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 cycle_t time_start; 158 struct task_struct *waiter; 159 struct trace_array_cpu *data[NR_CPUS]; 160 }; 161 162 #define FTRACE_CMP_TYPE(var, type) \ 163 __builtin_types_compatible_p(typeof(var), type *) 164 165 #undef IF_ASSIGN 166 #define IF_ASSIGN(var, entry, etype, id) \ 167 if (FTRACE_CMP_TYPE(var, etype)) { \ 168 var = (typeof(var))(entry); \ 169 WARN_ON(id && (entry)->type != id); \ 170 break; \ 171 } 172 173 /* Will cause compile errors if type is not found. */ 174 extern void __ftrace_bad_type(void); 175 176 /* 177 * The trace_assign_type is a verifier that the entry type is 178 * the same as the type being assigned. To add new types simply 179 * add a line with the following format: 180 * 181 * IF_ASSIGN(var, ent, type, id); 182 * 183 * Where "type" is the trace type that includes the trace_entry 184 * as the "ent" item. And "id" is the trace identifier that is 185 * used in the trace_type enum. 186 * 187 * If the type can have more than one id, then use zero. 188 */ 189 #define trace_assign_type(var, ent) \ 190 do { \ 191 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 192 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 193 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 194 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 195 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 196 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 197 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 198 TRACE_MMIO_RW); \ 199 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 200 TRACE_MMIO_MAP); \ 201 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 202 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 203 TRACE_GRAPH_ENT); \ 204 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 205 TRACE_GRAPH_RET); \ 206 __ftrace_bad_type(); \ 207 } while (0) 208 209 /* 210 * An option specific to a tracer. This is a boolean value. 211 * The bit is the bit index that sets its value on the 212 * flags value in struct tracer_flags. 213 */ 214 struct tracer_opt { 215 const char *name; /* Will appear on the trace_options file */ 216 u32 bit; /* Mask assigned in val field in tracer_flags */ 217 }; 218 219 /* 220 * The set of specific options for a tracer. Your tracer 221 * have to set the initial value of the flags val. 222 */ 223 struct tracer_flags { 224 u32 val; 225 struct tracer_opt *opts; 226 }; 227 228 /* Makes more easy to define a tracer opt */ 229 #define TRACER_OPT(s, b) .name = #s, .bit = b 230 231 232 /** 233 * struct tracer - a specific tracer and its callbacks to interact with debugfs 234 * @name: the name chosen to select it on the available_tracers file 235 * @init: called when one switches to this tracer (echo name > current_tracer) 236 * @reset: called when one switches to another tracer 237 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 238 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 239 * @open: called when the trace file is opened 240 * @pipe_open: called when the trace_pipe file is opened 241 * @wait_pipe: override how the user waits for traces on trace_pipe 242 * @close: called when the trace file is released 243 * @pipe_close: called when the trace_pipe file is released 244 * @read: override the default read callback on trace_pipe 245 * @splice_read: override the default splice_read callback on trace_pipe 246 * @selftest: selftest to run on boot (see trace_selftest.c) 247 * @print_headers: override the first lines that describe your columns 248 * @print_line: callback that prints a trace 249 * @set_flag: signals one of your private flags changed (trace_options file) 250 * @flags: your private flags 251 */ 252 struct tracer { 253 const char *name; 254 int (*init)(struct trace_array *tr); 255 void (*reset)(struct trace_array *tr); 256 void (*start)(struct trace_array *tr); 257 void (*stop)(struct trace_array *tr); 258 void (*open)(struct trace_iterator *iter); 259 void (*pipe_open)(struct trace_iterator *iter); 260 void (*wait_pipe)(struct trace_iterator *iter); 261 void (*close)(struct trace_iterator *iter); 262 void (*pipe_close)(struct trace_iterator *iter); 263 ssize_t (*read)(struct trace_iterator *iter, 264 struct file *filp, char __user *ubuf, 265 size_t cnt, loff_t *ppos); 266 ssize_t (*splice_read)(struct trace_iterator *iter, 267 struct file *filp, 268 loff_t *ppos, 269 struct pipe_inode_info *pipe, 270 size_t len, 271 unsigned int