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Commit | Line | Data |
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1da177e4 LT |
1 | /* Helpers for initial module or kernel cmdline parsing |
2 | Copyright (C) 2001 Rusty Russell. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/err.h> | |
4e57b681 | 24 | #include <linux/slab.h> |
26d052bf | 25 | #include <linux/ctype.h> |
1da177e4 | 26 | |
907b29eb RR |
27 | /* Protects all parameters, and incidentally kmalloced_param list. */ |
28 | static DEFINE_MUTEX(param_lock); | |
29 | ||
a1054322 RR |
30 | /* This just allows us to keep track of which parameters are kmalloced. */ |
31 | struct kmalloced_param { | |
32 | struct list_head list; | |
33 | char val[]; | |
34 | }; | |
a1054322 RR |
35 | static LIST_HEAD(kmalloced_params); |
36 | ||
37 | static void *kmalloc_parameter(unsigned int size) | |
38 | { | |
39 | struct kmalloced_param *p; | |
40 | ||
41 | p = kmalloc(sizeof(*p) + size, GFP_KERNEL); | |
42 | if (!p) | |
43 | return NULL; | |
44 | ||
a1054322 | 45 | list_add(&p->list, &kmalloced_params); |
a1054322 RR |
46 | return p->val; |
47 | } | |
48 | ||
49 | /* Does nothing if parameter wasn't kmalloced above. */ | |
50 | static void maybe_kfree_parameter(void *param) | |
51 | { | |
52 | struct kmalloced_param *p; | |
53 | ||
a1054322 RR |
54 | list_for_each_entry(p, &kmalloced_params, list) { |
55 | if (p->val == param) { | |
56 | list_del(&p->list); | |
57 | kfree(p); | |
58 | break; | |
59 | } | |
60 | } | |
a1054322 RR |
61 | } |
62 | ||
b1e4d20c | 63 | static char dash2underscore(char c) |
1da177e4 LT |
64 | { |
65 | if (c == '-') | |
66 | return '_'; | |
67 | return c; | |
68 | } | |
69 | ||
b1e4d20c | 70 | bool parameqn(const char *a, const char *b, size_t n) |
1da177e4 | 71 | { |
b1e4d20c MS |
72 | size_t i; |
73 | ||
74 | for (i = 0; i < n; i++) { | |
75 | if (dash2underscore(a[i]) != dash2underscore(b[i])) | |
76 | return false; | |
77 | } | |
78 | return true; | |
79 | } | |
80 | ||
81 | bool parameq(const char *a, const char *b) | |
82 | { | |
83 | return parameqn(a, b, strlen(a)+1); | |
1da177e4 LT |
84 | } |
85 | ||
86 | static int parse_one(char *param, | |
87 | char *val, | |
9fb48c74 | 88 | const char *doing, |
914dcaa8 | 89 | const struct kernel_param *params, |
1da177e4 | 90 | unsigned num_params, |
026cee00 PM |
91 | s16 min_level, |
92 | s16 max_level, | |
9fb48c74 JC |
93 | int (*handle_unknown)(char *param, char *val, |
94 | const char *doing)) | |
1da177e4 LT |
95 | { |
96 | unsigned int i; | |
907b29eb | 97 | int err; |
1da177e4 LT |
98 | |
99 | /* Find parameter */ | |
100 | for (i = 0; i < num_params; i++) { | |
101 | if (parameq(param, params[i].name)) { | |
026cee00 PM |
102 | if (params[i].level < min_level |
103 | || params[i].level > max_level) | |
104 | return 0; | |
25985edc | 105 | /* No one handled NULL, so do it here. */ |
10f296cb DY |
106 | if (!val && params[i].ops->set != param_set_bool |
107 | && params[i].ops->set != param_set_bint) | |
2e9fb995 | 108 | return -EINVAL; |
9fb48c74 JC |
109 | pr_debug("handling %s with %p\n", param, |
110 | params[i].ops->set); | |
907b29eb RR |
111 | mutex_lock(¶m_lock); |
112 | err = params[i].ops->set(val, ¶ms[i]); | |
113 | mutex_unlock(¶m_lock); | |
114 | return err; | |
1da177e4 LT |
115 | } |
116 | } | |
117 | ||
118 | if (handle_unknown) { | |
9fb48c74 JC |
119 | pr_debug("doing %s: %s='%s'\n", doing, param, val); |
120 | return handle_unknown(param, val, doing); | |
1da177e4 LT |
121 | } |
122 | ||
9fb48c74 | 123 | pr_debug("Unknown argument '%s'\n", param); |
1da177e4 LT |
124 | return -ENOENT; |
125 | } | |
126 | ||
127 | /* You can use " around spaces, but can't escape ". */ | |
128 | /* Hyphens and underscores equivalent in parameter names. */ | |
129 | static char *next_arg(char *args, char **param, char **val) | |
130 | { | |
131 | unsigned int i, equals = 0; | |
132 | int in_quote = 0, quoted = 0; | |
133 | char *next; | |
134 | ||
1da177e4 LT |
135 | if (*args == '"') { |
