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 struct attribute *xen_properties_attrs[] = { 360 &capabilities_attr.attr, 361 &changeset_attr.attr, 362 &virtual_start_attr.attr, 363 &pagesize_attr.attr, 364 &features_attr.attr, 365 NULL 366 }; 367 368 static const struct attribute_group xen_properties_group = { 369 .name = "properties", 370 .attrs = xen_properties_attrs, 371 }; 372 373 static int __init xen_sysfs_properties_init(void) 374 { 375 return sysfs_create_group(hypervisor_kobj, &xen_properties_group); 376 } 377 378 #ifdef CONFIG_XEN_HAVE_VPMU 379 struct pmu_mode { 380 const char *name; 381 uint32_t mode; 382 }; 383 384 static struct pmu_mode pmu_modes[] = { 385 {"off", XENPMU_MODE_OFF}, 386 {"self", XENPMU_MODE_SELF}, 387 {"hv", XENPMU_MODE_HV}, 388 {"all", XENPMU_MODE_ALL} 389 }; 390 391 static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr, 392 const char *buffer, size_t len) 393 { 394 int ret; 395 struct xen_pmu_params xp; 396 int i; 397 398 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 399 if (strncmp(buffer, pmu_modes[i].name, len - 1) == 0) { 400 xp.val = pmu_modes[i].mode; 401 break; 402 } 403 } 404 405 if (i == ARRAY_SIZE(pmu_modes)) 406 return -EINVAL; 407 408 xp.version.maj = XENPMU_VER_MAJ; 409 xp.version.min = XENPMU_VER_MIN; 410 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp); 411 if (ret) 412 return ret; 413 414 return len; 415 } 416 417 static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer) 418 { 419 int ret; 420 struct xen_pmu_params xp; 421 int i; 422 uint32_t mode; 423 424 xp.version.maj = XENPMU_VER_MAJ; 425 xp.version.min = XENPMU_VER_MIN; 426 ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp); 427 if (ret) 428 return ret; 429 430 mode = (uint32_t)xp.val; 431 for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) { 432 if (mode == pmu_modes[i].mode) 433 return sprintf(buffer, "%s\n", pmu_modes[i].name); 434 } 435 436 return -EINVAL; 437 } 438 HYPERVISOR_ATTR_RW(pmu_mode); 439 440 static ssize_t pmu_features_store(struct hyp_sysfs_attr *attr, 441 const char *buffer, size_t len) 442 { 443 int ret; 444 uint32_t features; 445 struct xen_pmu_params xp; 446 447 ret = kstrtou32(buffer, 0, &features); 448 if (ret) 449 return ret; 450 451 xp.val = features; 452 xp.version.maj = XENPMU_VER_MAJ; 453 xp.version.min = XENPMU_VER_MIN; 454 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_set, &xp); 455 if (ret) 456 return ret; 457 458 return len; 459 } 460 461 static ssize_t pmu_features_show(struct hyp_sysfs_attr *attr, char *buffer) 462 { 463 int ret; 464 struct xen_pmu_params xp; 465 466 xp.version.maj = XENPMU_VER_MAJ; 467 xp.version.min = XENPMU_VER_MIN; 468 ret = HYPERVISOR_xenpmu_op(XENPMU_feature_get, &xp); 469 if (ret) 470 return ret; 471 472 return sprintf(buffer, "0x%x\n", (uint32_t)xp.val); 473 } 474 HYPERVISOR_ATTR_RW(pmu_features); 475 476 static struct attribute *xen_pmu_attrs[] = { 477 &pmu_mode_attr.attr, 478 &pmu_features_attr.attr, 479 NULL 480 }; 481 482 static const struct attribute_group xen_pmu_group = { 483 .name = "pmu", 484 .attrs = xen_pmu_attrs, 485 }; 486 487 static int __init xen_sysfs_pmu_init(void) 488 { 489 return sysfs_create_group(hypervisor_kobj, &xen_pmu_group); 490 } 491 #endif 492 493 static int __init hyper_sysfs_init(void) 494 { 495 int ret; 496 497 if (!xen_domain()) 498 return -ENODEV; 499 500 ret = xen_sysfs_type_init(); 501 if (ret) 502 goto out; 503 ret = xen_sysfs_guest_type_init(); 504 if (ret) 505 goto guest_type_out; 506 ret = xen_sysfs_version_init(); 507 if (ret) 508 goto version_out; 509 ret = xen_sysfs_compilation_init(); 510 if (ret) 511 goto comp_out; 512 ret = xen_sysfs_uuid_init(); 513 if (ret) 514 goto uuid_out; 515 ret = xen_sysfs_properties_init(); 516 if (ret) 517 goto prop_out; 518 #ifdef CONFIG_XEN_HAVE_VPMU 519 if (xen_initial_domain()) { 520 ret = xen_sysfs_pmu_init(); 521 if (ret) { 522 sysfs_remove_group(hypervisor_kobj, 523 &xen_properties_group); 524 goto prop_out; 525 } 526 } 527 #endif 528 goto out; 529 530 prop_out: 531 sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr); 532 uuid_out: 533 sysfs_remove_group(hypervisor_kobj, &xen_compilation_group); 534 comp_out: 535 sysfs_remove_group(hypervisor_kobj, &version_group); 536 version_out: 537 sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr); 538 guest_type_out: 539 sysfs_remove_file(hypervisor_kobj, &type_attr.attr); 540 out: 541 return ret; 542 } 543 device_initcall(hyper_sysfs_init); 544 545 static ssize_t hyp_sysfs_show(struct kobject *kobj, 546 struct attribute *attr, 547 char *buffer) 548 { 549 struct hyp_sysfs_attr *hyp_attr; 550 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 551 if (hyp_attr->show) 552 return hyp_attr->show(hyp_attr, buffer); 553 return 0; 554 } 555 556 static ssize_t hyp_sysfs_store(struct kobject *kobj, 557 struct attribute *attr, 558 const char *buffer, 559 size_t len) 560 { 561 struct hyp_sysfs_attr *hyp_attr; 562 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 563 if (hyp_attr->store) 564 return hyp_attr->store(hyp_attr, buffer, len); 565 return 0; 566 } 567 568 static const struct sysfs_ops hyp_sysfs_ops = { 569 .show = hyp_sysfs_show, 570 .store = hyp_sysfs_store, 571 }; 572 573 static struct kobj_type hyp_sysfs_kobj_type = { 574 .sysfs_ops = &hyp_sysfs_ops, 575 }; 576 577 static int __init hypervisor_subsys_init(void) 578 { 579 if (!xen_domain()) 580 return -ENODEV; 581 582 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; 583 return 0; 584 } 585 device_initcall(hypervisor_subsys_init); 586