Index: head/sys/dev/pci/pci.c
===================================================================
--- head/sys/dev/pci/pci.c
+++ head/sys/dev/pci/pci.c
@@ -5427,7 +5427,8 @@
     size_t buflen)
 {
 
-	snprintf(buf, buflen, "pci%d:%d:%d:%d", pci_get_domain(child),
+	snprintf(buf, buflen, "slot=%d function=%d dbsf=pci%d:%d:%d:%d",
+	    pci_get_slot(child), pci_get_function(child), pci_get_domain(child),
 	    pci_get_bus(child), pci_get_slot(child), pci_get_function(child));
 	return (0);
 }