[Intel-gfx] [PATCH v4 1/6] drm/i915/pxp: Make gt and pxp init/fini aware of PXP-owning-GT

[Teres Alexis, Alan Previn]

typo correction...

On Tue, 2022-11-22 at 12:13 -0800, Alan Previn Teres Alexis wrote:
> After a more comprehensive offline discussion with Daniele and Rodrigo, design direction was made to go with Option2
> where we elevate pxp to a global subsystem and within it it establish a pointer to the correct gt for pxp-controls. This
> also reflects the current HW architectures where the PXP feature (when viewed as a service for contexts and buffers) is
> global to all subsystems including any workload on any tile, despite its single control-knobs being only in the media
> tile (because PXP controls needs to be global to the GPU to avoid any races).
> 
> This would mean we move 'struct intel_pxp' to be under i915 so that all subsystems that need to call into PXP would now
> pass in i915 as its parameter. PXP internally would have a pointer to the correct GT (media-tile for MTL and gt0 for
typo: "pass in i915->pxp as its parameter"
> prior).
> 
> It would also mean that certain code will still look a little kludgy or needs attention:
>  - power-related operations like init/fini and suspend/resume would now need to called either before or after all-gt
> equivalents to ensure proper flow.
>  - KCR IRQ will although being a gt level IRQ will now require passing i915 into the pxp subsystem.
> 
> *NOTE: above list, even if i missed any, would still be nowhere near the amount of other external facing interfaces that
> would be called by global subsystems that would now look clean with i915->pxp as its param.
> 
> ...alan