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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> |
47f531e8 | 82 | #include <linux/ctype.h> |
1da177e4 | 83 | |
5d9db883 MG |
84 | #include <linux/fs.h> |
85 | #include <linux/ramfs.h> | |
86 | #include <linux/pagemap.h> | |
87 | ||
1da177e4 LT |
88 | #include <asm/uaccess.h> |
89 | ||
90 | #define EFIVARS_VERSION "0.08" | |
91 | #define EFIVARS_DATE "2004-May-17" | |
92 | ||
93 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
94 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
95 | MODULE_LICENSE("GPL"); | |
96 | MODULE_VERSION(EFIVARS_VERSION); | |
97 | ||
5ee9c198 MG |
98 | #define DUMP_NAME_LEN 52 |
99 | ||
310ad754 JK |
100 | /* |
101 | * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")) | |
102 | * not including trailing NUL | |
103 | */ | |
104 | #define GUID_LEN 36 | |
5ee9c198 | 105 | |
ec0971ba | 106 | static bool efivars_pstore_disable = |
ca0ba26f | 107 | IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE); |
ec0971ba SF |
108 | |
109 | module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644); | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * The maximum size of VariableName + Data = 1024 | |
113 | * Therefore, it's reasonable to save that much | |
114 | * space in each part of the structure, | |
115 | * and we use a page for reading/writing. | |
116 | */ | |
117 | ||
118 | struct efi_variable { | |
119 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
120 | efi_guid_t VendorGuid; | |
121 | unsigned long DataSize; | |
122 | __u8 Data[1024]; | |
123 | efi_status_t Status; | |
124 | __u32 Attributes; | |
125 | } __attribute__((packed)); | |
126 | ||
1da177e4 | 127 | struct efivar_entry { |
4142ef14 | 128 | struct efivars *efivars; |
1da177e4 LT |
129 | struct efi_variable var; |
130 | struct list_head list; | |
131 | struct kobject kobj; | |
132 | }; | |
133 | ||
1da177e4 LT |
134 | struct efivar_attribute { |
135 | struct attribute attr; | |
136 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
137 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
138 | }; | |
139 | ||
5d9db883 MG |
140 | static struct efivars __efivars; |
141 | static struct efivar_operations ops; | |
142 | ||
7644c16c MW |
143 | #define PSTORE_EFI_ATTRIBUTES \ |
144 | (EFI_VARIABLE_NON_VOLATILE | \ | |
145 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
146 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 147 | |
1da177e4 LT |
148 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
149 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 150 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
151 | .show = _show, \ |
152 | .store = _store, \ | |
153 | }; | |
154 | ||
1da177e4 LT |
155 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
156 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
157 | ||
158 | /* | |
159 | * Prototype for sysfs creation function | |
160 | */ | |
161 | static int | |
4142ef14 MW |
162 | efivar_create_sysfs_entry(struct efivars *efivars, |
163 | unsigned long variable_name_size, | |
164 | efi_char16_t *variable_name, | |
165 | efi_guid_t *vendor_guid); | |
1da177e4 | 166 | |
a93bc0c6 SA |
167 | /* |
168 | * Prototype for workqueue functions updating sysfs entry | |
169 | */ | |
170 | ||
171 | static void efivar_update_sysfs_entries(struct work_struct *); | |
172 | static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries); | |
e971318b | 173 | static bool efivar_wq_enabled = true; |
a93bc0c6 | 174 | |
1da177e4 LT |
175 | /* Return the number of unicode characters in data */ |
176 | static unsigned long | |
a2940908 | 177 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
178 | { |
179 | unsigned long length = 0; | |
180 | ||
a2940908 | 181 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
182 | length++; |
183 | return length; | |
184 | } | |
185 | ||
b728a5c8 | 186 | static inline unsigned long |
a2940908 MW |
187 | utf16_strlen(efi_char16_t *s) |
188 | { | |
189 | return utf16_strnlen(s, ~0UL); | |
190 | } | |
191 | ||
1da177e4 LT |
192 | /* |
193 | * Return the number of bytes is the length of this string | |
194 | * Note: this is NOT the same as the number of unicode characters | |
195 | */ | |
196 | static inline unsigned long | |
a2940908 | 197 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 198 | { |
a2940908 | 199 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
200 | } |
201 | ||
828aa1f0 MW |
202 | static inline int |
203 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
204 | { | |
205 | while (1) { | |
206 | if (len == 0) | |
207 | return 0; | |
208 | if (*a < *b) | |
209 | return -1; | |
210 | if (*a > *b) | |
211 | return 1; | |
212 | if (*a == 0) /* implies *b == 0 */ | |
213 | return 0; | |
214 | a++; | |
215 | b++; | |
216 | len--; | |
217 | } | |
218 | } | |
219 | ||
fec6c20b | 220 | static bool |
54b3a4d3 MG |
221 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
222 | unsigned long len) | |
fec6c20b MG |
223 | { |
224 | struct efi_generic_dev_path *node; | |
225 | int offset = 0; | |
226 | ||
227 | node = (struct efi_generic_dev_path *)buffer; | |
228 | ||
54b3a4d3 MG |
229 | if (len < sizeof(*node)) |
230 | return false; | |
fec6c20b | 231 | |
54b3a4d3 MG |
232 | while (offset <= len - sizeof(*node) && |
233 | node->length >= sizeof(*node) && | |
234 | node->length <= len - offset) { | |
235 | offset += node->length; | |
fec6c20b MG |
236 | |
237 | if ((node->type == EFI_DEV_END_PATH || | |
238 | node->type == EFI_DEV_END_PATH2) && | |
239 | node->sub_type == EFI_DEV_END_ENTIRE) | |
240 | return true; | |
241 | ||
242 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
243 | } | |
244 | ||
245 | /* | |
246 | * If we're here then either node->length pointed past the end | |
247 | * of the buffer or we reached the end of the buffer without | |
248 | * finding a device path end node. | |
249 | */ | |
250 | return false; | |
251 | } | |
252 | ||
253 | static bool | |
54b3a4d3 MG |
254 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
255 | unsigned long len) | |
fec6c20b MG |
256 | { |
257 | /* An array of 16-bit integers */ | |
258 | if ((len % 2) != 0) | |
259 | return false; | |
260 | ||
261 | return true; | |
262 | } | |
263 | ||
264 | static bool | |
54b3a4d3 MG |
265 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
266 | unsigned long len) | |
fec6c20b MG |
267 | { |
268 | u16 filepathlength; | |
54b3a4d3 MG |
269 | int i, desclength = 0, namelen; |
270 | ||
271 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
272 | |
273 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
274 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
275 | if (var->VariableName[i] > 127 || |
276 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
277 | return true; |
278 | } | |
279 | ||
54b3a4d3 MG |
280 | /* Reject it if there's 4 digits of hex and then further content */ |
281 | if (namelen > match + 4) | |
282 | return false; | |
283 | ||
284 | /* A valid entry must be at least 8 bytes */ | |
285 | if (len < 8) | |
fec6c20b MG |
286 | return false; |
287 | ||
288 | filepathlength = buffer[4] | buffer[5] << 8; | |
289 | ||
290 | /* | |
291 | * There's no stored length for the description, so it has to be | |
292 | * found by hand | |
293 | */ | |
54b3a4d3 | 294 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
295 | |
296 | /* Each boot entry must have a descriptor */ | |
297 | if (!desclength) | |
298 | return false; | |
299 | ||
300 | /* | |
301 | * If the sum of the length of the description, the claimed filepath | |
302 | * length and the original header are greater than the length of the | |
303 | * variable, it's malformed | |
304 | */ | |
305 | if ((desclength + filepathlength + 6) > len) | |
306 | return false; | |
307 | ||
308 | /* | |
309 | * And, finally, check the filepath | |
310 | */ | |
311 | return validate_device_path(var, match, buffer + desclength + 6, | |
312 | filepathlength); | |
313 | } | |
314 | ||
315 | static bool | |
54b3a4d3 MG |
316 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
317 | unsigned long len) | |
fec6c20b MG |
318 | { |
319 | /* A single 16-bit integer */ | |
320 | if (len != 2) | |
321 | return false; | |
322 | ||
323 | return true; | |
324 | } | |
325 | ||
326 | static bool | |
54b3a4d3 MG |
327 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
328 | unsigned long len) | |
fec6c20b MG |
329 | { |
330 | int i; | |
331 | ||
332 | for (i = 0; i < len; i++) { | |
333 | if (buffer[i] > 127) | |
334 | return false; | |
335 | ||
336 | if (buffer[i] == 0) | |
337 | return true; | |
338 | } | |
339 | ||
340 | return false; | |
341 | } | |
342 | ||
343 | struct variable_validate { | |
344 | char *name; | |
345 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 346 | unsigned long len); |
fec6c20b MG |
347 | }; |
348 | ||
349 | static const struct variable_validate variable_validate[] = { | |
350 | { "BootNext", validate_uint16 }, | |
