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