Re: [PATCH v8 00/53] Add DELETE_BUF ioctl

Benjamin Gaignard
2023-09-28T13:17:20Z

Le 28/09/2023 à 15:04, Hans Verkuil a écrit :
> Hi Benjamin,
>
> On 27/09/2023 17:35, 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 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_v8
>>
>> 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 applied patches 1-46 on top of staging and applied patch 1/2 of v4l-utils. I chose
> 1-46 since those would be the first batch to be merged.
>
> I had to apply a small patch on top, since amphion was still using max_allowed_buffers:
>
> https://git.linuxtv.org/hverkuil/media_tree.git/commit/?h=delbuf&id=fce79aa0239a3a4e5c7634b9b7ffc356057b70b4
>
> With that change everything compiled cleanly.
>
> But running the regression tests (test-media script) failed with a kernel oops:
>
> Buffer ioctls (Input 0):
> fail: v4l2-test-buffers.cpp(611): q.reqbufs(node, 1)
> test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL
> [ 25.309343] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> [ 25.310067] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
> [ 25.310471] CPU: 0 PID: 187 Comm: v4l2-compliance Not tainted 6.6.0-rc3+ #1
> [ 25.310837] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> [ 25.311334] RIP: 0010:__vb2_queue_alloc+0x34c/0xd00 [videobuf2_common]
> [ 25.311688] Code: 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 0c 07 00 00 49 8b b7 40 01 00 00 44 89 f0 4c 8d 2c c6 41 39 ce 73 18 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 d2 08 00 00 49 83 7d 00 00 74 02
> 0f 0b 4c 89 e8
> [ 25.312670] RSP: 0018:ffff88810afef930 EFLAGS: 00010212
> [ 25.312948] RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000040
> [ 25.313331] RDX: ffff88810ce08814 RSI: 0000000000000000 RDI: ffff88810cfb72e0
> [ 25.313708] RBP: ffff88810ce08800 R08: 0000000000001800 R09: 0000000000000001
> [ 25.314097] R10: ffffffff91560b0f R11: ffffffff8f40006a R12: ffff88810afefa74
> [ 25.314470] R13: 0000000000000008 R14: 0000000000000001 R15: ffff88810cfb71a0
> [ 25.314854] FS: 00007fa524908440(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000
> [ 25.315281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 25.315594] CR2: 0000562855948270 CR3: 0000000109e21000 CR4: 0000000000350ef0
> [ 25.315982] Call Trace:
> [ 25.316122] <TASK>
> [ 25.316243] ? die_addr+0x37/0xa0
> [ 25.316433] ? exc_general_protection+0x144/0x210
> [ 25.316693] ? asm_exc_general_protection+0x22/0x30
> [ 25.316955] ? entry_SYSCALL_64_after_hwframe+0x46/0xb0
> [ 25.317235] ? __vb2_queue_alloc+0x34c/0xd00 [videobuf2_common]
> [ 25.317555] vb2_core_create_bufs+0x5a0/0xce0 [videobuf2_common]
> [ 25.317879] ? __vb2_queue_alloc+0xd00/0xd00 [videobuf2_common]
> [ 25.318213] vb2_create_bufs+0x680/0x7f0 [videobuf2_v4l2]
> [ 25.318506] ? __kasan_kmalloc+0x83/0x90
> [ 25.318729] ? __kmalloc+0x5c/0x150
> [ 25.318924] ? __video_do_ioctl+0x3a5/0xc20 [videodev]
> [ 25.319223] ? __copy_timestamp+0x270/0x270 [videobuf2_v4l2]
> [ 25.319532] ? v4l_sanitize_format+0x121/0x340 [videodev]
> [ 25.319839] vb2_ioctl_create_bufs+0x280/0x440 [videobuf2_v4l2]
> [ 25.320162] ? check_fmt+0x15/0x5e0 [videodev]
> [ 25.320420] v4l_create_bufs+0xa8/0x150 [videodev]
> [ 25.320693] __video_do_ioctl+0x8d0/0xc20 [videodev]
> [ 25.320975] ? v4l_prepare_buf+0xa0/0xa0 [videodev]
> [ 25.321250] ? __might_fault+0x112/0x170
> [ 25.321463] ? __might_fault+0x112/0x170
> [ 25.321675] video_usercopy+0x48c/0xd00 [videodev]
> [ 25.321949] ? v4l_prepare_buf+0xa0/0xa0 [videodev]
> [ 25.322228] ? v4l_enumstd+0x60/0x60 [videodev]
> [ 25.322497] ? selinux_bprm_creds_for_exec+0xa90/0xa90
> [ 25.322779] ? rseq_ip_fixup+0x304/0x480
> [ 25.322995] ? __up_read+0x10b/0x750
> [ 25.323201] ? rseq_get_rseq_cs+0x680/0x680
> [ 25.323430] v4l2_ioctl+0x17f/0x1f0 [videodev]
> [ 25.323689] __x64_sys_ioctl+0x127/0x190
> [ 25.323905] do_syscall_64+0x35/0x80
> [ 25.324105] entry_SYSCALL_64_after_hwframe+0x46/0xb0
> [ 25.324372] RIP: 0033:0x7fa524bf44eb
