[PATCH v21 0/9] Add REMOVE_BUF ioctl

[Benjamin Gaignard]

Unlike when resolution change on keyframes, dynamic resolution change
on inter frames doesn't allow to do a stream off/on sequence because
it is need to keep all previous references alive to decode inter frames.
This constraint have two main problems:
- more memory consumption.
- more buffers in use.
To solve these issue this series introduce REMOVE_BUFS ioctl.

VP9 conformance tests using fluster give a score of 210/305.
The 24 of the 24 resize inter tests (vp90-2-21-resize_inter_* files) are ok
but require to use postprocessor.

Kernel branch is available here:
https://gitlab.collabora.com/benjamin.gaignard/for-upstream/-/commits/remove_vb2_queue_limit_v21

GStreamer branch to use DELETE_BUF ioctl and testing dynamic resolution
change is here:
https://gitlab.freedesktop.org/benjamin.gaignard1/gstreamer/-/commits/VP9_drc

changes in version 21:
- Be more careful about checking remove_bufs type field vs queue type.
- Add documentation about type checking error.
- Always set capabilities flags field.
- Do not set vidioc_remove_bufs for vim2m driver.

changes in version 20:
- Rename DELETE_BUFS into REMOVE_BUFS
- Change documention, structure and variables name to use 'remove'

changes in version 19:
- Fix typo in commit message.
- Fix ioctl domentation
- Rework q->is_busy patch following Hans's comments
- Change where DELETE_BUFS is enabled

Benjamin Gaignard (9):
  media: videobuf2: Update vb2_is_busy() logic
  videobuf2: Add min_reqbufs_allocation field to vb2_queue structure
  media: test-drivers: Set REQBUFS minimum number of buffers
  media: core: Rework how create_buf index returned value is computed
  media: core: Add bitmap manage bufs array entries
  media: core: Free range of buffers
  media: v4l2: Add REMOVE_BUFS ioctl
  media: v4l2: Add mem2mem helpers for REMOVE_BUFS ioctl
  media: verisilicon: Support removing buffers on capture queue

 .../userspace-api/media/v4l/user-func.rst     |   1 +
 .../media/v4l/vidioc-remove-bufs.rst          |  85 +++++++
 .../media/v4l/vidioc-reqbufs.rst              |   1 +
 .../media/common/videobuf2/videobuf2-core.c   | 223 ++++++++++++------
 .../media/common/videobuf2/videobuf2-v4l2.c   |  34 ++-
 .../media/platform/verisilicon/hantro_v4l2.c  |   1 +
 .../media/test-drivers/vicodec/vicodec-core.c |   1 +
 .../media/test-drivers/vimc/vimc-capture.c    |   3 +-
 drivers/media/test-drivers/visl/visl-video.c  |   1 +
 drivers/media/test-drivers/vivid/vivid-core.c |   5 +-
 drivers/media/v4l2-core/v4l2-dev.c            |   3 +
 drivers/media/v4l2-core/v4l2-ioctl.c          |  30 +++
 drivers/media/v4l2-core/v4l2-mem2mem.c        |  15 ++
 include/media/v4l2-ioctl.h                    |   4 +
 include/media/v4l2-mem2mem.h                  |   2 +
 include/media/videobuf2-core.h                |  52 +++-
 include/media/videobuf2-v4l2.h                |   2 +
 include/uapi/linux/videodev2.h                |  17 ++
 18 files changed, 394 insertions(+), 86 deletions(-)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-remove-bufs.rst

-- 
2.40.1