diff options
Diffstat (limited to 'arch/x86/mach-voyager/voyager_smp.c')
| -rw-r--r-- | arch/x86/mach-voyager/voyager_smp.c | 1952 |
1 files changed, 1952 insertions, 0 deletions
diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c new file mode 100644 index 00000000000..b87f8548e75 --- /dev/null +++ b/arch/x86/mach-voyager/voyager_smp.c @@ -0,0 +1,1952 @@ +/* -*- mode: c; c-basic-offset: 8 -*- */ + +/* Copyright (C) 1999,2001 + * + * Author: J.E.J.Bottomley@HansenPartnership.com + * + * linux/arch/i386/kernel/voyager_smp.c + * + * This file provides all the same external entries as smp.c but uses + * the voyager hal to provide the functionality + */ +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/kernel_stat.h> +#include <linux/delay.h> +#include <linux/mc146818rtc.h> +#include <linux/cache.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/bootmem.h> +#include <linux/completion.h> +#include <asm/desc.h> +#include <asm/voyager.h> +#include <asm/vic.h> +#include <asm/mtrr.h> +#include <asm/pgalloc.h> +#include <asm/tlbflush.h> +#include <asm/arch_hooks.h> + +/* TLB state -- visible externally, indexed physically */ +DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate) ____cacheline_aligned = { &init_mm, 0 }; + +/* CPU IRQ affinity -- set to all ones initially */ +static unsigned long cpu_irq_affinity[NR_CPUS] __cacheline_aligned = { [0 ... NR_CPUS-1] = ~0UL }; + +/* per CPU data structure (for /proc/cpuinfo et al), visible externally + * indexed physically */ +struct cpuinfo_x86 cpu_data[NR_CPUS] __cacheline_aligned; +EXPORT_SYMBOL(cpu_data); + +/* physical ID of the CPU used to boot the system */ +unsigned char boot_cpu_id; + +/* The memory line addresses for the Quad CPIs */ +struct voyager_qic_cpi *voyager_quad_cpi_addr[NR_CPUS] __cacheline_aligned; + +/* The masks for the Extended VIC processors, filled in by cat_init */ +__u32 voyager_extended_vic_processors = 0; + +/* Masks for the extended Quad processors which cannot be VIC booted */ +__u32 voyager_allowed_boot_processors = 0; + +/* The mask for the Quad Processors (both extended and non-extended) */ +__u32 voyager_quad_processors = 0; + +/* Total count of live CPUs, used in process.c to display + * the CPU information and in irq.c for the per CPU irq + * activity count. Finally exported by i386_ksyms.c */ +static int voyager_extended_cpus = 1; + +/* Have we found an SMP box - used by time.c to do the profiling + interrupt for timeslicing; do not set to 1 until the per CPU timer + interrupt is active */ +int smp_found_config = 0; + +/* Used for the invalidate map that's also checked in the spinlock */ +static volatile unsigned long smp_invalidate_needed; + +/* Bitmask of currently online CPUs - used by setup.c for + /proc/cpuinfo, visible externally but still physical */ +cpumask_t cpu_online_map = CPU_MASK_NONE; +EXPORT_SYMBOL(cpu_online_map); + +/* Bitmask of CPUs present in the system - exported by i386_syms.c, used + * by scheduler but indexed physically */ +cpumask_t phys_cpu_present_map = CPU_MASK_NONE; + + +/* The internal functions */ +static void send_CPI(__u32 cpuset, __u8 cpi); +static void ack_CPI(__u8 cpi); +static int ack_QIC_CPI(__u8 cpi); +static void ack_special_QIC_CPI(__u8 cpi); +static void ack_VIC_CPI(__u8 cpi); +static void send_CPI_allbutself(__u8 cpi); +static void mask_vic_irq(unsigned int irq); +static void unmask_vic_irq(unsigned int irq); +static unsigned int startup_vic_irq(unsigned int irq); +static void enable_local_vic_irq(unsigned int irq); +static void disable_local_vic_irq(unsigned int irq); +static void before_handle_vic_irq(unsigned int irq); +static void after_handle_vic_irq(unsigned int irq); +static void set_vic_irq_affinity(unsigned int irq, cpumask_t mask); +static void ack_vic_irq(unsigned int irq); +static void vic_enable_cpi(void); +static void do_boot_cpu(__u8 cpuid); +static void do_quad_bootstrap(void); + +int hard_smp_processor_id(void); +int safe_smp_processor_id(void); + +/* Inline functions */ +static inline void +send_one_QIC_CPI(__u8 cpu, __u8 cpi) +{ + voyager_quad_cpi_addr[cpu]->qic_cpi[cpi].cpi = + (smp_processor_id() << 16) + cpi; +} + +static inline void +send_QIC_CPI(__u32 cpuset, __u8 cpi) +{ + int cpu; + + for_each_online_cpu(cpu) { + if(cpuset & (1<<cpu)) { +#ifdef VOYAGER_DEBUG + if(!cpu_isset(cpu, cpu_online_map)) + VDEBUG(("CPU%d sending cpi %d to CPU%d not in cpu_online_map\n", hard_smp_processor_id(), cpi, cpu)); +#endif + send_one_QIC_CPI(cpu, cpi - QIC_CPI_OFFSET); + } + } +} + +static inline void +wrapper_smp_local_timer_interrupt(void) +{ + irq_enter(); + smp_local_timer_interrupt(); + irq_exit(); +} + +static inline void +send_one_CPI(__u8 cpu, __u8 cpi) +{ + if(voyager_quad_processors & (1<<cpu)) + send_one_QIC_CPI(cpu, cpi - QIC_CPI_OFFSET); + else + send_CPI(1<<cpu, cpi); +} + +static inline void +send_CPI_allbutself(__u8 cpi) +{ + __u8 cpu = smp_processor_id(); + __u32 mask = cpus_addr(cpu_online_map)[0] & ~(1 << cpu); + send_CPI(mask, cpi); +} + +static inline int +is_cpu_quad(void) +{ + __u8 cpumask = inb(VIC_PROC_WHO_AM_I); + return ((cpumask & QUAD_IDENTIFIER) == QUAD_IDENTIFIER); +} + +static inline int +is_cpu_extended(void) +{ + __u8 cpu = hard_smp_processor_id(); + + return(voyager_extended_vic_processors & (1<<cpu)); +} + +static inline int +is_cpu_vic_boot(void) +{ + __u8 cpu = hard_smp_processor_id(); + + return(voyager_extended_vic_processors + & voyager_allowed_boot_processors & (1<<cpu)); +} + + +static inline void +ack_CPI(__u8 cpi) +{ + switch(cpi) { + case VIC_CPU_BOOT_CPI: + if(is_cpu_quad() && !is_cpu_vic_boot()) + ack_QIC_CPI(cpi); + else + ack_VIC_CPI(cpi); + break; + case VIC_SYS_INT: + case VIC_CMN_INT: + /* These are slightly strange. Even on the Quad card, + * They are vectored as VIC CPIs */ + if(is_cpu_quad()) + ack_special_QIC_CPI(cpi); + else + ack_VIC_CPI(cpi); + break; + default: + printk("VOYAGER ERROR: CPI%d is in common CPI code\n", cpi); + break; + } +} + +/* local variables */ + +/* The VIC IRQ descriptors -- these look almost identical to the + * 8259 IRQs except that masks and things must be kept per processor + */ +static struct irq_chip vic_chip = { + .name = "VIC", + .startup = startup_vic_irq, + .mask = mask_vic_irq, + .unmask = unmask_vic_irq, + .set_affinity = set_vic_irq_affinity, +}; + +/* used to count up as CPUs are brought on line (starts at 0) */ +static int cpucount = 0; + +/* steal a page from the bottom of memory for the trampoline and + * squirrel its address away here. This will be in kernel virtual + * space */ +static __u32 trampoline_base; + +/* The per cpu profile stuff - used in smp_local_timer_interrupt */ +static DEFINE_PER_CPU(int, prof_multiplier) = 1; +static DEFINE_PER_CPU(int, prof_old_multiplier) = 