C++ qdev_get_parent_bus函数代码示例

/*
 * In addition to updating the iplstate, this function returns:
 * - 0 if system was ipled with external kernel
 * - -1 if no valid boot device was found
 * - ccw id of the boot device otherwise
 */
static uint64_t s390_update_iplstate(S390IPLState *ipl)
{
    DeviceState *dev_st;

    if (ipl->iplb_valid) {
        ipl->cssid = 0;
        ipl->ssid = 0;
        ipl->devno = ipl->iplb.devno;
        goto out;
    }

    if (ipl->kernel) {
        return 0;
    }

    dev_st = get_boot_device(0);
    if (dev_st) {
        VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
            OBJECT(qdev_get_parent_bus(dev_st)->parent),
                TYPE_VIRTIO_CCW_DEVICE);
        if (ccw_dev) {
            ipl->cssid = ccw_dev->sch->cssid;
            ipl->ssid = ccw_dev->sch->ssid;
            ipl->devno = ccw_dev->sch->devno;
            goto out;
        }
    }

    return -1;
out:
    return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
}

static void apic_common_realize(struct uc_struct *uc, DeviceState *dev, Error **errp)
{
    APICCommonState *s = APIC_COMMON(uc, dev);
    APICCommonClass *info;

    if (uc->apic_no >= MAX_APICS) {
        error_setg(errp, "%s initialization failed.",
                   object_get_typename(OBJECT(dev)));
        return;
    }
    s->idx = uc->apic_no++;

    info = APIC_COMMON_GET_CLASS(uc, s);
    info->realize(uc, dev, errp);
    if (!uc->mmio_registered) {
        ICCBus *b = ICC_BUS(uc, qdev_get_parent_bus(dev));
        memory_region_add_subregion(b->apic_address_space, 0, &s->io_memory);
        uc->mmio_registered = true;
    }

    /* Note: We need at least 1M to map the VAPIC option ROM */
    if (!uc->vapic && s->vapic_control & VAPIC_ENABLE_MASK) {
        // ram_size >= 1024 * 1024) {	// FIXME
        uc->vapic = NULL;
    }
    s->vapic = uc->vapic;
    if (uc->apic_report_tpr_access && info->enable_tpr_reporting) {
        info->enable_tpr_reporting(s, true);
    }
}

static void vhost_vsock_stop(VirtIODevice *vdev)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    int ret;

    if (!k->set_guest_notifiers) {
        return;
    }

    ret = vhost_vsock_set_running(vsock, 0);
    if (ret < 0) {
        error_report("vhost vsock set running failed: %d", ret);
        return;
    }

    vhost_dev_stop(&vsock->vhost_dev, vdev);

    ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
    if (ret < 0) {
        error_report("vhost guest notifier cleanup failed: %d", ret);
        return;
    }

    vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
}

/* Plug the VirtIODevice */
int virtio_bus_plug_device(VirtIODevice *vdev)
{
    DeviceState *qdev = DEVICE(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(qdev));
    VirtioBusState *bus = VIRTIO_BUS(qbus);
    VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
    DPRINTF("%s: plug device.\n", qbus->name);

    bus->vdev = vdev;

    /*
     * The lines below will disappear when we drop VirtIOBindings, at the end
     * of the series.
     */
    bus->bindings.notify = klass->notify;
    bus->bindings.save_config = klass->save_config;
    bus->bindings.save_queue = klass->save_queue;
    bus->bindings.load_config = klass->load_config;
    bus->bindings.load_queue = klass->load_queue;
    bus->bindings.load_done = klass->load_done;
    bus->bindings.get_features = klass->get_features;
    bus->bindings.query_guest_notifiers = klass->query_guest_notifiers;
    bus->bindings.set_guest_notifiers = klass->set_guest_notifiers;
    bus->bindings.set_host_notifier = klass->set_host_notifier;
    bus->bindings.vmstate_change = klass->vmstate_change;
    virtio_bind_device(bus->vdev, &bus->bindings, qbus->parent);

