hw/qdev.c

   1 /*
   2  *  Dynamic device configuration and creation.
   3  *
   4  *  Copyright (c) 2009 CodeSourcery
   5  *
   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.
  10  *
  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.
  15  *
  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/>.
  18  */
  19
  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
  26    this API directly.  */
  27
  28 #include "net.h"
  29 #include "qdev.h"
  30 #include "sysemu.h"
  31 #include "error.h"
  32
  33 int qdev_hotplug = 0;
  34 static bool qdev_hot_added = false;
  35 static bool qdev_hot_removed = false;
  36
  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);
  40
  41 /* Register a new device type.  */
  42 const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
  43 {
  44     DeviceClass *dc = DEVICE_GET_CLASS(dev);
  45     return dc->vmsd;
  46 }
  47
  48 BusInfo *qdev_get_bus_info(DeviceState *dev)
  49 {
  50     DeviceClass *dc = DEVICE_GET_CLASS(dev);
  51     return dc->bus_info;
  52 }
  53
  54 Property *qdev_get_props(DeviceState *dev)
  55 {
  56     DeviceClass *dc = DEVICE_GET_CLASS(dev);
  57     return dc->props;
  58 }
  59
  60 const char *qdev_fw_name(DeviceState *dev)
  61 {
  62     DeviceClass *dc = DEVICE_GET_CLASS(dev);
  63
  64     if (dc->fw_name) {
  65         return dc->fw_name;
  66     }
  67
  68     return object_get_typename(OBJECT(dev));
  69 }
  70
  71 bool qdev_exists(const char *name)
  72 {
  73     return !!object_class_by_name(name);
  74 }
  75
  76 static void qdev_property_add_legacy(DeviceState *dev, Property *prop,
  77                                      Error **errp);
  78
  79 void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
  80 {
  81     Property *prop;
  82
  83     if (qdev_hotplug) {
  84         assert(bus->allow_hotplug);
  85     }
  86
  87     dev->parent_bus = bus;
  88     QTAILQ_INSERT_HEAD(&bus->children, dev, sibling);
  89
  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);
  93     }
  94     qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
  95 }
  96
  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)
 101 {
 102     DeviceState *dev;
 103
 104     dev = qdev_try_create(bus, name);
 105     if (!dev) {
 106         if (bus) {
 107             hw_error("Unknown device '%s' for bus '%s'\n", name,
 108                      bus->info->name);
 109         } else {
 110             hw_error("Unknown device '%s' for default sysbus\n", name);
 111         }
 112     }
 113
 114     return dev;
 115 }
 116
 117 DeviceState *qdev_try_create(BusState *bus, const char *type)
 118 {
 119     DeviceState *dev;
 120
 121     if (object_class_by_name(type) == NULL) {
 122         return NULL;
 123     }
 124     dev = DEVICE(object_new(type));
 125     if (!dev) {
 126         return NULL;
 127     }
 128
 129     if (!bus) {
 130         bus = sysbus_get_default();
 131     }
 132
 133     qdev_set_parent_bus(dev, bus);
 134     qdev_prop_set_globals(dev);
 135
 136     return dev;
 137 }
 138
 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)
 145 {
 146     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 147     int rc;
 148
 149     assert(dev->state == DEV_STATE_CREATED);
 150
 151     rc = dc->init(dev);
 152     if (rc < 0) {
 153         qdev_free(dev);
 154         return rc;
 155     }
 156
 157     if (!OBJECT(dev)->parent) {
 158         static int unattached_count = 0;
 159         gchar *name = g_strdup_printf("device[%d]", unattached_count++);
 160
 161         object_property_add_child(container_get(qdev_get_machine(),
 162                                                 "/unattached"),
 163                                   name, OBJECT(dev), NULL);
 164         g_free(name);
 165     }
 166
 167     if (qdev_get_vmsd(dev)) {
 168         vmstate_register_with_alias_id(dev, -1, qdev_get_vmsd(dev), dev,
 169                                        dev->instance_id_alias,
