Blame view
drivers/firmware/efivars.c
26.6 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 |
/* * EFI Variables - efivars.c * * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> * * This code takes all variables accessible from EFI runtime and * exports them via sysfs * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Changelog: * * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> * remove check for efi_enabled in exit * add MODULE_VERSION * * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> * minor bug fixes * * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) * converted driver to export variable information via sysfs * and moved to drivers/firmware directory * bumped revision number to v0.07 to reflect conversion & move * * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> * fix locking per Peter Chubb's findings * * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() * * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> * use list_for_each_safe when deleting vars. * remove ifdef CONFIG_SMP around include <linux/smp.h> * v0.04 release to linux-ia64@linuxia64.org * * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> * Moved vars from /proc/efi to /proc/efi/vars, and made * efi.c own the /proc/efi directory. * v0.03 release to linux-ia64@linuxia64.org * * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> * At the request of Stephane, moved ownership of /proc/efi * to efi.c, and now efivars lives under /proc/efi/vars. * * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> * Feedback received from Stephane Eranian incorporated. * efivar_write() checks copy_from_user() return value. * efivar_read/write() returns proper errno. * v0.02 release to linux-ia64@linuxia64.org * * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> * v0.01 release to linux-ia64@linuxia64.org */ |
c59ede7b7 [PATCH] move capa... |
67 |
#include <linux/capability.h> |
1da177e4c Linux-2.6.12-rc2 |
68 69 70 |
#include <linux/types.h> #include <linux/errno.h> #include <linux/init.h> |
1da177e4c Linux-2.6.12-rc2 |
71 72 73 74 75 76 77 78 |
#include <linux/mm.h> #include <linux/module.h> #include <linux/string.h> #include <linux/smp.h> #include <linux/efi.h> #include <linux/sysfs.h> #include <linux/kobject.h> #include <linux/device.h> |
5a0e3ad6a include cleanup: ... |
79 |
#include <linux/slab.h> |
5ee9c198a efi: Add support ... |
80 |
#include <linux/pstore.h> |
1da177e4c Linux-2.6.12-rc2 |
81 82 83 84 85 86 87 88 89 90 |
#include <asm/uaccess.h> #define EFIVARS_VERSION "0.08" #define EFIVARS_DATE "2004-May-17" MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); MODULE_DESCRIPTION("sysfs interface to EFI Variables"); MODULE_LICENSE("GPL"); MODULE_VERSION(EFIVARS_VERSION); |
5ee9c198a efi: Add support ... |
91 |
#define DUMP_NAME_LEN 52 |
1da177e4c Linux-2.6.12-rc2 |
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 |
/* * The maximum size of VariableName + Data = 1024 * Therefore, it's reasonable to save that much * space in each part of the structure, * and we use a page for reading/writing. */ struct efi_variable { efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; efi_guid_t VendorGuid; unsigned long DataSize; __u8 Data[1024]; efi_status_t Status; __u32 Attributes; } __attribute__((packed)); struct efivar_entry { |
4142ef146 efivars: paramete... |
110 |
struct efivars *efivars; |
1da177e4c Linux-2.6.12-rc2 |
111 112 113 114 |
struct efi_variable var; struct list_head list; struct kobject kobj; }; |
1da177e4c Linux-2.6.12-rc2 |
115 116 117 118 119 |
struct efivar_attribute { struct attribute attr; ssize_t (*show) (struct efivar_entry *entry, char *buf); ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); }; |
7644c16c7 efivars: Introduc... |
120 121 122 123 |
#define PSTORE_EFI_ATTRIBUTES \ (EFI_VARIABLE_NON_VOLATILE | \ EFI_VARIABLE_BOOTSERVICE_ACCESS | \ EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4c Linux-2.6.12-rc2 |
124 |
|
1da177e4c Linux-2.6.12-rc2 |
125 126 |
#define EFIVAR_ATTR(_name, _mode, _show, _store) \ struct efivar_attribute efivar_attr_##_name = { \ |
7b595756e sysfs: kill unnec... |
127 |
.attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4c Linux-2.6.12-rc2 |
128 129 130 |
.show = _show, \ .store = _store, \ }; |
1da177e4c Linux-2.6.12-rc2 |
131 132 133 134 135 136 137 |
#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) /* * Prototype for sysfs creation function */ static int |
