projects/linux·blob v3.4-rc4 · refs

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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. */
28static DEFINE_MUTEX(param_lock);
29
30/* This just allows us to keep track of which parameters are kmalloced. */
31struct kmalloced_param {
32 struct list_head list;
33 char val[];
34};
35static LIST_HEAD(kmalloced_params);
36
37static 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. */
50static 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
63static char dash2underscore(char c)
64{
65 if (c == '-')
66 return '_';
67 return c;
68}
69
70bool 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
81bool parameq(const char *a, const char *b)
82{
83 return parameqn(a, b, strlen(a)+1);
84}
85
86static int parse_one(char *param,
87 char *val,
88 const struct kernel_param *params,
89 unsigned num_params,
90 s16 min_level,
91 s16 max_level,
92 int (*handle_unknown)(char *param, char *val))
93{
94 unsigned int i;
95 int err;
96
97 /* Find parameter */
98 for (i = 0; i < num_params; i++) {
99 if (parameq(param, params[i].name)) {
100 if (params[i].level < min_level
101 || params[i].level > max_level)
102 return 0;
103 /* No one handled NULL, so do it here. */
104 if (!val && params[i].ops->set != param_set_bool
105 && params[i].ops->set != param_set_bint)
106 return -EINVAL;
107 pr_debug("They are equal! Calling %p\n",
108 params[i].ops->set);
109 mutex_lock(&param_lock);
110 err = params[i].ops->set(val, &params[i]);
111 mutex_unlock(&param_lock);
112 return err;
113 }
114 }
115
116 if (handle_unknown) {
117 pr_debug("Unknown argument: calling %p\n", handle_unknown);
118 return handle_unknown(param, val);
119 }
120
121 pr_debug("Unknown argument `%s'\n", param);
122 return -ENOENT;
123}
124
125/* You can use " around spaces, but can't escape ". */
126/* Hyphens and underscores equivalent in parameter names. */
127static char *next_arg(char *args, char **param, char **val)
128{
129 unsigned int i, equals = 0;
130 int in_quote = 0, quoted = 0;
131 char *next;
132
133 if (*args == '"') {
134 args++;
135 in_quote = 1;
136 quoted = 1;
137 }
138
139 for (i = 0; args[i]; i++) {
140 if (isspace(args[i]) && !in_quote)
141 break;
142 if (equals == 0) {
143 if (args[i] == '=')
144 equals = i;
145 }
146 if (args[i] == '"')
147 in_quote = !in_quote;
148 }
149
150 *param = args;
151 if (!equals)
152 *val = NULL;
153 else {
154 args[equals] = '\0';
155 *val = args + equals + 1;
156
157 /* Don't include quotes in value. */
158 if (**val == '"') {
159 (*val)++;
160 if (args[i-1] == '"')
161 args[i-1] = '\0';
162 }
163 if (quoted && args[i-1] == '"')
164 args[i-1] = '\0';
165 }
166
167 if (args[i]) {
168 args[i] = '\0';
169 next = args + i + 1;
170 } else
171 next = args + i;
172
173 /* Chew up trailing spaces. */
174 return skip_spaces(next);
175}
176
177/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
178int parse_args(const char *name,
179 char *args,
180 const struct kernel_param *params,
181 unsigned num,
182 s16 min_level,
183 s16 max_level,
184 int (*unknown)(char *param, char *val))
185{
186 char *param, *val;
187
188 pr_debug("Parsing ARGS: %s\n", args);
189
190 /* Chew leading spaces */
191 args = skip_spaces(args);
192
193 while (*args) {
194 int ret;
195 int irq_was_disabled;
196
197 args = next_arg(args, &param, &val);
198 irq_was_disabled = irqs_disabled();
199 ret = parse_one(param, val, params, num,
200 min_level, max_level, unknown);
201 if (irq_was_disabled && !irqs_disabled()) {
202 printk(KERN_WARNING "parse_args(): option '%s' enabled "
203 "irq's!\n", param);
204 }
205 switch (ret) {
206 case -ENOENT:
207 printk(KERN_ERR "%s: Unknown parameter `%s'\n",
