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> |
1da177e4 LT |
26 | |
27 | #if 0 | |
28 | #define DEBUGP printk | |
29 | #else | |
30 | #define DEBUGP(fmt, a...) | |
31 | #endif | |
32 | ||
b9e20a92 | 33 | static inline char dash2underscore(char c) |
1da177e4 LT |
34 | { |
35 | if (c == '-') | |
36 | return '_'; | |
37 | return c; | |
38 | } | |
39 | ||
40 | static inline int parameq(const char *input, const char *paramname) | |
41 | { | |
42 | unsigned int i; | |
43 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) | |
44 | if (input[i] == '\0') | |
45 | return 1; | |
46 | return 0; | |
47 | } | |
48 | ||
49 | static int parse_one(char *param, | |
50 | char *val, | |
51 | struct kernel_param *params, | |
52 | unsigned num_params, | |
53 | int (*handle_unknown)(char *param, char *val)) | |
54 | { | |
55 | unsigned int i; | |
56 | ||
57 | /* Find parameter */ | |
58 | for (i = 0; i < num_params; i++) { | |
59 | if (parameq(param, params[i].name)) { | |
60 | DEBUGP("They are equal! Calling %p\n", | |
61 | params[i].set); | |
62 | return params[i].set(val, ¶ms[i]); | |
63 | } | |
64 | } | |
65 | ||
66 | if (handle_unknown) { | |
67 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); | |
68 | return handle_unknown(param, val); | |
69 | } | |
70 | ||
71 | DEBUGP("Unknown argument `%s'\n", param); | |
72 | return -ENOENT; | |
73 | } | |
74 | ||
75 | /* You can use " around spaces, but can't escape ". */ | |
76 | /* Hyphens and underscores equivalent in parameter names. */ | |
77 | static char *next_arg(char *args, char **param, char **val) | |
78 | { | |
79 | unsigned int i, equals = 0; | |
80 | int in_quote = 0, quoted = 0; | |
81 | char *next; | |
82 | ||
1da177e4 LT |
83 | if (*args == '"') { |
84 | args++; | |
85 | in_quote = 1; | |
86 | quoted = 1; | |
87 | } | |
88 | ||
89 | for (i = 0; args[i]; i++) { | |
90 | if (args[i] == ' ' && !in_quote) | |
91 | break; | |
92 | if (equals == 0) { | |
93 | if (args[i] == '=') | |
94 | equals = i; | |
95 | } | |
96 | if (args[i] == '"') | |
97 | in_quote = !in_quote; | |
98 | } | |
99 | ||
100 | *param = args; | |
101 | if (!equals) | |
102 | *val = NULL; | |
103 | else { | |
104 | args[equals] = '\0'; | |
105 | *val = args + equals + 1; | |
106 | ||
107 | /* Don't include quotes in value. */ | |
108 | if (**val == '"') { | |
109 | (*val)++; | |
110 | if (args[i-1] == '"') | |
111 | args[i-1] = '\0'; | |
112 | } | |
113 | if (quoted && args[i-1] == '"') | |
114 | args[i-1] = '\0'; | |
115 | } | |
116 | ||
117 | if (args[i]) { | |
118 | args[i] = '\0'; | |
119 | next = args + i + 1; | |
120 | } else | |
121 | next = args + i; | |
f36462f0 RR |
122 | |
123 | /* Chew up trailing spaces. */ | |
124 | while (*next == ' ') | |
125 | next++; | |
1da177e4 LT |
126 | return next; |
127 | } | |
128 | ||
129 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
130 | int parse_args(const char *name, | |
131 | char *args, | |
132 | struct kernel_param *params, | |
133 | unsigned num, | |
134 | int (*unknown)(char *param, char *val)) | |
135 | { | |
136 | char *param, *val; | |
137 | ||
138 | DEBUGP("Parsing ARGS: %s\n", args); | |
139 | ||
f36462f0 RR |
140 | /* Chew leading spaces */ |
141 | while (*args == ' ') | |
142 | args++; | |
143 | ||
1da177e4 LT |
144 | while (*args) { |
145 | int ret; | |
a416aba6 | 146 | int irq_was_disabled; |
1da177e4 LT |
147 | |
148 | args = next_arg(args, ¶m, &val); | |
a416aba6 | 149 | irq_was_disabled = irqs_disabled(); |
1da177e4 | 150 | ret = parse_one(param, val, params, num, unknown); |
