drivers/xen/sys-hypervisor.c

   1 /*
   2  *  copyright (c) 2006 IBM Corporation
   3  *  Authored by: Mike D. Day <ncmike@us.ibm.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License version 2 as
   7  *  published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/kobject.h>
  14
  15 #include <asm/xen/hypervisor.h>
  16 #include <asm/xen/hypercall.h>
  17
  18 #include <xen/xen.h>
  19 #include <xen/xenbus.h>
  20 #include <xen/interface/xen.h>
  21 #include <xen/interface/version.h>
  22
  23 #define HYPERVISOR_ATTR_RO(_name) \
  24 static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)
  25
  26 #define HYPERVISOR_ATTR_RW(_name) \
  27 static struct hyp_sysfs_attr _name##_attr = \
  28         __ATTR(_name, 0644, _name##_show, _name##_store)
  29
  30 struct hyp_sysfs_attr {
  31         struct attribute attr;
  32         ssize_t (*show)(struct hyp_sysfs_attr *, char *);
  33         ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
  34         void *hyp_attr_data;
  35 };
  36
  37 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
  38 {
  39         return sprintf(buffer, "xen\n");
  40 }
  41
  42 HYPERVISOR_ATTR_RO(type);
  43
  44 static int __init xen_sysfs_type_init(void)
  45 {
  46         return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
  47 }
  48
  49 static void xen_sysfs_type_destroy(void)
  50 {
  51         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
  52 }
  53
  54 /* xen version attributes */
  55 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
  56 {
  57         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  58         if (version)
  59                 return sprintf(buffer, "%d\n", version >> 16);
  60         return -ENODEV;
  61 }
  62
  63 HYPERVISOR_ATTR_RO(major);
  64
  65 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
  66 {
  67         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  68         if (version)
  69                 return sprintf(buffer, "%d\n", version & 0xff);
  70         return -ENODEV;
  71 }
  72
  73 HYPERVISOR_ATTR_RO(minor);
  74
  75 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
  76 {
  77         int ret = -ENOMEM;
  78         char *extra;
  79
  80         extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
  81         if (extra) {
  82                 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
  83                 if (!ret)
  84                         ret = sprintf(buffer, "%s\n", extra);
  85                 kfree(extra);
  86         }
  87
  88         return ret;
  89 }
  90
  91 HYPERVISOR_ATTR_RO(extra);
  92
  93 static struct attribute *version_attrs[] = {
  94         &major_attr.attr,
  95         &minor_attr.attr,
  96         &extra_attr.attr,
  97         NULL
  98 };
  99
 100 static const struct attribute_group version_group = {
 101         .name = "version",
 102         .attrs = version_attrs,
 103 };
 104
 105 static int __init xen_sysfs_version_init(void)
 106 {
 107         return sysfs_create_group(hypervisor_kobj, &version_group);
 108 }
 109
 110 static void xen_sysfs_version_destroy(void)
 111 {
 112         sysfs_remove_group(hypervisor_kobj, &version_group);
 113 }
 114
 115 /* UUID */
 116
 117 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
 118 {
 119         char *vm, *val;
 120         int ret;
 121         extern int xenstored_ready;
 122
 123         if (!xenstored_ready)
 124                 return -EBUSY;
 125
 126         vm = xenbus_read(XBT_NIL, "vm", "", NULL);
 127         if (IS_ERR(vm))
 128                 return PTR_ERR(vm);
 129         val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
 130         kfree(vm);
 131         if (IS_ERR(val))
 132                 return PTR_ERR(val);
 133         ret = sprintf(buffer, "%s\n", val);
 134         kfree(val);
 135         return ret;
 136 }
 137
 138 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
 139 {
 140         xen_domain_handle_t uuid;
 141         int ret;
 142         ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
 143         if (ret)
 144                 return uuid_show_fallback(attr, buffer);
 145         ret = sprintf(buffer, "%pU\n", uuid);
 146         return ret;
 147 }
 148
 149 HYPERVISOR_ATTR_RO(uuid);
 150
 151 static int __init xen_sysfs_uuid_init(void)
 152 {
 153         return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
 154 }
 155
 156 static void xen_sysfs_uuid_destroy(void)
