30199137c8
Pass extra arguments to match operation for checking exact match. If the event doesn't support exact match, it will be ignored. Link: http://lkml.kernel.org/r/156095685930.28024.10405547027475590975.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Common header file for generic dynamic events.
|
|
*/
|
|
|
|
#ifndef _TRACE_DYNEVENT_H
|
|
#define _TRACE_DYNEVENT_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include "trace.h"
|
|
|
|
struct dyn_event;
|
|
|
|
/**
|
|
* struct dyn_event_operations - Methods for each type of dynamic events
|
|
*
|
|
* These methods must be set for each type, since there is no default method.
|
|
* Before using this for dyn_event_init(), it must be registered by
|
|
* dyn_event_register().
|
|
*
|
|
* @create: Parse and create event method. This is invoked when user passes
|
|
* a event definition to dynamic_events interface. This must not destruct
|
|
* the arguments and return -ECANCELED if given arguments doesn't match its
|
|
* command prefix.
|
|
* @show: Showing method. This is invoked when user reads the event definitions
|
|
* via dynamic_events interface.
|
|
* @is_busy: Check whether given event is busy so that it can not be deleted.
|
|
* Return true if it is busy, otherwides false.
|
|
* @free: Delete the given event. Return 0 if success, otherwides error.
|
|
* @match: Check whether given event and system name match this event. The argc
|
|
* and argv is used for exact match. Return true if it matches, otherwides
|
|
* false.
|
|
*
|
|
* Except for @create, these methods are called under holding event_mutex.
|
|
*/
|
|
struct dyn_event_operations {
|
|
struct list_head list;
|
|
int (*create)(int argc, const char *argv[]);
|
|
int (*show)(struct seq_file *m, struct dyn_event *ev);
|
|
bool (*is_busy)(struct dyn_event *ev);
|
|
int (*free)(struct dyn_event *ev);
|
|
bool (*match)(const char *system, const char *event,
|
|
int argc, const char **argv, struct dyn_event *ev);
|
|
};
|
|
|
|
/* Register new dyn_event type -- must be called at first */
|
|
int dyn_event_register(struct dyn_event_operations *ops);
|
|
|
|
/**
|
|
* struct dyn_event - Dynamic event list header
|
|
*
|
|
* The dyn_event structure encapsulates a list and a pointer to the operators
|
|
* for making a global list of dynamic events.
|
|
* User must includes this in each event structure, so that those events can
|
|
* be added/removed via dynamic_events interface.
|
|
*/
|
|
struct dyn_event {
|
|
struct list_head list;
|
|
struct dyn_event_operations *ops;
|
|
};
|
|
|
|
extern struct list_head dyn_event_list;
|
|
|
|
static inline
|
|
int dyn_event_init(struct dyn_event *ev, struct dyn_event_operations *ops)
|
|
{
|
|
if (!ev || !ops)
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&ev->list);
|
|
ev->ops = ops;
|
|
return 0;
|
|
}
|
|
|
|
static inline int dyn_event_add(struct dyn_event *ev)
|
|
{
|
|
lockdep_assert_held(&event_mutex);
|
|
|
|
if (!ev || !ev->ops)
|
|
return -EINVAL;
|
|
|
|
list_add_tail(&ev->list, &dyn_event_list);
|
|
return 0;
|
|
}
|
|
|
|
static inline void dyn_event_remove(struct dyn_event *ev)
|
|
{
|
|
lockdep_assert_held(&event_mutex);
|
|
list_del_init(&ev->list);
|
|
}
|
|
|
|
void *dyn_event_seq_start(struct seq_file *m, loff_t *pos);
|
|
void *dyn_event_seq_next(struct seq_file *m, void *v, loff_t *pos);
|
|
void dyn_event_seq_stop(struct seq_file *m, void *v);
|
|
int dyn_events_release_all(struct dyn_event_operations *type);
|
|
int dyn_event_release(int argc, char **argv, struct dyn_event_operations *type);
|
|
|
|
/*
|
|
* for_each_dyn_event - iterate over the dyn_event list
|
|
* @pos: the struct dyn_event * to use as a loop cursor
|
|
*
|
|
* This is just a basement of for_each macro. Wrap this for
|
|
* each actual event structure with ops filtering.
|
|
*/
|
|
#define for_each_dyn_event(pos) \
|
|
list_for_each_entry(pos, &dyn_event_list, list)
|
|
|
|
/*
|
|
* for_each_dyn_event - iterate over the dyn_event list safely
|
|
* @pos: the struct dyn_event * to use as a loop cursor
|
|
* @n: the struct dyn_event * to use as temporary storage
|
|
*/
|
|
#define for_each_dyn_event_safe(pos, n) \
|
|
list_for_each_entry_safe(pos, n, &dyn_event_list, list)
|
|
|
|
#endif
|