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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | b51d23e4 | 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 | 7a486d37 | 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, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 127 | void *arg, |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 128 | int (*handle_unknown)(char *param, char *val, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 129 | const char *doing, void *arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | { |
| 131 | unsigned int i; |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 132 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | /* Find parameter */ |
| 135 | for (i = 0; i < num_params; i++) { |
| 136 | if (parameq(param, params[i].name)) { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 137 | if (params[i].level < min_level |
| 138 | || params[i].level > max_level) |
| 139 | return 0; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 140 | /* No one handled NULL, so do it here. */ |
Steven Rostedt | ab013c5 | 2013-08-20 15:33:19 +0930 | [diff] [blame] | 141 | if (!val && |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 142 | !(params[i].ops->flags & KERNEL_PARAM_OPS_FL_NOARG)) |
Rusty Russell | 2e9fb99 | 2010-08-11 23:04:10 -0600 | [diff] [blame] | 143 | return -EINVAL; |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 144 | pr_debug("handling %s with %p\n", param, |
| 145 | params[i].ops->set); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 146 | kernel_param_lock(params[i].mod); |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 147 | param_check_unsafe(¶ms[i]); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 148 | err = params[i].ops->set(val, ¶ms[i]); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 149 | kernel_param_unlock(params[i].mod); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 150 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | } |
| 153 | |
| 154 | if (handle_unknown) { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 155 | pr_debug("doing %s: %s='%s'\n", doing, param, val); |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 156 | return handle_unknown(param, val, doing, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 159 | pr_debug("Unknown argument '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | return -ENOENT; |
| 161 | } |
| 162 | |
| 163 | /* You can use " around spaces, but can't escape ". */ |
| 164 | /* Hyphens and underscores equivalent in parameter names. */ |
| 165 | static char *next_arg(char *args, char **param, char **val) |
| 166 | { |
| 167 | unsigned int i, equals = 0; |
| 168 | int in_quote = 0, quoted = 0; |
| 169 | char *next; |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | if (*args == '"') { |
| 172 | args++; |
| 173 | in_quote = 1; |
| 174 | quoted = 1; |
| 175 | } |
| 176 | |
| 177 | for (i = 0; args[i]; i++) { |
Peter Oberparleiter | 26d052b | 2009-07-06 17:11:22 +0200 | [diff] [blame] | 178 | if (isspace(args[i]) && !in_quote) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | break; |
| 180 | if (equals == 0) { |
| 181 | if (args[i] == '=') |
| 182 | equals = i; |
| 183 | } |
| 184 | if (args[i] == '"') |
| 185 | in_quote = !in_quote; |
| 186 | } |
| 187 | |
| 188 | *param = args; |
| 189 | if (!equals) |
| 190 | *val = NULL; |
| 191 | else { |
| 192 | args[equals] = '\0'; |
| 193 | *val = args + equals + 1; |
| 194 | |
| 195 | /* Don't include quotes in value. */ |
| 196 | if (**val == '"') { |
| 197 | (*val)++; |
| 198 | if (args[i-1] == '"') |
| 199 | args[i-1] = '\0'; |
| 200 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
Rusty Russell | b9cc448 | 2015-04-15 13:23:48 +0930 | [diff] [blame] | 202 | if (quoted && args[i-1] == '"') |
| 203 | args[i-1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | if (args[i]) { |
| 206 | args[i] = '\0'; |
| 207 | next = args + i + 1; |
| 208 | } else |
| 209 | next = args + i; |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 210 | |
| 211 | /* Chew up trailing spaces. */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 212 | return skip_spaces(next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 216 | char *parse_args(const char *doing, |
| 217 | char *args, |
| 218 | const struct kernel_param *params, |
| 219 | unsigned num, |
| 220 | s16 min_level, |
| 221 | s16 max_level, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 222 | void *arg, |
| 223 | int (*unknown)(char *param, char *val, |
| 224 | const char *doing, void *arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | { |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 226 | char *param, *val, *err = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 228 | /* Chew leading spaces */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 229 | args = skip_spaces(args); |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 230 | |
Jim Cromie | 1ef9eaf | 2012-05-03 11:57:37 -0600 | [diff] [blame] | 231 | if (*args) |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 232 | pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); |
| 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | while (*args) { |
| 235 | int ret; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 236 | int irq_was_disabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | args = next_arg(args, ¶m, &val); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 239 | /* Stop at -- */ |
