[PATCH v5 0/6] Fix serialization on burst of unbinds - v2

[Matthew Brost <matthew.brost@intel.com>]

Attempting to resolve part of [1]; this solution differs than v1 [2] 
by changing last fence semantics detailed in the patches.

Overview of issue in [1]:

When a burst of unbind jobs is issued, a dependency chain can form 
between the TLB invalidation of a previous unbind job and the current 
one. This leads to undesirable serialization, causing current jobs to 
wait unnecessarily for prior TLB invalidations, execute on the GPU 
when not needed, and significantly slow down the unbind 
burst—resulting in up to a 4× slowdown.
 
Matt

[1] https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6047
[2] https://patchwork.freedesktop.org/series/156144/

Matthew Brost (6):
  drm/xe: Enforce correct user fence signaling order using drm_syncobjs
  drm/xe: Attach last fence to TLB invalidation job queues
  drm/xe: Decouple bind queue last fence from TLB invalidations
  drm/xe: Skip TLB invalidation waits in page fault binds
  drm/xe: Disallow input fences on zero batch execs and zero binds
  drm/xe: Remove last fence dependency check from binds

 drivers/gpu/drm/xe/xe_exec.c             |   3 +-
 drivers/gpu/drm/xe/xe_exec_queue.c       | 119 ++++++++++++++++++++---
 drivers/gpu/drm/xe/xe_exec_queue.h       |  23 ++++-
 drivers/gpu/drm/xe/xe_exec_queue_types.h |  12 +++
 drivers/gpu/drm/xe/xe_migrate.c          |  14 +++
 drivers/gpu/drm/xe/xe_migrate.h          |   8 ++
 drivers/gpu/drm/xe/xe_oa.c               |  45 ++++++---
 drivers/gpu/drm/xe/xe_oa_types.h         |   8 ++
 drivers/gpu/drm/xe/xe_pt.c               |  80 +++++----------
 drivers/gpu/drm/xe/xe_sync.c             |  91 ++++++++++-------
 drivers/gpu/drm/xe/xe_sync.h             |   3 +
 drivers/gpu/drm/xe/xe_sync_types.h       |   3 +
 drivers/gpu/drm/xe/xe_tlb_inval_job.c    |  31 ++++--
 drivers/gpu/drm/xe/xe_tlb_inval_job.h    |   5 +-
 drivers/gpu/drm/xe/xe_vm.c               |  97 ++++++++++--------
 drivers/gpu/drm/xe/xe_vm_types.h         |   6 +-
 16 files changed, 376 insertions(+), 172 deletions(-)

-- 
2.34.1