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, filter) \ 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, filter) 70 71 #undef FTRACE_ENTRY_REG 72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 73 filter, regfn) \ 74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 75 filter) 76 77 #include "trace_entries.h" 78 79 /* 80 * syscalls are special, and need special handling, this is why 81 * they are not included in trace_entries.h 82 */ 83 struct syscall_trace_enter { 84 struct trace_entry ent; 85 int nr; 86 unsigned long args[]; 87 }; 88 89 struct syscall_trace_exit { 90 struct trace_entry ent; 91 int nr; 92 long ret; 93 }; 94 95 struct kprobe_trace_entry_head { 96 struct trace_entry ent; 97 unsigned long ip; 98 }; 99 100 struct kretprobe_trace_entry_head { 101 struct trace_entry ent; 102 unsigned long func; 103 unsigned long ret_ip; 104 }; 105 106 /* 107 * trace_flag_type is an enumeration that holds different 108 * states when a trace occurs. These are: 109 * IRQS_OFF - interrupts were disabled 110 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 111 * NEED_RESCHED - reschedule is requested 112 * HARDIRQ - inside an interrupt handler 113 * SOFTIRQ - inside a softirq handler 114 */ 115 enum trace_flag_type { 116 TRACE_FLAG_IRQS_OFF = 0x01, 117 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 118 TRACE_FLAG_NEED_RESCHED = 0x04, 119 TRACE_FLAG_HARDIRQ = 0x08, 120 TRACE_FLAG_SOFTIRQ = 0x10, 121 }; 122 123 #define TRACE_BUF_SIZE 1024 124 125 /* 126 * The CPU trace array - it consists of thousands of trace entries 127 * plus some other descriptor data: (for example which task started 128 * the trace, etc.) 129 */ 130 struct trace_array_cpu { 131 atomic_t disabled; 132 void *buffer_page; /* ring buffer spare */ 133 134 unsigned long saved_latency; 135 unsigned long critical_start; 136 unsigned long critical_end; 137 unsigned long critical_sequence; 138 unsigned long nice; 139 unsigned long policy; 140 unsigned long rt_priority; 141 unsigned long skipped_entries; 142 cycle_t preempt_timestamp; 143 pid_t pid; 144 uid_t uid; 145 char comm[TASK_COMM_LEN]; 146 }; 147 148 /* 149 * The trace array - an array of per-CPU trace arrays. This is the 150 * highest level data structure that individual tracers deal with. 151 * They have on/off state as well: 152 */ 153 struct trace_array { 154 struct ring_buffer *buffer; 155 unsigned long entries; 156 int cpu; 157 int buffer_disabled; 158 cycle_t time_start; 159 struct task_struct *waiter; 160 struct trace_array_cpu *data[NR_CPUS]; 161 }; 162 163 #define FTRACE_CMP_TYPE(var, type) \ 164 __builtin_types_compatible_p(typeof(var), type *) 165 166 #undef IF_ASSIGN 167 #define IF_ASSIGN(var, entry, etype, id) \ 168 if (FTRACE_CMP_TYPE(var, etype)) { \ 169 var = (typeof(var))(entry); \ 170 WARN_ON(id && (entry)->type != id); \ 171 break; \ 172 } 173 174 /* Will cause compile errors if type is not found. */ 175 extern void __ftrace_bad_type(void); 176 177 /* 178 * The trace_assign_type is a verifier that the entry type is 179 * the same as the type being assigned. To add new types simply 180 * add a line with the following format: 181 * 182 * IF_ASSIGN(var, ent, type, id); 183 * 184 * Where "type" is the trace type that includes the trace_entry 185 * as the "ent" item. And "id" is the trace identifier that is 186 * used in the trace_type enum. 187 * 188 * If the type can have more than one id, then use zero. 189 */ 190 #define trace_assign_type(var, ent) \ 191 do { \ 192 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 193 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 194 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 195 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 196 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 197 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 198 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 199 TRACE_MMIO_RW); \ 200 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 201 TRACE_MMIO_MAP); \ 202 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 203 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 204 TRACE_GRAPH_ENT); \ 205 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 206 TRACE_GRAPH_RET); \ 207 __ftrace_bad_type(); \ 208 } while (0) 209 210 /* 211 * An option specific to a tracer. This is a boolean value. 