1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef _LINUX_TRACE_EVENT_H
4 #define _LINUX_TRACE_EVENT_H
5
6 #include <linux/ring_buffer.h>
7 #include <linux/trace_seq.h>
8 #include <linux/percpu.h>
9 #include <linux/hardirq.h>
10 #include <linux/perf_event.h>
11 #include <linux/tracepoint.h>
12
13 struct trace_array;
14 struct array_buffer;
15 struct tracer;
16 struct dentry;
17 struct bpf_prog;
18 union bpf_attr;
19
20 /* Used for event string fields when they are NULL */
21 #define EVENT_NULL_STR "(null)"
22
23 const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
24 unsigned long flags,
25 const struct trace_print_flags *flag_array);
26
27 const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
28 const struct trace_print_flags *symbol_array);
29
30 #if BITS_PER_LONG == 32
31 const char *trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
32 unsigned long long flags,
33 const struct trace_print_flags_u64 *flag_array);
34
35 const char *trace_print_symbols_seq_u64(struct trace_seq *p,
36 unsigned long long val,
37 const struct trace_print_flags_u64
38 *symbol_array);
39 #endif
40
41 const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
42 unsigned int bitmask_size);
43
44 const char *trace_print_hex_seq(struct trace_seq *p,
45 const unsigned char *buf, int len,
46 bool concatenate);
47
48 const char *trace_print_array_seq(struct trace_seq *p,
49 const void *buf, int count,
50 size_t el_size);
51
52 const char *
53 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
54 int prefix_type, int rowsize, int groupsize,
55 const void *buf, size_t len, bool ascii);
56
57 struct trace_iterator;
58 struct trace_event;
59
60 int trace_raw_output_prep(struct trace_iterator *iter,
61 struct trace_event *event);
62 extern __printf(2, 3)
63 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...);
64
65 /* Used to find the offset and length of dynamic fields in trace events */
66 struct trace_dynamic_info {
67 #ifdef CONFIG_CPU_BIG_ENDIAN
68 u16 len;
69 u16 offset;
70 #else
71 u16 offset;
72 u16 len;
73 #endif
74 } __packed;
75
76 /*
77 * The trace entry - the most basic unit of tracing. This is what
78 * is printed in the end as a single line in the trace output, such as:
79 *
80 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
81 */
82 struct trace_entry {
83 unsigned short type;
84 unsigned char flags;
85 unsigned char preempt_count;
86 int pid;
87 };
88
89 #define TRACE_EVENT_TYPE_MAX \
90 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
91
92 /*
93 * Trace iterator - used by printout routines who present trace
94 * results to users and which routines might sleep, etc:
95 */
96 struct trace_iterator {
97 struct trace_array *tr;
98 struct tracer *trace;
99 struct array_buffer *array_buffer;
100 void *private;
101 int cpu_file;
102 struct mutex mutex;
103 struct ring_buffer_iter **buffer_iter;
104 unsigned long iter_flags;
105 void *temp; /* temp holder */
106 unsigned int temp_size;
107 char *fmt; /* modified format holder */
108 unsigned int fmt_size;
109 atomic_t wait_index;
110
111 /* trace_seq for __print_flags() and __print_symbolic() etc. */
112 struct trace_seq tmp_seq;
113
114 cpumask_var_t started;
115
116 /* Set when the file is closed to prevent new waiters */
117 bool closed;
118
119 /* it's true when current open file is snapshot */
120 bool snapshot;
121
122 /* The below is zeroed out in pipe_read */
123 struct trace_seq seq;
124 struct trace_entry *ent;
125 unsigned long lost_events;
126 int leftover;
127 int ent_size;
128 int cpu;
129 u64 ts;
130
131 loff_t pos;
132 long idx;
133
134 /* All new field here will be zeroed out in pipe_read */
135 };
136
137 enum trace_iter_flags {
138 TRACE_FILE_LAT_FMT = 1,
139 TRACE_FILE_ANNOTATE = 2,
140 TRACE_FILE_TIME_IN_NS = 4,
141 };
142
143
144 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
145 int flags, struct trace_event *event);
146
147 struct trace_event_functions {
148 trace_print_func trace;
149 trace_print_func raw;
150 trace_print_func hex;
151 trace_print_func binary;
152 };
153
154 struct trace_event {
155 struct hlist_node node;
156 int type;
157 struct trace_event_functions *funcs;
158 };
159
160 extern int register_trace_event(struct trace_event *event);
161 extern int unregister_trace_event(struct trace_event *event);
162
163 /* Return values for print_line callback */
164 enum print_line_t {
165 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
166 TRACE_TYPE_HANDLED = 1,
167 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
168 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
169 };
170
171 enum print_line_t trace_handle_return(struct trace_seq *s);
172
tracing_generic_entry_update(struct trace_entry * entry,unsigned short type,unsigned int trace_ctx)173 static inline void tracing_generic_entry_update(struct trace_entry *entry,
174 unsigned short type,
175 unsigned int trace_ctx)
176 {
177 entry->preempt_count = trace_ctx & 0xff;
178 entry->pid = current->pid;
179 entry->type = type;
180 entry->flags = trace_ctx >> 16;
181 }
182
183 unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status);
184
185 enum trace_flag_type {
186 TRACE_FLAG_IRQS_OFF = 0x01,
187 TRACE_FLAG_NEED_RESCHED_LAZY = 0x02,
188 TRACE_FLAG_NEED_RESCHED = 0x04,
189 TRACE_FLAG_HARDIRQ = 0x08,
190 TRACE_FLAG_SOFTIRQ = 0x10,
191 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
192 TRACE_FLAG_NMI = 0x40,
193 TRACE_FLAG_BH_OFF = 0x80,
194 };
195
tracing_gen_ctx_flags(unsigned long irqflags)196 static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
197 {
198 unsigned int irq_status = irqs_disabled_flags(irqflags) ?
