Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 1 | /* |
| 2 | * trace_events_trigger - trace event triggers |
| 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 | * |
| 18 | * Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com> |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/ctype.h> |
| 23 | #include <linux/mutex.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | #include "trace.h" |
| 27 | |
| 28 | static LIST_HEAD(trigger_commands); |
| 29 | static DEFINE_MUTEX(trigger_cmd_mutex); |
| 30 | |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 31 | void trigger_data_free(struct event_trigger_data *data) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 32 | { |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 33 | if (data->cmd_ops->set_filter) |
| 34 | data->cmd_ops->set_filter(NULL, data, NULL); |
| 35 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 36 | synchronize_sched(); /* make sure current triggers exit before free */ |
| 37 | kfree(data); |
| 38 | } |
| 39 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 40 | /** |
| 41 | * event_triggers_call - Call triggers associated with a trace event |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 42 | * @file: The trace_event_file associated with the event |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 43 | * @rec: The trace entry for the event, NULL for unconditional invocation |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 44 | * |
| 45 | * For each trigger associated with an event, invoke the trigger |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 46 | * function registered with the associated trigger command. If rec is |
| 47 | * non-NULL, it means that the trigger requires further processing and |
| 48 | * shouldn't be unconditionally invoked. If rec is non-NULL and the |
| 49 | * trigger has a filter associated with it, rec will checked against |
| 50 | * the filter and if the record matches the trigger will be invoked. |
| 51 | * If the trigger is a 'post_trigger', meaning it shouldn't be invoked |
| 52 | * in any case until the current event is written, the trigger |
| 53 | * function isn't invoked but the bit associated with the deferred |
| 54 | * trigger is set in the return value. |
| 55 | * |
| 56 | * Returns an enum event_trigger_type value containing a set bit for |
| 57 | * any trigger that should be deferred, ETT_NONE if nothing to defer. |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 58 | * |
| 59 | * Called from tracepoint handlers (with rcu_read_lock_sched() held). |
| 60 | * |
| 61 | * Return: an enum event_trigger_type value containing a set bit for |
| 62 | * any trigger that should be deferred, ETT_NONE if nothing to defer. |
| 63 | */ |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 64 | enum event_trigger_type |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 65 | event_triggers_call(struct trace_event_file *file, void *rec) |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 66 | { |
| 67 | struct event_trigger_data *data; |
| 68 | enum event_trigger_type tt = ETT_NONE; |
Steven Rostedt (Red Hat) | d8a30f2 | 2013-12-21 21:55:17 -0500 | [diff] [blame] | 69 | struct event_filter *filter; |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 70 | |
| 71 | if (list_empty(&file->triggers)) |
| 72 | return tt; |
| 73 | |
| 74 | list_for_each_entry_rcu(data, &file->triggers, list) { |
Tom Zanussi | 104f281 | 2015-12-10 12:50:47 -0600 | [diff] [blame] | 75 | if (data->paused) |
| 76 | continue; |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 77 | if (!rec) { |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 78 | data->ops->func(data, rec); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 79 | continue; |
| 80 | } |
Steven Rostedt (Red Hat) | 561a4fe | 2014-05-02 13:30:04 -0400 | [diff] [blame] | 81 | filter = rcu_dereference_sched(data->filter); |
Steven Rostedt (Red Hat) | d8a30f2 | 2013-12-21 21:55:17 -0500 | [diff] [blame] | 82 | if (filter && !filter_match_preds(filter, rec)) |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 83 | continue; |
Steven Rostedt (Red Hat) | 353206f | 2016-02-22 15:55:09 -0500 | [diff] [blame] | 84 | if (event_command_post_trigger(data->cmd_ops)) { |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 85 | tt |= data->cmd_ops->trigger_type; |
| 86 | continue; |
| 87 | } |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 88 | data->ops->func(data, rec); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 89 | } |
| 90 | return tt; |
| 91 | } |
| 92 | EXPORT_SYMBOL_GPL(event_triggers_call); |
| 93 | |
| 94 | /** |
| 95 | * event_triggers_post_call - Call 'post_triggers' for a trace event |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 96 | * @file: The trace_event_file associated with the event |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 97 | * @tt: enum event_trigger_type containing a set bit for each trigger to invoke |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 98 | * @rec: The trace entry for the event |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 99 | * |
| 100 | * For each trigger associated with an event, invoke the trigger |
| 101 | * function registered with the associated trigger command, if the |
| 102 | * corresponding bit is set in the tt enum passed into this function. |
| 103 | * See @event_triggers_call for details on how those bits are set. |
| 104 | * |
| 105 | * Called from tracepoint handlers (with rcu_read_lock_sched() held). |
| 106 | */ |
| 107 | void |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 108 | event_triggers_post_call(struct trace_event_file *file, |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 109 | enum event_trigger_type tt, |
| 110 | void *rec) |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 111 | { |
| 112 | struct event_trigger_data *data; |
| 113 | |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 114 | list_for_each_entry_rcu(data, &file->triggers, list) { |
Tom Zanussi | 104f281 | 2015-12-10 12:50:47 -0600 | [diff] [blame] | 115 | if (data->paused) |
| 116 | continue; |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 117 | if (data->cmd_ops->trigger_type & tt) |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 118 | data->ops->func(data, rec); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 119 | } |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 120 | } |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 121 | EXPORT_SYMBOL_GPL(event_triggers_post_call); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 122 | |
Steven Rostedt (Red Hat) | dd97b95 | 2014-01-07 10:31:04 -0500 | [diff] [blame] | 123 | #define SHOW_AVAILABLE_TRIGGERS (void *)(1UL) |
| 124 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 125 | static void *trigger_next(struct seq_file *m, void *t, loff_t *pos) |
| 126 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 127 | struct trace_event_file *event_file = event_file_data(m->private); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 128 | |
Vasily Averin | 38a71bb | 2020-01-24 10:03:06 +0300 | [diff] [blame] | 129 | if (t == SHOW_AVAILABLE_TRIGGERS) { |
| 130 | (*pos)++; |
Steven Rostedt (Red Hat) | dd97b95 | 2014-01-07 10:31:04 -0500 | [diff] [blame] | 131 | return NULL; |
Vasily Averin | 38a71bb | 2020-01-24 10:03:06 +0300 | [diff] [blame] | 132 | } |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 133 | return seq_list_next(t, &event_file->triggers, pos); |
| 134 | } |
| 135 | |
| 136 | static void *trigger_start(struct seq_file *m, loff_t *pos) |
| 137 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 138 | struct trace_event_file *event_file; |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 139 | |
| 140 | /* ->stop() is called even if ->start() fails */ |
| 141 | mutex_lock(&event_mutex); |
| 142 | event_file = event_file_data(m->private); |
| 143 | if (unlikely(!event_file)) |
| 144 | return ERR_PTR(-ENODEV); |
| 145 | |
Steven Rostedt (Red Hat) | dd97b95 | 2014-01-07 10:31:04 -0500 | [diff] [blame] | 146 | if (list_empty(&event_file->triggers)) |
| 147 | return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL; |
| 148 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 149 | return seq_list_start(&event_file->triggers, *pos); |
| 150 | } |
| 151 | |
| 152 | static void trigger_stop(struct seq_file *m, void *t) |
| 153 | { |
| 154 | mutex_unlock(&event_mutex); |
| 155 | } |
| 156 | |
| 157 | static int trigger_show(struct seq_file *m, void *v) |
