Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * EFI Variables - efivars.c | |
3 | * | |
4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> | |
5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> | |
6 | * | |
7 | * This code takes all variables accessible from EFI runtime and | |
8 | * exports them via sysfs | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Changelog: | |
25 | * | |
26 | * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
27 | * remove check for efi_enabled in exit | |
28 | * add MODULE_VERSION | |
29 | * | |
30 | * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
31 | * minor bug fixes | |
32 | * | |
33 | * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) | |
34 | * converted driver to export variable information via sysfs | |
35 | * and moved to drivers/firmware directory | |
36 | * bumped revision number to v0.07 to reflect conversion & move | |
37 | * | |
38 | * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
39 | * fix locking per Peter Chubb's findings | |
40 | * | |
41 | * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
42 | * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() | |
43 | * | |
44 | * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
45 | * use list_for_each_safe when deleting vars. | |
46 | * remove ifdef CONFIG_SMP around include <linux/smp.h> | |
47 | * v0.04 release to linux-ia64@linuxia64.org | |
48 | * | |
49 | * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
50 | * Moved vars from /proc/efi to /proc/efi/vars, and made | |
51 | * efi.c own the /proc/efi directory. | |
52 | * v0.03 release to linux-ia64@linuxia64.org | |
53 | * | |
54 | * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
55 | * At the request of Stephane, moved ownership of /proc/efi | |
56 | * to efi.c, and now efivars lives under /proc/efi/vars. | |
57 | * | |
58 | * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
59 | * Feedback received from Stephane Eranian incorporated. | |
60 | * efivar_write() checks copy_from_user() return value. | |
61 | * efivar_read/write() returns proper errno. | |
62 | * v0.02 release to linux-ia64@linuxia64.org | |
63 | * | |
64 | * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
65 | * v0.01 release to linux-ia64@linuxia64.org | |
66 | */ | |
67 | ||
c59ede7b | 68 | #include <linux/capability.h> |
1da177e4 LT |
69 | #include <linux/types.h> |
70 | #include <linux/errno.h> | |
71 | #include <linux/init.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/module.h> | |
74 | #include <linux/string.h> | |
75 | #include <linux/smp.h> | |
76 | #include <linux/efi.h> | |
77 | #include <linux/sysfs.h> | |
78 | #include <linux/kobject.h> | |
79 | #include <linux/device.h> | |
5a0e3ad6 | 80 | #include <linux/slab.h> |
5ee9c198 | 81 | #include <linux/pstore.h> |
1da177e4 | 82 | |
5d9db883 MG |
83 | #include <linux/fs.h> |
84 | #include <linux/ramfs.h> | |
85 | #include <linux/pagemap.h> | |
86 | ||
1da177e4 LT |
87 | #include <asm/uaccess.h> |
88 | ||
89 | #define EFIVARS_VERSION "0.08" | |
90 | #define EFIVARS_DATE "2004-May-17" | |
91 | ||
92 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
93 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
94 | MODULE_LICENSE("GPL"); | |
95 | MODULE_VERSION(EFIVARS_VERSION); | |
96 | ||
5ee9c198 | 97 | #define DUMP_NAME_LEN 52 |
5d9db883 | 98 | #define GUID_LEN 37 |
5ee9c198 | 99 | |
1da177e4 LT |
100 | /* |
101 | * The maximum size of VariableName + Data = 1024 | |
102 | * Therefore, it's reasonable to save that much | |
103 | * space in each part of the structure, | |
104 | * and we use a page for reading/writing. | |
105 | */ | |
106 | ||
107 | struct efi_variable { | |
108 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
109 | efi_guid_t VendorGuid; | |
110 | unsigned long DataSize; | |
111 | __u8 Data[1024]; | |
112 | efi_status_t Status; | |
113 | __u32 Attributes; | |
114 | } __attribute__((packed)); | |
115 | ||
1da177e4 | 116 | struct efivar_entry { |
4142ef14 | 117 | struct efivars *efivars; |
1da177e4 LT |
118 | struct efi_variable var; |
119 | struct list_head list; | |
120 | struct kobject kobj; | |
121 | }; | |
122 | ||
1da177e4 LT |
123 | struct efivar_attribute { |
124 | struct attribute attr; | |
125 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
126 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
127 | }; | |
128 | ||
5d9db883 MG |
129 | static struct efivars __efivars; |
130 | static struct efivar_operations ops; | |
131 | ||
7644c16c MW |
132 | #define PSTORE_EFI_ATTRIBUTES \ |
133 | (EFI_VARIABLE_NON_VOLATILE | \ | |
134 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
135 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 136 | |
1da177e4 LT |
137 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
138 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 139 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
140 | .show = _show, \ |
141 | .store = _store, \ | |
142 | }; | |
143 | ||
1da177e4 LT |
144 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
145 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
146 | ||
147 | /* | |
148 | * Prototype for sysfs creation function | |
149 | */ | |
150 | static int | |
4142ef14 MW |
151 | efivar_create_sysfs_entry(struct efivars *efivars, |
152 | unsigned long variable_name_size, | |
153 | efi_char16_t *variable_name, | |
154 | efi_guid_t *vendor_guid); | |
1da177e4 LT |
155 | |
156 | /* Return the number of unicode characters in data */ | |
157 | static unsigned long | |
a2940908 | 158 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
159 | { |
160 | unsigned long length = 0; | |
161 | ||
a2940908 | 162 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
163 | length++; |
164 | return length; | |
165 | } | |
166 | ||
b728a5c8 | 167 | static inline unsigned long |
a2940908 MW |
168 | utf16_strlen(efi_char16_t *s) |
169 | { | |
170 | return utf16_strnlen(s, ~0UL); | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Return the number of bytes is the length of this string | |
175 | * Note: this is NOT the same as the number of unicode characters | |
176 | */ | |
177 | static inline unsigned long | |
a2940908 | 178 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 179 | { |
a2940908 | 180 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
181 | } |
182 | ||
828aa1f0 MW |
183 | static inline int |
184 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
185 | { | |
186 | while (1) { | |
187 | if (len == 0) | |
188 | return 0; | |
189 | if (*a < *b) | |
190 | return -1; | |
191 | if (*a > *b) | |
192 | return 1; | |
193 | if (*a == 0) /* implies *b == 0 */ | |
194 | return 0; | |
195 | a++; | |
196 | b++; | |
197 | len--; | |
198 | } | |
199 | } | |
200 | ||
fec6c20b | 201 | static bool |
54b3a4d3 MG |
202 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
