2 #ifndef _LINUX_KERNEL_TRACE_H
3 #define _LINUX_KERNEL_TRACE_H
6 #include <linux/atomic.h>
7 #include <linux/sched.h>
8 #include <linux/clocksource.h>
9 #include <linux/ring_buffer.h>
10 #include <linux/mmiotrace.h>
11 #include <linux/tracepoint.h>
12 #include <linux/ftrace.h>
13 #include <linux/hw_breakpoint.h>
14 #include <linux/trace_seq.h>
15 #include <linux/trace_events.h>
16 #include <linux/compiler.h>
17 #include <linux/trace_seq.h>
19 #ifdef CONFIG_FTRACE_SYSCALLS
20 #include <asm/unistd.h> /* For NR_SYSCALLS */
21 #include <asm/syscall.h> /* some archs define it here */
25 __TRACE_FIRST_TYPE = 0,
47 #define __field(type, item) type item;
50 #define __field_struct(type, item) __field(type, item)
53 #define __field_desc(type, container, item)
56 #define __array(type, item, size) type item[size];
59 #define __array_desc(type, container, item, size)
61 #undef __dynamic_array
62 #define __dynamic_array(type, item) type item[];
65 #define F_STRUCT(args...) args
68 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
69 struct struct_name { \
70 struct trace_entry ent; \
74 #undef FTRACE_ENTRY_DUP
75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
77 #undef FTRACE_ENTRY_REG
78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
83 #include "trace_entries.h"
86 * syscalls are special, and need special handling, this is why
87 * they are not included in trace_entries.h
89 struct syscall_trace_enter {
90 struct trace_entry ent;
95 struct syscall_trace_exit {
96 struct trace_entry ent;
101 struct kprobe_trace_entry_head {
102 struct trace_entry ent;
106 struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
109 unsigned long ret_ip;
113 * trace_flag_type is an enumeration that holds different
114 * states when a trace occurs. These are:
115 * IRQS_OFF - interrupts were disabled
116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
117 * NEED_RESCHED - reschedule is requested
118 * HARDIRQ - inside an interrupt handler
119 * SOFTIRQ - inside a softirq handler
121 enum trace_flag_type {
122 TRACE_FLAG_IRQS_OFF = 0x01,
123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
124 TRACE_FLAG_NEED_RESCHED = 0x04,
125 TRACE_FLAG_HARDIRQ = 0x08,
126 TRACE_FLAG_SOFTIRQ = 0x10,
127 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
128 TRACE_FLAG_NMI = 0x40,
131 #define TRACE_BUF_SIZE 1024
136 * The CPU trace array - it consists of thousands of trace entries
137 * plus some other descriptor data: (for example which task started
140 struct trace_array_cpu {
142 void *buffer_page; /* ring buffer spare */
144 unsigned long entries;
145 unsigned long saved_latency;
146 unsigned long critical_start;
147 unsigned long critical_end;
148 unsigned long critical_sequence;
150 unsigned long policy;
151 unsigned long rt_priority;
152 unsigned long skipped_entries;
153 cycle_t preempt_timestamp;
156 char comm[TASK_COMM_LEN];
162 struct trace_option_dentry;
164 struct trace_buffer {
165 struct trace_array *tr;
166 struct ring_buffer *buffer;
167 struct trace_array_cpu __percpu *data;
172 #define TRACE_FLAGS_MAX_SIZE 32
174 struct trace_options {
175 struct tracer *tracer;
176 struct trace_option_dentry *topts;
179 struct trace_pid_list {
185 * The trace array - an array of per-CPU trace arrays. This is the
186 * highest level data structure that individual tracers deal with.
187 * They have on/off state as well:
190 struct list_head list;
192 struct trace_buffer trace_buffer;
193 #ifdef CONFIG_TRACER_MAX_TRACE
195 * The max_buffer is used to snapshot the trace when a maximum
196 * latency is reached, or when the user initiates a snapshot.
197 * Some tracers will use this to store a maximum trace while
198 * it continues examining live traces.
200 * The buffers for the max_buffer are set up the same as the trace_buffer
201 * When a snapshot is taken, the buffer of the max_buffer is swapped
202 * with the buffer of the trace_buffer and the buffers are reset for
203 * the trace_buffer so the tracing can continue.
205 struct trace_buffer max_buffer;
206 bool allocated_snapshot;
207 unsigned long max_latency;
209 struct trace_pid_list __rcu *filtered_pids;
211 * max_lock is used to protect the swapping of buffers
212 * when taking a max snapshot. The buffers themselves are
213 * protected by per_cpu spinlocks. But the action of the swap
214 * needs its own lock.
216 * This is defined as a arch_spinlock_t in order to help
217 * with performance when lockdep debugging is enabled.
219 * It is also used in other places outside the update_max_tr
220 * so it needs to be defined outside of the
221 * CONFIG_TRACER_MAX_TRACE.
223 arch_spinlock_t max_lock;
225 #ifdef CONFIG_FTRACE_SYSCALLS
226 int sys_refcount_enter;
227 int sys_refcount_exit;
228 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
229 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
234 struct tracer *current_trace;
235 unsigned int trace_flags;
236 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
238 raw_spinlock_t start_lock;
240 struct dentry *options;
241 struct dentry *percpu_dir;
242 struct dentry *event_dir;
243 struct trace_options *topts;
244 struct list_head systems;
245 struct list_head events;
246 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
248 #ifdef CONFIG_FUNCTION_TRACER
249 struct ftrace_ops *ops;
250 /* function tracing enabled */
251 int function_enabled;
256 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
259 extern struct list_head ftrace_trace_arrays;
261 extern struct mutex trace_types_lock;
263 extern int trace_array_get(struct trace_array *tr);
264 extern void trace_array_put(struct trace_array *tr);
267 * The global tracer (top) should be the first trace array added,
268 * but we check the flag anyway.
