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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 LT |
127 | struct efivar_entry { |
128 | struct efi_variable var; | |
129 | struct list_head list; | |
130 | struct kobject kobj; | |
131 | }; | |
132 | ||
1da177e4 LT |
133 | struct efivar_attribute { |
134 | struct attribute attr; | |
135 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
136 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
137 | }; | |
138 | ||
4423d779 MF |
139 | /* Private pointer to registered efivars */ |
140 | static struct efivars *__efivars; | |
5d9db883 | 141 | |
7644c16c MW |
142 | #define PSTORE_EFI_ATTRIBUTES \ |
143 | (EFI_VARIABLE_NON_VOLATILE | \ | |
144 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
145 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 146 | |
1da177e4 LT |
147 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
148 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 149 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
150 | .show = _show, \ |
151 | .store = _store, \ | |
152 | }; | |
153 | ||
1da177e4 LT |
154 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
155 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
156 | ||
157 | /* | |
158 | * Prototype for sysfs creation function | |
159 | */ | |
160 | static int | |
4142ef14 MW |
161 | efivar_create_sysfs_entry(struct efivars *efivars, |
162 | unsigned long variable_name_size, | |
163 | efi_char16_t *variable_name, | |
164 | efi_guid_t *vendor_guid); | |
1da177e4 | 165 | |
a93bc0c6 SA |
166 | /* |
167 | * Prototype for workqueue functions updating sysfs entry | |
168 | */ | |
169 | ||
170 | static void efivar_update_sysfs_entries(struct work_struct *); | |
171 | static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries); | |
e971318b | 172 | static bool efivar_wq_enabled = true; |
a93bc0c6 | 173 | |
1da177e4 LT |
174 | /* |
175 | * Return the number of bytes is the length of this string | |
176 | * Note: this is NOT the same as the number of unicode characters | |
177 | */ | |
178 | static inline unsigned long | |
a2940908 | 179 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 180 | { |
a2940908 | 181 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
182 | } |
183 | ||
828aa1f0 MW |
184 | static inline int |
185 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
186 | { | |
187 | while (1) { | |
188 | if (len == 0) | |
189 | return 0; | |
190 | if (*a < *b) | |
191 | return -1; | |
192 | if (*a > *b) | |
193 | return 1; | |
194 | if (*a == 0) /* implies *b == 0 */ | |
195 | return 0; | |
196 | a++; | |
197 | b++; | |
198 | len--; | |
199 | } | |
200 | } | |
201 | ||
fec6c20b | 202 | static bool |
54b3a4d3 MG |
203 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
204 | unsigned long len) | |
fec6c20b MG |
205 | { |
206 | struct efi_generic_dev_path *node; | |
207 | int offset = 0; | |
208 | ||
209 | node = (struct efi_generic_dev_path *)buffer; | |
210 | ||
54b3a4d3 MG |
211 | if (len < sizeof(*node)) |
212 | return false; | |
fec6c20b | 213 | |
54b3a4d3 MG |
214 | while (offset <= len - sizeof(*node) && |
215 | node->length >= sizeof(*node) && | |
216 | node->length <= len - offset) { | |
217 | offset += node->length; | |
fec6c20b MG |
218 | |
219 | if ((node->type == EFI_DEV_END_PATH || | |
220 | node->type == EFI_DEV_END_PATH2) && | |
221 | node->sub_type == EFI_DEV_END_ENTIRE) | |
222 | return true; | |
223 | ||
224 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
225 | } | |
226 | ||
227 | /* | |
228 | * If we're here then either node->length pointed past the end | |
229 | * of the buffer or we reached the end of the buffer without | |
230 | * finding a device path end node. | |
231 | */ | |
232 | return false; | |
233 | } | |
234 | ||
235 | static bool | |
54b3a4d3 MG |
236 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
237 | unsigned long len) | |
fec6c20b MG |
238 | { |
239 | /* An array of 16-bit integers */ | |
240 | if ((len % 2) != 0) | |
241 | return false; | |
242 | ||
243 | return true; | |
244 | } | |
245 | ||
246 | static bool | |
54b3a4d3 MG |
247 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
248 | unsigned long len) | |
fec6c20b MG |
249 | { |
250 | u16 filepathlength; | |
54b3a4d3 MG |
251 | int i, desclength = 0, namelen; |
252 | ||
253 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
254 | |
255 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
256 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
257 | if (var->VariableName[i] > 127 || |
258 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
259 | return true; |
260 | } | |
261 | ||
54b3a4d3 MG |
262 | /* Reject it if there's 4 digits of hex and then further content */ |
263 | if (namelen > match + 4) | |
264 | return false; | |
265 | ||
266 | /* A valid entry must be at least 8 bytes */ | |
267 | if (len < 8) | |
fec6c20b MG |
268 | return false; |
269 | ||
270 | filepathlength = buffer[4] | buffer[5] << 8; | |
271 | ||
272 | /* | |
273 | * There's no stored length for the description, so it has to be | |
274 | * found by hand | |
275 | */ | |
54b3a4d3 | 276 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
277 | |
278 | /* Each boot entry must have a descriptor */ | |
279 | if (!desclength) | |
280 | return false; | |
281 | ||
282 | /* | |
283 | * If the sum of the length of the description, the claimed filepath | |
284 | * length and the original header are greater than the length of the | |
285 | * variable, it's malformed | |
286 | */ | |
287 | if ((desclength + filepathlength + 6) > len) | |
288 | return false; | |
289 | ||
290 | /* | |
291 | * And, finally, check the filepath | |
292 | */ | |
293 | return validate_device_path(var, match, buffer + desclength + 6, | |
294 | filepathlength); | |
295 | } | |
296 | ||
297 | static bool | |
54b3a4d3 MG |
298 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
299 | unsigned long len) | |
fec6c20b MG |
300 | { |
301 | /* A single 16-bit integer */ | |
302 | if (len != 2) | |
303 | return false; | |
304 | ||
305 | return true; | |
306 | } | |
307 | ||
308 | static bool | |
54b3a4d3 MG |
309 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
310 | unsigned long len) | |
fec6c20b MG |
311 | { |
312 | int i; | |
313 | ||
314 | for (i = 0; i < len; i++) { | |
315 | if (buffer[i] > 127) | |
316 | return false; | |
317 | ||
318 | if (buffer[i] == 0) | |
319 | return true; | |
320 | } | |
321 | ||
322 | return false; | |
323 | } | |
324 | ||
325 | struct variable_validate { | |
326 | char *name; | |
327 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 328 | unsigned long len); |
fec6c20b MG |
329 | }; |
330 | ||
331 | static const struct variable_validate variable_validate[] = { | |
332 | { "BootNext", validate_uint16 }, | |
333 | { "BootOrder", validate_boot_order }, | |
334 | { "DriverOrder", validate_boot_order }, | |
335 | { "Boot*", validate_load_option }, | |
336 | { "Driver*", validate_load_option }, | |
337 | { "ConIn", validate_device_path }, | |
338 | { "ConInDev", validate_device_path }, | |
339 | { "ConOut", validate_device_path }, | |
340 | { "ConOutDev", validate_device_path }, | |
341 | { "ErrOut", validate_device_path }, | |
342 | { "ErrOutDev", validate_device_path }, | |
343 | { "Timeout", validate_uint16 }, | |
344 | { "Lang", validate_ascii_string }, | |
345 | { "PlatformLang", validate_ascii_string }, | |
346 | { "", NULL }, | |
347 | }; | |
348 | ||
349 | static bool | |
54b3a4d3 | 350 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
351 | { |
352 | int i; | |
353 | u16 *unicode_name = var->VariableName; | |
354 | ||
355 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
356 | const char *name = variable_validate[i].name; | |
357 | int match; | |
358 | ||
359 | for (match = 0; ; match++) { | |
360 | char c = name[match]; | |
361 | u16 u = unicode_name[match]; | |
362 | ||
363 | /* All special variables are plain ascii */ | |
364 | if (u > 127) | |
365 | return true; | |
366 | ||
367 | /* Wildcard in the matching name means we've matched */ | |
368 | if (c == '*') | |
369 | return variable_validate[i].validate(var, | |
370 | match, data, len); | |
371 | ||
372 | /* Case sensitive match */ | |
373 | if (c != u) | |
374 | break; | |
375 | ||
376 | /* Reached the end of the string while matching */ | |
377 | if (!c) | |
378 | return variable_validate[i].validate(var, | |
379 | match, data, len); | |
380 | } | |
381 | } | |
382 | ||
383 | return true; | |
384 | } | |
385 | ||
1da177e4 | 386 | static efi_status_t |
5ee9c198 | 387 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
388 | { |
389 | efi_status_t status; | |
390 | ||
1da177e4 | 391 | var->DataSize = 1024; |
3295814d MW |
392 | status = efivars->ops->get_variable(var->VariableName, |
393 | &var->VendorGuid, | |
394 | &var->Attributes, | |
