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Message-ID: <fe581705-7202-48e1-b38b-0743f779d0bc@xs4all.nl>
Date:   Wed, 25 Oct 2023 14:17:52 +0200
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Subject: Re: [PATCH v13 00/56] Add DELETE_BUF ioctl
Content-Language: en-US, nl
To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com,
        ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar,
        p.zabel@pengutronix.de, gregkh@linuxfoundation.org,
        nicolas.dufresne@collabora.com
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev,
        kernel@collabora.com
References: <20231019125222.21370-1-benjamin.gaignard@collabora.com>
From:   Hans Verkuil <hverkuil-cisco@xs4all.nl>
In-Reply-To: <20231019125222.21370-1-benjamin.gaignard@collabora.com>
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Precedence: bulk

On 19/10/2023 14:51, Benjamin Gaignard wrote:
> 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 20 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_v13
> 
> GStreamer branch to use DELETE_BUF ioctl and testing dynamic resolution
> change is here:
> https://gitlab.freedesktop.org/benjamin.gaignard1/gstreamer/-/commits/VP9_drc

A quick status update: I've asked others to review the v4l2/vb2 core patches
of 01-50. If nothing new crops up, then I plan to get patches 01-50 merged
early in the 6.8 cycle.

Before we can start on the remaining patches, we need to review drivers that
use min_buffers_needed and drivers where queue_setup checks if 'enough' buffers
are allocated.

We likely will need to make changes there before we can add DELETE_BUFS.

