Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * EFI Variables - efivars.c | |
3 | * | |
4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> | |
5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> | |
6 | * | |
7 | * This code takes all variables accessible from EFI runtime and | |
8 | * exports them via sysfs | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Changelog: | |
25 | * | |
26 | * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
27 | * remove check for efi_enabled in exit | |
28 | * add MODULE_VERSION | |
29 | * | |
30 | * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
31 | * minor bug fixes | |
32 | * | |
33 | * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) | |
34 | * converted driver to export variable information via sysfs | |
35 | * and moved to drivers/firmware directory | |
36 | * bumped revision number to v0.07 to reflect conversion & move | |
37 | * | |
38 | * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
39 | * fix locking per Peter Chubb's findings | |
40 | * | |
41 | * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
42 | * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() | |
43 | * | |
44 | * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
45 | * use list_for_each_safe when deleting vars. | |
46 | * remove ifdef CONFIG_SMP around include <linux/smp.h> | |
47 | * v0.04 release to linux-ia64@linuxia64.org | |
48 | * | |
49 | * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
50 | * Moved vars from /proc/efi to /proc/efi/vars, and made | |
51 | * efi.c own the /proc/efi directory. | |
52 | * v0.03 release to linux-ia64@linuxia64.org | |
53 | * | |
54 | * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
55 | * At the request of Stephane, moved ownership of /proc/efi | |
56 | * to efi.c, and now efivars lives under /proc/efi/vars. | |
57 | * | |
58 | * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
59 | * Feedback received from Stephane Eranian incorporated. | |
60 | * efivar_write() checks copy_from_user() return value. | |
61 | * efivar_read/write() returns proper errno. | |
62 | * v0.02 release to linux-ia64@linuxia64.org | |
63 | * | |
64 | * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
65 | * v0.01 release to linux-ia64@linuxia64.org | |
66 | */ | |
67 | ||
c59ede7b | 68 | #include <linux/capability.h> |
1da177e4 LT |
69 | #include <linux/types.h> |
70 | #include <linux/errno.h> | |
71 | #include <linux/init.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/module.h> | |
74 | #include <linux/string.h> | |
75 | #include <linux/smp.h> | |
76 | #include <linux/efi.h> | |
77 | #include <linux/sysfs.h> | |
78 | #include <linux/kobject.h> | |
79 | #include <linux/device.h> | |
5a0e3ad6 | 80 | #include <linux/slab.h> |
5ee9c198 | 81 | #include <linux/pstore.h> |
1da177e4 LT |
82 | |
83 | #include <asm/uaccess.h> | |
84 | ||
85 | #define EFIVARS_VERSION "0.08" | |
86 | #define EFIVARS_DATE "2004-May-17" | |
87 | ||
88 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
89 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
90 | MODULE_LICENSE("GPL"); | |
91 | MODULE_VERSION(EFIVARS_VERSION); | |
92 | ||
5ee9c198 MG |
93 | #define DUMP_NAME_LEN 52 |
94 | ||
1da177e4 LT |
95 | /* |
96 | * The maximum size of VariableName + Data = 1024 | |
97 | * Therefore, it's reasonable to save that much | |
98 | * space in each part of the structure, | |
99 | * and we use a page for reading/writing. | |
100 | */ | |
101 | ||
102 | struct efi_variable { | |
103 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
104 | efi_guid_t VendorGuid; | |
105 | unsigned long DataSize; | |
106 | __u8 Data[1024]; | |
107 | efi_status_t Status; | |
108 | __u32 Attributes; | |
109 | } __attribute__((packed)); | |
110 | ||
111 | ||
112 | struct efivar_entry { | |
4142ef14 | 113 | struct efivars *efivars; |
1da177e4 LT |
114 | struct efi_variable var; |
115 | struct list_head list; | |
116 | struct kobject kobj; | |
117 | }; | |
118 | ||
1da177e4 LT |
119 | struct efivar_attribute { |
120 | struct attribute attr; | |
121 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
122 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
123 | }; | |
124 | ||
7644c16c MW |
125 | #define PSTORE_EFI_ATTRIBUTES \ |
126 | (EFI_VARIABLE_NON_VOLATILE | \ | |
127 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
128 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 129 | |
1da177e4 LT |
130 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
131 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 132 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
133 | .show = _show, \ |
134 | .store = _store, \ | |
135 | }; | |
136 | ||
1da177e4 LT |
137 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
138 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
139 | ||
140 | /* | |
141 | * Prototype for sysfs creation function | |
142 | */ | |
143 | static int | |
4142ef14 MW |
144 | efivar_create_sysfs_entry(struct efivars *efivars, |
145 | unsigned long variable_name_size, | |
146 | efi_char16_t *variable_name, | |
147 | efi_guid_t *vendor_guid); | |
1da177e4 LT |
148 | |
149 | /* Return the number of unicode characters in data */ | |
150 | static unsigned long | |
a2940908 | 151 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
