cregit-Linux how code gets into the kernel

Release 4.15 kernel/trace/trace_events_trigger.c

Directory: kernel/trace
/*
 * trace_events_trigger - trace event triggers
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com>
 */

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/rculist.h>

#include "trace.h"

static LIST_HEAD(trigger_commands);
static DEFINE_MUTEX(trigger_cmd_mutex);


void trigger_data_free(struct event_trigger_data *data) { if (data->cmd_ops->set_filter) data->cmd_ops->set_filter(NULL, data, NULL); synchronize_sched(); /* make sure current triggers exit before free */ kfree(data); }

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/** * event_triggers_call - Call triggers associated with a trace event * @file: The trace_event_file associated with the event * @rec: The trace entry for the event, NULL for unconditional invocation * * For each trigger associated with an event, invoke the trigger * function registered with the associated trigger command. If rec is * non-NULL, it means that the trigger requires further processing and * shouldn't be unconditionally invoked. If rec is non-NULL and the * trigger has a filter associated with it, rec will checked against * the filter and if the record matches the trigger will be invoked. * If the trigger is a 'post_trigger', meaning it shouldn't be invoked * in any case until the current event is written, the trigger * function isn't invoked but the bit associated with the deferred * trigger is set in the return value. * * Returns an enum event_trigger_type value containing a set bit for * any trigger that should be deferred, ETT_NONE if nothing to defer. * * Called from tracepoint handlers (with rcu_read_lock_sched() held). * * Return: an enum event_trigger_type value containing a set bit for * any trigger that should be deferred, ETT_NONE if nothing to defer. */
enum event_trigger_type event_triggers_call(struct trace_event_file *file, void *rec) { struct event_trigger_data *data; enum event_trigger_type tt = ETT_NONE; struct event_filter *filter; if (list_empty(&file->triggers)) return tt; list_for_each_entry_rcu(data, &file->triggers, list) { if (data->paused) continue; if (!rec) { data->ops->func(data, rec); continue; } filter = rcu_dereference_sched(data->filter); if (filter && !filter_match_preds(filter, rec)) continue; if (event_command_post_trigger(data->cmd_ops)) { tt |= data->cmd_ops->trigger_type; continue; } data->ops->func(data, rec); } return tt; }

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EXPORT_SYMBOL_GPL(event_triggers_call); /** * event_triggers_post_call - Call 'post_triggers' for a trace event * @file: The trace_event_file associated with the event * @tt: enum event_trigger_type containing a set bit for each trigger to invoke * @rec: The trace entry for the event * * For each trigger associated with an event, invoke the trigger * function registered with the associated trigger command, if the * corresponding bit is set in the tt enum passed into this function. * See @event_triggers_call for details on how those bits are set. * * Called from tracepoint handlers (with rcu_read_lock_sched() held). */
void event_triggers_post_call(struct trace_event_file *file, enum event_trigger_type tt, void *rec) { struct event_trigger_data *data; list_for_each_entry_rcu(data, &file->triggers, list) { if (data->paused) continue; if (data->cmd_ops->trigger_type & tt) data->ops->func(data, rec); } }

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EXPORT_SYMBOL_GPL(event_triggers_post_call); #define SHOW_AVAILABLE_TRIGGERS (void *)(1UL)
static void *trigger_next(struct seq_file *m, void *t, loff_t *pos) { struct trace_event_file *event_file = event_file_data(m->private); if (t == SHOW_AVAILABLE_TRIGGERS) return NULL; return seq_list_next(t, &event_file->triggers, pos); }

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static void *trigger_start(struct seq_file *m, loff_t *pos) { struct trace_event_file *event_file; /* ->stop() is called even if ->start() fails */ mutex_lock(&event_mutex); event_file = event_file_data(m->private); if (unlikely(!event_file)) return ERR_PTR(-ENODEV); if (list_empty(&event_file->triggers)) return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL; return seq_list_start(&event_file->triggers, *pos); }

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static void trigger_stop(struct seq_file *m, void *t) { mutex_unlock(&event_mutex); }

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static int trigger_show(struct seq_file *m, void *v) { struct event_trigger_data *data; struct event_command *p; if (v == SHOW_AVAILABLE_TRIGGERS) { seq_puts(m, "# Available triggers:\n"); seq_putc(m, '#'); mutex_lock(&trigger_cmd_mutex); list_for_each_entry_reverse(p, &trigger_commands, list) seq_printf(m, " %s", p->name); seq_putc(m, '\n'); mutex_unlock(&trigger_cmd_mutex); return 0; } data = list_entry(v, struct event_trigger_data, list); data->ops->print(m, data->ops, data); return 0; }

