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 /* eventually there will be several more features to export */ 297 static ssize_t xen_feature_show(int index, char *buffer) 298 { 299 int ret = -ENOMEM; 300 struct xen_feature_info *info; 301 302 info = kmalloc(sizeof(struct xen_feature_info), GFP_KERNEL); 303 if (info) { 304 info->submap_idx = index; 305 ret = HYPERVISOR_xen_version(XENVER_get_features, info); 306 if (!ret) 307 ret = sprintf(buffer, "%d\n", info->submap); 308 kfree(info); 309 } 310 311 return ret; 312 } 313 314 static ssize_t writable_pt_show(struct hyp_sysfs_attr *attr, char *buffer) 315 { 316 return xen_feature_show(XENFEAT_writable_page_tables, buffer); 317 } 318 319 HYPERVISOR_ATTR_RO(writable_pt); 320 321 static struct attribute *xen_properties_attrs[] = { 322 &capabilities_attr.attr, 323 &changeset_attr.attr, 324 &virtual_start_attr.attr, 325 &pagesize_attr.attr, 326 &writable_pt_attr.attr, 327 NULL 328 }; 329 330 static struct attribute_group xen_properties_group = { 331 .name = "properties", 332 .attrs = xen_properties_attrs, 333 }; 334 335 static int __init xen_properties_init(void) 336 { 337 return sysfs_create_group(hypervisor_kobj, &xen_properties_group); 338 } 339 340 static void xen_properties_destroy(void) 341 { 342 sysfs_remove_group(hypervisor_kobj, &xen_properties_group); 343 } 344 345 #ifdef CONFIG_KEXEC 346 347 extern size_t vmcoreinfo_size_xen; 348 extern unsigned long paddr_vmcoreinfo_xen; 349 350 static ssize_t vmcoreinfo_show(struct hyp_sysfs_attr *attr, char *page) 351 { 352 return sprintf(page, "%lx %zx\n", 353 paddr_vmcoreinfo_xen, vmcoreinfo_size_xen); 354 } 355 356 HYPERVISOR_ATTR_RO(vmcoreinfo); 357 358 static int __init xen_sysfs_vmcoreinfo_init(void) 359 { 360 return sysfs_create_file(hypervisor_kobj, 361 &vmcoreinfo_attr.attr); 362 } 363 364 static void xen_sysfs_vmcoreinfo_destroy(void) 365 { 366 sysfs_remove_file(hypervisor_kobj, &vmcoreinfo_attr.attr); 367 } 368 369 #endif 370 371 static int __init hyper_sysfs_init(void) 372 { 373 int ret; 374 375 if (!xen_domain()) 376 return -ENODEV; 377 378 ret = xen_sysfs_type_init(); 379 if (ret) 380 goto out; 381 ret = xen_sysfs_version_init(); 382 if (ret) 383 goto version_out; 384 ret = xen_compilation_init(); 385 if (ret) 386 goto comp_out; 387 ret = xen_sysfs_uuid_init(); 388 if (ret) 389 goto uuid_out; 390 ret = xen_properties_init(); 391 if (ret) 392 goto prop_out; 393 #ifdef CONFIG_KEXEC 394 if (vmcoreinfo_size_xen != 0) { 395 ret = xen_sysfs_vmcoreinfo_init(); 396 if (ret) 397 goto vmcoreinfo_out; 398 } 399 #endif 400 401 goto out; 402 403 #ifdef CONFIG_KEXEC 404 vmcoreinfo_out: 405 #endif 406 xen_properties_destroy(); 407 prop_out: 408 xen_sysfs_uuid_destroy(); 409 uuid_out: 410 xen_compilation_destroy(); 411 comp_out: 412 xen_sysfs_version_destroy(); 413 version_out: 414 xen_sysfs_type_destroy(); 415 out: 416 return ret; 417 } 418 419 static void __exit hyper_sysfs_exit(void) 420 { 421 #ifdef CONFIG_KEXEC 422 if (vmcoreinfo_size_xen != 0) 423 xen_sysfs_vmcoreinfo_destroy(); 424 #endif 425 xen_properties_destroy(); 426 xen_compilation_destroy(); 427 xen_sysfs_uuid_destroy(); 428 xen_sysfs_version_destroy(); 429 xen_sysfs_type_destroy(); 430 431 } 432 module_init(hyper_sysfs_init); 433 module_exit(hyper_sysfs_exit); 434 435 static ssize_t hyp_sysfs_show(struct kobject *kobj, 436 struct attribute *attr, 437 char *buffer) 438 { 439 struct hyp_sysfs_attr *hyp_attr; 440 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 441 if (hyp_attr->show) 442 return hyp_attr->show(hyp_attr, buffer); 443 return 0; 444 } 445 446 static ssize_t hyp_sysfs_store(struct kobject *kobj, 447 struct attribute *attr, 448 const char *buffer, 449 size_t len) 450 { 451 struct hyp_sysfs_attr *hyp_attr; 452 hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr); 453 if (hyp_attr->store) 454 return hyp_attr->store(hyp_attr, buffer, len); 455 return 0; 456 } 457 458 static struct sysfs_ops hyp_sysfs_ops = { 459 .show = hyp_sysfs_show, 460 .store = hyp_sysfs_store, 461 }; 462 463 static struct kobj_type hyp_sysfs_kobj_type = { 464 .sysfs_ops = &hyp_sysfs_ops, 465 }; 466 467 static int __init hypervisor_subsys_init(void) 468 { 469 if (!xen_domain()) 470 return -ENODEV; 471 472 hypervisor_kobj->ktype = &hyp_sysfs_kobj_type; 473 return 0; 474 } 475 device_initcall(hypervisor_subsys_init); 476