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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, | |
f6f82851 KC |
460 | struct timespec *timespec, |
461 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
462 | { |
463 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
464 | struct efivars *efivars = psi->data; | |
465 | char name[DUMP_NAME_LEN]; | |
466 | int i; | |
467 | unsigned int part, size; | |
468 | unsigned long time; | |
469 | ||
470 | while (&efivars->walk_entry->list != &efivars->list) { | |
471 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
472 | vendor)) { | |
473 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
474 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
475 | } | |
476 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { | |
477 | *id = part; | |
478 | timespec->tv_sec = time; | |
479 | timespec->tv_nsec = 0; | |
480 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
481 | size = efivars->walk_entry->var.DataSize; | |
f6f82851 KC |
482 | *buf = kmalloc(size, GFP_KERNEL); |
483 | if (*buf == NULL) | |
484 | return -ENOMEM; | |
485 | memcpy(*buf, efivars->walk_entry->var.Data, | |
486 | size); | |
5ee9c198 MG |
487 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
488 | struct efivar_entry, list); | |
489 | return size; | |
490 | } | |
491 | } | |
492 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
493 | struct efivar_entry, list); | |
494 | } | |
495 | return 0; | |
496 | } | |
497 | ||
3d6d8d20 KC |
498 | static int efi_pstore_write(enum pstore_type_id type, |
499 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 500 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
501 | { |
502 | char name[DUMP_NAME_LEN]; | |
503 | char stub_name[DUMP_NAME_LEN]; | |
504 | efi_char16_t efi_name[DUMP_NAME_LEN]; | |
505 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
506 | struct efivars *efivars = psi->data; | |
507 | struct efivar_entry *entry, *found = NULL; | |
b238b8fa | 508 | int i, ret = 0; |
5ee9c198 MG |
509 | |
510 | sprintf(stub_name, "dump-type%u-%u-", type, part); | |
511 | sprintf(name, "%s%lu", stub_name, get_seconds()); | |
512 | ||
513 | spin_lock(&efivars->lock); | |
514 | ||
515 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
516 | efi_name[i] = stub_name[i]; | |
517 | ||
518 | /* | |
519 | * Clean up any entries with the same name | |
520 | */ | |
521 | ||
522 | list_for_each_entry(entry, &efivars->list, list) { | |
523 | get_var_data_locked(efivars, &entry->var); | |
524 | ||
c475594d MW |
525 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
526 | continue; | |
527 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
528 | utf16_strlen(efi_name))) | |
529 | continue; | |
530 | /* Needs to be a prefix */ | |
531 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) | |
532 | continue; | |
533 | ||
534 | /* found */ | |
535 | found = entry; | |
7644c16c MW |
536 | efivars->ops->set_variable(entry->var.VariableName, |
537 | &entry->var.VendorGuid, | |
538 | PSTORE_EFI_ATTRIBUTES, | |
c475594d | 539 | 0, NULL); |
5ee9c198 MG |
540 | } |
541 | ||
542 | if (found) | |
543 | list_del(&found->list); | |
544 | ||
545 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
546 | efi_name[i] = name[i]; | |
547 | ||
7644c16c | 548 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
549 | size, psi->buf); |
550 | ||
551 | spin_unlock(&efivars->lock); | |
552 | ||
553 | if (found) | |
554 | efivar_unregister(found); | |
555 | ||
556 | if (size) | |
b238b8fa | 557 | ret = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
558 | utf16_strsize(efi_name, |
559 | DUMP_NAME_LEN * 2), | |
5ee9c198 MG |
560 | efi_name, &vendor); |
561 | ||
b238b8fa CG |
562 | *id = part; |
563 | return ret; | |
5ee9c198 MG |
564 | }; |
565 | ||
566 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
567 | struct pstore_info *psi) | |
568 | { | |
3d6d8d20 | 569 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
5ee9c198 MG |
570 | |
571 | return 0; | |
572 | } | |
573 | #else | |
574 | static int efi_pstore_open(struct pstore_info *psi) | |
575 | { | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static int efi_pstore_close(struct pstore_info *psi) | |
580 | { | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