 157 {
 158         sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
 159 }
 160
 161 /* xen compilation attributes */
 162
 163 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
 164 {
 165         int ret = -ENOMEM;
 166         struct xen_compile_info *info;
 167
 168         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 169         if (info) {
 170                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 171                 if (!ret)
 172                         ret = sprintf(buffer, "%s\n", info->compiler);
 173                 kfree(info);
 174         }
 175
 176         return ret;
 177 }
 178
 179 HYPERVISOR_ATTR_RO(compiler);
 180
 181 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
 182 {
 183         int ret = -ENOMEM;
 184         struct xen_compile_info *info;
 185
 186         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 187         if (info) {
 188                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 189                 if (!ret)
 190                         ret = sprintf(buffer, "%s\n", info->compile_by);
 191                 kfree(info);
 192         }
 193
 194         return ret;
 195 }
 196
 197 HYPERVISOR_ATTR_RO(compiled_by);
 198
 199 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
 200 {
 201         int ret = -ENOMEM;
 202         struct xen_compile_info *info;
 203
 204         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 205         if (info) {
 206                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 207                 if (!ret)
 208                         ret = sprintf(buffer, "%s\n", info->compile_date);
 209                 kfree(info);
 210         }
 211
 212         return ret;
 213 }
 214
 215 HYPERVISOR_ATTR_RO(compile_date);
 216
 217 static struct attribute *xen_compile_attrs[] = {
 218         &compiler_attr.attr,
 219         &compiled_by_attr.attr,
 220         &compile_date_attr.attr,
 221         NULL
 222 };
 223
 224 static const struct attribute_group xen_compilation_group = {
 225         .name = "compilation",
 226         .attrs = xen_compile_attrs,
 227 };
 228
 229 static int __init xen_compilation_init(void)
 230 {
 231         return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
 232 }
 233
 234 static void xen_compilation_destroy(void)
 235 {
 236         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
 237 }
 238
 239 /* xen properties info */
 240
 241 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
 242 {
 243         int ret = -ENOMEM;
 244         char *caps;
 245
 246         caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
 247         if (caps) {
 248                 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
 249                 if (!ret)
 250                         ret = sprintf(buffer, "%s\n", caps);
 251                 kfree(caps);
 252         }
 253
 254         return ret;
 255 }
 256
 257 HYPERVISOR_ATTR_RO(capabilities);
 258
 259 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
 260 {
 261         int ret = -ENOMEM;
 262         char *cset;
 263
 264         cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
 265         if (cset) {
 266                 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
 267                 if (!ret)
 268                         ret = sprintf(buffer, "%s\n", cset);
 269                 kfree(cset);
 270         }
 271
 272         return ret;
 273 }
 274
 275 HYPERVISOR_ATTR_RO(changeset);
 276
 277 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
 278 {
 279         int ret = -ENOMEM;
 280         struct xen_platform_parameters *parms;
 281
 282         parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
 283         if (parms) {
 284                 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
 285                                              parms);
 286                 if (!ret)
 287                         ret = sprintf(buffer, "%lx\n", parms->virt_start);
 288                 kfree(parms);
 289         }
 290
 291         return ret;
 292 }
 293
 294 HYPERVISOR_ATTR_RO(virtual_start);
 295
 296 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
 297 {
 298         int ret;
 299
 300         ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
 301         if (ret > 0)
 302                 ret = sprintf(buffer, "%x\n", ret);
 303
 304         return ret;
 305 }
 306
 307 HYPERVISOR_ATTR_RO(pagesize);
