Thomas Gleixner | 1a59d1b8 | 2019-05-27 08:55:05 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* Helpers for initial module or kernel cmdline parsing |
| 3 | Copyright (C) 2001 Rusty Russell. |
| 4 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/kernel.h> |
| 7 | #include <linux/string.h> |
| 8 | #include <linux/errno.h> |
| 9 | #include <linux/module.h> |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 10 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/device.h> |
| 12 | #include <linux/err.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 13 | #include <linux/slab.h> |
Peter Oberparleiter | 26d052b | 2009-07-06 17:11:22 +0200 | [diff] [blame] | 14 | #include <linux/ctype.h> |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 15 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 17 | #ifdef CONFIG_SYSFS |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 18 | /* Protects all built-in parameters, modules use their own param_lock */ |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 19 | static DEFINE_MUTEX(param_lock); |
| 20 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 21 | /* 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] | 22 | #ifdef CONFIG_MODULES |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 23 | #define KPARAM_MUTEX(mod) ((mod) ? &(mod)->param_lock : ¶m_lock) |
Stephen Rothwell | 20bdc2c | 2015-06-26 13:19:19 +1000 | [diff] [blame] | 24 | #else |
| 25 | #define KPARAM_MUTEX(mod) (¶m_lock) |
| 26 | #endif |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 27 | |
| 28 | static inline void check_kparam_locked(struct module *mod) |
| 29 | { |
| 30 | BUG_ON(!mutex_is_locked(KPARAM_MUTEX(mod))); |
| 31 | } |
| 32 | #else |
| 33 | static inline void check_kparam_locked(struct module *mod) |
| 34 | { |
| 35 | } |
| 36 | #endif /* !CONFIG_SYSFS */ |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 37 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 38 | /* This just allows us to keep track of which parameters are kmalloced. */ |
| 39 | struct kmalloced_param { |
| 40 | struct list_head list; |
| 41 | char val[]; |
| 42 | }; |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 43 | static LIST_HEAD(kmalloced_params); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 44 | static DEFINE_SPINLOCK(kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 45 | |
| 46 | static void *kmalloc_parameter(unsigned int size) |
| 47 | { |
| 48 | struct kmalloced_param *p; |
| 49 | |
| 50 | p = kmalloc(sizeof(*p) + size, GFP_KERNEL); |
| 51 | if (!p) |
| 52 | return NULL; |
| 53 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 54 | spin_lock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 55 | list_add(&p->list, &kmalloced_params); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 56 | spin_unlock(&kmalloced_params_lock); |
| 57 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 58 | return p->val; |
| 59 | } |
| 60 | |
| 61 | /* Does nothing if parameter wasn't kmalloced above. */ |
| 62 | static void maybe_kfree_parameter(void *param) |
| 63 | { |
| 64 | struct kmalloced_param *p; |
| 65 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 66 | spin_lock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 67 | list_for_each_entry(p, &kmalloced_params, list) { |
| 68 | if (p->val == param) { |
| 69 | list_del(&p->list); |
| 70 | kfree(p); |
| 71 | break; |
| 72 | } |
| 73 | } |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 74 | spin_unlock(&kmalloced_params_lock); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 75 | } |
| 76 | |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 77 | static char dash2underscore(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
| 79 | if (c == '-') |
| 80 | return '_'; |
| 81 | return c; |
| 82 | } |
| 83 | |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 84 | bool parameqn(const char *a, const char *b, size_t n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 86 | size_t i; |
| 87 | |
| 88 | for (i = 0; i < n; i++) { |
| 89 | if (dash2underscore(a[i]) != dash2underscore(b[i])) |
| 90 | return false; |
| 91 | } |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | bool parameq(const char *a, const char *b) |
| 96 | { |
| 97 | return parameqn(a, b, strlen(a)+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 100 | static bool param_check_unsafe(const struct kernel_param *kp) |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 101 | { |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 102 | if (kp->flags & KERNEL_PARAM_FL_HWPARAM && |
| 103 | security_locked_down(LOCKDOWN_MODULE_PARAMETERS)) |
| 104 | return false; |
| 105 | |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 106 | if (kp->flags & KERNEL_PARAM_FL_UNSAFE) { |
Chris Wilson | edc41b3 | 2018-04-10 16:35:18 -0700 | [diff] [blame] | 107 | pr_notice("Setting dangerous option %s - tainting kernel\n", |
| 108 | kp->name); |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 109 | add_taint(TAINT_USER, LOCKDEP_STILL_OK); |
| 110 | } |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 111 | |
| 112 | return true; |
Rusty Russell | 7a486d37 | 2014-08-27 06:25:23 +0930 | [diff] [blame] | 113 | } |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | static int parse_one(char *param, |
| 116 | char *val, |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 117 | const char *doing, |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 118 | const struct kernel_param *params, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | unsigned num_params, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 120 | s16 min_level, |
| 121 | s16 max_level, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 122 | void *arg, |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 123 | int (*handle_unknown)(char *param, char *val, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 124 | const char *doing, void *arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | { |
| 126 | unsigned int i; |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 127 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | /* Find parameter */ |
| 130 | for (i = 0; i < num_params; i++) { |
| 131 | if (parameq(param, params[i].name)) { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 132 | if (params[i].level < min_level |
| 133 | || params[i].level > max_level) |
| 134 | return 0; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 135 | /* No one handled NULL, so do it here. */ |
Steven Rostedt | ab013c5 | 2013-08-20 15:33:19 +0930 | [diff] [blame] | 136 | if (!val && |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 137 | !(params[i].ops->flags & KERNEL_PARAM_OPS_FL_NOARG)) |
Rusty Russell | 2e9fb99 | 2010-08-11 23:04:10 -0600 | [diff] [blame] | 138 | return -EINVAL; |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 139 | pr_debug("handling %s with %p\n", param, |
| 140 | params[i].ops->set); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 141 | kernel_param_lock(params[i].mod); |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 142 | if (param_check_unsafe(¶ms[i])) |
| 143 | err = params[i].ops->set(val, ¶ms[i]); |
| 144 | else |
| 145 | err = -EPERM; |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 146 | kernel_param_unlock(params[i].mod); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 147 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | } |
| 150 | |
| 151 | if (handle_unknown) { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 152 | pr_debug("doing %s: %s='%s'\n", doing, param, val); |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 153 | return handle_unknown(param, val, doing, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 156 | pr_debug("Unknown argument '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return -ENOENT; |
| 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 161 | char *parse_args(const char *doing, |
| 162 | char *args, |
| 163 | const struct kernel_param *params, |
| 164 | unsigned num, |
| 165 | s16 min_level, |
| 166 | s16 max_level, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 167 | void *arg, |
| 168 | int (*unknown)(char *param, char *val, |
| 169 | const char *doing, void *arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 171 | char *param, *val, *err = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 173 | /* Chew leading spaces */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 174 | args = skip_spaces(args); |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 175 | |
Jim Cromie | 1ef9eaf | 2012-05-03 11:57:37 -0600 | [diff] [blame] | 176 | if (*args) |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 177 | pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | while (*args) { |
| 180 | int ret; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 181 | int irq_was_disabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | args = next_arg(args, ¶m, &val); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 184 | /* Stop at -- */ |
| 185 | if (!val && strcmp(param, "--") == 0) |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 186 | return err ?: args; |
Ard van Breemen | a416aba | 2007-01-05 16:36:20 -0800 | [diff] [blame] | 187 | irq_was_disabled = irqs_disabled(); |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 188 | ret = parse_one(param, val, doing, params, num, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 189 | min_level, max_level, arg, unknown); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 190 | if (irq_was_disabled && !irqs_disabled()) |
| 191 | pr_warn("%s: option '%s' enabled irq's!\n", |
| 192 | doing, param); |
| 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | switch (ret) { |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 195 | case 0: |
| 196 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | case -ENOENT: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 198 | pr_err("%s: Unknown parameter `%s'\n", doing, param); |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 199 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | case -ENOSPC: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 201 | pr_err("%s: `%s' too large for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 202 | doing, val ?: "", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | break; |
| 204 | default: |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 205 | pr_err("%s: `%s' invalid for parameter `%s'\n", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 206 | doing, val ?: "", param); |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 207 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 209 | |
| 210 | err = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Oleg Nesterov | 74b22c4 | 2015-08-26 09:42:34 +0930 | [diff] [blame] | 213 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | /* Lazy bastard, eh? */ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 217 | #define STANDARD_PARAM_DEF(name, type, format, strtolfn) \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 218 | int param_set_##name(const char *val, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { \ |
Felipe Contreras | 88a88b32 | 2013-12-04 14:09:38 +1030 | [diff] [blame] | 220 | return strtolfn(val, 0, (type *)kp->arg); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 222 | int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { \ |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 224 | return scnprintf(buffer, PAGE_SIZE, format "\n", \ |
Chen Gang | f4940ab | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 225 | *((type *)kp->arg)); \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 226 | } \ |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 227 | const struct kernel_param_ops param_ops_##name = { \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 228 | .set = param_set_##name, \ |
| 229 | .get = param_get_##name, \ |
| 230 | }; \ |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 231 | EXPORT_SYMBOL(param_set_##name); \ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 232 | EXPORT_SYMBOL(param_get_##name); \ |
