Commit | Line | Data |
---|---|---|
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 | { | |
439 | u64 storage_size, remaining_size, max_size; | |
440 | efi_status_t status; | |
441 | const struct efivar_operations *fops = efivars->ops; | |
442 | ||
443 | if (!efivars->ops->query_variable_info) | |
444 | return EFI_UNSUPPORTED; | |
445 | ||
446 | status = fops->query_variable_info(attributes, &storage_size, | |
447 | &remaining_size, &max_size); | |
448 | ||
449 | if (status != EFI_SUCCESS) | |
450 | return status; | |
451 | ||
452 | if (!storage_size || size > remaining_size || size > max_size || | |
453 | (remaining_size - size) < (storage_size / 2)) | |
454 | return EFI_OUT_OF_RESOURCES; | |
455 | ||
456 | return status; | |
457 | } | |
458 | ||
459 | ||
460 | static efi_status_t | |
461 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
462 | { | |
463 | efi_status_t status; | |
464 | unsigned long flags; | |
465 | ||
466 | spin_lock_irqsave(&efivars->lock, flags); | |
467 | status = check_var_size_locked(efivars, attributes, size); | |
468 | spin_unlock_irqrestore(&efivars->lock, flags); | |
469 | ||
470 | return status; | |
471 | } | |
472 | ||
1da177e4 LT |
473 | static ssize_t |
474 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
475 | { | |
476 | struct efi_variable *var = &entry->var; | |
477 | char *str = buf; | |
478 | ||
479 | if (!entry || !buf) | |
480 | return 0; | |
481 | ||
482 | efi_guid_unparse(&var->VendorGuid, str); | |
483 | str += strlen(str); | |
484 | str += sprintf(str, "\n"); | |
485 | ||
486 | return str - buf; | |
487 | } | |
488 | ||
489 | static ssize_t | |
490 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
491 | { | |
492 | struct efi_variable *var = &entry->var; | |
493 | char *str = buf; | |
494 | efi_status_t status; | |
495 | ||
496 | if (!entry || !buf) | |
497 | return -EINVAL; | |
498 | ||
4142ef14 | 499 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
500 | if (status != EFI_SUCCESS) |
501 | return -EIO; | |
502 | ||
70839090 | 503 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 504 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 505 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 506 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 507 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 508 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
509 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
510 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
511 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
512 | str += sprintf(str, | |
513 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
514 | if (var->Attributes & | |
515 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
516 | str += sprintf(str, | |
517 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
518 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
519 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
520 | return str - buf; |
521 | } | |
522 | ||
523 | static ssize_t | |
524 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
525 | { | |
526 | struct efi_variable *var = &entry->var; | |
527 | char *str = buf; | |
528 | efi_status_t status; | |
529 | ||
530 | if (!entry || !buf) | |
531 | return -EINVAL; | |
532 | ||
4142ef14 | 533 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
534 | if (status != EFI_SUCCESS) |
535 | return -EIO; | |
536 | ||
537 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
538 | return str - buf; | |
539 | } | |
540 | ||
541 | static ssize_t | |
542 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
543 | { | |
544 | struct efi_variable *var = &entry->var; | |
545 | efi_status_t status; | |
546 | ||
547 | if (!entry || !buf) | |
548 | return -EINVAL; | |
549 | ||
4142ef14 | 550 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
551 | if (status != EFI_SUCCESS) |
552 | return -EIO; | |
553 | ||
554 | memcpy(buf, var->Data, var->DataSize); | |
555 | return var->DataSize; | |
556 | } | |
557 | /* | |
558 | * We allow each variable to be edited via rewriting the | |
559 | * entire efi variable structure. | |
560 | */ | |
561 | static ssize_t | |
562 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
563 | { | |
564 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 565 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
566 | efi_status_t status = EFI_NOT_FOUND; |
567 | ||
568 | if (count != sizeof(struct efi_variable)) | |
569 | return -EINVAL; | |
570 | ||
571 | new_var = (struct efi_variable *)buf; | |
572 | /* | |
573 | * If only updating the variable data, then the name | |
574 | * and guid should remain the same | |
575 | */ | |
576 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
577 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
578 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
579 | return -EINVAL; | |
580 | } | |
581 | ||
582 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
583 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
fec6c20b MG |
587 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
588 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
589 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
590 | return -EINVAL; | |
591 | } | |
592 | ||
81fa4e58 | 593 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
594 | |
595 | status = check_var_size_locked(efivars, new_var->Attributes, | |
596 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
597 | ||
598 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
599 | status = efivars->ops->set_variable(new_var->VariableName, | |
600 | &new_var->VendorGuid, | |
601 | new_var->Attributes, | |
602 | new_var->DataSize, | |
603 | new_var->Data); | |
1da177e4 | 604 | |
81fa4e58 | 605 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
606 | |
607 | if (status != EFI_SUCCESS) { | |
608 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
609 | status); | |
610 | return -EIO; | |
611 | } | |
612 | ||
613 | memcpy(&entry->var, new_var, count); | |
614 | return count; | |
615 | } | |
616 | ||
617 | static ssize_t | |
618 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
619 | { | |
620 | struct efi_variable *var = &entry->var; | |
621 | efi_status_t status; | |
622 | ||
623 | if (!entry || !buf) | |
624 | return 0; | |
625 | ||
4142ef14 | 626 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
627 | if (status != EFI_SUCCESS) |
628 | return -EIO; | |
629 | ||
630 | memcpy(buf, var, sizeof(*var)); | |
631 | return sizeof(*var); | |
632 | } | |
633 | ||
634 | /* | |
635 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 636 | * the attributes... |
1da177e4 LT |
637 | */ |
638 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
639 | char *buf) | |
640 | { | |
641 | struct efivar_entry *var = to_efivar_entry(kobj); | |
642 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 643 | ssize_t ret = -EIO; |
1da177e4 LT |
644 | |
645 | if (!capable(CAP_SYS_ADMIN)) | |
646 | return -EACCES; | |
647 | ||
648 | if (efivar_attr->show) { | |
649 | ret = efivar_attr->show(var, buf); | |
650 | } | |
651 | return ret; | |
652 | } | |
653 | ||
654 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
655 | const char *buf, size_t count) | |
656 | { | |
657 | struct efivar_entry *var = to_efivar_entry(kobj); | |
658 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 659 | ssize_t ret = -EIO; |
1da177e4 LT |
660 | |
661 | if (!capable(CAP_SYS_ADMIN)) | |
662 | return -EACCES; | |
663 | ||
