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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 | ||
1da177e4 | 194 | static efi_status_t |
5ee9c198 | 195 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
196 | { |
197 | efi_status_t status; | |
198 | ||
1da177e4 | 199 | var->DataSize = 1024; |
3295814d MW |
200 | status = efivars->ops->get_variable(var->VariableName, |
201 | &var->VendorGuid, | |
202 | &var->Attributes, | |
203 | &var->DataSize, | |
204 | var->Data); | |
5ee9c198 MG |
205 | return status; |
206 | } | |
207 | ||
208 | static efi_status_t | |
209 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
210 | { | |
211 | efi_status_t status; | |
212 | ||
213 | spin_lock(&efivars->lock); | |
214 | status = get_var_data_locked(efivars, var); | |
29422693 | 215 | spin_unlock(&efivars->lock); |
5ee9c198 | 216 | |
1da177e4 LT |
217 | if (status != EFI_SUCCESS) { |
218 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
219 | status); | |
220 | } | |
221 | return status; | |
222 | } | |
223 | ||
224 | static ssize_t | |
225 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
226 | { | |
227 | struct efi_variable *var = &entry->var; | |
228 | char *str = buf; | |
229 | ||
230 | if (!entry || !buf) | |
231 | return 0; | |
232 | ||
233 | efi_guid_unparse(&var->VendorGuid, str); | |
234 | str += strlen(str); | |
235 | str += sprintf(str, "\n"); | |
236 | ||
237 | return str - buf; | |
238 | } | |
239 | ||
240 | static ssize_t | |
241 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
242 | { | |
243 | struct efi_variable *var = &entry->var; | |
244 | char *str = buf; | |
245 | efi_status_t status; | |
246 | ||
247 | if (!entry || !buf) | |
248 | return -EINVAL; | |
249 | ||
4142ef14 | 250 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
251 | if (status != EFI_SUCCESS) |
252 | return -EIO; | |
253 | ||
254 | if (var->Attributes & 0x1) | |
255 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); | |
256 | if (var->Attributes & 0x2) | |
257 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); | |
258 | if (var->Attributes & 0x4) | |
259 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); | |
260 | return str - buf; | |
261 | } | |
262 | ||
263 | static ssize_t | |
264 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
265 | { | |
266 | struct efi_variable *var = &entry->var; | |
267 | char *str = buf; | |
268 | efi_status_t status; | |
269 | ||
270 | if (!entry || !buf) | |
271 | return -EINVAL; | |
272 | ||
4142ef14 | 273 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
274 | if (status != EFI_SUCCESS) |
275 | return -EIO; | |
276 | ||
277 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
278 | return str - buf; | |
279 | } | |
280 | ||
281 | static ssize_t | |
282 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
283 | { | |
284 | struct efi_variable *var = &entry->var; | |
285 | efi_status_t status; | |
286 | ||
287 | if (!entry || !buf) | |
288 | return -EINVAL; | |
289 | ||
4142ef14 | 290 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
291 | if (status != EFI_SUCCESS) |
292 | return -EIO; | |
293 | ||
294 | memcpy(buf, var->Data, var->DataSize); | |
295 | return var->DataSize; | |
296 | } | |
297 | /* | |
298 | * We allow each variable to be edited via rewriting the | |
299 | * entire efi variable structure. | |
300 | */ | |
301 | static ssize_t | |
302 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
303 | { | |
304 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 305 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
306 | efi_status_t status = EFI_NOT_FOUND; |
307 | ||
308 | if (count != sizeof(struct efi_variable)) | |
309 | return -EINVAL; | |
310 | ||
311 | new_var = (struct efi_variable *)buf; | |
312 | /* | |
313 | * If only updating the variable data, then the name | |
314 | * and guid should remain the same | |
315 | */ | |
316 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
317 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
318 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
323 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
