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)) { | |
61 | DEBUGP("They are equal! Calling %p\n", | |
62 | params[i].set); | |
63 | return params[i].set(val, ¶ms[i]); | |
64 | } | |
65 | } | |
66 | ||
67 | if (handle_unknown) { | |
68 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); | |
69 | return handle_unknown(param, val); | |
70 | } | |
71 | ||
72 | DEBUGP("Unknown argument `%s'\n", param); | |
73 | return -ENOENT; | |
74 | } | |
75 | ||
76 | /* You can use " around spaces, but can't escape ". */ | |
77 | /* Hyphens and underscores equivalent in parameter names. */ | |
78 | static char *next_arg(char *args, char **param, char **val) | |
79 | { | |
80 | unsigned int i, equals = 0; | |
81 | int in_quote = 0, quoted = 0; | |
82 | char *next; | |
83 | ||
1da177e4 LT |
84 | if (*args == '"') { |
85 | args++; | |
86 | in_quote = 1; | |
87 | quoted = 1; | |
88 | } | |
89 | ||
90 | for (i = 0; args[i]; i++) { | |
26d052bf | 91 | if (isspace(args[i]) && !in_quote) |
1da177e4 LT |
92 | break; |
93 | if (equals == 0) { | |
94 | if (args[i] == '=') | |
95 | equals = i; | |
96 | } | |
97 | if (args[i] == '"') | |
98 | in_quote = !in_quote; | |
99 | } | |
100 | ||
101 | *param = args; | |
102 | if (!equals) | |
103 | *val = NULL; | |
104 | else { | |
105 | args[equals] = '\0'; | |
106 | *val = args + equals + 1; | |
107 | ||
108 | /* Don't include quotes in value. */ | |
109 | if (**val == '"') { | |
110 | (*val)++; | |
111 | if (args[i-1] == '"') | |
112 | args[i-1] = '\0'; | |
113 | } | |
114 | if (quoted && args[i-1] == '"') | |
115 | args[i-1] = '\0'; | |
116 | } | |
117 | ||
118 | if (args[i]) { | |
119 | args[i] = '\0'; | |
120 | next = args + i + 1; | |
121 | } else | |
122 | next = args + i; | |
f36462f0 RR |
123 | |
124 | /* Chew up trailing spaces. */ | |
26d052bf | 125 | while (isspace(*next)) |
f36462f0 | 126 | next++; |
1da177e4 LT |
127 | return next; |
128 | } | |
129 | ||
130 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
131 | int parse_args(const char *name, | |
132 | char *args, | |
133 | struct kernel_param *params, | |
134 | unsigned num, | |
135 | int (*unknown)(char *param, char *val)) | |
136 | { | |
137 | char *param, *val; | |
138 | ||
139 | DEBUGP("Parsing ARGS: %s\n", args); | |
140 | ||
f36462f0 | 141 | /* Chew leading spaces */ |
26d052bf | 142 | while (isspace(*args)) |
f36462f0 RR |
143 | args++; |
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 LT |
186 | \ |
187 | if (!val) return -EINVAL; \ | |
06b2a76d YY |
188 | ret = strtolfn(val, 0, &l); \ |
189 | if (ret == -EINVAL || ((type)l != l)) \ | |
1da177e4 LT |
190 | return -EINVAL; \ |
191 | *((type *)kp->arg) = l; \ | |
192 | return 0; \ | |
193 | } \ | |
194 | int param_get_##name(char *buffer, struct kernel_param *kp) \ | |
195 | { \ | |
196 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
197 | } | |
198 | ||
06b2a76d YY |
199 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
200 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); | |
201 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); | |
202 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); | |
203 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); | |
204 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); | |
205 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); | |
1da177e4 LT |
