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); | |
0c542edd | 661 | unsigned long newdatasize; |
5d9db883 MG |
662 | |
663 | if (count < sizeof(attributes)) | |
664 | return -EINVAL; | |
665 | ||
666 | data = kmalloc(datasize, GFP_KERNEL); | |
667 | ||
668 | if (!data) | |
669 | return -ENOMEM; | |
670 | ||
671 | efivars = var->efivars; | |
672 | ||
673 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) { | |
674 | count = -EFAULT; | |
675 | goto out; | |
676 | } | |
677 | ||
678 | if (attributes & ~(EFI_VARIABLE_MASK)) { | |
679 | count = -EINVAL; | |
680 | goto out; | |
681 | } | |
682 | ||
683 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { | |
684 | count = -EFAULT; | |
685 | goto out; | |
686 | } | |
687 | ||
688 | if (validate_var(&var->var, data, datasize) == false) { | |
689 | count = -EINVAL; | |
690 | goto out; | |
691 | } | |
692 | ||
693 | status = efivars->ops->set_variable(var->var.VariableName, | |
694 | &var->var.VendorGuid, | |
695 | attributes, datasize, | |
696 | data); | |
697 | ||
698 | switch (status) { | |
699 | case EFI_SUCCESS: | |
5d9db883 MG |
700 | break; |
701 | case EFI_INVALID_PARAMETER: | |
702 | count = -EINVAL; | |
0c542edd | 703 | goto out; |
5d9db883 MG |
704 | case EFI_OUT_OF_RESOURCES: |
705 | count = -ENOSPC; | |
0c542edd | 706 | goto out; |
5d9db883 MG |
707 | case EFI_DEVICE_ERROR: |
708 | count = -EIO; | |
0c542edd | 709 | goto out; |
5d9db883 MG |
710 | case EFI_WRITE_PROTECTED: |
711 | count = -EROFS; | |
0c542edd | 712 | goto out; |
5d9db883 MG |
713 | case EFI_SECURITY_VIOLATION: |
714 | count = -EACCES; | |
0c542edd | 715 | goto out; |
5d9db883 MG |
716 | case EFI_NOT_FOUND: |
717 | count = -ENOENT; | |
0c542edd | 718 | goto out; |
5d9db883 MG |
719 | default: |
720 | count = -EINVAL; | |
0c542edd | 721 | goto out; |
5d9db883 | 722 | } |
0c542edd JK |
723 | |
724 | /* | |
725 | * Writing to the variable may have caused a change in size (which | |
726 | * could either be an append or an overwrite), or the variable to be | |
727 | * deleted. Perform a GetVariable() so we can tell what actually | |
728 | * happened. | |
729 | */ | |
730 | newdatasize = 0; | |
731 | status = efivars->ops->get_variable(var->var.VariableName, | |
732 | &var->var.VendorGuid, | |
733 | NULL, &newdatasize, | |
734 | NULL); | |
735 | ||
736 | if (status == EFI_BUFFER_TOO_SMALL) { | |
737 | mutex_lock(&inode->i_mutex); | |
738 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
739 | mutex_unlock(&inode->i_mutex); | |
740 | ||
741 | } else if (status == EFI_NOT_FOUND) { | |
742 | spin_lock(&efivars->lock); | |
743 | list_del(&var->list); | |
744 | spin_unlock(&efivars->lock); | |
745 | efivar_unregister(var); | |
746 | drop_nlink(inode); | |
747 | dput(file->f_dentry); | |
748 | ||
749 | } else { | |
750 | pr_warn("efivarfs: inconsistent EFI variable implementation? " | |
751 | "status = %lx\n", status); | |
752 | } | |
753 | ||
5d9db883 MG |
754 | out: |
755 | kfree(data); | |
756 | ||
757 | return count; | |
758 | } | |
759 | ||
760 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
761 | size_t count, loff_t *ppos) | |
762 | { | |
763 | struct efivar_entry *var = file->private_data; | |
764 | struct efivars *efivars = var->efivars; | |
765 | efi_status_t status; | |
766 | unsigned long datasize = 0; | |
767 | u32 attributes; | |
768 | void *data; | |
769 | ssize_t size; | |
770 | ||
771 | status = efivars->ops->get_variable(var->var.VariableName, | |
772 | &var->var.VendorGuid, | |
773 | &attributes, &datasize, NULL); | |
774 | ||
775 | if (status != EFI_BUFFER_TOO_SMALL) | |
776 | return 0; | |
777 | ||
778 | data = kmalloc(datasize + 4, GFP_KERNEL); | |
779 | ||
780 | if (!data) | |
781 | return 0; | |
782 | ||
783 | status = efivars->ops->get_variable(var->var.VariableName, | |
784 | &var->var.VendorGuid, | |
785 | &attributes, &datasize, | |
786 | (data + 4)); | |
787 | ||
788 | if (status != EFI_SUCCESS) | |
789 | return 0; | |
790 | ||
791 | memcpy(data, &attributes, 4); | |
792 | size = simple_read_from_buffer(userbuf, count, ppos, | |
793 | data, datasize + 4); | |
794 | kfree(data); | |
795 | ||
796 | return size; | |
797 | } | |
798 | ||
799 | static void efivarfs_evict_inode(struct inode *inode) | |
800 | { | |
801 | clear_inode(inode); | |
802 | } | |
803 | ||
