Index: sys/kern/subr_bus.c
===================================================================
--- sys/kern/subr_bus.c
+++ sys/kern/subr_bus.c
@@ -5730,6 +5730,7 @@
 	case DEV_RESCAN:
 	case DEV_DELETE:
 	case DEV_RESET:
+	case DEV_GET_PATH:
 		error = priv_check(td, PRIV_DRIVER);
 		if (error == 0)
 			error = find_device(req, &dev);
@@ -5963,6 +5964,40 @@
 		error = BUS_RESET_CHILD(device_get_parent(dev), dev,
 		    req->dr_flags);
 		break;
+	case DEV_GET_PATH: {
+		struct sbuf *sb;
+		char locator[64];
+		ssize_t len;
+
+		error = copyinstr(req->dr_buffer.buffer, locator, sizeof(locator), NULL);
+		if (error)
+			break;
+		printf("Please find path to %s using %s\n", device_get_nameunit(dev), locator);
+		sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
+		error = BUS_GET_DEVICE_PATH(device_get_parent(dev), dev,
+		    locator, sb);
+		printf("Error = %d\n", error);
+		sbuf_finish(sb);
+		if (error == 0) {
+			len = sbuf_len(sb);
+			if (len < 0) {
+				printf("no mem\n");
+				error = ENOMEM;
+			} else if (req->dr_buffer.length < len) {
+				printf("too short %zd vs %zd\n",
+				    req->dr_buffer.length, len);
+				req->dr_buffer.length = len;
+				error = ENAMETOOLONG;
+			} else {
+				req->dr_buffer.length = len;
+				printf("Found it! len = %zd, path = %s\n", len, sbuf_data(sb));
+				error = copyout(sbuf_data(sb),
+				    req->dr_buffer.buffer, len);
+			}
+		}
+		sbuf_delete(sb);
+		break;
+	}
 	}
 	mtx_unlock(&Giant);
 	return (error);
Index: sys/sys/bus.h
===================================================================
--- sys/sys/bus.h
+++ sys/sys/bus.h
@@ -130,6 +130,7 @@
 #define	DEV_FREEZE	_IOW('D', 11, struct devreq)
 #define	DEV_THAW	_IOW('D', 12, struct devreq)
 #define	DEV_RESET	_IOW('D', 13, struct devreq)
+#define	DEV_GET_PATH	_IOWR('D', 14, struct devreq)
 
 /* Flags for DEV_DETACH and DEV_DISABLE. */
 #define	DEVF_FORCE_DETACH	0x0000001