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media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag

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This patch lets user-space to request a non-consistent memory
allocation during CREATE_BUFS and REQBUFS ioctl calls.

= CREATE_BUFS

  struct v4l2_create_buffers has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= CREATE_BUFS32

  struct v4l2_create_buffers32 has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= REQBUFS

 We use one bit of a ->reserved[1] member of struct v4l2_requestbuffers,
 which is now renamed to ->flags. Unlike v4l2_create_buffers, struct
 v4l2_requestbuffers does not have enough reserved room. Therefore for
 backward compatibility  ->reserved and ->flags were put into anonymous
 union.

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
2020-05-14 18:01:45 +02:00
committed by Mauro Carvalho Chehab
parent 7b4b45555c
commit 1e0b2318fa
7 changed files with 59 additions and 15 deletions
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11
include/uapi/linux/videodev2.h
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@@ -946,7 +946,10 @@ struct v4l2_requestbuffers {
__u32 type; /* enum v4l2_buf_type */
__u32 memory; /* enum v4l2_memory */
__u32 capabilities;
__u32 reserved[1];
union {
__u32 flags;
__u32 reserved[1];
};
};
/* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
@@ -2450,6 +2453,9 @@ struct v4l2_dbg_chip_info {
* @memory: enum v4l2_memory; buffer memory type
* @format: frame format, for which buffers are requested
* @capabilities: capabilities of this buffer type.
* @flags: additional buffer management attributes (ignored unless the
* queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
* and configured for MMAP streaming I/O).
* @reserved: future extensions
*/
struct v4l2_create_buffers {
@@ -2458,7 +2464,8 @@ struct v4l2_create_buffers {
__u32 memory;
struct v4l2_format format;
__u32 capabilities;
__u32 reserved[7];
__u32 flags;
__u32 reserved[6];
};
/*