1 #ifndef _LINUX_KERNEL_TRACE_H 2 #define _LINUX_KERNEL_TRACE_H 3 4 #include <linux/fs.h> 5 #include <asm/atomic.h> 6 #include <linux/sched.h> 7 #include <linux/clocksource.h> 8 #include <linux/ring_buffer.h> 9 #include <linux/mmiotrace.h> 10 #include <linux/ftrace.h> 11 #include <trace/boot.h> 12 #include <trace/kmemtrace.h> 13 #include <trace/power.h> 14 15 enum trace_type { 16 __TRACE_FIRST_TYPE = 0, 17 18 TRACE_FN, 19 TRACE_CTX, 20 TRACE_WAKE, 21 TRACE_STACK, 22 TRACE_PRINT, 23 TRACE_BPRINT, 24 TRACE_SPECIAL, 25 TRACE_MMIO_RW, 26 TRACE_MMIO_MAP, 27 TRACE_BRANCH, 28 TRACE_BOOT_CALL, 29 TRACE_BOOT_RET, 30 TRACE_GRAPH_RET, 31 TRACE_GRAPH_ENT, 32 TRACE_USER_STACK, 33 TRACE_HW_BRANCHES, 34 TRACE_SYSCALL_ENTER, 35 TRACE_SYSCALL_EXIT, 36 TRACE_KMEM_ALLOC, 37 TRACE_KMEM_FREE, 38 TRACE_POWER, 39 TRACE_BLK, 40 41 __TRACE_LAST_TYPE, 42 }; 43 44 /* 45 * The trace entry - the most basic unit of tracing. This is what 46 * is printed in the end as a single line in the trace output, such as: 47 * 48 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter 49 */ 50 struct trace_entry { 51 unsigned char type; 52 unsigned char flags; 53 unsigned char preempt_count; 54 int pid; 55 int tgid; 56 }; 57 58 /* 59 * Function trace entry - function address and parent function addres: 60 */ 61 struct ftrace_entry { 62 struct trace_entry ent; 63 unsigned long ip; 64 unsigned long parent_ip; 65 }; 66 67 /* Function call entry */ 68 struct ftrace_graph_ent_entry { 69 struct trace_entry ent; 70 struct ftrace_graph_ent graph_ent; 71 }; 72 73 /* Function return entry */ 74 struct ftrace_graph_ret_entry { 75 struct trace_entry ent; 76 struct ftrace_graph_ret ret; 77 }; 78 extern struct tracer boot_tracer; 79 80 /* 81 * Context switch trace entry - which task (and prio) we switched from/to: 82 */ 83 struct ctx_switch_entry { 84 struct trace_entry ent; 85 unsigned int prev_pid; 86 unsigned char prev_prio; 87 unsigned char prev_state; 88 unsigned int next_pid; 89 unsigned char next_prio; 90 unsigned char next_state; 91 unsigned int next_cpu; 92 }; 93 94 /* 95 * Special (free-form) trace entry: 96 */ 97 struct special_entry { 98 struct trace_entry ent; 99 unsigned long arg1; 100 unsigned long arg2; 101 unsigned long arg3; 102 }; 103 104 /* 105 * Stack-trace entry: 106 */ 107 108 #define FTRACE_STACK_ENTRIES 8 109 110 struct stack_entry { 111 struct trace_entry ent; 112 unsigned long caller[FTRACE_STACK_ENTRIES]; 113 }; 114 115 struct userstack_entry { 116 struct trace_entry ent; 117 unsigned long caller[FTRACE_STACK_ENTRIES]; 118 }; 119 120 /* 121 * trace_printk entry: 122 */ 123 struct bprint_entry { 124 struct trace_entry ent; 125 unsigned long ip; 126 const char *fmt; 127 u32 buf[]; 128 }; 129 130 struct print_entry { 131 struct trace_entry ent; 132 unsigned long ip; 133 char buf[]; 134 }; 135 136 #define TRACE_OLD_SIZE 88 137 138 struct trace_field_cont { 139 unsigned char type; 140 /* Temporary till we get rid of this completely */ 141 char buf[TRACE_OLD_SIZE - 1]; 142 }; 143 144 struct trace_mmiotrace_rw { 145 struct trace_entry ent; 146 struct mmiotrace_rw rw; 147 }; 148 149 struct trace_mmiotrace_map { 150 struct trace_entry ent; 151 struct mmiotrace_map map; 152 }; 153 154 struct trace_boot_call { 155 struct trace_entry ent; 156 struct boot_trace_call boot_call; 157 }; 158 159 struct trace_boot_ret { 160 struct trace_entry ent; 161 struct boot_trace_ret boot_ret; 162 }; 163 164 #define TRACE_FUNC_SIZE 30 165 #define TRACE_FILE_SIZE 20 166 struct trace_branch { 167 struct trace_entry ent; 168 unsigned line; 169 char func[TRACE_FUNC_SIZE+1]; 170 char file[TRACE_FILE_SIZE+1]; 171 char correct; 172 }; 173 174 struct hw_branch_entry { 175 struct trace_entry ent; 176 u64 from; 177 u64 to; 178 }; 179 180 struct trace_power { 181 struct trace_entry ent; 182 