*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Ported to userspace by Pierre-Marc Fournier.
*/
-#define _LGPL_SOURCE
#include <urcu-bp.h>
-#include <ust/immediate.h>
-#include <ust/core.h>
+#include <urcu/list.h>
-struct module;
-struct tracepoint;
-
-struct probe {
+struct tracepoint_probe {
void *func;
void *data;
};
struct tracepoint {
const char *name; /* Tracepoint name */
- DEFINE_IMV(char, state); /* State. */
- struct probe *probes;
-} __attribute__((aligned(32))); /*
- * Aligned on 32 bytes because it is
- * globally visible and gcc happily
- * align these on the structure size.
- * Keep in sync with vmlinux.lds.h.
- */
-
-#define PARAMS(args...) args
+ char state; /* State. */
+ struct tracepoint_probe *probes;
+};
-#define TP_PROTO(args...) args
-#define TP_ARGS(args...) args
+/*
+ * Tracepoints should be added to the instrumented code using the
+ * "tracepoint()" macro.
+ */
+#define tracepoint(name, args...) __trace_##name(args)
-#define CONFIG_TRACEPOINTS
-#ifdef CONFIG_TRACEPOINTS
+/*
+ * Library should be made known to libust by declaring TRACEPOINT_LIB in
+ * the source file. (Usually at the end of the file, in the outermost
+ * scope).
+ */
+#define TRACEPOINT_LIB \
+ extern struct tracepoint * const __start___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
+ extern struct tracepoint * const __stop___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
+ static struct tracepoint * __tracepoint_ptr_dummy \
+ __attribute__((used, section("__tracepoints_ptrs"))); \
+ static void __attribute__((constructor)) __tracepoints__init(void) \
+ { \
+ tracepoint_register_lib(__start___tracepoints_ptrs, \
+ __stop___tracepoints_ptrs - \
+ __start___tracepoints_ptrs); \
+ } \
+ \
+ static void __attribute__((destructor)) __tracepoints__destroy(void) \
+ { \
+ tracepoint_unregister_lib(__start___tracepoints_ptrs); \
+ }
/*
* it_func[0] is never NULL because there is at least one element in the array
*/
#define __DO_TRACE(tp, proto, args) \
do { \
- struct probe *it_probe_ptr; \
- void *it_func; \
- void *__data; \
+ struct tracepoint_probe *__tp_it_probe_ptr; \
+ void *__tp_it_func; \
+ void *__tp_cb_data; \
\
rcu_read_lock(); \
- it_probe_ptr = rcu_dereference((tp)->probes); \
- if (it_probe_ptr) { \
+ __tp_it_probe_ptr = rcu_dereference((tp)->probes); \
+ if (__tp_it_probe_ptr) { \
do { \
- it_func = (it_probe_ptr)->func; \
- __data = (it_probe_ptr)->data; \
- ((void(*)(proto))(it_func))(args); \
- } while ((++it_probe_ptr)->func); \
+ __tp_it_func = __tp_it_probe_ptr->func; \
+ __tp_cb_data = __tp_it_probe_ptr->data; \
+ ((void(*)(proto))__tp_it_func)(args); \
+ } while ((++__tp_it_probe_ptr)->func); \
} \
rcu_read_unlock(); \
} while (0)
-#define __CHECK_TRACE(name, generic, proto, args) \
+#define TP_PARAMS(args...) args
+#define TP_PROTO(args...) args
+#define TP_ARGS(args...) args
+
+#define __CHECK_TRACE(name, proto, args) \
do { \
- if (!generic) { \
- if (unlikely(imv_read(__tracepoint_##name.state))) \
- __DO_TRACE(&__tracepoint_##name, \
- TP_PROTO(proto), TP_ARGS(args)); \
- } else { \
- if (unlikely(_imv_read(__tracepoint_##name.state))) \
- __DO_TRACE(&__tracepoint_##name, \
- TP_PROTO(proto), TP_ARGS(args)); \
- } \
+ if (unlikely(__tracepoint_##name.state)) \
+ __DO_TRACE(&__tracepoint_##name, \
+ TP_PROTO(proto), TP_ARGS(args)); \
} while (0)
/*
* Make sure the alignment of the structure in the __tracepoints section will
* not add unwanted padding between the beginning of the section and the
* structure. Force alignment to the same alignment as the section start.
