blob: d25599f2a3f8bbb882ada61957239f030a06fa18 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Randy.Dunlapc59ede72006-01-11 12:17:46 -080068#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <linux/types.h>
70#include <linux/errno.h>
71#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090080#include <linux/slab.h>
Matthew Garrett5ee9c192011-07-21 16:57:56 -040081#include <linux/pstore.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83#include <asm/uaccess.h>
84
85#define EFIVARS_VERSION "0.08"
86#define EFIVARS_DATE "2004-May-17"
87
88MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
89MODULE_DESCRIPTION("sysfs interface to EFI Variables");
90MODULE_LICENSE("GPL");
91MODULE_VERSION(EFIVARS_VERSION);
92
Matthew Garrett5ee9c192011-07-21 16:57:56 -040093#define DUMP_NAME_LEN 52
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095/*
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
102struct 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
112struct efivar_entry {
Mike Waychison4142ef12011-03-11 17:43:11 -0800113 struct efivars *efivars;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 struct efi_variable var;
115 struct list_head list;
116 struct kobject kobj;
117};
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119struct 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
Mike Waychison7644c162011-07-21 16:58:00 -0400125#define PSTORE_EFI_ATTRIBUTES \
126 (EFI_VARIABLE_NON_VOLATILE | \
127 EFI_VARIABLE_BOOTSERVICE_ACCESS | \
128 EFI_VARIABLE_RUNTIME_ACCESS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#define EFIVAR_ATTR(_name, _mode, _show, _store) \
131struct efivar_attribute efivar_attr_##_name = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900132 .attr = {.name = __stringify(_name), .mode = _mode}, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 .show = _show, \
134 .store = _store, \
135};
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#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 */
143static int
Mike Waychison4142ef12011-03-11 17:43:11 -0800144efivar_create_sysfs_entry(struct efivars *efivars,
145 unsigned long variable_name_size,
146 efi_char16_t *variable_name,
147 efi_guid_t *vendor_guid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149/* Return the number of unicode characters in data */
150static unsigned long
Mike Waychisona2940902011-07-21 16:57:57 -0400151utf16_strnlen(efi_char16_t *s, size_t maxlength)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 unsigned long length = 0;
154
Mike Waychisona2940902011-07-21 16:57:57 -0400155 while (*s++ != 0 && length < maxlength)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 length++;
157 return length;
158}
159
Tony Luckb728a5c2011-08-02 15:08:30 -0700160static inline unsigned long
Mike Waychisona2940902011-07-21 16:57:57 -0400161utf16_strlen(efi_char16_t *s)
162{
163 return utf16_strnlen(s, ~0UL);
164}
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166/*
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 */
170static inline unsigned long
Mike Waychisona2940902011-07-21 16:57:57 -0400171utf16_strsize(efi_char16_t *data, unsigned long maxlength)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Mike Waychisona2940902011-07-21 16:57:57 -0400173 return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
Mike Waychison828aa1f2011-07-21 16:57:58 -0400176static inline int
177utf16_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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194static efi_status_t
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400195get_var_data_locked(struct efivars *efivars, struct efi_variable *var)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 efi_status_t status;
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 var->DataSize = 1024;
Mike Waychison32958142011-03-11 17:43:21 -0800200 status = efivars->ops->get_variable(var->VariableName,
201 &var->VendorGuid,
202 &var->Attributes,
203 &var->DataSize,
204 var->Data);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400205 return status;
206}
207
208static efi_status_t
209get_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);
Mike Waychison29422692011-03-11 17:43:00 -0800215 spin_unlock(&efivars->lock);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (status != EFI_SUCCESS) {
218 printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n",
219 status);
220 }
221 return status;
222}
223
224static ssize_t
225efivar_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
240static ssize_t
241efivar_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
Mike Waychison4142ef12011-03-11 17:43:11 -0800250 status = get_var_data(entry->efivars, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 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
263static ssize_t
264efivar_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
Mike Waychison4142ef12011-03-11 17:43:11 -0800273 status = get_var_data(entry->efivars, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 if (status != EFI_SUCCESS)
275 return -EIO;
276
277 str += sprintf(str, "0x%lx\n", var->DataSize);
278 return str - buf;
279}
280
281static ssize_t
282efivar_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
