[Intel-gfx] [PATCH 05/10] drm/i915: Engine busy time tracking

[Chris Wilson]

Quoting Tvrtko Ursulin (2017-09-29 13:34:55)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Track total time requests have been executing on the hardware.
> 
> We add new kernel API to allow software tracking of time GPU
> engines are spending executing requests.
> 
> Both per-engine and global API is added with the latter also
> being exported for use by external users.
> 
> v2:
>  * Squashed with the internal API.
>  * Dropped static key.
>  * Made per-engine.
>  * Store time in monotonic ktime.
> 
> v3: Moved stats clearing to disable.
> 
> v4:
>  * Comments.
>  * Don't export the API just yet.
> 
> v5: Whitespace cleanup.
> 
> v6:
>  * Rename ref to active.
>  * Drop engine aggregate stats for now.
>  * Account initial busy period after enabling stats.
> 
> v7:
>  * Rebase.
> 
> v8:
>  * Move context in notification after the notifier. (Chris Wilson)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris