions. + * + * To help improve the efficiency of TLB invalidation, the GMS data + * structure is maintained for EACH address space (MM struct). The GMS is + * also the structure that contains the pointer to the mmu callout + * functions. This structure is linked to the mm_struct for the address space + * using the mmu "register" function. The mmu interfaces are used to + * provide the callbacks for TLB invalidation. The GMS contains: + * + * - asid[maxgrus] array. ASIDs are assigned to a GRU when a context is + * loaded into the GRU. + * - asidmap[maxgrus]. bitmap to make it easier to find non-zero asids in + * the above array + * - ctxbitmap[maxgrus]. Indicates the contexts that are currently active + * in the GRU for the address space. This bitmap must be passed to the + * GRU to do an invalidate. + * + * The current algorithm for invalidating TLBs is: + * - scan the asidmap for GRUs where the context has been loaded, ie, + * asid is non-zero. + * - for each gru found: + * - if the ctxtmap is non-zero, there are active contexts in the + * GRU. TLB invalidate instructions must be issued to the GRU. + * - if the ctxtmap is zero, no context is active. Set the ASID to + * zero to force a full TLB invalidation. This is fast but will + * cause a lot of TLB misses if the context is reloaded onto the + * GRU + * + */ + +void gru_flush_tlb_range(struct gru_mm_struct *gms, unsigned long start, + unsigned long len) +{ + struct gru_state *gru; + struct gru_mm_tracker *asids; + struct gru_tlb_global_handle *tgh; + unsigned long num; + int grupagesize, pagesize, pageshift, gid, asid; + + /* ZZZ TODO - handle huge pages */ + pageshift = PAGE_SHIFT; + pagesize = (1UL << pageshift); + grupagesize = GRU_PAGESIZE(pageshift); + num = min(((len + pagesize - 1) >> pageshift), GRUMAXINVAL); + + STAT(flush_tlb); + gru_dbg(grudev, "gms %p, start 0x%lx, len 0x%lx, asidmap 0x%lx\n", gms, + start, len, gms->ms_asidmap[0]); + + spin_lock(&gms->ms_asid_lock); + for_each_gru_in_bitmap(gid, gms->ms_asidmap) { + STAT(flush_tlb_gru); + gru = GID_TO_GRU(gid); + asids = gms->ms_asids + gid; + asid = asids->mt_asid; + if (asids->mt_ctxbitmap && asid) { + STAT(flush_tlb_gru_tgh); + asid = GRUASID(asid, start); + gru_dbg(grudev, + " FLUSH gruid %d, asid 0x%x, num %ld, cbmap 0x%x\n", + gid, asid, num, asids->mt_ctxbitmap); + tgh = get_lock_tgh_handle(gru); + tgh_invalidate(tgh, start, 0, asid, grupagesize, 0, + num - 1, asids->mt_ctxbitmap); + get_unlock_tgh_handle(tgh); + } else { + STAT(flush_tlb_gru_zero_asid); + asids->mt_asid = 0; + __clear_bit(gru->gs_gid, gms->ms_asidmap); + gru_dbg(grudev, + " CLEARASID gruid %d, asid 0x%x, cbtmap 0x%x, asidmap 0x%lx\n", + gid, asid, asids->mt_ctxbitmap, + gms->ms_asidmap[0]); + } + } + spin_unlock(&gms->ms_asid_lock); +} + +/* + * Flush the entire TLB on a chiplet. + */ +void gru_flush_all_tlb(struct gru_state *gru) +{ + struct gru_tlb_global_handle *tgh; + + gru_dbg(grudev, "gru %p, gid %d\n", gru, gru->gs_gid); + tgh = get_lock_tgh_handle(gru); + tgh_invalidate(tgh, 0, ~0, 0, 1, 1, GRUMAXINVAL - 1, 0); + get_unlock_tgh_handle(tgh); + preempt_enable(); +} + +/* + * MMUOPS notifier callout functions + */ +static void gru_invalidate_range_start(struct mmu_notifier *mn, + struct mm_struct *mm, + unsigned long start, unsigned long end) +{ + struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct, + ms_notifier); + + STAT(mmu_invalidate_range); + atomic_inc(&gms->ms_range_active); + gru_dbg(grudev, "gms %p, start 0x%lx, end 0x%lx, act %d\n", gms, + start, end, atomic_read(&gms->ms_range_active)); + gru_flush_tlb_range(gms, start, end - start); +} + +static void gru_invalidate_range_end(struct mmu_notifier *mn, + struct mm_struct *mm, unsigned long start, + unsigned long end) +{ + struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct, + ms_notifier); + + /* ..._and_test() provides needed barrier */ + (void)atomic_dec_and_test(&gms->ms_range_active); + + wake_up_all(&gms->ms_wait_queue); + gru_dbg(grudev, "gms %p, start 0x%lx, end 0x%lx\n", gms, start, end); +} + +static void gru_invalidate_page(struct mmu_notifier *mn, struct mm_struct *mm, + unsigned long address) +{ + struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct, + ms_notifier); + + STAT(mmu_invalidate_page); + gru_flush_tlb_range(gms, address, PAGE_SIZE); + gru_dbg(grudev, "gms %p, address 0x%lx\n", gms, address); +} + +static void gru_release(struct mmu_notifier *mn, struct mm_struct *mm) +{ + struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct, + ms_notifier); + + gms->ms_released = 1; + gru_dbg(grudev, "gms %p\n", gms); +} + + +static const struct mmu_notifier_ops gru_mmuops = { + .invalidate_page = gru_invalidate_page, + .invalidate_range_start = gru_invalidate_range_start, + .invalidate_range_end = gru_invalidate_range_end, + .release = gru_release, +}; + +/* Move this to the basic mmu_notifier file. But for now... */ +static struct mmu_notifier *mmu_find_ops(struct mm_struct *mm, + const struct mmu_notifier_ops *ops) +{ + struct mmu_notifier *mn, *gru_mn = NULL; + struct hlist_node *n; + + if (mm->mmu_notifier_mm) { + rcu_read_lock(); + hlist_for_each_entry_rcu(mn, n, &mm->mmu_notifier_mm->list, + hlist) + if (mn->ops == ops) { + gru_mn = mn; + break; + } + rcu_read_unlock(); + } + return gru_mn; +} + +struct gru_mm_struct *gru_register_mmu_notifier(void) +{ + struct gru_mm_struct *gms; + struct mmu_notifier *mn; + + mn = mmu_find_ops(current->mm, &gru_mmuops); + if (mn) { + gms = container_of(mn, struct gru_mm_struct, ms_notifier); + atomic_inc(&gms->ms_refcnt); + } else { + gms = kzalloc(sizeof(*gms), GFP_KERNEL); + if (gms) { + spin_lock_init(&gms->ms_asid_lock); + gms->ms_notifier.ops = &gru_mmuops; + atomic_set(&gms->ms_refcnt, 1); + init_waitqueue_head(&gms->ms_wait_queue); + __mmu_notifier_register(&gms->ms_notifier, current->mm); + } + } + gru_dbg(grudev, "gms %p, refcnt %d\n", gms, + atomic_read(&gms->ms_refcnt)); + return gms; +} + +void gru_drop_mmu_notifier(struct gru_mm_struct *gms) +{ + gru_dbg(grudev, "gms %p, refcnt %d, released %d\n", gms, + atomic_read(&gms->ms_refcnt), gms->ms_released); + if (atomic_dec_return(&gms->ms_refcnt) == 0) { + if (!gms->ms_released) + mmu_notifier_unregister(&gms->ms_notifier, current->mm); + kfree(gms); + } +} + +/* + * Setup TGH parameters. There are: + * - 24 TGH handles per GRU chiplet + * - a portion (MAX_LOCAL_TGH) of the handles are reserved for + * use by blade-local cpus + * - the rest are used by off-blade cpus. This usage is + * less frequent than blade-local usage. + * + * For now, use 16 handles for local flushes, 8 for remote flushes. If the blade + * has less tan or equal to 16 cpus, each cpu has a unique handle that it can + * use. + */ +#define MAX_LOCAL_TGH 16 + +void gru_tgh_flush_init(struct gru_state *gru) +{ + int cpus, shift = 0, n; + + cpus = uv_blade_nr_possible_cpus(gru->gs_blade_id); + + /* n = cpus rounded up to next power of 2 */ + if (cpus) { + n = 1 << fls(cpus - 1); + + /* + * shift count for converting local cpu# to TGH index + * 0 if cpus <= MAX_LOCAL_TGH, + * 1 if cpus <= 2*MAX_LOCAL_TGH, + * etc + */ + shift = max(0, fls(n - 1) - fls(MAX_LOCAL_TGH - 1)); + } + gru->gs_tgh_local_shift = shift; + + /* first starting TGH index to use for remote purges */ + gru->gs_tgh_first_remote = (cpus + (1 << shift) - 1) >> shift; + +} diff --git a/drivers/misc/sgi-xp/Makefile b/drivers/misc/sgi-xp/Makefile index b6e40a7958c..35ce2857807 100644 --- a/drivers/misc/sgi-xp/Makefile +++ b/drivers/misc/sgi-xp/Makefile @@ -3,9 +3,17 @@ # obj-$(CONFIG_SGI_XP) += xp.o -xp-y := xp_main.o xp_nofault.o +xp-y := xp_main.o +xp-$(CONFIG_IA64_SGI_SN2) += xp_sn2.o xp_nofault.o +xp-$(CONFIG_IA64_GENERIC) += xp_sn2.o xp_nofault.o xp_uv.o +xp-$(CONFIG_IA64_SGI_UV) += xp_uv.o +xp-$(CONFIG_X86_64) += xp_uv.o obj-$(CONFIG_SGI_XP) += xpc.o xpc-y := xpc_main.o xpc_channel.o xpc_partition.o +xpc-$(CONFIG_IA64_SGI_SN2) += xpc_sn2.o +xpc-$(CONFIG_IA64_GENERIC) += xpc_sn2.o xpc_uv.o +xpc-$(CONFIG_IA64_SGI_UV) += xpc_uv.o +xpc-$(CONFIG_X86_64) += xpc_uv.o obj-$(CONFIG_SGI_XP) += xpnet.o diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h index 03a87a307e3..859a5281c61 100644 --- a/drivers/misc/sgi-xp/xp.h +++ b/drivers/misc/sgi-xp/xp.h @@ -13,11 +13,34 @@ #ifndef _DRIVERS_MISC_SGIXP_XP_H #define _DRIVERS_MISC_SGIXP_XP_H -#include <linux/cache.h> -#include <linux/hardirq.h> #include <linux/mutex.h> -#include <asm/sn/types.h> -#include <asm/sn/bte.h> + +#ifdef CONFIG_IA64 +#include <asm/system.h> +#include <asm/sn/arch.h> /* defines is_shub1() and is_shub2() */ +#define is_shub() ia64_platform_is("sn2") +#define is_uv() ia64_platform_is("uv") +#endif +#ifdef CONFIG_X86_64 +#include <asm/genapic.h> +#define is_uv() is_uv_system() +#endif + +#ifndef is_shub1 +#define is_shub1() 0 +#endif + +#ifndef is_shub2 +#define is_shub2() 0 +#endif + +#ifndef is_shub +#define is_shub() 0 +#endif + +#ifndef is_uv +#define is_uv() 0 +#endif #ifdef USE_DBUG_ON #define DBUG_ON(condition) BUG_ON(condition) @@ -26,133 +49,56 @@ #endif /* - * Define the maximum number of logically defined partitions the system - * can support. It is constrained by the maximum number of hardware - * partitionable regions. The term 'region' in this context refers to the - * minimum number of nodes that can comprise an access protection grouping. - * The access protection is in regards to memory, IPI and IOI. + * Define the maximum number of partitions the system can possibly support. + * It is based on the maximum number of hardware partitionable regions. The + * term 'region' in this context refers to the minimum number of nodes that + * can comprise an access protection grouping. The access protection is in + * regards to memory, IPI and IOI. * * The maximum number of hardware partitionable regions is equal to the * maximum number of nodes in the entire system divided by the minimum number * of nodes that comprise an access protection grouping. */ -#define XP_MAX_PARTITIONS 64 - -/* - * Define the number of u64s required to represent all the C-brick nasids - * as a bitmap. The cross-partition kernel modules deal only with - * C-brick nasids, thus the need for bitmaps which don't account for - * odd-numbered (non C-brick) nasids. - */ -#define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2) -#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8) -#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64) - -/* - * Wrapper for bte_copy() that should it return a failure status will retry - * the bte_copy() once in the hope that the failure was due to a temporary - * aberration (i.e., the link going down temporarily). - * - * src - physical address of the source of the transfer. - * vdst - virtual address of the destination of the transfer. - * len - number of bytes to transfer from source to destination. - * mode - see bte_copy() for definition. - * notification - see bte_copy() for definition. - * - * Note: xp_bte_copy() should never be called while holding a spinlock. - */ -static inline bte_result_t -xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification) -{ - bte_result_t ret; - u64 pdst = ia64_tpa(vdst); - - /* - * Ensure that the physically mapped memory is contiguous. - * - * We do this by ensuring that the memory is from region 7 only. - * If the need should arise to use memory from one of the other - * regions, then modify the BUG_ON() statement to ensure that the - * memory from that region is always physically contiguous. - */ - BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL); - - ret = bte_copy(src, pdst, len, mode, notification); - if ((ret != BTE_SUCCESS) && BTE_ERROR_RETRY(ret)) { - if (!in_interrupt()) - cond_resched(); - - ret = bte_copy(src, pdst, len, mode, notification); - } - - return ret; -} +#define XP_MAX_NPARTITIONS_SN2 64 +#define XP_MAX_NPARTITIONS_UV 256 /* * XPC establishes channel connections between the local partition and any * other partition that is currently up. Over these channels, kernel-level * `users' can communicate with their counterparts on the other partitions. * - * The maxinum number of channels is limited to eight. For performance reasons, - * the internal cross partition structures require sixteen bytes per channel, - * and eight allows all of this interface-shared info to fit in one cache line. - * - * XPC_NCHANNELS reflects the total number of channels currently defined. * If the need for additional channels arises, one can simply increase - * XPC_NCHANNELS accordingly. If the day should come where that number - * exceeds the MAXIMUM number of channels allowed (eight), then one will need - * to make changes to the XPC code to allow for this. + * XPC_MAX_NCHANNELS accordingly. If the day should come where that number + * exceeds the absolute MAXIMUM number of channels possible (eight), then one + * will need to make changes to the XPC code to accommodate for this. + * + * The absolute maximum number of channels possible is limited to eight for + * performance reasons on sn2 hardware. The internal cross partition structures + * require sixteen bytes per channel, and eight allows all of this + * interface-shared info to fit in one 128-byte cacheline. */ #define XPC_MEM_CHANNEL 0 /* memory channel number */ #define XPC_NET_CHANNEL 1 /* network channel number */ -#define XPC_NCHANNELS 2 /* #of defined channels */ -#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */ +#define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */ -#if XPC_NCHANNELS > XPC_MAX_NCHANNELS -#error XPC_NCHANNELS exceeds MAXIMUM allowed. +#if XPC_MAX_NCHANNELS > 8 +#error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible. #endif /* - * The format of an XPC message is as follows: - * - * +-------+--------------------------------+ - * | flags |////////////////////////////////| - * +-------+--------------------------------+ - * | message # | - * +----------------------------------------+ - * | payload (user-defined message) | - * | | - * : - * | | - * +----------------------------------------+ - * - * The size of the payload is defined by the user via xpc_connect(). A user- - * defined message resides in the payload area. - * - * The user should have no dealings with the message header, but only the - * message's payload. When a message entry is allocated (via xpc_allocate()) - * a pointer to the payload area is returned and not the actual beginning of - * the XPC message. The user then constructs a message in the payload area - * and passes that pointer as an argument on xpc_send() or xpc_send_notify(). - * - * The size of a message entry (within a message queue) must be a cacheline - * sized multiple in order to facilitate the BTE transfer of messages from one - * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user + * Define macro, XPC_MSG_SIZE(), is provided for the user * that wants to fit as many msg entries as possible in a given memory size * (e.g. a memory page). */ -struct xpc_msg { - u8 flags; /* FOR XPC INTERNAL USE ONLY */ - u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */ - s64 number; /* FOR XPC INTERNAL USE ONLY */ - - u64 payload; /* user defined portion of message */ -}; +#define XPC_MSG_MAX_SIZE 128 +#define XPC_MSG_HDR_MAX_SIZE 16 +#define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) -#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload) #define XPC_MSG_SIZE(_payload_size) \ - L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size)) + ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ + is_uv() ? 64 : 128) + /* * Define the return values and values passed to user's callout functions. @@ -233,8 +179,20 @@ enum xp_retval { xpDisconnected, /* 51: channel disconnected (closed) */ xpBteCopyError, /* 52: bte_copy() returned error */ + xpSalError, /* 53: sn SAL error */ + xpRsvdPageNotSet, /* 54: the reserved page is not set up */ + xpPayloadTooBig, /* 55: payload too large for message slot */ + + xpUnsupported, /* 56: unsupported functionality or resource */ + xpNeedMoreInfo, /* 57: more info is needed by SAL */ - xpUnknownReason /* 53: unknown reason - must be last in enum */ + xpGruCopyError, /* 58: gru_copy_gru() returned error */ + xpGruSendMqError, /* 59: gru send message queue related error */ + + xpBadChannelNumber, /* 60: invalid channel number */ + xpBadMsgType, /* 60: invalid message type */ + + xpUnknownReason /* 61: unknown reason - must be last in enum */ }; /* @@ -285,6 +243,9 @@ typedef void (*xpc_channel_func) (enum xp_retval reason, short partid, * calling xpc_received(). * * All other reason codes indicate failure. + * + * NOTE: The user defined function must be callable by an interrupt handler + * and thus cannot block. */ typedef void (*xpc_notify_func) (enum xp_retval reason, short partid, int ch_number, void *key); @@ -308,23 +269,22 @@ struct xpc_registration { xpc_channel_func func; /* function to call */ void *key; /* pointer to user's key */ u16 nentries; /* #of msg entries in local msg queue */ - u16 msg_size; /* message queue's message size */ + u16 entry_size; /* message queue's message entry size */ u32 assigned_limit; /* limit on #of assigned kthreads */ u32 idle_limit; /* limit on #of idle kthreads */ } ____cacheline_aligned; #define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL) -/* the following are valid xpc_allocate() flags */ +/* the following are valid xpc_send() or xpc_send_notify() flags */ #define XPC_WAIT 0 /* wait flag */ #define XPC_NOWAIT 1 /* no wait flag */ struct xpc_interface { void (*connect) (int); void (*disconnect) (int); - enum xp_retval (*allocate) (short, int, u32, void **); - enum xp_retval (*send) (short, int, void *); - enum xp_retval (*send_notify) (short, int, void *, + enum xp_retval (*send) (short, int, u32, void *, u16); + enum xp_retval (*send_notify) (short, int, u32, void *, u16, xpc_notify_func, void *); void (*received) (short, int, void *); enum xp_retval (*partid_to_nasids) (short, void *); @@ -334,10 +294,9 @@ extern struct xpc_interface xpc_interface; extern void xpc_set_interface(void (*)(int), void (*)(int), - enum xp_retval (*)(short, int, u32, void **), - enum xp_retval (*)(short, int, void *), - enum xp_retval (*)(short, int, void *, - xpc_notify_func, void *), + enum xp_retval (*)(short, int, u32, void *, u16), + enum xp_retval (*)(short, int, u32, void *, u16, + xpc_notify_func, void *), void (*)(short, int, void *), enum xp_retval (*)(short, void *)); extern void xpc_clear_interface(void); @@ -347,22 +306,19 @@ extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16, extern void xpc_disconnect(int); static inline enum xp_retval -xpc_allocate(short partid, int ch_number, u32 flags, void **payload) -{ - return xpc_interface.allocate(partid, ch_number, flags, payload); -} - -static inline enum xp_retval -xpc_send(short partid, int ch_number, void *payload) +xpc_send(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size) { - return xpc_interface.send(partid, ch_number, payload); + return xpc_interface.send(partid, ch_number, flags, payload, + payload_size); } static inline enum xp_retval -xpc_send_notify(short partid, int ch_number, void *payload, - xpc_notify_func func, void *key) +xpc_send_notify(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size, xpc_notify_func func, void *key) { - return xpc_interface.send_notify(partid, ch_number, payload, func, key); + return xpc_interface.send_notify(partid, ch_number, flags, payload, + payload_size, func, key); } static inline void @@ -377,8 +333,23 @@ xpc_partid_to_nasids(short partid, void *nasids) return xpc_interface.partid_to_nasids(partid, nasids); } +extern short xp_max_npartitions; +extern short xp_partition_id; +extern u8 xp_region_size; + +extern unsigned long (*xp_pa) (void *); +extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long, + size_t); +extern int (*xp_cpu_to_nasid) (int); + extern u64 xp_nofault_PIOR_target; extern int xp_nofault_PIOR(void *); extern int xp_error_PIOR(void); +extern struct device *xp; +extern enum xp_retval xp_init_sn2(void); +extern enum xp_retval xp_init_uv(void); +extern void xp_exit_sn2(void); +extern void xp_exit_uv(void); + #endif /* _DRIVERS_MISC_SGIXP_XP_H */ diff --git a/drivers/misc/sgi-xp/xp_main.c b/drivers/misc/sgi-xp/xp_main.c index 196480b691a..66a1d19e08a 100644 --- a/drivers/misc/sgi-xp/xp_main.c +++ b/drivers/misc/sgi-xp/xp_main.c @@ -14,29 +14,48 @@ * */ -#include <linux/kernel.h> -#include <linux/interrupt.h> #include <linux/module.h> -#include <linux/mutex.h> -#include <asm/sn/intr.h> -#include <asm/sn/sn_sal.h> +#include <linux/device.h> #include "xp.h" -/* - * The export of xp_nofault_PIOR needs to happen here since it is defined - * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is - * defined here. - */ -EXPORT_SYMBOL_GPL(xp_nofault_PIOR); +/* define the XP debug device structures to be used with dev_dbg() et al */ + +struct device_driver xp_dbg_name = { + .name = "xp" +}; + +struct device xp_dbg_subname = { + .bus_id = {0}, /* set to "" */ + .driver = &xp_dbg_name +}; + +struct device *xp = &xp_dbg_subname; + +/* max #of partitions possible */ +short xp_max_npartitions; +EXPORT_SYMBOL_GPL(xp_max_npartitions); + +short xp_partition_id; +EXPORT_SYMBOL_GPL(xp_partition_id); + +u8 xp_region_size; +EXPORT_SYMBOL_GPL(xp_region_size); + +unsigned long (*xp_pa) (void *addr); +EXPORT_SYMBOL_GPL(xp_pa); + +enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa, + const unsigned long src_gpa, size_t len); +EXPORT_SYMBOL_GPL(xp_remote_memcpy); -u64 xp_nofault_PIOR_target; -EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target); +int (*xp_cpu_to_nasid) (int cpuid); +EXPORT_SYMBOL_GPL(xp_cpu_to_nasid); /* * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level * users of XPC. */ -struct xpc_registration xpc_registrations[XPC_NCHANNELS]; +struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS]; EXPORT_SYMBOL_GPL(xpc_registrations); /* @@ -51,10 +70,9 @@ xpc_notloaded(void) struct xpc_interface xpc_interface = { (void (*)(int))xpc_notloaded, (void (*)(int))xpc_notloaded, - (enum xp_retval(*)(short, int, u32, void **))xpc_notloaded, - (enum xp_retval(*)(short, int, void *))xpc_notloaded, - (enum xp_retval(*)(short, int, void *, xpc_notify_func, void *)) - xpc_notloaded, + (enum xp_retval(*)(short, int, u32, void *, u16))xpc_notloaded, + (enum xp_retval(*)(short, int, u32, void *, u16, xpc_notify_func, + void *))xpc_notloaded, (void (*)(short, int, void *))xpc_notloaded, (enum xp_retval(*)(short, void *))xpc_notloaded }; @@ -66,16 +84,14 @@ EXPORT_SYMBOL_GPL(xpc_interface); void xpc_set_interface(void (*connect) (int), void (*disconnect) (int), - enum xp_retval (*allocate) (short, int, u32, void **), - enum xp_retval (*send) (short, int, void *), - enum xp_retval (*send_notify) (short, int, void *, + enum xp_retval (*send) (short, int, u32, void *, u16), + enum xp_retval (*send_notify) (short, int, u32, void *, u16, xpc_notify_func, void *), void (*received) (short, int, void *), enum xp_retval (*partid_to_nasids) (short, void *)) { xpc_interface.connect = connect; xpc_interface.disconnect = disconnect; - xpc_interface.allocate = allocate; xpc_interface.send = send; xpc_interface.send_notify = send_notify; xpc_interface.received = received; @@ -91,13 +107,11 @@ xpc_clear_interface(void) { xpc_interface.connect = (void (*)(int))xpc_notloaded; xpc_interface.disconnect = (void (*)(int))xpc_notloaded; - xpc_interface.allocate = (enum xp_retval(*)(short, int, u32, - void **))xpc_notloaded; - xpc_interface.send = (enum xp_retval(*)(short, int, void *)) + xpc_interface.send = (enum xp_retval(*)(short, int, u32, void *, u16)) xpc_notloaded; - xpc_interface.send_notify = (enum xp_retval(*)(short, int, void *, - xpc_notify_func, - void *))xpc_notloaded; + xpc_interface.send_notify = (enum xp_retval(*)(short, int, u32, void *, + u16, xpc_notify_func, + void *))xpc_notloaded; xpc_interface.received = (void (*)(short, int, void *)) xpc_notloaded; xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *)) @@ -135,11 +149,14 @@ xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size, { struct xpc_registration *registration; - DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); DBUG_ON(payload_size == 0 || nentries == 0); DBUG_ON(func == NULL); DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); + if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE) + return xpPayloadTooBig; + registration = &xpc_registrations[ch_number]; if (mutex_lock_interruptible(®istration->mutex) != 0) @@ -152,7 +169,7 @@ xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size, } /* register the channel for connection */ - registration->msg_size = XPC_MSG_SIZE(payload_size); + registration->entry_size = XPC_MSG_SIZE(payload_size); registration->nentries = nentries; registration->assigned_limit = assigned_limit; registration->idle_limit = idle_limit; @@ -185,7 +202,7 @@ xpc_disconnect(int ch_number) { struct xpc_registration *registration; - DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); registration = &xpc_registrations[ch_number]; @@ -206,7 +223,7 @@ xpc_disconnect(int ch_number) registration->func = NULL; registration->key = NULL; registration->nentries = 0; - registration->msg_size = 0; + registration->entry_size = 0; registration->assigned_limit = 0; registration->idle_limit = 0; @@ -221,39 +238,21 @@ EXPORT_SYMBOL_GPL(xpc_disconnect); int __init xp_init(void) { - int ret, ch_number; - u64 func_addr = *(u64 *)xp_nofault_PIOR; - u64 err_func_addr = *(u64 *)xp_error_PIOR; - - if (!ia64_platform_is("sn2")) - return -ENODEV; + enum xp_retval ret; + int ch_number; - /* - * Register a nofault code region which performs a cross-partition - * PIO read. If the PIO read times out, the MCA handler will consume - * the error and return to a kernel-provided instruction to indicate - * an error. This PIO read exists because it is guaranteed to timeout - * if the destination is down (AMO operations do not timeout on at - * least some CPUs on Shubs <= v1.2, which unfortunately we have to - * work around). - */ - ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr, - 1, 1); - if (ret != 0) { - printk(KERN_ERR "XP: can't register nofault code, error=%d\n", - ret); - } - /* - * Setup the nofault PIO read target. (There is no special reason why - * SH_IPI_ACCESS was selected.) - */ - if (is_shub2()) - xp_nofault_PIOR_target = SH2_IPI_ACCESS0; + if (is_shub()) + ret = xp_init_sn2(); + else if (is_uv()) + ret = xp_init_uv(); else - xp_nofault_PIOR_target = SH1_IPI_ACCESS; + ret = xpUnsupported; + + if (ret != xpSuccess) + return -ENODEV; /* initialize the connection registration mutex */ - for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) + for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) mutex_init(&xpc_registrations[ch_number].mutex); return 0; @@ -264,12 +263,10 @@ module_init(xp_init); void __exit xp_exit(void) { - u64 func_addr = *(u64 *)xp_nofault_PIOR; - u64 err_func_addr = *(u64 *)xp_error_PIOR; - - /* unregister the PIO read nofault code region */ - (void)sn_register_nofault_code(func_addr, err_func_addr, - err_func_addr, 1, 0); + if (is_shub()) + xp_exit_sn2(); + else if (is_uv()) + xp_exit_uv(); } module_exit(xp_exit); diff --git a/drivers/misc/sgi-xp/xp_sn2.c b/drivers/misc/sgi-xp/xp_sn2.c new file mode 100644 index 00000000000..1440134caf3 --- /dev/null +++ b/drivers/misc/sgi-xp/xp_sn2.c @@ -0,0 +1,146 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +/* + * Cross Partition (XP) sn2-based functions. + * + * Architecture specific implementation of common functions. + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <asm/sn/bte.h> +#include <asm/sn/sn_sal.h> +#include "xp.h" + +/* + * The export of xp_nofault_PIOR needs to happen here since it is defined + * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is + * defined here. + */ +EXPORT_SYMBOL_GPL(xp_nofault_PIOR); + +u64 xp_nofault_PIOR_target; +EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target); + +/* + * Register a nofault code region which performs a cross-partition PIO read. + * If the PIO read times out, the MCA handler will consume the error and + * return to a kernel-provided instruction to indicate an error. This PIO read + * exists because it is guaranteed to timeout if the destination is down + * (amo operations do not timeout on at least some CPUs on Shubs <= v1.2, + * which unfortunately we have to work around). + */ +static enum xp_retval +xp_register_nofault_code_sn2(void) +{ + int ret; + u64 func_addr; + u64 err_func_addr; + + func_addr = *(u64 *)xp_nofault_PIOR; + err_func_addr = *(u64 *)xp_error_PIOR; + ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr, + 1, 1); + if (ret != 0) { + dev_err(xp, "can't register nofault code, error=%d\n", ret); + return xpSalError; + } + /* + * Setup the nofault PIO read target. (There is no special reason why + * SH_IPI_ACCESS was selected.) + */ + if (is_shub1()) + xp_nofault_PIOR_target = SH1_IPI_ACCESS; + else if (is_shub2()) + xp_nofault_PIOR_target = SH2_IPI_ACCESS0; + + return xpSuccess; +} + +static void +xp_unregister_nofault_code_sn2(void) +{ + u64 func_addr = *(u64 *)xp_nofault_PIOR; + u64 err_func_addr = *(u64 *)xp_error_PIOR; + + /* unregister the PIO read nofault code region */ + (void)sn_register_nofault_code(func_addr, err_func_addr, + err_func_addr, 1, 0); +} + +/* + * Convert a virtual memory address to a physical memory address. + */ +static unsigned long +xp_pa_sn2(void *addr) +{ + return __pa(addr); +} + +/* + * Wrapper for bte_copy(). + * + * dst_pa - physical address of the destination of the transfer. + * src_pa - physical address of the source of the transfer. + * len - number of bytes to transfer from source to destination. + * + * Note: xp_remote_memcpy_sn2() should never be called while holding a spinlock. + */ +static enum xp_retval +xp_remote_memcpy_sn2(unsigned long dst_pa, const unsigned long src_pa, + size_t len) +{ + bte_result_t ret; + + ret = bte_copy(src_pa, dst_pa, len, (BTE_NOTIFY | BTE_WACQUIRE), NULL); + if (ret == BTE_SUCCESS) + return xpSuccess; + + if (is_shub2()) { + dev_err(xp, "bte_copy() on shub2 failed, error=0x%x dst_pa=" + "0x%016lx src_pa=0x%016lx len=%ld\\n", ret, dst_pa, + src_pa, len); + } else { + dev_err(xp, "bte_copy() failed, error=%d dst_pa=0x%016lx " + "src_pa=0x%016lx len=%ld\\n", ret, dst_pa, src_pa, len); + } + + return xpBteCopyError; +} + +static int +xp_cpu_to_nasid_sn2(int cpuid) +{ + return cpuid_to_nasid(cpuid); +} + +enum xp_retval +xp_init_sn2(void) +{ + BUG_ON(!is_shub()); + + xp_max_npartitions = XP_MAX_NPARTITIONS_SN2; + xp_partition_id = sn_partition_id; + xp_region_size = sn_region_size; + + xp_pa = xp_pa_sn2; + xp_remote_memcpy = xp_remote_memcpy_sn2; + xp_cpu_to_nasid = xp_cpu_to_nasid_sn2; + + return xp_register_nofault_code_sn2(); +} + +void +xp_exit_sn2(void) +{ + BUG_ON(!is_shub()); + + xp_unregister_nofault_code_sn2(); +} + diff --git a/drivers/misc/sgi-xp/xp_uv.c b/drivers/misc/sgi-xp/xp_uv.c new file mode 100644 index 00000000000..d9f7ce2510b --- /dev/null +++ b/drivers/misc/sgi-xp/xp_uv.c @@ -0,0 +1,72 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +/* + * Cross Partition (XP) uv-based functions. + * + * Architecture specific implementation of common functions. + * + */ + +#include <linux/device.h> +#include <asm/uv/uv_hub.h> +#include "../sgi-gru/grukservices.h" +#include "xp.h" + +/* + * Convert a virtual memory address to a physical memory address. + */ +static unsigned long +xp_pa_uv(void *addr) +{ + return uv_gpa(addr); +} + +static enum xp_retval +xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa, + size_t len) +{ + int ret; + + ret = gru_copy_gpa(dst_gpa, src_gpa, len); + if (ret == 0) + return xpSuccess; + + dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx " + "len=%ld\n", dst_gpa, src_gpa, len); + return xpGruCopyError; +} + +static int +xp_cpu_to_nasid_uv(int cpuid) +{ + /* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */ + return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid)); +} + +enum xp_retval +xp_init_uv(void) +{ + BUG_ON(!is_uv()); + + xp_max_npartitions = XP_MAX_NPARTITIONS_UV; + xp_partition_id = 0; /* !!! not correct value */ + xp_region_size = 0; /* !!! not correct value */ + + xp_pa = xp_pa_uv; + xp_remote_memcpy = xp_remote_memcpy_uv; + xp_cpu_to_nasid = xp_cpu_to_nasid_uv; + + return xpSuccess; +} + +void +xp_exit_uv(void) +{ + BUG_ON(!is_uv()); +} diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h index 11ac267ed68..619208d6186 100644 --- a/drivers/misc/sgi-xp/xpc.h +++ b/drivers/misc/sgi-xp/xpc.h @@ -13,18 +13,10 @@ #ifndef _DRIVERS_MISC_SGIXP_XPC_H #define _DRIVERS_MISC_SGIXP_XPC_H -#include <linux/interrupt.h> -#include <linux/sysctl.h> -#include <linux/device.h> -#include <linux/mutex.h> +#include <linux/wait.h> #include <linux/completion.h> -#include <asm/pgtable.h> -#include <asm/processor.h> -#include <asm/sn/bte.h> -#include <asm/sn/clksupport.h> -#include <asm/sn/addrs.h> -#include <asm/sn/mspec.h> -#include <asm/sn/shub_mmr.h> +#include <linux/timer.h> +#include <linux/sched.h> #include "xp.h" /* @@ -36,23 +28,7 @@ #define XPC_VERSION_MAJOR(_v) ((_v) >> 4) #define XPC_VERSION_MINOR(_v) ((_v) & 0xf) -/* - * The next macros define word or bit representations for given - * C-brick nasid in either the SAL provided bit array representing - * nasids in the partition/machine or the AMO_t array used for - * inter-partition initiation communications. - * - * For SN2 machines, C-Bricks are alway even numbered NASIDs. As - * such, some space will be saved by insisting that nasid information - * passed from SAL always be packed for C-Bricks and the - * cross-partition interrupts use the same packing scheme. - */ -#define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2) -#define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1)) -#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \ - (1UL << XPC_NASID_B_INDEX(_n))) -#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2) - +/* define frequency of the heartbeat and frequency how often it's checked */ #define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */ #define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */ @@ -72,11 +48,11 @@ * * reserved page header * - * The first cacheline of the reserved page contains the header - * (struct xpc_rsvd_page). Before SAL initialization has completed, + * The first two 64-byte cachelines of the reserved page contain the + * header (struct xpc_rsvd_page). Before SAL initialization has completed, * SAL has set up the following fields of the reserved page header: - * SAL_signature, SAL_version, partid, and nasids_size. The other - * fields are set up by XPC. (xpc_rsvd_page points to the local + * SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The + * other fields are set up by XPC. (xpc_rsvd_page points to the local * partition's reserved page.) * * part_nasids mask @@ -87,14 +63,16 @@ * the actual nasids in the entire machine (mach_nasids). We're only * interested in the even numbered nasids (which contain the processors * and/or memory), so we only need half as many bits to represent the - * nasids. The part_nasids mask is located starting at the first cacheline - * following the reserved page header. The mach_nasids mask follows right - * after the part_nasids mask. The size in bytes of each mask is reflected - * by the reserved page header field 'nasids_size'. (Local partition's - * mask pointers are xpc_part_nasids and xpc_mach_nasids.) + * nasids. When mapping nasid to bit in a mask (or bit to nasid) be sure + * to either divide or multiply by 2. The part_nasids mask is located + * starting at the first cacheline following the reserved page header. The + * mach_nasids mask follows right after the part_nasids mask. The size in + * bytes of each mask is reflected by the reserved page header field + * 'SAL_nasids_size'. (Local partition's mask pointers are xpc_part_nasids + * and xpc_mach_nasids.) * - * vars - * vars part + * vars (ia64-sn2 only) + * vars part (ia64-sn2 only) * * Immediately following the mach_nasids mask are the XPC variables * required by other partitions. First are those that are generic to all @@ -102,43 +80,26 @@ * which are partition specific (vars part). These are setup by XPC. * (Local partition's vars pointers are xpc_vars and xpc_vars_part.) * - * Note: Until vars_pa is set, the partition XPC code has not been initialized. + * Note: Until 'ts_jiffies' is set non-zero, the partition XPC code has not been + * initialized. */ struct xpc_rsvd_page { u64 SAL_signature; /* SAL: unique signature */ u64 SAL_version; /* SAL: version */ - u8 partid; /* SAL: partition ID */ + short SAL_partid; /* SAL: partition ID */ + short max_npartitions; /* value of XPC_MAX_PARTITIONS */ u8 version; - u8 pad1[6]; /* align to next u64 in cacheline */ - u64 vars_pa; /* physical address of struct xpc_vars */ - struct timespec stamp; /* time when reserved page was setup by XPC */ - u64 pad2[9]; /* align to last u64 in cacheline */ - u64 nasids_size; /* SAL: size of each nasid mask in bytes */ + u8 pad1[3]; /* align to next u64 in 1st 64-byte cacheline */ + union { + unsigned long vars_pa; /* phys address of struct xpc_vars */ + unsigned long activate_mq_gpa; /* gru phy addr of activate_mq */ + } sn; + unsigned long ts_jiffies; /* timestamp when rsvd pg was setup by XPC */ + u64 pad2[10]; /* align to last u64 in 2nd 64-byte cacheline */ + u64 SAL_nasids_size; /* SAL: size of each nasid mask in bytes */ }; -#define XPC_RP_VERSION _XPC_VERSION(1, 1) /* version 1.1 of the reserved page */ - -#define XPC_SUPPORTS_RP_STAMP(_version) \ - (_version >= _XPC_VERSION(1, 1)) - -/* - * compare stamps - the return value is: - * - * < 0, if stamp1 < stamp2 - * = 0, if stamp1 == stamp2 - * > 0, if stamp1 > stamp2 - */ -static inline int -xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) -{ - int ret; - - ret = stamp1->tv_sec - stamp2->tv_sec; - if (ret == 0) - ret = stamp1->tv_nsec - stamp2->tv_nsec; - - return ret; -} +#define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */ /* * Define the structures by which XPC variables can be exported to other @@ -154,85 +115,40 @@ xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) * reflected by incrementing either the major or minor version numbers * of struct xpc_vars. */ -struct xpc_vars { +struct xpc_vars_sn2 { u8 version; u64 heartbeat; - u64 heartbeating_to_mask; + DECLARE_BITMAP(heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2); u64 heartbeat_offline; /* if 0, heartbeat should be changing */ - int act_nasid; - int act_phys_cpuid; - u64 vars_part_pa; - u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */ - AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */ + int activate_IRQ_nasid; + int activate_IRQ_phys_cpuid; + unsigned long vars_part_pa; + unsigned long amos_page_pa;/* paddr of page of amos from MSPEC driver */ + struct amo *amos_page; /* vaddr of page of amos from MSPEC driver */ }; #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */ -#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \ - (_version >= _XPC_VERSION(3, 1)) - -static inline int -xpc_hb_allowed(short partid, struct xpc_vars *vars) -{ - return ((vars->heartbeating_to_mask & (1UL << partid)) != 0); -} - -static inline void -xpc_allow_hb(short partid, struct xpc_vars *vars) -{ - u64 old_mask, new_mask; - - do { - old_mask = vars->heartbeating_to_mask; - new_mask = (old_mask | (1UL << partid)); - } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != - old_mask); -} - -static inline void -xpc_disallow_hb(short partid, struct xpc_vars *vars) -{ - u64 old_mask, new_mask; - - do { - old_mask = vars->heartbeating_to_mask; - new_mask = (old_mask & ~(1UL << partid)); - } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != - old_mask); -} - -/* - * The AMOs page consists of a number of AMO variables which are divided into - * four groups, The first two groups are used to identify an IRQ's sender. - * These two groups consist of 64 and 128 AMO variables respectively. The last - * two groups, consisting of just one AMO variable each, are used to identify - * the remote partitions that are currently engaged (from the viewpoint of - * the XPC running on the remote partition). - */ -#define XPC_NOTIFY_IRQ_AMOS 0 -#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS) -#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS) -#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1) - /* * The following structure describes the per partition specific variables. * * An array of these structures, one per partition, will be defined. As a * partition becomes active XPC will copy the array entry corresponding to - * itself from that partition. It is desirable that the size of this - * structure evenly divide into a cacheline, such that none of the entries - * in this array crosses a cacheline boundary. As it is now, each entry - * occupies half a cacheline. + * itself from that partition. It is desirable that the size of this structure + * evenly divides into a 128-byte cacheline, such that none of the entries in + * this array crosses a 128-byte cacheline boundary. As it is now, each entry + * occupies 64-bytes. */ -struct xpc_vars_part { +struct xpc_vars_part_sn2 { u64 magic; - u64 openclose_args_pa; /* physical address of open and close args */ - u64 GPs_pa; /* physical address of Get/Put values */ + unsigned long openclose_args_pa; /* phys addr of open and close args */ + unsigned long GPs_pa; /* physical address of Get/Put values */ + + unsigned long chctl_amo_pa; /* physical address of chctl flags' amo */ - u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */ - int IPI_nasid; /* nasid of where to send IPIs */ - int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */ + int notify_IRQ_nasid; /* nasid of where to send notify IRQs */ + int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */ u8 nchannels; /* #of defined channels supported */ @@ -248,20 +164,95 @@ struct xpc_vars_part { * MAGIC2 indicates that this partition has pulled the remote partititions * per partition variables that pertain to this partition. */ -#define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ -#define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ +#define XPC_VP_MAGIC1_SN2 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ +#define XPC_VP_MAGIC2_SN2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ /* the reserved page sizes and offsets */ #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) -#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars)) +#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars_sn2)) -#define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE)) -#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) -#define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \ - xp_nasid_mask_words)) -#define XPC_RP_VARS_PART(_rp) ((struct xpc_vars_part *) \ - ((u8 *)XPC_RP_VARS(_rp) + XPC_RP_VARS_SIZE)) +#define XPC_RP_PART_NASIDS(_rp) ((unsigned long *)((u8 *)(_rp) + \ + XPC_RP_HEADER_SIZE)) +#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + \ + xpc_nasid_mask_nlongs) +#define XPC_RP_VARS(_rp) ((struct xpc_vars_sn2 *) \ + (XPC_RP_MACH_NASIDS(_rp) + \ + xpc_nasid_mask_nlongs)) + +/* + * The activate_mq is used to send/receive GRU messages that affect XPC's + * heartbeat, partition active state, and channel state. This is UV only. + */ +struct xpc_activate_mq_msghdr_uv { + short partid; /* sender's partid */ + u8 act_state; /* sender's act_state at time msg sent */ + u8 type; /* message's type */ + unsigned long rp_ts_jiffies; /* timestamp of sender's rp setup by XPC */ +}; + +/* activate_mq defined message types */ +#define XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV 0 +#define XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV 1 +#define XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV 2 +#define XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV 3 + +#define XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV 4 +#define XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV 5 + +#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV 6 +#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV 7 +#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV 8 +#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV 9 + +#define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV 10 +#define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV 11 + +struct xpc_activate_mq_msg_uv { + struct xpc_activate_mq_msghdr_uv hdr; +}; + +struct xpc_activate_mq_msg_heartbeat_req_uv { + struct xpc_activate_mq_msghdr_uv hdr; + u64 heartbeat; +}; + +struct xpc_activate_mq_msg_activate_req_uv { + struct xpc_activate_mq_msghdr_uv hdr; + unsigned long rp_gpa; + unsigned long activate_mq_gpa; +}; + +struct xpc_activate_mq_msg_deactivate_req_uv { + struct xpc_activate_mq_msghdr_uv hdr; + enum xp_retval reason; +}; + +struct xpc_activate_mq_msg_chctl_closerequest_uv { + struct xpc_activate_mq_msghdr_uv hdr; + short ch_number; + enum xp_retval reason; +}; + +struct xpc_activate_mq_msg_chctl_closereply_uv { + struct xpc_activate_mq_msghdr_uv hdr; + short ch_number; +}; + +struct xpc_activate_mq_msg_chctl_openrequest_uv { + struct xpc_activate_mq_msghdr_uv hdr; + short ch_number; + short entry_size; /* size of notify_mq's GRU messages */ + short local_nentries; /* ??? Is this needed? What is? */ +}; + +struct xpc_activate_mq_msg_chctl_openreply_uv { + struct xpc_activate_mq_msghdr_uv hdr; + short ch_number; + short remote_nentries; /* ??? Is this needed? What is? */ + short local_nentries; /* ??? Is this needed? What is? */ + unsigned long local_notify_mq_gpa; +}; /* * Functions registered by add_timer() or called by kernel_thread() only @@ -270,22 +261,22 @@ struct xpc_vars_part { * the passed argument. */ #define XPC_PACK_ARGS(_arg1, _arg2) \ - ((((u64) _arg1) & 0xffffffff) | \ - ((((u64) _arg2) & 0xffffffff) << 32)) + ((((u64)_arg1) & 0xffffffff) | \ + ((((u64)_arg2) & 0xffffffff) << 32)) -#define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff) -#define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff) +#define XPC_UNPACK_ARG1(_args) (((u64)_args) & 0xffffffff) +#define XPC_UNPACK_ARG2(_args) ((((u64)_args) >> 32) & 0xffffffff) /* * Define a Get/Put value pair (pointers) used with a message queue. */ -struct xpc_gp { +struct xpc_gp_sn2 { s64 get; /* Get value */ s64 put; /* Put value */ }; #define XPC_GP_SIZE \ - L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS) + L1_CACHE_ALIGN(sizeof(struct xpc_gp_sn2) * XPC_MAX_NCHANNELS) /* * Define a structure that contains arguments associated with opening and @@ -293,31 +284,89 @@ struct xpc_gp { */ struct xpc_openclose_args { u16 reason; /* reason why channel is closing */ - u16 msg_size; /* sizeof each message entry */ + u16 entry_size; /* sizeof each message entry */ u16 remote_nentries; /* #of message entries in remote msg queue */ u16 local_nentries; /* #of message entries in local msg queue */ - u64 local_msgqueue_pa; /* physical address of local message queue */ + unsigned long local_msgqueue_pa; /* phys addr of local message queue */ }; #define XPC_OPENCLOSE_ARGS_SIZE \ - L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS) + L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \ + XPC_MAX_NCHANNELS) -/* struct xpc_msg flags */ -#define XPC_M_DONE 0x01 /* msg has been received/consumed */ -#define XPC_M_READY 0x02 /* msg is ready to be sent */ -#define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ +/* + * Structures to define a fifo singly-linked list. + */ -#define XPC_MSG_ADDRESS(_payload) \ - ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) +struct xpc_fifo_entry_uv { + struct xpc_fifo_entry_uv *next; +}; + +struct xpc_fifo_head_uv { + struct xpc_fifo_entry_uv *first; + struct xpc_fifo_entry_uv *last; + spinlock_t lock; + int n_entries; +}; /* - * Defines notify entry. + * Define a sn2 styled message. + * + * A user-defined message resides in the payload area. The max size of the + * payload is defined by the user via xpc_connect(). + * + * The size of a message entry (within a message queue) must be a 128-byte + * cacheline sized multiple in order to facilitate the BTE transfer of messages + * from one message queue to another. + */ +struct xpc_msg_sn2 { + u8 flags; /* FOR XPC INTERNAL USE ONLY */ + u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */ + s64 number; /* FOR XPC INTERNAL USE ONLY */ + + u64 payload; /* user defined portion of message */ +}; + +/* struct xpc_msg_sn2 flags */ + +#define XPC_M_SN2_DONE 0x01 /* msg has been received/consumed */ +#define XPC_M_SN2_READY 0x02 /* msg is ready to be sent */ +#define XPC_M_SN2_INTERRUPT 0x04 /* send interrupt when msg consumed */ + +/* + * The format of a uv XPC notify_mq GRU message is as follows: + * + * A user-defined message resides in the payload area. The max size of the + * payload is defined by the user via xpc_connect(). + * + * The size of a message (payload and header) sent via the GRU must be either 1 + * or 2 GRU_CACHE_LINE_BYTES in length. + */ + +struct xpc_notify_mq_msghdr_uv { + union { + unsigned int gru_msg_hdr; /* FOR GRU INTERNAL USE ONLY */ + struct xpc_fifo_entry_uv next; /* FOR XPC INTERNAL USE ONLY */ + } u; + short partid; /* FOR XPC INTERNAL USE ONLY */ + u8 ch_number; /* FOR XPC INTERNAL USE ONLY */ + u8 size; /* FOR XPC INTERNAL USE ONLY */ + unsigned int msg_slot_number; /* FOR XPC INTERNAL USE ONLY */ +}; + +struct xpc_notify_mq_msg_uv { + struct xpc_notify_mq_msghdr_uv hdr; + unsigned long payload; +}; + +/* + * Define sn2's notify entry. * * This is used to notify a message's sender that their message was received * and consumed by the intended recipient. */ -struct xpc_notify { +struct xpc_notify_sn2 { u8 type; /* type of notification */ /* the following two fields are only used if type == XPC_N_CALL */ @@ -325,9 +374,20 @@ struct xpc_notify { void *key; /* pointer to user's key */ }; -/* struct xpc_notify type of notification */ +/* struct xpc_notify_sn2 type of notification */ + +#define XPC_N_CALL 0x01 /* notify function provided by user */ -#define XPC_N_CALL 0x01 /* notify function provided by user */ +/* + * Define uv's version of the notify entry. It additionally is used to allocate + * a msg slot on the remote partition into which is copied a sent message. + */ +struct xpc_send_msg_slot_uv { + struct xpc_fifo_entry_uv next; + unsigned int msg_slot_number; + xpc_notify_func func; /* user's notify function */ + void *key; /* pointer to user's key */ +}; /* * Define the structure that manages all the stuff required by a channel. In @@ -339,8 +399,12 @@ struct xpc_notify { * There is an array of these structures for each remote partition. It is * allocated at the time a partition becomes active. The array contains one * of these structures for each potential channel connection to that partition. + */ + +/* + * The following is sn2 only. * - * Each of these structures manages two message queues (circular buffers). + * Each channel structure manages two message queues (circular buffers). * They are allocated at the time a channel connection is made. One of * these message queues (local_msgqueue) holds the locally created messages * that are destined for the remote partition. The other of these message @@ -407,58 +471,72 @@ struct xpc_notify { * new messages, by the clearing of the message flags of the acknowledged * messages. */ + +struct xpc_channel_sn2 { + struct xpc_openclose_args *local_openclose_args; /* args passed on */ + /* opening or closing of channel */ + + void *local_msgqueue_base; /* base address of kmalloc'd space */ + struct xpc_msg_sn2 *local_msgqueue; /* local message queue */ + void *remote_msgqueue_base; /* base address of kmalloc'd space */ + struct xpc_msg_sn2 *remote_msgqueue; /* cached copy of remote */ + /* partition's local message queue */ + unsigned long remote_msgqueue_pa; /* phys addr of remote partition's */ + /* local message queue */ + + struct xpc_notify_sn2 *notify_queue;/* notify queue for messages sent */ + + /* various flavors of local and remote Get/Put values */ + + struct xpc_gp_sn2 *local_GP; /* local Get/Put values */ + struct xpc_gp_sn2 remote_GP; /* remote Get/Put values */ + struct xpc_gp_sn2 w_local_GP; /* working local Get/Put values */ + struct xpc_gp_sn2 w_remote_GP; /* working remote Get/Put values */ + s64 next_msg_to_pull; /* Put value of next msg to pull */ + + struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ +}; + +struct xpc_channel_uv { + unsigned long remote_notify_mq_gpa; /* gru phys address of remote */ + /* partition's notify mq */ + + struct xpc_send_msg_slot_uv *send_msg_slots; + struct xpc_notify_mq_msg_uv *recv_msg_slots; + + struct xpc_fifo_head_uv msg_slot_free_list; + struct xpc_fifo_head_uv recv_msg_list; /* deliverable payloads */ +}; + struct xpc_channel { short partid; /* ID of remote partition connected */ spinlock_t lock; /* lock for updating this structure */ - u32 flags; /* general flags */ + unsigned int flags; /* general flags */ enum xp_retval reason; /* reason why channel is disconnect'g */ int reason_line; /* line# disconnect initiated from */ u16 number; /* channel # */ - u16 msg_size; /* sizeof each msg entry */ + u16 entry_size; /* sizeof each msg entry */ u16 local_nentries; /* #of msg entries in local msg queue */ u16 remote_nentries; /* #of msg entries in remote msg queue */ - void *local_msgqueue_base; /* base address of kmalloc'd space */ - struct xpc_msg *local_msgqueue; /* local message queue */ - void *remote_msgqueue_base; /* base address of kmalloc'd space */ - struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */ - /* local message queue */ - u64 remote_msgqueue_pa; /* phys addr of remote partition's */ - /* local message queue */ - atomic_t references; /* #of external references to queues */ atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ - u8 delayed_IPI_flags; /* IPI flags received, but delayed */ + u8 delayed_chctl_flags; /* chctl flags received, but delayed */ /* action until channel disconnected */ - /* queue of msg senders who want to be notified when msg received */ - atomic_t n_to_notify; /* #of msg senders to notify */ - struct xpc_notify *notify_queue; /* notify queue for messages sent */ xpc_channel_func func; /* user's channel function */ void *key; /* pointer to user's key */ - struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ struct completion wdisconnect_wait; /* wait for channel disconnect */ - struct xpc_openclose_args *local_openclose_args; /* args passed on */ - /* opening or closing of channel */ - - /* various flavors of local and remote Get/Put values */ - - struct xpc_gp *local_GP; /* local Get/Put values */ - struct xpc_gp remote_GP; /* remote Get/Put values */ - struct xpc_gp w_local_GP; /* working local Get/Put values */ - struct xpc_gp w_remote_GP; /* working remote Get/Put values */ - s64 next_msg_to_pull; /* Put value of next msg to pull */ - /* kthread management related fields */ atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ @@ -469,6 +547,11 @@ struct xpc_channel { wait_queue_head_t idle_wq; /* idle kthread wait queue */ + union { + struct xpc_channel_sn2 sn2; + struct xpc_channel_uv uv; + } sn; + } ____cacheline_aligned; /* struct xpc_channel flags */ @@ -501,33 +584,128 @@ struct xpc_channel { #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ /* - * Manages channels on a partition basis. There is one of these structures + * The channel control flags (chctl) union consists of a 64-bit variable which + * is divided up into eight bytes, ordered from right to left. Byte zero + * pertains to channel 0, byte one to channel 1, and so on. Each channel's byte + * can have one or more of the chctl flags set in it. + */ + +union xpc_channel_ctl_flags { + u64 all_flags; + u8 flags[XPC_MAX_NCHANNELS]; +}; + +/* chctl flags */ +#define XPC_CHCTL_CLOSEREQUEST 0x01 +#define XPC_CHCTL_CLOSEREPLY 0x02 +#define XPC_CHCTL_OPENREQUEST 0x04 +#define XPC_CHCTL_OPENREPLY 0x08 +#define XPC_CHCTL_MSGREQUEST 0x10 + +#define XPC_OPENCLOSE_CHCTL_FLAGS \ + (XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \ + XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY) +#define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST + +static inline int +xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl) +{ + int ch_number; + + for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) { + if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) + return 1; + } + return 0; +} + +static inline int +xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl) +{ + int ch_number; + + for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) { + if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS) + return 1; + } + return 0; +} + +/* + * Manage channels on a partition basis. There is one of these structures * for each partition (a partition will never utilize the structure that * represents itself). */ + +struct xpc_partition_sn2 { + unsigned long remote_amos_page_pa; /* paddr of partition's amos page */ + int activate_IRQ_nasid; /* active partition's act/deact nasid */ + int activate_IRQ_phys_cpuid; /* active part's act/deact phys cpuid */ + + unsigned long remote_vars_pa; /* phys addr of partition's vars */ + unsigned long remote_vars_part_pa; /* paddr of partition's vars part */ + u8 remote_vars_version; /* version# of partition's vars */ + + void *local_GPs_base; /* base address of kmalloc'd space */ + struct xpc_gp_sn2 *local_GPs; /* local Get/Put values */ + void *remote_GPs_base; /* base address of kmalloc'd space */ + struct xpc_gp_sn2 *remote_GPs; /* copy of remote partition's local */ + /* Get/Put values */ + unsigned long remote_GPs_pa; /* phys addr of remote partition's local */ + /* Get/Put values */ + + void *local_openclose_args_base; /* base address of kmalloc'd space */ + struct xpc_openclose_args *local_openclose_args; /* local's args */ + unsigned long remote_openclose_args_pa; /* phys addr of remote's args */ + + int notify_IRQ_nasid; /* nasid of where to send notify IRQs */ + int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */ + char notify_IRQ_owner[8]; /* notify IRQ's owner's name */ + + struct amo *remote_chctl_amo_va; /* addr of remote chctl flags' amo */ + struct amo *local_chctl_amo_va; /* address of chctl flags' amo */ + + struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */ +}; + +struct xpc_partition_uv { + unsigned long remote_activate_mq_gpa; /* gru phys address of remote */ + /* partition's activate mq */ + spinlock_t flags_lock; /* protect updating of flags */ + unsigned int flags; /* general flags */ + u8 remote_act_state; /* remote partition's act_state */ + u8 act_state_req; /* act_state request from remote partition */ + enum xp_retval reason; /* reason for deactivate act_state request */ + u64 heartbeat; /* incremented by remote partition */ +}; + +/* struct xpc_partition_uv flags */ + +#define XPC_P_HEARTBEAT_OFFLINE_UV 0x00000001 +#define XPC_P_ENGAGED_UV 0x00000002 + +/* struct xpc_partition_uv act_state change requests */ + +#define XPC_P_ASR_ACTIVATE_UV 0x01 +#define XPC_P_ASR_REACTIVATE_UV 0x02 +#define XPC_P_ASR_DEACTIVATE_UV 0x03 + struct xpc_partition { /* XPC HB infrastructure */ u8 remote_rp_version; /* version# of partition's rsvd pg */ - struct timespec remote_rp_stamp; /* time when rsvd pg was initialized */ - u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ - u64 remote_vars_pa; /* phys addr of partition's vars */ - u64 remote_vars_part_pa; /* phys addr of partition's vars part */ + unsigned long remote_rp_ts_jiffies; /* timestamp when rsvd pg setup */ + unsigned long remote_rp_pa; /* phys addr of partition's rsvd pg */ u64 last_heartbeat; /* HB at last read */ - u64 remote_amos_page_pa; /* phys addr of partition's amos page */ - int remote_act_nasid; /* active part's act/deact nasid */ - int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */ - u32 act_IRQ_rcvd; /* IRQs since activation */ + u32 activate_IRQ_rcvd; /* IRQs since activation */ spinlock_t act_lock; /* protect updating of act_state */ u8 act_state; /* from XPC HB viewpoint */ - u8 remote_vars_version; /* version# of partition's vars */ enum xp_retval reason; /* reason partition is deactivating */ int reason_line; /* line# deactivation initiated from */ - int reactivate_nasid; /* nasid in partition to reactivate */ - unsigned long disengage_request_timeout; /* timeout in jiffies */ - struct timer_list disengage_request_timer; + unsigned long disengage_timeout; /* timeout in jiffies */ + struct timer_list disengage_timer; /* XPC infrastructure referencing and teardown control */ @@ -535,85 +713,63 @@ struct xpc_partition { wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ atomic_t references; /* #of references to infrastructure */ - /* - * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN - * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION - * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE - * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.) - */ - u8 nchannels; /* #of defined channels supported */ atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ atomic_t nchannels_engaged; /* #of channels engaged with remote part */ struct xpc_channel *channels; /* array of channel structures */ - void *local_GPs_base; /* base address of kmalloc'd space */ - struct xpc_gp *local_GPs; /* local Get/Put values */ - void *remote_GPs_base; /* base address of kmalloc'd space */ - struct xpc_gp *remote_GPs; /* copy of remote partition's local */ - /* Get/Put values */ - u64 remote_GPs_pa; /* phys address of remote partition's local */ - /* Get/Put values */ + /* fields used for managing channel avialability and activity */ - /* fields used to pass args when opening or closing a channel */ + union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */ + spinlock_t chctl_lock; /* chctl flags lock */ - void *local_openclose_args_base; /* base address of kmalloc'd space */ - struct xpc_openclose_args *local_openclose_args; /* local's args */ void *remote_openclose_args_base; /* base address of kmalloc'd space */ struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ /* args */ - u64 remote_openclose_args_pa; /* phys addr of remote's args */ - - /* IPI sending, receiving and handling related fields */ - - int remote_IPI_nasid; /* nasid of where to send IPIs */ - int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */ - AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */ - - AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */ - u64 local_IPI_amo; /* IPI amo flags yet to be handled */ - char IPI_owner[8]; /* IPI owner's name */ - struct timer_list dropped_IPI_timer; /* dropped IPI timer */ - - spinlock_t IPI_lock; /* IPI handler lock */ /* channel manager related fields */ atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ + union { + struct xpc_partition_sn2 sn2; + struct xpc_partition_uv uv; + } sn; + } ____cacheline_aligned; /* struct xpc_partition act_state values (for XPC HB) */ -#define XPC_P_INACTIVE 0x00 /* partition is not active */ -#define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ -#define XPC_P_ACTIVATING 0x02 /* activation thread started */ -#define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ -#define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ +#define XPC_P_AS_INACTIVE 0x00 /* partition is not active */ +#define XPC_P_AS_ACTIVATION_REQ 0x01 /* created thread to activate */ +#define XPC_P_AS_ACTIVATING 0x02 /* activation thread started */ +#define XPC_P_AS_ACTIVE 0x03 /* xpc_partition_up() was called */ +#define XPC_P_AS_DEACTIVATING 0x04 /* partition deactivation initiated */ #define XPC_DEACTIVATE_PARTITION(_p, _reason) \ xpc_deactivate_partition(__LINE__, (_p), (_reason)) /* struct xpc_partition setup_state values */ -#define XPC_P_UNSET 0x00 /* infrastructure was never setup */ -#define XPC_P_SETUP 0x01 /* infrastructure is setup */ -#define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ -#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ +#define XPC_P_SS_UNSET 0x00 /* infrastructure was never setup */ +#define XPC_P_SS_SETUP 0x01 /* infrastructure is setup */ +#define XPC_P_SS_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ +#define XPC_P_SS_TORNDOWN 0x03 /* infrastructure is torndown */ /* - * struct xpc_partition IPI_timer #of seconds to wait before checking for - * dropped IPIs. These occur whenever an IPI amo write doesn't complete until - * after the IPI was received. + * struct xpc_partition_sn2's dropped notify IRQ timer is set to wait the + * following interval #of seconds before checking for dropped notify IRQs. + * These can occur whenever an IRQ's associated amo write doesn't complete + * until after the IRQ was received. */ -#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ) +#define XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL (0.25 * HZ) /* number of seconds to wait for other partitions to disengage */ -#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 +#define XPC_DISENGAGE_DEFAULT_TIMELIMIT 90 -/* interval in seconds to print 'waiting disengagement' messages */ -#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10 +/* interval in seconds to print 'waiting deactivation' messages */ +#define XPC_DEACTIVATE_PRINTMSG_INTERVAL 10 #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0])) @@ -623,33 +779,92 @@ extern struct xpc_registration xpc_registrations[]; /* found in xpc_main.c */ extern struct device *xpc_part; extern struct device *xpc_chan; -extern int xpc_disengage_request_timelimit; -extern int xpc_disengage_request_timedout; -extern irqreturn_t xpc_notify_IRQ_handler(int, void *); -extern void xpc_dropped_IPI_check(struct xpc_partition *); +extern int xpc_disengage_timelimit; +extern int xpc_disengage_timedout; +extern int xpc_activate_IRQ_rcvd; +extern spinlock_t xpc_activate_IRQ_rcvd_lock; +extern wait_queue_head_t xpc_activate_IRQ_wq; +extern void *xpc_heartbeating_to_mask; +extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **); extern void xpc_activate_partition(struct xpc_partition *); extern void xpc_activate_kthreads(struct xpc_channel *, int); extern void xpc_create_kthreads(struct xpc_channel *, int, int); extern void xpc_disconnect_wait(int); +extern int (*xpc_setup_partitions_sn) (void); +extern enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *, u64 *, + unsigned long *, + size_t *); +extern int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *); +extern void (*xpc_heartbeat_init) (void); +extern void (*xpc_heartbeat_exit) (void); +extern void (*xpc_increment_heartbeat) (void); +extern void (*xpc_offline_heartbeat) (void); +extern void (*xpc_online_heartbeat) (void); +extern enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *); +extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *); +extern u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *); +extern enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *); +extern void (*xpc_teardown_msg_structures) (struct xpc_channel *); +extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *); +extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int); +extern int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *); +extern void *(*xpc_get_deliverable_payload) (struct xpc_channel *); +extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *, + unsigned long, int); +extern void (*xpc_request_partition_reactivation) (struct xpc_partition *); +extern void (*xpc_request_partition_deactivation) (struct xpc_partition *); +extern void (*xpc_cancel_partition_deactivation_request) ( + struct xpc_partition *); +extern void (*xpc_process_activate_IRQ_rcvd) (void); +extern enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *); +extern void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *); + +extern void (*xpc_indicate_partition_engaged) (struct xpc_partition *); +extern int (*xpc_partition_engaged) (short); +extern int (*xpc_any_partition_engaged) (void); +extern void (*xpc_indicate_partition_disengaged) (struct xpc_partition *); +extern void (*xpc_assume_partition_disengaged) (short); + +extern void (*xpc_send_chctl_closerequest) (struct xpc_channel *, + unsigned long *); +extern void (*xpc_send_chctl_closereply) (struct xpc_channel *, + unsigned long *); +extern void (*xpc_send_chctl_openrequest) (struct xpc_channel *, + unsigned long *); +extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *); + +extern void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *, + unsigned long); + +extern enum xp_retval (*xpc_send_payload) (struct xpc_channel *, u32, void *, + u16, u8, xpc_notify_func, void *); +extern void (*xpc_received_payload) (struct xpc_channel *, void *); + +/* found in xpc_sn2.c */ +extern int xpc_init_sn2(void); +extern void xpc_exit_sn2(void); + +/* found in xpc_uv.c */ +extern int xpc_init_uv(void); +extern void xpc_exit_uv(void); /* found in xpc_partition.c */ extern int xpc_exiting; -extern struct xpc_vars *xpc_vars; +extern int xpc_nasid_mask_nlongs; extern struct xpc_rsvd_page *xpc_rsvd_page; -extern struct xpc_vars_part *xpc_vars_part; -extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1]; -extern char *xpc_remote_copy_buffer; -extern void *xpc_remote_copy_buffer_base; +extern unsigned long *xpc_mach_nasids; +extern struct xpc_partition *xpc_partitions; extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); -extern struct xpc_rsvd_page *xpc_rsvd_page_init(void); -extern void xpc_allow_IPI_ops(void); -extern void xpc_restrict_IPI_ops(void); -extern int xpc_identify_act_IRQ_sender(void); +extern int xpc_setup_rsvd_page(void); +extern void xpc_teardown_rsvd_page(void); +extern int xpc_identify_activate_IRQ_sender(void); extern int xpc_partition_disengaged(struct xpc_partition *); extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *); extern void xpc_mark_partition_inactive(struct xpc_partition *); extern void xpc_discovery(void); -extern void xpc_check_remote_hb(void); +extern enum xp_retval xpc_get_remote_rp(int, unsigned long *, + struct xpc_rsvd_page *, + unsigned long *); extern void xpc_deactivate_partition(const int, struct xpc_partition *, enum xp_retval); extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); @@ -657,21 +872,52 @@ extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); /* found in xpc_channel.c */ extern void xpc_initiate_connect(int); extern void xpc_initiate_disconnect(int); -extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **); -extern enum xp_retval xpc_initiate_send(short, int, void *); -extern enum xp_retval xpc_initiate_send_notify(short, int, void *, +extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *); +extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16); +extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16, xpc_notify_func, void *); extern void xpc_initiate_received(short, int, void *); -extern enum xp_retval xpc_setup_infrastructure(struct xpc_partition *); -extern enum xp_retval xpc_pull_remote_vars_part(struct xpc_partition *); -extern void xpc_process_channel_activity(struct xpc_partition *); +extern void xpc_process_sent_chctl_flags(struct xpc_partition *); extern void xpc_connected_callout(struct xpc_channel *); -extern void xpc_deliver_msg(struct xpc_channel *); +extern void xpc_deliver_payload(struct xpc_channel *); extern void xpc_disconnect_channel(const int, struct xpc_channel *, enum xp_retval, unsigned long *); extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); -extern void xpc_teardown_infrastructure(struct xpc_partition *); + +static inline int +xpc_hb_allowed(short partid, void *heartbeating_to_mask) +{ + return test_bit(partid, heartbeating_to_mask); +} + +static inline int +xpc_any_hbs_allowed(void) +{ + DBUG_ON(xpc_heartbeating_to_mask == NULL); + return !bitmap_empty(xpc_heartbeating_to_mask, xp_max_npartitions); +} + +static inline void +xpc_allow_hb(short partid) +{ + DBUG_ON(xpc_heartbeating_to_mask == NULL); + set_bit(partid, xpc_heartbeating_to_mask); +} + +static inline void +xpc_disallow_hb(short partid) +{ + DBUG_ON(xpc_heartbeating_to_mask == NULL); + clear_bit(partid, xpc_heartbeating_to_mask); +} + +static inline void +xpc_disallow_all_hbs(void) +{ + DBUG_ON(xpc_heartbeating_to_mask == NULL); + bitmap_zero(xpc_heartbeating_to_mask, xp_max_npartitions); +} static inline void xpc_wakeup_channel_mgr(struct xpc_partition *part) @@ -713,7 +959,7 @@ xpc_part_deref(struct xpc_partition *part) s32 refs = atomic_dec_return(&part->references); DBUG_ON(refs < 0); - if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) + if (refs == 0 && part->setup_state == XPC_P_SS_WTEARDOWN) wake_up(&part->teardown_wq); } @@ -723,7 +969,7 @@ xpc_part_ref(struct xpc_partition *part) int setup; atomic_inc(&part->references); - setup = (part->setup_state == XPC_P_SETUP); + setup = (part->setup_state == XPC_P_SS_SETUP); if (!setup) xpc_part_deref(part); @@ -741,416 +987,4 @@ xpc_part_ref(struct xpc_partition *part) (_p)->reason_line = _line; \ } -/* - * This next set of inlines are used to keep track of when a partition is - * potentially engaged in accessing memory belonging to another partition. - */ - -static inline void -xpc_mark_partition_engaged(struct xpc_partition *part) -{ - unsigned long irq_flags; - AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + - (XPC_ENGAGED_PARTITIONS_AMO * - sizeof(AMO_t))); - - local_irq_save(irq_flags); - - /* set bit corresponding to our partid in remote partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, - (1UL << sn_partition_id)); - /* - * We must always use the nofault function regardless of whether we - * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we - * didn't, we'd never know that the other partition is down and would - * keep sending IPIs and AMOs to it until the heartbeat times out. - */ - (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> - variable), - xp_nofault_PIOR_target)); - - local_irq_restore(irq_flags); -} - -static inline void -xpc_mark_partition_disengaged(struct xpc_partition *part) -{ - unsigned long irq_flags; - AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + - (XPC_ENGAGED_PARTITIONS_AMO * - sizeof(AMO_t))); - - local_irq_save(irq_flags); - - /* clear bit corresponding to our partid in remote partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, - ~(1UL << sn_partition_id)); - /* - * We must always use the nofault function regardless of whether we - * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we - * didn't, we'd never know that the other partition is down and would - * keep sending IPIs and AMOs to it until the heartbeat times out. - */ - (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> - variable), - xp_nofault_PIOR_target)); - - local_irq_restore(irq_flags); -} - -static inline void -xpc_request_partition_disengage(struct xpc_partition *part) -{ - unsigned long irq_flags; - AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + - (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); - - local_irq_save(irq_flags); - - /* set bit corresponding to our partid in remote partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, - (1UL << sn_partition_id)); - /* - * We must always use the nofault function regardless of whether we - * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we - * didn't, we'd never know that the other partition is down and would - * keep sending IPIs and AMOs to it until the heartbeat times out. - */ - (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> - variable), - xp_nofault_PIOR_target)); - - local_irq_restore(irq_flags); -} - -static inline void -xpc_cancel_partition_disengage_request(struct xpc_partition *part) -{ - unsigned long irq_flags; - AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + - (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); - - local_irq_save(irq_flags); - - /* clear bit corresponding to our partid in remote partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, - ~(1UL << sn_partition_id)); - /* - * We must always use the nofault function regardless of whether we - * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we - * didn't, we'd never know that the other partition is down and would - * keep sending IPIs and AMOs to it until the heartbeat times out. - */ - (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> - variable), - xp_nofault_PIOR_target)); - - local_irq_restore(irq_flags); -} - -static inline u64 -xpc_partition_engaged(u64 partid_mask) -{ - AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; - - /* return our partition's AMO variable ANDed with partid_mask */ - return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & - partid_mask); -} - -static inline u64 -xpc_partition_disengage_requested(u64 partid_mask) -{ - AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; - - /* return our partition's AMO variable ANDed with partid_mask */ - return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & - partid_mask); -} - -static inline void -xpc_clear_partition_engaged(u64 partid_mask) -{ - AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; - - /* clear bit(s) based on partid_mask in our partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, - ~partid_mask); -} - -static inline void -xpc_clear_partition_disengage_request(u64 partid_mask) -{ - AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; - - /* clear bit(s) based on partid_mask in our partition's AMO */ - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, - ~partid_mask); -} - -/* - * The following set of macros and inlines are used for the sending and - * receiving of IPIs (also known as IRQs). There are two flavors of IPIs, - * one that is associated with partition activity (SGI_XPC_ACTIVATE) and - * the other that is associated with channel activity (SGI_XPC_NOTIFY). - */ - -static inline u64 -xpc_IPI_receive(AMO_t *amo) -{ - return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR); -} - -static inline enum xp_retval -xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector) -{ - int ret = 0; - unsigned long irq_flags; - - local_irq_save(irq_flags); - - FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag); - sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); - - /* - * We must always use the nofault function regardless of whether we - * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we - * didn't, we'd never know that the other partition is down and would - * keep sending IPIs and AMOs to it until the heartbeat times out. - */ - ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), - xp_nofault_PIOR_target)); - - local_irq_restore(irq_flags); - - return ((ret == 0) ? xpSuccess : xpPioReadError); -} - -/* - * IPIs associated with SGI_XPC_ACTIVATE IRQ. - */ - -/* - * Flag the appropriate AMO variable and send an IPI to the specified node. - */ -static inline void -xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid, - int to_phys_cpuid) -{ - int w_index = XPC_NASID_W_INDEX(from_nasid); - int b_index = XPC_NASID_B_INDEX(from_nasid); - AMO_t *amos = (AMO_t *)__va(amos_page_pa + - (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t))); - - (void)xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid, - to_phys_cpuid, SGI_XPC_ACTIVATE); -} - -static inline void -xpc_IPI_send_activate(struct xpc_vars *vars) -{ - xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0), - vars->act_nasid, vars->act_phys_cpuid); -} - -static inline void -xpc_IPI_send_activated(struct xpc_partition *part) -{ - xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), - part->remote_act_nasid, - part->remote_act_phys_cpuid); -} - -static inline void -xpc_IPI_send_reactivate(struct xpc_partition *part) -{ - xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid, - xpc_vars->act_nasid, xpc_vars->act_phys_cpuid); -} - -static inline void -xpc_IPI_send_disengage(struct xpc_partition *part) -{ - xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), - part->remote_act_nasid, - part->remote_act_phys_cpuid); -} - -/* - * IPIs associated with SGI_XPC_NOTIFY IRQ. - */ - -/* - * Send an IPI to the remote partition that is associated with the - * specified channel. - */ -#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \ - xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f) - -static inline void -xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string, - unsigned long *irq_flags) -{ - struct xpc_partition *part = &xpc_partitions[ch->partid]; - enum xp_retval ret; - - if (likely(part->act_state != XPC_P_DEACTIVATING)) { - ret = xpc_IPI_send(part->remote_IPI_amo_va, - (u64)ipi_flag << (ch->number * 8), - part->remote_IPI_nasid, - part->remote_IPI_phys_cpuid, SGI_XPC_NOTIFY); - dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", - ipi_flag_string, ch->partid, ch->number, ret); - if (unlikely(ret != xpSuccess)) { - if (irq_flags != NULL) - spin_unlock_irqrestore(&ch->lock, *irq_flags); - XPC_DEACTIVATE_PARTITION(part, ret); - if (irq_flags != NULL) - spin_lock_irqsave(&ch->lock, *irq_flags); - } - } -} - -/* - * Make it look like the remote partition, which is associated with the - * specified channel, sent us an IPI. This faked IPI will be handled - * by xpc_dropped_IPI_check(). - */ -#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \ - xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f) - -static inline void -xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag, - char *ipi_flag_string) -{ - struct xpc_partition *part = &xpc_partitions[ch->partid]; - - FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable), - FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8))); - dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", - ipi_flag_string, ch->partid, ch->number); -} - -/* - * The sending and receiving of IPIs includes the setting of an AMO variable - * to indicate the reason the IPI was sent. The 64-bit variable is divided - * up into eight bytes, ordered from right to left. Byte zero pertains to - * channel 0, byte one to channel 1, and so on. Each byte is described by - * the following IPI flags. - */ - -#define XPC_IPI_CLOSEREQUEST 0x01 -#define XPC_IPI_CLOSEREPLY 0x02 -#define XPC_IPI_OPENREQUEST 0x04 -#define XPC_IPI_OPENREPLY 0x08 -#define XPC_IPI_MSGREQUEST 0x10 - -/* given an AMO variable and a channel#, get its associated IPI flags */ -#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff)) -#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8)) - -#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL) -#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL) - -static inline void -xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags) -{ - struct xpc_openclose_args *args = ch->local_openclose_args; - - args->reason = ch->reason; - - XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags); -} - -static inline void -xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags) -{ - XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags); -} - -static inline void -xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags) -{ - struct xpc_openclose_args *args = ch->local_openclose_args; - - args->msg_size = ch->msg_size; - args->local_nentries = ch->local_nentries; - - XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags); -} - -static inline void -xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags) -{ - struct xpc_openclose_args *args = ch->local_openclose_args; - - args->remote_nentries = ch->remote_nentries; - args->local_nentries = ch->local_nentries; - args->local_msgqueue_pa = __pa(ch->local_msgqueue); - - XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags); -} - -static inline void -xpc_IPI_send_msgrequest(struct xpc_channel *ch) -{ - XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL); -} - -static inline void -xpc_IPI_send_local_msgrequest(struct xpc_channel *ch) -{ - XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST); -} - -/* - * Memory for XPC's AMO variables is allocated by the MSPEC driver. These - * pages are located in the lowest granule. The lowest granule uses 4k pages - * for cached references and an alternate TLB handler to never provide a - * cacheable mapping for the entire region. This will prevent speculative - * reading of cached copies of our lines from being issued which will cause - * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 - * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an - * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition - * activation and 2 AMO variables for partition deactivation. - */ -static inline AMO_t * -xpc_IPI_init(int index) -{ - AMO_t *amo = xpc_vars->amos_page + index; - - (void)xpc_IPI_receive(amo); /* clear AMO variable */ - return amo; -} - -static inline enum xp_retval -xpc_map_bte_errors(bte_result_t error) -{ - return ((error == BTE_SUCCESS) ? xpSuccess : xpBteCopyError); -} - -/* - * Check to see if there is any channel activity to/from the specified - * partition. - */ -static inline void -xpc_check_for_channel_activity(struct xpc_partition *part) -{ - u64 IPI_amo; - unsigned long irq_flags; - - IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va); - if (IPI_amo == 0) - return; - - spin_lock_irqsave(&part->IPI_lock, irq_flags); - part->local_IPI_amo |= IPI_amo; - spin_unlock_irqrestore(&part->IPI_lock, irq_flags); - - dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n", - XPC_PARTID(part), IPI_amo); - - xpc_wakeup_channel_mgr(part); -} - #endif /* _DRIVERS_MISC_SGIXP_XPC_H */ diff --git a/drivers/misc/sgi-xp/xpc_channel.c b/drivers/misc/sgi-xp/xpc_channel.c index 9c90c2d55c0..9cd2ebe2a3b 100644 --- a/drivers/misc/sgi-xp/xpc_channel.c +++ b/drivers/misc/sgi-xp/xpc_channel.c @@ -14,536 +14,10 @@ * */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/cache.h> -#include <linux/interrupt.h> -#include <linux/mutex.h> -#include <linux/completion.h> -#include <asm/sn/bte.h> -#include <asm/sn/sn_sal.h> +#include <linux/device.h> #include "xpc.h" /* - * Guarantee that the kzalloc'd memory is cacheline aligned. - */ -static void * -xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) -{ - /* see