mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 04:02:20 +00:00
84055411d8
When looking for implementation of different phases of the creation of the TRACE_EVENT() macro, it is pretty useless when all helper macro redefinitions are in files labeled "stageX_defines.h". Rename them to state which phase the files are for. For instance, when looking for the defines that are used to create the event fields, seeing "stage4_event_fields.h" gives the developer a good idea that the defines are in that file. Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
470 lines
14 KiB
C
470 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Stage 1 of the trace events.
|
|
*
|
|
* Override the macros in the event tracepoint header <trace/events/XXX.h>
|
|
* to include the following:
|
|
*
|
|
* struct trace_event_raw_<call> {
|
|
* struct trace_entry ent;
|
|
* <type> <item>;
|
|
* <type2> <item2>[<len>];
|
|
* [...]
|
|
* };
|
|
*
|
|
* The <type> <item> is created by the __field(type, item) macro or
|
|
* the __array(type2, item2, len) macro.
|
|
* We simply do "type item;", and that will create the fields
|
|
* in the structure.
|
|
*/
|
|
|
|
#include <linux/trace_events.h>
|
|
|
|
#ifndef TRACE_SYSTEM_VAR
|
|
#define TRACE_SYSTEM_VAR TRACE_SYSTEM
|
|
#endif
|
|
|
|
#include "stages/init.h"
|
|
|
|
/*
|
|
* DECLARE_EVENT_CLASS can be used to add a generic function
|
|
* handlers for events. That is, if all events have the same
|
|
* parameters and just have distinct trace points.
|
|
* Each tracepoint can be defined with DEFINE_EVENT and that
|
|
* will map the DECLARE_EVENT_CLASS to the tracepoint.
|
|
*
|
|
* TRACE_EVENT is a one to one mapping between tracepoint and template.
|
|
*/
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
|
|
DECLARE_EVENT_CLASS(name, \
|
|
PARAMS(proto), \
|
|
PARAMS(args), \
|
|
PARAMS(tstruct), \
|
|
PARAMS(assign), \
|
|
PARAMS(print)); \
|
|
DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
|
|
|
|
#include "stages/stage1_struct_define.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
|
|
struct trace_event_raw_##name { \
|
|
struct trace_entry ent; \
|
|
tstruct \
|
|
char __data[]; \
|
|
}; \
|
|
\
|
|
static struct trace_event_class event_class_##name;
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args) \
|
|
static struct trace_event_call __used \
|
|
__attribute__((__aligned__(4))) event_##name
|
|
|
|
#undef DEFINE_EVENT_FN
|
|
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
/* Callbacks are meaningless to ftrace. */
|
|
#undef TRACE_EVENT_FN
|
|
#define TRACE_EVENT_FN(name, proto, args, tstruct, \
|
|
assign, print, reg, unreg) \
|
|
TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
|
|
PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
|
|
|
|
#undef TRACE_EVENT_FN_COND
|
|
#define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct, \
|
|
assign, print, reg, unreg) \
|
|
TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \
|
|
PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
|
|
|
|
#undef TRACE_EVENT_FLAGS
|
|
#define TRACE_EVENT_FLAGS(name, value) \
|
|
__TRACE_EVENT_FLAGS(name, value)
|
|
|
|
#undef TRACE_EVENT_PERF_PERM
|
|
#define TRACE_EVENT_PERF_PERM(name, expr...) \
|
|
__TRACE_EVENT_PERF_PERM(name, expr)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 2 of the trace events.
|
|
*
|
|
* Include the following:
|
|
*
|
|
* struct trace_event_data_offsets_<call> {
|
|
* u32 <item1>;
|
|
* u32 <item2>;
|
|
* [...]
|
|
* };
|
|
*
|
|
* The __dynamic_array() macro will create each u32 <item>, this is
|
|
* to keep the offset of each array from the beginning of the event.
|
|
* The size of an array is also encoded, in the higher 16 bits of <item>.