206 | |
207 | int param_set_charp(const char *val, struct kernel_param *kp) | |
208 | { | |
209 | if (!val) { | |
210 | printk(KERN_ERR "%s: string parameter expected\n", | |
211 | kp->name); | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | if (strlen(val) > 1024) { | |
216 | printk(KERN_ERR "%s: string parameter too long\n", | |
217 | kp->name); | |
218 | return -ENOSPC; | |
219 | } | |
220 | ||
45fcc70c | 221 | if (kp->flags & KPARAM_KMALLOCED) |
e180a6b7 RR |
222 | kfree(*(char **)kp->arg); |
223 | ||
224 | /* This is a hack. We can't need to strdup in early boot, and we | |
225 | * don't need to; this mangled commandline is preserved. */ | |
226 | if (slab_is_available()) { | |
45fcc70c | 227 | kp->flags |= KPARAM_KMALLOCED; |
e180a6b7 RR |
228 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
229 | if (!kp->arg) | |
230 | return -ENOMEM; | |
231 | } else | |
232 | *(const char **)kp->arg = val; | |
233 | ||
1da177e4 LT |
234 | return 0; |
235 | } | |
236 | ||
237 | int param_get_charp(char *buffer, struct kernel_param *kp) | |
238 | { | |
239 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
240 | } | |
241 | ||
fddd5201 | 242 | /* Actually could be a bool or an int, for historical reasons. */ |
1da177e4 LT |
243 | int param_set_bool(const char *val, struct kernel_param *kp) |
244 | { | |
fddd5201 RR |
245 | bool v; |
246 | ||
1da177e4 LT |
247 | /* No equals means "set"... */ |
248 | if (!val) val = "1"; | |
249 | ||
250 | /* One of =[yYnN01] */ | |
251 | switch (val[0]) { | |
252 | case 'y': case 'Y': case '1': | |
fddd5201 RR |
253 | v = true; |
254 | break; | |
1da177e4 | 255 | case 'n': case 'N': case '0': |
fddd5201 RR |
256 | v = false; |
257 | break; | |
258 | default: | |
259 | return -EINVAL; | |
1da177e4 | 260 | } |
fddd5201 RR |
261 | |
262 | if (kp->flags & KPARAM_ISBOOL) | |
263 | *(bool *)kp->arg = v; | |
264 | else | |
265 | *(int *)kp->arg = v; | |
266 | return 0; | |
1da177e4 LT |
267 | } |
268 | ||
269 | int param_get_bool(char *buffer, struct kernel_param *kp) | |
270 | { | |
fddd5201 RR |
271 | bool val; |
272 | if (kp->flags & KPARAM_ISBOOL) | |
273 | val = *(bool *)kp->arg; | |
274 | else | |
275 | val = *(int *)kp->arg; | |
276 | ||
1da177e4 | 277 | /* Y and N chosen as being relatively non-coder friendly */ |
fddd5201 | 278 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
1da177e4 LT |
279 | } |
280 | ||
fddd5201 | 281 | /* This one must be bool. */ |
1da177e4 LT |
282 | int param_set_invbool(const char *val, struct kernel_param *kp) |
283 | { | |
fddd5201 RR |
284 | int ret; |
285 | bool boolval; | |
22e48eaf | 286 | struct kernel_param dummy; |
1da177e4 | 287 | |
22e48eaf | 288 | dummy.arg = &boolval; |
fddd5201 | 289 | dummy.flags = KPARAM_ISBOOL; |
1da177e4 LT |
290 | ret = param_set_bool(val, &dummy); |
291 | if (ret == 0) | |
9a71af2c | 292 | *(bool *)kp->arg = !boolval; |
1da177e4 LT |
293 | return ret; |
294 | } | |
295 | ||
296 | int param_get_invbool(char *buffer, struct kernel_param *kp) | |
297 | { | |
9a71af2c | 298 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
1da177e4 LT |
299 | } |
300 | ||
9730b5b0 | 301 | /* We break the rule and mangle the string. */ |
9871728b AB |
302 | static int param_array(const char *name, |
303 | const char *val, | |
304 | unsigned int min, unsigned int max, | |
