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
35 enum 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 */
136 struct syscall_trace_enter {
137 struct trace_entry ent;
138 int nr;
139 unsigned long args[];
140 };
141
142 struct syscall_trace_exit {
143 struct trace_entry ent;
144 int nr;
145 long ret;
146 };
147
148 struct kprobe_trace_entry_head {
149 struct trace_entry ent;
150 unsigned long ip;
151 };
152
153 struct eprobe_trace_entry_head {
154 struct trace_entry ent;
155 };
156
157 struct kretprobe_trace_entry_head {
158 struct trace_entry ent;
159 unsigned long func;
160 unsigned long ret_ip;
161 };
162
163 struct fentry_trace_entry_head {
164 struct trace_entry ent;
165 unsigned long ip;
166 };
167
168 struct 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
176 struct 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 */
183 struct 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
207 struct tracer;
208 struct trace_option_dentry;
209
210 struct 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
220 struct trace_options {
221 struct tracer *tracer;
222 struct trace_option_dentry *topts;
223 };
224
225 struct trace_pid_list *trace_pid_list_alloc(void);
226 void trace_pid_list_free(struct trace_pid_list *pid_list);
227 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
228 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
229 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
230 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid);
231 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
232 unsigned int *next);
233
234 enum {
235 TRACE_PIDS = BIT(0),
236 TRACE_NO_PIDS = BIT(1),
237 };
238
pid_type_enabled(int type,struct trace_pid_list * pid_list,struct trace_pid_list * no_pid_list)239 static 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
still_need_pid_events(int type,struct trace_pid_list * pid_list,struct trace_pid_list * no_pid_list)247 static 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
258 typedef 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 */
298 struct 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 */
307 struct 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 */
319 struct 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 spinlock_t snapshot_trigger_lock;
338 unsigned int snapshot;
339 unsigned int mapped;
340 unsigned long max_latency;
341 #ifdef CONFIG_FSNOTIFY
342 struct dentry *d_max_latency;
343 struct work_struct fsnotify_work;
344 struct irq_work fsnotify_irqwork;
345 #endif
346 #endif
347 struct trace_pid_list __rcu *filtered_pids;
348 struct trace_pid_list __rcu *filtered_no_pids;
349 /*
350 * max_lock is used to protect the swapping of buffers
351 * when taking a max snapshot. The buffers themselves are
352 * protected by per_cpu spinlocks. But the action of the swap
353 * needs its own lock.
354 *
355 * This is defined as a arch_spinlock_t in order to help
356 * with performance when lockdep debugging is enabled.
357 *
358 * It is also used in other places outside the update_max_tr
359 * so it needs to be defined outside of the
360 * CONFIG_TRACER_MAX_TRACE.
361 */
362 arch_spinlock_t max_lock;
363 int buffer_disabled;
364 #ifdef CONFIG_FTRACE_SYSCALLS
365 int sys_refcount_enter;
366 int sys_refcount_exit;
367 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
368 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
369 #endif
370 int stop_count;
371 int clock_id;
372 int nr_topts;
373 bool clear_trace;
374 int buffer_percent;
375 unsigned int n_err_log_entries;
376 struct tracer *current_trace;
377 unsigned int trace_flags;
378 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
379 unsigned int flags;
380 raw_spinlock_t start_lock;
381 const char *system_names;
382 struct list_head err_log;
383 struct dentry *dir;
384 struct dentry *options;
385 struct dentry *percpu_dir;
386 struct eventfs_inode *event_dir;
387 struct trace_options *topts;
388 struct list_head systems;
389 struct list_head events;
390 struct trace_event_file *trace_marker_file;
391 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
392 /* one per_cpu trace_pipe can be opened by only one user */
393 cpumask_var_t pipe_cpumask;
394 int ref;
395 int trace_ref;
396 #ifdef CONFIG_FUNCTION_TRACER
397 struct ftrace_ops *ops;
398 struct trace_pid_list __rcu *function_pids;
399 struct trace_pid_list __rcu *function_no_pids;
400 #ifdef CONFIG_DYNAMIC_FTRACE
401 /* All of these are protected by the ftrace_lock */
402 struct list_head func_probes;
403 struct list_head mod_trace;
404 struct list_head mod_notrace;
405 #endif
406 /* function tracing enabled */
407 int function_enabled;
408 #endif
409 int no_filter_buffering_ref;
410 struct list_head hist_vars;
411 #ifdef CONFIG_TRACER_SNAPSHOT
412 struct cond_snapshot *cond_snapshot;
413 #endif
414 struct trace_func_repeats __percpu *last_func_repeats;
415 /*
416 * On boot up, the ring buffer is set to the minimum size, so that
417 * we do not waste memory on systems that are not using tracing.
418 */
419 bool ring_buffer_expanded;
420 };
421
422 enum {
423 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
424 };
425
426 extern struct list_head ftrace_trace_arrays;
427
428 extern struct mutex trace_types_lock;
429
430 extern int trace_array_get(struct trace_array *tr);
431 extern int tracing_check_open_get_tr(struct trace_array *tr);
432 extern struct trace_array *trace_array_find(const char *instance);
433 extern struct trace_array *trace_array_find_get(const char *instance);
434
435 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
436 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
437 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
438
439 extern bool trace_clock_in_ns(struct trace_array *tr);
440
441 /*
442 * The global tracer (top) should be the first trace array added,
443 * but we check the flag anyway.
444 */
top_trace_array(void)445 static inline struct trace_array *top_trace_array(void)
446 {
447 struct trace_array *tr;
448
449 if (list_empty(&ftrace_trace_arrays))
450 return NULL;
451
452 tr = list_entry(ftrace_trace_arrays.prev,
453 typeof(*tr), list);
454 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
455 return tr;
456 }
457
458 #define FTRACE_CMP_TYPE(var, type) \
459 __builtin_types_compatible_p(typeof(var), type *)
460
461 #undef IF_ASSIGN
462 #define IF_ASSIGN(var, entry, etype, id) \
463 if (FTRACE_CMP_TYPE(var, etype)) { \
464 var = (typeof(var))(entry); \
465 WARN_ON(id != 0 && (entry)->type != id); \
466 break; \
467 }
468
469 /* Will cause compile errors if type is not found. */
470 extern void __ftrace_bad_type(void);
471
472 /*
473 * The trace_assign_type is a verifier that the entry type is
474 * the same as the type being assigned. To add new types simply
475 * add a line with the following format:
476 *
477 * IF_ASSIGN(var, ent, type, id);
478 *
479 * Where "type" is the trace type that includes the trace_entry
480 * as the "ent" item. And "id" is the trace identifier that is
481 * used in the trace_type enum.
482 *
483 * If the type can have more than one id, then use zero.
484 */
485 #define trace_assign_type(var, ent) \
486 do { \
487 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
488 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
489 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
490 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
491 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
492 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
493 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
494 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
495 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
496 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
497 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
498 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
499 TRACE_MMIO_RW); \
500 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
501 TRACE_MMIO_MAP); \
502 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
503 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
504 TRACE_GRAPH_ENT); \
505 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
506 TRACE_GRAPH_RET); \
507 IF_ASSIGN(var, ent, struct func_repeats_entry, \
508 TRACE_FUNC_REPEATS); \
509 __ftrace_bad_type(); \
510 } while (0)
511
512 /*
513 * An option specific to a tracer. This is a boolean value.
514 * The bit is the bit index that sets its value on the
515 * flags value in struct tracer_flags.
516 */
517 struct tracer_opt {
518 const char *name; /* Will appear on the trace_options file */
519 u32 bit; /* Mask assigned in val field in tracer_flags */
520 };
521
522 /*
523 * The set of specific options for a tracer. Your tracer
524 * have to set the initial value of the flags val.
