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 "qom/object.h"
   8 #include "hw/irq.h"
   9 #include "qapi/error.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 int (*qdev_initfn)(DeviceState *dev);
  21 typedef int (*qdev_event)(DeviceState *dev);
  22 typedef void (*qdev_resetfn)(DeviceState *dev);
  23 typedef void (*DeviceRealize)(DeviceState *dev, Error **errp);
  24 typedef void (*DeviceUnrealize)(DeviceState *dev, Error **errp);
  25
  26 struct VMStateDescription;
  27
  28 /**
  29  * DeviceClass:
  30  * @props: Properties accessing state fields.
  31  * @realize: Callback function invoked when the #DeviceState:realized
  32  * property is changed to %true. The default invokes @init if not %NULL.
  33  * @unrealize: Callback function invoked when the #DeviceState:realized
  34  * property is changed to %false.
  35  * @init: Callback function invoked when the #DeviceState::realized property
  36  * is changed to %true. Deprecated, new types inheriting directly from
  37  * TYPE_DEVICE should use @realize instead, new leaf types should consult
  38  * their respective parent type.
  39  *
  40  * # Realization #
  41  * Devices are constructed in two stages,
  42  * 1) object instantiation via object_initialize() and
  43  * 2) device realization via #DeviceState:realized property.
  44  * The former may not fail (it might assert or exit), the latter may return
  45  * error information to the caller and must be re-entrant.
  46  * Trivial field initializations should go into #TypeInfo.instance_init.
  47  * Operations depending on @props static properties should go into @realize.
  48  * After successful realization, setting static properties will fail.
  49  *
  50  * As an interim step, the #DeviceState:realized property is set by deprecated
  51  * functions qdev_init() and qdev_init_nofail().
  52  * In the future, devices will propagate this state change to their children
  53  * and along busses they expose.
  54  * The point in time will be deferred to machine creation, so that values
  55  * set in @realize will not be introspectable beforehand. Therefore devices
  56  * must not create children during @realize; they should initialize them via
  57  * object_initialize() in their own #TypeInfo.instance_init and forward the
  58  * realization events appropriately.
  59  *
  60  * The @init callback is considered private to a particular bus implementation
  61  * (immediate abstract child types of TYPE_DEVICE). Derived leaf types set an
  62  * "init" callback on their parent class instead.
  63  *
  64  * Any type may override the @realize and/or @unrealize callbacks but needs
  65  * to call the parent type's implementation if keeping their functionality
  66  * is desired. Refer to QOM documentation for further discussion and examples.
  67  *
  68  * <note>
  69  *   <para>
  70  * If a type derived directly from TYPE_DEVICE implements @realize, it does
  71  * not need to implement @init and therefore does not need to store and call
  72  * #DeviceClass' default @realize callback.
  73  * For other types consult the documentation and implementation of the
  74  * respective parent types.
  75  *   </para>
  76  * </note>
  77  */
  78 typedef struct DeviceClass {
  79     /*< private >*/
  80     ObjectClass parent_class;
  81     /*< public >*/
  82
  83     const char *fw_name;
  84     const char *desc;
  85     Property *props;
  86     int no_user;
  87
  88     /* callbacks */
  89     void (*reset)(DeviceState *dev);
  90     DeviceRealize realize;
  91     DeviceUnrealize unrealize;
  92
  93     /* device state */
  94     const struct VMStateDescription *vmsd;
  95
  96     /* Private to qdev / bus.  */
  97     qdev_initfn init; /* TODO remove, once users are converted to realize */
  98     qdev_event unplug;
  99     qdev_event exit;
 100     const char *bus_type;
 101 } DeviceClass;
 102
 103 /**
 104  * DeviceState:
 105  * @realized: Indicates whether the device has been fully constructed.
 106  *
 107  * This structure should not be accessed directly.  We declare it here
 108  * so that it can be embedded in individual device state structures.
 109  */
 110 struct DeviceState {
 111     /*< private >*/
 112     Object parent_obj;
 113     /*< public >*/
 114
 115     const char *id;
 116     bool realized;
 117     QemuOpts *opts;
 118     int hotplugged;
 119     BusState *parent_bus;
 120     int num_gpio_out;
 121     qemu_irq *gpio_out;
 122     int num_gpio_in;
 123     qemu_irq *gpio_in;
 124     QLIST_HEAD(, BusState) child_bus;
 125     int num_child_bus;
 126     int instance_id_alias;
 127     int alias_required_for_version;
 128 };
 129
 130 #define TYPE_BUS "bus"
 131 #define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS)
 132 #define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS)
 133 #define BUS_GET_CLASS(obj) OBJECT_GET_CLASS(BusClass, (obj), TYPE_BUS)
 134
 135 struct BusClass {
 136     ObjectClass parent_class;
 137
 138     /* FIXME first arg should be BusState */
 139     void (*print_dev)(Monitor *mon, DeviceState *dev, int indent);
 140     char *(*get_dev_path)(DeviceState *dev);
 141     /*
 142      * This callback is used to create Open Firmware device path in accordance
 143      * with OF spec http://forthworks.com/standards/of1275.pdf. Individual bus
 144      * bindings can be found at http://playground.sun.com/1275/bindings/.
