1 // SPDX-License-Identifier: GPL-2.0
3 #ifndef _LINUX_KERNEL_TRACE_H
4 #define _LINUX_KERNEL_TRACE_H
7 #include <linux/atomic.h>
8 #include <linux/sched.h>
9 #include <linux/clocksource.h>
10 #include <linux/ring_buffer.h>
11 #include <linux/mmiotrace.h>
12 #include <linux/tracepoint.h>
13 #include <linux/ftrace.h>
14 #include <linux/trace.h>
15 #include <linux/hw_breakpoint.h>
16 #include <linux/trace_seq.h>
17 #include <linux/trace_events.h>
18 #include <linux/compiler.h>
19 #include <linux/glob.h>
20 #include <linux/irq_work.h>
21 #include <linux/workqueue.h>
22 #include <linux/ctype.h>
23 #include <linux/once_lite.h>
27 #ifdef CONFIG_FTRACE_SYSCALLS
28 #include <asm/unistd.h> /* For NR_syscalls */
29 #include <asm/syscall.h> /* some archs define it here */
32 #define TRACE_MODE_WRITE 0640
33 #define TRACE_MODE_READ 0440
36 __TRACE_FIRST_TYPE = 0,
63 #define __field(type, item) type item;
66 #define __field_fn(type, item) type item;
69 #define __field_struct(type, item) __field(type, item)
72 #define __field_desc(type, container, item)
75 #define __field_packed(type, container, item)
78 #define __array(type, item, size) type item[size];
81 #define __array_desc(type, container, item, size)
83 #undef __dynamic_array
84 #define __dynamic_array(type, item) type item[];
86 #undef __rel_dynamic_array
87 #define __rel_dynamic_array(type, item) type item[];
90 #define F_STRUCT(args...) args
93 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
94 struct struct_name { \
95 struct trace_entry ent; \
99 #undef FTRACE_ENTRY_DUP
100 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
102 #undef FTRACE_ENTRY_REG
103 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
104 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
106 #undef FTRACE_ENTRY_PACKED
107 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
108 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
110 #include "trace_entries.h"
112 /* Use this for memory failure errors */
113 #define MEM_FAIL(condition, fmt, ...) \
114 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__)
116 #define HIST_STACKTRACE_DEPTH 16
117 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
118 #define HIST_STACKTRACE_SKIP 5
121 * syscalls are special, and need special handling, this is why
122 * they are not included in trace_entries.h
124 struct syscall_trace_enter {
125 struct trace_entry ent;
127 unsigned long args[];
130 struct syscall_trace_exit {
131 struct trace_entry ent;
136 struct kprobe_trace_entry_head {
137 struct trace_entry ent;
141 struct eprobe_trace_entry_head {
142 struct trace_entry ent;
145 struct kretprobe_trace_entry_head {
146 struct trace_entry ent;
148 unsigned long ret_ip;
151 #define TRACE_BUF_SIZE 1024
156 * The CPU trace array - it consists of thousands of trace entries
157 * plus some other descriptor data: (for example which task started
160 struct trace_array_cpu {
162 void *buffer_page; /* ring buffer spare */
164 unsigned long entries;
165 unsigned long saved_latency;
166 unsigned long critical_start;
167 unsigned long critical_end;
168 unsigned long critical_sequence;
170 unsigned long policy;
171 unsigned long rt_priority;
172 unsigned long skipped_entries;
173 u64 preempt_timestamp;
176 char comm[TASK_COMM_LEN];
178 #ifdef CONFIG_FUNCTION_TRACER
179 int ftrace_ignore_pid;
185 struct trace_option_dentry;
187 struct array_buffer {
188 struct trace_array *tr;
189 struct trace_buffer *buffer;
190 struct trace_array_cpu __percpu *data;
195 #define TRACE_FLAGS_MAX_SIZE 32
197 struct trace_options {
198 struct tracer *tracer;
199 struct trace_option_dentry *topts;
202 struct trace_pid_list *trace_pid_list_alloc(void);
203 void trace_pid_list_free(struct trace_pid_list *pid_list);
204 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
205 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
206 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
207 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid);
208 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
213 TRACE_NO_PIDS = BIT(1),
216 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
217 struct trace_pid_list *no_pid_list)
219 /* Return true if the pid list in type has pids */
220 return ((type & TRACE_PIDS) && pid_list) ||
221 ((type & TRACE_NO_PIDS) && no_pid_list);
224 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
225 struct trace_pid_list *no_pid_list)
228 * Turning off what is in @type, return true if the "other"
229 * pid list, still has pids in it.
231 return (!(type & TRACE_PIDS) && pid_list) ||
232 (!(type & TRACE_NO_PIDS) && no_pid_list);
235 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
238 * struct cond_snapshot - conditional snapshot data and callback
240 * The cond_snapshot structure encapsulates a callback function and
241 * data associated with the snapshot for a given tracing instance.
243 * When a snapshot is taken conditionally, by invoking
244 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
245 * passed in turn to the cond_snapshot.update() function. That data
246 * can be compared by the update() implementation with the cond_data
247 * contained within the struct cond_snapshot instance associated with
248 * the trace_array. Because the tr->max_lock is held throughout the
249 * update() call, the update() function can directly retrieve the
250 * cond_snapshot and cond_data associated with the per-instance
251 * snapshot associated with the trace_array.
253 * The cond_snapshot.update() implementation can save data to be
254 * associated with the snapshot if it decides to, and returns 'true'
255 * in that case, or it returns 'false' if the conditional snapshot
256 * shouldn't be taken.
258 * The cond_snapshot instance is created and associated with the
259 * user-defined cond_data by tracing_cond_snapshot_enable().
260 * Likewise, the cond_snapshot instance is destroyed and is no longer
261 * associated with the trace instance by
262 * tracing_cond_snapshot_disable().
264 * The method below is required.
266 * @update: When a conditional snapshot is invoked, the update()
267 * callback function is invoked with the tr->max_lock held. The
268 * update() implementation signals whether or not to actually
269 * take the snapshot, by returning 'true' if so, 'false' if no
270 * snapshot should be taken. Because the max_lock is held for
271 * the duration of update(), the implementation is safe to
272 * directly retrieved and save any implementation data it needs
273 * to in association with the snapshot.
275 struct cond_snapshot {
277 cond_update_fn_t update;
281 * struct trace_func_repeats - used to keep track of the consecutive
282 * (on the same CPU) calls of a single function.
284 struct trace_func_repeats {
286 unsigned long parent_ip;
292 * The trace array - an array of per-CPU trace arrays. This is the
293 * highest level data structure that individual tracers deal with.
294 * They have on/off state as well:
297 struct list_head list;
299 struct array_buffer array_buffer;
300 #ifdef CONFIG_TRACER_MAX_TRACE
302 * The max_buffer is used to snapshot the trace when a maximum
303 * latency is reached, or when the user initiates a snapshot.
304 * Some tracers will use this to store a maximum trace while
305 * it continues examining live traces.