- *
- * The "generic" argument, passed to the declared __trace_##name inline
- * function controls which tracepoint enabling mechanism must be used.
- * If generic is true, a variable read is used.
- * If generic is false, immediate values are used.
*/
-#define __DECLARE_TRACE(name, proto, args, data_proto, data_args) \
+#define __DECLARE_TRACEPOINT(name, proto, args, data_proto, data_args) \
extern struct tracepoint __tracepoint_##name; \
- static inline void trace_##name(proto) \
- { \
- __CHECK_TRACE(name, 0, TP_PROTO(data_proto), \
- TP_ARGS(data_args)); \
- } \
- static inline void _trace_##name(proto) \
+ static inline void __trace_##name(proto) \
{ \
- __CHECK_TRACE(name, 1, TP_PROTO(data_proto), \
+ __CHECK_TRACE(name, TP_PROTO(data_proto), \
TP_ARGS(data_args)); \
} \
static inline int \
- register_trace_##name(void (*probe)(data_proto), void *data) \
+ __register_trace_##name(void (*probe)(data_proto), void *data) \
{ \
- return tracepoint_probe_register(#name, (void *)probe, \
+ return __tracepoint_probe_register(#name, (void *)probe,\
data); \
\
} \
static inline int \
- unregister_trace_##name(void (*probe)(data_proto), void *data) \
+ __unregister_trace_##name(void (*probe)(data_proto), void *data)\
{ \
- return tracepoint_probe_unregister(#name, (void *)probe, \
+ return __tracepoint_probe_unregister(#name, (void *)probe, \
data); \
}
-#define DEFINE_TRACE_FN(name, reg, unreg) \
+/*
+ * The need for the _DECLARE_TRACEPOINT_NOARGS() is to handle the prototype
+ * (void). "void" is a special value in a function prototype and can
+ * not be combined with other arguments. Since the DECLARE_TRACEPOINT()
+ * macro adds a data element at the beginning of the prototype,
+ * we need a way to differentiate "(void *data, proto)" from
+ * "(void *data, void)". The second prototype is invalid.
+ *
+ * DECLARE_TRACEPOINT_NOARGS() passes "void" as the tracepoint prototype
+ * and "void *__tp_cb_data" as the callback prototype.
+ *
+ * DECLARE_TRACEPOINT() passes "proto" as the tracepoint protoype and
+ * "void *__tp_cb_data, proto" as the callback prototype.
+ */
+#define _DECLARE_TRACEPOINT_NOARGS(name) \
+ __DECLARE_TRACEPOINT(name, void, , void *__tp_cb_data, __tp_cb_data)
+
+#define _DECLARE_TRACEPOINT(name, proto, args) \
+ __DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args), \
+ TP_PARAMS(void *__tp_cb_data, proto), \
+ TP_PARAMS(__tp_cb_data, args))
+
+/*
+ * __tracepoints_ptrs section is not const (read-only) to let the linker update
+ * the pointer, allowing PIC code.
