[Intel-gfx] [RFC 08/14] drm/i915: Store backpointer to intel_gt in the engine

[Daniele Ceraolo Spurio]

On 6/10/19 9:16 AM, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2019-06-10 16:54:13)
>> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
>> index 01223864237a..343c4459e8a3 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
>> +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
>> @@ -34,6 +34,7 @@ struct drm_i915_reg_table;
>>   struct i915_gem_context;
>>   struct i915_request;
>>   struct i915_sched_attr;
>> +struct intel_gt;
>>   struct intel_uncore;
>>   
>>   typedef u8 intel_engine_mask_t;
>> @@ -266,6 +267,7 @@ struct intel_engine_execlists {
>>   
>>   struct intel_engine_cs {
>>          struct drm_i915_private *i915;
>> +       struct intel_gt *gt;
> 
> I'd push for gt as being the backpointer, and i915 its distant grand
> parent. Not sure how much pain that would bring just for the elimination
> of one more drm_i915_private, but that's how I picture the
> encapsulation.
> 

Would it be worth moving some of the flags in the device_info structure 
in a gt substructure, like we did for display, and get a pointer to that 
in intel_gt? We could save some jumps back that way and be more coherent 
in where we store the info.

Daniele

> I'm sure I'm missing a link or two :)
> -Chris
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