[Bug 111424] Random recoverable GPU hangs in trivial GpuTest Triangle test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111424

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
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.

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