1; +static DEFINE_PER_CPU(int, prof_counter) = 1; + +/* the map used to check if a CPU has booted */ +static __u32 cpu_booted_map; + +/* the synchronize flag used to hold all secondary CPUs spinning in + * a tight loop until the boot sequence is ready for them */ +static cpumask_t smp_commenced_mask = CPU_MASK_NONE; + +/* This is for the new dynamic CPU boot code */ +cpumask_t cpu_callin_map = CPU_MASK_NONE; +cpumask_t cpu_callout_map = CPU_MASK_NONE; +EXPORT_SYMBOL(cpu_callout_map); +cpumask_t cpu_possible_map = CPU_MASK_NONE; +EXPORT_SYMBOL(cpu_possible_map); + +/* The per processor IRQ masks (these are usually kept in sync) */ +static __u16 vic_irq_mask[NR_CPUS] __cacheline_aligned; + +/* the list of IRQs to be enabled by the VIC_ENABLE_IRQ_CPI */ +static __u16 vic_irq_enable_mask[NR_CPUS] __cacheline_aligned = { 0 }; + +/* Lock for enable/disable of VIC interrupts */ +static __cacheline_aligned DEFINE_SPINLOCK(vic_irq_lock); + +/* The boot processor is correctly set up in PC mode when it + * comes up, but the secondaries need their master/slave 8259 + * pairs initializing correctly */ + +/* Interrupt counters (per cpu) and total - used to try to + * even up the interrupt handling routines */ +static long vic_intr_total = 0; +static long vic_intr_count[NR_CPUS] __cacheline_aligned = { 0 }; +static unsigned long vic_tick[NR_CPUS] __cacheline_aligned = { 0 }; + +/* Since we can only use CPI0, we fake all the other CPIs */ +static unsigned long vic_cpi_mailbox[NR_CPUS] __cacheline_aligned; + +/* debugging routine to read the isr of the cpu's pic */ +static inline __u16 +vic_read_isr(void) +{ + __u16 isr; + + outb(0x0b, 0xa0); + isr = inb(0xa0) << 8; + outb(0x0b, 0x20); + isr |= inb(0x20); + + return isr; +} + +static __init void +qic_setup(void) +{ + if(!is_cpu_quad()) { + /* not a quad, no setup */ + return; + } + outb(QIC_DEFAULT_MASK0, QIC_MASK_REGISTER0); + outb(QIC_CPI_ENABLE, QIC_MASK_REGISTER1); + + if(is_cpu_extended()) { + /* the QIC duplicate of the VIC base register */ + outb(VIC_DEFAULT_CPI_BASE, QIC_VIC_CPI_BASE_REGISTER); + outb(QIC_DEFAULT_CPI_BASE, QIC_CPI_BASE_REGISTER); + + /* FIXME: should set up the QIC timer and memory parity + * error vectors here */ + } +} + +static __init void +vic_setup_pic(void) +{ + outb(1, VIC_REDIRECT_REGISTER_1); + /* clear the claim registers for dynamic routing */ + outb(0, VIC_CLAIM_REGISTER_0); + outb(0, VIC_CLAIM_REGISTER_1); + + outb(0, VIC_PRIORITY_REGISTER); + /* Set the Primary and Secondary Microchannel vector + * bases to be the same as the ordinary interrupts + * + * FIXME: This would be more efficient using separate + * vectors. */ + outb(FIRST_EXTERNAL_VECTOR, VIC_PRIMARY_MC_BASE); + outb(FIRST_EXTERNAL_VECTOR, VIC_SECONDARY_MC_BASE); + /* Now initiallise the master PIC belonging to this CPU by + * sending the four ICWs */ + + /* ICW1: level triggered, ICW4 needed */ + outb(0x19, 0x20); + + /* ICW2: vector base */ + outb(FIRST_EXTERNAL_VECTOR, 0x21); + + /* ICW3: slave at line 2 */ + outb(0x04, 0x21); + + /* ICW4: 8086 mode */ + outb(0x01, 0x21); + + /* now the same for the slave PIC */ + + /* ICW1: level trigger, ICW4 needed */ + outb(0x19, 0xA0); + + /* ICW2: slave vector base */ + outb(FIRST_EXTERNAL_VECTOR + 8, 0xA1); + + /* ICW3: slave ID */ + outb(0x02, 0xA1); + + /* ICW4: 8086 mode */ + outb(0x01, 0xA1); +} + +static void +do_quad_bootstrap(void) +{ + if(is_cpu_quad() && is_cpu_vic_boot()) { + int i; + unsigned long flags; + __u8 cpuid = hard_smp_processor_id(); + + local_irq_save(flags); + + for(i = 0; i<4; i++) { + /* FIXME: this would be >>3 &0x7 on the 32 way */ + if(((cpuid >> 2) & 0x03) == i) + /* don't lower our own mask! */ + continue; + + /* masquerade as local Quad CPU */ + outb(QIC_CPUID_ENABLE | i, QIC_PROCESSOR_ID); + /* enable the startup CPI */ + outb(QIC_BOOT_CPI_MASK, QIC_MASK_REGISTER1); + /* restore cpu id */ + outb(0, QIC_PROCESSOR_ID); + } + local_irq_restore(flags); + } +} + + +/* Set up all the basic stuff: read the SMP config and make all the + * SMP information reflect only the boot cpu. All others will be + * brought on-line later. */ +void __init +find_smp_config(void) +{ + int i; + + boot_cpu_id = hard_smp_processor_id(); + + printk("VOYAGER SMP: Boot cpu is %d\n", boot_cpu_id); + + /* initialize the CPU structures (moved from smp_boot_cpus) */ + for(i=0; i<NR_CPUS; i++) { + cpu_irq_affinity[i] = ~0; + } + cpu_online_map = cpumask_of_cpu(boot_cpu_id); + + /* The boot CPU must be extended */ + voyager_extended_vic_processors = 1<<boot_cpu_id; + /* initially, all of the first 8 cpu's can boot */ + voyager_allowed_boot_processors = 0xff; + /* set up everything for just this CPU, we can alter + * this as we start the other CPUs later */ + /* now get the CPU disposition from the extended CMOS */ + cpus_addr(phys_cpu_present_map)[0] = voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK); + cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 1) << 8; + cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 2) << 16; + cpus_addr(phys_cpu_present_map)[0] |= voyager_extended_cmos_read(VOYAGER_PROCESSOR_PRESENT_MASK + 3) << 24; + cpu_possible_map = phys_cpu_present_map; + printk("VOYAGER SMP: phys_cpu_present_map = 0x%lx\n", cpus_addr(phys_cpu_present_map)[0]); + /* Here we set up the VIC to enable SMP */ + /* enable the CPIs by writing the base vector to their register */ + outb(VIC_DEFAULT_CPI_BASE, VIC_CPI_BASE_REGISTER); + outb(1, VIC_REDIRECT_REGISTER_1); + /* set the claim registers for static routing --- Boot CPU gets + * all interrupts untill all other CPUs started */ + outb(0xff, VIC_CLAIM_REGISTER_0); + outb(0xff, VIC_CLAIM_REGISTER_1); + /* Set the Primary and Secondary Microchannel vector + * bases to be the same as the ordinary interrupts + * + * FIXME: This would be more efficient using separate + * vectors. */ + outb(FIRST_EXTERNAL_VECTOR, VIC_PRIMARY_MC_BASE); + outb(FIRST_EXTERNAL_VECTOR, VIC_SECONDARY_MC_BASE); + + /* Finally tell the firmware that we're driving */ + outb(inb(VOYAGER_SUS_IN_CONTROL_PORT) | VOYAGER_IN_CONTROL_FLAG, + VOYAGER_SUS_IN_CONTROL_PORT); + + current_thread_info()->cpu = boot_cpu_id; + x86_write_percpu(cpu_number, boot_cpu_id); +} + +/* + * The bootstrap kernel entry code has set these up. Save them + * for a given CPU, id is physical */ +void __init +smp_store_cpu_info(int id) +{ + struct cpuinfo_x86 *c=&cpu_data[id]; + + *c = boot_cpu_data; + + identify_secondary_cpu(c); +} + +/* set up the trampoline and return the physical address of the code */ +static __u32 __init +setup_trampoline(void) +{ + /* these two are global symbols in trampoline.S */ + extern __u8 trampoline_end[]; + extern __u8 trampoline_data[]; + + memcpy((__u8 *)trampoline_base, trampoline_data, + trampoline_end - trampoline_data); + return virt_to_phys((__u8 *)trampoline_base); +} + +/* Routine initially called when a non-boot CPU is brought online */ +static void __init +start_secondary(void *unused) +{ + __u8 cpuid = hard_smp_processor_id(); + /* external functions not defined in the headers */ + extern void calibrate_delay(void); + + cpu_init(); + + /* OK, we're in the routine */ + ack_CPI(VIC_CPU_BOOT_CPI); + + /* setup the 8259 master slave pair belonging to this CPU --- + * we won't actually receive any until the boot CPU + * relinquishes it's static routing mask */ + vic_setup_pic(); + + qic_setup(); + + if(is_cpu_quad() && !is_cpu_vic_boot()) { + /* clear the boot CPI */ + __u8 dummy; + + dummy = voyager_quad_cpi_addr[cpuid]->qic_cpi[VIC_CPU_BOOT_CPI].cpi; + printk("read dummy %d\n", dummy); + } + + /* lower the mask to receive CPIs */ + vic_enable_cpi(); + + VDEBUG(("VOYAGER SMP: CPU%d, stack at about %p\n", cpuid, &cpuid)); + + /* enable interrupts */ + local_irq_enable(); + + /* get our bogomips */ + calibrate_delay(); + + /* save our processor parameters */ + smp_store_cpu_info(cpuid); + + /* if we're a quad, we may need to bootstrap other CPUs */ + do_quad_bootstrap(); + + /* FIXME: this is rather a poor hack to prevent the CPU + * activating softirqs while it's supposed to be waiting for + * permission to proceed. Without this, the new per CPU stuff + * in the softirqs will fail */ + local_irq_disable(); + cpu_set(cpuid, cpu_callin_map); + + /* signal that we're done */ + cpu_booted_map = 1; + + while (!cpu_isset(cpuid, smp_commenced_mask)) + rep_nop(); + local_irq_enable(); + + local_flush_tlb(); + + cpu_set(cpuid, cpu_online_map); + wmb(); + cpu_idle(); +} + + +/* Routine to kick start the given CPU and wait for it to report ready + * (or timeout in startup). When this routine returns, the requested + * CPU is either fully running and configured or known to be dead. + * + * We call this routine sequentially 1 CPU at a time, so no need for + * locking */ + +static void __init +do_boot_cpu(__u8 cpu) +{ + struct task_struct *idle; + int timeout; + unsigned long flags; + int quad_boot = (1<<cpu) & voyager_quad_processors + & ~( voyager_extended_vic_processors + & voyager_allowed_boot_processors); + + /* This is an area in head.S which was used to set up the + * initial kernel stack. We need to alter this to give the + * booting CPU a new stack (taken from its idle process) */ + extern struct { + __u8 *esp; + unsigned short ss; + } stack_start; + /* This is the format of the CPI IDT gate (in real mode) which + * we're hijacking to boot the CPU */ + union IDTFormat { + struct seg { + __u16 Offset; + __u16 Segment; + } idt; + __u32 val; + } hijack_source; + + __u32 *hijack_vector; + __u32 start_phys_address = setup_trampoline(); + + /* There's a clever trick to this: The linux trampoline is + * compiled to begin at absolute location zero, so make the + * address zero but have the data segment selector compensate + * for the actual address */ + hijack_source.idt.Offset = start_phys_address & 0x000F; + hijack_source.idt.Segment = (start_phys_address >> 4) & 0xFFFF; + + cpucount++; + alternatives_smp_switch(1); + + idle = fork_idle(cpu); + if(IS_ERR(idle)) + panic("failed fork for CPU%d", cpu); + idle->thread.eip = (unsigned long) start_secondary; + /* init_tasks (in sched.c) is indexed logically */ + stack_start.esp = (void *) idle->thread.esp; + + init_gdt(cpu); + per_cpu(current_task, cpu) = idle; + early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); + irq_ctx_init(cpu); + + /* Note: Don't modify initial ss override */ + VDEBUG(("VOYAGER SMP: Booting CPU%d at 0x%lx[%x:%x], stack %p\n", cpu, + (unsigned long)hijack_source.val, hijack_source.idt.Segment, + hijack_source.idt.Offset, stack_start.esp)); + + /* init lowmem identity mapping */ + clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, + min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS)); + flush_tlb_all(); + + if(quad_boot) { + printk("CPU %d: non extended Quad boot\n", cpu); + hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_CPI + QIC_DEFAULT_CPI_BASE)*4); + *hijack_vector = hijack_source.val; + } else { + printk("CPU%d: extended VIC boot\n", cpu); + hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_CPI + VIC_DEFAULT_CPI_BASE)*4); + *hijack_vector = hijack_source.val; + /* VIC errata, may also receive interrupt at this address */ + hijack_vector = (__u32 *)phys_to_virt((VIC_CPU_BOOT_ERRATA_CPI + VIC_DEFAULT_CPI_BASE)*4); + *hijack_vector = hijack_source.val; + } + /* All non-boot CPUs start with interrupts fully masked. Need + * to lower the mask of the CPI we're about to send. We do + * this in the VIC by masquerading as the processor we're + * about to boot and lowering its interrupt mask */ + local_irq_save(flags); + if(quad_boot) { + send_one_QIC_CPI(cpu, VIC_CPU_BOOT_CPI); + } else { + outb(VIC_CPU_MASQUERADE_ENABLE | cpu, VIC_PROCESSOR_ID); + /* here we're altering registers belonging to `cpu' */ + + outb(VIC_BOOT_INTERRUPT_MASK, 0x21); + /* now go back to our original identity */ + outb(boot_cpu_id, VIC_PROCESSOR_ID); + + /* and boot the CPU */ + + send_CPI((1<<cpu), VIC_CPU_BOOT_CPI); + } + cpu_booted_map = 0; + local_irq_restore(flags); + + /* now wait for it to become ready (or timeout) */ + for(timeout = 0; timeout < 50000; timeout++) { + if(cpu_booted_map) + break; + udelay(100); + } + /* reset the page table */ + zap_low_mappings(); + + if (cpu_booted_map) { + VDEBUG(("CPU%d: Booted successfully, back in CPU %d\n", + cpu, smp_processor_id())); + + printk("CPU%d: ", cpu); + print_cpu_info(&cpu_data[cpu]); + wmb(); + cpu_set(cpu, cpu_callout_map); + cpu_set(cpu, cpu_present_map); + } + else { + printk("CPU%d FAILED TO BOOT: ", cpu); + if (*((volatile unsigned char *)phys_to_virt(start_phys_address))==0xA5) + printk("Stuck.\n"); + else + printk("Not responding.