~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/moduleparam.h

Version: ~ [ linux-5.5-rc7 ] ~ [ linux-5.4.13 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.97 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.166 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.210 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.210 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #ifndef _LINUX_MODULE_PARAMS_H
  2 #define _LINUX_MODULE_PARAMS_H
  3 /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */
  4 #include <linux/init.h>
  5 #include <linux/stringify.h>
  6 #include <linux/kernel.h>
  7 
  8 /* You can override this manually, but generally this should match the
  9    module name. */
 10 #ifdef MODULE
 11 #define MODULE_PARAM_PREFIX /* empty */
 12 #else
 13 #define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
 14 #endif
 15 
 16 /* Chosen so that structs with an unsigned long line up. */
 17 #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
 18 
 19 #define ___module_cat(a,b) __mod_ ## a ## b
 20 #define __module_cat(a,b) ___module_cat(a,b)
 21 #ifdef MODULE
 22 #define __MODULE_INFO(tag, name, info)                                    \
 23 static const char __module_cat(name,__LINE__)[]                           \
 24   __used __attribute__((section(".modinfo"), unused, aligned(1)))         \
 25   = __stringify(tag) "=" info
 26 #else  /* !MODULE */
 27 /* This struct is here for syntactic coherency, it is not used */
 28 #define __MODULE_INFO(tag, name, info)                                    \
 29   struct __module_cat(name,__LINE__) {}
 30 #endif
 31 #define __MODULE_PARM_TYPE(name, _type)                                   \
 32   __MODULE_INFO(parmtype, name##type, #name ":" _type)
 33 
 34 /* One for each parameter, describing how to use it.  Some files do
 35    multiple of these per line, so can't just use MODULE_INFO. */
 36 #define MODULE_PARM_DESC(_parm, desc) \
 37         __MODULE_INFO(parm, _parm, #_parm ":" desc)
 38 
 39 struct kernel_param;
 40 
 41 struct kernel_param_ops {
 42         /* Returns 0, or -errno.  arg is in kp->arg. */
 43         int (*set)(const char *val, const struct kernel_param *kp);
 44         /* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
 45         int (*get)(char *buffer, const struct kernel_param *kp);
 46         /* Optional function to free kp->arg when module unloaded. */
 47         void (*free)(void *arg);
 48 };
 49 
 50 struct kernel_param {
 51         const char *name;
 52         const struct kernel_param_ops *ops;
 53         u16 perm;
 54         s16 level;
 55         union {
 56                 void *arg;
 57                 const struct kparam_string *str;
 58                 const struct kparam_array *arr;
 59         };
 60 };
 61 
 62 /* Special one for strings we want to copy into */
 63 struct kparam_string {
 64         unsigned int maxlen;
 65         char *string;
 66 };
 67 
 68 /* Special one for arrays */
 69 struct kparam_array
 70 {
 71         unsigned int max;
 72         unsigned int elemsize;
 73         unsigned int *num;
 74         const struct kernel_param_ops *ops;
 75         void *elem;
 76 };
 77 
 78 /**
 79  * module_param - typesafe helper for a module/cmdline parameter
 80  * @value: the variable to alter, and exposed parameter name.
 81  * @type: the type of the parameter
 82  * @perm: visibility in sysfs.
 83  *
 84  * @value becomes the module parameter, or (prefixed by KBUILD_MODNAME and a
 85  * ".") the kernel commandline parameter.  Note that - is changed to _, so
 86  * the user can use "foo-bar=1" even for variable "foo_bar".
 87  *
 88  * @perm is 0 if the the variable is not to appear in sysfs, or 0444
 89  * for world-readable, 0644 for root-writable, etc.  Note that if it
 90  * is writable, you may need to use kparam_block_sysfs_write() around
 91  * accesses (esp. charp, which can be kfreed when it changes).
 92  *
 93  * The @type is simply pasted to refer to a param_ops_##type and a
 94  * param_check_##type: for convenience many standard types are provided but
 95  * you can create your own by defining those variables.
 96  *
 97  * Standard types are:
 98  *      byte, short, ushort, int, uint, long, ulong
 99  *      charp: a character pointer
100  *      bool: a bool, values 0/1, y/n, Y/N.
101  *      invbool: the above, only sense-reversed (N = true).
102  */
103 #define module_param(name, type, perm)                          \
104         module_param_named(name, name, type, perm)
105 
106 /**
107  * module_param_named - typesafe helper for a renamed module/cmdline parameter
108  * @name: a valid C identifier which is the parameter name.
109  * @value: the actual lvalue to alter.
110  * @type: the type of the parameter
111  * @perm: visibility in sysfs.