525 */
526 struct tracer_flags {
527 u32 val;
528 struct tracer_opt *opts;
529 struct tracer *trace;
530 };
531
532 /* Makes more easy to define a tracer opt */
533 #define TRACER_OPT(s, b) .name = #s, .bit = b
534
535
536 struct trace_option_dentry {
537 struct tracer_opt *opt;
538 struct tracer_flags *flags;
539 struct trace_array *tr;
540 struct dentry *entry;
541 };
542
543 /**
544 * struct tracer - a specific tracer and its callbacks to interact with tracefs
545 * @name: the name chosen to select it on the available_tracers file
546 * @init: called when one switches to this tracer (echo name > current_tracer)
547 * @reset: called when one switches to another tracer
548 * @start: called when tracing is unpaused (echo 1 > tracing_on)
549 * @stop: called when tracing is paused (echo 0 > tracing_on)
550 * @update_thresh: called when tracing_thresh is updated
551 * @open: called when the trace file is opened
552 * @pipe_open: called when the trace_pipe file is opened
553 * @close: called when the trace file is released
554 * @pipe_close: called when the trace_pipe file is released
555 * @read: override the default read callback on trace_pipe
556 * @splice_read: override the default splice_read callback on trace_pipe
557 * @selftest: selftest to run on boot (see trace_selftest.c)
558 * @print_headers: override the first lines that describe your columns
559 * @print_line: callback that prints a trace
560 * @set_flag: signals one of your private flags changed (trace_options file)
561 * @flags: your private flags
562 */
563 struct tracer {
564 const char *name;
565 int (*init)(struct trace_array *tr);
566 void (*reset)(struct trace_array *tr);
567 void (*start)(struct trace_array *tr);
568 void (*stop)(struct trace_array *tr);
569 int (*update_thresh)(struct trace_array *tr);
570 void (*open)(struct trace_iterator *iter);
571 void (*pipe_open)(struct trace_iterator *iter);
572 void (*close)(struct trace_iterator *iter);
573 void (*pipe_close)(struct trace_iterator *iter);
574 ssize_t (*read)(struct trace_iterator *iter,
575 struct file *filp, char __user *ubuf,
576 size_t cnt, loff_t *ppos);
577 ssize_t (*splice_read)(struct trace_iterator *iter,
578 struct file *filp,
579 loff_t *ppos,
580 struct pipe_inode_info *pipe,
581 size_t len,
582 unsigned int flags);
583 #ifdef CONFIG_FTRACE_STARTUP_TEST
584 int (*selftest)(struct tracer *trace,
585 struct trace_array *tr);
586 #endif
587 void (*print_header)(struct seq_file *m);
588 enum print_line_t (*print_line)(struct trace_iterator *iter);
589 /* If you handled the flag setting, return 0 */
590 int (*set_flag)(struct trace_array *tr,
591 u32 old_flags, u32 bit, int set);
592 /* Return 0 if OK with change, else return non-zero */
593 int (*flag_changed)(struct trace_array *tr,
594 u32 mask, int set);
595 struct tracer *next;
596 struct tracer_flags *flags;
597 int enabled;
598 bool print_max;
599 bool allow_instances;
600 #ifdef CONFIG_TRACER_MAX_TRACE
601 bool use_max_tr;
602 #endif
603 /* True if tracer cannot be enabled in kernel param */
604 bool noboot;
605 };
606
607 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)608 trace_buffer_iter(struct trace_iterator *iter, int cpu)
609 {
610 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
611 }
612
613 int tracer_init(struct tracer *t, struct trace_array *tr);
614 int tracing_is_enabled(void);
615 void tracing_reset_online_cpus(struct array_buffer *buf);
616 void tracing_reset_all_online_cpus(void);
617 void tracing_reset_all_online_cpus_unlocked(void);
618 int tracing_open_generic(struct inode *inode, struct file *filp);
619 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
620 int tracing_release_generic_tr(struct inode *inode, struct file *file);
621 int tracing_open_file_tr(struct inode *inode, struct file *filp);
622 int tracing_release_file_tr(struct inode *inode, struct file *filp);
623 int tracing_single_release_file_tr(struct inode *inode, struct file *filp);
624 bool tracing_is_disabled(void);
625 bool tracer_tracing_is_on(struct trace_array *tr);
626 void tracer_tracing_on(struct trace_array *tr);
627 void tracer_tracing_off(struct trace_array *tr);
628 struct dentry *trace_create_file(const char *name,
629 umode_t mode,
630 struct dentry *parent,
631 void *data,
632 const struct file_operations *fops);
633
634 int tracing_init_dentry(void);
635
636 struct ring_buffer_event;
637
638 struct ring_buffer_event *
639 trace_buffer_lock_reserve(struct trace_buffer *buffer,
640 int type,
641 unsigned long len,
642 unsigned int trace_ctx);
643
644 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
645 struct trace_array_cpu *data);
646
647 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
648 int *ent_cpu, u64 *ent_ts);
649
650 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
651 struct ring_buffer_event *event);
652
653 bool trace_is_tracepoint_string(const char *str);
654 const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
655 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
656 va_list ap) __printf(2, 0);
657 char *trace_iter_expand_format(struct trace_iterator *iter);
658
659 int trace_empty(struct trace_iterator *iter);
660
661 void *trace_find_next_entry_inc(struct trace_iterator *iter);
662
663 void trace_init_global_iter(struct trace_iterator *iter);
664
665 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
666
667 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
668 unsigned long trace_total_entries(struct trace_array *tr);
669
670 void trace_function(struct trace_array *tr,
671 unsigned long ip,
672 unsigned long parent_ip,
673 unsigned int trace_ctx);
674 void trace_graph_function(struct trace_array *tr,
675 unsigned long ip,
676 unsigned long parent_ip,
677 unsigned int trace_ctx);
678 void trace_latency_header(struct seq_file *m);
679 void trace_default_header(struct seq_file *m);
680 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
681
682 void trace_graph_return(struct ftrace_graph_ret *trace);
683 int trace_graph_entry(struct ftrace_graph_ent *trace);
684 void set_graph_array(struct trace_array *tr);
685
686 void tracing_start_cmdline_record(void);
687 void tracing_stop_cmdline_record(void);
688 void tracing_start_tgid_record(void);
689 void tracing_stop_tgid_record(void);
690
691 int register_tracer(struct tracer *type);
692 int is_tracing_stopped(void);
693
694 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
695
696 extern cpumask_var_t __read_mostly tracing_buffer_mask;
697
698 #define for_each_tracing_cpu(cpu) \
699 for_each_cpu(cpu, tracing_buffer_mask)
700
701 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
702
703 extern unsigned long tracing_thresh;
704
705 /* PID filtering */
706
707 extern int pid_max;
708
709 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
710 pid_t search_pid);
711 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
712 struct trace_pid_list *filtered_no_pids,
713 struct task_struct *task);
714 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
715 struct task_struct *self,
716 struct task_struct *task);
717 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
718 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
719 int trace_pid_show(struct seq_file *m, void *v);
720 int trace_pid_write(struct trace_pid_list *filtered_pids,
721 struct trace_pid_list **new_pid_list,
722 const char __user *ubuf, size_t cnt);
723
724 #ifdef CONFIG_TRACER_MAX_TRACE
725 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
726 void *cond_data);
727 void update_max_tr_single(struct trace_array *tr,
728 struct task_struct *tsk, int cpu);
729
730 #ifdef CONFIG_FSNOTIFY
731 #define LATENCY_FS_NOTIFY
732 #endif
733 #endif /* CONFIG_TRACER_MAX_TRACE */
734
735 #ifdef LATENCY_FS_NOTIFY
736 void latency_fsnotify(struct trace_array *tr);
737 #else
latency_fsnotify(struct trace_array * tr)738 static inline void latency_fsnotify(struct trace_array *tr) { }
739 #endif
740
741 #ifdef CONFIG_STACKTRACE
742 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
743 #else
__trace_stack(struct trace_array * tr,unsigned int trace_ctx,int skip)744 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
745 int skip)
746 {
747 }
748 #endif /* CONFIG_STACKTRACE */
749
750 void trace_last_func_repeats(struct trace_array *tr,
751 struct trace_func_repeats *last_info,
752 unsigned int trace_ctx);
753
754 extern u64 ftrace_now(int cpu);
755
756 extern void trace_find_cmdline(int pid, char comm[]);
757 extern int trace_find_tgid(int pid);
758 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
759
760 #ifdef CONFIG_DYNAMIC_FTRACE
761 extern unsigned long ftrace_update_tot_cnt;
762 extern unsigned long ftrace_number_of_pages;
763 extern unsigned long ftrace_number_of_groups;
764 void ftrace_init_trace_array(struct trace_array *tr);
765 #else
ftrace_init_trace_array(struct trace_array * tr)766 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
767 #endif
768 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
769 extern int DYN_FTRACE_TEST_NAME(void);
770 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
771 extern int DYN_FTRACE_TEST_NAME2(void);
772
773 extern void trace_set_ring_buffer_expanded(struct trace_array *tr);
774 extern bool tracing_selftest_disabled;
775
776 #ifdef CONFIG_FTRACE_STARTUP_TEST
777 extern void __init disable_tracing_selftest(const char *reason);
778
779 extern int trace_selftest_startup_function(struct tracer *trace,
780 struct trace_array *tr);
781 extern int trace_selftest_startup_function_graph(struct tracer *trace,
782 struct trace_array *tr);
783 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
784 struct trace_array *tr);
785 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
786 struct trace_array *tr);
787 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
788 struct trace_array *tr);
789 extern int trace_selftest_startup_wakeup(struct tracer *trace,
790 struct trace_array *tr);
791 extern int trace_selftest_startup_nop(struct tracer *trace,
792 struct trace_array *tr);
793 extern int trace_selftest_startup_branch(struct tracer *trace,
794 struct trace_array *tr);
795 /*
796 * Tracer data references selftest functions that only occur
797 * on boot up. These can be __init functions. Thus, when selftests
798 * are enabled, then the tracers need to reference __init functions.
