Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 68 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <linux/types.h> |
| 70 | #include <linux/errno.h> |
| 71 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 80 | #include <linux/slab.h> |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 81 | #include <linux/pstore.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 93 | #define DUMP_NAME_LEN 52 |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 113 | struct efivars *efivars; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | struct efi_variable var; |
| 115 | struct list_head list; |
| 116 | struct kobject kobj; |
| 117 | }; |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Mike Waychison | 7644c16 | 2011-07-21 16:58:00 -0400 | [diff] [blame] | 125 | #define PSTORE_EFI_ATTRIBUTES \ |
| 126 | (EFI_VARIABLE_NON_VOLATILE | \ |
| 127 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ |
| 128 | EFI_VARIABLE_RUNTIME_ACCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
| 131 | struct efivar_attribute efivar_attr_##_name = { \ |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 132 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | .show = _show, \ |
| 134 | .store = _store, \ |
| 135 | }; |
| 136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | /* Return the number of unicode characters in data */ |
| 150 | static unsigned long |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 151 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
| 153 | unsigned long length = 0; |
| 154 | |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 155 | while (*s++ != 0 && length < maxlength) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | length++; |
| 157 | return length; |
| 158 | } |
| 159 | |
Tony Luck | b728a5c | 2011-08-02 15:08:30 -0700 | [diff] [blame] | 160 | static inline unsigned long |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 161 | utf16_strlen(efi_char16_t *s) |
| 162 | { |
| 163 | return utf16_strnlen(s, ~0UL); |
| 164 | } |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 171 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | { |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 173 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Mike Waychison | 828aa1f | 2011-07-21 16:57:58 -0400 | [diff] [blame] | 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 | |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 194 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 195 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
| 196 | unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 197 | { |
| 198 | struct efi_generic_dev_path *node; |
| 199 | int offset = 0; |
| 200 | |
| 201 | node = (struct efi_generic_dev_path *)buffer; |
| 202 | |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 203 | if (len < sizeof(*node)) |
| 204 | return false; |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 205 | |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 206 | while (offset <= len - sizeof(*node) && |
| 207 | node->length >= sizeof(*node) && |
| 208 | node->length <= len - offset) { |
| 209 | offset += node->length; |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 210 | |
| 211 | if ((node->type == EFI_DEV_END_PATH || |
| 212 | node->type == EFI_DEV_END_PATH2) && |
| 213 | node->sub_type == EFI_DEV_END_ENTIRE) |
| 214 | return true; |
| 215 | |
| 216 | node = (struct efi_generic_dev_path *)(buffer + offset); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * If we're here then either node->length pointed past the end |
| 221 | * of the buffer or we reached the end of the buffer without |
| 222 | * finding a device path end node. |
| 223 | */ |
| 224 | return false; |
| 225 | } |
| 226 | |
| 227 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 228 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
| 229 | unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 230 | { |
| 231 | /* An array of 16-bit integers */ |
| 232 | if ((len % 2) != 0) |
| 233 | return false; |
| 234 | |
| 235 | return true; |
| 236 | } |
| 237 | |
| 238 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 239 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
| 240 | unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 241 | { |
| 242 | u16 filepathlength; |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 243 | int i, desclength = 0, namelen; |
| 244 | |
| 245 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 246 | |
| 247 | /* Either "Boot" or "Driver" followed by four digits of hex */ |
| 248 | for (i = match; i < match+4; i++) { |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 249 | if (var->VariableName[i] > 127 || |
| 250 | hex_to_bin(var->VariableName[i] & 0xff) < 0) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 251 | return true; |
| 252 | } |
| 253 | |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 254 | /* Reject it if there's 4 digits of hex and then further content */ |
| 255 | if (namelen > match + 4) |
| 256 | return false; |
| 257 | |
| 258 | /* A valid entry must be at least 8 bytes */ |
| 259 | if (len < 8) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 260 | return false; |
| 261 | |
| 262 | filepathlength = buffer[4] | buffer[5] << 8; |
| 263 | |
| 264 | /* |
| 265 | * There's no stored length for the description, so it has to be |
| 266 | * found by hand |
| 267 | */ |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 268 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 269 | |
| 270 | /* Each boot entry must have a descriptor */ |
| 271 | if (!desclength) |
| 272 | return false; |
| 273 | |
| 274 | /* |
| 275 | * If the sum of the length of the description, the claimed filepath |
| 276 | * length and the original header are greater than the length of the |
| 277 | * variable, it's malformed |
| 278 | */ |
| 279 | if ((desclength + filepathlength + 6) > len) |
