From 64dc8700c01d94c46fd26b38b7e7d2891934a33b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 27 Aug 2017 10:12:57 +0200 Subject: 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 Reviewed-by: Robin Murphy --- arch/microblaze/kernel/dma.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'arch/microblaze/kernel') 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 #include #include +#include #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) -- cgit v1.2.3