> [ 25.324564] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b
> 04 25 28 00 00
> [ 25.325533] RSP: 002b:00007ffc888efee0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [ 25.325933] RAX: ffffffffffffffda RBX: 00007ffc888f0350 RCX: 00007fa524bf44eb
> [ 25.326314] RDX: 00007ffc888effb0 RSI: 00000000c100565c RDI: 0000000000000023
> [ 25.326702] RBP: 00007ffc888f8550 R08: 0000000000000000 R09: 0000000000000001
> [ 25.327081] R10: 0000000000000016 R11: 0000000000000246 R12: 0000000000000000
> [ 25.327468] R13: 0000000000000001 R14: 00007ffc888f8010 R15: 00007ffc888f1790
> [ 25.327852] </TASK>
> [ 25.327979] Modules linked in: vivid videobuf2_dma_contig v4l2_tpg v4l2_dv_timings cec videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videodev videobuf2_common mc rc_core
> [ 25.328835] ---[ end trace 0000000000000000 ]---
> [ 25.329083] RIP: 0010:__vb2_queue_alloc+0x34c/0xd00 [videobuf2_common]
> [ 25.329434] Code: 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 0c 07 00 00 49 8b b7 40 01 00 00 44 89 f0 4c 8d 2c c6 41 39 ce 73 18 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 d2 08 00 00 49 83 7d 00 00 74 02
> 0f 0b 4c 89 e8
> [ 25.330417] RSP: 0018:ffff88810afef930 EFLAGS: 00010212
> [ 25.330812] RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000040
> [ 25.331194] RDX: ffff88810ce08814 RSI: 0000000000000000 RDI: ffff88810cfb72e0
> [ 25.331594] RBP: ffff88810ce08800 R08: 0000000000001800 R09: 0000000000000001
> [ 25.331978] R10: ffffffff91560b0f R11: ffffffff8f40006a R12: ffff88810afefa74
> [ 25.332360] R13: 0000000000000008 R14: 0000000000000001 R15: ffff88810cfb71a0
> [ 25.332746] FS: 00007fa524908440(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000
> [ 25.333170] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 25.333486] CR2: 0000562855948270 CR3: 0000000109e21000 CR4: 0000000000350ef0
> [ 25.333861] Kernel panic - not syncing: Fatal exception
> [ 25.334179] Kernel Offset: 0xbe00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> [ 25.334748] Rebooting in 30 seconds..
>
> I use the build scripts as described here:
>
> https://lore.kernel.org/linux-media/18989016-6392-a77b-6cf7-1223c9161def@xs4all.nl/
>
> I use this command to run the regression tests:
>
> ./build.sh -virtme -virtme-utils-path /usr/local/bin none delbuf
>
> (delbuf is the name of my branch)
>
> I don't really want to spend time reviewing this series until this is fixed...

Yes that make sense.
It will work on it and let you now when I had fix it.
Regards,
Benjamin

>
> Regards,
>
> Hans
>
>> changes in version 8:
>> - Add V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS and new 'max_buffers' field in v4l2_create_buffers
>> structure to report the maximum number of buffers that a queue could allocate.
>> - Add V4L2_BUF_CAP_SUPPORTS_DELETE_BUFS to indicate that a queue support
>> DELETE_BUFS ioctl.
>> - Make some test drivers use more than 32 buffers and DELETE_BUFS ioctl.
>> - Fix remarks done by Hans
>> - Move "media: core: Rework how create_buf index returned value is
>> computed" patch to the top of the serie.
>>
>> changes in version 7:
>> - Use a bitmap to know which entries are valid in queue bufs array.
>> The number of buffers in the queue could must calculated from the
>> bitmap so num_buffers becomes useless. This led to add quite few
>> patches to remove it from all the drivers.
>> Note: despiste my attention I may have miss some calls to
>> num_buffers...
>> - Split patches to make them more readable.
>> - Run v4l2-compliance with additional delete-bufs tests.
>> - Run ./test-media -kmemleak vivid and no more failures.
>> Note: I had to remove USERPTR streaming test because they to much
>> frequentely hit get_framevec bug. It is not related to my series
>> since this happens all the time on master branch.
>> - Fix Hans remarks on v6
>>
>> changes in version 6:
>> - Get a patch per driver to use vb2_get_buffer() instead of directly access
>> to queue buffers array.
