projects/linux·blob v6.6 · 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/*
81 * For backward compatibility, older user space expects to see the
82 * kernel_stack event with a fixed size caller field. But today the fix
83 * size is ignored by the kernel, and the real structure is dynamic.
84 * Expose to user space: "unsigned long caller[8];" but the real structure
85 * will be "unsigned long caller[] __counted_by(size)"
86 */
87#undef __stack_array
88#define __stack_array(type, item, size, field) type item[] __counted_by(field);
89
90#undef __array_desc
91#define __array_desc(type, container, item, size)
92
93#undef __dynamic_array
94#define __dynamic_array(type, item) type item[];
95
96#undef __rel_dynamic_array
97#define __rel_dynamic_array(type, item) type item[];
98
99#undef F_STRUCT
100#define F_STRUCT(args...) args
101
102#undef FTRACE_ENTRY
103#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
104 struct struct_name { \
105 struct trace_entry ent; \
106 tstruct \
107 }
108
109#undef FTRACE_ENTRY_DUP
110#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
111
112#undef FTRACE_ENTRY_REG
113#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
114 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
115
116#undef FTRACE_ENTRY_PACKED
117#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
118 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
119
120#include "trace_entries.h"
121
122/* Use this for memory failure errors */
123#define MEM_FAIL(condition, fmt, ...) \
124 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__)
125
126#define FAULT_STRING "(fault)"
127
128#define HIST_STACKTRACE_DEPTH 16
129#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
130#define HIST_STACKTRACE_SKIP 5
131
132/*
133 * syscalls are special, and need special handling, this is why
134 * they are not included in trace_entries.h
135 */
136struct syscall_trace_enter {
137 struct trace_entry ent;
138 int nr;
139 unsigned long args[];
140};
141
142struct syscall_trace_exit {
143 struct trace_entry ent;
144 int nr;
145 long ret;
146};
147
148struct kprobe_trace_entry_head {
149 struct trace_entry ent;
150 unsigned long ip;
151};
152
153struct eprobe_trace_entry_head {
154 struct trace_entry ent;
155};
156
157struct kretprobe_trace_entry_head {
158 struct trace_entry ent;
159 unsigned long func;
160 unsigned long ret_ip;
161};
162
163struct fentry_trace_entry_head {
164 struct trace_entry ent;
165 unsigned long ip;
166};
167
168struct fexit_trace_entry_head {
169 struct trace_entry ent;
170 unsigned long func;
171 unsigned long ret_ip;
172};
173
174#define TRACE_BUF_SIZE 1024
175
176struct trace_array;
177
178/*
179 * The CPU trace array - it consists of thousands of trace entries
180 * plus some other descriptor data: (for example which task started
181 * the trace, etc.)
182 */
183struct trace_array_cpu {
184 atomic_t disabled;
185 void *buffer_page; /* ring buffer spare */
186
187 unsigned long entries;
188 unsigned long saved_latency;
189 unsigned long critical_start;
190 unsigned long critical_end;
191 unsigned long critical_sequence;
192 unsigned long nice;
193 unsigned long policy;
194 unsigned long rt_priority;
195 unsigned long skipped_entries;
196 u64 preempt_timestamp;
197 pid_t pid;
198 kuid_t uid;
199 char comm[TASK_COMM_LEN];
200
201#ifdef CONFIG_FUNCTION_TRACER
202 int ftrace_ignore_pid;
203#endif
204 bool ignore_pid;
205};
206
207struct tracer;
208struct trace_option_dentry;
209
210struct array_buffer {
211 struct trace_array *tr;
212 struct trace_buffer *buffer;
213 struct trace_array_cpu __percpu *data;
214 u64 time_start;
215 int cpu;
216};
217
218#define TRACE_FLAGS_MAX_SIZE 32
219
220struct trace_options {
221 struct tracer *tracer;
222 struct trace_option_dentry *topts;
223};
224
225struct trace_pid_list *trace_pid_list_alloc(void);
226void trace_pid_list_free(struct trace_pid_list *pid_list);
227bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
228int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
229int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
230int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid);
231int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
232 unsigned int *next);
233
234enum {
235 TRACE_PIDS = BIT(0),
236 TRACE_NO_PIDS = BIT(1),
237};
238
239static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
240 struct trace_pid_list *no_pid_list)
241{
242 /* Return true if the pid list in type has pids */
243 return ((type & TRACE_PIDS) && pid_list) ||
244 ((type & TRACE_NO_PIDS) && no_pid_list);
245}
246
247static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
248 struct trace_pid_list *no_pid_list)
249{
250 /*
251 * Turning off what is in @type, return true if the "other"
252 * pid list, still has pids in it.
253 */
254 return (!(type & TRACE_PIDS) && pid_list) ||
255 (!(type & TRACE_NO_PIDS) && no_pid_list);
256}
257
258typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
259
260/**
261 * struct cond_snapshot - conditional snapshot data and callback
262 *
263 * The cond_snapshot structure encapsulates a callback function and
264 * data associated with the snapshot for a given tracing instance.
265 *
266 * When a snapshot is taken conditionally, by invoking
267 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
268 * passed in turn to the cond_snapshot.update() function. That data
269 * can be compared by the update() implementation with the cond_data
270 * contained within the struct cond_snapshot instance associated with
271 * the trace_array. Because the tr->max_lock is held throughout the
272 * update() call, the update() function can directly retrieve the
273 * cond_snapshot and cond_data associated with the per-instance
274 * snapshot associated with the trace_array.
275 *
276 * The cond_snapshot.update() implementation can save data to be
277 * associated with the snapshot if it decides to, and returns 'true'
278 * in that case, or it returns 'false' if the conditional snapshot
279 * shouldn't be taken.
280 *
281 * The cond_snapshot instance is created and associated with the
282 * user-defined cond_data by tracing_cond_snapshot_enable().
283 * Likewise, the cond_snapshot instance is destroyed and is no longer
284 * associated with the trace instance by
285 * tracing_cond_snapshot_disable().
286 *
287 * The method below is required.
288 *
289 * @update: When a conditional snapshot is invoked, the update()
290 * callback function is invoked with the tr->max_lock held. The
291 * update() implementation signals whether or not to actually
292 * take the snapshot, by returning 'true' if so, 'false' if no
293 * snapshot should be taken. Because the max_lock is held for
294 * the duration of update(), the implementation is safe to
295 * directly retrieved and save any implementation data it needs
296 * to in association with the snapshot.
297 */
298struct cond_snapshot {
299 void *cond_data;
300 cond_update_fn_t update;
301};
302
303/*
304 * struct trace_func_repeats - used to keep track of the consecutive
305 * (on the same CPU) calls of a single function.
306 */
307struct trace_func_repeats {
308 unsigned long ip;
309 unsigned long parent_ip;
310 unsigned long count;
311 u64 ts_last_call;
312};
313
314/*
315 * The trace array - an array of per-CPU trace arrays. This is the
316 * highest level data structure that individual tracers deal with.
317 * They have on/off state as well:
318 */
319struct trace_array {
320 struct list_head list;
321 char *name;
322 struct array_buffer array_buffer;
323#ifdef CONFIG_TRACER_MAX_TRACE
324 /*
325 * The max_buffer is used to snapshot the trace when a maximum
326 * latency is reached, or when the user initiates a snapshot.
327 * Some tracers will use this to store a maximum trace while
328 * it continues examining live traces.
329 *
330 * The buffers for the max_buffer are set up the same as the array_buffer
331 * When a snapshot is taken, the buffer of the max_buffer is swapped
332 * with the buffer of the array_buffer and the buffers are reset for
333 * the array_buffer so the tracing can continue.
334 */
335 struct array_buffer max_buffer;
336 bool allocated_snapshot;
337#endif
338#ifdef CONFIG_TRACER_MAX_TRACE
339 unsigned long max_latency;
340#ifdef CONFIG_FSNOTIFY
341 struct dentry *d_max_latency;
342 struct work_struct fsnotify_work;
343 struct irq_work fsnotify_irqwork;
344#endif
345#endif
346 struct trace_pid_list __rcu *filtered_pids;
347 struct trace_pid_list __rcu *filtered_no_pids;
348 /*
349 * max_lock is used to protect the swapping of buffers
350 * when taking a max snapshot. The buffers themselves are
351 * protected by per_cpu spinlocks. But the action of the swap
352 * needs its own lock.
