blob: ad8d04563c3a02bf3fa81fe6ff29b0317c972c3c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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*/
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#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>
Tim Schmielau4e57b682005-10-30 15:03:48 -080024#include <linux/slab.h>
Peter Oberparleiter26d052b2009-07-06 17:11:22 +020025#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Rusty Russell907b29e2010-08-11 23:04:19 -060027/* Protects all parameters, and incidentally kmalloced_param list. */
28static DEFINE_MUTEX(param_lock);
29
Rusty Russella1054322010-08-11 23:04:18 -060030/* This just allows us to keep track of which parameters are kmalloced. */
31struct kmalloced_param {
32 struct list_head list;
33 char val[];
34};
Rusty Russella1054322010-08-11 23:04:18 -060035static 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
Rusty Russella1054322010-08-11 23:04:18 -060045 list_add(&p->list, &kmalloced_params);
Rusty Russella1054322010-08-11 23:04:18 -060046 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
Rusty Russella1054322010-08-11 23:04:18 -060054 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 }
Rusty Russella1054322010-08-11 23:04:18 -060061}
62
Michal Schmidtb1e4d202011-10-10 00:03:37 +020063static char dash2underscore(char c)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 if (c == '-')
66 return '_';
67 return c;
68}
69
Michal Schmidtb1e4d202011-10-10 00:03:37 +020070bool parameqn(const char *a, const char *b, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Michal Schmidtb1e4d202011-10-10 00:03:37 +020072 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
86static int parse_one(char *param,
87 char *val,
Jim Cromie9fb48c72012-04-27 14:30:34 -060088 const char *doing,
Rusty Russell914dcaa2010-08-11 23:04:18 -060089 const struct kernel_param *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 unsigned num_params,
Pawel Moll026cee02012-03-26 12:50:51 +103091 s16 min_level,
92 s16 max_level,
Jim Cromie9fb48c72012-04-27 14:30:34 -060093 int (*handle_unknown)(char *param, char *val,
94 const char *doing))
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
96 unsigned int i;
Rusty Russell907b29e2010-08-11 23:04:19 -060097 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 /* Find parameter */
100 for (i = 0; i < num_params; i++) {
101 if (parameq(param, params[i].name)) {
Pawel Moll026cee02012-03-26 12:50:51 +1030102 if (params[i].level < min_level
103 || params[i].level > max_level)
104 return 0;
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300105 /* No one handled NULL, so do it here. */
Steven Rostedtab013c52013-08-20 15:33:19 +0930106 if (!val &&
Jani Nikula6a4c2642014-08-27 06:21:23 +0930107 !(params[i].ops->flags & KERNEL_PARAM_OPS_FL_NOARG))
Rusty Russell2e9fb992010-08-11 23:04:10 -0600108 return -EINVAL;
Jim Cromie9fb48c72012-04-27 14:30:34 -0600109 pr_debug("handling %s with %p\n", param,
110 params[i].ops->set);
Rusty Russell907b29e2010-08-11 23:04:19 -0600111 mutex_lock(&param_lock);
112 err = params[i].ops->set(val, &params[i]);
113 mutex_unlock(&param_lock);
114 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
116 }
117
118 if (handle_unknown) {
Jim Cromie9fb48c72012-04-27 14:30:34 -0600119 pr_debug("doing %s: %s='%s'\n", doing, param, val);
120 return handle_unknown(param, val, doing);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122
Jim Cromie9fb48c72012-04-27 14:30:34 -0600123 pr_debug("Unknown argument '%s'\n", param);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (*args == '"') {
136 args++;
137 in_quote = 1;
138 quoted = 1;
139 }
140
141 for (i = 0; args[i]; i++) {
Peter Oberparleiter26d052b2009-07-06 17:11:22 +0200142 if (isspace(args[i]) && !in_quote)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 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;
Rusty Russellf36462f2005-09-27 21:45:34 -0700174
175 /* Chew up trailing spaces. */
André Goddard Rosae7d28602009-12-14 18:01:06 -0800176 return skip_spaces(next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
179/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
Rusty Russell51e158c2014-04-28 11:34:33 +0930180char *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))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
188 char *param, *val;
189
Rusty Russellf36462f2005-09-27 21:45:34 -0700190 /* Chew leading spaces */
André Goddard Rosae7d28602009-12-14 18:01:06 -0800191 args = skip_spaces(args);
Rusty Russellf36462f2005-09-27 21:45:34 -0700192
Jim Cromie1ef9eaf2012-05-03 11:57:37 -0600193 if (*args)
Jim Cromie9fb48c72012-04-27 14:30:34 -0600194 pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args);
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 while (*args) {
197 int ret;
Ard van Breemena416aba2007-01-05 16:36:20 -0800198 int irq_was_disabled;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 args = next_arg(args, &param, &val);
