Root/
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 | */ |
18 | #include <linux/module.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> |
25 | #include <linux/slab.h> |
26 | #include <linux/ctype.h> |
27 | |
28 | /* Protects all parameters, and incidentally kmalloced_param list. */ |
29 | static DEFINE_MUTEX(param_lock); |
30 | |
31 | /* This just allows us to keep track of which parameters are kmalloced. */ |
32 | struct kmalloced_param { |
33 | struct list_head list; |
34 | char val[]; |
35 | }; |
36 | static LIST_HEAD(kmalloced_params); |
37 | |
38 | static void *kmalloc_parameter(unsigned int size) |
39 | { |
40 | struct kmalloced_param *p; |
41 | |
42 | p = kmalloc(sizeof(*p) + size, GFP_KERNEL); |
43 | if (!p) |
44 | return NULL; |
45 | |
46 | list_add(&p->list, &kmalloced_params); |
47 | return p->val; |
48 | } |
49 | |
50 | /* Does nothing if parameter wasn't kmalloced above. */ |
51 | static void maybe_kfree_parameter(void *param) |
52 | { |
53 | struct kmalloced_param *p; |
54 | |
55 | list_for_each_entry(p, &kmalloced_params, list) { |
56 | if (p->val == param) { |
57 | list_del(&p->list); |
58 | kfree(p); |
59 | break; |
60 | } |
61 | } |
62 | } |
63 | |
64 | static char dash2underscore(char c) |
65 | { |
66 | if (c == '-') |
67 | return '_'; |
68 | return c; |
69 | } |
70 | |
71 | bool parameqn(const char *a, const char *b, size_t n) |
72 | { |
73 | size_t i; |
74 | |
75 | for (i = 0; i < n; i++) { |
76 | if (dash2underscore(a[i]) != dash2underscore(b[i])) |
77 | return false; |
78 | } |
79 | return true; |
80 | } |
81 | |
82 | bool parameq(const char *a, const char *b) |
83 | { |
84 | return parameqn(a, b, strlen(a)+1); |
85 | } |
86 | |
87 | static int parse_one(char *param, |
88 | char *val, |
89 | const struct kernel_param *params, |
90 | unsigned num_params, |
91 | int (*handle_unknown)(char *param, char *val)) |
92 | { |
93 | unsigned int i; |
94 | int err; |
95 | |
96 | /* Find parameter */ |
97 | for (i = 0; i < num_params; i++) { |
98 | if (parameq(param, params[i].name)) { |
99 | /* No one handled NULL, so do it here. */ |
100 | if (!val && params[i].ops->set != param_set_bool |
101 | && params[i].ops->set != param_set_bint) |
102 | return -EINVAL; |
103 | pr_debug("They are equal! Calling %p\n", |
104 | params[i].ops->set); |
105 | mutex_lock(¶m_lock); |
106 | err = params[i].ops->set(val, ¶ms[i]); |
107 | mutex_unlock(¶m_lock); |
108 | return err; |
109 | } |
110 | } |
111 | |
112 | if (handle_unknown) { |
113 | pr_debug("Unknown argument: calling %p\n", handle_unknown); |
114 | return handle_unknown(param, val); |
115 | } |
116 | |
117 | pr_debug("Unknown argument `%s'\n", param); |
118 | return -ENOENT; |
119 | } |
120 | |
121 | /* You can use " around spaces, but can't escape ". */ |
122 | /* Hyphens and underscores equivalent in parameter names. */ |
123 | static char *next_arg(char *args, char **param, char **val) |
124 | { |
125 | unsigned int i, equals = 0; |
126 | int in_quote = 0, quoted = 0; |
127 | char *next; |
128 | |
129 | if (*args == '"') { |
130 | args++; |
131 | in_quote = 1; |
132 | quoted = 1; |
133 | } |
134 | |
135 | for (i = 0; args[i]; i++) { |
136 | if (isspace(args[i]) && !in_quote) |
137 | break; |
138 | if (equals == 0) { |
139 | if (args[i] == '=') |
140 | equals = i; |
141 | } |
142 | if (args[i] == '"') |
143 | in_quote = !in_quote; |
144 | } |
145 | |
146 | *param = args; |
147 | if (!equals) |
148 | *val = NULL; |
149 | else { |
150 | args[equals] = '\0'; |
151 | *val = args + equals + 1; |
152 | |
153 | /* Don't include quotes in value. */ |
154 | if (**val == '"') { |
155 | (*val)++; |
156 | if (args[i-1] == '"') |
157 | args[i-1] = '\0'; |
158 | } |
159 | if (quoted && args[i-1] == '"') |
160 | args[i-1] = '\0'; |
161 | } |
162 | |
163 | if (args[i]) { |
164 | args[i] = '\0'; |
165 | next = args + i + 1; |