\n"); + + cpucount--; + } +} + +void __init +smp_boot_cpus(void) +{ + int i; + + /* CAT BUS initialisation must be done after the memory */ + /* FIXME: The L4 has a catbus too, it just needs to be + * accessed in a totally different way */ + if(voyager_level == 5) { + voyager_cat_init(); + + /* now that the cat has probed the Voyager System Bus, sanity + * check the cpu map */ + if( ((voyager_quad_processors | voyager_extended_vic_processors) + & cpus_addr(phys_cpu_present_map)[0]) != cpus_addr(phys_cpu_present_map)[0]) { + /* should panic */ + printk("\n\n***WARNING*** Sanity check of CPU present map FAILED\n"); + } + } else if(voyager_level == 4) + voyager_extended_vic_processors = cpus_addr(phys_cpu_present_map)[0]; + + /* this sets up the idle task to run on the current cpu */ + voyager_extended_cpus = 1; + /* Remove the global_irq_holder setting, it triggers a BUG() on + * schedule at the moment */ + //global_irq_holder = boot_cpu_id; + + /* FIXME: Need to do something about this but currently only works + * on CPUs with a tsc which none of mine have. + smp_tune_scheduling(); + */ + smp_store_cpu_info(boot_cpu_id); + printk("CPU%d: ", boot_cpu_id); + print_cpu_info(&cpu_data[boot_cpu_id]); + + if(is_cpu_quad()) { + /* booting on a Quad CPU */ + printk("VOYAGER SMP: Boot CPU is Quad\n"); + qic_setup(); + do_quad_bootstrap(); + } + + /* enable our own CPIs */ + vic_enable_cpi(); + + cpu_set(boot_cpu_id, cpu_online_map); + cpu_set(boot_cpu_id, cpu_callout_map); + + /* loop over all the extended VIC CPUs and boot them. The + * Quad CPUs must be bootstrapped by their extended VIC cpu */ + for(i = 0; i < NR_CPUS; i++) { + if(i == boot_cpu_id || !cpu_isset(i, phys_cpu_present_map)) + continue; + do_boot_cpu(i); + /* This udelay seems to be needed for the Quad boots + * don't remove unless you know what you're doing */ + udelay(1000); + } + /* we could compute the total bogomips here, but why bother?, + * Code added from smpboot.c */ + { + unsigned long bogosum = 0; + for (i = 0; i < NR_CPUS; i++) + if (cpu_isset(i, cpu_online_map)) + bogosum += cpu_data[i].loops_per_jiffy; + printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", + cpucount+1, + bogosum/(500000/HZ), + (bogosum/(5000/HZ))%100); + } + voyager_extended_cpus = hweight32(voyager_extended_vic_processors); + printk("VOYAGER: Extended (interrupt handling CPUs): %d, non-extended: %d\n", voyager_extended_cpus, num_booting_cpus() - voyager_extended_cpus); + /* that's it, switch to symmetric mode */ + outb(0, VIC_PRIORITY_REGISTER); + outb(0, VIC_CLAIM_REGISTER_0); + outb(0, VIC_CLAIM_REGISTER_1); + + VDEBUG(("VOYAGER SMP: Booted with %d CPUs\n", num_booting_cpus())); +} + +/* Reload the secondary CPUs task structure (this function does not + * return ) */ +void __init +initialize_secondary(void) +{ +#if 0 + // AC kernels only + set_current(hard_get_current()); +#endif + + /* + * We don't actually need to load the full TSS, + * basically just the stack pointer and the eip. + */ + + asm volatile( + "movl %0,%%esp\n\t" + "jmp *%1" + : + :"r" (current->thread.esp),"r" (current->thread.eip)); +} + +/* handle a Voyager SYS_INT -- If we don't, the base board will + * panic the system. + * + * System interrupts occur because some problem was detected on the + * various busses. To find out what you have to probe all the + * hardware via the CAT bus. FIXME: At the moment we do nothing. */ +fastcall void +smp_vic_sys_interrupt(struct pt_regs *regs) +{ + ack_CPI(VIC_SYS_INT); + printk("Voyager SYSTEM INTERRUPT\n"); +} + +/* Handle a voyager CMN_INT; These interrupts occur either because of + * a system status change or because a single bit memory error + * occurred. FIXME: At the moment, ignore all this. */ +fastcall void +smp_vic_cmn_interrupt(struct pt_regs *regs) +{ + static __u8 in_cmn_int = 0; + static DEFINE_SPINLOCK(cmn_int_lock); + + /* common ints are broadcast, so make sure we only do this once */ + _raw_spin_lock(&cmn_int_lock); + if(in_cmn_int) + goto unlock_end; + + in_cmn_int++; + _raw_spin_unlock(&cmn_int_lock); + + VDEBUG(("Voyager COMMON INTERRUPT\n")); + + if(voyager_level == 5) + voyager_cat_do_common_interrupt(); + + _raw_spin_lock(&cmn_int_lock); + in_cmn_int = 0; + unlock_end: + _raw_spin_unlock(&cmn_int_lock); + ack_CPI(VIC_CMN_INT); +} + +/* + * Reschedule call back. Nothing to do, all the work is done + * automatically when we return from the interrupt. */ +static void +smp_reschedule_interrupt(void) +{ + /* do nothing */ +} + +static struct mm_struct * flush_mm; +static unsigned long flush_va; +static DEFINE_SPINLOCK(tlbstate_lock); +#define FLUSH_ALL 0xffffffff + +/* + * We cannot call mmdrop() because we are in interrupt context, + * instead update mm->cpu_vm_mask. + * + * We need to reload %cr3 since the page tables may be going + * away from under us.. + */ +static inline void +leave_mm (unsigned long cpu) +{ + if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) + BUG(); + cpu_clear(cpu, per_cpu(cpu_tlbstate, cpu).active_mm->cpu_vm_mask); + load_cr3(swapper_pg_dir); +} + + +/* + * Invalidate call-back + */ +static void +smp_invalidate_interrupt(void) +{ + __u8 cpu = smp_processor_id(); + + if (!test_bit(cpu, &smp_invalidate_needed)) + return; + /* This will flood messages. Don't uncomment unless you see + * Problems with cross cpu invalidation + VDEBUG(("VOYAGER SMP: CPU%d received INVALIDATE_CPI\n", + smp_processor_id())); + */ + + if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) { + if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) { + if (flush_va == FLUSH_ALL) + local_flush_tlb(); + else + __flush_tlb_one(flush_va); + } else + leave_mm(cpu); + } + smp_mb__before_clear_bit(); + clear_bit(cpu, &smp_invalidate_needed); + smp_mb__after_clear_bit(); +} + +/* All the new flush operations for 2.4 */ + + +/* This routine is called with a physical cpu mask */ +static void +voyager_flush_tlb_others (unsigned long cpumask, struct mm_struct *mm, + unsigned long va) +{ + int stuck = 50000; + + if (!cpumask) + BUG(); + if ((cpumask & cpus_addr(cpu_online_map)[0]) != cpumask) + BUG(); + if (cpumask & (1 << smp_processor_id())) + BUG(); + if (!mm) + BUG(); + + spin_lock(&tlbstate_lock); + + flush_mm = mm; + flush_va = va; + atomic_set_mask(cpumask, &smp_invalidate_needed); + /* + * We have to send the CPI only to + * CPUs affected. + */ + send_CPI(cpumask, VIC_INVALIDATE_CPI); + + while (smp_invalidate_needed) { + mb(); + if(--stuck == 0) { + printk("***WARNING*** Stuck doing invalidate CPI (CPU%d)\n", smp_processor_id()); + break; + } + } + + /* Uncomment only to debug invalidation problems + VDEBUG(("VOYAGER SMP: Completed invalidate CPI (CPU%d)\n", cpu)); + */ + + flush_mm = NULL; + flush_va = 0; + spin_unlock(&tlbstate_lock); +} + +void +flush_tlb_current_task(void) +{ + struct mm_struct *mm = current->mm; + unsigned long cpu_mask; + + preempt_disable(); + + cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id()); + local_flush_tlb(); + if (cpu_mask) + voyager_flush_tlb_others(cpu_mask, mm, FLUSH_ALL); + + preempt_enable(); +} + + +void +flush_tlb_mm (struct mm_struct * mm) +{ + unsigned long cpu_mask; + + preempt_disable(); + + cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id()); + + if (current->active_mm == mm) { + if (current->mm) + local_flush_tlb(); + else + leave_mm(smp_processor_id()); + } + if (cpu_mask) + voyager_flush_tlb_others(cpu_mask, mm, FLUSH_ALL); + + preempt_enable(); +} + +void flush_tlb_page(struct vm_area_struct * vma, unsigned long va) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long cpu_mask; + + preempt_disable(); + + cpu_mask = cpus_addr(mm->cpu_vm_mask)[0] & ~(1 << smp_processor_id()); + if (current->active_mm == mm) { + if(current->mm) + __flush_tlb_one(va); + else + leave_mm(smp_processor_id()); + } + + if (cpu_mask) + voyager_flush_tlb_others(cpu_mask, mm, va); + + preempt_enable(); +} +EXPORT_SYMBOL(flush_tlb_page); + +/* enable the requested IRQs */ +static void +smp_enable_irq_interrupt(void) +{ + __u8 irq; + __u8 cpu = get_cpu(); + + VDEBUG(("VOYAGER SMP: CPU%d enabling irq mask 0x%x\n", cpu, + vic_irq_enable_mask[cpu])); + + spin_lock(&vic_irq_lock); + for(irq = 0; irq < 16; irq++) { + if(vic_irq_enable_mask[cpu] & (1<<irq)) + enable_local_vic_irq(irq); + } + vic_irq_enable_mask[cpu] = 0; + spin_unlock(&vic_irq_lock); + + put_cpu_no_resched(); +} + +/* + * CPU halt call-back + */ +static void +smp_stop_cpu_function(void *dummy) +{ + VDEBUG(("VOYAGER SMP: CPU%d is STOPPING\n", smp_processor_id())); + cpu_clear(smp_processor_id(), cpu_online_map); + local_irq_disable(); + for(;;) + halt(); +} + +static DEFINE_SPINLOCK(call_lock); + +struct call_data_struct { + void (*func) (void *info); + void *info; + volatile unsigned long started; + volatile unsigned long finished; + int wait; +}; + +static struct call_data_struct * call_data; + +/* execute a thread on a new CPU. The function to be called must be + * previously set up. This is used to schedule a function for + * execution on all CPU's - set up the function then broadcast a + * function_interrupt CPI to come here on each CPU */ +static void +smp_call_function_interrupt(void) +{ + void (*func) (void *info) = call_data->func; + void *info = call_data->info; + /* must take copy of wait because call_data may be replaced + * unless the function is waiting for us to finish */ + int wait = call_data->wait; + __u8 cpu = smp_processor_id(); + + /* + * Notify initiating CPU that I've grabbed the data and am + * about to execute the function + */ + mb(); + if(!test_and_clear_bit(cpu, &call_data->started)) { + /* If the bit wasn't set, this could be a replay */ + printk(KERN_WARNING "VOYAGER SMP: CPU %d received call funtion with no call pending\n", cpu); + return; + } + /* + * At this point the info structure may be out of scope unless wait==1 + */ + irq_enter(); + (*func)(info); + irq_exit(); + if (wait) { + mb(); + clear_bit(cpu, &call_data->finished); + } +} + +static int +voyager_smp_call_function_mask (cpumask_t cpumask, + void (*func) (void *info), void *info, + int wait) +{ + struct call_data_struct data; + u32 mask = cpus_addr(cpumask)[0]; + + mask &= ~(1<<smp_processor_id()); + + if (!mask) + return 0; + + /* Can deadlock when called with interrupts disabled */ + WARN_ON(irqs_disabled()); + + data.func = func; + data.info = info; + data.started = mask; + data.wait = wait; + if (wait) + data.finished = mask; + + spin_lock(&call_lock); + call_data = &data; + wmb(); + /* Send a message to all other CPUs and wait for them to respond */ + send_CPI(mask, VIC_CALL_FUNCTION_CPI); + + /* Wait for response */ + while (data.started) + barrier(); + + if (wait) + while (data.finished) + barrier(); + + spin_unlock(&call_lock); + + return 0; +} + +/* Sorry about the name. In an APIC based system, the APICs + * themselves are programmed to send a timer interrupt. This is used + * by linux to reschedule the processor. Voyager doesn't have this, + * so we use the system clock to interrupt one processor, which in + * turn, broadcasts a timer CPI to all the others --- we receive that + * CPI here. We don't use this actually for counting so losing + * ticks doesn't matter + * + * FIXME: For those CPU's which actually have a local APIC, we could + * try to use it to trigger this interrupt instead of having to + * broadcast the timer tick. Unfortunately, all my pentium DYADs have + * no local APIC, so I can't do this + * + * This function is currently a placeholder and is unused in the code */ +fastcall void +smp_apic_timer_interrupt(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + wrapper_smp_local_timer_interrupt(); + set_irq_regs(old_regs); +} + +/* All of the QUAD interrupt GATES */ +fastcall void +smp_qic_timer_interrupt(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + ack_QIC_CPI(QIC_TIMER_CPI); + wrapper_smp_local_timer_interrupt(); + set_irq_regs(old_regs); +} + +fastcall void +smp_qic_invalidate_interrupt(struct pt_regs *regs) +{ + ack_QIC_CPI(QIC_INVALIDATE_CPI); + smp_invalidate_interrupt(); +} + +fastcall void +smp_qic_reschedule_interrupt(struct pt_regs *regs) +{ + ack_QIC_CPI(QIC_RESCHEDULE_CPI); + smp_reschedule_interrupt(); +} + +fastcall void +smp_qic_enable_irq_interrupt(struct pt_regs *regs) +{ + ack_QIC_CPI(QIC_ENABLE_IRQ_CPI); + smp_enable_irq_interrupt(); +} + +fastcall void +smp_qic_call_function_interrupt(struct pt_regs *regs) +{ + ack_QIC_CPI(QIC_CALL_FUNCTION_CPI); + smp_call_function_interrupt(); +} + +fastcall void +smp_vic_cpi_interrupt(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + __u8 cpu = smp_processor_id(); + + if(is_cpu_quad()) + ack_QIC_CPI(VIC_CPI_LEVEL0); + else + ack_VIC_CPI(VIC_CPI_LEVEL0); + + if(test_and_clear_bit(VIC_TIMER_CPI, &vic_cpi_mailbox[cpu])) + wrapper_smp_local_timer_interrupt(); + if(test_and_clear_bit(VIC_INVALIDATE_CPI, &vic_cpi_mailbox[cpu])) + smp_invalidate_interrupt(); + if(test_and_clear_bit(VIC_RESCHEDULE_CPI, &vic_cpi_mailbox[cpu])) + smp_reschedule_interrupt(); + if(test_and_clear_bit(VIC_ENABLE_IRQ_CPI, &vic_cpi_mailbox[cpu])) + smp_enable_irq_interrupt(); + if(test_and_clear_bit(VIC_CALL_FUNCTION_CPI, &vic_cpi_mailbox[cpu])) + smp_call_function_interrupt(); + set_irq_regs(old_regs); +} + +static void +do_flush_tlb_all(void* info) +{ + unsigned long cpu = smp_processor_id(); + + __flush_tlb_all(); + if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_LAZY) + leave_mm(cpu); +} + + +/* flush the TLB of every active CPU in the system */ +void +flush_tlb_all(void) +{ + on_each_cpu(do_flush_tlb_all, 0, 1, 1); +} + +/* used to set up the trampoline for other CPUs when the memory manager + * is sorted out */ +void __init +smp_alloc_memory(void) +{ + trampoline_base = (__u32)alloc_bootmem_low_pages(PAGE_SIZE); + if(__pa(trampoline_base) >= 0x93000) + BUG(); +} + +/* send a reschedule CPI to one CPU by physical CPU number*/ +static void +voyager_smp_send_reschedule(int cpu) +{ + send_one_CPI(cpu, VIC_RESCHEDULE_CPI); +} + + +int +hard_smp_processor_id(void) +{ + __u8 i; + __u8 cpumask = inb(VIC_PROC_WHO_AM_I); + if((cpumask & QUAD_IDENTIFIER) == QUAD_IDENTIFIER) + return cpumask & 0x1F; + + for(i = 0; i < 8; i++) { + if(cpumask & (1<<i)) + return i; + } + printk("** WARNING ** Illegal cpuid returned by VIC: %d", cpumask); + return 0; +} + +int +safe_smp_processor_id(void) +{ + return hard_smp_processor_id(); +} + +/* broadcast