struct power_trace state_data; 183 }; 184 185 enum kmemtrace_type_id { 186 KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ 187 KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ 188 KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ 189 }; 190 191 struct kmemtrace_alloc_entry { 192 struct trace_entry ent; 193 enum kmemtrace_type_id type_id; 194 unsigned long call_site; 195 const void *ptr; 196 size_t bytes_req; 197 size_t bytes_alloc; 198 gfp_t gfp_flags; 199 int node; 200 }; 201 202 struct kmemtrace_free_entry { 203 struct trace_entry ent; 204 enum kmemtrace_type_id type_id; 205 unsigned long call_site; 206 const void *ptr; 207 }; 208 209 struct syscall_trace_enter { 210 struct trace_entry ent; 211 int nr; 212 unsigned long args[]; 213 }; 214 215 struct syscall_trace_exit { 216 struct trace_entry ent; 217 int nr; 218 unsigned long ret; 219 }; 220 221 222 /* 223 * trace_flag_type is an enumeration that holds different 224 * states when a trace occurs. These are: 225 * IRQS_OFF - interrupts were disabled 226 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 227 * NEED_RESCED - reschedule is requested 228 * HARDIRQ - inside an interrupt handler 229 * SOFTIRQ - inside a softirq handler 230 */ 231 enum trace_flag_type { 232 TRACE_FLAG_IRQS_OFF = 0x01, 233 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 234 TRACE_FLAG_NEED_RESCHED = 0x04, 235 TRACE_FLAG_HARDIRQ = 0x08, 236 TRACE_FLAG_SOFTIRQ = 0x10, 237 }; 238 239 #define TRACE_BUF_SIZE 1024 240 241 /* 242 * The CPU trace array - it consists of thousands of trace entries 243 * plus some other descriptor data: (for example which task started 244 * the trace, etc.) 245 */ 246 struct trace_array_cpu { 247 atomic_t disabled; 248 void *buffer_page; /* ring buffer spare */ 249 250 /* these fields get copied into max-trace: */ 251 unsigned long trace_idx; 252 unsigned long overrun; 253 unsigned long saved_latency; 254 unsigned long critical_start; 255 unsigned long critical_end; 256 unsigned long critical_sequence; 257 unsigned long nice; 258 unsigned long policy; 259 unsigned long rt_priority; 260 cycle_t preempt_timestamp; 261 pid_t pid; 262 uid_t uid; 263 char comm[TASK_COMM_LEN]; 264 }; 265 266 struct trace_iterator; 267 268 /* 269 * The trace array - an array of per-CPU trace arrays. This is the 270 * highest level data structure that individual tracers deal with. 271 * They have on/off state as well: 272 */ 273 struct trace_array { 274 struct ring_buffer *buffer; 275 unsigned long entries; 276 int cpu; 277 cycle_t time_start; 278 struct task_struct *waiter; 279 struct trace_array_cpu *data[NR_CPUS]; 280 }; 281 282 #define FTRACE_CMP_TYPE(var, type) \ 283 __builtin_types_compatible_p(typeof(var), type *) 284 285 #undef IF_ASSIGN 286 #define IF_ASSIGN(var, entry, etype, id) \ 287 if (FTRACE_CMP_TYPE(var, etype)) { \ 288 var = (typeof(var))(entry); \ 289 WARN_ON(id && (entry)->type != id); \ 290 break; \ 291 } 292 293 /* Will cause compile errors if type is not found. */ 294 extern void __ftrace_bad_type(void); 295 296 /* 297 * The trace_assign_type is a verifier that the entry type is 298 * the same as the type being assigned. To add new types simply 299 * add a line with the following format: 300 * 301 * IF_ASSIGN(var, ent, type, id); 302 * 303 * Where "type" is the trace type that includes the trace_entry 304 * as the "ent" item. And "id" is the trace identifier that is 305 * used in the trace_type enum. 306 * 307 * If the type can have more than one id, then use zero. 308 */ 309 #define trace_assign_type(var, ent) \ 310 do { \ 311 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 312 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 313 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 314 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 315 