vgsp: chan alloc/refusal diagnostics (PROMOTE_CTX probe benign); attribution: r958 windows were Xorg init; harness DISPLAY regression fixed; init window retires 2 consecutive cycles (SESSION 153 r962)

1 files changed, 20 insertions, 1 deletions

diff --git a/kernel/gsp_sema_service.c b/kernel/gsp_sema_service.c
index 6d2bee7..f15f1d2 100644
--- a/kernel/gsp_sema_service.c
+++ b/kernel/gsp_sema_service.c
@@ -1639,8 +1639,27 @@ void gsp_sema_service_channel_add(const struct sema_channel_desc *desc)
 	int i;
 
 	if (!desc || !desc->h_object || !desc->gpfifo_va ||
-	    desc->gpfifo_entries < 2)
+	    desc->gpfifo_entries < 2) {
+		/*
+		 * SESSION 153-CONTINUED-15 (draw attribution): a refused
+		 * channel registration used to be silent, so a real client
+		 * channel with an empty gpfifo VA looked identical to a
+		 * channel that was never allocated. Name every refusal.
+		 */
+		static u32 refuse_log;
+
+		if (refuse_log < 32) {
+			refuse_log++;
+			pr_info("sema-svc: chan add REFUSED h=0x%x gpfifo=0x%llx ent=%u eng=%u userd=0x%llx/%u\n",
+				desc ? desc->h_object : 0,
+				desc ? desc->gpfifo_va : 0,
+				desc ? desc->gpfifo_entries : 0,
+				desc ? desc->engine_type : 0,
+				desc ? desc->userd_pa : 0,
+				desc ? desc->userd_as : 0);
+		}
 		return;
+	}
 	if (!desc->engine_type) {
 		WRITE_ONCE(svc_gr_content_rearm, true);
 		svc_cepin_log = 0;