Rusty Russell51e158c2014-04-28 11:34:33 +0930201 /* Stop at -- */
202 if (!val && strcmp(param, "--") == 0)
203 return args;
Ard van Breemena416aba2007-01-05 16:36:20 -0800204 irq_was_disabled = irqs_disabled();
Jim Cromie9fb48c72012-04-27 14:30:34 -0600205 ret = parse_one(param, val, doing, params, num,
Pawel Moll026cee02012-03-26 12:50:51 +1030206 min_level, max_level, unknown);
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600207 if (irq_was_disabled && !irqs_disabled())
208 pr_warn("%s: option '%s' enabled irq's!\n",
209 doing, param);
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 switch (ret) {
212 case -ENOENT:
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600213 pr_err("%s: Unknown parameter `%s'\n", doing, param);
Rusty Russell51e158c2014-04-28 11:34:33 +0930214 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 case -ENOSPC:
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600216 pr_err("%s: `%s' too large for parameter `%s'\n",
Jim Cromie9fb48c72012-04-27 14:30:34 -0600217 doing, val ?: "", param);
Rusty Russell51e158c2014-04-28 11:34:33 +0930218 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 case 0:
220 break;
221 default:
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600222 pr_err("%s: `%s' invalid for parameter `%s'\n",
Jim Cromie9fb48c72012-04-27 14:30:34 -0600223 doing, val ?: "", param);
Rusty Russell51e158c2014-04-28 11:34:33 +0930224 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226 }
227
228 /* All parsed OK. */
Rusty Russell51e158c2014-04-28 11:34:33 +0930229 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/* Lazy bastard, eh? */
Felipe Contreras88a88b322013-12-04 14:09:38 +1030233#define STANDARD_PARAM_DEF(name, type, format, strtolfn) \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600234 int param_set_##name(const char *val, const struct kernel_param *kp) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 { \
Jani Nikula91f9d332014-08-27 06:22:23 +0930236 param_check_unsafe(kp); \
Felipe Contreras88a88b322013-12-04 14:09:38 +1030237 return strtolfn(val, 0, (type *)kp->arg); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 } \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600239 int param_get_##name(char *buffer, const struct kernel_param *kp) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 { \
Chen Gangf4940ab2013-08-20 15:35:04 +0930241 return scnprintf(buffer, PAGE_SIZE, format, \
242 *((type *)kp->arg)); \
Rusty Russella14fe242010-08-11 23:04:11 -0600243 } \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600244 struct kernel_param_ops param_ops_##name = { \
245 .set = param_set_##name, \
246 .get = param_get_##name, \
247 }; \
Rusty Russella14fe242010-08-11 23:04:11 -0600248 EXPORT_SYMBOL(param_set_##name); \
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600249 EXPORT_SYMBOL(param_get_##name); \
250 EXPORT_SYMBOL(param_ops_##name)
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Felipe Contreras88a88b322013-12-04 14:09:38 +1030253STANDARD_PARAM_DEF(byte, unsigned char, "%hhu", kstrtou8);
254STANDARD_PARAM_DEF(short, short, "%hi", kstrtos16);
255STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", kstrtou16);
256STANDARD_PARAM_DEF(int, int, "%i", kstrtoint);
257STANDARD_PARAM_DEF(uint, unsigned int, "%u", kstrtouint);
258STANDARD_PARAM_DEF(long, long, "%li", kstrtol);
259STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", kstrtoul);
Hannes Reineckeb4210b82014-06-25 15:27:37 +0200260STANDARD_PARAM_DEF(ullong, unsigned long long, "%llu", kstrtoull);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600262int param_set_charp(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (strlen(val) > 1024) {
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600265 pr_err("%s: string parameter too long\n", kp->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -ENOSPC;
267 }
268
Jani Nikula91f9d332014-08-27 06:22:23 +0930269 param_check_unsafe(kp);
270
Rusty Russella1054322010-08-11 23:04:18 -0600271 maybe_kfree_parameter(*(char **)kp->arg);
272
273 /* This is a hack. We can't kmalloc in early boot, and we
Rusty Russelle180a6b2009-03-31 13:05:29 -0600274 * don't need to; this mangled commandline is preserved. */
275 if (slab_is_available()) {
Rusty Russella1054322010-08-11 23:04:18 -0600276 *(char **)kp->arg = kmalloc_parameter(strlen(val)+1);
Rusty Russelld553ad82009-10-29 08:56:17 -0600277 if (!*(char **)kp->arg)
Rusty Russelle180a6b2009-03-31 13:05:29 -0600278 return -ENOMEM;
Rusty Russella1054322010-08-11 23:04:18 -0600279 strcpy(*(char **)kp->arg, val);
Rusty Russelle180a6b2009-03-31 13:05:29 -0600280 } else
281 *(const char **)kp->arg = val;
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
284}
