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Groups > linux.kernel > #1507554
| From | Alexander Duyck <alexander.h.duyck@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [net-next PATCH RFC 15/26] arch/openrisc: Add option to skip DMA sync as a part of mapping |
| Date | 2016-10-24 20:20 +0200 |
| Message-ID | <svS0O-2QU-37@gated-at.bofh.it> (permalink) |
| References | <svRR7-2Kt-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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.
Cc: Jonas Bonn <jonas@southpole.se>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
arch/openrisc/kernel/dma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index 140c991..906998b 100644
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c
@@ -141,6 +141,9 @@
unsigned long cl;
dma_addr_t addr = page_to_phys(page) + offset;
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ return addr;
+
switch (dir) {
case DMA_TO_DEVICE:
/* Flush the dcache for the requested range */
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[net-next PATCH RFC 00/26] Add support for DMA writable pages being writable by the network stack Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 [net-next PATCH RFC 26/26] igb: Revert "igb: Revert support for build_skb in igb" Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 [net-next PATCH RFC 07/26] arch/c6x: Add option to skip sync on DMA map and unmap Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 [net-next PATCH RFC 10/26] arch/m68k: Add option to skip DMA sync as a part of mapping Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 [net-next PATCH RFC 13/26] arch/mips: Add option to skip DMA sync as a part of map and unmap Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 [net-next PATCH RFC 12/26] arch/microblaze: Add option to skip DMA sync as a part of map and unmap Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:10 +0200 Re: [net-next PATCH RFC 01/26] swiotlb: Drop unused function swiotlb_map_sg Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 02/26] swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 01/26] swiotlb: Drop unused function swiotlb_map_sg Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 09/26] arch/hexagon: Add option to skip DMA sync as a part of mapping Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 08/26] arch/frv: Add option to skip sync on DMA map Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 15/26] arch/openrisc: Add option to skip DMA sync as a part of mapping Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200 [net-next PATCH RFC 03/26] arch/arc: Add option to skip sync on DMA mapping Alexander Duyck <alexander.h.duyck@intel.com> - 2016-10-24 20:20 +0200
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