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TOMOYO Linux Cross Reference
Linux/include/linux/tracepoint.h

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  1 #ifndef _LINUX_TRACEPOINT_H
  2 #define _LINUX_TRACEPOINT_H
  3 
  4 /*
  5  * Kernel Tracepoint API.
  6  *
  7  * See Documentation/trace/tracepoints.rst.
  8  *
  9  * Copyright (C) 2008-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 10  *
 11  * Heavily inspired from the Linux Kernel Markers.
 12  *
 13  * This file is released under the GPLv2.
 14  * See the file COPYING for more details.
 15  */
 16 
 17 #include <linux/smp.h>
 18 #include <linux/srcu.h>
 19 #include <linux/errno.h>
 20 #include <linux/types.h>
 21 #include <linux/cpumask.h>
 22 #include <linux/rcupdate.h>
 23 #include <linux/tracepoint-defs.h>
 24 
 25 struct module;
 26 struct tracepoint;
 27 struct notifier_block;
 28 
 29 struct trace_eval_map {
 30         const char              *system;
 31         const char              *eval_string;
 32         unsigned long           eval_value;
 33 };
 34 
 35 #define TRACEPOINT_DEFAULT_PRIO 10
 36 
 37 extern struct srcu_struct tracepoint_srcu;
 38 
 39 extern int
 40 tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
 41 extern int
 42 tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
 43                                int prio);
 44 extern int
 45 tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
 46 extern void
 47 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
 48                 void *priv);
 49 
 50 #ifdef CONFIG_MODULES
 51 struct tp_module {
 52         struct list_head list;
 53         struct module *mod;
 54 };
 55 
 56 bool trace_module_has_bad_taint(struct module *mod);
 57 extern int register_tracepoint_module_notifier(struct notifier_block *nb);
 58 extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
 59 #else
 60 static inline bool trace_module_has_bad_taint(struct module *mod)
 61 {
 62         return false;
 63 }
 64 static inline
 65 int register_tracepoint_module_notifier(struct notifier_block *nb)
 66 {
 67         return 0;
 68 }
 69 static inline
 70 int unregister_tracepoint_module_notifier(struct notifier_block *nb)
 71 {
 72         return 0;
 73 }
 74 #endif /* CONFIG_MODULES */
 75 
 76 /*
 77  * tracepoint_synchronize_unregister must be called between the last tracepoint
 78  * probe unregistration and the end of module exit to make sure there is no
 79  * caller executing a probe when it is freed.
 80  */
 81 #ifdef CONFIG_TRACEPOINTS
 82 static inline void tracepoint_synchronize_unregister(void)
 83 {
 84         synchronize_srcu(&tracepoint_srcu);
 85         synchronize_sched();
 86 }
 87 #else
 88 static inline void tracepoint_synchronize_unregister(void)
 89 { }
 90 #endif
 91 
 92 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
 93 extern int syscall_regfunc(void);
 94 extern void syscall_unregfunc(void);
 95 #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
 96 
 97 #define PARAMS(args...) args
 98 
 99 #define TRACE_DEFINE_ENUM(x)
100 #define TRACE_DEFINE_SIZEOF(x)
101 
102 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
103 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
104 {
105         return offset_to_ptr(p);
106 }
107 
108 #define __TRACEPOINT_ENTRY(name)                                        \
109         asm("   .section \"__tracepoints_ptrs\", \"a\"          \n"     \
110             "   .balign 4                                       \n"     \
111             "   .long   __tracepoint_" #name " - .              \n"     \
112             "   .previous                                       \n")
113 #else
114 static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
115 {
116         return *p;
117 }
118 
119 #define __TRACEPOINT_ENTRY(name)                                         \
120         static tracepoint_ptr_t __tracepoint_ptr_##name __used           \
121         __attribute__((section("__tracepoints_ptrs"))) =                 \
122                 &__tracepoint_##name
123 #endif
124 
125 #endif /* _LINUX_TRACEPOINT_H */
126 
127 /*
128  * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
129  *  file ifdef protection.
130  *  This is due to the way trace events work. If a file includes two
131  *  trace event headers under one "CREATE_TRACE_POINTS" the first include
132  *  will override the TRACE_EVENT and break the second include.
