Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
1da177e4 LT |
18 | #include <linux/moduleparam.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/err.h> | |
4e57b681 | 25 | #include <linux/slab.h> |
26d052bf | 26 | #include <linux/ctype.h> |
1da177e4 LT |
27 | |
28 | #if 0 | |
29 | #define DEBUGP printk | |
30 | #else | |
31 | #define DEBUGP(fmt, a...) | |
32 | #endif | |
33 | ||
b9e20a92 | 34 | static inline char dash2underscore(char c) |
1da177e4 LT |
35 | { |
36 | if (c == '-') | |
37 | return '_'; | |
38 | return c; | |
39 | } | |
40 | ||
41 | static inline int parameq(const char *input, const char *paramname) | |
42 | { | |
43 | unsigned int i; | |
44 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) | |
45 | if (input[i] == '\0') | |
46 | return 1; | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int parse_one(char *param, | |
51 | char *val, | |
52 | struct kernel_param *params, | |
53 | unsigned num_params, | |
54 | int (*handle_unknown)(char *param, char *val)) | |
55 | { | |
56 | unsigned int i; | |
57 | ||
58 | /* Find parameter */ | |
59 | for (i = 0; i < num_params; i++) { | |
60 | if (parameq(param, params[i].name)) { | |
2e9fb995 RR |
61 | /* Noone handled NULL, so do it here. */ |
62 | if (!val && params[i].set != param_set_bool) | |
63 | return -EINVAL; | |
1da177e4 LT |
64 | DEBUGP("They are equal! Calling %p\n", |
65 | params[i].set); | |
66 | return params[i].set(val, ¶ms[i]); | |
67 | } | |
68 | } | |
69 | ||
70 | if (handle_unknown) { | |
71 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); | |
72 | return handle_unknown(param, val); | |
73 | } | |
74 | ||
75 | DEBUGP("Unknown argument `%s'\n", param); | |
76 | return -ENOENT; | |
77 | } | |
78 | ||
79 | /* You can use " around spaces, but can't escape ". */ | |
80 | /* Hyphens and underscores equivalent in parameter names. */ | |
81 | static char *next_arg(char *args, char **param, char **val) | |
82 | { | |
83 | unsigned int i, equals = 0; | |
84 | int in_quote = 0, quoted = 0; | |
85 | char *next; | |
86 | ||
1da177e4 LT |
87 | if (*args == '"') { |
88 | args++; | |
89 | in_quote = 1; | |
90 | quoted = 1; | |
91 | } | |
92 | ||
93 | for (i = 0; args[i]; i++) { | |
26d052bf | 94 | if (isspace(args[i]) && !in_quote) |
1da177e4 LT |
95 | break; |
96 | if (equals == 0) { | |
97 | if (args[i] == '=') | |
98 | equals = i; | |
99 | } | |
100 | if (args[i] == '"') | |
101 | in_quote = !in_quote; | |
102 | } | |
103 | ||
104 | *param = args; | |
105 | if (!equals) | |
106 | *val = NULL; | |
107 | else { | |
108 | args[equals] = '\0'; | |
109 | *val = args + equals + 1; | |
110 | ||
111 | /* Don't include quotes in value. */ | |
112 | if (**val == '"') { | |
113 | (*val)++; | |
114 | if (args[i-1] == '"') | |
115 | args[i-1] = '\0'; | |
116 | } | |
117 | if (quoted && args[i-1] == '"') | |
118 | args[i-1] = '\0'; | |
119 | } | |
120 | ||
121 | if (args[i]) { | |
122 | args[i] = '\0'; | |
123 | next = args + i + 1; | |
124 | } else | |
125 | next = args + i; | |
f36462f0 RR |
126 | |
127 | /* Chew up trailing spaces. */ | |
e7d2860b | 128 | return skip_spaces(next); |
1da177e4 LT |
129 | } |
130 | ||
131 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
132 | int parse_args(const char *name, | |
133 | char *args, | |
134 | struct kernel_param *params, | |
135 | unsigned num, | |
136 | int (*unknown)(char *param, char *val)) | |
137 | { | |
138 | char *param, *val; | |
139 | ||
140 | DEBUGP("Parsing ARGS: %s\n", args); | |
141 | ||
f36462f0 | 142 | /* Chew leading spaces */ |
e7d2860b | 143 | args = skip_spaces(args); |
