From a10f07a7d0827eeef920c16b500b50030b7ff651 Mon Sep 17 00:00:00 2001
From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 12 Dec 2011 14:29:28 -0600
Subject: qom: introduce root device

This is based on Jan's suggestion for how to do unique naming.  The root device
is the root of composition.  All devices are reachable via child<> links from
this device.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/container.c | 20 ++++++++++++++++++++
 hw/qdev.c      | 12 ++++++++++++
 hw/qdev.h      |  8 ++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 hw/container.c

(limited to 'hw')

diff --git a/hw/container.c b/hw/container.c
new file mode 100644
index 0000000000..9cbf3992c4
--- /dev/null
+++ b/hw/container.c
@@ -0,0 +1,20 @@
+#include "sysbus.h"
+
+static int container_initfn(SysBusDevice *dev)
+{
+    return 0;
+}
+
+static SysBusDeviceInfo container_info = {
+    .init = container_initfn,
+    .qdev.name = "container",
+    .qdev.size = sizeof(SysBusDevice),
+    .qdev.no_user = 1,
+};
+
+static void container_init(void)
+{
+    sysbus_register_withprop(&container_info);
+}
+
+device_init(container_init);
diff --git a/hw/qdev.c b/hw/qdev.c
index 6f77af91ef..bb0b9f7d6a 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -1161,3 +1161,15 @@ void qdev_property_add_legacy(DeviceState *dev, Property *prop,
 
     g_free(type);
 }
+
+DeviceState *qdev_get_root(void)
+{
+    static DeviceState *qdev_root;
+
+    if (!qdev_root) {
+        qdev_root = qdev_create(NULL, "container");
+        qdev_init_nofail(qdev_root);
+    }
+
+    return qdev_root;
+}
diff --git a/hw/qdev.h b/hw/qdev.h
index 3b629d4fbd..52aadd2f1f 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -482,4 +482,12 @@ const char *qdev_property_get_type(DeviceState *dev, const char *name,
  */
 void qdev_property_add_legacy(DeviceState *dev, Property *prop, Error **errp);
 
+/**
+ * @qdev_get_root - returns the root device of the composition tree
+ *
+ * Returns:
+ *   The root of the composition tree.
+ */
+DeviceState *qdev_get_root(void);
+
 #endif
-- 
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