133  */
134 
135 #ifndef DECLARE_TRACE
136 
137 #define TP_PROTO(args...)       args
138 #define TP_ARGS(args...)        args
139 #define TP_CONDITION(args...)   args
140 
141 /*
142  * Individual subsystem my have a separate configuration to
143  * enable their tracepoints. By default, this file will create
144  * the tracepoints if CONFIG_TRACEPOINT is defined. If a subsystem
145  * wants to be able to disable its tracepoints from being created
146  * it can define NOTRACE before including the tracepoint headers.
147  */
148 #if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
149 #define TRACEPOINTS_ENABLED
150 #endif
151 
152 #ifdef TRACEPOINTS_ENABLED
153 
154 /*
155  * it_func[0] is never NULL because there is at least one element in the array
156  * when the array itself is non NULL.
157  *
158  * Note, the proto and args passed in includes "__data" as the first parameter.
159  * The reason for this is to handle the "void" prototype. If a tracepoint
160  * has a "void" prototype, then it is invalid to declare a function
161  * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
162  * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
163  */
164 #define __DO_TRACE(tp, proto, args, cond, rcuidle)                      \
165         do {                                                            \
166                 struct tracepoint_func *it_func_ptr;                    \
167                 void *it_func;                                          \
168                 void *__data;                                           \
169                 int __maybe_unused idx = 0;                             \
170                                                                         \
171                 if (!(cond))                                            \
172                         return;                                         \
173                                                                         \
174                 /* srcu can't be used from NMI */                       \
175                 WARN_ON_ONCE(rcuidle && in_nmi());                      \
176                                                                         \
177                 /* keep srcu and sched-rcu usage consistent */          \
178                 preempt_disable_notrace();                              \
179                                                                         \
180                 /*                                                      \
181                  * For rcuidle callers, use srcu since sched-rcu        \
182                  * doesn't work from the idle path.                     \
183                  */                                                     \
184                 if (rcuidle) {                                          \
185                         idx = srcu_read_lock_notrace(&tracepoint_srcu); \
186                         rcu_irq_enter_irqson();                         \
187                 }                                                       \
188                                                                         \
189                 it_func_ptr = rcu_dereference_raw((tp)->funcs);         \
190                                                                         \
191                 if (it_func_ptr) {                                      \
192                         do {                                            \
193                                 it_func = (it_func_ptr)->func;          \
194                                 __data = (it_func_ptr)->data;           \
195                                 ((void(*)(proto))(it_func))(args);      \
196                         } while ((++it_func_ptr)->func);                \
197                 }                                                       \
198                                                                         \
199                 if (rcuidle) {                                          \
200                         rcu_irq_exit_irqson();                          \
201                         srcu_read_unlock_notrace(&tracepoint_srcu, idx);\
202                 }                                                       \
203                                                                         \
204                 preempt_enable_notrace();                               \
205         } while (0)
206 
207 #ifndef MODULE
208 #define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) \
209         static inline void trace_##name##_rcuidle(proto)                \
210         {                                                               \
211                 if (static_key_false(&__tracepoint_##name.key))         \
212                         __DO_TRACE(&__tracepoint_##name,                \
213                                 TP_PROTO(data_proto),                   \
214                                 TP_ARGS(data_args),                     \
215                                 TP_CONDITION(cond), 1);                 \
216         }
217 #else
218 #define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)
219 #endif
220 
221 /*
222  * Make sure the alignment of the structure in the __tracepoints section will
223  * not add unwanted padding between the beginning of the section and the
224  * structure. Force alignment to the same alignment as the section start.
225  *
226  * When lockdep is enabled, we make sure to always do the RCU portions of
227  * the tracepoint code, regardless of whether tracing is on. However,
228  * don't check if the condition is false, due to interaction with idle
229  * instrumentation. This lets us find RCU issues triggered with tracepoints
230  * even when this tracepoint is off. This code has no purpose other than
231  * poking RCU a bit.