 145      */
 146     char *(*get_fw_dev_path)(DeviceState *dev);
 147     int (*reset)(BusState *bus);
 148     /* maximum devices allowed on the bus, 0: no limit. */
 149     int max_dev;
 150 };
 151
 152 typedef struct BusChild {
 153     DeviceState *child;
 154     int index;
 155     QTAILQ_ENTRY(BusChild) sibling;
 156 } BusChild;
 157
 158 /**
 159  * BusState:
 160  */
 161 struct BusState {
 162     Object obj;
 163     DeviceState *parent;
 164     const char *name;
 165     int allow_hotplug;
 166     int max_index;
 167     QTAILQ_HEAD(ChildrenHead, BusChild) children;
 168     QLIST_ENTRY(BusState) sibling;
 169 };
 170
 171 struct Property {
 172     const char   *name;
 173     PropertyInfo *info;
 174     int          offset;
 175     uint8_t      bitnr;
 176     uint8_t      qtype;
 177     int64_t      defval;
 178 };
 179
 180 struct PropertyInfo {
 181     const char *name;
 182     const char *legacy_name;
 183     const char **enum_table;
 184     int (*parse)(DeviceState *dev, Property *prop, const char *str);
 185     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
 186     ObjectPropertyAccessor *get;
 187     ObjectPropertyAccessor *set;
 188     ObjectPropertyRelease *release;
 189 };
 190
 191 typedef struct GlobalProperty {
 192     const char *driver;
 193     const char *property;
 194     const char *value;
 195     QTAILQ_ENTRY(GlobalProperty) next;
 196 } GlobalProperty;
 197
 198 /*** Board API.  This should go away once we have a machine config file.  ***/
 199
 200 DeviceState *qdev_create(BusState *bus, const char *name);
 201 DeviceState *qdev_try_create(BusState *bus, const char *name);
 202 int qdev_init(DeviceState *dev) QEMU_WARN_UNUSED_RESULT;
 203 void qdev_init_nofail(DeviceState *dev);
 204 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
 205                                  int required_for_version);
 206 void qdev_unplug(DeviceState *dev, Error **errp);
 207 void qdev_free(DeviceState *dev);
 208 int qdev_simple_unplug_cb(DeviceState *dev);
 209 void qdev_machine_creation_done(void);
 210 bool qdev_machine_modified(void);
 211
 212 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 213 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 214
 215 BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
 216
 217 /*** Device API.  ***/
 218
 219 /* Register device properties.  */
 220 /* GPIO inputs also double as IRQ sinks.  */
 221 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
 222 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
 223
 224 BusState *qdev_get_parent_bus(DeviceState *dev);
 225
 226 /*** BUS API. ***/
 227
 228 DeviceState *qdev_find_recursive(BusState *bus, const char *id);
 229
 230 /* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
 231 typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
 232 typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
 233
 234 void qbus_create_inplace(BusState *bus, const char *typename,
 235                          DeviceState *parent, const char *name);
 236 BusState *qbus_create(const char *typename, DeviceState *parent, const char *name);
 237 /* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
 238  *         < 0 if either devfn or busfn terminate walk somewhere in cursion,
 239  *           0 otherwise. */
 240 int qbus_walk_children(BusState *bus, qdev_walkerfn *devfn,
 241                        qbus_walkerfn *busfn, void *opaque);
 242 int qdev_walk_children(DeviceState *dev, qdev_walkerfn *devfn,
 243                        qbus_walkerfn *busfn, void *opaque);
 244 void qdev_reset_all(DeviceState *dev);
 245
 246 /**
 247  * @qbus_reset_all:
 248  * @bus: Bus to be reset.
 249  *
 250  * Reset @bus and perform a bus-level ("hard") reset of all devices connected
 251  * to it, including recursive processing of all buses below @bus itself.  A
 252  * hard reset means that qbus_reset_all will reset all state of the device.
 253  * For PCI devices, for example, this will include the base address registers
 254  * or configuration space.
 255  */
 256 void qbus_reset_all(BusState *bus);
 257 void qbus_reset_all_fn(void *opaque);
 258
 259 void qbus_free(BusState *bus);
 260
 261 #define FROM_QBUS(type, dev) DO_UPCAST(type, qbus, dev)
 262
 263 /* This should go away once we get rid of the NULL bus hack */
 264 BusState *sysbus_get_default(void);
 265
 266 char *qdev_get_fw_dev_path(DeviceState *dev);
 267
 268 /**
 269  * @qdev_machine_init
 270  *
 271  * Initialize platform devices before machine init.  This is a hack until full
 272  * support for composition is added.
 273  */
 274 void qdev_machine_init(void);
 275
 276 /**
 277  * @device_reset
 278  *
 279  * Reset a single device (by calling the reset method).
 280  */
 281 void device_reset(DeviceState *dev);
 282
 283 const struct VMStateDescription *qdev_get_vmsd(DeviceState *dev);
 284
 285 const char *qdev_fw_name(DeviceState *dev);
 286
 287 Object *qdev_get_machine(void);
 288
 289 /* FIXME: make this a link<> */
 290 void qdev_set_parent_bus(DeviceState *dev, BusState *bus);
 291
 292 extern int qdev_hotplug;
 293
 294 char *qdev_get_dev_path(DeviceState *dev);
 295
 296 #endif