[Qemu-devel] [PATCH 1/7] define hotplug interface

[Igor Mammedov <imammedo@redhat.com>]

Provide generic hotplug interface for devices.
Intended for replacing hotplug mechanism used by
PCI/PCIE/SHPC code.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
it's scsi-bus like interface, but abstracted from bus altogether
since all current users care about in hotplug handlers, it's
hotplug device and hotplugged device and bus only serves
as a means to get access to hotplug device and it's callbacks.
---
 hw/core/Makefile.objs |    1 +
 hw/core/hotplug.c     |   25 ++++++++++++++++++++++++
 include/hw/hotplug.h  |   50 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 0 deletions(-)
 create mode 100644 hw/core/hotplug.c
 create mode 100644 include/hw/hotplug.h

diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index 950146c..47f6555 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -10,4 +10,5 @@ common-obj-$(CONFIG_SOFTMMU) += sysbus.o
 common-obj-$(CONFIG_SOFTMMU) += null-machine.o
 common-obj-$(CONFIG_SOFTMMU) += loader.o
 common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
+common-obj-$(CONFIG_SOFTMMU) += hotplug.o
 
diff --git a/hw/core/hotplug.c b/hw/core/hotplug.c
new file mode 100644
index 0000000..3e84d9c
--- /dev/null
+++ b/hw/core/hotplug.c
@@ -0,0 +1,25 @@
+/*
+ * Hotplug device interface.
+ *
+ * Copyright (c) 2013 Red Hat Inc.
+ *
+ * Authors:
+ *  Igor Mammedov <imammedo@redhat.com>,
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#include "hw/hotplug.h"
+
+static const TypeInfo hotplug_device_info = {
+    .name          = TYPE_HOTPLUG_DEVICE,
+    .parent        = TYPE_INTERFACE,
+    .class_size = sizeof(HotplugDeviceClass),
+};
+
+static void hotplug_device_register_types(void)
+{
+    type_register_static(&hotplug_device_info);
+}
+
+type_init(hotplug_device_register_types)
diff --git a/include/hw/hotplug.h b/include/hw/hotplug.h
new file mode 100644
index 0000000..cfa79bb
--- /dev/null
+++ b/include/hw/hotplug.h
@@ -0,0 +1,50 @@
+/*
+ * Hotplug device interface.
+ *
+ * Copyright (c) 2013 Red Hat Inc.
+ *
+ * Authors:
+ *  Igor Mammedov <imammedo@redhat.com>,
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef HOTPLUG_H
+#define HOTPLUG_H
+
+#include "hw/qdev-core.h"
+
+#define TYPE_HOTPLUG_DEVICE "hotplug-device"
+
+#define HOTPLUG_DEVICE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(HotplugDeviceClass, (klass), TYPE_HOTPLUG_DEVICE)
+#define HOTPLUG_DEVICE_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(HotplugDeviceClass, (obj), TYPE_HOTPLUG_DEVICE)
+
+/**
+ * hotplug_fn:
+ * @hotplug_dev: a device performing hotplug/uplug action
+ * @hotplugged_dev: a device that has been hotplugged
+ * @errp: returns an error if this function fails
+ */
+typedef void (*hotplug_fn)(DeviceState *hotplug_dev,
+                           DeviceState *hotplugged_dev, Error **errp);
+
+/**
+ * HotplugDeviceClass:
+ *
+ * Interface to be implemented by a device performing
+ * hardware hotplug/unplug functions.
+ *
+ * @parent: Opaque parent interface.
+ * @hotplug: hotplug callback.
+ * @hot_unplug: hot unplug callback.
+ */
+typedef struct HotplugDeviceClass {
+    InterfaceClass parent;
+
+    hotplug_fn hotplug;
+    hotplug_fn hot_unplug;
+} HotplugDeviceClass;
+
+#endif
-- 
1.7.1