projects/linux·blob v6.4 · refs

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1// SPDX-License-Identifier: GPL-2.0
2
3#ifndef _LINUX_KERNEL_TRACE_H
4#define _LINUX_KERNEL_TRACE_H
5
6#include <linux/fs.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>
24
25#include "pid_list.h"
26
27#ifdef CONFIG_FTRACE_SYSCALLS
28#include <asm/unistd.h> /* For NR_syscalls */
29#include <asm/syscall.h> /* some archs define it here */
30#endif
31
32#define TRACE_MODE_WRITE 0640
33#define TRACE_MODE_READ 0440
34
35enum trace_type {
36 __TRACE_FIRST_TYPE = 0,
37
38 TRACE_FN,
39 TRACE_CTX,
40 TRACE_WAKE,
41 TRACE_STACK,
42 TRACE_PRINT,
43 TRACE_BPRINT,
44 TRACE_MMIO_RW,
45 TRACE_MMIO_MAP,
46 TRACE_BRANCH,
47 TRACE_GRAPH_RET,
48 TRACE_GRAPH_ENT,
49 TRACE_USER_STACK,
50 TRACE_BLK,
51 TRACE_BPUTS,
52 TRACE_HWLAT,
53 TRACE_OSNOISE,
54 TRACE_TIMERLAT,
55 TRACE_RAW_DATA,
56 TRACE_FUNC_REPEATS,
57
58 __TRACE_LAST_TYPE,
59};
60
61
62#undef __field
63#define __field(type, item) type item;
64
65#undef __field_fn
66#define __field_fn(type, item) type item;
67
68#undef __field_struct
69#define __field_struct(type, item) __field(type, item)
70
71#undef __field_desc
72#define __field_desc(type, container, item)
73
74#undef __field_packed
75#define __field_packed(type, container, item)
76
77#undef __array
78#define __array(type, item, size) type item[size];
79
80#undef __array_desc
81#define __array_desc(type, container, item, size)
82
83#undef __dynamic_array
84#define __dynamic_array(type, item) type item[];
85
86#undef __rel_dynamic_array
87#define __rel_dynamic_array(type, item) type item[];
88
89#undef F_STRUCT
90#define F_STRUCT(args...) args
91
92#undef FTRACE_ENTRY
93#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
94 struct struct_name { \
95 struct trace_entry ent; \
96 tstruct \
97 }
98
99#undef FTRACE_ENTRY_DUP
100#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
101
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))
105
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
109
110#include "trace_entries.h"
111
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__)
115
116#define HIST_STACKTRACE_DEPTH 16
117#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
118#define HIST_STACKTRACE_SKIP 5
119
120/*
121 * syscalls are special, and need special handling, this is why
122 * they are not included in trace_entries.h
123 */
124struct syscall_trace_enter {
125 struct trace_entry ent;
126 int nr;
127 unsigned long args[];
128};
129
130struct syscall_trace_exit {
131 struct trace_entry ent;
132 int nr;
133 long ret;
134};
135
136struct kprobe_trace_entry_head {
137 struct trace_entry ent;
138 unsigned long ip;
139};
140
141struct eprobe_trace_entry_head {
142 struct trace_entry ent;
143};
144
145struct kretprobe_trace_entry_head {
146 struct trace_entry ent;
147 unsigned long func;
148 unsigned long ret_ip;
149};
150
151#define TRACE_BUF_SIZE 1024
152
153struct trace_array;
154
155/*
156 * The CPU trace array - it consists of thousands of trace entries
157 * plus some other descriptor data: (for example which task started
158 * the trace, etc.)
159 */
160struct trace_array_cpu {
161 atomic_t disabled;
162 void *buffer_page; /* ring buffer spare */
163
164 unsigned long entries;
165 unsigned long saved_latency;
166 unsigned long critical_start;
167 unsigned long critical_end;
168 unsigned long critical_sequence;
169 unsigned long nice;
170 unsigned long policy;
171 unsigned long rt_priority;
172 unsigned long skipped_entries;
173 u64 preempt_timestamp;
174 pid_t pid;
175 kuid_t uid;
176 char comm[TASK_COMM_LEN];
177
178#ifdef CONFIG_FUNCTION_TRACER
179 int ftrace_ignore_pid;
180#endif
181 bool ignore_pid;
182};
183
184struct tracer;
185struct trace_option_dentry;
186
187struct array_buffer {
188 struct trace_array *tr;
189 struct trace_buffer *buffer;
190 struct trace_array_cpu __percpu *data;
191 u64 time_start;
192 int cpu;
193};
194
195#define TRACE_FLAGS_MAX_SIZE 32
196
197struct trace_options {
198 struct tracer *tracer;
199 struct trace_option_dentry *topts;
200};
201
202struct trace_pid_list *trace_pid_list_alloc(void);
203void trace_pid_list_free(struct trace_pid_list *pid_list);
204bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
205int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
206int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
207int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid);
208int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
209 unsigned int *next);
210
211enum {
212 TRACE_PIDS = BIT(0),
213 TRACE_NO_PIDS = BIT(1),
214};
215
216static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
217 struct trace_pid_list *no_pid_list)
218{
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);
222}
223
224static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
225 struct trace_pid_list *no_pid_list)
226{
227 /*
228 * Turning off what is in @type, return true if the "other"
229 * pid list, still has pids in it.
230 */
231 return (!(type & TRACE_PIDS) && pid_list) ||
232 (!(type & TRACE_NO_PIDS) && no_pid_list);
233}
234
235typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
236
237/**
238 * struct cond_snapshot - conditional snapshot data and callback
239 *
240 * The cond_snapshot structure encapsulates a callback function and
241 * data associated with the snapshot for a given tracing instance.
242 *
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.
252 *
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.
257 *
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().
263 *
264 * The method below is required.
265 *
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.