307 * The buffers for the max_buffer are set up the same as the array_buffer
308 * When a snapshot is taken, the buffer of the max_buffer is swapped
309 * with the buffer of the array_buffer and the buffers are reset for
310 * the array_buffer so the tracing can continue.
312 struct array_buffer max_buffer;
313 bool allocated_snapshot;
315 #ifdef CONFIG_TRACER_MAX_TRACE
316 unsigned long max_latency;
317 #ifdef CONFIG_FSNOTIFY
318 struct dentry *d_max_latency;
319 struct work_struct fsnotify_work;
320 struct irq_work fsnotify_irqwork;
323 struct trace_pid_list __rcu *filtered_pids;
324 struct trace_pid_list __rcu *filtered_no_pids;
326 * max_lock is used to protect the swapping of buffers
327 * when taking a max snapshot. The buffers themselves are
328 * protected by per_cpu spinlocks. But the action of the swap
329 * needs its own lock.
331 * This is defined as a arch_spinlock_t in order to help
332 * with performance when lockdep debugging is enabled.
334 * It is also used in other places outside the update_max_tr
335 * so it needs to be defined outside of the
336 * CONFIG_TRACER_MAX_TRACE.
338 arch_spinlock_t max_lock;
340 #ifdef CONFIG_FTRACE_SYSCALLS
341 int sys_refcount_enter;
342 int sys_refcount_exit;
343 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
344 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
351 unsigned int n_err_log_entries;
352 struct tracer *current_trace;
353 unsigned int trace_flags;
354 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
356 raw_spinlock_t start_lock;
357 struct list_head err_log;
359 struct dentry *options;
360 struct dentry *percpu_dir;
361 struct dentry *event_dir;
362 struct trace_options *topts;
363 struct list_head systems;
364 struct list_head events;
365 struct trace_event_file *trace_marker_file;
366 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
369 #ifdef CONFIG_FUNCTION_TRACER
370 struct ftrace_ops *ops;
371 struct trace_pid_list __rcu *function_pids;
372 struct trace_pid_list __rcu *function_no_pids;
373 #ifdef CONFIG_DYNAMIC_FTRACE
374 /* All of these are protected by the ftrace_lock */
375 struct list_head func_probes;
376 struct list_head mod_trace;
377 struct list_head mod_notrace;
379 /* function tracing enabled */
380 int function_enabled;
382 int no_filter_buffering_ref;
383 struct list_head hist_vars;
384 #ifdef CONFIG_TRACER_SNAPSHOT
385 struct cond_snapshot *cond_snapshot;
387 struct trace_func_repeats __percpu *last_func_repeats;
391 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
394 extern struct list_head ftrace_trace_arrays;
396 extern struct mutex trace_types_lock;
398 extern int trace_array_get(struct trace_array *tr);
399 extern int tracing_check_open_get_tr(struct trace_array *tr);
400 extern struct trace_array *trace_array_find(const char *instance);
401 extern struct trace_array *trace_array_find_get(const char *instance);
403 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
404 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
405 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
407 extern bool trace_clock_in_ns(struct trace_array *tr);
410 * The global tracer (top) should be the first trace array added,
411 * but we check the flag anyway.
413 static inline struct trace_array *top_trace_array(void)
415 struct trace_array *tr;
417 if (list_empty(&ftrace_trace_arrays))
420 tr = list_entry(ftrace_trace_arrays.prev,
422 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
426 #define FTRACE_CMP_TYPE(var, type) \
427 __builtin_types_compatible_p(typeof(var), type *)
430 #define IF_ASSIGN(var, entry, etype, id) \
431 if (FTRACE_CMP_TYPE(var, etype)) { \
432 var = (typeof(var))(entry); \
433 WARN_ON(id != 0 && (entry)->type != id); \
437 /* Will cause compile errors if type is not found. */
438 extern void __ftrace_bad_type(void);
441 * The trace_assign_type is a verifier that the entry type is
442 * the same as the type being assigned. To add new types simply
443 * add a line with the following format:
445 * IF_ASSIGN(var, ent, type, id);
447 * Where "type" is the trace type that includes the trace_entry
448 * as the "ent" item. And "id" is the trace identifier that is
449 * used in the trace_type enum.
451 * If the type can have more than one id, then use zero.
453 #define trace_assign_type(var, ent) \
455 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
456 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
457 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
458 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
459 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
460 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
461 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
462 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
463 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
464 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
465 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
466 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
468 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
470 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
471 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
473 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
475 IF_ASSIGN(var, ent, struct func_repeats_entry, \
476 TRACE_FUNC_REPEATS); \
477 __ftrace_bad_type(); \
481 * An option specific to a tracer. This is a boolean value.
482 * The bit is the bit index that sets its value on the
483 * flags value in struct tracer_flags.
486 const char *name; /* Will appear on the trace_options file */
487 u32 bit; /* Mask assigned in val field in tracer_flags */
491 * The set of specific options for a tracer. Your tracer
492 * have to set the initial value of the flags val.