353 *
354 * This is defined as a arch_spinlock_t in order to help
355 * with performance when lockdep debugging is enabled.
356 *
357 * It is also used in other places outside the update_max_tr
358 * so it needs to be defined outside of the
359 * CONFIG_TRACER_MAX_TRACE.
360 */
361 arch_spinlock_t max_lock;
362 int buffer_disabled;
363#ifdef CONFIG_FTRACE_SYSCALLS
364 int sys_refcount_enter;
365 int sys_refcount_exit;
366 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
367 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
368#endif
369 int stop_count;
370 int clock_id;
371 int nr_topts;
372 bool clear_trace;
373 int buffer_percent;
374 unsigned int n_err_log_entries;
375 struct tracer *current_trace;
376 unsigned int trace_flags;
377 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
378 unsigned int flags;
379 raw_spinlock_t start_lock;
380 struct list_head err_log;
381 struct dentry *dir;
382 struct dentry *options;
383 struct dentry *percpu_dir;
384 struct dentry *event_dir;
385 struct trace_options *topts;
386 struct list_head systems;
387 struct list_head events;
388 struct trace_event_file *trace_marker_file;
389 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
390 /* one per_cpu trace_pipe can be opened by only one user */
391 cpumask_var_t pipe_cpumask;
392 int ref;
393 int trace_ref;
394#ifdef CONFIG_FUNCTION_TRACER
395 struct ftrace_ops *ops;
396 struct trace_pid_list __rcu *function_pids;
397 struct trace_pid_list __rcu *function_no_pids;
398#ifdef CONFIG_DYNAMIC_FTRACE
399 /* All of these are protected by the ftrace_lock */
400 struct list_head func_probes;
401 struct list_head mod_trace;
402 struct list_head mod_notrace;
403#endif
404 /* function tracing enabled */
405 int function_enabled;
406#endif
407 int no_filter_buffering_ref;
408 struct list_head hist_vars;
409#ifdef CONFIG_TRACER_SNAPSHOT
410 struct cond_snapshot *cond_snapshot;
411#endif
412 struct trace_func_repeats __percpu *last_func_repeats;
413};
414
415enum {
416 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
417};
418
419extern struct list_head ftrace_trace_arrays;
420
421extern struct mutex trace_types_lock;
422
423extern int trace_array_get(struct trace_array *tr);
424extern int tracing_check_open_get_tr(struct trace_array *tr);
425extern struct trace_array *trace_array_find(const char *instance);
426extern struct trace_array *trace_array_find_get(const char *instance);
427
428extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
429extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
430extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
431
432extern bool trace_clock_in_ns(struct trace_array *tr);
433
434/*
435 * The global tracer (top) should be the first trace array added,
436 * but we check the flag anyway.
437 */
438static inline struct trace_array *top_trace_array(void)
439{
440 struct trace_array *tr;
441
442 if (list_empty(&ftrace_trace_arrays))
443 return NULL;
444
445 tr = list_entry(ftrace_trace_arrays.prev,
446 typeof(*tr), list);
447 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
448 return tr;
449}
450
451#define FTRACE_CMP_TYPE(var, type) \
452 __builtin_types_compatible_p(typeof(var), type *)
453
454#undef IF_ASSIGN
455#define IF_ASSIGN(var, entry, etype, id) \
456 if (FTRACE_CMP_TYPE(var, etype)) { \
457 var = (typeof(var))(entry); \
458 WARN_ON(id != 0 && (entry)->type != id); \
459 break; \
460 }
461
462/* Will cause compile errors if type is not found. */
463extern void __ftrace_bad_type(void);
464
465/*
466 * The trace_assign_type is a verifier that the entry type is
467 * the same as the type being assigned. To add new types simply
468 * add a line with the following format:
469 *
470 * IF_ASSIGN(var, ent, type, id);
471 *
472 * Where "type" is the trace type that includes the trace_entry
473 * as the "ent" item. And "id" is the trace identifier that is
474 * used in the trace_type enum.
475 *
476 * If the type can have more than one id, then use zero.
477 */
478#define trace_assign_type(var, ent) \
479 do { \
480 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
481 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
482 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
483 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
484 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
485 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
486 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
487 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
488 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
489 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
490 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
491 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
492 TRACE_MMIO_RW); \
493 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
494 TRACE_MMIO_MAP); \
495 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
496 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
497 TRACE_GRAPH_ENT); \
498 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
499 TRACE_GRAPH_RET); \
500 IF_ASSIGN(var, ent, struct func_repeats_entry, \
501 TRACE_FUNC_REPEATS); \
502 __ftrace_bad_type(); \
503 } while (0)
504
505/*
506 * An option specific to a tracer. This is a boolean value.
507 * The bit is the bit index that sets its value on the
508 * flags value in struct tracer_flags.
509 */
510struct tracer_opt {
511 const char *name; /* Will appear on the trace_options file */
512 u32 bit; /* Mask assigned in val field in tracer_flags */
513};
514
515/*
516 * The set of specific options for a tracer. Your tracer
517 * have to set the initial value of the flags val.
518 */
519struct tracer_flags {
520 u32 val;
521 struct tracer_opt *opts;
522 struct tracer *trace;
523};
524
525/* Makes more easy to define a tracer opt */
526#define TRACER_OPT(s, b) .name = #s, .bit = b
527
528
529struct trace_option_dentry {
530 struct tracer_opt *opt;
531 struct tracer_flags *flags;
532 struct trace_array *tr;
533 struct dentry *entry;
534};
535
536/**
537 * struct tracer - a specific tracer and its callbacks to interact with tracefs
538 * @name: the name chosen to select it on the available_tracers file
539 * @init: called when one switches to this tracer (echo name > current_tracer)
540 * @reset: called when one switches to another tracer
541 * @start: called when tracing is unpaused (echo 1 > tracing_on)
542 * @stop: called when tracing is paused (echo 0 > tracing_on)
543 * @update_thresh: called when tracing_thresh is updated
544 * @open: called when the trace file is opened
545 * @pipe_open: called when the trace_pipe file is opened
546 * @close: called when the trace file is released
547 * @pipe_close: called when the trace_pipe file is released
548 * @read: override the default read callback on trace_pipe
549 * @splice_read: override the default splice_read callback on trace_pipe
550 * @selftest: selftest to run on boot (see trace_selftest.c)
551 * @print_headers: override the first lines that describe your columns
552 * @print_line: callback that prints a trace
553 * @set_flag: signals one of your private flags changed (trace_options file)
554 * @flags: your private flags
555 */
556struct tracer {
557 const char *name;
558 int (*init)(struct trace_array *tr);
559 void (*reset)(struct trace_array *tr);
560 void (*start)(struct trace_array *tr);
561 void (*stop)(struct trace_array *tr);
562 int (*update_thresh)(struct trace_array *tr);
563 void (*open)(struct trace_iterator *iter);
564 void (*pipe_open)(struct trace_iterator *iter);
565 void (*close)(struct trace_iterator *iter);
566 void (*pipe_close)(struct trace_iterator *iter);
567 ssize_t (*read)(struct trace_iterator *iter,
568 struct file *filp, char __user *ubuf,
569 size_t cnt, loff_t *ppos);
570 ssize_t (*splice_read)(struct trace_iterator *iter,
