ff038f5c37
There are some places in the kernel that define several tracepoints and
they are all identical besides the name. The code to enable, disable and
record is created for every trace point even if most of the code is
identical.
This patch adds TRACE_EVENT_TEMPLATE that lets the developer create
a template TRACE_EVENT and create trace points with DEFINE_EVENT, which
is based off of a given template. Each trace point used by this
will share most of the code, and bring down the size of the kernel
when there are several duplicate events.
Usage is:
TRACE_EVENT_TEMPLATE(name, proto, args, tstruct, assign, print);
Which would be the same as defining a normal TRACE_EVENT.
To create the trace events that the trace points will use:
DEFINE_EVENT(template, name, proto, args) is done. The template
is the name of the TRACE_EVENT_TEMPLATE to use. The name is the
name of the trace point. The parameters proto and args must be the same
as the proto and args of the template. If they are not the same,
then a compile error will result. I tried hard removing this duplication
but the C preprocessor is not powerful enough (or my CPP magic
experience points is not at a high enough level) to not need them.
A lot of trace events are coming in with new XFS development. Most of
the trace points are identical except for the name. The following shows
the advantage of having TRACE_EVENT_TEMPLATE:
$ size fs/xfs/xfs.o.*
text data bss dec hex filename
452114 2788 3520 458422 6feb6 fs/xfs/xfs.o.old
638482 38116 3744 680342 a6196 fs/xfs/xfs.o.template
996954 38116 4480 1039550 fdcbe fs/xfs/xfs.o.trace
xfs.o.old is without any tracepoints.
xfs.o.template uses the new TRACE_EVENT_TEMPLATE.
xfs.o.trace uses the current TRACE_EVENT macros.
Requested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
862 lines
23 KiB
C
862 lines
23 KiB
C
/*
|
|
* Stage 1 of the trace events.
|
|
*
|
|
* Override the macros in <trace/trace_events.h> to include the following:
|
|
*
|
|
* struct ftrace_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/ftrace_event.h>
|
|
|
|
/*
|
|
* TRACE_EVENT_TEMPLATE 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 TRACE_EVENT_TEMPLATE 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) \
|
|
TRACE_EVENT_TEMPLATE(name, \
|
|
PARAMS(proto), \
|
|
PARAMS(args), \
|
|
PARAMS(tstruct), \
|
|
PARAMS(assign), \
|
|
PARAMS(print)); \
|
|
DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
|
|
|
|
|
|
#undef __field
|
|
#define __field(type, item) type item;
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type) type item;
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) type item[len];
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) u32 __data_loc_##item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef TP_STRUCT__entry
|
|
#define TP_STRUCT__entry(args...) args
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(name, proto, args, tstruct, assign, print) \
|
|
struct ftrace_raw_##name { \
|
|
struct trace_entry ent; \
|
|
tstruct \
|
|
char __data[0]; \
|
|
};
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args) \
|
|
static struct ftrace_event_call event_##name
|
|
|
|
#undef __cpparg
|
|
#define __cpparg(arg...) arg
|
|
|
|
/* Callbacks are meaningless to ftrace. */
|
|
#undef TRACE_EVENT_FN
|
|
#define TRACE_EVENT_FN(name, proto, args, tstruct, \
|
|
assign, print, reg, unreg) \
|
|
TRACE_EVENT(name, __cpparg(proto), __cpparg(args), \
|
|
__cpparg(tstruct), __cpparg(assign), __cpparg(print)) \
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
|
|
/*
|
|
* Stage 2 of the trace events.
|
|
*
|
|
* Include the following:
|
|
*
|
|
* struct ftrace_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>.
|
|
*/
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) u32 item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
|
|
struct ftrace_data_offsets_##call { \
|
|
tstruct; \
|
|
};
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Setup the showing format of trace point.