Rusty Russella14fe242010-08-11 23:04:11 -0600285EXPORT_SYMBOL(param_set_charp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600287int param_get_charp(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Chen Gangf4940ab2013-08-20 15:35:04 +0930289 return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
Rusty Russella14fe242010-08-11 23:04:11 -0600291EXPORT_SYMBOL(param_get_charp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Rusty Russella1054322010-08-11 23:04:18 -0600293static void param_free_charp(void *arg)
294{
295 maybe_kfree_parameter(*((char **)arg));
296}
297
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600298struct kernel_param_ops param_ops_charp = {
299 .set = param_set_charp,
300 .get = param_get_charp,
Rusty Russella1054322010-08-11 23:04:18 -0600301 .free = param_free_charp,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600302};
303EXPORT_SYMBOL(param_ops_charp);
304
Rusty Russellfddd5202009-06-12 21:46:57 -0600305/* Actually could be a bool or an int, for historical reasons. */
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600306int param_set_bool(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
Jani Nikula91f9d332014-08-27 06:22:23 +0930308 param_check_unsafe(kp);
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 /* No equals means "set"... */
311 if (!val) val = "1";
312
313 /* One of =[yYnN01] */
Rusty Russell8b825282012-03-26 12:50:51 +1030314 return strtobool(val, kp->arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
Rusty Russella14fe242010-08-11 23:04:11 -0600316EXPORT_SYMBOL(param_set_bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600318int param_get_bool(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
320 /* Y and N chosen as being relatively non-coder friendly */
Rusty Russell8b825282012-03-26 12:50:51 +1030321 return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322}
Rusty Russella14fe242010-08-11 23:04:11 -0600323EXPORT_SYMBOL(param_get_bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600325struct kernel_param_ops param_ops_bool = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930326 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600327 .set = param_set_bool,
328 .get = param_get_bool,
329};
330EXPORT_SYMBOL(param_ops_bool);
331
Rusty Russellfddd5202009-06-12 21:46:57 -0600332/* This one must be bool. */
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600333int param_set_invbool(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Rusty Russellfddd5202009-06-12 21:46:57 -0600335 int ret;
336 bool boolval;
Jan Beulich22e48ea2007-10-16 23:29:34 -0700337 struct kernel_param dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Jani Nikula91f9d332014-08-27 06:22:23 +0930339 param_check_unsafe(kp);
340
Jan Beulich22e48ea2007-10-16 23:29:34 -0700341 dummy.arg = &boolval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 ret = param_set_bool(val, &dummy);
343 if (ret == 0)
Rusty Russell9a71af22009-06-12 21:46:53 -0600344 *(bool *)kp->arg = !boolval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return ret;
346}
Rusty Russella14fe242010-08-11 23:04:11 -0600347EXPORT_SYMBOL(param_set_invbool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600349int param_get_invbool(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
Rusty Russell9a71af22009-06-12 21:46:53 -0600351 return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
Rusty Russella14fe242010-08-11 23:04:11 -0600353EXPORT_SYMBOL(param_get_invbool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600355struct kernel_param_ops param_ops_invbool = {
356 .set = param_set_invbool,
357 .get = param_get_invbool,
358};
359EXPORT_SYMBOL(param_ops_invbool);
360
Rusty Russell69116f22012-01-13 09:32:17 +1030361int param_set_bint(const char *val, const struct kernel_param *kp)
362{
363 struct kernel_param boolkp;
364 bool v;
365 int ret;
366
Jani Nikula91f9d332014-08-27 06:22:23 +0930367 param_check_unsafe(kp);
368
Rusty Russell69116f22012-01-13 09:32:17 +1030369 /* Match bool exactly, by re-using it. */
370 boolkp = *kp;
371 boolkp.arg = &v;
Rusty Russell69116f22012-01-13 09:32:17 +1030372
373 ret = param_set_bool(val, &boolkp);
374 if (ret == 0)
375 *(int *)kp->arg = v;
376 return ret;
377}
378EXPORT_SYMBOL(param_set_bint);
379
380struct kernel_param_ops param_ops_bint = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930381 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Rusty Russell69116f22012-01-13 09:32:17 +1030382 .set = param_set_bint,
383 .get = param_get_int,
384};
385EXPORT_SYMBOL(param_ops_bint);
386
Bert Wesarg9730b5b2007-05-08 00:28:50 -0700387/* We break the rule and mangle the string. */
Adrian Bunk98717282006-03-25 03:07:06 -0800388static int param_array(const char *name,
389 const char *val,
390 unsigned int min, unsigned int max,
391 void *elem, int elemsize,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600392 int (*set)(const char *, const struct kernel_param *kp),
Pawel Moll026cee02012-03-26 12:50:51 +1030393 s16 level,
