qemu

FORK: QEMU emulator
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ap-bridge.c (2157B)

      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_new(TYPE_AP_BRIDGE);
     53     object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
     54                               OBJECT(dev));
     55     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     56 
     57     /* Create bus on bridge device */
     58     bus = qbus_new(TYPE_AP_BUS, dev, TYPE_AP_BUS);
     59 
     60     /* Enable hotplugging */
     61     qbus_set_hotplug_handler(bus, OBJECT(dev));
     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)