f36462f0 | 144 | |
1da177e4 LT |
145 | while (*args) { |
146 | int ret; | |
a416aba6 | 147 | int irq_was_disabled; |
1da177e4 LT |
148 | |
149 | args = next_arg(args, ¶m, &val); | |
a416aba6 | 150 | irq_was_disabled = irqs_disabled(); |
1da177e4 | 151 | ret = parse_one(param, val, params, num, unknown); |
a416aba6 AB |
152 | if (irq_was_disabled && !irqs_disabled()) { |
153 | printk(KERN_WARNING "parse_args(): option '%s' enabled " | |
154 | "irq's!\n", param); | |
155 | } | |
1da177e4 LT |
156 | switch (ret) { |
157 | case -ENOENT: | |
158 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
159 | name, param); | |
160 | return ret; | |
161 | case -ENOSPC: | |
162 | printk(KERN_ERR | |
163 | "%s: `%s' too large for parameter `%s'\n", | |
164 | name, val ?: "", param); | |
165 | return ret; | |
166 | case 0: | |
167 | break; | |
168 | default: | |
169 | printk(KERN_ERR | |
170 | "%s: `%s' invalid for parameter `%s'\n", | |
171 | name, val ?: "", param); | |
172 | return ret; | |
173 | } | |
174 | } | |
175 | ||
176 | /* All parsed OK. */ | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* Lazy bastard, eh? */ | |
181 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
182 | int param_set_##name(const char *val, struct kernel_param *kp) \ | |
183 | { \ | |
1da177e4 | 184 | tmptype l; \ |
06b2a76d | 185 | int ret; \ |
1da177e4 | 186 | \ |
06b2a76d YY |
187 | ret = strtolfn(val, 0, &l); \ |
188 | if (ret == -EINVAL || ((type)l != l)) \ | |
1da177e4 LT |
189 | return -EINVAL; \ |
190 | *((type *)kp->arg) = l; \ | |
191 | return 0; \ | |
192 | } \ | |
193 | int param_get_##name(char *buffer, struct kernel_param *kp) \ | |
194 | { \ | |
195 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
a14fe249 RR |
196 | } \ |
197 | EXPORT_SYMBOL(param_set_##name); \ | |
198 | EXPORT_SYMBOL(param_get_##name) | |
1da177e4 | 199 | |
06b2a76d YY |
200 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
201 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); | |
202 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); | |
203 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); | |
204 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); | |
205 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); | |
206 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); | |
1da177e4 LT |
207 | |
208 | int param_set_charp(const char *val, struct kernel_param *kp) | |
209 | { | |
1da177e4 LT |
210 | if (strlen(val) > 1024) { |
211 | printk(KERN_ERR "%s: string parameter too long\n", | |
212 | kp->name); | |
213 | return -ENOSPC; | |
214 | } | |
215 | ||
e180a6b7 RR |
216 | /* This is a hack. We can't need to strdup in early boot, and we |
217 | * don't need to; this mangled commandline is preserved. */ | |
218 | if (slab_is_available()) { | |
e180a6b7 | 219 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
d553ad86 | 220 | if (!*(char **)kp->arg) |
e180a6b7 RR |
221 | return -ENOMEM; |
222 | } else | |
223 | *(const char **)kp->arg = val; | |
224 | ||
1da177e4 LT |
225 | return 0; |
226 | } | |
a14fe249 | 227 | EXPORT_SYMBOL(param_set_charp); |
1da177e4 LT |
228 | |
229 | int param_get_charp(char *buffer, struct kernel_param *kp) | |
230 | { | |
231 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
232 | } | |
a14fe249 | 233 | EXPORT_SYMBOL(param_get_charp); |
1da177e4 | 234 | |
fddd5201 | 235 | /* Actually could be a bool or an int, for historical reasons. */ |
1da177e4 LT |
236 | int param_set_bool(const char *val, struct kernel_param *kp) |
237 | { | |
fddd5201 RR |
238 | bool v; |
239 | ||
1da177e4 LT |
