222 строки
7.1 KiB
C
222 строки
7.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* This is similar to the trace_events.h file, but is to only
|
|
* create custom trace events to be attached to existing tracepoints.
|
|
* Where as the TRACE_EVENT() macro (from trace_events.h) will create
|
|
* both the trace event and the tracepoint it will attach the event to,
|
|
* TRACE_CUSTOM_EVENT() is to create only a custom version of an existing
|
|
* trace event (created by TRACE_EVENT() or DEFINE_EVENT()), and will
|
|
* be placed in the "custom" system.
|
|
*/
|
|
|
|
#include <linux/trace_events.h>
|
|
|
|
/* All custom events are placed in the custom group */
|
|
#undef TRACE_SYSTEM
|
|
#define TRACE_SYSTEM custom
|
|
|
|
#ifndef TRACE_SYSTEM_VAR
|
|
#define TRACE_SYSTEM_VAR TRACE_SYSTEM
|
|
#endif
|
|
|
|
/* The init stage creates the system string and enum mappings */
|
|
|
|
#include "stages/init.h"
|
|
|
|
#undef TRACE_CUSTOM_EVENT
|
|
#define TRACE_CUSTOM_EVENT(name, proto, args, tstruct, assign, print) \
|
|
DECLARE_CUSTOM_EVENT_CLASS(name, \
|
|
PARAMS(proto), \
|
|
PARAMS(args), \
|
|
PARAMS(tstruct), \
|
|
PARAMS(assign), \
|
|
PARAMS(print)); \
|
|
DEFINE_CUSTOM_EVENT(name, name, PARAMS(proto), PARAMS(args));
|
|
|
|
/* Stage 1 creates the structure of the recorded event layout */
|
|
|
|
#include "stages/stage1_struct_define.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
|
|
struct trace_custom_event_raw_##name { \
|
|
struct trace_entry ent; \
|
|
tstruct \
|
|
char __data[]; \
|
|
}; \
|
|
\
|
|
static struct trace_event_class custom_event_class_##name;
|
|
|
|
#undef DEFINE_CUSTOM_EVENT
|
|
#define DEFINE_CUSTOM_EVENT(template, name, proto, args) \
|
|
static struct trace_event_call __used \
|
|
__attribute__((__aligned__(4))) custom_event_##name
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 2 creates the custom class */
|
|
|
|
#include "stages/stage2_data_offsets.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
struct trace_custom_event_data_offsets_##call { \
|
|
tstruct; \
|
|
};
|
|
|
|
#undef DEFINE_CUSTOM_EVENT
|
|
#define DEFINE_CUSTOM_EVENT(template, name, proto, args)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 3 create the way to print the custom event */
|
|
|
|
#include "stages/stage3_trace_output.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static notrace enum print_line_t \
|
|
trace_custom_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_custom_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_custom_event_type_funcs_##call = { \
|
|
.trace = trace_custom_raw_output_##call, \
|
|
};
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 4 creates the offset layout for the fields */
|
|
|
|
#include "stages/stage4_event_fields.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, func, print) \
|
|
static struct trace_event_fields trace_custom_event_fields_##call[] = { \
|
|
tstruct \
|
|
{} };
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 5 creates the helper function for dynamic fields */
|
|
|
|
#include "stages/stage5_get_offsets.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static inline notrace int trace_custom_event_get_offsets_##call( \
|
|
struct trace_custom_event_data_offsets_##call *__data_offsets, proto) \
|
|
{ \
|
|
int __data_size = 0; \
|
|
int __maybe_unused __item_length; \
|
|
struct trace_custom_event_raw_##call __maybe_unused *entry; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return __data_size; \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 6 creates the probe function that records the event */
|
|
|
|
#include "stages/stage6_event_callback.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
\
|
|
static notrace void \
|
|
trace_custom_event_raw_event_##call(void *__data, proto) \
|
|
{ \
|
|
struct trace_event_file *trace_file = __data; \
|
|
struct trace_custom_event_data_offsets_##call __maybe_unused __data_offsets; \
|
|
struct trace_event_buffer fbuffer; \
|
|
struct trace_custom_event_raw_##call *entry; \
|
|
int __data_size; \
|
|
\
|
|
if (trace_trigger_soft_disabled(trace_file)) \
|
|
return; \
|
|
\
|
|
__data_size = trace_custom_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_custom_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_CUSTOM_EVENT
|
|
#define DEFINE_CUSTOM_EVENT(template, call, proto, args) \
|
|
static inline void ftrace_test_custom_probe_##call(void) \
|
|
{ \
|
|
check_trace_callback_type_##call(trace_custom_event_raw_event_##template); \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/* Stage 7 creates the actual class and event structure for the custom event */
|
|
|
|
#include "stages/stage7_class_define.h"
|
|
|
|
#undef DECLARE_CUSTOM_EVENT_CLASS
|
|
#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static char custom_print_fmt_##call[] = print; \
|
|
static struct trace_event_class __used __refdata custom_event_class_##call = { \
|
|
.system = TRACE_SYSTEM_STRING, \
|
|
.fields_array = trace_custom_event_fields_##call, \
|
|
.fields = LIST_HEAD_INIT(custom_event_class_##call.fields),\
|
|
.raw_init = trace_event_raw_init, \
|
|
.probe = trace_custom_event_raw_event_##call, \
|
|
.reg = trace_event_reg, \
|
|
};
|
|
|
|
#undef DEFINE_CUSTOM_EVENT
|
|
#define DEFINE_CUSTOM_EVENT(template, call, proto, args) \
|
|
\
|
|
static struct trace_event_call __used custom_event_##call = { \
|
|
.name = #call, \
|
|
.class = &custom_event_class_##template, \
|
|
.event.funcs = &trace_custom_event_type_funcs_##template, \
|
|
.print_fmt = custom_print_fmt_##template, \
|
|
.flags = TRACE_EVENT_FL_CUSTOM, \
|
|
}; \
|
|
static inline int trace_custom_event_##call##_update(struct tracepoint *tp) \
|
|
{ \
|
|
if (tp->name && strcmp(tp->name, #call) == 0) { \
|
|
custom_event_##call.tp = tp; \
|
|
custom_event_##call.flags = TRACE_EVENT_FL_TRACEPOINT; \
|
|
return 1; \
|
|
} \
|
|
return 0; \
|
|
} \
|
|
static struct trace_event_call __used \
|
|
__section("_ftrace_events") *__custom_event_##call = &custom_event_##call
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|