qdev: add qbus_reset_all

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/qdev-core.h

@@ -182,6 +182,18 @@ int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
                        qbus_walkerfn *busfn, void *opaque);
 void qdev_reset_all(DeviceState *dev);
+
+/**
+ * @qbus_reset_all:
+ * @bus: Bus to be reset.
+ *
+ * Reset @bus and perform a bus-level ("hard") reset of all devices connected
+ * to it, including recursive processing of all buses below @bus itself.  A
+ * hard reset means that qbus_reset_all will reset all state of the device.
+ * For PCI devices, for example, this will include the base address registers
+ * or configuration space.
+ */
+void qbus_reset_all(BusState *bus);
 void qbus_reset_all_fn(void *opaque);
 
 void qbus_free(BusState *bus);

hw/qdev.c

@@ -228,10 +228,15 @@ void qdev_reset_all(DeviceState *dev)
     qdev_walk_children(dev, qdev_reset_one, qbus_reset_one, NULL);
 }
 
+void qbus_reset_all(BusState *bus)
+{
+    qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
+}
+
 void qbus_reset_all_fn(void *opaque)
 {
     BusState *bus = opaque;
-    qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
+    qbus_reset_all(bus);
 }
 
 /* can be used as ->unplug() callback for the simple cases */