4142ef146 efivars: paramete... |
138 139 140 141 |
efivar_create_sysfs_entry(struct efivars *efivars, unsigned long variable_name_size, efi_char16_t *variable_name, efi_guid_t *vendor_guid); |
1da177e4c Linux-2.6.12-rc2 |
142 143 144 |
/* Return the number of unicode characters in data */ static unsigned long |
a29409083 efivars: String f... |
145 |
utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4c Linux-2.6.12-rc2 |
146 147 |
{ unsigned long length = 0; |
a29409083 efivars: String f... |
148 |
while (*s++ != 0 && length < maxlength) |
1da177e4c Linux-2.6.12-rc2 |
149 150 151 |
length++; return length; } |
b728a5c80 efivars: fix warn... |
152 |
static inline unsigned long |
a29409083 efivars: String f... |
153 154 155 156 |
utf16_strlen(efi_char16_t *s) { return utf16_strnlen(s, ~0UL); } |
1da177e4c Linux-2.6.12-rc2 |
157 158 159 160 161 |
/* * Return the number of bytes is the length of this string * Note: this is NOT the same as the number of unicode characters */ static inline unsigned long |
a29409083 efivars: String f... |
162 |
utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4c Linux-2.6.12-rc2 |
163 |
{ |
a29409083 efivars: String f... |
164 |
return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4c Linux-2.6.12-rc2 |
165 |
} |
828aa1f00 efivars: introduc... |
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 |
static inline int utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) { while (1) { if (len == 0) return 0; if (*a < *b) return -1; if (*a > *b) return 1; if (*a == 0) /* implies *b == 0 */ return 0; a++; b++; len--; } } |
1da177e4c Linux-2.6.12-rc2 |
183 |
static efi_status_t |
5ee9c198a efi: Add support ... |
184 |
get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4c Linux-2.6.12-rc2 |
185 186 |
{ efi_status_t status; |
1da177e4c Linux-2.6.12-rc2 |
187 |
var->DataSize = 1024; |
3295814d8 efivars: Paramete... |
188 189 190 191 192 |
status = efivars->ops->get_variable(var->VariableName, &var->VendorGuid, &var->Attributes, &var->DataSize, var->Data); |
5ee9c198a efi: Add support ... |
193 194 195 196 197 198 199 200 201 202 |
return status; } static efi_status_t get_var_data(struct efivars *efivars, struct efi_variable *var) { efi_status_t status; spin_lock(&efivars->lock); status = get_var_data_locked(efivars, var); |
29422693c efivars: move efi... |
203 |
spin_unlock(&efivars->lock); |
5ee9c198a efi: Add support ... |
204 |
|
1da177e4c Linux-2.6.12-rc2 |
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 |
if (status != EFI_SUCCESS) { printk(KERN_WARNING "efivars: get_variable() failed 0x%lx! ", status); } return status; } static ssize_t efivar_guid_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; char *str = buf; if (!entry || !buf) return 0; efi_guid_unparse(&var->VendorGuid, str); str += strlen(str); str += sprintf(str, " "); return str - buf; } static ssize_t efivar_attr_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; char *str = buf; efi_status_t status; if (!entry || !buf) return -EINVAL; |
4142ef146 efivars: paramete... |
239 |
status = get_var_data(entry->efivars, var); |
1da177e4c Linux-2.6.12-rc2 |
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 |
if (status != EFI_SUCCESS) return -EIO; if (var->Attributes & 0x1) str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE "); if (var->Attributes & 0x2) str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS "); if (var->Attributes & 0x4) str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS "); return str - buf; } static ssize_t efivar_size_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; char *str = buf; efi_status_t status; if (!entry || !buf) return -EINVAL; |
4142ef146 efivars: paramete... |
264 |
status = get_var_data(entry->efivars, var); |
1da177e4c Linux-2.6.12-rc2 |
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 |
if (status != EFI_SUCCESS) return -EIO; str += sprintf(str, "0x%lx ", var->DataSize); return str - buf; } static ssize_t efivar_data_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; efi_status_t status; if (!entry || !buf) return -EINVAL; |
4142ef146 efivars: paramete... |
281 |
status = get_var_data(entry->efivars, var); |
1da177e4c Linux-2.6.12-rc2 |
282 283 284 285 286 287 288 289 290 291 292 293 294 295 |
