projects/linux·blob v5.13 · 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
24#ifdef CONFIG_FTRACE_SYSCALLS
25#include <asm/unistd.h> /* For NR_SYSCALLS */
26#include <asm/syscall.h> /* some archs define it here */
27#endif
28
29enum trace_type {
30 __TRACE_FIRST_TYPE = 0,
31
32 TRACE_FN,
33 TRACE_CTX,
34 TRACE_WAKE,
35 TRACE_STACK,
36 TRACE_PRINT,
37 TRACE_BPRINT,
38 TRACE_MMIO_RW,
39 TRACE_MMIO_MAP,
40 TRACE_BRANCH,
41 TRACE_GRAPH_RET,
42 TRACE_GRAPH_ENT,
43 TRACE_USER_STACK,
44 TRACE_BLK,
45 TRACE_BPUTS,
46 TRACE_HWLAT,
47 TRACE_RAW_DATA,
48 TRACE_FUNC_REPEATS,
49
50 __TRACE_LAST_TYPE,
51};
52
53
54#undef __field
55#define __field(type, item) type item;
56
57#undef __field_fn
58#define __field_fn(type, item) type item;
59
60#undef __field_struct
61#define __field_struct(type, item) __field(type, item)
62
63#undef __field_desc
64#define __field_desc(type, container, item)
65
66#undef __field_packed
67#define __field_packed(type, container, item)
68
69#undef __array
70#define __array(type, item, size) type item[size];
71
72#undef __array_desc
73#define __array_desc(type, container, item, size)
74
75#undef __dynamic_array
76#define __dynamic_array(type, item) type item[];
77
78#undef F_STRUCT
79#define F_STRUCT(args...) args
80
81#undef FTRACE_ENTRY
82#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
83 struct struct_name { \
84 struct trace_entry ent; \
85 tstruct \
86 }
87
88#undef FTRACE_ENTRY_DUP
89#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
90
91#undef FTRACE_ENTRY_REG
92#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
93 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
94
95#undef FTRACE_ENTRY_PACKED
96#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
97 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
98
99#include "trace_entries.h"
100
101/* Use this for memory failure errors */
102#define MEM_FAIL(condition, fmt, ...) ({ \
103 static bool __section(".data.once") __warned; \
104 int __ret_warn_once = !!(condition); \
105 \
106 if (unlikely(__ret_warn_once && !__warned)) { \
107 __warned = true; \
108 pr_err("ERROR: " fmt, ##__VA_ARGS__); \
109 } \
110 unlikely(__ret_warn_once); \
111})
112
113/*
114 * syscalls are special, and need special handling, this is why
115 * they are not included in trace_entries.h
116 */
117struct syscall_trace_enter {
118 struct trace_entry ent;
119 int nr;
120 unsigned long args[];
121};
122
123struct syscall_trace_exit {
124 struct trace_entry ent;
125 int nr;
126 long ret;
127};
128
129struct kprobe_trace_entry_head {
130 struct trace_entry ent;
131 unsigned long ip;
132};
133
134struct kretprobe_trace_entry_head {
135 struct trace_entry ent;
136 unsigned long func;
137 unsigned long ret_ip;
138};
139
140#define TRACE_BUF_SIZE 1024
141
142struct trace_array;
143
144/*
145 * The CPU trace array - it consists of thousands of trace entries
146 * plus some other descriptor data: (for example which task started
147 * the trace, etc.)
148 */
149struct trace_array_cpu {
150 atomic_t disabled;
151 void *buffer_page; /* ring buffer spare */
152
153 unsigned long entries;
154 unsigned long saved_latency;
155 unsigned long critical_start;
156 unsigned long critical_end;
157 unsigned long critical_sequence;
158 unsigned long nice;
159 unsigned long policy;
160 unsigned long rt_priority;
161 unsigned long skipped_entries;
162 u64 preempt_timestamp;
163 pid_t pid;
164 kuid_t uid;
165 char comm[TASK_COMM_LEN];
166
167#ifdef CONFIG_FUNCTION_TRACER
168 int ftrace_ignore_pid;
169#endif
170 bool ignore_pid;
171};
172
173struct tracer;
174struct trace_option_dentry;
175
176struct array_buffer {
177 struct trace_array *tr;
178 struct trace_buffer *buffer;
179 struct trace_array_cpu __percpu *data;
180 u64 time_start;
181 int cpu;
182};
183
184#define TRACE_FLAGS_MAX_SIZE 32
185
186struct trace_options {
187 struct tracer *tracer;
188 struct trace_option_dentry *topts;
189};
190
191struct trace_pid_list {
192 int pid_max;
193 unsigned long *pids;
194};
195
196enum {
197 TRACE_PIDS = BIT(0),
198 TRACE_NO_PIDS = BIT(1),
199};
200
201static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
202 struct trace_pid_list *no_pid_list)
203{
204 /* Return true if the pid list in type has pids */
205 return ((type & TRACE_PIDS) && pid_list) ||
206 ((type & TRACE_NO_PIDS) && no_pid_list);
207}
208
209static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
210 struct trace_pid_list *no_pid_list)
211{
212 /*
213 * Turning off what is in @type, return true if the "other"
214 * pid list, still has pids in it.
215 */
216 return (!(type & TRACE_PIDS) && pid_list) ||
217 (!(type & TRACE_NO_PIDS) && no_pid_list);
218}
219
220typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
221
222/**
223 * struct cond_snapshot - conditional snapshot data and callback
224 *
225 * The cond_snapshot structure encapsulates a callback function and
226 * data associated with the snapshot for a given tracing instance.
227 *
228 * When a snapshot is taken conditionally, by invoking
229 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
230 * passed in turn to the cond_snapshot.update() function. That data
231 * can be compared by the update() implementation with the cond_data
232 * contained within the struct cond_snapshot instance associated with
233 * the trace_array. Because the tr->max_lock is held throughout the
234 * update() call, the update() function can directly retrieve the
235 * cond_snapshot and cond_data associated with the per-instance
236 * snapshot associated with the trace_array.
237 *
238 * The cond_snapshot.update() implementation can save data to be
239 * associated with the snapshot if it decides to, and returns 'true'
240 * in that case, or it returns 'false' if the conditional snapshot
241 * shouldn't be taken.
242 *
243 * The cond_snapshot instance is created and associated with the
244 * user-defined cond_data by tracing_cond_snapshot_enable().
245 * Likewise, the cond_snapshot instance is destroyed and is no longer
246 * associated with the trace instance by
247 * tracing_cond_snapshot_disable().
248 *
249 * The method below is required.
250 *
251 * @update: When a conditional snapshot is invoked, the update()
252 * callback function is invoked with the tr->max_lock held. The
253 * update() implementation signals whether or not to actually
254 * take the snapshot, by returning 'true' if so, 'false' if no
255 * snapshot should be taken. Because the max_lock is held for
256 * the duration of update(), the implementation is safe to
257 * directly retrieved and save any implementation data it needs
258 * to in association with the snapshot.
259 */
260struct cond_snapshot {
261 void *cond_data;
262 cond_update_fn_t update;
263};
264
265/*
266 * struct trace_func_repeats - used to keep track of the consecutive
267 * (on the same CPU) calls of a single function.
268 */
269struct trace_func_repeats {
270 unsigned long ip;
271 unsigned long parent_ip;
272 unsigned long count;
273 u64 ts_last_call;
274};
275
276/*
277 * The trace array - an array of per-CPU trace arrays. This is the
278 * highest level data structure that individual tracers deal with.
279 * They have on/off state as well:
280 */
281struct trace_array {
282 struct list_head list;
283 char *name;
284 struct array_buffer array_buffer;
285#ifdef CONFIG_TRACER_MAX_TRACE
286 /*
287 * The max_buffer is used to snapshot the trace when a maximum
288 * latency is reached, or when the user initiates a snapshot.
289 * Some tracers will use this to store a maximum trace while
290 * it continues examining live traces.
