[PATCH v10 00/10] Introduce Xe PCIe FLR

Here's my humble attempt at introducing PCIe Function Level Reset (FLR)
support in xe driver. This is ofcourse a half baked implementation and
only limited to re-initializing GT. This needs to be extended for a lot
of components which are expected to be added as a follow up.

Detailed description in commit message and documentation.

PS: All xe_exec_basic tests and clpeak run smoothly after FLR. Give it
a spin and let me know if any regressions.

Trigger it with:

$ echo 1 > /sys/bus/pci/devices/<BDF>/reset

 v2: Re-initialize migrate context (Matthew Brost)
     Add kernel doc (Matthew Brost)
     Spell out Function Level Reset (Jani)

 v3: Cancel in-flight jobs before FLR

 v4: Teardown exec queues instead of mangling scheduler pending list (Matthew Brost)

 v5: Re-initialize kernel queues through submission backend (Matthew Brost)
     Prevent PM ref leak for wedged device (Matthew Brost)

 v6: Skip uC firmware selection during re-initialization (Daniele)
     Add IS_DGFX() and EXEC_QUEUE_FLAG_KERNEL asserts (Daniele)
     s/flr_done/reinit (Daniele)
     Repurpose system suspend/resume helpers for FLR (Daniele)
     Add PCIe FLR documentation (Daniele)

 v7: Refine PCIe FLR documentation (Daniele)
     Introduce xe_pci_reset_skip() helper (Lukasz)

 v8: Set fw state to XE_UC_FIRMWARE_INIT_FAIL on failure (Daniele)
     Introduce xe_sched_reinit() (Daniele)
     Maintain timeout per scheduler instance (Daniele)
     s/reinit/reinit_kernel (Daniele)

 v9: Move drm_sched_is_stopped() assert to xe_sched_reinit() (Daniele)
     Add negative asserts for GSC and PXP (Daniele)
     Provide xe_lrc_ctx_init() as regular function (Daniele)
     Redesign wedged state management to prevent races (Sashiko)
     Add 'Xe' prefix to document title (Rodrigo)

v10: Spell out temporary device wedging in subject (Lukasz)
     Update documentation to include PCI Error Handling (Lukasz)
     Maintain wedged reference on FLR failure (Lukasz)

Raag Jadav (10):
  drm/xe/uc_fw: Allow re-initializing firmware
  drm/xe/guc_submit: Introduce guc_exec_queue_reinit_kernel()
  drm/xe/gt: Introduce FLR helpers
  drm/xe/bo_evict: Introduce xe_bo_restore_map()
  drm/xe/exec_queue: Introduce xe_exec_queue_reinit()
  drm/xe/migrate: Introduce xe_migrate_reinit()
  drm/xe/pm: Introduce xe_device_suspend/resume()
  drm/xe: Introduce temporary device wedging
  drm/xe/pci: Introduce PCIe Function Level Reset
  drm/xe/doc: Wire up PCI Error Handling

 Documentation/gpu/xe/index.rst              |   1 +
 Documentation/gpu/xe/xe_pci_error.rst       |   8 +
 drivers/gpu/drm/xe/xe_bo_evict.c            |  51 +++-
 drivers/gpu/drm/xe/xe_bo_evict.h            |   2 +
 drivers/gpu/drm/xe/xe_device.c              | 256 ++++++++++++++++++--
 drivers/gpu/drm/xe/xe_device.h              |  10 +-
 drivers/gpu/drm/xe/xe_device_types.h        |  11 +-
 drivers/gpu/drm/xe/xe_exec_queue.c          |  47 +++-
 drivers/gpu/drm/xe/xe_exec_queue.h          |   1 +
 drivers/gpu/drm/xe/xe_exec_queue_types.h    |   2 +
 drivers/gpu/drm/xe/xe_execlist.c            |   6 +
 drivers/gpu/drm/xe/xe_gpu_scheduler.c       |  17 ++
 drivers/gpu/drm/xe/xe_gpu_scheduler.h       |   1 +
 drivers/gpu/drm/xe/xe_gpu_scheduler_types.h |   5 +
 drivers/gpu/drm/xe/xe_gsc.c                 |  14 ++
 drivers/gpu/drm/xe/xe_gsc.h                 |   1 +
 drivers/gpu/drm/xe/xe_gt.c                  |  33 +++
 drivers/gpu/drm/xe/xe_gt.h                  |   2 +
 drivers/gpu/drm/xe/xe_guc.c                 |  29 +++
 drivers/gpu/drm/xe/xe_guc.h                 |   2 +
 drivers/gpu/drm/xe/xe_guc_submit.c          |   9 +
 drivers/gpu/drm/xe/xe_huc.c                 |  14 ++
 drivers/gpu/drm/xe/xe_huc.h                 |   1 +
 drivers/gpu/drm/xe/xe_lrc.c                 |  15 +-
 drivers/gpu/drm/xe/xe_lrc.h                 |   2 +
 drivers/gpu/drm/xe/xe_migrate.c             |  12 +
 drivers/gpu/drm/xe/xe_migrate.h             |   1 +
 drivers/gpu/drm/xe/xe_pci.c                 |   1 +
 drivers/gpu/drm/xe/xe_pci_error.c           | 138 ++++++++++-
 drivers/gpu/drm/xe/xe_pm.c                  | 103 +-------
 drivers/gpu/drm/xe/xe_uc.c                  |  73 ++++++
 drivers/gpu/drm/xe/xe_uc.h                  |   2 +
 drivers/gpu/drm/xe/xe_uc_fw.c               |  67 +++++
 drivers/gpu/drm/xe/xe_uc_fw.h               |   1 +
 drivers/gpu/drm/xe/xe_uc_types.h            |  14 ++
 35 files changed, 806 insertions(+), 146 deletions(-)
 create mode 100644 Documentation/gpu/xe/xe_pci_error.rst

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2.43.0