Mike Waychison4142ef12011-03-11 17:43:11 -0800290 status = get_var_data(entry->efivars, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 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 */
301static ssize_t
302efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
303{
304 struct efi_variable *new_var, *var = &entry->var;
Mike Waychison4142ef12011-03-11 17:43:11 -0800305 struct efivars *efivars = entry->efivars;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 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
Mike Waychison29422692011-03-11 17:43:00 -0800327 spin_lock(&efivars->lock);
Mike Waychison32958142011-03-11 17:43:21 -0800328 status = efivars->ops->set_variable(new_var->VariableName,
329 &new_var->VendorGuid,
330 new_var->Attributes,
331 new_var->DataSize,
332 new_var->Data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Mike Waychison29422692011-03-11 17:43:00 -0800334 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
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
346static ssize_t
347efivar_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
Mike Waychison4142ef12011-03-11 17:43:11 -0800355 status = get_var_data(entry->efivars, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 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
Justin P. Mattock70f23fd2011-05-10 10:16:21 +0200365 * the attributes...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 */
367static 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);
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500372 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
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
383static 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);
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500388 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
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
Emese Revfy52cf25d2010-01-19 02:58:23 +0100399static const struct sysfs_ops efivar_attr_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 .show = efivar_attr_show,
401 .store = efivar_attr_store,
402};
403
404static void efivar_release(struct kobject *kobj)
405{
406 struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 kfree(var);
408}
409
410static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
411static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
412static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
413static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
414static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
415
416static 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
Greg Kroah-Hartmane89a4112007-10-11 10:47:49 -0600425static struct kobj_type efivar_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 .release = efivar_release,
427 .sysfs_ops = &efivar_attr_ops,
428 .default_attrs = def_attrs,
429};
430
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400431static struct pstore_info efi_pstore_info;
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433static inline void
434efivar_unregister(struct efivar_entry *var)
435{
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800436 kobject_put(&var->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437}
438
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400439#ifdef CONFIG_PSTORE
440
441static 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
451static 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
459static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
Kees Cookf6f82852011-11-17 12:58:07 -0800460 struct timespec *timespec,
461 char **buf, struct pstore_info *psi)
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400462{
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;
Kees Cookf6f82852011-11-17 12:58:07 -0800482 *buf = kmalloc(size, GFP_KERNEL);
483 if (*buf == NULL)
484 return -ENOMEM;
485 memcpy(*buf, efivars->walk_entry->var.Data,
486 size);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400487 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
Kees Cook3d6d8d22011-11-17 13:13:29 -0800498static int efi_pstore_write(enum pstore_type_id type,
499 enum kmsg_dump_reason reason, u64 *id,
Chen Gongb238b8f2011-10-12 09:17:24 -0700500 unsigned int part, size_t size, struct pstore_info *psi)
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400501{
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;
Chen Gongb238b8f2011-10-12 09:17:24 -0700508 int i, ret = 0;
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400509
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
Mike Waychisonc4755942011-07-21 16:57:59 -0400525 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;
Mike Waychison7644c162011-07-21 16:58:00 -0400536 efivars->ops->set_variable(entry->var.VariableName,
537 &entry->var.VendorGuid,
538 PSTORE_EFI_ATTRIBUTES,
Mike Waychisonc4755942011-07-21 16:57:59 -0400539 0, NULL);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400540 }
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
Mike Waychison7644c162011-07-21 16:58:00 -0400548 efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400549 size, psi->buf);
550
551 spin_unlock(&efivars->lock);
552
553 if (found)
554 efivar_unregister(found);