if kzalloc will give us cachline aligned memory by default */ - *base = kzalloc(size, flags); - if (*base == NULL) - return NULL; - - if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) - return *base; - - kfree(*base); - - /* nope, we'll have to do it ourselves */ - *base = kzalloc(size + L1_CACHE_BYTES, flags); - if (*base == NULL) - return NULL; - - return (void *)L1_CACHE_ALIGN((u64)*base); -} - -/* - * Set up the initial values for the XPartition Communication channels. - */ -static void -xpc_initialize_channels(struct xpc_partition *part, short partid) -{ - int ch_number; - struct xpc_channel *ch; - - for (ch_number = 0; ch_number < part->nchannels; ch_number++) { - ch = &part->channels[ch_number]; - - ch->partid = partid; - ch->number = ch_number; - ch->flags = XPC_C_DISCONNECTED; - - ch->local_GP = &part->local_GPs[ch_number]; - ch->local_openclose_args = - &part->local_openclose_args[ch_number]; - - atomic_set(&ch->kthreads_assigned, 0); - atomic_set(&ch->kthreads_idle, 0); - atomic_set(&ch->kthreads_active, 0); - - atomic_set(&ch->references, 0); - atomic_set(&ch->n_to_notify, 0); - - spin_lock_init(&ch->lock); - mutex_init(&ch->msg_to_pull_mutex); - init_completion(&ch->wdisconnect_wait); - - atomic_set(&ch->n_on_msg_allocate_wq, 0); - init_waitqueue_head(&ch->msg_allocate_wq); - init_waitqueue_head(&ch->idle_wq); - } -} - -/* - * Setup the infrastructure necessary to support XPartition Communication - * between the specified remote partition and the local one. - */ -enum xp_retval -xpc_setup_infrastructure(struct xpc_partition *part) -{ - int ret, cpuid; - struct timer_list *timer; - short partid = XPC_PARTID(part); - - /* - * Zero out MOST of the entry for this partition. Only the fields - * starting with `nchannels' will be zeroed. The preceding fields must - * remain `viable' across partition ups and downs, since they may be - * referenced during this memset() operation. - */ - memset(&part->nchannels, 0, sizeof(struct xpc_partition) - - offsetof(struct xpc_partition, nchannels)); - - /* - * Allocate all of the channel structures as a contiguous chunk of - * memory. - */ - part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_NCHANNELS, - GFP_KERNEL); - if (part->channels == NULL) { - dev_err(xpc_chan, "can't get memory for channels\n"); - return xpNoMemory; - } - - part->nchannels = XPC_NCHANNELS; - - /* allocate all the required GET/PUT values */ - - part->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, - GFP_KERNEL, - &part->local_GPs_base); - if (part->local_GPs == NULL) { - kfree(part->channels); - part->channels = NULL; - dev_err(xpc_chan, "can't get memory for local get/put " - "values\n"); - return xpNoMemory; - } - - part->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, - GFP_KERNEL, - &part-> - remote_GPs_base); - if (part->remote_GPs == NULL) { - dev_err(xpc_chan, "can't get memory for remote get/put " - "values\n"); - kfree(part->local_GPs_base); - part->local_GPs = NULL; - kfree(part->channels); - part->channels = NULL; - return xpNoMemory; - } - - /* allocate all the required open and close args */ - - part->local_openclose_args = - xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL, - &part->local_openclose_args_base); - if (part->local_openclose_args == NULL) { - dev_err(xpc_chan, "can't get memory for local connect args\n"); - kfree(part->remote_GPs_base); - part->remote_GPs = NULL; - kfree(part->local_GPs_base); - part->local_GPs = NULL; - kfree(part->channels); - part->channels = NULL; - return xpNoMemory; - } - - part->remote_openclose_args = - xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL, - &part->remote_openclose_args_base); - if (part->remote_openclose_args == NULL) { - dev_err(xpc_chan, "can't get memory for remote connect args\n"); - kfree(part->local_openclose_args_base); - part->local_openclose_args = NULL; - kfree(part->remote_GPs_base); - part->remote_GPs = NULL; - kfree(part->local_GPs_base); - part->local_GPs = NULL; - kfree(part->channels); - part->channels = NULL; - return xpNoMemory; - } - - xpc_initialize_channels(part, partid); - - atomic_set(&part->nchannels_active, 0); - atomic_set(&part->nchannels_engaged, 0); - - /* local_IPI_amo were set to 0 by an earlier memset() */ - - /* Initialize this partitions AMO_t structure */ - part->local_IPI_amo_va = xpc_IPI_init(partid); - - spin_lock_init(&part->IPI_lock); - - atomic_set(&part->channel_mgr_requests, 1); - init_waitqueue_head(&part->channel_mgr_wq); - - sprintf(part->IPI_owner, "xpc%02d", partid); - ret = request_irq(SGI_XPC_NOTIFY, xpc_notify_IRQ_handler, IRQF_SHARED, - part->IPI_owner, (void *)(u64)partid); - if (ret != 0) { - dev_err(xpc_chan, "can't register NOTIFY IRQ handler, " - "errno=%d\n", -ret); - kfree(part->remote_openclose_args_base); - part->remote_openclose_args = NULL; - kfree(part->local_openclose_args_base); - part->local_openclose_args = NULL; - kfree(part->remote_GPs_base); - part->remote_GPs = NULL; - kfree(part->local_GPs_base); - part->local_GPs = NULL; - kfree(part->channels); - part->channels = NULL; - return xpLackOfResources; - } - - /* Setup a timer to check for dropped IPIs */ - timer = &part->dropped_IPI_timer; - init_timer(timer); - timer->function = (void (*)(unsigned long))xpc_dropped_IPI_check; - timer->data = (unsigned long)part; - timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT; - add_timer(timer); - - /* - * With the setting of the partition setup_state to XPC_P_SETUP, we're - * declaring that this partition is ready to go. - */ - part->setup_state = XPC_P_SETUP; - - /* - * Setup the per partition specific variables required by the - * remote partition to establish channel connections with us. - * - * The setting of the magic # indicates that these per partition - * specific variables are ready to be used. - */ - xpc_vars_part[partid].GPs_pa = __pa(part->local_GPs); - xpc_vars_part[partid].openclose_args_pa = - __pa(part->local_openclose_args); - xpc_vars_part[partid].IPI_amo_pa = __pa(part->local_IPI_amo_va); - cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */ - xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid); - xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid); - xpc_vars_part[partid].nchannels = part->nchannels; - xpc_vars_part[partid].magic = XPC_VP_MAGIC1; - - return xpSuccess; -} - -/* - * Create a wrapper that hides the underlying mechanism for pulling a cacheline - * (or multiple cachelines) from a remote partition. - * - * src must be a cacheline aligned physical address on the remote partition. - * dst must be a cacheline aligned virtual address on this partition. - * cnt must be an cacheline sized - */ -static enum xp_retval -xpc_pull_remote_cachelines(struct xpc_partition *part, void *dst, - const void *src, size_t cnt) -{ - bte_result_t bte_ret; - - DBUG_ON((u64)src != L1_CACHE_ALIGN((u64)src)); - DBUG_ON((u64)dst != L1_CACHE_ALIGN((u64)dst)); - DBUG_ON(cnt != L1_CACHE_ALIGN(cnt)); - - if (part->act_state == XPC_P_DEACTIVATING) - return part->reason; - - bte_ret = xp_bte_copy((u64)src, (u64)dst, (u64)cnt, - (BTE_NORMAL | BTE_WACQUIRE), NULL); - if (bte_ret == BTE_SUCCESS) - return xpSuccess; - - dev_dbg(xpc_chan, "xp_bte_copy() from partition %d failed, ret=%d\n", - XPC_PARTID(part), bte_ret); - - return xpc_map_bte_errors(bte_ret); -} - -/* - * Pull the remote per partition specific variables from the specified - * partition. - */ -enum xp_retval -xpc_pull_remote_vars_part(struct xpc_partition *part) -{ - u8 buffer[L1_CACHE_BYTES * 2]; - struct xpc_vars_part *pulled_entry_cacheline = - (struct xpc_vars_part *)L1_CACHE_ALIGN((u64)buffer); - struct xpc_vars_part *pulled_entry; - u64 remote_entry_cacheline_pa, remote_entry_pa; - short partid = XPC_PARTID(part); - enum xp_retval ret; - - /* pull the cacheline that contains the variables we're interested in */ - - DBUG_ON(part->remote_vars_part_pa != - L1_CACHE_ALIGN(part->remote_vars_part_pa)); - DBUG_ON(sizeof(struct xpc_vars_part) != L1_CACHE_BYTES / 2); - - remote_entry_pa = part->remote_vars_part_pa + - sn_partition_id * sizeof(struct xpc_vars_part); - - remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1)); - - pulled_entry = (struct xpc_vars_part *)((u64)pulled_entry_cacheline + - (remote_entry_pa & - (L1_CACHE_BYTES - 1))); - - ret = xpc_pull_remote_cachelines(part, pulled_entry_cacheline, - (void *)remote_entry_cacheline_pa, - L1_CACHE_BYTES); - if (ret != xpSuccess) { - dev_dbg(xpc_chan, "failed to pull XPC vars_part from " - "partition %d, ret=%d\n", partid, ret); - return ret; - } - - /* see if they've been set up yet */ - - if (pulled_entry->magic != XPC_VP_MAGIC1 && - pulled_entry->magic != XPC_VP_MAGIC2) { - - if (pulled_entry->magic != 0) { - dev_dbg(xpc_chan, "partition %d's XPC vars_part for " - "partition %d has bad magic value (=0x%lx)\n", - partid, sn_partition_id, pulled_entry->magic); - return xpBadMagic; - } - - /* they've not been initialized yet */ - return xpRetry; - } - - if (xpc_vars_part[partid].magic == XPC_VP_MAGIC1) { - - /* validate the variables */ - - if (pulled_entry->GPs_pa == 0 || - pulled_entry->openclose_args_pa == 0 || - pulled_entry->IPI_amo_pa == 0) { - - dev_err(xpc_chan, "partition %d's XPC vars_part for " - "partition %d are not valid\n", partid, - sn_partition_id); - return xpInvalidAddress; - } - - /* the variables we imported look to be valid */ - - part->remote_GPs_pa = pulled_entry->GPs_pa; - part->remote_openclose_args_pa = - pulled_entry->openclose_args_pa; - part->remote_IPI_amo_va = - (AMO_t *)__va(pulled_entry->IPI_amo_pa); - part->remote_IPI_nasid = pulled_entry->IPI_nasid; - part->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid; - - if (part->nchannels > pulled_entry->nchannels) - part->nchannels = pulled_entry->nchannels; - - /* let the other side know that we've pulled their variables */ - - xpc_vars_part[partid].magic = XPC_VP_MAGIC2; - } - - if (pulled_entry->magic == XPC_VP_MAGIC1) - return xpRetry; - - return xpSuccess; -} - -/* - * Get the IPI flags and pull the openclose args and/or remote GPs as needed. - */ -static u64 -xpc_get_IPI_flags(struct xpc_partition *part) -{ - unsigned long irq_flags; - u64 IPI_amo; - enum xp_retval ret; - - /* - * See if there are any IPI flags to be handled. - */ - - spin_lock_irqsave(&part->IPI_lock, irq_flags); - IPI_amo = part->local_IPI_amo; - if (IPI_amo != 0) - part->local_IPI_amo = 0; - - spin_unlock_irqrestore(&part->IPI_lock, irq_flags); - - if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) { - ret = xpc_pull_remote_cachelines(part, - part->remote_openclose_args, - (void *)part-> - remote_openclose_args_pa, - XPC_OPENCLOSE_ARGS_SIZE); - if (ret != xpSuccess) { - XPC_DEACTIVATE_PARTITION(part, ret); - - dev_dbg(xpc_chan, "failed to pull openclose args from " - "partition %d, ret=%d\n", XPC_PARTID(part), - ret); - - /* don't bother processing IPIs anymore */ - IPI_amo = 0; - } - } - - if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) { - ret = xpc_pull_remote_cachelines(part, part->remote_GPs, - (void *)part->remote_GPs_pa, - XPC_GP_SIZE); - if (ret != xpSuccess) { - XPC_DEACTIVATE_PARTITION(part, ret); - - dev_dbg(xpc_chan, "failed to pull GPs from partition " - "%d, ret=%d\n", XPC_PARTID(part), ret); - - /* don't bother processing IPIs anymore */ - IPI_amo = 0; - } - } - - return IPI_amo; -} - -/* - * Allocate the local message queue and the notify queue. - */ -static enum xp_retval -xpc_allocate_local_msgqueue(struct xpc_channel *ch) -{ - unsigned long irq_flags; - int nentries; - size_t nbytes; - - for (nentries = ch->local_nentries; nentries > 0; nentries--) { - - nbytes = nentries * ch->msg_size; - ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes, - GFP_KERNEL, - &ch->local_msgqueue_base); - if (ch->local_msgqueue == NULL) - continue; - - nbytes = nentries * sizeof(struct xpc_notify); - ch->notify_queue = kzalloc(nbytes, GFP_KERNEL); - if (ch->notify_queue == NULL) { - kfree(ch->local_msgqueue_base); - ch->local_msgqueue = NULL; - continue; - } - - spin_lock_irqsave(&ch->lock, irq_flags); - if (nentries < ch->local_nentries) { - dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, " - "partid=%d, channel=%d\n", nentries, - ch->local_nentries, ch->partid, ch->number); - - ch->local_nentries = nentries; - } - spin_unlock_irqrestore(&ch->lock, irq_flags); - return xpSuccess; - } - - dev_dbg(xpc_chan, "can't get memory for local message queue and notify " - "queue, partid=%d, channel=%d\n", ch->partid, ch->number); - return xpNoMemory; -} - -/* - * Allocate the cached remote message queue. - */ -static enum xp_retval -xpc_allocate_remote_msgqueue(struct xpc_channel *ch) -{ - unsigned long irq_flags; - int nentries; - size_t nbytes; - - DBUG_ON(ch->remote_nentries <= 0); - - for (nentries = ch->remote_nentries; nentries > 0; nentries--) { - - nbytes = nentries * ch->msg_size; - ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes, - GFP_KERNEL, - &ch->remote_msgqueue_base); - if (ch->remote_msgqueue == NULL) - continue; - - spin_lock_irqsave(&ch->lock, irq_flags); - if (nentries < ch->remote_nentries) { - dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, " - "partid=%d, channel=%d\n", nentries, - ch->remote_nentries, ch->partid, ch->number); - - ch->remote_nentries = nentries; - } - spin_unlock_irqrestore(&ch->lock, irq_flags); - return xpSuccess; - } - - dev_dbg(xpc_chan, "can't get memory for cached remote message queue, " - "partid=%d, channel=%d\n", ch->partid, ch->number); - return xpNoMemory; -} - -/* - * Allocate message queues and other stuff associated with a channel. - * - * Note: Assumes all of the channel sizes are filled in. - */ -static enum xp_retval -xpc_allocate_msgqueues(struct xpc_channel *ch) -{ - unsigned long irq_flags; - enum xp_retval ret; - - DBUG_ON(ch->flags & XPC_C_SETUP); - - ret = xpc_allocate_local_msgqueue(ch); - if (ret != xpSuccess) - return ret; - - ret = xpc_allocate_remote_msgqueue(ch); - if (ret != xpSuccess) { - kfree(ch->local_msgqueue_base); - ch->local_msgqueue = NULL; - kfree(ch->notify_queue); - ch->notify_queue = NULL; - return ret; - } - - spin_lock_irqsave(&ch->lock, irq_flags); - ch->flags |= XPC_C_SETUP; - spin_unlock_irqrestore(&ch->lock, irq_flags); - - return xpSuccess; -} - -/* * Process a connect message from a remote partition. * * Note: xpc_process_connect() is expecting to be called with the @@ -565,30 +39,29 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags) if (!(ch->flags & XPC_C_SETUP)) { spin_unlock_irqrestore(&ch->lock, *irq_flags); - ret = xpc_allocate_msgqueues(ch); + ret = xpc_setup_msg_structures(ch); spin_lock_irqsave(&ch->lock, *irq_flags); if (ret != xpSuccess) XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags); + ch->flags |= XPC_C_SETUP; + if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING)) return; - DBUG_ON(!(ch->flags & XPC_C_SETUP)); DBUG_ON(ch->local_msgqueue == NULL); DBUG_ON(ch->remote_msgqueue == NULL); } if (!(ch->flags & XPC_C_OPENREPLY)) { ch->flags |= XPC_C_OPENREPLY; - xpc_IPI_send_openreply(ch, irq_flags); + xpc_send_chctl_openreply(ch, irq_flags); } if (!(ch->flags & XPC_C_ROPENREPLY)) return; - DBUG_ON(ch->remote_msgqueue_pa == 0); - ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */ dev_info(xpc_chan, "channel %d to partition %d connected\n", @@ -600,99 +73,6 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags) } /* - * Notify those who wanted to be notified upon delivery of their message. - */ -static void -xpc_notify_senders(struct xpc_channel *ch, enum xp_retval reason, s64 put) -{ - struct xpc_notify *notify; - u8 notify_type; - s64 get = ch->w_remote_GP.get - 1; - - while (++get < put && atomic_read(&ch->n_to_notify) > 0) { - - notify = &ch->notify_queue[get % ch->local_nentries]; - - /* - * See if the notify entry indicates it was associated with - * a message who's sender wants to be notified. It is possible - * that it is, but someone else is doing or has done the - * notification. - */ - notify_type = notify->type; - if (notify_type == 0 || - cmpxchg(¬ify->type, notify_type, 0) != notify_type) { - continue; - } - - DBUG_ON(notify_type != XPC_N_CALL); - - atomic_dec(&ch->n_to_notify); - - if (notify->func != NULL) { - dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, " - "msg_number=%ld, partid=%d, channel=%d\n", - (void *)notify, get, ch->partid, ch->number); - - notify->func(reason, ch->partid, ch->number, - notify->key); - - dev_dbg(xpc_chan, "notify->func() returned, " - "notify=0x%p, msg_number=%ld, partid=%d, " - "channel=%d\n", (void *)notify, get, - ch->partid, ch->number); - } - } -} - -/* - * Free up message queues and other stuff that were allocated for the specified - * channel. - * - * Note: ch->reason and ch->reason_line are left set for debugging purposes, - * they're cleared when XPC_C_DISCONNECTED is cleared. - */ -static void -xpc_free_msgqueues(struct xpc_channel *ch) -{ - DBUG_ON(!spin_is_locked(&ch->lock)); - DBUG_ON(atomic_read(&ch->n_to_notify) != 0); - - ch->remote_msgqueue_pa = 0; - ch->func = NULL; - ch->key = NULL; - ch->msg_size = 0; - ch->local_nentries = 0; - ch->remote_nentries = 0; - ch->kthreads_assigned_limit = 0; - ch->kthreads_idle_limit = 0; - - ch->local_GP->get = 0; - ch->local_GP->put = 0; - ch->remote_GP.get = 0; - ch->remote_GP.put = 0; - ch->w_local_GP.get = 0; - ch->w_local_GP.put = 0; - ch->w_remote_GP.get = 0; - ch->w_remote_GP.put = 0; - ch->next_msg_to_pull = 0; - - if (ch->flags & XPC_C_SETUP) { - ch->flags &= ~XPC_C_SETUP; - - dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n", - ch->flags, ch->partid, ch->number); - - kfree(ch->local_msgqueue_base); - ch->local_msgqueue = NULL; - kfree(ch->remote_msgqueue_base); - ch->remote_msgqueue = NULL; - kfree(ch->notify_queue); - ch->notify_queue = NULL; - } -} - -/* * spin_lock_irqsave() is expected to be held on entry. */ static void @@ -717,9 +97,9 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) && !(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE)); - if (part->act_state == XPC_P_DEACTIVATING) { + if (part->act_state == XPC_P_AS_DEACTIVATING) { /* can't proceed until the other side disengages from us */ - if (xpc_partition_engaged(1UL << ch->partid)) + if (xpc_partition_engaged(ch->partid)) return; } else { @@ -731,7 +111,7 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) if (!(ch->flags & XPC_C_CLOSEREPLY)) { ch->flags |= XPC_C_CLOSEREPLY; - xpc_IPI_send_closereply(ch, irq_flags); + xpc_send_chctl_closereply(ch, irq_flags); } if (!(ch->flags & XPC_C_RCLOSEREPLY)) @@ -740,8 +120,8 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) /* wake those waiting for notify completion */ if (atomic_read(&ch->n_to_notify) > 0) { - /* >>> we do callout while holding ch->lock */ - xpc_notify_senders(ch, ch->reason, ch->w_local_GP.put); + /* we do callout while holding ch->lock, callout can't block */ + xpc_notify_senders_of_disconnect(ch); } /* both sides are disconnected now */ @@ -752,10 +132,24 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) spin_lock_irqsave(&ch->lock, *irq_flags); } + DBUG_ON(atomic_read(&ch->n_to_notify) != 0); + /* it's now safe to free the channel's message queues */ - xpc_free_msgqueues(ch); + xpc_teardown_msg_structures(ch); - /* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */ + ch->func = NULL; + ch->key = NULL; + ch->entry_size = 0; + ch->local_nentries = 0; + ch->remote_nentries = 0; + ch->kthreads_assigned_limit = 0; + ch->kthreads_idle_limit = 0; + + /* + * Mark the channel disconnected and clear all other flags, including + * XPC_C_SETUP (because of call to xpc_teardown_msg_structures()) but + * not including XPC_C_WDISCONNECT (if it was set). + */ ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT)); atomic_dec(&part->nchannels_active); @@ -768,15 +162,15 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) if (ch->flags & XPC_C_WDISCONNECT) { /* we won't lose the CPU since we're holding ch->lock */ complete(&ch->wdisconnect_wait); - } else if (ch->delayed_IPI_flags) { - if (part->act_state != XPC_P_DEACTIVATING) { - /* time to take action on any delayed IPI flags */ - spin_lock(&part->IPI_lock); - XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number, - ch->delayed_IPI_flags); - spin_unlock(&part->IPI_lock); + } else if (ch->delayed_chctl_flags) { + if (part->act_state != XPC_P_AS_DEACTIVATING) { + /* time to take action on any delayed chctl flags */ + spin_lock(&part->chctl_lock); + part->chctl.flags[ch->number] |= + ch->delayed_chctl_flags; + spin_unlock(&part->chctl_lock); } - ch->delayed_IPI_flags = 0; + ch->delayed_chctl_flags = 0; } } @@ -784,8 +178,8 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) * Process a change in the channel's remote connection state. */ static void -xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number, - u8 IPI_flags) +xpc_process_openclose_chctl_flags(struct xpc_partition *part, int ch_number, + u8 chctl_flags) { unsigned long irq_flags; struct xpc_openclose_args *args = @@ -800,24 +194,24 @@ again: if ((ch->flags & XPC_C_DISCONNECTED) && (ch->flags & XPC_C_WDISCONNECT)) { /* - * Delay processing IPI flags until thread waiting disconnect + * Delay processing chctl flags until thread waiting disconnect * has had a chance to see that the channel is disconnected. */ - ch->delayed_IPI_flags |= IPI_flags; + ch->delayed_chctl_flags |= chctl_flags; spin_unlock_irqrestore(&ch->lock, irq_flags); return; } - if (IPI_flags & XPC_IPI_CLOSEREQUEST) { + if (chctl_flags & XPC_CHCTL_CLOSEREQUEST) { - dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received " + dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREQUEST (reason=%d) received " "from partid=%d, channel=%d\n", args->reason, ch->partid, ch->number); /* * If RCLOSEREQUEST is set, we're probably waiting for * RCLOSEREPLY. We should find it and a ROPENREQUEST packed - * with this RCLOSEREQUEST in the IPI_flags. + * with this RCLOSEREQUEST in the chctl_flags. */ if (ch->flags & XPC_C_RCLOSEREQUEST) { @@ -826,8 +220,8 @@ again: DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY)); DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY); - DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY)); - IPI_flags &= ~XPC_IPI_CLOSEREPLY; + DBUG_ON(!(chctl_flags & XPC_CHCTL_CLOSEREPLY)); + chctl_flags &= ~XPC_CHCTL_CLOSEREPLY; ch->flags |= XPC_C_RCLOSEREPLY; /* both sides have finished disconnecting */ @@ -837,17 +231,15 @@ again: } if (ch->flags & XPC_C_DISCONNECTED) { - if (!(IPI_flags & XPC_IPI_OPENREQUEST)) { - if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, - ch_number) & - XPC_IPI_OPENREQUEST)) { - - DBUG_ON(ch->delayed_IPI_flags != 0); - spin_lock(&part->IPI_lock); - XPC_SET_IPI_FLAGS(part->local_IPI_amo, - ch_number, - XPC_IPI_CLOSEREQUEST); - spin_unlock(&part->IPI_lock); + if (!(chctl_flags & XPC_CHCTL_OPENREQUEST)) { + if (part->chctl.flags[ch_number] & + XPC_CHCTL_OPENREQUEST) { + + DBUG_ON(ch->delayed_chctl_flags != 0); + spin_lock(&part->chctl_lock); + part->chctl.flags[ch_number] |= + XPC_CHCTL_CLOSEREQUEST; + spin_unlock(&part->chctl_lock); } spin_unlock_irqrestore(&ch->lock, irq_flags); return; @@ -860,7 +252,7 @@ again: ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST); } - IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY); + chctl_flags &= ~(XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY); /* * The meaningful CLOSEREQUEST connection state fields are: @@ -878,7 +270,7 @@ again: XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags); - DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY); + DBUG_ON(chctl_flags & XPC_CHCTL_CLOSEREPLY); spin_unlock_irqrestore(&ch->lock, irq_flags); return; } @@ -886,13 +278,13 @@ again: xpc_process_disconnect(ch, &irq_flags); } - if (IPI_flags & XPC_IPI_CLOSEREPLY) { + if (chctl_flags & XPC_CHCTL_CLOSEREPLY) { - dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d," - " channel=%d\n", ch->partid, ch->number); + dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREPLY received from partid=" + "%d, channel=%d\n", ch->partid, ch->number); if (ch->flags & XPC_C_DISCONNECTED) { - DBUG_ON(part->act_state != XPC_P_DEACTIVATING); + DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING); spin_unlock_irqrestore(&ch->lock, irq_flags); return; } @@ -900,15 +292,14 @@ again: DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST)); if (!(ch->flags & XPC_C_RCLOSEREQUEST)) { - if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number) - & XPC_IPI_CLOSEREQUEST)) { - - DBUG_ON(ch->delayed_IPI_flags != 0); - spin_lock(&part->IPI_lock); - XPC_SET_IPI_FLAGS(part->local_IPI_amo, - ch_number, - XPC_IPI_CLOSEREPLY); - spin_unlock(&part->IPI_lock); + if (part->chctl.flags[ch_number] & + XPC_CHCTL_CLOSEREQUEST) { + + DBUG_ON(ch->delayed_chctl_flags != 0); + spin_lock(&part->chctl_lock); + part->chctl.flags[ch_number] |= + XPC_CHCTL_CLOSEREPLY; + spin_unlock(&part->chctl_lock); } spin_unlock_irqrestore(&ch->lock, irq_flags); return; @@ -922,21 +313,21 @@ again: } } - if (IPI_flags & XPC_IPI_OPENREQUEST) { + if (chctl_flags & XPC_CHCTL_OPENREQUEST) { - dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, " + dev_dbg(xpc_chan, "XPC_CHCTL_OPENREQUEST (entry_size=%d, " "local_nentries=%d) received from partid=%d, " - "channel=%d\n", args->msg_size, args->local_nentries, + "channel=%d\n", args->entry_size, args->local_nentries, ch->partid, ch->number); - if (part->act_state == XPC_P_DEACTIVATING || + if (part->act_state == XPC_P_AS_DEACTIVATING || (ch->flags & XPC_C_ROPENREQUEST)) { spin_unlock_irqrestore(&ch->lock, irq_flags); return; } if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) { - ch->delayed_IPI_flags |= XPC_IPI_OPENREQUEST; + ch->delayed_chctl_flags |= XPC_CHCTL_OPENREQUEST; spin_unlock_irqrestore(&ch->lock, irq_flags); return; } @@ -947,10 +338,10 @@ again: /* * The meaningful OPENREQUEST connection state fields are: - * msg_size = size of channel's messages in bytes + * entry_size = size of channel's messages in bytes * local_nentries = remote partition's local_nentries */ - if (args->msg_size == 0 || args->local_nentries == 0) { + if (args->entry_size == 0 || args->local_nentries == 0) { /* assume OPENREQUEST was delayed by mistake */ spin_unlock_irqrestore(&ch->lock, irq_flags); return; @@ -960,14 +351,14 @@ again: ch->remote_nentries = args->local_nentries; if (ch->flags & XPC_C_OPENREQUEST) { - if (args->msg_size != ch->msg_size) { + if (args->entry_size != ch->entry_size) { XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes, &irq_flags); spin_unlock_irqrestore(&ch->lock, irq_flags); return; } } else { - ch->msg_size = args->msg_size; + ch->entry_size = args->entry_size; XPC_SET_REASON(ch, 0, 0); ch->flags &= ~XPC_C_DISCONNECTED; @@ -978,13 +369,13 @@ again: xpc_process_connect(ch, &irq_flags); } - if (IPI_flags & XPC_IPI_OPENREPLY) { + if (chctl_flags & XPC_CHCTL_OPENREPLY) { - dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, " - "local_nentries=%d, remote_nentries=%d) received from " - "partid=%d, channel=%d\n", args->local_msgqueue_pa, - args->local_nentries, args->remote_nentries, - ch->partid, ch->number); + dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY (local_msgqueue_pa=" + "0x%lx, local_nentries=%d, remote_nentries=%d) " + "received from partid=%d, channel=%d\n", + args->local_msgqueue_pa, args->local_nentries, + args->remote_nentries, ch->partid, ch->number); if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) { spin_unlock_irqrestore(&ch->lock, irq_flags); @@ -1012,10 +403,10 @@ again: DBUG_ON(args->remote_nentries == 0); ch->flags |= XPC_C_ROPENREPLY; - ch->remote_msgqueue_pa = args->local_msgqueue_pa; + xpc_save_remote_msgqueue_pa(ch, args->local_msgqueue_pa); if (args->local_nentries < ch->remote_nentries) { - dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new " + dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new " "remote_nentries=%d, old remote_nentries=%d, " "partid=%d, channel=%d\n", args->local_nentries, ch->remote_nentries, @@ -1024,7 +415,7 @@ again: ch->remote_nentries = args->local_nentries; } if (args->remote_nentries < ch->local_nentries) { - dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new " + dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new " "local_nentries=%d, old local_nentries=%d, " "partid=%d, channel=%d\n", args->remote_nentries, ch->local_nentries, @@ -1082,7 +473,7 @@ xpc_connect_channel(struct xpc_channel *ch) ch->local_nentries = registration->nentries; if (ch->flags & XPC_C_ROPENREQUEST) { - if (registration->msg_size != ch->msg_size) { + if (registration->entry_size != ch->entry_size) { /* the local and remote sides aren't the same */ /* @@ -1101,7 +492,7 @@ xpc_connect_channel(struct xpc_channel *ch) return xpUnequalMsgSizes; } } else { - ch->msg_size = registration->msg_size; + ch->entry_size = registration->entry_size; XPC_SET_REASON(ch, 0, 0); ch->flags &= ~XPC_C_DISCONNECTED; @@ -1114,7 +505,7 @@ xpc_connect_channel(struct xpc_channel *ch) /* initiate the connection */ ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING); - xpc_IPI_send_openrequest(ch, &irq_flags); + xpc_send_chctl_openrequest(ch, &irq_flags); xpc_process_connect(ch, &irq_flags); @@ -1123,152 +514,16 @@ xpc_connect_channel(struct xpc_channel *ch) return xpSuccess; } -/* - * Clear some of the msg flags in the local message queue. - */ -static inline void -xpc_clear_local_msgqueue_flags(struct xpc_channel *ch) -{ - struct xpc_msg *msg; - s64 get; - - get = ch->w_remote_GP.get; - do { - msg = (struct xpc_msg *)((u64)ch->local_msgqueue + - (get % ch->local_nentries) * - ch->msg_size); - msg->flags = 0; - } while (++get < ch->remote_GP.get); -} - -/* - * Clear some of the msg flags in the remote message queue. - */ -static inline void -xpc_clear_remote_msgqueue_flags(struct xpc_channel *ch) -{ - struct xpc_msg *msg; - s64 put; - - put = ch->w_remote_GP.put; - do { - msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + - (put % ch->remote_nentries) * - ch->msg_size); - msg->flags = 0; - } while (++put < ch->remote_GP.put); -} - -static void -xpc_process_msg_IPI(struct xpc_partition *part, int ch_number) -{ - struct xpc_channel *ch = &part->channels[ch_number]; - int nmsgs_sent; - - ch->remote_GP = part->remote_GPs[ch_number]; - - /* See what, if anything, has changed for each connected channel */ - - xpc_msgqueue_ref(ch); - - if (ch->w_remote_GP.get == ch->remote_GP.get && - ch->w_remote_GP.put == ch->remote_GP.put) { - /* nothing changed since GPs were last pulled */ - xpc_msgqueue_deref(ch); - return; - } - - if (!(ch->flags & XPC_C_CONNECTED)) { - xpc_msgqueue_deref(ch); - return; - } - - /* - * First check to see if messages recently sent by us have been - * received by the other side. (The remote GET value will have - * changed since we last looked at it.) - */ - - if (ch->w_remote_GP.get != ch->remote_GP.get) { - - /* - * We need to notify any senders that want to be notified - * that their sent messages have been received by their - * intended recipients. We need to do this before updating - * w_remote_GP.get so that we don't allocate the same message - * queue entries prematurely (see xpc_allocate_msg()). - */ - if (atomic_read(&ch->n_to_notify) > 0) { - /* - * Notify senders that messages sent have been - * received and delivered by the other side. - */ - xpc_notify_senders(ch, xpMsgDelivered, - ch->remote_GP.get); - } - - /* - * Clear msg->flags in previously sent messages, so that - * they're ready for xpc_allocate_msg(). - */ - xpc_clear_local_msgqueue_flags(ch); - - ch->w_remote_GP.get = ch->remote_GP.get; - - dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, " - "channel=%d\n", ch->w_remote_GP.get, ch->partid, - ch->number); - - /* - * If anyone was waiting for message queue entries to become - * available, wake them up. - */ - if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) - wake_up(&ch->msg_allocate_wq); - } - - /* - * Now check for newly sent messages by the other side. (The remote - * PUT value will have changed since we last looked at it.) - */ - - if (ch->w_remote_GP.put != ch->remote_GP.put) { - /* - * Clear msg->flags in previously received messages, so that - * they're ready for xpc_get_deliverable_msg(). - */ - xpc_clear_remote_msgqueue_flags(ch); - - ch->w_remote_GP.put = ch->remote_GP.put; - - dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, " - "channel=%d\n", ch->w_remote_GP.put, ch->partid, - ch->number); - - nmsgs_sent = ch->w_remote_GP.put - ch->w_local_GP.get; - if (nmsgs_sent > 0) { - dev_dbg(xpc_chan, "msgs waiting to be copied and " - "delivered=%d, partid=%d, channel=%d\n", - nmsgs_sent, ch->partid, ch->number); - - if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) - xpc_activate_kthreads(ch, nmsgs_sent); - } - } - - xpc_msgqueue_deref(ch); -} - void -xpc_process_channel_activity(struct xpc_partition *part) +xpc_process_sent_chctl_flags(struct xpc_partition *part) { unsigned long irq_flags; - u64 IPI_amo, IPI_flags; + union xpc_channel_ctl_flags chctl; struct xpc_channel *ch; int ch_number; u32 ch_flags; - IPI_amo = xpc_get_IPI_flags(part); + chctl.all_flags = xpc_get_chctl_all_flags(part); /* * Initiate channel connections for registered channels. @@ -1281,14 +536,14 @@ xpc_process_channel_activity(struct xpc_partition *part) ch = &part->channels[ch_number]; /* - * Process any open or close related IPI flags, and then deal + * Process any open or close related chctl flags, and then deal * with connecting or disconnecting the channel as required. */ - IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number); - - if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags)) - xpc_process_openclose_IPI(part, ch_number, IPI_flags); + if (chctl.flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) { + xpc_process_openclose_chctl_flags(part, ch_number, + chctl.flags[ch_number]); + } ch_flags = ch->flags; /* need an atomic snapshot of flags */ @@ -1299,7 +554,7 @@ xpc_process_channel_activity(struct xpc_partition *part) continue; } - if (part->act_state == XPC_P_DEACTIVATING) + if (part->act_state == XPC_P_AS_DEACTIVATING) continue; if (!(ch_flags & XPC_C_CONNECTED)) { @@ -1315,13 +570,13 @@ xpc_process_channel_activity(struct xpc_partition *part) } /* - * Process any message related IPI flags, this may involve the - * activation of kthreads to deliver any pending messages sent - * from the other partition. + * Process any message related chctl flags, this may involve + * the activation of kthreads to deliver any pending messages + * sent from the other partition. */ - if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags)) - xpc_process_msg_IPI(part, ch_number); + if (chctl.flags[ch_number] & XPC_MSG_CHCTL_FLAGS) + xpc_process_msg_chctl_flags(part, ch_number); } } @@ -1369,59 +624,6 @@ xpc_partition_going_down(struct xpc_partition *part, enum xp_retval reason) } /* - * Teardown the infrastructure necessary to support XPartition Communication - * between the specified remote partition and the local one. - */ -void -xpc_teardown_infrastructure(struct xpc_partition *part) -{ - short partid = XPC_PARTID(part); - - /* - * We start off by making this partition inaccessible to local - * processes by marking it as no longer setup. Then we make it - * inaccessible to remote processes by clearing the XPC per partition - * specific variable's magic # (which indicates that these variables - * are no longer valid) and by ignoring all XPC notify IPIs sent to - * this partition. - */ - - DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); - DBUG_ON(atomic_read(&part->nchannels_active) != 0); - DBUG_ON(part->setup_state != XPC_P_SETUP); - part->setup_state = XPC_P_WTEARDOWN; - - xpc_vars_part[partid].magic = 0; - - free_irq(SGI_XPC_NOTIFY, (void *)(u64)partid); - - /* - * Before proceeding with the teardown we have to wait until all - * existing references cease. - */ - wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); - - /* now we can begin tearing down the infrastructure */ - - part->setup_state = XPC_P_TORNDOWN; - - /* in case we've still got outstanding timers registered... */ - del_timer_sync(&part->dropped_IPI_timer); - - kfree(part->remote_openclose_args_base); - part->remote_openclose_args = NULL; - kfree(part->local_openclose_args_base); - part->local_openclose_args = NULL; - kfree(part->remote_GPs_base); - part->remote_GPs = NULL; - kfree(part->local_GPs_base); - part->local_GPs = NULL; - kfree(part->channels); - part->channels = NULL; - part->local_IPI_amo_va = NULL; -} - -/* * Called by XP at the time of channel connection registration to cause * XPC to establish connections to all currently active partitions. */ @@ -1432,9 +634,9 @@ xpc_initiate_connect(int ch_number) struct xpc_partition *part; struct xpc_channel *ch; - DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { + for (partid = 0; partid < xp_max_npartitions; partid++) { part = &xpc_partitions[partid]; if (xpc_part_ref(part)) { @@ -1488,10 +690,10 @@ xpc_initiate_disconnect(int ch_number) struct xpc_partition *part; struct xpc_channel *ch; - DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS); + DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); /* initiate the channel disconnect for every active partition */ - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { + for (partid = 0; partid < xp_max_npartitions; partid++) { part = &xpc_partitions[partid]; if (xpc_part_ref(part)) { @@ -1550,7 +752,7 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch, XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY | XPC_C_CONNECTING | XPC_C_CONNECTED); - xpc_IPI_send_closerequest(ch, irq_flags); + xpc_send_chctl_closerequest(ch, irq_flags); if (channel_was_connected) ch->flags |= XPC_C_WASCONNECTED; @@ -1598,7 +800,7 @@ xpc_disconnect_callout(struct xpc_channel *ch, enum xp_retval reason) * Wait for a message entry to become available for the specified channel, * but don't wait any longer than 1 jiffy. */ -static enum xp_retval +enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *ch) { enum xp_retval ret; @@ -1625,315 +827,54 @@ xpc_allocate_msg_wait(struct xpc_channel *ch) } /* - * Allocate an entry for a message from the message queue associated with the - * specified channel. - */ -static enum xp_retval -xpc_allocate_msg(struct xpc_channel *ch, u32 flags, - struct xpc_msg **address_of_msg) -{ - struct xpc_msg *msg; - enum xp_retval ret; - s64 put; - - /* this reference will be dropped in xpc_send_msg() */ - xpc_msgqueue_ref(ch); - - if (ch->flags & XPC_C_DISCONNECTING) { - xpc_msgqueue_deref(ch); - return ch->reason; - } - if (!(ch->flags & XPC_C_CONNECTED)) { - xpc_msgqueue_deref(ch); - return xpNotConnected; - } - - /* - * Get the next available message entry from the local message queue. - * If none are available, we'll make sure that we grab the latest - * GP values. - */ - ret = xpTimeout; - - while (1) { - - put = ch->w_local_GP.put; - rmb(); /* guarantee that .put loads before .get */ - if (put - ch->w_remote_GP.get < ch->local_nentries) { - - /* There are available message entries. We need to try - * to secure one for ourselves. We'll do this by trying - * to increment w_local_GP.put as long as someone else - * doesn't beat us to it. If they do, we'll have to - * try again. - */ - if (cmpxchg(&ch->w_local_GP.put, put, put + 1) == put) { - /* we got the entry referenced by put */ - break; - } - continue; /* try again */ - } - - /* - * There aren't any available msg entries at this time. - * - * In waiting for a message entry to become available, - * we set a timeout in case the other side is not - * sending completion IPIs. This lets us fake an IPI - * that will cause the IPI handler to fetch the latest - * GP values as if an IPI was sent by the other side. - */ - if (ret == xpTimeout) - xpc_IPI_send_local_msgrequest(ch); - - if (flags & XPC_NOWAIT) { - xpc_msgqueue_deref(ch); - return xpNoWait; - } - - ret = xpc_allocate_msg_wait(ch); - if (ret != xpInterrupted && ret != xpTimeout) { - xpc_msgqueue_deref(ch); - return ret; - } - } - - /* get the message's address and initialize it */ - msg = (struct xpc_msg *)((u64)ch->local_msgqueue + - (put % ch->local_nentries) * ch->msg_size); - - DBUG_ON(msg->flags != 0); - msg->number = put; - - dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, " - "msg_number=%ld, partid=%d, channel=%d\n", put + 1, - (void *)msg, msg->number, ch->partid, ch->number); - - *address_of_msg = msg; - - return xpSuccess; -} - -/* - * Allocate an entry for a message from the message queue associated with the - * specified channel. NOTE that this routine can sleep waiting for a message - * entry to become available. To not sleep, pass in the XPC_NOWAIT flag. + * Send a message that contains the user's payload on the specified channel + * connected to the specified partition. * - * Arguments: + * NOTE that this routine can sleep waiting for a message entry to become + * available. To not sleep, pass in the XPC_NOWAIT flag. * - * partid - ID of partition to which the channel is connected. - * ch_number - channel #. - * flags - see xpc.h for valid flags. - * payload - address of the allocated payload area pointer (filled in on - * return) in which the user-defined message is constructed. - */ -enum xp_retval -xpc_initiate_allocate(short partid, int ch_number, u32 flags, void **payload) -{ - struct xpc_partition *part = &xpc_partitions[partid]; - enum xp_retval ret = xpUnknownReason; - struct xpc_msg *msg = NULL; - - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); - DBUG_ON(ch_number < 0 || ch_number >= part->nchannels); - - *payload = NULL; - - if (xpc_part_ref(part)) { - ret = xpc_allocate_msg(&part->channels[ch_number], flags, &msg); - xpc_part_deref(part); - - if (msg != NULL) - *payload = &msg->payload; - } - - return ret; -} - -/* - * Now we actually send the messages that are ready to be sent by advancing - * the local message queue's Put value and then send an IPI to the recipient - * partition. - */ -static void -xpc_send_msgs(struct xpc_channel *ch, s64 initial_put) -{ - struct xpc_msg *msg; - s64 put = initial_put + 1; - int send_IPI = 0; - - while (1) { - - while (1) { - if (put == ch->w_local_GP.put) - break; - - msg = (struct xpc_msg *)((u64)ch->local_msgqueue + - (put % ch->local_nentries) * - ch->msg_size); - - if (!