| 158 | { |
| 159 | struct event_trigger_data *data; |
Steven Rostedt (Red Hat) | dd97b95 | 2014-01-07 10:31:04 -0500 | [diff] [blame] | 160 | struct event_command *p; |
| 161 | |
| 162 | if (v == SHOW_AVAILABLE_TRIGGERS) { |
| 163 | seq_puts(m, "# Available triggers:\n"); |
| 164 | seq_putc(m, '#'); |
| 165 | mutex_lock(&trigger_cmd_mutex); |
| 166 | list_for_each_entry_reverse(p, &trigger_commands, list) |
| 167 | seq_printf(m, " %s", p->name); |
| 168 | seq_putc(m, '\n'); |
| 169 | mutex_unlock(&trigger_cmd_mutex); |
| 170 | return 0; |
| 171 | } |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 172 | |
| 173 | data = list_entry(v, struct event_trigger_data, list); |
| 174 | data->ops->print(m, data->ops, data); |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static const struct seq_operations event_triggers_seq_ops = { |
| 180 | .start = trigger_start, |
| 181 | .next = trigger_next, |
| 182 | .stop = trigger_stop, |
| 183 | .show = trigger_show, |
| 184 | }; |
| 185 | |
| 186 | static int event_trigger_regex_open(struct inode *inode, struct file *file) |
| 187 | { |
| 188 | int ret = 0; |
| 189 | |
| 190 | mutex_lock(&event_mutex); |
| 191 | |
| 192 | if (unlikely(!event_file_data(file))) { |
| 193 | mutex_unlock(&event_mutex); |
| 194 | return -ENODEV; |
| 195 | } |
| 196 | |
Tom Zanussi | a88e1cf | 2015-12-10 12:50:49 -0600 | [diff] [blame] | 197 | if ((file->f_mode & FMODE_WRITE) && |
| 198 | (file->f_flags & O_TRUNC)) { |
| 199 | struct trace_event_file *event_file; |
| 200 | struct event_command *p; |
| 201 | |
| 202 | event_file = event_file_data(file); |
| 203 | |
| 204 | list_for_each_entry(p, &trigger_commands, list) { |
| 205 | if (p->unreg_all) |
| 206 | p->unreg_all(event_file); |
| 207 | } |
| 208 | } |
| 209 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 210 | if (file->f_mode & FMODE_READ) { |
| 211 | ret = seq_open(file, &event_triggers_seq_ops); |
| 212 | if (!ret) { |
| 213 | struct seq_file *m = file->private_data; |
| 214 | m->private = file; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | mutex_unlock(&event_mutex); |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 223 | static int trigger_process_regex(struct trace_event_file *file, char *buff) |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 224 | { |
| 225 | char *command, *next = buff; |
| 226 | struct event_command *p; |
| 227 | int ret = -EINVAL; |
| 228 | |
| 229 | command = strsep(&next, ": \t"); |
| 230 | command = (command[0] != '!') ? command : command + 1; |
| 231 | |
| 232 | mutex_lock(&trigger_cmd_mutex); |
| 233 | list_for_each_entry(p, &trigger_commands, list) { |
| 234 | if (strcmp(p->name, command) == 0) { |
| 235 | ret = p->func(p, file, buff, command, next); |
| 236 | goto out_unlock; |
| 237 | } |
| 238 | } |
| 239 | out_unlock: |
| 240 | mutex_unlock(&trigger_cmd_mutex); |
| 241 | |
| 242 | return ret; |
| 243 | } |
| 244 | |
| 245 | static ssize_t event_trigger_regex_write(struct file *file, |
| 246 | const char __user *ubuf, |
| 247 | size_t cnt, loff_t *ppos) |
| 248 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 249 | struct trace_event_file *event_file; |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 250 | ssize_t ret; |
| 251 | char *buf; |
| 252 | |
| 253 | if (!cnt) |
| 254 | return 0; |
| 255 | |
| 256 | if (cnt >= PAGE_SIZE) |
| 257 | return -EINVAL; |
| 258 | |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 259 | buf = memdup_user_nul(ubuf, cnt); |
| 260 | if (IS_ERR(buf)) |
| 261 | return PTR_ERR(buf); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 262 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 263 | strim(buf); |
| 264 | |
| 265 | mutex_lock(&event_mutex); |
| 266 | event_file = event_file_data(file); |
| 267 | if (unlikely(!event_file)) { |
| 268 | mutex_unlock(&event_mutex); |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 269 | kfree(buf); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 270 | return -ENODEV; |
| 271 | } |
| 272 | ret = trigger_process_regex(event_file, buf); |
| 273 | mutex_unlock(&event_mutex); |
| 274 | |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 275 | kfree(buf); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 276 | if (ret < 0) |
| 277 | goto out; |
| 278 | |
| 279 | *ppos += cnt; |
| 280 | ret = cnt; |
| 281 | out: |
| 282 | return ret; |
| 283 | } |
| 284 | |
| 285 | static int event_trigger_regex_release(struct inode *inode, struct file *file) |
| 286 | { |
| 287 | mutex_lock(&event_mutex); |
| 288 | |
| 289 | if (file->f_mode & FMODE_READ) |
| 290 | seq_release(inode, file); |
| 291 | |
| 292 | mutex_unlock(&event_mutex); |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static ssize_t |
| 298 | event_trigger_write(struct file *filp, const char __user *ubuf, |
| 299 | size_t cnt, loff_t *ppos) |
| 300 | { |
| 301 | return event_trigger_regex_write(filp, ubuf, cnt, ppos); |
| 302 | } |
| 303 | |
| 304 | static int |
| 305 | event_trigger_open(struct inode *inode, struct file *filp) |
| 306 | { |
| 307 | return event_trigger_regex_open(inode, filp); |
| 308 | } |
| 309 | |
| 310 | static int |
| 311 | event_trigger_release(struct inode *inode, struct file *file) |
| 312 | { |
| 313 | return event_trigger_regex_release(inode, file); |
| 314 | } |
| 315 | |
| 316 | const struct file_operations event_trigger_fops = { |
| 317 | .open = event_trigger_open, |
| 318 | .read = seq_read, |
| 319 | .write = event_trigger_write, |
Steven Rostedt (Red Hat) | 098c879 | 2013-12-21 17:39:40 -0500 | [diff] [blame] | 320 | .llseek = tracing_lseek, |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 321 | .release = event_trigger_release, |
| 322 | }; |
| 323 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 324 | /* |
| 325 | * Currently we only register event commands from __init, so mark this |
| 326 | * __init too. |
| 327 | */ |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 328 | __init int register_event_command(struct event_command *cmd) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 329 | { |
| 330 | struct event_command *p; |
| 331 | int ret = 0; |
| 332 | |
| 333 | mutex_lock(&trigger_cmd_mutex); |
| 334 | list_for_each_entry(p, &trigger_commands, list) { |
| 335 | if (strcmp(cmd->name, p->name) == 0) { |
| 336 | ret = -EBUSY; |
| 337 | goto out_unlock; |
| 338 | } |
| 339 | } |
| 340 | list_add(&cmd->list, &trigger_commands); |
| 341 | out_unlock: |
| 342 | mutex_unlock(&trigger_cmd_mutex); |
| 343 | |
| 344 | return ret; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Currently we only unregister event commands from __init, so mark |
| 349 | * this __init too. |
| 350 | */ |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 351 | __init int unregister_event_command(struct event_command *cmd) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 352 | { |
| 353 | struct event_command *p, *n; |
| 354 | int ret = -ENODEV; |
| 355 | |
| 356 | mutex_lock(&trigger_cmd_mutex); |
| 357 | list_for_each_entry_safe(p, n, &trigger_commands, list) { |
| 358 | if (strcmp(cmd->name, p->name) == 0) { |
| 359 | ret = 0; |
| 360 | list_del_init(&p->list); |
| 361 | goto out_unlock; |
| 362 | } |
| 363 | } |
| 364 | out_unlock: |
| 365 | mutex_unlock(&trigger_cmd_mutex); |
| 366 | |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * event_trigger_print - Generic event_trigger_ops @print implementation |
| 372 | * @name: The name of the event trigger |
| 373 | * @m: The seq_file being printed to |
| 374 | * @data: Trigger-specific data |
| 375 | * @filter_str: filter_str to print, if present |
| 376 | * |
| 377 | * Common implementation for event triggers to print themselves. |
| 378 | * |
| 379 | * Usually wrapped by a function that simply sets the @name of the |
| 380 | * trigger command and then invokes this. |
| 381 | * |
| 382 | * Return: 0 on success, errno otherwise |
| 383 | */ |
| 384 | static int |
| 385 | event_trigger_print(const char *name, struct seq_file *m, |
| 386 | void *data, char *filter_str) |
| 387 | { |
| 388 | long count = (long)data; |
| 389 | |
Rasmus Villemoes | fa6f0cc | 2014-11-08 21:42:10 +0100 | [diff] [blame] | 390 | seq_puts(m, name); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 391 | |
| 392 | if (count == -1) |
| 393 | seq_puts(m, ":unlimited"); |
| 394 | else |
| 395 | seq_printf(m, ":count=%ld", count); |
| 396 | |
| 397 | if (filter_str) |
| 398 | seq_printf(m, " if %s\n", filter_str); |
| 399 | else |
