Index: sys/kern/subr_bus.c
===================================================================
--- sys/kern/subr_bus.c
+++ sys/kern/subr_bus.c
@@ -5707,6 +5707,30 @@
 	bus_data_generation_update();
 }
 
+static const char *
+device_get_path(device_t dev, const char *locator)
+{
+	struct sbuf *sb;
+	ssize_t len;
+	const char *rv = NULL;
+	char *r;
+	int error;
+
+	sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
+	error = BUS_GET_DEVICE_PATH(device_get_parent(dev), dev, locator, sb);
+	sbuf_finish(sb);
+	if (error != 0)
+		goto out;
+	len = sbuf_len(sb);
+	if (len <= 1)
+		goto out;
+	rv = r = malloc(len, M_BUS, M_NOWAIT);
+	memcpy(r, sbuf_data(sb), len);
+out:
+	sbuf_delete(sb);
+	return rv;
+}
+
 static int
 devctl2_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
     struct thread *td)
@@ -5730,6 +5754,7 @@
 	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 +5988,29 @@
 		error = BUS_RESET_CHILD(device_get_parent(dev), dev,
 		    req->dr_flags);
 		break;
+	case DEV_GET_PATH: {
+		char locator[64];
+		const char *path;
+		ssize_t len;
+
+		error = copyinstr(req->dr_buffer.buffer, locator, sizeof(locator), NULL);
+		if (error)
+			break;
+		path = device_get_path(dev, locator);
+		if (path == NULL) {
+			error = ENOMEM;
+			break;
+		}
+		len = strlen(path) + 1;
+		if (req->dr_buffer.length < len) {
+			error = ENAMETOOLONG;
+		} else {
+			error = copyout(path, req->dr_buffer.buffer, len);
+		}
+		req->dr_buffer.length = len;
+		free(__DECONST(void *, path), M_BUS);
+		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