Quoting Chris Wilson (2018-03-12 13:23:22)
> For the convenience of userspace passing in an arbitrary reset mask,
> remove unknown engines from the set of engines that are to be reset.
> This means that we always follow a per-engine reset with a full-device
+ would mean, followed
> reset when userspace writes -1 into debugfs/i915_wedged.
+ , which we then mistook as a failed reset and wedged the driver.
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