X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-events.h;h=dacce7bd287f0413da50861ac71de3a396e8d951;hb=f62b389ebaba6abc93afb2cf9fbdf2fe0b632077;hp=c5eeac28cbf8aea5fba345dbabcc3c73195cd2e3;hpb=0d1d4002e3a9e6de1a6d50932c5e38642dbce4f4;p=lttng-modules.git

diff --git a/probes/lttng-events.h b/probes/lttng-events.h
index c5eeac28..dacce7bd 100644
--- a/probes/lttng-events.h
+++ b/probes/lttng-events.h
@@ -1,33 +1,11 @@
 #include <lttng.h>
 #include <lttng-types.h>
 #include <linux/debugfs.h>
+#include "../wrapper/vmalloc.h"	/* for wrapper_vmalloc_sync_all() */
+#include "../wrapper/ringbuffer/frontend_types.h"
+#include "../ltt-events.h"
 #include "../ltt-tracer-core.h"
 
-#if 0
-
-/* keep for a later stage (copy stage) */
-/*
- * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
- * strcpy().
- */
-#undef tp_assign
-#define tp_assign(dest, src)						\
-	lib_ring_buffer_align_ctx(config, &ctx, sizeof(src));		\
-	lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
-
-#undef tp_memcpy
-#define tp_memcpy(dest, src, len)					\
-	lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src)));	\
-	lib_ring_buffer_write(config, &ctx, &src, len);
-
-/* TODO */
-#undef tp_strcpy
-#define tp_strcpy(dest, src)		__assign_str(dest, src);
-
-#endif //0
-
-/* TODO : deal with DEFINE_EVENT vs event class */
-
 struct lttng_event_field {
 	const char *name;
 	const struct lttng_type type;
@@ -36,6 +14,7 @@ struct lttng_event_field {
 struct lttng_event_desc {
 	const struct lttng_event_field *fields;
 	const char *name;
+	void *probe_callback;
 	unsigned int nr_fields;
 };
 
@@ -74,6 +53,28 @@ struct lttng_event_desc {
 	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
 		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
 
+/*
+ * Stage 0.1 of the trace events.
+ *
+ * Create dummy trace calls for each events, verifying that the LTTng module
+ * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
+ * compiler.
+ */
+
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
+
+#undef TP_PROTO
+#define TP_PROTO(args...) args
+
+#undef TP_ARGS
+#define TP_ARGS(args...) args
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(_template, _name, _proto, _args)			\
+void trace_##_name(proto);
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
 /*
  * Stage 1 of the trace events.
  *
@@ -138,6 +139,23 @@ struct lttng_event_desc {
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
+/*
+ * Stage 1.1 of the trace events.
+ *
+ * Create probe callback prototypes.
+ */
+
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
+
+#undef TP_PROTO
+#define TP_PROTO(args...) args
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
+static void __event_probe__##_name(void *__data, _proto);
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
 /*
  * Stage 2 of the trace events.
  *
@@ -148,12 +166,13 @@ struct lttng_event_desc {
 
 #include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
 
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
-		{							     \
-			.fields = __event_fields___##_name,		     \
-			.name = #_name,					     \
-			.nr_fields = ARRAY_SIZE(__event_fields___##_name),   \
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(_template, _name, _proto, _args)			       \
+		{							       \
+			.fields = __event_fields___##_template,		       \
+			.name = #_name,					       \
+			.probe_callback = (void *) &__event_probe__##_template,\
+			.nr_fields = ARRAY_SIZE(__event_fields___##_template), \
 		},
 
 #define TP_ID1(_token, _system)	_token##_system
@@ -174,10 +193,6 @@ static const struct lttng_event_desc TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
 
 #define TP_ID1(_token, _system)	_token##_system
 #define TP_ID(_token, _system)	TP_ID1(_token, _system)
-#define module_init_eval1(_token, _system)	module_init(_token##_system)
-#define module_init_eval(_token, _system)	module_init_eval1(_token, _system)
-#define module_exit_eval1(_token, _system)	module_exit(_token##_system)
-#define module_exit_eval(_token, _system)	module_exit_eval1(_token, _system)
 
 static void *TP_ID(__lttng_seq_start__, TRACE_SYSTEM)(struct seq_file *m,
 						      loff_t *pos)
@@ -275,21 +290,14 @@ error:
 	return ret;
 }
 
-module_init_eval(__lttng_types_init__, TRACE_SYSTEM);
-
 static void TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(void)
 {
 	debugfs_remove(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM));
 }
 
-module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM);
-
-#undef module_init_eval
-#undef module_exit_eval
 #undef TP_ID1
 #undef TP_ID
 
-
 /*
  * Stage 4 of the trace events.
  *
@@ -301,27 +309,27 @@ module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM);
 /* Named field types must be defined in lttng-types.h */
 
 #undef __field
-#define __field(_type, _item)						  \
-	__event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
+#define __field(_type, _item)						       \
+	__event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \
 	__event_len += sizeof(_type);
 
 #undef __field_ext
 #define __field_ext(_type, _item, _filter_type)	__field(_type, _item)
 
 #undef __array
-#define __array(_type, _item, _length)					  \
-	__event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
+#define __array(_type, _item, _length)					       \
+	__event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \
 	__event_len += sizeof(_type) * (_length);
 
 #undef __dynamic_array
-#define __dynamic_array(_type, _item, _length)				  \
-	__event_len += lib_ring_buffer_align(__event_len, sizeof(u32));	  \
-	__event_len += sizeof(u32);					  \
-	__event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
+#define __dynamic_array(_type, _item, _length)				       \
+	__event_len += lib_ring_buffer_align(__event_len, __alignof__(u32));   \
+	__event_len += sizeof(u32);					       \
+	__event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \
 	__event_len += sizeof(_type) * (_length);
 
 #undef __string
-#define __string(_item, _src)						\
+#define __string(_item, _src)						       \
 	__event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 
 #undef TP_PROTO
@@ -346,707 +354,290 @@ static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
 
-#if 0
 
 /*
- * Stage 4 of the trace events.
+ * Stage 5 of the trace events.
  *
- * Create the probe function : call even size calculation and write event data
- * into the buffer.
+ * Create static inline function that calculates event payload alignment.
  */
 
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
 
-
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
-
-
-
-
-#include <linux/ftrace_event.h>
-
-/*
- * DECLARE_EVENT_CLASS can be used to add a generic function
- * handlers for events. That is, if all events have the same
- * parameters and just have distinct trace points.
- * Each tracepoint can be defined with DEFINE_EVENT and that
- * will map the DECLARE_EVENT_CLASS to the tracepoint.
- *
- * TRACE_EVENT is a one to one mapping between tracepoint and template.
- */
-#undef TRACE_EVENT
-#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
-	DECLARE_EVENT_CLASS(name,			       \
-			     PARAMS(proto),		       \
-			     PARAMS(args),		       \
-			     PARAMS(tstruct),		       \
-			     PARAMS(assign),		       \
-			     PARAMS(print));		       \
-	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
-
+/* Named field types must be defined in lttng-types.h */
 
 #undef __field
-#define __field(type, item)		type	item;
+#define __field(_type, _item)						  \
+	__event_align = max_t(size_t, __event_align, __alignof__(_type));
 
 #undef __field_ext
-#define __field_ext(type, item, filter_type)	type	item;
+#define __field_ext(_type, _item, _filter_type)	__field(_type, _item)
 
 #undef __array
-#define __array(type, item, len)	type	item[len];
+#define __array(_type, _item, _length)					  \
+	__event_align = max_t(size_t, __event_align, __alignof__(_type));
 
 #undef __dynamic_array
-#define __dynamic_array(type, item, len) u32 __data_loc_##item;
+#define __dynamic_array(_type, _item, _length)				  \
+	__event_align = max_t(size_t, __event_align, __alignof__(u32));	  \
+	__event_align = max_t(size_t, __event_align, __alignof__(_type));
 
 #undef __string
-#define __string(item, src) __dynamic_array(char, item, -1)
+#define __string(_item, _src)
+
+#undef TP_PROTO
+#define TP_PROTO(args...) args
 