136 | args++; | |
137 | in_quote = 1; | |
138 | quoted = 1; | |
139 | } | |
140 | ||
141 | for (i = 0; args[i]; i++) { | |
26d052bf | 142 | if (isspace(args[i]) && !in_quote) |
1da177e4 LT |
143 | break; |
144 | if (equals == 0) { | |
145 | if (args[i] == '=') | |
146 | equals = i; | |
147 | } | |
148 | if (args[i] == '"') | |
149 | in_quote = !in_quote; | |
150 | } | |
151 | ||
152 | *param = args; | |
153 | if (!equals) | |
154 | *val = NULL; | |
155 | else { | |
156 | args[equals] = '\0'; | |
157 | *val = args + equals + 1; | |
158 | ||
159 | /* Don't include quotes in value. */ | |
160 | if (**val == '"') { | |
161 | (*val)++; | |
162 | if (args[i-1] == '"') | |
163 | args[i-1] = '\0'; | |
164 | } | |
165 | if (quoted && args[i-1] == '"') | |
166 | args[i-1] = '\0'; | |
167 | } | |
168 | ||
169 | if (args[i]) { | |
170 | args[i] = '\0'; | |
171 | next = args + i + 1; | |
172 | } else | |
173 | next = args + i; | |
f36462f0 RR |
174 | |
175 | /* Chew up trailing spaces. */ | |
e7d2860b | 176 | return skip_spaces(next); |
1da177e4 LT |
177 | } |
178 | ||
179 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
9fb48c74 | 180 | int parse_args(const char *doing, |
1da177e4 | 181 | char *args, |
914dcaa8 | 182 | const struct kernel_param *params, |
1da177e4 | 183 | unsigned num, |
026cee00 PM |
184 | s16 min_level, |
185 | s16 max_level, | |
9fb48c74 | 186 | int (*unknown)(char *param, char *val, const char *doing)) |
1da177e4 LT |
187 | { |
188 | char *param, *val; | |
189 | ||
f36462f0 | 190 | /* Chew leading spaces */ |
e7d2860b | 191 | args = skip_spaces(args); |
f36462f0 | 192 | |
9fb48c74 JC |
193 | if (args && *args) |
194 | pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); | |
195 | ||
1da177e4 LT |
196 | while (*args) { |
197 | int ret; | |
a416aba6 | 198 | int irq_was_disabled; |
1da177e4 LT |
199 | |
200 | args = next_arg(args, ¶m, &val); | |
a416aba6 | 201 | irq_was_disabled = irqs_disabled(); |
9fb48c74 | 202 | ret = parse_one(param, val, doing, params, num, |
026cee00 | 203 | min_level, max_level, unknown); |
a416aba6 AB |
204 | if (irq_was_disabled && !irqs_disabled()) { |
205 | printk(KERN_WARNING "parse_args(): option '%s' enabled " | |
206 | "irq's!\n", param); | |
207 | } | |
1da177e4 LT |
208 | switch (ret) { |
209 | case -ENOENT: | |
210 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
9fb48c74 | 211 | doing, param); |
1da177e4 LT |
212 | return ret; |
213 | case -ENOSPC: | |
214 | printk(KERN_ERR | |
215 | "%s: `%s' too large for parameter `%s'\n", | |
9fb48c74 | 216 | doing, val ?: "", param); |
1da177e4 LT |
217 | return ret; |
218 | case 0: | |
219 | break; | |
220 | default: | |
221 | printk(KERN_ERR | |
222 | "%s: `%s' invalid for parameter `%s'\n", | |
9fb48c74 | 223 | doing, val ?: "", param); |
1da177e4 LT |
224 | return ret; |
225 | } | |
226 | } | |
227 | ||
228 | /* All parsed OK. */ | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* Lazy bastard, eh? */ | |
233 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
9bbb9e5a | 234 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
1da177e4 | 235 | { \ |
1da177e4 | 236 | tmptype l; \ |
06b2a76d | 237 | int ret; \ |
1da177e4 | 238 | \ |
06b2a76d | 239 | ret = strtolfn(val, 0, &l); \ |
81c74136 SM |
240 | if (ret < 0 || ((type)l != l)) \ |
241 | return ret < 0 ? ret : -EINVAL; \ | |
1da177e4 LT |
242 | *((type *)kp->arg) = l; \ |
243 | return 0; \ | |
244 | } \ | |
9bbb9e5a | 245 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
1da177e4 LT |
246 | { \ |
247 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
a14fe249 | 248 | } \ |
9bbb9e5a RR |
249 | struct kernel_param_ops param_ops_##name = { \ |
250 | .set = param_set_##name, \ | |
251 | .get = param_get_##name, \ | |
252 | }; \ | |
a14fe249 | 253 | EXPORT_SYMBOL(param_set_##name); \ |
9bbb9e5a RR |
254 | EXPORT_SYMBOL(param_get_##name); \ |
255 | EXPORT_SYMBOL(param_ops_##name) | |
256 | ||
1da177e4 | 257 | |
06b2a76d YY |
258 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
