1 #ifndef _LINUX_KERNEL_TRACE_H 2 #define _LINUX_KERNEL_TRACE_H 3 4 #include <linux/fs.h> 5 #include <linux/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 struct tracer_flags *flags; 276 int print_max; 277 int use_max_tr; 278 }; 279 280 281 /* Only current can touch trace_recursion */ 282 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0) 283 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0) 284 285 /* Ring buffer has the 10 LSB bits to count */ 286 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff) 287 288 /* for function tracing recursion */ 289 #define TRACE_INTERNAL_BIT (1<<11) 290 #define TRACE_GLOBAL_BIT (1<<12) 291 /* 292 * Abuse of the trace_recursion. 293 * As we need a way to maintain state if we are tracing the function 294 * graph in irq because we want to trace a particular function that 295 * was called in irq context but we have irq tracing off. Since this 296 * can only be modified by current, we can reuse trace_recursion. 297 */ 298 #define TRACE_IRQ_BIT (1<<13) 299 300 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0) 301 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0) 302 #define trace_recursion_test(bit) ((current)->trace_recursion & (bit)) 303 304 #define TRACE_PIPE_ALL_CPU -1 305 306 int tracer_init(struct tracer *t, struct trace_array *tr); 307 int tracing_is_enabled(void); 308 void trace_wake_up(void); 309 void tracing_reset(struct trace_array *tr, int cpu); 310 void tracing_reset_online_cpus(struct trace_array *tr); 311 void tracing_reset_current(int cpu); 312 void tracing_reset_current_online_cpus(void); 313 int tracing_open_generic(struct inode *inode, struct file *filp); 314 struct dentry *trace_create_file(const char *name, 315 umode_t mode, 316 struct dentry *parent, 317 void *data, 318 const struct file_operations *fops); 319 320 struct dentry *tracing_init_dentry(void); 321 322 struct ring_buffer_event; 323 324 struct ring_buffer_event * 325 trace_buffer_lock_reserve(struct ring_buffer *buffer, 326 int type, 327 unsigned long len, 328 unsigned long flags, 329 int pc); 330 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 331 struct ring_buffer_event *event, 332 unsigned long flags, int pc); 333 334 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 335 struct trace_array_cpu *data); 336 337 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 338 int *ent_cpu, u64 *ent_ts); 339 340 int trace_empty(struct trace_iterator *iter); 341 342 void *trace_find_next_entry_inc(struct trace_iterator *iter); 343 344 void trace_init_global_iter(struct trace_iterator *iter); 345 346 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 347 348 void default_wait_pipe(struct trace_iterator *iter); 349 void poll_wait_pipe(struct trace_iterator *iter); 350 351 void ftrace(struct trace_array *tr, 352 struct trace_array_cpu *data, 353 unsigned long ip, 354 unsigned long parent_ip, 355 unsigned long flags, int pc); 356 void tracing_sched_switch_trace(struct trace_array *tr, 357 struct task_struct *prev, 358 struct task_struct *next, 359 unsigned long flags, int pc); 360 361 void tracing_sched_wakeup_trace(struct trace_array *tr, 362 struct task_struct *wakee, 363 struct task_struct *cur, 364 unsigned long flags, int pc); 365 void trace_function(struct trace_array *tr, 366 unsigned long ip, 367 unsigned long parent_ip, 368 unsigned long flags, int pc); 369 void trace_graph_function(struct trace_array *tr, 370 unsigned long ip, 371 unsigned long parent_ip, 372 unsigned long flags, int pc); 373 void trace_latency_header(struct seq_file *m); 374 void trace_default_header(struct seq_file *m); 375 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 376 int trace_empty(struct trace_iterator *iter); 377 378 void trace_graph_return(struct ftrace_graph_ret *trace); 379 int trace_graph_entry(struct ftrace_graph_ent *trace); 380 void set_graph_array(struct trace_array *tr); 381 382 void tracing_start_cmdline_record(void); 383 void tracing_stop_cmdline_record(void); 384 void tracing_sched_switch_assign_trace(struct trace_array *tr); 385 void tracing_stop_sched_switch_record(void); 386 void tracing_start_sched_switch_record(void); 387 int register_tracer(struct tracer *type); 388 void unregister_tracer(struct tracer *type); 389 int is_tracing_stopped(void); 390 enum trace_file_type { 391 TRACE_FILE_LAT_FMT = 1, 