[Intel-gfx] [PATCH] drm/i915/mtl: Media GT and Render GT share common GGTT

[Iddamsetty, Aravind]

On 31-10-2022 23:16, Matt Roper wrote:
> On Mon, Oct 31, 2022 at 06:01:11PM +0530, Aravind Iddamsetty wrote:
>> On XE_LPM+ platforms the media engines are carved out into a separate
>> GT but have a common GGTMMADR address range which essentially makes
>> the GGTT address space to be shared between media and render GT.
> 

<snip>
>>  
>>  int intel_gt_init_mmio(struct intel_gt *gt)
>> @@ -965,6 +973,9 @@ int intel_gt_tiles_init(struct drm_i915_private *i915)
>>  	int ret;
>>  
>>  	for_each_gt(gt, i915, id) {
>> +		if (GRAPHICS_VER(i915) >= 8)
>> +			setup_private_pat(gt);
>> +
> 
> Since the term "tile" is used for PVC-style remote tiles (which we have
> some framework for, but haven't enabled yet), it seems confusing to have
> the PAT setup for all GTs (including the standalone media GT) in a
> function called intel_gt_tiles_init().  Maybe we should also have a prep
> patch that renames this function if we're going to start doing non-tile
> things in here too?

But isn't GT and Tile used interchangeably. Also, Could you please
elaborate what do you mean by non tile related things here and as i
understand PAT are per GT registers and in case of SA Media the
gsi_offset get added.
> 
>>  		ret = intel_gt_probe_lmem(gt);
>>  		if (ret)
>>  			return ret;
<snip>

Thanks,
Aravind.