hw/core/qdev-properties-system.c

   1 /*
   2  * qdev property parsing
   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 "qemu/osdep.h"
  14 #include "net/net.h"
  15 #include "hw/qdev.h"
  16 #include "qapi/error.h"
  17 #include "qapi/qmp/qerror.h"
  18 #include "sysemu/block-backend.h"
  19 #include "sysemu/blockdev.h"
  20 #include "hw/block/block.h"
  21 #include "net/hub.h"
  22 #include "qapi/visitor.h"
  23 #include "chardev/char-fe.h"
  24 #include "sysemu/iothread.h"
  25
  26 static void get_pointer(Object *obj, Visitor *v, Property *prop,
  27                         char *(*print)(void *ptr),
  28                         const char *name, Error **errp)
  29 {
  30     DeviceState *dev = DEVICE(obj);
  31     void **ptr = qdev_get_prop_ptr(dev, prop);
  32     char *p;
  33
  34     p = *ptr ? print(*ptr) : g_strdup("");
  35     visit_type_str(v, name, &p, errp);
  36     g_free(p);
  37 }
  38
  39 static void set_pointer(Object *obj, Visitor *v, Property *prop,
  40                         void (*parse)(DeviceState *dev, const char *str,
  41                                       void **ptr, const char *propname,
  42                                       Error **errp),
  43                         const char *name, Error **errp)
  44 {
  45     DeviceState *dev = DEVICE(obj);
  46     Error *local_err = NULL;
  47     void **ptr = qdev_get_prop_ptr(dev, prop);
  48     char *str;
  49
  50     if (dev->realized) {
  51         qdev_prop_set_after_realize(dev, name, errp);
  52         return;
  53     }
  54
  55     visit_type_str(v, name, &str, &local_err);
  56     if (local_err) {
  57         error_propagate(errp, local_err);
  58         return;
  59     }
  60     if (!*str) {
  61         g_free(str);
  62         *ptr = NULL;
  63         return;
  64     }
  65     parse(dev, str, ptr, prop->name, errp);
  66     g_free(str);
  67 }
  68
  69 /* --- drive --- */
  70
  71 static void parse_drive(DeviceState *dev, const char *str, void **ptr,
  72                         const char *propname, Error **errp)
  73 {
  74     BlockBackend *blk;
  75     bool blk_created = false;
  76     int ret;
  77
  78     blk = blk_by_name(str);
  79     if (!blk) {
  80         BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
  81         if (bs) {
  82             blk = blk_new(0, BLK_PERM_ALL);
  83             blk_created = true;
  84
  85             ret = blk_insert_bs(blk, bs, errp);
  86             if (ret < 0) {
  87                 goto fail;
  88             }
  89         }
  90     }
  91     if (!blk) {
  92         error_setg(errp, "Property '%s.%s' can't find value '%s'",
  93                    object_get_typename(OBJECT(dev)), propname, str);
  94         goto fail;
  95     }
  96     if (blk_attach_dev(blk, dev) < 0) {
  97         DriveInfo *dinfo = blk_legacy_dinfo(blk);
  98
  99         if (dinfo && dinfo->type != IF_NONE) {
 100             error_setg(errp, "Drive '%s' is already in use because "
 101                        "it has been automatically connected to another "
 102                        "device (did you need 'if=none' in the drive options?)",
 103                        str);
 104         } else {
 105             error_setg(errp, "Drive '%s' is already in use by another device",
 106                        str);
 107         }
 108         goto fail;
 109     }
 110
 111     *ptr = blk;
 112
 113 fail:
 114     if (blk_created) {
 115         /* If we need to keep a reference, blk_attach_dev() took it */
 116         blk_unref(blk);
 117     }
 118 }
 119
 120 static void release_drive(Object *obj, const char *name, void *opaque)
 121 {
 122     DeviceState *dev = DEVICE(obj);
 123     Property *prop = opaque;
 124     BlockBackend **ptr = qdev_get_prop_ptr(dev, prop);
 125
 126     if (*ptr) {
 127         AioContext *ctx = blk_get_aio_context(*ptr);
 128
 129         aio_context_acquire(ctx);
 130         blockdev_auto_del(*ptr);
 131         blk_detach_dev(*ptr, dev);
 132         aio_context_release(ctx);
 133     }
 134 }
 135
 136 static char *print_drive(void *ptr)
 137 {
 138     const char *name;
 139
 140     name = blk_name(ptr);
 141     if (!*name) {
 142         BlockDriverState *bs = blk_bs(ptr);
 143         if (bs) {
 144             name = bdrv_get_node_name(bs);
 145         }
 146     }
 147     return g_strdup(name);
 148 }
 149
 150 static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque,
 151                       Error **errp)
 152 {
