diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/firmware/efivars.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/firmware/efivars.c')
-rw-r--r-- | drivers/firmware/efivars.c | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c new file mode 100644 index 00000000000..0287ff65963 --- /dev/null +++ b/drivers/firmware/efivars.c | |||
@@ -0,0 +1,781 @@ | |||
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 | |||
68 | #include <linux/config.h> | ||
69 | #include <linux/types.h> | ||
70 | #include <linux/errno.h> | ||
71 | #include <linux/init.h> | ||
72 | #include <linux/sched.h> /* for capable() */ | ||
73 | #include <linux/mm.h> | ||
74 | #include <linux/module.h> | ||
75 | #include <linux/string.h> | ||
76 | #include <linux/smp.h> | ||
77 | #include <linux/efi.h> | ||
78 | #include <linux/sysfs.h> | ||
79 | #include <linux/kobject.h> | ||
80 | #include <linux/device.h> | ||
81 | |||
82 | #include <asm/uaccess.h> | ||
83 | |||
84 | #define EFIVARS_VERSION "0.08" | ||
85 | #define EFIVARS_DATE "2004-May-17" | ||
86 | |||
87 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | ||
88 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | ||
89 | MODULE_LICENSE("GPL"); | ||
90 | MODULE_VERSION(EFIVARS_VERSION); | ||
91 | |||
92 | /* | ||
93 | * efivars_lock protects two things: | ||
94 | * 1) efivar_list - adds, removals, reads, writes | ||
95 | * 2) efi.[gs]et_variable() calls. | ||
96 | * It must not be held when creating sysfs entries or calling kmalloc. | ||
97 | * efi.get_next_variable() is only called from efivars_init(), | ||
98 | * which is protected by the BKL, so that path is safe. | ||
99 | */ | ||
100 | static DEFINE_SPINLOCK(efivars_lock); | ||
101 | static LIST_HEAD(efivar_list); | ||
102 | |||
103 | /* | ||
104 | * The maximum size of VariableName + Data = 1024 | ||
105 | * Therefore, it's reasonable to save that much | ||
106 | * space in each part of the structure, | ||
107 | * and we use a page for reading/writing. | ||
108 | */ | ||
109 | |||
110 | struct efi_variable { | ||
111 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | ||
112 | efi_guid_t VendorGuid; | ||
113 | unsigned long DataSize; | ||
114 | __u8 Data[1024]; | ||
115 | efi_status_t Status; | ||
116 | __u32 Attributes; | ||
117 | } __attribute__((packed)); | ||
118 | |||
119 | |||
120 | struct efivar_entry { | ||
121 | struct efi_variable var; | ||
122 | struct list_head list; | ||
123 | struct kobject kobj; | ||
124 | }; | ||
125 | |||
126 | #define get_efivar_entry(n) list_entry(n, struct efivar_entry, list) | ||
127 | |||
128 | struct efivar_attribute { | ||
129 | struct attribute attr; | ||
130 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | ||
131 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | ||
132 | }; | ||
133 | |||
134 | |||
135 | #define EFI_ATTR(_name, _mode, _show, _store) \ | ||
136 | struct subsys_attribute efi_attr_##_name = { \ | ||
137 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | ||
138 | .show = _show, \ | ||
139 | .store = _store, \ | ||
140 | }; | ||
141 | |||
142 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ | ||
143 | struct efivar_attribute efivar_attr_##_name = { \ | ||
144 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | ||
145 | .show = _show, \ | ||
146 | .store = _store, \ | ||
147 | }; | ||
148 | |||
149 | #define VAR_SUBSYS_ATTR(_name, _mode, _show, _store) \ | ||
150 | struct subsys_attribute var_subsys_attr_##_name = { \ | ||
