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