The patch titled
Subject: arch/nios2: add option to skip DMA sync as a part of map and unmap
has been added to the -mm tree. Its filename is
arch-nios2-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-nios2-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-nios2-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Subject: arch/nios2: 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/20161110113518.76501.52225.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Reviewed-by: Tobias Klauser <tklauser@xxxxxxxxxx>
Cc: Ley Foon Tan <lftan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/nios2/mm/dma-mapping.c | 26 ++++++++++++++++++--------
1 file changed, 18 insertions(+), 8 deletions(-)
diff -puN arch/nios2/mm/dma-mapping.c~arch-nios2-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap arch/nios2/mm/dma-mapping.c
--- a/arch/nios2/mm/dma-mapping.c~arch-nios2-add-option-to-skip-dma-sync-as-a-part-of-map-and-unmap
+++ a/arch/nios2/mm/dma-mapping.c
@@ -98,13 +98,17 @@ static int nios2_dma_map_sg(struct devic
int i;
for_each_sg(sg, sg, nents, i) {
- void *addr;
+ void *addr = sg_virt(sg);
- addr = sg_virt(sg);
- if (addr) {
- __dma_sync_for_device(addr, sg->length, direction);
- sg->dma_address = sg_phys(sg);
- }
+ if (!addr)
+ continue;
+
+ sg->dma_address = sg_phys(sg);
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
+ __dma_sync_for_device(addr, sg->length, direction);
}
return nents;
@@ -117,7 +121,9 @@ static dma_addr_t nios2_dma_map_page(str
{
void *addr = page_address(page) + offset;
- __dma_sync_for_device(addr, size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ __dma_sync_for_device(addr, size, direction);
+
return page_to_phys(page) + offset;
}
@@ -125,7 +131,8 @@ static void nios2_dma_unmap_page(struct
size_t size, enum dma_data_direction direction,
unsigned long attrs)
{
- __dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ __dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
}
static void nios2_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
@@ -138,6 +145,9 @@ static void nios2_dma_unmap_sg(struct de
if (direction == DMA_TO_DEVICE)
return;
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return;
+
for_each_sg(sg, sg, nhwentries, i) {
addr = sg_virt(sg);
if (addr)
_
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
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
