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/init.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 ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer) 54 { 55 const char *type; 56 57 switch (xen_domain_type) { 58 case XEN_NATIVE: 59 /* ARM only. */ 60 type = "Xen"; 61 break; 62 case XEN_PV_DOMAIN: 63 type = "PV"; 64 break; 65 case XEN_HVM_DOMAIN: 66 type = xen_pvh_domain() ? "PVH" : "HVM"; 67 break; 68 default: 69 return -EINVAL; 70 } 71 72 return sprintf(buffer, "%s\n", type); 73 } 74 75 HYPERVISOR_ATTR_RO(guest_type); 76 77 static int __init xen_sysfs_guest_type_init(void) 78 { 79 return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr); 80 } 81 82 /* xen version attributes */ 83 static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer) 84 { 85 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 86 if (version) 87 return sprintf(buffer, "%d\n", version >> 16); 88 return -ENODEV; 89 } 90 91 HYPERVISOR_ATTR_RO(major); 92 93 static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer) 94 { 95 int version = HYPERVISOR_xen_version(XENVER_version, NULL); 96 if (version) 97 return sprintf(buffer, "%d\n", version & 0xff); 98 return -ENODEV; 99 } 100 101 HYPERVISOR_ATTR_RO(minor); 102 103 static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer) 104 { 105 int ret = -ENOMEM; 106 char *extra; 107 108 extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL); 109 if (extra) { 110 ret = HYPERVISOR_xen_version(XENVER_extraversion, extra); 111 if (!ret) 112 ret = sprintf(buffer, "%s\n", extra); 113 kfree(extra); 114 } 115 116 return ret; 117 } 118 119 HYPERVISOR_ATTR_RO(extra); 120 121 static struct attribute *version_attrs[] = { 122 &major_attr.attr, 123 &minor_attr.attr, 124 &extra_attr.attr, 125 NULL 126 }; 127 128 static const struct attribute_group version_group = { 129 .name = "version", 130 .attrs = version_attrs, 131 }; 132 133 static int __init xen_sysfs_version_init(void) 134 { 135 return sysfs_create_group(hypervisor_kobj, &version_group); 136 } 137 138 /* UUID */ 139 140 static ssize_t uuid_show_fallback(struct hyp_sysfs_attr *attr, char *buffer) 141 { 142 char *vm, *val; 143 int ret; 144 extern int xenstored_ready; 145 146 if (!xenstored_ready) 147 return -EBUSY; 148 149 vm = xenbus_read(XBT_NIL, "vm", "", NULL); 150 if (IS_ERR(vm)) 151 return PTR_ERR(vm); 152 val = xenbus_read(XBT_NIL, vm, "uuid", NULL); 153 kfree(vm); 154 if (IS_ERR(val)) 155 return PTR_ERR(val); 156 ret = sprintf(buffer, "%s\n", val); 157 kfree(val); 158 return ret; 159 } 160 161 static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer) 162 { 163 xen_domain_handle_t uuid; 164 int ret; 165 ret = HYPERVISOR_xen_version(XENVER_guest_handle, uuid); 166 if (ret) 167 return uuid_show_fallback(attr, buffer); 168 ret = sprintf(buffer, "%pU\n", uuid); 169 return ret; 170 } 171 172 HYPERVISOR_ATTR_RO(uuid); 173 174 static int __init xen_sysfs_uuid_init(void) 175 { 176 return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr); 177 } 178 179 /* xen compilation attributes */ 180 181 static ssize_t compiler_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->compiler); 191 kfree(info); 192 } 193 194 return ret; 195 } 196 197 HYPERVISOR_ATTR_RO(compiler); 198 199 static ssize_t compiled_by_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_by); 209 kfree(info); 210 } 211 212 return ret; 213 } 214 215 HYPERVISOR_ATTR_RO(compiled_by); 216 217 static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer) 218 { 219 int ret = -ENOMEM; 220 struct xen_compile_info *info; 221 222 info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL); 223 if (info) { 224 ret = HYPERVISOR_xen_version(XENVER_compile_info, info); 225 if (!ret) 226 ret = sprintf(buffer, "%s\n", info->compile_date); 227 kfree(info); 228 } 229 230 return ret; 231 } 232 233 HYPERVISOR_ATTR_RO(compile_date); 234 235 static struct attribute *xen_compile_attrs[] = { 236 &compiler_attr.attr, 237 &compiled_by_attr.attr, 238 &compile_date_attr.attr, 239 NULL 240 }; 241 242 static const struct attribute_group xen_compilation_group = { 243 .name = "compilation", 244 .attrs = xen_compile_attrs, 245 }; 246 247 static int __init xen_sysfs_compilation_init(void) 248 { 249 return