hw/qdev.h

   1 #ifndef QDEV_H
   2 #define QDEV_H
   3
   4 #include "hw.h"
   5 #include "qemu-queue.h"
   6 #include "qemu-char.h"
   7 #include "qemu-option.h"
   8 #include "qapi/qapi-visit-core.h"
   9
  10 typedef struct Property Property;
  11
  12 typedef struct PropertyInfo PropertyInfo;
  13
  14 typedef struct CompatProperty CompatProperty;
  15
  16 typedef struct DeviceInfo DeviceInfo;
  17
  18 typedef struct BusState BusState;
  19
  20 typedef struct BusInfo BusInfo;
  21
  22 enum DevState {
  23     DEV_STATE_CREATED = 1,
  24     DEV_STATE_INITIALIZED,
  25 };
  26
  27 enum {
  28     DEV_NVECTORS_UNSPECIFIED = -1,
  29 };
  30
  31 /**
  32  * @DevicePropertyAccessor - called when trying to get/set a property
  33  *
  34  * @dev the device that owns the property
  35  * @v the visitor that contains the property data
  36  * @opaque the device property opaque
  37  * @name the name of the property
  38  * @errp a pointer to an Error that is filled if getting/setting fails.
  39  */
  40 typedef void (DevicePropertyAccessor)(DeviceState *dev,
  41                                       Visitor *v,
  42                                       void *opaque,
  43                                       const char *name,
  44                                       Error **errp);
  45
  46 /**
  47  * @DevicePropertyRelease - called when a property is removed from a device
  48  *
  49  * @dev the device that owns the property
  50  * @name the name of the property
  51  * @opaque the opaque registered with the property
  52  */
  53 typedef void (DevicePropertyRelease)(DeviceState *dev,
  54                                      const char *name,
  55                                      void *opaque);
  56
  57 typedef struct DeviceProperty
  58 {
  59     gchar *name;
  60     gchar *type;
  61     DevicePropertyAccessor *get;
  62     DevicePropertyAccessor *set;
  63     DevicePropertyRelease *release;
  64     void *opaque;
  65
  66     QTAILQ_ENTRY(DeviceProperty) node;
  67 } DeviceProperty;
  68
  69 /* This structure should not be accessed directly.  We declare it here
  70    so that it can be embedded in individual device state structures.  */
  71 struct DeviceState {
  72     const char *id;
  73     enum DevState state;
  74     QemuOpts *opts;
  75     int hotplugged;
  76     DeviceInfo *info;
  77     BusState *parent_bus;
  78     int num_gpio_out;
  79     qemu_irq *gpio_out;
  80     int num_gpio_in;
  81     qemu_irq *gpio_in;
  82     QLIST_HEAD(, BusState) child_bus;
  83     int num_child_bus;
  84     QTAILQ_ENTRY(DeviceState) sibling;
  85     int instance_id_alias;
  86     int alias_required_for_version;
  87
  88     /**
  89      * This tracks the number of references between devices.  See @qdev_ref for
  90      * more information.
  91      */
  92     uint32_t ref;
  93
  94     QTAILQ_HEAD(, DeviceProperty) properties;
  95
  96     /* Do not, under any circumstance, use this parent link below anywhere
  97      * outside of qdev.c.  You have been warned. */
  98     DeviceState *parent;
  99 };
 100
 101 typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);
 102 typedef char *(*bus_get_dev_path)(DeviceState *dev);
 103 /*
 104  * This callback is used to create Open Firmware device path in accordance with
 105  * OF spec http://forthworks.com/standards/of1275.pdf. Indicidual bus bindings
 106  * can be found here http://playground.sun.com/1275/bindings/.