Rasmus Villemoes | 1177e43 | 2014-11-08 21:42:12 +0100 | [diff] [blame] | 400 | seq_putc(m, '\n'); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | /** |
| 406 | * event_trigger_init - Generic event_trigger_ops @init implementation |
| 407 | * @ops: The trigger ops associated with the trigger |
| 408 | * @data: Trigger-specific data |
| 409 | * |
| 410 | * Common implementation of event trigger initialization. |
| 411 | * |
| 412 | * Usually used directly as the @init method in event trigger |
| 413 | * implementations. |
| 414 | * |
| 415 | * Return: 0 on success, errno otherwise |
| 416 | */ |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 417 | int event_trigger_init(struct event_trigger_ops *ops, |
| 418 | struct event_trigger_data *data) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 419 | { |
| 420 | data->ref++; |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * event_trigger_free - Generic event_trigger_ops @free implementation |
| 426 | * @ops: The trigger ops associated with the trigger |
| 427 | * @data: Trigger-specific data |
| 428 | * |
| 429 | * Common implementation of event trigger de-initialization. |
| 430 | * |
| 431 | * Usually used directly as the @free method in event trigger |
| 432 | * implementations. |
| 433 | */ |
| 434 | static void |
| 435 | event_trigger_free(struct event_trigger_ops *ops, |
| 436 | struct event_trigger_data *data) |
| 437 | { |
| 438 | if (WARN_ON_ONCE(data->ref <= 0)) |
| 439 | return; |
| 440 | |
| 441 | data->ref--; |
| 442 | if (!data->ref) |
| 443 | trigger_data_free(data); |
| 444 | } |
| 445 | |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 446 | int trace_event_trigger_enable_disable(struct trace_event_file *file, |
| 447 | int trigger_enable) |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 448 | { |
| 449 | int ret = 0; |
| 450 | |
| 451 | if (trigger_enable) { |
| 452 | if (atomic_inc_return(&file->tm_ref) > 1) |
| 453 | return ret; |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 454 | set_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 455 | ret = trace_event_enable_disable(file, 1, 1); |
| 456 | } else { |
| 457 | if (atomic_dec_return(&file->tm_ref) > 0) |
| 458 | return ret; |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 459 | clear_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 460 | ret = trace_event_enable_disable(file, 0, 1); |
| 461 | } |
| 462 | |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * clear_event_triggers - Clear all triggers associated with a trace array |
| 468 | * @tr: The trace array to clear |
| 469 | * |
| 470 | * For each trigger, the triggering event has its tm_ref decremented |
| 471 | * via trace_event_trigger_enable_disable(), and any associated event |
| 472 | * (in the case of enable/disable_event triggers) will have its sm_ref |
| 473 | * decremented via free()->trace_event_enable_disable(). That |
| 474 | * combination effectively reverses the soft-mode/trigger state added |
| 475 | * by trigger registration. |
| 476 | * |
| 477 | * Must be called with event_mutex held. |
| 478 | */ |
| 479 | void |
| 480 | clear_event_triggers(struct trace_array *tr) |
| 481 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 482 | struct trace_event_file *file; |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 483 | |
| 484 | list_for_each_entry(file, &tr->events, list) { |
Steven Rostedt (VMware) | dfc80dc | 2018-05-27 20:54:44 -0400 | [diff] [blame] | 485 | struct event_trigger_data *data, *n; |
| 486 | list_for_each_entry_safe(data, n, &file->triggers, list) { |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 487 | trace_event_trigger_enable_disable(file, 0); |
Steven Rostedt (VMware) | dfc80dc | 2018-05-27 20:54:44 -0400 | [diff] [blame] | 488 | list_del_rcu(&data->list); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 489 | if (data->ops->free) |
| 490 | data->ops->free(data->ops, data); |
| 491 | } |
| 492 | } |
| 493 | } |
| 494 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 495 | /** |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 496 | * update_cond_flag - Set or reset the TRIGGER_COND bit |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 497 | * @file: The trace_event_file associated with the event |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 498 | * |
| 499 | * If an event has triggers and any of those triggers has a filter or |
| 500 | * a post_trigger, trigger invocation needs to be deferred until after |
| 501 | * the current event has logged its data, and the event should have |
| 502 | * its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be |
| 503 | * cleared. |
| 504 | */ |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 505 | void update_cond_flag(struct trace_event_file *file) |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 506 | { |
| 507 | struct event_trigger_data *data; |
| 508 | bool set_cond = false; |
| 509 | |
| 510 | list_for_each_entry_rcu(data, &file->triggers, list) { |
Steven Rostedt (Red Hat) | 353206f | 2016-02-22 15:55:09 -0500 | [diff] [blame] | 511 | if (data->filter || event_command_post_trigger(data->cmd_ops) || |
| 512 | event_command_needs_rec(data->cmd_ops)) { |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 513 | set_cond = true; |
| 514 | break; |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | if (set_cond) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 519 | set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 520 | else |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 521 | clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /** |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 525 | * register_trigger - Generic event_command @reg implementation |
| 526 | * @glob: The raw string used to register the trigger |
| 527 | * @ops: The trigger ops associated with the trigger |
| 528 | * @data: Trigger-specific data to associate with the trigger |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 529 | * @file: The trace_event_file associated with the event |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 530 | * |
| 531 | * Common implementation for event trigger registration. |
| 532 | * |
| 533 | * Usually used directly as the @reg method in event command |
| 534 | * implementations. |
| 535 | * |
| 536 | * Return: 0 on success, errno otherwise |
| 537 | */ |
| 538 | static int register_trigger(char *glob, struct event_trigger_ops *ops, |
| 539 | struct event_trigger_data *data, |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 540 | struct trace_event_file *file) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 541 | { |
| 542 | struct event_trigger_data *test; |
| 543 | int ret = 0; |
| 544 | |
| 545 | list_for_each_entry_rcu(test, &file->triggers, list) { |
| 546 | if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) { |
| 547 | ret = -EEXIST; |
| 548 | goto out; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | if (data->ops->init) { |
| 553 | ret = data->ops->init(data->ops, data); |
| 554 | if (ret < 0) |
| 555 | goto out; |
| 556 | } |
| 557 | |
| 558 | list_add_rcu(&data->list, &file->triggers); |
| 559 | ret++; |
| 560 | |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 561 | update_cond_flag(file); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 562 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
| 563 | list_del_rcu(&data->list); |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 564 | update_cond_flag(file); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 565 | ret--; |
| 566 | } |
| 567 | out: |
| 568 | return ret; |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * unregister_trigger - Generic event_command @unreg implementation |
| 573 | * @glob: The raw string used to register the trigger |
| 574 | * @ops: The trigger ops associated with the trigger |
| 575 | * @test: Trigger-specific data used to find the trigger to remove |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 576 | * @file: The trace_event_file associated with the event |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 577 | * |
| 578 | * Common implementation for event trigger unregistration. |
| 579 | * |
| 580 | * Usually used directly as the @unreg method in event command |
| 581 | * implementations. |
| 582 | */ |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 583 | void unregister_trigger(char *glob, struct event_trigger_ops *ops, |
| 584 | struct event_trigger_data *test, |
| 585 | struct trace_event_file *file) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 586 | { |