664 | if (efivar_attr->store) | |
665 | ret = efivar_attr->store(var, buf, count); | |
666 | ||
667 | return ret; | |
668 | } | |
669 | ||
52cf25d0 | 670 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
671 | .show = efivar_attr_show, |
672 | .store = efivar_attr_store, | |
673 | }; | |
674 | ||
675 | static void efivar_release(struct kobject *kobj) | |
676 | { | |
677 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
678 | kfree(var); |
679 | } | |
680 | ||
681 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
682 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
683 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
684 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
685 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
686 | ||
687 | static struct attribute *def_attrs[] = { | |
688 | &efivar_attr_guid.attr, | |
689 | &efivar_attr_size.attr, | |
690 | &efivar_attr_attributes.attr, | |
691 | &efivar_attr_data.attr, | |
692 | &efivar_attr_raw_var.attr, | |
693 | NULL, | |
694 | }; | |
695 | ||
e89a4116 | 696 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
697 | .release = efivar_release, |
698 | .sysfs_ops = &efivar_attr_ops, | |
699 | .default_attrs = def_attrs, | |
700 | }; | |
701 | ||
1da177e4 LT |
702 | static inline void |
703 | efivar_unregister(struct efivar_entry *var) | |
704 | { | |
c10997f6 | 705 | kobject_put(&var->kobj); |
1da177e4 LT |
706 | } |
707 | ||
5d9db883 MG |
708 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
709 | { | |
710 | file->private_data = inode->i_private; | |
711 | return 0; | |
712 | } | |
713 | ||
7253eaba MF |
714 | static int efi_status_to_err(efi_status_t status) |
715 | { | |
716 | int err; | |
717 | ||
718 | switch (status) { | |
719 | case EFI_INVALID_PARAMETER: | |
720 | err = -EINVAL; | |
721 | break; | |
722 | case EFI_OUT_OF_RESOURCES: | |
723 | err = -ENOSPC; | |
724 | break; | |
725 | case EFI_DEVICE_ERROR: | |
726 | err = -EIO; | |
727 | break; | |
728 | case EFI_WRITE_PROTECTED: | |
729 | err = -EROFS; | |
730 | break; | |
731 | case EFI_SECURITY_VIOLATION: | |
732 | err = -EACCES; | |
733 | break; | |
734 | case EFI_NOT_FOUND: | |
1fa7e695 | 735 | err = -EIO; |
7253eaba MF |
736 | break; |
737 | default: | |
738 | err = -EINVAL; | |
739 | } | |
740 | ||
741 | return err; | |
742 | } | |
743 | ||
5d9db883 MG |
744 | static ssize_t efivarfs_file_write(struct file *file, |
745 | const char __user *userbuf, size_t count, loff_t *ppos) | |
746 | { | |
747 | struct efivar_entry *var = file->private_data; | |
748 | struct efivars *efivars; | |
749 | efi_status_t status; | |
750 | void *data; | |
751 | u32 attributes; | |
752 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 753 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 754 | unsigned long newdatasize, varsize; |
cfcf2f11 | 755 | ssize_t bytes = 0; |
5d9db883 MG |
756 | |
757 | if (count < sizeof(attributes)) | |
758 | return -EINVAL; | |
759 | ||
89d16665 MF |
760 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
761 | return -EFAULT; | |
5d9db883 | 762 | |
89d16665 MF |
763 | if (attributes & ~(EFI_VARIABLE_MASK)) |
764 | return -EINVAL; | |
5d9db883 MG |
765 | |
766 | efivars = var->efivars; | |
767 | ||
89d16665 MF |
768 | /* |
769 | * Ensure that the user can't allocate arbitrarily large | |
770 | * amounts of memory. Pick a default size of 64K if | |
771 | * QueryVariableInfo() isn't supported by the firmware. | |
772 | */ | |
89d16665 | 773 | |
68d92986 MG |
774 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
775 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
776 | |
777 | if (status != EFI_SUCCESS) { | |
778 | if (status != EFI_UNSUPPORTED) | |
779 | return efi_status_to_err(status); | |
780 | ||
68d92986 MG |
781 | if (datasize > 65536) |
782 | return -ENOSPC; | |
5d9db883 MG |
783 | } |
784 | ||
89d16665 MF |
785 | data = kmalloc(datasize, GFP_KERNEL); |
786 | if (!data) | |
787 | return -ENOMEM; | |
788 | ||
5d9db883 | 789 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 790 | bytes = -EFAULT; |
5d9db883 MG |
791 | goto out; |
792 | } | |
793 | ||
794 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 795 | bytes = -EINVAL; |
5d9db883 MG |
796 | goto out; |
797 | } | |
798 | ||
f5f6a60a JK |
799 | /* |
800 | * The lock here protects the get_variable call, the conditional | |
801 | * set_variable call, and removal of the variable from the efivars | |
802 | * list (in the case of an authenticated delete). | |
803 | */ | |
81fa4e58 | 804 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 805 | |
68d92986 MG |
806 | /* |
807 | * Ensure that the available space hasn't shrunk below the safe level | |
808 | */ | |
809 | ||
810 | status = check_var_size_locked(efivars, attributes, varsize); | |
811 | ||
812 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
813 | spin_unlock_irq(&efivars->lock); | |
814 | kfree(data); | |
815 | ||
816 | return efi_status_to_err(status); | |
817 | } | |
818 | ||
5d9db883 MG |
819 | status = efivars->ops->set_variable(var->var.VariableName, |
820 | &var->var.VendorGuid, | |
821 | attributes, datasize, | |
822 | data); | |
823 | ||
f5f6a60a | 824 | if (status != EFI_SUCCESS) { |
81fa4e58 | 825 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
826 | kfree(data); |
827 | ||
7253eaba | 828 | return efi_status_to_err(status); |
5d9db883 | 829 | } |
0c542edd | 830 | |
cfcf2f11 MF |
831 | bytes = count; |
832 | ||
0c542edd JK |
833 | /* |
834 | * Writing to the variable may have caused a change in size (which | |
835 | * could either be an append or an overwrite), or the variable to be | |
836 | * deleted. Perform a GetVariable() so we can tell what actually | |
837 | * happened. | |
838 | */ | |
839 | newdatasize = 0; | |
840 | status = efivars->ops->get_variable(var->var.VariableName, | |
841 | &var->var.VendorGuid, | |
842 | NULL, &newdatasize, | |
843 | NULL); | |
844 | ||
845 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 846 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
847 | mutex_lock(&inode->i_mutex); |
848 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
849 | mutex_unlock(&inode->i_mutex); | |
850 | ||
851 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 852 | list_del(&var->list); |
81fa4e58 | 853 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
854 | efivar_unregister(var); |
855 | drop_nlink(inode); | |
791eb564 | 856 | d_delete(file->f_dentry); |
0c542edd JK |
857 | dput(file->f_dentry); |
858 | ||
859 | } else { | |
81fa4e58 | 860 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
861 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
862 | "status = %lx\n", status); | |
863 | } | |
864 | ||
5d9db883 MG |
865 | out: |
866 | kfree(data); | |
867 | ||
cfcf2f11 | 868 | return bytes; |
5d9db883 MG |
869 | } |
870 | ||
871 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
872 | size_t count, loff_t *ppos) | |
873 | { | |
874 | struct efivar_entry *var = file->private_data; | |
875 | struct efivars *efivars = var->efivars; | |
876 | efi_status_t status; | |
877 | unsigned long datasize = 0; | |
878 | u32 attributes; | |
879 | void *data; | |
d142df03 | 880 | ssize_t size = 0; |
5d9db883 | 881 | |
81fa4e58 | 882 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
883 | status = efivars->ops->get_variable(var->var.VariableName, |
884 | &var->var.VendorGuid, | |
885 | &attributes, &datasize, NULL); | |