 170                                        dev->alias_required_for_version);
 171     }
 172     dev->state = DEV_STATE_INITIALIZED;
 173     if (dev->hotplugged) {
 174         device_reset(dev);
 175     }
 176     return 0;
 177 }
 178
 179 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
 180                                  int required_for_version)
 181 {
 182     assert(dev->state == DEV_STATE_CREATED);
 183     dev->instance_id_alias = alias_id;
 184     dev->alias_required_for_version = required_for_version;
 185 }
 186
 187 void qdev_unplug(DeviceState *dev, Error **errp)
 188 {
 189     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 190
 191     if (!dev->parent_bus->allow_hotplug) {
 192         error_set(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 193         return;
 194     }
 195     assert(dc->unplug != NULL);
 196
 197     qdev_hot_removed = true;
 198
 199     if (dc->unplug(dev) < 0) {
 200         error_set(errp, QERR_UNDEFINED_ERROR);
 201         return;
 202     }
 203 }
 204
 205 static int qdev_reset_one(DeviceState *dev, void *opaque)
 206 {
 207     device_reset(dev);
 208
 209     return 0;
 210 }
 211
 212 BusState *sysbus_get_default(void)
 213 {
 214     if (!main_system_bus) {
 215         main_system_bus_create();
 216     }
 217     return main_system_bus;
 218 }
 219
 220 static int qbus_reset_one(BusState *bus, void *opaque)
 221 {
 222     if (bus->info->reset) {
 223         return bus->info->reset(bus);
 224     }
 225     return 0;
 226 }
 227
 228 void qdev_reset_all(DeviceState *dev)
 229 {
 230     qdev_walk_children(dev, qdev_reset_one, qbus_reset_one, NULL);
 231 }
 232
 233 void qbus_reset_all_fn(void *opaque)
 234 {
 235     BusState *bus = opaque;
 236     qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
 237 }
 238
 239 /* can be used as ->unplug() callback for the simple cases */
 240 int qdev_simple_unplug_cb(DeviceState *dev)
 241 {
 242     /* just zap it */
 243     object_unparent(OBJECT(dev));
 244     qdev_free(dev);
 245     return 0;
 246 }
 247
 248
 249 /* Like qdev_init(), but terminate program via error_report() instead of
 250    returning an error value.  This is okay during machine creation.
 251    Don't use for hotplug, because there callers need to recover from
 252    failure.  Exception: if you know the device's init() callback can't
 253    fail, then qdev_init_nofail() can't fail either, and is therefore
 254    usable even then.  But relying on the device implementation that
 255    way is somewhat unclean, and best avoided.  */
 256 void qdev_init_nofail(DeviceState *dev)
 257 {
 258     if (qdev_init(dev) < 0) {
 259         error_report("Initialization of device %s failed",
 260                      object_get_typename(OBJECT(dev)));
 261         exit(1);
 262     }
 263 }
 264
 265 /* Unlink device from bus and free the structure.  */
 266 void qdev_free(DeviceState *dev)
 267 {
 268     object_delete(OBJECT(dev));
 269 }
 270
 271 void qdev_machine_creation_done(void)
 272 {
 273     /*
 274      * ok, initial machine setup is done, starting from now we can
 275      * only create hotpluggable devices
 276      */
 277     qdev_hotplug = 1;
 278 }
 279
 280 bool qdev_machine_modified(void)
 281 {
 282     return qdev_hot_added || qdev_hot_removed;
 283 }
 284
 285 BusState *qdev_get_parent_bus(DeviceState *dev)
 286 {
 287     return dev->parent_bus;
 288 }
 289
 290 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
 291 {
 292     assert(dev->num_gpio_in == 0);
 293     dev->num_gpio_in = n;
 294     dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
 295 }
 296
 297 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
 298 {
 299     assert(dev->num_gpio_out == 0);
 300     dev->num_gpio_out = n;
 301     dev->gpio_out = pins;
 302 }
 303
 304 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
 305 {
 306     assert(n >= 0 && n < dev->num_gpio_in);
 307     return dev->gpio_in[n];
 308 }
 309
