Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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"