166 | } else |
167 | next = args + i; |
168 | |
169 | /* Chew up trailing spaces. */ |
170 | return skip_spaces(next); |
171 | } |
172 | |
173 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
174 | int parse_args(const char *name, |
175 | char *args, |
176 | const struct kernel_param *params, |
177 | unsigned num, |
178 | int (*unknown)(char *param, char *val)) |
179 | { |
180 | char *param, *val; |
181 | |
182 | pr_debug("Parsing ARGS: %s\n", args); |
183 | |
184 | /* Chew leading spaces */ |
185 | args = skip_spaces(args); |
186 | |
187 | while (*args) { |
188 | int ret; |
189 | int irq_was_disabled; |
190 | |
191 | args = next_arg(args, ¶m, &val); |
192 | irq_was_disabled = irqs_disabled(); |
193 | ret = parse_one(param, val, params, num, unknown); |
194 | if (irq_was_disabled && !irqs_disabled()) { |
195 | printk(KERN_WARNING "parse_args(): option '%s' enabled " |
196 | "irq's!\n", param); |
197 | } |
198 | switch (ret) { |
199 | case -ENOENT: |
200 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", |
201 | name, param); |
202 | return ret; |
203 | case -ENOSPC: |
204 | printk(KERN_ERR |
205 | "%s: `%s' too large for parameter `%s'\n", |
206 | name, val ?: "", param); |
207 | return ret; |
208 | case 0: |
209 | break; |
210 | default: |
211 | printk(KERN_ERR |
212 | "%s: `%s' invalid for parameter `%s'\n", |
213 | name, val ?: "", param); |
214 | return ret; |
215 | } |
216 | } |
217 | |
218 | /* All parsed OK. */ |
219 | return 0; |
220 | } |
221 | |
222 | /* Lazy bastard, eh? */ |
223 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ |
224 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
225 | { \ |
226 | tmptype l; \ |
227 | int ret; \ |
228 | \ |
229 | ret = strtolfn(val, 0, &l); \ |
230 | if (ret < 0 || ((type)l != l)) \ |
231 | return ret < 0 ? ret : -EINVAL; \ |
232 | *((type *)kp->arg) = l; \ |
233 | return 0; \ |
234 | } \ |
235 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
236 | { \ |
237 | return sprintf(buffer, format, *((type *)kp->arg)); \ |
238 | } \ |
239 | struct kernel_param_ops param_ops_##name = { \ |
240 | .set = param_set_##name, \ |
241 | .get = param_get_##name, \ |
242 | }; \ |
243 | EXPORT_SYMBOL(param_set_##name); \ |
244 | EXPORT_SYMBOL(param_get_##name); \ |
245 | EXPORT_SYMBOL(param_ops_##name) |
246 | |
247 | |
248 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
249 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); |
250 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); |
251 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); |
252 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); |
253 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); |
254 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); |
255 | |
256 | int param_set_charp(const char *val, const struct kernel_param *kp) |
257 | { |
258 | if (strlen(val) > 1024) { |
259 | printk(KERN_ERR "%s: string parameter too long\n", |
260 | kp->name); |
261 | return -ENOSPC; |
262 | } |
263 | |
264 | maybe_kfree_parameter(*(char **)kp->arg); |
265 | |
266 | /* This is a hack. We can't kmalloc in early boot, and we |
267 | * don't need to; this mangled commandline is preserved. */ |
268 | if (slab_is_available()) { |
269 | *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
270 | if (!*(char **)kp->arg) |
271 | return -ENOMEM; |
272 | strcpy(*(char **)kp->arg, val); |
273 | } else |
274 | *(const char **)kp->arg = val; |
275 | |
276 | return 0; |
277 | } |
278 | EXPORT_SYMBOL(param_set_charp); |
279 | |
280 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
281 | { |
282 | return sprintf(buffer, "%s", *((char **)kp->arg)); |
283 | } |
284 | EXPORT_SYMBOL(param_get_charp); |
285 | |
286 | static void param_free_charp(void *arg) |
287 | { |
288 | maybe_kfree_parameter(*((char **)arg)); |
289 | } |
290 | |
291 | struct kernel_param_ops param_ops_charp = { |
