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 16enum 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 */ 77struct syscall_trace_enter { 78 struct trace_entry ent; 79 int nr; 80 unsigned long args[]; 81}; 82 83struct syscall_trace_exit { 84 struct trace_entry ent; 85 int nr; 86 long ret; 87}; 88 89struct kprobe_trace_entry_head { 90 struct trace_entry ent; 91 unsigned long ip; 92}; 93 94struct 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 */ 109enum 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 */ 124struct 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 */ 147struct 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. */ 168extern 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 */ 208struct 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 */ 217struct 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 */ 246struct 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 283int tracer_init(struct tracer *t, struct trace_array *tr); 284int tracing_is_enabled(void); 285void trace_wake_up(void); 286void tracing_reset(struct trace_array *tr, int cpu); 287void tracing_reset_online_cpus(struct trace_array *tr); 288void tracing_reset_current(int cpu); 289void tracing_reset_current_online_cpus(void); 290int tracing_open_generic(struct inode *inode, struct file *filp); 291struct 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 297struct dentry *tracing_init_dentry(void); 298 299struct ring_buffer_event; 300 301struct ring_buffer_event * 302trace_buffer_lock_reserve(struct ring_buffer *buffer, 303 int type, 304 unsigned long len, 305 unsigned long flags, 306 int pc); 307void trace_buffer_unlock_commit(struct ring_buffer *buffer, 308 struct ring_buffer_event *event, 309 unsigned long flags, int pc); 310 311struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 312 struct trace_array_cpu *data); 313 314struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 315 int *ent_cpu, u64 *ent_ts); 316 317int trace_empty(struct trace_iterator *iter); 318 319void *trace_find_next_entry_inc(struct trace_iterator *iter); 320 321void trace_init_global_iter(struct trace_iterator *iter); 322 323void tracing_iter_reset(struct trace_iterator *iter, int cpu); 324 325void default_wait_pipe(struct trace_iterator *iter); 326void poll_wait_pipe(struct trace_iterator *iter); 327 328void 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); 333void 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 338void tracing_sched_wakeup_trace(struct trace_array *tr, 339 struct task_struct *wakee, 340 struct task_struct *cur, 341 unsigned long flags, int pc); 342void trace_function(struct trace_array *tr, 343 unsigned long ip, 344 unsigned long parent_ip, 345 unsigned long flags, int pc); 346void trace_default_header(struct seq_file *m); 347void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 348int trace_empty(struct trace_iterator *iter); 349 350void trace_graph_return(struct ftrace_graph_ret *trace); 351int trace_graph_entry(struct ftrace_graph_ent *trace); 352void set_graph_array(struct trace_array *tr); 353 354void tracing_start_cmdline_record(void); 355void tracing_stop_cmdline_record(void); 356void tracing_sched_switch_assign_trace(struct trace_array *tr); 357void tracing_stop_sched_switch_record(void); 358void tracing_start_sched_switch_record(void); 359int register_tracer(struct tracer *type); 360void unregister_tracer(struct tracer *type); 361int is_tracing_stopped(void); 362enum trace_file_type { 363 TRACE_FILE_LAT_FMT = 1, 364 TRACE_FILE_ANNOTATE = 2, 365}; 366 367extern 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 372extern unsigned long nsecs_to_usecs(unsigned long nsecs); 373 374extern unsigned long tracing_thresh; 375 376#ifdef CONFIG_TRACER_MAX_TRACE 377extern unsigned long tracing_max_latency; 378 379void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 380void 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 385void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 386 int skip, int pc); 387 388void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 389 int pc); 390 391void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 392 int pc); 393#else 394static inline void ftrace_trace_stack(struct ring_buffer *buffer, 395 unsigned long flags, int skip, int pc) 396{ 397} 398 399static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 400 unsigned long flags, int pc) 401{ 402} 403 404static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 405 int skip, int pc) 406{ 407} 408#endif /* CONFIG_STACKTRACE */ 409 410extern cycle_t ftrace_now(int cpu); 411 412extern void trace_find_cmdline(int pid, char comm[]); 413 414#ifdef CONFIG_DYNAMIC_FTRACE 415extern unsigned long ftrace_update_tot_cnt; 416#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 417extern int DYN_FTRACE_TEST_NAME(void); 418#endif 419 420extern int ring_buffer_expanded; 421extern bool tracing_selftest_disabled; 422DECLARE_PER_CPU(int, ftrace_cpu_disabled); 423 424#ifdef CONFIG_FTRACE_STARTUP_TEST 425extern int trace_selftest_startup_function(struct tracer *trace, 426 struct trace_array *tr); 427extern int trace_selftest_startup_function_graph(struct tracer *trace, 428 struct trace_array *tr); 429extern int trace_selftest_startup_irqsoff(struct tracer *trace, 430 struct trace_array *tr); 431extern int trace_selftest_startup_preemptoff(struct tracer *trace, 432 struct trace_array *tr); 433extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 434 struct trace_array *tr); 435extern int trace_selftest_startup_wakeup(struct tracer *trace, 436 struct trace_array *tr); 