[PATCH 00/11] Pagefault refactor, fine grained fault locking, threaded prefetch

[Matthew Brost]

We likely need multiple page fault producers feeding into a common
consumer backend. Additionally, our current page fault work queue
design—being per-GT rather than per-device—makes little sense. Clean
this up ahead of upcoming changes that introduce fine-grained fault
locking and threaded prefetching.

Fine-grained fault locking provides immediate benefits: it allows page
faults from the same VM to be processed in parallel (unless they target
the same range) and enables a sane multi-threaded prefetch
implementation. Longer term, it should help transition GPU SVM from a
per-VM model to a per-MM model, which scales better across multiple VMs
or devices.

Lastly, threaded prefetching enables efficient usage of copy engines.

Matt   

Matthew Brost (11):
  drm/xe: Stub out new pagefault layer
  drm/xe: Implement xe_pagefault_init
  drm/xe: Implement xe_pagefault_reset
  drm/xe: Implement xe_pagefault_handler
  drm/xe: Implement xe_pagefault_queue_work
  drm/xe: Add xe_guc_pagefault layer
  drm/xe: Remove unused GT page fault code
  drm/xe: Fine grained page fault locking
  drm/xe: Allow prefetch-only VM bind IOCTLs to use VM read lock
  drm/xe: Thread prefetch of SVM ranges
  drm/xe: Add num_pf_queue modparam

 drivers/gpu/drm/xe/Makefile             |   3 +-
 drivers/gpu/drm/xe/xe_device.c          |  20 +-
 drivers/gpu/drm/xe/xe_device_types.h    |  10 +
 drivers/gpu/drm/xe/xe_gt.c              |   8 +-
 drivers/gpu/drm/xe/xe_gt_pagefault.c    | 691 ------------------------
 drivers/gpu/drm/xe/xe_gt_pagefault.h    |  19 -
 drivers/gpu/drm/xe/xe_gt_types.h        |  65 ---
 drivers/gpu/drm/xe/xe_guc_ct.c          |   6 +-
 drivers/gpu/drm/xe/xe_guc_pagefault.c   |  94 ++++
 drivers/gpu/drm/xe/xe_guc_pagefault.h   |  13 +
 drivers/gpu/drm/xe/xe_hmm.c             |   4 +-
 drivers/gpu/drm/xe/xe_module.c          |   5 +
 drivers/gpu/drm/xe/xe_module.h          |   1 +
 drivers/gpu/drm/xe/xe_pagefault.c       | 480 ++++++++++++++++
 drivers/gpu/drm/xe/xe_pagefault.h       |  19 +
 drivers/gpu/drm/xe/xe_pagefault_types.h | 125 +++++
 drivers/gpu/drm/xe/xe_svm.c             | 114 ++--
 drivers/gpu/drm/xe/xe_svm.h             |  38 ++
 drivers/gpu/drm/xe/xe_vm.c              | 261 +++++++--
 drivers/gpu/drm/xe/xe_vm.h              |   2 +
 drivers/gpu/drm/xe/xe_vm_types.h        |  28 +-
 21 files changed, 1131 insertions(+), 875 deletions(-)
 delete mode 100644 drivers/gpu/drm/xe/xe_gt_pagefault.c
 delete mode 100644 drivers/gpu/drm/xe/xe_gt_pagefault.h
 create mode 100644 drivers/gpu/drm/xe/xe_guc_pagefault.c
 create mode 100644 drivers/gpu/drm/xe/xe_guc_pagefault.h
 create mode 100644 drivers/gpu/drm/xe/xe_pagefault.c
 create mode 100644 drivers/gpu/drm/xe/xe_pagefault.h
 create mode 100644 drivers/gpu/drm/xe/xe_pagefault_types.h

-- 
2.34.1