|
|
*
|
|
* int
|
|
* ftrace_format_##call(struct trace_seq *s)
|
|
* {
|
|
* struct ftrace_raw_##call field;
|
|
* int ret;
|
|
*
|
|
* ret = trace_seq_printf(s, #type " " #item ";"
|
|
* " offset:%u; size:%u;\n",
|
|
* offsetof(struct ftrace_raw_##call, item),
|
|
* sizeof(field.type));
|
|
*
|
|
* }
|
|
*/
|
|
|
|
#undef TP_STRUCT__entry
|
|
#define TP_STRUCT__entry(args...) args
|
|
|
|
#undef __field
|
|
#define __field(type, item) \
|
|
ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
|
|
"offset:%u;\tsize:%u;\tsigned:%u;\n", \
|
|
(unsigned int)offsetof(typeof(field), item), \
|
|
(unsigned int)sizeof(field.item), \
|
|
(unsigned int)is_signed_type(type)); \
|
|
if (!ret) \
|
|
return 0;
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type) __field(type, item)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) \
|
|
ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
|
|
"offset:%u;\tsize:%u;\tsigned:%u;\n", \
|
|
(unsigned int)offsetof(typeof(field), item), \
|
|
(unsigned int)sizeof(field.item), \
|
|
(unsigned int)is_signed_type(type)); \
|
|
if (!ret) \
|
|
return 0;
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
|
|
"offset:%u;\tsize:%u;\tsigned:%u;\n", \
|
|
(unsigned int)offsetof(typeof(field), \
|
|
__data_loc_##item), \
|
|
(unsigned int)sizeof(field.__data_loc_##item), \
|
|
(unsigned int)is_signed_type(type)); \
|
|
if (!ret) \
|
|
return 0;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef __entry
|
|
#define __entry REC
|
|
|
|
#undef __print_symbolic
|
|
#undef __get_dynamic_array
|
|
#undef __get_str
|
|
|
|
#undef TP_printk
|
|
#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
|
|
|
|
#undef TP_fast_assign
|
|
#define TP_fast_assign(args...) args
|
|
|
|
#undef TP_perf_assign
|
|
#define TP_perf_assign(args...)
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, func, print) \
|
|
static int \
|
|
ftrace_format_##call(struct ftrace_event_call *unused, \
|
|
struct trace_seq *s) \
|
|
{ \
|
|
struct ftrace_raw_##call field __attribute__((unused)); \
|
|
int ret = 0; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
trace_seq_printf(s, "\nprint fmt: " print); \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 3 of the trace events.
|
|
*
|
|
* Override the macros in <trace/trace_events.h> to include the following:
|
|
*
|
|
* enum print_line_t
|
|
* ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
|
|
* {
|
|
* struct trace_seq *s = &iter->seq;
|
|
* struct ftrace_raw_<call> *field; <-- defined in stage 1
|
|
* struct trace_entry *entry;
|
|
* struct trace_seq *p;
|
|
* int ret;
|
|
*
|
|
* entry = iter->ent;
|
|
*
|
|
* if (entry->type != event_<call>.id) {
|
|
* WARN_ON_ONCE(1);
|
|
* return TRACE_TYPE_UNHANDLED;
|
|
* }
|
|
*
|
|
* field = (typeof(field))entry;
|
|
*
|
|
* p = get_cpu_var(ftrace_event_seq);
|
|
* trace_seq_init(p);
|
|
* ret = trace_seq_printf(s, <TP_printk> "\n");
|
|
* put_cpu();
|
|
* if (!ret)
|
|
* return TRACE_TYPE_PARTIAL_LINE;
|
|
*
|
|
* return TRACE_TYPE_HANDLED;
|
|
* }
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#undef __entry
|
|
#define __entry field
|
|
|
|
#undef TP_printk
|
|
#define TP_printk(fmt, args...) fmt "\n", args
|
|
|
|
#undef __get_dynamic_array
|
|
#define __get_dynamic_array(field) \
|
|
((void *)__entry + (__entry->__data_loc_##field & 0xffff))
|
|
|
|
#undef __get_str
|
|
#define __get_str(field) (char *)__get_dynamic_array(field)
|
|
|
|
#undef __print_flags
|
|
#define __print_flags(flag, delim, flag_array...) \
|
|
({ \
|
|
static const struct trace_print_flags __flags[] = \
|
|
{ flag_array, { -1, NULL }}; \
|
|
ftrace_print_flags_seq(p, delim, flag, __flags); \
|
|
})
|
|
|
|
#undef __print_symbolic
|
|
#define __print_symbolic(value, symbol_array...) \
|
|
({ \
|
|
static const struct trace_print_flags symbols[] = \
|
|
