Patchwork [v2,04/18] qom: introduce root device

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Submitter Anthony Liguori
Date Dec. 2, 2011, 8:20 p.m.
Message ID <1322857256-14951-5-git-send-email-aliguori@us.ibm.com>
Download mbox | patch
Permalink /patch/128978/
State New
Headers show

Comments

Anthony Liguori - Dec. 2, 2011, 8:20 p.m.
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>
---
 Makefile.objs  |    2 +-
 hw/container.c |   20 ++++++++++++++++++++
 hw/qdev.c      |   12 ++++++++++++
 hw/qdev.h      |    8 ++++++++
 4 files changed, 41 insertions(+), 1 deletions(-)
 create mode 100644 hw/container.c

Patch

diff --git a/Makefile.objs b/Makefile.objs
index d7a6539..10e794c 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -279,7 +279,7 @@  hw-obj-$(CONFIG_LSI_SCSI_PCI) += lsi53c895a.o
 hw-obj-$(CONFIG_ESP) += esp.o
 
 hw-obj-y += dma-helpers.o sysbus.o isa-bus.o
-hw-obj-y += qdev-addr.o
+hw-obj-y += qdev-addr.o container.o
 
 # VGA
 hw-obj-$(CONFIG_VGA_PCI) += vga-pci.o
diff --git a/hw/container.c b/hw/container.c
new file mode 100644
index 0000000..9cbf399
--- /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 6f77af9..bb0b9f7 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 3b629d4..52aadd2 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