151 | .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ | ||
152 | .show = _show, \ | ||
153 | .store = _store, \ | ||
154 | }; | ||
155 | |||
156 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) | ||
157 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | ||
158 | |||
159 | /* | ||
160 | * Prototype for sysfs creation function | ||
161 | */ | ||
162 | static int | ||
163 | efivar_create_sysfs_entry(unsigned long variable_name_size, | ||
164 | efi_char16_t *variable_name, | ||
165 | efi_guid_t *vendor_guid); | ||
166 | |||
167 | /* Return the number of unicode characters in data */ | ||
168 | static unsigned long | ||
169 | utf8_strlen(efi_char16_t *data, unsigned long maxlength) | ||
170 | { | ||
171 | unsigned long length = 0; | ||
172 | |||
173 | while (*data++ != 0 && length < maxlength) | ||
174 | length++; | ||
175 | return length; | ||
176 | } | ||
177 | |||
178 | /* | ||
179 | * Return the number of bytes is the length of this string | ||
180 | * Note: this is NOT the same as the number of unicode characters | ||
181 | */ | ||
182 | static inline unsigned long | ||
183 | utf8_strsize(efi_char16_t *data, unsigned long maxlength) | ||
184 | { | ||
185 | return utf8_strlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); | ||
186 | } | ||
187 | |||
188 | static efi_status_t | ||
189 | get_var_data(struct efi_variable *var) | ||
190 | { | ||
191 | efi_status_t status; | ||
192 | |||
193 | spin_lock(&efivars_lock); | ||
194 | var->DataSize = 1024; | ||
195 | status = efi.get_variable(var->VariableName, | ||
196 | &var->VendorGuid, | ||
197 | &var->Attributes, | ||
198 | &var->DataSize, | ||
199 | var->Data); | ||
200 | spin_unlock(&efivars_lock); | ||
201 | if (status != EFI_SUCCESS) { | ||
202 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | ||
203 | status); | ||
204 | } | ||
205 | return status; | ||
206 | } | ||
207 | |||
208 | static ssize_t | ||
209 | efivar_guid_read(struct efivar_entry *entry, char *buf) | ||
210 | { | ||
211 | struct efi_variable *var = &entry->var; | ||
212 | char *str = buf; | ||
213 | |||
214 | if (!entry || !buf) | ||
215 | return 0; | ||
216 | |||
217 | efi_guid_unparse(&var->VendorGuid, str); | ||
218 | str += strlen(str); | ||
219 | str += sprintf(str, "\n"); | ||
220 | |||
221 | return str - buf; | ||
222 | } | ||
223 | |||
224 | static ssize_t | ||
225 | efivar_attr_read(struct efivar_entry *entry, char *buf) | ||
226 | { | ||
227 | struct efi_variable *var = &entry->var; | ||
228 | char *str = buf; | ||
229 | efi_status_t status; | ||
230 | |||
231 | if (!entry || !buf) | ||
232 | return -EINVAL; | ||
233 | |||
234 | status = get_var_data(var); | ||
235 | if (status != EFI_SUCCESS) | ||
236 | return -EIO; | ||
237 | |||
238 | if (var->Attributes & 0x1) | ||
239 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); | ||
240 | if (var->Attributes & 0x2) | ||
241 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); | ||
242 | if (var->Attributes & 0x4) | ||
243 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); | ||
244 | return str - buf; | ||
245 | } | ||
246 | |||
247 | static ssize_t | ||
248 | efivar_size_read(struct efivar_entry *entry, char *buf) | ||
249 | { | ||
250 | struct efi_variable *var = &entry->var; | ||
251 | char *str = buf; | ||
252 | efi_status_t status; | ||
253 | |||
254 | if (!entry || !buf) | ||
255 | return -EINVAL; | ||
256 | |||
257 | status = get_var_data(var); | ||
258 | if (status != EFI_SUCCESS) | ||
259 | return -EIO; | ||
260 | |||
