9b63776fa3
With the adding of function tracing event to perf, it caused a side effect that produces the following warning when enabling all events in ftrace: # echo 1 > /sys/kernel/debug/tracing/events/enable [console] event trace: Could not enable event function This is because when enabling all events via the debugfs system it ignores events that do not have a ->reg() function assigned. This was to skip over the ftrace internal events (as they are not TRACE_EVENTs). But as the ftrace function event now has a ->reg() function attached to it for use with perf, it is no longer ignored. Worse yet, this ->reg() function is being called when it should not be. It returns an error and causes the above warning to be printed. By adding a new event_call flag (TRACE_EVENT_FL_IGNORE_ENABLE) and have all ftrace internel event structures have it set, setting the events/enable will no longe try to incorrectly enable the function event and does not warn. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
199 lines
5.3 KiB
C
199 lines
5.3 KiB
C
/*
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* trace_export.c - export basic ftrace utilities to user space
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*
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* Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
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*/
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#include <linux/stringify.h>
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#include <linux/kallsyms.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/ftrace.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include "trace_output.h"
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM ftrace
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/*
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* The FTRACE_ENTRY_REG macro allows ftrace entry to define register
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* function and thus become accesible via perf.
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*/
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#undef FTRACE_ENTRY_REG
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#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
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filter, regfn) \
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
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filter)
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/* not needed for this file */
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __field
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#define __field(type, item) type item;
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#undef __field_desc
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#define __field_desc(type, container, item) type item;
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#undef __array
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#define __array(type, item, size) type item[size];
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#undef __array_desc
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#define __array_desc(type, container, item, size) type item[size];
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#undef __dynamic_array
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#define __dynamic_array(type, item) type item[];
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#undef F_STRUCT
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#define F_STRUCT(args...) args
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#undef F_printk
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#define F_printk(fmt, args...) fmt, args
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#undef FTRACE_ENTRY
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
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struct ____ftrace_##name { \
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tstruct \
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}; \
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static void __always_unused ____ftrace_check_##name(void) \
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{ \
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struct ____ftrace_##name *__entry = NULL; \
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\
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/* force compile-time check on F_printk() */ \
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printk(print); \
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}
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#undef FTRACE_ENTRY_DUP
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#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
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filter)
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#include "trace_entries.h"
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#undef __field
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#define __field(type, item) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), \
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is_signed_type(type), filter_type); \
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if (ret) \
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return ret;
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#undef __field_desc
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#define __field_desc(type, container, item) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), \
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container.item), \
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sizeof(field.container.item), \
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is_signed_type(type), filter_type); \
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if (ret) \
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return ret;
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#undef __array
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#define __array(type, item, len) \
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do { \
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BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
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mutex_lock(&event_storage_mutex); \
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snprintf(event_storage, sizeof(event_storage), \
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"%s[%d]", #type, len); \
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ret = trace_define_field(event_call, event_storage, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), \
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is_signed_type(type), filter_type); \
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mutex_unlock(&event_storage_mutex); \
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if (ret) \
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return ret; \
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} while (0);
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#undef __array_desc
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#define __array_desc(type, container, item, len) \
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BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
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ret = trace_define_field(event_call, #type "[" #len "]", #item, \
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offsetof(typeof(field), \
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container.item), \
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sizeof(field.container.item), \
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is_signed_type(type), filter_type); \
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if (ret) \
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return ret;
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#undef __dynamic_array
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#define __dynamic_array(type, item) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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0, is_signed_type(type), filter_type);\
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if (ret) \
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return ret;
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#undef FTRACE_ENTRY
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
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int \
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ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
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{ \
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struct struct_name field; \
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int ret; \
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int filter_type = filter; \
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\
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tstruct; \
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\
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return ret; \
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}
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#include "trace_entries.h"
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#undef __entry
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#define __entry REC
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#undef __field
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#define __field(type, item)
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#undef __field_desc
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#define __field_desc(type, container, item)
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#undef __array
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#define __array(type, item, len)
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#undef __array_desc
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#define __array_desc(type, container, item, len)
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#undef __dynamic_array
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#define __dynamic_array(type, item)
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#undef F_printk
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#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
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#undef FTRACE_ENTRY_REG
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#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
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regfn) \
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\
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struct ftrace_event_class event_class_ftrace_##call = { \
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.system = __stringify(TRACE_SYSTEM), \
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.define_fields = ftrace_define_fields_##call, \
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.fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
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.reg = regfn, \
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}; \
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\
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struct ftrace_event_call __used event_##call = { \
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.name = #call, \
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.event.type = etype, \
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.class = &event_class_ftrace_##call, \
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.print_fmt = print, \
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.flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
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}; \
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struct ftrace_event_call __used \
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__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
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#undef FTRACE_ENTRY
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#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
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FTRACE_ENTRY_REG(call, struct_name, etype, \
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PARAMS(tstruct), PARAMS(print), filter, NULL)
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int ftrace_event_is_function(struct ftrace_event_call *call)
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{
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return call == &event_function;
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}
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#include "trace_entries.h"
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