Richard Knutssoneb38a992008-02-06 01:37:50 -0800394 unsigned int *num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 int ret;
397 struct kernel_param kp;
398 char save;
399
400 /* Get the name right for errors. */
401 kp.name = name;
402 kp.arg = elem;
Pawel Moll026cee02012-03-26 12:50:51 +1030403 kp.level = level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 *num = 0;
406 /* We expect a comma-separated list of values. */
407 do {
408 int len;
409
410 if (*num == max) {
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600411 pr_err("%s: can only take %i arguments\n", name, max);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return -EINVAL;
413 }
414 len = strcspn(val, ",");
415
416 /* nul-terminate and parse */
417 save = val[len];
418 ((char *)val)[len] = '\0';
Rusty Russell907b29e2010-08-11 23:04:19 -0600419 BUG_ON(!mutex_is_locked(&param_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 ret = set(val, &kp);
421
422 if (ret != 0)
423 return ret;
424 kp.arg += elemsize;
425 val += len+1;
426 (*num)++;
427 } while (save == ',');
428
429 if (*num < min) {
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600430 pr_err("%s: needs at least %i arguments\n", name, min);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return -EINVAL;
432 }
433 return 0;
434}
435
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600436static int param_array_set(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700438 const struct kparam_array *arr = kp->arr;
Bert Wesarg31143a12005-04-16 15:25:42 -0700439 unsigned int temp_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 return param_array(kp->name, val, 1, arr->max, arr->elem,
Pawel Moll026cee02012-03-26 12:50:51 +1030442 arr->elemsize, arr->ops->set, kp->level,
Rusty Russell3c7d76e2009-10-29 08:56:19 -0600443 arr->num ?: &temp_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}
445
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600446static int param_array_get(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
448 int i, off, ret;
Jan Beulich22e48ea2007-10-16 23:29:34 -0700449 const struct kparam_array *arr = kp->arr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct kernel_param p;
451
452 p = *kp;
453 for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
454 if (i)
455 buffer[off++] = ',';
456 p.arg = arr->elem + arr->elemsize * i;
Rusty Russell907b29e2010-08-11 23:04:19 -0600457 BUG_ON(!mutex_is_locked(&param_lock));
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600458 ret = arr->ops->get(buffer + off, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 if (ret < 0)
460 return ret;
461 off += ret;
462 }
463 buffer[off] = '\0';
464 return off;
465}
466
Rusty Russelle6df34a2010-08-11 23:04:17 -0600467static void param_array_free(void *arg)
468{
469 unsigned int i;
470 const struct kparam_array *arr = arg;
471
472 if (arr->ops->free)
473 for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
474 arr->ops->free(arr->elem + arr->elemsize * i);
475}
476
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600477struct kernel_param_ops param_array_ops = {
478 .set = param_array_set,
479 .get = param_array_get,
Rusty Russelle6df34a2010-08-11 23:04:17 -0600480 .free = param_array_free,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600481};
482EXPORT_SYMBOL(param_array_ops);
483
484int param_set_copystring(const char *val, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700486 const struct kparam_string *kps = kp->str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Jani Nikula91f9d332014-08-27 06:22:23 +0930488 param_check_unsafe(kp);
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 if (strlen(val)+1 > kps->maxlen) {
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600491 pr_err("%s: string doesn't fit in %u chars.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 kp->name, kps->maxlen-1);
493 return -ENOSPC;
494 }
495 strcpy(kps->string, val);
496 return 0;
497}
Rusty Russella14fe242010-08-11 23:04:11 -0600498EXPORT_SYMBOL(param_set_copystring);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600500int param_get_string(char *buffer, const struct kernel_param *kp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Jan Beulich22e48ea2007-10-16 23:29:34 -0700502 const struct kparam_string *kps = kp->str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 return strlcpy(buffer, kps->string, kps->maxlen);
504}
Rusty Russella14fe242010-08-11 23:04:11 -0600505EXPORT_SYMBOL(param_get_string);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600507struct kernel_param_ops param_ops_string = {
508 .set = param_set_copystring,
509 .get = param_get_string,
510};
511EXPORT_SYMBOL(param_ops_string);
512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513/* sysfs output in /sys/modules/XYZ/parameters/ */
Edward Z. Yang350f8252010-02-01 18:26:59 -0500514#define to_module_attr(n) container_of(n, struct module_attribute, attr)