261 | str += sprintf(str, "0x%lx\n", var->DataSize); | ||
262 | return str - buf; | ||
263 | } | ||
264 | |||
265 | static ssize_t | ||
266 | efivar_data_read(struct efivar_entry *entry, char *buf) | ||
267 | { | ||
268 | struct efi_variable *var = &entry->var; | ||
269 | efi_status_t status; | ||
270 | |||
271 | if (!entry || !buf) | ||
272 | return -EINVAL; | ||
273 | |||
274 | status = get_var_data(var); | ||
275 | if (status != EFI_SUCCESS) | ||
276 | return -EIO; | ||
277 | |||
278 | memcpy(buf, var->Data, var->DataSize); | ||
279 | return var->DataSize; | ||
280 | } | ||
281 | /* | ||
282 | * We allow each variable to be edited via rewriting the | ||
283 | * entire efi variable structure. | ||
284 | */ | ||
285 | static ssize_t | ||
286 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | ||
287 | { | ||
288 | struct efi_variable *new_var, *var = &entry->var; | ||
289 | efi_status_t status = EFI_NOT_FOUND; | ||
290 | |||
291 | if (count != sizeof(struct efi_variable)) | ||
292 | return -EINVAL; | ||
293 | |||
294 | new_var = (struct efi_variable *)buf; | ||
295 | /* | ||
296 | * If only updating the variable data, then the name | ||
297 | * and guid should remain the same | ||
298 | */ | ||
299 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | ||
300 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | ||
301 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | ||
302 | return -EINVAL; | ||
303 | } | ||
304 | |||
305 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | ||
306 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | ||
307 | return -EINVAL; | ||
308 | } | ||
309 | |||
310 | spin_lock(&efivars_lock); | ||
311 | status = efi.set_variable(new_var->VariableName, | ||
312 | &new_var->VendorGuid, | ||
313 | new_var->Attributes, | ||
314 | new_var->DataSize, | ||
315 | new_var->Data); | ||
316 | |||
317 | spin_unlock(&efivars_lock); | ||
318 | |||
319 | if (status != EFI_SUCCESS) { | ||
320 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | ||
321 | status); | ||
322 | return -EIO; | ||
323 | } | ||
324 | |||
325 | memcpy(&entry->var, new_var, count); | ||
326 | return count; | ||
327 | } | ||
328 | |||
329 | static ssize_t | ||
330 | efivar_show_raw(struct efivar_entry *entry, char *buf) | ||
331 | { | ||
332 | struct efi_variable *var = &entry->var; | ||
333 | efi_status_t status; | ||
334 | |||
335 | if (!entry || !buf) | ||
336 | return 0; | ||
337 | |||
338 | status = get_var_data(var); | ||
339 | if (status != EFI_SUCCESS) | ||
340 | return -EIO; | ||
341 | |||
342 | memcpy(buf, var, sizeof(*var)); | ||
343 | return sizeof(*var); | ||
344 | } | ||
345 | |||
346 | /* | ||
347 | * Generic read/write functions that call the specific functions of | ||
348 | * the atttributes... | ||
349 | */ | ||
350 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | ||
351 | char *buf) | ||
352 | { | ||
353 | struct efivar_entry *var = to_efivar_entry(kobj); | ||
354 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | ||
355 | ssize_t ret = 0; | ||
356 | |||
357 | if (!capable(CAP_SYS_ADMIN)) | ||
358 | return -EACCES; | ||
359 | |||
360 | if (efivar_attr->show) { | ||
361 | ret = efivar_attr->show(var, buf); | ||
362 | } | ||
363 | return ret; | ||
364 | } | ||
365 | |||
366 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | ||
367 | const char *buf, size_t count) | ||
368 | { | ||
369 | struct efivar_entry *var = to_efivar_entry(kobj); | ||
370 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | ||