(msg->flags & XPC_M_READY)) - break; - - put++; - } - - if (put == initial_put) { - /* nothing's changed */ - break; - } - - if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) != - initial_put) { - /* someone else beat us to it */ - DBUG_ON(ch->local_GP->put < initial_put); - break; - } - - /* we just set the new value of local_GP->put */ - - dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, " - "channel=%d\n", put, ch->partid, ch->number); - - send_IPI = 1; - - /* - * We need to ensure that the message referenced by - * local_GP->put is not XPC_M_READY or that local_GP->put - * equals w_local_GP.put, so we'll go have a look. - */ - initial_put = put; - } - - if (send_IPI) - xpc_IPI_send_msgrequest(ch); -} - -/* - * Common code that does the actual sending of the message by advancing the - * local message queue's Put value and sends an IPI to the partition the - * message is being sent to. - */ -static enum xp_retval -xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type, - xpc_notify_func func, void *key) -{ - enum xp_retval ret = xpSuccess; - struct xpc_notify *notify = notify; - s64 put, msg_number = msg->number; - - DBUG_ON(notify_type == XPC_N_CALL && func == NULL); - DBUG_ON((((u64)msg - (u64)ch->local_msgqueue) / ch->msg_size) != - msg_number % ch->local_nentries); - DBUG_ON(msg->flags & XPC_M_READY); - - if (ch->flags & XPC_C_DISCONNECTING) { - /* drop the reference grabbed in xpc_allocate_msg() */ - xpc_msgqueue_deref(ch); - return ch->reason; - } - - if (notify_type != 0) { - /* - * Tell the remote side to send an ACK interrupt when the - * message has been delivered. - */ - msg->flags |= XPC_M_INTERRUPT; - - atomic_inc(&ch->n_to_notify); - - notify = &ch->notify_queue[msg_number % ch->local_nentries]; - notify->func = func; - notify->key = key; - notify->type = notify_type; - - /* >>> is a mb() needed here? */ - - if (ch->flags & XPC_C_DISCONNECTING) { - /* - * An error occurred between our last error check and - * this one. We will try to clear the type field from - * the notify entry. If we succeed then - * xpc_disconnect_channel() didn't already process - * the notify entry. - */ - if (cmpxchg(¬ify->type, notify_type, 0) == - notify_type) { - atomic_dec(&ch->n_to_notify); - ret = ch->reason; - } - - /* drop the reference grabbed in xpc_allocate_msg() */ - xpc_msgqueue_deref(ch); - return ret; - } - } - - msg->flags |= XPC_M_READY; - - /* - * The preceding store of msg->flags must occur before the following - * load of ch->local_GP->put. - */ - mb(); - - /* see if the message is next in line to be sent, if so send it */ - - put = ch->local_GP->put; - if (put == msg_number) - xpc_send_msgs(ch, put); - - /* drop the reference grabbed in xpc_allocate_msg() */ - xpc_msgqueue_deref(ch); - return ret; -} - -/* - * Send a message previously allocated using xpc_initiate_allocate() on the - * specified channel connected to the specified partition. - * - * This routine will not wait for the message to be received, nor will - * notification be given when it does happen. Once this routine has returned - * the message entry allocated via xpc_initiate_allocate() is no longer - * accessable to the caller. - * - * This routine, although called by users, does not call xpc_part_ref() to - * ensure that the partition infrastructure is in place. It relies on the - * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg(). + * Once sent, this routine will not wait for the message to be received, nor + * will notification be given when it does happen. * * Arguments: * * partid - ID of partition to which the channel is connected. * ch_number - channel # to send message on. - * payload - pointer to the payload area allocated via - * xpc_initiate_allocate(). + * flags - see xp.h for valid flags. + * payload - pointer to the payload which is to be sent. + * payload_size - size of the payload in bytes. */ enum xp_retval -xpc_initiate_send(short partid, int ch_number, void *payload) +xpc_initiate_send(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size) { struct xpc_partition *part = &xpc_partitions[partid]; - struct xpc_msg *msg = XPC_MSG_ADDRESS(payload); - enum xp_retval ret; + enum xp_retval ret = xpUnknownReason; - dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *)msg, + dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload, partid, ch_number); - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); + DBUG_ON(partid < 0 || partid >= xp_max_npartitions); DBUG_ON(ch_number < 0 || ch_number >= part->nchannels); - DBUG_ON(msg == NULL); + DBUG_ON(payload == NULL); - ret = xpc_send_msg(&part->channels[ch_number], msg, 0, NULL, NULL); + if (xpc_part_ref(part)) { + ret = xpc_send_payload(&part->channels[ch_number], flags, + payload, payload_size, 0, NULL, NULL); + xpc_part_deref(part); + } return ret; } /* - * Send a message previously allocated using xpc_initiate_allocate on the - * specified channel connected to the specified partition. + * Send a message that contains the user's payload on the specified channel + * connected to the specified partition. * - * This routine will not wait for the message to be sent. Once this routine - * has returned the message entry allocated via xpc_initiate_allocate() is no - * longer accessable to the caller. + * NOTE that this routine can sleep waiting for a message entry to become + * available. To not sleep, pass in the XPC_NOWAIT flag. + * + * This routine will not wait for the message to be sent or received. * * Once the remote end of the channel has received the message, the function * passed as an argument to xpc_initiate_send_notify() will be called. This @@ -1943,158 +884,51 @@ xpc_initiate_send(short partid, int ch_number, void *payload) * * If this routine returns an error, the caller's function will NOT be called. * - * This routine, although called by users, does not call xpc_part_ref() to - * ensure that the partition infrastructure is in place. It relies on the - * fact that we called xpc_msgqueue_ref() in xpc_allocate_msg(). - * * Arguments: * * partid - ID of partition to which the channel is connected. * ch_number - channel # to send message on. - * payload - pointer to the payload area allocated via - * xpc_initiate_allocate(). + * flags - see xp.h for valid flags. + * payload - pointer to the payload which is to be sent. + * payload_size - size of the payload in bytes. * func - function to call with asynchronous notification of message * receipt. THIS FUNCTION MUST BE NON-BLOCKING. * key - user-defined key to be passed to the function when it's called. */ enum xp_retval -xpc_initiate_send_notify(short partid, int ch_number, void *payload, - xpc_notify_func func, void *key) +xpc_initiate_send_notify(short partid, int ch_number, u32 flags, void *payload, + u16 payload_size, xpc_notify_func func, void *key) { struct xpc_partition *part = &xpc_partitions[partid]; - struct xpc_msg *msg = XPC_MSG_ADDRESS(payload); - enum xp_retval ret; + enum xp_retval ret = xpUnknownReason; - dev_dbg(xpc_chan, "msg=0x%p, partid=%d, channel=%d\n", (void *)msg, + dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload, partid, ch_number); - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); + DBUG_ON(partid < 0 || partid >= xp_max_npartitions); DBUG_ON(ch_number < 0 || ch_number >= part->nchannels); - DBUG_ON(msg == NULL); + DBUG_ON(payload == NULL); DBUG_ON(func == NULL); - ret = xpc_send_msg(&part->channels[ch_number], msg, XPC_N_CALL, - func, key); - return ret; -} - -static struct xpc_msg * -xpc_pull_remote_msg(struct xpc_channel *ch, s64 get) -{ - struct xpc_partition *part = &xpc_partitions[ch->partid]; - struct xpc_msg *remote_msg, *msg; - u32 msg_index, nmsgs; - u64 msg_offset; - enum xp_retval ret; - - if (mutex_lock_interruptible(&ch->msg_to_pull_mutex) != 0) { - /* we were interrupted by a signal */ - return NULL; - } - - while (get >= ch->next_msg_to_pull) { - - /* pull as many messages as are ready and able to be pulled */ - - msg_index = ch->next_msg_to_pull % ch->remote_nentries; - - DBUG_ON(ch->next_msg_to_pull >= ch->w_remote_GP.put); - nmsgs = ch->w_remote_GP.put - ch->next_msg_to_pull; - if (msg_index + nmsgs > ch->remote_nentries) { - /* ignore the ones that wrap the msg queue for now */ - nmsgs = ch->remote_nentries - msg_index; - } - - msg_offset = msg_index * ch->msg_size; - msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset); - remote_msg = (struct xpc_msg *)(ch->remote_msgqueue_pa + - msg_offset); - - ret = xpc_pull_remote_cachelines(part, msg, remote_msg, - nmsgs * ch->msg_size); - if (ret != xpSuccess) { - - dev_dbg(xpc_chan, "failed to pull %d msgs starting with" - " msg %ld from partition %d, channel=%d, " - "ret=%d\n", nmsgs, ch->next_msg_to_pull, - ch->partid, ch->number, ret); - - XPC_DEACTIVATE_PARTITION(part, ret); - - mutex_unlock(&ch->msg_to_pull_mutex); - return NULL; - } - - ch->next_msg_to_pull += nmsgs; + if (xpc_part_ref(part)) { + ret = xpc_send_payload(&part->channels[ch_number], flags, + payload, payload_size, XPC_N_CALL, func, + key); + xpc_part_deref(part); } - - mutex_unlock(&ch->msg_to_pull_mutex); - - /* return the message we were looking for */ - msg_offset = (get % ch->remote_nentries) * ch->msg_size; - msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + msg_offset); - - return msg; -} - -/* - * Get a message to be delivered. - */ -static struct xpc_msg * -xpc_get_deliverable_msg(struct xpc_channel *ch) -{ - struct xpc_msg *msg = NULL; - s64 get; - - do { - if (ch->flags & XPC_C_DISCONNECTING) - break; - - get = ch->w_local_GP.get; - rmb(); /* guarantee that .get loads before .put */ - if (get == ch->w_remote_GP.put) - break; - - /* There are messages waiting to be pulled and delivered. - * We need to try to secure one for ourselves. We'll do this - * by trying to increment w_local_GP.get and hope that no one - * else beats us to it. If they do, we'll we'll simply have - * to try again for the next one. - */ - - if (cmpxchg(&ch->w_local_GP.get, get, get + 1) == get) { - /* we got the entry referenced by get */ - - dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, " - "partid=%d, channel=%d\n", get + 1, - ch->partid, ch->number); - - /* pull the message from the remote partition */ - - msg = xpc_pull_remote_msg(ch, get); - - DBUG_ON(msg != NULL && msg->number != get); - DBUG_ON(msg != NULL && (msg->flags & XPC_M_DONE)); - DBUG_ON(msg != NULL && !(msg->flags & XPC_M_READY)); - - break; - } - - } while (1); - - return msg; + return ret; } /* - * Deliver a message to its intended recipient. + * Deliver a message's payload to its intended recipient. */ void -xpc_deliver_msg(struct xpc_channel *ch) +xpc_deliver_payload(struct xpc_channel *ch) { - struct xpc_msg *msg; + void *payload; - msg = xpc_get_deliverable_msg(ch); - if (msg != NULL) { + payload = xpc_get_deliverable_payload(ch); + if (payload != NULL) { /* * This ref is taken to protect the payload itself from being @@ -2106,18 +940,16 @@ xpc_deliver_msg(struct xpc_channel *ch) atomic_inc(&ch->kthreads_active); if (ch->func != NULL) { - dev_dbg(xpc_chan, "ch->func() called, msg=0x%p, " - "msg_number=%ld, partid=%d, channel=%d\n", - (void *)msg, msg->number, ch->partid, + dev_dbg(xpc_chan, "ch->func() called, payload=0x%p " + "partid=%d channel=%d\n", payload, ch->partid, ch->number); /* deliver the message to its intended recipient */ - ch->func(xpMsgReceived, ch->partid, ch->number, - &msg->payload, ch->key); + ch->func(xpMsgReceived, ch->partid, ch->number, payload, + ch->key); - dev_dbg(xpc_chan, "ch->func() returned, msg=0x%p, " - "msg_number=%ld, partid=%d, channel=%d\n", - (void *)msg, msg->number, ch->partid, + dev_dbg(xpc_chan, "ch->func() returned, payload=0x%p " + "partid=%d channel=%d\n", payload, ch->partid, ch->number); } @@ -2126,118 +958,31 @@ xpc_deliver_msg(struct xpc_channel *ch) } /* - * Now we actually acknowledge the messages that have been delivered and ack'd - * by advancing the cached remote message queue's Get value and if requested - * send an IPI to the message sender's partition. - */ -static void -xpc_acknowledge_msgs(struct xpc_channel *ch, s64 initial_get, u8 msg_flags) -{ - struct xpc_msg *msg; - s64 get = initial_get + 1; - int send_IPI = 0; - - while (1) { - - while (1) { - if (get == ch->w_local_GP.get) - break; - - msg = (struct xpc_msg *)((u64)ch->remote_msgqueue + - (get % ch->remote_nentries) * - ch->msg_size); - - if (!(msg->flags & XPC_M_DONE)) - break; - - msg_flags |= msg->flags; - get++; - } - - if (get == initial_get) { - /* nothing's changed */ - break; - } - - if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) != - initial_get) { - /* someone else beat us to it */ - DBUG_ON(ch->local_GP->get <= initial_get); - break; - } - - /* we just set the new value of local_GP->get */ - - dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, " - "channel=%d\n", get, ch->partid, ch->number); - - send_IPI = (msg_flags & XPC_M_INTERRUPT); - - /* - * We need to ensure that the message referenced by - * local_GP->get is not XPC_M_DONE or that local_GP->get - * equals w_local_GP.get, so we'll go have a look. - */ - initial_get = get; - } - - if (send_IPI) - xpc_IPI_send_msgrequest(ch); -} - -/* - * Acknowledge receipt of a delivered message. - * - * If a message has XPC_M_INTERRUPT set, send an interrupt to the partition - * that sent the message. + * Acknowledge receipt of a delivered message's payload. * * This function, although called by users, does not call xpc_part_ref() to * ensure that the partition infrastructure is in place. It relies on the - * fact that we called xpc_msgqueue_ref() in xpc_deliver_msg(). + * fact that we called xpc_msgqueue_ref() in xpc_deliver_payload(). * * Arguments: * * partid - ID of partition to which the channel is connected. * ch_number - channel # message received on. * payload - pointer to the payload area allocated via - * xpc_initiate_allocate(). + * xpc_initiate_send() or xpc_initiate_send_notify(). */ void xpc_initiate_received(short partid, int ch_number, void *payload) { struct xpc_partition *part = &xpc_partitions[partid]; struct xpc_channel *ch; - struct xpc_msg *msg = XPC_MSG_ADDRESS(payload); - s64 get, msg_number = msg->number; - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); + DBUG_ON(partid < 0 || partid >= xp_max_npartitions); DBUG_ON(ch_number < 0 || ch_number >= part->nchannels); ch = &part->channels[ch_number]; + xpc_received_payload(ch, payload); - dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n", - (void *)msg, msg_number, ch->partid, ch->number); - - DBUG_ON((((u64)msg - (u64)ch->remote_msgqueue) / ch->msg_size) != - msg_number % ch->remote_nentries); - DBUG_ON(msg->flags & XPC_M_DONE); - - msg->flags |= XPC_M_DONE; - - /* - * The preceding store of msg->flags must occur before the following - * load of ch->local_GP->get. - */ - mb(); - - /* - * See if this message is next in line to be acknowledged as having - * been delivered. - */ - get = ch->local_GP->get; - if (get == msg_number) - xpc_acknowledge_msgs(ch, get, msg->flags); - - /* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg() */ + /* the call to xpc_msgqueue_ref() was done by xpc_deliver_payload() */ xpc_msgqueue_deref(ch); } diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c index c3b4227f48a..46325fc8481 100644 --- a/drivers/misc/sgi-xp/xpc_main.c +++ b/drivers/misc/sgi-xp/xpc_main.c @@ -25,37 +25,31 @@ * * Caveats: * - * . We currently have no way to determine which nasid an IPI came - * from. Thus, xpc_IPI_send() does a remote AMO write followed by - * an IPI. The AMO indicates where data is to be pulled from, so - * after the IPI arrives, the remote partition checks the AMO word. - * The IPI can actually arrive before the AMO however, so other code - * must periodically check for this case. Also, remote AMO operations - * do not reliably time out. Thus we do a remote PIO read solely to - * know whether the remote partition is down and whether we should - * stop sending IPIs to it. This remote PIO read operation is set up - * in a special nofault region so SAL knows to ignore (and cleanup) - * any errors due to the remote AMO write, PIO read, and/or PIO - * write operations. + * . Currently on sn2, we have no way to determine which nasid an IRQ + * came from. Thus, xpc_send_IRQ_sn2() does a remote amo write + * followed by an IPI. The amo indicates where data is to be pulled + * from, so after the IPI arrives, the remote partition checks the amo + * word. The IPI can actually arrive before the amo however, so other + * code must periodically check for this case. Also, remote amo + * operations do not reliably time out. Thus we do a remote PIO read + * solely to know whether the remote partition is down and whether we + * should stop sending IPIs to it. This remote PIO read operation is + * set up in a special nofault region so SAL knows to ignore (and + * cleanup) any errors due to the remote amo write, PIO read, and/or + * PIO write operations. * * If/when new hardware solves this IPI problem, we should abandon * the current approach. * */ -#include <linux/kernel.h> #include <linux/module.h> -#include <linux/init.h> -#include <linux/cache.h> -#include <linux/interrupt.h> +#include <linux/sysctl.h> +#include <linux/device.h> #include <linux/delay.h> #include <linux/reboot.h> -#include <linux/completion.h> #include <linux/kdebug.h> #include <linux/kthread.h> -#include <linux/uaccess.h> -#include <asm/sn/intr.h> -#include <asm/sn/sn_sal.h> #include "xpc.h" /* define two XPC debug device structures to be used with dev_dbg() et al */ @@ -89,9 +83,9 @@ static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL; static int xpc_hb_check_min_interval = 10; static int xpc_hb_check_max_interval = 120; -int xpc_disengage_request_timelimit = XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT; -static int xpc_disengage_request_min_timelimit; /* = 0 */ -static int xpc_disengage_request_max_timelimit = 120; +int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT; +static int xpc_disengage_min_timelimit; /* = 0 */ +static int xpc_disengage_max_timelimit = 120; static ctl_table xpc_sys_xpc_hb_dir[] = { { @@ -124,14 +118,14 @@ static ctl_table xpc_sys_xpc_dir[] = { .child = xpc_sys_xpc_hb_dir}, { .ctl_name = CTL_UNNUMBERED, - .procname = "disengage_request_timelimit", - .data = &xpc_disengage_request_timelimit, + .procname = "disengage_timelimit", + .data = &xpc_disengage_timelimit, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, - .extra1 = &xpc_disengage_request_min_timelimit, - .extra2 = &xpc_disengage_request_max_timelimit}, + .extra1 = &xpc_disengage_min_timelimit, + .extra2 = &xpc_disengage_max_timelimit}, {} }; static ctl_table xpc_sys_dir[] = { @@ -144,16 +138,19 @@ static ctl_table xpc_sys_dir[] = { }; static struct ctl_table_header *xpc_sysctl; -/* non-zero if any remote partition disengage request was timed out */ -int xpc_disengage_request_timedout; +/* non-zero if any remote partition disengage was timed out */ +int xpc_disengage_timedout; -/* #of IRQs received */ -static atomic_t xpc_act_IRQ_rcvd; +/* #of activate IRQs received and not yet processed */ +int xpc_activate_IRQ_rcvd; +DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock); /* IRQ handler notifies this wait queue on receipt of an IRQ */ -static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq); +DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq); static unsigned long xpc_hb_check_timeout; +static struct timer_list xpc_hb_timer; +void *xpc_heartbeating_to_mask; /* notification that the xpc_hb_checker thread has exited */ static DECLARE_COMPLETION(xpc_hb_checker_exited); @@ -161,8 +158,6 @@ static DECLARE_COMPLETION(xpc_hb_checker_exited); /* notification that the xpc_discovery thread has exited */ static DECLARE_COMPLETION(xpc_discovery_exited); -static struct timer_list xpc_hb_timer; - static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *); static int xpc_system_reboot(struct notifier_block *, unsigned long, void *); @@ -175,31 +170,76 @@ static struct notifier_block xpc_die_notifier = { .notifier_call = xpc_system_die, }; +int (*xpc_setup_partitions_sn) (void); +enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *buf, u64 *cookie, + unsigned long *rp_pa, + size_t *len); +int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *rp); +void (*xpc_heartbeat_init) (void); +void (*xpc_heartbeat_exit) (void); +void (*xpc_increment_heartbeat) (void); +void (*xpc_offline_heartbeat) (void); +void (*xpc_online_heartbeat) (void); +enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *part); + +enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part); +void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch); +u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part); +enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *ch); +void (*xpc_teardown_msg_structures) (struct xpc_channel *ch); +void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number); +int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *ch); +void *(*xpc_get_deliverable_payload) (struct xpc_channel *ch); + +void (*xpc_request_partition_activation) (struct xpc_rsvd_page *remote_rp, + unsigned long remote_rp_pa, + int nasid); +void (*xpc_request_partition_reactivation) (struct xpc_partition *part); +void (*xpc_request_partition_deactivation) (struct xpc_partition *part); +void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part); + +void (*xpc_process_activate_IRQ_rcvd) (void); +enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *part); +void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *part); + +void (*xpc_indicate_partition_engaged) (struct xpc_partition *part); +int (*xpc_partition_engaged) (short partid); +int (*xpc_any_partition_engaged) (void); +void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part); +void (*xpc_assume_partition_disengaged) (short partid); + +void (*xpc_send_chctl_closerequest) (struct xpc_channel *ch, + unsigned long *irq_flags); +void (*xpc_send_chctl_closereply) (struct xpc_channel *ch, + unsigned long *irq_flags); +void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch, + unsigned long *irq_flags); +void (*xpc_send_chctl_openreply) (struct xpc_channel *ch, + unsigned long *irq_flags); + +void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch, + unsigned long msgqueue_pa); + +enum xp_retval (*xpc_send_payload) (struct xpc_channel *ch, u32 flags, + void *payload, u16 payload_size, + u8 notify_type, xpc_notify_func func, + void *key); +void (*xpc_received_payload) (struct xpc_channel *ch, void *payload); + /* - * Timer function to enforce the timelimit on the partition disengage request. + * Timer function to enforce the timelimit on the partition disengage. */ static void -xpc_timeout_partition_disengage_request(unsigned long data) +xpc_timeout_partition_disengage(unsigned long data) { struct xpc_partition *part = (struct xpc_partition *)data; - DBUG_ON(time_before(jiffies, part->disengage_request_timeout)); + DBUG_ON(time_is_after_jiffies(part->disengage_timeout)); (void)xpc_partition_disengaged(part); - DBUG_ON(part->disengage_request_timeout != 0); - DBUG_ON(xpc_partition_engaged(1UL << XPC_PARTID(part)) != 0); -} - -/* - * Notify the heartbeat check thread that an IRQ has been received. - */ -static irqreturn_t -xpc_act_IRQ_handler(int irq, void *dev_id) -{ - atomic_inc(&xpc_act_IRQ_rcvd); - wake_up_interruptible(&xpc_act_IRQ_wq); - return IRQ_HANDLED; + DBUG_ON(part->disengage_timeout != 0); + DBUG_ON(xpc_partition_engaged(XPC_PARTID(part))); } /* @@ -210,15 +250,63 @@ xpc_act_IRQ_handler(int irq, void *dev_id) static void xpc_hb_beater(unsigned long dummy) { - xpc_vars->heartbeat++; + xpc_increment_heartbeat(); - if (time_after_eq(jiffies, xpc_hb_check_timeout)) - wake_up_interruptible(&xpc_act_IRQ_wq); + if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) + wake_up_interruptible(&xpc_activate_IRQ_wq); xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ); add_timer(&xpc_hb_timer); } +static void +xpc_start_hb_beater(void) +{ + xpc_heartbeat_init(); + init_timer(&xpc_hb_timer); + xpc_hb_timer.function = xpc_hb_beater; + xpc_hb_beater(0); +} + +static void +xpc_stop_hb_beater(void) +{ + del_timer_sync(&xpc_hb_timer); + xpc_heartbeat_exit(); +} + +/* + * At periodic intervals, scan through all active partitions and ensure + * their heartbeat is still active. If not, the partition is deactivated. + */ +static void +xpc_check_remote_hb(void) +{ + struct xpc_partition *part; + short partid; + enum xp_retval ret; + + for (partid = 0; partid < xp_max_npartitions; partid++) { + + if (xpc_exiting) + break; + + if (partid == xp_partition_id) + continue; + + part = &xpc_partitions[partid]; + + if (part->act_state == XPC_P_AS_INACTIVE || + part->act_state == XPC_P_AS_DEACTIVATING) { + continue; + } + + ret = xpc_get_remote_heartbeat(part); + if (ret != xpSuccess) + XPC_DEACTIVATE_PARTITION(part, ret); + } +} + /* * This thread is responsible for nearly all of the partition * activation/deactivation. @@ -226,8 +314,6 @@ xpc_hb_beater(unsigned long dummy) static int xpc_hb_checker(void *ignore) { - int last_IRQ_count = 0; - int new_IRQ_count; int force_IRQ = 0; /* this thread was marked active by xpc_hb_init() */ @@ -236,56 +322,49 @@ xpc_hb_checker(void *ignore) /* set our heartbeating to other partitions into motion */ xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ); - xpc_hb_beater(0); + xpc_start_hb_beater(); while (!xpc_exiting) { dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have " "been received\n", (int)(xpc_hb_check_timeout - jiffies), - atomic_read(&xpc_act_IRQ_rcvd) - last_IRQ_count); + xpc_activate_IRQ_rcvd); /* checking of remote heartbeats is skewed by IRQ handling */ - if (time_after_eq(jiffies, xpc_hb_check_timeout)) { + if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) { + xpc_hb_check_timeout = jiffies + + (xpc_hb_check_interval * HZ); + dev_dbg(xpc_part, "checking remote heartbeats\n"); xpc_check_remote_hb(); /* - * We need to periodically recheck to ensure no - * IPI/AMO pairs have been missed. That check - * must always reset xpc_hb_check_timeout. + * On sn2 we need to periodically recheck to ensure no + * IRQ/amo pairs have been missed. */ - force_IRQ = 1; + if (is_shub()) + force_IRQ = 1; } /* check for outstanding IRQs */ - new_IRQ_count = atomic_read(&xpc_act_IRQ_rcvd); - if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) { + if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) { force_IRQ = 0; - - dev_dbg(xpc_part, "found an IRQ to process; will be " - "resetting xpc_hb_check_timeout\n"); - - last_IRQ_count += xpc_identify_act_IRQ_sender(); - if (last_IRQ_count < new_IRQ_count) { - /* retry once to help avoid missing AMO */ - (void)xpc_identify_act_IRQ_sender(); - } - last_IRQ_count = new_IRQ_count; - - xpc_hb_check_timeout = jiffies + - (xpc_hb_check_interval * HZ); + dev_dbg(xpc_part, "processing activate IRQs " + "received\n"); + xpc_process_activate_IRQ_rcvd(); } /* wait for IRQ or timeout */ - (void)wait_event_interruptible(xpc_act_IRQ_wq, - (last_IRQ_count < - atomic_read(&xpc_act_IRQ_rcvd) - || time_after_eq(jiffies, - xpc_hb_check_timeout) || + (void)wait_event_interruptible(xpc_activate_IRQ_wq, + (time_is_before_eq_jiffies( + xpc_hb_check_timeout) || + xpc_activate_IRQ_rcvd > 0 || xpc_exiting)); } + xpc_stop_hb_beater(); + dev_dbg(xpc_part, "heartbeat checker is exiting\n"); /* mark this thread as having exited */ @@ -311,37 +390,8 @@ xpc_initiate_discovery(void *ignore) } /* - * Establish first contact with the remote partititon. This involves pulling - * the XPC per partition variables from the remote partition and waiting for - * the remote partition to pull ours. - */ -static enum xp_retval -xpc_make_first_contact(struct xpc_partition *part) -{ - enum xp_retval ret; - - while ((ret = xpc_pull_remote_vars_part(part)) != xpSuccess) { - if (ret != xpRetry) { - XPC_DEACTIVATE_PARTITION(part, ret); - return ret; - } - - dev_dbg(xpc_chan, "waiting to make first contact with " - "partition %d\n", XPC_PARTID(part)); - - /* wait a 1/4 of a second or so */ - (void)msleep_interruptible(250); - - if (part->act_state == XPC_P_DEACTIVATING) - return part->reason; - } - - return xpc_mark_partition_active(part); -} - -/* * The first kthread assigned to a newly activated partition is the one - * created by XPC HB with which it calls xpc_partition_up(). XPC hangs on to + * created by XPC HB with which it calls xpc_activating(). XPC hangs on to * that kthread until the partition is brought down, at which time that kthread * returns back to XPC HB. (The return of that kthread will signify to XPC HB * that XPC has dismantled all communication infrastructure for the associated @@ -354,11 +404,11 @@ xpc_make_first_contact(struct xpc_partition *part) static void xpc_channel_mgr(struct xpc_partition *part) { - while (part->act_state != XPC_P_DEACTIVATING || + while (part->act_state != XPC_P_AS_DEACTIVATING || atomic_read(&part->nchannels_active) > 0 || !xpc_partition_disengaged(part)) { - xpc_process_channel_activity(part); + xpc_process_sent_chctl_flags(part); /* * Wait until we've been requested to activate kthreads or @@ -376,8 +426,8 @@ xpc_channel_mgr(struct xpc_partition *part) atomic_dec(&part->channel_mgr_requests); (void)wait_event_interruptible(part->channel_mgr_wq, (atomic_read(&part->channel_mgr_requests) > 0 || - part->local_IPI_amo != 0 || - (part->act_state == XPC_P_DEACTIVATING && + part->chctl.all_flags != 0 || + (part->act_state == XPC_P_AS_DEACTIVATING && atomic_read(&part->nchannels_active) == 0 && xpc_partition_disengaged(part)))); atomic_set(&part->channel_mgr_requests, 1); @@ -385,47 +435,163 @@ xpc_channel_mgr(struct xpc_partition *part) } /* - * When XPC HB determines that a partition has come up, it will create a new - * kthread and that kthread will call this function to attempt to set up the - * basic infrastructure used for Cross Partition Communication with the newly - * upped partition. - * - * The kthread that was created by XPC HB and which setup the XPC - * infrastructure will remain assigned to the partition until the partition - * goes down. At which time the kthread will teardown the XPC infrastructure - * and then exit. - * - * XPC HB will put the remote partition's XPC per partition specific variables - * physical address into xpc_partitions[partid].remote_vars_part_pa prior to - * calling xpc_partition_up(). + * Guarantee that the kzalloc'd memory is cacheline aligned. */ -static void -xpc_partition_up(struct xpc_partition *part) +void * +xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) +{ + /* see if kzalloc will give us cachline aligned memory by default */ + *base = kzalloc(size, flags); + if (*base == NULL) + return NULL; + + if ((u64)*base == L1_CACHE_ALIGN((u64)*base)) + return *base; + + kfree(*base); + + /* nope, we'll have to do it ourselves */ + *base = kzalloc(size + L1_CACHE_BYTES, flags); + if (*base == NULL) + return NULL; + + return (void *)L1_CACHE_ALIGN((u64)*base); +} + +/* + * Setup the channel structures necessary to support XPartition Communication + * between the specified remote partition and the local one. + */ +static enum xp_retval +xpc_setup_ch_structures(struct xpc_partition *part) { + enum xp_retval ret; + int ch_number; + struct xpc_channel *ch; + short partid = XPC_PARTID(part); + + /* + * Allocate all of the channel structures as a contiguous chunk of + * memory. + */ DBUG_ON(part->channels != NULL); + part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS, + GFP_KERNEL); + if (part->channels == NULL) { + dev_err(xpc_chan, "can't get memory for channels\n"); + return xpNoMemory; + } - dev_dbg(xpc_chan, "activating partition %d\n", XPC_PARTID(part)); + /* allocate the remote open and close args */ - if (xpc_setup_infrastructure(part) != xpSuccess) - return; + part->remote_openclose_args = + xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, + GFP_KERNEL, &part-> + remote_openclose_args_base); + if (part->remote_openclose_args == NULL) { + dev_err(xpc_chan, "can't get memory for remote connect args\n"); + ret = xpNoMemory; + goto out_1; + } + + part->chctl.all_flags = 0; + spin_lock_init(&part->chctl_lock); + + atomic_set(&part->channel_mgr_requests, 1); + init_waitqueue_head(&part->channel_mgr_wq); + + part->nchannels = XPC_MAX_NCHANNELS; + + atomic_set(&part->nchannels_active, 0); + atomic_set(&part->nchannels_engaged, 0); + + for (ch_number = 0; ch_number < part->nchannels; ch_number++) { + ch = &part->channels[ch_number]; + + ch->partid = partid; + ch->number = ch_number; + ch->flags = XPC_C_DISCONNECTED; + + atomic_set(&ch->kthreads_assigned, 0); + atomic_set(&ch->kthreads_idle, 0); + atomic_set(&ch->kthreads_active, 0); + + atomic_set(&ch->references, 0); + atomic_set(&ch->n_to_notify, 0); + + spin_lock_init(&ch->lock); + init_completion(&ch->wdisconnect_wait); + + atomic_set(&ch->n_on_msg_allocate_wq, 0); + init_waitqueue_head(&ch->msg_allocate_wq); + init_waitqueue_head(&ch->idle_wq); + } + + ret = xpc_setup_ch_structures_sn(part); + if (ret != xpSuccess) + goto out_2; + + /* + * With the setting of the partition setup_state to XPC_P_SS_SETUP, + * we're declaring that this partition is ready to go. + */ + part->setup_state = XPC_P_SS_SETUP; + + return xpSuccess; + + /* setup of ch structures failed */ +out_2: + kfree(part->remote_openclose_args_base); + part->remote_openclose_args = NULL; +out_1: + kfree(part->channels); + part->channels = NULL; + return ret; +} + +/* + * Teardown the channel structures necessary to support XPartition Communication + * between the specified remote partition and the local one. + */ +static void +xpc_teardown_ch_structures(struct xpc_partition *part) +{ + DBUG_ON(atomic_read(&part->nchannels_engaged) != 0); + DBUG_ON(atomic_read(&part->nchannels_active) != 0); /* - * The kthread that XPC HB called us with will become the - * channel manager for this partition. It will not return - * back to XPC HB until the partition's XPC infrastructure - * has been dismantled. + * Make this partition inaccessible to local processes by marking it + * as no longer setup. Then wait before proceeding with the teardown + * until all existing references cease. */ + DBUG_ON(part->setup_state != XPC_P_SS_SETUP); + part->setup_state = XPC_P_SS_WTEARDOWN; - (void)xpc_part_ref(part); /* this will always succeed */ + wait_event(part->teardown_wq, (atomic_read(&part->references) == 0)); - if (xpc_make_first_contact(part) == xpSuccess) - xpc_channel_mgr(part); + /* now we can begin tearing down the infrastructure */ - xpc_part_deref(part); + xpc_teardown_ch_structures_sn(part); - xpc_teardown_infrastructure(part); + kfree(part->remote_openclose_args_base); + part->remote_openclose_args = NULL; + kfree(part->channels); + part->channels = NULL; + + part->setup_state = XPC_P_SS_TORNDOWN; } +/* + * When XPC HB determines that a partition has come up, it will create a new + * kthread and that kthread will call this function to attempt to set up the + * basic infrastructure used for Cross Partition Communication with the newly + * upped partition. + * + * The kthread that was created by XPC HB and which setup the XPC + * infrastructure will remain assigned to the partition becoming the channel + * manager for that partition until the partition is deactivating, at which + * time the kthread will teardown the XPC infrastructure and then exit. + */ static int xpc_activating(void *__partid) { @@ -433,64 +599,47 @@ xpc_activating(void *__partid) struct xpc_partition *part = &xpc_partitions[partid]; unsigned long irq_flags; - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); + DBUG_ON(partid < 0 || partid >= xp_max_npartitions); spin_lock_irqsave(&part->act_lock, irq_flags); - if (part->act_state == XPC_P_DEACTIVATING) { - part->act_state = XPC_P_INACTIVE; + if (part->act_state == XPC_P_AS_DEACTIVATING) { + part->act_state = XPC_P_AS_INACTIVE; spin_unlock_irqrestore(&part->act_lock, irq_flags); part->remote_rp_pa = 0; return 0; } /* indicate the thread is activating */ - DBUG_ON(part->act_state != XPC_P_ACTIVATION_REQ); - part->act_state = XPC_P_ACTIVATING; + DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ); + part->act_state = XPC_P_AS_ACTIVATING; XPC_SET_REASON(part, 0, 0); spin_unlock_irqrestore(&part->act_lock, irq_flags); - dev_dbg(xpc_part, "bringing partition %d up\n", partid); + dev_dbg(xpc_part, "activating partition %d\n", partid); - /* - * Register the remote partition's AMOs with SAL so it can handle - * and cleanup errors within that address range should the remote - * partition go down. We don't unregister this range because it is - * difficult to tell when outstanding writes to the remote partition - * are finished and thus when it is safe to unregister. This should - * not result in wasted space in the SAL xp_addr_region table because - * we should get the same page for remote_amos_page_pa after module - * reloads and system reboots. - */ - if (sn_register_xp_addr_region(part->remote_amos_page_pa, - PAGE_SIZE, 1) < 0) { - dev_warn(xpc_part, "xpc_partition_up(%d) failed to register " - "xp_addr region\n", partid); + xpc_allow_hb(partid); - spin_lock_irqsave(&part->act_lock, irq_flags); - part->act_state = XPC_P_INACTIVE; - XPC_SET_REASON(part, xpPhysAddrRegFailed, __LINE__); - spin_unlock_irqrestore(&part->act_lock, irq_flags); - part->remote_rp_pa = 0; - return 0; - } + if (xpc_setup_ch_structures(part) == xpSuccess) { + (void)xpc_part_ref(part); /* this will always succeed */ - xpc_allow_hb(partid, xpc_vars); - xpc_IPI_send_activated(part); + if (xpc_make_first_contact(part) == xpSuccess) { + xpc_mark_partition_active(part); + xpc_channel_mgr(part); + /* won't return until partition is deactivating */ + } - /* - * xpc_partition_up() holds this thread and marks this partition as - * XPC_P_ACTIVE by calling xpc_hb_mark_active(). - */ - (void)xpc_partition_up(part); + xpc_part_deref(part); + xpc_teardown_ch_structures(part); + } - xpc_disallow_hb(partid, xpc_vars); + xpc_disallow_hb(partid); xpc_mark_partition_inactive(part); if (part->reason == xpReactivating) { /* interrupting ourselves results in activating partition */ - xpc_IPI_send_reactivate(part); + xpc_request_partition_reactivation(part); } return 0; @@ -505,9 +654,9 @@ xpc_activate_partition(struct xpc_partition *part) spin_lock_irqsave(&part->act_lock, irq_flags); - DBUG_ON(part->act_state != XPC_P_INACTIVE); + DBUG_ON(part->act_state != XPC_P_AS_INACTIVE); - part->act_state = XPC_P_ACTIVATION_REQ; + part->act_state = XPC_P_AS_ACTIVATION_REQ; XPC_SET_REASON(part, xpCloneKThread, __LINE__); spin_unlock_irqrestore(&part->act_lock, irq_flags); @@ -516,62 +665,12 @@ xpc_activate_partition(struct xpc_partition *part) partid); if (IS_ERR(kthread)) { spin_lock_irqsave(&part->act_lock, irq_flags); - part->act_state = XPC_P_INACTIVE; + part->act_state = XPC_P_AS_INACTIVE; XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__); spin_unlock_irqrestore(&part->act_lock, irq_flags); } } -/* - * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified - * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more - * than one partition, we use an AMO_t structure per partition to indicate - * whether a partition has sent an IPI or not. If it has, then wake up the - * associated kthread to handle it. - * - * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IPIs sent by XPC - * running on other partitions. - * - * Noteworthy Arguments: - * - * irq - Interrupt ReQuest number. NOT USED. - * - * dev_id - partid of IPI's potential sender. - */ -irqreturn_t -xpc_notify_IRQ_handler(int irq, void *dev_id) -{ - short partid = (short)(u64)dev_id; - struct xpc_partition *part = &xpc_partitions[partid]; - - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); - - if (xpc_part_ref(part)) { - xpc_check_for_channel_activity(part); - - xpc_part_deref(part); - } - return IRQ_HANDLED; -} - -/* - * Check to see if xpc_notify_IRQ_handler() dropped any IPIs on the floor - * because the write to their associated IPI amo completed after the IRQ/IPI - * was received. - */ -void -xpc_dropped_IPI_check(struct xpc_partition *part) -{ - if (xpc_part_ref(part)) { - xpc_check_for_channel_activity(part); - - part->dropped_IPI_timer.expires = jiffies + - XPC_P_DROPPED_IPI_WAIT; - add_timer(&part->dropped_IPI_timer); - xpc_part_deref(part); - } -} - void xpc_activate_kthreads(struct xpc_channel *ch, int needed) { @@ -616,9 +715,9 @@ xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) do { /* deliver messages to their intended recipients */ - while (ch->w_local_GP.get < ch->w_remote_GP.put && + while (xpc_n_of_deliverable_payloads(ch) > 0 && !