| 233 | EXPORT_SYMBOL(param_ops_##name) |
| 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Jean Delvare | e0596c8 | 2017-10-03 16:16:41 -0700 | [diff] [blame] | 236 | STANDARD_PARAM_DEF(byte, unsigned char, "%hhu", kstrtou8); |
| 237 | STANDARD_PARAM_DEF(short, short, "%hi", kstrtos16); |
| 238 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", kstrtou16); |
| 239 | STANDARD_PARAM_DEF(int, int, "%i", kstrtoint); |
| 240 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", kstrtouint); |
| 241 | STANDARD_PARAM_DEF(long, long, "%li", kstrtol); |
| 242 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", kstrtoul); |
| 243 | STANDARD_PARAM_DEF(ullong, unsigned long long, "%llu", kstrtoull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 245 | int param_set_charp(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (strlen(val) > 1024) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 248 | pr_err("%s: string parameter too long\n", kp->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return -ENOSPC; |
| 250 | } |
| 251 | |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 252 | maybe_kfree_parameter(*(char **)kp->arg); |
| 253 | |
| 254 | /* 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] | 255 | * don't need to; this mangled commandline is preserved. */ |
| 256 | if (slab_is_available()) { |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 257 | *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
Rusty Russell | d553ad8 | 2009-10-29 08:56:17 -0600 | [diff] [blame] | 258 | if (!*(char **)kp->arg) |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 259 | return -ENOMEM; |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 260 | strcpy(*(char **)kp->arg, val); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 261 | } else |
| 262 | *(const char **)kp->arg = val; |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | return 0; |
| 265 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 266 | EXPORT_SYMBOL(param_set_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 268 | int param_get_charp(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 270 | return scnprintf(buffer, PAGE_SIZE, "%s\n", *((char **)kp->arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 272 | EXPORT_SYMBOL(param_get_charp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Dan Streetman | 3d9c637 | 2015-11-06 16:29:12 -0800 | [diff] [blame] | 274 | void param_free_charp(void *arg) |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 275 | { |
| 276 | maybe_kfree_parameter(*((char **)arg)); |
| 277 | } |
Dan Streetman | 3d9c637 | 2015-11-06 16:29:12 -0800 | [diff] [blame] | 278 | EXPORT_SYMBOL(param_free_charp); |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 279 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 280 | const struct kernel_param_ops param_ops_charp = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 281 | .set = param_set_charp, |
| 282 | .get = param_get_charp, |
Rusty Russell | a105432 | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 283 | .free = param_free_charp, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 284 | }; |
| 285 | EXPORT_SYMBOL(param_ops_charp); |
| 286 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 287 | /* Actually could be a bool or an int, for historical reasons. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 288 | int param_set_bool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | { |
| 290 | /* No equals means "set"... */ |
| 291 | if (!val) val = "1"; |
| 292 | |
| 293 | /* One of =[yYnN01] */ |
Rusty Russell | 8b825281 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 294 | return strtobool(val, kp->arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 296 | EXPORT_SYMBOL(param_set_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 298 | int param_get_bool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
| 300 | /* Y and N chosen as being relatively non-coder friendly */ |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 301 | return sprintf(buffer, "%c\n", *(bool *)kp->arg ? 'Y' : 'N'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 303 | EXPORT_SYMBOL(param_get_bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 305 | const struct kernel_param_ops param_ops_bool = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 306 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 307 | .set = param_set_bool, |
| 308 | .get = param_get_bool, |
| 309 | }; |
| 310 | EXPORT_SYMBOL(param_ops_bool); |
| 311 | |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 312 | int param_set_bool_enable_only(const char *val, const struct kernel_param *kp) |
| 313 | { |
| 314 | int err = 0; |
| 315 | bool new_value; |
| 316 | bool orig_value = *(bool *)kp->arg; |
| 317 | struct kernel_param dummy_kp = *kp; |
| 318 | |
| 319 | dummy_kp.arg = &new_value; |
| 320 | |
| 321 | err = param_set_bool(val, &dummy_kp); |
| 322 | if (err) |
| 323 | return err; |
| 324 | |
| 325 | /* Don't let them unset it once it's set! */ |
| 326 | if (!new_value && orig_value) |
| 327 | return -EROFS; |
| 328 | |
| 329 | if (new_value) |
| 330 | err = param_set_bool(val, kp); |
| 331 | |
| 332 | return err; |
| 333 | } |
| 334 | EXPORT_SYMBOL_GPL(param_set_bool_enable_only); |
| 335 | |
| 336 | const struct kernel_param_ops param_ops_bool_enable_only = { |
| 337 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
| 338 | .set = param_set_bool_enable_only, |
| 339 | .get = param_get_bool, |
| 340 | }; |
Luis R. Rodriguez | 154be21 | 2015-05-27 11:09:39 +0930 | [diff] [blame] | 341 | EXPORT_SYMBOL_GPL(param_ops_bool_enable_only); |
Luis R. Rodriguez | d19f05d | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 342 | |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 343 | /* This one must be bool. */ |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 344 | int param_set_invbool(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | { |
Rusty Russell | fddd520 | 2009-06-12 21:46:57 -0600 | [diff] [blame] | 346 | int ret; |