392 TRACE_FILE_ANNOTATE = 2, 393 }; 394 395 extern cpumask_var_t __read_mostly tracing_buffer_mask; 396 397 #define for_each_tracing_cpu(cpu) \ 398 for_each_cpu(cpu, tracing_buffer_mask) 399 400 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 401 402 extern unsigned long tracing_thresh; 403 404 #ifdef CONFIG_TRACER_MAX_TRACE 405 extern unsigned long tracing_max_latency; 406 407 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 408 void update_max_tr_single(struct trace_array *tr, 409 struct task_struct *tsk, int cpu); 410 #endif /* CONFIG_TRACER_MAX_TRACE */ 411 412 #ifdef CONFIG_STACKTRACE 413 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 414 int skip, int pc); 415 416 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 417 int skip, int pc, struct pt_regs *regs); 418 419 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 420 int pc); 421 422 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 423 int pc); 424 #else 425 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 426 unsigned long flags, int skip, int pc) 427 { 428 } 429 430 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 431 unsigned long flags, int skip, 432 int pc, struct pt_regs *regs) 433 { 434 } 435 436 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 437 unsigned long flags, int pc) 438 { 439 } 440 441 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 442 int skip, int pc) 443 { 444 } 445 #endif /* CONFIG_STACKTRACE */ 446 447 extern cycle_t ftrace_now(int cpu); 448 449 extern void trace_find_cmdline(int pid, char comm[]); 450 451 #ifdef CONFIG_DYNAMIC_FTRACE 452 extern unsigned long ftrace_update_tot_cnt; 453 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 454 extern int DYN_FTRACE_TEST_NAME(void); 455 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 456 extern int DYN_FTRACE_TEST_NAME2(void); 457 #endif 458 459 extern int ring_buffer_expanded; 460 extern bool tracing_selftest_disabled; 461 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 462 463 #ifdef CONFIG_FTRACE_STARTUP_TEST 464 extern int trace_selftest_startup_function(struct tracer *trace, 465 struct trace_array *tr); 466 extern int trace_selftest_startup_function_graph(struct tracer *trace, 467 struct trace_array *tr); 468 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 469 struct trace_array *tr); 470 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 471 struct trace_array *tr); 472 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 473 struct trace_array *tr); 474 extern int trace_selftest_startup_wakeup(struct tracer *trace, 475 struct trace_array *tr); 476 extern int trace_selftest_startup_nop(struct tracer *trace, 477 struct trace_array *tr); 478 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 479 struct trace_array *tr); 480 extern int trace_selftest_startup_branch(struct tracer *trace, 481 struct trace_array *tr); 482 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 483 484 extern void *head_page(struct trace_array_cpu *data); 485 extern unsigned long long ns2usecs(cycle_t nsec); 486 extern int 487 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 488 extern int 489 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 490 extern int 491 trace_array_vprintk(struct trace_array *tr, 492 unsigned long ip, const char *fmt, va_list args); 493 int trace_array_printk(struct trace_array *tr, 494 unsigned long ip, const char *fmt, ...); 495 void trace_printk_seq(struct trace_seq *s); 496 enum print_line_t print_trace_line(struct trace_iterator *iter); 497 498 extern unsigned long trace_flags; 499 500 extern int trace_clock_id; 501 502 /* Standard output formatting function used for function return traces */ 503 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 504 505 /* Flag options */ 506 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 507 #define TRACE_GRAPH_PRINT_CPU 0x2 508 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 509 #define TRACE_GRAPH_PRINT_PROC 0x8 510 #define TRACE_GRAPH_PRINT_DURATION 0x10 511 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 512 513 extern enum print_line_t 514 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 515 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 516 extern enum print_line_t 517 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 518 extern void graph_trace_open(struct