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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-10-15 16:03:51 +0200 |
|---|---|---|
| committer | Inki Dae <daeinki@gmail.com> | 2012-11-29 03:30:34 -0800 |
| commit | 4b9347dcbe3b426d19bda99b2061a2d1fe5a2dce (patch) | |
| tree | 0a83c280f8a7bffa01ab8c86a443001b7a80e048 /Documentation/DMA-attributes.txt | |
| parent | e7783ba3bf1c631278be6620875fbfa6b0eba905 (diff) | |
| download | lwn-4b9347dcbe3b426d19bda99b2061a2d1fe5a2dce.tar.gz lwn-4b9347dcbe3b426d19bda99b2061a2d1fe5a2dce.zip | |
common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute
This patch adds DMA_ATTR_FORCE_CONTIGUOUS attribute to the DMA-mapping
subsystem.
By default DMA-mapping subsystem is allowed to assemble the buffer
allocated by dma_alloc_attrs() function from individual pages if it can
be mapped as contiguous chunk into device dma address space. By
specifing this attribute the allocated buffer is forced to be contiguous
also in physical memory.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'Documentation/DMA-attributes.txt')
| -rw-r--r-- | Documentation/DMA-attributes.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt index f50309081ac7..e59480db9ee0 100644 --- a/Documentation/DMA-attributes.txt +++ b/Documentation/DMA-attributes.txt @@ -91,3 +91,12 @@ transferred to 'device' domain. This attribute can be also used for dma_unmap_{single,page,sg} functions family to force buffer to stay in device domain after releasing a mapping for it. Use this attribute with care! + +DMA_ATTR_FORCE_CONTIGUOUS +------------------------- + +By default DMA-mapping subsystem is allowed to assemble the buffer +allocated by dma_alloc_attrs() function from individual pages if it can +be mapped as contiguous chunk into device dma address space. By +specifing this attribute the allocated buffer is forced to be contiguous +also in physical memory. |