1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/ftrace.h>
11 #include <trace/boot.h>
12 #include <linux/kmemtrace.h>
13 #include <trace/power.h>
16 __TRACE_FIRST_TYPE
= 0,
45 * The trace entry - the most basic unit of tracing. This is what
46 * is printed in the end as a single line in the trace output, such as:
48 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
53 unsigned char preempt_count
;
59 * Function trace entry - function address and parent function addres:
62 struct trace_entry ent
;
64 unsigned long parent_ip
;
67 /* Function call entry */
68 struct ftrace_graph_ent_entry
{
69 struct trace_entry ent
;
70 struct ftrace_graph_ent graph_ent
;
73 /* Function return entry */
74 struct ftrace_graph_ret_entry
{
75 struct trace_entry ent
;
76 struct ftrace_graph_ret ret
;
78 extern struct tracer boot_tracer
;
81 * Context switch trace entry - which task (and prio) we switched from/to:
83 struct ctx_switch_entry
{
84 struct trace_entry ent
;
85 unsigned int prev_pid
;
86 unsigned char prev_prio
;
87 unsigned char prev_state
;
88 unsigned int next_pid
;
89 unsigned char next_prio
;
90 unsigned char next_state
;
91 unsigned int next_cpu
;
95 * Special (free-form) trace entry:
97 struct special_entry
{
98 struct trace_entry ent
;
108 #define FTRACE_STACK_ENTRIES 8
111 struct trace_entry ent
;
112 unsigned long caller
[FTRACE_STACK_ENTRIES
];
115 struct userstack_entry
{
116 struct trace_entry ent
;
117 unsigned long caller
[FTRACE_STACK_ENTRIES
];
121 * trace_printk entry:
123 struct bprint_entry
{
124 struct trace_entry ent
;
131 struct trace_entry ent
;
136 #define TRACE_OLD_SIZE 88
138 struct trace_field_cont
{
140 /* Temporary till we get rid of this completely */
141 char buf
[TRACE_OLD_SIZE
- 1];
144 struct trace_mmiotrace_rw
{
145 struct trace_entry ent
;
146 struct mmiotrace_rw rw
;
149 struct trace_mmiotrace_map
{
150 struct trace_entry ent
;
151 struct mmiotrace_map map
;
154 struct trace_boot_call
{
155 struct trace_entry ent
;
156 struct boot_trace_call boot_call
;
159 struct trace_boot_ret
{
160 struct trace_entry ent
;
161 struct boot_trace_ret boot_ret
;
164 #define TRACE_FUNC_SIZE 30
165 #define TRACE_FILE_SIZE 20
166 struct trace_branch
{
167 struct trace_entry ent
;
169 char func
[TRACE_FUNC_SIZE
+1];
170 char file
[TRACE_FILE_SIZE
+1];
174 struct hw_branch_entry
{
175 struct trace_entry ent
;
181 struct trace_entry ent
;
182 struct power_trace state_data
;
185 enum kmemtrace_type_id
{
186 KMEMTRACE_TYPE_KMALLOC
= 0, /* kmalloc() or kfree(). */
187 KMEMTRACE_TYPE_CACHE
, /* kmem_cache_*(). */
188 KMEMTRACE_TYPE_PAGES
, /* __get_free_pages() and friends. */
191 struct kmemtrace_alloc_entry
{
192 struct trace_entry ent
;
193 enum kmemtrace_type_id type_id
;
194 unsigned long call_site
;
202 struct kmemtrace_free_entry
{
203 struct trace_entry ent
;
204 enum kmemtrace_type_id type_id
;
205 unsigned long call_site
;
209 struct syscall_trace_enter
{
210 struct trace_entry ent
;
212 unsigned long args
[];
215 struct syscall_trace_exit
{
216 struct trace_entry ent
;
223 * trace_flag_type is an enumeration that holds different
224 * states when a trace occurs. These are:
225 * IRQS_OFF - interrupts were disabled
226 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
227 * NEED_RESCED - reschedule is requested
228 * HARDIRQ - inside an interrupt handler
229 * SOFTIRQ - inside a softirq handler
231 enum trace_flag_type
{
232 TRACE_FLAG_IRQS_OFF
= 0x01,
233 TRACE_FLAG_IRQS_NOSUPPORT
= 0x02,
234 TRACE_FLAG_NEED_RESCHED
= 0x04,
235 TRACE_FLAG_HARDIRQ
= 0x08,
236 TRACE_FLAG_SOFTIRQ
= 0x10,
239 #define TRACE_BUF_SIZE 1024
242 * The CPU trace array - it consists of thousands of trace entries
243 * plus some other descriptor data: (for example which task started
246 struct trace_array_cpu
{
248 void *buffer_page
; /* ring buffer spare */
250 /* these fields get copied into max-trace: */
251 unsigned long trace_idx
;
252 unsigned long overrun
;
253 unsigned long saved_latency
;
254 unsigned long critical_start
;
255 unsigned long critical_end
;
256 unsigned long critical_sequence
;
258 unsigned long policy
;
259 unsigned long rt_priority
;
260 cycle_t preempt_timestamp
;
263 char comm
[TASK_COMM_LEN
];
266 struct trace_iterator
;
269 * The trace array - an array of per-CPU trace arrays. This is the
270 * highest level data structure that individual tracers deal with.