270 static inline struct trace_array *top_trace_array(void)
272 struct trace_array *tr;
274 if (list_empty(&ftrace_trace_arrays))
277 tr = list_entry(ftrace_trace_arrays.prev,
279 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
283 #define FTRACE_CMP_TYPE(var, type) \
284 __builtin_types_compatible_p(typeof(var), type *)
287 #define IF_ASSIGN(var, entry, etype, id) \
288 if (FTRACE_CMP_TYPE(var, etype)) { \
289 var = (typeof(var))(entry); \
290 WARN_ON(id && (entry)->type != id); \
294 /* Will cause compile errors if type is not found. */
295 extern void __ftrace_bad_type(void);
298 * The trace_assign_type is a verifier that the entry type is
299 * the same as the type being assigned. To add new types simply
300 * add a line with the following format:
302 * IF_ASSIGN(var, ent, type, id);
304 * Where "type" is the trace type that includes the trace_entry
305 * as the "ent" item. And "id" is the trace identifier that is
306 * used in the trace_type enum.
308 * If the type can have more than one id, then use zero.
310 #define trace_assign_type(var, ent) \
312 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
313 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
314 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
315 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
316 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
317 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
318 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
319 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
321 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
323 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
324 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
326 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
328 __ftrace_bad_type(); \
332 * An option specific to a tracer. This is a boolean value.
333 * The bit is the bit index that sets its value on the
334 * flags value in struct tracer_flags.
337 const char *name; /* Will appear on the trace_options file */
338 u32 bit; /* Mask assigned in val field in tracer_flags */
342 * The set of specific options for a tracer. Your tracer
343 * have to set the initial value of the flags val.
345 struct tracer_flags {
347 struct tracer_opt *opts;
348 struct tracer *trace;
351 /* Makes more easy to define a tracer opt */
352 #define TRACER_OPT(s, b) .name = #s, .bit = b
355 struct trace_option_dentry {
356 struct tracer_opt *opt;
357 struct tracer_flags *flags;
358 struct trace_array *tr;
359 struct dentry *entry;
363 * struct tracer - a specific tracer and its callbacks to interact with tracefs
364 * @name: the name chosen to select it on the available_tracers file
365 * @init: called when one switches to this tracer (echo name > current_tracer)
366 * @reset: called when one switches to another tracer
367 * @start: called when tracing is unpaused (echo 1 > tracing_on)
368 * @stop: called when tracing is paused (echo 0 > tracing_on)
369 * @update_thresh: called when tracing_thresh is updated
370 * @open: called when the trace file is opened
371 * @pipe_open: called when the trace_pipe file is opened
372 * @close: called when the trace file is released
373 * @pipe_close: called when the trace_pipe file is released
374 * @read: override the default read callback on trace_pipe
375 * @splice_read: override the default splice_read callback on trace_pipe
376 * @selftest: selftest to run on boot (see trace_selftest.c)
377 * @print_headers: override the first lines that describe your columns
378 * @print_line: callback that prints a trace
379 * @set_flag: signals one of your private flags changed (trace_options file)
380 * @flags: your private flags
384 int (*init)(struct trace_array *tr);
385 void (*reset)(struct trace_array *tr);
386 void (*start)(struct trace_array *tr);
387 void (*stop)(struct trace_array *tr);
388 int (*update_thresh)(struct trace_array *tr);
389 void (*open)(struct trace_iterator *iter);
390 void (*pipe_open)(struct trace_iterator *iter);
391 void (*close)(struct trace_iterator *iter);
392 void (*pipe_close)(struct trace_iterator *iter);
393 ssize_t (*read)(struct trace_iterator *iter,
394 struct file *filp, char __user *ubuf,
395 size_t cnt, loff_t *ppos);
396 ssize_t (*splice_read)(struct trace_iterator *iter,
399 struct pipe_inode_info *pipe,
402 #ifdef CONFIG_FTRACE_STARTUP_TEST
403 int (*selftest)(struct tracer *trace,
404 struct trace_array *tr);
406 void (*print_header)(struct seq_file *m);
407 enum print_line_t (*print_line)(struct trace_iterator *iter);
408 /* If you handled the flag setting, return 0 */
409 int (*set_flag)(struct trace_array *tr,
410 u32 old_flags, u32 bit, int set);
411 /* Return 0 if OK with change, else return non-zero */
412 int (*flag_changed)(struct trace_array *tr,
415 struct tracer_flags *flags;
419 bool allow_instances;
420 #ifdef CONFIG_TRACER_MAX_TRACE
426 /* Only current can touch trace_recursion */
429 * For function tracing recursion:
430 * The order of these bits are important.
432 * When function tracing occurs, the following steps are made:
433 * If arch does not support a ftrace feature:
434 * call internal function (uses INTERNAL bits) which calls...
435 * If callback is registered to the "global" list, the list
436 * function is called and recursion checks the GLOBAL bits.
437 * then this function calls...
438 * The function callback, which can use the FTRACE bits to
439 * check for recursion.
441 * Now if the arch does not suppport a feature, and it calls
442 * the global list function which calls the ftrace callback
443 * all three of these steps will do a recursion protection.
444 * There's no reason to do one if the previous caller already
445 * did. The recursion that we are protecting against will
446 * go through the same steps again.
448 * To prevent the multiple recursion checks, if a recursion
449 * bit is set that is higher than the MAX bit of the current
450 * check, then we know that the check was made by the previous
451 * caller, and we can skip the current check.