292 | .set = param_set_charp, |
293 | .get = param_get_charp, |
294 | .free = param_free_charp, |
295 | }; |
296 | EXPORT_SYMBOL(param_ops_charp); |
297 | |
298 | /* Actually could be a bool or an int, for historical reasons. */ |
299 | int param_set_bool(const char *val, const struct kernel_param *kp) |
300 | { |
301 | bool v; |
302 | int ret; |
303 | |
304 | /* No equals means "set"... */ |
305 | if (!val) val = "1"; |
306 | |
307 | /* One of =[yYnN01] */ |
308 | ret = strtobool(val, &v); |
309 | if (ret) |
310 | return ret; |
311 | |
312 | if (kp->flags & KPARAM_ISBOOL) |
313 | *(bool *)kp->arg = v; |
314 | else |
315 | *(int *)kp->arg = v; |
316 | return 0; |
317 | } |
318 | EXPORT_SYMBOL(param_set_bool); |
319 | |
320 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
321 | { |
322 | bool val; |
323 | if (kp->flags & KPARAM_ISBOOL) |
324 | val = *(bool *)kp->arg; |
325 | else |
326 | val = *(int *)kp->arg; |
327 | |
328 | /* Y and N chosen as being relatively non-coder friendly */ |
329 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
330 | } |
331 | EXPORT_SYMBOL(param_get_bool); |
332 | |
333 | struct kernel_param_ops param_ops_bool = { |
334 | .set = param_set_bool, |
335 | .get = param_get_bool, |
336 | }; |
337 | EXPORT_SYMBOL(param_ops_bool); |
338 | |
339 | /* This one must be bool. */ |
340 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
341 | { |
342 | int ret; |
343 | bool boolval; |
344 | struct kernel_param dummy; |
345 | |
346 | dummy.arg = &boolval; |
347 | dummy.flags = KPARAM_ISBOOL; |
348 | ret = param_set_bool(val, &dummy); |
349 | if (ret == 0) |
350 | *(bool *)kp->arg = !boolval; |
351 | return ret; |
352 | } |
353 | EXPORT_SYMBOL(param_set_invbool); |
354 | |
355 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
356 | { |
357 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
358 | } |
359 | EXPORT_SYMBOL(param_get_invbool); |
360 | |
361 | struct kernel_param_ops param_ops_invbool = { |
362 | .set = param_set_invbool, |
363 | .get = param_get_invbool, |
364 | }; |
365 | EXPORT_SYMBOL(param_ops_invbool); |
366 | |
367 | int param_set_bint(const char *val, const struct kernel_param *kp) |
368 | { |
369 | struct kernel_param boolkp; |
370 | bool v; |
371 | int ret; |
372 | |
373 | /* Match bool exactly, by re-using it. */ |
374 | boolkp = *kp; |
375 | boolkp.arg = &v; |
376 | boolkp.flags |= KPARAM_ISBOOL; |
377 | |
378 | ret = param_set_bool(val, &boolkp); |
379 | if (ret == 0) |
380 | *(int *)kp->arg = v; |
381 | return ret; |
382 | } |
383 | EXPORT_SYMBOL(param_set_bint); |
384 | |
385 | struct kernel_param_ops param_ops_bint = { |
386 | .set = param_set_bint, |
387 | .get = param_get_int, |
388 | }; |
389 | EXPORT_SYMBOL(param_ops_bint); |
390 | |
391 | /* We break the rule and mangle the string. */ |
392 | static int param_array(const char *name, |
393 | const char *val, |
394 | unsigned int min, unsigned int max, |
395 | void *elem, int elemsize, |
396 | int (*set)(const char *, const struct kernel_param *kp), |
397 | u16 flags, |
398 | unsigned int *num) |
399 | { |
400 | int ret; |
401 | struct kernel_param kp; |
402 | char save; |
403 | |
404 | /* Get the name right for errors. */ |
405 | kp.name = name; |
406 | kp.arg = elem; |
407 | kp.flags = flags; |
408 | |
409 | *num = 0; |
410 | /* We expect a comma-separated list of values. */ |
411 | do { |
412 | int len; |
413 | |
414 | if (*num == max) { |
415 | printk(KERN_ERR "%s: can only take %i arguments\n", |
416 | name, max); |
417 | return -EINVAL; |
418 | } |
419 | len = strcspn(val, ","); |
420 | |
421 | /* nul-terminate and parse */ |
422 | save = val[len]; |
423 | ((char *)val)[len] = '\0'; |
424 | BUG_ON(!mutex_is_locked(¶m_lock)); |
425 | ret = set(val, &kp); |
426 | |
427 | if (ret != 0) |
428 | return ret; |
429 | kp.arg += elemsize; |
430 | val += len+1; |