| 587 | struct event_trigger_data *data; |
| 588 | bool unregistered = false; |
| 589 | |
| 590 | list_for_each_entry_rcu(data, &file->triggers, list) { |
| 591 | if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) { |
| 592 | unregistered = true; |
| 593 | list_del_rcu(&data->list); |
| 594 | trace_event_trigger_enable_disable(file, 0); |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 595 | update_cond_flag(file); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 596 | break; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | if (unregistered && data->ops->free) |
| 601 | data->ops->free(data->ops, data); |
| 602 | } |
| 603 | |
| 604 | /** |
| 605 | * event_trigger_callback - Generic event_command @func implementation |
| 606 | * @cmd_ops: The command ops, used for trigger registration |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 607 | * @file: The trace_event_file associated with the event |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 608 | * @glob: The raw string used to register the trigger |
| 609 | * @cmd: The cmd portion of the string used to register the trigger |
| 610 | * @param: The params portion of the string used to register the trigger |
| 611 | * |
| 612 | * Common implementation for event command parsing and trigger |
| 613 | * instantiation. |
| 614 | * |
| 615 | * Usually used directly as the @func method in event command |
| 616 | * implementations. |
| 617 | * |
| 618 | * Return: 0 on success, errno otherwise |
| 619 | */ |
| 620 | static int |
| 621 | event_trigger_callback(struct event_command *cmd_ops, |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 622 | struct trace_event_file *file, |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 623 | char *glob, char *cmd, char *param) |
| 624 | { |
| 625 | struct event_trigger_data *trigger_data; |
| 626 | struct event_trigger_ops *trigger_ops; |
| 627 | char *trigger = NULL; |
| 628 | char *number; |
| 629 | int ret; |
| 630 | |
| 631 | /* separate the trigger from the filter (t:n [if filter]) */ |
| 632 | if (param && isdigit(param[0])) |
| 633 | trigger = strsep(¶m, " \t"); |
| 634 | |
| 635 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); |
| 636 | |
| 637 | ret = -ENOMEM; |
| 638 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); |
| 639 | if (!trigger_data) |
| 640 | goto out; |
| 641 | |
| 642 | trigger_data->count = -1; |
| 643 | trigger_data->ops = trigger_ops; |
| 644 | trigger_data->cmd_ops = cmd_ops; |
| 645 | INIT_LIST_HEAD(&trigger_data->list); |
Tom Zanussi | db1388b | 2016-03-03 12:54:58 -0600 | [diff] [blame] | 646 | INIT_LIST_HEAD(&trigger_data->named_list); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 647 | |
| 648 | if (glob[0] == '!') { |
| 649 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); |
| 650 | kfree(trigger_data); |
| 651 | ret = 0; |
| 652 | goto out; |
| 653 | } |
| 654 | |
| 655 | if (trigger) { |
| 656 | number = strsep(&trigger, ":"); |
| 657 | |
| 658 | ret = -EINVAL; |
| 659 | if (!strlen(number)) |
| 660 | goto out_free; |
| 661 | |
| 662 | /* |
| 663 | * We use the callback data field (which is a pointer) |
| 664 | * as our counter. |
| 665 | */ |
| 666 | ret = kstrtoul(number, 0, &trigger_data->count); |
| 667 | if (ret) |
| 668 | goto out_free; |
| 669 | } |
| 670 | |
| 671 | if (!param) /* if param is non-empty, it's supposed to be a filter */ |
| 672 | goto out_reg; |
| 673 | |
| 674 | if (!cmd_ops->set_filter) |
| 675 | goto out_reg; |
| 676 | |
| 677 | ret = cmd_ops->set_filter(param, trigger_data, file); |
| 678 | if (ret < 0) |
| 679 | goto out_free; |
| 680 | |
| 681 | out_reg: |
Steven Rostedt (VMware) | 2a0ce1f | 2018-07-24 19:13:31 -0400 | [diff] [blame] | 682 | /* Up the trigger_data count to make sure reg doesn't free it on failure */ |
| 683 | event_trigger_init(trigger_ops, trigger_data); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 684 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
| 685 | /* |
| 686 | * The above returns on success the # of functions enabled, |
| 687 | * but if it didn't find any functions it returns zero. |
| 688 | * Consider no functions a failure too. |
| 689 | */ |
| 690 | if (!ret) { |
Steven Rostedt (VMware) | 2a0ce1f | 2018-07-24 19:13:31 -0400 | [diff] [blame] | 691 | cmd_ops->unreg(glob, trigger_ops, trigger_data, file); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 692 | ret = -ENOENT; |
Steven Rostedt (VMware) | 2a0ce1f | 2018-07-24 19:13:31 -0400 | [diff] [blame] | 693 | } else if (ret > 0) |
| 694 | ret = 0; |
| 695 | |
| 696 | /* Down the counter of trigger_data or free it if not used anymore */ |
| 697 | event_trigger_free(trigger_ops, trigger_data); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 698 | out: |
| 699 | return ret; |
| 700 | |
| 701 | out_free: |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 702 | if (cmd_ops->set_filter) |
| 703 | cmd_ops->set_filter(NULL, trigger_data, NULL); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 704 | kfree(trigger_data); |
| 705 | goto out; |
| 706 | } |
| 707 | |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 708 | /** |
| 709 | * set_trigger_filter - Generic event_command @set_filter implementation |
| 710 | * @filter_str: The filter string for the trigger, NULL to remove filter |
| 711 | * @trigger_data: Trigger-specific data |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 712 | * @file: The trace_event_file associated with the event |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 713 | * |
| 714 | * Common implementation for event command filter parsing and filter |
| 715 | * instantiation. |
| 716 | * |
| 717 | * Usually used directly as the @set_filter method in event command |
| 718 | * implementations. |
| 719 | * |
| 720 | * Also used to remove a filter (if filter_str = NULL). |
| 721 | * |
| 722 | * Return: 0 on success, errno otherwise |
| 723 | */ |
Tom Zanussi | ab4bf00 | 2015-12-10 12:50:44 -0600 | [diff] [blame] | 724 | int set_trigger_filter(char *filter_str, |
| 725 | struct event_trigger_data *trigger_data, |
| 726 | struct trace_event_file *file) |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 727 | { |
| 728 | struct event_trigger_data *data = trigger_data; |
| 729 | struct event_filter *filter = NULL, *tmp; |
| 730 | int ret = -EINVAL; |
| 731 | char *s; |
| 732 | |
| 733 | if (!filter_str) /* clear the current filter */ |
| 734 | goto assign; |
| 735 | |
| 736 | s = strsep(&filter_str, " \t"); |
| 737 | |
| 738 | if (!strlen(s) || strcmp(s, "if") != 0) |
| 739 | goto out; |
| 740 | |
| 741 | if (!filter_str) |
| 742 | goto out; |
| 743 | |
| 744 | /* The filter is for the 'trigger' event, not the triggered event */ |
| 745 | ret = create_event_filter(file->event_call, filter_str, false, &filter); |
Steven Rostedt (VMware) | 5e8e777 | 2018-12-09 21:17:30 -0500 | [diff] [blame] | 746 | /* |
| 747 | * If create_event_filter() fails, filter still needs to be freed. |
| 748 | * Which the calling code will do with data->filter. |
| 749 | */ |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 750 | assign: |
Steven Rostedt (Red Hat) | d8a30f2 | 2013-12-21 21:55:17 -0500 | [diff] [blame] | 751 | tmp = rcu_access_pointer(data->filter); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 752 | |
| 753 | rcu_assign_pointer(data->filter, filter); |
| 754 | |
| 755 | if (tmp) { |
| 756 | /* Make sure the call is done with the filter */ |
| 757 | synchronize_sched(); |
| 758 | free_event_filter(tmp); |
| 759 | } |
| 760 | |
| 761 | kfree(data->filter_str); |
| 762 | data->filter_str = NULL; |
| 763 | |
| 764 | if (filter_str) { |
| 765 | data->filter_str = kstrdup(filter_str, GFP_KERNEL); |
| 766 | if (!data->filter_str) { |
Steven Rostedt (Red Hat) | d8a30f2 | 2013-12-21 21:55:17 -0500 | [diff] [blame] | 767 | free_event_filter(rcu_access_pointer(data->filter)); |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 768 | data->filter = NULL; |
| 769 | ret = -ENOMEM; |
| 770 | } |
| 771 | } |
| 772 | out: |
| 773 | return ret; |
| 774 | } |
| 775 | |
Tom Zanussi | db1388b | 2016-03-03 12:54:58 -0600 | [diff] [blame] | 776 | static LIST_HEAD(named_triggers); |
| 777 | |
| 778 | /** |
| 779 | * find_named_trigger - Find the common named trigger associated with @name |
| 780 | * @name: The name of the set of named triggers to find the common data for |
| 781 | * |
| 782 | * Named triggers are sets of triggers that share a common set of |