351 | { "BootOrder", validate_boot_order }, | |
352 | { "DriverOrder", validate_boot_order }, | |
353 | { "Boot*", validate_load_option }, | |
354 | { "Driver*", validate_load_option }, | |
355 | { "ConIn", validate_device_path }, | |
356 | { "ConInDev", validate_device_path }, | |
357 | { "ConOut", validate_device_path }, | |
358 | { "ConOutDev", validate_device_path }, | |
359 | { "ErrOut", validate_device_path }, | |
360 | { "ErrOutDev", validate_device_path }, | |
361 | { "Timeout", validate_uint16 }, | |
362 | { "Lang", validate_ascii_string }, | |
363 | { "PlatformLang", validate_ascii_string }, | |
364 | { "", NULL }, | |
365 | }; | |
366 | ||
367 | static bool | |
54b3a4d3 | 368 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
369 | { |
370 | int i; | |
371 | u16 *unicode_name = var->VariableName; | |
372 | ||
373 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
374 | const char *name = variable_validate[i].name; | |
375 | int match; | |
376 | ||
377 | for (match = 0; ; match++) { | |
378 | char c = name[match]; | |
379 | u16 u = unicode_name[match]; | |
380 | ||
381 | /* All special variables are plain ascii */ | |
382 | if (u > 127) | |
383 | return true; | |
384 | ||
385 | /* Wildcard in the matching name means we've matched */ | |
386 | if (c == '*') | |
387 | return variable_validate[i].validate(var, | |
388 | match, data, len); | |
389 | ||
390 | /* Case sensitive match */ | |
391 | if (c != u) | |
392 | break; | |
393 | ||
394 | /* Reached the end of the string while matching */ | |
395 | if (!c) | |
396 | return variable_validate[i].validate(var, | |
397 | match, data, len); | |
398 | } | |
399 | } | |
400 | ||
401 | return true; | |
402 | } | |
403 | ||
1da177e4 | 404 | static efi_status_t |
5ee9c198 | 405 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
406 | { |
407 | efi_status_t status; | |
408 | ||
1da177e4 | 409 | var->DataSize = 1024; |
3295814d MW |
410 | status = efivars->ops->get_variable(var->VariableName, |
411 | &var->VendorGuid, | |
412 | &var->Attributes, | |
413 | &var->DataSize, | |
414 | var->Data); | |
5ee9c198 MG |
415 | return status; |
416 | } | |
417 | ||
418 | static efi_status_t | |
419 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
420 | { | |
421 | efi_status_t status; | |
81fa4e58 | 422 | unsigned long flags; |
5ee9c198 | 423 | |
81fa4e58 | 424 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 425 | status = get_var_data_locked(efivars, var); |
81fa4e58 | 426 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 427 | |
1da177e4 LT |
428 | if (status != EFI_SUCCESS) { |
429 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
430 | status); | |
431 | } | |
432 | return status; | |
433 | } | |
434 | ||
68d92986 MG |
435 | static efi_status_t |
436 | check_var_size_locked(struct efivars *efivars, u32 attributes, | |
437 | unsigned long size) | |
438 | { | |
68d92986 MG |
439 | const struct efivar_operations *fops = efivars->ops; |
440 | ||
a6e4d5a0 | 441 | if (!efivars->ops->query_variable_store) |
68d92986 MG |
442 | return EFI_UNSUPPORTED; |
443 | ||
a6e4d5a0 | 444 | return fops->query_variable_store(attributes, size); |
68d92986 MG |
445 | } |
446 | ||
447 | ||
448 | static efi_status_t | |
449 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
450 | { | |
451 | efi_status_t status; | |
452 | unsigned long flags; | |
453 | ||
454 | spin_lock_irqsave(&efivars->lock, flags); | |
455 | status = check_var_size_locked(efivars, attributes, size); | |
456 | spin_unlock_irqrestore(&efivars->lock, flags); | |
457 | ||
458 | return status; | |
459 | } | |
460 | ||
1da177e4 LT |
461 | static ssize_t |
462 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
463 | { | |
464 | struct efi_variable *var = &entry->var; | |
465 | char *str = buf; | |
466 | ||
467 | if (!entry || !buf) | |
468 | return 0; | |
469 | ||
470 | efi_guid_unparse(&var->VendorGuid, str); | |
471 | str += strlen(str); | |
472 | str += sprintf(str, "\n"); | |
473 | ||
474 | return str - buf; | |
475 | } | |
476 | ||
477 | static ssize_t | |
478 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
479 | { | |
480 | struct efi_variable *var = &entry->var; | |
481 | char *str = buf; | |
482 | efi_status_t status; | |
483 | ||
484 | if (!entry || !buf) | |
485 | return -EINVAL; | |
486 | ||
4142ef14 | 487 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
488 | if (status != EFI_SUCCESS) |
489 | return -EIO; | |
490 | ||
70839090 | 491 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 492 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 493 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 494 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 495 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 496 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
497 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
498 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
499 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
500 | str += sprintf(str, | |
501 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
502 | if (var->Attributes & | |
503 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
504 | str += sprintf(str, | |
505 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
506 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
507 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
508 | return str - buf; |
509 | } | |
510 | ||
511 | static ssize_t | |
512 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
513 | { | |
514 | struct efi_variable *var = &entry->var; | |
515 | char *str = buf; | |
516 | efi_status_t status; | |
517 | ||
518 | if (!entry || !buf) | |
519 | return -EINVAL; | |
520 | ||
4142ef14 | 521 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
522 | if (status != EFI_SUCCESS) |
523 | return -EIO; | |
524 | ||
525 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
526 | return str - buf; | |
527 | } | |
528 | ||
529 | static ssize_t | |
530 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
531 | { | |
532 | struct efi_variable *var = &entry->var; | |
533 | efi_status_t status; | |
534 | ||
535 | if (!entry || !buf) | |
536 | return -EINVAL; | |
537 | ||
4142ef14 | 538 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
539 | if (status != EFI_SUCCESS) |
540 | return -EIO; | |
541 | ||
542 | memcpy(buf, var->Data, var->DataSize); | |
543 | return var->DataSize; | |
544 | } | |
545 | /* | |
546 | * We allow each variable to be edited via rewriting the | |
547 | * entire efi variable structure. | |
548 | */ | |
549 | static ssize_t | |
550 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
551 | { | |
552 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 553 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
554 | efi_status_t status = EFI_NOT_FOUND; |
555 | ||
556 | if (count != sizeof(struct efi_variable)) | |
557 | return -EINVAL; | |
558 | ||
559 | new_var = (struct efi_variable *)buf; | |
560 | /* | |
561 | * If only updating the variable data, then the name | |
562 | * and guid should remain the same | |
563 | */ | |
564 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
565 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
566 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
570 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
571 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
fec6c20b MG |
575 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
576 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
577 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
81fa4e58 | 581 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
582 | |
583 | status = check_var_size_locked(efivars, new_var->Attributes, | |
584 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
585 | ||
586 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
587 | status = efivars->ops->set_variable(new_var->VariableName, | |
588 | &new_var->VendorGuid, | |
589 | new_var->Attributes, | |
590 | new_var->DataSize, | |
591 | new_var->Data); | |
1da177e4 | 592 | |
81fa4e58 | 593 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
594 | |
595 | if (status != EFI_SUCCESS) { | |
596 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
597 | status); | |
598 | return -EIO; | |
599 | } | |
600 | ||
601 | memcpy(&entry->var, new_var, count); | |
602 | return count; | |
603 | } | |
604 | ||
605 | static ssize_t | |
606 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
607 | { | |
608 | struct efi_variable *var = &entry->var; | |
609 | efi_status_t status; | |
610 | ||
611 | if (!entry || !buf) | |
612 | return 0; | |
613 | ||
4142ef14 | 614 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
615 | if (status != EFI_SUCCESS) |
616 | return -EIO; | |
617 | ||
618 | memcpy(buf, var, sizeof(*var)); | |
619 | return sizeof(*var); | |
620 | } | |
621 | ||
622 | /* | |
623 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 624 | * the attributes... |
1da177e4 LT |
625 | */ |
626 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
