1 #ifndef _LINUX_KERNEL_TRACE_H 2 #define _LINUX_KERNEL_TRACE_H 3 4 #include <linux/fs.h> 5 #include <asm/atomic.h> 6 #include <linux/sched.h> 7 #include <linux/clocksource.h> 8 #include <linux/ring_buffer.h> 9 #include <linux/mmiotrace.h> 10 #include <linux/tracepoint.h> 11 #include <linux/ftrace.h> 12 #include <linux/hw_breakpoint.h> 13 #include <linux/trace_seq.h> 14 #include <linux/ftrace_event.h> 15 16 enum trace_type { 17 __TRACE_FIRST_TYPE = 0, 18 19 TRACE_FN, 20 TRACE_CTX, 21 TRACE_WAKE, 22 TRACE_STACK, 23 TRACE_PRINT, 24 TRACE_BPRINT, 25 TRACE_MMIO_RW, 26 TRACE_MMIO_MAP, 27 TRACE_BRANCH, 28 TRACE_GRAPH_RET, 29 TRACE_GRAPH_ENT, 30 TRACE_USER_STACK, 31 TRACE_BLK, 32 33 __TRACE_LAST_TYPE, 34 }; 35 36 37 #undef __field 38 #define __field(type, item) type item; 39 40 #undef __field_struct 41 #define __field_struct(type, item) __field(type, item) 42 43 #undef __field_desc 44 #define __field_desc(type, container, item) 45 46 #undef __array 47 #define __array(type, item, size) type item[size]; 48 49 #undef __array_desc 50 #define __array_desc(type, container, item, size) 51 52 #undef __dynamic_array 53 #define __dynamic_array(type, item) type item[]; 54 55 #undef F_STRUCT 56 #define F_STRUCT(args...) args 57 58 #undef FTRACE_ENTRY 59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 60 struct struct_name { \ 61 struct trace_entry ent; \ 62 tstruct \ 63 } 64 65 #undef TP_ARGS 66 #define TP_ARGS(args...) args 67 68 #undef FTRACE_ENTRY_DUP 69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 70 71 #include "trace_entries.h" 72 73 /* 74 * syscalls are special, and need special handling, this is why 75 * they are not included in trace_entries.h 76 */ 77 struct syscall_trace_enter { 78 struct trace_entry ent; 79 int nr; 80 unsigned long args[]; 81 }; 82 83 struct syscall_trace_exit { 84 struct trace_entry ent; 85 int nr; 86 long ret; 87 }; 88 89 struct kprobe_trace_entry_head { 90 struct trace_entry ent; 91 unsigned long ip; 92 }; 93 94 struct kretprobe_trace_entry_head { 95 struct trace_entry ent; 96 unsigned long func; 97 unsigned long ret_ip; 98 }; 99 100 /* 101 * trace_flag_type is an enumeration that holds different 102 * states when a trace occurs. These are: 103 * IRQS_OFF - interrupts were disabled 104 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 105 * NEED_RESCHED - reschedule is requested 106 * HARDIRQ - inside an interrupt handler 107 * SOFTIRQ - inside a softirq handler 108 */ 109 enum trace_flag_type { 110 TRACE_FLAG_IRQS_OFF = 0x01, 111 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 112 TRACE_FLAG_NEED_RESCHED = 0x04, 113 TRACE_FLAG_HARDIRQ = 0x08, 114 TRACE_FLAG_SOFTIRQ = 0x10, 115 }; 116 117 #define TRACE_BUF_SIZE 1024 118 119 /* 120 * The CPU trace array - it consists of thousands of trace entries 121 * plus some other descriptor data: (for example which task started 122 * the trace, etc.) 123 */ 124 struct trace_array_cpu { 125 atomic_t disabled; 126 void *buffer_page; /* ring buffer spare */ 127 128 unsigned long saved_latency; 129 unsigned long critical_start; 130 unsigned long critical_end; 131 unsigned long critical_sequence; 132 unsigned long nice; 133 unsigned long policy; 134 unsigned long rt_priority; 135 unsigned long skipped_entries; 136 cycle_t preempt_timestamp; 137 pid_t pid; 138 uid_t uid; 139 char comm[TASK_COMM_LEN]; 140 }; 141 142 /* 143 * The trace array - an array of per-CPU trace arrays. This is the 144 * highest level data structure that individual tracers deal with. 145 * They have on/off state as well: 146 */ 147 struct trace_array { 148 struct ring_buffer *buffer; 149 unsigned long entries; 150 int cpu; 151 cycle_t time_start; 152 struct task_struct *waiter; 153 struct trace_array_cpu *data[NR_CPUS]; 154 }; 155 156 #define FTRACE_CMP_TYPE(var, type) \ 157 __builtin_types_compatible_p(typeof(var), type *) 158 159 #undef IF_ASSIGN 160 #define IF_ASSIGN(var, entry, etype, id) \ 161 if (FTRACE_CMP_TYPE(var, etype)) { \ 162 var = (typeof(var))(entry); \ 163 WARN_ON(id && (entry)->type != id); \ 164 break; \ 165 } 166 167 /* Will cause compile errors if type is not found. */ 168 extern void __ftrace_bad_type(void); 169 170 /* 171 * The trace_assign_type is a verifier that the entry type is 172 * the same as the type being assigned. To add new types simply 173 * add a line with the following format: 174 * 175 * IF_ASSIGN(var, ent, type, id); 176 * 177 * Where "type" is the trace type that includes the trace_entry 178 * as the "ent" item. And "id" is the trace identifier that is 179 * used in the trace_type enum. 180 * 181 * If the type can have more than one id, then use zero. 182 */ 183 #define trace_assign_type(var, ent) \ 184 do { \ 185 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 186 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 187 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 188 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 189 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 190 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 191 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 192 TRACE_MMIO_RW); \ 193 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 194 TRACE_MMIO_MAP); \ 195 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 196 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 197 TRACE_GRAPH_ENT); \ 198 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 199 TRACE_GRAPH_RET); \ 200 __ftrace_bad_type(); \ 201 } while (0) 202 203 /* 204 * An option specific to a tracer. This is a boolean value. 205 * The bit is the bit index that sets its value on the 206 * flags value in struct tracer_flags. 207 */ 208 struct tracer_opt { 209 const char *name; /* Will appear on the trace_options file */ 210 u32 bit; /* Mask assigned in val field in tracer_flags */ 211 }; 212 213 /* 214 * The set of specific options for a tracer. Your tracer 215 * have to set the initial value of the flags val. 216 */ 217 struct tracer_flags { 218 u32 val; 219 struct tracer_opt *opts; 220 }; 221 222 /* Makes more easy to define a tracer opt */ 223 #define TRACER_OPT(s, b) .name = #s, .bit = b 224 225 226 /** 227 * struct tracer - a specific tracer and its callbacks to interact with debugfs 228 * @name: the name chosen to select it on the available_tracers file 229 * @init: called when one switches to this tracer (echo name > current_tracer) 230 * @reset: called when one switches to another tracer 231 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 232 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 233 * @open: called when the trace file is opened 234 * @pipe_open: called when the trace_pipe file is opened 235 * @wait_pipe: override how the user waits for traces on trace_pipe 236 * @close: called when the trace file is released 237 * @pipe_close: called when the trace_pipe file is released 238 * @read: override the default read callback on trace_pipe 239 * @splice_read: override the default splice_read callback on trace_pipe 240 * @selftest: selftest to run on boot (see trace_selftest.c) 241 * @print_headers: override the first lines that describe your columns 242 * @print_line: callback that prints a trace 243 * @set_flag: signals one of your private flags changed (trace_options file) 244 * @flags: your private flags 245 */ 246 struct tracer { 247 const char *name; 248 int (*init)(struct trace_array *tr); 249 void (*reset)(struct trace_array *tr); 250 void (*start)(struct trace_array *tr); 251 void (*stop)(struct trace_array *tr); 252 void (*open)(struct trace_iterator *iter); 253 void (*pipe_open)(struct trace_iterator *iter); 254 void (*wait_pipe)(struct trace_iterator *iter); 255 void (*close)(struct trace_iterator *iter); 256 void (*pipe_close)(struct trace_iterator *iter); 257 ssize_t (*read)(struct trace_iterator *iter, 258 struct file *filp, char __user *ubuf, 259 size_t cnt, loff_t *ppos); 260 ssize_t (*splice_read)(struct trace_iterator *iter, 261 struct file *filp, 262 loff_t *ppos, 263 struct pipe_inode_info *pipe, 264 size_t len, 265 unsigned int flags); 266 #ifdef CONFIG_FTRACE_STARTUP_TEST 267 int (*selftest)(struct tracer *trace, 268 struct trace_array *tr); 269 #endif 270 void (*print_header)(struct seq_file *m); 271 enum print_line_t (*print_line)(struct trace_iterator *iter); 272 /* If you handled the flag setting, return 0 */ 273 int (*set_flag)(u32 old_flags, u32 bit, int set); 274 struct tracer *next; 275 int print_max; 276 struct tracer_flags *flags; 277 int use_max_tr; 278 }; 279 280 281 #define TRACE_PIPE_ALL_CPU -1 282 283 int tracer_init(struct tracer *t, struct trace_array *tr); 284 int tracing_is_enabled(void); 285 void trace_wake_up(void); 286 void tracing_reset(struct trace_array *tr, int cpu); 287 void tracing_reset_online_cpus(struct trace_array *tr); 288 void tracing_reset_current(int cpu); 289 void tracing_reset_current_online_cpus(void); 290 int tracing_open_generic(struct inode *inode, struct file *filp); 291 struct dentry *trace_create_file(const char *name, 292 mode_t mode, 293 struct dentry *parent, 294 void *data, 295 const struct file_operations *fops); 296 297 struct dentry *tracing_init_dentry(void); 298 299 struct ring_buffer_event; 300 301 struct ring_buffer_event * 302 trace_buffer_lock_reserve(struct ring_buffer *buffer, 303 int type, 304 unsigned long len, 305 unsigned long flags, 306 int pc); 307 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 308 struct ring_buffer_event *event, 309 unsigned long flags, int pc); 310 311 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 312 struct trace_array_cpu *data); 313 314 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 315 int *ent_cpu, u64 *ent_ts); 316 317 int trace_empty(struct trace_iterator *iter); 318 319 void *trace_find_next_entry_inc(struct trace_iterator *iter); 320 321 void trace_init_global_iter(struct trace_iterator *iter); 322 323 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 324 325 void default_wait_pipe(struct trace_iterator *iter); 326 void poll_wait_pipe(struct trace_iterator *iter); 327 328 void ftrace(struct trace_array *tr, 329 struct trace_array_cpu *data, 330 unsigned long ip, 331 unsigned long parent_ip, 332 unsigned long flags, int pc); 333 void tracing_sched_switch_trace(struct trace_array *tr, 334 struct task_struct *prev, 335 struct task_struct *next, 336 unsigned long flags, int pc); 337 338 void tracing_sched_wakeup_trace(struct trace_array *tr, 339 struct task_struct *wakee, 340 struct task_struct *cur, 341 unsigned long flags, int pc); 342 void trace_function(struct trace_array *tr, 343 unsigned long ip, 344 unsigned long parent_ip, 345 unsigned long flags, int pc); 346 void trace_default_header(struct seq_file *m); 347 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 348 int trace_empty(struct trace_iterator *iter); 349 350 void trace_graph_return(struct ftrace_graph_ret *trace); 351 int trace_graph_entry(struct ftrace_graph_ent *trace); 352 void set_graph_array(struct trace_array *tr); 353 354 void tracing_start_cmdline_record(void); 355 void tracing_stop_cmdline_record(void); 356 void tracing_sched_switch_assign_trace(struct trace_array *tr); 357 void tracing_stop_sched_switch_record(void); 358 void tracing_start_sched_switch_record(void); 359 int register_tracer(struct tracer *type); 360 void unregister_tracer(struct tracer *type); 361 int is_tracing_stopped(void); 362 enum trace_file_type { 363 TRACE_FILE_LAT_FMT = 1, 364 TRACE_FILE_ANNOTATE = 2, 365 }; 366 367 extern cpumask_var_t __read_mostly tracing_buffer_mask; 368 369 #define for_each_tracing_cpu(cpu) \ 370 for_each_cpu(cpu, tracing_buffer_mask) 371 372 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 373 374 extern unsigned long tracing_thresh; 375 376 #ifdef CONFIG_TRACER_MAX_TRACE 377 extern unsigned long tracing_max_latency; 378 379 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 380 void update_max_tr_single(struct trace_array *tr, 381 struct task_struct *tsk, int cpu); 382 #endif /* CONFIG_TRACER_MAX_TRACE */ 383 384 #ifdef CONFIG_STACKTRACE 385 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 386 int skip, int pc); 387 388 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 389 int pc); 390 391 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 392 int pc); 393 #else 394 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 395 unsigned long flags, int skip, int pc) 396 { 397 } 398 399 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 400 unsigned long flags, int pc) 401 { 402 } 403 404 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 405 int skip, int pc) 406 { 407 } 408 #endif /* CONFIG_STACKTRACE */ 409 410 extern cycle_t ftrace_now(int cpu); 411 412 extern void trace_find_cmdline(int pid, char comm[]); 413 414 #ifdef CONFIG_DYNAMIC_FTRACE 415 extern unsigned long ftrace_update_tot_cnt; 416 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 417 extern int DYN_FTRACE_TEST_NAME(void); 418 #endif 419 420 extern int ring_buffer_expanded; 421 extern bool tracing_selftest_disabled; 422 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 423 424 #ifdef CONFIG_FTRACE_STARTUP_TEST 425 extern int trace_selftest_startup_function(struct tracer *trace, 426 struct trace_array *tr); 427 extern int trace_selftest_startup_function_graph(struct tracer *trace, 428 struct trace_array *tr); 429 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 430 struct trace_array *tr); 431 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 432 struct trace_array *tr); 433 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 434 struct trace_array *tr); 435 extern int trace_selftest_startup_wakeup(struct tracer *trace, 436 struct trace_array *tr); 437 extern int trace_selftest_startup_nop(struct tracer *trace, 438 struct trace_array *tr); 439 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 440 struct trace_array *tr); 441 extern int trace_selftest_startup_branch(struct tracer *trace, 442 struct trace_array *tr); 443 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 444 445 extern void *head_page(struct trace_array_cpu *data); 446 extern unsigned long long ns2usecs(cycle_t nsec); 447 extern int 448 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 449 extern int 450 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 451 extern int 452 trace_array_vprintk(struct trace_array *tr, 453 unsigned long ip, const char *fmt, va_list args); 454 int trace_array_printk(struct trace_array *tr, 455 unsigned long ip, const char *fmt, ...); 456 void trace_printk_seq(struct trace_seq *s); 457 enum print_line_t print_trace_line(struct trace_iterator *iter); 458 459 extern unsigned long trace_flags; 460 461 extern int trace_clock_id; 462 463 /* Standard output formatting function used for function return traces */ 464 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 465 466 /* Flag options */ 467 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 468 #define TRACE_GRAPH_PRINT_CPU 0x2 469 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 470 #define TRACE_GRAPH_PRINT_PROC 0x8 471 #define TRACE_GRAPH_PRINT_DURATION 0x10 472 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 473 474 extern enum print_line_t 475 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 476 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 477 extern enum