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powerpc: define support for 16G hugepages 

The huge page size is defined for 16G pages.  If a hugepagesz of 16G is
specified at boot-time then it becomes the huge page size instead of the
default 16M.

The change in pgtable-64K.h is to the macro pte_iterate_hashed_subpages to
make the increment to va (the 1 being shifted) be a long so that it is not
shifted to 0.  Otherwise it would create an infinite loop when the shift
value is for a 16G page (when base page size is 64K).

Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jon Tollefson 2008-07-23 21:27:55 -07:00 committed by Linus Torvalds
parent 658013e93e
commit 91224346aa
2 changed files with 45 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
arch/powerpc/mm/hugetlbpage.c
View File

@ -24,8 +24,9 @@
#include <asm/cputable.h>
#include <asm/spu.h>
#define HPAGE_SHIFT_64K 16
#define HPAGE_SHIFT_16M 24
#define PAGE_SHIFT_64K 16
#define PAGE_SHIFT_16M 24
#define PAGE_SHIFT_16G 34
#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
@ -95,7 +96,7 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
static inline
pmd_t *hpmd_offset(pud_t *pud, unsigned long addr)
{
if (HPAGE_SHIFT == HPAGE_SHIFT_64K)
if (HPAGE_SHIFT == PAGE_SHIFT_64K)
return pmd_offset(pud, addr);
else
return (pmd_t *) pud;
@ -103,7 +104,7 @@ pmd_t *hpmd_offset(pud_t *pud, unsigned long addr)
static inline
pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
{
if (HPAGE_SHIFT == HPAGE_SHIFT_64K)
if (HPAGE_SHIFT == PAGE_SHIFT_64K)
return pmd_alloc(mm, pud, addr);
else
return (pmd_t *) pud;
@ -260,7 +261,7 @@ 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 (HPAGE_SHIFT == HPAGE_SHIFT_64K) {
if (HPAGE_SHIFT == PAGE_SHIFT_64K) {
if (pud_none_or_clear_bad(pud))
continue;
hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling);
@ -592,20 +593,40 @@ 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 &&
if (mmu_psize_defs[psize].shift &&
mmu_psize_defs[psize].shift < SID_SHIFT_1T &&
(mmu_psize_defs[psize].shift > MIN_HUGEPTE_SHIFT ||
mmu_psize_defs[psize].shift == HPAGE_SHIFT_64K)) {
mmu_psize_defs[psize].shift == PAGE_SHIFT_64K ||
mmu_psize_defs[psize].shift == PAGE_SHIFT_16G)) {
/* Return if huge page size is the same as the
* base page size. */
if (mmu_psize_defs[psize].shift == PAGE_SHIFT)
return;
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
switch (HPAGE_SHIFT) {
case PAGE_SHIFT_64K:
/* We only allow 64k hpages with 4k base page,
* which was checked above, and always put them
* at the PMD */
hugepte_shift = PMD_SHIFT;
break;
case PAGE_SHIFT_16M:
/* 16M pages can be at two different levels
* of pagestables based on base page size */
if (PAGE_SHIFT == PAGE_SHIFT_64K)
hugepte_shift = PMD_SHIFT;
else /* 4k base page */
hugepte_shift = PUD_SHIFT;
break;
case PAGE_SHIFT_16G:
/* 16G pages are always at PGD level */
hugepte_shift = PGDIR_SHIFT;
break;
}
hugepte_shift -= HPAGE_SHIFT;
} else
HPAGE_SHIFT = 0;
}
@ -621,17 +642,22 @@ static int __init hugepage_setup_sz(char *str)
shift = __ffs(size);
switch (shift) {
#ifndef CONFIG_PPC_64K_PAGES
case HPAGE_SHIFT_64K:
case PAGE_SHIFT_64K:
mmu_psize = MMU_PAGE_64K;
break;
#endif
case HPAGE_SHIFT_16M:
case PAGE_SHIFT_16M:
mmu_psize = MMU_PAGE_16M;
break;
case PAGE_SHIFT_16G:
mmu_psize = MMU_PAGE_16G;
break;
}
if (mmu_psize >=0 && mmu_psize_defs[mmu_psize].shift)
if (mmu_psize >= 0 && mmu_psize_defs[mmu_psize].shift) {
set_huge_psize(mmu_psize);
hugetlb_add_hstate(shift - PAGE_SHIFT);
}
else
printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size);

2
include/asm-powerpc/pgtable-64k.h
View File

@ -138,7 +138,7 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd)
unsigned __split = (psize == MMU_PAGE_4K || \
psize == MMU_PAGE_64K_AP); \
shift = mmu_psize_defs[psize].shift; \
for (index = 0; va < __end; index++, va += (1 << shift)) { \
for (index = 0; va < __end; index++, va += (1L << shift)) { \
if (!__split || __rpte_sub_valid(rpte, index)) do { \
#define pte_iterate_hashed_end() } while(0); } } while(0)