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drm/xe/pm: Assert on runtime suspend if VFs are enabled

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We hold an additional reference to the runtime PM to keep PF in D0
during VFs lifetime, as our VFs do not implement the PM capability.
This means we should never be runtime suspending as long as VFs are
enabled.

v8: Add !IS_SRIOV_VF() assert (Matthew Brost)

Suggested-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patch.msgid.link/20251030122357.128825-4-raag.jadav@intel.com
This commit is contained in:
Raag Jadav 2025-10-30 17:53:56 +05:30 committed by Ashutosh Dixit
parent 726ceb5716
commit e6d2fe31a7
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/xe/xe_pci.c
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@ -1160,6 +1160,15 @@ static int xe_pci_runtime_suspend(struct device *dev)
struct xe_device *xe = pdev_to_xe_device(pdev);
int err;
/*
* We hold an additional reference to the runtime PM to keep PF in D0
* during VFs lifetime, as our VFs do not implement the PM capability.
* This means we should never be runtime suspending as long as VFs are
* enabled.
*/
xe_assert(xe, !IS_SRIOV_VF(xe));
xe_assert(xe, !pci_num_vf(pdev));
err = xe_pm_runtime_suspend(xe);
if (err)
return err;