drm/xe/vf: Custom GT restart

Only few steps from the GT restart phase are applicable for the
VF drivers, as initialization of PAT, WOPCM, MOCS or CCS mode can
be done only by the native or PF drivers. Use custom GT restart
function if running in VF mode.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240604212231.1416-5-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_gt.c

@@ -611,12 +611,34 @@ static int do_gt_reset(struct xe_gt *gt)
 	return err;
 }
 
+static int vf_gt_restart(struct xe_gt *gt)
+{
+	int err;
+
+	err = xe_uc_sanitize_reset(&gt->uc);
+	if (err)
+		return err;
+
+	err = xe_uc_init_hw(&gt->uc);
+	if (err)
+		return err;
+
+	err = xe_uc_start(&gt->uc);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static int do_gt_restart(struct xe_gt *gt)
 {
 	struct xe_hw_engine *hwe;
 	enum xe_hw_engine_id id;
 	int err;
 
+	if (IS_SRIOV_VF(gt_to_xe(gt)))
+		return vf_gt_restart(gt);
+
 	xe_pat_init(gt);
 
 	xe_gt_mcr_set_implicit_defaults(gt);