qbus_set_hotplug_handler() is a simple wrapper around object_property_set_link(). object_property_set_link() fails when the property doesn't exist, is not settable, or its .check() method fails. These are all programming errors here, so passing &error_abort to qbus_set_hotplug_handler() is appropriate. Most of its callers do. Exceptions: * pcie_cap_slot_init(), shpc_init(), spapr_phb_realize() pass NULL, i.e. they ignore errors. * spapr_machine_init() passes &error_fatal. * s390_pcihost_realize(), virtio_serial_device_realize(), s390_pcihost_plug() pass the error to their callers. The latter two keep going after the error, which looks wrong. Drop the @errp parameter, and instead pass &error_abort to object_property_set_link(). Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Daniel P. Berrangé" <berrange@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200630090351.1247703-15-armbru@redhat.com>
560 lines
19 KiB
C
560 lines
19 KiB
C
#ifndef QDEV_CORE_H
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#define QDEV_CORE_H
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#include "qemu/queue.h"
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#include "qemu/bitmap.h"
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#include "qom/object.h"
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#include "hw/hotplug.h"
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#include "hw/resettable.h"
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enum {
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DEV_NVECTORS_UNSPECIFIED = -1,
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};
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#define TYPE_DEVICE "device"
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#define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)
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#define DEVICE_CLASS(klass) OBJECT_CLASS_CHECK(DeviceClass, (klass), TYPE_DEVICE)
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#define DEVICE_GET_CLASS(obj) OBJECT_GET_CLASS(DeviceClass, (obj), TYPE_DEVICE)
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typedef enum DeviceCategory {
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DEVICE_CATEGORY_BRIDGE,
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DEVICE_CATEGORY_USB,
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DEVICE_CATEGORY_STORAGE,
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DEVICE_CATEGORY_NETWORK,
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DEVICE_CATEGORY_INPUT,
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DEVICE_CATEGORY_DISPLAY,
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DEVICE_CATEGORY_SOUND,
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DEVICE_CATEGORY_MISC,
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DEVICE_CATEGORY_CPU,
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DEVICE_CATEGORY_MAX
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} DeviceCategory;
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typedef void (*DeviceRealize)(DeviceState *dev, Error **errp);
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typedef void (*DeviceUnrealize)(DeviceState *dev);
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typedef void (*DeviceReset)(DeviceState *dev);
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typedef void (*BusRealize)(BusState *bus, Error **errp);
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typedef void (*BusUnrealize)(BusState *bus);
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/**
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* DeviceClass:
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* @props: Properties accessing state fields.
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* @realize: Callback function invoked when the #DeviceState:realized
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* property is changed to %true.
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* @unrealize: Callback function invoked when the #DeviceState:realized
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* property is changed to %false.
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* @hotpluggable: indicates if #DeviceClass is hotpluggable, available
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* as readonly "hotpluggable" property of #DeviceState instance
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*
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* # Realization #
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* Devices are constructed in two stages,
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* 1) object instantiation via object_initialize() and
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* 2) device realization via #DeviceState:realized property.
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* The former may not fail (and must not abort or exit, since it is called
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* during device introspection already), and the latter may return error
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* information to the caller and must be re-entrant.
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* Trivial field initializations should go into #TypeInfo.instance_init.
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* Operations depending on @props static properties should go into @realize.
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* After successful realization, setting static properties will fail.
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*
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* As an interim step, the #DeviceState:realized property can also be
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* set with qdev_realize().
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* In the future, devices will propagate this state change to their children
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* and along busses they expose.
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* The point in time will be deferred to machine creation, so that values
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* set in @realize will not be introspectable beforehand. Therefore devices
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* must not create children during @realize; they should initialize them via
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* object_initialize() in their own #TypeInfo.instance_init and forward the
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* realization events appropriately.
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*
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* Any type may override the @realize and/or @unrealize callbacks but needs
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* to call the parent type's implementation if keeping their functionality
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* is desired. Refer to QOM documentation for further discussion and examples.
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*
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* <note>
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* <para>
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* Since TYPE_DEVICE doesn't implement @realize and @unrealize, types
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* derived directly from it need not call their parent's @realize and
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* @unrealize.
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* For other types consult the documentation and implementation of the
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* respective parent types.
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* </para>
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* </note>
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*
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* # Hiding a device #
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* To hide a device, a DeviceListener function should_be_hidden() needs to
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* be registered.
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* It can be used to defer adding a device and therefore hide it from the
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* guest. The handler registering to this DeviceListener can save the QOpts
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* passed to it for re-using it later and must return that it wants the device
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* to be/remain hidden or not. When the handler function decides the device
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* shall not be hidden it will be added in qdev_device_add() and
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* realized as any other device. Otherwise qdev_device_add() will return early
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* without adding the device. The guest will not see a "hidden" device
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* until it was marked don't hide and qdev_device_add called again.
