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/block-backend.h"
  17 #include "sysemu/blockdev.h"
  18 #include "hw/block/block.h"
  19 #include "net/hub.h"
  20 #include "qapi/visitor.h"
  21 #include "sysemu/char.h"
  22 #include "sysemu/iothread.h"
  23
  24 static void get_pointer(Object *obj, Visitor *v, Property *prop,
  25                         char *(*print)(void *ptr),
  26                         const char *name, Error **errp)
  27 {
  28     DeviceState *dev = DEVICE(obj);
  29     void **ptr = qdev_get_prop_ptr(dev, prop);
  30     char *p;
  31
  32     p = *ptr ? print(*ptr) : g_strdup("");
  33     visit_type_str(v, &p, name, errp);
  34     g_free(p);
  35 }
  36
  37 static void set_pointer(Object *obj, Visitor *v, Property *prop,
  38                         int (*parse)(DeviceState *dev, const char *str,
  39                                      void **ptr),
  40                         const char *name, Error **errp)
  41 {
  42     DeviceState *dev = DEVICE(obj);
  43     Error *local_err = NULL;
  44     void **ptr = qdev_get_prop_ptr(dev, prop);
  45     char *str;
  46     int ret;
  47
  48     if (dev->realized) {
  49         qdev_prop_set_after_realize(dev, name, errp);
  50         return;
  51     }
  52
  53     visit_type_str(v, &str, name, &local_err);
  54     if (local_err) {
  55         error_propagate(errp, local_err);
  56         return;
  57     }
  58     if (!*str) {
  59         g_free(str);
  60         *ptr = NULL;
  61         return;
  62     }
  63     ret = parse(dev, str, ptr);
  64     error_set_from_qdev_prop_error(errp, ret, dev, prop, str);
  65     g_free(str);
  66 }
  67
  68 /* --- drive --- */
  69
  70 static int parse_drive(DeviceState *dev, const char *str, void **ptr)
  71 {
  72     BlockBackend *blk;
  73
  74     blk = blk_by_name(str);
  75     if (!blk) {
  76         return -ENOENT;
  77     }
  78     if (blk_attach_dev(blk, dev) < 0) {
  79         return -EEXIST;
  80     }
  81     *ptr = blk;
  82     return 0;
  83 }
  84
  85 static void release_drive(Object *obj, const char *name, void *opaque)
  86 {
  87     DeviceState *dev = DEVICE(obj);
  88     Property *prop = opaque;
  89     BlockBackend **ptr = qdev_get_prop_ptr(dev, prop);
  90
  91     if (*ptr) {
  92         blk_detach_dev(*ptr, dev);
  93         blockdev_auto_del(*ptr);
  94     }
  95 }
  96
  97 static char *print_drive(void *ptr)
  98 {
  99     return g_strdup(blk_name(ptr));
 100 }
 101
 102 static void get_drive(Object *obj, Visitor *v, void *opaque,
 103                       const char *name, Error **errp)
 104 {
 105     get_pointer(obj, v, opaque, print_drive, name, errp);
 106 }
 107
 108 static void set_drive(Object *obj, Visitor *v, void *opaque,
 109                       const char *name, Error **errp)
 110 {
 111     set_pointer(obj, v, opaque, parse_drive, name, errp);
 112 }
 113
 114 PropertyInfo qdev_prop_drive = {
 115     .name  = "str",
 116     .description = "ID of a drive to use as a backend",
 117     .get   = get_drive,
 118     .set   = set_drive,
 119     .release = release_drive,
 120 };
 121
 122 /* --- character device --- */
 123
 124 static int parse_chr(DeviceState *dev, const char *str, void **ptr)
 125 {
 126     CharDriverState *chr = qemu_chr_find(str);
 127     if (chr == NULL) {
 128         return -ENOENT;
 129     }
 130     if (qemu_chr_fe_claim(chr) != 0) {
 131         return -EEXIST;
 132     }
 133     *ptr = chr;
 134     return 0;
 135 }
 136
 137 static void release_chr(Object *obj, const char *name, void *opaque)
 138 {
 139     DeviceState *dev = DEVICE(obj);
 140     Property *prop = opaque;
 141     CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);
 142     CharDriverState *chr = *ptr;
 143
 144     if (chr) {
 145         qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
 146         qemu_chr_fe_release(chr);
 147     }
 148 }
 149
 150
 151 static char *print_chr(void *ptr)
 152 {
 153     CharDriverState *chr = ptr;
 154     const char *val = chr->label ? chr->label : "";
 155
 156     return g_strdup(val);
 157 }
 158
 159 static void get_chr(Object *obj, Visitor *v, void *opaque,
 160                     const char *name, Error **errp)
 161 {
 162     get_pointer(obj, v, opaque, print_chr, name, errp);
 163 }
 164
 165 static void set_chr(Object *obj, Visitor *v, void *opaque,
 166                     const char *name, Error **errp)
 167 {
 168     set_pointer(obj, v, opaque, parse_chr, name, errp);
 169 }
 170
 171 PropertyInfo qdev_prop_chr = {
 172     .name  = "str",
 173     .description = "ID of a chardev to use as a backend",
 174     .get   = get_chr,
 175     .set   = set_chr,
 176     .release = release_chr,
 177 };
 178
 179 /* --- netdev device --- */
 180 static void get_netdev(Object *obj, Visitor *v, void *opaque,
 181                        const char *name, Error **errp)
 182 {
 183     DeviceState *dev = DEVICE(obj);
 184     Property *prop = opaque;
 185     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 186     char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");
 187
 188     visit_type_str(v, &p, name, errp);
 189     g_free(p);
 190 }
 191
 192 static void set_netdev(Object *obj, Visitor *v, void *opaque,
 193                        const char *name, Error **errp)
 194 {
 195     DeviceState *dev = DEVICE(obj);
 196     Property *prop = opaque;
 197     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 198     NetClientState **ncs = peers_ptr->ncs;
 199     NetClientState *peers[MAX_QUEUE_NUM];
 200     Error *local_err = NULL;
 201     int queues, err = 0, i = 0;
 202     char *str;
 203
 204     if (dev->realized) {
 205         qdev_prop_set_after_realize(dev, name, errp);
 206         return;
 207     }
 208
 209     visit_type_str(v, &str, name, &local_err);
 210     if (local_err) {
 211         error_propagate(errp, local_err);
 212         return;
 213     }
 214
 215     queues = qemu_find_net_clients_except(str, peers,
 216                                           NET_CLIENT_OPTIONS_KIND_NIC,
 217                                           MAX_QUEUE_NUM);
 218     if (queues == 0) {
 219         err = -ENOENT;
 220         goto out;
 221     }
 222
 223     if (queues > MAX_QUEUE_NUM) {
 224         error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
 225                    str, queues, MAX_QUEUE_NUM);
 226         goto out;
 227     }
 228
 229     for (i = 0; i < queues; i++) {
 230         if (peers[i] == NULL) {
 231             err = -ENOENT;
 232             goto out;
 233         }
 234
 235         if (peers[i]->peer) {
 236             err = -EEXIST;
 237             goto out;
 238         }
 239
 240         if (ncs[i]) {
 241             err = -EINVAL;
 242             goto out;
 243         }
 244
 245         ncs[i] = peers[i];
 246         ncs[i]->queue_index = i;
 247     }
 248
 249     peers_ptr->queues = queues;
 250
 251 out:
 252     error_set_from_qdev_prop_error(errp, err, dev, prop, str);
 253     g_free(str);
 254 }
 255
 256 PropertyInfo qdev_prop_netdev = {
 257     .name  = "str",
 258     .description = "ID of a netdev to use as a backend",
 259     .get   = get_netdev,
 260     .set   = set_netdev,
 261 };
 262
 263 /* --- vlan --- */
 264
 265 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
 266 {
 267     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 268
 269     if (*ptr) {
 270         int id;
 271         if (!net_hub_id_for_client(*ptr, &id)) {
 272             return snprintf(dest, len, "%d", id);
 273         }
 274     }
 275
 276     return snprintf(dest, len, "<null>");
 277 }
 278
 279 static void get_vlan(Object *obj, Visitor *v, void *opaque,
 280                      const char *name, Error **errp)
 281 {
 282     DeviceState *dev = DEVICE(obj);
 283     Property *prop = opaque;
 284     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 285     int32_t id = -1;
 286
 287     if (*ptr) {
 288         int hub_id;
 289         if (!net_hub_id_for_client(*ptr, &hub_id)) {
 290             id = hub_id;
 291         }
 292     }
 293
 294     visit_type_int32(v, &id, name, errp);
 295 }
 296
 297 static void set_vlan(Object *obj, Visitor *v, void *opaque,
 298                      const char *name, Error **errp)
 299 {
 300     DeviceState *dev = DEVICE(obj);
 301     Property *prop = opaque;
 302     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 303     NetClientState **ptr = &peers_ptr->ncs[0];
 304     Error *local_err = NULL;
 305     int32_t id;
 306     NetClientState *hubport;
 307
 308     if (dev->realized) {
 309         qdev_prop_set_after_realize(dev, name, errp);
 310         return;
 311     }
 312
 313     visit_type_int32(v, &id, name, &local_err);
 314     if (local_err) {
 315         error_propagate(errp, local_err);
 316         return;
 317     }
 318     if (id == -1) {
 319         *ptr = NULL;
 320         return;
 321     }
 322     if (*ptr) {
 323         error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
 324         return;
 325     }
 326
 327     hubport = net_hub_port_find(id);
 328     if (!hubport) {
 329         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 330                    name, prop->info->name);
 331         return;
 332     }
 333     *ptr = hubport;
 334 }
 335
 336 PropertyInfo qdev_prop_vlan = {
 337     .name  = "int32",
 338     .description = "Integer VLAN id to connect to",
 339     .print = print_vlan,
 340     .get   = get_vlan,
 341     .set   = set_vlan,
 342 };
 343
 344 void qdev_prop_set_drive(DeviceState *dev, const char *name,
 345                          BlockBackend *value, Error **errp)
 346 {
 347     object_property_set_str(OBJECT(dev), value ? blk_name(value) : "",
 348                             name, errp);
 349 }
 350
 351 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name,
 352                                 BlockBackend *value)
 353 {
 354     Error *err = NULL;
 355
 356     qdev_prop_set_drive(dev, name, value, &err);
 357     if (err) {
 358         error_report_err(err);
 359         exit(1);
 360     }
 361 }
 362
 363 void qdev_prop_set_chr(DeviceState *dev, const char *name,
 364                        CharDriverState *value)
 365 {
 366     assert(!value || value->label);
 367     object_property_set_str(OBJECT(dev),
 368                             value ? value->label : "", name, &error_abort);
 369 }
 370
 371 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
 372                           NetClientState *value)
 373 {
 374     assert(!value || value->name);
 375     object_property_set_str(OBJECT(dev),
 376                             value ? value->name : "", name, &error_abort);
 377 }
 378
 379 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 380 {
 381     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
 382     if (nd->netdev) {
 383         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
 384     }
 385     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 386         object_property_find(OBJECT(dev), "vectors", NULL)) {
 387         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
 388     }
 389     nd->instantiated = 1;
 390 }
 391
 392 static int qdev_add_one_global(void *opaque, QemuOpts *opts, Error **errp)
 393 {
 394     GlobalProperty *g;
 395
 396     g = g_malloc0(sizeof(*g));
 397     g->driver   = qemu_opt_get(opts, "driver");
 398     g->property = qemu_opt_get(opts, "property");
 399     g->value    = qemu_opt_get(opts, "value");
 400     g->user_provided = true;
 401     qdev_prop_register_global(g);
 402     return 0;
 403 }
 404
 405 void qemu_add_globals(void)
 406 {
 407     qemu_opts_foreach(qemu_find_opts("global"),
 408                       qdev_add_one_global, NULL, NULL);
 409 }