124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
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/*
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* SCLP event type
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* Signal Quiesce - trigger system powerdown request
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Heinz Graalfs <graalfs@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include <hw/qdev.h>
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#include "sysemu.h"
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#include "sclp.h"
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#include "event-facility.h"
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typedef struct SignalQuiesce {
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EventBufferHeader ebh;
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uint16_t timeout;
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uint8_t unit;
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} QEMU_PACKED SignalQuiesce;
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static int event_type(void)
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{
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return SCLP_EVENT_SIGNAL_QUIESCE;
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}
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static unsigned int send_mask(void)
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{
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return SCLP_EVENT_MASK_SIGNAL_QUIESCE;
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}
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static unsigned int receive_mask(void)
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{
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return 0;
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}
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static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
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int *slen)
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{
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SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr;
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if (*slen < sizeof(SignalQuiesce)) {
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return 0;
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}
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if (!event->event_pending) {
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return 0;
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}
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event->event_pending = false;
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sq->ebh.length = cpu_to_be16(sizeof(SignalQuiesce));
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sq->ebh.type = SCLP_EVENT_SIGNAL_QUIESCE;
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sq->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
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/*
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* system_powerdown does not have a timeout. Fortunately the
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* timeout value is currently ignored by Linux, anyway
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*/
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sq->timeout = cpu_to_be16(0);
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sq->unit = cpu_to_be16(0);
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*slen -= sizeof(SignalQuiesce);
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return 1;
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}
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typedef struct QuiesceNotifier QuiesceNotifier;
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static struct QuiesceNotifier {
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Notifier notifier;
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SCLPEvent *event;
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} qn;
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static void quiesce_powerdown_req(Notifier *n, void *opaque)
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{
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QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier);
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SCLPEvent *event = qn->event;
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event->event_pending = true;
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/* trigger SCLP read operation */
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sclp_service_interrupt(0);
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}
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static int quiesce_init(SCLPEvent *event)
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{
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event->event_type = SCLP_EVENT_SIGNAL_QUIESCE;
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qn.notifier.notify = quiesce_powerdown_req;
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qn.event = event;
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qemu_register_powerdown_notifier(&qn.notifier);
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return 0;
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}
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static void quiesce_class_init(ObjectClass *klass, void *data)
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{
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SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
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k->init = quiesce_init;
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k->get_send_mask = send_mask;
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k->get_receive_mask = receive_mask;
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k->event_type = event_type;
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k->read_event_data = read_event_data;
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k->write_event_data = NULL;
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}
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static TypeInfo sclp_quiesce_info = {
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.name = "sclpquiesce",
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.parent = TYPE_SCLP_EVENT,
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.instance_size = sizeof(SCLPEvent),
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.class_init = quiesce_class_init,
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.class_size = sizeof(SCLPEventClass),
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};
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static void register_types(void)
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{
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type_register_static(&sclp_quiesce_info);
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}
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type_init(register_types)
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