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static const struct seq_operations event_triggers_seq_ops = { .start = trigger_start, .next = trigger_next, .stop = trigger_stop, .show = trigger_show, };
static int event_trigger_regex_open(struct inode *inode, struct file *file) { int ret = 0; mutex_lock(&event_mutex); if (unlikely(!event_file_data(file))) { mutex_unlock(&event_mutex); return -ENODEV; } if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { struct trace_event_file *event_file; struct event_command *p; event_file = event_file_data(file); list_for_each_entry(p, &trigger_commands, list) { if (p->unreg_all) p->unreg_all(event_file); } } if (file->f_mode & FMODE_READ) { ret = seq_open(file, &event_triggers_seq_ops); if (!ret) { struct seq_file *m = file->private_data; m->private = file; } } mutex_unlock(&event_mutex); return ret; }

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static int trigger_process_regex(struct trace_event_file *file, char *buff) { char *command, *next = buff; struct event_command *p; int ret = -EINVAL; command = strsep(&next, ": \t"); command = (command[0] != '!') ? command : command + 1; mutex_lock(&trigger_cmd_mutex); list_for_each_entry(p, &trigger_commands, list) { if (strcmp(p->name, command) == 0) { ret = p->func(p, file, buff, command, next); goto out_unlock; } } out_unlock: mutex_unlock(&trigger_cmd_mutex); return ret; }

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static ssize_t event_trigger_regex_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_event_file *event_file; ssize_t ret; char *buf; if (!cnt) return 0; if (cnt >= PAGE_SIZE) return -EINVAL; buf = memdup_user_nul(ubuf, cnt); if (IS_ERR(buf)) return PTR_ERR(buf); strim(buf); mutex_lock(&event_mutex); event_file = event_file_data(file); if (unlikely(!event_file)) { mutex_unlock(&event_mutex); kfree(buf); return -ENODEV; } ret = trigger_process_regex(event_file, buf); mutex_unlock(&event_mutex); kfree(buf); if (ret < 0) goto out; *ppos += cnt; ret = cnt; out: return ret; }

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static int event_trigger_regex_release(struct inode *inode, struct file *file) { mutex_lock(&event_mutex); if (file->f_mode & FMODE_READ) seq_release(inode, file); mutex_unlock(&event_mutex); return 0; }

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static ssize_t event_trigger_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { return event_trigger_regex_write(filp, ubuf, cnt, ppos); }

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static int event_trigger_open(struct inode *inode, struct file *filp) { return event_trigger_regex_open(inode, filp); }

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static int event_trigger_release(struct inode *inode, struct file *file) { return event_trigger_regex_release(inode, file); }

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const struct file_operations event_trigger_fops = { .open = event_trigger_open, .read = seq_read, .write = event_trigger_write, .llseek = tracing_lseek, .release = event_trigger_release, }; /* * Currently we only register event commands from __init, so mark this * __init too. */
__init int register_event_command(struct event_command *cmd) { struct event_command *p; int ret = 0; mutex_lock(&trigger_cmd_mutex); list_for_each_entry(p, &trigger_commands, list) { if (strcmp(cmd->name, p->name) == 0) { ret = -EBUSY; goto out_unlock; } } list_add(&cmd->list, &trigger_commands); out_unlock: mutex_unlock(&trigger_cmd_mutex); return ret; }

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/* * Currently we only unregister event commands from __init, so mark * this __init too. */
__init int unregister_event_command(struct event_command *cmd) { struct event_command *p, *n; int ret = -ENODEV; mutex_lock(&trigger_cmd_mutex); list_for_each_entry_safe(p, n, &trigger_commands, list) { if (strcmp(cmd->name, p->name) == 0) { ret = 0; list_del_init(&p->list); goto out_unlock; } } out_unlock: mutex_unlock(&trigger_cmd_mutex); return ret; }

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/** * event_trigger_print - Generic event_trigger_ops @print implementation * @name: The name of the event trigger * @m: The seq_file being printed to * @data: Trigger-specific data * @filter_str: filter_str to print, if present * * Common implementation for event triggers to print themselves. * * Usually wrapped by a function that simply sets the @name of the * trigger command and then invokes this. * * Return: 0 on success, errno otherwise */
static int event_trigger_print(const char *name, struct seq_file *m, void *data, char *filter_str) { long count = (long)data; seq_puts(m, name); if (count == -1) seq_puts(m, ":unlimited"); else seq_printf(m, ":count=%ld", count); if (filter_str) seq_printf(m, " if %s\n", filter_str); else seq_putc(m, '\n'); return 0; }