305 | void *elem, int elemsize, | |
306 | int (*set)(const char *, struct kernel_param *kp), | |
eb38a996 | 307 | unsigned int *num) |
1da177e4 LT |
308 | { |
309 | int ret; | |
310 | struct kernel_param kp; | |
311 | char save; | |
312 | ||
313 | /* Get the name right for errors. */ | |
314 | kp.name = name; | |
315 | kp.arg = elem; | |
316 | ||
317 | /* No equals sign? */ | |
318 | if (!val) { | |
319 | printk(KERN_ERR "%s: expects arguments\n", name); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | *num = 0; | |
324 | /* We expect a comma-separated list of values. */ | |
325 | do { | |
326 | int len; | |
327 | ||
328 | if (*num == max) { | |
329 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
330 | name, max); | |
331 | return -EINVAL; | |
332 | } | |
333 | len = strcspn(val, ","); | |
334 | ||
335 | /* nul-terminate and parse */ | |
336 | save = val[len]; | |
337 | ((char *)val)[len] = '\0'; | |
338 | ret = set(val, &kp); | |
339 | ||
340 | if (ret != 0) | |
341 | return ret; | |
342 | kp.arg += elemsize; | |
343 | val += len+1; | |
344 | (*num)++; | |
345 | } while (save == ','); | |
346 | ||
347 | if (*num < min) { | |
348 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
349 | name, min); | |
350 | return -EINVAL; | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
355 | int param_array_set(const char *val, struct kernel_param *kp) | |
356 | { | |
22e48eaf | 357 | const struct kparam_array *arr = kp->arr; |
31143a12 | 358 | unsigned int temp_num; |
1da177e4 LT |
359 | |
360 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
31143a12 | 361 | arr->elemsize, arr->set, arr->num ?: &temp_num); |
1da177e4 LT |
362 | } |
363 | ||
364 | int param_array_get(char *buffer, struct kernel_param *kp) | |
365 | { | |
366 | int i, off, ret; | |
22e48eaf | 367 | const struct kparam_array *arr = kp->arr; |
1da177e4 LT |
368 | struct kernel_param p; |
369 | ||
370 | p = *kp; | |
371 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
372 | if (i) | |
373 | buffer[off++] = ','; | |
374 | p.arg = arr->elem + arr->elemsize * i; | |
375 | ret = arr->get(buffer + off, &p); | |
376 | if (ret < 0) | |
377 | return ret; | |
378 | off += ret; | |
379 | } | |
380 | buffer[off] = '\0'; | |
381 | return off; | |
382 | } | |
383 | ||
384 | int param_set_copystring(const char *val, struct kernel_param *kp) | |
385 | { | |
22e48eaf | 386 | const struct kparam_string *kps = kp->str; |
1da177e4 | 387 | |
fe20e581 RD |
388 | if (!val) { |
389 | printk(KERN_ERR "%s: missing param set value\n", kp->name); | |
390 | return -EINVAL; | |
391 | } | |
1da177e4 LT |
392 | if (strlen(val)+1 > kps->maxlen) { |
393 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
394 | kp->name, kps->maxlen-1); | |
395 | return -ENOSPC; | |
396 | } | |
397 | strcpy(kps->string, val); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | int param_get_string(char *buffer, struct kernel_param *kp) | |
402 | { | |
22e48eaf | 403 | const struct kparam_string *kps = kp->str; |
1da177e4 LT |
404 | return strlcpy(buffer, kps->string, kps->maxlen); |
405 | } | |
406 | ||
407 | /* sysfs output in /sys/modules/XYZ/parameters/ */ | |
9b473de8 RR |
408 | #define to_module_attr(n) container_of(n, struct module_attribute, attr); |
409 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); | |
1da177e4 LT |
410 | |