271 * They have on/off state as well:
274 struct ring_buffer
*buffer
;
275 unsigned long entries
;
278 struct task_struct
*waiter
;
279 struct trace_array_cpu
*data
[NR_CPUS
];
282 #define FTRACE_CMP_TYPE(var, type) \
283 __builtin_types_compatible_p(typeof(var), type *)
286 #define IF_ASSIGN(var, entry, etype, id) \
287 if (FTRACE_CMP_TYPE(var, etype)) { \
288 var = (typeof(var))(entry); \
289 WARN_ON(id && (entry)->type != id); \
293 /* Will cause compile errors if type is not found. */
294 extern void __ftrace_bad_type(void);
297 * The trace_assign_type is a verifier that the entry type is
298 * the same as the type being assigned. To add new types simply
299 * add a line with the following format:
301 * IF_ASSIGN(var, ent, type, id);
303 * Where "type" is the trace type that includes the trace_entry
304 * as the "ent" item. And "id" is the trace identifier that is
305 * used in the trace_type enum.
307 * If the type can have more than one id, then use zero.
309 #define trace_assign_type(var, ent) \
311 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
312 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
313 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
314 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
315 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
316 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
317 IF_ASSIGN(var, ent, struct special_entry, 0); \
318 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
320 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
322 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
323 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
324 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
325 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
327 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
329 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
330 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
331 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
333 IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
335 IF_ASSIGN(var, ent, struct syscall_trace_enter, \
336 TRACE_SYSCALL_ENTER); \
337 IF_ASSIGN(var, ent, struct syscall_trace_exit, \
338 TRACE_SYSCALL_EXIT); \
339 __ftrace_bad_type(); \
342 /* Return values for print_line callback */
344 TRACE_TYPE_PARTIAL_LINE
= 0, /* Retry after flushing the seq */
345 TRACE_TYPE_HANDLED
= 1,
346 TRACE_TYPE_UNHANDLED
= 2, /* Relay to other output functions */
347 TRACE_TYPE_NO_CONSUME
= 3 /* Handled but ask to not consume */
352 * An option specific to a tracer. This is a boolean value.
353 * The bit is the bit index that sets its value on the
354 * flags value in struct tracer_flags.
357 const char *name
; /* Will appear on the trace_options file */
358 u32 bit
; /* Mask assigned in val field in tracer_flags */
362 * The set of specific options for a tracer. Your tracer
363 * have to set the initial value of the flags val.