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/** * event_trigger_init - Generic event_trigger_ops @init implementation * @ops: The trigger ops associated with the trigger * @data: Trigger-specific data * * Common implementation of event trigger initialization. * * Usually used directly as the @init method in event trigger * implementations. * * Return: 0 on success, errno otherwise */
int event_trigger_init(struct event_trigger_ops *ops, struct event_trigger_data *data) { data->ref++; return 0; }

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/** * event_trigger_free - Generic event_trigger_ops @free implementation * @ops: The trigger ops associated with the trigger * @data: Trigger-specific data * * Common implementation of event trigger de-initialization. * * Usually used directly as the @free method in event trigger * implementations. */
static void event_trigger_free(struct event_trigger_ops *ops, struct event_trigger_data *data) { if (WARN_ON_ONCE(data->ref <= 0)) return; data->ref--; if (!data->ref) trigger_data_free(data); }

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int trace_event_trigger_enable_disable(struct trace_event_file *file, int trigger_enable) { int ret = 0; if (trigger_enable) { if (atomic_inc_return(&file->tm_ref) > 1) return ret; set_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); ret = trace_event_enable_disable(file, 1, 1); } else { if (atomic_dec_return(&file->tm_ref) > 0) return ret; clear_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); ret = trace_event_enable_disable(file, 0, 1); } return ret; }

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/** * clear_event_triggers - Clear all triggers associated with a trace array * @tr: The trace array to clear * * For each trigger, the triggering event has its tm_ref decremented * via trace_event_trigger_enable_disable(), and any associated event * (in the case of enable/disable_event triggers) will have its sm_ref * decremented via free()->trace_event_enable_disable(). That * combination effectively reverses the soft-mode/trigger state added * by trigger registration. * * Must be called with event_mutex held. */
void clear_event_triggers(struct trace_array *tr) { struct trace_event_file *file; list_for_each_entry(file, &tr->events, list) { struct event_trigger_data *data; list_for_each_entry_rcu(data, &file->triggers, list) { trace_event_trigger_enable_disable(file, 0); if (data->ops->free) data->ops->free(data->ops, data); } } }

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/** * update_cond_flag - Set or reset the TRIGGER_COND bit * @file: The trace_event_file associated with the event * * If an event has triggers and any of those triggers has a filter or * a post_trigger, trigger invocation needs to be deferred until after * the current event has logged its data, and the event should have * its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be * cleared. */
void update_cond_flag(struct trace_event_file *file) { struct event_trigger_data *data; bool set_cond = false; list_for_each_entry_rcu(data, &file->triggers, list) { if (data->filter || event_command_post_trigger(data->cmd_ops) || event_command_needs_rec(data->cmd_ops)) { set_cond = true; break; } } if (set_cond) set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); else clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); }

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/** * register_trigger - Generic event_command @reg implementation * @glob: The raw string used to register the trigger * @ops: The trigger ops associated with the trigger * @data: Trigger-specific data to associate with the trigger * @file: The trace_event_file associated with the event * * Common implementation for event trigger registration. * * Usually used directly as the @reg method in event command * implementations. * * Return: 0 on success, errno otherwise */
static int register_trigger(char *glob, struct event_trigger_ops *ops, struct event_trigger_data *data, struct trace_event_file *file) { struct event_trigger_data *test; int ret = 0; list_for_each_entry_rcu(test, &file->triggers, list) { if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) { ret = -EEXIST; goto out; } } if (data->ops->init) { ret = data->ops->init(data->ops, data); if (ret < 0) goto out; } list_add_rcu(&data->list, &file->triggers); ret++; update_cond_flag(file); if (trace_event_trigger_enable_disable(file, 1) < 0) { list_del_rcu(&data->list); update_cond_flag(file); ret--; } out: return ret; }

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/** * unregister_trigger - Generic event_command @unreg implementation * @glob: The raw string used to register the trigger * @ops: The trigger ops associated with the trigger * @test: Trigger-specific data used to find the trigger to remove * @file: The trace_event_file associated with the event * * Common implementation for event trigger unregistration. * * Usually used directly as the @unreg method in event command * implementations. */
void unregister_trigger(char *glob, struct event_trigger_ops *ops, struct event_trigger_data *test, struct trace_event_file *file) { struct event_trigger_data *data; bool unregistered = false; list_for_each_entry_rcu(data, &file->triggers, list) { if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) { unregistered = true; list_del_rcu(&data->list); trace_event_trigger_enable_disable(file, 0); update_cond_flag(file); break; } } if (unregistered && data->ops->free) data->ops->free(data->ops, data); }