240 | /* No equals means "set"... */ |
241 | if (!val) val = "1"; | |
242 | ||
243 | /* One of =[yYnN01] */ | |
244 | switch (val[0]) { | |
245 | case 'y': case 'Y': case '1': | |
fddd5201 RR |
246 | v = true; |
247 | break; | |
1da177e4 | 248 | case 'n': case 'N': case '0': |
fddd5201 RR |
249 | v = false; |
250 | break; | |
251 | default: | |
252 | return -EINVAL; | |
1da177e4 | 253 | } |
fddd5201 RR |
254 | |
255 | if (kp->flags & KPARAM_ISBOOL) | |
256 | *(bool *)kp->arg = v; | |
257 | else | |
258 | *(int *)kp->arg = v; | |
259 | return 0; | |
1da177e4 | 260 | } |
a14fe249 | 261 | EXPORT_SYMBOL(param_set_bool); |
1da177e4 LT |
262 | |
263 | int param_get_bool(char *buffer, struct kernel_param *kp) | |
264 | { | |
fddd5201 RR |
265 | bool val; |
266 | if (kp->flags & KPARAM_ISBOOL) | |
267 | val = *(bool *)kp->arg; | |
268 | else | |
269 | val = *(int *)kp->arg; | |
270 | ||
1da177e4 | 271 | /* Y and N chosen as being relatively non-coder friendly */ |
fddd5201 | 272 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
1da177e4 | 273 | } |
a14fe249 | 274 | EXPORT_SYMBOL(param_get_bool); |
1da177e4 | 275 | |
fddd5201 | 276 | /* This one must be bool. */ |
1da177e4 LT |
277 | int param_set_invbool(const char *val, struct kernel_param *kp) |
278 | { | |
fddd5201 RR |
279 | int ret; |
280 | bool boolval; | |
22e48eaf | 281 | struct kernel_param dummy; |
1da177e4 | 282 | |
22e48eaf | 283 | dummy.arg = &boolval; |
fddd5201 | 284 | dummy.flags = KPARAM_ISBOOL; |
1da177e4 LT |
285 | ret = param_set_bool(val, &dummy); |
286 | if (ret == 0) | |
9a71af2c | 287 | *(bool *)kp->arg = !boolval; |
1da177e4 LT |
288 | return ret; |
289 | } | |
a14fe249 | 290 | EXPORT_SYMBOL(param_set_invbool); |
1da177e4 LT |
291 | |
292 | int param_get_invbool(char *buffer, struct kernel_param *kp) | |
293 | { | |
9a71af2c | 294 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
1da177e4 | 295 | } |
a14fe249 | 296 | EXPORT_SYMBOL(param_get_invbool); |
1da177e4 | 297 | |
9730b5b0 | 298 | /* We break the rule and mangle the string. */ |
9871728b AB |
299 | static int param_array(const char *name, |
300 | const char *val, | |
301 | unsigned int min, unsigned int max, | |
302 | void *elem, int elemsize, | |
303 | int (*set)(const char *, struct kernel_param *kp), | |
3c7d76e3 | 304 | u16 flags, |
eb38a996 | 305 | unsigned int *num) |
1da177e4 LT |
306 | { |
307 | int ret; | |
308 | struct kernel_param kp; | |
309 | char save; | |
310 | ||
311 | /* Get the name right for errors. */ | |
312 | kp.name = name; | |
313 | kp.arg = elem; | |
3c7d76e3 | 314 | kp.flags = flags; |
1da177e4 | 315 | |
1da177e4 LT |
316 | *num = 0; |
317 | /* We expect a comma-separated list of values. */ | |
318 | do { | |
319 | int len; | |
320 | ||
321 | if (*num == max) { | |
322 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
323 | name, max); | |
324 | return -EINVAL; | |
325 | } | |
326 | len = strcspn(val, ","); | |
327 | ||
328 | /* nul-terminate and parse */ | |
329 | save = val[len]; | |
330 | ((char *)val)[len] = '\0'; | |
331 | ret = set(val, &kp); | |
332 | ||
333 | if (ret != 0) | |
334 | return ret; | |
335 | kp.arg += elemsize; | |
336 | val += len+1; | |
337 | (*num)++; | |
338 | } while (save == ','); | |
339 | ||
340 | if (*num < min) { | |
341 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
342 | name, min); | |
343 | return -EINVAL; | |
344 | } | |
345 | return 0; | |
346 | } | |
347 | ||
348 | int param_array_set(const char *val, struct kernel_param *kp) | |
349 | { | |
22e48eaf | 350 | const struct kparam_array *arr = kp->arr; |
