This is likely to be:
commit c501ae7f332cdaf42e31af30b72b4b66cbbb1604
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Wed Dec 14 13:57:23 2011 +0100
drm/i915: Only clear the GPU domains upon a successful finish
By clearing the GPU read domains before waiting upon the buffer, we run
the risk of the wait being interrupted and the domains prematurely
cleared. The next time we attempt to wait upon the buffer (after
userspace handles the signal), we believe that the buffer is idle and so
skip the wait.
There are a number of bugs across all generations which show signs of an
overly haste reuse of active buffers.
Such as:
https://bugs.freedesktop.org/show_bug.cgi?id=29046
https://bugs.freedesktop.org/show_bug.cgi?id=35863
https://bugs.freedesktop.org/show_bug.cgi?id=38952
https://bugs.freedesktop.org/show_bug.cgi?id=40282
https://bugs.freedesktop.org/show_bug.cgi?id=41098
https://bugs.freedesktop.org/show_bug.cgi?id=41102
https://bugs.freedesktop.org/show_bug.cgi?id=41284
https://bugs.freedesktop.org/show_bug.cgi?id=42141
A couple of those pre-date i915_gem_object_finish_gpu(), so may be
unrelated (such as a wild write from a userspace command buffer), but
this does look like a convincing cause for most of those bugs.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: sta...@kernel.org
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Reviewed-by: Eugeni Dodonov <eugeni.dodo...@intel.com>
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
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https://bugs.launchpad.net/bugs/899303
Title:
[gm45] GPU locks up for a few seconds then recovers when using
xscreensaver on random
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