arch/sparc: 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/20161110113544.76501.40008.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -415,7 +415,7 @@ static void dma_4u_unmap_page(struct device *dev, dma_addr_t bus_addr,
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ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
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/* Step 1: Kick data out of streaming buffers if necessary. */
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if (strbuf->strbuf_enabled)
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if (strbuf->strbuf_enabled && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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strbuf_flush(strbuf, iommu, bus_addr, ctx,
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npages, direction);
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@ -640,7 +640,7 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
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base = iommu->page_table + entry;
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dma_handle &= IO_PAGE_MASK;
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if (strbuf->strbuf_enabled)
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if (strbuf->strbuf_enabled && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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strbuf_flush(strbuf, iommu, dma_handle, ctx,
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npages, direction);
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@ -527,7 +527,7 @@ static dma_addr_t pci32_map_page(struct device *dev, struct page *page,
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static void pci32_unmap_page(struct device *dev, dma_addr_t ba, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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if (dir != PCI_DMA_TODEVICE)
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if (dir != PCI_DMA_TODEVICE && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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dma_make_coherent(ba, PAGE_ALIGN(size));
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}
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@ -572,7 +572,7 @@ static void pci32_unmap_sg(struct device *dev, struct scatterlist *sgl,
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struct scatterlist *sg;
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int n;
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if (dir != PCI_DMA_TODEVICE) {
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if (dir != PCI_DMA_TODEVICE && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
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for_each_sg(sgl, sg, nents, n) {
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dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
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}
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