 107  */
 108 typedef char *(*bus_get_fw_dev_path)(DeviceState *dev);
 109 typedef int (qbus_resetfn)(BusState *bus);
 110
 111 struct BusInfo {
 112     const char *name;
 113     size_t size;
 114     bus_dev_printfn print_dev;
 115     bus_get_dev_path get_dev_path;
 116     bus_get_fw_dev_path get_fw_dev_path;
 117     qbus_resetfn *reset;
 118     Property *props;
 119 };
 120
 121 struct BusState {
 122     DeviceState *parent;
 123     BusInfo *info;
 124     const char *name;
 125     int allow_hotplug;
 126     int qdev_allocated;
 127     QTAILQ_HEAD(ChildrenHead, DeviceState) children;
 128     QLIST_ENTRY(BusState) sibling;
 129 };
 130
 131 struct Property {
 132     const char   *name;
 133     PropertyInfo *info;
 134     int          offset;
 135     int          bitnr;
 136     void         *defval;
 137 };
 138
 139 enum PropertyType {
 140     PROP_TYPE_UNSPEC = 0,
 141     PROP_TYPE_UINT8,
 142     PROP_TYPE_UINT16,
 143     PROP_TYPE_UINT32,
 144     PROP_TYPE_INT32,
 145     PROP_TYPE_UINT64,
 146     PROP_TYPE_TADDR,
 147     PROP_TYPE_MACADDR,
 148     PROP_TYPE_DRIVE,
 149     PROP_TYPE_CHR,
 150     PROP_TYPE_STRING,
 151     PROP_TYPE_NETDEV,
 152     PROP_TYPE_VLAN,
 153     PROP_TYPE_PTR,
 154     PROP_TYPE_BIT,
 155 };
 156
 157 struct PropertyInfo {
 158     const char *name;
 159     const char *legacy_name;
 160     size_t size;
 161     enum PropertyType type;
 162     int64_t min;
 163     int64_t max;
 164     int (*parse)(DeviceState *dev, Property *prop, const char *str);
 165     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
 166     void (*free)(DeviceState *dev, Property *prop);
 167     DevicePropertyAccessor *get;
 168     DevicePropertyAccessor *set;
 169 };
 170
 171 typedef struct GlobalProperty {
 172     const char *driver;
 173     const char *property;
 174     const char *value;
 175     QTAILQ_ENTRY(GlobalProperty) next;
 176 } GlobalProperty;
 177
 178 /*** Board API.  This should go away once we have a machine config file.  ***/
 179
 180 DeviceState *qdev_create(BusState *bus, const char *name);
 181 DeviceState *qdev_try_create(BusState *bus, const char *name);
 182 bool qdev_exists(const char *name);
 183 int qdev_device_help(QemuOpts *opts);
 184 DeviceState *qdev_device_add(QemuOpts *opts);
 185 int qdev_init(DeviceState *dev) QEMU_WARN_UNUSED_RESULT;
 186 void qdev_init_nofail(DeviceState *dev);
 187 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
 188                                  int required_for_version);
 189 int qdev_unplug(DeviceState *dev);
 190 void qdev_free(DeviceState *dev);
 191 int qdev_simple_unplug_cb(DeviceState *dev);
 192 void qdev_machine_creation_done(void);
 193 bool qdev_machine_modified(void);
 194
 195 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 196 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 197
 198 BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
 199
 200 /*** Device API.  ***/
 201
 202 typedef int (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
 203 typedef int (*qdev_event)(DeviceState *dev);
 204 typedef void (*qdev_resetfn)(DeviceState *dev);
 205
 206 struct DeviceInfo {
 207     const char *name;
 208     const char *fw_name;
 209     const char *alias;
 210     const char *desc;
 211     size_t size;
 212     Property *props;
 213     int no_user;
 214
 215     /* callbacks */
 216     qdev_resetfn reset;
 217
 218     /* device state */
 219     const VMStateDescription *vmsd;
 220
 221     /* Private to qdev / bus.  */
 222     qdev_initfn init;
 223     qdev_event unplug;
 224     qdev_event exit;
 225     BusInfo *bus_info;
 226     struct DeviceInfo *next;
 227 };
 228 extern DeviceInfo *device_info_list;
 229
 230 void qdev_register(DeviceInfo *info);
 231
 232 /* Register device properties.  */
 233 /* GPIO inputs also double as IRQ sinks.  */
 234 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
 235 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
 236
 237 CharDriverState *qdev_init_chardev(DeviceState *dev);
 238
 239 BusState *qdev_get_parent_bus(DeviceState *dev);
 240
 241 /*** BUS API. ***/
 242
 243 DeviceState *qdev_find_recursive(BusState *bus, const char *id);
