hw/core/qdev-properties-system.c

   1 /*
   2  * qdev property parsing and global properties
   3  * (parts specific for qemu-system-*)
   4  *
   5  * This file is based on code from hw/qdev-properties.c from
   6  * commit 074a86fccd185616469dfcdc0e157f438aebba18,
   7  * Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "net/net.h"
  14 #include "hw/qdev.h"
  15 #include "qapi/qmp/qerror.h"
  16 #include "sysemu/blockdev.h"
  17 #include "hw/block/block.h"
  18 #include "net/hub.h"
  19 #include "qapi/visitor.h"
  20 #include "sysemu/char.h"
  21 #include "sysemu/iothread.h"
  22
  23 static void get_pointer(Object *obj, Visitor *v, Property *prop,
  24                         char *(*print)(void *ptr),
  25                         const char *name, Error **errp)
  26 {
  27     DeviceState *dev = DEVICE(obj);
  28     void **ptr = qdev_get_prop_ptr(dev, prop);
  29     char *p;
  30
  31     p = *ptr ? print(*ptr) : g_strdup("");
  32     visit_type_str(v, &p, name, errp);
  33     g_free(p);
  34 }
  35
  36 static void set_pointer(Object *obj, Visitor *v, Property *prop,
  37                         int (*parse)(DeviceState *dev, const char *str,
  38                                      void **ptr),
  39                         const char *name, Error **errp)
  40 {
  41     DeviceState *dev = DEVICE(obj);
  42     Error *local_err = NULL;
  43     void **ptr = qdev_get_prop_ptr(dev, prop);
  44     char *str;
  45     int ret;
  46
  47     if (dev->realized) {
  48         qdev_prop_set_after_realize(dev, name, errp);
  49         return;
  50     }
  51
  52     visit_type_str(v, &str, name, &local_err);
  53     if (local_err) {
  54         error_propagate(errp, local_err);
  55         return;
  56     }
  57     if (!*str) {
  58         g_free(str);
  59         *ptr = NULL;
  60         return;
  61     }
  62     ret = parse(dev, str, ptr);
  63     error_set_from_qdev_prop_error(errp, ret, dev, prop, str);
  64     g_free(str);
  65 }
  66
  67 /* --- drive --- */
  68
  69 static int parse_drive(DeviceState *dev, const char *str, void **ptr)
  70 {
  71     BlockDriverState *bs;
  72
  73     bs = bdrv_find(str);
  74     if (bs == NULL) {
  75         return -ENOENT;
  76     }
  77     if (bdrv_attach_dev(bs, dev) < 0) {
  78         return -EEXIST;
  79     }
  80     *ptr = bs;
  81     return 0;
  82 }
  83
  84 static void release_drive(Object *obj, const char *name, void *opaque)
  85 {
  86     DeviceState *dev = DEVICE(obj);
  87     Property *prop = opaque;
  88     BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
  89
  90     if (*ptr) {
  91         bdrv_detach_dev(*ptr, dev);
  92         blockdev_auto_del(*ptr);
  93     }
  94 }
  95
  96 static char *print_drive(void *ptr)
  97 {
  98     return g_strdup(bdrv_get_device_name(ptr));
  99 }
 100
 101 static void get_drive(Object *obj, Visitor *v, void *opaque,
 102                       const char *name, Error **errp)
 103 {
 104     get_pointer(obj, v, opaque, print_drive, name, errp);
 105 }
 106
 107 static void set_drive(Object *obj, Visitor *v, void *opaque,
 108                       const char *name, Error **errp)
 109 {
 110     set_pointer(obj, v, opaque, parse_drive, name, errp);
 111 }
 112
 113 PropertyInfo qdev_prop_drive = {
 114     .name  = "str",
 115     .description = "ID of a drive to use as a backend",
 116     .get   = get_drive,
 117     .set   = set_drive,
 118     .release = release_drive,
 119 };
 120
 121 /* --- character device --- */
 122
 123 static int parse_chr(DeviceState *dev, const char *str, void **ptr)
 124 {
 125     CharDriverState *chr = qemu_chr_find(str);
 126     if (chr == NULL) {
 127         return -ENOENT;
 128     }
 129     if (qemu_chr_fe_claim(chr) != 0) {
 130         return -EEXIST;
 131     }
 132     *ptr = chr;
 133     return 0;
 134 }
 135
 136 static void release_chr(Object *obj, const char *name, void *opaque)
