Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * EFI Variables - efivars.c | |
3 | * | |
4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> | |
5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> | |
6 | * | |
7 | * This code takes all variables accessible from EFI runtime and | |
8 | * exports them via sysfs | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Changelog: | |
25 | * | |
26 | * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
27 | * remove check for efi_enabled in exit | |
28 | * add MODULE_VERSION | |
29 | * | |
30 | * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
31 | * minor bug fixes | |
32 | * | |
33 | * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) | |
34 | * converted driver to export variable information via sysfs | |
35 | * and moved to drivers/firmware directory | |
36 | * bumped revision number to v0.07 to reflect conversion & move | |
37 | * | |
38 | * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
39 | * fix locking per Peter Chubb's findings | |
40 | * | |
41 | * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
42 | * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() | |
43 | * | |
44 | * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
45 | * use list_for_each_safe when deleting vars. | |
46 | * remove ifdef CONFIG_SMP around include <linux/smp.h> | |
47 | * v0.04 release to linux-ia64@linuxia64.org | |
48 | * | |
49 | * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
50 | * Moved vars from /proc/efi to /proc/efi/vars, and made | |
51 | * efi.c own the /proc/efi directory. | |
52 | * v0.03 release to linux-ia64@linuxia64.org | |
53 | * | |
54 | * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
55 | * At the request of Stephane, moved ownership of /proc/efi | |
56 | * to efi.c, and now efivars lives under /proc/efi/vars. | |
57 | * | |
58 | * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
59 | * Feedback received from Stephane Eranian incorporated. | |
60 | * efivar_write() checks copy_from_user() return value. | |
61 | * efivar_read/write() returns proper errno. | |
62 | * v0.02 release to linux-ia64@linuxia64.org | |
63 | * | |
64 | * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
65 | * v0.01 release to linux-ia64@linuxia64.org | |
66 | */ | |
67 | ||
c59ede7b | 68 | #include <linux/capability.h> |
1da177e4 LT |
69 | #include <linux/types.h> |
70 | #include <linux/errno.h> | |
71 | #include <linux/init.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/module.h> | |
74 | #include <linux/string.h> | |
75 | #include <linux/smp.h> | |
76 | #include <linux/efi.h> | |
77 | #include <linux/sysfs.h> | |
78 | #include <linux/kobject.h> | |
79 | #include <linux/device.h> | |
5a0e3ad6 | 80 | #include <linux/slab.h> |
5ee9c198 | 81 | #include <linux/pstore.h> |
1da177e4 | 82 | |
5d9db883 MG |
83 | #include <linux/fs.h> |
84 | #include <linux/ramfs.h> | |
85 | #include <linux/pagemap.h> | |
86 | ||
1da177e4 LT |
87 | #include <asm/uaccess.h> |
88 | ||
89 | #define EFIVARS_VERSION "0.08" | |
90 | #define EFIVARS_DATE "2004-May-17" | |
91 | ||
92 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
93 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
94 | MODULE_LICENSE("GPL"); | |
95 | MODULE_VERSION(EFIVARS_VERSION); | |
96 | ||
5ee9c198 MG |
97 | #define DUMP_NAME_LEN 52 |
98 | ||
310ad754 JK |
99 | /* |
100 | * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")) | |
101 | * not including trailing NUL | |
102 | */ | |
103 | #define GUID_LEN 36 | |
5ee9c198 | 104 | |
1da177e4 LT |
105 | /* |
106 | * The maximum size of VariableName + Data = 1024 | |
107 | * Therefore, it's reasonable to save that much | |
108 | * space in each part of the structure, | |
109 | * and we use a page for reading/writing. | |
110 | */ | |
111 | ||
112 | struct efi_variable { | |
113 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
114 | efi_guid_t VendorGuid; | |
115 | unsigned long DataSize; | |
116 | __u8 Data[1024]; | |
117 | efi_status_t Status; | |
118 | __u32 Attributes; | |
119 | } __attribute__((packed)); | |
120 | ||
1da177e4 | 121 | struct efivar_entry { |
4142ef14 | 122 | struct efivars *efivars; |
1da177e4 LT |
123 | struct efi_variable var; |
124 | struct list_head list; | |
125 | struct kobject kobj; | |
126 | }; | |
127 | ||
1da177e4 LT |
128 | struct efivar_attribute { |
129 | struct attribute attr; | |
130 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
131 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
132 | }; | |
133 | ||
5d9db883 MG |
134 | static struct efivars __efivars; |
135 | static struct efivar_operations ops; | |
136 | ||
7644c16c MW |
137 | #define PSTORE_EFI_ATTRIBUTES \ |
138 | (EFI_VARIABLE_NON_VOLATILE | \ | |
139 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
140 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 141 | |
1da177e4 LT |
142 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
143 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 144 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
145 | .show = _show, \ |
146 | .store = _store, \ | |
147 | }; | |
148 | ||
1da177e4 LT |
149 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
150 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
151 | ||
152 | /* | |
153 | * Prototype for sysfs creation function | |
154 | */ | |
155 | static int | |
4142ef14 MW |
156 | efivar_create_sysfs_entry(struct efivars *efivars, |
157 | unsigned long variable_name_size, | |
158 | efi_char16_t *variable_name, | |
159 | efi_guid_t *vendor_guid); | |
1da177e4 LT |
160 | |
161 | /* Return the number of unicode characters in data */ | |
162 | static unsigned long | |
a2940908 | 163 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
164 | { |
165 | unsigned long length = 0; | |
166 | ||
a2940908 | 167 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
168 | length++; |
169 | return length; | |
170 | } | |
171 | ||
b728a5c8 | 172 | static inline unsigned long |
a2940908 MW |
173 | utf16_strlen(efi_char16_t *s) |
174 | { | |
175 | return utf16_strnlen(s, ~0UL); | |
176 | } | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * Return the number of bytes is the length of this string | |
180 | * Note: this is NOT the same as the number of unicode characters | |
181 | */ | |
182 | static inline unsigned long | |
a2940908 | 183 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 184 | { |
a2940908 | 185 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
186 | } |
187 | ||
828aa1f0 MW |
188 | static inline int |
189 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
190 | { | |
191 | while (1) { | |
192 | if (len == 0) | |
193 | return 0; | |
194 | if (*a < *b) | |
195 | return -1; | |
196 | if (*a > *b) | |
197 | return 1; | |
198 | if (*a == 0) /* implies *b == 0 */ | |
199 | return 0; | |
200 | a++; | |
201 | b++; | |
202 | len--; | |
203 | } | |
204 | } | |
205 | ||
fec6c20b | 206 | static bool |
54b3a4d3 MG |
207 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
208 | unsigned long len) | |
fec6c20b MG |
209 | { |
210 | struct efi_generic_dev_path *node; | |
211 | int offset = 0; | |
212 | ||
213 | node = (struct efi_generic_dev_path *)buffer; | |
214 | ||
54b3a4d3 MG |
215 | if (len < sizeof(*node)) |
216 | return false; | |
fec6c20b | 217 | |
54b3a4d3 MG |
218 | while (offset <= len - sizeof(*node) && |
219 | node->length >= sizeof(*node) && | |
220 | node->length <= len - offset) { | |
221 | offset += node->length; | |
fec6c20b MG |
222 | |
223 | if ((node->type == EFI_DEV_END_PATH || | |
224 | node->type == EFI_DEV_END_PATH2) && | |
225 | node->sub_type == EFI_DEV_END_ENTIRE) | |
226 | return true; | |
227 | ||
228 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
229 | } | |
230 | ||
231 | /* | |
232 | * If we're here then either node->length pointed past the end | |
