| 1 | /* |
| 2 | * Dynamic device configuration and creation -- buses. |
| 3 | * |
| 4 | * Copyright (c) 2009 CodeSourcery |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "hw/core/qdev-properties.h" |
| 22 | #include "qemu/ctype.h" |
| 23 | #include "qemu/module.h" |
| 24 | #include "qapi/error.h" |
| 25 | |
| 26 | void qbus_set_hotplug_handler(BusState *bus, Object *handler) |
| 27 | { |
| 28 | object_property_set_link(OBJECT(bus), QDEV_HOTPLUG_HANDLER_PROPERTY, |
| 29 | handler, &error_abort); |
| 30 | } |
| 31 | |
| 32 | void qbus_set_bus_hotplug_handler(BusState *bus) |
| 33 | { |
| 34 | qbus_set_hotplug_handler(bus, OBJECT(bus)); |
| 35 | } |
| 36 | |
| 37 | int qbus_walk_children(BusState *bus, |
| 38 | qdev_walkerfn *pre_devfn, qbus_walkerfn *pre_busfn, |
| 39 | qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn, |
| 40 | void *opaque) |
| 41 | { |
| 42 | BusChild *kid; |
| 43 | int err; |
| 44 | |
| 45 | if (pre_busfn) { |
| 46 | err = pre_busfn(bus, opaque); |
| 47 | if (err) { |
| 48 | return err; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | WITH_RCU_READ_LOCK_GUARD() { |
| 53 | QTAILQ_FOREACH_RCU(kid, &bus->children, sibling) { |
| 54 | err = qdev_walk_children(kid->child, |
| 55 | pre_devfn, pre_busfn, |
| 56 | post_devfn, post_busfn, opaque); |
| 57 | if (err < 0) { |
| 58 | return err; |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | if (post_busfn) { |
| 64 | err = post_busfn(bus, opaque); |
| 65 | if (err) { |
| 66 | return err; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | void bus_cold_reset(BusState *bus) |
| 74 | { |
| 75 | resettable_reset(OBJECT(bus), RESET_TYPE_COLD); |
| 76 | } |
| 77 | |
| 78 | bool bus_is_in_reset(BusState *bus) |
| 79 | { |
| 80 | return resettable_is_in_reset(OBJECT(bus)); |
| 81 | } |
| 82 | |
| 83 | static ResettableState *bus_get_reset_state(Object *obj) |
| 84 | { |
| 85 | BusState *bus = BUS(obj); |
| 86 | return &bus->reset; |
| 87 | } |
| 88 | |
| 89 | static void bus_reset_child_foreach(Object *obj, ResettableChildCallback cb, |
| 90 | void *opaque, ResetType type) |
| 91 | { |
| 92 | BusState *bus = BUS(obj); |
| 93 | BusChild *kid; |
| 94 | |
| 95 | WITH_RCU_READ_LOCK_GUARD() { |
| 96 | QTAILQ_FOREACH_RCU(kid, &bus->children, sibling) { |
| 97 | cb(OBJECT(kid->child), opaque, type); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | static void qbus_init_internal(BusState *bus, DeviceState *parent, |
| 103 | const char *name) |
| 104 | { |
| 105 | const char *typename = object_get_typename(OBJECT(bus)); |
| 106 | BusClass *bc; |
| 107 | int i, bus_id; |
| 108 | |
| 109 | bus->parent = parent; |
| 110 | |
| 111 | if (name) { |
| 112 | bus->name = g_strdup(name); |
| 113 | } else if (bus->parent && bus->parent->id) { |
| 114 | /* parent device has id -> use it plus parent-bus-id for bus name */ |
| 115 | bus_id = bus->parent->num_child_bus; |
| 116 | bus->name = g_strdup_printf("%s.%d", bus->parent->id, bus_id); |
| 117 | } else { |
| 118 | /* no id -> use lowercase bus type plus global bus-id for bus name */ |
| 119 | bc = BUS_GET_CLASS(bus); |
| 120 | bus_id = bc->automatic_ids++; |
| 121 | bus->name = g_strdup_printf("%s.%d", typename, bus_id); |
| 122 | for (i = 0; bus->name[i]; i++) { |
| 123 | bus->name[i] = qemu_tolower(bus->name[i]); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | if (bus->parent) { |
| 128 | QLIST_INSERT_HEAD(&bus->parent->child_bus, bus, sibling); |
| 129 | bus->parent->num_child_bus++; |
| 130 | object_property_add_child(OBJECT(bus->parent), bus->name, OBJECT(bus)); |
| 131 | object_unref(OBJECT(bus)); |
| 132 | } else { |
| 133 | /* The only bus without a parent is the main system bus */ |
| 134 | assert(bus == sysbus_get_default()); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | static void bus_unparent(Object *obj) |
| 139 | { |
| 140 | BusState *bus = BUS(obj); |
| 141 | BusChild *kid; |
| 142 | |
| 143 | /* Only the main system bus has no parent, and that bus is never freed */ |
| 144 | assert(bus->parent); |
