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) 89