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 #ifdef CONFIG_FTRACE_SYSCALLS
26 #include <asm/unistd.h> /* For NR_SYSCALLS */
27 #include <asm/syscall.h> /* some archs define it here */
28 #endif
29
30 enum trace_type {
31 __TRACE_FIRST_TYPE = 0,
32
33 TRACE_FN,
34 TRACE_CTX,
35 TRACE_WAKE,
36 TRACE_STACK,
37 TRACE_PRINT,
38 TRACE_BPRINT,
39 TRACE_MMIO_RW,
40 TRACE_MMIO_MAP,
41 TRACE_BRANCH,
42 TRACE_GRAPH_RET,
43 TRACE_GRAPH_ENT,
44 TRACE_USER_STACK,
45 TRACE_BLK,
46 TRACE_BPUTS,
47 TRACE_HWLAT,
48 TRACE_OSNOISE,
49 TRACE_TIMERLAT,
50 TRACE_RAW_DATA,
51 TRACE_FUNC_REPEATS,
52
53 __TRACE_LAST_TYPE,
54 };
55
56
57 #undef __field
58 #define __field(type, item) type item;
59
60 #undef __field_fn
61 #define __field_fn(type, item) type item;
62
63 #undef __field_struct
64 #define __field_struct(type, item) __field(type, item)
65
66 #undef __field_desc
67 #define __field_desc(type, container, item)
68
69 #undef __field_packed
70 #define __field_packed(type, container, item)
71
72 #undef __array
73 #define __array(type, item, size) type item[size];
74
75 #undef __array_desc
76 #define __array_desc(type, container, item, size)
77
78 #undef __dynamic_array
79 #define __dynamic_array(type, item) type item[];
80
81 #undef F_STRUCT
82 #define F_STRUCT(args...) args
83
84 #undef FTRACE_ENTRY
85 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
86 struct struct_name { \
87 struct trace_entry ent; \
88 tstruct \
89 }
90
91 #undef FTRACE_ENTRY_DUP
92 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
93
94 #undef FTRACE_ENTRY_REG
95 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
96 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
97
98 #undef FTRACE_ENTRY_PACKED
99 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
100 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
101
102 #include "trace_entries.h"
103
104 /* Use this for memory failure errors */
105 #define MEM_FAIL(condition, fmt, ...) \
106 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__)
107
108 /*
109 * syscalls are special, and need special handling, this is why
110 * they are not included in trace_entries.h
111 */
112 struct syscall_trace_enter {
113 struct trace_entry ent;
114 int nr;
115 unsigned long args[];
116 };
117
118 struct syscall_trace_exit {
119 struct trace_entry ent;
120 int nr;
121 long ret;
122 };
123
124 struct kprobe_trace_entry_head {
125 struct trace_entry ent;
126 unsigned long ip;
127 };
128
129 struct eprobe_trace_entry_head {
130 struct trace_entry ent;
131 unsigned int type;
132 };
133
134 struct 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
142 struct 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 */
149 struct 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
173 struct tracer;
174 struct trace_option_dentry;
175
176 struct 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
186 struct trace_options {
187 struct tracer *tracer;
188 struct trace_option_dentry *topts;
189 };
190
191 struct trace_pid_list {
192 int pid_max;
193 unsigned long *pids;
194 };
195
196 enum {
197 TRACE_PIDS = BIT(0),
198 TRACE_NO_PIDS = BIT(1),
199 };
200
pid_type_enabled(int type,struct trace_pid_list * pid_list,struct trace_pid_list * no_pid_list)201 static 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
still_need_pid_events(int type,struct trace_pid_list * pid_list,struct trace_pid_list * no_pid_list)209 static 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
220 typedef 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 */
260 struct 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 */
269 struct 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 */
281 struct 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 || defined(CONFIG_OSNOISE_TRACER)
302 unsigned long max_latency;
303 #ifdef CONFIG_FSNOTIFY
304 struct dentry *d_max_latency;
305 struct work_struct fsnotify_work;
306 struct irq_work fsnotify_irqwork;
307 #endif
308 #endif
309 struct trace_pid_list __rcu *filtered_pids;
310 struct trace_pid_list __rcu *filtered_no_pids;
311 /*
312 * max_lock is used to protect the swapping of buffers
313 * when taking a max snapshot. The buffers themselves are
314 * protected by per_cpu spinlocks. But the action of the swap
315 * needs its own lock.
316 *
317 * This is defined as a arch_spinlock_t in order to help
318 * with performance when lockdep debugging is enabled.
319 *
320 * It is also used in other places outside the update_max_tr
321 * so it needs to be defined outside of the
322 * CONFIG_TRACER_MAX_TRACE.
323 */
324 arch_spinlock_t max_lock;
325 int buffer_disabled;
326 #ifdef CONFIG_FTRACE_SYSCALLS
327 int sys_refcount_enter;
328 int sys_refcount_exit;
329 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
330 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
331 #endif
332 int stop_count;
333 int clock_id;
334 int nr_topts;
335 bool clear_trace;
336 int buffer_percent;
337 unsigned int n_err_log_entries;
338 struct tracer *current_trace;
339 unsigned int trace_flags;
340 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
341 unsigned int flags;
342 raw_spinlock_t start_lock;
343 struct list_head err_log;
344 struct dentry *dir;
345 struct dentry *options;
346 struct dentry *percpu_dir;
347 struct dentry *event_dir;
348 struct trace_options *topts;
349 struct list_head systems;
350 struct list_head events;
351 struct trace_event_file *trace_marker_file;
352 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
353 int ref;
354 int trace_ref;
355 #ifdef CONFIG_FUNCTION_TRACER
356 struct ftrace_ops *ops;
357 struct trace_pid_list __rcu *function_pids;
358 struct trace_pid_list __rcu *function_no_pids;
359 #ifdef CONFIG_DYNAMIC_FTRACE
360 /* All of these are protected by the ftrace_lock */
361 struct list_head func_probes;
362 struct list_head mod_trace;
363 struct list_head mod_notrace;
364 #endif
365 /* function tracing enabled */
366 int function_enabled;
367 #endif
368 int no_filter_buffering_ref;
369 struct list_head hist_vars;
370 #ifdef CONFIG_TRACER_SNAPSHOT
371 struct cond_snapshot *cond_snapshot;
372 #endif
373 struct trace_func_repeats __percpu *last_func_repeats;
374 };
375
376 enum {
377 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
378 };
379
380 extern struct list_head ftrace_trace_arrays;
381
382 extern struct mutex trace_types_lock;
383
384 extern int trace_array_get(struct trace_array *tr);
385 extern int tracing_check_open_get_tr(struct trace_array *tr);
386 extern struct trace_array *trace_array_find(const char *instance);
387 extern struct trace_array *trace_array_find_get(const char *instance);
388
389 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
390 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
391 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
392
393 extern bool trace_clock_in_ns(struct trace_array *tr);
394
395 /*
396 * The global tracer (top) should be the first trace array added,
397 * but we check the flag anyway.
398 */
top_trace_array(void)399 static inline struct trace_array *top_trace_array(void)
400 {
401 struct trace_array *tr;
402
403 if (list_empty(&ftrace_trace_arrays))
404 return NULL;
405
406 tr = list_entry(ftrace_trace_arrays.prev,
407 typeof(*tr), list);
408 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
409 return tr;
410 }
411
412 #define FTRACE_CMP_TYPE(var, type) \
413 __builtin_types_compatible_p(typeof(var), type *)
414
415 #undef IF_ASSIGN
416 #define IF_ASSIGN(var, entry, etype, id) \
417 if (FTRACE_CMP_TYPE(var, etype)) { \
418 var = (typeof(var))(entry); \
419 WARN_ON(id != 0 && (entry)->type != id); \
420 break; \
421 }
422
423 /* Will cause compile errors if type is not found. */
424 extern void __ftrace_bad_type(void);
425
426 /*
427 * The trace_assign_type is a verifier that the entry type is
428 * the same as the type being assigned. To add new types simply
429 * add a line with the following format:
430 *
431 * IF_ASSIGN(var, ent, type, id);
432 *
433 * Where "type" is the trace type that includes the trace_entry
434 * as the "ent" item. And "id" is the trace identifier that is
435 * used in the trace_type enum.
