[PATCH] drm/xe/vf: Skip attempt to start GuC PC if VF

[Michal Wajdeczko]

We have already marked the GuC PC feature as not applicable for
VF devices, but we missed the fact that there may be still some
privileged activities performed by this component, who does much
more than its name suggests.

Explicitly skip xe_guc_pc_start() if running as a VF driver and
use a GT oriented message to report any error.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_guc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
index 172b65a50e31..79931466e479 100644
--- a/drivers/gpu/drm/xe/xe_guc.c
+++ b/drivers/gpu/drm/xe/xe_guc.c
@@ -1125,10 +1125,13 @@ void xe_guc_stop(struct xe_guc *guc)
 
 int xe_guc_start(struct xe_guc *guc)
 {
-	int ret;
+	if (!IS_SRIOV_VF(guc_to_xe(guc))) {
+		int err;
 
-	ret = xe_guc_pc_start(&guc->pc);
-	XE_WARN_ON(ret);
+		err = xe_guc_pc_start(&guc->pc);
+		xe_gt_WARN(guc_to_gt(guc), err, "Failed to start GuC PC: %pe\n",
+			   ERR_PTR(err));
+	}
 
 	return xe_guc_submit_start(guc);
 }
-- 
2.43.0