drm/xe/vf: Stop applying save-restore MMIOs if VF

Currently we are blocking processing of all save-restore rules
by the VFs inside the xe_rtp_process_to_sr() function, but we
want to unblock that to allow processing of the LRC WA rules.

To avoid hitting WARNs about reading an inaccessible registers by
the VFs, stop applying save-restore MMIOs action if VF, without
relying that SR list will be always empty for the VF.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250303173522.1822-5-michal.wajdeczko@intel.com

diff --git a/drivers/gpu/drm/xe/xe_reg_sr.c b/drivers/gpu/drm/xe/xe_reg_sr.c
index 9475e3f749580c01904a1fa0b23e0010f42cce90..fc8447a838c4f98eeca7cd6f33d76d8222389cde 100644 (file)
--- a/drivers/gpu/drm/xe/xe_reg_sr.c
+++ b/drivers/gpu/drm/xe/xe_reg_sr.c
@@ -173,6 +173,9 @@ void xe_reg_sr_apply_mmio(struct xe_reg_sr *sr, struct xe_gt *gt)
        if (xa_empty(&sr->xa))
                return;
 
+       if (IS_SRIOV_VF(gt_to_xe(gt)))
+               return;
+
        xe_gt_dbg(gt, "Applying %s save-restore MMIOs\n", sr->name);
 
        fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);