Merge remote-tracking branch 'remotes/mjt/tags/trivial-patches-fetch' into staging
[qemu/ar7.git] / hw / s390x / sclpquiesce.c
blob762cb184acb949c21386bad6f3dbb498044be8c3
1 /*
2 * SCLP event type
3 * Signal Quiesce - trigger system powerdown request
5 * Copyright IBM, Corp. 2012
7 * Authors:
8 * Heinz Graalfs <graalfs@de.ibm.com>
10 * This work is licensed under the terms of the GNU GPL, version 2 or (at your
11 * option) any later version. See the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include "hw/qdev.h"
16 #include "sysemu/sysemu.h"
17 #include "hw/s390x/sclp.h"
18 #include "hw/s390x/event-facility.h"
20 typedef struct SignalQuiesce {
21 EventBufferHeader ebh;
22 uint16_t timeout;
23 uint8_t unit;
24 } QEMU_PACKED SignalQuiesce;
26 static bool can_handle_event(uint8_t type)
28 return type == SCLP_EVENT_SIGNAL_QUIESCE;
31 static unsigned int send_mask(void)
33 return SCLP_EVENT_MASK_SIGNAL_QUIESCE;
36 static unsigned int receive_mask(void)
38 return 0;
41 static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
42 int *slen)
44 SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr;
46 if (*slen < sizeof(SignalQuiesce)) {
47 return 0;
50 if (!event->event_pending) {
51 return 0;
53 event->event_pending = false;
55 sq->ebh.length = cpu_to_be16(sizeof(SignalQuiesce));
56 sq->ebh.type = SCLP_EVENT_SIGNAL_QUIESCE;
57 sq->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
59 * system_powerdown does not have a timeout. Fortunately the
60 * timeout value is currently ignored by Linux, anyway
62 sq->timeout = cpu_to_be16(0);
63 sq->unit = cpu_to_be16(0);
64 *slen -= sizeof(SignalQuiesce);
66 return 1;
69 static const VMStateDescription vmstate_sclpquiesce = {
70 .name = TYPE_SCLP_QUIESCE,
71 .version_id = 0,
72 .minimum_version_id = 0,
73 .fields = (VMStateField[]) {
74 VMSTATE_BOOL(event_pending, SCLPEvent),
75 VMSTATE_END_OF_LIST()
79 typedef struct QuiesceNotifier QuiesceNotifier;
81 static struct QuiesceNotifier {
82 Notifier notifier;
83 SCLPEvent *event;
84 } qn;
86 static void quiesce_powerdown_req(Notifier *n, void *opaque)
88 QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier);
89 SCLPEvent *event = qn->event;
91 event->event_pending = true;
92 /* trigger SCLP read operation */
93 sclp_service_interrupt(0);
96 static int quiesce_init(SCLPEvent *event)
98 qn.notifier.notify = quiesce_powerdown_req;
99 qn.event = event;
101 qemu_register_powerdown_notifier(&qn.notifier);
103 return 0;
106 static void quiesce_reset(DeviceState *dev)
108 SCLPEvent *event = SCLP_EVENT(dev);
110 event->event_pending = false;
113 static void quiesce_class_init(ObjectClass *klass, void *data)
115 DeviceClass *dc = DEVICE_CLASS(klass);
116 SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
118 dc->reset = quiesce_reset;
119 dc->vmsd = &vmstate_sclpquiesce;
120 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
121 k->init = quiesce_init;
123 k->get_send_mask = send_mask;
124 k->get_receive_mask = receive_mask;
125 k->can_handle_event = can_handle_event;
126 k->read_event_data = read_event_data;
127 k->write_event_data = NULL;
130 static const TypeInfo sclp_quiesce_info = {
131 .name = TYPE_SCLP_QUIESCE,
132 .parent = TYPE_SCLP_EVENT,
133 .instance_size = sizeof(SCLPEvent),
134 .class_init = quiesce_class_init,
135 .class_size = sizeof(SCLPEventClass),
138 static void register_types(void)
140 type_register_static(&sclp_quiesce_info);
143 type_init(register_types)