[Intel-gfx] [RFC 0/8] Force preemption

[Chris Wilson]

Quoting Chris Wilson (2018-03-16 20:53:01)
> +static void preempt_reset(struct work_struct *work)
> +{
> +       struct intel_engine_cs *engine =
> +               container_of(work, typeof(*engine), execlists.preempt_reset);
> +

So thinking about the races you had in the reset, you need

tasklet_kill()
tasklet_disable();

> +       if (execlists_is_active(&engine->execlists, EXECLISTS_ACTIVE_PREEMPT))
> +               i915_handle_error(engine->i915, BIT(engine->id), 0,
> +                                 "preemption timed out on %s", engine->name);

tasklet_enable();

here for the serialisation on EXECLISTS_ACTIVE_PREEMPT.
-Chris