eee628da CF |
585 | struct timespec *timespec, |
586 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
587 | { |
588 | return -1; | |
589 | } | |
590 | ||
3d6d8d20 KC |
591 | static int efi_pstore_write(enum pstore_type_id type, |
592 | enum kmsg_dump_reason reason, u64 *id, | |
b238b8fa | 593 | unsigned int part, size_t size, struct pstore_info *psi) |
5ee9c198 MG |
594 | { |
595 | return 0; | |
596 | } | |
597 | ||
598 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, | |
599 | struct pstore_info *psi) | |
600 | { | |
601 | return 0; | |
602 | } | |
603 | #endif | |
604 | ||
605 | static struct pstore_info efi_pstore_info = { | |
606 | .owner = THIS_MODULE, | |
607 | .name = "efi", | |
608 | .open = efi_pstore_open, | |
609 | .close = efi_pstore_close, | |
610 | .read = efi_pstore_read, | |
611 | .write = efi_pstore_write, | |
612 | .erase = efi_pstore_erase, | |
613 | }; | |
1da177e4 | 614 | |
2c3c8bea | 615 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
616 | struct bin_attribute *bin_attr, |
617 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
618 | { |
619 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 620 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 621 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 622 | unsigned long strsize1, strsize2; |
1da177e4 LT |
623 | efi_status_t status = EFI_NOT_FOUND; |
624 | int found = 0; | |
625 | ||
626 | if (!capable(CAP_SYS_ADMIN)) | |
627 | return -EACCES; | |
628 | ||
29422693 | 629 | spin_lock(&efivars->lock); |
1da177e4 LT |
630 | |
631 | /* | |
632 | * Does this variable already exist? | |
633 | */ | |
29422693 | 634 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
635 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
636 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
637 | if (strsize1 == strsize2 && |
638 | !memcmp(&(search_efivar->var.VariableName), | |
639 | new_var->VariableName, strsize1) && | |
640 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
641 | new_var->VendorGuid)) { | |
642 | found = 1; | |
643 | break; | |
644 | } | |
645 | } | |
646 | if (found) { | |
29422693 | 647 | spin_unlock(&efivars->lock); |
1da177e4 LT |
648 | return -EINVAL; |
649 | } | |
650 | ||
651 | /* now *really* create the variable via EFI */ | |
3295814d MW |
652 | status = efivars->ops->set_variable(new_var->VariableName, |
653 | &new_var->VendorGuid, | |
654 | new_var->Attributes, | |
655 | new_var->DataSize, | |
656 | new_var->Data); | |
1da177e4 LT |
657 | |
658 | if (status != EFI_SUCCESS) { | |
659 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
660 | status); | |
29422693 | 661 | spin_unlock(&efivars->lock); |
1da177e4 LT |
662 | return -EIO; |
663 | } | |
29422693 | 664 | spin_unlock(&efivars->lock); |
1da177e4 LT |
665 | |
666 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 667 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
668 | utf16_strsize(new_var->VariableName, |
669 | 1024), | |
4142ef14 MW |
670 | new_var->VariableName, |
671 | &new_var->VendorGuid); | |
1da177e4 LT |
672 | if (status) { |
673 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
674 | } | |
675 | return count; | |
676 | } | |
677 | ||
2c3c8bea | 678 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
679 | struct bin_attribute *bin_attr, |
680 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
681 | { |
682 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 683 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 684 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 685 | unsigned long strsize1, strsize2; |
1da177e4 LT |
686 | efi_status_t status = EFI_NOT_FOUND; |
687 | int found = 0; | |
688 | ||
689 | if (!capable(CAP_SYS_ADMIN)) | |
690 | return -EACCES; | |
691 | ||
29422693 | 692 | spin_lock(&efivars->lock); |
1da177e4 LT |
693 | |
694 | /* | |
695 | * Does this variable already exist? | |
696 | */ | |
29422693 | 697 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
698 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
699 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
700 | if (strsize1 == strsize2 && |
701 | !memcmp(&(search_efivar->var.VariableName), | |
702 | del_var->VariableName, strsize1) && | |
703 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