199 TRACE_FLAG_IRQS_OFF : 0;
200 return tracing_gen_ctx_irq_test(irq_status);
201 }
tracing_gen_ctx(void)202 static inline unsigned int tracing_gen_ctx(void)
203 {
204 unsigned long irqflags;
205
206 local_save_flags(irqflags);
207 return tracing_gen_ctx_flags(irqflags);
208 }
209
tracing_gen_ctx_dec(void)210 static inline unsigned int tracing_gen_ctx_dec(void)
211 {
212 unsigned int trace_ctx;
213
214 trace_ctx = tracing_gen_ctx();
215 /*
216 * Subtract one from the preemption counter if preemption is enabled,
217 * see trace_event_buffer_reserve()for details.
218 */
219 if (IS_ENABLED(CONFIG_PREEMPTION))
220 trace_ctx--;
221 return trace_ctx;
222 }
223
224 struct trace_event_file;
225
226 struct ring_buffer_event *
227 trace_event_buffer_lock_reserve(struct trace_buffer **current_buffer,
228 struct trace_event_file *trace_file,
229 int type, unsigned long len,
230 unsigned int trace_ctx);
231
232 #define TRACE_RECORD_CMDLINE BIT(0)
233 #define TRACE_RECORD_TGID BIT(1)
234
235 void tracing_record_taskinfo(struct task_struct *task, int flags);
236 void tracing_record_taskinfo_sched_switch(struct task_struct *prev,
237 struct task_struct *next, int flags);
238
239 void tracing_record_cmdline(struct task_struct *task);
240 void tracing_record_tgid(struct task_struct *task);
241
242 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
243 __printf(3, 4);
244
245 struct event_filter;
246
247 enum trace_reg {
248 TRACE_REG_REGISTER,
249 TRACE_REG_UNREGISTER,
250 #ifdef CONFIG_PERF_EVENTS
251 TRACE_REG_PERF_REGISTER,
252 TRACE_REG_PERF_UNREGISTER,
253 TRACE_REG_PERF_OPEN,
254 TRACE_REG_PERF_CLOSE,
255 /*
256 * These (ADD/DEL) use a 'boolean' return value, where 1 (true) means a
257 * custom action was taken and the default action is not to be
258 * performed.