455 TRACE_BUFFER_NMI_BIT,
456 TRACE_BUFFER_IRQ_BIT,
457 TRACE_BUFFER_SIRQ_BIT,
459 /* Start of function recursion bits */
461 TRACE_FTRACE_NMI_BIT,
462 TRACE_FTRACE_IRQ_BIT,
463 TRACE_FTRACE_SIRQ_BIT,
465 /* INTERNAL_BITs must be greater than FTRACE_BITs */
467 TRACE_INTERNAL_NMI_BIT,
468 TRACE_INTERNAL_IRQ_BIT,
469 TRACE_INTERNAL_SIRQ_BIT,
473 * Abuse of the trace_recursion.
474 * As we need a way to maintain state if we are tracing the function
475 * graph in irq because we want to trace a particular function that
476 * was called in irq context but we have irq tracing off. Since this
477 * can only be modified by current, we can reuse trace_recursion.
482 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
483 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
484 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
486 #define TRACE_CONTEXT_BITS 4
488 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
489 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
491 #define TRACE_LIST_START TRACE_INTERNAL_BIT
492 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
494 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
496 static __always_inline int trace_get_context_bit(void)
500 if (in_interrupt()) {
514 static __always_inline int trace_test_and_set_recursion(int start, int max)
516 unsigned int val = current->trace_recursion;
519 /* A previous recursion check was made */
520 if ((val & TRACE_CONTEXT_MASK) > max)
523 bit = trace_get_context_bit() + start;
524 if (unlikely(val & (1 << bit)))
528 current->trace_recursion = val;
534 static __always_inline void trace_clear_recursion(int bit)
536 unsigned int val = current->trace_recursion;
545 current->trace_recursion = val;
548 static inline struct ring_buffer_iter *
549 trace_buffer_iter(struct trace_iterator *iter, int cpu)
551 if (iter->buffer_iter && iter->buffer_iter[cpu])
552 return iter->buffer_iter[cpu];
556 int tracer_init(struct tracer *t, struct trace_array *tr);
557 int tracing_is_enabled(void);
558 void tracing_reset(struct trace_buffer *buf, int cpu);
559 void tracing_reset_online_cpus(struct trace_buffer *buf);
560 void tracing_reset_current(int cpu);
561 void tracing_reset_all_online_cpus(void);
562 int tracing_open_generic(struct inode *inode, struct file *filp);
563 bool tracing_is_disabled(void);
564 struct dentry *trace_create_file(const char *name,
566 struct dentry *parent,
568 const struct file_operations *fops);
570 struct dentry *tracing_init_dentry(void);
572 struct ring_buffer_event;
574 struct ring_buffer_event *
575 trace_buffer_lock_reserve(struct ring_buffer *buffer,
581 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
582 struct trace_array_cpu *data);
584 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
585 int *ent_cpu, u64 *ent_ts);
587 void __buffer_unlock_commit(struct ring_buffer *buffer,
588 struct ring_buffer_event *event);
590 int trace_empty(struct trace_iterator *iter);
592 void *trace_find_next_entry_inc(struct trace_iterator *iter);
594 void trace_init_global_iter(struct trace_iterator *iter);
596 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
598 void trace_function(struct trace_array *tr,
600 unsigned long parent_ip,
601 unsigned long flags, int pc);
602 void trace_graph_function(struct trace_array *tr,
604 unsigned long parent_ip,
605 unsigned long flags, int pc);
606 void trace_latency_header(struct seq_file *m);
607 void trace_default_header(struct seq_file *m);
608 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
609 int trace_empty(struct trace_iterator *iter);
611 void trace_graph_return(struct ftrace_graph_ret *trace);
612 int trace_graph_entry(struct ftrace_graph_ent *trace);
613 void set_graph_array(struct trace_array *tr);
615 void tracing_start_cmdline_record(void);
616 void tracing_stop_cmdline_record(void);
617 int register_tracer(struct tracer *type);
618 int is_tracing_stopped(void);
620 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
622 extern cpumask_var_t __read_mostly tracing_buffer_mask;
624 #define for_each_tracing_cpu(cpu) \
625 for_each_cpu(cpu, tracing_buffer_mask)
627 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
629 extern unsigned long tracing_thresh;
635 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
637 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
638 struct task_struct *task);
639 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
640 struct task_struct *self,
641 struct task_struct *task);
642 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
643 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
644 int trace_pid_show(struct seq_file *m, void *v);
645 void trace_free_pid_list(struct trace_pid_list *pid_list);
646 int trace_pid_write(struct trace_pid_list *filtered_pids,
647 struct trace_pid_list **new_pid_list,
648 const char __user *ubuf, size_t cnt);
650 #ifdef CONFIG_TRACER_MAX_TRACE
651 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
652 void update_max_tr_single(struct trace_array *tr,
653 struct task_struct *tsk, int cpu);
654 #endif /* CONFIG_TRACER_MAX_TRACE */
656 #ifdef CONFIG_STACKTRACE
657 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
660 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
663 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
664 unsigned long flags, int pc)
668 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
672 #endif /* CONFIG_STACKTRACE */
674 extern cycle_t ftrace_now(int cpu);
676 extern void trace_find_cmdline(int pid, char comm[]);
677 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
679 #ifdef CONFIG_DYNAMIC_FTRACE
680 extern unsigned long ftrace_update_tot_cnt;
682 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
683 extern int DYN_FTRACE_TEST_NAME(void);
684 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
685 extern int DYN_FTRACE_TEST_NAME2(void);
687 extern bool ring_buffer_expanded;
688 extern bool tracing_selftest_disabled;
690 #ifdef CONFIG_FTRACE_STARTUP_TEST
691 extern int trace_selftest_startup_function(struct tracer *trace,
692 struct trace_array *tr);
693 extern int trace_selftest_startup_function_graph(struct tracer *trace,
694 struct trace_array *tr);
695 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
696 struct trace_array *tr);
697 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
698 struct trace_array *tr);
699 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
700 struct trace_array *tr);
701 extern int trace_selftest_startup_wakeup(struct tracer *trace,
702 struct trace_array *tr);
703 extern int trace_selftest_startup_nop(struct tracer *trace,
704 struct trace_array *tr);
705 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
706 struct trace_array *tr);
707 extern int trace_selftest_startup_branch(struct tracer *trace,
708 struct trace_array *tr);
710 * Tracer data references selftest functions that only occur
711 * on boot up. These can be __init functions. Thus, when selftests
712 * are enabled, then the tracers need to reference __init functions.
