[Bug 43267] [SNB rc6] GPU hangs with i915_enable_rc6=1

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https://bugzilla.kernel.org/show_bug.cgi?id=43267





--- Comment #60 from jrierab <jrierab at gmail.com>  2013-04-01 15:45:36 ---
Created an attachment (id=96921)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=96921)
Full report (dmesg, cpuinfo, version, /proc/dri/0/* etc...) mainline kernel
3.9..0-rc5 + UXA

Sorry for taking too long to try your patch, Rodrigo. I've not had much time in
the last few weeks...

Today I tested the last kernel 3.9.0-rc5 from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-rc5-raring/ with UXA active
and last intel drivers from xorg-edgers ppa (no i915_enable_rc6 trick). No "GPU
hung" for more than 3 hours uptime running glxgears and compiling linux kernel.

However, there are symptoms of the/some bug. Lot's of:
- [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for forcewake to ack
request.
- [drm:__gen6_gt_wait_for_thread_c0] *ERROR* GT thread status wait timed out
- and some crashes also.

>From the user point-of-view, only some half-a-second non-responsive UI when a
crash happens (only 2 times in 3 hours, 575s and 9620s in dmesg log file). So
the system seems to be perfectly usable. Far better than before in any case.

The attached report file contains a directory 'Reports' with all the info from
the first crash (aprox. 575s uptime), after the first half-a-second noticeable
freeze of UI. Also, there is a 'dmesg_3.9.0-rc5_12000.txt' with full dmesg log
(uptime more than 3:20h) to see the error frequency.

In the meantime, I updated my kernel source from git and tried to apply your
patch. It was partially rejected (*.rej files are included in the report also).
However, I compiled it anyway and it is running just now, while I'm writting.
The glxgears demo is also running from the beginning, and up to now, 3600s
uptime, no sign of any bug in dmesg. So, I will continue to test it and inform
here about the results.

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