704 | del_var->VendorGuid)) { | |
705 | found = 1; | |
706 | break; | |
707 | } | |
708 | } | |
709 | if (!found) { | |
29422693 | 710 | spin_unlock(&efivars->lock); |
1da177e4 LT |
711 | return -EINVAL; |
712 | } | |
713 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
714 | del_var->Attributes = 0; | |
715 | del_var->DataSize = 0; | |
716 | ||
3295814d MW |
717 | status = efivars->ops->set_variable(del_var->VariableName, |
718 | &del_var->VendorGuid, | |
719 | del_var->Attributes, | |
720 | del_var->DataSize, | |
721 | del_var->Data); | |
1da177e4 LT |
722 | |
723 | if (status != EFI_SUCCESS) { | |
724 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
725 | status); | |
29422693 | 726 | spin_unlock(&efivars->lock); |
1da177e4 LT |
727 | return -EIO; |
728 | } | |
496a0fc8 | 729 | list_del(&search_efivar->list); |
1da177e4 | 730 | /* We need to release this lock before unregistering. */ |
29422693 | 731 | spin_unlock(&efivars->lock); |
1da177e4 LT |
732 | efivar_unregister(search_efivar); |
733 | ||
734 | /* It's dead Jim.... */ | |
735 | return count; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | /* |
739 | * Let's not leave out systab information that snuck into | |
740 | * the efivars driver | |
741 | */ | |
334c6307 GKH |
742 | static ssize_t systab_show(struct kobject *kobj, |
743 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
744 | { |
745 | char *str = buf; | |
746 | ||
334c6307 | 747 | if (!kobj || !buf) |
1da177e4 LT |
748 | return -EINVAL; |
749 | ||
b2c99e3c BH |
750 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
751 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
752 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
753 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
754 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
755 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
756 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
757 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
758 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
759 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
760 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
761 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
762 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
763 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
764 | |
765 | return str - buf; | |
766 | } | |
767 | ||
334c6307 GKH |
768 | static struct kobj_attribute efi_attr_systab = |
769 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 770 | |
334c6307 GKH |
771 | static struct attribute *efi_subsys_attrs[] = { |
772 | &efi_attr_systab.attr, | |
1da177e4 LT |
773 | NULL, /* maybe more in the future? */ |
774 | }; | |
775 | ||
334c6307 GKH |
776 | static struct attribute_group efi_subsys_attr_group = { |
777 | .attrs = efi_subsys_attrs, | |
778 | }; | |
779 | ||
bc87d2fe | 780 | static struct kobject *efi_kobj; |
1da177e4 LT |
781 | |
782 | /* | |
783 | * efivar_create_sysfs_entry() | |
784 | * Requires: | |
785 | * variable_name_size = number of bytes required to hold | |
786 | * variable_name (not counting the NULL | |
787 | * character at the end. | |
29422693 | 788 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
789 | * Returns 1 on failure, 0 on success |
790 | */ | |
791 | static int | |
4142ef14 MW |
792 | efivar_create_sysfs_entry(struct efivars *efivars, |
793 | unsigned long variable_name_size, | |
794 | efi_char16_t *variable_name, | |
795 | efi_guid_t *vendor_guid) | |
1da177e4 LT |
796 | { |
797 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | |
798 | char *short_name; | |
799 | struct efivar_entry *new_efivar; | |
800 | ||
9c215384 DS |
801 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
802 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
1da177e4 LT |
803 | |
804 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
805 | kfree(short_name); |
806 | kfree(new_efivar); | |
1da177e4 LT |
807 | return 1; |
808 | } | |
1da177e4 | 809 | |
4142ef14 | 810 | new_efivar->efivars = efivars; |
1da177e4 LT |
811 | memcpy(new_efivar->var.VariableName, variable_name, |
812 | variable_name_size); | |
813 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
814 | ||
815 | /* Convert Unicode to normal chars (assume top bits are 0), | |
