softmmu/qdev-monitor.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 2.1 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 #include "qemu/osdep.h"
  21 #include "hw/sysbus.h"
  22 #include "monitor/hmp.h"
  23 #include "monitor/monitor.h"
  24 #include "monitor/qdev.h"
  25 #include "sysemu/arch_init.h"
  26 #include "qapi/error.h"
  27 #include "qapi/qapi-commands-qdev.h"
  28 #include "qapi/qmp/qdict.h"
  29 #include "qapi/qmp/qerror.h"
  30 #include "qemu/config-file.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/help_option.h"
  33 #include "qemu/option.h"
  34 #include "qemu/qemu-print.h"
  35 #include "qemu/option_int.h"
  36 #include "sysemu/block-backend.h"
  37 #include "sysemu/sysemu.h"
  38 #include "migration/misc.h"
  39 #include "migration/migration.h"
  40 #include "qemu/cutils.h"
  41 #include "hw/qdev-properties.h"
  42 #include "hw/clock.h"
  43
  44 /*
  45  * Aliases were a bad idea from the start.  Let's keep them
  46  * from spreading further.
  47  */
  48 typedef struct QDevAlias
  49 {
  50     const char *typename;
  51     const char *alias;
  52     uint32_t arch_mask;
  53 } QDevAlias;
  54
  55 /* Please keep this table sorted by typename. */
  56 static const QDevAlias qdev_alias_table[] = {
  57     { "AC97", "ac97" }, /* -soundhw name */
  58     { "e1000", "e1000-82540em" },
  59     { "ES1370", "es1370" }, /* -soundhw name */
  60     { "ich9-ahci", "ahci" },
  61     { "lsi53c895a", "lsi" },
  62     { "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_S390X },
  63     { "virtio-9p-pci", "virtio-9p", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  64     { "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_S390X },
  65     { "virtio-balloon-pci", "virtio-balloon",
  66             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  67     { "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_S390X },
  68     { "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  69     { "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_S390X },
  70     { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  71     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_S390X },
  72     { "virtio-input-host-pci", "virtio-input-host",
  73             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  74     { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  75     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_S390X },
  76     { "virtio-keyboard-pci", "virtio-keyboard",
  77             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  78     { "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_S390X },
  79     { "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  80     { "virtio-net-ccw", "virtio-net", QEMU_ARCH_S390X },
  81     { "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  82     { "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_S390X },
  83     { "virtio-rng-pci", "virtio-rng", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  84     { "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_S390X },
  85     { "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  86     { "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_S390X },
  87     { "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  88     { "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_S390X },
  89     { "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
  90     { }
  91 };
  92
  93 static const char *qdev_class_get_alias(DeviceClass *dc)
  94 {
  95     const char *typename = object_class_get_name(OBJECT_CLASS(dc));
  96     int i;
  97
  98     for (i = 0; qdev_alias_table[i].typename; i++) {
  99         if (qdev_alias_table[i].arch_mask &&
 100             !(qdev_alias_table[i].arch_mask & arch_type)) {
 101             continue;
 102         }
 103
 104         if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
 105             return qdev_alias_table[i].alias;
 106         }
 107     }
 108
 109     return NULL;
 110 }
 111
 112 static bool qdev_class_has_alias(DeviceClass *dc)
 113 {
 114     return (qdev_class_get_alias(dc) != NULL);
 115 }
 116
 117 static void qdev_print_devinfo(DeviceClass *dc)
 118 {
 119     qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
 120     if (dc->bus_type) {
 121         qemu_printf(", bus %s", dc->bus_type);
 122     }
 123     if (qdev_class_has_alias(dc)) {
 124         qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
 125     }
 126     if (dc->desc) {
 127         qemu_printf(", desc \"%s\"", dc->desc);
 128     }
 129     if (!dc->user_creatable) {
 130         qemu_printf(", no-user");
 131     }
 132     qemu_printf("\n");
 133 }