152 | { |
153 | unsigned long length = 0; | |
154 | ||
a2940908 | 155 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
156 | length++; |
157 | return length; | |
158 | } | |
159 | ||
b728a5c8 | 160 | static inline unsigned long |
a2940908 MW |
161 | utf16_strlen(efi_char16_t *s) |
162 | { | |
163 | return utf16_strnlen(s, ~0UL); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | /* |
167 | * Return the number of bytes is the length of this string | |
168 | * Note: this is NOT the same as the number of unicode characters | |
169 | */ | |
170 | static inline unsigned long | |
a2940908 | 171 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 172 | { |
a2940908 | 173 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
174 | } |
175 | ||
828aa1f0 MW |
176 | static inline int |
177 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
178 | { | |
179 | while (1) { | |
180 | if (len == 0) | |
181 | return 0; | |
182 | if (*a < *b) | |
183 | return -1; | |
184 | if (*a > *b) | |
185 | return 1; | |
186 | if (*a == 0) /* implies *b == 0 */ | |
187 | return 0; | |
188 | a++; | |
189 | b++; | |
190 | len--; | |
191 | } | |
192 | } | |
193 | ||
fec6c20b | 194 | static bool |
54b3a4d3 MG |
195 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
196 | unsigned long len) | |
fec6c20b MG |
197 | { |
198 | struct efi_generic_dev_path *node; | |
199 | int offset = 0; | |
200 | ||
201 | node = (struct efi_generic_dev_path *)buffer; | |
202 | ||
54b3a4d3 MG |
203 | if (len < sizeof(*node)) |
204 | return false; | |
fec6c20b | 205 | |
54b3a4d3 MG |
206 | while (offset <= len - sizeof(*node) && |
207 | node->length >= sizeof(*node) && | |
208 | node->length <= len - offset) { | |
209 | offset += node->length; | |
fec6c20b MG |
210 | |
211 | if ((node->type == EFI_DEV_END_PATH || | |
212 | node->type == EFI_DEV_END_PATH2) && | |
213 | node->sub_type == EFI_DEV_END_ENTIRE) | |
214 | return true; | |
215 | ||
216 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
217 | } | |
218 | ||
219 | /* | |
220 | * If we're here then either node->length pointed past the end | |
221 | * of the buffer or we reached the end of the buffer without | |
222 | * finding a device path end node. | |
223 | */ | |
224 | return false; | |
225 | } | |
226 | ||
227 | static bool | |
54b3a4d3 MG |
228 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
229 | unsigned long len) | |
fec6c20b MG |
230 | { |
231 | /* An array of 16-bit integers */ | |
232 | if ((len % 2) != 0) | |
233 | return false; | |
234 | ||
235 | return true; | |
236 | } | |
237 | ||
238 | static bool | |
54b3a4d3 MG |
239 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
240 | unsigned long len) | |
fec6c20b MG |
241 | { |
242 | u16 filepathlength; | |
54b3a4d3 MG |
243 | int i, desclength = 0, namelen; |
244 | ||
245 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
246 | |
247 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
248 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
249 | if (var->VariableName[i] > 127 || |
250 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
251 | return true; |
252 | } | |
253 | ||
54b3a4d3 MG |
254 | /* Reject it if there's 4 digits of hex and then further content */ |
255 | if (namelen > match + 4) | |
256 | return false; | |
257 | ||
258 | /* A valid entry must be at least 8 bytes */ | |
259 | if (len < 8) | |
fec6c20b MG |
260 | return false; |
261 | ||
262 | filepathlength = buffer[4] | buffer[5] << 8; | |
263 | ||
264 | /* | |
265 | * There's no stored length for the description, so it has to be | |
266 | * found by hand | |
267 | */ | |
54b3a4d3 | 268 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
269 | |
270 | /* Each boot entry must have a descriptor */ | |
271 | if (!desclength) | |
272 | return false; | |
273 | ||
274 | /* | |
275 | * If the sum of the length of the description, the claimed filepath | |
276 | * length and the original header are greater than the length of the | |
277 | * variable, it's malformed | |
278 | */ | |
279 | if ((desclength + filepathlength + 6) > len) | |
280 | return false; | |
281 | ||
282 | /* | |
283 | * And, finally, check the filepath | |
284 | */ | |
285 | return validate_device_path(var, match, buffer + desclength + 6, | |
286 | filepathlength); | |
287 | } | |
288 | ||
289 | static bool | |
54b3a4d3 MG |
290 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
291 | unsigned long len) | |
fec6c20b MG |
292 | { |
293 | /* A single 16-bit integer */ | |
294 | if (len != 2) | |
295 | return false; | |
296 | ||
297 | return true; | |
298 | } | |
299 | ||
300 | static bool | |
54b3a4d3 MG |
301 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
302 | unsigned long len) | |
fec6c20b MG |
303 | { |
304 | int i; | |
305 | ||
306 | for (i = 0; i < len; i++) { | |
307 | if (buffer[i] > 127) | |
308 | return false; | |
309 | ||
310 | if (buffer[i] == 0) | |
311 | return true; | |
312 | } | |
313 | ||
314 | return false; | |
315 | } | |
316 | ||
317 | struct variable_validate { | |
318 | char *name; | |
319 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 320 | unsigned long len); |
fec6c20b MG |
321 | }; |
322 | ||
323 | static const struct variable_validate variable_validate[] = { | |
324 | { "BootNext", validate_uint16 }, | |
325 | { "BootOrder", validate_boot_order }, | |