 #undef TP_STRUCT__entry
 #define TP_STRUCT__entry(args...) args
 
 #undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
-	struct ftrace_raw_##name {					\
-		struct trace_entry	ent;				\
-		tstruct							\
-		char			__data[0];			\
-	};								\
-									\
-	static struct ftrace_event_class event_class_##name;
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, name, proto, args)	\
-	static struct ftrace_event_call	__used		\
-	__attribute__((__aligned__(4))) event_##name
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
-	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
-
-/* Callbacks are meaningless to ftrace. */
-#undef TRACE_EVENT_FN
-#define TRACE_EVENT_FN(name, proto, args, tstruct,			\
-		assign, print, reg, unreg)				\
-	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
-		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
+#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
+static inline size_t __event_get_align__##_name(_proto)			      \
+{									      \
+	size_t __event_align = 1;					      \
+	_tstruct							      \
+	return __event_align;						      \
+}
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
 
 /*
- * Stage 2 of the trace events.
+ * Stage 6 of the trace events.
  *
- * Create static inline function that calculates event size.
+ * Create structure declaration that allows the "assign" macros to access the
+ * field types.
  */
 
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
+
+/* Named field types must be defined in lttng-types.h */
+
 #undef __field
-#define __field(type, item)
+#define __field(_type, _item)	_type	_item;
 
 #undef __field_ext
-#define __field_ext(type, item, filter_type)
+#define __field_ext(_type, _item, _filter_type)	__field(_type, _item)
 
 #undef __array
-#define __array(type, item, len)
+#define __array(_type, _item, _length)	_type	_item;
 
 #undef __dynamic_array
-#define __dynamic_array(type, item, len)	u32 item;
+#define __dynamic_array(_type, _item, _length)	_type	_item;
 
 #undef __string
-#define __string(item, src) __dynamic_array(char, item, -1)
-
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-	struct ftrace_data_offsets_##call {				\
-		tstruct;						\
-	};
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, name, proto, args)
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
-	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
-
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
-
-/*
- * Stage 3 of the trace events.
- *
- * Create the probe function : call even size calculation and write event data
- * into the buffer.
- */
+#define __string(_item, _src)	char _item;
 
-#undef __entry
-#define __entry field
-
-#undef TP_printk
-#define TP_printk(fmt, args...) fmt "\n", args
-
-#undef __get_dynamic_array
-#define __get_dynamic_array(field)	\
-		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
-
-#undef __get_str
-#define __get_str(field) (char *)__get_dynamic_array(field)
-
-#undef __print_flags
-#define __print_flags(flag, delim, flag_array...)			\
-	({								\
-		static const struct trace_print_flags __flags[] =	\
-			{ flag_array, { -1, NULL }};			\
-		ftrace_print_flags_seq(p, delim, flag, __flags);	\
-	})
-
-#undef __print_symbolic
-#define __print_symbolic(value, symbol_array...)			\
-	({								\
-		static const struct trace_print_flags symbols[] =	\
-			{ symbol_array, { -1, NULL }};			\
-		ftrace_print_symbols_seq(p, value, symbols);		\
-	})
-
-#undef __print_hex
-#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
 