a416aba6 AB |
151 | if (irq_was_disabled && !irqs_disabled()) { |
152 | printk(KERN_WARNING "parse_args(): option '%s' enabled " | |
153 | "irq's!\n", param); | |
154 | } | |
1da177e4 LT |
155 | switch (ret) { |
156 | case -ENOENT: | |
157 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
158 | name, param); | |
159 | return ret; | |
160 | case -ENOSPC: | |
161 | printk(KERN_ERR | |
162 | "%s: `%s' too large for parameter `%s'\n", | |
163 | name, val ?: "", param); | |
164 | return ret; | |
165 | case 0: | |
166 | break; | |
167 | default: | |
168 | printk(KERN_ERR | |
169 | "%s: `%s' invalid for parameter `%s'\n", | |
170 | name, val ?: "", param); | |
171 | return ret; | |
172 | } | |
173 | } | |
174 | ||
175 | /* All parsed OK. */ | |
176 | return 0; | |
177 | } | |
178 | ||
179 | /* Lazy bastard, eh? */ | |
180 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
181 | int param_set_##name(const char *val, struct kernel_param *kp) \ | |
182 | { \ | |
1da177e4 | 183 | tmptype l; \ |
06b2a76d | 184 | int ret; \ |
1da177e4 LT |
185 | \ |
186 | if (!val) return -EINVAL; \ | |
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 | } \ | |
193 | int param_get_##name(char *buffer, struct kernel_param *kp) \ | |
194 | { \ | |
195 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
196 | } | |
197 | ||
06b2a76d YY |
198 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
199 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); | |
200 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); | |
201 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); | |
202 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); | |
203 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); | |
204 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); | |
1da177e4 LT |
205 | |
206 | int param_set_charp(const char *val, struct kernel_param *kp) | |
207 | { | |
208 | if (!val) { | |
209 | printk(KERN_ERR "%s: string parameter expected\n", | |
210 | kp->name); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | if (strlen(val) > 1024) { | |
215 | printk(KERN_ERR "%s: string parameter too long\n", | |
216 | kp->name); | |
217 | return -ENOSPC; | |
218 | } | |
219 | ||
45fcc70c | 220 | if (kp->flags & KPARAM_KMALLOCED) |
e180a6b7 RR |
221 | kfree(*(char **)kp->arg); |
222 | ||
223 | /* This is a hack. We can't need to strdup in early boot, and we | |
224 | * don't need to; this mangled commandline is preserved. */ | |
225 | if (slab_is_available()) { | |
45fcc70c | 226 | kp->flags |= KPARAM_KMALLOCED; |
e180a6b7 RR |
227 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
228 | if (!kp->arg) | |
229 | return -ENOMEM; | |
230 | } else | |
231 | *(const char **)kp->arg = val; | |
232 | ||
1da177e4 LT |
233 | return 0; |
234 | } | |
235 | ||
236 | int param_get_charp(char *buffer, struct kernel_param *kp) | |
237 | { | |
238 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
239 | } | |
240 | ||
241 | int param_set_bool(const char *val, struct kernel_param *kp) | |
242 | { | |
243 | /* No equals means "set"... */ | |
244 | if (!val) val = "1"; | |
245 | ||
246 | /* One of =[yYnN01] */ | |
247 | switch (val[0]) { | |
248 | case 'y': case 'Y': case '1': | |
249 | *(int *)kp->arg = 1; | |
250 | return 0; | |
251 | case 'n': case 'N': case '0': | |
252 | *(int *)kp->arg = 0; | |
253 | return 0; | |
254 | } | |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | int param_get_bool(char *buffer, struct kernel_param *kp) | |
259 | { | |