208 name, param);
209 return ret;
210 case -ENOSPC:
211 printk(KERN_ERR
212 "%s: `%s' too large for parameter `%s'\n",
213 name, val ?: "", param);
214 return ret;
215 case 0:
216 break;
217 default:
218 printk(KERN_ERR
219 "%s: `%s' invalid for parameter `%s'\n",
220 name, 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
255STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
256STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
257STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
258STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
259STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
260STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
261STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
262
263int param_set_charp(const char *val, const struct kernel_param *kp)
264{
265 if (strlen(val) > 1024) {
266 printk(KERN_ERR "%s: string parameter too long\n",
267 kp->name);
268 return -ENOSPC;
269 }
270
271 maybe_kfree_parameter(*(char **)kp->arg);
272
273 /* This is a hack. We can't kmalloc in early boot, and we
274 * don't need to; this mangled commandline is preserved. */
275 if (slab_is_available()) {
276 *(char **)kp->arg = kmalloc_parameter(strlen(val)+1);
277 if (!*(char **)kp->arg)
278 return -ENOMEM;
279 strcpy(*(char **)kp->arg, val);
280 } else
281 *(const char **)kp->arg = val;
282
283 return 0;
284}
285EXPORT_SYMBOL(param_set_charp);
286
287int param_get_charp(char *buffer, const struct kernel_param *kp)
288{
289 return sprintf(buffer, "%s", *((char **)kp->arg));
290}
291EXPORT_SYMBOL(param_get_charp);
292
293static void param_free_charp(void *arg)
294{
295 maybe_kfree_parameter(*((char **)arg));
296}
297
298struct kernel_param_ops param_ops_charp = {
299 .set = param_set_charp,
300 .get = param_get_charp,
301 .free = param_free_charp,
302};
303EXPORT_SYMBOL(param_ops_charp);
304
305/* Actually could be a bool or an int, for historical reasons. */
306int param_set_bool(const char *val, const struct kernel_param *kp)
307{
308 /* No equals means "set"... */
309 if (!val) val = "1";
310
311 /* One of =[yYnN01] */
312 return strtobool(val, kp->arg);
313}
314EXPORT_SYMBOL(param_set_bool);
315
316int param_get_bool(char *buffer, const struct kernel_param *kp)
317{
318 /* Y and N chosen as being relatively non-coder friendly */
319 return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N');
320}
321EXPORT_SYMBOL(param_get_bool);
322
323struct kernel_param_ops param_ops_bool = {
324 .set = param_set_bool,
325 .get = param_get_bool,
326};
327EXPORT_SYMBOL(param_ops_bool);
328
329/* This one must be bool. */
330int param_set_invbool(const char *val, const struct kernel_param *kp)
331{
332 int ret;
333 bool boolval;
334 struct kernel_param dummy;
335
336 dummy.arg = &boolval;
337 ret = param_set_bool(val, &dummy);
338 if (ret == 0)
339 *(bool *)kp->arg = !boolval;
340 return ret;
341}
342EXPORT_SYMBOL(param_set_invbool);
343
344int param_get_invbool(char *buffer, const struct kernel_param *kp)
345{
346 return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
347}
348EXPORT_SYMBOL(param_get_invbool);
349
350struct kernel_param_ops param_ops_invbool = {
351 .set = param_set_invbool,
352 .get = param_get_invbool,
353};
354EXPORT_SYMBOL(param_ops_invbool);
355
356int param_set_bint(const char *val, const struct kernel_param *kp)
357{
358 struct kernel_param boolkp;
359 bool v;
360 int ret;
361
362 /* Match bool exactly, by re-using it. */
363 boolkp = *kp;
364 boolkp.arg = &v;
365
366 ret = param_set_bool(val, &boolkp);
367 if (ret == 0)
368 *(int *)kp->arg = v;
369 return ret;
370}
371EXPORT_SYMBOL(param_set_bint);
372
373struct kernel_param_ops param_ops_bint = {