274 */
275struct cond_snapshot {
276 void *cond_data;
277 cond_update_fn_t update;
278};
279
280/*
281 * struct trace_func_repeats - used to keep track of the consecutive
282 * (on the same CPU) calls of a single function.
283 */
284struct trace_func_repeats {
285 unsigned long ip;
286 unsigned long parent_ip;
287 unsigned long count;
288 u64 ts_last_call;
289};
290
291/*
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:
295 */
296struct trace_array {
297 struct list_head list;
298 char *name;
299 struct array_buffer array_buffer;
300#ifdef CONFIG_TRACER_MAX_TRACE
301 /*
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.
306 *
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.
311 */
312 struct array_buffer max_buffer;
313 bool allocated_snapshot;
314#endif
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;
321#endif
322#endif
323 struct trace_pid_list __rcu *filtered_pids;
324 struct trace_pid_list __rcu *filtered_no_pids;
325 /*
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.
330 *
331 * This is defined as a arch_spinlock_t in order to help
332 * with performance when lockdep debugging is enabled.
333 *
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.
337 */
338 arch_spinlock_t max_lock;
339 int buffer_disabled;
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];
345#endif
346 int stop_count;
347 int clock_id;
348 int nr_topts;
349 bool clear_trace;
350 int buffer_percent;
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];
355 unsigned int flags;
356 raw_spinlock_t start_lock;
357 struct list_head err_log;
358 struct dentry *dir;
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 */
367 int ref;
368 int trace_ref;
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;
378#endif
379 /* function tracing enabled */
380 int function_enabled;
381#endif
382 int no_filter_buffering_ref;
383 struct list_head hist_vars;
384#ifdef CONFIG_TRACER_SNAPSHOT
385 struct cond_snapshot *cond_snapshot;
386#endif
387 struct trace_func_repeats __percpu *last_func_repeats;
388};
389
390enum {
391 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
392};
393
394extern struct list_head ftrace_trace_arrays;
395
396extern struct mutex trace_types_lock;
397
398extern int trace_array_get(struct trace_array *tr);
399extern int tracing_check_open_get_tr(struct trace_array *tr);
400extern struct trace_array *trace_array_find(const char *instance);
401extern struct trace_array *trace_array_find_get(const char *instance);
402
403extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
404extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
405extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
406
407extern bool trace_clock_in_ns(struct trace_array *tr);
408
409/*
410 * The global tracer (top) should be the first trace array added,
411 * but we check the flag anyway.
412 */
413static inline struct trace_array *top_trace_array(void)
414{
415 struct trace_array *tr;
416
417 if (list_empty(&ftrace_trace_arrays))
418 return NULL;
419
420 tr = list_entry(ftrace_trace_arrays.prev,
421 typeof(*tr), list);
422 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
423 return tr;
424}
425
426#define FTRACE_CMP_TYPE(var, type) \
427 __builtin_types_compatible_p(typeof(var), type *)
428
429#undef IF_ASSIGN
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); \
434 break; \
435 }
436
437/* Will cause compile errors if type is not found. */
438extern void __ftrace_bad_type(void);
439
440/*
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:
444 *
445 * IF_ASSIGN(var, ent, type, id);
446 *
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.
450 *
451 * If the type can have more than one id, then use zero.
452 */
453#define trace_assign_type(var, ent) \
454 do { \
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, \
467 TRACE_MMIO_RW); \
468 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
469 TRACE_MMIO_MAP); \
470 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
471 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
472 TRACE_GRAPH_ENT); \
473 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
474 TRACE_GRAPH_RET); \
475 IF_ASSIGN(var, ent, struct func_repeats_entry, \
476 TRACE_FUNC_REPEATS); \
477 __ftrace_bad_type(); \
478 } while (0)
479
480/*
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.
484 */
485struct tracer_opt {
486 const char *name; /* Will appear on the trace_options file */
487 u32 bit; /* Mask assigned in val field in tracer_flags */
488};
489
490/*
491 * The set of specific options for a tracer. Your tracer
492 * have to set the initial value of the flags val.
493 */
494struct tracer_flags {
495 u32 val;
496 struct tracer_opt *opts;
497 struct tracer *trace;
498};
499
500/* Makes more easy to define a tracer opt */
501#define TRACER_OPT(s, b) .name = #s, .bit = b
502
503
504struct trace_option_dentry {
505 struct tracer_opt *opt;
506 struct tracer_flags *flags;
507 struct trace_array *tr;
508 struct dentry *entry;
509};
510
511/**
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
530 */
531struct tracer {
532 const char *name;
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,
546 struct file *filp,
547 loff_t *ppos,
548 struct pipe_inode_info *pipe,
549 size_t len,
550 unsigned int flags);
551#ifdef CONFIG_FTRACE_STARTUP_TEST
552 int (*selftest)(struct tracer *trace,
553 struct trace_array *tr);
554#endif
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,
562 u32 mask, int set);
563 struct tracer *next;
564 struct tracer_flags *flags;
565 int enabled;
566 bool print_max;
567 bool allow_instances;
568#ifdef CONFIG_TRACER_MAX_TRACE
569 bool use_max_tr;
570#endif
571 /* True if tracer cannot be enabled in kernel param */
572 bool noboot;
573};
574
575static inline struct ring_buffer_iter *
576trace_buffer_iter(struct trace_iterator *iter, int cpu)
577{
578 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
579}
580
581int tracer_init(struct tracer *t, struct trace_array *tr);
582int tracing_is_enabled(void);
583void tracing_reset_online_cpus(struct array_buffer *buf);
584void tracing_reset_current(int cpu);
585void tracing_reset_all_online_cpus(void);
