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