259 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); | |
260 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); | |
261 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); | |
262 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); | |
263 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); | |
264 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); | |
1da177e4 | 265 | |
9bbb9e5a | 266 | int param_set_charp(const char *val, const struct kernel_param *kp) |
1da177e4 | 267 | { |
1da177e4 LT |
268 | if (strlen(val) > 1024) { |
269 | printk(KERN_ERR "%s: string parameter too long\n", | |
270 | kp->name); | |
271 | return -ENOSPC; | |
272 | } | |
273 | ||
a1054322 RR |
274 | maybe_kfree_parameter(*(char **)kp->arg); |
275 | ||
276 | /* This is a hack. We can't kmalloc in early boot, and we | |
e180a6b7 RR |
277 | * don't need to; this mangled commandline is preserved. */ |
278 | if (slab_is_available()) { | |
a1054322 | 279 | *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
d553ad86 | 280 | if (!*(char **)kp->arg) |
e180a6b7 | 281 | return -ENOMEM; |
a1054322 | 282 | strcpy(*(char **)kp->arg, val); |
e180a6b7 RR |
283 | } else |
284 | *(const char **)kp->arg = val; | |
285 | ||
1da177e4 LT |
286 | return 0; |
287 | } | |
a14fe249 | 288 | EXPORT_SYMBOL(param_set_charp); |
1da177e4 | 289 | |
9bbb9e5a | 290 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
1da177e4 LT |
291 | { |
292 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
293 | } | |
a14fe249 | 294 | EXPORT_SYMBOL(param_get_charp); |
1da177e4 | 295 | |
a1054322 RR |
296 | static void param_free_charp(void *arg) |
297 | { | |
298 | maybe_kfree_parameter(*((char **)arg)); | |
299 | } | |
300 | ||
9bbb9e5a RR |
301 | struct kernel_param_ops param_ops_charp = { |
302 | .set = param_set_charp, | |
303 | .get = param_get_charp, | |
a1054322 | 304 | .free = param_free_charp, |
9bbb9e5a RR |
305 | }; |
306 | EXPORT_SYMBOL(param_ops_charp); | |
307 | ||
fddd5201 | 308 | /* Actually could be a bool or an int, for historical reasons. */ |
9bbb9e5a | 309 | int param_set_bool(const char *val, const struct kernel_param *kp) |
1da177e4 LT |
310 | { |
311 | /* No equals means "set"... */ | |
312 | if (!val) val = "1"; | |
313 | ||
314 | /* One of =[yYnN01] */ | |
8b825281 | 315 | return strtobool(val, kp->arg); |
1da177e4 | 316 | } |
a14fe249 | 317 | EXPORT_SYMBOL(param_set_bool); |
1da177e4 | 318 | |
9bbb9e5a | 319 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
1da177e4 LT |
320 | { |
321 | /* Y and N chosen as being relatively non-coder friendly */ | |
8b825281 | 322 | return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N'); |
1da177e4 | 323 | } |
a14fe249 | 324 | EXPORT_SYMBOL(param_get_bool); |
1da177e4 | 325 | |
9bbb9e5a RR |
326 | struct kernel_param_ops param_ops_bool = { |
327 | .set = param_set_bool, | |
328 | .get = param_get_bool, | |
329 | }; | |
330 | EXPORT_SYMBOL(param_ops_bool); | |
331 | ||
fddd5201 | 332 | /* This one must be bool. */ |
9bbb9e5a | 333 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
1da177e4 | 334 | { |
fddd5201 RR |
335 | int ret; |
336 | bool boolval; | |
22e48eaf | 337 | struct kernel_param dummy; |
1da177e4 | 338 | |
22e48eaf | 339 | dummy.arg = &boolval; |
1da177e4 LT |
340 | ret = param_set_bool(val, &dummy); |
341 | if (ret == 0) | |
9a71af2c | 342 | *(bool *)kp->arg = !boolval; |
1da177e4 LT |
343 | return ret; |
344 | } | |
a14fe249 | 345 | EXPORT_SYMBOL(param_set_invbool); |
1da177e4 | 346 | |
9bbb9e5a | 347 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
1da177e4 | 348 | { |
9a71af2c | 349 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
1da177e4 | 350 | } |
a14fe249 | 351 | EXPORT_SYMBOL(param_get_invbool); |
1da177e4 | 352 | |
9bbb9e5a RR |
353 | struct kernel_param_ops param_ops_invbool = { |
354 | .set = param_set_invbool, | |
355 | .get = param_get_invbool, | |
356 | }; | |
357 | EXPORT_SYMBOL(param_ops_invbool); | |
358 | ||
69116f27 RR |
359 | int param_set_bint(const char *val, const struct kernel_param *kp) |