112  *
113  * Usually it's a good idea to have variable names and user-exposed names the
114  * same, but that's harder if the variable must be non-static or is inside a
115  * structure.  This allows exposure under a different name.
116  */
117 #define module_param_named(name, value, type, perm)                        \
118         param_check_##type(name, &(value));                                \
119         module_param_cb(name, &param_ops_##type, &value, perm);            \
120         __MODULE_PARM_TYPE(name, #type)
121 
122 /**
123  * module_param_cb - general callback for a module/cmdline parameter
124  * @name: a valid C identifier which is the parameter name.
125  * @ops: the set & get operations for this parameter.
126  * @perm: visibility in sysfs.
127  *
128  * The ops can have NULL set or get functions.
129  */
130 #define module_param_cb(name, ops, arg, perm)                                 \
131         __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1)
132 
133 /**
134  * <level>_param_cb - general callback for a module/cmdline parameter
135  *                    to be evaluated before certain initcall level
136  * @name: a valid C identifier which is the parameter name.
137  * @ops: the set & get operations for this parameter.
138  * @perm: visibility in sysfs.
139  *
140  * The ops can have NULL set or get functions.
141  */
142 #define __level_param_cb(name, ops, arg, perm, level)                   \
143         __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level)
144 
145 #define core_param_cb(name, ops, arg, perm)             \
146         __level_param_cb(name, ops, arg, perm, 1)
147 
148 #define postcore_param_cb(name, ops, arg, perm)         \
149         __level_param_cb(name, ops, arg, perm, 2)
150 
151 #define arch_param_cb(name, ops, arg, perm)             \
152         __level_param_cb(name, ops, arg, perm, 3)
153 
154 #define subsys_param_cb(name, ops, arg, perm)           \
155         __level_param_cb(name, ops, arg, perm, 4)
156 
157 #define fs_param_cb(name, ops, arg, perm)               \
158         __level_param_cb(name, ops, arg, perm, 5)
159 
160 #define device_param_cb(name, ops, arg, perm)           \
161         __level_param_cb(name, ops, arg, perm, 6)
162 
163 #define late_param_cb(name, ops, arg, perm)             \
164         __level_param_cb(name, ops, arg, perm, 7)
165 
166 /* On alpha, ia64 and ppc64 relocations to global data cannot go into
167    read-only sections (which is part of respective UNIX ABI on these
168    platforms). So 'const' makes no sense and even causes compile failures
169    with some compilers. */
170 #if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
171 #define __moduleparam_const
172 #else
173 #define __moduleparam_const const
174 #endif
175 
176 /* This is the fundamental function for registering boot/module
177    parameters. */
178 #define __module_param_call(prefix, name, ops, arg, perm, level)        \
179         /* Default value instead of permissions? */                     \
180         static int __param_perm_check_##name __attribute__((unused)) =  \
181         BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))  \
182         + BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN);   \
183         static const char __param_str_##name[] = prefix #name;          \
184         static struct kernel_param __moduleparam_const __param_##name   \
185         __used                                                          \
186     __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
187         = { __param_str_##name, ops, perm, level, { arg } }
188 
189 /* Obsolete - use module_param_cb() */
190 #define module_param_call(name, set, get, arg, perm)                    \
191         static struct kernel_param_ops __param_ops_##name =             \
192                  { (void *)set, (void *)get };                          \
193         __module_param_call(MODULE_PARAM_PREFIX,                        \
194                             name, &__param_ops_##name, arg,             \
195                             (perm) + sizeof(__check_old_set_param(set))*0, -1)
196 
197 /* We don't get oldget: it's often a new-style param_get_uint, etc. */
198 static inline int
199 __check_old_set_param(int (*oldset)(const char *, struct kernel_param *))
200 {
201         return 0;
202 }
203 
204 /**
205  * kparam_block_sysfs_write - make sure a parameter isn't written via sysfs.
206  * @name: the name of the parameter
207  *
208  * There's no point blocking write on a paramter that isn't writable via sysfs!
209  */
210 #define kparam_block_sysfs_write(name)                  \
211         do {                                            \
212                 BUG_ON(!(__param_##name.perm & 0222));  \
213                 __kernel_param_lock();                  \
214         } while (0)
215 
216 /**
217  * kparam_unblock_sysfs_write - allows sysfs to write to a parameter again.
218  * @name: the name of the parameter
219  */
220 #define kparam_unblock_sysfs_write(name)                \
221         do {                                            \
222                 BUG_ON(!(__param_##name.perm & 0222));  \
223                 __kernel_param_unlock();                \
224         } while (0)
225 
226 /**
227  * kparam_block_sysfs_read - make sure a parameter isn't read via sysfs.
228  * @name: the name of the parameter
229  *
230  * This also blocks sysfs writes.