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 316 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 317 IF_ASSIGN(var, ent, struct special_entry, 0); \ 318 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 319 TRACE_MMIO_RW); \ 320 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 321 TRACE_MMIO_MAP); \ 322 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ 323 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ 324 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 325 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 326 TRACE_GRAPH_ENT); \ 327 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 328 TRACE_GRAPH_RET); \ 329 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ 330 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ 331 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ 332 TRACE_KMEM_ALLOC); \ 333 IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ 334 TRACE_KMEM_FREE); \ 335 IF_ASSIGN(var, ent, struct syscall_trace_enter, \ 336 TRACE_SYSCALL_ENTER); \ 337 IF_ASSIGN(var, ent, struct syscall_trace_exit, \ 338 TRACE_SYSCALL_EXIT); \ 339 __ftrace_bad_type(); \ 340 } while (0) 341 342 /* Return values for print_line callback */ 343 enum print_line_t { 344 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ 345 TRACE_TYPE_HANDLED = 1, 346 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ 347 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ 348 }; 349 350 351 /* 352 * An option specific to a tracer. This is a boolean value. 353 * The bit is the bit index that sets its value on the 354 * flags value in struct tracer_flags. 355 */ 356 struct tracer_opt { 357 const char *name; /* Will appear on the trace_options file */ 358 u32 bit; /* Mask assigned in val field in tracer_flags */ 359 }; 360 361 /* 362 * The set of specific options for a tracer. Your tracer 363 * have to set the initial value of the flags val. 364 */ 365 struct tracer_flags { 366 u32 val; 367 struct tracer_opt *opts; 368 }; 369 370 /* Makes more easy to define a tracer opt */ 371 #define TRACER_OPT(s, b) .name = #s, .bit = b 372 373 374 /** 375 * struct tracer - a specific tracer and its callbacks to interact with debugfs 376 * @name: the name chosen to select it on the available_tracers file 377 * @init: called when one switches to this tracer (echo name > current_tracer) 378 * @reset: called when one switches to another tracer 379 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 380 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 381 * @open: called when the trace file is opened 382 * @pipe_open: called when the trace_pipe file is opened 383 * @wait_pipe: override how the user waits for traces on trace_pipe 384 * @close: called when the trace file is released 385 * @read: override the default read callback on trace_pipe 386 * @splice_read: override the default splice_read callback on trace_pipe 387 * @selftest: selftest to run on boot (see trace_selftest.c) 388 * @print_headers: override the first lines that describe your columns 389 * @print_line: callback that prints a trace 390 * @set_flag: signals one of your private flags changed (trace_options file) 391 * @flags: your private flags 392 */ 393 struct tracer { 394 const char *name; 395 int (*init)(struct trace_array *tr); 396 void (*reset)(struct trace_array *tr); 397 void (*start)(struct trace_array *tr); 398 void (*stop)(struct trace_array *tr); 399 void (*open)(struct trace_iterator *iter); 400 void (*pipe_open)(struct trace_iterator *iter); 401 void (*wait_pipe)(struct trace_iterator *iter); 402 void (*close)(struct trace_iterator *iter); 403 ssize_t (*read)(struct trace_iterator *iter, 404 struct file *filp, char __user *ubuf, 405 size_t cnt, loff_t *ppos); 406 ssize_t (*splice_read)(struct trace_iterator *iter, 407 struct