627 | char *buf) | |
628 | { | |
629 | struct efivar_entry *var = to_efivar_entry(kobj); | |
630 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 631 | ssize_t ret = -EIO; |
1da177e4 LT |
632 | |
633 | if (!capable(CAP_SYS_ADMIN)) | |
634 | return -EACCES; | |
635 | ||
636 | if (efivar_attr->show) { | |
637 | ret = efivar_attr->show(var, buf); | |
638 | } | |
639 | return ret; | |
640 | } | |
641 | ||
642 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
643 | const char *buf, size_t count) | |
644 | { | |
645 | struct efivar_entry *var = to_efivar_entry(kobj); | |
646 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 647 | ssize_t ret = -EIO; |
1da177e4 LT |
648 | |
649 | if (!capable(CAP_SYS_ADMIN)) | |
650 | return -EACCES; | |
651 | ||
652 | if (efivar_attr->store) | |
653 | ret = efivar_attr->store(var, buf, count); | |
654 | ||
655 | return ret; | |
656 | } | |
657 | ||
52cf25d0 | 658 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
659 | .show = efivar_attr_show, |
660 | .store = efivar_attr_store, | |
661 | }; | |
662 | ||
663 | static void efivar_release(struct kobject *kobj) | |
664 | { | |
665 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
666 | kfree(var); |
667 | } | |
668 | ||
669 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
670 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
671 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
672 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
673 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
674 | ||
675 | static struct attribute *def_attrs[] = { | |
676 | &efivar_attr_guid.attr, | |
677 | &efivar_attr_size.attr, | |
678 | &efivar_attr_attributes.attr, | |
679 | &efivar_attr_data.attr, | |
680 | &efivar_attr_raw_var.attr, | |
681 | NULL, | |
682 | }; | |
683 | ||
e89a4116 | 684 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
685 | .release = efivar_release, |
686 | .sysfs_ops = &efivar_attr_ops, | |
687 | .default_attrs = def_attrs, | |
688 | }; | |
689 | ||
1da177e4 LT |
690 | static inline void |
691 | efivar_unregister(struct efivar_entry *var) | |
692 | { | |
c10997f6 | 693 | kobject_put(&var->kobj); |
1da177e4 LT |
694 | } |
695 | ||
5d9db883 MG |
696 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
697 | { | |
698 | file->private_data = inode->i_private; | |
699 | return 0; | |
700 | } | |
701 | ||
7253eaba MF |
702 | static int efi_status_to_err(efi_status_t status) |
703 | { | |
704 | int err; | |
705 | ||
706 | switch (status) { | |
707 | case EFI_INVALID_PARAMETER: | |
708 | err = -EINVAL; | |
709 | break; | |
710 | case EFI_OUT_OF_RESOURCES: | |
711 | err = -ENOSPC; | |
712 | break; | |
713 | case EFI_DEVICE_ERROR: | |
714 | err = -EIO; | |
715 | break; | |
716 | case EFI_WRITE_PROTECTED: | |
717 | err = -EROFS; | |
718 | break; | |
719 | case EFI_SECURITY_VIOLATION: | |
720 | err = -EACCES; | |
721 | break; | |
722 | case EFI_NOT_FOUND: | |
1fa7e695 | 723 | err = -EIO; |
7253eaba MF |
724 | break; |
725 | default: | |
726 | err = -EINVAL; | |
727 | } | |
728 | ||
729 | return err; | |
730 | } | |
731 | ||
5d9db883 MG |
732 | static ssize_t efivarfs_file_write(struct file *file, |
733 | const char __user *userbuf, size_t count, loff_t *ppos) | |
734 | { | |
735 | struct efivar_entry *var = file->private_data; | |
736 | struct efivars *efivars; | |
737 | efi_status_t status; | |
738 | void *data; | |
739 | u32 attributes; | |
740 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 741 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 742 | unsigned long newdatasize, varsize; |
cfcf2f11 | 743 | ssize_t bytes = 0; |
5d9db883 MG |
744 | |
745 | if (count < sizeof(attributes)) | |
746 | return -EINVAL; | |
747 | ||
89d16665 MF |
748 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
749 | return -EFAULT; | |
5d9db883 | 750 | |
89d16665 MF |
751 | if (attributes & ~(EFI_VARIABLE_MASK)) |
752 | return -EINVAL; | |
5d9db883 MG |
753 | |
754 | efivars = var->efivars; | |
755 | ||
89d16665 MF |
756 | /* |
757 | * Ensure that the user can't allocate arbitrarily large | |
758 | * amounts of memory. Pick a default size of 64K if | |
759 | * QueryVariableInfo() isn't supported by the firmware. | |
760 | */ | |
89d16665 | 761 | |
68d92986 MG |
762 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
763 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
764 | |
765 | if (status != EFI_SUCCESS) { | |
766 | if (status != EFI_UNSUPPORTED) | |
767 | return efi_status_to_err(status); | |
768 | ||
68d92986 MG |
769 | if (datasize > 65536) |
770 | return -ENOSPC; | |
5d9db883 MG |
771 | } |
772 | ||
89d16665 MF |
773 | data = kmalloc(datasize, GFP_KERNEL); |
774 | if (!data) | |
775 | return -ENOMEM; | |
776 | ||
5d9db883 | 777 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 778 | bytes = -EFAULT; |
5d9db883 MG |
779 | goto out; |
780 | } | |
781 | ||
782 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 783 | bytes = -EINVAL; |
5d9db883 MG |
784 | goto out; |
785 | } | |
786 | ||
f5f6a60a JK |
787 | /* |
788 | * The lock here protects the get_variable call, the conditional | |
789 | * set_variable call, and removal of the variable from the efivars | |
790 | * list (in the case of an authenticated delete). | |
791 | */ | |
81fa4e58 | 792 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 793 | |
68d92986 MG |
794 | /* |
795 | * Ensure that the available space hasn't shrunk below the safe level | |
796 | */ | |
797 | ||
798 | status = check_var_size_locked(efivars, attributes, varsize); | |
799 | ||
800 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
801 | spin_unlock_irq(&efivars->lock); | |
802 | kfree(data); | |
803 | ||
804 | return efi_status_to_err(status); | |
805 | } | |
806 | ||
5d9db883 MG |
807 | status = efivars->ops->set_variable(var->var.VariableName, |
808 | &var->var.VendorGuid, | |
809 | attributes, datasize, | |
810 | data); | |
811 | ||
f5f6a60a | 812 | if (status != EFI_SUCCESS) { |
81fa4e58 | 813 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
814 | kfree(data); |
815 | ||
7253eaba | 816 | return efi_status_to_err(status); |
5d9db883 | 817 | } |
0c542edd | 818 | |
cfcf2f11 MF |
819 | bytes = count; |
820 | ||
0c542edd JK |
821 | /* |
822 | * Writing to the variable may have caused a change in size (which | |
823 | * could either be an append or an overwrite), or the variable to be | |
824 | * deleted. Perform a GetVariable() so we can tell what actually | |
825 | * happened. | |
826 | */ | |
827 | newdatasize = 0; | |
828 | status = efivars->ops->get_variable(var->var.VariableName, | |
829 | &var->var.VendorGuid, | |
830 | NULL, &newdatasize, | |
831 | NULL); | |
832 | ||
833 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 834 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
835 | mutex_lock(&inode->i_mutex); |
836 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
837 | mutex_unlock(&inode->i_mutex); | |
838 | ||
839 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 840 | list_del(&var->list); |
81fa4e58 | 841 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
842 | efivar_unregister(var); |
843 | drop_nlink(inode); | |
791eb564 | 844 | d_delete(file->f_dentry); |
0c542edd JK |
845 | dput(file->f_dentry); |
846 | ||
847 | } else { | |
81fa4e58 | 848 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
849 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
850 | "status = %lx\n", status); | |
851 | } | |
852 | ||
5d9db883 MG |
853 | out: |
854 | kfree(data); | |
855 | ||
cfcf2f11 | 856 | return bytes; |
5d9db883 MG |
857 | } |
858 | ||
859 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
860 | size_t count, loff_t *ppos) | |
861 | { | |
862 | struct efivar_entry *var = file->private_data; | |
863 | struct efivars *efivars = var->efivars; | |
864 | efi_status_t status; | |
865 | unsigned long datasize = 0; | |
866 | u32 attributes; | |
867 | void *data; | |
d142df03 | 868 | ssize_t size = 0; |
5d9db883 | 869 | |
81fa4e58 | 870 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
871 | status = efivars->ops->get_variable(var->var.VariableName, |
872 | &var->var.VendorGuid, | |
873 | &attributes, &datasize, NULL); | |
81fa4e58 | 874 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
875 | |
876 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 877 | return efi_status_to_err(status); |
5d9db883 | 878 | |
d2923841 | 879 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
880 | |
881 | if (!data) | |
7253eaba | 882 | return -ENOMEM; |
5d9db883 | 883 | |
81fa4e58 | 884 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
885 | status = efivars->ops->get_variable(var->var.VariableName, |
886 | &var->var.VendorGuid, | |
887 | &attributes, &datasize, | |
d2923841 | 888 | (data + sizeof(attributes))); |
81fa4e58 | 889 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 890 | |
7253eaba MF |
891 | if (status != EFI_SUCCESS) { |
892 | size = efi_status_to_err(status); | |
