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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-15 00:04:46 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-15 01:04:07 +0100 |
| commit | b8a346dd472af45e1ee8cbc77101dad0b836210b (patch) | |
| tree | 8da5660153e97d6f8094c89fceaafdbfb2c4d9a7 /arch | |
| parent | arch/frv: add option to skip sync on DMA map (diff) | |
| download | linux-b8a346dd472af45e1ee8cbc77101dad0b836210b.tar.xz linux-b8a346dd472af45e1ee8cbc77101dad0b836210b.zip | |
arch/hexagon: Add option to skip DMA sync as a part of mapping
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to
avoid invoking cache line invalidation if the driver will just handle it
later via a sync_for_cpu or sync_for_device call.
Link: http://lkml.kernel.org/r/20161110113452.76501.45864.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/hexagon/kernel/dma.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c index b9017785fb71..dbc4f1003da4 100644 --- a/arch/hexagon/kernel/dma.c +++ b/arch/hexagon/kernel/dma.c @@ -119,6 +119,9 @@ static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg, s->dma_length = s->length; + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + continue; + flush_dcache_range(dma_addr_to_virt(s->dma_address), dma_addr_to_virt(s->dma_address + s->length)); } @@ -180,7 +183,8 @@ static dma_addr_t hexagon_map_page(struct device *dev, struct page *page, if (!check_addr("map_single", dev, bus, size)) return bad_dma_address; - dma_sync(dma_addr_to_virt(bus), size, dir); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + dma_sync(dma_addr_to_virt(bus), size, dir); return bus; } |