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diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -5764,6 +5764,29 @@
bus_data_generation_update();
}
+static char *
+device_get_path(device_t dev, const char *locator)
+{
+ struct sbuf *sb;
+ ssize_t len;
+ char *rv = NULL;
+ 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); /* Note: errors checked with sbuf_len() below */
+ if (error != 0)
+ goto out;
+ len = sbuf_len(sb);
+ if (len <= 1)
+ goto out;
+ rv = malloc(len, M_BUS, M_NOWAIT);
+ memcpy(rv, 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)
@@ -5795,6 +5818,9 @@
case DEV_THAW:
error = priv_check(td, PRIV_DRIVER);
break;
+ case DEV_GET_PATH:
+ error = find_device(req, &dev);
+ break;
default:
error = ENOTTY;
break;
@@ -6020,6 +6046,29 @@
error = BUS_RESET_CHILD(device_get_parent(dev), dev,
req->dr_flags);
break;
+ case DEV_GET_PATH: {
+ char locator[64];
+ 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(path, M_BUS);
+ break;
+ }
}
bus_topo_unlock();
return (error);
diff --git a/sys/sys/bus.h b/sys/sys/bus.h
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -129,6 +129,7 @@
#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

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