flags); 272 #ifdef CONFIG_FTRACE_STARTUP_TEST 273 int (*selftest)(struct tracer *trace, 274 struct trace_array *tr); 275 #endif 276 void (*print_header)(struct seq_file *m); 277 enum print_line_t (*print_line)(struct trace_iterator *iter); 278 /* If you handled the flag setting, return 0 */ 279 int (*set_flag)(u32 old_flags, u32 bit, int set); 280 struct tracer *next; 281 struct tracer_flags *flags; 282 int print_max; 283 int use_max_tr; 284 }; 285 286 287 /* Only current can touch trace_recursion */ 288 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0) 289 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0) 290 291 /* Ring buffer has the 10 LSB bits to count */ 292 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff) 293 294 /* for function tracing recursion */ 295 #define TRACE_INTERNAL_BIT (1<<11) 296 #define TRACE_GLOBAL_BIT (1<<12) 297 #define TRACE_CONTROL_BIT (1<<13) 298 299 /* 300 * Abuse of the trace_recursion. 301 * As we need a way to maintain state if we are tracing the function 302 * graph in irq because we want to trace a particular function that 303 * was called in irq context but we have irq tracing off. Since this 304 * can only be modified by current, we can reuse trace_recursion. 305 */ 306 #define TRACE_IRQ_BIT (1<<13) 307 308 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0) 309 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0) 310 #define trace_recursion_test(bit) ((current)->trace_recursion & (bit)) 311 312 #define TRACE_PIPE_ALL_CPU -1 313 314 int tracer_init(struct tracer *t, struct trace_array *tr); 315 int tracing_is_enabled(void); 316 void trace_wake_up(void); 317 void tracing_reset(struct trace_array *tr, int cpu); 318 void tracing_reset_online_cpus(struct trace_array *tr); 319 void tracing_reset_current(int cpu); 320 void tracing_reset_current_online_cpus(void); 321 int tracing_open_generic(struct inode *inode, struct file *filp); 322 struct dentry *trace_create_file(const char *name, 323 umode_t mode, 324 struct dentry *parent, 325 void *data, 326 const struct file_operations *fops); 327 328 struct dentry *tracing_init_dentry(void); 329 330 struct ring_buffer_event; 331 332 struct ring_buffer_event * 333 trace_buffer_lock_reserve(struct ring_buffer *buffer, 334 int type, 335 unsigned long len, 336 unsigned long flags, 337 int pc); 338 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 339 struct ring_buffer_event *event, 340 unsigned long flags, int pc); 341 342 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 343 struct trace_array_cpu *data); 344 345 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 346 int *ent_cpu, u64 *ent_ts); 347 348 int trace_empty(struct trace_iterator *iter); 349 350 void *trace_find_next_entry_inc(struct trace_iterator *iter); 351 352 void trace_init_global_iter(struct trace_iterator *iter); 353 354 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 355 356 void default_wait_pipe(struct trace_iterator *iter); 357 void poll_wait_pipe(struct trace_iterator *iter); 358 359 void ftrace(struct trace_array *tr, 360 struct trace_array_cpu *data, 361 unsigned long ip, 362 unsigned long parent_ip, 363 unsigned long flags, int pc); 364 void tracing_sched_switch_trace(struct trace_array *tr, 365 struct task_struct *prev, 366 struct task_struct *next, 367 unsigned long flags, int pc); 368 369 void tracing_sched_wakeup_trace(struct trace_array *tr, 370 struct task_struct *wakee, 371 struct task_struct *cur, 372 unsigned long flags, int pc); 373 void trace_function(struct trace_array *tr, 374 unsigned long ip, 375 unsigned long parent_ip, 376 unsigned long flags, int pc); 377 void trace_graph_function(struct trace_array *tr, 378 unsigned long ip, 379 unsigned long parent_ip, 380 unsigned long flags, int pc); 381 void trace_latency_header(struct seq_file *m); 382 void trace_default_header(struct seq_file *m); 383 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 384 int trace_empty(struct trace_iterator *iter); 385 386 void trace_graph_return(struct ftrace_graph_ret *trace); 387 int trace_graph_entry(struct ftrace_graph_ent *trace); 388 void set_graph_array(struct trace_array *tr); 389 390 void tracing_start_cmdline_record(void); 391 void tracing_stop_cmdline_record(void); 392 void tracing_sched_switch_assign_trace(struct trace_array *tr); 393 void tracing_stop_sched_switch_record(void); 394 void tracing_start_sched_switch_record(void); 395 int register_tracer(struct