371 | ssize_t ret = 0; | ||
372 | |||
373 | if (!capable(CAP_SYS_ADMIN)) | ||
374 | return -EACCES; | ||
375 | |||
376 | if (efivar_attr->store) | ||
377 | ret = efivar_attr->store(var, buf, count); | ||
378 | |||
379 | return ret; | ||
380 | } | ||
381 | |||
382 | static struct sysfs_ops efivar_attr_ops = { | ||
383 | .show = efivar_attr_show, | ||
384 | .store = efivar_attr_store, | ||
385 | }; | ||
386 | |||
387 | static void efivar_release(struct kobject *kobj) | ||
388 | { | ||
389 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | ||
390 | spin_lock(&efivars_lock); | ||
391 | list_del(&var->list); | ||
392 | spin_unlock(&efivars_lock); | ||
393 | kfree(var); | ||
394 | } | ||
395 | |||
396 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | ||
397 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | ||
398 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | ||
399 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | ||
400 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | ||
401 | |||
402 | static struct attribute *def_attrs[] = { | ||
403 | &efivar_attr_guid.attr, | ||
404 | &efivar_attr_size.attr, | ||
405 | &efivar_attr_attributes.attr, | ||
406 | &efivar_attr_data.attr, | ||
407 | &efivar_attr_raw_var.attr, | ||
408 | NULL, | ||
409 | }; | ||
410 | |||
411 | static struct kobj_type ktype_efivar = { | ||
412 | .release = efivar_release, | ||
413 | .sysfs_ops = &efivar_attr_ops, | ||
414 | .default_attrs = def_attrs, | ||
415 | }; | ||
416 | |||
417 | static ssize_t | ||
418 | dummy(struct subsystem *sub, char *buf) | ||
419 | { | ||
420 | return -ENODEV; | ||
421 | } | ||
422 | |||
423 | static inline void | ||
424 | efivar_unregister(struct efivar_entry *var) | ||
425 | { | ||
426 | kobject_unregister(&var->kobj); | ||
427 | } | ||
428 | |||
429 | |||
430 | static ssize_t | ||
431 | efivar_create(struct subsystem *sub, const char *buf, size_t count) | ||
432 | { | ||
433 | struct efi_variable *new_var = (struct efi_variable *)buf; | ||
434 | struct efivar_entry *search_efivar = NULL; | ||
435 | unsigned long strsize1, strsize2; | ||
436 | struct list_head *pos, *n; | ||
437 | efi_status_t status = EFI_NOT_FOUND; | ||
438 | int found = 0; | ||
439 | |||
440 | if (!capable(CAP_SYS_ADMIN)) | ||
441 | return -EACCES; | ||
442 | |||
443 | spin_lock(&efivars_lock); | ||
444 | |||
445 | /* | ||
446 | * Does this variable already exist? | ||
447 | */ | ||
448 | list_for_each_safe(pos, n, &efivar_list) { | ||
449 | search_efivar = get_efivar_entry(pos); | ||
450 | strsize1 = utf8_strsize(search_efivar->var.VariableName, 1024); | ||
451 | strsize2 = utf8_strsize(new_var->VariableName, 1024); | ||
452 | if (strsize1 == strsize2 && | ||
453 | !memcmp(&(search_efivar->var.VariableName), | ||
454 | new_var->VariableName, strsize1) && | ||
455 | !efi_guidcmp(search_efivar->var.VendorGuid, | ||
456 | new_var->VendorGuid)) { | ||
457 | found = 1; | ||
458 | break; | ||
459 | } | ||
460 | } | ||
461 | if (found) { | ||
462 | spin_unlock(&efivars_lock); | ||
463 | return -EINVAL; | ||
464 | } | ||
465 | |||
466 | /* now *really* create the variable via EFI */ | ||
467 | status = efi.set_variable(new_var->VariableName, | ||
468 | &new_var->VendorGuid, | ||
469 | new_var->Attributes, | ||
470 | new_var->DataSize, | ||
471 | new_var->Data); | ||
472 | |||
473 | if (status != EFI_SUCCESS) { | ||
474 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | ||
475 | status); | ||
476 | spin_unlock(&efivars_lock); | ||
