1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <linux/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/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
17 __TRACE_FIRST_TYPE
= 0,
38 #define __field(type, item) type item;
41 #define __field_struct(type, item) __field(type, item)
44 #define __field_desc(type, container, item)
47 #define __array(type, item, size) type item[size];
50 #define __array_desc(type, container, item, size)
52 #undef __dynamic_array
53 #define __dynamic_array(type, item) type item[];
56 #define F_STRUCT(args...) args
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
60 struct struct_name { \
61 struct trace_entry ent; \
66 #define TP_ARGS(args...) args
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
71 #undef FTRACE_ENTRY_REG
72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
77 #include "trace_entries.h"
80 * syscalls are special, and need special handling, this is why
81 * they are not included in trace_entries.h
83 struct syscall_trace_enter
{
84 struct trace_entry ent
;
89 struct syscall_trace_exit
{
90 struct trace_entry ent
;
95 struct kprobe_trace_entry_head
{
96 struct trace_entry ent
;
100 struct kretprobe_trace_entry_head
{
101 struct trace_entry ent
;
103 unsigned long ret_ip
;
106 struct uprobe_trace_entry_head
{
107 struct trace_entry ent
;
112 * trace_flag_type is an enumeration that holds different
113 * states when a trace occurs. These are:
114 * IRQS_OFF - interrupts were disabled
115 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
116 * NEED_RESCHED - reschedule is requested
117 * HARDIRQ - inside an interrupt handler
118 * SOFTIRQ - inside a softirq handler
120 enum trace_flag_type
{
121 TRACE_FLAG_IRQS_OFF
= 0x01,
122 TRACE_FLAG_IRQS_NOSUPPORT
= 0x02,
123 TRACE_FLAG_NEED_RESCHED
= 0x04,
124 TRACE_FLAG_HARDIRQ
= 0x08,
125 TRACE_FLAG_SOFTIRQ
= 0x10,
128 #define TRACE_BUF_SIZE 1024
131 * The CPU trace array - it consists of thousands of trace entries
132 * plus some other descriptor data: (for example which task started
135 struct trace_array_cpu
{
137 void *buffer_page
; /* ring buffer spare */
139 unsigned long entries
;
140 unsigned long saved_latency
;
141 unsigned long critical_start
;
142 unsigned long critical_end
;
143 unsigned long critical_sequence
;
145 unsigned long policy
;
146 unsigned long rt_priority
;
147 unsigned long skipped_entries
;
148 cycle_t preempt_timestamp
;
151 char comm
[TASK_COMM_LEN
];
155 * The trace array - an array of per-CPU trace arrays. This is the
156 * highest level data structure that individual tracers deal with.
157 * They have on/off state as well:
160 struct ring_buffer
*buffer
;
164 struct task_struct
*waiter
;
165 struct trace_array_cpu
*data
[NR_CPUS
];
168 #define FTRACE_CMP_TYPE(var, type) \
169 __builtin_types_compatible_p(typeof(var), type *)
172 #define IF_ASSIGN(var, entry, etype, id) \
173 if (FTRACE_CMP_TYPE(var, etype)) { \
174 var = (typeof(var))(entry); \
175 WARN_ON(id && (entry)->type != id); \
179 /* Will cause compile errors if type is not found. */
180 extern void __ftrace_bad_type(void);
183 * The trace_assign_type is a verifier that the entry type is
184 * the same as the type being assigned. To add new types simply
185 * add a line with the following format:
187 * IF_ASSIGN(var, ent, type, id);
189 * Where "type" is the trace type that includes the trace_entry
190 * as the "ent" item. And "id" is the trace identifier that is
191 * used in the trace_type enum.
193 * If the type can have more than one id, then use zero.
195 #define trace_assign_type(var, ent) \
197 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
198 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
199 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
200 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
201 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
202 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
203 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
205 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
207 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
208 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
210 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
212 __ftrace_bad_type(); \
216 * An option specific to a tracer. This is a boolean value.
217 * The bit is the bit index that sets its value on the
218 * flags value in struct tracer_flags.
221 const char *name
; /* Will appear on the trace_options file */
222 u32 bit
; /* Mask assigned in val field in tracer_flags */
226 * The set of specific options for a tracer. Your tracer
227 * have to set the initial value of the flags val.
229 struct tracer_flags
{
231 struct tracer_opt
*opts
;
234 /* Makes more easy to define a tracer opt */
235 #define TRACER_OPT(s, b) .name = #s, .bit = b
239 * struct tracer - a specific tracer and its callbacks to interact with debugfs
240 * @name: the name chosen to select it on the available_tracers file
241 * @init: called when one switches to this tracer (echo name > current_tracer)
242 * @reset: called when one switches to another tracer
243 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
244 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
245 * @open: called when the trace file is opened
246 * @pipe_open: called when the trace_pipe file is opened
247 * @wait_pipe: override how the user waits for traces on trace_pipe
248 * @close: called when the trace file is released
249 * @pipe_close: called when the trace_pipe file is released
250 * @read: override the default read callback on trace_pipe
251 * @splice_read: override the default splice_read callback on trace_pipe
252 * @selftest: selftest to run on boot (see trace_selftest.c)
253 * @print_headers: override the first lines that describe your columns
254 * @print_line: callback that prints a trace
255 * @set_flag: signals one of your private flags changed (trace_options file)
256 * @flags: your private flags
260 int (*init
)(struct trace_array
*tr
);
261 void (*reset
)(struct trace_array
*tr
);
262 void (*start
)(struct trace_array
*tr
);
263 void (*stop
)(struct trace_array
*tr
);
264 void (*open
)(struct trace_iterator
*iter
);
265 void (*pipe_open
)(struct trace_iterator
*iter
);
266 void (*wait_pipe
)(struct trace_iterator
*iter
);
267 void (*close
)(struct trace_iterator
*iter
);
268 void (*pipe_close
)(struct trace_iterator
*iter
);
269 ssize_t (*read
)(struct trace_iterator
*iter
,
270 struct file
*filp
, char __user
*ubuf
,
271 size_t cnt
, loff_t
*ppos
);
272 ssize_t (*splice_read
)(struct trace_iterator
*iter
,
275 struct pipe_inode_info
*pipe
,
278 #ifdef CONFIG_FTRACE_STARTUP_TEST
279 int (*selftest
)(struct tracer
*trace
,
280 struct trace_array
*tr
);
282 void (*print_header
)(struct seq_file
*m
);
283 enum print_line_t (*print_line
)(struct trace_iterator
*iter
);
284 /* If you handled the flag setting, return 0 */
285 int (*set_flag
)(u32 old_flags
, u32 bit
, int set
);
287 struct tracer_flags
*flags
;
290 bool allocated_snapshot
;
294 /* Only current can touch trace_recursion */
297 * For function tracing recursion:
298 * The order of these bits are important.
300 * When function tracing occurs, the following steps are made:
301 * If arch does not support a ftrace feature:
302 * call internal function (uses INTERNAL bits) which calls...
303 * If callback is registered to the "global" list, the list
304 * function is called and recursion checks the GLOBAL bits.
305 * then this function calls...
306 * The function callback, which can use the FTRACE bits to
307 * check for recursion.
309 * Now if the arch does not suppport a feature, and it calls
310 * the global list function which calls the ftrace callback
311 * all three of these steps will do a recursion protection.
312 * There's no reason to do one if the previous caller already
313 * did. The recursion that we are protecting against will
314 * go through the same steps again.
316 * To prevent the multiple recursion checks, if a recursion
317 * bit is set that is higher than the MAX bit of the current
318 * check, then we know that the check was made by the previous
319 * caller, and we can skip the current check.