d142df03 | 893 | goto out_free; |
7253eaba | 894 | } |
5d9db883 | 895 | |
d2923841 | 896 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 897 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 898 | data, datasize + sizeof(attributes)); |
d142df03 | 899 | out_free: |
5d9db883 MG |
900 | kfree(data); |
901 | ||
902 | return size; | |
903 | } | |
904 | ||
905 | static void efivarfs_evict_inode(struct inode *inode) | |
906 | { | |
907 | clear_inode(inode); | |
908 | } | |
909 | ||
910 | static const struct super_operations efivarfs_ops = { | |
911 | .statfs = simple_statfs, | |
912 | .drop_inode = generic_delete_inode, | |
913 | .evict_inode = efivarfs_evict_inode, | |
914 | .show_options = generic_show_options, | |
915 | }; | |
916 | ||
917 | static struct super_block *efivarfs_sb; | |
918 | ||
919 | static const struct inode_operations efivarfs_dir_inode_operations; | |
920 | ||
921 | static const struct file_operations efivarfs_file_operations = { | |
922 | .open = efivarfs_file_open, | |
923 | .read = efivarfs_file_read, | |
924 | .write = efivarfs_file_write, | |
925 | .llseek = no_llseek, | |
926 | }; | |
927 | ||
928 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
929 | const struct inode *dir, int mode, dev_t dev) | |
930 | { | |
931 | struct inode *inode = new_inode(sb); | |
932 | ||
933 | if (inode) { | |
934 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
935 | inode->i_mode = mode; |
936 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
937 | switch (mode & S_IFMT) { | |
938 | case S_IFREG: | |
939 | inode->i_fop = &efivarfs_file_operations; | |
940 | break; | |
941 | case S_IFDIR: | |
942 | inode->i_op = &efivarfs_dir_inode_operations; | |
943 | inode->i_fop = &simple_dir_operations; | |
944 | inc_nlink(inode); | |
945 | break; | |
946 | } | |
947 | } | |
948 | return inode; | |
949 | } | |
950 | ||
47f531e8 MF |
951 | /* |
952 | * Return true if 'str' is a valid efivarfs filename of the form, | |
953 | * | |
954 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
955 | */ | |
956 | static bool efivarfs_valid_name(const char *str, int len) | |
957 | { | |
958 | static const char dashes[GUID_LEN] = { | |
959 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
960 | }; | |
961 | const char *s = str + len - GUID_LEN; | |
962 | int i; | |
963 | ||
964 | /* | |
965 | * We need a GUID, plus at least one letter for the variable name, | |
966 | * plus the '-' separator | |
967 | */ | |
968 | if (len < GUID_LEN + 2) | |
969 | return false; | |
970 | ||
123abd76 MF |
971 | /* GUID must be preceded by a '-' */ |
972 | if (*(s - 1) != '-') | |
47f531e8 MF |
973 | return false; |
974 | ||
975 | /* | |
976 | * Validate that 's' is of the correct format, e.g. | |
977 | * | |
978 | * 12345678-1234-1234-1234-123456789abc | |
979 | */ | |
980 | for (i = 0; i < GUID_LEN; i++) { | |
981 | if (dashes[i]) { | |
982 | if (*s++ != '-') | |
983 | return false; | |
984 | } else { | |
985 | if (!isxdigit(*s++)) | |
986 | return false; | |
987 | } | |
988 | } | |
989 | ||
990 | return true; | |
991 | } | |
992 | ||
5d9db883 MG |
993 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
994 | { | |
995 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
996 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
997 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
998 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
999 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
1000 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
1001 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
1002 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
1003 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
1004 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
1005 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
1006 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
1007 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1008 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1009 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1010 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1011 | } | |
1012 | ||
1013 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1014 | umode_t mode, bool excl) | |
1015 | { | |
45a937a8 | 1016 | struct inode *inode; |
5d9db883 MG |
1017 | struct efivars *efivars = &__efivars; |
1018 | struct efivar_entry *var; | |
1019 | int namelen, i = 0, err = 0; | |
1020 | ||
47f531e8 | 1021 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1022 | return -EINVAL; |
1023 | ||
45a937a8 | 1024 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1025 | if (!inode) |
aeeaa8d4 | 1026 | return -ENOMEM; |
5d9db883 MG |
1027 | |
1028 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1029 | if (!var) { |
1030 | err = -ENOMEM; | |
1031 | goto out; | |
1032 | } | |
5d9db883 | 1033 | |
310ad754 JK |
1034 | /* length of the variable name itself: remove GUID and separator */ |
1035 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1036 | |
1037 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1038 | &var->var.VendorGuid); | |
1039 | ||
1040 | for (i = 0; i < namelen; i++) | |
1041 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1042 | ||
1043 | var->var.VariableName[i] = '\0'; | |
1044 | ||
1045 | inode->i_private = var; | |
1046 | var->efivars = efivars; | |
1047 | var->kobj.kset = efivars->kset; | |
1048 | ||
1049 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1050 | dentry->d_name.name); | |
1051 | if (err) | |
1052 | goto out; | |
1053 | ||
1054 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1055 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1056 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1057 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1058 | d_instantiate(dentry, inode); |
1059 | dget(dentry); | |
1060 | out: | |
45a937a8 | 1061 | if (err) { |
5d9db883 | 1062 | kfree(var); |
45a937a8 AW |
1063 | iput(inode); |
1064 | } | |
5d9db883 MG |
1065 | return err; |
1066 | } | |
1067 | ||
1068 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1069 | { | |
1070 | struct efivar_entry *var = dentry->d_inode->i_private; | |
1071 | struct efivars *efivars = var->efivars; | |
1072 | efi_status_t status; | |
1073 | ||
81fa4e58 | 1074 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1075 | |
1076 | status = efivars->ops->set_variable(var->var.VariableName, | |
1077 | &var->var.VendorGuid, | |
1078 | 0, 0, NULL); | |
1079 | ||
1080 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1081 | list_del(&var->list); | |
81fa4e58 | 1082 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1083 | efivar_unregister(var); |
de5fe955 | 1084 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1085 | dput(dentry); |
1086 | return 0; | |
1087 | } | |
1088 | ||
81fa4e58 | 1089 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1090 | return -EINVAL; |
1091 | }; | |
1092 | ||
da27a243 MF |
1093 | /* |
1094 | * Compare two efivarfs file names. | |
1095 | * | |
1096 | * An efivarfs filename is composed of two parts, | |
1097 | * | |
1098 | * 1. A case-sensitive variable name | |
1099 | * 2. A case-insensitive GUID | |
1100 | * | |
1101 | * So we need to perform a case-sensitive match on part 1 and a | |
1102 | * case-insensitive match on part 2. | |
1103 | */ | |
1104 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1105 | const struct dentry *dentry, const struct inode *inode, | |
1106 | unsigned int len, const char *str, | |
1107 | const struct qstr *name) | |
1108 | { | |
1109 | int guid = len - GUID_LEN; | |
1110 | ||
1111 | if (name->len != len) | |
1112 | return 1; | |
1113 | ||
1114 | /* Case-sensitive compare for the variable name */ | |
1115 | if (memcmp(str, name->name, guid)) | |
1116 | return 1; | |
1117 | ||
1118 | /* Case-insensitive compare for the GUID */ | |
1119 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1120 | } | |
1121 | ||
1122 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1123 | const struct inode *inode, struct qstr *qstr) | |
1124 | { | |
1125 | unsigned long hash = init_name_hash(); | |
1126 | const unsigned char *s = qstr->name; | |
1127 | unsigned int len = qstr->len; | |
1128 | ||
1129 | if (!efivarfs_valid_name(s, len)) | |
1130 | return -EINVAL; | |
1131 | ||
1132 | while (len-- > GUID_LEN) | |
1133 | hash = partial_name_hash(*s++, hash); | |
1134 | ||
1135 | /* GUID is case-insensitive. */ | |
1136 | while (len--) | |
1137 | hash = partial_name_hash(tolower(*s++), hash); | |
1138 | ||
1139 | qstr->hash = end_name_hash(hash); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1145 | * memory and lookup time: arrange for them to be deleted immediately. | |
1146 | */ | |
1147 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1148 | { | |
1149 | return 1; | |
1150 | } | |
1151 | ||
1152 | static struct dentry_operations efivarfs_d_ops = { | |
1153 | .d_compare = efivarfs_d_compare, | |
1154 | .d_hash = efivarfs_d_hash, | |