365 struct tracer_flags
{
367 struct tracer_opt
*opts
;
370 /* Makes more easy to define a tracer opt */
371 #define TRACER_OPT(s, b) .name = #s, .bit = b
375 * struct tracer - a specific tracer and its callbacks to interact with debugfs
376 * @name: the name chosen to select it on the available_tracers file
377 * @init: called when one switches to this tracer (echo name > current_tracer)
378 * @reset: called when one switches to another tracer
379 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
380 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
381 * @open: called when the trace file is opened
382 * @pipe_open: called when the trace_pipe file is opened
383 * @wait_pipe: override how the user waits for traces on trace_pipe
384 * @close: called when the trace file is released
385 * @read: override the default read callback on trace_pipe
386 * @splice_read: override the default splice_read callback on trace_pipe
387 * @selftest: selftest to run on boot (see trace_selftest.c)
388 * @print_headers: override the first lines that describe your columns
389 * @print_line: callback that prints a trace
390 * @set_flag: signals one of your private flags changed (trace_options file)
391 * @flags: your private flags
395 int (*init
)(struct trace_array
*tr
);
396 void (*reset
)(struct trace_array
*tr
);
397 void (*start
)(struct trace_array
*tr
);
398 void (*stop
)(struct trace_array
*tr
);
399 void (*open
)(struct trace_iterator
*iter
);
400 void (*pipe_open
)(struct trace_iterator
*iter
);
401 void (*wait_pipe
)(struct trace_iterator
*iter
);
402 void (*close
)(struct trace_iterator
*iter
);
403 ssize_t (*read
)(struct trace_iterator
*iter
,
404 struct file
*filp
, char __user
*ubuf
,
405 size_t cnt
, loff_t
*ppos
);
406 ssize_t (*splice_read
)(struct trace_iterator
*iter
,
409 struct pipe_inode_info
*pipe
,
412 #ifdef CONFIG_FTRACE_STARTUP_TEST
413 int (*selftest
)(struct tracer
*trace
,
414 struct trace_array
*tr
);
416 void (*print_header
)(struct seq_file
*m
);
417 enum print_line_t (*print_line
)(struct trace_iterator
*iter
);
418 /* If you handled the flag setting, return 0 */
419 int (*set_flag
)(u32 old_flags
, u32 bit
, int set
);
422 struct tracer_flags
*flags
;
423 struct tracer_stat
*stats
;
427 unsigned char buffer
[PAGE_SIZE
];
429 unsigned int readpos
;
433 trace_seq_init(struct trace_seq
*s
)
440 #define TRACE_PIPE_ALL_CPU -1
443 * Trace iterator - used by printout routines who present trace
444 * results to users and which routines might sleep, etc:
446 struct trace_iterator
{
447 struct trace_array
*tr
;
448 struct tracer
*trace
;
452 struct ring_buffer_iter
*buffer_iter
[NR_CPUS
];
454 /* The below is zeroed out in pipe_read */
455 struct trace_seq seq
;
456 struct trace_entry
*ent
;
460 unsigned long iter_flags
;
464 cpumask_var_t started
;
467 int tracer_init(struct tracer
*t
, struct trace_array
*tr
);
468 int tracing_is_enabled(void);
469 void trace_wake_up(void);
470 void tracing_reset(struct trace_array
*tr
, int cpu
);
471 void tracing_reset_online_cpus(struct trace_array
*tr
);
472 int tracing_open_generic(struct inode
*inode
, struct file
*filp
);
473 struct dentry
*trace_create_file(const char *name
,
475 struct dentry
*parent
,
477 const struct file_operations
*fops
);
479 struct dentry
*tracing_init_dentry(void);
480 void init_tracer_sysprof_debugfs(struct dentry
*d_tracer
);
482 struct ring_buffer_event
;
484 struct ring_buffer_event
*trace_buffer_lock_reserve(struct trace_array
*tr
,
489 void trace_buffer_unlock_commit(struct trace_array
*tr
,
490 struct ring_buffer_event
*event
,
491 unsigned long flags
, int pc
);
493 struct ring_buffer_event
*
494 trace_current_buffer_lock_reserve(unsigned char type
, unsigned long len
,
495 unsigned long flags
, int pc
);
496 void trace_current_buffer_unlock_commit(struct ring_buffer_event
*event
,
497 unsigned long flags
, int pc
);
498 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event
*event
,
499 unsigned long flags
, int pc
);
500 void trace_current_buffer_discard_commit(struct ring_buffer_event
*event
);
502 struct trace_entry
*tracing_get_trace_entry(struct trace_array
*tr
,
503 struct trace_array_cpu
*data
);
505 struct trace_entry
*trace_find_next_entry(struct trace_iterator
*iter
,
506 int *ent_cpu
, u64
*ent_ts
);
508 void tracing_generic_entry_update(struct trace_entry
*entry
,
512 void default_wait_pipe(struct trace_iterator
*iter
);
513 void poll_wait_pipe(struct trace_iterator
*iter
);
515 void ftrace(struct trace_array
*tr
,
516 struct trace_array_cpu
*data
,
518 unsigned long parent_ip
,
519 unsigned long flags
, int pc
);
520 void tracing_sched_switch_trace(struct trace_array
*tr
,
521 struct task_struct
*prev
,
522 struct task_struct
*next
,
523 unsigned long flags
, int pc