799 */
800 #define __tracer_data __refdata
801 #else
disable_tracing_selftest(const char * reason)802 static inline void __init disable_tracing_selftest(const char *reason)
803 {
804 }
805 /* Tracers are seldom changed. Optimize when selftests are disabled. */
806 #define __tracer_data __read_mostly
807 #endif /* CONFIG_FTRACE_STARTUP_TEST */
808
809 extern void *head_page(struct trace_array_cpu *data);
810 extern unsigned long long ns2usecs(u64 nsec);
811 extern int
812 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
813 extern int
814 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
815 extern int
816 trace_array_vprintk(struct trace_array *tr,
817 unsigned long ip, const char *fmt, va_list args);
818 int trace_array_printk_buf(struct trace_buffer *buffer,
819 unsigned long ip, const char *fmt, ...);
820 void trace_printk_seq(struct trace_seq *s);
821 enum print_line_t print_trace_line(struct trace_iterator *iter);
822
823 extern char trace_find_mark(unsigned long long duration);
824
825 struct ftrace_hash;
826
827 struct ftrace_mod_load {
828 struct list_head list;
829 char *func;
830 char *module;
831 int enable;
832 };
833
834 enum {
835 FTRACE_HASH_FL_MOD = (1 << 0),
836 };
837
838 struct ftrace_hash {
839 unsigned long size_bits;
840 struct hlist_head *buckets;
841 unsigned long count;
842 unsigned long flags;
843 struct rcu_head rcu;
844 };
845
846 struct ftrace_func_entry *
847 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
848
ftrace_hash_empty(struct ftrace_hash * hash)849 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
850 {
851 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
852 }
853
854 /* Standard output formatting function used for function return traces */
855 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
856
857 /* Flag options */
858 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
859 #define TRACE_GRAPH_PRINT_CPU 0x2
860 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
861 #define TRACE_GRAPH_PRINT_PROC 0x8
862 #define TRACE_GRAPH_PRINT_DURATION 0x10
863 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
864 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
865 #define TRACE_GRAPH_PRINT_IRQS 0x80
866 #define TRACE_GRAPH_PRINT_TAIL 0x100
867 #define TRACE_GRAPH_SLEEP_TIME 0x200
868 #define TRACE_GRAPH_GRAPH_TIME 0x400
869 #define TRACE_GRAPH_PRINT_RETVAL 0x800
870 #define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000
871 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
872 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
873
874 extern void ftrace_graph_sleep_time_control(bool enable);
875
876 #ifdef CONFIG_FUNCTION_PROFILER
877 extern void ftrace_graph_graph_time_control(bool enable);
878 #else
ftrace_graph_graph_time_control(bool enable)879 static inline void ftrace_graph_graph_time_control(bool enable) { }
880 #endif
881
882 extern enum print_line_t
883 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
884 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
885 extern void
886 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
887 extern void graph_trace_open(struct trace_iterator *iter);
888 extern void graph_trace_close(struct trace_iterator *iter);
889 extern int __trace_graph_entry(struct trace_array *tr,
890 struct ftrace_graph_ent *trace,
891 unsigned int trace_ctx);
892 extern void __trace_graph_return(struct trace_array *tr,
893 struct ftrace_graph_ret *trace,
894 unsigned int trace_ctx);
895
896 #ifdef CONFIG_DYNAMIC_FTRACE
897 extern struct ftrace_hash __rcu *ftrace_graph_hash;
898 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
899
ftrace_graph_addr(struct ftrace_graph_ent * trace)900 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
901 {
902 unsigned long addr = trace->func;
903 int ret = 0;
904 struct ftrace_hash *hash;
905
906 preempt_disable_notrace();
907
908 /*
909 * Have to open code "rcu_dereference_sched()" because the
910 * function graph tracer can be called when RCU is not
911 * "watching".
912 * Protected with schedule_on_each_cpu(ftrace_sync)
913 */
914 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
915
916 if (ftrace_hash_empty(hash)) {
917 ret = 1;
918 goto out;
919 }
920
921 if (ftrace_lookup_ip(hash, addr)) {
922
923 /*
924 * This needs to be cleared on the return functions
925 * when the depth is zero.
926 */
927 trace_recursion_set(TRACE_GRAPH_BIT);
928 trace_recursion_set_depth(trace->depth);
929
930 /*
931 * If no irqs are to be traced, but a set_graph_function
932 * is set, and called by an interrupt handler, we still
933 * want to trace it.
934 */
935 if (in_hardirq())
936 trace_recursion_set(TRACE_IRQ_BIT);
937 else
938 trace_recursion_clear(TRACE_IRQ_BIT);
939 ret = 1;
940 }
941
942 out:
943 preempt_enable_notrace();
944 return ret;
945 }
946
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)947 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
948 {
949 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
950 trace->depth == trace_recursion_depth())
951 trace_recursion_clear(TRACE_GRAPH_BIT);
952 }
953
ftrace_graph_notrace_addr(unsigned long addr)954 static inline int ftrace_graph_notrace_addr(unsigned long addr)
955 {
956 int ret = 0;
957 struct ftrace_hash *notrace_hash;
958
959 preempt_disable_notrace();
960
961 /*
962 * Have to open code "rcu_dereference_sched()" because the
963 * function graph tracer can be called when RCU is not
964 * "watching".
