2 * Dynamic device configuration and creation.
4 * Copyright (c) 2009 CodeSourcery
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 /* The theory here is that it should be possible to create a machine without
21 knowledge of specific devices. Historically board init routines have
22 passed a bunch of arguments to each device, requiring the board know
23 exactly which device it is dealing with. This file provides an abstract
24 API for device configuration and initialization. Devices will generally
25 inherit from a particular bus (e.g. PCI or I2C) rather than
34 static bool qdev_hot_added = false;
35 static bool qdev_hot_removed = false;
37 /* This is a nasty hack to allow passing a NULL bus to qdev_create. */
38 static BusState *main_system_bus;
39 static void main_system_bus_create(void);
41 /* Register a new device type. */
42 const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
44 DeviceClass *dc = DEVICE_GET_CLASS(dev);
48 BusInfo *qdev_get_bus_info(DeviceState *dev)
50 DeviceClass *dc = DEVICE_GET_CLASS(dev);
54 Property *qdev_get_props(DeviceState *dev)
56 DeviceClass *dc = DEVICE_GET_CLASS(dev);
60 const char *qdev_fw_name(DeviceState *dev)
62 DeviceClass *dc = DEVICE_GET_CLASS(dev);
68 return object_get_typename(OBJECT(dev));
71 bool qdev_exists(const char *name)
73 return !!object_class_by_name(name);
76 static void qdev_property_add_legacy(DeviceState *dev, Property *prop,
79 void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
84 assert(bus->allow_hotplug);
87 dev->parent_bus = bus;
88 QTAILQ_INSERT_HEAD(&bus->children, dev, sibling);
90 for (prop = qdev_get_bus_info(dev)->props; prop && prop->name; prop++) {
91 qdev_property_add_legacy(dev, prop, NULL);
92 qdev_property_add_static(dev, prop, NULL);
94 qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
97 /* Create a new device. This only initializes the device state structure
98 and allows properties to be set. qdev_init should be called to
99 initialize the actual device emulation. */
100 DeviceState *qdev_create(BusState *bus, const char *name)
104 dev = qdev_try_create(bus, name);
107 hw_error("Unknown device '%s' for bus '%s'\n", name,
110 hw_error("Unknown device '%s' for default sysbus\n", name);
117 DeviceState *qdev_try_create(BusState *bus, const char *type)
121 if (object_class_by_name(type) == NULL) {
124 dev = DEVICE(object_new(type));
130 bus = sysbus_get_default();
133 qdev_set_parent_bus(dev, bus);
134 qdev_prop_set_globals(dev);
139 /* Initialize a device. Device properties should be set before calling
140 this function. IRQs and MMIO regions should be connected/mapped after
141 calling this function.
142 On failure, destroy the device and return negative value.
143 Return 0 on success. */
144 int qdev_init(DeviceState *dev)
146 DeviceClass *dc = DEVICE_GET_CLASS(dev);
149 assert(dev->state == DEV_STATE_CREATED);
153 object_unparent(OBJECT(dev));
158 if (!OBJECT(dev)->parent) {
159 static int unattached_count = 0;
160 gchar *name = g_strdup_printf("device[%d]", unattached_count++);
162 object_property_add_child(container_get(qdev_get_machine(),
164 name, OBJECT(dev), NULL);
168 if (qdev_get_vmsd(dev)) {
169 vmstate_register_with_alias_id(dev, -1, qdev_get_vmsd(dev), dev,
170 dev->instance_id_alias,
171 dev->alias_required_for_version);
173 dev->state = DEV_STATE_INITIALIZED;
174 if (dev->hotplugged) {
180 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
181 int required_for_version)
183 assert(dev->state == DEV_STATE_CREATED);
184 dev->instance_id_alias = alias_id;
185 dev->alias_required_for_version = required_for_version;
188 void qdev_unplug(DeviceState *dev, Error **errp)
190 DeviceClass *dc = DEVICE_GET_CLASS(dev);
192 if (!dev->parent_bus->allow_hotplug) {
193 error_set(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
196 assert(dc->unplug != NULL);
198 qdev_hot_removed = true;
200 if (dc->unplug(dev) < 0) {
201 error_set(errp, QERR_UNDEFINED_ERROR);
206 static int qdev_reset_one(DeviceState *dev, void *opaque)
213 BusState *sysbus_get_default(void)
215 if (!main_system_bus) {
216 main_system_bus_create();
218 return main_system_bus;
221 static int qbus_reset_one(BusState *bus, void *opaque)
223 if (bus->info->reset) {
224 return bus->info->reset(bus);
229 void qdev_reset_all(DeviceState *dev)
231 qdev_walk_children(dev, qdev_reset_one, qbus_reset_one, NULL);
234 void qbus_reset_all_fn(void *opaque)
236 BusState *bus = opaque;
237 qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
240 /* can be used as ->unplug() callback for the simple cases */
241 int qdev_simple_unplug_cb(DeviceState *dev)
244 object_unparent(OBJECT(dev));
250 /* Like qdev_init(), but terminate program via error_report() instead of
251 returning an error value. This is okay during machine creation.