| 347 | bool boolval; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 348 | struct kernel_param dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 350 | dummy.arg = &boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | ret = param_set_bool(val, &dummy); |
| 352 | if (ret == 0) |
Rusty Russell | 9a71af2 | 2009-06-12 21:46:53 -0600 | [diff] [blame] | 353 | *(bool *)kp->arg = !boolval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return ret; |
| 355 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 356 | EXPORT_SYMBOL(param_set_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 358 | int param_get_invbool(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 360 | return sprintf(buffer, "%c\n", (*(bool *)kp->arg) ? 'N' : 'Y'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 362 | EXPORT_SYMBOL(param_get_invbool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 364 | const struct kernel_param_ops param_ops_invbool = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 365 | .set = param_set_invbool, |
| 366 | .get = param_get_invbool, |
| 367 | }; |
| 368 | EXPORT_SYMBOL(param_ops_invbool); |
| 369 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 370 | int param_set_bint(const char *val, const struct kernel_param *kp) |
| 371 | { |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 372 | /* Match bool exactly, by re-using it. */ |
| 373 | struct kernel_param boolkp = *kp; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 374 | bool v; |
| 375 | int ret; |
| 376 | |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 377 | boolkp.arg = &v; |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 378 | |
| 379 | ret = param_set_bool(val, &boolkp); |
| 380 | if (ret == 0) |
| 381 | *(int *)kp->arg = v; |
| 382 | return ret; |
| 383 | } |
| 384 | EXPORT_SYMBOL(param_set_bint); |
| 385 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 386 | const struct kernel_param_ops param_ops_bint = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 387 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 69116f2 | 2012-01-13 09:32:17 +1030 | [diff] [blame] | 388 | .set = param_set_bint, |
| 389 | .get = param_get_int, |
| 390 | }; |
| 391 | EXPORT_SYMBOL(param_ops_bint); |
| 392 | |
Bert Wesarg | 9730b5b | 2007-05-08 00:28:50 -0700 | [diff] [blame] | 393 | /* We break the rule and mangle the string. */ |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 394 | static int param_array(struct module *mod, |
| 395 | const char *name, |
Adrian Bunk | 9871728 | 2006-03-25 03:07:06 -0800 | [diff] [blame] | 396 | const char *val, |
| 397 | unsigned int min, unsigned int max, |
| 398 | void *elem, int elemsize, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 399 | int (*set)(const char *, const struct kernel_param *kp), |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 400 | s16 level, |
Richard Knutsson | eb38a99 | 2008-02-06 01:37:50 -0800 | [diff] [blame] | 401 | unsigned int *num) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
| 403 | int ret; |
| 404 | struct kernel_param kp; |
| 405 | char save; |
| 406 | |
| 407 | /* Get the name right for errors. */ |
| 408 | kp.name = name; |
| 409 | kp.arg = elem; |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 410 | kp.level = level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | *num = 0; |
| 413 | /* We expect a comma-separated list of values. */ |
| 414 | do { |
| 415 | int len; |
| 416 | |
| 417 | if (*num == max) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 418 | pr_err("%s: can only take %i arguments\n", name, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return -EINVAL; |
| 420 | } |
| 421 | len = strcspn(val, ","); |
| 422 | |
| 423 | /* nul-terminate and parse */ |
| 424 | save = val[len]; |
| 425 | ((char *)val)[len] = '\0'; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 426 | check_kparam_locked(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | ret = set(val, &kp); |
| 428 | |
| 429 | if (ret != 0) |
| 430 | return ret; |
| 431 | kp.arg += elemsize; |
| 432 | val += len+1; |
| 433 | (*num)++; |
| 434 | } while (save == ','); |
| 435 | |
| 436 | if (*num < min) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 437 | pr_err("%s: needs at least %i arguments\n", name, min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | return -EINVAL; |
| 439 | } |
| 440 | return 0; |
| 441 | } |
| 442 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 443 | 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] | 444 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 445 | const struct kparam_array *arr = kp->arr; |
Bert Wesarg | 31143a1 | 2005-04-16 15:25:42 -0700 | [diff] [blame] | 446 | unsigned int temp_num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 448 | 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] | 449 | arr->elemsize, arr->ops->set, kp->level, |
Rusty Russell | 3c7d76e | 2009-10-29 08:56:19 -0600 | [diff] [blame] | 450 | arr->num ?: &temp_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 453 | static int param_array_get(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
| 455 | int i, off, ret; |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 456 | const struct kparam_array *arr = kp->arr; |
Dan Streetman | 5104b7d | 2015-06-17 06:17:52 +0930 | [diff] [blame] | 457 | struct kernel_param p = *kp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 460 | /* Replace \n with comma */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (i) |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 462 | buffer[off - 1] = ','; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | p.arg = arr->elem + arr->elemsize * i; |
Rusty Russell | cf2fde7 | 2015-06-26 06:44:38 +0930 | [diff] [blame] | 464 | check_kparam_locked(p.mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 465 | ret = arr->ops->get(buffer + off, &p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | if (ret < 0) |
| 467 | return ret; |
| 468 | off += ret; |
| 469 | } |
| 470 | buffer[off] = '\0'; |