326 | { "DriverOrder", validate_boot_order }, | |
327 | { "Boot*", validate_load_option }, | |
328 | { "Driver*", validate_load_option }, | |
329 | { "ConIn", validate_device_path }, | |
330 | { "ConInDev", validate_device_path }, | |
331 | { "ConOut", validate_device_path }, | |
332 | { "ConOutDev", validate_device_path }, | |
333 | { "ErrOut", validate_device_path }, | |
334 | { "ErrOutDev", validate_device_path }, | |
335 | { "Timeout", validate_uint16 }, | |
336 | { "Lang", validate_ascii_string }, | |
337 | { "PlatformLang", validate_ascii_string }, | |
338 | { "", NULL }, | |
339 | }; | |
340 | ||
341 | static bool | |
54b3a4d3 | 342 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
343 | { |
344 | int i; | |
345 | u16 *unicode_name = var->VariableName; | |
346 | ||
347 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
348 | const char *name = variable_validate[i].name; | |
349 | int match; | |
350 | ||
351 | for (match = 0; ; match++) { | |
352 | char c = name[match]; | |
353 | u16 u = unicode_name[match]; | |
354 | ||
355 | /* All special variables are plain ascii */ | |
356 | if (u > 127) | |
357 | return true; | |
358 | ||
359 | /* Wildcard in the matching name means we've matched */ | |
360 | if (c == '*') | |
361 | return variable_validate[i].validate(var, | |
362 | match, data, len); | |
363 | ||
364 | /* Case sensitive match */ | |
365 | if (c != u) | |
366 | break; | |
367 | ||
368 | /* Reached the end of the string while matching */ | |
369 | if (!c) | |
370 | return variable_validate[i].validate(var, | |
371 | match, data, len); | |
372 | } | |
373 | } | |
374 | ||
375 | return true; | |
376 | } | |
377 | ||
1da177e4 | 378 | static efi_status_t |
5ee9c198 | 379 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
380 | { |
381 | efi_status_t status; | |
382 | ||
1da177e4 | 383 | var->DataSize = 1024; |
3295814d MW |
384 | status = efivars->ops->get_variable(var->VariableName, |
385 | &var->VendorGuid, | |
386 | &var->Attributes, | |
387 | &var->DataSize, | |
388 | var->Data); | |
5ee9c198 MG |
389 | return status; |
390 | } | |
391 | ||
392 | static efi_status_t | |
393 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
394 | { | |
395 | efi_status_t status; | |
396 | ||
397 | spin_lock(&efivars->lock); | |
398 | status = get_var_data_locked(efivars, var); | |
29422693 | 399 | spin_unlock(&efivars->lock); |
5ee9c198 | 400 | |
1da177e4 LT |
401 | if (status != EFI_SUCCESS) { |
402 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
403 | status); | |
404 | } | |
405 | return status; | |
406 | } | |
407 | ||
408 | static ssize_t | |
409 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
410 | { | |
411 | struct efi_variable *var = &entry->var; | |
412 | char *str = buf; | |
413 | ||
414 | if (!entry || !buf) | |
415 | return 0; | |
416 | ||
417 | efi_guid_unparse(&var->VendorGuid, str); | |
418 | str += strlen(str); | |
419 | str += sprintf(str, "\n"); | |
420 | ||
421 | return str - buf; | |
422 | } | |
423 | ||
424 | static ssize_t | |
425 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
426 | { | |
427 | struct efi_variable *var = &entry->var; | |
428 | char *str = buf; | |
429 | efi_status_t status; | |
430 | ||
431 | if (!entry || !buf) | |
432 | return -EINVAL; | |
433 | ||
4142ef14 | 434 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
435 | if (status != EFI_SUCCESS) |
436 | return -EIO; | |
437 | ||
438 | if (var->Attributes & 0x1) | |
439 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); | |
440 | if (var->Attributes & 0x2) | |
441 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); | |
442 | if (var->Attributes & 0x4) | |
443 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); | |
444 | return str - buf; | |
445 | } | |
446 | ||
447 | static ssize_t | |
448 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
449 | { | |
450 | struct efi_variable *var = &entry->var; | |
451 | char *str = buf; | |
452 | efi_status_t status; | |
453 | ||
454 | if (!entry || !buf) | |
455 | return -EINVAL; | |
456 | ||
4142ef14 | 457 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
458 | if (status != EFI_SUCCESS) |
459 | return -EIO; | |
460 | ||
461 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
462 | return str - buf; | |
463 | } | |
464 | ||
465 | static ssize_t | |
466 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
467 | { | |
468 | struct efi_variable *var = &entry->var; | |
469 | efi_status_t status; | |
470 | ||
471 | if (!entry || !buf) | |
472 | return -EINVAL; | |
473 | ||
4142ef14 | 474 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
475 | if (status != EFI_SUCCESS) |
476 | return -EIO; | |
477 | ||
478 | memcpy(buf, var->Data, var->DataSize); | |
479 | return var->DataSize; | |
480 | } | |
481 | /* | |
482 | * We allow each variable to be edited via rewriting the | |
483 | * entire efi variable structure. | |
484 | */ | |
485 | static ssize_t | |
486 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
487 | { | |
488 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 489 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
490 | efi_status_t status = EFI_NOT_FOUND; |
491 | ||
492 | if (count != sizeof(struct efi_variable)) | |
493 | return -EINVAL; | |
494 | ||