(ch->flags & XPC_C_DISCONNECTING)) { - xpc_deliver_msg(ch); + xpc_deliver_payload(ch); } if (atomic_inc_return(&ch->kthreads_idle) > @@ -632,7 +731,7 @@ xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch) "wait_event_interruptible_exclusive()\n"); (void)wait_event_interruptible_exclusive(ch->idle_wq, - (ch->w_local_GP.get < ch->w_remote_GP.put || + (xpc_n_of_deliverable_payloads(ch) > 0 || (ch->flags & XPC_C_DISCONNECTING))); atomic_dec(&ch->kthreads_idle); @@ -677,7 +776,7 @@ xpc_kthread_start(void *args) * additional kthreads to help deliver them. We only * need one less than total #of messages to deliver. */ - n_needed = ch->w_remote_GP.put - ch->w_local_GP.get - 1; + n_needed = xpc_n_of_deliverable_payloads(ch) - 1; if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING)) xpc_activate_kthreads(ch, n_needed); @@ -703,11 +802,9 @@ xpc_kthread_start(void *args) } spin_unlock_irqrestore(&ch->lock, irq_flags); - if (atomic_dec_return(&ch->kthreads_assigned) == 0) { - if (atomic_dec_return(&part->nchannels_engaged) == 0) { - xpc_mark_partition_disengaged(part); - xpc_IPI_send_disengage(part); - } + if (atomic_dec_return(&ch->kthreads_assigned) == 0 && + atomic_dec_return(&part->nchannels_engaged) == 0) { + xpc_indicate_partition_disengaged(part); } xpc_msgqueue_deref(ch); @@ -758,9 +855,9 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed, } else if (ch->flags & XPC_C_DISCONNECTING) { break; - } else if (atomic_inc_return(&ch->kthreads_assigned) == 1) { - if (atomic_inc_return(&part->nchannels_engaged) == 1) - xpc_mark_partition_engaged(part); + } else if (atomic_inc_return(&ch->kthreads_assigned) == 1 && + atomic_inc_return(&part->nchannels_engaged) == 1) { + xpc_indicate_partition_engaged(part); } (void)xpc_part_ref(part); xpc_msgqueue_ref(ch); @@ -782,8 +879,7 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed, if (atomic_dec_return(&ch->kthreads_assigned) == 0 && atomic_dec_return(&part->nchannels_engaged) == 0) { - xpc_mark_partition_disengaged(part); - xpc_IPI_send_disengage(part); + xpc_indicate_partition_disengaged(part); } xpc_msgqueue_deref(ch); xpc_part_deref(part); @@ -815,7 +911,7 @@ xpc_disconnect_wait(int ch_number) int wakeup_channel_mgr; /* now wait for all callouts to the caller's function to cease */ - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { + for (partid = 0; partid < xp_max_npartitions; partid++) { part = &xpc_partitions[partid]; if (!xpc_part_ref(part)) @@ -834,16 +930,15 @@ xpc_disconnect_wait(int ch_number) DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED)); wakeup_channel_mgr = 0; - if (ch->delayed_IPI_flags) { - if (part->act_state != XPC_P_DEACTIVATING) { - spin_lock(&part->IPI_lock); - XPC_SET_IPI_FLAGS(part->local_IPI_amo, - ch->number, - ch->delayed_IPI_flags); - spin_unlock(&part->IPI_lock); + if (ch->delayed_chctl_flags) { + if (part->act_state != XPC_P_AS_DEACTIVATING) { + spin_lock(&part->chctl_lock); + part->chctl.flags[ch->number] |= + ch->delayed_chctl_flags; + spin_unlock(&part->chctl_lock); wakeup_channel_mgr = 1; } - ch->delayed_IPI_flags = 0; + ch->delayed_chctl_flags = 0; } ch->flags &= ~XPC_C_WDISCONNECT; @@ -856,13 +951,63 @@ xpc_disconnect_wait(int ch_number) } } +static int +xpc_setup_partitions(void) +{ + short partid; + struct xpc_partition *part; + + xpc_partitions = kzalloc(sizeof(struct xpc_partition) * + xp_max_npartitions, GFP_KERNEL); + if (xpc_partitions == NULL) { + dev_err(xpc_part, "can't get memory for partition structure\n"); + return -ENOMEM; + } + + /* + * The first few fields of each entry of xpc_partitions[] need to + * be initialized now so that calls to xpc_connect() and + * xpc_disconnect() can be made prior to the activation of any remote + * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE + * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING + * PARTITION HAS BEEN ACTIVATED. + */ + for (partid = 0; partid < xp_max_npartitions; partid++) { + part = &xpc_partitions[partid]; + + DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); + + part->activate_IRQ_rcvd = 0; + spin_lock_init(&part->act_lock); + part->act_state = XPC_P_AS_INACTIVE; + XPC_SET_REASON(part, 0, 0); + + init_timer(&part->disengage_timer); + part->disengage_timer.function = + xpc_timeout_partition_disengage; + part->disengage_timer.data = (unsigned long)part; + + part->setup_state = XPC_P_SS_UNSET; + init_waitqueue_head(&part->teardown_wq); + atomic_set(&part->references, 0); + } + + return xpc_setup_partitions_sn(); +} + +static void +xpc_teardown_partitions(void) +{ + kfree(xpc_partitions); +} + static void xpc_do_exit(enum xp_retval reason) { short partid; int active_part_count, printed_waiting_msg = 0; struct xpc_partition *part; - unsigned long printmsg_time, disengage_request_timeout = 0; + unsigned long printmsg_time, disengage_timeout = 0; /* a 'rmmod XPC' and a 'reboot' cannot both end up here together */ DBUG_ON(xpc_exiting == 1); @@ -873,10 +1018,7 @@ xpc_do_exit(enum xp_retval reason) * the heartbeat checker thread in case it's sleeping. */ xpc_exiting = 1; - wake_up_interruptible(&xpc_act_IRQ_wq); - - /* ignore all incoming interrupts */ - free_irq(SGI_XPC_ACTIVATE, NULL); + wake_up_interruptible(&xpc_activate_IRQ_wq); /* wait for the discovery thread to exit */ wait_for_completion(&xpc_discovery_exited); @@ -889,17 +1031,17 @@ xpc_do_exit(enum xp_retval reason) /* wait for all partitions to become inactive */ - printmsg_time = jiffies + (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ); - xpc_disengage_request_timedout = 0; + printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); + xpc_disengage_timedout = 0; do { active_part_count = 0; - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { + for (partid = 0; partid < xp_max_npartitions; partid++) { part = &xpc_partitions[partid]; if (xpc_partition_disengaged(part) && - part->act_state == XPC_P_INACTIVE) { + part->act_state == XPC_P_AS_INACTIVE) { continue; } @@ -907,36 +1049,32 @@ xpc_do_exit(enum xp_retval reason) XPC_DEACTIVATE_PARTITION(part, reason); - if (part->disengage_request_timeout > - disengage_request_timeout) { - disengage_request_timeout = - part->disengage_request_timeout; - } + if (part->disengage_timeout > disengage_timeout) + disengage_timeout = part->disengage_timeout; } - if (xpc_partition_engaged(-1UL)) { - if (time_after(jiffies, printmsg_time)) { + if (xpc_any_partition_engaged()) { + if (time_is_before_jiffies(printmsg_time)) { dev_info(xpc_part, "waiting for remote " - "partitions to disengage, timeout in " - "%ld seconds\n", - (disengage_request_timeout - jiffies) - / HZ); + "partitions to deactivate, timeout in " + "%ld seconds\n", (disengage_timeout - + jiffies) / HZ); printmsg_time = jiffies + - (XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ); + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ); printed_waiting_msg = 1; } } else if (active_part_count > 0) { if (printed_waiting_msg) { dev_info(xpc_part, "waiting for local partition" - " to disengage\n"); + " to deactivate\n"); printed_waiting_msg = 0; } } else { - if (!xpc_disengage_request_timedout) { + if (!xpc_disengage_timedout) { dev_info(xpc_part, "all partitions have " - "disengaged\n"); + "deactivated\n"); } break; } @@ -946,33 +1084,28 @@ xpc_do_exit(enum xp_retval reason) } while (1); - DBUG_ON(xpc_partition_engaged(-1UL)); + DBUG_ON(xpc_any_partition_engaged()); + DBUG_ON(xpc_any_hbs_allowed() != 0); - /* indicate to others that our reserved page is uninitialized */ - xpc_rsvd_page->vars_pa = 0; - - /* now it's time to eliminate our heartbeat */ - del_timer_sync(&xpc_hb_timer); - DBUG_ON(xpc_vars->heartbeating_to_mask != 0); + xpc_teardown_rsvd_page(); if (reason == xpUnloading) { - /* take ourselves off of the reboot_notifier_list */ - (void)unregister_reboot_notifier(&xpc_reboot_notifier); - - /* take ourselves off of the die_notifier list */ (void)unregister_die_notifier(&xpc_die_notifier); + (void)unregister_reboot_notifier(&xpc_reboot_notifier); } - /* close down protections for IPI operations */ - xpc_restrict_IPI_ops(); - /* clear the interface to XPC's functions */ xpc_clear_interface(); if (xpc_sysctl) unregister_sysctl_table(xpc_sysctl); - kfree(xpc_remote_copy_buffer_base); + xpc_teardown_partitions(); + + if (is_shub()) + xpc_exit_sn2(); + else + xpc_exit_uv(); } /* @@ -1002,60 +1135,57 @@ xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused) } /* - * Notify other partitions to disengage from all references to our memory. + * Notify other partitions to deactivate from us by first disengaging from all + * references to our memory. */ static void -xpc_die_disengage(void) +xpc_die_deactivate(void) { struct xpc_partition *part; short partid; - unsigned long engaged; - long time, printmsg_time, disengage_request_timeout; + int any_engaged; + long keep_waiting; + long wait_to_print; /* keep xpc_hb_checker thread from doing anything (just in case) */ xpc_exiting = 1; - xpc_vars->heartbeating_to_mask = 0; /* indicate we're deactivated */ + xpc_disallow_all_hbs(); /*indicate we're deactivated */ - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { + for (partid = 0; partid < xp_max_npartitions; partid++) { part = &xpc_partitions[partid]; - if (!XPC_SUPPORTS_DISENGAGE_REQUEST(part-> - remote_vars_version)) { - - /* just in case it was left set by an earlier XPC */ - xpc_clear_partition_engaged(1UL << partid); - continue; - } - - if (xpc_partition_engaged(1UL << partid) || - part->act_state != XPC_P_INACTIVE) { - xpc_request_partition_disengage(part); - xpc_mark_partition_disengaged(part); - xpc_IPI_send_disengage(part); + if (xpc_partition_engaged(partid) || + part->act_state != XPC_P_AS_INACTIVE) { + xpc_request_partition_deactivation(part); + xpc_indicate_partition_disengaged(part); } } - time = rtc_time(); - printmsg_time = time + - (XPC_DISENGAGE_PRINTMSG_INTERVAL * sn_rtc_cycles_per_second); - disengage_request_timeout = time + - (xpc_disengage_request_timelimit * sn_rtc_cycles_per_second); - - /* wait for all other partitions to disengage from us */ + /* + * Though we requested that all other partitions deactivate from us, + * we only wait until they've all disengaged or we've reached the + * defined timelimit. + * + * Given that one iteration through the following while-loop takes + * approximately 200 microseconds, calculate the #of loops to take + * before bailing and the #of loops before printing a waiting message. + */ + keep_waiting = xpc_disengage_timelimit * 1000 * 5; + wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5; while (1) { - engaged = xpc_partition_engaged(-1UL); - if (!engaged) { - dev_info(xpc_part, "all partitions have disengaged\n"); + any_engaged = xpc_any_partition_engaged(); + if (!any_engaged) { + dev_info(xpc_part, "all partitions have deactivated\n"); break; } - time = rtc_time(); - if (time >= disengage_request_timeout) { - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { - if (engaged & (1UL << partid)) { - dev_info(xpc_part, "disengage from " + if (!keep_waiting--) { + for (partid = 0; partid < xp_max_npartitions; + partid++) { + if (xpc_partition_engaged(partid)) { + dev_info(xpc_part, "deactivate from " "remote partition %d timed " "out\n", partid); } @@ -1063,15 +1193,15 @@ xpc_die_disengage(void) break; } - if (time >= printmsg_time) { + if (!wait_to_print--) { dev_info(xpc_part, "waiting for remote partitions to " - "disengage, timeout in %ld seconds\n", - (disengage_request_timeout - time) / - sn_rtc_cycles_per_second); - printmsg_time = time + - (XPC_DISENGAGE_PRINTMSG_INTERVAL * - sn_rtc_cycles_per_second); + "deactivate, timeout in %ld seconds\n", + keep_waiting / (1000 * 5)); + wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * + 1000 * 5; } + + udelay(200); } } @@ -1086,10 +1216,11 @@ xpc_die_disengage(void) static int xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) { +#ifdef CONFIG_IA64 /* !!! temporary kludge */ switch (event) { case DIE_MACHINE_RESTART: case DIE_MACHINE_HALT: - xpc_die_disengage(); + xpc_die_deactivate(); break; case DIE_KDEBUG_ENTER: @@ -1100,8 +1231,7 @@ xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) /* fall through */ case DIE_MCA_MONARCH_ENTER: case DIE_INIT_MONARCH_ENTER: - xpc_vars->heartbeat++; - xpc_vars->heartbeat_offline = 1; + xpc_offline_heartbeat(); break; case DIE_KDEBUG_LEAVE: @@ -1112,10 +1242,12 @@ xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused) /* fall through */ case DIE_MCA_MONARCH_LEAVE: case DIE_INIT_MONARCH_LEAVE: - xpc_vars->heartbeat++; - xpc_vars->heartbeat_offline = 0; + xpc_online_heartbeat(); break; } +#else + xpc_die_deactivate(); +#endif return NOTIFY_DONE; } @@ -1124,105 +1256,52 @@ int __init xpc_init(void) { int ret; - short partid; - struct xpc_partition *part; struct task_struct *kthread; - size_t buf_size; - - if (!ia64_platform_is("sn2")) - return -ENODEV; - - buf_size = max(XPC_RP_VARS_SIZE, - XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES); - xpc_remote_copy_buffer = xpc_kmalloc_cacheline_aligned(buf_size, - GFP_KERNEL, - &xpc_remote_copy_buffer_base); - if (xpc_remote_copy_buffer == NULL) - return -ENOMEM; snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part"); snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan"); - xpc_sysctl = register_sysctl_table(xpc_sys_dir); - - /* - * The first few fields of each entry of xpc_partitions[] need to - * be initialized now so that calls to xpc_connect() and - * xpc_disconnect() can be made prior to the activation of any remote - * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE - * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING - * PARTITION HAS BEEN ACTIVATED. - */ - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { - part = &xpc_partitions[partid]; - - DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part)); - - part->act_IRQ_rcvd = 0; - spin_lock_init(&part->act_lock); - part->act_state = XPC_P_INACTIVE; - XPC_SET_REASON(part, 0, 0); + if (is_shub()) { + /* + * The ia64-sn2 architecture supports at most 64 partitions. + * And the inability to unregister remote amos restricts us + * further to only support exactly 64 partitions on this + * architecture, no less. + */ + if (xp_max_npartitions != 64) { + dev_err(xpc_part, "max #of partitions not set to 64\n"); + ret = -EINVAL; + } else { + ret = xpc_init_sn2(); + } - init_timer(&part->disengage_request_timer); - part->disengage_request_timer.function = - xpc_timeout_partition_disengage_request; - part->disengage_request_timer.data = (unsigned long)part; + } else if (is_uv()) { + ret = xpc_init_uv(); - part->setup_state = XPC_P_UNSET; - init_waitqueue_head(&part->teardown_wq); - atomic_set(&part->references, 0); + } else { + ret = -ENODEV; } - /* - * Open up protections for IPI operations (and AMO operations on - * Shub 1.1 systems). - */ - xpc_allow_IPI_ops(); - - /* - * Interrupts being processed will increment this atomic variable and - * awaken the heartbeat thread which will process the interrupts. - */ - atomic_set(&xpc_act_IRQ_rcvd, 0); + if (ret != 0) + return ret; - /* - * This is safe to do before the xpc_hb_checker thread has started - * because the handler releases a wait queue. If an interrupt is - * received before the thread is waiting, it will not go to sleep, - * but rather immediately process the interrupt. - */ - ret = request_irq(SGI_XPC_ACTIVATE, xpc_act_IRQ_handler, 0, - "xpc hb", NULL); + ret = xpc_setup_partitions(); if (ret != 0) { - dev_err(xpc_part, "can't register ACTIVATE IRQ handler, " - "errno=%d\n", -ret); - - xpc_restrict_IPI_ops(); - - if (xpc_sysctl) - unregister_sysctl_table(xpc_sysctl); - - kfree(xpc_remote_copy_buffer_base); - return -EBUSY; + dev_err(xpc_part, "can't get memory for partition structure\n"); + goto out_1; } + xpc_sysctl = register_sysctl_table(xpc_sys_dir); + /* * Fill the partition reserved page with the information needed by * other partitions to discover we are alive and establish initial * communications. */ - xpc_rsvd_page = xpc_rsvd_page_init(); - if (xpc_rsvd_page == NULL) { - dev_err(xpc_part, "could not setup our reserved page\n"); - - free_irq(SGI_XPC_ACTIVATE, NULL); - xpc_restrict_IPI_ops(); - - if (xpc_sysctl) - unregister_sysctl_table(xpc_sysctl); - - kfree(xpc_remote_copy_buffer_base); - return -EBUSY; + ret = xpc_setup_rsvd_page(); + if (ret != 0) { + dev_err(xpc_part, "can't setup our reserved page\n"); + goto out_2; } /* add ourselves to the reboot_notifier_list */ @@ -1235,9 +1314,6 @@ xpc_init(void) if (ret != 0) dev_warn(xpc_part, "can't register die notifier\n"); - init_timer(&xpc_hb_timer); - xpc_hb_timer.function = xpc_hb_beater; - /* * The real work-horse behind xpc. This processes incoming * interrupts and monitors remote heartbeats. @@ -1245,25 +1321,8 @@ xpc_init(void) kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME); if (IS_ERR(kthread)) { dev_err(xpc_part, "failed while forking hb check thread\n"); - - /* indicate to others that our reserved page is uninitialized */ - xpc_rsvd_page->vars_pa = 0; - - /* take ourselves off of the reboot_notifier_list */ - (void)unregister_reboot_notifier(&xpc_reboot_notifier); - - /* take ourselves off of the die_notifier list */ - (void)unregister_die_notifier(&xpc_die_notifier); - - del_timer_sync(&xpc_hb_timer); - free_irq(SGI_XPC_ACTIVATE, NULL); - xpc_restrict_IPI_ops(); - - if (xpc_sysctl) - unregister_sysctl_table(xpc_sysctl); - - kfree(xpc_remote_copy_buffer_base); - return -EBUSY; + ret = -EBUSY; + goto out_3; } /* @@ -1285,11 +1344,28 @@ xpc_init(void) /* set the interface to point at XPC's functions */ xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect, - xpc_initiate_allocate, xpc_initiate_send, - xpc_initiate_send_notify, xpc_initiate_received, - xpc_initiate_partid_to_nasids); + xpc_initiate_send, xpc_initiate_send_notify, + xpc_initiate_received, xpc_initiate_partid_to_nasids); return 0; + + /* initialization was not successful */ +out_3: + xpc_teardown_rsvd_page(); + + (void)unregister_die_notifier(&xpc_die_notifier); + (void)unregister_reboot_notifier(&xpc_reboot_notifier); +out_2: + if (xpc_sysctl) + unregister_sysctl_table(xpc_sysctl); + + xpc_teardown_partitions(); +out_1: + if (is_shub()) + xpc_exit_sn2(); + else + xpc_exit_uv(); + return ret; } module_init(xpc_init); @@ -1314,9 +1390,9 @@ module_param(xpc_hb_check_interval, int, 0); MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between " "heartbeat checks."); -module_param(xpc_disengage_request_timelimit, int, 0); -MODULE_PARM_DESC(xpc_disengage_request_timelimit, "Number of seconds to wait " - "for disengage request to complete."); +module_param(xpc_disengage_timelimit, int, 0); +MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait " + "for disengage to complete."); module_param(xpc_kdebug_ignore, int, 0); MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by " diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c index 7dd4b5812c4..6722f6fe4dc 100644 --- a/drivers/misc/sgi-xp/xpc_partition.c +++ b/drivers/misc/sgi-xp/xpc_partition.c @@ -15,57 +15,22 @@ * */ -#include <linux/kernel.h> -#include <linux/sysctl.h> -#include <linux/cache.h> -#include <linux/mmzone.h> -#include <linux/nodemask.h> -#include <asm/uncached.h> -#include <asm/sn/bte.h> -#include <asm/sn/intr.h> -#include <asm/sn/sn_sal.h> -#include <asm/sn/nodepda.h> -#include <asm/sn/addrs.h> +#include <linux/device.h> +#include <linux/hardirq.h> #include "xpc.h" /* XPC is exiting flag */ int xpc_exiting; -/* SH_IPI_ACCESS shub register value on startup */ -static u64 xpc_sh1_IPI_access; -static u64 xpc_sh2_IPI_access0; -static u64 xpc_sh2_IPI_access1; -static u64 xpc_sh2_IPI_access2; -static u64 xpc_sh2_IPI_access3; - -/* original protection values for each node */ -u64 xpc_prot_vec[MAX_NUMNODES]; - /* this partition's reserved page pointers */ struct xpc_rsvd_page *xpc_rsvd_page; -static u64 *xpc_part_nasids; -static u64 *xpc_mach_nasids; -struct xpc_vars *xpc_vars; -struct xpc_vars_part *xpc_vars_part; +static unsigned long *xpc_part_nasids; +unsigned long *xpc_mach_nasids; -static int xp_nasid_mask_bytes; /* actual size in bytes of nasid mask */ -static int xp_nasid_mask_words; /* actual size in words of nasid mask */ - -/* - * For performance reasons, each entry of xpc_partitions[] is cacheline - * aligned. And xpc_partitions[] is padded with an additional entry at the - * end so that the last legitimate entry doesn't share its cacheline with - * another variable. - */ -struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1]; +static int xpc_nasid_mask_nbytes; /* #of bytes in nasid mask */ +int xpc_nasid_mask_nlongs; /* #of longs in nasid mask */ -/* - * Generic buffer used to store a local copy of portions of a remote - * partition's reserved page (either its header and part_nasids mask, - * or its vars). - */ -char *xpc_remote_copy_buffer; -void *xpc_remote_copy_buffer_base; +struct xpc_partition *xpc_partitions; /* * Guarantee that the kmalloc'd memory is cacheline aligned. @@ -95,56 +60,59 @@ xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base) * Given a nasid, get the physical address of the partition's reserved page * for that nasid. This function returns 0 on any error. */ -static u64 +static unsigned long xpc_get_rsvd_page_pa(int nasid) { - bte_result_t bte_res; - s64 status; + enum xp_retval ret; u64 cookie = 0; - u64 rp_pa = nasid; /* seed with nasid */ - u64 len = 0; - u64 buf = buf; - u64 buf_len = 0; + unsigned long rp_pa = nasid; /* seed with nasid */ + size_t len = 0; + size_t buf_len = 0; + void *buf = buf; void *buf_base = NULL; while (1) { - status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa, - &len); + /* !!! rp_pa will need to be _gpa on UV. + * ??? So do we save it into the architecture specific parts + * ??? of the xpc_partition structure? Do we rename this + * ??? function or have two versions? Rename rp_pa for UV to + * ??? rp_gpa? + */ + ret = xpc_get_partition_rsvd_page_pa(buf, &cookie, &rp_pa, + &len); - dev_dbg(xpc_part, "SAL returned with status=%li, cookie=" - "0x%016lx, address=0x%016lx, len=0x%016lx\n", - status, cookie, rp_pa, len); + dev_dbg(xpc_part, "SAL returned with ret=%d, cookie=0x%016lx, " + "address=0x%016lx, len=0x%016lx\n", ret, + (unsigned long)cookie, rp_pa, len); - if (status != SALRET_MORE_PASSES) + if (ret != xpNeedMoreInfo) break; + /* !!! L1_CACHE_ALIGN() is only a sn2-bte_copy requirement */ if (L1_CACHE_ALIGN(len) > buf_len) { kfree(buf_base); buf_len = L1_CACHE_ALIGN(len); - buf = (u64)xpc_kmalloc_cacheline_aligned(buf_len, - GFP_KERNEL, - &buf_base); + buf = xpc_kmalloc_cacheline_aligned(buf_len, GFP_KERNEL, + &buf_base); if (buf_base == NULL) { dev_err(xpc_part, "unable to kmalloc " "len=0x%016lx\n", buf_len); - status = SALRET_ERROR; + ret = xpNoMemory; break; } } - bte_res = xp_bte_copy(rp_pa, buf, buf_len, - (BTE_NOTIFY | BTE_WACQUIRE), NULL); - if (bte_res != BTE_SUCCESS) { - dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res); - status = SALRET_ERROR; + ret = xp_remote_memcpy(xp_pa(buf), rp_pa, buf_len); + if (ret != xpSuccess) { + dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret); break; } } kfree(buf_base); - if (status != SALRET_OK) + if (ret != xpSuccess) rp_pa = 0; dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa); @@ -156,300 +124,77 @@ xpc_get_rsvd_page_pa(int nasid) * other partitions to discover we are alive and establish initial * communications. */ -struct xpc_rsvd_page * -xpc_rsvd_page_init(void) +int +xpc_setup_rsvd_page(void) { + int ret; struct xpc_rsvd_page *rp; - AMO_t *amos_page; - u64 rp_pa, nasid_array = 0; - int i, ret; + unsigned long rp_pa; + unsigned long new_ts_jiffies; /* get the local reserved page's address */ preempt_disable(); - rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id())); + rp_pa = xpc_get_rsvd_page_pa(xp_cpu_to_nasid(smp_processor_id())); preempt_enable(); if (rp_pa == 0) { dev_err(xpc_part, "SAL failed to locate the reserved page\n"); - return NULL; + return -ESRCH; } rp = (struct xpc_rsvd_page *)__va(rp_pa); - if (rp->partid != sn_partition_id) { - dev_err(xpc_part, "the reserved page's partid of %d should be " - "%d\n", rp->partid, sn_partition_id); - return NULL; + if (rp->SAL_version < 3) { + /* SAL_versions < 3 had a SAL_partid defined as a u8 */ + rp->SAL_partid &= 0xff; + } + BUG_ON(rp->SAL_partid != xp_partition_id); + + if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) { + dev_err(xpc_part, "the reserved page's partid of %d is outside " + "supported range (< 0 || >= %d)\n", rp->SAL_partid, + xp_max_npartitions); + return -EINVAL; } rp->version = XPC_RP_VERSION; + rp->max_npartitions = xp_max_npartitions; /* establish the actual sizes of the nasid masks */ if (rp->SAL_version == 1) { /* SAL_version 1 didn't set the nasids_size field */ - rp->nasids_size = 128; + rp->SAL_nasids_size = 128; } - xp_nasid_mask_bytes = rp->nasids_size; - xp_nasid_mask_words = xp_nasid_mask_bytes / 8; + xpc_nasid_mask_nbytes = rp->SAL_nasids_size; + xpc_nasid_mask_nlongs = BITS_TO_LONGS(rp->SAL_nasids_size * + BITS_PER_BYTE); /* setup the pointers to the various items in the reserved page */ xpc_part_nasids = XPC_RP_PART_NASIDS(rp); xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp); - xpc_vars = XPC_RP_VARS(rp); - xpc_vars_part = XPC_RP_VARS_PART(rp); - - /* - * Before clearing xpc_vars, see if a page of AMOs had been previously - * allocated. If not we'll need to allocate one and set permissions - * so that cross-partition AMOs are allowed. - * - * The allocated AMO page needs MCA reporting to remain disabled after - * XPC has unloaded. To make this work, we keep a copy of the pointer - * to this page (i.e., amos_page) in the struct xpc_vars structure, - * which is pointed to by the reserved page, and re-use that saved copy - * on subsequent loads of XPC. This AMO page is never freed, and its - * memory protections are never restricted. - */ - amos_page = xpc_vars->amos_page; - if (amos_page == NULL) { - amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1)); - if (amos_page == NULL) { - dev_err(xpc_part, "can't allocate page of AMOs\n"); - return NULL; - } - - /* - * Open up AMO-R/W to cpu. This is done for Shub 1.1 systems - * when xpc_allow_IPI_ops() is called via xpc_hb_init(). - */ - if (!enable_shub_wars_1_1()) { - ret = sn_change_memprotect(ia64_tpa((u64)amos_page), - PAGE_SIZE, - SN_MEMPROT_ACCESS_CLASS_1, - &nasid_array); - if (ret != 0) { - dev_err(xpc_part, "can't change memory " - "protections\n"); - uncached_free_page(__IA64_UNCACHED_OFFSET | - TO_PHYS((u64)amos_page), 1); - return NULL; - } - } - } else if (!IS_AMO_ADDRESS((u64)amos_page)) { - /* - * EFI's XPBOOT can also set amos_page in the reserved page, - * but it happens to leave it as an uncached physical address - * and we need it to be an uncached virtual, so we'll have to - * convert it. - */ - if (!IS_AMO_PHYS_ADDRESS((u64)amos_page)) { - dev_err(xpc_part, "previously used amos_page address " - "is bad = 0x%p\n", (void *)amos_page); - return NULL; - } - amos_page = (AMO_t *)TO_AMO((u64)amos_page); - } - - /* clear xpc_vars */ - memset(xpc_vars, 0, sizeof(struct xpc_vars)); - - xpc_vars->version = XPC_V_VERSION; - xpc_vars->act_nasid = cpuid_to_nasid(0); - xpc_vars->act_phys_cpuid = cpu_physical_id(0); - xpc_vars->vars_part_pa = __pa(xpc_vars_part); - xpc_vars->amos_page_pa = ia64_tpa((u64)amos_page); - xpc_vars->amos_page = amos_page; /* save for next load of XPC */ - - /* clear xpc_vars_part */ - memset((u64 *)xpc_vars_part, 0, sizeof(struct xpc_vars_part) * - XP_MAX_PARTITIONS); - - /* initialize the activate IRQ related AMO variables */ - for (i = 0; i < xp_nasid_mask_words; i++) - (void)xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i); - - /* initialize the engaged remote partitions related AMO variables */ - (void)xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO); - (void)xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO); - /* timestamp of when reserved page was setup by XPC */ - rp->stamp = CURRENT_TIME; + ret = xpc_setup_rsvd_page_sn(rp); + if (ret != 0) + return ret; /* + * Set timestamp of when reserved page was setup by XPC. * This signifies to the remote partition that our reserved * page is initialized. */ - rp->vars_pa = __pa(xpc_vars); + new_ts_jiffies = jiffies; + if (new_ts_jiffies == 0 || new_ts_jiffies == rp->ts_jiffies) + new_ts_jiffies++; + rp->ts_jiffies = new_ts_jiffies; - return rp; + xpc_rsvd_page = rp; + return 0; } -/* - * Change protections to allow IPI operations (and AMO operations on - * Shub 1.1 systems). - */ void -xpc_allow_IPI_ops(void) +xpc_teardown_rsvd_page(void) { - int node; - int nasid; - - /* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */ - - if (is_shub2()) { - xpc_sh2_IPI_access0 = - (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0)); - xpc_sh2_IPI_access1 = - (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1)); - xpc_sh2_IPI_access2 = - (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2)); - xpc_sh2_IPI_access3 = - (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3)); - - for_each_online_node(node) { - nasid = cnodeid_to_nasid(node); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0), - -1UL); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1), - -1UL); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2), - -1UL); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3), - -1UL); - } - - } else { - xpc_sh1_IPI_access = - (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH1_IPI_ACCESS)); - - for_each_online_node(node) { - nasid = cnodeid_to_nasid(node); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS), - -1UL); - - /* - * Since the BIST collides with memory operations on - * SHUB 1.1 sn_change_memprotect() cannot be used. - */ - if (enable_shub_wars_1_1()) { - /* open up everything */ - xpc_prot_vec[node] = (u64)HUB_L((u64 *) - GLOBAL_MMR_ADDR - (nasid, - SH1_MD_DQLP_MMR_DIR_PRIVEC0)); - HUB_S((u64 *) - GLOBAL_MMR_ADDR(nasid, - SH1_MD_DQLP_MMR_DIR_PRIVEC0), - -1UL); - HUB_S((u64 *) - GLOBAL_MMR_ADDR(nasid, - SH1_MD_DQRP_MMR_DIR_PRIVEC0), - -1UL); - } - } - } -} - -/* - * Restrict protections to disallow IPI operations (and AMO operations on - * Shub 1.1 systems). - */ -void -xpc_restrict_IPI_ops(void) -{ - int node; - int nasid; - - /* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */ - - if (is_shub2()) { - - for_each_online_node(node) { - nasid = cnodeid_to_nasid(node); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0), - xpc_sh2_IPI_access0); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1), - xpc_sh2_IPI_access1); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2), - xpc_sh2_IPI_access2); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3), - xpc_sh2_IPI_access3); - } - - } else { - - for_each_online_node(node) { - nasid = cnodeid_to_nasid(node); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS), - xpc_sh1_IPI_access); - - if (enable_shub_wars_1_1()) { - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, - SH1_MD_DQLP_MMR_DIR_PRIVEC0), - xpc_prot_vec[node]); - HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, - SH1_MD_DQRP_MMR_DIR_PRIVEC0), - xpc_prot_vec[node]); - } - } - } -} - -/* - * At periodic intervals, scan through all active partitions and ensure - * their heartbeat is still active. If not, the partition is deactivated. - */ -void -xpc_check_remote_hb(void) -{ - struct xpc_vars *remote_vars; - struct xpc_partition *part; - short partid; - bte_result_t bres; - - remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer; - - for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) { - - if (xpc_exiting) - break; - - if (partid == sn_partition_id) - continue; - - part = &xpc_partitions[partid]; - - if (part->act_state == XPC_P_INACTIVE || - part->act_state == XPC_P_DEACTIVATING) { - continue; - } - - /* pull the remote_hb cache line */ - bres = xp_bte_copy(part->remote_vars_pa, - (u64)remote_vars, - XPC_RP_VARS_SIZE, - (BTE_NOTIFY | BTE_WACQUIRE), NULL); - if (bres != BTE_SUCCESS) { - XPC_DEACTIVATE_PARTITION(part, - xpc_map_bte_errors(bres)); - continue; - } - - dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat" - " = %ld, heartbeat_offline = %ld, HB_mask = 0x%lx\n", - partid, remote_vars->heartbeat, part->last_heartbeat, - remote_vars->heartbeat_offline, - remote_vars->heartbeating_to_mask); - - if (((remote_vars->heartbeat == part->last_heartbeat) && - (remote_vars->heartbeat_offline == 0)) || - !xpc_hb_allowed(sn_partition_id, remote_vars)) { - - XPC_DEACTIVATE_PARTITION(part, xpNoHeartbeat); - continue; - } - - part->last_heartbeat = remote_vars->heartbeat; - } + /* a zero timestamp indicates our rsvd page is not initialized */ + xpc_rsvd_page->ts_jiffies = 0; } /* @@ -459,11 +204,12 @@ xpc_check_remote_hb(void) * is large enough to contain a copy of their reserved page header and * part_nasids mask. */ -static enum xp_retval -xpc_get_remote_rp(int nasid, u64 *discovered_nasids, - struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa) +enum xp_retval +xpc_get_remote_rp(int nasid, unsigned long *discovered_nasids, + struct xpc_rsvd_page *remote_rp, unsigned long *remote_rp_pa) { - int bres, i; + int l; + enum xp_retval ret; /* get the reserved page's physical address */ @@ -472,355 +218,45 @@ xpc_get_remote_rp(int nasid, u64 *discovered_nasids, return xpNoRsvdPageAddr; /* pull over the reserved page header and part_nasids mask */ - bres = xp_bte_copy(*remote_rp_pa, (u64)remote_rp, - XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes, - (BTE_NOTIFY | BTE_WACQUIRE), NULL); - if (bres != BTE_SUCCESS) - return xpc_map_bte_errors(bres); + ret = xp_remote_memcpy(xp_pa(remote_rp), *remote_rp_pa, + XPC_RP_HEADER_SIZE + xpc_nasid_mask_nbytes); + if (ret != xpSuccess) + return ret; if (discovered_nasids != NULL) { - u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp); - - for (i = 0; i < xp_nasid_mask_words; i++) - discovered_nasids[i] |= remote_part_nasids[i]; - } - - /* check that the partid is for another partition */ + unsigned long *remote_part_nasids = + XPC_RP_PART_NASIDS(remote_rp); - if (remote_rp->partid < 1 || - remote_rp->partid > (XP_MAX_PARTITIONS - 1)) { - return xpInvalidPartid; + for (l = 0; l < xpc_nasid_mask_nlongs; l++) + discovered_nasids[l] |= remote_part_nasids[l]; } - if (remote_rp->partid == sn_partition_id) - return xpLocalPartid; + /* zero timestamp indicates the reserved page has not been setup */ + if (remote_rp->ts_jiffies == 0) + return xpRsvdPageNotSet; if (XPC_VERSION_MAJOR(remote_rp->version) != XPC_VERSION_MAJOR(XPC_RP_VERSION)) { return xpBadVersion; } - return xpSuccess; -} - -/* - * Get a copy of the remote partition's XPC variables from the reserved page. - * - * remote_vars points to a buffer that is cacheline aligned for BTE copies and - * assumed to be of size XPC_RP_VARS_SIZE. - */ -static enum xp_retval -xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars) -{ - int bres; - - if (remote_vars_pa == 0) - return xpVarsNotSet; - - /* pull over the cross partition variables */ - bres = xp_bte_copy(remote_vars_pa, (u64)remote_vars, XPC_RP_VARS_SIZE, - (BTE_NOTIFY | BTE_WACQUIRE), NULL); - if (bres != BTE_SUCCESS) - return xpc_map_bte_errors(bres); - - if (XPC_VERSION_MAJOR(remote_vars->version) != - XPC_VERSION_MAJOR(XPC_V_VERSION)) { - return xpBadVersion; - } - - return xpSuccess; -} - -/* - * Update the remote partition's info. - */ -static void -xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version, - struct timespec *remote_rp_stamp, u64 remote_rp_pa, - u64 remote_vars_pa, struct xpc_vars *remote_vars) -{ - part->remote_rp_version = remote_rp_version; - dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n", - part->remote_rp_version); - - part->remote_rp_stamp = *remote_rp_stamp; - dev_dbg(xpc_part, " remote_rp_stamp (tv_sec = 0x%lx tv_nsec = 0x%lx\n", - part->remote_rp_stamp.tv_sec, part->remote_rp_stamp.tv_nsec); - - part->remote_rp_pa = remote_rp_pa; - dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa); - - part->remote_vars_pa = remote_vars_pa; - dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n", - part->remote_vars_pa); - - part->last_heartbeat = remote_vars->heartbeat; - dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n", - part->last_heartbeat); - - part->remote_vars_part_pa = remote_vars->vars_part_pa; - dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n", - part->remote_vars_part_pa); - - part->remote_act_nasid = remote_vars->act_nasid; - dev_dbg(xpc_part, " remote_act_nasid = 0x%x\n", - part->remote_act_nasid); - - part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid; - dev_dbg(xpc_part, " remote_act_phys_cpuid = 0x%x\n", - part->remote_act_phys_cpuid); - - part->remote_amos_page_pa = remote_vars->amos_page_pa; - dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n", - part->remote_amos_page_pa); - - part->remote_vars_version = remote_vars->version; - dev_dbg(xpc_part, " remote_vars_version = 0x%x\n", - part->remote_vars_version); -} - -/* - * Prior code has determined the nasid which generated an IPI. Inspect - * that nasid to determine if its partition needs to be activated or - * deactivated. - * - * A partition is consider "awaiting activation" if our partition - * flags indicate it is not active and it has a heartbeat. A - * partition is considered "awaiting deactivation" if our partition - * flags indicate it is active but it has no heartbeat or it is not - * sending its heartbeat to us. - * - * To determine the heartbeat, the remote nasid must have a properly - * initialized reserved page. - */ -static void -xpc_identify_act_IRQ_req(int nasid) -{ - struct xpc_rsvd_page *remote_rp; - struct xpc_vars *remote_vars; - u64 remote_rp_pa; - u64 remote_vars_pa; - int remote_rp_version; - int reactivate = 0; - int stamp_diff; - struct timespec remote_rp_stamp = { 0, 0 }; - short partid; - struct xpc_partition *part; - enum xp_retval ret; - - /* pull over the reserved page structure */ - - remote_rp = (struct xpc_rsvd_page *)xpc_remote_copy_buffer; - - ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa); - if (ret != xpSuccess) { - dev_warn(xpc_part, "unable to get reserved page from nasid %d, " - "which sent interrupt, reason=%d\n", nasid, ret); - return; - } - - remote_vars_pa = remote_rp->vars_pa; - remote_rp_version = remote_rp->version; - if (XPC_SUPPORTS_RP_STAMP(remote_rp_version)) - remote_rp_stamp = remote_rp->stamp; - - partid = remote_rp->partid; - part = &xpc_partitions[partid]; - - /* pull over the cross partition variables */ - - remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer; - - ret = xpc_get_remote_vars(remote_vars_pa, remote_vars); - if (ret != xpSuccess) { - - dev_warn(xpc_part, "unable to get XPC variables from nasid %d, " - "which sent interrupt, reason=%d\n", nasid, ret); - - XPC_DEACTIVATE_PARTITION(part, ret); - return; - } - - part->act_IRQ_rcvd++; - - dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = " - "%ld:0x%lx\n", (int)nasid, (int)partid, part->act_IRQ_rcvd, - remote_vars->heartbeat, remote_vars->heartbeating_to_mask); - - if (xpc_partition_disengaged(part) && - part->act_state == XPC_P_INACTIVE) { - - xpc_update_partition_info(part, remote_rp_version, - &remote_rp_stamp, remote_rp_pa, - remote_vars_pa, remote_vars); - - if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) { - if (xpc_partition_disengage_requested(1UL << partid)) { - /* - * Other side is waiting on us to disengage, - * even though we already have. - */ - return; - } - } else { - /* other side doesn't support disengage requests */ - xpc_clear_partition_disengage_request(1UL << partid); - } - - xpc_activate_partition(part); - return; - } - - DBUG_ON(part->remote_rp_version == 0); - DBUG_ON(part->remote_vars_version == 0); - - if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) { - DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part-> - remote_vars_version)); - - if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) { - DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars-> - version)); - /* see if the other side rebooted */ - if (part->remote_amos_page_pa == - remote_vars->amos_page_pa && - xpc_hb_allowed(sn_partition_id, remote_vars)) { - /* doesn't look that way, so ignore the IPI */ - return; - } - } - - /* - * Other side rebooted and previous XPC didn't support the - * disengage request, so we don't need to do anything special. - */ - - xpc_update_partition_info(part, remote_rp_version, - &remote_rp_stamp, remote_rp_pa, - remote_vars_pa, remote_vars); - part->reactivate_nasid = nasid; - XPC_DEACTIVATE_PARTITION(part, xpReactivating); - return; - } - - DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)); - - if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) { - DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version)); - - /* - * Other side rebooted and previous XPC did support the - * disengage request, but the new one doesn't. - */ - - xpc_clear_partition_engaged(1UL << partid); - xpc_clear_partition_disengage_request(1UL << partid); - - xpc_update_partition_info(part, remote_rp_version, - &remote_rp_stamp, remote_rp_pa, - remote_vars_pa, remote_vars); - reactivate = 1; - - } else { - DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version)); - - stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp, - &remote_rp_stamp); - if (stamp_diff != 0) { - DBUG_ON(stamp_diff >= 0); - - /* - * Other side rebooted and the previous XPC did support - * the disengage request, as does the new one. - */ - - DBUG_ON(xpc_partition_engaged(1UL << partid)); - DBUG_ON(xpc_partition_disengage_requested(1UL << - partid)); - - xpc_update_partition_info(part, remote_rp_version, - &remote_rp_stamp, - remote_rp_pa, remote_vars_pa, - remote_vars); - reactivate = 1; - } - } - - if (part->disengage_request_timeout > 0 && - !xpc_partition_disengaged(part)) { - /* still waiting on other side to disengage from us */ - return; - } - - if (reactivate) { - part->reactivate_nasid = nasid; - XPC_DEACTIVATE_PARTITION(part, xpReactivating); - - } else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) && - xpc_partition_disengage_requested(1UL << partid)) { - XPC_DEACTIVATE_PARTITION(part, xpOtherGoingDown); + /* check that both remote and local partids are valid for each side */ + if (remote_rp->SAL_partid < 0 || + remote_rp->SAL_partid >= xp_max_npartitions || + remote_rp->max_npartitions <= xp_partition_id) { + return xpInvalidPartid; } -} -/* - * Loop through the activation AMO variables and process any bits - * which are set. Each bit indicates a nasid sending a partition - * activation or deactivation request. - * - * Return #of IRQs detected. - */ -int -xpc_identify_act_IRQ_sender(void) -{ - int word, bit; - u64 nasid_mask; - u64 nasid; /* remote nasid */ - int n_IRQs_detected = 0; - AMO_t *act_amos; - - act_amos = xpc_vars->amos_page + XPC_ACTIVATE_IRQ_AMOS; - - /* scan through act AMO variable looking for non-zero entries */ - for (word = 0; word < xp_nasid_mask_words; word++) { - - if (xpc_exiting) - break; - - nasid_mask = xpc_IPI_receive(&act_amos[word]); - if (nasid_mask == 0) { - /* no IRQs from nasids in this variable */ - continue; - } - - dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word, - nasid_mask); - - /* - * If this nasid has been added to the machine since - * our partition was reset, this will retain the - * remote nasid in our reserved pages machine mask. - * This is used in the event of module reload. - */ - xpc_mach_nasids[word] |= nasid_mask; - - /* locate the nasid(s) which sent interrupts */ + if (remote_rp->SAL_partid == xp_partition_id) + return xpLocalPartid; - for (bit = 0; bit < (8 * sizeof(u64)); bit++) { - if (nasid_mask & (1UL << bit)) { - n_IRQs_detected++; - nasid = XPC_NASID_FROM_W_B(word, bit); - dev_dbg(xpc_part, "interrupt from nasid %ld\n", - nasid); - xpc_identify_act_IRQ_req(nasid); - } - } - } - return n_IRQs_detected; + return xpSuccess; } /* - * See if the other side has responded to a partition disengage request - * from us. + * See if the other side has responded to a partition deactivate request + * from us. Though we requested the remote partition to deactivate with regard + * to us, we really only need to wait for the other side to disengage from us. */ int xpc_partition_disengaged(struct xpc_partition *part) @@ -828,41 +264,37 @@ xpc_partition_disengaged(struct xpc_partition *part) short partid = XPC_PARTID(part); int disengaged; - disengaged = (xpc_partition_engaged(1UL << partid) == 0); - if (part->disengage_request_timeout) { + disengaged = !xpc_partition_engaged(partid); + if (part->disengage_timeout) { if (!disengaged) { - if (time_before(jiffies, - part->disengage_request_timeout)) { + if (time_is_after_jiffies(part->disengage_timeout)) { /* timelimit hasn't been reached yet */ return 0; } /* - * Other side hasn't responded to our disengage + * Other side hasn't responded to our deactivate * request in a timely fashion, so assume it's dead. */ - dev_info(xpc_part, "disengage from remote partition %d " - "timed out\n", partid); - xpc_disengage_request_timedout = 1; - xpc_clear_partition_engaged(1UL << partid); + dev_info(xpc_part, "deactivate request to remote " + "partition %d timed out\n", partid); + xpc_disengage_timedout = 1; + xpc_assume_partition_disengaged(partid); disengaged = 1; } - part->disengage_request_timeout = 0; + part->disengage_timeout = 0; /* cancel the timer function, provided it's not us */ - if (!in_interrupt()) { - del_singleshot_timer_sync(&part-> - disengage_request_timer); - } + if (!in_interrupt()) + del_singleshot_timer_sync(&part->disengage_timer); - DBUG_ON(part->act_state != XPC_P_DEACTIVATING && - part->act_state != XPC_P_INACTIVE); - if (part->act_state != XPC_P_INACTIVE) + DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING && + part->act_state != XPC_P_AS_INACTIVE); + if (part->act_state != XPC_P_AS_INACTIVE) xpc_wakeup_channel_mgr(part); - if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) - xpc_cancel_partition_disengage_request(part); + xpc_cancel_partition_deactivation_request(part); } return disengaged; } @@ -879,8 +311,8 @@ xpc_mark_partition_active(struct xpc_partition *part) dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part)); spin_lock_irqsave(&part->act_lock, irq_flags); - if (part->act_state == XPC_P_ACTIVATING) { - part->act_state = XPC_P_ACTIVE; + if (part->act_state == XPC_P_AS_ACTIVATING) { + part->act_state = XPC_P_AS_ACTIVE; ret = xpSuccess; } else { DBUG_ON(part->reason == xpSuccess); @@ -892,7 +324,7 @@ xpc_mark_partition_active(struct xpc_partition *part) } /* - * Notify XPC that the partition is down. + * Start the process of deactivating the specified partition. */ void xpc_deactivate_partition(const int line, struct xpc_partition *part, @@ -902,16 +334,16 @@ xpc_deactivate_partition(const int line, struct xpc_partition *part, spin_lock_irqsave(&part->act_lock, irq_flags); - if (part->act_state == XPC_P_INACTIVE) { + if (part->act_state == XPC_P_AS_INACTIVE) { XPC_SET_REASON(part, reason, line); spin_unlock_irqrestore(&part->act_lock, irq_flags); if (reason == xpReactivating) { /* we interrupt ourselves to reactivate partition */ - xpc_IPI_send_reactivate(part); + xpc_request_partition_reactivation(part); } return; } - if (part->act_state == XPC_P_DEACTIVATING) { + if (part->act_state == XPC_P_AS_DEACTIVATING) { if ((part->reason == xpUnloading && reason != xpUnloading) || reason == xpReactivating) { XPC_SET_REASON(part, reason, line); @@ -920,22 +352,18 @@ xpc_deactivate_partition(const int line, struct xpc_partition *part, return; } - part->act_state = XPC_P_DEACTIVATING; + part->act_state = XPC_P_AS_DEACTIVATING; XPC_SET_REASON(part, reason, line); spin_unlock_irqrestore(&part->act_lock, irq_flags); - if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) { - xpc_request_partition_disengage(part); - xpc_IPI_send_disengage(part); + /* ask remote partition to deactivate with regard to us */ + xpc_request_partition_deactivation(part); - /* set a timelimit on the disengage request */ - part->disengage_request_timeout = jiffies + - (xpc_disengage_request_timelimit * HZ); - part->disengage_request_timer.expires = - part->disengage_request_timeout; - add_timer(&part->disengage_request_timer); - } + /* set a timelimit on the disengage phase of the deactivation request */ + part->disengage_timeout = jiffies + (xpc_disengage_timelimit * HZ); + part->disengage_timer.expires = part->disengage_timeout; + add_timer(&part->disengage_timer); dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n", XPC_PARTID(part), reason); @@ -955,7 +383,7 @@ xpc_mark_partition_inactive(struct xpc_partition *part) XPC_PARTID(part)); spin_lock_irqsave(&part->act_lock, irq_flags); - part->act_state = XPC_P_INACTIVE; + part->act_state = XPC_P_AS_INACTIVE; spin_unlock_irqrestore(&part->act_lock, irq_flags); part->remote_rp_pa = 0; } @@ -974,28 +402,22 @@ xpc_discovery(void) { void *remote_rp_base; struct xpc_rsvd_page *remote_rp; - struct xpc_vars *remote_vars; - u64 remote_rp_pa; - u64 remote_vars_pa; + unsigned long remote_rp_pa; int region; int region_size; int max_regions; int nasid; struct xpc_rsvd_page *rp; - short partid; - struct xpc_partition *part; - u64 *discovered_nasids; + unsigned long *discovered_nasids; enum xp_retval ret; remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE + - xp_nasid_mask_bytes, + xpc_nasid_mask_nbytes, GFP_KERNEL, &remote_rp_base); if (remote_rp == NULL) return; - remote_vars = (struct xpc_vars *)remote_rp; - - discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words, + discovered_nasids = kzalloc(sizeof(long) * xpc_nasid_mask_nlongs, GFP_KERNEL); if (discovered_nasids == NULL) { kfree(remote_rp_base); @@ -1010,7 +432,7 @@ xpc_discovery(void) * protection is in regards to memory, IOI and IPI. */ max_regions = 64; - region_size = sn_region_size; + region_size = xp_region_size; switch (region_size) { case 128: @@ -1038,28 +460,28 @@ xpc_discovery(void) dev_dbg(xpc_part, "checking nasid %d\n", nasid); - if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) { + if (test_bit(nasid / 2, xpc_part_nasids)) { dev_dbg(xpc_part, "PROM indicates Nasid %d is " "part of the local partition; skipping " "region\n", nasid); break; } - if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) { + if (!