diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 18 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/kernel/paca.c | 93 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup-common.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 12 | ||||
| -rw-r--r-- | arch/powerpc/platforms/iseries/exception.S | 25 |
7 files changed, 118 insertions, 42 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index d8a693109c8..a011603d407 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -14,6 +14,9 @@ #define _ASM_POWERPC_PACA_H #ifdef __KERNEL__ +#ifdef CONFIG_PPC64 + +#include <linux/init.h> #include <asm/types.h> #include <asm/lppaca.h> #include <asm/mmu.h> @@ -145,8 +148,19 @@ struct paca_struct { #endif }; -extern struct paca_struct paca[]; -extern void initialise_pacas(void); +extern struct paca_struct *paca; +extern __initdata struct paca_struct boot_paca; +extern void initialise_paca(struct paca_struct *new_paca, int cpu); + +extern void allocate_pacas(void); +extern void free_unused_pacas(void); + +#else /* CONFIG_PPC64 */ + +static inline void allocate_pacas(void) { }; +static inline void free_unused_pacas(void) { }; + +#endif /* CONFIG_PPC64 */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_PACA_H */ diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 92580748802..b24b7001ae1 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -219,7 +219,8 @@ generic_secondary_common_init: * physical cpu id in r24, we need to search the pacas to find * which logical id maps to our physical one. */ - LOAD_REG_ADDR(r13, paca) /* Get base vaddr of paca array */ + LOAD_REG_ADDR(r13, paca) /* Load paca pointer */ + ld r13,0(r13) /* Get base vaddr of paca array */ li r5,0 /* logical cpu id */ 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ cmpw r6,r24 /* Compare to our id */ @@ -536,7 +537,8 @@ _GLOBAL(pmac_secondary_start) mtmsrd r3 /* RI on */ /* Set up a paca value for this processor. */ - LOAD_REG_ADDR(r4,paca) /* Get base vaddr of paca array */ + LOAD_REG_ADDR(r4,paca) /* Load paca pointer */ + ld r4,0(r4) /* Get base vaddr of paca array */ mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ add r13,r13,r4 /* for this processor. */ mtspr SPRN_SPRG_PACA,r13 /* Save vaddr of paca in an SPRG*/ diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index d16b1ea55d4..0c40c6f476f 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -9,11 +9,15 @@ #include <linux/threads.h> #include <linux/module.h> +#include <linux/lmb.h> +#include <asm/firmware.h> #include <asm/lppaca.h> #include <asm/paca.h> #include <asm/sections.h> #include <asm/pgtable.h> +#include <asm/iseries/lpar_map.h> +#include <asm/iseries/hv_types.h> /* This symbol is provided by the linker - let it fill in the paca * field correctly */ @@ -70,37 +74,82 @@ struct slb_shadow slb_shadow[] __cacheline_aligned = { * processors. The processor VPD array needs one entry per physical * processor (not thread). */ -struct paca_struct paca[NR_CPUS]; +struct paca_struct *paca; EXPORT_SYMBOL(paca); -void __init initialise_pacas(void) -{ - int cpu; +struct paca_struct boot_paca; - /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB - * of the TOC can be addressed using a single machine instruction. - */ +void __init initialise_paca(struct paca_struct *new_paca, int cpu) +{ + /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB + * of the TOC can be addressed using a single machine instruction. + */ unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; - /* Can't use for_each_*_cpu, as they aren't functional yet */ - for (cpu = 0; cpu < NR_CPUS; cpu++) { - struct paca_struct *new_paca = &paca[cpu]; - #ifdef CONFIG_PPC_BOOK3S - new_paca->lppaca_ptr = &lppaca[cpu]; + new_paca->lppaca_ptr = &lppaca[cpu]; #else - new_paca->kernel_pgd = swapper_pg_dir; + new_paca->kernel_pgd = swapper_pg_dir; #endif - new_paca->lock_token = 0x8000; - new_paca->paca_index = cpu; - new_paca->kernel_toc = kernel_toc; - new_paca->kernelbase = (unsigned long) _stext; - new_paca->kernel_msr = MSR_KERNEL; - new_paca->hw_cpu_id = 0xffff; - new_paca->__current = &init_task; + new_paca->lock_token = 0x8000; + new_paca->paca_index = cpu; + new_paca->kernel_toc = kernel_toc; + new_paca->kernelbase = (unsigned long) _stext; + new_paca->kernel_msr = MSR_KERNEL; + new_paca->hw_cpu_id = 0xffff; + new_paca->__current = &init_task; #ifdef CONFIG_PPC_STD_MMU_64 - new_paca->slb_shadow_ptr = &slb_shadow[cpu]; + new_paca->slb_shadow_ptr = &slb_shadow[cpu]; #endif /* CONFIG_PPC_STD_MMU_64 */ +} + +static int __initdata paca_size; + +void __init allocate_pacas(void) +{ + int nr_cpus, cpu, limit; + + /* + * We can't take SLB misses on the paca, and we want to access them + * in real mode, so allocate them within the RMA and also within + * the first segment. On iSeries they