[Bug 112377] [TGL] media VME encoding GPU hang w/o i915 error state captured

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112377

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Eero Tamminen from comment #5)
> (In reply to Chris Wilson from comment #3)
> > Forced preemption occurs when a lower priority batch does not yield the GPU
> > to a higher preemption request [which is a denial-of-service from one and a
> > quality-of-service guarantee for the other], over a certain timeout.
> 
> What is higher pre-emption request in this case?

priority.

> (Maybe dmesg output could identify also the higher priority process?)

It's not the one at fault, it can be anything including the heartbeat.


> (In reply to Chris Wilson from comment #1)
> > It's a forced preemption; reset from softirq context prohibits error capture
> > and would further compromise the QoS of the more important task.
> 
> Is there some option to enable error capture also in that case?

The option is to turn off this mode. The means to do that are likely to change
when we add more knobs other than modparams.

> (Otherwise debugging those issues would become really hard...)

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