477 | return -EIO; | ||
478 | } | ||
479 | spin_unlock(&efivars_lock); | ||
480 | |||
481 | /* Create the entry in sysfs. Locking is not required here */ | ||
482 | status = efivar_create_sysfs_entry(utf8_strsize(new_var->VariableName, | ||
483 | 1024), new_var->VariableName, &new_var->VendorGuid); | ||
484 | if (status) { | ||
485 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | ||
486 | } | ||
487 | return count; | ||
488 | } | ||
489 | |||
490 | static ssize_t | ||
491 | efivar_delete(struct subsystem *sub, const char *buf, size_t count) | ||
492 | { | ||
493 | struct efi_variable *del_var = (struct efi_variable *)buf; | ||
494 | struct efivar_entry *search_efivar = NULL; | ||
495 | unsigned long strsize1, strsize2; | ||
496 | struct list_head *pos, *n; | ||
497 | efi_status_t status = EFI_NOT_FOUND; | ||
498 | int found = 0; | ||
499 | |||
500 | if (!capable(CAP_SYS_ADMIN)) | ||
501 | return -EACCES; | ||
502 | |||
503 | spin_lock(&efivars_lock); | ||
504 | |||
505 | /* | ||
506 | * Does this variable already exist? | ||
507 | */ | ||
508 | list_for_each_safe(pos, n, &efivar_list) { | ||
509 | search_efivar = get_efivar_entry(pos); | ||
510 | strsize1 = utf8_strsize(search_efivar->var.VariableName, 1024); | ||
511 | strsize2 = utf8_strsize(del_var->VariableName, 1024); | ||
512 | if (strsize1 == strsize2 && | ||
513 | !memcmp(&(search_efivar->var.VariableName), | ||
514 | del_var->VariableName, strsize1) && | ||
515 | !efi_guidcmp(search_efivar->var.VendorGuid, | ||
516 | del_var->VendorGuid)) { | ||
517 | found = 1; | ||
518 | break; | ||
519 | } | ||
520 | } | ||
521 | if (!found) { | ||
522 | spin_unlock(&efivars_lock); | ||
523 | return -EINVAL; | ||
524 | } | ||
525 | /* force the Attributes/DataSize to 0 to ensure deletion */ | ||
526 | del_var->Attributes = 0; | ||
527 | del_var->DataSize = 0; | ||
528 | |||
529 | status = efi.set_variable(del_var->VariableName, | ||
530 | &del_var->VendorGuid, | ||
531 | del_var->Attributes, | ||
532 | del_var->DataSize, | ||
533 | del_var->Data); | ||
534 | |||
535 | if (status != EFI_SUCCESS) { | ||
536 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | ||
537 | status); | ||
538 | spin_unlock(&efivars_lock); | ||
539 | return -EIO; | ||
540 | } | ||
541 | /* We need to release this lock before unregistering. */ | ||
542 | spin_unlock(&efivars_lock); | ||
543 | |||
544 | efivar_unregister(search_efivar); | ||
545 | |||
546 | /* It's dead Jim.... */ | ||
547 | return count; | ||
548 | } | ||
549 | |||
550 | static VAR_SUBSYS_ATTR(new_var, 0200, dummy, efivar_create); | ||
551 | static VAR_SUBSYS_ATTR(del_var, 0200, dummy, efivar_delete); | ||
552 | |||
553 | static struct subsys_attribute *var_subsys_attrs[] = { | ||
554 | &var_subsys_attr_new_var, | ||
555 | &var_subsys_attr_del_var, | ||
556 | NULL, | ||
557 | }; | ||
558 | |||
559 | /* | ||
560 | * Let's not leave out systab information that snuck into | ||
561 | * the efivars driver | ||
562 | */ | ||
563 | static ssize_t | ||
564 | systab_read(struct subsystem *entry, char *buf) | ||
565 | { | ||
566 | char *str = buf; | ||
567 | |||
568 | if (!entry || !buf) | ||
569 | return -EINVAL; | ||
570 | |||
571 | if (efi.mps) | ||
572 | str += sprintf(str, "MPS=0x%lx\n", __pa(efi.mps)); | ||
573 | if (efi.acpi20) | ||
574 | str += sprintf(str, "ACPI20=0x%lx\n", __pa(efi.acpi20)); | ||
575 | if (efi.acpi) | ||
576 | str += sprintf(str, "ACPI=0x%lx\n", __pa(efi.acpi)); | ||
577 | if (efi.smbios) | ||