trace_iterator *iter); 519 extern void graph_trace_close(struct trace_iterator *iter); 520 extern int __trace_graph_entry(struct trace_array *tr, 521 struct ftrace_graph_ent *trace, 522 unsigned long flags, int pc); 523 extern void __trace_graph_return(struct trace_array *tr, 524 struct ftrace_graph_ret *trace, 525 unsigned long flags, int pc); 526 527 528 #ifdef CONFIG_DYNAMIC_FTRACE 529 /* TODO: make this variable */ 530 #define FTRACE_GRAPH_MAX_FUNCS 32 531 extern int ftrace_graph_filter_enabled; 532 extern int ftrace_graph_count; 533 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 534 535 static inline int ftrace_graph_addr(unsigned long addr) 536 { 537 int i; 538 539 if (!ftrace_graph_filter_enabled) 540 return 1; 541 542 for (i = 0; i < ftrace_graph_count; i++) { 543 if (addr == ftrace_graph_funcs[i]) { 544 /* 545 * If no irqs are to be traced, but a set_graph_function 546 * is set, and called by an interrupt handler, we still 547 * want to trace it. 548 */ 549 if (in_irq()) 550 trace_recursion_set(TRACE_IRQ_BIT); 551 else 552 trace_recursion_clear(TRACE_IRQ_BIT); 553 return 1; 554 } 555 } 556 557 return 0; 558 } 559 #else 560 static inline int ftrace_graph_addr(unsigned long addr) 561 { 562 return 1; 563 } 564 #endif /* CONFIG_DYNAMIC_FTRACE */ 565 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 566 static inline enum print_line_t 567 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 568 { 569 return TRACE_TYPE_UNHANDLED; 570 } 571 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 572 573 extern struct list_head ftrace_pids; 574 575 #ifdef CONFIG_FUNCTION_TRACER 576 static inline int ftrace_trace_task(struct task_struct *task) 577 { 578 if (list_empty(&ftrace_pids)) 579 return 1; 580 581 return test_tsk_trace_trace(task); 582 } 583 extern int ftrace_is_dead(void); 584 #else 585 static inline int ftrace_trace_task(struct task_struct *task) 586 { 587 return 1; 588 } 589 static inline int ftrace_is_dead(void) { return 0; } 590 #endif 591 592 /* 593 * struct trace_parser - servers for reading the user input separated by spaces 594 * @cont: set if the input is not complete - no final space char was found 595 * @buffer: holds the parsed user input 596 * @idx: user input length 597 * @size: buffer size 598 */ 599 struct trace_parser { 600 bool cont; 601 char *buffer; 602 unsigned idx; 603 unsigned size; 604 }; 605 606 static inline bool trace_parser_loaded(struct trace_parser *parser) 607 { 608 return (parser->idx != 0); 609 } 610 611 static inline bool trace_parser_cont(struct trace_parser *parser) 612 { 613 return parser->cont; 614 } 615 616 static inline void trace_parser_clear(struct trace_parser *parser) 617 { 618 parser->cont = false; 619 parser->idx = 0; 620 } 621 622 extern int trace_parser_get_init(struct trace_parser *parser, int size); 623 extern void trace_parser_put(struct trace_parser *parser); 624 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 625 size_t cnt, loff_t *ppos); 626 627 /* 628 * trace_iterator_flags is an enumeration that defines bit 629 * positions into trace_flags that controls the output. 630 * 631 * NOTE: These bits must match the trace_options array in 632 * trace.c. 633 */ 634 enum trace_iterator_flags { 635 TRACE_ITER_PRINT_PARENT = 0x01, 636 TRACE_ITER_SYM_OFFSET = 0x02, 637 TRACE_ITER_SYM_ADDR = 0x04, 638 TRACE_ITER_VERBOSE = 0x08, 639 TRACE_ITER_RAW = 0x10, 640 TRACE_ITER_HEX = 0x20, 641 TRACE_ITER_BIN = 0x40, 642 TRACE_ITER_BLOCK = 0x80, 643 TRACE_ITER_STACKTRACE = 0x100, 644 TRACE_ITER_PRINTK = 0x200, 645 TRACE_ITER_PREEMPTONLY = 0x400, 646 TRACE_ITER_BRANCH = 0x800, 647 TRACE_ITER_ANNOTATE = 0x1000, 648 TRACE_ITER_USERSTACKTRACE = 0x2000, 649 TRACE_ITER_SYM_USEROBJ = 0x4000, 650 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 651 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 652 TRACE_ITER_LATENCY_FMT = 0x20000, 653 TRACE_ITER_SLEEP_TIME = 0x40000, 654 TRACE_ITER_GRAPH_TIME = 0x80000, 655 TRACE_ITER_RECORD_CMD = 0x100000, 656 TRACE_ITER_OVERWRITE = 0x200000, 657 TRACE_ITER_STOP_ON_FREE = 0x400000, 658 TRACE_ITER_IRQ_INFO = 0x800000, 659 }; 660 661 /* 662 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 663 * control the output of kernel symbols. 