sysfs_create_group(hypervisor_kobj, &xen_compilation_group); 250 } 251 252 /* xen properties info */ 253 254 static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer) 255 { 256 int ret = -ENOMEM; 257 char *caps; 258 259 caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL); 260 if (caps) { 261 ret = HYPERVISOR_xen_version(XENVER_capabilities, caps); 262 if (!ret) 263 ret = sprintf(buffer, "%s\n", caps); 264 kfree(caps); 265 } 266 267 return ret; 268 } 269 270 HYPERVISOR_ATTR_RO(capabilities); 271 272 static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer) 273 { 274 int ret = -ENOMEM; 275 char *cset; 276 277 cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL); 278 if (cset) { 279 ret = HYPERVISOR_xen_version(XENVER_changeset, cset); 280 if (!ret) 281 ret = sprintf(buffer, "%s\n", cset); 282 kfree(cset); 283 } 284 285 return ret; 286 } 287 288 HYPERVISOR_ATTR_RO(changeset); 289 290 static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer) 291 { 292 int ret = -ENOMEM; 293 struct xen_platform_parameters *parms; 294 295 parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL); 296 if (parms) { 297 ret = HYPERVISOR_xen_version(XENVER_platform_parameters, 298 parms); 299 if (!ret) 300 ret = sprintf(buffer, "%"PRI_xen_ulong"\n", 301 parms->virt_start); 302 kfree(parms); 303 } 304 305 return ret; 306 } 307 308 HYPERVISOR_ATTR_RO(virtual_start); 309 310 static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer) 311 { 312 int ret; 313 314 ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL); 315 if (ret > 0) 316 ret = sprintf(buffer, "%x\n", ret); 317 318 return ret; 319 } 320 321 HYPERVISOR_ATTR_RO(pagesize); 322 323 static ssize_t xen_feature_show(int index, char *buffer) 324 { 325 ssize_t ret; 326 struct xen_feature_info info; 327 328 info.submap_idx = index; 329 ret = HYPERVISOR_xen_version(XENVER_get_features, &info); 330 if (!ret) 331 ret = sprintf(buffer, "%08x", info.submap); 332 333 return ret; 334 } 335 336 static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer) 337 { 338 ssize_t len; 339 int i; 340 341 len = 0; 342 for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) { 343 int ret = xen_feature_show(i, buffer + len); 344 if (ret < 0) { 345 if (len == 0) 346 len = ret; 347 break; 348 } 349 len += ret; 350 } 351 if (len > 0) 352 buffer[len++] = '\n'; 353 354 return len; 355 } 356 357 HYPERVISOR_ATTR_RO(features); 358 359 static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer) 360 { 361 ssize_t ret; 362 struct xen_build_id *buildid; 363 364 ret = HYPERVISOR_xen_version(XENVER_build_id, NULL); 365 if (ret < 0) { 366 if (ret == -EPERM) 367 ret = sprintf(buffer, "<denied>"); 368 return ret; 369 } 370 371 buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL); 372 if (!buildid) 373 return -ENOMEM; 374 375 buildid->len = ret; 376 ret = HYPERVISOR_xen_version(XENVER_build_id, buildid); 377 if (ret > 0) 378 ret = sprintf(buffer, "%s", buildid->buf); 379 kfree(buildid); 380 381 return ret; 382 } 383 384 HYPERVISOR_ATTR_RO(buildid); 385 386 static struct attribute *xen_properties_attrs[] = { 387 &capabilities_attr.attr, 388 &changeset_attr.attr, 389 &virtual_start_attr.attr, 390 &pagesize_attr.attr, 391 &features_attr.attr, 392 &buildid_attr.attr, 393 NULL 394 }; 395 396 static const struct attribute_group xen_properties_group = { 397 .name = "properties", 398 .attrs = xen_properties_attrs, 399 }; 400 401 static int __init xen_sysfs_properties_init(void) 402 { 403 return sysfs_create_group(hypervisor_kobj, &xen_properties_group); 404 } 405 406 #ifdef CONFIG_XEN_HAVE_VPMU 407 struct pmu_mode { 408 const char *name; 409 uint32_t mode; 410 }; 411 412 static struct pmu_mode pmu_modes[] = { 413 {"off", XENPMU_MODE_OFF}, 414 {"self", XENPMU_MODE_SELF}, 415 {"hv", XENPMU_MODE_HV}, 416 {"all", XENPMU_MODE_ALL} 417 }; 418 419 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, 420 const char *buffer, size_t len) 421 { 422 int ret; 423 struct xen_pmu_params xp; 424 int i; 425 426 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 427 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { 428 xp.val = pmu_modes[i].mode; 429 break; 430 } 431 } 432 433 if (i == ARRAY_SIZE(pmu_modes)) 434 return -EINVAL; 435 436 xp.version.maj = XENPMU_VER_MAJ; 437 xp.version.min = XENPMU_VER_MIN; 438 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); 439 if (ret) 440 return ret; 441 442 return len; 443 } 444 445 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) 446 { 447 int ret; 448 struct xen_pmu_params xp; 449 int i; 450 uint32_t mode; 451 452 xp.version.maj = XENPMU_VER_MAJ; 453 xp.version.min = XENPMU_VER_MIN; 454 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); 455 if (ret) 456 return ret; 457 458 mode = (uint32_t)xp.val; 459 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 460 if (mode == pmu_modes[i].mode) 461 return sprintf(buffer, "%s\n", pmu_modes[i].name); 462 } 463 464 return -EINVAL; 465 } 466 HYPERVISOR_ATTR_RW(pmu_mode); 467 468 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, 469 const char *buffer, size_t len) 470 { 471 int ret; 472 uint32_t features; 473 struct xen_pmu_params xp; 474 475 ret = kstrtou32(buffer, 0, &features); 476 if (ret) 477 return ret; 478 479 xp.val = features; 480 xp.version.maj = XENPMU_VER_MAJ; 481 xp.version.min = XENPMU_VER_MIN; 482 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); 483 if (ret) 484 return ret; 485 486 return len; 487 } 488 489 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) 490 { 491 int ret; 492 struct xen_pmu_params xp; 493 494 xp.version.maj = XENPMU_VER_MAJ; 495 xp.version.min = XENPMU_VER_MIN; 496 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); 497 if (ret) 498 return ret; 499 500 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); 501 } 502 HYPERVISOR_ATTR_RW(pmu_features); 503 504 static struct attribute *xen_pmu_attrs[] = { 505 &pmu_mode_attr.attr, 506 &pmu_features_attr.attr, 507 NULL 508 }; 509 510 static const struct attribute_group xen_pmu_group = { 511 .name = "pmu", 512 .attrs = xen_pmu_attrs, 513 }; 514 515 static int __init xen_sysfs_pmu_init(void) 516 { 517 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 518 } 519 #endif 520 521 static int __init hyper_sysfs_init(void) 522 { 523 int ret; 524 525 if (!xen_domain()) 526 return -ENODEV; 527 528 ret = xen_sysfs_type_init(); 529 if (ret) 530 goto out; 531 ret = xen_sysfs_guest_type_init(); 532 if (ret) 533 goto guest_type_out; 534 ret = xen_sysfs_version_init(); 535 if (ret) 536 goto version_out; 537 ret = xen_sysfs_compilation_init(); 538 if (ret) 539 goto comp_out; 540 ret = xen_sysfs_uuid_init(); 541 if (ret) 542 goto uuid_out; 543 ret = xen_sysfs_properties_init(); 544 if (ret) 545 goto prop_out; 546 #ifdef CONFIG_XEN_HAVE_VPMU 547 if (xen_initial_domain()) { 548 ret = xen_sysfs_pmu_init(); 549 if (ret) { 550 sysfs_remove_group(hypervisor_kobj, 551 &xen_properties_group); 552 goto prop_out; 553 } 554 } 555 #endif 556 goto out; 557 558 prop_out: 559 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 560 uuid_out: 561 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 562 comp_out: 563 sysfs_remove_group(hypervisor_kobj, &version_group); 564 version_out: 565 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 566 guest_type_out: 567 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 568 out: 569 return ret; 570 } 571 device_initcall(hyper_sysfs_init); 572 573 static ssize_t hyp_sysfs_show(struct kobject *kobj, 574 struct attribute *attr, 575 char *buffer) 576 { 577 struct hyp_sysfs_attr *hyp_attr; 578 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 579 if (hyp_attr->show) 580 return hyp_attr->show(hyp_attr, buffer); 581 return 0; 582 } 583 584 static ssize_t hyp_sysfs_store(struct kobject *kobj, 585 struct attribute *attr, 586 const char *buffer, 587 size_t len) 588 { 589 struct hyp_sysfs_attr *hyp_attr; 590 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 591 if (hyp_attr->store) 592 return hyp_attr->store(hyp_attr, buffer, len); 593 return 0; 594 } 595 596 static const struct sysfs_ops hyp_sysfs_ops = { 597 .show = hyp_sysfs_show, 598 .store = hyp_sysfs_store, 599 }; 600 601 static struct kobj_type hyp_sysfs_kobj_type = { 602 .sysfs_ops = &hyp_sysfs_ops, 603 }; 604 605 static int __init hypervisor_subsys_init(void) 606 { 607 if (!xen_domain()) 608 return -ENODEV; 609 610 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; 611 return 0; 612 } 613 device_initcall(hypervisor_subsys_init); 614