 134
 135 static void qdev_print_devinfos(bool show_no_user)
 136 {
 137     static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
 138         [DEVICE_CATEGORY_BRIDGE]  = "Controller/Bridge/Hub",
 139         [DEVICE_CATEGORY_USB]     = "USB",
 140         [DEVICE_CATEGORY_STORAGE] = "Storage",
 141         [DEVICE_CATEGORY_NETWORK] = "Network",
 142         [DEVICE_CATEGORY_INPUT]   = "Input",
 143         [DEVICE_CATEGORY_DISPLAY] = "Display",
 144         [DEVICE_CATEGORY_SOUND]   = "Sound",
 145         [DEVICE_CATEGORY_MISC]    = "Misc",
 146         [DEVICE_CATEGORY_CPU]     = "CPU",
 147         [DEVICE_CATEGORY_MAX]     = "Uncategorized",
 148     };
 149     GSList *list, *elt;
 150     int i;
 151     bool cat_printed;
 152
 153     module_load_qom_all();
 154     list = object_class_get_list_sorted(TYPE_DEVICE, false);
 155
 156     for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
 157         cat_printed = false;
 158         for (elt = list; elt; elt = elt->next) {
 159             DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
 160                                                  TYPE_DEVICE);
 161             if ((i < DEVICE_CATEGORY_MAX
 162                  ? !test_bit(i, dc->categories)
 163                  : !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
 164                 || (!show_no_user
 165                     && !dc->user_creatable)) {
 166                 continue;
 167             }
 168             if (!cat_printed) {
 169                 qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
 170                 cat_printed = true;
 171             }
 172             qdev_print_devinfo(dc);
 173         }
 174     }
 175
 176     g_slist_free(list);
 177 }
 178
 179 static int set_property(void *opaque, const char *name, const char *value,
 180                         Error **errp)
 181 {
 182     Object *obj = opaque;
 183
 184     if (strcmp(name, "driver") == 0)
 185         return 0;
 186     if (strcmp(name, "bus") == 0)
 187         return 0;
 188
 189     if (!object_property_parse(obj, name, value, errp)) {
 190         return -1;
 191     }
 192     return 0;
 193 }
 194
 195 static const char *find_typename_by_alias(const char *alias)
 196 {
 197     int i;
 198
 199     for (i = 0; qdev_alias_table[i].alias; i++) {
 200         if (qdev_alias_table[i].arch_mask &&
 201             !(qdev_alias_table[i].arch_mask & arch_type)) {
 202             continue;
 203         }
 204
 205         if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
 206             return qdev_alias_table[i].typename;
 207         }
 208     }
 209
 210     return NULL;
 211 }
 212
 213 static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
 214 {
 215     ObjectClass *oc;
 216     DeviceClass *dc;
 217     const char *original_name = *driver;
 218
 219     oc = module_object_class_by_name(*driver);
 220     if (!oc) {
 221         const char *typename = find_typename_by_alias(*driver);
 222
 223         if (typename) {
 224             *driver = typename;
 225             oc = module_object_class_by_name(*driver);
 226         }
 227     }
 228
 229     if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
 230         if (*driver != original_name) {
 231             error_setg(errp, "'%s' (alias '%s') is not a valid device model"
 232                        " name", original_name, *driver);
 233         } else {
 234             error_setg(errp, "'%s' is not a valid device model name", *driver);
 235         }
 236         return NULL;
 237     }
 238
 239     if (object_class_is_abstract(oc)) {
 240         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 241                    "a non-abstract device type");
 242         return NULL;
 243     }
 244
 245     dc = DEVICE_CLASS(oc);
 246     if (!dc->user_creatable ||
 247         (qdev_hotplug && !dc->hotpluggable)) {
 248         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
 249                    "a pluggable device type");
 250         return NULL;
 251     }
 252
 253     return dc;
 254 }
 255
 256
 257 int qdev_device_help(QemuOpts *opts)
 258 {
 259     Error *local_err = NULL;
 260     const char *driver;
 261     ObjectPropertyInfoList *prop_list;
 262     ObjectPropertyInfoList *prop;
 263     GPtrArray *array;
 264     int i;
 265
 266     driver = qemu_opt_get(opts, "driver");
 267     if (driver && is_help_option(driver)) {
 268         qdev_print_devinfos(false);
 269         return 1;
 270     }
 271
 272     if (!driver || !qemu_opt_has_help_opt(opts)) {
 273         return 0;
 274     }
 275
 276     if (!object_class_by_name(driver)) {
