forked from Minki/linux
d0ee8f4a1f
The name "ftrace" really refers to the function hook infrastructure. It is not about the trace_events. The function ftrace_get_offsets_##call() is used to find the offset into dynamically allocated trace event fields for printing. It has nothing to do with function tracing. Rename it. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
351 lines
10 KiB
C
351 lines
10 KiB
C
/*
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* Stage 4 of the trace events.
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*
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* Override the macros in <trace/trace_events.h> to include the following:
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*
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* For those macros defined with TRACE_EVENT:
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*
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* static struct trace_event_call event_<call>;
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*
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* static void trace_event_raw_event_<call>(void *__data, proto)
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* {
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* struct trace_event_file *trace_file = __data;
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* struct trace_event_call *event_call = trace_file->event_call;
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* struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
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* unsigned long eflags = trace_file->flags;
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* enum event_trigger_type __tt = ETT_NONE;
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* struct ring_buffer_event *event;
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* struct trace_event_raw_<call> *entry; <-- defined in stage 1
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* struct ring_buffer *buffer;
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* unsigned long irq_flags;
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* int __data_size;
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* int pc;
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*
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* if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
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* if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
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* event_triggers_call(trace_file, NULL);
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* if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
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* return;
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* }
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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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* __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
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*
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* event = trace_event_buffer_lock_reserve(&buffer, trace_file,
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* event_<call>->event.type,
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* sizeof(*entry) + __data_size,
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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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* { <assign>; } <-- Here we assign the entries by the __field and
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* __array macros.
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*
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* if (eflags & EVENT_FILE_FL_TRIGGER_COND)
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* __tt = event_triggers_call(trace_file, entry);
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*
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* if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
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* &trace_file->flags))
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* ring_buffer_discard_commit(buffer, event);
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* else if (!filter_check_discard(trace_file, entry, buffer, event))
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* trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
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*
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* if (__tt)
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* event_triggers_post_call(trace_file, __tt);
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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 = trace_raw_output_<call>, <-- stage 2
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* };
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*
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* static char print_fmt_<call>[] = <TP_printk>;
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*
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* static struct trace_event_class __used event_class_<template> = {
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* .system = "<system>",
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* .define_fields = trace_event_define_fields_<call>,
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* .fields = LIST_HEAD_INIT(event_class_##call.fields),
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* .raw_init = trace_event_raw_init,
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* .probe = trace_event_raw_event_##call,
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* .reg = trace_event_reg,
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* };
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*
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* static struct trace_event_call event_<call> = {
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* .class = event_class_<template>,
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* {
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* .tp = &__tracepoint_<call>,
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* },
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* .event = &ftrace_event_type_<call>,
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* .print_fmt = print_fmt_<call>,
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* .flags = TRACE_EVENT_FL_TRACEPOINT,
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* };
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* // its only safe to use pointers when doing linker tricks to
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* // create an array.
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* static struct trace_event_call __used
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* __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
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*
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*/
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#ifdef CONFIG_PERF_EVENTS
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#define _TRACE_PERF_PROTO(call, proto) \
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static notrace void \
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perf_trace_##call(void *__data, proto);
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#define _TRACE_PERF_INIT(call) \
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.perf_probe = perf_trace_##call,
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#else
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#define _TRACE_PERF_PROTO(call, proto)
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#define _TRACE_PERF_INIT(call)
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#endif /* CONFIG_PERF_EVENTS */
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#undef __entry
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#define __entry entry
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#undef __field
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#define __field(type, item)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __array
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#define __array(type, item, len)
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#undef __dynamic_array
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#define __dynamic_array(type, item, len) \
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__entry->__data_loc_##item = __data_offsets.item;
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1)
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#undef __assign_str
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#define __assign_str(dst, src) \
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strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
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#undef __bitmask
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#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
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#undef __get_bitmask
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#define __get_bitmask(field) (char *)__get_dynamic_array(field)
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#undef __assign_bitmask
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#define __assign_bitmask(dst, src, nr_bits) \
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memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
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#undef TP_fast_assign
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#define TP_fast_assign(args...) args
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#undef __perf_addr
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#define __perf_addr(a) (a)
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#undef __perf_count
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#define __perf_count(c) (c)
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#undef __perf_task
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#define __perf_task(t) (t)
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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\
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static notrace void \
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trace_event_raw_event_##call(void *__data, proto) \
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{ \
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struct trace_event_file *trace_file = __data; \
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struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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struct trace_event_buffer fbuffer; \
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struct trace_event_raw_##call *entry; \
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int __data_size; \
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\
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if (trace_trigger_soft_disabled(trace_file)) \
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return; \
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\
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__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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\
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entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
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sizeof(*entry) + __data_size); \
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\
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if (!entry) \
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return; \
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\
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tstruct \
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\
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{ assign; } \
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\
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trace_event_buffer_commit(&fbuffer); \
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}
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/*
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* The ftrace_test_probe is compiled out, it is only here as a build time check
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* to make sure that if the tracepoint handling changes, the ftrace probe will
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* fail to compile unless it too is updated.
