Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/module.h> |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 22 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/device.h> |
| 24 | #include <linux/err.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 25 | #include <linux/slab.h> |
Peter Oberparleiter | 26d052b | 2009-07-06 17:11:22 +0200 | [diff] [blame] | 26 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 28 | #ifdef CONFIG_SYSFS |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 29 | /* Protects all built-in parameters, modules use their own param_lock */ |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 30 | static DEFINE_MUTEX(param_lock); |
| 31 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 32 | /* Use the module's mutex, or if built-in use the built-in mutex */ |
Stephen Rothwell | 20bdc2c | 2015-06-26 13:19:19 +1000 | [diff] [blame^] | 33 | #ifdef CONFIG_MODULES |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 34 | #define KPARAM_MUTEX(mod) ((mod) ? &(mod)->param_lock : ¶m_lock) |
Stephen Rothwell | 20bdc2c | 2015-06-26 13:19:19 +1000 | [diff] [blame^] | 35 | #else |
| 36 | #define KPARAM_MUTEX(mod) (¶m_lock) |
| 37 | #endif |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 38 | |
| 39 | static inline void check_kparam_locked(struct module *mod) |
| 40 | { |
| 41 | BUG_ON(!mutex_is_locked(KPARAM_MUTEX(mod))); |
| 42 | } |
| 43 | #else |
| 44 | static inline void check_kparam_locked(struct module *mod) |
| 45 | { |
| 46 | } |
| 47 | #endif /* !CONFIG_SYSFS */ |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 48 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 49 | /* This just allows us to keep track of which parameters are kmalloced. */ |
| 50 | struct kmalloced_param { |
| 51 | struct list_head list; |
| 52 | char val[]; |
| 53 | }; |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 54 | static LIST_HEAD(kmalloced_params); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 55 | static DEFINE_SPINLOCK(kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 56 | |
| 57 | static void *kmalloc_parameter(unsigned int size) |
| 58 | { |
| 59 | struct kmalloced_param *p; |
| 60 | |
| 61 | p = kmalloc(sizeof(*p) + size, GFP_KERNEL); |
| 62 | if (!p) |
| 63 | return NULL; |
| 64 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 65 | spin_lock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 66 | list_add(&p->list, &kmalloced_params); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 67 | spin_unlock(&kmalloced_params_lock); |
| 68 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 69 | return p->val; |
| 70 | } |
| 71 | |
| 72 | /* Does nothing if parameter wasn't kmalloced above. */ |
| 73 | static void maybe_kfree_parameter(void *param) |
| 74 | { |
| 75 | struct kmalloced_param *p; |
| 76 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 77 | spin_lock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 78 | list_for_each_entry(p, &kmalloced_params, list) { |
| 79 | if (p->val == param) { |
| 80 | list_del(&p->list); |
| 81 | kfree(p); |
| 82 | break; |
| 83 | } |
| 84 | } |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 85 | spin_unlock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 86 | } |
| 87 | |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 88 | static char dash2underscore(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | if (c == '-') |
| 91 | return '_'; |
| 92 | return c; |
| 93 | } |
| 94 | |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 95 | bool parameqn(const char *a, const char *b, size_t n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 97 | size_t i; |
| 98 | |
| 99 | for (i = 0; i < n; i++) { |
| 100 | if (dash2underscore(a[i]) != dash2underscore(b[i])) |
| 101 | return false; |
| 102 | } |
| 103 | return true; |
| 104 | } |
| 105 | |
| 106 | bool parameq(const char *a, const char *b) |
| 107 | { |
| 108 | return parameqn(a, b, strlen(a)+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Rusty Russell | 7a486d3 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 111 | static void param_check_unsafe(const struct kernel_param *kp) |
| 112 | { |
| 113 | if (kp->flags & KERNEL_PARAM_FL_UNSAFE) { |
| 114 | pr_warn("Setting dangerous option %s - tainting kernel\n", |
| 115 | kp->name); |
| 116 | add_taint(TAINT_USER, LOCKDEP_STILL_OK); |
| 117 | } |
| 118 | } |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | static int parse_one(char *param, |
| 121 | char *val, |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 122 | const char *doing, |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 123 | const struct kernel_param *params, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | unsigned num_params, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 125 | s16 min_level, |
| 126 | s16 max_level, |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 127 | int (*handle_unknown)(char *param, char *val, |
| 128 | const char *doing)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
| 130 | unsigned int i; |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 131 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | /* Find parameter */ |
| 134 | for (i = 0; i < num_params; i++) { |
| 135 | if (parameq(param, params[i].name)) { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 136 | if (params[i].level < min_level |
| 137 | || params[i].level > max_level) |
| 138 | return 0; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 139 | /* No one handled NULL, so do it here. */ |
Steven Rostedt | ab013c5 | 2013-08-20 15:33:19 +0930 | [diff] [blame] | 140 | if (!val && |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 141 | !(params[i].ops->flags & KERNEL_PARAM_OPS_FL_NOARG)) |
Rusty Russell | 2e9fb99 | 2010-08-11 23:04:10 -0600 | [diff] [blame] | 142 | return -EINVAL; |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 143 | pr_debug("handling %s with %p\n", param, |