    if (klass->device_plugged != NULL) {
        klass->device_plugged(qbus->parent);
    }

    return 0;
}

static CcwDevice *s390_get_ccw_device(DeviceState *dev_st)
{
    CcwDevice *ccw_dev = NULL;

    if (dev_st) {
        VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *)
            object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent),
                                TYPE_VIRTIO_CCW_DEVICE);
        if (virtio_ccw_dev) {
            ccw_dev = CCW_DEVICE(virtio_ccw_dev);
        } else {
            SCSIDevice *sd = (SCSIDevice *)
                object_dynamic_cast(OBJECT(dev_st),
                                    TYPE_SCSI_DEVICE);
            if (sd) {
                SCSIBus *bus = scsi_bus_from_device(sd);
                VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus);
                VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw,
                                                       vdev);

                ccw_dev = (CcwDevice *)object_dynamic_cast(OBJECT(scsi_ccw),
                                                           TYPE_CCW_DEVICE);
            }
        }
    }
    return ccw_dev;
}

static void s390_ipl_reset(DeviceState *dev)
{
    S390IPLState *ipl = S390_IPL(dev);
    S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
    CPUS390XState *env = &cpu->env;

    env->psw.addr = ipl->start_addr;
    env->psw.mask = IPL_PSW_MASK;

    if (!ipl->kernel) {
        /* Tell firmware, if there is a preferred boot device */
        env->regs[7] = -1;
        DeviceState *dev_st = get_boot_device(0);
        if (dev_st) {
            VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
                OBJECT(qdev_get_parent_bus(dev_st)->parent),
                TYPE_VIRTIO_CCW_DEVICE);

            if (ccw_dev) {
                env->regs[7] = ccw_dev->sch->cssid << 24 |
                               ccw_dev->sch->ssid << 16 |
                               ccw_dev->sch->devno;
            }
        }
    }

    s390_add_running_cpu(cpu);
}

static void apic_common_realize(DeviceState *dev, Error **errp)
{
    APICCommonState *s = APIC_COMMON(dev);
    APICCommonClass *info;
    static DeviceState *vapic;
    static int apic_no;
    static bool mmio_registered;

    if (apic_no >= MAX_APICS) {
        error_setg(errp, "%s initialization failed.",
                   object_get_typename(OBJECT(dev)));
        return;
    }
    s->idx = apic_no++;

    info = APIC_COMMON_GET_CLASS(s);
    info->realize(dev, errp);
    if (!mmio_registered) {
        ICCBus *b = ICC_BUS(qdev_get_parent_bus(dev));
        memory_region_add_subregion(b->apic_address_space, 0, &s->io_memory);
        mmio_registered = true;
    }

    /* Note: We need at least 1M to map the VAPIC option ROM */
    if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK &&
        ram_size >= 1024 * 1024) {
        vapic = sysbus_create_simple("kvmvapic", -1, NULL);
    }
    s->vapic = vapic;
    if (apic_report_tpr_access && info->enable_tpr_reporting) {
        info->enable_tpr_reporting(s, true);
    }

}

/* Context: QEMU global mutex held */
void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
                                  VirtIOBlockDataPlane **dataplane,
                                  Error **errp)
{
    VirtIOBlockDataPlane *s;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);

    *dataplane = NULL;

    if (!conf->iothread) {
        return;
    }

    /* Don't try if transport does not support notifiers. */
    if (!k->set_guest_notifiers || !k->set_host_notifier) {
        error_setg(errp,
                   "device is incompatible with dataplane "
                   "(transport does not support notifiers)");
        return;
    }