714 #define __tracer_data __refdata
716 /* Tracers are seldom changed. Optimize when selftests are disabled. */
717 #define __tracer_data __read_mostly
718 #endif /* CONFIG_FTRACE_STARTUP_TEST */
720 extern void *head_page(struct trace_array_cpu *data);
721 extern unsigned long long ns2usecs(cycle_t nsec);
723 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
725 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
727 trace_array_vprintk(struct trace_array *tr,
728 unsigned long ip, const char *fmt, va_list args);
729 int trace_array_printk(struct trace_array *tr,
730 unsigned long ip, const char *fmt, ...);
731 int trace_array_printk_buf(struct ring_buffer *buffer,
732 unsigned long ip, const char *fmt, ...);
733 void trace_printk_seq(struct trace_seq *s);
734 enum print_line_t print_trace_line(struct trace_iterator *iter);
736 extern char trace_find_mark(unsigned long long duration);
738 /* Standard output formatting function used for function return traces */
739 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
742 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
743 #define TRACE_GRAPH_PRINT_CPU 0x2
744 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
745 #define TRACE_GRAPH_PRINT_PROC 0x8
746 #define TRACE_GRAPH_PRINT_DURATION 0x10
747 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
748 #define TRACE_GRAPH_PRINT_IRQS 0x40
749 #define TRACE_GRAPH_PRINT_TAIL 0x80
750 #define TRACE_GRAPH_SLEEP_TIME 0x100
751 #define TRACE_GRAPH_GRAPH_TIME 0x200
752 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
753 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
755 extern void ftrace_graph_sleep_time_control(bool enable);
756 extern void ftrace_graph_graph_time_control(bool enable);
758 extern enum print_line_t
759 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
760 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
762 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
763 extern void graph_trace_open(struct trace_iterator *iter);
764 extern void graph_trace_close(struct trace_iterator *iter);
765 extern int __trace_graph_entry(struct trace_array *tr,
766 struct ftrace_graph_ent *trace,
767 unsigned long flags, int pc);
768 extern void __trace_graph_return(struct trace_array *tr,
769 struct ftrace_graph_ret *trace,
770 unsigned long flags, int pc);
773 #ifdef CONFIG_DYNAMIC_FTRACE
774 /* TODO: make this variable */
775 #define FTRACE_GRAPH_MAX_FUNCS 32
776 extern int ftrace_graph_count;
777 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
778 extern int ftrace_graph_notrace_count;
779 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
781 static inline int ftrace_graph_addr(unsigned long addr)
785 if (!ftrace_graph_count)
788 for (i = 0; i < ftrace_graph_count; i++) {
789 if (addr == ftrace_graph_funcs[i]) {
791 * If no irqs are to be traced, but a set_graph_function
792 * is set, and called by an interrupt handler, we still
796 trace_recursion_set(TRACE_IRQ_BIT);
798 trace_recursion_clear(TRACE_IRQ_BIT);
806 static inline int ftrace_graph_notrace_addr(unsigned long addr)
810 if (!ftrace_graph_notrace_count)
813 for (i = 0; i < ftrace_graph_notrace_count; i++) {
814 if (addr == ftrace_graph_notrace_funcs[i])
821 static inline int ftrace_graph_addr(unsigned long addr)
826 static inline int ftrace_graph_notrace_addr(unsigned long addr)
830 #endif /* CONFIG_DYNAMIC_FTRACE */
831 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
832 static inline enum print_line_t
833 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
835 return TRACE_TYPE_UNHANDLED;
837 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
839 extern struct list_head ftrace_pids;
841 #ifdef CONFIG_FUNCTION_TRACER
842 extern bool ftrace_filter_param __initdata;
843 static inline int ftrace_trace_task(struct task_struct *task)
845 if (list_empty(&ftrace_pids))
848 return test_tsk_trace_trace(task);
850 extern int ftrace_is_dead(void);
851 int ftrace_create_function_files(struct trace_array *tr,
852 struct dentry *parent);
853 void ftrace_destroy_function_files(struct trace_array *tr);
854 void ftrace_init_global_array_ops(struct trace_array *tr);
855 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
856 void ftrace_reset_array_ops(struct trace_array *tr);
857 int using_ftrace_ops_list_func(void);
859 static inline int ftrace_trace_task(struct task_struct *task)
863 static inline int ftrace_is_dead(void) { return 0; }
865 ftrace_create_function_files(struct trace_array *tr,
866 struct dentry *parent)
870 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
871 static inline __init void
872 ftrace_init_global_array_ops(struct trace_array *tr) { }
873 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
874 /* ftace_func_t type is not defined, use macro instead of static inline */
875 #define ftrace_init_array_ops(tr, func) do { } while (0)
876 #endif /* CONFIG_FUNCTION_TRACER */
878 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
879 void ftrace_create_filter_files(struct ftrace_ops *ops,
880 struct dentry *parent);
881 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
884 * The ops parameter passed in is usually undefined.
885 * This must be a macro.
