diff options
Diffstat (limited to 'kernel/trace/trace_export.c')
| -rw-r--r-- | kernel/trace/trace_export.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c new file mode 100644 index 000000000..45630a76e --- /dev/null +++ b/kernel/trace/trace_export.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * trace_export.c - export basic ftrace utilities to user space + * + * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com> + */ +#include <linux/stringify.h> +#include <linux/kallsyms.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/ftrace.h> +#include <linux/module.h> +#include <linux/init.h> + +#include "trace_output.h" + +/* Stub function for events with triggers */ +static int ftrace_event_register(struct trace_event_call *call, + enum trace_reg type, void *data) +{ + return 0; +} + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM ftrace + +/* + * The FTRACE_ENTRY_REG macro allows ftrace entry to define register + * function and thus become accesible via perf. + */ +#undef FTRACE_ENTRY_REG +#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ + filter, regfn) \ + FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ + filter) + +/* not needed for this file */ +#undef __field_struct +#define __field_struct(type, item) + +#undef __field +#define __field(type, item) type item; + +#undef __field_desc +#define __field_desc(type, container, item) type item; + +#undef __array +#define __array(type, item, size) type item[size]; + +#undef __array_desc +#define __array_desc(type, container, item, size) type item[size]; + +#undef __dynamic_array +#define __dynamic_array(type, item) type item[]; + +#undef F_STRUCT +#define F_STRUCT(args...) args + +#undef F_printk +#define F_printk(fmt, args...) fmt, args + +#undef FTRACE_ENTRY +#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ +struct ____ftrace_##name { \ + tstruct \ +}; \ +static void __always_unused ____ftrace_check_##name(void) \ +{ \ + struct ____ftrace_##name *__entry = NULL; \ + \ + /* force compile-time check on F_printk() */ \ + printk(print); \ +} + +#undef FTRACE_ENTRY_DUP +#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \ + FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ + filter) + +#include "trace_entries.h" + +#undef __field +#define __field(type, item) \ + ret = trace_define_field(event_call, #type, #item, \ + offsetof(typeof(field), item), \ + sizeof(field.item), \ + is_signed_type(type), filter_type); \ + if (ret) \ + return ret; + +#undef __field_desc +#define __field_desc(type, container, item) \ + ret = trace_define_field(event_call, #type, #item, \ + offsetof(typeof(field), \ + container.item), \ + sizeof(field.container.item), \ + is_signed_type(type), filter_type); \ + if (ret) \ + return ret; + +#undef __array +#define __array(type, item, len) \ + do { \ + char *type_str = #type"["__stringify(len)"]"; \ + BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ + ret = trace_define_field(event_call, type_str, #item, \ + offsetof(typeof(field), item), \ + sizeof(field.item), \ + is_signed_type(type), filter_type); \ + if (ret) \ + return ret; \ + } while (0); + +#undef __array_desc +#define __array_desc(type, container, item, len) \ + BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ + ret = trace_define_field(event_call, #type "[" #len "]", #item, \ + offsetof(typeof(field), \ + container.item), \ + sizeof(field.container.item), \ + is_signed_type(type), filter_type); \ + if (ret) \ + return ret; + +#undef __dynamic_array +#define __dynamic_array(type, item) \ + ret = trace_define_field(event_call, #type "[]", #item, \ + offsetof(typeof(field), item), \ + 0, is_signed_type(type), filter_type);\ + if (ret) \ + return ret; + +#undef FTRACE_ENTRY +#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ +static int __init \ +ftrace_define_fields_##name(struct trace_event_call *event_call) \ +{ \ + struct struct_name field; \ + int ret; \ + int filter_type = filter; \ + \ + tstruct; \ + \ + return ret; \ +} + +#include "trace_entries.h" + +#undef __entry +#define __entry REC + +#undef __field +#define __field(type, item) + +#undef __field_desc +#define __field_desc(type, container, item) + +#undef __array +#define __array(type, item, len) + +#undef __array_desc +#define __array_desc(type, container, item, len) + +#undef __dynamic_array +#define __dynamic_array(type, item) + +#undef F_printk +#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) + +#undef FTRACE_ENTRY_REG +#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\ + regfn) \ + \ +struct trace_event_class __refdata event_class_ftrace_##call = { \ + .system = __stringify(TRACE_SYSTEM), \ + .define_fields = ftrace_define_fields_##call, \ + .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ + .reg = regfn, \ +}; \ + \ +struct trace_event_call __used event_##call = { \ + .class = &event_class_ftrace_##call, \ + { \ + .name = #call, \ + }, \ + .event.type = etype, \ + .print_fmt = print, \ + .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ +}; \ +struct trace_event_call __used \ +__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; + +#undef FTRACE_ENTRY +#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \ + FTRACE_ENTRY_REG(call, struct_name, etype, \ + PARAMS(tstruct), PARAMS(print), filter, NULL) + +bool ftrace_event_is_function(struct trace_event_call *call) +{ + return call == &event_function; +} + +#include "trace_entries.h" |