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/** * event_trigger_callback - Generic event_command @func implementation * @cmd_ops: The command ops, used for trigger registration * @file: The trace_event_file associated with the event * @glob: The raw string used to register the trigger * @cmd: The cmd portion of the string used to register the trigger * @param: The params portion of the string used to register the trigger * * Common implementation for event command parsing and trigger * instantiation. * * Usually used directly as the @func method in event command * implementations. * * Return: 0 on success, errno otherwise */
static int event_trigger_callback(struct event_command *cmd_ops, struct trace_event_file *file, char *glob, char *cmd, char *param) { struct event_trigger_data *trigger_data; struct event_trigger_ops *trigger_ops; char *trigger = NULL; char *number; int ret; /* separate the trigger from the filter (t:n [if filter]) */ if (param && isdigit(param[0])) trigger = strsep(&param, " \t"); trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); ret = -ENOMEM; trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); if (!trigger_data) goto out; trigger_data->count = -1; trigger_data->ops = trigger_ops; trigger_data->cmd_ops = cmd_ops; INIT_LIST_HEAD(&trigger_data->list); INIT_LIST_HEAD(&trigger_data->named_list); if (glob[0] == '!') { cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); kfree(trigger_data); ret = 0; goto out; } if (trigger) { number = strsep(&trigger, ":"); ret = -EINVAL; if (!strlen(number)) goto out_free; /* * We use the callback data field (which is a pointer) * as our counter. */ ret = kstrtoul(number, 0, &trigger_data->count); if (ret) goto out_free; } if (!param) /* if param is non-empty, it's supposed to be a filter */ goto out_reg; if (!cmd_ops->set_filter) goto out_reg; ret = cmd_ops->set_filter(param, trigger_data, file); if (ret < 0) goto out_free; out_reg: ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); /* * The above returns on success the # of functions enabled, * but if it didn't find any functions it returns zero. * Consider no functions a failure too. */ if (!ret) { ret = -ENOENT; goto out_free; } else if (ret < 0) goto out_free; ret = 0; out: return ret; out_free: if (cmd_ops->set_filter) cmd_ops->set_filter(NULL, trigger_data, NULL); kfree(trigger_data); goto out; }

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/** * set_trigger_filter - Generic event_command @set_filter implementation * @filter_str: The filter string for the trigger, NULL to remove filter * @trigger_data: Trigger-specific data * @file: The trace_event_file associated with the event * * Common implementation for event command filter parsing and filter * instantiation. * * Usually used directly as the @set_filter method in event command * implementations. * * Also used to remove a filter (if filter_str = NULL). * * Return: 0 on success, errno otherwise */
int set_trigger_filter(char *filter_str, struct event_trigger_data *trigger_data, struct trace_event_file *file) { struct event_trigger_data *data = trigger_data; struct event_filter *filter = NULL, *tmp; int ret = -EINVAL; char *s; if (!filter_str) /* clear the current filter */ goto assign; s = strsep(&filter_str, " \t"); if (!strlen(s) || strcmp(s, "if") != 0) goto out; if (!filter_str) goto out; /* The filter is for the 'trigger' event, not the triggered event */ ret = create_event_filter(file->event_call, filter_str, false, &filter); if (ret) goto out; assign: tmp = rcu_access_pointer(data->filter); rcu_assign_pointer(data->filter, filter); if (tmp) { /* Make sure the call is done with the filter */ synchronize_sched(); free_event_filter(tmp); } kfree(data->filter_str); data->filter_str = NULL; if (filter_str) { data->filter_str = kstrdup(filter_str, GFP_KERNEL); if (!data->filter_str) { free_event_filter(rcu_access_pointer(data->filter)); data->filter = NULL; ret = -ENOMEM; } } out: return ret; }

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static LIST_HEAD(named_triggers); /** * find_named_trigger - Find the common named trigger associated with @name * @name: The name of the set of named triggers to find the common data for * * Named triggers are sets of triggers that share a common set of * trigger data. The first named trigger registered with a given name * owns the common trigger data that the others subsequently * registered with the same name will reference. This function * returns the common trigger data associated with that first * registered instance. * * Return: the common trigger data for the given named trigger on * success, NULL otherwise. */
struct event_trigger_data *find_named_trigger(const char *name) { struct event_trigger_data *data; if (!name) return NULL; list_for_each_entry(data, &named_triggers, named_list) { if (data->named_data) continue; if (strcmp(data->name, name) == 0) return data; } return NULL; }

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/** * is_named_trigger - determine if a given trigger is a named trigger * @test: The trigger data to test * * Return: true if 'test' is a named trigger, false otherwise. */
bool is_named_trigger(struct event_trigger_data *test) { struct event_trigger_data *data; list_for_each_entry(data, &named_triggers, named_list) { if (test == data) return true; } return false; }