Regards,

	Hans

> 
> changes in version 13:
> - Fix typo and wording in commits messages.
> - Only apply V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS on createbufs ioctl
> - Fix queue setup test in test-drivers
> 
> changes in version 12:
> - Change flag name to V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS.
> - Rework some commits message.
> - Change vb2_queue_or_prepare_buf() prototype.
> - Rework patches where 'min_buffers_needed' was badly used.
> 
> changes in version 11:
> - Patches ordering:
>   1 to 3: clean up
>   3 to 42: use vb2_get_buffer() and vb2_get_num_buffers()
>   43 to 46: allow to use more than 32 buffers per queue
>   47 to 50: allow verisilicon driver to do VP9 dynamic resolution change
>             (which was the main purpose of this work)
>   51 to 56: prepare and introduce delete buffers feature.
> - Add a patch to rename 'off' to offset.
> - Add maintainers CC to drivers patches
> 
> changes in version 10:
> - Make BUFFER_INDEX_MASK definition more readable
> - Rebase on media_stage/master branch and add a patch for nuvoton
>   driver.
> - Fix issue on patch 13
> 
> changes in version 9:
> - BUFFER_INDEX_MASK now depends on PAGE_SHIFT value to match
>   architectures requirements.
> - Correctly initialize max_num_buffers in vb2_core_queue_init()
> - run 'test-media -kmemleak mc' on top of the series and on patches 1 to 47 without failures.
> - fix compilation issue in patch 50
> 
> 
> 
>  
> Benjamin Gaignard (56):
>   media: videobuf2: Rename offset parameter
>   media: videobuf2: Rework offset 'cookie' encoding pattern
>   media: videobuf2: Stop spamming kernel log with all queue counter
>   media: videobuf2: Use vb2_buffer instead of index
>   media: videobuf2: Access vb2_queue bufs array through helper functions
>   media: videobuf2: Remove duplicated index vs q->num_buffers check
>   media: videobuf2: Add helper to get queue number of buffers
>   media: videobuf2: Use vb2_get_num_buffers() helper
>   media: amphion: Use vb2_get_buffer() instead of directly access to
>     buffers array
>   media: amphion: Stop direct calls to queue num_buffers field
>   media: mediatek: jpeg: Use vb2_get_buffer() instead of directly access
>     to buffers array
>   media: mediatek: vdec: Remove useless loop
>   media: mediatek: vcodec: Stop direct calls to queue num_buffers field
>   media: sti: hva: Use vb2_get_buffer() instead of directly access to
>     buffers array
>   media: visl: Use vb2_get_buffer() instead of directly access to
>     buffers array
>   media: atomisp: Use vb2_get_buffer() instead of directly access to
>     buffers array
>   media: atomisp: Stop direct calls to queue num_buffers field
>   media: dvb-core: Use vb2_get_buffer() instead of directly access to
>     buffers array
>   media: dvb-core: Do not initialize twice queue num_buffer field
>   media: dvb-frontends: rtl2832: Stop direct calls to queue num_buffers
>     field
>   media: pci: dt3155: Remove useless check
>   media: pci: tw686x: Stop direct calls to queue num_buffers field
>   media: pci: cx18: Stop direct calls to queue num_buffers field
>   media: pci: netup_unidvb: Stop direct calls to queue num_buffers field
>   media: pci: tw68: Stop direct calls to queue num_buffers field
>   media: i2c: video-i2c: Stop direct calls to queue num_buffers field
>   media: coda: Stop direct calls to queue num_buffers field
>   media: nxp: Stop direct calls to queue num_buffers field
>   media: verisilicon: Stop direct calls to queue num_buffers field
>   media: test-drivers: Stop direct calls to queue num_buffers field
>   media: imx: Stop direct calls to queue num_buffers field
>   media: meson: vdec: Stop direct calls to queue num_buffers field
>   touchscreen: sur40: Stop direct calls to queue num_buffers field
>   sample: v4l: Stop direct calls to queue num_buffers field
>   media: cedrus: Stop direct calls to queue num_buffers field
>   media: nuvoton: Stop direct calls to queue num_buffers field
>   media: renesas: Stop direct calls to queue num_buffers field
>   media: ti: Stop direct calls to queue num_buffers field
>   media: usb: airspy: Stop direct calls to queue num_buffers field
>   media: usb: cx231xx: Stop direct calls to queue num_buffers field
>   media: usb: hackrf: Stop direct calls to queue num_buffers field
>   media: usb: usbtv: Stop direct calls to queue num_buffers field
>   media: videobuf2: Be more flexible on the number of queue stored
>     buffers
>   media: core: Report the maximum possible number of buffers for the
>     queue