360 | { | |
361 | struct kernel_param boolkp; | |
362 | bool v; | |
363 | int ret; | |
364 | ||
365 | /* Match bool exactly, by re-using it. */ | |
366 | boolkp = *kp; | |
367 | boolkp.arg = &v; | |
69116f27 RR |
368 | |
369 | ret = param_set_bool(val, &boolkp); | |
370 | if (ret == 0) | |
371 | *(int *)kp->arg = v; | |
372 | return ret; | |
373 | } | |
374 | EXPORT_SYMBOL(param_set_bint); | |
375 | ||
376 | struct kernel_param_ops param_ops_bint = { | |
377 | .set = param_set_bint, | |
378 | .get = param_get_int, | |
379 | }; | |
380 | EXPORT_SYMBOL(param_ops_bint); | |
381 | ||
9730b5b0 | 382 | /* We break the rule and mangle the string. */ |
9871728b AB |
383 | static int param_array(const char *name, |
384 | const char *val, | |
385 | unsigned int min, unsigned int max, | |
386 | void *elem, int elemsize, | |
9bbb9e5a | 387 | int (*set)(const char *, const struct kernel_param *kp), |
026cee00 | 388 | s16 level, |
eb38a996 | 389 | unsigned int *num) |
1da177e4 LT |
390 | { |
391 | int ret; | |
392 | struct kernel_param kp; | |
393 | char save; | |
394 | ||
395 | /* Get the name right for errors. */ | |
396 | kp.name = name; | |
397 | kp.arg = elem; | |
026cee00 | 398 | kp.level = level; |
1da177e4 | 399 | |
1da177e4 LT |
400 | *num = 0; |
401 | /* We expect a comma-separated list of values. */ | |
402 | do { | |
403 | int len; | |
404 | ||
405 | if (*num == max) { | |
406 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
407 | name, max); | |
408 | return -EINVAL; | |
409 | } | |
410 | len = strcspn(val, ","); | |
411 | ||
412 | /* nul-terminate and parse */ | |
413 | save = val[len]; | |
414 | ((char *)val)[len] = '\0'; | |
907b29eb | 415 | BUG_ON(!mutex_is_locked(¶m_lock)); |
1da177e4 LT |
416 | ret = set(val, &kp); |
417 | ||
418 | if (ret != 0) | |
419 | return ret; | |
420 | kp.arg += elemsize; | |
421 | val += len+1; | |
422 | (*num)++; | |
423 | } while (save == ','); | |
424 | ||
425 | if (*num < min) { | |
426 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
427 | name, min); | |
428 | return -EINVAL; | |
429 | } | |
430 | return 0; | |
431 | } | |
432 | ||
9bbb9e5a | 433 | static int param_array_set(const char *val, const struct kernel_param *kp) |
1da177e4 | 434 | { |
22e48eaf | 435 | const struct kparam_array *arr = kp->arr; |
31143a12 | 436 | unsigned int temp_num; |
1da177e4 LT |
437 | |
438 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
026cee00 | 439 | arr->elemsize, arr->ops->set, kp->level, |
3c7d76e3 | 440 | arr->num ?: &temp_num); |
1da177e4 LT |
441 | } |
442 | ||
9bbb9e5a | 443 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
1da177e4 LT |
444 | { |
445 | int i, off, ret; | |
22e48eaf | 446 | const struct kparam_array *arr = kp->arr; |
1da177e4 LT |
447 | struct kernel_param p; |
448 | ||
449 | p = *kp; | |
450 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
451 | if (i) | |
452 | buffer[off++] = ','; | |
453 | p.arg = arr->elem + arr->elemsize * i; | |
907b29eb | 454 | BUG_ON(!mutex_is_locked(¶m_lock)); |
9bbb9e5a | 455 | ret = arr->ops->get(buffer + off, &p); |
1da177e4 LT |
456 | if (ret < 0) |
457 | return ret; | |
458 | off += ret; | |
459 | } | |
460 | buffer[off] = '\0'; | |
461 | return off; | |
462 | } | |
463 | ||
e6df34a4 RR |
464 | static void param_array_free(void *arg) |
465 | { | |
466 | unsigned int i; | |
467 | const struct kparam_array *arr = arg; | |
468 | ||
469 | if (arr->ops->free) | |
470 | for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) | |
471 | arr->ops->free(arr->elem + arr->elemsize * i); | |
472 | } | |
473 | ||
9bbb9e5a RR |
474 | struct kernel_param_ops param_array_ops = { |
475 | .set = param_array_set, | |
476 | .get = param_array_get, | |
e6df34a4 | 477 | .free = param_array_free, |
9bbb9e5a RR |
478 | }; |
479 | EXPORT_SYMBOL(param_array_ops); | |
480 | ||
481 | int param_set_copystring(const char *val, const struct kernel_param *kp) | |
1da177e4 | 482 | { |
22e48eaf | 483 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