291 *
292 * The buffers for the max_buffer are set up the same as the array_buffer
293 * When a snapshot is taken, the buffer of the max_buffer is swapped
294 * with the buffer of the array_buffer and the buffers are reset for
295 * the array_buffer so the tracing can continue.
296 */
297 struct array_buffer max_buffer;
298 bool allocated_snapshot;
299#endif
300#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
301 unsigned long max_latency;
302#ifdef CONFIG_FSNOTIFY
303 struct dentry *d_max_latency;
304 struct work_struct fsnotify_work;
305 struct irq_work fsnotify_irqwork;
306#endif
307#endif
308 struct trace_pid_list __rcu *filtered_pids;
309 struct trace_pid_list __rcu *filtered_no_pids;
310 /*
311 * max_lock is used to protect the swapping of buffers
312 * when taking a max snapshot. The buffers themselves are
313 * protected by per_cpu spinlocks. But the action of the swap
314 * needs its own lock.
315 *
316 * This is defined as a arch_spinlock_t in order to help
317 * with performance when lockdep debugging is enabled.
318 *
319 * It is also used in other places outside the update_max_tr
320 * so it needs to be defined outside of the
321 * CONFIG_TRACER_MAX_TRACE.
322 */
323 arch_spinlock_t max_lock;
324 int buffer_disabled;
325#ifdef CONFIG_FTRACE_SYSCALLS
326 int sys_refcount_enter;
327 int sys_refcount_exit;
328 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
329 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
330#endif
331 int stop_count;
332 int clock_id;
333 int nr_topts;
334 bool clear_trace;
335 int buffer_percent;
336 unsigned int n_err_log_entries;
337 struct tracer *current_trace;
338 unsigned int trace_flags;
339 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
340 unsigned int flags;
341 raw_spinlock_t start_lock;
342 struct list_head err_log;
343 struct dentry *dir;
344 struct dentry *options;
345 struct dentry *percpu_dir;
346 struct dentry *event_dir;
347 struct trace_options *topts;
348 struct list_head systems;
349 struct list_head events;
350 struct trace_event_file *trace_marker_file;
351 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
352 int ref;
353 int trace_ref;
354#ifdef CONFIG_FUNCTION_TRACER
355 struct ftrace_ops *ops;
356 struct trace_pid_list __rcu *function_pids;
357 struct trace_pid_list __rcu *function_no_pids;
358#ifdef CONFIG_DYNAMIC_FTRACE
359 /* All of these are protected by the ftrace_lock */
360 struct list_head func_probes;
361 struct list_head mod_trace;
362 struct list_head mod_notrace;
363#endif
364 /* function tracing enabled */
365 int function_enabled;
366#endif
367 int no_filter_buffering_ref;
368 struct list_head hist_vars;
369#ifdef CONFIG_TRACER_SNAPSHOT
370 struct cond_snapshot *cond_snapshot;
371#endif
372 struct trace_func_repeats __percpu *last_func_repeats;
373};
374
375enum {
376 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
377};
378
379extern struct list_head ftrace_trace_arrays;
380
381extern struct mutex trace_types_lock;
382
383extern int trace_array_get(struct trace_array *tr);
384extern int tracing_check_open_get_tr(struct trace_array *tr);
385extern struct trace_array *trace_array_find(const char *instance);
386extern struct trace_array *trace_array_find_get(const char *instance);
387
388extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
389extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
390extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
391
392extern bool trace_clock_in_ns(struct trace_array *tr);
393
394/*
395 * The global tracer (top) should be the first trace array added,
396 * but we check the flag anyway.
397 */
398static inline struct trace_array *top_trace_array(void)
399{
400 struct trace_array *tr;
401
402 if (list_empty(&ftrace_trace_arrays))
403 return NULL;
404
405 tr = list_entry(ftrace_trace_arrays.prev,
406 typeof(*tr), list);
407 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
408 return tr;
409}
410
411#define FTRACE_CMP_TYPE(var, type) \
412 __builtin_types_compatible_p(typeof(var), type *)
413
414#undef IF_ASSIGN
415#define IF_ASSIGN(var, entry, etype, id) \
416 if (FTRACE_CMP_TYPE(var, etype)) { \
417 var = (typeof(var))(entry); \
418 WARN_ON(id != 0 && (entry)->type != id); \
419 break; \
420 }
421
422/* Will cause compile errors if type is not found. */
423extern void __ftrace_bad_type(void);
424
425/*
426 * The trace_assign_type is a verifier that the entry type is
427 * the same as the type being assigned. To add new types simply
428 * add a line with the following format:
429 *
430 * IF_ASSIGN(var, ent, type, id);
431 *
432 * Where "type" is the trace type that includes the trace_entry
433 * as the "ent" item. And "id" is the trace identifier that is
434 * used in the trace_type enum.
435 *
436 * If the type can have more than one id, then use zero.
437 */
438#define trace_assign_type(var, ent) \
439 do { \
440 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
441 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
442 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
443 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
444 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
445 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
446 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
447 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
448 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
449 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
450 TRACE_MMIO_RW); \
451 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
452 TRACE_MMIO_MAP); \
453 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
454 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
455 TRACE_GRAPH_ENT); \
456 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
457 TRACE_GRAPH_RET); \
458 IF_ASSIGN(var, ent, struct func_repeats_entry, \
459 TRACE_FUNC_REPEATS); \
460 __ftrace_bad_type(); \
461 } while (0)
462
463/*
464 * An option specific to a tracer. This is a boolean value.
465 * The bit is the bit index that sets its value on the
466 * flags value in struct tracer_flags.
467 */
468struct tracer_opt {
469 const char *name; /* Will appear on the trace_options file */
470 u32 bit; /* Mask assigned in val field in tracer_flags */
471};
472
473/*
474 * The set of specific options for a tracer. Your tracer
475 * have to set the initial value of the flags val.
