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_SPECIAL, 26 TRACE_MMIO_RW, 27 TRACE_MMIO_MAP, 28 TRACE_BRANCH, 29 TRACE_GRAPH_RET, 30 TRACE_GRAPH_ENT, 31 TRACE_USER_STACK, 32 TRACE_BLK, 33 TRACE_KSYM, 34 35 __TRACE_LAST_TYPE, 36 }; 37 38 39 #undef __field 40 #define __field(type, item) type item; 41 42 #undef __field_struct 43 #define __field_struct(type, item) __field(type, item) 44 45 #undef __field_desc 46 #define __field_desc(type, container, item) 47 48 #undef __array 49 #define __array(type, item, size) type item[size]; 50 51 #undef __array_desc 52 #define __array_desc(type, container, item, size) 53 54 #undef __dynamic_array 55 #define __dynamic_array(type, item) type item[]; 56 57 #undef F_STRUCT 58 #define F_STRUCT(args...) args 59 60 #undef FTRACE_ENTRY 61 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 62 struct struct_name { \ 63 struct trace_entry ent; \ 64 tstruct \ 65 } 66 67 #undef TP_ARGS 68 #define TP_ARGS(args...) args 69 70 #undef FTRACE_ENTRY_DUP 71 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 72 73 #include "trace_entries.h" 74 75 /* 76 * syscalls are special, and need special handling, this is why 77 * they are not included in trace_entries.h 78 */ 79 struct syscall_trace_enter { 80 struct trace_entry ent; 81 int nr; 82 unsigned long args[]; 83 }; 84 85 struct syscall_trace_exit { 86 struct trace_entry ent; 87 int nr; 88 long ret; 89 }; 90 91 struct kprobe_trace_entry_head { 92 struct trace_entry ent; 93 unsigned long ip; 94 }; 95 96 struct kretprobe_trace_entry_head { 97 struct trace_entry ent; 98 unsigned long func; 99 unsigned long ret_ip; 100 }; 101 102 /* 103 * trace_flag_type is an enumeration that holds different 104 * states when a trace occurs. These are: 105 * IRQS_OFF - interrupts were disabled 106 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 107 * NEED_RESCHED - reschedule is requested 108 * HARDIRQ - inside an interrupt handler 109 * SOFTIRQ - inside a softirq handler 110 */ 111 enum trace_flag_type { 112 TRACE_FLAG_IRQS_OFF = 0x01, 113 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 114 TRACE_FLAG_NEED_RESCHED = 0x04, 115 TRACE_FLAG_HARDIRQ = 0x08, 116 TRACE_FLAG_SOFTIRQ = 0x10, 117 }; 118 119 #define TRACE_BUF_SIZE 1024 120 121 /* 122 * The CPU trace array - it consists of thousands of trace entries 123 * plus some other descriptor data: (for example which task started 124 * the trace, etc.) 125 */ 126 struct trace_array_cpu { 127 atomic_t disabled; 128 void *buffer_page; /* ring buffer spare */ 129 130 unsigned long saved_latency; 131 unsigned long critical_start; 132 unsigned long critical_end; 133 unsigned long critical_sequence; 134 unsigned long nice; 135 unsigned long policy; 136 unsigned long rt_priority; 137 unsigned long skipped_entries; 138 cycle_t preempt_timestamp; 139 pid_t pid; 140 uid_t uid; 141 char comm[TASK_COMM_LEN]; 142 }; 143 144 /* 145 * The trace array - an array of per-CPU trace arrays. This is the 146 * highest level data structure that individual tracers deal with. 147 * They have on/off state as well: 148 */ 149 struct trace_array { 150 struct ring_buffer *buffer; 151 unsigned long entries; 152 int cpu; 153 cycle_t time_start; 154 struct task_struct *waiter; 155 struct trace_array_cpu *data[NR_CPUS]; 156 }; 157 158 #define FTRACE_CMP_TYPE(var, type) \ 159 __builtin_types_compatible_p(typeof(var), type *) 160 161 #undef IF_ASSIGN 162 #define IF_ASSIGN(var, entry, etype, id) \ 163 if (FTRACE_CMP_TYPE(var, etype)) { \ 164 var = (typeof(var))(entry); \ 165 WARN_ON(id && (entry)->type != id); \ 166 break; \ 167 } 168 169 /* Will cause compile errors if type is not found. */ 170 extern void __ftrace_bad_type(void); 171 172 /* 173 * The trace_assign_type is a verifier that the entry type is 174 * the same as the type being assigned. To add new types simply 175 * add a line with the following format: 176 * 177 * IF_ASSIGN(var, ent, type, id); 178 * 179 * Where "type" is the trace type that includes the trace_entry 180 * as the "ent" item. And "id" is the trace identifier that is 181 * used in the trace_type enum. 182 * 183 * If the type can have more than one id, then use zero. 184 */ 185 #define trace_assign_type(var, ent) \ 186 do { \ 187 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 188 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 189 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 190 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 191 