blob: 151d9682380d292357a5b28c77824e15050fcb55 [file] [log] [blame]
#ifndef QDEV_CORE_H
#define QDEV_CORE_H
#include "qemu/atomic.h"
#include "qemu/queue.h"
#include "qemu/bitmap.h"
#include "qemu/rcu.h"
#include "qemu/rcu_queue.h"
#include "qom/object.h"
#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,
};
#define TYPE_DEVICE "device"
OBJECT_DECLARE_TYPE(DeviceState, DeviceClass, DEVICE)
typedef enum DeviceCategory {
DEVICE_CATEGORY_BRIDGE,
DEVICE_CATEGORY_USB,
DEVICE_CATEGORY_STORAGE,
DEVICE_CATEGORY_NETWORK,
DEVICE_CATEGORY_INPUT,
DEVICE_CATEGORY_DISPLAY,
DEVICE_CATEGORY_SOUND,
DEVICE_CATEGORY_MISC,
DEVICE_CATEGORY_CPU,
DEVICE_CATEGORY_WATCHDOG,
DEVICE_CATEGORY_MAX
} DeviceCategory;
typedef void (*DeviceRealize)(DeviceState *dev, Error **errp);
typedef void (*DeviceUnrealize)(DeviceState *dev);
typedef void (*DeviceReset)(DeviceState *dev);
typedef void (*BusRealize)(BusState *bus, Error **errp);
typedef void (*BusUnrealize)(BusState *bus);
/**
* 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.
* @unrealize: Callback function invoked when the #DeviceState:realized
* property is changed to %false.
* @hotpluggable: indicates if #DeviceClass is hotpluggable, available
* as readonly "hotpluggable" property of #DeviceState instance
*
*/
struct DeviceClass {
/* private: */
ObjectClass parent_class;
/* 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;
/**
* @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_;
/**
* @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.
* Others instantiate, but don't work. Exposing users to such
* 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: 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;
/**
* @vmsd: device state serialisation description for
* migration/save/restore
*/
const VMStateDescription *vmsd;
/**
* @bus_type: bus type
* private: to qdev / bus.
*/
const char *bus_type;
};
typedef struct NamedGPIOList NamedGPIOList;
struct NamedGPIOList {
char *name;
qemu_irq *in;
int num_in;
int num_out;
QLIST_ENTRY(NamedGPIOList) node;
};
typedef struct Clock Clock;
typedef struct NamedClockList NamedClockList;
struct NamedClockList {
char *name;
Clock *clock;
bool output;
bool alias;
QLIST_ENTRY(NamedClockList) node;
};
typedef struct {
bool engaged_in_io;
} MemReentrancyGuard;
typedef QLIST_HEAD(, NamedGPIOList) NamedGPIOListHead;
typedef QLIST_HEAD(, NamedClockList) NamedClockListHead;
typedef QLIST_HEAD(, BusState) BusStateHead;
/**
* 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: */
Object parent_obj;
/* 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;
/**
* @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;
/**
* @mem_reentrancy_guard: Is the device currently in mmio/pio/dma?
*
* Used to prevent re-entrancy confusing things.
*/
MemReentrancyGuard mem_reentrancy_guard;
};
struct DeviceListener {
void (*realize)(DeviceListener *listener, DeviceState *dev);
void (*unrealize)(DeviceListener *listener, DeviceState *dev);
/*
* This callback is called upon init of the DeviceState and
* informs qdev if a device should be visible or hidden. We can
* hide a failover device depending for example on the device
* opts.
*
* On errors, it returns false and errp is set. Device creation
* should fail in this case.