if (status != EFI_SUCCESS) return -EIO; memcpy(buf, var->Data, var->DataSize); return var->DataSize; } /* * We allow each variable to be edited via rewriting the * entire efi variable structure. */ static ssize_t efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) { struct efi_variable *new_var, *var = &entry->var; |
4142ef146 efivars: paramete... |
296 |
struct efivars *efivars = entry->efivars; |
1da177e4c Linux-2.6.12-rc2 |
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 |
efi_status_t status = EFI_NOT_FOUND; if (count != sizeof(struct efi_variable)) return -EINVAL; new_var = (struct efi_variable *)buf; /* * If only updating the variable data, then the name * and guid should remain the same */ if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { printk(KERN_ERR "efivars: Cannot edit the wrong variable! "); return -EINVAL; } if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ printk(KERN_ERR "efivars: DataSize & Attributes must be valid! "); return -EINVAL; } |
29422693c efivars: move efi... |
319 |
spin_lock(&efivars->lock); |
3295814d8 efivars: Paramete... |
320 321 322 323 324 |
status = efivars->ops->set_variable(new_var->VariableName, &new_var->VendorGuid, new_var->Attributes, new_var->DataSize, new_var->Data); |
1da177e4c Linux-2.6.12-rc2 |
325 |
|
29422693c efivars: move efi... |
326 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 |
if (status != EFI_SUCCESS) { printk(KERN_WARNING "efivars: set_variable() failed: status=%lx ", status); return -EIO; } memcpy(&entry->var, new_var, count); return count; } static ssize_t efivar_show_raw(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; efi_status_t status; if (!entry || !buf) return 0; |
4142ef146 efivars: paramete... |
347 |
status = get_var_data(entry->efivars, var); |
1da177e4c Linux-2.6.12-rc2 |
348 349 350 351 352 353 354 355 356 |
if (status != EFI_SUCCESS) return -EIO; memcpy(buf, var, sizeof(*var)); return sizeof(*var); } /* * Generic read/write functions that call the specific functions of |
70f23fd66 treewide: fix a f... |
357 |
* the attributes... |
1da177e4c Linux-2.6.12-rc2 |
358 359 360 361 362 363 |
*/ static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct efivar_entry *var = to_efivar_entry(kobj); struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
70f2817a4 [PATCH] sysfs: (r... |
364 |
ssize_t ret = -EIO; |
1da177e4c Linux-2.6.12-rc2 |
365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 |
if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (efivar_attr->show) { ret = efivar_attr->show(var, buf); } return ret; } static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) { struct efivar_entry *var = to_efivar_entry(kobj); struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
70f2817a4 [PATCH] sysfs: (r... |
380 |
ssize_t ret = -EIO; |
1da177e4c Linux-2.6.12-rc2 |
381 382 383 384 385 386 387 388 389 |
if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (efivar_attr->store) ret = efivar_attr->store(var, buf, count); return ret; } |
52cf25d0a Driver core: Cons... |
390 |
static const struct sysfs_ops efivar_attr_ops = { |
1da177e4c Linux-2.6.12-rc2 |
391 392 393 394 395 396 397 |
.show = efivar_attr_show, .store = efivar_attr_store, }; static void efivar_release(struct kobject *kobj) { struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); |
1da177e4c Linux-2.6.12-rc2 |
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 |
kfree(var); } static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); static struct attribute *def_attrs[] = { &efivar_attr_guid.attr, &efivar_attr_size.attr, &efivar_attr_attributes.attr, &efivar_attr_data.attr, &efivar_attr_raw_var.attr, NULL, }; |
e89a4116e Driver core: rena... |
415 |
static struct kobj_type efivar_ktype = { |
1da177e4c Linux-2.6.12-rc2 |
416 417 418 419 |
.release = efivar_release, .sysfs_ops = &efivar_attr_ops, .default_attrs = def_attrs, }; |
5ee9c198a efi: Add support ... |
420 |
static struct pstore_info efi_pstore_info; |
1da177e4c Linux-2.6.12-rc2 |
421 422 423 |
static inline void efivar_unregister(struct efivar_entry *var) { |
c10997f65 Kobject: convert ... |
424 |
kobject_put(&var->kobj); |
1da177e4c Linux-2.6.12-rc2 |
425 |
} |
5ee9c198a efi: Add support ... |
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 |
#ifdef CONFIG_PSTORE static int efi_pstore_open(struct pstore_info *psi) { struct efivars *efivars = psi->data; spin_lock(&efivars->lock); efivars->walk_entry = list_first_entry(&efivars->list, struct efivar_entry, list); return 0; } static int efi_pstore_close(struct pstore_info *psi) { struct efivars *efivars = psi->data; spin_unlock(&efivars->lock); return 0; } static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
