mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
31155bc03e
Module example showing how to use the Linux Kernel Markers. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
#ifndef _LINUX_MARKER_H
|
|
#define _LINUX_MARKER_H
|
|
|
|
/*
|
|
* Code markup for dynamic and static tracing.
|
|
*
|
|
* See Documentation/marker.txt.
|
|
*
|
|
* (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
|
|
*
|
|
* This file is released under the GPLv2.
|
|
* See the file COPYING for more details.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct module;
|
|
struct marker;
|
|
|
|
/**
|
|
* marker_probe_func - Type of a marker probe function
|
|
* @mdata: pointer of type struct marker
|
|
* @private_data: caller site private data
|
|
* @fmt: format string
|
|
* @...: variable argument list
|
|
*
|
|
* Type of marker probe functions. They receive the mdata and need to parse the
|
|
* format string to recover the variable argument list.
|
|
*/
|
|
typedef void marker_probe_func(const struct marker *mdata,
|
|
void *private_data, const char *fmt, ...);
|
|
|
|
struct marker {
|
|
const char *name; /* Marker name */
|
|
const char *format; /* Marker format string, describing the
|
|
* variable argument list.
|
|
*/
|
|
char state; /* Marker state. */
|
|
marker_probe_func *call;/* Probe handler function pointer */
|
|
void *private; /* Private probe data */
|
|
} __attribute__((aligned(8)));
|
|
|
|
#ifdef CONFIG_MARKERS
|
|
|
|
/*
|
|
* Note : the empty asm volatile with read constraint is used here instead of a
|
|
* "used" attribute to fix a gcc 4.1.x bug.
|
|
* Make sure the alignment of the structure in the __markers section will
|
|
* not add unwanted padding between the beginning of the section and the
|
|
* structure. Force alignment to the same alignment as the section start.
|
|
*/
|
|
#define __trace_mark(name, call_data, format, args...) \
|
|
do { \
|
|
static const char __mstrtab_name_##name[] \
|
|
__attribute__((section("__markers_strings"))) \
|
|
= #name; \
|
|
static const char __mstrtab_format_##name[] \
|
|
__attribute__((section("__markers_strings"))) \
|
|
= format; \
|
|
static struct marker __mark_##name \
|
|
__attribute__((section("__markers"), aligned(8))) = \
|
|
{ __mstrtab_name_##name, __mstrtab_format_##name, \
|
|
0, __mark_empty_function, NULL }; \
|
|
__mark_check_format(format, ## args); \
|
|
if (unlikely(__mark_##name.state)) { \
|
|
preempt_disable(); \
|
|
(*__mark_##name.call) \
|
|
(&__mark_##name, call_data, \
|
|
format, ## args); \
|
|
preempt_enable(); \
|
|
} \
|
|
} while (0)
|
|
|
|
extern void marker_update_probe_range(struct marker *begin,
|
|
struct marker *end, struct module *probe_module, int *refcount);
|
|
#else /* !CONFIG_MARKERS */
|
|
#define __trace_mark(name, call_data, format, args...) \
|
|
__mark_check_format(format, ## args)
|
|
static inline void marker_update_probe_range(struct marker *begin,
|
|
struct marker *end, struct module *probe_module, int *refcount)
|
|
{ }
|
|
#endif /* CONFIG_MARKERS */
|
|
|
|
/**
|
|
* trace_mark - Marker
|
|
* @name: marker name, not quoted.
|
|
* @format: format string
|
|
* @args...: variable argument list
|
|
*
|
|
* Places a marker.
|
|
*/
|
|
#define trace_mark(name, format, args...) \
|
|
__trace_mark(name, NULL, format, ## args)
|
|
|
|
#define MARK_MAX_FORMAT_LEN 1024
|
|
|
|
/**
|
|
* MARK_NOARGS - Format string for a marker with no argument.
|
|
*/
|
|
#define MARK_NOARGS " "
|
|
|
|
/* To be used for string format validity checking with gcc */
|
|
static inline void __printf(1, 2) __mark_check_format(const char *fmt, ...)
|
|
{
|
|
}
|
|
|
|
extern marker_probe_func __mark_empty_function;
|
|
|
|
/*
|
|
* Connect a probe to a marker.
|
|
* private data pointer must be a valid allocated memory address, or NULL.
|
|
*/
|
|
extern int marker_probe_register(const char *name, const char *format,
|
|
marker_probe_func *probe, void *private);
|
|
|
|
/*
|
|
* Returns the private data given to marker_probe_register.
|
|
*/
|
|
extern void *marker_probe_unregister(const char *name);
|
|
/*
|
|
* Unregister a marker by providing the registered private data.
|
|
*/
|
|
extern void *marker_probe_unregister_private_data(void *private);
|
|
|
|
extern int marker_arm(const char *name);
|
|
extern int marker_disarm(const char *name);
|
|
extern void *marker_get_private_data(const char *name);
|
|
|
|
#endif
|