diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-06-06 10:47:33 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-06-27 09:31:40 +0300 |
| commit | 0cae04373b77a117830e5f7d7aaa7eaf01f950d5 (patch) | |
| tree | a894d5ebd6310633c04a11bec3ce0c64d3418fb2 /Documentation/driver-api | |
| parent | f7a03501b090f8c5f9ecb08420cda0b168667004 (diff) | |
| download | linux-0cae04373b77a117830e5f7d7aaa7eaf01f950d5.tar.xz | |
dmaengine: remove DMA_MEMCPY_SG once again
This was removed before due to the complete lack of users, but
3218910fd585 ("dmaengine: Add core function and capability check for
DMA_MEMCPY_SG") and 29cf37fa6dd9 ("dmaengine: Add consumer for the new
DMA_MEMCPY_SG API function.") added it back despite still not having
any users whatsoever.
Fixes: 3218910fd585 ("dmaengine: Add core function and capability check for DMA_MEMCPY_SG")
Fixes: 29cf37fa6dd9 ("dmaengine: Add consumer for the new DMA_MEMCPY_SG API function.")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20220606074733.622616-1-hch@lst.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/dmaengine/provider.rst | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst index 1e0f1f85d10e..ceac2a300e32 100644 --- a/Documentation/driver-api/dmaengine/provider.rst +++ b/Documentation/driver-api/dmaengine/provider.rst @@ -162,16 +162,6 @@ Currently, the types available are: - The device is able to do memory to memory copies -- - DMA_MEMCPY_SG - - - The device supports memory to memory scatter-gather transfers. - - - Even though a plain memcpy can look like a particular case of a - scatter-gather transfer, with a single chunk to copy, it's a distinct - transaction type in the mem2mem transfer case. This is because some very - simple devices might be able to do contiguous single-chunk memory copies, - but have no support for more complex SG transfers. - - No matter what the overall size of the combined chunks for source and destination is, only as many bytes as the smallest of the two will be transmitted. That means the number and size of the scatter-gather buffers in |