260 | /* Y and N chosen as being relatively non-coder friendly */ | |
261 | return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N'); | |
262 | } | |
263 | ||
264 | int param_set_invbool(const char *val, struct kernel_param *kp) | |
265 | { | |
266 | int boolval, ret; | |
22e48eaf | 267 | struct kernel_param dummy; |
1da177e4 | 268 | |
22e48eaf | 269 | dummy.arg = &boolval; |
1da177e4 LT |
270 | ret = param_set_bool(val, &dummy); |
271 | if (ret == 0) | |
9a71af2c | 272 | *(bool *)kp->arg = !boolval; |
1da177e4 LT |
273 | return ret; |
274 | } | |
275 | ||
276 | int param_get_invbool(char *buffer, struct kernel_param *kp) | |
277 | { | |
9a71af2c | 278 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
1da177e4 LT |
279 | } |
280 | ||
9730b5b0 | 281 | /* We break the rule and mangle the string. */ |
9871728b AB |
282 | static int param_array(const char *name, |
283 | const char *val, | |
284 | unsigned int min, unsigned int max, | |
285 | void *elem, int elemsize, | |
286 | int (*set)(const char *, struct kernel_param *kp), | |
eb38a996 | 287 | unsigned int *num) |
1da177e4 LT |
288 | { |
289 | int ret; | |
290 | struct kernel_param kp; | |
291 | char save; | |
292 | ||
293 | /* Get the name right for errors. */ | |
294 | kp.name = name; | |
295 | kp.arg = elem; | |
296 | ||
297 | /* No equals sign? */ | |
298 | if (!val) { | |
299 | printk(KERN_ERR "%s: expects arguments\n", name); | |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | *num = 0; | |
304 | /* We expect a comma-separated list of values. */ | |
305 | do { | |
306 | int len; | |
307 | ||
308 | if (*num == max) { | |
309 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
310 | name, max); | |
311 | return -EINVAL; | |
312 | } | |
313 | len = strcspn(val, ","); | |
314 | ||
315 | /* nul-terminate and parse */ | |
316 | save = val[len]; | |
317 | ((char *)val)[len] = '\0'; | |
318 | ret = set(val, &kp); | |
319 | ||
320 | if (ret != 0) | |
321 | return ret; | |
322 | kp.arg += elemsize; | |
323 | val += len+1; | |
324 | (*num)++; | |
325 | } while (save == ','); | |
326 | ||
327 | if (*num < min) { | |
328 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
329 | name, min); | |
330 | return -EINVAL; | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
335 | int param_array_set(const char *val, struct kernel_param *kp) | |
336 | { | |
22e48eaf | 337 | const struct kparam_array *arr = kp->arr; |
31143a12 | 338 | unsigned int temp_num; |
1da177e4 LT |
339 | |
340 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
31143a12 | 341 | arr->elemsize, arr->set, arr->num ?: &temp_num); |
1da177e4 LT |
342 | } |
343 | ||
344 | int param_array_get(char *buffer, struct kernel_param *kp) | |
345 | { | |
346 | int i, off, ret; | |
22e48eaf | 347 | const struct kparam_array *arr = kp->arr; |
1da177e4 LT |
348 | struct kernel_param p; |
349 | ||
350 | p = *kp; | |
351 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
352 | if (i) | |
353 | buffer[off++] = ','; | |
354 | p.arg = arr->elem + arr->elemsize * i; | |
355 | ret = arr->get(buffer + off, &p); | |
356 | if (ret < 0) | |
357 | return ret; | |
358 | off += ret; | |
359 | } | |
360 | buffer[off] = '\0'; | |
361 | return off; | |
362 | } | |
363 | ||
364 | int param_set_copystring(const char *val, struct kernel_param *kp) | |
365 | { | |
22e48eaf | 366 | const struct kparam_string *kps = kp->str; |
1da177e4 | 367 | |
fe20e581 RD |
368 | if (!val) { |
369 | printk(KERN_ERR "%s: missing param set value\n", kp->name); | |
370 | return -EINVAL; | |
371 | } | |
