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| author | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-11 14:33:12 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-05-15 14:29:55 +0200 |
| commit | ebc7e21e0fa28c46b938baed292c77e2d3ef8165 (patch) | |
| tree | fa415205a2ea1ff232aee0b7a6c4e998837b77ef /arch/arm64/include/asm | |
| parent | Revert "arm64: Increase the max granular size" (diff) | |
| download | linux-ebc7e21e0fa28c46b938baed292c77e2d3ef8165.tar.xz linux-ebc7e21e0fa28c46b938baed292c77e2d3ef8165.zip | |
arm64: Increase ARCH_DMA_MINALIGN to 128
This patch increases the ARCH_DMA_MINALIGN to 128 so that it covers the
currently known Cache Writeback Granule (CTR_EL0.CWG) on arm64 and moves
the fallback in cache_line_size() from L1_CACHE_BYTES to this constant.
In addition, it warns (and taints) if the CWG is larger than
ARCH_DMA_MINALIGN as this is not safe with non-coherent DMA.
Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/cache.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h index 1dd2c2db0010..5df5cfe1c143 100644 --- a/arch/arm64/include/asm/cache.h +++ b/arch/arm64/include/asm/cache.h @@ -43,7 +43,7 @@ * cache before the transfer is done, causing old data to be seen by * the CPU. */ -#define ARCH_DMA_MINALIGN L1_CACHE_BYTES +#define ARCH_DMA_MINALIGN (128) #ifndef __ASSEMBLY__ @@ -77,7 +77,7 @@ static inline u32 cache_type_cwg(void) static inline int cache_line_size(void) { u32 cwg = cache_type_cwg(); - return cwg ? 4 << cwg : L1_CACHE_BYTES; + return cwg ? 4 << cwg : ARCH_DMA_MINALIGN; } #endif /* __ASSEMBLY__ */ |