From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [mm PATCH v2 04/26] arch/arc: Add option to skip sync on DMA mapping Date: Wed, 02 Nov 2016 07:13:11 -0400 Message-ID: <20161102111308.79519.45058.stgit@ahduyck-blue-test.jf.intel.com> References: <20161102111031.79519.14741.stgit@ahduyck-blue-test.jf.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Vineet Gupta , linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: linux-mm@kvack.org, akpm@linux-foundation.org Return-path: In-Reply-To: <20161102111031.79519.14741.stgit@ahduyck-blue-test.jf.intel.com> Sender: owner-linux-mm@kvack.org List-Id: netdev.vger.kernel.org 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. Acked-by: Vineet Gupta Signed-off-by: Alexander Duyck --- 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 60aab5a..ea207d2 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); } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org