804 | static const struct super_operations efivarfs_ops = { | |
805 | .statfs = simple_statfs, | |
806 | .drop_inode = generic_delete_inode, | |
807 | .evict_inode = efivarfs_evict_inode, | |
808 | .show_options = generic_show_options, | |
809 | }; | |
810 | ||
811 | static struct super_block *efivarfs_sb; | |
812 | ||
813 | static const struct inode_operations efivarfs_dir_inode_operations; | |
814 | ||
815 | static const struct file_operations efivarfs_file_operations = { | |
816 | .open = efivarfs_file_open, | |
817 | .read = efivarfs_file_read, | |
818 | .write = efivarfs_file_write, | |
819 | .llseek = no_llseek, | |
820 | }; | |
821 | ||
822 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
823 | const struct inode *dir, int mode, dev_t dev) | |
824 | { | |
825 | struct inode *inode = new_inode(sb); | |
826 | ||
827 | if (inode) { | |
828 | inode->i_ino = get_next_ino(); | |
829 | inode->i_uid = inode->i_gid = 0; | |
830 | inode->i_mode = mode; | |
831 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
832 | switch (mode & S_IFMT) { | |
833 | case S_IFREG: | |
834 | inode->i_fop = &efivarfs_file_operations; | |
835 | break; | |
836 | case S_IFDIR: | |
837 | inode->i_op = &efivarfs_dir_inode_operations; | |
838 | inode->i_fop = &simple_dir_operations; | |
839 | inc_nlink(inode); | |
840 | break; | |
841 | } | |
842 | } | |
843 | return inode; | |
844 | } | |
845 | ||
846 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) | |
847 | { | |
848 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
849 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
850 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
851 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
852 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
853 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
854 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
855 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
856 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
857 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
858 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
859 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
860 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
861 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
862 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
863 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
864 | } | |
865 | ||
866 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
867 | umode_t mode, bool excl) | |
868 | { | |
869 | struct inode *inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); | |
870 | struct efivars *efivars = &__efivars; | |
871 | struct efivar_entry *var; | |
872 | int namelen, i = 0, err = 0; | |
873 | ||
874 | if (dentry->d_name.len < 38) | |
875 | return -EINVAL; | |
876 | ||
877 | if (!inode) | |
878 | return -ENOSPC; | |
879 | ||
880 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
881 | ||
882 | if (!var) | |
883 | return -ENOMEM; | |
884 | ||
885 | namelen = dentry->d_name.len - GUID_LEN; | |
886 | ||
887 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
888 | &var->var.VendorGuid); | |
889 | ||
890 | for (i = 0; i < namelen; i++) | |
891 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
892 | ||
893 | var->var.VariableName[i] = '\0'; | |
894 | ||
895 | inode->i_private = var; | |
896 | var->efivars = efivars; | |
897 | var->kobj.kset = efivars->kset; | |
898 | ||
899 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
900 | dentry->d_name.name); | |
901 | if (err) | |
902 | goto out; | |
903 | ||
904 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
905 | spin_lock(&efivars->lock); | |
906 | list_add(&var->list, &efivars->list); | |
907 | spin_unlock(&efivars->lock); | |
908 | d_instantiate(dentry, inode); | |
909 | dget(dentry); | |
910 | out: | |
911 | if (err) | |
912 | kfree(var); | |
913 | return err; | |
914 | } | |
915 | ||
916 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
917 | { | |
918 | struct efivar_entry *var = dentry->d_inode->i_private; | |
919 | struct efivars *efivars = var->efivars; | |
920 | efi_status_t status; | |
921 | ||
922 | spin_lock(&efivars->lock); | |
923 | ||
924 | status = efivars->ops->set_variable(var->var.VariableName, | |
925 | &var->var.VendorGuid, | |
926 | 0, 0, NULL); | |
