path: root/arch/powerpc/mm/hash_utils_64.c
diff options
authorJon Tollefson <kniht@linux.vnet.ibm.com>2008-07-23 21:27:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:19 -0700
commit0d9ea75443dc7e37843e656b8ebc947a6d16d618 (patch)
tree4eb47a4468a92c90a90873d1646196955b487996 /arch/powerpc/mm/hash_utils_64.c
parentf4a67cceee4a6f5ed38011a698c9e34747270ae5 (diff)
powerpc: support multiple hugepage sizes
Instead of using the variable mmu_huge_psize to keep track of the huge page size we use an array of MMU_PAGE_* values. For each supported huge page size we need to know the hugepte_shift value and have a pgtable_cache. The hstate or an mmu_huge_psizes index is passed to functions so that they know which huge page size they should use. The hugepage sizes 16M and 64K are setup(if available on the hardware) so that they don't have to be set on the boot cmd line in order to use them. The number of 16G pages have to be specified at boot-time though (e.g. hugepagesz=16G hugepages=5). 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/hash_utils_64.c')
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index ae4c717243a..5ce5a4dcd00 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -103,7 +103,6 @@ int mmu_kernel_ssize = MMU_SEGSIZE_256M;
int mmu_highuser_ssize = MMU_SEGSIZE_256M;
u16 mmu_slb_size = 64;
-int mmu_huge_psize = MMU_PAGE_16M;
unsigned int HPAGE_SHIFT;
@@ -460,15 +459,15 @@ static void __init htab_init_page_sizes(void)
/* Reserve 16G huge page memory sections for huge pages */
of_scan_flat_dt(htab_dt_scan_hugepage_blocks, NULL);
-/* Init large page size. Currently, we pick 16M or 1M depending
+/* Set default large page size. Currently, we pick 16M or 1M depending
* on what is available
if (mmu_psize_defs[MMU_PAGE_16M].shift)
- set_huge_psize(MMU_PAGE_16M);
+ HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift;
/* 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)
- set_huge_psize(MMU_PAGE_1M);
+ HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift;
@@ -889,7 +888,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
/* Handle hugepage regions */
- if (HPAGE_SHIFT && psize == mmu_huge_psize) {
+ if (HPAGE_SHIFT && mmu_huge_psizes[psize]) {
DBG_LOW(" -> huge page !\n");
return hash_huge_page(mm, access, ea, vsid, local, trap);