81fa4e58 | 886 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
887 | |
888 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 889 | return efi_status_to_err(status); |
5d9db883 | 890 | |
d2923841 | 891 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
892 | |
893 | if (!data) | |
7253eaba | 894 | return -ENOMEM; |
5d9db883 | 895 | |
81fa4e58 | 896 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
897 | status = efivars->ops->get_variable(var->var.VariableName, |
898 | &var->var.VendorGuid, | |
899 | &attributes, &datasize, | |
d2923841 | 900 | (data + sizeof(attributes))); |
81fa4e58 | 901 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 902 | |
7253eaba MF |
903 | if (status != EFI_SUCCESS) { |
904 | size = efi_status_to_err(status); | |
d142df03 | 905 | goto out_free; |
7253eaba | 906 | } |
5d9db883 | 907 | |
d2923841 | 908 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 909 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 910 | data, datasize + sizeof(attributes)); |
d142df03 | 911 | out_free: |
5d9db883 MG |
912 | kfree(data); |
913 | ||
914 | return size; | |
915 | } | |
916 | ||
917 | static void efivarfs_evict_inode(struct inode *inode) | |
918 | { | |
919 | clear_inode(inode); | |
920 | } | |
921 | ||
922 | static const struct super_operations efivarfs_ops = { | |
923 | .statfs = simple_statfs, | |
924 | .drop_inode = generic_delete_inode, | |
925 | .evict_inode = efivarfs_evict_inode, | |
926 | .show_options = generic_show_options, | |
927 | }; | |
928 | ||
929 | static struct super_block *efivarfs_sb; | |
930 | ||
931 | static const struct inode_operations efivarfs_dir_inode_operations; | |
932 | ||
933 | static const struct file_operations efivarfs_file_operations = { | |
934 | .open = efivarfs_file_open, | |
935 | .read = efivarfs_file_read, | |
936 | .write = efivarfs_file_write, | |
937 | .llseek = no_llseek, | |
938 | }; | |
939 | ||
940 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
941 | const struct inode *dir, int mode, dev_t dev) | |
942 | { | |
943 | struct inode *inode = new_inode(sb); | |
944 | ||
945 | if (inode) { | |
946 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
947 | inode->i_mode = mode; |
948 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
949 | switch (mode & S_IFMT) { | |
950 | case S_IFREG: | |
951 | inode->i_fop = &efivarfs_file_operations; | |
952 | break; | |
953 | case S_IFDIR: | |
954 | inode->i_op = &efivarfs_dir_inode_operations; | |
955 | inode->i_fop = &simple_dir_operations; | |
956 | inc_nlink(inode); | |
957 | break; | |
958 | } | |
959 | } | |
960 | return inode; | |
961 | } | |
962 | ||
47f531e8 MF |
963 | /* |
964 | * Return true if 'str' is a valid efivarfs filename of the form, | |
965 | * | |
966 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
967 | */ | |
968 | static bool efivarfs_valid_name(const char *str, int len) | |
969 | { | |
970 | static const char dashes[GUID_LEN] = { | |
971 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
972 | }; | |
973 | const char *s = str + len - GUID_LEN; | |
974 | int i; | |
975 | ||
976 | /* | |
977 | * We need a GUID, plus at least one letter for the variable name, | |
978 | * plus the '-' separator | |
979 | */ | |
980 | if (len < GUID_LEN + 2) | |
981 | return false; | |
982 | ||
123abd76 MF |
983 | /* GUID must be preceded by a '-' */ |
984 | if (*(s - 1) != '-') | |
47f531e8 MF |
985 | return false; |
986 | ||
987 | /* | |
988 | * Validate that 's' is of the correct format, e.g. | |
989 | * | |
990 | * 12345678-1234-1234-1234-123456789abc | |
991 | */ | |
992 | for (i = 0; i < GUID_LEN; i++) { | |
993 | if (dashes[i]) { | |
994 | if (*s++ != '-') | |
995 | return false; | |
996 | } else { | |
997 | if (!isxdigit(*s++)) | |
998 | return false; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | return true; | |
1003 | } | |
1004 | ||
5d9db883 MG |
1005 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
1006 | { | |
1007 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
1008 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
1009 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
1010 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
1011 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
1012 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
1013 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
1014 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
1015 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
1016 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
1017 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
1018 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
1019 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1020 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1021 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1022 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1023 | } | |
1024 | ||
1025 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1026 | umode_t mode, bool excl) | |
1027 | { | |
45a937a8 | 1028 | struct inode *inode; |
5d9db883 MG |
1029 | struct efivars *efivars = &__efivars; |
1030 | struct efivar_entry *var; | |
1031 | int namelen, i = 0, err = 0; | |
1032 | ||
47f531e8 | 1033 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1034 | return -EINVAL; |
1035 | ||
45a937a8 | 1036 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1037 | if (!inode) |
aeeaa8d4 | 1038 | return -ENOMEM; |
5d9db883 MG |
1039 | |
1040 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1041 | if (!var) { |
1042 | err = -ENOMEM; | |
1043 | goto out; | |
1044 | } | |
5d9db883 | 1045 | |
310ad754 JK |
1046 | /* length of the variable name itself: remove GUID and separator */ |
1047 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1048 | |
1049 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1050 | &var->var.VendorGuid); | |
1051 | ||
1052 | for (i = 0; i < namelen; i++) | |
1053 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1054 | ||
1055 | var->var.VariableName[i] = '\0'; | |
1056 | ||
1057 | inode->i_private = var; | |
1058 | var->efivars = efivars; | |
1059 | var->kobj.kset = efivars->kset; | |
1060 | ||
1061 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1062 | dentry->d_name.name); | |
1063 | if (err) | |
1064 | goto out; | |
1065 | ||
1066 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1067 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1068 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1069 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1070 | d_instantiate(dentry, inode); |
1071 | dget(dentry); | |
1072 | out: | |
45a937a8 | 1073 | if (err) { |
5d9db883 | 1074 | kfree(var); |
45a937a8 AW |
1075 | iput(inode); |
1076 | } | |
5d9db883 MG |
1077 | return err; |
1078 | } | |
1079 | ||
1080 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1081 | { | |
1082 | struct efivar_entry *var = dentry->d_inode->i_private; | |
1083 | struct efivars *efivars = var->efivars; | |
1084 | efi_status_t status; | |
1085 | ||
81fa4e58 | 1086 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1087 | |
1088 | status = efivars->ops->set_variable(var->var.VariableName, | |
1089 | &var->var.VendorGuid, | |
1090 | 0, 0, NULL); | |
1091 | ||
1092 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1093 | list_del(&var->list); | |
81fa4e58 | 1094 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1095 | efivar_unregister(var); |