323 TRACE_BUFFER_NMI_BIT
,
324 TRACE_BUFFER_IRQ_BIT
,
325 TRACE_BUFFER_SIRQ_BIT
,
327 /* Start of function recursion bits */
329 TRACE_FTRACE_NMI_BIT
,
330 TRACE_FTRACE_IRQ_BIT
,
331 TRACE_FTRACE_SIRQ_BIT
,
333 /* GLOBAL_BITs must be greater than FTRACE_BITs */
335 TRACE_GLOBAL_NMI_BIT
,
336 TRACE_GLOBAL_IRQ_BIT
,
337 TRACE_GLOBAL_SIRQ_BIT
,
339 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
341 TRACE_INTERNAL_NMI_BIT
,
342 TRACE_INTERNAL_IRQ_BIT
,
343 TRACE_INTERNAL_SIRQ_BIT
,
348 * Abuse of the trace_recursion.
349 * As we need a way to maintain state if we are tracing the function
350 * graph in irq because we want to trace a particular function that
351 * was called in irq context but we have irq tracing off. Since this
352 * can only be modified by current, we can reuse trace_recursion.
357 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
358 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
359 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
361 #define TRACE_CONTEXT_BITS 4
363 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
364 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
366 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
367 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
369 #define TRACE_LIST_START TRACE_INTERNAL_BIT
370 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
372 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
374 static __always_inline
int trace_get_context_bit(void)
378 if (in_interrupt()) {
392 static __always_inline
int trace_test_and_set_recursion(int start
, int max
)
394 unsigned int val
= current
->trace_recursion
;
397 /* A previous recursion check was made */
398 if ((val
& TRACE_CONTEXT_MASK
) > max
)
401 bit
= trace_get_context_bit() + start
;
402 if (unlikely(val
& (1 << bit
)))
406 current
->trace_recursion
= val
;
412 static __always_inline
void trace_clear_recursion(int bit
)
414 unsigned int val
= current
->trace_recursion
;
423 current
->trace_recursion
= val
;
426 #define TRACE_PIPE_ALL_CPU -1
428 static inline struct ring_buffer_iter
*
429 trace_buffer_iter(struct trace_iterator
*iter
, int cpu
)
431 if (iter
->buffer_iter
&& iter
->buffer_iter
[cpu
])
432 return iter
->buffer_iter
[cpu
];
436 int tracer_init(struct tracer
*t
, struct trace_array
*tr
);
437 int tracing_is_enabled(void);
438 void tracing_reset(struct trace_array
*tr
, int cpu
);
439 void tracing_reset_online_cpus(struct trace_array
*tr
);
440 void tracing_reset_current(int cpu
);
441 void tracing_reset_current_online_cpus(void);
442 int tracing_open_generic(struct inode
*inode
, struct file
*filp
);
443 struct dentry
*trace_create_file(const char *name
,
445 struct dentry
*parent
,
447 const struct file_operations
*fops
);
449 struct dentry
*tracing_init_dentry(void);
451 struct ring_buffer_event
;
453 struct ring_buffer_event
*
454 trace_buffer_lock_reserve(struct ring_buffer
*buffer
,
460 struct trace_entry
*tracing_get_trace_entry(struct trace_array
*tr
,
461 struct trace_array_cpu
*data
);
463 struct trace_entry
*trace_find_next_entry(struct trace_iterator
*iter
,
464 int *ent_cpu
, u64
*ent_ts
);
466 void __buffer_unlock_commit(struct ring_buffer
*buffer
,
467 struct ring_buffer_event
*event
);
469 int trace_empty(struct trace_iterator
*iter
);