203 | unsigned long len) | |
fec6c20b MG |
204 | { |
205 | struct efi_generic_dev_path *node; | |
206 | int offset = 0; | |
207 | ||
208 | node = (struct efi_generic_dev_path *)buffer; | |
209 | ||
54b3a4d3 MG |
210 | if (len < sizeof(*node)) |
211 | return false; | |
fec6c20b | 212 | |
54b3a4d3 MG |
213 | while (offset <= len - sizeof(*node) && |
214 | node->length >= sizeof(*node) && | |
215 | node->length <= len - offset) { | |
216 | offset += node->length; | |
fec6c20b MG |
217 | |
218 | if ((node->type == EFI_DEV_END_PATH || | |
219 | node->type == EFI_DEV_END_PATH2) && | |
220 | node->sub_type == EFI_DEV_END_ENTIRE) | |
221 | return true; | |
222 | ||
223 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
224 | } | |
225 | ||
226 | /* | |
227 | * If we're here then either node->length pointed past the end | |
228 | * of the buffer or we reached the end of the buffer without | |
229 | * finding a device path end node. | |
230 | */ | |
231 | return false; | |
232 | } | |
233 | ||
234 | static bool | |
54b3a4d3 MG |
235 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
236 | unsigned long len) | |
fec6c20b MG |
237 | { |
238 | /* An array of 16-bit integers */ | |
239 | if ((len % 2) != 0) | |
240 | return false; | |
241 | ||
242 | return true; | |
243 | } | |
244 | ||
245 | static bool | |
54b3a4d3 MG |
246 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
247 | unsigned long len) | |
fec6c20b MG |
248 | { |
249 | u16 filepathlength; | |
54b3a4d3 MG |
250 | int i, desclength = 0, namelen; |
251 | ||
252 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
253 | |
254 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
255 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
256 | if (var->VariableName[i] > 127 || |
257 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
258 | return true; |
259 | } | |
260 | ||
54b3a4d3 MG |
261 | /* Reject it if there's 4 digits of hex and then further content */ |
262 | if (namelen > match + 4) | |
263 | return false; | |
264 | ||
265 | /* A valid entry must be at least 8 bytes */ | |
266 | if (len < 8) | |
fec6c20b MG |
267 | return false; |
268 | ||
269 | filepathlength = buffer[4] | buffer[5] << 8; | |
270 | ||
271 | /* | |
272 | * There's no stored length for the description, so it has to be | |
273 | * found by hand | |
274 | */ | |
54b3a4d3 | 275 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
276 | |
277 | /* Each boot entry must have a descriptor */ | |
278 | if (!desclength) | |
279 | return false; | |
280 | ||
281 | /* | |
282 | * If the sum of the length of the description, the claimed filepath | |
283 | * length and the original header are greater than the length of the | |
284 | * variable, it's malformed | |
285 | */ | |
286 | if ((desclength + filepathlength + 6) > len) | |
287 | return false; | |
288 | ||
289 | /* | |
290 | * And, finally, check the filepath | |
291 | */ | |
292 | return validate_device_path(var, match, buffer + desclength + 6, | |
293 | filepathlength); | |
294 | } | |
295 | ||
296 | static bool | |
54b3a4d3 MG |
297 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
298 | unsigned long len) | |
fec6c20b MG |
299 | { |
300 | /* A single 16-bit integer */ | |
301 | if (len != 2) | |
302 | return false; | |
303 | ||
304 | return true; | |
305 | } | |
306 | ||
307 | static bool | |
54b3a4d3 MG |
308 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
309 | unsigned long len) | |
fec6c20b MG |
310 | { |
311 | int i; | |
312 | ||
313 | for (i = 0; i < len; i++) { | |
314 | if (buffer[i] > 127) | |
315 | return false; | |
316 | ||
317 | if (buffer[i] == 0) | |
318 | return true; | |
319 | } | |
320 | ||
321 | return false; | |
322 | } | |
323 | ||
324 | struct variable_validate { | |
325 | char *name; | |
326 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 327 | unsigned long len); |
fec6c20b MG |
328 | }; |
329 | ||
330 | static const struct variable_validate variable_validate[] = { | |
331 | { "BootNext", validate_uint16 }, | |
332 | { "BootOrder", validate_boot_order }, | |
333 | { "DriverOrder", validate_boot_order }, | |
334 | { "Boot*", validate_load_option }, | |
335 | { "Driver*", validate_load_option }, | |
336 | { "ConIn", validate_device_path }, | |
337 | { "ConInDev", validate_device_path }, | |
338 | { "ConOut", validate_device_path }, | |
339 | { "ConOutDev", validate_device_path }, | |
340 | { "ErrOut", validate_device_path }, | |
341 | { "ErrOutDev", validate_device_path }, | |
342 | { "Timeout", validate_uint16 }, | |
343 | { "Lang", validate_ascii_string }, | |
344 | { "PlatformLang", validate_ascii_string }, | |
345 | { "", NULL }, | |
346 | }; | |
347 | ||
348 | static bool | |
54b3a4d3 | 349 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
350 | { |
351 | int i; | |
352 | u16 *unicode_name = var->VariableName; | |
353 | ||
354 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
355 | const char *name = variable_validate[i].name; | |
356 | int match; | |
357 | ||
358 | for (match = 0; ; match++) { | |
359 | char c = name[match]; | |
360 | u16 u = unicode_name[match]; | |
361 | ||
362 | /* All special variables are plain ascii */ | |
363 | if (u > 127) | |
364 | return true; | |
365 | ||
366 | /* Wildcard in the matching name means we've matched */ | |
367 | if (c == '*') | |
368 | return variable_validate[i].validate(var, | |
369 | match, data, len); | |
370 | ||
371 | /* Case sensitive match */ | |
372 | if (c != u) | |
373 | break; | |
374 | ||
375 | /* Reached the end of the string while matching */ | |
376 | if (!c) | |
377 | return variable_validate[i].validate(var, | |
378 | match, data, len); | |
379 | } | |
380 | } | |
381 | ||
382 | return true; | |
383 | } | |
384 | ||
1da177e4 | 385 | static efi_status_t |
5ee9c198 | 386 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
387 | { |
388 | efi_status_t status; | |
389 | ||
1da177e4 | 390 | var->DataSize = 1024; |
3295814d MW |
391 | status = efivars->ops->get_variable(var->VariableName, |
392 | &var->VendorGuid, | |
393 | &var->Attributes, | |
394 | &var->DataSize, | |
395 | var->Data); | |
5ee9c198 MG |
396 | return status; |
397 | } | |
398 | ||
399 | static efi_status_t | |
400 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
401 | { | |
402 | efi_status_t status; | |
403 | ||
404 | spin_lock(&efivars->lock); | |
405 | status = get_var_data_locked(efivars, var); | |
29422693 | 406 | spin_unlock(&efivars->lock); |
5ee9c198 | 407 | |
1da177e4 LT |
408 | if (status != EFI_SUCCESS) { |
409 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
410 | status); | |
411 | } | |
412 | return status; | |
413 | } | |
414 | ||
415 | static ssize_t | |
416 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
417 | { | |
418 | struct efi_variable *var = &entry->var; | |