484 | |
485 | if (strlen(val)+1 > kps->maxlen) { | |
486 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
487 | kp->name, kps->maxlen-1); | |
488 | return -ENOSPC; | |
489 | } | |
490 | strcpy(kps->string, val); | |
491 | return 0; | |
492 | } | |
a14fe249 | 493 | EXPORT_SYMBOL(param_set_copystring); |
1da177e4 | 494 | |
9bbb9e5a | 495 | int param_get_string(char *buffer, const struct kernel_param *kp) |
1da177e4 | 496 | { |
22e48eaf | 497 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
498 | return strlcpy(buffer, kps->string, kps->maxlen); |
499 | } | |
a14fe249 | 500 | EXPORT_SYMBOL(param_get_string); |
1da177e4 | 501 | |
9bbb9e5a RR |
502 | struct kernel_param_ops param_ops_string = { |
503 | .set = param_set_copystring, | |
504 | .get = param_get_string, | |
505 | }; | |
506 | EXPORT_SYMBOL(param_ops_string); | |
507 | ||
1da177e4 | 508 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
350f8258 EY |
509 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
510 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) | |
1da177e4 LT |
511 | |
512 | extern struct kernel_param __start___param[], __stop___param[]; | |
513 | ||
1da177e4 LT |
514 | struct param_attribute |
515 | { | |
516 | struct module_attribute mattr; | |
9bbb9e5a | 517 | const struct kernel_param *param; |
1da177e4 LT |
518 | }; |
519 | ||
520 | struct module_param_attrs | |
521 | { | |
9b473de8 | 522 | unsigned int num; |
1da177e4 LT |
523 | struct attribute_group grp; |
524 | struct param_attribute attrs[0]; | |
525 | }; | |
526 | ||
ef665c1a | 527 | #ifdef CONFIG_SYSFS |
350f8258 | 528 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
1da177e4 LT |
529 | |
530 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
4befb026 | 531 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
532 | { |
533 | int count; | |
534 | struct param_attribute *attribute = to_param_attr(mattr); | |
535 | ||
9bbb9e5a | 536 | if (!attribute->param->ops->get) |
1da177e4 LT |
537 | return -EPERM; |
538 | ||
907b29eb | 539 | mutex_lock(¶m_lock); |
9bbb9e5a | 540 | count = attribute->param->ops->get(buf, attribute->param); |
907b29eb | 541 | mutex_unlock(¶m_lock); |
1da177e4 LT |
542 | if (count > 0) { |
543 | strcat(buf, "\n"); | |
544 | ++count; | |
545 | } | |
546 | return count; | |
547 | } | |
548 | ||
549 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
550 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
4befb026 | 551 | struct module_kobject *km, |
1da177e4 LT |
552 | const char *buf, size_t len) |
553 | { | |
554 | int err; | |
555 | struct param_attribute *attribute = to_param_attr(mattr); | |
556 | ||
9bbb9e5a | 557 | if (!attribute->param->ops->set) |
1da177e4 LT |
558 | return -EPERM; |
559 | ||
907b29eb | 560 | mutex_lock(¶m_lock); |
9bbb9e5a | 561 | err = attribute->param->ops->set(buf, attribute->param); |
907b29eb | 562 | mutex_unlock(¶m_lock); |
1da177e4 LT |
563 | if (!err) |
564 | return len; | |
565 | return err; | |
566 | } | |
ef665c1a | 567 | #endif |
1da177e4 LT |
568 | |
569 | #ifdef CONFIG_MODULES | |
570 | #define __modinit | |
571 | #else | |
572 | #define __modinit __init | |
573 | #endif | |
574 | ||
ef665c1a | 575 | #ifdef CONFIG_SYSFS |
907b29eb RR |
576 | void __kernel_param_lock(void) |
577 | { | |
578 | mutex_lock(¶m_lock); | |
579 | } | |
580 | EXPORT_SYMBOL(__kernel_param_lock); | |
581 | ||
582 | void __kernel_param_unlock(void) | |
583 | { | |
584 | mutex_unlock(¶m_lock); | |
585 | } | |
586 | EXPORT_SYMBOL(__kernel_param_unlock); | |
587 | ||
1da177e4 | 588 | /* |
9b473de8 RR |
589 | * add_sysfs_param - add a parameter to sysfs |
590 | * @mk: struct module_kobject | |
591 | * @kparam: the actual parameter definition to add to sysfs | |
592 | * @name: name of parameter | |
1da177e4 | 593 | * |
9b473de8 RR |
594 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
595 | * create file in sysfs. Returns an error on out of memory. Always cleans up | |
596 | * if there's an error. | |
1da177e4 | 597 | */ |