212 * The bit is the bit index that sets its value on the 213 * flags value in struct tracer_flags. 214 */ 215 struct tracer_opt { 216 const char *name; /* Will appear on the trace_options file */ 217 u32 bit; /* Mask assigned in val field in tracer_flags */ 218 }; 219 220 /* 221 * The set of specific options for a tracer. Your tracer 222 * have to set the initial value of the flags val. 223 */ 224 struct tracer_flags { 225 u32 val; 226 struct tracer_opt *opts; 227 }; 228 229 /* Makes more easy to define a tracer opt */ 230 #define TRACER_OPT(s, b) .name = #s, .bit = b 231 232 233 /** 234 * struct tracer - a specific tracer and its callbacks to interact with debugfs 235 * @name: the name chosen to select it on the available_tracers file 236 * @init: called when one switches to this tracer (echo name > current_tracer) 237 * @reset: called when one switches to another tracer 238 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 239 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 240 * @open: called when the trace file is opened 241 * @pipe_open: called when the trace_pipe file is opened 242 * @wait_pipe: override how the user waits for traces on trace_pipe 243 * @close: called when the trace file is released 244 * @pipe_close: called when the trace_pipe file is released 245 * @read: override the default read callback on trace_pipe 246 * @splice_read: override the default splice_read callback on trace_pipe 247 * @selftest: selftest to run on boot (see trace_selftest.c) 248 * @print_headers: override the first lines that describe your columns 249 * @print_line: callback that prints a trace 250 * @set_flag: signals one of your private flags changed (trace_options file) 251 * @flags: your private flags 252 */ 253 struct tracer { 254 const char *name; 255 int (*init)(struct trace_array *tr); 256 void (*reset)(struct trace_array *tr); 257 void (*start)(struct trace_array *tr); 258 void (*stop)(struct trace_array *tr); 259 void (*open)(struct trace_iterator *iter); 260 void (*pipe_open)(struct trace_iterator *iter); 261 void (*wait_pipe)(struct trace_iterator *iter); 262 void (*close)(struct trace_iterator *iter); 263 void (*pipe_close)(struct trace_iterator *iter); 264 ssize_t (*read)(struct trace_iterator *iter, 265 struct file *filp, char __user *ubuf, 266 size_t cnt, loff_t *ppos); 267 ssize_t (*splice_read)(struct trace_iterator *iter, 268 struct file *filp, 269 loff_t *ppos, 270 struct pipe_inode_info *pipe, 271 size_t len, 272 unsigned int flags); 273 #ifdef CONFIG_FTRACE_STARTUP_TEST 274 int (*selftest)(struct tracer *trace, 275 struct trace_array *tr); 276 #endif 277 void (*print_header)(struct seq_file *m); 278 enum print_line_t (*print_line)(struct trace_iterator *iter); 279 /* If you handled the flag setting, return 0 */ 280 int (*set_flag)(u32 old_flags, u32 bit, int set); 281 struct tracer *next; 282 struct tracer_flags *flags; 283 int print_max; 284 int use_max_tr; 285 }; 286 287 288 /* Only current can touch trace_recursion */ 289 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0) 290 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0) 291 292 /* Ring buffer has the 10 LSB bits to count */ 293 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff) 294 295 /* for function tracing recursion */ 296 #define TRACE_INTERNAL_BIT (1<<11) 297 #define TRACE_GLOBAL_BIT (1<<12) 298 #define TRACE_CONTROL_BIT (1<<13) 299 300 /* 301 * Abuse of the trace_recursion. 302 * As we need a way to maintain state if we are tracing the function 303 * graph in irq because we want to trace a particular function that 304 * was called in irq context but we have irq tracing off. Since this 305 * can only be modified by current, we can reuse trace_recursion. 