[mm PATCH v3 04/23] arch/blackfin: Add option to skip sync on DMA map
From: Alexander Duyck <hidden>
Date: 2016-11-10 17:42:34
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the DMA APIs in the arch/arm folder. This change is meant to correct that so that we get consistent behavior. Cc: Steven Miao <redacted> Signed-off-by: Alexander Duyck <redacted> --- arch/blackfin/kernel/dma-mapping.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 53fbbb6..a27a74a 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c@@ -118,6 +118,10 @@ static int bfin_dma_map_sg(struct device *dev, struct scatterlist *sg_list, for_each_sg(sg_list, sg, nents, i) { sg->dma_address = (dma_addr_t) sg_virt(sg); + + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + continue; + __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction); }
@@ -143,7 +147,9 @@ static dma_addr_t bfin_dma_map_page(struct device *dev, struct page *page, { dma_addr_t handle = (dma_addr_t)(page_address(page) + offset); - _dma_sync(handle, size, dir); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + _dma_sync(handle, size, dir); + return handle; } --
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