/*
* Stage 3 of the trace events.
*
* Override the macros in <trace/trace_event_types.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_FORMAT:
*
* static struct ftrace_event_call __used
* __attribute__((__aligned__(4)))
* __attribute__((section("_ftrace_events"))) event_<call> = {
* .name = "<call>",
* .regfunc = ftrace_reg_event_<call>,
* .unregfunc = ftrace_unreg_event_<call>,
* }
*
*
* For those macros defined with TRACE_EVENT_FORMAT:
*
* 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);
*
* <tstruct>; <-- Here we assign the entries by the TRACE_FIELD.
*
* 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>",
* .regfunc = ftrace_reg_event_<call>,
* .unregfunc = ftrace_unreg_event_<call>,
* .raw_init = ftrace_raw_init_event_<call>,
* .raw_reg = ftrace_raw_reg_event_<call>,
* .raw_unreg = ftrace_raw_unreg_event_<call>,
* }
*
*/
#undef TPFMT
#define TPFMT(fmt, args...) fmt "\n", ##args
#define _TRACE_FORMAT(call, proto, args, fmt) \
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); \
} \
#undef TRACE_FORMAT
#define TRACE_FORMAT(call, proto, args, fmt) \
_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.system = STR(TRACE_SYSTEM), \
.regfunc = ftrace_reg_event_##call, \
.unregfunc = ftrace_unreg_event_##call, \
}
#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign)\
entry->item = assign;
#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
\
static struct ftrace_event_call event_##call; \
\
static void ftrace_raw_event_##call(proto) \
{ \
struct ring_buffer_event *event; \
struct ftrace_raw_##call *entry; \
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); \
\
tstruct; \
\
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_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; \
return 0; \
} \
\
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.system = STR(TRACE_SYSTEM), \
.regfunc = ftrace_reg_event_##call, \
.unregfunc = ftrace_unreg_event_##call, \
.raw_init = ftrace_raw_init_event_##call, \
.raw_reg = ftrace_raw_reg_event_##call, \
.raw_unreg = ftrace_raw_unreg_event_##call, \
}