233 | * of the buffer or we reached the end of the buffer without | |
234 | * finding a device path end node. | |
235 | */ | |
236 | return false; | |
237 | } | |
238 | ||
239 | static bool | |
54b3a4d3 MG |
240 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
241 | unsigned long len) | |
fec6c20b MG |
242 | { |
243 | /* An array of 16-bit integers */ | |
244 | if ((len % 2) != 0) | |
245 | return false; | |
246 | ||
247 | return true; | |
248 | } | |
249 | ||
250 | static bool | |
54b3a4d3 MG |
251 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
252 | unsigned long len) | |
fec6c20b MG |
253 | { |
254 | u16 filepathlength; | |
54b3a4d3 MG |
255 | int i, desclength = 0, namelen; |
256 | ||
257 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
258 | |
259 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
260 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
261 | if (var->VariableName[i] > 127 || |
262 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
263 | return true; |
264 | } | |
265 | ||
54b3a4d3 MG |
266 | /* Reject it if there's 4 digits of hex and then further content */ |
267 | if (namelen > match + 4) | |
268 | return false; | |
269 | ||
270 | /* A valid entry must be at least 8 bytes */ | |
271 | if (len < 8) | |
fec6c20b MG |
272 | return false; |
273 | ||
274 | filepathlength = buffer[4] | buffer[5] << 8; | |
275 | ||
276 | /* | |
277 | * There's no stored length for the description, so it has to be | |
278 | * found by hand | |
279 | */ | |
54b3a4d3 | 280 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
281 | |
282 | /* Each boot entry must have a descriptor */ | |
283 | if (!desclength) | |
284 | return false; | |
285 | ||
286 | /* | |
287 | * If the sum of the length of the description, the claimed filepath | |
288 | * length and the original header are greater than the length of the | |
289 | * variable, it's malformed | |
290 | */ | |
291 | if ((desclength + filepathlength + 6) > len) | |
292 | return false; | |
293 | ||
294 | /* | |
295 | * And, finally, check the filepath | |
296 | */ | |
297 | return validate_device_path(var, match, buffer + desclength + 6, | |
298 | filepathlength); | |
299 | } | |
300 | ||
301 | static bool | |
54b3a4d3 MG |
302 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
303 | unsigned long len) | |
fec6c20b MG |
304 | { |
305 | /* A single 16-bit integer */ | |
306 | if (len != 2) | |
307 | return false; | |
308 | ||
309 | return true; | |
310 | } | |
311 | ||
312 | static bool | |
54b3a4d3 MG |
313 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
314 | unsigned long len) | |
fec6c20b MG |
315 | { |
316 | int i; | |
317 | ||
318 | for (i = 0; i < len; i++) { | |
319 | if (buffer[i] > 127) | |
320 | return false; | |
321 | ||
322 | if (buffer[i] == 0) | |
323 | return true; | |
324 | } | |
325 | ||
326 | return false; | |
327 | } | |
328 | ||
329 | struct variable_validate { | |
330 | char *name; | |
331 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 332 | unsigned long len); |
fec6c20b MG |
333 | }; |
334 | ||
335 | static const struct variable_validate variable_validate[] = { | |
336 | { "BootNext", validate_uint16 }, | |
337 | { "BootOrder", validate_boot_order }, | |
338 | { "DriverOrder", validate_boot_order }, | |
339 | { "Boot*", validate_load_option }, | |
340 | { "Driver*", validate_load_option }, | |
341 | { "ConIn", validate_device_path }, | |
342 | { "ConInDev", validate_device_path }, | |
343 | { "ConOut", validate_device_path }, | |
344 | { "ConOutDev", validate_device_path }, | |
345 | { "ErrOut", validate_device_path }, | |
346 | { "ErrOutDev", validate_device_path }, | |
347 | { "Timeout", validate_uint16 }, | |
348 | { "Lang", validate_ascii_string }, | |
349 | { "PlatformLang", validate_ascii_string }, | |
350 | { "", NULL }, | |
351 | }; | |
352 | ||
353 | static bool | |
54b3a4d3 | 354 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
355 | { |
356 | int i; | |
357 | u16 *unicode_name = var->VariableName; | |
358 | ||
359 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
360 | const char *name = variable_validate[i].name; | |
361 | int match; | |
362 | ||
363 | for (match = 0; ; match++) { | |
364 | char c = name[match]; | |
365 | u16 u = unicode_name[match]; | |
366 | ||
367 | /* All special variables are plain ascii */ | |
368 | if (u > 127) | |
369 | return true; | |
370 | ||
371 | /* Wildcard in the matching name means we've matched */ | |
372 | if (c == '*') | |
373 | return variable_validate[i].validate(var, | |
374 | match, data, len); | |
375 | ||
376 | /* Case sensitive match */ | |
377 | if (c != u) | |
378 | break; | |
379 | ||
380 | /* Reached the end of the string while matching */ | |
381 | if (!c) | |
382 | return variable_validate[i].validate(var, | |
383 | match, data, len); | |
384 | } | |
385 | } | |
386 | ||
387 | return true; | |
388 | } | |
389 | ||
1da177e4 | 390 | static efi_status_t |
5ee9c198 | 391 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
392 | { |
393 | efi_status_t status; | |
394 | ||
1da177e4 | 395 | var->DataSize = 1024; |
3295814d MW |
396 | status = efivars->ops->get_variable(var->VariableName, |
397 | &var->VendorGuid, | |
398 | &var->Attributes, | |
399 | &var->DataSize, | |
400 | var->Data); | |
5ee9c198 MG |
401 | return status; |
402 | } | |
403 | ||
404 | static efi_status_t | |
405 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
406 | { | |
407 | efi_status_t status; | |
408 | ||
409 | spin_lock(&efivars->lock); | |
410 | status = get_var_data_locked(efivars, var); | |
29422693 | 411 | spin_unlock(&efivars->lock); |
5ee9c198 | 412 | |
1da177e4 LT |
413 | if (status != EFI_SUCCESS) { |
414 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
415 | status); | |
416 | } | |
417 | return status; | |
418 | } | |
419 | ||
420 | static ssize_t | |
421 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
422 | { | |
423 | struct efi_variable *var = &entry->var; | |
424 | char *str = buf; | |
425 | ||
426 | if (!entry || !buf) | |
427 | return 0; | |
428 | ||
429 | efi_guid_unparse(&var->VendorGuid, str); | |
430 | str += strlen(str); | |
431 | str += sprintf(str, "\n"); | |
432 | ||
433 | return str - buf; | |
434 | } | |
435 | ||
436 | static ssize_t | |
437 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
438 | { | |
439 | struct efi_variable *var = &entry->var; | |
440 | char *str = buf; | |
441 | efi_status_t status; | |
442 | ||
443 | if (!entry || !buf) | |
444 | return -EINVAL; | |
445 | ||
4142ef14 | 446 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
447 | if (status != EFI_SUCCESS) |
448 | return -EIO; | |
449 | ||
70839090 | 450 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 451 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 452 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 453 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 454 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 455 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
456 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
457 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
458 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
459 | str += sprintf(str, | |
460 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
461 | if (var->Attributes & | |
462 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
463 | str += sprintf(str, | |
464 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
465 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
466 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
467 | return str - buf; |
468 | } | |
469 | ||
470 | static ssize_t | |
471 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
472 | { | |
473 | struct efi_variable *var = &entry->var; | |
474 | char *str = buf; | |
475 | efi_status_t status; | |
476 | ||
