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authorJon Tollefson <kniht@linux.vnet.ibm.com>2008-07-24 00:27:53 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:19 -0400
commitec4b2c0c8312d1118c2acd00c89988ecf955d5cc (patch)
tree279b4fe868e774b14689688779d6dad54456b09a /arch/powerpc/mm/hugetlbpage.c
parent53ba51d21d6e048424ab8aadfebdb1f25ae07b60 (diff)
powerpc: function to allocate gigantic hugepages
The 16G page locations have been saved during early boot in an array. The alloc_bootmem_huge_page() function adds a page from here to the huge_boot_pages list. Acked-by: Adam Litke <agl@us.ibm.com> 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>
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
-rw-r--r--arch/powerpc/mm/hugetlbpage.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 63db7adce717..5df82186fc93 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -29,6 +29,12 @@
29 29
30#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT) 30#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
31#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT) 31#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
32#define MAX_NUMBER_GPAGES 1024
33
34/* Tracks the 16G pages after the device tree is scanned and before the
35 * huge_boot_pages list is ready. */
36static unsigned long gpage_freearray[MAX_NUMBER_GPAGES];
37static unsigned nr_gpages;
32 38
33unsigned int hugepte_shift; 39unsigned int hugepte_shift;
34#define PTRS_PER_HUGEPTE (1 << hugepte_shift) 40#define PTRS_PER_HUGEPTE (1 << hugepte_shift)
@@ -104,6 +110,21 @@ pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
104} 110}
105#endif 111#endif
106 112
113/* Moves the gigantic page addresses from the temporary list to the
114 * huge_boot_pages list. */
115int alloc_bootmem_huge_page(struct hstate *h)
116{
117 struct huge_bootmem_page *m;
118 if (nr_gpages == 0)
119 return 0;
120 m = phys_to_virt(gpage_freearray[--nr_gpages]);
121 gpage_freearray[nr_gpages] = 0;
122 list_add(&m->list, &huge_boot_pages);
123 m->hstate = h;
124 return 1;
125}
126
127
107/* Modelled after find_linux_pte() */ 128/* Modelled after find_linux_pte() */
108pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 129pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
109{ 130{