29422693 | 327 | spin_lock(&efivars->lock); |
3295814d MW |
328 | status = efivars->ops->set_variable(new_var->VariableName, |
329 | &new_var->VendorGuid, | |
330 | new_var->Attributes, | |
331 | new_var->DataSize, | |
332 | new_var->Data); | |
1da177e4 | 333 | |
29422693 | 334 | spin_unlock(&efivars->lock); |
1da177e4 LT |
335 | |
336 | if (status != EFI_SUCCESS) { | |
337 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
338 | status); | |
339 | return -EIO; | |
340 | } | |
341 | ||
342 | memcpy(&entry->var, new_var, count); | |
343 | return count; | |
344 | } | |
345 | ||
346 | static ssize_t | |
347 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
348 | { | |
349 | struct efi_variable *var = &entry->var; | |
350 | efi_status_t status; | |
351 | ||
352 | if (!entry || !buf) | |
353 | return 0; | |
354 | ||
4142ef14 | 355 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
356 | if (status != EFI_SUCCESS) |
357 | return -EIO; | |
358 | ||
359 | memcpy(buf, var, sizeof(*var)); | |
360 | return sizeof(*var); | |
361 | } | |
362 | ||
363 | /* | |
364 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 365 | * the attributes... |
1da177e4 LT |
366 | */ |
367 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
368 | char *buf) | |
369 | { | |
370 | struct efivar_entry *var = to_efivar_entry(kobj); | |
371 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 372 | ssize_t ret = -EIO; |
1da177e4 LT |
373 | |
374 | if (!capable(CAP_SYS_ADMIN)) | |
375 | return -EACCES; | |
376 | ||
377 | if (efivar_attr->show) { | |
378 | ret = efivar_attr->show(var, buf); | |
379 | } | |
380 | return ret; | |
381 | } | |
382 | ||
383 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
384 | const char *buf, size_t count) | |
385 | { | |
386 | struct efivar_entry *var = to_efivar_entry(kobj); | |
387 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 388 | ssize_t ret = -EIO; |
1da177e4 LT |
389 | |
390 | if (!capable(CAP_SYS_ADMIN)) | |
391 | return -EACCES; | |
392 | ||
393 | if (efivar_attr->store) | |
394 | ret = efivar_attr->store(var, buf, count); | |
395 | ||
396 | return ret; | |
397 | } | |
398 | ||
52cf25d0 | 399 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
400 | .show = efivar_attr_show, |
401 | .store = efivar_attr_store, | |
402 | }; | |
403 | ||
404 | static void efivar_release(struct kobject *kobj) | |
405 | { | |
406 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
407 | kfree(var); |
408 | } | |
409 | ||
410 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
411 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
412 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
413 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
414 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
415 | ||
416 | static struct attribute *def_attrs[] = { | |
417 | &efivar_attr_guid.attr, | |
418 | &efivar_attr_size.attr, | |
419 | &efivar_attr_attributes.attr, | |
420 | &efivar_attr_data.attr, | |
421 | &efivar_attr_raw_var.attr, | |
422 | NULL, | |
423 | }; | |
424 | ||
e89a4116 | 425 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
426 | .release = efivar_release, |
427 | .sysfs_ops = &efivar_attr_ops, | |
428 | .default_attrs = def_attrs, | |
429 | }; | |
430 | ||
5ee9c198 MG |
431 | static struct pstore_info efi_pstore_info; |
432 | ||
1da177e4 LT |
433 | static inline void |
434 | efivar_unregister(struct efivar_entry *var) | |
435 | { | |
c10997f6 | 436 | kobject_put(&var->kobj); |
1da177e4 LT |
437 | } |
438 | ||
5ee9c198 MG |
439 | #ifdef CONFIG_PSTORE |
440 | ||
441 | static int efi_pstore_open(struct pstore_info *psi) | |
442 | { | |
443 | struct efivars *efivars = psi->data; | |
444 | ||
445 | spin_lock(&efivars->lock); | |
446 | efivars->walk_entry = list_first_entry(&efivars->list, | |
447 | struct efivar_entry, list); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | static int efi_pstore_close(struct pstore_info *psi) | |
452 | { | |
453 | struct efivars *efivars = psi->data; | |
454 | ||
455 | spin_unlock(&efivars->lock); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
460 | struct timespec *timespec, struct pstore_info *psi) | |