436 *
437 * If the type can have more than one id, then use zero.
438 */
439 #define trace_assign_type(var, ent) \
440 do { \
441 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
442 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
443 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
444 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
445 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
446 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
447 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
448 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
449 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
450 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
451 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
452 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
453 TRACE_MMIO_RW); \
454 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
455 TRACE_MMIO_MAP); \
456 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
457 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
458 TRACE_GRAPH_ENT); \
459 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
460 TRACE_GRAPH_RET); \
461 IF_ASSIGN(var, ent, struct func_repeats_entry, \
462 TRACE_FUNC_REPEATS); \
463 __ftrace_bad_type(); \
464 } while (0)
465
466 /*
467 * An option specific to a tracer. This is a boolean value.
468 * The bit is the bit index that sets its value on the
469 * flags value in struct tracer_flags.
470 */
471 struct tracer_opt {
472 const char *name; /* Will appear on the trace_options file */
473 u32 bit; /* Mask assigned in val field in tracer_flags */
474 };
475
476 /*
477 * The set of specific options for a tracer. Your tracer
478 * have to set the initial value of the flags val.
479 */
480 struct tracer_flags {
481 u32 val;
482 struct tracer_opt *opts;
483 struct tracer *trace;
484 };
485
486 /* Makes more easy to define a tracer opt */
487 #define TRACER_OPT(s, b) .name = #s, .bit = b
488
489
490 struct trace_option_dentry {
491 struct tracer_opt *opt;
492 struct tracer_flags *flags;
493 struct trace_array *tr;
494 struct dentry *entry;
495 };
496
497 /**
498 * struct tracer - a specific tracer and its callbacks to interact with tracefs
499 * @name: the name chosen to select it on the available_tracers file
500 * @init: called when one switches to this tracer (echo name > current_tracer)
501 * @reset: called when one switches to another tracer
502 * @start: called when tracing is unpaused (echo 1 > tracing_on)
503 * @stop: called when tracing is paused (echo 0 > tracing_on)
504 * @update_thresh: called when tracing_thresh is updated
505 * @open: called when the trace file is opened
506 * @pipe_open: called when the trace_pipe file is opened
507 * @close: called when the trace file is released
508 * @pipe_close: called when the trace_pipe file is released
509 * @read: override the default read callback on trace_pipe
510 * @splice_read: override the default splice_read callback on trace_pipe
511 * @selftest: selftest to run on boot (see trace_selftest.c)
512 * @print_headers: override the first lines that describe your columns
513 * @print_line: callback that prints a trace
514 * @set_flag: signals one of your private flags changed (trace_options file)
515 * @flags: your private flags
516 */
517 struct tracer {
518 const char *name;
519 int (*init)(struct trace_array *tr);
520 void (*reset)(struct trace_array *tr);
521 void (*start)(struct trace_array *tr);
522 void (*stop)(struct trace_array *tr);
523 int (*update_thresh)(struct trace_array *tr);
524 void (*open)(struct trace_iterator *iter);
525 void (*pipe_open)(struct trace_iterator *iter);
526 void (*close)(struct trace_iterator *iter);
527 void (*pipe_close)(struct trace_iterator *iter);
528 ssize_t (*read)(struct trace_iterator *iter,
529 struct file *filp, char __user *ubuf,
530 size_t cnt, loff_t *ppos);
531 ssize_t (*splice_read)(struct trace_iterator *iter,
532 struct file *filp,
533 loff_t *ppos,
534 struct pipe_inode_info *pipe,
535 size_t len,
536 unsigned int flags);
537 #ifdef CONFIG_FTRACE_STARTUP_TEST
538 int (*selftest)(struct tracer *trace,
539 struct trace_array *tr);
540 #endif
541 void (*print_header)(struct seq_file *m);
542 enum print_line_t (*print_line)(struct trace_iterator *iter);
543 /* If you handled the flag setting, return 0 */
544 int (*set_flag)(struct trace_array *tr,
545 u32 old_flags, u32 bit, int set);
546 /* Return 0 if OK with change, else return non-zero */
547 int (*flag_changed)(struct trace_array *tr,
548 u32 mask, int set);
549 struct tracer *next;
550 struct tracer_flags *flags;
551 int enabled;
552 bool print_max;
553 bool allow_instances;
554 #ifdef CONFIG_TRACER_MAX_TRACE
555 bool use_max_tr;
556 #endif
557 /* True if tracer cannot be enabled in kernel param */
558 bool noboot;
559 };
560
561 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)562 trace_buffer_iter(struct trace_iterator *iter, int cpu)
563 {
564 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
565 }
566
567 int tracer_init(struct tracer *t, struct trace_array *tr);
568 int tracing_is_enabled(void);
569 void tracing_reset_online_cpus(struct array_buffer *buf);
570 void tracing_reset_current(int cpu);
571 void tracing_reset_all_online_cpus(void);
572 int tracing_open_generic(struct inode *inode, struct file *filp);
573 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
574 bool tracing_is_disabled(void);
575 bool tracer_tracing_is_on(struct trace_array *tr);
576 void tracer_tracing_on(struct trace_array *tr);
577 void tracer_tracing_off(struct trace_array *tr);
578 struct dentry *trace_create_file(const char *name,
579 umode_t mode,
580 struct dentry *parent,
581 void *data,
582 const struct file_operations *fops);
583
584 int tracing_init_dentry(void);
585
586 struct ring_buffer_event;
587
588 struct ring_buffer_event *
589 trace_buffer_lock_reserve(struct trace_buffer *buffer,
590 int type,
591 unsigned long len,
592 unsigned int trace_ctx);
593
594 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
595 struct trace_array_cpu *data);
596
597 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
598 int *ent_cpu, u64 *ent_ts);
599
600 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
601 struct ring_buffer_event *event);
602
603 bool trace_is_tracepoint_string(const char *str);
604 const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
605 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
606 va_list ap);
607
608 int trace_empty(struct trace_iterator *iter);
609
610 void *trace_find_next_entry_inc(struct trace_iterator *iter);
611
612 void trace_init_global_iter(struct trace_iterator *iter);
613
614 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
615
616 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
617 unsigned long trace_total_entries(struct trace_array *tr);
618
619 void trace_function(struct trace_array *tr,
620 unsigned long ip,
621 unsigned long parent_ip,
622 unsigned int trace_ctx);
623 void trace_graph_function(struct trace_array *tr,
624 unsigned long ip,
625 unsigned long parent_ip,
626 unsigned int trace_ctx);
627 void trace_latency_header(struct seq_file *m);
628 void trace_default_header(struct seq_file *m);
629 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
630
631 void trace_graph_return(struct ftrace_graph_ret *trace);
632 int trace_graph_entry(struct ftrace_graph_ent *trace);
633 void set_graph_array(struct trace_array *tr);
634
635 void tracing_start_cmdline_record(void);
636 void tracing_stop_cmdline_record(void);
637 void tracing_start_tgid_record(void);
638 void tracing_stop_tgid_record(void);
639
640 int register_tracer(struct tracer *type);
641 int is_tracing_stopped(void);
642
643 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
644
645 extern cpumask_var_t __read_mostly tracing_buffer_mask;
646
647 #define for_each_tracing_cpu(cpu) \
648 for_each_cpu(cpu, tracing_buffer_mask)
649
650 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
651
652 extern unsigned long tracing_thresh;
653
654 /* PID filtering */
655
656 extern int pid_max;
657
658 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