|
|
*/
|
|
|
|
#include "stages/stage2_data_offsets.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
struct trace_event_data_offsets_##call { \
|
|
tstruct; \
|
|
};
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
|
|
|
|
#undef TRACE_EVENT_FLAGS
|
|
#define TRACE_EVENT_FLAGS(event, flag)
|
|
|
|
#undef TRACE_EVENT_PERF_PERM
|
|
#define TRACE_EVENT_PERF_PERM(event, expr...)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 3 of the trace events.
|
|
*
|
|
* Override the macros in the event tracepoint header <trace/events/XXX.h>
|
|
* to include the following:
|
|
*
|
|
* enum print_line_t
|
|
* trace_raw_output_<call>(struct trace_iterator *iter, int flags)
|
|
* {
|
|
* struct trace_seq *s = &iter->seq;
|
|
* struct trace_event_raw_<call> *field; <-- defined in stage 1
|
|
* struct trace_seq *p = &iter->tmp_seq;
|
|
*
|
|
* -------(for event)-------
|
|
*
|
|
* struct trace_entry *entry;
|
|
*
|
|
* entry = iter->ent;
|
|
*
|
|
* if (entry->type != event_<call>->event.type) {
|
|
* WARN_ON_ONCE(1);
|
|
* return TRACE_TYPE_UNHANDLED;
|
|
* }
|
|
*
|
|
* field = (typeof(field))entry;
|
|
*
|
|
* trace_seq_init(p);
|
|
* return trace_output_call(iter, <call>, <TP_printk> "\n");
|
|
*
|
|
* ------(or, for event class)------
|
|
*
|
|
* int ret;
|
|
*
|
|
* field = (typeof(field))iter->ent;
|
|
*
|
|
* ret = trace_raw_output_prep(iter, trace_event);
|
|
* if (ret != TRACE_TYPE_HANDLED)
|
|
* return ret;
|
|
*
|
|
* trace_event_printf(iter, <TP_printk> "\n");
|
|
*
|
|
* return trace_handle_return(s);
|
|
* -------
|
|
* }
|
|
*
|
|
* This is the method used to print the raw event to the trace
|
|
* output format. Note, this is not needed if the data is read
|
|
* in binary.
|
|
*/
|
|
|
|
#include "stages/stage3_trace_output.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static notrace enum print_line_t \
|
|
trace_raw_output_##call(struct trace_iterator *iter, int flags, \
|
|
struct trace_event *trace_event) \
|
|
{ \
|
|
struct trace_seq *s = &iter->seq; \
|
|
struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
|
|
struct trace_event_raw_##call *field; \
|
|
int ret; \
|
|
\
|
|
field = (typeof(field))iter->ent; \
|
|
\
|
|
ret = trace_raw_output_prep(iter, trace_event); \
|
|
if (ret != TRACE_TYPE_HANDLED) \
|
|
return ret; \
|
|
\
|
|
trace_event_printf(iter, print); \
|
|
\
|
|
return trace_handle_return(s); \
|
|
} \
|
|
static struct trace_event_functions trace_event_type_funcs_##call = { \
|
|
.trace = trace_raw_output_##call, \
|
|
};
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
|
|
static notrace enum print_line_t \
|
|
trace_raw_output_##call(struct trace_iterator *iter, int flags, \
|
|
struct trace_event *event) \
|
|
{ \
|
|
struct trace_event_raw_##template *field; \
|
|
struct trace_entry *entry; \
|
|
struct trace_seq *p = &iter->tmp_seq; \
|
|
\
|
|
entry = iter->ent; \
|
|
\
|
|
if (entry->type != event_##call.event.type) { \
|
|
WARN_ON_ONCE(1); \
|
|
return TRACE_TYPE_UNHANDLED; \
|
|
} \
|
|
\
|
|
field = (typeof(field))entry; \
|
|
\
|
|
trace_seq_init(p); \
|
|
return trace_output_call(iter, #call, print); \
|
|
} \
|
|
static struct trace_event_functions trace_event_type_funcs_##call = { \
|
|
.trace = trace_raw_output_##call, \
|
|
};
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#include "stages/stage4_event_fields.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
|
|
static struct trace_event_fields trace_event_fields_##call[] = { \
|
|
tstruct \
|
|
{} };
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#include "stages/stage5_get_offsets.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static inline notrace int trace_event_get_offsets_##call( \
|
|
struct trace_event_data_offsets_##call *__data_offsets, proto) \
|
|
{ \
|
|
int __data_size = 0; \
|
|
int __maybe_unused __item_length; \
|
|
struct trace_event_raw_##call __maybe_unused *entry; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return __data_size; \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 4 of the trace events.
