| /* |
| * Dynamic device configuration and creation. |
| * |
| * Copyright (c) 2009 CodeSourcery |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* The theory here is that it should be possible to create a machine without |
| knowledge of specific devices. Historically board init routines have |
| passed a bunch of arguments to each device, requiring the board know |
| exactly which device it is dealing with. This file provides an abstract |
| API for device configuration and initialization. Devices will generally |
| inherit from a particular bus (e.g. PCI or I2C) rather than |
| this API directly. */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qapi/qapi-events-qdev.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qerror.h" |
| #include "qapi/visitor.h" |
| #include "qemu/error-report.h" |
| #include "qemu/option.h" |
| #include "hw/irq.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/boards.h" |
| #include "hw/sysbus.h" |
| #include "hw/qdev-clock.h" |
| #include "migration/vmstate.h" |
| #include "trace.h" |
| |
| static bool qdev_hot_added = false; |
| bool qdev_hot_removed = false; |
| |
| const VMStateDescription *qdev_get_vmsd(DeviceState *dev) |
| { |
| DeviceClass *dc = DEVICE_GET_CLASS(dev); |
| return dc->vmsd; |
| } |
| |
| static void bus_free_bus_child(BusChild *kid) |
| { |
| object_unref(OBJECT(kid->child)); |
| g_free(kid); |
| } |
| |
| static void bus_remove_child(BusState *bus, DeviceState *child) |
| { |
| BusChild *kid; |
| |
| QTAILQ_FOREACH(kid, &bus->children, sibling) { |
| if (kid->child == child) { |
| char name[32]; |
| |
| snprintf(name, sizeof(name), "child[%d]", kid->index); |
| QTAILQ_REMOVE_RCU(&bus->children, kid, sibling); |
| |
| bus->num_children--; |
| |
| /* This gives back ownership of kid->child back to us. */ |
| object_property_del(OBJECT(bus), name); |
| |
| /* free the bus kid, when it is safe to do so*/ |
| call_rcu(kid, bus_free_bus_child, rcu); |
| break; |
| } |
| } |
| } |
| |
| static void bus_add_child(BusState *bus, DeviceState *child) |
| { |
| char name[32]; |
| BusChild *kid = g_malloc0(sizeof(*kid)); |
| |
| bus->num_children++; |
| kid->index = bus->max_index++; |
| kid->child = child; |
| object_ref(OBJECT(kid->child)); |
| |
| QTAILQ_INSERT_HEAD_RCU(&bus->children, kid, sibling); |
| |
| /* This transfers ownership of kid->child to the property. */ |
| snprintf(name, sizeof(name), "child[%d]", kid->index); |
| object_property_add_link(OBJECT(bus), name, |
| object_get_typename(OBJECT(child)), |
| (Object **)&kid->child, |
| NULL, /* read-only property */ |
| 0); |
| } |
| |
| static bool bus_check_address(BusState *bus, DeviceState *child, Error **errp) |
| { |
| BusClass *bc = BUS_GET_CLASS(bus); |
| return !bc->check_address || bc->check_address(bus, child, errp); |
| } |
| |
| bool qdev_set_parent_bus(DeviceState *dev, BusState *bus, Error **errp) |
| { |
| BusState *old_parent_bus = dev->parent_bus; |
| DeviceClass *dc = DEVICE_GET_CLASS(dev); |
| |
| assert(dc->bus_type && object_dynamic_cast(OBJECT(bus), dc->bus_type)); |
| |
| if (!bus_check_address(bus, dev, errp)) { |
| return false; |
| } |
| |
| if (old_parent_bus) { |
| trace_qdev_update_parent_bus(dev, object_get_typename(OBJECT(dev)), |
| old_parent_bus, object_get_typename(OBJECT(old_parent_bus)), |
| OBJECT(bus), object_get_typename(OBJECT(bus))); |
| /* |
| * Keep a reference to the device while it's not plugged into |
| * any bus, to avoid it potentially evaporating when it is |
| * dereffed in bus_remove_child(). |
| * Also keep the ref of the parent bus until the end, so that |