515#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517extern struct kernel_param __start___param[], __stop___param[];
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519struct param_attribute
520{
521 struct module_attribute mattr;
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600522 const struct kernel_param *param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523};
524
525struct module_param_attrs
526{
Rusty Russell9b473de2008-10-22 10:00:22 -0500527 unsigned int num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 struct attribute_group grp;
529 struct param_attribute attrs[0];
530};
531
Randy Dunlapef665c12007-02-13 15:19:06 -0800532#ifdef CONFIG_SYSFS
Edward Z. Yang350f8252010-02-01 18:26:59 -0500533#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535static ssize_t param_attr_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930536 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537{
538 int count;
539 struct param_attribute *attribute = to_param_attr(mattr);
540
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600541 if (!attribute->param->ops->get)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return -EPERM;
543
Rusty Russell907b29e2010-08-11 23:04:19 -0600544 mutex_lock(&param_lock);
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600545 count = attribute->param->ops->get(buf, attribute->param);
Rusty Russell907b29e2010-08-11 23:04:19 -0600546 mutex_unlock(&param_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (count > 0) {
548 strcat(buf, "\n");
549 ++count;
550 }
551 return count;
552}
553
554/* sysfs always hands a nul-terminated string in buf. We rely on that. */
555static ssize_t param_attr_store(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930556 struct module_kobject *km,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 const char *buf, size_t len)
558{
559 int err;
560 struct param_attribute *attribute = to_param_attr(mattr);
561
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600562 if (!attribute->param->ops->set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 return -EPERM;
564
Rusty Russell907b29e2010-08-11 23:04:19 -0600565 mutex_lock(&param_lock);
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600566 err = attribute->param->ops->set(buf, attribute->param);
Rusty Russell907b29e2010-08-11 23:04:19 -0600567 mutex_unlock(&param_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if (!err)
569 return len;
570 return err;
571}
Randy Dunlapef665c12007-02-13 15:19:06 -0800572#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574#ifdef CONFIG_MODULES
575#define __modinit
576#else
577#define __modinit __init
578#endif
579
Randy Dunlapef665c12007-02-13 15:19:06 -0800580#ifdef CONFIG_SYSFS
Rusty Russell907b29e2010-08-11 23:04:19 -0600581void __kernel_param_lock(void)
582{
583 mutex_lock(&param_lock);
584}
585EXPORT_SYMBOL(__kernel_param_lock);
586
587void __kernel_param_unlock(void)
588{
589 mutex_unlock(&param_lock);
590}
591EXPORT_SYMBOL(__kernel_param_unlock);
592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593/*
Rusty Russell9b473de2008-10-22 10:00:22 -0500594 * add_sysfs_param - add a parameter to sysfs
595 * @mk: struct module_kobject
596 * @kparam: the actual parameter definition to add to sysfs
597 * @name: name of parameter
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 *
Rusty Russell9b473de2008-10-22 10:00:22 -0500599 * Create a kobject if for a (per-module) parameter if mp NULL, and
600 * create file in sysfs. Returns an error on out of memory. Always cleans up
601 * if there's an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 */
Rusty Russell9b473de2008-10-22 10:00:22 -0500603static __modinit int add_sysfs_param(struct module_kobject *mk,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600604 const struct kernel_param *kp,
Rusty Russell9b473de2008-10-22 10:00:22 -0500605 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
Rusty Russell9b473de2008-10-22 10:00:22 -0500607 struct module_param_attrs *new;
608 struct attribute **attrs;
609 int err, num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Rusty Russell9b473de2008-10-22 10:00:22 -0500611 /* We don't bother calling this with invisible parameters. */
612 BUG_ON(!kp->perm);
613
614 if (!mk->mp) {
615 num = 0;
616 attrs = NULL;
617 } else {
618 num = mk->mp->num;
619 attrs = mk->mp->grp.attrs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621
Rusty Russell9b473de2008-10-22 10:00:22 -0500622 /* Enlarge. */
623 new = krealloc(mk->mp,
624 sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
625 GFP_KERNEL);
626 if (!new) {
David Woodhouse636621392013-03-14 13:23:11 +0000627 kfree(attrs);
Rusty Russell9b473de2008-10-22 10:00:22 -0500628 err = -ENOMEM;
629 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 }
David Woodhouse636621392013-03-14 13:23:11 +0000631 /* Despite looking like the typical realloc() bug, this is safe.