| 240 | if (!val && strcmp(param, "--") == 0) |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 241 | return err ?: args; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 242 | irq_was_disabled = irqs_disabled(); |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 243 | ret = parse_one(param, val, doing, params, num, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 244 | min_level, max_level, arg, unknown); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 245 | if (irq_was_disabled && !irqs_disabled()) |
| 246 | pr_warn("%s: option '%s' enabled irq's!\n", |
| 247 | doing, param); |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | switch (ret) { |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 250 | case 0: |
| 251 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | case -ENOENT: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 253 | pr_err("%s: Unknown parameter `%s'\n", doing, param); |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 254 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | case -ENOSPC: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 256 | pr_err("%s: `%s' too large for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 257 | doing, val ?: "", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | break; |
| 259 | default: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 260 | pr_err("%s: `%s' invalid for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 261 | doing, val ?: "", param); |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 262 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 264 | |
| 265 | err = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 268 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | /* Lazy bastard, eh? */ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 272 | #define STANDARD_PARAM_DEF(name, type, format, strtolfn) \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 273 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | { \ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 275 | return strtolfn(val, 0, (type *)kp->arg); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 277 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { \ |
Chen Gang | f4940ab | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 279 | return scnprintf(buffer, PAGE_SIZE, format, \ |
| 280 | *((type *)kp->arg)); \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 281 | } \ |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 282 | const struct kernel_param_ops param_ops_##name = { \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 283 | .set = param_set_##name, \ |
| 284 | .get = param_get_##name, \ |
| 285 | }; \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 286 | EXPORT_SYMBOL(param_set_##name); \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 287 | EXPORT_SYMBOL(param_get_##name); \ |
| 288 | EXPORT_SYMBOL(param_ops_##name) |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 291 | STANDARD_PARAM_DEF(byte, unsigned char, "%hhu", kstrtou8); |
| 292 | STANDARD_PARAM_DEF(short, short, "%hi", kstrtos16); |
| 293 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", kstrtou16); |
| 294 | STANDARD_PARAM_DEF(int, int, "%i", kstrtoint); |
| 295 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", kstrtouint); |
| 296 | STANDARD_PARAM_DEF(long, long, "%li", kstrtol); |
| 297 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", kstrtoul); |
Hannes Reinecke | b4210b8 | 2014-06-25 15:27:37 +0200 | [diff] [blame] | 298 | STANDARD_PARAM_DEF(ullong, unsigned long long, "%llu", kstrtoull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 300 | int param_set_charp(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | if (strlen(val) > 1024) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 303 | pr_err("%s: string parameter too long\n", kp->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | return -ENOSPC; |
| 305 | } |
| 306 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 307 | maybe_kfree_parameter(*(char **)kp->arg); |
| 308 | |
| 309 | /* 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] | 310 | * don't need to; this mangled commandline is preserved. */ |
| 311 | if (slab_is_available()) { |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 312 | *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
Rusty Russell | d553ad8 | 2009-10-29 08:56:17 -0600 | [diff] [blame] | 313 | if (!*(char **)kp->arg) |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 314 | return -ENOMEM; |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 315 | strcpy(*(char **)kp->arg, val); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 316 | } else |
| 317 | *(const char **)kp->arg = val; |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | return 0; |
| 320 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 321 | EXPORT_SYMBOL(param_set_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 323 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | { |
Chen Gang | f4940ab | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 325 | return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 327 | EXPORT_SYMBOL(param_get_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Dan Streetman | 3d9c637 | 2015-11-06 16:29:12 -0800 | [diff] [blame] | 329 | void param_free_charp(void *arg) |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 330 | { |
