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
33 static bool qdev_hot_added = false;
34 static bool qdev_hot_removed = false;
36 /* This is a nasty hack to allow passing a NULL bus to qdev_create. */
37 static BusState *main_system_bus;
38 static void main_system_bus_create(void);
40 /* Register a new device type. */
41 const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
43 DeviceClass *dc = DEVICE_GET_CLASS(dev);
47 BusInfo *qdev_get_bus_info(DeviceState *dev)
49 DeviceClass *dc = DEVICE_GET_CLASS(dev);
53 Property *qdev_get_props(DeviceState *dev)
55 DeviceClass *dc = DEVICE_GET_CLASS(dev);
59 const char *qdev_fw_name(DeviceState *dev)
61 DeviceClass *dc = DEVICE_GET_CLASS(dev);
67 return object_get_typename(OBJECT(dev));
70 bool qdev_exists(const char *name)
72 return !!object_class_by_name(name);
75 static void qdev_property_add_legacy(DeviceState *dev, Property *prop,
78 void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
83 assert(bus->allow_hotplug);
86 dev->parent_bus = bus;
87 QTAILQ_INSERT_HEAD(&bus->children, dev, sibling);
89 for (prop = qdev_get_bus_info(dev)->props; prop && prop->name; prop++) {
90 qdev_property_add_legacy(dev, prop, NULL);
91 qdev_property_add_static(dev, prop, NULL);
93 qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
96 /* Create a new device. This only initializes the device state structure
97 and allows properties to be set. qdev_init should be called to
98 initialize the actual device emulation. */
99 DeviceState *qdev_create(BusState *bus, const char *name)
103 dev = qdev_try_create(bus, name);
106 hw_error("Unknown device '%s' for bus '%s'\n", name,
109 hw_error("Unknown device '%s' for default sysbus\n", name);
116 DeviceState *qdev_try_create(BusState *bus, const char *type)
120 if (object_class_by_name(type) == NULL) {
123 dev = DEVICE(object_new(type));
129 bus = sysbus_get_default();
132 qdev_set_parent_bus(dev, bus);
133 qdev_prop_set_globals(dev);
138 /* Initialize a device. Device properties should be set before calling
139 this function. IRQs and MMIO regions should be connected/mapped after
140 calling this function.
141 On failure, destroy the device and return negative value.
142 Return 0 on success. */
143 int qdev_init(DeviceState *dev)
145 DeviceClass *dc = DEVICE_GET_CLASS(dev);
148 assert(dev->state == DEV_STATE_CREATED);
156 if (!OBJECT(dev)->parent) {
157 static int unattached_count = 0;
158 gchar *name = g_strdup_printf("device[%d]", unattached_count++);
160 object_property_add_child(container_get("/machine/unattached"), name,
165 if (qdev_get_vmsd(dev)) {
166 vmstate_register_with_alias_id(dev, -1, qdev_get_vmsd(dev), dev,
167 dev->instance_id_alias,
168 dev->alias_required_for_version);
170 dev->state = DEV_STATE_INITIALIZED;
171 if (dev->hotplugged) {
177 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
178 int required_for_version)
180 assert(dev->state == DEV_STATE_CREATED);
181 dev->instance_id_alias = alias_id;
182 dev->alias_required_for_version = required_for_version;
185 int qdev_unplug(DeviceState *dev)
187 DeviceClass *dc = DEVICE_GET_CLASS(dev);
189 if (!dev->parent_bus->allow_hotplug) {
190 qerror_report(QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
193 assert(dc->unplug != NULL);
195 qdev_hot_removed = true;
197 return dc->unplug(dev);
200 static int qdev_reset_one(DeviceState *dev, void *opaque)
207 BusState *sysbus_get_default(void)
209 if (!main_system_bus) {
210 main_system_bus_create();
212 return main_system_bus;
215 static int qbus_reset_one(BusState *bus, void *opaque)
217 if (bus->info->reset) {
218 return bus->info->reset(bus);
223 void qdev_reset_all(DeviceState *dev)
225 qdev_walk_children(dev, qdev_reset_one, qbus_reset_one, NULL);
228 void qbus_reset_all_fn(void *opaque)
230 BusState *bus = opaque;
231 qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
234 /* can be used as ->unplug() callback for the simple cases */
235 int qdev_simple_unplug_cb(DeviceState *dev)
238 object_unparent(OBJECT(dev));
244 /* Like qdev_init(), but terminate program via error_report() instead of
245 returning an error value. This is okay during machine creation.
