From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [net-next PATCH RFC 08/26] arch/frv: Add option to skip sync on DMA map Date: Mon, 24 Oct 2016 08:05:08 -0400 Message-ID: <20161024120508.16276.75216.stgit@ahduyck-blue-test.jf.intel.com> References: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: davem@davemloft.net, brouer@redhat.com To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Return-path: In-Reply-To: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> Sender: owner-linux-mm@kvack.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. Signed-off-by: Alexander Duyck --- arch/frv/mb93090-mb00/pci-dma-nommu.c | 16 +++++++++++----- arch/frv/mb93090-mb00/pci-dma.c | 7 ++++++- 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c index 90f2e4c..ff606d1 100644 --- a/arch/frv/mb93090-mb00/pci-dma-nommu.c +++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c @@ -109,16 +109,19 @@ static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction, unsigned long attrs) { - int i; struct scatterlist *sg; + int i; + + WARN_ON(direction == DMA_NONE); + + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return nents; for_each_sg(sglist, sg, nents, i) { frv_cache_wback_inv(sg_dma_address(sg), sg_dma_address(sg) + sg_dma_len(sg)); } - BUG_ON(direction == DMA_NONE); - return nents; } @@ -126,8 +129,11 @@ static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - BUG_ON(direction == DMA_NONE); - flush_dcache_page(page); + WARN_ON(direction == DMA_NONE); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; } diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c index f585745..ee5dadf 100644 --- a/arch/frv/mb93090-mb00/pci-dma.c +++ b/arch/frv/mb93090-mb00/pci-dma.c @@ -52,6 +52,9 @@ static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, for_each_sg(sglist, sg, nents, i) { vaddr = kmap_atomic_primary(sg_page(sg)); + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + continue; + frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE); @@ -70,7 +73,9 @@ static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - flush_dcache_page(page); + if (!(attr & DMA_ATTR_SKIP_CPU_SYNC)) + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; } -- 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