include/hw/qdev-core.h

   1 #ifndef QDEV_CORE_H
   2 #define QDEV_CORE_H
   3
   4 #include "qemu/queue.h"
   5 #include "qemu/bitmap.h"
   6 #include "qom/object.h"
   7 #include "hw/hotplug.h"
   8 #include "hw/resettable.h"
   9
  10 enum {
  11     DEV_NVECTORS_UNSPECIFIED = -1,
  12 };
  13
  14 #define TYPE_DEVICE "device"
  15 #define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)
  16 #define DEVICE_CLASS(klass) OBJECT_CLASS_CHECK(DeviceClass, (klass), TYPE_DEVICE)
  17 #define DEVICE_GET_CLASS(obj) OBJECT_GET_CLASS(DeviceClass, (obj), TYPE_DEVICE)
  18
  19 typedef enum DeviceCategory {
  20     DEVICE_CATEGORY_BRIDGE,
  21     DEVICE_CATEGORY_USB,
  22     DEVICE_CATEGORY_STORAGE,
  23     DEVICE_CATEGORY_NETWORK,
  24     DEVICE_CATEGORY_INPUT,
  25     DEVICE_CATEGORY_DISPLAY,
  26     DEVICE_CATEGORY_SOUND,
  27     DEVICE_CATEGORY_MISC,
  28     DEVICE_CATEGORY_CPU,
  29     DEVICE_CATEGORY_MAX
  30 } DeviceCategory;
  31
  32 typedef void (*DeviceRealize)(DeviceState *dev, Error **errp);
  33 typedef void (*DeviceUnrealize)(DeviceState *dev, Error **errp);
  34 typedef void (*DeviceReset)(DeviceState *dev);
  35 typedef void (*BusRealize)(BusState *bus, Error **errp);
  36 typedef void (*BusUnrealize)(BusState *bus, Error **errp);
  37
  38 /**
  39  * DeviceClass:
  40  * @props: Properties accessing state fields.
  41  * @realize: Callback function invoked when the #DeviceState:realized
  42  * property is changed to %true.
  43  * @unrealize: Callback function invoked when the #DeviceState:realized
  44  * property is changed to %false.
  45  * @hotpluggable: indicates if #DeviceClass is hotpluggable, available
  46  * as readonly "hotpluggable" property of #DeviceState instance
  47  *
  48  * # Realization #
  49  * Devices are constructed in two stages,
  50  * 1) object instantiation via object_initialize() and
  51  * 2) device realization via #DeviceState:realized property.
  52  * The former may not fail (and must not abort or exit, since it is called
  53  * during device introspection already), and the latter may return error
  54  * information to the caller and must be re-entrant.
  55  * Trivial field initializations should go into #TypeInfo.instance_init.
  56  * Operations depending on @props static properties should go into @realize.
  57  * After successful realization, setting static properties will fail.
  58  *
  59  * As an interim step, the #DeviceState:realized property can also be
  60  * set with qdev_init_nofail().
  61  * In the future, devices will propagate this state change to their children
  62  * and along busses they expose.
  63  * The point in time will be deferred to machine creation, so that values
  64  * set in @realize will not be introspectable beforehand. Therefore devices
  65  * must not create children during @realize; they should initialize them via
  66  * object_initialize() in their own #TypeInfo.instance_init and forward the
  67  * realization events appropriately.
  68  *
  69  * Any type may override the @realize and/or @unrealize callbacks but needs
  70  * to call the parent type's implementation if keeping their functionality
  71  * is desired. Refer to QOM documentation for further discussion and examples.
  72  *
  73  * <note>
  74  *   <para>
  75  * Since TYPE_DEVICE doesn't implement @realize and @unrealize, types
  76  * derived directly from it need not call their parent's @realize and
  77  * @unrealize.
  78  * For other types consult the documentation and implementation of the
  79  * respective parent types.
  80  *   </para>
  81  * </note>
  82  *
  83  * # Hiding a device #
  84  * To hide a device, a DeviceListener function should_be_hidden() needs to
  85  * be registered.