259 */
260 TRACE_REG_PERF_ADD,
261 TRACE_REG_PERF_DEL,
262 #endif
263 };
264
265 struct trace_event_call;
266
267 #define TRACE_FUNCTION_TYPE ((const char *)~0UL)
268
269 struct trace_event_fields {
270 const char *type;
271 union {
272 struct {
273 const char *name;
274 const int size;
275 const int align;
276 const unsigned int is_signed:1;
277 unsigned int needs_test:1;
278 const int filter_type;
279 const int len;
280 };
281 int (*define_fields)(struct trace_event_call *);
282 };
283 };
284
285 struct trace_event_class {
286 const char *system;
287 void *probe;
288 #ifdef CONFIG_PERF_EVENTS
289 void *perf_probe;
290 #endif
291 int (*reg)(struct trace_event_call *event,
292 enum trace_reg type, void *data);
293 struct trace_event_fields *fields_array;
294 struct list_head *(*get_fields)(struct trace_event_call *);
295 struct list_head fields;
296 int (*raw_init)(struct trace_event_call *);
297 };
298
299 extern int trace_event_reg(struct trace_event_call *event,
300 enum trace_reg type, void *data);
301
302 struct trace_event_buffer {
303 struct trace_buffer *buffer;
304 struct ring_buffer_event *event;
305 struct trace_event_file *trace_file;
306 void *entry;
307 unsigned int trace_ctx;
308 struct pt_regs *regs;
309 };
310
311 void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
312 struct trace_event_file *trace_file,
313 unsigned long len);
314
315 void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
316
317 enum {
318 TRACE_EVENT_FL_CAP_ANY_BIT,
319 TRACE_EVENT_FL_NO_SET_FILTER_BIT,
320 TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
321 TRACE_EVENT_FL_TRACEPOINT_BIT,
322 TRACE_EVENT_FL_DYNAMIC_BIT,
323 TRACE_EVENT_FL_KPROBE_BIT,
324 TRACE_EVENT_FL_UPROBE_BIT,
325 TRACE_EVENT_FL_EPROBE_BIT,
326 TRACE_EVENT_FL_FPROBE_BIT,
327 TRACE_EVENT_FL_CUSTOM_BIT,
328 TRACE_EVENT_FL_TEST_STR_BIT,
329 };
330
331 /*
332 * Event flags:
333 * CAP_ANY - Any user can enable for perf
334 * NO_SET_FILTER - Set when filter has error and is to be ignored
335 * IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
336 * TRACEPOINT - Event is a tracepoint
337 * DYNAMIC - Event is a dynamic event (created at run time)
338 * KPROBE - Event is a kprobe
339 * UPROBE - Event is a uprobe
340 * EPROBE - Event is an event probe
341 * FPROBE - Event is an function probe
342 * CUSTOM - Event is a custom event (to be attached to an exsiting tracepoint)
343 * This is set when the custom event has not been attached
344 * to a tracepoint yet, then it is cleared when it is.
345 * TEST_STR - The event has a "%s" that points to a string outside the event
346 */
347 enum {
348 TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
349 TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
350 TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
351 TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
352 TRACE_EVENT_FL_DYNAMIC = (1 << TRACE_EVENT_FL_DYNAMIC_BIT),
353 TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_BIT),
354 TRACE_EVENT_FL_UPROBE = (1 << TRACE_EVENT_FL_UPROBE_BIT),
355 TRACE_EVENT_FL_EPROBE = (1 << TRACE_EVENT_FL_EPROBE_BIT),
356 TRACE_EVENT_FL_FPROBE = (1 << TRACE_EVENT_FL_FPROBE_BIT),
357 TRACE_EVENT_FL_CUSTOM = (1 << TRACE_EVENT_FL_CUSTOM_BIT),
358 TRACE_EVENT_FL_TEST_STR = (1 << TRACE_EVENT_FL_TEST_STR_BIT),
359 };
360
361 #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
362
363 struct trace_event_call {
364 struct list_head list;
365 struct trace_event_class *class;
366 union {
367 char *name;
368 /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
369 struct tracepoint *tp;
370 };
371 struct trace_event event;
372 char *print_fmt;
373 /*
374 * Static events can disappear with modules,
375 * where as dynamic ones need their own ref count.
376 */
377 union {
378 void *module;
379 atomic_t refcnt;
380 };
381 void *data;
382
383 /* See the TRACE_EVENT_FL_* flags above */
384 int flags; /* static flags of different events */
385
386 #ifdef CONFIG_PERF_EVENTS
387 int perf_refcount;
388 struct hlist_head __percpu *perf_events;
389 struct bpf_prog_array __rcu *prog_array;
390
391 int (*perf_perm)(struct trace_event_call *,
392 struct perf_event *);
393 #endif
394 };
395
396 #ifdef CONFIG_DYNAMIC_EVENTS
397 bool trace_event_dyn_try_get_ref(struct trace_event_call *call);
398 void trace_event_dyn_put_ref(struct trace_event_call *call);
399 bool trace_event_dyn_busy(struct trace_event_call *call);
400 #else
trace_event_dyn_try_get_ref(struct trace_event_call * call)401 static inline bool trace_event_dyn_try_get_ref(struct trace_event_call *call)
402 {
403 /* Without DYNAMIC_EVENTS configured, nothing should be calling this */
404 return false;
405 }
trace_event_dyn_put_ref(struct trace_event_call * call)406 static inline void trace_event_dyn_put_ref(struct trace_event_call *call)
407 {
408 }
trace_event_dyn_busy(struct trace_event_call * call)409 static inline bool trace_event_dyn_busy(struct trace_event_call *call)
410 {
411 /* Nothing should call this without DYNAIMIC_EVENTS configured. */
412 return true;
413 }
414 #endif
415
trace_event_try_get_ref(struct trace_event_call * call)416 static inline bool trace_event_try_get_ref(struct trace_event_call *call)
417 {
418 if (call->flags & TRACE_EVENT_FL_DYNAMIC)
419 return trace_event_dyn_try_get_ref(call);
420 else
421 return try_module_get(call->module);
422 }
423
trace_event_put_ref(struct trace_event_call * call)424 static inline void trace_event_put_ref(struct trace_event_call *call)
425 {
426 if (call->flags & TRACE_EVENT_FL_DYNAMIC)
427 trace_event_dyn_put_ref(call);
428 else
429 module_put(call->module);
430 }
431
432 #ifdef CONFIG_PERF_EVENTS
bpf_prog_array_valid(struct trace_event_call * call)433 static inline bool bpf_prog_array_valid(struct trace_event_call *call)
434 {
435 /*
436 * This inline function checks whether call->prog_array
437 * is valid or not. The function is called in various places,
438 * outside rcu_read_lock/unlock, as a heuristic to speed up execution.
