[Bug 63921] [snb] GTT mapping fails after GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63921

--- Comment #40 from Nicolas Hillegeer <nicolashillegeer at gmail.com> ---
(In reply to comment #39)
> Created attachment 78538 [details] [review]
> Potentially make reset work
> 
> Based on 3.9-rc8.
> 
> Please run, reproduce hang, and and post the result of dmesg | grep PCH

Ok, I will start compiling the kernel with your patch. With or without Chris'
EIO suppressions? I'm going to leave them out for now, since you want dmesg
output and both your first and Chris' later patches made the system lock up in
a way that I couldn't get to dmesg anymore. I even tried some magic sysrq
tricks to no avail.

I'll report back after I reproduce the crash. 

Also don't know if you saw me mentioning it, but the Ivy Bridge system that I'm
now running since 1.5 days with 32 (!) simultaneous videos (and before that 4
days with 16 simultaneous videos without reboot) is still going strong without
even showing slowdown, which invariably does happen to the Sandy Bridge
systems.

I'm not sure how different the DRM (or any other subsystem really) treat gen6
and gen7, or how different the hardware really is, but maybe the solution is in
there. Just an uneducated guess though.

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