471 void *trace_find_next_entry_inc(struct trace_iterator
*iter
);
473 void trace_init_global_iter(struct trace_iterator
*iter
);
475 void tracing_iter_reset(struct trace_iterator
*iter
, int cpu
);
477 void poll_wait_pipe(struct trace_iterator
*iter
);
479 void ftrace(struct trace_array
*tr
,
480 struct trace_array_cpu
*data
,
482 unsigned long parent_ip
,
483 unsigned long flags
, int pc
);
484 void tracing_sched_switch_trace(struct trace_array
*tr
,
485 struct task_struct
*prev
,
486 struct task_struct
*next
,
487 unsigned long flags
, int pc
);
489 void tracing_sched_wakeup_trace(struct trace_array
*tr
,
490 struct task_struct
*wakee
,
491 struct task_struct
*cur
,
492 unsigned long flags
, int pc
);
493 void trace_function(struct trace_array
*tr
,
495 unsigned long parent_ip
,
496 unsigned long flags
, int pc
);
497 void trace_graph_function(struct trace_array
*tr
,
499 unsigned long parent_ip
,
500 unsigned long flags
, int pc
);
501 void trace_latency_header(struct seq_file
*m
);
502 void trace_default_header(struct seq_file
*m
);
503 void print_trace_header(struct seq_file
*m
, struct trace_iterator
*iter
);
504 int trace_empty(struct trace_iterator
*iter
);
506 void trace_graph_return(struct ftrace_graph_ret
*trace
);
507 int trace_graph_entry(struct ftrace_graph_ent
*trace
);
508 void set_graph_array(struct trace_array
*tr
);
510 void tracing_start_cmdline_record(void);
511 void tracing_stop_cmdline_record(void);
512 void tracing_sched_switch_assign_trace(struct trace_array
*tr
);
513 void tracing_stop_sched_switch_record(void);
514 void tracing_start_sched_switch_record(void);
515 int register_tracer(struct tracer
*type
);
516 int is_tracing_stopped(void);
518 extern cpumask_var_t __read_mostly tracing_buffer_mask
;
520 #define for_each_tracing_cpu(cpu) \
521 for_each_cpu(cpu, tracing_buffer_mask)
523 extern unsigned long nsecs_to_usecs(unsigned long nsecs
);
525 extern unsigned long tracing_thresh
;
527 #ifdef CONFIG_TRACER_MAX_TRACE
528 extern unsigned long tracing_max_latency
;
530 void update_max_tr(struct trace_array
*tr
, struct task_struct
*tsk
, int cpu
);
531 void update_max_tr_single(struct trace_array
*tr
,
532 struct task_struct
*tsk
, int cpu
);
533 #endif /* CONFIG_TRACER_MAX_TRACE */
535 #ifdef CONFIG_STACKTRACE
536 void ftrace_trace_stack(struct ring_buffer
*buffer
, unsigned long flags
,
539 void ftrace_trace_stack_regs(struct ring_buffer
*buffer
, unsigned long flags
,
540 int skip
, int pc
, struct pt_regs
*regs
);
542 void ftrace_trace_userstack(struct ring_buffer
*buffer
, unsigned long flags
,
545 void __trace_stack(struct trace_array
*tr
, unsigned long flags
, int skip
,
548 static inline void ftrace_trace_stack(struct ring_buffer
*buffer
,
549 unsigned long flags
, int skip
, int pc
)
553 static inline void ftrace_trace_stack_regs(struct ring_buffer
*buffer
,
554 unsigned long flags
, int skip
,
555 int pc
, struct pt_regs
*regs
)
559 static inline void ftrace_trace_userstack(struct ring_buffer
*buffer
,
560 unsigned long flags
, int pc
)
564 static inline void __trace_stack(struct trace_array
*tr
, unsigned long flags
,
568 #endif /* CONFIG_STACKTRACE */
570 extern cycle_t
ftrace_now(int cpu
);
572 extern void trace_find_cmdline(int pid
, char comm
[]);
574 #ifdef CONFIG_DYNAMIC_FTRACE
575 extern unsigned long ftrace_update_tot_cnt