| 280 | return false; |
| 281 | |
| 282 | /* |
| 283 | * And, finally, check the filepath |
| 284 | */ |
| 285 | return validate_device_path(var, match, buffer + desclength + 6, |
| 286 | filepathlength); |
| 287 | } |
| 288 | |
| 289 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 290 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
| 291 | unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 292 | { |
| 293 | /* A single 16-bit integer */ |
| 294 | if (len != 2) |
| 295 | return false; |
| 296 | |
| 297 | return true; |
| 298 | } |
| 299 | |
| 300 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 301 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
| 302 | unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 303 | { |
| 304 | int i; |
| 305 | |
| 306 | for (i = 0; i < len; i++) { |
| 307 | if (buffer[i] > 127) |
| 308 | return false; |
| 309 | |
| 310 | if (buffer[i] == 0) |
| 311 | return true; |
| 312 | } |
| 313 | |
| 314 | return false; |
| 315 | } |
| 316 | |
| 317 | struct variable_validate { |
| 318 | char *name; |
| 319 | bool (*validate)(struct efi_variable *var, int match, u8 *data, |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 320 | unsigned long len); |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 321 | }; |
| 322 | |
| 323 | static const struct variable_validate variable_validate[] = { |
| 324 | { "BootNext", validate_uint16 }, |
| 325 | { "BootOrder", validate_boot_order }, |
| 326 | { "DriverOrder", validate_boot_order }, |
| 327 | { "Boot*", validate_load_option }, |
| 328 | { "Driver*", validate_load_option }, |
| 329 | { "ConIn", validate_device_path }, |
| 330 | { "ConInDev", validate_device_path }, |
| 331 | { "ConOut", validate_device_path }, |
| 332 | { "ConOutDev", validate_device_path }, |
| 333 | { "ErrOut", validate_device_path }, |
| 334 | { "ErrOutDev", validate_device_path }, |
| 335 | { "Timeout", validate_uint16 }, |
| 336 | { "Lang", validate_ascii_string }, |
| 337 | { "PlatformLang", validate_ascii_string }, |
| 338 | { "", NULL }, |
| 339 | }; |
| 340 | |
| 341 | static bool |
Matthew Garrett | 54b3a4d | 2012-05-03 16:50:46 -0400 | [diff] [blame] | 342 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 343 | { |
| 344 | int i; |
| 345 | u16 *unicode_name = var->VariableName; |
| 346 | |
| 347 | for (i = 0; variable_validate[i].validate != NULL; i++) { |
| 348 | const char *name = variable_validate[i].name; |
| 349 | int match; |
| 350 | |
| 351 | for (match = 0; ; match++) { |
| 352 | char c = name[match]; |
| 353 | u16 u = unicode_name[match]; |
| 354 | |
| 355 | /* All special variables are plain ascii */ |
| 356 | if (u > 127) |
| 357 | return true; |
| 358 | |
| 359 | /* Wildcard in the matching name means we've matched */ |
| 360 | if (c == '*') |
| 361 | return variable_validate[i].validate(var, |
| 362 | match, data, len); |
| 363 | |
| 364 | /* Case sensitive match */ |
| 365 | if (c != u) |
| 366 | break; |
| 367 | |
| 368 | /* Reached the end of the string while matching */ |
| 369 | if (!c) |
| 370 | return variable_validate[i].validate(var, |
| 371 | match, data, len); |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | return true; |
| 376 | } |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | static efi_status_t |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 379 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
| 381 | efi_status_t status; |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | var->DataSize = 1024; |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 384 | status = efivars->ops->get_variable(var->VariableName, |
| 385 | &var->VendorGuid, |
| 386 | &var->Attributes, |
| 387 | &var->DataSize, |
| 388 | var->Data); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 389 | return status; |
| 390 | } |
| 391 | |
| 392 | static efi_status_t |
| 393 | get_var_data(struct efivars *efivars, struct efi_variable *var) |
| 394 | { |
| 395 | efi_status_t status; |
| 396 | |
| 397 | spin_lock(&efivars->lock); |
| 398 | status = get_var_data_locked(efivars, var); |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 399 | spin_unlock(&efivars->lock); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | if (status != EFI_SUCCESS) { |
| 402 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", |
| 403 | status); |
| 404 | } |
| 405 | return status; |
| 406 | } |
| 407 | |
| 408 | static ssize_t |
| 409 | efivar_guid_read(struct efivar_entry *entry, char *buf) |
| 410 | { |
| 411 | struct efi_variable *var = &entry->var; |
| 412 | char *str = buf; |
| 413 | |
| 414 | if (!entry || !buf) |
| 415 | return 0; |
| 416 | |
| 417 | efi_guid_unparse(&var->VendorGuid, str); |
| 418 | str += strlen(str); |
| 419 | str += sprintf(str, "\n"); |
| 420 | |
| 421 | return str - buf; |
| 422 | } |
| 423 | |
| 424 | static ssize_t |
| 425 | efivar_attr_read(struct efivar_entry *entry, char *buf) |
| 426 | { |
| 427 | struct efi_variable *var = &entry->var; |
| 428 | char *str = buf; |
| 429 | efi_status_t status; |
| 430 | |
| 431 | if (!entry || !buf) |
| 432 | return -EINVAL; |
| 433 | |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 434 | status = get_var_data(entry->efivars, var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (status != EFI_SUCCESS) |
| 436 | return -EIO; |
| 437 | |
| 438 | if (var->Attributes & 0x1) |
| 439 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
| 440 | if (var->Attributes & 0x2) |
| 441 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
| 442 | if (var->Attributes & 0x4) |
| 443 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
| 444 | return str - buf; |
| 445 | } |
| 446 | |
| 447 | static ssize_t |
| 448 | efivar_size_read(struct efivar_entry *entry, char *buf) |
| 449 | { |
| 450 | struct efi_variable *var = &entry->var; |
| 451 | char *str = buf; |
| 452 | efi_status_t status; |