| * we can safely call resettable_change_parent() below. |
| */ |
| object_ref(OBJECT(dev)); |
| bus_remove_child(dev->parent_bus, dev); |
| } |
| dev->parent_bus = bus; |
| object_ref(OBJECT(bus)); |
| bus_add_child(bus, dev); |
| if (dev->realized) { |
| resettable_change_parent(OBJECT(dev), OBJECT(bus), |
| OBJECT(old_parent_bus)); |
| } |
| if (old_parent_bus) { |
| object_unref(OBJECT(old_parent_bus)); |
| object_unref(OBJECT(dev)); |
| } |
| return true; |
| } |
| |
| DeviceState *qdev_new(const char *name) |
| { |
| ObjectClass *oc = object_class_by_name(name); |
| #ifdef CONFIG_MODULES |
| if (!oc) { |
| int rv = module_load_qom(name, &error_fatal); |
| if (rv > 0) { |
| oc = object_class_by_name(name); |
| } else { |
| error_report("could not find a module for type '%s'", name); |
| exit(1); |
| } |
| } |
| #endif |
| if (!oc) { |
| error_report("unknown type '%s'", name); |
| abort(); |
| } |
| return DEVICE(object_new(name)); |
| } |
| |
| DeviceState *qdev_try_new(const char *name) |
| { |
| if (!module_object_class_by_name(name)) { |
| return NULL; |
| } |
| return DEVICE(object_new(name)); |
| } |
| |
| static QTAILQ_HEAD(, DeviceListener) device_listeners |
| = QTAILQ_HEAD_INITIALIZER(device_listeners); |
| |
| enum ListenerDirection { Forward, Reverse }; |
| |
| #define DEVICE_LISTENER_CALL(_callback, _direction, _args...) \ |
| do { \ |
| DeviceListener *_listener; \ |
| \ |
| switch (_direction) { \ |
| case Forward: \ |
| QTAILQ_FOREACH(_listener, &device_listeners, link) { \ |
| if (_listener->_callback) { \ |
| _listener->_callback(_listener, ##_args); \ |
| } \ |
| } \ |
| break; \ |
| case Reverse: \ |
| QTAILQ_FOREACH_REVERSE(_listener, &device_listeners, \ |
| link) { \ |
| if (_listener->_callback) { \ |
| _listener->_callback(_listener, ##_args); \ |
| } \ |
| } \ |
| break; \ |
| default: \ |
| abort(); \ |
| } \ |
| } while (0) |
| |
| static int device_listener_add(DeviceState *dev, void *opaque) |
| { |
| DEVICE_LISTENER_CALL(realize, Forward, dev); |
| |
| return 0; |
| } |
| |
| void device_listener_register(DeviceListener *listener) |
| { |
| QTAILQ_INSERT_TAIL(&device_listeners, listener, link); |
| |
| qbus_walk_children(sysbus_get_default(), NULL, NULL, device_listener_add, |
| NULL, NULL); |
| } |
| |
| void device_listener_unregister(DeviceListener *listener) |
| { |
| QTAILQ_REMOVE(&device_listeners, listener, link); |
| } |
| |
| bool qdev_should_hide_device(const QDict *opts, bool from_json, Error **errp) |
| { |
| ERRP_GUARD(); |
| DeviceListener *listener; |
| |
| QTAILQ_FOREACH(listener, &device_listeners, link) { |
| if (listener->hide_device) { |
| if (listener->hide_device(listener, opts, from_json, errp)) { |
| return true; |
| } else if (*errp) { |
| return false; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, |
| int required_for_version) |
| { |
| assert(!dev->realized); |
| dev->instance_id_alias = alias_id; |
| dev->alias_required_for_version = required_for_version; |
| } |
| |
| static int qdev_prereset(DeviceState *dev, void *opaque) |
| { |
| trace_qdev_reset_tree(dev, object_get_typename(OBJECT(dev))); |
| return 0; |
| } |
| |
| static int qbus_prereset(BusState *bus, void *opaque) |
| { |
| trace_qbus_reset_tree(bus, object_get_typename(OBJECT(bus))); |
| return 0; |
| } |
| |
| static int qdev_reset_one(DeviceState *dev, void *opaque) |
| { |
| device_legacy_reset(dev); |
| |
| return 0; |
| } |
| |
| static int qbus_reset_one(BusState *bus, void *opaque) |
| { |
| BusClass *bc = BUS_GET_CLASS(bus); |
| trace_qbus_reset(bus, object_get_typename(OBJECT(bus))); |
| if (bc->reset) { |