;
577 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
578 extern int DYN_FTRACE_TEST_NAME(void);
579 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
580 extern int DYN_FTRACE_TEST_NAME2(void);
582 extern int ring_buffer_expanded
;
583 extern bool tracing_selftest_disabled
;
584 DECLARE_PER_CPU(int, ftrace_cpu_disabled
);
586 #ifdef CONFIG_FTRACE_STARTUP_TEST
587 extern int trace_selftest_startup_function(struct tracer
*trace
,
588 struct trace_array
*tr
);
589 extern int trace_selftest_startup_function_graph(struct tracer
*trace
,
590 struct trace_array
*tr
);
591 extern int trace_selftest_startup_irqsoff(struct tracer
*trace
,
592 struct trace_array
*tr
);
593 extern int trace_selftest_startup_preemptoff(struct tracer
*trace
,
594 struct trace_array
*tr
);
595 extern int trace_selftest_startup_preemptirqsoff(struct tracer
*trace
,
596 struct trace_array
*tr
);
597 extern int trace_selftest_startup_wakeup(struct tracer
*trace
,
598 struct trace_array
*tr
);
599 extern int trace_selftest_startup_nop(struct tracer
*trace
,
600 struct trace_array
*tr
);
601 extern int trace_selftest_startup_sched_switch(struct tracer
*trace
,
602 struct trace_array
*tr
);
603 extern int trace_selftest_startup_branch(struct tracer
*trace
,
604 struct trace_array
*tr
);
605 #endif /* CONFIG_FTRACE_STARTUP_TEST */
607 extern void *head_page(struct trace_array_cpu
*data
);
608 extern unsigned long long ns2usecs(cycle_t nsec
);
610 trace_vbprintk(unsigned long ip
, const char *fmt
, va_list args
);
612 trace_vprintk(unsigned long ip
, const char *fmt
, va_list args
);
614 trace_array_vprintk(struct trace_array
*tr
,
615 unsigned long ip
, const char *fmt
, va_list args
);
616 int trace_array_printk(struct trace_array
*tr
,
617 unsigned long ip
, const char *fmt
, ...);
618 void trace_printk_seq(struct trace_seq
*s
);
619 enum print_line_t
print_trace_line(struct trace_iterator
*iter
);
621 extern unsigned long trace_flags
;
623 extern int trace_clock_id
;
625 /* Standard output formatting function used for function return traces */
626 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
629 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
630 #define TRACE_GRAPH_PRINT_CPU 0x2
631 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
632 #define TRACE_GRAPH_PRINT_PROC 0x8
633 #define TRACE_GRAPH_PRINT_DURATION 0x10
634 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
636 extern enum print_line_t
637 print_graph_function_flags(struct trace_iterator
*iter
, u32 flags
);
638 extern void print_graph_headers_flags(struct seq_file
*s
, u32 flags
);
639 extern enum print_line_t
640 trace_print_graph_duration(unsigned long long duration
, struct trace_seq
*s
);
641 extern void graph_trace_open(struct trace_iterator
*iter
);
642 extern void graph_trace_close(struct trace_iterator
*iter
);
643 extern int __trace_graph_entry(struct trace_array
*tr
,
644 struct ftrace_graph_ent
*trace
,
645 unsigned long flags
, int pc
);
646 extern void __trace_graph_return(struct trace_array
*tr
,
647 struct ftrace_graph_ret
*trace
,
648 unsigned long flags
, int pc
);
651 #ifdef CONFIG_DYNAMIC_FTRACE
652 /* TODO: make this variable */
653 #define FTRACE_GRAPH_MAX_FUNCS 32
654 extern int ftrace_graph_filter_enabled
;
655 extern int ftrace_graph_count