887 #define ftrace_create_filter_files(ops, parent) do { } while (0)
888 #define ftrace_destroy_filter_files(ops) do { } while (0)
889 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
891 bool ftrace_event_is_function(struct trace_event_call *call);
894 * struct trace_parser - servers for reading the user input separated by spaces
895 * @cont: set if the input is not complete - no final space char was found
896 * @buffer: holds the parsed user input
897 * @idx: user input length
900 struct trace_parser {
907 static inline bool trace_parser_loaded(struct trace_parser *parser)
909 return (parser->idx != 0);
912 static inline bool trace_parser_cont(struct trace_parser *parser)
917 static inline void trace_parser_clear(struct trace_parser *parser)
919 parser->cont = false;
923 extern int trace_parser_get_init(struct trace_parser *parser, int size);
924 extern void trace_parser_put(struct trace_parser *parser);
925 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
926 size_t cnt, loff_t *ppos);
929 * Only create function graph options if function graph is configured.
931 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
932 # define FGRAPH_FLAGS \
933 C(DISPLAY_GRAPH, "display-graph"),
935 # define FGRAPH_FLAGS
938 #ifdef CONFIG_BRANCH_TRACER
939 # define BRANCH_FLAGS \
942 # define BRANCH_FLAGS
945 #ifdef CONFIG_FUNCTION_TRACER
946 # define FUNCTION_FLAGS \
947 C(FUNCTION, "function-trace"),
948 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
950 # define FUNCTION_FLAGS
951 # define FUNCTION_DEFAULT_FLAGS 0UL
954 #ifdef CONFIG_STACKTRACE
955 # define STACK_FLAGS \
956 C(STACKTRACE, "stacktrace"),
962 * trace_iterator_flags is an enumeration that defines bit
963 * positions into trace_flags that controls the output.
965 * NOTE: These bits must match the trace_options array in
966 * trace.c (this macro guarantees it).
968 #define TRACE_FLAGS \
969 C(PRINT_PARENT, "print-parent"), \
970 C(SYM_OFFSET, "sym-offset"), \
971 C(SYM_ADDR, "sym-addr"), \
972 C(VERBOSE, "verbose"), \
977 C(PRINTK, "trace_printk"), \
978 C(ANNOTATE, "annotate"), \
979 C(USERSTACKTRACE, "userstacktrace"), \
980 C(SYM_USEROBJ, "sym-userobj"), \
981 C(PRINTK_MSGONLY, "printk-msg-only"), \
982 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
983 C(LATENCY_FMT, "latency-format"), \
984 C(RECORD_CMD, "record-cmd"), \
985 C(OVERWRITE, "overwrite"), \
986 C(STOP_ON_FREE, "disable_on_free"), \
987 C(IRQ_INFO, "irq-info"), \
988 C(MARKERS, "markers"), \
989 C(EVENT_FORK, "event-fork"), \
996 * By defining C, we can make TRACE_FLAGS a list of bit names
997 * that will define the bits for the flag masks.
1000 #define C(a, b) TRACE_ITER_##a##_BIT
1002 enum trace_iterator_bits {
1004 /* Make sure we don't go more than we have bits for */
1009 * By redefining C, we can make TRACE_FLAGS a list of masks that
1010 * use the bits as defined above.
1013 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1015 enum trace_iterator_flags { TRACE_FLAGS };
1018 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1019 * control the output of kernel symbols.
1021 #define TRACE_ITER_SYM_MASK \
1022 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1024 extern struct tracer nop_trace;
1026 #ifdef CONFIG_BRANCH_TRACER
1027 extern int enable_branch_tracing(struct trace_array *tr);
1028 extern void disable_branch_tracing(void);
1029 static inline int trace_branch_enable(struct trace_array *tr)
1031 if (tr->trace_flags & TRACE_ITER_BRANCH)
1032 return enable_branch_tracing(tr);
1035 static inline void trace_branch_disable(void)
1037 /* due to races, always disable */
1038 disable_branch_tracing();
1041 static inline int trace_branch_enable(struct trace_array *tr)
1045 static inline void trace_branch_disable(void)
1048 #endif /* CONFIG_BRANCH_TRACER */
1050 /* set ring buffers to default size if not already done so */
1051 int tracing_update_buffers(void);
1053 struct ftrace_event_field {
1054 struct list_head link;
1063 struct event_filter {
1064 int n_preds; /* Number assigned */
1065 int a_preds; /* allocated */
1066 struct filter_pred *preds;
1067 struct filter_pred *root;
1068 char *filter_string;
1071 struct event_subsystem {
1072 struct list_head list;
1074 struct event_filter *filter;
1078 struct trace_subsystem_dir {
1079 struct list_head list;
1080 struct event_subsystem *subsystem;
1081 struct trace_array *tr;
1082 struct dentry *entry;
1087 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1088 struct ring_buffer *buffer,
1089 struct ring_buffer_event *event);
1091 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1092 struct ring_buffer *buffer,
1093 struct ring_buffer_event *event,
1094 unsigned long flags, int pc,
1095 struct pt_regs *regs);
1097 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1098 struct ring_buffer *buffer,
1099 struct ring_buffer_event *event,
1100 unsigned long flags, int pc)
1102 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1105 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1106 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1107 void trace_buffered_event_disable(void);
1108 void trace_buffered_event_enable(void);
1111 __trace_event_discard_commit(struct ring_buffer *buffer,
1112 struct ring_buffer_event *event)
1114 if (this_cpu_read(trace_buffered_event) == event) {
1115 /* Simply release the temp buffer */
1116 this_cpu_dec(trace_buffered_event_cnt);
1119 ring_buffer_discard_commit(buffer, event);
1123 * Helper function for event_trigger_unlock_commit{_regs}().
1124 * If there are event triggers attached to this event that requires
1125 * filtering against its fields, then they wil be called as the
1126 * entry already holds the field information of the current event.
1128 * It also checks if the event should be discarded or not.