476 */
477struct tracer_flags {
478 u32 val;
479 struct tracer_opt *opts;
480 struct tracer *trace;
481};
482
483/* Makes more easy to define a tracer opt */
484#define TRACER_OPT(s, b) .name = #s, .bit = b
485
486
487struct trace_option_dentry {
488 struct tracer_opt *opt;
489 struct tracer_flags *flags;
490 struct trace_array *tr;
491 struct dentry *entry;
492};
493
494/**
495 * struct tracer - a specific tracer and its callbacks to interact with tracefs
496 * @name: the name chosen to select it on the available_tracers file
497 * @init: called when one switches to this tracer (echo name > current_tracer)
498 * @reset: called when one switches to another tracer
499 * @start: called when tracing is unpaused (echo 1 > tracing_on)
500 * @stop: called when tracing is paused (echo 0 > tracing_on)
501 * @update_thresh: called when tracing_thresh is updated
502 * @open: called when the trace file is opened
503 * @pipe_open: called when the trace_pipe file is opened
504 * @close: called when the trace file is released
505 * @pipe_close: called when the trace_pipe file is released
506 * @read: override the default read callback on trace_pipe
507 * @splice_read: override the default splice_read callback on trace_pipe
508 * @selftest: selftest to run on boot (see trace_selftest.c)
509 * @print_headers: override the first lines that describe your columns
510 * @print_line: callback that prints a trace
511 * @set_flag: signals one of your private flags changed (trace_options file)
512 * @flags: your private flags
513 */
514struct tracer {
515 const char *name;
516 int (*init)(struct trace_array *tr);
517 void (*reset)(struct trace_array *tr);
518 void (*start)(struct trace_array *tr);
519 void (*stop)(struct trace_array *tr);
520 int (*update_thresh)(struct trace_array *tr);
521 void (*open)(struct trace_iterator *iter);
522 void (*pipe_open)(struct trace_iterator *iter);
523 void (*close)(struct trace_iterator *iter);
524 void (*pipe_close)(struct trace_iterator *iter);
525 ssize_t (*read)(struct trace_iterator *iter,
526 struct file *filp, char __user *ubuf,
527 size_t cnt, loff_t *ppos);
528 ssize_t (*splice_read)(struct trace_iterator *iter,
529 struct file *filp,
530 loff_t *ppos,
531 struct pipe_inode_info *pipe,
532 size_t len,
533 unsigned int flags);
534#ifdef CONFIG_FTRACE_STARTUP_TEST
535 int (*selftest)(struct tracer *trace,
536 struct trace_array *tr);
537#endif
538 void (*print_header)(struct seq_file *m);
539 enum print_line_t (*print_line)(struct trace_iterator *iter);
540 /* If you handled the flag setting, return 0 */
541 int (*set_flag)(struct trace_array *tr,
542 u32 old_flags, u32 bit, int set);
543 /* Return 0 if OK with change, else return non-zero */
544 int (*flag_changed)(struct trace_array *tr,
545 u32 mask, int set);
546 struct tracer *next;
547 struct tracer_flags *flags;
548 int enabled;
549 bool print_max;
550 bool allow_instances;
551#ifdef CONFIG_TRACER_MAX_TRACE
552 bool use_max_tr;
553#endif
554 /* True if tracer cannot be enabled in kernel param */
555 bool noboot;
556};
557
558static inline struct ring_buffer_iter *
559trace_buffer_iter(struct trace_iterator *iter, int cpu)
560{
561 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
562}
563
564int tracer_init(struct tracer *t, struct trace_array *tr);
565int tracing_is_enabled(void);
566void tracing_reset_online_cpus(struct array_buffer *buf);
567void tracing_reset_current(int cpu);
568void tracing_reset_all_online_cpus(void);
569int tracing_open_generic(struct inode *inode, struct file *filp);
570int tracing_open_generic_tr(struct inode *inode, struct file *filp);
571bool tracing_is_disabled(void);
572bool tracer_tracing_is_on(struct trace_array *tr);
573void tracer_tracing_on(struct trace_array *tr);
574void tracer_tracing_off(struct trace_array *tr);
575struct dentry *trace_create_file(const char *name,
576 umode_t mode,
577 struct dentry *parent,
578 void *data,
579 const struct file_operations *fops);
580
581int tracing_init_dentry(void);
582
583struct ring_buffer_event;
584
585struct ring_buffer_event *
586trace_buffer_lock_reserve(struct trace_buffer *buffer,
587 int type,
588 unsigned long len,
589 unsigned int trace_ctx);
590
591struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
592 struct trace_array_cpu *data);
593
594struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
595 int *ent_cpu, u64 *ent_ts);
596
597void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
598 struct ring_buffer_event *event);
599
600bool trace_is_tracepoint_string(const char *str);
601const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
602void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
603 va_list ap);
604
605int trace_empty(struct trace_iterator *iter);
606
607void *trace_find_next_entry_inc(struct trace_iterator *iter);
608
609void trace_init_global_iter(struct trace_iterator *iter);
610
611void tracing_iter_reset(struct trace_iterator *iter, int cpu);
612
613unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
614unsigned long trace_total_entries(struct trace_array *tr);
615
616void trace_function(struct trace_array *tr,
617 unsigned long ip,
618 unsigned long parent_ip,
619 unsigned int trace_ctx);
620void trace_graph_function(struct trace_array *tr,
621 unsigned long ip,
622 unsigned long parent_ip,
623 unsigned int trace_ctx);
624void trace_latency_header(struct seq_file *m);
625void trace_default_header(struct seq_file *m);
626void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
627
628void trace_graph_return(struct ftrace_graph_ret *trace);
629int trace_graph_entry(struct ftrace_graph_ent *trace);
630void set_graph_array(struct trace_array *tr);
631
632void tracing_start_cmdline_record(void);
633void tracing_stop_cmdline_record(void);
634void tracing_start_tgid_record(void);
635void tracing_stop_tgid_record(void);
636
637int register_tracer(struct tracer *type);
638int is_tracing_stopped(void);
639
640loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
641
642extern cpumask_var_t __read_mostly tracing_buffer_mask;
643
644#define for_each_tracing_cpu(cpu) \
645 for_each_cpu(cpu, tracing_buffer_mask)
646
647extern unsigned long nsecs_to_usecs(unsigned long nsecs);
648
649extern unsigned long tracing_thresh;
650
651/* PID filtering */
652
653extern int pid_max;
654
655bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
656 pid_t search_pid);
657bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
658 struct trace_pid_list *filtered_no_pids,
659 struct task_struct *task);
660void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
661 struct task_struct *self,
662 struct task_struct *task);
663void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
664void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
665int trace_pid_show(struct seq_file *m, void *v);
666void trace_free_pid_list(struct trace_pid_list *pid_list);
667int trace_pid_write(struct trace_pid_list *filtered_pids,
668 struct trace_pid_list **new_pid_list,
669 const char __user *ubuf, size_t cnt);
670
671#ifdef CONFIG_TRACER_MAX_TRACE
672void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
673 void *cond_data);
674void update_max_tr_single(struct trace_array *tr,
675 struct task_struct *tsk, int cpu);
676#endif /* CONFIG_TRACER_MAX_TRACE */
677
678#if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
679 defined(CONFIG_FSNOTIFY)
680
681void latency_fsnotify(struct trace_array *tr);
682
683#else
684
685static inline void latency_fsnotify(struct trace_array *tr) { }
686
687#endif
688
689#ifdef CONFIG_STACKTRACE
690void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
691#else
692static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
693 int skip)
694{
695}
696#endif /* CONFIG_STACKTRACE */
697
698void trace_last_func_repeats(struct trace_array *tr,
699 struct trace_func_repeats *last_info,
700 unsigned int trace_ctx);
701
702extern u64 ftrace_now(int cpu);
703
704extern void trace_find_cmdline(int pid, char comm[]);
705extern int trace_find_tgid(int pid);
706extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
707
708#ifdef CONFIG_DYNAMIC_FTRACE
709extern unsigned long ftrace_update_tot_cnt;
710extern unsigned long ftrace_number_of_pages;
711extern unsigned long ftrace_number_of_groups;
712void ftrace_init_trace_array(struct trace_array *tr);
713#else
714static inline void ftrace_init_trace_array(struct trace_array *tr) { }
715#endif
716#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
717extern int DYN_FTRACE_TEST_NAME(void);
718#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
719extern int DYN_FTRACE_TEST_NAME2(void);
720
721extern bool ring_buffer_expanded;
722extern bool tracing_selftest_disabled;
723
724#ifdef CONFIG_FTRACE_STARTUP_TEST
725extern void __init disable_tracing_selftest(const char *reason);
726
727extern int trace_selftest_startup_function(struct tracer *trace,
728 struct trace_array *tr);
729extern int trace_selftest_startup_function_graph(struct tracer *trace,
730 struct trace_array *tr);
731extern int trace_selftest_startup_irqsoff(struct tracer *trace,
732 struct trace_array *tr);
733extern int trace_selftest_startup_preemptoff(struct tracer *trace,
734 struct trace_array *tr);
735extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
736 struct trace_array *tr);
737extern int trace_selftest_startup_wakeup(struct tracer *trace,
738 struct trace_array *tr);
739extern int trace_selftest_startup_nop(struct tracer *trace,
740 struct trace_array *tr);
741extern int trace_selftest_startup_branch(struct tracer *trace,
742 struct trace_array *tr);
743/*
744 * Tracer data references selftest functions that only occur
745 * on boot up. These can be __init functions. Thus, when selftests
746 * are enabled, then the tracers need to reference __init functions.
