hw/core/qdev-hotplug.c

   1 /*
   2  * QDev Hotplug handlers
   3  *
   4  * Copyright (c) Red Hat
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "hw/qdev-core.h"
  14 #include "hw/boards.h"
  15
  16 HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev)
  17 {
  18     MachineState *machine;
  19     MachineClass *mc;
  20     Object *m_obj = qdev_get_machine();
  21
  22     if (object_dynamic_cast(m_obj, TYPE_MACHINE)) {
  23         machine = MACHINE(m_obj);
  24         mc = MACHINE_GET_CLASS(machine);
  25         if (mc->get_hotplug_handler) {
  26             return mc->get_hotplug_handler(machine, dev);
  27         }
  28     }
  29
  30     return NULL;
  31 }
  32
  33 bool qdev_hotplug_allowed(DeviceState *dev, Error **errp)
  34 {
  35     MachineState *machine;
  36     MachineClass *mc;
  37     Object *m_obj = qdev_get_machine();
  38
  39     if (object_dynamic_cast(m_obj, TYPE_MACHINE)) {
  40         machine = MACHINE(m_obj);
  41         mc = MACHINE_GET_CLASS(machine);
  42         if (mc->hotplug_allowed) {
  43             return mc->hotplug_allowed(machine, dev, errp);
  44         }
  45     }
  46
  47     return true;
  48 }
  49
  50 HotplugHandler *qdev_get_bus_hotplug_handler(DeviceState *dev)
  51 {
  52     if (dev->parent_bus) {
  53         return dev->parent_bus->hotplug_handler;
  54     }
  55     return NULL;
  56 }
  57
  58 HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev)
  59 {
  60     HotplugHandler *hotplug_ctrl = qdev_get_machine_hotplug_handler(dev);
  61
  62     if (hotplug_ctrl == NULL && dev->parent_bus) {
  63         hotplug_ctrl = qdev_get_bus_hotplug_handler(dev);
  64     }
  65     return hotplug_ctrl;
  66 }
  67
  68 /* can be used as ->unplug() callback for the simple cases */
  69 void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
  70                                   DeviceState *dev, Error **errp)
  71 {
  72     qdev_unrealize(dev);
  73 }