395 | &var->DataSize, | |
396 | var->Data); | |
5ee9c198 MG |
397 | return status; |
398 | } | |
399 | ||
400 | static efi_status_t | |
401 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
402 | { | |
403 | efi_status_t status; | |
81fa4e58 | 404 | unsigned long flags; |
5ee9c198 | 405 | |
81fa4e58 | 406 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 407 | status = get_var_data_locked(efivars, var); |
81fa4e58 | 408 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 409 | |
1da177e4 LT |
410 | if (status != EFI_SUCCESS) { |
411 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
412 | status); | |
413 | } | |
414 | return status; | |
415 | } | |
416 | ||
68d92986 MG |
417 | static efi_status_t |
418 | check_var_size_locked(struct efivars *efivars, u32 attributes, | |
419 | unsigned long size) | |
420 | { | |
421 | u64 storage_size, remaining_size, max_size; | |
422 | efi_status_t status; | |
423 | const struct efivar_operations *fops = efivars->ops; | |
424 | ||
425 | if (!efivars->ops->query_variable_info) | |
426 | return EFI_UNSUPPORTED; | |
427 | ||
428 | status = fops->query_variable_info(attributes, &storage_size, | |
429 | &remaining_size, &max_size); | |
430 | ||
431 | if (status != EFI_SUCCESS) | |
432 | return status; | |
433 | ||
434 | if (!storage_size || size > remaining_size || size > max_size || | |
435 | (remaining_size - size) < (storage_size / 2)) | |
436 | return EFI_OUT_OF_RESOURCES; | |
437 | ||
438 | return status; | |
439 | } | |
440 | ||
441 | ||
442 | static efi_status_t | |
443 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
444 | { | |
445 | efi_status_t status; | |
446 | unsigned long flags; | |
447 | ||
448 | spin_lock_irqsave(&efivars->lock, flags); | |
449 | status = check_var_size_locked(efivars, attributes, size); | |
450 | spin_unlock_irqrestore(&efivars->lock, flags); | |
451 | ||
452 | return status; | |
453 | } | |
454 | ||
1da177e4 LT |
455 | static ssize_t |
456 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
457 | { | |
458 | struct efi_variable *var = &entry->var; | |
459 | char *str = buf; | |
460 | ||
461 | if (!entry || !buf) | |
462 | return 0; | |
463 | ||
464 | efi_guid_unparse(&var->VendorGuid, str); | |
465 | str += strlen(str); | |
466 | str += sprintf(str, "\n"); | |
467 | ||
468 | return str - buf; | |
469 | } | |
470 | ||
471 | static ssize_t | |
472 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
473 | { | |
474 | struct efi_variable *var = &entry->var; | |
475 | char *str = buf; | |
476 | efi_status_t status; | |
477 | ||
478 | if (!entry || !buf) | |
479 | return -EINVAL; | |
480 | ||
4423d779 | 481 | status = get_var_data(__efivars, var); |
1da177e4 LT |
482 | if (status != EFI_SUCCESS) |
483 | return -EIO; | |
484 | ||
70839090 | 485 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 486 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 487 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 488 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 489 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 490 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
491 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
492 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
493 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
494 | str += sprintf(str, | |
495 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
496 | if (var->Attributes & | |
497 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
498 | str += sprintf(str, | |
499 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
500 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
501 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
502 | return str - buf; |
503 | } | |
504 | ||
505 | static ssize_t | |
506 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
507 | { | |
508 | struct efi_variable *var = &entry->var; | |
509 | char *str = buf; | |
510 | efi_status_t status; | |
511 | ||
512 | if (!entry || !buf) | |
513 | return -EINVAL; | |
514 | ||
4423d779 | 515 | status = get_var_data(__efivars, var); |
1da177e4 LT |
516 | if (status != EFI_SUCCESS) |
517 | return -EIO; | |
518 | ||
519 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
520 | return str - buf; | |
521 | } | |
522 | ||
523 | static ssize_t | |
524 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
525 | { | |
526 | struct efi_variable *var = &entry->var; | |
527 | efi_status_t status; | |
528 | ||
529 | if (!entry || !buf) | |
530 | return -EINVAL; | |
531 | ||
4423d779 | 532 | status = get_var_data(__efivars, var); |
1da177e4 LT |
533 | if (status != EFI_SUCCESS) |
534 | return -EIO; | |
535 | ||
536 | memcpy(buf, var->Data, var->DataSize); | |
537 | return var->DataSize; | |
538 | } | |
539 | /* | |
540 | * We allow each variable to be edited via rewriting the | |
541 | * entire efi variable structure. | |
542 | */ | |
543 | static ssize_t | |
544 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
545 | { | |
546 | struct efi_variable *new_var, *var = &entry->var; | |
4423d779 | 547 | struct efivars *efivars = __efivars; |
1da177e4 LT |
548 | efi_status_t status = EFI_NOT_FOUND; |
549 | ||
550 | if (count != sizeof(struct efi_variable)) | |
551 | return -EINVAL; | |
552 | ||
553 | new_var = (struct efi_variable *)buf; | |
554 | /* | |
555 | * If only updating the variable data, then the name | |
556 | * and guid should remain the same | |
557 | */ | |
558 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
559 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
560 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
565 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
fec6c20b MG |
569 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
570 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
571 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
81fa4e58 | 575 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
576 | |
577 | status = check_var_size_locked(efivars, new_var->Attributes, | |
578 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
579 | ||
580 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
581 | status = efivars->ops->set_variable(new_var->VariableName, | |
582 | &new_var->VendorGuid, | |
583 | new_var->Attributes, | |
584 | new_var->DataSize, | |
585 | new_var->Data); | |
1da177e4 | 586 | |
81fa4e58 | 587 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
588 | |
589 | if (status != EFI_SUCCESS) { | |
590 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
591 | status); | |
592 | return -EIO; | |
593 | } | |
594 | ||
595 | memcpy(&entry->var, new_var, count); | |
596 | return count; | |
597 | } | |
598 | ||
599 | static ssize_t | |
600 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
601 | { | |
602 | struct efi_variable *var = &entry->var; | |
603 | efi_status_t status; | |
604 | ||
605 | if (!entry || !buf) | |
606 | return 0; | |
607 | ||
4423d779 | 608 | status = get_var_data(__efivars, var); |
1da177e4 LT |
609 | if (status != EFI_SUCCESS) |
610 | return -EIO; | |
611 | ||
612 | memcpy(buf, var, sizeof(*var)); | |
613 | return sizeof(*var); | |
614 | } | |
615 | ||
616 | /* | |
617 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 618 | * the attributes... |
1da177e4 LT |
619 | */ |
620 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
621 | char *buf) | |
622 | { | |
623 | struct efivar_entry *var = to_efivar_entry(kobj); | |
624 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 625 | ssize_t ret = -EIO; |
1da177e4 LT |
626 | |
627 | if (!capable(CAP_SYS_ADMIN)) | |
628 | return -EACCES; | |
629 | ||
630 | if (efivar_attr->show) { | |
631 | ret = efivar_attr->show(var, buf); | |
632 | } | |
633 | return ret; | |
634 | } | |
635 | ||
636 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
637 | const char *buf, size_t count) | |
638 | { | |
639 | struct efivar_entry *var = to_efivar_entry(kobj); | |
640 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 641 | ssize_t ret = -EIO; |
1da177e4 LT |
642 | |
643 | if (!capable(CAP_SYS_ADMIN)) | |
644 | return -EACCES; | |
645 | ||
646 | if (efivar_attr->store) | |
647 | ret = efivar_attr->store(var, buf, count); | |
648 | ||
649 | return ret; | |
650 | } | |
651 | ||
52cf25d0 | 652 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
653 | .show = efivar_attr_show, |
654 | .store = efivar_attr_store, | |
655 | }; | |
656 | ||
657 | static void efivar_release(struct kobject *kobj) | |
658 | { | |
659 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
660 | kfree(var); |
661 | } | |
662 | ||
663 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
664 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
665 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
666 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
667 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