461 | { | |
462 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
463 | struct efivars *efivars = psi->data; | |
464 | char name[DUMP_NAME_LEN]; | |
465 | int i; | |
466 | unsigned int part, size; | |
467 | unsigned long time; | |
468 | ||
469 | while (&efivars->walk_entry->list != &efivars->list) { | |
470 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
471 | vendor)) { | |
472 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
473 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
474 | } | |
475 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { | |
476 | *id = part; | |
477 | timespec->tv_sec = time; | |
478 | timespec->tv_nsec = 0; | |
479 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
480 | size = efivars->walk_entry->var.DataSize; | |
481 | memcpy(psi->buf, efivars->walk_entry->var.Data, size); | |
482 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
483 | struct efivar_entry, list); | |
484 | return size; | |
485 | } | |
486 | } | |
487 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
488 | struct efivar_entry, list); | |
489 | } | |
490 | return 0; | |
491 | } | |
492 | ||
493 | static u64 efi_pstore_write(enum pstore_type_id type, unsigned int part, | |
494 | size_t size, struct pstore_info *psi) | |
495 | { | |
496 | char name[DUMP_NAME_LEN]; | |
497 | char stub_name[DUMP_NAME_LEN]; | |
498 | efi_char16_t efi_name[DUMP_NAME_LEN]; | |
499 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
500 | struct efivars *efivars = psi->data; | |
501 | struct efivar_entry *entry, *found = NULL; | |
502 | int i; | |
503 | ||
504 | sprintf(stub_name, "dump-type%u-%u-", type, part); | |
505 | sprintf(name, "%s%lu", stub_name, get_seconds()); | |
506 | ||
507 | spin_lock(&efivars->lock); | |
508 | ||
509 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
510 | efi_name[i] = stub_name[i]; | |
511 | ||
512 | /* | |
513 | * Clean up any entries with the same name | |
514 | */ | |
515 | ||
516 | list_for_each_entry(entry, &efivars->list, list) { | |
517 | get_var_data_locked(efivars, &entry->var); | |
518 | ||
c475594d MW |
519 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
520 | continue; | |
521 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
522 | utf16_strlen(efi_name))) | |
523 | continue; | |
524 | /* Needs to be a prefix */ | |
525 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) | |
526 | continue; | |
527 | ||
528 | /* found */ | |
529 | found = entry; | |
7644c16c MW |
530 | efivars->ops->set_variable(entry->var.VariableName, |
531 | &entry->var.VendorGuid, | |
532 | PSTORE_EFI_ATTRIBUTES, | |
c475594d | 533 | 0, NULL); |
5ee9c198 MG |
534 | } |
535 | ||
536 | if (found) | |
537 | list_del(&found->list); | |
538 | ||
539 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
540 | efi_name[i] = name[i]; | |
541 | ||
7644c16c | 542 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
543 | size, psi->buf); |
544 | ||
545 | spin_unlock(&efivars->lock); | |
546 | ||
547 | if (found) | |
548 | efivar_unregister(found); | |
549 | ||
550 | if (size) | |
a2940908 MW |
551 | efivar_create_sysfs_entry(efivars, |
552 | utf16_strsize(efi_name, | |
553 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
554 | efi_name, &vendor); |
555 | ||
556 | return part; | |
557 | }; | |
558 | ||
559 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
560 | struct pstore_info *psi) | |
561 | { | |
562 | efi_pstore_write(type, id, 0, psi); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | #else | |
567 | static int efi_pstore_open(struct pstore_info *psi) | |
568 | { | |
569 | return 0; | |
570 | } | |
571 | ||
572 | static int efi_pstore_close(struct pstore_info *psi) | |
573 | { | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
578 | struct timespec *time, struct pstore_info *psi) | |
579 | { | |
580 | return -1; | |
581 | } | |
582 | ||
b728a5c8 TL |
583 | static u64 efi_pstore_write(enum pstore_type_id type, unsigned int part, |
584 | size_t size, struct pstore_info *psi) | |
5ee9c198 MG |
585 | { |
586 | return 0; | |
587 | } | |
588 | ||
589 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