| 783 | * trigger data. The first named trigger registered with a given name |
| 784 | * owns the common trigger data that the others subsequently |
| 785 | * registered with the same name will reference. This function |
| 786 | * returns the common trigger data associated with that first |
| 787 | * registered instance. |
| 788 | * |
| 789 | * Return: the common trigger data for the given named trigger on |
| 790 | * success, NULL otherwise. |
| 791 | */ |
| 792 | struct event_trigger_data *find_named_trigger(const char *name) |
| 793 | { |
| 794 | struct event_trigger_data *data; |
| 795 | |
| 796 | if (!name) |
| 797 | return NULL; |
| 798 | |
| 799 | list_for_each_entry(data, &named_triggers, named_list) { |
| 800 | if (data->named_data) |
| 801 | continue; |
| 802 | if (strcmp(data->name, name) == 0) |
| 803 | return data; |
| 804 | } |
| 805 | |
| 806 | return NULL; |
| 807 | } |
| 808 | |
| 809 | /** |
| 810 | * is_named_trigger - determine if a given trigger is a named trigger |
| 811 | * @test: The trigger data to test |
| 812 | * |
| 813 | * Return: true if 'test' is a named trigger, false otherwise. |
| 814 | */ |
| 815 | bool is_named_trigger(struct event_trigger_data *test) |
| 816 | { |
| 817 | struct event_trigger_data *data; |
| 818 | |
| 819 | list_for_each_entry(data, &named_triggers, named_list) { |
| 820 | if (test == data) |
| 821 | return true; |
| 822 | } |
| 823 | |
| 824 | return false; |
| 825 | } |
| 826 | |
| 827 | /** |
| 828 | * save_named_trigger - save the trigger in the named trigger list |
| 829 | * @name: The name of the named trigger set |
| 830 | * @data: The trigger data to save |
| 831 | * |
| 832 | * Return: 0 if successful, negative error otherwise. |
| 833 | */ |
| 834 | int save_named_trigger(const char *name, struct event_trigger_data *data) |
| 835 | { |
| 836 | data->name = kstrdup(name, GFP_KERNEL); |
| 837 | if (!data->name) |
| 838 | return -ENOMEM; |
| 839 | |
| 840 | list_add(&data->named_list, &named_triggers); |
| 841 | |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | /** |
| 846 | * del_named_trigger - delete a trigger from the named trigger list |
| 847 | * @data: The trigger data to delete |
| 848 | */ |
| 849 | void del_named_trigger(struct event_trigger_data *data) |
| 850 | { |
| 851 | kfree(data->name); |
| 852 | data->name = NULL; |
| 853 | |
| 854 | list_del(&data->named_list); |
| 855 | } |
| 856 | |
| 857 | static void __pause_named_trigger(struct event_trigger_data *data, bool pause) |
| 858 | { |
| 859 | struct event_trigger_data *test; |
| 860 | |
| 861 | list_for_each_entry(test, &named_triggers, named_list) { |
| 862 | if (strcmp(test->name, data->name) == 0) { |
| 863 | if (pause) { |
| 864 | test->paused_tmp = test->paused; |
| 865 | test->paused = true; |
| 866 | } else { |
| 867 | test->paused = test->paused_tmp; |
| 868 | } |
| 869 | } |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | /** |
| 874 | * pause_named_trigger - Pause all named triggers with the same name |
| 875 | * @data: The trigger data of a named trigger to pause |
| 876 | * |
| 877 | * Pauses a named trigger along with all other triggers having the |
| 878 | * same name. Because named triggers share a common set of data, |
| 879 | * pausing only one is meaningless, so pausing one named trigger needs |
| 880 | * to pause all triggers with the same name. |
| 881 | */ |
| 882 | void pause_named_trigger(struct event_trigger_data *data) |
| 883 | { |
| 884 | __pause_named_trigger(data, true); |
| 885 | } |
| 886 | |
| 887 | /** |
| 888 | * unpause_named_trigger - Un-pause all named triggers with the same name |
| 889 | * @data: The trigger data of a named trigger to unpause |
| 890 | * |
| 891 | * Un-pauses a named trigger along with all other triggers having the |
| 892 | * same name. Because named triggers share a common set of data, |
| 893 | * unpausing only one is meaningless, so unpausing one named trigger |
| 894 | * needs to unpause all triggers with the same name. |
| 895 | */ |
| 896 | void unpause_named_trigger(struct event_trigger_data *data) |
| 897 | { |
| 898 | __pause_named_trigger(data, false); |
| 899 | } |
| 900 | |
| 901 | /** |
| 902 | * set_named_trigger_data - Associate common named trigger data |
| 903 | * @data: The trigger data of a named trigger to unpause |
| 904 | * |
| 905 | * Named triggers are sets of triggers that share a common set of |
| 906 | * trigger data. The first named trigger registered with a given name |
| 907 | * owns the common trigger data that the others subsequently |
| 908 | * registered with the same name will reference. This function |
| 909 | * associates the common trigger data from the first trigger with the |
| 910 | * given trigger. |
| 911 | */ |
| 912 | void set_named_trigger_data(struct event_trigger_data *data, |
| 913 | struct event_trigger_data *named_data) |
| 914 | { |
| 915 | data->named_data = named_data; |
| 916 | } |
| 917 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 918 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 919 | traceon_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 920 | { |
| 921 | if (tracing_is_on()) |
| 922 | return; |
| 923 | |
| 924 | tracing_on(); |
| 925 | } |
| 926 | |
| 927 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 928 | traceon_count_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 929 | { |
Steven Rostedt (Red Hat) | e8dc637 | 2014-01-06 22:25:50 -0500 | [diff] [blame] | 930 | if (tracing_is_on()) |
| 931 | return; |
| 932 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 933 | if (!data->count) |
| 934 | return; |
| 935 | |
| 936 | if (data->count != -1) |
| 937 | (data->count)--; |
| 938 | |
Steven Rostedt (Red Hat) | e8dc637 | 2014-01-06 22:25:50 -0500 | [diff] [blame] | 939 | tracing_on(); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 943 | traceoff_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 944 | { |
| 945 | if (!tracing_is_on()) |
| 946 | return; |
| 947 | |
| 948 | tracing_off(); |
| 949 | } |
| 950 | |
| 951 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 952 | traceoff_count_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 953 | { |
Steven Rostedt (Red Hat) | e8dc637 | 2014-01-06 22:25:50 -0500 | [diff] [blame] | 954 | if (!tracing_is_on()) |
| 955 | return; |
| 956 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 957 | if (!data->count) |
| 958 | return; |
| 959 | |
| 960 | if (data->count != -1) |
| 961 | (data->count)--; |
| 962 | |
Steven Rostedt (Red Hat) | e8dc637 | 2014-01-06 22:25:50 -0500 | [diff] [blame] | 963 | tracing_off(); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | static int |
| 967 | traceon_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, |
| 968 | struct event_trigger_data *data) |
| 969 | { |
| 970 | return event_trigger_print("traceon", m, (void *)data->count, |
| 971 | data->filter_str); |
| 972 | } |
| 973 | |
| 974 | static int |
| 975 | traceoff_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, |
| 976 | struct event_trigger_data *data) |
| 977 | { |
| 978 | return event_trigger_print("traceoff", m, (void *)data->count, |
| 979 | data->filter_str); |
| 980 | } |
| 981 | |
| 982 | static struct event_trigger_ops traceon_trigger_ops = { |
| 983 | .func = traceon_trigger, |
| 984 | .print = traceon_trigger_print, |
| 985 | .init = event_trigger_init, |
| 986 | .free = event_trigger_free, |
| 987 | }; |
| 988 | |
| 989 | static struct event_trigger_ops traceon_count_trigger_ops = { |
| 990 | .func = traceon_count_trigger, |
| 991 | .print = traceon_trigger_print, |
| 992 | .init = event_trigger_init, |
| 993 | .free = event_trigger_free, |
| 994 | }; |
| 995 | |
| 996 | static struct event_trigger_ops traceoff_trigger_ops = { |
| 997 | .func = traceoff_trigger, |
| 998 | .print = traceoff_trigger_print, |
| 999 | .init = event_trigger_init, |
| 1000 | .free = event_trigger_free, |
| 1001 | }; |
| 1002 | |
| 1003 | static struct event_trigger_ops traceoff_count_trigger_ops = { |
| 1004 | .func = traceoff_count_trigger, |
| 1005 | .print = traceoff_trigger_print, |
| 1006 | .init = event_trigger_init, |
| 1007 | .free = event_trigger_free, |
| 1008 | }; |
| 1009 | |
| 1010 | static struct event_trigger_ops * |
| 1011 | onoff_get_trigger_ops(char *cmd, char *param) |
| 1012 | { |
| 1013 | struct event_trigger_ops *ops; |
| 1014 | |
| 1015 | /* we register both traceon and traceoff to this callback */ |
| 1016 | if (strcmp(cmd, "traceon") == 0) |
| 1017 | ops = param ? &traceon_count_trigger_ops : |