252 Don't use for hotplug, because there callers need to recover from
253 failure. Exception: if you know the device's init() callback can't
254 fail, then qdev_init_nofail() can't fail either, and is therefore
255 usable even then. But relying on the device implementation that
256 way is somewhat unclean, and best avoided. */
257 void qdev_init_nofail(DeviceState *dev)
259 if (qdev_init(dev) < 0) {
260 error_report("Initialization of device %s failed",
261 object_get_typename(OBJECT(dev)));
266 /* Unlink device from bus and free the structure. */
267 void qdev_free(DeviceState *dev)
269 object_delete(OBJECT(dev));
272 void qdev_machine_creation_done(void)
275 * ok, initial machine setup is done, starting from now we can
276 * only create hotpluggable devices
281 bool qdev_machine_modified(void)
283 return qdev_hot_added || qdev_hot_removed;
286 BusState *qdev_get_parent_bus(DeviceState *dev)
288 return dev->parent_bus;
291 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
293 assert(dev->num_gpio_in == 0);
294 dev->num_gpio_in = n;
295 dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
298 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
300 assert(dev->num_gpio_out == 0);
301 dev->num_gpio_out = n;
302 dev->gpio_out = pins;
305 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
307 assert(n >= 0 && n < dev->num_gpio_in);
308 return dev->gpio_in[n];
311 void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
313 assert(n >= 0 && n < dev->num_gpio_out);
314 dev->gpio_out[n] = pin;
317 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
319 qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
321 qdev_prop_set_vlan(dev, "vlan", nd->vlan);
323 qdev_prop_set_netdev(dev, "netdev", nd->netdev);
324 if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
325 qdev_prop_exists(dev, "vectors")) {
326 qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
328 nd->instantiated = 1;
331 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
335 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
336 if (strcmp(name, bus->name) == 0) {
343 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
344 qbus_walkerfn *busfn, void *opaque)
350 err = busfn(bus, opaque);
356 QTAILQ_FOREACH(dev, &bus->children, sibling) {
357 err = qdev_walk_children(dev, devfn, busfn, opaque);
366 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
367 qbus_walkerfn *busfn, void *opaque)
373 err = devfn(dev, opaque);
379 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
380 err = qbus_walk_children(bus, devfn, busfn, opaque);
389 DeviceState *qdev_find_recursive(BusState *bus, const char *id)
391 DeviceState *dev, *ret;
394 QTAILQ_FOREACH(dev, &bus->children, sibling) {
395 if (dev->id && strcmp(dev->id, id) == 0)
397 QLIST_FOREACH(child, &dev->child_bus, sibling) {
398 ret = qdev_find_recursive(child, id);
407 void qbus_create_inplace(BusState *bus, BusInfo *info,
408 DeviceState *parent, const char *name)
414 bus->parent = parent;
417 /* use supplied name */
418 bus->name = g_strdup(name);
419 } else if (parent && parent->id) {
420 /* parent device has id -> use it for bus name */
421 len = strlen(parent->id) + 16;
423 snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
426 /* no id -> use lowercase bus type for bus name */
427 len = strlen(info->name) + 16;
429 len = snprintf(buf, len, "%s.%d", info->name,
430 parent ? parent->num_child_bus : 0);
431 for (i = 0; i < len; i++)
432 buf[i] = qemu_tolower(buf[i]);
436 QTAILQ_INIT(&bus->children);
438 QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
439 parent->num_child_bus++;
440 } else if (bus != main_system_bus) {
441 /* TODO: once all bus devices are qdevified,
442 only reset handler for main_system_bus should be registered here. */
443 qemu_register_reset(qbus_reset_all_fn, bus);
447 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
451 bus = g_malloc0(info->size);
452 bus->qdev_allocated = 1;
453 qbus_create_inplace(bus, info, parent, name);
457 static void main_system_bus_create(void)
459 /* assign main_system_bus before qbus_create_inplace()
460 * in order to make "if (bus != main_system_bus)" work */
461 main_system_bus = g_malloc0(system_bus_info.size);
462 main_system_bus->qdev_allocated = 1;
463 qbus_create_inplace(main_system_bus, &system_bus_info, NULL,
467 void qbus_free(BusState *bus)
471 while ((dev = QTAILQ_FIRST(&bus->children)) != NULL) {
475 QLIST_REMOVE(bus, sibling);
476 bus->parent->num_child_bus--;
478 assert(bus != main_system_bus); /* main_system_bus is never freed */