431 | (*num)++; |
432 | } while (save == ','); |
433 | |
434 | if (*num < min) { |
435 | printk(KERN_ERR "%s: needs at least %i arguments\n", |
436 | name, min); |
437 | return -EINVAL; |
438 | } |
439 | return 0; |
440 | } |
441 | |
442 | static int param_array_set(const char *val, const struct kernel_param *kp) |
443 | { |
444 | const struct kparam_array *arr = kp->arr; |
445 | unsigned int temp_num; |
446 | |
447 | return param_array(kp->name, val, 1, arr->max, arr->elem, |
448 | arr->elemsize, arr->ops->set, kp->flags, |
449 | arr->num ?: &temp_num); |
450 | } |
451 | |
452 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
453 | { |
454 | int i, off, ret; |
455 | const struct kparam_array *arr = kp->arr; |
456 | struct kernel_param p; |
457 | |
458 | p = *kp; |
459 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
460 | if (i) |
461 | buffer[off++] = ','; |
462 | p.arg = arr->elem + arr->elemsize * i; |
463 | BUG_ON(!mutex_is_locked(¶m_lock)); |
464 | ret = arr->ops->get(buffer + off, &p); |
465 | if (ret < 0) |
466 | return ret; |
467 | off += ret; |
468 | } |
469 | buffer[off] = '\0'; |
470 | return off; |
471 | } |
472 | |
473 | static void param_array_free(void *arg) |
474 | { |
475 | unsigned int i; |
476 | const struct kparam_array *arr = arg; |
477 | |
478 | if (arr->ops->free) |
479 | for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) |
480 | arr->ops->free(arr->elem + arr->elemsize * i); |
481 | } |
482 | |
483 | struct kernel_param_ops param_array_ops = { |
484 | .set = param_array_set, |
485 | .get = param_array_get, |
486 | .free = param_array_free, |
487 | }; |
488 | EXPORT_SYMBOL(param_array_ops); |
489 | |
490 | int param_set_copystring(const char *val, const struct kernel_param *kp) |
491 | { |
492 | const struct kparam_string *kps = kp->str; |
493 | |
494 | if (strlen(val)+1 > kps->maxlen) { |
495 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", |
496 | kp->name, kps->maxlen-1); |
497 | return -ENOSPC; |
498 | } |
499 | strcpy(kps->string, val); |
500 | return 0; |
501 | } |
502 | EXPORT_SYMBOL(param_set_copystring); |
503 | |
504 | int param_get_string(char *buffer, const struct kernel_param *kp) |
505 | { |
506 | const struct kparam_string *kps = kp->str; |
507 | return strlcpy(buffer, kps->string, kps->maxlen); |
508 | } |
509 | EXPORT_SYMBOL(param_get_string); |
510 | |
511 | struct kernel_param_ops param_ops_string = { |
512 | .set = param_set_copystring, |
513 | .get = param_get_string, |
514 | }; |
515 | EXPORT_SYMBOL(param_ops_string); |
516 | |
517 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
518 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
519 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
520 | |
521 | extern struct kernel_param __start___param[], __stop___param[]; |
522 | |
523 | struct param_attribute |
524 | { |
525 | struct module_attribute mattr; |
526 | const struct kernel_param *param; |
527 | }; |
528 | |
529 | struct module_param_attrs |
530 | { |
531 | unsigned int num; |
532 | struct attribute_group grp; |
533 | struct param_attribute attrs[0]; |
534 | }; |
535 | |
536 | #ifdef CONFIG_SYSFS |
537 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
538 | |
539 | static ssize_t param_attr_show(struct module_attribute *mattr, |
540 | struct module_kobject *mk, char *buf) |
541 | { |
542 | int count; |
543 | struct param_attribute *attribute = to_param_attr(mattr); |
544 | |
545 | if (!attribute->param->ops->get) |
546 | return -EPERM; |
547 | |
548 | mutex_lock(¶m_lock); |
549 | count = attribute->param->ops->get(buf, attribute->param); |
550 | mutex_unlock(¶m_lock); |
551 | if (count > 0) { |
552 | strcat(buf, "\n"); |
553 | ++count; |
554 | } |
555 | return count; |
556 | } |
557 | |
558 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
559 | static ssize_t param_attr_store(struct module_attribute *mattr, |
