hw/s390x/event-facility.c - third_party/qemu - Git at Google

 /*
  * SCLP
  *    Event Facility
  *       handles SCLP event types
  *          - Signal Quiesce - system power down
  *          - ASCII Console Data - VT220 read and write
  *
  * Copyright IBM, Corp. 2012
  *
  * Authors:
  *  Heinz Graalfs <graalfs@de.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  * option) any later version.  See the COPYING file in the top-level directory.
  *
  */

 #include "monitor.h"
 #include "sysemu.h"

 #include "sclp.h"
 #include "event-facility.h"

 typedef struct EventTypesBus {
     BusState qbus;
 } EventTypesBus;

 struct SCLPEventFacility {
     EventTypesBus sbus;
     DeviceState *qdev;
     /* guest' receive mask */
     unsigned int receive_mask;
 };

 /* return true if any child has event pending set */
 static bool event_pending(SCLPEventFacility *ef)
 {
     BusChild *kid;
     SCLPEvent *event;
     SCLPEventClass *event_class;

     QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
         DeviceState *qdev = kid->child;
         event = DO_UPCAST(SCLPEvent, qdev, qdev);
         event_class = SCLP_EVENT_GET_CLASS(event);
         if (event->event_pending &&
             event_class->get_send_mask() & ef->receive_mask) {
             return true;
         }
     }
     return false;
 }

 static unsigned int get_host_send_mask(SCLPEventFacility *ef)
 {
     unsigned int mask;
     BusChild *kid;
     SCLPEventClass *child;

     mask = 0;

     QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
         DeviceState *qdev = kid->child;
         child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
         mask |= child->get_send_mask();
     }
     return mask;
 }

 static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
 {
     unsigned int mask;
     BusChild *kid;
     SCLPEventClass *child;

     mask = 0;

     QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
         DeviceState *qdev = kid->child;
         child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
         mask |= child->get_receive_mask();
     }
     return mask;
 }

 static uint16_t write_event_length_check(SCCB *sccb)
 {
     int slen;
     unsigned elen = 0;
     EventBufferHeader *event;
     WriteEventData *wed = (WriteEventData *) sccb;

     event = (EventBufferHeader *) &wed->ebh;
     for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
         elen = be16_to_cpu(event->length);
         if (elen < sizeof(*event) || elen > slen) {
             return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
         }
         event = (void *) event + elen;
     }
     if (slen) {
         return SCLP_RC_INCONSISTENT_LENGTHS;
     }
     return SCLP_RC_NORMAL_COMPLETION;
 }

 static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
                                        EventBufferHeader *event_buf, SCCB *sccb)
 {
     uint16_t rc;
     BusChild *kid;
     SCLPEvent *event;
     SCLPEventClass *ec;

     rc = SCLP_RC_INVALID_FUNCTION;

     QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
         DeviceState *qdev = kid->child;
         event = (SCLPEvent *) qdev;
         ec = SCLP_EVENT_GET_CLASS(event);

         if (ec->write_event_data &&
             ec->event_type() == event_buf->type) {
             rc = ec->write_event_data(event, event_buf);
             break;
         }
     }
     return rc;
 }

 static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
 {
     uint16_t rc;
     int slen;
     unsigned elen = 0;
     EventBufferHeader *event_buf;
     WriteEventData *wed = (WriteEventData *) sccb;

     event_buf = &wed->ebh;
     rc = SCLP_RC_NORMAL_COMPLETION;

     /* loop over all contained event buffers */
     for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
         elen = be16_to_cpu(event_buf->length);

         /* in case of a previous error mark all trailing buffers
          * as not accepted */
         if (rc != SCLP_RC_NORMAL_COMPLETION) {
             event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
         } else {
             rc = handle_write_event_buf(ef, event_buf, sccb);
         }
         event_buf = (void *) event_buf + elen;
     }
     return rc;
 }

 static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
 {
     if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
         goto out;
     }
     if (be16_to_cpu(sccb->h.length) < 8) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
         goto out;
     }
     /* first do a sanity check of the write events */
     sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));