494 struct tracer_flags {
496 struct tracer_opt *opts;
497 struct tracer *trace;
500 /* Makes more easy to define a tracer opt */
501 #define TRACER_OPT(s, b) .name = #s, .bit = b
504 struct trace_option_dentry {
505 struct tracer_opt *opt;
506 struct tracer_flags *flags;
507 struct trace_array *tr;
508 struct dentry *entry;
512 * struct tracer - a specific tracer and its callbacks to interact with tracefs
513 * @name: the name chosen to select it on the available_tracers file
514 * @init: called when one switches to this tracer (echo name > current_tracer)
515 * @reset: called when one switches to another tracer
516 * @start: called when tracing is unpaused (echo 1 > tracing_on)
517 * @stop: called when tracing is paused (echo 0 > tracing_on)
518 * @update_thresh: called when tracing_thresh is updated
519 * @open: called when the trace file is opened
520 * @pipe_open: called when the trace_pipe file is opened
521 * @close: called when the trace file is released
522 * @pipe_close: called when the trace_pipe file is released
523 * @read: override the default read callback on trace_pipe
524 * @splice_read: override the default splice_read callback on trace_pipe
525 * @selftest: selftest to run on boot (see trace_selftest.c)
526 * @print_headers: override the first lines that describe your columns
527 * @print_line: callback that prints a trace
528 * @set_flag: signals one of your private flags changed (trace_options file)
529 * @flags: your private flags
533 int (*init)(struct trace_array *tr);
534 void (*reset)(struct trace_array *tr);
535 void (*start)(struct trace_array *tr);
536 void (*stop)(struct trace_array *tr);
537 int (*update_thresh)(struct trace_array *tr);
538 void (*open)(struct trace_iterator *iter);
539 void (*pipe_open)(struct trace_iterator *iter);
540 void (*close)(struct trace_iterator *iter);
541 void (*pipe_close)(struct trace_iterator *iter);
542 ssize_t (*read)(struct trace_iterator *iter,
543 struct file *filp, char __user *ubuf,
544 size_t cnt, loff_t *ppos);
545 ssize_t (*splice_read)(struct trace_iterator *iter,
548 struct pipe_inode_info *pipe,
551 #ifdef CONFIG_FTRACE_STARTUP_TEST
552 int (*selftest)(struct tracer *trace,
553 struct trace_array *tr);
555 void (*print_header)(struct seq_file *m);
556 enum print_line_t (*print_line)(struct trace_iterator *iter);
557 /* If you handled the flag setting, return 0 */
558 int (*set_flag)(struct trace_array *tr,
559 u32 old_flags, u32 bit, int set);
560 /* Return 0 if OK with change, else return non-zero */
561 int (*flag_changed)(struct trace_array *tr,
564 struct tracer_flags *flags;
567 bool allow_instances;
568 #ifdef CONFIG_TRACER_MAX_TRACE
571 /* True if tracer cannot be enabled in kernel param */
575 static inline struct ring_buffer_iter *
576 trace_buffer_iter(struct trace_iterator *iter, int cpu)
578 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
581 int tracer_init(struct tracer *t, struct trace_array *tr);
582 int tracing_is_enabled(void);
583 void tracing_reset_online_cpus(struct array_buffer *buf);
584 void tracing_reset_current(int cpu);
585 void tracing_reset_all_online_cpus(void);
586 void tracing_reset_all_online_cpus_unlocked(void);
587 int tracing_open_generic(struct inode *inode, struct file *filp);
588 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
589 bool tracing_is_disabled(void);
590 bool tracer_tracing_is_on(struct trace_array *tr);
591 void tracer_tracing_on(struct trace_array *tr);
592 void tracer_tracing_off(struct trace_array *tr);
593 struct dentry *trace_create_file(const char *name,
595 struct dentry *parent,
597 const struct file_operations *fops);
599 int tracing_init_dentry(void);
601 struct ring_buffer_event;
603 struct ring_buffer_event *
604 trace_buffer_lock_reserve(struct trace_buffer *buffer,
607 unsigned int trace_ctx);
609 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
610 struct trace_array_cpu *data);
612 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
613 int *ent_cpu, u64 *ent_ts);
615 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
616 struct ring_buffer_event *event);
618 bool trace_is_tracepoint_string(const char *str);
619 const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
620 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
621 va_list ap) __printf(2, 0);
622 char *trace_iter_expand_format(struct trace_iterator *iter);
624 int trace_empty(struct trace_iterator *iter);
626 void *trace_find_next_entry_inc(struct trace_iterator *iter);
628 void trace_init_global_iter(struct trace_iterator *iter);
630 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
632 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
633 unsigned long trace_total_entries(struct trace_array *tr);
635 void trace_function(struct trace_array *tr,
637 unsigned long parent_ip,
638 unsigned int trace_ctx);
639 void trace_graph_function(struct trace_array *tr,
641 unsigned long parent_ip,
642 unsigned int trace_ctx);
643 void trace_latency_header(struct seq_file *m);
644 void trace_default_header(struct seq_file *m);
645 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
647 void trace_graph_return(struct ftrace_graph_ret *trace);
648 int trace_graph_entry(struct ftrace_graph_ent *trace);
649 void set_graph_array(struct trace_array *tr);
651 void tracing_start_cmdline_record(void);
652 void tracing_stop_cmdline_record(void);
653 void tracing_start_tgid_record(void);
654 void tracing_stop_tgid_record(void);
656 int register_tracer(struct tracer *type);
657 int is_tracing_stopped(void);
659 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
661 extern cpumask_var_t __read_mostly tracing_buffer_mask;
663 #define for_each_tracing_cpu(cpu) \
664 for_each_cpu(cpu, tracing_buffer_mask)
666 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
668 extern unsigned long tracing_thresh;
674 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
676 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
677 struct trace_pid_list *filtered_no_pids,
678 struct task_struct *task);
679 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
680 struct task_struct *self,
681 struct task_struct *task);
682 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
683 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
684 int trace_pid_show(struct seq_file *m, void *v);
685 void trace_free_pid_list(struct trace_pid_list *pid_list);
686 int trace_pid_write(struct trace_pid_list *filtered_pids,
687 struct trace_pid_list **new_pid_list,
688 const char __user *ubuf, size_t cnt);
690 #ifdef CONFIG_TRACER_MAX_TRACE
691 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
693 void update_max_tr_single(struct trace_array *tr,
694 struct task_struct *tsk, int cpu);
696 #ifdef CONFIG_FSNOTIFY
697 #define LATENCY_FS_NOTIFY
699 #endif /* CONFIG_TRACER_MAX_TRACE */
701 #ifdef LATENCY_FS_NOTIFY
702 void latency_fsnotify(struct trace_array *tr);
704 static inline void latency_fsnotify(struct trace_array *tr) { }
707 #ifdef CONFIG_STACKTRACE
708 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
710 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
714 #endif /* CONFIG_STACKTRACE */
716 void trace_last_func_repeats(struct trace_array *tr,
717 struct trace_func_repeats *last_info,
718 unsigned int trace_ctx);
720 extern u64 ftrace_now(int cpu);
722 extern void trace_find_cmdline(int pid, char comm[]);
723 extern int trace_find_tgid(int pid);
724 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
726 #ifdef CONFIG_DYNAMIC_FTRACE
727 extern unsigned long ftrace_update_tot_cnt;
728 extern unsigned long ftrace_number_of_pages;
729 extern unsigned long ftrace_number_of_groups;
730 void ftrace_init_trace_array(struct trace_array *tr);
732 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
734 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
735 extern int DYN_FTRACE_TEST_NAME(void);
736 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
737 extern int DYN_FTRACE_TEST_NAME2(void);
739 extern bool ring_buffer_expanded;
740 extern bool tracing_selftest_disabled;
742 #ifdef CONFIG_FTRACE_STARTUP_TEST
743 extern void __init disable_tracing_selftest(const char *reason);
745 extern int trace_selftest_startup_function(struct tracer *trace,
746 struct trace_array *tr);
747 extern int trace_selftest_startup_function_graph(struct tracer *trace,
748 struct trace_array *tr);
749 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
750 struct trace_array *tr);
751 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
752 struct trace_array *tr);
753 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
754 struct trace_array *tr);
755 extern int trace_selftest_startup_wakeup(struct tracer *trace,
756 struct trace_array *tr);
757 extern int trace_selftest_startup_nop(struct tracer *trace,
758 struct trace_array *tr);
759 extern int trace_selftest_startup_branch(struct tracer *trace,
760 struct trace_array *tr);
762 * Tracer data references selftest functions that only occur
763 * on boot up. These can be __init functions. Thus, when selftests
764 * are enabled, then the tracers need to reference __init functions.