374 .set = param_set_bint,
375 .get = param_get_int,
376};
377EXPORT_SYMBOL(param_ops_bint);
378
379/* We break the rule and mangle the string. */
380static int param_array(const char *name,
381 const char *val,
382 unsigned int min, unsigned int max,
383 void *elem, int elemsize,
384 int (*set)(const char *, const struct kernel_param *kp),
385 s16 level,
386 unsigned int *num)
387{
388 int ret;
389 struct kernel_param kp;
390 char save;
391
392 /* Get the name right for errors. */
393 kp.name = name;
394 kp.arg = elem;
395 kp.level = level;
396
397 *num = 0;
398 /* We expect a comma-separated list of values. */
399 do {
400 int len;
401
402 if (*num == max) {
403 printk(KERN_ERR "%s: can only take %i arguments\n",
404 name, max);
405 return -EINVAL;
406 }
407 len = strcspn(val, ",");
408
409 /* nul-terminate and parse */
410 save = val[len];
411 ((char *)val)[len] = '\0';
412 BUG_ON(!mutex_is_locked(&param_lock));
413 ret = set(val, &kp);
414
415 if (ret != 0)
416 return ret;
417 kp.arg += elemsize;
418 val += len+1;
419 (*num)++;
420 } while (save == ',');
421
422 if (*num < min) {
423 printk(KERN_ERR "%s: needs at least %i arguments\n",
424 name, min);
425 return -EINVAL;
426 }
427 return 0;
428}
429
430static int param_array_set(const char *val, const struct kernel_param *kp)
431{
432 const struct kparam_array *arr = kp->arr;
433 unsigned int temp_num;
434
435 return param_array(kp->name, val, 1, arr->max, arr->elem,
436 arr->elemsize, arr->ops->set, kp->level,
437 arr->num ?: &temp_num);
438}
439
440static int param_array_get(char *buffer, const struct kernel_param *kp)
441{
442 int i, off, ret;
443 const struct kparam_array *arr = kp->arr;
444 struct kernel_param p;
445
446 p = *kp;
447 for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
448 if (i)
449 buffer[off++] = ',';
450 p.arg = arr->elem + arr->elemsize * i;
451 BUG_ON(!mutex_is_locked(&param_lock));
452 ret = arr->ops->get(buffer + off, &p);
453 if (ret < 0)
454 return ret;
455 off += ret;
456 }
457 buffer[off] = '\0';
458 return off;
459}
460
461static void param_array_free(void *arg)
462{
463 unsigned int i;
464 const struct kparam_array *arr = arg;
465
466 if (arr->ops->free)
467 for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
468 arr->ops->free(arr->elem + arr->elemsize * i);
469}
470
471struct kernel_param_ops param_array_ops = {
472 .set = param_array_set,
473 .get = param_array_get,
474 .free = param_array_free,
475};
476EXPORT_SYMBOL(param_array_ops);
477
478int param_set_copystring(const char *val, const struct kernel_param *kp)
479{
480 const struct kparam_string *kps = kp->str;
481
482 if (strlen(val)+1 > kps->maxlen) {
483 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
484 kp->name, kps->maxlen-1);
485 return -ENOSPC;
486 }
487 strcpy(kps->string, val);
488 return 0;
489}
490EXPORT_SYMBOL(param_set_copystring);
491
492int param_get_string(char *buffer, const struct kernel_param *kp)
493{
494 const struct kparam_string *kps = kp->str;
495 return strlcpy(buffer, kps->string, kps->maxlen);
496}
497EXPORT_SYMBOL(param_get_string);
498
499struct kernel_param_ops param_ops_string = {
500 .set = param_set_copystring,
501 .get = param_get_string,
502};
503EXPORT_SYMBOL(param_ops_string);
504
505/* sysfs output in /sys/modules/XYZ/parameters/ */
506#define to_module_attr(n) container_of(n, struct module_attribute, attr)
507#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
508
509extern struct kernel_param __start___param[], __stop___param[];
510
511struct param_attribute
512{
513 struct module_attribute mattr;
514 const struct kernel_param *param;
515};
516
517struct module_param_attrs
518{
519 unsigned int num;
