From: Marek Szyprowski Date: Wed, 28 Mar 2012 05:55:56 +0000 (+0200) Subject: common: DMA-mapping: add NON-CONSISTENT attribute X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=64d70fe5d3640e1a89790ed21120921278f8cb86;p=linux-edison.git common: DMA-mapping: add NON-CONSISTENT attribute 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. Signed-off-by: Marek Szyprowski Acked-by: Kyungmin Park Reviewed-by: Arnd Bergmann --- diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt index 811a5d458da..5c72eed8956 100644 --- a/Documentation/DMA-attributes.txt +++ b/Documentation/DMA-attributes.txt @@ -41,3 +41,11 @@ 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. diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h index ada61e1abf2..547ab568d3a 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, };