 244
 245 /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
 246 typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
 247 typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
 248
 249 void qbus_create_inplace(BusState *bus, BusInfo *info,
 250                          DeviceState *parent, const char *name);
 251 BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name);
 252 /* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
 253  *         < 0 if either devfn or busfn terminate walk somewhere in cursion,
 254  *           0 otherwise. */
 255 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
 256                        qbus_walkerfn *busfn, void *opaque);
 257 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
 258                        qbus_walkerfn *busfn, void *opaque);
 259 void qdev_reset_all(DeviceState *dev);
 260 void qbus_reset_all_fn(void *opaque);
 261
 262 void qbus_free(BusState *bus);
 263
 264 #define FROM_QBUS(type, dev) DO_UPCAST(type, qbus, dev)
 265
 266 /* This should go away once we get rid of the NULL bus hack */
 267 BusState *sysbus_get_default(void);
 268
 269 /*** monitor commands ***/
 270
 271 void do_info_qtree(Monitor *mon);
 272 void do_info_qdm(Monitor *mon);
 273 int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data);
 274 int do_device_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
 275
 276 /*** qdev-properties.c ***/
 277
 278 extern PropertyInfo qdev_prop_bit;
 279 extern PropertyInfo qdev_prop_uint8;
 280 extern PropertyInfo qdev_prop_uint16;
 281 extern PropertyInfo qdev_prop_uint32;
 282 extern PropertyInfo qdev_prop_int32;
 283 extern PropertyInfo qdev_prop_uint64;
 284 extern PropertyInfo qdev_prop_hex8;
 285 extern PropertyInfo qdev_prop_hex32;
 286 extern PropertyInfo qdev_prop_hex64;
 287 extern PropertyInfo qdev_prop_string;
 288 extern PropertyInfo qdev_prop_chr;
 289 extern PropertyInfo qdev_prop_ptr;
 290 extern PropertyInfo qdev_prop_macaddr;
 291 extern PropertyInfo qdev_prop_drive;
 292 extern PropertyInfo qdev_prop_netdev;
 293 extern PropertyInfo qdev_prop_vlan;
 294 extern PropertyInfo qdev_prop_pci_devfn;
 295
 296 #define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
 297         .name      = (_name),                                    \
 298         .info      = &(_prop),                                   \
 299         .offset    = offsetof(_state, _field)                    \
 300             + type_check(_type,typeof_field(_state, _field)),    \
 301         }
 302 #define DEFINE_PROP_DEFAULT(_name, _state, _field, _defval, _prop, _type) { \
 303         .name      = (_name),                                           \
 304         .info      = &(_prop),                                          \
 305         .offset    = offsetof(_state, _field)                           \
 306             + type_check(_type,typeof_field(_state, _field)),           \
 307         .defval    = (_type[]) { _defval },                             \
 308         }
 309 #define DEFINE_PROP_BIT(_name, _state, _field, _bit, _defval) {  \
 310         .name      = (_name),                                    \
 311         .info      = &(qdev_prop_bit),                           \
 312         .bitnr    = (_bit),                                      \
 313         .offset    = offsetof(_state, _field)                    \
 314             + type_check(uint32_t,typeof_field(_state, _field)), \
 315         .defval    = (bool[]) { (_defval) },                     \
 316         }
 317
 318 #define DEFINE_PROP_UINT8(_n, _s, _f, _d)                       \
 319     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
 320 #define DEFINE_PROP_UINT16(_n, _s, _f, _d)                      \
 321     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
 322 #define DEFINE_PROP_UINT32(_n, _s, _f, _d)                      \
 323     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
 324 #define DEFINE_PROP_INT32(_n, _s, _f, _d)                      \
 325     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_int32, int32_t)
 326 #define DEFINE_PROP_UINT64(_n, _s, _f, _d)                      \
 327     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
