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Subject[net-next PATCH 11/27] arch/m68k: Add option to skip DMA sync as a part of mapping
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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
later via a sync_for_cpu or sync_for_device call.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
arch/m68k/kernel/dma.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
index 8cf97cb..0707006 100644
--- a/arch/m68k/kernel/dma.c
+++ b/arch/m68k/kernel/dma.c
@@ -134,7 +134,9 @@ static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
{
dma_addr_t handle = page_to_phys(page) + offset;

- dma_sync_single_for_device(dev, handle, size, dir);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_sync_single_for_device(dev, handle, size, dir);
+
return handle;
}

@@ -146,6 +148,10 @@ static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,

for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
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