231  */
232 #define kparam_block_sysfs_read(name)                   \
233         do {                                            \
234                 BUG_ON(!(__param_##name.perm & 0444));  \
235                 __kernel_param_lock();                  \
236         } while (0)
237 
238 /**
239  * kparam_unblock_sysfs_read - allows sysfs to read a parameter again.
240  * @name: the name of the parameter
241  */
242 #define kparam_unblock_sysfs_read(name)                 \
243         do {                                            \
244                 BUG_ON(!(__param_##name.perm & 0444));  \
245                 __kernel_param_unlock();                \
246         } while (0)
247 
248 #ifdef CONFIG_SYSFS
249 extern void __kernel_param_lock(void);
250 extern void __kernel_param_unlock(void);
251 #else
252 static inline void __kernel_param_lock(void)
253 {
254 }
255 static inline void __kernel_param_unlock(void)
256 {
257 }
258 #endif
259 
260 #ifndef MODULE
261 /**
262  * core_param - define a historical core kernel parameter.
263  * @name: the name of the cmdline and sysfs parameter (often the same as var)
264  * @var: the variable
265  * @type: the type of the parameter
266  * @perm: visibility in sysfs
267  *
268  * core_param is just like module_param(), but cannot be modular and
269  * doesn't add a prefix (such as "printk.").  This is for compatibility
270  * with __setup(), and it makes sense as truly core parameters aren't
271  * tied to the particular file they're in.
272  */
273 #define core_param(name, var, type, perm)                               \
274         param_check_##type(name, &(var));                               \
275         __module_param_call("", name, &param_ops_##type, &var, perm, -1)
276 #endif /* !MODULE */
277 
278 /**
279  * module_param_string - a char array parameter
280  * @name: the name of the parameter
281  * @string: the string variable
282  * @len: the maximum length of the string, incl. terminator
283  * @perm: visibility in sysfs.
284  *
285  * This actually copies the string when it's set (unlike type charp).
286  * @len is usually just sizeof(string).
287  */
288 #define module_param_string(name, string, len, perm)                    \
289         static const struct kparam_string __param_string_##name         \
290                 = { len, string };                                      \
291         __module_param_call(MODULE_PARAM_PREFIX, name,                  \
292                             &param_ops_string,                          \
293                             .str = &__param_string_##name, perm, -1);   \
294         __MODULE_PARM_TYPE(name, "string")
295 
296 /**
297  * parameq - checks if two parameter names match
298  * @name1: parameter name 1
299  * @name2: parameter name 2
300  *
301  * Returns true if the two parameter names are equal.
302  * Dashes (-) are considered equal to underscores (_).
303  */
304 extern bool parameq(const char *name1, const char *name2);
305 
306 /**
307  * parameqn - checks if two parameter names match
308  * @name1: parameter name 1
309  * @name2: parameter name 2
310  * @n: the length to compare
311  *
312  * Similar to parameq(), except it compares @n characters.
313  */
314 extern bool parameqn(const char *name1, const char *name2, size_t n);
315 
316 /* Called on module insert or kernel boot */
317 extern int parse_args(const char *name,
318                       char *args,
319                       const struct kernel_param *params,
320                       unsigned num,
321                       s16 level_min,
322                       s16 level_max,
323                       int (*unknown)(char *param, char *val,
324                               const char *doing));
325 
326 /* Called by module remove. */
327 #ifdef CONFIG_SYSFS
328 extern void destroy_params(const struct kernel_param *params, unsigned num);
329 #else
330 static inline void destroy_params(const struct kernel_param *params,
331                                   unsigned num)
332 {
333 }
334 #endif /* !CONFIG_SYSFS */
335 
336 /* All the helper functions */
337 /* The macros to do compile-time type checking stolen from Jakub
338    Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
339 #define __param_check(name, p, type) \
340         static inline type *__check_##name(void) { return(p); }
341 
342 extern struct kernel_param_ops param_ops_byte;
343 extern int param_set_byte(const char *val, const struct kernel_param *kp);
344 extern int param_get_byte(char *buffer, const struct kernel_param *kp);
345 #define param_check_byte(name, p) __param_check(name, p, unsigned char)
346 
347 extern struct kernel_param_ops param_ops_short;
348 extern int param_set_short(const char *val, const struct kernel_param *kp);
349 extern int param_get_short(char *buffer, const struct kernel_param *kp);
350 #define param_check_short(name, p) __param_check(name, p, short)
351 
352 extern struct kernel_param_ops param_ops_ushort;
353 extern int param_set_ushort(const char *val, const struct kernel_param *kp);
354 extern int param_get_ushort(char *buffer, const struct kernel_param *kp);
355 #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
356 
357 extern struct kernel_param_ops param_ops_int;
358 extern int param_set_int(const char *val, const struct kernel_param *kp);
