| 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 "system/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 = (const VMStateField[]) { |
| 76 | VMSTATE_BOOL(event_pending, SCLPEvent), |
| 77 | VMSTATE_END_OF_LIST() |
| 78 | } |
| 79 | }; |
| 80 | |
| 81 | typedef struct QuiesceNotifier { |
| 82 | Notifier notifier; |
| 83 | SCLPEvent *event; |
| 84 | } QuiesceNotifier; |
| 85 | |
| 86 | static void quiesce_powerdown_req(Notifier *n, void *opaque) |
| 87 | { |
| 88 | QuiesceNotifier *qn = container_of(n, QuiesceNotifier, notifier); |
| 89 | SCLPEvent *event = qn->event; |
| 90 | |
| 91 | event->event_pending = true; |
| 92 | /* trigger SCLP read operation */ |
| 93 | sclp_service_interrupt(0); |
| 94 | } |
| 95 | |
| 96 | static int quiesce_init(SCLPEvent *event) |
| 97 | { |
| 98 | static QuiesceNotifier qn; |
| 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, const void *data) |
| 116 | { |
| 117 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 118 | SCLPEventClass *k = SCLP_EVENT_CLASS(klass); |
| 119 | |
| 120 | device_class_set_legacy_reset(dc, 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) |