From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx130.postini.com [74.125.245.130]) by kanga.kvack.org (Postfix) with SMTP id 039BC6B00F6 for ; Tue, 27 Mar 2012 09:43:31 -0400 (EDT) Received: from euspt1 (mailout2.w1.samsung.com [210.118.77.12]) by mailout2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0M1J00LUHQ4FLJ@mailout2.w1.samsung.com> for linux-mm@kvack.org; Tue, 27 Mar 2012 14:43:28 +0100 (BST) 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 <0M1J008F3Q4CGS@spt1.w1.samsung.com> for linux-mm@kvack.org; Tue, 27 Mar 2012 14:43:25 +0100 (BST) Date: Tue, 27 Mar 2012 15:42:48 +0200 From: Marek Szyprowski Subject: [PATCHv2 14/14] common: DMA-mapping: add NON-CONSISTENT attribute In-reply-to: <1332855768-32583-1-git-send-email-m.szyprowski@samsung.com> Message-id: <1332855768-32583-15-git-send-email-m.szyprowski@samsung.com> MIME-version: 1.0 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT References: <1332855768-32583-1-git-send-email-m.szyprowski@samsung.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Benjamin Herrenschmidt , Thomas Gleixner , Andrew Morton , Arnd Bergmann , Stephen Rothwell , FUJITA Tomonori , microblaze-uclinux@itee.uq.edu.au, linux-arch@vger.kernel.org, x86@kernel.org, linux-sh@vger.kernel.org, linux-alpha@vger.kernel.org, sparclinux@vger.kernel.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mips@linux-mips.org, discuss@x86-64.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linaro-mm-sig@lists.linaro.org, Jonathan Corbet , Marek Szyprowski , Kyungmin Park , Andrzej Pietrasiewicz , Kevin Cernekee , Dezhong Diao , Richard Kuo , "David S. Miller" , Michal Simek , Guan Xuetao , Paul Mundt , Richard Henderson , Ivan Kokshaysky , Matt Turner , Tony Luck , Fenghua Yu 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 Acked-by: Kyungmin Park Reviewed-by: Arnd Bergmann --- 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 -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org