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 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "hw/hotplug.h" 16 #include "hw/qdev-properties.h" 17 #include "hw/sysbus.h" 18 #include "qemu/bitops.h" 19 #include "qemu/module.h" 20 #include "hw/s390x/css.h" 21 #include "ccw-device.h" 22 #include "hw/s390x/css-bridge.h" 23 24 /* 25 * Invoke device-specific unplug handler, disable the subchannel 26 * (including sending a channel report to the guest) and remove the 27 * device from the virtual css bus. 28 */ 29 static void ccw_device_unplug(HotplugHandler *hotplug_dev, 30 DeviceState *dev, Error **errp) 31 { 32 CcwDevice *ccw_dev = CCW_DEVICE(dev); 33 CCWDeviceClass *k = CCW_DEVICE_GET_CLASS(ccw_dev); 34 SubchDev *sch = ccw_dev->sch; 35 Error *err = NULL; 36 37 if (k->unplug) { 38 k->unplug(hotplug_dev, dev, &err); 39 if (err) { 40 error_propagate(errp, err); 41 return; 42 } 43 } 44 45 /* 46 * We should arrive here only for device_del, since we don't support 47 * direct hot(un)plug of channels. 48 */ 49 assert(sch != NULL); 50 /* Subchannel is now disabled and no longer valid. */ 51 sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA | 52 PMCW_FLAGS_MASK_DNV); 53 54 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0); 55 56 qdev_unrealize(dev); 57 } 58 59 static void virtual_css_bus_reset(BusState *qbus) 60 { 61 /* This should actually be modelled via the generic css */ 62 css_reset(); 63 } 64 65 static char *virtual_css_bus_get_dev_path(DeviceState *dev) 66 { 67 CcwDevice *ccw_dev = CCW_DEVICE(dev); 68 SubchDev *sch = ccw_dev->sch; 69 VirtualCssBridge *bridge = 70 VIRTUAL_CSS_BRIDGE(qdev_get_parent_bus(dev)->parent); 71 72 /* 73 * We can't provide a dev path for backward compatibility on 74 * older machines, as it is visible in the migration stream. 75 */ 76 return bridge->css_dev_path ? 77 g_strdup_printf("/%02x.%1x.%04x", sch->cssid, sch->ssid, sch->devno) : 78 NULL; 79 } 80 81 static void virtual_css_bus_class_init(ObjectClass *klass, void *data) 82 { 83 BusClass *k = BUS_CLASS(klass); 84 85 k->reset = virtual_css_bus_reset; 86 k->get_dev_path = virtual_css_bus_get_dev_path; 87 } 88 89 static const TypeInfo virtual_css_bus_info = { 90 .name = TYPE_VIRTUAL_CSS_BUS, 91 .parent = TYPE_BUS, 92 .instance_size = sizeof(VirtualCssBus), 93 .class_init = virtual_css_bus_class_init, 94 }; 95 96 VirtualCssBus *virtual_css_bus_init(void) 97 { 98 VirtualCssBus *cbus; 99 BusState *bus; 100 DeviceState *dev; 101 102 /* Create bridge device */ 103 dev = qdev_new(TYPE_VIRTUAL_CSS_BRIDGE); 104 object_property_add_child(qdev_get_machine(), TYPE_VIRTUAL_CSS_BRIDGE, 105 OBJECT(dev)); 106 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 107 108 /* Create bus on bridge device */ 109 bus = qbus_new(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css"); 110 cbus = VIRTUAL_CSS_BUS(bus); 111 112 /* Enable hotplugging */ 113 qbus_set_hotplug_handler(bus, OBJECT(dev)); 114 115 css_register_io_adapters(CSS_IO_ADAPTER_VIRTIO, true, false, 116 0, &error_abort); 117 118 return cbus; 119 } 120 121 /***************** Virtual-css Bus Bridge Device ********************/ 122 123 static Property virtual_css_bridge_properties[] = { 124 DEFINE_PROP_BOOL("css_dev_path", VirtualCssBridge, css_dev_path, 125 true), 126 DEFINE_PROP_END_OF_LIST(), 127 }; 128 129 static bool prop_get_true(Object *obj, Error **errp) 130 { 131 return true; 132 } 133 134 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data) 135 { 136 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 137 DeviceClass *dc = DEVICE_CLASS(klass); 138 139 hc->unplug = ccw_device_unplug; 140 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 141 device_class_set_props(dc, virtual_css_bridge_properties); 142 object_class_property_add_bool(klass, "cssid-unrestricted", 143 prop_get_true, NULL); 144 object_class_property_set_description(klass, "cssid-unrestricted", 145 "A css device can use any cssid, regardless whether virtual" 146 " or not (read only, always true)"); 147 } 148 149 static const TypeInfo virtual_css_bridge_info = { 150 .name = TYPE_VIRTUAL_CSS_BRIDGE, 151 .parent = TYPE_SYS_BUS_DEVICE, 152 .instance_size = sizeof(VirtualCssBridge), 153 .class_init = virtual_css_bridge_class_init, 154 .interfaces = (InterfaceInfo[]) { 155 { TYPE_HOTPLUG_HANDLER }, 156 { } 157 } 158 }; 159 160 static void virtual_css_register(void) 161 { 162 type_register_static(&virtual_css_bridge_info); 163 type_register_static(&virtual_css_bus_info); 164 } 165 166 type_init(virtual_css_register) 167