diff options
| author | Gary King <gking@nvidia.com> | 2010-09-15 09:49:24 -0700 |
|---|---|---|
| committer | Rebecca Schultz Zavin <rebecca@android.com> | 2010-10-08 15:59:00 -0700 |
| commit | fb382752691d74a849996daf77be961ca2cdae97 (patch) | |
| tree | ff279e558d7af9c4787cce0c0a1127788a99ab12 /arch/arm/include | |
| parent | 8419248010c866bb8894340c6d2d08d016f54ed2 (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>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index e90b167ea848..73ee18b1a054 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -184,6 +184,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define L_PTE_MT_DEV_NONSHARED (0x0c << 2) /* 1100 */ #define L_PTE_MT_DEV_WC (0x09 << 2) /* 1001 */ #define L_PTE_MT_DEV_CACHED (0x0b << 2) /* 1011 */ +#define L_PTE_MT_INNER_WB (0x05 << 2) /* 0101 (armv6, armv7) */ #define L_PTE_MT_MASK (0x0f << 2) #ifndef __ASSEMBLY__ @@ -325,6 +326,8 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, #define pgprot_dmacoherent(prot) \ __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED) #endif +#define pgprot_inner_writeback(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_INNER_WB) #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_present(pmd) (pmd_val(pmd)) |