de5fe955 | 1096 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1097 | dput(dentry); |
1098 | return 0; | |
1099 | } | |
1100 | ||
81fa4e58 | 1101 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1102 | return -EINVAL; |
1103 | }; | |
1104 | ||
da27a243 MF |
1105 | /* |
1106 | * Compare two efivarfs file names. | |
1107 | * | |
1108 | * An efivarfs filename is composed of two parts, | |
1109 | * | |
1110 | * 1. A case-sensitive variable name | |
1111 | * 2. A case-insensitive GUID | |
1112 | * | |
1113 | * So we need to perform a case-sensitive match on part 1 and a | |
1114 | * case-insensitive match on part 2. | |
1115 | */ | |
1116 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1117 | const struct dentry *dentry, const struct inode *inode, | |
1118 | unsigned int len, const char *str, | |
1119 | const struct qstr *name) | |
1120 | { | |
1121 | int guid = len - GUID_LEN; | |
1122 | ||
1123 | if (name->len != len) | |
1124 | return 1; | |
1125 | ||
1126 | /* Case-sensitive compare for the variable name */ | |
1127 | if (memcmp(str, name->name, guid)) | |
1128 | return 1; | |
1129 | ||
1130 | /* Case-insensitive compare for the GUID */ | |
1131 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1132 | } | |
1133 | ||
1134 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1135 | const struct inode *inode, struct qstr *qstr) | |
1136 | { | |
1137 | unsigned long hash = init_name_hash(); | |
1138 | const unsigned char *s = qstr->name; | |
1139 | unsigned int len = qstr->len; | |
1140 | ||
1141 | if (!efivarfs_valid_name(s, len)) | |
1142 | return -EINVAL; | |
1143 | ||
1144 | while (len-- > GUID_LEN) | |
1145 | hash = partial_name_hash(*s++, hash); | |
1146 | ||
1147 | /* GUID is case-insensitive. */ | |
1148 | while (len--) | |
1149 | hash = partial_name_hash(tolower(*s++), hash); | |
1150 | ||
1151 | qstr->hash = end_name_hash(hash); | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1157 | * memory and lookup time: arrange for them to be deleted immediately. | |
1158 | */ | |
1159 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1160 | { | |
1161 | return 1; | |
1162 | } | |
1163 | ||
1164 | static struct dentry_operations efivarfs_d_ops = { | |
1165 | .d_compare = efivarfs_d_compare, | |
1166 | .d_hash = efivarfs_d_hash, | |
1167 | .d_delete = efivarfs_delete_dentry, | |
1168 | }; | |
1169 | ||
1170 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1171 | { | |
feff5dc4 | 1172 | struct dentry *d; |
da27a243 | 1173 | struct qstr q; |
feff5dc4 | 1174 | int err; |
da27a243 MF |
1175 | |
1176 | q.name = name; | |
1177 | q.len = strlen(name); | |
1178 | ||
feff5dc4 MF |
1179 | err = efivarfs_d_hash(NULL, NULL, &q); |
1180 | if (err) | |
1181 | return ERR_PTR(err); | |
1182 | ||
1183 | d = d_alloc(parent, &q); | |
1184 | if (d) | |
1185 | return d; | |
da27a243 | 1186 | |
feff5dc4 | 1187 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1188 | } |
1189 | ||
e83af1f1 | 1190 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1191 | { |
1192 | struct inode *inode = NULL; | |
1193 | struct dentry *root; | |
1194 | struct efivar_entry *entry, *n; | |
1195 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1196 | char *name; |
feff5dc4 | 1197 | int err = -ENOMEM; |
5d9db883 MG |
1198 | |
1199 | efivarfs_sb = sb; | |
1200 | ||
1201 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1202 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1203 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1204 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1205 | sb->s_op = &efivarfs_ops; |
da27a243 | 1206 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1207 | sb->s_time_gran = 1; |
1208 | ||
1209 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1210 | if (!inode) |
1211 | return -ENOMEM; | |
5d9db883 MG |
1212 | inode->i_op = &efivarfs_dir_inode_operations; |
1213 | ||
1214 | root = d_make_root(inode); | |
1215 | sb->s_root = root; | |
5c9b50ab AW |
1216 | if (!root) |
1217 | return -ENOMEM; | |
5d9db883 MG |
1218 | |
1219 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1220 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1221 | unsigned long size = 0; |
1222 | int len, i; | |
1223 | ||
5ba6e291 AW |
1224 | inode = NULL; |
1225 | ||
5d9db883 MG |
1226 | len = utf16_strlen(entry->var.VariableName); |
1227 | ||
310ad754 JK |
1228 | /* name, plus '-', plus GUID, plus NUL*/ |
1229 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1230 | if (!name) |
1231 | goto fail; | |
5d9db883 MG |
1232 | |
1233 | for (i = 0; i < len; i++) | |
1234 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1235 | ||
1236 | name[len] = '-'; | |
1237 | ||
1238 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1239 | ||
310ad754 | 1240 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1241 | |
1242 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1243 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1244 | if (!inode) |
1245 | goto fail_name; | |
1246 | ||
da27a243 | 1247 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1248 | if (IS_ERR(dentry)) { |
1249 | err = PTR_ERR(dentry); | |
5ba6e291 | 1250 | goto fail_inode; |
feff5dc4 | 1251 | } |
5ba6e291 | 1252 | |
c0359db1 AW |
1253 | /* copied by the above to local storage in the dentry. */ |
1254 | kfree(name); | |
5d9db883 | 1255 | |
81fa4e58 | 1256 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1257 | efivars->ops->get_variable(entry->var.VariableName, |
1258 | &entry->var.VendorGuid, | |
1259 | &entry->var.Attributes, | |
1260 | &size, | |
1261 | NULL); | |
81fa4e58 | 1262 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1263 | |
1264 | mutex_lock(&inode->i_mutex); | |
1265 | inode->i_private = entry; | |
94a193fb | 1266 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1267 | mutex_unlock(&inode->i_mutex); |
1268 | d_add(dentry, inode); | |
1269 | } | |
1270 | ||
1271 | return 0; | |
5ba6e291 AW |
1272 | |
1273 | fail_inode: | |
1274 | iput(inode); | |
1275 | fail_name: | |
1276 | kfree(name); | |
1277 | fail: | |
feff5dc4 | 1278 | return err; |
5d9db883 MG |
1279 | } |
1280 | ||
1281 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1282 | int flags, const char *dev_name, void *data) | |
1283 | { | |
1284 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1285 | } | |
1286 | ||
1287 | static void efivarfs_kill_sb(struct super_block *sb) | |
1288 | { | |
1289 | kill_litter_super(sb); | |
1290 | efivarfs_sb = NULL; | |
1291 | } | |
1292 | ||
1293 | static struct file_system_type efivarfs_type = { | |
1294 | .name = "efivarfs", | |
1295 | .mount = efivarfs_mount, | |
1296 | .kill_sb = efivarfs_kill_sb, | |
1297 | }; | |
7f78e035 | 1298 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1299 | |
da27a243 MF |
1300 | /* |
1301 | * Handle negative dentry. | |
1302 | */ | |
1303 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1304 | unsigned int flags) | |
1305 | { | |
1306 | if (dentry->d_name.len > NAME_MAX) | |
1307 | return ERR_PTR(-ENAMETOOLONG); | |
1308 | d_add(dentry, NULL); | |
1309 | return NULL; | |
1310 | } | |
1311 | ||
5d9db883 | 1312 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1313 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1314 | .unlink = efivarfs_unlink, |
1315 | .create = efivarfs_create, | |
1316 | }; | |
1317 | ||
ed9dc8ce | 1318 | #ifdef CONFIG_EFI_VARS_PSTORE |
5ee9c198 MG |
1319 | |
1320 | static int efi_pstore_open(struct pstore_info *psi) | |
1321 | { | |
1322 | struct efivars *efivars = psi->data; | |