306 */ 307 #define TRACE_IRQ_BIT (1<<13) 308 309 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0) 310 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0) 311 #define trace_recursion_test(bit) ((current)->trace_recursion & (bit)) 312 313 #define TRACE_PIPE_ALL_CPU -1 314 315 int tracer_init(struct tracer *t, struct trace_array *tr); 316 int tracing_is_enabled(void); 317 void trace_wake_up(void); 318 void tracing_reset(struct trace_array *tr, int cpu); 319 void tracing_reset_online_cpus(struct trace_array *tr); 320 void tracing_reset_current(int cpu); 321 void tracing_reset_current_online_cpus(void); 322 int tracing_open_generic(struct inode *inode, struct file *filp); 323 struct dentry *trace_create_file(const char *name, 324 umode_t mode, 325 struct dentry *parent, 326 void *data, 327 const struct file_operations *fops); 328 329 struct dentry *tracing_init_dentry(void); 330 331 struct ring_buffer_event; 332 333 struct ring_buffer_event * 334 trace_buffer_lock_reserve(struct ring_buffer *buffer, 335 int type, 336 unsigned long len, 337 unsigned long flags, 338 int pc); 339 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 340 struct ring_buffer_event *event, 341 unsigned long flags, int pc); 342 343 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 344 struct trace_array_cpu *data); 345 346 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 347 int *ent_cpu, u64 *ent_ts); 348 349 int trace_empty(struct trace_iterator *iter); 350 351 void *trace_find_next_entry_inc(struct trace_iterator *iter); 352 353 void trace_init_global_iter(struct trace_iterator *iter); 354 355 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 356 357 void default_wait_pipe(struct trace_iterator *iter); 358 void poll_wait_pipe(struct trace_iterator *iter); 359 360 void ftrace(struct trace_array *tr, 361 struct trace_array_cpu *data, 362 unsigned long ip, 363 unsigned long parent_ip, 364 unsigned long flags, int pc); 365 void tracing_sched_switch_trace(struct trace_array *tr, 366 struct task_struct *prev, 367 struct task_struct *next, 368 unsigned long flags, int pc); 369 370 void tracing_sched_wakeup_trace(struct trace_array *tr, 371 struct task_struct *wakee, 372 struct task_struct *cur, 373 unsigned long flags, int pc); 374 void trace_function(struct trace_array *tr, 375 unsigned long ip, 376 unsigned long parent_ip, 377 unsigned long flags, int pc); 378 void trace_graph_function(struct trace_array *tr, 379 unsigned long ip, 380 unsigned long parent_ip, 381 unsigned long flags, int pc); 382 void trace_latency_header(struct seq_file *m); 383 void trace_default_header(struct seq_file *m); 384 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 385 int trace_empty(struct trace_iterator *iter); 386 387 void trace_graph_return(struct ftrace_graph_ret *trace); 388 int trace_graph_entry(struct ftrace_graph_ent *trace); 389 void set_graph_array(struct trace_array *tr); 390 391 void tracing_start_cmdline_record(void); 392 void tracing_stop_cmdline_record(void); 393 void tracing_sched_switch_assign_trace(struct trace_array *tr); 394 void tracing_stop_sched_switch_record(void); 395 void tracing_start_sched_switch_record(void); 396 int register_tracer(struct tracer *type); 397 void unregister_tracer(struct tracer *type); 398 int is_tracing_stopped(void); 399 enum trace_file_type { 400 TRACE_FILE_LAT_FMT = 1, 401 TRACE_FILE_ANNOTATE = 2, 402 }; 403 404 extern cpumask_var_t __read_mostly tracing_buffer_mask; 405 406 #define for_each_tracing_cpu(cpu) \ 407 for_each_cpu(cpu, tracing_buffer_mask) 408 409 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 410 411 extern unsigned long tracing_thresh; 412 413 #ifdef CONFIG_TRACER_MAX_TRACE 414 extern unsigned long tracing_max_latency; 415 416 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 417 void update_max_tr_single(struct trace_array *tr, 418 struct task_struct *tsk, int cpu); 419 #endif /* CONFIG_TRACER_MAX_TRACE */ 420 421 #ifdef CONFIG_STACKTRACE 422 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 423 int skip, int pc); 424 425 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 426 int skip, int pc, struct pt_regs *regs); 427 428 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 429 int pc); 430 431 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 