The patch titled
Subject: arch/microblaze: add option to skip DMA sync as a part of map and unmap
has been removed from the -mm tree. Its filename was
arch-microblaze-add-option-to-skip-dma-sync-as-a-part-of-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/microblaze: 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/20161110113508.76501.77583.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Cc: Michal Simek <monstr@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/microblaze/kernel/dma.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff -puN arch/microblaze/kernel/dma.c~arch-microblaze-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap arch/microblaze/kernel/dma.c
--- a/arch/microblaze/kernel/dma.c~arch-microblaze-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap
+++ a/arch/microblaze/kernel/dma.c
@@ -61,6 +61,10 @@ static int dma_direct_map_sg(struct devi
/* FIXME this part of code is untested */
for_each_sg(sgl, sg, nents, i) {
sg->dma_address = sg_phys(sg);
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
__dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
sg->length, direction);
}
@@ -80,7 +84,8 @@ static inline dma_addr_t dma_direct_map_
enum dma_data_direction direction,
unsigned long attrs)
{
- __dma_sync(page_to_phys(page) + offset, size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ __dma_sync(page_to_phys(page) + offset, size, direction);
return page_to_phys(page) + offset;
}
@@ -95,7 +100,8 @@ static inline void dma_direct_unmap_page
* phys_to_virt is here because in __dma_sync_page is __virt_to_phys and
* dma_address is physical address
*/
- __dma_sync(dma_address, size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ __dma_sync(dma_address, size, direction);
}
static inline void
_
Patches currently in -mm which might be from alexander.h.duyck@xxxxxxxxx are
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