1da177e4 LT |
372 | if (strlen(val)+1 > kps->maxlen) { |
373 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
374 | kp->name, kps->maxlen-1); | |
375 | return -ENOSPC; | |
376 | } | |
377 | strcpy(kps->string, val); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | int param_get_string(char *buffer, struct kernel_param *kp) | |
382 | { | |
22e48eaf | 383 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
384 | return strlcpy(buffer, kps->string, kps->maxlen); |
385 | } | |
386 | ||
387 | /* sysfs output in /sys/modules/XYZ/parameters/ */ | |
9b473de8 RR |
388 | #define to_module_attr(n) container_of(n, struct module_attribute, attr); |
389 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); | |
1da177e4 LT |
390 | |
391 | extern struct kernel_param __start___param[], __stop___param[]; | |
392 | ||
1da177e4 LT |
393 | struct param_attribute |
394 | { | |
395 | struct module_attribute mattr; | |
396 | struct kernel_param *param; | |
397 | }; | |
398 | ||
399 | struct module_param_attrs | |
400 | { | |
9b473de8 | 401 | unsigned int num; |
1da177e4 LT |
402 | struct attribute_group grp; |
403 | struct param_attribute attrs[0]; | |
404 | }; | |
405 | ||
ef665c1a | 406 | #ifdef CONFIG_SYSFS |
1da177e4 LT |
407 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr); |
408 | ||
409 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
410 | struct module *mod, char *buf) | |
411 | { | |
412 | int count; | |
413 | struct param_attribute *attribute = to_param_attr(mattr); | |
414 | ||
415 | if (!attribute->param->get) | |
416 | return -EPERM; | |
417 | ||
418 | count = attribute->param->get(buf, attribute->param); | |
419 | if (count > 0) { | |
420 | strcat(buf, "\n"); | |
421 | ++count; | |
422 | } | |
423 | return count; | |
424 | } | |
425 | ||
426 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
427 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
428 | struct module *owner, | |
429 | const char *buf, size_t len) | |
430 | { | |
431 | int err; | |
432 | struct param_attribute *attribute = to_param_attr(mattr); | |
433 | ||
434 | if (!attribute->param->set) | |
435 | return -EPERM; | |
436 | ||
437 | err = attribute->param->set(buf, attribute->param); | |
438 | if (!err) | |
439 | return len; | |
440 | return err; | |
441 | } | |
ef665c1a | 442 | #endif |
1da177e4 LT |
443 | |
444 | #ifdef CONFIG_MODULES | |
445 | #define __modinit | |
446 | #else | |
447 | #define __modinit __init | |
448 | #endif | |
449 | ||
ef665c1a | 450 | #ifdef CONFIG_SYSFS |
1da177e4 | 451 | /* |
9b473de8 RR |
452 | * add_sysfs_param - add a parameter to sysfs |
453 | * @mk: struct module_kobject | |
454 | * @kparam: the actual parameter definition to add to sysfs | |
455 | * @name: name of parameter | |
1da177e4 | 456 | * |
9b473de8 RR |
457 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
458 | * create file in sysfs. Returns an error on out of memory. Always cleans up | |
459 | * if there's an error. | |
1da177e4 | 460 | */ |
9b473de8 RR |
461 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
462 | struct kernel_param *kp, | |
463 | const char *name) | |
1da177e4 | 464 | { |
9b473de8 RR |
465 | struct module_param_attrs *new; |
466 | struct attribute **attrs; | |
467 | int err, num; | |
468 | ||
469 | /* We don't bother calling this with invisible parameters. */ | |
470 | BUG_ON(!kp->perm); | |
471 | ||
472 | if (!mk->mp) { | |
473 | num = 0; | |
474 | attrs = NULL; | |
475 | } else { | |
476 | num = mk->mp->num; | |
477 | attrs = mk->mp->grp.attrs; | |