*/
bool (*hide_device)(DeviceListener *listener, const QDict *device_opts,
bool from_json, Error **errp);
QTAILQ_ENTRY(DeviceListener) link;
};
#define TYPE_BUS "bus"
DECLARE_OBJ_CHECKERS(BusState, BusClass,
BUS, TYPE_BUS)
struct BusClass {
ObjectClass parent_class;
/* FIXME first arg should be BusState */
void (*print_dev)(Monitor *mon, DeviceState *dev, int indent);
char *(*get_dev_path)(DeviceState *dev);
/*
* This callback is used to create Open Firmware device path in accordance
* with OF spec http://forthworks.com/standards/of1275.pdf. Individual bus
* bindings can be found at http://playground.sun.com/1275/bindings/.
*/
char *(*get_fw_dev_path)(DeviceState *dev);
void (*reset)(BusState *bus);
/*
* Return whether the device can be added to @bus,
* based on the address that was set (via device properties)
* before realize. If not, on return @errp contains the
* human-readable error message.
*/
bool (*check_address)(BusState *bus, DeviceState *dev, Error **errp);
BusRealize realize;
BusUnrealize unrealize;
/* maximum devices allowed on the bus, 0: no limit. */
int max_dev;
/* number of automatically allocated bus ids (e.g. ide.0) */
int automatic_ids;
};
typedef struct BusChild {
struct rcu_head rcu;
DeviceState *child;
int index;
QTAILQ_ENTRY(BusChild) sibling;
} BusChild;
#define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
typedef QTAILQ_HEAD(, BusChild) BusChildHead;
typedef QLIST_ENTRY(BusState) BusStateEntry;
/**
* struct BusState:
* @obj: parent object
* @parent: parent Device
* @name: name of bus
* @hotplug_handler: link to a hotplug handler associated with bus.
* @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;
int max_index;
bool realized;
bool full;
int num_children;
/**
* @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.
*/
ResettableState reset;
};
/**
* 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.
*
* An error is fatal for non-hotplugged devices, when the global is applied.
*/
typedef struct GlobalProperty {
const char *driver;
const char *property;
const char *value;
bool used;
bool optional;
} GlobalProperty;
static inline void
compat_props_add(GPtrArray *arr,
GlobalProperty props[], size_t nelem)
{
int i;
for (i = 0; i < nelem; i++) {
g_ptr_array_add(arr, (void *)&props[i]);
}
}
/*** Board API. This should go away once we have a machine config file. ***/
/**
* qdev_new: Create a device on the heap
* @name: device type to create (we assert() that this type exists)
*
* 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.
*
* Return: a derived DeviceState object with a reference count of 1.
*/
DeviceState *qdev_new(const char *name);
/**
* qdev_try_new: Try to create a device on the heap
* @name: device type to create
*
* 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() - check if device is realized
* @dev: The device to check.
*
* 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)
{
return qatomic_load_acquire(&dev->realized);
}
/**
* qdev_realize: Realize @dev.
* @dev: device to realize
* @bus: bus to plug it into (may be NULL)
* @errp: pointer to error object
*
* "Realize" the device, i.e. perform the second phase of device
* initialization.
* @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.
*
* 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);
/**
* qdev_realize_and_unref: Realize @dev and drop a reference
* @dev: device to realize
* @bus: bus to plug it into (may be NULL)
* @errp: pointer to error object
*
* Realize @dev and drop a reference.
* This is like qdev_realize(), except the caller must hold a
* (private) reference, which is dropped on return regardless of
* success or failure. Intended use::
*
* dev = qdev_new();
* [...]
* qdev_realize_and_unref(dev, bus, errp);
*
* Now @dev can go away without further ado.
*
* If you are embedding the device into some other QOM device and
* initialized it via some variant on object_initialize_child() then
* do not use this function, because that family of functions arrange
* 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);
/**
* qdev_unrealize: Unrealize a device
* @dev: device to unrealize
*
* This function will "unrealize" a device, which is the first phase
* of correctly destroying a device that has been realized. It will:
*
* - unrealize any child buses by calling qbus_unrealize()
* (this will recursively unrealize any devices on those buses)
* - call the unrealize method of @dev
*
* The device can then be freed by causing its reference count to go
* to zero.
