diff options
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
| -rw-r--r-- | arch/powerpc/kernel/paca.c | 242 |
1 files changed, 123 insertions, 119 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index 95ffedf14885..0ee3e6d50f28 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -20,116 +20,105 @@ #include "setup.h" -#ifdef CONFIG_PPC_BOOK3S +#ifndef CONFIG_SMP +#define boot_cpuid 0 +#endif + +static void *__init alloc_paca_data(unsigned long size, unsigned long align, + unsigned long limit, int cpu) +{ + unsigned long pa; + int nid; + + /* + * boot_cpuid paca is allocated very early before cpu_to_node is up. + * Set bottom-up mode, because the boot CPU should be on node-0, + * which will put its paca in the right place. + */ + if (cpu == boot_cpuid) { + nid = -1; + memblock_set_bottom_up(true); + } else { + nid = early_cpu_to_node(cpu); + } + + pa = memblock_alloc_base_nid(size, align, limit, nid, MEMBLOCK_NONE); + if (!pa) { + pa = memblock_alloc_base(size, align, limit); + if (!pa) + panic("cannot allocate paca data"); + } + + if (cpu == boot_cpuid) + memblock_set_bottom_up(false); + + return __va(pa); +} + +#ifdef CONFIG_PPC_PSERIES /* - * The structure which the hypervisor knows about - this structure - * should not cross a page boundary. The vpa_init/register_vpa call - * is now known to fail if the lppaca structure crosses a page - * boundary. The lppaca is also used on POWER5 pSeries boxes. - * The lppaca is 640 bytes long, and cannot readily - * change since the hypervisor knows its layout, so a 1kB alignment - * will suffice to ensure that it doesn't cross a page boundary. + * See asm/lppaca.h for more detail. + * + * lppaca structures must must be 1kB in size, L1 cache line aligned, + * and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy + * these requirements. */ -struct lppaca lppaca[] = { - [0 ... (NR_LPPACAS-1)] = { +static inline void init_lppaca(struct lppaca *lppaca) +{ + BUILD_BUG_ON(sizeof(struct lppaca) != 640); + + *lppaca = (struct lppaca) { .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ - .size = cpu_to_be16(sizeof(struct lppaca)), + .size = cpu_to_be16(0x400), .fpregs_in_use = 1, .slb_count = cpu_to_be16(64), .vmxregs_in_use = 0, - .page_ins = 0, - }, + .page_ins = 0, }; }; -static struct lppaca *extra_lppacas; -static long __initdata lppaca_size; - -static void __init allocate_lppacas(int nr_cpus, unsigned long limit) -{ - if (nr_cpus <= NR_LPPACAS) - return; - - lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * - (nr_cpus - NR_LPPACAS)); - extra_lppacas = __va(memblock_alloc_base(lppaca_size, - PAGE_SIZE, limit)); -} - -static struct lppaca * __init new_lppaca(int cpu) +static struct lppaca * __init new_lppaca(int cpu, unsigned long limit) { struct lppaca *lp; + size_t size = 0x400; - if (cpu < NR_LPPACAS) - return &lppaca[cpu]; + BUILD_BUG_ON(size < sizeof(struct lppaca)); + + if (early_cpu_has_feature(CPU_FTR_HVMODE)) + return NULL; - lp = extra_lppacas + (cpu - NR_LPPACAS); - *lp = lppaca[0]; + lp = alloc_paca_data(size, 0x400, limit, cpu); + init_lppaca(lp); return lp; } - -static void __init free_lppacas(void) -{ - long new_size = 0, nr; - - if (!lppaca_size) - return; - nr = num_possible_cpus() - NR_LPPACAS; - if (nr > 0) - new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); - if (new_size >= lppaca_size) - return; - - memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); - lppaca_size = new_size; -} - -#else - -static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } -static inline void free_lppacas(void) { } - #endif /* CONFIG_PPC_BOOK3S */ #ifdef CONFIG_PPC_BOOK3S_64 /* - * 3 persistent SLBs are registered here. The buffer will be zero + * 3 persistent SLBs are allocated here. The buffer will be zero * initially, hence will all be invaild until we actually write them. * * If you make the number of persistent SLB entries dynamic, please also * update PR KVM to flush and restore them accordingly. */ -static struct slb_shadow * __initdata slb_shadow; - -static void __init allocate_slb_shadows(int nr_cpus, int limit) -{ - int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus); - - if (early_radix_enabled()) - return; - - slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit)); - memset(slb_shadow, 0, size); -} - -static struct slb_shadow * __init init_slb_shadow(int cpu) +static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit) { struct slb_shadow *s; - if (early_radix_enabled()) - return NULL; - - s = &slb_shadow[cpu]; + if (cpu != boot_cpuid) { + /* + * Boot CPU comes here before early_radix_enabled + * is parsed (e.g., for disable_radix). So allocate + * always and this will be fixed up in free_unused_pacas. + */ + if (early_radix_enabled()) + return NULL; + } - /* - * When we come through here