[Intel-gfx] drm/i915: Watchdog timeout: IRQ handler for gen8+

[Chris Wilson]

Quoting Tvrtko Ursulin (2019-01-07 16:58:24)
> And finally there is one programming restriction which says:
> 
>   * SW must not preempt the workload which has watchdog enabled. Either 
> it must:
> 
> a) disable preemption for that workload completely, or
> b) disable the watchdog via mmio write before any write to ELSP

Oh dear. I'm at a loss for words. Any ELSP write, *shudders*.
-Chris