439 *
440 * If this function returns true, and later call->prog_array
441 * becomes false inside rcu_read_lock/unlock region,
442 * we bail out then. If this function return false,
443 * there is a risk that we might miss a few events if the checking
444 * were delayed until inside rcu_read_lock/unlock region and
445 * call->prog_array happened to become non-NULL then.
446 *
447 * Here, READ_ONCE() is used instead of rcu_access_pointer().
448 * rcu_access_pointer() requires the actual definition of
449 * "struct bpf_prog_array" while READ_ONCE() only needs
450 * a declaration of the same type.
451 */
452 return !!READ_ONCE(call->prog_array);
453 }
454 #endif
455
456 static inline const char *
trace_event_name(struct trace_event_call * call)457 trace_event_name(struct trace_event_call *call)
458 {
459 if (call->flags & TRACE_EVENT_FL_CUSTOM)
460 return call->name;
461 else if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
462 return call->tp ? call->tp->name : NULL;
463 else
464 return call->name;
465 }
466
467 static inline struct list_head *
trace_get_fields(struct trace_event_call * event_call)468 trace_get_fields(struct trace_event_call *event_call)
469 {
470 if (!event_call->class->get_fields)
471 return &event_call->class->fields;
472 return event_call->class->get_fields(event_call);
473 }
474
475 struct trace_subsystem_dir;
476
477 enum {
478 EVENT_FILE_FL_ENABLED_BIT,
479 EVENT_FILE_FL_RECORDED_CMD_BIT,
480 EVENT_FILE_FL_RECORDED_TGID_BIT,
481 EVENT_FILE_FL_FILTERED_BIT,
482 EVENT_FILE_FL_NO_SET_FILTER_BIT,
483 EVENT_FILE_FL_SOFT_MODE_BIT,
484 EVENT_FILE_FL_SOFT_DISABLED_BIT,
485 EVENT_FILE_FL_TRIGGER_MODE_BIT,
486 EVENT_FILE_FL_TRIGGER_COND_BIT,
487 EVENT_FILE_FL_PID_FILTER_BIT,
488 EVENT_FILE_FL_WAS_ENABLED_BIT,
489 EVENT_FILE_FL_FREED_BIT,
490 };
491
492 extern struct trace_event_file *trace_get_event_file(const char *instance,
493 const char *system,
494 const char *event);
495 extern void trace_put_event_file(struct trace_event_file *file);
496
497 #define MAX_DYNEVENT_CMD_LEN (2048)
498
499 enum dynevent_type {
500 DYNEVENT_TYPE_SYNTH = 1,
501 DYNEVENT_TYPE_KPROBE,
502 DYNEVENT_TYPE_NONE,
503 };
504
505 struct dynevent_cmd;
506
507 typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd);
508
509 struct dynevent_cmd {
510 struct seq_buf seq;
511 const char *event_name;
512 unsigned int n_fields;
513 enum dynevent_type type;
514 dynevent_create_fn_t run_command;
515 void *private_data;
516 };
517
518 extern int dynevent_create(struct dynevent_cmd *cmd);
519
520 extern int synth_event_delete(const char *name);
521
522 extern void synth_event_cmd_init(struct dynevent_cmd *cmd,
523 char *buf, int maxlen);
524
525 extern int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd,
526 const char *name,
527 struct module *mod, ...);
528
529 #define synth_event_gen_cmd_start(cmd, name, mod, ...) \
530 __synth_event_gen_cmd_start(cmd, name, mod, ## __VA_ARGS__, NULL)
531
532 struct synth_field_desc {
533 const char *type;
534 const char *name;
535 };
536
537 extern int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd,
538 const char *name,
539 struct module *mod,
540 struct synth_field_desc *fields,
541 unsigned int n_fields);
542 extern int synth_event_create(const char *name,
543 struct synth_field_desc *fields,
544 unsigned int n_fields, struct module *mod);
545
546 extern int synth_event_add_field(struct dynevent_cmd *cmd,
547 const char *type,
548 const char *name);
549 extern int synth_event_add_field_str(struct dynevent_cmd *cmd,
