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 qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
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);
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 *name)
120 dev = DEVICE(object_new(name));
126 bus = sysbus_get_default();
129 qdev_set_parent_bus(dev, bus);
130 qdev_prop_set_globals(dev);
135 /* Initialize a device. Device properties should be set before calling
136 this function. IRQs and MMIO regions should be connected/mapped after
137 calling this function.
138 On failure, destroy the device and return negative value.
139 Return 0 on success. */
140 int qdev_init(DeviceState *dev)
142 DeviceClass *dc = DEVICE_GET_CLASS(dev);
145 assert(dev->state == DEV_STATE_CREATED);
152 if (qdev_get_vmsd(dev)) {
153 vmstate_register_with_alias_id(dev, -1, qdev_get_vmsd(dev), dev,
154 dev->instance_id_alias,
155 dev->alias_required_for_version);
157 dev->state = DEV_STATE_INITIALIZED;
158 if (dev->hotplugged) {
164 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
165 int required_for_version)
167 assert(dev->state == DEV_STATE_CREATED);
168 dev->instance_id_alias = alias_id;
169 dev->alias_required_for_version = required_for_version;
172 int qdev_unplug(DeviceState *dev)
174 DeviceClass *dc = DEVICE_GET_CLASS(dev);
176 if (!dev->parent_bus->allow_hotplug) {
177 qerror_report(QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
180 assert(dc->unplug != NULL);
182 qdev_hot_removed = true;
184 return dc->unplug(dev);
187 static int qdev_reset_one(DeviceState *dev, void *opaque)
194 BusState *sysbus_get_default(void)
196 if (!main_system_bus) {
197 main_system_bus_create();
199 return main_system_bus;
202 static int qbus_reset_one(BusState *bus, void *opaque)
204 if (bus->info->reset) {
205 return bus->info->reset(bus);
210 void qdev_reset_all(DeviceState *dev)
212 qdev_walk_children(dev, qdev_reset_one, qbus_reset_one, NULL);
215 void qbus_reset_all_fn(void *opaque)
217 BusState *bus = opaque;
218 qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
221 /* can be used as ->unplug() callback for the simple cases */
222 int qdev_simple_unplug_cb(DeviceState *dev)
225 object_unparent(OBJECT(dev));
231 /* Like qdev_init(), but terminate program via error_report() instead of
232 returning an error value. This is okay during machine creation.
233 Don't use for hotplug, because there callers need to recover from
234 failure. Exception: if you know the device's init() callback can't
235 fail, then qdev_init_nofail() can't fail either, and is therefore
236 usable even then. But relying on the device implementation that
237 way is somewhat unclean, and best avoided. */
238 void qdev_init_nofail(DeviceState *dev)
240 if (qdev_init(dev) < 0) {
241 error_report("Initialization of device %s failed",
242 object_get_typename(OBJECT(dev)));
247 /* Unlink device from bus and free the structure. */
248 void qdev_free(DeviceState *dev)
252 DeviceClass *dc = DEVICE_GET_CLASS(dev);
254 if (dev->state == DEV_STATE_INITIALIZED) {
255 while (dev->num_child_bus) {
256 bus = QLIST_FIRST(&dev->child_bus);
259 if (qdev_get_vmsd(dev)) {
260 vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
266 qemu_opts_del(dev->opts);
269 QTAILQ_REMOVE(&dev->parent_bus->children, dev, sibling);
270 for (prop = qdev_get_props(dev); prop && prop->name; prop++) {
271 if (prop->info->free) {
272 prop->info->free(dev, prop);
275 object_delete(OBJECT(dev));
278 void qdev_machine_creation_done(void)
281 * ok, initial machine setup is done, starting from now we can
282 * only create hotpluggable devices
287 bool qdev_machine_modified(void)
289 return qdev_hot_added || qdev_hot_removed;
292 BusState *qdev_get_parent_bus(DeviceState *dev)
294 return dev->parent_bus;
297 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
299 assert(dev->num_gpio_in == 0);
300 dev->num_gpio_in = n;
301 dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
304 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
306 assert(dev->num_gpio_out == 0);
307 dev->num_gpio_out = n;
308 dev->gpio_out = pins;
311 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
313 assert(n >= 0 && n < dev->num_gpio_in);
314 return dev->gpio_in[n];
317 void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
319 assert(n >= 0 && n < dev->num_gpio_out);
320 dev->gpio_out[n] = pin;
323 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
325 qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
327 qdev_prop_set_vlan(dev, "vlan", nd->vlan);
329 qdev_prop_set_netdev(dev, "netdev", nd->netdev);
330 if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
331 qdev_prop_exists(dev, "vectors")) {
332 qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
334 nd->instantiated = 1;
337 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
341 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
342 if (strcmp(name, bus->name) == 0) {
349 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
350 qbus_walkerfn *busfn, void *opaque)
356 err = busfn(bus, opaque);
362 QTAILQ_FOREACH(dev, &bus->children, sibling) {