 277         const char *typename = find_typename_by_alias(driver);
 278
 279         if (typename) {
 280             driver = typename;
 281         }
 282     }
 283
 284     prop_list = qmp_device_list_properties(driver, &local_err);
 285     if (local_err) {
 286         goto error;
 287     }
 288
 289     if (prop_list) {
 290         qemu_printf("%s options:\n", driver);
 291     } else {
 292         qemu_printf("There are no options for %s.\n", driver);
 293     }
 294     array = g_ptr_array_new();
 295     for (prop = prop_list; prop; prop = prop->next) {
 296         g_ptr_array_add(array,
 297                         object_property_help(prop->value->name,
 298                                              prop->value->type,
 299                                              prop->value->default_value,
 300                                              prop->value->description));
 301     }
 302     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 303     for (i = 0; i < array->len; i++) {
 304         qemu_printf("%s\n", (char *)array->pdata[i]);
 305     }
 306     g_ptr_array_set_free_func(array, g_free);
 307     g_ptr_array_free(array, true);
 308     qapi_free_ObjectPropertyInfoList(prop_list);
 309     return 1;
 310
 311 error:
 312     error_report_err(local_err);
 313     return 1;
 314 }
 315
 316 static Object *qdev_get_peripheral(void)
 317 {
 318     static Object *dev;
 319
 320     if (dev == NULL) {
 321         dev = container_get(qdev_get_machine(), "/peripheral");
 322     }
 323
 324     return dev;
 325 }
 326
 327 static Object *qdev_get_peripheral_anon(void)
 328 {
 329     static Object *dev;
 330
 331     if (dev == NULL) {
 332         dev = container_get(qdev_get_machine(), "/peripheral-anon");
 333     }
 334
 335     return dev;
 336 }
 337
 338 static void qbus_error_append_bus_list_hint(DeviceState *dev,
 339                                             Error *const *errp)
 340 {
 341     BusState *child;
 342     const char *sep = " ";
 343
 344     error_append_hint(errp, "child buses at \"%s\":",
 345                       dev->id ? dev->id : object_get_typename(OBJECT(dev)));
 346     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 347         error_append_hint(errp, "%s\"%s\"", sep, child->name);
 348         sep = ", ";
 349     }
 350     error_append_hint(errp, "\n");
 351 }
 352
 353 static void qbus_error_append_dev_list_hint(BusState *bus,
 354                                             Error *const *errp)
 355 {
 356     BusChild *kid;
 357     const char *sep = " ";
 358
 359     error_append_hint(errp, "devices at \"%s\":", bus->name);
 360     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 361         DeviceState *dev = kid->child;
 362         error_append_hint(errp, "%s\"%s\"", sep,
 363                           object_get_typename(OBJECT(dev)));
 364         if (dev->id) {
 365             error_append_hint(errp, "/\"%s\"", dev->id);
 366         }
 367         sep = ", ";
 368     }
 369     error_append_hint(errp, "\n");
 370 }
 371
 372 static BusState *qbus_find_bus(DeviceState *dev, char *elem)
 373 {
 374     BusState *child;
 375
 376     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 377         if (strcmp(child->name, elem) == 0) {
 378             return child;
 379         }
 380     }
 381     return NULL;
 382 }
 383
 384 static DeviceState *qbus_find_dev(BusState *bus, char *elem)
 385 {
 386     BusChild *kid;
 387
 388     /*
 389      * try to match in order:
 390      *   (1) instance id, if present
 391      *   (2) driver name
 392      *   (3) driver alias, if present
 393      */
 394     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 395         DeviceState *dev = kid->child;
 396         if (dev->id  &&  strcmp(dev->id, elem) == 0) {
 397             return dev;
 398         }
 399     }
 400     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 401         DeviceState *dev = kid->child;
 402         if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
 403             return dev;
 404         }
 405     }
 406     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 407         DeviceState *dev = kid->child;
 408         DeviceClass *dc = DEVICE_GET_CLASS(dev);
 409
 410         if (qdev_class_has_alias(dc) &&
 411             strcmp(qdev_class_get_alias(dc), elem) == 0) {
 412             return dev;
 413         }
 414     }
 415     return NULL;
 416 }
 417
 418 static inline bool qbus_is_full(BusState *bus)
 419 {
 420     BusClass *bus_class = BUS_GET_CLASS(bus);
 421     return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
 422 }
 423
 424 /*
 425  * Search the tree rooted at @bus for a bus.
