kernel/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 #include <linux/err.h>
  15
  16 #include <asm/xen/hypervisor.h>
  17 #include <asm/xen/hypercall.h>
  18
  19 #include <xen/xen.h>
  20 #include <xen/xenbus.h>
  21 #include <xen/interface/xen.h>
  22 #include <xen/interface/version.h>
  23 #ifdef CONFIG_XEN_HAVE_VPMU
  24 #include <xen/interface/xenpmu.h>
  25 #endif
  26
  27 #define HYPERVISOR_ATTR_RO(_name) \
  28 static struct hyp_sysfs_attr  _name##_attr = __ATTR_RO(_name)
  29
  30 #define HYPERVISOR_ATTR_RW(_name) \
  31 static struct hyp_sysfs_attr _name##_attr = \
  32         __ATTR(_name, 0644, _name##_show, _name##_store)
  33
  34 struct hyp_sysfs_attr {
  35         struct attribute attr;
  36         ssize_t (*show)(struct hyp_sysfs_attr *, char *);
  37         ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
  38         void *hyp_attr_data;
  39 };
  40
  41 static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
  42 {
  43         return sprintf(buffer, "xen\n");
  44 }
  45
  46 HYPERVISOR_ATTR_RO(type);
  47
  48 static int __init xen_sysfs_type_init(void)
  49 {
  50         return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
  51 }
  52
  53 static void xen_sysfs_type_destroy(void)
  54 {
  55         sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
  56 }
  57
  58 /* xen version attributes */
  59 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
  60 {
  61         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  62         if (version)
  63                 return sprintf(buffer, "%d\n", version >> 16);
  64         return -ENODEV;
  65 }
  66
  67 HYPERVISOR_ATTR_RO(major);
  68
  69 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
  70 {
  71         int version = HYPERVISOR_xen_version(XENVER_version, NULL);
  72         if (version)
  73                 return sprintf(buffer, "%d\n", version & 0xff);
  74         return -ENODEV;
  75 }
  76
  77 HYPERVISOR_ATTR_RO(minor);
  78
  79 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
  80 {
  81         int ret = -ENOMEM;
  82         char *extra;
  83
  84         extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
  85         if (extra) {
  86                 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
  87                 if (!ret)
  88                         ret = sprintf(buffer, "%s\n", extra);
  89                 kfree(extra);
  90         }
  91
  92         return ret;
  93 }
  94
  95 HYPERVISOR_ATTR_RO(extra);
  96
  97 static struct attribute *version_attrs[] = {
  98         &major_attr.attr,
  99         &minor_attr.attr,
 100         &extra_attr.attr,
 101         NULL
 102 };
 103
 104 static const struct attribute_group version_group = {
 105         .name = "version",
 106         .attrs = version_attrs,
 107 };
 108
 109 static int __init xen_sysfs_version_init(void)
 110 {
 111         return sysfs_create_group(hypervisor_kobj, &version_group);
 112 }
 113
 114 static void xen_sysfs_version_destroy(void)
 115 {
 116         sysfs_remove_group(hypervisor_kobj, &version_group);
 117 }
 118
 119 /* UUID */
 120
 121 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer)
 122 {
 123         char *vm, *val;
 124         int ret;
 125         extern int xenstored_ready;
 126
 127         if (!xenstored_ready)
 128                 return -EBUSY;
 129
 130         vm = xenbus_read(XBT_NIL, "vm", "", NULL);
 131         if (IS_ERR(vm))
 132                 return PTR_ERR(vm);
 133         val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
 134         kfree(vm);
 135         if (IS_ERR(val))
 136                 return PTR_ERR(val);
 137         ret = sprintf(buffer, "%s\n", val);
 138         kfree(val);
 139         return ret;
 140 }
 141
 142 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
 143 {
 144         xen_domain_handle_t uuid;
 145         int ret;
 146         ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid);
 147         if (ret)
 148                 return uuid_show_fallback(attr, buffer);
 149         ret = sprintf(buffer, "%pU\n", uuid);
 150         return ret;
 151 }
 152
 153 HYPERVISOR_ATTR_RO(uuid);
 154
 155 static int __init xen_sysfs_uuid_init(void)
 156 {
 157         return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
 158 }
 159