 328 #define DEFINE_PROP_HEX8(_n, _s, _f, _d)                       \
 329     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex8, uint8_t)
 330 #define DEFINE_PROP_HEX32(_n, _s, _f, _d)                       \
 331     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex32, uint32_t)
 332 #define DEFINE_PROP_HEX64(_n, _s, _f, _d)                       \
 333     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex64, uint64_t)
 334 #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d)                   \
 335     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_pci_devfn, uint32_t)
 336
 337 #define DEFINE_PROP_PTR(_n, _s, _f)             \
 338     DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, void*)
 339 #define DEFINE_PROP_CHR(_n, _s, _f)             \
 340     DEFINE_PROP(_n, _s, _f, qdev_prop_chr, CharDriverState*)
 341 #define DEFINE_PROP_STRING(_n, _s, _f)             \
 342     DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
 343 #define DEFINE_PROP_NETDEV(_n, _s, _f)             \
 344     DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, VLANClientState*)
 345 #define DEFINE_PROP_VLAN(_n, _s, _f)             \
 346     DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, VLANState*)
 347 #define DEFINE_PROP_DRIVE(_n, _s, _f) \
 348     DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockDriverState *)
 349 #define DEFINE_PROP_MACADDR(_n, _s, _f)         \
 350     DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, MACAddr)
 351
 352 #define DEFINE_PROP_END_OF_LIST()               \
 353     {}
 354
 355 /* Set properties between creation and init.  */
 356 void *qdev_get_prop_ptr(DeviceState *dev, Property *prop);
 357 int qdev_prop_exists(DeviceState *dev, const char *name);
 358 int qdev_prop_parse(DeviceState *dev, const char *name, const char *value);
 359 void qdev_prop_set(DeviceState *dev, const char *name, void *src, enum PropertyType type);
 360 void qdev_prop_set_bit(DeviceState *dev, const char *name, bool value);
 361 void qdev_prop_set_uint8(DeviceState *dev, const char *name, uint8_t value);
 362 void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
 363 void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
 364 void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
 365 void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
 366 void qdev_prop_set_string(DeviceState *dev, const char *name, char *value);
 367 void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value);
 368 void qdev_prop_set_netdev(DeviceState *dev, const char *name, VLANClientState *value);
 369 void qdev_prop_set_vlan(DeviceState *dev, const char *name, VLANState *value);
 370 int qdev_prop_set_drive(DeviceState *dev, const char *name, BlockDriverState *value) QEMU_WARN_UNUSED_RESULT;
 371 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name, BlockDriverState *value);
 372 void qdev_prop_set_macaddr(DeviceState *dev, const char *name, uint8_t *value);
 373 /* FIXME: Remove opaque pointer properties.  */
 374 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
 375 void qdev_prop_set_defaults(DeviceState *dev, Property *props);
 376
 377 void qdev_prop_register_global_list(GlobalProperty *props);
 378 void qdev_prop_set_globals(DeviceState *dev);
 379 void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
 380                                     Property *prop, const char *value);
 381
 382 static inline const char *qdev_fw_name(DeviceState *dev)
 383 {
 384     return dev->info->fw_name ? : dev->info->alias ? : dev->info->name;
 385 }
 386
 387 char *qdev_get_fw_dev_path(DeviceState *dev);
 388 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 389 extern struct BusInfo system_bus_info;
 390
 391 /**
 392  * @qdev_ref
 393  *
 394  * Increase the reference count of a device.  A device cannot be freed as long
 395  * as its reference count is greater than zero.
 396  *
 397  * @dev - the device
 398  */
 399 void qdev_ref(DeviceState *dev);
 400
 401 /**
 402  * @qdef_unref
 403  *
 404  * Decrease the reference count of a device.  A device cannot be freed as long
 405  * as its reference count is greater than zero.