766 #define __tracer_data __refdata
768 static inline void __init disable_tracing_selftest(const char *reason)
771 /* Tracers are seldom changed. Optimize when selftests are disabled. */
772 #define __tracer_data __read_mostly
773 #endif /* CONFIG_FTRACE_STARTUP_TEST */
775 extern void *head_page(struct trace_array_cpu *data);
776 extern unsigned long long ns2usecs(u64 nsec);
778 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
780 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
782 trace_array_vprintk(struct trace_array *tr,
783 unsigned long ip, const char *fmt, va_list args);
784 int trace_array_printk_buf(struct trace_buffer *buffer,
785 unsigned long ip, const char *fmt, ...);
786 void trace_printk_seq(struct trace_seq *s);
787 enum print_line_t print_trace_line(struct trace_iterator *iter);
789 extern char trace_find_mark(unsigned long long duration);
793 struct ftrace_mod_load {
794 struct list_head list;
801 FTRACE_HASH_FL_MOD = (1 << 0),
805 unsigned long size_bits;
806 struct hlist_head *buckets;
812 struct ftrace_func_entry *
813 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
815 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
817 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
820 /* Standard output formatting function used for function return traces */
821 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
824 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
825 #define TRACE_GRAPH_PRINT_CPU 0x2
826 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
827 #define TRACE_GRAPH_PRINT_PROC 0x8
828 #define TRACE_GRAPH_PRINT_DURATION 0x10
829 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
830 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
831 #define TRACE_GRAPH_PRINT_IRQS 0x80
832 #define TRACE_GRAPH_PRINT_TAIL 0x100
833 #define TRACE_GRAPH_SLEEP_TIME 0x200
834 #define TRACE_GRAPH_GRAPH_TIME 0x400
835 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
836 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
838 extern void ftrace_graph_sleep_time_control(bool enable);
840 #ifdef CONFIG_FUNCTION_PROFILER
841 extern void ftrace_graph_graph_time_control(bool enable);
843 static inline void ftrace_graph_graph_time_control(bool enable) { }
846 extern enum print_line_t
847 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
848 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
850 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
851 extern void graph_trace_open(struct trace_iterator *iter);
852 extern void graph_trace_close(struct trace_iterator *iter);
853 extern int __trace_graph_entry(struct trace_array *tr,
854 struct ftrace_graph_ent *trace,
855 unsigned int trace_ctx);
856 extern void __trace_graph_return(struct trace_array *tr,
857 struct ftrace_graph_ret *trace,
858 unsigned int trace_ctx);
860 #ifdef CONFIG_DYNAMIC_FTRACE
861 extern struct ftrace_hash __rcu *ftrace_graph_hash;
862 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
864 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
866 unsigned long addr = trace->func;
868 struct ftrace_hash *hash;
870 preempt_disable_notrace();
873 * Have to open code "rcu_dereference_sched()" because the
874 * function graph tracer can be called when RCU is not
876 * Protected with schedule_on_each_cpu(ftrace_sync)
878 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
880 if (ftrace_hash_empty(hash)) {
885 if (ftrace_lookup_ip(hash, addr)) {
888 * This needs to be cleared on the return functions
889 * when the depth is zero.
891 trace_recursion_set(TRACE_GRAPH_BIT);
892 trace_recursion_set_depth(trace->depth);
895 * If no irqs are to be traced, but a set_graph_function
896 * is set, and called by an interrupt handler, we still
900 trace_recursion_set(TRACE_IRQ_BIT);
902 trace_recursion_clear(TRACE_IRQ_BIT);
907 preempt_enable_notrace();
911 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
913 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
914 trace->depth == trace_recursion_depth())
915 trace_recursion_clear(TRACE_GRAPH_BIT);
918 static inline int ftrace_graph_notrace_addr(unsigned long addr)
921 struct ftrace_hash *notrace_hash;
923 preempt_disable_notrace();
926 * Have to open code "rcu_dereference_sched()" because the
927 * function graph tracer can be called when RCU is not
929 * Protected with schedule_on_each_cpu(ftrace_sync)
931 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
934 if (ftrace_lookup_ip(notrace_hash, addr))
937 preempt_enable_notrace();
941 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
946 static inline int ftrace_graph_notrace_addr(unsigned long addr)
950 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
952 #endif /* CONFIG_DYNAMIC_FTRACE */
954 extern unsigned int fgraph_max_depth;
956 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
958 /* trace it when it is-nested-in or is a function enabled. */
959 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
960 ftrace_graph_addr(trace)) ||
961 (trace->depth < 0) ||
962 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
965 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
966 static inline enum print_line_t
967 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
969 return TRACE_TYPE_UNHANDLED;
971 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
973 extern struct list_head ftrace_pids;
975 #ifdef CONFIG_FUNCTION_TRACER
977 #define FTRACE_PID_IGNORE -1
978 #define FTRACE_PID_TRACE -2
980 struct ftrace_func_command {
981 struct list_head list;
983 int (*func)(struct trace_array *tr,
984 struct ftrace_hash *hash,
985 char *func, char *cmd,
986 char *params, int enable);
988 extern bool ftrace_filter_param __initdata;
989 static inline int ftrace_trace_task(struct trace_array *tr)
991 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
994 extern int ftrace_is_dead(void);
995 int ftrace_create_function_files(struct trace_array *tr,
996 struct dentry *parent);
997 void ftrace_destroy_function_files(struct trace_array *tr);
998 int ftrace_allocate_ftrace_ops(struct trace_array *tr);
999 void ftrace_free_ftrace_ops(struct trace_array *tr);
1000 void ftrace_init_global_array_ops(struct trace_array *tr);
1001 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1002 void ftrace_reset_array_ops(struct trace_array *tr);
1003 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1004 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1005 struct dentry *d_tracer);
1006 void ftrace_clear_pids(struct trace_array *tr);
1007 int init_function_trace(void);
1008 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1010 static inline int ftrace_trace_task(struct trace_array *tr)
1014 static inline int ftrace_is_dead(void) { return 0; }
1016 ftrace_create_function_files(struct trace_array *tr,
1017 struct dentry *parent)
1021 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1025 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1026 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1027 static inline __init void
1028 ftrace_init_global_array_ops(struct trace_array *tr) { }
1029 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1030 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1031 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1032 static inline void ftrace_clear_pids(struct trace_array *tr) { }
1033 static inline int init_function_trace(void) { return 0; }
1034 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1035 /* ftace_func_t type is not defined, use macro instead of static inline */
1036 #define ftrace_init_array_ops(tr, func) do { } while (0)
1037 #endif /* CONFIG_FUNCTION_TRACER */
1039 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1041 struct ftrace_probe_ops {
1042 void (*func)(unsigned long ip,
1043 unsigned long parent_ip,
1044 struct trace_array *tr,
1045 struct ftrace_probe_ops *ops,
1047 int (*init)(struct ftrace_probe_ops *ops,
1048 struct trace_array *tr,
1049 unsigned long ip, void *init_data,
1051 void (*free)(struct ftrace_probe_ops *ops,
1052 struct trace_array *tr,
1053 unsigned long ip, void *data);
1054 int (*print)(struct seq_file *m,
1056 struct ftrace_probe_ops *ops,
1060 struct ftrace_func_mapper;
1061 typedef int (*ftrace_mapper_func)(void *data);
1063 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1064 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1066 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1067 unsigned long ip, void *data);
1068 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1070 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1071 ftrace_mapper_func free_func);
1074 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1075 struct ftrace_probe_ops *ops, void *data);
1077 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1078 struct ftrace_probe_ops *ops);
1079 extern void clear_ftrace_function_probes(struct trace_array *tr);
1081 int register_ftrace_command(struct ftrace_func_command *cmd);
1082 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1084 void ftrace_create_filter_files(struct ftrace_ops *ops,
1085 struct dentry *parent);
1086 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1088 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1089 int len, int reset);
1090 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1091 int len, int reset);
1093 struct ftrace_func_command;
1095 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1099 static inline __init int unregister_ftrace_command(char *cmd_name)
1103 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1108 * The ops parameter passed in is usually undefined.
