Re: [PATCH v13 00/56] Add DELETE_BUF ioctl

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

Le 31/10/2023 à 10:04, Hans Verkuil a écrit :
> Hi Benjamin,
>
> 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
>>
> I'll just write the comments here since I never received patch 44 in my mailbox.
> The messages are sent too quickly and my provider just throws some away if that
> happens for a long series like this, very annoying. You can configure git to
> slow down sending emails, if you can look into that, then that would be great.
> It seems to happen whenever more than approx. 30-35 patches are sent off very
> quickly.

I have send the patches of the next version (v14) using git send-email yes option
for each patch rather all option. Tell me if it better.

>
> In any case, a v14 is needed: when testing with -virtme and the patched v4l2-compliance
> it fails the 32 bit test. You need to add max_num_buffers support to
> drivers/media/v4l2-core/v4l2-compat-ioctl32.c.

I haven't be able to test using v4l2-compliance-32 but I have add code for
it in v4l2-compat-ioctl32.c. It should work fine.

>
> And since a v14 is needed because of that it would be nice if you can also
> make two small changes to patch 44/56:
>
> The commit log still refers to V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS (the old
> name). And in v4l_print_create_buffers() you log the value as "max buffers",
> just make that "max num buffers" for consistency.

Done in v14

Regards,
Benjamin

>
> 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
>>
>