 310 void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
 311 {
 312     assert(n >= 0 && n < dev->num_gpio_out);
 313     dev->gpio_out[n] = pin;
 314 }
 315
 316 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 317 {
 318     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
 319     if (nd->vlan)
 320         qdev_prop_set_vlan(dev, "vlan", nd->vlan);
 321     if (nd->netdev)
 322         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
 323     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 324         qdev_prop_exists(dev, "vectors")) {
 325         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
 326     }
 327     nd->instantiated = 1;
 328 }
 329
 330 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
 331 {
 332     BusState *bus;
 333
 334     QLIST_FOREACH(bus, &dev->child_bus, sibling) {
 335         if (strcmp(name, bus->name) == 0) {
 336             return bus;
 337         }
 338     }
 339     return NULL;
 340 }
 341
 342 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
 343                        qbus_walkerfn *busfn, void *opaque)
 344 {
 345     DeviceState *dev;
 346     int err;
 347
 348     if (busfn) {
 349         err = busfn(bus, opaque);
 350         if (err) {
 351             return err;
 352         }
 353     }
 354
 355     QTAILQ_FOREACH(dev, &bus->children, sibling) {
 356         err = qdev_walk_children(dev, devfn, busfn, opaque);
 357         if (err < 0) {
 358             return err;
 359         }
 360     }
 361
 362     return 0;
 363 }
 364
 365 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
 366                        qbus_walkerfn *busfn, void *opaque)
 367 {
 368     BusState *bus;
 369     int err;
 370
 371     if (devfn) {
 372         err = devfn(dev, opaque);
 373         if (err) {
 374             return err;
 375         }
 376     }
 377
 378     QLIST_FOREACH(bus, &dev->child_bus, sibling) {
 379         err = qbus_walk_children(bus, devfn, busfn, opaque);
 380         if (err < 0) {
 381             return err;
 382         }
 383     }
 384
 385     return 0;
 386 }
 387
 388 DeviceState *qdev_find_recursive(BusState *bus, const char *id)
 389 {
 390     DeviceState *dev, *ret;
 391     BusState *child;
 392
 393     QTAILQ_FOREACH(dev, &bus->children, sibling) {
 394         if (dev->id && strcmp(dev->id, id) == 0)
 395             return dev;
 396         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 397             ret = qdev_find_recursive(child, id);
 398             if (ret) {
 399                 return ret;
 400             }
 401         }
 402     }
 403     return NULL;
 404 }
 405
 406 void qbus_create_inplace(BusState *bus, BusInfo *info,
 407                          DeviceState *parent, const char *name)
 408 {
 409     char *buf;
 410     int i,len;
 411
 412     bus->info = info;
 413     bus->parent = parent;
 414
 415     if (name) {
 416         /* use supplied name */
 417         bus->name = g_strdup(name);
 418     } else if (parent && parent->id) {
 419         /* parent device has id -> use it for bus name */
 420         len = strlen(parent->id) + 16;
 421         buf = g_malloc(len);
 422         snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
 423         bus->name = buf;
 424     } else {
 425         /* no id -> use lowercase bus type for bus name */
 426         len = strlen(info->name) + 16;
 427         buf = g_malloc(len);
 428         len = snprintf(buf, len, "%s.%d", info->name,
 429                        parent ? parent->num_child_bus : 0);
 430         for (i = 0; i < len; i++)
 431             buf[i] = qemu_tolower(buf[i]);
 432         bus->name = buf;
 433     }
 434
 435     QTAILQ_INIT(&bus->children);
 436     if (parent) {
 437         QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
 438         parent->num_child_bus++;
 439     } else if (bus != main_system_bus) {
 440         /* TODO: once all bus devices are qdevified,
 441            only reset handler for main_system_bus should be registered here. */
