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