From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f71.google.com (mail-pa0-f71.google.com [209.85.220.71]) by kanga.kvack.org (Postfix) with ESMTP id 226E128025B for ; Thu, 10 Nov 2016 12:36:25 -0500 (EST) Received: by mail-pa0-f71.google.com with SMTP id fp5so62174758pac.6 for ; Thu, 10 Nov 2016 09:36:25 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTPS id w3si6003997pgb.4.2016.11.10.09.36.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Nov 2016 09:36:24 -0800 (PST) Subject: [mm PATCH v3 11/23] arch/mips: Add option to skip DMA sync as a part of map and unmap From: Alexander Duyck Date: Thu, 10 Nov 2016 06:35:13 -0500 Message-ID: <20161110113513.76501.32321.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161110113027.76501.63030.stgit@ahduyck-blue-test.jf.intel.com> References: <20161110113027.76501.63030.stgit@ahduyck-blue-test.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: linux-mips@linux-mips.org, Keguang Zhang , linux-kernel@vger.kernel.org, Ralf Baechle , 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 via a sync_for_cpu or sync_for_device call. Cc: Ralf Baechle Cc: Keguang Zhang Cc: linux-mips@linux-mips.org Signed-off-by: Alexander Duyck --- arch/mips/loongson64/common/dma-swiotlb.c | 2 +- arch/mips/mm/dma-default.c | 8 +++++--- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c index 1a80b6f..aab4fd6 100644 --- a/arch/mips/loongson64/common/dma-swiotlb.c +++ b/arch/mips/loongson64/common/dma-swiotlb.c @@ -61,7 +61,7 @@ static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { - int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, 0); + int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs); mb(); return r; diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index b2eadd6..dd998d7 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -293,7 +293,7 @@ static inline void __dma_sync(struct page *page, static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction, unsigned long attrs) { - if (cpu_needs_post_dma_flush(dev)) + if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(dma_addr_to_page(dev, dma_addr), dma_addr & ~PAGE_MASK, size, direction); plat_post_dma_flush(dev); @@ -307,7 +307,8 @@ static int mips_dma_map_sg(struct device *dev, struct scatterlist *sglist, struct scatterlist *sg; for_each_sg(sglist, sg, nents, i) { - if (!plat_device_is_coherent(dev)) + if (!plat_device_is_coherent(dev) && + !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(sg_page(sg), sg->offset, sg->length, direction); #ifdef CONFIG_NEED_SG_DMA_LENGTH @@ -324,7 +325,7 @@ static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - if (!plat_device_is_coherent(dev)) + if (!plat_device_is_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(page, offset, size, direction); return plat_map_dma_mem_page(dev, page) + offset; @@ -339,6 +340,7 @@ static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, for_each_sg(sglist, sg, nhwentries, i) { if (!plat_device_is_coherent(dev) && + !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && direction != DMA_TO_DEVICE) __dma_sync(sg_page(sg), sg->offset, sg->length, direction); -- 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