tracer *type); 396 void unregister_tracer(struct tracer *type); 397 int is_tracing_stopped(void); 398 enum trace_file_type { 399 TRACE_FILE_LAT_FMT = 1, 400 TRACE_FILE_ANNOTATE = 2, 401 }; 402 403 extern cpumask_var_t __read_mostly tracing_buffer_mask; 404 405 #define for_each_tracing_cpu(cpu) \ 406 for_each_cpu(cpu, tracing_buffer_mask) 407 408 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 409 410 extern unsigned long tracing_thresh; 411 412 #ifdef CONFIG_TRACER_MAX_TRACE 413 extern unsigned long tracing_max_latency; 414 415 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 416 void update_max_tr_single(struct trace_array *tr, 417 struct task_struct *tsk, int cpu); 418 #endif /* CONFIG_TRACER_MAX_TRACE */ 419 420 #ifdef CONFIG_STACKTRACE 421 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 422 int skip, int pc); 423 424 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 425 int skip, int pc, struct pt_regs *regs); 426 427 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 428 int pc); 429 430 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 431 int pc); 432 #else 433 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 434 unsigned long flags, int skip, int pc) 435 { 436 } 437 438 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 439 unsigned long flags, int skip, 440 int pc, struct pt_regs *regs) 441 { 442 } 443 444 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 445 unsigned long flags, int pc) 446 { 447 } 448 449 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 450 int skip, int pc) 451 { 452 } 453 #endif /* CONFIG_STACKTRACE */ 454 455 extern cycle_t ftrace_now(int cpu); 456 457 extern void trace_find_cmdline(int pid, char comm[]); 458 459 #ifdef CONFIG_DYNAMIC_FTRACE 460 extern unsigned long ftrace_update_tot_cnt; 461 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 462 extern int DYN_FTRACE_TEST_NAME(void); 463 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 464 extern int DYN_FTRACE_TEST_NAME2(void); 465 #endif 466 467 extern int ring_buffer_expanded; 468 extern bool tracing_selftest_disabled; 469 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 470 471 #ifdef CONFIG_FTRACE_STARTUP_TEST 472 extern int trace_selftest_startup_function(struct tracer *trace, 473 struct trace_array *tr); 474 extern int trace_selftest_startup_function_graph(struct tracer *trace, 475 struct trace_array *tr); 476 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 477 struct trace_array *tr); 478 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 479 struct trace_array *tr); 480 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 481 struct trace_array *tr); 482 extern int trace_selftest_startup_wakeup(struct tracer *trace, 483 struct trace_array *tr); 484 extern int trace_selftest_startup_nop(struct tracer *trace, 485 struct trace_array *tr); 486 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 487 struct trace_array *tr); 488 extern int trace_selftest_startup_branch(struct tracer *trace, 489 struct trace_array *tr); 490 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 491 492 extern void *head_page(struct trace_array_cpu *data); 493 extern unsigned long long ns2usecs(cycle_t nsec); 494 extern int 495 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 496 extern int 497 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 498 extern int 499 trace_array_vprintk(struct trace_array *tr, 500 unsigned long ip, const char *fmt, va_list args); 501 int trace_array_printk(struct trace_array *tr, 502 unsigned long ip, const char *fmt, ...); 503 void trace_printk_seq(struct trace_seq *s); 504 enum print_line_t print_trace_line(struct trace_iterator *iter); 505 506 extern unsigned long trace_flags; 507 508 extern int trace_clock_id; 509 510 /* Standard output formatting function used for function return traces */ 511 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 512 513 /* Flag options */ 514 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 515 #define TRACE_GRAPH_PRINT_CPU 0x2 516 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 517 #define TRACE_GRAPH_PRINT_PROC 0x8 518 #define TRACE_GRAPH_PRINT_DURATION 0x10 519 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 520 521 extern enum print_line_t 522 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 523 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 524 extern enum print_line_t 525 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 