Re: [PATCH] drm/etnaviv: print offender task information on hangcheck recovery

[Lucas Stach <l.stach@pengutronix.de>]

Am Mittwoch, dem 22.06.2022 um 10:52 +0200 schrieb Lucas Stach:
> Hi Christian,
> 
> Am Freitag, dem 03.06.2022 um 14:37 +0200 schrieb Christian Gmeiner:
> > Track the pid per submit, so we can print the name and cmdline of
> > the task which submitted the batch that caused the gpu to hang.
> > 
> I really like the idea. I think the pid handling could be integrated
> into the scheduler, so we don't have to carry it on each submit, but
> not requesting any changes right now. I'm leaning toward taking this
> patch as-is and doing the scheduler integration as a second step.
> 
Applied to etnaviv/next.

Regards,
Lucas
> 
> > Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
> > ---
> >  drivers/gpu/drm/etnaviv/etnaviv_gem.h        |  1 +
> >  drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c |  6 ++++++
> >  drivers/gpu/drm/etnaviv/etnaviv_gpu.c        | 18 +++++++++++++++++-
> >  drivers/gpu/drm/etnaviv/etnaviv_gpu.h        |  2 +-
> >  drivers/gpu/drm/etnaviv/etnaviv_sched.c      |  2 +-
> >  5 files changed, 26 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
> > index 63688e6e4580..baa81cbf701a 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
> > @@ -96,6 +96,7 @@ struct etnaviv_gem_submit {
> >  	int out_fence_id;
> >  	struct list_head node; /* GPU active submit list */
> >  	struct etnaviv_cmdbuf cmdbuf;
> > +	struct pid *pid;       /* submitting process */
> >  	bool runtime_resumed;
> >  	u32 exec_state;
> >  	u32 flags;
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> > index 1ac916b24891..1491159d0d20 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
> > @@ -399,6 +399,9 @@ static void submit_cleanup(struct kref *kref)
> >  		mutex_unlock(&submit->gpu->fence_lock);
> >  		dma_fence_put(submit->out_fence);
> >  	}
> > +
> > +	put_pid(submit->pid);
> > +
> >  	kfree(submit->pmrs);
> >  	kfree(submit);
> >  }
> > @@ -422,6 +425,7 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
> >  	struct sync_file *sync_file = NULL;
> >  	struct ww_acquire_ctx ticket;
> >  	int out_fence_fd = -1;
> > +	struct pid *pid = get_pid(task_pid(current));
> >  	void *stream;
> >  	int ret;
> >  
> > @@ -519,6 +523,8 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
> >  		goto err_submit_ww_acquire;
> >  	}
> >  
> > +	submit->pid = pid;
> > +
> >  	ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &submit->cmdbuf,
> >  				  ALIGN(args->stream_size, 8) + 8);
> >  	if (ret)
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > index 37018bc55810..7d9bf4673e2d 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > @@ -1045,12 +1045,28 @@ int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m)
> >  }
> >  #endif
> >  
> > -void etnaviv_gpu_recover_hang(struct etnaviv_gpu *gpu)
> > +void etnaviv_gpu_recover_hang(struct etnaviv_gem_submit *submit)
> >  {
> > +	struct etnaviv_gpu *gpu = submit->gpu;
> > +	char *comm = NULL, *cmd = NULL;
> > +	struct task_struct *task;
> >  	unsigned int i;
> >  
> >  	dev_err(gpu->dev, "recover hung GPU!\n");
> >  
> > +	task = get_pid_task(submit->pid, PIDTYPE_PID);
> > +	if (task) {
> > +		comm = kstrdup(task->comm, GFP_KERNEL);
> > +		cmd = kstrdup_quotable_cmdline(task, GFP_KERNEL);
> > +		put_task_struct(task);
> > +	}
> > +
> > +	if (comm && cmd)
> > +		dev_err(gpu->dev, "offending task: %s (%s)\n", comm, cmd);
> > +
> > +	kfree(cmd);
> > +	kfree(comm);
> > +
> >  	if (pm_runtime_get_sync(gpu->dev) < 0)
> >  		goto pm_put;
> >  
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> > index 85eddd492774..b3a0941d56fd 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> > @@ -168,7 +168,7 @@ bool etnaviv_fill_identity_from_hwdb(struct etnaviv_gpu *gpu);
> >  int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m);
> >  #endif
> >  
> > -void etnaviv_gpu_recover_hang(struct etnaviv_gpu *gpu);
> > +void etnaviv_gpu_recover_hang(struct etnaviv_gem_submit *submit);
> >  void etnaviv_gpu_retire(struct etnaviv_gpu *gpu);
> >  int etnaviv_gpu_wait_fence_interruptible(struct etnaviv_gpu *gpu,
> >  	u32 fence, struct drm_etnaviv_timespec *timeout);
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> > index 72e2553fbc98..d29f467eee13 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
> > @@ -67,7 +67,7 @@ static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
> >  
> >  	/* get the GPU back into the init state */
> >  	etnaviv_core_dump(submit);
> > -	etnaviv_gpu_recover_hang(gpu);
> > +	etnaviv_gpu_recover_hang(submit);
> >  
> >  	drm_sched_resubmit_jobs(&gpu->sched);
> >  
> 
>