555
556 if (size)
Chen Gongb238b8f2011-10-12 09:17:24 -0700557 ret = efivar_create_sysfs_entry(efivars,
Mike Waychisona2940902011-07-21 16:57:57 -0400558 utf16_strsize(efi_name,
559 DUMP_NAME_LEN * 2),
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400560 efi_name, &vendor);
561
Chen Gongb238b8f2011-10-12 09:17:24 -0700562 *id = part;
563 return ret;
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400564};
565
566static int efi_pstore_erase(enum pstore_type_id type, u64 id,
567 struct pstore_info *psi)
568{
Kees Cook3d6d8d22011-11-17 13:13:29 -0800569 efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400570
571 return 0;
572}
573#else
574static int efi_pstore_open(struct pstore_info *psi)
575{
576 return 0;
577}
578
579static int efi_pstore_close(struct pstore_info *psi)
580{
581 return 0;
582}
583
584static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
Christoph Fritzeee628d2011-11-28 23:49:33 +0100585 struct timespec *timespec,
586 char **buf, struct pstore_info *psi)
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400587{
588 return -1;
589}
590
Kees Cook3d6d8d22011-11-17 13:13:29 -0800591static int efi_pstore_write(enum pstore_type_id type,
592 enum kmsg_dump_reason reason, u64 *id,
Chen Gongb238b8f2011-10-12 09:17:24 -0700593 unsigned int part, size_t size, struct pstore_info *psi)
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400594{
595 return 0;
596}
597
598static int efi_pstore_erase(enum pstore_type_id type, u64 id,
599 struct pstore_info *psi)
600{
601 return 0;
602}
603#endif
604
605static 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};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Chris Wright2c3c8be2010-05-12 18:28:57 -0700615static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
Greg Kroah-Hartman97fa5bb2007-11-07 13:56:19 -0800616 struct bin_attribute *bin_attr,
617 char *buf, loff_t pos, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618{
619 struct efi_variable *new_var = (struct efi_variable *)buf;
Mike Waychison4142ef12011-03-11 17:43:11 -0800620 struct efivars *efivars = bin_attr->private;
Matt Domsch496a0fc2007-01-26 00:57:18 -0800621 struct efivar_entry *search_efivar, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 unsigned long strsize1, strsize2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 efi_status_t status = EFI_NOT_FOUND;
624 int found = 0;
625
626 if (!capable(CAP_SYS_ADMIN))
627 return -EACCES;
628
Mike Waychison29422692011-03-11 17:43:00 -0800629 spin_lock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 /*
632 * Does this variable already exist?
633 */
Mike Waychison29422692011-03-11 17:43:00 -0800634 list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
Mike Waychisona2940902011-07-21 16:57:57 -0400635 strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
636 strsize2 = utf16_strsize(new_var->VariableName, 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 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) {
Mike Waychison29422692011-03-11 17:43:00 -0800647 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 return -EINVAL;
649 }
650
651 /* now *really* create the variable via EFI */
Mike Waychison32958142011-03-11 17:43:21 -0800652 status = efivars->ops->set_variable(new_var->VariableName,
653 &new_var->VendorGuid,
654 new_var->Attributes,
655 new_var->DataSize,
656 new_var->Data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658 if (status != EFI_SUCCESS) {
659 printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
660 status);
Mike Waychison29422692011-03-11 17:43:00 -0800661 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return -EIO;
663 }
Mike Waychison29422692011-03-11 17:43:00 -0800664 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 /* Create the entry in sysfs. Locking is not required here */
Mike Waychison4142ef12011-03-11 17:43:11 -0800667 status = efivar_create_sysfs_entry(efivars,
Mike Waychisona2940902011-07-21 16:57:57 -0400668 utf16_strsize(new_var->VariableName,
669 1024),
Mike Waychison4142ef12011-03-11 17:43:11 -0800670 new_var->VariableName,
671 &new_var->VendorGuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 if (status) {
673 printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n");
674 }
675 return count;
676}
677
Chris Wright2c3c8be2010-05-12 18:28:57 -0700678static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
Greg Kroah-Hartman97fa5bb2007-11-07 13:56:19 -0800679 struct bin_attribute *bin_attr,
680 char *buf, loff_t pos, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
682 struct efi_variable *del_var = (struct efi_variable *)buf;
Mike Waychison4142ef12011-03-11 17:43:11 -0800683 struct efivars *efivars = bin_attr->private;
Matt Domsch496a0fc2007-01-26 00:57:18 -0800684 struct efivar_entry *search_efivar, *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 unsigned long strsize1, strsize2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 efi_status_t status = EFI_NOT_FOUND;
687 int found = 0;
688
689 if (!capable(CAP_SYS_ADMIN))
690 return -EACCES;
691
Mike Waychison29422692011-03-11 17:43:00 -0800692 spin_lock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694 /*
695 * Does this variable already exist?
