The patch titled
Subject: arch/c6x: add option to skip sync on DMA map and unmap
has been removed from the -mm tree. Its filename was
arch-c6x-add-option-to-skip-sync-on-dma-map-and-unmap.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Subject: arch/c6x: add option to skip sync on DMA 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
later via a sync_for_cpu or sync_for_device call.
Link: http://lkml.kernel.org/r/20161110113442.76501.7673.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Acked-by: Mark Salter <msalter@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/c6x/kernel/dma.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff -puN arch/c6x/kernel/dma.c~arch-c6x-add-option-to-skip-sync-on-dma-map-and-unmap arch/c6x/kernel/dma.c
--- a/arch/c6x/kernel/dma.c~arch-c6x-add-option-to-skip-sync-on-dma-map-and-unmap
+++ a/arch/c6x/kernel/dma.c
@@ -42,14 +42,17 @@ static dma_addr_t c6x_dma_map_page(struc
{
dma_addr_t handle = virt_to_phys(page_address(page) + offset);
- c6x_dma_sync(handle, size, dir);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ c6x_dma_sync(handle, size, dir);
+
return handle;
}
static void c6x_dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
- c6x_dma_sync(handle, size, dir);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ c6x_dma_sync(handle, size, dir);
}
static int c6x_dma_map_sg(struct device *dev, struct scatterlist *sglist,
@@ -60,7 +63,8 @@ static int c6x_dma_map_sg(struct device
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
- c6x_dma_sync(sg->dma_address, sg->length, dir);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ c6x_dma_sync(sg->dma_address, sg->length, dir);
}
return nents;
@@ -72,9 +76,11 @@ static void c6x_dma_unmap_sg(struct devi
struct scatterlist *sg;
int i;
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return;
+
for_each_sg(sglist, sg, nents, i)
c6x_dma_sync(sg_dma_address(sg), sg->length, dir);
-
}
static void c6x_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
_
Patches currently in -mm which might be from alexander.h.duyck@xxxxxxxxx are
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