| bc->reset(bus); |
| } |
| return 0; |
| } |
| |
| void qdev_reset_all(DeviceState *dev) |
| { |
| trace_qdev_reset_all(dev, object_get_typename(OBJECT(dev))); |
| qdev_walk_children(dev, qdev_prereset, qbus_prereset, |
| qdev_reset_one, qbus_reset_one, NULL); |
| } |
| |
| void qdev_reset_all_fn(void *opaque) |
| { |
| qdev_reset_all(DEVICE(opaque)); |
| } |
| |
| void qbus_reset_all(BusState *bus) |
| { |
| trace_qbus_reset_all(bus, object_get_typename(OBJECT(bus))); |
| qbus_walk_children(bus, qdev_prereset, qbus_prereset, |
| qdev_reset_one, qbus_reset_one, NULL); |
| } |
| |
| void qbus_reset_all_fn(void *opaque) |
| { |
| BusState *bus = opaque; |
| qbus_reset_all(bus); |
| } |
| |
| void device_cold_reset(DeviceState *dev) |
| { |
| resettable_reset(OBJECT(dev), RESET_TYPE_COLD); |
| } |
| |
| bool device_is_in_reset(DeviceState *dev) |
| { |
| return resettable_is_in_reset(OBJECT(dev)); |
| } |
| |
| static ResettableState *device_get_reset_state(Object *obj) |
| { |
| DeviceState *dev = DEVICE(obj); |
| return &dev->reset; |
| } |
| |
| static void device_reset_child_foreach(Object *obj, ResettableChildCallback cb, |
| void *opaque, ResetType type) |
| { |
| DeviceState *dev = DEVICE(obj); |
| BusState *bus; |
| |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| cb(OBJECT(bus), opaque, type); |
| } |
| } |
| |
| bool qdev_realize(DeviceState *dev, BusState *bus, Error **errp) |
| { |
| assert(!dev->realized && !dev->parent_bus); |
| |
| if (bus) { |
| if (!qdev_set_parent_bus(dev, bus, errp)) { |
| return false; |
| } |
| } else { |
| assert(!DEVICE_GET_CLASS(dev)->bus_type); |
| } |
| |
| return object_property_set_bool(OBJECT(dev), "realized", true, errp); |
| } |
| |
| bool qdev_realize_and_unref(DeviceState *dev, BusState *bus, Error **errp) |
| { |
| bool ret; |
| |
| ret = qdev_realize(dev, bus, errp); |
| object_unref(OBJECT(dev)); |
| return ret; |
| } |
| |
| void qdev_unrealize(DeviceState *dev) |
| { |
| object_property_set_bool(OBJECT(dev), "realized", false, &error_abort); |
| } |
| |
| static int qdev_assert_realized_properly_cb(Object *obj, void *opaque) |
| { |
| DeviceState *dev = DEVICE(object_dynamic_cast(obj, TYPE_DEVICE)); |
| DeviceClass *dc; |
| |
| if (dev) { |
| dc = DEVICE_GET_CLASS(dev); |
| assert(dev->realized); |
| assert(dev->parent_bus || !dc->bus_type); |
| } |
| return 0; |
| } |
| |
| void qdev_assert_realized_properly(void) |
| { |
| object_child_foreach_recursive(object_get_root(), |
| qdev_assert_realized_properly_cb, NULL); |
| } |
| |
| bool qdev_machine_modified(void) |
| { |
| return qdev_hot_added || qdev_hot_removed; |
| } |
| |
| BusState *qdev_get_parent_bus(DeviceState *dev) |
| { |
| return dev->parent_bus; |
| } |
| |
| BusState *qdev_get_child_bus(DeviceState *dev, const char *name) |
| { |
| BusState *bus; |
| Object *child = object_resolve_path_component(OBJECT(dev), name); |
| |
| bus = (BusState *)object_dynamic_cast(child, TYPE_BUS); |
| if (bus) { |
| return bus; |
| } |
| |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| if (strcmp(name, bus->name) == 0) { |
| return bus; |
| } |
| } |
| return NULL; |
| } |
| |
| int qdev_walk_children(DeviceState *dev, |
| qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn, |
| qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn, |
| void *opaque) |
| { |
| BusState *bus; |
| int err; |
| |
| if (pre_devfn) { |
| err = pre_devfn(dev, opaque); |
| if (err) { |
| return err; |
| } |
| } |
| |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| err = qbus_walk_children(bus, pre_devfn, pre_busfn, |
| post_devfn, post_busfn, opaque); |
