Commit | Line | Data |
---|---|---|
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/moduleparam.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/err.h> | |
4e57b681 | 25 | #include <linux/slab.h> |
26d052bf | 26 | #include <linux/ctype.h> |
1da177e4 LT |
27 | |
28 | #if 0 | |
29 | #define DEBUGP printk | |
30 | #else | |
31 | #define DEBUGP(fmt, a...) | |
32 | #endif | |
33 | ||
b9e20a92 | 34 | static inline char dash2underscore(char c) |
1da177e4 LT |
35 | { |
36 | if (c == '-') | |
37 | return '_'; | |
38 | return c; | |
39 | } | |
40 | ||
41 | static inline int parameq(const char *input, const char *paramname) | |
42 | { | |
43 | unsigned int i; | |
44 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) | |
45 | if (input[i] == '\0') | |
46 | return 1; | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int parse_one(char *param, | |
51 | char *val, | |
52 | struct kernel_param *params, | |
53 | unsigned num_params, | |
54 | int (*handle_unknown)(char *param, char *val)) | |
55 | { | |
56 | unsigned int i; | |
57 | ||
58 | /* Find parameter */ | |
59 | for (i = 0; i < num_params; i++) { | |
60 | if (parameq(param, params[i].name)) { | |
2e9fb995 | 61 | /* Noone handled NULL, so do it here. */ |
9bbb9e5a | 62 | if (!val && params[i].ops->set != param_set_bool) |
2e9fb995 | 63 | return -EINVAL; |
1da177e4 | 64 | DEBUGP("They are equal! Calling %p\n", |
9bbb9e5a RR |
65 | params[i].ops->set); |
66 | return params[i].ops->set(val, ¶ms[i]); | |
1da177e4 LT |
67 | } |
68 | } | |
69 | ||
70 | if (handle_unknown) { | |
71 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); | |
72 | return handle_unknown(param, val); | |
73 | } | |
74 | ||
75 | DEBUGP("Unknown argument `%s'\n", param); | |
76 | return -ENOENT; | |
77 | } | |
78 | ||
79 | /* You can use " around spaces, but can't escape ". */ | |
80 | /* Hyphens and underscores equivalent in parameter names. */ | |
81 | static char *next_arg(char *args, char **param, char **val) | |
82 | { | |
83 | unsigned int i, equals = 0; | |
84 | int in_quote = 0, quoted = 0; | |
85 | char *next; | |
86 | ||
1da177e4 LT |
87 | if (*args == '"') { |
88 | args++; | |
89 | in_quote = 1; | |
90 | quoted = 1; | |
91 | } | |
92 | ||
93 | for (i = 0; args[i]; i++) { | |
26d052bf | 94 | if (isspace(args[i]) && !in_quote) |
1da177e4 LT |
95 | break; |
96 | if (equals == 0) { | |
97 | if (args[i] == '=') | |
98 | equals = i; | |
99 | } | |
100 | if (args[i] == '"') | |
101 | in_quote = !in_quote; | |
102 | } | |
103 | ||
104 | *param = args; | |
105 | if (!equals) | |
106 | *val = NULL; | |
107 | else { | |
108 | args[equals] = '\0'; | |
109 | *val = args + equals + 1; | |
110 | ||
111 | /* Don't include quotes in value. */ | |
112 | if (**val == '"') { | |
113 | (*val)++; | |
114 | if (args[i-1] == '"') | |
115 | args[i-1] = '\0'; | |
116 | } | |
117 | if (quoted && args[i-1] == '"') | |
118 | args[i-1] = '\0'; | |
119 | } | |
120 | ||
121 | if (args[i]) { | |
122 | args[i] = '\0'; | |
123 | next = args + i + 1; | |
124 | } else | |
125 | next = args + i; | |
f36462f0 RR |
126 | |
127 | /* Chew up trailing spaces. */ | |
e7d2860b | 128 | return skip_spaces(next); |
1da177e4 LT |
129 | } |
130 | ||
131 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
132 | int parse_args(const char *name, | |
133 | char *args, | |