659 pid_t search_pid);
660 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
661 struct trace_pid_list *filtered_no_pids,
662 struct task_struct *task);
663 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
664 struct task_struct *self,
665 struct task_struct *task);
666 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
667 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
668 int trace_pid_show(struct seq_file *m, void *v);
669 void trace_free_pid_list(struct trace_pid_list *pid_list);
670 int trace_pid_write(struct trace_pid_list *filtered_pids,
671 struct trace_pid_list **new_pid_list,
672 const char __user *ubuf, size_t cnt);
673
674 #ifdef CONFIG_TRACER_MAX_TRACE
675 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
676 void *cond_data);
677 void update_max_tr_single(struct trace_array *tr,
678 struct task_struct *tsk, int cpu);
679 #endif /* CONFIG_TRACER_MAX_TRACE */
680
681 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
682 || defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
683 #define LATENCY_FS_NOTIFY
684 #endif
685
686 #ifdef LATENCY_FS_NOTIFY
687 void latency_fsnotify(struct trace_array *tr);
688 #else
latency_fsnotify(struct trace_array * tr)689 static inline void latency_fsnotify(struct trace_array *tr) { }
690 #endif
691
692 #ifdef CONFIG_STACKTRACE
693 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
694 #else
__trace_stack(struct trace_array * tr,unsigned int trace_ctx,int skip)695 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
696 int skip)
697 {
698 }
699 #endif /* CONFIG_STACKTRACE */
700
701 void trace_last_func_repeats(struct trace_array *tr,
702 struct trace_func_repeats *last_info,
703 unsigned int trace_ctx);
704
705 extern u64 ftrace_now(int cpu);
706
707 extern void trace_find_cmdline(int pid, char comm[]);
708 extern int trace_find_tgid(int pid);
709 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
710
711 #ifdef CONFIG_DYNAMIC_FTRACE
712 extern unsigned long ftrace_update_tot_cnt;
713 extern unsigned long ftrace_number_of_pages;
714 extern unsigned long ftrace_number_of_groups;
715 void ftrace_init_trace_array(struct trace_array *tr);
716 #else
ftrace_init_trace_array(struct trace_array * tr)717 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
718 #endif
719 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
720 extern int DYN_FTRACE_TEST_NAME(void);
721 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
722 extern int DYN_FTRACE_TEST_NAME2(void);
723
724 extern bool ring_buffer_expanded;
725 extern bool tracing_selftest_disabled;
726
727 #ifdef CONFIG_FTRACE_STARTUP_TEST
728 extern void __init disable_tracing_selftest(const char *reason);
729
730 extern int trace_selftest_startup_function(struct tracer *trace,
731 struct trace_array *tr);
732 extern int trace_selftest_startup_function_graph(struct tracer *trace,
733 struct trace_array *tr);
734 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
735 struct trace_array *tr);
736 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
737 struct trace_array *tr);
738 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
739 struct trace_array *tr);
740 extern int trace_selftest_startup_wakeup(struct tracer *trace,
741 struct trace_array *tr);
742 extern int trace_selftest_startup_nop(struct tracer *trace,
743 struct trace_array *tr);
744 extern int trace_selftest_startup_branch(struct tracer *trace,
745 struct trace_array *tr);
746 /*
747 * Tracer data references selftest functions that only occur
748 * on boot up. These can be __init functions. Thus, when selftests
749 * are enabled, then the tracers need to reference __init functions.
750 */
751 #define __tracer_data __refdata
752 #else
disable_tracing_selftest(const char * reason)753 static inline void __init disable_tracing_selftest(const char *reason)
754 {
755 }
756 /* Tracers are seldom changed. Optimize when selftests are disabled. */
757 #define __tracer_data __read_mostly
758 #endif /* CONFIG_FTRACE_STARTUP_TEST */
759
760 extern void *head_page(struct trace_array_cpu *data);
761 extern unsigned long long ns2usecs(u64 nsec);
762 extern int
763 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
764 extern int
765 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
766 extern int
767 trace_array_vprintk(struct trace_array *tr,
768 unsigned long ip, const char *fmt, va_list args);
769 int trace_array_printk_buf(struct trace_buffer *buffer,
770 unsigned long ip, const char *fmt, ...);
771 void trace_printk_seq(struct trace_seq *s);
772 enum print_line_t print_trace_line(struct trace_iterator *iter);
773
774 extern char trace_find_mark(unsigned long long duration);
775
776 struct ftrace_hash;
777
778 struct ftrace_mod_load {
779 struct list_head list;
780 char *func;
781 char *module;
782 int enable;
783 };
784
785 enum {
786 FTRACE_HASH_FL_MOD = (1 << 0),
787 };
788
789 struct ftrace_hash {
790 unsigned long size_bits;
791 struct hlist_head *buckets;
792 unsigned long count;
793 unsigned long flags;
794 struct rcu_head rcu;
795 };
796
797 struct ftrace_func_entry *
798 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
799
ftrace_hash_empty(struct ftrace_hash * hash)800 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
801 {
802 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
803 }
804
805 /* Standard output formatting function used for function return traces */
806 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
807
808 /* Flag options */
809 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
810 #define TRACE_GRAPH_PRINT_CPU 0x2
811 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
812 #define TRACE_GRAPH_PRINT_PROC 0x8
813 #define TRACE_GRAPH_PRINT_DURATION 0x10
814 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
815 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
816 #define TRACE_GRAPH_PRINT_IRQS 0x80
817 #define TRACE_GRAPH_PRINT_TAIL 0x100
818 #define TRACE_GRAPH_SLEEP_TIME 0x200
819 #define TRACE_GRAPH_GRAPH_TIME 0x400
820 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
821 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
822
823 extern void ftrace_graph_sleep_time_control(bool enable);
824
825 #ifdef CONFIG_FUNCTION_PROFILER
826 extern void ftrace_graph_graph_time_control(bool enable);
827 #else
ftrace_graph_graph_time_control(bool enable)828 static inline void ftrace_graph_graph_time_control(bool enable) { }
829 #endif
830
831 extern enum print_line_t
832 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
833 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
834 extern void
835 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
836 extern void graph_trace_open(struct trace_iterator *iter);
837 extern void graph_trace_close(struct trace_iterator *iter);
838 extern int __trace_graph_entry(struct trace_array *tr,
839 struct ftrace_graph_ent *trace,
840 unsigned int trace_ctx);
841 extern void __trace_graph_return(struct trace_array *tr,
842 struct ftrace_graph_ret *trace,
843 unsigned int trace_ctx);
844
845 #ifdef CONFIG_DYNAMIC_FTRACE
846 extern struct ftrace_hash __rcu *ftrace_graph_hash;
847 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
848
ftrace_graph_addr(struct ftrace_graph_ent * trace)849 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
850 {
851 unsigned long addr = trace->func;
852 int ret = 0;
853 struct ftrace_hash *hash;
854
855 preempt_disable_notrace();
856
857 /*
858 * Have to open code "rcu_dereference_sched()" because the
859 * function graph tracer can be called when RCU is not
860 * "watching".
861 * Protected with schedule_on_each_cpu(ftrace_sync)
862 */
863 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
864
865 if (ftrace_hash_empty(hash)) {
866 ret = 1;
867 goto out;
868 }
869
870 if (ftrace_lookup_ip(hash, addr)) {
871
872 /*
873 * This needs to be cleared on the return functions
874 * when the depth is zero.
875 */
876 trace_recursion_set(TRACE_GRAPH_BIT);
877 trace_recursion_set_depth(trace->depth);
878
879 /*
880 * If no irqs are to be traced, but a set_graph_function
881 * is set, and called by an interrupt handler, we still
882 * want to trace it.