477 | if (!entry || !buf) | |
478 | return -EINVAL; | |
479 | ||
4142ef14 | 480 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
481 | if (status != EFI_SUCCESS) |
482 | return -EIO; | |
483 | ||
484 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
485 | return str - buf; | |
486 | } | |
487 | ||
488 | static ssize_t | |
489 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
490 | { | |
491 | struct efi_variable *var = &entry->var; | |
492 | efi_status_t status; | |
493 | ||
494 | if (!entry || !buf) | |
495 | return -EINVAL; | |
496 | ||
4142ef14 | 497 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
498 | if (status != EFI_SUCCESS) |
499 | return -EIO; | |
500 | ||
501 | memcpy(buf, var->Data, var->DataSize); | |
502 | return var->DataSize; | |
503 | } | |
504 | /* | |
505 | * We allow each variable to be edited via rewriting the | |
506 | * entire efi variable structure. | |
507 | */ | |
508 | static ssize_t | |
509 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
510 | { | |
511 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 512 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
513 | efi_status_t status = EFI_NOT_FOUND; |
514 | ||
515 | if (count != sizeof(struct efi_variable)) | |
516 | return -EINVAL; | |
517 | ||
518 | new_var = (struct efi_variable *)buf; | |
519 | /* | |
520 | * If only updating the variable data, then the name | |
521 | * and guid should remain the same | |
522 | */ | |
523 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
524 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
525 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
529 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
530 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
fec6c20b MG |
534 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
535 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
536 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
29422693 | 540 | spin_lock(&efivars->lock); |
3295814d MW |
541 | status = efivars->ops->set_variable(new_var->VariableName, |
542 | &new_var->VendorGuid, | |
543 | new_var->Attributes, | |
544 | new_var->DataSize, | |
545 | new_var->Data); | |
1da177e4 | 546 | |
29422693 | 547 | spin_unlock(&efivars->lock); |
1da177e4 LT |
548 | |
549 | if (status != EFI_SUCCESS) { | |
550 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
551 | status); | |
552 | return -EIO; | |
553 | } | |
554 | ||
555 | memcpy(&entry->var, new_var, count); | |
556 | return count; | |
557 | } | |
558 | ||
559 | static ssize_t | |
560 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
561 | { | |
562 | struct efi_variable *var = &entry->var; | |
563 | efi_status_t status; | |
564 | ||
565 | if (!entry || !buf) | |
566 | return 0; | |
567 | ||
4142ef14 | 568 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
569 | if (status != EFI_SUCCESS) |
570 | return -EIO; | |
571 | ||
572 | memcpy(buf, var, sizeof(*var)); | |
573 | return sizeof(*var); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 578 | * the attributes... |
1da177e4 LT |
579 | */ |
580 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
581 | char *buf) | |
582 | { | |
583 | struct efivar_entry *var = to_efivar_entry(kobj); | |
584 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 585 | ssize_t ret = -EIO; |
1da177e4 LT |
586 | |
587 | if (!capable(CAP_SYS_ADMIN)) | |
588 | return -EACCES; | |
589 | ||
590 | if (efivar_attr->show) { | |
591 | ret = efivar_attr->show(var, buf); | |
592 | } | |
593 | return ret; | |
594 | } | |
595 | ||
596 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
597 | const char *buf, size_t count) | |
598 | { | |
599 | struct efivar_entry *var = to_efivar_entry(kobj); | |
600 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 601 | ssize_t ret = -EIO; |
1da177e4 LT |
602 | |
603 | if (!capable(CAP_SYS_ADMIN)) | |
604 | return -EACCES; | |
605 | ||
606 | if (efivar_attr->store) | |
607 | ret = efivar_attr->store(var, buf, count); | |
608 | ||
609 | return ret; | |
610 | } | |
611 | ||
52cf25d0 | 612 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
613 | .show = efivar_attr_show, |
614 | .store = efivar_attr_store, | |
615 | }; | |
616 | ||
617 | static void efivar_release(struct kobject *kobj) | |
618 | { | |
619 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
620 | kfree(var); |
621 | } | |
622 | ||
623 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
624 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
625 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
626 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
627 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
628 | ||
629 | static struct attribute *def_attrs[] = { | |
630 | &efivar_attr_guid.attr, | |
631 | &efivar_attr_size.attr, | |
632 | &efivar_attr_attributes.attr, | |
633 | &efivar_attr_data.attr, | |
634 | &efivar_attr_raw_var.attr, | |
635 | NULL, | |
636 | }; | |
637 | ||
e89a4116 | 638 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
639 | .release = efivar_release, |
640 | .sysfs_ops = &efivar_attr_ops, | |
641 | .default_attrs = def_attrs, | |
642 | }; | |
643 | ||
1da177e4 LT |
644 | static inline void |
645 | efivar_unregister(struct efivar_entry *var) | |
646 | { | |
c10997f6 | 647 | kobject_put(&var->kobj); |
1da177e4 LT |
648 | } |
649 | ||
5d9db883 MG |
650 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
651 | { | |
652 | file->private_data = inode->i_private; | |
653 | return 0; | |
654 | } | |
655 | ||
7253eaba MF |
656 | static int efi_status_to_err(efi_status_t status) |
657 | { | |
658 | int err; | |
659 | ||
660 | switch (status) { | |
661 | case EFI_INVALID_PARAMETER: | |
662 | err = -EINVAL; | |
663 | break; | |
664 | case EFI_OUT_OF_RESOURCES: | |
665 | err = -ENOSPC; | |
666 | break; | |
667 | case EFI_DEVICE_ERROR: | |
668 | err = -EIO; | |
669 | break; | |
670 | case EFI_WRITE_PROTECTED: | |
671 | err = -EROFS; | |
672 | break; | |
673 | case EFI_SECURITY_VIOLATION: | |
674 | err = -EACCES; | |
675 | break; | |
676 | case EFI_NOT_FOUND: | |
1fa7e695 | 677 | err = -EIO; |
7253eaba MF |
678 | break; |
679 | default: | |
680 | err = -EINVAL; | |
681 | } | |
682 | ||
683 | return err; | |
684 | } | |
685 | ||
5d9db883 MG |
686 | static ssize_t efivarfs_file_write(struct file *file, |
687 | const char __user *userbuf, size_t count, loff_t *ppos) | |
688 | { | |
689 | struct efivar_entry *var = file->private_data; | |
690 | struct efivars *efivars; | |
691 | efi_status_t status; | |
692 | void *data; | |
693 | u32 attributes; | |
694 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 695 | unsigned long datasize = count - sizeof(attributes); |
0c542edd | 696 | unsigned long newdatasize; |
89d16665 | 697 | u64 storage_size, remaining_size, max_size; |
cfcf2f11 | 698 | ssize_t bytes = 0; |
5d9db883 MG |
699 | |
700 | if (count < sizeof(attributes)) | |
701 | return -EINVAL; | |
702 | ||
89d16665 MF |
703 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
704 | return -EFAULT; | |
5d9db883 | 705 | |
89d16665 MF |
706 | if (attributes & ~(EFI_VARIABLE_MASK)) |
707 | return -EINVAL; | |
5d9db883 MG |
708 | |
709 | efivars = var->efivars; | |
710 | ||
89d16665 MF |
711 | /* |
712 | * Ensure that the user can't allocate arbitrarily large | |
713 | * amounts of memory. Pick a default size of 64K if | |
714 | * QueryVariableInfo() isn't supported by the firmware. | |
715 | */ | |
716 | spin_lock(&efivars->lock); | |
717 | ||
718 | if (!efivars->ops->query_variable_info) | |
719 | status = EFI_UNSUPPORTED; | |
720 | else { | |
721 | const struct efivar_operations *fops = efivars->ops; | |
722 | status = fops->query_variable_info(attributes, &storage_size, | |
723 | &remaining_size, &max_size); | |
5d9db883 MG |
724 | } |
725 | ||
89d16665 MF |
726 | spin_unlock(&efivars->lock); |
727 | ||