495 | new_var = (struct efi_variable *)buf; | |
496 | /* | |
497 | * If only updating the variable data, then the name | |
498 | * and guid should remain the same | |
499 | */ | |
500 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
501 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
502 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
503 | return -EINVAL; | |
504 | } | |
505 | ||
506 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
507 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
508 | return -EINVAL; | |
509 | } | |
510 | ||
fec6c20b MG |
511 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
512 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
513 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
514 | return -EINVAL; | |
515 | } | |
516 | ||
29422693 | 517 | spin_lock(&efivars->lock); |
3295814d MW |
518 | status = efivars->ops->set_variable(new_var->VariableName, |
519 | &new_var->VendorGuid, | |
520 | new_var->Attributes, | |
521 | new_var->DataSize, | |
522 | new_var->Data); | |
1da177e4 | 523 | |
29422693 | 524 | spin_unlock(&efivars->lock); |
1da177e4 LT |
525 | |
526 | if (status != EFI_SUCCESS) { | |
527 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
528 | status); | |
529 | return -EIO; | |
530 | } | |
531 | ||
532 | memcpy(&entry->var, new_var, count); | |
533 | return count; | |
534 | } | |
535 | ||
536 | static ssize_t | |
537 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
538 | { | |
539 | struct efi_variable *var = &entry->var; | |
540 | efi_status_t status; | |
541 | ||
542 | if (!entry || !buf) | |
543 | return 0; | |
544 | ||
4142ef14 | 545 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
546 | if (status != EFI_SUCCESS) |
547 | return -EIO; | |
548 | ||
549 | memcpy(buf, var, sizeof(*var)); | |
550 | return sizeof(*var); | |
551 | } | |
552 | ||
553 | /* | |
554 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 555 | * the attributes... |
1da177e4 LT |
556 | */ |
557 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
558 | char *buf) | |
559 | { | |
560 | struct efivar_entry *var = to_efivar_entry(kobj); | |
561 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 562 | ssize_t ret = -EIO; |
1da177e4 LT |
563 | |
564 | if (!capable(CAP_SYS_ADMIN)) | |
565 | return -EACCES; | |
566 | ||
567 | if (efivar_attr->show) { | |
568 | ret = efivar_attr->show(var, buf); | |
569 | } | |
570 | return ret; | |
571 | } | |
572 | ||
573 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
574 | const char *buf, size_t count) | |
575 | { | |
576 | struct efivar_entry *var = to_efivar_entry(kobj); | |
577 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 578 | ssize_t ret = -EIO; |
1da177e4 LT |
579 | |
580 | if (!capable(CAP_SYS_ADMIN)) | |
581 | return -EACCES; | |
582 | ||
583 | if (efivar_attr->store) | |
584 | ret = efivar_attr->store(var, buf, count); | |
585 | ||
586 | return ret; | |
587 | } | |
588 | ||
52cf25d0 | 589 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
590 | .show = efivar_attr_show, |
591 | .store = efivar_attr_store, | |
592 | }; | |
593 | ||
594 | static void efivar_release(struct kobject *kobj) | |
595 | { | |
596 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
597 | kfree(var); |
598 | } | |
599 | ||
600 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
601 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
602 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
603 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
604 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
605 | ||
606 | static struct attribute *def_attrs[] = { | |
607 | &efivar_attr_guid.attr, | |
608 | &efivar_attr_size.attr, | |
609 | &efivar_attr_attributes.attr, | |
610 | &efivar_attr_data.attr, | |
611 | &efivar_attr_raw_var.attr, | |
612 | NULL, | |
613 | }; | |
614 | ||
e89a4116 | 615 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
616 | .release = efivar_release, |
617 | .sysfs_ops = &efivar_attr_ops, | |
618 | .default_attrs = def_attrs, | |
619 | }; | |
620 | ||
5ee9c198 MG |
621 | static struct pstore_info efi_pstore_info; |
622 | ||
1da177e4 LT |
623 | static inline void |
624 | efivar_unregister(struct efivar_entry *var) | |
625 | { | |
c10997f6 | 626 | kobject_put(&var->kobj); |
1da177e4 LT |
627 | } |
628 | ||
5ee9c198 MG |
629 | #ifdef CONFIG_PSTORE |
630 | ||
631 | static int efi_pstore_open(struct pstore_info *psi) | |
632 | { | |
633 | struct efivars *efivars = psi->data; | |
634 | ||
635 | spin_lock(&efivars->lock); | |
636 | efivars->walk_entry = list_first_entry(&efivars->list, | |
637 | struct efivar_entry, list); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | static int efi_pstore_close(struct pstore_info *psi) | |
642 | { | |
643 | struct efivars *efivars = psi->data; | |
644 | ||
645 | spin_unlock(&efivars->lock); | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
f6f82851 KC |
650 | struct timespec *timespec, |
651 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
652 | { |
653 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
654 | struct efivars *efivars = psi->data; | |
655 | char name[DUMP_NAME_LEN]; | |
656 | int i; | |
657 | unsigned int part, size; | |
658 | unsigned long time; | |
659 | ||
660 | while (&efivars->walk_entry->list != &efivars->list) { | |
