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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear."
href="https://bugs.freedesktop.org/show_bug.cgi?id=89959#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear."
href="https://bugs.freedesktop.org/show_bug.cgi?id=89959">bug 89959</a>
from <span class="vcard"><a class="email" href="mailto:mika.kuoppala@intel.com" title="Mika Kuoppala <mika.kuoppala@intel.com>"> <span class="fn">Mika Kuoppala</span></a>
</span></b>
<pre>(In reply to ye.tian from <a href="show_bug.cgi?id=89959#c7">comment #7</a>)
<span class="quote">> (In reply to Mika Kuoppala from <a href="show_bug.cgi?id=89959#c6">comment #6</a>)
> > 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.</span >
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.</pre>
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