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/** * save_named_trigger - save the trigger in the named trigger list * @name: The name of the named trigger set * @data: The trigger data to save * * Return: 0 if successful, negative error otherwise. */
int save_named_trigger(const char *name, struct event_trigger_data *data) { data->name = kstrdup(name, GFP_KERNEL); if (!data->name) return -ENOMEM; list_add(&data->named_list, &named_triggers); return 0; }

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/** * del_named_trigger - delete a trigger from the named trigger list * @data: The trigger data to delete */
void del_named_trigger(struct event_trigger_data *data) { kfree(data->name); data->name = NULL; list_del(&data->named_list); }

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static void __pause_named_trigger(struct event_trigger_data *data, bool pause) { struct event_trigger_data *test; list_for_each_entry(test, &named_triggers, named_list) { if (strcmp(test->name, data->name) == 0) { if (pause) { test->paused_tmp = test->paused; test->paused = true; } else { test->paused = test->paused_tmp; } } } }

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/** * pause_named_trigger - Pause all named triggers with the same name * @data: The trigger data of a named trigger to pause * * Pauses a named trigger along with all other triggers having the * same name. Because named triggers share a common set of data, * pausing only one is meaningless, so pausing one named trigger needs * to pause all triggers with the same name. */
void pause_named_trigger(struct event_trigger_data *data) { __pause_named_trigger(data, true); }

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/** * unpause_named_trigger - Un-pause all named triggers with the same name * @data: The trigger data of a named trigger to unpause * * Un-pauses a named trigger along with all other triggers having the * same name. Because named triggers share a common set of data, * unpausing only one is meaningless, so unpausing one named trigger * needs to unpause all triggers with the same name. */
void unpause_named_trigger(struct event_trigger_data *data) { __pause_named_trigger(data, false); }

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/** * set_named_trigger_data - Associate common named trigger data * @data: The trigger data of a named trigger to unpause * * Named triggers are sets of triggers that share a common set of * trigger data. The first named trigger registered with a given name * owns the common trigger data that the others subsequently * registered with the same name will reference. This function * associates the common trigger data from the first trigger with the * given trigger. */
void set_named_trigger_data(struct event_trigger_data *data, struct event_trigger_data *named_data) { data->named_data = named_data; }

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static void traceon_trigger(struct event_trigger_data *data, void *rec) { if (tracing_is_on()) return; tracing_on(); }

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static void traceon_count_trigger(struct event_trigger_data *data, void *rec) { if (tracing_is_on()) return; if (!data->count) return; if (data->count != -1) (data->count)--; tracing_on(); }

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static void traceoff_trigger(struct event_trigger_data *data, void *rec) { if (!tracing_is_on()) return; tracing_off(); }

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static void traceoff_count_trigger(struct event_trigger_data *data, void *rec) { if (!tracing_is_on()) return; if (!data->count) return; if (data->count != -1) (data->count)--; tracing_off(); }

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static int traceon_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, struct event_trigger_data *data) { return event_trigger_print("traceon", m, (void *)data->count, data->filter_str); }

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static int traceoff_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, struct event_trigger_data *data) { return event_trigger_print("traceoff", m, (void *)data->count, data->filter_str); }

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static struct event_trigger_ops traceon_trigger_ops = { .func = traceon_trigger, .print = traceon_trigger_print, .init = event_trigger_init, .free = event_trigger_free, }; static struct event_trigger_ops traceon_count_trigger_ops = { .func = traceon_count_trigger, .print = traceon_trigger_print, .init = event_trigger_init, .free = event_trigger_free, }; static struct event_trigger_ops traceoff_trigger_ops = { .func = traceoff_trigger, .print = traceoff_trigger_print, .init = event_trigger_init, .free = event_trigger_free, }; static struct event_trigger_ops traceoff_count_trigger_ops = { .func = traceoff_count_trigger, .print = traceoff_trigger_print, .init = event_trigger_init, .free = event_trigger_free, };
static struct event_trigger_ops * onoff_get_trigger_ops(char *cmd, char *param) { struct event_trigger_ops *ops; /* we register both traceon and traceoff to this callback */ if (strcmp(cmd, "traceon") == 0) ops = param ? &traceon_count_trigger_ops : &traceon_trigger_ops; else ops = param ? &traceoff_count_trigger_ops : &traceoff_trigger_ops; return ops; }