590 | struct pstore_info *psi) | |
591 | { | |
592 | return 0; | |
593 | } | |
594 | #endif | |
595 | ||
596 | static struct pstore_info efi_pstore_info = { | |
597 | .owner = THIS_MODULE, | |
598 | .name = "efi", | |
599 | .open = efi_pstore_open, | |
600 | .close = efi_pstore_close, | |
601 | .read = efi_pstore_read, | |
602 | .write = efi_pstore_write, | |
603 | .erase = efi_pstore_erase, | |
604 | }; | |
1da177e4 | 605 | |
2c3c8bea | 606 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
607 | struct bin_attribute *bin_attr, |
608 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
609 | { |
610 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 611 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 612 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 613 | unsigned long strsize1, strsize2; |
1da177e4 LT |
614 | efi_status_t status = EFI_NOT_FOUND; |
615 | int found = 0; | |
616 | ||
617 | if (!capable(CAP_SYS_ADMIN)) | |
618 | return -EACCES; | |
619 | ||
29422693 | 620 | spin_lock(&efivars->lock); |
1da177e4 LT |
621 | |
622 | /* | |
623 | * Does this variable already exist? | |
624 | */ | |
29422693 | 625 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
626 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
627 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
628 | if (strsize1 == strsize2 && |
629 | !memcmp(&(search_efivar->var.VariableName), | |
630 | new_var->VariableName, strsize1) && | |
631 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
632 | new_var->VendorGuid)) { | |
633 | found = 1; | |
634 | break; | |
635 | } | |
636 | } | |
637 | if (found) { | |
29422693 | 638 | spin_unlock(&efivars->lock); |
1da177e4 LT |
639 | return -EINVAL; |
640 | } | |
641 | ||
642 | /* now *really* create the variable via EFI */ | |
3295814d MW |
643 | status = efivars->ops->set_variable(new_var->VariableName, |
644 | &new_var->VendorGuid, | |
645 | new_var->Attributes, | |
646 | new_var->DataSize, | |
647 | new_var->Data); | |
1da177e4 LT |
648 | |
649 | if (status != EFI_SUCCESS) { | |
650 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
651 | status); | |
29422693 | 652 | spin_unlock(&efivars->lock); |
1da177e4 LT |
653 | return -EIO; |
654 | } | |
29422693 | 655 | spin_unlock(&efivars->lock); |
1da177e4 LT |
656 | |
657 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 658 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
659 | utf16_strsize(new_var->VariableName, |
660 | 1024), | |
4142ef14 MW |
661 | new_var->VariableName, |
662 | &new_var->VendorGuid); | |
1da177e4 LT |
663 | if (status) { |
664 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
665 | } | |
666 | return count; | |
667 | } | |
668 | ||
2c3c8bea | 669 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
670 | struct bin_attribute *bin_attr, |
671 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
672 | { |
673 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 674 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 675 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 676 | unsigned long strsize1, strsize2; |
1da177e4 LT |
677 | efi_status_t status = EFI_NOT_FOUND; |
678 | int found = 0; | |
679 | ||
680 | if (!capable(CAP_SYS_ADMIN)) | |
681 | return -EACCES; | |
682 | ||
29422693 | 683 | spin_lock(&efivars->lock); |
1da177e4 LT |
684 | |
685 | /* | |
686 | * Does this variable already exist? | |
687 | */ | |
29422693 | 688 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
689 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
690 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
691 | if (strsize1 == strsize2 && |
692 | !memcmp(&(search_efivar->var.VariableName), | |
693 | del_var->VariableName, strsize1) && | |
694 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
695 | del_var->VendorGuid)) { | |
696 | found = 1; | |
697 | break; | |
698 | } | |
699 | } | |
700 | if (!found) { | |
29422693 | 701 | spin_unlock(&efivars->lock); |
1da177e4 LT |
702 | return -EINVAL; |
703 | } | |
704 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
705 | del_var->Attributes = 0; | |
706 | del_var->DataSize = 0; | |
707 | ||