+ */
+#define _DEFINE_TRACEPOINT(name) \
static const char __tpstrtab_##name[] \
__attribute__((section("__tracepoints_strings"))) = #name; \
struct tracepoint __tracepoint_##name \
- __attribute__((section("__tracepoints"), aligned(32))) = \
- { __tpstrtab_##name, 0, NULL }
-
-#define DEFINE_TRACE(name) \
- DEFINE_TRACE_FN(name, NULL, NULL);
-
-extern void tracepoint_update_probe_range(struct tracepoint *begin,
- struct tracepoint *end);
-
-#else /* !CONFIG_TRACEPOINTS */
-#define __DECLARE_TRACE(name, proto, args) \
- static inline void trace_##name(proto) \
- { } \
- static inline void _trace_##name(proto) \
- { } \
- static inline int register_trace_##name(void (*probe)(proto)) \
- { \
- return -ENOSYS; \
- } \
- static inline int unregister_trace_##name(void (*probe)(proto)) \
- { \
- return -ENOSYS; \
- }
+ __attribute__((section("__tracepoints"))) = \
+ { __tpstrtab_##name, 0, NULL }; \
+ static struct tracepoint * __tracepoint_ptr_##name \
+ __attribute__((used, section("__tracepoints_ptrs"))) = \
+ &__tracepoint_##name;
-#define DEFINE_TRACE(name)
-#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
-#define EXPORT_TRACEPOINT_SYMBOL(name)
-static inline void tracepoint_update_probe_range(struct tracepoint *begin,
- struct tracepoint *end)
-{ }
-#endif /* CONFIG_TRACEPOINTS */
-
-#define DECLARE_TRACE(name, proto, args) \
- __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
- PARAMS(void *__data, proto), \
- PARAMS(__data, args))
+#define __register_tracepoint(name, probe, data) \
+ __register_trace_##name(probe, data)
+#define __unregister_tracepoint(name, probe, data) \
+ __unregister_trace_##name(probe, data)
/*
* Connect a probe to a tracepoint.
- * Internal API, should not be used directly.
+ * Internal API.
*/
-extern int tracepoint_probe_register(const char *name, void *probe, void *data);
+extern
+int __tracepoint_probe_register(const char *name, void *probe, void *data);
/*
* Disconnect a probe from a tracepoint.
- * Internal API, should not be used directly.
+ * Internal API.
*/
-extern int tracepoint_probe_unregister(const char *name, void *probe, void *data);
-
-extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
- void *data);
-extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
- void *data);
-extern void tracepoint_probe_update_all(void);
-
-struct tracepoint_iter {
-//ust// struct module *module;
- struct tracepoint_lib *lib;
- struct tracepoint *tracepoint;
-};
-
-extern void tracepoint_iter_start(struct tracepoint_iter *iter);
-extern void tracepoint_iter_next(struct tracepoint_iter *iter);
-extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
-extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
-extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
- struct tracepoint *begin, struct tracepoint *end);
-
-/*
- * tracepoint_synchronize_unregister must be called between the last tracepoint
- * probe unregistration and the end of module exit to make sure there is no
- * caller executing a probe when it is freed.
- */
-static inline void tracepoint_synchronize_unregister(void)
-{
-//ust// synchronize_sched();
-}
+extern
+int __tracepoint_probe_unregister(const char *name, void *probe, void *data);
struct tracepoint_lib {
- struct tracepoint *tracepoints_start;
+ struct tracepoint * const *tracepoints_start;
int tracepoints_count;
- struct list_head list;
+ struct cds_list_head list;
};
-extern int tracepoint_register_lib(struct tracepoint *tracepoints_start,
- int tracepoints_count);
-extern int tracepoint_unregister_lib(struct tracepoint *tracepoints_start);
+extern
+int tracepoint_register_lib(struct tracepoint * const *tracepoints_start,
+ int tracepoints_count);
+extern
+int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start);
-#define TRACEPOINT_LIB \
- extern struct tracepoint __start___tracepoints[] __attribute__((weak, visibility("hidden"))); \
- extern struct tracepoint __stop___tracepoints[] __attribute__((weak, visibility("hidden"))); \
- static void __attribute__((constructor)) __tracepoints__init(void) \
- { \
- tracepoint_register_lib(__start___tracepoints, \
- (((long)__stop___tracepoints)-((long)__start___tracepoints))/sizeof(struct tracepoint)); \
- } \
- \
- static void __attribute__((destructor)) __tracepoints__destroy(void) \
- { \
- tracepoint_unregister_lib(__start___tracepoints); \
- }
-
-#ifndef TRACE_EVENT
+#ifndef TRACEPOINT_EVENT
/*
- * For use with the TRACE_EVENT macro:
+ * For use with the TRACEPOINT_EVENT macro:
*
* We define a tracepoint, its arguments, its printf format
* and its 'fast binary record' layout.