| 471 | return off; |
| 472 | } |
| 473 | |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 474 | static void param_array_free(void *arg) |
| 475 | { |
| 476 | unsigned int i; |
| 477 | const struct kparam_array *arr = arg; |
| 478 | |
| 479 | if (arr->ops->free) |
| 480 | for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) |
| 481 | arr->ops->free(arr->elem + arr->elemsize * i); |
| 482 | } |
| 483 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 484 | const struct kernel_param_ops param_array_ops = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 485 | .set = param_array_set, |
| 486 | .get = param_array_get, |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 487 | .free = param_array_free, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 488 | }; |
| 489 | EXPORT_SYMBOL(param_array_ops); |
| 490 | |
| 491 | int param_set_copystring(const char *val, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 493 | const struct kparam_string *kps = kp->str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | if (strlen(val)+1 > kps->maxlen) { |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 496 | pr_err("%s: string doesn't fit in %u chars.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | kp->name, kps->maxlen-1); |
| 498 | return -ENOSPC; |
| 499 | } |
| 500 | strcpy(kps->string, val); |
| 501 | return 0; |
| 502 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 503 | EXPORT_SYMBOL(param_set_copystring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 505 | int param_get_string(char *buffer, const struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
Jan Beulich | 22e48ea | 2007-10-16 23:29:34 -0700 | [diff] [blame] | 507 | const struct kparam_string *kps = kp->str; |
Jean Delvare | 96802e6 | 2017-10-03 16:16:38 -0700 | [diff] [blame] | 508 | return scnprintf(buffer, PAGE_SIZE, "%s\n", kps->string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
Rusty Russell | a14fe24 | 2010-08-11 23:04:11 -0600 | [diff] [blame] | 510 | EXPORT_SYMBOL(param_get_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Luis R. Rodriguez | 9c27847 | 2015-05-27 11:09:38 +0930 | [diff] [blame] | 512 | const struct kernel_param_ops param_ops_string = { |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 513 | .set = param_set_copystring, |
| 514 | .get = param_get_string, |
| 515 | }; |
| 516 | EXPORT_SYMBOL(param_ops_string); |
| 517 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 519 | #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
| 520 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | struct param_attribute |
| 523 | { |
| 524 | struct module_attribute mattr; |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 525 | const struct kernel_param *param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | }; |
| 527 | |
| 528 | struct module_param_attrs |
| 529 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 530 | unsigned int num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | struct attribute_group grp; |
| 532 | struct param_attribute attrs[0]; |
| 533 | }; |
| 534 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 535 | #ifdef CONFIG_SYSFS |
Edward Z. Yang | 350f825 | 2010-02-01 18:26:59 -0500 | [diff] [blame] | 536 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | static ssize_t param_attr_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 539 | struct module_kobject *mk, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | { |
| 541 | int count; |
| 542 | struct param_attribute *attribute = to_param_attr(mattr); |
| 543 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 544 | if (!attribute->param->ops->get) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return -EPERM; |
| 546 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 547 | kernel_param_lock(mk->mod); |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 548 | count = attribute->param->ops->get(buf, attribute->param); |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 549 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return count; |
| 551 | } |
| 552 | |
| 553 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
| 554 | static ssize_t param_attr_store(struct module_attribute *mattr, |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 555 | struct module_kobject *mk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | const char *buf, size_t len) |
| 557 | { |
| 558 | int err; |
| 559 | struct param_attribute *attribute = to_param_attr(mattr); |
| 560 | |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 561 | if (!attribute->param->ops->set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | return -EPERM; |
| 563 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 564 | kernel_param_lock(mk->mod); |
David Howells | 20657f6 | 2019-08-19 17:17:55 -0700 | [diff] [blame] | 565 | if (param_check_unsafe(attribute->param)) |
| 566 | err = attribute->param->ops->set(buf, attribute->param); |
| 567 | else |
| 568 | err = -EPERM; |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 569 | kernel_param_unlock(mk->mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | if (!err) |
| 571 | return len; |
| 572 | return err; |
| 573 | } |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 574 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
| 576 | #ifdef CONFIG_MODULES |
| 577 | #define __modinit |
| 578 | #else |
| 579 | #define __modinit __init |
| 580 | #endif |
| 581 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 582 | #ifdef CONFIG_SYSFS |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 583 | void kernel_param_lock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 584 | { |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 585 | mutex_lock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 586 | } |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 587 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 588 | void kernel_param_unlock(struct module *mod) |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 589 | { |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 590 | mutex_unlock(KPARAM_MUTEX(mod)); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 591 | } |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 592 | |
