@@ -10,6 +10,65 @@
#include "hw/hotplug.h"
#include "hw/resettable.h"
+/**
+ * DOC: The QEMU Device API
+ *
+ * All modern devices should represented as a derived QOM class of
+ * TYPE_DEVICE. The device API introduces the additional methods of
+ * @realize and @unrealize to represent additional stages in a device
+ * objects life cycle.
+ *
+ * Realization
+ * -----------
+ *
+ * Devices are constructed in two stages:
+ *
+ * 1) object instantiation via object_initialize() and
+ * 2) device realization via the #DeviceState.realized property
+ *
+ * The former may not fail (and must not abort or exit, since it is called
+ * during device introspection already), and the latter may return error
+ * information to the caller and must be re-entrant.
+ * Trivial field initializations should go into #TypeInfo.instance_init.
+ * Operations depending on @props static properties should go into @realize.
+ * After successful realization, setting static properties will fail.
+ *
+ * As an interim step, the #DeviceState.realized property can also be
+ * set with qdev_realize(). In the future, devices will propagate this
+ * state change to their children and along busses they expose. The
+ * point in time will be deferred to machine creation, so that values
+ * set in @realize will not be introspectable beforehand. Therefore
+ * devices must not create children during @realize; they should
+ * initialize them via object_initialize() in their own
+ * #TypeInfo.instance_init and forward the realization events
+ * appropriately.
+ *
+ * Any type may override the @realize and/or @unrealize callbacks but needs
+ * to call the parent type's implementation if keeping their functionality
+ * is desired. Refer to QOM documentation for further discussion and examples.
+ *
+ * .. note::
+ * Since TYPE_DEVICE doesn't implement @realize and @unrealize, types
+ * derived directly from it need not call their parent's @realize and
+ * @unrealize. For other types consult the documentation and
+ * implementation of the respective parent types.
+ *
+ * Hiding a device
+ * ---------------
+ *
+ * To hide a device, a DeviceListener function hide_device() needs to
+ * be registered. It can be used to defer adding a device and
+ * therefore hide it from the guest. The handler registering to this
+ * DeviceListener can save the QOpts passed to it for re-using it
+ * later. It must return if it wants the device to be hidden or
+ * visible. When the handler function decides the device shall be
+ * visible it will be added with qdev_device_add() and realized as any
+ * other device. Otherwise qdev_device_add() will return early without
+ * adding the device. The guest will not see a "hidden" device until
+ * it was marked visible and qdev_device_add called again.
+ *
+ */
+
enum {
DEV_NVECTORS_UNSPECIFIED = -1,
};
@@ -38,7 +97,7 @@ typedef void (*BusRealize)(BusState *bus, Error **errp);
typedef void (*BusUnrealize)(BusState *bus);
/**
- * DeviceClass:
+ * struct DeviceClass - The base class for all devices.
* @props: Properties accessing state fields.
* @realize: Callback function invoked when the #DeviceState:realized
* property is changed to %true.
@@ -47,72 +106,37 @@ typedef void (*BusUnrealize)(BusState *bus);
* @hotpluggable: indicates if #DeviceClass is hotpluggable, available
* as readonly "hotpluggable" property of #DeviceState instance
*
- * # Realization #
- * Devices are constructed in two stages,
- * 1) object instantiation via object_initialize() and
- * 2) device realization via #DeviceState:realized property.
- * The former may not fail (and must not abort or exit, since it is called
- * during device introspection already), and the latter may return error
- * information to the caller and must be re-entrant.
- * Trivial field initializations should go into #TypeInfo.instance_init.
- * Operations depending on @props static properties should go into @realize.
- * After successful realization, setting static properties will fail.
- *
- * As an interim step, the #DeviceState:realized property can also be
- * set with qdev_realize().
- * In the future, devices will propagate this state change to their children
- * and along busses they expose.
- * The point in time will be deferred to machine creation, so that values
- * set in @realize will not be introspectable beforehand. Therefore devices
- * must not create children during @realize; they should initialize them via
- * object_initialize() in their own #TypeInfo.instance_init and forward the
- * realization events appropriately.
- *
- * Any type may override the @realize and/or @unrealize callbacks but needs
- * to call the parent type's implementation if keeping their functionality
- * is desired. Refer to QOM documentation for further discussion and examples.
- *
- * <note>
- * <para>
- * Since TYPE_DEVICE doesn't implement @realize and @unrealize, types
- * derived directly from it need not call their parent's @realize and
- * @unrealize.
