diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 33121d6c827c6e5fcc85d72b1f5ee5f166b743a2..2fc1fb896afce11e356860462b3372a6e802a4d1 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -685,6 +685,7 @@ and is between 256 and 4096 characters. It is defined in the file
See Documentation/isdn/README.HiSax.
hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages.
+ hugepagesz= [HW,IA-64,PPC] The size of the HugeTLB pages.
i8042.direct [HW] Put keyboard port into non-translated mode
i8042.dumbkbd [HW] Pretend that controller can only read data from
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index cbbd8b0bc8f4070d37243491be3e3a0025be88d6..9326a6962b42987ab991c412760a70d8f49a10cd 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -369,18 +369,11 @@ static void __init htab_init_page_sizes(void)
* on what is available
*/
if (mmu_psize_defs[MMU_PAGE_16M].shift)
- mmu_huge_psize = MMU_PAGE_16M;
+ set_huge_psize(MMU_PAGE_16M);
/* With 4k/4level pagetables, we can't (for now) cope with a
* huge page size < PMD_SIZE */
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
- mmu_huge_psize = MMU_PAGE_1M;
-
- /* Calculate HPAGE_SHIFT and sanity check it */
- if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
- mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
- HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
- else
- HPAGE_SHIFT = 0; /* No huge pages dude ! */
+ set_huge_psize(MMU_PAGE_1M);
#endif /* CONFIG_HUGETLB_PAGE */
}
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 71efb38d599be75490f61ca929a160ea8f86ab8c..a02266dad215cc3d1065b69e542bf48f8e2e27be 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 @@ int hash_huge_page(struct mm_struct *mm, unsigned long access,
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));
diff --git a/include/asm-powerpc/mmu-hash64.h b/include/asm-powerpc/mmu-hash64.h
index f2d7d5ded2e5d3b9d30a7da64dda87f47252ef4e..2a1b4040e20d505801b09bcc0254bb652ae635e3 100644
--- a/include/asm-powerpc/mmu-hash64.h
+++ b/include/asm-powerpc/mmu-hash64.h
@@ -278,6 +278,7 @@ extern int hash_huge_page(struct mm_struct *mm, unsigned long access,
extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
unsigned long pstart, unsigned long mode,
int psize, int ssize);
+extern void set_huge_psize(int psize);
extern void htab_initialize(void);
extern void htab_initialize_secondary(void);