883 */
884 if (in_irq())
885 trace_recursion_set(TRACE_IRQ_BIT);
886 else
887 trace_recursion_clear(TRACE_IRQ_BIT);
888 ret = 1;
889 }
890
891 out:
892 preempt_enable_notrace();
893 return ret;
894 }
895
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)896 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
897 {
898 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
899 trace->depth == trace_recursion_depth())
900 trace_recursion_clear(TRACE_GRAPH_BIT);
901 }
902
ftrace_graph_notrace_addr(unsigned long addr)903 static inline int ftrace_graph_notrace_addr(unsigned long addr)
904 {
905 int ret = 0;
906 struct ftrace_hash *notrace_hash;
907
908 preempt_disable_notrace();
909
910 /*
911 * Have to open code "rcu_dereference_sched()" because the
912 * function graph tracer can be called when RCU is not
913 * "watching".
914 * Protected with schedule_on_each_cpu(ftrace_sync)
915 */
916 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
917 !preemptible());
918
919 if (ftrace_lookup_ip(notrace_hash, addr))
920 ret = 1;
921
922 preempt_enable_notrace();
923 return ret;
924 }
925 #else
ftrace_graph_addr(struct ftrace_graph_ent * trace)926 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
927 {
928 return 1;
929 }
930
ftrace_graph_notrace_addr(unsigned long addr)931 static inline int ftrace_graph_notrace_addr(unsigned long addr)
932 {
933 return 0;
934 }
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)935 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
936 { }
937 #endif /* CONFIG_DYNAMIC_FTRACE */
938
939 extern unsigned int fgraph_max_depth;
940
ftrace_graph_ignore_func(struct ftrace_graph_ent * trace)941 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
942 {
943 /* trace it when it is-nested-in or is a function enabled. */
944 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
945 ftrace_graph_addr(trace)) ||
946 (trace->depth < 0) ||
947 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
948 }
949
950 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
951 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)952 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
953 {
954 return TRACE_TYPE_UNHANDLED;
955 }
956 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
957
958 extern struct list_head ftrace_pids;
959
960 #ifdef CONFIG_FUNCTION_TRACER
961
962 #define FTRACE_PID_IGNORE -1
963 #define FTRACE_PID_TRACE -2
964
965 struct ftrace_func_command {
966 struct list_head list;
967 char *name;
968 int (*func)(struct trace_array *tr,
969 struct ftrace_hash *hash,
970 char *func, char *cmd,
971 char *params, int enable);
972 };
973 extern bool ftrace_filter_param __initdata;
ftrace_trace_task(struct trace_array * tr)974 static inline int ftrace_trace_task(struct trace_array *tr)
975 {
976 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
977 FTRACE_PID_IGNORE;
978 }
979 extern int ftrace_is_dead(void);
980 int ftrace_create_function_files(struct trace_array *tr,
981 struct dentry *parent);
982 void ftrace_destroy_function_files(struct trace_array *tr);
983 int ftrace_allocate_ftrace_ops(struct trace_array *tr);
984 void ftrace_free_ftrace_ops(struct trace_array *tr);
985 void ftrace_init_global_array_ops(struct trace_array *tr);
986 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
987 void ftrace_reset_array_ops(struct trace_array *tr);
988 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
989 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
990 struct dentry *d_tracer);
991 void ftrace_clear_pids(struct trace_array *tr);
992 int init_function_trace(void);
993 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
994 #else
ftrace_trace_task(struct trace_array * tr)995 static inline int ftrace_trace_task(struct trace_array *tr)
996 {
997 return 1;
998 }
ftrace_is_dead(void)999 static inline int ftrace_is_dead(void) { return 0; }
1000 static inline int
ftrace_create_function_files(struct trace_array * tr,struct dentry * parent)1001 ftrace_create_function_files(struct trace_array *tr,
1002 struct dentry *parent)
1003 {
1004 return 0;
1005 }
ftrace_allocate_ftrace_ops(struct trace_array * tr)1006 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1007 {
1008 return 0;
1009 }
ftrace_free_ftrace_ops(struct trace_array * tr)1010 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
ftrace_destroy_function_files(struct trace_array * tr)1011 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1012 static inline __init void
ftrace_init_global_array_ops(struct trace_array * tr)1013 ftrace_init_global_array_ops(struct trace_array *tr) { }
ftrace_reset_array_ops(struct trace_array * tr)1014 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
ftrace_init_tracefs(struct trace_array * tr,struct dentry * d)1015 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
ftrace_init_tracefs_toplevel(struct trace_array * tr,struct dentry * d)1016 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
ftrace_clear_pids(struct trace_array * tr)1017 static inline void ftrace_clear_pids(struct trace_array *tr) { }
init_function_trace(void)1018 static inline int init_function_trace(void) { return 0; }
ftrace_pid_follow_fork(struct trace_array * tr,bool enable)1019 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1020 /* ftace_func_t type is not defined, use macro instead of static inline */
1021 #define ftrace_init_array_ops(tr, func) do { } while (0)
1022 #endif /* CONFIG_FUNCTION_TRACER */
1023
1024 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1025
1026 struct ftrace_probe_ops {
1027 void (*func)(unsigned long ip,
1028 unsigned long parent_ip,
1029 struct trace_array *tr,
1030 struct ftrace_probe_ops *ops,
1031 void *data);
1032 int (*init)(struct ftrace_probe_ops *ops,
1033 struct trace_array *tr,
1034 unsigned long ip, void *init_data,
1035 void **data);
1036 void (*free)(struct ftrace_probe_ops *ops,
1037 struct trace_array *tr,
1038 unsigned long ip, void *data);
1039 int (*print)(struct seq_file *m,
1040 unsigned long ip,
1041 struct ftrace_probe_ops *ops,
1042 void *data);
1043 };
1044
1045 struct ftrace_func_mapper;
1046 typedef int (*ftrace_mapper_func)(void *data);
1047
1048 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1049 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1050 unsigned long ip);
1051 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1052 unsigned long ip, void *data);
1053 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1054 unsigned long ip);
1055 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1056 ftrace_mapper_func free_func);
1057
1058 extern int
1059 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1060 struct ftrace_probe_ops *ops, void *data);
1061 extern int
1062 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1063 struct ftrace_probe_ops *ops);
1064 extern void clear_ftrace_function_probes(struct trace_array *tr);
1065
1066 int register_ftrace_command(struct ftrace_func_command *cmd);
1067 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1068
1069 void ftrace_create_filter_files(struct ftrace_ops *ops,
1070 struct dentry *parent);
1071 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1072
1073 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1074 int len, int reset);
1075 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1076 int len, int reset);
1077 #else
1078 struct ftrace_func_command;
1079
register_ftrace_command(struct ftrace_func_command * cmd)1080 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1081 {
1082 return -EINVAL;
1083 }
unregister_ftrace_command(char * cmd_name)1084 static inline __init int unregister_ftrace_command(char *cmd_name)
1085 {
1086 return -EINVAL;
1087 }
clear_ftrace_function_probes(struct trace_array * tr)1088 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1089 {
1090 }
1091
1092 /*
1093 * The ops parameter passed in is usually undefined.
1094 * This must be a macro.
