projects/linux·blob v3.10-rc7 · 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 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(&param_lock);
112 err = params[i].ops->set(val, &params[i]);
113 mutex_unlock(&param_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. */
129static 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". */
180int 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, &param, &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
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 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}
284EXPORT_SYMBOL(param_set_charp);
285
286int param_get_charp(char *buffer, const struct kernel_param *kp)
287{
288 return sprintf(buffer, "%s", *((char **)kp->arg));
289}
290EXPORT_SYMBOL(param_get_charp);
291
292static void param_free_charp(void *arg)
293{
294 maybe_kfree_parameter(*((char **)arg));
295}
296
297struct kernel_param_ops param_ops_charp = {
298 .set = param_set_charp,
299 .get = param_get_charp,
300 .free = param_free_charp,
301};
302EXPORT_SYMBOL(param_ops_charp);
303
304/* Actually could be a bool or an int, for historical reasons. */
305int 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}
313EXPORT_SYMBOL(param_set_bool);
314
315int 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}
320EXPORT_SYMBOL(param_get_bool);
321
322struct kernel_param_ops param_ops_bool = {
323 .set = param_set_bool,
324 .get = param_get_bool,
325};
326EXPORT_SYMBOL(param_ops_bool);
327
328/* This one must be bool. */
329int 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}
341EXPORT_SYMBOL(param_set_invbool);
342
343int param_get_invbool(char *buffer, const struct kernel_param *kp)
344{
345 return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
346}
347EXPORT_SYMBOL(param_get_invbool);
348
349struct kernel_param_ops param_ops_invbool = {
350 .set = param_set_invbool,
351 .get = param_get_invbool,
352};
353EXPORT_SYMBOL(param_ops_invbool);
354
355int 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}
370EXPORT_SYMBOL(param_set_bint);
371
372struct kernel_param_ops param_ops_bint = {
373 .set = param_set_bint,
374 .get = param_get_int,
375};
376EXPORT_SYMBOL(param_ops_bint);
377
378/* We break the rule and mangle the string. */
379static 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(&param_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
427static 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
437static 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(&param_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
458static 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
468struct kernel_param_ops param_array_ops = {
469 .set = param_array_set,
470 .get = param_array_get,
471 .free = param_array_free,
472};
473EXPORT_SYMBOL(param_array_ops);
474
475int 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}
487EXPORT_SYMBOL(param_set_copystring);
488
489int 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}
494EXPORT_SYMBOL(param_get_string);
495
496struct kernel_param_ops param_ops_string = {
497 .set = param_set_copystring,
498 .get = param_get_string,
499};
500EXPORT_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
506extern struct kernel_param __start___param[], __stop___param[];
507
508struct param_attribute
509{
510 struct module_attribute mattr;
511 const struct kernel_param *param;
512};
513
514struct 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
524static 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(&param_lock);
534 count = attribute->param->ops->get(buf, attribute->param);
535 mutex_unlock(&param_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. */
544static 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(&param_lock);
555 err = attribute->param->ops->set(buf, attribute->param);
556 mutex_unlock(&param_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
570void __kernel_param_lock(void)
571{
572 mutex_lock(&param_lock);
573}
574EXPORT_SYMBOL(__kernel_param_lock);
575
576void __kernel_param_unlock(void)
577{
578 mutex_unlock(&param_lock);
579}
580EXPORT_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 */
592static __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(attrs);
617 err = -ENOMEM;
618 goto fail;
619 }
620 /* Despite looking like the typical realloc() bug, this is safe.
621 * We *want* the old 'attrs' to be freed either way, and we'll store
622 * the new one in the success case. */
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 pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n",
754 name, err);
755 return NULL;
756 }
757
758 /* So that we hold reference in both cases. */
759 kobject_get(&mk->kobj);
760 }
761
762 return mk;
763}
764
765static void __init kernel_add_sysfs_param(const char *name,
766 struct kernel_param *kparam,
767 unsigned int name_skip)
768{
769 struct module_kobject *mk;
770 int err;
771
772 mk = locate_module_kobject(name);
773 if (!mk)
774 return;
775
776 /* We need to remove old parameters before adding more. */
777 if (mk->mp)
778 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
779
780 /* These should not fail at boot. */
781 err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
782 BUG_ON(err);
783 err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
784 BUG_ON(err);
785 kobject_uevent(&mk->kobj, KOBJ_ADD);
786 kobject_put(&mk->kobj);
787}
788
789/*
790 * param_sysfs_builtin - add contents in /sys/parameters for built-in modules
791 *
792 * Add module_parameters to sysfs for "modules" built into the kernel.