419 | char *str = buf; | |
420 | ||
421 | if (!entry || !buf) | |
422 | return 0; | |
423 | ||
424 | efi_guid_unparse(&var->VendorGuid, str); | |
425 | str += strlen(str); | |
426 | str += sprintf(str, "\n"); | |
427 | ||
428 | return str - buf; | |
429 | } | |
430 | ||
431 | static ssize_t | |
432 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
433 | { | |
434 | struct efi_variable *var = &entry->var; | |
435 | char *str = buf; | |
436 | efi_status_t status; | |
437 | ||
438 | if (!entry || !buf) | |
439 | return -EINVAL; | |
440 | ||
4142ef14 | 441 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
442 | if (status != EFI_SUCCESS) |
443 | return -EIO; | |
444 | ||
70839090 | 445 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 446 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 447 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 448 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 449 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 450 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
451 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
452 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
453 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
454 | str += sprintf(str, | |
455 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
456 | if (var->Attributes & | |
457 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
458 | str += sprintf(str, | |
459 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
460 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
461 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
462 | return str - buf; |
463 | } | |
464 | ||
465 | static ssize_t | |
466 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
467 | { | |
468 | struct efi_variable *var = &entry->var; | |
469 | char *str = buf; | |
470 | efi_status_t status; | |
471 | ||
472 | if (!entry || !buf) | |
473 | return -EINVAL; | |
474 | ||
4142ef14 | 475 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
476 | if (status != EFI_SUCCESS) |
477 | return -EIO; | |
478 | ||
479 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
480 | return str - buf; | |
481 | } | |
482 | ||
483 | static ssize_t | |
484 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
485 | { | |
486 | struct efi_variable *var = &entry->var; | |
487 | efi_status_t status; | |
488 | ||
489 | if (!entry || !buf) | |
490 | return -EINVAL; | |
491 | ||
4142ef14 | 492 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
493 | if (status != EFI_SUCCESS) |
494 | return -EIO; | |
495 | ||
496 | memcpy(buf, var->Data, var->DataSize); | |
497 | return var->DataSize; | |
498 | } | |
499 | /* | |
500 | * We allow each variable to be edited via rewriting the | |
501 | * entire efi variable structure. | |
502 | */ | |
503 | static ssize_t | |
504 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
505 | { | |
506 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 507 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
508 | efi_status_t status = EFI_NOT_FOUND; |
509 | ||
510 | if (count != sizeof(struct efi_variable)) | |
511 | return -EINVAL; | |
512 | ||
513 | new_var = (struct efi_variable *)buf; | |
514 | /* | |
515 | * If only updating the variable data, then the name | |
516 | * and guid should remain the same | |
517 | */ | |
518 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
519 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
520 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
525 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
fec6c20b MG |
529 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
530 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
531 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
532 | return -EINVAL; | |
533 | } | |
534 | ||
29422693 | 535 | spin_lock(&efivars->lock); |
3295814d MW |
536 | status = efivars->ops->set_variable(new_var->VariableName, |
537 | &new_var->VendorGuid, | |
538 | new_var->Attributes, | |
539 | new_var->DataSize, | |
540 | new_var->Data); | |
1da177e4 | 541 | |
29422693 | 542 | spin_unlock(&efivars->lock); |
1da177e4 LT |
543 | |
544 | if (status != EFI_SUCCESS) { | |
545 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
546 | status); | |
547 | return -EIO; | |
548 | } | |
549 | ||
550 | memcpy(&entry->var, new_var, count); | |
551 | return count; | |
552 | } | |
553 | ||
554 | static ssize_t | |
555 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
556 | { | |
557 | struct efi_variable *var = &entry->var; | |
558 | efi_status_t status; | |
559 | ||
560 | if (!entry || !buf) | |
561 | return 0; | |
562 | ||
4142ef14 | 563 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
564 | if (status != EFI_SUCCESS) |
565 | return -EIO; | |
566 | ||
567 | memcpy(buf, var, sizeof(*var)); | |
568 | return sizeof(*var); | |
569 | } | |
570 | ||
571 | /* | |
572 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 573 | * the attributes... |
1da177e4 LT |
574 | */ |
575 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
576 | char *buf) | |
577 | { | |
578 | struct efivar_entry *var = to_efivar_entry(kobj); | |
579 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 580 | ssize_t ret = -EIO; |
1da177e4 LT |
581 | |
582 | if (!capable(CAP_SYS_ADMIN)) | |
583 | return -EACCES; | |
584 | ||
585 | if (efivar_attr->show) { | |
586 | ret = efivar_attr->show(var, buf); | |
587 | } | |
588 | return ret; | |
589 | } | |
590 | ||
591 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
592 | const char *buf, size_t count) | |
593 | { | |
594 | struct efivar_entry *var = to_efivar_entry(kobj); | |
595 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 596 | ssize_t ret = -EIO; |
1da177e4 LT |
597 | |
598 | if (!capable(CAP_SYS_ADMIN)) | |
599 | return -EACCES; | |
600 | ||
601 | if (efivar_attr->store) | |
602 | ret = efivar_attr->store(var, buf, count); | |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
52cf25d0 | 607 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
608 | .show = efivar_attr_show, |
609 | .store = efivar_attr_store, | |
610 | }; | |
611 | ||
612 | static void efivar_release(struct kobject *kobj) | |
613 | { | |
614 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
615 | kfree(var); |
616 | } | |
617 | ||
618 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
619 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
620 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
621 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
622 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
623 | ||
624 | static struct attribute *def_attrs[] = { | |
625 | &efivar_attr_guid.attr, | |
626 | &efivar_attr_size.attr, | |
627 | &efivar_attr_attributes.attr, | |
628 | &efivar_attr_data.attr, | |
629 | &efivar_attr_raw_var.attr, | |
630 | NULL, | |
631 | }; | |
632 | ||