*
- * Firstly, name your tracepoint via TRACE_EVENT(name : the
+ * Firstly, name your tracepoint via TRACEPOINT_EVENT(name : the
* 'subsystem_event' notation is fine.
*
* Think about this whole construct as the
* 'trace_sched_switch() function' from now on.
*
*
- * TRACE_EVENT(sched_switch,
+ * TRACEPOINT_EVENT(sched_switch,
*
* *
* * A function has a regular function arguments
*
* *
* * Fast binary tracing: define the trace record via
- * * TP_STRUCT__entry(). You can think about it like a
+ * * TP_FIELDS(). You can think about it like a
* * regular C structure local variable definition.
* *
* * This is how the trace record is structured and will
* * be saved into the ring buffer. These are the fields
* * that will be exposed to readers.
* *
- * * The declared 'local variable' is called '__entry'
+ * * tp_field(pid_t, prev_pid, prev->pid) is equivalent
+ * * to a standard declaraton:
* *
- * * __field(pid_t, prev_prid) is equivalent to a standard declariton:
+ * * pid_t prev_pid;
* *
- * * pid_t prev_pid;
+ * * followed by an assignment:
* *
- * * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
+ * * prev_pid = prev->pid;
* *
- * * char prev_comm[TASK_COMM_LEN];
+ * * tp_array(char, prev_comm, TASK_COMM_LEN, prev->comm) is
+ * * equivalent to:
* *
- *
- * TP_STRUCT__entry(
- * __array( char, prev_comm, TASK_COMM_LEN )
- * __field( pid_t, prev_pid )
- * __field( int, prev_prio )
- * __array( char, next_comm, TASK_COMM_LEN )
- * __field( pid_t, next_pid )
- * __field( int, next_prio )
- * ),
- *
+ * * char prev_comm[TASK_COMM_LEN];
* *
- * * Assign the entry into the trace record, by embedding
- * * a full C statement block into TP_fast_assign(). You
- * * can refer to the trace record as '__entry' -
- * * otherwise you can put arbitrary C code in here.
+ * * followed by an assignment:
* *
- * * Note: this C code will execute every time a trace event
- * * happens, on an active tracepoint.
+ * * memcpy(prev_comm, prev->comm, TASK_COMM_LEN);
* *
*
- * TP_fast_assign(
- * memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
- * __entry->prev_pid = prev->pid;
- * __entry->prev_prio = prev->prio;
- * memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
- * __entry->next_pid = next->pid;
- * __entry->next_prio = next->prio;
+ * TP_FIELDS(
+ * tp_array(char, prev_comm, TASK_COMM_LEN, prev->comm)
+ * tp_field(pid_t, prev_pid, prev->pid)
+ * tp_field(int, prev_prio, prev->prio)
+ * tp_array(char, next_comm, TASK_COMM_LEN, next->comm)
+ * tp_field(pid_t, next_pid, next->pid)
+ * tp_field(int, next_prio, next->prio)
* )
- *
- * *
- * * Formatted output of a trace record via TP_printf().
- * * This is how the tracepoint will appear under debugging
- * * of tracepoints.
- * *
- * * (raw-binary tracing wont actually perform this step.)
- * *
- *
- * TP_printf("task %s:%d [%d] ==> %s:%d [%d]",
- * __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
- * __entry->next_comm, __entry->next_pid, __entry->next_prio),
- *
* );
- *
- * This macro construct is thus used for the regular printf format
- * tracing setup.
- *
- * A set of (un)registration functions can be passed to the variant
- * TRACE_EVENT_FN to perform any (un)registration work.