728 | if (status != EFI_SUCCESS) { | |
729 | if (status != EFI_UNSUPPORTED) | |
730 | return efi_status_to_err(status); | |
731 | ||
732 | remaining_size = 65536; | |
5d9db883 MG |
733 | } |
734 | ||
89d16665 MF |
735 | if (datasize > remaining_size) |
736 | return -ENOSPC; | |
737 | ||
738 | data = kmalloc(datasize, GFP_KERNEL); | |
739 | if (!data) | |
740 | return -ENOMEM; | |
741 | ||
5d9db883 | 742 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 743 | bytes = -EFAULT; |
5d9db883 MG |
744 | goto out; |
745 | } | |
746 | ||
747 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 748 | bytes = -EINVAL; |
5d9db883 MG |
749 | goto out; |
750 | } | |
751 | ||
f5f6a60a JK |
752 | /* |
753 | * The lock here protects the get_variable call, the conditional | |
754 | * set_variable call, and removal of the variable from the efivars | |
755 | * list (in the case of an authenticated delete). | |
756 | */ | |
757 | spin_lock(&efivars->lock); | |
758 | ||
5d9db883 MG |
759 | status = efivars->ops->set_variable(var->var.VariableName, |
760 | &var->var.VendorGuid, | |
761 | attributes, datasize, | |
762 | data); | |
763 | ||
f5f6a60a JK |
764 | if (status != EFI_SUCCESS) { |
765 | spin_unlock(&efivars->lock); | |
766 | kfree(data); | |
767 | ||
7253eaba | 768 | return efi_status_to_err(status); |
5d9db883 | 769 | } |
0c542edd | 770 | |
cfcf2f11 MF |
771 | bytes = count; |
772 | ||
0c542edd JK |
773 | /* |
774 | * Writing to the variable may have caused a change in size (which | |
775 | * could either be an append or an overwrite), or the variable to be | |
776 | * deleted. Perform a GetVariable() so we can tell what actually | |
777 | * happened. | |
778 | */ | |
779 | newdatasize = 0; | |
780 | status = efivars->ops->get_variable(var->var.VariableName, | |
781 | &var->var.VendorGuid, | |
782 | NULL, &newdatasize, | |
783 | NULL); | |
784 | ||
785 | if (status == EFI_BUFFER_TOO_SMALL) { | |
f5f6a60a | 786 | spin_unlock(&efivars->lock); |
0c542edd JK |
787 | mutex_lock(&inode->i_mutex); |
788 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
789 | mutex_unlock(&inode->i_mutex); | |
790 | ||
791 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd JK |
792 | list_del(&var->list); |
793 | spin_unlock(&efivars->lock); | |
794 | efivar_unregister(var); | |
795 | drop_nlink(inode); | |
791eb564 | 796 | d_delete(file->f_dentry); |
0c542edd JK |
797 | dput(file->f_dentry); |
798 | ||
799 | } else { | |
f5f6a60a | 800 | spin_unlock(&efivars->lock); |
0c542edd JK |
801 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
802 | "status = %lx\n", status); | |
803 | } | |
804 | ||
5d9db883 MG |
805 | out: |
806 | kfree(data); | |
807 | ||
cfcf2f11 | 808 | return bytes; |
5d9db883 MG |
809 | } |
810 | ||
811 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
812 | size_t count, loff_t *ppos) | |
813 | { | |
814 | struct efivar_entry *var = file->private_data; | |
815 | struct efivars *efivars = var->efivars; | |
816 | efi_status_t status; | |
817 | unsigned long datasize = 0; | |
818 | u32 attributes; | |
819 | void *data; | |
d142df03 | 820 | ssize_t size = 0; |
5d9db883 | 821 | |
f5f6a60a | 822 | spin_lock(&efivars->lock); |
5d9db883 MG |
823 | status = efivars->ops->get_variable(var->var.VariableName, |
824 | &var->var.VendorGuid, | |
825 | &attributes, &datasize, NULL); | |
f5f6a60a | 826 | spin_unlock(&efivars->lock); |
5d9db883 MG |
827 | |
828 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 829 | return efi_status_to_err(status); |
5d9db883 | 830 | |
d2923841 | 831 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
832 | |
833 | if (!data) | |
7253eaba | 834 | return -ENOMEM; |
5d9db883 | 835 | |
f5f6a60a | 836 | spin_lock(&efivars->lock); |
5d9db883 MG |
837 | status = efivars->ops->get_variable(var->var.VariableName, |
838 | &var->var.VendorGuid, | |
839 | &attributes, &datasize, | |
d2923841 | 840 | (data + sizeof(attributes))); |
f5f6a60a JK |
841 | spin_unlock(&efivars->lock); |
842 | ||
7253eaba MF |
843 | if (status != EFI_SUCCESS) { |
844 | size = efi_status_to_err(status); | |
d142df03 | 845 | goto out_free; |
7253eaba | 846 | } |
5d9db883 | 847 | |
d2923841 | 848 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 849 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 850 | data, datasize + sizeof(attributes)); |
d142df03 | 851 | out_free: |
5d9db883 MG |
852 | kfree(data); |
853 | ||
854 | return size; | |
855 | } | |
856 | ||
857 | static void efivarfs_evict_inode(struct inode *inode) | |
858 | { | |
859 | clear_inode(inode); | |
860 | } | |
861 | ||
862 | static const struct super_operations efivarfs_ops = { | |
863 | .statfs = simple_statfs, | |
864 | .drop_inode = generic_delete_inode, | |
865 | .evict_inode = efivarfs_evict_inode, | |
866 | .show_options = generic_show_options, | |
867 | }; | |
868 | ||
869 | static struct super_block *efivarfs_sb; | |
870 | ||
871 | static const struct inode_operations efivarfs_dir_inode_operations; | |
872 | ||
873 | static const struct file_operations efivarfs_file_operations = { | |
874 | .open = efivarfs_file_open, | |
875 | .read = efivarfs_file_read, | |
876 | .write = efivarfs_file_write, | |
877 | .llseek = no_llseek, | |
878 | }; | |
879 | ||
880 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
881 | const struct inode *dir, int mode, dev_t dev) | |
882 | { | |
883 | struct inode *inode = new_inode(sb); | |
884 | ||
885 | if (inode) { | |
886 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
887 | inode->i_mode = mode; |
888 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
889 | switch (mode & S_IFMT) { | |
890 | case S_IFREG: | |
891 | inode->i_fop = &efivarfs_file_operations; | |
892 | break; | |
893 | case S_IFDIR: | |
894 | inode->i_op = &efivarfs_dir_inode_operations; | |
895 | inode->i_fop = &simple_dir_operations; | |
896 | inc_nlink(inode); | |
897 | break; | |
898 | } | |
899 | } | |
900 | return inode; | |
901 | } | |
902 | ||
903 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) | |
904 | { | |
905 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
906 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
907 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
908 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
909 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
910 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
911 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
912 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
913 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
914 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
915 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
916 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
917 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
918 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
919 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
920 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
921 | } | |
922 | ||
923 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
924 | umode_t mode, bool excl) | |
925 | { | |
45a937a8 | 926 | struct inode *inode; |
5d9db883 MG |
927 | struct efivars *efivars = &__efivars; |
928 | struct efivar_entry *var; | |
929 | int namelen, i = 0, err = 0; | |
930 | ||
310ad754 JK |
931 | /* |
932 | * We need a GUID, plus at least one letter for the variable name, | |
933 | * plus the '-' separator | |
934 | */ | |
935 | if (dentry->d_name.len < GUID_LEN + 2) | |
5d9db883 MG |
936 | return -EINVAL; |
937 | ||
45a937a8 | 938 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 939 | if (!inode) |
aeeaa8d4 | 940 | return -ENOMEM; |
5d9db883 MG |
941 | |
942 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
943 | if (!var) { |
944 | err = -ENOMEM; | |
945 | goto out; | |
946 | } | |
5d9db883 | 947 | |
310ad754 JK |