);
524 void tracing_record_cmdline(struct task_struct
*tsk
);
526 void tracing_sched_wakeup_trace(struct trace_array
*tr
,
527 struct task_struct
*wakee
,
528 struct task_struct
*cur
,
529 unsigned long flags
, int pc
);
530 void trace_special(struct trace_array
*tr
,
531 struct trace_array_cpu
*data
,
534 unsigned long arg3
, int pc
);
535 void trace_function(struct trace_array
*tr
,
537 unsigned long parent_ip
,
538 unsigned long flags
, int pc
);
540 void trace_graph_return(struct ftrace_graph_ret
*trace
);
541 int trace_graph_entry(struct ftrace_graph_ent
*trace
);
543 void tracing_start_cmdline_record(void);
544 void tracing_stop_cmdline_record(void);
545 void tracing_sched_switch_assign_trace(struct trace_array
*tr
);
546 void tracing_stop_sched_switch_record(void);
547 void tracing_start_sched_switch_record(void);
548 int register_tracer(struct tracer
*type
);
549 void unregister_tracer(struct tracer
*type
);
551 extern unsigned long nsecs_to_usecs(unsigned long nsecs
);
553 extern unsigned long tracing_max_latency
;
554 extern unsigned long tracing_thresh
;
556 void update_max_tr(struct trace_array
*tr
, struct task_struct
*tsk
, int cpu
);
557 void update_max_tr_single(struct trace_array
*tr
,
558 struct task_struct
*tsk
, int cpu
);
560 void __trace_stack(struct trace_array
*tr
,
564 extern cycle_t
ftrace_now(int cpu
);
566 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
568 (*tracer_switch_func_t
)(void *private,
570 struct task_struct
*prev
,
571 struct task_struct
*next
);
573 struct tracer_switch_ops
{
574 tracer_switch_func_t func
;
576 struct tracer_switch_ops
*next
;
578 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
580 extern void trace_find_cmdline(int pid
, char comm
[]);
582 #ifdef CONFIG_DYNAMIC_FTRACE
583 extern unsigned long ftrace_update_tot_cnt
;
584 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
585 extern int DYN_FTRACE_TEST_NAME(void);
588 #ifdef CONFIG_FTRACE_STARTUP_TEST
589 extern int trace_selftest_startup_function(struct tracer
*trace
,
590 struct trace_array
*tr
);
591 extern int trace_selftest_startup_function_graph(struct tracer
*trace
,
592 struct trace_array
*tr
);
593 extern int trace_selftest_startup_irqsoff(struct tracer
*trace
,
594 struct trace_array
*tr
);
595 extern int trace_selftest_startup_preemptoff(struct tracer
*trace
,
596 struct trace_array
*tr
);
597 extern int trace_selftest_startup_preemptirqsoff(struct tracer
*trace
,
598 struct trace_array
*tr
);
599 extern int trace_selftest_startup_wakeup(struct tracer
*trace
,
600 struct trace_array
*tr
);
601 extern int trace_selftest_startup_nop(struct tracer
*trace
,
602 struct trace_array
*tr
);
603 extern int trace_selftest_startup_sched_switch(struct tracer
*trace
,
604 struct trace_array
*tr
);
605 extern int trace_selftest_startup_sysprof(struct tracer
*trace
,
606 struct trace_array
*tr
);
607 extern int trace_selftest_startup_branch(struct tracer
*trace
,
608 struct trace_array
*tr
);
609 #endif /* CONFIG_FTRACE_STARTUP_TEST */
611 extern void *head_page(struct trace_array_cpu
*data
);
612 extern unsigned long long ns2usecs(cycle_t nsec
);
614 trace_vbprintk(unsigned long ip
, const char *fmt
, va_list args
);
616 trace_vprintk(unsigned long ip
, const char *fmt
, va_list args
);
618 extern unsigned long trace_flags
;
620 /* Standard output formatting function used for function return traces */
621 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
622 extern enum print_line_t
print_graph_function(struct trace_iterator
*iter
);
623 extern enum print_line_t
624 trace_print_graph_duration(unsigned long long duration
, struct trace_seq
*s
);
626 #ifdef CONFIG_DYNAMIC_FTRACE
627 /* TODO: make this variable */
628 #define FTRACE_GRAPH_MAX_FUNCS 32
629 extern int ftrace_graph_count
;
630 extern unsigned long ftrace_graph_funcs
[FTRACE_GRAPH_MAX_FUNCS
];
632 static inline int ftrace_graph_addr(unsigned long addr
)
636 if (!ftrace_graph_count
|| test_tsk_trace_graph(current
))
639 for (i
= 0; i
< ftrace_graph_count
; i
++) {
640 if (addr
== ftrace_graph_funcs
[i
])
647 static inline int ftrace_trace_addr(unsigned long addr
)
651 static inline int ftrace_graph_addr(unsigned long addr
)
655 #endif /* CONFIG_DYNAMIC_FTRACE */
656 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
657 static inline enum print_line_t
658 print_graph_function(struct trace_iterator
*iter
)
660 return TRACE_TYPE_UNHANDLED
;
662 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
664 extern struct pid
*ftrace_pid_trace
;
666 static inline int ftrace_trace_task(struct task_struct
*task
)
668 if (!ftrace_pid_trace
)
671 return test_tsk_trace_trace(task
);
675 * trace_iterator_flags is an enumeration that defines bit
676 * positions into trace_flags that controls the output.