359 extern int param_get_int(char *buffer, const struct kernel_param *kp);
360 #define param_check_int(name, p) __param_check(name, p, int)
361 
362 extern struct kernel_param_ops param_ops_uint;
363 extern int param_set_uint(const char *val, const struct kernel_param *kp);
364 extern int param_get_uint(char *buffer, const struct kernel_param *kp);
365 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
366 
367 extern struct kernel_param_ops param_ops_long;
368 extern int param_set_long(const char *val, const struct kernel_param *kp);
369 extern int param_get_long(char *buffer, const struct kernel_param *kp);
370 #define param_check_long(name, p) __param_check(name, p, long)
371 
372 extern struct kernel_param_ops param_ops_ulong;
373 extern int param_set_ulong(const char *val, const struct kernel_param *kp);
374 extern int param_get_ulong(char *buffer, const struct kernel_param *kp);
375 #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
376 
377 extern struct kernel_param_ops param_ops_charp;
378 extern int param_set_charp(const char *val, const struct kernel_param *kp);
379 extern int param_get_charp(char *buffer, const struct kernel_param *kp);
380 #define param_check_charp(name, p) __param_check(name, p, char *)
381 
382 /* We used to allow int as well as bool.  We're taking that away! */
383 extern struct kernel_param_ops param_ops_bool;
384 extern int param_set_bool(const char *val, const struct kernel_param *kp);
385 extern int param_get_bool(char *buffer, const struct kernel_param *kp);
386 #define param_check_bool(name, p) __param_check(name, p, bool)
387 
388 extern struct kernel_param_ops param_ops_invbool;
389 extern int param_set_invbool(const char *val, const struct kernel_param *kp);
390 extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
391 #define param_check_invbool(name, p) __param_check(name, p, bool)
392 
393 /* An int, which can only be set like a bool (though it shows as an int). */
394 extern struct kernel_param_ops param_ops_bint;
395 extern int param_set_bint(const char *val, const struct kernel_param *kp);
396 #define param_get_bint param_get_int
397 #define param_check_bint param_check_int
398 
399 /**
400  * module_param_array - a parameter which is an array of some type
401  * @name: the name of the array variable
402  * @type: the type, as per module_param()
403  * @nump: optional pointer filled in with the number written
404  * @perm: visibility in sysfs
405  *
406  * Input and output are as comma-separated values.  Commas inside values
407  * don't work properly (eg. an array of charp).
408  *
409  * ARRAY_SIZE(@name) is used to determine the number of elements in the
410  * array, so the definition must be visible.
411  */
412 #define module_param_array(name, type, nump, perm)              \
413         module_param_array_named(name, name, type, nump, perm)
414 
415 /**
416  * module_param_array_named - renamed parameter which is an array of some type
417  * @name: a valid C identifier which is the parameter name
418  * @array: the name of the array variable
419  * @type: the type, as per module_param()
420  * @nump: optional pointer filled in with the number written
421  * @perm: visibility in sysfs
422  *
423  * This exposes a different name than the actual variable name.  See
424  * module_param_named() for why this might be necessary.
425  */
426 #define module_param_array_named(name, array, type, nump, perm)         \
427         param_check_##type(name, &(array)[0]);                          \
428         static const struct kparam_array __param_arr_##name             \
429         = { .max = ARRAY_SIZE(array), .num = nump,                      \
430             .ops = &param_ops_##type,                                   \
431             .elemsize = sizeof(array[0]), .elem = array };              \
432         __module_param_call(MODULE_PARAM_PREFIX, name,                  \
433                             &param_array_ops,                           \
434                             .arr = &__param_arr_##name,                 \
435                             perm, -1);                                  \
436         __MODULE_PARM_TYPE(name, "array of " #type)
437 
438 extern struct kernel_param_ops param_array_ops;
439 
440 extern struct kernel_param_ops param_ops_string;
441 extern int param_set_copystring(const char *val, const struct kernel_param *);
442 extern int param_get_string(char *buffer, const struct kernel_param *kp);
443 
444 /* for exporting parameters in /sys/parameters */
445 
446 struct module;
447 
448 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
449 extern int module_param_sysfs_setup(struct module *mod,
450                                     const struct kernel_param *kparam,
451                                     unsigned int num_params);
452 
453 extern void module_param_sysfs_remove(struct module *mod);
454 #else
455 static inline int module_param_sysfs_setup(struct module *mod,
456                              const struct kernel_param *kparam,
457                              unsigned int num_params)
458 {
459         return 0;
460 }
461 
462 static inline void module_param_sysfs_remove(struct module *mod)
463 { }
464 #endif
465 
466 #endif /* _LINUX_MODULE_PARAMS_H */
467 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp