diff options
| author | Laura Abbott <lauraa@codeaurora.org> | 2014-08-05 19:39:38 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:04:00 -0700 |
| commit | 67097c72247a4ed0ee8d48c849edfeee2624cbea (patch) | |
| tree | f7e08663359ed3f30d2264b66df09d5861f84a1d /include/linux | |
| parent | 793d80f988e2ce1d430f72fae066df9446316d60 (diff) | |
arm: Add option to skip buffer zeroing
The DMA framework currently zeros all buffers because it (righfully so)
assumes that drivers will soon need to pass the memory to a device.
Some devices/use case may not require zeroed memory and there can
be an increase in performance if we skip the zeroing. Add a DMA_ATTR
to allow skipping of DMA zeroing.
Change-Id: Id9ccab355554b3163d8e7eae1caa82460e171e34
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[mitchelh: dropped changes to arm32]
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dma-attrs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h index 29bd0a909bc8..eb1b9d727f39 100644 --- a/include/linux/dma-attrs.h +++ b/include/linux/dma-attrs.h @@ -19,6 +19,7 @@ enum dma_attr { DMA_ATTR_SKIP_CPU_SYNC, DMA_ATTR_FORCE_CONTIGUOUS, DMA_ATTR_STRONGLY_ORDERED, + DMA_ATTR_SKIP_ZEROING, DMA_ATTR_MAX, }; |