 153     get_pointer(obj, v, opaque, print_drive, name, errp);
 154 }
 155
 156 static void set_drive(Object *obj, Visitor *v, const char *name, void *opaque,
 157                       Error **errp)
 158 {
 159     set_pointer(obj, v, opaque, parse_drive, name, errp);
 160 }
 161
 162 const PropertyInfo qdev_prop_drive = {
 163     .name  = "str",
 164     .description = "Node name or ID of a block device to use as a backend",
 165     .get   = get_drive,
 166     .set   = set_drive,
 167     .release = release_drive,
 168 };
 169
 170 /* --- character device --- */
 171
 172 static void get_chr(Object *obj, Visitor *v, const char *name, void *opaque,
 173                     Error **errp)
 174 {
 175     DeviceState *dev = DEVICE(obj);
 176     CharBackend *be = qdev_get_prop_ptr(dev, opaque);
 177     char *p;
 178
 179     p = g_strdup(be->chr && be->chr->label ? be->chr->label : "");
 180     visit_type_str(v, name, &p, errp);
 181     g_free(p);
 182 }
 183
 184 static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
 185                     Error **errp)
 186 {
 187     DeviceState *dev = DEVICE(obj);
 188     Error *local_err = NULL;
 189     Property *prop = opaque;
 190     CharBackend *be = qdev_get_prop_ptr(dev, prop);
 191     Chardev *s;
 192     char *str;
 193
 194     if (dev->realized) {
 195         qdev_prop_set_after_realize(dev, name, errp);
 196         return;
 197     }
 198
 199     visit_type_str(v, name, &str, &local_err);
 200     if (local_err) {
 201         error_propagate(errp, local_err);
 202         return;
 203     }
 204
 205     if (!*str) {
 206         g_free(str);
 207         be->chr = NULL;
 208         return;
 209     }
 210
 211     s = qemu_chr_find(str);
 212     if (s == NULL) {
 213         error_setg(errp, "Property '%s.%s' can't find value '%s'",
 214                    object_get_typename(obj), prop->name, str);
 215     } else if (!qemu_chr_fe_init(be, s, errp)) {
 216         error_prepend(errp, "Property '%s.%s' can't take value '%s': ",
 217                       object_get_typename(obj), prop->name, str);
 218     }
 219     g_free(str);
 220 }
 221
 222 static void release_chr(Object *obj, const char *name, void *opaque)
 223 {
 224     DeviceState *dev = DEVICE(obj);
 225     Property *prop = opaque;
 226     CharBackend *be = qdev_get_prop_ptr(dev, prop);
 227
 228     qemu_chr_fe_deinit(be, false);
 229 }
 230
 231 const PropertyInfo qdev_prop_chr = {
 232     .name  = "str",
 233     .description = "ID of a chardev to use as a backend",
 234     .get   = get_chr,
 235     .set   = set_chr,
 236     .release = release_chr,
 237 };
 238
 239 /* --- netdev device --- */
 240 static void get_netdev(Object *obj, Visitor *v, const char *name,
 241                        void *opaque, Error **errp)
 242 {
 243     DeviceState *dev = DEVICE(obj);
 244     Property *prop = opaque;
 245     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 246     char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");
 247
 248     visit_type_str(v, name, &p, errp);
 249     g_free(p);
 250 }
 251
 252 static void set_netdev(Object *obj, Visitor *v, const char *name,
 253                        void *opaque, Error **errp)
 254 {
 255     DeviceState *dev = DEVICE(obj);
 256     Property *prop = opaque;
 257     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 258     NetClientState **ncs = peers_ptr->ncs;
 259     NetClientState *peers[MAX_QUEUE_NUM];
 260     Error *local_err = NULL;
 261     int queues, err = 0, i = 0;
 262     char *str;
 263
 264     if (dev->realized) {
 265         qdev_prop_set_after_realize(dev, name, errp);
 266         return;
 267     }
 268
 269     visit_type_str(v, name, &str, &local_err);
 270     if (local_err) {
 271         error_propagate(errp, local_err);
 272         return;
 273     }
 274
 275     queues = qemu_find_net_clients_except(str, peers,
 276                                           NET_CLIENT_DRIVER_NIC,
 277                                           MAX_QUEUE_NUM);
 278     if (queues == 0) {
 279         err = -ENOENT;
 280         goto out;
 281     }
 282
 283     if (queues > MAX_QUEUE_NUM) {
 284         error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
 285                    str, queues, MAX_QUEUE_NUM);
 286         goto out;
 287     }
 288
 289     for (i = 0; i < queues; i++) {
 290         if (peers[i] == NULL) {
 291             err = -ENOENT;
 292             goto out;
 293         }
 294
 295         if (peers[i]->peer) {