479 qemu_unregister_reset(qbus_reset_all_fn, bus);
481 g_free((void*)bus->name);
482 if (bus->qdev_allocated) {
487 static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
491 if (dev && dev->parent_bus) {
493 l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
494 if (dev->parent_bus->info->get_fw_dev_path) {
495 d = dev->parent_bus->info->get_fw_dev_path(dev);
496 l += snprintf(p + l, size - l, "%s", d);
499 l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
502 l += snprintf(p + l , size - l, "/");
507 char* qdev_get_fw_dev_path(DeviceState *dev)
512 l = qdev_get_fw_dev_path_helper(dev, path, 128);
519 static char *qdev_get_type(Object *obj, Error **errp)
521 return g_strdup(object_get_typename(obj));
525 * Legacy property handling
528 static void qdev_get_legacy_property(Object *obj, Visitor *v, void *opaque,
529 const char *name, Error **errp)
531 DeviceState *dev = DEVICE(obj);
532 Property *prop = opaque;
537 prop->info->print(dev, prop, buffer, sizeof(buffer));
538 visit_type_str(v, &ptr, name, errp);
541 static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
542 const char *name, Error **errp)
544 DeviceState *dev = DEVICE(obj);
545 Property *prop = opaque;
546 Error *local_err = NULL;
550 if (dev->state != DEV_STATE_CREATED) {
551 error_set(errp, QERR_PERMISSION_DENIED);
555 visit_type_str(v, &ptr, name, &local_err);
557 error_propagate(errp, local_err);
561 ret = prop->info->parse(dev, prop, ptr);
562 error_set_from_qdev_prop_error(errp, ret, dev, prop, ptr);
567 * @qdev_add_legacy_property - adds a legacy property
569 * Do not use this is new code! Properties added through this interface will
570 * be given names and types in the "legacy" namespace.
572 * Legacy properties are string versions of other OOM properties. The format
573 * of the string depends on the property type.
575 void qdev_property_add_legacy(DeviceState *dev, Property *prop,
580 /* Register pointer properties as legacy properties */
581 if (!prop->info->print && !prop->info->parse &&
582 (prop->info->set || prop->info->get)) {
586 name = g_strdup_printf("legacy-%s", prop->name);
587 type = g_strdup_printf("legacy<%s>",
588 prop->info->legacy_name ?: prop->info->name);
590 object_property_add(OBJECT(dev), name, type,
591 prop->info->print ? qdev_get_legacy_property : prop->info->get,
592 prop->info->parse ? qdev_set_legacy_property : prop->info->set,
601 * @qdev_property_add_static - add a @Property to a device.
603 * Static properties access data in a struct. The actual type of the
604 * property and the field depends on the property type.
606 void qdev_property_add_static(DeviceState *dev, Property *prop,
610 * TODO qdev_prop_ptr does not have getters or setters. It must
611 * go now that it can be replaced with links. The test should be
612 * removed along with it: all static properties are read/write.
614 if (!prop->info->get && !prop->info->set) {
618 object_property_add(OBJECT(dev), prop->name, prop->info->name,
619 prop->info->get, prop->info->set,
624 static void device_initfn(Object *obj)
626 DeviceState *dev = DEVICE(obj);
631 qdev_hot_added = true;
634 dev->instance_id_alias = -1;
635 dev->state = DEV_STATE_CREATED;
637 for (prop = qdev_get_props(dev); prop && prop->name; prop++) {
638 qdev_property_add_legacy(dev, prop, NULL);
639 qdev_property_add_static(dev, prop, NULL);
642 object_property_add_str(OBJECT(dev), "type", qdev_get_type, NULL, NULL);
643 qdev_prop_set_defaults(dev, qdev_get_props(dev));
646 /* Unlink device from bus and free the structure. */
647 static void device_finalize(Object *obj)
649 DeviceState *dev = DEVICE(obj);
651 DeviceClass *dc = DEVICE_GET_CLASS(dev);
653 if (dev->state == DEV_STATE_INITIALIZED) {
654 while (dev->num_child_bus) {
655 bus = QLIST_FIRST(&dev->child_bus);
658 if (qdev_get_vmsd(dev)) {
659 vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
665 qemu_opts_del(dev->opts);
668 QTAILQ_REMOVE(&dev->parent_bus->children, dev, sibling);
671 void device_reset(DeviceState *dev)
673 DeviceClass *klass = DEVICE_GET_CLASS(dev);
680 Object *qdev_get_machine(void)
685 dev = container_get(object_get_root(), "/machine");
691 static TypeInfo device_type_info = {
693 .parent = TYPE_OBJECT,
694 .instance_size = sizeof(DeviceState),
695 .instance_init = device_initfn,
696 .instance_finalize = device_finalize,
698 .class_size = sizeof(DeviceClass),
701 static void qdev_register_types(void)
703 type_register_static(&device_type_info);
706 type_init(qdev_register_types)