- * For other types consult the documentation and implementation of the
- * respective parent types.
- * </para>
- * </note>
- *
- * # Hiding a device #
- * To hide a device, a DeviceListener function hide_device() needs to
- * be registered.
- * It can be used to defer adding a device and therefore hide it from
- * the guest. The handler registering to this DeviceListener can save
- * the QOpts passed to it for re-using it later. It must return if it
- * wants the device to be hidden or visible. When the handler function
- * decides the device shall be visible it will be added with
- * qdev_device_add() and realized as any other device. Otherwise
- * qdev_device_add() will return early without adding the device. The
- * guest will not see a "hidden" device until it was marked visible
- * and qdev_device_add called again.
- *
*/
struct DeviceClass {
- /*< private >*/
+ /* private: */
ObjectClass parent_class;
- /*< public >*/
+ /* public: */
+
+ /**
+ * @categories: device categories device belongs to
+ */
DECLARE_BITMAP(categories, DEVICE_CATEGORY_MAX);
+ /**
+ * @fw_name: name used to identify device to firmware interfaces
+ */
const char *fw_name;
+ /**
+ * @desc: human readable description of device
+ */
const char *desc;
- /*
- * The underscore at the end ensures a compile-time error if someone
- * assigns to dc->props instead of using device_class_set_props.
+ /**
+ * @props_: properties associated with device, should only be
+ * assigned by using device_class_set_props(). The underscore
+ * ensures a compile-time error if someone attempts to assign
+ * dc->props directly.
*/
Property *props_;
- /*
- * Can this device be instantiated with -device / device_add?
+ /**
+ * @user_creatable: Can user instantiate with -device / device_add?
+ *
* All devices should support instantiation with device_add, and
* this flag should not exist. But we're not there, yet. Some
* devices fail to instantiate with cryptic error messages.
@@ -120,25 +144,35 @@ struct DeviceClass {
* behavior would be cruel; clearing this flag will protect them.
* It should never be cleared without a comment explaining why it
* is cleared.
+ *
* TODO remove once we're there
*/
bool user_creatable;
bool hotpluggable;
/* callbacks */
- /*
- * Reset method here is deprecated and replaced by methods in the
- * resettable class interface to implement a multi-phase reset.
+ /**
+ * @reset: deprecated device reset method pointer
+ *
+ * Modern code should use the ResettableClass interface to
+ * implement a multi-phase reset.
+ *
* TODO: remove once every reset callback is unused
*/
DeviceReset reset;
DeviceRealize realize;
DeviceUnrealize unrealize;
- /* device state */
+ /**
+ * @vmsd: device state serialisation description for
+ * migration/save/restore
+ */
const VMStateDescription *vmsd;
- /* Private to qdev / bus. */
+ /**
+ * @bus_type: bus type
+ * private: to qdev / bus.
+ */
const char *bus_type;
};
@@ -167,37 +201,96 @@ typedef struct {
bool engaged_in_io;
} MemReentrancyGuard;
+
+typedef QLIST_HEAD(, NamedGPIOList) NamedGPIOListHead;
+typedef QLIST_HEAD(, NamedClockList) NamedClockListHead;
+typedef QLIST_HEAD(, BusState) BusStateHead;
+
/**
- * DeviceState:
- * @reset: ResettableState for the device; handled by Resettable interface.
+ * struct DeviceState - common device state, accessed with qdev helpers
*
* This structure should not be accessed directly. We declare it here
* so that it can be embedded in individual device state structures.
*/
struct DeviceState {
- /*< private >*/
+ /* private: */
Object parent_obj;
- /*< public >*/
+ /* public: */
+ /**
+ * @id: global device id
+ */
char *id;
+ /**
+ * @canonical_path: canonical path of realized device in the QOM tree
+ */
char *canonical_path;
+ /**
+ * @realized: has device been realized?
+ */
bool realized;
+ /**
+ * @pending_deleted_event: track pending deletion events during unplug
+ */
bool pending_deleted_event;
+ /**
+ * @pending_deleted_expires_ms: optional timeout for deletion events
+ */
int64_t pending_deleted_expires_ms;
+ /**
+ * @opts: QDict of options for the device
+ */
QDict *opts;
+ /**
+ * @hotplugged: was device added after PHASE_MACHINE_READY?