 #undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-static notrace enum print_line_t					\
-ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
-			 struct trace_event *trace_event)		\
-{									\
-	struct ftrace_event_call *event;				\
-	struct trace_seq *s = &iter->seq;				\
-	struct ftrace_raw_##call *field;				\
-	struct trace_entry *entry;					\
-	struct trace_seq *p = &iter->tmp_seq;				\
-	int ret;							\
-									\
-	event = container_of(trace_event, struct ftrace_event_call,	\
-			     event);					\
-									\
-	entry = iter->ent;						\
-									\
-	if (entry->type != event->event.type) {				\
-		WARN_ON_ONCE(1);					\
-		return TRACE_TYPE_UNHANDLED;				\
-	}								\
-									\
-	field = (typeof(field))entry;					\
-									\
-	trace_seq_init(p);						\
-	ret = trace_seq_printf(s, "%s: ", event->name);			\
-	if (ret)							\
-		ret = trace_seq_printf(s, print);			\
-	if (!ret)							\
-		return TRACE_TYPE_PARTIAL_LINE;				\
-									\
-	return TRACE_TYPE_HANDLED;					\
-}									\
-static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
-	.trace			= ftrace_raw_output_##call,		\
-};
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
-static notrace enum print_line_t					\
-ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
-			 struct trace_event *event)			\
-{									\
-	struct trace_seq *s = &iter->seq;				\
-	struct ftrace_raw_##template *field;				\
-	struct trace_entry *entry;					\
-	struct trace_seq *p = &iter->tmp_seq;				\
-	int ret;							\
-									\
-	entry = iter->ent;						\
-									\
-	if (entry->type != event_##call.event.type) {			\
-		WARN_ON_ONCE(1);					\
-		return TRACE_TYPE_UNHANDLED;				\
-	}								\
-									\
-	field = (typeof(field))entry;					\
-									\
-	trace_seq_init(p);						\
-	ret = trace_seq_printf(s, "%s: ", #call);			\
-	if (ret)							\
-		ret = trace_seq_printf(s, print);			\
-	if (!ret)							\
-		return TRACE_TYPE_PARTIAL_LINE;				\
-									\
-	return TRACE_TYPE_HANDLED;					\
-}									\
-static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
-	.trace			= ftrace_raw_output_##call,		\
+#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
+struct __event_typemap__##_name {					      \
+	_tstruct							      \
 };
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#undef __field_ext
-#define __field_ext(type, item, filter_type)				\
-	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
-#define __field(type, item)	__field_ext(type, item, FILTER_OTHER)
-
-#undef __array
-#define __array(type, item, len)					\
-	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\
-	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\
-				 offsetof(typeof(field), item),		\
-				 sizeof(field.item),			\
-				 is_signed_type(type), FILTER_OTHER);	\
-	if (ret)							\
-		return ret;
-
-#undef __dynamic_array
-#define __dynamic_array(type, item, len)				       \
-	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
-				 offsetof(typeof(field), __data_loc_##item),   \
-				 sizeof(field.__data_loc_##item),	       \
-				 is_signed_type(type), FILTER_OTHER);
-
-#undef __string
-#define __string(item, src) __dynamic_array(char, item, -1)
-
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
-static int notrace							\
-ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
-{									\
-	struct ftrace_raw_##call field;					\
-	int ret;							\
-									\
-	tstruct;							\
-									\
-	return ret;							\
-}
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, name, proto, args)
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
-	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
-
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
 /*
- * remember the offset of each array from the beginning of the event.
+ * Stage 7 of the trace events.
+ *
+ * Create the probe function : call even size calculation and write event data
+ * into the buffer.
+ *
+ * We use both the field and assignment macros to write the fields in the order
+ * defined in the field declaration. The field declarations control the
+ * execution order, jumping to the appropriate assignment block.
  */
 
-#undef __entry
-#define __entry entry
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
 
 #undef __field
-#define __field(type, item)
+#define __field(_type, _item)						\
+	goto __assign_##_item;						\
+__end_field_##_item:
 
 #undef __field_ext
-#define __field_ext(type, item, filter_type)
+#define __field_ext(_type, _item, _filter_type)	__field(_type, _item)
 
 #undef __array
-#define __array(type, item, len)
+#define __array(_type, _item, _length)					\
+	goto __assign_##_item;						\
+__end_field_##_item:
 
 #undef __dynamic_array
-#define __dynamic_array(type, item, len)				\
-	__data_offsets->item = __data_size +				\
-			       offsetof(typeof(*entry), __data);	\
-	__data_offsets->item |= (len * sizeof(type)) << 16;		\
-	__data_size += (len) * sizeof(type);
+#define __dynamic_array(_type, _item, _length)				\
+	goto __assign_##_item##_1;					\
+__end_field_##_item##_1:						\
+	goto __assign_##_item##_2;					\
+__end_field_##_item##_2:
 
 #undef __string
-#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
-
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-static inline notrace int ftrace_get_offsets_##call(			\
-	struct ftrace_data_offsets_##call *__data_offsets, proto)       \
-{									\
-	int __data_size = 0;						\
-	struct ftrace_raw_##call __maybe_unused *entry;			\
-									\
-	tstruct;							\
-									\
-	return __data_size;						\
-}
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, name, proto, args)
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
-	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
-
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+#define __string(_item, _src)						\
+	goto __assign_##_item;						\
+__end_field_##_item:
 
