From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [mm PATCH v2 07/26] arch/blackfin: Add option to skip sync on DMA map Date: Wed, 02 Nov 2016 07:13:37 -0400 Message-ID: <20161102111334.79519.36391.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: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Steven Miao 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: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the DMA APIs in the arch/arm folder. This change is meant to correct that so that we get consistent behavior. Cc: Steven Miao Signed-off-by: Alexander Duyck --- arch/blackfin/kernel/dma-mapping.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c index 53fbbb6..a27a74a 100644 --- a/arch/blackfin/kernel/dma-mapping.c +++ b/arch/blackfin/kernel/dma-mapping.c @@ -118,6 +118,10 @@ static int bfin_dma_map_sg(struct device *dev, struct scatterlist *sg_list, for_each_sg(sg_list, sg, nents, i) { sg->dma_address = (dma_addr_t) sg_virt(sg); + + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + continue; + __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction); } @@ -143,7 +147,9 @@ static dma_addr_t bfin_dma_map_page(struct device *dev, struct page *page, { dma_addr_t handle = (dma_addr_t)(page_address(page) + offset); - _dma_sync(handle, size, dir); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + _dma_sync(handle, size, dir); + return handle; }