[Intel-gfx] [PATCH v1 3/3] drm/i915/gt: Timeout when waiting for idle in suspending

[Teres Alexis, Alan Previn]

Thanks Rodrigo for reviewing this.

On Mon, 2023-08-07 at 13:56 -0400, Vivi, Rodrigo wrote:
> On Wed, Aug 02, 2023 at 04:35:01PM -0700, Alan Previn wrote:
> > When suspending, add a timeout when calling
> > intel_gt_pm_wait_for_idle else if we have a lost
> > G2H event that holds a wakeref (which would be
> > indicating of a bug elsewhere in the driver), we
> > get to complete the suspend-resume cycle, albeit
> > without all the lower power hw counters hitting
> > its targets, instead of hanging in the kernel.
> > 
alan:snip

> > -int intel_wakeref_wait_for_idle(struct intel_wakeref *wf)
> > +int intel_wakeref_wait_for_idle(struct intel_wakeref *wf, int timeout_ms)
> >  {
> > -	int err;
> > +	int err = 0;
> >  
> >  	might_sleep();
> >  
> > -	err = wait_var_event_killable(&wf->wakeref,
> > -				      !intel_wakeref_is_active(wf));
> > +	if (!timeout_ms)
> > +		err = wait_var_event_killable(&wf->wakeref,
> > +					      !intel_wakeref_is_active(wf));
> > +	else if (wait_var_event_timeout(&wf->wakeref,
> > +					!intel_wakeref_is_active(wf),
> > +					msecs_to_jiffies(timeout_ms)) < 1)
> > +		err = -ETIME;
> 
> it looks to me that -ETIMEDOUT would be a better error.
alan: okay - will do, thanks.