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| author | Christoph Hellwig <hch@lst.de> | 2020-09-01 14:34:33 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-09-25 07:20:47 +0300 |
| commit | efa70f2fdc842e63a0a13223e0e83cedcc2117f1 (patch) | |
| tree | ef21550627a0a50be9edf10c53542f9c59a61896 /Documentation/core-api | |
| parent | 5a84292271402cffe0717bc58e2ad9a0c7977272 (diff) | |
| download | linux-efa70f2fdc842e63a0a13223e0e83cedcc2117f1.tar.xz | |
dma-mapping: add a new dma_alloc_pages API
This API is the equivalent of alloc_pages, except that the returned memory
is guaranteed to be DMA addressable by the passed in device. The
implementation will also be used to provide a more sensible replacement
for DMA_ATTR_NON_CONSISTENT flag.
Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages
as its backend.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> (MIPS part)
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/dma-attributes.rst | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/Documentation/core-api/dma-attributes.rst b/Documentation/core-api/dma-attributes.rst index 29dcbe8826e8..1887d92e8e92 100644 --- a/Documentation/core-api/dma-attributes.rst +++ b/Documentation/core-api/dma-attributes.rst @@ -25,14 +25,6 @@ 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. - DMA_ATTR_NO_KERNEL_MAPPING -------------------------- |