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*
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*/
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typedef struct DeviceClass {
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/*< private >*/
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ObjectClass parent_class;
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/*< public >*/
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DECLARE_BITMAP(categories, DEVICE_CATEGORY_MAX);
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const char *fw_name;
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const char *desc;
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/*
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* The underscore at the end ensures a compile-time error if someone
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* assigns to dc->props instead of using device_class_set_props.
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*/
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Property *props_;
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/*
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* Can this device be instantiated with -device / device_add?
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* All devices should support instantiation with device_add, and
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* this flag should not exist. But we're not there, yet. Some
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* devices fail to instantiate with cryptic error messages.
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* Others instantiate, but don't work. Exposing users to such
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* behavior would be cruel; clearing this flag will protect them.
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* It should never be cleared without a comment explaining why it
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* is cleared.
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* TODO remove once we're there
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*/
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bool user_creatable;
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bool hotpluggable;
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/* callbacks */
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/*
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* Reset method here is deprecated and replaced by methods in the
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* resettable class interface to implement a multi-phase reset.
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* TODO: remove once every reset callback is unused
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*/
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DeviceReset reset;
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DeviceRealize realize;
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DeviceUnrealize unrealize;
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/* device state */
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const VMStateDescription *vmsd;
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/* Private to qdev / bus. */
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const char *bus_type;
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} DeviceClass;
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typedef struct NamedGPIOList NamedGPIOList;
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struct NamedGPIOList {
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char *name;
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qemu_irq *in;
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int num_in;
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int num_out;
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QLIST_ENTRY(NamedGPIOList) node;
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};
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typedef struct Clock Clock;
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typedef struct NamedClockList NamedClockList;
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struct NamedClockList {
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char *name;
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Clock *clock;
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bool output;
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bool alias;
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QLIST_ENTRY(NamedClockList) node;
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};
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/**
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* DeviceState:
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* @realized: Indicates whether the device has been fully constructed.
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* @reset: ResettableState for the device; handled by Resettable interface.
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*
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* This structure should not be accessed directly. We declare it here
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* so that it can be embedded in individual device state structures.
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*/
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struct DeviceState {
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/*< private >*/
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Object parent_obj;
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/*< public >*/
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const char *id;
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char *canonical_path;
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bool realized;
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bool pending_deleted_event;
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QemuOpts *opts;
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int hotplugged;
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bool allow_unplug_during_migration;
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BusState *parent_bus;
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QLIST_HEAD(, NamedGPIOList) gpios;
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QLIST_HEAD(, NamedClockList) clocks;
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QLIST_HEAD(, BusState) child_bus;
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int num_child_bus;
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int instance_id_alias;
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int alias_required_for_version;
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ResettableState reset;
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};
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struct DeviceListener {
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void (*realize)(DeviceListener *listener, DeviceState *dev);
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void (*unrealize)(DeviceListener *listener, DeviceState *dev);
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/*
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* This callback is called upon init of the DeviceState and allows to
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* inform qdev that a device should be hidden, depending on the device
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* opts, for example, to hide a standby device.
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*/
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int (*should_be_hidden)(DeviceListener *listener, QemuOpts *device_opts);
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QTAILQ_ENTRY(DeviceListener) link;
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};
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#define TYPE_BUS "bus"
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#define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS)
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#define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS)
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#define BUS_GET_CLASS(obj) OBJECT_GET_CLASS(BusClass, (obj), TYPE_BUS)
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struct BusClass {
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ObjectClass parent_class;
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/* FIXME first arg should be BusState */
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void (*print_dev)(Monitor *mon, DeviceState *dev, int indent);
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char *(*get_dev_path)(DeviceState *dev);
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/*
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* This callback is used to create Open Firmware device path in accordance
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* with OF spec http://forthworks.com/standards/of1275.pdf. Individual bus
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* bindings can be found at http://playground.sun.com/1275/bindings/.
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*/
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char *(*get_fw_dev_path)(DeviceState *dev);
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void (*reset)(BusState *bus);
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BusRealize realize;
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BusUnrealize unrealize;
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/* maximum devices allowed on the bus, 0: no limit. */
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int max_dev;
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/* number of automatically allocated bus ids (e.g. ide.0) */
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int automatic_ids;
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};
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typedef struct BusChild {
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DeviceState *child;
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int index;
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QTAILQ_ENTRY(BusChild) sibling;
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} BusChild;
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#define QDEV_HOTPLUG_HANDLER_PROPERTY "hotplug-handler"
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/**
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* BusState:
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* @hotplug_handler: link to a hotplug handler associated with bus.