Dan Streetman | b51d23e4 | 2015-06-17 06:18:52 +0930 | [diff] [blame] | 593 | EXPORT_SYMBOL(kernel_param_lock); |
| 594 | EXPORT_SYMBOL(kernel_param_unlock); |
Rusty Russell | 907b29e | 2010-08-11 23:04:19 -0600 | [diff] [blame] | 595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | /* |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 597 | * add_sysfs_param - add a parameter to sysfs |
| 598 | * @mk: struct module_kobject |
Jean Delvare | 630cc2b | 2017-10-03 16:14:18 -0700 | [diff] [blame] | 599 | * @kp: the actual parameter definition to add to sysfs |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 600 | * @name: name of parameter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 602 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
| 603 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
| 604 | * if there's an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 606 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 607 | const struct kernel_param *kp, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 608 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 610 | struct module_param_attrs *new_mp; |
| 611 | struct attribute **new_attrs; |
| 612 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 614 | /* We don't bother calling this with invisible parameters. */ |
| 615 | BUG_ON(!kp->perm); |
| 616 | |
| 617 | if (!mk->mp) { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 618 | /* First allocation. */ |
| 619 | mk->mp = kzalloc(sizeof(*mk->mp), GFP_KERNEL); |
| 620 | if (!mk->mp) |
| 621 | return -ENOMEM; |
| 622 | mk->mp->grp.name = "parameters"; |
| 623 | /* NULL-terminated attribute array. */ |
| 624 | mk->mp->grp.attrs = kzalloc(sizeof(mk->mp->grp.attrs[0]), |
| 625 | GFP_KERNEL); |
| 626 | /* Caller will cleanup via free_module_param_attrs */ |
| 627 | if (!mk->mp->grp.attrs) |
| 628 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 631 | /* Enlarge allocations. */ |
| 632 | new_mp = krealloc(mk->mp, |
| 633 | sizeof(*mk->mp) + |
| 634 | sizeof(mk->mp->attrs[0]) * (mk->mp->num + 1), |
| 635 | GFP_KERNEL); |
| 636 | if (!new_mp) |
| 637 | return -ENOMEM; |
| 638 | mk->mp = new_mp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 639 | |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 640 | /* Extra pointer for NULL terminator */ |
| 641 | new_attrs = krealloc(mk->mp->grp.attrs, |
| 642 | sizeof(mk->mp->grp.attrs[0]) * (mk->mp->num + 2), |
| 643 | GFP_KERNEL); |
| 644 | if (!new_attrs) |
| 645 | return -ENOMEM; |
| 646 | mk->mp->grp.attrs = new_attrs; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 647 | |
| 648 | /* Tack new one on the end. */ |
Rusty Russell | c772be5 | 2015-01-20 09:07:04 +1030 | [diff] [blame] | 649 | 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] | 650 | sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr); |
| 651 | mk->mp->attrs[mk->mp->num].param = kp; |
| 652 | mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show; |
Kees Cook | b0a65b0 | 2014-12-12 13:36:49 +1030 | [diff] [blame] | 653 | /* Do not allow runtime DAC changes to make param writable. */ |
| 654 | if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0) |
| 655 | mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; |
Rusty Russell | 574732c | 2014-12-23 15:05:36 +1030 | [diff] [blame] | 656 | else |
| 657 | mk->mp->attrs[mk->mp->num].mattr.store = NULL; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 658 | mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name; |
| 659 | mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm; |
| 660 | mk->mp->num++; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 661 | |
| 662 | /* Fix up all the pointers, since krealloc can move us */ |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 663 | for (i = 0; i < mk->mp->num; i++) |
| 664 | mk->mp->grp.attrs[i] = &mk->mp->attrs[i].mattr.attr; |
| 665 | mk->mp->grp.attrs[mk->mp->num] = NULL; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 666 | return 0; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 667 | } |
| 668 | |
Linus Torvalds | d244118 | 2008-10-23 12:07:17 -0700 | [diff] [blame] | 669 | #ifdef CONFIG_MODULES |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 670 | static void free_module_param_attrs(struct module_kobject *mk) |
| 671 | { |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 672 | if (mk->mp) |
| 673 | kfree(mk->mp->grp.attrs); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 674 | kfree(mk->mp); |
| 675 | mk->mp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* |
| 679 | * module_param_sysfs_setup - setup sysfs support for one module |
| 680 | * @mod: module |
| 681 | * @kparam: module parameters (array) |
| 682 | * @num_params: number of module parameters |
| 683 | * |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 684 | * Adds sysfs entries for module parameters under |
| 685 | * /sys/module/[mod->name]/parameters/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | */ |
| 687 | int module_param_sysfs_setup(struct module *mod, |
Rusty Russell | 9bbb9e5 | 2010-08-11 23:04:12 -0600 | [diff] [blame] | 688 | const struct kernel_param *kparam, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | unsigned int num_params) |
| 690 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 691 | int i, err; |
| 692 | bool params = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 694 | for (i = 0; i < num_params; i++) { |
| 695 | if (kparam[i].perm == 0) |
| 696 | continue; |
| 697 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 698 | if (err) { |
| 699 | free_module_param_attrs(&mod->mkobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 700 | return err; |
Rusty Russell | 18eb74f | 2014-11-10 09:32:29 +1030 | [diff] [blame] | 701 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 702 | params = true; |