550 const char *type_name);
551 extern int synth_event_add_fields(struct dynevent_cmd *cmd,
552 struct synth_field_desc *fields,
553 unsigned int n_fields);
554
555 #define synth_event_gen_cmd_end(cmd) \
556 dynevent_create(cmd)
557
558 struct synth_event;
559
560 struct synth_event_trace_state {
561 struct trace_event_buffer fbuffer;
562 struct synth_trace_event *entry;
563 struct trace_buffer *buffer;
564 struct synth_event *event;
565 unsigned int cur_field;
566 unsigned int n_u64;
567 bool disabled;
568 bool add_next;
569 bool add_name;
570 };
571
572 extern int synth_event_trace(struct trace_event_file *file,
573 unsigned int n_vals, ...);
574 extern int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
575 unsigned int n_vals);
576 extern int synth_event_trace_start(struct trace_event_file *file,
577 struct synth_event_trace_state *trace_state);
578 extern int synth_event_add_next_val(u64 val,
579 struct synth_event_trace_state *trace_state);
580 extern int synth_event_add_val(const char *field_name, u64 val,
581 struct synth_event_trace_state *trace_state);
582 extern int synth_event_trace_end(struct synth_event_trace_state *trace_state);
583
584 extern int kprobe_event_delete(const char *name);
585
586 extern void kprobe_event_cmd_init(struct dynevent_cmd *cmd,
587 char *buf, int maxlen);
588
589 #define kprobe_event_gen_cmd_start(cmd, name, loc, ...) \
590 __kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)
591
592 #define kretprobe_event_gen_cmd_start(cmd, name, loc, ...) \
593 __kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)
594
595 extern int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd,
596 bool kretprobe,
597 const char *name,
598 const char *loc, ...);
599
600 #define kprobe_event_add_fields(cmd, ...) \
601 __kprobe_event_add_fields(cmd, ## __VA_ARGS__, NULL)
602
603 #define kprobe_event_add_field(cmd, field) \
604 __kprobe_event_add_fields(cmd, field, NULL)
605
606 extern int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...);
607
608 #define kprobe_event_gen_cmd_end(cmd) \
609 dynevent_create(cmd)
610
611 #define kretprobe_event_gen_cmd_end(cmd) \
612 dynevent_create(cmd)
613
614 /*
615 * Event file flags:
616 * ENABLED - The event is enabled
617 * RECORDED_CMD - The comms should be recorded at sched_switch
618 * RECORDED_TGID - The tgids should be recorded at sched_switch
619 * FILTERED - The event has a filter attached
620 * NO_SET_FILTER - Set when filter has error and is to be ignored
621 * SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
622 * SOFT_DISABLED - When set, do not trace the event (even though its
623 * tracepoint may be enabled)
624 * TRIGGER_MODE - When set, invoke the triggers associated with the event
625 * TRIGGER_COND - When set, one or more triggers has an associated filter
626 * PID_FILTER - When set, the event is filtered based on pid
627 * WAS_ENABLED - Set when enabled to know to clear trace on module removal
628 * FREED - File descriptor is freed, all fields should be considered invalid
629 */
630 enum {
631 EVENT_FILE_FL_ENABLED = (1 << EVENT_FILE_FL_ENABLED_BIT),
632 EVENT_FILE_FL_RECORDED_CMD = (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
633 EVENT_FILE_FL_RECORDED_TGID = (1 << EVENT_FILE_FL_RECORDED_TGID_BIT),
634 EVENT_FILE_FL_FILTERED = (1 << EVENT_FILE_FL_FILTERED_BIT),
635 EVENT_FILE_FL_NO_SET_FILTER = (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
636 EVENT_FILE_FL_SOFT_MODE = (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