{ symbol_array, { -1, NULL }}; \
|
|
ftrace_print_symbols_seq(p, value, symbols); \
|
|
})
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
|
|
static enum print_line_t \
|
|
ftrace_raw_output_id_##call(int event_id, const char *name, \
|
|
struct trace_iterator *iter, int flags) \
|
|
{ \
|
|
struct trace_seq *s = &iter->seq; \
|
|
struct ftrace_raw_##call *field; \
|
|
struct trace_entry *entry; \
|
|
struct trace_seq *p; \
|
|
int ret; \
|
|
\
|
|
entry = iter->ent; \
|
|
\
|
|
if (entry->type != event_id) { \
|
|
WARN_ON_ONCE(1); \
|
|
return TRACE_TYPE_UNHANDLED; \
|
|
} \
|
|
\
|
|
field = (typeof(field))entry; \
|
|
\
|
|
p = &get_cpu_var(ftrace_event_seq); \
|
|
trace_seq_init(p); \
|
|
ret = trace_seq_printf(s, "%s: ", name); \
|
|
if (ret) \
|
|
ret = trace_seq_printf(s, print); \
|
|
put_cpu(); \
|
|
if (!ret) \
|
|
return TRACE_TYPE_PARTIAL_LINE; \
|
|
\
|
|
return TRACE_TYPE_HANDLED; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args) \
|
|
static enum print_line_t \
|
|
ftrace_raw_output_##name(struct trace_iterator *iter, int flags) \
|
|
{ \
|
|
return ftrace_raw_output_id_##template(event_##name.id, \
|
|
#name, iter, flags); \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type) \
|
|
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
|
|
#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) \
|
|
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
|
|
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
|
|
offsetof(typeof(field), item), \
|
|
sizeof(field.item), 0, FILTER_OTHER); \
|
|
if (ret) \
|
|
return ret;
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
|
|
offsetof(typeof(field), __data_loc_##item), \
|
|
sizeof(field.__data_loc_##item), 0, \
|
|
FILTER_OTHER);
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, func, print) \
|
|
static int \
|
|
ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
|
|
{ \
|
|
struct ftrace_raw_##call field; \
|
|
int ret; \
|
|
\
|
|
ret = trace_define_common_fields(event_call); \
|
|
if (ret) \
|
|
return ret; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* remember the offset of each array from the beginning of the event.
|
|
*/
|
|
|
|
#undef __entry
|
|
#define __entry entry
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
__data_offsets->item = __data_size + \
|
|
offsetof(typeof(*entry), __data); \
|
|
__data_offsets->item |= (len * sizeof(type)) << 16; \
|
|
__data_size += (len) * sizeof(type);
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
|
|
static inline int ftrace_get_offsets_##call( \
|
|
struct ftrace_data_offsets_##call *__data_offsets, proto) \
|
|
{ \
|
|
int __data_size = 0; \
|
|
struct ftrace_raw_##call __maybe_unused *entry; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return __data_size; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#ifdef CONFIG_EVENT_PROFILE
|
|
|
|
/*
|
|
* Generate the functions needed for tracepoint perf_event support.
|
|
*
|
|
* NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
|
|
*
|
|
* static int ftrace_profile_enable_<call>(void)
|
|
* {
|
|
* return register_trace_<call>(ftrace_profile_<call>);
|
|
* }
|
|
*
|
|
* static void ftrace_profile_disable_<call>(void)
|
|
* {
|
|
* unregister_trace_<call>(ftrace_profile_<call>);
|
|
* }
|
|
*
|
|
*/
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print)
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args) \
|
|
\
|
|
static void ftrace_profile_##name(proto); \
|
|
\
|
|
static int ftrace_profile_enable_##name(struct ftrace_event_call *unused)\
|
|
{ \
|
|
return register_trace_##name(ftrace_profile_##name); \
|
|
} \
|
|
\
|
|
static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
|
|
{ \
|
|
unregister_trace_##name(ftrace_profile_##name); \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Stage 4 of the trace events.