 137 {
 138     DeviceState *dev = DEVICE(obj);
 139     Property *prop = opaque;
 140     CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);
 141     CharDriverState *chr = *ptr;
 142
 143     if (chr) {
 144         qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
 145         qemu_chr_fe_release(chr);
 146     }
 147 }
 148
 149
 150 static char *print_chr(void *ptr)
 151 {
 152     CharDriverState *chr = ptr;
 153     const char *val = chr->label ? chr->label : "";
 154
 155     return g_strdup(val);
 156 }
 157
 158 static void get_chr(Object *obj, Visitor *v, void *opaque,
 159                     const char *name, Error **errp)
 160 {
 161     get_pointer(obj, v, opaque, print_chr, name, errp);
 162 }
 163
 164 static void set_chr(Object *obj, Visitor *v, void *opaque,
 165                     const char *name, Error **errp)
 166 {
 167     set_pointer(obj, v, opaque, parse_chr, name, errp);
 168 }
 169
 170 PropertyInfo qdev_prop_chr = {
 171     .name  = "str",
 172     .description = "ID of a chardev to use as a backend",
 173     .get   = get_chr,
 174     .set   = set_chr,
 175     .release = release_chr,
 176 };
 177
 178 /* --- netdev device --- */
 179
 180 static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
 181 {
 182     NICPeers *peers_ptr = (NICPeers *)ptr;
 183     NetClientState **ncs = peers_ptr->ncs;
 184     NetClientState *peers[MAX_QUEUE_NUM];
 185     int queues, i = 0;
 186     int ret;
 187
 188     queues = qemu_find_net_clients_except(str, peers,
 189                                           NET_CLIENT_OPTIONS_KIND_NIC,
 190                                           MAX_QUEUE_NUM);
 191     if (queues == 0) {
 192         ret = -ENOENT;
 193         goto err;
 194     }
 195
 196     if (queues > MAX_QUEUE_NUM) {
 197         ret = -E2BIG;
 198         goto err;
 199     }
 200
 201     for (i = 0; i < queues; i++) {
 202         if (peers[i] == NULL) {
 203             ret = -ENOENT;
 204             goto err;
 205         }
 206
 207         if (peers[i]->peer) {
 208             ret = -EEXIST;
 209             goto err;
 210         }
 211
 212         if (ncs[i]) {
 213             ret = -EINVAL;
 214             goto err;
 215         }
 216
 217         ncs[i] = peers[i];
 218         ncs[i]->queue_index = i;
 219     }
 220
 221     peers_ptr->queues = queues;
 222
 223     return 0;
 224
 225 err:
 226     return ret;
 227 }
 228
 229 static char *print_netdev(void *ptr)
 230 {
 231     NetClientState *netdev = ptr;
 232     const char *val = netdev->name ? netdev->name : "";
 233
 234     return g_strdup(val);
 235 }
 236
 237 static void get_netdev(Object *obj, Visitor *v, void *opaque,
 238                        const char *name, Error **errp)
 239 {
 240     get_pointer(obj, v, opaque, print_netdev, name, errp);
 241 }
 242
 243 static void set_netdev(Object *obj, Visitor *v, void *opaque,
 244                        const char *name, Error **errp)
 245 {
 246     set_pointer(obj, v, opaque, parse_netdev, name, errp);
 247 }
 248
 249 PropertyInfo qdev_prop_netdev = {
 250     .name  = "str",
 251     .description = "ID of a netdev to use as a backend",
 252     .get   = get_netdev,
 253     .set   = set_netdev,
 254 };
 255
 256 /* --- vlan --- */
 257
 258 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
 259 {
 260     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 261
 262     if (*ptr) {
 263         int id;
 264         if (!net_hub_id_for_client(*ptr, &id)) {
 265             return snprintf(dest, len, "%d", id);
 266         }
 267     }
 268
 269     return snprintf(dest, len, "<null>");
 270 }
 271
 272 static void get_vlan(Object *obj, Visitor *v, void *opaque,
 273                      const char *name, Error **errp)
 274 {
 275     DeviceState *dev = DEVICE(obj);
 276     Property *prop = opaque;
 277     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 278     int32_t id = -1;