246 Don't use for hotplug, because there callers need to recover from
247 failure. Exception: if you know the device's init() callback can't
248 fail, then qdev_init_nofail() can't fail either, and is therefore
249 usable even then. But relying on the device implementation that
250 way is somewhat unclean, and best avoided. */
251 void qdev_init_nofail(DeviceState *dev)
253 if (qdev_init(dev) < 0) {
254 error_report("Initialization of device %s failed",
255 object_get_typename(OBJECT(dev)));
260 /* Unlink device from bus and free the structure. */
261 void qdev_free(DeviceState *dev)
263 object_delete(OBJECT(dev));
266 void qdev_machine_creation_done(void)
269 * ok, initial machine setup is done, starting from now we can
270 * only create hotpluggable devices
275 bool qdev_machine_modified(void)
277 return qdev_hot_added || qdev_hot_removed;
280 BusState *qdev_get_parent_bus(DeviceState *dev)
282 return dev->parent_bus;
285 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
287 assert(dev->num_gpio_in == 0);
288 dev->num_gpio_in = n;
289 dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
292 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
294 assert(dev->num_gpio_out == 0);
295 dev->num_gpio_out = n;
296 dev->gpio_out = pins;
299 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
301 assert(n >= 0 && n < dev->num_gpio_in);
302 return dev->gpio_in[n];
305 void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
307 assert(n >= 0 && n < dev->num_gpio_out);
308 dev->gpio_out[n] = pin;
311 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
313 qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
315 qdev_prop_set_vlan(dev, "vlan", nd->vlan);
317 qdev_prop_set_netdev(dev, "netdev", nd->netdev);
318 if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
319 qdev_prop_exists(dev, "vectors")) {
320 qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
322 nd->instantiated = 1;
325 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
329 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
330 if (strcmp(name, bus->name) == 0) {
337 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
338 qbus_walkerfn *busfn, void *opaque)
344 err = busfn(bus, opaque);
350 QTAILQ_FOREACH(dev, &bus->children, sibling) {
351 err = qdev_walk_children(dev, devfn, busfn, opaque);
360 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
361 qbus_walkerfn *busfn, void *opaque)
367 err = devfn(dev, opaque);
373 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
374 err = qbus_walk_children(bus, devfn, busfn, opaque);
383 DeviceState *qdev_find_recursive(BusState *bus, const char *id)
385 DeviceState *dev, *ret;
388 QTAILQ_FOREACH(dev, &bus->children, sibling) {
389 if (dev->id && strcmp(dev->id, id) == 0)
391 QLIST_FOREACH(child, &dev->child_bus, sibling) {
392 ret = qdev_find_recursive(child, id);
401 void qbus_create_inplace(BusState *bus, BusInfo *info,
402 DeviceState *parent, const char *name)
408 bus->parent = parent;
411 /* use supplied name */
412 bus->name = g_strdup(name);
413 } else if (parent && parent->id) {
414 /* parent device has id -> use it for bus name */
415 len = strlen(parent->id) + 16;
417 snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
420 /* no id -> use lowercase bus type for bus name */
421 len = strlen(info->name) + 16;
423 len = snprintf(buf, len, "%s.%d", info->name,
424 parent ? parent->num_child_bus : 0);
425 for (i = 0; i < len; i++)
426 buf[i] = qemu_tolower(buf[i]);
430 QTAILQ_INIT(&bus->children);
432 QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
433 parent->num_child_bus++;
434 } else if (bus != main_system_bus) {
435 /* TODO: once all bus devices are qdevified,
436 only reset handler for main_system_bus should be registered here. */
437 qemu_register_reset(qbus_reset_all_fn, bus);
441 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
445 bus = g_malloc0(info->size);
446 bus->qdev_allocated = 1;
447 qbus_create_inplace(bus, info, parent, name);
451 static void main_system_bus_create(void)
453 /* assign main_system_bus before qbus_create_inplace()
454 * in order to make "if (bus != main_system_bus)" work */
455 main_system_bus = g_malloc0(system_bus_info.size);
456 main_system_bus->qdev_allocated = 1;
457 qbus_create_inplace(main_system_bus, &system_bus_info, NULL,
461 void qbus_free(BusState *bus)
465 while ((dev = QTAILQ_FIRST(&bus->children)) != NULL) {
469 QLIST_REMOVE(bus, sibling);
470 bus->parent->num_child_bus--;