578 | str += sprintf(str, "SMBIOS=0x%lx\n", __pa(efi.smbios)); | ||
579 | if (efi.hcdp) | ||
580 | str += sprintf(str, "HCDP=0x%lx\n", __pa(efi.hcdp)); | ||
581 | if (efi.boot_info) | ||
582 | str += sprintf(str, "BOOTINFO=0x%lx\n", __pa(efi.boot_info)); | ||
583 | if (efi.uga) | ||
584 | str += sprintf(str, "UGA=0x%lx\n", __pa(efi.uga)); | ||
585 | |||
586 | return str - buf; | ||
587 | } | ||
588 | |||
589 | static EFI_ATTR(systab, 0400, systab_read, NULL); | ||
590 | |||
591 | static struct subsys_attribute *efi_subsys_attrs[] = { | ||
592 | &efi_attr_systab, | ||
593 | NULL, /* maybe more in the future? */ | ||
594 | }; | ||
595 | |||
596 | static decl_subsys(vars, &ktype_efivar, NULL); | ||
597 | static decl_subsys(efi, NULL, NULL); | ||
598 | |||
599 | /* | ||
600 | * efivar_create_sysfs_entry() | ||
601 | * Requires: | ||
602 | * variable_name_size = number of bytes required to hold | ||
603 | * variable_name (not counting the NULL | ||
604 | * character at the end. | ||
605 | * efivars_lock is not held on entry or exit. | ||
606 | * Returns 1 on failure, 0 on success | ||
607 | */ | ||
608 | static int | ||
609 | efivar_create_sysfs_entry(unsigned long variable_name_size, | ||
610 | efi_char16_t *variable_name, | ||
611 | efi_guid_t *vendor_guid) | ||
612 | { | ||
613 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; | ||
614 | char *short_name; | ||
615 | struct efivar_entry *new_efivar; | ||
616 | |||
617 | short_name = kmalloc(short_name_size + 1, GFP_KERNEL); | ||
618 | new_efivar = kmalloc(sizeof(struct efivar_entry), GFP_KERNEL); | ||
619 | |||
620 | if (!short_name || !new_efivar) { | ||
621 | if (short_name) kfree(short_name); | ||
622 | if (new_efivar) kfree(new_efivar); | ||
623 | return 1; | ||
624 | } | ||
625 | memset(short_name, 0, short_name_size+1); | ||
626 | memset(new_efivar, 0, sizeof(struct efivar_entry)); | ||
627 | |||
628 | memcpy(new_efivar->var.VariableName, variable_name, | ||
629 | variable_name_size); | ||
630 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | ||
631 | |||
632 | /* Convert Unicode to normal chars (assume top bits are 0), | ||
633 | ala UTF-8 */ | ||
634 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | ||
635 | short_name[i] = variable_name[i] & 0xFF; | ||
636 | } | ||
637 | /* This is ugly, but necessary to separate one vendor's | ||
638 | private variables from another's. */ | ||
639 | |||
640 | *(short_name + strlen(short_name)) = '-'; | ||
641 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | ||
642 | |||
643 | kobject_set_name(&new_efivar->kobj, "%s", short_name); | ||
644 | kobj_set_kset_s(new_efivar, vars_subsys); | ||
645 | kobject_register(&new_efivar->kobj); | ||
646 | |||
647 | kfree(short_name); short_name = NULL; | ||
648 | |||
649 | spin_lock(&efivars_lock); | ||
650 | list_add(&new_efivar->list, &efivar_list); | ||
651 | spin_unlock(&efivars_lock); | ||
652 | |||
653 | return 0; | ||
654 | } | ||
655 | /* | ||
656 | * For now we register the efi subsystem with the firmware subsystem | ||
657 | * and the vars subsystem with the efi subsystem. In the future, it | ||
658 | * might make sense to split off the efi subsystem into its own | ||
659 | * driver, but for now only efivars will register with it, so just | ||
660 | * include it here. | ||
661 | */ | ||
662 | |||
663 | static int __init | ||
664 | efivars_init(void) | ||
665 | { | ||
666 | efi_status_t status = EFI_NOT_FOUND; | ||
667 | efi_guid_t vendor_guid; | ||
668 | efi_char16_t *variable_name; | ||
