hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[qemu.git] / hw / s390x / sclpquiesce.c
1 /*
2 * SCLP event type
3 * Signal Quiesce - trigger system powerdown request
4 *
5 * Copyright IBM, Corp. 2012
6 *
7 * Authors:
8 * Heinz Graalfs <graalfs@de.ibm.com>
9 *
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.
12 *
13 */
14
15 #include "qemu/osdep.h"
16 #include "hw/s390x/sclp.h"
17 #include "migration/vmstate.h"
18 #include "qemu/module.h"
19 #include "sysemu/runstate.h"
20 #include "hw/s390x/event-facility.h"
21
22 typedef struct SignalQuiesce {
23 EventBufferHeader ebh;
24 uint16_t timeout;
25 uint8_t unit;
26 } QEMU_PACKED SignalQuiesce;
27
28 static bool can_handle_event(uint8_t type)
29 {
30 return type == SCLP_EVENT_SIGNAL_QUIESCE;
31 }
32
33 static sccb_mask_t send_mask(void)
34 {
35 return SCLP_EVENT_MASK_SIGNAL_QUIESCE;
36 }
37
38 static sccb_mask_t receive_mask(void)
39 {
40 return 0;
41 }
42
43 static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
44 int *slen)
45 {
46 SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr;
47
48 if (*slen < sizeof(SignalQuiesce)) {
49 return 0;
50 }
51
52 if (!event->event_pending) {
53 return 0;
54 }
55 event->event_pending = false;
56
57 sq->ebh.length = cpu_to_be16(sizeof(SignalQuiesce));
58 sq->ebh.type = SCLP_EVENT_SIGNAL_QUIESCE;
59 sq->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
60 /*
61 * system_powerdown does not have a timeout. Fortunately the
62 * timeout value is currently ignored by Linux, anyway
63 */
64 sq->timeout = cpu_to_be16(0);
65 sq->unit = cpu_to_be16(0);
66 *slen -= sizeof(SignalQuiesce);
67
68 return 1;
69 }
70
71 static const VMStateDescription vmstate_sclpquiesce = {
72 .name = TYPE_SCLP_QUIESCE,
73 .version_id = 0,
74 .minimum_version_id = 0,
75 .fields = (VMStateField[]) {
76 VMSTATE_BOOL(event_pending, SCLPEvent),
77 VMSTATE_END_OF_LIST()
78 }
79 };
80
81 typedef struct QuiesceNotifier QuiesceNotifier;
82
83 static struct QuiesceNotifier {
84 Notifier notifier;
85 SCLPEvent *event;
86 } qn;
87
88 static void quiesce_powerdown_req(Notifier *n, void *opaque)
89 {
90 QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier);
91 SCLPEvent *event = qn->event;
92
93 event->event_pending = true;
94 /* trigger SCLP read operation */
95 sclp_service_interrupt(0);
96 }
97
98 static int quiesce_init(SCLPEvent *event)
99 {
100 qn.notifier.notify = quiesce_powerdown_req;
101 qn.event = event;
102
103 qemu_register_powerdown_notifier(&qn.notifier);
104
105 return 0;
106 }
107
108 static void quiesce_reset(DeviceState *dev)
109 {
110 SCLPEvent *event = SCLP_EVENT(dev);
111
112 event->event_pending = false;
113 }
114
115 static void quiesce_class_init(ObjectClass *klass, void *data)
116 {
117 DeviceClass *dc = DEVICE_CLASS(klass);
118 SCLPEventClass *k = SCLP_EVENT_CLASS(klass);
119
120 dc->reset = quiesce_reset;
121 dc->vmsd = &vmstate_sclpquiesce;
122 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
123 /*
124 * Reason: This is just an internal device - the notifier should
125 * not be registered multiple times in quiesce_init()
126 */
127 dc->user_creatable = false;
128
129 k->init = quiesce_init;
130 k->get_send_mask = send_mask;
131 k->get_receive_mask = receive_mask;
132 k->can_handle_event = can_handle_event;
133 k->read_event_data = read_event_data;
134 k->write_event_data = NULL;
135 }
136
137 static const TypeInfo sclp_quiesce_info = {
138 .name = TYPE_SCLP_QUIESCE,
139 .parent = TYPE_SCLP_EVENT,
140 .instance_size = sizeof(SCLPEvent),
141 .class_init = quiesce_class_init,
142 .class_size = sizeof(SCLPEventClass),
143 };
144
145 static void register_types(void)
146 {
147 type_register_static(&sclp_quiesce_info);
148 }
149
150 type_init(register_types)