1da177e4 LT |
478 | } |
479 | ||
9b473de8 RR |
480 | /* Enlarge. */ |
481 | new = krealloc(mk->mp, | |
482 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), | |
483 | GFP_KERNEL); | |
484 | if (!new) { | |
485 | kfree(mk->mp); | |
486 | err = -ENOMEM; | |
487 | goto fail; | |
488 | } | |
489 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); | |
490 | if (!attrs) { | |
491 | err = -ENOMEM; | |
492 | goto fail_free_new; | |
493 | } | |
1da177e4 | 494 | |
9b473de8 RR |
495 | /* Sysfs wants everything zeroed. */ |
496 | memset(new, 0, sizeof(*new)); | |
497 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); | |
498 | memset(&attrs[num], 0, sizeof(attrs[num])); | |
499 | new->grp.name = "parameters"; | |
500 | new->grp.attrs = attrs; | |
501 | ||
502 | /* Tack new one on the end. */ | |
503 | new->attrs[num].param = kp; | |
504 | new->attrs[num].mattr.show = param_attr_show; | |
505 | new->attrs[num].mattr.store = param_attr_store; | |
506 | new->attrs[num].mattr.attr.name = (char *)name; | |
507 | new->attrs[num].mattr.attr.mode = kp->perm; | |
508 | new->num = num+1; | |
509 | ||
510 | /* Fix up all the pointers, since krealloc can move us */ | |
511 | for (num = 0; num < new->num; num++) | |
512 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; | |
513 | new->grp.attrs[num] = NULL; | |
514 | ||
515 | mk->mp = new; | |
516 | return 0; | |
1da177e4 | 517 | |
9b473de8 RR |
518 | fail_free_new: |
519 | kfree(new); | |
520 | fail: | |
521 | mk->mp = NULL; | |
522 | return err; | |
523 | } | |
1da177e4 | 524 | |
d2441183 | 525 | #ifdef CONFIG_MODULES |
9b473de8 RR |
526 | static void free_module_param_attrs(struct module_kobject *mk) |
527 | { | |
528 | kfree(mk->mp->grp.attrs); | |
529 | kfree(mk->mp); | |
530 | mk->mp = NULL; | |
1da177e4 LT |
531 | } |
532 | ||
1da177e4 LT |
533 | /* |
534 | * module_param_sysfs_setup - setup sysfs support for one module | |
535 | * @mod: module | |
536 | * @kparam: module parameters (array) | |
537 | * @num_params: number of module parameters | |
538 | * | |
9b473de8 RR |
539 | * Adds sysfs entries for module parameters under |
540 | * /sys/module/[mod->name]/parameters/ | |
1da177e4 LT |
541 | */ |
542 | int module_param_sysfs_setup(struct module *mod, | |
543 | struct kernel_param *kparam, | |
544 | unsigned int num_params) | |
545 | { | |
9b473de8 RR |
546 | int i, err; |
547 | bool params = false; | |
548 | ||
549 | for (i = 0; i < num_params; i++) { | |
550 | if (kparam[i].perm == 0) | |
551 | continue; | |
552 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); | |
553 | if (err) | |
554 | return err; | |
555 | params = true; | |
556 | } | |
1da177e4 | 557 | |
9b473de8 RR |
558 | if (!params) |
559 | return 0; | |
1da177e4 | 560 | |
9b473de8 RR |
561 | /* Create the param group. */ |
562 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
563 | if (err) | |
564 | free_module_param_attrs(&mod->mkobj); | |
565 | return err; | |
1da177e4 LT |
566 | } |
567 | ||
568 | /* | |
569 | * module_param_sysfs_remove - remove sysfs support for one module | |
570 | * @mod: module | |
571 | * | |
572 | * Remove sysfs entries for module parameters and the corresponding | |
573 | * kobject. | |
574 | */ | |
575 | void module_param_sysfs_remove(struct module *mod) | |
576 | { | |
9b473de8 RR |
577 | if (mod->mkobj.mp) { |
578 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
1da177e4 LT |
579 | /* We are positive that no one is using any param |
580 | * attrs at this point. Deallocate immediately. */ | |
