[Intel-gfx] [PATCH] drm/i915: Trim error mask to known engines

[Chris Wilson]

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.
-Chris