661 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
662 | vendor)) { | |
663 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
664 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
665 | } | |
666 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { | |
667 | *id = part; | |
668 | timespec->tv_sec = time; | |
669 | timespec->tv_nsec = 0; | |
670 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
671 | size = efivars->walk_entry->var.DataSize; | |
f6f82851 KC |
672 | *buf = kmalloc(size, GFP_KERNEL); |
673 | if (*buf == NULL) | |
674 | return -ENOMEM; | |
675 | memcpy(*buf, efivars->walk_entry->var.Data, | |
676 | size); | |
5ee9c198 MG |
677 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
678 | struct efivar_entry, list); | |
679 | return size; | |
680 | } | |
681 | } | |
682 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
683 | struct efivar_entry, list); | |
684 | } | |
685 | return 0; | |
686 | } | |
687 | ||
3d6d8d20 KC |
688 | static int efi_pstore_write(enum pstore_type_id type, |
689 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 690 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
691 | { |
692 | char name[DUMP_NAME_LEN]; | |
693 | char stub_name[DUMP_NAME_LEN]; | |
694 | efi_char16_t efi_name[DUMP_NAME_LEN]; | |
695 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
696 | struct efivars *efivars = psi->data; | |
697 | struct efivar_entry *entry, *found = NULL; | |
b238b8fa | 698 | int i, ret = 0; |
5ee9c198 MG |
699 | |
700 | sprintf(stub_name, "dump-type%u-%u-", type, part); | |
701 | sprintf(name, "%s%lu", stub_name, get_seconds()); | |
702 | ||
703 | spin_lock(&efivars->lock); | |
704 | ||
705 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
706 | efi_name[i] = stub_name[i]; | |
707 | ||
708 | /* | |
709 | * Clean up any entries with the same name | |
710 | */ | |
711 | ||
712 | list_for_each_entry(entry, &efivars->list, list) { | |
713 | get_var_data_locked(efivars, &entry->var); | |
714 | ||
c475594d MW |
715 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
716 | continue; | |
717 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
718 | utf16_strlen(efi_name))) | |
719 | continue; | |
720 | /* Needs to be a prefix */ | |
721 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) | |
722 | continue; | |
723 | ||
724 | /* found */ | |
725 | found = entry; | |
7644c16c MW |
726 | efivars->ops->set_variable(entry->var.VariableName, |
727 | &entry->var.VendorGuid, | |
728 | PSTORE_EFI_ATTRIBUTES, | |
c475594d | 729 | 0, NULL); |
5ee9c198 MG |
730 | } |
731 | ||
732 | if (found) | |
733 | list_del(&found->list); | |
734 | ||
735 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
736 | efi_name[i] = name[i]; | |
737 | ||
7644c16c | 738 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
739 | size, psi->buf); |
740 | ||
741 | spin_unlock(&efivars->lock); | |
742 | ||
743 | if (found) | |
744 | efivar_unregister(found); | |
745 | ||
746 | if (size) | |
b238b8fa | 747 | ret = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
748 | utf16_strsize(efi_name, |
749 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
750 | efi_name, &vendor); |
751 | ||
b238b8fa CG |
752 | *id = part; |
753 | return ret; | |
5ee9c198 MG |
754 | }; |
755 | ||
756 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
757 | struct pstore_info *psi) | |
758 | { | |
3d6d8d20 | 759 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
5ee9c198 MG |
760 | |
761 | return 0; | |
762 | } | |
763 | #else | |
764 | static int efi_pstore_open(struct pstore_info *psi) | |
765 | { | |
766 | return 0; | |
767 | } | |
768 | ||
769 | static int efi_pstore_close(struct pstore_info *psi) | |
770 | { | |
771 | return 0; | |
772 | } | |
773 | ||
774 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
eee628da CF |
775 | struct timespec *timespec, |
776 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
777 | { |
778 | return -1; | |
779 | } | |
780 | ||
3d6d8d20 KC |
781 | static int efi_pstore_write(enum pstore_type_id type, |
782 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 783 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
784 | { |
785 | return 0; | |
786 | } | |
787 | ||
788 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
789 | struct pstore_info *psi) | |
790 | { | |
791 | return 0; | |
792 | } | |
793 | #endif | |
794 | ||
795 | static struct pstore_info efi_pstore_info = { | |
796 | .owner = THIS_MODULE, | |
797 | .name = "efi", | |
798 | .open = efi_pstore_open, | |
799 | .close = efi_pstore_close, | |
800 | .read = efi_pstore_read, | |
801 | .write = efi_pstore_write, | |
802 | .erase = efi_pstore_erase, | |
803 | }; | |
1da177e4 | 804 | |
2c3c8bea | 805 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
806 | struct bin_attribute *bin_attr, |
807 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
808 | { |
809 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 810 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 811 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 812 | unsigned long strsize1, strsize2; |
1da177e4 LT |
813 | efi_status_t status = EFI_NOT_FOUND; |
814 | int found = 0; | |
815 | ||
816 | if (!capable(CAP_SYS_ADMIN)) | |
817 | return -EACCES; | |
818 | ||
fec6c20b MG |
819 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