| if (err < 0) { |
| return err; |
| } |
| } |
| |
| if (post_devfn) { |
| err = post_devfn(dev, opaque); |
| if (err) { |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| DeviceState *qdev_find_recursive(BusState *bus, const char *id) |
| { |
| BusChild *kid; |
| DeviceState *ret; |
| BusState *child; |
| |
| WITH_RCU_READ_LOCK_GUARD() { |
| QTAILQ_FOREACH_RCU(kid, &bus->children, sibling) { |
| DeviceState *dev = kid->child; |
| |
| if (dev->id && strcmp(dev->id, id) == 0) { |
| return dev; |
| } |
| |
| QLIST_FOREACH(child, &dev->child_bus, sibling) { |
| ret = qdev_find_recursive(child, id); |
| if (ret) { |
| return ret; |
| } |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| char *qdev_get_dev_path(DeviceState *dev) |
| { |
| BusClass *bc; |
| |
| if (!dev || !dev->parent_bus) { |
| return NULL; |
| } |
| |
| bc = BUS_GET_CLASS(dev->parent_bus); |
| if (bc->get_dev_path) { |
| return bc->get_dev_path(dev); |
| } |
| |
| return NULL; |
| } |
| |
| void qdev_add_unplug_blocker(DeviceState *dev, Error *reason) |
| { |
| dev->unplug_blockers = g_slist_prepend(dev->unplug_blockers, reason); |
| } |
| |
| void qdev_del_unplug_blocker(DeviceState *dev, Error *reason) |
| { |
| dev->unplug_blockers = g_slist_remove(dev->unplug_blockers, reason); |
| } |
| |
| bool qdev_unplug_blocked(DeviceState *dev, Error **errp) |
| { |
| ERRP_GUARD(); |
| |
| if (dev->unplug_blockers) { |
| error_propagate(errp, error_copy(dev->unplug_blockers->data)); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool device_get_realized(Object *obj, Error **errp) |
| { |
| DeviceState *dev = DEVICE(obj); |
| return dev->realized; |
| } |
| |
| static bool check_only_migratable(Object *obj, Error **errp) |
| { |
| DeviceClass *dc = DEVICE_GET_CLASS(obj); |
| |
| if (!vmstate_check_only_migratable(dc->vmsd)) { |
| error_setg(errp, "Device %s is not migratable, but " |
| "--only-migratable was specified", |
| object_get_typename(obj)); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static void device_set_realized(Object *obj, bool value, Error **errp) |
| { |
| DeviceState *dev = DEVICE(obj); |
| DeviceClass *dc = DEVICE_GET_CLASS(dev); |
| HotplugHandler *hotplug_ctrl; |
| BusState *bus; |
| NamedClockList *ncl; |
| Error *local_err = NULL; |
| bool unattached_parent = false; |
| static int unattached_count; |
| |
| if (dev->hotplugged && !dc->hotpluggable) { |
| error_setg(errp, QERR_DEVICE_NO_HOTPLUG, object_get_typename(obj)); |
| return; |
| } |
| |
| if (value && !dev->realized) { |
| if (!check_only_migratable(obj, errp)) { |
| goto fail; |
| } |
| |
| if (!obj->parent) { |
| gchar *name = g_strdup_printf("device[%d]", unattached_count++); |
| |
| object_property_add_child(container_get(qdev_get_machine(), |
| "/unattached"), |
| name, obj); |
| unattached_parent = true; |
| g_free(name); |
| } |
| |
| hotplug_ctrl = qdev_get_hotplug_handler(dev); |
| if (hotplug_ctrl) { |
| hotplug_handler_pre_plug(hotplug_ctrl, dev, &local_err); |
| if (local_err != NULL) { |
| goto fail; |
| } |
| } |
| |
| if (dc->realize) { |
| dc->realize(dev, &local_err); |
| if (local_err != NULL) { |
| goto fail; |
| } |
| } |
| |
| DEVICE_LISTENER_CALL(realize, Forward, dev); |
| |
| /* |
| * always free/re-initialize here since the value cannot be cleaned up |
| * in device_unrealize due to its usage later on in the unplug path |
| */ |
| g_free(dev->canonical_path); |
| dev->canonical_path = object_get_canonical_path(OBJECT(dev)); |
| QLIST_FOREACH(ncl, &dev->clocks, node) { |
| if (ncl->alias) { |
| continue; |
| } else { |
| clock_setup_canonical_path(ncl->clock); |