+ */
int hotplugged;
+ /**
+ * @allow_unplug_during_migration: can device be unplugged during migration
+ */
bool allow_unplug_during_migration;
+ /**
+ * @parent_bus: bus this device belongs to
+ */
BusState *parent_bus;
- QLIST_HEAD(, NamedGPIOList) gpios;
- QLIST_HEAD(, NamedClockList) clocks;
- QLIST_HEAD(, BusState) child_bus;
+ /**
+ * @gpios: QLIST of named GPIOs the device provides.
+ */
+ NamedGPIOListHead gpios;
+ /**
+ * @clocks: QLIST of named clocks the device provides.
+ */
+ NamedClockListHead clocks;
+ /**
+ * @child_bus: QLIST of child buses
+ */
+ BusStateHead child_bus;
+ /**
+ * @num_child_bus: number of @child_bus entries
+ */
int num_child_bus;
+ /**
+ * @instance_id_alias: device alias for handling legacy migration setups
+ */
int instance_id_alias;
+ /**
+ * @alias_required_for_version: indicates @instance_id_alias is
+ * needed for migration
+ */
int alias_required_for_version;
+ /**
+ * @reset: ResettableState for the device; handled by Resettable interface.
+ */
ResettableState reset;
+ /**
+ * @unplug_blockers: list of reasons to block unplugging of device
+ */
GSList *unplug_blockers;
-
- /* Is the device currently in mmio/pio/dma? Used to prevent re-entrancy */
+ /**
+ * @mem_reentrancy_guard: Is the device currently in mmio/pio/dma?
+ *
+ * Used to prevent re-entrancy confusing things.
+ */
MemReentrancyGuard mem_reentrancy_guard;
};
@@ -264,13 +357,24 @@ typedef struct BusChild {
#define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
+typedef QTAILQ_HEAD(, BusChild) BusChildHead;
+typedef QLIST_ENTRY(BusState) BusStateEntry;
+
/**
- * BusState:
+ * struct BusState:
+ * @obj: parent object
+ * @parent: parent Device
+ * @name: name of bus
* @hotplug_handler: link to a hotplug handler associated with bus.
- * @reset: ResettableState for the bus; handled by Resettable interface.
+ * @max_index: max number of child buses
+ * @realized: is the bus itself realized?
+ * @full: is the bus full?
+ * @num_children: current number of child buses
*/
struct BusState {
+ /* private: */
Object obj;
+ /* public: */
DeviceState *parent;
char *name;
HotplugHandler *hotplug_handler;
@@ -279,18 +383,24 @@ struct BusState {
bool full;
int num_children;
- /*
- * children is a RCU QTAILQ, thus readers must use RCU to access it,
- * and writers must hold the big qemu lock
+ /**
+ * @children: an RCU protected QTAILQ, thus readers must use RCU
+ * to access it, and writers must hold the big qemu lock
+ */
+ BusChildHead children;
+ /**
+ * @sibling: next bus
+ */
+ BusStateEntry sibling;
+ /**
+ * @reset: ResettableState for the bus; handled by Resettable interface.
*/
-
- QTAILQ_HEAD(, BusChild) children;
- QLIST_ENTRY(BusState) sibling;
ResettableState reset;
};
/**
- * GlobalProperty:
+ * typedef GlobalProperty - a global property type
+ *
* @used: Set to true if property was used when initializing a device.
* @optional: If set to true, GlobalProperty will be skipped without errors
* if the property doesn't exist.
@@ -324,7 +434,8 @@ compat_props_add(GPtrArray *arr,
* This only allocates the memory and initializes the device state
* structure, ready for the caller to set properties if they wish.
* The device still needs to be realized.
- * The returned object has a reference count of 1.
+ *
+ * Return: a derived DeviceState object with a reference count of 1.
*/
DeviceState *qdev_new(const char *name);
@@ -334,16 +445,18 @@ DeviceState *qdev_new(const char *name);
*
* This is like qdev_new(), except it returns %NULL when type @name
* does not exist, rather than asserting.
+ *
+ * Return: a derived DeviceState object with a reference count of 1 or
+ * NULL if type @name does not exist.
*/
DeviceState *qdev_try_new(const char *name);
/**
- * qdev_is_realized:
+ * qdev_is_realized() - check if device is realized
* @dev: The device to check.
*
- * May be called outside big qemu lock.
- *
- * Returns: %true% if the device has been fully constructed, %false% otherwise.
+ * Context: May be called outside big qemu lock.
+ * Return: true if the device has been fully constructed, false otherwise.
