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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __TRACE_STAT_H
#define __TRACE_STAT_H
#include <linux/seq_file.h>
/*
* If you want to provide a stat file (one-shot statistics), fill
* an iterator with stat_start/stat_next and a stat_show callbacks.
* The others callbacks are optional.
*/
struct tracer_stat {
/* The name of your stat file */
const char *name;
/* Iteration over statistic entries */
void *(*stat_start)(struct tracer_stat *trace);
void *(*stat_next)(void *prev, int idx);
/* Compare two entries for stats sorting */
int (*stat_cmp)(void *p1, void *p2);
/* Print a stat entry */
int (*stat_show)(struct seq_file *s, void *p);
/* Release an entry */
void (*stat_release)(void *stat);
/* Print the headers of your stat entries */
int (*stat_headers)(struct seq_file *s);
};
/*
* Destroy or create a stat file
*/
extern int register_stat_tracer(struct tracer_stat *trace);
extern void unregister_stat_tracer(struct tracer_stat *trace);
#endif /* __TRACE_STAT_H */
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