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drm/xe/pf: Add wait helper for VF FLR

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VF FLR requires additional processing done by PF driver.
The processing is done after FLR is already finished from PCIe
perspective.
In order to avoid a scenario where migration state transitions while
PF processing is still in progress, additional synchronization
point is needed.
Add a helper that will be used as part of VF driver struct
pci_error_handlers .reset_done() callback.

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251112132220.516975-24-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Michał Winiarski
2025-11-12 14:22:19 +01:00
parent 49cf1b9b60
commit 3b358c21f9
2 changed files with 25 additions and 0 deletions
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24
drivers/gpu/drm/xe/xe_sriov_pf_control.c
View File

@@ -123,6 +123,30 @@ int xe_sriov_pf_control_reset_vf(struct xe_device *xe, unsigned int vfid)
return result;
}
/**
* xe_sriov_pf_control_wait_flr() - Wait for a VF reset (FLR) to complete.
* @xe: the &xe_device
* @vfid: the VF identifier
*
* This function is for PF only.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_pf_control_wait_flr(struct xe_device *xe, unsigned int vfid)
{
struct xe_gt *gt;
unsigned int id;
int result = 0;
int err;
for_each_gt(gt, xe, id) {
err = xe_gt_sriov_pf_control_wait_flr(gt, vfid);
result = result ? -EUCLEAN : err;
}
return result;
}
/**
* xe_sriov_pf_control_sync_flr() - Synchronize a VF FLR between all GTs.
* @xe: the &xe_device

1
drivers/gpu/drm/xe/xe_sriov_pf_control.h
View File

@@ -12,6 +12,7 @@ int xe_sriov_pf_control_pause_vf(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_resume_vf(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_stop_vf(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_reset_vf(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_wait_flr(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_sync_flr(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_trigger_save_vf(struct xe_device *xe, unsigned int vfid);
int xe_sriov_pf_control_finish_save_vf(struct xe_device *xe, unsigned int vfid);