747 */
748#define __tracer_data __refdata
749#else
750static inline void __init disable_tracing_selftest(const char *reason)
751{
752}
753/* Tracers are seldom changed. Optimize when selftests are disabled. */
754#define __tracer_data __read_mostly
755#endif /* CONFIG_FTRACE_STARTUP_TEST */
756
757extern void *head_page(struct trace_array_cpu *data);
758extern unsigned long long ns2usecs(u64 nsec);
759extern int
760trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
761extern int
762trace_vprintk(unsigned long ip, const char *fmt, va_list args);
763extern int
764trace_array_vprintk(struct trace_array *tr,
765 unsigned long ip, const char *fmt, va_list args);
766int trace_array_printk_buf(struct trace_buffer *buffer,
767 unsigned long ip, const char *fmt, ...);
768void trace_printk_seq(struct trace_seq *s);
769enum print_line_t print_trace_line(struct trace_iterator *iter);
770
771extern char trace_find_mark(unsigned long long duration);
772
773struct ftrace_hash;
774
775struct ftrace_mod_load {
776 struct list_head list;
777 char *func;
778 char *module;
779 int enable;
780};
781
782enum {
783 FTRACE_HASH_FL_MOD = (1 << 0),
784};
785
786struct ftrace_hash {
787 unsigned long size_bits;
788 struct hlist_head *buckets;
789 unsigned long count;
790 unsigned long flags;
791 struct rcu_head rcu;
792};
793
794struct ftrace_func_entry *
795ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
796
797static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
798{
799 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
800}
801
802/* Standard output formatting function used for function return traces */
803#ifdef CONFIG_FUNCTION_GRAPH_TRACER
804
805/* Flag options */
806#define TRACE_GRAPH_PRINT_OVERRUN 0x1
807#define TRACE_GRAPH_PRINT_CPU 0x2
808#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
809#define TRACE_GRAPH_PRINT_PROC 0x8
810#define TRACE_GRAPH_PRINT_DURATION 0x10
811#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
812#define TRACE_GRAPH_PRINT_REL_TIME 0x40
813#define TRACE_GRAPH_PRINT_IRQS 0x80
814#define TRACE_GRAPH_PRINT_TAIL 0x100
815#define TRACE_GRAPH_SLEEP_TIME 0x200
816#define TRACE_GRAPH_GRAPH_TIME 0x400
817#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
818#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
819
820extern void ftrace_graph_sleep_time_control(bool enable);
821
822#ifdef CONFIG_FUNCTION_PROFILER
823extern void ftrace_graph_graph_time_control(bool enable);
824#else
825static inline void ftrace_graph_graph_time_control(bool enable) { }
826#endif
827
828extern enum print_line_t
829print_graph_function_flags(struct trace_iterator *iter, u32 flags);
830extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
831extern void
832trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
833extern void graph_trace_open(struct trace_iterator *iter);
834extern void graph_trace_close(struct trace_iterator *iter);
835extern int __trace_graph_entry(struct trace_array *tr,
836 struct ftrace_graph_ent *trace,
837 unsigned int trace_ctx);
838extern void __trace_graph_return(struct trace_array *tr,
839 struct ftrace_graph_ret *trace,
840 unsigned int trace_ctx);
841
842#ifdef CONFIG_DYNAMIC_FTRACE
843extern struct ftrace_hash __rcu *ftrace_graph_hash;
844extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
845
846static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
847{
848 unsigned long addr = trace->func;
849 int ret = 0;
850 struct ftrace_hash *hash;
851
852 preempt_disable_notrace();
853
854 /*
855 * Have to open code "rcu_dereference_sched()" because the
856 * function graph tracer can be called when RCU is not
857 * "watching".
858 * Protected with schedule_on_each_cpu(ftrace_sync)
859 */
860 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
861
862 if (ftrace_hash_empty(hash)) {
863 ret = 1;
864 goto out;
865 }
866
867 if (ftrace_lookup_ip(hash, addr)) {
868
869 /*
870 * This needs to be cleared on the return functions
871 * when the depth is zero.
872 */
873 trace_recursion_set(TRACE_GRAPH_BIT);
874 trace_recursion_set_depth(trace->depth);
875
876 /*
877 * If no irqs are to be traced, but a set_graph_function
878 * is set, and called by an interrupt handler, we still
879 * want to trace it.
880 */
881 if (in_irq())
882 trace_recursion_set(TRACE_IRQ_BIT);
883 else
884 trace_recursion_clear(TRACE_IRQ_BIT);
885 ret = 1;
886 }
887
888out:
889 preempt_enable_notrace();
890 return ret;
891}
892
893static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
894{
895 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
896 trace->depth == trace_recursion_depth())
897 trace_recursion_clear(TRACE_GRAPH_BIT);
898}
899
900static inline int ftrace_graph_notrace_addr(unsigned long addr)
901{
902 int ret = 0;
903 struct ftrace_hash *notrace_hash;
904
905 preempt_disable_notrace();
906
907 /*
908 * Have to open code "rcu_dereference_sched()" because the
909 * function graph tracer can be called when RCU is not
910 * "watching".
911 * Protected with schedule_on_each_cpu(ftrace_sync)
912 */
913 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
914 !preemptible());
915
916 if (ftrace_lookup_ip(notrace_hash, addr))
917 ret = 1;
918
919 preempt_enable_notrace();
920 return ret;
921}
922#else
923static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
924{
925 return 1;
926}
927
928static inline int ftrace_graph_notrace_addr(unsigned long addr)
929{
930 return 0;
931}
932static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
933{ }
934#endif /* CONFIG_DYNAMIC_FTRACE */
935
936extern unsigned int fgraph_max_depth;
937
938static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
939{
940 /* trace it when it is-nested-in or is a function enabled. */
941 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
942 ftrace_graph_addr(trace)) ||
943 (trace->depth < 0) ||
944 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
945}
946
947#else /* CONFIG_FUNCTION_GRAPH_TRACER */
948static inline enum print_line_t
949print_graph_function_flags(struct trace_iterator *iter, u32 flags)
950{
951 return TRACE_TYPE_UNHANDLED;
952}
953#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
954
955extern struct list_head ftrace_pids;
956
957#ifdef CONFIG_FUNCTION_TRACER
958
959#define FTRACE_PID_IGNORE -1
960#define FTRACE_PID_TRACE -2
961
962struct ftrace_func_command {
963 struct list_head list;
964 char *name;
965 int (*func)(struct trace_array *tr,
966 struct ftrace_hash *hash,
967 char *func, char *cmd,
968 char *params, int enable);
969};
970extern bool ftrace_filter_param __initdata;
971static inline int ftrace_trace_task(struct trace_array *tr)
972{
973 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
974 FTRACE_PID_IGNORE;
975}
976extern int ftrace_is_dead(void);
977int ftrace_create_function_files(struct trace_array *tr,
978 struct dentry *parent);
979void ftrace_destroy_function_files(struct trace_array *tr);
980int ftrace_allocate_ftrace_ops(struct trace_array *tr);
981void ftrace_free_ftrace_ops(struct trace_array *tr);
982void ftrace_init_global_array_ops(struct trace_array *tr);
983void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
984void ftrace_reset_array_ops(struct trace_array *tr);
985void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
986void ftrace_init_tracefs_toplevel(struct trace_array *tr,
987 struct dentry *d_tracer);
988void ftrace_clear_pids(struct trace_array *tr);
989int init_function_trace(void);
990void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
991#else
992static inline int ftrace_trace_task(struct trace_array *tr)
993{
994 return 1;
995}
996static inline int ftrace_is_dead(void) { return 0; }
997static inline int
998ftrace_create_function_files(struct trace_array *tr,
999 struct dentry *parent)
1000{
1001 return 0;
1002}
1003static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1004{
1005 return 0;
1006}
1007static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1008static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1009static inline __init void
1010ftrace_init_global_array_ops(struct trace_array *tr) { }
1011static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1012static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1013static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1014static inline void ftrace_clear_pids(struct trace_array *tr) { }
1015static inline int init_function_trace(void) { return 0; }
1016static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1017/* ftace_func_t type is not defined, use macro instead of static inline */
1018#define ftrace_init_array_ops(tr, func) do { } while (0)
1019#endif /* CONFIG_FUNCTION_TRACER */
1020
1021#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1022
1023struct ftrace_probe_ops {
1024 void (*func)(unsigned long ip,
1025 unsigned long parent_ip,
1026 struct trace_array *tr,
1027 struct ftrace_probe_ops *ops,
1028 void *data);
1029 int (*init)(struct ftrace_probe_ops *ops,
1030 struct trace_array *tr,
1031 unsigned long ip, void *init_data,
1032 void **data);
1033 void (*free)(struct ftrace_probe_ops *ops,
1034 struct trace_array *tr,
1035 unsigned long ip, void *data);
1036 int (*print)(struct seq_file *m,
1037 unsigned long ip,
1038 struct ftrace_probe_ops *ops,
1039 void *data);
1040};
1041
1042struct ftrace_func_mapper;
1043typedef int (*ftrace_mapper_func)(void *data);
1044
1045struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1046void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1047 unsigned long ip);
1048int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1049 unsigned long ip, void *data);
1050void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1051 unsigned long ip);
1052void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1053 ftrace_mapper_func free_func);
1054
1055extern int
1056register_ftrace_function_probe(char *glob, struct trace_array *tr,
1057 struct ftrace_probe_ops *ops, void *data);
1058extern int
1059unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1060 struct ftrace_probe_ops *ops);
1061extern void clear_ftrace_function_probes(struct trace_array *tr);
1062
1063int register_ftrace_command(struct ftrace_func_command *cmd);
1064int unregister_ftrace_command(struct ftrace_func_command *cmd);
1065
1066void ftrace_create_filter_files(struct ftrace_ops *ops,
1067 struct dentry *parent);
1068void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1069
1070extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1071 int len, int reset);
1072extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1073 int len, int reset);
1074#else
1075struct ftrace_func_command;
1076
1077static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1078{
1079 return -EINVAL;
1080}
1081static inline __init int unregister_ftrace_command(char *cmd_name)
1082{
1083 return -EINVAL;
1084}
1085static inline void clear_ftrace_function_probes(struct trace_array *tr)
1086{
1087}
1088
1089/*
1090 * The ops parameter passed in is usually undefined.
