linux-kernel - Re: [PATCH v16 0/8] Add DELETE

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Message-ID: <5f85456c-4ee4-4ea2-be74-f35e6ac95a09@collabora.com>
Date: Tue, 9 Jan 2024 10:37:00 +0100
From: Benjamin Gaignard <benjamin.gaignard@...labora.com>
To: hverkuil@...all.nl, mchehab@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 kernel@...labora.com
Subject: Re: [PATCH v16 0/8] Add DELETE_BUF ioctl


Le 15/12/2023 à 10:08, Benjamin Gaignard a écrit :
> 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_v16
>
> 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 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.

A little ping after the holidays about this series.

Thanks,
Benjamin

>
> 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.
>
> changes in version 14:
> - Add max_num_buffers fields in v4l2_create_buffers32 structure and copy
>    it from/to user data.
> - Fix patch 44 commit header.
> - Fix v4l_print_create_buffers() log.
>
> 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: test-drivers: Use helper for DELETE_BUFS ioctl
>
>   .../userspace-api/media/v4l/user-func.rst     |   1 +
>   .../media/v4l/vidioc-delete-bufs.rst          |  79 ++++++++
>   .../media/v4l/vidioc-reqbufs.rst              |   1 +
>   .../media/common/videobuf2/videobuf2-core.c   | 171 +++++++++++++-----
>   .../media/common/videobuf2/videobuf2-v4l2.c   |  40 +++-
>   .../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          |  19 ++
>   drivers/media/v4l2-core/v4l2-mem2mem.c        |  20 ++
>   include/media/v4l2-ioctl.h                    |   4 +
>   include/media/v4l2-mem2mem.h                  |  12 ++
>   include/media/videobuf2-core.h                |  47 ++++-
>   include/media/videobuf2-v4l2.h                |  13 ++
>   include/uapi/linux/videodev2.h                |  17 ++
>   20 files changed, 386 insertions(+), 68 deletions(-)
>   create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst
>