637 EVENT_FILE_FL_SOFT_DISABLED = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
638 EVENT_FILE_FL_TRIGGER_MODE = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
639 EVENT_FILE_FL_TRIGGER_COND = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
640 EVENT_FILE_FL_PID_FILTER = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
641 EVENT_FILE_FL_WAS_ENABLED = (1 << EVENT_FILE_FL_WAS_ENABLED_BIT),
642 EVENT_FILE_FL_FREED = (1 << EVENT_FILE_FL_FREED_BIT),
643 };
644
645 struct trace_event_file {
646 struct list_head list;
647 struct trace_event_call *event_call;
648 struct event_filter __rcu *filter;
649 struct eventfs_inode *ei;
650 struct trace_array *tr;
651 struct trace_subsystem_dir *system;
652 struct list_head triggers;
653
654 /*
655 * 32 bit flags:
656 * bit 0: enabled
657 * bit 1: enabled cmd record
658 * bit 2: enable/disable with the soft disable bit
659 * bit 3: soft disabled
660 * bit 4: trigger enabled
661 *
662 * Note: The bits must be set atomically to prevent races
663 * from other writers. Reads of flags do not need to be in
664 * sync as they occur in critical sections. But the way flags
665 * is currently used, these changes do not affect the code
666 * except that when a change is made, it may have a slight
667 * delay in propagating the changes to other CPUs due to
668 * caching and such. Which is mostly OK ;-)
669 */
670 unsigned long flags;
671 refcount_t ref; /* ref count for opened files */
672 atomic_t sm_ref; /* soft-mode reference counter */
673 atomic_t tm_ref; /* trigger-mode reference counter */
674 };
675
676 #define __TRACE_EVENT_FLAGS(name, value) \
677 static int __init trace_init_flags_##name(void) \
678 { \
679 event_##name.flags |= value; \
680 return 0; \
681 } \
682 early_initcall(trace_init_flags_##name);
683
684 #define __TRACE_EVENT_PERF_PERM(name, expr...) \
685 static int perf_perm_##name(struct trace_event_call *tp_event, \
686 struct perf_event *p_event) \
687 { \
688 return ({ expr; }); \
689 } \
690 static int __init trace_init_perf_perm_##name(void) \
691 { \
692 event_##name.perf_perm = &perf_perm_##name; \
693 return 0; \
694 } \
695 early_initcall(trace_init_perf_perm_##name);
696
697 #define PERF_MAX_TRACE_SIZE 8192
698
699 #define MAX_FILTER_STR_VAL 256U /* Should handle KSYM_SYMBOL_LEN */
700
701 enum event_trigger_type {
702 ETT_NONE = (0),
703 ETT_TRACE_ONOFF = (1 << 0),
704 ETT_SNAPSHOT = (1 << 1),
705 ETT_STACKTRACE = (1 << 2),
706 ETT_EVENT_ENABLE = (1 << 3),
707 ETT_EVENT_HIST = (1 << 4),
708 ETT_HIST_ENABLE = (1 << 5),
709 ETT_EVENT_EPROBE = (1 << 6),
710 };
711
712 extern int filter_match_preds(struct event_filter *filter, void *rec);
713
714 extern enum event_trigger_type
715 event_triggers_call(struct trace_event_file *file,
716 struct trace_buffer *buffer, void *rec,
717 struct ring_buffer_event *event);
718 extern void
719 event_triggers_post_call(struct trace_event_file *file,
720 enum event_trigger_type tt);
721
722 bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
723
724 bool __trace_trigger_soft_disabled(struct trace_event_file *file);
725
726 /**
727 * trace_trigger_soft_disabled - do triggers and test if soft disabled
728 * @file: The file pointer of the event to test
729 *
730 * If any triggers without filters are attached to this event, they
731 * will be called here. If the event is soft disabled and has no
732 * triggers that require testing the fields, it will return true,
733 * otherwise false.
