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