820 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
821 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
822 | return -EINVAL; | |
823 | } | |
824 | ||
29422693 | 825 | spin_lock(&efivars->lock); |
1da177e4 LT |
826 | |
827 | /* | |
828 | * Does this variable already exist? | |
829 | */ | |
29422693 | 830 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
831 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
832 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
833 | if (strsize1 == strsize2 && |
834 | !memcmp(&(search_efivar->var.VariableName), | |
835 | new_var->VariableName, strsize1) && | |
836 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
837 | new_var->VendorGuid)) { | |
838 | found = 1; | |
839 | break; | |
840 | } | |
841 | } | |
842 | if (found) { | |
29422693 | 843 | spin_unlock(&efivars->lock); |
1da177e4 LT |
844 | return -EINVAL; |
845 | } | |
846 | ||
847 | /* now *really* create the variable via EFI */ | |
3295814d MW |
848 | status = efivars->ops->set_variable(new_var->VariableName, |
849 | &new_var->VendorGuid, | |
850 | new_var->Attributes, | |
851 | new_var->DataSize, | |
852 | new_var->Data); | |
1da177e4 LT |
853 | |
854 | if (status != EFI_SUCCESS) { | |
855 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
856 | status); | |
29422693 | 857 | spin_unlock(&efivars->lock); |
1da177e4 LT |
858 | return -EIO; |
859 | } | |
29422693 | 860 | spin_unlock(&efivars->lock); |
1da177e4 LT |
861 | |
862 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 863 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
864 | utf16_strsize(new_var->VariableName, |
865 | 1024), | |
4142ef14 MW |
866 | new_var->VariableName, |
867 | &new_var->VendorGuid); | |
1da177e4 LT |
868 | if (status) { |
869 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
870 | } | |
871 | return count; | |
872 | } | |
873 | ||
2c3c8bea | 874 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
875 | struct bin_attribute *bin_attr, |
876 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
877 | { |
878 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 879 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 880 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 881 | unsigned long strsize1, strsize2; |
1da177e4 LT |
882 | efi_status_t status = EFI_NOT_FOUND; |
883 | int found = 0; | |
884 | ||
885 | if (!capable(CAP_SYS_ADMIN)) | |
886 | return -EACCES; | |
887 | ||
29422693 | 888 | spin_lock(&efivars->lock); |
1da177e4 LT |
889 | |
890 | /* | |
891 | * Does this variable already exist? | |
892 | */ | |
29422693 | 893 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
894 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
895 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
896 | if (strsize1 == strsize2 && |
897 | !memcmp(&(search_efivar->var.VariableName), | |
898 | del_var->VariableName, strsize1) && | |
899 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
900 | del_var->VendorGuid)) { | |
901 | found = 1; | |
902 | break; | |
903 | } | |
904 | } | |
905 | if (!found) { | |
29422693 | 906 | spin_unlock(&efivars->lock); |
1da177e4 LT |
907 | return -EINVAL; |
908 | } | |
909 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
910 | del_var->Attributes = 0; | |
911 | del_var->DataSize = 0; | |
912 | ||
3295814d MW |
913 | status = efivars->ops->set_variable(del_var->VariableName, |
914 | &del_var->VendorGuid, | |
915 | del_var->Attributes, | |
916 | del_var->DataSize, | |
917 | del_var->Data); | |
1da177e4 LT |
918 | |
919 | if (status != EFI_SUCCESS) { | |
920 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
921 | status); | |
29422693 | 922 | spin_unlock(&efivars->lock); |
1da177e4 LT |
923 | return -EIO; |
924 | } | |
496a0fc8 | 925 | list_del(&search_efivar->list); |
1da177e4 | 926 | /* We need to release this lock before unregistering. */ |
29422693 | 927 | spin_unlock(&efivars->lock); |
1da177e4 LT |
928 | efivar_unregister(search_efivar); |
929 | ||
930 | /* It's dead Jim.... */ | |
931 | return count; | |
932 | } | |
933 | ||
1da177e4 LT |
934 | /* |
935 | * Let's not leave out systab information that snuck into | |
936 | * the efivars driver | |
937 | */ | |
334c6307 GKH |
938 | static ssize_t systab_show(struct kobject *kobj, |
939 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
940 | { |
941 | char *str = buf; | |
942 | ||
334c6307 | 943 | if (!kobj || !buf) |
1da177e4 LT |
944 | return -EINVAL; |
945 | ||
b2c99e3c BH |
946 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
947 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
948 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
949 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
950 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
951 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
952 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
953 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
954 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
955 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
956 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
957 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
958 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
959 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