1091 * This must be a macro.
1092 */
1093#define ftrace_create_filter_files(ops, parent) do { } while (0)
1094#define ftrace_destroy_filter_files(ops) do { } while (0)
1095#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1096
1097bool ftrace_event_is_function(struct trace_event_call *call);
1098
1099/*
1100 * struct trace_parser - servers for reading the user input separated by spaces
1101 * @cont: set if the input is not complete - no final space char was found
1102 * @buffer: holds the parsed user input
1103 * @idx: user input length
1104 * @size: buffer size
1105 */
1106struct trace_parser {
1107 bool cont;
1108 char *buffer;
1109 unsigned idx;
1110 unsigned size;
1111};
1112
1113static inline bool trace_parser_loaded(struct trace_parser *parser)
1114{
1115 return (parser->idx != 0);
1116}
1117
1118static inline bool trace_parser_cont(struct trace_parser *parser)
1119{
1120 return parser->cont;
1121}
1122
1123static inline void trace_parser_clear(struct trace_parser *parser)
1124{
1125 parser->cont = false;
1126 parser->idx = 0;
1127}
1128
1129extern int trace_parser_get_init(struct trace_parser *parser, int size);
1130extern void trace_parser_put(struct trace_parser *parser);
1131extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1132 size_t cnt, loff_t *ppos);
1133
1134/*
1135 * Only create function graph options if function graph is configured.
1136 */
1137#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1138# define FGRAPH_FLAGS \
1139 C(DISPLAY_GRAPH, "display-graph"),
1140#else
1141# define FGRAPH_FLAGS
1142#endif
1143
1144#ifdef CONFIG_BRANCH_TRACER
1145# define BRANCH_FLAGS \
1146 C(BRANCH, "branch"),
1147#else
1148# define BRANCH_FLAGS
1149#endif
1150
1151#ifdef CONFIG_FUNCTION_TRACER
1152# define FUNCTION_FLAGS \
1153 C(FUNCTION, "function-trace"), \
1154 C(FUNC_FORK, "function-fork"),
1155# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1156#else
1157# define FUNCTION_FLAGS
1158# define FUNCTION_DEFAULT_FLAGS 0UL
1159# define TRACE_ITER_FUNC_FORK 0UL
1160#endif
1161
1162#ifdef CONFIG_STACKTRACE
1163# define STACK_FLAGS \
1164 C(STACKTRACE, "stacktrace"),
1165#else
1166# define STACK_FLAGS
1167#endif
1168
1169/*
1170 * trace_iterator_flags is an enumeration that defines bit
1171 * positions into trace_flags that controls the output.
1172 *
1173 * NOTE: These bits must match the trace_options array in
1174 * trace.c (this macro guarantees it).
1175 */
1176#define TRACE_FLAGS \
1177 C(PRINT_PARENT, "print-parent"), \
1178 C(SYM_OFFSET, "sym-offset"), \
1179 C(SYM_ADDR, "sym-addr"), \
1180 C(VERBOSE, "verbose"), \
1181 C(RAW, "raw"), \
1182 C(HEX, "hex"), \
1183 C(BIN, "bin"), \
1184 C(BLOCK, "block"), \
1185 C(PRINTK, "trace_printk"), \
1186 C(ANNOTATE, "annotate"), \
1187 C(USERSTACKTRACE, "userstacktrace"), \
1188 C(SYM_USEROBJ, "sym-userobj"), \
1189 C(PRINTK_MSGONLY, "printk-msg-only"), \
1190 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1191 C(LATENCY_FMT, "latency-format"), \
1192 C(RECORD_CMD, "record-cmd"), \
1193 C(RECORD_TGID, "record-tgid"), \
1194 C(OVERWRITE, "overwrite"), \
1195 C(STOP_ON_FREE, "disable_on_free"), \
1196 C(IRQ_INFO, "irq-info"), \
1197 C(MARKERS, "markers"), \
1198 C(EVENT_FORK, "event-fork"), \
1199 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1200 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1201 FUNCTION_FLAGS \
1202 FGRAPH_FLAGS \
1203 STACK_FLAGS \
1204 BRANCH_FLAGS
1205
1206/*
1207 * By defining C, we can make TRACE_FLAGS a list of bit names
1208 * that will define the bits for the flag masks.
1209 */
1210#undef C
1211#define C(a, b) TRACE_ITER_##a##_BIT
1212
1213enum trace_iterator_bits {
1214 TRACE_FLAGS
1215 /* Make sure we don't go more than we have bits for */
1216 TRACE_ITER_LAST_BIT
1217};
1218
1219/*
1220 * By redefining C, we can make TRACE_FLAGS a list of masks that
1221 * use the bits as defined above.
1222 */
1223#undef C
1224#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1225
1226enum trace_iterator_flags { TRACE_FLAGS };
1227
1228/*
1229 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1230 * control the output of kernel symbols.