927 | ||
928 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
929 | list_del(&var->list); | |
930 | spin_unlock(&efivars->lock); | |
931 | efivar_unregister(var); | |
932 | drop_nlink(dir); | |
933 | dput(dentry); | |
934 | return 0; | |
935 | } | |
936 | ||
937 | spin_unlock(&efivars->lock); | |
938 | return -EINVAL; | |
939 | }; | |
940 | ||
941 | int efivarfs_fill_super(struct super_block *sb, void *data, int silent) | |
942 | { | |
943 | struct inode *inode = NULL; | |
944 | struct dentry *root; | |
945 | struct efivar_entry *entry, *n; | |
946 | struct efivars *efivars = &__efivars; | |
947 | int err; | |
948 | ||
949 | efivarfs_sb = sb; | |
950 | ||
951 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
952 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
953 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
954 | sb->s_magic = PSTOREFS_MAGIC; | |
955 | sb->s_op = &efivarfs_ops; | |
956 | sb->s_time_gran = 1; | |
957 | ||
958 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
959 | if (!inode) { | |
960 | err = -ENOMEM; | |
961 | goto fail; | |
962 | } | |
963 | inode->i_op = &efivarfs_dir_inode_operations; | |
964 | ||
965 | root = d_make_root(inode); | |
966 | sb->s_root = root; | |
967 | if (!root) { | |
968 | err = -ENOMEM; | |
969 | goto fail; | |
970 | } | |
971 | ||
972 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
973 | struct inode *inode; | |
974 | struct dentry *dentry, *root = efivarfs_sb->s_root; | |
975 | char *name; | |
976 | unsigned long size = 0; | |
977 | int len, i; | |
978 | ||
979 | len = utf16_strlen(entry->var.VariableName); | |
980 | ||
981 | /* GUID plus trailing NULL */ | |
982 | name = kmalloc(len + 38, GFP_ATOMIC); | |
983 | ||
984 | for (i = 0; i < len; i++) | |
985 | name[i] = entry->var.VariableName[i] & 0xFF; | |
986 | ||
987 | name[len] = '-'; | |
988 | ||
989 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
990 | ||
991 | name[len+GUID_LEN] = '\0'; | |
992 | ||
993 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
994 | S_IFREG | 0644, 0); | |
995 | dentry = d_alloc_name(root, name); | |
996 | ||
997 | efivars->ops->get_variable(entry->var.VariableName, | |
998 | &entry->var.VendorGuid, | |
999 | &entry->var.Attributes, | |
1000 | &size, | |
1001 | NULL); | |
1002 | ||
1003 | mutex_lock(&inode->i_mutex); | |
1004 | inode->i_private = entry; | |
1005 | i_size_write(inode, size+4); | |
1006 | mutex_unlock(&inode->i_mutex); | |
1007 | d_add(dentry, inode); | |
1008 | } | |
1009 | ||
1010 | return 0; | |
1011 | fail: | |
1012 | iput(inode); | |
1013 | return err; | |
1014 | } | |
1015 | ||
1016 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1017 | int flags, const char *dev_name, void *data) | |
1018 | { | |
1019 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1020 | } | |
1021 | ||
1022 | static void efivarfs_kill_sb(struct super_block *sb) | |
1023 | { | |
1024 | kill_litter_super(sb); | |
1025 | efivarfs_sb = NULL; | |
1026 | } | |
1027 | ||
1028 | static struct file_system_type efivarfs_type = { | |
1029 | .name = "efivarfs", | |
1030 | .mount = efivarfs_mount, | |
1031 | .kill_sb = efivarfs_kill_sb, | |
1032 | }; | |
1033 | ||
1034 | static const struct inode_operations efivarfs_dir_inode_operations = { | |
1035 | .lookup = simple_lookup, | |
1036 | .unlink = efivarfs_unlink, | |
1037 | .create = efivarfs_create, | |
1038 | }; | |
1039 | ||
1040 | static struct pstore_info efi_pstore_info; | |
1041 | ||
5ee9c198 MG |
1042 | #ifdef CONFIG_PSTORE |
1043 | ||
1044 | static int efi_pstore_open(struct pstore_info *psi) | |
1045 | { | |
1046 | struct efivars *efivars = psi->data; | |
1047 | ||
1048 | spin_lock(&efivars->lock); | |
1049 | efivars->walk_entry = list_first_entry(&efivars->list, | |
1050 | struct efivar_entry, list); | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static int efi_pstore_close(struct pstore_info *psi) | |
1055 | { | |
1056 | struct efivars *efivars = psi->data; | |
1057 | ||
1058 | spin_unlock(&efivars->lock); | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
f6f82851 KC |
1063 | struct timespec *timespec, |
1064 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1065 | { |
1066 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1067 | struct efivars *efivars = psi->data; | |
