linux-kernel - Re: [PATCH v1] media: cedrus: Propagate error code from cedrus_h265_skip

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Message-ID: <12078224.O9o76ZdvQC@jernej-laptop>
Date:   Tue, 25 Oct 2022 06:59:01 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v1] media: cedrus: Propagate error code from cedrus_h265_skip_bits()

Hi Hans,

Dne ponedeljek, 24. oktober 2022 ob 13:38:36 CEST je Hans Verkuil napisal(a):
> Hi Dmitry,
> 
> This patch has a conflict with this patch from Jernej:
> 
> https://patchwork.linuxtv.org/project/linux-media/patch/20221017194413.11983
> 01-1-jernej.skrabec@...il.com/
> 
> I decided to take Jernej's patch first. Can you make a v2 that sits on top
> of that patch?

I believe you already merged first version of the patch for 6.1. No need for 
this version though, first version already solves main issue.

Best regards,
Jernej

> 
> Thanks!
> 
> 	Hans
> 
> On 9/14/22 17:01, Dmitry Osipenko wrote:
> > The cedrus_h265_skip_bits() may get into infinite loop if decoding
> > parameters are incorrect. In this case we detect the loop and print
> > a error message, continuing the decoding that is fated to fail.
> > 
> > Will be cleaner to abort the decoding early. Propagate the error code
> > to cedrus_device_run() and reset hardware on the cedrus_h265_skip_bits()
> > failure.
> > 
> > Suggested-by: Jernej Škrabec <jernej.skrabec@...il.com>
> > Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> > ---
> > 
> >  drivers/staging/media/sunxi/cedrus/cedrus_dec.c  |  2 ++
> >  drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 15 ++++++++++++---
> >  drivers/staging/media/sunxi/cedrus/cedrus_hw.c   |  7 ++++++-
> >  drivers/staging/media/sunxi/cedrus/cedrus_hw.h   |  2 ++
> >  4 files changed, 22 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> > b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c index
> > e7f7602a5ab4..ae5df3dc01c0 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> > @@ -112,6 +112,8 @@ void cedrus_device_run(void *priv)
> > 
> >  		dev->dec_ops[ctx->current_codec]->trigger(ctx);
> >  	
> >  	} else {
> > 
> > +		cedrus_hw_reset(dev);
> > +
> > 
> >  		v4l2_m2m_buf_done_and_job_finish(ctx->dev->m2m_dev,
> >  		
> >  						 ctx-
>fh.m2m_ctx,
> >  						 
VB2_BUF_STATE_ERROR);
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c index
> > 4952fc17f3e6..f409f59452d8 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> > @@ -224,9 +224,10 @@ static void cedrus_h265_pred_weight_write(struct
> > cedrus_dev *dev,> 
> >  	}
> >  
> >  }
> > 
> > -static void cedrus_h265_skip_bits(struct cedrus_dev *dev, int num)
> > +static int cedrus_h265_skip_bits(struct cedrus_dev *dev, int num)
> > 
> >  {
> >  
> >  	int count = 0;
> > 
> > +	int err;
> > 
> >  	while (count < num) {
> >  	
> >  		int tmp = min(num - count, 32);
> > 
> > @@ -235,11 +236,16 @@ static void cedrus_h265_skip_bits(struct cedrus_dev
> > *dev, int num)> 
> >  			     VE_DEC_H265_TRIGGER_FLUSH_BITS |
> >  			     VE_DEC_H265_TRIGGER_TYPE_N_BITS(tmp));
> > 
> > -		if (cedrus_wait_for(dev, VE_DEC_H265_STATUS,
> > VE_DEC_H265_STATUS_VLD_BUSY)) +		err = cedrus_wait_for(dev,
> > VE_DEC_H265_STATUS, VE_DEC_H265_STATUS_VLD_BUSY); +		if 
(err) {
> > 
> >  			dev_err_ratelimited(dev->dev, "timed out 
waiting to skip bits\n");
> > 
> > +			return err;
> > +		}
> > 
> >  		count += tmp;
> >  	
> >  	}
> > 
> > +
> > +	return 0;
> > 
> >  }
> >  
> >  static void cedrus_h265_write_scaling_list(struct cedrus_ctx *ctx,
> > 
> > @@ -408,6 +414,7 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx,
> > struct cedrus_run *run)> 
> >  	u32 pic_order_cnt[2];
> >  	u8 *padding;
> >  	int count;
> > 
> > +	int err;
> > 
> >  	u32 reg;
> >  	
> >  	sps = run->h265.sps;
> > 
> > @@ -534,7 +541,9 @@ static int cedrus_h265_setup(struct cedrus_ctx *ctx,
> > struct cedrus_run *run)> 
> >  	/* Include the one bit. */
> >  	count++;
> > 
> > -	cedrus_h265_skip_bits(dev, slice_params->data_byte_offset * 8 - 
count);
> > +	err = cedrus_h265_skip_bits(dev, slice_params->data_byte_offset * 8 
-
> > count); +	if (err)
> > +		return err;
> > 
> >  	/* Bitstream parameters. */
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
> > b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c index
> > a6470a89851e..e9ceca332062 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
> > @@ -168,11 +168,16 @@ void cedrus_watchdog(struct work_struct *work)
> > 
> >  					 
VB2_BUF_STATE_ERROR);
> >  
> >  }
> > 
> > +void cedrus_hw_reset(struct cedrus_dev *dev)
> > +{
> > +	reset_control_reset(dev->rstc);
> > +}
> > +
> > 
> >  int cedrus_hw_suspend(struct device *device)
> >  {
> >  
> >  	struct cedrus_dev *dev = dev_get_drvdata(device);
> > 
> > -	reset_control_assert(dev->rstc);
> > +	cedrus_hw_reset(dev);
> > 
> >  	clk_disable_unprepare(dev->ram_clk);
> >  	clk_disable_unprepare(dev->mod_clk);
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_hw.h
> > b/drivers/staging/media/sunxi/cedrus/cedrus_hw.h index
> > 7c92f00e36da..919c4475f0d7 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_hw.h
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_hw.h
> > @@ -30,4 +30,6 @@ void cedrus_hw_remove(struct cedrus_dev *dev);
> > 
> >  void cedrus_watchdog(struct work_struct *work);
> > 
> > +void cedrus_hw_reset(struct cedrus_dev *dev);
> > +
> > 
> >  #endif