1231 */
1232#define TRACE_ITER_SYM_MASK \
1233 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1234
1235extern struct tracer nop_trace;
1236
1237#ifdef CONFIG_BRANCH_TRACER
1238extern int enable_branch_tracing(struct trace_array *tr);
1239extern void disable_branch_tracing(void);
1240static inline int trace_branch_enable(struct trace_array *tr)
1241{
1242 if (tr->trace_flags & TRACE_ITER_BRANCH)
1243 return enable_branch_tracing(tr);
1244 return 0;
1245}
1246static inline void trace_branch_disable(void)
1247{
1248 /* due to races, always disable */
1249 disable_branch_tracing();
1250}
1251#else
1252static inline int trace_branch_enable(struct trace_array *tr)
1253{
1254 return 0;
1255}
1256static inline void trace_branch_disable(void)
1257{
1258}
1259#endif /* CONFIG_BRANCH_TRACER */
1260
1261/* set ring buffers to default size if not already done so */
1262int tracing_update_buffers(void);
1263
1264struct ftrace_event_field {
1265 struct list_head link;
1266 const char *name;
1267 const char *type;
1268 int filter_type;
1269 int offset;
1270 int size;
1271 int is_signed;
1272};
1273
1274struct prog_entry;
1275
1276struct event_filter {
1277 struct prog_entry __rcu *prog;
1278 char *filter_string;
1279};
1280
1281struct event_subsystem {
1282 struct list_head list;
1283 const char *name;
1284 struct event_filter *filter;
1285 int ref_count;
1286};
1287
1288struct trace_subsystem_dir {
1289 struct list_head list;
1290 struct event_subsystem *subsystem;
1291 struct trace_array *tr;
1292 struct dentry *entry;
1293 int ref_count;
1294 int nr_events;
1295};
1296
1297extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1298 struct trace_buffer *buffer,
1299 struct ring_buffer_event *event);
1300
1301void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1302 struct trace_buffer *buffer,
1303 struct ring_buffer_event *event,
1304 unsigned int trcace_ctx,
1305 struct pt_regs *regs);
1306
1307static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1308 struct trace_buffer *buffer,
1309 struct ring_buffer_event *event,
1310 unsigned int trace_ctx)
1311{
1312 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1313}
1314
1315DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1316DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1317void trace_buffered_event_disable(void);
1318void trace_buffered_event_enable(void);
1319
1320static inline void
1321__trace_event_discard_commit(struct trace_buffer *buffer,
1322 struct ring_buffer_event *event)
1323{
1324 if (this_cpu_read(trace_buffered_event) == event) {
1325 /* Simply release the temp buffer */
1326 this_cpu_dec(trace_buffered_event_cnt);
1327 return;
1328 }
1329 ring_buffer_discard_commit(buffer, event);
1330}
1331
1332/*
1333 * Helper function for event_trigger_unlock_commit{_regs}().
1334 * If there are event triggers attached to this event that requires
1335 * filtering against its fields, then they will be called as the
1336 * entry already holds the field information of the current event.
1337 *
1338 * It also checks if the event should be discarded or not.
1339 * It is to be discarded if the event is soft disabled and the
1340 * event was only recorded to process triggers, or if the event
1341 * filter is active and this event did not match the filters.
1342 *
1343 * Returns true if the event is discarded, false otherwise.
1344 */
1345static inline bool
1346__event_trigger_test_discard(struct trace_event_file *file,
1347 struct trace_buffer *buffer,
1348 struct ring_buffer_event *event,
1349 void *entry,
1350 enum event_trigger_type *tt)
1351{
1352 unsigned long eflags = file->flags;
1353
1354 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1355 *tt = event_triggers_call(file, buffer, entry, event);
1356
1357 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1358 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1359 !filter_match_preds(file->filter, entry))) {
1360 __trace_event_discard_commit(buffer, event);
1361 return true;
1362 }
1363
1364 return false;
1365}
1366
1367/**
1368 * event_trigger_unlock_commit - handle triggers and finish event commit
1369 * @file: The file pointer associated with the event
1370 * @buffer: The ring buffer that the event is being written to
1371 * @event: The event meta data in the ring buffer
1372 * @entry: The event itself
1373 * @trace_ctx: The tracing context flags.
1374 *
1375 * This is a helper function to handle triggers that require data
1376 * from the event itself. It also tests the event against filters and
1377 * if the event is soft disabled and should be discarded.
1378 */
1379static inline void
1380event_trigger_unlock_commit(struct trace_event_file *file,
1381 struct trace_buffer *buffer,
1382 struct ring_buffer_event *event,
1383 void *entry, unsigned int trace_ctx)
1384{
1385 enum event_trigger_type tt = ETT_NONE;
1386
1387 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1388 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1389
1390 if (tt)
1391 event_triggers_post_call(file, tt);
1392}
1393
1394/**
1395 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1396 * @file: The file pointer associated with the event
1397 * @buffer: The ring buffer that the event is being written to
1398 * @event: The event meta data in the ring buffer
1399 * @entry: The event itself
1400 * @trace_ctx: The tracing context flags.
1401 *
1402 * This is a helper function to handle triggers that require data
1403 * from the event itself. It also tests the event against filters and
1404 * if the event is soft disabled and should be discarded.
1405 *
1406 * Same as event_trigger_unlock_commit() but calls
1407 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1408 */
1409static inline void
1410event_trigger_unlock_commit_regs(struct trace_event_file *file,
1411 struct trace_buffer *buffer,
1412 struct ring_buffer_event *event,
1413 void *entry, unsigned int trace_ctx,
1414 struct pt_regs *regs)
1415{
1416 enum event_trigger_type tt = ETT_NONE;
1417
1418 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1419 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1420 trace_ctx, regs);
1421
1422 if (tt)
1423 event_triggers_post_call(file, tt);
1424}
1425
1426#define FILTER_PRED_INVALID ((unsigned short)-1)
1427#define FILTER_PRED_IS_RIGHT (1 << 15)
1428#define FILTER_PRED_FOLD (1 << 15)
1429
1430/*
1431 * The max preds is the size of unsigned short with
1432 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1433 * and FOLD flags. The other is reserved.
1434 *
1435 * 2^14 preds is way more than enough.
1436 */
1437#define MAX_FILTER_PRED 16384
1438
1439struct filter_pred;
1440struct regex;
1441
1442typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1443
1444typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1445
1446enum regex_type {
1447 MATCH_FULL = 0,
1448 MATCH_FRONT_ONLY,
1449 MATCH_MIDDLE_ONLY,
1450 MATCH_END_ONLY,
1451 MATCH_GLOB,
1452 MATCH_INDEX,
1453};
1454
1455struct regex {
1456 char pattern[MAX_FILTER_STR_VAL];
1457 int len;
1458 int field_len;
1459 regex_match_func match;
1460};
1461
1462struct filter_pred {
1463 filter_pred_fn_t fn;
1464 u64 val;
1465 struct regex regex;
1466 unsigned short *ops;
1467 struct ftrace_event_field *field;
1468 int offset;
1469 int not;
1470 int op;
1471};
1472
1473static inline bool is_string_field(struct ftrace_event_field *field)
1474{
1475 return field->filter_type == FILTER_DYN_STRING ||
1476 field->filter_type == FILTER_STATIC_STRING ||
1477 field->filter_type == FILTER_PTR_STRING ||
1478 field->filter_type == FILTER_COMM;
1479}
1480
1481static inline bool is_function_field(struct ftrace_event_field *field)
1482{
1483 return field->filter_type == FILTER_TRACE_FN;
1484}
1485
1486extern enum regex_type
1487filter_parse_regex(char *buff, int len, char **search, int *not);
1488extern void print_event_filter(struct trace_event_file *file,
1489 struct trace_seq *s);
1490extern int apply_event_filter(struct trace_event_file *file,
1491 char *filter_string);
1492extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1493 char *filter_string);
1494extern void print_subsystem_event_filter(struct event_subsystem *system,
1495 struct trace_seq *s);
1496extern int filter_assign_type(const char *type);
1497extern int create_event_filter(struct trace_array *tr,
1498 struct trace_event_call *call,
1499 char *filter_str, bool set_str,
1500 struct event_filter **filterp);
1501extern void free_event_filter(struct event_filter *filter);
1502
1503struct ftrace_event_field *
1504trace_find_event_field(struct trace_event_call *call, char *name);
1505
1506extern void trace_event_enable_cmd_record(bool enable);
1507extern void trace_event_enable_tgid_record(bool enable);
1508
1509extern int event_trace_init(void);
1510extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1511extern int event_trace_del_tracer(struct trace_array *tr);
1512extern void __trace_early_add_events(struct trace_array *tr);
1513
1514extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1515 const char *system,
