[Bug 67243] [ILK]igt/kms_render/gpu-blit randomly causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67243

--- Comment #13 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 84929
  --> https://bugs.freedesktop.org/attachment.cgi?id=84929&action=edit
fix ilk ring flush workaround

The only notable from your .config was that you're running on 32 bit kernel,
but I couldn't reproduce the hang even on that.

I'm still not sure that it's not a ring flushing issue, since in your last
reply you didn't provide separate results for --run-subtest gpu-blit and
direct-render. Anyway, I noticed that Chris' infinite __wait_seqno patch makes
a clear improvement in gem_quiescent_gpu(), by getting rid of occasional stalls
in it, so it would be worth trying it (and I just realized he also suggested
this earlier on IRC to me). Please give a go to the following:

https://patchwork.kernel.org/patch/2849600/

I also found an igt regression in flush_on_ring_common() and since that is
related to ilk, it's also a possible cause. I attached the fix for it, could
you please try that too?

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