668 | ||
669 | static struct attribute *def_attrs[] = { | |
670 | &efivar_attr_guid.attr, | |
671 | &efivar_attr_size.attr, | |
672 | &efivar_attr_attributes.attr, | |
673 | &efivar_attr_data.attr, | |
674 | &efivar_attr_raw_var.attr, | |
675 | NULL, | |
676 | }; | |
677 | ||
e89a4116 | 678 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
679 | .release = efivar_release, |
680 | .sysfs_ops = &efivar_attr_ops, | |
681 | .default_attrs = def_attrs, | |
682 | }; | |
683 | ||
1da177e4 LT |
684 | static inline void |
685 | efivar_unregister(struct efivar_entry *var) | |
686 | { | |
c10997f6 | 687 | kobject_put(&var->kobj); |
1da177e4 LT |
688 | } |
689 | ||
5d9db883 MG |
690 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
691 | { | |
692 | file->private_data = inode->i_private; | |
693 | return 0; | |
694 | } | |
695 | ||
7253eaba MF |
696 | static int efi_status_to_err(efi_status_t status) |
697 | { | |
698 | int err; | |
699 | ||
700 | switch (status) { | |
701 | case EFI_INVALID_PARAMETER: | |
702 | err = -EINVAL; | |
703 | break; | |
704 | case EFI_OUT_OF_RESOURCES: | |
705 | err = -ENOSPC; | |
706 | break; | |
707 | case EFI_DEVICE_ERROR: | |
708 | err = -EIO; | |
709 | break; | |
710 | case EFI_WRITE_PROTECTED: | |
711 | err = -EROFS; | |
712 | break; | |
713 | case EFI_SECURITY_VIOLATION: | |
714 | err = -EACCES; | |
715 | break; | |
716 | case EFI_NOT_FOUND: | |
1fa7e695 | 717 | err = -EIO; |
7253eaba MF |
718 | break; |
719 | default: | |
720 | err = -EINVAL; | |
721 | } | |
722 | ||
723 | return err; | |
724 | } | |
725 | ||
5d9db883 MG |
726 | static ssize_t efivarfs_file_write(struct file *file, |
727 | const char __user *userbuf, size_t count, loff_t *ppos) | |
728 | { | |
729 | struct efivar_entry *var = file->private_data; | |
4423d779 | 730 | struct efivars *efivars = __efivars; |
5d9db883 MG |
731 | efi_status_t status; |
732 | void *data; | |
733 | u32 attributes; | |
734 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 735 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 736 | unsigned long newdatasize, varsize; |
cfcf2f11 | 737 | ssize_t bytes = 0; |
5d9db883 MG |
738 | |
739 | if (count < sizeof(attributes)) | |
740 | return -EINVAL; | |
741 | ||
89d16665 MF |
742 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
743 | return -EFAULT; | |
5d9db883 | 744 | |
89d16665 MF |
745 | if (attributes & ~(EFI_VARIABLE_MASK)) |
746 | return -EINVAL; | |
5d9db883 | 747 | |
89d16665 MF |
748 | /* |
749 | * Ensure that the user can't allocate arbitrarily large | |
750 | * amounts of memory. Pick a default size of 64K if | |
751 | * QueryVariableInfo() isn't supported by the firmware. | |
752 | */ | |
89d16665 | 753 | |
68d92986 MG |
754 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
755 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
756 | |
757 | if (status != EFI_SUCCESS) { | |
758 | if (status != EFI_UNSUPPORTED) | |
759 | return efi_status_to_err(status); | |
760 | ||
68d92986 MG |
761 | if (datasize > 65536) |
762 | return -ENOSPC; | |
5d9db883 MG |
763 | } |
764 | ||
89d16665 MF |
765 | data = kmalloc(datasize, GFP_KERNEL); |
766 | if (!data) | |
767 | return -ENOMEM; | |
768 | ||
5d9db883 | 769 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 770 | bytes = -EFAULT; |
5d9db883 MG |
771 | goto out; |
772 | } | |
773 | ||
774 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 775 | bytes = -EINVAL; |
5d9db883 MG |
776 | goto out; |
777 | } | |
778 | ||
f5f6a60a JK |
779 | /* |
780 | * The lock here protects the get_variable call, the conditional | |
781 | * set_variable call, and removal of the variable from the efivars | |
782 | * list (in the case of an authenticated delete). | |
783 | */ | |
81fa4e58 | 784 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 785 | |
68d92986 MG |
786 | /* |
787 | * Ensure that the available space hasn't shrunk below the safe level | |
788 | */ | |
789 | ||
790 | status = check_var_size_locked(efivars, attributes, varsize); | |
791 | ||
792 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
793 | spin_unlock_irq(&efivars->lock); | |
794 | kfree(data); | |
795 | ||
796 | return efi_status_to_err(status); | |
797 | } | |
798 | ||
5d9db883 MG |
799 | status = efivars->ops->set_variable(var->var.VariableName, |
800 | &var->var.VendorGuid, | |
801 | attributes, datasize, | |
802 | data); | |
803 | ||
f5f6a60a | 804 | if (status != EFI_SUCCESS) { |
81fa4e58 | 805 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
806 | kfree(data); |
807 | ||
7253eaba | 808 | return efi_status_to_err(status); |
5d9db883 | 809 | } |
0c542edd | 810 | |
cfcf2f11 MF |
811 | bytes = count; |
812 | ||
0c542edd JK |
813 | /* |
814 | * Writing to the variable may have caused a change in size (which | |
815 | * could either be an append or an overwrite), or the variable to be | |
816 | * deleted. Perform a GetVariable() so we can tell what actually | |
817 | * happened. | |
818 | */ | |
819 | newdatasize = 0; | |
820 | status = efivars->ops->get_variable(var->var.VariableName, | |
821 | &var->var.VendorGuid, | |
822 | NULL, &newdatasize, | |
823 | NULL); | |
824 | ||
825 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 826 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
827 | mutex_lock(&inode->i_mutex); |
828 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
829 | mutex_unlock(&inode->i_mutex); | |
830 | ||
831 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 832 | list_del(&var->list); |
81fa4e58 | 833 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
834 | efivar_unregister(var); |
835 | drop_nlink(inode); | |
791eb564 | 836 | d_delete(file->f_dentry); |
0c542edd JK |
837 | dput(file->f_dentry); |
838 | ||
839 | } else { | |
81fa4e58 | 840 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
841 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
842 | "status = %lx\n", status); | |
843 | } | |
844 | ||
5d9db883 MG |
845 | out: |
846 | kfree(data); | |
847 | ||
cfcf2f11 | 848 | return bytes; |
5d9db883 MG |
849 | } |
850 | ||
851 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
852 | size_t count, loff_t *ppos) | |
853 | { | |
854 | struct efivar_entry *var = file->private_data; | |
4423d779 | 855 | struct efivars *efivars = __efivars; |
5d9db883 MG |
856 | efi_status_t status; |
857 | unsigned long datasize = 0; | |
858 | u32 attributes; | |
859 | void *data; | |
d142df03 | 860 | ssize_t size = 0; |
5d9db883 | 861 | |
81fa4e58 | 862 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
863 | status = efivars->ops->get_variable(var->var.VariableName, |
864 | &var->var.VendorGuid, | |
865 | &attributes, &datasize, NULL); | |
81fa4e58 | 866 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
867 | |
868 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 869 | return efi_status_to_err(status); |
5d9db883 | 870 | |
d2923841 | 871 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
872 | |
873 | if (!data) | |
7253eaba | 874 | return -ENOMEM; |
5d9db883 | 875 | |
81fa4e58 | 876 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
877 | status = efivars->ops->get_variable(var->var.VariableName, |
878 | &var->var.VendorGuid, | |
879 | &attributes, &datasize, | |
d2923841 | 880 | (data + sizeof(attributes))); |
81fa4e58 | 881 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 882 | |
7253eaba MF |
883 | if (status != EFI_SUCCESS) { |
884 | size = efi_status_to_err(status); | |
d142df03 | 885 | goto out_free; |
7253eaba | 886 | } |
5d9db883 | 887 | |
d2923841 | 888 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 889 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 890 | data, datasize + sizeof(attributes)); |
d142df03 | 891 | out_free: |
5d9db883 MG |
892 | kfree(data); |
893 | ||
894 | return size; | |
895 | } | |
896 | ||
897 | static void efivarfs_evict_inode(struct inode *inode) | |
898 | { | |
899 | clear_inode(inode); | |
900 | } | |
901 | ||
902 | static const struct super_operations efivarfs_ops = { | |
903 | .statfs = simple_statfs, | |
904 | .drop_inode = generic_delete_inode, | |
905 | .evict_inode = efivarfs_evict_inode, | |
906 | .show_options = generic_show_options, | |
907 | }; | |
908 | ||
909 | static struct super_block *efivarfs_sb; | |
910 | ||
911 | static const struct inode_operations efivarfs_dir_inode_operations; | |
912 | ||
913 | static const struct file_operations efivarfs_file_operations = { | |
914 | .open = efivarfs_file_open, | |
915 | .read = efivarfs_file_read, | |
916 | .write = efivarfs_file_write, | |
917 | .llseek = no_llseek, | |
918 | }; | |
919 | ||
920 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
921 | const struct inode *dir, int mode, dev_t dev) | |
922 | { | |
923 | struct inode *inode = new_inode(sb); | |
924 | ||
925 | if (inode) { | |
926 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