e89a4116 | 633 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
634 | .release = efivar_release, |
635 | .sysfs_ops = &efivar_attr_ops, | |
636 | .default_attrs = def_attrs, | |
637 | }; | |
638 | ||
1da177e4 LT |
639 | static inline void |
640 | efivar_unregister(struct efivar_entry *var) | |
641 | { | |
c10997f6 | 642 | kobject_put(&var->kobj); |
1da177e4 LT |
643 | } |
644 | ||
5d9db883 MG |
645 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
646 | { | |
647 | file->private_data = inode->i_private; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | static ssize_t efivarfs_file_write(struct file *file, | |
652 | const char __user *userbuf, size_t count, loff_t *ppos) | |
653 | { | |
654 | struct efivar_entry *var = file->private_data; | |
655 | struct efivars *efivars; | |
656 | efi_status_t status; | |
657 | void *data; | |
658 | u32 attributes; | |
659 | struct inode *inode = file->f_mapping->host; | |
660 | int datasize = count - sizeof(attributes); | |
661 | ||
662 | if (count < sizeof(attributes)) | |
663 | return -EINVAL; | |
664 | ||
665 | data = kmalloc(datasize, GFP_KERNEL); | |
666 | ||
667 | if (!data) | |
668 | return -ENOMEM; | |
669 | ||
670 | efivars = var->efivars; | |
671 | ||
672 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) { | |
673 | count = -EFAULT; | |
674 | goto out; | |
675 | } | |
676 | ||
677 | if (attributes & ~(EFI_VARIABLE_MASK)) { | |
678 | count = -EINVAL; | |
679 | goto out; | |
680 | } | |
681 | ||
682 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { | |
683 | count = -EFAULT; | |
684 | goto out; | |
685 | } | |
686 | ||
687 | if (validate_var(&var->var, data, datasize) == false) { | |
688 | count = -EINVAL; | |
689 | goto out; | |
690 | } | |
691 | ||
692 | status = efivars->ops->set_variable(var->var.VariableName, | |
693 | &var->var.VendorGuid, | |
694 | attributes, datasize, | |
695 | data); | |
696 | ||
697 | switch (status) { | |
698 | case EFI_SUCCESS: | |
699 | mutex_lock(&inode->i_mutex); | |
700 | i_size_write(inode, count); | |
701 | mutex_unlock(&inode->i_mutex); | |
702 | break; | |
703 | case EFI_INVALID_PARAMETER: | |
704 | count = -EINVAL; | |
705 | break; | |
706 | case EFI_OUT_OF_RESOURCES: | |
707 | count = -ENOSPC; | |
708 | break; | |
709 | case EFI_DEVICE_ERROR: | |
710 | count = -EIO; | |
711 | break; | |
712 | case EFI_WRITE_PROTECTED: | |
713 | count = -EROFS; | |
714 | break; | |
715 | case EFI_SECURITY_VIOLATION: | |
716 | count = -EACCES; | |
717 | break; | |
718 | case EFI_NOT_FOUND: | |
719 | count = -ENOENT; | |
720 | break; | |
721 | default: | |
722 | count = -EINVAL; | |
723 | break; | |
724 | } | |
725 | out: | |
726 | kfree(data); | |
727 | ||
728 | return count; | |
729 | } | |
730 | ||
731 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
732 | size_t count, loff_t *ppos) | |
733 | { | |
734 | struct efivar_entry *var = file->private_data; | |
735 | struct efivars *efivars = var->efivars; | |
736 | efi_status_t status; | |
737 | unsigned long datasize = 0; | |
738 | u32 attributes; | |
739 | void *data; | |
740 | ssize_t size; | |
741 | ||
742 | status = efivars->ops->get_variable(var->var.VariableName, | |
743 | &var->var.VendorGuid, | |
744 | &attributes, &datasize, NULL); | |
745 | ||
746 | if (status != EFI_BUFFER_TOO_SMALL) | |
747 | return 0; | |
748 | ||
749 | data = kmalloc(datasize + 4, GFP_KERNEL); | |
750 | ||
751 | if (!data) | |
752 | return 0; | |
753 | ||
754 | status = efivars->ops->get_variable(var->var.VariableName, | |
755 | &var->var.VendorGuid, | |
756 | &attributes, &datasize, | |
757 | (data + 4)); | |
758 | ||
759 | if (status != EFI_SUCCESS) | |
760 | return 0; | |
761 | ||
762 | memcpy(data, &attributes, 4); | |
763 | size = simple_read_from_buffer(userbuf, count, ppos, | |
764 | data, datasize + 4); | |
765 | kfree(data); | |
766 | ||
767 | return size; | |
768 | } | |
769 | ||
770 | static void efivarfs_evict_inode(struct inode *inode) | |
771 | { | |
772 | clear_inode(inode); | |
773 | } | |
774 | ||
775 | static const struct super_operations efivarfs_ops = { | |
776 | .statfs = simple_statfs, | |
777 | .drop_inode = generic_delete_inode, | |
778 | .evict_inode = efivarfs_evict_inode, | |
779 | .show_options = generic_show_options, | |
780 | }; | |
781 | ||
782 | static struct super_block *efivarfs_sb; | |
783 | ||
784 | static const struct inode_operations efivarfs_dir_inode_operations; | |
785 | ||
786 | static const struct file_operations efivarfs_file_operations = { | |
787 | .open = efivarfs_file_open, | |
788 | .read = efivarfs_file_read, | |
789 | .write = efivarfs_file_write, | |
790 | .llseek = no_llseek, | |
791 | }; | |
792 | ||
793 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
794 | const struct inode *dir, int mode, dev_t dev) | |
795 | { | |
796 | struct inode *inode = new_inode(sb); | |
797 | ||
798 | if (inode) { | |
799 | inode->i_ino = get_next_ino(); | |
800 | inode->i_uid = inode->i_gid = 0; | |
801 | inode->i_mode = mode; | |
802 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
803 | switch (mode & S_IFMT) { | |
804 | case S_IFREG: | |
805 | inode->i_fop = &efivarfs_file_operations; | |
806 | break; | |
807 | case S_IFDIR: | |
808 | inode->i_op = &efivarfs_dir_inode_operations; | |
809 | inode->i_fop = &simple_dir_operations; | |
810 | inc_nlink(inode); | |
811 | break; | |
812 | } | |
813 | } | |
814 | return inode; | |
815 | } | |
816 | ||
817 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) | |
818 | { | |
819 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
820 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
821 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
822 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
823 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
824 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
825 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
826 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
827 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
828 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
829 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
830 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
831 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
832 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
833 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
834 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
835 | } | |
836 | ||
837 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
838 | umode_t mode, bool excl) | |
839 | { | |
840 | struct inode *inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); | |
841 | struct efivars *efivars = &__efivars; | |
842 | struct efivar_entry *var; | |
843 | int namelen, i = 0, err = 0; | |
844 | ||
845 | if (dentry->d_name.len < 38) | |
846 | return -EINVAL; | |