| 453 | |
| 454 | if (!entry || !buf) |
| 455 | return -EINVAL; |
| 456 | |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 457 | status = get_var_data(entry->efivars, var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (status != EFI_SUCCESS) |
| 459 | return -EIO; |
| 460 | |
| 461 | str += sprintf(str, "0x%lx\n", var->DataSize); |
| 462 | return str - buf; |
| 463 | } |
| 464 | |
| 465 | static ssize_t |
| 466 | efivar_data_read(struct efivar_entry *entry, char *buf) |
| 467 | { |
| 468 | struct efi_variable *var = &entry->var; |
| 469 | efi_status_t status; |
| 470 | |
| 471 | if (!entry || !buf) |
| 472 | return -EINVAL; |
| 473 | |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 474 | status = get_var_data(entry->efivars, var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (status != EFI_SUCCESS) |
| 476 | return -EIO; |
| 477 | |
| 478 | memcpy(buf, var->Data, var->DataSize); |
| 479 | return var->DataSize; |
| 480 | } |
| 481 | /* |
| 482 | * We allow each variable to be edited via rewriting the |
| 483 | * entire efi variable structure. |
| 484 | */ |
| 485 | static ssize_t |
| 486 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) |
| 487 | { |
| 488 | struct efi_variable *new_var, *var = &entry->var; |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 489 | struct efivars *efivars = entry->efivars; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | efi_status_t status = EFI_NOT_FOUND; |
| 491 | |
| 492 | if (count != sizeof(struct efi_variable)) |
| 493 | return -EINVAL; |
| 494 | |
| 495 | new_var = (struct efi_variable *)buf; |
| 496 | /* |
| 497 | * If only updating the variable data, then the name |
| 498 | * and guid should remain the same |
| 499 | */ |
| 500 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || |
| 501 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { |
| 502 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); |
| 503 | return -EINVAL; |
| 504 | } |
| 505 | |
| 506 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ |
| 507 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); |
| 508 | return -EINVAL; |
| 509 | } |
| 510 | |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 511 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
| 512 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { |
| 513 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
| 514 | return -EINVAL; |
| 515 | } |
| 516 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 517 | spin_lock(&efivars->lock); |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 518 | status = efivars->ops->set_variable(new_var->VariableName, |
| 519 | &new_var->VendorGuid, |
| 520 | new_var->Attributes, |
| 521 | new_var->DataSize, |
| 522 | new_var->Data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 524 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | if (status != EFI_SUCCESS) { |
| 527 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
| 528 | status); |
| 529 | return -EIO; |
| 530 | } |
| 531 | |
| 532 | memcpy(&entry->var, new_var, count); |
| 533 | return count; |
| 534 | } |
| 535 | |
| 536 | static ssize_t |
| 537 | efivar_show_raw(struct efivar_entry *entry, char *buf) |
| 538 | { |
| 539 | struct efi_variable *var = &entry->var; |
| 540 | efi_status_t status; |
| 541 | |
| 542 | if (!entry || !buf) |
| 543 | return 0; |
| 544 | |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 545 | status = get_var_data(entry->efivars, var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | if (status != EFI_SUCCESS) |
| 547 | return -EIO; |
| 548 | |
| 549 | memcpy(buf, var, sizeof(*var)); |
| 550 | return sizeof(*var); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Generic read/write functions that call the specific functions of |
Justin P. Mattock | 70f23fd | 2011-05-10 10:16:21 +0200 | [diff] [blame] | 555 | * the attributes... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | */ |
| 557 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, |
| 558 | char *buf) |
| 559 | { |
| 560 | struct efivar_entry *var = to_efivar_entry(kobj); |
| 561 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 562 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | if (!capable(CAP_SYS_ADMIN)) |
| 565 | return -EACCES; |
| 566 | |
| 567 | if (efivar_attr->show) { |
| 568 | ret = efivar_attr->show(var, buf); |
| 569 | } |
| 570 | return ret; |
| 571 | } |
| 572 | |
| 573 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, |
| 574 | const char *buf, size_t count) |
| 575 | { |
| 576 | struct efivar_entry *var = to_efivar_entry(kobj); |
| 577 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 578 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | if (!capable(CAP_SYS_ADMIN)) |
| 581 | return -EACCES; |
| 582 | |
| 583 | if (efivar_attr->store) |
| 584 | ret = efivar_attr->store(var, buf, count); |
| 585 | |
| 586 | return ret; |
| 587 | } |
| 588 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 589 | static const struct sysfs_ops efivar_attr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | .show = efivar_attr_show, |
| 591 | .store = efivar_attr_store, |
| 592 | }; |
| 593 | |
| 594 | static void efivar_release(struct kobject *kobj) |
| 595 | { |
| 596 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | kfree(var); |
| 598 | } |
| 599 | |
| 600 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); |
| 601 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); |
| 602 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); |
| 603 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); |
| 604 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); |
| 605 | |
| 606 | static struct attribute *def_attrs[] = { |
| 607 | &efivar_attr_guid.attr, |
| 608 | &efivar_attr_size.attr, |
| 609 | &efivar_attr_attributes.attr, |
| 610 | &efivar_attr_data.attr, |
| 611 | &efivar_attr_raw_var.attr, |
| 612 | NULL, |