1323 | ||
81fa4e58 | 1324 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1325 | efivars->walk_entry = list_first_entry(&efivars->list, |
1326 | struct efivar_entry, list); | |
1327 | return 0; | |
1328 | } | |
1329 | ||
1330 | static int efi_pstore_close(struct pstore_info *psi) | |
1331 | { | |
1332 | struct efivars *efivars = psi->data; | |
1333 | ||
81fa4e58 | 1334 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1335 | return 0; |
1336 | } | |
1337 | ||
1338 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1339 | int *count, struct timespec *timespec, |
f6f82851 | 1340 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1341 | { |
1342 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1343 | struct efivars *efivars = psi->data; | |
1344 | char name[DUMP_NAME_LEN]; | |
1345 | int i; | |
755d4fe4 | 1346 | int cnt; |
5ee9c198 MG |
1347 | unsigned int part, size; |
1348 | unsigned long time; | |
1349 | ||
1350 | while (&efivars->walk_entry->list != &efivars->list) { | |
1351 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1352 | vendor)) { | |
1353 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1354 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1355 | } | |
755d4fe4 SA |
1356 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1357 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1358 | *id = part; |
755d4fe4 | 1359 | *count = cnt; |
5ee9c198 MG |
1360 | timespec->tv_sec = time; |
1361 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1362 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1363 | type, &part, &time) == 3) { | |
1364 | /* | |
1365 | * Check if an old format, | |
1366 | * which doesn't support holding | |
1367 | * multiple logs, remains. | |
1368 | */ | |
1369 | *id = part; | |
1370 | *count = 0; | |
1371 | timespec->tv_sec = time; | |
1372 | timespec->tv_nsec = 0; | |
1373 | } else { | |
1374 | efivars->walk_entry = list_entry( | |
1375 | efivars->walk_entry->list.next, | |
1376 | struct efivar_entry, list); | |
1377 | continue; | |
5ee9c198 | 1378 | } |
0f7de85a SA |
1379 | |
1380 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1381 | size = efivars->walk_entry->var.DataSize; | |
1382 | *buf = kmalloc(size, GFP_KERNEL); | |
1383 | if (*buf == NULL) | |
1384 | return -ENOMEM; | |
1385 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1386 | size); | |
1387 | efivars->walk_entry = list_entry( | |
1388 | efivars->walk_entry->list.next, | |
1389 | struct efivar_entry, list); | |
1390 | return size; | |
5ee9c198 MG |
1391 | } |
1392 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1393 | struct efivar_entry, list); | |
1394 | } | |
1395 | return 0; | |
1396 | } | |
1397 | ||
3d6d8d20 KC |
1398 | static int efi_pstore_write(enum pstore_type_id type, |
1399 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1400 | unsigned int part, int count, size_t size, |
1401 | struct pstore_info *psi) | |
5ee9c198 MG |
1402 | { |
1403 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1404 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1405 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1406 | struct efivars *efivars = psi->data; | |
b238b8fa | 1407 | int i, ret = 0; |
d80a361d | 1408 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1409 | unsigned long flags; |
5ee9c198 | 1410 | |
e59310ad SA |
1411 | if (pstore_cannot_block_path(reason)) { |
1412 | /* | |
1413 | * If the lock is taken by another cpu in non-blocking path, | |
1414 | * this driver returns without entering firmware to avoid | |
1415 | * hanging up. | |
1416 | */ | |
81fa4e58 | 1417 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1418 | return -EBUSY; |
1419 | } else | |
81fa4e58 | 1420 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1421 | |
d80a361d SA |
1422 | /* |
1423 | * Check if there is a space enough to log. | |
1424 | * size: a size of logging data | |
1425 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1426 | */ | |
68d92986 MG |
1427 | |
1428 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1429 | size + DUMP_NAME_LEN * 2); | |
1430 | ||
1431 | if (status) { | |
81fa4e58 | 1432 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1433 | *id = part; |
1434 | return -ENOSPC; | |
1435 | } | |
1436 | ||
755d4fe4 | 1437 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1438 | get_seconds()); |
5ee9c198 MG |
1439 | |
1440 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1441 | efi_name[i] = name[i]; | |
1442 | ||
7644c16c | 1443 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1444 | size, psi->buf); |
1445 | ||
81fa4e58 | 1446 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1447 | |
e971318b | 1448 | if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled) |
a93bc0c6 | 1449 | schedule_work(&efivar_work); |
5ee9c198 | 1450 | |
b238b8fa CG |
1451 | *id = part; |
1452 | return ret; | |
5ee9c198 MG |
1453 | }; |
1454 | ||
755d4fe4 | 1455 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1456 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1457 | { |
a9efd39c | 1458 | char name[DUMP_NAME_LEN]; |
dd230fec | 1459 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1460 | char name_old[DUMP_NAME_LEN]; |
1461 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1462 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1463 | struct efivars *efivars = psi->data; | |
1464 | struct efivar_entry *entry, *found = NULL; | |
1465 | int i; | |
1466 | ||
755d4fe4 | 1467 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1468 | time.tv_sec); |
dd230fec | 1469 | |
81fa4e58 | 1470 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1471 | |
1472 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1473 | efi_name[i] = name[i]; |
dd230fec SA |
1474 | |
1475 | /* | |
a9efd39c | 1476 | * Clean up an entry with the same name |
dd230fec SA |
1477 | */ |
1478 | ||
1479 | list_for_each_entry(entry, &efivars->list, list) { | |
1480 | get_var_data_locked(efivars, &entry->var); | |
1481 | ||
1482 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1483 | continue; | |
1484 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1485 | utf16_strlen(efi_name))) { |
1486 | /* | |
1487 | * Check if an old format, | |
1488 | * which doesn't support holding | |
1489 | * multiple logs, remains. | |
1490 | */ | |
1491 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1492 | (unsigned int)id, time.tv_sec); | |
1493 | ||
1494 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1495 | efi_name_old[i] = name_old[i]; | |
1496 | ||
1497 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1498 | utf16_strlen(efi_name_old))) | |
1499 | continue; | |
1500 | } | |
dd230fec SA |
1501 | |
1502 | /* found */ | |
1503 | found = entry; | |
1504 | efivars->ops->set_variable(entry->var.VariableName, | |
1505 | &entry->var.VendorGuid, | |
1506 | PSTORE_EFI_ATTRIBUTES, | |
1507 | 0, NULL); | |
a9efd39c | 1508 | break; |
dd230fec SA |
1509 | } |
1510 | ||
1511 | if (found) | |
1512 | list_del(&found->list); | |
1513 | ||
81fa4e58 | 1514 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1515 | |
1516 | if (found) | |
1517 | efivar_unregister(found); | |
5ee9c198 MG |
1518 | |
1519 | return 0; | |
1520 | } | |
5ee9c198 MG |
1521 | |
1522 | static struct pstore_info efi_pstore_info = { | |
1523 | .owner = THIS_MODULE, | |
1524 | .name = "efi", | |
1525 | .open = efi_pstore_open, | |
1526 | .close = efi_pstore_close, | |
1527 | .read = efi_pstore_read, | |
