236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
|
|
* 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>,
|
|
* .show_format = ftrace_format_<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 "\n"); \
|
|
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_FIELD
|
|
#define TRACE_FIELD(type, item, assign)\
|
|
entry->item = assign;
|
|
|
|
#undef TPCMD
|
|
#define TPCMD(cmd...) cmd
|
|
|
|
#undef TRACE_ENTRY
|
|
#define TRACE_ENTRY entry
|
|
|
|
#undef TRACE_FIELD_SPECIAL
|
|
#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
|
|
cmd;
|
|
|
|
#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 "\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; \
|
|
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, \
|
|
.show_format = ftrace_format_##call, \
|
|
}
|