1109 * This must be a macro.
1111 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1112 #define ftrace_destroy_filter_files(ops) do { } while (0)
1113 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1115 bool ftrace_event_is_function(struct trace_event_call *call);
1118 * struct trace_parser - servers for reading the user input separated by spaces
1119 * @cont: set if the input is not complete - no final space char was found
1120 * @buffer: holds the parsed user input
1121 * @idx: user input length
1122 * @size: buffer size
1124 struct trace_parser {
1131 static inline bool trace_parser_loaded(struct trace_parser *parser)
1133 return (parser->idx != 0);
1136 static inline bool trace_parser_cont(struct trace_parser *parser)
1138 return parser->cont;
1141 static inline void trace_parser_clear(struct trace_parser *parser)
1143 parser->cont = false;
1147 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1148 extern void trace_parser_put(struct trace_parser *parser);
1149 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1150 size_t cnt, loff_t *ppos);
1153 * Only create function graph options if function graph is configured.
1155 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1156 # define FGRAPH_FLAGS \
1157 C(DISPLAY_GRAPH, "display-graph"),
1159 # define FGRAPH_FLAGS
1162 #ifdef CONFIG_BRANCH_TRACER
1163 # define BRANCH_FLAGS \
1164 C(BRANCH, "branch"),
1166 # define BRANCH_FLAGS
1169 #ifdef CONFIG_FUNCTION_TRACER
1170 # define FUNCTION_FLAGS \
1171 C(FUNCTION, "function-trace"), \
1172 C(FUNC_FORK, "function-fork"),
1173 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1175 # define FUNCTION_FLAGS
1176 # define FUNCTION_DEFAULT_FLAGS 0UL
1177 # define TRACE_ITER_FUNC_FORK 0UL
1180 #ifdef CONFIG_STACKTRACE
1181 # define STACK_FLAGS \
1182 C(STACKTRACE, "stacktrace"),
1184 # define STACK_FLAGS
1188 * trace_iterator_flags is an enumeration that defines bit
1189 * positions into trace_flags that controls the output.
1191 * NOTE: These bits must match the trace_options array in
1192 * trace.c (this macro guarantees it).
1194 #define TRACE_FLAGS \
1195 C(PRINT_PARENT, "print-parent"), \
1196 C(SYM_OFFSET, "sym-offset"), \
1197 C(SYM_ADDR, "sym-addr"), \
1198 C(VERBOSE, "verbose"), \
1202 C(BLOCK, "block"), \
1203 C(FIELDS, "fields"), \
1204 C(PRINTK, "trace_printk"), \
1205 C(ANNOTATE, "annotate"), \
1206 C(USERSTACKTRACE, "userstacktrace"), \
1207 C(SYM_USEROBJ, "sym-userobj"), \
1208 C(PRINTK_MSGONLY, "printk-msg-only"), \
1209 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1210 C(LATENCY_FMT, "latency-format"), \
1211 C(RECORD_CMD, "record-cmd"), \
1212 C(RECORD_TGID, "record-tgid"), \
1213 C(OVERWRITE, "overwrite"), \
1214 C(STOP_ON_FREE, "disable_on_free"), \
1215 C(IRQ_INFO, "irq-info"), \
1216 C(MARKERS, "markers"), \
1217 C(EVENT_FORK, "event-fork"), \
1218 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1219 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1226 * By defining C, we can make TRACE_FLAGS a list of bit names
1227 * that will define the bits for the flag masks.
1230 #define C(a, b) TRACE_ITER_##a##_BIT
1232 enum trace_iterator_bits {
1234 /* Make sure we don't go more than we have bits for */
1239 * By redefining C, we can make TRACE_FLAGS a list of masks that
1240 * use the bits as defined above.
1243 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1245 enum trace_iterator_flags { TRACE_FLAGS };
1248 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1249 * control the output of kernel symbols.
1251 #define TRACE_ITER_SYM_MASK \
1252 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1254 extern struct tracer nop_trace;
1256 #ifdef CONFIG_BRANCH_TRACER
1257 extern int enable_branch_tracing(struct trace_array *tr);
1258 extern void disable_branch_tracing(void);
1259 static inline int trace_branch_enable(struct trace_array *tr)
1261 if (tr->trace_flags & TRACE_ITER_BRANCH)
1262 return enable_branch_tracing(tr);
1265 static inline void trace_branch_disable(void)
1267 /* due to races, always disable */
1268 disable_branch_tracing();
1271 static inline int trace_branch_enable(struct trace_array *tr)
1275 static inline void trace_branch_disable(void)
1278 #endif /* CONFIG_BRANCH_TRACER */
1280 /* set ring buffers to default size if not already done so */
1281 int tracing_update_buffers(void);
1283 struct ftrace_event_field {
1284 struct list_head link;
1296 struct event_filter {
1297 struct prog_entry __rcu *prog;
1298 char *filter_string;
1301 struct event_subsystem {
1302 struct list_head list;
1304 struct event_filter *filter;
1308 struct trace_subsystem_dir {
1309 struct list_head list;
1310 struct event_subsystem *subsystem;
1311 struct trace_array *tr;
1312 struct dentry *entry;
1317 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1318 struct trace_buffer *buffer,
1319 struct ring_buffer_event *event);
1321 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1322 struct trace_buffer *buffer,
1323 struct ring_buffer_event *event,
1324 unsigned int trcace_ctx,
1325 struct pt_regs *regs);
1327 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1328 struct trace_buffer *buffer,
1329 struct ring_buffer_event *event,
1330 unsigned int trace_ctx)
1332 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1335 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1336 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1337 void trace_buffered_event_disable(void);
1338 void trace_buffered_event_enable(void);
1340 void early_enable_events(struct trace_array *tr, char *buf, bool disable_first);
1343 __trace_event_discard_commit(struct trace_buffer *buffer,
1344 struct ring_buffer_event *event)
1346 if (this_cpu_read(trace_buffered_event) == event) {
1347 /* Simply release the temp buffer and enable preemption */
1348 this_cpu_dec(trace_buffered_event_cnt);
1349 preempt_enable_notrace();
1352 /* ring_buffer_discard_commit() enables preemption */
1353 ring_buffer_discard_commit(buffer, event);
1357 * Helper function for event_trigger_unlock_commit{_regs}().