f6f828513 pstore: pass allo... |
447 448 |
struct timespec *timespec, char **buf, struct pstore_info *psi) |
5ee9c198a efi: Add support ... |
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 |
{ efi_guid_t vendor = LINUX_EFI_CRASH_GUID; struct efivars *efivars = psi->data; char name[DUMP_NAME_LEN]; int i; unsigned int part, size; unsigned long time; while (&efivars->walk_entry->list != &efivars->list) { if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, vendor)) { for (i = 0; i < DUMP_NAME_LEN; i++) { name[i] = efivars->walk_entry->var.VariableName[i]; } if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { *id = part; timespec->tv_sec = time; timespec->tv_nsec = 0; get_var_data_locked(efivars, &efivars->walk_entry->var); size = efivars->walk_entry->var.DataSize; |
f6f828513 pstore: pass allo... |
469 470 471 472 473 |
*buf = kmalloc(size, GFP_KERNEL); if (*buf == NULL) return -ENOMEM; memcpy(*buf, efivars->walk_entry->var.Data, size); |
5ee9c198a efi: Add support ... |
474 475 476 477 478 479 480 481 482 483 |
efivars->walk_entry = list_entry(efivars->walk_entry->list.next, struct efivar_entry, list); return size; } } efivars->walk_entry = list_entry(efivars->walk_entry->list.next, struct efivar_entry, list); } return 0; } |
3d6d8d20e pstore: pass reas... |
484 485 |
static int efi_pstore_write(enum pstore_type_id type, enum kmsg_dump_reason reason, u64 *id, |
b238b8fa9 pstore: make psto... |
486 |
unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198a efi: Add support ... |
487 488 489 490 491 492 493 |
{ char name[DUMP_NAME_LEN]; char stub_name[DUMP_NAME_LEN]; efi_char16_t efi_name[DUMP_NAME_LEN]; efi_guid_t vendor = LINUX_EFI_CRASH_GUID; struct efivars *efivars = psi->data; struct efivar_entry *entry, *found = NULL; |
b238b8fa9 pstore: make psto... |
494 |
int i, ret = 0; |
5ee9c198a efi: Add support ... |
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 |
sprintf(stub_name, "dump-type%u-%u-", type, part); sprintf(name, "%s%lu", stub_name, get_seconds()); spin_lock(&efivars->lock); for (i = 0; i < DUMP_NAME_LEN; i++) efi_name[i] = stub_name[i]; /* * Clean up any entries with the same name */ list_for_each_entry(entry, &efivars->list, list) { get_var_data_locked(efivars, &entry->var); |
c475594d8 efivars: Use stri... |
510 511 512 513 514 515 516 517 518 519 520 |
if (efi_guidcmp(entry->var.VendorGuid, vendor)) continue; if (utf16_strncmp(entry->var.VariableName, efi_name, utf16_strlen(efi_name))) continue; /* Needs to be a prefix */ if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) continue; /* found */ found = entry; |
7644c16c7 efivars: Introduc... |
521 522 523 |
efivars->ops->set_variable(entry->var.VariableName, &entry->var.VendorGuid, PSTORE_EFI_ATTRIBUTES, |
c475594d8 efivars: Use stri... |
524 |
0, NULL); |
5ee9c198a efi: Add support ... |
525 526 527 528 529 530 531 |
} if (found) list_del(&found->list); for (i = 0; i < DUMP_NAME_LEN; i++) efi_name[i] = name[i]; |
7644c16c7 efivars: Introduc... |
532 |
efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198a efi: Add support ... |
533 534 535 536 537 538 539 540 |
size, psi->buf); spin_unlock(&efivars->lock); if (found) efivar_unregister(found); if (size) |
b238b8fa9 pstore: make psto... |
541 |
ret = efivar_create_sysfs_entry(efivars, |
a29409083 efivars: String f... |
542 543 |
utf16_strsize(efi_name, DUMP_NAME_LEN * 2), |
5ee9c198a efi: Add support ... |
544 |
efi_name, &vendor); |
b238b8fa9 pstore: make psto... |
545 546 |
*id = part; return ret; |
5ee9c198a efi: Add support ... |
547 548 549 550 551 |
}; static int efi_pstore_erase(enum pstore_type_id type, u64 id, struct pstore_info *psi) { |
3d6d8d20e pstore: pass reas... |
552 |
efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
5ee9c198a efi: Add support ... |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 |
return 0; } #else static int efi_pstore_open(struct pstore_info *psi) { return 0; } static int efi_pstore_close(struct pstore_info *psi) { return 0; } static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
eee628da2 efivars: add miss... |
568 569 |
struct timespec *timespec, char **buf, struct pstore_info *psi) |
5ee9c198a efi: Add support ... |
570 571 572 |
{ return -1; } |
3d6d8d20e pstore: pass reas... |
573 574 |