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static struct event_command trigger_traceon_cmd = { .name = "traceon", .trigger_type = ETT_TRACE_ONOFF, .func = event_trigger_callback, .reg = register_trigger, .unreg = unregister_trigger, .get_trigger_ops = onoff_get_trigger_ops, .set_filter = set_trigger_filter, }; static struct event_command trigger_traceoff_cmd = { .name = "traceoff", .trigger_type = ETT_TRACE_ONOFF, .flags = EVENT_CMD_FL_POST_TRIGGER, .func = event_trigger_callback, .reg = register_trigger, .unreg = unregister_trigger, .get_trigger_ops = onoff_get_trigger_ops, .set_filter = set_trigger_filter, }; #ifdef CONFIG_TRACER_SNAPSHOT
static void snapshot_trigger(struct event_trigger_data *data, void *rec) { tracing_snapshot(); }

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static void snapshot_count_trigger(struct event_trigger_data *data, void *rec) { if (!data->count) return; if (data->count != -1) (data->count)--; snapshot_trigger(data, rec); }

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static int register_snapshot_trigger(char *glob, struct event_trigger_ops *ops, struct event_trigger_data *data, struct trace_event_file *file) { int ret = register_trigger(glob, ops, data, file); if (ret > 0 && tracing_alloc_snapshot() != 0) { unregister_trigger(glob, ops, data, file); ret = 0; } return ret; }

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static int snapshot_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, struct event_trigger_data *data) { return event_trigger_print("snapshot", m, (void *)data->count, data->filter_str); }

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static struct event_trigger_ops snapshot_trigger_ops = { .func = snapshot_trigger, .print = snapshot_trigger_print, .init = event_trigger_init, .free = event_trigger_free, }; static struct event_trigger_ops snapshot_count_trigger_ops = { .func = snapshot_count_trigger, .print = snapshot_trigger_print, .init = event_trigger_init, .free = event_trigger_free, };
static struct event_trigger_ops * snapshot_get_trigger_ops(char *cmd, char *param) { return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops; }

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static struct event_command trigger_snapshot_cmd = { .name = "snapshot", .trigger_type = ETT_SNAPSHOT, .func = event_trigger_callback, .reg = register_snapshot_trigger, .unreg = unregister_trigger, .get_trigger_ops = snapshot_get_trigger_ops, .set_filter = set_trigger_filter, };
static __init int register_trigger_snapshot_cmd(void) { int ret; ret = register_event_command(&trigger_snapshot_cmd); WARN_ON(ret < 0); return ret; }

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#else
static __init int register_trigger_snapshot_cmd(void) { return 0; }

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#endif /* CONFIG_TRACER_SNAPSHOT */ #ifdef CONFIG_STACKTRACE #ifdef CONFIG_UNWINDER_ORC /* Skip 2: * event_triggers_post_call() * trace_event_raw_event_xxx() */ # define STACK_SKIP 2 #else /* * Skip 4: * stacktrace_trigger() * event_triggers_post_call() * trace_event_buffer_commit() * trace_event_raw_event_xxx() */ #define STACK_SKIP 4 #endif
static void stacktrace_trigger(struct event_trigger_data *data, void *rec) { trace_dump_stack(STACK_SKIP); }

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static void stacktrace_count_trigger(struct event_trigger_data *data, void *rec) { if (!data->count) return; if (data->count != -1) (data->count)--; stacktrace_trigger(data, rec); }

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static int stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, struct event_trigger_data *data) { return event_trigger_print("stacktrace", m, (void *)data->count, data->filter_str); }

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static struct event_trigger_ops stacktrace_trigger_ops = { .func = stacktrace_trigger, .print = stacktrace_trigger_print, .init = event_trigger_init, .free = event_trigger_free, }; static struct event_trigger_ops stacktrace_count_trigger_ops = { .func = stacktrace_count_trigger, .print = stacktrace_trigger_print, .init = event_trigger_init, .free = event_trigger_free, };
static struct event_trigger_ops * stacktrace_get_trigger_ops(char *cmd, char *param) { return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops; }

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static struct event_command trigger_stacktrace_cmd = { .name = "stacktrace", .trigger_type = ETT_STACKTRACE, .flags = EVENT_CMD_FL_POST_TRIGGER, .func = event_trigger_callback, .reg = register_trigger, .unreg = unregister_trigger, .get_trigger_ops = stacktrace_get_trigger_ops, .set_filter = set_trigger_filter, };
static __init int register_trigger_stacktrace_cmd(void) { int ret; ret = register_event_command(&trigger_stacktrace_cmd); WARN_ON(ret < 0); return ret; }

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#else
static __init int register_trigger_stacktrace_cmd(void) { return 0; }