586void tracing_reset_all_online_cpus_unlocked(void);
587int tracing_open_generic(struct inode *inode, struct file *filp);
588int tracing_open_generic_tr(struct inode *inode, struct file *filp);
589bool tracing_is_disabled(void);
590bool tracer_tracing_is_on(struct trace_array *tr);
591void tracer_tracing_on(struct trace_array *tr);
592void tracer_tracing_off(struct trace_array *tr);
593struct dentry *trace_create_file(const char *name,
594 umode_t mode,
595 struct dentry *parent,
596 void *data,
597 const struct file_operations *fops);
598
599int tracing_init_dentry(void);
600
601struct ring_buffer_event;
602
603struct ring_buffer_event *
604trace_buffer_lock_reserve(struct trace_buffer *buffer,
605 int type,
606 unsigned long len,
607 unsigned int trace_ctx);
608
609struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
610 struct trace_array_cpu *data);
611
612struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
613 int *ent_cpu, u64 *ent_ts);
614
615void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
616 struct ring_buffer_event *event);
617
618bool trace_is_tracepoint_string(const char *str);
619const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
620void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
621 va_list ap) __printf(2, 0);
622char *trace_iter_expand_format(struct trace_iterator *iter);
623
624int trace_empty(struct trace_iterator *iter);
625
626void *trace_find_next_entry_inc(struct trace_iterator *iter);
627
628void trace_init_global_iter(struct trace_iterator *iter);
629
630void tracing_iter_reset(struct trace_iterator *iter, int cpu);
631
632unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
633unsigned long trace_total_entries(struct trace_array *tr);
634
635void trace_function(struct trace_array *tr,
636 unsigned long ip,
637 unsigned long parent_ip,
638 unsigned int trace_ctx);
639void trace_graph_function(struct trace_array *tr,
640 unsigned long ip,
641 unsigned long parent_ip,
642 unsigned int trace_ctx);
643void trace_latency_header(struct seq_file *m);
644void trace_default_header(struct seq_file *m);
645void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
646
647void trace_graph_return(struct ftrace_graph_ret *trace);
648int trace_graph_entry(struct ftrace_graph_ent *trace);
649void set_graph_array(struct trace_array *tr);
650
651void tracing_start_cmdline_record(void);
652void tracing_stop_cmdline_record(void);
653void tracing_start_tgid_record(void);
654void tracing_stop_tgid_record(void);
655
656int register_tracer(struct tracer *type);
657int is_tracing_stopped(void);
658
659loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
660
661extern cpumask_var_t __read_mostly tracing_buffer_mask;
662
663#define for_each_tracing_cpu(cpu) \
664 for_each_cpu(cpu, tracing_buffer_mask)
665
666extern unsigned long nsecs_to_usecs(unsigned long nsecs);
667
668extern unsigned long tracing_thresh;
669
670/* PID filtering */
671
672extern int pid_max;
673
674bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
675 pid_t search_pid);
676bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
677 struct trace_pid_list *filtered_no_pids,
678 struct task_struct *task);
679void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
680 struct task_struct *self,
681 struct task_struct *task);
682void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
683void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
684int trace_pid_show(struct seq_file *m, void *v);
685void trace_free_pid_list(struct trace_pid_list *pid_list);
686int 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);
689
690#ifdef CONFIG_TRACER_MAX_TRACE
691void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
692 void *cond_data);
693void update_max_tr_single(struct trace_array *tr,
694 struct task_struct *tsk, int cpu);
695
696#ifdef CONFIG_FSNOTIFY
697#define LATENCY_FS_NOTIFY
698#endif
699#endif /* CONFIG_TRACER_MAX_TRACE */
700
701#ifdef LATENCY_FS_NOTIFY
702void latency_fsnotify(struct trace_array *tr);
703#else
704static inline void latency_fsnotify(struct trace_array *tr) { }
705#endif
706
707#ifdef CONFIG_STACKTRACE
708void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
709#else
710static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
711 int skip)
712{
713}
714#endif /* CONFIG_STACKTRACE */
715
716void trace_last_func_repeats(struct trace_array *tr,
717 struct trace_func_repeats *last_info,
718 unsigned int trace_ctx);
719
720extern u64 ftrace_now(int cpu);
721
722extern void trace_find_cmdline(int pid, char comm[]);
723extern int trace_find_tgid(int pid);
724extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
725
726#ifdef CONFIG_DYNAMIC_FTRACE
727extern unsigned long ftrace_update_tot_cnt;
728extern unsigned long ftrace_number_of_pages;
729extern unsigned long ftrace_number_of_groups;
730void ftrace_init_trace_array(struct trace_array *tr);
731#else
732static inline void ftrace_init_trace_array(struct trace_array *tr) { }
733#endif
734#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
735extern int DYN_FTRACE_TEST_NAME(void);
736#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
737extern int DYN_FTRACE_TEST_NAME2(void);
738
739extern bool ring_buffer_expanded;
740extern bool tracing_selftest_disabled;
741
742#ifdef CONFIG_FTRACE_STARTUP_TEST
743extern void __init disable_tracing_selftest(const char *reason);
744
745extern int trace_selftest_startup_function(struct tracer *trace,
746 struct trace_array *tr);
747extern int trace_selftest_startup_function_graph(struct tracer *trace,
748 struct trace_array *tr);
749extern int trace_selftest_startup_irqsoff(struct tracer *trace,
750 struct trace_array *tr);
751extern int trace_selftest_startup_preemptoff(struct tracer *trace,
752 struct trace_array *tr);
753extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
754 struct trace_array *tr);
755extern int trace_selftest_startup_wakeup(struct tracer *trace,
756 struct trace_array *tr);
757extern int trace_selftest_startup_nop(struct tracer *trace,
758 struct trace_array *tr);
759extern int trace_selftest_startup_branch(struct tracer *trace,
760 struct trace_array *tr);
761/*
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.