(test_bit(nasid / 2, xpc_mach_nasids))) { dev_dbg(xpc_part, "PROM indicates Nasid %d was " "not on Numa-Link network at reset\n", nasid); continue; } - if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) { + if (test_bit(nasid / 2, discovered_nasids)) { dev_dbg(xpc_part, "Nasid %d is part of a " "partition which was previously " "discovered\n", nasid); continue; } - /* pull over the reserved page structure */ + /* pull over the rsvd page header & part_nasids mask */ ret = xpc_get_remote_rp(nasid, discovered_nasids, remote_rp, &remote_rp_pa); @@ -1074,72 +496,8 @@ xpc_discovery(void) continue; } - remote_vars_pa = remote_rp->vars_pa; - - partid = remote_rp->partid; - part = &xpc_partitions[partid]; - - /* pull over the cross partition variables */ - - ret = xpc_get_remote_vars(remote_vars_pa, remote_vars); - if (ret != xpSuccess) { - dev_dbg(xpc_part, "unable to get XPC variables " - "from nasid %d, reason=%d\n", nasid, - ret); - - XPC_DEACTIVATE_PARTITION(part, ret); - continue; - } - - if (part->act_state != XPC_P_INACTIVE) { - dev_dbg(xpc_part, "partition %d on nasid %d is " - "already activating\n", partid, nasid); - break; - } - - /* - * Register the remote partition's AMOs with SAL so it - * can handle and cleanup errors within that address - * range should the remote partition go down. We don't - * unregister this range because it is difficult to - * tell when outstanding writes to the remote partition - * are finished and thus when it is thus safe to - * unregister. This should not result in wasted space - * in the SAL xp_addr_region table because we should - * get the same page for remote_act_amos_pa after - * module reloads and system reboots. - */ - if (sn_register_xp_addr_region - (remote_vars->amos_page_pa, PAGE_SIZE, 1) < 0) { - dev_dbg(xpc_part, - "partition %d failed to " - "register xp_addr region 0x%016lx\n", - partid, remote_vars->amos_page_pa); - - XPC_SET_REASON(part, xpPhysAddrRegFailed, - __LINE__); - break; - } - - /* - * The remote nasid is valid and available. - * Send an interrupt to that nasid to notify - * it that we are ready to begin activation. - */ - dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, " - "nasid %d, phys_cpuid 0x%x\n", - remote_vars->amos_page_pa, - remote_vars->act_nasid, - remote_vars->act_phys_cpuid); - - if (XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars-> - version)) { - part->remote_amos_page_pa = - remote_vars->amos_page_pa; - xpc_mark_partition_disengaged(part); - xpc_cancel_partition_disengage_request(part); - } - xpc_IPI_send_activate(remote_vars); + xpc_request_partition_activation(remote_rp, + remote_rp_pa, nasid); } } @@ -1155,20 +513,16 @@ enum xp_retval xpc_initiate_partid_to_nasids(short partid, void *nasid_mask) { struct xpc_partition *part; - u64 part_nasid_pa; - int bte_res; + unsigned long part_nasid_pa; part = &xpc_partitions[partid]; if (part->remote_rp_pa == 0) return xpPartitionDown; - memset(nasid_mask, 0, XP_NASID_MASK_BYTES); - - part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa); + memset(nasid_mask, 0, xpc_nasid_mask_nbytes); - bte_res = xp_bte_copy(part_nasid_pa, (u64)nasid_mask, - xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE), - NULL); + part_nasid_pa = (unsigned long)XPC_RP_PART_NASIDS(part->remote_rp_pa); - return xpc_map_bte_errors(bte_res); + return xp_remote_memcpy(xp_pa(nasid_mask), part_nasid_pa, + xpc_nasid_mask_nbytes); } diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c new file mode 100644 index 00000000000..b4882ccf634 --- /dev/null +++ b/drivers/misc/sgi-xp/xpc_sn2.c @@ -0,0 +1,2404 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +/* + * Cross Partition Communication (XPC) sn2-based functions. + * + * Architecture specific implementation of common functions. + * + */ + +#include <linux/delay.h> +#include <asm/uncached.h> +#include <asm/sn/mspec.h> +#include <asm/sn/sn_sal.h> +#include "xpc.h" + +/* + * Define the number of u64s required to represent all the C-brick nasids + * as a bitmap. The cross-partition kernel modules deal only with + * C-brick nasids, thus the need for bitmaps which don't account for + * odd-numbered (non C-brick) nasids. + */ +#define XPC_MAX_PHYSNODES_SN2 (MAX_NUMALINK_NODES / 2) +#define XP_NASID_MASK_BYTES_SN2 ((XPC_MAX_PHYSNODES_SN2 + 7) / 8) +#define XP_NASID_MASK_WORDS_SN2 ((XPC_MAX_PHYSNODES_SN2 + 63) / 64) + +/* + * Memory for XPC's amo variables is allocated by the MSPEC driver. These + * pages are located in the lowest granule. The lowest granule uses 4k pages + * for cached references and an alternate TLB handler to never provide a + * cacheable mapping for the entire region. This will prevent speculative + * reading of cached copies of our lines from being issued which will cause + * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 + * amo variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of + * NOTIFY IRQs, 128 amo variables (based on XP_NASID_MASK_WORDS_SN2) to identify + * the senders of ACTIVATE IRQs, 1 amo variable to identify which remote + * partitions (i.e., XPCs) consider themselves currently engaged with the + * local XPC and 1 amo variable to request partition deactivation. + */ +#define XPC_NOTIFY_IRQ_AMOS_SN2 0 +#define XPC_ACTIVATE_IRQ_AMOS_SN2 (XPC_NOTIFY_IRQ_AMOS_SN2 + \ + XP_MAX_NPARTITIONS_SN2) +#define XPC_ENGAGED_PARTITIONS_AMO_SN2 (XPC_ACTIVATE_IRQ_AMOS_SN2 + \ + XP_NASID_MASK_WORDS_SN2) +#define XPC_DEACTIVATE_REQUEST_AMO_SN2 (XPC_ENGAGED_PARTITIONS_AMO_SN2 + 1) + +/* + * Buffer used to store a local copy of portions of a remote partition's + * reserved page (either its header and part_nasids mask, or its vars). + */ +static void *xpc_remote_copy_buffer_base_sn2; +static char *xpc_remote_copy_buffer_sn2; + +static struct xpc_vars_sn2 *xpc_vars_sn2; +static struct xpc_vars_part_sn2 *xpc_vars_part_sn2; + +static int +xpc_setup_partitions_sn_sn2(void) +{ + /* nothing needs to be done */ + return 0; +} + +/* SH_IPI_ACCESS shub register value on startup */ +static u64 xpc_sh1_IPI_access_sn2; +static u64 xpc_sh2_IPI_access0_sn2; +static u64 xpc_sh2_IPI_access1_sn2; +static u64 xpc_sh2_IPI_access2_sn2; +static u64 xpc_sh2_IPI_access3_sn2; + +/* + * Change protections to allow IPI operations. + */ +static void +xpc_allow_IPI_ops_sn2(void) +{ + int node; + int nasid; + + /* !!! The following should get moved into SAL. */ + if (is_shub2()) { + xpc_sh2_IPI_access0_sn2 = + (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0)); + xpc_sh2_IPI_access1_sn2 = + (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1)); + xpc_sh2_IPI_access2_sn2 = + (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2)); + xpc_sh2_IPI_access3_sn2 = + (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3)); + + for_each_online_node(node) { + nasid = cnodeid_to_nasid(node); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0), + -1UL); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1), + -1UL); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2), + -1UL); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3), + -1UL); + } + } else { + xpc_sh1_IPI_access_sn2 = + (u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH1_IPI_ACCESS)); + + for_each_online_node(node) { + nasid = cnodeid_to_nasid(node); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS), + -1UL); + } + } +} + +/* + * Restrict protections to disallow IPI operations. + */ +static void +xpc_disallow_IPI_ops_sn2(void) +{ + int node; + int nasid; + + /* !!! The following should get moved into SAL. */ + if (is_shub2()) { + for_each_online_node(node) { + nasid = cnodeid_to_nasid(node); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0), + xpc_sh2_IPI_access0_sn2); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1), + xpc_sh2_IPI_access1_sn2); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2), + xpc_sh2_IPI_access2_sn2); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3), + xpc_sh2_IPI_access3_sn2); + } + } else { + for_each_online_node(node) { + nasid = cnodeid_to_nasid(node); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS), + xpc_sh1_IPI_access_sn2); + } + } +} + +/* + * The following set of functions are used for the sending and receiving of + * IRQs (also known as IPIs). There are two flavors of IRQs, one that is + * associated with partition activity (SGI_XPC_ACTIVATE) and the other that + * is associated with channel activity (SGI_XPC_NOTIFY). + */ + +static u64 +xpc_receive_IRQ_amo_sn2(struct amo *amo) +{ + return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR); +} + +static enum xp_retval +xpc_send_IRQ_sn2(struct amo *amo, u64 flag, int nasid, int phys_cpuid, + int vector) +{ + int ret = 0; + unsigned long irq_flags; + + local_irq_save(irq_flags); + + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag); + sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); + + /* + * We must always use the nofault function regardless of whether we + * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we + * didn't, we'd never know that the other partition is down and would + * keep sending IRQs and amos to it until the heartbeat times out. + */ + ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), + xp_nofault_PIOR_target)); + + local_irq_restore(irq_flags); + + return (ret == 0) ? xpSuccess : xpPioReadError; +} + +static struct amo * +xpc_init_IRQ_amo_sn2(int index) +{ + struct amo *amo = xpc_vars_sn2->amos_page + index; + + (void)xpc_receive_IRQ_amo_sn2(amo); /* clear amo variable */ + return amo; +} + +/* + * Functions associated with SGI_XPC_ACTIVATE IRQ. + */ + +/* + * Notify the heartbeat check thread that an activate IRQ has been received. + */ +static irqreturn_t +xpc_handle_activate_IRQ_sn2(int irq, void *dev_id) +{ + unsigned long irq_flags; + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + xpc_activate_IRQ_rcvd++; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + wake_up_interruptible(&xpc_activate_IRQ_wq); + return IRQ_HANDLED; +} + +/* + * Flag the appropriate amo variable and send an IRQ to the specified node. + */ +static void +xpc_send_activate_IRQ_sn2(unsigned long amos_page_pa, int from_nasid, + int to_nasid, int to_phys_cpuid) +{ + struct amo *amos = (struct amo *)__va(amos_page_pa + + (XPC_ACTIVATE_IRQ_AMOS_SN2 * + sizeof(struct amo))); + + (void)xpc_send_IRQ_sn2(&amos[BIT_WORD(from_nasid / 2)], + BIT_MASK(from_nasid / 2), to_nasid, + to_phys_cpuid, SGI_XPC_ACTIVATE); +} + +static void +xpc_send_local_activate_IRQ_sn2(int from_nasid) +{ + unsigned long irq_flags; + struct amo *amos = (struct amo *)__va(xpc_vars_sn2->amos_page_pa + + (XPC_ACTIVATE_IRQ_AMOS_SN2 * + sizeof(struct amo))); + + /* fake the sending and receipt of an activate IRQ from remote nasid */ + FETCHOP_STORE_OP(TO_AMO((u64)&amos[BIT_WORD(from_nasid / 2)].variable), + FETCHOP_OR, BIT_MASK(from_nasid / 2)); + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + xpc_activate_IRQ_rcvd++; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + wake_up_interruptible(&xpc_activate_IRQ_wq); +} + +/* + * Functions associated with SGI_XPC_NOTIFY IRQ. + */ + +/* + * Check to see if any chctl flags were sent from the specified partition. + */ +static void +xpc_check_for_sent_chctl_flags_sn2(struct xpc_partition *part) +{ + union xpc_channel_ctl_flags chctl; + unsigned long irq_flags; + + chctl.all_flags = xpc_receive_IRQ_amo_sn2(part->sn.sn2. + local_chctl_amo_va); + if (chctl.all_flags == 0) + return; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.all_flags |= chctl.all_flags; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + dev_dbg(xpc_chan, "received notify IRQ from partid=%d, chctl.all_flags=" + "0x%lx\n", XPC_PARTID(part), chctl.all_flags); + + xpc_wakeup_channel_mgr(part); +} + +/* + * Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified + * partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more + * than one partition, we use an amo structure per partition to indicate + * whether a partition has sent an IRQ or not. If it has, then wake up the + * associated kthread to handle it. + * + * All SGI_XPC_NOTIFY IRQs received by XPC are the result of IRQs sent by XPC + * running on other partitions. + * + * Noteworthy Arguments: + * + * irq - Interrupt ReQuest number. NOT USED. + * + * dev_id - partid of IRQ's potential sender. + */ +static irqreturn_t +xpc_handle_notify_IRQ_sn2(int irq, void *dev_id) +{ + short partid = (short)(u64)dev_id; + struct xpc_partition *part = &xpc_partitions[partid]; + + DBUG_ON(partid < 0 || partid >= XP_MAX_NPARTITIONS_SN2); + + if (xpc_part_ref(part)) { + xpc_check_for_sent_chctl_flags_sn2(part); + + xpc_part_deref(part); + } + return IRQ_HANDLED; +} + +/* + * Check to see if xpc_handle_notify_IRQ_sn2() dropped any IRQs on the floor + * because the write to their associated amo variable completed after the IRQ + * was received. + */ +static void +xpc_check_for_dropped_notify_IRQ_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + + if (xpc_part_ref(part)) { + xpc_check_for_sent_chctl_flags_sn2(part); + + part_sn2->dropped_notify_IRQ_timer.expires = jiffies + + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL; + add_timer(&part_sn2->dropped_notify_IRQ_timer); + xpc_part_deref(part); + } +} + +/* + * Send a notify IRQ to the remote partition that is associated with the + * specified channel. + */ +static void +xpc_send_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag, + char *chctl_flag_string, unsigned long *irq_flags) +{ + struct xpc_partition *part = &xpc_partitions[ch->partid]; + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + union xpc_channel_ctl_flags chctl = { 0 }; + enum xp_retval ret; + + if (likely(part->act_state != XPC_P_AS_DEACTIVATING)) { + chctl.flags[ch->number] = chctl_flag; + ret = xpc_send_IRQ_sn2(part_sn2->remote_chctl_amo_va, + chctl.all_flags, + part_sn2->notify_IRQ_nasid, + part_sn2->notify_IRQ_phys_cpuid, + SGI_XPC_NOTIFY); + dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", + chctl_flag_string, ch->partid, ch->number, ret); + if (unlikely(ret != xpSuccess)) { + if (irq_flags != NULL) + spin_unlock_irqrestore(&ch->lock, *irq_flags); + XPC_DEACTIVATE_PARTITION(part, ret); + if (irq_flags != NULL) + spin_lock_irqsave(&ch->lock, *irq_flags); + } + } +} + +#define XPC_SEND_NOTIFY_IRQ_SN2(_ch, _ipi_f, _irq_f) \ + xpc_send_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f, _irq_f) + +/* + * Make it look like the remote partition, which is associated with the + * specified channel, sent us a notify IRQ. This faked IRQ will be handled + * by xpc_check_for_dropped_notify_IRQ_sn2(). + */ +static void +xpc_send_local_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag, + char *chctl_flag_string) +{ + struct xpc_partition *part = &xpc_partitions[ch->partid]; + union xpc_channel_ctl_flags chctl = { 0 }; + + chctl.flags[ch->number] = chctl_flag; + FETCHOP_STORE_OP(TO_AMO((u64)&part->sn.sn2.local_chctl_amo_va-> + variable), FETCHOP_OR, chctl.all_flags); + dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", + chctl_flag_string, ch->partid, ch->number); +} + +#define XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(_ch, _ipi_f) \ + xpc_send_local_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f) + +static void +xpc_send_chctl_closerequest_sn2(struct xpc_channel *ch, + unsigned long *irq_flags) +{ + struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args; + + args->reason = ch->reason; + XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREQUEST, irq_flags); +} + +static void +xpc_send_chctl_closereply_sn2(struct xpc_channel *ch, unsigned long *irq_flags) +{ + XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREPLY, irq_flags); +} + +static void +xpc_send_chctl_openrequest_sn2(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args; + + args->entry_size = ch->entry_size; + args->local_nentries = ch->local_nentries; + XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREQUEST, irq_flags); +} + +static void +xpc_send_chctl_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_openclose_args *args = ch->sn.sn2.local_openclose_args; + + args->remote_nentries = ch->remote_nentries; + args->local_nentries = ch->local_nentries; + args->local_msgqueue_pa = xp_pa(ch->sn.sn2.local_msgqueue); + XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREPLY, irq_flags); +} + +static void +xpc_send_chctl_msgrequest_sn2(struct xpc_channel *ch) +{ + XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST, NULL); +} + +static void +xpc_send_chctl_local_msgrequest_sn2(struct xpc_channel *ch) +{ + XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST); +} + +static void +xpc_save_remote_msgqueue_pa_sn2(struct xpc_channel *ch, + unsigned long msgqueue_pa) +{ + ch->sn.sn2.remote_msgqueue_pa = msgqueue_pa; +} + +/* + * This next set of functions are used to keep track of when a partition is + * potentially engaged in accessing memory belonging to another partition. + */ + +static void +xpc_indicate_partition_engaged_sn2(struct xpc_partition *part) +{ + unsigned long irq_flags; + struct amo *amo = (struct amo *)__va(part->sn.sn2.remote_amos_page_pa + + (XPC_ENGAGED_PARTITIONS_AMO_SN2 * + sizeof(struct amo))); + + local_irq_save(irq_flags); + + /* set bit corresponding to our partid in remote partition's amo */ + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, + BIT(sn_partition_id)); + + /* + * We must always use the nofault function regardless of whether we + * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we + * didn't, we'd never know that the other partition is down and would + * keep sending IRQs and amos to it until the heartbeat times out. + */ + (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> + variable), + xp_nofault_PIOR_target)); + + local_irq_restore(irq_flags); +} + +static void +xpc_indicate_partition_disengaged_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + unsigned long irq_flags; + struct amo *amo = (struct amo *)__va(part_sn2->remote_amos_page_pa + + (XPC_ENGAGED_PARTITIONS_AMO_SN2 * + sizeof(struct amo))); + + local_irq_save(irq_flags); + + /* clear bit corresponding to our partid in remote partition's amo */ + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, + ~BIT(sn_partition_id)); + + /* + * We must always use the nofault function regardless of whether we + * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we + * didn't, we'd never know that the other partition is down and would + * keep sending IRQs and amos to it until the heartbeat times out. + */ + (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> + variable), + xp_nofault_PIOR_target)); + + local_irq_restore(irq_flags); + + /* + * Send activate IRQ to get other side to see that we've cleared our + * bit in their engaged partitions amo. + */ + xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa, + cnodeid_to_nasid(0), + part_sn2->activate_IRQ_nasid, + part_sn2->activate_IRQ_phys_cpuid); +} + +static void +xpc_assume_partition_disengaged_sn2(short partid) +{ + struct amo *amo = xpc_vars_sn2->amos_page + + XPC_ENGAGED_PARTITIONS_AMO_SN2; + + /* clear bit(s) based on partid mask in our partition's amo */ + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, + ~BIT(partid)); +} + +static int +xpc_partition_engaged_sn2(short partid) +{ + struct amo *amo = xpc_vars_sn2->amos_page + + XPC_ENGAGED_PARTITIONS_AMO_SN2; + + /* our partition's amo variable ANDed with partid mask */ + return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & + BIT(partid)) != 0; +} + +static int +xpc_any_partition_engaged_sn2(void) +{ + struct amo *amo = xpc_vars_sn2->amos_page + + XPC_ENGAGED_PARTITIONS_AMO_SN2; + + /* our partition's amo variable */ + return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) != 0; +} + +/* original protection values for each node */ +static u64 xpc_prot_vec_sn2[MAX_NUMNODES]; + +/* + * Change protections to allow amo operations on non-Shub 1.1 systems. + */ +static enum xp_retval +xpc_allow_amo_ops_sn2(struct amo *amos_page) +{ + u64 nasid_array = 0; + int ret; + + /* + * On SHUB 1.1, we cannot call sn_change_memprotect() since the BIST + * collides with memory operations. On those systems we call + * xpc_allow_amo_ops_shub_wars_1_1_sn2() instead. + */ + if (!enable_shub_wars_1_1()) { + ret = sn_change_memprotect(ia64_tpa((u64)amos_page), PAGE_SIZE, + SN_MEMPROT_ACCESS_CLASS_1, + &nasid_array); + if (ret != 0) + return xpSalError; + } + return xpSuccess; +} + +/* + * Change protections to allow amo operations on Shub 1.1 systems. + */ +static void +xpc_allow_amo_ops_shub_wars_1_1_sn2(void) +{ + int node; + int nasid; + + if (!enable_shub_wars_1_1()) + return; + + for_each_online_node(node) { + nasid = cnodeid_to_nasid(node); + /* save current protection values */ + xpc_prot_vec_sn2[node] = + (u64)HUB_L((u64 *)GLOBAL_MMR_ADDR(nasid, + SH1_MD_DQLP_MMR_DIR_PRIVEC0)); + /* open up everything */ + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, + SH1_MD_DQLP_MMR_DIR_PRIVEC0), + -1UL); + HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, + SH1_MD_DQRP_MMR_DIR_PRIVEC0), + -1UL); + } +} + +static enum xp_retval +xpc_get_partition_rsvd_page_pa_sn2(void *buf, u64 *cookie, unsigned long *rp_pa, + size_t *len) +{ + s64 status; + enum xp_retval ret; + + status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len); + if (status == SALRET_OK) + ret = xpSuccess; + else if (status == SALRET_MORE_PASSES) + ret = xpNeedMoreInfo; + else + ret = xpSalError; + + return ret; +} + + +static int +xpc_setup_rsvd_page_sn_sn2(struct xpc_rsvd_page *rp) +{ + struct amo *amos_page; + int i; + int ret; + + xpc_vars_sn2 = XPC_RP_VARS(rp); + + rp->sn.vars_pa = xp_pa(xpc_vars_sn2); + + /* vars_part array follows immediately after vars */ + xpc_vars_part_sn2 = (struct xpc_vars_part_sn2 *)((u8 *)XPC_RP_VARS(rp) + + XPC_RP_VARS_SIZE); + + /* + * Before clearing xpc_vars_sn2, see if a page of amos had been + * previously allocated. If not we'll need to allocate one and set + * permissions so that cross-partition amos are allowed. + * + * The allocated amo page needs MCA reporting to remain disabled after + * XPC has unloaded. To make this work, we keep a copy of the pointer + * to this page (i.e., amos_page) in the struct xpc_vars_sn2 structure, + * which is pointed to by the reserved page, and re-use that saved copy + * on subsequent loads of XPC. This amo page is never freed, and its + * memory protections are never restricted. + */ + amos_page = xpc_vars_sn2->amos_page; + if (amos_page == NULL) { + amos_page = (struct amo *)TO_AMO(uncached_alloc_page(0, 1)); + if (amos_page == NULL) { + dev_err(xpc_part, "can't allocate page of amos\n"); + return -ENOMEM; + } + + /* + * Open up amo-R/W to cpu. This is done on Shub 1.1 systems + * when xpc_allow_amo_ops_shub_wars_1_1_sn2() is called. + */ + ret = xpc_allow_amo_ops_sn2(amos_page); + if (ret != xpSuccess) { + dev_err(xpc_part, "can't allow amo operations\n"); + uncached_free_page(__IA64_UNCACHED_OFFSET | + TO_PHYS((u64)amos_page), 1); + return -EPERM; + } + } + + /* clear xpc_vars_sn2 */ + memset(xpc_vars_sn2, 0, sizeof(struct xpc_vars_sn2)); + + xpc_vars_sn2->version = XPC_V_VERSION; + xpc_vars_sn2->activate_IRQ_nasid = cpuid_to_nasid(0); + xpc_vars_sn2->activate_IRQ_phys_cpuid = cpu_physical_id(0); + xpc_vars_sn2->vars_part_pa = xp_pa(xpc_vars_part_sn2); + xpc_vars_sn2->amos_page_pa = ia64_tpa((u64)amos_page); + xpc_vars_sn2->amos_page = amos_page; /* save for next load of XPC */ + + /* clear xpc_vars_part_sn2 */ + memset((u64 *)xpc_vars_part_sn2, 0, sizeof(struct xpc_vars_part_sn2) * + XP_MAX_NPARTITIONS_SN2); + + /* initialize the activate IRQ related amo variables */ + for (i = 0; i < xpc_nasid_mask_nlongs; i++) + (void)xpc_init_IRQ_amo_sn2(XPC_ACTIVATE_IRQ_AMOS_SN2 + i); + + /* initialize the engaged remote partitions related amo variables */ + (void)xpc_init_IRQ_amo_sn2(XPC_ENGAGED_PARTITIONS_AMO_SN2); + (void)xpc_init_IRQ_amo_sn2(XPC_DEACTIVATE_REQUEST_AMO_SN2); + + return 0; +} + +static void +xpc_increment_heartbeat_sn2(void) +{ + xpc_vars_sn2->heartbeat++; +} + +static void +xpc_offline_heartbeat_sn2(void) +{ + xpc_increment_heartbeat_sn2(); + xpc_vars_sn2->heartbeat_offline = 1; +} + +static void +xpc_online_heartbeat_sn2(void) +{ + xpc_increment_heartbeat_sn2(); + xpc_vars_sn2->heartbeat_offline = 0; +} + +static void +xpc_heartbeat_init_sn2(void) +{ + DBUG_ON(xpc_vars_sn2 == NULL); + + bitmap_zero(xpc_vars_sn2->heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2); + xpc_heartbeating_to_mask = &xpc_vars_sn2->heartbeating_to_mask[0]; + xpc_online_heartbeat_sn2(); +} + +static void +xpc_heartbeat_exit_sn2(void) +{ + xpc_offline_heartbeat_sn2(); +} + +static enum xp_retval +xpc_get_remote_heartbeat_sn2(struct xpc_partition *part) +{ + struct xpc_vars_sn2 *remote_vars; + enum xp_retval ret; + + remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer_sn2; + + /* pull the remote vars structure that contains the heartbeat */ + ret = xp_remote_memcpy(xp_pa(remote_vars), + part->sn.sn2.remote_vars_pa, + XPC_RP_VARS_SIZE); + if (ret != xpSuccess) + return ret; + + dev_dbg(xpc_part, "partid=%d, heartbeat=%ld, last_heartbeat=%ld, " + "heartbeat_offline=%ld, HB_mask[0]=0x%lx\n", XPC_PARTID(part), + remote_vars->heartbeat, part->last_heartbeat, + remote_vars->heartbeat_offline, + remote_vars->heartbeating_to_mask[0]); + + if ((remote_vars->heartbeat == part->last_heartbeat && + remote_vars->heartbeat_offline == 0) || + !xpc_hb_allowed(sn_partition_id, + &remote_vars->heartbeating_to_mask)) { + ret = xpNoHeartbeat; + } else { + part->last_heartbeat = remote_vars->heartbeat; + } + + return ret; +} + +/* + * Get a copy of the remote partition's XPC variables from the reserved page. + * + * remote_vars points to a buffer that is cacheline aligned for BTE copies and + * assumed to be of size XPC_RP_VARS_SIZE. + */ +static enum xp_retval +xpc_get_remote_vars_sn2(unsigned long remote_vars_pa, + struct xpc_vars_sn2 *remote_vars) +{ + enum xp_retval ret; + + if (remote_vars_pa == 0) + return xpVarsNotSet; + + /* pull over the cross partition variables */ + ret = xp_remote_memcpy(xp_pa(remote_vars), remote_vars_pa, + XPC_RP_VARS_SIZE); + if (ret != xpSuccess) + return ret; + + if (XPC_VERSION_MAJOR(remote_vars->version) != + XPC_VERSION_MAJOR(XPC_V_VERSION)) { + return xpBadVersion; + } + + return xpSuccess; +} + +static void +xpc_request_partition_activation_sn2(struct xpc_rsvd_page *remote_rp, + unsigned long remote_rp_pa, int nasid) +{ + xpc_send_local_activate_IRQ_sn2(nasid); +} + +static void +xpc_request_partition_reactivation_sn2(struct xpc_partition *part) +{ + xpc_send_local_activate_IRQ_sn2(part->sn.sn2.activate_IRQ_nasid); +} + +static void +xpc_request_partition_deactivation_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + unsigned long irq_flags; + struct amo *amo = (struct amo *)__va(part_sn2->remote_amos_page_pa + + (XPC_DEACTIVATE_REQUEST_AMO_SN2 * + sizeof(struct amo))); + + local_irq_save(irq_flags); + + /* set bit corresponding to our partid in remote partition's amo */ + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, + BIT(sn_partition_id)); + + /* + * We must always use the nofault function regardless of whether we + * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we + * didn't, we'd never know that the other partition is down and would + * keep sending IRQs and amos to it until the heartbeat times out. + */ + (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> + variable), + xp_nofault_PIOR_target)); + + local_irq_restore(irq_flags); + + /* + * Send activate IRQ to get other side to see that we've set our + * bit in their deactivate request amo. + */ + xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa, + cnodeid_to_nasid(0), + part_sn2->activate_IRQ_nasid, + part_sn2->activate_IRQ_phys_cpuid); +} + +static void +xpc_cancel_partition_deactivation_request_sn2(struct xpc_partition *part) +{ + unsigned long irq_flags; + struct amo *amo = (struct amo *)__va(part->sn.sn2.remote_amos_page_pa + + (XPC_DEACTIVATE_REQUEST_AMO_SN2 * + sizeof(struct amo))); + + local_irq_save(irq_flags); + + /* clear bit corresponding to our partid in remote partition's amo */ + FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, + ~BIT(sn_partition_id)); + + /* + * We must always use the nofault function regardless of whether we + * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we + * didn't, we'd never know that the other partition is down and would + * keep sending IRQs and amos to it until the heartbeat times out. + */ + (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> + variable), + xp_nofault_PIOR_target)); + + local_irq_restore(irq_flags); +} + +static int +xpc_partition_deactivation_requested_sn2(short partid) +{ + struct amo *amo = xpc_vars_sn2->amos_page + + XPC_DEACTIVATE_REQUEST_AMO_SN2; + + /* our partition's amo variable ANDed with partid mask */ + return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & + BIT(partid)) != 0; +} + +/* + * Update the remote partition's info. + */ +static void +xpc_update_partition_info_sn2(struct xpc_partition *part, u8 remote_rp_version, + unsigned long *remote_rp_ts_jiffies, + unsigned long remote_rp_pa, + unsigned long remote_vars_pa, + struct xpc_vars_sn2 *remote_vars) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + + part->remote_rp_version = remote_rp_version; + dev_dbg(xpc_part, " remote_rp_version = 0x%016x\n", + part->remote_rp_version); + + part->remote_rp_ts_jiffies = *remote_rp_ts_jiffies; + dev_dbg(xpc_part, " remote_rp_ts_jiffies = 0x%016lx\n", + part->remote_rp_ts_jiffies); + + part->remote_rp_pa = remote_rp_pa; + dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n", part->remote_rp_pa); + + part_sn2->remote_vars_pa = remote_vars_pa; + dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n", + part_sn2->remote_vars_pa); + + part->last_heartbeat = remote_vars->heartbeat; + dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n", + part->last_heartbeat); + + part_sn2->remote_vars_part_pa = remote_vars->vars_part_pa; + dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n", + part_sn2->remote_vars_part_pa); + + part_sn2->activate_IRQ_nasid = remote_vars->activate_IRQ_nasid; + dev_dbg(xpc_part, " activate_IRQ_nasid = 0x%x\n", + part_sn2->activate_IRQ_nasid); + + part_sn2->activate_IRQ_phys_cpuid = + remote_vars->activate_IRQ_phys_cpuid; + dev_dbg(xpc_part, " activate_IRQ_phys_cpuid = 0x%x\n", + part_sn2->activate_IRQ_phys_cpuid); + + part_sn2->remote_amos_page_pa = remote_vars->amos_page_pa; + dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n", + part_sn2->remote_amos_page_pa); + + part_sn2->remote_vars_version = remote_vars->version; + dev_dbg(xpc_part, " remote_vars_version = 0x%x\n", + part_sn2->remote_vars_version); +} + +/* + * Prior code has determined the nasid which generated a activate IRQ. + * Inspect that nasid to determine if its partition needs to be activated + * or deactivated. + * + * A partition is considered "awaiting activation" if our partition + * flags indicate it is not active and it has a heartbeat. A + * partition is considered "awaiting deactivation" if our partition + * flags indicate it is active but it has no heartbeat or it is not + * sending its heartbeat to us. + * + * To determine the heartbeat, the remote nasid must have a properly + * initialized reserved page. + */ +static void +xpc_identify_activate_IRQ_req_sn2(int nasid) +{ + struct xpc_rsvd_page *remote_rp; + struct xpc_vars_sn2 *remote_vars; + unsigned long remote_rp_pa; + unsigned long remote_vars_pa; + int remote_rp_version; + int reactivate = 0; + unsigned long remote_rp_ts_jiffies = 0; + short partid; + struct xpc_partition *part; + struct xpc_partition_sn2 *part_sn2; + enum xp_retval ret; + + /* pull over the reserved page structure */ + + remote_rp = (struct xpc_rsvd_page *)xpc_remote_copy_buffer_sn2; + + ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa); + if (ret != xpSuccess) { + dev_warn(xpc_part, "unable to get reserved page from nasid %d, " + "which sent interrupt, reason=%d\n", nasid, ret); + return; + } + + remote_vars_pa = remote_rp->sn.vars_pa; + remote_rp_version = remote_rp->version; + remote_rp_ts_jiffies = remote_rp->ts_jiffies; + + partid = remote_rp->SAL_partid; + part = &xpc_partitions[partid]; + part_sn2 = &part->sn.sn2; + + /* pull over the cross partition variables */ + + remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer_sn2; + + ret = xpc_get_remote_vars_sn2(remote_vars_pa, remote_vars); + if (ret != xpSuccess) { + dev_warn(xpc_part, "unable to get XPC variables from nasid %d, " + "which sent interrupt, reason=%d\n", nasid, ret); + + XPC_DEACTIVATE_PARTITION(part, ret); + return; + } + + part->activate_IRQ_rcvd++; + + dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = " + "%ld:0x%lx\n", (int)nasid, (int)partid, part->activate_IRQ_rcvd, + remote_vars->heartbeat, remote_vars->heartbeating_to_mask[0]); + + if (xpc_partition_disengaged(part) && + part->act_state == XPC_P_AS_INACTIVE) { + + xpc_update_partition_info_sn2(part, remote_rp_version, + &remote_rp_ts_jiffies, + remote_rp_pa, remote_vars_pa, + remote_vars); + + if (xpc_partition_deactivation_requested_sn2(partid)) { + /* + * Other side is waiting on us to deactivate even though + * we already have. + */ + return; + } + + xpc_activate_partition(part); + return; + } + + DBUG_ON(part->remote_rp_version == 0); + DBUG_ON(part_sn2->remote_vars_version == 0); + + if (remote_rp_ts_jiffies != part->remote_rp_ts_jiffies) { + + /* the other side rebooted */ + + DBUG_ON(xpc_partition_engaged_sn2(partid)); + DBUG_ON(xpc_partition_deactivation_requested_sn2(partid)); + + xpc_update_partition_info_sn2(part, remote_rp_version, + &remote_rp_ts_jiffies, + remote_rp_pa, remote_vars_pa, + remote_vars); + reactivate = 1; + } + + if (part->disengage_timeout > 0 && !xpc_partition_disengaged(part)) { + /* still waiting on other side to disengage from us */ + return; + } + + if (reactivate) + XPC_DEACTIVATE_PARTITION(part, xpReactivating); + else if (xpc_partition_deactivation_requested_sn2(partid)) + XPC_DEACTIVATE_PARTITION(part, xpOtherGoingDown); +} + +/* + * Loop through the activation amo variables and process any bits + * which are set. Each bit indicates a nasid sending a partition + * activation or deactivation request. + * + * Return #of IRQs detected. + */ +int +xpc_identify_activate_IRQ_sender_sn2(void) +{ + int l; + int b; + unsigned long nasid_mask_long; + u64 nasid; /* remote nasid */ + int n_IRQs_detected = 0; + struct amo *act_amos; + + act_amos = xpc_vars_sn2->amos_page + XPC_ACTIVATE_IRQ_AMOS_SN2; + + /* scan through activate amo variables looking for non-zero entries */ + for (l = 0; l < xpc_nasid_mask_nlongs; l++) { + + if (xpc_exiting) + break; + + nasid_mask_long = xpc_receive_IRQ_amo_sn2(&act_amos[l]); + + b = find_first_bit(&nasid_mask_long, BITS_PER_LONG); + if (b >= BITS_PER_LONG) { + /* no IRQs from nasids in this amo variable */ + continue; + } + + dev_dbg(xpc_part, "amo[%d] gave back 0x%lx\n", l, + nasid_mask_long); + + /* + * If this nasid has been added to the machine since + * our partition was reset, this will retain the + * remote nasid in our reserved pages machine mask. + * This is used in the event of module reload. + */ + xpc_mach_nasids[l] |= nasid_mask_long; + + /* locate the nasid(s) which sent interrupts */ + + do { + n_IRQs_detected++; + nasid = (l * BITS_PER_LONG + b) * 2; + dev_dbg(xpc_part, "interrupt from nasid %ld\n", nasid); + xpc_identify_activate_IRQ_req_sn2(nasid); + + b = find_next_bit(&nasid_mask_long, BITS_PER_LONG, + b + 1); + } while (b < BITS_PER_LONG); + } + return n_IRQs_detected; +} + +static void +xpc_process_activate_IRQ_rcvd_sn2(void) +{ + unsigned long irq_flags; + int n_IRQs_expected; + int n_IRQs_detected; + + DBUG_ON(xpc_activate_IRQ_rcvd == 0); + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + n_IRQs_expected = xpc_activate_IRQ_rcvd; + xpc_activate_IRQ_rcvd = 0; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + n_IRQs_detected = xpc_identify_activate_IRQ_sender_sn2(); + if (n_IRQs_detected < n_IRQs_expected) { + /* retry once to help avoid missing amo */ + (void)xpc_identify_activate_IRQ_sender_sn2(); + } +} + +/* + * Setup the channel structures that are sn2 specific. + */ +static enum xp_retval +xpc_setup_ch_structures_sn_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + struct xpc_channel_sn2 *ch_sn2; + enum xp_retval retval; + int ret; + int cpuid; + int ch_number; + struct timer_list *timer; + short partid = XPC_PARTID(part); + + /* allocate all the required GET/PUT values */ + + part_sn2->local_GPs = + xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, GFP_KERNEL, + &part_sn2->local_GPs_base); + if (part_sn2->local_GPs == NULL) { + dev_err(xpc_chan, "can't get memory for local get/put " + "values\n"); + return xpNoMemory; + } + + part_sn2->remote_GPs = + xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE, GFP_KERNEL, + &part_sn2->remote_GPs_base); + if (part_sn2->remote_GPs == NULL) { + dev_err(xpc_chan, "can't get memory for remote get/put " + "values\n"); + retval = xpNoMemory; + goto out_1; + } + + part_sn2->remote_GPs_pa = 0; + + /* allocate all the required open and close args */ + + part_sn2->local_openclose_args = + xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, + GFP_KERNEL, &part_sn2-> + local_openclose_args_base); + if (part_sn2->local_openclose_args == NULL) { + dev_err(xpc_chan, "can't get memory for local connect args\n"); + retval = xpNoMemory; + goto out_2; + } + + part_sn2->remote_openclose_args_pa = 0; + + part_sn2->local_chctl_amo_va = xpc_init_IRQ_amo_sn2(partid); + + part_sn2->notify_IRQ_nasid = 0; + part_sn2->notify_IRQ_phys_cpuid = 0; + part_sn2->remote_chctl_amo_va = NULL; + + sprintf(part_sn2->notify_IRQ_owner, "xpc%02d", partid); + ret = request_irq(SGI_XPC_NOTIFY, xpc_handle_notify_IRQ_sn2, + IRQF_SHARED, part_sn2->notify_IRQ_owner, + (void *)(u64)partid); + if (ret != 0) { + dev_err(xpc_chan, "can't register NOTIFY IRQ handler, " + "errno=%d\n", -ret); + retval = xpLackOfResources; + goto out_3; + } + + /* Setup a timer to check for dropped notify IRQs */ + timer = &part_sn2->dropped_notify_IRQ_timer; + init_timer(timer); + timer->function = + (void (*)(unsigned long))xpc_check_for_dropped_notify_IRQ_sn2; + timer->data = (unsigned long)part; + timer->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL; + add_timer(timer); + + for (ch_number = 0; ch_number < part->nchannels; ch_number++) { + ch_sn2 = &part->channels[ch_number].sn.sn2; + + ch_sn2->local_GP = &part_sn2->local_GPs[ch_number]; + ch_sn2->local_openclose_args = + &part_sn2->local_openclose_args[ch_number]; + + mutex_init(&ch_sn2->msg_to_pull_mutex); + } + + /* + * Setup the per partition specific variables required by the + * remote partition to establish channel connections with us. + * + * The setting of the magic # indicates that these per partition + * specific variables are ready to be used. + */ + xpc_vars_part_sn2[partid].GPs_pa = xp_pa(part_sn2->local_GPs); + xpc_vars_part_sn2[partid].openclose_args_pa = + xp_pa(part_sn2->local_openclose_args); + xpc_vars_part_sn2[partid].chctl_amo_pa = + xp_pa(part_sn2->local_chctl_amo_va); + cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */ + xpc_vars_part_sn2[partid].notify_IRQ_nasid = cpuid_to_nasid(cpuid); + xpc_vars_part_sn2[partid].notify_IRQ_phys_cpuid = + cpu_physical_id(cpuid); + xpc_vars_part_sn2[partid].nchannels = part->nchannels; + xpc_vars_part_sn2[partid].magic = XPC_VP_MAGIC1_SN2; + + return xpSuccess; + + /* setup of ch structures failed */ +out_3: + kfree(part_sn2->local_openclose_args_base); + part_sn2->local_openclose_args = NULL; +out_2: + kfree(part_sn2->remote_GPs_base); + part_sn2->remote_GPs = NULL; +out_1: + kfree(part_sn2->local_GPs_base); + part_sn2->local_GPs = NULL; + return retval; +} + +/* + * Teardown the channel structures that are sn2 specific. + */ +static void +xpc_teardown_ch_structures_sn_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + short partid = XPC_PARTID(part); + + /* + * Indicate that the variables specific to the remote partition are no + * longer available for its use. + */ + xpc_vars_part_sn2[partid].magic = 0; + + /* in case we've still got outstanding timers registered... */ + del_timer_sync(&part_sn2->dropped_notify_IRQ_timer); + free_irq(SGI_XPC_NOTIFY, (void *)(u64)partid); + + kfree(part_sn2->local_openclose_args_base); + part_sn2->local_openclose_args = NULL; + kfree(part_sn2->remote_GPs_base); + part_sn2->remote_GPs = NULL; + kfree(part_sn2->local_GPs_base); + part_sn2->local_GPs = NULL; + part_sn2->local_chctl_amo_va = NULL; +} + +/* + * Create a wrapper that hides the underlying mechanism for pulling a cacheline + * (or multiple cachelines) from a remote partition. + * + * src_pa must be a cacheline aligned physical address on the remote partition. + * dst must be a cacheline aligned virtual address on this partition. + * cnt must be cacheline sized + */ +/* ??? Replace this function by call to xp_remote_memcpy() or bte_copy()? */ +static enum xp_retval +xpc_pull_remote_cachelines_sn2(struct xpc_partition *part, void *dst, + const unsigned long src_pa, size_t cnt) +{ + enum xp_retval ret; + + DBUG_ON(src_pa != L1_CACHE_ALIGN(src_pa)); + DBUG_ON((unsigned long)dst != L1_CACHE_ALIGN((unsigned long)dst)); + DBUG_ON(cnt != L1_CACHE_ALIGN(cnt)); + + if (part->act_state == XPC_P_AS_DEACTIVATING) + return part->reason; + + ret = xp_remote_memcpy(xp_pa(dst), src_pa, cnt); + if (ret != xpSuccess) { + dev_dbg(xpc_chan, "xp_remote_memcpy() from partition %d failed," + " ret=%d\n", XPC_PARTID(part), ret); + } + return ret; +} + +/* + * Pull the remote per partition specific variables from the specified + * partition. + */ +static enum xp_retval +xpc_pull_remote_vars_part_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + u8 buffer[L1_CACHE_BYTES * 2]; + struct xpc_vars_part_sn2 *pulled_entry_cacheline = + (struct xpc_vars_part_sn2 *)L1_CACHE_ALIGN((u64)buffer); + struct xpc_vars_part_sn2 *pulled_entry; + unsigned long remote_entry_cacheline_pa; + unsigned long remote_entry_pa; + short partid = XPC_PARTID(part); + enum xp_retval ret; + + /* pull the cacheline that contains the variables we're interested in */ + + DBUG_ON(part_sn2->remote_vars_part_pa != + L1_CACHE_ALIGN(part_sn2->remote_vars_part_pa)); + DBUG_ON(sizeof(struct xpc_vars_part_sn2) != L1_CACHE_BYTES / 2); + + remote_entry_pa = part_sn2->remote_vars_part_pa + + sn_partition_id * sizeof(struct xpc_vars_part_sn2); + + remote_entry_cacheline_pa = (remote_entry_pa & ~(L1_CACHE_BYTES - 1)); + + pulled_entry = (struct xpc_vars_part_sn2 *)((u64)pulled_entry_cacheline + + (remote_entry_pa & + (L1_CACHE_BYTES - 1))); + + ret = xpc_pull_remote_cachelines_sn2(part, pulled_entry_cacheline, + remote_entry_cacheline_pa, + L1_CACHE_BYTES); + if (ret != xpSuccess) { + dev_dbg(xpc_chan, "failed to pull XPC vars_part from " + "partition %d, ret=%d\n", partid, ret); + return ret; + } + + /* see if they've been set up yet */ + + if (pulled_entry->magic != XPC_VP_MAGIC1_SN2 && + pulled_entry->magic != XPC_VP_MAGIC2_SN2) { + + if (pulled_entry->magic != 0) { + dev_dbg(xpc_chan, "partition %d's XPC vars_part for " + "partition %d has bad magic value (=0x%lx)\n", + partid, sn_partition_id, pulled_entry->magic); + return xpBadMagic; + } + + /* they've not been initialized yet */ + return xpRetry; + } + + if (xpc_vars_part_sn2[partid].magic == XPC_VP_MAGIC1_SN2) { + + /* validate the variables */ + + if (pulled_entry->GPs_pa == 0 || + pulled_entry->openclose_args_pa == 0 || + pulled_entry->chctl_amo_pa == 0) { + + dev_err(xpc_chan, "partition %d's XPC vars_part for " + "partition %d are not valid\n", partid, + sn_partition_id); + return xpInvalidAddress; + } + + /* the variables we imported look to be valid */ + + part_sn2->remote_GPs_pa = pulled_entry->GPs_pa; + part_sn2->remote_openclose_args_pa = + pulled_entry->openclose_args_pa; + part_sn2->remote_chctl_amo_va = + (struct amo *)__va(pulled_entry->chctl_amo_pa); + part_sn2->notify_IRQ_nasid = pulled_entry->notify_IRQ_nasid; + part_sn2->notify_IRQ_phys_cpuid = + pulled_entry->notify_IRQ_phys_cpuid; + + if (part->nchannels > pulled_entry->nchannels) + part->nchannels = pulled_entry->nchannels; + + /* let the other side know that we've pulled their variables */ + + xpc_vars_part_sn2[partid].magic = XPC_VP_MAGIC2_SN2; + } + + if (pulled_entry->magic == XPC_VP_MAGIC1_SN2) + return xpRetry; + + return xpSuccess; +} + +/* + * Establish first contact with the remote partititon. This involves pulling + * the XPC per partition variables from the remote partition and waiting for + * the remote partition to pull ours. + */ +static enum xp_retval +xpc_make_first_contact_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + enum xp_retval ret; + + /* + * Register the remote partition's amos with SAL so it can handle + * and cleanup errors within that address range should the remote + * partition go down. We don't unregister this range because it is + * difficult to tell when outstanding writes to the remote partition + * are finished and thus when it is safe to unregister. This should + * not result in wasted space in the SAL xp_addr_region table because + * we should get the same page for remote_amos_page_pa after module + * reloads and system reboots. + */ + if (sn_register_xp_addr_region(part_sn2->remote_amos_page_pa, + PAGE_SIZE, 1) < 0) { + dev_warn(xpc_part, "xpc_activating(%d) failed to register " + "xp_addr region\n", XPC_PARTID(part)); + + ret = xpPhysAddrRegFailed; + XPC_DEACTIVATE_PARTITION(part, ret); + return ret; + } + + /* + * Send activate IRQ to get other side to activate if they've not + * already begun to do so. + */ + xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa, + cnodeid_to_nasid(0), + part_sn2->activate_IRQ_nasid, + part_sn2->activate_IRQ_phys_cpuid); + + while ((ret = xpc_pull_remote_vars_part_sn2(part)) != xpSuccess) { + if (ret != xpRetry) { + XPC_DEACTIVATE_PARTITION(part, ret); + return ret; + } + + dev_dbg(xpc_part, "waiting to make first contact with " + "partition %d\n", XPC_PARTID(part)); + + /* wait a 1/4 of a second or so */ + (void)msleep_interruptible(250); + + if (part->act_state == XPC_P_AS_DEACTIVATING) + return part->reason; + } + + return xpSuccess; +} + +/* + * Get the chctl flags and pull the openclose args and/or remote GPs as needed. + */ +static u64 +xpc_get_chctl_all_flags_sn2(struct xpc_partition *part) +{ + struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2; + unsigned long irq_flags; + union xpc_channel_ctl_flags chctl; + enum xp_retval ret; + + /* + * See if there are any chctl flags to be handled. + */ + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + chctl = part->chctl; + if (chctl.all_flags != 0) + part->chctl.all_flags = 0; + + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + if (xpc_any_openclose_chctl_flags_set(&chctl)) { + ret = xpc_pull_remote_cachelines_sn2(part, part-> + remote_openclose_args, + part_sn2-> + remote_openclose_args_pa, + XPC_OPENCLOSE_ARGS_SIZE); + if (ret != xpSuccess) { + XPC_DEACTIVATE_PARTITION(part, ret); + + dev_dbg(xpc_chan, "failed to pull openclose args from " + "partition %d, ret=%d\n", XPC_PARTID(part), + ret); + + /* don't bother processing chctl flags anymore */ + chctl.all_flags = 0; + } + } + + if (xpc_any_msg_chctl_flags_set(&chctl)) { + ret = xpc_pull_remote_cachelines_sn2(part, part_sn2->remote_GPs, + part_sn2->remote_GPs_pa, + XPC_GP_SIZE); + if (ret != xpSuccess) { + XPC_DEACTIVATE_PARTITION(part, ret); + + dev_dbg(xpc_chan, "failed to pull GPs from partition " + "%d, ret=%d\n", XPC_PARTID(part), ret); + + /* don't bother processing chctl flags anymore */ + chctl.all_flags = 0; + } + } + + return chctl.all_flags; +} + +/* + * Allocate the local message queue and the notify queue. + */ +static enum xp_retval +xpc_allocate_local_msgqueue_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + unsigned long irq_flags; + int nentries; + size_t nbytes; + + for (nentries = ch->local_nentries; nentries > 0; nentries--) { + + nbytes = nentries * ch->entry_size; + ch_sn2->local_msgqueue = + xpc_kzalloc_cacheline_aligned(nbytes, GFP_KERNEL, + &ch_sn2->local_msgqueue_base); + if (ch_sn2->local_msgqueue == NULL) + continue; + + nbytes = nentries * sizeof(struct xpc_notify_sn2); + ch_sn2->notify_queue = kzalloc(nbytes, GFP_KERNEL); + if (ch_sn2->notify_queue == NULL) { + kfree(ch_sn2->local_msgqueue_base); + ch_sn2->local_msgqueue = NULL; + continue; + } + + spin_lock_irqsave(&ch->lock, irq_flags); + if (nentries < ch->local_nentries) { + dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, " + "partid=%d, channel=%d\n", nentries, + ch->local_nentries, ch->partid, ch->number); + + ch->local_nentries = nentries; + } + spin_unlock_irqrestore(&ch->lock, irq_flags); + return xpSuccess; + } + + dev_dbg(xpc_chan, "can't get memory for local message queue and notify " + "queue, partid=%d, channel=%d\n", ch->partid, ch->number); + return xpNoMemory; +} + +/* + * Allocate the cached remote message queue. + */ +static enum xp_retval +xpc_allocate_remote_msgqueue_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + unsigned long irq_flags; + int nentries; + size_t nbytes; + + DBUG_ON(ch->remote_nentries <= 0); + + for (nentries = ch->remote_nentries; nentries > 0; nentries--) { + + nbytes = nentries * ch->entry_size; + ch_sn2->remote_msgqueue = + xpc_kzalloc_cacheline_aligned(nbytes, GFP_KERNEL, &ch_sn2-> + remote_msgqueue_base); + if (ch_sn2->remote_msgqueue == NULL) + continue; + + spin_lock_irqsave(&ch->lock, irq_flags); + if (nentries < ch->remote_nentries) { + dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, " + "partid=%d, channel=%d\n", nentries, + ch->remote_nentries, ch->partid, ch->number); + + ch->remote_nentries = nentries; + } + spin_unlock_irqrestore(&ch->lock, irq_flags); + return xpSuccess; + } + + dev_dbg(xpc_chan, "can't get memory for cached remote message queue, " + "partid=%d, channel=%d\n", ch->partid, ch->number); + return xpNoMemory; +} + +/* + * Allocate message queues and other stuff associated with a channel. + * + * Note: Assumes all of the channel sizes are filled in. + */ +static enum xp_retval +xpc_setup_msg_structures_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + enum xp_retval ret; + + DBUG_ON(ch->flags & XPC_C_SETUP); + + ret = xpc_allocate_local_msgqueue_sn2(ch); + if (ret == xpSuccess) { + + ret = xpc_allocate_remote_msgqueue_sn2(ch); + if (ret != xpSuccess) { + kfree(ch_sn2->local_msgqueue_base); + ch_sn2->local_msgqueue = NULL; + kfree(ch_sn2->notify_queue); + ch_sn2->notify_queue = NULL; + } + } + return ret; +} + +/* + * Free up message queues and other stuff that were allocated for the specified + * channel. + */ +static void +xpc_teardown_msg_structures_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + + DBUG_ON(!spin_is_locked(&ch->lock)); + + ch_sn2->remote_msgqueue_pa = 0; + + ch_sn2->local_GP->get = 0; + ch_sn2->local_GP->put = 0; + ch_sn2->remote_GP.get = 0; + ch_sn2->remote_GP.put = 0; + ch_sn2->w_local_GP.get = 0; + ch_sn2->w_local_GP.put = 0; + ch_sn2->w_remote_GP.get = 0; + ch_sn2->w_remote_GP.put = 0; + ch_sn2->next_msg_to_pull = 0; + + if (ch->flags & XPC_C_SETUP) { + dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n", + ch->flags, ch->partid, ch->number); + + kfree(ch_sn2->local_msgqueue_base); + ch_sn2->local_msgqueue = NULL; + kfree(ch_sn2->remote_msgqueue_base); + ch_sn2->remote_msgqueue = NULL; + kfree(ch_sn2->notify_queue); + ch_sn2->notify_queue = NULL; + } +} + +/* + * Notify those who wanted to be notified upon delivery of their message. + */ +static void +xpc_notify_senders_sn2(struct xpc_channel *ch, enum xp_retval reason, s64 put) +{ + struct xpc_notify_sn2 *notify; + u8 notify_type; + s64 get = ch->sn.sn2.w_remote_GP.get - 1; + + while (++get < put && atomic_read(&ch->n_to_notify) > 0) { + + notify = &ch->sn.sn2.notify_queue[get % ch->local_nentries]; + + /* + * See if the notify entry indicates it was associated with + * a message who's sender wants to be notified. It is possible + * that it is, but someone else is doing or has done the + * notification. + */ + notify_type = notify->type; + if (notify_type == 0 || + cmpxchg(¬ify->type, notify_type, 0) != notify_type) { + continue; + } + + DBUG_ON(notify_type != XPC_N_CALL); + + atomic_dec(&ch->n_to_notify); + + if (notify->func != NULL) { + dev_dbg(xpc_chan, "notify->func() called, notify=0x%p " + "msg_number=%ld partid=%d channel=%d\n", + (void *)notify, get, ch->partid, ch->number); + + notify->func(reason, ch->partid, ch->number, + notify->key); + + dev_dbg(xpc_chan, "notify->func() returned, notify=0x%p" + " msg_number=%ld partid=%d channel=%d\n", + (void *)notify, get, ch->partid, ch->number); + } + } +} + +static void +xpc_notify_senders_of_disconnect_sn2(struct xpc_channel *ch) +{ + xpc_notify_senders_sn2(ch, ch->reason, ch->sn.sn2.w_local_GP.put); +} + +/* + * Clear some of the msg flags in the local message queue. + */ +static inline void +xpc_clear_local_msgqueue_flags_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + s64 get; + + get = ch_sn2->w_remote_GP.get; + do { + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->local_msgqueue + + (get % ch->local_nentries) * + ch->entry_size); + msg->flags = 0; + } while (++get < ch_sn2->remote_GP.get); +} + +/* + * Clear some of the msg flags in the remote message queue. + */ +static inline void +xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + s64 put; + + put = ch_sn2->w_remote_GP.put; + do { + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue + + (put % ch->remote_nentries) * + ch->entry_size); + msg->flags = 0; + } while (++put < ch_sn2->remote_GP.put); +} + +static int +xpc_n_of_deliverable_payloads_sn2(struct xpc_channel *ch) +{ + return ch->sn.sn2.w_remote_GP.put - ch->sn.sn2.w_local_GP.get; +} + +static void +xpc_process_msg_chctl_flags_sn2(struct xpc_partition *part, int ch_number) +{ + struct xpc_channel *ch = &part->channels[ch_number]; + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + int npayloads_sent; + + ch_sn2->remote_GP = part->sn.sn2.remote_GPs[ch_number]; + + /* See what, if anything, has changed for each connected channel */ + + xpc_msgqueue_ref(ch); + + if (ch_sn2->w_remote_GP.get == ch_sn2->remote_GP.get && + ch_sn2->w_remote_GP.put == ch_sn2->remote_GP.put) { + /* nothing changed since GPs were last pulled */ + xpc_msgqueue_deref(ch); + return; + } + + if (!(ch->flags & XPC_C_CONNECTED)) { + xpc_msgqueue_deref(ch); + return; + } + + /* + * First check to see if messages recently sent by us have been + * received by the other side. (The remote GET value will have + * changed since we last looked at it.) + */ + + if (ch_sn2->w_remote_GP.get != ch_sn2->remote_GP.get) { + + /* + * We need to notify any senders that want to be notified + * that their sent messages have been received by their + * intended recipients. We need to do this before updating + * w_remote_GP.get so that we don't allocate the same message + * queue entries prematurely (see xpc_allocate_msg()). + */ + if (atomic_read(&ch->n_to_notify) > 0) { + /* + * Notify senders that messages sent have been + * received and delivered by the other side. + */ + xpc_notify_senders_sn2(ch, xpMsgDelivered, + ch_sn2->remote_GP.get); + } + + /* + * Clear msg->flags in previously sent messages, so that + * they're ready for xpc_allocate_msg(). + */ + xpc_clear_local_msgqueue_flags_sn2(ch); + + ch_sn2->w_remote_GP.get = ch_sn2->remote_GP.get; + + dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, " + "channel=%d\n", ch_sn2->w_remote_GP.get, ch->partid, + ch->number); + + /* + * If anyone was waiting for message queue entries to become + * available, wake them up. + */ + if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) + wake_up(&ch->msg_allocate_wq); + } + + /* + * Now check for newly sent messages by the other side. (The remote + * PUT value will have changed since we last looked at it.) + */ + + if (ch_sn2->w_remote_GP.put != ch_sn2->remote_GP.put) { + /* + * Clear msg->flags in previously received messages, so that + * they're ready for xpc_get_deliverable_payload_sn2(). + */ + xpc_clear_remote_msgqueue_flags_sn2(ch); + + ch_sn2->w_remote_GP.put = ch_sn2->remote_GP.put; + + dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, " + "channel=%d\n", ch_sn2->w_remote_GP.put, ch->partid, + ch->number); + + npayloads_sent = xpc_n_of_deliverable_payloads_sn2(ch); + if (npayloads_sent > 0) { + dev_dbg(xpc_chan, "msgs waiting to be copied and " + "delivered=%d, partid=%d, channel=%d\n", + npayloads_sent, ch->partid, ch->number); + + if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) + xpc_activate_kthreads(ch, npayloads_sent); + } + } + + xpc_msgqueue_deref(ch); +} + +static struct xpc_msg_sn2 * +xpc_pull_remote_msg_sn2(struct xpc_channel *ch, s64 get) +{ + struct xpc_partition *part = &xpc_partitions[ch->partid]; + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + unsigned long remote_msg_pa; + struct xpc_msg_sn2 *msg; + u32 msg_index; + u32 nmsgs; + u64 msg_offset; + enum xp_retval ret; + + if (mutex_lock_interruptible(&ch_sn2->msg_to_pull_mutex) != 0) { + /* we were interrupted by a signal */ + return NULL; + } + + while (get >= ch_sn2->next_msg_to_pull) { + + /* pull as many messages as are ready and able to be pulled */ + + msg_index = ch_sn2->next_msg_to_pull % ch->remote_nentries; + + DBUG_ON(ch_sn2->next_msg_to_pull >= ch_sn2->w_remote_GP.put); + nmsgs = ch_sn2->w_remote_GP.put - ch_sn2->next_msg_to_pull; + if (msg_index + nmsgs > ch->remote_nentries) { + /* ignore the ones that wrap the msg queue for now */ + nmsgs = ch->remote_nentries - msg_index; + } + + msg_offset = msg_index * ch->entry_size; + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue + + msg_offset); + remote_msg_pa = ch_sn2->remote_msgqueue_pa + msg_offset; + + ret = xpc_pull_remote_cachelines_sn2(part, msg, remote_msg_pa, + nmsgs * ch->entry_size); + if (ret != xpSuccess) { + + dev_dbg(xpc_chan, "failed to pull %d msgs starting with" + " msg %ld from partition %d, channel=%d, " + "ret=%d\n", nmsgs, ch_sn2->next_msg_to_pull, + ch->partid, ch->number, ret); + + XPC_DEACTIVATE_PARTITION(part, ret); + + mutex_unlock(&ch_sn2->msg_to_pull_mutex); + return NULL; + } + + ch_sn2->next_msg_to_pull += nmsgs; + } + + mutex_unlock(&ch_sn2->msg_to_pull_mutex); + + /* return the message we were looking for */ + msg_offset = (get % ch->remote_nentries) * ch->entry_size; + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue + msg_offset); + + return msg; +} + +/* + * Get the next deliverable message's payload. + */ +static void * +xpc_get_deliverable_payload_sn2(struct xpc_channel *ch) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + void *payload = NULL; + s64 get; + + do { + if (ch->flags & XPC_C_DISCONNECTING) + break; + + get = ch_sn2->w_local_GP.get; + rmb(); /* guarantee that .get loads before .put */ + if (get == ch_sn2->w_remote_GP.put) + break; + + /* There are messages waiting to be pulled and delivered. + * We need to try to secure one for ourselves. We'll do this + * by trying to increment w_local_GP.get and hope that no one + * else beats us to it. If they do, we'll we'll simply have + * to try again for the next one. + */ + + if (cmpxchg(&ch_sn2->w_local_GP.get, get, get + 1) == get) { + /* we got the entry referenced by get */ + + dev_dbg(xpc_chan, "w_local_GP.get changed to %ld, " + "partid=%d, channel=%d\n", get + 1, + ch->partid, ch->number); + + /* pull the message from the remote partition */ + + msg = xpc_pull_remote_msg_sn2(ch, get); + + DBUG_ON(msg != NULL && msg->number != get); + DBUG_ON(msg != NULL && (msg->flags & XPC_M_SN2_DONE)); + DBUG_ON(msg != NULL && !(msg->flags & XPC_M_SN2_READY)); + + payload = &msg->payload; + break; + } + + } while (1); + + return payload; +} + +/* + * Now we actually send the messages that are ready to be sent by advancing + * the local message queue's Put value and then send a chctl msgrequest to the + * recipient partition. + */ +static void +xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + s64 put = initial_put + 1; + int send_msgrequest = 0; + + while (1) { + + while (1) { + if (put == ch_sn2->w_local_GP.put) + break; + + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2-> + local_msgqueue + (put % + ch->local_nentries) * + ch->entry_size); + + if (!(msg->flags & XPC_M_SN2_READY)) + break; + + put++; + } + + if (put == initial_put) { + /* nothing's changed */ + break; + } + + if (cmpxchg_rel(&ch_sn2->local_GP->put, initial_put, put) != + initial_put) { + /* someone else beat us to it */ + DBUG_ON(ch_sn2->local_GP->put < initial_put); + break; + } + + /* we just set the new value of local_GP->put */ + + dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, " + "channel=%d\n", put, ch->partid, ch->number); + + send_msgrequest = 1; + + /* + * We need to ensure that the message referenced by + * local_GP->put is not XPC_M_SN2_READY or that local_GP->put + * equals w_local_GP.put, so we'll go have a look. + */ + initial_put = put; + } + + if (send_msgrequest) + xpc_send_chctl_msgrequest_sn2(ch); +} + +/* + * Allocate an entry for a message from the message queue associated with the + * specified channel. + */ +static enum xp_retval +xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags, + struct xpc_msg_sn2 **address_of_msg) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + enum xp_retval ret; + s64 put; + + /* + * Get the next available message entry from the local message queue. + * If none are available, we'll make sure that we grab the latest + * GP values. + */ + ret = xpTimeout; + + while (1) { + + put = ch_sn2->w_local_GP.put; + rmb(); /* guarantee that .put loads before .get */ + if (put - ch_sn2->w_remote_GP.get < ch->local_nentries) { + + /* There are available message entries. We need to try + * to secure one for ourselves. We'll do this by trying + * to increment w_local_GP.put as long as someone else + * doesn't beat us to it. If they do, we'll have to + * try again. + */ + if (cmpxchg(&ch_sn2->w_local_GP.put, put, put + 1) == + put) { + /* we got the entry referenced by put */ + break; + } + continue; /* try again */ + } + + /* + * There aren't any available msg entries at this time. + * + * In waiting for a message entry to become available, + * we set a timeout in case the other side is not sending + * completion interrupts. This lets us fake a notify IRQ + * that will cause the notify IRQ handler to fetch the latest + * GP values as if an interrupt was sent by the other side. + */ + if (ret == xpTimeout) + xpc_send_chctl_local_msgrequest_sn2(ch); + + if (flags & XPC_NOWAIT) + return xpNoWait; + + ret = xpc_allocate_msg_wait(ch); + if (ret != xpInterrupted && ret != xpTimeout) + return ret; + } + + /* get the message's address and initialize it */ + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->local_msgqueue + + (put % ch->local_nentries) * + ch->entry_size); + + DBUG_ON(msg->flags != 0); + msg->number = put; + + dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, " + "msg_number=%ld, partid=%d, channel=%d\n", put + 1, + (void *)msg, msg->number, ch->partid, ch->number); + + *address_of_msg = msg; + return xpSuccess; +} + +/* + * Common code that does the actual sending of the message by advancing the + * local message queue's Put value and sends a chctl msgrequest to the + * partition the message is being sent to. + */ +static enum xp_retval +xpc_send_payload_sn2(struct xpc_channel *ch, u32 flags, void *payload, + u16 payload_size, u8 notify_type, xpc_notify_func func, + void *key) +{ + enum xp_retval ret = xpSuccess; + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg = msg; + struct xpc_notify_sn2 *notify = notify; + s64 msg_number; + s64 put; + + DBUG_ON(notify_type == XPC_N_CALL && func == NULL); + + if (XPC_MSG_SIZE(payload_size) > ch->entry_size) + return xpPayloadTooBig; + + xpc_msgqueue_ref(ch); + + if (ch->flags & XPC_C_DISCONNECTING) { + ret = ch->reason; + goto out_1; + } + if (!(ch->flags & XPC_C_CONNECTED)) { + ret = xpNotConnected; + goto out_1; + } + + ret = xpc_allocate_msg_sn2(ch, flags, &msg); + if (ret != xpSuccess) + goto out_1; + + msg_number = msg->number; + + if (notify_type != 0) { + /* + * Tell the remote side to send an ACK interrupt when the + * message has been delivered. + */ + msg->flags |= XPC_M_SN2_INTERRUPT; + + atomic_inc(&ch->n_to_notify); + + notify = &ch_sn2->notify_queue[msg_number % ch->local_nentries]; + notify->func = func; + notify->key = key; + notify->type = notify_type; + + /* ??? Is a mb() needed here? */ + + if (ch->flags & XPC_C_DISCONNECTING) { + /* + * An error occurred between our last error check and + * this one. We will try to clear the type field from + * the notify entry. If we succeed then + * xpc_disconnect_channel() didn't already process + * the notify entry. + */ + if (cmpxchg(¬ify->type, notify_type, 0) == + notify_type) { + atomic_dec(&ch->n_to_notify); + ret = ch->reason; + } + goto out_1; + } + } + + memcpy(&msg->payload, payload, payload_size); + + msg->flags |= XPC_M_SN2_READY; + + /* + * The preceding store of msg->flags must occur before the following + * load of local_GP->put. + */ + mb(); + + /* see if the message is next in line to be sent, if so send it */ + + put = ch_sn2->local_GP->put; + if (put == msg_number) + xpc_send_msgs_sn2(ch, put); + +out_1: + xpc_msgqueue_deref(ch); + return ret; +} + +/* + * Now we actually acknowledge the messages that have been delivered and ack'd + * by advancing the cached remote message queue's Get value and if requested + * send a chctl msgrequest to the message sender's partition. + * + * If a message has XPC_M_SN2_INTERRUPT set, send an interrupt to the partition + * that sent the message. + */ +static void +xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags) +{ + struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; + struct xpc_msg_sn2 *msg; + s64 get = initial_get + 1; + int send_msgrequest = 0; + + while (1) { + + while (1) { + if (get == ch_sn2->w_local_GP.get) + break; + + msg = (struct xpc_msg_sn2 *)((u64)ch_sn2-> + remote_msgqueue + (get % + ch->remote_nentries) * + ch->entry_size); + + if (!(msg->flags & XPC_M_SN2_DONE)) + break; + + msg_flags |= msg->flags; + get++; + } + + if (get == initial_get) { + /* nothing's changed */ + break; + } + + if (cmpxchg_rel(&ch_sn2->local_GP->get, initial_get, get) != + initial_get) { + /* someone else beat us to it */ + DBUG_ON(ch_sn2->local_GP->get <= initial_get); + break; + } + + /* we just set the new value of local_GP->get */ + + dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, " + "channel=%d\n", get, ch->partid, ch->number); + + send_msgrequest = (msg_flags & XPC_M_SN2_INTERRUPT); + + /* + * We need to ensure that the message referenced by + * local_GP->get is not XPC_M_SN2_DONE or that local_GP->get + * equals w_local_GP.get, so we'll go have a look. + */ + initial_get = get; + } + + if (send_msgrequest) + xpc_send_chctl_msgrequest_sn2(ch); +} + +static void +xpc_received_payload_sn2(struct xpc_channel *ch, void *payload) +{ + struct xpc_msg_sn2 *msg; + s64 msg_number; + s64 get; + + msg = container_of(payload, struct xpc_msg_sn2, payload); + msg_number = msg->number; + + dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n", + (void *)msg, msg_number, ch->partid, ch->number); + + DBUG_ON((((u64)msg - (u64)ch->remote_msgqueue) / ch->entry_size) != + msg_number % ch->remote_nentries); + DBUG_ON(msg->flags & XPC_M_SN2_DONE); + + msg->flags |= XPC_M_SN2_DONE; + + /* + * The preceding store of msg->flags must occur before the following + * load of local_GP->get. + */ + mb(); + + /* + * See if this message is next in line to be acknowledged as having + * been delivered. + */ + get = ch->sn.sn2.local_GP->get; + if (get == msg_number) + xpc_acknowledge_msgs_sn2(ch, get, msg->flags); +} + +int +xpc_init_sn2(void) +{ + int ret; + size_t buf_size; + + xpc_setup_partitions_sn = xpc_setup_partitions_sn_sn2; + xpc_get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_sn2; + xpc_setup_rsvd_page_sn = xpc_setup_rsvd_page_sn_sn2; + xpc_increment_heartbeat = xpc_increment_heartbeat_sn2; + xpc_offline_heartbeat = xpc_offline_heartbeat_sn2; + xpc_online_heartbeat = xpc_online_heartbeat_sn2; + xpc_heartbeat_init = xpc_heartbeat_init_sn2; + xpc_heartbeat_exit = xpc_heartbeat_exit_sn2; + xpc_get_remote_heartbeat = xpc_get_remote_heartbeat_sn2; + + xpc_request_partition_activation = xpc_request_partition_activation_sn2; + xpc_request_partition_reactivation = + xpc_request_partition_reactivation_sn2; + xpc_request_partition_deactivation = + xpc_request_partition_deactivation_sn2; + xpc_cancel_partition_deactivation_request = + xpc_cancel_partition_deactivation_request_sn2; + + xpc_process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_sn2; + xpc_setup_ch_structures_sn = xpc_setup_ch_structures_sn_sn2; + xpc_teardown_ch_structures_sn = xpc_teardown_ch_structures_sn_sn2; + xpc_make_first_contact = xpc_make_first_contact_sn2; + + xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_sn2; + xpc_send_chctl_closerequest = xpc_send_chctl_closerequest_sn2; + xpc_send_chctl_closereply = xpc_send_chctl_closereply_sn2; + xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_sn2; + xpc_send_chctl_openreply = xpc_send_chctl_openreply_sn2; + + xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_sn2; + + xpc_setup_msg_structures = xpc_setup_msg_structures_sn2; + xpc_teardown_msg_structures = xpc_teardown_msg_structures_sn2; + + xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_sn2; + xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_sn2; + xpc_n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_sn2; + xpc_get_deliverable_payload = xpc_get_deliverable_payload_sn2; + + xpc_indicate_partition_engaged = xpc_indicate_partition_engaged_sn2; + xpc_indicate_partition_disengaged = + xpc_indicate_partition_disengaged_sn2; + xpc_partition_engaged = xpc_partition_engaged_sn2; + xpc_any_partition_engaged = xpc_any_partition_engaged_sn2; + xpc_assume_partition_disengaged = xpc_assume_partition_disengaged_sn2; + + xpc_send_payload = xpc_send_payload_sn2; + xpc_received_payload = xpc_received_payload_sn2; + + if (offsetof(struct xpc_msg_sn2, payload) > XPC_MSG_HDR_MAX_SIZE) { + dev_err(xpc_part, "header portion of struct xpc_msg_sn2 is " + "larger than %d\n", XPC_MSG_HDR_MAX_SIZE); + return -E2BIG; + } + + buf_size = max(XPC_RP_VARS_SIZE, + XPC_RP_HEADER_SIZE + XP_NASID_MASK_BYTES_SN2); + xpc_remote_copy_buffer_sn2 = xpc_kmalloc_cacheline_aligned(buf_size, + GFP_KERNEL, + &xpc_remote_copy_buffer_base_sn2); + if (xpc_remote_copy_buffer_sn2 == NULL) { + dev_err(xpc_part, "can't get memory for remote copy buffer\n"); + return -ENOMEM; + } + + /* open up protections for IPI and [potentially] amo operations */ + xpc_allow_IPI_ops_sn2(); + xpc_allow_amo_ops_shub_wars_1_1_sn2(); + + /* + * This is safe to do before the xpc_hb_checker thread has started + * because the handler releases a wait queue. If an interrupt is + * received before the thread is waiting, it will not go to sleep, + * but rather immediately process the interrupt. + */ + ret = request_irq(SGI_XPC_ACTIVATE, xpc_handle_activate_IRQ_sn2, 0, + "xpc hb", NULL); + if (ret != 0) { + dev_err(xpc_part, "can't register ACTIVATE IRQ handler, " + "errno=%d\n", -ret); + xpc_disallow_IPI_ops_sn2(); + kfree(xpc_remote_copy_buffer_base_sn2); + } + return ret; +} + +void +xpc_exit_sn2(void) +{ + free_irq(SGI_XPC_ACTIVATE, NULL); + xpc_disallow_IPI_ops_sn2(); + kfree(xpc_remote_copy_buffer_base_sn2); +} diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c new file mode 100644 index 00000000000..1ac694c0162 --- /dev/null +++ b/drivers/misc/sgi-xp/xpc_uv.c @@ -0,0 +1,1443 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +/* + * Cross Partition Communication (XPC) uv-based functions. + * + * Architecture specific implementation of common functions. + * + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <asm/uv/uv_hub.h> +#include "../sgi-gru/gru.h" +#include "../sgi-gru/grukservices.h" +#include "xpc.h" + +static atomic64_t xpc_heartbeat_uv; +static DECLARE_BITMAP(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV); + +#define XPC_ACTIVATE_MSG_SIZE_UV (1 * GRU_CACHE_LINE_BYTES) +#define XPC_NOTIFY_MSG_SIZE_UV (2 * GRU_CACHE_LINE_BYTES) + +#define XPC_ACTIVATE_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \ + XPC_ACTIVATE_MSG_SIZE_UV) +#define XPC_NOTIFY_MQ_SIZE_UV (4 * XP_MAX_NPARTITIONS_UV * \ + XPC_NOTIFY_MSG_SIZE_UV) + +static void *xpc_activate_mq_uv; +static void *xpc_notify_mq_uv; + +static int +xpc_setup_partitions_sn_uv(void) +{ + short partid; + struct xpc_partition_uv *part_uv; + + for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) { + part_uv = &xpc_partitions[partid].sn.uv; + + spin_lock_init(&part_uv->flags_lock); + part_uv->remote_act_state = XPC_P_AS_INACTIVE; + } + return 0; +} + +static void * +xpc_create_gru_mq_uv(unsigned int mq_size, int cpuid, unsigned int irq, + irq_handler_t irq_handler) +{ + int ret; + int nid; + int mq_order; + struct page *page; + void *mq; + + nid = cpu_to_node(cpuid); + mq_order = get_order(mq_size); + page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE, + mq_order); + if (page == NULL) { + dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d " + "bytes of memory on nid=%d for GRU mq\n", mq_size, nid); + return NULL; + } + + mq = page_address(page); + ret = gru_create_message_queue(mq, mq_size); + if (ret != 0) { + dev_err(xpc_part, "gru_create_message_queue() returned " + "error=%d\n", ret); + free_pages((unsigned long)mq, mq_order); + return NULL; + } + + /* !!! Need to do some other things to set up IRQ */ + + ret = request_irq(irq, irq_handler, 0, "xpc", NULL); + if (ret != 0) { + dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n", + irq, ret); + free_pages((unsigned long)mq, mq_order); + return NULL; + } + + /* !!! enable generation of irq when GRU mq op occurs to this mq */ + + /* ??? allow other partitions to access GRU mq? */ + + return mq; +} + +static void +xpc_destroy_gru_mq_uv(void *mq, unsigned int mq_size, unsigned int irq) +{ + /* ??? disallow other partitions to access GRU mq? */ + + /* !!! disable generation of irq when GRU mq op occurs to this mq */ + + free_irq(irq, NULL); + + free_pages((unsigned long)mq, get_order(mq_size)); +} + +static enum xp_retval +xpc_send_gru_msg(unsigned long mq_gpa, void *msg, size_t msg_size) +{ + enum xp_retval xp_ret; + int ret; + + while (1) { + ret = gru_send_message_gpa(mq_gpa, msg, msg_size); + if (ret == MQE_OK) { + xp_ret = xpSuccess; + break; + } + + if (ret == MQE_QUEUE_FULL) { + dev_dbg(xpc_chan, "gru_send_message_gpa() returned " + "error=MQE_QUEUE_FULL\n"); + /* !!! handle QLimit reached; delay & try again */ + /* ??? Do we add a limit to the number of retries? */ + (void)msleep_interruptible(10); + } else if (ret == MQE_CONGESTION) { + dev_dbg(xpc_chan, "gru_send_message_gpa() returned " + "error=MQE_CONGESTION\n"); + /* !!! handle LB Overflow; simply try again */ + /* ??? Do we add a limit to the number of retries? */ + } else { + /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */ + dev_err(xpc_chan, "gru_send_message_gpa() returned " + "error=%d\n", ret); + xp_ret = xpGruSendMqError; + break; + } + } + return xp_ret; +} + +static void +xpc_process_activate_IRQ_rcvd_uv(void) +{ + unsigned long irq_flags; + short partid; + struct xpc_partition *part; + u8 act_state_req; + + DBUG_ON(xpc_activate_IRQ_rcvd == 0); + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) { + part = &xpc_partitions[partid]; + + if (part->sn.uv.act_state_req == 0) + continue; + + xpc_activate_IRQ_rcvd--; + BUG_ON(xpc_activate_IRQ_rcvd < 0); + + act_state_req = part->sn.uv.act_state_req; + part->sn.uv.act_state_req = 0; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + if (act_state_req == XPC_P_ASR_ACTIVATE_UV) { + if (part->act_state == XPC_P_AS_INACTIVE) + xpc_activate_partition(part); + else if (part->act_state == XPC_P_AS_DEACTIVATING) + XPC_DEACTIVATE_PARTITION(part, xpReactivating); + + } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) { + if (part->act_state == XPC_P_AS_INACTIVE) + xpc_activate_partition(part); + else + XPC_DEACTIVATE_PARTITION(part, xpReactivating); + + } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) { + XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason); + + } else { + BUG(); + } + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (xpc_activate_IRQ_rcvd == 0) + break; + } + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + +} + +static void +xpc_handle_activate_mq_msg_uv(struct xpc_partition *part, + struct xpc_activate_mq_msghdr_uv *msg_hdr, + int *wakeup_hb_checker) +{ + unsigned long irq_flags; + struct xpc_partition_uv *part_uv = &part->sn.uv; + struct xpc_openclose_args *args; + + part_uv->remote_act_state = msg_hdr->act_state; + + switch (msg_hdr->type) { + case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV: + /* syncing of remote_act_state was just done above */ + break; + + case XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV: { + struct xpc_activate_mq_msg_heartbeat_req_uv *msg; + + msg = container_of(msg_hdr, + struct xpc_activate_mq_msg_heartbeat_req_uv, + hdr); + part_uv->heartbeat = msg->heartbeat; + break; + } + case XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV: { + struct xpc_activate_mq_msg_heartbeat_req_uv *msg; + + msg = container_of(msg_hdr, + struct xpc_activate_mq_msg_heartbeat_req_uv, + hdr); + part_uv->heartbeat = msg->heartbeat; + + spin_lock_irqsave(&part_uv->flags_lock, irq_flags); + part_uv->flags |= XPC_P_HEARTBEAT_OFFLINE_UV; + spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags); + break; + } + case XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV: { + struct xpc_activate_mq_msg_heartbeat_req_uv *msg; + + msg = container_of(msg_hdr, + struct xpc_activate_mq_msg_heartbeat_req_uv, + hdr); + part_uv->heartbeat = msg->heartbeat; + + spin_lock_irqsave(&part_uv->flags_lock, irq_flags); + part_uv->flags &= ~XPC_P_HEARTBEAT_OFFLINE_UV; + spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags); + break; + } + case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: { + struct xpc_activate_mq_msg_activate_req_uv *msg; + + /* + * ??? Do we deal here with ts_jiffies being different + * ??? if act_state != XPC_P_AS_INACTIVE instead of + * ??? below? + */ + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_activate_req_uv, hdr); + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV; + part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */ + part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies; + part_uv->remote_activate_mq_gpa = msg->activate_mq_gpa; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + (*wakeup_hb_checker)++; + break; + } + case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: { + struct xpc_activate_mq_msg_deactivate_req_uv *msg; + + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_deactivate_req_uv, hdr); + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV; + part_uv->reason = msg->reason; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + (*wakeup_hb_checker)++; + return; + } + case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: { + struct xpc_activate_mq_msg_chctl_closerequest_uv *msg; + + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_chctl_closerequest_uv, + hdr); + args = &part->remote_openclose_args[msg->ch_number]; + args->reason = msg->reason; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + xpc_wakeup_channel_mgr(part); + break; + } + case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: { + struct xpc_activate_mq_msg_chctl_closereply_uv *msg; + + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_chctl_closereply_uv, + hdr); + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + xpc_wakeup_channel_mgr(part); + break; + } + case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: { + struct xpc_activate_mq_msg_chctl_openrequest_uv *msg; + + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_chctl_openrequest_uv, + hdr); + args = &part->remote_openclose_args[msg->ch_number]; + args->entry_size = msg->entry_size; + args->local_nentries = msg->local_nentries; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + xpc_wakeup_channel_mgr(part); + break; + } + case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: { + struct xpc_activate_mq_msg_chctl_openreply_uv *msg; + + msg = container_of(msg_hdr, struct + xpc_activate_mq_msg_chctl_openreply_uv, hdr); + args = &part->remote_openclose_args[msg->ch_number]; + args->remote_nentries = msg->remote_nentries; + args->local_nentries = msg->local_nentries; + args->local_msgqueue_pa = msg->local_notify_mq_gpa; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + xpc_wakeup_channel_mgr(part); + break; + } + case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV: + spin_lock_irqsave(&part_uv->flags_lock, irq_flags); + part_uv->flags |= XPC_P_ENGAGED_UV; + spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags); + break; + + case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV: + spin_lock_irqsave(&part_uv->flags_lock, irq_flags); + part_uv->flags &= ~XPC_P_ENGAGED_UV; + spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags); + break; + + default: + dev_err(xpc_part, "received unknown activate_mq msg type=%d " + "from partition=%d\n", msg_hdr->type, XPC_PARTID(part)); + + /* get hb checker to deactivate from the remote partition */ + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV; + part_uv->reason = xpBadMsgType; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + (*wakeup_hb_checker)++; + return; + } + + if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies && + part->remote_rp_ts_jiffies != 0) { + /* + * ??? Does what we do here need to be sensitive to + * ??? act_state or remote_act_state? + */ + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + (*wakeup_hb_checker)++; + } +} + +static irqreturn_t +xpc_handle_activate_IRQ_uv(int irq, void *dev_id) +{ + struct xpc_activate_mq_msghdr_uv *msg_hdr; + short