to initialise boot_paca, the slb_shadow - * buffers are not allocated yet. That's OK, we'll get one later in - * boot, but make sure we don't corrupt memory at 0. - */ - if (!slb_shadow) - return NULL; + s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu); + memset(s, 0, sizeof(*s)); s->persistent = cpu_to_be32(SLB_NUM_BOLTED); s->buffer_length = cpu_to_be32(sizeof(*s)); @@ -137,10 +126,6 @@ static struct slb_shadow * __init init_slb_shadow(int cpu) return s; } -#else /* !CONFIG_PPC_BOOK3S_64 */ - -static void __init allocate_slb_shadows(int nr_cpus, int limit) { } - #endif /* CONFIG_PPC_BOOK3S_64 */ /* The Paca is an array with one entry per processor. Each contains an @@ -152,14 +137,15 @@ static void __init allocate_slb_shadows(int nr_cpus, int limit) { } * processors. The processor VPD array needs one entry per physical * processor (not thread). */ -struct paca_struct *paca; -EXPORT_SYMBOL(paca); +struct paca_struct **paca_ptrs __read_mostly; +EXPORT_SYMBOL(paca_ptrs); void __init initialise_paca(struct paca_struct *new_paca, int cpu) { -#ifdef CONFIG_PPC_BOOK3S - new_paca->lppaca_ptr = new_lppaca(cpu); -#else +#ifdef CONFIG_PPC_PSERIES + new_paca->lppaca_ptr = NULL; +#endif +#ifdef CONFIG_PPC_BOOK3E new_paca->kernel_pgd = swapper_pg_dir; #endif new_paca->lock_token = 0x8000; @@ -173,7 +159,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu) new_paca->__current = &init_task; new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; #ifdef CONFIG_PPC_BOOK3S_64 - new_paca->slb_shadow_ptr = init_slb_shadow(cpu); + new_paca->slb_shadow_ptr = NULL; #endif #ifdef CONFIG_PPC_BOOK3E @@ -203,12 +189,25 @@ void setup_paca(struct paca_struct *new_paca) } -static int __initdata paca_size; +static int __initdata paca_nr_cpu_ids; +static int __initdata paca_ptrs_size; +static int __initdata paca_struct_size; + +void __init allocate_paca_ptrs(void) +{ + paca_nr_cpu_ids = nr_cpu_ids; + + paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; + paca_ptrs = __va(memblock_alloc(paca_ptrs_size, 0)); + memset(paca_ptrs, 0x88, paca_ptrs_size); +} -void __init allocate_pacas(void) +void __init allocate_paca(int cpu) { u64 limit; - int cpu; + struct paca_struct *paca; + + BUG_ON(cpu >= paca_nr_cpu_ids); #ifdef CONFIG_PPC_BOOK3S_64 /* @@ -220,40 +219,44 @@ void __init allocate_pacas(void) limit = ppc64_rma_size; #endif - paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); - - paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); - memset(paca, 0, paca_size); - - printk(KERN_DEBUG "Allocated %u bytes for %u pacas at %p\n", - paca_size, nr_cpu_ids, paca); - - allocate_lppacas(nr_cpu_ids, limit); - - allocate_slb_shadows(nr_cpu_ids, limit); + paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES, + limit, cpu); + paca_ptrs[cpu] = paca; + memset(paca, 0, sizeof(struct paca_struct)); - /* Can't use for_each_*_cpu, as they aren't functional yet */ - for (cpu = 0; cpu < nr_cpu_ids; cpu++) - initialise_paca(&paca[cpu], cpu); + initialise_paca(paca, cpu); +#ifdef CONFIG_PPC_PSERIES + paca->lppaca_ptr = new_lppaca(cpu, limit); +#endif +#ifdef CONFIG_PPC_BOOK3S_64 + paca->slb_shadow_ptr = new_slb_shadow(cpu, limit); +#endif + paca_struct_size += sizeof(struct paca_struct); } void __init free_unused_pacas(void) { - int new_size; - - new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); + int new_ptrs_size; - if (new_size >= paca_size) - return; + new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids; + if (new_ptrs_size < paca_ptrs_size) + memblock_free(__pa(paca_ptrs) + new_ptrs_size, + paca_ptrs_size - new_ptrs_size); - memblock_free(__pa(paca) + new_size, paca_size - new_size); + paca_nr_cpu_ids = nr_cpu_ids; + paca_ptrs_size = new_ptrs_size; - printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", - paca_size - new_size); - - paca_size = new_size; +#ifdef CONFIG_PPC_BOOK3S_64 + if (early_radix_enabled()) { + /* Ugly fixup, see new_slb_shadow() */ + memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr), + sizeof(struct slb_shadow)); + paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL; + } +#endif - free_lppacas(); + printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n", + paca_ptrs_size + paca_struct_size, nr_cpu_ids); } void copy_mm_to_paca(struct mm_struct *mm) @@ -265,7 +268,8 @@ void copy_mm_to_paca(struct mm_struct *mm) #ifdef CONFIG_PPC_MM_SLICES VM_BUG_ON(!mm->context.slb_addr_limit); get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit; - get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize; + memcpy(&get_paca()->mm_ctx_low_slices_psize, + &context->low_slices_psize, sizeof(context->low_slices_psize)); memcpy(&get_paca()->mm_ctx_high_slices_psize, &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); #else /* CONFIG_PPC_MM_SLICES */ |