a halt to all other CPUs */ +static void +voyager_smp_send_stop(void) +{ + smp_call_function(smp_stop_cpu_function, NULL, 1, 1); +} + +/* this function is triggered in time.c when a clock tick fires + * we need to re-broadcast the tick to all CPUs */ +void +smp_vic_timer_interrupt(void) +{ + send_CPI_allbutself(VIC_TIMER_CPI); + smp_local_timer_interrupt(); +} + +/* local (per CPU) timer interrupt. It does both profiling and + * process statistics/rescheduling. + * + * We do profiling in every local tick, statistics/rescheduling + * happen only every 'profiling multiplier' ticks. The default + * multiplier is 1 and it can be changed by writing the new multiplier + * value into /proc/profile. + */ +void +smp_local_timer_interrupt(void) +{ + int cpu = smp_processor_id(); + long weight; + + profile_tick(CPU_PROFILING); + if (--per_cpu(prof_counter, cpu) <= 0) { + /* + * The multiplier may have changed since the last time we got + * to this point as a result of the user writing to + * /proc/profile. In this case we need to adjust the APIC + * timer accordingly. + * + * Interrupts are already masked off at this point. + */ + per_cpu(prof_counter,cpu) = per_cpu(prof_multiplier, cpu); + if (per_cpu(prof_counter, cpu) != + per_cpu(prof_old_multiplier, cpu)) { + /* FIXME: need to update the vic timer tick here */ + per_cpu(prof_old_multiplier, cpu) = + per_cpu(prof_counter, cpu); + } + + update_process_times(user_mode_vm(get_irq_regs())); + } + + if( ((1<<cpu) & voyager_extended_vic_processors) == 0) + /* only extended VIC processors participate in + * interrupt distribution */ + return; + + /* + * We take the 'long' return path, and there every subsystem + * grabs the apropriate locks (kernel lock/ irq lock). + * + * we might want to decouple profiling from the 'long path', + * and do the profiling totally in assembly. + * + * Currently this isn't too much of an issue (performance wise), + * we can take more than 100K local irqs per second on a 100 MHz P5. + */ + + if((++vic_tick[cpu] & 0x7) != 0) + return; + /* get here every 16 ticks (about every 1/6 of a second) */ + + /* Change our priority to give someone else a chance at getting + * the IRQ. The algorithm goes like this: + * + * In the VIC, the dynamically routed interrupt is always + * handled by the lowest priority eligible (i.e. receiving + * interrupts) CPU. If >1 eligible CPUs are equal lowest, the + * lowest processor number gets it. + * + * The priority of a CPU is controlled by a special per-CPU + * VIC priority register which is 3 bits wide 0 being lowest + * and 7 highest priority.. + * + * Therefore we subtract the average number of interrupts from + * the number we've fielded. If this number is negative, we + * lower the activity count and if it is positive, we raise + * it. + * + * I'm afraid this still leads to odd looking interrupt counts: + * the totals are all roughly equal, but the individual ones + * look rather skewed. + * + * FIXME: This algorithm is total crap when mixed with SMP + * affinity code since we now try to even up the interrupt + * counts when an affinity binding is keeping them on a + * particular CPU*/ + weight = (vic_intr_count[cpu]*voyager_extended_cpus + - vic_intr_total) >> 4; + weight += 4; + if(weight > 7) + weight = 7; + if(weight < 0) + weight = 0; + + outb((__u8)weight, VIC_PRIORITY_REGISTER); + +#ifdef VOYAGER_DEBUG + if((vic_tick[cpu] & 0xFFF) == 0) { + /* print this message roughly every 25 secs */ + printk("VOYAGER SMP: vic_tick[%d] = %lu, weight = %ld\n", + cpu, vic_tick[cpu], weight); + } +#endif +} + +/* setup the profiling timer */ +int +setup_profiling_timer(unsigned int multiplier) +{ + int i; + + if ( (!multiplier)) + return -EINVAL; + + /* + * Set the new multiplier for each CPU. CPUs don't start using the + * new values until the next timer interrupt in which they do process + * accounting. + */ + for (i = 0; i < NR_CPUS; ++i) + per_cpu(prof_multiplier, i) = multiplier; + + return 0; +} + +/* This is a bit of a mess, but forced on us by the genirq changes + * there's no genirq handler that really does what voyager wants + * so hack it up with the simple IRQ handler */ +static void fastcall +handle_vic_irq(unsigned int irq, struct irq_desc *desc) +{ + before_handle_vic_irq(irq); + handle_simple_irq(irq, desc); + after_handle_vic_irq(irq); +} + + +/* The CPIs are handled in the per cpu 8259s, so they must be + * enabled to be received: FIX: enabling the CPIs in the early + * boot sequence interferes with bug checking; enable them later + * on in smp_init */ +#define VIC_SET_GATE(cpi, vector) \ + set_intr_gate((cpi) + VIC_DEFAULT_CPI_BASE, (vector)) +#define QIC_SET_GATE(cpi, vector) \ + set_intr_gate((cpi) + QIC_DEFAULT_CPI_BASE, (vector)) + +void __init +smp_intr_init(void) +{ + int i; + + /* initialize the per cpu irq mask to all disabled */ + for(i = 0; i < NR_CPUS; i++) + vic_irq_mask[i] = 0xFFFF; + + VIC_SET_GATE(VIC_CPI_LEVEL0, vic_cpi_interrupt); + + VIC_SET_GATE(VIC_SYS_INT, vic_sys_interrupt); + VIC_SET_GATE(VIC_CMN_INT, vic_cmn_interrupt); + + QIC_SET_GATE(QIC_TIMER_CPI, qic_timer_interrupt); + QIC_SET_GATE(QIC_INVALIDATE_CPI, qic_invalidate_interrupt); + QIC_SET_GATE(QIC_RESCHEDULE_CPI, qic_reschedule_interrupt); + QIC_SET_GATE(QIC_ENABLE_IRQ_CPI, qic_enable_irq_interrupt); + QIC_SET_GATE(QIC_CALL_FUNCTION_CPI, qic_call_function_interrupt); + + + /* now put the VIC descriptor into the first 48 IRQs + * + * This is for later: first 16 correspond to PC IRQs; next 16 + * are Primary MC IRQs and final 16 are Secondary MC IRQs */ + for(i = 0; i < 48; i++) + set_irq_chip_and_handler(i, &vic_chip, handle_vic_irq); +} + +/* send a CPI at level cpi to a set of cpus in cpuset (set 1 bit per + * processor to receive CPI */ +static void +send_CPI(__u32 cpuset, __u8 cpi) +{ + int cpu; + __u32 quad_cpuset = (cpuset & voyager_quad_processors); + + if(cpi < VIC_START_FAKE_CPI) { + /* fake CPI are only used for booting, so send to the + * extended quads as well---Quads must be VIC booted */ + outb((__u8)(cpuset), VIC_CPI_Registers[cpi]); + return; + } + if(quad_cpuset) + send_QIC_CPI(quad_cpuset, cpi); + cpuset &= ~quad_cpuset; + cpuset &= 0xff; /* only first 8 CPUs vaild for VIC CPI */ + if(cpuset == 0) + return; + for_each_online_cpu(cpu) { + if(cpuset & (1<<cpu)) + set_bit(cpi, &vic_cpi_mailbox[cpu]); + } + if(cpuset) + outb((__u8)cpuset, VIC_CPI_Registers[VIC_CPI_LEVEL0]); +} + +/* Acknowledge receipt of CPI in the QIC, clear in QIC hardware and + * set the cache line to shared by reading it. + * + * DON'T make this inline otherwise the cache line read will be + * optimised away + * */ +static int +ack_QIC_CPI(__u8 cpi) { + __u8 cpu = hard_smp_processor_id(); + + cpi &= 7; + + outb(1<<cpi, QIC_INTERRUPT_CLEAR1); + return