520 struct attribute_group grp;
521 struct param_attribute attrs[0];
522};
523
524#ifdef CONFIG_SYSFS
525#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
526
527static ssize_t param_attr_show(struct module_attribute *mattr,
528 struct module_kobject *mk, char *buf)
529{
530 int count;
531 struct param_attribute *attribute = to_param_attr(mattr);
532
533 if (!attribute->param->ops->get)
534 return -EPERM;
535
536 mutex_lock(&param_lock);
537 count = attribute->param->ops->get(buf, attribute->param);
538 mutex_unlock(&param_lock);
539 if (count > 0) {
540 strcat(buf, "\n");
541 ++count;
542 }
543 return count;
544}
545
546/* sysfs always hands a nul-terminated string in buf. We rely on that. */
547static ssize_t param_attr_store(struct module_attribute *mattr,
548 struct module_kobject *km,
549 const char *buf, size_t len)
550{
551 int err;
552 struct param_attribute *attribute = to_param_attr(mattr);
553
554 if (!attribute->param->ops->set)
555 return -EPERM;
556
557 mutex_lock(&param_lock);
558 err = attribute->param->ops->set(buf, attribute->param);
559 mutex_unlock(&param_lock);
560 if (!err)
561 return len;
562 return err;
563}
564#endif
565
566#ifdef CONFIG_MODULES
567#define __modinit
568#else
569#define __modinit __init
570#endif
571
572#ifdef CONFIG_SYSFS
573void __kernel_param_lock(void)
574{
575 mutex_lock(&param_lock);
576}
577EXPORT_SYMBOL(__kernel_param_lock);
578
579void __kernel_param_unlock(void)
580{
581 mutex_unlock(&param_lock);
582}
583EXPORT_SYMBOL(__kernel_param_unlock);
584
585/*
586 * add_sysfs_param - add a parameter to sysfs
587 * @mk: struct module_kobject
588 * @kparam: the actual parameter definition to add to sysfs
589 * @name: name of parameter
590 *
591 * Create a kobject if for a (per-module) parameter if mp NULL, and
592 * create file in sysfs. Returns an error on out of memory. Always cleans up
593 * if there's an error.
594 */
595static __modinit int add_sysfs_param(struct module_kobject *mk,
596 const struct kernel_param *kp,
597 const char *name)
598{
599 struct module_param_attrs *new;
600 struct attribute **attrs;
601 int err, num;
602
603 /* We don't bother calling this with invisible parameters. */
604 BUG_ON(!kp->perm);
605
606 if (!mk->mp) {
607 num = 0;
608 attrs = NULL;
609 } else {
610 num = mk->mp->num;
611 attrs = mk->mp->grp.attrs;
612 }
613
614 /* Enlarge. */
615 new = krealloc(mk->mp,
616 sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
617 GFP_KERNEL);
618 if (!new) {
619 kfree(mk->mp);
620 err = -ENOMEM;
621 goto fail;
622 }
623 attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
624 if (!attrs) {
625 err = -ENOMEM;
626 goto fail_free_new;
627 }
628
629 /* Sysfs wants everything zeroed. */
630 memset(new, 0, sizeof(*new));
631 memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
632 memset(&attrs[num], 0, sizeof(attrs[num]));
633 new->grp.name = "parameters";
634 new->grp.attrs = attrs;
635
636 /* Tack new one on the end. */
637 sysfs_attr_init(&new->attrs[num].mattr.attr);
638 new->attrs[num].param = kp;
639 new->attrs[num].mattr.show = param_attr_show;
640 new->attrs[num].mattr.store = param_attr_store;
641 new->attrs[num].mattr.attr.name = (char *)name;
642 new->attrs[num].mattr.attr.mode = kp->perm;
643 new->num = num+1;
644
645 /* Fix up all the pointers, since krealloc can move us */
646 for (num = 0; num < new->num; num++)
647 new->grp.attrs[num] = &new->attrs[num].mattr.attr;
648 new->grp.attrs[num] = NULL;
649
650 mk->mp = new;
651 return 0;
652
653fail_free_new:
654 kfree(new);
655fail:
656 mk->mp = NULL;
657 return err;
658}
659
660#ifdef CONFIG_MODULES
661static void free_module_param_attrs(struct module_kobject *mk)
662{
