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/*
* SCLP event type
* Signal Quiesce - trigger system powerdown request
*
* 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 "qemu/osdep.h"
#include "hw/qdev.h"
#include "sysemu/sysemu.h"
#include "hw/s390x/sclp.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "hw/s390x/event-facility.h"
typedef struct SignalQuiesce {
EventBufferHeader ebh;
uint16_t timeout;
uint8_t unit;
} QEMU_PACKED SignalQuiesce;
static bool can_handle_event(uint8_t type)
{
return type == SCLP_EVENT_SIGNAL_QUIESCE;
}
static sccb_mask_t send_mask(void)
{
return SCLP_EVENT_MASK_SIGNAL_QUIESCE;
}
static sccb_mask_t receive_mask(void)
{
return 0;
}
static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
int *slen)
{
SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr;
if (*slen < sizeof(SignalQuiesce)) {
return 0;
}
if (!event->event_pending) {
return 0;
}
event->event_pending = false;
sq->ebh.length = cpu_to_be16(sizeof(SignalQuiesce));
sq->ebh.type = SCLP_EVENT_SIGNAL_QUIESCE;
sq->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
/*
* system_powerdown does not have a timeout. Fortunately the
* timeout value is currently ignored by Linux, anyway
*/
sq->timeout = cpu_to_be16(0);
sq->unit = cpu_to_be16(0);
*slen -= sizeof(SignalQuiesce);
return 1;
}
static const VMStateDescription vmstate_sclpquiesce = {
.name = TYPE_SCLP_QUIESCE,
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_BOOL(event_pending, SCLPEvent),
VMSTATE_END_OF_LIST()
}
};
typedef struct QuiesceNotifier QuiesceNotifier;
static struct QuiesceNotifier {
Notifier notifier;
SCLPEvent *event;
} qn;
static void quiesce_powerdown_req(Notifier *n, void *opaque)
{
QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier);
SCLPEvent *event = qn->event;
event->event_pending = true;
/* trigger SCLP read operation */
sclp_service_interrupt(0);
}
static int quiesce_init(SCLPEvent *event)
{
qn.notifier.notify = quiesce_powerdown_req;
qn.event = event;
qemu_register_powerdown_notifier(&qn.notifier);
return 0;
}
static void quiesce_reset(DeviceState *dev)
{
SCLPEvent *event = SCLP_EVENT(dev);
event->event_pending = false;
}
static void quiesce_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
dc->reset = quiesce_reset;
dc->vmsd = &vmstate_sclpquiesce;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
/*
* Reason: This is just an internal device - the notifier should
* not be registered multiple times in quiesce_init()
*/
dc->user_creatable = false;
k->init = quiesce_init;
k->get_send_mask = send_mask;
k->get_receive_mask = receive_mask;
k->can_handle_event = can_handle_event;
k->read_event_data = read_event_data;
k->write_event_data = NULL;
}
static const TypeInfo sclp_quiesce_info = {
.name = TYPE_SCLP_QUIESCE,
.parent = TYPE_SCLP_EVENT,
.instance_size = sizeof(SCLPEvent),
.class_init = quiesce_class_init,
.class_size = sizeof(SCLPEventClass),
};
static void register_types(void)
{
type_register_static(&sclp_quiesce_info);
}
type_init(register_types)
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