927 | inode->i_mode = mode; |
928 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
929 | switch (mode & S_IFMT) { | |
930 | case S_IFREG: | |
931 | inode->i_fop = &efivarfs_file_operations; | |
932 | break; | |
933 | case S_IFDIR: | |
934 | inode->i_op = &efivarfs_dir_inode_operations; | |
935 | inode->i_fop = &simple_dir_operations; | |
936 | inc_nlink(inode); | |
937 | break; | |
938 | } | |
939 | } | |
940 | return inode; | |
941 | } | |
942 | ||
47f531e8 MF |
943 | /* |
944 | * Return true if 'str' is a valid efivarfs filename of the form, | |
945 | * | |
946 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
947 | */ | |
948 | static bool efivarfs_valid_name(const char *str, int len) | |
949 | { | |
950 | static const char dashes[GUID_LEN] = { | |
951 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
952 | }; | |
953 | const char *s = str + len - GUID_LEN; | |
954 | int i; | |
955 | ||
956 | /* | |
957 | * We need a GUID, plus at least one letter for the variable name, | |
958 | * plus the '-' separator | |
959 | */ | |
960 | if (len < GUID_LEN + 2) | |
961 | return false; | |
962 | ||
123abd76 MF |
963 | /* GUID must be preceded by a '-' */ |
964 | if (*(s - 1) != '-') | |
47f531e8 MF |
965 | return false; |
966 | ||
967 | /* | |
968 | * Validate that 's' is of the correct format, e.g. | |
969 | * | |
970 | * 12345678-1234-1234-1234-123456789abc | |
971 | */ | |
972 | for (i = 0; i < GUID_LEN; i++) { | |
973 | if (dashes[i]) { | |
974 | if (*s++ != '-') | |
975 | return false; | |
976 | } else { | |
977 | if (!isxdigit(*s++)) | |
978 | return false; | |
979 | } | |
980 | } | |
981 | ||
982 | return true; | |
983 | } | |
984 | ||
5d9db883 MG |
985 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
986 | { | |
987 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
988 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
989 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
990 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
991 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
992 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
993 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
994 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
995 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
996 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
997 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
998 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
999 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1000 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1001 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1002 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1003 | } | |
1004 | ||
1005 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1006 | umode_t mode, bool excl) | |
1007 | { | |
45a937a8 | 1008 | struct inode *inode; |
4423d779 | 1009 | struct efivars *efivars = __efivars; |
5d9db883 MG |
1010 | struct efivar_entry *var; |
1011 | int namelen, i = 0, err = 0; | |
1012 | ||
47f531e8 | 1013 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1014 | return -EINVAL; |
1015 | ||
45a937a8 | 1016 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1017 | if (!inode) |
aeeaa8d4 | 1018 | return -ENOMEM; |
5d9db883 MG |
1019 | |
1020 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1021 | if (!var) { |
1022 | err = -ENOMEM; | |
1023 | goto out; | |
1024 | } | |
5d9db883 | 1025 | |
310ad754 JK |
1026 | /* length of the variable name itself: remove GUID and separator */ |
1027 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1028 | |
1029 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1030 | &var->var.VendorGuid); | |
1031 | ||
1032 | for (i = 0; i < namelen; i++) | |
1033 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1034 | ||
1035 | var->var.VariableName[i] = '\0'; | |
1036 | ||
1037 | inode->i_private = var; | |
5d9db883 MG |
1038 | var->kobj.kset = efivars->kset; |
1039 | ||
1040 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1041 | dentry->d_name.name); | |
1042 | if (err) | |
1043 | goto out; | |
1044 | ||
1045 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1046 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1047 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1048 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1049 | d_instantiate(dentry, inode); |
1050 | dget(dentry); | |
1051 | out: | |
45a937a8 | 1052 | if (err) { |
5d9db883 | 1053 | kfree(var); |
45a937a8 AW |
1054 | iput(inode); |
1055 | } | |
5d9db883 MG |
1056 | return err; |
1057 | } | |
1058 | ||
1059 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1060 | { | |
1061 | struct efivar_entry *var = dentry->d_inode->i_private; | |
4423d779 | 1062 | struct efivars *efivars = __efivars; |
5d9db883 MG |
1063 | efi_status_t status; |
1064 | ||
81fa4e58 | 1065 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1066 | |
1067 | status = efivars->ops->set_variable(var->var.VariableName, | |
1068 | &var->var.VendorGuid, | |
1069 | 0, 0, NULL); | |
1070 | ||
1071 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1072 | list_del(&var->list); | |
81fa4e58 | 1073 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1074 | efivar_unregister(var); |
de5fe955 | 1075 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1076 | dput(dentry); |
1077 | return 0; | |
1078 | } | |
1079 | ||
81fa4e58 | 1080 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1081 | return -EINVAL; |
1082 | }; | |
1083 | ||
da27a243 MF |
1084 | /* |
1085 | * Compare two efivarfs file names. | |
1086 | * | |
1087 | * An efivarfs filename is composed of two parts, | |
1088 | * | |
1089 | * 1. A case-sensitive variable name | |
1090 | * 2. A case-insensitive GUID | |
1091 | * | |
1092 | * So we need to perform a case-sensitive match on part 1 and a | |
1093 | * case-insensitive match on part 2. | |
1094 | */ | |
1095 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1096 | const struct dentry *dentry, const struct inode *inode, | |
1097 | unsigned int len, const char *str, | |
1098 | const struct qstr *name) | |
1099 | { | |
1100 | int guid = len - GUID_LEN; | |
1101 | ||
1102 | if (name->len != len) | |
1103 | return 1; | |
1104 | ||
1105 | /* Case-sensitive compare for the variable name */ | |
1106 | if (memcmp(str, name->name, guid)) | |
1107 | return 1; | |
1108 | ||
1109 | /* Case-insensitive compare for the GUID */ | |
1110 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1111 | } | |
1112 | ||
1113 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1114 | const struct inode *inode, struct qstr *qstr) | |
1115 | { | |
1116 | unsigned long hash = init_name_hash(); | |
1117 | const unsigned char *s = qstr->name; | |
1118 | unsigned int len = qstr->len; | |
1119 | ||
1120 | if (!efivarfs_valid_name(s, len)) | |
1121 | return -EINVAL; | |
1122 | ||
1123 | while (len-- > GUID_LEN) | |
1124 | hash = partial_name_hash(*s++, hash); | |
1125 | ||
1126 | /* GUID is case-insensitive. */ | |
1127 | while (len--) | |
1128 | hash = partial_name_hash(tolower(*s++), hash); | |
1129 | ||
1130 | qstr->hash = end_name_hash(hash); | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1136 | * memory and lookup time: arrange for them to be deleted immediately. | |
1137 | */ | |
1138 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1139 | { | |
1140 | return 1; | |
1141 | } | |
1142 | ||
1143 | static struct dentry_operations efivarfs_d_ops = { | |
1144 | .d_compare = efivarfs_d_compare, | |
1145 | .d_hash = efivarfs_d_hash, | |
1146 | .d_delete = efivarfs_delete_dentry, | |
1147 | }; | |
1148 | ||
1149 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1150 | { | |
feff5dc4 | 1151 | struct dentry *d; |
da27a243 | 1152 | struct qstr q; |
feff5dc4 | 1153 | int err; |
da27a243 MF |
1154 | |
1155 | q.name = name; | |
1156 | q.len = strlen(name); | |
1157 | ||
feff5dc4 MF |
1158 | err = efivarfs_d_hash(NULL, NULL, &q); |
1159 | if (err) | |
1160 | return ERR_PTR(err); | |
1161 | ||
1162 | d = d_alloc(parent, &q); | |
1163 | if (d) | |
1164 | return d; | |
da27a243 | 1165 | |
feff5dc4 | 1166 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1167 | } |
1168 | ||
e83af1f1 | 1169 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1170 | { |
1171 | struct inode *inode = NULL; | |
1172 | struct dentry *root; | |
1173 | struct efivar_entry *entry, *n; | |
4423d779 | 1174 | struct efivars *efivars = __efivars; |
5ba6e291 | 1175 | char *name; |
feff5dc4 | 1176 | int err = -ENOMEM; |
5d9db883 MG |
1177 | |
1178 | efivarfs_sb = sb; | |
1179 | ||
1180 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1181 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1182 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1183 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1184 | sb->s_op = &efivarfs_ops; |