 442         qemu_register_reset(qbus_reset_all_fn, bus);
 443     }
 444 }
 445
 446 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
 447 {
 448     BusState *bus;
 449
 450     bus = g_malloc0(info->size);
 451     bus->qdev_allocated = 1;
 452     qbus_create_inplace(bus, info, parent, name);
 453     return bus;
 454 }
 455
 456 static void main_system_bus_create(void)
 457 {
 458     /* assign main_system_bus before qbus_create_inplace()
 459      * in order to make "if (bus != main_system_bus)" work */
 460     main_system_bus = g_malloc0(system_bus_info.size);
 461     main_system_bus->qdev_allocated = 1;
 462     qbus_create_inplace(main_system_bus, &system_bus_info, NULL,
 463                         "main-system-bus");
 464 }
 465
 466 void qbus_free(BusState *bus)
 467 {
 468     DeviceState *dev;
 469
 470     while ((dev = QTAILQ_FIRST(&bus->children)) != NULL) {
 471         qdev_free(dev);
 472     }
 473     if (bus->parent) {
 474         QLIST_REMOVE(bus, sibling);
 475         bus->parent->num_child_bus--;
 476     } else {
 477         assert(bus != main_system_bus); /* main_system_bus is never freed */
 478         qemu_unregister_reset(qbus_reset_all_fn, bus);
 479     }
 480     g_free((void*)bus->name);
 481     if (bus->qdev_allocated) {
 482         g_free(bus);
 483     }
 484 }
 485
 486 static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
 487 {
 488     int l = 0;
 489
 490     if (dev && dev->parent_bus) {
 491         char *d;
 492         l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
 493         if (dev->parent_bus->info->get_fw_dev_path) {
 494             d = dev->parent_bus->info->get_fw_dev_path(dev);
 495             l += snprintf(p + l, size - l, "%s", d);
 496             g_free(d);
 497         } else {
 498             l += snprintf(p + l, size - l, "%s", object_get_typename(OBJECT(dev)));
 499         }
 500     }
 501     l += snprintf(p + l , size - l, "/");
 502
 503     return l;
 504 }
 505
 506 char* qdev_get_fw_dev_path(DeviceState *dev)
 507 {
 508     char path[128];
 509     int l;
 510
 511     l = qdev_get_fw_dev_path_helper(dev, path, 128);
 512
 513     path[l-1] = '\0';
 514
 515     return strdup(path);
 516 }
 517
 518 static char *qdev_get_type(Object *obj, Error **errp)
 519 {
 520     return g_strdup(object_get_typename(obj));
 521 }
 522
 523 /**
 524  * Legacy property handling
 525  */
 526
 527 static void qdev_get_legacy_property(Object *obj, Visitor *v, void *opaque,
 528                                      const char *name, Error **errp)
 529 {
 530     DeviceState *dev = DEVICE(obj);
 531     Property *prop = opaque;
 532
 533     char buffer[1024];
 534     char *ptr = buffer;
 535
 536     prop->info->print(dev, prop, buffer, sizeof(buffer));
 537     visit_type_str(v, &ptr, name, errp);
 538 }
 539
 540 static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
 541                                      const char *name, Error **errp)
 542 {
 543     DeviceState *dev = DEVICE(obj);
 544     Property *prop = opaque;
 545     Error *local_err = NULL;
 546     char *ptr = NULL;
 547     int ret;
 548
 549     if (dev->state != DEV_STATE_CREATED) {
 550         error_set(errp, QERR_PERMISSION_DENIED);
 551         return;
 552     }
 553
 554     visit_type_str(v, &ptr, name, &local_err);
 555     if (local_err) {
 556         error_propagate(errp, local_err);
 557         return;
 558     }
 559
 560     ret = prop->info->parse(dev, prop, ptr);
 561     error_set_from_qdev_prop_error(errp, ret, dev, prop, ptr);
 562     g_free(ptr);
 563 }
 564
 565 /**
 566  * @qdev_add_legacy_property - adds a legacy property
 567  *
 568  * Do not use this is new code!  Properties added through this interface will
 569  * be given names and types in the "legacy" namespace.
 570  *
 571  * Legacy properties are string versions of other OOM properties.  The format
 572  * of the string depends on the property type.