847 | ||
848 | if (!inode) | |
849 | return -ENOSPC; | |
850 | ||
851 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
852 | ||
853 | if (!var) | |
854 | return -ENOMEM; | |
855 | ||
856 | namelen = dentry->d_name.len - GUID_LEN; | |
857 | ||
858 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
859 | &var->var.VendorGuid); | |
860 | ||
861 | for (i = 0; i < namelen; i++) | |
862 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
863 | ||
864 | var->var.VariableName[i] = '\0'; | |
865 | ||
866 | inode->i_private = var; | |
867 | var->efivars = efivars; | |
868 | var->kobj.kset = efivars->kset; | |
869 | ||
870 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
871 | dentry->d_name.name); | |
872 | if (err) | |
873 | goto out; | |
874 | ||
875 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
876 | spin_lock(&efivars->lock); | |
877 | list_add(&var->list, &efivars->list); | |
878 | spin_unlock(&efivars->lock); | |
879 | d_instantiate(dentry, inode); | |
880 | dget(dentry); | |
881 | out: | |
882 | if (err) | |
883 | kfree(var); | |
884 | return err; | |
885 | } | |
886 | ||
887 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
888 | { | |
889 | struct efivar_entry *var = dentry->d_inode->i_private; | |
890 | struct efivars *efivars = var->efivars; | |
891 | efi_status_t status; | |
892 | ||
893 | spin_lock(&efivars->lock); | |
894 | ||
895 | status = efivars->ops->set_variable(var->var.VariableName, | |
896 | &var->var.VendorGuid, | |
897 | 0, 0, NULL); | |
898 | ||
899 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
900 | list_del(&var->list); | |
901 | spin_unlock(&efivars->lock); | |
902 | efivar_unregister(var); | |
903 | drop_nlink(dir); | |
904 | dput(dentry); | |
905 | return 0; | |
906 | } | |
907 | ||
908 | spin_unlock(&efivars->lock); | |
909 | return -EINVAL; | |
910 | }; | |
911 | ||
912 | int efivarfs_fill_super(struct super_block *sb, void *data, int silent) | |
913 | { | |
914 | struct inode *inode = NULL; | |
915 | struct dentry *root; | |
916 | struct efivar_entry *entry, *n; | |
917 | struct efivars *efivars = &__efivars; | |
918 | int err; | |
919 | ||
920 | efivarfs_sb = sb; | |
921 | ||
922 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
923 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
924 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
925 | sb->s_magic = PSTOREFS_MAGIC; | |
926 | sb->s_op = &efivarfs_ops; | |
927 | sb->s_time_gran = 1; | |
928 | ||
929 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
930 | if (!inode) { | |
931 | err = -ENOMEM; | |
932 | goto fail; | |
933 | } | |
934 | inode->i_op = &efivarfs_dir_inode_operations; | |
935 | ||
936 | root = d_make_root(inode); | |
937 | sb->s_root = root; | |
938 | if (!root) { | |
939 | err = -ENOMEM; | |
940 | goto fail; | |
941 | } | |
942 | ||
943 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
944 | struct inode *inode; | |
945 | struct dentry *dentry, *root = efivarfs_sb->s_root; | |
946 | char *name; | |
947 | unsigned long size = 0; | |
948 | int len, i; | |
949 | ||
950 | len = utf16_strlen(entry->var.VariableName); | |
951 | ||
952 | /* GUID plus trailing NULL */ | |
953 | name = kmalloc(len + 38, GFP_ATOMIC); | |
954 | ||
955 | for (i = 0; i < len; i++) | |
956 | name[i] = entry->var.VariableName[i] & 0xFF; | |
957 | ||
958 | name[len] = '-'; | |
959 | ||
960 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
961 | ||
962 | name[len+GUID_LEN] = '\0'; | |
963 | ||
964 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
965 | S_IFREG | 0644, 0); | |
966 | dentry = d_alloc_name(root, name); | |
967 | ||
968 | efivars->ops->get_variable(entry->var.VariableName, | |
969 | &entry->var.VendorGuid, | |
970 | &entry->var.Attributes, | |
971 | &size, | |
972 | NULL); | |
973 | ||
974 | mutex_lock(&inode->i_mutex); | |
975 | inode->i_private = entry; | |
976 | i_size_write(inode, size+4); | |
977 | mutex_unlock(&inode->i_mutex); | |
978 | d_add(dentry, inode); | |
979 | } | |
980 | ||
981 | return 0; | |
982 | fail: | |
983 | iput(inode); | |
984 | return err; | |
985 | } | |
986 | ||
987 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
988 | int flags, const char *dev_name, void *data) | |
989 | { | |
990 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
991 | } | |
992 | ||
993 | static void efivarfs_kill_sb(struct super_block *sb) | |
994 | { | |
995 | kill_litter_super(sb); | |
996 | efivarfs_sb = NULL; | |
997 | } | |
998 | ||
999 | static struct file_system_type efivarfs_type = { | |
1000 | .name = "efivarfs", | |
1001 | .mount = efivarfs_mount, | |
1002 | .kill_sb = efivarfs_kill_sb, | |
1003 | }; | |
1004 | ||
1005 | static const struct inode_operations efivarfs_dir_inode_operations = { | |
1006 | .lookup = simple_lookup, | |
1007 | .unlink = efivarfs_unlink, | |
1008 | .create = efivarfs_create, | |
1009 | }; | |
1010 | ||
1011 | static struct pstore_info efi_pstore_info; | |
1012 | ||
5ee9c198 MG |
1013 | #ifdef CONFIG_PSTORE |
1014 | ||
1015 | static int efi_pstore_open(struct pstore_info *psi) | |
1016 | { | |
1017 | struct efivars *efivars = psi->data; | |
1018 | ||
1019 | spin_lock(&efivars->lock); | |
1020 | efivars->walk_entry = list_first_entry(&efivars->list, | |
1021 | struct efivar_entry, list); | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | static int efi_pstore_close(struct pstore_info *psi) | |
1026 | { | |
1027 | struct efivars *efivars = psi->data; | |
1028 | ||
1029 | spin_unlock(&efivars->lock); | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
f6f82851 KC |
1034 | struct timespec *timespec, |
1035 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1036 | { |
1037 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1038 | struct efivars *efivars = psi->data; | |
1039 | char name[DUMP_NAME_LEN]; | |
1040 | int i; | |
1041 | unsigned int part, size; | |
1042 | unsigned long time; | |
1043 | ||
1044 | while (&efivars->walk_entry->list != &efivars->list) { | |
1045 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1046 | vendor)) { | |
1047 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1048 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1049 | } | |
1050 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { | |
1051 | *id = part; | |
1052 | timespec->tv_sec = time; | |
1053 | timespec->tv_nsec = 0; | |
1054 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1055 | size = efivars->walk_entry->var.DataSize; | |
f6f82851 KC |
1056 | *buf = kmalloc(size, GFP_KERNEL); |
1057 | if (*buf == NULL) | |
1058 | return -ENOMEM; | |
1059 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1060 | size); | |
5ee9c198 MG |
1061 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
1062 | struct efivar_entry, list); | |
1063 | return size; | |
1064 | } | |
1065 | } | |