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 192 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 193 IF_ASSIGN(var, ent, struct special_entry, 0); \ 194 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 195 TRACE_MMIO_RW); \ 196 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 197 TRACE_MMIO_MAP); \ 198 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 199 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 200 TRACE_GRAPH_ENT); \ 201 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 202 TRACE_GRAPH_RET); \ 203 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\ 204 __ftrace_bad_type(); \ 205 } while (0) 206 207 /* 208 * An option specific to a tracer. This is a boolean value. 209 * The bit is the bit index that sets its value on the 210 * flags value in struct tracer_flags. 211 */ 212 struct tracer_opt { 213 const char *name; /* Will appear on the trace_options file */ 214 u32 bit; /* Mask assigned in val field in tracer_flags */ 215 }; 216 217 /* 218 * The set of specific options for a tracer. Your tracer 219 * have to set the initial value of the flags val. 220 */ 221 struct tracer_flags { 222 u32 val; 223 struct tracer_opt *opts; 224 }; 225 226 /* Makes more easy to define a tracer opt */ 227 #define TRACER_OPT(s, b) .name = #s, .bit = b 228 229 230 /** 231 * struct tracer - a specific tracer and its callbacks to interact with debugfs 232 * @name: the name chosen to select it on the available_tracers file 233 * @init: called when one switches to this tracer (echo name > current_tracer) 234 * @reset: called when one switches to another tracer 235 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 236 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 237 * @open: called when the trace file is opened 238 * @pipe_open: called when the trace_pipe file is opened 239 * @wait_pipe: override how the user waits for traces on trace_pipe 240 * @close: called when the trace file is released 241 * @pipe_close: called when the trace_pipe file is released 242 * @read: override the default read callback on trace_pipe 243 * @splice_read: override the default splice_read callback on trace_pipe 244 * @selftest: selftest to run on boot (see trace_selftest.c) 245 * @print_headers: override the first lines that describe your columns 246 * @print_line: callback that prints a trace 247 * @set_flag: signals one of your private flags changed (trace_options file) 248 * @flags: your private flags 249 */ 250 struct tracer { 251 const char *name; 252 int (*init)(struct trace_array *tr); 253 void (*reset)(struct trace_array *tr); 254 void (*start)(struct trace_array *tr); 255 void (*stop)(struct trace_array *tr); 256 void (*open)(struct trace_iterator *iter); 257 void (*pipe_open)(struct trace_iterator *iter); 258 void (*wait_pipe)(struct trace_iterator *iter); 259 void (*close)(struct trace_iterator *iter); 260 void (*pipe_close)(struct trace_iterator *iter); 261 ssize_t (*read)(struct trace_iterator *iter, 262 struct file *filp, char __user *ubuf, 263 size_t cnt, loff_t *ppos); 264 ssize_t (*splice_read)(struct trace_iterator *iter, 265 struct file *filp, 266 loff_t *ppos, 267 struct pipe_inode_info *pipe, 268 size_t len, 269 unsigned int flags); 270 #ifdef CONFIG_FTRACE_STARTUP_TEST 271 int (*selftest)(struct tracer *trace, 272 struct trace_array *tr); 273 #endif 274 void (*print_header)(struct seq_file *m); 275 enum print_line_t (*print_line)(struct trace_iterator *iter); 276 /* If you handled the flag setting, return 0 */ 277 int (*set_flag)(u32 old_flags, u32 bit, int set); 278 struct tracer *next; 279 int print_max; 280 struct tracer_flags *flags; 281 }; 282 283 284 #define TRACE_PIPE_ALL_CPU -1 285 286 int tracer_init(struct tracer *t, struct trace_array *tr); 287 int tracing_is_enabled(void); 288 void trace_wake_up(void); 289 void tracing_reset(struct trace_array *tr, int cpu); 290 void tracing_reset_online_cpus(struct trace_array *tr); 291 void tracing_reset_current(int cpu); 292 void tracing_reset_current_online_cpus(void); 293 int tracing_open_generic(struct inode *inode, struct file *filp); 294 struct dentry *trace_create_file(const char *name, 295 mode_t mode, 296 struct dentry *parent, 297 void *data, 298 const struct file_operations *fops); 299 300 struct dentry *tracing_init_dentry(void); 301 void init_tracer_sysprof_debugfs(struct dentry *d_tracer); 302 303 struct ring_buffer_event; 304 305 struct ring_buffer_event * 306 trace_buffer_lock_reserve(struct ring_buffer *buffer, 307 int type, 308 unsigned long len, 309 unsigned long flags, 310 int pc); 311 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 312 struct ring_buffer_event *event, 313 unsigned long flags, int pc); 314 315 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 316 struct trace_array_cpu *data); 317 318 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 319 int *ent_cpu, u64 *ent_ts); 320 321 void default_wait_pipe(struct trace_iterator *iter); 322 void poll_wait_pipe(struct trace_iterator *iter); 323 324 void ftrace(struct trace_array *tr, 325 struct trace_array_cpu *data, 326 unsigned long ip, 327 unsigned long parent_ip, 328 unsigned long flags, int pc); 329 void tracing_sched_switch_trace(struct trace_array *tr, 330 struct task_struct *prev, 331 struct task_struct *next, 332 unsigned long flags, int pc); 333 334 void tracing_sched_wakeup_trace(struct trace_array *tr, 335 struct task_struct *wakee, 336 struct task_struct *cur, 337 unsigned long flags, int pc); 338 void trace_special(struct trace_array *tr, 339 struct trace_array_cpu *data, 340 unsigned long arg1, 341 unsigned long arg2, 342 unsigned long arg3, int pc); 343 void trace_function(struct trace_array *tr, 344 unsigned long ip, 345 unsigned long parent_ip, 346 unsigned long flags, int pc); 347 void trace_default_header(struct seq_file *m); 348 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 349 int trace_empty(struct trace_iterator *iter); 350 351 void trace_graph_return(struct ftrace_graph_ret *trace); 352 int trace_graph_entry(struct ftrace_graph_ent *trace); 353 void set_graph_array(struct trace_array *tr); 354 355 void tracing_start_cmdline_record(void); 356 void tracing_stop_cmdline_record(void); 357 void tracing_sched_switch_assign_trace(struct trace_array *tr); 358 void tracing_stop_sched_switch_record(void); 359 void tracing_start_sched_switch_record(void); 360 int register_tracer(struct tracer *type); 361 void unregister_tracer(struct tracer *type); 362 int is_tracing_stopped(void); 363 364 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr); 365 366 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 367 368 extern unsigned long tracing_thresh; 369 370 #ifdef CONFIG_TRACER_MAX_TRACE 371 extern unsigned long tracing_max_latency; 372 373 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 374 void update_max_tr_single(struct trace_array *tr, 375 struct task_struct *tsk, int cpu); 376 #endif /* CONFIG_TRACER_MAX_TRACE */ 377 378 #ifdef CONFIG_STACKTRACE 379 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 380 int skip, int pc); 381 382 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 383 int pc); 384 385 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 386 int pc); 387 #else 388 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 389 unsigned long flags, int skip, int pc) 390 { 391 } 392 393 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 394 unsigned long flags, int pc) 395 { 396 } 397 398 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 399 int skip, int pc) 400 { 401 } 402 #endif /* CONFIG_STACKTRACE */ 403 404 extern cycle_t ftrace_now(int cpu); 405 406 extern void trace_find_cmdline(int pid, char comm[]); 407 408 #ifdef CONFIG_DYNAMIC_FTRACE 409 extern unsigned long ftrace_update_tot_cnt; 410 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 411 extern int DYN_FTRACE_TEST_NAME(void); 412 #endif 413 414 extern int ring_buffer_expanded; 415 extern bool tracing_selftest_disabled; 416 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 417 418 #ifdef CONFIG_FTRACE_STARTUP_TEST 419 extern int trace_selftest_startup_function(struct tracer *trace, 420 struct trace_array *tr); 421 extern int trace_selftest_startup_function_graph(struct tracer *trace, 422 struct trace_array *tr); 423 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 424 struct trace_array *tr); 425 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 426 struct trace_array *tr); 427 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 428 struct trace_array *tr); 429 extern int trace_selftest_startup_wakeup(struct tracer *trace, 430 struct trace_array *tr); 431 extern int trace_selftest_startup_nop(struct tracer *trace, 432 struct trace_array *tr); 433 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 434 struct trace_array *tr); 435 extern int trace_selftest_startup_sysprof(struct tracer *trace, 436 struct trace_array *tr); 437 extern int trace_selftest_startup_branch(struct