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 do_parse_drive(DeviceState *dev, const char *str, void **ptr,
  73                            const char *propname, bool iothread, 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             /*
  84              * If the device supports iothreads, it will make sure to move the
  85              * block node to the right AioContext if necessary (or fail if this
  86              * isn't possible because of other users). Devices that are not
  87              * aware of iothreads require their BlockBackends to be in the main
  88              * AioContext.
  89              */
  90             AioContext *ctx = iothread ? bdrv_get_aio_context(bs) :
  91                                          qemu_get_aio_context();
  92             blk = blk_new(ctx, 0, BLK_PERM_ALL);
  93             blk_created = true;
  94
  95             ret = blk_insert_bs(blk, bs, errp);
  96             if (ret < 0) {
  97                 goto fail;
  98             }
  99         }
 100     }
 101     if (!blk) {
 102         error_setg(errp, "Property '%s.%s' can't find value '%s'",
 103                    object_get_typename(OBJECT(dev)), propname, str);
 104         goto fail;
 105     }
 106     if (blk_attach_dev(blk, dev) < 0) {
 107         DriveInfo *dinfo = blk_legacy_dinfo(blk);
 108
 109         if (dinfo && dinfo->type != IF_NONE) {
 110             error_setg(errp, "Drive '%s' is already in use because "
 111                        "it has been automatically connected to another "
 112                        "device (did you need 'if=none' in the drive options?)",
 113                        str);
 114         } else {
 115             error_setg(errp, "Drive '%s' is already in use by another device",
 116                        str);
 117         }
 118         goto fail;
 119     }
 120
 121     *ptr = blk;
 122
 123 fail:
 124     if (blk_created) {
 125         /* If we need to keep a reference, blk_attach_dev() took it */
 126         blk_unref(blk);
 127     }
 128 }
 129
 130 static void parse_drive(DeviceState *dev, const char *str, void **ptr,
 131                         const char *propname, Error **errp)
 132 {
 133     do_parse_drive(dev, str, ptr, propname, false, errp);
 134 }
 135
 136 static void parse_drive_iothread(DeviceState *dev, const char *str, void **ptr,
 137                                  const char *propname, Error **errp)
 138 {
 139     do_parse_drive(dev, str, ptr, propname, true, errp);
 140 }
 141
 142 static void release_drive(Object *obj, const char *name, void *opaque)
 143 {
 144     DeviceState *dev = DEVICE(obj);
 145     Property *prop = opaque;
 146     BlockBackend **ptr = qdev_get_prop_ptr(dev, prop);
 147
 148     if (*ptr) {
 149         AioContext *ctx = blk_get_aio_context(*ptr);
 150
 151         aio_context_acquire(ctx);
 152         blockdev_auto_del(*ptr);
 153         blk_detach_dev(*ptr, dev);
 154         aio_context_release(ctx);
 155     }
 156 }
 157
 158 static char *print_drive(void *ptr)
 159 {
 160     const char *name;
 161
 162     name = blk_name(ptr);
 163     if (!*name) {
 164         BlockDriverState *bs = blk_bs(ptr);
 165         if (bs) {
 166             name = bdrv_get_node_name(bs);
 167         }
 168     }
 169     return g_strdup(name);
 170 }
 171
 172 static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque,
 173                       Error **errp)
 174 {
 175     get_pointer(obj, v, opaque, print_drive, name, errp);
 176 }
 177
 178 static void set_drive(Object *obj, Visitor *v, const char *name, void *opaque,
 179                       Error **errp)
 180 {
 181     set_pointer(obj, v, opaque, parse_drive, name, errp);
 182 }
 183
 184 static void set_drive_iothread(Object *obj, Visitor *v, const char *name,
 185                                void *opaque, Error **errp)
 186 {
 187     set_pointer(obj, v, opaque, parse_drive_iothread, name, errp);
 188 }
 189
 190 const PropertyInfo qdev_prop_drive = {
 191     .name  = "str",
 192     .description = "Node name or ID of a block device to use as a backend",
 193     .get   = get_drive,
 194     .set   = set_drive,
 195     .release = release_drive,
 196 };
 197
 198 const PropertyInfo qdev_prop_drive_iothread = {
 199     .name  = "str",
 200     .description = "Node name or ID of a block device to use as a backend",
 201     .get   = get_drive,
 202     .set   = set_drive_iothread,
 203     .release = release_drive,
 204 };
 205
 206 /* --- character device --- */
 207
 208 static void get_chr(Object *obj, Visitor *v, const char *name, void *opaque,
 209                     Error **errp)
 210 {
 211     DeviceState *dev = DEVICE(obj);
 212     CharBackend *be = qdev_get_prop_ptr(dev, opaque);
 213     char *p;
 214
 215     p = g_strdup(be->chr && be->chr->label ? be->chr->label : "");
 216     visit_type_str(v, name, &p, errp);
 217     g_free(p);
 218 }
 219
 220 static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
 221                     Error **errp)
 222 {
 223     DeviceState *dev = DEVICE(obj);
 224     Error *local_err = NULL;
 225     Property *prop = opaque;
 226     CharBackend *be = qdev_get_prop_ptr(dev, prop);
 227     Chardev *s;
 228     char *str;
 229
 230     if (dev->realized) {