1528 | .write = efi_pstore_write, | |
1529 | .erase = efi_pstore_erase, | |
1530 | }; | |
1da177e4 | 1531 | |
ed9dc8ce SF |
1532 | static void efivar_pstore_register(struct efivars *efivars) |
1533 | { | |
1534 | efivars->efi_pstore_info = efi_pstore_info; | |
1535 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1536 | if (efivars->efi_pstore_info.buf) { | |
1537 | efivars->efi_pstore_info.bufsize = 1024; | |
1538 | efivars->efi_pstore_info.data = efivars; | |
1539 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); | |
1540 | pstore_register(&efivars->efi_pstore_info); | |
1541 | } | |
1542 | } | |
1543 | #else | |
1544 | static void efivar_pstore_register(struct efivars *efivars) | |
1545 | { | |
1546 | return; | |
1547 | } | |
1548 | #endif | |
1549 | ||
2c3c8bea | 1550 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1551 | struct bin_attribute *bin_attr, |
1552 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1553 | { |
1554 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1555 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1556 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1557 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1558 | efi_status_t status = EFI_NOT_FOUND; |
1559 | int found = 0; | |
1560 | ||
1561 | if (!capable(CAP_SYS_ADMIN)) | |
1562 | return -EACCES; | |
1563 | ||
fec6c20b MG |
1564 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1565 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1566 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1567 | return -EINVAL; | |
1568 | } | |
1569 | ||
81fa4e58 | 1570 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1571 | |
1572 | /* | |
1573 | * Does this variable already exist? | |
1574 | */ | |
29422693 | 1575 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1576 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1577 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1578 | if (strsize1 == strsize2 && |
1579 | !memcmp(&(search_efivar->var.VariableName), | |
1580 | new_var->VariableName, strsize1) && | |
1581 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1582 | new_var->VendorGuid)) { | |
1583 | found = 1; | |
1584 | break; | |
1585 | } | |
1586 | } | |
1587 | if (found) { | |
81fa4e58 | 1588 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1589 | return -EINVAL; |
1590 | } | |
1591 | ||
68d92986 MG |
1592 | status = check_var_size_locked(efivars, new_var->Attributes, |
1593 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1594 | ||
1595 | if (status && status != EFI_UNSUPPORTED) { | |
1596 | spin_unlock_irq(&efivars->lock); | |
1597 | return efi_status_to_err(status); | |
1598 | } | |
1599 | ||
1da177e4 | 1600 | /* now *really* create the variable via EFI */ |
3295814d MW |
1601 | status = efivars->ops->set_variable(new_var->VariableName, |
1602 | &new_var->VendorGuid, | |
1603 | new_var->Attributes, | |
1604 | new_var->DataSize, | |
1605 | new_var->Data); | |
1da177e4 LT |
1606 | |
1607 | if (status != EFI_SUCCESS) { | |
1608 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1609 | status); | |
81fa4e58 | 1610 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1611 | return -EIO; |
1612 | } | |
81fa4e58 | 1613 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1614 | |
1615 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1616 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1617 | utf16_strsize(new_var->VariableName, |
1618 | 1024), | |
4142ef14 MW |
1619 | new_var->VariableName, |
1620 | &new_var->VendorGuid); | |
1da177e4 LT |
1621 | if (status) { |
1622 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1623 | } | |
1624 | return count; | |
1625 | } | |
1626 | ||
2c3c8bea | 1627 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1628 | struct bin_attribute *bin_attr, |
1629 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1630 | { |
1631 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1632 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1633 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1634 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1635 | efi_status_t status = EFI_NOT_FOUND; |
1636 | int found = 0; | |
1637 | ||
1638 | if (!capable(CAP_SYS_ADMIN)) | |
1639 | return -EACCES; | |
1640 | ||
81fa4e58 | 1641 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1642 | |
1643 | /* | |
1644 | * Does this variable already exist? | |
1645 | */ | |
29422693 | 1646 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1647 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1648 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1649 | if (strsize1 == strsize2 && |
1650 | !memcmp(&(search_efivar->var.VariableName), | |
1651 | del_var->VariableName, strsize1) && | |
1652 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1653 | del_var->VendorGuid)) { | |
1654 | found = 1; | |
1655 | break; | |
1656 | } | |
1657 | } | |
1658 | if (!found) { | |
81fa4e58 | 1659 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1660 | return -EINVAL; |
1661 | } | |
1662 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1663 | del_var->Attributes = 0; | |
1664 | del_var->DataSize = 0; | |
1665 | ||
3295814d MW |
1666 | status = efivars->ops->set_variable(del_var->VariableName, |
1667 | &del_var->VendorGuid, | |
1668 | del_var->Attributes, | |
1669 | del_var->DataSize, | |
1670 | del_var->Data); | |
1da177e4 LT |
1671 | |
1672 | if (status != EFI_SUCCESS) { | |
1673 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1674 | status); | |
81fa4e58 | 1675 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1676 | return -EIO; |
1677 | } | |
496a0fc8 | 1678 | list_del(&search_efivar->list); |
1da177e4 | 1679 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1680 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1681 | efivar_unregister(search_efivar); |
1682 | ||
1683 | /* It's dead Jim.... */ | |
1684 | return count; | |
1685 | } | |
1686 | ||
a93bc0c6 SA |
1687 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1688 | { | |
1689 | struct efivar_entry *entry, *n; | |
1690 | struct efivars *efivars = &__efivars; | |
1691 | unsigned long strsize1, strsize2; | |
1692 | bool found = false; | |
1693 | ||
1694 | strsize1 = utf16_strsize(variable_name, 1024); | |
1695 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1696 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1697 | if (strsize1 == strsize2 && | |
1698 | !memcmp(variable_name, &(entry->var.VariableName), | |
1699 | strsize2) && | |
1700 | !efi_guidcmp(entry->var.VendorGuid, | |
1701 | *vendor)) { | |
1702 | found = true; | |
1703 | break; | |
1704 | } | |
1705 | } | |
1706 | return found; | |
1707 | } | |
1708 | ||
ec50bd32 MF |
1709 | /* |
1710 | * Returns the size of variable_name, in bytes, including the | |
1711 | * terminating NULL character, or variable_name_size if no NULL | |
1712 | * character is found among the first variable_name_size bytes. | |
1713 | */ | |
1714 | static unsigned long var_name_strnsize(efi_char16_t *variable_name, | |
1715 | unsigned long variable_name_size) | |
1716 | { | |
1717 | unsigned long len; | |
1718 | efi_char16_t c; | |
1719 | ||
1720 | /* | |
1721 | * The variable name is, by definition, a NULL-terminated | |
1722 | * string, so make absolutely sure that variable_name_size is | |
1723 | * the value we expect it to be. If not, return the real size. | |
1724 | */ | |
1725 | for (len = 2; len <= variable_name_size; len += sizeof(c)) { | |