948 | /* length of the variable name itself: remove GUID and separator */ |
949 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
950 | |
951 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
952 | &var->var.VendorGuid); | |
953 | ||
954 | for (i = 0; i < namelen; i++) | |
955 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
956 | ||
957 | var->var.VariableName[i] = '\0'; | |
958 | ||
959 | inode->i_private = var; | |
960 | var->efivars = efivars; | |
961 | var->kobj.kset = efivars->kset; | |
962 | ||
963 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
964 | dentry->d_name.name); | |
965 | if (err) | |
966 | goto out; | |
967 | ||
968 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
969 | spin_lock(&efivars->lock); | |
970 | list_add(&var->list, &efivars->list); | |
971 | spin_unlock(&efivars->lock); | |
972 | d_instantiate(dentry, inode); | |
973 | dget(dentry); | |
974 | out: | |
45a937a8 | 975 | if (err) { |
5d9db883 | 976 | kfree(var); |
45a937a8 AW |
977 | iput(inode); |
978 | } | |
5d9db883 MG |
979 | return err; |
980 | } | |
981 | ||
982 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
983 | { | |
984 | struct efivar_entry *var = dentry->d_inode->i_private; | |
985 | struct efivars *efivars = var->efivars; | |
986 | efi_status_t status; | |
987 | ||
988 | spin_lock(&efivars->lock); | |
989 | ||
990 | status = efivars->ops->set_variable(var->var.VariableName, | |
991 | &var->var.VendorGuid, | |
992 | 0, 0, NULL); | |
993 | ||
994 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
995 | list_del(&var->list); | |
996 | spin_unlock(&efivars->lock); | |
997 | efivar_unregister(var); | |
de5fe955 | 998 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
999 | dput(dentry); |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | spin_unlock(&efivars->lock); | |
1004 | return -EINVAL; | |
1005 | }; | |
1006 | ||
e83af1f1 | 1007 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1008 | { |
1009 | struct inode *inode = NULL; | |
1010 | struct dentry *root; | |
1011 | struct efivar_entry *entry, *n; | |
1012 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1013 | char *name; |
5d9db883 MG |
1014 | |
1015 | efivarfs_sb = sb; | |
1016 | ||
1017 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1018 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1019 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1020 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 MG |
1021 | sb->s_op = &efivarfs_ops; |
1022 | sb->s_time_gran = 1; | |
1023 | ||
1024 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1025 | if (!inode) |
1026 | return -ENOMEM; | |
5d9db883 MG |
1027 | inode->i_op = &efivarfs_dir_inode_operations; |
1028 | ||
1029 | root = d_make_root(inode); | |
1030 | sb->s_root = root; | |
5c9b50ab AW |
1031 | if (!root) |
1032 | return -ENOMEM; | |
5d9db883 MG |
1033 | |
1034 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1035 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1036 | unsigned long size = 0; |
1037 | int len, i; | |
1038 | ||
5ba6e291 AW |
1039 | inode = NULL; |
1040 | ||
5d9db883 MG |
1041 | len = utf16_strlen(entry->var.VariableName); |
1042 | ||
310ad754 JK |
1043 | /* name, plus '-', plus GUID, plus NUL*/ |
1044 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1045 | if (!name) |
1046 | goto fail; | |
5d9db883 MG |
1047 | |
1048 | for (i = 0; i < len; i++) | |
1049 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1050 | ||
1051 | name[len] = '-'; | |
1052 | ||
1053 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1054 | ||
310ad754 | 1055 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1056 | |
1057 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1058 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1059 | if (!inode) |
1060 | goto fail_name; | |
1061 | ||
5d9db883 | 1062 | dentry = d_alloc_name(root, name); |
5ba6e291 AW |
1063 | if (!dentry) |
1064 | goto fail_inode; | |
1065 | ||
c0359db1 AW |
1066 | /* copied by the above to local storage in the dentry. */ |
1067 | kfree(name); | |
5d9db883 | 1068 | |
f5f6a60a | 1069 | spin_lock(&efivars->lock); |
5d9db883 MG |
1070 | efivars->ops->get_variable(entry->var.VariableName, |
1071 | &entry->var.VendorGuid, | |
1072 | &entry->var.Attributes, | |
1073 | &size, | |
1074 | NULL); | |
f5f6a60a | 1075 | spin_unlock(&efivars->lock); |
5d9db883 MG |
1076 | |
1077 | mutex_lock(&inode->i_mutex); | |
1078 | inode->i_private = entry; | |
94a193fb | 1079 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1080 | mutex_unlock(&inode->i_mutex); |
1081 | d_add(dentry, inode); | |
1082 | } | |
1083 | ||
1084 | return 0; | |
5ba6e291 AW |
1085 | |
1086 | fail_inode: | |
1087 | iput(inode); | |
1088 | fail_name: | |
1089 | kfree(name); | |
1090 | fail: | |
1091 | return -ENOMEM; | |
5d9db883 MG |
1092 | } |
1093 | ||
1094 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1095 | int flags, const char *dev_name, void *data) | |
1096 | { | |
1097 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1098 | } | |
1099 | ||
1100 | static void efivarfs_kill_sb(struct super_block *sb) | |
1101 | { | |
1102 | kill_litter_super(sb); | |
1103 | efivarfs_sb = NULL; | |
1104 | } | |
1105 | ||
1106 | static struct file_system_type efivarfs_type = { | |
1107 | .name = "efivarfs", | |
1108 | .mount = efivarfs_mount, | |
1109 | .kill_sb = efivarfs_kill_sb, | |
1110 | }; | |
1111 | ||
1112 | static const struct inode_operations efivarfs_dir_inode_operations = { | |
1113 | .lookup = simple_lookup, | |
1114 | .unlink = efivarfs_unlink, | |
1115 | .create = efivarfs_create, | |
1116 | }; | |
1117 | ||
1118 | static struct pstore_info efi_pstore_info; | |
1119 | ||
5ee9c198 MG |
1120 | #ifdef CONFIG_PSTORE |
1121 | ||
1122 | static int efi_pstore_open(struct pstore_info *psi) | |
1123 | { | |
1124 | struct efivars *efivars = psi->data; | |
1125 | ||
1126 | spin_lock(&efivars->lock); | |
1127 | efivars->walk_entry = list_first_entry(&efivars->list, | |
1128 | struct efivar_entry, list); | |
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static int efi_pstore_close(struct pstore_info *psi) | |
1133 | { | |
1134 | struct efivars *efivars = psi->data; | |
1135 | ||
1136 | spin_unlock(&efivars->lock); | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1141 | int *count, struct timespec *timespec, |
f6f82851 | 1142 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1143 | { |
1144 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1145 | struct efivars *efivars = psi->data; | |
1146 | char name[DUMP_NAME_LEN]; | |
1147 | int i; | |
755d4fe4 | 1148 | int cnt; |
5ee9c198 MG |
1149 | unsigned int part, size; |
1150 | unsigned long time; | |
1151 | ||
1152 | while (&efivars->walk_entry->list != &efivars->list) { | |
1153 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1154 | vendor)) { | |
1155 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1156 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1157 | } | |
755d4fe4 SA |
1158 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1159 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1160 | *id = part; |
755d4fe4 | 1161 | *count = cnt; |
5ee9c198 MG |
1162 | timespec->tv_sec = time; |
1163 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1164 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1165 | type, &part, &time) == 3) { | |
1166 | /* | |
1167 | * Check if an old format, | |
1168 | * which doesn't support holding | |
1169 | * multiple logs, remains. | |
1170 | */ | |
1171 | *id = part; | |
1172 | *count = 0; | |
1173 | timespec->tv_sec = time; | |
1174 | timespec->tv_nsec = 0; | |
1175 | } else { | |
1176 | efivars->walk_entry = list_entry( | |
1177 | efivars->walk_entry->list.next, | |
1178 | struct efivar_entry, list); | |
1179 | continue; | |
5ee9c198 | 1180 | } |
0f7de85a SA |
1181 | |