*
* Warning: most devices in QEMU do not expect to be unrealized. Only
* devices which are hot-unpluggable should be unrealized (as part of
* the unplugging process); all other devices are expected to last for
* the life of the simulation and should not be unrealized and freed.
*/
void qdev_unrealize(DeviceState *dev);
void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
int required_for_version);
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
* @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.
*
* 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);
void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp);
void qdev_machine_creation_done(void);
bool qdev_machine_modified(void);
/**
* qdev_add_unplug_blocker: Add an unplug blocker to a device
*
* @dev: Device to be blocked from unplug
* @reason: Reason for blocking
*/
void qdev_add_unplug_blocker(DeviceState *dev, Error *reason);
/**
* qdev_del_unplug_blocker: Remove an unplug blocker from a device
*
* @dev: Device to be unblocked
* @reason: Pointer to the Error used with qdev_add_unplug_blocker.
* Used as a handle to lookup the blocker for deletion.
*/
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
* @errp: The reasons why the device is blocked, if any
*
* Returns: true (also setting @errp) if device is blocked from unplug,
* false otherwise
*/
bool qdev_unplug_blocked(DeviceState *dev, Error **errp);
/**
* typedef GpioPolarity - Polarity of a GPIO line
*
* GPIO lines use either positive (active-high) logic,
* or negative (active-low) logic.
*
* In active-high logic (%GPIO_POLARITY_ACTIVE_HIGH), a pin is
* active when the voltage on the pin is high (relative to ground);
* whereas in active-low logic (%GPIO_POLARITY_ACTIVE_LOW), a pin
* is active when the voltage on the pin is low (or grounded).
*/
typedef enum {
GPIO_POLARITY_ACTIVE_LOW,
GPIO_POLARITY_ACTIVE_HIGH
} GpioPolarity;
/**
* qdev_get_gpio_in: Get one of a device's anonymous input GPIO lines
* @dev: Device whose GPIO we want
* @n: Number of the anonymous GPIO line (which must be in range)
*
* Returns the qemu_irq corresponding to an anonymous input GPIO line
* (which the device has set up with qdev_init_gpio_in()). The index
* @n of the GPIO line must be valid (i.e. be at least 0 and less than
* the total number of anonymous input GPIOs the device has); this
* function will assert() if passed an invalid index.
*
* This function is intended to be used by board code or SoC "container"
* device models to wire up the GPIO lines; usually the return value
* will be passed to qdev_connect_gpio_out() or a similar function to
* 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);
/**
* qdev_get_gpio_in_named: Get one of a device's named input GPIO lines
* @dev: Device whose GPIO we want
* @name: Name of the input GPIO array
* @n: Number of the GPIO line in that array (which must be in range)
*
* Returns the qemu_irq corresponding to a named input GPIO line
* (which the device has set up with qdev_init_gpio_in_named()).
* The @name string must correspond to an input GPIO array which exists on
* the device, and the index @n of the GPIO line must be valid (i.e.
* be at least 0 and less than the total number of input GPIOs in that
* 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);
/**
* 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)
* @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
* output GPIO line, the qemu_irq's callback is invoked.
* The index @n of the GPIO line must be valid (i.e. be at least 0 and
* less than the total number of anonymous output GPIOs the device has
* created with qdev_init_gpio_out()); otherwise this function will assert().
*
* Outbound GPIO lines can be connected to any qemu_irq, but the common
* case is connecting them to another device's inbound GPIO line, using
* the qemu_irq returned by qdev_get_gpio_in() or qdev_get_gpio_in_named().
*
* It is not valid to try to connect one outbound GPIO to multiple
* qemu_irqs at once, or to connect multiple outbound GPIOs to the
* same qemu_irq. (Warning: there is no assertion or other guard to
* catch this error: the model will just not do the right thing.)