| 613 | }; |
| 614 | |
Greg Kroah-Hartman | e89a411 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 615 | static struct kobj_type efivar_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | .release = efivar_release, |
| 617 | .sysfs_ops = &efivar_attr_ops, |
| 618 | .default_attrs = def_attrs, |
| 619 | }; |
| 620 | |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 621 | static struct pstore_info efi_pstore_info; |
| 622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | static inline void |
| 624 | efivar_unregister(struct efivar_entry *var) |
| 625 | { |
Greg Kroah-Hartman | c10997f | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 626 | kobject_put(&var->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 629 | #ifdef CONFIG_PSTORE |
| 630 | |
| 631 | static int efi_pstore_open(struct pstore_info *psi) |
| 632 | { |
| 633 | struct efivars *efivars = psi->data; |
| 634 | |
| 635 | spin_lock(&efivars->lock); |
| 636 | efivars->walk_entry = list_first_entry(&efivars->list, |
| 637 | struct efivar_entry, list); |
| 638 | return 0; |
| 639 | } |
| 640 | |
| 641 | static int efi_pstore_close(struct pstore_info *psi) |
| 642 | { |
| 643 | struct efivars *efivars = psi->data; |
| 644 | |
| 645 | spin_unlock(&efivars->lock); |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
Kees Cook | f6f8285 | 2011-11-17 12:58:07 -0800 | [diff] [blame] | 650 | struct timespec *timespec, |
| 651 | char **buf, struct pstore_info *psi) |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 652 | { |
| 653 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
| 654 | struct efivars *efivars = psi->data; |
| 655 | char name[DUMP_NAME_LEN]; |
| 656 | int i; |
| 657 | unsigned int part, size; |
| 658 | unsigned long time; |
| 659 | |
| 660 | while (&efivars->walk_entry->list != &efivars->list) { |
| 661 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, |
| 662 | vendor)) { |
| 663 | for (i = 0; i < DUMP_NAME_LEN; i++) { |
| 664 | name[i] = efivars->walk_entry->var.VariableName[i]; |
| 665 | } |
| 666 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { |
| 667 | *id = part; |
| 668 | timespec->tv_sec = time; |
| 669 | timespec->tv_nsec = 0; |
| 670 | get_var_data_locked(efivars, &efivars->walk_entry->var); |
| 671 | size = efivars->walk_entry->var.DataSize; |
Kees Cook | f6f8285 | 2011-11-17 12:58:07 -0800 | [diff] [blame] | 672 | *buf = kmalloc(size, GFP_KERNEL); |
| 673 | if (*buf == NULL) |
| 674 | return -ENOMEM; |
| 675 | memcpy(*buf, efivars->walk_entry->var.Data, |
| 676 | size); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 677 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
| 678 | struct efivar_entry, list); |
| 679 | return size; |
| 680 | } |
| 681 | } |
| 682 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
| 683 | struct efivar_entry, list); |
| 684 | } |
| 685 | return 0; |
| 686 | } |
| 687 | |
Kees Cook | 3d6d8d2 | 2011-11-17 13:13:29 -0800 | [diff] [blame] | 688 | static int efi_pstore_write(enum pstore_type_id type, |
| 689 | enum kmsg_dump_reason reason, u64 *id, |
Chen Gong | b238b8f | 2011-10-12 09:17:24 -0700 | [diff] [blame] | 690 | unsigned int part, size_t size, struct pstore_info *psi) |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 691 | { |
| 692 | char name[DUMP_NAME_LEN]; |
| 693 | char stub_name[DUMP_NAME_LEN]; |
| 694 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
| 695 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
| 696 | struct efivars *efivars = psi->data; |
| 697 | struct efivar_entry *entry, *found = NULL; |
Chen Gong | b238b8f | 2011-10-12 09:17:24 -0700 | [diff] [blame] | 698 | int i, ret = 0; |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 699 | |
| 700 | sprintf(stub_name, "dump-type%u-%u-", type, part); |
| 701 | sprintf(name, "%s%lu", stub_name, get_seconds()); |
| 702 | |
| 703 | spin_lock(&efivars->lock); |
| 704 | |
| 705 | for (i = 0; i < DUMP_NAME_LEN; i++) |
| 706 | efi_name[i] = stub_name[i]; |
| 707 | |
| 708 | /* |
| 709 | * Clean up any entries with the same name |
| 710 | */ |
| 711 | |
| 712 | list_for_each_entry(entry, &efivars->list, list) { |
| 713 | get_var_data_locked(efivars, &entry->var); |
| 714 | |
Mike Waychison | c475594 | 2011-07-21 16:57:59 -0400 | [diff] [blame] | 715 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
| 716 | continue; |
| 717 | if (utf16_strncmp(entry->var.VariableName, efi_name, |
| 718 | utf16_strlen(efi_name))) |
| 719 | continue; |
| 720 | /* Needs to be a prefix */ |
| 721 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) |
| 722 | continue; |
| 723 | |
| 724 | /* found */ |
| 725 | found = entry; |
Mike Waychison | 7644c16 | 2011-07-21 16:58:00 -0400 | [diff] [blame] | 726 | efivars->ops->set_variable(entry->var.VariableName, |
| 727 | &entry->var.VendorGuid, |
| 728 | PSTORE_EFI_ATTRIBUTES, |
Mike Waychison | c475594 | 2011-07-21 16:57:59 -0400 | [diff] [blame] | 729 | 0, NULL); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | if (found) |
| 733 | list_del(&found->list); |
| 734 | |
| 735 | for (i = 0; i < DUMP_NAME_LEN; i++) |
| 736 | efi_name[i] = name[i]; |
| 737 | |
Mike Waychison | 7644c16 | 2011-07-21 16:58:00 -0400 | [diff] [blame] | 738 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 739 | size, psi->buf); |
| 740 | |
| 741 | spin_unlock(&efivars->lock); |
| 742 | |
| 743 | if (found) |
| 744 | efivar_unregister(found); |
| 745 | |
| 746 | if (size) |
Chen Gong | b238b8f | 2011-10-12 09:17:24 -0700 | [diff] [blame] | 747 | ret = efivar_create_sysfs_entry(efivars, |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 748 | utf16_strsize(efi_name, |
| 749 | DUMP_NAME_LEN * 2), |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 750 | efi_name, &vendor); |
| 751 | |
Chen Gong | b238b8f | 2011-10-12 09:17:24 -0700 | [diff] [blame] | 752 | *id = part; |
| 753 | return ret; |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 754 | }; |