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* @reset: ResettableState for the bus; handled by Resettable interface.
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*/
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struct BusState {
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Object obj;
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DeviceState *parent;
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char *name;
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HotplugHandler *hotplug_handler;
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int max_index;
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bool realized;
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int num_children;
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QTAILQ_HEAD(, BusChild) children;
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QLIST_ENTRY(BusState) sibling;
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ResettableState reset;
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};
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/**
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* Property:
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* @set_default: true if the default value should be set from @defval,
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* in which case @info->set_default_value must not be NULL
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* (if false then no default value is set by the property system
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* and the field retains whatever value it was given by instance_init).
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* @defval: default value for the property. This is used only if @set_default
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* is true.
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*/
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struct Property {
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const char *name;
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const PropertyInfo *info;
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ptrdiff_t offset;
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uint8_t bitnr;
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bool set_default;
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union {
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int64_t i;
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uint64_t u;
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} defval;
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int arrayoffset;
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const PropertyInfo *arrayinfo;
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int arrayfieldsize;
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const char *link_type;
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};
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struct PropertyInfo {
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const char *name;
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const char *description;
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const QEnumLookup *enum_table;
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int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
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void (*set_default_value)(ObjectProperty *op, const Property *prop);
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void (*create)(ObjectClass *oc, Property *prop);
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ObjectPropertyAccessor *get;
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ObjectPropertyAccessor *set;
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ObjectPropertyRelease *release;
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};
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/**
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* GlobalProperty:
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* @used: Set to true if property was used when initializing a device.
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* @optional: If set to true, GlobalProperty will be skipped without errors
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* if the property doesn't exist.
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*
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* An error is fatal for non-hotplugged devices, when the global is applied.
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*/
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typedef struct GlobalProperty {
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const char *driver;
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const char *property;
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const char *value;
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bool used;
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bool optional;
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} GlobalProperty;
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static inline void
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compat_props_add(GPtrArray *arr,
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GlobalProperty props[], size_t nelem)
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{
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int i;
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for (i = 0; i < nelem; i++) {
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g_ptr_array_add(arr, (void *)&props[i]);
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}
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}
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/*** Board API. This should go away once we have a machine config file. ***/
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DeviceState *qdev_new(const char *name);
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DeviceState *qdev_try_new(const char *name);
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bool qdev_realize(DeviceState *dev, BusState *bus, Error **errp);
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bool qdev_realize_and_unref(DeviceState *dev, BusState *bus, Error **errp);
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void qdev_unrealize(DeviceState *dev);
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void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
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int required_for_version);
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HotplugHandler *qdev_get_bus_hotplug_handler(DeviceState *dev);
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HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);
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bool qdev_hotplug_allowed(DeviceState *dev, Error **errp);
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/**
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* qdev_get_hotplug_handler: Get handler responsible for device wiring
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*
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* Find HOTPLUG_HANDLER for @dev that provides [pre|un]plug callbacks for it.
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*
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* Note: in case @dev has a parent bus, it will be returned as handler unless
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* machine handler overrides it.
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*
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* Returns: pointer to object that implements TYPE_HOTPLUG_HANDLER interface
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* or NULL if there aren't any.
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*/
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HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev);
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void qdev_unplug(DeviceState *dev, Error **errp);
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void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
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DeviceState *dev, Error **errp);
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void qdev_machine_creation_done(void);
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bool qdev_machine_modified(void);
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qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
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qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
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void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
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void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
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qemu_irq pin);
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qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
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qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
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const char *name, int n);
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BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
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/*** Device API. ***/
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/* Register device properties. */
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/* GPIO inputs also double as IRQ sinks. */
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void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
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void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
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void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,
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const char *name, int n);
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/**
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* qdev_init_gpio_in_named_with_opaque: create an array of input GPIO lines
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* for the specified device
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*
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* @dev: Device to create input GPIOs for
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* @handler: Function to call when GPIO line value is set
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* @opaque: Opaque data pointer to pass to @handler
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* @name: Name of the GPIO input (must be unique for this device)
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* @n: Number of GPIO lines in this input set
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*/
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void qdev_init_gpio_in_named_with_opaque(DeviceState *dev,
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qemu_irq_handler handler,
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void *opaque,
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const char *name, int n);
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/**
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* qdev_init_gpio_in_named: create an array of input GPIO lines
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* for the specified device
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*
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* Like qdev_init_gpio_in_named_with_opaque(), but the opaque pointer
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* passed to the handler is @dev (which is the most commonly desired behaviour).