 406  *
 407  * @dev - the device
 408  */
 409 void qdev_unref(DeviceState *dev);
 410
 411 /**
 412  * @qdev_property_add - add a new property to a device
 413  *
 414  * @dev - the device to add a property to
 415  *
 416  * @name - the name of the property.  This can contain any character except for
 417  *         a forward slash.  In general, you should use hyphens '-' instead of
 418  *         underscores '_' when naming properties.
 419  *
 420  * @type - the type name of the property.  This namespace is pretty loosely
 421  *         defined.  Sub namespaces are constructed by using a prefix and then
 422  *         to angle brackets.  For instance, the type 'virtio-net-pci' in the
 423  *         'link' namespace would be 'link<virtio-net-pci>'.
 424  *
 425  * @get - the getter to be called to read a property.  If this is NULL, then
 426  *        the property cannot be read.
 427  *
 428  * @set - the setter to be called to write a property.  If this is NULL,
 429  *        then the property cannot be written.
 430  *
 431  * @release - called when the property is removed from the device.  This is
 432  *            meant to allow a property to free its opaque upon device
 433  *            destruction.  This may be NULL.
 434  *
 435  * @opaque - an opaque pointer to pass to the callbacks for the property
 436  *
 437  * @errp - returns an error if this function fails
 438  */
 439 void qdev_property_add(DeviceState *dev, const char *name, const char *type,
 440                        DevicePropertyAccessor *get, DevicePropertyAccessor *set,
 441                        DevicePropertyRelease *release,
 442                        void *opaque, Error **errp);
 443
 444 /**
 445  * @qdev_property_get - reads a property from a device
 446  *
 447  * @dev - the device
 448  *
 449  * @v - the visitor that will receive the property value.  This should be an
 450  *      Output visitor and the data will be written with @name as the name.
 451  *
 452  * @name - the name of the property
 453  *
 454  * @errp - returns an error if this function fails
 455  */
 456 void qdev_property_get(DeviceState *dev, Visitor *v, const char *name,
 457                        Error **errp);
 458
 459 /**
 460  * @qdev_property_set - writes a property to a device
 461  *
 462  * @dev - the device
 463  *
 464  * @v - the visitor that will be used to write the property value.  This should
 465  *      be an Input visitor and the data will be first read with @name as the
 466  *      name and then written as the property value.
 467  *
 468  * @name - the name of the property
 469  *
 470  * @errp - returns an error if this function fails
 471  */
 472 void qdev_property_set(DeviceState *dev, Visitor *v, const char *name,
 473                        Error **errp);
 474
 475 /**
 476  * @qdev_property_get_type - returns the type of a property
 477  *
 478  * @dev - the device
 479  *
 480  * @name - the name of the property
 481  *
 482  * @errp - returns an error if this function fails
 483  *
 484  * Returns:
 485  *   The type name of the property.
 486  */
 487 const char *qdev_property_get_type(DeviceState *dev, const char *name,
 488                                    Error **errp);
 489
 490 /**
 491  * @qdev_property_add_static - add a @Property to a device referencing a
 492  * field in a struct.
 493  */
 494 void qdev_property_add_static(DeviceState *dev, Property *prop, Error **errp);
 495
 496 /**
 497  * @qdev_get_root - returns the root device of the composition tree
 498  *
 499  * Returns:
 500  *   The root of the composition tree.
 501  */
 502 DeviceState *qdev_get_root(void);
 503
 504 /**
 505  * @qdev_get_canonical_path - returns the canonical path for a device.  This
 506  * is the path within the composition tree starting from the root.
 507  *
 508  * Returns:
 509  *   The canonical path in the composition tree.
 510  */
 511 gchar *qdev_get_canonical_path(DeviceState *dev);
 512
 513 /**
 514  * @qdev_resolve_path - resolves a path returning a device
 515  *
 516  * There are two types of supported paths--absolute paths and partial paths.
