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