include/hw/qdev-core.h

   1 #ifndef QDEV_CORE_H
   2 #define QDEV_CORE_H
   3
   4 #include "qemu/queue.h"
   5 #include "qemu/option.h"
   6 #include "qemu/bitmap.h"
   7 #include "qom/object.h"
   8 #include "hw/irq.h"
   9 #include "hw/hotplug.h"
  10
  11 enum {
  12     DEV_NVECTORS_UNSPECIFIED = -1,
  13 };
  14
  15 #define TYPE_DEVICE "device"
  16 #define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)
  17 #define DEVICE_CLASS(klass) OBJECT_CLASS_CHECK(DeviceClass, (klass), TYPE_DEVICE)
  18 #define DEVICE_GET_CLASS(obj) OBJECT_GET_CLASS(DeviceClass, (obj), TYPE_DEVICE)
  19
  20 typedef enum DeviceCategory {
  21     DEVICE_CATEGORY_BRIDGE,
  22     DEVICE_CATEGORY_USB,
  23     DEVICE_CATEGORY_STORAGE,
  24     DEVICE_CATEGORY_NETWORK,
  25     DEVICE_CATEGORY_INPUT,
  26     DEVICE_CATEGORY_DISPLAY,
  27     DEVICE_CATEGORY_SOUND,
  28     DEVICE_CATEGORY_MISC,
  29     DEVICE_CATEGORY_MAX
  30 } DeviceCategory;
  31
  32 typedef int (*qdev_initfn)(DeviceState *dev);
  33 typedef int (*qdev_event)(DeviceState *dev);
  34 typedef void (*qdev_resetfn)(DeviceState *dev);
  35 typedef void (*DeviceRealize)(DeviceState *dev, Error **errp);
  36 typedef void (*DeviceUnrealize)(DeviceState *dev, Error **errp);
  37 typedef void (*BusRealize)(BusState *bus, Error **errp);
  38 typedef void (*BusUnrealize)(BusState *bus, Error **errp);
  39
  40 struct VMStateDescription;
  41
  42 /**
  43  * DeviceClass:
  44  * @props: Properties accessing state fields.
  45  * @realize: Callback function invoked when the #DeviceState:realized
  46  * property is changed to %true. The default invokes @init if not %NULL.
  47  * @unrealize: Callback function invoked when the #DeviceState:realized
  48  * property is changed to %false.
  49  * @init: Callback function invoked when the #DeviceState::realized property
  50  * is changed to %true. Deprecated, new types inheriting directly from
  51  * TYPE_DEVICE should use @realize instead, new leaf types should consult
  52  * their respective parent type.
  53  * @hotpluggable: indicates if #DeviceClass is hotpluggable, available
  54  * as readonly "hotpluggable" property of #DeviceState instance
  55  *
  56  * # Realization #
  57  * Devices are constructed in two stages,
  58  * 1) object instantiation via object_initialize() and
  59  * 2) device realization via #DeviceState:realized property.
  60  * The former may not fail (it might assert or exit), the latter may return
  61  * error information to the caller and must be re-entrant.
  62  * Trivial field initializations should go into #TypeInfo.instance_init.
  63  * Operations depending on @props static properties should go into @realize.
  64  * After successful realization, setting static properties will fail.
  65  *
  66  * As an interim step, the #DeviceState:realized property can also be
  67  * set with qdev_init_nofail().
  68  * In the future, devices will propagate this state change to their children
  69  * and along busses they expose.
  70  * The point in time will be deferred to machine creation, so that values
  71  * set in @realize will not be introspectable beforehand. Therefore devices
  72  * must not create children during @realize; they should initialize them via
  73  * object_initialize() in their own #TypeInfo.instance_init and forward the
  74  * realization events appropriately.
  75  *
  76  * The @init callback is considered private to a particular bus implementation
  77  * (immediate abstract child types of TYPE_DEVICE). Derived leaf types set an
  78  * "init" callback on their parent class instead.