 160 static void xen_sysfs_uuid_destroy(void)
 161 {
 162         sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
 163 }
 164
 165 /* xen compilation attributes */
 166
 167 static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
 168 {
 169         int ret = -ENOMEM;
 170         struct xen_compile_info *info;
 171
 172         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 173         if (info) {
 174                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 175                 if (!ret)
 176                         ret = sprintf(buffer, "%s\n", info->compiler);
 177                 kfree(info);
 178         }
 179
 180         return ret;
 181 }
 182
 183 HYPERVISOR_ATTR_RO(compiler);
 184
 185 static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
 186 {
 187         int ret = -ENOMEM;
 188         struct xen_compile_info *info;
 189
 190         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 191         if (info) {
 192                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 193                 if (!ret)
 194                         ret = sprintf(buffer, "%s\n", info->compile_by);
 195                 kfree(info);
 196         }
 197
 198         return ret;
 199 }
 200
 201 HYPERVISOR_ATTR_RO(compiled_by);
 202
 203 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
 204 {
 205         int ret = -ENOMEM;
 206         struct xen_compile_info *info;
 207
 208         info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
 209         if (info) {
 210                 ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
 211                 if (!ret)
 212                         ret = sprintf(buffer, "%s\n", info->compile_date);
 213                 kfree(info);
 214         }
 215
 216         return ret;
 217 }
 218
 219 HYPERVISOR_ATTR_RO(compile_date);
 220
 221 static struct attribute *xen_compile_attrs[] = {
 222         &compiler_attr.attr,
 223         &compiled_by_attr.attr,
 224         &compile_date_attr.attr,
 225         NULL
 226 };
 227
 228 static const struct attribute_group xen_compilation_group = {
 229         .name = "compilation",
 230         .attrs = xen_compile_attrs,
 231 };
 232
 233 static int __init xen_compilation_init(void)
 234 {
 235         return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
 236 }
 237
 238 static void xen_compilation_destroy(void)
 239 {
 240         sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
 241 }
 242
 243 /* xen properties info */
 244
 245 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
 246 {
 247         int ret = -ENOMEM;
 248         char *caps;
 249
 250         caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
 251         if (caps) {
 252                 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
 253                 if (!ret)
 254                         ret = sprintf(buffer, "%s\n", caps);
 255                 kfree(caps);
 256         }
 257
 258         return ret;
 259 }
 260
 261 HYPERVISOR_ATTR_RO(capabilities);
 262
 263 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
 264 {
 265         int ret = -ENOMEM;
 266         char *cset;
 267
 268         cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
 269         if (cset) {
 270                 ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
 271                 if (!ret)
 272                         ret = sprintf(buffer, "%s\n", cset);
 273                 kfree(cset);
 274         }
 275
 276         return ret;
 277 }
 278
 279 HYPERVISOR_ATTR_RO(changeset);
 280
 281 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
 282 {
 283         int ret = -ENOMEM;
 284         struct xen_platform_parameters *parms;
 285
 286         parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
 287         if (parms) {
 288                 ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
 289                                              parms);
 290                 if (!ret)
 291                         ret = sprintf(buffer, "%"PRI_xen_ulong"\n",
 292                                       parms->virt_start);
 293                 kfree(parms);
 294         }
 295
 296         return ret;
 297 }
 298
 299 HYPERVISOR_ATTR_RO(virtual_start);
 300
 301 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
 302 {
 303         int ret;