765 */
766#define __tracer_data __refdata
767#else
768static inline void __init disable_tracing_selftest(const char *reason)
769{
770}
771/* Tracers are seldom changed. Optimize when selftests are disabled. */
772#define __tracer_data __read_mostly
773#endif /* CONFIG_FTRACE_STARTUP_TEST */
774
775extern void *head_page(struct trace_array_cpu *data);
776extern unsigned long long ns2usecs(u64 nsec);
777extern int
778trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
779extern int
780trace_vprintk(unsigned long ip, const char *fmt, va_list args);
781extern int
782trace_array_vprintk(struct trace_array *tr,
783 unsigned long ip, const char *fmt, va_list args);
784int trace_array_printk_buf(struct trace_buffer *buffer,
785 unsigned long ip, const char *fmt, ...);
786void trace_printk_seq(struct trace_seq *s);
787enum print_line_t print_trace_line(struct trace_iterator *iter);
788
789extern char trace_find_mark(unsigned long long duration);
790
791struct ftrace_hash;
792
793struct ftrace_mod_load {
794 struct list_head list;
795 char *func;
796 char *module;
797 int enable;
798};
799
800enum {
801 FTRACE_HASH_FL_MOD = (1 << 0),
802};
803
804struct ftrace_hash {
805 unsigned long size_bits;
806 struct hlist_head *buckets;
807 unsigned long count;
808 unsigned long flags;
809 struct rcu_head rcu;
810};
811
812struct ftrace_func_entry *
813ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
814
815static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
816{
817 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
818}
819
820/* Standard output formatting function used for function return traces */
821#ifdef CONFIG_FUNCTION_GRAPH_TRACER
822
823/* Flag options */
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)
837
838extern void ftrace_graph_sleep_time_control(bool enable);
839
840#ifdef CONFIG_FUNCTION_PROFILER
841extern void ftrace_graph_graph_time_control(bool enable);
842#else
843static inline void ftrace_graph_graph_time_control(bool enable) { }
844#endif
845
846extern enum print_line_t
847print_graph_function_flags(struct trace_iterator *iter, u32 flags);
848extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
849extern void
850trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
851extern void graph_trace_open(struct trace_iterator *iter);
852extern void graph_trace_close(struct trace_iterator *iter);
853extern int __trace_graph_entry(struct trace_array *tr,
854 struct ftrace_graph_ent *trace,
855 unsigned int trace_ctx);
856extern void __trace_graph_return(struct trace_array *tr,
857 struct ftrace_graph_ret *trace,
858 unsigned int trace_ctx);
859
860#ifdef CONFIG_DYNAMIC_FTRACE
861extern struct ftrace_hash __rcu *ftrace_graph_hash;
862extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
863
864static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
865{
866 unsigned long addr = trace->func;
867 int ret = 0;
868 struct ftrace_hash *hash;
869
870 preempt_disable_notrace();
871
872 /*
873 * Have to open code "rcu_dereference_sched()" because the
874 * function graph tracer can be called when RCU is not
875 * "watching".
876 * Protected with schedule_on_each_cpu(ftrace_sync)
877 */
878 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
879
880 if (ftrace_hash_empty(hash)) {
881 ret = 1;
882 goto out;
883 }
884
885 if (ftrace_lookup_ip(hash, addr)) {
886
887 /*
888 * This needs to be cleared on the return functions
889 * when the depth is zero.
890 */
891 trace_recursion_set(TRACE_GRAPH_BIT);
892 trace_recursion_set_depth(trace->depth);
893
894 /*
895 * If no irqs are to be traced, but a set_graph_function
896 * is set, and called by an interrupt handler, we still
897 * want to trace it.
898 */
899 if (in_hardirq())
900 trace_recursion_set(TRACE_IRQ_BIT);
901 else
902 trace_recursion_clear(TRACE_IRQ_BIT);
903 ret = 1;
904 }
905
906out:
907 preempt_enable_notrace();
908 return ret;
909}
910
911static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
912{
913 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
914 trace->depth == trace_recursion_depth())
915 trace_recursion_clear(TRACE_GRAPH_BIT);
916}
917
918static inline int ftrace_graph_notrace_addr(unsigned long addr)
919{
920 int ret = 0;
921 struct ftrace_hash *notrace_hash;
922
923 preempt_disable_notrace();
924
925 /*
926 * Have to open code "rcu_dereference_sched()" because the
927 * function graph tracer can be called when RCU is not
928 * "watching".