file *filp, 408 loff_t *ppos, 409 struct pipe_inode_info *pipe, 410 size_t len, 411 unsigned int flags); 412 #ifdef CONFIG_FTRACE_STARTUP_TEST 413 int (*selftest)(struct tracer *trace, 414 struct trace_array *tr); 415 #endif 416 void (*print_header)(struct seq_file *m); 417 enum print_line_t (*print_line)(struct trace_iterator *iter); 418 /* If you handled the flag setting, return 0 */ 419 int (*set_flag)(u32 old_flags, u32 bit, int set); 420 struct tracer *next; 421 int print_max; 422 struct tracer_flags *flags; 423 struct tracer_stat *stats; 424 }; 425 426 struct trace_seq { 427 unsigned char buffer[PAGE_SIZE]; 428 unsigned int len; 429 unsigned int readpos; 430 }; 431 432 static inline void 433 trace_seq_init(struct trace_seq *s) 434 { 435 s->len = 0; 436 s->readpos = 0; 437 } 438 439 440 #define TRACE_PIPE_ALL_CPU -1 441 442 /* 443 * Trace iterator - used by printout routines who present trace 444 * results to users and which routines might sleep, etc: 445 */ 446 struct trace_iterator { 447 struct trace_array *tr; 448 struct tracer *trace; 449 void *private; 450 int cpu_file; 451 struct mutex mutex; 452 struct ring_buffer_iter *buffer_iter[NR_CPUS]; 453 454 /* The below is zeroed out in pipe_read */ 455 struct trace_seq seq; 456 struct trace_entry *ent; 457 int cpu; 458 u64 ts; 459 460 unsigned long iter_flags; 461 loff_t pos; 462 long idx; 463 464 cpumask_var_t started; 465 }; 466 467 int tracer_init(struct tracer *t, struct trace_array *tr); 468 int tracing_is_enabled(void); 469 void trace_wake_up(void); 470 void tracing_reset(struct trace_array *tr, int cpu); 471 void tracing_reset_online_cpus(struct trace_array *tr); 472 int tracing_open_generic(struct inode *inode, struct file *filp); 473 struct dentry *tracing_init_dentry(void); 474 void init_tracer_sysprof_debugfs(struct dentry *d_tracer); 475 476 struct ring_buffer_event; 477 478 struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr, 479 unsigned char type, 480 unsigned long len, 481 unsigned long flags, 482 int pc); 483 void trace_buffer_unlock_commit(struct trace_array *tr, 484 struct ring_buffer_event *event, 485 unsigned long flags, int pc); 486 487 struct ring_buffer_event * 488 trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, 489 unsigned long flags, int pc); 490 void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, 491 unsigned long flags, int pc); 492 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, 493 unsigned long flags, int pc); 494 495 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 496 struct trace_array_cpu *data); 497 498 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 499 int *ent_cpu, u64 *ent_ts); 500 501 void tracing_generic_entry_update(struct trace_entry *entry, 502 unsigned long flags, 503 int pc); 504 505 void default_wait_pipe(struct trace_iterator *iter); 506 void poll_wait_pipe(struct trace_iterator *iter); 507 508 void ftrace(struct trace_array *tr, 509 struct trace_array_cpu *data, 510 unsigned long ip, 511 unsigned long parent_ip, 512 unsigned long flags, int pc); 513 void tracing_sched_switch_trace(struct trace_array *tr, 514 struct task_struct *prev, 515 struct task_struct *next, 516 unsigned long flags, int pc); 517 void tracing_record_cmdline(struct task_struct *tsk); 518 519 void tracing_sched_wakeup_trace(struct trace_array *tr, 520 struct task_struct *wakee, 521 struct task_struct *cur, 522 unsigned long flags, int pc); 523 void trace_special(struct trace_array *tr, 524 struct trace_array_cpu *data, 525 unsigned long arg1, 526 unsigned long arg2, 527 unsigned long arg3, int pc); 528 void trace_function(struct trace_array *tr, 529 unsigned long ip, 530 unsigned long parent_ip, 531 unsigned long flags, int pc); 532 533 void trace_graph_return(struct ftrace_graph_ret *trace); 534 int trace_graph_entry(struct