static int efi_pstore_write(enum pstore_type_id type, enum kmsg_dump_reason reason, u64 *id, |
b238b8fa9 pstore: make psto... |
575 |
unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198a efi: Add support ... |
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 |
{ return 0; } static int efi_pstore_erase(enum pstore_type_id type, u64 id, struct pstore_info *psi) { return 0; } #endif static struct pstore_info efi_pstore_info = { .owner = THIS_MODULE, .name = "efi", .open = efi_pstore_open, .close = efi_pstore_close, .read = efi_pstore_read, .write = efi_pstore_write, .erase = efi_pstore_erase, }; |
1da177e4c Linux-2.6.12-rc2 |
596 |
|
2c3c8bea6 sysfs: add struct... |
597 |
static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb74 efivars: make new... |
598 599 |
struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) |
1da177e4c Linux-2.6.12-rc2 |
600 601 |
{ struct efi_variable *new_var = (struct efi_variable *)buf; |
4142ef146 efivars: paramete... |
602 |
struct efivars *efivars = bin_attr->private; |
496a0fc8c [PATCH] Fix race ... |
603 |
struct efivar_entry *search_efivar, *n; |
1da177e4c Linux-2.6.12-rc2 |
604 |
unsigned long strsize1, strsize2; |
1da177e4c Linux-2.6.12-rc2 |
605 606 607 608 609 |
efi_status_t status = EFI_NOT_FOUND; int found = 0; if (!capable(CAP_SYS_ADMIN)) return -EACCES; |
29422693c efivars: move efi... |
610 |
spin_lock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
611 612 613 614 |
/* * Does this variable already exist? */ |
29422693c efivars: move efi... |
615 |
list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a29409083 efivars: String f... |
616 617 |
strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); strsize2 = utf16_strsize(new_var->VariableName, 1024); |
1da177e4c Linux-2.6.12-rc2 |
618 619 620 621 622 623 624 625 626 627 |
if (strsize1 == strsize2 && !memcmp(&(search_efivar->var.VariableName), new_var->VariableName, strsize1) && !efi_guidcmp(search_efivar->var.VendorGuid, new_var->VendorGuid)) { found = 1; break; } } if (found) { |
29422693c efivars: move efi... |
628 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 |
return -EINVAL; } /* now *really* create the variable via EFI */ |
3295814d8 efivars: Paramete... |
633 634 635 636 637 |
status = efivars->ops->set_variable(new_var->VariableName, &new_var->VendorGuid, new_var->Attributes, new_var->DataSize, new_var->Data); |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 |
if (status != EFI_SUCCESS) { printk(KERN_WARNING "efivars: set_variable() failed: status=%lx ", status); |
29422693c efivars: move efi... |
643 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
644 645 |
return -EIO; } |
29422693c efivars: move efi... |
646 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
647 648 |
/* Create the entry in sysfs. Locking is not required here */ |
4142ef146 efivars: paramete... |
649 |
status = efivar_create_sysfs_entry(efivars, |
a29409083 efivars: String f... |
650 651 |
utf16_strsize(new_var->VariableName, 1024), |
4142ef146 efivars: paramete... |
652 653 |
new_var->VariableName, &new_var->VendorGuid); |
1da177e4c Linux-2.6.12-rc2 |
654 655 656 657 658 659 |
if (status) { printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't. "); } return count; } |
2c3c8bea6 sysfs: add struct... |
660 |
static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb74 efivars: make new... |
661 662 |
struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) |
1da177e4c Linux-2.6.12-rc2 |
663 664 |
{ struct efi_variable *del_var = (struct efi_variable *)buf; |
4142ef146 efivars: paramete... |
665 |
struct efivars *efivars = bin_attr->private; |
496a0fc8c [PATCH] Fix race ... |
666 |
struct efivar_entry *search_efivar, *n; |
1da177e4c Linux-2.6.12-rc2 |
667 |
unsigned long strsize1, strsize2; |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 |
efi_status_t status = EFI_NOT_FOUND; int found = 0; if (!capable(CAP_SYS_ADMIN)) return -EACCES; |
29422693c efivars: move efi... |
673 |
spin_lock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 |
/* * Does this variable already exist? */ |
29422693c efivars: move efi... |
678 |
list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a29409083 efivars: String f... |
679 680 |
strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); strsize2 = utf16_strsize(del_var->VariableName, 1024); |
1da177e4c Linux-2.6.12-rc2 |
681 682 683 684 685 686 687 688 689 690 |