*/
static inline bool qdev_is_realized(DeviceState *dev)
{
@@ -361,11 +474,11 @@ static inline bool qdev_is_realized(DeviceState *dev)
* @dev must not be plugged into a bus already.
* If @bus, plug @dev into @bus. This takes a reference to @dev.
* If @dev has no QOM parent, make one up, taking another reference.
- * On success, return true.
- * On failure, store an error through @errp and return false.
*
* If you created @dev using qdev_new(), you probably want to use
* qdev_realize_and_unref() instead.
+ *
+ * Return: true on success, else false setting @errp with error
*/
bool qdev_realize(DeviceState *dev, BusState *bus, Error **errp);
@@ -392,6 +505,8 @@ bool qdev_realize(DeviceState *dev, BusState *bus, Error **errp);
* for the only reference to the child device to be held by the parent
* via the child<> property, and so the reference-count-drop done here
* would be incorrect. For that use case you want qdev_realize().
+ *
+ * Return: true on success, else false setting @errp with error
*/
bool qdev_realize_and_unref(DeviceState *dev, BusState *bus, Error **errp);
@@ -420,16 +535,16 @@ void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
HotplugHandler *qdev_get_bus_hotplug_handler(DeviceState *dev);
HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);
bool qdev_hotplug_allowed(DeviceState *dev, Error **errp);
+
/**
- * qdev_get_hotplug_handler: Get handler responsible for device wiring
- *
- * Find HOTPLUG_HANDLER for @dev that provides [pre|un]plug callbacks for it.
+ * qdev_get_hotplug_handler() - Get handler responsible for device wiring
+ * @dev: the device we want the HOTPLUG_HANDLER for.
*
* Note: in case @dev has a parent bus, it will be returned as handler unless
* machine handler overrides it.
*
- * Returns: pointer to object that implements TYPE_HOTPLUG_HANDLER interface
- * or NULL if there aren't any.
+ * Return: pointer to object that implements TYPE_HOTPLUG_HANDLER interface
+ * or NULL if there aren't any.
*/
HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev);
void qdev_unplug(DeviceState *dev, Error **errp);
@@ -459,15 +574,15 @@ void qdev_del_unplug_blocker(DeviceState *dev, Error *reason);
* qdev_unplug_blocked: Confirm if a device is blocked from unplug
*
* @dev: Device to be tested
- * @reason: Returns one of the reasons why the device is blocked,
- * if any
+ * @errp: The reasons why the device is blocked, if any
*
- * Returns: true if device is blocked from unplug, false otherwise
+ * Returns: true (also setting @errp) if device is blocked from unplug,
+ * false otherwise
*/
bool qdev_unplug_blocked(DeviceState *dev, Error **errp);
/**
- * GpioPolarity: Polarity of a GPIO line
+ * typedef GpioPolarity - Polarity of a GPIO line
*
* GPIO lines use either positive (active-high) logic,
* or negative (active-low) logic.
@@ -499,6 +614,8 @@ typedef enum {
* connect another device's output GPIO line to this input.
*
* For named input GPIO lines, use qdev_get_gpio_in_named().
+ *
+ * Return: qemu_irq corresponding to anonymous input GPIO line
*/
qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
@@ -516,6 +633,8 @@ qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
* array); this function will assert() if passed an invalid name or index.
*
* For anonymous input GPIO lines, use qdev_get_gpio_in().
+ *
+ * Return: qemu_irq corresponding to named input GPIO line
*/
qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
@@ -523,7 +642,7 @@ qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
* qdev_connect_gpio_out: Connect one of a device's anonymous output GPIO lines
* @dev: Device whose GPIO to connect
* @n: Number of the anonymous output GPIO line (which must be in range)
- * @input_pin: qemu_irq to connect the output line to
+ * @pin: qemu_irq to connect the output line to
*
* This function connects an anonymous output GPIO line on a device
* up to an arbitrary qemu_irq, so that when the device asserts that
@@ -594,6 +713,8 @@ void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
*
* You probably don't need to use this function -- it is used only
* by the platform-bus subsystem.
+ *
+ * Return: qemu_irq associated with GPIO or NULL if un-wired.
*/
qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
@@ -604,14 +725,17 @@ qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
* @name: Name of the output GPIO array
* @n: Number of the GPIO line in the array
*
- * This function is provided only for use by the qtest testing framework
- * and is not suitable for use in non-testing parts of QEMU.