| 144 | params[i].ops->set); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 145 | kernel_param_lock(params[i].mod); |
Rusty Russell | 7a486d3 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 146 | param_check_unsafe(¶ms[i]); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 147 | err = params[i].ops->set(val, ¶ms[i]); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 148 | kernel_param_unlock(params[i].mod); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 149 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | } |
| 152 | |
| 153 | if (handle_unknown) { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 154 | pr_debug("doing %s: %s='%s'\n", doing, param, val); |
| 155 | return handle_unknown(param, val, doing); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 158 | pr_debug("Unknown argument '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | return -ENOENT; |
| 160 | } |
| 161 | |
| 162 | /* You can use " around spaces, but can't escape ". */ |
| 163 | /* Hyphens and underscores equivalent in parameter names. */ |
| 164 | static char *next_arg(char *args, char **param, char **val) |
| 165 | { |
| 166 | unsigned int i, equals = 0; |
| 167 | int in_quote = 0, quoted = 0; |
| 168 | char *next; |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | if (*args == '"') { |
| 171 | args++; |
| 172 | in_quote = 1; |
| 173 | quoted = 1; |
| 174 | } |
| 175 | |
| 176 | for (i = 0; args[i]; i++) { |
Peter Oberparleiter | 26d052b | 2009-07-06 17:11:22 +0200 | [diff] [blame] | 177 | if (isspace(args[i]) && !in_quote) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | break; |
| 179 | if (equals == 0) { |
| 180 | if (args[i] == '=') |
| 181 | equals = i; |
| 182 | } |
| 183 | if (args[i] == '"') |
| 184 | in_quote = !in_quote; |
| 185 | } |
| 186 | |
| 187 | *param = args; |
| 188 | if (!equals) |
| 189 | *val = NULL; |
| 190 | else { |
| 191 | args[equals] = '\0'; |
| 192 | *val = args + equals + 1; |
| 193 | |
| 194 | /* Don't include quotes in value. */ |
| 195 | if (**val == '"') { |
| 196 | (*val)++; |
| 197 | if (args[i-1] == '"') |
| 198 | args[i-1] = '\0'; |
| 199 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | } |
Rusty Russell | b9cc448 | 2015-04-15 13:23:48 +0930 | [diff] [blame] | 201 | if (quoted && args[i-1] == '"') |
| 202 | args[i-1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | if (args[i]) { |
| 205 | args[i] = '\0'; |
| 206 | next = args + i + 1; |
| 207 | } else |
| 208 | next = args + i; |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 209 | |
| 210 | /* Chew up trailing spaces. */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 211 | return skip_spaces(next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 215 | char *parse_args(const char *doing, |
| 216 | char *args, |
| 217 | const struct kernel_param *params, |
| 218 | unsigned num, |
| 219 | s16 min_level, |
| 220 | s16 max_level, |
| 221 | int (*unknown)(char *param, char *val, const char *doing)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
| 223 | char *param, *val; |
| 224 | |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 225 | /* Chew leading spaces */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 226 | args = skip_spaces(args); |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 227 | |
Jim Cromie | 1ef9eaf | 2012-05-03 11:57:37 -0600 | [diff] [blame] | 228 | if (*args) |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 229 | pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | while (*args) { |
| 232 | int ret; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 233 | int irq_was_disabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | args = next_arg(args, ¶m, &val); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 236 | /* Stop at -- */ |
| 237 | if (!val && strcmp(param, "--") == 0) |
| 238 | return args; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 239 | irq_was_disabled = irqs_disabled(); |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 240 | ret = parse_one(param, val, doing, params, num, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 241 | min_level, max_level, unknown); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 242 | if (irq_was_disabled && !irqs_disabled()) |
| 243 | pr_warn("%s: option '%s' enabled irq's!\n", |
| 244 | doing, param); |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | switch (ret) { |
| 247 | case -ENOENT: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 248 | pr_err("%s: Unknown parameter `%s'\n", doing, param); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 249 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | case -ENOSPC: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 251 | pr_err("%s: `%s' too large for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 252 | doing, val ?: "", param); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 253 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | case 0: |
| 255 | break; |
| 256 | default: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 257 | pr_err("%s: `%s' invalid for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 258 | doing, val ?: "", param); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 259 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | } |
| 262 | |
| 263 | /* All parsed OK. */ |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 264 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | /* Lazy bastard, eh? */ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 268 | #define STANDARD_PARAM_DEF(name, type, format, strtolfn) \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 269 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { \ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 271 | return strtolfn(val, 0, (type *)kp->arg); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 273 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | { \ |
Chen Gang | f4940ab7 | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 275 | return scnprintf(buffer, PAGE_SIZE, format, \ |
| 276 | *((type *)kp->arg)); \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 277 | } \ |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 278 | const struct kernel_param_ops param_ops_##name = { \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 279 | .set = param_set_##name, \ |
| 280 | .get = param_get_##name, \ |
| 281 | }; \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 282 | EXPORT_SYMBOL(param_set_##name); \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 283 | EXPORT_SYMBOL(param_get_##name); \ |
| 284 | EXPORT_SYMBOL(param_ops_##name) |
| 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 287 | STANDARD_PARAM_DEF(byte, unsigned char, "%hhu", kstrtou8); |
| 288 | STANDARD_PARAM_DEF(short, short, "%hi", kstrtos16); |
| 289 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", kstrtou16); |
| 290 | STANDARD_PARAM_DEF(int, int, "%i", kstrtoint); |
| 291 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", kstrtouint); |
| 292 | STANDARD_PARAM_DEF(long, long, "%li", kstrtol); |
| 293 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", kstrtoul); |
Hannes Reinecke | b4210b8 | 2014-06-25 15:27:37 +0200 | [diff] [blame] | 294 | STANDARD_PARAM_DEF(ullong, unsigned long long, "%llu", kstrtoull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 296 | int param_set_charp(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | if (strlen(val) > 1024) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 299 | pr_err("%s: string parameter too long\n", kp->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | return -ENOSPC; |
| 301 | } |
| 302 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 303 | maybe_kfree_parameter(*(char **)kp->arg); |
| 304 | |
| 305 | /* This is a hack. We can't kmalloc in early boot, and we |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 306 | * don't need to; this mangled commandline is preserved. */ |
| 307 | if (slab_is_available()) { |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 308 | *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
Rusty Russell | d553ad8 | 2009-10-29 08:56:17 -0600 | [diff] [blame] | 309 | if (!*(char **)kp->arg) |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 310 | return -ENOMEM; |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 311 | strcpy(*(char **)kp->arg, val); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 312 | } else |
| 313 | *(const char **)kp->arg = val; |
| 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | return 0; |
| 316 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 317 | EXPORT_SYMBOL(param_set_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 319 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Chen Gang | f4940ab7 | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 321 | return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 323 | EXPORT_SYMBOL(param_get_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 325 | static void param_free_charp(void *arg) |
| 326 | { |
| 327 | maybe_kfree_parameter(*((char **)arg)); |
| 328 | } |
| 329 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 330 | const struct kernel_param_ops param_ops_charp = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 331 | .set = param_set_charp, |
| 332 | .get = param_get_charp, |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 333 | .free = param_free_charp, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 334 | }; |
| 335 | EXPORT_SYMBOL(param_ops_charp); |
| 336 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 337 | /* Actually could be a bool or an int, for historical reasons. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 338 | int param_set_bool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
| 340 | /* No equals means "set"... */ |
| 341 | if (!val) val = "1"; |
| 342 | |
| 343 | /* One of =[yYnN01] */ |
Rusty Russell | 8b82528 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 344 | return strtobool(val, kp->arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 346 | EXPORT_SYMBOL(param_set_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 348 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
| 350 | /* Y and N chosen as being relatively non-coder friendly */ |
Rusty Russell | 8b82528 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 351 | return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 353 | EXPORT_SYMBOL(param_get_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 355 | const struct kernel_param_ops param_ops_bool = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 356 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 357 | .set = param_set_bool, |
| 358 | .get = param_get_bool, |
| 359 | }; |
| 360 | EXPORT_SYMBOL(param_ops_bool); |
| 361 | |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 362 | int param_set_bool_enable_only(const char *val, const struct kernel_param *kp) |
| 363 | { |
| 364 | int err = 0; |
| 365 | bool new_value; |
| 366 | bool orig_value = *(bool *)kp->arg; |
| 367 | struct kernel_param dummy_kp = *kp; |
| 368 | |
| 369 | dummy_kp.arg = &new_value; |
| 370 | |
| 371 | err = param_set_bool(val, &dummy_kp); |
| 372 | if (err) |
| 373 | return err; |
| 374 | |
| 375 | /* Don't let them unset it once it's set! */ |
| 376 | if (!new_value && orig_value) |
| 377 | return -EROFS; |
| 378 | |
| 379 | if (new_value) |
| 380 | err = param_set_bool(val, kp); |
| 381 | |
| 382 | return err; |
| 383 | } |
| 384 | EXPORT_SYMBOL_GPL(param_set_bool_enable_only); |
| 385 | |
| 386 | const struct kernel_param_ops param_ops_bool_enable_only = { |
| 387 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
| 388 | .set = param_set_bool_enable_only, |
| 389 | .get = param_get_bool, |
| 390 | }; |