if (strsize1 == strsize2 && !memcmp(&(search_efivar->var.VariableName), del_var->VariableName, strsize1) && !efi_guidcmp(search_efivar->var.VendorGuid, del_var->VendorGuid)) { found = 1; break; } } if (!found) { |
29422693c efivars: move efi... |
691 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 695 696 |
return -EINVAL; } /* force the Attributes/DataSize to 0 to ensure deletion */ del_var->Attributes = 0; del_var->DataSize = 0; |
3295814d8 efivars: Paramete... |
697 698 699 700 701 |
status = efivars->ops->set_variable(del_var->VariableName, &del_var->VendorGuid, del_var->Attributes, del_var->DataSize, del_var->Data); |
1da177e4c Linux-2.6.12-rc2 |
702 703 704 705 706 |
if (status != EFI_SUCCESS) { printk(KERN_WARNING "efivars: set_variable() failed: status=%lx ", status); |
29422693c efivars: move efi... |
707 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
708 709 |
return -EIO; } |
496a0fc8c [PATCH] Fix race ... |
710 |
list_del(&search_efivar->list); |
1da177e4c Linux-2.6.12-rc2 |
711 |
/* We need to release this lock before unregistering. */ |
29422693c efivars: move efi... |
712 |
spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
713 714 715 716 717 |
efivar_unregister(search_efivar); /* It's dead Jim.... */ return count; } |
1da177e4c Linux-2.6.12-rc2 |
718 719 720 721 |
/* * Let's not leave out systab information that snuck into * the efivars driver */ |
334c63075 kobject: convert ... |
722 723 |
static ssize_t systab_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
1da177e4c Linux-2.6.12-rc2 |
724 725 |
{ char *str = buf; |
334c63075 kobject: convert ... |
726 |
if (!kobj || !buf) |
1da177e4c Linux-2.6.12-rc2 |
727 |
return -EINVAL; |
b2c99e3c7 [PATCH] EFI: keep... |
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 |
if (efi.mps != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "MPS=0x%lx ", efi.mps); if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "ACPI20=0x%lx ", efi.acpi20); if (efi.acpi != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "ACPI=0x%lx ", efi.acpi); if (efi.smbios != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "SMBIOS=0x%lx ", efi.smbios); if (efi.hcdp != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "HCDP=0x%lx ", efi.hcdp); if (efi.boot_info != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "BOOTINFO=0x%lx ", efi.boot_info); if (efi.uga != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "UGA=0x%lx ", efi.uga); |
1da177e4c Linux-2.6.12-rc2 |
749 750 751 |
return str - buf; } |
334c63075 kobject: convert ... |
752 753 |
static struct kobj_attribute efi_attr_systab = __ATTR(systab, 0400, systab_show, NULL); |
1da177e4c Linux-2.6.12-rc2 |
754 |
|
334c63075 kobject: convert ... |
755 756 |
static struct attribute *efi_subsys_attrs[] = { &efi_attr_systab.attr, |
1da177e4c Linux-2.6.12-rc2 |
757 758 |
NULL, /* maybe more in the future? */ }; |
334c63075 kobject: convert ... |
759 760 761 |
static struct attribute_group efi_subsys_attr_group = { .attrs = efi_subsys_attrs, }; |
bc87d2fe7 kobject: convert ... |
762 |
static struct kobject *efi_kobj; |
1da177e4c Linux-2.6.12-rc2 |
763 764 765 766 767 768 769 |
/* * efivar_create_sysfs_entry() * Requires: * variable_name_size = number of bytes required to hold * variable_name (not counting the NULL * character at the end. |
29422693c efivars: move efi... |
770 |
* efivars->lock is not held on entry or exit. |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 |
* Returns 1 on failure, 0 on success */ static int |
4142ef146 efivars: paramete... |
774 775 776 777 |
efivar_create_sysfs_entry(struct efivars *efivars, unsigned long variable_name_size, efi_char16_t *variable_name, efi_guid_t *vendor_guid) |
1da177e4c Linux-2.6.12-rc2 |
778 779 780 781 |
{ int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; char *short_name; struct efivar_entry *new_efivar; |
9c2153844 [PATCH] drivers/f... |
782 783 |
short_name = kzalloc(short_name_size + 1, GFP_KERNEL); new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
784 785 |
if (!short_name || !new_efivar) { |
0933ad9c2 [PATCH] kfree cle... |
786 787 |
kfree(short_name); kfree(new_efivar); |
1da177e4c Linux-2.6.12-rc2 |
788 789 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
790 |
|
4142ef146 efivars: paramete... |
791 |
new_efivar->efivars = efivars; |
1da177e4c Linux-2.6.12-rc2 |
792 793 794 795 796 797 798 799 800 801 802 803 804 805 |