793 *
794 * The "module" name (KBUILD_MODNAME) is stored before a dot, the
795 * "parameter" name is stored behind a dot in kernel_param->name. So,
796 * extract the "module" name for all built-in kernel_param-eters,
797 * and for all who have the same, call kernel_add_sysfs_param.
798 */
799static void __init param_sysfs_builtin(void)
800{
801 struct kernel_param *kp;
802 unsigned int name_len;
803 char modname[MODULE_NAME_LEN];
804
805 for (kp = __start___param; kp < __stop___param; kp++) {
806 char *dot;
807
808 if (kp->perm == 0)
809 continue;
810
811 dot = strchr(kp->name, '.');
812 if (!dot) {
813 /* This happens for core_param() */
814 strcpy(modname, "kernel");
815 name_len = 0;
816 } else {
817 name_len = dot - kp->name + 1;
818 strlcpy(modname, kp->name, name_len);
819 }
820 kernel_add_sysfs_param(modname, kp, name_len);
821 }
822}
823
824ssize_t __modver_version_show(struct module_attribute *mattr,
825 struct module_kobject *mk, char *buf)
826{
827 struct module_version_attribute *vattr =
828 container_of(mattr, struct module_version_attribute, mattr);
829
830 return sprintf(buf, "%s\n", vattr->version);
831}
832
833extern const struct module_version_attribute *__start___modver[];
834extern const struct module_version_attribute *__stop___modver[];
835
836static void __init version_sysfs_builtin(void)
837{
838 const struct module_version_attribute **p;
839 struct module_kobject *mk;
840 int err;
841
842 for (p = __start___modver; p < __stop___modver; p++) {
843 const struct module_version_attribute *vattr = *p;
844
845 mk = locate_module_kobject(vattr->module_name);
846 if (mk) {
847 err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
848 kobject_uevent(&mk->kobj, KOBJ_ADD);
849 kobject_put(&mk->kobj);
850 }
851 }
852}
853
854/* module-related sysfs stuff */
855
856static ssize_t module_attr_show(struct kobject *kobj,
857 struct attribute *attr,
858 char *buf)
859{
860 struct module_attribute *attribute;
861 struct module_kobject *mk;
862 int ret;
863
864 attribute = to_module_attr(attr);
865 mk = to_module_kobject(kobj);
866
867 if (!attribute->show)
868 return -EIO;
869
870 ret = attribute->show(attribute, mk, buf);
871
872 return ret;
873}
874
875static ssize_t module_attr_store(struct kobject *kobj,
876 struct attribute *attr,
877 const char *buf, size_t len)
878{
879 struct module_attribute *attribute;
880 struct module_kobject *mk;
881 int ret;
882
883 attribute = to_module_attr(attr);
884 mk = to_module_kobject(kobj);
885
886 if (!attribute->store)
887 return -EIO;
888
889 ret = attribute->store(attribute, mk, buf, len);
890
891 return ret;
892}
893
894static const struct sysfs_ops module_sysfs_ops = {
895 .show = module_attr_show,
896 .store = module_attr_store,
897};
898
899static int uevent_filter(struct kset *kset, struct kobject *kobj)
900{
901 struct kobj_type *ktype = get_ktype(kobj);
902
903 if (ktype == &module_ktype)
904 return 1;
905 return 0;
906}
907
908static const struct kset_uevent_ops module_uevent_ops = {
909 .filter = uevent_filter,
910};
911
912struct kset *module_kset;
913int module_sysfs_initialized;
914
915struct kobj_type module_ktype = {
916 .sysfs_ops = &module_sysfs_ops,
917};
918
919/*
920 * param_sysfs_init - wrapper for built-in params support
921 */
922static int __init param_sysfs_init(void)
923{
924 module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
925 if (!module_kset) {
926 printk(KERN_WARNING "%s (%d): error creating kset\n",
927 __FILE__, __LINE__);
928 return -ENOMEM;
929 }
930 module_sysfs_initialized = 1;
931
932 version_sysfs_builtin();
933 param_sysfs_builtin();
934
935 return 0;
936}
937subsys_initcall(param_sysfs_init);
938
939#endif /* CONFIG_SYSFS */