960 | |
961 | return str - buf; | |
962 | } | |
963 | ||
334c6307 GKH |
964 | static struct kobj_attribute efi_attr_systab = |
965 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 966 | |
334c6307 GKH |
967 | static struct attribute *efi_subsys_attrs[] = { |
968 | &efi_attr_systab.attr, | |
1da177e4 LT |
969 | NULL, /* maybe more in the future? */ |
970 | }; | |
971 | ||
334c6307 GKH |
972 | static struct attribute_group efi_subsys_attr_group = { |
973 | .attrs = efi_subsys_attrs, | |
974 | }; | |
975 | ||
bc87d2fe | 976 | static struct kobject *efi_kobj; |
1da177e4 LT |
977 | |
978 | /* | |
979 | * efivar_create_sysfs_entry() | |
980 | * Requires: | |
981 | * variable_name_size = number of bytes required to hold | |
982 | * variable_name (not counting the NULL | |
983 | * character at the end. | |
29422693 | 984 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
985 | * Returns 1 on failure, 0 on success |
986 | */ | |
987 | static int | |
4142ef14 MW |
988 | efivar_create_sysfs_entry(struct efivars *efivars, |
989 | unsigned long variable_name_size, | |
990 | efi_char16_t *variable_name, | |
991 | efi_guid_t *vendor_guid) | |
1da177e4 LT |
992 | { |
993 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | |
994 | char *short_name; | |
995 | struct efivar_entry *new_efivar; | |
996 | ||
9c215384 DS |
997 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
998 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
1da177e4 LT |
999 | |
1000 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1001 | kfree(short_name); |
1002 | kfree(new_efivar); | |
1da177e4 LT |
1003 | return 1; |
1004 | } | |
1da177e4 | 1005 | |
4142ef14 | 1006 | new_efivar->efivars = efivars; |
1da177e4 LT |
1007 | memcpy(new_efivar->var.VariableName, variable_name, |
1008 | variable_name_size); | |
1009 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1010 | ||
1011 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1012 | ala UTF-8 */ | |
1013 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1014 | short_name[i] = variable_name[i] & 0xFF; | |
1015 | } | |
1016 | /* This is ugly, but necessary to separate one vendor's | |
1017 | private variables from another's. */ | |
1018 | ||
1019 | *(short_name + strlen(short_name)) = '-'; | |
1020 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1021 | ||
29422693 | 1022 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1023 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1024 | "%s", short_name); | |
69b2186c JG |
1025 | if (i) { |
1026 | kfree(short_name); | |
1027 | kfree(new_efivar); | |
1028 | return 1; | |
1029 | } | |
1da177e4 | 1030 | |
d6d292c4 | 1031 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1032 | kfree(short_name); |
1033 | short_name = NULL; | |
1da177e4 | 1034 | |
29422693 MW |
1035 | spin_lock(&efivars->lock); |
1036 | list_add(&new_efivar->list, &efivars->list); | |
1037 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
1038 | |
1039 | return 0; | |
1040 | } | |
d502fbb0 MW |
1041 | |
1042 | static int | |
1043 | create_efivars_bin_attributes(struct efivars *efivars) | |
1044 | { | |
1045 | struct bin_attribute *attr; | |
1046 | int error; | |
1047 | ||
1048 | /* new_var */ | |
1049 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1050 | if (!attr) | |
1051 | return -ENOMEM; | |
1052 | ||
1053 | attr->attr.name = "new_var"; | |
1054 | attr->attr.mode = 0200; | |
1055 | attr->write = efivar_create; | |
1056 | attr->private = efivars; | |
1057 | efivars->new_var = attr; | |
1058 | ||
1059 | /* del_var */ | |
1060 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1061 | if (!attr) { | |
1062 | error = -ENOMEM; | |
1063 | goto out_free; | |
1064 | } | |
1065 | attr->attr.name = "del_var"; | |
1066 | attr->attr.mode = 0200; | |
1067 | attr->write = efivar_delete; | |
1068 | attr->private = efivars; | |
1069 | efivars->del_var = attr; | |
1070 | ||
1071 | sysfs_bin_attr_init(efivars->new_var); | |
1072 | sysfs_bin_attr_init(efivars->del_var); | |
1073 | ||
1074 | /* Register */ | |
1075 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1076 | efivars->new_var); | |
1077 | if (error) { | |
1078 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1079 | " due to error %d\n", error); | |
1080 | goto out_free; | |
1081 | } | |
1082 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1083 | efivars->del_var); | |
1084 | if (error) { | |
1085 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1086 | " due to error %d\n", error); | |
1087 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1088 | efivars->new_var); | |
1089 | goto out_free; | |
1090 | } | |
1091 | ||
1092 | return 0; | |
1093 | out_free: | |
051d51bc DC |
1094 | kfree(efivars->del_var); |
1095 | efivars->del_var = NULL; | |
d502fbb0 MW |
1096 | kfree(efivars->new_var); |
1097 | efivars->new_var = NULL; | |
1098 | return error; | |
1099 | } | |
1100 | ||
4fc756bd | 1101 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1102 | { |
1103 | struct efivar_entry *entry, *n; | |
4142ef14 | 1104 | |
76b53f7c MW |
1105 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
1106 | spin_lock(&efivars->lock); | |
1107 | list_del(&entry->list); | |
1108 | spin_unlock(&efivars->lock); | |
1109 | efivar_unregister(entry); | |
1110 | } | |
1111 | if (efivars->new_var) | |