1129 * It is to be discarded if the event is soft disabled and the
1130 * event was only recorded to process triggers, or if the event
1131 * filter is active and this event did not match the filters.
1133 * Returns true if the event is discarded, false otherwise.
1136 __event_trigger_test_discard(struct trace_event_file *file,
1137 struct ring_buffer *buffer,
1138 struct ring_buffer_event *event,
1140 enum event_trigger_type *tt)
1142 unsigned long eflags = file->flags;
1144 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1145 *tt = event_triggers_call(file, entry);
1147 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1148 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1149 !filter_match_preds(file->filter, entry))) {
1150 __trace_event_discard_commit(buffer, event);
1158 * event_trigger_unlock_commit - handle triggers and finish event commit
1159 * @file: The file pointer assoctiated to the event
1160 * @buffer: The ring buffer that the event is being written to
1161 * @event: The event meta data in the ring buffer
1162 * @entry: The event itself
1163 * @irq_flags: The state of the interrupts at the start of the event
1164 * @pc: The state of the preempt count at the start of the event.
1166 * This is a helper function to handle triggers that require data
1167 * from the event itself. It also tests the event against filters and
1168 * if the event is soft disabled and should be discarded.
1171 event_trigger_unlock_commit(struct trace_event_file *file,
1172 struct ring_buffer *buffer,
1173 struct ring_buffer_event *event,
1174 void *entry, unsigned long irq_flags, int pc)
1176 enum event_trigger_type tt = ETT_NONE;
1178 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1179 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1182 event_triggers_post_call(file, tt, entry);
1186 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1187 * @file: The file pointer assoctiated to the event
1188 * @buffer: The ring buffer that the event is being written to
1189 * @event: The event meta data in the ring buffer
1190 * @entry: The event itself
1191 * @irq_flags: The state of the interrupts at the start of the event
1192 * @pc: The state of the preempt count at the start of the event.
1194 * This is a helper function to handle triggers that require data
1195 * from the event itself. It also tests the event against filters and
1196 * if the event is soft disabled and should be discarded.
1198 * Same as event_trigger_unlock_commit() but calls
1199 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1202 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1203 struct ring_buffer *buffer,
1204 struct ring_buffer_event *event,
1205 void *entry, unsigned long irq_flags, int pc,
1206 struct pt_regs *regs)
1208 enum event_trigger_type tt = ETT_NONE;
1210 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1211 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1212 irq_flags, pc, regs);
1215 event_triggers_post_call(file, tt, entry);
1218 #define FILTER_PRED_INVALID ((unsigned short)-1)
1219 #define FILTER_PRED_IS_RIGHT (1 << 15)
1220 #define FILTER_PRED_FOLD (1 << 15)
1223 * The max preds is the size of unsigned short with
1224 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1225 * and FOLD flags. The other is reserved.
1227 * 2^14 preds is way more than enough.
1229 #define MAX_FILTER_PRED 16384
1234 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1236 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1246 char pattern[MAX_FILTER_STR_VAL];
1249 regex_match_func match;
1252 struct filter_pred {
1253 filter_pred_fn_t fn;
1256 unsigned short *ops;
1257 struct ftrace_event_field *field;
1261 unsigned short index;
1262 unsigned short parent;
1263 unsigned short left;
1264 unsigned short right;
1267 static inline bool is_string_field(struct ftrace_event_field *field)
1269 return field->filter_type == FILTER_DYN_STRING ||
1270 field->filter_type == FILTER_STATIC_STRING ||
1271 field->filter_type == FILTER_PTR_STRING;
1274 static inline bool is_function_field(struct ftrace_event_field *field)
1276 return field->filter_type == FILTER_TRACE_FN;
1279 extern enum regex_type
1280 filter_parse_regex(char *buff, int len, char **search, int *not);
1281 extern void print_event_filter(struct trace_event_file *file,
1282 struct trace_seq *s);
1283 extern int apply_event_filter(struct trace_event_file *file,
1284 char *filter_string);
1285 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1286 char *filter_string);
1287 extern void print_subsystem_event_filter(struct event_subsystem *system,
1288 struct trace_seq *s);
1289 extern int filter_assign_type(const char *type);
1290 extern int create_event_filter(struct trace_event_call *call,
1291 char *filter_str, bool set_str,
1292 struct event_filter **filterp);
1293 extern void free_event_filter(struct event_filter *filter);
1295 struct ftrace_event_field *
1296 trace_find_event_field(struct trace_event_call *call, char *name);
1298 extern void trace_event_enable_cmd_record(bool enable);
1299 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1300 extern int event_trace_del_tracer(struct trace_array *tr);
1302 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1306 static inline void *event_file_data(struct file *filp)
1308 return ACCESS_ONCE(file_inode(filp)->i_private);
1311 extern struct mutex event_mutex;
1312 extern struct list_head ftrace_events;
1314 extern const struct file_operations event_trigger_fops;
1315 extern const struct file_operations event_hist_fops;
1317 #ifdef CONFIG_HIST_TRIGGERS
1318 extern int register_trigger_hist_cmd(void);
1319 extern int register_trigger_hist_enable_disable_cmds(void);
1321 static inline int register_trigger_hist_cmd(void) { return 0; }
1322 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1325 extern int register_trigger_cmds(void);
1326 extern void clear_event_triggers(struct trace_array *tr);
1328 struct event_trigger_data {
1329 unsigned long count;
1331 struct event_trigger_ops *ops;
1332 struct event_command *cmd_ops;
1333 struct event_filter __rcu *filter;
1338 struct list_head list;
1340 struct list_head named_list;
1341 struct event_trigger_data *named_data;
1345 #define ENABLE_EVENT_STR "enable_event"
