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
  11 #include "qemu/osdep.h"
  12 #include "qapi/error.h"
  13 #include "hw/sysbus.h"
  14 #include "qemu/bitops.h"
  15 #include "qemu/module.h"
  16 #include "hw/s390x/ap-bridge.h"
  17 #include "cpu.h"
  18
  19 static char *ap_bus_get_dev_path(DeviceState *dev)
  20 {
  21     /* at most one */
  22     return g_strdup_printf("/1");
  23 }
  24
  25 static void ap_bus_class_init(ObjectClass *oc, void *data)
  26 {
  27     BusClass *k = BUS_CLASS(oc);
  28
  29     k->get_dev_path = ap_bus_get_dev_path;
  30     /* More than one ap device does not make sense */
  31     k->max_dev = 1;
  32 }
  33
  34 static const TypeInfo ap_bus_info = {
  35     .name = TYPE_AP_BUS,
  36     .parent = TYPE_BUS,
  37     .instance_size = 0,
  38     .class_init = ap_bus_class_init,
  39 };
  40
  41 void s390_init_ap(void)
  42 {
  43     DeviceState *dev;
  44     BusState *bus;
  45
  46     /* If no AP instructions then no need for AP bridge */
  47     if (!s390_has_feat(S390_FEAT_AP)) {
  48         return;
  49     }
  50
  51     /* Create bridge device */
  52     dev = qdev_create(NULL, TYPE_AP_BRIDGE);
  53     object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
  54                               OBJECT(dev));
  55     qdev_init_nofail(dev);
  56
  57     /* Create bus on bridge device */
  58     bus = qbus_create(TYPE_AP_BUS, dev, TYPE_AP_BUS);
  59
  60     /* Enable hotplugging */
  61     qbus_set_hotplug_handler(bus, OBJECT(dev), &error_abort);
  62  }
  63
  64 static void ap_bridge_class_init(ObjectClass *oc, void *data)
  65 {
  66     DeviceClass *dc = DEVICE_CLASS(oc);
  67     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
  68
  69     hc->unplug = qdev_simple_device_unplug_cb;
  70     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
  71 }
  72
  73 static const TypeInfo ap_bridge_info = {
  74     .name          = TYPE_AP_BRIDGE,
  75     .parent        = TYPE_SYS_BUS_DEVICE,
  76     .instance_size = 0,
  77     .class_init    = ap_bridge_class_init,
  78     .interfaces = (InterfaceInfo[]) {
  79         { TYPE_HOTPLUG_HANDLER },
  80         { }
  81     }
  82 };
  83
  84 static void ap_register(void)
  85 {
  86     type_register_static(&ap_bridge_info);
  87     type_register_static(&ap_bus_info);
  88 }
  89
  90 type_init(ap_register)