// SPDX-License-Identifier: GPL-2.0
|
/*
|
* trace_events_trigger - trace event triggers
|
*
|
* Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com>
|
*/
|
|
#include <linux/security.h>
|
#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);
|
|
/* make sure current triggers exit before free */
|
tracepoint_synchronize_unregister();
|
|
kfree(data);
|
}
|
|
/**
|
* 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 ring_buffer_event *event)
|
{
|
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, event);
|
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, event);
|
}
|
return tt;
|
}
|
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
|
*
|
* 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)
|
{
|
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, NULL, NULL);
|
}
|
}
|
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) {
|
(*pos)++;
|
return NULL;
|
}
|
return seq_list_next(t, &event_file->triggers, pos);
|
}
|
|
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);
|
}
|
|
static void trigger_stop(struct seq_file *m, void *t)
|
{
|
mutex_unlock(&event_mutex);
|
}
|
|
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;
|
}
|
|
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;
|
|
ret = security_locked_down(LOCKDOWN_TRACEFS);
|
if (ret)
|
return ret;
|
|
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;
|
}
|
|
int trigger_process_regex(struct trace_event_file *file, char *buff)
|
{
|
char *command, *next;
|
struct event_command *p;
|
int ret = -EINVAL;
|
|
next = buff = skip_spaces(buff);
|
command = strsep(&next, ": \t");
|
if (next) {
|
next = skip_spaces(next);
|
if (!*next)
|
next = NULL;
|
}
|
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;
|
}
|
|
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;
|
}
|
|
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;
|
}
|
|
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);
|
}
|
|
static int
|
event_trigger_open(struct inode *inode, struct file *filp)
|
{
|
/* Checks for tracefs lockdown */
|
return event_trigger_regex_open(inode, filp);
|
}
|
|
static int
|
event_trigger_release(struct inode *inode, struct file *file)
|
{
|
return event_trigger_regex_release(inode, file);
|
}
|
|
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;
|
}
|
|
/*
|
* 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;
|
}
|
|
/**
|
* 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;
|
}
|
|
/**
|
* 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;
|
}
|
|
/**
|
* 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);
|
}
|
|
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;
|
}
|
|
/**
|
* 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, *n;
|
list_for_each_entry_safe(data, n, &file->triggers, list) {
|
trace_event_trigger_enable_disable(file, 0);
|
list_del_rcu(&data->list);
|
if (data->ops->free)
|
data->ops->free(data->ops, data);
|
}
|
}
|
}
|
|
/**
|
* 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;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(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);
|
}
|
|
/**
|
* 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;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(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;
|
}
|
|
/**
|
* 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.
|
*/
|
static 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;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(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);
|
}
|
|
/**
|
* 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(¶m, " \t");
|
if (param) {
|
param = skip_spaces(param);
|
if (!*param)
|
param = NULL;
|
}
|
}
|
|
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;
|
trigger_data->private_data = file;
|
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:
|
/* Up the trigger_data count to make sure reg doesn't free it on failure */
|
event_trigger_init(trigger_ops, trigger_data);
|
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) {
|
cmd_ops->unreg(glob, trigger_ops, trigger_data, file);
|
ret = -ENOENT;
|
} else if (ret > 0)
|
ret = 0;
|
|
/* Down the counter of trigger_data or free it if not used anymore */
|
event_trigger_free(trigger_ops, trigger_data);
|
out:
|
return ret;
|
|
out_free:
|
if (cmd_ops->set_filter)
|
cmd_ops->set_filter(NULL, trigger_data, NULL);
|
kfree(trigger_data);
|
goto out;
|
}
|
|
/**
|
* 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->tr, file->event_call,
|
filter_str, false, &filter);
|
/*
|
* If create_event_filter() fails, filter still needs to be freed.
|
* Which the calling code will do with data->filter.