 426  * If @name, search for a bus with that name.  Note that bus names
 427  * need not be unique.  Yes, that's screwed up.
 428  * Else search for a bus that is a subtype of @bus_typename.
 429  * If more than one exists, prefer one that can take another device.
 430  * Return the bus if found, else %NULL.
 431  */
 432 static BusState *qbus_find_recursive(BusState *bus, const char *name,
 433                                      const char *bus_typename)
 434 {
 435     BusChild *kid;
 436     BusState *pick, *child, *ret;
 437     bool match;
 438
 439     assert(name || bus_typename);
 440     if (name) {
 441         match = !strcmp(bus->name, name);
 442     } else {
 443         match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
 444     }
 445
 446     if (match && !qbus_is_full(bus)) {
 447         return bus;             /* root matches and isn't full */
 448     }
 449
 450     pick = match ? bus : NULL;
 451
 452     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 453         DeviceState *dev = kid->child;
 454         QLIST_FOREACH(child, &dev->child_bus, sibling) {
 455             ret = qbus_find_recursive(child, name, bus_typename);
 456             if (ret && !qbus_is_full(ret)) {
 457                 return ret;     /* a descendant matches and isn't full */
 458             }
 459             if (ret && !pick) {
 460                 pick = ret;
 461             }
 462         }
 463     }
 464
 465     /* root or a descendant matches, but is full */
 466     return pick;
 467 }
 468
 469 static BusState *qbus_find(const char *path, Error **errp)
 470 {
 471     DeviceState *dev;
 472     BusState *bus;
 473     char elem[128];
 474     int pos, len;
 475
 476     /* find start element */
 477     if (path[0] == '/') {
 478         bus = sysbus_get_default();
 479         pos = 0;
 480     } else {
 481         if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
 482             assert(!path[0]);
 483             elem[0] = len = 0;
 484         }
 485         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
 486         if (!bus) {
 487             error_setg(errp, "Bus '%s' not found", elem);
 488             return NULL;
 489         }
 490         pos = len;
 491     }
 492
 493     for (;;) {
 494         assert(path[pos] == '/' || !path[pos]);
 495         while (path[pos] == '/') {
 496             pos++;
 497         }
 498         if (path[pos] == '\0') {
 499             break;
 500         }
 501
 502         /* find device */
 503         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 504             g_assert_not_reached();
 505             elem[0] = len = 0;
 506         }
 507         pos += len;
 508         dev = qbus_find_dev(bus, elem);
 509         if (!dev) {
 510             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 511                       "Device '%s' not found", elem);
 512             qbus_error_append_dev_list_hint(bus, errp);
 513             return NULL;
 514         }
 515
 516         assert(path[pos] == '/' || !path[pos]);
 517         while (path[pos] == '/') {
 518             pos++;
 519         }
 520         if (path[pos] == '\0') {
 521             /* last specified element is a device.  If it has exactly
 522              * one child bus accept it nevertheless */
 523             if (dev->num_child_bus == 1) {
 524                 bus = QLIST_FIRST(&dev->child_bus);
 525                 break;
 526             }
 527             if (dev->num_child_bus) {
 528                 error_setg(errp, "Device '%s' has multiple child buses",
 529                            elem);
 530                 qbus_error_append_bus_list_hint(dev, errp);
 531             } else {
 532                 error_setg(errp, "Device '%s' has no child bus", elem);
 533             }
 534             return NULL;
 535         }
 536
 537         /* find bus */
 538         if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
 539             g_assert_not_reached();
 540             elem[0] = len = 0;
 541         }
 542         pos += len;
 543         bus = qbus_find_bus(dev, elem);
 544         if (!bus) {
 545             error_setg(errp, "Bus '%s' not found", elem);
 546             qbus_error_append_bus_list_hint(dev, errp);
 547             return NULL;
 548         }
 549     }
 550
 551     if (qbus_is_full(bus)) {
 552         error_setg(errp, "Bus '%s' is full", path);
 553         return NULL;
 554     }
 555     return bus;
 556 }
 557
 558 void qdev_set_id(DeviceState *dev, const char *id)
