diff options
| author | Colin Cross <ccross@android.com> | 2011-04-07 14:47:45 -0700 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:37:03 -0800 |
| commit | 8044175af9e16ae5f315029e629f84f88e78d1d4 (patch) | |
| tree | 2974dedc8f619dfd81c6be0b08fccfa2b65ecb8e /arch/arm/include | |
| parent | a6fe57bb9aa543f85754470f0d4d7636933bde69 (diff) | |
[ARM] mm: add memory type for inner-writeback
For streaming-style operations (e.g., software rendering of graphics
surfaces shared with non-coherent DMA devices), the cost of performing
L2 cache maintenance can exceed the benefit of having the larger cache
(this is particularly true for OUTER_CACHE configurations like the ARM
PL2x0).
This change uses the currently-unused mapping 5 (TEX[0]=1, C=0, B=1)
in the tex remapping tables as an inner-writeback-write-allocate, outer
non-cacheable memory type, so that this mapping will be available to
clients which will benefit from the reduced L2 maintenance.
Change-Id: Iaec3314a304eab2215100d991b1e880b676ac906
Signed-off-by: Gary King <gking@nvidia.com>
Conflicts:
arch/arm/include/asm/pgtable.h
arch/arm/mm/proc-v7.S
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 5750704e0271..6e68977529c0 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -189,6 +189,7 @@ extern void __pgd_error(const char *file, int line, pgd_t); #define L_PTE_MT_DEV_WC (_AT(pteval_t, 0x09) << 2) /* 1001 */ #define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 0x0b) << 2) /* 1011 */ #define L_PTE_MT_MASK (_AT(pteval_t, 0x0f) << 2) +#define L_PTE_MT_INNER_WB (_AT(pteval_t, 0x05) << 2) /* 0101 (armv6, armv7) */ #ifndef __ASSEMBLY__ @@ -244,6 +245,9 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN) #endif +#define pgprot_inner_writeback(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_INNER_WB) + #endif /* __ASSEMBLY__ */ /* |