 /*
- * Stage 4 of the trace events.
- *
- * Override the macros in <trace/trace_events.h> to include the following:
- *
- * For those macros defined with TRACE_EVENT:
- *
- * static struct ftrace_event_call event_<call>;
- *
- * static void ftrace_raw_event_<call>(void *__data, proto)
- * {
- *	struct ftrace_event_call *event_call = __data;
- *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
- *	struct ring_buffer_event *event;
- *	struct ftrace_raw_<call> *entry; <-- defined in stage 1
- *	struct ring_buffer *buffer;
- *	unsigned long irq_flags;
- *	int __data_size;
- *	int pc;
- *
- *	local_save_flags(irq_flags);
- *	pc = preempt_count();
- *
- *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
- *
- *	event = trace_current_buffer_lock_reserve(&buffer,
- *				  event_<call>->event.type,
- *				  sizeof(*entry) + __data_size,
- *				  irq_flags, pc);
- *	if (!event)
- *		return;
- *	entry	= ring_buffer_event_data(event);
- *
- *	{ <assign>; }  <-- Here we assign the entries by the __field and
- *			   __array macros.
- *
- *	if (!filter_current_check_discard(buffer, event_call, entry, event))
- *		trace_current_buffer_unlock_commit(buffer,
- *						   event, irq_flags, pc);
- * }
- *
- * static struct trace_event ftrace_event_type_<call> = {
- *	.trace			= ftrace_raw_output_<call>, <-- stage 2
- * };
- *
- * static const char print_fmt_<call>[] = <TP_printk>;
- *
- * static struct ftrace_event_class __used event_class_<template> = {
- *	.system			= "<system>",
- *	.define_fields		= ftrace_define_fields_<call>,
- *	.fields			= LIST_HEAD_INIT(event_class_##call.fields),
- *	.raw_init		= trace_event_raw_init,
- *	.probe			= ftrace_raw_event_##call,
- *	.reg			= ftrace_event_reg,
- * };
- *
- * static struct ftrace_event_call __used
- * __attribute__((__aligned__(4)))
- * __attribute__((section("_ftrace_events"))) event_<call> = {
- *	.name			= "<call>",
- *	.class			= event_class_<template>,
- *	.event			= &ftrace_event_type_<call>,
- *	.print_fmt		= print_fmt_<call>,
- * };
- *
+ * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
+ * strcpy().
  */
+#undef tp_assign
+#define tp_assign(dest, src)						\
+__assign_##dest:							\
+	{								\
+		__typeof__(__typemap.dest) __tmp = (src);		\
+		lib_ring_buffer_align_ctx(&ctx, __alignof__(__tmp));	\
+		__chan->ops->event_write(&ctx, &__tmp, sizeof(__tmp));	\
+	}								\
+	goto __end_field_##dest;
 
-#ifdef CONFIG_PERF_EVENTS
-
-#define _TRACE_PERF_PROTO(call, proto)					\
-	static notrace void						\
-	perf_trace_##call(void *__data, proto);
+#undef tp_memcpy
+#define tp_memcpy(dest, src, len)					\
+__assign_##dest:							\
+	lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest));	\
+	__chan->ops->event_write(&ctx, src, len);			\
+	goto __end_field_##dest;
+
+#undef tp_memcpy_dyn
+#define tp_memcpy_dyn(dest, src, len)					\
+__assign_##dest##_1:							\
+	{								\
+		u32 __tmpl = (len);					\
+		lib_ring_buffer_align_ctx(&ctx, __alignof__(u32));	\
+		__chan->ops->event_write(&ctx, &__tmpl, sizeof(u32));	\
+	}								\
+	goto __end_field_##dest##_1;					\
+__assign_##dest##_2:							\
+	lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest));	\
+	__chan->ops->event_write(&ctx, src, len);			\
+	goto __end_field_##dest##_2;
 
-#define _TRACE_PERF_INIT(call)						\
-	.perf_probe		= perf_trace_##call,
+#undef tp_strcpy
+#define tp_strcpy(dest, src)						\
+	tp_memcpy(dest, src, __get_dynamic_array_len(dest))
 
-#else
-#define _TRACE_PERF_PROTO(call, proto)
-#define _TRACE_PERF_INIT(call)
-#endif /* CONFIG_PERF_EVENTS */
+/* Named field types must be defined in lttng-types.h */
 
-#undef __entry
-#define __entry entry
+#undef __get_str
+#define __get_str(field)		field
 
-#undef __field
-#define __field(type, item)
+#undef __get_dynamic_array
+#define __get_dynamic_array(field)	field
 
-#undef __array
-#define __array(type, item, len)
+/* Beware: this get len actually consumes the len value */
+#undef __get_dynamic_array_len
+#define __get_dynamic_array_len(field)	__dynamic_len[__dynamic_len_idx++]
 
-#undef __dynamic_array
-#define __dynamic_array(type, item, len)				\
-	__entry->__data_loc_##item = __data_offsets.item;
+#undef TP_PROTO
+#define TP_PROTO(args...) args
 
-#undef __string
-#define __string(item, src) __dynamic_array(char, item, -1)       	\
+#undef TP_ARGS
+#define TP_ARGS(args...) args
 
-#undef __assign_str
-#define __assign_str(dst, src)						\
-	strcpy(__get_str(dst), src);
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
 
 #undef TP_fast_assign
 #define TP_fast_assign(args...) args
 
-#undef TP_perf_assign
-#define TP_perf_assign(args...)
-
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-									\
-static notrace void							\
-ftrace_raw_event_##call(void *__data, proto)				\
-{									\
-	struct ftrace_event_call *event_call = __data;			\
-	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
-	struct ring_buffer_event *event;				\
-	struct ftrace_raw_##call *entry;				\
-	struct ring_buffer *buffer;					\
-	unsigned long irq_flags;					\
-	int __data_size;						\
-	int pc;								\
-									\
-	local_save_flags(irq_flags);					\
-	pc = preempt_count();						\
-									\
-	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
-									\
-	event = trace_current_buffer_lock_reserve(&buffer,		\
-				 event_call->event.type,		\
-				 sizeof(*entry) + __data_size,		\
-				 irq_flags, pc);			\
-	if (!event)							\
-		return;							\
-	entry	= ring_buffer_event_data(event);			\
-									\
-	tstruct								\
-									\
-	{ assign; }							\
-									\
-	if (!filter_current_check_discard(buffer, event_call, entry, event)) \
-		trace_nowake_buffer_unlock_commit(buffer,		\
-						  event, irq_flags, pc); \
-}
-/*
- * The ftrace_test_probe is compiled out, it is only here as a build time check
- * to make sure that if the tracepoint handling changes, the ftrace probe will
- * fail to compile unless it too is updated.
- */
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, call, proto, args)			\
-static inline void ftrace_test_probe_##call(void)			\
-{									\
-	check_trace_callback_type_##call(ftrace_raw_event_##template);	\
-}
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
-
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
-
-#undef __entry
-#define __entry REC
-
-#undef __print_flags
-#undef __print_symbolic
-#undef __get_dynamic_array
-#undef __get_str
-
-#undef TP_printk
-#define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
-
 #undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-_TRACE_PERF_PROTO(call, PARAMS(proto));					\
-static const char print_fmt_##call[] = print;				\
-static struct ftrace_event_class __used event_class_##call = {		\
-	.system			= __stringify(TRACE_SYSTEM),		\
-	.define_fields		= ftrace_define_fields_##call,		\
-	.fields			= LIST_HEAD_INIT(event_class_##call.fields),\
-	.raw_init		= trace_event_raw_init,			\
-	.probe			= ftrace_raw_event_##call,		\
-	.reg			= ftrace_event_reg,			\
-	_TRACE_PERF_INIT(call)						\
-};
-
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, call, proto, args)			\
-									\
-static struct ftrace_event_call __used					\
-__attribute__((__aligned__(4)))						\
-__attribute__((section("_ftrace_events"))) event_##call = {		\
-	.name			= #call,				\
-	.class			= &event_class_##template,		\
-	.event.funcs		= &ftrace_event_type_funcs_##template,	\
-	.print_fmt		= print_fmt_##template,			\
-};
-
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
