236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
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* Stage 3 of the trace events.
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*
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* Override the macros in <trace/trace_event_types.h> to include the following:
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*
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* static void ftrace_event_<call>(proto)
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* {
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* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
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* }
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*
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* static int ftrace_reg_event_<call>(void)
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* {
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* int ret;
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*
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* ret = register_trace_<call>(ftrace_event_<call>);
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* if (!ret)
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* pr_info("event trace: Could not activate trace point "
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* "probe to <call>");
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* return ret;
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* }
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*
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* static void ftrace_unreg_event_<call>(void)
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* {
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* unregister_trace_<call>(ftrace_event_<call>);
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* }
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*
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* For those macros defined with TRACE_FORMAT:
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*
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* static struct ftrace_event_call __used
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* __attribute__((__aligned__(4)))
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* __attribute__((section("_ftrace_events"))) event_<call> = {
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* .name = "<call>",
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* .regfunc = ftrace_reg_event_<call>,
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* .unregfunc = ftrace_unreg_event_<call>,
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* }
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*
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*
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* For those macros defined with TRACE_EVENT_FORMAT:
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*
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* static struct ftrace_event_call event_<call>;
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*
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* static void ftrace_raw_event_<call>(proto)
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* {
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* struct ring_buffer_event *event;
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* struct ftrace_raw_<call> *entry; <-- defined in stage 1
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* unsigned long irq_flags;
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* int pc;
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*
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* local_save_flags(irq_flags);
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* pc = preempt_count();
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*
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* event = trace_current_buffer_lock_reserve(event_<call>.id,
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* sizeof(struct ftrace_raw_<call>),
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* irq_flags, pc);
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* if (!event)
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* return;
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* entry = ring_buffer_event_data(event);
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*
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* <tstruct>; <-- Here we assign the entries by the TRACE_FIELD.
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*
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* trace_current_buffer_unlock_commit(event, irq_flags, pc);
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* }
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*
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* static int ftrace_raw_reg_event_<call>(void)
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* {
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* int ret;
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*
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* ret = register_trace_<call>(ftrace_raw_event_<call>);
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* if (!ret)
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* pr_info("event trace: Could not activate trace point "
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* "probe to <call>");
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* return ret;
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* }
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*
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* static void ftrace_unreg_event_<call>(void)
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* {
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* unregister_trace_<call>(ftrace_raw_event_<call>);
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* }
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*
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* static struct trace_event ftrace_event_type_<call> = {
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* .trace = ftrace_raw_output_<call>, <-- stage 2
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* };
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*
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* static int ftrace_raw_init_event_<call>(void)
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* {
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* int id;
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*
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* id = register_ftrace_event(&ftrace_event_type_<call>);
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* if (!id)
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* return -ENODEV;
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* event_<call>.id = id;
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* return 0;
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* }
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*
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* static struct ftrace_event_call __used
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* __attribute__((__aligned__(4)))
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* __attribute__((section("_ftrace_events"))) event_<call> = {
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* .name = "<call>",
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* .regfunc = ftrace_reg_event_<call>,
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* .unregfunc = ftrace_unreg_event_<call>,
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* .raw_init = ftrace_raw_init_event_<call>,
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* .raw_reg = ftrace_raw_reg_event_<call>,
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* .raw_unreg = ftrace_raw_unreg_event_<call>,
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* .show_format = ftrace_format_<call>,
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* }
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*
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*/
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#undef TP_FMT
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#define TP_FMT(fmt, args...) fmt "\n", ##args
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#define _TRACE_FORMAT(call, proto, args, fmt) \
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static void ftrace_event_##call(proto) \
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{ \
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event_trace_printk(_RET_IP_, #call ": " fmt); \
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} \
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\
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static int ftrace_reg_event_##call(void) \
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{ \
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int ret; \
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\
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ret = register_trace_##call(ftrace_event_##call); \
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if (ret) \
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pr_info("event trace: Could not activate trace point " \
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"probe to " #call "\n"); \
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return ret; \
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} \
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\
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static void ftrace_unreg_event_##call(void) \
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{ \
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unregister_trace_##call(ftrace_event_##call); \
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} \
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#undef TRACE_FORMAT
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#define TRACE_FORMAT(call, proto, args, fmt) \
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_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
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static struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.system = STR(TRACE_SYSTEM), \
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.regfunc = ftrace_reg_event_##call, \
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.unregfunc = ftrace_unreg_event_##call, \
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}
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TP_CMD
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#define TP_CMD(cmd...) cmd
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#undef TRACE_ENTRY
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#define TRACE_ENTRY entry
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
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cmd;
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
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\
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static struct ftrace_event_call event_##call; \
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\
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static void ftrace_raw_event_##call(proto) \
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{ \
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struct ring_buffer_event *event; \
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struct ftrace_raw_##call *entry; \
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unsigned long irq_flags; \
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int pc; \
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\
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local_save_flags(irq_flags); \
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pc = preempt_count(); \
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\
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event = trace_current_buffer_lock_reserve(event_##call.id, \
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sizeof(struct ftrace_raw_##call), \
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irq_flags, pc); \
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if (!event) \
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return; \
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entry = ring_buffer_event_data(event); \
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\
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tstruct; \
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\
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trace_current_buffer_unlock_commit(event, irq_flags, pc); \
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} \
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\
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static int ftrace_raw_reg_event_##call(void) \
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{ \
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int ret; \
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\
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ret = register_trace_##call(ftrace_raw_event_##call); \
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if (ret) \
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pr_info("event trace: Could not activate trace point " \
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"probe to " #call "\n"); \
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return ret; \
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} \
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\
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static void ftrace_raw_unreg_event_##call(void) \
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{ \
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unregister_trace_##call(ftrace_raw_event_##call); \
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} \
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\
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static struct trace_event ftrace_event_type_##call = { \
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.trace = ftrace_raw_output_##call, \
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}; \
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\
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static int ftrace_raw_init_event_##call(void) \
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{ \
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int id; \
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\
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id = register_ftrace_event(&ftrace_event_type_##call); \
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if (!id) \
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return -ENODEV; \
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event_##call.id = id; \
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return 0; \
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} \
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\
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static struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.system = STR(TRACE_SYSTEM), \
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.regfunc = ftrace_reg_event_##call, \
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.unregfunc = ftrace_unreg_event_##call, \
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.raw_init = ftrace_raw_init_event_##call, \
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.raw_reg = ftrace_raw_reg_event_##call, \
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.raw_unreg = ftrace_raw_unreg_event_##call, \
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.show_format = ftrace_format_##call, \
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}
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