432 int pc); 433 #else 434 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 435 unsigned long flags, int skip, int pc) 436 { 437 } 438 439 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 440 unsigned long flags, int skip, 441 int pc, struct pt_regs *regs) 442 { 443 } 444 445 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 446 unsigned long flags, int pc) 447 { 448 } 449 450 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 451 int skip, int pc) 452 { 453 } 454 #endif /* CONFIG_STACKTRACE */ 455 456 extern cycle_t ftrace_now(int cpu); 457 458 extern void trace_find_cmdline(int pid, char comm[]); 459 460 #ifdef CONFIG_DYNAMIC_FTRACE 461 extern unsigned long ftrace_update_tot_cnt; 462 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 463 extern int DYN_FTRACE_TEST_NAME(void); 464 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 465 extern int DYN_FTRACE_TEST_NAME2(void); 466 #endif 467 468 extern int ring_buffer_expanded; 469 extern bool tracing_selftest_disabled; 470 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 471 472 #ifdef CONFIG_FTRACE_STARTUP_TEST 473 extern int trace_selftest_startup_function(struct tracer *trace, 474 struct trace_array *tr); 475 extern int trace_selftest_startup_function_graph(struct tracer *trace, 476 struct trace_array *tr); 477 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 478 struct trace_array *tr); 479 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 480 struct trace_array *tr); 481 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 482 struct trace_array *tr); 483 extern int trace_selftest_startup_wakeup(struct tracer *trace, 484 struct trace_array *tr); 485 extern int trace_selftest_startup_nop(struct tracer *trace, 486 struct trace_array *tr); 487 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 488 struct trace_array *tr); 489 extern int trace_selftest_startup_branch(struct tracer *trace, 490 struct trace_array *tr); 491 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 492 493 extern void *head_page(struct trace_array_cpu *data); 494 extern unsigned long long ns2usecs(cycle_t nsec); 495 extern int 496 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 497 extern int 498 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 499 extern int 500 trace_array_vprintk(struct trace_array *tr, 501 unsigned long ip, const char *fmt, va_list args); 502 int trace_array_printk(struct trace_array *tr, 503 unsigned long ip, const char *fmt, ...); 504 void trace_printk_seq(struct trace_seq *s); 505 enum print_line_t print_trace_line(struct trace_iterator *iter); 506 507 extern unsigned long trace_flags; 508 509 extern int trace_clock_id; 510 511 /* Standard output formatting function used for function return traces */ 512 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 513 514 /* Flag options */ 515 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 516 #define TRACE_GRAPH_PRINT_CPU 0x2 517 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 518 #define TRACE_GRAPH_PRINT_PROC 0x8 519 #define TRACE_GRAPH_PRINT_DURATION 0x10 520 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 521 522 extern enum print_line_t 523 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 524 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 525 extern enum print_line_t 526 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 527 extern void graph_trace_open(struct trace_iterator *iter); 528 extern void graph_trace_close(struct trace_iterator *iter); 529 extern int __trace_graph_entry(struct trace_array *tr, 530 struct ftrace_graph_ent *trace, 531 unsigned long flags, int pc); 532 extern void __trace_graph_return(struct trace_array *tr, 533 struct ftrace_graph_ret *trace, 534 unsigned long flags, int pc); 535 536 537 #ifdef CONFIG_DYNAMIC_FTRACE 538 /* TODO: make this variable */ 539 #define FTRACE_GRAPH_MAX_FUNCS 32 540 extern int ftrace_graph_filter_enabled; 541 extern int ftrace_graph_count; 542 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 543 544 static inline int ftrace_graph_addr(unsigned long addr) 545 { 546 int i; 547 548 if (!ftrace_graph_filter_enabled) 