[PATCH 4/5] drm/xe/vf: Stop applying save-restore MMIOs if VF

[Michal Wajdeczko]

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 at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/xe/xe_reg_sr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_reg_sr.c b/drivers/gpu/drm/xe/xe_reg_sr.c
index 9475e3f74958..fc8447a838c4 100644
--- 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);
-- 
2.47.1