  79  *
  80  * Any type may override the @realize and/or @unrealize callbacks but needs
  81  * to call the parent type's implementation if keeping their functionality
  82  * is desired. Refer to QOM documentation for further discussion and examples.
  83  *
  84  * <note>
  85  *   <para>
  86  * If a type derived directly from TYPE_DEVICE implements @realize, it does
  87  * not need to implement @init and therefore does not need to store and call
  88  * #DeviceClass' default @realize callback.
  89  * For other types consult the documentation and implementation of the
  90  * respective parent types.
  91  *   </para>
  92  * </note>
  93  */
  94 typedef struct DeviceClass {
  95     /*< private >*/
  96     ObjectClass parent_class;
  97     /*< public >*/
  98
  99     DECLARE_BITMAP(categories, DEVICE_CATEGORY_MAX);
 100     const char *fw_name;
 101     const char *desc;
 102     Property *props;
 103
 104     /*
 105      * Shall we hide this device model from -device / device_add?
 106      * All devices should support instantiation with device_add, and
 107      * this flag should not exist.  But we're not there, yet.  Some
 108      * devices fail to instantiate with cryptic error messages.
 109      * Others instantiate, but don't work.  Exposing users to such
 110      * behavior would be cruel; this flag serves to protect them.  It
 111      * should never be set without a comment explaining why it is set.
 112      * TODO remove once we're there
 113      */
 114     bool cannot_instantiate_with_device_add_yet;
 115     /*
 116      * Does this device model survive object_unref(object_new(TNAME))?
 117      * All device models should, and this flag shouldn't exist.  Some
 118      * devices crash in object_new(), some crash or hang in
 119      * object_unref().  Makes introspecting properties with
 120      * qmp_device_list_properties() dangerous.  Bad, because it's used
 121      * by -device FOO,help.  This flag serves to protect that code.
 122      * It should never be set without a comment explaining why it is
 123      * set.
 124      * TODO remove once we're there
 125      */
 126     bool cannot_destroy_with_object_finalize_yet;
 127
 128     bool hotpluggable;
 129
 130     /* callbacks */
 131     void (*reset)(DeviceState *dev);
 132     DeviceRealize realize;
 133     DeviceUnrealize unrealize;
 134
 135     /* device state */
 136     const struct VMStateDescription *vmsd;
 137
 138     /* Private to qdev / bus.  */
 139     qdev_initfn init; /* TODO remove, once users are converted to realize */
 140     qdev_event exit; /* TODO remove, once users are converted to unrealize */
 141     const char *bus_type;
 142 } DeviceClass;
 143
 144 typedef struct NamedGPIOList NamedGPIOList;
 145
 146 struct NamedGPIOList {
 147     char *name;
 148     qemu_irq *in;
 149     int num_in;
 150     int num_out;
 151     QLIST_ENTRY(NamedGPIOList) node;
 152 };
 153
 154 /**
 155  * DeviceState:
 156  * @realized: Indicates whether the device has been fully constructed.
 157  *
 158  * This structure should not be accessed directly.  We declare it here
 159  * so that it can be embedded in individual device state structures.