| 755 | |
| 756 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, |
| 757 | struct pstore_info *psi) |
| 758 | { |
Kees Cook | 3d6d8d2 | 2011-11-17 13:13:29 -0800 | [diff] [blame] | 759 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 760 | |
| 761 | return 0; |
| 762 | } |
| 763 | #else |
| 764 | static int efi_pstore_open(struct pstore_info *psi) |
| 765 | { |
| 766 | return 0; |
| 767 | } |
| 768 | |
| 769 | static int efi_pstore_close(struct pstore_info *psi) |
| 770 | { |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
Christoph Fritz | eee628d | 2011-11-28 23:49:33 +0100 | [diff] [blame] | 775 | struct timespec *timespec, |
| 776 | char **buf, struct pstore_info *psi) |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 777 | { |
| 778 | return -1; |
| 779 | } |
| 780 | |
Kees Cook | 3d6d8d2 | 2011-11-17 13:13:29 -0800 | [diff] [blame] | 781 | static int efi_pstore_write(enum pstore_type_id type, |
| 782 | enum kmsg_dump_reason reason, u64 *id, |
Chen Gong | b238b8f | 2011-10-12 09:17:24 -0700 | [diff] [blame] | 783 | unsigned int part, size_t size, struct pstore_info *psi) |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 784 | { |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, |
| 789 | struct pstore_info *psi) |
| 790 | { |
| 791 | return 0; |
| 792 | } |
| 793 | #endif |
| 794 | |
| 795 | static struct pstore_info efi_pstore_info = { |
| 796 | .owner = THIS_MODULE, |
| 797 | .name = "efi", |
| 798 | .open = efi_pstore_open, |
| 799 | .close = efi_pstore_close, |
| 800 | .read = efi_pstore_read, |
| 801 | .write = efi_pstore_write, |
| 802 | .erase = efi_pstore_erase, |
| 803 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 805 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
Greg Kroah-Hartman | 97fa5bb | 2007-11-07 13:56:19 -0800 | [diff] [blame] | 806 | struct bin_attribute *bin_attr, |
| 807 | char *buf, loff_t pos, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | { |
| 809 | struct efi_variable *new_var = (struct efi_variable *)buf; |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 810 | struct efivars *efivars = bin_attr->private; |
Matt Domsch | 496a0fc | 2007-01-26 00:57:18 -0800 | [diff] [blame] | 811 | struct efivar_entry *search_efivar, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | unsigned long strsize1, strsize2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | efi_status_t status = EFI_NOT_FOUND; |
| 814 | int found = 0; |
| 815 | |
| 816 | if (!capable(CAP_SYS_ADMIN)) |
| 817 | return -EACCES; |
| 818 | |
Matthew Garrett | fec6c20 | 2012-04-30 16:11:30 -0400 | [diff] [blame] | 819 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
| 820 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { |
| 821 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
| 822 | return -EINVAL; |
| 823 | } |
| 824 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 825 | spin_lock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
| 827 | /* |
| 828 | * Does this variable already exist? |
| 829 | */ |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 830 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 831 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
| 832 | strsize2 = utf16_strsize(new_var->VariableName, 1024); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | if (strsize1 == strsize2 && |
| 834 | !memcmp(&(search_efivar->var.VariableName), |
| 835 | new_var->VariableName, strsize1) && |
| 836 | !efi_guidcmp(search_efivar->var.VendorGuid, |
| 837 | new_var->VendorGuid)) { |
| 838 | found = 1; |
| 839 | break; |
| 840 | } |
| 841 | } |
| 842 | if (found) { |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 843 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | return -EINVAL; |
| 845 | } |
| 846 | |
| 847 | /* now *really* create the variable via EFI */ |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 848 | status = efivars->ops->set_variable(new_var->VariableName, |
| 849 | &new_var->VendorGuid, |
| 850 | new_var->Attributes, |
| 851 | new_var->DataSize, |
| 852 | new_var->Data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
| 854 | if (status != EFI_SUCCESS) { |
| 855 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
| 856 | status); |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 857 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | return -EIO; |
| 859 | } |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 860 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | /* Create the entry in sysfs. Locking is not required here */ |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 863 | status = efivar_create_sysfs_entry(efivars, |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 864 | utf16_strsize(new_var->VariableName, |
| 865 | 1024), |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 866 | new_var->VariableName, |
| 867 | &new_var->VendorGuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | if (status) { |
| 869 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); |
| 870 | } |
| 871 | return count; |
| 872 | } |
| 873 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 874 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
Greg Kroah-Hartman | 97fa5bb | 2007-11-07 13:56:19 -0800 | [diff] [blame] | 875 | struct bin_attribute *bin_attr, |
| 876 | char *buf, loff_t pos, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | { |
| 878 | struct efi_variable *del_var = (struct efi_variable *)buf; |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 879 | struct efivars *efivars = bin_attr->private; |
Matt Domsch | 496a0fc | 2007-01-26 00:57:18 -0800 | [diff] [blame] | 880 | struct efivar_entry *search_efivar, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | unsigned long strsize1, strsize2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | efi_status_t status = EFI_NOT_FOUND; |