1726 | c = variable_name[(len / sizeof(c)) - 1]; | |
1727 | if (!c) | |
1728 | break; | |
1729 | } | |
1730 | ||
1731 | return min(len, variable_name_size); | |
1732 | } | |
1733 | ||
a93bc0c6 SA |
1734 | static void efivar_update_sysfs_entries(struct work_struct *work) |
1735 | { | |
1736 | struct efivars *efivars = &__efivars; | |
1737 | efi_guid_t vendor; | |
1738 | efi_char16_t *variable_name; | |
1739 | unsigned long variable_name_size = 1024; | |
1740 | efi_status_t status = EFI_NOT_FOUND; | |
1741 | bool found; | |
1742 | ||
1743 | /* Add new sysfs entries */ | |
1744 | while (1) { | |
1745 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1746 | if (!variable_name) { | |
1747 | pr_err("efivars: Memory allocation failed.\n"); | |
1748 | return; | |
1749 | } | |
1750 | ||
1751 | spin_lock_irq(&efivars->lock); | |
1752 | found = false; | |
1753 | while (1) { | |
1754 | variable_name_size = 1024; | |
1755 | status = efivars->ops->get_next_variable( | |
1756 | &variable_name_size, | |
1757 | variable_name, | |
1758 | &vendor); | |
1759 | if (status != EFI_SUCCESS) { | |
1760 | break; | |
1761 | } else { | |
1762 | if (!variable_is_present(variable_name, | |
1763 | &vendor)) { | |
1764 | found = true; | |
1765 | break; | |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | spin_unlock_irq(&efivars->lock); | |
1770 | ||
1771 | if (!found) { | |
1772 | kfree(variable_name); | |
1773 | break; | |
ec50bd32 MF |
1774 | } else { |
1775 | variable_name_size = var_name_strnsize(variable_name, | |
1776 | variable_name_size); | |
a93bc0c6 SA |
1777 | efivar_create_sysfs_entry(efivars, |
1778 | variable_name_size, | |
1779 | variable_name, &vendor); | |
ec50bd32 | 1780 | } |
a93bc0c6 SA |
1781 | } |
1782 | } | |
1783 | ||
1da177e4 LT |
1784 | /* |
1785 | * Let's not leave out systab information that snuck into | |
1786 | * the efivars driver | |
1787 | */ | |
334c6307 GKH |
1788 | static ssize_t systab_show(struct kobject *kobj, |
1789 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1790 | { |
1791 | char *str = buf; | |
1792 | ||
334c6307 | 1793 | if (!kobj || !buf) |
1da177e4 LT |
1794 | return -EINVAL; |
1795 | ||
b2c99e3c BH |
1796 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1797 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1798 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1799 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1800 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1801 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1802 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1803 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1804 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1805 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1806 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1807 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1808 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1809 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1810 | |
1811 | return str - buf; | |
1812 | } | |
1813 | ||
334c6307 GKH |
1814 | static struct kobj_attribute efi_attr_systab = |
1815 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1816 | |
334c6307 GKH |
1817 | static struct attribute *efi_subsys_attrs[] = { |
1818 | &efi_attr_systab.attr, | |
1da177e4 LT |
1819 | NULL, /* maybe more in the future? */ |
1820 | }; | |
1821 | ||
334c6307 GKH |
1822 | static struct attribute_group efi_subsys_attr_group = { |
1823 | .attrs = efi_subsys_attrs, | |
1824 | }; | |
1825 | ||
bc87d2fe | 1826 | static struct kobject *efi_kobj; |
1da177e4 LT |
1827 | |
1828 | /* | |
1829 | * efivar_create_sysfs_entry() | |
1830 | * Requires: | |
1831 | * variable_name_size = number of bytes required to hold | |
1832 | * variable_name (not counting the NULL | |
1833 | * character at the end. | |
29422693 | 1834 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1835 | * Returns 1 on failure, 0 on success |
1836 | */ | |
1837 | static int | |
4142ef14 MW |
1838 | efivar_create_sysfs_entry(struct efivars *efivars, |
1839 | unsigned long variable_name_size, | |
1840 | efi_char16_t *variable_name, | |
1841 | efi_guid_t *vendor_guid) | |
1da177e4 | 1842 | { |
310ad754 | 1843 | int i, short_name_size; |
1da177e4 LT |
1844 | char *short_name; |
1845 | struct efivar_entry *new_efivar; | |
1846 | ||
310ad754 JK |
1847 | /* |
1848 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1849 | * plus the GUID, plus trailing NUL | |
1850 | */ | |
1851 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1852 | + 1 + GUID_LEN + 1; | |
1853 | ||
1854 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1855 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1856 | |
1857 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1858 | kfree(short_name); |
1859 | kfree(new_efivar); | |
1da177e4 LT |
1860 | return 1; |
1861 | } | |
1da177e4 | 1862 | |
4142ef14 | 1863 | new_efivar->efivars = efivars; |
1da177e4 LT |
1864 | memcpy(new_efivar->var.VariableName, variable_name, |
1865 | variable_name_size); | |
1866 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1867 | ||
1868 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1869 | ala UTF-8 */ | |
1870 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1871 | short_name[i] = variable_name[i] & 0xFF; | |
1872 | } | |
1873 | /* This is ugly, but necessary to separate one vendor's | |
1874 | private variables from another's. */ | |
1875 | ||
1876 | *(short_name + strlen(short_name)) = '-'; | |
1877 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1878 | ||
29422693 | 1879 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1880 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1881 | "%s", short_name); | |
69b2186c JG |
1882 | if (i) { |
1883 | kfree(short_name); | |
1884 | kfree(new_efivar); | |
1885 | return 1; | |
1886 | } | |
1da177e4 | 1887 | |
d6d292c4 | 1888 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1889 | kfree(short_name); |
1890 | short_name = NULL; | |
1da177e4 | 1891 | |
81fa4e58 | 1892 | spin_lock_irq(&efivars->lock); |
29422693 | 1893 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1894 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1895 | |
1896 | return 0; | |
1897 | } | |
d502fbb0 MW |
1898 | |
1899 | static int | |
1900 | create_efivars_bin_attributes(struct efivars *efivars) | |
1901 | { | |
1902 | struct bin_attribute *attr; | |
1903 | int error; | |
1904 | ||
1905 | /* new_var */ | |
1906 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1907 | if (!attr) | |
1908 | return -ENOMEM; | |
1909 | ||
1910 | attr->attr.name = "new_var"; | |
1911 | attr->attr.mode = 0200; | |
1912 | attr->write = efivar_create; | |
1913 | attr->private = efivars; | |
1914 | efivars->new_var = attr; | |
1915 | ||
1916 | /* del_var */ | |
1917 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1918 | if (!attr) { | |
1919 | error = -ENOMEM; | |
1920 | goto out_free; | |
1921 | } | |
1922 | attr->attr.name = "del_var"; | |
1923 | attr->attr.mode = 0200; | |
1924 | attr->write = efivar_delete; | |
1925 | attr->private = efivars; | |
1926 | efivars->del_var = attr; | |
1927 | ||
1928 | sysfs_bin_attr_init(efivars->new_var); | |
1929 | sysfs_bin_attr_init(efivars->del_var); | |
1930 | ||
1931 | /* Register */ | |
1932 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1933 | efivars->new_var); | |
1934 | if (error) { | |