965 * Protected with schedule_on_each_cpu(ftrace_sync)
966 */
967 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
968 !preemptible());
969
970 if (ftrace_lookup_ip(notrace_hash, addr))
971 ret = 1;
972
973 preempt_enable_notrace();
974 return ret;
975 }
976 #else
ftrace_graph_addr(struct ftrace_graph_ent * trace)977 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
978 {
979 return 1;
980 }
981
ftrace_graph_notrace_addr(unsigned long addr)982 static inline int ftrace_graph_notrace_addr(unsigned long addr)
983 {
984 return 0;
985 }
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)986 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
987 { }
988 #endif /* CONFIG_DYNAMIC_FTRACE */
989
990 extern unsigned int fgraph_max_depth;
991
ftrace_graph_ignore_func(struct ftrace_graph_ent * trace)992 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
993 {
994 /* trace it when it is-nested-in or is a function enabled. */
995 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
996 ftrace_graph_addr(trace)) ||
997 (trace->depth < 0) ||
998 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
999 }
1000
1001 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
1002 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)1003 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1004 {
1005 return TRACE_TYPE_UNHANDLED;
1006 }
1007 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1008
1009 extern struct list_head ftrace_pids;
1010
1011 #ifdef CONFIG_FUNCTION_TRACER
1012
1013 #define FTRACE_PID_IGNORE -1
1014 #define FTRACE_PID_TRACE -2
1015
1016 struct ftrace_func_command {
1017 struct list_head list;
1018 char *name;
1019 int (*func)(struct trace_array *tr,
1020 struct ftrace_hash *hash,
1021 char *func, char *cmd,
1022 char *params, int enable);
1023 };
1024 extern bool ftrace_filter_param __initdata;
ftrace_trace_task(struct trace_array * tr)1025 static inline int ftrace_trace_task(struct trace_array *tr)
1026 {
1027 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
1028 FTRACE_PID_IGNORE;
1029 }
1030 extern int ftrace_is_dead(void);
1031 int ftrace_create_function_files(struct trace_array *tr,
1032 struct dentry *parent);
1033 void ftrace_destroy_function_files(struct trace_array *tr);
1034 int ftrace_allocate_ftrace_ops(struct trace_array *tr);
1035 void ftrace_free_ftrace_ops(struct trace_array *tr);
1036 void ftrace_init_global_array_ops(struct trace_array *tr);
1037 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1038 void ftrace_reset_array_ops(struct trace_array *tr);
1039 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1040 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1041 struct dentry *d_tracer);
1042 void ftrace_clear_pids(struct trace_array *tr);
1043 int init_function_trace(void);
1044 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1045 #else
ftrace_trace_task(struct trace_array * tr)1046 static inline int ftrace_trace_task(struct trace_array *tr)
1047 {
1048 return 1;
1049 }
ftrace_is_dead(void)1050 static inline int ftrace_is_dead(void) { return 0; }
1051 static inline int
ftrace_create_function_files(struct trace_array * tr,struct dentry * parent)1052 ftrace_create_function_files(struct trace_array *tr,
1053 struct dentry *parent)
1054 {
1055 return 0;
1056 }
ftrace_allocate_ftrace_ops(struct trace_array * tr)1057 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1058 {
1059 return 0;
1060 }
ftrace_free_ftrace_ops(struct trace_array * tr)1061 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
ftrace_destroy_function_files(struct trace_array * tr)1062 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1063 static inline __init void
ftrace_init_global_array_ops(struct trace_array * tr)1064 ftrace_init_global_array_ops(struct trace_array *tr) { }
ftrace_reset_array_ops(struct trace_array * tr)1065 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
ftrace_init_tracefs(struct trace_array * tr,struct dentry * d)1066 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
ftrace_init_tracefs_toplevel(struct trace_array * tr,struct dentry * d)1067 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
ftrace_clear_pids(struct trace_array * tr)1068 static inline void ftrace_clear_pids(struct trace_array *tr) { }
init_function_trace(void)1069 static inline int init_function_trace(void) { return 0; }
ftrace_pid_follow_fork(struct trace_array * tr,bool enable)1070 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1071 /* ftace_func_t type is not defined, use macro instead of static inline */
1072 #define ftrace_init_array_ops(tr, func) do { } while (0)
1073 #endif /* CONFIG_FUNCTION_TRACER */
1074
1075 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1076
1077 struct ftrace_probe_ops {
1078 void (*func)(unsigned long ip,
1079 unsigned long parent_ip,
1080 struct trace_array *tr,
1081 struct ftrace_probe_ops *ops,
1082 void *data);
1083 int (*init)(struct ftrace_probe_ops *ops,
1084 struct trace_array *tr,
1085 unsigned long ip, void *init_data,
1086 void **data);
1087 void (*free)(struct ftrace_probe_ops *ops,
1088 struct trace_array *tr,
1089 unsigned long ip, void *data);
1090 int (*print)(struct seq_file *m,
1091 unsigned long ip,
1092 struct ftrace_probe_ops *ops,
1093 void *data);
1094 };
1095
1096 struct ftrace_func_mapper;
1097 typedef int (*ftrace_mapper_func)(void *data);
1098
1099 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1100 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1101 unsigned long ip);
1102 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1103 unsigned long ip, void *data);
1104 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1105 unsigned long ip);
1106 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1107 ftrace_mapper_func free_func);
1108
1109 extern int
1110 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1111 struct ftrace_probe_ops *ops, void *data);
1112 extern int
1113 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1114 struct ftrace_probe_ops *ops);
1115 extern void clear_ftrace_function_probes(struct trace_array *tr);
1116
1117 int register_ftrace_command(struct ftrace_func_command *cmd);
1118 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1119
1120 void ftrace_create_filter_files(struct ftrace_ops *ops,
1121 struct dentry *parent);
1122 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1123
1124 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1125 int len, int reset);
1126 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1127 int len, int reset);
1128 #else
1129 struct ftrace_func_command;
1130
register_ftrace_command(struct ftrace_func_command * cmd)1131 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1132 {
1133 return -EINVAL;
1134 }
unregister_ftrace_command(char * cmd_name)1135 static inline __init int unregister_ftrace_command(char *cmd_name)
1136 {
1137 return -EINVAL;
1138 }
clear_ftrace_function_probes(struct trace_array * tr)1139 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1140 {
1141 }
1142
1143 /*
1144 * The ops parameter passed in is usually undefined.
1145 * This must be a macro.
1146 */
1147 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1148 #define ftrace_destroy_filter_files(ops) do { } while (0)
1149 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1150
1151 bool ftrace_event_is_function(struct trace_event_call *call);
1152
1153 /*
1154 * struct trace_parser - servers for reading the user input separated by spaces
1155 * @cont: set if the input is not complete - no final space char was found
1156 * @buffer: holds the parsed user input
1157 * @idx: user input length
1158 * @size: buffer size
1159 */
1160 struct trace_parser {
1161 bool cont;
1162 char *buffer;
1163 unsigned idx;
1164 unsigned size;
1165 };
1166
trace_parser_loaded(struct trace_parser * parser)1167 static inline bool trace_parser_loaded(struct trace_parser *parser)
1168 {
1169 return (parser->idx != 0);
1170 }
1171
trace_parser_cont(struct trace_parser * parser)1172 static inline bool trace_parser_cont(struct trace_parser *parser)
1173 {
1174 return parser->cont;
1175 }
1176
trace_parser_clear(struct trace_parser * parser)1177 static inline void trace_parser_clear(struct trace_parser *parser)
1178 {
1179 parser->cont = false;
1180 parser->idx = 0;
1181 }
1182
1183 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1184 extern void trace_parser_put(struct trace_parser *parser);
1185 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1186 size_t cnt, loff_t *ppos);
1187
1188 /*
1189 * Only create function graph options if function graph is configured.
1190 */
1191 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1192 # define FGRAPH_FLAGS \
1193 C(DISPLAY_GRAPH, "display-graph"),
1194 #else
1195 # define FGRAPH_FLAGS
1196 #endif
1197
1198 #ifdef CONFIG_BRANCH_TRACER
1199 # define BRANCH_FLAGS \
1200 C(BRANCH, "branch"),
1201 #else
1202 # define BRANCH_FLAGS
1203 #endif
1204
1205 #ifdef CONFIG_FUNCTION_TRACER
1206 # define FUNCTION_FLAGS \
1207 C(FUNCTION, "function-trace"), \
1208 C(FUNC_FORK, "function-fork"),
1209 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1210 #else
1211 # define FUNCTION_FLAGS
1212 # define FUNCTION_DEFAULT_FLAGS 0UL
1213 # define TRACE_ITER_FUNC_FORK 0UL
1214 #endif
1215
1216 #ifdef CONFIG_STACKTRACE
1217 # define STACK_FLAGS \
1218 C(STACKTRACE, "stacktrace"),
1219 #else
1220 # define STACK_FLAGS
1221 #endif
1222
1223 /*
1224 * trace_iterator_flags is an enumeration that defines bit
1225 * positions into trace_flags that controls the output.
1226 *
1227 * NOTE: These bits must match the trace_options array in
1228 * trace.c (this macro guarantees it).