    /* If dataplane is (re-)enabled while the guest is running there could be
     * block jobs that can conflict.
     */
    if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
        error_prepend(errp, "cannot start dataplane thread: ");
        return;
    }

    s = g_new0(VirtIOBlockDataPlane, 1);
    s->vdev = vdev;
    s->conf = conf;

    if (conf->iothread) {
        s->iothread = conf->iothread;
        object_ref(OBJECT(s->iothread));
    }
    s->ctx = iothread_get_aio_context(s->iothread);
    s->bh = aio_bh_new(s->ctx, notify_guest_bh, s);

    error_setg(&s->blocker, "block device is in use by data plane");
    blk_op_block_all(conf->conf.blk, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
                   s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR_SOURCE, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker);
    blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker);

    *dataplane = s;
}

static bool s390_gen_initial_iplb(S390IPLState *ipl)
{
    DeviceState *dev_st;

    dev_st = get_boot_device(0);
    if (dev_st) {
        VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *)
            object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent),
                TYPE_VIRTIO_CCW_DEVICE);
        SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st),
                                                            TYPE_SCSI_DEVICE);
        VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st),
                                                          TYPE_VIRTIO_NET);

        if (vn) {
            ipl->netboot = true;
        }
        if (virtio_ccw_dev) {
            CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev);

            ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN);
            ipl->iplb.blk0_len =
                cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN);
            ipl->iplb.pbt = S390_IPL_TYPE_CCW;
            ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno);
            ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3;
        } else if (sd) {
            SCSIBus *bus = scsi_bus_from_device(sd);
            VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus);
            VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw, vdev);
            CcwDevice *ccw_dev;

            ccw_dev = (CcwDevice *)object_dynamic_cast(OBJECT(scsi_ccw),
                                                       TYPE_CCW_DEVICE);
            if (!ccw_dev) {       /* It might be a PCI device instead */
                return false;
            }

            ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN);
            ipl->iplb.blk0_len =
                cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN - S390_IPLB_HEADER_LEN);
            ipl->iplb.pbt = S390_IPL_TYPE_QEMU_SCSI;
            ipl->iplb.scsi.lun = cpu_to_be32(sd->lun);
            ipl->iplb.scsi.target = cpu_to_be16(sd->id);
            ipl->iplb.scsi.channel = cpu_to_be16(sd->channel);
            ipl->iplb.scsi.devno = cpu_to_be16(ccw_dev->sch->devno);
            ipl->iplb.scsi.ssid = ccw_dev->sch->ssid & 3;
        } else {
            return false; /* unknown device */
        }

        if (!s390_ipl_set_loadparm(ipl->iplb.loadparm)) {
            ipl->iplb.flags |= DIAG308_FLAGS_LP_VALID;
        }
        return true;
    }

    return false;
}

/*
 * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
 *
 * This function is only for special cases such as the 'ferr', and
 * temporary use for normal devices until they are converted to qdev.
 */
qemu_irq isa_get_irq(ISADevice *dev, int isairq)
{
    assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
    if (isairq < 0 || isairq > 15) {
        hw_error("isa irq %d invalid", isairq);
    }
    return isabus->irqs[isairq];
}

/* Context: QEMU global mutex held */
void virtio_scsi_dataplane_start(VirtIOSCSI *s)
{
    int i;
    int rc;
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);

    if (s->dataplane_started ||
        s->dataplane_starting ||
        s->dataplane_fenced ||
        s->ctx != iothread_get_aio_context(vs->conf.iothread)) {
        return;
    }

    s->dataplane_starting = true;

    /* Set up guest notifier (irq) */
    rc = k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, true);
    if (rc != 0) {
        fprintf(stderr, "virtio-scsi: Failed to set guest notifiers (%d), "
                "ensure -enable-kvm is set\n", rc);
        goto fail_guest_notifiers;
    }

    aio_context_acquire(s->ctx);
    rc = virtio_scsi_vring_init(s, vs->ctrl_vq, 0);
    if (rc) {
        goto fail_vrings;
    }
    rc = virtio_scsi_vring_init(s, vs->event_vq, 1);
    if (rc) {
        goto fail_vrings;
    }
    for (i = 0; i < vs->conf.num_queues; i++) {
        rc = virtio_scsi_vring_init(s, vs->cmd_vqs[i], i + 2);
        if (rc) {
            goto fail_vrings;
        }
    }