1358 * If there are event triggers attached to this event that requires
1359 * filtering against its fields, then they will be called as the
1360 * entry already holds the field information of the current event.
1362 * It also checks if the event should be discarded or not.
1363 * It is to be discarded if the event is soft disabled and the
1364 * event was only recorded to process triggers, or if the event
1365 * filter is active and this event did not match the filters.
1367 * Returns true if the event is discarded, false otherwise.
1370 __event_trigger_test_discard(struct trace_event_file *file,
1371 struct trace_buffer *buffer,
1372 struct ring_buffer_event *event,
1374 enum event_trigger_type *tt)
1376 unsigned long eflags = file->flags;
1378 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1379 *tt = event_triggers_call(file, buffer, entry, event);
1381 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
1382 EVENT_FILE_FL_FILTERED |
1383 EVENT_FILE_FL_PID_FILTER))))
1386 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1389 if (file->flags & EVENT_FILE_FL_FILTERED &&
1390 !filter_match_preds(file->filter, entry))
1393 if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1394 trace_event_ignore_this_pid(file))
1399 __trace_event_discard_commit(buffer, event);
1404 * event_trigger_unlock_commit - handle triggers and finish event commit
1405 * @file: The file pointer associated with the event
1406 * @buffer: The ring buffer that the event is being written to
1407 * @event: The event meta data in the ring buffer
1408 * @entry: The event itself
1409 * @trace_ctx: The tracing context flags.
1411 * This is a helper function to handle triggers that require data
1412 * from the event itself. It also tests the event against filters and
1413 * if the event is soft disabled and should be discarded.
1416 event_trigger_unlock_commit(struct trace_event_file *file,
1417 struct trace_buffer *buffer,
1418 struct ring_buffer_event *event,
1419 void *entry, unsigned int trace_ctx)
1421 enum event_trigger_type tt = ETT_NONE;
1423 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1424 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1427 event_triggers_post_call(file, tt);
1430 #define FILTER_PRED_INVALID ((unsigned short)-1)
1431 #define FILTER_PRED_IS_RIGHT (1 << 15)
1432 #define FILTER_PRED_FOLD (1 << 15)
1435 * The max preds is the size of unsigned short with
1436 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1437 * and FOLD flags. The other is reserved.
1439 * 2^14 preds is way more than enough.
1441 #define MAX_FILTER_PRED 16384
1446 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1458 char pattern[MAX_FILTER_STR_VAL];
1461 regex_match_func match;
1464 static inline bool is_string_field(struct ftrace_event_field *field)
1466 return field->filter_type == FILTER_DYN_STRING ||
1467 field->filter_type == FILTER_RDYN_STRING ||
1468 field->filter_type == FILTER_STATIC_STRING ||
1469 field->filter_type == FILTER_PTR_STRING ||
1470 field->filter_type == FILTER_COMM;
1473 static inline bool is_function_field(struct ftrace_event_field *field)
1475 return field->filter_type == FILTER_TRACE_FN;
1478 extern enum regex_type
1479 filter_parse_regex(char *buff, int len, char **search, int *not);
1480 extern void print_event_filter(struct trace_event_file *file,
1481 struct trace_seq *s);
1482 extern int apply_event_filter(struct trace_event_file *file,
1483 char *filter_string);
1484 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1485 char *filter_string);
1486 extern void print_subsystem_event_filter(struct event_subsystem *system,
1487 struct trace_seq *s);
1488 extern int filter_assign_type(const char *type);
1489 extern int create_event_filter(struct trace_array *tr,
1490 struct trace_event_call *call,
1491 char *filter_str, bool set_str,
1492 struct event_filter **filterp);
1493 extern void free_event_filter(struct event_filter *filter);
1495 struct ftrace_event_field *
1496 trace_find_event_field(struct trace_event_call *call, char *name);
1498 extern void trace_event_enable_cmd_record(bool enable);
1499 extern void trace_event_enable_tgid_record(bool enable);
1501 extern int event_trace_init(void);
1502 extern int init_events(void);
1503 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1504 extern int event_trace_del_tracer(struct trace_array *tr);
1505 extern void __trace_early_add_events(struct trace_array *tr);
1507 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1510 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1514 static inline void *event_file_data(struct file *filp)
1516 return READ_ONCE(file_inode(filp)->i_private);
1519 extern struct mutex event_mutex;
1520 extern struct list_head ftrace_events;
1522 extern const struct file_operations event_trigger_fops;
1523 extern const struct file_operations event_hist_fops;
1524 extern const struct file_operations event_hist_debug_fops;
1525 extern const struct file_operations event_inject_fops;
1527 #ifdef CONFIG_HIST_TRIGGERS
1528 extern int register_trigger_hist_cmd(void);
1529 extern int register_trigger_hist_enable_disable_cmds(void);
1531 static inline int register_trigger_hist_cmd(void) { return 0; }
1532 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1535 extern int register_trigger_cmds(void);
1536 extern void clear_event_triggers(struct trace_array *tr);
1539 EVENT_TRIGGER_FL_PROBE = BIT(0),
1542 struct event_trigger_data {
1543 unsigned long count;
1546 struct event_trigger_ops *ops;
1547 struct event_command *cmd_ops;
1548 struct event_filter __rcu *filter;
1553 struct list_head list;
1555 struct list_head named_list;
1556 struct event_trigger_data *named_data;
1560 #define ENABLE_EVENT_STR "enable_event"
1561 #define DISABLE_EVENT_STR "disable_event"
1562 #define ENABLE_HIST_STR "enable_hist"
1563 #define DISABLE_HIST_STR "disable_hist"
1565 struct enable_trigger_data {
1566 struct trace_event_file *file;
1571 extern int event_enable_trigger_print(struct seq_file *m,
1572 struct event_trigger_data *data);
1573 extern void event_enable_trigger_free(struct event_trigger_data *data);
1574 extern int event_enable_trigger_parse(struct event_command *cmd_ops,
1575 struct trace_event_file *file,
1576 char *glob, char *cmd,
1577 char *param_and_filter);
1578 extern int event_enable_register_trigger(char *glob,
1579 struct event_trigger_data *data,
1580 struct trace_event_file *file);
1581 extern void event_enable_unregister_trigger(char *glob,
1582 struct event_trigger_data *test,
1583 struct trace_event_file *file);
1584 extern void trigger_data_free(struct event_trigger_data *data);
1585 extern int event_trigger_init(struct event_trigger_data *data);
1586 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1587 int trigger_enable);
1588 extern void update_cond_flag(struct trace_event_file *file);
1589 extern int set_trigger_filter(char *filter_str,
1590 struct event_trigger_data *trigger_data,
1591 struct trace_event_file *file);
1592 extern struct event_trigger_data *find_named_trigger(const char *name);
1593 extern bool is_named_trigger(struct event_trigger_data *test);
1594 extern int save_named_trigger(const char *name,
1595 struct event_trigger_data *data);
1596 extern void del_named_trigger(struct event_trigger_data *data);
1597 extern void pause_named_trigger(struct event_trigger_data *data);
1598 extern void unpause_named_trigger(struct event_trigger_data *data);
1599 extern void set_named_trigger_data(struct event_trigger_data *data,
1600 struct event_trigger_data *named_data);
1601 extern struct event_trigger_data *
1602 get_named_trigger_data(struct event_trigger_data *data);
1603 extern int register_event_command(struct event_command *cmd);
1604 extern int unregister_event_command(struct event_command *cmd);
1605 extern int register_trigger_hist_enable_disable_cmds(void);
1606 extern bool event_trigger_check_remove(const char *glob);
1607 extern bool event_trigger_empty_param(const char *param);
1608 extern int event_trigger_separate_filter(char *param_and_filter, char **param,
1609 char **filter, bool param_required);
1610 extern struct event_trigger_data *
1611 event_trigger_alloc(struct event_command *cmd_ops,
1614 void *private_data);
1615 extern int event_trigger_parse_num(char *trigger,
1616 struct event_trigger_data *trigger_data);
1617 extern int event_trigger_set_filter(struct event_command *cmd_ops,
1618 struct trace_event_file *file,
1620 struct event_trigger_data *trigger_data);
1621 extern void event_trigger_reset_filter(struct event_command *cmd_ops,
1622 struct event_trigger_data *trigger_data);
1623 extern int event_trigger_register(struct event_command *cmd_ops,
1624 struct trace_event_file *file,
1626 struct event_trigger_data *trigger_data);
1627 extern void event_trigger_unregister(struct event_command *cmd_ops,
1628 struct trace_event_file *file,
1630 struct event_trigger_data *trigger_data);
1633 * struct event_trigger_ops - callbacks for trace event triggers
1635 * The methods in this structure provide per-event trigger hooks for
1636 * various trigger operations.
