diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-15 00:04:43 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-15 01:04:07 +0100 |
| commit | 34f8be79a772094a96da83f52f247cff2bc13978 (patch) | |
| tree | 570449c652fbe73fb541b42408959e1a4324013d /arch/frv/mb93090-mb00/pci-dma.c | |
| parent | arch/c6x: add option to skip sync on DMA map and unmap (diff) | |
| download | linux-34f8be79a772094a96da83f52f247cff2bc13978.tar.xz linux-34f8be79a772094a96da83f52f247cff2bc13978.zip | |
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.c')
| -rw-r--r-- | arch/frv/mb93090-mb00/pci-dma.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c index f585745b1abc..dba7df918144 100644 --- a/arch/frv/mb93090-mb00/pci-dma.c +++ b/arch/frv/mb93090-mb00/pci-dma.c @@ -40,13 +40,16 @@ static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction, unsigned long attrs) { + struct scatterlist *sg; unsigned long dampr2; void *vaddr; int i; - struct scatterlist *sg; BUG_ON(direction == DMA_NONE); + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return nents; + dampr2 = __get_DAMPR(2); for_each_sg(sglist, sg, nents, i) { @@ -70,7 +73,9 @@ static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - flush_dcache_page(page); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; } |