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powerpc: Update hugetlb huge_pte_alloc and tablewalk code for FSL BOOKE

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This updates the hugetlb page table code to handle 64-bit FSL_BOOKE.
The previous 32-bit work counted on the inner levels of the page table
collapsing.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2011-10-10 10:50:39 +00:00 committed by Benjamin Herrenschmidt
parent 8c1674de2b
commit a1cd541988
1 changed files with 42 additions and 6 deletions
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48
arch/powerpc/mm/hugetlbpage.c
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@ -155,11 +155,28 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
hpdp->pd = 0;
kmem_cache_free(cachep, new);
}
#else
if (!hugepd_none(*hpdp))
kmem_cache_free(cachep, new);
else
hpdp->pd = ((unsigned long)new & ~PD_HUGE) | pshift;
#endif
spin_unlock(&mm->page_table_lock);
return 0;
}
/*
* These macros define how to determine which level of the page table holds
* the hpdp.
*/
#ifdef CONFIG_PPC_FSL_BOOK3E
#define HUGEPD_PGD_SHIFT PGDIR_SHIFT
#define HUGEPD_PUD_SHIFT PUD_SHIFT
#else
#define HUGEPD_PGD_SHIFT PUD_SHIFT
#define HUGEPD_PUD_SHIFT PMD_SHIFT
#endif
pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
{
pgd_t *pg;
@ -172,12 +189,13 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz
addr &= ~(sz-1);
pg = pgd_offset(mm, addr);
if (pshift >= PUD_SHIFT) {
if (pshift >= HUGEPD_PGD_SHIFT) {
hpdp = (hugepd_t *)pg;
} else {
pdshift = PUD_SHIFT;
pu = pud_alloc(mm, pg, addr);
if (pshift >= PMD_SHIFT) {
if (pshift >= HUGEPD_PUD_SHIFT) {
hpdp = (hugepd_t *)pu;
} else {
pdshift = PMD_SHIFT;
@ -453,14 +471,23 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
unsigned long start;
start = addr;
pmd = pmd_offset(pud, addr);
do {
pmd = pmd_offset(pud, addr);
next = pmd_addr_end(addr, end);
if (pmd_none(*pmd))
continue;
#ifdef CONFIG_PPC_FSL_BOOK3E
/*
* Increment next by the size of the huge mapping since
* there may be more than one entry at this level for a
* single hugepage, but all of them point to
* the same kmem cache that holds the hugepte.
*/
next = addr + (1 << hugepd_shift(*(hugepd_t *)pmd));
#endif
free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT,
addr, next, floor, ceiling);
} while (pmd++, addr = next, addr != end);
} while (addr = next, addr != end);
start &= PUD_MASK;
if (start < floor)
@ -487,8 +514,8 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
unsigned long start;
start = addr;
pud = pud_offset(pgd, addr);
do {
pud = pud_offset(pgd, addr);
next = pud_addr_end(addr, end);
if (!is_hugepd(pud)) {
if (pud_none_or_clear_bad(pud))
@ -496,10 +523,19 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
ceiling);
} else {
#ifdef CONFIG_PPC_FSL_BOOK3E
/*
* Increment next by the size of the huge mapping since
* there may be more than one entry at this level for a
* single hugepage, but all of them point to
* the same kmem cache that holds the hugepte.
*/
next = addr + (1 << hugepd_shift(*(hugepd_t *)pud));
#endif
free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT,
addr, next, floor, ceiling);
}
} while (pud++, addr = next, addr != end);
} while (addr = next, addr != end);
start &= PGDIR_MASK;
if (start < floor)