* Instead, for fan-out you can use the TYPE_SPLIT_IRQ device: connect
* a device's outbound GPIO to the splitter's input, and connect each
* of the splitter's outputs to a different device. For fan-in you
* can use the TYPE_OR_IRQ device, which is a model of a logical OR
* gate with multiple inputs and one output.
*
* For named output GPIO lines, use qdev_connect_gpio_out_named().
*/
void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
/**
* qdev_connect_gpio_out_named: Connect one of a device's named output
* GPIO lines
* @dev: Device whose GPIO to connect
* @name: Name of the output GPIO array
* @n: Number of the anonymous output GPIO line (which must be in range)
* @input_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
* output GPIO line, the qemu_irq's callback is invoked.
* The @name string must correspond to an output GPIO array which exists on
* the device, and the index @n of the GPIO line must be valid (i.e.
* be at least 0 and less than the total number of input GPIOs in that
* array); this function will assert() if passed an invalid name or index.
*
* Outbound GPIO lines can be connected to any qemu_irq, but the common
* case is connecting them to another device's inbound GPIO line, using
* the qemu_irq returned by qdev_get_gpio_in() or qdev_get_gpio_in_named().
*
* It is not valid to try to connect one outbound GPIO to multiple
* qemu_irqs at once, or to connect multiple outbound GPIOs to the
* same qemu_irq; see qdev_connect_gpio_out() for details.
*
* For anonymous output GPIO lines, use qdev_connect_gpio_out().
*/
void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
qemu_irq input_pin);
/**
* qdev_get_gpio_out_connector: Get the qemu_irq connected to an output GPIO
* @dev: Device whose output GPIO we are interested in
* @name: Name of the output GPIO array
* @n: Number of the output GPIO line within that array
*
* Returns whatever qemu_irq is currently connected to the specified
* output GPIO line of @dev. This will be NULL if the output GPIO line
* has never been wired up to the anything. Note that the qemu_irq
* returned does not belong to @dev -- it will be the input GPIO or
* IRQ of whichever device the board code has connected up to @dev's
* output GPIO.
*
* 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);
/**
* qdev_intercept_gpio_out: Intercept an existing GPIO connection
* @dev: Device to intercept the outbound GPIO line from
* @icpt: New qemu_irq to connect instead
* @name: Name of the output GPIO array
* @n: Number of the GPIO line in the array
*
* .. 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);
BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
/*** Device API. ***/
/**
* qdev_init_gpio_in: create an array of anonymous input GPIO lines
* @dev: Device to create input GPIOs for
* @handler: Function to call when GPIO line value is set
* @n: Number of GPIO lines to create
*
* Devices should use functions in the qdev_init_gpio_in* family in
* their instance_init or realize methods to create any input GPIO
* lines they need. There is no functional difference between
* anonymous and named GPIO lines. Stylistically, named GPIOs are
* preferable (easier to understand at callsites) unless a device
* has exactly one uniform kind of GPIO input whose purpose is obvious.
* Note that input GPIO lines can serve as 'sinks' for IRQ lines.
*
* See qdev_get_gpio_in() for how code that uses such a device can get
* hold of an input GPIO line to manipulate it.
*/
void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
/**
* qdev_init_gpio_out: create an array of anonymous output GPIO lines
* @dev: Device to create output GPIOs for
* @pins: Pointer to qemu_irq or qemu_irq array for the GPIO lines
* @n: Number of GPIO lines to create
*
* Devices should use functions in the qdev_init_gpio_out* family
* in their instance_init or realize methods to create any output
* GPIO lines they need. There is no functional difference between
* anonymous and named GPIO lines. Stylistically, named GPIOs are
* preferable (easier to understand at callsites) unless a device
* has exactly one uniform kind of GPIO output whose purpose is obvious.
*
* The @pins argument should be a pointer to either a "qemu_irq"
* (if @n == 1) or a "qemu_irq []" array (if @n > 1) in the device's
* state structure. The device implementation can then raise and
* lower the GPIO line by calling qemu_set_irq(). (If anything is
* connected to the other end of the GPIO this will cause the handler
* function for that input GPIO to be called.)