678 * NOTE: These bits must match the trace_options array in
681 enum trace_iterator_flags
{
682 TRACE_ITER_PRINT_PARENT
= 0x01,
683 TRACE_ITER_SYM_OFFSET
= 0x02,
684 TRACE_ITER_SYM_ADDR
= 0x04,
685 TRACE_ITER_VERBOSE
= 0x08,
686 TRACE_ITER_RAW
= 0x10,
687 TRACE_ITER_HEX
= 0x20,
688 TRACE_ITER_BIN
= 0x40,
689 TRACE_ITER_BLOCK
= 0x80,
690 TRACE_ITER_STACKTRACE
= 0x100,
691 TRACE_ITER_SCHED_TREE
= 0x200,
692 TRACE_ITER_PRINTK
= 0x400,
693 TRACE_ITER_PREEMPTONLY
= 0x800,
694 TRACE_ITER_BRANCH
= 0x1000,
695 TRACE_ITER_ANNOTATE
= 0x2000,
696 TRACE_ITER_USERSTACKTRACE
= 0x4000,
697 TRACE_ITER_SYM_USEROBJ
= 0x8000,
698 TRACE_ITER_PRINTK_MSGONLY
= 0x10000,
699 TRACE_ITER_CONTEXT_INFO
= 0x20000, /* Print pid/cpu/time */
700 TRACE_ITER_LATENCY_FMT
= 0x40000,
701 TRACE_ITER_GLOBAL_CLK
= 0x80000,
702 TRACE_ITER_SLEEP_TIME
= 0x100000,
703 TRACE_ITER_GRAPH_TIME
= 0x200000,
707 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
708 * control the output of kernel symbols.
710 #define TRACE_ITER_SYM_MASK \
711 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
713 extern struct tracer nop_trace
;
716 * ftrace_preempt_disable - disable preemption scheduler safe
718 * When tracing can happen inside the scheduler, there exists
719 * cases that the tracing might happen before the need_resched
720 * flag is checked. If this happens and the tracer calls
721 * preempt_enable (after a disable), a schedule might take place
722 * causing an infinite recursion.
724 * To prevent this, we read the need_resched flag before
725 * disabling preemption. When we want to enable preemption we
726 * check the flag, if it is set, then we call preempt_enable_no_resched.
727 * Otherwise, we call preempt_enable.
729 * The rational for doing the above is that if need_resched is set
730 * and we have yet to reschedule, we are either in an atomic location
731 * (where we do not need to check for scheduling) or we are inside
732 * the scheduler and do not want to resched.
734 static inline int ftrace_preempt_disable(void)
738 resched
= need_resched();
739 preempt_disable_notrace();
745 * ftrace_preempt_enable - enable preemption scheduler safe
746 * @resched: the return value from ftrace_preempt_disable
748 * This is a scheduler safe way to enable preemption and not miss
749 * any preemption checks. The disabled saved the state of preemption.
750 * If resched is set, then we are either inside an atomic or
751 * are inside the scheduler (we would have already scheduled
752 * otherwise). In this case, we do not want to call normal
753 * preempt_enable, but preempt_enable_no_resched instead.