     /* if no early error, then execute */
     if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
         sccb->h.response_code =
                 cpu_to_be16(handle_sccb_write_events(ef, sccb));
     }

 out:
     return;
 }

 static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
                                         unsigned int mask)
 {
     uint16_t rc;
     int slen;
     unsigned elen = 0;
     BusChild *kid;
     SCLPEvent *event;
     SCLPEventClass *ec;
     EventBufferHeader *event_buf;
     ReadEventData *red = (ReadEventData *) sccb;

     event_buf = &red->ebh;
     event_buf->length = 0;
     slen = sizeof(sccb->data);

     rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;

     QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
         DeviceState *qdev = kid->child;
         event = (SCLPEvent *) qdev;
         ec = SCLP_EVENT_GET_CLASS(event);

         if (mask & ec->get_send_mask()) {
             if (ec->read_event_data(event, event_buf, &slen)) {
                 rc = SCLP_RC_NORMAL_COMPLETION;
             }
         }
         elen = be16_to_cpu(event_buf->length);
         event_buf = (void *) event_buf + elen;
     }

     if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
         /* architecture suggests to reset variable-length-response bit */
         sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
         /* with a new length value */
         sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
     }
     return rc;
 }

 static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
 {
     unsigned int sclp_active_selection_mask;
     unsigned int sclp_cp_receive_mask;

     ReadEventData *red = (ReadEventData *) sccb;

     if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
         goto out;
     }

     sclp_cp_receive_mask = ef->receive_mask;

     /* get active selection mask */
     switch (sccb->h.function_code) {
     case SCLP_UNCONDITIONAL_READ:
         sclp_active_selection_mask = sclp_cp_receive_mask;
         break;
     case SCLP_SELECTIVE_READ:
         if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
             sccb->h.response_code =
                     cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
             goto out;
         }
         sclp_active_selection_mask = be32_to_cpu(red->mask);
         break;
     default:
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
         goto out;
     }
     sccb->h.response_code = cpu_to_be16(
             handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));

 out:
     return;
 }

 static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
 {
     WriteEventMask *we_mask = (WriteEventMask *) sccb;

     /* Attention: We assume that Linux uses 4-byte masks, what it actually
        does. Architecture allows for masks of variable size, though */
     if (be16_to_cpu(we_mask->mask_length) != 4) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
         goto out;
     }

     /* keep track of the guest's capability masks */
     ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);

     /* return the SCLP's capability masks to the guest */
     we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
     we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));

     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);

 out:
     return;
 }

 /* qemu object creation and initialization functions */

 #define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"

 static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
 {
 }

 static const TypeInfo s390_sclp_events_bus_info = {
     .name = TYPE_SCLP_EVENTS_BUS,
     .parent = TYPE_BUS,
     .class_init = sclp_events_bus_class_init,
 };

 static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
 {
     switch (code) {
     case SCLP_CMD_READ_EVENT_DATA:
         read_event_data(ef, sccb);
         break;
     case SCLP_CMD_WRITE_EVENT_DATA:
         write_event_data(ef, sccb);
         break;
     case SCLP_CMD_WRITE_EVENT_MASK:
         write_event_mask(ef, sccb);
         break;
     default:
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
         break;
     }
 }

 static int init_event_facility(S390SCLPDevice *sdev)
 {
     SCLPEventFacility *event_facility;
     DeviceState *quiesce;

     event_facility = g_malloc0(sizeof(SCLPEventFacility));
     sdev->ef = event_facility;
     sdev->sclp_command_handler = command_handler;
     sdev->event_pending = event_pending;

