[Bug 83677] [HSW] GPU HANG: ecode 0:0x87d3bffa on ctx load

[bugzilla-daemon at freedesktop.org]

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

--- Comment #53 from Simon Farnsworth <simon at farnz.org.uk> ---
Created attachment 108029
  --> https://bugs.freedesktop.org/attachment.cgi?id=108029&action=edit
Backport of requests and PPGTT changes to 3.17.0

I've backported the changes from #requests to apply against the kernel RPM from
http://koji.fedoraproject.org/koji/buildinfo?buildID=583526

This is a fairly intrusive backport - I've tried to take drivers/gpu/drm/i915
wholesale, then remove execlists/logical ring contexts rather than piecemeal
bring things forwards.

I'd appreciate it if someone could look over what I've done, and tell me if it
makes sense.

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