134 | struct kernel_param *params, | |
135 | unsigned num, | |
136 | int (*unknown)(char *param, char *val)) | |
137 | { | |
138 | char *param, *val; | |
139 | ||
140 | DEBUGP("Parsing ARGS: %s\n", args); | |
141 | ||
f36462f0 | 142 | /* Chew leading spaces */ |
e7d2860b | 143 | args = skip_spaces(args); |
f36462f0 | 144 | |
1da177e4 LT |
145 | while (*args) { |
146 | int ret; | |
a416aba6 | 147 | int irq_was_disabled; |
1da177e4 LT |
148 | |
149 | args = next_arg(args, ¶m, &val); | |
a416aba6 | 150 | irq_was_disabled = irqs_disabled(); |
1da177e4 | 151 | ret = parse_one(param, val, params, num, unknown); |
a416aba6 AB |
152 | if (irq_was_disabled && !irqs_disabled()) { |
153 | printk(KERN_WARNING "parse_args(): option '%s' enabled " | |
154 | "irq's!\n", param); | |
155 | } | |
1da177e4 LT |
156 | switch (ret) { |
157 | case -ENOENT: | |
158 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
159 | name, param); | |
160 | return ret; | |
161 | case -ENOSPC: | |
162 | printk(KERN_ERR | |
163 | "%s: `%s' too large for parameter `%s'\n", | |
164 | name, val ?: "", param); | |
165 | return ret; | |
166 | case 0: | |
167 | break; | |
168 | default: | |
169 | printk(KERN_ERR | |
170 | "%s: `%s' invalid for parameter `%s'\n", | |
171 | name, val ?: "", param); | |
172 | return ret; | |
173 | } | |
174 | } | |
175 | ||
176 | /* All parsed OK. */ | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* Lazy bastard, eh? */ | |
181 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
9bbb9e5a | 182 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
1da177e4 | 183 | { \ |
1da177e4 | 184 | tmptype l; \ |
06b2a76d | 185 | int ret; \ |
1da177e4 | 186 | \ |
06b2a76d YY |
187 | ret = strtolfn(val, 0, &l); \ |
188 | if (ret == -EINVAL || ((type)l != l)) \ | |
1da177e4 LT |
189 | return -EINVAL; \ |
190 | *((type *)kp->arg) = l; \ | |
191 | return 0; \ | |
192 | } \ | |
9bbb9e5a | 193 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
1da177e4 LT |
194 | { \ |
195 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
a14fe249 | 196 | } \ |
9bbb9e5a RR |
197 | struct kernel_param_ops param_ops_##name = { \ |
198 | .set = param_set_##name, \ | |
199 | .get = param_get_##name, \ | |
200 | }; \ | |
a14fe249 | 201 | EXPORT_SYMBOL(param_set_##name); \ |
9bbb9e5a RR |
202 | EXPORT_SYMBOL(param_get_##name); \ |
203 | EXPORT_SYMBOL(param_ops_##name) | |
204 | ||
1da177e4 | 205 | |
06b2a76d YY |
206 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
207 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); | |
208 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); | |
209 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); | |
210 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); | |
211 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); | |
212 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); | |
1da177e4 | 213 | |
9bbb9e5a | 214 | int param_set_charp(const char *val, const struct kernel_param *kp) |
1da177e4 | 215 | { |
1da177e4 LT |
216 | if (strlen(val) > 1024) { |
217 | printk(KERN_ERR "%s: string parameter too long\n", | |
218 | kp->name); | |
219 | return -ENOSPC; | |
220 | } | |
221 | ||
e180a6b7 RR |
222 | /* This is a hack. We can't need to strdup in early boot, and we |
223 | * don't need to; this mangled commandline is preserved. */ | |