|
|
*
|
|
* Override the macros in the event tracepoint header <trace/events/XXX.h>
|
|
* to include the following:
|
|
*
|
|
* For those macros defined with TRACE_EVENT:
|
|
*
|
|
* static struct trace_event_call event_<call>;
|
|
*
|
|
* static void trace_event_raw_event_<call>(void *__data, proto)
|
|
* {
|
|
* struct trace_event_file *trace_file = __data;
|
|
* struct trace_event_call *event_call = trace_file->event_call;
|
|
* struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
|
|
* unsigned long eflags = trace_file->flags;
|
|
* enum event_trigger_type __tt = ETT_NONE;
|
|
* struct ring_buffer_event *event;
|
|
* struct trace_event_raw_<call> *entry; <-- defined in stage 1
|
|
* struct trace_buffer *buffer;
|
|
* unsigned long irq_flags;
|
|
* int __data_size;
|
|
* int pc;
|
|
*
|
|
* if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
|
|
* if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
|
|
* event_triggers_call(trace_file, NULL);
|
|
* if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
|
|
* return;
|
|
* }
|
|
*
|
|
* local_save_flags(irq_flags);
|
|
* pc = preempt_count();
|
|
*
|
|
* __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
|
|
*
|
|
* event = trace_event_buffer_lock_reserve(&buffer, trace_file,
|
|
* event_<call>->event.type,
|
|
* sizeof(*entry) + __data_size,
|
|
* irq_flags, pc);
|
|
* if (!event)
|
|
* return;
|
|
* entry = ring_buffer_event_data(event);
|
|
*
|
|
* { <assign>; } <-- Here we assign the entries by the __field and
|
|
* __array macros.
|
|
*
|
|
* if (eflags & EVENT_FILE_FL_TRIGGER_COND)
|
|
* __tt = event_triggers_call(trace_file, entry);
|
|
*
|
|
* if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
|
|
* &trace_file->flags))
|
|
* ring_buffer_discard_commit(buffer, event);
|
|
* else if (!filter_check_discard(trace_file, entry, buffer, event))
|
|
* trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
|
|
*
|
|
* if (__tt)
|
|
* event_triggers_post_call(trace_file, __tt);
|
|
* }
|
|
*
|
|
* static struct trace_event ftrace_event_type_<call> = {
|
|
* .trace = trace_raw_output_<call>, <-- stage 2
|
|
* };
|
|
*
|
|
* static char print_fmt_<call>[] = <TP_printk>;
|
|
*
|
|
* static struct trace_event_class __used event_class_<template> = {
|
|
* .system = "<system>",
|
|
* .fields_array = trace_event_fields_<call>,
|
|
* .fields = LIST_HEAD_INIT(event_class_##call.fields),
|
|
* .raw_init = trace_event_raw_init,
|
|
* .probe = trace_event_raw_event_##call,
|
|
* .reg = trace_event_reg,
|
|
* };
|
|
*
|
|
* static struct trace_event_call event_<call> = {
|
|
* .class = event_class_<template>,
|
|
* {
|
|
* .tp = &__tracepoint_<call>,
|
|
* },
|
|
* .event = &ftrace_event_type_<call>,
|
|
* .print_fmt = print_fmt_<call>,
|
|
* .flags = TRACE_EVENT_FL_TRACEPOINT,
|
|
* };
|
|
* // its only safe to use pointers when doing linker tricks to
|
|
* // create an array.