1516 const char *event);
1517extern struct trace_event_file *find_event_file(struct trace_array *tr,
1518 const char *system,
1519 const char *event);
1520
1521static inline void *event_file_data(struct file *filp)
1522{
1523 return READ_ONCE(file_inode(filp)->i_private);
1524}
1525
1526extern struct mutex event_mutex;
1527extern struct list_head ftrace_events;
1528
1529extern const struct file_operations event_trigger_fops;
1530extern const struct file_operations event_hist_fops;
1531extern const struct file_operations event_hist_debug_fops;
1532extern const struct file_operations event_inject_fops;
1533
1534#ifdef CONFIG_HIST_TRIGGERS
1535extern int register_trigger_hist_cmd(void);
1536extern int register_trigger_hist_enable_disable_cmds(void);
1537#else
1538static inline int register_trigger_hist_cmd(void) { return 0; }
1539static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1540#endif
1541
1542extern int register_trigger_cmds(void);
1543extern void clear_event_triggers(struct trace_array *tr);
1544
1545struct event_trigger_data {
1546 unsigned long count;
1547 int ref;
1548 struct event_trigger_ops *ops;
1549 struct event_command *cmd_ops;
1550 struct event_filter __rcu *filter;
1551 char *filter_str;
1552 void *private_data;
1553 bool paused;
1554 bool paused_tmp;
1555 struct list_head list;
1556 char *name;
1557 struct list_head named_list;
1558 struct event_trigger_data *named_data;
1559};
1560
1561/* Avoid typos */
1562#define ENABLE_EVENT_STR "enable_event"
1563#define DISABLE_EVENT_STR "disable_event"
1564#define ENABLE_HIST_STR "enable_hist"
1565#define DISABLE_HIST_STR "disable_hist"
1566
1567struct enable_trigger_data {
1568 struct trace_event_file *file;
1569 bool enable;
1570 bool hist;
1571};
1572
1573extern int event_enable_trigger_print(struct seq_file *m,
1574 struct event_trigger_ops *ops,
1575 struct event_trigger_data *data);
1576extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1577 struct event_trigger_data *data);
1578extern int event_enable_trigger_func(struct event_command *cmd_ops,
1579 struct trace_event_file *file,
1580 char *glob, char *cmd, char *param);
1581extern int event_enable_register_trigger(char *glob,
1582 struct event_trigger_ops *ops,
1583 struct event_trigger_data *data,
1584 struct trace_event_file *file);
1585extern void event_enable_unregister_trigger(char *glob,
1586 struct event_trigger_ops *ops,
1587 struct event_trigger_data *test,
1588 struct trace_event_file *file);
1589extern void trigger_data_free(struct event_trigger_data *data);
1590extern int event_trigger_init(struct event_trigger_ops *ops,
1591 struct event_trigger_data *data);
1592extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1593 int trigger_enable);
1594extern void update_cond_flag(struct trace_event_file *file);
1595extern int set_trigger_filter(char *filter_str,
1596 struct event_trigger_data *trigger_data,
1597 struct trace_event_file *file);
1598extern struct event_trigger_data *find_named_trigger(const char *name);
1599extern bool is_named_trigger(struct event_trigger_data *test);
1600extern int save_named_trigger(const char *name,
1601 struct event_trigger_data *data);
1602extern void del_named_trigger(struct event_trigger_data *data);
1603extern void pause_named_trigger(struct event_trigger_data *data);
1604extern void unpause_named_trigger(struct event_trigger_data *data);
1605extern void set_named_trigger_data(struct event_trigger_data *data,
1606 struct event_trigger_data *named_data);
1607extern struct event_trigger_data *
1608get_named_trigger_data(struct event_trigger_data *data);
1609extern int register_event_command(struct event_command *cmd);
1610extern int unregister_event_command(struct event_command *cmd);
1611extern int register_trigger_hist_enable_disable_cmds(void);
1612
1613/**
1614 * struct event_trigger_ops - callbacks for trace event triggers
1615 *
1616 * The methods in this structure provide per-event trigger hooks for
1617 * various trigger operations.
1618 *
1619 * All the methods below, except for @init() and @free(), must be
1620 * implemented.
1621 *
1622 * @func: The trigger 'probe' function called when the triggering
1623 * event occurs. The data passed into this callback is the data
1624 * that was supplied to the event_command @reg() function that
1625 * registered the trigger (see struct event_command) along with
1626 * the trace record, rec.
1627 *
1628 * @init: An optional initialization function called for the trigger
1629 * when the trigger is registered (via the event_command reg()
1630 * function). This can be used to perform per-trigger
1631 * initialization such as incrementing a per-trigger reference
1632 * count, for instance. This is usually implemented by the
1633 * generic utility function @event_trigger_init() (see
1634 * trace_event_triggers.c).
1635 *
1636 * @free: An optional de-initialization function called for the
1637 * trigger when the trigger is unregistered (via the
1638 * event_command @reg() function). This can be used to perform
1639 * per-trigger de-initialization such as decrementing a
1640 * per-trigger reference count and freeing corresponding trigger
1641 * data, for instance. This is usually implemented by the
1642 * generic utility function @event_trigger_free() (see
1643 * trace_event_triggers.c).
1644 *
1645 * @print: The callback function invoked to have the trigger print
1646 * itself. This is usually implemented by a wrapper function
1647 * that calls the generic utility function @event_trigger_print()
1648 * (see trace_event_triggers.c).
1649 */
1650struct event_trigger_ops {
1651 void (*func)(struct event_trigger_data *data,
1652 struct trace_buffer *buffer, void *rec,
1653 struct ring_buffer_event *rbe);
1654 int (*init)(struct event_trigger_ops *ops,
1655 struct event_trigger_data *data);
1656 void (*free)(struct event_trigger_ops *ops,
1657 struct event_trigger_data *data);
1658 int (*print)(struct seq_file *m,
1659 struct event_trigger_ops *ops,
1660 struct event_trigger_data *data);
1661};
1662
1663/**
1664 * struct event_command - callbacks and data members for event commands
1665 *
1666 * Event commands are invoked by users by writing the command name
1667 * into the 'trigger' file associated with a trace event. The
1668 * parameters associated with a specific invocation of an event
1669 * command are used to create an event trigger instance, which is
1670 * added to the list of trigger instances associated with that trace
1671 * event. When the event is hit, the set of triggers associated with
1672 * that event is invoked.
1673 *
1674 * The data members in this structure provide per-event command data
1675 * for various event commands.
1676 *
1677 * All the data members below, except for @post_trigger, must be set
1678 * for each event command.
1679 *
1680 * @name: The unique name that identifies the event command. This is
1681 * the name used when setting triggers via trigger files.
1682 *
1683 * @trigger_type: A unique id that identifies the event command
1684 * 'type'. This value has two purposes, the first to ensure that
1685 * only one trigger of the same type can be set at a given time
1686 * for a particular event e.g. it doesn't make sense to have both
1687 * a traceon and traceoff trigger attached to a single event at
1688 * the same time, so traceon and traceoff have the same type
1689 * though they have different names. The @trigger_type value is
1690 * also used as a bit value for deferring the actual trigger
1691 * action until after the current event is finished. Some
1692 * commands need to do this if they themselves log to the trace
1693 * buffer (see the @post_trigger() member below). @trigger_type
1694 * values are defined by adding new values to the trigger_type
1695 * enum in include/linux/trace_events.h.
1696 *
1697 * @flags: See the enum event_command_flags below.
1698 *
1699 * All the methods below, except for @set_filter() and @unreg_all(),
1700 * must be implemented.
1701 *
1702 * @func: The callback function responsible for parsing and
1703 * registering the trigger written to the 'trigger' file by the
1704 * user. It allocates the trigger instance and registers it with
1705 * the appropriate trace event. It makes use of the other
1706 * event_command callback functions to orchestrate this, and is
1707 * usually implemented by the generic utility function
1708 * @event_trigger_callback() (see trace_event_triggers.c).
1709 *
1710 * @reg: Adds the trigger to the list of triggers associated with the
1711 * event, and enables the event trigger itself, after
1712 * initializing it (via the event_trigger_ops @init() function).
1713 * This is also where commands can use the @trigger_type value to
1714 * make the decision as to whether or not multiple instances of
1715 * the trigger should be allowed. This is usually implemented by
1716 * the generic utility function @register_trigger() (see
1717 * trace_event_triggers.c).