 160  */
 161 struct DeviceState {
 162     /*< private >*/
 163     Object parent_obj;
 164     /*< public >*/
 165
 166     const char *id;
 167     bool realized;
 168     bool pending_deleted_event;
 169     QemuOpts *opts;
 170     int hotplugged;
 171     BusState *parent_bus;
 172     QLIST_HEAD(, NamedGPIOList) gpios;
 173     QLIST_HEAD(, BusState) child_bus;
 174     int num_child_bus;
 175     int instance_id_alias;
 176     int alias_required_for_version;
 177 };
 178
 179 struct DeviceListener {
 180     void (*realize)(DeviceListener *listener, DeviceState *dev);
 181     void (*unrealize)(DeviceListener *listener, DeviceState *dev);
 182     QTAILQ_ENTRY(DeviceListener) link;
 183 };
 184
 185 #define TYPE_BUS "bus"
 186 #define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS)
 187 #define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS)
 188 #define BUS_GET_CLASS(obj) OBJECT_GET_CLASS(BusClass, (obj), TYPE_BUS)
 189
 190 struct BusClass {
 191     ObjectClass parent_class;
 192
 193     /* FIXME first arg should be BusState */
 194     void (*print_dev)(Monitor *mon, DeviceState *dev, int indent);
 195     char *(*get_dev_path)(DeviceState *dev);
 196     /*
 197      * This callback is used to create Open Firmware device path in accordance
 198      * with OF spec http://forthworks.com/standards/of1275.pdf. Individual bus
 199      * bindings can be found at http://playground.sun.com/1275/bindings/.
 200      */
 201     char *(*get_fw_dev_path)(DeviceState *dev);
 202     void (*reset)(BusState *bus);
 203     BusRealize realize;
 204     BusUnrealize unrealize;
 205
 206     /* maximum devices allowed on the bus, 0: no limit. */
 207     int max_dev;
 208     /* number of automatically allocated bus ids (e.g. ide.0) */
 209     int automatic_ids;
 210 };
 211
 212 typedef struct BusChild {
 213     DeviceState *child;
 214     int index;
 215     QTAILQ_ENTRY(BusChild) sibling;
 216 } BusChild;
 217
 218 #define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
 219
 220 /**
 221  * BusState:
 222  * @hotplug_device: link to a hotplug device associated with bus.
 223  */
 224 struct BusState {
 225     Object obj;
 226     DeviceState *parent;
 227     char *name;
 228     HotplugHandler *hotplug_handler;
 229     int max_index;
 230     bool realized;
 231     QTAILQ_HEAD(ChildrenHead, BusChild) children;
 232     QLIST_ENTRY(BusState) sibling;
 233 };
 234
 235 struct Property {
 236     const char   *name;
 237     PropertyInfo *info;
 238     ptrdiff_t    offset;
 239     uint8_t      bitnr;
 240     QType        qtype;
 241     int64_t      defval;
 242     int          arrayoffset;
 243     PropertyInfo *arrayinfo;
 244     int          arrayfieldsize;
 245 };
 246
 247 struct PropertyInfo {
 248     const char *name;
 249     const char *description;
 250     const char * const *enum_table;
 251     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
 252     ObjectPropertyAccessor *get;
 253     ObjectPropertyAccessor *set;
 254     ObjectPropertyRelease *release;
 255 };
 256
 257 /**
 258  * GlobalProperty:
 259  * @user_provided: Set to true if property comes from user-provided config
 260  * (command-line or config file).
 261  * @used: Set to true if property was used when initializing a device.
 262  * @errp: Error destination, used like first argument of error_setg()
 263  *        in case property setting fails later. If @errp is NULL, we
 264  *        print warnings instead of ignoring errors silently. For
 265  *        hotplugged devices, errp is always ignored and warnings are
 266  *        printed instead.