411 | extern struct kernel_param __start___param[], __stop___param[]; | |
412 | ||
1da177e4 LT |
413 | struct param_attribute |
414 | { | |
415 | struct module_attribute mattr; | |
416 | struct kernel_param *param; | |
417 | }; | |
418 | ||
419 | struct module_param_attrs | |
420 | { | |
9b473de8 | 421 | unsigned int num; |
1da177e4 LT |
422 | struct attribute_group grp; |
423 | struct param_attribute attrs[0]; | |
424 | }; | |
425 | ||
ef665c1a | 426 | #ifdef CONFIG_SYSFS |
1da177e4 LT |
427 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr); |
428 | ||
429 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
430 | struct module *mod, char *buf) | |
431 | { | |
432 | int count; | |
433 | struct param_attribute *attribute = to_param_attr(mattr); | |
434 | ||
435 | if (!attribute->param->get) | |
436 | return -EPERM; | |
437 | ||
438 | count = attribute->param->get(buf, attribute->param); | |
439 | if (count > 0) { | |
440 | strcat(buf, "\n"); | |
441 | ++count; | |
442 | } | |
443 | return count; | |
444 | } | |
445 | ||
446 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
447 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
448 | struct module *owner, | |
449 | const char *buf, size_t len) | |
450 | { | |
451 | int err; | |
452 | struct param_attribute *attribute = to_param_attr(mattr); | |
453 | ||
454 | if (!attribute->param->set) | |
455 | return -EPERM; | |
456 | ||
457 | err = attribute->param->set(buf, attribute->param); | |
458 | if (!err) | |
459 | return len; | |
460 | return err; | |
461 | } | |
ef665c1a | 462 | #endif |
1da177e4 LT |
463 | |
464 | #ifdef CONFIG_MODULES | |
465 | #define __modinit | |
466 | #else | |
467 | #define __modinit __init | |
468 | #endif | |
469 | ||
ef665c1a | 470 | #ifdef CONFIG_SYSFS |
1da177e4 | 471 | /* |
9b473de8 RR |
472 | * add_sysfs_param - add a parameter to sysfs |
473 | * @mk: struct module_kobject | |
474 | * @kparam: the actual parameter definition to add to sysfs | |
475 | * @name: name of parameter | |
1da177e4 | 476 | * |
9b473de8 RR |
477 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
478 | * create file in sysfs. Returns an error on out of memory. Always cleans up | |
479 | * if there's an error. | |
1da177e4 | 480 | */ |
9b473de8 RR |
481 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
482 | struct kernel_param *kp, | |
483 | const char *name) | |
1da177e4 | 484 | { |
9b473de8 RR |
485 | struct module_param_attrs *new; |
486 | struct attribute **attrs; | |
487 | int err, num; | |
488 | ||
489 | /* We don't bother calling this with invisible parameters. */ | |
490 | BUG_ON(!kp->perm); | |
491 | ||
492 | if (!mk->mp) { | |
493 | num = 0; | |
494 | attrs = NULL; | |
495 | } else { | |
496 | num = mk->mp->num; | |
497 | attrs = mk->mp->grp.attrs; | |
1da177e4 LT |
498 | } |
499 | ||
9b473de8 RR |
500 | /* Enlarge. */ |
501 | new = krealloc(mk->mp, | |
502 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), | |
503 | GFP_KERNEL); | |
504 | if (!new) { | |
505 | kfree(mk->mp); | |
506 | err = -ENOMEM; | |
507 | goto fail; | |
508 | } | |
509 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); | |
510 | if (!attrs) { | |
511 | err = -ENOMEM; | |
512 | goto fail_free_new; | |
513 | } | |
1da177e4 | 514 | |
9b473de8 RR |
515 | /* Sysfs wants everything zeroed. */ |
516 | memset(new, 0, sizeof(*new)); | |