669 | struct subsys_attribute *attr; | ||
670 | unsigned long variable_name_size = 1024; | ||
671 | int i, error = 0; | ||
672 | |||
673 | if (!efi_enabled) | ||
674 | return -ENODEV; | ||
675 | |||
676 | variable_name = kmalloc(variable_name_size, GFP_KERNEL); | ||
677 | if (!variable_name) { | ||
678 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | ||
679 | return -ENOMEM; | ||
680 | } | ||
681 | |||
682 | memset(variable_name, 0, variable_name_size); | ||
683 | |||
684 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | ||
685 | EFIVARS_DATE); | ||
686 | |||
687 | /* | ||
688 | * For now we'll register the efi subsys within this driver | ||
689 | */ | ||
690 | |||
691 | error = firmware_register(&efi_subsys); | ||
692 | |||
693 | if (error) { | ||
694 | printk(KERN_ERR "efivars: Firmware registration failed with error %d.\n", error); | ||
695 | goto out_free; | ||
696 | } | ||
697 | |||
698 | kset_set_kset_s(&vars_subsys, efi_subsys); | ||
699 | |||
700 | error = subsystem_register(&vars_subsys); | ||
701 | |||
702 | if (error) { | ||
703 | printk(KERN_ERR "efivars: Subsystem registration failed with error %d.\n", error); | ||
704 | goto out_firmware_unregister; | ||
705 | } | ||
706 | |||
707 | /* | ||
708 | * Per EFI spec, the maximum storage allocated for both | ||
709 | * the variable name and variable data is 1024 bytes. | ||
710 | */ | ||
711 | |||
712 | do { | ||
713 | variable_name_size = 1024; | ||
714 | |||
715 | status = efi.get_next_variable(&variable_name_size, | ||
716 | variable_name, | ||
717 | &vendor_guid); | ||
718 | switch (status) { | ||
719 | case EFI_SUCCESS: | ||
720 | efivar_create_sysfs_entry(variable_name_size, | ||
721 | variable_name, | ||
722 | &vendor_guid); | ||
723 | break; | ||
724 | case EFI_NOT_FOUND: | ||
725 | break; | ||
726 | default: | ||
727 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | ||
728 | status); | ||
729 | status = EFI_NOT_FOUND; | ||
730 | break; | ||
731 | } | ||
732 | } while (status != EFI_NOT_FOUND); | ||
733 | |||
734 | /* | ||
735 | * Now add attributes to allow creation of new vars | ||
736 | * and deletion of existing ones... | ||
737 | */ | ||
738 | |||
739 | for (i = 0; (attr = var_subsys_attrs[i]) && !error; i++) { | ||
740 | if (attr->show && attr->store) | ||
741 | error = subsys_create_file(&vars_subsys, attr); | ||
742 | } | ||
743 | |||
744 | /* Don't forget the systab entry */ | ||
745 | |||
746 | for (i = 0; (attr = efi_subsys_attrs[i]) && !error; i++) { | ||
747 | if (attr->show) | ||
748 | error = subsys_create_file(&efi_subsys, attr); | ||
749 | } | ||
750 | |||
751 | if (error) | ||
752 | printk(KERN_ERR "efivars: Sysfs attribute export failed with error %d.\n", error); | ||
753 | else | ||
754 | goto out_free; | ||
755 | |||
756 | subsystem_unregister(&vars_subsys); | ||
757 | |||
758 | out_firmware_unregister: | ||
759 | firmware_unregister(&efi_subsys); | ||
760 | |||
761 | out_free: | ||
762 | kfree(variable_name); | ||
763 | |||
764 | return error; | ||
765 | } | ||
766 | |||
767 | static void __exit | ||
768 | efivars_exit(void) | ||
769 | { | ||
770 | struct list_head *pos, *n; | ||
771 | |||
772 | list_for_each_safe(pos, n, &efivar_list) | ||
773 | efivar_unregister(get_efivar_entry(pos)); | ||
774 | |||
775 | subsystem_unregister(&vars_subsys); | ||
776 | firmware_unregister(&efi_subsys); | ||
777 | } | ||
778 | |||
779 | module_init(efivars_init); | ||
780 | module_exit(efivars_exit); | ||
781 | |||