1155 | .d_delete = efivarfs_delete_dentry, | |
1156 | }; | |
1157 | ||
1158 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1159 | { | |
feff5dc4 | 1160 | struct dentry *d; |
da27a243 | 1161 | struct qstr q; |
feff5dc4 | 1162 | int err; |
da27a243 MF |
1163 | |
1164 | q.name = name; | |
1165 | q.len = strlen(name); | |
1166 | ||
feff5dc4 MF |
1167 | err = efivarfs_d_hash(NULL, NULL, &q); |
1168 | if (err) | |
1169 | return ERR_PTR(err); | |
1170 | ||
1171 | d = d_alloc(parent, &q); | |
1172 | if (d) | |
1173 | return d; | |
da27a243 | 1174 | |
feff5dc4 | 1175 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1176 | } |
1177 | ||
e83af1f1 | 1178 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1179 | { |
1180 | struct inode *inode = NULL; | |
1181 | struct dentry *root; | |
1182 | struct efivar_entry *entry, *n; | |
1183 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1184 | char *name; |
feff5dc4 | 1185 | int err = -ENOMEM; |
5d9db883 MG |
1186 | |
1187 | efivarfs_sb = sb; | |
1188 | ||
1189 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1190 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1191 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1192 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1193 | sb->s_op = &efivarfs_ops; |
da27a243 | 1194 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1195 | sb->s_time_gran = 1; |
1196 | ||
1197 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1198 | if (!inode) |
1199 | return -ENOMEM; | |
5d9db883 MG |
1200 | inode->i_op = &efivarfs_dir_inode_operations; |
1201 | ||
1202 | root = d_make_root(inode); | |
1203 | sb->s_root = root; | |
5c9b50ab AW |
1204 | if (!root) |
1205 | return -ENOMEM; | |
5d9db883 MG |
1206 | |
1207 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1208 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1209 | unsigned long size = 0; |
1210 | int len, i; | |
1211 | ||
5ba6e291 AW |
1212 | inode = NULL; |
1213 | ||
5d9db883 MG |
1214 | len = utf16_strlen(entry->var.VariableName); |
1215 | ||
310ad754 JK |
1216 | /* name, plus '-', plus GUID, plus NUL*/ |
1217 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1218 | if (!name) |
1219 | goto fail; | |
5d9db883 MG |
1220 | |
1221 | for (i = 0; i < len; i++) | |
1222 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1223 | ||
1224 | name[len] = '-'; | |
1225 | ||
1226 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1227 | ||
310ad754 | 1228 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1229 | |
1230 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1231 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1232 | if (!inode) |
1233 | goto fail_name; | |
1234 | ||
da27a243 | 1235 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1236 | if (IS_ERR(dentry)) { |
1237 | err = PTR_ERR(dentry); | |
5ba6e291 | 1238 | goto fail_inode; |
feff5dc4 | 1239 | } |
5ba6e291 | 1240 | |
c0359db1 AW |
1241 | /* copied by the above to local storage in the dentry. */ |
1242 | kfree(name); | |
5d9db883 | 1243 | |
81fa4e58 | 1244 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1245 | efivars->ops->get_variable(entry->var.VariableName, |
1246 | &entry->var.VendorGuid, | |
1247 | &entry->var.Attributes, | |
1248 | &size, | |
1249 | NULL); | |
81fa4e58 | 1250 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1251 | |
1252 | mutex_lock(&inode->i_mutex); | |
1253 | inode->i_private = entry; | |
94a193fb | 1254 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1255 | mutex_unlock(&inode->i_mutex); |
1256 | d_add(dentry, inode); | |
1257 | } | |
1258 | ||
1259 | return 0; | |
5ba6e291 AW |
1260 | |
1261 | fail_inode: | |
1262 | iput(inode); | |
1263 | fail_name: | |
1264 | kfree(name); | |
1265 | fail: | |
feff5dc4 | 1266 | return err; |
5d9db883 MG |
1267 | } |
1268 | ||
1269 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1270 | int flags, const char *dev_name, void *data) | |
1271 | { | |
1272 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1273 | } | |
1274 | ||
1275 | static void efivarfs_kill_sb(struct super_block *sb) | |
1276 | { | |
1277 | kill_litter_super(sb); | |
1278 | efivarfs_sb = NULL; | |
1279 | } | |
1280 | ||
1281 | static struct file_system_type efivarfs_type = { | |
1282 | .name = "efivarfs", | |
1283 | .mount = efivarfs_mount, | |
1284 | .kill_sb = efivarfs_kill_sb, | |
1285 | }; | |
7f78e035 | 1286 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1287 | |
da27a243 MF |
1288 | /* |
1289 | * Handle negative dentry. | |
1290 | */ | |
1291 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1292 | unsigned int flags) | |
1293 | { | |
1294 | if (dentry->d_name.len > NAME_MAX) | |
1295 | return ERR_PTR(-ENAMETOOLONG); | |
1296 | d_add(dentry, NULL); | |
1297 | return NULL; | |
1298 | } | |
1299 | ||
5d9db883 | 1300 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1301 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1302 | .unlink = efivarfs_unlink, |
1303 | .create = efivarfs_create, | |
1304 | }; | |
1305 | ||
ed9dc8ce | 1306 | #ifdef CONFIG_EFI_VARS_PSTORE |
5ee9c198 MG |
1307 | |
1308 | static int efi_pstore_open(struct pstore_info *psi) | |
1309 | { | |
1310 | struct efivars *efivars = psi->data; | |
1311 | ||
81fa4e58 | 1312 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1313 | efivars->walk_entry = list_first_entry(&efivars->list, |
1314 | struct efivar_entry, list); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | static int efi_pstore_close(struct pstore_info *psi) | |
1319 | { | |
1320 | struct efivars *efivars = psi->data; | |
1321 | ||
81fa4e58 | 1322 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1323 | return 0; |
1324 | } | |
1325 | ||
1326 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1327 | int *count, struct timespec *timespec, |
f6f82851 | 1328 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1329 | { |
1330 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1331 | struct efivars *efivars = psi->data; | |
1332 | char name[DUMP_NAME_LEN]; | |
1333 | int i; | |
755d4fe4 | 1334 | int cnt; |
5ee9c198 MG |
1335 | unsigned int part, size; |
1336 | unsigned long time; | |
1337 | ||
1338 | while (&efivars->walk_entry->list != &efivars->list) { | |
1339 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1340 | vendor)) { | |
1341 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1342 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1343 | } | |
755d4fe4 SA |
1344 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1345 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1346 | *id = part; |
755d4fe4 | 1347 | *count = cnt; |
5ee9c198 MG |
1348 | timespec->tv_sec = time; |
1349 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1350 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1351 | type, &part, &time) == 3) { | |
1352 | /* | |
1353 | * Check if an old format, | |
1354 | * which doesn't support holding | |
1355 | * multiple logs, remains. | |
1356 | */ | |
1357 | *id = part; | |
1358 | *count = 0; | |
1359 | timespec->tv_sec = time; | |
1360 | timespec->tv_nsec = 0; | |
1361 | } else { | |
1362 | efivars->walk_entry = list_entry( | |
1363 | efivars->walk_entry->list.next, | |
1364 | struct efivar_entry, list); | |
1365 | continue; | |
5ee9c198 | 1366 | } |
0f7de85a SA |
1367 | |
1368 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1369 | size = efivars->walk_entry->var.DataSize; | |
1370 | *buf = kmalloc(size, GFP_KERNEL); | |
1371 | if (*buf == NULL) | |
1372 | return -ENOMEM; | |
1373 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1374 | size); | |
1375 | efivars->walk_entry = list_entry( | |
1376 | efivars->walk_entry->list.next, | |
1377 | struct efivar_entry, list); | |
1378 | return size; | |
5ee9c198 MG |
1379 | } |
1380 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1381 | struct efivar_entry, list); | |
1382 | } | |
1383 | return 0; | |
1384 | } | |
1385 | ||
3d6d8d20 KC |
1386 | static int efi_pstore_write(enum pstore_type_id type, |
1387 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1388 | unsigned int part, int count, size_t size, |
1389 | struct pstore_info *psi) | |
5ee9c198 MG |
1390 | { |
1391 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1392 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1393 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1394 | struct efivars *efivars = psi->data; | |
b238b8fa | 1395 | int i, ret = 0; |
d80a361d | 1396 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1397 | unsigned long flags; |
5ee9c198 | 1398 | |
e59310ad SA |
1399 | if (pstore_cannot_block_path(reason)) { |
1400 | /* | |
1401 | * If the lock is taken by another cpu in non-blocking path, | |
1402 | * this driver returns without entering firmware to avoid | |
1403 | * hanging up. | |
1404 | */ | |
81fa4e58 | 1405 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1406 | return -EBUSY; |
1407 | } else | |
81fa4e58 | 1408 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1409 | |
d80a361d SA |