 279
 280     if (*ptr) {
 281         int hub_id;
 282         if (!net_hub_id_for_client(*ptr, &hub_id)) {
 283             id = hub_id;
 284         }
 285     }
 286
 287     visit_type_int32(v, &id, name, errp);
 288 }
 289
 290 static void set_vlan(Object *obj, Visitor *v, void *opaque,
 291                      const char *name, Error **errp)
 292 {
 293     DeviceState *dev = DEVICE(obj);
 294     Property *prop = opaque;
 295     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 296     NetClientState **ptr = &peers_ptr->ncs[0];
 297     Error *local_err = NULL;
 298     int32_t id;
 299     NetClientState *hubport;
 300
 301     if (dev->realized) {
 302         qdev_prop_set_after_realize(dev, name, errp);
 303         return;
 304     }
 305
 306     visit_type_int32(v, &id, name, &local_err);
 307     if (local_err) {
 308         error_propagate(errp, local_err);
 309         return;
 310     }
 311     if (id == -1) {
 312         *ptr = NULL;
 313         return;
 314     }
 315     if (*ptr) {
 316         error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
 317         return;
 318     }
 319
 320     hubport = net_hub_port_find(id);
 321     if (!hubport) {
 322         error_set(errp, QERR_INVALID_PARAMETER_VALUE,
 323                   name, prop->info->name);
 324         return;
 325     }
 326     *ptr = hubport;
 327 }
 328
 329 PropertyInfo qdev_prop_vlan = {
 330     .name  = "int32",
 331     .description = "Integer VLAN id to connect to",
 332     .print = print_vlan,
 333     .get   = get_vlan,
 334     .set   = set_vlan,
 335 };
 336
 337 int qdev_prop_set_drive(DeviceState *dev, const char *name,
 338                         BlockDriverState *value)
 339 {
 340     Error *err = NULL;
 341     const char *bdrv_name = value ? bdrv_get_device_name(value) : "";
 342     object_property_set_str(OBJECT(dev), bdrv_name,
 343                             name, &err);
 344     if (err) {
 345         qerror_report_err(err);
 346         error_free(err);
 347         return -1;
 348     }
 349     return 0;
 350 }
 351
 352 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name,
 353                                 BlockDriverState *value)
 354 {
 355     if (qdev_prop_set_drive(dev, name, value) < 0) {
 356         exit(1);
 357     }
 358 }
 359 void qdev_prop_set_chr(DeviceState *dev, const char *name,
 360                        CharDriverState *value)
 361 {
 362     assert(!value || value->label);
 363     object_property_set_str(OBJECT(dev),
 364                             value ? value->label : "", name, &error_abort);
 365 }
 366
 367 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
 368                           NetClientState *value)
 369 {
 370     assert(!value || value->name);
 371     object_property_set_str(OBJECT(dev),
 372                             value ? value->name : "", name, &error_abort);
 373 }
 374
 375 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 376 {
 377     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
 378     if (nd->netdev) {
 379         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
 380     }
 381     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 382         object_property_find(OBJECT(dev), "vectors", NULL)) {
 383         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
 384     }
 385     nd->instantiated = 1;
 386 }
 387
 388 static int qdev_add_one_global(QemuOpts *opts, void *opaque)
 389 {
 390     GlobalProperty *g;
 391
 392     g = g_malloc0(sizeof(*g));
 393     g->driver   = qemu_opt_get(opts, "driver");
 394     g->property = qemu_opt_get(opts, "property");
 395     g->value    = qemu_opt_get(opts, "value");
 396     g->user_provided = true;
 397     qdev_prop_register_global(g);
 398     return 0;
 399 }
 400
 401 void qemu_add_globals(void)
 402 {
 403     qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);
 404 }