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Commit 98ac2fc2 authored by Alexander Duyck's avatar Alexander Duyck Committed by Linus Torvalds
Browse files

arch/microblaze: add option to skip DMA sync as a part of map and unmap 

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/20161110113508.76501.77583.stgit@ahduyck-blue-test.jf.intel.com


Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 38bdbdc7

arch/microblaze/kernel/dma.c

+8 −2
Original line number Diff line number Diff line
@@ -61,6 +61,10 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, 
	/* FIXME this part of code is untested */

	for_each_sg(sgl, sg, nents, i) {

		sg->dma_address = sg_phys(sg);



		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

			continue;



		__dma_sync(page_to_phys(sg_page(sg)) + sg->offset,

							sg->length, direction);

	}
@@ -80,6 +84,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev, 
					     enum dma_data_direction direction,

					     unsigned long attrs)

{

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		__dma_sync(page_to_phys(page) + offset, size, direction);

	return page_to_phys(page) + offset;

}
@@ -95,6 +100,7 @@ static inline void dma_direct_unmap_page(struct device *dev, 
 * phys_to_virt is here because in __dma_sync_page is __virt_to_phys and

 * dma_address is physical address

 */

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		__dma_sync(dma_address, size, direction);

}