1229 */
1230 #define TRACE_FLAGS \
1231 C(PRINT_PARENT, "print-parent"), \
1232 C(SYM_OFFSET, "sym-offset"), \
1233 C(SYM_ADDR, "sym-addr"), \
1234 C(VERBOSE, "verbose"), \
1235 C(RAW, "raw"), \
1236 C(HEX, "hex"), \
1237 C(BIN, "bin"), \
1238 C(BLOCK, "block"), \
1239 C(FIELDS, "fields"), \
1240 C(PRINTK, "trace_printk"), \
1241 C(ANNOTATE, "annotate"), \
1242 C(USERSTACKTRACE, "userstacktrace"), \
1243 C(SYM_USEROBJ, "sym-userobj"), \
1244 C(PRINTK_MSGONLY, "printk-msg-only"), \
1245 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1246 C(LATENCY_FMT, "latency-format"), \
1247 C(RECORD_CMD, "record-cmd"), \
1248 C(RECORD_TGID, "record-tgid"), \
1249 C(OVERWRITE, "overwrite"), \
1250 C(STOP_ON_FREE, "disable_on_free"), \
1251 C(IRQ_INFO, "irq-info"), \
1252 C(MARKERS, "markers"), \
1253 C(EVENT_FORK, "event-fork"), \
1254 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1255 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1256 FUNCTION_FLAGS \
1257 FGRAPH_FLAGS \
1258 STACK_FLAGS \
1259 BRANCH_FLAGS
1260
1261 /*
1262 * By defining C, we can make TRACE_FLAGS a list of bit names
1263 * that will define the bits for the flag masks.
1264 */
1265 #undef C
1266 #define C(a, b) TRACE_ITER_##a##_BIT
1267
1268 enum trace_iterator_bits {
1269 TRACE_FLAGS
1270 /* Make sure we don't go more than we have bits for */
1271 TRACE_ITER_LAST_BIT
1272 };
1273
1274 /*
1275 * By redefining C, we can make TRACE_FLAGS a list of masks that
1276 * use the bits as defined above.
1277 */
1278 #undef C
1279 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1280
1281 enum trace_iterator_flags { TRACE_FLAGS };
1282
1283 /*
1284 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1285 * control the output of kernel symbols.
1286 */
1287 #define TRACE_ITER_SYM_MASK \
1288 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1289
1290 extern struct tracer nop_trace;
1291
1292 #ifdef CONFIG_BRANCH_TRACER
1293 extern int enable_branch_tracing(struct trace_array *tr);
1294 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)1295 static inline int trace_branch_enable(struct trace_array *tr)
1296 {
1297 if (tr->trace_flags & TRACE_ITER_BRANCH)
1298 return enable_branch_tracing(tr);
1299 return 0;
1300 }
trace_branch_disable(void)1301 static inline void trace_branch_disable(void)
1302 {
1303 /* due to races, always disable */
1304 disable_branch_tracing();
1305 }
1306 #else
trace_branch_enable(struct trace_array * tr)1307 static inline int trace_branch_enable(struct trace_array *tr)
1308 {
1309 return 0;
1310 }
trace_branch_disable(void)1311 static inline void trace_branch_disable(void)
1312 {
1313 }
1314 #endif /* CONFIG_BRANCH_TRACER */
1315
1316 /* set ring buffers to default size if not already done so */
1317 int tracing_update_buffers(struct trace_array *tr);
1318
1319 union trace_synth_field {
1320 u8 as_u8;
1321 u16 as_u16;
1322 u32 as_u32;
1323 u64 as_u64;
1324 struct trace_dynamic_info as_dynamic;
1325 };
1326
1327 struct ftrace_event_field {
1328 struct list_head link;
1329 const char *name;
1330 const char *type;
1331 int filter_type;
1332 int offset;
1333 int size;
1334 int is_signed;
1335 int len;
1336 };
1337
1338 struct prog_entry;
1339
1340 struct event_filter {
1341 struct prog_entry __rcu *prog;
1342 char *filter_string;
1343 };
1344
1345 struct event_subsystem {
1346 struct list_head list;
1347 const char *name;
1348 struct event_filter *filter;
1349 int ref_count;
1350 };
1351
1352 struct trace_subsystem_dir {
1353 struct list_head list;
1354 struct event_subsystem *subsystem;
1355 struct trace_array *tr;
1356 struct eventfs_inode *ei;
1357 int ref_count;
1358 int nr_events;
1359 };
1360
1361 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1362 struct trace_buffer *buffer,
1363 struct ring_buffer_event *event);
1364
1365 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1366 struct trace_buffer *buffer,
1367 struct ring_buffer_event *event,
1368 unsigned int trcace_ctx,
1369 struct pt_regs *regs);
1370
trace_buffer_unlock_commit(struct trace_array * tr,struct trace_buffer * buffer,struct ring_buffer_event * event,unsigned int trace_ctx)1371 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1372 struct trace_buffer *buffer,
1373 struct ring_buffer_event *event,
1374 unsigned int trace_ctx)
1375 {
1376 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1377 }
1378
1379 DECLARE_PER_CPU(bool, trace_taskinfo_save);
1380 int trace_save_cmdline(struct task_struct *tsk);
1381 int trace_create_savedcmd(void);
1382 int trace_alloc_tgid_map(void);
1383 void trace_free_saved_cmdlines_buffer(void);
1384
1385 extern const struct file_operations tracing_saved_cmdlines_fops;
1386 extern const struct file_operations tracing_saved_tgids_fops;
1387 extern const struct file_operations tracing_saved_cmdlines_size_fops;
1388
1389 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1390 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1391 void trace_buffered_event_disable(void);
1392 void trace_buffered_event_enable(void);
1393
1394 void early_enable_events(struct trace_array *tr, char *buf, bool disable_first);
1395
1396 static inline void
__trace_event_discard_commit(struct trace_buffer * buffer,struct ring_buffer_event * event)1397 __trace_event_discard_commit(struct trace_buffer *buffer,
1398 struct ring_buffer_event *event)
1399 {
1400 if (this_cpu_read(trace_buffered_event) == event) {
1401 /* Simply release the temp buffer and enable preemption */
1402 this_cpu_dec(trace_buffered_event_cnt);
1403 preempt_enable_notrace();
1404 return;
1405 }
1406 /* ring_buffer_discard_commit() enables preemption */
1407 ring_buffer_discard_commit(buffer, event);
1408 }
1409
1410 /*
1411 * Helper function for event_trigger_unlock_commit{_regs}().
1412 * If there are event triggers attached to this event that requires
1413 * filtering against its fields, then they will be called as the
1414 * entry already holds the field information of the current event.
1415 *
1416 * It also checks if the event should be discarded or not.
1417 * It is to be discarded if the event is soft disabled and the
1418 * event was only recorded to process triggers, or if the event
1419 * filter is active and this event did not match the filters.
1420 *
1421 * Returns true if the event is discarded, false otherwise.
1422 */
1423 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)1424 __event_trigger_test_discard(struct trace_event_file *file,
1425 struct trace_buffer *buffer,
1426 struct ring_buffer_event *event,
1427 void *entry,
1428 enum event_trigger_type *tt)
1429 {
1430 unsigned long eflags = file->flags;
1431
1432 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1433 *tt = event_triggers_call(file, buffer, entry, event);
1434
1435 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED |
1436 EVENT_FILE_FL_FILTERED |
1437 EVENT_FILE_FL_PID_FILTER))))
1438 return false;
1439
1440 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1441 goto discard;
1442
1443 if (file->flags & EVENT_FILE_FL_FILTERED &&
1444 !filter_match_preds(file->filter, entry))
1445 goto discard;
1446
1447 if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1448 trace_event_ignore_this_pid(file))
1449 goto discard;
1450
1451 return false;
1452 discard:
1453 __trace_event_discard_commit(buffer, event);
1454 return true;
1455 }
1456
1457 /**
1458 * event_trigger_unlock_commit - handle triggers and finish event commit
1459 * @file: The file pointer associated with the event
1460 * @buffer: The ring buffer that the event is being written to
1461 * @event: The event meta data in the ring buffer
1462 * @entry: The event itself
1463 * @trace_ctx: The tracing context flags.