|
|
*
|
|
* Override the macros in <trace/trace_events.h> to include the following:
|
|
*
|
|
* static void ftrace_event_<call>(proto)
|
|
* {
|
|
* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
|
|
* }
|
|
*
|
|
* static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* int ret;
|
|
*
|
|
* ret = register_trace_<call>(ftrace_event_<call>);
|
|
* if (!ret)
|
|
* pr_info("event trace: Could not activate trace point "
|
|
* "probe to <call>");
|
|
* return ret;
|
|
* }
|
|
*
|
|
* static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* unregister_trace_<call>(ftrace_event_<call>);
|
|
* }
|
|
*
|
|
*
|
|
* For those macros defined with TRACE_EVENT:
|
|
*
|
|
* static struct ftrace_event_call event_<call>;
|
|
*
|
|
* static void ftrace_raw_event_<call>(proto)
|
|
* {
|
|
* struct ring_buffer_event *event;
|
|
* struct ftrace_raw_<call> *entry; <-- defined in stage 1
|
|
* struct ring_buffer *buffer;
|
|
* unsigned long irq_flags;
|
|
* int pc;
|
|
*
|
|
* local_save_flags(irq_flags);
|
|
* pc = preempt_count();
|
|
*
|
|
* event = trace_current_buffer_lock_reserve(&buffer,
|
|
* event_<call>.id,
|
|
* sizeof(struct ftrace_raw_<call>),
|
|
* irq_flags, pc);
|
|
* if (!event)
|
|
* return;
|
|
* entry = ring_buffer_event_data(event);
|
|
*
|
|
* <assign>; <-- Here we assign the entries by the __field and
|
|
* __array macros.
|
|
*
|
|
* trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
|
|
* }
|
|
*
|
|
* static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* int ret;
|
|
*
|
|
* ret = register_trace_<call>(ftrace_raw_event_<call>);
|
|
* if (!ret)
|
|
* pr_info("event trace: Could not activate trace point "
|
|
* "probe to <call>");
|
|
* return ret;
|
|
* }
|
|
*
|
|
* static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* unregister_trace_<call>(ftrace_raw_event_<call>);
|
|
* }
|
|
*
|
|
* static struct trace_event ftrace_event_type_<call> = {
|
|
* .trace = ftrace_raw_output_<call>, <-- stage 2
|
|
* };
|
|
*
|
|
* static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* int id;
|
|
*
|
|
* id = register_ftrace_event(&ftrace_event_type_<call>);
|
|
* if (!id)
|
|
* return -ENODEV;
|
|
* event_<call>.id = id;
|
|
* return 0;
|
|
* }
|
|
*
|
|
* static struct ftrace_event_call __used
|
|
* __attribute__((__aligned__(4)))
|
|
* __attribute__((section("_ftrace_events"))) event_<call> = {
|
|
* .name = "<call>",
|
|
* .system = "<system>",
|
|
* .raw_init = ftrace_raw_init_event_<call>,
|
|
* .regfunc = ftrace_reg_event_<call>,
|
|
* .unregfunc = ftrace_unreg_event_<call>,
|
|
* .show_format = ftrace_format_<call>,
|
|
* }
|
|
*
|
|
*/
|
|
|
|
#undef TP_FMT
|
|
#define TP_FMT(fmt, args...) fmt "\n", ##args
|
|
|
|
#ifdef CONFIG_EVENT_PROFILE
|
|
|
|
#define _TRACE_PROFILE_INIT(call) \
|
|
.profile_count = ATOMIC_INIT(-1), \
|
|
.profile_enable = ftrace_profile_enable_##call, \
|
|
.profile_disable = ftrace_profile_disable_##call,
|
|
|
|
#else
|
|
#define _TRACE_PROFILE_INIT(call)
|
|
#endif
|
|
|
|
#undef __entry
|
|
#define __entry entry
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
__entry->__data_loc_##item = __data_offsets.item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1) \
|
|
|
|
#undef __assign_str
|
|
#define __assign_str(dst, src) \
|
|
strcpy(__get_str(dst), src);
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
|
|
\
|
|
static void ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
|
|
proto) \
|
|
{ \
|
|
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
|
|
struct ring_buffer_event *event; \
|
|
struct ftrace_raw_##call *entry; \
|
|
struct ring_buffer *buffer; \
|
|
unsigned long irq_flags; \
|
|
int __data_size; \
|
|
int pc; \
|
|
\
|
|
local_save_flags(irq_flags); \
|
|
pc = preempt_count(); \
|
|
\
|
|