da27a243 | 1185 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1186 | sb->s_time_gran = 1; |
1187 | ||
1188 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1189 | if (!inode) |
1190 | return -ENOMEM; | |
5d9db883 MG |
1191 | inode->i_op = &efivarfs_dir_inode_operations; |
1192 | ||
1193 | root = d_make_root(inode); | |
1194 | sb->s_root = root; | |
5c9b50ab AW |
1195 | if (!root) |
1196 | return -ENOMEM; | |
5d9db883 MG |
1197 | |
1198 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1199 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1200 | unsigned long size = 0; |
1201 | int len, i; | |
1202 | ||
5ba6e291 AW |
1203 | inode = NULL; |
1204 | ||
5d9db883 MG |
1205 | len = utf16_strlen(entry->var.VariableName); |
1206 | ||
310ad754 JK |
1207 | /* name, plus '-', plus GUID, plus NUL*/ |
1208 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1209 | if (!name) |
1210 | goto fail; | |
5d9db883 MG |
1211 | |
1212 | for (i = 0; i < len; i++) | |
1213 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1214 | ||
1215 | name[len] = '-'; | |
1216 | ||
1217 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1218 | ||
310ad754 | 1219 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1220 | |
1221 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1222 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1223 | if (!inode) |
1224 | goto fail_name; | |
1225 | ||
da27a243 | 1226 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1227 | if (IS_ERR(dentry)) { |
1228 | err = PTR_ERR(dentry); | |
5ba6e291 | 1229 | goto fail_inode; |
feff5dc4 | 1230 | } |
5ba6e291 | 1231 | |
c0359db1 AW |
1232 | /* copied by the above to local storage in the dentry. */ |
1233 | kfree(name); | |
5d9db883 | 1234 | |
81fa4e58 | 1235 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1236 | efivars->ops->get_variable(entry->var.VariableName, |
1237 | &entry->var.VendorGuid, | |
1238 | &entry->var.Attributes, | |
1239 | &size, | |
1240 | NULL); | |
81fa4e58 | 1241 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1242 | |
1243 | mutex_lock(&inode->i_mutex); | |
1244 | inode->i_private = entry; | |
94a193fb | 1245 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1246 | mutex_unlock(&inode->i_mutex); |
1247 | d_add(dentry, inode); | |
1248 | } | |
1249 | ||
1250 | return 0; | |
5ba6e291 AW |
1251 | |
1252 | fail_inode: | |
1253 | iput(inode); | |
1254 | fail_name: | |
1255 | kfree(name); | |
1256 | fail: | |
feff5dc4 | 1257 | return err; |
5d9db883 MG |
1258 | } |
1259 | ||
1260 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1261 | int flags, const char *dev_name, void *data) | |
1262 | { | |
1263 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1264 | } | |
1265 | ||
1266 | static void efivarfs_kill_sb(struct super_block *sb) | |
1267 | { | |
1268 | kill_litter_super(sb); | |
1269 | efivarfs_sb = NULL; | |
1270 | } | |
1271 | ||
1272 | static struct file_system_type efivarfs_type = { | |
1273 | .name = "efivarfs", | |
1274 | .mount = efivarfs_mount, | |
1275 | .kill_sb = efivarfs_kill_sb, | |
1276 | }; | |
7f78e035 | 1277 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1278 | |
da27a243 MF |
1279 | /* |
1280 | * Handle negative dentry. | |
1281 | */ | |
1282 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1283 | unsigned int flags) | |
1284 | { | |
1285 | if (dentry->d_name.len > NAME_MAX) | |
1286 | return ERR_PTR(-ENAMETOOLONG); | |
1287 | d_add(dentry, NULL); | |
1288 | return NULL; | |
1289 | } | |
1290 | ||
5d9db883 | 1291 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1292 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1293 | .unlink = efivarfs_unlink, |
1294 | .create = efivarfs_create, | |
1295 | }; | |
1296 | ||
ed9dc8ce | 1297 | #ifdef CONFIG_EFI_VARS_PSTORE |
5ee9c198 MG |
1298 | |
1299 | static int efi_pstore_open(struct pstore_info *psi) | |
1300 | { | |
4423d779 | 1301 | struct efivars *efivars = __efivars; |
5ee9c198 | 1302 | |
81fa4e58 | 1303 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1304 | efivars->walk_entry = list_first_entry(&efivars->list, |
1305 | struct efivar_entry, list); | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | static int efi_pstore_close(struct pstore_info *psi) | |
1310 | { | |
4423d779 | 1311 | struct efivars *efivars = __efivars; |
5ee9c198 | 1312 | |
81fa4e58 | 1313 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1314 | return 0; |
1315 | } | |
1316 | ||
1317 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1318 | int *count, struct timespec *timespec, |
f6f82851 | 1319 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1320 | { |
1321 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
4423d779 | 1322 | struct efivars *efivars = __efivars; |
5ee9c198 MG |
1323 | char name[DUMP_NAME_LEN]; |
1324 | int i; | |
755d4fe4 | 1325 | int cnt; |
5ee9c198 MG |
1326 | unsigned int part, size; |
1327 | unsigned long time; | |
1328 | ||
1329 | while (&efivars->walk_entry->list != &efivars->list) { | |
1330 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1331 | vendor)) { | |
1332 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1333 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1334 | } | |
755d4fe4 SA |
1335 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1336 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1337 | *id = part; |
755d4fe4 | 1338 | *count = cnt; |
5ee9c198 MG |
1339 | timespec->tv_sec = time; |
1340 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1341 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1342 | type, &part, &time) == 3) { | |
1343 | /* | |
1344 | * Check if an old format, | |
1345 | * which doesn't support holding | |
1346 | * multiple logs, remains. | |
1347 | */ | |
1348 | *id = part; | |
1349 | *count = 0; | |
1350 | timespec->tv_sec = time; | |
1351 | timespec->tv_nsec = 0; | |
1352 | } else { | |
1353 | efivars->walk_entry = list_entry( | |
1354 | efivars->walk_entry->list.next, | |
1355 | struct efivar_entry, list); | |
1356 | continue; | |
5ee9c198 | 1357 | } |
0f7de85a SA |
1358 | |
1359 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1360 | size = efivars->walk_entry->var.DataSize; | |
1361 | *buf = kmalloc(size, GFP_KERNEL); | |
1362 | if (*buf == NULL) | |
1363 | return -ENOMEM; | |
1364 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1365 | size); | |
1366 | efivars->walk_entry = list_entry( | |
1367 | efivars->walk_entry->list.next, | |
1368 | struct efivar_entry, list); | |
1369 | return size; | |
5ee9c198 MG |
1370 | } |
1371 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1372 | struct efivar_entry, list); | |
1373 | } | |
1374 | return 0; | |
1375 | } | |
1376 | ||
3d6d8d20 KC |
1377 | static int efi_pstore_write(enum pstore_type_id type, |
1378 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1379 | unsigned int part, int count, size_t size, |
1380 | struct pstore_info *psi) | |
5ee9c198 MG |
1381 | { |
1382 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1383 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1384 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
4423d779 | 1385 | struct efivars *efivars = __efivars; |
b238b8fa | 1386 | int i, ret = 0; |
d80a361d | 1387 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1388 | unsigned long flags; |
5ee9c198 | 1389 | |
e59310ad SA |
1390 | if (pstore_cannot_block_path(reason)) { |
1391 | /* | |
1392 | * If the lock is taken by another cpu in non-blocking path, | |
1393 | * this driver returns without entering firmware to avoid | |
1394 | * hanging up. | |
1395 | */ | |
81fa4e58 | 1396 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1397 | return -EBUSY; |
1398 | } else | |
81fa4e58 | 1399 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1400 | |
d80a361d SA |
1401 | /* |
1402 | * Check if there is a space enough to log. | |
1403 | * size: a size of logging data | |
1404 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1405 | */ | |
68d92986 MG |
1406 | |
1407 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1408 | size + DUMP_NAME_LEN * 2); | |
1409 | ||
1410 | if (status) { | |
81fa4e58 | 1411 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1412 | *id = part; |
1413 | return -ENOSPC; | |
1414 | } | |
1415 | ||
755d4fe4 | 1416 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1417 | get_seconds()); |
5ee9c198 MG |
1418 | |
1419 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1420 | efi_name[i] = name[i]; | |
1421 | ||
7644c16c | 1422 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1423 | size, psi->buf); |
1424 | ||
81fa4e58 | 1425 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1426 | |
e971318b | 1427 | if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled) |
a93bc0c6 | 1428 | schedule_work(&efivar_work); |
5ee9c198 | 1429 | |