| 1018 | &traceon_trigger_ops; |
| 1019 | else |
| 1020 | ops = param ? &traceoff_count_trigger_ops : |
| 1021 | &traceoff_trigger_ops; |
| 1022 | |
| 1023 | return ops; |
| 1024 | } |
| 1025 | |
| 1026 | static struct event_command trigger_traceon_cmd = { |
| 1027 | .name = "traceon", |
| 1028 | .trigger_type = ETT_TRACE_ONOFF, |
| 1029 | .func = event_trigger_callback, |
| 1030 | .reg = register_trigger, |
| 1031 | .unreg = unregister_trigger, |
| 1032 | .get_trigger_ops = onoff_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1033 | .set_filter = set_trigger_filter, |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1034 | }; |
| 1035 | |
| 1036 | static struct event_command trigger_traceoff_cmd = { |
| 1037 | .name = "traceoff", |
| 1038 | .trigger_type = ETT_TRACE_ONOFF, |
Masami Hiramatsu | a0d0c62 | 2016-09-09 01:05:45 +0900 | [diff] [blame] | 1039 | .flags = EVENT_CMD_FL_POST_TRIGGER, |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1040 | .func = event_trigger_callback, |
| 1041 | .reg = register_trigger, |
| 1042 | .unreg = unregister_trigger, |
| 1043 | .get_trigger_ops = onoff_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1044 | .set_filter = set_trigger_filter, |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1045 | }; |
| 1046 | |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1047 | #ifdef CONFIG_TRACER_SNAPSHOT |
| 1048 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1049 | snapshot_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1050 | { |
| 1051 | tracing_snapshot(); |
| 1052 | } |
| 1053 | |
| 1054 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1055 | snapshot_count_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1056 | { |
| 1057 | if (!data->count) |
| 1058 | return; |
| 1059 | |
| 1060 | if (data->count != -1) |
| 1061 | (data->count)--; |
| 1062 | |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1063 | snapshot_trigger(data, rec); |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1064 | } |
| 1065 | |
| 1066 | static int |
| 1067 | register_snapshot_trigger(char *glob, struct event_trigger_ops *ops, |
| 1068 | struct event_trigger_data *data, |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1069 | struct trace_event_file *file) |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1070 | { |
| 1071 | int ret = register_trigger(glob, ops, data, file); |
| 1072 | |
| 1073 | if (ret > 0 && tracing_alloc_snapshot() != 0) { |
| 1074 | unregister_trigger(glob, ops, data, file); |
| 1075 | ret = 0; |
| 1076 | } |
| 1077 | |
| 1078 | return ret; |
| 1079 | } |
| 1080 | |
| 1081 | static int |
| 1082 | snapshot_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, |
| 1083 | struct event_trigger_data *data) |
| 1084 | { |
| 1085 | return event_trigger_print("snapshot", m, (void *)data->count, |
| 1086 | data->filter_str); |
| 1087 | } |
| 1088 | |
| 1089 | static struct event_trigger_ops snapshot_trigger_ops = { |
| 1090 | .func = snapshot_trigger, |
| 1091 | .print = snapshot_trigger_print, |
| 1092 | .init = event_trigger_init, |
| 1093 | .free = event_trigger_free, |
| 1094 | }; |
| 1095 | |
| 1096 | static struct event_trigger_ops snapshot_count_trigger_ops = { |
| 1097 | .func = snapshot_count_trigger, |
| 1098 | .print = snapshot_trigger_print, |
| 1099 | .init = event_trigger_init, |
| 1100 | .free = event_trigger_free, |
| 1101 | }; |
| 1102 | |
| 1103 | static struct event_trigger_ops * |
| 1104 | snapshot_get_trigger_ops(char *cmd, char *param) |
| 1105 | { |
| 1106 | return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops; |
| 1107 | } |
| 1108 | |
| 1109 | static struct event_command trigger_snapshot_cmd = { |
| 1110 | .name = "snapshot", |
| 1111 | .trigger_type = ETT_SNAPSHOT, |
| 1112 | .func = event_trigger_callback, |
| 1113 | .reg = register_snapshot_trigger, |
| 1114 | .unreg = unregister_trigger, |
| 1115 | .get_trigger_ops = snapshot_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1116 | .set_filter = set_trigger_filter, |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1117 | }; |
| 1118 | |
| 1119 | static __init int register_trigger_snapshot_cmd(void) |
| 1120 | { |
| 1121 | int ret; |
| 1122 | |
| 1123 | ret = register_event_command(&trigger_snapshot_cmd); |
| 1124 | WARN_ON(ret < 0); |
| 1125 | |
| 1126 | return ret; |
| 1127 | } |
| 1128 | #else |
| 1129 | static __init int register_trigger_snapshot_cmd(void) { return 0; } |
| 1130 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
| 1131 | |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1132 | #ifdef CONFIG_STACKTRACE |
| 1133 | /* |
| 1134 | * Skip 3: |
| 1135 | * stacktrace_trigger() |
| 1136 | * event_triggers_post_call() |
Steven Rostedt (Red Hat) | a723776 | 2015-05-13 15:27:47 -0400 | [diff] [blame] | 1137 | * trace_event_raw_event_xxx() |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1138 | */ |
| 1139 | #define STACK_SKIP 3 |
| 1140 | |
| 1141 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1142 | stacktrace_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1143 | { |
| 1144 | trace_dump_stack(STACK_SKIP); |
| 1145 | } |
| 1146 | |
| 1147 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1148 | stacktrace_count_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1149 | { |
| 1150 | if (!data->count) |
| 1151 | return; |
| 1152 | |
| 1153 | if (data->count != -1) |
| 1154 | (data->count)--; |
| 1155 | |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1156 | stacktrace_trigger(data, rec); |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1157 | } |
| 1158 | |
| 1159 | static int |
| 1160 | stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, |
| 1161 | struct event_trigger_data *data) |
| 1162 | { |
| 1163 | return event_trigger_print("stacktrace", m, (void *)data->count, |
| 1164 | data->filter_str); |
| 1165 | } |
| 1166 | |
| 1167 | static struct event_trigger_ops stacktrace_trigger_ops = { |
| 1168 | .func = stacktrace_trigger, |
| 1169 | .print = stacktrace_trigger_print, |
| 1170 | .init = event_trigger_init, |
| 1171 | .free = event_trigger_free, |
| 1172 | }; |
| 1173 | |
| 1174 | static struct event_trigger_ops stacktrace_count_trigger_ops = { |
| 1175 | .func = stacktrace_count_trigger, |
| 1176 | .print = stacktrace_trigger_print, |
| 1177 | .init = event_trigger_init, |
| 1178 | .free = event_trigger_free, |
| 1179 | }; |
| 1180 | |
| 1181 | static struct event_trigger_ops * |
| 1182 | stacktrace_get_trigger_ops(char *cmd, char *param) |
| 1183 | { |
| 1184 | return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops; |
| 1185 | } |
| 1186 | |
| 1187 | static struct event_command trigger_stacktrace_cmd = { |
| 1188 | .name = "stacktrace", |
| 1189 | .trigger_type = ETT_STACKTRACE, |
Steven Rostedt (Red Hat) | 353206f | 2016-02-22 15:55:09 -0500 | [diff] [blame] | 1190 | .flags = EVENT_CMD_FL_POST_TRIGGER, |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1191 | .func = event_trigger_callback, |
| 1192 | .reg = register_trigger, |
| 1193 | .unreg = unregister_trigger, |
| 1194 | .get_trigger_ops = stacktrace_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1195 | .set_filter = set_trigger_filter, |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1196 | }; |
| 1197 | |
| 1198 | static __init int register_trigger_stacktrace_cmd(void) |
| 1199 | { |
| 1200 | int ret; |
| 1201 | |
| 1202 | ret = register_event_command(&trigger_stacktrace_cmd); |
| 1203 | WARN_ON(ret < 0); |
| 1204 | |
| 1205 | return ret; |
| 1206 | } |
| 1207 | #else |
| 1208 | static __init int register_trigger_stacktrace_cmd(void) { return 0; } |
| 1209 | #endif /* CONFIG_STACKTRACE */ |
| 1210 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1211 | static __init void unregister_trigger_traceon_traceoff_cmds(void) |
| 1212 | { |
| 1213 | unregister_event_command(&trigger_traceon_cmd); |
| 1214 | unregister_event_command(&trigger_traceoff_cmd); |
| 1215 | } |
| 1216 | |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1217 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1218 | event_enable_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1219 | { |
| 1220 | struct enable_trigger_data *enable_data = data->private_data; |
| 1221 | |
| 1222 | if (enable_data->enable) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1223 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1224 | else |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1225 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1226 | } |
| 1227 | |
