[PATCH v3 00/11] 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_BUF ioctl and remove
the 32 buffers limit per queue.

VP9 conformance tests using fluster give a score of 210/305.
The 25 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_v3

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 3:
- Use Xarray API to store allocated video buffers.
- No module parameter to limit the number of buffer per queue.
- Use Xarray inside Verisilicon driver to store postprocessor buffers
  and remove VB2_MAX_FRAME limit.
- Allow Versilicon driver to change of resolution while streaming
- Various fixes the Verisilicon VP9 code to improve fluster score.
 
changes in version 2:
- Use a dynamic array and not a list to keep trace of allocated buffers.
  Not use IDR interface because it is marked as deprecated in kernel
  documentation.
- Add a module parameter to limit the number of buffer per queue.
- Add DELETE_BUF ioctl and m2m helpers.

Benjamin Gaignard (11):
  media: videobuf2: Access vb2_queue bufs array through helper functions
  media: videobuf2: Use Xarray instead of static buffers array
  media: videobuf2: Remove VB2_MAX_FRAME limit on buffer storage
  media: videobuf2: Stop define VB2_MAX_FRAME as global
  media: verisilicon: Refactor postprocessor to store more buffers
  media: verisilicon: Store chroma and motion vectors offset
  media: verisilicon: vp9: Use destination buffer height to compute
    chroma offset
  media: verisilicon: postproc: Fix down scale test
  media: verisilicon: vp9: Allow to change resolution while streaming
  media: v4l2: Add DELETE_BUF ioctl
  media: v4l2: Add mem2mem helpers for DELETE_BUF ioctl

 .../userspace-api/media/v4l/user-func.rst     |   1 +
 .../media/v4l/vidioc-delete-buf.rst           |  51 ++++
 .../media/common/videobuf2/videobuf2-core.c   | 275 ++++++++++++++----
 .../media/common/videobuf2/videobuf2-v4l2.c   |  34 ++-
 drivers/media/platform/amphion/vdec.c         |   1 +
 drivers/media/platform/amphion/vpu_dbg.c      |  22 +-
 .../platform/mediatek/jpeg/mtk_jpeg_core.c    |   6 +-
 .../vcodec/vdec/vdec_vp9_req_lat_if.c         |   4 +-
 drivers/media/platform/qcom/venus/hfi.h       |   2 +
 drivers/media/platform/st/sti/hva/hva-v4l2.c  |   4 +
 drivers/media/platform/verisilicon/hantro.h   |   8 +-
 .../platform/verisilicon/hantro_g2_vp9_dec.c  |  10 +-
 .../media/platform/verisilicon/hantro_hw.h    |   4 +-
 .../platform/verisilicon/hantro_postproc.c    | 114 +++++---
 .../media/platform/verisilicon/hantro_v4l2.c  |  37 +--
 drivers/media/test-drivers/vim2m.c            |   1 +
 drivers/media/test-drivers/visl/visl-dec.c    |  28 +-
 drivers/media/v4l2-core/v4l2-dev.c            |   1 +
 drivers/media/v4l2-core/v4l2-ioctl.c          |  10 +
 drivers/media/v4l2-core/v4l2-mem2mem.c        |  20 ++
 .../staging/media/atomisp/pci/atomisp_ioctl.c |   2 +-
 drivers/staging/media/ipu3/ipu3-v4l2.c        |   2 +
 include/media/v4l2-ioctl.h                    |   4 +
 include/media/v4l2-mem2mem.h                  |  12 +
 include/media/videobuf2-core.h                |  16 +-
 include/media/videobuf2-v4l2.h                |  15 +-
 include/uapi/linux/videodev2.h                |   2 +
 27 files changed, 523 insertions(+), 163 deletions(-)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst

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2.39.2