*
* See qdev_connect_gpio_out() for how code that uses such a device
* can connect to one of its output GPIO lines.
*
* There is no need to release the @pins allocated array because it
* will be automatically released when @dev calls its instance_finalize()
* handler.
*/
void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
/**
* qdev_init_gpio_out_named: create an array of named output GPIO lines
* @dev: Device to create output GPIOs for
* @pins: Pointer to qemu_irq or qemu_irq array for the GPIO lines
* @name: Name to give this array of GPIO lines
* @n: Number of GPIO lines to create
*
* Like qdev_init_gpio_out(), but creates an array of GPIO output lines
* with a name. Code using the device can then connect these GPIO lines
* using qdev_connect_gpio_out_named().
*/
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
* @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
* @name: Name of the GPIO input (must be unique for this device)
* @n: Number of GPIO lines in this input set
*/
void qdev_init_gpio_in_named_with_opaque(DeviceState *dev,
qemu_irq_handler handler,
void *opaque,
const char *name, int n);
/**
* 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).
*/
static inline void qdev_init_gpio_in_named(DeviceState *dev,
qemu_irq_handler handler,
const char *name, int n)
{
qdev_init_gpio_in_named_with_opaque(dev, handler, dev, name, n);
}
/**
* qdev_pass_gpios: create GPIO lines on container which pass through to device
* @dev: Device which has GPIO lines
* @container: Container device which needs to expose them
* @name: Name of GPIO array to pass through (NULL for the anonymous GPIO array)
*
* In QEMU, complicated devices like SoCs are often modelled with a
* "container" QOM device which itself contains other QOM devices and
* which wires them up appropriately. This function allows the container
* to create GPIO arrays on itself which simply pass through to a GPIO
* array of one of its internal devices.
*
* If @dev has both input and output GPIOs named @name then both will
* be passed through. It is not possible to pass a subset of the array
* with this function.
*
* To users of the container device, the GPIO array created on @container
* behaves exactly like any other.
*/
void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
const char *name);
BusState *qdev_get_parent_bus(const DeviceState *dev);
/*** BUS API. ***/
DeviceState *qdev_find_recursive(BusState *bus, const char *id);
/* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
void qbus_init(void *bus, size_t size, const char *typename,
DeviceState *parent, const char *name);
BusState *qbus_new(const char *typename, DeviceState *parent, const char *name);
bool qbus_realize(BusState *bus, Error **errp);
void qbus_unrealize(BusState *bus);
/* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
* < 0 if either devfn or busfn terminate walk somewhere in cursion,
* 0 otherwise. */
int qbus_walk_children(BusState *bus,
qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
void *opaque);
int qdev_walk_children(DeviceState *dev,
qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
void *opaque);
/**
* 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() - 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.
*/
void bus_cold_reset(BusState *bus);
/**
* 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() - 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);
/* This should go away once we get rid of the NULL bus hack */
BusState *sysbus_get_default(void);
char *qdev_get_fw_dev_path(DeviceState *dev);
char *qdev_get_own_fw_dev_path_from_handler(BusState *bus, DeviceState *dev);
/**
* device_class_set_props(): add a set of properties to an device
* @dc: the parent DeviceClass all devices inherit
* @props: an array of properties, terminate by DEFINE_PROP_END_OF_LIST()
*
* This will add a set of properties to the object. It will fault if
* you attempt to add an existing property defined by a parent class.
* To modify an inherited property you need to use????
*/
void device_class_set_props(DeviceClass *dc, Property *props);
/**
* 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.
*/
void device_class_set_parent_reset(DeviceClass *dc,
DeviceReset dev_reset,
DeviceReset *parent_reset);
/**
* device_class_set_parent_realize() - set up for chaining realize fns
* @dc: The device class
* @dev_realize: the device realize function
* @parent_realize: somewhere to save the parents realize function
*
* This is intended to be used when the new realize function will
* eventually call its parent realization function during creation.