Luis R. Rodriguez | 154be21 | 2015-05-27 11:09:39 +0930 | [diff] [blame] | 391 | EXPORT_SYMBOL_GPL(param_ops_bool_enable_only); |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 392 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 393 | /* This one must be bool. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 394 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 396 | int ret; |
| 397 | bool boolval; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 398 | struct kernel_param dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 400 | dummy.arg = &boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | ret = param_set_bool(val, &dummy); |
| 402 | if (ret == 0) |
Rusty Russell | 9a71af2 | 2009-06-12 21:46:53 -0600 | [diff] [blame] | 403 | *(bool *)kp->arg = !boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | return ret; |
| 405 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 406 | EXPORT_SYMBOL(param_set_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 408 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
Rusty Russell | 9a71af2 | 2009-06-12 21:46:53 -0600 | [diff] [blame] | 410 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 412 | EXPORT_SYMBOL(param_get_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 414 | const struct kernel_param_ops param_ops_invbool = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 415 | .set = param_set_invbool, |
| 416 | .get = param_get_invbool, |
| 417 | }; |
| 418 | EXPORT_SYMBOL(param_ops_invbool); |
| 419 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 420 | int param_set_bint(const char *val, const struct kernel_param *kp) |
| 421 | { |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 422 | /* Match bool exactly, by re-using it. */ |
| 423 | struct kernel_param boolkp = *kp; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 424 | bool v; |
| 425 | int ret; |
| 426 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 427 | boolkp.arg = &v; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 428 | |
| 429 | ret = param_set_bool(val, &boolkp); |
| 430 | if (ret == 0) |
| 431 | *(int *)kp->arg = v; |
| 432 | return ret; |
| 433 | } |
| 434 | EXPORT_SYMBOL(param_set_bint); |
| 435 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 436 | const struct kernel_param_ops param_ops_bint = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 437 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 438 | .set = param_set_bint, |
| 439 | .get = param_get_int, |
| 440 | }; |
| 441 | EXPORT_SYMBOL(param_ops_bint); |
| 442 | |
Bert Wesarg | 9730b5b | 2007-05-08 00:28:50 -0700 | [diff] [blame] | 443 | /* We break the rule and mangle the string. */ |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 444 | static int param_array(struct module *mod, |
| 445 | const char *name, |
Adrian Bunk | 9871728 | 2006-03-25 03:07:06 -0800 | [diff] [blame] | 446 | const char *val, |
| 447 | unsigned int min, unsigned int max, |
| 448 | void *elem, int elemsize, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 449 | int (*set)(const char *, const struct kernel_param *kp), |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 450 | s16 level, |
Richard Knutsson | eb38a99 | 2008-02-06 01:37:50 -0800 | [diff] [blame] | 451 | unsigned int *num) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
| 453 | int ret; |
| 454 | struct kernel_param kp; |
| 455 | char save; |
| 456 | |
| 457 | /* Get the name right for errors. */ |
| 458 | kp.name = name; |
| 459 | kp.arg = elem; |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 460 | kp.level = level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | *num = 0; |
| 463 | /* We expect a comma-separated list of values. */ |
| 464 | do { |
| 465 | int len; |
| 466 | |
| 467 | if (*num == max) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 468 | pr_err("%s: can only take %i arguments\n", name, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | return -EINVAL; |
| 470 | } |
| 471 | len = strcspn(val, ","); |
| 472 | |
| 473 | /* nul-terminate and parse */ |
| 474 | save = val[len]; |
| 475 | ((char *)val)[len] = '\0'; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 476 | check_kparam_locked(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | ret = set(val, &kp); |
| 478 | |
| 479 | if (ret != 0) |
| 480 | return ret; |
| 481 | kp.arg += elemsize; |
| 482 | val += len+1; |
| 483 | (*num)++; |
| 484 | } while (save == ','); |
| 485 | |
| 486 | if (*num < min) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 487 | pr_err("%s: needs at least %i arguments\n", name, min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | return -EINVAL; |
| 489 | } |
| 490 | return 0; |
| 491 | } |
| 492 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 493 | static int param_array_set(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 495 | const struct kparam_array *arr = kp->arr; |
Bert Wesarg | 31143a1 | 2005-04-16 15:25:42 -0700 | [diff] [blame] | 496 | unsigned int temp_num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 498 | return param_array(kp->mod, kp->name, val, 1, arr->max, arr->elem, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 499 | arr->elemsize, arr->ops->set, kp->level, |
Rusty Russell | 3c7d76e | 2009-10-29 08:56:19 -0600 | [diff] [blame] | 500 | arr->num ?: &temp_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 503 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | { |
| 505 | int i, off, ret; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 506 | const struct kparam_array *arr = kp->arr; |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 507 | struct kernel_param p = *kp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
| 510 | if (i) |
| 511 | buffer[off++] = ','; |
| 512 | p.arg = arr->elem + arr->elemsize * i; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 513 | check_kparam_locked(p.mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 514 | ret = arr->ops->get(buffer + off, &p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | if (ret < 0) |