9b473de8 | 598 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
9bbb9e5a | 599 | const struct kernel_param *kp, |
9b473de8 | 600 | const char *name) |
1da177e4 | 601 | { |
9b473de8 RR |
602 | struct module_param_attrs *new; |
603 | struct attribute **attrs; | |
604 | int err, num; | |
605 | ||
606 | /* We don't bother calling this with invisible parameters. */ | |
607 | BUG_ON(!kp->perm); | |
608 | ||
609 | if (!mk->mp) { | |
610 | num = 0; | |
611 | attrs = NULL; | |
612 | } else { | |
613 | num = mk->mp->num; | |
614 | attrs = mk->mp->grp.attrs; | |
1da177e4 LT |
615 | } |
616 | ||
9b473de8 RR |
617 | /* Enlarge. */ |
618 | new = krealloc(mk->mp, | |
619 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), | |
620 | GFP_KERNEL); | |
621 | if (!new) { | |
622 | kfree(mk->mp); | |
623 | err = -ENOMEM; | |
624 | goto fail; | |
625 | } | |
626 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); | |
627 | if (!attrs) { | |
628 | err = -ENOMEM; | |
629 | goto fail_free_new; | |
630 | } | |
1da177e4 | 631 | |
9b473de8 RR |
632 | /* Sysfs wants everything zeroed. */ |
633 | memset(new, 0, sizeof(*new)); | |
634 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); | |
635 | memset(&attrs[num], 0, sizeof(attrs[num])); | |
636 | new->grp.name = "parameters"; | |
637 | new->grp.attrs = attrs; | |
638 | ||
639 | /* Tack new one on the end. */ | |
a07e4156 | 640 | sysfs_attr_init(&new->attrs[num].mattr.attr); |
9b473de8 RR |
641 | new->attrs[num].param = kp; |
642 | new->attrs[num].mattr.show = param_attr_show; | |
643 | new->attrs[num].mattr.store = param_attr_store; | |
644 | new->attrs[num].mattr.attr.name = (char *)name; | |
645 | new->attrs[num].mattr.attr.mode = kp->perm; | |
646 | new->num = num+1; | |
647 | ||
648 | /* Fix up all the pointers, since krealloc can move us */ | |
649 | for (num = 0; num < new->num; num++) | |
650 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; | |
651 | new->grp.attrs[num] = NULL; | |
652 | ||
653 | mk->mp = new; | |
654 | return 0; | |
1da177e4 | 655 | |
9b473de8 RR |
656 | fail_free_new: |
657 | kfree(new); | |
658 | fail: | |
659 | mk->mp = NULL; | |
660 | return err; | |
661 | } | |
1da177e4 | 662 | |
d2441183 | 663 | #ifdef CONFIG_MODULES |
9b473de8 RR |
664 | static void free_module_param_attrs(struct module_kobject *mk) |
665 | { | |
666 | kfree(mk->mp->grp.attrs); | |
667 | kfree(mk->mp); | |
668 | mk->mp = NULL; | |
1da177e4 LT |
669 | } |
670 | ||
1da177e4 LT |
671 | /* |
672 | * module_param_sysfs_setup - setup sysfs support for one module | |
673 | * @mod: module | |
674 | * @kparam: module parameters (array) | |
675 | * @num_params: number of module parameters | |
676 | * | |
9b473de8 RR |
677 | * Adds sysfs entries for module parameters under |
678 | * /sys/module/[mod->name]/parameters/ | |
1da177e4 LT |
679 | */ |
680 | int module_param_sysfs_setup(struct module *mod, | |
9bbb9e5a | 681 | const struct kernel_param *kparam, |
1da177e4 LT |
682 | unsigned int num_params) |
683 | { | |
9b473de8 RR |
684 | int i, err; |
685 | bool params = false; | |
686 | ||
687 | for (i = 0; i < num_params; i++) { | |
688 | if (kparam[i].perm == 0) | |
689 | continue; | |
690 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); | |
691 | if (err) | |
692 | return err; | |
693 | params = true; | |
694 | } | |
1da177e4 | 695 | |
9b473de8 RR |
696 | if (!params) |
697 | return 0; | |
1da177e4 | 698 | |
9b473de8 RR |
699 | /* Create the param group. */ |
700 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
701 | if (err) | |
702 | free_module_param_attrs(&mod->mkobj); | |
703 | return err; | |
1da177e4 LT |
704 | } |
705 | ||
706 | /* | |
707 | * module_param_sysfs_remove - remove sysfs support for one module | |
708 | * @mod: module | |
709 | * | |
710 | * Remove sysfs entries for module parameters and the corresponding | |
711 | * kobject. | |
712 | */ | |
713 | void module_param_sysfs_remove(struct module *mod) | |
714 | { | |
9b473de8 RR |
715 | if (mod->mkobj.mp) { |