1346 #define DISABLE_EVENT_STR "disable_event"
1347 #define ENABLE_HIST_STR "enable_hist"
1348 #define DISABLE_HIST_STR "disable_hist"
1350 struct enable_trigger_data {
1351 struct trace_event_file *file;
1356 extern int event_enable_trigger_print(struct seq_file *m,
1357 struct event_trigger_ops *ops,
1358 struct event_trigger_data *data);
1359 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1360 struct event_trigger_data *data);
1361 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1362 struct trace_event_file *file,
1363 char *glob, char *cmd, char *param);
1364 extern int event_enable_register_trigger(char *glob,
1365 struct event_trigger_ops *ops,
1366 struct event_trigger_data *data,
1367 struct trace_event_file *file);
1368 extern void event_enable_unregister_trigger(char *glob,
1369 struct event_trigger_ops *ops,
1370 struct event_trigger_data *test,
1371 struct trace_event_file *file);
1372 extern void trigger_data_free(struct event_trigger_data *data);
1373 extern int event_trigger_init(struct event_trigger_ops *ops,
1374 struct event_trigger_data *data);
1375 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1376 int trigger_enable);
1377 extern void update_cond_flag(struct trace_event_file *file);
1378 extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1379 struct event_trigger_data *test,
1380 struct trace_event_file *file);
1381 extern int set_trigger_filter(char *filter_str,
1382 struct event_trigger_data *trigger_data,
1383 struct trace_event_file *file);
1384 extern struct event_trigger_data *find_named_trigger(const char *name);
1385 extern bool is_named_trigger(struct event_trigger_data *test);
1386 extern int save_named_trigger(const char *name,
1387 struct event_trigger_data *data);
1388 extern void del_named_trigger(struct event_trigger_data *data);
1389 extern void pause_named_trigger(struct event_trigger_data *data);
1390 extern void unpause_named_trigger(struct event_trigger_data *data);
1391 extern void set_named_trigger_data(struct event_trigger_data *data,
1392 struct event_trigger_data *named_data);
1393 extern int register_event_command(struct event_command *cmd);
1394 extern int unregister_event_command(struct event_command *cmd);
1395 extern int register_trigger_hist_enable_disable_cmds(void);
1398 * struct event_trigger_ops - callbacks for trace event triggers
1400 * The methods in this structure provide per-event trigger hooks for
1401 * various trigger operations.
1403 * All the methods below, except for @init() and @free(), must be
1406 * @func: The trigger 'probe' function called when the triggering
1407 * event occurs. The data passed into this callback is the data
1408 * that was supplied to the event_command @reg() function that
1409 * registered the trigger (see struct event_command) along with
1410 * the trace record, rec.
1412 * @init: An optional initialization function called for the trigger
1413 * when the trigger is registered (via the event_command reg()
1414 * function). This can be used to perform per-trigger
1415 * initialization such as incrementing a per-trigger reference
1416 * count, for instance. This is usually implemented by the
1417 * generic utility function @event_trigger_init() (see
1418 * trace_event_triggers.c).
1420 * @free: An optional de-initialization function called for the
1421 * trigger when the trigger is unregistered (via the
1422 * event_command @reg() function). This can be used to perform
1423 * per-trigger de-initialization such as decrementing a
1424 * per-trigger reference count and freeing corresponding trigger
1425 * data, for instance. This is usually implemented by the
1426 * generic utility function @event_trigger_free() (see
1427 * trace_event_triggers.c).
1429 * @print: The callback function invoked to have the trigger print
1430 * itself. This is usually implemented by a wrapper function
1431 * that calls the generic utility function @event_trigger_print()
1432 * (see trace_event_triggers.c).
1434 struct event_trigger_ops {
1435 void (*func)(struct event_trigger_data *data,
1437 int (*init)(struct event_trigger_ops *ops,
1438 struct event_trigger_data *data);
1439 void (*free)(struct event_trigger_ops *ops,
1440 struct event_trigger_data *data);
1441 int (*print)(struct seq_file *m,
1442 struct event_trigger_ops *ops,
1443 struct event_trigger_data *data);
1447 * struct event_command - callbacks and data members for event commands
1449 * Event commands are invoked by users by writing the command name
1450 * into the 'trigger' file associated with a trace event. The
1451 * parameters associated with a specific invocation of an event
1452 * command are used to create an event trigger instance, which is
1453 * added to the list of trigger instances associated with that trace
1454 * event. When the event is hit, the set of triggers associated with
1455 * that event is invoked.
1457 * The data members in this structure provide per-event command data
1458 * for various event commands.
1460 * All the data members below, except for @post_trigger, must be set
1461 * for each event command.
1463 * @name: The unique name that identifies the event command. This is
1464 * the name used when setting triggers via trigger files.
1466 * @trigger_type: A unique id that identifies the event command
1467 * 'type'. This value has two purposes, the first to ensure that
1468 * only one trigger of the same type can be set at a given time
1469 * for a particular event e.g. it doesn't make sense to have both
1470 * a traceon and traceoff trigger attached to a single event at
1471 * the same time, so traceon and traceoff have the same type
1472 * though they have different names. The @trigger_type value is
1473 * also used as a bit value for deferring the actual trigger
1474 * action until after the current event is finished. Some
1475 * commands need to do this if they themselves log to the trace
1476 * buffer (see the @post_trigger() member below). @trigger_type
1477 * values are defined by adding new values to the trigger_type
1478 * enum in include/linux/trace_events.h.
1480 * @flags: See the enum event_command_flags below.
1482 * All the methods below, except for @set_filter() and @unreg_all(),
1483 * must be implemented.