224 | if (slab_is_available()) { | |
e180a6b7 | 225 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
d553ad86 | 226 | if (!*(char **)kp->arg) |
e180a6b7 RR |
227 | return -ENOMEM; |
228 | } else | |
229 | *(const char **)kp->arg = val; | |
230 | ||
1da177e4 LT |
231 | return 0; |
232 | } | |
a14fe249 | 233 | EXPORT_SYMBOL(param_set_charp); |
1da177e4 | 234 | |
9bbb9e5a | 235 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
1da177e4 LT |
236 | { |
237 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
238 | } | |
a14fe249 | 239 | EXPORT_SYMBOL(param_get_charp); |
1da177e4 | 240 | |
9bbb9e5a RR |
241 | struct kernel_param_ops param_ops_charp = { |
242 | .set = param_set_charp, | |
243 | .get = param_get_charp, | |
244 | }; | |
245 | EXPORT_SYMBOL(param_ops_charp); | |
246 | ||
fddd5201 | 247 | /* Actually could be a bool or an int, for historical reasons. */ |
9bbb9e5a | 248 | int param_set_bool(const char *val, const struct kernel_param *kp) |
1da177e4 | 249 | { |
fddd5201 RR |
250 | bool v; |
251 | ||
1da177e4 LT |
252 | /* No equals means "set"... */ |
253 | if (!val) val = "1"; | |
254 | ||
255 | /* One of =[yYnN01] */ | |
256 | switch (val[0]) { | |
257 | case 'y': case 'Y': case '1': | |
fddd5201 RR |
258 | v = true; |
259 | break; | |
1da177e4 | 260 | case 'n': case 'N': case '0': |
fddd5201 RR |
261 | v = false; |
262 | break; | |
263 | default: | |
264 | return -EINVAL; | |
1da177e4 | 265 | } |
fddd5201 RR |
266 | |
267 | if (kp->flags & KPARAM_ISBOOL) | |
268 | *(bool *)kp->arg = v; | |
269 | else | |
270 | *(int *)kp->arg = v; | |
271 | return 0; | |
1da177e4 | 272 | } |
a14fe249 | 273 | EXPORT_SYMBOL(param_set_bool); |
1da177e4 | 274 | |
9bbb9e5a | 275 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
1da177e4 | 276 | { |
fddd5201 RR |
277 | bool val; |
278 | if (kp->flags & KPARAM_ISBOOL) | |
279 | val = *(bool *)kp->arg; | |
280 | else | |
281 | val = *(int *)kp->arg; | |
282 | ||
1da177e4 | 283 | /* Y and N chosen as being relatively non-coder friendly */ |
fddd5201 | 284 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
1da177e4 | 285 | } |
a14fe249 | 286 | EXPORT_SYMBOL(param_get_bool); |
1da177e4 | 287 | |
9bbb9e5a RR |
288 | struct kernel_param_ops param_ops_bool = { |
289 | .set = param_set_bool, | |
290 | .get = param_get_bool, | |
291 | }; | |
292 | EXPORT_SYMBOL(param_ops_bool); | |
293 | ||
fddd5201 | 294 | /* This one must be bool. */ |
9bbb9e5a | 295 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
1da177e4 | 296 | { |
fddd5201 RR |
297 | int ret; |
298 | bool boolval; | |
22e48eaf | 299 | struct kernel_param dummy; |
1da177e4 | 300 | |
22e48eaf | 301 | dummy.arg = &boolval; |
fddd5201 | 302 | dummy.flags = KPARAM_ISBOOL; |
1da177e4 LT |
303 | ret = param_set_bool(val, &dummy); |
304 | if (ret == 0) | |
9a71af2c | 305 | *(bool *)kp->arg = !boolval; |
1da177e4 LT |
306 | return ret; |
307 | } | |
a14fe249 | 308 | EXPORT_SYMBOL(param_set_invbool); |
1da177e4 | 309 | |
9bbb9e5a | 310 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
1da177e4 | 311 | { |
9a71af2c | 312 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
1da177e4 | 313 | } |
a14fe249 | 314 | EXPORT_SYMBOL(param_get_invbool); |
1da177e4 | 315 | |
9bbb9e5a RR |
316 | struct kernel_param_ops param_ops_invbool = { |
317 | .set = param_set_invbool, | |