voyager_quad_cpi_addr[cpu]->qic_cpi[cpi].cpi; +} + +static void +ack_special_QIC_CPI(__u8 cpi) +{ + switch(cpi) { + case VIC_CMN_INT: + outb(QIC_CMN_INT, QIC_INTERRUPT_CLEAR0); + break; + case VIC_SYS_INT: + outb(QIC_SYS_INT, QIC_INTERRUPT_CLEAR0); + break; + } + /* also clear at the VIC, just in case (nop for non-extended proc) */ + ack_VIC_CPI(cpi); +} + +/* Acknowledge receipt of CPI in the VIC (essentially an EOI) */ +static void +ack_VIC_CPI(__u8 cpi) +{ +#ifdef VOYAGER_DEBUG + unsigned long flags; + __u16 isr; + __u8 cpu = smp_processor_id(); + + local_irq_save(flags); + isr = vic_read_isr(); + if((isr & (1<<(cpi &7))) == 0) { + printk("VOYAGER SMP: CPU%d lost CPI%d\n", cpu, cpi); + } +#endif + /* send specific EOI; the two system interrupts have + * bit 4 set for a separate vector but behave as the + * corresponding 3 bit intr */ + outb_p(0x60|(cpi & 7),0x20); + +#ifdef VOYAGER_DEBUG + if((vic_read_isr() & (1<<(cpi &7))) != 0) { + printk("VOYAGER SMP: CPU%d still asserting CPI%d\n", cpu, cpi); + } + local_irq_restore(flags); +#endif +} + +/* cribbed with thanks from irq.c */ +#define __byte(x,y) (((unsigned char *)&(y))[x]) +#define cached_21(cpu) (__byte(0,vic_irq_mask[cpu])) +#define cached_A1(cpu) (__byte(1,vic_irq_mask[cpu])) + +static unsigned int +startup_vic_irq(unsigned int irq) +{ + unmask_vic_irq(irq); + + return 0; +} + +/* The enable and disable routines. This is where we run into + * conflicting architectural philosophy. Fundamentally, the voyager + * architecture does not expect to have to disable interrupts globally + * (the IRQ controllers belong to each CPU). The processor masquerade + * which is used to start the system shouldn't be used in a running OS + * since it will cause great confusion if two separate CPUs drive to + * the same IRQ controller (I know, I've tried it). + * + * The solution is a variant on the NCR lazy SPL design: + * + * 1) To disable an interrupt, do nothing (other than set the + * IRQ_DISABLED flag). This dares the interrupt actually to arrive. + * + * 2) If the interrupt dares to come in, raise the local mask against + * it (this will result in all the CPU masks being raised + * eventually). + * + * 3) To enable the interrupt, lower the mask on the local CPU and + * broadcast an Interrupt enable CPI which causes all other CPUs to + * adjust their masks accordingly. */ + +static void +unmask_vic_irq(unsigned int irq) +{ + /* linux doesn't to processor-irq affinity, so enable on + * all CPUs we know about */ + int cpu = smp_processor_id(), real_cpu; + __u16 mask = (1<<irq); + __u32 processorList = 0; + unsigned long flags; + + VDEBUG(("VOYAGER: unmask_vic_irq(%d) CPU%d affinity 0x%lx\n", + irq, cpu, cpu_irq_affinity[cpu])); + spin_lock_irqsave(&vic_irq_lock, flags); + for_each_online_cpu(real_cpu) { + if(!(voyager_extended_vic_processors & (1<<real_cpu))) + continue; + if(!(cpu_irq_affinity[real_cpu] & mask)) { + /* irq has no affinity for this CPU, ignore */ + continue; + } + if(real_cpu == cpu) { + enable_local_vic_irq(irq); + } + else if(vic_irq_mask[real_cpu] & mask) { + vic_irq_enable_mask[real_cpu] |= mask; + processorList |= (1<<real_cpu); + } + } + spin_unlock_irqrestore(&vic_irq_lock, flags); + if(processorList) + send_CPI(processorList, VIC_ENABLE_IRQ_CPI); +} + +static void +mask_vic_irq(unsigned int irq) +{ + /* lazy disable, do nothing */ +} + +static void +enable_local_vic_irq(unsigned int irq) +{ + __u8 cpu = smp_processor_id(); + __u16 mask = ~(1 << irq); + __u16 old_mask = vic_irq_mask[cpu]; + + vic_irq_mask[cpu] &= mask; + if(vic_irq_mask[cpu] == old_mask) + return; + + VDEBUG(("VOYAGER DEBUG: Enabling irq %d in hardware on CPU %d\n", + irq, cpu)); + + if (irq & 8) { + outb_p(cached_A1(cpu),0xA1); + (void)inb_p(0xA1); + } + else { + outb_p(cached_21(cpu),0x21); + (void)inb_p(0x21); + } +} + +static void +disable_local_vic_irq(unsigned int irq) +{ + __u8 cpu = smp_processor_id(); + __u16 mask = (1 << irq); + __u16 old_mask = vic_irq_mask[cpu]; + + if(irq == 7) + return; + + vic_irq_mask[cpu] |= mask; + if(old_mask == vic_irq_mask[cpu]) + return; + + VDEBUG(("VOYAGER DEBUG: Disabling irq %d in hardware on CPU %d\n", + irq, cpu)); + + if (irq & 8) { + outb_p(cached_A1(cpu),0xA1); + (void)inb_p(0xA1); + } + else { + outb_p(cached_21(cpu),0x21); + (void)inb_p(0x21); + } +} + +/* The VIC is level triggered, so the ack can only be issued after the + * interrupt completes. However, we do Voyager lazy interrupt + * handling here: It is an extremely expensive operation to mask an + * interrupt in the vic, so we merely set a flag (IRQ_DISABLED). If + * this interrupt actually comes in, then we mask and ack here to push + * the interrupt off to another CPU */ +static void +before_handle_vic_irq(unsigned int irq) +{ + irq_desc_t *desc = irq_desc + irq; + __u8 cpu = smp_processor_id(); + + _raw_spin_lock(&vic_irq_lock); + vic_intr_total++; + vic_intr_count[cpu]++; + + if(!(cpu_irq_affinity[cpu] & (1<<irq))) { + /* The irq is not in our affinity mask, push it off + * onto another CPU */ + VDEBUG(("VOYAGER DEBUG: affinity triggered disable of irq %d on cpu %d\n", + irq, cpu)); + disable_local_vic_irq(irq); + /* set IRQ_INPROGRESS to prevent the handler in irq.c from + * actually calling the interrupt routine */ + desc->status |= IRQ_REPLAY | IRQ_INPROGRESS; + } else if(desc->status & IRQ_DISABLED) { + /* Damn, the interrupt actually arrived, do the lazy + * disable thing. The interrupt routine in irq.c will + * not handle a IRQ_DISABLED interrupt, so nothing more + * need be done here */ + VDEBUG(("VOYAGER DEBUG: lazy disable of irq %d on CPU %d\n", + irq, cpu)); + disable_local_vic_irq(irq); + desc->status |= IRQ_REPLAY; + } else { + desc->status &= ~IRQ_REPLAY; + } + + _raw_spin_unlock(&vic_irq_lock); +} + +/* Finish the VIC interrupt: basically mask */ +static void +after_handle_vic_irq(unsigned int irq) +{ + irq_desc_t *desc = irq_desc + irq; + + _raw_spin_lock(&vic_irq_lock); + { + unsigned int status = desc->status & ~IRQ_INPROGRESS; +#ifdef VOYAGER_DEBUG + __u16 isr; +#endif + + desc->status = status; + if ((status & IRQ_DISABLED)) + disable_local_vic_irq(irq); +#ifdef VOYAGER_DEBUG + /* DEBUG: before we ack, check what's in progress */ + isr = vic_read_isr(); + if((isr & (1<<irq) && !