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