The patch titled
Subject: arch/tile: add option to skip DMA sync as a part of map and unmap
has been added to the -mm tree. Its filename is
arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
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------------------------------------------------------
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Subject: arch/tile: 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/20161110113550.76501.73060.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/tile/kernel/pci-dma.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN arch/tile/kernel/pci-dma.c~arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap arch/tile/kernel/pci-dma.c
--- a/arch/tile/kernel/pci-dma.c~arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap
+++ a/arch/tile/kernel/pci-dma.c
@@ -213,10 +213,12 @@ static int tile_dma_map_sg(struct device
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
- __dma_prep_pa_range(sg->dma_address, sg->length, direction);
#ifdef CONFIG_NEED_SG_DMA_LENGTH
sg->dma_length = sg->length;
#endif
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+ __dma_prep_pa_range(sg->dma_address, sg->length, direction);
}
return nents;
@@ -232,6 +234,8 @@ static void tile_dma_unmap_sg(struct dev
BUG_ON(!valid_dma_direction(direction));
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
__dma_complete_pa_range(sg->dma_address, sg->length,
direction);
}
@@ -245,7 +249,8 @@ static dma_addr_t tile_dma_map_page(stru
BUG_ON(!valid_dma_direction(direction));
BUG_ON(offset + size > PAGE_SIZE);
- __dma_prep_page(page, offset, size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ __dma_prep_page(page, offset, size, direction);
return page_to_pa(page) + offset;
}
@@ -256,6 +261,9 @@ static void tile_dma_unmap_page(struct d
{
BUG_ON(!valid_dma_direction(direction));
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return;
+
__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
dma_address & (PAGE_SIZE - 1), size, direction);
}
_
Patches currently in -mm which might be from alexander.h.duyck@xxxxxxxxx are
arch-arc-add-option-to-skip-sync-on-dma-mapping.patch
arch-arm-add-option-to-skip-sync-on-dma-map-and-unmap.patch
arch-avr32-add-option-to-skip-sync-on-dma-map.patch
arch-blackfin-add-option-to-skip-sync-on-dma-map.patch
arch-c6x-add-option-to-skip-sync-on-dma-map-and-unmap.patch
arch-frv-add-option-to-skip-sync-on-dma-map.patch
arch-hexagon-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
arch-m68k-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
arch-metag-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-microblaze-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-mips-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-nios2-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-openrisc-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
arch-parisc-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-powerpc-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
arch-sh-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
arch-sparc-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-tile-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
arch-xtensa-add-option-to-skip-dma-sync-as-a-part-of-mapping.patch
dma-add-calls-for-dma_map_page_attrs-and-dma_unmap_page_attrs.patch
mm-add-support-for-releasing-multiple-instances-of-a-page.patch
igb-update-driver-to-make-use-of-dma_attr_skip_cpu_sync.patch
igb-update-code-to-better-handle-incrementing-page-count.patch
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