  86  * It can be used to defer adding a device and therefore hide it from the
  87  * guest. The handler registering to this DeviceListener can save the QOpts
  88  * passed to it for re-using it later and must return that it wants the device
  89  * to be/remain hidden or not. When the handler function decides the device
  90  * shall not be hidden it will be added in qdev_device_add() and
  91  * realized as any other device. Otherwise qdev_device_add() will return early
  92  * without adding the device. The guest will not see a "hidden" device
  93  * until it was marked don't hide and qdev_device_add called again.
  94  *
  95  */
  96 typedef struct DeviceClass {
  97     /*< private >*/
  98     ObjectClass parent_class;
  99     /*< public >*/
 100
 101     DECLARE_BITMAP(categories, DEVICE_CATEGORY_MAX);
 102     const char *fw_name;
 103     const char *desc;
 104
 105     /*
 106      * The underscore at the end ensures a compile-time error if someone
 107      * assigns to dc->props instead of using device_class_set_props.
 108      */
 109     Property *props_;
 110
 111     /*
 112      * Can this device be instantiated with -device / device_add?
 113      * All devices should support instantiation with device_add, and
 114      * this flag should not exist.  But we're not there, yet.  Some
 115      * devices fail to instantiate with cryptic error messages.
 116      * Others instantiate, but don't work.  Exposing users to such
 117      * behavior would be cruel; clearing this flag will protect them.
 118      * It should never be cleared without a comment explaining why it
 119      * is cleared.
 120      * TODO remove once we're there
 121      */
 122     bool user_creatable;
 123     bool hotpluggable;
 124
 125     /* callbacks */
 126     /*
 127      * Reset method here is deprecated and replaced by methods in the
 128      * resettable class interface to implement a multi-phase reset.
 129      * TODO: remove once every reset callback is unused
 130      */
 131     DeviceReset reset;
 132     DeviceRealize realize;
 133     DeviceUnrealize unrealize;
 134
 135     /* device state */
 136     const VMStateDescription *vmsd;
 137
 138     /* Private to qdev / bus.  */
 139     const char *bus_type;
 140 } DeviceClass;
 141
 142 typedef struct NamedGPIOList NamedGPIOList;
 143
 144 struct NamedGPIOList {
 145     char *name;
 146     qemu_irq *in;
 147     int num_in;
 148     int num_out;
 149     QLIST_ENTRY(NamedGPIOList) node;
 150 };
 151
 152 /**
 153  * DeviceState:
 154  * @realized: Indicates whether the device has been fully constructed.
 155  * @reset: ResettableState for the device; handled by Resettable interface.
 156  *
 157  * This structure should not be accessed directly.  We declare it here
 158  * so that it can be embedded in individual device state structures.
 159  */
 160 struct DeviceState {
 161     /*< private >*/
 162     Object parent_obj;
 163     /*< public >*/
 164
 165     const char *id;
 166     char *canonical_path;
 167     bool realized;
 168     bool pending_deleted_event;
 169     QemuOpts *opts;
 170     int hotplugged;
 171     bool allow_unplug_during_migration;
 172     BusState *parent_bus;
 173     QLIST_HEAD(, NamedGPIOList) gpios;
 174     QLIST_HEAD(, BusState) child_bus;
 175     int num_child_bus;
 176     int instance_id_alias;
 177     int alias_required_for_version;
 178     ResettableState reset;
 179 };
 180
 181 struct DeviceListener {
 182     void (*realize)(DeviceListener *listener, DeviceState *dev);
 183     void (*unrealize)(DeviceListener *listener, DeviceState *dev);
 184     /*
 185      * This callback is called upon init of the DeviceState and allows to
 186      * inform qdev that a device should be hidden, depending on the device
 187      * opts, for example, to hide a standby device.
 188      */
 189     int (*should_be_hidden)(DeviceListener *listener, QemuOpts *device_opts);
 190     QTAILQ_ENTRY(DeviceListener) link;
 191 };
 192
 193 #define TYPE_BUS "bus"
 194 #define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS)
 195 #define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS)
 196 #define BUS_GET_CLASS(obj) OBJECT_GET_CLASS(BusClass, (obj), TYPE_BUS)
 197
 198 struct BusClass {
 199     ObjectClass parent_class;
 200
 201     /* FIXME first arg should be BusState */
 202     void (*print_dev)(Monitor *mon, DeviceState *dev, int indent);
 203     char *(*get_dev_path)(DeviceState *dev);
 204     /*
 205      * This callback is used to create Open Firmware device path in accordance
 206      * with OF spec http://forthworks.com/standards/of1275.pdf. Individual bus
 207      * bindings can be found at http://playground.sun.com/1275/bindings/.
