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