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 #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" 19 20 typedef struct SignalQuiesce { 21 EventBufferHeader ebh; 22 uint16_t timeout; 23 uint8_t unit; 24 } QEMU_PACKED SignalQuiesce; 25 26 static bool can_handle_event(uint8_t type) 27 { 28 return type == SCLP_EVENT_SIGNAL_QUIESCE; 29 } 30 31 static unsigned int send_mask(void) 32 { 33 return SCLP_EVENT_MASK_SIGNAL_QUIESCE; 34 } 35 36 static unsigned int receive_mask(void) 37 { 38 return 0; 39 } 40 41 static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr, 42 int *slen) 43 { 44 SignalQuiesce *sq = (SignalQuiesce *) evt_buf_hdr; 45 46 if (*slen < sizeof(SignalQuiesce)) { 47 return 0; 48 } 49 50 if (!event->event_pending) { 51 return 0; 52 } 53 event->event_pending = false; 54 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; 58 /* 59 * system_powerdown does not have a timeout. Fortunately the 60 * timeout value is currently ignored by Linux, anyway 61 */ 62 sq->timeout = cpu_to_be16(0); 63 sq->unit = cpu_to_be16(0); 64 *slen -= sizeof(SignalQuiesce); 65 66 return 1; 67 } 68 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() 76 } 77 }; 78 79 typedef struct QuiesceNotifier QuiesceNotifier; 80 81 static struct QuiesceNotifier { 82 Notifier notifier; 83 SCLPEvent *event; 84 } qn; 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 qn.notifier.notify = quiesce_powerdown_req; 99 qn.event = event; 100 101 qemu_register_powerdown_notifier(&qn.notifier); 102 103 return 0; 104 } 105 106 static void quiesce_reset(DeviceState *dev) 107 { 108 SCLPEvent *event = SCLP_EVENT(dev); 109 110 event->event_pending = false; 111 } 112 113 static void quiesce_class_init(ObjectClass *klass, void *data) 114 { 115 DeviceClass *dc = DEVICE_CLASS(klass); 116 SCLPEventClass *k = SCLP_EVENT_CLASS(klass); 117 118 dc->reset = quiesce_reset; 119 dc->vmsd = &vmstate_sclpquiesce; 120 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 121 /* 122 * Reason: This is just an internal device - the notifier should 123 * not be registered multiple times in quiesce_init() 124 */ 125 dc->user_creatable = false; 126 127 k->init = quiesce_init; 128 k->get_send_mask = send_mask; 129 k->get_receive_mask = receive_mask; 130 k->can_handle_event = can_handle_event; 131 k->read_event_data = read_event_data; 132 k->write_event_data = NULL; 133 } 134 135 static const TypeInfo sclp_quiesce_info = { 136 .name = TYPE_SCLP_QUIESCE, 137 .parent = TYPE_SCLP_EVENT, 138 .instance_size = sizeof(SCLPEvent), 139 .class_init = quiesce_class_init, 140 .class_size = sizeof(SCLPEventClass), 141 }; 142 143 static void register_types(void) 144 { 145 type_register_static(&sclp_quiesce_info); 146 } 147 148 type_init(register_types) 149