 208      */
 209     char *(*get_fw_dev_path)(DeviceState *dev);
 210     void (*reset)(BusState *bus);
 211     BusRealize realize;
 212     BusUnrealize unrealize;
 213
 214     /* maximum devices allowed on the bus, 0: no limit. */
 215     int max_dev;
 216     /* number of automatically allocated bus ids (e.g. ide.0) */
 217     int automatic_ids;
 218 };
 219
 220 typedef struct BusChild {
 221     DeviceState *child;
 222     int index;
 223     QTAILQ_ENTRY(BusChild) sibling;
 224 } BusChild;
 225
 226 #define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
 227
 228 /**
 229  * BusState:
 230  * @hotplug_handler: link to a hotplug handler associated with bus.
 231  * @reset: ResettableState for the bus; handled by Resettable interface.
 232  */
 233 struct BusState {
 234     Object obj;
 235     DeviceState *parent;
 236     char *name;
 237     HotplugHandler *hotplug_handler;
 238     int max_index;
 239     bool realized;
 240     int num_children;
 241     QTAILQ_HEAD(, BusChild) children;
 242     QLIST_ENTRY(BusState) sibling;
 243     ResettableState reset;
 244 };
 245
 246 /**
 247  * Property:
 248  * @set_default: true if the default value should be set from @defval,
 249  *    in which case @info->set_default_value must not be NULL
 250  *    (if false then no default value is set by the property system
 251  *     and the field retains whatever value it was given by instance_init).
 252  * @defval: default value for the property. This is used only if @set_default
 253  *     is true.
 254  */
 255 struct Property {
 256     const char   *name;
 257     const PropertyInfo *info;
 258     ptrdiff_t    offset;
 259     uint8_t      bitnr;
 260     bool         set_default;
 261     union {
 262         int64_t i;
 263         uint64_t u;
 264     } defval;
 265     int          arrayoffset;
 266     const PropertyInfo *arrayinfo;
 267     int          arrayfieldsize;
 268     const char   *link_type;
 269 };
 270
 271 struct PropertyInfo {
 272     const char *name;
 273     const char *description;
 274     const QEnumLookup *enum_table;
 275     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
 276     void (*set_default_value)(ObjectProperty *op, const Property *prop);
 277     void (*create)(ObjectClass *oc, Property *prop, Error **errp);
 278     ObjectPropertyAccessor *get;
 279     ObjectPropertyAccessor *set;
 280     ObjectPropertyRelease *release;
 281 };
 282
 283 /**
 284  * GlobalProperty:
 285  * @used: Set to true if property was used when initializing a device.
 286  * @optional: If set to true, GlobalProperty will be skipped without errors
 287  *            if the property doesn't exist.
 288  *
 289  * An error is fatal for non-hotplugged devices, when the global is applied.
 290  */
 291 typedef struct GlobalProperty {
 292     const char *driver;
 293     const char *property;
 294     const char *value;
 295     bool used;
 296     bool optional;
 297 } GlobalProperty;
 298
 299 static inline void
 300 compat_props_add(GPtrArray *arr,
 301                  GlobalProperty props[], size_t nelem)
 302 {
 303     int i;
 304     for (i = 0; i < nelem; i++) {
 305         g_ptr_array_add(arr, (void *)&props[i]);
 306     }
 307 }
 308
 309 /*** Board API.  This should go away once we have a machine config file.  ***/
 310
 311 DeviceState *qdev_create(BusState *bus, const char *name);
 312 DeviceState *qdev_try_create(BusState *bus, const char *name);
 313 void qdev_init_nofail(DeviceState *dev);
 314 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
 315                                  int required_for_version);
 316 HotplugHandler *qdev_get_bus_hotplug_handler(DeviceState *dev);
 317 HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);
 318 bool qdev_hotplug_allowed(DeviceState *dev, Error **errp);
 319 /**
 320  * qdev_get_hotplug_handler: Get handler responsible for device wiring
 321  *
 322  * Find HOTPLUG_HANDLER for @dev that provides [pre|un]plug callbacks for it.