-									\
-static const char print_fmt_##call[] = print;				\
-									\
-static struct ftrace_event_call __used					\
-__attribute__((__aligned__(4)))						\
-__attribute__((section("_ftrace_events"))) event_##call = {		\
-	.name			= #call,				\
-	.class			= &event_class_##template,		\
-	.event.funcs		= &ftrace_event_type_funcs_##call,	\
-	.print_fmt		= print_fmt_##call,			\
+#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
+static void __event_probe__##_name(void *__data, _proto)		      \
+{									      \
+	struct ltt_event *__event = __data;				      \
+	struct ltt_channel *__chan = __event->chan;			      \
+	struct lib_ring_buffer_ctx ctx;					      \
+	size_t __event_len, __event_align;				      \
+	size_t __dynamic_len_idx = 0;					      \
+	size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)];	      \
+	struct __event_typemap__##_name __typemap;			      \
+	int __ret;							      \
+									      \
+	if (0)								      \
+		(void) __dynamic_len_idx;	/* don't warn if unused */    \
+	if (!ACCESS_ONCE(__chan->session->active))			      \
+		return;							      \
+	__event_len = __event_get_size__##_name(__dynamic_len, _args);	      \
+	__event_align = __event_get_align__##_name(_args);		      \
+	lib_ring_buffer_ctx_init(&ctx, __chan->chan, NULL, __event_len,	      \
+				 __event_align, -1);			      \
+	__ret = __chan->ops->event_reserve(&ctx);			      \
+	if (__ret < 0)							      \
+		return;							      \
+	/* Control code (field ordering) */				      \
+	_tstruct							      \
+	__chan->ops->event_commit(&ctx);				      \
+	return;								      \
+	/* Copy code, steered by control code */			      \
+	_assign								      \
 }
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
 /*
- * Define the insertion callback to perf events
- *
- * The job is very similar to ftrace_raw_event_<call> except that we don't
- * insert in the ring buffer but in a perf counter.
- *
- * static void ftrace_perf_<call>(proto)
- * {
- *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
- *	struct ftrace_event_call *event_call = &event_<call>;
- *	extern void perf_tp_event(int, u64, u64, void *, int);
- *	struct ftrace_raw_##call *entry;
- *	struct perf_trace_buf *trace_buf;
- *	u64 __addr = 0, __count = 1;
- *	unsigned long irq_flags;
- *	struct trace_entry *ent;
- *	int __entry_size;
- *	int __data_size;
- *	int __cpu
- *	int pc;
- *
- *	pc = preempt_count();
- *
- *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
- *
- *	// Below we want to get the aligned size by taking into account
- *	// the u32 field that will later store the buffer size
- *	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
- *			     sizeof(u64));
- *	__entry_size -= sizeof(u32);
- *
- *	// Protect the non nmi buffer
- *	// This also protects the rcu read side
- *	local_irq_save(irq_flags);
- *	__cpu = smp_processor_id();
- *
- *	if (in_nmi())
- *		trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
- *	else
- *		trace_buf = rcu_dereference_sched(perf_trace_buf);
- *
- *	if (!trace_buf)
- *		goto end;
- *
- *	trace_buf = per_cpu_ptr(trace_buf, __cpu);
- *
- * 	// Avoid recursion from perf that could mess up the buffer
- * 	if (trace_buf->recursion++)
- *		goto end_recursion;
- *
- * 	raw_data = trace_buf->buf;
- *
- *	// Make recursion update visible before entering perf_tp_event
- *	// so that we protect from perf recursions.
- *
- *	barrier();
- *
- *	//zero dead bytes from alignment to avoid stack leak to userspace:
- *	*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
- *	entry = (struct ftrace_raw_<call> *)raw_data;
- *	ent = &entry->ent;
- *	tracing_generic_entry_update(ent, irq_flags, pc);
- *	ent->type = event_call->id;
- *
- *	<tstruct> <- do some jobs with dynamic arrays
+ * Stage 8 of the trace events.
  *
- *	<assign>  <- affect our values
- *
- *	perf_tp_event(event_call->id, __addr, __count, entry,
- *		     __entry_size);  <- submit them to perf counter
- *
- * }
+ * Register/unregister probes at module load/unload.
  */
 