632 * We *want* the old 'attrs' to be freed either way, and we'll store
633 * the new one in the success case. */
Rusty Russell9b473de2008-10-22 10:00:22 -0500634 attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
635 if (!attrs) {
636 err = -ENOMEM;
637 goto fail_free_new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 }
Rusty Russell9b473de2008-10-22 10:00:22 -0500639
640 /* Sysfs wants everything zeroed. */
641 memset(new, 0, sizeof(*new));
642 memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
643 memset(&attrs[num], 0, sizeof(attrs[num]));
644 new->grp.name = "parameters";
645 new->grp.attrs = attrs;
646
647 /* Tack new one on the end. */
Eric W. Biedermana07e4152010-02-11 15:23:05 -0800648 sysfs_attr_init(&new->attrs[num].mattr.attr);
Rusty Russell9b473de2008-10-22 10:00:22 -0500649 new->attrs[num].param = kp;
650 new->attrs[num].mattr.show = param_attr_show;
651 new->attrs[num].mattr.store = param_attr_store;
652 new->attrs[num].mattr.attr.name = (char *)name;
653 new->attrs[num].mattr.attr.mode = kp->perm;
654 new->num = num+1;
655
656 /* Fix up all the pointers, since krealloc can move us */
657 for (num = 0; num < new->num; num++)
658 new->grp.attrs[num] = &new->attrs[num].mattr.attr;
659 new->grp.attrs[num] = NULL;
660
661 mk->mp = new;
662 return 0;
663
664fail_free_new:
665 kfree(new);
666fail:
667 mk->mp = NULL;
668 return err;
669}
670
Linus Torvaldsd2441182008-10-23 12:07:17 -0700671#ifdef CONFIG_MODULES
Rusty Russell9b473de2008-10-22 10:00:22 -0500672static void free_module_param_attrs(struct module_kobject *mk)
673{
674 kfree(mk->mp->grp.attrs);
675 kfree(mk->mp);
676 mk->mp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677}
678
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679/*
680 * module_param_sysfs_setup - setup sysfs support for one module
681 * @mod: module
682 * @kparam: module parameters (array)
683 * @num_params: number of module parameters
684 *
Rusty Russell9b473de2008-10-22 10:00:22 -0500685 * Adds sysfs entries for module parameters under
686 * /sys/module/[mod->name]/parameters/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 */
688int module_param_sysfs_setup(struct module *mod,
Rusty Russell9bbb9e52010-08-11 23:04:12 -0600689 const struct kernel_param *kparam,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 unsigned int num_params)
691{
Rusty Russell9b473de2008-10-22 10:00:22 -0500692 int i, err;
693 bool params = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Rusty Russell9b473de2008-10-22 10:00:22 -0500695 for (i = 0; i < num_params; i++) {
696 if (kparam[i].perm == 0)
697 continue;
698 err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
699 if (err)
700 return err;
701 params = true;
702 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Rusty Russell9b473de2008-10-22 10:00:22 -0500704 if (!params)
705 return 0;
706
707 /* Create the param group. */
708 err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
709 if (err)
710 free_module_param_attrs(&mod->mkobj);
711 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712}
713
714/*
715 * module_param_sysfs_remove - remove sysfs support for one module
716 * @mod: module
717 *
718 * Remove sysfs entries for module parameters and the corresponding
719 * kobject.