31143a12 | 351 | unsigned int temp_num; |
1da177e4 LT |
352 | |
353 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
3c7d76e3 RR |
354 | arr->elemsize, arr->set, kp->flags, |
355 | arr->num ?: &temp_num); | |
1da177e4 | 356 | } |
a14fe249 | 357 | EXPORT_SYMBOL(param_array_set); |
1da177e4 LT |
358 | |
359 | int param_array_get(char *buffer, struct kernel_param *kp) | |
360 | { | |
361 | int i, off, ret; | |
22e48eaf | 362 | const struct kparam_array *arr = kp->arr; |
1da177e4 LT |
363 | struct kernel_param p; |
364 | ||
365 | p = *kp; | |
366 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
367 | if (i) | |
368 | buffer[off++] = ','; | |
369 | p.arg = arr->elem + arr->elemsize * i; | |
370 | ret = arr->get(buffer + off, &p); | |
371 | if (ret < 0) | |
372 | return ret; | |
373 | off += ret; | |
374 | } | |
375 | buffer[off] = '\0'; | |
376 | return off; | |
377 | } | |
a14fe249 | 378 | EXPORT_SYMBOL(param_array_get); |
1da177e4 LT |
379 | |
380 | int param_set_copystring(const char *val, struct kernel_param *kp) | |
381 | { | |
22e48eaf | 382 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
383 | |
384 | if (strlen(val)+1 > kps->maxlen) { | |
385 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
386 | kp->name, kps->maxlen-1); | |
387 | return -ENOSPC; | |
388 | } | |
389 | strcpy(kps->string, val); | |
390 | return 0; | |
391 | } | |
a14fe249 | 392 | EXPORT_SYMBOL(param_set_copystring); |
1da177e4 LT |
393 | |
394 | int param_get_string(char *buffer, struct kernel_param *kp) | |
395 | { | |
22e48eaf | 396 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
397 | return strlcpy(buffer, kps->string, kps->maxlen); |
398 | } | |
a14fe249 | 399 | EXPORT_SYMBOL(param_get_string); |
1da177e4 LT |
400 | |
401 | /* sysfs output in /sys/modules/XYZ/parameters/ */ | |
350f8258 EY |
402 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
403 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) | |
1da177e4 LT |
404 | |
405 | extern struct kernel_param __start___param[], __stop___param[]; | |
406 | ||
1da177e4 LT |
407 | struct param_attribute |
408 | { | |
409 | struct module_attribute mattr; | |
410 | struct kernel_param *param; | |
411 | }; | |
412 | ||
413 | struct module_param_attrs | |
414 | { | |
9b473de8 | 415 | unsigned int num; |
1da177e4 LT |
416 | struct attribute_group grp; |
417 | struct param_attribute attrs[0]; | |
418 | }; | |
419 | ||
ef665c1a | 420 | #ifdef CONFIG_SYSFS |
350f8258 | 421 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
1da177e4 LT |
422 | |
423 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
424 | struct module *mod, char *buf) | |
425 | { | |
426 | int count; | |
427 | struct param_attribute *attribute = to_param_attr(mattr); | |
428 | ||
429 | if (!attribute->param->get) | |
430 | return -EPERM; | |
431 | ||
432 | count = attribute->param->get(buf, attribute->param); | |
433 | if (count > 0) { | |
434 | strcat(buf, "\n"); | |
435 | ++count; | |
436 | } | |
437 | return count; | |
438 | } | |
439 | ||
440 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
441 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
442 | struct module *owner, | |
443 | const char *buf, size_t len) | |
444 | { | |
445 | int err; | |
446 | struct param_attribute *attribute = to_param_attr(mattr); | |
447 | ||
448 | if (!attribute->param->set) | |
449 | return -EPERM; | |
450 | ||
451 | err = attribute->param->set(buf, attribute->param); | |
452 | if (!err) | |
453 | return len; | |
454 | return err; | |
455 | } | |
ef665c1a | 456 | #endif |
1da177e4 LT |
457 | |
458 | #ifdef CONFIG_MODULES | |