1066 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1067 | struct efivar_entry, list); | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | ||
3d6d8d20 KC |
1072 | static int efi_pstore_write(enum pstore_type_id type, |
1073 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 1074 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
1075 | { |
1076 | char name[DUMP_NAME_LEN]; | |
1077 | char stub_name[DUMP_NAME_LEN]; | |
1078 | efi_char16_t efi_name[DUMP_NAME_LEN]; | |
1079 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1080 | struct efivars *efivars = psi->data; | |
1081 | struct efivar_entry *entry, *found = NULL; | |
b238b8fa | 1082 | int i, ret = 0; |
5ee9c198 MG |
1083 | |
1084 | sprintf(stub_name, "dump-type%u-%u-", type, part); | |
1085 | sprintf(name, "%s%lu", stub_name, get_seconds()); | |
1086 | ||
1087 | spin_lock(&efivars->lock); | |
1088 | ||
1089 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1090 | efi_name[i] = stub_name[i]; | |
1091 | ||
1092 | /* | |
1093 | * Clean up any entries with the same name | |
1094 | */ | |
1095 | ||
1096 | list_for_each_entry(entry, &efivars->list, list) { | |
1097 | get_var_data_locked(efivars, &entry->var); | |
1098 | ||
c475594d MW |
1099 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
1100 | continue; | |
1101 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
1102 | utf16_strlen(efi_name))) | |
1103 | continue; | |
1104 | /* Needs to be a prefix */ | |
1105 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) | |
1106 | continue; | |
1107 | ||
1108 | /* found */ | |
1109 | found = entry; | |
7644c16c MW |
1110 | efivars->ops->set_variable(entry->var.VariableName, |
1111 | &entry->var.VendorGuid, | |
1112 | PSTORE_EFI_ATTRIBUTES, | |
c475594d | 1113 | 0, NULL); |
5ee9c198 MG |
1114 | } |
1115 | ||
1116 | if (found) | |
1117 | list_del(&found->list); | |
1118 | ||
1119 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1120 | efi_name[i] = name[i]; | |
1121 | ||
7644c16c | 1122 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1123 | size, psi->buf); |
1124 | ||
1125 | spin_unlock(&efivars->lock); | |
1126 | ||
1127 | if (found) | |
1128 | efivar_unregister(found); | |
1129 | ||
1130 | if (size) | |
b238b8fa | 1131 | ret = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1132 | utf16_strsize(efi_name, |
1133 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
1134 | efi_name, &vendor); |
1135 | ||
b238b8fa CG |
1136 | *id = part; |
1137 | return ret; | |
5ee9c198 MG |
1138 | }; |
1139 | ||
1140 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
1141 | struct pstore_info *psi) | |
1142 | { | |
3d6d8d20 | 1143 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
5ee9c198 MG |
1144 | |
1145 | return 0; | |
1146 | } | |
1147 | #else | |
1148 | static int efi_pstore_open(struct pstore_info *psi) | |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int efi_pstore_close(struct pstore_info *psi) | |
1154 | { | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
eee628da CF |
1159 | struct timespec *timespec, |
1160 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1161 | { |
1162 | return -1; | |
1163 | } | |
1164 | ||
3d6d8d20 KC |
1165 | static int efi_pstore_write(enum pstore_type_id type, |
1166 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 1167 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
1168 | { |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
1173 | struct pstore_info *psi) | |
1174 | { | |
1175 | return 0; | |
1176 | } | |
1177 | #endif | |
1178 | ||
1179 | static struct pstore_info efi_pstore_info = { | |
1180 | .owner = THIS_MODULE, | |
1181 | .name = "efi", | |
1182 | .open = efi_pstore_open, | |
1183 | .close = efi_pstore_close, | |
1184 | .read = efi_pstore_read, | |
1185 | .write = efi_pstore_write, | |
1186 | .erase = efi_pstore_erase, | |
1187 | }; | |
1da177e4 | 1188 | |
2c3c8bea | 1189 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1190 | struct bin_attribute *bin_attr, |
1191 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1192 | { |
1193 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1194 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1195 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1196 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1197 | efi_status_t status = EFI_NOT_FOUND; |
1198 | int found = 0; | |
1199 | ||
1200 | if (!capable(CAP_SYS_ADMIN)) | |
1201 | return -EACCES; | |
1202 | ||
fec6c20b MG |
1203 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1204 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1205 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | ||
29422693 | 1209 | spin_lock(&efivars->lock); |
1da177e4 LT |
1210 | |
1211 | /* | |
1212 | * Does this variable already exist? | |
1213 | */ | |
29422693 | 1214 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1215 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1216 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1217 | if (strsize1 == strsize2 && |
1218 | !memcmp(&(search_efivar->var.VariableName), | |
1219 | new_var->VariableName, strsize1) && | |
1220 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1221 | new_var->VendorGuid)) { | |
1222 | found = 1; | |
1223 | break; | |
1224 | } | |
1225 | } | |
1226 | if (found) { | |
29422693 | 1227 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1228 | return -EINVAL; |
1229 | } | |
1230 | ||
1231 | /* now *really* create the variable via EFI */ | |
3295814d MW |
1232 | status = efivars->ops->set_variable(new_var->VariableName, |
1233 | &new_var->VendorGuid, | |
1234 | new_var->Attributes, | |
1235 | new_var->DataSize, | |
1236 | new_var->Data); | |
1da177e4 LT |
1237 | |
1238 | if (status != EFI_SUCCESS) { | |
1239 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1240 | status); | |
29422693 | 1241 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1242 | return -EIO; |
1243 | } | |
29422693 | 1244 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1245 | |
1246 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1247 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1248 | utf16_strsize(new_var->VariableName, |
1249 | 1024), | |
4142ef14 MW |
1250 | new_var->VariableName, |
1251 | &new_var->VendorGuid); | |
1da177e4 LT |
1252 | if (status) { |
1253 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1254 | } | |
1255 | return count; | |
1256 | } | |
1257 | ||
2c3c8bea | 1258 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1259 | struct bin_attribute *bin_attr, |
1260 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1261 | { |
1262 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1263 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1264 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1265 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1266 | efi_status_t status = EFI_NOT_FOUND; |
