b923ab3112
The "sclpquiesce" device is just an internal device that should not be created by the user directly. Though it currently does not seem to cause any obvious trouble when the user instantiates an additional device, let's better mark it with user_creatable = false to avoid unexpected behavior, e.g. because the quiesce notifier gets registered multiple times. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <1507193105-15627-1-git-send-email-thuth@redhat.com> Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/*
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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 "qemu/osdep.h"
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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 bool can_handle_event(uint8_t type)
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{
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return type == 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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static const VMStateDescription vmstate_sclpquiesce = {
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.name = TYPE_SCLP_QUIESCE,
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(event_pending, SCLPEvent),
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VMSTATE_END_OF_LIST()
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}
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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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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_reset(DeviceState *dev)
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{
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SCLPEvent *event = SCLP_EVENT(dev);
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event->event_pending = false;
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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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DeviceClass *dc = DEVICE_CLASS(klass);
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SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
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dc->reset = quiesce_reset;
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dc->vmsd = &vmstate_sclpquiesce;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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/*
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* Reason: This is just an internal device - the notifier should
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* not be registered multiple times in quiesce_init()
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*/
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dc->user_creatable = false;
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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->can_handle_event = can_handle_event;
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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 = TYPE_SCLP_QUIESCE,
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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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