[Qemu-devel] [PATCH 2/9] qdev: add to BusState "hotplug-handler" link

[Igor Mammedov]

It will allow to reuse field with different BUSes, reducing code duplication.
Field is intended fot replacing 'hotplug_qdev' field in PCIBus and also
will allow to avoid adding equivalent field to DimmBus with possiblitity
to refactor other BUSes to use it instead of custom field.
In addition once all users of allow_hotplug field are converted to new
API, link could replace allow_hotplug in qdev hotplug code.

Signed-off-by: Igor Mammedov <address@hidden>
---
 hw/core/qdev.c         |    4 ++++
 include/hw/qdev-core.h |    5 +++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 82a9123..c9f0c33 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -32,6 +32,7 @@
 #include "qapi/visitor.h"
 #include "qapi/qmp/qjson.h"
 #include "monitor/monitor.h"
+#include "hw/hotplug.h"
 
 int qdev_hotplug = 0;
 static bool qdev_hot_added = false;
@@ -870,6 +871,9 @@ static void qbus_initfn(Object *obj)
     BusState *bus = BUS(obj);
 
     QTAILQ_INIT(&bus->children);
+    object_property_add_link(obj, QDEV_HOTPLUG_HANDLER_PROPERTY,
+                             TYPE_HOTPLUG_HANDLER,
+                             (Object **)&bus->hotplug_handler, NULL);
 }
 
 static char *default_bus_get_fw_dev_path(DeviceState *dev)
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 2c4f140..58a5c69 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -8,6 +8,7 @@
 #include "qom/object.h"
 #include "hw/irq.h"
 #include "qapi/error.h"
+#include "hw/hotplug.h"
 
 enum {
     DEV_NVECTORS_UNSPECIFIED = -1,
@@ -180,14 +181,18 @@ typedef struct BusChild {
     QTAILQ_ENTRY(BusChild) sibling;
 } BusChild;
 
+#define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
+
 /**
  * BusState:
+ * @hotplug_device: link to a hotplug device associated with bus.
  */
 struct BusState {
     Object obj;
     DeviceState *parent;
     const char *name;
     int allow_hotplug;
+    HotplugHandler *hotplug_handler;
     int max_index;
     QTAILQ_HEAD(ChildrenHead, BusChild) children;
     QLIST_ENTRY(BusState) sibling;
-- 
1.7.1