734 */
735 static __always_inline bool
trace_trigger_soft_disabled(struct trace_event_file * file)736 trace_trigger_soft_disabled(struct trace_event_file *file)
737 {
738 unsigned long eflags = file->flags;
739
740 if (likely(!(eflags & (EVENT_FILE_FL_TRIGGER_MODE |
741 EVENT_FILE_FL_SOFT_DISABLED |
742 EVENT_FILE_FL_PID_FILTER))))
743 return false;
744
745 if (likely(eflags & EVENT_FILE_FL_TRIGGER_COND))
746 return false;
747
748 return __trace_trigger_soft_disabled(file);
749 }
750
751 #ifdef CONFIG_BPF_EVENTS
752 unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);
753 int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);
754 void perf_event_detach_bpf_prog(struct perf_event *event);
755 int perf_event_query_prog_array(struct perf_event *event, void __user *info);
756
757 struct bpf_raw_tp_link;
758 int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link);
759 int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link);
760
761 struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name);
762 void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp);
763 int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
764 u32 *fd_type, const char **buf,
765 u64 *probe_offset, u64 *probe_addr,
766 unsigned long *missed);
767 int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
768 int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
769 #else
trace_call_bpf(struct trace_event_call * call,void * ctx)770 static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
771 {
772 return 1;
773 }
774
775 static inline int
perf_event_attach_bpf_prog(struct perf_event * event,struct bpf_prog * prog,u64 bpf_cookie)776 perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie)
777 {
778 return -EOPNOTSUPP;
779 }
780
perf_event_detach_bpf_prog(struct perf_event * event)781 static inline void perf_event_detach_bpf_prog(struct perf_event *event) { }
782
783 static inline int
perf_event_query_prog_array(struct perf_event * event,void __user * info)784 perf_event_query_prog_array(struct perf_event *event, void __user *info)
785 {
786 return -EOPNOTSUPP;
787 }
788 struct bpf_raw_tp_link;
bpf_probe_register(struct bpf_raw_event_map * btp,struct bpf_raw_tp_link * link)789 static inline int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link)
790 {
791 return -EOPNOTSUPP;
792 }
bpf_probe_unregister(struct bpf_raw_event_map * btp,struct bpf_raw_tp_link * link)793 static inline int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link)
794 {
795 return -EOPNOTSUPP;
796 }
bpf_get_raw_tracepoint(const char * name)797 static inline struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)
798 {
799 return NULL;
800 }
bpf_put_raw_tracepoint(struct bpf_raw_event_map * btp)801 static inline void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
802 {
803 }
bpf_get_perf_event_info(const struct perf_event * event,u32 * prog_id,u32 * fd_type,const char ** buf,u64 * probe_offset,u64 * probe_addr,unsigned long * missed)804 static inline int bpf_get_perf_event_info(const struct perf_event *event,
805 u32 *prog_id, u32 *fd_type,
806 const char **buf, u64 *probe_offset,
807 u64 *probe_addr, unsigned long *missed)
808 {
809 return -EOPNOTSUPP;
810 }
811 static inline int
bpf_kprobe_multi_link_attach(const union bpf_attr * attr,struct bpf_prog * prog)812 bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
813 {
814 return -EOPNOTSUPP;
815 }
816 static inline int
bpf_uprobe_multi_link_attach(const union bpf_attr * attr,struct bpf_prog * prog)817 bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
818 {
819 return -EOPNOTSUPP;
820 }
821 #endif
822
823 enum {
824 FILTER_OTHER = 0,
825 FILTER_STATIC_STRING,
826 FILTER_DYN_STRING,
827 FILTER_RDYN_STRING,
828 FILTER_PTR_STRING,
829 FILTER_TRACE_FN,
830 FILTER_CPUMASK,
831 FILTER_COMM,
832 FILTER_CPU,
833 FILTER_STACKTRACE,
834 };
835
836 extern int trace_event_raw_init(struct trace_event_call *call);
837 extern int trace_define_field(struct trace_event_call *call, const char *type,
838 const char *name, int offset, int size,
839 int is_signed, int filter_type);
840 extern int trace_add_event_call(struct trace_event_call *call);
841 extern int trace_remove_event_call(struct trace_event_call *call);
842 extern int trace_event_get_offsets(struct trace_event_call *call);
843
844 int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
845 int trace_set_clr_event(const char *system, const char *event, int set);
846 int trace_array_set_clr_event(struct trace_array *tr, const char *system,
847 const char *event, bool enable);
848 /*
849 * The double __builtin_constant_p is because gcc will give us an error
850 * if we try to allocate the static variable to fmt if it is not a
851 * constant. Even with the outer if statement optimizing out.