| } |
| } |
| |
| if (qdev_get_vmsd(dev)) { |
| if (vmstate_register_with_alias_id(VMSTATE_IF(dev), |
| VMSTATE_INSTANCE_ID_ANY, |
| qdev_get_vmsd(dev), dev, |
| dev->instance_id_alias, |
| dev->alias_required_for_version, |
| &local_err) < 0) { |
| goto post_realize_fail; |
| } |
| } |
| |
| /* |
| * Clear the reset state, in case the object was previously unrealized |
| * with a dirty state. |
| */ |
| resettable_state_clear(&dev->reset); |
| |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| if (!qbus_realize(bus, errp)) { |
| goto child_realize_fail; |
| } |
| } |
| if (dev->hotplugged) { |
| /* |
| * Reset the device, as well as its subtree which, at this point, |
| * should be realized too. |
| */ |
| resettable_assert_reset(OBJECT(dev), RESET_TYPE_COLD); |
| resettable_change_parent(OBJECT(dev), OBJECT(dev->parent_bus), |
| NULL); |
| resettable_release_reset(OBJECT(dev), RESET_TYPE_COLD); |
| } |
| dev->pending_deleted_event = false; |
| |
| if (hotplug_ctrl) { |
| hotplug_handler_plug(hotplug_ctrl, dev, &local_err); |
| if (local_err != NULL) { |
| goto child_realize_fail; |
| } |
| } |
| |
| qatomic_store_release(&dev->realized, value); |
| |
| } else if (!value && dev->realized) { |
| |
| /* |
| * Change the value so that any concurrent users are aware |
| * that the device is going to be unrealized |
| * |
| * TODO: change .realized property to enum that states |
| * each phase of the device realization/unrealization |
| */ |
| |
| qatomic_set(&dev->realized, value); |
| /* |
| * Ensure that concurrent users see this update prior to |
| * any other changes done by unrealize. |
| */ |
| smp_wmb(); |
| |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| qbus_unrealize(bus); |
| } |
| if (qdev_get_vmsd(dev)) { |
| vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev); |
| } |
| if (dc->unrealize) { |
| dc->unrealize(dev); |
| } |
| dev->pending_deleted_event = true; |
| DEVICE_LISTENER_CALL(unrealize, Reverse, dev); |
| } |
| |
| assert(local_err == NULL); |
| return; |
| |
| child_realize_fail: |
| QLIST_FOREACH(bus, &dev->child_bus, sibling) { |
| qbus_unrealize(bus); |
| } |
| |
| if (qdev_get_vmsd(dev)) { |
| vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev); |
| } |
| |
| post_realize_fail: |
| g_free(dev->canonical_path); |
| dev->canonical_path = NULL; |
| if (dc->unrealize) { |
| dc->unrealize(dev); |
| } |
| |
| fail: |
| error_propagate(errp, local_err); |
| if (unattached_parent) { |
| /* |
| * Beware, this doesn't just revert |
| * object_property_add_child(), it also runs bus_remove()! |
| */ |
| object_unparent(OBJECT(dev)); |
| unattached_count--; |
| } |
| } |
| |
| static bool device_get_hotpluggable(Object *obj, Error **errp) |
| { |
| DeviceClass *dc = DEVICE_GET_CLASS(obj); |
| DeviceState *dev = DEVICE(obj); |
| |
| return dc->hotpluggable && (dev->parent_bus == NULL || |
| qbus_is_hotpluggable(dev->parent_bus)); |
| } |
| |
| static bool device_get_hotplugged(Object *obj, Error **errp) |
| { |
| DeviceState *dev = DEVICE(obj); |
| |
| return dev->hotplugged; |
| } |
| |
| static void device_initfn(Object *obj) |
| { |
| DeviceState *dev = DEVICE(obj); |
| |
| if (phase_check(PHASE_MACHINE_READY)) { |
| dev->hotplugged = 1; |
| qdev_hot_added = true; |
| } |
| |
| dev->instance_id_alias = -1; |
| dev->realized = false; |
| dev->allow_unplug_during_migration = false; |
| |
| QLIST_INIT(&dev->gpios); |
| QLIST_INIT(&dev->clocks); |
| } |
| |
| static void device_post_init(Object *obj) |
| { |
| /* |
| * Note: ordered so that the user's global properties take |
| * precedence. |
| */ |