517 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); | |
518 | memset(&attrs[num], 0, sizeof(attrs[num])); | |
519 | new->grp.name = "parameters"; | |
520 | new->grp.attrs = attrs; | |
521 | ||
522 | /* Tack new one on the end. */ | |
523 | new->attrs[num].param = kp; | |
524 | new->attrs[num].mattr.show = param_attr_show; | |
525 | new->attrs[num].mattr.store = param_attr_store; | |
526 | new->attrs[num].mattr.attr.name = (char *)name; | |
527 | new->attrs[num].mattr.attr.mode = kp->perm; | |
528 | new->num = num+1; | |
529 | ||
530 | /* Fix up all the pointers, since krealloc can move us */ | |
531 | for (num = 0; num < new->num; num++) | |
532 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; | |
533 | new->grp.attrs[num] = NULL; | |
534 | ||
535 | mk->mp = new; | |
536 | return 0; | |
1da177e4 | 537 | |
9b473de8 RR |
538 | fail_free_new: |
539 | kfree(new); | |
540 | fail: | |
541 | mk->mp = NULL; | |
542 | return err; | |
543 | } | |
1da177e4 | 544 | |
d2441183 | 545 | #ifdef CONFIG_MODULES |
9b473de8 RR |
546 | static void free_module_param_attrs(struct module_kobject *mk) |
547 | { | |
548 | kfree(mk->mp->grp.attrs); | |
549 | kfree(mk->mp); | |
550 | mk->mp = NULL; | |
1da177e4 LT |
551 | } |
552 | ||
1da177e4 LT |
553 | /* |
554 | * module_param_sysfs_setup - setup sysfs support for one module | |
555 | * @mod: module | |
556 | * @kparam: module parameters (array) | |
557 | * @num_params: number of module parameters | |
558 | * | |
9b473de8 RR |
559 | * Adds sysfs entries for module parameters under |
560 | * /sys/module/[mod->name]/parameters/ | |
1da177e4 LT |
561 | */ |
562 | int module_param_sysfs_setup(struct module *mod, | |
563 | struct kernel_param *kparam, | |
564 | unsigned int num_params) | |
565 | { | |
9b473de8 RR |
566 | int i, err; |
567 | bool params = false; | |
568 | ||
569 | for (i = 0; i < num_params; i++) { | |
570 | if (kparam[i].perm == 0) | |
571 | continue; | |
572 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); | |
573 | if (err) | |
574 | return err; | |
575 | params = true; | |
576 | } | |
1da177e4 | 577 | |
9b473de8 RR |
578 | if (!params) |
579 | return 0; | |
1da177e4 | 580 | |
9b473de8 RR |
581 | /* Create the param group. */ |
582 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
583 | if (err) | |
584 | free_module_param_attrs(&mod->mkobj); | |
585 | return err; | |
1da177e4 LT |
586 | } |
587 | ||
588 | /* | |
589 | * module_param_sysfs_remove - remove sysfs support for one module | |
590 | * @mod: module | |
591 | * | |
592 | * Remove sysfs entries for module parameters and the corresponding | |
593 | * kobject. | |
594 | */ | |
595 | void module_param_sysfs_remove(struct module *mod) | |
596 | { | |
9b473de8 RR |
597 | if (mod->mkobj.mp) { |
598 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); | |
1da177e4 LT |
599 | /* We are positive that no one is using any param |
600 | * attrs at this point. Deallocate immediately. */ | |
9b473de8 | 601 | free_module_param_attrs(&mod->mkobj); |
1da177e4 LT |
602 | } |
603 | } | |
604 | #endif | |
605 | ||
e180a6b7 RR |
606 | void destroy_params(const struct kernel_param *params, unsigned num) |
607 | { | |
608 | unsigned int i; | |
609 | ||
610 | for (i = 0; i < num; i++) | |
45fcc70c | 611 | if (params[i].flags & KPARAM_KMALLOCED) |
e180a6b7 RR |
