6ff9a64d2a
By moving the macro that creates the print format code above the
defining of the event macro helpers (__get_str, __print_symbolic,
and __get_dynamic_array), we get a little cleaner print format.
Instead of:
(char *)((void *)REC + REC->__data_loc_name)
we get:
__get_str(name)
Instead of:
({ static const struct trace_print_flags symbols[] = { { HI_SOFTIRQ, "HI" }, {
we get:
__print_symbolic(REC->vec, { HI_SOFTIRQ, "HI" }, {
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
591 lines
15 KiB
C
591 lines
15 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>
|
|
|
|
#undef __field
|
|
#define __field(type, item) type item;
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) type item[len];
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) unsigned short __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
|
|
#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
|
|
struct ftrace_raw_##name { \
|
|
struct trace_entry ent; \
|
|
tstruct \
|
|
char __data[0]; \
|
|
}; \
|
|
static struct ftrace_event_call event_##name
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
|
|
/*
|
|
* Stage 2 of the trace events.
|
|
*
|
|
* Include the following:
|
|
*
|
|
* struct ftrace_data_offsets_<call> {
|
|
* int <item1>;
|
|
* int <item2>;
|
|
* [...]
|
|
* };
|
|
*
|
|
* The __dynamic_array() macro will create each int <item>, this is
|
|
* to keep the offset of each array from the beginning of the event.
|
|
*/
|
|
|
|
#undef __field
|
|
#define __field(type, item);
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) int item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
|
|
struct ftrace_data_offsets_##call { \
|
|
tstruct; \
|
|
};
|
|
|
|
#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;\n", \
|
|
(unsigned int)offsetof(typeof(field), item), \
|
|
(unsigned int)sizeof(field.item)); \
|
|
if (!ret) \
|
|
return 0;
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) \
|
|
ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
|
|
"offset:%u;\tsize:%u;\n", \
|
|
(unsigned int)offsetof(typeof(field), item), \
|
|
(unsigned int)sizeof(field.item)); \
|
|
if (!ret) \
|
|
return 0;
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
ret = trace_seq_printf(s, "\tfield:__data_loc " #item ";\t" \
|
|
"offset:%u;\tsize:%u;\n", \
|
|
(unsigned int)offsetof(typeof(field), \
|
|
__data_loc_##item), \
|
|
(unsigned int)sizeof(field.__data_loc_##item)); \
|
|
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 TRACE_EVENT
|
|
#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
|
|
static int \
|
|
ftrace_format_##call(struct trace_seq *s) \
|
|
{ \
|
|
struct ftrace_raw_##call field __attribute__((unused)); \
|
|
int ret = 0; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
trace_seq_printf(s, "\nprint fmt: " print); \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
#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)
|
|
|
|
#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
|
|
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
|
|
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; \
|
|
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, #call ": " print); \
|
|
put_cpu(); \
|
|
if (!ret) \
|
|
return TRACE_TYPE_PARTIAL_LINE; \
|
|
\
|
|
return TRACE_TYPE_HANDLED; \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#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)); \
|
|
if (ret) \
|
|
return ret;
|
|
|
|
#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); \
|
|
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);
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
|
|
int \
|
|
ftrace_define_fields_##call(void) \
|
|
{ \
|
|
struct ftrace_raw_##call field; \
|
|
struct ftrace_event_call *event_call = &event_##call; \
|
|
int ret; \
|
|
\
|
|
__common_field(int, type, 1); \
|
|
__common_field(unsigned char, flags, 0); \
|
|
__common_field(unsigned char, preempt_count, 0); \
|
|
__common_field(int, pid, 1); \
|
|
__common_field(int, tgid, 1); \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
#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 __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_size += (len) * sizeof(type);
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \
|
|
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(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; \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* 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>(void)
|
|
* {
|
|
* 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>(void)
|
|
* {
|
|
* 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
|
|
* unsigned long irq_flags;
|
|
* int pc;
|
|
*
|
|
* local_save_flags(irq_flags);
|
|
* pc = preempt_count();
|
|
*
|
|
* event = trace_current_buffer_lock_reserve(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(event, irq_flags, pc);
|
|
* }
|
|
*
|
|
* static int ftrace_raw_reg_event_<call>(void)
|
|
* {
|
|
* 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>(void)
|
|
* {
|
|
* 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>(void)
|
|
* {
|
|
* 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(call, proto, args) \
|
|
static void ftrace_profile_##call(proto) \
|
|
{ \
|
|
extern void perf_tpcounter_event(int); \
|
|
perf_tpcounter_event(event_##call.id); \
|
|
} \
|
|
\
|
|
static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
|
|
{ \
|
|
int ret = 0; \
|
|
\
|
|
if (!atomic_inc_return(&event_call->profile_count)) \
|
|
ret = register_trace_##call(ftrace_profile_##call); \
|
|
\
|
|
return ret; \
|
|
} \
|
|
\
|
|
static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
|
|
{ \
|
|
if (atomic_add_negative(-1, &event_call->profile_count)) \
|
|
unregister_trace_##call(ftrace_profile_##call); \
|
|
}
|
|
|
|
#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(call, proto, args)
|
|
#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
|
|
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
|
|
_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
|
|
\
|
|
static struct ftrace_event_call event_##call; \
|
|
\
|
|
static void ftrace_raw_event_##call(proto) \
|
|
{ \
|
|
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
|
|
struct ftrace_event_call *event_call = &event_##call; \
|
|
struct ring_buffer_event *event; \
|
|
struct ftrace_raw_##call *entry; \
|
|
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(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(event_call, entry, event)) \
|
|
trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
|
|
} \
|
|
\
|
|
static int ftrace_raw_reg_event_##call(void) \
|
|
{ \
|
|
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(void) \
|
|
{ \
|
|
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(void) \
|
|
{ \
|
|
int id; \
|
|
\
|
|
id = register_ftrace_event(&ftrace_event_type_##call); \
|
|
if (!id) \
|
|
return -ENODEV; \
|
|
event_##call.id = id; \
|
|
INIT_LIST_HEAD(&event_##call.fields); \
|
|
init_preds(&event_##call); \
|
|
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_##call, \
|
|
.define_fields = ftrace_define_fields_##call, \
|
|
_TRACE_PROFILE_INIT(call) \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#undef _TRACE_PROFILE
|
|
#undef _TRACE_PROFILE_INIT
|
|
|