| object_apply_compat_props(obj); |
| qdev_prop_set_globals(DEVICE(obj)); |
| } |
| |
| /* Unlink device from bus and free the structure. */ |
| static void device_finalize(Object *obj) |
| { |
| NamedGPIOList *ngl, *next; |
| |
| DeviceState *dev = DEVICE(obj); |
| |
| g_assert(!dev->unplug_blockers); |
| |
| QLIST_FOREACH_SAFE(ngl, &dev->gpios, node, next) { |
| QLIST_REMOVE(ngl, node); |
| qemu_free_irqs(ngl->in, ngl->num_in); |
| g_free(ngl->name); |
| g_free(ngl); |
| /* ngl->out irqs are owned by the other end and should not be freed |
| * here |
| */ |
| } |
| |
| qdev_finalize_clocklist(dev); |
| |
| /* Only send event if the device had been completely realized */ |
| if (dev->pending_deleted_event) { |
| g_assert(dev->canonical_path); |
| |
| qapi_event_send_device_deleted(!!dev->id, dev->id, dev->canonical_path); |
| g_free(dev->canonical_path); |
| dev->canonical_path = NULL; |
| } |
| |
| qobject_unref(dev->opts); |
| g_free(dev->id); |
| } |
| |
| static void device_class_base_init(ObjectClass *class, void *data) |
| { |
| DeviceClass *klass = DEVICE_CLASS(class); |
| |
| /* We explicitly look up properties in the superclasses, |
| * so do not propagate them to the subclasses. |
| */ |
| klass->props_ = NULL; |
| } |
| |
| static void device_unparent(Object *obj) |
| { |
| DeviceState *dev = DEVICE(obj); |
| BusState *bus; |
| |
| if (dev->realized) { |
| qdev_unrealize(dev); |
| } |
| while (dev->num_child_bus) { |
| bus = QLIST_FIRST(&dev->child_bus); |
| object_unparent(OBJECT(bus)); |
| } |
| if (dev->parent_bus) { |
| bus_remove_child(dev->parent_bus, dev); |
| object_unref(OBJECT(dev->parent_bus)); |
| dev->parent_bus = NULL; |
| } |
| } |
| |
| static char * |
| device_vmstate_if_get_id(VMStateIf *obj) |
| { |
| DeviceState *dev = DEVICE(obj); |
| |
| return qdev_get_dev_path(dev); |
| } |
| |
| /** |
| * device_phases_reset: |
| * Transition reset method for devices to allow moving |
| * smoothly from legacy reset method to multi-phases |
| */ |
| static void device_phases_reset(DeviceState *dev) |
| { |
| ResettableClass *rc = RESETTABLE_GET_CLASS(dev); |
| |
| if (rc->phases.enter) { |
| rc->phases.enter(OBJECT(dev), RESET_TYPE_COLD); |
| } |
| if (rc->phases.hold) { |
| rc->phases.hold(OBJECT(dev)); |
| } |
| if (rc->phases.exit) { |
| rc->phases.exit(OBJECT(dev)); |
| } |
| } |
| |
| static void device_transitional_reset(Object *obj) |
| { |
| DeviceClass *dc = DEVICE_GET_CLASS(obj); |
| |
| /* |
| * This will call either @device_phases_reset (for multi-phases transitioned |
| * devices) or a device's specific method for not-yet transitioned devices. |
| * In both case, it does not reset children. |
| */ |
| if (dc->reset) { |
| dc->reset(DEVICE(obj)); |
| } |
| } |
| |
| /** |
| * device_get_transitional_reset: |
| * check if the device's class is ready for multi-phase |
| */ |
| static ResettableTrFunction device_get_transitional_reset(Object *obj) |
| { |
| DeviceClass *dc = DEVICE_GET_CLASS(obj); |
| if (dc->reset != device_phases_reset) { |
| /* |
| * dc->reset has been overridden by a subclass, |
| * the device is not ready for multi phase yet. |
| */ |
| return device_transitional_reset; |
| } |
| return NULL; |
| } |
| |
| static void device_class_init(ObjectClass *class, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(class); |
| VMStateIfClass *vc = VMSTATE_IF_CLASS(class); |
| ResettableClass *rc = RESETTABLE_CLASS(class); |
| |
| class->unparent = device_unparent; |
| |
| /* by default all devices were considered as hotpluggable, |
| * so with intent to check it in generic qdev_unplug() / |