| 883 | int found = 0; |
| 884 | |
| 885 | if (!capable(CAP_SYS_ADMIN)) |
| 886 | return -EACCES; |
| 887 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 888 | spin_lock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
| 890 | /* |
| 891 | * Does this variable already exist? |
| 892 | */ |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 893 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
Mike Waychison | a294090 | 2011-07-21 16:57:57 -0400 | [diff] [blame] | 894 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
| 895 | strsize2 = utf16_strsize(del_var->VariableName, 1024); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | if (strsize1 == strsize2 && |
| 897 | !memcmp(&(search_efivar->var.VariableName), |
| 898 | del_var->VariableName, strsize1) && |
| 899 | !efi_guidcmp(search_efivar->var.VendorGuid, |
| 900 | del_var->VendorGuid)) { |
| 901 | found = 1; |
| 902 | break; |
| 903 | } |
| 904 | } |
| 905 | if (!found) { |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 906 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | return -EINVAL; |
| 908 | } |
| 909 | /* force the Attributes/DataSize to 0 to ensure deletion */ |
| 910 | del_var->Attributes = 0; |
| 911 | del_var->DataSize = 0; |
| 912 | |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 913 | status = efivars->ops->set_variable(del_var->VariableName, |
| 914 | &del_var->VendorGuid, |
| 915 | del_var->Attributes, |
| 916 | del_var->DataSize, |
| 917 | del_var->Data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | if (status != EFI_SUCCESS) { |
| 920 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
| 921 | status); |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 922 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | return -EIO; |
| 924 | } |
Matt Domsch | 496a0fc | 2007-01-26 00:57:18 -0800 | [diff] [blame] | 925 | list_del(&search_efivar->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | /* We need to release this lock before unregistering. */ |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 927 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | efivar_unregister(search_efivar); |
| 929 | |
| 930 | /* It's dead Jim.... */ |
| 931 | return count; |
| 932 | } |
| 933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | /* |
| 935 | * Let's not leave out systab information that snuck into |
| 936 | * the efivars driver |
| 937 | */ |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 938 | static ssize_t systab_show(struct kobject *kobj, |
| 939 | struct kobj_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | { |
| 941 | char *str = buf; |
| 942 | |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 943 | if (!kobj || !buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | return -EINVAL; |
| 945 | |
Bjorn Helgaas | b2c99e3 | 2006-03-26 01:37:08 -0800 | [diff] [blame] | 946 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
| 947 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); |
| 948 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) |
| 949 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); |
| 950 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) |
| 951 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); |
| 952 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) |
| 953 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); |
| 954 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) |
| 955 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); |
| 956 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) |
| 957 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); |
| 958 | if (efi.uga != EFI_INVALID_TABLE_ADDR) |
| 959 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
| 961 | return str - buf; |
| 962 | } |
| 963 | |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 964 | static struct kobj_attribute efi_attr_systab = |
| 965 | __ATTR(systab, 0400, systab_show, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 967 | static struct attribute *efi_subsys_attrs[] = { |
| 968 | &efi_attr_systab.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | NULL, /* maybe more in the future? */ |
| 970 | }; |
| 971 | |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 972 | static struct attribute_group efi_subsys_attr_group = { |
| 973 | .attrs = efi_subsys_attrs, |
| 974 | }; |
| 975 | |
Greg Kroah-Hartman | bc87d2f | 2007-11-07 13:56:19 -0800 | [diff] [blame] | 976 | static struct kobject *efi_kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
| 978 | /* |
| 979 | * efivar_create_sysfs_entry() |
| 980 | * Requires: |
| 981 | * variable_name_size = number of bytes required to hold |
| 982 | * variable_name (not counting the NULL |
| 983 | * character at the end. |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 984 | * efivars->lock is not held on entry or exit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | * Returns 1 on failure, 0 on success |
| 986 | */ |
| 987 | static int |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 988 | efivar_create_sysfs_entry(struct efivars *efivars, |
| 989 | unsigned long variable_name_size, |
| 990 | efi_char16_t *variable_name, |
| 991 | efi_guid_t *vendor_guid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | { |
| 993 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; |
| 994 | char *short_name; |
| 995 | struct efivar_entry *new_efivar; |
| 996 | |
Deepak Saxena | 9c21538 | 2005-11-07 01:01:24 -0800 | [diff] [blame] | 997 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
| 998 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | if (!short_name || !new_efivar) { |
Jesper Juhl | 0933ad9 | 2005-06-25 14:59:15 -0700 | [diff] [blame] | 1001 | kfree(short_name); |
| 1002 | kfree(new_efivar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | return 1; |