318 | .get = param_get_invbool, | |
319 | }; | |
320 | EXPORT_SYMBOL(param_ops_invbool); | |
321 | ||
9730b5b0 | 322 | /* We break the rule and mangle the string. */ |
9871728b AB |
323 | static int param_array(const char *name, |
324 | const char *val, | |
325 | unsigned int min, unsigned int max, | |
326 | void *elem, int elemsize, | |
9bbb9e5a | 327 | int (*set)(const char *, const struct kernel_param *kp), |
3c7d76e3 | 328 | u16 flags, |
eb38a996 | 329 | unsigned int *num) |
1da177e4 LT |
330 | { |
331 | int ret; | |
332 | struct kernel_param kp; | |
333 | char save; | |
334 | ||
335 | /* Get the name right for errors. */ | |
336 | kp.name = name; | |
337 | kp.arg = elem; | |
3c7d76e3 | 338 | kp.flags = flags; |
1da177e4 | 339 | |
1da177e4 LT |
340 | *num = 0; |
341 | /* We expect a comma-separated list of values. */ | |
342 | do { | |
343 | int len; | |
344 | ||
345 | if (*num == max) { | |
346 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
347 | name, max); | |
348 | return -EINVAL; | |
349 | } | |
350 | len = strcspn(val, ","); | |
351 | ||
352 | /* nul-terminate and parse */ | |
353 | save = val[len]; | |
354 | ((char *)val)[len] = '\0'; | |
355 | ret = set(val, &kp); | |
356 | ||
357 | if (ret != 0) | |
358 | return ret; | |
359 | kp.arg += elemsize; | |
360 | val += len+1; | |
361 | (*num)++; | |
362 | } while (save == ','); | |
363 | ||
364 | if (*num < min) { | |
365 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
366 | name, min); | |
367 | return -EINVAL; | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
9bbb9e5a | 372 | static int param_array_set(const char *val, const struct kernel_param *kp) |
1da177e4 | 373 | { |
22e48eaf | 374 | const struct kparam_array *arr = kp->arr; |
31143a12 | 375 | unsigned int temp_num; |
1da177e4 LT |
376 | |
377 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
9bbb9e5a | 378 | arr->elemsize, arr->ops->set, kp->flags, |
3c7d76e3 | 379 | arr->num ?: &temp_num); |
1da177e4 LT |
380 | } |
381 | ||
9bbb9e5a | 382 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
1da177e4 LT |
383 | { |
384 | int i, off, ret; | |
22e48eaf | 385 | const struct kparam_array *arr = kp->arr; |
1da177e4 LT |
386 | struct kernel_param p; |
387 | ||
388 | p = *kp; | |
389 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
390 | if (i) | |
391 | buffer[off++] = ','; | |
392 | p.arg = arr->elem + arr->elemsize * i; | |
9bbb9e5a | 393 | ret = arr->ops->get(buffer + off, &p); |
1da177e4 LT |
394 | if (ret < 0) |
395 | return ret; | |
396 | off += ret; | |
397 | } | |
398 | buffer[off] = '\0'; | |
399 | return off; | |
400 | } | |
401 | ||
9bbb9e5a RR |
402 | struct kernel_param_ops param_array_ops = { |
403 | .set = param_array_set, | |
404 | .get = param_array_get, | |
405 | }; | |
406 | EXPORT_SYMBOL(param_array_ops); | |
407 | ||
408 | int param_set_copystring(const char *val, const struct kernel_param *kp) | |
1da177e4 | 409 | { |
22e48eaf | 410 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
411 | |
412 | if (strlen(val)+1 > kps->maxlen) { | |
413 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
414 | kp->name, kps->maxlen-1); | |
415 | return -ENOSPC; | |
416 | } | |
417 | strcpy(kps->string, val); | |
418 | return 0; | |
419 | } | |
a14fe249 | 420 | EXPORT_SYMBOL(param_set_copystring); |
1da177e4 | 421 | |