716 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
1da177e4 LT |
717 | /* We are positive that no one is using any param |
718 | * attrs at this point. Deallocate immediately. */ | |
9b473de8 | 719 | free_module_param_attrs(&mod->mkobj); |
1da177e4 LT |
720 | } |
721 | } | |
722 | #endif | |
723 | ||
e180a6b7 RR |
724 | void destroy_params(const struct kernel_param *params, unsigned num) |
725 | { | |
e6df34a4 RR |
726 | unsigned int i; |
727 | ||
728 | for (i = 0; i < num; i++) | |
729 | if (params[i].ops->free) | |
730 | params[i].ops->free(params[i].arg); | |
e180a6b7 RR |
731 | } |
732 | ||
e94965ed | 733 | static struct module_kobject * __init locate_module_kobject(const char *name) |
1da177e4 LT |
734 | { |
735 | struct module_kobject *mk; | |
9b473de8 RR |
736 | struct kobject *kobj; |
737 | int err; | |
1da177e4 | 738 | |
9b473de8 RR |
739 | kobj = kset_find_obj(module_kset, name); |
740 | if (kobj) { | |
9b473de8 | 741 | mk = to_module_kobject(kobj); |
9b473de8 RR |
742 | } else { |
743 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
744 | BUG_ON(!mk); | |
745 | ||
746 | mk->mod = THIS_MODULE; | |
747 | mk->kobj.kset = module_kset; | |
748 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, | |
749 | "%s", name); | |
88bfa324 KS |
750 | #ifdef CONFIG_MODULES |
751 | if (!err) | |
752 | err = sysfs_create_file(&mk->kobj, &module_uevent.attr); | |
753 | #endif | |
9b473de8 RR |
754 | if (err) { |
755 | kobject_put(&mk->kobj); | |
e94965ed DT |
756 | printk(KERN_ERR |
757 | "Module '%s' failed add to sysfs, error number %d\n", | |
758 | name, err); | |
759 | printk(KERN_ERR | |
760 | "The system will be unstable now.\n"); | |
761 | return NULL; | |
9b473de8 | 762 | } |
e94965ed DT |
763 | |
764 | /* So that we hold reference in both cases. */ | |
9b473de8 | 765 | kobject_get(&mk->kobj); |
74c5b597 | 766 | } |
9b473de8 | 767 | |
e94965ed DT |
768 | return mk; |
769 | } | |
770 | ||
771 | static void __init kernel_add_sysfs_param(const char *name, | |
772 | struct kernel_param *kparam, | |
773 | unsigned int name_skip) | |
774 | { | |
775 | struct module_kobject *mk; | |
776 | int err; | |
777 | ||
778 | mk = locate_module_kobject(name); | |
779 | if (!mk) | |
780 | return; | |
781 | ||
782 | /* We need to remove old parameters before adding more. */ | |
783 | if (mk->mp) | |
784 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); | |
785 | ||
9b473de8 RR |
786 | /* These should not fail at boot. */ |
787 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); | |
788 | BUG_ON(err); | |
789 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); | |
790 | BUG_ON(err); | |
f30c53a8 | 791 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
9b473de8 | 792 | kobject_put(&mk->kobj); |
1da177e4 LT |
793 | } |
794 | ||
795 | /* | |
796 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
797 | * | |
798 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
799 | * | |
800 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
801 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
802 | * extract the "module" name for all built-in kernel_param-eters, | |
9b473de8 | 803 | * and for all who have the same, call kernel_add_sysfs_param. |
1da177e4 LT |
804 | */ |
805 | static void __init param_sysfs_builtin(void) | |
806 | { | |
9b473de8 RR |
807 | struct kernel_param *kp; |
808 | unsigned int name_len; | |
809 | char modname[MODULE_NAME_LEN]; | |
1da177e4 | 810 | |
9b473de8 | 811 | for (kp = __start___param; kp < __stop___param; kp++) { |
1da177e4 LT |
812 | char *dot; |
813 | ||
9b473de8 RR |
814 | if (kp->perm == 0) |
815 | continue; | |
1da177e4 | 816 | |
730b69d2 | 817 | dot = strchr(kp->name, '.'); |
1da177e4 | 818 | if (!dot) { |
67e67cea RR |
819 | /* This happens for core_param() */ |
820 | strcpy(modname, "kernel"); | |
821 | name_len = 0; | |
822 | } else { | |
823 | name_len = dot - kp->name + 1; | |
824 | strlcpy(modname, kp->name, name_len); | |
1da177e4 | 825 | } |
67e67cea | 826 | kernel_add_sysfs_param(modname, kp, name_len); |
