diff options
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 119 |
1 files changed, 94 insertions, 25 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 71efb38d599b..a02266dad215 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -24,18 +24,17 @@ #include <asm/cputable.h> #include <asm/spu.h> +#define HPAGE_SHIFT_64K 16 +#define HPAGE_SHIFT_16M 24 + #define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT) #define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT) -#ifdef CONFIG_PPC_64K_PAGES -#define HUGEPTE_INDEX_SIZE (PMD_SHIFT-HPAGE_SHIFT) -#else -#define HUGEPTE_INDEX_SIZE (PUD_SHIFT-HPAGE_SHIFT) -#endif -#define PTRS_PER_HUGEPTE (1 << HUGEPTE_INDEX_SIZE) -#define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << HUGEPTE_INDEX_SIZE) +unsigned int hugepte_shift; +#define PTRS_PER_HUGEPTE (1 << hugepte_shift) +#define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << hugepte_shift) -#define HUGEPD_SHIFT (HPAGE_SHIFT + HUGEPTE_INDEX_SIZE) +#define HUGEPD_SHIFT (HPAGE_SHIFT + hugepte_shift) #define HUGEPD_SIZE (1UL << HUGEPD_SHIFT) #define HUGEPD_MASK (~(HUGEPD_SIZE-1)) @@ -82,11 +81,35 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, return 0; } +/* Base page size affects how we walk hugetlb page tables */ +#ifdef CONFIG_PPC_64K_PAGES +#define hpmd_offset(pud, addr) pmd_offset(pud, addr) +#define hpmd_alloc(mm, pud, addr) pmd_alloc(mm, pud, addr) +#else +static inline +pmd_t *hpmd_offset(pud_t *pud, unsigned long addr) +{ + if (HPAGE_SHIFT == HPAGE_SHIFT_64K) + return pmd_offset(pud, addr); + else + return (pmd_t *) pud; +} +static inline +pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr) +{ + if (HPAGE_SHIFT == HPAGE_SHIFT_64K) + return pmd_alloc(mm, pud, addr); + else + return (pmd_t *) pud; +} +#endif + /* Modelled after find_linux_pte() */ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) { pgd_t *pg; pud_t *pu; + pmd_t *pm; BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); @@ -96,14 +119,9 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) if (!pgd_none(*pg)) { pu = pud_offset(pg, addr); if (!pud_none(*pu)) { -#ifdef CONFIG_PPC_64K_PAGES - pmd_t *pm; - pm = pmd_offset(pu, addr); + pm = hpmd_offset(pu, addr); if (!pmd_none(*pm)) return hugepte_offset((hugepd_t *)pm, addr); -#else - return hugepte_offset((hugepd_t *)pu, addr); -#endif } } @@ -114,6 +132,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) { pgd_t *pg; pud_t *pu; + pmd_t *pm; hugepd_t *hpdp = NULL; BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize); @@ -124,14 +143,9 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) pu = pud_alloc(mm, pg, addr); if (pu) { -#ifdef CONFIG_PPC_64K_PAGES - pmd_t *pm; - pm = pmd_alloc(mm, pu, addr); + pm = hpmd_alloc(mm, pu, addr); if (pm) hpdp = (hugepd_t *)pm; -#else - hpdp = (hugepd_t *)pu; -#endif } if (! hpdp) @@ -158,7 +172,6 @@ static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp) PGF_CACHENUM_MASK)); } -#ifdef CONFIG_PPC_64K_PAGES static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, unsigned long addr, unsigned long end, unsigned long floor, unsigned long ceiling) @@ -191,7 +204,6 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, pud_clear(pud); pmd_free_tlb(tlb, pmd); } -#endif static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, unsigned long addr, unsigned long end, @@ -210,9 +222,15 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, continue; hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling); #else - if (pud_none(*pud)) - continue; - free_hugepte_range(tlb, (hugepd_t *)pud); + if (HPAGE_SHIFT == HPAGE_SHIFT_64K) { + if (pud_none_or_clear_bad(pud)) + continue; + hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling); + } else { + if (pud_none(*pud)) + continue; + free_hugepte_range(tlb, (hugepd_t *)pud); + } #endif } while (pud++, addr = next, addr != end); @@ -526,6 +544,57 @@ repeat: return err; } +void set_huge_psize(int psize) +{ + /* Check that it is a page size supported by the hardware and + * that it fits within pagetable limits. */ + if (mmu_psize_defs[psize].shift && mmu_psize_defs[psize].shift < SID_SHIFT && + (mmu_psize_defs[psize].shift > MIN_HUGEPTE_SHIFT || + mmu_psize_defs[psize].shift == HPAGE_SHIFT_64K)) { + HPAGE_SHIFT = mmu_psize_defs[psize].shift; + mmu_huge_psize = psize; +#ifdef CONFIG_PPC_64K_PAGES + hugepte_shift = (PMD_SHIFT-HPAGE_SHIFT); +#else + if (HPAGE_SHIFT == HPAGE_SHIFT_64K) + hugepte_shift = (PMD_SHIFT-HPAGE_SHIFT); + else + hugepte_shift = (PUD_SHIFT-HPAGE_SHIFT); +#endif + + } else + HPAGE_SHIFT = 0; +} + +static int __init hugepage_setup_sz(char *str) +{ + unsigned long long size; + int mmu_psize = -1; + int shift; + + size = memparse(str, &str); + + shift = __ffs(size); + switch (shift) { +#ifndef CONFIG_PPC_64K_PAGES + case HPAGE_SHIFT_64K: + mmu_psize = MMU_PAGE_64K; + break; +#endif + case HPAGE_SHIFT_16M: + mmu_psize = MMU_PAGE_16M; + break; + } + + if (mmu_psize >=0 && mmu_psize_defs[mmu_psize].shift) + set_huge_psize(mmu_psize); + else + printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size); + + return 1; +} +__setup("hugepagesz=", hugepage_setup_sz); + static void zero_ctor(struct kmem_cache *cache, void *addr) { memset(addr, 0, kmem_cache_size(cache)); |