[PATCH v17 0/8] Add DELETE_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 DELETE_BUFS ioctl and remove
the 32 buffers limit per queue.

VP9 conformance tests using fluster give a score of 210/305.
The 23 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_v1

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 17:
- rebased on top of:
  https://patchwork.linuxtv.org/project/linux-media/patch/20240118121452.29151-1-benjamin.gaignard@xxxxxxxxxxxxx/
  https://patchwork.linuxtv.org/project/linux-media/patch/92975c06-d6e1-4ba6-8d03-b2ef0b199c21@xxxxxxxxx/
- rewrite min_reqbufs_allocation field documentation.
- rewrite vb2_core_create_bufs() first_index parameter documentation.
- rework bitmap allocation usage in __vb2_queue_alloc().
- remove useless i < q->max_num_buffers checks.
- rework DELETE_BUFS documentation.
- change split between patch 7 and patch 8
- v4l2_m2m_delete_bufs() is now a static function.

changes in version 16:
- The 50 patches related to add helpers for queue num_bufefrs have already been merged.
- 'min_queued_buffers' patch has been merged too.
- Add 'min_reqbufs_allocation' field in vb2_queue structure.
- Take care of 'min_queued_buffers' when deleting buffers
- Add more check about buffers range limit when deleting buffers.

changes in version 15:
- Check that PLANE_INDEX_BITS value match with VIDEO_MAX_PLANES.
- Add a check on vb->vb2_queue in vb2_queue_add_buffer()
- Fix the remarks done by Hans, Thomasz and Andrzej. Thanks for the time
  they spend (again) on the review.


Benjamin Gaignard (8):
  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 DELETE_BUFS ioctl
  media: v4l2: Add mem2mem helpers for DELETE_BUFS ioctl
  media: verisilicon: Support deleting buffers on capture queue

 .../userspace-api/media/v4l/user-func.rst     |   1 +
 .../media/v4l/vidioc-delete-bufs.rst          |  80 +++++++
 .../media/v4l/vidioc-reqbufs.rst              |   1 +
 .../media/common/videobuf2/videobuf2-core.c   | 222 ++++++++++++------
 .../media/common/videobuf2/videobuf2-v4l2.c   |  34 ++-
 .../media/platform/verisilicon/hantro_drv.c   |   1 +
 .../media/platform/verisilicon/hantro_v4l2.c  |   1 +
 .../media/test-drivers/vicodec/vicodec-core.c |   2 +
 drivers/media/test-drivers/vim2m.c            |   2 +
 .../media/test-drivers/vimc/vimc-capture.c    |   4 +-
 drivers/media/test-drivers/visl/visl-video.c  |   2 +
 drivers/media/test-drivers/vivid/vivid-core.c |  17 +-
 drivers/media/v4l2-core/v4l2-dev.c            |   1 +
 drivers/media/v4l2-core/v4l2-ioctl.c          |  20 ++
 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                |  50 +++-
 include/media/videobuf2-v4l2.h                |  13 +
 include/uapi/linux/videodev2.h                |  17 ++
 20 files changed, 402 insertions(+), 87 deletions(-)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst

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2.40.1