arch/tile: add option to skip DMA sync as a part of map and unmap (33c77e53) · Commits · 戴 / test

arch/tile/kernel/pci-dma.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -213,10 +213,12 @@ static int tile_dma_map_sg(struct device dev, struct scatterlist sglist,

		for_each_sg(sglist, sg, nents, i) {
		sg->dma_address = sg_phys(sg);
		__dma_prep_pa_range(sg->dma_address, sg->length, direction);
		#ifdef CONFIG_NEED_SG_DMA_LENGTH
		sg->dma_length = sg->length;
		#endif
		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
		continue;
		__dma_prep_pa_range(sg->dma_address, sg->length, direction);
		}

		return nents;
		@@ -232,6 +234,8 @@ static void tile_dma_unmap_sg(struct device dev, struct scatterlist sglist,
		BUG_ON(!valid_dma_direction(direction));
		for_each_sg(sglist, sg, nents, i) {
		sg->dma_address = sg_phys(sg);
		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
		continue;
		__dma_complete_pa_range(sg->dma_address, sg->length,
		direction);
		}
		@@ -245,6 +249,7 @@ static dma_addr_t tile_dma_map_page(struct device dev, struct page page,
		BUG_ON(!valid_dma_direction(direction));

		BUG_ON(offset + size > PAGE_SIZE);
		if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
		__dma_prep_page(page, offset, size, direction);

		return page_to_pa(page) + offset;
		@@ -256,6 +261,9 @@ static void tile_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
		{
		BUG_ON(!valid_dma_direction(direction));

		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
		return;

		__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
		dma_address & (PAGE_SIZE - 1), size, direction);
		}