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* [PATCH v11 0/3] Introduce cold reset recovery method
@ 2026-07-20 10:18 Mallesh Koujalagi
  2026-07-20 10:18 ` [PATCH v11 1/3] drm: Add DRM_WEDGE_RECOVERY_COLD_RESET " Mallesh Koujalagi
                   ` (5 more replies)
  0 siblings, 6 replies; 10+ messages in thread
From: Mallesh Koujalagi @ 2026-07-20 10:18 UTC (permalink / raw)
  To: intel-xe, dri-devel, rodrigo.vivi
  Cc: andrealmeid, christian.koenig, airlied, simona.vetter, mripard,
	maarten.lankhorst, tzimmermann, anshuman.gupta, badal.nilawar,
	riana.tauro, karthik.poosa, sk.anirban, raag.jadav,
	Mallesh Koujalagi

Add support for handling errors that require a complete
device power cycle (cold reset) to recover.

Certain error conditions leave the device in a persistent hardware
error state that cannot be cleared through existing recovery mechanisms
such as driver reload or PCIe reset. In these cases, functionality can
only be restored by performing a cold reset.

To support this, the series introduces a new DRM wedging recovery
method, DRM_WEDGE_RECOVERY_COLD_RESET (BIT(4)). When a device is wedged
with this method, the DRM core notifies userspace via a uevent that a cold
reset is required. This allows userspace to take appropriate action to
power-cycle the device.

Example uevent received:
  SUBSYSTEM=drm
  WEDGED=cold-reset
  DEVPATH=/devices/.../drm/card0

v2:
- Add use case: Handling errors from power management unit,
  which requires a complete power cycle to
  recover. (Christian)
- Add several instead of number to avoid update. (Jani)

v3:
- Update any scenario that requires cold-reset. (Riana)
- Update document with generic scenario. (Riana)
- Consistent with terminology. (Raag)
- Remove already covered information.
- Use PUNIT instead of PMU. (Riana)
- Use consistent wordingi.
- Remove log. (Raag)

v4:
- Rename cold reset to power cyclce. (Raag)
- Update doc. (Raag/Riana)
- Change commit message. (Raag)
- Make function static. (Raag)

v5:
- Make it consistent with consumer expectations. (Raag)
- Update commit message.
- Remove unbind.
- Simplify cold-reset script.
- Remove kdoc for static function.
- Remove xe_ prefix for static function.

v6:
- Drop "last resort" wording. (Riana)
- Look up the hotplug slot in DEVPATH instead of scanning
  every PCI slot on the system. (Raag)
- Drop arbitrary sleep values from the example script.
- Expand commit message to explain why SUR_DN is masked. (Raag/Riana)
- Check Slot Implemented bit before reading Slot Capabilities, per
  PCIe spec. (Riana)
- Add debug log.

v7:
- Update recovery script. (Raag)
- Handle surprise link down event properly. (Aravind/Riana)
- Update commit message. (Riana)
- Correct log message.

v8:
- Add rescan instead of reset. (Raag)
- Use find_usp_dev() in punit_error_handler() function.

v9:
- Remove unwanted header. (Sashiko)
- Removed #ifdef CONFIG_PCIEAER. (Riana)
- Used pci_find_ext_capability() instead of usp->aer_cap.
- Clear the PCI_ERR_UNC_SURPDN status bit (W1C) after
  reset complete. (Lukas Wunner)
- Use pci_clear_and_set_config_dword() helper.

v10:
- Rebase.
- Fix column width. (Sashiko)

v11:
- Make udev rules in single line. (Sashiko)

Cc: André Almeida <andrealmeid@igalia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>

Mallesh Koujalagi (3):
  drm: Add DRM_WEDGE_RECOVERY_COLD_RESET recovery method
  drm/doc: Document DRM_WEDGE_RECOVERY_COLD_RESET recovery method
  drm/xe: Handle PUNIT errors by requesting cold-reset recovery

 Documentation/gpu/drm-uapi.rst | 93 ++++++++++++++++++++++++++++++++--
 drivers/gpu/drm/drm_drv.c      |  2 +
 drivers/gpu/drm/xe/xe_ras.c    |  8 ++-
 include/drm/drm_device.h       |  1 +
 4 files changed, 98 insertions(+), 6 deletions(-)

-- 
2.48.1


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2026-07-21 17:38 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-07-20 10:18 [PATCH v11 0/3] Introduce cold reset recovery method Mallesh Koujalagi
2026-07-20 10:18 ` [PATCH v11 1/3] drm: Add DRM_WEDGE_RECOVERY_COLD_RESET " Mallesh Koujalagi
2026-07-20 10:30   ` sashiko-bot
2026-07-20 10:18 ` [PATCH v11 2/3] drm/doc: Document " Mallesh Koujalagi
2026-07-20 10:18 ` [PATCH v11 3/3] drm/xe: Handle PUNIT errors by requesting cold-reset recovery Mallesh Koujalagi
2026-07-20 10:48   ` sashiko-bot
2026-07-21 17:37     ` Rodrigo Vivi
2026-07-20 14:30 ` ✓ CI.KUnit: success for Introduce cold reset recovery method (rev11) Patchwork
2026-07-20 15:05 ` ✓ Xe.CI.BAT: " Patchwork
2026-07-20 19:09 ` ✗ Xe.CI.FULL: failure " Patchwork

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