549 return 1; 550 551 for (i = 0; i < ftrace_graph_count; i++) { 552 if (addr == ftrace_graph_funcs[i]) { 553 /* 554 * If no irqs are to be traced, but a set_graph_function 555 * is set, and called by an interrupt handler, we still 556 * want to trace it. 557 */ 558 if (in_irq()) 559 trace_recursion_set(TRACE_IRQ_BIT); 560 else 561 trace_recursion_clear(TRACE_IRQ_BIT); 562 return 1; 563 } 564 } 565 566 return 0; 567 } 568 #else 569 static inline int ftrace_graph_addr(unsigned long addr) 570 { 571 return 1; 572 } 573 #endif /* CONFIG_DYNAMIC_FTRACE */ 574 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 575 static inline enum print_line_t 576 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 577 { 578 return TRACE_TYPE_UNHANDLED; 579 } 580 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 581 582 extern struct list_head ftrace_pids; 583 584 #ifdef CONFIG_FUNCTION_TRACER 585 static inline int ftrace_trace_task(struct task_struct *task) 586 { 587 if (list_empty(&ftrace_pids)) 588 return 1; 589 590 return test_tsk_trace_trace(task); 591 } 592 extern int ftrace_is_dead(void); 593 #else 594 static inline int ftrace_trace_task(struct task_struct *task) 595 { 596 return 1; 597 } 598 static inline int ftrace_is_dead(void) { return 0; } 599 #endif 600 601 int ftrace_event_is_function(struct ftrace_event_call *call); 602 603 /* 604 * struct trace_parser - servers for reading the user input separated by spaces 605 * @cont: set if the input is not complete - no final space char was found 606 * @buffer: holds the parsed user input 607 * @idx: user input length 608 * @size: buffer size 609 */ 610 struct trace_parser { 611 bool cont; 612 char *buffer; 613 unsigned idx; 614 unsigned size; 615 }; 616 617 static inline bool trace_parser_loaded(struct trace_parser *parser) 618 { 619 return (parser->idx != 0); 620 } 621 622 static inline bool trace_parser_cont(struct trace_parser *parser) 623 { 624 return parser->cont; 625 } 626 627 static inline void trace_parser_clear(struct trace_parser *parser) 628 { 629 parser->cont = false; 630 parser->idx = 0; 631 } 632 633 extern int trace_parser_get_init(struct trace_parser *parser, int size); 634 extern void trace_parser_put(struct trace_parser *parser); 635 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 636 size_t cnt, loff_t *ppos); 637 638 /* 639 * trace_iterator_flags is an enumeration that defines bit 640 * positions into trace_flags that controls the output. 641 * 642 * NOTE: These bits must match the trace_options array in 643 * trace.c. 644 */ 645 enum trace_iterator_flags { 646 TRACE_ITER_PRINT_PARENT = 0x01, 647 TRACE_ITER_SYM_OFFSET = 0x02, 648 TRACE_ITER_SYM_ADDR = 0x04, 649 TRACE_ITER_VERBOSE = 0x08, 650 TRACE_ITER_RAW = 0x10, 651 TRACE_ITER_HEX = 0x20, 652 TRACE_ITER_BIN = 0x40, 653 TRACE_ITER_BLOCK = 0x80, 654 TRACE_ITER_STACKTRACE = 0x100, 655 TRACE_ITER_PRINTK = 0x200, 656 TRACE_ITER_PREEMPTONLY = 0x400, 657 TRACE_ITER_BRANCH = 0x800, 658 TRACE_ITER_ANNOTATE = 0x1000, 659 TRACE_ITER_USERSTACKTRACE = 0x2000, 660 TRACE_ITER_SYM_USEROBJ = 0x4000, 661 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 662 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 663 TRACE_ITER_LATENCY_FMT = 0x20000, 664 TRACE_ITER_SLEEP_TIME = 0x40000, 665 TRACE_ITER_GRAPH_TIME = 0x80000, 666 TRACE_ITER_RECORD_CMD = 0x100000, 667 TRACE_ITER_OVERWRITE = 0x200000, 668 TRACE_ITER_STOP_ON_FREE = 0x400000, 669 TRACE_ITER_IRQ_INFO = 0x800000, 670 }; 671 672 /* 673 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 674 * control the output of kernel symbols. 