|
|
* static struct trace_event_call __used
|
|
* __section("_ftrace_events") *__event_<call> = &event_<call>;
|
|
*
|
|
*/
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
#define _TRACE_PERF_PROTO(call, proto) \
|
|
static notrace void \
|
|
perf_trace_##call(void *__data, proto);
|
|
|
|
#define _TRACE_PERF_INIT(call) \
|
|
.perf_probe = perf_trace_##call,
|
|
|
|
#else
|
|
#define _TRACE_PERF_PROTO(call, proto)
|
|
#define _TRACE_PERF_INIT(call)
|
|
#endif /* CONFIG_PERF_EVENTS */
|
|
|
|
#include "stages/stage6_event_callback.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
\
|
|
static notrace void \
|
|
trace_event_raw_event_##call(void *__data, proto) \
|
|
{ \
|
|
struct trace_event_file *trace_file = __data; \
|
|
struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
|
|
struct trace_event_buffer fbuffer; \
|
|
struct trace_event_raw_##call *entry; \
|
|
int __data_size; \
|
|
\
|
|
if (trace_trigger_soft_disabled(trace_file)) \
|
|
return; \
|
|
\
|
|
__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
|
|
\
|
|
entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
|
|
sizeof(*entry) + __data_size); \
|
|
\
|
|
if (!entry) \
|
|
return; \
|
|
\
|
|
tstruct \
|
|
\
|
|
{ assign; } \
|
|
\
|
|
trace_event_buffer_commit(&fbuffer); \
|
|
}
|
|
/*
|
|
* The ftrace_test_probe is compiled out, it is only here as a build time check
|
|
* to make sure that if the tracepoint handling changes, the ftrace probe will
|
|
* fail to compile unless it too is updated.
|
|
*/
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
static inline void ftrace_test_probe_##call(void) \
|
|
{ \
|
|
check_trace_callback_type_##call(trace_event_raw_event_##template); \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#include "stages/stage7_class_define.h"
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
_TRACE_PERF_PROTO(call, PARAMS(proto)); \
|
|
static char print_fmt_##call[] = print; \
|
|
static struct trace_event_class __used __refdata event_class_##call = { \
|
|
.system = TRACE_SYSTEM_STRING, \
|
|
.fields_array = trace_event_fields_##call, \
|
|
.fields = LIST_HEAD_INIT(event_class_##call.fields),\
|
|
.raw_init = trace_event_raw_init, \
|
|
.probe = trace_event_raw_event_##call, \
|
|
.reg = trace_event_reg, \
|
|
_TRACE_PERF_INIT(call) \
|
|
};
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
\
|
|
static struct trace_event_call __used event_##call = { \
|
|
.class = &event_class_##template, \
|
|
{ \
|
|
.tp = &__tracepoint_##call, \
|
|
}, \
|
|
.event.funcs = &trace_event_type_funcs_##template, \
|
|
.print_fmt = print_fmt_##template, \
|
|
.flags = TRACE_EVENT_FL_TRACEPOINT, \
|
|
}; \
|
|
static struct trace_event_call __used \
|
|
__section("_ftrace_events") *__event_##call = &event_##call
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
|
|
\
|
|
static char print_fmt_##call[] = print; \
|
|
\
|
|
static struct trace_event_call __used event_##call = { \
|
|
.class = &event_class_##template, \
|
|
{ \
|
|
.tp = &__tracepoint_##call, \
|
|
}, \
|
|
.event.funcs = &trace_event_type_funcs_##call, \
|
|
.print_fmt = print_fmt_##call, \
|
|
.flags = TRACE_EVENT_FL_TRACEPOINT, \
|
|
}; \
|
|
static struct trace_event_call __used \
|
|
__section("_ftrace_events") *__event_##call = &event_##call
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|