852 */
853 #define event_trace_printk(ip, fmt, args...) \
854 do { \
855 __trace_printk_check_format(fmt, ##args); \
856 tracing_record_cmdline(current); \
857 if (__builtin_constant_p(fmt)) { \
858 static const char *trace_printk_fmt \
859 __section("__trace_printk_fmt") = \
860 __builtin_constant_p(fmt) ? fmt : NULL; \
861 \
862 __trace_bprintk(ip, trace_printk_fmt, ##args); \
863 } else \
864 __trace_printk(ip, fmt, ##args); \
865 } while (0)
866
867 #ifdef CONFIG_PERF_EVENTS
868 struct perf_event;
869
870 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
871
872 extern int perf_trace_init(struct perf_event *event);
873 extern void perf_trace_destroy(struct perf_event *event);
874 extern int perf_trace_add(struct perf_event *event, int flags);
875 extern void perf_trace_del(struct perf_event *event, int flags);
876 #ifdef CONFIG_KPROBE_EVENTS
877 extern int perf_kprobe_init(struct perf_event *event, bool is_retprobe);
878 extern void perf_kprobe_destroy(struct perf_event *event);
879 extern int bpf_get_kprobe_info(const struct perf_event *event,
880 u32 *fd_type, const char **symbol,
881 u64 *probe_offset, u64 *probe_addr,
882 unsigned long *missed,
883 bool perf_type_tracepoint);
884 #endif
885 #ifdef CONFIG_UPROBE_EVENTS
886 extern int perf_uprobe_init(struct perf_event *event,
887 unsigned long ref_ctr_offset, bool is_retprobe);
888 extern void perf_uprobe_destroy(struct perf_event *event);
889 extern int bpf_get_uprobe_info(const struct perf_event *event,
890 u32 *fd_type, const char **filename,
891 u64 *probe_offset, u64 *probe_addr,
892 bool perf_type_tracepoint);
893 #endif
894 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
895 char *filter_str);
896 extern void ftrace_profile_free_filter(struct perf_event *event);
897 void perf_trace_buf_update(void *record, u16 type);
898 void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
899
900 int perf_event_set_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);
901 void perf_event_free_bpf_prog(struct perf_event *event);
902
903 void bpf_trace_run1(struct bpf_raw_tp_link *link, u64 arg1);
904 void bpf_trace_run2(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2);
905 void bpf_trace_run3(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
906 u64 arg3);
907 void bpf_trace_run4(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
908 u64 arg3, u64 arg4);
909 void bpf_trace_run5(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
910 u64 arg3, u64 arg4, u64 arg5);
911 void bpf_trace_run6(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
912 u64 arg3, u64 arg4, u64 arg5, u64 arg6);
913 void bpf_trace_run7(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
914 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7);
915 void bpf_trace_run8(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
916 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
917 u64 arg8);
918 void bpf_trace_run9(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
919 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
920 u64 arg8, u64 arg9);
921 void bpf_trace_run10(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
922 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
923 u64 arg8, u64 arg9, u64 arg10);
924 void bpf_trace_run11(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
925 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
926 u64 arg8, u64 arg9, u64 arg10, u64 arg11);
927 void bpf_trace_run12(struct bpf_raw_tp_link *link, u64 arg1, u64 arg2,
928 u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
929 u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12);
930 void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
931 struct trace_event_call *call, u64 count,
932 struct pt_regs *regs, struct hlist_head *head,
933 struct task_struct *task);
934
935 static inline void
perf_trace_buf_submit(void * raw_data,int size,int rctx,u16 type,u64 count,struct pt_regs * regs,void * head,struct task_struct * task)936 perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
937 u64 count, struct pt_regs *regs, void *head,
938 struct task_struct *task)
939 {
940 perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
941 }
942
943 #endif
944
945 #define TRACE_EVENT_STR_MAX 512
946
947 /*
948 * gcc warns that you can not use a va_list in an inlined
949 * function. But lets me make it into a macro :-/
950 */
951 #define __trace_event_vstr_len(fmt, va) \
952 ({ \
953 va_list __ap; \
954 int __ret; \
955 \
956 va_copy(__ap, *(va)); \
957 __ret = vsnprintf(NULL, 0, fmt, __ap) + 1; \
958 va_end(__ap); \
959 \
960 min(__ret, TRACE_EVENT_STR_MAX); \
961 })
962
963 #endif /* _LINUX_TRACE_EVENT_H */
964
965 /*
966 * Note: we keep the TRACE_CUSTOM_EVENT outside the include file ifdef protection.
967 * This is due to the way trace custom events work. If a file includes two
968 * trace event headers under one "CREATE_CUSTOM_TRACE_EVENTS" the first include
969 * will override the TRACE_CUSTOM_EVENT and break the second include.
970 */
971
972 #ifndef TRACE_CUSTOM_EVENT
973
974 #define DECLARE_CUSTOM_EVENT_CLASS(name, proto, args, tstruct, assign, print)
975 #define DEFINE_CUSTOM_EVENT(template, name, proto, args)
976 #define TRACE_CUSTOM_EVENT(name, proto, args, struct, assign, print)
977
978 #endif /* ifdef TRACE_CUSTOM_EVENT (see note above) */
979