diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-14 15:04:43 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:07 -0800 |
| commit | 34f8be79a772094a96da83f52f247cff2bc13978 (patch) | |
| tree | 570449c652fbe73fb541b42408959e1a4324013d /arch/frv/mb93090-mb00/pci-dma-nommu.c | |
| parent | 64c596b59c726514f548e15f13a87010efbff40d (diff) | |
arch/frv: add option to skip sync on DMA map
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.
Link: http://lkml.kernel.org/r/20161110113447.76501.93160.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/frv/mb93090-mb00/pci-dma-nommu.c')
| -rw-r--r-- | arch/frv/mb93090-mb00/pci-dma-nommu.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c index 90f2e4cb33d6..187688128c65 100644 --- a/arch/frv/mb93090-mb00/pci-dma-nommu.c +++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c @@ -109,16 +109,19 @@ static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction, unsigned long attrs) { - int i; struct scatterlist *sg; + int i; + + BUG_ON(direction == DMA_NONE); + + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return nents; for_each_sg(sglist, sg, nents, i) { frv_cache_wback_inv(sg_dma_address(sg), sg_dma_address(sg) + sg_dma_len(sg)); } - BUG_ON(direction == DMA_NONE); - return nents; } @@ -127,7 +130,10 @@ static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, enum dma_data_direction direction, unsigned long attrs) { BUG_ON(direction == DMA_NONE); - flush_dcache_page(page); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; } |