| 331 | maybe_kfree_parameter(*((char **)arg)); |
| 332 | } |
Dan Streetman | 3d9c637 | 2015-11-06 16:29:12 -0800 | [diff] [blame] | 333 | EXPORT_SYMBOL(param_free_charp); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 334 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 335 | const struct kernel_param_ops param_ops_charp = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 336 | .set = param_set_charp, |
| 337 | .get = param_get_charp, |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 338 | .free = param_free_charp, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 339 | }; |
| 340 | EXPORT_SYMBOL(param_ops_charp); |
| 341 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 342 | /* Actually could be a bool or an int, for historical reasons. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 343 | int param_set_bool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
| 345 | /* No equals means "set"... */ |
| 346 | if (!val) val = "1"; |
| 347 | |
| 348 | /* One of =[yYnN01] */ |
Rusty Russell | 8b825281 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 349 | return strtobool(val, kp->arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 351 | EXPORT_SYMBOL(param_set_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 353 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | /* Y and N chosen as being relatively non-coder friendly */ |
Rusty Russell | 8b825281 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 356 | return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 358 | EXPORT_SYMBOL(param_get_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 360 | const struct kernel_param_ops param_ops_bool = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 361 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 362 | .set = param_set_bool, |
| 363 | .get = param_get_bool, |
| 364 | }; |
| 365 | EXPORT_SYMBOL(param_ops_bool); |
| 366 | |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 367 | int param_set_bool_enable_only(const char *val, const struct kernel_param *kp) |
| 368 | { |
| 369 | int err = 0; |
| 370 | bool new_value; |
| 371 | bool orig_value = *(bool *)kp->arg; |
| 372 | struct kernel_param dummy_kp = *kp; |
| 373 | |
| 374 | dummy_kp.arg = &new_value; |
| 375 | |
| 376 | err = param_set_bool(val, &dummy_kp); |
| 377 | if (err) |
| 378 | return err; |
| 379 | |
| 380 | /* Don't let them unset it once it's set! */ |
| 381 | if (!new_value && orig_value) |
| 382 | return -EROFS; |
| 383 | |
| 384 | if (new_value) |
| 385 | err = param_set_bool(val, kp); |
| 386 | |
| 387 | return err; |
| 388 | } |
| 389 | EXPORT_SYMBOL_GPL(param_set_bool_enable_only); |
| 390 | |
| 391 | const struct kernel_param_ops param_ops_bool_enable_only = { |
| 392 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
| 393 | .set = param_set_bool_enable_only, |
| 394 | .get = param_get_bool, |
| 395 | }; |
Luis R. Rodriguez | 154be21 | 2015-05-27 11:09:39 +0930 | [diff] [blame] | 396 | EXPORT_SYMBOL_GPL(param_ops_bool_enable_only); |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 397 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 398 | /* This one must be bool. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 399 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | { |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 401 | int ret; |
| 402 | bool boolval; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 403 | struct kernel_param dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 405 | dummy.arg = &boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | ret = param_set_bool(val, &dummy); |
| 407 | if (ret == 0) |
Rusty Russell | 9a71af2 | 2009-06-12 21:46:53 -0600 | [diff] [blame] | 408 | *(bool *)kp->arg = !boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | return ret; |
| 410 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 411 | EXPORT_SYMBOL(param_set_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 413 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | { |
Rusty Russell | 9a71af2 | 2009-06-12 21:46:53 -0600 | [diff] [blame] | 415 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 417 | EXPORT_SYMBOL(param_get_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 419 | const struct kernel_param_ops param_ops_invbool = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 420 | .set = param_set_invbool, |
| 421 | .get = param_get_invbool, |
| 422 | }; |
| 423 | EXPORT_SYMBOL(param_ops_invbool); |
| 424 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 425 | int param_set_bint(const char *val, const struct kernel_param *kp) |
| 426 | { |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 427 | /* Match bool exactly, by re-using it. */ |
| 428 | struct kernel_param boolkp = *kp; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 429 | bool v; |
| 430 | int ret; |
| 431 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 432 | boolkp.arg = &v; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 433 | |
| 434 | ret = param_set_bool(val, &boolkp); |
| 435 | if (ret == 0) |
| 436 | *(int *)kp->arg = v; |
| 437 | return ret; |
| 438 | } |
| 439 | EXPORT_SYMBOL(param_set_bint); |
| 440 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 441 | const struct kernel_param_ops param_ops_bint = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 442 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 443 | .set = param_set_bint, |