tracer *trace, 438 struct trace_array *tr); 439 extern int trace_selftest_startup_ksym(struct tracer *trace, 440 struct trace_array *tr); 441 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 442 443 extern void *head_page(struct trace_array_cpu *data); 444 extern unsigned long long ns2usecs(cycle_t nsec); 445 extern int 446 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 447 extern int 448 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 449 extern int 450 trace_array_vprintk(struct trace_array *tr, 451 unsigned long ip, const char *fmt, va_list args); 452 int trace_array_printk(struct trace_array *tr, 453 unsigned long ip, const char *fmt, ...); 454 455 extern unsigned long trace_flags; 456 457 extern int trace_clock_id; 458 459 /* Standard output formatting function used for function return traces */ 460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 461 462 /* Flag options */ 463 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 464 #define TRACE_GRAPH_PRINT_CPU 0x2 465 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 466 #define TRACE_GRAPH_PRINT_PROC 0x8 467 #define TRACE_GRAPH_PRINT_DURATION 0x10 468 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 469 470 extern enum print_line_t 471 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 472 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 473 extern enum print_line_t 474 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 475 extern void graph_trace_open(struct trace_iterator *iter); 476 extern void graph_trace_close(struct trace_iterator *iter); 477 extern int __trace_graph_entry(struct trace_array *tr, 478 struct ftrace_graph_ent *trace, 479 unsigned long flags, int pc); 480 extern void __trace_graph_return(struct trace_array *tr, 481 struct ftrace_graph_ret *trace, 482 unsigned long flags, int pc); 483 484 485 #ifdef CONFIG_DYNAMIC_FTRACE 486 /* TODO: make this variable */ 487 #define FTRACE_GRAPH_MAX_FUNCS 32 488 extern int ftrace_graph_filter_enabled; 489 extern int ftrace_graph_count; 490 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 491 492 static inline int ftrace_graph_addr(unsigned long addr) 493 { 494 int i; 495 496 if (!ftrace_graph_filter_enabled) 497 return 1; 498 499 for (i = 0; i < ftrace_graph_count; i++) { 500 if (addr == ftrace_graph_funcs[i]) 501 return 1; 502 } 503 504 return 0; 505 } 506 #else 507 static inline int ftrace_graph_addr(unsigned long addr) 508 { 509 return 1; 510 } 511 #endif /* CONFIG_DYNAMIC_FTRACE */ 512 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 513 static inline enum print_line_t 514 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 515 { 516 return TRACE_TYPE_UNHANDLED; 517 } 518 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 519 520 extern struct list_head ftrace_pids; 521 522 #ifdef CONFIG_FUNCTION_TRACER 523 static inline int ftrace_trace_task(struct task_struct *task) 524 { 525 if (list_empty(&ftrace_pids)) 526 return 1; 527 528 return test_tsk_trace_trace(task); 529 } 530 #else 531 static inline int ftrace_trace_task(struct task_struct *task) 532 { 533 return 1; 534 } 535 #endif 536 537 /* 538 * struct trace_parser - servers for reading the user input separated by spaces 539 * @cont: set if the input is not complete - no final space char was found 540 * @buffer: holds the parsed user input 541 * @idx: user input length 542 * @size: buffer size 543 */ 544 struct trace_parser { 545 bool cont; 546 char *buffer; 547 unsigned idx; 548 unsigned size; 549 }; 550 551 static inline bool trace_parser_loaded(struct trace_parser *parser) 552 { 553 return (parser->idx != 0); 554 } 555 556 static inline bool trace_parser_cont(struct trace_parser *parser) 557 { 558 return parser->cont; 559 } 560 561 static inline void trace_parser_clear(struct trace_parser *parser) 562 { 563 parser->cont = false; 564 parser->idx = 0; 565 } 566 567 extern int trace_parser_get_init(struct trace_parser *parser, int size); 568 extern void trace_parser_put(struct trace_parser *parser); 569 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 570 size_t cnt, loff_t *ppos); 571 572 /* 573 * trace_iterator_flags is an enumeration that defines bit 574 * positions into trace_flags that controls the output. 