;
656 extern unsigned long ftrace_graph_funcs
[FTRACE_GRAPH_MAX_FUNCS
];
658 static inline int ftrace_graph_addr(unsigned long addr
)
662 if (!ftrace_graph_filter_enabled
)
665 for (i
= 0; i
< ftrace_graph_count
; i
++) {
666 if (addr
== ftrace_graph_funcs
[i
]) {
668 * If no irqs are to be traced, but a set_graph_function
669 * is set, and called by an interrupt handler, we still
673 trace_recursion_set(TRACE_IRQ_BIT
);
675 trace_recursion_clear(TRACE_IRQ_BIT
);
683 static inline int ftrace_graph_addr(unsigned long addr
)
687 #endif /* CONFIG_DYNAMIC_FTRACE */
688 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
689 static inline enum print_line_t
690 print_graph_function_flags(struct trace_iterator
*iter
, u32 flags
)
692 return TRACE_TYPE_UNHANDLED
;
694 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
696 extern struct list_head ftrace_pids
;
698 #ifdef CONFIG_FUNCTION_TRACER
699 static inline int ftrace_trace_task(struct task_struct
*task
)
701 if (list_empty(&ftrace_pids
))
704 return test_tsk_trace_trace(task
);
706 extern int ftrace_is_dead(void);
708 static inline int ftrace_trace_task(struct task_struct
*task
)
712 static inline int ftrace_is_dead(void) { return 0; }
715 int ftrace_event_is_function(struct ftrace_event_call
*call
);
718 * struct trace_parser - servers for reading the user input separated by spaces
719 * @cont: set if the input is not complete - no final space char was found
720 * @buffer: holds the parsed user input
721 * @idx: user input length
724 struct trace_parser
{
731 static inline bool trace_parser_loaded(struct trace_parser
*parser
)
733 return (parser
->idx
!= 0);
736 static inline bool trace_parser_cont(struct trace_parser
*parser
)
741 static inline void trace_parser_clear(struct trace_parser
*parser
)
743 parser
->cont
= false;
747 extern int trace_parser_get_init(struct trace_parser
*parser
, int size
);
748 extern void trace_parser_put(struct trace_parser
*parser
);
749 extern int trace_get_user(struct trace_parser
*parser
, const char __user
*ubuf
,
750 size_t cnt
, loff_t
*ppos
);
753 * trace_iterator_flags is an enumeration that defines bit
754 * positions into trace_flags that controls the output.
756 * NOTE: These bits must match the trace_options array in
759 enum trace_iterator_flags
{
760 TRACE_ITER_PRINT_PARENT
= 0x01,
761 TRACE_ITER_SYM_OFFSET
= 0x02,
762 TRACE_ITER_SYM_ADDR
= 0x04,
763 TRACE_ITER_VERBOSE
= 0x08,
764 TRACE_ITER_RAW
= 0x10,
765 TRACE_ITER_HEX
= 0x20,
766 TRACE_ITER_BIN
= 0x40,
767 TRACE_ITER_BLOCK
= 0x80,
768 TRACE_ITER_STACKTRACE
= 0x100,
769 TRACE_ITER_PRINTK
= 0x200,
770 TRACE_ITER_PREEMPTONLY
= 0x400,
771 TRACE_ITER_BRANCH
= 0x800,
772 TRACE_ITER_ANNOTATE
= 0x1000,
773 TRACE_ITER_USERSTACKTRACE
= 0x2000,
774 TRACE_ITER_SYM_USEROBJ
= 0x4000,
775 TRACE_ITER_PRINTK_MSGONLY
= 0x8000,
776 TRACE_ITER_CONTEXT_INFO
= 0x10000, /* Print pid/cpu/time */
777 TRACE_ITER_LATENCY_FMT
= 0x20000,
778 TRACE_ITER_SLEEP_TIME
= 0x40000,
779 TRACE_ITER_GRAPH_TIME
= 0x80000,
780 TRACE_ITER_RECORD_CMD
= 0x100000,
781 TRACE_ITER_OVERWRITE
= 0x200000,
782 TRACE_ITER_STOP_ON_FREE
= 0x400000,
783 TRACE_ITER_IRQ_INFO
= 0x800000,
784 TRACE_ITER_MARKERS
= 0x1000000,
788 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
789 * control the output of kernel symbols.