memcpy(new_efivar->var.VariableName, variable_name, variable_name_size); memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); /* Convert Unicode to normal chars (assume top bits are 0), ala UTF-8 */ for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { short_name[i] = variable_name[i] & 0xFF; } /* This is ugly, but necessary to separate one vendor's private variables from another's. */ *(short_name + strlen(short_name)) = '-'; efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); |
29422693c efivars: move efi... |
806 |
new_efivar->kobj.kset = efivars->kset; |
d6d292c45 Kobject: change d... |
807 808 |
i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, "%s", short_name); |
69b2186c5 [PATCH] firmware/... |
809 810 811 812 813 |
if (i) { kfree(short_name); kfree(new_efivar); return 1; } |
1da177e4c Linux-2.6.12-rc2 |
814 |
|
d6d292c45 Kobject: change d... |
815 |
kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c2 [PATCH] kfree cle... |
816 817 |
kfree(short_name); short_name = NULL; |
1da177e4c Linux-2.6.12-rc2 |
818 |
|
29422693c efivars: move efi... |
819 820 821 |
spin_lock(&efivars->lock); list_add(&new_efivar->list, &efivars->list); spin_unlock(&efivars->lock); |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 |
return 0; } |
d502fbb0d efivars: Make efi... |
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 |
static int create_efivars_bin_attributes(struct efivars *efivars) { struct bin_attribute *attr; int error; /* new_var */ attr = kzalloc(sizeof(*attr), GFP_KERNEL); if (!attr) return -ENOMEM; attr->attr.name = "new_var"; attr->attr.mode = 0200; attr->write = efivar_create; attr->private = efivars; efivars->new_var = attr; /* del_var */ attr = kzalloc(sizeof(*attr), GFP_KERNEL); if (!attr) { error = -ENOMEM; goto out_free; } attr->attr.name = "del_var"; attr->attr.mode = 0200; attr->write = efivar_delete; attr->private = efivars; efivars->del_var = attr; sysfs_bin_attr_init(efivars->new_var); sysfs_bin_attr_init(efivars->del_var); /* Register */ error = sysfs_create_bin_file(&efivars->kset->kobj, efivars->new_var); if (error) { printk(KERN_ERR "efivars: unable to create new_var sysfs file" " due to error %d ", error); goto out_free; } error = sysfs_create_bin_file(&efivars->kset->kobj, efivars->del_var); if (error) { printk(KERN_ERR "efivars: unable to create del_var sysfs file" " due to error %d ", error); sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); goto out_free; } return 0; out_free: |
051d51bc6 efivars: memory l... |
880 881 |
kfree(efivars->del_var); efivars->del_var = NULL; |
d502fbb0d efivars: Make efi... |
882 883 884 885 |
kfree(efivars->new_var); efivars->new_var = NULL; return error; } |
4fc756bd9 efivars: Expose e... |
886 |
void unregister_efivars(struct efivars *efivars) |
76b53f7c8 efivars: Split ou... |
887 888 |
{ struct efivar_entry *entry, *n; |
4142ef146 efivars: paramete... |
889 |
|
76b53f7c8 efivars: Split ou... |
890 891 892 893 894 895 896 897 898 899 900 901 902 903 |
list_for_each_entry_safe(entry, n, &efivars->list, list) { spin_lock(&efivars->lock); list_del(&entry->list); spin_unlock(&efivars->lock); efivar_unregister(entry); } if (efivars->new_var) sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); if (efivars->del_var) sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); kfree(efivars->new_var); kfree(efivars->del_var); kset_unregister(efivars->kset); } |
4fc756bd9 efivars: Expose e... |
904 |
EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4c Linux-2.6.12-rc2 |
905 |
|
4fc756bd9 efivars: Expose e... |
906 907 908 |
int register_efivars(struct efivars *efivars, const struct efivar_operations *ops, struct kobject *parent_kobj) |
1da177e4c Linux-2.6.12-rc2 |
909 910 911 912 |
{ efi_status_t status = EFI_NOT_FOUND; efi_guid_t vendor_guid; efi_char16_t *variable_name; |
1da177e4c Linux-2.6.12-rc2 |
913 |
unsigned long variable_name_size = 1024; |
334c63075 kobject: convert ... |
914 |
int error = 0; |
1da177e4c Linux-2.6.12-rc2 |
915 |
|
9c2153844 [PATCH] drivers/f... |
916 |
variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
917 918 919 920 921 |
if (!variable_name) { printk(KERN_ERR "efivars: Memory allocation failed. "); return -ENOMEM; } |
29422693c efivars: move efi... |
922 923 |
spin_lock_init(&efivars->lock); INIT_LIST_HEAD(&efivars->list); |
3295814d8 efivars: Paramete... |
924 |
efivars->ops = ops; |
29422693c efivars: move efi... |
925 |
|