1410 | /* |
1411 | * Check if there is a space enough to log. | |
1412 | * size: a size of logging data | |
1413 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1414 | */ | |
68d92986 MG |
1415 | |
1416 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1417 | size + DUMP_NAME_LEN * 2); | |
1418 | ||
1419 | if (status) { | |
81fa4e58 | 1420 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1421 | *id = part; |
1422 | return -ENOSPC; | |
1423 | } | |
1424 | ||
755d4fe4 | 1425 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1426 | get_seconds()); |
5ee9c198 MG |
1427 | |
1428 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1429 | efi_name[i] = name[i]; | |
1430 | ||
7644c16c | 1431 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1432 | size, psi->buf); |
1433 | ||
81fa4e58 | 1434 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1435 | |
e971318b | 1436 | if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled) |
a93bc0c6 | 1437 | schedule_work(&efivar_work); |
5ee9c198 | 1438 | |
b238b8fa CG |
1439 | *id = part; |
1440 | return ret; | |
5ee9c198 MG |
1441 | }; |
1442 | ||
755d4fe4 | 1443 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1444 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1445 | { |
a9efd39c | 1446 | char name[DUMP_NAME_LEN]; |
dd230fec | 1447 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1448 | char name_old[DUMP_NAME_LEN]; |
1449 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1450 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1451 | struct efivars *efivars = psi->data; | |
1452 | struct efivar_entry *entry, *found = NULL; | |
1453 | int i; | |
1454 | ||
755d4fe4 | 1455 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1456 | time.tv_sec); |
dd230fec | 1457 | |
81fa4e58 | 1458 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1459 | |
1460 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1461 | efi_name[i] = name[i]; |
dd230fec SA |
1462 | |
1463 | /* | |
a9efd39c | 1464 | * Clean up an entry with the same name |
dd230fec SA |
1465 | */ |
1466 | ||
1467 | list_for_each_entry(entry, &efivars->list, list) { | |
1468 | get_var_data_locked(efivars, &entry->var); | |
1469 | ||
1470 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1471 | continue; | |
1472 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1473 | utf16_strlen(efi_name))) { |
1474 | /* | |
1475 | * Check if an old format, | |
1476 | * which doesn't support holding | |
1477 | * multiple logs, remains. | |
1478 | */ | |
1479 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1480 | (unsigned int)id, time.tv_sec); | |
1481 | ||
1482 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1483 | efi_name_old[i] = name_old[i]; | |
1484 | ||
1485 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1486 | utf16_strlen(efi_name_old))) | |
1487 | continue; | |
1488 | } | |
dd230fec SA |
1489 | |
1490 | /* found */ | |
1491 | found = entry; | |
1492 | efivars->ops->set_variable(entry->var.VariableName, | |
1493 | &entry->var.VendorGuid, | |
1494 | PSTORE_EFI_ATTRIBUTES, | |
1495 | 0, NULL); | |
a9efd39c | 1496 | break; |
dd230fec SA |
1497 | } |
1498 | ||
1499 | if (found) | |
1500 | list_del(&found->list); | |
1501 | ||
81fa4e58 | 1502 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1503 | |
1504 | if (found) | |
1505 | efivar_unregister(found); | |
5ee9c198 MG |
1506 | |
1507 | return 0; | |
1508 | } | |
5ee9c198 MG |
1509 | |
1510 | static struct pstore_info efi_pstore_info = { | |
1511 | .owner = THIS_MODULE, | |
1512 | .name = "efi", | |
1513 | .open = efi_pstore_open, | |
1514 | .close = efi_pstore_close, | |
1515 | .read = efi_pstore_read, | |
1516 | .write = efi_pstore_write, | |
1517 | .erase = efi_pstore_erase, | |
1518 | }; | |
1da177e4 | 1519 | |
ed9dc8ce SF |
1520 | static void efivar_pstore_register(struct efivars *efivars) |
1521 | { | |
1522 | efivars->efi_pstore_info = efi_pstore_info; | |
1523 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1524 | if (efivars->efi_pstore_info.buf) { | |
1525 | efivars->efi_pstore_info.bufsize = 1024; | |
1526 | efivars->efi_pstore_info.data = efivars; | |
1527 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); | |
1528 | pstore_register(&efivars->efi_pstore_info); | |
1529 | } | |
1530 | } | |
1531 | #else | |
1532 | static void efivar_pstore_register(struct efivars *efivars) | |
1533 | { | |
1534 | return; | |
1535 | } | |
1536 | #endif | |
1537 | ||
2c3c8bea | 1538 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1539 | struct bin_attribute *bin_attr, |
1540 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1541 | { |
1542 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1543 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1544 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1545 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1546 | efi_status_t status = EFI_NOT_FOUND; |
1547 | int found = 0; | |
1548 | ||
1549 | if (!capable(CAP_SYS_ADMIN)) | |
1550 | return -EACCES; | |
1551 | ||
fec6c20b MG |
1552 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1553 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1554 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1555 | return -EINVAL; | |
1556 | } | |
1557 | ||
81fa4e58 | 1558 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1559 | |
1560 | /* | |
1561 | * Does this variable already exist? | |
1562 | */ | |
29422693 | 1563 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1564 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1565 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1566 | if (strsize1 == strsize2 && |
1567 | !memcmp(&(search_efivar->var.VariableName), | |
1568 | new_var->VariableName, strsize1) && | |
1569 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1570 | new_var->VendorGuid)) { | |
1571 | found = 1; | |
1572 | break; | |
1573 | } | |
1574 | } | |
1575 | if (found) { | |
81fa4e58 | 1576 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1577 | return -EINVAL; |
1578 | } | |
1579 | ||
68d92986 MG |
1580 | status = check_var_size_locked(efivars, new_var->Attributes, |
1581 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1582 | ||
1583 | if (status && status != EFI_UNSUPPORTED) { | |
1584 | spin_unlock_irq(&efivars->lock); | |
1585 | return efi_status_to_err(status); | |
1586 | } | |
1587 | ||
1da177e4 | 1588 | /* now *really* create the variable via EFI */ |
3295814d MW |
1589 | status = efivars->ops->set_variable(new_var->VariableName, |
1590 | &new_var->VendorGuid, | |
1591 | new_var->Attributes, | |
1592 | new_var->DataSize, | |
1593 | new_var->Data); | |
1da177e4 LT |
1594 | |
1595 | if (status != EFI_SUCCESS) { | |
1596 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1597 | status); | |
81fa4e58 | 1598 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1599 | return -EIO; |
1600 | } | |
81fa4e58 | 1601 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1602 | |
1603 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1604 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1605 | utf16_strsize(new_var->VariableName, |
1606 | 1024), | |
4142ef14 MW |
1607 | new_var->VariableName, |
1608 | &new_var->VendorGuid); | |
1da177e4 LT |
1609 | if (status) { |
1610 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1611 | } | |
1612 | return count; | |
1613 | } | |
1614 | ||
2c3c8bea | 1615 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1616 | struct bin_attribute *bin_attr, |
1617 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1618 | { |
1619 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1620 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1621 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1622 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1623 | efi_status_t status = EFI_NOT_FOUND; |
1624 | int found = 0; | |
1625 | ||
1626 | if (!capable(CAP_SYS_ADMIN)) | |
1627 | return -EACCES; | |
1628 | ||
81fa4e58 | 1629 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1630 | |
1631 | /* | |
1632 | * Does this variable already exist? | |
1633 | */ | |
29422693 | 1634 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1635 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1636 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1637 | if (strsize1 == strsize2 && |
1638 | !memcmp(&(search_efivar->var.VariableName), | |
1639 | del_var->VariableName, strsize1) && | |
1640 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1641 | del_var->VendorGuid)) { | |
1642 | found = 1; | |
1643 | break; | |
1644 | } | |
1645 | } | |
1646 | if (!found) { | |
81fa4e58 | 1647 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1648 | return -EINVAL; |
1649 | } | |
1650 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1651 | del_var->Attributes = 0; | |
1652 | del_var->DataSize = 0; | |
1653 | ||
3295814d MW |
1654 | status = efivars->ops->set_variable(del_var->VariableName, |
1655 | &del_var->VendorGuid, | |