ftrace_graph_ent *trace); 535 536 void tracing_start_cmdline_record(void); 537 void tracing_stop_cmdline_record(void); 538 void tracing_sched_switch_assign_trace(struct trace_array *tr); 539 void tracing_stop_sched_switch_record(void); 540 void tracing_start_sched_switch_record(void); 541 int register_tracer(struct tracer *type); 542 void unregister_tracer(struct tracer *type); 543 544 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 545 546 extern unsigned long tracing_max_latency; 547 extern unsigned long tracing_thresh; 548 549 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 550 void update_max_tr_single(struct trace_array *tr, 551 struct task_struct *tsk, int cpu); 552 553 void __trace_stack(struct trace_array *tr, 554 unsigned long flags, 555 int skip, int pc); 556 557 extern cycle_t ftrace_now(int cpu); 558 559 #ifdef CONFIG_CONTEXT_SWITCH_TRACER 560 typedef void 561 (*tracer_switch_func_t)(void *private, 562 void *__rq, 563 struct task_struct *prev, 564 struct task_struct *next); 565 566 struct tracer_switch_ops { 567 tracer_switch_func_t func; 568 void *private; 569 struct tracer_switch_ops *next; 570 }; 571 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ 572 573 extern void trace_find_cmdline(int pid, char comm[]); 574 575 #ifdef CONFIG_DYNAMIC_FTRACE 576 extern unsigned long ftrace_update_tot_cnt; 577 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 578 extern int DYN_FTRACE_TEST_NAME(void); 579 #endif 580 581 #ifdef CONFIG_FTRACE_STARTUP_TEST 582 extern int trace_selftest_startup_function(struct tracer *trace, 583 struct trace_array *tr); 584 extern int trace_selftest_startup_function_graph(struct tracer *trace, 585 struct trace_array *tr); 586 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 587 struct trace_array *tr); 588 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 589 struct trace_array *tr); 590 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 591 struct trace_array *tr); 592 extern int trace_selftest_startup_wakeup(struct tracer *trace, 593 struct trace_array *tr); 594 extern int trace_selftest_startup_nop(struct tracer *trace, 595 struct trace_array *tr); 596 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 597 struct trace_array *tr); 598 extern int trace_selftest_startup_sysprof(struct tracer *trace, 599 struct trace_array *tr); 600 extern int trace_selftest_startup_branch(struct tracer *trace, 601 struct trace_array *tr); 602 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 603 604 extern void *head_page(struct trace_array_cpu *data); 605 extern unsigned long long ns2usecs(cycle_t nsec); 606 extern int 607 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 608 extern int 609 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 610 611 extern unsigned long trace_flags; 612 613 /* Standard output formatting function used for function return traces */ 614 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 615 extern enum print_line_t print_graph_function(struct trace_iterator *iter); 616 617 #ifdef CONFIG_DYNAMIC_FTRACE 618 /* TODO: make this variable */ 619 #define FTRACE_GRAPH_MAX_FUNCS 32 620 extern int ftrace_graph_count; 621 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 622 623 static inline int ftrace_graph_addr(unsigned long addr) 624 { 625 int i; 626 627 if (!ftrace_graph_count || test_tsk_trace_graph(current)) 628 return 1; 629 630 for (i = 0; i < ftrace_graph_count; i++) { 631 if (addr == ftrace_graph_funcs[i]) 632 return 1; 633 } 634 635 return 0; 636 } 637 #else 638 static inline int ftrace_trace_addr(unsigned long addr) 639 { 640 return 1; 641 } 642 static inline int ftrace_graph_addr(unsigned long addr) 643 { 644 return 1; 645 } 646 #endif /* CONFIG_DYNAMIC_FTRACE */ 647 648 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 649 static inline enum print_line_t 650 print_graph_function(struct trace_iterator *iter) 651 { 652 return TRACE_TYPE_UNHANDLED; 653 } 654 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 655 656 extern struct pid *ftrace_pid_trace; 657 658 static inline int ftrace_trace_task(struct task_struct *task) 659 { 660 if (!ftrace_pid_trace) 661 return 1; 662 663 return test_tsk_trace_trace(task); 664 } 665 666 /* 667 * trace_iterator_flags is an enumeration that defines bit 668 * positions into trace_flags that controls the output. 