816 | ala UTF-8 */ | |
817 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
818 | short_name[i] = variable_name[i] & 0xFF; | |
819 | } | |
820 | /* This is ugly, but necessary to separate one vendor's | |
821 | private variables from another's. */ | |
822 | ||
823 | *(short_name + strlen(short_name)) = '-'; | |
824 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
825 | ||
29422693 | 826 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
827 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
828 | "%s", short_name); | |
69b2186c JG |
829 | if (i) { |
830 | kfree(short_name); | |
831 | kfree(new_efivar); | |
832 | return 1; | |
833 | } | |
1da177e4 | 834 | |
d6d292c4 | 835 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
836 | kfree(short_name); |
837 | short_name = NULL; | |
1da177e4 | 838 | |
29422693 MW |
839 | spin_lock(&efivars->lock); |
840 | list_add(&new_efivar->list, &efivars->list); | |
841 | spin_unlock(&efivars->lock); | |
1da177e4 LT |
842 | |
843 | return 0; | |
844 | } | |
d502fbb0 MW |
845 | |
846 | static int | |
847 | create_efivars_bin_attributes(struct efivars *efivars) | |
848 | { | |
849 | struct bin_attribute *attr; | |
850 | int error; | |
851 | ||
852 | /* new_var */ | |
853 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
854 | if (!attr) | |
855 | return -ENOMEM; | |
856 | ||
857 | attr->attr.name = "new_var"; | |
858 | attr->attr.mode = 0200; | |
859 | attr->write = efivar_create; | |
860 | attr->private = efivars; | |
861 | efivars->new_var = attr; | |
862 | ||
863 | /* del_var */ | |
864 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
865 | if (!attr) { | |
866 | error = -ENOMEM; | |
867 | goto out_free; | |
868 | } | |
869 | attr->attr.name = "del_var"; | |
870 | attr->attr.mode = 0200; | |
871 | attr->write = efivar_delete; | |
872 | attr->private = efivars; | |
873 | efivars->del_var = attr; | |
874 | ||
875 | sysfs_bin_attr_init(efivars->new_var); | |
876 | sysfs_bin_attr_init(efivars->del_var); | |
877 | ||
878 | /* Register */ | |
879 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
880 | efivars->new_var); | |
881 | if (error) { | |
882 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
883 | " due to error %d\n", error); | |
884 | goto out_free; | |
885 | } | |
886 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
887 | efivars->del_var); | |
888 | if (error) { | |
889 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
890 | " due to error %d\n", error); | |
891 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
892 | efivars->new_var); | |
893 | goto out_free; | |
894 | } | |
895 | ||
896 | return 0; | |
897 | out_free: | |
051d51bc DC |
898 | kfree(efivars->del_var); |
899 | efivars->del_var = NULL; | |
d502fbb0 MW |
900 | kfree(efivars->new_var); |
901 | efivars->new_var = NULL; | |
902 | return error; | |
903 | } | |
904 | ||
4fc756bd | 905 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
906 | { |
907 | struct efivar_entry *entry, *n; | |
4142ef14 | 908 | |
76b53f7c MW |
909 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
910 | spin_lock(&efivars->lock); | |
911 | list_del(&entry->list); | |
912 | spin_unlock(&efivars->lock); | |
913 | efivar_unregister(entry); | |
914 | } | |
915 | if (efivars->new_var) | |
916 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
917 | if (efivars->del_var) | |
918 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
919 | kfree(efivars->new_var); | |
920 | kfree(efivars->del_var); | |
921 | kset_unregister(efivars->kset); | |
922 | } | |
4fc756bd | 923 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 924 | |
4fc756bd MW |
925 | int register_efivars(struct efivars *efivars, |
926 | const struct efivar_operations *ops, | |
927 | struct kobject *parent_kobj) | |
1da177e4 LT |
928 | { |
929 | efi_status_t status = EFI_NOT_FOUND; | |
930 | efi_guid_t vendor_guid; | |
931 | efi_char16_t *variable_name; | |
1da177e4 | 932 | unsigned long variable_name_size = 1024; |
334c6307 | 933 | int error = 0; |
1da177e4 | 934 | |
9c215384 | 935 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
936 | if (!variable_name) { |
937 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
938 | return -ENOMEM; | |
939 | } | |
940 | ||
29422693 MW |