| 1228 | static void |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1229 | event_enable_count_trigger(struct event_trigger_data *data, void *rec) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1230 | { |
| 1231 | struct enable_trigger_data *enable_data = data->private_data; |
| 1232 | |
| 1233 | if (!data->count) |
| 1234 | return; |
| 1235 | |
| 1236 | /* Skip if the event is in a state we want to switch to */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1237 | if (enable_data->enable == !(enable_data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1238 | return; |
| 1239 | |
| 1240 | if (data->count != -1) |
| 1241 | (data->count)--; |
| 1242 | |
Tom Zanussi | c4a5923 | 2015-12-10 12:50:45 -0600 | [diff] [blame] | 1243 | event_enable_trigger(data, rec); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1244 | } |
| 1245 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1246 | int event_enable_trigger_print(struct seq_file *m, |
| 1247 | struct event_trigger_ops *ops, |
| 1248 | struct event_trigger_data *data) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1249 | { |
| 1250 | struct enable_trigger_data *enable_data = data->private_data; |
| 1251 | |
| 1252 | seq_printf(m, "%s:%s:%s", |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1253 | enable_data->hist ? |
| 1254 | (enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) : |
| 1255 | (enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR), |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1256 | enable_data->file->event_call->class->system, |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 1257 | trace_event_name(enable_data->file->event_call)); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1258 | |
| 1259 | if (data->count == -1) |
| 1260 | seq_puts(m, ":unlimited"); |
| 1261 | else |
| 1262 | seq_printf(m, ":count=%ld", data->count); |
| 1263 | |
| 1264 | if (data->filter_str) |
| 1265 | seq_printf(m, " if %s\n", data->filter_str); |
| 1266 | else |
Rasmus Villemoes | 1177e43 | 2014-11-08 21:42:12 +0100 | [diff] [blame] | 1267 | seq_putc(m, '\n'); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1268 | |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1272 | void event_enable_trigger_free(struct event_trigger_ops *ops, |
| 1273 | struct event_trigger_data *data) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1274 | { |
| 1275 | struct enable_trigger_data *enable_data = data->private_data; |
| 1276 | |
| 1277 | if (WARN_ON_ONCE(data->ref <= 0)) |
| 1278 | return; |
| 1279 | |
| 1280 | data->ref--; |
| 1281 | if (!data->ref) { |
| 1282 | /* Remove the SOFT_MODE flag */ |
| 1283 | trace_event_enable_disable(enable_data->file, 0, 1); |
| 1284 | module_put(enable_data->file->event_call->mod); |
| 1285 | trigger_data_free(data); |
| 1286 | kfree(enable_data); |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | static struct event_trigger_ops event_enable_trigger_ops = { |
| 1291 | .func = event_enable_trigger, |
| 1292 | .print = event_enable_trigger_print, |
| 1293 | .init = event_trigger_init, |
| 1294 | .free = event_enable_trigger_free, |
| 1295 | }; |
| 1296 | |
| 1297 | static struct event_trigger_ops event_enable_count_trigger_ops = { |
| 1298 | .func = event_enable_count_trigger, |
| 1299 | .print = event_enable_trigger_print, |
| 1300 | .init = event_trigger_init, |
| 1301 | .free = event_enable_trigger_free, |
| 1302 | }; |
| 1303 | |
| 1304 | static struct event_trigger_ops event_disable_trigger_ops = { |
| 1305 | .func = event_enable_trigger, |
| 1306 | .print = event_enable_trigger_print, |
| 1307 | .init = event_trigger_init, |
| 1308 | .free = event_enable_trigger_free, |
| 1309 | }; |
| 1310 | |
| 1311 | static struct event_trigger_ops event_disable_count_trigger_ops = { |
| 1312 | .func = event_enable_count_trigger, |
| 1313 | .print = event_enable_trigger_print, |
| 1314 | .init = event_trigger_init, |
| 1315 | .free = event_enable_trigger_free, |
| 1316 | }; |
| 1317 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1318 | int event_enable_trigger_func(struct event_command *cmd_ops, |
| 1319 | struct trace_event_file *file, |
| 1320 | char *glob, char *cmd, char *param) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1321 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1322 | struct trace_event_file *event_enable_file; |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1323 | struct enable_trigger_data *enable_data; |
| 1324 | struct event_trigger_data *trigger_data; |
| 1325 | struct event_trigger_ops *trigger_ops; |
| 1326 | struct trace_array *tr = file->tr; |
| 1327 | const char *system; |
| 1328 | const char *event; |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1329 | bool hist = false; |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1330 | char *trigger; |
| 1331 | char *number; |
| 1332 | bool enable; |
| 1333 | int ret; |
| 1334 | |
| 1335 | if (!param) |
| 1336 | return -EINVAL; |
| 1337 | |
| 1338 | /* separate the trigger from the filter (s:e:n [if filter]) */ |
| 1339 | trigger = strsep(¶m, " \t"); |
| 1340 | if (!trigger) |
| 1341 | return -EINVAL; |
| 1342 | |
| 1343 | system = strsep(&trigger, ":"); |
| 1344 | if (!trigger) |
| 1345 | return -EINVAL; |
| 1346 | |
| 1347 | event = strsep(&trigger, ":"); |
| 1348 | |
| 1349 | ret = -EINVAL; |
| 1350 | event_enable_file = find_event_file(tr, system, event); |
| 1351 | if (!event_enable_file) |
| 1352 | goto out; |
| 1353 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1354 | #ifdef CONFIG_HIST_TRIGGERS |
| 1355 | hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) || |
| 1356 | (strcmp(cmd, DISABLE_HIST_STR) == 0)); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1357 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1358 | enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || |
| 1359 | (strcmp(cmd, ENABLE_HIST_STR) == 0)); |
| 1360 | #else |
| 1361 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
| 1362 | #endif |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1363 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); |
| 1364 | |
| 1365 | ret = -ENOMEM; |
| 1366 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); |
| 1367 | if (!trigger_data) |
| 1368 | goto out; |
| 1369 | |
| 1370 | enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL); |
| 1371 | if (!enable_data) { |
| 1372 | kfree(trigger_data); |
| 1373 | goto out; |
| 1374 | } |
| 1375 | |
| 1376 | trigger_data->count = -1; |
| 1377 | trigger_data->ops = trigger_ops; |
| 1378 | trigger_data->cmd_ops = cmd_ops; |
| 1379 | INIT_LIST_HEAD(&trigger_data->list); |
| 1380 | RCU_INIT_POINTER(trigger_data->filter, NULL); |
| 1381 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1382 | enable_data->hist = hist; |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1383 | enable_data->enable = enable; |
| 1384 | enable_data->file = event_enable_file; |
| 1385 | trigger_data->private_data = enable_data; |
| 1386 | |
| 1387 | if (glob[0] == '!') { |
| 1388 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); |
| 1389 | kfree(trigger_data); |
| 1390 | kfree(enable_data); |
| 1391 | ret = 0; |
| 1392 | goto out; |
| 1393 | } |
| 1394 | |
Steven Rostedt (VMware) | a9737bb | 2018-07-25 16:02:06 -0400 | [diff] [blame] | 1395 | /* Up the trigger_data count to make sure nothing frees it on failure */ |
| 1396 | event_trigger_init(trigger_ops, trigger_data); |
| 1397 | |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1398 | if (trigger) { |
| 1399 | number = strsep(&trigger, ":"); |
| 1400 | |
| 1401 | ret = -EINVAL; |
| 1402 | if (!strlen(number)) |
| 1403 | goto out_free; |
| 1404 | |
| 1405 | /* |
| 1406 | * We use the callback data field (which is a pointer) |
| 1407 | * as our counter. |
| 1408 | */ |
| 1409 | ret = kstrtoul(number, 0, &trigger_data->count); |
| 1410 | if (ret) |
| 1411 | goto out_free; |
| 1412 | } |
| 1413 | |
| 1414 | if (!param) /* if param is non-empty, it's supposed to be a filter */ |
| 1415 | goto out_reg; |
| 1416 | |
| 1417 | if (!cmd_ops->set_filter) |
| 1418 | goto out_reg; |
| 1419 | |
| 1420 | ret = cmd_ops->set_filter(param, trigger_data, file); |
| 1421 | if (ret < 0) |
| 1422 | goto out_free; |
| 1423 | |
| 1424 | out_reg: |
| 1425 | /* Don't let event modules unload while probe registered */ |
| 1426 | ret = try_module_get(event_enable_file->event_call->mod); |
| 1427 | if (!ret) { |
| 1428 | ret = -EBUSY; |
| 1429 | goto out_free; |
| 1430 | } |
| 1431 | |