>> - Add lock in vb2_core_delete_buf()
>> - Use vb2_buffer instead of index
>> - Fix various comments
>> - Change buffer index name to BUFFER_INDEX_MASK
>> - Stop spamming kernel log with unbalanced counters
>>
>> changes in version 5:
>> - Rework offset cookie encoding pattern is n ow the first patch of the
>> serie.
>> - Use static array instead of allocated one for postprocessor buffers.
>>
>> changes in version 4:
>> - Stop using Xarray, instead let queues decide about their own maximum
>> number of buffer and allocate bufs array given that value.
>> - Rework offset cookie encoding pattern.
>> - Change DELETE_BUF to DELETE_BUFS because it now usable for
>> range of buffer to be symetrical of CREATE_BUFS.
>> - Add fixes tags on couple of Verisilicon related patches.
>> - Be smarter in Verisilicon postprocessor buffers management.
>> - Rebase on top of v6.4
>>
>> 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.
>>
>> Regards,
>> Benjamin
>>
>> Benjamin Gaignard (53):
>> 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: amphion: Use vb2_get_buffer() instead of directly access to
>> buffers array
>> media: mediatek: jpeg: Use vb2_get_buffer() instead of directly access
>> to buffers array
>> media: mediatek: vdec: Remove useless loop
>> 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: dvb-core: Use vb2_get_buffer() instead of directly access to
>> buffers array
>> media: videobuf2: Access vb2_queue bufs array through helper functions
>> media: videobuf2: Be more flexible on the number of queue stored
>> buffers
>> media: 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: Remove duplicated index vs q->num_buffers check
>> media: core: Add helper to get queue number of buffers
>> media: dvb-core: Do not initialize twice queue num_buffer field
>> media: dvb-frontends: rtl2832_srd: Use queue min_buffers_needed field
>> media: video-i2c: Set min_buffers_needed to 2
>> media: pci: cx18: Set correct value to min_buffers_needed field
>> media: pci: dt3155: Remove useless check
>> media: pci: netup_unidvb: Remove useless number of buffers check
>> media: pci: tw68: Stop direct calls to queue num_buffers field
>> media: pci: tw686x: Set min_buffers_needed to 3
>> media: amphion: Stop direct calls to queue num_buffers field
>> media: coda: Stop direct calls to queue num_buffers field
>> media: mediatek: vcodec: Stop direct calls to queue num_buffers field
>> media: nxp: Stop direct calls to queue num_buffers field
>> media: renesas: Set min_buffers_needed to 16
>> media: ti: Use queue min_buffers_needed field to set the min number of
>> buffers
>> media: verisilicon: Stop direct calls to queue num_buffers field
>> media: test-drivers: Stop direct calls to queue num_buffers field
>> media: usb: airspy: Set min_buffers_needed to 8
>> media: usb: cx231xx: Set min_buffers_needed to CX231XX_MIN_BUF
>> media: usb: hackrf: Set min_buffers_needed to 8
>> media: usb: usbtv: Set min_buffers_needed to 2
>> media: atomisp: 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: 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 | 556 +++++++++++-------
>> .../media/common/videobuf2/videobuf2-v4l2.c | 121 +++-
>> drivers/media/dvb-core/dvb_vb2.c | 17 +-
>> drivers/media/dvb-frontends/rtl2832_sdr.c | 9 +-
>> drivers/media/i2c/video-i2c.c | 5 +-
>> drivers/media/pci/cx18/cx18-streams.c | 13 +-
>> drivers/media/pci/dt3155/dt3155.c | 2 -
>> .../pci/netup_unidvb/netup_unidvb_core.c | 4 +-
>> drivers/media/pci/tw68/tw68-video.c | 6 +-
>> drivers/media/pci/tw686x/tw686x-video.c | 13 +-
>> 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/nxp/imx7-media-csi.c | 7 +-
>> drivers/media/platform/renesas/rcar_drif.c | 8 +-
>> drivers/media/platform/st/sti/hva/hva-v4l2.c | 9 +-
>> .../media/platform/ti/am437x/am437x-vpfe.c | 7 +-
>> 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 | 14 +
>> .../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 | 5 +-
>> .../media/test-drivers/vivid/vivid-vbi-out.c | 5 +-
>> .../media/test-drivers/vivid/vivid-vid-cap.c | 5 +-
>> .../media/test-drivers/vivid/vivid-vid-out.c | 5 +-
>> drivers/media/usb/airspy/airspy.c | 9 +-
>> drivers/media/usb/cx231xx/cx231xx-417.c | 4 +-
>> drivers/media/usb/cx231xx/cx231xx-video.c | 4 +-
>> drivers/media/usb/hackrf/hackrf.c | 9 +-
>> drivers/media/usb/usbtv/usbtv-video.c | 3 +-
>> 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 | 8 +-
>> .../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 +-
>> 69 files changed, 969 insertions(+), 502 deletions(-)
>> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst
>>
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