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) |
151 | |