| * device_set_realized() functions make every device |
| * hotpluggable. Devices that shouldn't be hotpluggable, |
| * should override it in their class_init() |
| */ |
| dc->hotpluggable = true; |
| dc->user_creatable = true; |
| vc->get_id = device_vmstate_if_get_id; |
| rc->get_state = device_get_reset_state; |
| rc->child_foreach = device_reset_child_foreach; |
| |
| /* |
| * @device_phases_reset is put as the default reset method below, allowing |
| * to do the multi-phase transition from base classes to leaf classes. It |
| * allows a legacy-reset Device class to extend a multi-phases-reset |
| * Device class for the following reason: |
| * + If a base class B has been moved to multi-phase, then it does not |
| * override this default reset method and may have defined phase methods. |
| * + A child class C (extending class B) which uses |
| * device_class_set_parent_reset() (or similar means) to override the |
| * reset method will still work as expected. @device_phases_reset function |
| * will be registered as the parent reset method and effectively call |
| * parent reset phases. |
| */ |
| dc->reset = device_phases_reset; |
| rc->get_transitional_function = device_get_transitional_reset; |
| |
| object_class_property_add_bool(class, "realized", |
| device_get_realized, device_set_realized); |
| object_class_property_add_bool(class, "hotpluggable", |
| device_get_hotpluggable, NULL); |
| object_class_property_add_bool(class, "hotplugged", |
| device_get_hotplugged, NULL); |
| object_class_property_add_link(class, "parent_bus", TYPE_BUS, |
| offsetof(DeviceState, parent_bus), NULL, 0); |
| } |
| |
| void device_class_set_parent_reset(DeviceClass *dc, |
| DeviceReset dev_reset, |
| DeviceReset *parent_reset) |
| { |
| *parent_reset = dc->reset; |
| dc->reset = dev_reset; |
| } |
| |
| void device_class_set_parent_realize(DeviceClass *dc, |
| DeviceRealize dev_realize, |
| DeviceRealize *parent_realize) |
| { |
| *parent_realize = dc->realize; |
| dc->realize = dev_realize; |
| } |
| |
| void device_class_set_parent_unrealize(DeviceClass *dc, |
| DeviceUnrealize dev_unrealize, |
| DeviceUnrealize *parent_unrealize) |
| { |
| *parent_unrealize = dc->unrealize; |
| dc->unrealize = dev_unrealize; |
| } |
| |
| void device_legacy_reset(DeviceState *dev) |
| { |
| DeviceClass *klass = DEVICE_GET_CLASS(dev); |
| |
| trace_qdev_reset(dev, object_get_typename(OBJECT(dev))); |
| if (klass->reset) { |
| klass->reset(dev); |
| } |
| } |
| |
| Object *qdev_get_machine(void) |
| { |
| static Object *dev; |
| |
| if (dev == NULL) { |
| dev = container_get(object_get_root(), "/machine"); |
| } |
| |
| return dev; |
| } |
| |
| static MachineInitPhase machine_phase; |
| |
| bool phase_check(MachineInitPhase phase) |
| { |
| return machine_phase >= phase; |
| } |
| |
| void phase_advance(MachineInitPhase phase) |
| { |
| assert(machine_phase == phase - 1); |
| machine_phase = phase; |
| } |
| |
| static const TypeInfo device_type_info = { |
| .name = TYPE_DEVICE, |
| .parent = TYPE_OBJECT, |
| .instance_size = sizeof(DeviceState), |
| .instance_init = device_initfn, |
| .instance_post_init = device_post_init, |
| .instance_finalize = device_finalize, |
| .class_base_init = device_class_base_init, |
| .class_init = device_class_init, |
| .abstract = true, |
| .class_size = sizeof(DeviceClass), |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_VMSTATE_IF }, |
| { TYPE_RESETTABLE_INTERFACE }, |
| { } |
| } |
| }; |
| |
| static void qdev_register_types(void) |
| { |
| type_register_static(&device_type_info); |
| } |
| |
| type_init(qdev_register_types) |