571 struct file *filp,
572 loff_t *ppos,
573 struct pipe_inode_info *pipe,
574 size_t len,
575 unsigned int flags);
576#ifdef CONFIG_FTRACE_STARTUP_TEST
577 int (*selftest)(struct tracer *trace,
578 struct trace_array *tr);
579#endif
580 void (*print_header)(struct seq_file *m);
581 enum print_line_t (*print_line)(struct trace_iterator *iter);
582 /* If you handled the flag setting, return 0 */
583 int (*set_flag)(struct trace_array *tr,
584 u32 old_flags, u32 bit, int set);
585 /* Return 0 if OK with change, else return non-zero */
586 int (*flag_changed)(struct trace_array *tr,
587 u32 mask, int set);
588 struct tracer *next;
589 struct tracer_flags *flags;
590 int enabled;
591 bool print_max;
592 bool allow_instances;
593#ifdef CONFIG_TRACER_MAX_TRACE
594 bool use_max_tr;
595#endif
596 /* True if tracer cannot be enabled in kernel param */
597 bool noboot;
598};
599
600static inline struct ring_buffer_iter *
601trace_buffer_iter(struct trace_iterator *iter, int cpu)
602{
603 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
604}
605
606int tracer_init(struct tracer *t, struct trace_array *tr);
607int tracing_is_enabled(void);
608void tracing_reset_online_cpus(struct array_buffer *buf);
609void tracing_reset_all_online_cpus(void);
610void tracing_reset_all_online_cpus_unlocked(void);
611int tracing_open_generic(struct inode *inode, struct file *filp);
612int tracing_open_generic_tr(struct inode *inode, struct file *filp);
613int tracing_open_file_tr(struct inode *inode, struct file *filp);
614int tracing_release_file_tr(struct inode *inode, struct file *filp);
615bool tracing_is_disabled(void);
616bool tracer_tracing_is_on(struct trace_array *tr);
617void tracer_tracing_on(struct trace_array *tr);
618void tracer_tracing_off(struct trace_array *tr);
619struct dentry *trace_create_file(const char *name,
620 umode_t mode,
621 struct dentry *parent,
622 void *data,
623 const struct file_operations *fops);
624
625int tracing_init_dentry(void);
626
627struct ring_buffer_event;
628
629struct ring_buffer_event *
630trace_buffer_lock_reserve(struct trace_buffer *buffer,
631 int type,
632 unsigned long len,
633 unsigned int trace_ctx);
634
635struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
636 struct trace_array_cpu *data);
637
638struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
639 int *ent_cpu, u64 *ent_ts);
640
641void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
642 struct ring_buffer_event *event);
643
644bool trace_is_tracepoint_string(const char *str);
645const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
646void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
647 va_list ap) __printf(2, 0);
648char *trace_iter_expand_format(struct trace_iterator *iter);
649
650int trace_empty(struct trace_iterator *iter);
651
652void *trace_find_next_entry_inc(struct trace_iterator *iter);
653
654void trace_init_global_iter(struct trace_iterator *iter);
655
656void tracing_iter_reset(struct trace_iterator *iter, int cpu);
657
658unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
659unsigned long trace_total_entries(struct trace_array *tr);
660
661void trace_function(struct trace_array *tr,
662 unsigned long ip,
663 unsigned long parent_ip,
664 unsigned int trace_ctx);
665void trace_graph_function(struct trace_array *tr,
666 unsigned long ip,
667 unsigned long parent_ip,
668 unsigned int trace_ctx);
669void trace_latency_header(struct seq_file *m);
670void trace_default_header(struct seq_file *m);
671void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
672
673void trace_graph_return(struct ftrace_graph_ret *trace);
674int trace_graph_entry(struct ftrace_graph_ent *trace);
675void set_graph_array(struct trace_array *tr);
676
677void tracing_start_cmdline_record(void);
678void tracing_stop_cmdline_record(void);
679void tracing_start_tgid_record(void);
680void tracing_stop_tgid_record(void);
681
682int register_tracer(struct tracer *type);
683int is_tracing_stopped(void);
684
685loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
686
687extern cpumask_var_t __read_mostly tracing_buffer_mask;
688
689#define for_each_tracing_cpu(cpu) \
690 for_each_cpu(cpu, tracing_buffer_mask)
691
692extern unsigned long nsecs_to_usecs(unsigned long nsecs);
693
694extern unsigned long tracing_thresh;
695
696/* PID filtering */
697
698extern int pid_max;
699
700bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
701 pid_t search_pid);
702bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
703 struct trace_pid_list *filtered_no_pids,
704 struct task_struct *task);
705void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
706 struct task_struct *self,
707 struct task_struct *task);
708void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
709void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
710int trace_pid_show(struct seq_file *m, void *v);
711int trace_pid_write(struct trace_pid_list *filtered_pids,
712 struct trace_pid_list **new_pid_list,
713 const char __user *ubuf, size_t cnt);
714
715#ifdef CONFIG_TRACER_MAX_TRACE
716void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
717 void *cond_data);
718void update_max_tr_single(struct trace_array *tr,
719 struct task_struct *tsk, int cpu);
720
721#ifdef CONFIG_FSNOTIFY
722#define LATENCY_FS_NOTIFY
723#endif
724#endif /* CONFIG_TRACER_MAX_TRACE */
725
726#ifdef LATENCY_FS_NOTIFY
727void latency_fsnotify(struct trace_array *tr);
728#else
729static inline void latency_fsnotify(struct trace_array *tr) { }
730#endif
731
732#ifdef CONFIG_STACKTRACE
733void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
734#else
735static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
736 int skip)
737{
738}
739#endif /* CONFIG_STACKTRACE */
740
741void trace_last_func_repeats(struct trace_array *tr,
742 struct trace_func_repeats *last_info,
743 unsigned int trace_ctx);
744
745extern u64 ftrace_now(int cpu);
746
747extern void trace_find_cmdline(int pid, char comm[]);
748extern int trace_find_tgid(int pid);
749extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
750
751#ifdef CONFIG_DYNAMIC_FTRACE
752extern unsigned long ftrace_update_tot_cnt;
753extern unsigned long ftrace_number_of_pages;
754extern unsigned long ftrace_number_of_groups;
755void ftrace_init_trace_array(struct trace_array *tr);
756#else
757static inline void ftrace_init_trace_array(struct trace_array *tr) { }
758#endif
759#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
760extern int DYN_FTRACE_TEST_NAME(void);
761#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
762extern int DYN_FTRACE_TEST_NAME2(void);
763
764extern bool ring_buffer_expanded;
765extern bool tracing_selftest_disabled;
766
767#ifdef CONFIG_FTRACE_STARTUP_TEST
768extern void __init disable_tracing_selftest(const char *reason);
769
770extern int trace_selftest_startup_function(struct tracer *trace,
771 struct trace_array *tr);
772extern int trace_selftest_startup_function_graph(struct tracer *trace,
773 struct trace_array *tr);
774extern int trace_selftest_startup_irqsoff(struct tracer *trace,
775 struct trace_array *tr);
776extern int trace_selftest_startup_preemptoff(struct tracer *trace,
777 struct trace_array *tr);
778extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
779 struct trace_array *tr);
780extern int trace_selftest_startup_wakeup(struct tracer *trace,
781 struct trace_array *tr);
782extern int trace_selftest_startup_nop(struct tracer *trace,
783 struct trace_array *tr);
784extern int trace_selftest_startup_branch(struct tracer *trace,
785 struct trace_array *tr);
786/*
787 * Tracer data references selftest functions that only occur
788 * on boot up. These can be __init functions. Thus, when selftests
789 * are enabled, then the tracers need to reference __init functions.