720 */
721void module_param_sysfs_remove(struct module *mod)
722{
Rusty Russell9b473de2008-10-22 10:00:22 -0500723 if (mod->mkobj.mp) {
724 sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 /* We are positive that no one is using any param
726 * attrs at this point. Deallocate immediately. */
Rusty Russell9b473de2008-10-22 10:00:22 -0500727 free_module_param_attrs(&mod->mkobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 }
729}
730#endif
731
Rusty Russelle180a6b2009-03-31 13:05:29 -0600732void destroy_params(const struct kernel_param *params, unsigned num)
733{
Rusty Russelle6df34a2010-08-11 23:04:17 -0600734 unsigned int i;
735
736 for (i = 0; i < num; i++)
737 if (params[i].ops->free)
738 params[i].ops->free(params[i].arg);
Rusty Russelle180a6b2009-03-31 13:05:29 -0600739}
740
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800741static struct module_kobject * __init locate_module_kobject(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
743 struct module_kobject *mk;
Rusty Russell9b473de2008-10-22 10:00:22 -0500744 struct kobject *kobj;
745 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Rusty Russell9b473de2008-10-22 10:00:22 -0500747 kobj = kset_find_obj(module_kset, name);
748 if (kobj) {
Rusty Russell9b473de2008-10-22 10:00:22 -0500749 mk = to_module_kobject(kobj);
Rusty Russell9b473de2008-10-22 10:00:22 -0500750 } else {
751 mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
752 BUG_ON(!mk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Rusty Russell9b473de2008-10-22 10:00:22 -0500754 mk->mod = THIS_MODULE;
755 mk->kobj.kset = module_kset;
756 err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
757 "%s", name);
Kay Sievers88bfa322011-07-24 22:06:04 +0930758#ifdef CONFIG_MODULES
759 if (!err)
760 err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
761#endif
Rusty Russell9b473de2008-10-22 10:00:22 -0500762 if (err) {
763 kobject_put(&mk->kobj);
Jim Cromieb5f3abf2012-05-03 18:22:44 -0600764 pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n",
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800765 name, err);
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800766 return NULL;
Rusty Russell9b473de2008-10-22 10:00:22 -0500767 }
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800768
769 /* So that we hold reference in both cases. */
Rusty Russell9b473de2008-10-22 10:00:22 -0500770 kobject_get(&mk->kobj);
Greg Kroah-Hartman74c5b592007-07-30 11:26:38 -0700771 }
Rusty Russell9b473de2008-10-22 10:00:22 -0500772
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800773 return mk;
774}
775
776static void __init kernel_add_sysfs_param(const char *name,
777 struct kernel_param *kparam,
778 unsigned int name_skip)
779{
780 struct module_kobject *mk;
781 int err;
782
783 mk = locate_module_kobject(name);
784 if (!mk)
785 return;
786
787 /* We need to remove old parameters before adding more. */
788 if (mk->mp)
789 sysfs_remove_group(&mk->kobj, &mk->mp->grp);
790
Rusty Russell9b473de2008-10-22 10:00:22 -0500791 /* These should not fail at boot. */
792 err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
793 BUG_ON(err);
794 err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
795 BUG_ON(err);
Kay Sieversf30c53a2007-01-15 20:22:02 +0100796 kobject_uevent(&mk->kobj, KOBJ_ADD);
Rusty Russell9b473de2008-10-22 10:00:22 -0500797 kobject_put(&mk->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798}
799
800/*
Jean Delvareb634d132013-07-02 15:35:11 +0930801 * param_sysfs_builtin - add sysfs parameters for built-in modules
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 *
803 * Add module_parameters to sysfs for "modules" built into the kernel.
