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RFC: initial GPUVA port in Xe

Matthew Brost requested to merge (removed):xe into xe

Based on @dakr GPUVA series on the list: https://patchwork.freedesktop.org/series/112994/

Update Xe structures xe_vm & xe_vma to inherit from GPUVA structures, use GPUVA to track VMAs within a VM, and use GPUVA to track VMAs attached to GEMs.

More needs to be be done but posting for initial feedback.

In particular follow on work / issues:

  • Need to update bind operations to use GPUVA to generate operations
  • Need to update GPUVA to not depend on drm_mm
  • Need to settle on if regions are needed, my thinking is they are not
  • Perhaps change the locking around drm_gpuva_link_*, my thinking is the caller should own the lock

Will continue working on this port + respond on the list with my concerns.

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