929 * Protected with schedule_on_each_cpu(ftrace_sync)
930 */
931 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
932 !preemptible());
933
934 if (ftrace_lookup_ip(notrace_hash, addr))
935 ret = 1;
936
937 preempt_enable_notrace();
938 return ret;
939}
940#else
941static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
942{
943 return 1;
944}
945
946static inline int ftrace_graph_notrace_addr(unsigned long addr)
947{
948 return 0;
949}
950static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
951{ }
952#endif /* CONFIG_DYNAMIC_FTRACE */
953
954extern unsigned int fgraph_max_depth;
955
956static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
957{
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);
963}
964
965#else /* CONFIG_FUNCTION_GRAPH_TRACER */
966static inline enum print_line_t
967print_graph_function_flags(struct trace_iterator *iter, u32 flags)
968{
969 return TRACE_TYPE_UNHANDLED;
970}
971#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
972
973extern struct list_head ftrace_pids;
974
975#ifdef CONFIG_FUNCTION_TRACER
976
977#define FTRACE_PID_IGNORE -1
978#define FTRACE_PID_TRACE -2
979
980struct ftrace_func_command {
981 struct list_head list;
982 char *name;
983 int (*func)(struct trace_array *tr,
984 struct ftrace_hash *hash,
985 char *func, char *cmd,
986 char *params, int enable);
987};
988extern bool ftrace_filter_param __initdata;
989static inline int ftrace_trace_task(struct trace_array *tr)
990{
991 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
992 FTRACE_PID_IGNORE;
993}
994extern int ftrace_is_dead(void);
995int ftrace_create_function_files(struct trace_array *tr,
996 struct dentry *parent);
997void ftrace_destroy_function_files(struct trace_array *tr);
998int ftrace_allocate_ftrace_ops(struct trace_array *tr);
999void ftrace_free_ftrace_ops(struct trace_array *tr);
1000void ftrace_init_global_array_ops(struct trace_array *tr);
1001void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1002void ftrace_reset_array_ops(struct trace_array *tr);
1003void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1004void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1005 struct dentry *d_tracer);
1006void ftrace_clear_pids(struct trace_array *tr);
1007int init_function_trace(void);
1008void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1009#else
1010static inline int ftrace_trace_task(struct trace_array *tr)
1011{
1012 return 1;
1013}
1014static inline int ftrace_is_dead(void) { return 0; }
1015static inline int
1016ftrace_create_function_files(struct trace_array *tr,
1017 struct dentry *parent)
1018{
1019 return 0;
1020}
1021static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1022{
1023 return 0;
1024}
1025static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1026static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1027static inline __init void
1028ftrace_init_global_array_ops(struct trace_array *tr) { }
1029static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1030static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1031static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1032static inline void ftrace_clear_pids(struct trace_array *tr) { }
1033static inline int init_function_trace(void) { return 0; }
1034static 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 */
1038
1039#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1040
1041struct 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,
1046 void *data);
1047 int (*init)(struct ftrace_probe_ops *ops,
1048 struct trace_array *tr,
1049 unsigned long ip, void *init_data,
1050 void **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,
1055 unsigned long ip,
1056 struct ftrace_probe_ops *ops,
1057 void *data);
1058};
1059
1060struct ftrace_func_mapper;
1061typedef int (*ftrace_mapper_func)(void *data);
1062
1063struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1064void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1065 unsigned long ip);
1066int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1067 unsigned long ip, void *data);
1068void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1069 unsigned long ip);
1070void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1071 ftrace_mapper_func free_func);
1072
1073extern int
1074register_ftrace_function_probe(char *glob, struct trace_array *tr,
1075 struct ftrace_probe_ops *ops, void *data);
1076extern int
1077unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1078 struct ftrace_probe_ops *ops);
1079extern void clear_ftrace_function_probes(struct trace_array *tr);
1080
1081int register_ftrace_command(struct ftrace_func_command *cmd);
1082int unregister_ftrace_command(struct ftrace_func_command *cmd);
1083
1084void ftrace_create_filter_files(struct ftrace_ops *ops,
1085 struct dentry *parent);
1086void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1087
1088extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1089 int len, int reset);
1090extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1091 int len, int reset);
1092#else
1093struct ftrace_func_command;
1094
1095static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1096{
1097 return -EINVAL;
1098}
1099static inline __init int unregister_ftrace_command(char *cmd_name)
1100{
1101 return -EINVAL;
1102}
1103static inline void clear_ftrace_function_probes(struct trace_array *tr)
1104{
1105}
1106
1107/*
1108 * The ops parameter passed in is usually undefined.
1109 * This must be a macro.
1110 */
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 */
1114
1115bool ftrace_event_is_function(struct trace_event_call *call);
1116
1117/*
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
1123 */
1124struct trace_parser {
1125 bool cont;
1126 char *buffer;
1127 unsigned idx;
1128 unsigned size;
1129};
1130
1131static inline bool trace_parser_loaded(struct trace_parser *parser)
1132{
1133 return (parser->idx != 0);
1134}
1135
1136static inline bool trace_parser_cont(struct trace_parser *parser)
1137{
1138 return parser->cont;
1139}
1140
1141static inline void trace_parser_clear(struct trace_parser *parser)
1142{
1143 parser->cont = false;
1144 parser->idx = 0;
1145}
1146
1147extern int trace_parser_get_init(struct trace_parser *parser, int size);
1148extern void trace_parser_put(struct trace_parser *parser);
1149extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1150 size_t cnt, loff_t *ppos);
1151
1152/*
1153 * Only create function graph options if function graph is configured.
1154 */
1155#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1156# define FGRAPH_FLAGS \
1157 C(DISPLAY_GRAPH, "display-graph"),
1158#else
1159# define FGRAPH_FLAGS
1160#endif
1161
1162#ifdef CONFIG_BRANCH_TRACER
1163# define BRANCH_FLAGS \
1164 C(BRANCH, "branch"),
1165#else
1166# define BRANCH_FLAGS
1167#endif
1168
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
1174#else
1175# define FUNCTION_FLAGS
1176# define FUNCTION_DEFAULT_FLAGS 0UL
1177# define TRACE_ITER_FUNC_FORK 0UL
1178#endif
1179
1180#ifdef CONFIG_STACKTRACE
1181# define STACK_FLAGS \
1182 C(STACKTRACE, "stacktrace"),
1183#else
1184# define STACK_FLAGS
1185#endif
1186
1187/*
1188 * trace_iterator_flags is an enumeration that defines bit
1189 * positions into trace_flags that controls the output.
1190 *
1191 * NOTE: These bits must match the trace_options array in
1192 * trace.c (this macro guarantees it).
1193 */
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"), \
1199 C(RAW, "raw"), \
1200 C(HEX, "hex"), \
1201 C(BIN, "bin"), \
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 */ \
1220 FUNCTION_FLAGS \
1221 FGRAPH_FLAGS \
1222 STACK_FLAGS \
1223 BRANCH_FLAGS
1224
1225/*
1226 * By defining C, we can make TRACE_FLAGS a list of bit names
1227 * that will define the bits for the flag masks.
1228 */
1229#undef C
1230#define C(a, b) TRACE_ITER_##a##_BIT
1231
1232enum trace_iterator_bits {
1233 TRACE_FLAGS
1234 /* Make sure we don't go more than we have bits for */
1235 TRACE_ITER_LAST_BIT
1236};
1237
1238/*
1239 * By redefining C, we can make TRACE_FLAGS a list of masks that
1240 * use the bits as defined above.