 517  *
 518  * Absolute paths are derived from the root device and can follow child<> or
 519  * link<> properties.  Since they can follow link<> properties, they can be
 520  * arbitrarily long.  Absolute paths look like absolute filenames and are
 521  * prefixed with a leading slash.
 522  *
 523  * Partial paths look like relative filenames.  They do not begin with a
 524  * prefix.  The matching rules for partial paths are subtle but designed to make
 525  * specifying devices easy.  At each level of the composition tree, the partial
 526  * path is matched as an absolute path.  The first match is not returned.  At
 527  * least two matches are searched for.  A successful result is only returned if
 528  * only one match is founded.  If more than one match is found, a flag is
 529  * return to indicate that the match was ambiguous.
 530  *
 531  * @path - the path to resolve
 532  *
 533  * @ambiguous - returns true if the path resolution failed because of an
 534  *              ambiguous match
 535  *
 536  * Returns:
 537  *   The matched device or NULL on path lookup failure.
 538  */
 539 DeviceState *qdev_resolve_path(const char *path, bool *ambiguous);
 540
 541 /**
 542  * @qdev_property_add_child - Add a child property to a device
 543  *
 544  * Child properties form the composition tree.  All devices need to be a child
 545  * of another device.  Devices can only be a child of one device.
 546  *
 547  * There is no way for a child to determine what its parent is.  It is not
 548  * a bidirectional relationship.  This is by design.
 549  *
 550  * @dev - the device to add a property to
 551  *
 552  * @name - the name of the property
 553  *
 554  * @child - the child device
 555  *
 556  * @errp - if an error occurs, a pointer to an area to store the area
 557  */
 558 void qdev_property_add_child(DeviceState *dev, const char *name,
 559                              DeviceState *child, Error **errp);
 560
 561 /**
 562  * @qdev_property_add_link - Add a link property to a device
 563  *
 564  * Links establish relationships between devices.  Links are unidirectional
 565  * although two links can be combined to form a bidirectional relationship
 566  * between devices.
 567  *
 568  * Links form the graph in the device model.
 569  *
 570  * @dev - the device to add a property to
 571  *
 572  * @name - the name of the property
 573  *
 574  * @type - the qdev type of the link
 575  *
 576  * @child - a pointer to where the link device reference is stored
 577  *
 578  * @errp - if an error occurs, a pointer to an area to store the area
 579  */
 580 void qdev_property_add_link(DeviceState *dev, const char *name,
 581                             const char *type, DeviceState **child,
 582                             Error **errp);
 583
 584 /**
 585  * @qdev_property_add_str
 586  *
 587  * Add a string property using getters/setters.  This function will add a
 588  * property of type 'string'.
 589  *
 590  * @dev - the device to add a property to
 591  *
 592  * @name - the name of the property
 593  *
 594  * @get - the getter or NULL if the property is write-only.  This function must
 595  *        return a string to be freed by @g_free().
 596  *
 597  * @set - the setter or NULL if the property is read-only
 598  *
 599  * @errp - if an error occurs, a pointer to an area to store the error
 600  */
 601 void qdev_property_add_str(DeviceState *dev, const char *name,
 602                            char *(*get)(DeviceState *, Error **),
 603                            void (*set)(DeviceState *, const char *, Error **),
 604                            Error **errp);
 605
 606 /**
 607  * @qdev_get_type
 608  *
 609  * Returns the string representation of the type of this object.
 610  *
 611  * @dev - the device
 612  *
 613  * @errp - if an error occurs, a pointer to an area to store the error
 614  *
 615  * Returns: a string representing the type.  This must be freed by the caller
 616  *          with g_free().
 617  */
 618 char *qdev_get_type(DeviceState *dev, Error **errp);
 619
 620 /**
 621  * @qdev_machine_init
 622  *
 623  * Initialize platform devices before machine init.  This is a hack until full
 624  * support for composition is added.
 625  */
 626 void qdev_machine_init(void);
 627
 628 #endif