From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailout3.w1.samsung.com (mailout3.w1.samsung.com [210.118.77.13]) by ozlabs.org (Postfix) with ESMTP id 4C8E9B71C6 for ; Fri, 23 Dec 2011 23:38:14 +1100 (EST) MIME-version: 1.0 Content-type: TEXT/PLAIN Received: from euspt1 ([210.118.77.13]) by mailout3.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LWN006J9PAN9O40@mailout3.w1.samsung.com> for linuxppc-dev@lists.ozlabs.org; Fri, 23 Dec 2011 12:28:00 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LWN008ECPANPZ@spt1.w1.samsung.com> for linuxppc-dev@lists.ozlabs.org; Fri, 23 Dec 2011 12:27:59 +0000 (GMT) Date: Fri, 23 Dec 2011 13:27:33 +0100 From: Marek Szyprowski Subject: [PATCH 14/14] common: DMA-mapping: add NON-CONSISTENT attribute In-reply-to: <1324643253-3024-1-git-send-email-m.szyprowski@samsung.com> To: linux-kernel@vger.kernel.org Message-id: <1324643253-3024-15-git-send-email-m.szyprowski@samsung.com> References: <1324643253-3024-1-git-send-email-m.szyprowski@samsung.com> Cc: linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Marek Szyprowski , linux-arch@vger.kernel.org, Stephen Rothwell , Jonathan Corbet , x86@kernel.org, Arnd Bergmann , microblaze-uclinux@itee.uq.edu.au, linaro-mm-sig@lists.linaro.org, Andrzej Pietrasiewicz , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, discuss@x86-64.org, Kyungmin Park , linux-alpha@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , DMA_ATTR_NON_CONSISTENT lets the platform to choose to return either consistent or non-consistent memory as it sees fit. By using this API, you are guaranteeing to the platform that you have all the correct and necessary sync points for this memory in the driver should it choose to return non-consistent memory. Signed-off-by: Marek Szyprowski Signed-off-by: Kyungmin Park --- Documentation/DMA-attributes.txt | 9 +++++++++ include/linux/dma-attrs.h | 1 + 2 files changed, 10 insertions(+), 0 deletions(-) diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt index 811a5d4..9120de2 100644 --- a/Documentation/DMA-attributes.txt +++ b/Documentation/DMA-attributes.txt @@ -41,3 +41,12 @@ buffered to improve performance. Since it is optional for platforms to implement DMA_ATTR_WRITE_COMBINE, those that do not will simply ignore the attribute and exhibit default behavior. + +DMA_ATTR_NON_CONSISTENT +----------------------- + +DMA_ATTR_NON_CONSISTENT lets the platform to choose to return either +consistent or non-consistent memory as it sees fit. By using this API, +you are guaranteeing to the platform that you have all the correct and +necessary sync points for this memory in the driver should it choose to +return non-consistent memory. diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h index ada61e1..547ab56 100644 --- a/include/linux/dma-attrs.h +++ b/include/linux/dma-attrs.h @@ -14,6 +14,7 @@ enum dma_attr { DMA_ATTR_WRITE_BARRIER, DMA_ATTR_WEAK_ORDERING, DMA_ATTR_WRITE_COMBINE, + DMA_ATTR_NON_CONSISTENT, DMA_ATTR_MAX, }; -- 1.7.1.569.g6f426