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common: DMA-mapping: add NON-CONSISTENT attribute

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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 <m.szyprowski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Marek Szyprowski 2012-03-28 07:55:56 +02:00
parent 8a4134322b
commit 64d70fe5d3
2 changed files with 9 additions and 0 deletions
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8
Documentation/DMA-attributes.txt
View file

@ -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.

1
include/linux/dma-attrs.h
View file

@ -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,
};