1068 | char name[DUMP_NAME_LEN]; | |
1069 | int i; | |
1070 | unsigned int part, size; | |
1071 | unsigned long time; | |
1072 | ||
1073 | while (&efivars->walk_entry->list != &efivars->list) { | |
1074 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1075 | vendor)) { | |
1076 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1077 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1078 | } | |
1079 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { | |
1080 | *id = part; | |
1081 | timespec->tv_sec = time; | |
1082 | timespec->tv_nsec = 0; | |
1083 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1084 | size = efivars->walk_entry->var.DataSize; | |
f6f82851 KC |
1085 | *buf = kmalloc(size, GFP_KERNEL); |
1086 | if (*buf == NULL) | |
1087 | return -ENOMEM; | |
1088 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1089 | size); | |
5ee9c198 MG |
1090 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
1091 | struct efivar_entry, list); | |
1092 | return size; | |
1093 | } | |
1094 | } | |
1095 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1096 | struct efivar_entry, list); | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
3d6d8d20 KC |
1101 | static int efi_pstore_write(enum pstore_type_id type, |
1102 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 1103 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
1104 | { |
1105 | char name[DUMP_NAME_LEN]; | |
1106 | char stub_name[DUMP_NAME_LEN]; | |
1107 | efi_char16_t efi_name[DUMP_NAME_LEN]; | |
1108 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1109 | struct efivars *efivars = psi->data; | |
1110 | struct efivar_entry *entry, *found = NULL; | |
b238b8fa | 1111 | int i, ret = 0; |
5ee9c198 MG |
1112 | |
1113 | sprintf(stub_name, "dump-type%u-%u-", type, part); | |
1114 | sprintf(name, "%s%lu", stub_name, get_seconds()); | |
1115 | ||
1116 | spin_lock(&efivars->lock); | |
1117 | ||
1118 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1119 | efi_name[i] = stub_name[i]; | |
1120 | ||
1121 | /* | |
1122 | * Clean up any entries with the same name | |
1123 | */ | |
1124 | ||
1125 | list_for_each_entry(entry, &efivars->list, list) { | |
1126 | get_var_data_locked(efivars, &entry->var); | |
1127 | ||
c475594d MW |
1128 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
1129 | continue; | |
1130 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
1131 | utf16_strlen(efi_name))) | |
1132 | continue; | |
1133 | /* Needs to be a prefix */ | |
1134 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) | |
1135 | continue; | |
1136 | ||
1137 | /* found */ | |
1138 | found = entry; | |
7644c16c MW |
1139 | efivars->ops->set_variable(entry->var.VariableName, |
1140 | &entry->var.VendorGuid, | |
1141 | PSTORE_EFI_ATTRIBUTES, | |
c475594d | 1142 | 0, NULL); |
5ee9c198 MG |
1143 | } |
1144 | ||
1145 | if (found) | |
1146 | list_del(&found->list); | |
1147 | ||
1148 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1149 | efi_name[i] = name[i]; | |
1150 | ||
7644c16c | 1151 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1152 | size, psi->buf); |
1153 | ||
1154 | spin_unlock(&efivars->lock); | |
1155 | ||
1156 | if (found) | |
1157 | efivar_unregister(found); | |
1158 | ||
1159 | if (size) | |
b238b8fa | 1160 | ret = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1161 | utf16_strsize(efi_name, |
1162 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
1163 | efi_name, &vendor); |
1164 | ||
b238b8fa CG |
1165 | *id = part; |
1166 | return ret; | |
5ee9c198 MG |
1167 | }; |
1168 | ||
1169 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
1170 | struct pstore_info *psi) | |
1171 | { | |
3d6d8d20 | 1172 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
5ee9c198 MG |
1173 | |
1174 | return 0; | |
1175 | } | |
1176 | #else | |
1177 | static int efi_pstore_open(struct pstore_info *psi) | |
1178 | { | |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static int efi_pstore_close(struct pstore_info *psi) | |
1183 | { | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
eee628da CF |
1188 | struct timespec *timespec, |
1189 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1190 | { |
1191 | return -1; | |
1192 | } | |
1193 | ||
3d6d8d20 KC |
1194 | static int efi_pstore_write(enum pstore_type_id type, |
