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/mm/proc-xsc3.S | |
| 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/mm/proc-xsc3.S')
| -rw-r--r-- | arch/arm/mm/proc-xsc3.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S index 755e1bf22681..1a2021cedc76 100644 --- a/arch/arm/mm/proc-xsc3.S +++ b/arch/arm/mm/proc-xsc3.S @@ -375,7 +375,7 @@ cpu_xsc3_mt_table: .long PTE_EXT_TEX(5) | PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED - .long 0x00 @ unused + .long PTE_EXT_TEX(4) | PTE_BUFFERABLE @ L_PTE_MT_INNER_WB (not present?) .long 0x00 @ L_PTE_MT_MINICACHE (not present) .long PTE_EXT_TEX(5) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC (not present?) .long 0x00 @ unused |