| 703 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 705 | if (!params) |
| 706 | return 0; |
| 707 | |
| 708 | /* Create the param group. */ |
| 709 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
| 710 | if (err) |
| 711 | free_module_param_attrs(&mod->mkobj); |
| 712 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | /* |
| 716 | * module_param_sysfs_remove - remove sysfs support for one module |
| 717 | * @mod: module |
| 718 | * |
| 719 | * Remove sysfs entries for module parameters and the corresponding |
| 720 | * kobject. |
| 721 | */ |
| 722 | void module_param_sysfs_remove(struct module *mod) |
| 723 | { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 724 | if (mod->mkobj.mp) { |
| 725 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | /* We are positive that no one is using any param |
| 727 | * attrs at this point. Deallocate immediately. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 728 | free_module_param_attrs(&mod->mkobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | } |
| 731 | #endif |
| 732 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 733 | void destroy_params(const struct kernel_param *params, unsigned num) |
| 734 | { |
Rusty Russell | e6df34a | 2010-08-11 23:04:17 -0600 | [diff] [blame] | 735 | unsigned int i; |
| 736 | |
| 737 | for (i = 0; i < num; i++) |
| 738 | if (params[i].ops->free) |
| 739 | params[i].ops->free(params[i].arg); |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 740 | } |
| 741 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 742 | static struct module_kobject * __init locate_module_kobject(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
| 744 | struct module_kobject *mk; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 745 | struct kobject *kobj; |
| 746 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 748 | kobj = kset_find_obj(module_kset, name); |
| 749 | if (kobj) { |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 750 | mk = to_module_kobject(kobj); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 751 | } else { |
| 752 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
| 753 | BUG_ON(!mk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 755 | mk->mod = THIS_MODULE; |
| 756 | mk->kobj.kset = module_kset; |
| 757 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
| 758 | "%s", name); |
Kay Sievers | 88bfa32 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 759 | #ifdef CONFIG_MODULES |
| 760 | if (!err) |
| 761 | err = sysfs_create_file(&mk->kobj, &module_uevent.attr); |
| 762 | #endif |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 763 | if (err) { |
| 764 | kobject_put(&mk->kobj); |
Jim Cromie | b5f3abf | 2012-05-03 18:22:44 -0600 | [diff] [blame] | 765 | 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] | 766 | name, err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 767 | return NULL; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 768 | } |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 769 | |
| 770 | /* So that we hold reference in both cases. */ |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 771 | kobject_get(&mk->kobj); |
Greg Kroah-Hartman | 74c5b59 | 2007-07-30 11:26:38 -0700 | [diff] [blame] | 772 | } |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 773 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 774 | return mk; |
| 775 | } |
| 776 | |
| 777 | static void __init kernel_add_sysfs_param(const char *name, |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 778 | const struct kernel_param *kparam, |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 779 | unsigned int name_skip) |
| 780 | { |
| 781 | struct module_kobject *mk; |
| 782 | int err; |
| 783 | |
| 784 | mk = locate_module_kobject(name); |
| 785 | if (!mk) |
| 786 | return; |
| 787 | |
| 788 | /* We need to remove old parameters before adding more. */ |
| 789 | if (mk->mp) |
| 790 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
| 791 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 792 | /* These should not fail at boot. */ |
| 793 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
| 794 | BUG_ON(err); |
| 795 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
| 796 | BUG_ON(err); |
Kay Sievers | f30c53a | 2007-01-15 20:22:02 +0100 | [diff] [blame] | 797 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 798 | kobject_put(&mk->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | /* |
Jean Delvare | b634d13 | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 802 | * param_sysfs_builtin - add sysfs parameters for built-in modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * |
| 804 | * Add module_parameters to sysfs for "modules" built into the kernel. |
| 805 | * |
| 806 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
| 807 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
| 808 | * extract the "module" name for all built-in kernel_param-eters, |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 809 | * and for all who have the same, call kernel_add_sysfs_param. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | */ |
| 811 | static void __init param_sysfs_builtin(void) |
| 812 | { |
Geert Uytterhoeven | 63a12d9 | 2014-10-13 15:55:44 -0700 | [diff] [blame] | 813 | const struct kernel_param *kp; |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 814 | unsigned int name_len; |
| 815 | char modname[MODULE_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 817 | for (kp = __start___param; kp < __stop___param; kp++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | char *dot; |
| 819 | |
Rusty Russell | 9b473de | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 820 | if (kp->perm == 0) |
| 821 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Rusty Russell | 730b69d | 2008-10-22 10:00:22 -0500 | [diff] [blame] | 823 | dot = strchr(kp->name, '.'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | if (!dot) { |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 825 | /* This happens for core_param() */ |
| 826 | strcpy(modname, "kernel"); |