(status & IRQ_REPLAY)) == 0) { + int i; + __u8 cpu = smp_processor_id(); + __u8 real_cpu; + int mask; /* Um... initialize me??? --RR */ + + printk("VOYAGER SMP: CPU%d lost interrupt %d\n", + cpu, irq); + for_each_possible_cpu(real_cpu, mask) { + + outb(VIC_CPU_MASQUERADE_ENABLE | real_cpu, + VIC_PROCESSOR_ID); + isr = vic_read_isr(); + if(isr & (1<<irq)) { + printk("VOYAGER SMP: CPU%d ack irq %d\n", + real_cpu, irq); + ack_vic_irq(irq); + } + outb(cpu, VIC_PROCESSOR_ID); + } + } +#endif /* VOYAGER_DEBUG */ + /* as soon as we ack, the interrupt is eligible for + * receipt by another CPU so everything must be in + * order here */ + ack_vic_irq(irq); + if(status & IRQ_REPLAY) { + /* replay is set if we disable the interrupt + * in the before_handle_vic_irq() routine, so + * clear the in progress bit here to allow the + * next CPU to handle this correctly */ + desc->status &= ~(IRQ_REPLAY | IRQ_INPROGRESS); + } +#ifdef VOYAGER_DEBUG + isr = vic_read_isr(); + if((isr & (1<<irq)) != 0) + printk("VOYAGER SMP: after_handle_vic_irq() after ack irq=%d, isr=0x%x\n", + irq, isr); +#endif /* VOYAGER_DEBUG */ + } + _raw_spin_unlock(&vic_irq_lock); + + /* All code after this point is out of the main path - the IRQ + * may be intercepted by another CPU if reasserted */ +} + + +/* Linux processor - interrupt affinity manipulations. + * + * For each processor, we maintain a 32 bit irq affinity mask. + * Initially it is set to all 1's so every processor accepts every + * interrupt. In this call, we change the processor's affinity mask: + * + * Change from enable to disable: + * + * If the interrupt ever comes in to the processor, we will disable it + * and ack it to push it off to another CPU, so just accept the mask here. + * + * Change from disable to enable: + * + * change the mask and then do an interrupt enable CPI to re-enable on + * the selected processors */ + +void +set_vic_irq_affinity(unsigned int irq, cpumask_t mask) +{ + /* Only extended processors handle interrupts */ + unsigned long real_mask; + unsigned long irq_mask = 1 << irq; + int cpu; + + real_mask = cpus_addr(mask)[0] & voyager_extended_vic_processors; + + if(cpus_addr(mask)[0] == 0) + /* can't have no cpu's to accept the interrupt -- extremely + * bad things will happen */ + return; + + if(irq == 0) + /* can't change the affinity of the timer IRQ. This + * is due to the constraint in the voyager + * architecture that the CPI also comes in on and IRQ + * line and we have chosen IRQ0 for this. If you + * raise the mask on this interrupt, the processor + * will no-longer be able to accept VIC CPIs */ + return; + + if(irq >= 32) + /* You can only have 32 interrupts in a voyager system + * (and 32 only if you have a secondary microchannel + * bus) */ + return; + + for_each_online_cpu(cpu) { + unsigned long cpu_mask = 1 << cpu; + + if(cpu_mask & real_mask) { + /* enable the interrupt for this cpu */ + cpu_irq_affinity[cpu] |= irq_mask; + } else { + /* disable the interrupt for this cpu */ + cpu_irq_affinity[cpu] &= ~irq_mask; + } + } + /* this is magic, we now have the correct affinity maps, so + * enable the interrupt. This will send an enable CPI to + * those cpu's who need to enable it in their local masks, + * causing them to correct for the new affinity . If the + * interrupt is currently globally disabled, it will simply be + * disabled again as it comes in (voyager lazy disable). If + * the affinity map is tightened to disable the interrupt on a + * cpu, it will be pushed off when it comes in */ + unmask_vic_irq(irq); +} + +static void +ack_vic_irq(unsigned int irq) +{ + if (irq & 8) { + outb(0x62,0x20); /* Specific EOI to cascade */ + outb(0x60|(irq & 7),0xA0); + } else { + outb(0x60 | (irq & 7),0x20); + } +} + +/* enable the CPIs. In the VIC, the CPIs are delivered by the 8259 + * but are not vectored by it. This means that the 8259 mask must be + * lowered to receive them */ +static __init void +vic_enable_cpi(void) +{ + __u8 cpu = smp_processor_id(); + + /* just take a copy of the current mask (nop for boot cpu) */ + vic_irq_mask[cpu] = vic_irq_mask[boot_cpu_id]; + + enable_local_vic_irq(VIC_CPI_LEVEL0); + enable_local_vic_irq(VIC_CPI_LEVEL1); + /* for sys int and cmn int */ + enable_local_vic_irq(7); + + if(is_cpu_quad()) { + outb(QIC_DEFAULT_MASK0, QIC_MASK_REGISTER0); + outb(QIC_CPI_ENABLE, QIC_MASK_REGISTER1); + VDEBUG(("VOYAGER SMP: QIC ENABLE CPI: CPU%d: MASK 0x%x\n", + cpu, QIC_CPI_ENABLE)); + } + + VDEBUG(("VOYAGER SMP: ENABLE CPI: CPU%d: MASK 0x%x\n", + cpu, vic_irq_mask[cpu])); +} + +void +voyager_smp_dump() +{ + int old_cpu = smp_processor_id(), cpu; + + /* dump the interrupt masks of each processor */ + for_each_online_cpu(cpu) { + __u16 imr, isr, irr; + unsigned long flags; + + local_irq_save(flags); + outb(VIC_CPU_MASQUERADE_ENABLE | cpu, VIC_PROCESSOR_ID); + imr = (inb(0xa1) << 8) | inb(0x21); + outb(0x0a, 0xa0); + irr = inb(0xa0) << 8; + outb(0x0a, 0x20); + irr |= inb(0x20); + outb(0x0b, 0xa0); + isr = inb(0xa0) << 8; + outb(0x0b, 0x20); + isr |= inb(0x20); + outb(old_cpu, VIC_PROCESSOR_ID); + local_irq_restore(flags); + printk("\tCPU%d: mask=0x%x, IMR=0x%x, IRR=0x%x, ISR=0x%x\n", + cpu, vic_irq_mask[cpu], imr, irr, isr); +#if 0 + /* These lines are put in to try to unstick an un ack'd irq */ + if(isr != 0) { + int irq; + for(irq=0; irq<16; irq++) { + if(isr & (1<<irq)) { + printk("\tCPU%d: ack irq %d\n", + cpu, irq); + local_irq_save(flags); + outb(VIC_CPU_MASQUERADE_ENABLE | cpu, + VIC_PROCESSOR_ID); + ack_vic_irq(irq); + outb(old_cpu, VIC_PROCESSOR_ID); + local_irq_restore(flags); + } + } + } +#endif + } +} + +void +smp_voyager_power_off(void *dummy) +{ + if(smp_processor_id() == boot_cpu_id) + voyager_power_off(); + else + smp_stop_cpu_function(NULL); +} + +static void __init +voyager_smp_prepare_cpus(unsigned int max_cpus) +{ + /* FIXME: ignore max_cpus for now */ + smp_boot_cpus(); +} + +static void __devinit voyager_smp_prepare_boot_cpu(void) +{ + init_gdt(smp_processor_id()); + switch_to_new_gdt(); + + cpu_set(smp_processor_id(), cpu_online_map); + cpu_set(smp_processor_id(), cpu_callout_map); + cpu_set(smp_processor_id(), cpu_possible_map); + cpu_set(smp_processor_id(), cpu_present_map); +} + +static int __devinit +voyager_cpu_up(unsigned int cpu) +{ + /* This only works at boot for x86. See "rewrite" above. */ + if (cpu_isset(cpu, smp_commenced_mask)) + return -ENOSYS; + + /* In case one didn't come up */ + if (!cpu_isset(cpu, cpu_callin_map)) + return -EIO; + /* Unleash the CPU! */ + cpu_set(cpu, smp_commenced_mask); + while (!cpu_isset(cpu, cpu_online_map)) + mb(); + return 0; +} + +static void __init +voyager_smp_cpus_done(unsigned int max_cpus) +{ + zap_low_mappings(); +} + +void __init +smp_setup_processor_id(void) +{ + current_thread_info()->cpu = hard_smp_processor_id(); + x86_write_percpu(cpu_number, hard_smp_processor_id()); +} + +struct smp_ops smp_ops = { + .smp_prepare_boot_cpu = voyager_smp_prepare_boot_cpu, + .smp_prepare_cpus = voyager_smp_prepare_cpus, + .cpu_up = voyager_cpu_up, + .smp_cpus_done = voyager_smp_cpus_done, + + .smp_send_stop = voyager_smp_send_stop, + .smp_send_reschedule = voyager_smp_send_reschedule, + .smp_call_function_mask = voyager_smp_call_function_mask, +}; |