print_line_t 478 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 479 extern void graph_trace_open(struct trace_iterator *iter); 480 extern void graph_trace_close(struct trace_iterator *iter); 481 extern int __trace_graph_entry(struct trace_array *tr, 482 struct ftrace_graph_ent *trace, 483 unsigned long flags, int pc); 484 extern void __trace_graph_return(struct trace_array *tr, 485 struct ftrace_graph_ret *trace, 486 unsigned long flags, int pc); 487 488 489 #ifdef CONFIG_DYNAMIC_FTRACE 490 /* TODO: make this variable */ 491 #define FTRACE_GRAPH_MAX_FUNCS 32 492 extern int ftrace_graph_filter_enabled; 493 extern int ftrace_graph_count; 494 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 495 496 static inline int ftrace_graph_addr(unsigned long addr) 497 { 498 int i; 499 500 if (!ftrace_graph_filter_enabled) 501 return 1; 502 503 for (i = 0; i < ftrace_graph_count; i++) { 504 if (addr == ftrace_graph_funcs[i]) 505 return 1; 506 } 507 508 return 0; 509 } 510 #else 511 static inline int ftrace_graph_addr(unsigned long addr) 512 { 513 return 1; 514 } 515 #endif /* CONFIG_DYNAMIC_FTRACE */ 516 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 517 static inline enum print_line_t 518 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 519 { 520 return TRACE_TYPE_UNHANDLED; 521 } 522 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 523 524 extern struct list_head ftrace_pids; 525 526 #ifdef CONFIG_FUNCTION_TRACER 527 static inline int ftrace_trace_task(struct task_struct *task) 528 { 529 if (list_empty(&ftrace_pids)) 530 return 1; 531 532 return test_tsk_trace_trace(task); 533 } 534 #else 535 static inline int ftrace_trace_task(struct task_struct *task) 536 { 537 return 1; 538 } 539 #endif 540 541 /* 542 * struct trace_parser - servers for reading the user input separated by spaces 543 * @cont: set if the input is not complete - no final space char was found 544 * @buffer: holds the parsed user input 545 * @idx: user input length 546 * @size: buffer size 547 */ 548 struct trace_parser { 549 bool cont; 550 char *buffer; 551 unsigned idx; 552 unsigned size; 553 }; 554 555 static inline bool trace_parser_loaded(struct trace_parser *parser) 556 { 557 return (parser->idx != 0); 558 } 559 560 static inline bool trace_parser_cont(struct trace_parser *parser) 561 { 562 return parser->cont; 563 } 564 565 static inline void trace_parser_clear(struct trace_parser *parser) 566 { 567 parser->cont = false; 568 parser->idx = 0; 569 } 570 571 extern int trace_parser_get_init(struct trace_parser *parser, int size); 572 extern void trace_parser_put(struct trace_parser *parser); 573 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 574 size_t cnt, loff_t *ppos); 575 576 /* 577 * trace_iterator_flags is an enumeration that defines bit 578 * positions into trace_flags that controls the output. 579 * 580 * NOTE: These bits must match the trace_options array in 581 * trace.c. 582 */ 583 enum trace_iterator_flags { 584 TRACE_ITER_PRINT_PARENT = 0x01, 585 TRACE_ITER_SYM_OFFSET = 0x02, 586 TRACE_ITER_SYM_ADDR = 0x04, 587 TRACE_ITER_VERBOSE = 0x08, 588 TRACE_ITER_RAW = 0x10, 589 TRACE_ITER_HEX = 0x20, 590 TRACE_ITER_BIN = 0x40, 591 TRACE_ITER_BLOCK = 0x80, 592 TRACE_ITER_STACKTRACE = 0x100, 593 TRACE_ITER_PRINTK = 0x200, 594 TRACE_ITER_PREEMPTONLY = 0x400, 595 TRACE_ITER_BRANCH = 0x800, 596 TRACE_ITER_ANNOTATE = 0x1000, 597 TRACE_ITER_USERSTACKTRACE = 0x2000, 598 TRACE_ITER_SYM_USEROBJ = 0x4000, 599 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 600 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 601 TRACE_ITER_LATENCY_FMT = 0x20000, 602 TRACE_ITER_SLEEP_TIME = 0x40000, 603 TRACE_ITER_GRAPH_TIME = 0x80000, 604 TRACE_ITER_RECORD_CMD = 0x100000, 605 }; 606 607 /* 608 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 609 * control the output of kernel symbols. 