| 444 | .get = param_get_int, |
| 445 | }; |
| 446 | EXPORT_SYMBOL(param_ops_bint); |
| 447 | |
Bert Wesarg | 9730b5b | 2007-05-08 00:28:50 -0700 | [diff] [blame] | 448 | /* We break the rule and mangle the string. */ |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 449 | static int param_array(struct module *mod, |
| 450 | const char *name, |
Adrian Bunk | 9871728 | 2006-03-25 03:07:06 -0800 | [diff] [blame] | 451 | const char *val, |
| 452 | unsigned int min, unsigned int max, |
| 453 | void *elem, int elemsize, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 454 | int (*set)(const char *, const struct kernel_param *kp), |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 455 | s16 level, |
Richard Knutsson | eb38a99 | 2008-02-06 01:37:50 -0800 | [diff] [blame] | 456 | unsigned int *num) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
| 458 | int ret; |
| 459 | struct kernel_param kp; |
| 460 | char save; |
| 461 | |
| 462 | /* Get the name right for errors. */ |
| 463 | kp.name = name; |
| 464 | kp.arg = elem; |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 465 | kp.level = level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | *num = 0; |
| 468 | /* We expect a comma-separated list of values. */ |
| 469 | do { |
| 470 | int len; |
| 471 | |
| 472 | if (*num == max) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 473 | pr_err("%s: can only take %i arguments\n", name, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return -EINVAL; |
| 475 | } |
| 476 | len = strcspn(val, ","); |
| 477 | |
| 478 | /* nul-terminate and parse */ |
| 479 | save = val[len]; |
| 480 | ((char *)val)[len] = '\0'; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 481 | check_kparam_locked(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | ret = set(val, &kp); |
| 483 | |
| 484 | if (ret != 0) |
| 485 | return ret; |
| 486 | kp.arg += elemsize; |
| 487 | val += len+1; |
| 488 | (*num)++; |
| 489 | } while (save == ','); |
| 490 | |
| 491 | if (*num < min) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 492 | pr_err("%s: needs at least %i arguments\n", name, min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | return -EINVAL; |
| 494 | } |
| 495 | return 0; |
| 496 | } |
| 497 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 498 | 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] | 499 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 500 | const struct kparam_array *arr = kp->arr; |
Bert Wesarg | 31143a1 | 2005-04-16 15:25:42 -0700 | [diff] [blame] | 501 | unsigned int temp_num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 503 | 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] | 504 | arr->elemsize, arr->ops->set, kp->level, |
Rusty Russell | 3c7d76e | 2009-10-29 08:56:19 -0600 | [diff] [blame] | 505 | arr->num ?: &temp_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 508 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | int i, off, ret; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 511 | const struct kparam_array *arr = kp->arr; |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 512 | struct kernel_param p = *kp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
| 515 | if (i) |
| 516 | buffer[off++] = ','; |
| 517 | p.arg = arr->elem + arr->elemsize * i; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 518 | check_kparam_locked(p.mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 519 | ret = arr->ops->get(buffer + off, &p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (ret < 0) |
| 521 | return ret; |
| 522 | off += ret; |
| 523 | } |
| 524 | buffer[off] = '\0'; |
| 525 | return off; |
| 526 | } |
| 527 | |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 528 | static void param_array_free(void *arg) |
| 529 | { |
| 530 | unsigned int i; |
| 531 | const struct kparam_array *arr = arg; |
| 532 | |
| 533 | if (arr->ops->free) |
| 534 | for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) |
| 535 | arr->ops->free(arr->elem + arr->elemsize * i); |
| 536 | } |
| 537 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 538 | const struct kernel_param_ops param_array_ops = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 539 | .set = param_array_set, |
| 540 | .get = param_array_get, |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 541 | .free = param_array_free, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 542 | }; |
| 543 | EXPORT_SYMBOL(param_array_ops); |
| 544 | |
| 545 | int param_set_copystring(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 547 | const struct kparam_string *kps = kp->str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | if (strlen(val)+1 > kps->maxlen) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 550 | pr_err("%s: string doesn't fit in %u chars.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | kp->name, kps->maxlen-1); |
| 552 | return -ENOSPC; |
| 553 | } |
| 554 | strcpy(kps->string, val); |
| 555 | return 0; |
| 556 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 557 | EXPORT_SYMBOL(param_set_copystring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 559 | int param_get_string(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 561 | const struct kparam_string *kps = kp->str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | return strlcpy(buffer, kps->string, kps->maxlen); |