941 | spin_lock_init(&efivars->lock); |
942 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 943 | efivars->ops = ops; |
29422693 | 944 | |
76b53f7c | 945 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 946 | if (!efivars->kset) { |
66ac831e GKH |
947 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
948 | error = -ENOMEM; | |
76b53f7c | 949 | goto out; |
1da177e4 LT |
950 | } |
951 | ||
952 | /* | |
953 | * Per EFI spec, the maximum storage allocated for both | |
954 | * the variable name and variable data is 1024 bytes. | |
955 | */ | |
956 | ||
957 | do { | |
958 | variable_name_size = 1024; | |
959 | ||
3295814d | 960 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
961 | variable_name, |
962 | &vendor_guid); | |
963 | switch (status) { | |
964 | case EFI_SUCCESS: | |
4142ef14 MW |
965 | efivar_create_sysfs_entry(efivars, |
966 | variable_name_size, | |
967 | variable_name, | |
968 | &vendor_guid); | |
1da177e4 LT |
969 | break; |
970 | case EFI_NOT_FOUND: | |
971 | break; | |
972 | default: | |
973 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
974 | status); | |
975 | status = EFI_NOT_FOUND; | |
976 | break; | |
977 | } | |
978 | } while (status != EFI_NOT_FOUND); | |
979 | ||
d502fbb0 | 980 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 981 | if (error) |
76b53f7c | 982 | unregister_efivars(efivars); |
1da177e4 | 983 | |
5ee9c198 MG |
984 | efivars->efi_pstore_info = efi_pstore_info; |
985 | ||
986 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
987 | if (efivars->efi_pstore_info.buf) { | |
988 | efivars->efi_pstore_info.bufsize = 1024; | |
989 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 990 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
991 | pstore_register(&efivars->efi_pstore_info); |
992 | } | |
993 | ||
76b53f7c MW |
994 | out: |
995 | kfree(variable_name); | |
1da177e4 | 996 | |
76b53f7c MW |
997 | return error; |
998 | } | |
4fc756bd | 999 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 1000 | |
76b53f7c | 1001 | static struct efivars __efivars; |
3295814d | 1002 | static struct efivar_operations ops; |
76b53f7c MW |
1003 | |
1004 | /* | |
1005 | * For now we register the efi subsystem with the firmware subsystem | |
1006 | * and the vars subsystem with the efi subsystem. In the future, it | |
1007 | * might make sense to split off the efi subsystem into its own | |
1008 | * driver, but for now only efivars will register with it, so just | |
1009 | * include it here. | |
1010 | */ | |
1011 | ||
1012 | static int __init | |
1013 | efivars_init(void) | |
1014 | { | |
1015 | int error = 0; | |
1016 | ||
1017 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
1018 | EFIVARS_DATE); | |
1019 | ||
1020 | if (!efi_enabled) | |
4fc756bd | 1021 | return 0; |
76b53f7c MW |
1022 | |
1023 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
1024 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
1025 | if (!efi_kobj) { | |
1026 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
1027 | return -ENOMEM; | |
1028 | } | |
1029 | ||
3295814d MW |
1030 | ops.get_variable = efi.get_variable; |
1031 | ops.set_variable = efi.set_variable; | |
1032 | ops.get_next_variable = efi.get_next_variable; | |
1033 | error = register_efivars(&__efivars, &ops, efi_kobj); | |
3116aabc DC |
1034 | if (error) |
1035 | goto err_put; | |
76b53f7c MW |
1036 | |
1037 | /* Don't forget the systab entry */ | |
1038 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
1039 | if (error) { | |
1040 | printk(KERN_ERR | |
1041 | "efivars: Sysfs attribute export failed with error %d.\n", | |
1042 | error); | |
3116aabc | 1043 | goto err_unregister; |
76b53f7c | 1044 | } |
1da177e4 | 1045 | |
3116aabc DC |
1046 | return 0; |
1047 | ||
1048 | err_unregister: | |
1049 | unregister_efivars(&__efivars); | |
1050 | err_put: | |
1051 | kobject_put(efi_kobj); | |
1da177e4 LT |
1052 | return error; |
1053 | } | |
1054 | ||
1055 | static void __exit | |
1056 | efivars_exit(void) | |
1057 | { | |
aabb6e15 RD |
1058 | if (efi_enabled) { |
1059 | unregister_efivars(&__efivars); | |
1060 | kobject_put(efi_kobj); | |
1061 | } | |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | module_init(efivars_init); | |
1065 | module_exit(efivars_exit); | |
1066 |