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Date: Tue, 25 Oct 2016 11:37:09 -0400 From: Alexander Duyck <alexander.h.duyck@...el.com> To: netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: Vineet Gupta <vgupta@...opsys.com>, linux-snps-arc@...ts.infradead.org, davem@...emloft.net, brouer@...hat.com Subject: [net-next PATCH 04/27] arch/arc: Add option to skip sync on DMA mapping 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 <vgupta@...opsys.com> Cc: linux-snps-arc@...ts.infradead.org Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com> --- arch/arc/mm/dma.c | 5 ++++- 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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