     /* Spawn a new sclp-events facility */
     qbus_create_inplace(&event_facility->sbus.qbus,
                         TYPE_SCLP_EVENTS_BUS, (DeviceState *)sdev, NULL);
     event_facility->sbus.qbus.allow_hotplug = 0;
     event_facility->qdev = (DeviceState *) sdev;

     quiesce = qdev_create(&event_facility->sbus.qbus, "sclpquiesce");
     if (!quiesce) {
         return -1;
     }
     qdev_init_nofail(quiesce);

     return 0;
 }

 static void init_event_facility_class(ObjectClass *klass, void *data)
 {
     S390SCLPDeviceClass *k = SCLP_S390_DEVICE_CLASS(klass);

     k->init = init_event_facility;
 }

 static TypeInfo s390_sclp_event_facility_info = {
     .name          = "s390-sclp-event-facility",
     .parent        = TYPE_DEVICE_S390_SCLP,
     .instance_size = sizeof(S390SCLPDevice),
     .class_init    = init_event_facility_class,
 };

 static int event_qdev_init(DeviceState *qdev)
 {
     SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
     SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);

     return child->init(event);
 }

 static int event_qdev_exit(DeviceState *qdev)
 {
     SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
     SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
     if (child->exit) {
         child->exit(event);
     }
     return 0;
 }

 static void event_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->bus_type = TYPE_SCLP_EVENTS_BUS;
     dc->unplug = qdev_simple_unplug_cb;
     dc->init = event_qdev_init;
     dc->exit = event_qdev_exit;
 }

 static TypeInfo s390_sclp_event_type_info = {
     .name = TYPE_SCLP_EVENT,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(SCLPEvent),
     .class_init = event_class_init,
     .class_size = sizeof(SCLPEventClass),
     .abstract = true,
 };

 static void register_types(void)
 {
     type_register_static(&s390_sclp_events_bus_info);
     type_register_static(&s390_sclp_event_facility_info);
     type_register_static(&s390_sclp_event_type_info);
 }

 type_init(register_types)
	/*
	* SCLP
	* Event Facility
	* handles SCLP event types
	* - Signal Quiesce - system power down
	* - ASCII Console Data - VT220 read and write
	*
	* Copyright IBM, Corp. 2012
	*
	* Authors:
	* Heinz Graalfs <graalfs@de.ibm.com>
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or (at your
	* option) any later version. See the COPYING file in the top-level directory.
	*
	*/

	#include "monitor.h"
	#include "sysemu.h"

	#include "sclp.h"
	#include "event-facility.h"

	typedef struct EventTypesBus {
	BusState qbus;
	} EventTypesBus;

	struct SCLPEventFacility {
	EventTypesBus sbus;
	DeviceState *qdev;
	/* guest' receive mask */
	unsigned int receive_mask;
	};

	/* return true if any child has event pending set */
	static bool event_pending(SCLPEventFacility *ef)
	{
	BusChild *kid;
	SCLPEvent *event;
	SCLPEventClass *event_class;

	QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
	DeviceState *qdev = kid->child;
	event = DO_UPCAST(SCLPEvent, qdev, qdev);
	event_class = SCLP_EVENT_GET_CLASS(event);
	if (event->event_pending &&
	event_class->get_send_mask() & ef->receive_mask) {
	return true;
	}
	}
	return false;
	}

	static unsigned int get_host_send_mask(SCLPEventFacility *ef)
	{
	unsigned int mask;
	BusChild *kid;
	SCLPEventClass *child;

	mask = 0;

	QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
	DeviceState *qdev = kid->child;
	child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
	mask \|= child->get_send_mask();
	}
	return mask;
	}

	static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
	{
	unsigned int mask;
	BusChild *kid;
	SCLPEventClass *child;

	mask = 0;

	QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
	DeviceState *qdev = kid->child;
	child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
	mask \|= child->get_receive_mask();
	}
	return mask;
	}

	static uint16_t write_event_length_check(SCCB *sccb)
	{
	int slen;
	unsigned elen = 0;
	EventBufferHeader *event;
	WriteEventData wed = (WriteEventData ) sccb;

	event = (EventBufferHeader *) &wed->ebh;
	for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
	elen = be16_to_cpu(event->length);
	if (elen < sizeof(*event) \|\| elen > slen) {
	return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
	}
	event = (void *) event + elen;
	}
	if (slen) {
	return SCLP_RC_INCONSISTENT_LENGTHS;
	}
	return SCLP_RC_NORMAL_COMPLETION;
	}

	static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
	EventBufferHeader event_buf, SCCB sccb)
	{
	uint16_t rc;
	BusChild *kid;
	SCLPEvent *event;
	SCLPEventClass *ec;

	rc = SCLP_RC_INVALID_FUNCTION;

	QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
	DeviceState *qdev = kid->child;
	event = (SCLPEvent *) qdev;
	ec = SCLP_EVENT_GET_CLASS(event);

	if (ec->write_event_data &&
	ec->event_type() == event_buf->type) {
	rc = ec->write_event_data(event, event_buf);
	break;
	}
	}
	return rc;
	}

	static uint16_t handle_sccb_write_events(SCLPEventFacility ef, SCCB sccb)
	{
	uint16_t rc;
	int slen;
	unsigned elen = 0;
	EventBufferHeader *event_buf;
	WriteEventData wed = (WriteEventData ) sccb;

	event_buf = &wed->ebh;
	rc = SCLP_RC_NORMAL_COMPLETION;

	/* loop over all contained event buffers */
	for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
	elen = be16_to_cpu(event_buf->length);

	/* in case of a previous error mark all trailing buffers
	* as not accepted */
	if (rc != SCLP_RC_NORMAL_COMPLETION) {
	event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
	} else {
	rc = handle_write_event_buf(ef, event_buf, sccb);
	}
	event_buf = (void *) event_buf + elen;
	}
	return rc;
	}

	static void write_event_data(SCLPEventFacility ef, SCCB sccb)
	{
	if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
	goto out;
	}
	if (be16_to_cpu(sccb->h.length) < 8) {
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
	goto out;
	}
	/* first do a sanity check of the write events */
	sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));

	/* if no early error, then execute */
	if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
	sccb->h.response_code =
	cpu_to_be16(handle_sccb_write_events(ef, sccb));
	}

	out:
	return;
	}

	static uint16_t handle_sccb_read_events(SCLPEventFacility ef, SCCB sccb,
	unsigned int mask)
	{
	uint16_t rc;
	int slen;
	unsigned elen = 0;
	BusChild *kid;
	SCLPEvent *event;
	SCLPEventClass *ec;
	EventBufferHeader *event_buf;
	ReadEventData red = (ReadEventData ) sccb;

	event_buf = &red->ebh;
	event_buf->length = 0;
	slen = sizeof(sccb->data);

	rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;

	QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
	DeviceState *qdev = kid->child;
	event = (SCLPEvent *) qdev;
	ec = SCLP_EVENT_GET_CLASS(event);

	if (mask & ec->get_send_mask()) {
	if (ec->read_event_data(event, event_buf, &slen)) {
	rc = SCLP_RC_NORMAL_COMPLETION;
	}
	}
	elen = be16_to_cpu(event_buf->length);
	event_buf = (void *) event_buf + elen;
	}

	if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
	/* architecture suggests to reset variable-length-response bit */
	sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
	/* with a new length value */
	sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
	}
	return rc;
	}

	static void read_event_data(SCLPEventFacility ef, SCCB sccb)
	{
	unsigned int sclp_active_selection_mask;
	unsigned int sclp_cp_receive_mask;

	ReadEventData red = (ReadEventData ) sccb;

	if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
	goto out;
	}

	sclp_cp_receive_mask = ef->receive_mask;

	/* get active selection mask */
	switch (sccb->h.function_code) {
	case SCLP_UNCONDITIONAL_READ:
	sclp_active_selection_mask = sclp_cp_receive_mask;
	break;
	case SCLP_SELECTIVE_READ:
	if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
	sccb->h.response_code =
	cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
	goto out;
	}
	sclp_active_selection_mask = be32_to_cpu(red->mask);
	break;
	default:
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
	goto out;
	}
	sccb->h.response_code = cpu_to_be16(
	handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));

	out:
	return;
	}

	static void write_event_mask(SCLPEventFacility ef, SCCB sccb)
	{
	WriteEventMask we_mask = (WriteEventMask ) sccb;

