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RFC: Initial work to ensure we wake up the right IP blocks for mmio operations.

Rodrigo Vivi requested to merge rodrigovivi/drm-xe:xe_mmio_forcewake into xe

The next steps here are:

  • introduce the domains and make the mmio operation to wake only the specific domain
  • check if there are places where we currently use a global forcewake that could be avoided now that we have the mmio protected
  • document the forcewake
  • get rid of other i915_utils.h usages

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