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sclpquiesce.c (3620B)

      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)