459 | #define __modinit | |
460 | #else | |
461 | #define __modinit __init | |
462 | #endif | |
463 | ||
ef665c1a | 464 | #ifdef CONFIG_SYSFS |
1da177e4 | 465 | /* |
9b473de8 RR |
466 | * add_sysfs_param - add a parameter to sysfs |
467 | * @mk: struct module_kobject | |
468 | * @kparam: the actual parameter definition to add to sysfs | |
469 | * @name: name of parameter | |
1da177e4 | 470 | * |
9b473de8 RR |
471 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
472 | * create file in sysfs. Returns an error on out of memory. Always cleans up | |
473 | * if there's an error. | |
1da177e4 | 474 | */ |
9b473de8 RR |
475 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
476 | struct kernel_param *kp, | |
477 | const char *name) | |
1da177e4 | 478 | { |
9b473de8 RR |
479 | struct module_param_attrs *new; |
480 | struct attribute **attrs; | |
481 | int err, num; | |
482 | ||
483 | /* We don't bother calling this with invisible parameters. */ | |
484 | BUG_ON(!kp->perm); | |
485 | ||
486 | if (!mk->mp) { | |
487 | num = 0; | |
488 | attrs = NULL; | |
489 | } else { | |
490 | num = mk->mp->num; | |
491 | attrs = mk->mp->grp.attrs; | |
1da177e4 LT |
492 | } |
493 | ||
9b473de8 RR |
494 | /* Enlarge. */ |
495 | new = krealloc(mk->mp, | |
496 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), | |
497 | GFP_KERNEL); | |
498 | if (!new) { | |
499 | kfree(mk->mp); | |
500 | err = -ENOMEM; | |
501 | goto fail; | |
502 | } | |
503 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); | |
504 | if (!attrs) { | |
505 | err = -ENOMEM; | |
506 | goto fail_free_new; | |
507 | } | |
1da177e4 | 508 | |
9b473de8 RR |
509 | /* Sysfs wants everything zeroed. */ |
510 | memset(new, 0, sizeof(*new)); | |
511 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); | |
512 | memset(&attrs[num], 0, sizeof(attrs[num])); | |
513 | new->grp.name = "parameters"; | |
514 | new->grp.attrs = attrs; | |
515 | ||
516 | /* Tack new one on the end. */ | |
a07e4156 | 517 | sysfs_attr_init(&new->attrs[num].mattr.attr); |
9b473de8 RR |
518 | new->attrs[num].param = kp; |
519 | new->attrs[num].mattr.show = param_attr_show; | |
520 | new->attrs[num].mattr.store = param_attr_store; | |
521 | new->attrs[num].mattr.attr.name = (char *)name; | |
522 | new->attrs[num].mattr.attr.mode = kp->perm; | |
523 | new->num = num+1; | |
524 | ||
525 | /* Fix up all the pointers, since krealloc can move us */ | |
526 | for (num = 0; num < new->num; num++) | |
527 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; | |
528 | new->grp.attrs[num] = NULL; | |
529 | ||
530 | mk->mp = new; | |
531 | return 0; | |
1da177e4 | 532 | |
9b473de8 RR |
533 | fail_free_new: |
534 | kfree(new); | |
535 | fail: | |
536 | mk->mp = NULL; | |
537 | return err; | |
538 | } | |
1da177e4 | 539 | |
d2441183 | 540 | #ifdef CONFIG_MODULES |
9b473de8 RR |
541 | static void free_module_param_attrs(struct module_kobject *mk) |
542 | { | |
543 | kfree(mk->mp->grp.attrs); | |
544 | kfree(mk->mp); | |
545 | mk->mp = NULL; | |
1da177e4 LT |
546 | } |
547 | ||
1da177e4 LT |
548 | /* |
549 | * module_param_sysfs_setup - setup sysfs support for one module | |
550 | * @mod: module | |
551 | * @kparam: module parameters (array) | |
552 | * @num_params: number of module parameters | |
553 | * | |
9b473de8 RR |
554 | * Adds sysfs entries for module parameters under |
555 | * /sys/module/[mod->name]/parameters/ | |
1da177e4 LT |
556 | */ |
557 | int module_param_sysfs_setup(struct module *mod, | |
558 | struct kernel_param *kparam, | |
559 | unsigned int num_params) | |
560 | { | |