1095 */
1096 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1097 #define ftrace_destroy_filter_files(ops) do { } while (0)
1098 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1099
1100 bool ftrace_event_is_function(struct trace_event_call *call);
1101
1102 /*
1103 * struct trace_parser - servers for reading the user input separated by spaces
1104 * @cont: set if the input is not complete - no final space char was found
1105 * @buffer: holds the parsed user input
1106 * @idx: user input length
1107 * @size: buffer size
1108 */
1109 struct trace_parser {
1110 bool cont;
1111 char *buffer;
1112 unsigned idx;
1113 unsigned size;
1114 };
1115
trace_parser_loaded(struct trace_parser * parser)1116 static inline bool trace_parser_loaded(struct trace_parser *parser)
1117 {
1118 return (parser->idx != 0);
1119 }
1120
trace_parser_cont(struct trace_parser * parser)1121 static inline bool trace_parser_cont(struct trace_parser *parser)
1122 {
1123 return parser->cont;
1124 }
1125
trace_parser_clear(struct trace_parser * parser)1126 static inline void trace_parser_clear(struct trace_parser *parser)
1127 {
1128 parser->cont = false;
1129 parser->idx = 0;
1130 }
1131
1132 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1133 extern void trace_parser_put(struct trace_parser *parser);
1134 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1135 size_t cnt, loff_t *ppos);
1136
1137 /*
1138 * Only create function graph options if function graph is configured.
1139 */
1140 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1141 # define FGRAPH_FLAGS \
1142 C(DISPLAY_GRAPH, "display-graph"),
1143 #else
1144 # define FGRAPH_FLAGS
1145 #endif
1146
1147 #ifdef CONFIG_BRANCH_TRACER
1148 # define BRANCH_FLAGS \
1149 C(BRANCH, "branch"),
1150 #else
1151 # define BRANCH_FLAGS
1152 #endif
1153
1154 #ifdef CONFIG_FUNCTION_TRACER
1155 # define FUNCTION_FLAGS \
1156 C(FUNCTION, "function-trace"), \
1157 C(FUNC_FORK, "function-fork"),
1158 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1159 #else
1160 # define FUNCTION_FLAGS
1161 # define FUNCTION_DEFAULT_FLAGS 0UL
1162 # define TRACE_ITER_FUNC_FORK 0UL
1163 #endif
1164
1165 #ifdef CONFIG_STACKTRACE
1166 # define STACK_FLAGS \
1167 C(STACKTRACE, "stacktrace"),
1168 #else
1169 # define STACK_FLAGS
1170 #endif
1171
1172 /*
1173 * trace_iterator_flags is an enumeration that defines bit
1174 * positions into trace_flags that controls the output.
1175 *
1176 * NOTE: These bits must match the trace_options array in
1177 * trace.c (this macro guarantees it).
1178 */
1179 #define TRACE_FLAGS \
1180 C(PRINT_PARENT, "print-parent"), \
1181 C(SYM_OFFSET, "sym-offset"), \
1182 C(SYM_ADDR, "sym-addr"), \
1183 C(VERBOSE, "verbose"), \
1184 C(RAW, "raw"), \
1185 C(HEX, "hex"), \
1186 C(BIN, "bin"), \
1187 C(BLOCK, "block"), \
1188 C(PRINTK, "trace_printk"), \
1189 C(ANNOTATE, "annotate"), \
1190 C(USERSTACKTRACE, "userstacktrace"), \
1191 C(SYM_USEROBJ, "sym-userobj"), \
1192 C(PRINTK_MSGONLY, "printk-msg-only"), \
1193 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1194 C(LATENCY_FMT, "latency-format"), \
1195 C(RECORD_CMD, "record-cmd"), \
1196 C(RECORD_TGID, "record-tgid"), \
1197 C(OVERWRITE, "overwrite"), \
1198 C(STOP_ON_FREE, "disable_on_free"), \
1199 C(IRQ_INFO, "irq-info"), \
1200 C(MARKERS, "markers"), \
1201 C(EVENT_FORK, "event-fork"), \
1202 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1203 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1204 FUNCTION_FLAGS \
1205 FGRAPH_FLAGS \
1206 STACK_FLAGS \
1207 BRANCH_FLAGS
1208
1209 /*
1210 * By defining C, we can make TRACE_FLAGS a list of bit names
1211 * that will define the bits for the flag masks.
1212 */
1213 #undef C
1214 #define C(a, b) TRACE_ITER_##a##_BIT
1215
1216 enum trace_iterator_bits {
1217 TRACE_FLAGS
1218 /* Make sure we don't go more than we have bits for */
1219 TRACE_ITER_LAST_BIT
1220 };
1221
1222 /*
1223 * By redefining C, we can make TRACE_FLAGS a list of masks that
1224 * use the bits as defined above.
1225 */
1226 #undef C
1227 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1228
1229 enum trace_iterator_flags { TRACE_FLAGS };
1230
1231 /*
1232 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1233 * control the output of kernel symbols.
1234 */
1235 #define TRACE_ITER_SYM_MASK \
1236 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1237
1238 extern struct tracer nop_trace;
1239
1240 #ifdef CONFIG_BRANCH_TRACER
1241 extern int enable_branch_tracing(struct trace_array *tr);
1242 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)1243 static inline int trace_branch_enable(struct trace_array *tr)
1244 {
1245 if (tr->trace_flags & TRACE_ITER_BRANCH)
1246 return enable_branch_tracing(tr);
1247 return 0;
1248 }
trace_branch_disable(void)1249 static inline void trace_branch_disable(void)
1250 {
1251 /* due to races, always disable */
1252 disable_branch_tracing();
1253 }
1254 #else
trace_branch_enable(struct trace_array * tr)1255 static inline int trace_branch_enable(struct trace_array *tr)
1256 {
1257 return 0;
1258 }
trace_branch_disable(void)1259 static inline void trace_branch_disable(void)
1260 {
1261 }
1262 #endif /* CONFIG_BRANCH_TRACER */
1263
1264 /* set ring buffers to default size if not already done so */
1265 int tracing_update_buffers(void);
1266
1267 struct ftrace_event_field {
1268 struct list_head link;
1269 const char *name;
1270 const char *type;
1271 int filter_type;
1272 int offset;
1273 int size;
1274 int is_signed;
1275 };
1276
1277 struct prog_entry;
1278
1279 struct event_filter {
1280 struct prog_entry __rcu *prog;
1281 char *filter_string;
1282 };
1283
1284 struct event_subsystem {
1285 struct list_head list;
1286 const char *name;
1287 struct event_filter *filter;
1288 int ref_count;
1289 };
1290
1291 struct trace_subsystem_dir {
1292 struct list_head list;
1293 struct event_subsystem *subsystem;
1294 struct trace_array *tr;
1295 struct dentry *entry;
1296 int ref_count;
1297 int nr_events;
1298 };
1299
1300 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1301 struct trace_buffer *buffer,
1302 struct ring_buffer_event *event);
1303
1304 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1305 struct trace_buffer *buffer,
1306 struct ring_buffer_event *event,
1307 unsigned int trcace_ctx,
1308 struct pt_regs *regs);
1309
trace_buffer_unlock_commit(struct trace_array * tr,struct trace_buffer * buffer,struct ring_buffer_event * event,unsigned int trace_ctx)1310 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1311 struct trace_buffer *buffer,
1312 struct ring_buffer_event *event,
1313 unsigned int trace_ctx)
1314 {
1315 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1316 }
1317
1318 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1319 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1320 void trace_buffered_event_disable(void);
1321 void trace_buffered_event_enable(void);
1322
1323 static inline void
__trace_event_discard_commit(struct trace_buffer * buffer,struct ring_buffer_event * event)1324 __trace_event_discard_commit(struct trace_buffer *buffer,
1325 struct ring_buffer_event *event)
1326 {
1327 if (this_cpu_read(trace_buffered_event) == event) {
1328 /* Simply release the temp buffer */
1329 this_cpu_dec(trace_buffered_event_cnt);
1330 return;
1331 }
1332 ring_buffer_discard_commit(buffer, event);
1333 }
1334
1335 /*
1336 * Helper function for event_trigger_unlock_commit{_regs}().
1337 * If there are event triggers attached to this event that requires
1338 * filtering against its fields, then they will be called as the
1339 * entry already holds the field information of the current event.
1340 *
1341 * It also checks if the event should be discarded or not.
1342 * It is to be discarded if the event is soft disabled and the
1343 * event was only recorded to process triggers, or if the event
1344 * filter is active and this event did not match the filters.