| 516 | return ret; |
| 517 | off += ret; |
| 518 | } |
| 519 | buffer[off] = '\0'; |
| 520 | return off; |
| 521 | } |
| 522 | |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 523 | static void param_array_free(void *arg) |
| 524 | { |
| 525 | unsigned int i; |
| 526 | const struct kparam_array *arr = arg; |
| 527 | |
| 528 | if (arr->ops->free) |
| 529 | for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) |
| 530 | arr->ops->free(arr->elem + arr->elemsize * i); |
| 531 | } |
| 532 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 533 | const struct kernel_param_ops param_array_ops = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 534 | .set = param_array_set, |
| 535 | .get = param_array_get, |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 536 | .free = param_array_free, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 537 | }; |
| 538 | EXPORT_SYMBOL(param_array_ops); |
| 539 | |
| 540 | int param_set_copystring(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 542 | const struct kparam_string *kps = kp->str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 544 | if (strlen(val)+1 > kps->maxlen) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 545 | pr_err("%s: string doesn't fit in %u chars.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | kp->name, kps->maxlen-1); |
| 547 | return -ENOSPC; |
| 548 | } |
| 549 | strcpy(kps->string, val); |
| 550 | return 0; |
| 551 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 552 | EXPORT_SYMBOL(param_set_copystring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 554 | int param_get_string(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 556 | const struct kparam_string *kps = kp->str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | return strlcpy(buffer, kps->string, kps->maxlen); |
| 558 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 559 | EXPORT_SYMBOL(param_get_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 561 | const struct kernel_param_ops param_ops_string = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 562 | .set = param_set_copystring, |
| 563 | .get = param_get_string, |
| 564 | }; |
| 565 | EXPORT_SYMBOL(param_ops_string); |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 568 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
| 569 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | struct param_attribute |
| 572 | { |
| 573 | struct module_attribute mattr; |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 574 | const struct kernel_param *param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | }; |
| 576 | |
| 577 | struct module_param_attrs |
| 578 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 579 | unsigned int num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | struct attribute_group grp; |
| 581 | struct param_attribute attrs[0]; |
| 582 | }; |
| 583 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 584 | #ifdef CONFIG_SYSFS |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 585 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | static ssize_t param_attr_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 588 | struct module_kobject *mk, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | int count; |
| 591 | struct param_attribute *attribute = to_param_attr(mattr); |
| 592 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 593 | if (!attribute->param->ops->get) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return -EPERM; |
| 595 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 596 | kernel_param_lock(mk->mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 597 | count = attribute->param->ops->get(buf, attribute->param); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 598 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (count > 0) { |
| 600 | strcat(buf, "\n"); |
| 601 | ++count; |
| 602 | } |
| 603 | return count; |
| 604 | } |
| 605 | |
| 606 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
| 607 | static ssize_t param_attr_store(struct module_attribute *mattr, |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 608 | struct module_kobject *mk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | const char *buf, size_t len) |
| 610 | { |
| 611 | int err; |
| 612 | struct param_attribute *attribute = to_param_attr(mattr); |
| 613 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 614 | if (!attribute->param->ops->set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | return -EPERM; |
| 616 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 617 | kernel_param_lock(mk->mod); |
Rusty Russell | 7a486d3 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 618 | param_check_unsafe(attribute->param); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 619 | err = attribute->param->ops->set(buf, attribute->param); |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 620 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (!err) |
| 622 | return len; |
| 623 | return err; |
| 624 | } |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 625 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | #ifdef CONFIG_MODULES |
| 628 | #define __modinit |
| 629 | #else |
| 630 | #define __modinit __init |
| 631 | #endif |
| 632 | |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 633 | #ifdef CONFIG_SYSFS |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 634 | void kernel_param_lock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 635 | { |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 636 | mutex_lock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 637 | } |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 638 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 639 | void kernel_param_unlock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 640 | { |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 641 | mutex_unlock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 642 | } |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 643 | |