663 kfree(mk->mp->grp.attrs);
664 kfree(mk->mp);
665 mk->mp = NULL;
666}
667
668/*
669 * module_param_sysfs_setup - setup sysfs support for one module
670 * @mod: module
671 * @kparam: module parameters (array)
672 * @num_params: number of module parameters
673 *
674 * Adds sysfs entries for module parameters under
675 * /sys/module/[mod->name]/parameters/
676 */
677int module_param_sysfs_setup(struct module *mod,
678 const struct kernel_param *kparam,
679 unsigned int num_params)
680{
681 int i, err;
682 bool params = false;
683
684 for (i = 0; i < num_params; i++) {
685 if (kparam[i].perm == 0)
686 continue;
687 err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
688 if (err)
689 return err;
690 params = true;
691 }
692
693 if (!params)
694 return 0;
695
696 /* Create the param group. */
697 err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
698 if (err)
699 free_module_param_attrs(&mod->mkobj);
700 return err;
701}
702
703/*
704 * module_param_sysfs_remove - remove sysfs support for one module
705 * @mod: module
706 *
707 * Remove sysfs entries for module parameters and the corresponding
708 * kobject.
709 */
710void module_param_sysfs_remove(struct module *mod)
711{
712 if (mod->mkobj.mp) {
713 sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
714 /* We are positive that no one is using any param
715 * attrs at this point. Deallocate immediately. */
716 free_module_param_attrs(&mod->mkobj);
717 }
718}
719#endif
720
721void destroy_params(const struct kernel_param *params, unsigned num)
722{
723 unsigned int i;
724
725 for (i = 0; i < num; i++)
726 if (params[i].ops->free)
727 params[i].ops->free(params[i].arg);
728}
729
730static struct module_kobject * __init locate_module_kobject(const char *name)
731{
732 struct module_kobject *mk;
733 struct kobject *kobj;
734 int err;
735
736 kobj = kset_find_obj(module_kset, name);
737 if (kobj) {
738 mk = to_module_kobject(kobj);
739 } else {
740 mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
741 BUG_ON(!mk);
742
743 mk->mod = THIS_MODULE;
744 mk->kobj.kset = module_kset;
745 err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
746 "%s", name);
747#ifdef CONFIG_MODULES
748 if (!err)
749 err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
750#endif
751 if (err) {
752 kobject_put(&mk->kobj);
753 printk(KERN_ERR
754 "Module '%s' failed add to sysfs, error number %d\n",
755 name, err);
756 printk(KERN_ERR
757 "The system will be unstable now.\n");
758 return NULL;
759 }
760
761 /* So that we hold reference in both cases. */
762 kobject_get(&mk->kobj);
763 }
764
765 return mk;
766}
767
768static void __init kernel_add_sysfs_param(const char *name,
769 struct kernel_param *kparam,
770 unsigned int name_skip)
771{
772 struct module_kobject *mk;
773 int err;
774
775 mk = locate_module_kobject(name);
776 if (!mk)
777 return;
778
779 /* We need to remove old parameters before adding more. */
780 if (mk->mp)
781 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
782
783 /* These should not fail at boot. */
784 err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
785 BUG_ON(err);
786 err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
787 BUG_ON(err);
788 kobject_uevent(&mk->kobj, KOBJ_ADD);
789 kobject_put(&mk->kobj);
790}
791
792/*
793 * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
794 *
795 * Add module_parameters to sysfs for "modules" built into the kernel.
796 *
797 * The "module" name (KBUILD_MODNAME) is stored before a dot, the
798 * "parameter" name is stored behind a dot in kernel_param->name. So,
799 * extract the "module" name for all built-in kernel_param-eters,
800 * and for all who have the same, call kernel_add_sysfs_param.
