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<body><span class="vcard"><a class="email" href="mailto:dmitry.v.rogozhkin@intel.com" title="Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>"> <span class="fn">Dmitry Rogozhkin</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [TGL] media VME encoding GPU hang w/o i915 error state captured"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112377">bug 112377</a>
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<td>mika.kuoppala@intel.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [TGL] media VME encoding GPU hang w/o i915 error state captured"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112377#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [TGL] media VME encoding GPU hang w/o i915 error state captured"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112377">bug 112377</a>
from <span class="vcard"><a class="email" href="mailto:dmitry.v.rogozhkin@intel.com" title="Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>"> <span class="fn">Dmitry Rogozhkin</span></a>
</span></b>
<pre>This occurs to be a regression in drm-tip or a change which should be reflected
on user space as well. Git bisect points to the following commit. Reverting it
makes the use case pass. @Mika: can you, please, comment why the change could
break media usage?
commit 08fff7aeddc9dd72161b4c8fc27fbab12b4b9352
Author: Mika Kuoppala <<a href="mailto:mika.kuoppala@linux.intel.com">mika.kuoppala@linux.intel.com</a>>
Date: Tue Oct 15 18:44:49 2019 +0300
drm/i915/tgl: Wa_1607138340
Avoid possible cs hang with semaphores by disabling
lite restore.
Signed-off-by: Mika Kuoppala <<a href="mailto:mika.kuoppala@linux.intel.com">mika.kuoppala@linux.intel.com</a>>
Reviewed-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20191015154449.10338-11-mika.kuoppala@linux.intel.com">https://patchwork.freedesktop.org/patch/msgid/20191015154449.10338-11-mika.kuoppala@linux.intel.com</a>
I am attaching:
1. Git bisect log
2. i915 error state dumped from kernel @904ce198 (this kernel does not have
preemption timeout)</pre>
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