root / hw / s390x / sclpquiesce.c @ dcc6ceff
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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/sysemu.h" |
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#include "hw/s390x/sclp.h" |
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#include "hw/s390x/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 const 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) |