790 */
791#define __tracer_data __refdata
792#else
793static inline void __init disable_tracing_selftest(const char *reason)
794{
795}
796/* Tracers are seldom changed. Optimize when selftests are disabled. */
797#define __tracer_data __read_mostly
798#endif /* CONFIG_FTRACE_STARTUP_TEST */
799
800extern void *head_page(struct trace_array_cpu *data);
801extern unsigned long long ns2usecs(u64 nsec);
802extern int
803trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
804extern int
805trace_vprintk(unsigned long ip, const char *fmt, va_list args);
806extern int
807trace_array_vprintk(struct trace_array *tr,
808 unsigned long ip, const char *fmt, va_list args);
809int trace_array_printk_buf(struct trace_buffer *buffer,
810 unsigned long ip, const char *fmt, ...);
811void trace_printk_seq(struct trace_seq *s);
812enum print_line_t print_trace_line(struct trace_iterator *iter);
813
814extern char trace_find_mark(unsigned long long duration);
815
816struct ftrace_hash;
817
818struct ftrace_mod_load {
819 struct list_head list;
820 char *func;
821 char *module;
822 int enable;
823};
824
825enum {
826 FTRACE_HASH_FL_MOD = (1 << 0),
827};
828
829struct ftrace_hash {
830 unsigned long size_bits;
831 struct hlist_head *buckets;
832 unsigned long count;
833 unsigned long flags;
834 struct rcu_head rcu;
835};
836
837struct ftrace_func_entry *
838ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
839
840static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
841{
842 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
843}
844
845/* Standard output formatting function used for function return traces */
846#ifdef CONFIG_FUNCTION_GRAPH_TRACER
847
848/* Flag options */
849#define TRACE_GRAPH_PRINT_OVERRUN 0x1
850#define TRACE_GRAPH_PRINT_CPU 0x2
851#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
852#define TRACE_GRAPH_PRINT_PROC 0x8
853#define TRACE_GRAPH_PRINT_DURATION 0x10
854#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
855#define TRACE_GRAPH_PRINT_REL_TIME 0x40
856#define TRACE_GRAPH_PRINT_IRQS 0x80
857#define TRACE_GRAPH_PRINT_TAIL 0x100
858#define TRACE_GRAPH_SLEEP_TIME 0x200
859#define TRACE_GRAPH_GRAPH_TIME 0x400
860#define TRACE_GRAPH_PRINT_RETVAL 0x800
861#define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000
862#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
863#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
864
865extern void ftrace_graph_sleep_time_control(bool enable);
866
867#ifdef CONFIG_FUNCTION_PROFILER
868extern void ftrace_graph_graph_time_control(bool enable);
869#else
870static inline void ftrace_graph_graph_time_control(bool enable) { }
871#endif
872
873extern enum print_line_t
874print_graph_function_flags(struct trace_iterator *iter, u32 flags);
875extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
876extern void
877trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
878extern void graph_trace_open(struct trace_iterator *iter);
879extern void graph_trace_close(struct trace_iterator *iter);
880extern int __trace_graph_entry(struct trace_array *tr,
881 struct ftrace_graph_ent *trace,
882 unsigned int trace_ctx);
883extern void __trace_graph_return(struct trace_array *tr,
884 struct ftrace_graph_ret *trace,
885 unsigned int trace_ctx);
886
887#ifdef CONFIG_DYNAMIC_FTRACE
888extern struct ftrace_hash __rcu *ftrace_graph_hash;
889extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
890
891static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
892{
893 unsigned long addr = trace->func;
894 int ret = 0;
895 struct ftrace_hash *hash;
896
897 preempt_disable_notrace();
898
899 /*
900 * Have to open code "rcu_dereference_sched()" because the
901 * function graph tracer can be called when RCU is not
902 * "watching".
903 * Protected with schedule_on_each_cpu(ftrace_sync)
904 */
905 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
906
907 if (ftrace_hash_empty(hash)) {
908 ret = 1;
909 goto out;
910 }
911
912 if (ftrace_lookup_ip(hash, addr)) {
913
914 /*
915 * This needs to be cleared on the return functions
916 * when the depth is zero.
917 */
918 trace_recursion_set(TRACE_GRAPH_BIT);
919 trace_recursion_set_depth(trace->depth);
920
921 /*
922 * If no irqs are to be traced, but a set_graph_function
923 * is set, and called by an interrupt handler, we still
924 * want to trace it.
925 */
926 if (in_hardirq())
927 trace_recursion_set(TRACE_IRQ_BIT);
928 else
929 trace_recursion_clear(TRACE_IRQ_BIT);
930 ret = 1;
931 }
932
933out:
934 preempt_enable_notrace();
935 return ret;
936}
937
938static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
939{
940 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
941 trace->depth == trace_recursion_depth())
942 trace_recursion_clear(TRACE_GRAPH_BIT);
943}
944
945static inline int ftrace_graph_notrace_addr(unsigned long addr)
946{
947 int ret = 0;
948 struct ftrace_hash *notrace_hash;
949
950 preempt_disable_notrace();
951
952 /*
953 * Have to open code "rcu_dereference_sched()" because the
954 * function graph tracer can be called when RCU is not
955 * "watching".
956 * Protected with schedule_on_each_cpu(ftrace_sync)
957 */
958 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
959 !preemptible());
960
961 if (ftrace_lookup_ip(notrace_hash, addr))
962 ret = 1;
963
964 preempt_enable_notrace();
965 return ret;
966}
967#else
968static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
969{
970 return 1;
971}
972
973static inline int ftrace_graph_notrace_addr(unsigned long addr)
974{
975 return 0;
976}
977static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
978{ }
979#endif /* CONFIG_DYNAMIC_FTRACE */
980
981extern unsigned int fgraph_max_depth;
982
983static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
984{
985 /* trace it when it is-nested-in or is a function enabled. */
986 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
987 ftrace_graph_addr(trace)) ||
988 (trace->depth < 0) ||
989 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
990}
991
992#else /* CONFIG_FUNCTION_GRAPH_TRACER */
993static inline enum print_line_t
994print_graph_function_flags(struct trace_iterator *iter, u32 flags)
995{
996 return TRACE_TYPE_UNHANDLED;
997}
998#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
999
1000extern struct list_head ftrace_pids;
1001
1002#ifdef CONFIG_FUNCTION_TRACER
1003
1004#define FTRACE_PID_IGNORE -1
1005#define FTRACE_PID_TRACE -2
1006
1007struct ftrace_func_command {
1008 struct list_head list;
1009 char *name;
1010 int (*func)(struct trace_array *tr,
1011 struct ftrace_hash *hash,
1012 char *func, char *cmd,
1013 char *params, int enable);
1014};
1015extern bool ftrace_filter_param __initdata;
1016static inline int ftrace_trace_task(struct trace_array *tr)
1017{
1018 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
1019 FTRACE_PID_IGNORE;
1020}
1021extern int ftrace_is_dead(void);
1022int ftrace_create_function_files(struct trace_array *tr,
1023 struct dentry *parent);
1024void ftrace_destroy_function_files(struct trace_array *tr);
1025int ftrace_allocate_ftrace_ops(struct trace_array *tr);
1026void ftrace_free_ftrace_ops(struct trace_array *tr);
1027void ftrace_init_global_array_ops(struct trace_array *tr);
1028void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1029void ftrace_reset_array_ops(struct trace_array *tr);
1030void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1031void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1032 struct dentry *d_tracer);
1033void ftrace_clear_pids(struct trace_array *tr);
1034int init_function_trace(void);
1035void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1036#else
1037static inline int ftrace_trace_task(struct trace_array *tr)
1038{
1039 return 1;
1040}
1041static inline int ftrace_is_dead(void) { return 0; }
1042static inline int
1043ftrace_create_function_files(struct trace_array *tr,
1044 struct dentry *parent)
1045{
1046 return 0;
1047}
1048static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1049{
1050 return 0;
1051}
1052static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1053static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1054static inline __init void
1055ftrace_init_global_array_ops(struct trace_array *tr) { }
1056static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1057static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1058static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1059static inline void ftrace_clear_pids(struct trace_array *tr) { }
1060static inline int init_function_trace(void) { return 0; }
1061static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1062/* ftace_func_t type is not defined, use macro instead of static inline */
1063#define ftrace_init_array_ops(tr, func) do { } while (0)
1064#endif /* CONFIG_FUNCTION_TRACER */
1065
1066#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1067
1068struct ftrace_probe_ops {
1069 void (*func)(unsigned long ip,
1070 unsigned long parent_ip,
1071 struct trace_array *tr,
1072 struct ftrace_probe_ops *ops,
1073 void *data);
1074 int (*init)(struct ftrace_probe_ops *ops,
1075 struct trace_array *tr,
1076 unsigned long ip, void *init_data,
1077 void **data);
1078 void (*free)(struct ftrace_probe_ops *ops,
1079 struct trace_array *tr,
1080 unsigned long ip, void *data);
1081 int (*print)(struct seq_file *m,
1082 unsigned long ip,
1083 struct ftrace_probe_ops *ops,
1084 void *data);
1085};
1086
1087struct ftrace_func_mapper;
1088typedef int (*ftrace_mapper_func)(void *data);
1089
1090struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1091void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1092 unsigned long ip);
1093int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1094 unsigned long ip, void *data);
1095void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1096 unsigned long ip);
1097void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1098 ftrace_mapper_func free_func);
1099
1100extern int
1101register_ftrace_function_probe(char *glob, struct trace_array *tr,
1102 struct ftrace_probe_ops *ops, void *data);
1103extern int
1104unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1105 struct ftrace_probe_ops *ops);
1106extern void clear_ftrace_function_probes(struct trace_array *tr);
1107
1108int register_ftrace_command(struct ftrace_func_command *cmd);
1109int unregister_ftrace_command(struct ftrace_func_command *cmd);
1110
1111void ftrace_create_filter_files(struct ftrace_ops *ops,
1112 struct dentry *parent);
1113void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1114
1115extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1116 int len, int reset);
1117extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1118 int len, int reset);
1119#else
1120struct ftrace_func_command;
1121
1122static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1123{
1124 return -EINVAL;
1125}
1126static inline __init int unregister_ftrace_command(char *cmd_name)
1127{
1128 return -EINVAL;
1129}
1130static inline void clear_ftrace_function_probes(struct trace_array *tr)
1131{
1132}
1133
1134/*
1135 * The ops parameter passed in is usually undefined.
