Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965191AbcJXS1u (ORCPT ); Mon, 24 Oct 2016 14:27:50 -0400 Received: from cassarossa.samfundet.no ([193.35.52.29]:40547 "EHLO cassarossa.samfundet.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932470AbcJXS1s (ORCPT ); Mon, 24 Oct 2016 14:27:48 -0400 Date: Mon, 24 Oct 2016 20:27:40 +0200 From: Hans-Christian Noren Egtvedt To: Alexander Duyck Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, brouer@redhat.com, Haavard Skinnemoen , davem@davemloft.net Subject: Re: [net-next PATCH RFC 05/26] arch/avr32: Add option to skip sync on DMA map Message-ID: <20161024182739.GA19445@samfundet.no> References: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> <20161024120452.16276.9594.stgit@ahduyck-blue-test.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161024120452.16276.9594.stgit@ahduyck-blue-test.jf.intel.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1497 Lines: 45 Around Mon 24 Oct 2016 08:04:53 -0400 or thereabout, Alexander Duyck wrote: > 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. Looks good (-: > Cc: Haavard Skinnemoen > Cc: Hans-Christian Egtvedt > Signed-off-by: Alexander Duyck Acked-by: Hans-Christian Noren Egtvedt > --- > arch/avr32/mm/dma-coherent.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c > index 58610d0..54534e5 100644 > --- a/arch/avr32/mm/dma-coherent.c > +++ b/arch/avr32/mm/dma-coherent.c > @@ -146,7 +146,8 @@ static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page, > { > void *cpu_addr = page_address(page) + offset; > > - dma_cache_sync(dev, cpu_addr, size, direction); > + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) > + dma_cache_sync(dev, cpu_addr, size, direction); > return virt_to_bus(cpu_addr); > } > > @@ -162,6 +163,10 @@ static int avr32_dma_map_sg(struct device *dev, struct scatterlist *sglist, > > sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset; > virt = sg_virt(sg); > + > + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) > + continue; > + > dma_cache_sync(dev, virt, sg->length, direction); > } > -- mvh Hans-Christian Noren Egtvedt