9b473de8 RR |
561 | int i, err; |
562 | bool params = false; | |
563 | ||
564 | for (i = 0; i < num_params; i++) { | |
565 | if (kparam[i].perm == 0) | |
566 | continue; | |
567 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); | |
568 | if (err) | |
569 | return err; | |
570 | params = true; | |
571 | } | |
1da177e4 | 572 | |
9b473de8 RR |
573 | if (!params) |
574 | return 0; | |
1da177e4 | 575 | |
9b473de8 RR |
576 | /* Create the param group. */ |
577 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
578 | if (err) | |
579 | free_module_param_attrs(&mod->mkobj); | |
580 | return err; | |
1da177e4 LT |
581 | } |
582 | ||
583 | /* | |
584 | * module_param_sysfs_remove - remove sysfs support for one module | |
585 | * @mod: module | |
586 | * | |
587 | * Remove sysfs entries for module parameters and the corresponding | |
588 | * kobject. | |
589 | */ | |
590 | void module_param_sysfs_remove(struct module *mod) | |
591 | { | |
9b473de8 RR |
592 | if (mod->mkobj.mp) { |
593 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
1da177e4 LT |
594 | /* We are positive that no one is using any param |
595 | * attrs at this point. Deallocate immediately. */ | |
9b473de8 | 596 | free_module_param_attrs(&mod->mkobj); |
1da177e4 LT |
597 | } |
598 | } | |
599 | #endif | |
600 | ||
e180a6b7 RR |
601 | void destroy_params(const struct kernel_param *params, unsigned num) |
602 | { | |
65afac7d | 603 | /* FIXME: This should free kmalloced charp parameters. It doesn't. */ |
e180a6b7 RR |
604 | } |
605 | ||
9b473de8 RR |
606 | static void __init kernel_add_sysfs_param(const char *name, |
607 | struct kernel_param *kparam, | |
608 | unsigned int name_skip) | |
1da177e4 LT |
609 | { |
610 | struct module_kobject *mk; | |
9b473de8 RR |
611 | struct kobject *kobj; |
612 | int err; | |
1da177e4 | 613 | |
9b473de8 RR |
614 | kobj = kset_find_obj(module_kset, name); |
615 | if (kobj) { | |
616 | /* We already have one. Remove params so we can add more. */ | |
617 | mk = to_module_kobject(kobj); | |
618 | /* We need to remove it before adding parameters. */ | |
619 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); | |
620 | } else { | |
621 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
622 | BUG_ON(!mk); | |
623 | ||
624 | mk->mod = THIS_MODULE; | |
625 | mk->kobj.kset = module_kset; | |
626 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, | |
627 | "%s", name); | |
628 | if (err) { | |
629 | kobject_put(&mk->kobj); | |
630 | printk(KERN_ERR "Module '%s' failed add to sysfs, " | |
631 | "error number %d\n", name, err); | |
632 | printk(KERN_ERR "The system will be unstable now.\n"); | |
633 | return; | |
634 | } | |
635 | /* So that exit path is even. */ | |
636 | kobject_get(&mk->kobj); | |
74c5b597 | 637 | } |
9b473de8 RR |
638 | |
639 | /* These should not fail at boot. */ | |
640 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); | |
641 | BUG_ON(err); | |
642 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); | |
643 | BUG_ON(err); | |
f30c53a8 | 644 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
9b473de8 | 645 | kobject_put(&mk->kobj); |
1da177e4 LT |
646 | } |
647 | ||
648 | /* | |
649 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
650 | * | |
651 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
652 | * | |
653 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
654 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
655 | * extract the "module" name for all built-in kernel_param-eters, | |
9b473de8 | 656 | * and for all who have the same, call kernel_add_sysfs_param. |
