Commit 3b358c21 authored by Michał Winiarski's avatar Michał Winiarski
Browse files

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



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: default avatarMichal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251112132220.516975-24-michal.winiarski@intel.com


Signed-off-by: default avatarMichał Winiarski <michal.winiarski@intel.com>
parent 49cf1b9b

drivers/gpu/drm/xe/xe_sriov_pf_control.c

+24 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpu/drm/xe/xe_sriov_pf_control.h

+1 −0
Original line number Diff line number Diff line
@@ -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);