 304
 305         ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
 306         if (ret > 0)
 307                 ret = sprintf(buffer, "%x\n", ret);
 308
 309         return ret;
 310 }
 311
 312 HYPERVISOR_ATTR_RO(pagesize);
 313
 314 static ssize_t xen_feature_show(int index, char *buffer)
 315 {
 316         ssize_t ret;
 317         struct xen_feature_info info;
 318
 319         info.submap_idx = index;
 320         ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
 321         if (!ret)
 322                 ret = sprintf(buffer, "%08x", info.submap);
 323
 324         return ret;
 325 }
 326
 327 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
 328 {
 329         ssize_t len;
 330         int i;
 331
 332         len = 0;
 333         for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
 334                 int ret = xen_feature_show(i, buffer + len);
 335                 if (ret < 0) {
 336                         if (len == 0)
 337                                 len = ret;
 338                         break;
 339                 }
 340                 len += ret;
 341         }
 342         if (len > 0)
 343                 buffer[len++] = '\n';
 344
 345         return len;
 346 }
 347
 348 HYPERVISOR_ATTR_RO(features);
 349
 350 static struct attribute *xen_properties_attrs[] = {
 351         &capabilities_attr.attr,
 352         &changeset_attr.attr,
 353         &virtual_start_attr.attr,
 354         &pagesize_attr.attr,
 355         &features_attr.attr,
 356         NULL
 357 };
 358
 359 static const struct attribute_group xen_properties_group = {
 360         .name = "properties",
 361         .attrs = xen_properties_attrs,
 362 };
 363
 364 static int __init xen_properties_init(void)
 365 {
 366         return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
 367 }
 368
 369 static void xen_properties_destroy(void)
 370 {
 371         sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
 372 }
 373
 374 #ifdef CONFIG_XEN_HAVE_VPMU
 375 struct pmu_mode {
 376         const char *name;
 377         uint32_t mode;
 378 };
 379
 380 static struct pmu_mode pmu_modes[] = {
 381         {"off", XENPMU_MODE_OFF},
 382         {"self", XENPMU_MODE_SELF},
 383         {"hv", XENPMU_MODE_HV},
 384         {"all", XENPMU_MODE_ALL}
 385 };
 386
 387 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
 388                               const char *buffer, size_t len)
 389 {
 390         int ret;
 391         struct xen_pmu_params xp;
 392         int i;
 393
 394         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 395                 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) {
 396                         xp.val = pmu_modes[i].mode;
 397                         break;
 398                 }
 399         }
 400
 401         if (i == ARRAY_SIZE(pmu_modes))
 402                 return -EINVAL;
 403
 404         xp.version.maj = XENPMU_VER_MAJ;
 405         xp.version.min = XENPMU_VER_MIN;
 406         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
 407         if (ret)
 408                 return ret;
 409
 410         return len;
 411 }
 412
 413 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
 414 {
 415         int ret;
 416         struct xen_pmu_params xp;
 417         int i;
 418         uint32_t mode;
 419
 420         xp.version.maj = XENPMU_VER_MAJ;
 421         xp.version.min = XENPMU_VER_MIN;
 422         ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
 423         if (ret)
 424                 return ret;
 425
 426         mode = (uint32_t)xp.val;
 427         for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
 428                 if (mode == pmu_modes[i].mode)
 429                         return sprintf(buffer, "%s\n", pmu_modes[i].name);
 430         }
 431
 432         return -EINVAL;
 433 }
 434 HYPERVISOR_ATTR_RW(pmu_mode);
 435
 436 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr,
 437                                   const char *buffer, size_t len)
 438 {
 439         int ret;
 440         uint32_t features;
 441         struct xen_pmu_params xp;
 442
 443         ret = kstrtou32(buffer, 0, &features);
 444         if (ret)
 445                 return ret;
 446
 447         xp.val = features;
 448         xp.version.maj = XENPMU_VER_MAJ;