1195 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 1196 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
1197 | { |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
1202 | struct pstore_info *psi) | |
1203 | { | |
1204 | return 0; | |
1205 | } | |
1206 | #endif | |
1207 | ||
1208 | static struct pstore_info efi_pstore_info = { | |
1209 | .owner = THIS_MODULE, | |
1210 | .name = "efi", | |
1211 | .open = efi_pstore_open, | |
1212 | .close = efi_pstore_close, | |
1213 | .read = efi_pstore_read, | |
1214 | .write = efi_pstore_write, | |
1215 | .erase = efi_pstore_erase, | |
1216 | }; | |
1da177e4 | 1217 | |
2c3c8bea | 1218 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1219 | struct bin_attribute *bin_attr, |
1220 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1221 | { |
1222 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1223 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1224 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1225 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1226 | efi_status_t status = EFI_NOT_FOUND; |
1227 | int found = 0; | |
1228 | ||
1229 | if (!capable(CAP_SYS_ADMIN)) | |
1230 | return -EACCES; | |
1231 | ||
fec6c20b MG |
1232 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1233 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1234 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | ||
29422693 | 1238 | spin_lock(&efivars->lock); |
1da177e4 LT |
1239 | |
1240 | /* | |
1241 | * Does this variable already exist? | |
1242 | */ | |
29422693 | 1243 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1244 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1245 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1246 | if (strsize1 == strsize2 && |
1247 | !memcmp(&(search_efivar->var.VariableName), | |
1248 | new_var->VariableName, strsize1) && | |
1249 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1250 | new_var->VendorGuid)) { | |
1251 | found = 1; | |
1252 | break; | |
1253 | } | |
1254 | } | |
1255 | if (found) { | |
29422693 | 1256 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1257 | return -EINVAL; |
1258 | } | |
1259 | ||
1260 | /* now *really* create the variable via EFI */ | |
3295814d MW |
1261 | status = efivars->ops->set_variable(new_var->VariableName, |
1262 | &new_var->VendorGuid, | |
1263 | new_var->Attributes, | |
1264 | new_var->DataSize, | |
1265 | new_var->Data); | |
1da177e4 LT |
1266 | |
1267 | if (status != EFI_SUCCESS) { | |
1268 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1269 | status); | |
29422693 | 1270 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1271 | return -EIO; |
1272 | } | |
29422693 | 1273 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1274 | |
1275 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1276 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1277 | utf16_strsize(new_var->VariableName, |
1278 | 1024), | |
4142ef14 MW |
1279 | new_var->VariableName, |
1280 | &new_var->VendorGuid); | |
1da177e4 LT |
1281 | if (status) { |
1282 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1283 | } | |
1284 | return count; | |
1285 | } | |
1286 | ||
2c3c8bea | 1287 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1288 | struct bin_attribute *bin_attr, |
1289 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1290 | { |
1291 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1292 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1293 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1294 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1295 | efi_status_t status = EFI_NOT_FOUND; |
1296 | int found = 0; | |
1297 | ||
1298 | if (!capable(CAP_SYS_ADMIN)) | |
1299 | return -EACCES; | |
1300 | ||
29422693 | 1301 | spin_lock(&efivars->lock); |
1da177e4 LT |
1302 | |
1303 | /* | |
1304 | * Does this variable already exist? | |
1305 | */ | |
29422693 | 1306 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1307 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1308 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1309 | if (strsize1 == strsize2 && |
1310 | !memcmp(&(search_efivar->var.VariableName), | |
1311 | del_var->VariableName, strsize1) && | |
1312 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1313 | del_var->VendorGuid)) { | |
1314 | found = 1; | |
1315 | break; | |