804 *
805 * The "module" name (KBUILD_MODNAME) is stored before a dot, the
806 * "parameter" name is stored behind a dot in kernel_param->name. So,
807 * extract the "module" name for all built-in kernel_param-eters,
Rusty Russell9b473de2008-10-22 10:00:22 -0500808 * and for all who have the same, call kernel_add_sysfs_param.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 */
810static void __init param_sysfs_builtin(void)
811{
Rusty Russell9b473de2008-10-22 10:00:22 -0500812 struct kernel_param *kp;
813 unsigned int name_len;
814 char modname[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
Rusty Russell9b473de2008-10-22 10:00:22 -0500816 for (kp = __start___param; kp < __stop___param; kp++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 char *dot;
818
Rusty Russell9b473de2008-10-22 10:00:22 -0500819 if (kp->perm == 0)
820 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Rusty Russell730b69d2008-10-22 10:00:22 -0500822 dot = strchr(kp->name, '.');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 if (!dot) {
Rusty Russell67e67ce2008-10-22 10:00:23 -0500824 /* This happens for core_param() */
825 strcpy(modname, "kernel");
826 name_len = 0;
827 } else {
828 name_len = dot - kp->name + 1;
829 strlcpy(modname, kp->name, name_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 }
Rusty Russell67e67ce2008-10-22 10:00:23 -0500831 kernel_add_sysfs_param(modname, kp, name_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833}
834
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800835ssize_t __modver_version_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930836 struct module_kobject *mk, char *buf)
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800837{
838 struct module_version_attribute *vattr =
839 container_of(mattr, struct module_version_attribute, mattr);
840
Chen Gangf4940ab2013-08-20 15:35:04 +0930841 return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800842}
843
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800844extern const struct module_version_attribute *__start___modver[];
845extern const struct module_version_attribute *__stop___modver[];
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800846
847static void __init version_sysfs_builtin(void)
848{
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800849 const struct module_version_attribute **p;
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800850 struct module_kobject *mk;
851 int err;
852
Dmitry Torokhovb4bc84282011-02-07 16:02:25 -0800853 for (p = __start___modver; p < __stop___modver; p++) {
854 const struct module_version_attribute *vattr = *p;
855
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800856 mk = locate_module_kobject(vattr->module_name);
857 if (mk) {
858 err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
859 kobject_uevent(&mk->kobj, KOBJ_ADD);
860 kobject_put(&mk->kobj);
861 }
862 }
863}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
865/* module-related sysfs stuff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867static ssize_t module_attr_show(struct kobject *kobj,
868 struct attribute *attr,
869 char *buf)
870{
871 struct module_attribute *attribute;
872 struct module_kobject *mk;
873 int ret;
874
875 attribute = to_module_attr(attr);
876 mk = to_module_kobject(kobj);
877
878 if (!attribute->show)
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500879 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Kay Sievers4befb022011-07-24 22:06:04 +0930881 ret = attribute->show(attribute, mk, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 return ret;
884}
885
886static ssize_t module_attr_store(struct kobject *kobj,
887 struct attribute *attr,
888 const char *buf, size_t len)
889{
890 struct module_attribute *attribute;
891 struct module_kobject *mk;
892 int ret;
893
894 attribute = to_module_attr(attr);
895 mk = to_module_kobject(kobj);
896
897 if (!attribute->store)
Dmitry Torokhov70f28172005-04-29 01:27:34 -0500898 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Kay Sievers4befb022011-07-24 22:06:04 +0930900 ret = attribute->store(attribute, mk, buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 return ret;
903}
904
Emese Revfy52cf25d2010-01-19 02:58:23 +0100905static const struct sysfs_ops module_sysfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 .show = module_attr_show,
907 .store = module_attr_store,
908};
909
Kay Sievers270a6c42007-01-18 13:26:15 +0100910static int uevent_filter(struct kset *kset, struct kobject *kobj)
911{
912 struct kobj_type *ktype = get_ktype(kobj);
913
914 if (ktype == &module_ktype)
915 return 1;
916 return 0;
917}
918
Emese Revfy9cd43612009-12-31 14:52:51 +0100919static const struct kset_uevent_ops module_uevent_ops = {
Kay Sievers270a6c42007-01-18 13:26:15 +0100920 .filter = uevent_filter,
921};
922
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700923struct kset *module_kset;
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700924int module_sysfs_initialized;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Li Zhong942e4432013-09-03 16:33:57 +0930926static void module_kobj_release(struct kobject *kobj)
927{
928 struct module_kobject *mk = to_module_kobject(kobj);
929 complete(mk->kobj_completion);
930}
931
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700932struct kobj_type module_ktype = {
Li Zhong942e4432013-09-03 16:33:57 +0930933 .release = module_kobj_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 .sysfs_ops = &module_sysfs_ops,
935};
936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937/*
938 * param_sysfs_init - wrapper for built-in params support
939 */
940static int __init param_sysfs_init(void)
941{
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700942 module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
943 if (!module_kset) {
944 printk(KERN_WARNING "%s (%d): error creating kset\n",
945 __FILE__, __LINE__);
946 return -ENOMEM;
Randy Dunlapd8c76492006-09-29 01:58:55 -0700947 }
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -0700948 module_sysfs_initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
Dmitry Torokhove94965e2010-12-15 14:00:19 -0800950 version_sysfs_builtin();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 param_sysfs_builtin();
952
953 return 0;
954}
Mark Huangd10be6d2006-09-29 01:59:34 -0700955subsys_initcall(param_sysfs_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Greg Kroah-Hartman7405c1e2007-11-01 10:39:50 -0700957#endif /* CONFIG_SYSFS */