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diff --git a/sys/kern/bus_if.m b/sys/kern/bus_if.m
--- a/sys/kern/bus_if.m
+++ b/sys/kern/bus_if.m
@@ -945,3 +945,22 @@
void *_propvalue;
size_t _size;
} DEFAULT null_get_property;
+
+/**
+ * @brief Gets a child's full path to the device
+ *
+ * The get_device_path method retrieves a device's
+ * full path to the device using one of several
+ * locators present in the system.
+ *
+ * @param _bus the bus device
+ * @param _child the child device
+ * @param _locator locator name
+ * @param _sb buffer loaction string
+ */
+METHOD int get_device_path {
+ device_t _bus;
+ device_t _child;
+ const char *_locator;
+ struct sbuf *_sb;
+} DEFAULT bus_generic_get_device_path;
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
@@ -4627,6 +4627,41 @@
return (ENOENT);
}
+/**
+ * @brief Helper function to implement normal BUS_GET_DEVICE_PATH()
+ *
+ * This function knows how to (a) pass the request up the tree if there's
+ * a parent and (b) Knows how to supply a FreeBSD locator.
+ *
+ * @param bus bus in the walk up the tree
+ * @param child leaf node to print information about
+ * @param locator BUS_LOCATOR_xxx string for locator
+ * @param sb Buffer to print information into
+ */
+int
+bus_generic_get_device_path(device_t bus, device_t child, const char *locator,
+ struct sbuf *sb)
+{
+ int rv = 0;
+ device_t parent;
+
+ parent = device_get_parent(bus);
+ if (parent != NULL)
+ rv = BUS_GET_DEVICE_PATH(parent, bus, locator, sb);
+ if (strcmp(locator, BUS_LOCATOR_FREEBSD) == 0) {
+ if (rv == 0) {
+ sbuf_printf(sb, "/%s", device_get_nameunit(child));
+ }
+ return (rv);
+ }
+ /*
+ * Don't know what to do. So assume we do nothing. Not sure that's
+ * the right thing, but keeps us from having a big list here.
+ */
+ return (0);
+}
+
+
/**
* @brief Helper function for implementing BUS_RESCAN().
*
diff --git a/sys/sys/bus.h b/sys/sys/bus.h
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -491,6 +491,8 @@
struct resource_map *map);
int bus_generic_write_ivar(device_t dev, device_t child, int which,
uintptr_t value);
+int bus_generic_get_device_path(device_t bus, device_t child, const char *locator,
+ struct sbuf *sb);
int bus_helper_reset_post(device_t dev, int flags);
int bus_helper_reset_prepare(device_t dev, int flags);
int bus_null_rescan(device_t dev);
@@ -734,6 +736,8 @@
#define BUS_PASS_ORDER_LATE 7
#define BUS_PASS_ORDER_LAST 9
+#define BUS_LOCATOR_FREEBSD "FreeBSD"
+
extern int bus_current_pass;
void bus_set_pass(int pass);

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