cregit-Linux how code gets into the kernel

Release 4.15 kernel/trace/trace_export.c

Directory: kernel/trace
// SPDX-License-Identifier: GPL-2.0
/*
 * trace_export.c - export basic ftrace utilities to user space
 *
 * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
 */
#include <linux/stringify.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/init.h>

#include "trace_output.h"


#undef TRACE_SYSTEM

#define TRACE_SYSTEM	ftrace

/*
 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
 * function and thus become accesible via perf.
 */

#undef FTRACE_ENTRY_REG

#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
			 filter, regfn) \
	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
                     filter)

/* not needed for this file */

#undef __field_struct

#define __field_struct(type, item)


#undef __field

#define __field(type, item)				type item;


#undef __field_desc

#define __field_desc(type, container, item)		type item;


#undef __array

#define __array(type, item, size)			type item[size];


#undef __array_desc

#define __array_desc(type, container, item, size)	type item[size];


#undef __dynamic_array

#define __dynamic_array(type, item)			type item[];


#undef F_STRUCT

#define F_STRUCT(args...)				args


#undef F_printk

#define F_printk(fmt, args...) fmt, args


#undef FTRACE_ENTRY

#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)	\
struct ____ftrace_##name {                                              \
        tstruct                                                         \
};                                                                      \
static void __always_unused ____ftrace_check_##name(void)               \
{                                                                       \
        struct ____ftrace_##name *__entry = NULL;                       \
                                                                        \
	/* force compile-time check on F_printk() */			\
        printk(print);                                                  \
}


#undef FTRACE_ENTRY_DUP

#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter)	\
	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
                     filter)

#include "trace_entries.h"


#undef __field

#define __field(type, item)						\
	ret = trace_define_field(event_call, #type, #item,              \
                                 offsetof(typeof(field), item),         \
                                 sizeof(field.item),                    \
                                 is_signed_type(type), filter_type);    \
        if (ret)                                                        \
                return ret;


#undef __field_desc

#define __field_desc(type, container, item)	\
	ret = trace_define_field(event_call, #type, #item,              \
                                 offsetof(typeof(field),                \
                                          container.item),              \
                                 sizeof(field.container.item),          \
                                 is_signed_type(type), filter_type);    \
        if (ret)                                                        \
                return ret;


#undef __array

#define __array(type, item, len)					\
	do {                                                            \
                char *type_str = #type"["__stringify(len)"]";           \
                BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
                ret = trace_define_field(event_call, type_str, #item,   \
                                 offsetof(typeof(field), item),         \
                                 sizeof(field.item),                    \
                                 is_signed_type(type), filter_type);    \
                if (ret)                                                \
                        return ret;                                     \
        } while (0);


#undef __array_desc

#define __array_desc(type, container, item, len)			\
	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
        ret = trace_define_field(event_call, #type "[" #len "]", #item, \
                                 offsetof(typeof(field),                \
                                          container.item),              \
                                 sizeof(field.container.item),          \
                                 is_signed_type(type), filter_type);    \
        if (ret)                                                        \
                return ret;


#undef __dynamic_array

#define __dynamic_array(type, item)					\
	ret = trace_define_field(event_call, #type, #item,              \
                                 offsetof(typeof(field), item),         \
                                 0, is_signed_type(type), filter_type);\
        if (ret)                                                        \
                return ret;


#undef FTRACE_ENTRY

#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)	\
static int __init                                                       \
ftrace_define_fields_##name(struct trace_event_call *event_call)        \
{                                                                       \
        struct struct_name field;                                       \
        int ret;                                                        \
        int filter_type = filter;                                       \
                                                                        \
        tstruct;                                                        \
                                                                        \
        return ret;                                                     \
}

#include "trace_entries.h"


#undef __entry

#define __entry REC


#undef __field

#define __field(type, item)


#undef __field_desc

#define __field_desc(type, container, item)


#undef __array

#define __array(type, item, len)


#undef __array_desc

#define __array_desc(type, container, item, len)


#undef __dynamic_array

#define __dynamic_array(type, item)


#undef F_printk

#define F_printk(fmt, args...) __stringify(fmt) ", "  __stringify(args)


#undef FTRACE_ENTRY_REG

#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
			 regfn)						\
                                                                        \
struct trace_event_class __refdata event_class_ftrace_##call = {        \
        .system                 = __stringify(TRACE_SYSTEM),            \
        .define_fields          = ftrace_define_fields_##call,          \
        .fields                 = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
        .reg                    = regfn,                                \
};                                                                      \
                                                                        \
struct trace_event_call __used event_##call = {                         \
        .class                  = &event_class_ftrace_##call,           \
        {                                                               \
                .name                   = #call,                        \
        },                                                              \
        .event.type             = etype,                                \
        .print_fmt              = print,                                \
        .flags                  = TRACE_EVENT_FL_IGNORE_ENABLE,         \
};                                                                      \
struct trace_event_call __used                                          \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;


#undef FTRACE_ENTRY

#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter)	\
	FTRACE_ENTRY_REG(call, struct_name, etype,                      \
                         PARAMS(tstruct), PARAMS(print), filter, NULL)


bool ftrace_event_is_function(struct trace_event_call *call) { return call == &event_function; }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Olsa1487.50%133.33%
Yaowei Bai16.25%133.33%
Steven Rostedt16.25%133.33%
Total16100.00%3100.00%

#include "trace_entries.h"

Overall Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt28062.08%735.00%
Jiri Olsa7717.07%315.00%
Tom Zanussi5011.09%210.00%
Li Zefan204.43%210.00%
Lai Jiangshan204.43%210.00%
Wolfgang Mauerer10.22%15.00%
Greg Kroah-Hartman10.22%15.00%
Yaowei Bai10.22%15.00%
Vaibhav Nagarnaik10.22%15.00%
Total451100.00%20100.00%
Directory: kernel/trace
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