[Bug 96526] [BSW / APL] [BAT execlists] gem_exec_suspend basic-s4 GPU hang after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96526

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
It's hard to tell because we don't record the request->head in the error state
(review sigh), but my inkling is that it is actually dying with HEAD before our
request, and it is just that using stolen has invalid content triggering the
hang. Following that suspicion it would be that we are flushing the context
image to coherent memory before the hibernation image is made.

Quickest way to test that theory would be to reset the HEAD/TAIL in the context
image upon resume.

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