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*/
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static inline void qdev_init_gpio_in_named(DeviceState *dev,
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qemu_irq_handler handler,
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const char *name, int n)
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{
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qdev_init_gpio_in_named_with_opaque(dev, handler, dev, name, n);
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}
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void qdev_pass_gpios(DeviceState *dev, DeviceState *container,
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const char *name);
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BusState *qdev_get_parent_bus(DeviceState *dev);
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/*** BUS API. ***/
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DeviceState *qdev_find_recursive(BusState *bus, const char *id);
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/* Returns 0 to walk children, > 0 to skip walk, < 0 to terminate walk. */
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typedef int (qbus_walkerfn)(BusState *bus, void *opaque);
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typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
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void qbus_create_inplace(void *bus, size_t size, const char *typename,
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DeviceState *parent, const char *name);
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BusState *qbus_create(const char *typename, DeviceState *parent, const char *name);
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bool qbus_realize(BusState *bus, Error **errp);
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void qbus_unrealize(BusState *bus);
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/* Returns > 0 if either devfn or busfn skip walk somewhere in cursion,
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* < 0 if either devfn or busfn terminate walk somewhere in cursion,
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* 0 otherwise. */
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int qbus_walk_children(BusState *bus,
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qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
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qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
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void *opaque);
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int qdev_walk_children(DeviceState *dev,
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qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn,
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qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
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void *opaque);
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/**
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* @qdev_reset_all:
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* Reset @dev. See @qbus_reset_all() for more details.
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*
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* Note: This function is deprecated and will be removed when it becomes unused.
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* Please use device_cold_reset() now.
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*/
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void qdev_reset_all(DeviceState *dev);
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void qdev_reset_all_fn(void *opaque);
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/**
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* @qbus_reset_all:
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* @bus: Bus to be reset.
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*
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* Reset @bus and perform a bus-level ("hard") reset of all devices connected
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* to it, including recursive processing of all buses below @bus itself. A
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* hard reset means that qbus_reset_all will reset all state of the device.
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* For PCI devices, for example, this will include the base address registers
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* or configuration space.
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*
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* Note: This function is deprecated and will be removed when it becomes unused.
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* Please use bus_cold_reset() now.
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*/
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void qbus_reset_all(BusState *bus);
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void qbus_reset_all_fn(void *opaque);
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/**
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* device_cold_reset:
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* Reset device @dev and perform a recursive processing using the resettable
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* interface. It triggers a RESET_TYPE_COLD.
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*/
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void device_cold_reset(DeviceState *dev);
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/**
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* bus_cold_reset:
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*
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* Reset bus @bus and perform a recursive processing using the resettable
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* interface. It triggers a RESET_TYPE_COLD.
|
|
*/
|
|
void bus_cold_reset(BusState *bus);
|
|
|
|
/**
|
|
* device_is_in_reset:
|
|
* 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.
|
|
*/
|
|
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);
|
|
|
|
/**
|
|
* @qdev_machine_init
|
|
*
|
|
* Initialize platform devices before machine init. This is a hack until full
|
|
* support for composition is added.
|
|
*/
|
|
void qdev_machine_init(void);
|
|
|
|
/**
|
|
* device_legacy_reset:
|
|
*
|
|
* Reset a single device (by calling the reset method).
|
|
* Note: This function is deprecated and will be removed when it becomes unused.
|
|
* Please use device_cold_reset() now.
|
|
*/
|
|
void device_legacy_reset(DeviceState *dev);
|
|
|
|
void device_class_set_props(DeviceClass *dc, Property *props);
|
|
|
|
/**
|
|
* device_class_set_parent_reset:
|
|
* 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);
|
|
void device_class_set_parent_realize(DeviceClass *dc,
|
|
DeviceRealize dev_realize,
|
|
DeviceRealize *parent_realize);
|
|
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);
|
|
|
|
Object *qdev_get_machine(void);
|
|
|
|
/* FIXME: make this a link<> */
|
|
void qdev_set_parent_bus(DeviceState *dev, BusState *bus);
|
|
|
|
extern bool qdev_hotplug;
|
|
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)
|
|
{
|
|
return bus->hotplug_handler;
|
|
}
|
|
|
|
void device_listener_register(DeviceListener *listener);
|
|
void device_listener_unregister(DeviceListener *listener);
|
|
|
|
/**
|
|
* @qdev_should_hide_device:
|
|
* @opts: QemuOpts as passed on cmdline.
|
|
*
|
|
* 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.
|
|
*/
|
|
bool qdev_should_hide_device(QemuOpts *opts);
|
|
|
|
#endif
|