575 * 576 * NOTE: These bits must match the trace_options array in 577 * trace.c. 578 */ 579 enum trace_iterator_flags { 580 TRACE_ITER_PRINT_PARENT = 0x01, 581 TRACE_ITER_SYM_OFFSET = 0x02, 582 TRACE_ITER_SYM_ADDR = 0x04, 583 TRACE_ITER_VERBOSE = 0x08, 584 TRACE_ITER_RAW = 0x10, 585 TRACE_ITER_HEX = 0x20, 586 TRACE_ITER_BIN = 0x40, 587 TRACE_ITER_BLOCK = 0x80, 588 TRACE_ITER_STACKTRACE = 0x100, 589 TRACE_ITER_PRINTK = 0x200, 590 TRACE_ITER_PREEMPTONLY = 0x400, 591 TRACE_ITER_BRANCH = 0x800, 592 TRACE_ITER_ANNOTATE = 0x1000, 593 TRACE_ITER_USERSTACKTRACE = 0x2000, 594 TRACE_ITER_SYM_USEROBJ = 0x4000, 595 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 596 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 597 TRACE_ITER_LATENCY_FMT = 0x20000, 598 TRACE_ITER_SLEEP_TIME = 0x40000, 599 TRACE_ITER_GRAPH_TIME = 0x80000, 600 }; 601 602 /* 603 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 604 * control the output of kernel symbols. 605 */ 606 #define TRACE_ITER_SYM_MASK \ 607 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 608 609 extern struct tracer nop_trace; 610 611 #ifdef CONFIG_BRANCH_TRACER 612 extern int enable_branch_tracing(struct trace_array *tr); 613 extern void disable_branch_tracing(void); 614 static inline int trace_branch_enable(struct trace_array *tr) 615 { 616 if (trace_flags & TRACE_ITER_BRANCH) 617 return enable_branch_tracing(tr); 618 return 0; 619 } 620 static inline void trace_branch_disable(void) 621 { 622 /* due to races, always disable */ 623 disable_branch_tracing(); 624 } 625 #else 626 static inline int trace_branch_enable(struct trace_array *tr) 627 { 628 return 0; 629 } 630 static inline void trace_branch_disable(void) 631 { 632 } 633 #endif /* CONFIG_BRANCH_TRACER */ 634 635 /* set ring buffers to default size if not already done so */ 636 int tracing_update_buffers(void); 637 638 /* trace event type bit fields, not numeric */ 639 enum { 640 TRACE_EVENT_TYPE_PRINTF = 1, 641 TRACE_EVENT_TYPE_RAW = 2, 642 }; 643 644 struct ftrace_event_field { 645 struct list_head link; 646 char *name; 647 char *type; 648 int filter_type; 649 int offset; 650 int size; 651 int is_signed; 652 }; 653 654 struct event_filter { 655 int n_preds; 656 struct filter_pred **preds; 657 char *filter_string; 658 }; 659 660 struct event_subsystem { 661 struct list_head list; 662 const char *name; 663 struct dentry *entry; 664 struct event_filter *filter; 665 int nr_events; 666 }; 667 668 struct filter_pred; 669 struct regex; 670 671 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, 672 int val1, int val2); 673 674 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 675 676 enum regex_type { 677 MATCH_FULL = 0, 678 MATCH_FRONT_ONLY, 679 MATCH_MIDDLE_ONLY, 680 MATCH_END_ONLY, 681 }; 682 683 struct regex { 684 char pattern[MAX_FILTER_STR_VAL]; 685 int len; 686 int field_len; 687 regex_match_func match; 688 }; 689 690 struct filter_pred { 691 filter_pred_fn_t fn; 692 u64 val; 693 struct regex regex; 694 char *field_name; 695 int offset; 696 int not; 697 int op; 698 int pop_n; 699 }; 700 701 extern struct list_head ftrace_common_fields; 702 703 extern enum regex_type 704 filter_parse_regex(char *buff, int len, char **search, int *not); 705 extern void print_event_filter(struct ftrace_event_call *call, 706 struct trace_seq *s); 707 extern int apply_event_filter(struct ftrace_event_call *call, 708 char *filter_string); 709 extern int apply_subsystem_event_filter(struct event_subsystem *system, 710 char *filter_string); 711 extern void print_subsystem_event_filter(struct event_subsystem *system, 712 struct trace_seq *s); 713 extern int filter_assign_type(const char *type); 714 715 struct list_head * 716 trace_get_fields(struct ftrace_event_call *event_call); 717 718 static inline int 719 filter_check_discard(struct ftrace_event_call *call, void *rec, 720 struct ring_buffer *buffer, 721 struct ring_buffer_event *event) 722 { 723 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 724 !filter_match_preds(call->filter, rec)) { 725 ring_buffer_discard_commit(buffer, event); 726 return 1; 727 } 728 729 return 0; 730 } 731 732 extern struct mutex event_mutex; 733 extern struct list_head ftrace_events; 734 735 extern const char *__start___trace_bprintk_fmt[]; 736 extern const char *__stop___trace_bprintk_fmt[]; 737 738 #undef FTRACE_ENTRY 739 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 740 extern struct ftrace_event_call \ 741 __attribute__((__aligned__(4))) event_##call; 742 #undef FTRACE_ENTRY_DUP 743 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 744 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 745 #include "trace_entries.h" 746 747 #endif /* _LINUX_KERNEL_TRACE_H */ 748