1656 | del_var->Attributes, | |
1657 | del_var->DataSize, | |
1658 | del_var->Data); | |
1da177e4 LT |
1659 | |
1660 | if (status != EFI_SUCCESS) { | |
1661 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1662 | status); | |
81fa4e58 | 1663 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1664 | return -EIO; |
1665 | } | |
496a0fc8 | 1666 | list_del(&search_efivar->list); |
1da177e4 | 1667 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1668 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1669 | efivar_unregister(search_efivar); |
1670 | ||
1671 | /* It's dead Jim.... */ | |
1672 | return count; | |
1673 | } | |
1674 | ||
a93bc0c6 SA |
1675 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1676 | { | |
1677 | struct efivar_entry *entry, *n; | |
1678 | struct efivars *efivars = &__efivars; | |
1679 | unsigned long strsize1, strsize2; | |
1680 | bool found = false; | |
1681 | ||
1682 | strsize1 = utf16_strsize(variable_name, 1024); | |
1683 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1684 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1685 | if (strsize1 == strsize2 && | |
1686 | !memcmp(variable_name, &(entry->var.VariableName), | |
1687 | strsize2) && | |
1688 | !efi_guidcmp(entry->var.VendorGuid, | |
1689 | *vendor)) { | |
1690 | found = true; | |
1691 | break; | |
1692 | } | |
1693 | } | |
1694 | return found; | |
1695 | } | |
1696 | ||
ec50bd32 MF |
1697 | /* |
1698 | * Returns the size of variable_name, in bytes, including the | |
1699 | * terminating NULL character, or variable_name_size if no NULL | |
1700 | * character is found among the first variable_name_size bytes. | |
1701 | */ | |
1702 | static unsigned long var_name_strnsize(efi_char16_t *variable_name, | |
1703 | unsigned long variable_name_size) | |
1704 | { | |
1705 | unsigned long len; | |
1706 | efi_char16_t c; | |
1707 | ||
1708 | /* | |
1709 | * The variable name is, by definition, a NULL-terminated | |
1710 | * string, so make absolutely sure that variable_name_size is | |
1711 | * the value we expect it to be. If not, return the real size. | |
1712 | */ | |
1713 | for (len = 2; len <= variable_name_size; len += sizeof(c)) { | |
1714 | c = variable_name[(len / sizeof(c)) - 1]; | |
1715 | if (!c) | |
1716 | break; | |
1717 | } | |
1718 | ||
1719 | return min(len, variable_name_size); | |
1720 | } | |
1721 | ||
a93bc0c6 SA |
1722 | static void efivar_update_sysfs_entries(struct work_struct *work) |
1723 | { | |
1724 | struct efivars *efivars = &__efivars; | |
1725 | efi_guid_t vendor; | |
1726 | efi_char16_t *variable_name; | |
1727 | unsigned long variable_name_size = 1024; | |
1728 | efi_status_t status = EFI_NOT_FOUND; | |
1729 | bool found; | |
1730 | ||
1731 | /* Add new sysfs entries */ | |
1732 | while (1) { | |
1733 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1734 | if (!variable_name) { | |
1735 | pr_err("efivars: Memory allocation failed.\n"); | |
1736 | return; | |
1737 | } | |
1738 | ||
1739 | spin_lock_irq(&efivars->lock); | |
1740 | found = false; | |
1741 | while (1) { | |
1742 | variable_name_size = 1024; | |
1743 | status = efivars->ops->get_next_variable( | |
1744 | &variable_name_size, | |
1745 | variable_name, | |
1746 | &vendor); | |
1747 | if (status != EFI_SUCCESS) { | |
1748 | break; | |
1749 | } else { | |
1750 | if (!variable_is_present(variable_name, | |
1751 | &vendor)) { | |
1752 | found = true; | |
1753 | break; | |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | spin_unlock_irq(&efivars->lock); | |
1758 | ||
1759 | if (!found) { | |
1760 | kfree(variable_name); | |
1761 | break; | |
ec50bd32 MF |
1762 | } else { |
1763 | variable_name_size = var_name_strnsize(variable_name, | |
1764 | variable_name_size); | |
a93bc0c6 SA |
1765 | efivar_create_sysfs_entry(efivars, |
1766 | variable_name_size, | |
1767 | variable_name, &vendor); | |
ec50bd32 | 1768 | } |
a93bc0c6 SA |
1769 | } |
1770 | } | |
1771 | ||
1da177e4 LT |
1772 | /* |
1773 | * Let's not leave out systab information that snuck into | |
1774 | * the efivars driver | |
1775 | */ | |
334c6307 GKH |
1776 | static ssize_t systab_show(struct kobject *kobj, |
1777 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1778 | { |
1779 | char *str = buf; | |
1780 | ||
334c6307 | 1781 | if (!kobj || !buf) |
1da177e4 LT |
1782 | return -EINVAL; |
1783 | ||
b2c99e3c BH |
1784 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1785 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1786 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1787 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1788 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1789 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1790 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1791 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1792 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1793 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1794 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1795 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1796 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1797 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1798 | |
1799 | return str - buf; | |
1800 | } | |
1801 | ||
334c6307 GKH |
1802 | static struct kobj_attribute efi_attr_systab = |
1803 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1804 | |
334c6307 GKH |
1805 | static struct attribute *efi_subsys_attrs[] = { |
1806 | &efi_attr_systab.attr, | |
1da177e4 LT |
1807 | NULL, /* maybe more in the future? */ |
1808 | }; | |
1809 | ||
334c6307 GKH |
1810 | static struct attribute_group efi_subsys_attr_group = { |
1811 | .attrs = efi_subsys_attrs, | |
1812 | }; | |
1813 | ||
bc87d2fe | 1814 | static struct kobject *efi_kobj; |
1da177e4 LT |
1815 | |
1816 | /* | |
1817 | * efivar_create_sysfs_entry() | |
1818 | * Requires: | |
1819 | * variable_name_size = number of bytes required to hold | |
1820 | * variable_name (not counting the NULL | |
1821 | * character at the end. | |
29422693 | 1822 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1823 | * Returns 1 on failure, 0 on success |
1824 | */ | |
1825 | static int | |
4142ef14 MW |
1826 | efivar_create_sysfs_entry(struct efivars *efivars, |
1827 | unsigned long variable_name_size, | |
1828 | efi_char16_t *variable_name, | |
1829 | efi_guid_t *vendor_guid) | |
1da177e4 | 1830 | { |
310ad754 | 1831 | int i, short_name_size; |
1da177e4 LT |
1832 | char *short_name; |
1833 | struct efivar_entry *new_efivar; | |
1834 | ||
310ad754 JK |
1835 | /* |
1836 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1837 | * plus the GUID, plus trailing NUL | |
1838 | */ | |
1839 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1840 | + 1 + GUID_LEN + 1; | |
1841 | ||
1842 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1843 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1844 | |
1845 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1846 | kfree(short_name); |
1847 | kfree(new_efivar); | |
1da177e4 LT |
1848 | return 1; |
1849 | } | |
1da177e4 | 1850 | |
4142ef14 | 1851 | new_efivar->efivars = efivars; |
1da177e4 LT |
1852 | memcpy(new_efivar->var.VariableName, variable_name, |
1853 | variable_name_size); | |
1854 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1855 | ||
1856 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1857 | ala UTF-8 */ | |
1858 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1859 | short_name[i] = variable_name[i] & 0xFF; | |
1860 | } | |
1861 | /* This is ugly, but necessary to separate one vendor's | |
1862 | private variables from another's. */ | |
1863 | ||
1864 | *(short_name + strlen(short_name)) = '-'; | |
1865 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1866 | ||
29422693 | 1867 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1868 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1869 | "%s", short_name); | |
69b2186c JG |
1870 | if (i) { |
1871 | kfree(short_name); | |
1872 | kfree(new_efivar); | |
1873 | return 1; | |
1874 | } | |
1da177e4 | 1875 | |
d6d292c4 | 1876 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1877 | kfree(short_name); |
1878 | short_name = NULL; | |
1da177e4 | 1879 | |
81fa4e58 | 1880 | spin_lock_irq(&efivars->lock); |
29422693 | 1881 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1882 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1883 | |
1884 | return 0; | |
1885 | } | |
d502fbb0 MW |
1886 | |
1887 | static int | |
1888 | create_efivars_bin_attributes(struct efivars *efivars) | |
1889 | { | |
1890 | struct bin_attribute *attr; | |
1891 | int error; | |
1892 | ||
1893 | /* new_var */ | |
1894 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1895 | if (!attr) | |
1896 | return -ENOMEM; | |
1897 | ||
1898 | attr->attr.name = "new_var"; | |
1899 | attr->attr.mode = 0200; | |
1900 | attr->write = efivar_create; | |
1901 | attr->private = efivars; | |
1902 | efivars->new_var = attr; | |
1903 | ||
1904 | /* del_var */ | |