b238b8fa CG |
1430 | *id = part; |
1431 | return ret; | |
5ee9c198 MG |
1432 | }; |
1433 | ||
755d4fe4 | 1434 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1435 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1436 | { |
a9efd39c | 1437 | char name[DUMP_NAME_LEN]; |
dd230fec | 1438 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1439 | char name_old[DUMP_NAME_LEN]; |
1440 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec | 1441 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
4423d779 | 1442 | struct efivars *efivars = __efivars; |
dd230fec SA |
1443 | struct efivar_entry *entry, *found = NULL; |
1444 | int i; | |
1445 | ||
755d4fe4 | 1446 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1447 | time.tv_sec); |
dd230fec | 1448 | |
81fa4e58 | 1449 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1450 | |
1451 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1452 | efi_name[i] = name[i]; |
dd230fec SA |
1453 | |
1454 | /* | |
a9efd39c | 1455 | * Clean up an entry with the same name |
dd230fec SA |
1456 | */ |
1457 | ||
1458 | list_for_each_entry(entry, &efivars->list, list) { | |
1459 | get_var_data_locked(efivars, &entry->var); | |
1460 | ||
1461 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1462 | continue; | |
1463 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1464 | utf16_strlen(efi_name))) { |
1465 | /* | |
1466 | * Check if an old format, | |
1467 | * which doesn't support holding | |
1468 | * multiple logs, remains. | |
1469 | */ | |
1470 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1471 | (unsigned int)id, time.tv_sec); | |
1472 | ||
1473 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1474 | efi_name_old[i] = name_old[i]; | |
1475 | ||
1476 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1477 | utf16_strlen(efi_name_old))) | |
1478 | continue; | |
1479 | } | |
dd230fec SA |
1480 | |
1481 | /* found */ | |
1482 | found = entry; | |
1483 | efivars->ops->set_variable(entry->var.VariableName, | |
1484 | &entry->var.VendorGuid, | |
1485 | PSTORE_EFI_ATTRIBUTES, | |
1486 | 0, NULL); | |
a9efd39c | 1487 | break; |
dd230fec SA |
1488 | } |
1489 | ||
1490 | if (found) | |
1491 | list_del(&found->list); | |
1492 | ||
81fa4e58 | 1493 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1494 | |
1495 | if (found) | |
1496 | efivar_unregister(found); | |
5ee9c198 MG |
1497 | |
1498 | return 0; | |
1499 | } | |
5ee9c198 MG |
1500 | |
1501 | static struct pstore_info efi_pstore_info = { | |
1502 | .owner = THIS_MODULE, | |
1503 | .name = "efi", | |
1504 | .open = efi_pstore_open, | |
1505 | .close = efi_pstore_close, | |
1506 | .read = efi_pstore_read, | |
1507 | .write = efi_pstore_write, | |
1508 | .erase = efi_pstore_erase, | |
1509 | }; | |
1da177e4 | 1510 | |
ed9dc8ce SF |
1511 | static void efivar_pstore_register(struct efivars *efivars) |
1512 | { | |
1513 | efivars->efi_pstore_info = efi_pstore_info; | |
1514 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1515 | if (efivars->efi_pstore_info.buf) { | |
1516 | efivars->efi_pstore_info.bufsize = 1024; | |
1517 | efivars->efi_pstore_info.data = efivars; | |
1518 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); | |
1519 | pstore_register(&efivars->efi_pstore_info); | |
1520 | } | |
1521 | } | |
1522 | #else | |
1523 | static void efivar_pstore_register(struct efivars *efivars) | |
1524 | { | |
1525 | return; | |
1526 | } | |
1527 | #endif | |
1528 | ||
2c3c8bea | 1529 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1530 | struct bin_attribute *bin_attr, |
1531 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1532 | { |
1533 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4423d779 | 1534 | struct efivars *efivars = __efivars; |
496a0fc8 | 1535 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1536 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1537 | efi_status_t status = EFI_NOT_FOUND; |
1538 | int found = 0; | |
1539 | ||
1540 | if (!capable(CAP_SYS_ADMIN)) | |
1541 | return -EACCES; | |
1542 | ||
fec6c20b MG |
1543 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1544 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1545 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1546 | return -EINVAL; | |
1547 | } | |
1548 | ||
81fa4e58 | 1549 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1550 | |
1551 | /* | |
1552 | * Does this variable already exist? | |
1553 | */ | |
29422693 | 1554 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1555 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1556 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1557 | if (strsize1 == strsize2 && |
1558 | !memcmp(&(search_efivar->var.VariableName), | |
1559 | new_var->VariableName, strsize1) && | |
1560 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1561 | new_var->VendorGuid)) { | |
1562 | found = 1; | |
1563 | break; | |
1564 | } | |
1565 | } | |
1566 | if (found) { | |
81fa4e58 | 1567 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1568 | return -EINVAL; |
1569 | } | |
1570 | ||
68d92986 MG |
1571 | status = check_var_size_locked(efivars, new_var->Attributes, |
1572 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1573 | ||
1574 | if (status && status != EFI_UNSUPPORTED) { | |
1575 | spin_unlock_irq(&efivars->lock); | |
1576 | return efi_status_to_err(status); | |
1577 | } | |
1578 | ||
1da177e4 | 1579 | /* now *really* create the variable via EFI */ |
3295814d MW |
1580 | status = efivars->ops->set_variable(new_var->VariableName, |
1581 | &new_var->VendorGuid, | |
1582 | new_var->Attributes, | |
1583 | new_var->DataSize, | |
1584 | new_var->Data); | |
1da177e4 LT |
1585 | |
1586 | if (status != EFI_SUCCESS) { | |
1587 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1588 | status); | |
81fa4e58 | 1589 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1590 | return -EIO; |
1591 | } | |
81fa4e58 | 1592 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1593 | |
1594 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1595 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1596 | utf16_strsize(new_var->VariableName, |
1597 | 1024), | |
4142ef14 MW |
1598 | new_var->VariableName, |
1599 | &new_var->VendorGuid); | |
1da177e4 LT |
1600 | if (status) { |
1601 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1602 | } | |
1603 | return count; | |
1604 | } | |
1605 | ||
2c3c8bea | 1606 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1607 | struct bin_attribute *bin_attr, |
1608 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1609 | { |
1610 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4423d779 | 1611 | struct efivars *efivars = __efivars; |
496a0fc8 | 1612 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1613 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1614 | efi_status_t status = EFI_NOT_FOUND; |
1615 | int found = 0; | |
1616 | ||
1617 | if (!capable(CAP_SYS_ADMIN)) | |
1618 | return -EACCES; | |
1619 | ||
81fa4e58 | 1620 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1621 | |
1622 | /* | |
1623 | * Does this variable already exist? | |
1624 | */ | |
29422693 | 1625 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1626 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1627 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1628 | if (strsize1 == strsize2 && |
1629 | !memcmp(&(search_efivar->var.VariableName), | |
1630 | del_var->VariableName, strsize1) && | |
1631 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1632 | del_var->VendorGuid)) { | |
1633 | found = 1; | |
1634 | break; | |
1635 | } | |
1636 | } | |
1637 | if (!found) { | |
81fa4e58 | 1638 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1639 | return -EINVAL; |
1640 | } | |
1641 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1642 | del_var->Attributes = 0; | |
1643 | del_var->DataSize = 0; | |
1644 | ||
3295814d MW |
1645 | status = efivars->ops->set_variable(del_var->VariableName, |
1646 | &del_var->VendorGuid, | |
1647 | del_var->Attributes, | |
1648 | del_var->DataSize, | |
1649 | del_var->Data); | |
1da177e4 LT |
1650 | |
1651 | if (status != EFI_SUCCESS) { | |
1652 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1653 | status); | |
81fa4e58 | 1654 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1655 | return -EIO; |
1656 | } | |
496a0fc8 | 1657 | list_del(&search_efivar->list); |
1da177e4 | 1658 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1659 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1660 | efivar_unregister(search_efivar); |
1661 | ||
1662 | /* It's dead Jim.... */ | |
1663 | return count; | |
1664 | } | |
1665 | ||
a93bc0c6 SA |
1666 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1667 | { | |
1668 | struct efivar_entry *entry, *n; | |
4423d779 | 1669 | struct efivars *efivars = __efivars; |