| 563 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 564 | EXPORT_SYMBOL(param_get_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 566 | const struct kernel_param_ops param_ops_string = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 567 | .set = param_set_copystring, |
| 568 | .get = param_get_string, |
| 569 | }; |
| 570 | EXPORT_SYMBOL(param_ops_string); |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 573 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
| 574 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | struct param_attribute |
| 577 | { |
| 578 | struct module_attribute mattr; |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 579 | const struct kernel_param *param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | }; |
| 581 | |
| 582 | struct module_param_attrs |
| 583 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 584 | unsigned int num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | struct attribute_group grp; |
| 586 | struct param_attribute attrs[0]; |
| 587 | }; |
| 588 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 589 | #ifdef CONFIG_SYSFS |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 590 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
| 592 | static ssize_t param_attr_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 593 | struct module_kobject *mk, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | { |
| 595 | int count; |
| 596 | struct param_attribute *attribute = to_param_attr(mattr); |
| 597 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 598 | if (!attribute->param->ops->get) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | return -EPERM; |
| 600 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 601 | kernel_param_lock(mk->mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 602 | count = attribute->param->ops->get(buf, attribute->param); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 603 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | if (count > 0) { |
| 605 | strcat(buf, "\n"); |
| 606 | ++count; |
| 607 | } |
| 608 | return count; |
| 609 | } |
| 610 | |
| 611 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
| 612 | static ssize_t param_attr_store(struct module_attribute *mattr, |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 613 | struct module_kobject *mk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | const char *buf, size_t len) |
| 615 | { |
| 616 | int err; |
| 617 | struct param_attribute *attribute = to_param_attr(mattr); |
| 618 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 619 | if (!attribute->param->ops->set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | return -EPERM; |
| 621 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 622 | kernel_param_lock(mk->mod); |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 623 | param_check_unsafe(attribute->param); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 624 | err = attribute->param->ops->set(buf, attribute->param); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 625 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (!err) |
| 627 | return len; |
| 628 | return err; |
| 629 | } |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 630 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | #ifdef CONFIG_MODULES |
| 633 | #define __modinit |
| 634 | #else |
| 635 | #define __modinit __init |
| 636 | #endif |
| 637 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 638 | #ifdef CONFIG_SYSFS |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 639 | void kernel_param_lock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 640 | { |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 641 | mutex_lock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 642 | } |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 643 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 644 | void kernel_param_unlock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 645 | { |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 646 | mutex_unlock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 647 | } |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 648 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 649 | EXPORT_SYMBOL(kernel_param_lock); |
| 650 | EXPORT_SYMBOL(kernel_param_unlock); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 651 | |
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 | * add_sysfs_param - add a parameter to sysfs |
| 654 | * @mk: struct module_kobject |
| 655 | * @kparam: the actual parameter definition to add to sysfs |
| 656 | * @name: name of parameter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 658 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
| 659 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
| 660 | * if there's an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 662 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 663 | const struct kernel_param *kp, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 664 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 666 | struct module_param_attrs *new_mp; |
| 667 | struct attribute **new_attrs; |
| 668 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 670 | /* We don't bother calling this with invisible parameters. */ |
| 671 | BUG_ON(!kp->perm); |