437extern int trace_selftest_startup_nop(struct tracer *trace, 438 struct trace_array *tr); 439extern int trace_selftest_startup_sched_switch(struct tracer *trace, 440 struct trace_array *tr); 441extern int trace_selftest_startup_branch(struct tracer *trace, 442 struct trace_array *tr); 443#endif /* CONFIG_FTRACE_STARTUP_TEST */ 444 445extern void *head_page(struct trace_array_cpu *data); 446extern unsigned long long ns2usecs(cycle_t nsec); 447extern int 448trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 449extern int 450trace_vprintk(unsigned long ip, const char *fmt, va_list args); 451extern int 452trace_array_vprintk(struct trace_array *tr, 453 unsigned long ip, const char *fmt, va_list args); 454int trace_array_printk(struct trace_array *tr, 455 unsigned long ip, const char *fmt, ...); 456void trace_printk_seq(struct trace_seq *s); 457enum print_line_t print_trace_line(struct trace_iterator *iter); 458 459extern unsigned long trace_flags; 460 461extern 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 474extern enum print_line_t 475print_graph_function_flags(struct trace_iterator *iter, u32 flags); 476extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 477extern enum print_line_t 478trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 479extern void graph_trace_open(struct trace_iterator *iter); 480extern void graph_trace_close(struct trace_iterator *iter); 481extern int __trace_graph_entry(struct trace_array *tr, 482 struct ftrace_graph_ent *trace, 483 unsigned long flags, int pc); 484extern 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 492extern int ftrace_graph_filter_enabled; 493extern int ftrace_graph_count; 494extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 495 496static 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 511static inline int ftrace_graph_addr(unsigned long addr) 512{ 513 return 1; 514} 515#endif /* CONFIG_DYNAMIC_FTRACE */ 516#else /* CONFIG_FUNCTION_GRAPH_TRACER */ 517static inline enum print_line_t 518print_graph_function_flags(struct trace_iterator *iter, u32 flags) 519{ 520 return TRACE_TYPE_UNHANDLED; 521} 522#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 523 524extern struct list_head ftrace_pids; 525 526#ifdef CONFIG_FUNCTION_TRACER 527static 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 535static 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 */ 548struct trace_parser { 549 bool cont; 550 char *buffer; 551 unsigned idx; 552 unsigned size; 553}; 554 555static inline bool trace_parser_loaded(struct trace_parser *parser) 556{ 557 return (parser->idx != 0); 558} 559 560static inline bool trace_parser_cont(struct trace_parser *parser) 561{ 562 return parser->cont; 563} 564 565static inline void trace_parser_clear(struct trace_parser *parser) 566{ 567 parser->cont = false; 568 parser->idx = 0; 569} 570 571extern int trace_parser_get_init(struct trace_parser *parser, int size); 572extern void trace_parser_put(struct trace_parser *parser); 573extern 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 */ 583enum 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 614extern struct tracer nop_trace; 615 616#ifdef CONFIG_BRANCH_TRACER 617extern int enable_branch_tracing(struct trace_array *tr); 618extern void disable_branch_tracing(void); 619static 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} 625static inline void trace_branch_disable(void) 626{ 627 /* due to races, always disable */ 628 disable_branch_tracing(); 629} 630#else 631static inline int trace_branch_enable(struct trace_array *tr) 632{ 633 return 0; 634} 635static 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 */ 641int tracing_update_buffers(void); 642 643/* trace event type bit fields, not numeric */ 644enum { 645 TRACE_EVENT_TYPE_PRINTF = 1, 646 TRACE_EVENT_TYPE_RAW = 2, 647}; 648 649struct 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 659struct event_filter { 660 int n_preds; 661 struct filter_pred **preds; 662 char *filter_string; 663}; 664 665struct 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 673struct filter_pred; 674struct regex; 675 676typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, 677 int val1, int val2); 678 679typedef int (*regex_match_func)(char *str, struct regex *r, int len); 680 681enum regex_type { 682 MATCH_FULL = 0, 683 MATCH_FRONT_ONLY, 684 MATCH_MIDDLE_ONLY, 685 MATCH_END_ONLY, 686}; 687 688struct regex { 689 char pattern[MAX_FILTER_STR_VAL]; 690 int len; 691 int field_len; 692 regex_match_func match; 693}; 694 695struct 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 706extern struct list_head ftrace_common_fields; 707 708extern enum regex_type 709filter_parse_regex(char *buff, int len, char **search, int *not); 710extern void print_event_filter(struct ftrace_event_call *call, 711 struct trace_seq *s); 712extern int apply_event_filter(struct ftrace_event_call *call, 713 char *filter_string); 714extern int apply_subsystem_event_filter(struct event_subsystem *system, 715 char *filter_string); 716extern void print_subsystem_event_filter(struct event_subsystem *system, 717 struct trace_seq *s); 718extern int filter_assign_type(const char *type); 719 720struct list_head * 721trace_get_fields(struct ftrace_event_call *event_call); 722 723static inline int 724filter_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 737extern void trace_event_enable_cmd_record(bool enable); 738 739extern struct mutex event_mutex; 740extern struct list_head ftrace_events; 741 742extern const char *__start___trace_bprintk_fmt[]; 743extern 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