791 #define TRACE_ITER_SYM_MASK \
792 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
794 extern struct tracer nop_trace
;
796 #ifdef CONFIG_BRANCH_TRACER
797 extern int enable_branch_tracing(struct trace_array
*tr
);
798 extern void disable_branch_tracing(void);
799 static inline int trace_branch_enable(struct trace_array
*tr
)
801 if (trace_flags
& TRACE_ITER_BRANCH
)
802 return enable_branch_tracing(tr
);
805 static inline void trace_branch_disable(void)
807 /* due to races, always disable */
808 disable_branch_tracing();
811 static inline int trace_branch_enable(struct trace_array
*tr
)
815 static inline void trace_branch_disable(void)
818 #endif /* CONFIG_BRANCH_TRACER */
820 /* set ring buffers to default size if not already done so */
821 int tracing_update_buffers(void);
823 /* trace event type bit fields, not numeric */
825 TRACE_EVENT_TYPE_PRINTF
= 1,
826 TRACE_EVENT_TYPE_RAW
= 2,
829 struct ftrace_event_field
{
830 struct list_head link
;
839 struct event_filter
{
840 int n_preds
; /* Number assigned */
841 int a_preds
; /* allocated */
842 struct filter_pred
*preds
;
843 struct filter_pred
*root
;
847 struct event_subsystem
{
848 struct list_head list
;
850 struct dentry
*entry
;
851 struct event_filter
*filter
;
856 #define FILTER_PRED_INVALID ((unsigned short)-1)
857 #define FILTER_PRED_IS_RIGHT (1 << 15)
858 #define FILTER_PRED_FOLD (1 << 15)
861 * The max preds is the size of unsigned short with
862 * two flags at the MSBs. One bit is used for both the IS_RIGHT
863 * and FOLD flags. The other is reserved.
865 * 2^14 preds is way more than enough.
867 #define MAX_FILTER_PRED 16384
872 typedef int (*filter_pred_fn_t
) (struct filter_pred
*pred
, void *event
);
874 typedef int (*regex_match_func
)(char *str
, struct regex
*r
, int len
);
884 char pattern
[MAX_FILTER_STR_VAL
];
887 regex_match_func match
;
895 struct ftrace_event_field
*field
;
899 unsigned short index
;
900 unsigned short parent
;
902 unsigned short right
;
905 extern struct list_head ftrace_common_fields
;
907 extern enum regex_type
908 filter_parse_regex(char *buff
, int len
, char **search
, int *not);
909 extern void print_event_filter(struct ftrace_event_call
*call
,
910 struct trace_seq
*s
);
911 extern int apply_event_filter(struct ftrace_event_call
*call
,
912 char *filter_string
);
913 extern int apply_subsystem_event_filter(struct event_subsystem
*system
,
914 char *filter_string
);
915 extern void print_subsystem_event_filter(struct event_subsystem
*system
,
916 struct trace_seq
*s
);
917 extern int filter_assign_type(const char *type
);
920 trace_get_fields(struct ftrace_event_call
*event_call
);
923 filter_check_discard(struct ftrace_event_call
*call
, void *rec
,
924 struct ring_buffer
*buffer
,
925 struct ring_buffer_event
*event
)
927 if (unlikely(call
->flags
& TRACE_EVENT_FL_FILTERED
) &&
928 !filter_match_preds(call
->filter
, rec
)) {
929 ring_buffer_discard_commit(buffer
, event
);
936 extern void trace_event_enable_cmd_record(bool enable
);
938 extern struct mutex event_mutex
;
939 extern struct list_head ftrace_events
;
941 extern const char *__start___trace_bprintk_fmt
[];
942 extern const char *__stop___trace_bprintk_fmt
[];
944 void trace_printk_init_buffers(void);
945 void trace_printk_start_comm(void);
948 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
949 extern struct ftrace_event_call \
950 __attribute__((__aligned__(4))) event_##call;
951 #undef FTRACE_ENTRY_DUP
952 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
953 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
955 #include "trace_entries.h"
957 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
958 int perf_ftrace_event_register(struct ftrace_event_call
*call
,
959 enum trace_reg type
, void *data
);
961 #define perf_ftrace_event_register NULL
964 #endif /* _LINUX_KERNEL_TRACE_H */