1136 * This must be a macro.
1137 */
1138#define ftrace_create_filter_files(ops, parent) do { } while (0)
1139#define ftrace_destroy_filter_files(ops) do { } while (0)
1140#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1141
1142bool ftrace_event_is_function(struct trace_event_call *call);
1143
1144/*
1145 * struct trace_parser - servers for reading the user input separated by spaces
1146 * @cont: set if the input is not complete - no final space char was found
1147 * @buffer: holds the parsed user input
1148 * @idx: user input length
1149 * @size: buffer size
1150 */
1151struct trace_parser {
1152 bool cont;
1153 char *buffer;
1154 unsigned idx;
1155 unsigned size;
1156};
1157
1158static inline bool trace_parser_loaded(struct trace_parser *parser)
1159{
1160 return (parser->idx != 0);
1161}
1162
1163static inline bool trace_parser_cont(struct trace_parser *parser)
1164{
1165 return parser->cont;
1166}
1167
1168static inline void trace_parser_clear(struct trace_parser *parser)
1169{
1170 parser->cont = false;
1171 parser->idx = 0;
1172}
1173
1174extern int trace_parser_get_init(struct trace_parser *parser, int size);
1175extern void trace_parser_put(struct trace_parser *parser);
1176extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1177 size_t cnt, loff_t *ppos);
1178
1179/*
1180 * Only create function graph options if function graph is configured.
1181 */
1182#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1183# define FGRAPH_FLAGS \
1184 C(DISPLAY_GRAPH, "display-graph"),
1185#else
1186# define FGRAPH_FLAGS
1187#endif
1188
1189#ifdef CONFIG_BRANCH_TRACER
1190# define BRANCH_FLAGS \
1191 C(BRANCH, "branch"),
1192#else
1193# define BRANCH_FLAGS
1194#endif
1195
1196#ifdef CONFIG_FUNCTION_TRACER
1197# define FUNCTION_FLAGS \
1198 C(FUNCTION, "function-trace"), \
1199 C(FUNC_FORK, "function-fork"),
1200# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1201#else
1202# define FUNCTION_FLAGS
1203# define FUNCTION_DEFAULT_FLAGS 0UL
1204# define TRACE_ITER_FUNC_FORK 0UL
1205#endif
1206
1207#ifdef CONFIG_STACKTRACE
1208# define STACK_FLAGS \
1209 C(STACKTRACE, "stacktrace"),
1210#else
1211# define STACK_FLAGS
1212#endif
1213
1214/*
1215 * trace_iterator_flags is an enumeration that defines bit
1216 * positions into trace_flags that controls the output.
1217 *
1218 * NOTE: These bits must match the trace_options array in
1219 * trace.c (this macro guarantees it).
1220 */
1221#define TRACE_FLAGS \
1222 C(PRINT_PARENT, "print-parent"), \
1223 C(SYM_OFFSET, "sym-offset"), \
1224 C(SYM_ADDR, "sym-addr"), \
1225 C(VERBOSE, "verbose"), \
1226 C(RAW, "raw"), \
1227 C(HEX, "hex"), \
1228 C(BIN, "bin"), \
1229 C(BLOCK, "block"), \
1230 C(FIELDS, "fields"), \
1231 C(PRINTK, "trace_printk"), \
1232 C(ANNOTATE, "annotate"), \
1233 C(USERSTACKTRACE, "userstacktrace"), \
1234 C(SYM_USEROBJ, "sym-userobj"), \
1235 C(PRINTK_MSGONLY, "printk-msg-only"), \
1236 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1237 C(LATENCY_FMT, "latency-format"), \
1238 C(RECORD_CMD, "record-cmd"), \
1239 C(RECORD_TGID, "record-tgid"), \
1240 C(OVERWRITE, "overwrite"), \
1241 C(STOP_ON_FREE, "disable_on_free"), \
1242 C(IRQ_INFO, "irq-info"), \
1243 C(MARKERS, "markers"), \
1244 C(EVENT_FORK, "event-fork"), \
1245 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1246 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1247 FUNCTION_FLAGS \
1248 FGRAPH_FLAGS \
1249 STACK_FLAGS \
1250 BRANCH_FLAGS
1251
1252/*
1253 * By defining C, we can make TRACE_FLAGS a list of bit names
1254 * that will define the bits for the flag masks.
1255 */
1256#undef C
1257#define C(a, b) TRACE_ITER_##a##_BIT
1258
1259enum trace_iterator_bits {
1260 TRACE_FLAGS
1261 /* Make sure we don't go more than we have bits for */
1262 TRACE_ITER_LAST_BIT
1263};
1264
1265/*
1266 * By redefining C, we can make TRACE_FLAGS a list of masks that
1267 * use the bits as defined above.
1268 */
1269#undef C
1270#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1271
1272enum trace_iterator_flags { TRACE_FLAGS };
1273
1274/*
1275 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1276 * control the output of kernel symbols.
1277 */
1278#define TRACE_ITER_SYM_MASK \
1279 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1280
1281extern struct tracer nop_trace;
1282
1283#ifdef CONFIG_BRANCH_TRACER
1284extern int enable_branch_tracing(struct trace_array *tr);
1285extern void disable_branch_tracing(void);
1286static inline int trace_branch_enable(struct trace_array *tr)
1287{
1288 if (tr->trace_flags & TRACE_ITER_BRANCH)
1289 return enable_branch_tracing(tr);
1290 return 0;
1291}
1292static inline void trace_branch_disable(void)
1293{
1294 /* due to races, always disable */
1295 disable_branch_tracing();
1296}
1297#else
1298static inline int trace_branch_enable(struct trace_array *tr)
1299{
1300 return 0;
1301}
1302static inline void trace_branch_disable(void)
1303{
1304}
1305#endif /* CONFIG_BRANCH_TRACER */
1306
1307/* set ring buffers to default size if not already done so */
1308int tracing_update_buffers(void);
1309
1310union trace_synth_field {
1311 u8 as_u8;
1312 u16 as_u16;
1313 u32 as_u32;
1314 u64 as_u64;
1315 struct trace_dynamic_info as_dynamic;
1316};
1317
1318struct ftrace_event_field {
1319 struct list_head link;
1320 const char *name;
1321 const char *type;
1322 int filter_type;
1323 int offset;
1324 int size;
1325 int is_signed;
1326 int len;
1327};
1328
1329struct prog_entry;
1330
1331struct event_filter {
1332 struct prog_entry __rcu *prog;
1333 char *filter_string;
1334};
1335
1336struct event_subsystem {
1337 struct list_head list;
1338 const char *name;
1339 struct event_filter *filter;
1340 int ref_count;
1341};
1342
1343struct trace_subsystem_dir {
1344 struct list_head list;
1345 struct event_subsystem *subsystem;
1346 struct trace_array *tr;
1347 struct eventfs_file *ef;
1348 int ref_count;
1349 int nr_events;
1350};
1351
1352extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1353 struct trace_buffer *buffer,
1354 struct ring_buffer_event *event);
1355
1356void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1357 struct trace_buffer *buffer,
1358 struct ring_buffer_event *event,
1359 unsigned int trcace_ctx,
1360 struct pt_regs *regs);
1361
1362static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1363 struct trace_buffer *buffer,
1364 struct ring_buffer_event *event,
1365 unsigned int trace_ctx)
1366{
1367 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1368}
1369
1370DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1371DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1372void trace_buffered_event_disable(void);
1373void trace_buffered_event_enable(void);
1374
1375void early_enable_events(struct trace_array *tr, char *buf, bool disable_first);
1376
1377static inline void
1378__trace_event_discard_commit(struct trace_buffer *buffer,
1379 struct ring_buffer_event *event)
1380{
1381 if (this_cpu_read(trace_buffered_event) == event) {
1382 /* Simply release the temp buffer and enable preemption */
1383 this_cpu_dec(trace_buffered_event_cnt);
1384 preempt_enable_notrace();
1385 return;
1386 }
1387 /* ring_buffer_discard_commit() enables preemption */
1388 ring_buffer_discard_commit(buffer, event);
1389}
1390
1391/*
1392 * Helper function for event_trigger_unlock_commit{_regs}().