1182 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1183 | size = efivars->walk_entry->var.DataSize; | |
1184 | *buf = kmalloc(size, GFP_KERNEL); | |
1185 | if (*buf == NULL) | |
1186 | return -ENOMEM; | |
1187 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1188 | size); | |
1189 | efivars->walk_entry = list_entry( | |
1190 | efivars->walk_entry->list.next, | |
1191 | struct efivar_entry, list); | |
1192 | return size; | |
5ee9c198 MG |
1193 | } |
1194 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1195 | struct efivar_entry, list); | |
1196 | } | |
1197 | return 0; | |
1198 | } | |
1199 | ||
3d6d8d20 KC |
1200 | static int efi_pstore_write(enum pstore_type_id type, |
1201 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1202 | unsigned int part, int count, size_t size, |
1203 | struct pstore_info *psi) | |
5ee9c198 MG |
1204 | { |
1205 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1206 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1207 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1208 | struct efivars *efivars = psi->data; | |
b238b8fa | 1209 | int i, ret = 0; |
d80a361d SA |
1210 | u64 storage_space, remaining_space, max_variable_size; |
1211 | efi_status_t status = EFI_NOT_FOUND; | |
5ee9c198 | 1212 | |
5ee9c198 MG |
1213 | spin_lock(&efivars->lock); |
1214 | ||
d80a361d SA |
1215 | /* |
1216 | * Check if there is a space enough to log. | |
1217 | * size: a size of logging data | |
1218 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1219 | */ | |
1220 | status = efivars->ops->query_variable_info(PSTORE_EFI_ATTRIBUTES, | |
1221 | &storage_space, | |
1222 | &remaining_space, | |
1223 | &max_variable_size); | |
1224 | if (status || remaining_space < size + DUMP_NAME_LEN * 2) { | |
1225 | spin_unlock(&efivars->lock); | |
1226 | *id = part; | |
1227 | return -ENOSPC; | |
1228 | } | |
1229 | ||
755d4fe4 | 1230 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1231 | get_seconds()); |
5ee9c198 MG |
1232 | |
1233 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1234 | efi_name[i] = name[i]; | |
1235 | ||
7644c16c | 1236 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1237 | size, psi->buf); |
1238 | ||
1239 | spin_unlock(&efivars->lock); | |
1240 | ||
5ee9c198 | 1241 | if (size) |
b238b8fa | 1242 | ret = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1243 | utf16_strsize(efi_name, |
1244 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
1245 | efi_name, &vendor); |
1246 | ||
b238b8fa CG |
1247 | *id = part; |
1248 | return ret; | |
5ee9c198 MG |
1249 | }; |
1250 | ||
755d4fe4 | 1251 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1252 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1253 | { |
a9efd39c | 1254 | char name[DUMP_NAME_LEN]; |
dd230fec | 1255 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1256 | char name_old[DUMP_NAME_LEN]; |
1257 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1258 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1259 | struct efivars *efivars = psi->data; | |
1260 | struct efivar_entry *entry, *found = NULL; | |
1261 | int i; | |
1262 | ||
755d4fe4 | 1263 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1264 | time.tv_sec); |
dd230fec SA |
1265 | |
1266 | spin_lock(&efivars->lock); | |
1267 | ||
1268 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1269 | efi_name[i] = name[i]; |
dd230fec SA |
1270 | |
1271 | /* | |
a9efd39c | 1272 | * Clean up an entry with the same name |
dd230fec SA |
1273 | */ |
1274 | ||
1275 | list_for_each_entry(entry, &efivars->list, list) { | |
1276 | get_var_data_locked(efivars, &entry->var); | |
1277 | ||
1278 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1279 | continue; | |
1280 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1281 | utf16_strlen(efi_name))) { |
1282 | /* | |
1283 | * Check if an old format, | |
1284 | * which doesn't support holding | |
1285 | * multiple logs, remains. | |
1286 | */ | |
1287 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1288 | (unsigned int)id, time.tv_sec); | |
1289 | ||
1290 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1291 | efi_name_old[i] = name_old[i]; | |
1292 | ||
1293 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1294 | utf16_strlen(efi_name_old))) | |
1295 | continue; | |
1296 | } | |
dd230fec SA |
1297 | |
1298 | /* found */ | |
1299 | found = entry; | |
1300 | efivars->ops->set_variable(entry->var.VariableName, | |
1301 | &entry->var.VendorGuid, | |
1302 | PSTORE_EFI_ATTRIBUTES, | |
1303 | 0, NULL); | |
a9efd39c | 1304 | break; |
dd230fec SA |
1305 | } |
1306 | ||
1307 | if (found) | |
1308 | list_del(&found->list); | |
1309 | ||
1310 | spin_unlock(&efivars->lock); | |
1311 | ||
1312 | if (found) | |
1313 | efivar_unregister(found); | |
5ee9c198 MG |
1314 | |
1315 | return 0; | |
1316 | } | |
1317 | #else | |
1318 | static int efi_pstore_open(struct pstore_info *psi) | |
1319 | { | |
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | static int efi_pstore_close(struct pstore_info *psi) | |
1324 | { | |
1325 | return 0; | |
1326 | } | |
1327 | ||
755d4fe4 | 1328 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, int *count, |
eee628da CF |
1329 | struct timespec *timespec, |
1330 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1331 | { |
1332 | return -1; | |
1333 | } | |
1334 | ||
3d6d8d20 KC |
1335 | static int efi_pstore_write(enum pstore_type_id type, |
1336 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1337 | unsigned int part, int count, size_t size, |
1338 | struct pstore_info *psi) | |
5ee9c198 MG |
1339 | { |
1340 | return 0; | |
1341 | } | |
1342 | ||
755d4fe4 | 1343 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1344 | struct timespec time, struct pstore_info *psi) |
5ee9c198 MG |
1345 | { |
1346 | return 0; | |
1347 | } | |
1348 | #endif | |
1349 | ||
1350 | static struct pstore_info efi_pstore_info = { | |
1351 | .owner = THIS_MODULE, | |
1352 | .name = "efi", | |
1353 | .open = efi_pstore_open, | |
1354 | .close = efi_pstore_close, | |
1355 | .read = efi_pstore_read, | |
1356 | .write = efi_pstore_write, | |
1357 | .erase = efi_pstore_erase, | |
1358 | }; | |
1da177e4 | 1359 | |
2c3c8bea | 1360 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1361 | struct bin_attribute *bin_attr, |
1362 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1363 | { |
1364 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1365 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1366 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1367 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1368 | efi_status_t status = EFI_NOT_FOUND; |
1369 | int found = 0; | |
1370 | ||
1371 | if (!capable(CAP_SYS_ADMIN)) | |
1372 | return -EACCES; | |
1373 | ||
fec6c20b MG |
1374 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1375 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1376 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1377 | return -EINVAL; | |
1378 | } | |
1379 | ||
29422693 | 1380 | spin_lock(&efivars->lock); |
1da177e4 LT |
1381 | |
1382 | /* | |
1383 | * Does this variable already exist? | |
1384 | */ | |
29422693 | 1385 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1386 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1387 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1388 | if (strsize1 == strsize2 && |
1389 | !memcmp(&(search_efivar->var.VariableName), | |
1390 | new_var->VariableName, strsize1) && | |
1391 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1392 | new_var->VendorGuid)) { | |
1393 | found = 1; | |
1394 | break; | |
1395 | } | |
1396 | } | |
1397 | if (found) { | |
29422693 | 1398 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1399 | return -EINVAL; |
1400 | } | |
1401 | ||
1402 | /* now *really* create the variable via EFI */ | |
3295814d MW |
