[PATCH 6.12 0/4] drm/xe: Fix xe_force_wake_get return handling

[Tomita Moeko]

This patchset fixes the xe driver probe fail with -ETIMEDOUT issue in
linux 6.12.35 and later version. The failure is caused by commit
d42b44736ea2 ("drm/xe/gt: Update handling of xe_force_wake_get return"),
which  incorrectly handles the return value of xe_force_wake_get as
"refcounted domain mask" (as introduced in 6.13), rather than status
code (as used in 6.12).

In 6.12 stable kernel, xe_force_wake_get still returns a status code.
The update incorrectly treats the return value as a mask, causing the
return value of 0 to be misinterpreted as an error. As a result, the
driver probe fails with -ETIMEDOUT in xe_pci_probe -> xe_device_probe
-> xe_gt_init_hwconfig -> xe_force_wake_get.

[ 1254.323172] xe 0000:00:02.0: [drm] Found ALDERLAKE_P (device ID 46a6) display version 13.00 stepping D0
[ 1254.323175] xe 0000:00:02.0: [drm:xe_pci_probe [xe]] ALDERLAKE_P  46a6:000c dgfx:0 gfx:Xe_LP (12.00) media:Xe_M (12.00) display:yes dma_m_s:39 tc:1 gscfi:0 cscfi:0
[ 1254.323275] xe 0000:00:02.0: [drm:xe_pci_probe [xe]] Stepping = (G:C0, M:C0, B:**)
[ 1254.323328] xe 0000:00:02.0: [drm:xe_pci_probe [xe]] SR-IOV support: no (mode: none)
[ 1254.323379] xe 0000:00:02.0: [drm:intel_pch_type [xe]] Found Alder Lake PCH
[ 1254.323475] xe 0000:00:02.0: probe with driver xe failed with error -110

Similar return handling issue cause by API mismatch are also found in:
Commit 95a75ed2b005 ("drm/xe/tests/mocs: Update xe_force_wake_get() return handling")
Commit 9ffd6ec2de08 ("drm/xe/devcoredump: Update handling of xe_force_wake_get return")

This patchset fixes them by reverting them all.

Additionally, commit deb05f8431f3 ("drm/xe/forcewake: Add a helper
xe_force_wake_ref_has_domain()") is also reverted as it is not needed in
6.12.


Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5373
Cc: Badal Nilawar <badal.nilawar at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
Cc: Nirmoy Das <nirmoy.das at intel.com>


Tomita Moeko (4):
  Revert "drm/xe/gt: Update handling of xe_force_wake_get return"
  Revert "drm/xe/tests/mocs: Update xe_force_wake_get() return handling"
  Revert "drm/xe/devcoredump: Update handling of xe_force_wake_get
    return"
  Revert "drm/xe/forcewake: Add a helper xe_force_wake_ref_has_domain()"

 drivers/gpu/drm/xe/tests/xe_mocs.c  |  21 +++---
 drivers/gpu/drm/xe/xe_devcoredump.c |  14 ++--
 drivers/gpu/drm/xe/xe_force_wake.h  |  16 -----
 drivers/gpu/drm/xe/xe_gt.c          | 105 +++++++++++++---------------
 4 files changed, 63 insertions(+), 93 deletions(-)

-- 
2.47.2