526 extern void graph_trace_open(struct trace_iterator *iter); 527 extern void graph_trace_close(struct trace_iterator *iter); 528 extern int __trace_graph_entry(struct trace_array *tr, 529 struct ftrace_graph_ent *trace, 530 unsigned long flags, int pc); 531 extern void __trace_graph_return(struct trace_array *tr, 532 struct ftrace_graph_ret *trace, 533 unsigned long flags, int pc); 534 535 536 #ifdef CONFIG_DYNAMIC_FTRACE 537 /* TODO: make this variable */ 538 #define FTRACE_GRAPH_MAX_FUNCS 32 539 extern int ftrace_graph_filter_enabled; 540 extern int ftrace_graph_count; 541 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 542 543 static inline int ftrace_graph_addr(unsigned long addr) 544 { 545 int i; 546 547 if (!ftrace_graph_filter_enabled) 548 return 1; 549 550 for (i = 0; i < ftrace_graph_count; i++) { 551 if (addr == ftrace_graph_funcs[i]) { 552 /* 553 * If no irqs are to be traced, but a set_graph_function 554 * is set, and called by an interrupt handler, we still 555 * want to trace it. 556 */ 557 if (in_irq()) 558 trace_recursion_set(TRACE_IRQ_BIT); 559 else 560 trace_recursion_clear(TRACE_IRQ_BIT); 561 return 1; 562 } 563 } 564 565 return 0; 566 } 567 #else 568 static inline int ftrace_graph_addr(unsigned long addr) 569 { 570 return 1; 571 } 572 #endif /* CONFIG_DYNAMIC_FTRACE */ 573 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 574 static inline enum print_line_t 575 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 576 { 577 return TRACE_TYPE_UNHANDLED; 578 } 579 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 580 581 extern struct list_head ftrace_pids; 582 583 #ifdef CONFIG_FUNCTION_TRACER 584 static inline int ftrace_trace_task(struct task_struct *task) 585 { 586 if (list_empty(&ftrace_pids)) 587 return 1; 588 589 return test_tsk_trace_trace(task); 590 } 591 extern int ftrace_is_dead(void); 592 #else 593 static inline int ftrace_trace_task(struct task_struct *task) 594 { 595 return 1; 596 } 597 static inline int ftrace_is_dead(void) { return 0; } 598 #endif 599 600 int ftrace_event_is_function(struct ftrace_event_call *call); 601 602 /* 603 * struct trace_parser - servers for reading the user input separated by spaces 604 * @cont: set if the input is not complete - no final space char was found 605 * @buffer: holds the parsed user input 606 * @idx: user input length 607 * @size: buffer size 608 */ 609 struct trace_parser { 610 bool cont; 611 char *buffer; 612 unsigned idx; 613 unsigned size; 614 }; 615 616 static inline bool trace_parser_loaded(struct trace_parser *parser) 617 { 618 return (parser->idx != 0); 619 } 620 621 static inline bool trace_parser_cont(struct trace_parser *parser) 622 { 623 return parser->cont; 624 } 625 626 static inline void trace_parser_clear(struct trace_parser *parser) 627 { 628 parser->cont = false; 629 parser->idx = 0; 630 } 631 632 extern int trace_parser_get_init(struct trace_parser *parser, int size); 633 extern void trace_parser_put(struct trace_parser *parser); 634 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 635 size_t cnt, loff_t *ppos); 636 637 /* 638 * trace_iterator_flags is an enumeration that defines bit 639 * positions into trace_flags that controls the output. 640 * 641 * NOTE: These bits must match the trace_options array in 642 * trace.c. 643 */ 644 enum trace_iterator_flags { 645 TRACE_ITER_PRINT_PARENT = 0x01, 646 TRACE_ITER_SYM_OFFSET = 0x02, 647 TRACE_ITER_SYM_ADDR = 0x04, 648 TRACE_ITER_VERBOSE = 0x08, 649 TRACE_ITER_RAW = 0x10, 650 TRACE_ITER_HEX = 0x20, 651 TRACE_ITER_BIN = 0x40, 652 TRACE_ITER_BLOCK = 0x80, 653 TRACE_ITER_STACKTRACE = 0x100, 654 TRACE_ITER_PRINTK = 0x200, 655 TRACE_ITER_PREEMPTONLY = 0x400, 656 TRACE_ITER_BRANCH = 0x800, 657 TRACE_ITER_ANNOTATE = 0x1000, 658 TRACE_ITER_USERSTACKTRACE = 0x2000, 659 TRACE_ITER_SYM_USEROBJ = 0x4000, 660 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 661 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 662 TRACE_ITER_LATENCY_FMT = 0x20000, 663 TRACE_ITER_SLEEP_TIME = 0x40000, 664 TRACE_ITER_GRAPH_TIME = 0x80000, 665 TRACE_ITER_RECORD_CMD = 0x100000, 666 TRACE_ITER_OVERWRITE = 0x200000, 667 TRACE_ITER_STOP_ON_FREE = 0x400000, 668 TRACE_ITER_IRQ_INFO = 0x800000, 669 }; 670 671 /* 672 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 673 * control the output of kernel symbols. 