560 | struct module_kobject *km, |
561 | const char *buf, size_t len) |
562 | { |
563 | int err; |
564 | struct param_attribute *attribute = to_param_attr(mattr); |
565 | |
566 | if (!attribute->param->ops->set) |
567 | return -EPERM; |
568 | |
569 | mutex_lock(¶m_lock); |
570 | err = attribute->param->ops->set(buf, attribute->param); |
571 | mutex_unlock(¶m_lock); |
572 | if (!err) |
573 | return len; |
574 | return err; |
575 | } |
576 | #endif |
577 | |
578 | #ifdef CONFIG_MODULES |
579 | #define __modinit |
580 | #else |
581 | #define __modinit __init |
582 | #endif |
583 | |
584 | #ifdef CONFIG_SYSFS |
585 | void __kernel_param_lock(void) |
586 | { |
587 | mutex_lock(¶m_lock); |
588 | } |
589 | EXPORT_SYMBOL(__kernel_param_lock); |
590 | |
591 | void __kernel_param_unlock(void) |
592 | { |
593 | mutex_unlock(¶m_lock); |
594 | } |
595 | EXPORT_SYMBOL(__kernel_param_unlock); |
596 | |
597 | /* |
598 | * add_sysfs_param - add a parameter to sysfs |
599 | * @mk: struct module_kobject |
600 | * @kparam: the actual parameter definition to add to sysfs |
601 | * @name: name of parameter |
602 | * |
603 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
604 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
605 | * if there's an error. |
606 | */ |
607 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
608 | const struct kernel_param *kp, |
609 | const char *name) |
610 | { |
611 | struct module_param_attrs *new; |
612 | struct attribute **attrs; |
613 | int err, num; |
614 | |
615 | /* We don't bother calling this with invisible parameters. */ |
616 | BUG_ON(!kp->perm); |
617 | |
618 | if (!mk->mp) { |
619 | num = 0; |
620 | attrs = NULL; |
621 | } else { |
622 | num = mk->mp->num; |
623 | attrs = mk->mp->grp.attrs; |
624 | } |
625 | |
626 | /* Enlarge. */ |
627 | new = krealloc(mk->mp, |
628 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), |
629 | GFP_KERNEL); |
630 | if (!new) { |
631 | kfree(mk->mp); |
632 | err = -ENOMEM; |
633 | goto fail; |
634 | } |
635 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); |
636 | if (!attrs) { |
637 | err = -ENOMEM; |
638 | goto fail_free_new; |
639 | } |
640 | |
641 | /* Sysfs wants everything zeroed. */ |
642 | memset(new, 0, sizeof(*new)); |
643 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); |
644 | memset(&attrs[num], 0, sizeof(attrs[num])); |
645 | new->grp.name = "parameters"; |
646 | new->grp.attrs = attrs; |
647 | |
648 | /* Tack new one on the end. */ |
649 | sysfs_attr_init(&new->attrs[num].mattr.attr); |
650 | new->attrs[num].param = kp; |
651 | new->attrs[num].mattr.show = param_attr_show; |
652 | new->attrs[num].mattr.store = param_attr_store; |
653 | new->attrs[num].mattr.attr.name = (char *)name; |
654 | new->attrs[num].mattr.attr.mode = kp->perm; |
655 | new->num = num+1; |
656 | |
657 | /* Fix up all the pointers, since krealloc can move us */ |
658 | for (num = 0; num < new->num; num++) |
659 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; |
660 | new->grp.attrs[num] = NULL; |
661 | |
662 | mk->mp = new; |
663 | return 0; |
664 | |
665 | fail_free_new: |
666 | kfree(new); |
667 | fail: |
668 | mk->mp = NULL; |
669 | return err; |
670 | } |
671 | |
672 | #ifdef CONFIG_MODULES |
673 | static void free_module_param_attrs(struct module_kobject *mk) |
674 | { |
675 | kfree(mk->mp->grp.attrs); |
676 | kfree(mk->mp); |
677 | mk->mp = NULL; |
678 | } |
679 | |
680 | /* |
681 | * module_param_sysfs_setup - setup sysfs support for one module |
682 | * @mod: module |
683 | * @kparam: module parameters (array) |
684 | * @num_params: number of module parameters |
685 | * |
686 | * Adds sysfs entries for module parameters under |
687 | * /sys/module/[mod->name]/parameters/ |
688 | */ |
689 | int module_param_sysfs_setup(struct module *mod, |
690 | const struct kernel_param *kparam, |
691 | unsigned int num_params) |
