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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-14 15:05:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:07 -0800 |
| commit | 043b42bcbbc6bc87c457b156041d74d51f6cebc2 (patch) | |
| tree | 87e9acd3f3dc9bac84f20225c062c71825b3d932 | |
| parent | abdf4799dac6210e3d09d368c4ed19e984c45dce (diff) | |
| download | linux-043b42bcbbc6bc87c457b156041d74d51f6cebc2.tar.bz2 | |
arch/openrisc: 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
via a sync_for_cpu or sync_for_device call.
Link: http://lkml.kernel.org/r/20161110113524.76501.87966.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Jonas Bonn <jonas@southpole.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/openrisc/kernel/dma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index 140c99140649..906998bac957 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -141,6 +141,9 @@ or1k_map_page(struct device *dev, struct page *page, unsigned long cl; dma_addr_t addr = page_to_phys(page) + offset; + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return addr; + switch (dir) { case DMA_TO_DEVICE: /* Flush the dcache for the requested range */ |