1112 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1113 | if (efivars->del_var) | |
1114 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1115 | kfree(efivars->new_var); | |
1116 | kfree(efivars->del_var); | |
1117 | kset_unregister(efivars->kset); | |
1118 | } | |
4fc756bd | 1119 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1120 | |
4fc756bd MW |
1121 | int register_efivars(struct efivars *efivars, |
1122 | const struct efivar_operations *ops, | |
1123 | struct kobject *parent_kobj) | |
1da177e4 LT |
1124 | { |
1125 | efi_status_t status = EFI_NOT_FOUND; | |
1126 | efi_guid_t vendor_guid; | |
1127 | efi_char16_t *variable_name; | |
1da177e4 | 1128 | unsigned long variable_name_size = 1024; |
334c6307 | 1129 | int error = 0; |
1da177e4 | 1130 | |
9c215384 | 1131 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1132 | if (!variable_name) { |
1133 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1134 | return -ENOMEM; | |
1135 | } | |
1136 | ||
29422693 MW |
1137 | spin_lock_init(&efivars->lock); |
1138 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1139 | efivars->ops = ops; |
29422693 | 1140 | |
76b53f7c | 1141 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1142 | if (!efivars->kset) { |
66ac831e GKH |
1143 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1144 | error = -ENOMEM; | |
76b53f7c | 1145 | goto out; |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | /* | |
1149 | * Per EFI spec, the maximum storage allocated for both | |
1150 | * the variable name and variable data is 1024 bytes. | |
1151 | */ | |
1152 | ||
1153 | do { | |
1154 | variable_name_size = 1024; | |
1155 | ||
3295814d | 1156 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
1157 | variable_name, |
1158 | &vendor_guid); | |
1159 | switch (status) { | |
1160 | case EFI_SUCCESS: | |
4142ef14 MW |
1161 | efivar_create_sysfs_entry(efivars, |
1162 | variable_name_size, | |
1163 | variable_name, | |
1164 | &vendor_guid); | |
1da177e4 LT |
1165 | break; |
1166 | case EFI_NOT_FOUND: | |
1167 | break; | |
1168 | default: | |
1169 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
1170 | status); | |
1171 | status = EFI_NOT_FOUND; | |
1172 | break; | |
1173 | } | |
1174 | } while (status != EFI_NOT_FOUND); | |
1175 | ||
d502fbb0 | 1176 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 1177 | if (error) |
76b53f7c | 1178 | unregister_efivars(efivars); |
1da177e4 | 1179 | |
5ee9c198 MG |
1180 | efivars->efi_pstore_info = efi_pstore_info; |
1181 | ||
1182 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1183 | if (efivars->efi_pstore_info.buf) { | |
1184 | efivars->efi_pstore_info.bufsize = 1024; | |
1185 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 1186 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
1187 | pstore_register(&efivars->efi_pstore_info); |
1188 | } | |
1189 | ||
76b53f7c MW |
1190 | out: |
1191 | kfree(variable_name); | |
1da177e4 | 1192 | |
76b53f7c MW |
1193 | return error; |
1194 | } | |
4fc756bd | 1195 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 1196 | |
76b53f7c | 1197 | static struct efivars __efivars; |
3295814d | 1198 | static struct efivar_operations ops; |
76b53f7c MW |
1199 | |
1200 | /* | |
1201 | * For now we register the efi subsystem with the firmware subsystem | |
1202 | * and the vars subsystem with the efi subsystem. In the future, it | |
1203 | * might make sense to split off the efi subsystem into its own | |
1204 | * driver, but for now only efivars will register with it, so just | |
1205 | * include it here. | |
1206 | */ | |
1207 | ||
1208 | static int __init | |
1209 | efivars_init(void) | |
1210 | { | |
1211 | int error = 0; | |
1212 | ||
1213 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1214 | EFIVARS_DATE); | |
1215 | ||
1216 | if (!efi_enabled) | |
4fc756bd | 1217 | return 0; |
76b53f7c MW |
1218 | |
1219 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1220 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1221 | if (!efi_kobj) { | |
1222 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1223 | return -ENOMEM; | |
1224 | } | |
1225 | ||
3295814d MW |
1226 | ops.get_variable = efi.get_variable; |
1227 | ops.set_variable = efi.set_variable; | |
1228 | ops.get_next_variable = efi.get_next_variable; | |
1229 | error = register_efivars(&__efivars, &ops, efi_kobj); | |
3116aabc DC |
1230 | if (error) |
1231 | goto err_put; | |
76b53f7c MW |
1232 | |
1233 | /* Don't forget the systab entry */ | |
1234 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1235 | if (error) { | |
1236 | printk(KERN_ERR | |
1237 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1238 | error); | |
3116aabc | 1239 | goto err_unregister; |
76b53f7c | 1240 | } |
1da177e4 | 1241 | |
3116aabc DC |
1242 | return 0; |
1243 | ||
1244 | err_unregister: | |
1245 | unregister_efivars(&__efivars); | |
1246 | err_put: | |
1247 | kobject_put(efi_kobj); | |
1da177e4 LT |
1248 | return error; |
1249 | } | |
1250 | ||
1251 | static void __exit | |
1252 | efivars_exit(void) | |
1253 | { | |
aabb6e15 RD |
1254 | if (efi_enabled) { |
1255 | unregister_efivars(&__efivars); | |
1256 | kobject_put(efi_kobj); | |
1257 | } | |
1da177e4 LT |
1258 | } |
1259 | ||
1260 | module_init(efivars_init); | |
1261 | module_exit(efivars_exit); | |
1262 |