[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #86 from Christopher Wawak <cwawak at redhat.com> ---
Created attachment 79979
  --> https://bugs.freedesktop.org/attachment.cgi?id=79979&action=edit
i915_error_state - 3.9.2-201.rhbz879823.fc18.x86_64 (included patch write mbox
regs twice on snb, v2)

Linux bobloblaw 3.9.2-201.rhbz879823.fc18.x86_64 #1 SMP Thu May 16 13:35:12 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux

[45482.757631] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[45482.757645] [drm] capturing error event; look for more information
in/sys/kernel/debug/dri/0/i915_error_state
[45482.766942] [drm:kick_ring] *ERROR* Kicking stuck semaphore on render ring
[45482.770617] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for
forcewake old ack to clear.

I added patch (drm/i915: Resurrect ring kicking for semaphores, selectively) to
Fedora 18's 3.9.2-200 x86_64 kernel.

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