9bbb9e5a | 422 | int param_get_string(char *buffer, const struct kernel_param *kp) |
1da177e4 | 423 | { |
22e48eaf | 424 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
425 | return strlcpy(buffer, kps->string, kps->maxlen); |
426 | } | |
a14fe249 | 427 | EXPORT_SYMBOL(param_get_string); |
1da177e4 | 428 | |
9bbb9e5a RR |
429 | struct kernel_param_ops param_ops_string = { |
430 | .set = param_set_copystring, | |
431 | .get = param_get_string, | |
432 | }; | |
433 | EXPORT_SYMBOL(param_ops_string); | |
434 | ||
1da177e4 | 435 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
350f8258 EY |
436 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
437 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) | |
1da177e4 LT |
438 | |
439 | extern struct kernel_param __start___param[], __stop___param[]; | |
440 | ||
1da177e4 LT |
441 | struct param_attribute |
442 | { | |
443 | struct module_attribute mattr; | |
9bbb9e5a | 444 | const struct kernel_param *param; |
1da177e4 LT |
445 | }; |
446 | ||
447 | struct module_param_attrs | |
448 | { | |
9b473de8 | 449 | unsigned int num; |
1da177e4 LT |
450 | struct attribute_group grp; |
451 | struct param_attribute attrs[0]; | |
452 | }; | |
453 | ||
ef665c1a | 454 | #ifdef CONFIG_SYSFS |
350f8258 | 455 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
1da177e4 LT |
456 | |
457 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
458 | struct module *mod, char *buf) | |
459 | { | |
460 | int count; | |
461 | struct param_attribute *attribute = to_param_attr(mattr); | |
462 | ||
9bbb9e5a | 463 | if (!attribute->param->ops->get) |
1da177e4 LT |
464 | return -EPERM; |
465 | ||
9bbb9e5a | 466 | count = attribute->param->ops->get(buf, attribute->param); |
1da177e4 LT |
467 | if (count > 0) { |
468 | strcat(buf, "\n"); | |
469 | ++count; | |
470 | } | |
471 | return count; | |
472 | } | |
473 | ||
474 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
475 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
476 | struct module *owner, | |
477 | const char *buf, size_t len) | |
478 | { | |
479 | int err; | |
480 | struct param_attribute *attribute = to_param_attr(mattr); | |
481 | ||
9bbb9e5a | 482 | if (!attribute->param->ops->set) |
1da177e4 LT |
483 | return -EPERM; |
484 | ||
9bbb9e5a | 485 | err = attribute->param->ops->set(buf, attribute->param); |
1da177e4 LT |
486 | if (!err) |
487 | return len; | |
488 | return err; | |
489 | } | |
ef665c1a | 490 | #endif |
1da177e4 LT |
491 | |
492 | #ifdef CONFIG_MODULES | |
493 | #define __modinit | |
494 | #else | |
495 | #define __modinit __init | |
496 | #endif | |
497 | ||
ef665c1a | 498 | #ifdef CONFIG_SYSFS |
1da177e4 | 499 | /* |
9b473de8 RR |
500 | * add_sysfs_param - add a parameter to sysfs |
501 | * @mk: struct module_kobject | |
502 | * @kparam: the actual parameter definition to add to sysfs | |
503 | * @name: name of parameter | |
1da177e4 | 504 | * |
9b473de8 RR |
505 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
506 | * create file in sysfs. Returns an error on out of memory. Always cleans up | |
507 | * if there's an error. | |
1da177e4 | 508 | */ |
9b473de8 | 509 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
9bbb9e5a | 510 | const struct kernel_param *kp, |
9b473de8 | 511 | const char *name) |
1da177e4 | 512 | { |
9b473de8 RR |