1393 * If there are event triggers attached to this event that requires
1394 * filtering against its fields, then they will be called as the
1395 * entry already holds the field information of the current event.
1396 *
1397 * It also checks if the event should be discarded or not.
1398 * It is to be discarded if the event is soft disabled and the
1399 * event was only recorded to process triggers, or if the event
1400 * filter is active and this event did not match the filters.
1401 *
1402 * Returns true if the event is discarded, false otherwise.
1403 */
1404static inline bool
1405__event_trigger_test_discard(struct trace_event_file *file,
1406 struct trace_buffer *buffer,
1407 struct ring_buffer_event *event,
1408 void *entry,
1409 enum event_trigger_type *tt)
1410{
1411 unsigned long eflags = file->flags;
1412
1413 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1414 *tt = event_triggers_call(file, buffer, entry, event);
1415
1416 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
1417 EVENT_FILE_FL_FILTERED |
1418 EVENT_FILE_FL_PID_FILTER))))
1419 return false;
1420
1421 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1422 goto discard;
1423
1424 if (file->flags & EVENT_FILE_FL_FILTERED &&
1425 !filter_match_preds(file->filter, entry))
1426 goto discard;
1427
1428 if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1429 trace_event_ignore_this_pid(file))
1430 goto discard;
1431
1432 return false;
1433 discard:
1434 __trace_event_discard_commit(buffer, event);
1435 return true;
1436}
1437
1438/**
1439 * event_trigger_unlock_commit - handle triggers and finish event commit
1440 * @file: The file pointer associated with the event
1441 * @buffer: The ring buffer that the event is being written to
1442 * @event: The event meta data in the ring buffer
1443 * @entry: The event itself
1444 * @trace_ctx: The tracing context flags.
1445 *
1446 * This is a helper function to handle triggers that require data
1447 * from the event itself. It also tests the event against filters and
1448 * if the event is soft disabled and should be discarded.
1449 */
1450static inline void
1451event_trigger_unlock_commit(struct trace_event_file *file,
1452 struct trace_buffer *buffer,
1453 struct ring_buffer_event *event,
1454 void *entry, unsigned int trace_ctx)
1455{
1456 enum event_trigger_type tt = ETT_NONE;
1457
1458 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1459 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1460
1461 if (tt)
1462 event_triggers_post_call(file, tt);
1463}
1464
1465#define FILTER_PRED_INVALID ((unsigned short)-1)
1466#define FILTER_PRED_IS_RIGHT (1 << 15)
1467#define FILTER_PRED_FOLD (1 << 15)
1468
1469/*
1470 * The max preds is the size of unsigned short with
1471 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1472 * and FOLD flags. The other is reserved.
1473 *
1474 * 2^14 preds is way more than enough.
1475 */
1476#define MAX_FILTER_PRED 16384
1477
1478struct filter_pred;
1479struct regex;
1480
1481typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1482
1483enum regex_type {
1484 MATCH_FULL = 0,
1485 MATCH_FRONT_ONLY,
1486 MATCH_MIDDLE_ONLY,
1487 MATCH_END_ONLY,
1488 MATCH_GLOB,
1489 MATCH_INDEX,
1490};
1491
1492struct regex {
1493 char pattern[MAX_FILTER_STR_VAL];
1494 int len;
1495 int field_len;
1496 regex_match_func match;
1497};
1498
1499static inline bool is_string_field(struct ftrace_event_field *field)
1500{
1501 return field->filter_type == FILTER_DYN_STRING ||
1502 field->filter_type == FILTER_RDYN_STRING ||
1503 field->filter_type == FILTER_STATIC_STRING ||
1504 field->filter_type == FILTER_PTR_STRING ||
1505 field->filter_type == FILTER_COMM;
1506}
1507
1508static inline bool is_function_field(struct ftrace_event_field *field)
1509{
1510 return field->filter_type == FILTER_TRACE_FN;
1511}
1512
1513extern enum regex_type
1514filter_parse_regex(char *buff, int len, char **search, int *not);
1515extern void print_event_filter(struct trace_event_file *file,
1516 struct trace_seq *s);
1517extern int apply_event_filter(struct trace_event_file *file,
1518 char *filter_string);
1519extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1520 char *filter_string);
1521extern void print_subsystem_event_filter(struct event_subsystem *system,
1522 struct trace_seq *s);
1523extern int filter_assign_type(const char *type);
1524extern int create_event_filter(struct trace_array *tr,
1525 struct trace_event_call *call,
1526 char *filter_str, bool set_str,
1527 struct event_filter **filterp);
1528extern void free_event_filter(struct event_filter *filter);
1529
1530struct ftrace_event_field *
1531trace_find_event_field(struct trace_event_call *call, char *name);
1532
1533extern void trace_event_enable_cmd_record(bool enable);
1534extern void trace_event_enable_tgid_record(bool enable);
1535
1536extern int event_trace_init(void);
1537extern int init_events(void);
1538extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1539extern int event_trace_del_tracer(struct trace_array *tr);
1540extern void __trace_early_add_events(struct trace_array *tr);
1541
1542extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1543 const char *system,
1544 const char *event);
1545extern struct trace_event_file *find_event_file(struct trace_array *tr,
1546 const char *system,
1547 const char *event);
1548
1549static inline void *event_file_data(struct file *filp)
1550{
1551 return READ_ONCE(file_inode(filp)->i_private);
1552}
1553
1554extern struct mutex event_mutex;
1555extern struct list_head ftrace_events;
1556
1557extern const struct file_operations event_trigger_fops;
1558extern const struct file_operations event_hist_fops;
1559extern const struct file_operations event_hist_debug_fops;
1560extern const struct file_operations event_inject_fops;
1561
1562#ifdef CONFIG_HIST_TRIGGERS
1563extern int register_trigger_hist_cmd(void);
1564extern int register_trigger_hist_enable_disable_cmds(void);
1565#else
1566static inline int register_trigger_hist_cmd(void) { return 0; }
1567static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1568#endif
1569
1570extern int register_trigger_cmds(void);
1571extern void clear_event_triggers(struct trace_array *tr);
1572
1573enum {
1574 EVENT_TRIGGER_FL_PROBE = BIT(0),
1575};
1576
1577struct event_trigger_data {
1578 unsigned long count;
1579 int ref;
1580 int flags;
1581 struct event_trigger_ops *ops;
1582 struct event_command *cmd_ops;
1583 struct event_filter __rcu *filter;
1584 char *filter_str;
1585 void *private_data;
1586 bool paused;
1587 bool paused_tmp;
1588 struct list_head list;
1589 char *name;
1590 struct list_head named_list;
1591 struct event_trigger_data *named_data;
1592};
1593
1594/* Avoid typos */
1595#define ENABLE_EVENT_STR "enable_event"
1596#define DISABLE_EVENT_STR "disable_event"
1597#define ENABLE_HIST_STR "enable_hist"
1598#define DISABLE_HIST_STR "disable_hist"
1599
1600struct enable_trigger_data {
1601 struct trace_event_file *file;
1602 bool enable;
1603 bool hist;
1604};
1605
1606extern int event_enable_trigger_print(struct seq_file *m,
1607 struct event_trigger_data *data);
1608extern void event_enable_trigger_free(struct event_trigger_data *data);
1609extern int event_enable_trigger_parse(struct event_command *cmd_ops,
1610 struct trace_event_file *file,
1611 char *glob, char *cmd,
1612 char *param_and_filter);
1613extern int event_enable_register_trigger(char *glob,
1614 struct event_trigger_data *data,
1615 struct trace_event_file *file);
1616extern void event_enable_unregister_trigger(char *glob,
1617 struct event_trigger_data *test,
1618 struct trace_event_file *file);
1619extern void trigger_data_free(struct event_trigger_data *data);
1620extern int event_trigger_init(struct event_trigger_data *data);
1621extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1622 int trigger_enable);
1623extern void update_cond_flag(struct trace_event_file *file);
1624extern int set_trigger_filter(char *filter_str,
1625 struct event_trigger_data *trigger_data,
1626 struct trace_event_file *file);
1627extern struct event_trigger_data *find_named_trigger(const char *name);
1628extern bool is_named_trigger(struct event_trigger_data *test);
1629extern int save_named_trigger(const char *name,
1630 struct event_trigger_data *data);
