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| author | Christoph Hellwig <hch@lst.de> | 2020-06-29 15:03:56 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-06-30 15:44:03 +0200 |
| commit | 3aa91625007807bfca4155df1867a5c924a08662 (patch) | |
| tree | 200b5d80ea2b377dcdc560056f1fc247dc18024f /Documentation/core-api/dma-api.rst | |
| parent | 2bdeb3ed547d8822b2566797afa6c2584abdb119 (diff) | |
| download | lwn-3aa91625007807bfca4155df1867a5c924a08662.tar.gz lwn-3aa91625007807bfca4155df1867a5c924a08662.zip | |
dma-mapping: Add a new dma_need_sync API
Add a new API to check if calls to dma_sync_single_for_{device,cpu} are
required for a given DMA streaming mapping.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200629130359.2690853-2-hch@lst.de
Diffstat (limited to 'Documentation/core-api/dma-api.rst')
| -rw-r--r-- | Documentation/core-api/dma-api.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index 2d8d2fed7317..f41620439ef3 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -206,6 +206,14 @@ others should not be larger than the returned value. :: + bool + dma_need_sync(struct device *dev, dma_addr_t dma_addr); + +Returns %true if dma_sync_single_for_{device,cpu} calls are required to +transfer memory ownership. Returns %false if those calls can be skipped. + +:: + unsigned long dma_get_merge_boundary(struct device *dev); |