1935 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1936 | " due to error %d\n", error); | |
1937 | goto out_free; | |
1938 | } | |
1939 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1940 | efivars->del_var); | |
1941 | if (error) { | |
1942 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1943 | " due to error %d\n", error); | |
1944 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1945 | efivars->new_var); | |
1946 | goto out_free; | |
1947 | } | |
1948 | ||
1949 | return 0; | |
1950 | out_free: | |
051d51bc DC |
1951 | kfree(efivars->del_var); |
1952 | efivars->del_var = NULL; | |
d502fbb0 MW |
1953 | kfree(efivars->new_var); |
1954 | efivars->new_var = NULL; | |
1955 | return error; | |
1956 | } | |
1957 | ||
4fc756bd | 1958 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1959 | { |
1960 | struct efivar_entry *entry, *n; | |
4142ef14 | 1961 | |
76b53f7c | 1962 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1963 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1964 | list_del(&entry->list); |
81fa4e58 | 1965 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1966 | efivar_unregister(entry); |
1967 | } | |
1968 | if (efivars->new_var) | |
1969 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1970 | if (efivars->del_var) | |
1971 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1972 | kfree(efivars->new_var); | |
1973 | kfree(efivars->del_var); | |
605e70c7 | 1974 | kobject_put(efivars->kobject); |
76b53f7c MW |
1975 | kset_unregister(efivars->kset); |
1976 | } | |
4fc756bd | 1977 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1978 | |
e971318b MF |
1979 | /* |
1980 | * Print a warning when duplicate EFI variables are encountered and | |
1981 | * disable the sysfs workqueue since the firmware is buggy. | |
1982 | */ | |
1983 | static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid, | |
1984 | unsigned long len16) | |
1985 | { | |
1986 | size_t i, len8 = len16 / sizeof(efi_char16_t); | |
1987 | char *s8; | |
1988 | ||
1989 | /* | |
1990 | * Disable the workqueue since the algorithm it uses for | |
1991 | * detecting new variables won't work with this buggy | |
1992 | * implementation of GetNextVariableName(). | |
1993 | */ | |
1994 | efivar_wq_enabled = false; | |
1995 | ||
1996 | s8 = kzalloc(len8, GFP_KERNEL); | |
1997 | if (!s8) | |
1998 | return; | |
1999 | ||
2000 | for (i = 0; i < len8; i++) | |
2001 | s8[i] = s16[i]; | |
2002 | ||
2003 | printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n", | |
2004 | s8, vendor_guid); | |
2005 | kfree(s8); | |
2006 | } | |
2007 | ||
4fc756bd MW |
2008 | int register_efivars(struct efivars *efivars, |
2009 | const struct efivar_operations *ops, | |
2010 | struct kobject *parent_kobj) | |
1da177e4 LT |
2011 | { |
2012 | efi_status_t status = EFI_NOT_FOUND; | |
2013 | efi_guid_t vendor_guid; | |
2014 | efi_char16_t *variable_name; | |
1da177e4 | 2015 | unsigned long variable_name_size = 1024; |
334c6307 | 2016 | int error = 0; |
1da177e4 | 2017 | |
9c215384 | 2018 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
2019 | if (!variable_name) { |
2020 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
2021 | return -ENOMEM; | |
2022 | } | |
2023 | ||
29422693 MW |
2024 | spin_lock_init(&efivars->lock); |
2025 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 2026 | efivars->ops = ops; |
29422693 | 2027 | |
76b53f7c | 2028 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 2029 | if (!efivars->kset) { |
66ac831e GKH |
2030 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
2031 | error = -ENOMEM; | |
76b53f7c | 2032 | goto out; |
1da177e4 LT |
2033 | } |
2034 | ||
605e70c7 LCY |
2035 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
2036 | if (!efivars->kobject) { | |
2037 | pr_err("efivars: Subsystem registration failed.\n"); | |
2038 | error = -ENOMEM; | |
2039 | kset_unregister(efivars->kset); | |
2040 | goto out; | |
2041 | } | |
2042 | ||
1da177e4 LT |
2043 | /* |
2044 | * Per EFI spec, the maximum storage allocated for both | |
2045 | * the variable name and variable data is 1024 bytes. | |
2046 | */ | |
2047 | ||
2048 | do { | |
2049 | variable_name_size = 1024; | |
2050 | ||
3295814d | 2051 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2052 | variable_name, |
2053 | &vendor_guid); | |
2054 | switch (status) { | |
2055 | case EFI_SUCCESS: | |
ec50bd32 MF |
2056 | variable_name_size = var_name_strnsize(variable_name, |
2057 | variable_name_size); | |
e971318b MF |
2058 | |
2059 | /* | |
2060 | * Some firmware implementations return the | |
2061 | * same variable name on multiple calls to | |
2062 | * get_next_variable(). Terminate the loop | |
2063 | * immediately as there is no guarantee that | |
2064 | * we'll ever see a different variable name, | |
2065 | * and may end up looping here forever. | |
2066 | */ | |
2067 | if (variable_is_present(variable_name, &vendor_guid)) { | |
2068 | dup_variable_bug(variable_name, &vendor_guid, | |
2069 | variable_name_size); | |
2070 | status = EFI_NOT_FOUND; | |
2071 | break; | |
2072 | } | |
2073 | ||
4142ef14 MW |
2074 | efivar_create_sysfs_entry(efivars, |
2075 | variable_name_size, | |
2076 | variable_name, | |
2077 | &vendor_guid); | |
1da177e4 LT |
2078 | break; |
2079 | case EFI_NOT_FOUND: | |
2080 | break; | |
2081 | default: | |
2082 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2083 | status); | |
2084 | status = EFI_NOT_FOUND; | |
2085 | break; | |
2086 | } | |
2087 | } while (status != EFI_NOT_FOUND); | |
2088 | ||
d502fbb0 | 2089 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2090 | if (error) |
76b53f7c | 2091 | unregister_efivars(efivars); |
1da177e4 | 2092 | |
ec0971ba SF |
2093 | if (!efivars_pstore_disable) |
2094 | efivar_pstore_register(efivars); | |
5ee9c198 | 2095 | |
5d9db883 MG |
2096 | register_filesystem(&efivarfs_type); |
2097 | ||
76b53f7c MW |
2098 | out: |
2099 | kfree(variable_name); | |
1da177e4 | 2100 | |
76b53f7c MW |
2101 | return error; |
2102 | } | |
4fc756bd | 2103 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 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 | ||
3295814d MW |
2131 | ops.get_variable = efi.get_variable; |
2132 | ops.set_variable = efi.set_variable; | |
2133 | ops.get_next_variable = efi.get_next_variable; | |
d80a361d | 2134 | ops.query_variable_info = efi.query_variable_info; |
89d16665 | 2135 | |
3295814d | 2136 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
2137 | if (error) |
2138 | goto err_put; | |
76b53f7c MW |
2139 | |
2140 | /* Don't forget the systab entry */ | |
2141 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2142 | if (error) { | |
2143 | printk(KERN_ERR | |
2144 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2145 | error); | |
3116aabc | 2146 | goto err_unregister; |
76b53f7c | 2147 | } |
1da177e4 | 2148 | |
3116aabc DC |
2149 | return 0; |
2150 | ||
2151 | err_unregister: | |
2152 | unregister_efivars(&__efivars); | |
2153 | err_put: | |
2154 | kobject_put(efi_kobj); | |
1da177e4 LT |
2155 | return error; |
2156 | } | |
2157 | ||
2158 | static void __exit | |
2159 | efivars_exit(void) | |
2160 | { | |
a93bc0c6 SA |
2161 | cancel_work_sync(&efivar_work); |
2162 | ||
83e68189 | 2163 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
2164 | unregister_efivars(&__efivars); |
2165 | kobject_put(efi_kobj); | |
2166 | } | |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | module_init(efivars_init); | |
2170 | module_exit(efivars_exit); | |
2171 |