 559 {
 560     if (id) {
 561         dev->id = id;
 562     }
 563
 564     if (dev->id) {
 565         object_property_add_child(qdev_get_peripheral(), dev->id,
 566                                   OBJECT(dev));
 567     } else {
 568         static int anon_count;
 569         gchar *name = g_strdup_printf("device[%d]", anon_count++);
 570         object_property_add_child(qdev_get_peripheral_anon(), name,
 571                                   OBJECT(dev));
 572         g_free(name);
 573     }
 574 }
 575
 576 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
 577 {
 578     DeviceClass *dc;
 579     const char *driver, *path;
 580     DeviceState *dev = NULL;
 581     BusState *bus = NULL;
 582
 583     driver = qemu_opt_get(opts, "driver");
 584     if (!driver) {
 585         error_setg(errp, QERR_MISSING_PARAMETER, "driver");
 586         return NULL;
 587     }
 588
 589     /* find driver */
 590     dc = qdev_get_device_class(&driver, errp);
 591     if (!dc) {
 592         return NULL;
 593     }
 594
 595     /* find bus */
 596     path = qemu_opt_get(opts, "bus");
 597     if (path != NULL) {
 598         bus = qbus_find(path, errp);
 599         if (!bus) {
 600             return NULL;
 601         }
 602         if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
 603             error_setg(errp, "Device '%s' can't go on %s bus",
 604                        driver, object_get_typename(OBJECT(bus)));
 605             return NULL;
 606         }
 607     } else if (dc->bus_type != NULL) {
 608         bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
 609         if (!bus || qbus_is_full(bus)) {
 610             error_setg(errp, "No '%s' bus found for device '%s'",
 611                        dc->bus_type, driver);
 612             return NULL;
 613         }
 614     }
 615
 616     if (qemu_opt_get(opts, "failover_pair_id")) {
 617         if (!opts->id) {
 618             error_setg(errp, "Device with failover_pair_id don't have id");
 619             return NULL;
 620         }
 621         if (qdev_should_hide_device(opts)) {
 622             if (bus && !qbus_is_hotpluggable(bus)) {
 623                 error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 624             }
 625             return NULL;
 626         }
 627     }
 628
 629     if (qdev_hotplug && bus && !qbus_is_hotpluggable(bus)) {
 630         error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
 631         return NULL;
 632     }
 633
 634     if (!migration_is_idle()) {
 635         error_setg(errp, "device_add not allowed while migrating");
 636         return NULL;
 637     }
 638
 639     /* create device */
 640     dev = qdev_new(driver);
 641
 642     /* Check whether the hotplug is allowed by the machine */
 643     if (qdev_hotplug && !qdev_hotplug_allowed(dev, errp)) {
 644         goto err_del_dev;
 645     }
 646
 647     if (!bus && qdev_hotplug && !qdev_get_machine_hotplug_handler(dev)) {
 648         /* No bus, no machine hotplug handler --> device is not hotpluggable */
 649         error_setg(errp, "Device '%s' can not be hotplugged on this machine",
 650                    driver);
 651         goto err_del_dev;
 652     }
 653
 654     qdev_set_id(dev, qemu_opts_id(opts));
 655
 656     /* set properties */
 657     if (qemu_opt_foreach(opts, set_property, dev, errp)) {
 658         goto err_del_dev;
 659     }
 660
 661     dev->opts = opts;
 662     if (!qdev_realize(DEVICE(dev), bus, errp)) {
 663         dev->opts = NULL;
 664         goto err_del_dev;
 665     }
 666     return dev;
 667
 668 err_del_dev:
 669     if (dev) {
 670         object_unparent(OBJECT(dev));
 671         object_unref(OBJECT(dev));
 672     }
 673     return NULL;
 674 }
 675
 676
 677 #define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
 678 static void qbus_print(Monitor *mon, BusState *bus, int indent);
 679
 680 static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
 681                              int indent)
 682 {
 683     if (!props)
 684         return;
 685     for (; props->name; props++) {
 686         char *value;
 687         char *legacy_name = g_strdup_printf("legacy-%s", props->name);
 688
 689         if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
 690             value = object_property_get_str(OBJECT(dev), legacy_name, NULL);
 691         } else {
 692             value = object_property_print(OBJECT(dev), props->name, true,
 693                                           NULL);
 694         }