 308
 309 static ssize_t xen_feature_show(int index, char *buffer)
 310 {
 311         ssize_t ret;
 312         struct xen_feature_info info;
 313
 314         info.submap_idx = index;
 315         ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
 316         if (!ret)
 317                 ret = sprintf(buffer, "%08x", info.submap);
 318
 319         return ret;
 320 }
 321
 322 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
 323 {
 324         ssize_t len;
 325         int i;
 326
 327         len = 0;
 328         for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
 329                 int ret = xen_feature_show(i, buffer + len);
 330                 if (ret < 0) {
 331                         if (len == 0)
 332                                 len = ret;
 333                         break;
 334                 }
 335                 len += ret;
 336         }
 337         if (len > 0)
 338                 buffer[len++] = '\n';
 339
 340         return len;
 341 }
 342
 343 HYPERVISOR_ATTR_RO(features);
 344
 345 static struct attribute *xen_properties_attrs[] = {
 346         &capabilities_attr.attr,
 347         &changeset_attr.attr,
 348         &virtual_start_attr.attr,
 349         &pagesize_attr.attr,
 350         &features_attr.attr,
 351         NULL
 352 };
 353
 354 static const struct attribute_group xen_properties_group = {
 355         .name = "properties",
 356         .attrs = xen_properties_attrs,
 357 };
 358
 359 static int __init xen_properties_init(void)
 360 {
 361         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
 362 }
 363
 364 static void xen_properties_destroy(void)
 365 {
 366         sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
 367 }
 368
 369 static int __init hyper_sysfs_init(void)
 370 {
 371         int ret;
 372
 373         if (!xen_domain())
 374                 return -ENODEV;
 375
 376         ret = xen_sysfs_type_init();
 377         if (ret)
 378                 goto out;
 379         ret = xen_sysfs_version_init();
 380         if (ret)
 381                 goto version_out;
 382         ret = xen_compilation_init();
 383         if (ret)
 384                 goto comp_out;
 385         ret = xen_sysfs_uuid_init();
 386         if (ret)
 387                 goto uuid_out;
 388         ret = xen_properties_init();
 389         if (ret)
 390                 goto prop_out;
 391
 392         goto out;
 393
 394 prop_out:
 395         xen_sysfs_uuid_destroy();
 396 uuid_out:
 397         xen_compilation_destroy();
 398 comp_out:
 399         xen_sysfs_version_destroy();
 400 version_out:
 401         xen_sysfs_type_destroy();
 402 out:
 403         return ret;
 404 }
 405
 406 static void __exit hyper_sysfs_exit(void)
 407 {
 408         xen_properties_destroy();
 409         xen_compilation_destroy();
 410         xen_sysfs_uuid_destroy();
 411         xen_sysfs_version_destroy();
 412         xen_sysfs_type_destroy();
 413
 414 }
 415 module_init(hyper_sysfs_init);
 416 module_exit(hyper_sysfs_exit);
 417
 418 static ssize_t hyp_sysfs_show(struct kobject *kobj,
 419                               struct attribute *attr,
 420                               char *buffer)
 421 {
 422         struct hyp_sysfs_attr *hyp_attr;
 423         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 424         if (hyp_attr->show)
 425                 return hyp_attr->show(hyp_attr, buffer);
 426         return 0;
 427 }
 428
 429 static ssize_t hyp_sysfs_store(struct kobject *kobj,
 430                                struct attribute *attr,
 431                                const char *buffer,
 432                                size_t len)
 433 {
 434         struct hyp_sysfs_attr *hyp_attr;
 435         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 436         if (hyp_attr->store)
 437                 return hyp_attr->store(hyp_attr, buffer, len);
 438         return 0;
 439 }
 440
 441 static const struct sysfs_ops hyp_sysfs_ops = {
 442         .show = hyp_sysfs_show,
 443         .store = hyp_sysfs_store,
 444 };
 445
 446 static struct kobj_type hyp_sysfs_kobj_type = {
 447         .sysfs_ops = &hyp_sysfs_ops,
 448 };
 449
 450 static int __init hypervisor_subsys_init(void)
 451 {
 452         if (!xen_domain())
 453                 return -ENODEV;
 454
 455         hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
 456         return 0;
 457 }
 458 device_initcall(hypervisor_subsys_init);