692 | { |
693 | int i, err; |
694 | bool params = false; |
695 | |
696 | for (i = 0; i < num_params; i++) { |
697 | if (kparam[i].perm == 0) |
698 | continue; |
699 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
700 | if (err) |
701 | return err; |
702 | params = true; |
703 | } |
704 | |
705 | if (!params) |
706 | return 0; |
707 | |
708 | /* Create the param group. */ |
709 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
710 | if (err) |
711 | free_module_param_attrs(&mod->mkobj); |
712 | return err; |
713 | } |
714 | |
715 | /* |
716 | * module_param_sysfs_remove - remove sysfs support for one module |
717 | * @mod: module |
718 | * |
719 | * Remove sysfs entries for module parameters and the corresponding |
720 | * kobject. |
721 | */ |
722 | void module_param_sysfs_remove(struct module *mod) |
723 | { |
724 | if (mod->mkobj.mp) { |
725 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
726 | /* We are positive that no one is using any param |
727 | * attrs at this point. Deallocate immediately. */ |
728 | free_module_param_attrs(&mod->mkobj); |
729 | } |
730 | } |
731 | #endif |
732 | |
733 | void destroy_params(const struct kernel_param *params, unsigned num) |
734 | { |
735 | unsigned int i; |
736 | |
737 | for (i = 0; i < num; i++) |
738 | if (params[i].ops->free) |
739 | params[i].ops->free(params[i].arg); |
740 | } |
741 | |
742 | static struct module_kobject * __init locate_module_kobject(const char *name) |
743 | { |
744 | struct module_kobject *mk; |
745 | struct kobject *kobj; |
746 | int err; |
747 | |
748 | kobj = kset_find_obj(module_kset, name); |
749 | if (kobj) { |
750 | mk = to_module_kobject(kobj); |
751 | } else { |
752 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
753 | BUG_ON(!mk); |
754 | |
755 | mk->mod = THIS_MODULE; |
756 | mk->kobj.kset = module_kset; |
757 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
758 | "%s", name); |
759 | #ifdef CONFIG_MODULES |
760 | if (!err) |
761 | err = sysfs_create_file(&mk->kobj, &module_uevent.attr); |
762 | #endif |
763 | if (err) { |
764 | kobject_put(&mk->kobj); |
765 | printk(KERN_ERR |
766 | "Module '%s' failed add to sysfs, error number %d\n", |
767 | name, err); |
768 | printk(KERN_ERR |
769 | "The system will be unstable now.\n"); |
770 | return NULL; |
771 | } |
772 | |
773 | /* So that we hold reference in both cases. */ |
774 | kobject_get(&mk->kobj); |
775 | } |
776 | |
777 | return mk; |
778 | } |
779 | |
780 | static void __init kernel_add_sysfs_param(const char *name, |
781 | struct kernel_param *kparam, |
782 | unsigned int name_skip) |
783 | { |
784 | struct module_kobject *mk; |
785 | int err; |
786 | |
787 | mk = locate_module_kobject(name); |
788 | if (!mk) |
789 | return; |
790 | |
791 | /* We need to remove old parameters before adding more. */ |
792 | if (mk->mp) |
793 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
794 | |
795 | /* These should not fail at boot. */ |
796 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
797 | BUG_ON(err); |
798 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
799 | BUG_ON(err); |
800 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
801 | kobject_put(&mk->kobj); |
802 | } |
803 | |
804 | /* |
805 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules |
806 | * |
807 | * Add module_parameters to sysfs for "modules" built into the kernel. |
808 | * |
809 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
810 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
811 | * extract the "module" name for all built-in kernel_param-eters, |
812 | * and for all who have the same, call kernel_add_sysfs_param. |
813 | */ |
814 | static void __init param_sysfs_builtin(void) |
815 | { |
816 | struct kernel_param *kp; |
817 | unsigned int name_len; |
818 | char modname[MODULE_NAME_LEN]; |
819 | |
