drm/i915/selftests: Dump engine state and trace upon hanging after reset
If the engine dies after a reset, and so we fail to submit a request but need to be interrupted by the CI runner, dump the engine state. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200615165013.22973-2-chris@chris-wilson.co.uk
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