1316 | } | |
1317 | } | |
1318 | if (!found) { | |
29422693 | 1319 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1320 | return -EINVAL; |
1321 | } | |
1322 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1323 | del_var->Attributes = 0; | |
1324 | del_var->DataSize = 0; | |
1325 | ||
3295814d MW |
1326 | status = efivars->ops->set_variable(del_var->VariableName, |
1327 | &del_var->VendorGuid, | |
1328 | del_var->Attributes, | |
1329 | del_var->DataSize, | |
1330 | del_var->Data); | |
1da177e4 LT |
1331 | |
1332 | if (status != EFI_SUCCESS) { | |
1333 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1334 | status); | |
29422693 | 1335 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1336 | return -EIO; |
1337 | } | |
496a0fc8 | 1338 | list_del(&search_efivar->list); |
1da177e4 | 1339 | /* We need to release this lock before unregistering. */ |
29422693 | 1340 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1341 | efivar_unregister(search_efivar); |
1342 | ||
1343 | /* It's dead Jim.... */ | |
1344 | return count; | |
1345 | } | |
1346 | ||
1da177e4 LT |
1347 | /* |
1348 | * Let's not leave out systab information that snuck into | |
1349 | * the efivars driver | |
1350 | */ | |
334c6307 GKH |
1351 | static ssize_t systab_show(struct kobject *kobj, |
1352 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1353 | { |
1354 | char *str = buf; | |
1355 | ||
334c6307 | 1356 | if (!kobj || !buf) |
1da177e4 LT |
1357 | return -EINVAL; |
1358 | ||
b2c99e3c BH |
1359 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1360 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1361 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1362 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1363 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1364 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1365 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1366 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1367 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1368 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1369 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1370 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1371 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1372 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1373 | |
1374 | return str - buf; | |
1375 | } | |
1376 | ||
334c6307 GKH |
1377 | static struct kobj_attribute efi_attr_systab = |
1378 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1379 | |
334c6307 GKH |
1380 | static struct attribute *efi_subsys_attrs[] = { |
1381 | &efi_attr_systab.attr, | |
1da177e4 LT |
1382 | NULL, /* maybe more in the future? */ |
1383 | }; | |
1384 | ||
334c6307 GKH |
1385 | static struct attribute_group efi_subsys_attr_group = { |
1386 | .attrs = efi_subsys_attrs, | |
1387 | }; | |
1388 | ||
bc87d2fe | 1389 | static struct kobject *efi_kobj; |
1da177e4 LT |
1390 | |
1391 | /* | |
1392 | * efivar_create_sysfs_entry() | |
1393 | * Requires: | |
1394 | * variable_name_size = number of bytes required to hold | |
1395 | * variable_name (not counting the NULL | |
1396 | * character at the end. | |
29422693 | 1397 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1398 | * Returns 1 on failure, 0 on success |
1399 | */ | |
1400 | static int | |
4142ef14 MW |
1401 | efivar_create_sysfs_entry(struct efivars *efivars, |
1402 | unsigned long variable_name_size, | |
1403 | efi_char16_t *variable_name, | |
1404 | efi_guid_t *vendor_guid) | |
1da177e4 LT |
1405 | { |
1406 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | |
1407 | char *short_name; | |
1408 | struct efivar_entry *new_efivar; | |
1409 | ||
9c215384 DS |
1410 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
1411 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
1da177e4 LT |
1412 | |
1413 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1414 | kfree(short_name); |
1415 | kfree(new_efivar); | |
1da177e4 LT |
1416 | return 1; |
1417 | } | |
1da177e4 | 1418 | |
4142ef14 | 1419 | new_efivar->efivars = efivars; |
1da177e4 LT |
1420 | memcpy(new_efivar->var.VariableName, variable_name, |
1421 | variable_name_size); | |
1422 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1423 | ||
1424 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1425 | ala UTF-8 */ | |