>   media: test-drivers: vivid: Increase max supported buffers for capture
>     queues
>   media: test-drivers: vicodec: Increase max supported capture queue
>     buffers
>   media: verisilicon: Refactor postprocessor to store more buffers
>   media: verisilicon: Store chroma and motion vectors offset
>   media: verisilicon: g2: Use common helpers to compute chroma and mv
>     offsets
>   media: verisilicon: vp9: Allow to change resolution while streaming
>   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-create-bufs.rst          |   8 +-
>  .../media/v4l/vidioc-delete-bufs.rst          |  80 +++
>  .../media/v4l/vidioc-reqbufs.rst              |   2 +
>  drivers/input/touchscreen/sur40.c             |   5 +-
>  .../media/common/videobuf2/videobuf2-core.c   | 569 +++++++++++-------
>  .../media/common/videobuf2/videobuf2-v4l2.c   | 125 ++--
>  drivers/media/dvb-core/dvb_vb2.c              |  17 +-
>  drivers/media/dvb-frontends/rtl2832_sdr.c     |   5 +-
>  drivers/media/i2c/video-i2c.c                 |   5 +-
>  drivers/media/pci/cx18/cx18-streams.c         |   5 +-
>  drivers/media/pci/dt3155/dt3155.c             |   2 -
>  .../pci/netup_unidvb/netup_unidvb_core.c      |   5 +-
>  drivers/media/pci/tw68/tw68-video.c           |   4 +-
>  drivers/media/pci/tw686x/tw686x-video.c       |   5 +-
>  drivers/media/platform/amphion/vpu_dbg.c      |  30 +-
>  drivers/media/platform/amphion/vpu_v4l2.c     |   4 +-
>  .../media/platform/chips-media/coda-common.c  |   2 +-
>  .../platform/mediatek/jpeg/mtk_jpeg_core.c    |   7 +-
>  .../vcodec/decoder/vdec/vdec_vp9_req_lat_if.c |   9 +-
>  .../mediatek/vcodec/encoder/mtk_vcodec_enc.c  |   2 +-
>  drivers/media/platform/nuvoton/npcm-video.c   |   2 +-
>  drivers/media/platform/nxp/imx7-media-csi.c   |   7 +-
>  drivers/media/platform/renesas/rcar_drif.c    |   5 +-
>  drivers/media/platform/st/sti/hva/hva-v4l2.c  |   9 +-
>  .../media/platform/ti/am437x/am437x-vpfe.c    |   5 +-
>  drivers/media/platform/ti/cal/cal-video.c     |   5 +-
>  .../media/platform/ti/davinci/vpif_capture.c  |   5 +-
>  .../media/platform/ti/davinci/vpif_display.c  |   5 +-
>  drivers/media/platform/ti/omap/omap_vout.c    |   5 +-
>  drivers/media/platform/verisilicon/hantro.h   |   9 +-
>  .../media/platform/verisilicon/hantro_drv.c   |   5 +-
>  .../media/platform/verisilicon/hantro_g2.c    |  14 +
>  .../platform/verisilicon/hantro_g2_hevc_dec.c |  18 +-
>  .../platform/verisilicon/hantro_g2_vp9_dec.c  |  28 +-
>  .../media/platform/verisilicon/hantro_hw.h    |   7 +-
>  .../platform/verisilicon/hantro_postproc.c    |  93 ++-
>  .../media/platform/verisilicon/hantro_v4l2.c  |  27 +-
>  .../media/test-drivers/vicodec/vicodec-core.c |   3 +
>  drivers/media/test-drivers/vim2m.c            |   2 +
>  .../media/test-drivers/vimc/vimc-capture.c    |   2 +
>  drivers/media/test-drivers/visl/visl-dec.c    |  32 +-
>  drivers/media/test-drivers/visl/visl-video.c  |   2 +
>  drivers/media/test-drivers/vivid/vivid-core.c |  21 +
>  .../media/test-drivers/vivid/vivid-meta-cap.c |   3 -
>  .../media/test-drivers/vivid/vivid-meta-out.c |   5 +-
>  .../test-drivers/vivid/vivid-touch-cap.c      |   5 +-
>  .../media/test-drivers/vivid/vivid-vbi-cap.c  |   3 -
>  .../media/test-drivers/vivid/vivid-vbi-out.c  |   3 -
>  .../media/test-drivers/vivid/vivid-vid-cap.c  |   3 -
>  .../media/test-drivers/vivid/vivid-vid-out.c  |   5 +-
>  drivers/media/usb/airspy/airspy.c             |   5 +-
>  drivers/media/usb/cx231xx/cx231xx-417.c       |   5 +-
>  drivers/media/usb/cx231xx/cx231xx-video.c     |   5 +-
>  drivers/media/usb/hackrf/hackrf.c             |   5 +-
>  drivers/media/usb/usbtv/usbtv-video.c         |   5 +-
>  drivers/media/v4l2-core/v4l2-dev.c            |   1 +
>  drivers/media/v4l2-core/v4l2-ioctl.c          |  21 +-
>  drivers/media/v4l2-core/v4l2-mem2mem.c        |  20 +
>  .../staging/media/atomisp/pci/atomisp_ioctl.c |   4 +-
>  drivers/staging/media/imx/imx-media-capture.c |   7 +-
>  drivers/staging/media/meson/vdec/vdec.c       |  13 +-
>  .../staging/media/sunxi/cedrus/cedrus_h264.c  |   9 +-
>  .../staging/media/sunxi/cedrus/cedrus_h265.c  |   9 +-
>  include/media/v4l2-ioctl.h                    |   4 +
>  include/media/v4l2-mem2mem.h                  |  12 +
>  include/media/videobuf2-core.h                |  65 +-
>  include/media/videobuf2-v4l2.h                |  13 +
>  include/uapi/linux/videodev2.h                |  24 +-
>  samples/v4l/v4l2-pci-skeleton.c               |   5 +-
>  70 files changed, 990 insertions(+), 472 deletions(-)
>  create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst
>