612 | kfree(*(char **)params[i].arg); |
613 | } | |
614 | ||
9b473de8 RR |
615 | static void __init kernel_add_sysfs_param(const char *name, |
616 | struct kernel_param *kparam, | |
617 | unsigned int name_skip) | |
1da177e4 LT |
618 | { |
619 | struct module_kobject *mk; | |
9b473de8 RR |
620 | struct kobject *kobj; |
621 | int err; | |
1da177e4 | 622 | |
9b473de8 RR |
623 | kobj = kset_find_obj(module_kset, name); |
624 | if (kobj) { | |
625 | /* We already have one. Remove params so we can add more. */ | |
626 | mk = to_module_kobject(kobj); | |
627 | /* We need to remove it before adding parameters. */ | |
628 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); | |
629 | } else { | |
630 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
631 | BUG_ON(!mk); | |
632 | ||
633 | mk->mod = THIS_MODULE; | |
634 | mk->kobj.kset = module_kset; | |
635 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, | |
636 | "%s", name); | |
637 | if (err) { | |
638 | kobject_put(&mk->kobj); | |
639 | printk(KERN_ERR "Module '%s' failed add to sysfs, " | |
640 | "error number %d\n", name, err); | |
641 | printk(KERN_ERR "The system will be unstable now.\n"); | |
642 | return; | |
643 | } | |
644 | /* So that exit path is even. */ | |
645 | kobject_get(&mk->kobj); | |
74c5b597 | 646 | } |
9b473de8 RR |
647 | |
648 | /* These should not fail at boot. */ | |
649 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); | |
650 | BUG_ON(err); | |
651 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); | |
652 | BUG_ON(err); | |
f30c53a8 | 653 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
9b473de8 | 654 | kobject_put(&mk->kobj); |
1da177e4 LT |
655 | } |
656 | ||
657 | /* | |
658 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
659 | * | |
660 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
661 | * | |
662 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
663 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
664 | * extract the "module" name for all built-in kernel_param-eters, | |
9b473de8 | 665 | * and for all who have the same, call kernel_add_sysfs_param. |
1da177e4 LT |
666 | */ |
667 | static void __init param_sysfs_builtin(void) | |
668 | { | |
9b473de8 RR |
669 | struct kernel_param *kp; |
670 | unsigned int name_len; | |
671 | char modname[MODULE_NAME_LEN]; | |
1da177e4 | 672 | |
9b473de8 | 673 | for (kp = __start___param; kp < __stop___param; kp++) { |
1da177e4 LT |
674 | char *dot; |
675 | ||
9b473de8 RR |
676 | if (kp->perm == 0) |
677 | continue; | |
1da177e4 | 678 | |
730b69d2 | 679 | dot = strchr(kp->name, '.'); |
1da177e4 | 680 | if (!dot) { |
67e67cea RR |
681 | /* This happens for core_param() */ |
682 | strcpy(modname, "kernel"); | |
683 | name_len = 0; | |
684 | } else { | |
685 | name_len = dot - kp->name + 1; | |
686 | strlcpy(modname, kp->name, name_len); | |
1da177e4 | 687 | } |
67e67cea | 688 | kernel_add_sysfs_param(modname, kp, name_len); |
1da177e4 | 689 | } |
1da177e4 LT |
690 | } |
691 | ||
692 | ||
693 | /* module-related sysfs stuff */ | |
1da177e4 | 694 | |
1da177e4 LT |
695 | static ssize_t module_attr_show(struct kobject *kobj, |
696 | struct attribute *attr, | |
697 | char *buf) | |
698 | { | |
699 | struct module_attribute *attribute; | |
700 | struct module_kobject *mk; | |
701 | int ret; | |
702 | ||
703 | attribute = to_module_attr(attr); | |