232  */
233 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
234         extern struct tracepoint __tracepoint_##name;                   \
235         static inline void trace_##name(proto)                          \
236         {                                                               \
237                 if (static_key_false(&__tracepoint_##name.key))         \
238                         __DO_TRACE(&__tracepoint_##name,                \
239                                 TP_PROTO(data_proto),                   \
240                                 TP_ARGS(data_args),                     \
241                                 TP_CONDITION(cond), 0);                 \
242                 if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {             \
243                         rcu_read_lock_sched_notrace();                  \
244                         rcu_dereference_sched(__tracepoint_##name.funcs);\
245                         rcu_read_unlock_sched_notrace();                \
246                 }                                                       \
247         }                                                               \
248         __DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),          \
249                 PARAMS(cond), PARAMS(data_proto), PARAMS(data_args))    \
250         static inline int                                               \
251         register_trace_##name(void (*probe)(data_proto), void *data)    \
252         {                                                               \
253                 return tracepoint_probe_register(&__tracepoint_##name,  \
254                                                 (void *)probe, data);   \
255         }                                                               \
256         static inline int                                               \
257         register_trace_prio_##name(void (*probe)(data_proto), void *data,\
258                                    int prio)                            \
259         {                                                               \
260                 return tracepoint_probe_register_prio(&__tracepoint_##name, \
261                                               (void *)probe, data, prio); \
262         }                                                               \
263         static inline int                                               \
264         unregister_trace_##name(void (*probe)(data_proto), void *data)  \
265         {                                                               \
266                 return tracepoint_probe_unregister(&__tracepoint_##name,\
267                                                 (void *)probe, data);   \
268         }                                                               \
269         static inline void                                              \
270         check_trace_callback_type_##name(void (*cb)(data_proto))        \
271         {                                                               \
272         }                                                               \
273         static inline bool                                              \
274         trace_##name##_enabled(void)                                    \
275         {                                                               \
276                 return static_key_false(&__tracepoint_##name.key);      \
277         }
278 
279 /*
280  * We have no guarantee that gcc and the linker won't up-align the tracepoint
281  * structures, so we create an array of pointers that will be used for iteration
282  * on the tracepoints.
283  */
284 #define DEFINE_TRACE_FN(name, reg, unreg)                                \
285         static const char __tpstrtab_##name[]                            \
286         __attribute__((section("__tracepoints_strings"))) = #name;       \
287         struct tracepoint __tracepoint_##name                            \
288         __attribute__((section("__tracepoints"), used)) =                \
289                 { __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
290         __TRACEPOINT_ENTRY(name);
291 
292 #define DEFINE_TRACE(name)                                              \
293         DEFINE_TRACE_FN(name, NULL, NULL);
294 
295 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)                              \
296         EXPORT_SYMBOL_GPL(__tracepoint_##name)
297 #define EXPORT_TRACEPOINT_SYMBOL(name)                                  \
298         EXPORT_SYMBOL(__tracepoint_##name)
299 
300 #else /* !TRACEPOINTS_ENABLED */
301 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
302         static inline void trace_##name(proto)                          \
303         { }                                                             \
304         static inline void trace_##name##_rcuidle(proto)                \
305         { }                                                             \
306         static inline int                                               \
307         register_trace_##name(void (*probe)(data_proto),                \
308                               void *data)                               \
309         {                                                               \
310                 return -ENOSYS;                                         \
311         }                                                               \
312         static inline int                                               \
313         unregister_trace_##name(void (*probe)(data_proto),              \
314                                 void *data)                             \
315         {                                                               \
316                 return -ENOSYS;                                         \
317         }                                                               \
318         static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
319         {                                                               \
320         }                                                               \
321         static inline bool                                              \
322         trace_##name##_enabled(void)                                    \
323         {                                                               \
324                 return false;                                           \
325         }
326 
327 #define DEFINE_TRACE_FN(name, reg, unreg)
328 #define DEFINE_TRACE(name)
329 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
330 #define EXPORT_TRACEPOINT_SYMBOL(name)
331 
332 #endif /* TRACEPOINTS_ENABLED */
333 
334 #ifdef CONFIG_TRACING
335 /**
336  * tracepoint_string - register constant persistent string to trace system
337  * @str - a constant persistent string that will be referenced in tracepoints
338  *
339  * If constant strings are being used in tracepoints, it is faster and
340  * more efficient to just save the pointer to the string and reference
341  * that with a printf "%s" instead of saving the string in the ring buffer
342  * and wasting space and time.