1345 *
1346 * Returns true if the event is discarded, false otherwise.
1347 */
1348 static inline bool
__event_trigger_test_discard(struct trace_event_file * file,struct trace_buffer * buffer,struct ring_buffer_event * event,void * entry,enum event_trigger_type * tt)1349 __event_trigger_test_discard(struct trace_event_file *file,
1350 struct trace_buffer *buffer,
1351 struct ring_buffer_event *event,
1352 void *entry,
1353 enum event_trigger_type *tt)
1354 {
1355 unsigned long eflags = file->flags;
1356
1357 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1358 *tt = event_triggers_call(file, buffer, entry, event);
1359
1360 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1361 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1362 !filter_match_preds(file->filter, entry))) {
1363 __trace_event_discard_commit(buffer, event);
1364 return true;
1365 }
1366
1367 return false;
1368 }
1369
1370 /**
1371 * event_trigger_unlock_commit - handle triggers and finish event commit
1372 * @file: The file pointer associated with the event
1373 * @buffer: The ring buffer that the event is being written to
1374 * @event: The event meta data in the ring buffer
1375 * @entry: The event itself
1376 * @trace_ctx: The tracing context flags.
1377 *
1378 * This is a helper function to handle triggers that require data
1379 * from the event itself. It also tests the event against filters and
1380 * if the event is soft disabled and should be discarded.
1381 */
1382 static inline void
event_trigger_unlock_commit(struct trace_event_file * file,struct trace_buffer * buffer,struct ring_buffer_event * event,void * entry,unsigned int trace_ctx)1383 event_trigger_unlock_commit(struct trace_event_file *file,
1384 struct trace_buffer *buffer,
1385 struct ring_buffer_event *event,
1386 void *entry, unsigned int trace_ctx)
1387 {
1388 enum event_trigger_type tt = ETT_NONE;
1389
1390 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1391 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1392
1393 if (tt)
1394 event_triggers_post_call(file, tt);
1395 }
1396
1397 #define FILTER_PRED_INVALID ((unsigned short)-1)
1398 #define FILTER_PRED_IS_RIGHT (1 << 15)
1399 #define FILTER_PRED_FOLD (1 << 15)
1400
1401 /*
1402 * The max preds is the size of unsigned short with
1403 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1404 * and FOLD flags. The other is reserved.
1405 *
1406 * 2^14 preds is way more than enough.
1407 */
1408 #define MAX_FILTER_PRED 16384
1409
1410 struct filter_pred;
1411 struct regex;
1412
1413 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1414
1415 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1416
1417 enum regex_type {
1418 MATCH_FULL = 0,
1419 MATCH_FRONT_ONLY,
1420 MATCH_MIDDLE_ONLY,
1421 MATCH_END_ONLY,
1422 MATCH_GLOB,
1423 MATCH_INDEX,
1424 };
1425
1426 struct regex {
1427 char pattern[MAX_FILTER_STR_VAL];
1428 int len;
1429 int field_len;
1430 regex_match_func match;
1431 };
1432
1433 struct filter_pred {
1434 filter_pred_fn_t fn;
1435 u64 val;
1436 struct regex regex;
1437 unsigned short *ops;
1438 struct ftrace_event_field *field;
1439 int offset;
1440 int not;
1441 int op;
1442 };
1443
is_string_field(struct ftrace_event_field * field)1444 static inline bool is_string_field(struct ftrace_event_field *field)
1445 {
1446 return field->filter_type == FILTER_DYN_STRING ||
1447 field->filter_type == FILTER_STATIC_STRING ||
1448 field->filter_type == FILTER_PTR_STRING ||
1449 field->filter_type == FILTER_COMM;
1450 }
1451
is_function_field(struct ftrace_event_field * field)1452 static inline bool is_function_field(struct ftrace_event_field *field)
1453 {
1454 return field->filter_type == FILTER_TRACE_FN;
1455 }
1456
1457 extern enum regex_type
1458 filter_parse_regex(char *buff, int len, char **search, int *not);
1459 extern void print_event_filter(struct trace_event_file *file,
1460 struct trace_seq *s);
1461 extern int apply_event_filter(struct trace_event_file *file,
1462 char *filter_string);
1463 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1464 char *filter_string);
1465 extern void print_subsystem_event_filter(struct event_subsystem *system,
1466 struct trace_seq *s);
1467 extern int filter_assign_type(const char *type);
1468 extern int create_event_filter(struct trace_array *tr,
1469 struct trace_event_call *call,
1470 char *filter_str, bool set_str,
1471 struct event_filter **filterp);
1472 extern void free_event_filter(struct event_filter *filter);
1473
1474 struct ftrace_event_field *
1475 trace_find_event_field(struct trace_event_call *call, char *name);
1476
1477 extern void trace_event_enable_cmd_record(bool enable);
1478 extern void trace_event_enable_tgid_record(bool enable);
1479
1480 extern int event_trace_init(void);
1481 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1482 extern int event_trace_del_tracer(struct trace_array *tr);
1483 extern void __trace_early_add_events(struct trace_array *tr);
1484
1485 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1486 const char *system,
1487 const char *event);
1488 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1489 const char *system,
1490 const char *event);
1491
event_file_data(struct file * filp)1492 static inline void *event_file_data(struct file *filp)
1493 {
1494 return READ_ONCE(file_inode(filp)->i_private);
1495 }
1496
1497 extern struct mutex event_mutex;
1498 extern struct list_head ftrace_events;
1499
1500 extern const struct file_operations event_trigger_fops;
1501 extern const struct file_operations event_hist_fops;
1502 extern const struct file_operations event_hist_debug_fops;
1503 extern const struct file_operations event_inject_fops;
1504
1505 #ifdef CONFIG_HIST_TRIGGERS
1506 extern int register_trigger_hist_cmd(void);
1507 extern int register_trigger_hist_enable_disable_cmds(void);
1508 #else
register_trigger_hist_cmd(void)1509 static inline int register_trigger_hist_cmd(void) { return 0; }
register_trigger_hist_enable_disable_cmds(void)1510 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1511 #endif
1512
1513 extern int register_trigger_cmds(void);
1514 extern void clear_event_triggers(struct trace_array *tr);
1515
1516 enum {
1517 EVENT_TRIGGER_FL_PROBE = BIT(0),
1518 };
1519
1520 struct event_trigger_data {
1521 unsigned long count;
1522 int ref;
1523 int flags;
1524 struct event_trigger_ops *ops;
1525 struct event_command *cmd_ops;
1526 struct event_filter __rcu *filter;
1527 char *filter_str;
1528 void *private_data;
1529 bool paused;
1530 bool paused_tmp;
1531 struct list_head list;
1532 char *name;
1533 struct list_head named_list;
1534 struct event_trigger_data *named_data;
1535 };
1536
1537 /* Avoid typos */
1538 #define ENABLE_EVENT_STR "enable_event"
1539 #define DISABLE_EVENT_STR "disable_event"
1540 #define ENABLE_HIST_STR "enable_hist"
1541 #define DISABLE_HIST_STR "disable_hist"
1542
1543 struct enable_trigger_data {
1544 struct trace_event_file *file;
1545 bool enable;
1546 bool hist;
1547 };
1548
1549 extern int event_enable_trigger_print(struct seq_file *m,
1550 struct event_trigger_ops *ops,
1551 struct event_trigger_data *data);
1552 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1553 struct event_trigger_data *data);
1554 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1555 struct trace_event_file *file,
1556 char *glob, char *cmd, char *param);
1557 extern int event_enable_register_trigger(char *glob,
1558 struct event_trigger_ops *ops,
1559 struct event_trigger_data *data,
1560 struct trace_event_file *file);
1561 extern void event_enable_unregister_trigger(char *glob,
1562 struct event_trigger_ops *ops,
1563 struct event_trigger_data *test,
1564 struct trace_event_file *file);
1565 extern void trigger_data_free(struct event_trigger_data *data);
1566 extern int event_trigger_init(struct event_trigger_ops *ops,
1567 struct event_trigger_data *data);
1568 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1569 int trigger_enable);
1570 extern void update_cond_flag(struct trace_event_file *file);
1571 extern int set_trigger_filter(char *filter_str,
1572 struct event_trigger_data *trigger_data,
1573 struct trace_event_file *file);
1574 extern struct event_trigger_data *find_named_trigger(const char *name);
1575 extern bool is_named_trigger(struct event_trigger_data *test);
1576 extern int save_named_trigger(const char *name,
1577 struct event_trigger_data *data);
1578 extern void del_named_trigger(struct event_trigger_data *data);
1579 extern void pause_named_trigger(struct event_trigger_data *data);
1580 extern void unpause_named_trigger(struct event_trigger_data *data);
1581 extern void set_named_trigger_data(struct event_trigger_data *data,
1582 struct event_trigger_data *named_data);
1583 extern struct event_trigger_data *
1584 get_named_trigger_data(struct event_trigger_data *data);
1585 extern int register_event_command(struct event_command *cmd);
1586 extern int unregister_event_command(struct event_command *cmd);
1587 extern int register_trigger_hist_enable_disable_cmds(void);
1588
1589 /**
1590 * struct event_trigger_ops - callbacks for trace event triggers
1591 *
1592 * The methods in this structure provide per-event trigger hooks for
1593 * various trigger operations.