	/* Attention: We assume that Linux uses 4-byte masks, what it actually
	does. Architecture allows for masks of variable size, though */
	if (be16_to_cpu(we_mask->mask_length) != 4) {
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
	goto out;
	}

	/* keep track of the guest's capability masks */
	ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);

	/* return the SCLP's capability masks to the guest */
	we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
	we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));

	sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);

	out:
	return;
	}

	/* qemu object creation and initialization functions */

	#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"

	static void sclp_events_bus_class_init(ObjectClass klass, void data)
	{
	}

	static const TypeInfo s390_sclp_events_bus_info = {
	.name = TYPE_SCLP_EVENTS_BUS,
	.parent = TYPE_BUS,
	.class_init = sclp_events_bus_class_init,
	};

	static void command_handler(SCLPEventFacility ef, SCCB sccb, uint64_t code)
	{
	switch (code) {
	case SCLP_CMD_READ_EVENT_DATA:
	read_event_data(ef, sccb);
	break;
	case SCLP_CMD_WRITE_EVENT_DATA:
	write_event_data(ef, sccb);
	break;
	case SCLP_CMD_WRITE_EVENT_MASK:
	write_event_mask(ef, sccb);
	break;
	default:
	sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
	break;
	}
	}

	static int init_event_facility(S390SCLPDevice *sdev)
	{
	SCLPEventFacility *event_facility;
	DeviceState *quiesce;

	event_facility = g_malloc0(sizeof(SCLPEventFacility));
	sdev->ef = event_facility;
	sdev->sclp_command_handler = command_handler;
	sdev->event_pending = event_pending;

	/* Spawn a new sclp-events facility */
	qbus_create_inplace(&event_facility->sbus.qbus,
	TYPE_SCLP_EVENTS_BUS, (DeviceState *)sdev, NULL);
	event_facility->sbus.qbus.allow_hotplug = 0;
	event_facility->qdev = (DeviceState *) sdev;

	quiesce = qdev_create(&event_facility->sbus.qbus, "sclpquiesce");
	if (!quiesce) {
	return -1;
	}
	qdev_init_nofail(quiesce);

	return 0;
	}

	static void init_event_facility_class(ObjectClass klass, void data)
	{
	S390SCLPDeviceClass *k = SCLP_S390_DEVICE_CLASS(klass);

	k->init = init_event_facility;
	}

	static TypeInfo s390_sclp_event_facility_info = {
	.name = "s390-sclp-event-facility",
	.parent = TYPE_DEVICE_S390_SCLP,
	.instance_size = sizeof(S390SCLPDevice),
	.class_init = init_event_facility_class,
	};

	static int event_qdev_init(DeviceState *qdev)
	{
	SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
	SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);

	return child->init(event);
	}

	static int event_qdev_exit(DeviceState *qdev)
	{
	SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
	SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
	if (child->exit) {
	child->exit(event);
	}
	return 0;
	}

	static void event_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->bus_type = TYPE_SCLP_EVENTS_BUS;
	dc->unplug = qdev_simple_unplug_cb;
	dc->init = event_qdev_init;
	dc->exit = event_qdev_exit;
	}

	static TypeInfo s390_sclp_event_type_info = {
	.name = TYPE_SCLP_EVENT,
	.parent = TYPE_DEVICE,
	.instance_size = sizeof(SCLPEvent),
	.class_init = event_class_init,
	.class_size = sizeof(SCLPEventClass),
	.abstract = true,
	};

	static void register_types(void)
	{
	type_register_static(&s390_sclp_events_bus_info);
	type_register_static(&s390_sclp_event_facility_info);
	type_register_static(&s390_sclp_event_type_info);
	}

	type_init(register_types)