 323  *
 324  * Note: in case @dev has a parent bus, it will be returned as handler unless
 325  * machine handler overrides it.
 326  *
 327  * Returns: pointer to object that implements TYPE_HOTPLUG_HANDLER interface
 328  *          or NULL if there aren't any.
 329  */
 330 HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev);
 331 void qdev_unplug(DeviceState *dev, Error **errp);
 332 void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
 333                                   DeviceState *dev, Error **errp);
 334 void qdev_machine_creation_done(void);
 335 bool qdev_machine_modified(void);
 336
 337 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 338 qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
 339
 340 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 341 void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
 342                                  qemu_irq pin);
 343 qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
 344 qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
 345                                  const char *name, int n);
 346
 347 BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
 348
 349 /*** Device API.  ***/
 350
 351 /* Register device properties.  */
 352 /* GPIO inputs also double as IRQ sinks.  */
 353 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
 354 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
 355 void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
 356                               const char *name, int n);
 357 /**
 358  * qdev_init_gpio_in_named_with_opaque: create an array of input GPIO lines
 359  *   for the specified device
 360  *
 361  * @dev: Device to create input GPIOs for
 362  * @handler: Function to call when GPIO line value is set
 363  * @opaque: Opaque data pointer to pass to @handler
 364  * @name: Name of the GPIO input (must be unique for this device)
 365  * @n: Number of GPIO lines in this input set
 366  */
 367 void qdev_init_gpio_in_named_with_opaque(DeviceState *dev,
 368                                          qemu_irq_handler handler,
 369                                          void *opaque,
 370                                          const char *name, int n);
 371
 372 /**
 373  * qdev_init_gpio_in_named: create an array of input GPIO lines
 374  *   for the specified device
 375  *
 376  * Like qdev_init_gpio_in_named_with_opaque(), but the opaque pointer
 377  * passed to the handler is @dev (which is the most commonly desired behaviour).
 378  */
 379 static inline void qdev_init_gpio_in_named(DeviceState *dev,
 380                                            qemu_irq_handler handler,
 381                                            const char *name, int n)
 382 {
 383     qdev_init_gpio_in_named_with_opaque(dev, handler, dev, name, n);
 384 }
 385
 386 void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
 387                      const char *name);
 388
 389 BusState *qdev_get_parent_bus(DeviceState *dev);
 390
 391 /*** BUS API. ***/
 392
 393 DeviceState *qdev_find_recursive(BusState *bus, const char *id);
 394
 395 /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
 396 typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
 397 typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
 398
 399 void qbus_create_inplace(void *bus, size_t size, const char *typename,
 400                          DeviceState *parent, const char *name);
 401 BusState *qbus_create(const char *typename, DeviceState *parent, const char *name);
 402 /* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
 403  *         < 0 if either devfn or busfn terminate walk somewhere in cursion,
 404  *           0 otherwise. */
 405 int qbus_walk_children(BusState *bus,
 406                        qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
 407                        qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
 408                        void *opaque);
 409 int qdev_walk_children(DeviceState *dev,
 410                        qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
 411                        qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
 412                        void *opaque);
 413
 414 /**
 415  * @qdev_reset_all:
 416  * Reset @dev. See @qbus_reset_all() for more details.
 417  *
 418  * Note: This function is deprecated and will be removed when it becomes unused.
 419  * Please use device_cold_reset() now.
 420  */
 421 void qdev_reset_all(DeviceState *dev);
 422 void qdev_reset_all_fn(void *opaque);
 423
 424 /**
 425  * @qbus_reset_all:
 426  * @bus: Bus to be reset.
 427  *
 428  * Reset @bus and perform a bus-level ("hard") reset of all devices connected
 429  * to it, including recursive processing of all buses below @bus itself.  A
 430  * hard reset means that qbus_reset_all will reset all state of the device.