a93bc0c6 SA |
1670 | unsigned long strsize1, strsize2; |
1671 | bool found = false; | |
1672 | ||
1673 | strsize1 = utf16_strsize(variable_name, 1024); | |
1674 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1675 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1676 | if (strsize1 == strsize2 && | |
1677 | !memcmp(variable_name, &(entry->var.VariableName), | |
1678 | strsize2) && | |
1679 | !efi_guidcmp(entry->var.VendorGuid, | |
1680 | *vendor)) { | |
1681 | found = true; | |
1682 | break; | |
1683 | } | |
1684 | } | |
1685 | return found; | |
1686 | } | |
1687 | ||
ec50bd32 MF |
1688 | /* |
1689 | * Returns the size of variable_name, in bytes, including the | |
1690 | * terminating NULL character, or variable_name_size if no NULL | |
1691 | * character is found among the first variable_name_size bytes. | |
1692 | */ | |
1693 | static unsigned long var_name_strnsize(efi_char16_t *variable_name, | |
1694 | unsigned long variable_name_size) | |
1695 | { | |
1696 | unsigned long len; | |
1697 | efi_char16_t c; | |
1698 | ||
1699 | /* | |
1700 | * The variable name is, by definition, a NULL-terminated | |
1701 | * string, so make absolutely sure that variable_name_size is | |
1702 | * the value we expect it to be. If not, return the real size. | |
1703 | */ | |
1704 | for (len = 2; len <= variable_name_size; len += sizeof(c)) { | |
1705 | c = variable_name[(len / sizeof(c)) - 1]; | |
1706 | if (!c) | |
1707 | break; | |
1708 | } | |
1709 | ||
1710 | return min(len, variable_name_size); | |
1711 | } | |
1712 | ||
a93bc0c6 SA |
1713 | static void efivar_update_sysfs_entries(struct work_struct *work) |
1714 | { | |
4423d779 | 1715 | struct efivars *efivars = __efivars; |
a93bc0c6 SA |
1716 | efi_guid_t vendor; |
1717 | efi_char16_t *variable_name; | |
1718 | unsigned long variable_name_size = 1024; | |
1719 | efi_status_t status = EFI_NOT_FOUND; | |
1720 | bool found; | |
1721 | ||
1722 | /* Add new sysfs entries */ | |
1723 | while (1) { | |
1724 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1725 | if (!variable_name) { | |
1726 | pr_err("efivars: Memory allocation failed.\n"); | |
1727 | return; | |
1728 | } | |
1729 | ||
1730 | spin_lock_irq(&efivars->lock); | |
1731 | found = false; | |
1732 | while (1) { | |
1733 | variable_name_size = 1024; | |
1734 | status = efivars->ops->get_next_variable( | |
1735 | &variable_name_size, | |
1736 | variable_name, | |
1737 | &vendor); | |
1738 | if (status != EFI_SUCCESS) { | |
1739 | break; | |
1740 | } else { | |
1741 | if (!variable_is_present(variable_name, | |
1742 | &vendor)) { | |
1743 | found = true; | |
1744 | break; | |
1745 | } | |
1746 | } | |
1747 | } | |
1748 | spin_unlock_irq(&efivars->lock); | |
1749 | ||
1750 | if (!found) { | |
1751 | kfree(variable_name); | |
1752 | break; | |
ec50bd32 MF |
1753 | } else { |
1754 | variable_name_size = var_name_strnsize(variable_name, | |
1755 | variable_name_size); | |
a93bc0c6 SA |
1756 | efivar_create_sysfs_entry(efivars, |
1757 | variable_name_size, | |
1758 | variable_name, &vendor); | |
ec50bd32 | 1759 | } |
a93bc0c6 SA |
1760 | } |
1761 | } | |
1762 | ||
1da177e4 LT |
1763 | /* |
1764 | * Let's not leave out systab information that snuck into | |
1765 | * the efivars driver | |
1766 | */ | |
334c6307 GKH |
1767 | static ssize_t systab_show(struct kobject *kobj, |
1768 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1769 | { |
1770 | char *str = buf; | |
1771 | ||
334c6307 | 1772 | if (!kobj || !buf) |
1da177e4 LT |
1773 | return -EINVAL; |
1774 | ||
b2c99e3c BH |
1775 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1776 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1777 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1778 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1779 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1780 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1781 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1782 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1783 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1784 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1785 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1786 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1787 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1788 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1789 | |
1790 | return str - buf; | |
1791 | } | |
1792 | ||
334c6307 GKH |
1793 | static struct kobj_attribute efi_attr_systab = |
1794 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1795 | |
334c6307 GKH |
1796 | static struct attribute *efi_subsys_attrs[] = { |
1797 | &efi_attr_systab.attr, | |
1da177e4 LT |
1798 | NULL, /* maybe more in the future? */ |
1799 | }; | |
1800 | ||
334c6307 GKH |
1801 | static struct attribute_group efi_subsys_attr_group = { |
1802 | .attrs = efi_subsys_attrs, | |
1803 | }; | |
1804 | ||
bc87d2fe | 1805 | static struct kobject *efi_kobj; |
1da177e4 LT |
1806 | |
1807 | /* | |
1808 | * efivar_create_sysfs_entry() | |
1809 | * Requires: | |
1810 | * variable_name_size = number of bytes required to hold | |
1811 | * variable_name (not counting the NULL | |
1812 | * character at the end. | |
29422693 | 1813 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1814 | * Returns 1 on failure, 0 on success |
1815 | */ | |
1816 | static int | |
4142ef14 MW |
1817 | efivar_create_sysfs_entry(struct efivars *efivars, |
1818 | unsigned long variable_name_size, | |
1819 | efi_char16_t *variable_name, | |
1820 | efi_guid_t *vendor_guid) | |
1da177e4 | 1821 | { |
310ad754 | 1822 | int i, short_name_size; |
1da177e4 LT |
1823 | char *short_name; |
1824 | struct efivar_entry *new_efivar; | |
1825 | ||
310ad754 JK |
1826 | /* |
1827 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1828 | * plus the GUID, plus trailing NUL | |
1829 | */ | |
1830 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1831 | + 1 + GUID_LEN + 1; | |
1832 | ||
1833 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1834 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1835 | |
1836 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1837 | kfree(short_name); |
1838 | kfree(new_efivar); | |
1da177e4 LT |
1839 | return 1; |
1840 | } | |
1da177e4 LT |
1841 | |
1842 | memcpy(new_efivar->var.VariableName, variable_name, | |
1843 | variable_name_size); | |
1844 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1845 | ||
1846 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1847 | ala UTF-8 */ | |
1848 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1849 | short_name[i] = variable_name[i] & 0xFF; | |
1850 | } | |
1851 | /* This is ugly, but necessary to separate one vendor's | |
1852 | private variables from another's. */ | |
1853 | ||
1854 | *(short_name + strlen(short_name)) = '-'; | |
1855 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1856 | ||
29422693 | 1857 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1858 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1859 | "%s", short_name); | |
69b2186c JG |
1860 | if (i) { |
1861 | kfree(short_name); | |
1862 | kfree(new_efivar); | |
1863 | return 1; | |
1864 | } | |
1da177e4 | 1865 | |
d6d292c4 | 1866 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1867 | kfree(short_name); |
1868 | short_name = NULL; | |
1da177e4 | 1869 | |
81fa4e58 | 1870 | spin_lock_irq(&efivars->lock); |
29422693 | 1871 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1872 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1873 | |
1874 | return 0; | |
1875 | } | |
d502fbb0 MW |
1876 | |
1877 | static int | |
1878 | create_efivars_bin_attributes(struct efivars *efivars) | |
1879 | { | |
1880 | struct bin_attribute *attr; | |
1881 | int error; | |
1882 | ||
1883 | /* new_var */ | |
1884 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1885 | if (!attr) | |
1886 | return -ENOMEM; | |
1887 | ||
1888 | attr->attr.name = "new_var"; | |
1889 | attr->attr.mode = 0200; | |
1890 | attr->write = efivar_create; | |
1891 | attr->private = efivars; | |
1892 | efivars->new_var = attr; | |
1893 | ||
1894 | /* del_var */ | |
1895 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1896 | if (!attr) { | |
1897 | error = -ENOMEM; | |
1898 | goto out_free; | |
1899 | } | |
1900 | attr->attr.name = "del_var"; | |
1901 | attr->attr.mode = 0200; | |
1902 | attr->write = efivar_delete; | |
1903 | attr->private = efivars; | |
1904 | efivars->del_var = attr; | |
1905 | ||
1906 | sysfs_bin_attr_init(efivars->new_var); | |
1907 | sysfs_bin_attr_init(efivars->del_var); | |
1908 | ||
1909 | /* Register */ | |
1910 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1911 | efivars->new_var); | |
1912 | if (error) { | |
1913 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1914 | " due to error %d\n", error); | |
1915 | goto out_free; | |