755 static inline void ftrace_preempt_enable(int resched
)
758 preempt_enable_no_resched_notrace();
760 preempt_enable_notrace();
763 #ifdef CONFIG_BRANCH_TRACER
764 extern int enable_branch_tracing(struct trace_array
*tr
);
765 extern void disable_branch_tracing(void);
766 static inline int trace_branch_enable(struct trace_array
*tr
)
768 if (trace_flags
& TRACE_ITER_BRANCH
)
769 return enable_branch_tracing(tr
);
772 static inline void trace_branch_disable(void)
774 /* due to races, always disable */
775 disable_branch_tracing();
778 static inline int trace_branch_enable(struct trace_array
*tr
)
782 static inline void trace_branch_disable(void)
785 #endif /* CONFIG_BRANCH_TRACER */
787 /* set ring buffers to default size if not already done so */
788 int tracing_update_buffers(void);
790 /* trace event type bit fields, not numeric */
792 TRACE_EVENT_TYPE_PRINTF
= 1,
793 TRACE_EVENT_TYPE_RAW
= 2,
796 struct ftrace_event_field
{
797 struct list_head link
;
804 struct ftrace_event_call
{
809 int (*regfunc
)(void);
810 void (*unregfunc
)(void);
812 int (*raw_init
)(void);
813 int (*show_format
)(struct trace_seq
*s
);
814 int (*define_fields
)(void);
815 struct list_head fields
;
816 struct filter_pred
**preds
;
818 #ifdef CONFIG_EVENT_PROFILE
819 atomic_t profile_count
;
820 int (*profile_enable
)(struct ftrace_event_call
*);
821 void (*profile_disable
)(struct ftrace_event_call
*);
825 struct event_subsystem
{
826 struct list_head list
;
828 struct dentry
*entry
;
829 struct filter_pred
**preds
;
832 #define events_for_each(event) \
833 for (event = __start_ftrace_events; \
834 (unsigned long)event < (unsigned long)__stop_ftrace_events; \
837 #define MAX_FILTER_PRED 8
841 typedef int (*filter_pred_fn_t
) (struct filter_pred
*pred
, void *event
);
856 int trace_define_field(struct ftrace_event_call
*call
, char *type
,
857 char *name
, int offset
, int size
);
858 extern void filter_free_pred(struct filter_pred
*pred
);
859 extern void filter_print_preds(struct filter_pred
**preds
,
860 struct trace_seq
*s
);
861 extern int filter_parse(char **pbuf
, struct filter_pred
*pred
);
862 extern int filter_add_pred(struct ftrace_event_call
*call
,
863 struct filter_pred
*pred
);
864 extern void filter_free_preds(struct ftrace_event_call
*call
);
865 extern int filter_match_preds(struct ftrace_event_call
*call
, void *rec
);
866 extern void filter_free_subsystem_preds(struct event_subsystem
*system
);
867 extern int filter_add_subsystem_pred(struct event_subsystem
*system
,
868 struct filter_pred
*pred
);
869 extern int filter_current_check_discard(struct ftrace_event_call
*call
,
871 struct ring_buffer_event
*event
);
874 filter_check_discard(struct ftrace_event_call
*call
, void *rec
,
875 struct ring_buffer
*buffer
,
876 struct ring_buffer_event
*event
)
878 if (unlikely(call
->preds
) && !filter_match_preds(call
, rec
)) {
879 ring_buffer_discard_commit(buffer
, event
);
886 #define __common_field(type, item) \
887 ret = trace_define_field(event_call, #type, "common_" #item, \
888 offsetof(typeof(field.ent), item), \
889 sizeof(field.ent.item)); \
893 void event_trace_printk(unsigned long ip
, const char *fmt
, ...);
894 extern struct ftrace_event_call __start_ftrace_events
[];
895 extern struct ftrace_event_call __stop_ftrace_events
[];
897 #define for_each_event(event) \
898 for (event = __start_ftrace_events; \
899 (unsigned long)event < (unsigned long)__stop_ftrace_events; \
902 extern const char *__start___trace_bprintk_fmt
[];
903 extern const char *__stop___trace_bprintk_fmt
[];
906 * The double __builtin_constant_p is because gcc will give us an error
907 * if we try to allocate the static variable to fmt if it is not a
908 * constant. Even with the outer if statement optimizing out.
910 #define event_trace_printk(ip, fmt, args...) \
912 __trace_printk_check_format(fmt, ##args); \
913 tracing_record_cmdline(current); \
914 if (__builtin_constant_p(fmt)) { \
915 static const char *trace_printk_fmt \
916 __attribute__((section("__trace_printk_fmt"))) = \
917 __builtin_constant_p(fmt) ? fmt : NULL; \
919 __trace_bprintk(ip, trace_printk_fmt, ##args); \
921 __trace_printk(ip, fmt, ##args); \
924 #undef TRACE_EVENT_FORMAT
925 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
926 extern struct ftrace_event_call event_##call;
927 #undef TRACE_EVENT_FORMAT_NOFILTER
928 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
929 #include "trace_event_types.h"
931 #endif /* _LINUX_KERNEL_TRACE_H */