[Intel-gfx] [PATCH v4 1/2] drm/i915: Make for_each_engine_masked work on intel_gt

[Chris Wilson]

Quoting Tvrtko Ursulin (2019-10-17 17:18:52)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Medium term goal is to eliminate the i915->engine[] array and to get there
> we have recently introduced equivalent array in intel_gt. Now we need to
> migrate the code further towards this state.
> 
> This next step is to eliminate usage of i915->engines[] from the
> for_each_engine_masked iterator.
> 
> For this to work we also need to use engine->id as index when populating
> the gt->engine[] array and adjust the default engine set indexing to use
> engine->legacy_idx instead of assuming gt->engines[] indexing.
> 
> v2:
>   * Populate gt->engine[] earlier.
>   * Check that we don't duplicate engine->legacy_idx
> 
> v3:
>   * Work around the initialization order issue between default_engines()
>     and intel_engines_driver_register() which sets engine->legacy_idx for
>     now. It will be fixed properly later.
> 
> v4:
>   * Merge with forgotten v2.5.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

* fingers crossed
-Chris