| 1432 | ret = trace_event_enable_disable(event_enable_file, 1, 1); |
| 1433 | if (ret < 0) |
| 1434 | goto out_put; |
| 1435 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
| 1436 | /* |
| 1437 | * The above returns on success the # of functions enabled, |
| 1438 | * but if it didn't find any functions it returns zero. |
| 1439 | * Consider no functions a failure too. |
| 1440 | */ |
| 1441 | if (!ret) { |
| 1442 | ret = -ENOENT; |
| 1443 | goto out_disable; |
| 1444 | } else if (ret < 0) |
| 1445 | goto out_disable; |
| 1446 | /* Just return zero, not the number of enabled functions */ |
| 1447 | ret = 0; |
Steven Rostedt (VMware) | a9737bb | 2018-07-25 16:02:06 -0400 | [diff] [blame] | 1448 | event_trigger_free(trigger_ops, trigger_data); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1449 | out: |
| 1450 | return ret; |
| 1451 | |
| 1452 | out_disable: |
| 1453 | trace_event_enable_disable(event_enable_file, 0, 1); |
| 1454 | out_put: |
| 1455 | module_put(event_enable_file->event_call->mod); |
| 1456 | out_free: |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1457 | if (cmd_ops->set_filter) |
| 1458 | cmd_ops->set_filter(NULL, trigger_data, NULL); |
Steven Rostedt (VMware) | a9737bb | 2018-07-25 16:02:06 -0400 | [diff] [blame] | 1459 | event_trigger_free(trigger_ops, trigger_data); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1460 | kfree(enable_data); |
| 1461 | goto out; |
| 1462 | } |
| 1463 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1464 | int event_enable_register_trigger(char *glob, |
| 1465 | struct event_trigger_ops *ops, |
| 1466 | struct event_trigger_data *data, |
| 1467 | struct trace_event_file *file) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1468 | { |
| 1469 | struct enable_trigger_data *enable_data = data->private_data; |
| 1470 | struct enable_trigger_data *test_enable_data; |
| 1471 | struct event_trigger_data *test; |
| 1472 | int ret = 0; |
| 1473 | |
| 1474 | list_for_each_entry_rcu(test, &file->triggers, list) { |
| 1475 | test_enable_data = test->private_data; |
| 1476 | if (test_enable_data && |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1477 | (test->cmd_ops->trigger_type == |
| 1478 | data->cmd_ops->trigger_type) && |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1479 | (test_enable_data->file == enable_data->file)) { |
| 1480 | ret = -EEXIST; |
| 1481 | goto out; |
| 1482 | } |
| 1483 | } |
| 1484 | |
| 1485 | if (data->ops->init) { |
| 1486 | ret = data->ops->init(data->ops, data); |
| 1487 | if (ret < 0) |
| 1488 | goto out; |
| 1489 | } |
| 1490 | |
| 1491 | list_add_rcu(&data->list, &file->triggers); |
| 1492 | ret++; |
| 1493 | |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 1494 | update_cond_flag(file); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1495 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
| 1496 | list_del_rcu(&data->list); |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 1497 | update_cond_flag(file); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1498 | ret--; |
| 1499 | } |
| 1500 | out: |
| 1501 | return ret; |
| 1502 | } |
| 1503 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1504 | void event_enable_unregister_trigger(char *glob, |
| 1505 | struct event_trigger_ops *ops, |
| 1506 | struct event_trigger_data *test, |
| 1507 | struct trace_event_file *file) |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1508 | { |
| 1509 | struct enable_trigger_data *test_enable_data = test->private_data; |
| 1510 | struct enable_trigger_data *enable_data; |
| 1511 | struct event_trigger_data *data; |
| 1512 | bool unregistered = false; |
| 1513 | |
| 1514 | list_for_each_entry_rcu(data, &file->triggers, list) { |
| 1515 | enable_data = data->private_data; |
| 1516 | if (enable_data && |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1517 | (data->cmd_ops->trigger_type == |
| 1518 | test->cmd_ops->trigger_type) && |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1519 | (enable_data->file == test_enable_data->file)) { |
| 1520 | unregistered = true; |
| 1521 | list_del_rcu(&data->list); |
| 1522 | trace_event_trigger_enable_disable(file, 0); |
Tom Zanussi | 4e4a4d7 | 2015-11-23 13:51:16 -0600 | [diff] [blame] | 1523 | update_cond_flag(file); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1524 | break; |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | if (unregistered && data->ops->free) |
| 1529 | data->ops->free(data->ops, data); |
| 1530 | } |
| 1531 | |
| 1532 | static struct event_trigger_ops * |
| 1533 | event_enable_get_trigger_ops(char *cmd, char *param) |
| 1534 | { |
| 1535 | struct event_trigger_ops *ops; |
| 1536 | bool enable; |
| 1537 | |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1538 | #ifdef CONFIG_HIST_TRIGGERS |
| 1539 | enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || |
| 1540 | (strcmp(cmd, ENABLE_HIST_STR) == 0)); |
| 1541 | #else |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1542 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1543 | #endif |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1544 | if (enable) |
| 1545 | ops = param ? &event_enable_count_trigger_ops : |
| 1546 | &event_enable_trigger_ops; |
| 1547 | else |
| 1548 | ops = param ? &event_disable_count_trigger_ops : |
| 1549 | &event_disable_trigger_ops; |
| 1550 | |
| 1551 | return ops; |
| 1552 | } |
| 1553 | |
| 1554 | static struct event_command trigger_enable_cmd = { |
| 1555 | .name = ENABLE_EVENT_STR, |
| 1556 | .trigger_type = ETT_EVENT_ENABLE, |
| 1557 | .func = event_enable_trigger_func, |
| 1558 | .reg = event_enable_register_trigger, |
| 1559 | .unreg = event_enable_unregister_trigger, |
| 1560 | .get_trigger_ops = event_enable_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1561 | .set_filter = set_trigger_filter, |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1562 | }; |
| 1563 | |
| 1564 | static struct event_command trigger_disable_cmd = { |
| 1565 | .name = DISABLE_EVENT_STR, |
| 1566 | .trigger_type = ETT_EVENT_ENABLE, |
| 1567 | .func = event_enable_trigger_func, |
| 1568 | .reg = event_enable_register_trigger, |
| 1569 | .unreg = event_enable_unregister_trigger, |
| 1570 | .get_trigger_ops = event_enable_get_trigger_ops, |
Tom Zanussi | bac5fb9 | 2013-10-24 08:59:29 -0500 | [diff] [blame] | 1571 | .set_filter = set_trigger_filter, |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1572 | }; |
| 1573 | |
| 1574 | static __init void unregister_trigger_enable_disable_cmds(void) |
| 1575 | { |
| 1576 | unregister_event_command(&trigger_enable_cmd); |
| 1577 | unregister_event_command(&trigger_disable_cmd); |
| 1578 | } |
| 1579 | |
| 1580 | static __init int register_trigger_enable_disable_cmds(void) |
| 1581 | { |
| 1582 | int ret; |
| 1583 | |
| 1584 | ret = register_event_command(&trigger_enable_cmd); |
| 1585 | if (WARN_ON(ret < 0)) |
| 1586 | return ret; |
| 1587 | ret = register_event_command(&trigger_disable_cmd); |
| 1588 | if (WARN_ON(ret < 0)) |
| 1589 | unregister_trigger_enable_disable_cmds(); |
| 1590 | |
| 1591 | return ret; |
| 1592 | } |
| 1593 | |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1594 | static __init int register_trigger_traceon_traceoff_cmds(void) |
| 1595 | { |
| 1596 | int ret; |
| 1597 | |
| 1598 | ret = register_event_command(&trigger_traceon_cmd); |
| 1599 | if (WARN_ON(ret < 0)) |
| 1600 | return ret; |
| 1601 | ret = register_event_command(&trigger_traceoff_cmd); |
| 1602 | if (WARN_ON(ret < 0)) |
| 1603 | unregister_trigger_traceon_traceoff_cmds(); |
| 1604 | |
| 1605 | return ret; |
| 1606 | } |
| 1607 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 1608 | __init int register_trigger_cmds(void) |
| 1609 | { |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1610 | register_trigger_traceon_traceoff_cmds(); |
Tom Zanussi | 93e31ff | 2013-10-24 08:59:26 -0500 | [diff] [blame] | 1611 | register_trigger_snapshot_cmd(); |
Tom Zanussi | f21ecbb | 2013-10-24 08:59:27 -0500 | [diff] [blame] | 1612 | register_trigger_stacktrace_cmd(); |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1613 | register_trigger_enable_disable_cmds(); |
Tom Zanussi | d0bad49 | 2016-03-03 12:54:55 -0600 | [diff] [blame] | 1614 | register_trigger_hist_enable_disable_cmds(); |
Tom Zanussi | 7ef224d | 2016-03-03 12:54:42 -0600 | [diff] [blame] | 1615 | register_trigger_hist_cmd(); |
Tom Zanussi | 2a2df32 | 2013-10-24 08:59:25 -0500 | [diff] [blame] | 1616 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 1617 | return 0; |
| 1618 | } |