| 672 | |
| 673 | if (!mk->mp) { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 674 | /* First allocation. */ |
| 675 | mk->mp = kzalloc(sizeof(*mk->mp), GFP_KERNEL); |
| 676 | if (!mk->mp) |
| 677 | return -ENOMEM; |
| 678 | mk->mp->grp.name = "parameters"; |
| 679 | /* NULL-terminated attribute array. */ |
| 680 | mk->mp->grp.attrs = kzalloc(sizeof(mk->mp->grp.attrs[0]), |
| 681 | GFP_KERNEL); |
| 682 | /* Caller will cleanup via free_module_param_attrs */ |
| 683 | if (!mk->mp->grp.attrs) |
| 684 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 687 | /* Enlarge allocations. */ |
| 688 | new_mp = krealloc(mk->mp, |
| 689 | sizeof(*mk->mp) + |
| 690 | sizeof(mk->mp->attrs[0]) * (mk->mp->num + 1), |
| 691 | GFP_KERNEL); |
| 692 | if (!new_mp) |
| 693 | return -ENOMEM; |
| 694 | mk->mp = new_mp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 695 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 696 | /* Extra pointer for NULL terminator */ |
| 697 | new_attrs = krealloc(mk->mp->grp.attrs, |
| 698 | sizeof(mk->mp->grp.attrs[0]) * (mk->mp->num + 2), |
| 699 | GFP_KERNEL); |
| 700 | if (!new_attrs) |
| 701 | return -ENOMEM; |
| 702 | mk->mp->grp.attrs = new_attrs; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 703 | |
| 704 | /* Tack new one on the end. */ |
Rusty Russell | c772be5 | 2015-01-20 09:07:04 +1030 | [diff] [blame] | 705 | 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] | 706 | sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr); |
| 707 | mk->mp->attrs[mk->mp->num].param = kp; |
| 708 | mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show; |
Kees Cook | b0a65b0 | 2014-12-12 13:36:49 +1030 | [diff] [blame] | 709 | /* Do not allow runtime DAC changes to make param writable. */ |
| 710 | if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0) |
| 711 | mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; |
Rusty Russell | 574732c | 2014-12-23 15:05:36 +1030 | [diff] [blame] | 712 | else |
| 713 | mk->mp->attrs[mk->mp->num].mattr.store = NULL; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 714 | mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name; |
| 715 | mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm; |
| 716 | mk->mp->num++; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 717 | |
| 718 | /* Fix up all the pointers, since krealloc can move us */ |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 719 | for (i = 0; i < mk->mp->num; i++) |
| 720 | mk->mp->grp.attrs[i] = &mk->mp->attrs[i].mattr.attr; |
| 721 | mk->mp->grp.attrs[mk->mp->num] = NULL; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 722 | return 0; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 723 | } |
| 724 | |
Linus Torvalds | d244118 | 2008-10-23 12:07:17 -0700 | [diff] [blame] | 725 | #ifdef CONFIG_MODULES |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 726 | static void free_module_param_attrs(struct module_kobject *mk) |
| 727 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 728 | if (mk->mp) |
| 729 | kfree(mk->mp->grp.attrs); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 730 | kfree(mk->mp); |
| 731 | mk->mp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | /* |
| 735 | * module_param_sysfs_setup - setup sysfs support for one module |
| 736 | * @mod: module |
| 737 | * @kparam: module parameters (array) |
| 738 | * @num_params: number of module parameters |
| 739 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 740 | * Adds sysfs entries for module parameters under |
| 741 | * /sys/module/[mod->name]/parameters/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | */ |
| 743 | int module_param_sysfs_setup(struct module *mod, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 744 | const struct kernel_param *kparam, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | unsigned int num_params) |
| 746 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 747 | int i, err; |
| 748 | bool params = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 750 | for (i = 0; i < num_params; i++) { |
| 751 | if (kparam[i].perm == 0) |
| 752 | continue; |
| 753 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 754 | if (err) { |
| 755 | free_module_param_attrs(&mod->mkobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 756 | return err; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 757 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 758 | params = true; |
| 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 761 | if (!params) |
| 762 | return 0; |
| 763 | |
| 764 | /* Create the param group. */ |
| 765 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
| 766 | if (err) |
| 767 | free_module_param_attrs(&mod->mkobj); |
| 768 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | /* |
| 772 | * module_param_sysfs_remove - remove sysfs support for one module |
| 773 | * @mod: module |
| 774 | * |
| 775 | * Remove sysfs entries for module parameters and the corresponding |
| 776 | * kobject. |
| 777 | */ |
| 778 | void module_param_sysfs_remove(struct module *mod) |
| 779 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 780 | if (mod->mkobj.mp) { |
| 781 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | /* We are positive that no one is using any param |
| 783 | * attrs at this point. Deallocate immediately. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 784 | free_module_param_attrs(&mod->mkobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | } |
| 787 | #endif |
| 788 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 789 | void destroy_params(const struct kernel_param *params, unsigned num) |
| 790 | { |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 791 | unsigned int i; |
| 792 | |
| 793 | for (i = 0; i < num; i++) |
| 794 | if (params[i].ops->free) |
| 795 | params[i].ops->free(params[i].arg); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 796 | } |
| 797 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 798 | static struct module_kobject * __init locate_module_kobject(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
| 800 | struct module_kobject *mk; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 801 | struct kobject *kobj; |
| 802 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 804 | kobj = kset_find_obj(module_kset, name); |
| 805 | if (kobj) { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 806 | mk = to_module_kobject(kobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 807 | } else { |
| 808 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
| 809 | BUG_ON(!mk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 811 | mk->mod = THIS_MODULE; |
| 812 | mk->kobj.kset = module_kset; |
| 813 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
| 814 | "%s", name); |
Kay Sievers | 88bfa32 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 815 | #ifdef CONFIG_MODULES |
| 816 | if (!err) |
| 817 | err = sysfs_create_file(&mk->kobj, &module_uevent.attr); |
| 818 | #endif |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 819 | if (err) { |
| 820 | kobject_put(&mk->kobj); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 821 | 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] | 822 | name, err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 823 | return NULL; |
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 | |
| 826 | /* So that we hold reference in both cases. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 827 | kobject_get(&mk->kobj); |
Greg Kroah-Hartman | 74c5b59 | 2007-07-30 11:26:38 -0700 | [diff] [blame] | 828 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 829 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 830 | return mk; |
| 831 | } |
| 832 | |
| 833 | static void __init kernel_add_sysfs_param(const char *name, |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 834 | const struct kernel_param *kparam, |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 835 | unsigned int name_skip) |
| 836 | { |
| 837 | struct module_kobject *mk; |
| 838 | int err; |
| 839 | |
| 840 | mk = locate_module_kobject(name); |
| 841 | if (!mk) |
| 842 | return; |
| 843 | |
| 844 | /* We need to remove old parameters before adding more. */ |
| 845 | if (mk->mp) |
| 846 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
| 847 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 848 | /* These should not fail at boot. */ |
| 849 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
| 850 | BUG_ON(err); |
| 851 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
| 852 | BUG_ON(err); |
Kay Sievers | f30c53a | 2007-01-15 20:22:02 +0100 | [diff] [blame] | 853 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 854 | kobject_put(&mk->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | /* |
Jean Delvare | b634d13 | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 858 | * param_sysfs_builtin - add sysfs parameters for built-in modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | * |
| 860 | * Add module_parameters to sysfs for "modules" built into the kernel. |
| 861 | * |
| 862 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
| 863 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
| 864 | * extract the "module" name for all built-in kernel_param-eters, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 865 | * and for all who have the same, call kernel_add_sysfs_param. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | */ |
| 867 | static void __init param_sysfs_builtin(void) |
| 868 | { |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 869 | const struct kernel_param *kp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 870 | unsigned int name_len; |
| 871 | char modname[MODULE_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 873 | for (kp = __start___param; kp < __stop___param; kp++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | char *dot; |
| 875 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 876 | if (kp->perm == 0) |
| 877 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
Rusty Russell | 730b69d | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 879 | dot = strchr(kp->name, '.'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | if (!dot) { |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 881 | /* This happens for core_param() */ |
| 882 | strcpy(modname, "kernel"); |
| 883 | name_len = 0; |
| 884 | } else { |
| 885 | name_len = dot - kp->name + 1; |
| 886 | strlcpy(modname, kp->name, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 888 | kernel_add_sysfs_param(modname, kp, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 892 | ssize_t __modver_version_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 893 | struct module_kobject *mk, char *buf) |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 894 | { |