610 */ 611 #define TRACE_ITER_SYM_MASK \ 612 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 613 614 extern struct tracer nop_trace; 615 616 #ifdef CONFIG_BRANCH_TRACER 617 extern int enable_branch_tracing(struct trace_array *tr); 618 extern void disable_branch_tracing(void); 619 static inline int trace_branch_enable(struct trace_array *tr) 620 { 621 if (trace_flags & TRACE_ITER_BRANCH) 622 return enable_branch_tracing(tr); 623 return 0; 624 } 625 static inline void trace_branch_disable(void) 626 { 627 /* due to races, always disable */ 628 disable_branch_tracing(); 629 } 630 #else 631 static inline int trace_branch_enable(struct trace_array *tr) 632 { 633 return 0; 634 } 635 static inline void trace_branch_disable(void) 636 { 637 } 638 #endif /* CONFIG_BRANCH_TRACER */ 639 640 /* set ring buffers to default size if not already done so */ 641 int tracing_update_buffers(void); 642 643 /* trace event type bit fields, not numeric */ 644 enum { 645 TRACE_EVENT_TYPE_PRINTF = 1, 646 TRACE_EVENT_TYPE_RAW = 2, 647 }; 648 649 struct ftrace_event_field { 650 struct list_head link; 651 char *name; 652 char *type; 653 int filter_type; 654 int offset; 655 int size; 656 int is_signed; 657 }; 658 659 struct event_filter { 660 int n_preds; 661 struct filter_pred **preds; 662 char *filter_string; 663 }; 664 665 struct event_subsystem { 666 struct list_head list; 667 const char *name; 668 struct dentry *entry; 669 struct event_filter *filter; 670 int nr_events; 671 }; 672 673 struct filter_pred; 674 struct regex; 675 676 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, 677 int val1, int val2); 678 679 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 680 681 enum regex_type { 682 MATCH_FULL = 0, 683 MATCH_FRONT_ONLY, 684 MATCH_MIDDLE_ONLY, 685 MATCH_END_ONLY, 686 }; 687 688 struct regex { 689 char pattern[MAX_FILTER_STR_VAL]; 690 int len; 691 int field_len; 692 regex_match_func match; 693 }; 694 695 struct filter_pred { 696 filter_pred_fn_t fn; 697 u64 val; 698 struct regex regex; 699 char *field_name; 700 int offset; 701 int not; 702 int op; 703 int pop_n; 704 }; 705 706 extern struct list_head ftrace_common_fields; 707 708 extern enum regex_type 709 filter_parse_regex(char *buff, int len, char **search, int *not); 710 extern void print_event_filter(struct ftrace_event_call *call, 711 struct trace_seq *s); 712 extern int apply_event_filter(struct ftrace_event_call *call, 713 char *filter_string); 714 extern int apply_subsystem_event_filter(struct event_subsystem *system, 715 char *filter_string); 716 extern void print_subsystem_event_filter(struct event_subsystem *system, 717 struct trace_seq *s); 718 extern int filter_assign_type(const char *type); 719 720 struct list_head * 721 trace_get_fields(struct ftrace_event_call *event_call); 722 723 static inline int 724 filter_check_discard(struct ftrace_event_call *call, void *rec, 725 struct ring_buffer *buffer, 726 struct ring_buffer_event *event) 727 { 728 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 729 !filter_match_preds(call->filter, rec)) { 730 ring_buffer_discard_commit(buffer, event); 731 return 1; 732 } 733 734 return 0; 735 } 736 737 extern void trace_event_enable_cmd_record(bool enable); 738 739 extern struct mutex event_mutex; 740 extern struct list_head ftrace_events; 741 742 extern const char *__start___trace_bprintk_fmt[]; 743 extern const char *__stop___trace_bprintk_fmt[]; 744 745 #undef FTRACE_ENTRY 746 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 747 extern struct ftrace_event_call \ 748 __attribute__((__aligned__(4))) event_##call; 749 #undef FTRACE_ENTRY_DUP 750 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 751 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 752 #include "trace_entries.h" 753 754 #endif /* _LINUX_KERNEL_TRACE_H */ 755