1403 | status = efivars->ops->set_variable(new_var->VariableName, |
1404 | &new_var->VendorGuid, | |
1405 | new_var->Attributes, | |
1406 | new_var->DataSize, | |
1407 | new_var->Data); | |
1da177e4 LT |
1408 | |
1409 | if (status != EFI_SUCCESS) { | |
1410 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1411 | status); | |
29422693 | 1412 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1413 | return -EIO; |
1414 | } | |
29422693 | 1415 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1416 | |
1417 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1418 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1419 | utf16_strsize(new_var->VariableName, |
1420 | 1024), | |
4142ef14 MW |
1421 | new_var->VariableName, |
1422 | &new_var->VendorGuid); | |
1da177e4 LT |
1423 | if (status) { |
1424 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1425 | } | |
1426 | return count; | |
1427 | } | |
1428 | ||
2c3c8bea | 1429 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1430 | struct bin_attribute *bin_attr, |
1431 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1432 | { |
1433 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1434 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1435 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1436 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1437 | efi_status_t status = EFI_NOT_FOUND; |
1438 | int found = 0; | |
1439 | ||
1440 | if (!capable(CAP_SYS_ADMIN)) | |
1441 | return -EACCES; | |
1442 | ||
29422693 | 1443 | spin_lock(&efivars->lock); |
1da177e4 LT |
1444 | |
1445 | /* | |
1446 | * Does this variable already exist? | |
1447 | */ | |
29422693 | 1448 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1449 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1450 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1451 | if (strsize1 == strsize2 && |
1452 | !memcmp(&(search_efivar->var.VariableName), | |
1453 | del_var->VariableName, strsize1) && | |
1454 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1455 | del_var->VendorGuid)) { | |
1456 | found = 1; | |
1457 | break; | |
1458 | } | |
1459 | } | |
1460 | if (!found) { | |
29422693 | 1461 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1462 | return -EINVAL; |
1463 | } | |
1464 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1465 | del_var->Attributes = 0; | |
1466 | del_var->DataSize = 0; | |
1467 | ||
3295814d MW |
1468 | status = efivars->ops->set_variable(del_var->VariableName, |
1469 | &del_var->VendorGuid, | |
1470 | del_var->Attributes, | |
1471 | del_var->DataSize, | |
1472 | del_var->Data); | |
1da177e4 LT |
1473 | |
1474 | if (status != EFI_SUCCESS) { | |
1475 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1476 | status); | |
29422693 | 1477 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1478 | return -EIO; |
1479 | } | |
496a0fc8 | 1480 | list_del(&search_efivar->list); |
1da177e4 | 1481 | /* We need to release this lock before unregistering. */ |
29422693 | 1482 | spin_unlock(&efivars->lock); |
1da177e4 LT |
1483 | efivar_unregister(search_efivar); |
1484 | ||
1485 | /* It's dead Jim.... */ | |
1486 | return count; | |
1487 | } | |
1488 | ||
1da177e4 LT |
1489 | /* |
1490 | * Let's not leave out systab information that snuck into | |
1491 | * the efivars driver | |
1492 | */ | |
334c6307 GKH |
1493 | static ssize_t systab_show(struct kobject *kobj, |
1494 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1495 | { |
1496 | char *str = buf; | |
1497 | ||
334c6307 | 1498 | if (!kobj || !buf) |
1da177e4 LT |
1499 | return -EINVAL; |
1500 | ||
b2c99e3c BH |
1501 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1502 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1503 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1504 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1505 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1506 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1507 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1508 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1509 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1510 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1511 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1512 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1513 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1514 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1515 | |
1516 | return str - buf; | |
1517 | } | |
1518 | ||
334c6307 GKH |
1519 | static struct kobj_attribute efi_attr_systab = |
1520 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1521 | |
334c6307 GKH |
1522 | static struct attribute *efi_subsys_attrs[] = { |
1523 | &efi_attr_systab.attr, | |
1da177e4 LT |
1524 | NULL, /* maybe more in the future? */ |
1525 | }; | |
1526 | ||
334c6307 GKH |
1527 | static struct attribute_group efi_subsys_attr_group = { |
1528 | .attrs = efi_subsys_attrs, | |
1529 | }; | |
1530 | ||
bc87d2fe | 1531 | static struct kobject *efi_kobj; |
1da177e4 LT |
1532 | |
1533 | /* | |
1534 | * efivar_create_sysfs_entry() | |
1535 | * Requires: | |
1536 | * variable_name_size = number of bytes required to hold | |
1537 | * variable_name (not counting the NULL | |
1538 | * character at the end. | |
29422693 | 1539 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1540 | * Returns 1 on failure, 0 on success |
1541 | */ | |
1542 | static int | |
4142ef14 MW |
1543 | efivar_create_sysfs_entry(struct efivars *efivars, |
1544 | unsigned long variable_name_size, | |
1545 | efi_char16_t *variable_name, | |
1546 | efi_guid_t *vendor_guid) | |
1da177e4 | 1547 | { |
310ad754 | 1548 | int i, short_name_size; |
1da177e4 LT |
1549 | char *short_name; |
1550 | struct efivar_entry *new_efivar; | |
1551 | ||
310ad754 JK |
1552 | /* |
1553 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1554 | * plus the GUID, plus trailing NUL | |
1555 | */ | |
1556 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1557 | + 1 + GUID_LEN + 1; | |
1558 | ||
1559 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1560 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1561 | |
1562 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1563 | kfree(short_name); |
1564 | kfree(new_efivar); | |
1da177e4 LT |
1565 | return 1; |
1566 | } | |
1da177e4 | 1567 | |
4142ef14 | 1568 | new_efivar->efivars = efivars; |
1da177e4 LT |
1569 | memcpy(new_efivar->var.VariableName, variable_name, |
1570 | variable_name_size); | |
1571 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1572 | ||
1573 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1574 | ala UTF-8 */ | |
1575 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1576 | short_name[i] = variable_name[i] & 0xFF; | |
1577 | } | |
1578 | /* This is ugly, but necessary to separate one vendor's | |
1579 | private variables from another's. */ | |
1580 | ||
1581 | *(short_name + strlen(short_name)) = '-'; | |
1582 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1583 | ||
29422693 | 1584 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1585 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1586 | "%s", short_name); | |
69b2186c JG |
1587 | if (i) { |
1588 | kfree(short_name); | |
1589 | kfree(new_efivar); | |
1590 | return 1; | |
1591 | } | |
1da177e4 | 1592 | |
d6d292c4 | 1593 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1594 | kfree(short_name); |
1595 | short_name = NULL; | |
1da177e4 | 1596 | |
29422693 MW |
1597 | spin_lock(&efivars->lock); |
1598 | list_add(&new_efivar->list, &efivars->list); | |
1599 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
1600 | |
1601 | return 0; | |
1602 | } | |
d502fbb0 MW |
1603 | |
1604 | static int | |
1605 | create_efivars_bin_attributes(struct efivars *efivars) | |
1606 | { | |
1607 | struct bin_attribute *attr; | |
1608 | int error; | |
1609 | ||
1610 | /* new_var */ | |