1241 */
1242#undef C
1243#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1244
1245enum trace_iterator_flags { TRACE_FLAGS };
1246
1247/*
1248 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1249 * control the output of kernel symbols.
1250 */
1251#define TRACE_ITER_SYM_MASK \
1252 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1253
1254extern struct tracer nop_trace;
1255
1256#ifdef CONFIG_BRANCH_TRACER
1257extern int enable_branch_tracing(struct trace_array *tr);
1258extern void disable_branch_tracing(void);
1259static inline int trace_branch_enable(struct trace_array *tr)
1260{
1261 if (tr->trace_flags & TRACE_ITER_BRANCH)
1262 return enable_branch_tracing(tr);
1263 return 0;
1264}
1265static inline void trace_branch_disable(void)
1266{
1267 /* due to races, always disable */
1268 disable_branch_tracing();
1269}
1270#else
1271static inline int trace_branch_enable(struct trace_array *tr)
1272{
1273 return 0;
1274}
1275static inline void trace_branch_disable(void)
1276{
1277}
1278#endif /* CONFIG_BRANCH_TRACER */
1279
1280/* set ring buffers to default size if not already done so */
1281int tracing_update_buffers(void);
1282
1283struct ftrace_event_field {
1284 struct list_head link;
1285 const char *name;
1286 const char *type;
1287 int filter_type;
1288 int offset;
1289 int size;
1290 int is_signed;
1291 int len;
1292};
1293
1294struct prog_entry;
1295
1296struct event_filter {
1297 struct prog_entry __rcu *prog;
1298 char *filter_string;
1299};
1300
1301struct event_subsystem {
1302 struct list_head list;
1303 const char *name;
1304 struct event_filter *filter;
1305 int ref_count;
1306};
1307
1308struct trace_subsystem_dir {
1309 struct list_head list;
1310 struct event_subsystem *subsystem;
1311 struct trace_array *tr;
1312 struct dentry *entry;
1313 int ref_count;
1314 int nr_events;
1315};
1316
1317extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1318 struct trace_buffer *buffer,
1319 struct ring_buffer_event *event);
1320
1321void 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);
1326
1327static 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)
1331{
1332 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1333}
1334
1335DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1336DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1337void trace_buffered_event_disable(void);
1338void trace_buffered_event_enable(void);
1339
1340void early_enable_events(struct trace_array *tr, char *buf, bool disable_first);
1341
1342static inline void
1343__trace_event_discard_commit(struct trace_buffer *buffer,
1344 struct ring_buffer_event *event)
1345{
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();
1350 return;
1351 }
1352 /* ring_buffer_discard_commit() enables preemption */
1353 ring_buffer_discard_commit(buffer, event);
1354}
1355
1356/*
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.
1361 *
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.
1366 *
1367 * Returns true if the event is discarded, false otherwise.
1368 */
1369static inline bool
1370__event_trigger_test_discard(struct trace_event_file *file,
1371 struct trace_buffer *buffer,
1372 struct ring_buffer_event *event,
1373 void *entry,
1374 enum event_trigger_type *tt)
1375{
1376 unsigned long eflags = file->flags;
1377
1378 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1379 *tt = event_triggers_call(file, buffer, entry, event);
1380
1381 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
1382 EVENT_FILE_FL_FILTERED |
1383 EVENT_FILE_FL_PID_FILTER))))
1384 return false;
1385
1386 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1387 goto discard;
1388
1389 if (file->flags & EVENT_FILE_FL_FILTERED &&
1390 !filter_match_preds(file->filter, entry))
1391 goto discard;
1392
1393 if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1394 trace_event_ignore_this_pid(file))
1395 goto discard;
1396
1397 return false;
1398 discard:
1399 __trace_event_discard_commit(buffer, event);
1400 return true;
1401}
1402
1403/**
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.
1410 *
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.
1414 */
1415static inline void
1416event_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)
1420{
1421 enum event_trigger_type tt = ETT_NONE;
1422
1423 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1424 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1425
1426 if (tt)
1427 event_triggers_post_call(file, tt);
1428}
1429
1430#define FILTER_PRED_INVALID ((unsigned short)-1)
1431#define FILTER_PRED_IS_RIGHT (1 << 15)
1432#define FILTER_PRED_FOLD (1 << 15)
1433
1434/*
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.
1438 *
1439 * 2^14 preds is way more than enough.