1594 *
1595 * All the methods below, except for @init() and @free(), must be
1596 * implemented.
1597 *
1598 * @func: The trigger 'probe' function called when the triggering
1599 * event occurs. The data passed into this callback is the data
1600 * that was supplied to the event_command @reg() function that
1601 * registered the trigger (see struct event_command) along with
1602 * the trace record, rec.
1603 *
1604 * @init: An optional initialization function called for the trigger
1605 * when the trigger is registered (via the event_command reg()
1606 * function). This can be used to perform per-trigger
1607 * initialization such as incrementing a per-trigger reference
1608 * count, for instance. This is usually implemented by the
1609 * generic utility function @event_trigger_init() (see
1610 * trace_event_triggers.c).
1611 *
1612 * @free: An optional de-initialization function called for the
1613 * trigger when the trigger is unregistered (via the
1614 * event_command @reg() function). This can be used to perform
1615 * per-trigger de-initialization such as decrementing a
1616 * per-trigger reference count and freeing corresponding trigger
1617 * data, for instance. This is usually implemented by the
1618 * generic utility function @event_trigger_free() (see
1619 * trace_event_triggers.c).
1620 *
1621 * @print: The callback function invoked to have the trigger print
1622 * itself. This is usually implemented by a wrapper function
1623 * that calls the generic utility function @event_trigger_print()
1624 * (see trace_event_triggers.c).
1625 */
1626 struct event_trigger_ops {
1627 void (*func)(struct event_trigger_data *data,
1628 struct trace_buffer *buffer, void *rec,
1629 struct ring_buffer_event *rbe);
1630 int (*init)(struct event_trigger_ops *ops,
1631 struct event_trigger_data *data);
1632 void (*free)(struct event_trigger_ops *ops,
1633 struct event_trigger_data *data);
1634 int (*print)(struct seq_file *m,
1635 struct event_trigger_ops *ops,
1636 struct event_trigger_data *data);
1637 };
1638
1639 /**
1640 * struct event_command - callbacks and data members for event commands
1641 *
1642 * Event commands are invoked by users by writing the command name
1643 * into the 'trigger' file associated with a trace event. The
1644 * parameters associated with a specific invocation of an event
1645 * command are used to create an event trigger instance, which is
1646 * added to the list of trigger instances associated with that trace
1647 * event. When the event is hit, the set of triggers associated with
1648 * that event is invoked.
1649 *
1650 * The data members in this structure provide per-event command data
1651 * for various event commands.
1652 *
1653 * All the data members below, except for @post_trigger, must be set
1654 * for each event command.
1655 *
1656 * @name: The unique name that identifies the event command. This is
1657 * the name used when setting triggers via trigger files.
1658 *
1659 * @trigger_type: A unique id that identifies the event command
1660 * 'type'. This value has two purposes, the first to ensure that
1661 * only one trigger of the same type can be set at a given time
1662 * for a particular event e.g. it doesn't make sense to have both
1663 * a traceon and traceoff trigger attached to a single event at
1664 * the same time, so traceon and traceoff have the same type
1665 * though they have different names. The @trigger_type value is
1666 * also used as a bit value for deferring the actual trigger
1667 * action until after the current event is finished. Some
1668 * commands need to do this if they themselves log to the trace
1669 * buffer (see the @post_trigger() member below). @trigger_type
1670 * values are defined by adding new values to the trigger_type
1671 * enum in include/linux/trace_events.h.
1672 *
1673 * @flags: See the enum event_command_flags below.
1674 *
1675 * All the methods below, except for @set_filter() and @unreg_all(),
1676 * must be implemented.
1677 *
1678 * @func: The callback function responsible for parsing and
1679 * registering the trigger written to the 'trigger' file by the
1680 * user. It allocates the trigger instance and registers it with
1681 * the appropriate trace event. It makes use of the other
1682 * event_command callback functions to orchestrate this, and is
1683 * usually implemented by the generic utility function
1684 * @event_trigger_callback() (see trace_event_triggers.c).
1685 *
1686 * @reg: Adds the trigger to the list of triggers associated with the
1687 * event, and enables the event trigger itself, after
1688 * initializing it (via the event_trigger_ops @init() function).
1689 * This is also where commands can use the @trigger_type value to
1690 * make the decision as to whether or not multiple instances of
1691 * the trigger should be allowed. This is usually implemented by
1692 * the generic utility function @register_trigger() (see
1693 * trace_event_triggers.c).
1694 *
1695 * @unreg: Removes the trigger from the list of triggers associated
1696 * with the event, and disables the event trigger itself, after
1697 * initializing it (via the event_trigger_ops @free() function).
1698 * This is usually implemented by the generic utility function
1699 * @unregister_trigger() (see trace_event_triggers.c).
1700 *
1701 * @unreg_all: An optional function called to remove all the triggers
1702 * from the list of triggers associated with the event. Called
1703 * when a trigger file is opened in truncate mode.
1704 *
1705 * @set_filter: An optional function called to parse and set a filter
1706 * for the trigger. If no @set_filter() method is set for the
1707 * event command, filters set by the user for the command will be
1708 * ignored. This is usually implemented by the generic utility
1709 * function @set_trigger_filter() (see trace_event_triggers.c).
1710 *
1711 * @get_trigger_ops: The callback function invoked to retrieve the
1712 * event_trigger_ops implementation associated with the command.
