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