1440 */
1441#define MAX_FILTER_PRED 16384
1442
1443struct filter_pred;
1444struct regex;
1445
1446typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1447
1448enum regex_type {
1449 MATCH_FULL = 0,
1450 MATCH_FRONT_ONLY,
1451 MATCH_MIDDLE_ONLY,
1452 MATCH_END_ONLY,
1453 MATCH_GLOB,
1454 MATCH_INDEX,
1455};
1456
1457struct regex {
1458 char pattern[MAX_FILTER_STR_VAL];
1459 int len;
1460 int field_len;
1461 regex_match_func match;
1462};
1463
1464static inline bool is_string_field(struct ftrace_event_field *field)
1465{
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;
1471}
1472
1473static inline bool is_function_field(struct ftrace_event_field *field)
1474{
1475 return field->filter_type == FILTER_TRACE_FN;
1476}
1477
1478extern enum regex_type
1479filter_parse_regex(char *buff, int len, char **search, int *not);
1480extern void print_event_filter(struct trace_event_file *file,
1481 struct trace_seq *s);
1482extern int apply_event_filter(struct trace_event_file *file,
1483 char *filter_string);
1484extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1485 char *filter_string);
1486extern void print_subsystem_event_filter(struct event_subsystem *system,
1487 struct trace_seq *s);
1488extern int filter_assign_type(const char *type);
1489extern 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);
1493extern void free_event_filter(struct event_filter *filter);
1494
1495struct ftrace_event_field *
1496trace_find_event_field(struct trace_event_call *call, char *name);
1497
1498extern void trace_event_enable_cmd_record(bool enable);
1499extern void trace_event_enable_tgid_record(bool enable);
1500
1501extern int event_trace_init(void);
1502extern int init_events(void);
1503extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1504extern int event_trace_del_tracer(struct trace_array *tr);
1505extern void __trace_early_add_events(struct trace_array *tr);
1506
1507extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1508 const char *system,
1509 const char *event);
1510extern struct trace_event_file *find_event_file(struct trace_array *tr,
1511 const char *system,
1512 const char *event);
1513
1514static inline void *event_file_data(struct file *filp)
1515{
1516 return READ_ONCE(file_inode(filp)->i_private);
1517}
1518
1519extern struct mutex event_mutex;
1520extern struct list_head ftrace_events;
1521
1522extern const struct file_operations event_trigger_fops;
1523extern const struct file_operations event_hist_fops;
1524extern const struct file_operations event_hist_debug_fops;
1525extern const struct file_operations event_inject_fops;
1526
1527#ifdef CONFIG_HIST_TRIGGERS
1528extern int register_trigger_hist_cmd(void);
1529extern int register_trigger_hist_enable_disable_cmds(void);
1530#else
1531static inline int register_trigger_hist_cmd(void) { return 0; }
1532static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1533#endif
1534
1535extern int register_trigger_cmds(void);
1536extern void clear_event_triggers(struct trace_array *tr);
1537
1538enum {
1539 EVENT_TRIGGER_FL_PROBE = BIT(0),
1540};
1541
1542struct event_trigger_data {
1543 unsigned long count;
1544 int ref;
1545 int flags;
1546 struct event_trigger_ops *ops;
1547 struct event_command *cmd_ops;
1548 struct event_filter __rcu *filter;
1549 char *filter_str;
1550 void *private_data;
1551 bool paused;
1552 bool paused_tmp;
1553 struct list_head list;
1554 char *name;
1555 struct list_head named_list;
1556 struct event_trigger_data *named_data;
1557};
1558
1559/* Avoid typos */
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"
1564
1565struct enable_trigger_data {
1566 struct trace_event_file *file;
1567 bool enable;
1568 bool hist;
1569};
1570
1571extern int event_enable_trigger_print(struct seq_file *m,
1572 struct event_trigger_data *data);
1573extern void event_enable_trigger_free(struct event_trigger_data *data);
1574extern 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);
1578extern int event_enable_register_trigger(char *glob,
1579 struct event_trigger_data *data,
1580 struct trace_event_file *file);
1581extern void event_enable_unregister_trigger(char *glob,
1582 struct event_trigger_data *test,
1583 struct trace_event_file *file);
1584extern void trigger_data_free(struct event_trigger_data *data);
1585extern int event_trigger_init(struct event_trigger_data *data);
1586extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1587 int trigger_enable);
1588extern void update_cond_flag(struct trace_event_file *file);
1589extern int set_trigger_filter(char *filter_str,
1590 struct event_trigger_data *trigger_data,
1591 struct trace_event_file *file);
1592extern struct event_trigger_data *find_named_trigger(const char *name);
1593extern bool is_named_trigger(struct event_trigger_data *test);
1594extern int save_named_trigger(const char *name,
1595 struct event_trigger_data *data);
1596extern void del_named_trigger(struct event_trigger_data *data);
1597extern void pause_named_trigger(struct event_trigger_data *data);
1598extern void unpause_named_trigger(struct event_trigger_data *data);
1599extern void set_named_trigger_data(struct event_trigger_data *data,
1600 struct event_trigger_data *named_data);
1601extern struct event_trigger_data *
1602get_named_trigger_data(struct event_trigger_data *data);
1603extern int register_event_command(struct event_command *cmd);
1604extern int unregister_event_command(struct event_command *cmd);
1605extern int register_trigger_hist_enable_disable_cmds(void);
1606extern bool event_trigger_check_remove(const char *glob);
1607extern bool event_trigger_empty_param(const char *param);
1608extern int event_trigger_separate_filter(char *param_and_filter, char **param,
1609 char **filter, bool param_required);
1610extern struct event_trigger_data *
1611event_trigger_alloc(struct event_command *cmd_ops,
1612 char *cmd,
1613 char *param,
1614 void *private_data);
1615extern int event_trigger_parse_num(char *trigger,
1616 struct event_trigger_data *trigger_data);
1617extern int event_trigger_set_filter(struct event_command *cmd_ops,
1618 struct trace_event_file *file,
1619 char *param,
1620 struct event_trigger_data *trigger_data);
1621extern void event_trigger_reset_filter(struct event_command *cmd_ops,
1622 struct event_trigger_data *trigger_data);
1623extern int event_trigger_register(struct event_command *cmd_ops,
1624 struct trace_event_file *file,
1625 char *glob,
1626 struct event_trigger_data *trigger_data);
1627extern void event_trigger_unregister(struct event_command *cmd_ops,
1628 struct trace_event_file *file,
1629 char *glob,
1630 struct event_trigger_data *trigger_data);
1631
1632/**
1633 * struct event_trigger_ops - callbacks for trace event triggers
1634 *
1635 * The methods in this structure provide per-event trigger hooks for
1636 * various trigger operations.
1637 *
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.
1641 *
1642 * The @print method is used to print the trigger spec.
1643 *
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.
1647 *
1648 * All the methods below, except for @init() and @free(), must be
1649 * implemented.
1650 *
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.
1656 *
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).
1664 *
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).
1673 *
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).
1678 */
1679struct event_trigger_ops {
1680 void (*trigger)(struct event_trigger_data *data,
1681 struct trace_buffer *buffer,
1682 void *rec,
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);
1688};
1689
1690/**
1691 * struct event_command - callbacks and data members for event commands
1692 *
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.
1700 *
1701 * The data members in this structure provide per-event command data
1702 * for various event commands.