801 */
802static void __init param_sysfs_builtin(void)
803{
804 struct kernel_param *kp;
805 unsigned int name_len;
806 char modname[MODULE_NAME_LEN];
807
808 for (kp = __start___param; kp < __stop___param; kp++) {
809 char *dot;
810
811 if (kp->perm == 0)
812 continue;
813
814 dot = strchr(kp->name, '.');
815 if (!dot) {
816 /* This happens for core_param() */
817 strcpy(modname, "kernel");
818 name_len = 0;
819 } else {
820 name_len = dot - kp->name + 1;
821 strlcpy(modname, kp->name, name_len);
822 }
823 kernel_add_sysfs_param(modname, kp, name_len);
824 }
825}
826
827ssize_t __modver_version_show(struct module_attribute *mattr,
828 struct module_kobject *mk, char *buf)
829{
830 struct module_version_attribute *vattr =
831 container_of(mattr, struct module_version_attribute, mattr);
832
833 return sprintf(buf, "%s\n", vattr->version);
834}
835
836extern const struct module_version_attribute *__start___modver[];
837extern const struct module_version_attribute *__stop___modver[];
838
839static void __init version_sysfs_builtin(void)
840{
841 const struct module_version_attribute **p;
842 struct module_kobject *mk;
843 int err;
844
845 for (p = __start___modver; p < __stop___modver; p++) {
846 const struct module_version_attribute *vattr = *p;
847
848 mk = locate_module_kobject(vattr->module_name);
849 if (mk) {
850 err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
851 kobject_uevent(&mk->kobj, KOBJ_ADD);
852 kobject_put(&mk->kobj);
853 }
854 }
855}
856
857/* module-related sysfs stuff */
858
859static ssize_t module_attr_show(struct kobject *kobj,
860 struct attribute *attr,
861 char *buf)
862{
863 struct module_attribute *attribute;
864 struct module_kobject *mk;
865 int ret;
866
867 attribute = to_module_attr(attr);
868 mk = to_module_kobject(kobj);
869
870 if (!attribute->show)
871 return -EIO;
872
873 ret = attribute->show(attribute, mk, buf);
874
875 return ret;
876}
877
878static ssize_t module_attr_store(struct kobject *kobj,
879 struct attribute *attr,
880 const char *buf, size_t len)
881{
882 struct module_attribute *attribute;
883 struct module_kobject *mk;
884 int ret;
885
886 attribute = to_module_attr(attr);
887 mk = to_module_kobject(kobj);
888
889 if (!attribute->store)
890 return -EIO;
891
892 ret = attribute->store(attribute, mk, buf, len);
893
894 return ret;
895}
896
897static const struct sysfs_ops module_sysfs_ops = {
898 .show = module_attr_show,
899 .store = module_attr_store,
900};
901
902static int uevent_filter(struct kset *kset, struct kobject *kobj)
903{
904 struct kobj_type *ktype = get_ktype(kobj);
905
906 if (ktype == &module_ktype)
907 return 1;
908 return 0;
909}
910
911static const struct kset_uevent_ops module_uevent_ops = {
912 .filter = uevent_filter,
913};
914
915struct kset *module_kset;
916int module_sysfs_initialized;
917
918struct kobj_type module_ktype = {
919 .sysfs_ops = &module_sysfs_ops,
920};
921
922/*
923 * param_sysfs_init - wrapper for built-in params support
924 */
925static int __init param_sysfs_init(void)
926{
927 module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
928 if (!module_kset) {
929 printk(KERN_WARNING "%s (%d): error creating kset\n",
930 __FILE__, __LINE__);
931 return -ENOMEM;
932 }
933 module_sysfs_initialized = 1;
934
935 version_sysfs_builtin();
936 param_sysfs_builtin();
937
938 return 0;
939}
940subsys_initcall(param_sysfs_init);
941
942#endif /* CONFIG_SYSFS */