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); 459