nubus: implement BusClass get_dev_path()

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210924073808.1041-7-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/nubus/nubus-bus.c

@@ -96,6 +96,21 @@ static void nubus_init(Object *obj)
                                                  NUBUS_SLOT_NB);
 }
 
+static char *nubus_get_dev_path(DeviceState *dev)
+{
+    NubusDevice *nd = NUBUS_DEVICE(dev);
+    BusState *bus = qdev_get_parent_bus(dev);
+    char *p = qdev_get_dev_path(bus->parent);
+
+    if (p) {
+        char *ret = g_strdup_printf("%s/%s/%02x", p, bus->name, nd->slot);
+        g_free(p);
+        return ret;
+    } else {
+        return g_strdup_printf("%s/%02x", bus->name, nd->slot);
+    }
+}
+
 static bool nubus_check_address(BusState *bus, DeviceState *dev, Error **errp)
 {
     NubusDevice *nd = NUBUS_DEVICE(dev);
@@ -130,6 +145,7 @@ static void nubus_class_init(ObjectClass *oc, void *data)
 
     bc->realize = nubus_realize;
     bc->check_address = nubus_check_address;
+    bc->get_dev_path = nubus_get_dev_path;
 }
 
 static const TypeInfo nubus_bus_info = {