1718 *
1719 * @unreg: Removes the trigger from the list of triggers associated
1720 * with the event, and disables the event trigger itself, after
1721 * initializing it (via the event_trigger_ops @free() function).
1722 * This is usually implemented by the generic utility function
1723 * @unregister_trigger() (see trace_event_triggers.c).
1724 *
1725 * @unreg_all: An optional function called to remove all the triggers
1726 * from the list of triggers associated with the event. Called
1727 * when a trigger file is opened in truncate mode.
1728 *
1729 * @set_filter: An optional function called to parse and set a filter
1730 * for the trigger. If no @set_filter() method is set for the
1731 * event command, filters set by the user for the command will be
1732 * ignored. This is usually implemented by the generic utility
1733 * function @set_trigger_filter() (see trace_event_triggers.c).
1734 *
1735 * @get_trigger_ops: The callback function invoked to retrieve the
1736 * event_trigger_ops implementation associated with the command.
1737 */
1738struct event_command {
1739 struct list_head list;
1740 char *name;
1741 enum event_trigger_type trigger_type;
1742 int flags;
1743 int (*func)(struct event_command *cmd_ops,
1744 struct trace_event_file *file,
1745 char *glob, char *cmd, char *params);
1746 int (*reg)(char *glob,
1747 struct event_trigger_ops *ops,
1748 struct event_trigger_data *data,
1749 struct trace_event_file *file);
1750 void (*unreg)(char *glob,
1751 struct event_trigger_ops *ops,
1752 struct event_trigger_data *data,
1753 struct trace_event_file *file);
1754 void (*unreg_all)(struct trace_event_file *file);
1755 int (*set_filter)(char *filter_str,
1756 struct event_trigger_data *data,
1757 struct trace_event_file *file);
1758 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1759};
1760
1761/**
1762 * enum event_command_flags - flags for struct event_command
1763 *
1764 * @POST_TRIGGER: A flag that says whether or not this command needs
1765 * to have its action delayed until after the current event has
1766 * been closed. Some triggers need to avoid being invoked while
1767 * an event is currently in the process of being logged, since
1768 * the trigger may itself log data into the trace buffer. Thus
1769 * we make sure the current event is committed before invoking
1770 * those triggers. To do that, the trigger invocation is split
1771 * in two - the first part checks the filter using the current
1772 * trace record; if a command has the @post_trigger flag set, it
1773 * sets a bit for itself in the return value, otherwise it
1774 * directly invokes the trigger. Once all commands have been
1775 * either invoked or set their return flag, the current record is
1776 * either committed or discarded. At that point, if any commands
1777 * have deferred their triggers, those commands are finally
1778 * invoked following the close of the current event. In other
1779 * words, if the event_trigger_ops @func() probe implementation
1780 * itself logs to the trace buffer, this flag should be set,
1781 * otherwise it can be left unspecified.
1782 *
1783 * @NEEDS_REC: A flag that says whether or not this command needs
1784 * access to the trace record in order to perform its function,
1785 * regardless of whether or not it has a filter associated with
1786 * it (filters make a trigger require access to the trace record
1787 * but are not always present).
1788 */
1789enum event_command_flags {
1790 EVENT_CMD_FL_POST_TRIGGER = 1,
1791 EVENT_CMD_FL_NEEDS_REC = 2,
1792};
1793
1794static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1795{
1796 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1797}
1798
1799static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1800{
1801 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1802}
1803
1804extern int trace_event_enable_disable(struct trace_event_file *file,
1805 int enable, int soft_disable);
1806extern int tracing_alloc_snapshot(void);
1807extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1808extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1809
1810extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1811extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1812
1813extern const char *__start___trace_bprintk_fmt[];
1814extern const char *__stop___trace_bprintk_fmt[];
1815
1816extern const char *__start___tracepoint_str[];
1817extern const char *__stop___tracepoint_str[];
1818
1819void trace_printk_control(bool enabled);
1820void trace_printk_start_comm(void);
1821int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1822int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1823
1824/* Used from boot time tracer */
1825extern int trace_set_options(struct trace_array *tr, char *option);
1826extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1827extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1828 unsigned long size, int cpu_id);
1829extern int tracing_set_cpumask(struct trace_array *tr,
1830 cpumask_var_t tracing_cpumask_new);
1831
1832
1833#define MAX_EVENT_NAME_LEN 64
1834
1835extern ssize_t trace_parse_run_command(struct file *file,
1836 const char __user *buffer, size_t count, loff_t *ppos,
1837 int (*createfn)(const char *));
1838
1839extern unsigned int err_pos(char *cmd, const char *str);
1840extern void tracing_log_err(struct trace_array *tr,
1841 const char *loc, const char *cmd,
1842 const char **errs, u8 type, u8 pos);
1843
1844/*
1845 * Normal trace_printk() and friends allocates special buffers
1846 * to do the manipulation, as well as saves the print formats
1847 * into sections to display. But the trace infrastructure wants
1848 * to use these without the added overhead at the price of being
1849 * a bit slower (used mainly for warnings, where we don't care
1850 * about performance). The internal_trace_puts() is for such
1851 * a purpose.
1852 */
1853#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1854
1855#undef FTRACE_ENTRY
1856#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1857 extern struct trace_event_call \
1858 __aligned(4) event_##call;
1859#undef FTRACE_ENTRY_DUP
1860#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1861 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1862#undef FTRACE_ENTRY_PACKED
1863#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1864 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1865
1866#include "trace_entries.h"
1867
1868#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1869int perf_ftrace_event_register(struct trace_event_call *call,
1870 enum trace_reg type, void *data);
1871#else
1872#define perf_ftrace_event_register NULL
1873#endif
1874
1875#ifdef CONFIG_FTRACE_SYSCALLS
1876void init_ftrace_syscalls(void);
1877const char *get_syscall_name(int syscall);
1878#else
1879static inline void init_ftrace_syscalls(void) { }
1880static inline const char *get_syscall_name(int syscall)
1881{
1882 return NULL;
1883}
1884#endif
1885
1886#ifdef CONFIG_EVENT_TRACING
1887void trace_event_init(void);
1888void trace_event_eval_update(struct trace_eval_map **map, int len);
1889/* Used from boot time tracer */
1890extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1891extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1892#else
1893static inline void __init trace_event_init(void) { }
1894static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1895#endif
1896
1897#ifdef CONFIG_TRACER_SNAPSHOT
1898void tracing_snapshot_instance(struct trace_array *tr);
1899int tracing_alloc_snapshot_instance(struct trace_array *tr);
1900#else
1901static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1902static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1903{
1904 return 0;
1905}
1906#endif
1907
1908#ifdef CONFIG_PREEMPT_TRACER
1909void tracer_preempt_on(unsigned long a0, unsigned long a1);
1910void tracer_preempt_off(unsigned long a0, unsigned long a1);
1911#else
1912static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1913static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1914#endif
1915#ifdef CONFIG_IRQSOFF_TRACER
1916void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1917void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1918#else
1919static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1920static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1921#endif
1922
1923extern struct trace_iterator *tracepoint_print_iter;
1924
1925/*
1926 * Reset the state of the trace_iterator so that it can read consumed data.
1927 * Normally, the trace_iterator is used for reading the data when it is not
1928 * consumed, and must retain state.
1929 */
1930static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1931{
1932 const size_t offset = offsetof(struct trace_iterator, seq);
1933
1934 /*
1935 * Keep gcc from complaining about overwriting more than just one
1936 * member in the structure.
1937 */
1938 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1939
1940 iter->pos = -1;
1941}
1942
1943/* Check the name is good for event/group/fields */
1944static inline bool is_good_name(const char *name)
1945{
1946 if (!isalpha(*name) && *name != '_')
1947 return false;
1948 while (*++name != '\0') {
1949 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1950 return false;
1951 }
1952 return true;
1953}
1954
1955#endif /* _LINUX_KERNEL_TRACE_H */