1905 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1906 | if (!attr) { | |
1907 | error = -ENOMEM; | |
1908 | goto out_free; | |
1909 | } | |
1910 | attr->attr.name = "del_var"; | |
1911 | attr->attr.mode = 0200; | |
1912 | attr->write = efivar_delete; | |
1913 | attr->private = efivars; | |
1914 | efivars->del_var = attr; | |
1915 | ||
1916 | sysfs_bin_attr_init(efivars->new_var); | |
1917 | sysfs_bin_attr_init(efivars->del_var); | |
1918 | ||
1919 | /* Register */ | |
1920 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1921 | efivars->new_var); | |
1922 | if (error) { | |
1923 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1924 | " due to error %d\n", error); | |
1925 | goto out_free; | |
1926 | } | |
1927 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1928 | efivars->del_var); | |
1929 | if (error) { | |
1930 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1931 | " due to error %d\n", error); | |
1932 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1933 | efivars->new_var); | |
1934 | goto out_free; | |
1935 | } | |
1936 | ||
1937 | return 0; | |
1938 | out_free: | |
051d51bc DC |
1939 | kfree(efivars->del_var); |
1940 | efivars->del_var = NULL; | |
d502fbb0 MW |
1941 | kfree(efivars->new_var); |
1942 | efivars->new_var = NULL; | |
1943 | return error; | |
1944 | } | |
1945 | ||
4fc756bd | 1946 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1947 | { |
1948 | struct efivar_entry *entry, *n; | |
4142ef14 | 1949 | |
76b53f7c | 1950 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1951 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1952 | list_del(&entry->list); |
81fa4e58 | 1953 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1954 | efivar_unregister(entry); |
1955 | } | |
1956 | if (efivars->new_var) | |
1957 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1958 | if (efivars->del_var) | |
1959 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1960 | kfree(efivars->new_var); | |
1961 | kfree(efivars->del_var); | |
605e70c7 | 1962 | kobject_put(efivars->kobject); |
76b53f7c MW |
1963 | kset_unregister(efivars->kset); |
1964 | } | |
4fc756bd | 1965 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1966 | |
e971318b MF |
1967 | /* |
1968 | * Print a warning when duplicate EFI variables are encountered and | |
1969 | * disable the sysfs workqueue since the firmware is buggy. | |
1970 | */ | |
1971 | static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid, | |
1972 | unsigned long len16) | |
1973 | { | |
1974 | size_t i, len8 = len16 / sizeof(efi_char16_t); | |
1975 | char *s8; | |
1976 | ||
1977 | /* | |
1978 | * Disable the workqueue since the algorithm it uses for | |
1979 | * detecting new variables won't work with this buggy | |
1980 | * implementation of GetNextVariableName(). | |
1981 | */ | |
1982 | efivar_wq_enabled = false; | |
1983 | ||
1984 | s8 = kzalloc(len8, GFP_KERNEL); | |
1985 | if (!s8) | |
1986 | return; | |
1987 | ||
1988 | for (i = 0; i < len8; i++) | |
1989 | s8[i] = s16[i]; | |
1990 | ||
1991 | printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n", | |
1992 | s8, vendor_guid); | |
1993 | kfree(s8); | |
1994 | } | |
1995 | ||
4fc756bd MW |
1996 | int register_efivars(struct efivars *efivars, |
1997 | const struct efivar_operations *ops, | |
1998 | struct kobject *parent_kobj) | |
1da177e4 LT |
1999 | { |
2000 | efi_status_t status = EFI_NOT_FOUND; | |
2001 | efi_guid_t vendor_guid; | |
2002 | efi_char16_t *variable_name; | |
1da177e4 | 2003 | unsigned long variable_name_size = 1024; |
334c6307 | 2004 | int error = 0; |
1da177e4 | 2005 | |
9c215384 | 2006 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
2007 | if (!variable_name) { |
2008 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
2009 | return -ENOMEM; | |
2010 | } | |
2011 | ||
29422693 MW |
2012 | spin_lock_init(&efivars->lock); |
2013 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 2014 | efivars->ops = ops; |
29422693 | 2015 | |
76b53f7c | 2016 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 2017 | if (!efivars->kset) { |
66ac831e GKH |
2018 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
2019 | error = -ENOMEM; | |
76b53f7c | 2020 | goto out; |
1da177e4 LT |
2021 | } |
2022 | ||
605e70c7 LCY |
2023 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
2024 | if (!efivars->kobject) { | |
2025 | pr_err("efivars: Subsystem registration failed.\n"); | |
2026 | error = -ENOMEM; | |
2027 | kset_unregister(efivars->kset); | |
2028 | goto out; | |
2029 | } | |
2030 | ||
1da177e4 LT |
2031 | /* |
2032 | * Per EFI spec, the maximum storage allocated for both | |
2033 | * the variable name and variable data is 1024 bytes. | |
2034 | */ | |
2035 | ||
2036 | do { | |
2037 | variable_name_size = 1024; | |
2038 | ||
3295814d | 2039 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2040 | variable_name, |
2041 | &vendor_guid); | |
2042 | switch (status) { | |
2043 | case EFI_SUCCESS: | |
ec50bd32 MF |
2044 | variable_name_size = var_name_strnsize(variable_name, |
2045 | variable_name_size); | |
e971318b MF |
2046 | |
2047 | /* | |
2048 | * Some firmware implementations return the | |
2049 | * same variable name on multiple calls to | |
2050 | * get_next_variable(). Terminate the loop | |
2051 | * immediately as there is no guarantee that | |
2052 | * we'll ever see a different variable name, | |
2053 | * and may end up looping here forever. | |
2054 | */ | |
2055 | if (variable_is_present(variable_name, &vendor_guid)) { | |
2056 | dup_variable_bug(variable_name, &vendor_guid, | |
2057 | variable_name_size); | |
2058 | status = EFI_NOT_FOUND; | |
2059 | break; | |
2060 | } | |
2061 | ||
4142ef14 MW |
2062 | efivar_create_sysfs_entry(efivars, |
2063 | variable_name_size, | |
2064 | variable_name, | |
2065 | &vendor_guid); | |
1da177e4 LT |
2066 | break; |
2067 | case EFI_NOT_FOUND: | |
2068 | break; | |
2069 | default: | |
2070 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2071 | status); | |
2072 | status = EFI_NOT_FOUND; | |
2073 | break; | |
2074 | } | |
2075 | } while (status != EFI_NOT_FOUND); | |
2076 | ||
d502fbb0 | 2077 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2078 | if (error) |
76b53f7c | 2079 | unregister_efivars(efivars); |
1da177e4 | 2080 | |
ec0971ba SF |
2081 | if (!efivars_pstore_disable) |
2082 | efivar_pstore_register(efivars); | |
5ee9c198 | 2083 | |
5d9db883 MG |
2084 | register_filesystem(&efivarfs_type); |
2085 | ||
76b53f7c MW |
2086 | out: |
2087 | kfree(variable_name); | |
1da177e4 | 2088 | |
76b53f7c MW |
2089 | return error; |
2090 | } | |
4fc756bd | 2091 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 2092 | |
76b53f7c MW |
2093 | /* |
2094 | * For now we register the efi subsystem with the firmware subsystem | |
2095 | * and the vars subsystem with the efi subsystem. In the future, it | |
2096 | * might make sense to split off the efi subsystem into its own | |
2097 | * driver, but for now only efivars will register with it, so just | |
2098 | * include it here. | |
2099 | */ | |
2100 | ||
2101 | static int __init | |
2102 | efivars_init(void) | |
2103 | { | |
2104 | int error = 0; | |
2105 | ||
2106 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
2107 | EFIVARS_DATE); | |
2108 | ||
83e68189 | 2109 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 2110 | return 0; |
76b53f7c MW |
2111 | |
2112 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
2113 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
2114 | if (!efi_kobj) { | |
2115 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
2116 | return -ENOMEM; | |
2117 | } | |
2118 | ||
3295814d MW |
2119 | ops.get_variable = efi.get_variable; |
2120 | ops.set_variable = efi.set_variable; | |
2121 | ops.get_next_variable = efi.get_next_variable; | |
a6e4d5a0 | 2122 | ops.query_variable_store = efi_query_variable_store; |
89d16665 | 2123 | |
3295814d | 2124 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
2125 | if (error) |
2126 | goto err_put; | |
76b53f7c MW |
2127 | |
2128 | /* Don't forget the systab entry */ | |
2129 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2130 | if (error) { | |
2131 | printk(KERN_ERR | |
2132 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2133 | error); | |
3116aabc | 2134 | goto err_unregister; |
76b53f7c | 2135 | } |
1da177e4 | 2136 | |
3116aabc DC |
2137 | return 0; |
2138 | ||
2139 | err_unregister: | |
2140 | unregister_efivars(&__efivars); | |
2141 | err_put: | |
2142 | kobject_put(efi_kobj); | |
1da177e4 LT |
2143 | return error; |
2144 | } | |
2145 | ||
2146 | static void __exit | |
2147 | efivars_exit(void) | |
2148 | { | |
a93bc0c6 SA |
2149 | cancel_work_sync(&efivar_work); |
2150 | ||
83e68189 | 2151 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
2152 | unregister_efivars(&__efivars); |
2153 | kobject_put(efi_kobj); | |
2154 | } | |
1da177e4 LT |
2155 | } |
2156 | ||
2157 | module_init(efivars_init); | |
2158 | module_exit(efivars_exit); | |
2159 |