675 */ 676 #define TRACE_ITER_SYM_MASK \ 677 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 678 679 extern struct tracer nop_trace; 680 681 #ifdef CONFIG_BRANCH_TRACER 682 extern int enable_branch_tracing(struct trace_array *tr); 683 extern void disable_branch_tracing(void); 684 static inline int trace_branch_enable(struct trace_array *tr) 685 { 686 if (trace_flags & TRACE_ITER_BRANCH) 687 return enable_branch_tracing(tr); 688 return 0; 689 } 690 static inline void trace_branch_disable(void) 691 { 692 /* due to races, always disable */ 693 disable_branch_tracing(); 694 } 695 #else 696 static inline int trace_branch_enable(struct trace_array *tr) 697 { 698 return 0; 699 } 700 static inline void trace_branch_disable(void) 701 { 702 } 703 #endif /* CONFIG_BRANCH_TRACER */ 704 705 /* set ring buffers to default size if not already done so */ 706 int tracing_update_buffers(void); 707 708 /* trace event type bit fields, not numeric */ 709 enum { 710 TRACE_EVENT_TYPE_PRINTF = 1, 711 TRACE_EVENT_TYPE_RAW = 2, 712 }; 713 714 struct ftrace_event_field { 715 struct list_head link; 716 char *name; 717 char *type; 718 int filter_type; 719 int offset; 720 int size; 721 int is_signed; 722 }; 723 724 struct event_filter { 725 int n_preds; /* Number assigned */ 726 int a_preds; /* allocated */ 727 struct filter_pred *preds; 728 struct filter_pred *root; 729 char *filter_string; 730 }; 731 732 struct event_subsystem { 733 struct list_head list; 734 const char *name; 735 struct dentry *entry; 736 struct event_filter *filter; 737 int nr_events; 738 int ref_count; 739 }; 740 741 #define FILTER_PRED_INVALID ((unsigned short)-1) 742 #define FILTER_PRED_IS_RIGHT (1 << 15) 743 #define FILTER_PRED_FOLD (1 << 15) 744 745 /* 746 * The max preds is the size of unsigned short with 747 * two flags at the MSBs. One bit is used for both the IS_RIGHT 748 * and FOLD flags. The other is reserved. 749 * 750 * 2^14 preds is way more than enough. 751 */ 752 #define MAX_FILTER_PRED 16384 753 754 struct filter_pred; 755 struct regex; 756 757 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 758 759 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 760 761 enum regex_type { 762 MATCH_FULL = 0, 763 MATCH_FRONT_ONLY, 764 MATCH_MIDDLE_ONLY, 765 MATCH_END_ONLY, 766 }; 767 768 struct regex { 769 char pattern[MAX_FILTER_STR_VAL]; 770 int len; 771 int field_len; 772 regex_match_func match; 773 }; 774 775 struct filter_pred { 776 filter_pred_fn_t fn; 777 u64 val; 778 struct regex regex; 779 unsigned short *ops; 780 struct ftrace_event_field *field; 781 int offset; 782 int not; 783 int op; 784 unsigned short index; 785 unsigned short parent; 786 unsigned short left; 787 unsigned short right; 788 }; 789 790 extern struct list_head ftrace_common_fields; 791 792 extern enum regex_type 793 filter_parse_regex(char *buff, int len, char **search, int *not); 794 extern void print_event_filter(struct ftrace_event_call *call, 795 struct trace_seq *s); 796 extern int apply_event_filter(struct ftrace_event_call *call, 797 char *filter_string); 798 extern int apply_subsystem_event_filter(struct event_subsystem *system, 799 char *filter_string); 800 extern void print_subsystem_event_filter(struct event_subsystem *system, 801 struct trace_seq *s); 802 extern int filter_assign_type(const char *type); 803 804 struct list_head * 805 trace_get_fields(struct ftrace_event_call *event_call); 806 807 static inline int 808 filter_check_discard(struct ftrace_event_call *call, void *rec, 809 struct ring_buffer *buffer, 810 struct ring_buffer_event *event) 811 { 812 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 813 !filter_match_preds(call->filter, rec)) { 814 ring_buffer_discard_commit(buffer, event); 815 return 1; 816 } 817 818 return 0; 819 } 820 821 extern void trace_event_enable_cmd_record(bool enable); 822 823 extern struct mutex event_mutex; 824 extern struct list_head ftrace_events; 825 826 extern const char *__start___trace_bprintk_fmt[]; 827 extern const char *__stop___trace_bprintk_fmt[]; 828 829 #undef FTRACE_ENTRY 830 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 831 extern struct ftrace_event_call \ 832 __attribute__((__aligned__(4))) event_##call; 833 #undef FTRACE_ENTRY_DUP 834 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 835 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 836 filter) 837 #include "trace_entries.h" 838 839 #ifdef CONFIG_FUNCTION_TRACER 840 int perf_ftrace_event_register(struct ftrace_event_call *call, 841 enum trace_reg type, void *data); 842 #else 843 #define perf_ftrace_event_register NULL 844 #endif /* CONFIG_FUNCTION_TRACER */ 845 846 #endif /* _LINUX_KERNEL_TRACE_H */ 847