343  *
344  * The problem with the above approach is that userspace tools that read
345  * the binary output of the trace buffers do not have access to the string.
346  * Instead they just show the address of the string which is not very
347  * useful to users.
348  *
349  * With tracepoint_string(), the string will be registered to the tracing
350  * system and exported to userspace via the debugfs/tracing/printk_formats
351  * file that maps the string address to the string text. This way userspace
352  * tools that read the binary buffers have a way to map the pointers to
353  * the ASCII strings they represent.
354  *
355  * The @str used must be a constant string and persistent as it would not
356  * make sense to show a string that no longer exists. But it is still fine
357  * to be used with modules, because when modules are unloaded, if they
358  * had tracepoints, the ring buffers are cleared too. As long as the string
359  * does not change during the life of the module, it is fine to use
360  * tracepoint_string() within a module.
361  */
362 #define tracepoint_string(str)                                          \
363         ({                                                              \
364                 static const char *___tp_str __tracepoint_string = str; \
365                 ___tp_str;                                              \
366         })
367 #define __tracepoint_string     __attribute__((section("__tracepoint_str")))
368 #else
369 /*
370  * tracepoint_string() is used to save the string address for userspace
371  * tracing tools. When tracing isn't configured, there's no need to save
372  * anything.
373  */
374 # define tracepoint_string(str) str
375 # define __tracepoint_string
376 #endif
377 
378 /*
379  * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
380  * (void). "void" is a special value in a function prototype and can
381  * not be combined with other arguments. Since the DECLARE_TRACE()
382  * macro adds a data element at the beginning of the prototype,
383  * we need a way to differentiate "(void *data, proto)" from
384  * "(void *data, void)". The second prototype is invalid.
385  *
386  * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
387  * and "void *__data" as the callback prototype.
388  *
389  * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
390  * "void *__data, proto" as the callback prototype.
391  */
392 #define DECLARE_TRACE_NOARGS(name)                                      \
393         __DECLARE_TRACE(name, void, ,                                   \
394                         cpu_online(raw_smp_processor_id()),             \
395                         void *__data, __data)
396 
397 #define DECLARE_TRACE(name, proto, args)                                \
398         __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),              \
399                         cpu_online(raw_smp_processor_id()),             \
400                         PARAMS(void *__data, proto),                    \
401                         PARAMS(__data, args))
402 
403 #define DECLARE_TRACE_CONDITION(name, proto, args, cond)                \
404         __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),              \
405                         cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \
406                         PARAMS(void *__data, proto),                    \
407                         PARAMS(__data, args))
408 
409 #define TRACE_EVENT_FLAGS(event, flag)
410 
411 #define TRACE_EVENT_PERF_PERM(event, expr...)
412 
413 #endif /* DECLARE_TRACE */
414 
415 #ifndef TRACE_EVENT
416 /*
417  * For use with the TRACE_EVENT macro:
418  *
419  * We define a tracepoint, its arguments, its printk format
420  * and its 'fast binary record' layout.
421  *
422  * Firstly, name your tracepoint via TRACE_EVENT(name : the
423  * 'subsystem_event' notation is fine.
424  *
425  * Think about this whole construct as the
426  * 'trace_sched_switch() function' from now on.
427  *
428  *
429  *  TRACE_EVENT(sched_switch,
430  *
431  *      *
432  *      * A function has a regular function arguments
433  *      * prototype, declare it via TP_PROTO():
434  *      *
435  *
436  *      TP_PROTO(struct rq *rq, struct task_struct *prev,
437  *               struct task_struct *next),
438  *
439  *      *
440  *      * Define the call signature of the 'function'.
441  *      * (Design sidenote: we use this instead of a
442  *      *  TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
443  *      *
444  *
445  *      TP_ARGS(rq, prev, next),
446  *
447  *      *
448  *      * Fast binary tracing: define the trace record via
449  *      * TP_STRUCT__entry(). You can think about it like a
450  *      * regular C structure local variable definition.