 231         qdev_prop_set_after_realize(dev, name, errp);
 232         return;
 233     }
 234
 235     visit_type_str(v, name, &str, &local_err);
 236     if (local_err) {
 237         error_propagate(errp, local_err);
 238         return;
 239     }
 240
 241     if (!*str) {
 242         g_free(str);
 243         be->chr = NULL;
 244         return;
 245     }
 246
 247     s = qemu_chr_find(str);
 248     if (s == NULL) {
 249         error_setg(errp, "Property '%s.%s' can't find value '%s'",
 250                    object_get_typename(obj), prop->name, str);
 251     } else if (!qemu_chr_fe_init(be, s, errp)) {
 252         error_prepend(errp, "Property '%s.%s' can't take value '%s': ",
 253                       object_get_typename(obj), prop->name, str);
 254     }
 255     g_free(str);
 256 }
 257
 258 static void release_chr(Object *obj, const char *name, void *opaque)
 259 {
 260     DeviceState *dev = DEVICE(obj);
 261     Property *prop = opaque;
 262     CharBackend *be = qdev_get_prop_ptr(dev, prop);
 263
 264     qemu_chr_fe_deinit(be, false);
 265 }
 266
 267 const PropertyInfo qdev_prop_chr = {
 268     .name  = "str",
 269     .description = "ID of a chardev to use as a backend",
 270     .get   = get_chr,
 271     .set   = set_chr,
 272     .release = release_chr,
 273 };
 274
 275 /* --- netdev device --- */
 276 static void get_netdev(Object *obj, Visitor *v, const char *name,
 277                        void *opaque, Error **errp)
 278 {
 279     DeviceState *dev = DEVICE(obj);
 280     Property *prop = opaque;
 281     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 282     char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");
 283
 284     visit_type_str(v, name, &p, errp);
 285     g_free(p);
 286 }
 287
 288 static void set_netdev(Object *obj, Visitor *v, const char *name,
 289                        void *opaque, Error **errp)
 290 {
 291     DeviceState *dev = DEVICE(obj);
 292     Property *prop = opaque;
 293     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
 294     NetClientState **ncs = peers_ptr->ncs;
 295     NetClientState *peers[MAX_QUEUE_NUM];
 296     Error *local_err = NULL;
 297     int queues, err = 0, i = 0;
 298     char *str;
 299
 300     if (dev->realized) {
 301         qdev_prop_set_after_realize(dev, name, errp);
 302         return;
 303     }
 304
 305     visit_type_str(v, name, &str, &local_err);
 306     if (local_err) {
 307         error_propagate(errp, local_err);
 308         return;
 309     }
 310
 311     queues = qemu_find_net_clients_except(str, peers,
 312                                           NET_CLIENT_DRIVER_NIC,
 313                                           MAX_QUEUE_NUM);
 314     if (queues == 0) {
 315         err = -ENOENT;
 316         goto out;
 317     }
 318
 319     if (queues > MAX_QUEUE_NUM) {
 320         error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
 321                    str, queues, MAX_QUEUE_NUM);
 322         goto out;
 323     }
 324
 325     for (i = 0; i < queues; i++) {
 326
 327         if (peers[i]->peer) {
 328             err = -EEXIST;
 329             goto out;
 330         }
 331
 332         if (ncs[i]) {
 333             err = -EINVAL;
 334             goto out;
 335         }
 336
 337         ncs[i] = peers[i];
 338         ncs[i]->queue_index = i;
 339     }
 340
 341     peers_ptr->queues = queues;
 342
 343 out:
 344     error_set_from_qdev_prop_error(errp, err, dev, prop, str);
 345     g_free(str);
 346 }
 347
 348 const PropertyInfo qdev_prop_netdev = {
 349     .name  = "str",
 350     .description = "ID of a netdev to use as a backend",
 351     .get   = get_netdev,
 352     .set   = set_netdev,
 353 };
 354
 355
 356 void qdev_prop_set_drive(DeviceState *dev, const char *name,
 357                          BlockBackend *value, Error **errp)
 358 {
 359     const char *ref = "";
 360
 361     if (value) {
 362         ref = blk_name(value);
 363         if (!*ref) {
 364             const BlockDriverState *bs = blk_bs(value);
 365             if (bs) {
 366                 ref = bdrv_get_node_name(bs);
 367             }
 368         }
 369     }
 370
 371     object_property_set_str(OBJECT(dev), ref, name, errp);
 372 }
 373
 374 void qdev_prop_set_chr(DeviceState *dev, const char *name,
 375                        Chardev *value)
 376 {
 377     assert(!value || value->label);
 378     object_property_set_str(OBJECT(dev),
 379                             value ? value->label : "", name, &error_abort);
 380 }
 381
 382 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
 383                           NetClientState *value)
 384 {
 385     assert(!value || value->name);
 386     object_property_set_str(OBJECT(dev),
 387                             value ? value->name : "", name, &error_abort);
 388 }
 389
 390 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
 391 {
 392     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
 393     if (nd->netdev) {
 394         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
 395     }
 396     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 397         object_property_find(OBJECT(dev), "vectors", NULL)) {
 398         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
 399     }
 400     nd->instantiated = 1;
 401 }