1631extern void del_named_trigger(struct event_trigger_data *data);
1632extern void pause_named_trigger(struct event_trigger_data *data);
1633extern void unpause_named_trigger(struct event_trigger_data *data);
1634extern void set_named_trigger_data(struct event_trigger_data *data,
1635 struct event_trigger_data *named_data);
1636extern struct event_trigger_data *
1637get_named_trigger_data(struct event_trigger_data *data);
1638extern int register_event_command(struct event_command *cmd);
1639extern int unregister_event_command(struct event_command *cmd);
1640extern int register_trigger_hist_enable_disable_cmds(void);
1641extern bool event_trigger_check_remove(const char *glob);
1642extern bool event_trigger_empty_param(const char *param);
1643extern int event_trigger_separate_filter(char *param_and_filter, char **param,
1644 char **filter, bool param_required);
1645extern struct event_trigger_data *
1646event_trigger_alloc(struct event_command *cmd_ops,
1647 char *cmd,
1648 char *param,
1649 void *private_data);
1650extern int event_trigger_parse_num(char *trigger,
1651 struct event_trigger_data *trigger_data);
1652extern int event_trigger_set_filter(struct event_command *cmd_ops,
1653 struct trace_event_file *file,
1654 char *param,
1655 struct event_trigger_data *trigger_data);
1656extern void event_trigger_reset_filter(struct event_command *cmd_ops,
1657 struct event_trigger_data *trigger_data);
1658extern int event_trigger_register(struct event_command *cmd_ops,
1659 struct trace_event_file *file,
1660 char *glob,
1661 struct event_trigger_data *trigger_data);
1662extern void event_trigger_unregister(struct event_command *cmd_ops,
1663 struct trace_event_file *file,
1664 char *glob,
1665 struct event_trigger_data *trigger_data);
1666
1667/**
1668 * struct event_trigger_ops - callbacks for trace event triggers
1669 *
1670 * The methods in this structure provide per-event trigger hooks for
1671 * various trigger operations.
1672 *
1673 * The @init and @free methods are used during trigger setup and
1674 * teardown, typically called from an event_command's @parse()
1675 * function implementation.
1676 *
1677 * The @print method is used to print the trigger spec.
1678 *
1679 * The @trigger method is the function that actually implements the
1680 * trigger and is called in the context of the triggering event
1681 * whenever that event occurs.
1682 *
1683 * All the methods below, except for @init() and @free(), must be
1684 * implemented.
1685 *
1686 * @trigger: The trigger 'probe' function called when the triggering
1687 * event occurs. The data passed into this callback is the data
1688 * that was supplied to the event_command @reg() function that
1689 * registered the trigger (see struct event_command) along with
1690 * the trace record, rec.
1691 *
1692 * @init: An optional initialization function called for the trigger
1693 * when the trigger is registered (via the event_command reg()
1694 * function). This can be used to perform per-trigger
1695 * initialization such as incrementing a per-trigger reference
1696 * count, for instance. This is usually implemented by the
1697 * generic utility function @event_trigger_init() (see
1698 * trace_event_triggers.c).
1699 *
1700 * @free: An optional de-initialization function called for the
1701 * trigger when the trigger is unregistered (via the
1702 * event_command @reg() function). This can be used to perform
1703 * per-trigger de-initialization such as decrementing a
1704 * per-trigger reference count and freeing corresponding trigger
1705 * data, for instance. This is usually implemented by the
1706 * generic utility function @event_trigger_free() (see
1707 * trace_event_triggers.c).
1708 *
1709 * @print: The callback function invoked to have the trigger print
1710 * itself. This is usually implemented by a wrapper function
1711 * that calls the generic utility function @event_trigger_print()
1712 * (see trace_event_triggers.c).
1713 */
1714struct event_trigger_ops {
1715 void (*trigger)(struct event_trigger_data *data,
1716 struct trace_buffer *buffer,
1717 void *rec,
1718 struct ring_buffer_event *rbe);
1719 int (*init)(struct event_trigger_data *data);
1720 void (*free)(struct event_trigger_data *data);
1721 int (*print)(struct seq_file *m,
1722 struct event_trigger_data *data);
1723};
1724
1725/**
1726 * struct event_command - callbacks and data members for event commands
1727 *
1728 * Event commands are invoked by users by writing the command name
1729 * into the 'trigger' file associated with a trace event. The
1730 * parameters associated with a specific invocation of an event
1731 * command are used to create an event trigger instance, which is
1732 * added to the list of trigger instances associated with that trace
1733 * event. When the event is hit, the set of triggers associated with
1734 * that event is invoked.
1735 *
1736 * The data members in this structure provide per-event command data
1737 * for various event commands.
1738 *
1739 * All the data members below, except for @post_trigger, must be set
1740 * for each event command.
1741 *
1742 * @name: The unique name that identifies the event command. This is
1743 * the name used when setting triggers via trigger files.
1744 *
1745 * @trigger_type: A unique id that identifies the event command
1746 * 'type'. This value has two purposes, the first to ensure that
1747 * only one trigger of the same type can be set at a given time
1748 * for a particular event e.g. it doesn't make sense to have both
1749 * a traceon and traceoff trigger attached to a single event at
1750 * the same time, so traceon and traceoff have the same type
1751 * though they have different names. The @trigger_type value is
1752 * also used as a bit value for deferring the actual trigger
1753 * action until after the current event is finished. Some
1754 * commands need to do this if they themselves log to the trace
1755 * buffer (see the @post_trigger() member below). @trigger_type
1756 * values are defined by adding new values to the trigger_type
1757 * enum in include/linux/trace_events.h.
1758 *
1759 * @flags: See the enum event_command_flags below.
1760 *
1761 * All the methods below, except for @set_filter() and @unreg_all(),
1762 * must be implemented.
1763 *
1764 * @parse: The callback function responsible for parsing and
1765 * registering the trigger written to the 'trigger' file by the
1766 * user. It allocates the trigger instance and registers it with
1767 * the appropriate trace event. It makes use of the other
1768 * event_command callback functions to orchestrate this, and is
1769 * usually implemented by the generic utility function
1770 * @event_trigger_callback() (see trace_event_triggers.c).
1771 *
1772 * @reg: Adds the trigger to the list of triggers associated with the
1773 * event, and enables the event trigger itself, after
1774 * initializing it (via the event_trigger_ops @init() function).
1775 * This is also where commands can use the @trigger_type value to
1776 * make the decision as to whether or not multiple instances of
1777 * the trigger should be allowed. This is usually implemented by
1778 * the generic utility function @register_trigger() (see
1779 * trace_event_triggers.c).
1780 *
1781 * @unreg: Removes the trigger from the list of triggers associated
1782 * with the event, and disables the event trigger itself, after
1783 * initializing it (via the event_trigger_ops @free() function).
1784 * This is usually implemented by the generic utility function
1785 * @unregister_trigger() (see trace_event_triggers.c).
1786 *
1787 * @unreg_all: An optional function called to remove all the triggers
1788 * from the list of triggers associated with the event. Called
1789 * when a trigger file is opened in truncate mode.
1790 *
1791 * @set_filter: An optional function called to parse and set a filter
1792 * for the trigger. If no @set_filter() method is set for the
1793 * event command, filters set by the user for the command will be
1794 * ignored. This is usually implemented by the generic utility
1795 * function @set_trigger_filter() (see trace_event_triggers.c).
1796 *
1797 * @get_trigger_ops: The callback function invoked to retrieve the
1798 * event_trigger_ops implementation associated with the command.