451  *      *
452  *      * This is how the trace record is structured and will
453  *      * be saved into the ring buffer. These are the fields
454  *      * that will be exposed to user-space in
455  *      * /sys/kernel/debug/tracing/events/<*>/format.
456  *      *
457  *      * The declared 'local variable' is called '__entry'
458  *      *
459  *      * __field(pid_t, prev_prid) is equivalent to a standard declariton:
460  *      *
461  *      *       pid_t   prev_pid;
462  *      *
463  *      * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
464  *      *
465  *      *       char    prev_comm[TASK_COMM_LEN];
466  *      *
467  *
468  *      TP_STRUCT__entry(
469  *              __array(        char,   prev_comm,      TASK_COMM_LEN   )
470  *              __field(        pid_t,  prev_pid                        )
471  *              __field(        int,    prev_prio                       )
472  *              __array(        char,   next_comm,      TASK_COMM_LEN   )
473  *              __field(        pid_t,  next_pid                        )
474  *              __field(        int,    next_prio                       )
475  *      ),
476  *
477  *      *
478  *      * Assign the entry into the trace record, by embedding
479  *      * a full C statement block into TP_fast_assign(). You
480  *      * can refer to the trace record as '__entry' -
481  *      * otherwise you can put arbitrary C code in here.
482  *      *
483  *      * Note: this C code will execute every time a trace event
484  *      * happens, on an active tracepoint.
485  *      *
486  *
487  *      TP_fast_assign(
488  *              memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
489  *              __entry->prev_pid       = prev->pid;
490  *              __entry->prev_prio      = prev->prio;
491  *              memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
492  *              __entry->next_pid       = next->pid;
493  *              __entry->next_prio      = next->prio;
494  *      ),
495  *
496  *      *
497  *      * Formatted output of a trace record via TP_printk().
498  *      * This is how the tracepoint will appear under ftrace
499  *      * plugins that make use of this tracepoint.
500  *      *
501  *      * (raw-binary tracing wont actually perform this step.)
502  *      *
503  *
504  *      TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
505  *              __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
506  *              __entry->next_comm, __entry->next_pid, __entry->next_prio),
507  *
508  * );
509  *
510  * This macro construct is thus used for the regular printk format
511  * tracing setup, it is used to construct a function pointer based
512  * tracepoint callback (this is used by programmatic plugins and
513  * can also by used by generic instrumentation like SystemTap), and
514  * it is also used to expose a structured trace record in
515  * /sys/kernel/debug/tracing/events/.
516  *
517  * A set of (un)registration functions can be passed to the variant
518  * TRACE_EVENT_FN to perform any (un)registration work.
519  */
520 
521 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
522 #define DEFINE_EVENT(template, name, proto, args)               \
523         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
524 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
525         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
526 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
527         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
528 #define DEFINE_EVENT_CONDITION(template, name, proto,           \
529                                args, cond)                      \
530         DECLARE_TRACE_CONDITION(name, PARAMS(proto),            \
531                                 PARAMS(args), PARAMS(cond))
532 
533 #define TRACE_EVENT(name, proto, args, struct, assign, print)   \
534         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
535 #define TRACE_EVENT_FN(name, proto, args, struct,               \
536                 assign, print, reg, unreg)                      \
537         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
538 #define TRACE_EVENT_FN_COND(name, proto, args, cond, struct,            \
539                 assign, print, reg, unreg)                      \
540         DECLARE_TRACE_CONDITION(name, PARAMS(proto),    \
541                         PARAMS(args), PARAMS(cond))
542 #define TRACE_EVENT_CONDITION(name, proto, args, cond,          \
543                               struct, assign, print)            \
544         DECLARE_TRACE_CONDITION(name, PARAMS(proto),            \
545                                 PARAMS(args), PARAMS(cond))
546 
547 #define TRACE_EVENT_FLAGS(event, flag)
548 
549 #define TRACE_EVENT_PERF_PERM(event, expr...)
550 
551 #endif /* ifdef TRACE_EVENT (see note above) */
552 

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