must be within the area mapped + * by the HV, which is HvPagesToMap * HVPAGESIZE bytes. + */ + limit = min(0x10000000ULL, lmb.rmo_size); + if (firmware_has_feature(FW_FEATURE_ISERIES)) + limit = min(limit, HvPagesToMap * HVPAGESIZE); + + nr_cpus = NR_CPUS; + /* On iSeries we know we can never have more than 64 cpus */ + if (firmware_has_feature(FW_FEATURE_ISERIES)) + nr_cpus = min(64, nr_cpus); + + paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus); + + paca = __va(lmb_alloc_base(paca_size, PAGE_SIZE, limit)); + memset(paca, 0, paca_size); + + printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", + paca_size, nr_cpus, paca); + + /* Can't use for_each_*_cpu, as they aren't functional yet */ + for (cpu = 0; cpu < nr_cpus; cpu++) + initialise_paca(&paca[cpu], cpu); +} + +void __init free_unused_pacas(void) +{ + int new_size; + + new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus()); + + if (new_size >= paca_size) + return; + + lmb_free(__pa(paca) + new_size, paca_size - new_size); + + printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", + paca_size - new_size); - } + paca_size = new_size; } diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 43238b2054b..05131d634e7 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -43,6 +43,7 @@ #include <asm/smp.h> #include <asm/system.h> #include <asm/mmu.h> +#include <asm/paca.h> #include <asm/pgtable.h> #include <asm/pci.h> #include <asm/iommu.h> @@ -721,6 +722,8 @@ void __init early_init_devtree(void *params) * FIXME .. and the initrd too? */ move_device_tree(); + allocate_pacas(); + DBG("Scanning CPUs ...\n"); /* Retreive CPU related informations from the flat tree diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index 03dd6a24819..48f0a008b20 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -36,6 +36,7 @@ #include <linux/lmb.h> #include <linux/of_platform.h> #include <asm/io.h> +#include <asm/paca.h> #include <asm/prom.h> #include <asm/processor.h> #include <asm/vdso_datapage.h> @@ -493,6 +494,8 @@ void __init smp_setup_cpu_maps(void) * here will have to be reworked */ cpu_init_thread_core_maps(nthreads); + + free_unused_pacas(); } #endif /* CONFIG_SMP */ diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 6568406b2a3..63547394048 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -144,9 +144,9 @@ early_param("smt-enabled", early_smt_enabled); #endif /* CONFIG_SMP */ /* Put the paca pointer into r13 and SPRG_PACA */ -void __init setup_paca(int cpu) +static void __init setup_paca(struct paca_struct *new_paca) { - local_paca = &paca[cpu]; + local_paca = new_paca; mtspr(SPRN_SPRG_PACA, local_paca); #ifdef CONFIG_PPC_BOOK3E mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); @@ -176,14 +176,12 @@ void __init early_setup(unsigned long dt_ptr) { /* -------- printk is _NOT_ safe to use here ! ------- */ - /* Fill in any unititialised pacas */ - initialise_pacas(); - /* Identify CPU type */ identify_cpu(0, mfspr(SPRN_PVR)); /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ - setup_paca(0); + initialise_paca(&boot_paca, 0); + setup_paca(&boot_paca); /* Initialize lockdep early or else spinlocks will blow */ lockdep_init(); @@ -203,7 +201,7 @@ void __init early_setup(unsigned long dt_ptr) early_init_devtree(__va(dt_ptr)); /* Now we know the logical id of our boot cpu, setup the paca. */ - setup_paca(boot_cpuid); + setup_paca(&paca[boot_cpuid]); /* Fix up paca fields required for the boot cpu */ get_paca()->cpu_start = 1; diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S index 5369653dcf6..fba5bf91507 100644 --- a/arch/powerpc/platforms/iseries/exception.S +++ b/arch/powerpc/platforms/iseries/exception.S @@ -43,17 +43,14 @@ system_reset_iSeries: LOAD_REG_ADDR(r23, alpaca) li r0,ALPACA_SIZE sub r23,r13,r23 - divdu r23,r23,r0 /* r23 has cpu number */ - LOAD_REG_ADDR(r13, paca) - mulli r0,r23,PACA_SIZE - add r13,r13,r0 - mtspr SPRN_SPRG_PACA,r13 /* Save it away for the future */ - mfmsr r24 - ori r24,r24,MSR_RI - mtmsrd r24 /* RI on */ - mr r24,r23 + divdu r24,r23,r0 /* r24 has cpu number */ cmpwi 0,r24,0 /* Are we processor 0? */ bne 1f + LOAD_REG_ADDR(r13, boot_paca) + mtspr SPRN_SPRG_PACA,r13 /* Save it away for the future */ + mfmsr r23 + ori r23,r23,MSR_RI + mtmsrd r23 /* RI on */ b .__start_initialization_iSeries /* Start up the first processor */ 1: mfspr r4,SPRN_CTRLF li r5,CTRL_RUNLATCH /* Turn off the run light */ @@ -86,6 +83,16 @@ system_reset_iSeries: #endif 2: + /* Load our paca now that it's been allocated */ + LOAD_REG_ADDR(r13, paca) + ld r13,0(r13) + mulli r0,r24,PACA_SIZE + add r13,r13,r0 + mtspr SPRN_SPRG_PACA,r13 /* Save it away for the future */ + mfmsr r23 + ori r23,r23,MSR_RI + mtmsrd r23 /* RI on */ + HMT_LOW #ifdef CONFIG_SMP lbz r23,PACAPROCSTART(r13) /* Test if this processor |