Dan Streetman | b51d23e | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 644 | EXPORT_SYMBOL(kernel_param_lock); |
| 645 | EXPORT_SYMBOL(kernel_param_unlock); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 648 | * add_sysfs_param - add a parameter to sysfs |
| 649 | * @mk: struct module_kobject |
| 650 | * @kparam: the actual parameter definition to add to sysfs |
| 651 | * @name: name of parameter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 653 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
| 654 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
| 655 | * if there's an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 657 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 658 | const struct kernel_param *kp, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 659 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 661 | struct module_param_attrs *new_mp; |
| 662 | struct attribute **new_attrs; |
| 663 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 665 | /* We don't bother calling this with invisible parameters. */ |
| 666 | BUG_ON(!kp->perm); |
| 667 | |
| 668 | if (!mk->mp) { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 669 | /* First allocation. */ |
| 670 | mk->mp = kzalloc(sizeof(*mk->mp), GFP_KERNEL); |
| 671 | if (!mk->mp) |
| 672 | return -ENOMEM; |
| 673 | mk->mp->grp.name = "parameters"; |
| 674 | /* NULL-terminated attribute array. */ |
| 675 | mk->mp->grp.attrs = kzalloc(sizeof(mk->mp->grp.attrs[0]), |
| 676 | GFP_KERNEL); |
| 677 | /* Caller will cleanup via free_module_param_attrs */ |
| 678 | if (!mk->mp->grp.attrs) |
| 679 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 682 | /* Enlarge allocations. */ |
| 683 | new_mp = krealloc(mk->mp, |
| 684 | sizeof(*mk->mp) + |
| 685 | sizeof(mk->mp->attrs[0]) * (mk->mp->num + 1), |
| 686 | GFP_KERNEL); |
| 687 | if (!new_mp) |
| 688 | return -ENOMEM; |
| 689 | mk->mp = new_mp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 690 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 691 | /* Extra pointer for NULL terminator */ |
| 692 | new_attrs = krealloc(mk->mp->grp.attrs, |
| 693 | sizeof(mk->mp->grp.attrs[0]) * (mk->mp->num + 2), |
| 694 | GFP_KERNEL); |
| 695 | if (!new_attrs) |
| 696 | return -ENOMEM; |
| 697 | mk->mp->grp.attrs = new_attrs; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 698 | |
| 699 | /* Tack new one on the end. */ |
Rusty Russell | c772be5 | 2015-01-20 09:07:04 +1030 | [diff] [blame] | 700 | memset(&mk->mp->attrs[mk->mp->num], 0, sizeof(mk->mp->attrs[0])); |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 701 | sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr); |
| 702 | mk->mp->attrs[mk->mp->num].param = kp; |
| 703 | mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show; |
Kees Cook | b0a65b0 | 2014-12-12 13:36:49 +1030 | [diff] [blame] | 704 | /* Do not allow runtime DAC changes to make param writable. */ |
| 705 | if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0) |
| 706 | mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; |
Rusty Russell | 574732c | 2014-12-23 15:05:36 +1030 | [diff] [blame] | 707 | else |
| 708 | mk->mp->attrs[mk->mp->num].mattr.store = NULL; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 709 | mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name; |
| 710 | mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm; |
| 711 | mk->mp->num++; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 712 | |
| 713 | /* Fix up all the pointers, since krealloc can move us */ |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 714 | for (i = 0; i < mk->mp->num; i++) |
| 715 | mk->mp->grp.attrs[i] = &mk->mp->attrs[i].mattr.attr; |
| 716 | mk->mp->grp.attrs[mk->mp->num] = NULL; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 717 | return 0; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 718 | } |
| 719 | |
Linus Torvalds | d244118 | 2008-10-23 12:07:17 -0700 | [diff] [blame] | 720 | #ifdef CONFIG_MODULES |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 721 | static void free_module_param_attrs(struct module_kobject *mk) |
| 722 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 723 | if (mk->mp) |
| 724 | kfree(mk->mp->grp.attrs); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 725 | kfree(mk->mp); |
| 726 | mk->mp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | /* |
| 730 | * module_param_sysfs_setup - setup sysfs support for one module |
| 731 | * @mod: module |
| 732 | * @kparam: module parameters (array) |
| 733 | * @num_params: number of module parameters |
| 734 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 735 | * Adds sysfs entries for module parameters under |
| 736 | * /sys/module/[mod->name]/parameters/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | */ |
| 738 | int module_param_sysfs_setup(struct module *mod, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 739 | const struct kernel_param *kparam, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | unsigned int num_params) |
| 741 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 742 | int i, err; |
| 743 | bool params = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 745 | for (i = 0; i < num_params; i++) { |
| 746 | if (kparam[i].perm == 0) |
| 747 | continue; |
| 748 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 749 | if (err) { |
| 750 | free_module_param_attrs(&mod->mkobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 751 | return err; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 752 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 753 | params = true; |
| 754 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 756 | if (!params) |