 695         g_free(legacy_name);
 696
 697         if (!value) {
 698             continue;
 699         }
 700         qdev_printf("%s = %s\n", props->name,
 701                     *value ? value : "<null>");
 702         g_free(value);
 703     }
 704 }
 705
 706 static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
 707 {
 708     BusClass *bc = BUS_GET_CLASS(bus);
 709
 710     if (bc->print_dev) {
 711         bc->print_dev(mon, dev, indent);
 712     }
 713 }
 714
 715 static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
 716 {
 717     ObjectClass *class;
 718     BusState *child;
 719     NamedGPIOList *ngl;
 720     NamedClockList *ncl;
 721
 722     qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
 723                 dev->id ? dev->id : "");
 724     indent += 2;
 725     QLIST_FOREACH(ngl, &dev->gpios, node) {
 726         if (ngl->num_in) {
 727             qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
 728                         ngl->num_in);
 729         }
 730         if (ngl->num_out) {
 731             qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
 732                         ngl->num_out);
 733         }
 734     }
 735     QLIST_FOREACH(ncl, &dev->clocks, node) {
 736         qdev_printf("clock-%s%s \"%s\" freq_hz=%e\n",
 737                     ncl->output ? "out" : "in",
 738                     ncl->alias ? " (alias)" : "",
 739                     ncl->name,
 740                     CLOCK_PERIOD_TO_HZ(1.0 * clock_get(ncl->clock)));
 741     }
 742     class = object_get_class(OBJECT(dev));
 743     do {
 744         qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
 745         class = object_class_get_parent(class);
 746     } while (class != object_class_by_name(TYPE_DEVICE));
 747     bus_print_dev(dev->parent_bus, mon, dev, indent);
 748     QLIST_FOREACH(child, &dev->child_bus, sibling) {
 749         qbus_print(mon, child, indent);
 750     }
 751 }
 752
 753 static void qbus_print(Monitor *mon, BusState *bus, int indent)
 754 {
 755     BusChild *kid;
 756
 757     qdev_printf("bus: %s\n", bus->name);
 758     indent += 2;
 759     qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
 760     QTAILQ_FOREACH(kid, &bus->children, sibling) {
 761         DeviceState *dev = kid->child;
 762         qdev_print(mon, dev, indent);
 763     }
 764 }
 765 #undef qdev_printf
 766
 767 void hmp_info_qtree(Monitor *mon, const QDict *qdict)
 768 {
 769     if (sysbus_get_default())
 770         qbus_print(mon, sysbus_get_default(), 0);
 771 }
 772
 773 void hmp_info_qdm(Monitor *mon, const QDict *qdict)
 774 {
 775     qdev_print_devinfos(true);
 776 }
 777
 778 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
 779 {
 780     QemuOpts *opts;
 781     DeviceState *dev;
 782
 783     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
 784     if (!opts) {
 785         return;
 786     }
 787     if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
 788         qemu_opts_del(opts);
 789         return;
 790     }
 791     dev = qdev_device_add(opts, errp);
 792
 793     /*
 794      * Drain all pending RCU callbacks. This is done because
 795      * some bus related operations can delay a device removal
 796      * (in this case this can happen if device is added and then
 797      * removed due to a configuration error)
 798      * to a RCU callback, but user might expect that this interface
 799      * will finish its job completely once qmp command returns result
 800      * to the user
 801      */
 802     drain_call_rcu();
 803
 804     if (!dev) {
 805         qemu_opts_del(opts);
 806         return;
 807     }
 808     object_unref(OBJECT(dev));
 809 }
 810
 811 static DeviceState *find_device_state(const char *id, Error **errp)
 812 {
 813     Object *obj;
 814
 815     if (id[0] == '/') {
 816         obj = object_resolve_path(id, NULL);
 817     } else {
 818         char *root_path = object_get_canonical_path(qdev_get_peripheral());
 819         char *path = g_strdup_printf("%s/%s", root_path, id);
 820
 821         g_free(root_path);
 822         obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
 823         g_free(path);
 824     }
 825
 826     if (!obj) {
 827         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 828                   "Device '%s' not found", id);
 829         return NULL;
 830     }
 831
 832     if (!object_dynamic_cast(obj, TYPE_DEVICE)) {
 833         error_setg(errp, "%s is not a hotpluggable device", id);
 834         return NULL;
 835     }
 836