* This requires storing the function call somewhere (usually in the
* instance structure) so you can eventually call
* dc->parent_realize(dev, errp)
*/
void device_class_set_parent_realize(DeviceClass *dc,
DeviceRealize dev_realize,
DeviceRealize *parent_realize);
/**
* device_class_set_parent_unrealize() - set up for chaining unrealize fns
* @dc: The device class
* @dev_unrealize: the device realize function
* @parent_unrealize: somewhere to save the parents unrealize function
*
* This is intended to be used when the new unrealize function will
* eventually call its parent unrealization function during the
* unrealize phase. This requires storing the function call somewhere
* (usually in the instance structure) so you can eventually call
* dc->parent_unrealize(dev);
*/
void device_class_set_parent_unrealize(DeviceClass *dc,
DeviceUnrealize dev_unrealize,
DeviceUnrealize *parent_unrealize);
const VMStateDescription *qdev_get_vmsd(DeviceState *dev);
const char *qdev_fw_name(DeviceState *dev);
void qdev_assert_realized_properly(void);
Object *qdev_get_machine(void);
/* FIXME: make this a link<> */
bool qdev_set_parent_bus(DeviceState *dev, BusState *bus, Error **errp);
extern bool qdev_hot_removed;
char *qdev_get_dev_path(DeviceState *dev);
void qbus_set_hotplug_handler(BusState *bus, Object *handler);
void qbus_set_bus_hotplug_handler(BusState *bus);
static inline bool qbus_is_hotpluggable(BusState *bus)
{
HotplugHandler *plug_handler = bus->hotplug_handler;
bool ret = !!plug_handler;
if (plug_handler) {
HotplugHandlerClass *hdc;
hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
if (hdc->is_hotpluggable_bus) {
ret = hdc->is_hotpluggable_bus(plug_handler, bus);
}
}
return ret;
}
/**
* qbus_mark_full: Mark this bus as full, so no more devices can be attached
* @bus: Bus to mark as full
*
* By default, QEMU will allow devices to be plugged into a bus up
* to the bus class's device count limit. Calling this function
* marks a particular bus as full, so that no more devices can be
* plugged into it. In particular this means that the bus will not
* be considered as a candidate for plugging in devices created by
* the user on the commandline or via the monitor.
* If a machine has multiple buses of a given type, such as I2C,
* where some of those buses in the real hardware are used only for
* internal devices and some are exposed via expansion ports, you
* can use this function to mark the internal-only buses as full
* after you have created all their internal devices. Then user
* created devices will appear on the expansion-port bus where
* guest software expects them.
*/
static inline void qbus_mark_full(BusState *bus)
{
bus->full = true;
}
void device_listener_register(DeviceListener *listener);
void device_listener_unregister(DeviceListener *listener);
/**
* 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
*
* 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);
typedef enum MachineInitPhase {
/* current_machine is NULL. */
PHASE_NO_MACHINE,
/* current_machine is not NULL, but current_machine->accel is NULL. */
PHASE_MACHINE_CREATED,
/*
* current_machine->accel is not NULL, but the machine properties have
* not been validated and machine_class->init has not yet been called.
*/
PHASE_ACCEL_CREATED,
/*
* machine_class->init has been called, thus creating any embedded
* devices and validating machine properties. Devices created at
* this time are considered to be cold-plugged.
*/
PHASE_MACHINE_INITIALIZED,
/*
* QEMU is ready to start CPUs and devices created at this time
* are considered to be hot-plugged. The monitor is not restricted
* to "preconfig" commands.
*/
PHASE_MACHINE_READY,
} MachineInitPhase;
bool phase_check(MachineInitPhase phase);
void phase_advance(MachineInitPhase phase);
#endif