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*/
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, call, proto, args) \
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static inline void ftrace_test_probe_##call(void) \
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{ \
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check_trace_callback_type_##call(trace_event_raw_event_##template); \
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}
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#undef __entry
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#define __entry REC
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#undef __print_flags
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#undef __print_symbolic
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#undef __print_hex
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#undef __get_dynamic_array
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#undef __get_dynamic_array_len
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#undef __get_str
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#undef __get_bitmask
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#undef __print_array
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#undef TP_printk
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#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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_TRACE_PERF_PROTO(call, PARAMS(proto)); \
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static char print_fmt_##call[] = print; \
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static struct trace_event_class __used __refdata event_class_##call = { \
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.system = TRACE_SYSTEM_STRING, \
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.define_fields = trace_event_define_fields_##call, \
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.fields = LIST_HEAD_INIT(event_class_##call.fields),\
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.raw_init = trace_event_raw_init, \
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.probe = trace_event_raw_event_##call, \
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.reg = trace_event_reg, \
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_TRACE_PERF_INIT(call) \
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};
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, call, proto, args) \
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\
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static struct trace_event_call __used event_##call = { \
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.class = &event_class_##template, \
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{ \
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.tp = &__tracepoint_##call, \
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}, \
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.event.funcs = &trace_event_type_funcs_##template, \
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.print_fmt = print_fmt_##template, \
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.flags = TRACE_EVENT_FL_TRACEPOINT, \
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}; \
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static struct trace_event_call __used \
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__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
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\
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static char print_fmt_##call[] = print; \
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\
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static struct trace_event_call __used event_##call = { \
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.class = &event_class_##template, \
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{ \
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.tp = &__tracepoint_##call, \
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}, \
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.event.funcs = &trace_event_type_funcs_##call, \
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.print_fmt = print_fmt_##call, \
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.flags = TRACE_EVENT_FL_TRACEPOINT, \
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}; \
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static struct trace_event_call __used \
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__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#undef TRACE_SYSTEM_VAR
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#ifdef CONFIG_PERF_EVENTS
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#undef __entry
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#define __entry entry
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#undef __get_dynamic_array
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#define __get_dynamic_array(field) \
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((void *)__entry + (__entry->__data_loc_##field & 0xffff))
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#undef __get_dynamic_array_len
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#define __get_dynamic_array_len(field) \
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((__entry->__data_loc_##field >> 16) & 0xffff)
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#undef __get_str
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#define __get_str(field) (char *)__get_dynamic_array(field)
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#undef __get_bitmask
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#define __get_bitmask(field) (char *)__get_dynamic_array(field)
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#undef __perf_addr
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#define __perf_addr(a) (__addr = (a))
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#undef __perf_count
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#define __perf_count(c) (__count = (c))
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#undef __perf_task
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#define __perf_task(t) (__task = (t))
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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static notrace void \
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perf_trace_##call(void *__data, proto) \
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{ \
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struct trace_event_call *event_call = __data; \
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struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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struct trace_event_raw_##call *entry; \
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struct pt_regs *__regs; \
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u64 __addr = 0, __count = 1; \
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struct task_struct *__task = NULL; \
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struct hlist_head *head; \
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int __entry_size; \
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int __data_size; \
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int rctx; \
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\
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__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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\
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head = this_cpu_ptr(event_call->perf_events); \
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if (__builtin_constant_p(!__task) && !__task && \
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hlist_empty(head)) \
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return; \
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\
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__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
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sizeof(u64)); \
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__entry_size -= sizeof(u32); \
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\
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entry = perf_trace_buf_prepare(__entry_size, \
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event_call->event.type, &__regs, &rctx); \
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if (!entry) \
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return; \
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\
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perf_fetch_caller_regs(__regs); \
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\
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tstruct \
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\
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{ assign; } \
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\
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perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
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__count, __regs, head, __task); \
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}
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/*
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* This part is compiled out, it is only here as a build time check
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* to make sure that if the tracepoint handling changes, the
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* perf probe will fail to compile unless it too is updated.
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*/
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, call, proto, args) \
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static inline void perf_test_probe_##call(void) \
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{ \
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check_trace_callback_type_##call(perf_trace_##template); \
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}
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#endif /* CONFIG_PERF_EVENTS */
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