9b473de8 | 581 | free_module_param_attrs(&mod->mkobj); |
1da177e4 LT |
582 | } |
583 | } | |
584 | #endif | |
585 | ||
e180a6b7 RR |
586 | void destroy_params(const struct kernel_param *params, unsigned num) |
587 | { | |
588 | unsigned int i; | |
589 | ||
590 | for (i = 0; i < num; i++) | |
45fcc70c | 591 | if (params[i].flags & KPARAM_KMALLOCED) |
e180a6b7 RR |
592 | kfree(*(char **)params[i].arg); |
593 | } | |
594 | ||
9b473de8 RR |
595 | static void __init kernel_add_sysfs_param(const char *name, |
596 | struct kernel_param *kparam, | |
597 | unsigned int name_skip) | |
1da177e4 LT |
598 | { |
599 | struct module_kobject *mk; | |
9b473de8 RR |
600 | struct kobject *kobj; |
601 | int err; | |
1da177e4 | 602 | |
9b473de8 RR |
603 | kobj = kset_find_obj(module_kset, name); |
604 | if (kobj) { | |
605 | /* We already have one. Remove params so we can add more. */ | |
606 | mk = to_module_kobject(kobj); | |
607 | /* We need to remove it before adding parameters. */ | |
608 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); | |
609 | } else { | |
610 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
611 | BUG_ON(!mk); | |
612 | ||
613 | mk->mod = THIS_MODULE; | |
614 | mk->kobj.kset = module_kset; | |
615 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, | |
616 | "%s", name); | |
617 | if (err) { | |
618 | kobject_put(&mk->kobj); | |
619 | printk(KERN_ERR "Module '%s' failed add to sysfs, " | |
620 | "error number %d\n", name, err); | |
621 | printk(KERN_ERR "The system will be unstable now.\n"); | |
622 | return; | |
623 | } | |
624 | /* So that exit path is even. */ | |
625 | kobject_get(&mk->kobj); | |
74c5b597 | 626 | } |
9b473de8 RR |
627 | |
628 | /* These should not fail at boot. */ | |
629 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); | |
630 | BUG_ON(err); | |
631 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); | |
632 | BUG_ON(err); | |
f30c53a8 | 633 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
9b473de8 | 634 | kobject_put(&mk->kobj); |
1da177e4 LT |
635 | } |
636 | ||
637 | /* | |
638 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
639 | * | |
640 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
641 | * | |
642 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
643 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
644 | * extract the "module" name for all built-in kernel_param-eters, | |
9b473de8 | 645 | * and for all who have the same, call kernel_add_sysfs_param. |
1da177e4 LT |
646 | */ |
647 | static void __init param_sysfs_builtin(void) | |
648 | { | |
9b473de8 RR |
649 | struct kernel_param *kp; |
650 | unsigned int name_len; | |
651 | char modname[MODULE_NAME_LEN]; | |
1da177e4 | 652 | |
9b473de8 | 653 | for (kp = __start___param; kp < __stop___param; kp++) { |
1da177e4 LT |
654 | char *dot; |
655 | ||
9b473de8 RR |
656 | if (kp->perm == 0) |
657 | continue; | |
1da177e4 | 658 | |
730b69d2 | 659 | dot = strchr(kp->name, '.'); |
1da177e4 | 660 | if (!dot) { |
67e67cea RR |
661 | /* This happens for core_param() */ |
662 | strcpy(modname, "kernel"); | |
663 | name_len = 0; | |
664 | } else { | |
665 | name_len = dot - kp->name + 1; | |
666 | strlcpy(modname, kp->name, name_len); | |
1da177e4 | 667 | } |
67e67cea | 668 | kernel_add_sysfs_param(modname, kp, name_len); |
1da177e4 | 669 | } |
1da177e4 LT |
670 | } |
671 | ||
672 | ||
673 | /* module-related sysfs stuff */ | |
1da177e4 | 674 | |
1da177e4 LT |
675 | static ssize_t module_attr_show(struct kobject *kobj, |