472 assert(bus != main_system_bus); /* main_system_bus is never freed */
473 qemu_unregister_reset(qbus_reset_all_fn, bus);
475 g_free((void*)bus->name);
476 if (bus->qdev_allocated) {
481 static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
485 if (dev && dev->parent_bus) {
487 l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
488 if (dev->parent_bus->info->get_fw_dev_path) {
489 d = dev->parent_bus->info->get_fw_dev_path(dev);
490 l += snprintf(p + l, size - l, "%s", d);
493 l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
496 l += snprintf(p + l , size - l, "/");
501 char* qdev_get_fw_dev_path(DeviceState *dev)
506 l = qdev_get_fw_dev_path_helper(dev, path, 128);
513 static char *qdev_get_type(Object *obj, Error **errp)
515 return g_strdup(object_get_typename(obj));
519 * Legacy property handling
522 static void qdev_get_legacy_property(Object *obj, Visitor *v, void *opaque,
523 const char *name, Error **errp)
525 DeviceState *dev = DEVICE(obj);
526 Property *prop = opaque;
531 prop->info->print(dev, prop, buffer, sizeof(buffer));
532 visit_type_str(v, &ptr, name, errp);
535 static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
536 const char *name, Error **errp)
538 DeviceState *dev = DEVICE(obj);
539 Property *prop = opaque;
540 Error *local_err = NULL;
544 if (dev->state != DEV_STATE_CREATED) {
545 error_set(errp, QERR_PERMISSION_DENIED);
549 visit_type_str(v, &ptr, name, &local_err);
551 error_propagate(errp, local_err);
555 ret = prop->info->parse(dev, prop, ptr);
556 error_set_from_qdev_prop_error(errp, ret, dev, prop, ptr);
561 * @qdev_add_legacy_property - adds a legacy property
563 * Do not use this is new code! Properties added through this interface will
564 * be given names and types in the "legacy" namespace.
566 * Legacy properties are string versions of other OOM properties. The format
567 * of the string depends on the property type.
569 void qdev_property_add_legacy(DeviceState *dev, Property *prop,
574 if (!prop->info->print && !prop->info->parse) {
577 name = g_strdup_printf("legacy-%s", prop->name);
578 type = g_strdup_printf("legacy<%s>",
579 prop->info->legacy_name ?: prop->info->name);
581 object_property_add(OBJECT(dev), name, type,
582 prop->info->print ? qdev_get_legacy_property : prop->info->get,
583 prop->info->parse ? qdev_set_legacy_property : prop->info->set,
592 * @qdev_property_add_static - add a @Property to a device.
594 * Static properties access data in a struct. The actual type of the
595 * property and the field depends on the property type.
597 void qdev_property_add_static(DeviceState *dev, Property *prop,
601 * TODO qdev_prop_ptr does not have getters or setters. It must
602 * go now that it can be replaced with links. The test should be
603 * removed along with it: all static properties are read/write.
605 if (!prop->info->get && !prop->info->set) {
609 object_property_add(OBJECT(dev), prop->name, prop->info->name,
610 prop->info->get, prop->info->set,
615 static void device_initfn(Object *obj)
617 DeviceState *dev = DEVICE(obj);
622 qdev_hot_added = true;
625 dev->instance_id_alias = -1;
626 dev->state = DEV_STATE_CREATED;
628 for (prop = qdev_get_props(dev); prop && prop->name; prop++) {
629 qdev_property_add_legacy(dev, prop, NULL);
630 qdev_property_add_static(dev, prop, NULL);
633 object_property_add_str(OBJECT(dev), "type", qdev_get_type, NULL, NULL);
634 qdev_prop_set_defaults(dev, qdev_get_props(dev));
637 /* Unlink device from bus and free the structure. */
638 static void device_finalize(Object *obj)
640 DeviceState *dev = DEVICE(obj);
642 DeviceClass *dc = DEVICE_GET_CLASS(dev);
644 if (dev->state == DEV_STATE_INITIALIZED) {
645 while (dev->num_child_bus) {
646 bus = QLIST_FIRST(&dev->child_bus);
649 if (qdev_get_vmsd(dev)) {
650 vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
656 qemu_opts_del(dev->opts);
659 QTAILQ_REMOVE(&dev->parent_bus->children, dev, sibling);
662 void device_reset(DeviceState *dev)
664 DeviceClass *klass = DEVICE_GET_CLASS(dev);
671 Object *qdev_get_machine(void)
676 dev = container_get("/machine");
682 static TypeInfo device_type_info = {
684 .parent = TYPE_OBJECT,
685 .instance_size = sizeof(DeviceState),
686 .instance_init = device_initfn,
687 .instance_finalize = device_finalize,
689 .class_size = sizeof(DeviceClass),
692 static void qdev_register_types(void)
694 type_register_static(&device_type_info);
697 type_init(qdev_register_types)