[Qemu-devel] [PATCH 2/2] qbus: make bus reset overrideable by subclasses

[Anthony Liguori <aliguori@us.ibm.com>]

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/qdev-core.h | 15 +++++++++++++++
 hw/qdev.c      | 16 +++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/hw/qdev-core.h b/hw/qdev-core.h
index f40fd15..453a061 100644
--- a/hw/qdev-core.h
+++ b/hw/qdev-core.h
@@ -100,7 +100,22 @@ struct BusClass {
      * bindings can be found at http://playground.sun.com/1275/bindings/.
      */
     char *(*get_fw_dev_path)(DeviceState *dev);
+
+    /**
+     * reset:
+     *
+     * Cold reset of a bus. This only resets the controller state of the bus.
+     */
     int (*reset)(BusState *bus);
+
+    /**
+     * reset_all:
+     *
+     * Cold reset of a bus with children.  The default implementation of this
+     * method will invoke BusState::reset and then recursively call
+     * qdev_reset_all() on each child in an arbitrary order.
+     */
+    void (*reset_all)(BusState *bus);
 };
 
 typedef struct BusChild {
diff --git a/hw/qdev.c b/hw/qdev.c
index e02b5be..db19b14 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -234,11 +234,17 @@ void qdev_reset_all(DeviceState *dev)
     dc->reset_all(dev);
 }
 
-void qbus_reset_all(BusState *bus)
+static void qbus_reset_children(BusState *bus)
 {
     qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
 }
 
+void qbus_reset_all(BusState *bus)
+{
+    BusClass *bc = BUS_GET_CLASS(bus);
+    bc->reset_all(bus);
+}
+
 void qbus_reset_all_fn(void *opaque)
 {
     BusState *bus = opaque;
@@ -758,6 +764,13 @@ static const TypeInfo device_type_info = {
     .class_size = sizeof(DeviceClass),
 };
 
+static void qbus_class_initfn(ObjectClass *klass, void *data)
+{
+    BusClass *bc = BUS_CLASS(klass);
+
+    bc->reset_all = qbus_reset_children;
+}
+
 static void qbus_initfn(Object *obj)
 {
     BusState *bus = BUS(obj);
@@ -789,6 +802,7 @@ static const TypeInfo bus_info = {
     .parent = TYPE_OBJECT,
     .instance_size = sizeof(BusState),
     .abstract = true,
+    .class_init = qbus_class_initfn,
     .class_size = sizeof(BusClass),
     .instance_init = qbus_initfn,
     .instance_finalize = qbus_finalize,
-- 
1.8.0