diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-08-27 10:12:57 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2017-10-19 16:37:25 +0200 |
| commit | 64dc8700c01d94c46fd26b38b7e7d2891934a33b (patch) | |
| tree | e92980b34228b26ed64930f26e2a471914e61776 /arch/microblaze/kernel | |
| parent | 562437a81aa48e54231896ad36d46439278df4b3 (diff) | |
microblaze: make dma_cache_sync a no-op
microblaze does not implement DMA_ATTR_NON_CONSISTENT allocations, so it
doesn't make any sense to do any work in dma_cache_sync given that it
must be a no-op when dma_alloc_attrs returns coherent memory.
This also allows moving __dma_sync out of the microblaze asm/dma-mapping.h
and thus greatly reduce the amount of includes there.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Diffstat (limited to 'arch/microblaze/kernel')
| -rw-r--r-- | arch/microblaze/kernel/dma.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c index 94700c5270a9..e52b684f8ea2 100644 --- a/arch/microblaze/kernel/dma.c +++ b/arch/microblaze/kernel/dma.c @@ -12,6 +12,7 @@ #include <linux/dma-debug.h> #include <linux/export.h> #include <linux/bug.h> +#include <asm/cacheflush.h> #define NOT_COHERENT_CACHE @@ -51,6 +52,22 @@ static void dma_direct_free_coherent(struct device *dev, size_t size, #endif } +static inline void __dma_sync(unsigned long paddr, + size_t size, enum dma_data_direction direction) +{ + switch (direction) { + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + flush_dcache_range(paddr, paddr + size); + break; + case DMA_FROM_DEVICE: + invalidate_dcache_range(paddr, paddr + size); + break; + default: + BUG(); + } +} + static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction, unsigned long attrs) |