1464 *
1465 * This is a helper function to handle triggers that require data
1466 * from the event itself. It also tests the event against filters and
1467 * if the event is soft disabled and should be discarded.
1468 */
1469 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)1470 event_trigger_unlock_commit(struct trace_event_file *file,
1471 struct trace_buffer *buffer,
1472 struct ring_buffer_event *event,
1473 void *entry, unsigned int trace_ctx)
1474 {
1475 enum event_trigger_type tt = ETT_NONE;
1476
1477 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1478 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1479
1480 if (tt)
1481 event_triggers_post_call(file, tt);
1482 }
1483
1484 #define FILTER_PRED_INVALID ((unsigned short)-1)
1485 #define FILTER_PRED_IS_RIGHT (1 << 15)
1486 #define FILTER_PRED_FOLD (1 << 15)
1487
1488 /*
1489 * The max preds is the size of unsigned short with
1490 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1491 * and FOLD flags. The other is reserved.
1492 *
1493 * 2^14 preds is way more than enough.
1494 */
1495 #define MAX_FILTER_PRED 16384
1496
1497 struct filter_pred;
1498 struct regex;
1499
1500 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1501
1502 enum regex_type {
1503 MATCH_FULL = 0,
1504 MATCH_FRONT_ONLY,
1505 MATCH_MIDDLE_ONLY,
1506 MATCH_END_ONLY,
1507 MATCH_GLOB,
1508 MATCH_INDEX,
1509 };
1510
1511 struct regex {
1512 char pattern[MAX_FILTER_STR_VAL];
1513 int len;
1514 int field_len;
1515 regex_match_func match;
1516 };
1517
is_string_field(struct ftrace_event_field * field)1518 static inline bool is_string_field(struct ftrace_event_field *field)
1519 {
1520 return field->filter_type == FILTER_DYN_STRING ||
1521 field->filter_type == FILTER_RDYN_STRING ||
1522 field->filter_type == FILTER_STATIC_STRING ||
1523 field->filter_type == FILTER_PTR_STRING ||
1524 field->filter_type == FILTER_COMM;
1525 }
1526
is_function_field(struct ftrace_event_field * field)1527 static inline bool is_function_field(struct ftrace_event_field *field)
1528 {
1529 return field->filter_type == FILTER_TRACE_FN;
1530 }
1531
1532 extern enum regex_type
1533 filter_parse_regex(char *buff, int len, char **search, int *not);
1534 extern void print_event_filter(struct trace_event_file *file,
1535 struct trace_seq *s);
1536 extern int apply_event_filter(struct trace_event_file *file,
1537 char *filter_string);
1538 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1539 char *filter_string);
1540 extern void print_subsystem_event_filter(struct event_subsystem *system,
1541 struct trace_seq *s);
1542 extern int filter_assign_type(const char *type);
1543 extern int create_event_filter(struct trace_array *tr,
1544 struct trace_event_call *call,
1545 char *filter_str, bool set_str,
1546 struct event_filter **filterp);
1547 extern void free_event_filter(struct event_filter *filter);
1548
1549 struct ftrace_event_field *
1550 trace_find_event_field(struct trace_event_call *call, char *name);
1551
1552 extern void trace_event_enable_cmd_record(bool enable);
1553 extern void trace_event_enable_tgid_record(bool enable);
1554
1555 extern int event_trace_init(void);
1556 extern int init_events(void);
1557 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1558 extern int event_trace_del_tracer(struct trace_array *tr);
1559 extern void __trace_early_add_events(struct trace_array *tr);
1560
1561 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1562 const char *system,
1563 const char *event);
1564 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1565 const char *system,
1566 const char *event);
1567
event_file_data(struct file * filp)1568 static inline void *event_file_data(struct file *filp)
1569 {
1570 return READ_ONCE(file_inode(filp)->i_private);
1571 }
1572
1573 extern struct mutex event_mutex;
1574 extern struct list_head ftrace_events;
1575
1576 extern const struct file_operations event_trigger_fops;
1577 extern const struct file_operations event_hist_fops;
1578 extern const struct file_operations event_hist_debug_fops;
1579 extern const struct file_operations event_inject_fops;
1580
1581 #ifdef CONFIG_HIST_TRIGGERS
1582 extern int register_trigger_hist_cmd(void);
1583 extern int register_trigger_hist_enable_disable_cmds(void);
1584 #else
register_trigger_hist_cmd(void)1585 static inline int register_trigger_hist_cmd(void) { return 0; }
register_trigger_hist_enable_disable_cmds(void)1586 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1587 #endif
1588
1589 extern int register_trigger_cmds(void);
1590 extern void clear_event_triggers(struct trace_array *tr);
1591
1592 enum {
1593 EVENT_TRIGGER_FL_PROBE = BIT(0),
1594 };
1595
1596 struct event_trigger_data {
1597 unsigned long count;
1598 int ref;
1599 int flags;
1600 struct event_trigger_ops *ops;
1601 struct event_command *cmd_ops;
1602 struct event_filter __rcu *filter;
1603 char *filter_str;
1604 void *private_data;
1605 bool paused;
1606 bool paused_tmp;
1607 struct list_head list;
1608 char *name;
1609 struct list_head named_list;
1610 struct event_trigger_data *named_data;
1611 };
1612
1613 /* Avoid typos */
1614 #define ENABLE_EVENT_STR "enable_event"
1615 #define DISABLE_EVENT_STR "disable_event"
1616 #define ENABLE_HIST_STR "enable_hist"
1617 #define DISABLE_HIST_STR "disable_hist"
1618
1619 struct enable_trigger_data {
1620 struct trace_event_file *file;
1621 bool enable;
1622 bool hist;
1623 };
1624
1625 extern int event_enable_trigger_print(struct seq_file *m,
1626 struct event_trigger_data *data);
1627 extern void event_enable_trigger_free(struct event_trigger_data *data);
1628 extern int event_enable_trigger_parse(struct event_command *cmd_ops,
1629 struct trace_event_file *file,
1630 char *glob, char *cmd,
1631 char *param_and_filter);
1632 extern int event_enable_register_trigger(char *glob,
1633 struct event_trigger_data *data,
1634 struct trace_event_file *file);
1635 extern void event_enable_unregister_trigger(char *glob,
1636 struct event_trigger_data *test,
1637 struct trace_event_file *file);
1638 extern void trigger_data_free(struct event_trigger_data *data);
1639 extern int event_trigger_init(struct event_trigger_data *data);
1640 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1641 int trigger_enable);
1642 extern void update_cond_flag(struct trace_event_file *file);
1643 extern int set_trigger_filter(char *filter_str,
1644 struct event_trigger_data *trigger_data,
1645 struct trace_event_file *file);
1646 extern struct event_trigger_data *find_named_trigger(const char *name);
1647 extern bool is_named_trigger(struct event_trigger_data *test);
1648 extern int save_named_trigger(const char *name,
1649 struct event_trigger_data *data);
1650 extern void del_named_trigger(struct event_trigger_data *data);
1651 extern void pause_named_trigger(struct event_trigger_data *data);
1652 extern void unpause_named_trigger(struct event_trigger_data *data);
1653 extern void set_named_trigger_data(struct event_trigger_data *data,
1654 struct event_trigger_data *named_data);
1655 extern struct event_trigger_data *
1656 get_named_trigger_data(struct event_trigger_data *data);
1657 extern int register_event_command(struct event_command *cmd);
1658 extern int unregister_event_command(struct event_command *cmd);
1659 extern int register_trigger_hist_enable_disable_cmds(void);
1660 extern bool event_trigger_check_remove(const char *glob);
1661 extern bool event_trigger_empty_param(const char *param);
1662 extern int event_trigger_separate_filter(char *param_and_filter, char **param,
1663 char **filter, bool param_required);
1664 extern struct event_trigger_data *
1665 event_trigger_alloc(struct event_command *cmd_ops,
1666 char *cmd,
1667 char *param,
1668 void *private_data);
1669 extern int event_trigger_parse_num(char *trigger,
1670 struct event_trigger_data *trigger_data);
1671 extern int event_trigger_set_filter(struct event_command *cmd_ops,
1672 struct trace_event_file *file,
1673 char *param,
1674 struct event_trigger_data *trigger_data);
1675 extern void event_trigger_reset_filter(struct event_command *cmd_ops,
1676 struct event_trigger_data *trigger_data);
1677 extern int event_trigger_register(struct event_command *cmd_ops,
1678 struct trace_event_file *file,
1679 char *glob,
1680 struct event_trigger_data *trigger_data);
1681 extern void event_trigger_unregister(struct event_command *cmd_ops,
1682 struct trace_event_file *file,
1683 char *glob,
1684 struct event_trigger_data *trigger_data);
1685
1686 extern void event_file_get(struct trace_event_file *file);
1687 extern void event_file_put(struct trace_event_file *file);
1688
1689 /**
1690 * struct event_trigger_ops - callbacks for trace event triggers
1691 *
1692 * The methods in this structure provide per-event trigger hooks for
1693 * various trigger operations.