1638 * The @init and @free methods are used during trigger setup and
1639 * teardown, typically called from an event_command's @parse()
1640 * function implementation.
1642 * The @print method is used to print the trigger spec.
1644 * The @trigger method is the function that actually implements the
1645 * trigger and is called in the context of the triggering event
1646 * whenever that event occurs.
1648 * All the methods below, except for @init() and @free(), must be
1651 * @trigger: The trigger 'probe' function called when the triggering
1652 * event occurs. The data passed into this callback is the data
1653 * that was supplied to the event_command @reg() function that
1654 * registered the trigger (see struct event_command) along with
1655 * the trace record, rec.
1657 * @init: An optional initialization function called for the trigger
1658 * when the trigger is registered (via the event_command reg()
1659 * function). This can be used to perform per-trigger
1660 * initialization such as incrementing a per-trigger reference
1661 * count, for instance. This is usually implemented by the
1662 * generic utility function @event_trigger_init() (see
1663 * trace_event_triggers.c).
1665 * @free: An optional de-initialization function called for the
1666 * trigger when the trigger is unregistered (via the
1667 * event_command @reg() function). This can be used to perform
1668 * per-trigger de-initialization such as decrementing a
1669 * per-trigger reference count and freeing corresponding trigger
1670 * data, for instance. This is usually implemented by the
1671 * generic utility function @event_trigger_free() (see
1672 * trace_event_triggers.c).
1674 * @print: The callback function invoked to have the trigger print
1675 * itself. This is usually implemented by a wrapper function
1676 * that calls the generic utility function @event_trigger_print()
1677 * (see trace_event_triggers.c).
1679 struct event_trigger_ops {
1680 void (*trigger)(struct event_trigger_data *data,
1681 struct trace_buffer *buffer,
1683 struct ring_buffer_event *rbe);
1684 int (*init)(struct event_trigger_data *data);
1685 void (*free)(struct event_trigger_data *data);
1686 int (*print)(struct seq_file *m,
1687 struct event_trigger_data *data);
1691 * struct event_command - callbacks and data members for event commands
1693 * Event commands are invoked by users by writing the command name
1694 * into the 'trigger' file associated with a trace event. The
1695 * parameters associated with a specific invocation of an event
1696 * command are used to create an event trigger instance, which is
1697 * added to the list of trigger instances associated with that trace
1698 * event. When the event is hit, the set of triggers associated with
1699 * that event is invoked.
1701 * The data members in this structure provide per-event command data
1702 * for various event commands.
1704 * All the data members below, except for @post_trigger, must be set
1705 * for each event command.
1707 * @name: The unique name that identifies the event command. This is
1708 * the name used when setting triggers via trigger files.
1710 * @trigger_type: A unique id that identifies the event command
1711 * 'type'. This value has two purposes, the first to ensure that
1712 * only one trigger of the same type can be set at a given time
1713 * for a particular event e.g. it doesn't make sense to have both
1714 * a traceon and traceoff trigger attached to a single event at
1715 * the same time, so traceon and traceoff have the same type
1716 * though they have different names. The @trigger_type value is
1717 * also used as a bit value for deferring the actual trigger
1718 * action until after the current event is finished. Some
1719 * commands need to do this if they themselves log to the trace
1720 * buffer (see the @post_trigger() member below). @trigger_type
1721 * values are defined by adding new values to the trigger_type
1722 * enum in include/linux/trace_events.h.
1724 * @flags: See the enum event_command_flags below.
1726 * All the methods below, except for @set_filter() and @unreg_all(),
1727 * must be implemented.
1729 * @parse: The callback function responsible for parsing and
1730 * registering the trigger written to the 'trigger' file by the
1731 * user. It allocates the trigger instance and registers it with
1732 * the appropriate trace event. It makes use of the other
1733 * event_command callback functions to orchestrate this, and is
1734 * usually implemented by the generic utility function
1735 * @event_trigger_callback() (see trace_event_triggers.c).
1737 * @reg: Adds the trigger to the list of triggers associated with the
1738 * event, and enables the event trigger itself, after
1739 * initializing it (via the event_trigger_ops @init() function).
1740 * This is also where commands can use the @trigger_type value to
1741 * make the decision as to whether or not multiple instances of
1742 * the trigger should be allowed. This is usually implemented by
1743 * the generic utility function @register_trigger() (see
1744 * trace_event_triggers.c).
1746 * @unreg: Removes the trigger from the list of triggers associated
1747 * with the event, and disables the event trigger itself, after
1748 * initializing it (via the event_trigger_ops @free() function).
1749 * This is usually implemented by the generic utility function
1750 * @unregister_trigger() (see trace_event_triggers.c).
1752 * @unreg_all: An optional function called to remove all the triggers
1753 * from the list of triggers associated with the event. Called
1754 * when a trigger file is opened in truncate mode.
1756 * @set_filter: An optional function called to parse and set a filter
1757 * for the trigger. If no @set_filter() method is set for the
1758 * event command, filters set by the user for the command will be
1759 * ignored. This is usually implemented by the generic utility
1760 * function @set_trigger_filter() (see trace_event_triggers.c).
1762 * @get_trigger_ops: The callback function invoked to retrieve the
1763 * event_trigger_ops implementation associated with the command.