+ * .. note::
+ * This function is provided only for use by the qtest testing framework
+ * and is not suitable for use in non-testing parts of QEMU.
*
* This function breaks an existing connection of an outbound GPIO
* line from @dev, and replaces it with the new qemu_irq @icpt, as if
* ``qdev_connect_gpio_out_named(dev, icpt, name, n)`` had been called.
* The previously connected qemu_irq is returned, so it can be restored
* by a second call to qdev_intercept_gpio_out() if desired.
+ *
+ * Return: old disconnected qemu_irq if one existed
*/
qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
const char *name, int n);
@@ -683,9 +807,7 @@ void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
const char *name, int n);
/**
- * qdev_init_gpio_in_named_with_opaque: create an array of input GPIO lines
- * for the specified device
- *
+ * qdev_init_gpio_in_named_with_opaque() - create an array of input GPIO lines
* @dev: Device to create input GPIOs for
* @handler: Function to call when GPIO line value is set
* @opaque: Opaque data pointer to pass to @handler
@@ -698,8 +820,11 @@ void qdev_init_gpio_in_named_with_opaque(DeviceState *dev,
const char *name, int n);
/**
- * qdev_init_gpio_in_named: create an array of input GPIO lines
- * for the specified device
+ * qdev_init_gpio_in_named() - create an array of input GPIO lines
+ * @dev: device to add array to
+ * @handler: a &typedef qemu_irq_handler function to call when GPIO is set
+ * @name: Name of the GPIO input (must be unique for this device)
+ * @n: Number of GPIO lines in this input set
*
* Like qdev_init_gpio_in_named_with_opaque(), but the opaque pointer
* passed to the handler is @dev (which is the most commonly desired behaviour).
@@ -762,14 +887,17 @@ int qdev_walk_children(DeviceState *dev,
void *opaque);
/**
- * device_cold_reset:
+ * device_cold_reset() - perform a recursive cold reset on a device
+ * @dev: device to reset.
+ *
* Reset device @dev and perform a recursive processing using the resettable
* interface. It triggers a RESET_TYPE_COLD.
*/
void device_cold_reset(DeviceState *dev);
/**
- * bus_cold_reset:
+ * bus_cold_reset() - perform a recursive cold reset on a bus
+ * @bus: bus to reset
*
* Reset bus @bus and perform a recursive processing using the resettable
* interface. It triggers a RESET_TYPE_COLD.
@@ -777,14 +905,18 @@ void device_cold_reset(DeviceState *dev);
void bus_cold_reset(BusState *bus);
/**
- * device_is_in_reset:
- * Return true if the device @dev is currently being reset.
+ * device_is_in_reset() - check device reset state
+ * @dev: device to check
+ *
+ * Return: true if the device @dev is currently being reset.
*/
bool device_is_in_reset(DeviceState *dev);
/**
- * bus_is_in_reset:
- * Return true if the bus @bus is currently being reset.
+ * bus_is_in_reset() - check bus reset state
+ * @bus: bus to check
+ *
+ * Return: true if the bus @bus is currently being reset.
*/
bool bus_is_in_reset(BusState *bus);
@@ -797,7 +929,14 @@ char *qdev_get_own_fw_dev_path_from_handler(BusState *bus, DeviceState *dev);
void device_class_set_props(DeviceClass *dc, Property *props);
/**
- * device_class_set_parent_reset:
+ * device_class_set_parent_reset() - legacy set device reset handlers
+ * @dc: device class
+ * @dev_reset: function pointer to reset handler
+ * @parent_reset: function pointer to parents reset handler
+ *
+ * Modern code should use the ResettableClass interface to
+ * implement a multi-phase reset instead.
+ *
* TODO: remove the function when DeviceClass's reset method
* is not used anymore.
*/
@@ -871,14 +1010,15 @@ void device_listener_register(DeviceListener *listener);
void device_listener_unregister(DeviceListener *listener);
/**
- * @qdev_should_hide_device:
+ * qdev_should_hide_device() - check if device should be hidden
+ *
* @opts: options QDict
* @from_json: true if @opts entries are typed, false for all strings
* @errp: pointer to error object
*
- * Check if a device should be added.
- * When a device is added via qdev_device_add() this will be called,
- * and return if the device should be added now or not.
+ * When a device is added via qdev_device_add() this will be called.
+ *
+ * Return: if the device should be added now or not.
*/
bool qdev_should_hide_device(const QDict *opts, bool from_json, Error **errp);