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 #include "cpu.h" 21 22 /* 23 * Invoke device-specific unplug handler, disable the subchannel 24 * (including sending a channel report to the guest) and remove the 25 * device from the virtual css bus. 26 */ 27 static void ccw_device_unplug(HotplugHandler *hotplug_dev, 28 DeviceState *dev, Error **errp) 29 { 30 CcwDevice *ccw_dev = CCW_DEVICE(dev); 31 CCWDeviceClass *k = CCW_DEVICE_GET_CLASS(ccw_dev); 32 SubchDev *sch = ccw_dev->sch; 33 Error *err = NULL; 34 35 if (k->unplug) { 36 k->unplug(hotplug_dev, dev, &err); 37 if (err) { 38 error_propagate(errp, err); 39 return; 40 } 41 } 42 43 /* 44 * We should arrive here only for device_del, since we don't support 45 * direct hot(un)plug of channels. 46 */ 47 assert(sch != NULL); 48 /* Subchannel is now disabled and no longer valid. */ 49 sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA | 50 PMCW_FLAGS_MASK_DNV); 51 52 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0); 53 54 object_unparent(OBJECT(dev)); 55 } 56 57 static void virtual_css_bus_reset(BusState *qbus) 58 { 59 /* This should actually be modelled via the generic css */ 60 css_reset(); 61 } 62 63 static char *virtual_css_bus_get_dev_path(DeviceState *dev) 64 { 65 CcwDevice *ccw_dev = CCW_DEVICE(dev); 66 SubchDev *sch = ccw_dev->sch; 67 VirtualCssBridge *bridge = 68 VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent); 69 70 /* 71 * We can't provide a dev path for backward compatibility on 72 * older machines, as it is visible in the migration stream. 73 */ 74 return bridge->css_dev_path ? 75 g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) : 76 NULL; 77 } 78 79 static void virtual_css_bus_class_init(ObjectClass *klass, void *data) 80 { 81 BusClass *k = BUS_CLASS(klass); 82 83 k->reset = virtual_css_bus_reset; 84 k->get_dev_path = virtual_css_bus_get_dev_path; 85 } 86 87 static const TypeInfo virtual_css_bus_info = { 88 .name = TYPE_VIRTUAL_CSS_BUS, 89 .parent = TYPE_BUS, 90 .instance_size = sizeof(VirtualCssBus), 91 .class_init = virtual_css_bus_class_init, 92 }; 93 94 VirtualCssBus *virtual_css_bus_init(void) 95 { 96 VirtualCssBus *cbus; 97 BusState *bus; 98 DeviceState *dev; 99 100 /* Create bridge device */ 101 dev = qdev_create(NULL, TYPE_VIRTUAL_CSS_BRIDGE); 102 object_property_add_child(qdev_get_machine(), TYPE_VIRTUAL_CSS_BRIDGE, 103 OBJECT(dev), NULL); 104 qdev_init_nofail(dev); 105 106 /* Create bus on bridge device */ 107 bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css"); 108 cbus = VIRTUAL_CSS_BUS(bus); 109 110 /* Enable hotplugging */ 111 qbus_set_hotplug_handler(bus, OBJECT(dev), &error_abort); 112 113 css_register_io_adapters(CSS_IO_ADAPTER_VIRTIO, true, false, 114 0, &error_abort); 115 116 return cbus; 117 } 118 119 /***************** Virtual-css Bus Bridge Device ********************/ 120 121 static Property virtual_css_bridge_properties[] = { 122 DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path, 123 true), 124 DEFINE_PROP_END_OF_LIST(), 125 }; 126 127 static bool prop_get_true(Object *obj, Error **errp) 128 { 129 return true; 130 } 131 132 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data) 133 { 134 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 135 DeviceClass *dc = DEVICE_CLASS(klass); 136 137 hc->unplug = ccw_device_unplug; 138 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 139 dc->props = virtual_css_bridge_properties; 140 object_class_property_add_bool(klass, "cssid-unrestricted", 141 prop_get_true, NULL, NULL); 142 object_class_property_set_description(klass, "cssid-unrestricted", 143 "A css device can use any cssid, regardless whether virtual" 144 " or not (read only, always true)", 145 NULL); 146 } 147 148 static const TypeInfo virtual_css_bridge_info = { 149 .name = TYPE_VIRTUAL_CSS_BRIDGE, 150 .parent = TYPE_SYS_BUS_DEVICE, 151 .instance_size = sizeof(VirtualCssBridge), 152 .class_init = virtual_css_bridge_class_init, 153 .interfaces = (InterfaceInfo[]) { 154 { TYPE_HOTPLUG_HANDLER }, 155 { } 156 } 157 }; 158 159 static void virtual_css_register(void) 160 { 161 type_register_static(&virtual_css_bridge_info); 162 type_register_static(&virtual_css_bus_info); 163 } 164 165 type_init(virtual_css_register) 166