*/
-struct trace_event {
- const char *name;
- int (*regfunc)(void *data);
- int (*unregfunc)(void *data);
-} __attribute__((aligned(32)));
-
-struct trace_event_lib {
- struct trace_event *trace_events_start;
- int trace_events_count;
- struct list_head list;
-};
-
-struct trace_event_iter {
- struct trace_event_lib *lib;
- struct trace_event *trace_event;
-};
+#define TRACEPOINT_EVENT(name, proto, args, fields) \
+ _DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args))
-extern void lock_trace_events(void);
-extern void unlock_trace_events(void);
+#define TRACEPOINT_EVENT_CLASS(name, proto, args, fields)
+#define TRACEPOINT_EVENT_INSTANCE(template, name, proto, args) \
+ _DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args))
-extern void trace_event_iter_start(struct trace_event_iter *iter);
-extern void trace_event_iter_next(struct trace_event_iter *iter);
-extern void trace_event_iter_reset(struct trace_event_iter *iter);
-
-extern int trace_event_get_iter_range(struct trace_event **trace_event,
- struct trace_event *begin,
- struct trace_event *end);
+/*
+ * Declaration of tracepoints that take 0 argument.
+ */
+#define TRACEPOINT_EVENT_NOARGS(name, fields) \
+ _DECLARE_TRACEPOINT_NOARGS(name)
-extern void trace_event_update_process(void);
-extern int is_trace_event_enabled(const char *channel, const char *name);
+#define TRACEPOINT_EVENT_CLASS_NOARGS(name, fields)
+#define TRACEPOINT_EVENT_INSTANCE_NOARGS(template, name) \
+ _DECLARE_TRACEPOINT_NOARGS(name)
-extern int trace_event_register_lib(struct trace_event *start_trace_events,
- int trace_event_count);
-extern int trace_event_unregister_lib(struct trace_event *start_trace_events);
-#define TRACE_EVENT_LIB \
- extern struct trace_event __start___trace_events[] \
+#define TRACEPOINT_EVENT_LIB \
+ extern struct trace_event * const __start___trace_events_ptrs[] \
__attribute__((weak, visibility("hidden"))); \
- extern struct trace_event __stop___trace_events[] \
+ extern struct trace_event * const __stop___trace_events_ptrs[] \
__attribute__((weak, visibility("hidden"))); \
+ static struct trace_event * __event_ptrs_dummy \
+ __attribute__((used, section("__trace_events_ptrs"))); \
static void __attribute__((constructor)) \
__trace_events__init(void) \
{ \
- long trace_event_count =((long)__stop___trace_events- \
- (long)__start___trace_events) \
- /sizeof(struct trace_event); \
- trace_event_register_lib(__start___trace_events, \
- trace_event_count); \
+ trace_event_register_lib(__start___trace_events_ptrs, \
+ __stop___trace_events_ptrs - \
+ __start___trace_events_ptrs); \
} \
\
static void __attribute__((destructor)) \
__trace_event__destroy(void) \
{ \
- trace_event_unregister_lib(__start___trace_events); \
+ trace_event_unregister_lib(__start___trace_events_ptrs);\
}
-#define DECLARE_TRACE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
-#define DEFINE_TRACE_EVENT(template, name, proto, args) \
- DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
-#define DEFINE_TRACE_EVENT_PRINT(template, name, proto, args, print) \
- DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+struct trace_event {
+ const char *name;
+};
-#define TRACE_EVENT(name, proto, args, struct, assign, print) \
- DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
-#define TRACE_EVENT_FN(name, proto, args, struct, \
- assign, print, reg, unreg) \
- DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+struct trace_event_lib {
+ struct trace_event * const *trace_events_start;
+ int trace_events_count;
+ struct cds_list_head list;
+};
-#endif /* ifdef TRACE_EVENT (see note above) */
+extern
+int trace_event_register_lib(struct trace_event * const *start_trace_events,
+ int trace_event_count);
+extern
+int trace_event_unregister_lib(struct trace_event * const *start_trace_events);
+#endif /* #ifndef TRACEPOINT_EVENT */
#endif /* _UST_TRACEPOINT_H */
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