1703 *
1704 * All the data members below, except for @post_trigger, must be set
1705 * for each event command.
1706 *
1707 * @name: The unique name that identifies the event command. This is
1708 * the name used when setting triggers via trigger files.
1709 *
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.
1723 *
1724 * @flags: See the enum event_command_flags below.
1725 *
1726 * All the methods below, except for @set_filter() and @unreg_all(),
1727 * must be implemented.
1728 *
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).
1736 *
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).
1745 *
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).
1751 *
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.
1755 *
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).
1761 *
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
1767 * string.
1768 */
1769struct event_command {
1770 struct list_head list;
1771 char *name;
1772 enum event_trigger_type trigger_type;
1773 int flags;
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);
1789};
1790
1791/**
1792 * enum event_command_flags - flags for struct event_command
1793 *
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.
1812 *
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).
1818 */
1819enum event_command_flags {
1820 EVENT_CMD_FL_POST_TRIGGER = 1,
1821 EVENT_CMD_FL_NEEDS_REC = 2,
1822};
1823
1824static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1825{
1826 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1827}
1828
1829static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1830{
1831 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1832}
1833
1834extern int trace_event_enable_disable(struct trace_event_file *file,
1835 int enable, int soft_disable);
1836extern int tracing_alloc_snapshot(void);
1837extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1838extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1839
1840extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1841extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1842
1843extern const char *__start___trace_bprintk_fmt[];
1844extern const char *__stop___trace_bprintk_fmt[];
1845
1846extern const char *__start___tracepoint_str[];
1847extern const char *__stop___tracepoint_str[];
1848
1849void trace_printk_control(bool enabled);
1850void trace_printk_start_comm(void);
1851int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1852int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1853
1854/* Used from boot time tracer */
1855extern int trace_set_options(struct trace_array *tr, char *option);
1856extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1857extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1858 unsigned long size, int cpu_id);
1859extern int tracing_set_cpumask(struct trace_array *tr,
1860 cpumask_var_t tracing_cpumask_new);
1861
1862
1863#define MAX_EVENT_NAME_LEN 64
1864
1865extern 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 *));
1868
1869extern unsigned int err_pos(char *cmd, const char *str);
1870extern void tracing_log_err(struct trace_array *tr,
1871 const char *loc, const char *cmd,
1872 const char **errs, u8 type, u16 pos);
1873
1874/*
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
1881 * a purpose.
1882 */
1883#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1884
1885#undef FTRACE_ENTRY
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))
1895
1896#include "trace_entries.h"
1897
1898#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1899int perf_ftrace_event_register(struct trace_event_call *call,
1900 enum trace_reg type, void *data);
1901#else
1902#define perf_ftrace_event_register NULL
1903#endif
1904
1905#ifdef CONFIG_FTRACE_SYSCALLS
1906void init_ftrace_syscalls(void);
1907const char *get_syscall_name(int syscall);
1908#else
1909static inline void init_ftrace_syscalls(void) { }
1910static inline const char *get_syscall_name(int syscall)
1911{
1912 return NULL;
1913}
1914#endif
1915
1916#ifdef CONFIG_EVENT_TRACING
1917void trace_event_init(void);
1918void trace_event_eval_update(struct trace_eval_map **map, int len);
1919/* Used from boot time tracer */
1920extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1921extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1922#else
1923static inline void __init trace_event_init(void) { }
1924static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1925#endif
1926
1927#ifdef CONFIG_TRACER_SNAPSHOT
1928void tracing_snapshot_instance(struct trace_array *tr);
1929int tracing_alloc_snapshot_instance(struct trace_array *tr);
1930#else
1931static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1932static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1933{
1934 return 0;
1935}
1936#endif
1937
1938#ifdef CONFIG_PREEMPT_TRACER
1939void tracer_preempt_on(unsigned long a0, unsigned long a1);
1940void tracer_preempt_off(unsigned long a0, unsigned long a1);
1941#else
1942static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1943static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1944#endif
1945#ifdef CONFIG_IRQSOFF_TRACER
1946void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1947void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1948#else
1949static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1950static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1951#endif
1952
1953/*
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.
1957 */
1958static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1959{
1960 memset_startat(iter, 0, seq);
1961 iter->pos = -1;
1962}
1963
1964/* Check the name is good for event/group/fields */
1965static inline bool __is_good_name(const char *name, bool hash_ok)
1966{
1967 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-'))
1968 return false;
1969 while (*++name != '\0') {
1970 if (!isalpha(*name) && !isdigit(*name) && *name != '_' &&
1971 (!hash_ok || *name != '-'))
1972 return false;
1973 }
1974 return true;
1975}
1976
1977/* Check the name is good for event/group/fields */
1978static inline bool is_good_name(const char *name)
1979{
1980 return __is_good_name(name, false);
1981}
1982
1983/* Check the name is good for system */
1984static inline bool is_good_system_name(const char *name)
1985{
1986 return __is_good_name(name, true);
1987}
1988
1989/* Convert certain expected symbols into '_' when generating event names */
1990static inline void sanitize_event_name(char *name)
1991{
1992 while (*name++ != '\0')
1993 if (*name == ':' || *name == '.')
1994 *name = '_';
1995}
1996
1997/*
1998 * This is a generic way to read and write a u64 value from a file in tracefs.
1999 *
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
2002 * existing *lock.
2003 */
2004struct trace_min_max_param {
2005 struct mutex *lock;
2006 u64 *val;
2007 u64 *min;
2008 u64 *max;
2009};
2010
2011#define U64_STR_SIZE 24 /* 20 digits max */
2012
2013extern const struct file_operations trace_min_max_fops;
2014
2015#ifdef CONFIG_RV
2016extern int rv_init_interface(void);
2017#else
2018static inline int rv_init_interface(void)
2019{
2020 return 0;
2021}
2022#endif
2023
2024#endif /* _LINUX_KERNEL_TRACE_H */