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authorChristoph Hellwig <hch@lst.de>2020-06-29 16:03:56 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2020-06-30 16:44:03 +0300
commit3aa91625007807bfca4155df1867a5c924a08662 (patch)
tree200b5d80ea2b377dcdc560056f1fc247dc18024f /Documentation
parent2bdeb3ed547d8822b2566797afa6c2584abdb119 (diff)
downloadlinux-3aa91625007807bfca4155df1867a5c924a08662.tar.xz
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')
-rw-r--r--Documentation/core-api/dma-api.rst8
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);