Re: [PATCH v4 06/12] media: verisilicon: Check AV1 bitstreams bit depth

From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
To: Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Cc: p.zabel@pengutronix.de, mchehab@kernel.org, robh+dt@kernel.org,
	 krzysztof.kozlowski+dt@linaro.org, heiko@sntech.de,
	hverkuil@xs4all.nl,  jernej.skrabec@gmail.com,
	linux-media@vger.kernel.org,  linux-rockchip@lists.infradead.org,
	devicetree@vger.kernel.org,
	 linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,  kernel@collabora.com
Subject: Re: [PATCH v4 06/12] media: verisilicon: Check AV1 bitstreams bit depth
Date: Mon, 20 Feb 2023 14:00:32 -0500	[thread overview]
Message-ID: <6997fe5cbcfef626340ce4d85095eadb7bc63067.camel@collabora.com> (raw)
In-Reply-To: <c4d355d5-5e14-8eba-1944-fc26b1050cf5@collabora.com>

Le lundi 20 février 2023 à 17:24 +0100, Benjamin Gaignard a écrit :
> Le 18/02/2023 à 14:11, Ezequiel Garcia a écrit :
> > On Tue, Feb 14, 2023 at 11:06 AM Benjamin Gaignard
> > <benjamin.gaignard@collabora.com> wrote:
> > > The driver supports 8 and 10 bits bitstreams, make sure to discard
> > > other cases.
> > > It could happens that userland test if V4L2_CID_STATELESS_AV1_SEQUENCE
> > > exists without setting bit_depth field in this case use
> > > HANTRO_DEFAULT_BIT_DEPTH value.
> > > 
> > This shouldn't happen.
> > 
> > If the bit_depth argument in hantro_check_depth_match()
> > can be set unchecked by userspace, we have done something wrong!!
> > 
> > Are you sure that userspace can do a S_CTRL with an invalid bit-depth?
> > The try_or_set_cluster() function seems to always call try_ctrl before s_ctrl.
> 
> I have dump the stack when AV1 sequence bit depth = 0 in s_ctrl.
> It is happening when opening the driver, v4l2 setup the ctrls by calling __v4l2_ctrl_handler_setup()
> this led to call hantro_av1_s_ctrl() with empty structure.
> 
> For other codecs isn't a problem because bit depth is coded with a minus 8 value (ie: 8 bits = 0)
> while for AV1 it is the real value (ie: 8 bits = 8).

Shouldn't this be fixed in v4l2-ctrls-core.c / std_init_compound() ? This is
what we do for VP9:

	case V4L2_CTRL_TYPE_VP9_FRAME:
		p_vp9_frame = p;
		p_vp9_frame->profile = 0;
		p_vp9_frame->bit_depth = 8;
		p_vp9_frame->flags |= V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING |
			V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING;
		break;

