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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-06-20 11:00:15 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-21 08:01:53 +0200 |
| commit | 074c2eae3e9b66c03a17a12df8f2cd19382b68ab (patch) | |
| tree | 1606baa1df8093b5ca0ef638236b2ace837e1d98 /arch/powerpc/include/asm/tlbflush.h | |
| parent | powerpc/THP: Double the PMD table size for THP (diff) | |
| download | linux-074c2eae3e9b66c03a17a12df8f2cd19382b68ab.tar.xz linux-074c2eae3e9b66c03a17a12df8f2cd19382b68ab.zip | |
powerpc/THP: Implement transparent hugepages for ppc64
We now have pmd entries covering 16MB range and the PMD table double its original size.
We use the second half of the PMD table to deposit the pgtable (PTE page).
The depoisted PTE page is further used to track the HPTE information. The information
include [ secondary group | 3 bit hidx | valid ]. We use one byte per each HPTE entry.
With 16MB hugepage and 64K HPTE we need 256 entries and with 4K HPTE we need
4096 entries. Both will fit in a 4K PTE page. On hugepage invalidate we need to walk
the PTE page and invalidate all valid HPTEs.
This patch implements necessary arch specific functions for THP support and also
hugepage invalidate logic. These PMD related functions are intentionally kept
similar to their PTE counter-part.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/tlbflush.h')
| -rw-r--r-- | arch/powerpc/include/asm/tlbflush.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/tlbflush.h b/arch/powerpc/include/asm/tlbflush.h index 61a59271665b..2def01ed0cb2 100644 --- a/arch/powerpc/include/asm/tlbflush.h +++ b/arch/powerpc/include/asm/tlbflush.h @@ -165,7 +165,8 @@ static inline void flush_tlb_kernel_range(unsigned long start, /* Private function for use by PCI IO mapping code */ extern void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, unsigned long end); - +extern void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd, + unsigned long addr); #else #error Unsupported MMU type #endif |