1694 *
1695 * The @init and @free methods are used during trigger setup and
1696 * teardown, typically called from an event_command's @parse()
1697 * function implementation.
1698 *
1699 * The @print method is used to print the trigger spec.
1700 *
1701 * The @trigger method is the function that actually implements the
1702 * trigger and is called in the context of the triggering event
1703 * whenever that event occurs.
1704 *
1705 * All the methods below, except for @init() and @free(), must be
1706 * implemented.
1707 *
1708 * @trigger: The trigger 'probe' function called when the triggering
1709 * event occurs. The data passed into this callback is the data
1710 * that was supplied to the event_command @reg() function that
1711 * registered the trigger (see struct event_command) along with
1712 * the trace record, rec.
1713 *
1714 * @init: An optional initialization function called for the trigger
1715 * when the trigger is registered (via the event_command reg()
1716 * function). This can be used to perform per-trigger
1717 * initialization such as incrementing a per-trigger reference
1718 * count, for instance. This is usually implemented by the
1719 * generic utility function @event_trigger_init() (see
1720 * trace_event_triggers.c).
1721 *
1722 * @free: An optional de-initialization function called for the
1723 * trigger when the trigger is unregistered (via the
1724 * event_command @reg() function). This can be used to perform
1725 * per-trigger de-initialization such as decrementing a
1726 * per-trigger reference count and freeing corresponding trigger
1727 * data, for instance. This is usually implemented by the
1728 * generic utility function @event_trigger_free() (see
1729 * trace_event_triggers.c).
1730 *
1731 * @print: The callback function invoked to have the trigger print
1732 * itself. This is usually implemented by a wrapper function
1733 * that calls the generic utility function @event_trigger_print()
1734 * (see trace_event_triggers.c).
1735 */
1736 struct event_trigger_ops {
1737 void (*trigger)(struct event_trigger_data *data,
1738 struct trace_buffer *buffer,
1739 void *rec,
1740 struct ring_buffer_event *rbe);
1741 int (*init)(struct event_trigger_data *data);
1742 void (*free)(struct event_trigger_data *data);
1743 int (*print)(struct seq_file *m,
1744 struct event_trigger_data *data);
1745 };
1746
1747 /**
1748 * struct event_command - callbacks and data members for event commands
1749 *
1750 * Event commands are invoked by users by writing the command name
1751 * into the 'trigger' file associated with a trace event. The
1752 * parameters associated with a specific invocation of an event
1753 * command are used to create an event trigger instance, which is
1754 * added to the list of trigger instances associated with that trace
1755 * event. When the event is hit, the set of triggers associated with
1756 * that event is invoked.
1757 *
1758 * The data members in this structure provide per-event command data
1759 * for various event commands.
1760 *
1761 * All the data members below, except for @post_trigger, must be set
1762 * for each event command.
1763 *
1764 * @name: The unique name that identifies the event command. This is
1765 * the name used when setting triggers via trigger files.
1766 *
1767 * @trigger_type: A unique id that identifies the event command
1768 * 'type'. This value has two purposes, the first to ensure that
1769 * only one trigger of the same type can be set at a given time
1770 * for a particular event e.g. it doesn't make sense to have both
1771 * a traceon and traceoff trigger attached to a single event at
1772 * the same time, so traceon and traceoff have the same type
1773 * though they have different names. The @trigger_type value is
1774 * also used as a bit value for deferring the actual trigger
1775 * action until after the current event is finished. Some
1776 * commands need to do this if they themselves log to the trace
1777 * buffer (see the @post_trigger() member below). @trigger_type
1778 * values are defined by adding new values to the trigger_type
1779 * enum in include/linux/trace_events.h.
1780 *
1781 * @flags: See the enum event_command_flags below.
1782 *
1783 * All the methods below, except for @set_filter() and @unreg_all(),
1784 * must be implemented.
1785 *
1786 * @parse: The callback function responsible for parsing and
1787 * registering the trigger written to the 'trigger' file by the
1788 * user. It allocates the trigger instance and registers it with
1789 * the appropriate trace event. It makes use of the other
1790 * event_command callback functions to orchestrate this, and is
1791 * usually implemented by the generic utility function
1792 * @event_trigger_callback() (see trace_event_triggers.c).
1793 *
1794 * @reg: Adds the trigger to the list of triggers associated with the
1795 * event, and enables the event trigger itself, after
1796 * initializing it (via the event_trigger_ops @init() function).
1797 * This is also where commands can use the @trigger_type value to
1798 * make the decision as to whether or not multiple instances of
1799 * the trigger should be allowed. This is usually implemented by
1800 * the generic utility function @register_trigger() (see
1801 * trace_event_triggers.c).
1802 *
1803 * @unreg: Removes the trigger from the list of triggers associated
1804 * with the event, and disables the event trigger itself, after
1805 * initializing it (via the event_trigger_ops @free() function).
1806 * This is usually implemented by the generic utility function
1807 * @unregister_trigger() (see trace_event_triggers.c).
1808 *
1809 * @unreg_all: An optional function called to remove all the triggers
1810 * from the list of triggers associated with the event. Called
1811 * when a trigger file is opened in truncate mode.
1812 *
1813 * @set_filter: An optional function called to parse and set a filter
1814 * for the trigger. If no @set_filter() method is set for the
1815 * event command, filters set by the user for the command will be
1816 * ignored. This is usually implemented by the generic utility
1817 * function @set_trigger_filter() (see trace_event_triggers.c).
1818 *
1819 * @get_trigger_ops: The callback function invoked to retrieve the
1820 * event_trigger_ops implementation associated with the command.
1821 * This callback function allows a single event_command to
1822 * support multiple trigger implementations via different sets of
1823 * event_trigger_ops, depending on the value of the @param
1824 * string.
1825 */
1826 struct event_command {
1827 struct list_head list;
1828 char *name;
1829 enum event_trigger_type trigger_type;
1830 int flags;
1831 int (*parse)(struct event_command *cmd_ops,
1832 struct trace_event_file *file,
1833 char *glob, char *cmd,
1834 char *param_and_filter);
1835 int (*reg)(char *glob,
1836 struct event_trigger_data *data,
1837 struct trace_event_file *file);
1838 void (*unreg)(char *glob,
1839 struct event_trigger_data *data,
1840 struct trace_event_file *file);
1841 void (*unreg_all)(struct trace_event_file *file);
1842 int (*set_filter)(char *filter_str,
1843 struct event_trigger_data *data,
1844 struct trace_event_file *file);
1845 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1846 };
1847
1848 /**
1849 * enum event_command_flags - flags for struct event_command
1850 *
1851 * @POST_TRIGGER: A flag that says whether or not this command needs
1852 * to have its action delayed until after the current event has
1853 * been closed. Some triggers need to avoid being invoked while
1854 * an event is currently in the process of being logged, since
1855 * the trigger may itself log data into the trace buffer. Thus
1856 * we make sure the current event is committed before invoking
1857 * those triggers. To do that, the trigger invocation is split
1858 * in two - the first part checks the filter using the current
1859 * trace record; if a command has the @post_trigger flag set, it
1860 * sets a bit for itself in the return value, otherwise it
1861 * directly invokes the trigger. Once all commands have been
1862 * either invoked or set their return flag, the current record is
1863 * either committed or discarded. At that point, if any commands
1864 * have deferred their triggers, those commands are finally
1865 * invoked following the close of the current event. In other
1866 * words, if the event_trigger_ops @func() probe implementation
1867 * itself logs to the trace buffer, this flag should be set,
1868 * otherwise it can be left unspecified.