| 757 | return 0; |
| 758 | |
| 759 | /* Create the param group. */ |
| 760 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
| 761 | if (err) |
| 762 | free_module_param_attrs(&mod->mkobj); |
| 763 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | /* |
| 767 | * module_param_sysfs_remove - remove sysfs support for one module |
| 768 | * @mod: module |
| 769 | * |
| 770 | * Remove sysfs entries for module parameters and the corresponding |
| 771 | * kobject. |
| 772 | */ |
| 773 | void module_param_sysfs_remove(struct module *mod) |
| 774 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 775 | if (mod->mkobj.mp) { |
| 776 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | /* We are positive that no one is using any param |
| 778 | * attrs at this point. Deallocate immediately. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 779 | free_module_param_attrs(&mod->mkobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | } |
| 782 | #endif |
| 783 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 784 | void destroy_params(const struct kernel_param *params, unsigned num) |
| 785 | { |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 786 | unsigned int i; |
| 787 | |
| 788 | for (i = 0; i < num; i++) |
| 789 | if (params[i].ops->free) |
| 790 | params[i].ops->free(params[i].arg); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 791 | } |
| 792 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 793 | static struct module_kobject * __init locate_module_kobject(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
| 795 | struct module_kobject *mk; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 796 | struct kobject *kobj; |
| 797 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 799 | kobj = kset_find_obj(module_kset, name); |
| 800 | if (kobj) { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 801 | mk = to_module_kobject(kobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 802 | } else { |
| 803 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
| 804 | BUG_ON(!mk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 806 | mk->mod = THIS_MODULE; |
| 807 | mk->kobj.kset = module_kset; |
| 808 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
| 809 | "%s", name); |
Kay Sievers | 88bfa32 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 810 | #ifdef CONFIG_MODULES |
| 811 | if (!err) |
| 812 | err = sysfs_create_file(&mk->kobj, &module_uevent.attr); |
| 813 | #endif |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 814 | if (err) { |
| 815 | kobject_put(&mk->kobj); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 816 | pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n", |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 817 | name, err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 818 | return NULL; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 819 | } |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 820 | |
| 821 | /* So that we hold reference in both cases. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 822 | kobject_get(&mk->kobj); |
Greg Kroah-Hartman | 74c5b59 | 2007-07-30 11:26:38 -0700 | [diff] [blame] | 823 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 824 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 825 | return mk; |
| 826 | } |
| 827 | |
| 828 | static void __init kernel_add_sysfs_param(const char *name, |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 829 | const struct kernel_param *kparam, |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 830 | unsigned int name_skip) |
| 831 | { |
| 832 | struct module_kobject *mk; |
| 833 | int err; |
| 834 | |
| 835 | mk = locate_module_kobject(name); |
| 836 | if (!mk) |
| 837 | return; |
| 838 | |
| 839 | /* We need to remove old parameters before adding more. */ |
| 840 | if (mk->mp) |
| 841 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
| 842 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 843 | /* These should not fail at boot. */ |
| 844 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
| 845 | BUG_ON(err); |
| 846 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
| 847 | BUG_ON(err); |
Kay Sievers | f30c53a | 2007-01-15 20:22:02 +0100 | [diff] [blame] | 848 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 849 | kobject_put(&mk->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | /* |
Jean Delvare | b634d13 | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 853 | * param_sysfs_builtin - add sysfs parameters for built-in modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | * |
| 855 | * Add module_parameters to sysfs for "modules" built into the kernel. |
| 856 | * |
| 857 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
| 858 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
| 859 | * extract the "module" name for all built-in kernel_param-eters, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 860 | * and for all who have the same, call kernel_add_sysfs_param. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | */ |
| 862 | static void __init param_sysfs_builtin(void) |
| 863 | { |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 864 | const struct kernel_param *kp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 865 | unsigned int name_len; |
| 866 | char modname[MODULE_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 868 | for (kp = __start___param; kp < __stop___param; kp++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | char *dot; |
| 870 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 871 | if (kp->perm == 0) |
| 872 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Rusty Russell | 730b69d | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 874 | dot = strchr(kp->name, '.'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | if (!dot) { |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 876 | /* This happens for core_param() */ |
