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
 181 static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
 182 {
 183     NICPeers *peers_ptr = (NICPeers *)ptr;
 184     NetClientState **ncs = peers_ptr->ncs;
 185     NetClientState *peers[MAX_QUEUE_NUM];
 186     int queues, i = 0;
 187     int ret;
 188
 189     queues = qemu_find_net_clients_except(str, peers,
 190                                           NET_CLIENT_OPTIONS_KIND_NIC,
 191                                           MAX_QUEUE_NUM);
 192     if (queues == 0) {
 193         ret = -ENOENT;
 194         goto err;
 195     }
 196
 197     if (queues > MAX_QUEUE_NUM) {
 198         ret = -E2BIG;
 199         goto err;
 200     }
 201
 202     for (i = 0; i < queues; i++) {
 203         if (peers[i] == NULL) {
 204             ret = -ENOENT;
 205             goto err;
 206         }
 207
 208         if (peers[i]->peer) {
 209             ret = -EEXIST;
 210             goto err;
 211         }
 212
 213         if (ncs[i]) {
 214             ret = -EINVAL;
 215             goto err;
 216         }
 217
 218         ncs[i] = peers[i];
 219         ncs[i]->queue_index = i;
 220     }
 221
 222     peers_ptr->queues = queues;
 223
 224     return 0;
 225
 226 err:
 227     return ret;
 228 }
 229
 230 static char *print_netdev(void *ptr)
 231 {
 232     NetClientState *netdev = ptr;
 233     const char *val = netdev->name ? netdev->name : "";
 234
 235     return g_strdup(val);
 236 }
 237
 238 static void get_netdev(Object *obj, Visitor *v, void *opaque,
 239                        const char *name, Error **errp)
 240 {
 241     get_pointer(obj, v, opaque, print_netdev, name, errp);
 242 }
 243
 244 static void set_netdev(Object *obj, Visitor *v, void *opaque,
 245                        const char *name, Error **errp)
 246 {
 247     set_pointer(obj, v, opaque, parse_netdev, name, errp);
 248 }
 249
 250 PropertyInfo qdev_prop_netdev = {
 251     .name  = "str",
 252     .description = "ID of a netdev to use as a backend",
 253     .get   = get_netdev,
 254     .set   = set_netdev,
 255 };
 256
 257 /* --- vlan --- */
 258
 259 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
 260 {
 261     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 262
 263     if (*ptr) {
 264         int id;
 265         if (!net_hub_id_for_client(*ptr, &id)) {
 266             return snprintf(dest, len, "%d", id);
 267         }
 268     }
 269
 270     return snprintf(dest, len, "<null>");
 271 }
 272
 273 static void get_vlan(Object *obj, Visitor *v, void *opaque,
 274                      const char *name, Error **errp)
 275 {
 276     DeviceState *dev = DEVICE(obj);
 277     Property *prop = opaque;
 278     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
 279     int32_t id = -1;
 280
 281     if (*ptr) {
 282         int hub_id;
 283         if (!net_hub_id_for_client(*ptr, &hub_id)) {
 284             id = hub_id;
 285         }
 286     }
 287
 288     visit_type_int32(v, &id, name, errp);
 289 }
 290
 291 static void set_vlan(Object *obj, Visitor *v, void *opaque,
 292                      const char *name, Error **errp)
 293 {
 294     DeviceState *dev = DEVICE(obj);
 295     Property *prop = opaque;
 296     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 297     NetClientState **ptr = &peers_ptr->ncs[0];
 298     Error *local_err = NULL;
 299     int32_t id;
 300     NetClientState *hubport;
 301
 302     if (dev->realized) {
 303         qdev_prop_set_after_realize(dev, name, errp);
 304         return;
 305     }
 306
 307     visit_type_int32(v, &id, name, &local_err);
 308     if (local_err) {
 309         error_propagate(errp, local_err);
 310         return;
 311     }
 312     if (id == -1) {
 313         *ptr = NULL;
 314         return;
 315     }
 316     if (*ptr) {
 317         error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
 318         return;
 319     }
 320
 321     hubport = net_hub_port_find(id);
 322     if (!hubport) {
 323         error_set(errp, QERR_INVALID_PARAMETER_VALUE,
 324                   name, prop->info->name);
 325         return;
 326     }
 327     *ptr = hubport;
 328 }
 329
 330 PropertyInfo qdev_prop_vlan = {
 331     .name  = "int32",
 332     .description = "Integer VLAN id to connect to",
 333     .print = print_vlan,
 334     .get   = get_vlan,
 335     .set   = set_vlan,
 336 };
 337
 338 int qdev_prop_set_drive(DeviceState *dev, const char *name,
 339                         BlockBackend *value)
 340 {
 341     Error *err = NULL;
 342     object_property_set_str(OBJECT(dev),
 343                             value ? blk_name(value) : "", 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                                 BlockBackend *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 }