1869 *
1870 * @NEEDS_REC: A flag that says whether or not this command needs
1871 * access to the trace record in order to perform its function,
1872 * regardless of whether or not it has a filter associated with
1873 * it (filters make a trigger require access to the trace record
1874 * but are not always present).
1875 */
1876 enum event_command_flags {
1877 EVENT_CMD_FL_POST_TRIGGER = 1,
1878 EVENT_CMD_FL_NEEDS_REC = 2,
1879 };
1880
event_command_post_trigger(struct event_command * cmd_ops)1881 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1882 {
1883 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1884 }
1885
event_command_needs_rec(struct event_command * cmd_ops)1886 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1887 {
1888 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1889 }
1890
1891 extern int trace_event_enable_disable(struct trace_event_file *file,
1892 int enable, int soft_disable);
1893 extern int tracing_alloc_snapshot(void);
1894 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1895 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1896
1897 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1898 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1899
1900 extern const char *__start___trace_bprintk_fmt[];
1901 extern const char *__stop___trace_bprintk_fmt[];
1902
1903 extern const char *__start___tracepoint_str[];
1904 extern const char *__stop___tracepoint_str[];
1905
1906 void trace_printk_control(bool enabled);
1907 void trace_printk_start_comm(void);
1908 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1909 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1910
1911 /* Used from boot time tracer */
1912 extern int trace_set_options(struct trace_array *tr, char *option);
1913 extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1914 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1915 unsigned long size, int cpu_id);
1916 extern int tracing_set_cpumask(struct trace_array *tr,
1917 cpumask_var_t tracing_cpumask_new);
1918
1919
1920 #define MAX_EVENT_NAME_LEN 64
1921
1922 extern ssize_t trace_parse_run_command(struct file *file,
1923 const char __user *buffer, size_t count, loff_t *ppos,
1924 int (*createfn)(const char *));
1925
1926 extern unsigned int err_pos(char *cmd, const char *str);
1927 extern void tracing_log_err(struct trace_array *tr,
1928 const char *loc, const char *cmd,
1929 const char **errs, u8 type, u16 pos);
1930
1931 /*
1932 * Normal trace_printk() and friends allocates special buffers
1933 * to do the manipulation, as well as saves the print formats
1934 * into sections to display. But the trace infrastructure wants
1935 * to use these without the added overhead at the price of being
1936 * a bit slower (used mainly for warnings, where we don't care
1937 * about performance). The internal_trace_puts() is for such
1938 * a purpose.
1939 */
1940 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1941
1942 #undef FTRACE_ENTRY
1943 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1944 extern struct trace_event_call \
1945 __aligned(4) event_##call;
1946 #undef FTRACE_ENTRY_DUP
1947 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1948 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1949 #undef FTRACE_ENTRY_PACKED
1950 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1951 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1952
1953 #include "trace_entries.h"
1954
1955 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1956 int perf_ftrace_event_register(struct trace_event_call *call,
1957 enum trace_reg type, void *data);
1958 #else
1959 #define perf_ftrace_event_register NULL
1960 #endif
1961
1962 #ifdef CONFIG_FTRACE_SYSCALLS
1963 void init_ftrace_syscalls(void);
1964 const char *get_syscall_name(int syscall);
1965 #else
init_ftrace_syscalls(void)1966 static inline void init_ftrace_syscalls(void) { }
get_syscall_name(int syscall)1967 static inline const char *get_syscall_name(int syscall)
1968 {
1969 return NULL;
1970 }
1971 #endif
1972
1973 #ifdef CONFIG_EVENT_TRACING
1974 void trace_event_init(void);
1975 void trace_event_eval_update(struct trace_eval_map **map, int len);
1976 /* Used from boot time tracer */
1977 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1978 extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1979 #else
trace_event_init(void)1980 static inline void __init trace_event_init(void) { }
trace_event_eval_update(struct trace_eval_map ** map,int len)1981 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1982 #endif
1983
1984 #ifdef CONFIG_TRACER_SNAPSHOT
1985 void tracing_snapshot_instance(struct trace_array *tr);
1986 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1987 int tracing_arm_snapshot(struct trace_array *tr);
1988 void tracing_disarm_snapshot(struct trace_array *tr);
1989 #else
tracing_snapshot_instance(struct trace_array * tr)1990 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
tracing_alloc_snapshot_instance(struct trace_array * tr)1991 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1992 {
1993 return 0;
1994 }
tracing_arm_snapshot(struct trace_array * tr)1995 static inline int tracing_arm_snapshot(struct trace_array *tr) { return 0; }
tracing_disarm_snapshot(struct trace_array * tr)1996 static inline void tracing_disarm_snapshot(struct trace_array *tr) { }
1997 #endif
1998
1999 #ifdef CONFIG_PREEMPT_TRACER
2000 void tracer_preempt_on(unsigned long a0, unsigned long a1);
2001 void tracer_preempt_off(unsigned long a0, unsigned long a1);
2002 #else
tracer_preempt_on(unsigned long a0,unsigned long a1)2003 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
tracer_preempt_off(unsigned long a0,unsigned long a1)2004 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
2005 #endif
2006 #ifdef CONFIG_IRQSOFF_TRACER
2007 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
2008 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
2009 #else
tracer_hardirqs_on(unsigned long a0,unsigned long a1)2010 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
tracer_hardirqs_off(unsigned long a0,unsigned long a1)2011 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
2012 #endif
2013
2014 /*
2015 * Reset the state of the trace_iterator so that it can read consumed data.
2016 * Normally, the trace_iterator is used for reading the data when it is not
2017 * consumed, and must retain state.
2018 */
trace_iterator_reset(struct trace_iterator * iter)2019 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
2020 {
2021 memset_startat(iter, 0, seq);
2022 iter->pos = -1;
2023 }
2024
2025 /* Check the name is good for event/group/fields */
__is_good_name(const char * name,bool hash_ok)2026 static inline bool __is_good_name(const char *name, bool hash_ok)
2027 {
2028 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-'))
2029 return false;
2030 while (*++name != '\0') {
2031 if (!isalpha(*name) && !isdigit(*name) && *name != '_' &&
2032 (!hash_ok || *name != '-'))
2033 return false;
2034 }
2035 return true;
2036 }
2037
2038 /* Check the name is good for event/group/fields */
is_good_name(const char * name)2039 static inline bool is_good_name(const char *name)
2040 {
2041 return __is_good_name(name, false);
2042 }
2043
2044 /* Check the name is good for system */
is_good_system_name(const char * name)2045 static inline bool is_good_system_name(const char *name)
2046 {
2047 return __is_good_name(name, true);
2048 }
2049
2050 /* Convert certain expected symbols into '_' when generating event names */
sanitize_event_name(char * name)2051 static inline void sanitize_event_name(char *name)
2052 {
2053 while (*name++ != '\0')
2054 if (*name == ':' || *name == '.')
2055 *name = '_';
2056 }
2057
2058 /*
2059 * This is a generic way to read and write a u64 value from a file in tracefs.
2060 *
2061 * The value is stored on the variable pointed by *val. The value needs
2062 * to be at least *min and at most *max. The write is protected by an
2063 * existing *lock.
2064 */
2065 struct trace_min_max_param {
2066 struct mutex *lock;
2067 u64 *val;
2068 u64 *min;
2069 u64 *max;
2070 };
2071
2072 #define U64_STR_SIZE 24 /* 20 digits max */
2073
2074 extern const struct file_operations trace_min_max_fops;
2075
2076 #ifdef CONFIG_RV
2077 extern int rv_init_interface(void);
2078 #else
rv_init_interface(void)2079 static inline int rv_init_interface(void)
2080 {
2081 return 0;
2082 }
2083 #endif
2084
2085 #endif /* _LINUX_KERNEL_TRACE_H */
2086