1713 */
1714 struct event_command {
1715 struct list_head list;
1716 char *name;
1717 enum event_trigger_type trigger_type;
1718 int flags;
1719 int (*func)(struct event_command *cmd_ops,
1720 struct trace_event_file *file,
1721 char *glob, char *cmd, char *params);
1722 int (*reg)(char *glob,
1723 struct event_trigger_ops *ops,
1724 struct event_trigger_data *data,
1725 struct trace_event_file *file);
1726 void (*unreg)(char *glob,
1727 struct event_trigger_ops *ops,
1728 struct event_trigger_data *data,
1729 struct trace_event_file *file);
1730 void (*unreg_all)(struct trace_event_file *file);
1731 int (*set_filter)(char *filter_str,
1732 struct event_trigger_data *data,
1733 struct trace_event_file *file);
1734 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1735 };
1736
1737 /**
1738 * enum event_command_flags - flags for struct event_command
1739 *
1740 * @POST_TRIGGER: A flag that says whether or not this command needs
1741 * to have its action delayed until after the current event has
1742 * been closed. Some triggers need to avoid being invoked while
1743 * an event is currently in the process of being logged, since
1744 * the trigger may itself log data into the trace buffer. Thus
1745 * we make sure the current event is committed before invoking
1746 * those triggers. To do that, the trigger invocation is split
1747 * in two - the first part checks the filter using the current
1748 * trace record; if a command has the @post_trigger flag set, it
1749 * sets a bit for itself in the return value, otherwise it
1750 * directly invokes the trigger. Once all commands have been
1751 * either invoked or set their return flag, the current record is
1752 * either committed or discarded. At that point, if any commands
1753 * have deferred their triggers, those commands are finally
1754 * invoked following the close of the current event. In other
1755 * words, if the event_trigger_ops @func() probe implementation
1756 * itself logs to the trace buffer, this flag should be set,
1757 * otherwise it can be left unspecified.
1758 *
1759 * @NEEDS_REC: A flag that says whether or not this command needs
1760 * access to the trace record in order to perform its function,
1761 * regardless of whether or not it has a filter associated with
1762 * it (filters make a trigger require access to the trace record
1763 * but are not always present).
1764 */
1765 enum event_command_flags {
1766 EVENT_CMD_FL_POST_TRIGGER = 1,
1767 EVENT_CMD_FL_NEEDS_REC = 2,
1768 };
1769
event_command_post_trigger(struct event_command * cmd_ops)1770 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1771 {
1772 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1773 }
1774
event_command_needs_rec(struct event_command * cmd_ops)1775 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1776 {
1777 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1778 }
1779
1780 extern int trace_event_enable_disable(struct trace_event_file *file,
1781 int enable, int soft_disable);
1782 extern int tracing_alloc_snapshot(void);
1783 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1784 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1785
1786 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1787 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1788
1789 extern const char *__start___trace_bprintk_fmt[];
1790 extern const char *__stop___trace_bprintk_fmt[];
1791
1792 extern const char *__start___tracepoint_str[];
1793 extern const char *__stop___tracepoint_str[];
1794
1795 void trace_printk_control(bool enabled);
1796 void trace_printk_start_comm(void);
1797 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1798 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1799
1800 /* Used from boot time tracer */
1801 extern int trace_set_options(struct trace_array *tr, char *option);
1802 extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1803 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1804 unsigned long size, int cpu_id);
1805 extern int tracing_set_cpumask(struct trace_array *tr,
1806 cpumask_var_t tracing_cpumask_new);
1807
1808
1809 #define MAX_EVENT_NAME_LEN 64
1810
1811 extern ssize_t trace_parse_run_command(struct file *file,
1812 const char __user *buffer, size_t count, loff_t *ppos,
1813 int (*createfn)(const char *));
1814
1815 extern unsigned int err_pos(char *cmd, const char *str);
1816 extern void tracing_log_err(struct trace_array *tr,
1817 const char *loc, const char *cmd,
1818 const char **errs, u8 type, u8 pos);
1819
1820 /*
1821 * Normal trace_printk() and friends allocates special buffers
1822 * to do the manipulation, as well as saves the print formats
1823 * into sections to display. But the trace infrastructure wants
1824 * to use these without the added overhead at the price of being
1825 * a bit slower (used mainly for warnings, where we don't care
1826 * about performance). The internal_trace_puts() is for such
1827 * a purpose.
1828 */
1829 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1830
1831 #undef FTRACE_ENTRY
1832 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1833 extern struct trace_event_call \
1834 __aligned(4) event_##call;
1835 #undef FTRACE_ENTRY_DUP
1836 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1837 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1838 #undef FTRACE_ENTRY_PACKED
1839 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1840 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1841
1842 #include "trace_entries.h"
1843
1844 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1845 int perf_ftrace_event_register(struct trace_event_call *call,
1846 enum trace_reg type, void *data);
1847 #else
1848 #define perf_ftrace_event_register NULL
1849 #endif
1850
1851 #ifdef CONFIG_FTRACE_SYSCALLS
1852 void init_ftrace_syscalls(void);
1853 const char *get_syscall_name(int syscall);
1854 #else
init_ftrace_syscalls(void)1855 static inline void init_ftrace_syscalls(void) { }
get_syscall_name(int syscall)1856 static inline const char *get_syscall_name(int syscall)
1857 {
1858 return NULL;
1859 }
1860 #endif
1861
1862 #ifdef CONFIG_EVENT_TRACING
1863 void trace_event_init(void);
1864 void trace_event_eval_update(struct trace_eval_map **map, int len);
1865 /* Used from boot time tracer */
1866 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1867 extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1868 #else
trace_event_init(void)1869 static inline void __init trace_event_init(void) { }
trace_event_eval_update(struct trace_eval_map ** map,int len)1870 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1871 #endif
1872
1873 #ifdef CONFIG_TRACER_SNAPSHOT
1874 void tracing_snapshot_instance(struct trace_array *tr);
1875 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1876 #else
tracing_snapshot_instance(struct trace_array * tr)1877 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
tracing_alloc_snapshot_instance(struct trace_array * tr)1878 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1879 {
1880 return 0;
1881 }
1882 #endif
1883
1884 #ifdef CONFIG_PREEMPT_TRACER
1885 void tracer_preempt_on(unsigned long a0, unsigned long a1);
1886 void tracer_preempt_off(unsigned long a0, unsigned long a1);
1887 #else
tracer_preempt_on(unsigned long a0,unsigned long a1)1888 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
tracer_preempt_off(unsigned long a0,unsigned long a1)1889 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1890 #endif
1891 #ifdef CONFIG_IRQSOFF_TRACER
1892 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1893 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1894 #else
tracer_hardirqs_on(unsigned long a0,unsigned long a1)1895 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
tracer_hardirqs_off(unsigned long a0,unsigned long a1)1896 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1897 #endif
1898
1899 extern struct trace_iterator *tracepoint_print_iter;
1900
1901 /*
1902 * Reset the state of the trace_iterator so that it can read consumed data.
1903 * Normally, the trace_iterator is used for reading the data when it is not
1904 * consumed, and must retain state.
1905 */
trace_iterator_reset(struct trace_iterator * iter)1906 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1907 {
1908 const size_t offset = offsetof(struct trace_iterator, seq);
1909
1910 /*
1911 * Keep gcc from complaining about overwriting more than just one
1912 * member in the structure.
1913 */
1914 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1915
1916 iter->pos = -1;
1917 }
1918
1919 /* Check the name is good for event/group/fields */
is_good_name(const char * name)1920 static inline bool is_good_name(const char *name)
1921 {
1922 if (!isalpha(*name) && *name != '_')
1923 return false;
1924 while (*++name != '\0') {
1925 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1926 return false;
1927 }
1928 return true;
1929 }
1930
1931 /* Convert certain expected symbols into '_' when generating event names */
sanitize_event_name(char * name)1932 static inline void sanitize_event_name(char *name)
1933 {
1934 while (*name++ != '\0')
1935 if (*name == ':' || *name == '.')
1936 *name = '_';
1937 }
1938
1939 /*
1940 * This is a generic way to read and write a u64 value from a file in tracefs.
1941 *
1942 * The value is stored on the variable pointed by *val. The value needs
1943 * to be at least *min and at most *max. The write is protected by an
1944 * existing *lock.
1945 */
1946 struct trace_min_max_param {
1947 struct mutex *lock;
1948 u64 *val;
1949 u64 *min;
1950 u64 *max;
1951 };
1952
1953 #define U64_STR_SIZE 24 /* 20 digits max */
1954
1955 extern const struct file_operations trace_min_max_fops;
1956
1957 #endif /* _LINUX_KERNEL_TRACE_H */
1958
