hw/s390x/ap-bridge.c

   1 /*
   2  * ap bridge
   3  *
   4  * Copyright 2018 IBM Corp.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   7  * your option) any later version. See the COPYING file in the top-level
   8  * directory.
   9  */
  10 #include "qemu/osdep.h"
  11 #include "qapi/error.h"
  12 #include "hw/sysbus.h"
  13 #include "qemu/bitops.h"
  14 #include "hw/s390x/ap-bridge.h"
  15 #include "cpu.h"
  16
  17 static char *ap_bus_get_dev_path(DeviceState *dev)
  18 {
  19     /* at most one */
  20     return g_strdup_printf("/1");
  21 }
  22
  23 static void ap_bus_class_init(ObjectClass *oc, void *data)
  24 {
  25     BusClass *k = BUS_CLASS(oc);
  26
  27     k->get_dev_path = ap_bus_get_dev_path;
  28     /* More than one ap device does not make sense */
  29     k->max_dev = 1;
  30 }
  31
  32 static const TypeInfo ap_bus_info = {
  33     .name = TYPE_AP_BUS,
  34     .parent = TYPE_BUS,
  35     .instance_size = 0,
  36     .class_init = ap_bus_class_init,
  37 };
  38
  39 void s390_init_ap(void)
  40 {
  41     DeviceState *dev;
  42     BusState *bus;
  43
  44     /* If no AP instructions then no need for AP bridge */
  45     if (!s390_has_feat(S390_FEAT_AP)) {
  46         return;
  47     }
  48
  49     /* Create bridge device */
  50     dev = qdev_create(NULL, TYPE_AP_BRIDGE);
  51     object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
  52                               OBJECT(dev), NULL);
  53     qdev_init_nofail(dev);
  54
  55     /* Create bus on bridge device */
  56     bus = qbus_create(TYPE_AP_BUS, dev, TYPE_AP_BUS);
  57
  58     /* Enable hotplugging */
  59     qbus_set_hotplug_handler(bus, OBJECT(dev), &error_abort);
  60  }
  61
  62 static void ap_bridge_class_init(ObjectClass *oc, void *data)
  63 {
  64     DeviceClass *dc = DEVICE_CLASS(oc);
  65     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
  66
  67     hc->unplug = qdev_simple_device_unplug_cb;
  68     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
  69 }
  70
  71 static const TypeInfo ap_bridge_info = {
  72     .name          = TYPE_AP_BRIDGE,
  73     .parent        = TYPE_SYS_BUS_DEVICE,
  74     .instance_size = 0,
  75     .class_init    = ap_bridge_class_init,
  76     .interfaces = (InterfaceInfo[]) {
  77         { TYPE_HOTPLUG_HANDLER },
  78         { }
  79     }
  80 };
  81
  82 static void ap_register(void)
  83 {
  84     type_register_static(&ap_bridge_info);
  85     type_register_static(&ap_bus_info);
  86 }
  87
  88 type_init(ap_register)