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#endif /* CONFIG_STACKTRACE */
static __init void unregister_trigger_traceon_traceoff_cmds(void) { unregister_event_command(&trigger_traceon_cmd); unregister_event_command(&trigger_traceoff_cmd); }

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static void event_enable_trigger(struct event_trigger_data *data, void *rec) { struct enable_trigger_data *enable_data = data->private_data; if (enable_data->enable) clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); else set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); }

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static void event_enable_count_trigger(struct event_trigger_data *data, void *rec) { struct enable_trigger_data *enable_data = data->private_data; if (!data->count) return; /* Skip if the event is in a state we want to switch to */ if (enable_data->enable == !(enable_data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) return; if (data->count != -1) (data->count)--; event_enable_trigger(data, rec); }

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int event_enable_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, struct event_trigger_data *data) { struct enable_trigger_data *enable_data = data->private_data; seq_printf(m, "%s:%s:%s", enable_data->hist ? (enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) : (enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR), enable_data->file->event_call->class->system, trace_event_name(enable_data->file->event_call)); if (data->count == -1) seq_puts(m, ":unlimited"); else seq_printf(m, ":count=%ld", data->count); if (data->filter_str) seq_printf(m, " if %s\n", data->filter_str); else seq_putc(m, '\n'); return 0; }

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Total135100.00%5100.00%


void event_enable_trigger_free(struct event_trigger_ops *ops, struct event_trigger_data *data) { struct enable_trigger_data *enable_data = data->private_data; if (WARN_ON_ONCE(data->ref <= 0)) return; data->ref--; if (!data->ref) { /* Remove the SOFT_MODE flag */ trace_event_enable_disable(enable_data->file, 0, 1); module_put(enable_data->file->event_call->mod); trigger_data_free(data); kfree(enable_data); } }

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static struct event_trigger_ops event_enable_trigger_ops = { .func = event_enable_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops event_enable_count_trigger_ops = { .func = event_enable_count_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops event_disable_trigger_ops = { .func = event_enable_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, }; static struct event_trigger_ops event_disable_count_trigger_ops = { .func = event_enable_count_trigger, .print = event_enable_trigger_print, .init = event_trigger_init, .free = event_enable_trigger_free, };
int event_enable_trigger_func(struct event_command *cmd_ops, struct trace_event_file *file, char *glob, char *cmd, char *param) { struct trace_event_file *event_enable_file; struct enable_trigger_data *enable_data; struct event_trigger_data *trigger_data; struct event_trigger_ops *trigger_ops; struct trace_array *tr = file->tr; const char *system; const char *event; bool hist = false; char *trigger; char *number; bool enable; int ret; if (!param) return -EINVAL; /* separate the trigger from the filter (s:e:n [if filter]) */ trigger = strsep(&param, " \t"); if (!trigger) return -EINVAL; system = strsep(&trigger, ":"); if (!trigger) return -EINVAL; event = strsep(&trigger, ":"); ret = -EINVAL; event_enable_file = find_event_file(tr, system, event); if (!event_enable_file) goto out; #ifdef CONFIG_HIST_TRIGGERS hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) || (strcmp(cmd, DISABLE_HIST_STR) == 0)); enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || (strcmp(cmd, ENABLE_HIST_STR) == 0)); #else enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; #endif trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); ret = -ENOMEM; trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); if (!trigger_data) goto out; enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL); if (!enable_data) { kfree(trigger_data); goto out; } trigger_data->count = -1; trigger_data->ops = trigger_ops; trigger_data->cmd_ops = cmd_ops; INIT_LIST_HEAD(&trigger_data->list); RCU_INIT_POINTER(trigger_data->filter, NULL); enable_data->hist = hist; enable_data->enable = enable; enable_data->file = event_enable_file; trigger_data->private_data = enable_data; if (glob[0] == '!') { cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); kfree(trigger_data); kfree(enable_data); ret = 0; goto out; } if (trigger) { number = strsep(&trigger, ":"); ret = -EINVAL; if (!strlen(number)) goto out_free; /* * We use the callback data field (which is a pointer) * as our counter. */ ret = kstrtoul(number, 0, &trigger_data->count); if (ret) goto out_free; } if (!param) /* if param is non-empty, it's supposed to be a filter */ goto out_reg; if (!cmd_ops->set_filter) goto out_reg; ret = cmd_ops->set_filter(param, trigger_data, file); if (ret < 0) goto out_free; out_reg: /* Don't let event modules unload while probe registered */ ret = try_module_get(event_enable_file->event_call->mod); if (!ret) { ret = -EBUSY; goto out_free; } ret = trace_event_enable_disable(event_enable_file, 1, 1); if (ret < 0) goto out_put; ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); /* * The above returns on success the # of functions enabled, * but if it didn't find any functions it returns zero. * Consider no functions a failure too. */ if (!ret) { ret = -ENOENT; goto out_disable; } else if (ret < 0) goto out_disable; /* Just return zero, not the number of enabled functions */ ret = 0; out: return ret; out_disable: trace_event_enable_disable(event_enable_file, 0, 1); out_put: module_put(event_enable_file->event_call->mod); out_free: if (cmd_ops->set_filter) cmd_ops->set_filter(NULL, trigger_data, NULL); kfree(trigger_data); kfree(enable_data); goto out; }

