[Bug 83677] [HSW] GPU hang on ctx load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83677

--- Comment #45 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #44)
> (In reply to comment #42)
> > Thanks, the missed irq/seqno coherency is worrying enough, but at least it
> > confirms that there is some magic in there that seems to prevent the ctx
> > load error. Do you mind keeping that test system running until a bug shows
> > itself?
> 
> Still no further issues.
> 
> It looks like I can only provoke that message by restarting X and the
> compositor; would you like me to set that going in an endless loop and see
> if it BUG()s?

Nah, worked out the cause there. It is the ivb+ blt irq coherency bug, and a
bad interaction of patches in my branch broke the w/a.

I've been trying to think as to what other magic could be in s/seqno/requests/
that fixup the ctx hang. I think we have more or less explored the ctx specific
parts of the patch. So now what? :|

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