| 1004 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 1006 | new_efivar->efivars = efivars; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | memcpy(new_efivar->var.VariableName, variable_name, |
| 1008 | variable_name_size); |
| 1009 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); |
| 1010 | |
| 1011 | /* Convert Unicode to normal chars (assume top bits are 0), |
| 1012 | ala UTF-8 */ |
| 1013 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { |
| 1014 | short_name[i] = variable_name[i] & 0xFF; |
| 1015 | } |
| 1016 | /* This is ugly, but necessary to separate one vendor's |
| 1017 | private variables from another's. */ |
| 1018 | |
| 1019 | *(short_name + strlen(short_name)) = '-'; |
| 1020 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); |
| 1021 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 1022 | new_efivar->kobj.kset = efivars->kset; |
Greg Kroah-Hartman | d6d292c | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 1023 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
| 1024 | "%s", short_name); |
Jeff Garzik | 69b2186 | 2006-10-11 01:22:23 -0700 | [diff] [blame] | 1025 | if (i) { |
| 1026 | kfree(short_name); |
| 1027 | kfree(new_efivar); |
| 1028 | return 1; |
| 1029 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Greg Kroah-Hartman | d6d292c | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 1031 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
Jesper Juhl | 0933ad9 | 2005-06-25 14:59:15 -0700 | [diff] [blame] | 1032 | kfree(short_name); |
| 1033 | short_name = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 1035 | spin_lock(&efivars->lock); |
| 1036 | list_add(&new_efivar->list, &efivars->list); |
| 1037 | spin_unlock(&efivars->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | return 0; |
| 1040 | } |
Mike Waychison | d502fbb | 2011-03-11 17:43:06 -0800 | [diff] [blame] | 1041 | |
| 1042 | static int |
| 1043 | create_efivars_bin_attributes(struct efivars *efivars) |
| 1044 | { |
| 1045 | struct bin_attribute *attr; |
| 1046 | int error; |
| 1047 | |
| 1048 | /* new_var */ |
| 1049 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| 1050 | if (!attr) |
| 1051 | return -ENOMEM; |
| 1052 | |
| 1053 | attr->attr.name = "new_var"; |
| 1054 | attr->attr.mode = 0200; |
| 1055 | attr->write = efivar_create; |
| 1056 | attr->private = efivars; |
| 1057 | efivars->new_var = attr; |
| 1058 | |
| 1059 | /* del_var */ |
| 1060 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| 1061 | if (!attr) { |
| 1062 | error = -ENOMEM; |
| 1063 | goto out_free; |
| 1064 | } |
| 1065 | attr->attr.name = "del_var"; |
| 1066 | attr->attr.mode = 0200; |
| 1067 | attr->write = efivar_delete; |
| 1068 | attr->private = efivars; |
| 1069 | efivars->del_var = attr; |
| 1070 | |
| 1071 | sysfs_bin_attr_init(efivars->new_var); |
| 1072 | sysfs_bin_attr_init(efivars->del_var); |
| 1073 | |
| 1074 | /* Register */ |
| 1075 | error = sysfs_create_bin_file(&efivars->kset->kobj, |
| 1076 | efivars->new_var); |
| 1077 | if (error) { |
| 1078 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" |
| 1079 | " due to error %d\n", error); |
| 1080 | goto out_free; |
| 1081 | } |
| 1082 | error = sysfs_create_bin_file(&efivars->kset->kobj, |
| 1083 | efivars->del_var); |
| 1084 | if (error) { |
| 1085 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" |
| 1086 | " due to error %d\n", error); |
| 1087 | sysfs_remove_bin_file(&efivars->kset->kobj, |
| 1088 | efivars->new_var); |
| 1089 | goto out_free; |
| 1090 | } |
| 1091 | |
| 1092 | return 0; |
| 1093 | out_free: |
Dan Carpenter | 051d51b | 2011-03-18 10:12:14 +0300 | [diff] [blame] | 1094 | kfree(efivars->del_var); |
| 1095 | efivars->del_var = NULL; |
Mike Waychison | d502fbb | 2011-03-11 17:43:06 -0800 | [diff] [blame] | 1096 | kfree(efivars->new_var); |
| 1097 | efivars->new_var = NULL; |
| 1098 | return error; |
| 1099 | } |
| 1100 | |
Mike Waychison | 4fc756b | 2011-03-11 17:43:27 -0800 | [diff] [blame] | 1101 | void unregister_efivars(struct efivars *efivars) |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1102 | { |
| 1103 | struct efivar_entry *entry, *n; |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 1104 | |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1105 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
| 1106 | spin_lock(&efivars->lock); |
| 1107 | list_del(&entry->list); |
| 1108 | spin_unlock(&efivars->lock); |
| 1109 | efivar_unregister(entry); |
| 1110 | } |
| 1111 | if (efivars->new_var) |
| 1112 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); |
| 1113 | if (efivars->del_var) |
| 1114 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); |
| 1115 | kfree(efivars->new_var); |
| 1116 | kfree(efivars->del_var); |
| 1117 | kset_unregister(efivars->kset); |
| 1118 | } |
Mike Waychison | 4fc756b | 2011-03-11 17:43:27 -0800 | [diff] [blame] | 1119 | EXPORT_SYMBOL_GPL(unregister_efivars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
Mike Waychison | 4fc756b | 2011-03-11 17:43:27 -0800 | [diff] [blame] | 1121 | int register_efivars(struct efivars *efivars, |
| 1122 | const struct efivar_operations *ops, |
| 1123 | struct kobject *parent_kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | { |
| 1125 | efi_status_t status = EFI_NOT_FOUND; |
| 1126 | efi_guid_t vendor_guid; |
| 1127 | efi_char16_t *variable_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | unsigned long variable_name_size = 1024; |
Greg Kroah-Hartman | 334c630 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 1129 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Deepak Saxena | 9c21538 | 2005-11-07 01:01:24 -0800 | [diff] [blame] | 1131 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | if (!variable_name) { |
| 1133 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); |
| 1134 | return -ENOMEM; |
| 1135 | } |
| 1136 | |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 1137 | spin_lock_init(&efivars->lock); |