1916 | } | |
1917 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1918 | efivars->del_var); | |
1919 | if (error) { | |
1920 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1921 | " due to error %d\n", error); | |
1922 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1923 | efivars->new_var); | |
1924 | goto out_free; | |
1925 | } | |
1926 | ||
1927 | return 0; | |
1928 | out_free: | |
051d51bc DC |
1929 | kfree(efivars->del_var); |
1930 | efivars->del_var = NULL; | |
d502fbb0 MW |
1931 | kfree(efivars->new_var); |
1932 | efivars->new_var = NULL; | |
1933 | return error; | |
1934 | } | |
1935 | ||
4fc756bd | 1936 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1937 | { |
1938 | struct efivar_entry *entry, *n; | |
4142ef14 | 1939 | |
4423d779 MF |
1940 | __efivars = NULL; |
1941 | ||
76b53f7c | 1942 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1943 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1944 | list_del(&entry->list); |
81fa4e58 | 1945 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1946 | efivar_unregister(entry); |
1947 | } | |
1948 | if (efivars->new_var) | |
1949 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1950 | if (efivars->del_var) | |
1951 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1952 | kfree(efivars->new_var); | |
1953 | kfree(efivars->del_var); | |
605e70c7 | 1954 | kobject_put(efivars->kobject); |
76b53f7c MW |
1955 | kset_unregister(efivars->kset); |
1956 | } | |
4fc756bd | 1957 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1958 | |
e971318b MF |
1959 | /* |
1960 | * Print a warning when duplicate EFI variables are encountered and | |
1961 | * disable the sysfs workqueue since the firmware is buggy. | |
1962 | */ | |
1963 | static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid, | |
1964 | unsigned long len16) | |
1965 | { | |
1966 | size_t i, len8 = len16 / sizeof(efi_char16_t); | |
1967 | char *s8; | |
1968 | ||
1969 | /* | |
1970 | * Disable the workqueue since the algorithm it uses for | |
1971 | * detecting new variables won't work with this buggy | |
1972 | * implementation of GetNextVariableName(). | |
1973 | */ | |
1974 | efivar_wq_enabled = false; | |
1975 | ||
1976 | s8 = kzalloc(len8, GFP_KERNEL); | |
1977 | if (!s8) | |
1978 | return; | |
1979 | ||
1980 | for (i = 0; i < len8; i++) | |
1981 | s8[i] = s16[i]; | |
1982 | ||
1983 | printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n", | |
1984 | s8, vendor_guid); | |
1985 | kfree(s8); | |
1986 | } | |
1987 | ||
4fc756bd MW |
1988 | int register_efivars(struct efivars *efivars, |
1989 | const struct efivar_operations *ops, | |
1990 | struct kobject *parent_kobj) | |
1da177e4 LT |
1991 | { |
1992 | efi_status_t status = EFI_NOT_FOUND; | |
1993 | efi_guid_t vendor_guid; | |
1994 | efi_char16_t *variable_name; | |
1da177e4 | 1995 | unsigned long variable_name_size = 1024; |
334c6307 | 1996 | int error = 0; |
1da177e4 | 1997 | |
4423d779 MF |
1998 | __efivars = efivars; |
1999 | ||
9c215384 | 2000 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
2001 | if (!variable_name) { |
2002 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
2003 | return -ENOMEM; | |
2004 | } | |
2005 | ||
29422693 MW |
2006 | spin_lock_init(&efivars->lock); |
2007 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 2008 | efivars->ops = ops; |
29422693 | 2009 | |
76b53f7c | 2010 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 2011 | if (!efivars->kset) { |
66ac831e GKH |
2012 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
2013 | error = -ENOMEM; | |
76b53f7c | 2014 | goto out; |
1da177e4 LT |
2015 | } |
2016 | ||
605e70c7 LCY |
2017 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
2018 | if (!efivars->kobject) { | |
2019 | pr_err("efivars: Subsystem registration failed.\n"); | |
2020 | error = -ENOMEM; | |
2021 | kset_unregister(efivars->kset); | |
2022 | goto out; | |
2023 | } | |
2024 | ||
1da177e4 LT |
2025 | /* |
2026 | * Per EFI spec, the maximum storage allocated for both | |
2027 | * the variable name and variable data is 1024 bytes. | |
2028 | */ | |
2029 | ||
2030 | do { | |
2031 | variable_name_size = 1024; | |
2032 | ||
3295814d | 2033 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2034 | variable_name, |
2035 | &vendor_guid); | |
2036 | switch (status) { | |
2037 | case EFI_SUCCESS: | |
ec50bd32 MF |
2038 | variable_name_size = var_name_strnsize(variable_name, |
2039 | variable_name_size); | |
e971318b MF |
2040 | |
2041 | /* | |
2042 | * Some firmware implementations return the | |
2043 | * same variable name on multiple calls to | |
2044 | * get_next_variable(). Terminate the loop | |
2045 | * immediately as there is no guarantee that | |
2046 | * we'll ever see a different variable name, | |
2047 | * and may end up looping here forever. | |
2048 | */ | |
2049 | if (variable_is_present(variable_name, &vendor_guid)) { | |
2050 | dup_variable_bug(variable_name, &vendor_guid, | |
2051 | variable_name_size); | |
2052 | status = EFI_NOT_FOUND; | |
2053 | break; | |
2054 | } | |
2055 | ||
4142ef14 MW |
2056 | efivar_create_sysfs_entry(efivars, |
2057 | variable_name_size, | |
2058 | variable_name, | |
2059 | &vendor_guid); | |
1da177e4 LT |
2060 | break; |
2061 | case EFI_NOT_FOUND: | |
2062 | break; | |
2063 | default: | |
2064 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2065 | status); | |
2066 | status = EFI_NOT_FOUND; | |
2067 | break; | |
2068 | } | |
2069 | } while (status != EFI_NOT_FOUND); | |
2070 | ||
d502fbb0 | 2071 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2072 | if (error) |
76b53f7c | 2073 | unregister_efivars(efivars); |
1da177e4 | 2074 | |
ec0971ba SF |
2075 | if (!efivars_pstore_disable) |
2076 | efivar_pstore_register(efivars); | |
5ee9c198 | 2077 | |
5d9db883 MG |
2078 | register_filesystem(&efivarfs_type); |
2079 | ||
76b53f7c MW |
2080 | out: |
2081 | kfree(variable_name); | |
1da177e4 | 2082 | |
76b53f7c MW |
2083 | return error; |
2084 | } | |
4fc756bd | 2085 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 2086 | |
4423d779 MF |
2087 | static struct efivars generic_efivars; |
2088 | static struct efivar_operations generic_ops; | |
2089 | ||
2090 | static int generic_ops_register(void) | |
2091 | { | |
2092 | generic_ops.get_variable = efi.get_variable; | |
2093 | generic_ops.set_variable = efi.set_variable; | |
2094 | generic_ops.get_next_variable = efi.get_next_variable; | |
2095 | generic_ops.query_variable_info = efi.query_variable_info; | |
2096 | ||
2097 | return register_efivars(&generic_efivars, &generic_ops, efi_kobj); | |
2098 | } | |
2099 | ||
2100 | static void generic_ops_unregister(void) | |
2101 | { | |
2102 | unregister_efivars(&generic_efivars); | |
2103 | } | |
2104 | ||
76b53f7c MW |
2105 | /* |
2106 | * For now we register the efi subsystem with the firmware subsystem | |
2107 | * and the vars subsystem with the efi subsystem. In the future, it | |
2108 | * might make sense to split off the efi subsystem into its own | |
2109 | * driver, but for now only efivars will register with it, so just | |
2110 | * include it here. | |
2111 | */ | |
2112 | ||
2113 | static int __init | |
2114 | efivars_init(void) | |
2115 | { | |
2116 | int error = 0; | |
2117 | ||
2118 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
2119 | EFIVARS_DATE); | |
2120 | ||
83e68189 | 2121 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 2122 | return 0; |
76b53f7c MW |
2123 | |
2124 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
2125 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
2126 | if (!efi_kobj) { | |
2127 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
2128 | return -ENOMEM; | |
2129 | } | |
2130 | ||
4423d779 | 2131 | error = generic_ops_register(); |
3116aabc DC |
2132 | if (error) |
2133 | goto err_put; | |
76b53f7c MW |
2134 | |
2135 | /* Don't forget the systab entry */ | |
2136 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2137 | if (error) { | |
2138 | printk(KERN_ERR | |
2139 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2140 | error); | |
3116aabc | 2141 | goto err_unregister; |
76b53f7c | 2142 | } |
1da177e4 | 2143 | |
3116aabc DC |
2144 | return 0; |
2145 | ||
2146 | err_unregister: | |
4423d779 | 2147 | generic_ops_unregister(); |
3116aabc DC |
2148 | err_put: |
2149 | kobject_put(efi_kobj); | |
1da177e4 LT |
2150 | return error; |
2151 | } | |
2152 | ||
2153 | static void __exit | |
2154 | efivars_exit(void) | |
2155 | { | |
a93bc0c6 SA |
2156 | cancel_work_sync(&efivar_work); |
2157 | ||
83e68189 | 2158 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
4423d779 | 2159 | generic_ops_unregister(); |
aabb6e15 RD |
2160 | kobject_put(efi_kobj); |
2161 | } | |
1da177e4 LT |
2162 | } |
2163 | ||
2164 | module_init(efivars_init); | |
2165 | module_exit(efivars_exit); | |
2166 |