3295814d MW |
708 | status = efivars->ops->set_variable(del_var->VariableName, |
709 | &del_var->VendorGuid, | |
710 | del_var->Attributes, | |
711 | del_var->DataSize, | |
712 | del_var->Data); | |
1da177e4 LT |
713 | |
714 | if (status != EFI_SUCCESS) { | |
715 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
716 | status); | |
29422693 | 717 | spin_unlock(&efivars->lock); |
1da177e4 LT |
718 | return -EIO; |
719 | } | |
496a0fc8 | 720 | list_del(&search_efivar->list); |
1da177e4 | 721 | /* We need to release this lock before unregistering. */ |
29422693 | 722 | spin_unlock(&efivars->lock); |
1da177e4 LT |
723 | efivar_unregister(search_efivar); |
724 | ||
725 | /* It's dead Jim.... */ | |
726 | return count; | |
727 | } | |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Let's not leave out systab information that snuck into | |
731 | * the efivars driver | |
732 | */ | |
334c6307 GKH |
733 | static ssize_t systab_show(struct kobject *kobj, |
734 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
735 | { |
736 | char *str = buf; | |
737 | ||
334c6307 | 738 | if (!kobj || !buf) |
1da177e4 LT |
739 | return -EINVAL; |
740 | ||
b2c99e3c BH |
741 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
742 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
743 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
744 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
745 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
746 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
747 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
748 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
749 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
750 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
751 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
752 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
753 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
754 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
755 | |
756 | return str - buf; | |
757 | } | |
758 | ||
334c6307 GKH |
759 | static struct kobj_attribute efi_attr_systab = |
760 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 761 | |
334c6307 GKH |
762 | static struct attribute *efi_subsys_attrs[] = { |
763 | &efi_attr_systab.attr, | |
1da177e4 LT |
764 | NULL, /* maybe more in the future? */ |
765 | }; | |
766 | ||
334c6307 GKH |
767 | static struct attribute_group efi_subsys_attr_group = { |
768 | .attrs = efi_subsys_attrs, | |
769 | }; | |
770 | ||
bc87d2fe | 771 | static struct kobject *efi_kobj; |
1da177e4 LT |
772 | |
773 | /* | |
774 | * efivar_create_sysfs_entry() | |
775 | * Requires: | |
776 | * variable_name_size = number of bytes required to hold | |
777 | * variable_name (not counting the NULL | |
778 | * character at the end. | |
29422693 | 779 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
780 | * Returns 1 on failure, 0 on success |
781 | */ | |
782 | static int | |
4142ef14 MW |
783 | efivar_create_sysfs_entry(struct efivars *efivars, |
784 | unsigned long variable_name_size, | |
785 | efi_char16_t *variable_name, | |
786 | efi_guid_t *vendor_guid) | |
1da177e4 LT |
787 | { |
788 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | |
789 | char *short_name; | |
790 | struct efivar_entry *new_efivar; | |
791 | ||
9c215384 DS |
792 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
793 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
1da177e4 LT |
794 | |
795 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
796 | kfree(short_name); |
797 | kfree(new_efivar); | |
1da177e4 LT |
798 | return 1; |
799 | } | |
1da177e4 | 800 | |
4142ef14 | 801 | new_efivar->efivars = efivars; |
1da177e4 LT |
802 | memcpy(new_efivar->var.VariableName, variable_name, |
803 | variable_name_size); | |
804 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
805 | ||
806 | /* Convert Unicode to normal chars (assume top bits are 0), | |
807 | ala UTF-8 */ | |
808 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
809 | short_name[i] = variable_name[i] & 0xFF; | |
810 | } | |
811 | /* This is ugly, but necessary to separate one vendor's | |