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
|
|
\
|
|
event = trace_current_buffer_lock_reserve(&buffer, \
|
|
event_call->id, \
|
|
sizeof(*entry) + __data_size, \
|
|
irq_flags, pc); \
|
|
if (!event) \
|
|
return; \
|
|
entry = ring_buffer_event_data(event); \
|
|
\
|
|
\
|
|
tstruct \
|
|
\
|
|
{ assign; } \
|
|
\
|
|
if (!filter_current_check_discard(buffer, event_call, entry, event)) \
|
|
trace_nowake_buffer_unlock_commit(buffer, \
|
|
event, irq_flags, pc); \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
\
|
|
static void ftrace_raw_event_##call(proto) \
|
|
{ \
|
|
ftrace_raw_event_id_##template(&event_##call, args); \
|
|
} \
|
|
\
|
|
static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
|
|
{ \
|
|
int ret; \
|
|
\
|
|
ret = register_trace_##call(ftrace_raw_event_##call); \
|
|
if (ret) \
|
|
pr_info("event trace: Could not activate trace point " \
|
|
"probe to " #call "\n"); \
|
|
return ret; \
|
|
} \
|
|
\
|
|
static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
|
|
{ \
|
|
unregister_trace_##call(ftrace_raw_event_##call); \
|
|
} \
|
|
\
|
|
static struct trace_event ftrace_event_type_##call = { \
|
|
.trace = ftrace_raw_output_##call, \
|
|
}; \
|
|
\
|
|
static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
|
|
{ \
|
|
int id; \
|
|
\
|
|
id = register_ftrace_event(&ftrace_event_type_##call); \
|
|
if (!id) \
|
|
return -ENODEV; \
|
|
event_##call.id = id; \
|
|
INIT_LIST_HEAD(&event_##call.fields); \
|
|
return 0; \
|
|
} \
|
|
\
|
|
static struct ftrace_event_call __used \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_events"))) event_##call = { \
|
|
.name = #call, \
|
|
.system = __stringify(TRACE_SYSTEM), \
|
|
.event = &ftrace_event_type_##call, \
|
|
.raw_init = ftrace_raw_init_event_##call, \
|
|
.regfunc = ftrace_raw_reg_event_##call, \
|
|
.unregfunc = ftrace_raw_unreg_event_##call, \
|
|
.show_format = ftrace_format_##template, \
|
|
.define_fields = ftrace_define_fields_##template, \
|
|
_TRACE_PROFILE_INIT(call) \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Define the insertion callback to profile events
|
|
*
|
|
* The job is very similar to ftrace_raw_event_<call> except that we don't
|
|
* insert in the ring buffer but in a perf counter.
|
|
*
|
|
* static void ftrace_profile_<call>(proto)
|
|
* {
|
|
* struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
|
|
* struct ftrace_event_call *event_call = &event_<call>;
|
|
* extern void perf_tp_event(int, u64, u64, void *, int);
|
|
* struct ftrace_raw_##call *entry;
|
|
* struct perf_trace_buf *trace_buf;
|
|
* u64 __addr = 0, __count = 1;
|
|
* unsigned long irq_flags;
|
|
* struct trace_entry *ent;
|
|
* int __entry_size;
|
|
* int __data_size;
|
|
* int __cpu
|
|
* int pc;
|
|
*
|
|
* pc = preempt_count();
|
|
*
|
|
* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
|
|
*
|
|
* // Below we want to get the aligned size by taking into account
|
|
* // the u32 field that will later store the buffer size
|
|
* __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
|
|
* sizeof(u64));
|
|
* __entry_size -= sizeof(u32);
|
|
*
|
|
* // Protect the non nmi buffer
|
|
* // This also protects the rcu read side
|
|
* local_irq_save(irq_flags);
|
|
* __cpu = smp_processor_id();
|
|
*
|
|
* if (in_nmi())
|
|
* trace_buf = rcu_dereference(perf_trace_buf_nmi);
|
|
* else
|
|
* trace_buf = rcu_dereference(perf_trace_buf);
|
|
*
|
|
* if (!trace_buf)
|
|
* goto end;
|
|
*
|
|
* trace_buf = per_cpu_ptr(trace_buf, __cpu);
|
|
*
|
|
* // Avoid recursion from perf that could mess up the buffer
|
|
* if (trace_buf->recursion++)
|
|
* goto end_recursion;
|
|
*
|
|
* raw_data = trace_buf->buf;
|
|
*
|
|
* // Make recursion update visible before entering perf_tp_event
|
|
* // so that we protect from perf recursions.
