[Bug 89959] [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89959

--- Comment #8 from Mika Kuoppala <mika.kuoppala at intel.com> ---
(In reply to ye.tian from comment #7)
> (In reply to Mika Kuoppala from comment #6)
> > Can you reproduce similar problem with forcewake with enough runs of
> > gem_render_copy and gem_render_copy_redux?
> > 
> > Try: 'while ./gem_render_copy ; do date ; done'
> 
> I can not reproduce similar problem.

There is evidence that the forcewake ack clearing error is a symptom of
accessing the blitter ring post reset.

That indicates that our reinitialization after reset might be incomplete on
skl.

If 'cat /sys/kernel/debug/dri/0/i915_wedged' is not zero when forcewake ack
errors start to mount, that would support the incomplete initialization
hypothesis.

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