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Commit b8a346dd authored by Alexander Duyck's avatar Alexander Duyck Committed by Linus Torvalds
Browse files

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: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 34f8be79

arch/hexagon/kernel/dma.c

+5 −1
Original line number Diff line number Diff line
@@ -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));

	}
@@ -180,6 +183,7 @@ 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;



	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		dma_sync(dma_addr_to_virt(bus), size, dir);



	return bus;