 296             err = -EEXIST;
 297             goto out;
 298         }
 299
 300         if (ncs[i]) {
 301             err = -EINVAL;
 302             goto out;
 303         }
 304
 305         ncs[i] = peers[i];
 306         ncs[i]->queue_index = i;
 307     }
 308
 309     peers_ptr->queues = queues;
 310
 311 out:
 312     error_set_from_qdev_prop_error(errp, err, dev, prop, str);
 313     g_free(str);
 314 }
 315
 316 const PropertyInfo qdev_prop_netdev = {
 317     .name  = "str",
 318     .description = "ID of a netdev to use as a backend",
 319     .get   = get_netdev,
 320     .set   = set_netdev,
 321 };
 322
 323 /* --- vlan --- */
 324
 325 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
 326 {
 327     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 328
 329     if (*ptr) {
 330         int id;
 331         if (!net_hub_id_for_client(*ptr, &id)) {
 332             return snprintf(dest, len, "%d", id);
 333         }
 334     }
 335
 336     return snprintf(dest, len, "<null>");
 337 }
 338
 339 static void get_vlan(Object *obj, Visitor *v, const char *name, void *opaque,
 340                      Error **errp)
 341 {
 342     DeviceState *dev = DEVICE(obj);
 343     Property *prop = opaque;
 344     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 345     int32_t id = -1;
 346
 347     if (*ptr) {
 348         int hub_id;
 349         if (!net_hub_id_for_client(*ptr, &hub_id)) {
 350             id = hub_id;
 351         }
 352     }
 353
 354     visit_type_int32(v, name, &id, errp);
 355 }
 356
 357 static void set_vlan(Object *obj, Visitor *v, const char *name, void *opaque,
 358                      Error **errp)
 359 {
 360     DeviceState *dev = DEVICE(obj);
 361     Property *prop = opaque;
 362     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 363     NetClientState **ptr = &peers_ptr->ncs[0];
 364     Error *local_err = NULL;
 365     int32_t id;
 366     NetClientState *hubport;
 367
 368     if (dev->realized) {
 369         qdev_prop_set_after_realize(dev, name, errp);
 370         return;
 371     }
 372
 373     visit_type_int32(v, name, &id, &local_err);
 374     if (local_err) {
 375         error_propagate(errp, local_err);
 376         return;
 377     }
 378     if (id == -1) {
 379         *ptr = NULL;
 380         return;
 381     }
 382     if (*ptr) {
 383         error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
 384         return;
 385     }
 386
 387     hubport = net_hub_port_find(id);
 388     if (!hubport) {
 389         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 390                    name, prop->info->name);
 391         return;
 392     }
 393     *ptr = hubport;
 394 }
 395
 396 const PropertyInfo qdev_prop_vlan = {
 397     .name  = "int32",
 398     .description = "Integer VLAN id to connect to",
 399     .print = print_vlan,
 400     .get   = get_vlan,
 401     .set   = set_vlan,
 402 };
 403
 404 void qdev_prop_set_drive(DeviceState *dev, const char *name,
 405                          BlockBackend *value, Error **errp)
 406 {
 407     const char *ref = "";
 408
 409     if (value) {
 410         ref = blk_name(value);
 411         if (!*ref) {
 412             const BlockDriverState *bs = blk_bs(value);
 413             if (bs) {
 414                 ref = bdrv_get_node_name(bs);
 415             }
 416         }
 417     }
 418
 419     object_property_set_str(OBJECT(dev), ref, name, errp);
 420 }
 421
 422 void qdev_prop_set_chr(DeviceState *dev, const char *name,
 423                        Chardev *value)
 424 {
 425     assert(!value || value->label);
 426     object_property_set_str(OBJECT(dev),
 427                             value ? value->label : "", name, &error_abort);
 428 }
 429
 430 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
 431                           NetClientState *value)
 432 {
 433     assert(!value || value->name);
 434     object_property_set_str(OBJECT(dev),
 435                             value ? value->name : "", name, &error_abort);
 436 }
 437
 438 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 439 {
 440     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
 441     if (nd->netdev) {
 442         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
 443     }
 444     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 445         object_property_find(OBJECT(dev), "vectors", NULL)) {
 446         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
 447     }
 448     nd->instantiated = 1;
 449 }