|
|
*
|
|
* barrier();
|
|
*
|
|
* //zero dead bytes from alignment to avoid stack leak to userspace:
|
|
* *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
|
|
* entry = (struct ftrace_raw_<call> *)raw_data;
|
|
* ent = &entry->ent;
|
|
* tracing_generic_entry_update(ent, irq_flags, pc);
|
|
* ent->type = event_call->id;
|
|
*
|
|
* <tstruct> <- do some jobs with dynamic arrays
|
|
*
|
|
* <assign> <- affect our values
|
|
*
|
|
* perf_tp_event(event_call->id, __addr, __count, entry,
|
|
* __entry_size); <- submit them to perf counter
|
|
*
|
|
* }
|
|
*/
|
|
|
|
#ifdef CONFIG_EVENT_PROFILE
|
|
|
|
#undef __perf_addr
|
|
#define __perf_addr(a) __addr = (a)
|
|
|
|
#undef __perf_count
|
|
#define __perf_count(c) __count = (c)
|
|
|
|
#undef TRACE_EVENT_TEMPLATE
|
|
#define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
|
|
static void \
|
|
ftrace_profile_templ_##call(struct ftrace_event_call *event_call, \
|
|
proto) \
|
|
{ \
|
|
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
|
|
extern int perf_swevent_get_recursion_context(void); \
|
|
extern void perf_swevent_put_recursion_context(int rctx); \
|
|
extern void perf_tp_event(int, u64, u64, void *, int); \
|
|
struct ftrace_raw_##call *entry; \
|
|
u64 __addr = 0, __count = 1; \
|
|
unsigned long irq_flags; \
|
|
struct trace_entry *ent; \
|
|
int __entry_size; \
|
|
int __data_size; \
|
|
char *trace_buf; \
|
|
char *raw_data; \
|
|
int __cpu; \
|
|
int rctx; \
|
|
int pc; \
|
|
\
|
|
pc = preempt_count(); \
|
|
\
|
|
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
|
|
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
|
|
sizeof(u64)); \
|
|
__entry_size -= sizeof(u32); \
|
|
\
|
|
if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE, \
|
|
"profile buffer not large enough")) \
|
|
return; \
|
|
\
|
|
local_irq_save(irq_flags); \
|
|
\
|
|
rctx = perf_swevent_get_recursion_context(); \
|
|
if (rctx < 0) \
|
|
goto end_recursion; \
|
|
\
|
|
__cpu = smp_processor_id(); \
|
|
\
|
|
if (in_nmi()) \
|
|
trace_buf = rcu_dereference(perf_trace_buf_nmi); \
|
|
else \
|
|
trace_buf = rcu_dereference(perf_trace_buf); \
|
|
\
|
|
if (!trace_buf) \
|
|
goto end; \
|
|
\
|
|
raw_data = per_cpu_ptr(trace_buf, __cpu); \
|
|
\
|
|
*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
|
|
entry = (struct ftrace_raw_##call *)raw_data; \
|
|
ent = &entry->ent; \
|
|
tracing_generic_entry_update(ent, irq_flags, pc); \
|
|
ent->type = event_call->id; \
|
|
\
|
|
tstruct \
|
|
\
|
|
{ assign; } \
|
|
\
|
|
perf_tp_event(event_call->id, __addr, __count, entry, \
|
|
__entry_size); \
|
|
\
|
|
end: \
|
|
perf_swevent_put_recursion_context(rctx); \
|
|
end_recursion: \
|
|
local_irq_restore(irq_flags); \
|
|
\
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
static void ftrace_profile_##call(proto) \
|
|
{ \
|
|
struct ftrace_event_call *event_call = &event_##call; \
|
|
\
|
|
ftrace_profile_templ_##template(event_call, args); \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
#endif /* CONFIG_EVENT_PROFILE */
|
|
|
|
#undef _TRACE_PROFILE_INIT
|
|
|