1267 | int found = 0; | |
1268 | ||
1269 | if (!capable(CAP_SYS_ADMIN)) | |
1270 | return -EACCES; | |
1271 | ||
29422693 | 1272 | spin_lock(&efivars->lock); |
1da177e4 LT |
1273 | |
1274 | /* | |
1275 | * Does this variable already exist? | |
1276 | */ | |
29422693 | 1277 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1278 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1279 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1280 | if (strsize1 == strsize2 && |
1281 | !memcmp(&(search_efivar->var.VariableName), | |
1282 | del_var->VariableName, strsize1) && | |
1283 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1284 | del_var->VendorGuid)) { | |
1285 | found = 1; | |
1286 | break; | |
1287 | } | |
1288 | } | |
1289 | if (!found) { | |
29422693 | 1290 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1291 | return -EINVAL; |
1292 | } | |
1293 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1294 | del_var->Attributes = 0; | |
1295 | del_var->DataSize = 0; | |
1296 | ||
3295814d MW |
1297 | status = efivars->ops->set_variable(del_var->VariableName, |
1298 | &del_var->VendorGuid, | |
1299 | del_var->Attributes, | |
1300 | del_var->DataSize, | |
1301 | del_var->Data); | |
1da177e4 LT |
1302 | |
1303 | if (status != EFI_SUCCESS) { | |
1304 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1305 | status); | |
29422693 | 1306 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1307 | return -EIO; |
1308 | } | |
496a0fc8 | 1309 | list_del(&search_efivar->list); |
1da177e4 | 1310 | /* We need to release this lock before unregistering. */ |
29422693 | 1311 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1312 | efivar_unregister(search_efivar); |
1313 | ||
1314 | /* It's dead Jim.... */ | |
1315 | return count; | |
1316 | } | |
1317 | ||
1da177e4 LT |
1318 | /* |
1319 | * Let's not leave out systab information that snuck into | |
1320 | * the efivars driver | |
1321 | */ | |
334c6307 GKH |
1322 | static ssize_t systab_show(struct kobject *kobj, |
1323 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1324 | { |
1325 | char *str = buf; | |
1326 | ||
334c6307 | 1327 | if (!kobj || !buf) |
1da177e4 LT |
1328 | return -EINVAL; |
1329 | ||
b2c99e3c BH |
1330 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1331 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1332 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1333 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1334 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1335 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1336 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1337 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1338 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1339 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1340 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1341 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1342 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1343 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1344 | |
1345 | return str - buf; | |
1346 | } | |
1347 | ||
334c6307 GKH |
1348 | static struct kobj_attribute efi_attr_systab = |
1349 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1350 | |
334c6307 GKH |
1351 | static struct attribute *efi_subsys_attrs[] = { |
1352 | &efi_attr_systab.attr, | |
1da177e4 LT |
1353 | NULL, /* maybe more in the future? */ |
1354 | }; | |
1355 | ||
334c6307 GKH |
1356 | static struct attribute_group efi_subsys_attr_group = { |
1357 | .attrs = efi_subsys_attrs, | |
1358 | }; | |
1359 | ||
bc87d2fe | 1360 | static struct kobject *efi_kobj; |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * efivar_create_sysfs_entry() | |
1364 | * Requires: | |
1365 | * variable_name_size = number of bytes required to hold | |
1366 | * variable_name (not counting the NULL | |
1367 | * character at the end. | |
29422693 | 1368 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1369 | * Returns 1 on failure, 0 on success |
1370 | */ | |
1371 | static int | |
4142ef14 MW |
1372 | efivar_create_sysfs_entry(struct efivars *efivars, |
1373 | unsigned long variable_name_size, | |
1374 | efi_char16_t *variable_name, | |
1375 | efi_guid_t *vendor_guid) | |
1da177e4 LT |
1376 | { |
1377 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | |
1378 | char *short_name; | |
1379 | struct efivar_entry *new_efivar; | |
1380 | ||
9c215384 DS |
1381 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
1382 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
1da177e4 LT |
1383 | |
1384 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1385 | kfree(short_name); |
1386 | kfree(new_efivar); | |
1da177e4 LT |
1387 | return 1; |
1388 | } | |
1da177e4 | 1389 | |
4142ef14 | 1390 | new_efivar->efivars = efivars; |
1da177e4 LT |
1391 | memcpy(new_efivar->var.VariableName, variable_name, |
1392 | variable_name_size); | |
1393 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1394 | ||
1395 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1396 | ala UTF-8 */ | |
1397 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1398 | short_name[i] = variable_name[i] & 0xFF; | |
1399 | } | |
1400 | /* This is ugly, but necessary to separate one vendor's | |
1401 | private variables from another's. */ | |
1402 | ||
1403 | *(short_name + strlen(short_name)) = '-'; | |
1404 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1405 | ||
29422693 | 1406 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1407 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1408 | "%s", short_name); | |
69b2186c JG |
1409 | if (i) { |
1410 | kfree(short_name); | |
1411 | kfree(new_efivar); | |
1412 | return 1; | |
1413 | } | |
1da177e4 | 1414 | |
d6d292c4 | 1415 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1416 | kfree(short_name); |
1417 | short_name = NULL; | |
1da177e4 | 1418 | |
29422693 MW |
1419 | spin_lock(&efivars->lock); |
1420 | list_add(&new_efivar->list, &efivars->list); | |
1421 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
1422 | |
1423 | return 0; | |
1424 | } | |
d502fbb0 MW |
1425 | |
1426 | static int | |
1427 | create_efivars_bin_attributes(struct efivars *efivars) | |
1428 | { | |
1429 | struct bin_attribute *attr; | |
1430 | int error; | |
1431 | ||
1432 | /* new_var */ | |
1433 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1434 | if (!attr) | |
1435 | return -ENOMEM; | |
1436 | ||
1437 | attr->attr.name = "new_var"; | |
1438 | attr->attr.mode = 0200; | |
1439 | attr->write = efivar_create; | |
1440 | attr->private = efivars; | |
1441 | efivars->new_var = attr; | |
1442 | ||
1443 | /* del_var */ | |
1444 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1445 | if (!attr) { | |
1446 | error = -ENOMEM; | |
1447 | goto out_free; | |
1448 | } | |
1449 | attr->attr.name = "del_var"; | |