363 err = qdev_walk_children(dev, devfn, busfn, opaque);
372 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
373 qbus_walkerfn *busfn, void *opaque)
379 err = devfn(dev, opaque);
385 QLIST_FOREACH(bus, &dev->child_bus, sibling) {
386 err = qbus_walk_children(bus, devfn, busfn, opaque);
395 DeviceState *qdev_find_recursive(BusState *bus, const char *id)
397 DeviceState *dev, *ret;
400 QTAILQ_FOREACH(dev, &bus->children, sibling) {
401 if (dev->id && strcmp(dev->id, id) == 0)
403 QLIST_FOREACH(child, &dev->child_bus, sibling) {
404 ret = qdev_find_recursive(child, id);
413 void qbus_create_inplace(BusState *bus, BusInfo *info,
414 DeviceState *parent, const char *name)
420 bus->parent = parent;
423 /* use supplied name */
424 bus->name = g_strdup(name);
425 } else if (parent && parent->id) {
426 /* parent device has id -> use it for bus name */
427 len = strlen(parent->id) + 16;
429 snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
432 /* no id -> use lowercase bus type for bus name */
433 len = strlen(info->name) + 16;
435 len = snprintf(buf, len, "%s.%d", info->name,
436 parent ? parent->num_child_bus : 0);
437 for (i = 0; i < len; i++)
438 buf[i] = qemu_tolower(buf[i]);
442 QTAILQ_INIT(&bus->children);
444 QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
445 parent->num_child_bus++;
446 } else if (bus != main_system_bus) {
447 /* TODO: once all bus devices are qdevified,
448 only reset handler for main_system_bus should be registered here. */
449 qemu_register_reset(qbus_reset_all_fn, bus);
453 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
457 bus = g_malloc0(info->size);
458 bus->qdev_allocated = 1;
459 qbus_create_inplace(bus, info, parent, name);
463 static void main_system_bus_create(void)
465 /* assign main_system_bus before qbus_create_inplace()
466 * in order to make "if (bus != main_system_bus)" work */
467 main_system_bus = g_malloc0(system_bus_info.size);
468 main_system_bus->qdev_allocated = 1;
469 qbus_create_inplace(main_system_bus, &system_bus_info, NULL,
473 void qbus_free(BusState *bus)
477 while ((dev = QTAILQ_FIRST(&bus->children)) != NULL) {
481 QLIST_REMOVE(bus, sibling);
482 bus->parent->num_child_bus--;
484 assert(bus != main_system_bus); /* main_system_bus is never freed */
485 qemu_unregister_reset(qbus_reset_all_fn, bus);
487 g_free((void*)bus->name);
488 if (bus->qdev_allocated) {
493 static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
497 if (dev && dev->parent_bus) {
499 l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
500 if (dev->parent_bus->info->get_fw_dev_path) {
501 d = dev->parent_bus->info->get_fw_dev_path(dev);
502 l += snprintf(p + l, size - l, "%s", d);
505 l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
508 l += snprintf(p + l , size - l, "/");
513 char* qdev_get_fw_dev_path(DeviceState *dev)
518 l = qdev_get_fw_dev_path_helper(dev, path, 128);
525 static char *qdev_get_type(Object *obj, Error **errp)
527 return g_strdup(object_get_typename(obj));
531 * Legacy property handling
534 static void qdev_get_legacy_property(Object *obj, Visitor *v, void *opaque,
535 const char *name, Error **errp)
537 DeviceState *dev = DEVICE(obj);
538 Property *prop = opaque;
543 prop->info->print(dev, prop, buffer, sizeof(buffer));
544 visit_type_str(v, &ptr, name, errp);
547 static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
548 const char *name, Error **errp)
550 DeviceState *dev = DEVICE(obj);
551 Property *prop = opaque;
552 Error *local_err = NULL;
556 if (dev->state != DEV_STATE_CREATED) {
557 error_set(errp, QERR_PERMISSION_DENIED);
561 visit_type_str(v, &ptr, name, &local_err);
563 error_propagate(errp, local_err);
567 ret = prop->info->parse(dev, prop, ptr);
568 error_set_from_qdev_prop_error(errp, ret, dev, prop, ptr);
573 * @qdev_add_legacy_property - adds a legacy property
575 * Do not use this is new code! Properties added through this interface will
576 * be given names and types in the "legacy" namespace.
578 * Legacy properties are always processed as strings. The format of the string
579 * depends on the property type.
581 void qdev_property_add_legacy(DeviceState *dev, Property *prop,
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 : NULL,
592 prop->info->parse ? qdev_set_legacy_property : NULL,
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,
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 qdev_prop_set_defaults(dev, qdev_get_props(dev));
629 for (prop = qdev_get_props(dev); prop && prop->name; prop++) {
630 qdev_property_add_legacy(dev, prop, NULL);
631 qdev_property_add_static(dev, prop, NULL);
634 object_property_add_str(OBJECT(dev), "type", qdev_get_type, NULL, NULL);
637 void device_reset(DeviceState *dev)
639 DeviceClass *klass = DEVICE_GET_CLASS(dev);
646 static TypeInfo device_type_info = {
648 .parent = TYPE_OBJECT,
649 .instance_size = sizeof(DeviceState),
650 .instance_init = device_initfn,
652 .class_size = sizeof(DeviceClass),
655 static void init_qdev(void)
657 type_register_static(&device_type_info);
660 device_init(init_qdev);