-#ifdef CONFIG_PERF_EVENTS
-
-#undef __entry
-#define __entry entry
+#include "lttng-events-reset.h"	/* Reset all macros within TRACE_EVENT */
 
-#undef __get_dynamic_array
-#define __get_dynamic_array(field)	\
-		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
+#define TP_ID1(_token, _system)	_token##_system
+#define TP_ID(_token, _system)	TP_ID1(_token, _system)
+#define module_init_eval1(_token, _system)	module_init(_token##_system)
+#define module_init_eval(_token, _system)	module_init_eval1(_token, _system)
+#define module_exit_eval1(_token, _system)	module_exit(_token##_system)
+#define module_exit_eval(_token, _system)	module_exit_eval1(_token, _system)
 
-#undef __get_str
-#define __get_str(field) (char *)__get_dynamic_array(field)
+static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
+{
+	int ret;
+	int i;
 
-#undef __perf_addr
-#define __perf_addr(a) __addr = (a)
+	wrapper_vmalloc_sync_all();
+	ret = TP_ID(__lttng_types_init__, TRACE_SYSTEM)();
+	if (ret)
+		return ret;
+	for (i = 0; i < ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)); i++) {
+		const struct lttng_event_desc *event_desc;
+
+		event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i];
+		ret = ltt_probe_register(event_desc->name,
+					 event_desc->probe_callback);
+		if (ret)
+			goto error;
+	}
+	return 0;
 
-#undef __perf_count
-#define __perf_count(c) __count = (c)
+error:
+	for (i--; i >= 0; i--) {
+		const struct lttng_event_desc *event_desc;
 
-#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
-static notrace void							\
-perf_trace_##call(void *__data, proto)					\
-{									\
-	struct ftrace_event_call *event_call = __data;			\
-	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
-	struct ftrace_raw_##call *entry;				\
-	struct pt_regs __regs;						\
-	u64 __addr = 0, __count = 1;					\
-	struct hlist_head *head;					\
-	int __entry_size;						\
-	int __data_size;						\
-	int rctx;							\
-									\
-	perf_fetch_caller_regs(&__regs);				\
-									\
-	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
-	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
-			     sizeof(u64));				\
-	__entry_size -= sizeof(u32);					\
-									\
-	if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,		\
-		      "profile buffer not large enough"))		\
-		return;							\
-									\
-	entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(	\
-		__entry_size, event_call->event.type, &__regs, &rctx);	\
-	if (!entry)							\
-		return;							\
-									\
-	tstruct								\
-									\
-	{ assign; }							\
-									\
-	head = this_cpu_ptr(event_call->perf_events);			\
-	perf_trace_buf_submit(entry, __entry_size, rctx, __addr,	\
-		__count, &__regs, head);				\
+		event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i];
+		ltt_probe_unregister(event_desc->name);
+	}
+	return ret;
 }
 
-/*
- * This part is compiled out, it is only here as a build time check
- * to make sure that if the tracepoint handling changes, the
- * perf probe will fail to compile unless it too is updated.
- */
-#undef DEFINE_EVENT
-#define DEFINE_EVENT(template, call, proto, args)			\
-static inline void perf_test_probe_##call(void)				\
-{									\
-	check_trace_callback_type_##call(perf_trace_##template);	\
-}
+module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
 
+static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
+{
+	int i;
 
-#undef DEFINE_EVENT_PRINT
-#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
-	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+	for (i = 0; i < ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)); i++) {
+		const struct lttng_event_desc *event_desc;
 
-#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
-#endif /* CONFIG_PERF_EVENTS */
+		event_desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[i];
+		ltt_probe_unregister(event_desc->name);
+	}
+	TP_ID(__lttng_types_exit__, TRACE_SYSTEM)();
+}
+
+module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
 
-#undef _TRACE_PROFILE_INIT
-#endif //0
+#undef module_init_eval
+#undef module_exit_eval
+#undef TP_ID1
+#undef TP_ID