1426 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1427 | short_name[i] = variable_name[i] & 0xFF; | |
1428 | } | |
1429 | /* This is ugly, but necessary to separate one vendor's | |
1430 | private variables from another's. */ | |
1431 | ||
1432 | *(short_name + strlen(short_name)) = '-'; | |
1433 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1434 | ||
29422693 | 1435 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1436 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1437 | "%s", short_name); | |
69b2186c JG |
1438 | if (i) { |
1439 | kfree(short_name); | |
1440 | kfree(new_efivar); | |
1441 | return 1; | |
1442 | } | |
1da177e4 | 1443 | |
d6d292c4 | 1444 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1445 | kfree(short_name); |
1446 | short_name = NULL; | |
1da177e4 | 1447 | |
29422693 MW |
1448 | spin_lock(&efivars->lock); |
1449 | list_add(&new_efivar->list, &efivars->list); | |
1450 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
1451 | |
1452 | return 0; | |
1453 | } | |
d502fbb0 MW |
1454 | |
1455 | static int | |
1456 | create_efivars_bin_attributes(struct efivars *efivars) | |
1457 | { | |
1458 | struct bin_attribute *attr; | |
1459 | int error; | |
1460 | ||
1461 | /* new_var */ | |
1462 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1463 | if (!attr) | |
1464 | return -ENOMEM; | |
1465 | ||
1466 | attr->attr.name = "new_var"; | |
1467 | attr->attr.mode = 0200; | |
1468 | attr->write = efivar_create; | |
1469 | attr->private = efivars; | |
1470 | efivars->new_var = attr; | |
1471 | ||
1472 | /* del_var */ | |
1473 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1474 | if (!attr) { | |
1475 | error = -ENOMEM; | |
1476 | goto out_free; | |
1477 | } | |
1478 | attr->attr.name = "del_var"; | |
1479 | attr->attr.mode = 0200; | |
1480 | attr->write = efivar_delete; | |
1481 | attr->private = efivars; | |
1482 | efivars->del_var = attr; | |
1483 | ||
1484 | sysfs_bin_attr_init(efivars->new_var); | |
1485 | sysfs_bin_attr_init(efivars->del_var); | |
1486 | ||
1487 | /* Register */ | |
1488 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1489 | efivars->new_var); | |
1490 | if (error) { | |
1491 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1492 | " due to error %d\n", error); | |
1493 | goto out_free; | |
1494 | } | |
1495 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1496 | efivars->del_var); | |
1497 | if (error) { | |
1498 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1499 | " due to error %d\n", error); | |
1500 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1501 | efivars->new_var); | |
1502 | goto out_free; | |
1503 | } | |
1504 | ||
1505 | return 0; | |
1506 | out_free: | |
051d51bc DC |
1507 | kfree(efivars->del_var); |
1508 | efivars->del_var = NULL; | |
d502fbb0 MW |
1509 | kfree(efivars->new_var); |
1510 | efivars->new_var = NULL; | |
1511 | return error; | |
1512 | } | |
1513 | ||
4fc756bd | 1514 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1515 | { |
1516 | struct efivar_entry *entry, *n; | |
4142ef14 | 1517 | |
76b53f7c MW |
1518 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
1519 | spin_lock(&efivars->lock); | |
1520 | list_del(&entry->list); | |
1521 | spin_unlock(&efivars->lock); | |
1522 | efivar_unregister(entry); | |
1523 | } | |
1524 | if (efivars->new_var) | |
1525 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1526 | if (efivars->del_var) | |
1527 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1528 | kfree(efivars->new_var); | |
1529 | kfree(efivars->del_var); | |
1530 | kset_unregister(efivars->kset); | |
1531 | } | |
4fc756bd | 1532 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1533 | |
4fc756bd MW |
1534 | int register_efivars(struct efivars *efivars, |
1535 | const struct efivar_operations *ops, | |
1536 | struct kobject *parent_kobj) | |
1da177e4 LT |
1537 | { |
1538 | efi_status_t status = EFI_NOT_FOUND; | |
1539 | efi_guid_t vendor_guid; | |
1540 | efi_char16_t *variable_name; | |
1da177e4 | 1541 | unsigned long variable_name_size = 1024; |
334c6307 | 1542 | int error = 0; |
1da177e4 | 1543 | |
9c215384 | 1544 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1545 | if (!variable_name) { |
1546 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1547 | return -ENOMEM; | |