669 * 670 * NOTE: These bits must match the trace_options array in 671 * trace.c. 672 */ 673 enum trace_iterator_flags { 674 TRACE_ITER_PRINT_PARENT = 0x01, 675 TRACE_ITER_SYM_OFFSET = 0x02, 676 TRACE_ITER_SYM_ADDR = 0x04, 677 TRACE_ITER_VERBOSE = 0x08, 678 TRACE_ITER_RAW = 0x10, 679 TRACE_ITER_HEX = 0x20, 680 TRACE_ITER_BIN = 0x40, 681 TRACE_ITER_BLOCK = 0x80, 682 TRACE_ITER_STACKTRACE = 0x100, 683 TRACE_ITER_SCHED_TREE = 0x200, 684 TRACE_ITER_PRINTK = 0x400, 685 TRACE_ITER_PREEMPTONLY = 0x800, 686 TRACE_ITER_BRANCH = 0x1000, 687 TRACE_ITER_ANNOTATE = 0x2000, 688 TRACE_ITER_USERSTACKTRACE = 0x4000, 689 TRACE_ITER_SYM_USEROBJ = 0x8000, 690 TRACE_ITER_PRINTK_MSGONLY = 0x10000, 691 TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ 692 TRACE_ITER_LATENCY_FMT = 0x40000, 693 TRACE_ITER_GLOBAL_CLK = 0x80000, 694 TRACE_ITER_SLEEP_TIME = 0x100000, 695 }; 696 697 /* 698 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 699 * control the output of kernel symbols. 700 */ 701 #define TRACE_ITER_SYM_MASK \ 702 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 703 704 extern struct tracer nop_trace; 705 706 /** 707 * ftrace_preempt_disable - disable preemption scheduler safe 708 * 709 * When tracing can happen inside the scheduler, there exists 710 * cases that the tracing might happen before the need_resched 711 * flag is checked. If this happens and the tracer calls 712 * preempt_enable (after a disable), a schedule might take place 713 * causing an infinite recursion. 714 * 715 * To prevent this, we read the need_resched flag before 716 * disabling preemption. When we want to enable preemption we 717 * check the flag, if it is set, then we call preempt_enable_no_resched. 718 * Otherwise, we call preempt_enable. 719 * 720 * The rational for doing the above is that if need_resched is set 721 * and we have yet to reschedule, we are either in an atomic location 722 * (where we do not need to check for scheduling) or we are inside 723 * the scheduler and do not want to resched. 724 */ 725 static inline int ftrace_preempt_disable(void) 726 { 727 int resched; 728 729 resched = need_resched(); 730 preempt_disable_notrace(); 731 732 return resched; 733 } 734 735 /** 736 * ftrace_preempt_enable - enable preemption scheduler safe 737 * @resched: the return value from ftrace_preempt_disable 738 * 739 * This is a scheduler safe way to enable preemption and not miss 740 * any preemption checks. The disabled saved the state of preemption. 741 * If resched is set, then we are either inside an atomic or 742 * are inside the scheduler (we would have already scheduled 743 * otherwise). In this case, we do not want to call normal 744 * preempt_enable, but preempt_enable_no_resched instead. 