812 | private variables from another's. */ | |
813 | ||
814 | *(short_name + strlen(short_name)) = '-'; | |
815 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
816 | ||
29422693 | 817 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
818 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
819 | "%s", short_name); | |
69b2186c JG |
820 | if (i) { |
821 | kfree(short_name); | |
822 | kfree(new_efivar); | |
823 | return 1; | |
824 | } | |
1da177e4 | 825 | |
d6d292c4 | 826 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
827 | kfree(short_name); |
828 | short_name = NULL; | |
1da177e4 | 829 | |
29422693 MW |
830 | spin_lock(&efivars->lock); |
831 | list_add(&new_efivar->list, &efivars->list); | |
832 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
833 | |
834 | return 0; | |
835 | } | |
d502fbb0 MW |
836 | |
837 | static int | |
838 | create_efivars_bin_attributes(struct efivars *efivars) | |
839 | { | |
840 | struct bin_attribute *attr; | |
841 | int error; | |
842 | ||
843 | /* new_var */ | |
844 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
845 | if (!attr) | |
846 | return -ENOMEM; | |
847 | ||
848 | attr->attr.name = "new_var"; | |
849 | attr->attr.mode = 0200; | |
850 | attr->write = efivar_create; | |
851 | attr->private = efivars; | |
852 | efivars->new_var = attr; | |
853 | ||
854 | /* del_var */ | |
855 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
856 | if (!attr) { | |
857 | error = -ENOMEM; | |
858 | goto out_free; | |
859 | } | |
860 | attr->attr.name = "del_var"; | |
861 | attr->attr.mode = 0200; | |
862 | attr->write = efivar_delete; | |
863 | attr->private = efivars; | |
864 | efivars->del_var = attr; | |
865 | ||
866 | sysfs_bin_attr_init(efivars->new_var); | |
867 | sysfs_bin_attr_init(efivars->del_var); | |
868 | ||
869 | /* Register */ | |
870 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
871 | efivars->new_var); | |
872 | if (error) { | |
873 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
874 | " due to error %d\n", error); | |
875 | goto out_free; | |
876 | } | |
877 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
878 | efivars->del_var); | |
879 | if (error) { | |
880 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
881 | " due to error %d\n", error); | |
882 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
883 | efivars->new_var); | |
884 | goto out_free; | |
885 | } | |
886 | ||
887 | return 0; | |
888 | out_free: | |
051d51bc DC |
889 | kfree(efivars->del_var); |
890 | efivars->del_var = NULL; | |
d502fbb0 MW |
891 | kfree(efivars->new_var); |
892 | efivars->new_var = NULL; | |
893 | return error; | |
894 | } | |
895 | ||
4fc756bd | 896 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
897 | { |
898 | struct efivar_entry *entry, *n; | |
4142ef14 | 899 | |
76b53f7c MW |
900 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
901 | spin_lock(&efivars->lock); | |
902 | list_del(&entry->list); | |
903 | spin_unlock(&efivars->lock); | |
904 | efivar_unregister(entry); | |
905 | } | |
906 | if (efivars->new_var) | |
907 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
908 | if (efivars->del_var) | |
909 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
910 | kfree(efivars->new_var); | |
911 | kfree(efivars->del_var); | |
912 | kset_unregister(efivars->kset); | |
913 | } | |
4fc756bd | 914 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 915 | |
4fc756bd MW |
916 | int register_efivars(struct efivars *efivars, |
917 | const struct efivar_operations *ops, | |
918 | struct kobject *parent_kobj) | |
1da177e4 LT |
919 | { |
920 | efi_status_t status = EFI_NOT_FOUND; | |
921 | efi_guid_t vendor_guid; | |
922 | efi_char16_t *variable_name; | |
1da177e4 | 923 | unsigned long variable_name_size = 1024; |
334c6307 | 924 | int error = 0; |
1da177e4 | 925 | |
9c215384 | 926 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
927 | if (!variable_name) { |
928 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
929 | return -ENOMEM; | |
930 | } | |
931 | ||
29422693 MW |
932 | spin_lock_init(&efivars->lock); |
933 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 934 | efivars->ops = ops; |