 837     return DEVICE(obj);
 838 }
 839
 840 void qdev_unplug(DeviceState *dev, Error **errp)
 841 {
 842     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 843     HotplugHandler *hotplug_ctrl;
 844     HotplugHandlerClass *hdc;
 845     Error *local_err = NULL;
 846
 847     if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
 848         error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
 849         return;
 850     }
 851
 852     if (!dc->hotpluggable) {
 853         error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
 854                    object_get_typename(OBJECT(dev)));
 855         return;
 856     }
 857
 858     if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
 859         error_setg(errp, "device_del not allowed while migrating");
 860         return;
 861     }
 862
 863     qdev_hot_removed = true;
 864
 865     hotplug_ctrl = qdev_get_hotplug_handler(dev);
 866     /* hotpluggable device MUST have HotplugHandler, if it doesn't
 867      * then something is very wrong with it */
 868     g_assert(hotplug_ctrl);
 869
 870     /* If device supports async unplug just request it to be done,
 871      * otherwise just remove it synchronously */
 872     hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
 873     if (hdc->unplug_request) {
 874         hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
 875     } else {
 876         hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
 877         if (!local_err) {
 878             object_unparent(OBJECT(dev));
 879         }
 880     }
 881     error_propagate(errp, local_err);
 882 }
 883
 884 void qmp_device_del(const char *id, Error **errp)
 885 {
 886     DeviceState *dev = find_device_state(id, errp);
 887     if (dev != NULL) {
 888         if (dev->pending_deleted_event) {
 889             error_setg(errp, "Device %s is already in the "
 890                              "process of unplug", id);
 891             return;
 892         }
 893
 894         qdev_unplug(dev, errp);
 895     }
 896 }
 897
 898 void hmp_device_add(Monitor *mon, const QDict *qdict)
 899 {
 900     Error *err = NULL;
 901
 902     qmp_device_add((QDict *)qdict, NULL, &err);
 903     hmp_handle_error(mon, err);
 904 }
 905
 906 void hmp_device_del(Monitor *mon, const QDict *qdict)
 907 {
 908     const char *id = qdict_get_str(qdict, "id");
 909     Error *err = NULL;
 910
 911     qmp_device_del(id, &err);
 912     hmp_handle_error(mon, err);
 913 }
 914
 915 BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
 916 {
 917     DeviceState *dev;
 918     BlockBackend *blk;
 919
 920     dev = find_device_state(id, errp);
 921     if (dev == NULL) {
 922         return NULL;
 923     }
 924
 925     blk = blk_by_dev(dev);
 926     if (!blk) {
 927         error_setg(errp, "Device does not have a block device backend");
 928     }
 929     return blk;
 930 }
 931
 932 QemuOptsList qemu_device_opts = {
 933     .name = "device",
 934     .implied_opt_name = "driver",
 935     .head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
 936     .desc = {
 937         /*
 938          * no elements => accept any
 939          * sanity checking will happen later
 940          * when setting device properties
 941          */
 942         { /* end of list */ }
 943     },
 944 };
 945
 946 QemuOptsList qemu_global_opts = {
 947     .name = "global",
 948     .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
 949     .desc = {
 950         {
 951             .name = "driver",
 952             .type = QEMU_OPT_STRING,
 953         },{
 954             .name = "property",
 955             .type = QEMU_OPT_STRING,
 956         },{
 957             .name = "value",
 958             .type = QEMU_OPT_STRING,
 959         },
 960         { /* end of list */ }
 961     },
 962 };
 963
 964 int qemu_global_option(const char *str)
 965 {
 966     char driver[64], property[64];
 967     QemuOpts *opts;
 968     int rc, offset;
 969
 970     rc = sscanf(str, "%63[^.=].%63[^=]%n", driver, property, &offset);
 971     if (rc == 2 && str[offset] == '=') {
 972         opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
 973         qemu_opt_set(opts, "driver", driver, &error_abort);
 974         qemu_opt_set(opts, "property", property, &error_abort);
 975         qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
 976         return 0;
 977     }
 978
 979     opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
 980     if (!opts) {
 981         return -1;
 982     }
 983
 984     return 0;
 985 }