1799 * This callback function allows a single event_command to
1800 * support multiple trigger implementations via different sets of
1801 * event_trigger_ops, depending on the value of the @param
1802 * string.
1803 */
1804struct event_command {
1805 struct list_head list;
1806 char *name;
1807 enum event_trigger_type trigger_type;
1808 int flags;
1809 int (*parse)(struct event_command *cmd_ops,
1810 struct trace_event_file *file,
1811 char *glob, char *cmd,
1812 char *param_and_filter);
1813 int (*reg)(char *glob,
1814 struct event_trigger_data *data,
1815 struct trace_event_file *file);
1816 void (*unreg)(char *glob,
1817 struct event_trigger_data *data,
1818 struct trace_event_file *file);
1819 void (*unreg_all)(struct trace_event_file *file);
1820 int (*set_filter)(char *filter_str,
1821 struct event_trigger_data *data,
1822 struct trace_event_file *file);
1823 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1824};
1825
1826/**
1827 * enum event_command_flags - flags for struct event_command
1828 *
1829 * @POST_TRIGGER: A flag that says whether or not this command needs
1830 * to have its action delayed until after the current event has
1831 * been closed. Some triggers need to avoid being invoked while
1832 * an event is currently in the process of being logged, since
1833 * the trigger may itself log data into the trace buffer. Thus
1834 * we make sure the current event is committed before invoking
1835 * those triggers. To do that, the trigger invocation is split
1836 * in two - the first part checks the filter using the current
1837 * trace record; if a command has the @post_trigger flag set, it
1838 * sets a bit for itself in the return value, otherwise it
1839 * directly invokes the trigger. Once all commands have been
1840 * either invoked or set their return flag, the current record is
1841 * either committed or discarded. At that point, if any commands
1842 * have deferred their triggers, those commands are finally
1843 * invoked following the close of the current event. In other
1844 * words, if the event_trigger_ops @func() probe implementation
1845 * itself logs to the trace buffer, this flag should be set,
1846 * otherwise it can be left unspecified.
1847 *
1848 * @NEEDS_REC: A flag that says whether or not this command needs
1849 * access to the trace record in order to perform its function,
1850 * regardless of whether or not it has a filter associated with
1851 * it (filters make a trigger require access to the trace record
1852 * but are not always present).
1853 */
1854enum event_command_flags {
1855 EVENT_CMD_FL_POST_TRIGGER = 1,
1856 EVENT_CMD_FL_NEEDS_REC = 2,
1857};
1858
1859static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1860{
1861 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1862}
1863
1864static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1865{
1866 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1867}
1868
1869extern int trace_event_enable_disable(struct trace_event_file *file,
1870 int enable, int soft_disable);
1871extern int tracing_alloc_snapshot(void);
1872extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1873extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1874
1875extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1876extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1877
1878extern const char *__start___trace_bprintk_fmt[];
1879extern const char *__stop___trace_bprintk_fmt[];
1880
1881extern const char *__start___tracepoint_str[];
1882extern const char *__stop___tracepoint_str[];
1883
1884void trace_printk_control(bool enabled);
1885void trace_printk_start_comm(void);
1886int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1887int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1888
1889/* Used from boot time tracer */
1890extern int trace_set_options(struct trace_array *tr, char *option);
1891extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1892extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1893 unsigned long size, int cpu_id);
1894extern int tracing_set_cpumask(struct trace_array *tr,
1895 cpumask_var_t tracing_cpumask_new);
1896
1897
1898#define MAX_EVENT_NAME_LEN 64
1899
1900extern ssize_t trace_parse_run_command(struct file *file,
1901 const char __user *buffer, size_t count, loff_t *ppos,
1902 int (*createfn)(const char *));
1903
1904extern unsigned int err_pos(char *cmd, const char *str);
1905extern void tracing_log_err(struct trace_array *tr,
1906 const char *loc, const char *cmd,
1907 const char **errs, u8 type, u16 pos);
1908
1909/*
1910 * Normal trace_printk() and friends allocates special buffers
1911 * to do the manipulation, as well as saves the print formats
1912 * into sections to display. But the trace infrastructure wants
1913 * to use these without the added overhead at the price of being
1914 * a bit slower (used mainly for warnings, where we don't care
1915 * about performance). The internal_trace_puts() is for such
1916 * a purpose.
1917 */
1918#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1919
1920#undef FTRACE_ENTRY
1921#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1922 extern struct trace_event_call \
1923 __aligned(4) event_##call;
1924#undef FTRACE_ENTRY_DUP
1925#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1926 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1927#undef FTRACE_ENTRY_PACKED
1928#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1929 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1930
1931#include "trace_entries.h"
1932
1933#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1934int perf_ftrace_event_register(struct trace_event_call *call,
1935 enum trace_reg type, void *data);
1936#else
1937#define perf_ftrace_event_register NULL
1938#endif
1939
1940#ifdef CONFIG_FTRACE_SYSCALLS
1941void init_ftrace_syscalls(void);
1942const char *get_syscall_name(int syscall);
1943#else
1944static inline void init_ftrace_syscalls(void) { }
1945static inline const char *get_syscall_name(int syscall)
1946{
1947 return NULL;
1948}
1949#endif
1950
1951#ifdef CONFIG_EVENT_TRACING
1952void trace_event_init(void);
1953void trace_event_eval_update(struct trace_eval_map **map, int len);
1954/* Used from boot time tracer */
1955extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1956extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1957#else
1958static inline void __init trace_event_init(void) { }
1959static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1960#endif
1961
1962#ifdef CONFIG_TRACER_SNAPSHOT
1963void tracing_snapshot_instance(struct trace_array *tr);
1964int tracing_alloc_snapshot_instance(struct trace_array *tr);
1965#else
1966static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1967static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1968{
1969 return 0;
1970}
1971#endif
1972
1973#ifdef CONFIG_PREEMPT_TRACER
1974void tracer_preempt_on(unsigned long a0, unsigned long a1);
1975void tracer_preempt_off(unsigned long a0, unsigned long a1);
1976#else
1977static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1978static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1979#endif
1980#ifdef CONFIG_IRQSOFF_TRACER
1981void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1982void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1983#else
1984static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1985static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1986#endif
1987
1988/*
1989 * Reset the state of the trace_iterator so that it can read consumed data.
1990 * Normally, the trace_iterator is used for reading the data when it is not
1991 * consumed, and must retain state.
1992 */
1993static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1994{
1995 memset_startat(iter, 0, seq);
1996 iter->pos = -1;
1997}
1998
1999/* Check the name is good for event/group/fields */
2000static inline bool __is_good_name(const char *name, bool hash_ok)
2001{
2002 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-'))
2003 return false;
2004 while (*++name != '\0') {
2005 if (!isalpha(*name) && !isdigit(*name) && *name != '_' &&
2006 (!hash_ok || *name != '-'))
2007 return false;
2008 }
2009 return true;
2010}
2011
2012/* Check the name is good for event/group/fields */
2013static inline bool is_good_name(const char *name)
2014{
2015 return __is_good_name(name, false);
2016}
2017
2018/* Check the name is good for system */
2019static inline bool is_good_system_name(const char *name)
2020{
2021 return __is_good_name(name, true);
2022}
2023
2024/* Convert certain expected symbols into '_' when generating event names */
2025static inline void sanitize_event_name(char *name)
2026{
2027 while (*name++ != '\0')
2028 if (*name == ':' || *name == '.')
2029 *name = '_';
2030}
2031
2032/*
2033 * This is a generic way to read and write a u64 value from a file in tracefs.
2034 *
2035 * The value is stored on the variable pointed by *val. The value needs
2036 * to be at least *min and at most *max. The write is protected by an
2037 * existing *lock.
2038 */
2039struct trace_min_max_param {
2040 struct mutex *lock;
2041 u64 *val;
2042 u64 *min;
2043 u64 *max;
2044};
2045
2046#define U64_STR_SIZE 24 /* 20 digits max */
2047
2048extern const struct file_operations trace_min_max_fops;
2049
2050#ifdef CONFIG_RV
2051extern int rv_init_interface(void);
2052#else
2053static inline int rv_init_interface(void)
2054{
2055 return 0;
2056}
2057#endif
2058
2059#endif /* _LINUX_KERNEL_TRACE_H */