| 895 | struct module_version_attribute *vattr = |
| 896 | container_of(mattr, struct module_version_attribute, mattr); |
| 897 | |
Chen Gang | f4940ab | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 898 | return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 899 | } |
| 900 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 901 | extern const struct module_version_attribute *__start___modver[]; |
| 902 | extern const struct module_version_attribute *__stop___modver[]; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 903 | |
| 904 | static void __init version_sysfs_builtin(void) |
| 905 | { |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 906 | const struct module_version_attribute **p; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 907 | struct module_kobject *mk; |
| 908 | int err; |
| 909 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 910 | for (p = __start___modver; p < __stop___modver; p++) { |
| 911 | const struct module_version_attribute *vattr = *p; |
| 912 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 913 | mk = locate_module_kobject(vattr->module_name); |
| 914 | if (mk) { |
| 915 | err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); |
Rusty Russell | 74c3dea3 | 2015-06-17 06:16:52 +0930 | [diff] [blame] | 916 | WARN_ON_ONCE(err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 917 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
| 918 | kobject_put(&mk->kobj); |
| 919 | } |
| 920 | } |
| 921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | |
| 923 | /* module-related sysfs stuff */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | static ssize_t module_attr_show(struct kobject *kobj, |
| 926 | struct attribute *attr, |
| 927 | char *buf) |
| 928 | { |
| 929 | struct module_attribute *attribute; |
| 930 | struct module_kobject *mk; |
| 931 | int ret; |
| 932 | |
| 933 | attribute = to_module_attr(attr); |
| 934 | mk = to_module_kobject(kobj); |
| 935 | |
| 936 | if (!attribute->show) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 937 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 939 | ret = attribute->show(attribute, mk, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | return ret; |
| 942 | } |
| 943 | |
| 944 | static ssize_t module_attr_store(struct kobject *kobj, |
| 945 | struct attribute *attr, |
| 946 | const char *buf, size_t len) |
| 947 | { |
| 948 | struct module_attribute *attribute; |
| 949 | struct module_kobject *mk; |
| 950 | int ret; |
| 951 | |
| 952 | attribute = to_module_attr(attr); |
| 953 | mk = to_module_kobject(kobj); |
| 954 | |
| 955 | if (!attribute->store) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 956 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 958 | ret = attribute->store(attribute, mk, buf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | return ret; |
| 961 | } |
| 962 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 963 | static const struct sysfs_ops module_sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | .show = module_attr_show, |
| 965 | .store = module_attr_store, |
| 966 | }; |
| 967 | |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 968 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 969 | { |
| 970 | struct kobj_type *ktype = get_ktype(kobj); |
| 971 | |
| 972 | if (ktype == &module_ktype) |
| 973 | return 1; |
| 974 | return 0; |
| 975 | } |
| 976 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 977 | static const struct kset_uevent_ops module_uevent_ops = { |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 978 | .filter = uevent_filter, |
| 979 | }; |
| 980 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 981 | struct kset *module_kset; |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 982 | int module_sysfs_initialized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 984 | static void module_kobj_release(struct kobject *kobj) |
| 985 | { |
| 986 | struct module_kobject *mk = to_module_kobject(kobj); |
| 987 | complete(mk->kobj_completion); |
| 988 | } |
| 989 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 990 | struct kobj_type module_ktype = { |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 991 | .release = module_kobj_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | .sysfs_ops = &module_sysfs_ops, |
| 993 | }; |
| 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | /* |
| 996 | * param_sysfs_init - wrapper for built-in params support |
| 997 | */ |
| 998 | static int __init param_sysfs_init(void) |
| 999 | { |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 1000 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
| 1001 | if (!module_kset) { |
| 1002 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
| 1003 | __FILE__, __LINE__); |
| 1004 | return -ENOMEM; |
Randy Dunlap | d8c7649 | 2006-09-29 01:58:55 -0700 | [diff] [blame] | 1005 | } |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 1006 | module_sysfs_initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 1008 | version_sysfs_builtin(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | param_sysfs_builtin(); |
| 1010 | |
| 1011 | return 0; |
| 1012 | } |
Mark Huang | d10be6d | 2006-09-29 01:59:34 -0700 | [diff] [blame] | 1013 | subsys_initcall(param_sysfs_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 1015 | #endif /* CONFIG_SYSFS */ |