674 */ 675 #define TRACE_ITER_SYM_MASK \ 676 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 677 678 extern struct tracer nop_trace; 679 680 #ifdef CONFIG_BRANCH_TRACER 681 extern int enable_branch_tracing(struct trace_array *tr); 682 extern void disable_branch_tracing(void); 683 static inline int trace_branch_enable(struct trace_array *tr) 684 { 685 if (trace_flags & TRACE_ITER_BRANCH) 686 return enable_branch_tracing(tr); 687 return 0; 688 } 689 static inline void trace_branch_disable(void) 690 { 691 /* due to races, always disable */ 692 disable_branch_tracing(); 693 } 694 #else 695 static inline int trace_branch_enable(struct trace_array *tr) 696 { 697 return 0; 698 } 699 static inline void trace_branch_disable(void) 700 { 701 } 702 #endif /* CONFIG_BRANCH_TRACER */ 703 704 /* set ring buffers to default size if not already done so */ 705 int tracing_update_buffers(void); 706 707 /* trace event type bit fields, not numeric */ 708 enum { 709 TRACE_EVENT_TYPE_PRINTF = 1, 710 TRACE_EVENT_TYPE_RAW = 2, 711 }; 712 713 struct ftrace_event_field { 714 struct list_head link; 715 char *name; 716 char *type; 717 int filter_type; 718 int offset; 719 int size; 720 int is_signed; 721 }; 722 723 struct event_filter { 724 int n_preds; /* Number assigned */ 725 int a_preds; /* allocated */ 726 struct filter_pred *preds; 727 struct filter_pred *root; 728 char *filter_string; 729 }; 730 731 struct event_subsystem { 732 struct list_head list; 733 const char *name; 734 struct dentry *entry; 735 struct event_filter *filter; 736 int nr_events; 737 int ref_count; 738 }; 739 740 #define FILTER_PRED_INVALID ((unsigned short)-1) 741 #define FILTER_PRED_IS_RIGHT (1 << 15) 742 #define FILTER_PRED_FOLD (1 << 15) 743 744 /* 745 * The max preds is the size of unsigned short with 746 * two flags at the MSBs. One bit is used for both the IS_RIGHT 747 * and FOLD flags. The other is reserved. 748 * 749 * 2^14 preds is way more than enough. 750 */ 751 #define MAX_FILTER_PRED 16384 752 753 struct filter_pred; 754 struct regex; 755 756 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 757 758 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 759 760 enum regex_type { 761 MATCH_FULL = 0, 762 MATCH_FRONT_ONLY, 763 MATCH_MIDDLE_ONLY, 764 MATCH_END_ONLY, 765 }; 766 767 struct regex { 768 char pattern[MAX_FILTER_STR_VAL]; 769 int len; 770 int field_len; 771 regex_match_func match; 772 }; 773 774 struct filter_pred { 775 filter_pred_fn_t fn; 776 u64 val; 777 struct regex regex; 778 unsigned short *ops; 779 struct ftrace_event_field *field; 780 int offset; 781 int not; 782 int op; 783 unsigned short index; 784 unsigned short parent; 785 unsigned short left; 786 unsigned short right; 787 }; 788 789 extern struct list_head ftrace_common_fields; 790 791 extern enum regex_type 792 filter_parse_regex(char *buff, int len, char **search, int *not); 793 extern void print_event_filter(struct ftrace_event_call *call, 794 struct trace_seq *s); 795 extern int apply_event_filter(struct ftrace_event_call *call, 796 char *filter_string); 797 extern int apply_subsystem_event_filter(struct event_subsystem *system, 798 char *filter_string); 799 extern void print_subsystem_event_filter(struct event_subsystem *system, 800 struct trace_seq *s); 801 extern int filter_assign_type(const char *type); 802 803 struct list_head * 804 trace_get_fields(struct ftrace_event_call *event_call); 805 806 static inline int 807 filter_check_discard(struct ftrace_event_call *call, void *rec, 808 struct ring_buffer *buffer, 809 struct ring_buffer_event *event) 810 { 811 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 812 !filter_match_preds(call->filter, rec)) { 813 ring_buffer_discard_commit(buffer, event); 814 return 1; 815 } 816 817 return 0; 818 } 819 820 extern void trace_event_enable_cmd_record(bool enable); 821 822 extern struct mutex event_mutex; 823 extern struct list_head ftrace_events; 824 825 extern const char *__start___trace_bprintk_fmt[]; 826 extern const char *__stop___trace_bprintk_fmt[]; 827 828 #undef FTRACE_ENTRY 829 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 830 extern struct ftrace_event_call \ 831 __attribute__((__aligned__(4))) event_##call; 832 #undef FTRACE_ENTRY_DUP 833 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 834 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 835 filter) 836 #include "trace_entries.h" 837 838 #ifdef CONFIG_PERF_EVENTS 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 #endif /* CONFIG_PERF_EVENTS */ 846 847 #endif /* _LINUX_KERNEL_TRACE_H */ 848