76b53f7c8 efivars: Split ou... |
926 |
efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693c efivars: move efi... |
927 |
if (!efivars->kset) { |
66ac831e0 kset: convert efi... |
928 929 930 |
printk(KERN_ERR "efivars: Subsystem registration failed. "); error = -ENOMEM; |
76b53f7c8 efivars: Split ou... |
931 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 935 936 937 938 939 940 |
} /* * Per EFI spec, the maximum storage allocated for both * the variable name and variable data is 1024 bytes. */ do { variable_name_size = 1024; |
3295814d8 efivars: Paramete... |
941 |
status = ops->get_next_variable(&variable_name_size, |
1da177e4c Linux-2.6.12-rc2 |
942 943 944 945 |
variable_name, &vendor_guid); switch (status) { case EFI_SUCCESS: |
4142ef146 efivars: paramete... |
946 947 948 949 |
efivar_create_sysfs_entry(efivars, variable_name_size, variable_name, &vendor_guid); |
1da177e4c Linux-2.6.12-rc2 |
950 951 952 953 954 955 956 957 958 959 960 |
break; case EFI_NOT_FOUND: break; default: printk(KERN_WARNING "efivars: get_next_variable: status=%lx ", status); status = EFI_NOT_FOUND; break; } } while (status != EFI_NOT_FOUND); |
d502fbb0d efivars: Make efi... |
961 |
error = create_efivars_bin_attributes(efivars); |
1da177e4c Linux-2.6.12-rc2 |
962 |
if (error) |
76b53f7c8 efivars: Split ou... |
963 |
unregister_efivars(efivars); |
1da177e4c Linux-2.6.12-rc2 |
964 |
|
5ee9c198a efi: Add support ... |
965 966 967 968 969 970 |
efivars->efi_pstore_info = efi_pstore_info; efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); if (efivars->efi_pstore_info.buf) { efivars->efi_pstore_info.bufsize = 1024; efivars->efi_pstore_info.data = efivars; |
abd4d5587 pstore: change mu... |
971 |
spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198a efi: Add support ... |
972 973 |
pstore_register(&efivars->efi_pstore_info); } |
76b53f7c8 efivars: Split ou... |
974 975 |
out: kfree(variable_name); |
1da177e4c Linux-2.6.12-rc2 |
976 |
|
76b53f7c8 efivars: Split ou... |
977 978 |
return error; } |
4fc756bd9 efivars: Expose e... |
979 |
EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4c Linux-2.6.12-rc2 |
980 |
|
76b53f7c8 efivars: Split ou... |
981 |
static struct efivars __efivars; |
3295814d8 efivars: Paramete... |
982 |
static struct efivar_operations ops; |
76b53f7c8 efivars: Split ou... |
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 |
/* * For now we register the efi subsystem with the firmware subsystem * and the vars subsystem with the efi subsystem. In the future, it * might make sense to split off the efi subsystem into its own * driver, but for now only efivars will register with it, so just * include it here. */ static int __init efivars_init(void) { int error = 0; printk(KERN_INFO "EFI Variables Facility v%s %s ", EFIVARS_VERSION, EFIVARS_DATE); if (!efi_enabled) |
4fc756bd9 efivars: Expose e... |
1002 |
return 0; |
76b53f7c8 efivars: Split ou... |
1003 1004 1005 1006 1007 1008 1009 1010 |
/* For now we'll register the efi directory at /sys/firmware/efi */ efi_kobj = kobject_create_and_add("efi", firmware_kobj); if (!efi_kobj) { printk(KERN_ERR "efivars: Firmware registration failed. "); return -ENOMEM; } |
3295814d8 efivars: Paramete... |
1011 1012 1013 1014 |
ops.get_variable = efi.get_variable; ops.set_variable = efi.set_variable; ops.get_next_variable = efi.get_next_variable; error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc8 efivars: handle e... |
1015 1016 |
if (error) goto err_put; |
76b53f7c8 efivars: Split ou... |
1017 1018 1019 1020 1021 1022 1023 1024 |
/* Don't forget the systab entry */ error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); if (error) { printk(KERN_ERR "efivars: Sysfs attribute export failed with error %d. ", error); |
3116aabc8 efivars: handle e... |
1025 |
goto err_unregister; |
76b53f7c8 efivars: Split ou... |
1026 |
} |
1da177e4c Linux-2.6.12-rc2 |
1027 |
|
3116aabc8 efivars: handle e... |
1028 1029 1030 1031 1032 1033 |
return 0; err_unregister: unregister_efivars(&__efivars); err_put: kobject_put(efi_kobj); |
1da177e4c Linux-2.6.12-rc2 |
1034 1035 1036 1037 1038 1039 |
return error; } static void __exit efivars_exit(void) { |
aabb6e153 efivars: prevent ... |
1040 1041 1042 1043 |
if (efi_enabled) { unregister_efivars(&__efivars); kobject_put(efi_kobj); } |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 1047 |
} module_init(efivars_init); module_exit(efivars_exit); |