|
*/
|
assign:
|
tmp = rcu_access_pointer(data->filter);
|
|
rcu_assign_pointer(data->filter, filter);
|
|
if (tmp) {
|
/* Make sure the call is done with the filter */
|
tracepoint_synchronize_unregister();
|
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;
|
}
|
|
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;
|
}
|
|
/**
|
* 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;
|
}
|
|
/**
|
* 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;
|
}
|
|
/**
|
* 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);
|
}
|
|
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;
|
}
|
}
|
}
|
}
|
|
/**
|
* 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);
|
}
|
|
/**
|
* 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);
|
}
|
|
/**
|
* 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;
|
}
|
|
struct event_trigger_data *
|
get_named_trigger_data(struct event_trigger_data *data)
|
{
|
return data->named_data;
|
}
|
|
static void
|
traceon_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file) {
|
if (tracer_tracing_is_on(file->tr))
|
return;
|
|
tracer_tracing_on(file->tr);
|
return;
|
}
|
|
if (tracing_is_on())
|
return;
|
|
tracing_on();
|
}
|
|
static void
|
traceon_count_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file) {
|
if (tracer_tracing_is_on(file->tr))
|
return;
|
} else {
|
if (tracing_is_on())
|
return;
|
}
|
|
if (!data->count)
|
return;
|
|
if (data->count != -1)
|
(data->count)--;
|
|
if (file)
|
tracer_tracing_on(file->tr);
|
else
|
tracing_on();
|
}
|
|
static void
|
traceoff_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file) {
|
if (!tracer_tracing_is_on(file->tr))
|
return;
|
|
tracer_tracing_off(file->tr);
|
return;
|
}
|
|
if (!tracing_is_on())
|
return;
|
|
tracing_off();
|
}
|
|
static void
|
traceoff_count_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file) {
|
if (!tracer_tracing_is_on(file->tr))
|
return;
|
} else {
|
if (!tracing_is_on())
|
return;
|
}
|
|
if (!data->count)
|
return;
|
|
if (data->count != -1)
|
(data->count)--;
|
|
if (file)
|
tracer_tracing_off(file->tr);
|
else
|
tracing_off();
|
}
|
|
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);
|
}
|
|
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);
|
}
|
|
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;
|
}
|
|
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,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file)
|
tracing_snapshot_instance(file->tr);
|
else
|
tracing_snapshot();
|
}
|
|
static void
|
snapshot_count_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
if (!data->count)
|
return;
|
|
if (data->count != -1)
|
(data->count)--;
|
|
snapshot_trigger(data, rec, event);
|
}
|
|
static int
|
register_snapshot_trigger(char *glob, struct event_trigger_ops *ops,
|
struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
if (tracing_alloc_snapshot_instance(file->tr) != 0)
|
return 0;
|
|
return register_trigger(glob, ops, data, file);
|
}
|
|
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);
|
}
|
|
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;
|
}
|
|
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;
|
}
|
#else
|
static __init int register_trigger_snapshot_cmd(void) { return 0; }
|
#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,
|
struct ring_buffer_event *event)
|
{
|
struct trace_event_file *file = data->private_data;
|
|
if (file)
|
__trace_stack(file->tr, tracing_gen_ctx(), STACK_SKIP);
|
else
|
trace_dump_stack(STACK_SKIP);
|
}
|
|
static void
|
stacktrace_count_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
if (!data->count)
|
return;
|
|
if (data->count != -1)
|
(data->count)--;
|
|
stacktrace_trigger(data, rec, event);
|
}
|
|
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);
|
}
|
|
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;
|
}
|
|
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;
|
}
|
#else
|
static __init int register_trigger_stacktrace_cmd(void) { return 0; }
|
#endif /* CONFIG_STACKTRACE */
|
|
static __init void unregister_trigger_traceon_traceoff_cmds(void)
|
{
|
unregister_event_command(&trigger_traceon_cmd);
|
unregister_event_command(&trigger_traceoff_cmd);
|
}
|
|
static void
|
event_enable_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
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);
|
}
|
|
static void
|
event_enable_count_trigger(struct event_trigger_data *data, void *rec,
|
struct ring_buffer_event *event)
|
{
|
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, event);
|
}
|
|
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;
|
}
|
|
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);
|
}
|
}
|
|
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(¶m, " \t");
|
if (!trigger)
|
return -EINVAL;
|
if (param) {
|
param = skip_spaces(param);
|
if (!*param)
|
param = NULL;
|
}
|
|
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;
|
}
|
|
/* Up the trigger_data count to make sure nothing frees it on failure */
|
event_trigger_init(trigger_ops, trigger_data);
|
|
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;
|
event_trigger_free(trigger_ops, trigger_data);
|
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);
|
event_trigger_free(trigger_ops, trigger_data);
|
kfree(enable_data);
|
goto out;
|
}
|
|
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;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(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;
|
}
|
|
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;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(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);
|
}
|
|
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;
|
}
|
|
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);
|
}
|
|
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;
|
}
|
|
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;
|
}
|
|
__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;
|
}
|