1485 * @func: The callback function responsible for parsing and
1486 * registering the trigger written to the 'trigger' file by the
1487 * user. It allocates the trigger instance and registers it with
1488 * the appropriate trace event. It makes use of the other
1489 * event_command callback functions to orchestrate this, and is
1490 * usually implemented by the generic utility function
1491 * @event_trigger_callback() (see trace_event_triggers.c).
1493 * @reg: Adds the trigger to the list of triggers associated with the
1494 * event, and enables the event trigger itself, after
1495 * initializing it (via the event_trigger_ops @init() function).
1496 * This is also where commands can use the @trigger_type value to
1497 * make the decision as to whether or not multiple instances of
1498 * the trigger should be allowed. This is usually implemented by
1499 * the generic utility function @register_trigger() (see
1500 * trace_event_triggers.c).
1502 * @unreg: Removes the trigger from the list of triggers associated
1503 * with the event, and disables the event trigger itself, after
1504 * initializing it (via the event_trigger_ops @free() function).
1505 * This is usually implemented by the generic utility function
1506 * @unregister_trigger() (see trace_event_triggers.c).
1508 * @unreg_all: An optional function called to remove all the triggers
1509 * from the list of triggers associated with the event. Called
1510 * when a trigger file is opened in truncate mode.
1512 * @set_filter: An optional function called to parse and set a filter
1513 * for the trigger. If no @set_filter() method is set for the
1514 * event command, filters set by the user for the command will be
1515 * ignored. This is usually implemented by the generic utility
1516 * function @set_trigger_filter() (see trace_event_triggers.c).
1518 * @get_trigger_ops: The callback function invoked to retrieve the
1519 * event_trigger_ops implementation associated with the command.
1521 struct event_command {
1522 struct list_head list;
1524 enum event_trigger_type trigger_type;
1526 int (*func)(struct event_command *cmd_ops,
1527 struct trace_event_file *file,
1528 char *glob, char *cmd, char *params);
1529 int (*reg)(char *glob,
1530 struct event_trigger_ops *ops,
1531 struct event_trigger_data *data,
1532 struct trace_event_file *file);
1533 void (*unreg)(char *glob,
1534 struct event_trigger_ops *ops,
1535 struct event_trigger_data *data,
1536 struct trace_event_file *file);
1537 void (*unreg_all)(struct trace_event_file *file);
1538 int (*set_filter)(char *filter_str,
1539 struct event_trigger_data *data,
1540 struct trace_event_file *file);
1541 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1545 * enum event_command_flags - flags for struct event_command
1547 * @POST_TRIGGER: A flag that says whether or not this command needs
1548 * to have its action delayed until after the current event has
1549 * been closed. Some triggers need to avoid being invoked while
1550 * an event is currently in the process of being logged, since
1551 * the trigger may itself log data into the trace buffer. Thus
1552 * we make sure the current event is committed before invoking
1553 * those triggers. To do that, the trigger invocation is split
1554 * in two - the first part checks the filter using the current
1555 * trace record; if a command has the @post_trigger flag set, it
1556 * sets a bit for itself in the return value, otherwise it
1557 * directly invokes the trigger. Once all commands have been
1558 * either invoked or set their return flag, the current record is
1559 * either committed or discarded. At that point, if any commands
1560 * have deferred their triggers, those commands are finally
1561 * invoked following the close of the current event. In other
1562 * words, if the event_trigger_ops @func() probe implementation
1563 * itself logs to the trace buffer, this flag should be set,
1564 * otherwise it can be left unspecified.
1566 * @NEEDS_REC: A flag that says whether or not this command needs
1567 * access to the trace record in order to perform its function,
1568 * regardless of whether or not it has a filter associated with
1569 * it (filters make a trigger require access to the trace record
1570 * but are not always present).
1572 enum event_command_flags {
1573 EVENT_CMD_FL_POST_TRIGGER = 1,
1574 EVENT_CMD_FL_NEEDS_REC = 2,
1577 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1579 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1582 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1584 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1587 extern int trace_event_enable_disable(struct trace_event_file *file,
1588 int enable, int soft_disable);
1589 extern int tracing_alloc_snapshot(void);
1591 extern const char *__start___trace_bprintk_fmt[];
1592 extern const char *__stop___trace_bprintk_fmt[];
1594 extern const char *__start___tracepoint_str[];
1595 extern const char *__stop___tracepoint_str[];
1597 void trace_printk_control(bool enabled);
1598 void trace_printk_init_buffers(void);
1599 void trace_printk_start_comm(void);
1600 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1601 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1604 * Normal trace_printk() and friends allocates special buffers
1605 * to do the manipulation, as well as saves the print formats
1606 * into sections to display. But the trace infrastructure wants
1607 * to use these without the added overhead at the price of being
1608 * a bit slower (used mainly for warnings, where we don't care
1609 * about performance). The internal_trace_puts() is for such
1612 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1615 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1616 extern struct trace_event_call \
1617 __aligned(4) event_##call;
1618 #undef FTRACE_ENTRY_DUP
1619 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1620 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1622 #include "trace_entries.h"
1624 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1625 int perf_ftrace_event_register(struct trace_event_call *call,
1626 enum trace_reg type, void *data);
1628 #define perf_ftrace_event_register NULL
1631 #ifdef CONFIG_FTRACE_SYSCALLS
1632 void init_ftrace_syscalls(void);
1633 const char *get_syscall_name(int syscall);
1635 static inline void init_ftrace_syscalls(void) { }
1636 static inline const char *get_syscall_name(int syscall)
1642 #ifdef CONFIG_EVENT_TRACING
1643 void trace_event_init(void);
1644 void trace_event_enum_update(struct trace_enum_map **map, int len);
1646 static inline void __init trace_event_init(void) { }
1647 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1650 extern struct trace_iterator *tracepoint_print_iter;
1652 #endif /* _LINUX_KERNEL_TRACE_H */