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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Random recoverable GPU hangs in trivial GpuTest Triangle test"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111424#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Random recoverable GPU hangs in trivial GpuTest Triangle test"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111424">bug 111424</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>The current sampling is ACTHD (batch/ring head address, updates with batch
buffer) + RING_START (to spot context switches) + RING_HEAD (includes wrap
counter so effectively ~24b). Only if they all match plus some fuzzing of
INSTDONE do we worry about the GPU being hung.
We could now throw in an engine->serial [submission serial] and only declare a
hang if we stop submitting (which would be CS freeze on execlists, and ring
full on ringbuffer). Or we can go with the heartbeat scheme.
If the drm-tip result is typical, the engine reset should be harmless.</pre>
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