[PATCH v6 0/8] Introduce Xe PCIe FLR

Raag Jadav
2026-04-23T10:03:17Z

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 flow for FLR (Daniele)

Raag Jadav (8):
drm/xe/uc_fw: Allow re-initializing firmware
drm/xe/guc_submit: Introduce guc_exec_queue_reinit()
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/pci: Introduce PCIe FLR

drivers/gpu/drm/xe/Makefile | 1 +
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 | 150 +++++++++++++++++++++++
drivers/gpu/drm/xe/xe_device.h | 2 +
drivers/gpu/drm/xe/xe_device_types.h | 3 +
drivers/gpu/drm/xe/xe_exec_queue.c | 42 ++++++-
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.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 | 48 ++++++++
drivers/gpu/drm/xe/xe_gt.h | 2 +
drivers/gpu/drm/xe/xe_gt_types.h | 9 ++
drivers/gpu/drm/xe/xe_guc.c | 29 +++++
drivers/gpu/drm/xe/xe_guc.h | 2 +
drivers/gpu/drm/xe/xe_guc_submit.c | 11 ++
drivers/gpu/drm/xe/xe_huc.c | 14 +++
drivers/gpu/drm/xe/xe_huc.h | 1 +
drivers/gpu/drm/xe/xe_lrc.c | 17 +++
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.h | 2 +
drivers/gpu/drm/xe/xe_pci_error.c | 113 +++++++++++++++++
drivers/gpu/drm/xe/xe_pm.c | 103 ++--------------
drivers/gpu/drm/xe/xe_uc.c | 39 ++++++
drivers/gpu/drm/xe/xe_uc.h | 2 +
drivers/gpu/drm/xe/xe_uc_fw.c | 49 ++++++++
drivers/gpu/drm/xe/xe_uc_fw.h | 1 +
33 files changed, 631 insertions(+), 107 deletions(-)
create mode 100644 drivers/gpu/drm/xe/xe_pci_error.c

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2.43.0