676 | struct attribute *attr, | |
677 | char *buf) | |
678 | { | |
679 | struct module_attribute *attribute; | |
680 | struct module_kobject *mk; | |
681 | int ret; | |
682 | ||
683 | attribute = to_module_attr(attr); | |
684 | mk = to_module_kobject(kobj); | |
685 | ||
686 | if (!attribute->show) | |
70f2817a | 687 | return -EIO; |
1da177e4 | 688 | |
1da177e4 LT |
689 | ret = attribute->show(attribute, mk->mod, buf); |
690 | ||
1da177e4 LT |
691 | return ret; |
692 | } | |
693 | ||
694 | static ssize_t module_attr_store(struct kobject *kobj, | |
695 | struct attribute *attr, | |
696 | const char *buf, size_t len) | |
697 | { | |
698 | struct module_attribute *attribute; | |
699 | struct module_kobject *mk; | |
700 | int ret; | |
701 | ||
702 | attribute = to_module_attr(attr); | |
703 | mk = to_module_kobject(kobj); | |
704 | ||
705 | if (!attribute->store) | |
70f2817a | 706 | return -EIO; |
1da177e4 | 707 | |
1da177e4 LT |
708 | ret = attribute->store(attribute, mk->mod, buf, len); |
709 | ||
1da177e4 LT |
710 | return ret; |
711 | } | |
712 | ||
713 | static struct sysfs_ops module_sysfs_ops = { | |
714 | .show = module_attr_show, | |
715 | .store = module_attr_store, | |
716 | }; | |
717 | ||
270a6c4c KS |
718 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
719 | { | |
720 | struct kobj_type *ktype = get_ktype(kobj); | |
721 | ||
722 | if (ktype == &module_ktype) | |
723 | return 1; | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static struct kset_uevent_ops module_uevent_ops = { | |
728 | .filter = uevent_filter, | |
729 | }; | |
730 | ||
7405c1e1 | 731 | struct kset *module_kset; |
823bccfc | 732 | int module_sysfs_initialized; |
1da177e4 | 733 | |
7405c1e1 | 734 | struct kobj_type module_ktype = { |
1da177e4 LT |
735 | .sysfs_ops = &module_sysfs_ops, |
736 | }; | |
737 | ||
1da177e4 LT |
738 | /* |
739 | * param_sysfs_init - wrapper for built-in params support | |
740 | */ | |
741 | static int __init param_sysfs_init(void) | |
742 | { | |
7405c1e1 GKH |
743 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
744 | if (!module_kset) { | |
745 | printk(KERN_WARNING "%s (%d): error creating kset\n", | |
746 | __FILE__, __LINE__); | |
747 | return -ENOMEM; | |
d8c7649e | 748 | } |
823bccfc | 749 | module_sysfs_initialized = 1; |
1da177e4 LT |
750 | |
751 | param_sysfs_builtin(); | |
752 | ||
753 | return 0; | |
754 | } | |
d10be6d1 | 755 | subsys_initcall(param_sysfs_init); |
1da177e4 | 756 | |
7405c1e1 | 757 | #endif /* CONFIG_SYSFS */ |
ef665c1a | 758 | |
1da177e4 LT |
759 | EXPORT_SYMBOL(param_set_byte); |
760 | EXPORT_SYMBOL(param_get_byte); | |
761 | EXPORT_SYMBOL(param_set_short); | |
762 | EXPORT_SYMBOL(param_get_short); | |
763 | EXPORT_SYMBOL(param_set_ushort); | |
764 | EXPORT_SYMBOL(param_get_ushort); | |
765 | EXPORT_SYMBOL(param_set_int); | |
766 | EXPORT_SYMBOL(param_get_int); | |
767 | EXPORT_SYMBOL(param_set_uint); | |
768 | EXPORT_SYMBOL(param_get_uint); | |
769 | EXPORT_SYMBOL(param_set_long); | |
770 | EXPORT_SYMBOL(param_get_long); | |
771 | EXPORT_SYMBOL(param_set_ulong); | |
772 | EXPORT_SYMBOL(param_get_ulong); | |
773 | EXPORT_SYMBOL(param_set_charp); | |
774 | EXPORT_SYMBOL(param_get_charp); | |
775 | EXPORT_SYMBOL(param_set_bool); | |
776 | EXPORT_SYMBOL(param_get_bool); | |
777 | EXPORT_SYMBOL(param_set_invbool); | |
778 | EXPORT_SYMBOL(param_get_invbool); | |
779 | EXPORT_SYMBOL(param_array_set); | |
780 | EXPORT_SYMBOL(param_array_get); | |
781 | EXPORT_SYMBOL(param_set_copystring); | |
782 | EXPORT_SYMBOL(param_get_string); |