Re: [net-next PATCH 04/27] arch/arc: Add option to skip sync on DMA mapping
From: Vineet Gupta <hidden>
Date: 2016-10-25 22:01:06
Also in:
intel-wired-lan, linux-mm, lkml
On 10/25/2016 02:38 PM, Alexander Duyck wrote:
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. Cc: Vineet Gupta <redacted> Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Alexander Duyck <redacted> --- arch/arc/mm/dma.c | 5 ++++-
Acked-by: Vineet Gupta <redacted>
quoted hunk ↗ jump to hunk
1 file changed, 4 insertions(+), 1 deletion(-)diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 20afc65..6303c34 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c@@ -133,7 +133,10 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, unsigned long attrs) { phys_addr_t paddr = page_to_phys(page) + offset; - _dma_cache_sync(paddr, size, dir); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + _dma_cache_sync(paddr, size, dir); + return plat_phys_to_dma(dev, paddr); }
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