696 */
Mike Waychison29422692011-03-11 17:43:00 -0800697 list_for_each_entry_safe(search_efivar, n, &efivars->list, list) {
Mike Waychisona2940902011-07-21 16:57:57 -0400698 strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024);
699 strsize2 = utf16_strsize(del_var->VariableName, 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 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) {
Mike Waychison29422692011-03-11 17:43:00 -0800710 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 return -EINVAL;
712 }
713 /* force the Attributes/DataSize to 0 to ensure deletion */
714 del_var->Attributes = 0;
715 del_var->DataSize = 0;
716
Mike Waychison32958142011-03-11 17:43:21 -0800717 status = efivars->ops->set_variable(del_var->VariableName,
718 &del_var->VendorGuid,
719 del_var->Attributes,
720 del_var->DataSize,
721 del_var->Data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723 if (status != EFI_SUCCESS) {
724 printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
725 status);
Mike Waychison29422692011-03-11 17:43:00 -0800726 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return -EIO;
728 }
Matt Domsch496a0fc2007-01-26 00:57:18 -0800729 list_del(&search_efivar->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 /* We need to release this lock before unregistering. */
Mike Waychison29422692011-03-11 17:43:00 -0800731 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 efivar_unregister(search_efivar);
733
734 /* It's dead Jim.... */
735 return count;
736}
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738/*
739 * Let's not leave out systab information that snuck into
740 * the efivars driver
741 */
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700742static ssize_t systab_show(struct kobject *kobj,
743 struct kobj_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
745 char *str = buf;
746
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700747 if (!kobj || !buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 return -EINVAL;
749
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800750 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 return str - buf;
766}
767
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700768static struct kobj_attribute efi_attr_systab =
769 __ATTR(systab, 0400, systab_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700771static struct attribute *efi_subsys_attrs[] = {
772 &efi_attr_systab.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 NULL, /* maybe more in the future? */
774};
775
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700776static struct attribute_group efi_subsys_attr_group = {
777 .attrs = efi_subsys_attrs,
778};
779
Greg Kroah-Hartmanbc87d2f2007-11-07 13:56:19 -0800780static struct kobject *efi_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
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.
Mike Waychison29422692011-03-11 17:43:00 -0800788 * efivars->lock is not held on entry or exit.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 * Returns 1 on failure, 0 on success
790 */
791static int
Mike Waychison4142ef12011-03-11 17:43:11 -0800792efivar_create_sysfs_entry(struct efivars *efivars,
793 unsigned long variable_name_size,
794 efi_char16_t *variable_name,
795 efi_guid_t *vendor_guid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
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
Deepak Saxena9c215382005-11-07 01:01:24 -0800801 short_name = kzalloc(short_name_size + 1, GFP_KERNEL);
802 new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
804 if (!short_name || !new_efivar) {
Jesper Juhl0933ad92005-06-25 14:59:15 -0700805 kfree(short_name);
806 kfree(new_efivar);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 return 1;
808 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Mike Waychison4142ef12011-03-11 17:43:11 -0800810 new_efivar->efivars = efivars;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 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
Mike Waychison29422692011-03-11 17:43:00 -0800826 new_efivar->kobj.kset = efivars->kset;
Greg Kroah-Hartmand6d292c2007-12-17 15:54:39 -0400827 i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL,
828 "%s", short_name);
Jeff Garzik69b21862006-10-11 01:22:23 -0700829 if (i) {
830 kfree(short_name);
831 kfree(new_efivar);
832 return 1;
833 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Greg Kroah-Hartmand6d292c2007-12-17 15:54:39 -0400835 kobject_uevent(&new_efivar->kobj, KOBJ_ADD);
Jesper Juhl0933ad92005-06-25 14:59:15 -0700836 kfree(short_name);
837 short_name = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Mike Waychison29422692011-03-11 17:43:00 -0800839 spin_lock(&efivars->lock);
840 list_add(&new_efivar->list, &efivars->list);
841 spin_unlock(&efivars->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 return 0;
844}
Mike Waychisond502fbb2011-03-11 17:43:06 -0800845
846static int
847create_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;
897out_free:
Dan Carpenter051d51b2011-03-18 10:12:14 +0300898 kfree(efivars->del_var);
899 efivars->del_var = NULL;
Mike Waychisond502fbb2011-03-11 17:43:06 -0800900 kfree(efivars->new_var);