513 | struct module_param_attrs *new; |
514 | struct attribute **attrs; | |
515 | int err, num; | |
516 | ||
517 | /* We don't bother calling this with invisible parameters. */ | |
518 | BUG_ON(!kp->perm); | |
519 | ||
520 | if (!mk->mp) { | |
521 | num = 0; | |
522 | attrs = NULL; | |
523 | } else { | |
524 | num = mk->mp->num; | |
525 | attrs = mk->mp->grp.attrs; | |
1da177e4 LT |
526 | } |
527 | ||
9b473de8 RR |
528 | /* Enlarge. */ |
529 | new = krealloc(mk->mp, | |
530 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), | |
531 | GFP_KERNEL); | |
532 | if (!new) { | |
533 | kfree(mk->mp); | |
534 | err = -ENOMEM; | |
535 | goto fail; | |
536 | } | |
537 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); | |
538 | if (!attrs) { | |
539 | err = -ENOMEM; | |
540 | goto fail_free_new; | |
541 | } | |
1da177e4 | 542 | |
9b473de8 RR |
543 | /* Sysfs wants everything zeroed. */ |
544 | memset(new, 0, sizeof(*new)); | |
545 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); | |
546 | memset(&attrs[num], 0, sizeof(attrs[num])); | |
547 | new->grp.name = "parameters"; | |
548 | new->grp.attrs = attrs; | |
549 | ||
550 | /* Tack new one on the end. */ | |
a07e4156 | 551 | sysfs_attr_init(&new->attrs[num].mattr.attr); |
9b473de8 RR |
552 | new->attrs[num].param = kp; |
553 | new->attrs[num].mattr.show = param_attr_show; | |
554 | new->attrs[num].mattr.store = param_attr_store; | |
555 | new->attrs[num].mattr.attr.name = (char *)name; | |
556 | new->attrs[num].mattr.attr.mode = kp->perm; | |
557 | new->num = num+1; | |
558 | ||
559 | /* Fix up all the pointers, since krealloc can move us */ | |
560 | for (num = 0; num < new->num; num++) | |
561 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; | |
562 | new->grp.attrs[num] = NULL; | |
563 | ||
564 | mk->mp = new; | |
565 | return 0; | |
1da177e4 | 566 | |
9b473de8 RR |
567 | fail_free_new: |
568 | kfree(new); | |
569 | fail: | |
570 | mk->mp = NULL; | |
571 | return err; | |
572 | } | |
1da177e4 | 573 | |
d2441183 | 574 | #ifdef CONFIG_MODULES |
9b473de8 RR |
575 | static void free_module_param_attrs(struct module_kobject *mk) |
576 | { | |
577 | kfree(mk->mp->grp.attrs); | |
578 | kfree(mk->mp); | |
579 | mk->mp = NULL; | |
1da177e4 LT |
580 | } |
581 | ||
1da177e4 LT |
582 | /* |
583 | * module_param_sysfs_setup - setup sysfs support for one module | |
584 | * @mod: module | |
585 | * @kparam: module parameters (array) | |
586 | * @num_params: number of module parameters | |
587 | * | |
9b473de8 RR |
588 | * Adds sysfs entries for module parameters under |
589 | * /sys/module/[mod->name]/parameters/ | |
1da177e4 LT |
590 | */ |
591 | int module_param_sysfs_setup(struct module *mod, | |
9bbb9e5a | 592 | const struct kernel_param *kparam, |
1da177e4 LT |
593 | unsigned int num_params) |
594 | { | |
9b473de8 RR |
595 | int i, err; |
596 | bool params = false; | |
597 | ||
598 | for (i = 0; i < num_params; i++) { | |
599 | if (kparam[i].perm == 0) | |
600 | continue; | |
601 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); | |
602 | if (err) | |
603 | return err; | |
604 | params = true; | |
605 | } | |
1da177e4 | 606 | |
9b473de8 RR |
607 | if (!params) |
608 | return 0; | |
1da177e4 | 609 | |
9b473de8 RR |
610 | /* Create the param group. */ |
611 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
