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media: videobuf2: add V4L2_MEMORY_FLAG_NON_COHERENT flag

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By setting or clearing the V4L2_MEMORY_FLAG_NON_COHERENT flag
user-space should be able to hint vb2 that either non-coherent
(if supported) or coherent memory should be used for the buffer
allocation.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sergey Senozhatsky 2021-09-09 13:24:27 +02:00 • committed by Mauro Carvalho Chehab
parent cde513fd9b
commit 965c1e0bfe
3 changed files with 43 additions and 4 deletions
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2
include/uapi/linux/videodev2.h
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@ -962,6 +962,8 @@ struct v4l2_requestbuffers {
__u32 reserved[1];
};
#define V4L2_MEMORY_FLAG_NON_COHERENT (1 << 0)
/* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
#define V4L2_BUF_CAP_SUPPORTS_MMAP (1 << 0)
#define V4L2_BUF_CAP_SUPPORTS_USERPTR (1 << 1)