901 efivars->new_var = NULL;
902 return error;
903}
904
Mike Waychison4fc756b2011-03-11 17:43:27 -0800905void unregister_efivars(struct efivars *efivars)
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800906{
907 struct efivar_entry *entry, *n;
Mike Waychison4142ef12011-03-11 17:43:11 -0800908
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800909 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}
Mike Waychison4fc756b2011-03-11 17:43:27 -0800923EXPORT_SYMBOL_GPL(unregister_efivars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Mike Waychison4fc756b2011-03-11 17:43:27 -0800925int register_efivars(struct efivars *efivars,
926 const struct efivar_operations *ops,
927 struct kobject *parent_kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928{
929 efi_status_t status = EFI_NOT_FOUND;
930 efi_guid_t vendor_guid;
931 efi_char16_t *variable_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 unsigned long variable_name_size = 1024;
Greg Kroah-Hartman334c6302007-11-02 13:20:40 -0700933 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Deepak Saxena9c215382005-11-07 01:01:24 -0800935 variable_name = kzalloc(variable_name_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 if (!variable_name) {
937 printk(KERN_ERR "efivars: Memory allocation failed.\n");
938 return -ENOMEM;
939 }
940
Mike Waychison29422692011-03-11 17:43:00 -0800941 spin_lock_init(&efivars->lock);
942 INIT_LIST_HEAD(&efivars->list);
Mike Waychison32958142011-03-11 17:43:21 -0800943 efivars->ops = ops;
Mike Waychison29422692011-03-11 17:43:00 -0800944
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800945 efivars->kset = kset_create_and_add("vars", NULL, parent_kobj);
Mike Waychison29422692011-03-11 17:43:00 -0800946 if (!efivars->kset) {
Greg Kroah-Hartman66ac8312007-11-02 13:20:40 -0700947 printk(KERN_ERR "efivars: Subsystem registration failed.\n");
948 error = -ENOMEM;
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800949 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 }
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
Mike Waychison32958142011-03-11 17:43:21 -0800960 status = ops->get_next_variable(&variable_name_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 variable_name,
962 &vendor_guid);
963 switch (status) {
964 case EFI_SUCCESS:
Mike Waychison4142ef12011-03-11 17:43:11 -0800965 efivar_create_sysfs_entry(efivars,
966 variable_name_size,
967 variable_name,
968 &vendor_guid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 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
Mike Waychisond502fbb2011-03-11 17:43:06 -0800980 error = create_efivars_bin_attributes(efivars);
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800981 if (error)
982 unregister_efivars(efivars);
983
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400984 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;
Don Zickusabd4d552011-08-12 10:54:51 -0700990 spin_lock_init(&efivars->efi_pstore_info.buf_lock);
Matthew Garrett5ee9c192011-07-21 16:57:56 -0400991 pstore_register(&efivars->efi_pstore_info);
992 }
993
Mike Waychison76b53f7c2011-03-11 17:43:16 -0800994out:
995 kfree(variable_name);
996
997 return error;
998}
Mike Waychison4fc756b2011-03-11 17:43:27 -0800999EXPORT_SYMBOL_GPL(register_efivars);
Mike Waychison76b53f7c2011-03-11 17:43:16 -08001000
1001static struct efivars __efivars;
Mike Waychison32958142011-03-11 17:43:21 -08001002static struct efivar_operations ops;
Mike Waychison76b53f7c2011-03-11 17:43:16 -08001003
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
1012static int __init
1013efivars_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)
Mike Waychison4fc756b2011-03-11 17:43:27 -08001021 return 0;
Mike Waychison76b53f7c2011-03-11 17:43:16 -08001022
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
Mike Waychison32958142011-03-11 17:43:21 -08001030 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);
Dan Carpenter3116aab2011-03-18 10:12:38 +03001034 if (error)
1035 goto err_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
1037 /* Don't forget the systab entry */
Greg Kroah-Hartmanbc87d2f2007-11-07 13:56:19 -08001038 error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
Mike Waychison76b53f7c2011-03-11 17:43:16 -08001039 if (error) {
1040 printk(KERN_ERR
1041 "efivars: Sysfs attribute export failed with error %d.\n",
1042 error);
Dan Carpenter3116aab2011-03-18 10:12:38 +03001043 goto err_unregister;
Mike Waychison76b53f7c2011-03-11 17:43:16 -08001044 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Dan Carpenter3116aab2011-03-18 10:12:38 +03001046 return 0;
1047
1048err_unregister:
1049 unregister_efivars(&__efivars);
1050err_put:
1051 kobject_put(efi_kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 return error;
1053}
1054
1055static void __exit
1056efivars_exit(void)
1057{
Randy Dunlapaabb6e12011-05-06 13:27:41 -07001058 if (efi_enabled) {
1059 unregister_efivars(&__efivars);
1060 kobject_put(efi_kobj);
1061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062}
1063
1064module_init(efivars_init);
1065module_exit(efivars_exit);
1066