612 | if (err) | |
613 | free_module_param_attrs(&mod->mkobj); | |
614 | return err; | |
1da177e4 LT |
615 | } |
616 | ||
617 | /* | |
618 | * module_param_sysfs_remove - remove sysfs support for one module | |
619 | * @mod: module | |
620 | * | |
621 | * Remove sysfs entries for module parameters and the corresponding | |
622 | * kobject. | |
623 | */ | |
624 | void module_param_sysfs_remove(struct module *mod) | |
625 | { | |
9b473de8 RR |
626 | if (mod->mkobj.mp) { |
627 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
1da177e4 LT |
628 | /* We are positive that no one is using any param |
629 | * attrs at this point. Deallocate immediately. */ | |
9b473de8 | 630 | free_module_param_attrs(&mod->mkobj); |
1da177e4 LT |
631 | } |
632 | } | |
633 | #endif | |
634 | ||
e180a6b7 RR |
635 | void destroy_params(const struct kernel_param *params, unsigned num) |
636 | { | |
65afac7d | 637 | /* FIXME: This should free kmalloced charp parameters. It doesn't. */ |
e180a6b7 RR |
638 | } |
639 | ||
9b473de8 RR |
640 | static void __init kernel_add_sysfs_param(const char *name, |
641 | struct kernel_param *kparam, | |
642 | unsigned int name_skip) | |
1da177e4 LT |
643 | { |
644 | struct module_kobject *mk; | |
9b473de8 RR |
645 | struct kobject *kobj; |
646 | int err; | |
1da177e4 | 647 | |
9b473de8 RR |
648 | kobj = kset_find_obj(module_kset, name); |
649 | if (kobj) { | |
650 | /* We already have one. Remove params so we can add more. */ | |
651 | mk = to_module_kobject(kobj); | |
652 | /* We need to remove it before adding parameters. */ | |
653 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); | |
654 | } else { | |
655 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
656 | BUG_ON(!mk); | |
657 | ||
658 | mk->mod = THIS_MODULE; | |
659 | mk->kobj.kset = module_kset; | |
660 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, | |
661 | "%s", name); | |
662 | if (err) { | |
663 | kobject_put(&mk->kobj); | |
664 | printk(KERN_ERR "Module '%s' failed add to sysfs, " | |
665 | "error number %d\n", name, err); | |
666 | printk(KERN_ERR "The system will be unstable now.\n"); | |
667 | return; | |
668 | } | |
669 | /* So that exit path is even. */ | |
670 | kobject_get(&mk->kobj); | |
74c5b597 | 671 | } |
9b473de8 RR |
672 | |
673 | /* These should not fail at boot. */ | |
674 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); | |
675 | BUG_ON(err); | |
676 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); | |
677 | BUG_ON(err); | |
f30c53a8 | 678 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
9b473de8 | 679 | kobject_put(&mk->kobj); |
1da177e4 LT |
680 | } |
681 | ||
682 | /* | |
683 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
684 | * | |
685 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
686 | * | |
687 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
688 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
689 | * extract the "module" name for all built-in kernel_param-eters, | |
9b473de8 | 690 | * and for all who have the same, call kernel_add_sysfs_param. |
1da177e4 LT |
691 | */ |
692 | static void __init param_sysfs_builtin(void) | |
693 | { | |
9b473de8 RR |
694 | struct kernel_param *kp; |
695 | unsigned int name_len; | |
696 | char modname[MODULE_NAME_LEN]; | |
1da177e4 | 697 | |