664 */ 665 #define TRACE_ITER_SYM_MASK \ 666 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 667 668 extern struct tracer nop_trace; 669 670 #ifdef CONFIG_BRANCH_TRACER 671 extern int enable_branch_tracing(struct trace_array *tr); 672 extern void disable_branch_tracing(void); 673 static inline int trace_branch_enable(struct trace_array *tr) 674 { 675 if (trace_flags & TRACE_ITER_BRANCH) 676 return enable_branch_tracing(tr); 677 return 0; 678 } 679 static inline void trace_branch_disable(void) 680 { 681 /* due to races, always disable */ 682 disable_branch_tracing(); 683 } 684 #else 685 static inline int trace_branch_enable(struct trace_array *tr) 686 { 687 return 0; 688 } 689 static inline void trace_branch_disable(void) 690 { 691 } 692 #endif /* CONFIG_BRANCH_TRACER */ 693 694 /* set ring buffers to default size if not already done so */ 695 int tracing_update_buffers(void); 696 697 /* trace event type bit fields, not numeric */ 698 enum { 699 TRACE_EVENT_TYPE_PRINTF = 1, 700 TRACE_EVENT_TYPE_RAW = 2, 701 }; 702 703 struct ftrace_event_field { 704 struct list_head link; 705 char *name; 706 char *type; 707 int filter_type; 708 int offset; 709 int size; 710 int is_signed; 711 }; 712 713 struct event_filter { 714 int n_preds; /* Number assigned */ 715 int a_preds; /* allocated */ 716 struct filter_pred *preds; 717 struct filter_pred *root; 718 char *filter_string; 719 }; 720 721 struct event_subsystem { 722 struct list_head list; 723 const char *name; 724 struct dentry *entry; 725 struct event_filter *filter; 726 int nr_events; 727 int ref_count; 728 }; 729 730 #define FILTER_PRED_INVALID ((unsigned short)-1) 731 #define FILTER_PRED_IS_RIGHT (1 << 15) 732 #define FILTER_PRED_FOLD (1 << 15) 733 734 /* 735 * The max preds is the size of unsigned short with 736 * two flags at the MSBs. One bit is used for both the IS_RIGHT 737 * and FOLD flags. The other is reserved. 738 * 739 * 2^14 preds is way more than enough. 740 */ 741 #define MAX_FILTER_PRED 16384 742 743 struct filter_pred; 744 struct regex; 745 746 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 747 748 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 749 750 enum regex_type { 751 MATCH_FULL = 0, 752 MATCH_FRONT_ONLY, 753 MATCH_MIDDLE_ONLY, 754 MATCH_END_ONLY, 755 }; 756 757 struct regex { 758 char pattern[MAX_FILTER_STR_VAL]; 759 int len; 760 int field_len; 761 regex_match_func match; 762 }; 763 764 struct filter_pred { 765 filter_pred_fn_t fn; 766 u64 val; 767 struct regex regex; 768 unsigned short *ops; 769 #ifdef CONFIG_FTRACE_STARTUP_TEST 770 struct ftrace_event_field *field; 771 #endif 772 int offset; 773 int not; 774 int op; 775 unsigned short index; 776 unsigned short parent; 777 unsigned short left; 778 unsigned short right; 779 }; 780 781 extern struct list_head ftrace_common_fields; 782 783 extern enum regex_type 784 filter_parse_regex(char *buff, int len, char **search, int *not); 785 extern void print_event_filter(struct ftrace_event_call *call, 786 struct trace_seq *s); 787 extern int apply_event_filter(struct ftrace_event_call *call, 788 char *filter_string); 789 extern int apply_subsystem_event_filter(struct event_subsystem *system, 790 char *filter_string); 791 extern void print_subsystem_event_filter(struct event_subsystem *system, 792 struct trace_seq *s); 793 extern int filter_assign_type(const char *type); 794 795 struct list_head * 796 trace_get_fields(struct ftrace_event_call *event_call); 797 798 static inline int 799 filter_check_discard(struct ftrace_event_call *call, void *rec, 800 struct ring_buffer *buffer, 801 struct ring_buffer_event *event) 802 { 803 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 804 !filter_match_preds(call->filter, rec)) { 805 ring_buffer_discard_commit(buffer, event); 806 return 1; 807 } 808 809 return 0; 810 } 811 812 extern void trace_event_enable_cmd_record(bool enable); 813 814 extern struct mutex event_mutex; 815 extern struct list_head ftrace_events; 816 817 extern const char *__start___trace_bprintk_fmt[]; 818 extern const char *__stop___trace_bprintk_fmt[]; 819 820 #undef FTRACE_ENTRY 821 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 822 extern struct ftrace_event_call \ 823 __attribute__((__aligned__(4))) event_##call; 824 #undef FTRACE_ENTRY_DUP 825 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 826 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 827 #include "trace_entries.h" 828 829 #endif /* _LINUX_KERNEL_TRACE_H */ 830