1764 * This callback function allows a single event_command to
1765 * support multiple trigger implementations via different sets of
1766 * event_trigger_ops, depending on the value of the @param
1769 struct event_command {
1770 struct list_head list;
1772 enum event_trigger_type trigger_type;
1774 int (*parse)(struct event_command *cmd_ops,
1775 struct trace_event_file *file,
1776 char *glob, char *cmd,
1777 char *param_and_filter);
1778 int (*reg)(char *glob,
1779 struct event_trigger_data *data,
1780 struct trace_event_file *file);
1781 void (*unreg)(char *glob,
1782 struct event_trigger_data *data,
1783 struct trace_event_file *file);
1784 void (*unreg_all)(struct trace_event_file *file);
1785 int (*set_filter)(char *filter_str,
1786 struct event_trigger_data *data,
1787 struct trace_event_file *file);
1788 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1792 * enum event_command_flags - flags for struct event_command
1794 * @POST_TRIGGER: A flag that says whether or not this command needs
1795 * to have its action delayed until after the current event has
1796 * been closed. Some triggers need to avoid being invoked while
1797 * an event is currently in the process of being logged, since
1798 * the trigger may itself log data into the trace buffer. Thus
1799 * we make sure the current event is committed before invoking
1800 * those triggers. To do that, the trigger invocation is split
1801 * in two - the first part checks the filter using the current
1802 * trace record; if a command has the @post_trigger flag set, it
1803 * sets a bit for itself in the return value, otherwise it
1804 * directly invokes the trigger. Once all commands have been
1805 * either invoked or set their return flag, the current record is
1806 * either committed or discarded. At that point, if any commands
1807 * have deferred their triggers, those commands are finally
1808 * invoked following the close of the current event. In other
1809 * words, if the event_trigger_ops @func() probe implementation
1810 * itself logs to the trace buffer, this flag should be set,
1811 * otherwise it can be left unspecified.
1813 * @NEEDS_REC: A flag that says whether or not this command needs
1814 * access to the trace record in order to perform its function,
1815 * regardless of whether or not it has a filter associated with
1816 * it (filters make a trigger require access to the trace record
1817 * but are not always present).
1819 enum event_command_flags {
1820 EVENT_CMD_FL_POST_TRIGGER = 1,
1821 EVENT_CMD_FL_NEEDS_REC = 2,
1824 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1826 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1829 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1831 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1834 extern int trace_event_enable_disable(struct trace_event_file *file,
1835 int enable, int soft_disable);
1836 extern int tracing_alloc_snapshot(void);
1837 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1838 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1840 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1841 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1843 extern const char *__start___trace_bprintk_fmt[];
1844 extern const char *__stop___trace_bprintk_fmt[];
1846 extern const char *__start___tracepoint_str[];
1847 extern const char *__stop___tracepoint_str[];
1849 void trace_printk_control(bool enabled);
1850 void trace_printk_start_comm(void);
1851 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1852 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1854 /* Used from boot time tracer */
1855 extern int trace_set_options(struct trace_array *tr, char *option);
1856 extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1857 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1858 unsigned long size, int cpu_id);
1859 extern int tracing_set_cpumask(struct trace_array *tr,
1860 cpumask_var_t tracing_cpumask_new);
1863 #define MAX_EVENT_NAME_LEN 64
1865 extern ssize_t trace_parse_run_command(struct file *file,
1866 const char __user *buffer, size_t count, loff_t *ppos,
1867 int (*createfn)(const char *));
1869 extern unsigned int err_pos(char *cmd, const char *str);
1870 extern void tracing_log_err(struct trace_array *tr,
1871 const char *loc, const char *cmd,
1872 const char **errs, u8 type, u16 pos);
1875 * Normal trace_printk() and friends allocates special buffers
1876 * to do the manipulation, as well as saves the print formats
1877 * into sections to display. But the trace infrastructure wants
1878 * to use these without the added overhead at the price of being
1879 * a bit slower (used mainly for warnings, where we don't care
1880 * about performance). The internal_trace_puts() is for such
1883 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1886 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1887 extern struct trace_event_call \
1888 __aligned(4) event_##call;
1889 #undef FTRACE_ENTRY_DUP
1890 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1891 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1892 #undef FTRACE_ENTRY_PACKED
1893 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1894 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1896 #include "trace_entries.h"
1898 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1899 int perf_ftrace_event_register(struct trace_event_call *call,
1900 enum trace_reg type, void *data);
1902 #define perf_ftrace_event_register NULL
1905 #ifdef CONFIG_FTRACE_SYSCALLS
1906 void init_ftrace_syscalls(void);
1907 const char *get_syscall_name(int syscall);
1909 static inline void init_ftrace_syscalls(void) { }
1910 static inline const char *get_syscall_name(int syscall)
1916 #ifdef CONFIG_EVENT_TRACING
1917 void trace_event_init(void);
1918 void trace_event_eval_update(struct trace_eval_map **map, int len);
1919 /* Used from boot time tracer */
1920 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1921 extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1923 static inline void __init trace_event_init(void) { }
1924 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1927 #ifdef CONFIG_TRACER_SNAPSHOT
1928 void tracing_snapshot_instance(struct trace_array *tr);
1929 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1931 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1932 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1938 #ifdef CONFIG_PREEMPT_TRACER
1939 void tracer_preempt_on(unsigned long a0, unsigned long a1);
1940 void tracer_preempt_off(unsigned long a0, unsigned long a1);
1942 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1943 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1945 #ifdef CONFIG_IRQSOFF_TRACER
1946 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1947 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1949 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1950 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1954 * Reset the state of the trace_iterator so that it can read consumed data.
1955 * Normally, the trace_iterator is used for reading the data when it is not
1956 * consumed, and must retain state.
1958 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1960 memset_startat(iter, 0, seq);
1964 /* Check the name is good for event/group/fields */
1965 static inline bool __is_good_name(const char *name, bool hash_ok)
1967 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-'))
1969 while (*++name != '\0') {
1970 if (!isalpha(*name) && !isdigit(*name) && *name != '_' &&
1971 (!hash_ok || *name != '-'))
1977 /* Check the name is good for event/group/fields */
1978 static inline bool is_good_name(const char *name)
1980 return __is_good_name(name, false);
1983 /* Check the name is good for system */
1984 static inline bool is_good_system_name(const char *name)
1986 return __is_good_name(name, true);
1989 /* Convert certain expected symbols into '_' when generating event names */
1990 static inline void sanitize_event_name(char *name)
1992 while (*name++ != '\0')
1993 if (*name == ':' || *name == '.')
1998 * This is a generic way to read and write a u64 value from a file in tracefs.
2000 * The value is stored on the variable pointed by *val. The value needs
2001 * to be at least *min and at most *max. The write is protected by an
2004 struct trace_min_max_param {
2011 #define U64_STR_SIZE 24 /* 20 digits max */
2013 extern const struct file_operations trace_min_max_fops;
2016 extern int rv_init_interface(void);
2018 static inline int rv_init_interface(void)
2024 #endif /* _LINUX_KERNEL_TRACE_H */