I915 DG1/LMEM RFC Section

Upstream plan

For upstream the overall plan for landing all the DG1 stuff and turning it for real, with all the uAPI bits is:

  • Merge basic HW enabling of DG1(still without pciid)
  • Merge the uAPI bits behind special CONFIG_BROKEN(or so) flag
    • At this point we can still make changes, but importantly this lets us start running IGTs which can utilize local-memory in CI
  • Convert over to TTM, make sure it all keeps working. Some of the work items:
    • TTM shrinker for discrete
    • dma_resv_lockitem for full dma_resv_lock, i.e not just trylock
    • Use TTM CPU pagefault handler
    • Route shmem backend over to TTM SYSTEM for discrete
    • TTM purgeable object support
    • Move i915 buddy allocator over to TTM
  • Send RFC(with mesa-dev on cc) for final sign off on the uAPI
  • Add pciid for DG1 and turn on uAPI for real