29422693 | 935 | |
76b53f7c | 936 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 937 | if (!efivars->kset) { |
66ac831e GKH |
938 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
939 | error = -ENOMEM; | |
76b53f7c | 940 | goto out; |
1da177e4 LT |
941 | } |
942 | ||
943 | /* | |
944 | * Per EFI spec, the maximum storage allocated for both | |
945 | * the variable name and variable data is 1024 bytes. | |
946 | */ | |
947 | ||
948 | do { | |
949 | variable_name_size = 1024; | |
950 | ||
3295814d | 951 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
952 | variable_name, |
953 | &vendor_guid); | |
954 | switch (status) { | |
955 | case EFI_SUCCESS: | |
4142ef14 MW |
956 | efivar_create_sysfs_entry(efivars, |
957 | variable_name_size, | |
958 | variable_name, | |
959 | &vendor_guid); | |
1da177e4 LT |
960 | break; |
961 | case EFI_NOT_FOUND: | |
962 | break; | |
963 | default: | |
964 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
965 | status); | |
966 | status = EFI_NOT_FOUND; | |
967 | break; | |
968 | } | |
969 | } while (status != EFI_NOT_FOUND); | |
970 | ||
d502fbb0 | 971 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 972 | if (error) |
76b53f7c | 973 | unregister_efivars(efivars); |
1da177e4 | 974 | |
5ee9c198 MG |
975 | efivars->efi_pstore_info = efi_pstore_info; |
976 | ||
977 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
978 | if (efivars->efi_pstore_info.buf) { | |
979 | efivars->efi_pstore_info.bufsize = 1024; | |
980 | efivars->efi_pstore_info.data = efivars; | |
981 | mutex_init(&efivars->efi_pstore_info.buf_mutex); | |
982 | pstore_register(&efivars->efi_pstore_info); | |
983 | } | |
984 | ||
76b53f7c MW |
985 | out: |
986 | kfree(variable_name); | |
1da177e4 | 987 | |
76b53f7c MW |
988 | return error; |
989 | } | |
4fc756bd | 990 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 991 | |
76b53f7c | 992 | static struct efivars __efivars; |
3295814d | 993 | static struct efivar_operations ops; |
76b53f7c MW |
994 | |
995 | /* | |
996 | * For now we register the efi subsystem with the firmware subsystem | |
997 | * and the vars subsystem with the efi subsystem. In the future, it | |
998 | * might make sense to split off the efi subsystem into its own | |
999 | * driver, but for now only efivars will register with it, so just | |
1000 | * include it here. | |
1001 | */ | |
1002 | ||
1003 | static int __init | |
1004 | efivars_init(void) | |
1005 | { | |
1006 | int error = 0; | |
1007 | ||
1008 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1009 | EFIVARS_DATE); | |
1010 | ||
1011 | if (!efi_enabled) | |
4fc756bd | 1012 | return 0; |
76b53f7c MW |
1013 | |
1014 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1015 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1016 | if (!efi_kobj) { | |
1017 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1018 | return -ENOMEM; | |
1019 | } | |
1020 | ||
3295814d MW |
1021 | ops.get_variable = efi.get_variable; |
1022 | ops.set_variable = efi.set_variable; | |
1023 | ops.get_next_variable = efi.get_next_variable; | |
1024 | error = register_efivars(&__efivars, &ops, efi_kobj); | |
3116aabc DC |
1025 | if (error) |
1026 | goto err_put; | |
76b53f7c MW |
1027 | |
1028 | /* Don't forget the systab entry */ | |
1029 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1030 | if (error) { | |
1031 | printk(KERN_ERR | |
1032 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1033 | error); | |
3116aabc | 1034 | goto err_unregister; |
76b53f7c | 1035 | } |
1da177e4 | 1036 | |
3116aabc DC |
1037 | return 0; |
1038 | ||
1039 | err_unregister: | |
1040 | unregister_efivars(&__efivars); | |
1041 | err_put: | |
1042 | kobject_put(efi_kobj); | |
1da177e4 LT |
1043 | return error; |
1044 | } | |
1045 | ||
1046 | static void __exit | |
1047 | efivars_exit(void) | |
1048 | { | |
aabb6e15 RD |
1049 | if (efi_enabled) { |
1050 | unregister_efivars(&__efivars); | |
1051 | kobject_put(efi_kobj); | |
1052 | } | |
1da177e4 LT |
1053 | } |
1054 | ||
1055 | module_init(efivars_init); | |
1056 | module_exit(efivars_exit); | |
1057 |