1 /* 2 * css bridge implementation 3 * 4 * Copyright 2012,2016 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * Pierre Morel <pmorel@linux.vnet.ibm.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2 or (at 9 * your option) any later version. See the COPYING file in the top-level 10 * directory. 11 */ 12 #include "qemu/osdep.h" 13 #include "qapi/error.h" 14 #include "hw/hotplug.h" 15 #include "hw/sysbus.h" 16 #include "qemu/bitops.h" 17 #include "hw/s390x/css.h" 18 #include "ccw-device.h" 19 #include "hw/s390x/css-bridge.h" 20 21 /* 22 * Invoke device-specific unplug handler, disable the subchannel 23 * (including sending a channel report to the guest) and remove the 24 * device from the virtual css bus. 25 */ 26 static void ccw_device_unplug(HotplugHandler *hotplug_dev, 27 DeviceState *dev, Error **errp) 28 { 29 CcwDevice *ccw_dev = CCW_DEVICE(dev); 30 CCWDeviceClass *k = CCW_DEVICE_GET_CLASS(ccw_dev); 31 SubchDev *sch = ccw_dev->sch; 32 Error *err = NULL; 33 34 if (k->unplug) { 35 k->unplug(hotplug_dev, dev, &err); 36 if (err) { 37 error_propagate(errp, err); 38 return; 39 } 40 } 41 42 /* 43 * We should arrive here only for device_del, since we don't support 44 * direct hot(un)plug of channels. 45 */ 46 assert(sch != NULL); 47 /* Subchannel is now disabled and no longer valid. */ 48 sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA | 49 PMCW_FLAGS_MASK_DNV); 50 51 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0); 52 53 object_unparent(OBJECT(dev)); 54 } 55 56 static void virtual_css_bus_reset(BusState *qbus) 57 { 58 /* This should actually be modelled via the generic css */ 59 css_reset(); 60 } 61 62 static char *virtual_css_bus_get_dev_path(DeviceState *dev) 63 { 64 CcwDevice *ccw_dev = CCW_DEVICE(dev); 65 SubchDev *sch = ccw_dev->sch; 66 VirtualCssBridge *bridge = 67 VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent); 68 69 /* 70 * We can't provide a dev path for backward compatibility on 71 * older machines, as it is visible in the migration stream. 72 */ 73 return bridge->css_dev_path ? 74 g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) : 75 NULL; 76 } 77 78 static void virtual_css_bus_class_init(ObjectClass *klass, void *data) 79 { 80 BusClass *k = BUS_CLASS(klass); 81 82 k->reset = virtual_css_bus_reset; 83 k->get_dev_path = virtual_css_bus_get_dev_path; 84 } 85 86 static const TypeInfo virtual_css_bus_info = { 87 .name = TYPE_VIRTUAL_CSS_BUS, 88 .parent = TYPE_BUS, 89 .instance_size = sizeof(VirtualCssBus), 90 .class_init = virtual_css_bus_class_init, 91 }; 92 93 VirtualCssBus *virtual_css_bus_init(void) 94 { 95 VirtualCssBus *cbus; 96 BusState *bus; 97 DeviceState *dev; 98 99 /* Create bridge device */ 100 dev = qdev_create(NULL, TYPE_VIRTUAL_CSS_BRIDGE); 101 qdev_init_nofail(dev); 102 103 /* Create bus on bridge device */ 104 bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css"); 105 cbus = VIRTUAL_CSS_BUS(bus); 106 107 /* Enable hotplugging */ 108 qbus_set_hotplug_handler(bus, dev, &error_abort); 109 110 return cbus; 111 } 112 113 /***************** Virtual-css Bus Bridge Device ********************/ 114 115 static Property virtual_css_bridge_properties[] = { 116 DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path, 117 true), 118 DEFINE_PROP_END_OF_LIST(), 119 }; 120 121 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data) 122 { 123 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 124 DeviceClass *dc = DEVICE_CLASS(klass); 125 126 hc->unplug = ccw_device_unplug; 127 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 128 dc->props = virtual_css_bridge_properties; 129 } 130 131 static const TypeInfo virtual_css_bridge_info = { 132 .name = TYPE_VIRTUAL_CSS_BRIDGE, 133 .parent = TYPE_SYS_BUS_DEVICE, 134 .instance_size = sizeof(VirtualCssBridge), 135 .class_init = virtual_css_bridge_class_init, 136 .interfaces = (InterfaceInfo[]) { 137 { TYPE_HOTPLUG_HANDLER }, 138 { } 139 } 140 }; 141 142 static void virtual_css_register(void) 143 { 144 type_register_static(&virtual_css_bridge_info); 145 type_register_static(&virtual_css_bus_info); 146 } 147 148 type_init(virtual_css_register) 149