704 | mk = to_module_kobject(kobj); | |
705 | ||
706 | if (!attribute->show) | |
70f2817a | 707 | return -EIO; |
1da177e4 | 708 | |
1da177e4 LT |
709 | ret = attribute->show(attribute, mk->mod, buf); |
710 | ||
1da177e4 LT |
711 | return ret; |
712 | } | |
713 | ||
714 | static ssize_t module_attr_store(struct kobject *kobj, | |
715 | struct attribute *attr, | |
716 | const char *buf, size_t len) | |
717 | { | |
718 | struct module_attribute *attribute; | |
719 | struct module_kobject *mk; | |
720 | int ret; | |
721 | ||
722 | attribute = to_module_attr(attr); | |
723 | mk = to_module_kobject(kobj); | |
724 | ||
725 | if (!attribute->store) | |
70f2817a | 726 | return -EIO; |
1da177e4 | 727 | |
1da177e4 LT |
728 | ret = attribute->store(attribute, mk->mod, buf, len); |
729 | ||
1da177e4 LT |
730 | return ret; |
731 | } | |
732 | ||
733 | static struct sysfs_ops module_sysfs_ops = { | |
734 | .show = module_attr_show, | |
735 | .store = module_attr_store, | |
736 | }; | |
737 | ||
270a6c4c KS |
738 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
739 | { | |
740 | struct kobj_type *ktype = get_ktype(kobj); | |
741 | ||
742 | if (ktype == &module_ktype) | |
743 | return 1; | |
744 | return 0; | |
745 | } | |
746 | ||
747 | static struct kset_uevent_ops module_uevent_ops = { | |
748 | .filter = uevent_filter, | |
749 | }; | |
750 | ||
7405c1e1 | 751 | struct kset *module_kset; |
823bccfc | 752 | int module_sysfs_initialized; |
1da177e4 | 753 | |
7405c1e1 | 754 | struct kobj_type module_ktype = { |
1da177e4 LT |
755 | .sysfs_ops = &module_sysfs_ops, |
756 | }; | |
757 | ||
1da177e4 LT |
758 | /* |
759 | * param_sysfs_init - wrapper for built-in params support | |
760 | */ | |
761 | static int __init param_sysfs_init(void) | |
762 | { | |
7405c1e1 GKH |
763 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
764 | if (!module_kset) { | |
765 | printk(KERN_WARNING "%s (%d): error creating kset\n", | |
766 | __FILE__, __LINE__); | |
767 | return -ENOMEM; | |
d8c7649e | 768 | } |
823bccfc | 769 | module_sysfs_initialized = 1; |
1da177e4 LT |
770 | |
771 | param_sysfs_builtin(); | |
772 | ||
773 | return 0; | |
774 | } | |
d10be6d1 | 775 | subsys_initcall(param_sysfs_init); |
1da177e4 | 776 | |
7405c1e1 | 777 | #endif /* CONFIG_SYSFS */ |
ef665c1a | 778 | |
1da177e4 LT |
779 | EXPORT_SYMBOL(param_set_byte); |
780 | EXPORT_SYMBOL(param_get_byte); | |
781 | EXPORT_SYMBOL(param_set_short); | |
782 | EXPORT_SYMBOL(param_get_short); | |
783 | EXPORT_SYMBOL(param_set_ushort); | |
784 | EXPORT_SYMBOL(param_get_ushort); | |
785 | EXPORT_SYMBOL(param_set_int); | |
786 | EXPORT_SYMBOL(param_get_int); | |
787 | EXPORT_SYMBOL(param_set_uint); | |
788 | EXPORT_SYMBOL(param_get_uint); | |
789 | EXPORT_SYMBOL(param_set_long); | |
790 | EXPORT_SYMBOL(param_get_long); | |
791 | EXPORT_SYMBOL(param_set_ulong); | |
792 | EXPORT_SYMBOL(param_get_ulong); | |
793 | EXPORT_SYMBOL(param_set_charp); | |
794 | EXPORT_SYMBOL(param_get_charp); | |
795 | EXPORT_SYMBOL(param_set_bool); | |
796 | EXPORT_SYMBOL(param_get_bool); | |
797 | EXPORT_SYMBOL(param_set_invbool); | |
798 | EXPORT_SYMBOL(param_get_invbool); | |
799 | EXPORT_SYMBOL(param_array_set); | |
800 | EXPORT_SYMBOL(param_array_get); | |
801 | EXPORT_SYMBOL(param_set_copystring); | |
802 | EXPORT_SYMBOL(param_get_string); |