 267  */
 268 typedef struct GlobalProperty {
 269     const char *driver;
 270     const char *property;
 271     const char *value;
 272     bool user_provided;
 273     bool used;
 274     Error **errp;
 275 } GlobalProperty;
 276
 277 /*** Board API.  This should go away once we have a machine config file.  ***/
 278
 279 DeviceState *qdev_create(BusState *bus, const char *name);
 280 DeviceState *qdev_try_create(BusState *bus, const char *name);
 281 void qdev_init_nofail(DeviceState *dev);
 282 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
 283                                  int required_for_version);
 284 HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev);
 285 void qdev_unplug(DeviceState *dev, Error **errp);
 286 void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
 287                                   DeviceState *dev, Error **errp);
 288 void qdev_machine_creation_done(void);
 289 bool qdev_machine_modified(void);
 290
 291 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 292 qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
 293
 294 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 295 void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
 296                                  qemu_irq pin);
 297 qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
 298 qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
 299                                  const char *name, int n);
 300
 301 BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
 302
 303 /*** Device API.  ***/
 304
 305 /* Register device properties.  */
 306 /* GPIO inputs also double as IRQ sinks.  */
 307 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
 308 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
 309 void qdev_init_gpio_in_named(DeviceState *dev, qemu_irq_handler handler,
 310                              const char *name, int n);
 311 void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
 312                               const char *name, int n);
 313
 314 void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
 315                      const char *name);
 316
 317 BusState *qdev_get_parent_bus(DeviceState *dev);
 318
 319 /*** BUS API. ***/
 320
 321 DeviceState *qdev_find_recursive(BusState *bus, const char *id);
 322
 323 /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
 324 typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
 325 typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
 326
 327 void qbus_create_inplace(void *bus, size_t size, const char *typename,
 328                          DeviceState *parent, const char *name);
 329 BusState *qbus_create(const char *typename, DeviceState *parent, const char *name);
 330 /* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
 331  *         < 0 if either devfn or busfn terminate walk somewhere in cursion,
 332  *           0 otherwise. */
 333 int qbus_walk_children(BusState *bus,
 334                        qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
 335                        qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
 336                        void *opaque);
 337 int qdev_walk_children(DeviceState *dev,
 338                        qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
 339                        qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
 340                        void *opaque);
 341
 342 void qdev_reset_all(DeviceState *dev);
 343 void qdev_reset_all_fn(void *opaque);
 344
 345 /**
 346  * @qbus_reset_all:
 347  * @bus: Bus to be reset.
 348  *
 349  * Reset @bus and perform a bus-level ("hard") reset of all devices connected
 350  * to it, including recursive processing of all buses below @bus itself.  A
 351  * hard reset means that qbus_reset_all will reset all state of the device.
 352  * For PCI devices, for example, this will include the base address registers
 353  * or configuration space.
 354  */
 355 void qbus_reset_all(BusState *bus);
 356 void qbus_reset_all_fn(void *opaque);
 357
 358 /* This should go away once we get rid of the NULL bus hack */
 359 BusState *sysbus_get_default(void);
 360
 361 char *qdev_get_fw_dev_path(DeviceState *dev);
 362 char *qdev_get_own_fw_dev_path_from_handler(BusState *bus, DeviceState *dev);
 363
 364 /**
 365  * @qdev_machine_init
 366  *
 367  * Initialize platform devices before machine init.  This is a hack until full
 368  * support for composition is added.
 369  */
 370 void qdev_machine_init(void);
 371
 372 /**
 373  * @device_reset
 374  *
 375  * Reset a single device (by calling the reset method).
 376  */
 377 void device_reset(DeviceState *dev);
 378
 379 const struct VMStateDescription *qdev_get_vmsd(DeviceState *dev);
 380
 381 const char *qdev_fw_name(DeviceState *dev);
 382
 383 Object *qdev_get_machine(void);
 384
 385 /* FIXME: make this a link<> */
 386 void qdev_set_parent_bus(DeviceState *dev, BusState *bus);
 387
 388 extern int qdev_hotplug;
 389
 390 char *qdev_get_dev_path(DeviceState *dev);
 391
 392 GSList *qdev_build_hotpluggable_device_list(Object *peripheral);
 393
 394 void qbus_set_hotplug_handler(BusState *bus, DeviceState *handler,
 395                               Error **errp);
 396
 397 void qbus_set_bus_hotplug_handler(BusState *bus, Error **errp);
 398
 399 static inline bool qbus_is_hotpluggable(BusState *bus)
 400 {
 401    return bus->hotplug_handler;
 402 }
 403
 404 void device_listener_register(DeviceListener *listener);
 405 void device_listener_unregister(DeviceListener *listener);
 406
 407 #endif