 431  * For PCI devices, for example, this will include the base address registers
 432  * or configuration space.
 433  *
 434  * Note: This function is deprecated and will be removed when it becomes unused.
 435  * Please use bus_cold_reset() now.
 436  */
 437 void qbus_reset_all(BusState *bus);
 438 void qbus_reset_all_fn(void *opaque);
 439
 440 /**
 441  * device_cold_reset:
 442  * Reset device @dev and perform a recursive processing using the resettable
 443  * interface. It triggers a RESET_TYPE_COLD.
 444  */
 445 void device_cold_reset(DeviceState *dev);
 446
 447 /**
 448  * bus_cold_reset:
 449  *
 450  * Reset bus @bus and perform a recursive processing using the resettable
 451  * interface. It triggers a RESET_TYPE_COLD.
 452  */
 453 void bus_cold_reset(BusState *bus);
 454
 455 /**
 456  * device_is_in_reset:
 457  * Return true if the device @dev is currently being reset.
 458  */
 459 bool device_is_in_reset(DeviceState *dev);
 460
 461 /**
 462  * bus_is_in_reset:
 463  * Return true if the bus @bus is currently being reset.
 464  */
 465 bool bus_is_in_reset(BusState *bus);
 466
 467 /* This should go away once we get rid of the NULL bus hack */
 468 BusState *sysbus_get_default(void);
 469
 470 char *qdev_get_fw_dev_path(DeviceState *dev);
 471 char *qdev_get_own_fw_dev_path_from_handler(BusState *bus, DeviceState *dev);
 472
 473 /**
 474  * @qdev_machine_init
 475  *
 476  * Initialize platform devices before machine init.  This is a hack until full
 477  * support for composition is added.
 478  */
 479 void qdev_machine_init(void);
 480
 481 /**
 482  * device_legacy_reset:
 483  *
 484  * Reset a single device (by calling the reset method).
 485  * Note: This function is deprecated and will be removed when it becomes unused.
 486  * Please use device_cold_reset() now.
 487  */
 488 void device_legacy_reset(DeviceState *dev);
 489
 490 void device_class_set_props(DeviceClass *dc, Property *props);
 491
 492 /**
 493  * device_class_set_parent_reset:
 494  * TODO: remove the function when DeviceClass's reset method
 495  * is not used anymore.
 496  */
 497 void device_class_set_parent_reset(DeviceClass *dc,
 498                                    DeviceReset dev_reset,
 499                                    DeviceReset *parent_reset);
 500 void device_class_set_parent_realize(DeviceClass *dc,
 501                                      DeviceRealize dev_realize,
 502                                      DeviceRealize *parent_realize);
 503 void device_class_set_parent_unrealize(DeviceClass *dc,
 504                                        DeviceUnrealize dev_unrealize,
 505                                        DeviceUnrealize *parent_unrealize);
 506
 507 const VMStateDescription *qdev_get_vmsd(DeviceState *dev);
 508
 509 const char *qdev_fw_name(DeviceState *dev);
 510
 511 Object *qdev_get_machine(void);
 512
 513 /* FIXME: make this a link<> */
 514 void qdev_set_parent_bus(DeviceState *dev, BusState *bus);
 515
 516 extern bool qdev_hotplug;
 517 extern bool qdev_hot_removed;
 518
 519 char *qdev_get_dev_path(DeviceState *dev);
 520
 521 void qbus_set_hotplug_handler(BusState *bus, Object *handler, Error **errp);
 522
 523 void qbus_set_bus_hotplug_handler(BusState *bus, Error **errp);
 524
 525 static inline bool qbus_is_hotpluggable(BusState *bus)
 526 {
 527    return bus->hotplug_handler;
 528 }
 529
 530 void device_listener_register(DeviceListener *listener);
 531 void device_listener_unregister(DeviceListener *listener);
 532
 533 /**
 534  * @qdev_should_hide_device:
 535  * @opts: QemuOpts as passed on cmdline.
 536  *
 537  * Check if a device should be added.
 538  * When a device is added via qdev_device_add() this will be called,
 539  * and return if the device should be added now or not.
 540  */
 541 bool qdev_should_hide_device(QemuOpts *opts);
 542
 543 #endif