[Intel-gfx] [PATCH] drm/i915/guc: Disable preemption if it fails

[Chris Wilson]

Quoting Singh, Satyeshwar (2018-05-31 22:17:25)
> Hi Chris,
> Isn't this dependent upon the workload submitted to the GuC? Meaning we have one workload that refused to be preempted (really long shader for example) but it went away on its own. Other workloads that come in later are preemptible. However, if we turn off preemption permanently, then all future workloads will not be preempted either which may not be desirable.

Whoever implements the recovery mechanism can clear the flag. You may
like to clear the flag on reset? We would have to be more careful about
the manipulation of engine->flags as it's not serialised atm (since it's
_meant_ to be write-once during init).
-Chris