745 */ 746 static inline void ftrace_preempt_enable(int resched) 747 { 748 if (resched) 749 preempt_enable_no_resched_notrace(); 750 else 751 preempt_enable_notrace(); 752 } 753 754 #ifdef CONFIG_BRANCH_TRACER 755 extern int enable_branch_tracing(struct trace_array *tr); 756 extern void disable_branch_tracing(void); 757 static inline int trace_branch_enable(struct trace_array *tr) 758 { 759 if (trace_flags & TRACE_ITER_BRANCH) 760 return enable_branch_tracing(tr); 761 return 0; 762 } 763 static inline void trace_branch_disable(void) 764 { 765 /* due to races, always disable */ 766 disable_branch_tracing(); 767 } 768 #else 769 static inline int trace_branch_enable(struct trace_array *tr) 770 { 771 return 0; 772 } 773 static inline void trace_branch_disable(void) 774 { 775 } 776 #endif /* CONFIG_BRANCH_TRACER */ 777 778 /* set ring buffers to default size if not already done so */ 779 int tracing_update_buffers(void); 780 781 /* trace event type bit fields, not numeric */ 782 enum { 783 TRACE_EVENT_TYPE_PRINTF = 1, 784 TRACE_EVENT_TYPE_RAW = 2, 785 }; 786 787 struct ftrace_event_field { 788 struct list_head link; 789 char *name; 790 char *type; 791 int offset; 792 int size; 793 }; 794 795 struct ftrace_event_call { 796 char *name; 797 char *system; 798 struct dentry *dir; 799 int enabled; 800 int (*regfunc)(void); 801 void (*unregfunc)(void); 802 int id; 803 int (*raw_init)(void); 804 int (*show_format)(struct trace_seq *s); 805 int (*define_fields)(void); 806 struct list_head fields; 807 struct filter_pred **preds; 808 809 #ifdef CONFIG_EVENT_PROFILE 810 atomic_t profile_count; 811 int (*profile_enable)(struct ftrace_event_call *); 812 void (*profile_disable)(struct ftrace_event_call *); 813 #endif 814 }; 815 816 struct event_subsystem { 817 struct list_head list; 818 const char *name; 819 struct dentry *entry; 820 struct filter_pred **preds; 821 }; 822 823 #define events_for_each(event) \ 824 for (event = __start_ftrace_events; \ 825 (unsigned long)event < (unsigned long)__stop_ftrace_events; \ 826 event++) 827 828 #define MAX_FILTER_PRED 8 829 830 struct filter_pred; 831 832 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 833 834 struct filter_pred { 835 filter_pred_fn_t fn; 836 u64 val; 837 char *str_val; 838 int str_len; 839 char *field_name; 840 int offset; 841 int not; 842 int or; 843 int compound; 844 int clear; 845 }; 846 847 int trace_define_field(struct ftrace_event_call *call, char *type, 848 char *name, int offset, int size); 849 extern void filter_free_pred(struct filter_pred *pred); 850 extern void filter_print_preds(struct filter_pred **preds, 851 struct trace_seq *s); 852 extern int filter_parse(char **pbuf, struct filter_pred *pred); 853 extern int filter_add_pred(struct ftrace_event_call *call, 854 struct filter_pred *pred); 855 extern void filter_free_preds(struct ftrace_event_call *call); 856 extern int filter_match_preds(struct ftrace_event_call *call, void *rec); 857 extern void filter_free_subsystem_preds(struct event_subsystem *system); 858 extern int filter_add_subsystem_pred(struct event_subsystem *system, 859 struct filter_pred *pred); 860 861 void event_trace_printk(unsigned long ip, const char *fmt, ...); 862 extern struct ftrace_event_call __start_ftrace_events[]; 863 extern struct ftrace_event_call __stop_ftrace_events[]; 864 865 #define for_each_event(event) \ 866 for (event = __start_ftrace_events; \ 867 (unsigned long)event < (unsigned long)__stop_ftrace_events; \ 868 event++) 869 870 extern const char *__start___trace_bprintk_fmt[]; 871 extern const char *__stop___trace_bprintk_fmt[]; 872 873 /* 874 * The double __builtin_constant_p is because gcc will give us an error 875 * if we try to allocate the static variable to fmt if it is not a 876 * constant. Even with the outer if statement optimizing out. 877 */ 878 #define event_trace_printk(ip, fmt, args...) \ 879 do { \ 880 __trace_printk_check_format(fmt, ##args); \ 881 tracing_record_cmdline(current); \ 882 if (__builtin_constant_p(fmt)) { \ 883 static const char *trace_printk_fmt \ 884 __attribute__((section("__trace_printk_fmt"))) = \ 885 __builtin_constant_p(fmt) ? fmt : NULL; \ 886 \ 887 __trace_bprintk(ip, trace_printk_fmt, ##args); \ 888 } else \ 889 __trace_printk(ip, fmt, ##args); \ 890 } while (0) 891 892 #endif /* _LINUX_KERNEL_TRACE_H */ 893