    s->dataplane_starting = false;
    s->dataplane_started = true;
    aio_context_release(s->ctx);
    return;

fail_vrings:
    virtio_scsi_clear_aio(s);
    aio_context_release(s->ctx);
    for (i = 0; i < vs->conf.num_queues + 2; i++) {
        k->set_host_notifier(qbus->parent, i, false);
    }
    k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, false);
fail_guest_notifiers:
    s->dataplane_fenced = true;
    s->dataplane_starting = false;
    s->dataplane_started = true;
}

static void vhost_vsock_start(VirtIODevice *vdev)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    int ret;
    int i;

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        return;
    }

    ret = vhost_dev_enable_notifiers(&vsock->vhost_dev, vdev);
    if (ret < 0) {
        error_report("Error enabling host notifiers: %d", -ret);
        return;
    }

    ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, true);
    if (ret < 0) {
        error_report("Error binding guest notifier: %d", -ret);
        goto err_host_notifiers;
    }

    vsock->vhost_dev.acked_features = vdev->guest_features;
    ret = vhost_dev_start(&vsock->vhost_dev, vdev);
    if (ret < 0) {
        error_report("Error starting vhost: %d", -ret);
        goto err_guest_notifiers;
    }

    ret = vhost_vsock_set_running(vsock, 1);
    if (ret < 0) {
        error_report("Error starting vhost vsock: %d", -ret);
        goto err_dev_start;
    }

    /* guest_notifier_mask/pending not used yet, so just unmask
     * everything here.  virtio-pci will do the right thing by
     * enabling/disabling irqfd.
     */
    for (i = 0; i < vsock->vhost_dev.nvqs; i++) {
        vhost_virtqueue_mask(&vsock->vhost_dev, vdev, i, false);
    }

    return;

err_dev_start:
    vhost_dev_stop(&vsock->vhost_dev, vdev);
err_guest_notifiers:
    k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
err_host_notifiers:
    vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
}

static void vhost_net_stop_one(struct vhost_net *net,
                               VirtIODevice *dev)
{
    struct vhost_vring_file file = { .fd = -1 };

    if (!net->dev.started) {
        return;
    }

    for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
        int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
        assert(r >= 0);
    }
    net->nc->info->poll(net->nc, true);
    vhost_dev_stop(&net->dev, dev);
    vhost_dev_disable_notifiers(&net->dev, dev);
}

int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
                    int total_queues)
{
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
    VirtioBusState *vbus = VIRTIO_BUS(qbus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
    int r, i = 0;

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        r = -ENOSYS;
        goto err;
    }

    for (i = 0; i < total_queues; i++) {
        r = vhost_net_start_one(tap_get_vhost_net(ncs[i].peer), dev, i * 2);

        if (r < 0) {
            goto err;
        }
    }

    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
    if (r < 0) {
        error_report("Error binding guest notifier: %d", -r);
        goto err;
    }

    return 0;

err:
    while (--i >= 0) {
        vhost_net_stop_one(tap_get_vhost_net(ncs[i].peer), dev);
    }
    return r;
}

DeviceState *aux_create_slave(AUXBus *bus, const char *type, uint32_t addr)
{
    DeviceState *dev;

    dev = DEVICE(object_new(type));
    assert(dev);
    qdev_set_parent_bus(dev, &bus->qbus);
    qdev_init_nofail(dev);
    aux_bus_map_device(AUX_BUS(qdev_get_parent_bus(dev)), AUX_SLAVE(dev), addr);
    return dev;
}

static void adb_device_realizefn(DeviceState *dev, Error **errp)
{
    ADBDevice *d = ADB_DEVICE(dev);
    ADBBusState *bus = ADB_BUS(qdev_get_parent_bus(dev));

    if (bus->nb_devices >= MAX_ADB_DEVICES) {
        return;
    }

    bus->devices[bus->nb_devices++] = d;
}