partid; + struct xpc_partition *part; + int wakeup_hb_checker = 0; + + while ((msg_hdr = gru_get_next_message(xpc_activate_mq_uv)) != NULL) { + + partid = msg_hdr->partid; + if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) { + dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() " + "received invalid partid=0x%x in message\n", + partid); + } else { + part = &xpc_partitions[partid]; + if (xpc_part_ref(part)) { + xpc_handle_activate_mq_msg_uv(part, msg_hdr, + &wakeup_hb_checker); + xpc_part_deref(part); + } + } + + gru_free_message(xpc_activate_mq_uv, msg_hdr); + } + + if (wakeup_hb_checker) + wake_up_interruptible(&xpc_activate_IRQ_wq); + + return IRQ_HANDLED; +} + +static enum xp_retval +xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size, + int msg_type) +{ + struct xpc_activate_mq_msghdr_uv *msg_hdr = msg; + + DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV); + + msg_hdr->type = msg_type; + msg_hdr->partid = XPC_PARTID(part); + msg_hdr->act_state = part->act_state; + msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies; + + /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */ + return xpc_send_gru_msg(part->sn.uv.remote_activate_mq_gpa, msg, + msg_size); +} + +static void +xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg, + size_t msg_size, int msg_type) +{ + enum xp_retval ret; + + ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type); + if (unlikely(ret != xpSuccess)) + XPC_DEACTIVATE_PARTITION(part, ret); +} + +static void +xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags, + void *msg, size_t msg_size, int msg_type) +{ + struct xpc_partition *part = &xpc_partitions[ch->number]; + enum xp_retval ret; + + ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type); + if (unlikely(ret != xpSuccess)) { + if (irq_flags != NULL) + spin_unlock_irqrestore(&ch->lock, *irq_flags); + + XPC_DEACTIVATE_PARTITION(part, ret); + + if (irq_flags != NULL) + spin_lock_irqsave(&ch->lock, *irq_flags); + } +} + +static void +xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req) +{ + unsigned long irq_flags; + struct xpc_partition_uv *part_uv = &part->sn.uv; + + /* + * !!! Make our side think that the remote parition sent an activate + * !!! message our way by doing what the activate IRQ handler would + * !!! do had one really been sent. + */ + + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = act_state_req; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + wake_up_interruptible(&xpc_activate_IRQ_wq); +} + +static enum xp_retval +xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa, + size_t *len) +{ + /* !!! call the UV version of sn_partition_reserved_page_pa() */ + return xpUnsupported; +} + +static int +xpc_setup_rsvd_page_sn_uv(struct xpc_rsvd_page *rp) +{ + rp->sn.activate_mq_gpa = uv_gpa(xpc_activate_mq_uv); + return 0; +} + +static void +xpc_send_heartbeat_uv(int msg_type) +{ + short partid; + struct xpc_partition *part; + struct xpc_activate_mq_msg_heartbeat_req_uv msg; + + /* + * !!! On uv we're broadcasting a heartbeat message every 5 seconds. + * !!! Whereas on sn2 we're bte_copy'ng the heartbeat info every 20 + * !!! seconds. This is an increase in numalink traffic. + * ??? Is this good? + */ + + msg.heartbeat = atomic64_inc_return(&xpc_heartbeat_uv); + + partid = find_first_bit(xpc_heartbeating_to_mask_uv, + XP_MAX_NPARTITIONS_UV); + + while (partid < XP_MAX_NPARTITIONS_UV) { + part = &xpc_partitions[partid]; + + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + msg_type); + + partid = find_next_bit(xpc_heartbeating_to_mask_uv, + XP_MAX_NPARTITIONS_UV, partid + 1); + } +} + +static void +xpc_increment_heartbeat_uv(void) +{ + xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV); +} + +static void +xpc_offline_heartbeat_uv(void) +{ + xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV); +} + +static void +xpc_online_heartbeat_uv(void) +{ + xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV); +} + +static void +xpc_heartbeat_init_uv(void) +{ + atomic64_set(&xpc_heartbeat_uv, 0); + bitmap_zero(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV); + xpc_heartbeating_to_mask = &xpc_heartbeating_to_mask_uv[0]; +} + +static void +xpc_heartbeat_exit_uv(void) +{ + xpc_send_heartbeat_uv(XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV); +} + +static enum xp_retval +xpc_get_remote_heartbeat_uv(struct xpc_partition *part) +{ + struct xpc_partition_uv *part_uv = &part->sn.uv; + enum xp_retval ret = xpNoHeartbeat; + + if (part_uv->remote_act_state != XPC_P_AS_INACTIVE && + part_uv->remote_act_state != XPC_P_AS_DEACTIVATING) { + + if (part_uv->heartbeat != part->last_heartbeat || + (part_uv->flags & XPC_P_HEARTBEAT_OFFLINE_UV)) { + + part->last_heartbeat = part_uv->heartbeat; + ret = xpSuccess; + } + } + return ret; +} + +static void +xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp, + unsigned long remote_rp_gpa, int nasid) +{ + short partid = remote_rp->SAL_partid; + struct xpc_partition *part = &xpc_partitions[partid]; + struct xpc_activate_mq_msg_activate_req_uv msg; + + part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */ + part->remote_rp_ts_jiffies = remote_rp->ts_jiffies; + part->sn.uv.remote_activate_mq_gpa = remote_rp->sn.activate_mq_gpa; + + /* + * ??? Is it a good idea to make this conditional on what is + * ??? potentially stale state information? + */ + if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) { + msg.rp_gpa = uv_gpa(xpc_rsvd_page); + msg.activate_mq_gpa = xpc_rsvd_page->sn.activate_mq_gpa; + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV); + } + + if (part->act_state == XPC_P_AS_INACTIVE) + xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV); +} + +static void +xpc_request_partition_reactivation_uv(struct xpc_partition *part) +{ + xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV); +} + +static void +xpc_request_partition_deactivation_uv(struct xpc_partition *part) +{ + struct xpc_activate_mq_msg_deactivate_req_uv msg; + + /* + * ??? Is it a good idea to make this conditional on what is + * ??? potentially stale state information? + */ + if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING && + part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) { + + msg.reason = part->reason; + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV); + } +} + +static void +xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part) +{ + /* nothing needs to be done */ + return; +} + +static void +xpc_init_fifo_uv(struct xpc_fifo_head_uv *head) +{ + head->first = NULL; + head->last = NULL; + spin_lock_init(&head->lock); + head->n_entries = 0; +} + +static void * +xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head) +{ + unsigned long irq_flags; + struct xpc_fifo_entry_uv *first; + + spin_lock_irqsave(&head->lock, irq_flags); + first = head->first; + if (head->first != NULL) { + head->first = first->next; + if (head->first == NULL) + head->last = NULL; + } + head->n_entries++; + spin_unlock_irqrestore(&head->lock, irq_flags); + first->next = NULL; + return first; +} + +static void +xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head, + struct xpc_fifo_entry_uv *last) +{ + unsigned long irq_flags; + + last->next = NULL; + spin_lock_irqsave(&head->lock, irq_flags); + if (head->last != NULL) + head->last->next = last; + else + head->first = last; + head->last = last; + head->n_entries--; + BUG_ON(head->n_entries < 0); + spin_unlock_irqrestore(&head->lock, irq_flags); +} + +static int +xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head) +{ + return head->n_entries; +} + +/* + * Setup the channel structures that are uv specific. + */ +static enum xp_retval +xpc_setup_ch_structures_sn_uv(struct xpc_partition *part) +{ + struct xpc_channel_uv *ch_uv; + int ch_number; + + for (ch_number = 0; ch_number < part->nchannels; ch_number++) { + ch_uv = &part->channels[ch_number].sn.uv; + + xpc_init_fifo_uv(&ch_uv->msg_slot_free_list); + xpc_init_fifo_uv(&ch_uv->recv_msg_list); + } + + return xpSuccess; +} + +/* + * Teardown the channel structures that are uv specific. + */ +static void +xpc_teardown_ch_structures_sn_uv(struct xpc_partition *part) +{ + /* nothing needs to be done */ + return; +} + +static enum xp_retval +xpc_make_first_contact_uv(struct xpc_partition *part) +{ + struct xpc_activate_mq_msg_uv msg; + + /* + * We send a sync msg to get the remote partition's remote_act_state + * updated to our current act_state which at this point should + * be XPC_P_AS_ACTIVATING. + */ + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV); + + while (part->sn.uv.remote_act_state != XPC_P_AS_ACTIVATING) { + + dev_dbg(xpc_part, "waiting to make first contact with " + "partition %d\n", XPC_PARTID(part)); + + /* wait a 1/4 of a second or so */ + (void)msleep_interruptible(250); + + if (part->act_state == XPC_P_AS_DEACTIVATING) + return part->reason; + } + + return xpSuccess; +} + +static u64 +xpc_get_chctl_all_flags_uv(struct xpc_partition *part) +{ + unsigned long irq_flags; + union xpc_channel_ctl_flags chctl; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + chctl = part->chctl; + if (chctl.all_flags != 0) + part->chctl.all_flags = 0; + + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + return chctl.all_flags; +} + +static enum xp_retval +xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch) +{ + struct xpc_channel_uv *ch_uv = &ch->sn.uv; + struct xpc_send_msg_slot_uv *msg_slot; + unsigned long irq_flags; + int nentries; + int entry; + size_t nbytes; + + for (nentries = ch->local_nentries; nentries > 0; nentries--) { + nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv); + ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL); + if (ch_uv->send_msg_slots == NULL) + continue; + + for (entry = 0; entry < nentries; entry++) { + msg_slot = &ch_uv->send_msg_slots[entry]; + + msg_slot->msg_slot_number = entry; + xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list, + &msg_slot->next); + } + + spin_lock_irqsave(&ch->lock, irq_flags); + if (nentries < ch->local_nentries) + ch->local_nentries = nentries; + spin_unlock_irqrestore(&ch->lock, irq_flags); + return xpSuccess; + } + + return xpNoMemory; +} + +static enum xp_retval +xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch) +{ + struct xpc_channel_uv *ch_uv = &ch->sn.uv; + struct xpc_notify_mq_msg_uv *msg_slot; + unsigned long irq_flags; + int nentries; + int entry; + size_t nbytes; + + for (nentries = ch->remote_nentries; nentries > 0; nentries--) { + nbytes = nentries * ch->entry_size; + ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL); + if (ch_uv->recv_msg_slots == NULL) + continue; + + for (entry = 0; entry < nentries; entry++) { + msg_slot = ch_uv->recv_msg_slots + entry * + ch->entry_size; + + msg_slot->hdr.msg_slot_number = entry; + } + + spin_lock_irqsave(&ch->lock, irq_flags); + if (nentries < ch->remote_nentries) + ch->remote_nentries = nentries; + spin_unlock_irqrestore(&ch->lock, irq_flags); + return xpSuccess; + } + + return xpNoMemory; +} + +/* + * Allocate msg_slots associated with the channel. + */ +static enum xp_retval +xpc_setup_msg_structures_uv(struct xpc_channel *ch) +{ + static enum xp_retval ret; + struct xpc_channel_uv *ch_uv = &ch->sn.uv; + + DBUG_ON(ch->flags & XPC_C_SETUP); + + ret = xpc_allocate_send_msg_slot_uv(ch); + if (ret == xpSuccess) { + + ret = xpc_allocate_recv_msg_slot_uv(ch); + if (ret != xpSuccess) { + kfree(ch_uv->send_msg_slots); + xpc_init_fifo_uv(&ch_uv->msg_slot_free_list); + } + } + return ret; +} + +/* + * Free up msg_slots and clear other stuff that were setup for the specified + * channel. + */ +static void +xpc_teardown_msg_structures_uv(struct xpc_channel *ch) +{ + struct xpc_channel_uv *ch_uv = &ch->sn.uv; + + DBUG_ON(!spin_is_locked(&ch->lock)); + + ch_uv->remote_notify_mq_gpa = 0; + + if (ch->flags & XPC_C_SETUP) { + xpc_init_fifo_uv(&ch_uv->msg_slot_free_list); + kfree(ch_uv->send_msg_slots); + xpc_init_fifo_uv(&ch_uv->recv_msg_list); + kfree(ch_uv->recv_msg_slots); + } +} + +static void +xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_activate_mq_msg_chctl_closerequest_uv msg; + + msg.ch_number = ch->number; + msg.reason = ch->reason; + xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV); +} + +static void +xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_activate_mq_msg_chctl_closereply_uv msg; + + msg.ch_number = ch->number; + xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV); +} + +static void +xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_activate_mq_msg_chctl_openrequest_uv msg; + + msg.ch_number = ch->number; + msg.entry_size = ch->entry_size; + msg.local_nentries = ch->local_nentries; + xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV); +} + +static void +xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags) +{ + struct xpc_activate_mq_msg_chctl_openreply_uv msg; + + msg.ch_number = ch->number; + msg.local_nentries = ch->local_nentries; + msg.remote_nentries = ch->remote_nentries; + msg.local_notify_mq_gpa = uv_gpa(xpc_notify_mq_uv); + xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV); +} + +static void +xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number) +{ + unsigned long irq_flags; + + spin_lock_irqsave(&part->chctl_lock, irq_flags); + part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST; + spin_unlock_irqrestore(&part->chctl_lock, irq_flags); + + xpc_wakeup_channel_mgr(part); +} + +static void +xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch, + unsigned long msgqueue_pa) +{ + ch->sn.uv.remote_notify_mq_gpa = msgqueue_pa; +} + +static void +xpc_indicate_partition_engaged_uv(struct xpc_partition *part) +{ + struct xpc_activate_mq_msg_uv msg; + + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV); +} + +static void +xpc_indicate_partition_disengaged_uv(struct xpc_partition *part) +{ + struct xpc_activate_mq_msg_uv msg; + + xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg), + XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV); +} + +static void +xpc_assume_partition_disengaged_uv(short partid) +{ + struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv; + unsigned long irq_flags; + + spin_lock_irqsave(&part_uv->flags_lock, irq_flags); + part_uv->flags &= ~XPC_P_ENGAGED_UV; + spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags); +} + +static int +xpc_partition_engaged_uv(short partid) +{ + return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0; +} + +static int +xpc_any_partition_engaged_uv(void) +{ + struct xpc_partition_uv *part_uv; + short partid; + + for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) { + part_uv = &xpc_partitions[partid].sn.uv; + if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0) + return 1; + } + return 0; +} + +static enum xp_retval +xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags, + struct xpc_send_msg_slot_uv **address_of_msg_slot) +{ + enum xp_retval ret; + struct xpc_send_msg_slot_uv *msg_slot; + struct xpc_fifo_entry_uv *entry; + + while (1) { + entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list); + if (entry != NULL) + break; + + if (flags & XPC_NOWAIT) + return xpNoWait; + + ret = xpc_allocate_msg_wait(ch); + if (ret != xpInterrupted && ret != xpTimeout) + return ret; + } + + msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next); + *address_of_msg_slot = msg_slot; + return xpSuccess; +} + +static void +xpc_free_msg_slot_uv(struct xpc_channel *ch, + struct xpc_send_msg_slot_uv *msg_slot) +{ + xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next); + + /* wakeup anyone waiting for a free msg slot */ + if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) + wake_up(&ch->msg_allocate_wq); +} + +static void +xpc_notify_sender_uv(struct xpc_channel *ch, + struct xpc_send_msg_slot_uv *msg_slot, + enum xp_retval reason) +{ + xpc_notify_func func = msg_slot->func; + + if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) { + + atomic_dec(&ch->n_to_notify); + + dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p " + "msg_slot_number=%d partid=%d channel=%d\n", msg_slot, + msg_slot->msg_slot_number, ch->partid, ch->number); + + func(reason, ch->partid, ch->number, msg_slot->key); + + dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p " + "msg_slot_number=%d partid=%d channel=%d\n", msg_slot, + msg_slot->msg_slot_number, ch->partid, ch->number); + } +} + +static void +xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch, + struct xpc_notify_mq_msg_uv *msg) +{ + struct xpc_send_msg_slot_uv *msg_slot; + int entry = msg->hdr.msg_slot_number % ch->local_nentries; + + msg_slot = &ch->sn.uv.send_msg_slots[entry]; + + BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number); + msg_slot->msg_slot_number += ch->local_nentries; + + if (msg_slot->func != NULL) + xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered); + + xpc_free_msg_slot_uv(ch, msg_slot); +} + +static void +xpc_handle_notify_mq_msg_uv(struct xpc_partition *part, + struct xpc_notify_mq_msg_uv *msg) +{ + struct xpc_partition_uv *part_uv = &part->sn.uv; + struct xpc_channel *ch; + struct xpc_channel_uv *ch_uv; + struct xpc_notify_mq_msg_uv *msg_slot; + unsigned long irq_flags; + int ch_number = msg->hdr.ch_number; + + if (unlikely(ch_number >= part->nchannels)) { + dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid " + "channel number=0x%x in message from partid=%d\n", + ch_number, XPC_PARTID(part)); + + /* get hb checker to deactivate from the remote partition */ + spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags); + if (part_uv->act_state_req == 0) + xpc_activate_IRQ_rcvd++; + part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV; + part_uv->reason = xpBadChannelNumber; + spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags); + + wake_up_interruptible(&xpc_activate_IRQ_wq); + return; + } + + ch = &part->channels[ch_number]; + xpc_msgqueue_ref(ch); + + if (!(ch->flags & XPC_C_CONNECTED)) { + xpc_msgqueue_deref(ch); + return; + } + + /* see if we're really dealing with an ACK for a previously sent msg */ + if (msg->hdr.size == 0) { + xpc_handle_notify_mq_ack_uv(ch, msg); + xpc_msgqueue_deref(ch); + return; + } + + /* we're dealing with a normal message sent via the notify_mq */ + ch_uv = &ch->sn.uv; + + msg_slot = (struct xpc_notify_mq_msg_uv *)((u64)ch_uv->recv_msg_slots + + (msg->hdr.msg_slot_number % ch->remote_nentries) * + ch->entry_size); + + BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number); + BUG_ON(msg_slot->hdr.size != 0); + + memcpy(msg_slot, msg, msg->hdr.size); + + xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next); + + if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) { + /* + * If there is an existing idle kthread get it to deliver + * the payload, otherwise we'll have to get the channel mgr + * for this partition to create a kthread to do the delivery. + */ + if (atomic_read(&ch->kthreads_idle) > 0) + wake_up_nr(&ch->idle_wq, 1); + else + xpc_send_chctl_local_msgrequest_uv(part, ch->number); + } + xpc_msgqueue_deref(ch); +} + +static irqreturn_t +xpc_handle_notify_IRQ_uv(int irq, void *dev_id) +{ + struct xpc_notify_mq_msg_uv *msg; + short partid; + struct xpc_partition *part; + + while ((msg = gru_get_next_message(xpc_notify_mq_uv)) != NULL) { + + partid = msg->hdr.partid; + if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) { + dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received " + "invalid partid=0x%x in message\n", partid); + } else { + part = &xpc_partitions[partid]; + + if (xpc_part_ref(part)) { + xpc_handle_notify_mq_msg_uv(part, msg); + xpc_part_deref(part); + } + } + + gru_free_message(xpc_notify_mq_uv, msg); + } + + return IRQ_HANDLED; +} + +static int +xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch) +{ + return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list); +} + +static void +xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number) +{ + struct xpc_channel *ch = &part->channels[ch_number]; + int ndeliverable_payloads; + + xpc_msgqueue_ref(ch); + + ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch); + + if (ndeliverable_payloads > 0 && + (ch->flags & XPC_C_CONNECTED) && + (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) { + + xpc_activate_kthreads(ch, ndeliverable_payloads); + } + + xpc_msgqueue_deref(ch); +} + +static enum xp_retval +xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload, + u16 payload_size, u8 notify_type, xpc_notify_func func, + void *key) +{ + enum xp_retval ret = xpSuccess; + struct xpc_send_msg_slot_uv *msg_slot = NULL; + struct xpc_notify_mq_msg_uv *msg; + u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV]; + size_t msg_size; + + DBUG_ON(notify_type != XPC_N_CALL); + + msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size; + if (msg_size > ch->entry_size) + return xpPayloadTooBig; + + xpc_msgqueue_ref(ch); + + if (ch->flags & XPC_C_DISCONNECTING) { + ret = ch->reason; + goto out_1; + } + if (!(ch->flags & XPC_C_CONNECTED)) { + ret = xpNotConnected; + goto out_1; + } + + ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot); + if (ret != xpSuccess) + goto out_1; + + if (func != NULL) { + atomic_inc(&ch->n_to_notify); + + msg_slot->key = key; + wmb(); /* a non-NULL func must hit memory after the key */ + msg_slot->func = func; + + if (ch->flags & XPC_C_DISCONNECTING) { + ret = ch->reason; + goto out_2; + } + } + + msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer; + msg->hdr.partid = xp_partition_id; + msg->hdr.ch_number = ch->number; + msg->hdr.size = msg_size; + msg->hdr.msg_slot_number = msg_slot->msg_slot_number; + memcpy(&msg->payload, payload, payload_size); + + ret = xpc_send_gru_msg(ch->sn.uv.remote_notify_mq_gpa, msg, msg_size); + if (ret == xpSuccess) + goto out_1; + + XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret); +out_2: + if (func != NULL) { + /* + * Try to NULL the msg_slot's func field. If we fail, then + * xpc_notify_senders_of_disconnect_uv() beat us to it, in which + * case we need to pretend we succeeded to send the message + * since the user will get a callout for the disconnect error + * by xpc_notify_senders_of_disconnect_uv(), and to also get an + * error returned here will confuse them. Additionally, since + * in this case the channel is being disconnected we don't need + * to put the the msg_slot back on the free list. + */ + if (cmpxchg(&msg_slot->func, func, NULL) != func) { + ret = xpSuccess; + goto out_1; + } + + msg_slot->key = NULL; + atomic_dec(&ch->n_to_notify); + } + xpc_free_msg_slot_uv(ch, msg_slot); +out_1: + xpc_msgqueue_deref(ch); + return ret; +} + +/* + * Tell the callers of xpc_send_notify() that the status of their payloads + * is unknown because the channel is now disconnecting. + * + * We don't worry about putting these msg_slots on the free list since the + * msg_slots themselves are about to be kfree'd. + */ +static void +xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch) +{ + struct xpc_send_msg_slot_uv *msg_slot; + int entry; + + DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING)); + + for (entry = 0; entry < ch->local_nentries; entry++) { + + if (atomic_read(&ch->n_to_notify) == 0) + break; + + msg_slot = &ch->sn.uv.send_msg_slots[entry]; + if (msg_slot->func != NULL) + xpc_notify_sender_uv(ch, msg_slot, ch->reason); + } +} + +/* + * Get the next deliverable message's payload. + */ +static void * +xpc_get_deliverable_payload_uv(struct xpc_channel *ch) +{ + struct xpc_fifo_entry_uv *entry; + struct xpc_notify_mq_msg_uv *msg; + void *payload = NULL; + + if (!(ch->flags & XPC_C_DISCONNECTING)) { + entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list); + if (entry != NULL) { + msg = container_of(entry, struct xpc_notify_mq_msg_uv, + hdr.u.next); + payload = &msg->payload; + } + } + return payload; +} + +static void +xpc_received_payload_uv(struct xpc_channel *ch, void *payload) +{ + struct xpc_notify_mq_msg_uv *msg; + enum xp_retval ret; + + msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload); + + /* return an ACK to the sender of this message */ + + msg->hdr.partid = xp_partition_id; + msg->hdr.size = 0; /* size of zero indicates this is an ACK */ + + ret = xpc_send_gru_msg(ch->sn.uv.remote_notify_mq_gpa, msg, + sizeof(struct xpc_notify_mq_msghdr_uv)); + if (ret != xpSuccess) + XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret); + + msg->hdr.msg_slot_number += ch->remote_nentries; +} + +int +xpc_init_uv(void) +{ + xpc_setup_partitions_sn = xpc_setup_partitions_sn_uv; + xpc_process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv; + xpc_get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv; + xpc_setup_rsvd_page_sn = xpc_setup_rsvd_page_sn_uv; + xpc_increment_heartbeat = xpc_increment_heartbeat_uv; + xpc_offline_heartbeat = xpc_offline_heartbeat_uv; + xpc_online_heartbeat = xpc_online_heartbeat_uv; + xpc_heartbeat_init = xpc_heartbeat_init_uv; + xpc_heartbeat_exit = xpc_heartbeat_exit_uv; + xpc_get_remote_heartbeat = xpc_get_remote_heartbeat_uv; + + xpc_request_partition_activation = xpc_request_partition_activation_uv; + xpc_request_partition_reactivation = + xpc_request_partition_reactivation_uv; + xpc_request_partition_deactivation = + xpc_request_partition_deactivation_uv; + xpc_cancel_partition_deactivation_request = + xpc_cancel_partition_deactivation_request_uv; + + xpc_setup_ch_structures_sn = xpc_setup_ch_structures_sn_uv; + xpc_teardown_ch_structures_sn = xpc_teardown_ch_structures_sn_uv; + + xpc_make_first_contact = xpc_make_first_contact_uv; + + xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_uv; + xpc_send_chctl_closerequest = xpc_send_chctl_closerequest_uv; + xpc_send_chctl_closereply = xpc_send_chctl_closereply_uv; + xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_uv; + xpc_send_chctl_openreply = xpc_send_chctl_openreply_uv; + + xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv; + + xpc_setup_msg_structures = xpc_setup_msg_structures_uv; + xpc_teardown_msg_structures = xpc_teardown_msg_structures_uv; + + xpc_indicate_partition_engaged = xpc_indicate_partition_engaged_uv; + xpc_indicate_partition_disengaged = + xpc_indicate_partition_disengaged_uv; + xpc_assume_partition_disengaged = xpc_assume_partition_disengaged_uv; + xpc_partition_engaged = xpc_partition_engaged_uv; + xpc_any_partition_engaged = xpc_any_partition_engaged_uv; + + xpc_n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv; + xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv; + xpc_send_payload = xpc_send_payload_uv; + xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv; + xpc_get_deliverable_payload = xpc_get_deliverable_payload_uv; + xpc_received_payload = xpc_received_payload_uv; + + if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) { + dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n", + XPC_MSG_HDR_MAX_SIZE); + return -E2BIG; + } + + /* ??? The cpuid argument's value is 0, is that what we want? */ + /* !!! The irq argument's value isn't correct. */ + xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0, 0, + xpc_handle_activate_IRQ_uv); + if (xpc_activate_mq_uv == NULL) + return -ENOMEM; + + /* ??? The cpuid argument's value is 0, is that what we want? */ + /* !!! The irq argument's value isn't correct. */ + xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0, 0, + xpc_handle_notify_IRQ_uv); + if (xpc_notify_mq_uv == NULL) { + /* !!! The irq argument's value isn't correct. */ + xpc_destroy_gru_mq_uv(xpc_activate_mq_uv, + XPC_ACTIVATE_MQ_SIZE_UV, 0); + return -ENOMEM; + } + + return 0; +} + +void +xpc_exit_uv(void) +{ + /* !!! The irq argument's value isn't correct. */ + xpc_destroy_gru_mq_uv(xpc_notify_mq_uv, XPC_NOTIFY_MQ_SIZE_UV, 0); + + /* !!! The irq argument's value isn't correct. */ + xpc_destroy_gru_mq_uv(xpc_activate_mq_uv, XPC_ACTIVATE_MQ_SIZE_UV, 0); +} diff --git a/drivers/misc/sgi-xp/xpnet.c b/drivers/misc/sgi-xp/xpnet.c index 822dc8e8d7f..71513b3af70 100644 --- a/drivers/misc/sgi-xp/xpnet.c +++ b/drivers/misc/sgi-xp/xpnet.c @@ -21,21 +21,8 @@ */ #include <linux/module.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/ioport.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> -#include <linux/delay.h> -#include <linux/ethtool.h> -#include <linux/mii.h> -#include <linux/smp.h> -#include <linux/string.h> -#include <asm/sn/bte.h> -#include <asm/sn/io.h> -#include <asm/sn/sn_sal.h> -#include <asm/atomic.h> #include "xp.h" /* @@ -57,7 +44,7 @@ struct xpnet_message { u16 version; /* Version for this message */ u16 embedded_bytes; /* #of bytes embedded in XPC message */ u32 magic; /* Special number indicating this is xpnet */ - u64 buf_pa; /* phys address of buffer to retrieve */ + unsigned long buf_pa; /* phys address of buffer to retrieve */ u32 size; /* #of bytes in buffer */ u8 leadin_ignore; /* #of bytes to ignore at the beginning */ u8 tailout_ignore; /* #of bytes to ignore at the end */ @@ -70,11 +57,10 @@ struct xpnet_message { * * XPC expects each message to exist in an individual cacheline. */ -#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET) +#define XPNET_MSG_SIZE XPC_MSG_PAYLOAD_MAX_SIZE #define XPNET_MSG_DATA_MAX \ - (XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data)) -#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE)) -#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE) + (XPNET_MSG_SIZE - offsetof(struct xpnet_message, data)) +#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPC_MSG_MAX_SIZE) #define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1) #define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1) @@ -105,7 +91,6 @@ struct xpnet_message { * then be released. */ struct xpnet_pending_msg { - struct list_head free_list; struct sk_buff *skb; atomic_t use_count; }; @@ -121,7 +106,7 @@ struct net_device *xpnet_device; * When we are notified of other partitions activating, we add them to * our bitmask of partitions to which we broadcast. */ -static u64 xpnet_broadcast_partitions; +static unsigned long *xpnet_broadcast_partitions; /* protect above */ static DEFINE_SPINLOCK(xpnet_broadcast_lock); @@ -141,16 +126,13 @@ static DEFINE_SPINLOCK(xpnet_broadcast_lock); #define XPNET_DEF_MTU (0x8000UL) /* - * The partition id is encapsulated in the MAC address. The following - * define locates the octet the partid is in. + * The partid is encapsulated in the MAC address beginning in the following + * octet and it consists of two octets. */ -#define XPNET_PARTID_OCTET 1 -#define XPNET_LICENSE_OCTET 2 +#define XPNET_PARTID_OCTET 2 + +/* Define the XPNET debug device structures to be used with dev_dbg() et al */ -/* - * Define the XPNET debug device structure that is to be used with dev_dbg(), - * dev_err(), dev_warn(), and dev_info(). - */ struct device_driver xpnet_dbg_name = { .name = "xpnet" }; @@ -169,7 +151,8 @@ static void xpnet_receive(short partid, int channel, struct xpnet_message *msg) { struct sk_buff *skb; - bte_result_t bret; + void *dst; + enum xp_retval ret; struct xpnet_dev_private *priv = (struct xpnet_dev_private *)xpnet_device->priv; @@ -201,7 +184,7 @@ xpnet_receive(short partid, int channel, struct xpnet_message *msg) /* * The allocated skb has some reserved space. - * In order to use bte_copy, we need to get the + * In order to use xp_remote_memcpy(), we need to get the * skb->data pointer moved forward. */ skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data & @@ -226,26 +209,21 @@ xpnet_receive(short partid, int channel, struct xpnet_message *msg) skb_copy_to_linear_data(skb, &msg->data, (size_t)msg->embedded_bytes); } else { + dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1)); dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t" - "bte_copy(0x%p, 0x%p, %hu)\n", (void *)msg->buf_pa, - (void *)__pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)), - msg->size); - - bret = bte_copy(msg->buf_pa, - __pa((u64)skb->data & ~(L1_CACHE_BYTES - 1)), - msg->size, (BTE_NOTIFY | BTE_WACQUIRE), NULL); + "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", dst, + (void *)msg->buf_pa, msg->size); - if (bret != BTE_SUCCESS) { + ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size); + if (ret != xpSuccess) { /* - * >>> Need better way of cleaning skb. Currently skb - * >>> appears in_use and we can't just call - * >>> dev_kfree_skb. + * !!! Need better way of cleaning skb. Currently skb + * !!! appears in_use and we can't just call + * !!! dev_kfree_skb. */ - dev_err(xpnet, "bte_copy(0x%p, 0x%p, 0x%hx) returned " - "error=0x%x\n", (void *)msg->buf_pa, - (void *)__pa((u64)skb->data & - ~(L1_CACHE_BYTES - 1)), - msg->size, bret); + dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) " + "returned error=0x%x\n", dst, + (void *)msg->buf_pa, msg->size, ret); xpc_received(partid, channel, (void *)msg); @@ -285,9 +263,7 @@ static void xpnet_connection_activity(enum xp_retval reason, short partid, int channel, void *data, void *key) { - long bp; - - DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS); + DBUG_ON(partid < 0 || partid >= xp_max_npartitions); DBUG_ON(channel != XPC_NET_CHANNEL); switch (reason) { @@ -299,31 +275,28 @@ xpnet_connection_activity(enum xp_retval reason, short partid, int channel, case xpConnected: /* connection completed to a partition */ spin_lock_bh(&xpnet_broadcast_lock); - xpnet_broadcast_partitions |= 1UL << (partid - 1); - bp = xpnet_broadcast_partitions; + __set_bit(partid, xpnet_broadcast_partitions); spin_unlock_bh(&xpnet_broadcast_lock); netif_carrier_on(xpnet_device); - dev_dbg(xpnet, "%s connection created to partition %d; " - "xpnet_broadcast_partitions=0x%lx\n", - xpnet_device->name, partid, bp); + dev_dbg(xpnet, "%s connected to partition %d\n", + xpnet_device->name, partid); break; default: spin_lock_bh(&xpnet_broadcast_lock); - xpnet_broadcast_partitions &= ~(1UL << (partid - 1)); - bp = xpnet_broadcast_partitions; + __clear_bit(partid, xpnet_broadcast_partitions); spin_unlock_bh(&xpnet_broadcast_lock); - if (bp == 0) + if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions, + xp_max_npartitions)) { netif_carrier_off(xpnet_device); + } - dev_dbg(xpnet, "%s disconnected from partition %d; " - "xpnet_broadcast_partitions=0x%lx\n", - xpnet_device->name, partid, bp); + dev_dbg(xpnet, "%s disconnected from partition %d\n", + xpnet_device->name, partid); break; - } } @@ -334,8 +307,10 @@ xpnet_dev_open(struct net_device *dev) dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, " "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity, - XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS, - XPNET_MAX_IDLE_KTHREADS); + (unsigned long)XPNET_MSG_SIZE, + (unsigned long)XPNET_MSG_NENTRIES, + (unsigned long)XPNET_MAX_KTHREADS, + (unsigned long)XPNET_MAX_IDLE_KTHREADS); ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL, XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, @@ -426,35 +401,74 @@ xpnet_send_completed(enum xp_retval reason, short partid, int channel, } } +static void +xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg, + u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid) +{ + u8 msg_buffer[XPNET_MSG_SIZE]; + struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer; + u16 msg_size = sizeof(struct xpnet_message); + enum xp_retval ret; + + msg->embedded_bytes = embedded_bytes; + if (unlikely(embedded_bytes != 0)) { + msg->version = XPNET_VERSION_EMBED; + dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", + &msg->data, skb->data, (size_t)embedded_bytes); + skb_copy_from_linear_data(skb, &msg->data, + (size_t)embedded_bytes); + msg_size += embedded_bytes - 1; + } else { + msg->version = XPNET_VERSION; + } + msg->magic = XPNET_MAGIC; + msg->size = end_addr - start_addr; + msg->leadin_ignore = (u64)skb->data - start_addr; + msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); + msg->buf_pa = xp_pa((void *)start_addr); + + dev_dbg(xpnet, "sending XPC message to %d:%d\n" + KERN_DEBUG "msg->buf_pa=0x%lx, msg->size=%u, " + "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", + dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, + msg->leadin_ignore, msg->tailout_ignore); + + atomic_inc(&queued_msg->use_count); + + ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg, + msg_size, xpnet_send_completed, queued_msg); + if (unlikely(ret != xpSuccess)) + atomic_dec(&queued_msg->use_count); +} + /* * Network layer has formatted a packet (skb) and is ready to place it * "on the wire". Prepare and send an xpnet_message to all partitions * which have connected with us and are targets of this packet. * * MAC-NOTE: For the XPNET driver, the MAC address contains the - * destination partition_id. If the destination partition id word - * is 0xff, this packet is to broadcast to all partitions. + * destination partid. If the destination partid octets are 0xffff, + * this packet is to be broadcast to all connected partitions. */ static int xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct xpnet_pending_msg *queued_msg; - enum xp_retval ret; - struct xpnet_message *msg; u64 start_addr, end_addr; - long dp; - u8 second_mac_octet; short dest_partid; - struct xpnet_dev_private *priv; - u16 embedded_bytes; - - priv = (struct xpnet_dev_private *)dev->priv; + struct xpnet_dev_private *priv = (struct xpnet_dev_private *)dev->priv; + u16 embedded_bytes = 0; dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p " "skb->end=0x%p skb->len=%d\n", (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), skb->len); + if (skb->data[0] == 0x33) { + dev_kfree_skb(skb); + return 0; /* nothing needed to be done */ + } + /* * The xpnet_pending_msg tracks how many outstanding * xpc_send_notifies are relying on this skb. When none @@ -466,7 +480,6 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) "packet\n", sizeof(struct xpnet_pending_msg)); priv->stats.tx_errors++; - return -ENOMEM; } @@ -475,7 +488,6 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb)); /* calculate how many bytes to embed in the XPC message */ - embedded_bytes = 0; if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) { /* skb->data does fit so embed */ embedded_bytes = skb->len; @@ -491,82 +503,28 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) atomic_set(&queued_msg->use_count, 1); queued_msg->skb = skb; - second_mac_octet = skb->data[XPNET_PARTID_OCTET]; - if (second_mac_octet == 0xff) { + if (skb->data[0] == 0xff) { /* we are being asked to broadcast to all partitions */ - dp = xpnet_broadcast_partitions; - } else if (second_mac_octet != 0) { - dp = xpnet_broadcast_partitions & - (1UL << (second_mac_octet - 1)); - } else { - /* 0 is an invalid partid. Ignore */ - dp = 0; - } - dev_dbg(xpnet, "destination Partitions mask (dp) = 0x%lx\n", dp); - - /* - * If we wanted to allow promiscuous mode to work like an - * unswitched network, this would be a good point to OR in a - * mask of partitions which should be receiving all packets. - */ - - /* - * Main send loop. - */ - for (dest_partid = 1; dp && dest_partid < XP_MAX_PARTITIONS; - dest_partid++) { + for_each_bit(dest_partid, xpnet_broadcast_partitions, + xp_max_npartitions) { - if (!(dp & (1UL << (dest_partid - 1)))) { - /* not destined for this partition */ - continue; + xpnet_send(skb, queued_msg, start_addr, end_addr, + embedded_bytes, dest_partid); } + } else { + dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1]; + dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8; - /* remove this partition from the destinations mask */ - dp &= ~(1UL << (dest_partid - 1)); - - /* found a partition to send to */ - - ret = xpc_allocate(dest_partid, XPC_NET_CHANNEL, - XPC_NOWAIT, (void **)&msg); - if (unlikely(ret != xpSuccess)) - continue; - - msg->embedded_bytes = embedded_bytes; - if (unlikely(embedded_bytes != 0)) { - msg->version = XPNET_VERSION_EMBED; - dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", - &msg->data, skb->data, (size_t)embedded_bytes); - skb_copy_from_linear_data(skb, &msg->data, - (size_t)embedded_bytes); - } else { - msg->version = XPNET_VERSION; - } - msg->magic = XPNET_MAGIC; - msg->size = end_addr - start_addr; - msg->leadin_ignore = (u64)skb->data - start_addr; - msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); - msg->buf_pa = __pa(start_addr); - - dev_dbg(xpnet, "sending XPC message to %d:%d\n" - KERN_DEBUG "msg->buf_pa=0x%lx, msg->size=%u, " - "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", - dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, - msg->leadin_ignore, msg->tailout_ignore); - - atomic_inc(&queued_msg->use_count); - - ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, msg, - xpnet_send_completed, queued_msg); - if (unlikely(ret != xpSuccess)) { - atomic_dec(&queued_msg->use_count); - continue; + if (dest_partid >= 0 && + dest_partid < xp_max_npartitions && + test_bit(dest_partid, xpnet_broadcast_partitions) != 0) { + + xpnet_send(skb, queued_msg, start_addr, end_addr, + embedded_bytes, dest_partid); } } if (atomic_dec_return(&queued_msg->use_count) == 0) { - dev_dbg(xpnet, "no partitions to receive packet destined for " - "%d\n", dest_partid); - dev_kfree_skb(skb); kfree(queued_msg); } @@ -594,23 +552,28 @@ xpnet_dev_tx_timeout(struct net_device *dev) static int __init xpnet_init(void) { - int i; - u32 license_num; - int result = -ENOMEM; + int result; - if (!ia64_platform_is("sn2")) + if (!is_shub() && !is_uv()) return -ENODEV; dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME); + xpnet_broadcast_partitions = kzalloc(BITS_TO_LONGS(xp_max_npartitions) * + sizeof(long), GFP_KERNEL); + if (xpnet_broadcast_partitions == NULL) + return -ENOMEM; + /* * use ether_setup() to init the majority of our device * structure and then override the necessary pieces. */ xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private), XPNET_DEVICE_NAME, ether_setup); - if (xpnet_device == NULL) + if (xpnet_device == NULL) { + kfree(xpnet_broadcast_partitions); return -ENOMEM; + } netif_carrier_off(xpnet_device); @@ -628,14 +591,10 @@ xpnet_init(void) * MAC addresses. We chose the first octet of the MAC to be unlikely * to collide with any vendor's officially issued MAC. */ - xpnet_device->dev_addr[0] = 0xfe; - xpnet_device->dev_addr[XPNET_PARTID_OCTET] = sn_partition_id; - license_num = sn_partition_serial_number_val(); - for (i = 3; i >= 0; i--) { - xpnet_device->dev_addr[XPNET_LICENSE_OCTET + i] = - license_num & 0xff; - license_num = license_num >> 8; - } + xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */ + + xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = xp_partition_id; + xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (xp_partition_id >> 8); /* * ether_setup() sets this to a multicast device. We are @@ -651,8 +610,10 @@ xpnet_init(void) xpnet_device->features = NETIF_F_NO_CSUM; result = register_netdev(xpnet_device); - if (result != 0) + if (result != 0) { free_netdev(xpnet_device); + kfree(xpnet_broadcast_partitions); + } return result; } @@ -666,8 +627,8 @@ xpnet_exit(void) xpnet_device[0].name); unregister_netdev(xpnet_device); - free_netdev(xpnet_device); + kfree(xpnet_broadcast_partitions); } module_exit(xpnet_exit); |