| 877 | strcpy(modname, "kernel"); |
| 878 | name_len = 0; |
| 879 | } else { |
| 880 | name_len = dot - kp->name + 1; |
| 881 | strlcpy(modname, kp->name, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 883 | kernel_add_sysfs_param(modname, kp, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } |
| 886 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 887 | ssize_t __modver_version_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 888 | struct module_kobject *mk, char *buf) |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 889 | { |
| 890 | struct module_version_attribute *vattr = |
| 891 | container_of(mattr, struct module_version_attribute, mattr); |
| 892 | |
Chen Gang | f4940ab7 | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 893 | return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 894 | } |
| 895 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 896 | extern const struct module_version_attribute *__start___modver[]; |
| 897 | extern const struct module_version_attribute *__stop___modver[]; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 898 | |
| 899 | static void __init version_sysfs_builtin(void) |
| 900 | { |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 901 | const struct module_version_attribute **p; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 902 | struct module_kobject *mk; |
| 903 | int err; |
| 904 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 905 | for (p = __start___modver; p < __stop___modver; p++) { |
| 906 | const struct module_version_attribute *vattr = *p; |
| 907 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 908 | mk = locate_module_kobject(vattr->module_name); |
| 909 | if (mk) { |
| 910 | err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); |
Rusty Russell | 74c3dea3 | 2015-06-17 06:16:52 +0930 | [diff] [blame] | 911 | WARN_ON_ONCE(err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 912 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
| 913 | kobject_put(&mk->kobj); |
| 914 | } |
| 915 | } |
| 916 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
| 918 | /* module-related sysfs stuff */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | static ssize_t module_attr_show(struct kobject *kobj, |
| 921 | struct attribute *attr, |
| 922 | char *buf) |
| 923 | { |
| 924 | struct module_attribute *attribute; |
| 925 | struct module_kobject *mk; |
| 926 | int ret; |
| 927 | |
| 928 | attribute = to_module_attr(attr); |
| 929 | mk = to_module_kobject(kobj); |
| 930 | |
| 931 | if (!attribute->show) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 932 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 934 | ret = attribute->show(attribute, mk, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | return ret; |
| 937 | } |
| 938 | |
| 939 | static ssize_t module_attr_store(struct kobject *kobj, |
| 940 | struct attribute *attr, |
| 941 | const char *buf, size_t len) |
| 942 | { |
| 943 | struct module_attribute *attribute; |
| 944 | struct module_kobject *mk; |
| 945 | int ret; |
| 946 | |
| 947 | attribute = to_module_attr(attr); |
| 948 | mk = to_module_kobject(kobj); |
| 949 | |
| 950 | if (!attribute->store) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 951 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 953 | ret = attribute->store(attribute, mk, buf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | return ret; |
| 956 | } |
| 957 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 958 | static const struct sysfs_ops module_sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | .show = module_attr_show, |
| 960 | .store = module_attr_store, |
| 961 | }; |
| 962 | |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 963 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 964 | { |
| 965 | struct kobj_type *ktype = get_ktype(kobj); |
| 966 | |
| 967 | if (ktype == &module_ktype) |
| 968 | return 1; |
| 969 | return 0; |
| 970 | } |
| 971 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 972 | static const struct kset_uevent_ops module_uevent_ops = { |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 973 | .filter = uevent_filter, |
| 974 | }; |
| 975 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 976 | struct kset *module_kset; |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 977 | int module_sysfs_initialized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 979 | static void module_kobj_release(struct kobject *kobj) |
| 980 | { |
| 981 | struct module_kobject *mk = to_module_kobject(kobj); |
| 982 | complete(mk->kobj_completion); |
| 983 | } |
| 984 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 985 | struct kobj_type module_ktype = { |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 986 | .release = module_kobj_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | .sysfs_ops = &module_sysfs_ops, |
| 988 | }; |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | /* |
| 991 | * param_sysfs_init - wrapper for built-in params support |
| 992 | */ |
| 993 | static int __init param_sysfs_init(void) |
| 994 | { |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 995 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
| 996 | if (!module_kset) { |
| 997 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
| 998 | __FILE__, __LINE__); |
| 999 | return -ENOMEM; |
Randy Dunlap | d8c7649 | 2006-09-29 01:58:55 -0700 | [diff] [blame] | 1000 | } |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 1001 | module_sysfs_initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 1003 | version_sysfs_builtin(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | param_sysfs_builtin(); |
| 1005 | |
| 1006 | return 0; |
| 1007 | } |
Mark Huang | d10be6d | 2006-09-29 01:59:34 -0700 | [diff] [blame] | 1008 | subsys_initcall(param_sysfs_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 1010 | #endif /* CONFIG_SYSFS */ |