> 
> [   88.478751] Hardware name: Radxa Rock 5A Board (DT)
> [   88.479184] Call trace:
> [   88.479406]  dump_backtrace.part.0+0xdc/0xf0
> [   88.479796]  show_stack+0x18/0x30
> [   88.480099]  dump_stack_lvl+0x68/0x84
> [   88.480431]  dump_stack+0x18/0x34
> [   88.480732]  hantro_av1_s_ctrl+0x7c/0xcc [hantro_vpu]
> [   88.481211]  __v4l2_ctrl_handler_setup+0x120/0x154
> [   88.481643]  v4l2_ctrl_handler_setup+0x2c/0x50
> [   88.482043]  hantro_open+0x138/0x204 [hantro_vpu]
> [   88.482490]  v4l2_open+0xa8/0x124
> [   88.482794]  chrdev_open+0xc0/0x22c
> [   88.483114]  do_dentry_open+0x13c/0x490
> [   88.483464]  vfs_open+0x2c/0x40
> [   88.483749]  path_openat+0x878/0xe50
> [   88.484074]  do_filp_open+0x80/0x130
> [   88.484399]  do_sys_openat2+0xb4/0x170
> [   88.484736]  __arm64_sys_openat+0x60/0xb0
> [   88.485097]  invoke_syscall+0x48/0x114
> [   88.485437]  el0_svc_common.constprop.0+0x44/0xfc
> [   88.485860]  do_el0_svc+0x3c/0xc0
> [   88.486163]  el0_svc+0x2c/0x84
> [   88.486441]  el0t_64_sync_handler+0xbc/0x140
> [   88.486826]  el0t_64_sync+0x190/0x194
> 
> Regards,
> Benjamin
> 
> > 
> > Thanks,
> > Ezequiel
> > 
> > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> > > ---
> > > version 4:
> > > - This patch is the result of squashing "Save bit depth for AV1 decoder"
> > >    and "Check AV1 bitstreams bit depth" of version 3 + adapation to
> > >    "[PATCH v8 0/6] media: verisilicon: HEVC: fix 10bits handling" series.
> > > 
> > >   .../media/platform/verisilicon/hantro_drv.c   | 36 +++++++++++++++++++
> > >   .../media/platform/verisilicon/hantro_v4l2.c  |  4 +++
> > >   2 files changed, 40 insertions(+)
> > > 
> > > diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> > > index bc1a85456142..666cd46902da 100644
> > > --- a/drivers/media/platform/verisilicon/hantro_drv.c
> > > +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> > > @@ -275,7 +275,13 @@ static int hantro_try_ctrl(struct v4l2_ctrl *ctrl)
> > >                  /* We only support profile 0 */
> > >                  if (dec_params->profile != 0)
> > >                          return -EINVAL;
> > > +       } else if (ctrl->id == V4L2_CID_STATELESS_AV1_SEQUENCE) {
> > > +               const struct v4l2_ctrl_av1_sequence *sequence = ctrl->p_new.p_av1_sequence;
> > > +
> > > +               if (sequence->bit_depth != 8 && sequence->bit_depth != 10)
> > > +                       return -EINVAL;
> > >          }
> > > +
> > >          return 0;
> > >   }
> > > 
> > > @@ -348,6 +354,30 @@ static int hantro_hevc_s_ctrl(struct v4l2_ctrl *ctrl)
> > >          return 0;
> > >   }
> > > 
> > > +static int hantro_av1_s_ctrl(struct v4l2_ctrl *ctrl)
> > > +{
> > > +       struct hantro_ctx *ctx;
> > > +
> > > +       ctx = container_of(ctrl->handler,
> > > +                          struct hantro_ctx, ctrl_handler);
> > > +
> > > +       switch (ctrl->id) {
> > > +       case V4L2_CID_STATELESS_AV1_SEQUENCE:
> > > +       {
> > > +               int bit_depth = ctrl->p_new.p_av1_sequence->bit_depth;
> > > +
> > > +               if (ctx->bit_depth == bit_depth)
> > > +                       return 0;
> > > +
> > > +               return hantro_reset_raw_fmt(ctx, bit_depth);
> > > +       }
> > > +       default:
> > > +               return -EINVAL;
> > > +       }
> > > +
> > > +       return 0;
> > > +}
> > > +
> > >   static const struct v4l2_ctrl_ops hantro_ctrl_ops = {
> > >          .try_ctrl = hantro_try_ctrl,
> > >   };
> > > @@ -365,6 +395,11 @@ static const struct v4l2_ctrl_ops hantro_hevc_ctrl_ops = {
> > >          .s_ctrl = hantro_hevc_s_ctrl,
> > >   };
> > > 
> > > +static const struct v4l2_ctrl_ops hantro_av1_ctrl_ops = {
> > > +       .try_ctrl = hantro_try_ctrl,
> > > +       .s_ctrl = hantro_av1_s_ctrl,
> > > +};
> > > +
> > >   #define HANTRO_JPEG_ACTIVE_MARKERS     (V4L2_JPEG_ACTIVE_MARKER_APP0 | \
> > >                                           V4L2_JPEG_ACTIVE_MARKER_COM | \
> > >                                           V4L2_JPEG_ACTIVE_MARKER_DQT | \
> > > @@ -542,6 +577,7 @@ static const struct hantro_ctrl controls[] = {
> > >                  .codec = HANTRO_AV1_DECODER,
> > >                  .cfg = {
> > >                          .id = V4L2_CID_STATELESS_AV1_SEQUENCE,
> > > +                       .ops = &hantro_av1_ctrl_ops,
> > >                  },
> > >          }, {
> > >                  .codec = HANTRO_AV1_DECODER,
> > > diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > index 992c5baa929f..7e74e47c9a89 100644
> > > --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > @@ -86,6 +86,10 @@ hantro_check_depth_match(const struct hantro_fmt *fmt, int bit_depth)
> > >          if (!fmt->match_depth && !fmt->postprocessed)
> > >                  return true;
> > > 
> > > +       /* 0 means default depth, which is 8 */
> > > +       if (!bit_depth)
> > > +               bit_depth = HANTRO_DEFAULT_BIT_DEPTH;
> > > +
> > >          fmt_depth = hantro_get_format_depth(fmt->fourcc);
> > > 
> > >          /*
> > > --
> > > 2.34.1
> > > 

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