1611 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1612 | if (!attr) | |
1613 | return -ENOMEM; | |
1614 | ||
1615 | attr->attr.name = "new_var"; | |
1616 | attr->attr.mode = 0200; | |
1617 | attr->write = efivar_create; | |
1618 | attr->private = efivars; | |
1619 | efivars->new_var = attr; | |
1620 | ||
1621 | /* del_var */ | |
1622 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1623 | if (!attr) { | |
1624 | error = -ENOMEM; | |
1625 | goto out_free; | |
1626 | } | |
1627 | attr->attr.name = "del_var"; | |
1628 | attr->attr.mode = 0200; | |
1629 | attr->write = efivar_delete; | |
1630 | attr->private = efivars; | |
1631 | efivars->del_var = attr; | |
1632 | ||
1633 | sysfs_bin_attr_init(efivars->new_var); | |
1634 | sysfs_bin_attr_init(efivars->del_var); | |
1635 | ||
1636 | /* Register */ | |
1637 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1638 | efivars->new_var); | |
1639 | if (error) { | |
1640 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1641 | " due to error %d\n", error); | |
1642 | goto out_free; | |
1643 | } | |
1644 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1645 | efivars->del_var); | |
1646 | if (error) { | |
1647 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1648 | " due to error %d\n", error); | |
1649 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1650 | efivars->new_var); | |
1651 | goto out_free; | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | out_free: | |
051d51bc DC |
1656 | kfree(efivars->del_var); |
1657 | efivars->del_var = NULL; | |
d502fbb0 MW |
1658 | kfree(efivars->new_var); |
1659 | efivars->new_var = NULL; | |
1660 | return error; | |
1661 | } | |
1662 | ||
4fc756bd | 1663 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1664 | { |
1665 | struct efivar_entry *entry, *n; | |
4142ef14 | 1666 | |
76b53f7c MW |
1667 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
1668 | spin_lock(&efivars->lock); | |
1669 | list_del(&entry->list); | |
1670 | spin_unlock(&efivars->lock); | |
1671 | efivar_unregister(entry); | |
1672 | } | |
1673 | if (efivars->new_var) | |
1674 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1675 | if (efivars->del_var) | |
1676 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1677 | kfree(efivars->new_var); | |
1678 | kfree(efivars->del_var); | |
605e70c7 | 1679 | kobject_put(efivars->kobject); |
76b53f7c MW |
1680 | kset_unregister(efivars->kset); |
1681 | } | |
4fc756bd | 1682 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1683 | |
4fc756bd MW |
1684 | int register_efivars(struct efivars *efivars, |
1685 | const struct efivar_operations *ops, | |
1686 | struct kobject *parent_kobj) | |
1da177e4 LT |
1687 | { |
1688 | efi_status_t status = EFI_NOT_FOUND; | |
1689 | efi_guid_t vendor_guid; | |
1690 | efi_char16_t *variable_name; | |
1da177e4 | 1691 | unsigned long variable_name_size = 1024; |
334c6307 | 1692 | int error = 0; |
1da177e4 | 1693 | |
9c215384 | 1694 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1695 | if (!variable_name) { |
1696 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1697 | return -ENOMEM; | |
1698 | } | |
1699 | ||
29422693 MW |
1700 | spin_lock_init(&efivars->lock); |
1701 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1702 | efivars->ops = ops; |
29422693 | 1703 | |
76b53f7c | 1704 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1705 | if (!efivars->kset) { |
66ac831e GKH |
1706 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1707 | error = -ENOMEM; | |
76b53f7c | 1708 | goto out; |
1da177e4 LT |
1709 | } |
1710 | ||
605e70c7 LCY |
1711 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
1712 | if (!efivars->kobject) { | |
1713 | pr_err("efivars: Subsystem registration failed.\n"); | |
1714 | error = -ENOMEM; | |
1715 | kset_unregister(efivars->kset); | |
1716 | goto out; | |
1717 | } | |
1718 | ||
1da177e4 LT |
1719 | /* |
1720 | * Per EFI spec, the maximum storage allocated for both | |
1721 | * the variable name and variable data is 1024 bytes. | |
1722 | */ | |
1723 | ||
1724 | do { | |
1725 | variable_name_size = 1024; | |
1726 | ||
3295814d | 1727 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
1728 | variable_name, |
1729 | &vendor_guid); | |
1730 | switch (status) { | |
1731 | case EFI_SUCCESS: | |
4142ef14 MW |
1732 | efivar_create_sysfs_entry(efivars, |
1733 | variable_name_size, | |
1734 | variable_name, | |
1735 | &vendor_guid); | |
1da177e4 LT |
1736 | break; |
1737 | case EFI_NOT_FOUND: | |
1738 | break; | |
1739 | default: | |
1740 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
1741 | status); | |
1742 | status = EFI_NOT_FOUND; | |
1743 | break; | |
1744 | } | |
1745 | } while (status != EFI_NOT_FOUND); | |
1746 | ||
d502fbb0 | 1747 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 1748 | if (error) |
76b53f7c | 1749 | unregister_efivars(efivars); |
1da177e4 | 1750 | |
5ee9c198 MG |
1751 | efivars->efi_pstore_info = efi_pstore_info; |
1752 | ||
1753 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1754 | if (efivars->efi_pstore_info.buf) { | |
1755 | efivars->efi_pstore_info.bufsize = 1024; | |
1756 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 1757 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
1758 | pstore_register(&efivars->efi_pstore_info); |
1759 | } | |
1760 | ||
5d9db883 MG |
1761 | register_filesystem(&efivarfs_type); |
1762 | ||
76b53f7c MW |
1763 | out: |
1764 | kfree(variable_name); | |
1da177e4 | 1765 | |
76b53f7c MW |
1766 | return error; |
1767 | } | |
4fc756bd | 1768 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 1769 | |
76b53f7c MW |
1770 | /* |
1771 | * For now we register the efi subsystem with the firmware subsystem | |
1772 | * and the vars subsystem with the efi subsystem. In the future, it | |
1773 | * might make sense to split off the efi subsystem into its own | |
1774 | * driver, but for now only efivars will register with it, so just | |
1775 | * include it here. | |
1776 | */ | |
1777 | ||
1778 | static int __init | |
1779 | efivars_init(void) | |
1780 | { | |
1781 | int error = 0; | |
1782 | ||
1783 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1784 | EFIVARS_DATE); | |
1785 | ||
83e68189 | 1786 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 1787 | return 0; |
76b53f7c MW |
1788 | |
1789 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1790 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1791 | if (!efi_kobj) { | |
1792 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1793 | return -ENOMEM; | |
1794 | } | |
1795 | ||
3295814d MW |
1796 | ops.get_variable = efi.get_variable; |
1797 | ops.set_variable = efi.set_variable; | |
1798 | ops.get_next_variable = efi.get_next_variable; | |
d80a361d | 1799 | ops.query_variable_info = efi.query_variable_info; |
89d16665 | 1800 | |
3295814d | 1801 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
1802 | if (error) |
1803 | goto err_put; | |
76b53f7c MW |
1804 | |
1805 | /* Don't forget the systab entry */ | |
1806 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1807 | if (error) { | |
1808 | printk(KERN_ERR | |
1809 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1810 | error); | |
3116aabc | 1811 | goto err_unregister; |
76b53f7c | 1812 | } |
1da177e4 | 1813 | |
3116aabc DC |
1814 | return 0; |
1815 | ||
1816 | err_unregister: | |
1817 | unregister_efivars(&__efivars); | |
1818 | err_put: | |
1819 | kobject_put(efi_kobj); | |
1da177e4 LT |
1820 | return error; |
1821 | } | |
1822 | ||
1823 | static void __exit | |
1824 | efivars_exit(void) | |
1825 | { | |
83e68189 | 1826 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
1827 | unregister_efivars(&__efivars); |
1828 | kobject_put(efi_kobj); | |
1829 | } | |
1da177e4 LT |
1830 | } |
1831 | ||
1832 | module_init(efivars_init); | |
1833 | module_exit(efivars_exit); | |
1834 |