9b473de8 | 698 | for (kp = __start___param; kp < __stop___param; kp++) { |
1da177e4 LT |
699 | char *dot; |
700 | ||
9b473de8 RR |
701 | if (kp->perm == 0) |
702 | continue; | |
1da177e4 | 703 | |
730b69d2 | 704 | dot = strchr(kp->name, '.'); |
1da177e4 | 705 | if (!dot) { |
67e67cea RR |
706 | /* This happens for core_param() */ |
707 | strcpy(modname, "kernel"); | |
708 | name_len = 0; | |
709 | } else { | |
710 | name_len = dot - kp->name + 1; | |
711 | strlcpy(modname, kp->name, name_len); | |
1da177e4 | 712 | } |
67e67cea | 713 | kernel_add_sysfs_param(modname, kp, name_len); |
1da177e4 | 714 | } |
1da177e4 LT |
715 | } |
716 | ||
717 | ||
718 | /* module-related sysfs stuff */ | |
1da177e4 | 719 | |
1da177e4 LT |
720 | static ssize_t module_attr_show(struct kobject *kobj, |
721 | struct attribute *attr, | |
722 | char *buf) | |
723 | { | |
724 | struct module_attribute *attribute; | |
725 | struct module_kobject *mk; | |
726 | int ret; | |
727 | ||
728 | attribute = to_module_attr(attr); | |
729 | mk = to_module_kobject(kobj); | |
730 | ||
731 | if (!attribute->show) | |
70f2817a | 732 | return -EIO; |
1da177e4 | 733 | |
1da177e4 LT |
734 | ret = attribute->show(attribute, mk->mod, buf); |
735 | ||
1da177e4 LT |
736 | return ret; |
737 | } | |
738 | ||
739 | static ssize_t module_attr_store(struct kobject *kobj, | |
740 | struct attribute *attr, | |
741 | const char *buf, size_t len) | |
742 | { | |
743 | struct module_attribute *attribute; | |
744 | struct module_kobject *mk; | |
745 | int ret; | |
746 | ||
747 | attribute = to_module_attr(attr); | |
748 | mk = to_module_kobject(kobj); | |
749 | ||
750 | if (!attribute->store) | |
70f2817a | 751 | return -EIO; |
1da177e4 | 752 | |
1da177e4 LT |
753 | ret = attribute->store(attribute, mk->mod, buf, len); |
754 | ||
1da177e4 LT |
755 | return ret; |
756 | } | |
757 | ||
52cf25d0 | 758 | static const struct sysfs_ops module_sysfs_ops = { |
1da177e4 LT |
759 | .show = module_attr_show, |
760 | .store = module_attr_store, | |
761 | }; | |
762 | ||
270a6c4c KS |
763 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
764 | { | |
765 | struct kobj_type *ktype = get_ktype(kobj); | |
766 | ||
767 | if (ktype == &module_ktype) | |
768 | return 1; | |
769 | return 0; | |
770 | } | |
771 | ||
9cd43611 | 772 | static const struct kset_uevent_ops module_uevent_ops = { |
270a6c4c KS |
773 | .filter = uevent_filter, |
774 | }; | |
775 | ||
7405c1e1 | 776 | struct kset *module_kset; |
823bccfc | 777 | int module_sysfs_initialized; |
1da177e4 | 778 | |
7405c1e1 | 779 | struct kobj_type module_ktype = { |
1da177e4 LT |
780 | .sysfs_ops = &module_sysfs_ops, |
781 | }; | |
782 | ||
1da177e4 LT |
783 | /* |
784 | * param_sysfs_init - wrapper for built-in params support | |
785 | */ | |
786 | static int __init param_sysfs_init(void) | |
787 | { | |
7405c1e1 GKH |
788 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
789 | if (!module_kset) { | |
790 | printk(KERN_WARNING "%s (%d): error creating kset\n", | |
791 | __FILE__, __LINE__); | |
792 | return -ENOMEM; | |
d8c7649e | 793 | } |
823bccfc | 794 | module_sysfs_initialized = 1; |
1da177e4 LT |
795 | |
796 | param_sysfs_builtin(); | |
797 | ||
798 | return 0; | |
799 | } | |
d10be6d1 | 800 | subsys_initcall(param_sysfs_init); |
1da177e4 | 801 | |
7405c1e1 | 802 | #endif /* CONFIG_SYSFS */ |