 449         xp.version.min = XENPMU_VER_MIN;
 450         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp);
 451         if (ret)
 452                 return ret;
 453
 454         return len;
 455 }
 456
 457 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer)
 458 {
 459         int ret;
 460         struct xen_pmu_params xp;
 461
 462         xp.version.maj = XENPMU_VER_MAJ;
 463         xp.version.min = XENPMU_VER_MIN;
 464         ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp);
 465         if (ret)
 466                 return ret;
 467
 468         return sprintf(buffer, "0x%x\n", (uint32_t)xp.val);
 469 }
 470 HYPERVISOR_ATTR_RW(pmu_features);
 471
 472 static struct attribute *xen_pmu_attrs[] = {
 473         &pmu_mode_attr.attr,
 474         &pmu_features_attr.attr,
 475         NULL
 476 };
 477
 478 static const struct attribute_group xen_pmu_group = {
 479         .name = "pmu",
 480         .attrs = xen_pmu_attrs,
 481 };
 482
 483 static int __init xen_pmu_init(void)
 484 {
 485         return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
 486 }
 487
 488 static void xen_pmu_destroy(void)
 489 {
 490         sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
 491 }
 492 #endif
 493
 494 static int __init hyper_sysfs_init(void)
 495 {
 496         int ret;
 497
 498         if (!xen_domain())
 499                 return -ENODEV;
 500
 501         ret = xen_sysfs_type_init();
 502         if (ret)
 503                 goto out;
 504         ret = xen_sysfs_version_init();
 505         if (ret)
 506                 goto version_out;
 507         ret = xen_compilation_init();
 508         if (ret)
 509                 goto comp_out;
 510         ret = xen_sysfs_uuid_init();
 511         if (ret)
 512                 goto uuid_out;
 513         ret = xen_properties_init();
 514         if (ret)
 515                 goto prop_out;
 516 #ifdef CONFIG_XEN_HAVE_VPMU
 517         if (xen_initial_domain()) {
 518                 ret = xen_pmu_init();
 519                 if (ret) {
 520                         xen_properties_destroy();
 521                         goto prop_out;
 522                 }
 523         }
 524 #endif
 525         goto out;
 526
 527 prop_out:
 528         xen_sysfs_uuid_destroy();
 529 uuid_out:
 530         xen_compilation_destroy();
 531 comp_out:
 532         xen_sysfs_version_destroy();
 533 version_out:
 534         xen_sysfs_type_destroy();
 535 out:
 536         return ret;
 537 }
 538
 539 static void __exit hyper_sysfs_exit(void)
 540 {
 541 #ifdef CONFIG_XEN_HAVE_VPMU
 542         xen_pmu_destroy();
 543 #endif
 544         xen_properties_destroy();
 545         xen_compilation_destroy();
 546         xen_sysfs_uuid_destroy();
 547         xen_sysfs_version_destroy();
 548         xen_sysfs_type_destroy();
 549
 550 }
 551 module_init(hyper_sysfs_init);
 552 module_exit(hyper_sysfs_exit);
 553
 554 static ssize_t hyp_sysfs_show(struct kobject *kobj,
 555                               struct attribute *attr,
 556                               char *buffer)
 557 {
 558         struct hyp_sysfs_attr *hyp_attr;
 559         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 560         if (hyp_attr->show)
 561                 return hyp_attr->show(hyp_attr, buffer);
 562         return 0;
 563 }
 564
 565 static ssize_t hyp_sysfs_store(struct kobject *kobj,
 566                                struct attribute *attr,
 567                                const char *buffer,
 568                                size_t len)
 569 {
 570         struct hyp_sysfs_attr *hyp_attr;
 571         hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
 572         if (hyp_attr->store)
 573                 return hyp_attr->store(hyp_attr, buffer, len);
 574         return 0;
 575 }
 576
 577 static const struct sysfs_ops hyp_sysfs_ops = {
 578         .show = hyp_sysfs_show,
 579         .store = hyp_sysfs_store,
 580 };
 581
 582 static struct kobj_type hyp_sysfs_kobj_type = {
 583         .sysfs_ops = &hyp_sysfs_ops,
 584 };
 585
 586 static int __init hypervisor_subsys_init(void)
 587 {
 588         if (!xen_domain())
 589                 return -ENODEV;
 590
 591         hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
 592         return 0;
 593 }
 594 device_initcall(hypervisor_subsys_init);