820 | for (kp = __start___param; kp < __stop___param; kp++) { |
821 | char *dot; |
822 | |
823 | if (kp->perm == 0) |
824 | continue; |
825 | |
826 | dot = strchr(kp->name, '.'); |
827 | if (!dot) { |
828 | /* This happens for core_param() */ |
829 | strcpy(modname, "kernel"); |
830 | name_len = 0; |
831 | } else { |
832 | name_len = dot - kp->name + 1; |
833 | strlcpy(modname, kp->name, name_len); |
834 | } |
835 | kernel_add_sysfs_param(modname, kp, name_len); |
836 | } |
837 | } |
838 | |
839 | ssize_t __modver_version_show(struct module_attribute *mattr, |
840 | struct module_kobject *mk, char *buf) |
841 | { |
842 | struct module_version_attribute *vattr = |
843 | container_of(mattr, struct module_version_attribute, mattr); |
844 | |
845 | return sprintf(buf, "%s\n", vattr->version); |
846 | } |
847 | |
848 | extern const struct module_version_attribute *__start___modver[]; |
849 | extern const struct module_version_attribute *__stop___modver[]; |
850 | |
851 | static void __init version_sysfs_builtin(void) |
852 | { |
853 | const struct module_version_attribute **p; |
854 | struct module_kobject *mk; |
855 | int err; |
856 | |
857 | for (p = __start___modver; p < __stop___modver; p++) { |
858 | const struct module_version_attribute *vattr = *p; |
859 | |
860 | mk = locate_module_kobject(vattr->module_name); |
861 | if (mk) { |
862 | err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); |
863 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
864 | kobject_put(&mk->kobj); |
865 | } |
866 | } |
867 | } |
868 | |
869 | /* module-related sysfs stuff */ |
870 | |
871 | static ssize_t module_attr_show(struct kobject *kobj, |
872 | struct attribute *attr, |
873 | char *buf) |
874 | { |
875 | struct module_attribute *attribute; |
876 | struct module_kobject *mk; |
877 | int ret; |
878 | |
879 | attribute = to_module_attr(attr); |
880 | mk = to_module_kobject(kobj); |
881 | |
882 | if (!attribute->show) |
883 | return -EIO; |
884 | |
885 | ret = attribute->show(attribute, mk, buf); |
886 | |
887 | return ret; |
888 | } |
889 | |
890 | static ssize_t module_attr_store(struct kobject *kobj, |
891 | struct attribute *attr, |
892 | const char *buf, size_t len) |
893 | { |
894 | struct module_attribute *attribute; |
895 | struct module_kobject *mk; |
896 | int ret; |
897 | |
898 | attribute = to_module_attr(attr); |
899 | mk = to_module_kobject(kobj); |
900 | |
901 | if (!attribute->store) |
902 | return -EIO; |
903 | |
904 | ret = attribute->store(attribute, mk, buf, len); |
905 | |
906 | return ret; |
907 | } |
908 | |
909 | static const struct sysfs_ops module_sysfs_ops = { |
910 | .show = module_attr_show, |
911 | .store = module_attr_store, |
912 | }; |
913 | |
914 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
915 | { |
916 | struct kobj_type *ktype = get_ktype(kobj); |
917 | |
918 | if (ktype == &module_ktype) |
919 | return 1; |
920 | return 0; |
921 | } |
922 | |
923 | static const struct kset_uevent_ops module_uevent_ops = { |
924 | .filter = uevent_filter, |
925 | }; |
926 | |
927 | struct kset *module_kset; |
928 | int module_sysfs_initialized; |
929 | |
930 | struct kobj_type module_ktype = { |
931 | .sysfs_ops = &module_sysfs_ops, |
932 | }; |
933 | |
934 | /* |
935 | * param_sysfs_init - wrapper for built-in params support |
936 | */ |
937 | static int __init param_sysfs_init(void) |
938 | { |
939 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
940 | if (!module_kset) { |
941 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
942 | __FILE__, __LINE__); |
943 | return -ENOMEM; |
944 | } |
945 | module_sysfs_initialized = 1; |
946 | |
947 | version_sysfs_builtin(); |
948 | param_sysfs_builtin(); |
949 | |
950 | return 0; |
951 | } |
952 | subsys_initcall(param_sysfs_init); |
953 | |
954 | #endif /* CONFIG_SYSFS */ |
955 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9