[PATCH v2 0/8] Add DELETE_BUF ioctl

[Benjamin Gaignard <benjamin.gaignard@collabora.com>]

VP9 dynamic resolution change use case requires to change resolution
without doing stream off/on to keep references frames.
In consequence the numbers of buffers increase until all 'old'
reference frames are deprecated.
To make it possible this series remove the 32 buffers limit per queue
and introduce DELETE_BUF ioctl to delete buffers from a queue without
doing stream off/on sequence.

change 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 (8):
  media: videobuf2: Access vb2_queue bufs array through helper functions
  media: videobuf2: Make bufs array dynamic allocated
  media: videobuf2: Add a module param to limit vb2 queue buffer storage
  media: videobuf2: Stop define VB2_MAX_FRAME as global
  media: v4l2: Add DELETE_BUF ioctl
  media: v4l2: Add mem2mem helpers for DELETE_BUF ioctl
  media: vim2m: Use v4l2-mem2mem helpers for VIDIOC_DELETE_BUF ioctl
  media: verisilicon: Use v4l2-mem2mem helpers for VIDIOC_DELETE_BUF
    ioctl

 .../userspace-api/media/v4l/user-func.rst     |   1 +
 .../media/v4l/vidioc-delete-buf.rst           |  51 ++++++
 .../media/common/videobuf2/videobuf2-core.c   | 168 +++++++++++++-----
 .../media/common/videobuf2/videobuf2-v4l2.c   |  23 ++-
 drivers/media/platform/amphion/vdec.c         |   1 +
 drivers/media/platform/amphion/vpu_dbg.c      |   4 +-
 .../platform/mediatek/jpeg/mtk_jpeg_core.c    |   2 +-
 .../vcodec/vdec/vdec_vp9_req_lat_if.c         |   4 +-
 drivers/media/platform/qcom/venus/hfi.h       |   2 +
 .../media/platform/verisilicon/hantro_hw.h    |   2 +
 .../media/platform/verisilicon/hantro_v4l2.c  |   1 +
 drivers/media/test-drivers/vim2m.c            |   1 +
 drivers/media/test-drivers/visl/visl-dec.c    |  16 +-
 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                |  84 ++++++++-
 include/media/videobuf2-v4l2.h                |  15 +-
 include/uapi/linux/videodev2.h                |   1 +
 23 files changed, 353 insertions(+), 74 deletions(-)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst

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2.34.1