| 1138 | INIT_LIST_HEAD(&efivars->list); |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 1139 | efivars->ops = ops; |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 1140 | |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1141 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
Mike Waychison | 2942269 | 2011-03-11 17:43:00 -0800 | [diff] [blame] | 1142 | if (!efivars->kset) { |
Greg Kroah-Hartman | 66ac831 | 2007-11-02 13:20:40 -0700 | [diff] [blame] | 1143 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
| 1144 | error = -ENOMEM; |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1145 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | /* |
| 1149 | * Per EFI spec, the maximum storage allocated for both |
| 1150 | * the variable name and variable data is 1024 bytes. |
| 1151 | */ |
| 1152 | |
| 1153 | do { |
| 1154 | variable_name_size = 1024; |
| 1155 | |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 1156 | status = ops->get_next_variable(&variable_name_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | variable_name, |
| 1158 | &vendor_guid); |
| 1159 | switch (status) { |
| 1160 | case EFI_SUCCESS: |
Mike Waychison | 4142ef1 | 2011-03-11 17:43:11 -0800 | [diff] [blame] | 1161 | efivar_create_sysfs_entry(efivars, |
| 1162 | variable_name_size, |
| 1163 | variable_name, |
| 1164 | &vendor_guid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | break; |
| 1166 | case EFI_NOT_FOUND: |
| 1167 | break; |
| 1168 | default: |
| 1169 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", |
| 1170 | status); |
| 1171 | status = EFI_NOT_FOUND; |
| 1172 | break; |
| 1173 | } |
| 1174 | } while (status != EFI_NOT_FOUND); |
| 1175 | |
Mike Waychison | d502fbb | 2011-03-11 17:43:06 -0800 | [diff] [blame] | 1176 | error = create_efivars_bin_attributes(efivars); |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1177 | if (error) |
| 1178 | unregister_efivars(efivars); |
| 1179 | |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 1180 | efivars->efi_pstore_info = efi_pstore_info; |
| 1181 | |
| 1182 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); |
| 1183 | if (efivars->efi_pstore_info.buf) { |
| 1184 | efivars->efi_pstore_info.bufsize = 1024; |
| 1185 | efivars->efi_pstore_info.data = efivars; |
Don Zickus | abd4d55 | 2011-08-12 10:54:51 -0700 | [diff] [blame] | 1186 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
Matthew Garrett | 5ee9c19 | 2011-07-21 16:57:56 -0400 | [diff] [blame] | 1187 | pstore_register(&efivars->efi_pstore_info); |
| 1188 | } |
| 1189 | |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1190 | out: |
| 1191 | kfree(variable_name); |
| 1192 | |
| 1193 | return error; |
| 1194 | } |
Mike Waychison | 4fc756b | 2011-03-11 17:43:27 -0800 | [diff] [blame] | 1195 | EXPORT_SYMBOL_GPL(register_efivars); |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1196 | |
| 1197 | static struct efivars __efivars; |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 1198 | static struct efivar_operations ops; |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1199 | |
| 1200 | /* |
| 1201 | * For now we register the efi subsystem with the firmware subsystem |
| 1202 | * and the vars subsystem with the efi subsystem. In the future, it |
| 1203 | * might make sense to split off the efi subsystem into its own |
| 1204 | * driver, but for now only efivars will register with it, so just |
| 1205 | * include it here. |
| 1206 | */ |
| 1207 | |
| 1208 | static int __init |
| 1209 | efivars_init(void) |
| 1210 | { |
| 1211 | int error = 0; |
| 1212 | |
| 1213 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, |
| 1214 | EFIVARS_DATE); |
| 1215 | |
| 1216 | if (!efi_enabled) |
Mike Waychison | 4fc756b | 2011-03-11 17:43:27 -0800 | [diff] [blame] | 1217 | return 0; |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1218 | |
| 1219 | /* For now we'll register the efi directory at /sys/firmware/efi */ |
| 1220 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); |
| 1221 | if (!efi_kobj) { |
| 1222 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); |
| 1223 | return -ENOMEM; |
| 1224 | } |
| 1225 | |
Mike Waychison | 3295814 | 2011-03-11 17:43:21 -0800 | [diff] [blame] | 1226 | ops.get_variable = efi.get_variable; |
| 1227 | ops.set_variable = efi.set_variable; |
| 1228 | ops.get_next_variable = efi.get_next_variable; |
| 1229 | error = register_efivars(&__efivars, &ops, efi_kobj); |
Dan Carpenter | 3116aab | 2011-03-18 10:12:38 +0300 | [diff] [blame] | 1230 | if (error) |
| 1231 | goto err_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | /* Don't forget the systab entry */ |
Greg Kroah-Hartman | bc87d2f | 2007-11-07 13:56:19 -0800 | [diff] [blame] | 1234 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1235 | if (error) { |
| 1236 | printk(KERN_ERR |
| 1237 | "efivars: Sysfs attribute export failed with error %d.\n", |
| 1238 | error); |
Dan Carpenter | 3116aab | 2011-03-18 10:12:38 +0300 | [diff] [blame] | 1239 | goto err_unregister; |
Mike Waychison | 76b53f7c | 2011-03-11 17:43:16 -0800 | [diff] [blame] | 1240 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
Dan Carpenter | 3116aab | 2011-03-18 10:12:38 +0300 | [diff] [blame] | 1242 | return 0; |
| 1243 | |
| 1244 | err_unregister: |
| 1245 | unregister_efivars(&__efivars); |
| 1246 | err_put: |
| 1247 | kobject_put(efi_kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | return error; |
| 1249 | } |
| 1250 | |
| 1251 | static void __exit |
| 1252 | efivars_exit(void) |
| 1253 | { |
Randy Dunlap | aabb6e1 | 2011-05-06 13:27:41 -0700 | [diff] [blame] | 1254 | if (efi_enabled) { |
| 1255 | unregister_efivars(&__efivars); |
| 1256 | kobject_put(efi_kobj); |
| 1257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | } |
| 1259 | |
| 1260 | module_init(efivars_init); |
| 1261 | module_exit(efivars_exit); |
| 1262 | |