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int event_enable_register_trigger(char *glob, struct event_trigger_ops *ops, struct event_trigger_data *data, struct trace_event_file *file) { struct enable_trigger_data *enable_data = data->private_data; struct enable_trigger_data *test_enable_data; struct event_trigger_data *test; int ret = 0; list_for_each_entry_rcu(test, &file->triggers, list) { test_enable_data = test->private_data; if (test_enable_data && (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) && (test_enable_data->file == enable_data->file)) { ret = -EEXIST; goto out; } } if (data->ops->init) { ret = data->ops->init(data->ops, data); if (ret < 0) goto out; } list_add_rcu(&data->list, &file->triggers); ret++; update_cond_flag(file); if (trace_event_trigger_enable_disable(file, 1) < 0) { list_del_rcu(&data->list); update_cond_flag(file); ret--; } out: return ret; }

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void event_enable_unregister_trigger(char *glob, struct event_trigger_ops *ops, struct event_trigger_data *test, struct trace_event_file *file) { struct enable_trigger_data *test_enable_data = test->private_data; struct enable_trigger_data *enable_data; struct event_trigger_data *data; bool unregistered = false; list_for_each_entry_rcu(data, &file->triggers, list) { enable_data = data->private_data; if (enable_data && (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) && (enable_data->file == test_enable_data->file)) { unregistered = true; list_del_rcu(&data->list); trace_event_trigger_enable_disable(file, 0); update_cond_flag(file); break; } } if (unregistered && data->ops->free) data->ops->free(data->ops, data); }

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static struct event_trigger_ops * event_enable_get_trigger_ops(char *cmd, char *param) { struct event_trigger_ops *ops; bool enable; #ifdef CONFIG_HIST_TRIGGERS enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || (strcmp(cmd, ENABLE_HIST_STR) == 0)); #else enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; #endif if (enable) ops = param ? &event_enable_count_trigger_ops : &event_enable_trigger_ops; else ops = param ? &event_disable_count_trigger_ops : &event_disable_trigger_ops; return ops; }

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static struct event_command trigger_enable_cmd = { .name = ENABLE_EVENT_STR, .trigger_type = ETT_EVENT_ENABLE, .func = event_enable_trigger_func, .reg = event_enable_register_trigger, .unreg = event_enable_unregister_trigger, .get_trigger_ops = event_enable_get_trigger_ops, .set_filter = set_trigger_filter, }; static struct event_command trigger_disable_cmd = { .name = DISABLE_EVENT_STR, .trigger_type = ETT_EVENT_ENABLE, .func = event_enable_trigger_func, .reg = event_enable_register_trigger, .unreg = event_enable_unregister_trigger, .get_trigger_ops = event_enable_get_trigger_ops, .set_filter = set_trigger_filter, };
static __init void unregister_trigger_enable_disable_cmds(void) { unregister_event_command(&trigger_enable_cmd); unregister_event_command(&trigger_disable_cmd); }

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static __init int register_trigger_enable_disable_cmds(void) { int ret; ret = register_event_command(&trigger_enable_cmd); if (WARN_ON(ret < 0)) return ret; ret = register_event_command(&trigger_disable_cmd); if (WARN_ON(ret < 0)) unregister_trigger_enable_disable_cmds(); return ret; }

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static __init int register_trigger_traceon_traceoff_cmds(void) { int ret; ret = register_event_command(&trigger_traceon_cmd); if (WARN_ON(ret < 0)) return ret; ret = register_event_command(&trigger_traceoff_cmd); if (WARN_ON(ret < 0)) unregister_trigger_traceon_traceoff_cmds(); return ret; }

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__init int register_trigger_cmds(void) { register_trigger_traceon_traceoff_cmds(); register_trigger_snapshot_cmd(); register_trigger_stacktrace_cmd(); register_trigger_enable_disable_cmds(); register_trigger_hist_enable_disable_cmds(); register_trigger_hist_cmd(); return 0; }

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Directory: kernel/trace
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