1450 | attr->attr.mode = 0200; | |
1451 | attr->write = efivar_delete; | |
1452 | attr->private = efivars; | |
1453 | efivars->del_var = attr; | |
1454 | ||
1455 | sysfs_bin_attr_init(efivars->new_var); | |
1456 | sysfs_bin_attr_init(efivars->del_var); | |
1457 | ||
1458 | /* Register */ | |
1459 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1460 | efivars->new_var); | |
1461 | if (error) { | |
1462 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1463 | " due to error %d\n", error); | |
1464 | goto out_free; | |
1465 | } | |
1466 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1467 | efivars->del_var); | |
1468 | if (error) { | |
1469 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1470 | " due to error %d\n", error); | |
1471 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1472 | efivars->new_var); | |
1473 | goto out_free; | |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | out_free: | |
051d51bc DC |
1478 | kfree(efivars->del_var); |
1479 | efivars->del_var = NULL; | |
d502fbb0 MW |
1480 | kfree(efivars->new_var); |
1481 | efivars->new_var = NULL; | |
1482 | return error; | |
1483 | } | |
1484 | ||
4fc756bd | 1485 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1486 | { |
1487 | struct efivar_entry *entry, *n; | |
4142ef14 | 1488 | |
76b53f7c MW |
1489 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
1490 | spin_lock(&efivars->lock); | |
1491 | list_del(&entry->list); | |
1492 | spin_unlock(&efivars->lock); | |
1493 | efivar_unregister(entry); | |
1494 | } | |
1495 | if (efivars->new_var) | |
1496 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1497 | if (efivars->del_var) | |
1498 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1499 | kfree(efivars->new_var); | |
1500 | kfree(efivars->del_var); | |
1501 | kset_unregister(efivars->kset); | |
1502 | } | |
4fc756bd | 1503 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1504 | |
4fc756bd MW |
1505 | int register_efivars(struct efivars *efivars, |
1506 | const struct efivar_operations *ops, | |
1507 | struct kobject *parent_kobj) | |
1da177e4 LT |
1508 | { |
1509 | efi_status_t status = EFI_NOT_FOUND; | |
1510 | efi_guid_t vendor_guid; | |
1511 | efi_char16_t *variable_name; | |
1da177e4 | 1512 | unsigned long variable_name_size = 1024; |
334c6307 | 1513 | int error = 0; |
1da177e4 | 1514 | |
9c215384 | 1515 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1516 | if (!variable_name) { |
1517 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1518 | return -ENOMEM; | |
1519 | } | |
1520 | ||
29422693 MW |
1521 | spin_lock_init(&efivars->lock); |
1522 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1523 | efivars->ops = ops; |
29422693 | 1524 | |
76b53f7c | 1525 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1526 | if (!efivars->kset) { |
66ac831e GKH |
1527 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1528 | error = -ENOMEM; | |
76b53f7c | 1529 | goto out; |
1da177e4 LT |
1530 | } |
1531 | ||
1532 | /* | |
1533 | * Per EFI spec, the maximum storage allocated for both | |
1534 | * the variable name and variable data is 1024 bytes. | |
1535 | */ | |
1536 | ||
1537 | do { | |
1538 | variable_name_size = 1024; | |
1539 | ||
3295814d | 1540 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
1541 | variable_name, |
1542 | &vendor_guid); | |
1543 | switch (status) { | |
1544 | case EFI_SUCCESS: | |
4142ef14 MW |
1545 | efivar_create_sysfs_entry(efivars, |
1546 | variable_name_size, | |
1547 | variable_name, | |
1548 | &vendor_guid); | |
1da177e4 LT |
1549 | break; |
1550 | case EFI_NOT_FOUND: | |
1551 | break; | |
1552 | default: | |
1553 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
1554 | status); | |
1555 | status = EFI_NOT_FOUND; | |
1556 | break; | |
1557 | } | |
1558 | } while (status != EFI_NOT_FOUND); | |
1559 | ||
d502fbb0 | 1560 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 1561 | if (error) |
76b53f7c | 1562 | unregister_efivars(efivars); |
1da177e4 | 1563 | |
5ee9c198 MG |
1564 | efivars->efi_pstore_info = efi_pstore_info; |
1565 | ||
1566 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1567 | if (efivars->efi_pstore_info.buf) { | |
1568 | efivars->efi_pstore_info.bufsize = 1024; | |
1569 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 1570 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
1571 | pstore_register(&efivars->efi_pstore_info); |
1572 | } | |
1573 | ||
5d9db883 MG |
1574 | register_filesystem(&efivarfs_type); |
1575 | ||
76b53f7c MW |
1576 | out: |
1577 | kfree(variable_name); | |
1da177e4 | 1578 | |
76b53f7c MW |
1579 | return error; |
1580 | } | |
4fc756bd | 1581 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 1582 | |
76b53f7c MW |
1583 | /* |
1584 | * For now we register the efi subsystem with the firmware subsystem | |
1585 | * and the vars subsystem with the efi subsystem. In the future, it | |
1586 | * might make sense to split off the efi subsystem into its own | |
1587 | * driver, but for now only efivars will register with it, so just | |
1588 | * include it here. | |
1589 | */ | |
1590 | ||
1591 | static int __init | |
1592 | efivars_init(void) | |
1593 | { | |
1594 | int error = 0; | |
1595 | ||
1596 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1597 | EFIVARS_DATE); | |
1598 | ||
1599 | if (!efi_enabled) | |
4fc756bd | 1600 | return 0; |
76b53f7c MW |
1601 | |
1602 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1603 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1604 | if (!efi_kobj) { | |
1605 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1606 | return -ENOMEM; | |
1607 | } | |
1608 | ||
3295814d MW |
1609 | ops.get_variable = efi.get_variable; |
1610 | ops.set_variable = efi.set_variable; | |
1611 | ops.get_next_variable = efi.get_next_variable; | |
1612 | error = register_efivars(&__efivars, &ops, efi_kobj); | |
3116aabc DC |
1613 | if (error) |
1614 | goto err_put; | |
76b53f7c MW |
1615 | |
1616 | /* Don't forget the systab entry */ | |
1617 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1618 | if (error) { | |
1619 | printk(KERN_ERR | |
1620 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1621 | error); | |
3116aabc | 1622 | goto err_unregister; |
76b53f7c | 1623 | } |
1da177e4 | 1624 | |
3116aabc DC |
1625 | return 0; |
1626 | ||
1627 | err_unregister: | |
1628 | unregister_efivars(&__efivars); | |
1629 | err_put: | |
1630 | kobject_put(efi_kobj); | |
1da177e4 LT |
1631 | return error; |
1632 | } | |
1633 | ||
1634 | static void __exit | |
1635 | efivars_exit(void) | |
1636 | { | |
aabb6e15 RD |
1637 | if (efi_enabled) { |
1638 | unregister_efivars(&__efivars); | |
1639 | kobject_put(efi_kobj); | |
1640 | } | |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | module_init(efivars_init); | |
1644 | module_exit(efivars_exit); | |
1645 |