| 145 | |
| 146 | while ((kid = QTAILQ_FIRST(&bus->children)) != NULL) { |
| 147 | DeviceState *dev = kid->child; |
| 148 | object_unparent(OBJECT(dev)); |
| 149 | } |
| 150 | QLIST_REMOVE(bus, sibling); |
| 151 | bus->parent->num_child_bus--; |
| 152 | bus->parent = NULL; |
| 153 | } |
| 154 | |
| 155 | void qbus_init(void *bus, size_t size, const char *typename, |
| 156 | DeviceState *parent, const char *name) |
| 157 | { |
| 158 | object_initialize(bus, size, typename); |
| 159 | qbus_init_internal(bus, parent, name); |
| 160 | } |
| 161 | |
| 162 | BusState *qbus_new(const char *typename, DeviceState *parent, const char *name) |
| 163 | { |
| 164 | BusState *bus; |
| 165 | |
| 166 | bus = BUS(object_new(typename)); |
| 167 | qbus_init_internal(bus, parent, name); |
| 168 | |
| 169 | return bus; |
| 170 | } |
| 171 | |
| 172 | bool qbus_realize(BusState *bus, Error **errp) |
| 173 | { |
| 174 | return object_property_set_bool(OBJECT(bus), "realized", true, errp); |
| 175 | } |
| 176 | |
| 177 | void qbus_unrealize(BusState *bus) |
| 178 | { |
| 179 | object_property_set_bool(OBJECT(bus), "realized", false, &error_abort); |
| 180 | } |
| 181 | |
| 182 | static bool bus_get_realized(Object *obj, Error **errp) |
| 183 | { |
| 184 | BusState *bus = BUS(obj); |
| 185 | |
| 186 | return bus->realized; |
| 187 | } |
| 188 | |
| 189 | static void bus_set_realized(Object *obj, bool value, Error **errp) |
| 190 | { |
| 191 | BusState *bus = BUS(obj); |
| 192 | BusClass *bc = BUS_GET_CLASS(bus); |
| 193 | BusChild *kid; |
| 194 | |
| 195 | if (value && !bus->realized) { |
| 196 | if (bc->realize) { |
| 197 | bc->realize(bus, errp); |
| 198 | } |
| 199 | |
| 200 | /* TODO: recursive realization */ |
| 201 | } else if (!value && bus->realized) { |
| 202 | WITH_RCU_READ_LOCK_GUARD() { |
| 203 | QTAILQ_FOREACH_RCU(kid, &bus->children, sibling) { |
| 204 | DeviceState *dev = kid->child; |
| 205 | qdev_unrealize(dev); |
| 206 | } |
| 207 | } |
| 208 | if (bc->unrealize) { |
| 209 | bc->unrealize(bus); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | bus->realized = value; |
| 214 | } |
| 215 | |
| 216 | static void qbus_initfn(Object *obj) |
| 217 | { |
| 218 | BusState *bus = BUS(obj); |
| 219 | |
| 220 | QTAILQ_INIT(&bus->children); |
| 221 | object_property_add_link(obj, QDEV_HOTPLUG_HANDLER_PROPERTY, |
| 222 | TYPE_HOTPLUG_HANDLER, |
| 223 | (Object **)&bus->hotplug_handler, |
| 224 | object_property_allow_set_link, |
| 225 | 0); |
| 226 | object_property_add_bool(obj, "realized", |
| 227 | bus_get_realized, bus_set_realized); |
| 228 | } |
| 229 | |
| 230 | static char *default_bus_get_fw_dev_path(DeviceState *dev) |
| 231 | { |
| 232 | return g_strdup(object_get_typename(OBJECT(dev))); |
| 233 | } |
| 234 | |
| 235 | static void bus_class_init(ObjectClass *class, const void *data) |
| 236 | { |
| 237 | BusClass *bc = BUS_CLASS(class); |
| 238 | ResettableClass *rc = RESETTABLE_CLASS(class); |
| 239 | |
| 240 | class->unparent = bus_unparent; |
| 241 | bc->get_fw_dev_path = default_bus_get_fw_dev_path; |
| 242 | |
| 243 | rc->get_state = bus_get_reset_state; |
| 244 | rc->child_foreach = bus_reset_child_foreach; |
| 245 | } |
| 246 | |
| 247 | static void qbus_finalize(Object *obj) |
| 248 | { |
| 249 | BusState *bus = BUS(obj); |
| 250 | |
| 251 | g_free(bus->name); |
| 252 | } |
| 253 | |
| 254 | static const TypeInfo bus_info = { |
| 255 | .name = TYPE_BUS, |
| 256 | .parent = TYPE_OBJECT, |
| 257 | .instance_size = sizeof(BusState), |
| 258 | .abstract = true, |
| 259 | .class_size = sizeof(BusClass), |
| 260 | .instance_init = qbus_initfn, |
| 261 | .instance_finalize = qbus_finalize, |
| 262 | .class_init = bus_class_init, |
| 263 | .interfaces = (const InterfaceInfo[]) { |
| 264 | { TYPE_RESETTABLE_INTERFACE }, |
| 265 | { } |
| 266 | }, |
| 267 | }; |
| 268 | |
| 269 | static void bus_register_types(void) |
| 270 | { |
| 271 | type_register_static(&bus_info); |
| 272 | } |
| 273 | |
| 274 | type_init(bus_register_types) |