 573  */
 574 void qdev_property_add_legacy(DeviceState *dev, Property *prop,
 575                               Error **errp)
 576 {
 577     gchar *name, *type;
 578
 579     if (!prop->info->print && !prop->info->parse) {
 580         return;
 581     }
 582     name = g_strdup_printf("legacy-%s", prop->name);
 583     type = g_strdup_printf("legacy<%s>",
 584                            prop->info->legacy_name ?: prop->info->name);
 585
 586     object_property_add(OBJECT(dev), name, type,
 587                         prop->info->print ? qdev_get_legacy_property : prop->info->get,
 588                         prop->info->parse ? qdev_set_legacy_property : prop->info->set,
 589                         NULL,
 590                         prop, errp);
 591
 592     g_free(type);
 593     g_free(name);
 594 }
 595
 596 /**
 597  * @qdev_property_add_static - add a @Property to a device.
 598  *
 599  * Static properties access data in a struct.  The actual type of the
 600  * property and the field depends on the property type.
 601  */
 602 void qdev_property_add_static(DeviceState *dev, Property *prop,
 603                               Error **errp)
 604 {
 605     /*
 606      * TODO qdev_prop_ptr does not have getters or setters.  It must
 607      * go now that it can be replaced with links.  The test should be
 608      * removed along with it: all static properties are read/write.
 609      */
 610     if (!prop->info->get && !prop->info->set) {
 611         return;
 612     }
 613
 614     object_property_add(OBJECT(dev), prop->name, prop->info->name,
 615                         prop->info->get, prop->info->set,
 616                         prop->info->release,
 617                         prop, errp);
 618 }
 619
 620 static void device_initfn(Object *obj)
 621 {
 622     DeviceState *dev = DEVICE(obj);
 623     Property *prop;
 624
 625     if (qdev_hotplug) {
 626         dev->hotplugged = 1;
 627         qdev_hot_added = true;
 628     }
 629
 630     dev->instance_id_alias = -1;
 631     dev->state = DEV_STATE_CREATED;
 632
 633     for (prop = qdev_get_props(dev); prop && prop->name; prop++) {
 634         qdev_property_add_legacy(dev, prop, NULL);
 635         qdev_property_add_static(dev, prop, NULL);
 636     }
 637
 638     object_property_add_str(OBJECT(dev), "type", qdev_get_type, NULL, NULL);
 639     qdev_prop_set_defaults(dev, qdev_get_props(dev));
 640 }
 641
 642 /* Unlink device from bus and free the structure.  */
 643 static void device_finalize(Object *obj)
 644 {
 645     DeviceState *dev = DEVICE(obj);
 646     BusState *bus;
 647     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 648
 649     if (dev->state == DEV_STATE_INITIALIZED) {
 650         while (dev->num_child_bus) {
 651             bus = QLIST_FIRST(&dev->child_bus);
 652             qbus_free(bus);
 653         }
 654         if (qdev_get_vmsd(dev)) {
 655             vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
 656         }
 657         if (dc->exit) {
 658             dc->exit(dev);
 659         }
 660         if (dev->opts) {
 661             qemu_opts_del(dev->opts);
 662         }
 663     }
 664     QTAILQ_REMOVE(&dev->parent_bus->children, dev, sibling);
 665 }
 666
 667 void device_reset(DeviceState *dev)
 668 {
 669     DeviceClass *klass = DEVICE_GET_CLASS(dev);
 670
 671     if (klass->reset) {
 672         klass->reset(dev);
 673     }
 674 }
 675
 676 Object *qdev_get_machine(void)
 677 {
 678     static Object *dev;
 679
 680     if (dev == NULL) {
 681         dev = container_get(object_get_root(), "/machine");
 682     }
 683
 684     return dev;
 685 }
 686
 687 static TypeInfo device_type_info = {
 688     .name = TYPE_DEVICE,
 689     .parent = TYPE_OBJECT,
 690     .instance_size = sizeof(DeviceState),
 691     .instance_init = device_initfn,
 692     .instance_finalize = device_finalize,
 693     .abstract = true,
 694     .class_size = sizeof(DeviceClass),
 695 };
 696
 697 static void qdev_register_types(void)
 698 {
 699     type_register_static(&device_type_info);
 700 }
 701
 702 type_init(qdev_register_types)