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

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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>
This commit is contained in:
Alexander Duyck
2016-12-14 15:05:15 -08:00
committed by Linus Torvalds
parent a08120017d
commit 68bbc28f61
2 changed files with 4 additions and 4 deletions
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4
arch/sparc/kernel/iommu.c
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@@ -415,7 +415,7 @@ static void dma_4u_unmap_page(struct device *dev, dma_addr_t bus_addr,
ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
/* Step 1: Kick data out of streaming buffers if necessary. */
if (strbuf->strbuf_enabled)
if (strbuf->strbuf_enabled && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
strbuf_flush(strbuf, iommu, bus_addr, ctx,
npages, direction);
@@ -640,7 +640,7 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
base = iommu->page_table + entry;
dma_handle &= IO_PAGE_MASK;
if (strbuf->strbuf_enabled)
if (strbuf->strbuf_enabled && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
strbuf_flush(strbuf, iommu, dma_handle, ctx,
npages, direction);