| 827 | name_len = 0; |
| 828 | } else { |
| 829 | name_len = dot - kp->name + 1; |
| 830 | strlcpy(modname, kp->name, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
Rusty Russell | 67e67ce | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 832 | kernel_add_sysfs_param(modname, kp, name_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 836 | ssize_t __modver_version_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 837 | struct module_kobject *mk, char *buf) |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 838 | { |
| 839 | struct module_version_attribute *vattr = |
| 840 | container_of(mattr, struct module_version_attribute, mattr); |
| 841 | |
Chen Gang | f4940ab | 2013-08-20 15:35:04 +0930 | [diff] [blame] | 842 | return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 843 | } |
| 844 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 845 | extern const struct module_version_attribute *__start___modver[]; |
| 846 | extern const struct module_version_attribute *__stop___modver[]; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 847 | |
| 848 | static void __init version_sysfs_builtin(void) |
| 849 | { |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 850 | const struct module_version_attribute **p; |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 851 | struct module_kobject *mk; |
| 852 | int err; |
| 853 | |
Dmitry Torokhov | b4bc8428 | 2011-02-07 16:02:25 -0800 | [diff] [blame] | 854 | for (p = __start___modver; p < __stop___modver; p++) { |
| 855 | const struct module_version_attribute *vattr = *p; |
| 856 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 857 | mk = locate_module_kobject(vattr->module_name); |
| 858 | if (mk) { |
| 859 | err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); |
Rusty Russell | 74c3dea3 | 2015-06-17 06:16:52 +0930 | [diff] [blame] | 860 | WARN_ON_ONCE(err); |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 861 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
| 862 | kobject_put(&mk->kobj); |
| 863 | } |
| 864 | } |
| 865 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | /* module-related sysfs stuff */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | static ssize_t module_attr_show(struct kobject *kobj, |
| 870 | struct attribute *attr, |
| 871 | char *buf) |
| 872 | { |
| 873 | struct module_attribute *attribute; |
| 874 | struct module_kobject *mk; |
| 875 | int ret; |
| 876 | |
| 877 | attribute = to_module_attr(attr); |
| 878 | mk = to_module_kobject(kobj); |
| 879 | |
| 880 | if (!attribute->show) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 881 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 883 | ret = attribute->show(attribute, mk, buf); |
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 | return ret; |
| 886 | } |
| 887 | |
| 888 | static ssize_t module_attr_store(struct kobject *kobj, |
| 889 | struct attribute *attr, |
| 890 | const char *buf, size_t len) |
| 891 | { |
| 892 | struct module_attribute *attribute; |
| 893 | struct module_kobject *mk; |
| 894 | int ret; |
| 895 | |
| 896 | attribute = to_module_attr(attr); |
| 897 | mk = to_module_kobject(kobj); |
| 898 | |
| 899 | if (!attribute->store) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 900 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 902 | ret = attribute->store(attribute, mk, buf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | return ret; |
| 905 | } |
| 906 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 907 | static const struct sysfs_ops module_sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | .show = module_attr_show, |
| 909 | .store = module_attr_store, |
| 910 | }; |
| 911 | |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 912 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 913 | { |
| 914 | struct kobj_type *ktype = get_ktype(kobj); |
| 915 | |
| 916 | if (ktype == &module_ktype) |
| 917 | return 1; |
| 918 | return 0; |
| 919 | } |
| 920 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 921 | static const struct kset_uevent_ops module_uevent_ops = { |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 922 | .filter = uevent_filter, |
| 923 | }; |
| 924 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 925 | struct kset *module_kset; |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 926 | int module_sysfs_initialized; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 928 | static void module_kobj_release(struct kobject *kobj) |
| 929 | { |
| 930 | struct module_kobject *mk = to_module_kobject(kobj); |
| 931 | complete(mk->kobj_completion); |
| 932 | } |
| 933 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 934 | struct kobj_type module_ktype = { |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 935 | .release = module_kobj_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | .sysfs_ops = &module_sysfs_ops, |
| 937 | }; |
| 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | /* |
| 940 | * param_sysfs_init - wrapper for built-in params support |
| 941 | */ |
| 942 | static int __init param_sysfs_init(void) |
| 943 | { |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 944 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
| 945 | if (!module_kset) { |
| 946 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
| 947 | __FILE__, __LINE__); |
| 948 | return -ENOMEM; |
Randy Dunlap | d8c7649 | 2006-09-29 01:58:55 -0700 | [diff] [blame] | 949 | } |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 950 | module_sysfs_initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
Dmitry Torokhov | e94965e | 2010-12-15 14:00:19 -0800 | [diff] [blame] | 952 | version_sysfs_builtin(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | param_sysfs_builtin(); |
| 954 | |
| 955 | return 0; |
| 956 | } |
Mark Huang | d10be6d | 2006-09-29 01:59:34 -0700 | [diff] [blame] | 957 | subsys_initcall(param_sysfs_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
Greg Kroah-Hartman | 7405c1e | 2007-11-01 10:39:50 -0700 | [diff] [blame] | 959 | #endif /* CONFIG_SYSFS */ |