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| author |   Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-14 15:05:23 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:08 -0800 |
| commit | 0495c3d367944e4af053983ff3cdf256b567b053 (patch) | |
| tree | 7d7418b6377cc4a8d6db54bcd9da8d40e998bf45 /kernel/sysctl.c | |
| parent | arch/xtensa: add option to skip DMA sync as a part of mapping (diff) | |
| download | wireguard-linux-0495c3d367944e4af053983ff3cdf256b567b053.tar.xz wireguard-linux-0495c3d367944e4af053983ff3cdf256b567b053.zip | |
dma: add calls for dma_map_page_attrs and dma_unmap_page_attrs
Add support for mapping and unmapping a page with attributes.
The primary use for this is currently to allow for us to pass the
DMA_ATTR_SKIP_CPU_SYNC attribute when mapping and unmapping a page. On
some architectures such as ARM the synchronization has significant
overhead and if we are already taking care of the sync_for_cpu and
sync_for_device from the driver there isn't much need to handle this in
the map/unmap calls as well.
Link: http://lkml.kernel.org/r/20161110113601.76501.46095.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl.c')
0 files changed, 0 insertions, 0 deletions