[PATCH 0/6] Use DRM scheduler for delayed GT TLB invalidations

[Matthew Brost]

Use the DRM scheduler for delayed GT TLB invalidations, which properly
fixes the issue raised in [1]. GT TLB fences have their own dma-fence
context, so even if the invalidations are ordered, the dma-resv/DRM
scheduler cannot squash the fences. This results in O(M*N*N) complexity
in the garbage collector, where M is the number of ranges in the garbage
collector and N is the number of pending GT TLB invalidations.

Admittedly, it's quite a lot of code, but the series includes extensive
kernel documentation and clear code comments. It introduces a generic
dependency scheduler that can be reused in the future and is logically
much cleaner than the previous open-coded solution for delaying GT TLB
invalidations until a bind job completes.

Matt

[1] https://patchwork.freedesktop.org/patch/658370/?series=150188&rev=1

Matthew Brost (6):
  drm/xe: Explicitly mark migration queues with flag
  drm/xe: Add generic dependecy jobs / scheduler
  drm/xe: Add dependency scheduler for GT TLB invalidations to bind
    queues
  drm/xe: Add xe_migrate_job_lock/unlock helpers
  drm/xe: Add GT TLB invalidation jobs
  drm/xe: Use GT TLB invalidation jobs in PT layer

 drivers/gpu/drm/xe/Makefile              |   2 +
 drivers/gpu/drm/xe/xe_dep_job_types.h    |  29 +++
 drivers/gpu/drm/xe/xe_dep_scheduler.c    | 145 ++++++++++++
 drivers/gpu/drm/xe/xe_dep_scheduler.h    |  21 ++
 drivers/gpu/drm/xe/xe_exec_queue.c       |  24 ++
 drivers/gpu/drm/xe/xe_exec_queue_types.h |  15 ++
 drivers/gpu/drm/xe/xe_gt_tlb_inval_job.c | 274 +++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_gt_tlb_inval_job.h |  34 +++
 drivers/gpu/drm/xe/xe_migrate.c          |  44 +++-
 drivers/gpu/drm/xe/xe_migrate.h          |  13 ++
 drivers/gpu/drm/xe/xe_pt.c               | 193 +++++++---------
 11 files changed, 678 insertions(+), 116 deletions(-)
 create mode 100644 drivers/gpu/drm/xe/xe_dep_job_types.h
 create mode 100644 drivers/gpu/drm/xe/xe_dep_scheduler.c
 create mode 100644 drivers/gpu/drm/xe/xe_dep_scheduler.h
 create mode 100644 drivers/gpu/drm/xe/xe_gt_tlb_inval_job.c
 create mode 100644 drivers/gpu/drm/xe/xe_gt_tlb_inval_job.h

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2.34.1