1da177e4 | 827 | } |
1da177e4 LT |
828 | } |
829 | ||
e94965ed | 830 | ssize_t __modver_version_show(struct module_attribute *mattr, |
4befb026 | 831 | struct module_kobject *mk, char *buf) |
e94965ed DT |
832 | { |
833 | struct module_version_attribute *vattr = | |
834 | container_of(mattr, struct module_version_attribute, mattr); | |
835 | ||
836 | return sprintf(buf, "%s\n", vattr->version); | |
837 | } | |
838 | ||
b4bc8428 DT |
839 | extern const struct module_version_attribute *__start___modver[]; |
840 | extern const struct module_version_attribute *__stop___modver[]; | |
e94965ed DT |
841 | |
842 | static void __init version_sysfs_builtin(void) | |
843 | { | |
b4bc8428 | 844 | const struct module_version_attribute **p; |
e94965ed DT |
845 | struct module_kobject *mk; |
846 | int err; | |
847 | ||
b4bc8428 DT |
848 | for (p = __start___modver; p < __stop___modver; p++) { |
849 | const struct module_version_attribute *vattr = *p; | |
850 | ||
e94965ed DT |
851 | mk = locate_module_kobject(vattr->module_name); |
852 | if (mk) { | |
853 | err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); | |
854 | kobject_uevent(&mk->kobj, KOBJ_ADD); | |
855 | kobject_put(&mk->kobj); | |
856 | } | |
857 | } | |
858 | } | |
1da177e4 LT |
859 | |
860 | /* module-related sysfs stuff */ | |
1da177e4 | 861 | |
1da177e4 LT |
862 | static ssize_t module_attr_show(struct kobject *kobj, |
863 | struct attribute *attr, | |
864 | char *buf) | |
865 | { | |
866 | struct module_attribute *attribute; | |
867 | struct module_kobject *mk; | |
868 | int ret; | |
869 | ||
870 | attribute = to_module_attr(attr); | |
871 | mk = to_module_kobject(kobj); | |
872 | ||
873 | if (!attribute->show) | |
70f2817a | 874 | return -EIO; |
1da177e4 | 875 | |
4befb026 | 876 | ret = attribute->show(attribute, mk, buf); |
1da177e4 | 877 | |
1da177e4 LT |
878 | return ret; |
879 | } | |
880 | ||
881 | static ssize_t module_attr_store(struct kobject *kobj, | |
882 | struct attribute *attr, | |
883 | const char *buf, size_t len) | |
884 | { | |
885 | struct module_attribute *attribute; | |
886 | struct module_kobject *mk; | |
887 | int ret; | |
888 | ||
889 | attribute = to_module_attr(attr); | |
890 | mk = to_module_kobject(kobj); | |
891 | ||
892 | if (!attribute->store) | |
70f2817a | 893 | return -EIO; |
1da177e4 | 894 | |
4befb026 | 895 | ret = attribute->store(attribute, mk, buf, len); |
1da177e4 | 896 | |
1da177e4 LT |
897 | return ret; |
898 | } | |
899 | ||
52cf25d0 | 900 | static const struct sysfs_ops module_sysfs_ops = { |
1da177e4 LT |
901 | .show = module_attr_show, |
902 | .store = module_attr_store, | |
903 | }; | |
904 | ||
270a6c4c KS |
905 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
906 | { | |
907 | struct kobj_type *ktype = get_ktype(kobj); | |
908 | ||
909 | if (ktype == &module_ktype) | |
910 | return 1; | |
911 | return 0; | |
912 | } | |
913 | ||
9cd43611 | 914 | static const struct kset_uevent_ops module_uevent_ops = { |
270a6c4c KS |
915 | .filter = uevent_filter, |
916 | }; | |
917 | ||
7405c1e1 | 918 | struct kset *module_kset; |
823bccfc | 919 | int module_sysfs_initialized; |
1da177e4 | 920 | |
7405c1e1 | 921 | struct kobj_type module_ktype = { |
1da177e4 LT |
922 | .sysfs_ops = &module_sysfs_ops, |
923 | }; | |
924 | ||
1da177e4 LT |
925 | /* |
926 | * param_sysfs_init - wrapper for built-in params support | |
927 | */ | |
928 | static int __init param_sysfs_init(void) | |
929 | { | |
7405c1e1 GKH |
930 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
931 | if (!module_kset) { | |
932 | printk(KERN_WARNING "%s (%d): error creating kset\n", | |
933 | __FILE__, __LINE__); | |
934 | return -ENOMEM; | |
d8c7649e | 935 | } |
823bccfc | 936 | module_sysfs_initialized = 1; |
1da177e4 | 937 | |
e94965ed | 938 | version_sysfs_builtin(); |
1da177e4 LT |
939 | param_sysfs_builtin(); |
940 | ||
941 | return 0; | |
942 | } | |
d10be6d1 | 943 | subsys_initcall(param_sysfs_init); |
1da177e4 | 944 | |
7405c1e1 | 945 | #endif /* CONFIG_SYSFS */ |