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Initial PMU port

Matthew Brost requested to merge mbrost/xe-kernel-driver-fix-missing-guc-firmware:pmu_port into xe

Quite a bit more work to do but have enough in this MR to start porting intel_gpu_top to Xe.

What is missing:

  • Implement GuC PMU backend to collect busyness
  • Properly read RC6 PMU values
  • Hook into runtime PM to short circuit a few functions
  • Settle on uAPI
  • Pull in other PMU stats present in DII but not in drm-tip

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