1da177e4 LT |
657 | */ |
658 | static void __init param_sysfs_builtin(void) | |
659 | { | |
9b473de8 RR |
660 | struct kernel_param *kp; |
661 | unsigned int name_len; | |
662 | char modname[MODULE_NAME_LEN]; | |
1da177e4 | 663 | |
9b473de8 | 664 | for (kp = __start___param; kp < __stop___param; kp++) { |
1da177e4 LT |
665 | char *dot; |
666 | ||
9b473de8 RR |
667 | if (kp->perm == 0) |
668 | continue; | |
1da177e4 | 669 | |
730b69d2 | 670 | dot = strchr(kp->name, '.'); |
1da177e4 | 671 | if (!dot) { |
67e67cea RR |
672 | /* This happens for core_param() */ |
673 | strcpy(modname, "kernel"); | |
674 | name_len = 0; | |
675 | } else { | |
676 | name_len = dot - kp->name + 1; | |
677 | strlcpy(modname, kp->name, name_len); | |
1da177e4 | 678 | } |
67e67cea | 679 | kernel_add_sysfs_param(modname, kp, name_len); |
1da177e4 | 680 | } |
1da177e4 LT |
681 | } |
682 | ||
683 | ||
684 | /* module-related sysfs stuff */ | |
1da177e4 | 685 | |
1da177e4 LT |
686 | static ssize_t module_attr_show(struct kobject *kobj, |
687 | struct attribute *attr, | |
688 | char *buf) | |
689 | { | |
690 | struct module_attribute *attribute; | |
691 | struct module_kobject *mk; | |
692 | int ret; | |
693 | ||
694 | attribute = to_module_attr(attr); | |
695 | mk = to_module_kobject(kobj); | |
696 | ||
697 | if (!attribute->show) | |
70f2817a | 698 | return -EIO; |
1da177e4 | 699 | |
1da177e4 LT |
700 | ret = attribute->show(attribute, mk->mod, buf); |
701 | ||
1da177e4 LT |
702 | return ret; |
703 | } | |
704 | ||
705 | static ssize_t module_attr_store(struct kobject *kobj, | |
706 | struct attribute *attr, | |
707 | const char *buf, size_t len) | |
708 | { | |
709 | struct module_attribute *attribute; | |
710 | struct module_kobject *mk; | |
711 | int ret; | |
712 | ||
713 | attribute = to_module_attr(attr); | |
714 | mk = to_module_kobject(kobj); | |
715 | ||
716 | if (!attribute->store) | |
70f2817a | 717 | return -EIO; |
1da177e4 | 718 | |
1da177e4 LT |
719 | ret = attribute->store(attribute, mk->mod, buf, len); |
720 | ||
1da177e4 LT |
721 | return ret; |
722 | } | |
723 | ||
52cf25d0 | 724 | static const struct sysfs_ops module_sysfs_ops = { |
1da177e4 LT |
725 | .show = module_attr_show, |
726 | .store = module_attr_store, | |
727 | }; | |
728 | ||
270a6c4c KS |
729 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
730 | { | |
731 | struct kobj_type *ktype = get_ktype(kobj); | |
732 | ||
733 | if (ktype == &module_ktype) | |
734 | return 1; | |
735 | return 0; | |
736 | } | |
737 | ||
9cd43611 | 738 | static const struct kset_uevent_ops module_uevent_ops = { |
270a6c4c KS |
739 | .filter = uevent_filter, |
740 | }; | |
741 | ||
7405c1e1 | 742 | struct kset *module_kset; |
823bccfc | 743 | int module_sysfs_initialized; |
1da177e4 | 744 | |
7405c1e1 | 745 | struct kobj_type module_ktype = { |
1da177e4 LT |
746 | .sysfs_ops = &module_sysfs_ops, |
747 | }; | |
748 | ||
1da177e4 LT |
749 | /* |
750 | * param_sysfs_init - wrapper for built-in params support | |
751 | */ | |
752 | static int __init param_sysfs_init(void) | |
753 | { | |
7405c1e1 GKH |
754 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
755 | if (!module_kset) { | |
756 | printk(KERN_WARNING "%s (%d): error creating kset\n", | |
757 | __FILE__, __LINE__); | |
758 | return -ENOMEM; | |
d8c7649e | 759 | } |
823bccfc | 760 | module_sysfs_initialized = 1; |
1da177e4 LT |
761 | |
762 | param_sysfs_builtin(); | |
763 | ||
764 | return 0; | |
765 | } | |
d10be6d1 | 766 | subsys_initcall(param_sysfs_init); |
1da177e4 | 767 | |
7405c1e1 | 768 | #endif /* CONFIG_SYSFS */ |