| 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/core/qdev.h" |
| 14 | #include "hw/core/boards.h" |
| 15 | #include "qapi/error.h" |
| 16 | |
| 17 | HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev) |
| 18 | { |
| 19 | MachineState *machine; |
| 20 | MachineClass *mc; |
| 21 | Object *m_obj = qdev_get_machine(); |
| 22 | |
| 23 | if (object_dynamic_cast(m_obj, TYPE_MACHINE)) { |
| 24 | machine = MACHINE(m_obj); |
| 25 | mc = MACHINE_GET_CLASS(machine); |
| 26 | if (mc->get_hotplug_handler) { |
| 27 | return mc->get_hotplug_handler(machine, dev); |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | return NULL; |
| 32 | } |
| 33 | |
| 34 | static bool qdev_hotplug_unplug_allowed_common(DeviceState *dev, BusState *bus, |
| 35 | Error **errp) |
| 36 | { |
| 37 | DeviceClass *dc = DEVICE_GET_CLASS(dev); |
| 38 | |
| 39 | if (!dc->hotpluggable) { |
| 40 | error_setg(errp, "Device '%s' does not support hotplugging", |
| 41 | object_get_typename(OBJECT(dev))); |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | if (bus) { |
| 46 | if (!qbus_is_hotpluggable(bus)) { |
| 47 | error_setg(errp, "Bus '%s' does not support hotplugging", |
| 48 | bus->name); |
| 49 | return false; |
| 50 | } |
| 51 | } else { |
| 52 | if (!qdev_get_machine_hotplug_handler(dev)) { |
| 53 | /* |
| 54 | * No bus, no machine hotplug handler --> device is not hotpluggable |
| 55 | */ |
| 56 | error_setg(errp, |
| 57 | "Device '%s' can not be hotplugged on this machine", |
| 58 | object_get_typename(OBJECT(dev))); |
| 59 | return false; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | return true; |
| 64 | } |
| 65 | |
| 66 | bool qdev_hotplug_allowed(DeviceState *dev, BusState *bus, Error **errp) |
| 67 | { |
| 68 | MachineState *machine; |
| 69 | MachineClass *mc; |
| 70 | Object *m_obj = qdev_get_machine(); |
| 71 | |
| 72 | if (!qdev_hotplug_unplug_allowed_common(dev, bus, errp)) { |
| 73 | return false; |
| 74 | } |
| 75 | |
| 76 | if (object_dynamic_cast(m_obj, TYPE_MACHINE)) { |
| 77 | machine = MACHINE(m_obj); |
| 78 | mc = MACHINE_GET_CLASS(machine); |
| 79 | if (mc->hotplug_allowed) { |
| 80 | return mc->hotplug_allowed(machine, dev, errp); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | return true; |
| 85 | } |
| 86 | |
| 87 | bool qdev_hotunplug_allowed(DeviceState *dev, Error **errp) |
| 88 | { |
| 89 | return !qdev_unplug_blocked(dev, errp) && |
| 90 | qdev_hotplug_unplug_allowed_common(dev, dev->parent_bus, errp); |
| 91 | } |
| 92 | |
| 93 | HotplugHandler *qdev_get_bus_hotplug_handler(DeviceState *dev) |
| 94 | { |
| 95 | if (dev->parent_bus) { |
| 96 | return dev->parent_bus->hotplug_handler; |
| 97 | } |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev) |
| 102 | { |
| 103 | HotplugHandler *hotplug_ctrl = qdev_get_machine_hotplug_handler(dev); |
| 104 | |
| 105 | if (hotplug_ctrl == NULL && dev->parent_bus) { |
| 106 | hotplug_ctrl = qdev_get_bus_hotplug_handler(dev); |
| 107 | } |
| 108 | return hotplug_ctrl; |
| 109 | } |
| 110 | |
| 111 | /* can be used as ->unplug() callback for the simple cases */ |
| 112 | void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev, |
| 113 | DeviceState *dev, Error **errp) |
| 114 | { |
| 115 | qdev_unrealize(dev); |
| 116 | } |