1548 | } | |
1549 | ||
29422693 MW |
1550 | spin_lock_init(&efivars->lock); |
1551 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1552 | efivars->ops = ops; |
29422693 | 1553 | |
76b53f7c | 1554 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1555 | if (!efivars->kset) { |
66ac831e GKH |
1556 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1557 | error = -ENOMEM; | |
76b53f7c | 1558 | goto out; |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | /* | |
1562 | * Per EFI spec, the maximum storage allocated for both | |
1563 | * the variable name and variable data is 1024 bytes. | |
1564 | */ | |
1565 | ||
1566 | do { | |
1567 | variable_name_size = 1024; | |
1568 | ||
3295814d | 1569 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
1570 | variable_name, |
1571 | &vendor_guid); | |
1572 | switch (status) { | |
1573 | case EFI_SUCCESS: | |
4142ef14 MW |
1574 | efivar_create_sysfs_entry(efivars, |
1575 | variable_name_size, | |
1576 | variable_name, | |
1577 | &vendor_guid); | |
1da177e4 LT |
1578 | break; |
1579 | case EFI_NOT_FOUND: | |
1580 | break; | |
1581 | default: | |
1582 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
1583 | status); | |
1584 | status = EFI_NOT_FOUND; | |
1585 | break; | |
1586 | } | |
1587 | } while (status != EFI_NOT_FOUND); | |
1588 | ||
d502fbb0 | 1589 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 1590 | if (error) |
76b53f7c | 1591 | unregister_efivars(efivars); |
1da177e4 | 1592 | |
5ee9c198 MG |
1593 | efivars->efi_pstore_info = efi_pstore_info; |
1594 | ||
1595 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1596 | if (efivars->efi_pstore_info.buf) { | |
1597 | efivars->efi_pstore_info.bufsize = 1024; | |
1598 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 1599 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
1600 | pstore_register(&efivars->efi_pstore_info); |
1601 | } | |
1602 | ||
5d9db883 MG |
1603 | register_filesystem(&efivarfs_type); |
1604 | ||
76b53f7c MW |
1605 | out: |
1606 | kfree(variable_name); | |
1da177e4 | 1607 | |
76b53f7c MW |
1608 | return error; |
1609 | } | |
4fc756bd | 1610 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 1611 | |
76b53f7c MW |
1612 | /* |
1613 | * For now we register the efi subsystem with the firmware subsystem | |
1614 | * and the vars subsystem with the efi subsystem. In the future, it | |
1615 | * might make sense to split off the efi subsystem into its own | |
1616 | * driver, but for now only efivars will register with it, so just | |
1617 | * include it here. | |
1618 | */ | |
1619 | ||
1620 | static int __init | |
1621 | efivars_init(void) | |
1622 | { | |
1623 | int error = 0; | |
1624 | ||
1625 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1626 | EFIVARS_DATE); | |
1627 | ||
1628 | if (!efi_enabled) | |
4fc756bd | 1629 | return 0; |
76b53f7c MW |
1630 | |
1631 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1632 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1633 | if (!efi_kobj) { | |
1634 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1635 | return -ENOMEM; | |
1636 | } | |
1637 | ||
3295814d MW |
1638 | ops.get_variable = efi.get_variable; |
1639 | ops.set_variable = efi.set_variable; | |
1640 | ops.get_next_variable = efi.get_next_variable; | |
1641 | error = register_efivars(&__efivars, &ops, efi_kobj); | |
3116aabc DC |
1642 | if (error) |
1643 | goto err_put; | |
76b53f7c MW |
1644 | |
1645 | /* Don't forget the systab entry */ | |
1646 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1647 | if (error) { | |
1648 | printk(KERN_ERR | |
1649 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1650 | error); | |
3116aabc | 1651 | goto err_unregister; |
76b53f7c | 1652 | } |
1da177e4 | 1653 | |
3116aabc DC |
1654 | return 0; |
1655 | ||
1656 | err_unregister: | |
1657 | unregister_efivars(&__efivars); | |
1658 | err_put: | |
1659 | kobject_put(efi_kobj); | |
1da177e4 LT |
1660 | return error; |
1661 | } | |
1662 | ||
1663 | static void __exit | |
1664 | efivars_exit(void) | |
1665 | { | |
aabb6e15 RD |
1666 | if (efi_enabled) { |
1667 | unregister_efivars(&__efivars); | |
1668 | kobject_put(efi_kobj); | |
1669 | } | |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | module_init(efivars_init); | |
1673 | module_exit(efivars_exit); | |
1674 |