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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>
This commit is contained in:
Alexander Duyck 2016-12-14 15:05:03 -08:00 committed by Linus Torvalds
parent abdf4799da
commit 043b42bcbb
1 changed files with 3 additions and 0 deletions
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3
arch/openrisc/kernel/dma.c
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@ -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 */