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/tracepoint.h> 11 #include <linux/ftrace.h> 12 #include <trace/boot.h> 13 #include <linux/kmemtrace.h> 14 15 #include <linux/trace_seq.h> 16 #include <linux/ftrace_event.h> 17 18 enum trace_type { 19 __TRACE_FIRST_TYPE = 0, 20 21 TRACE_FN, 22 TRACE_CTX, 23 TRACE_WAKE, 24 TRACE_STACK, 25 TRACE_PRINT, 26 TRACE_BPRINT, 27 TRACE_SPECIAL, 28 TRACE_MMIO_RW, 29 TRACE_MMIO_MAP, 30 TRACE_BRANCH, 31 TRACE_BOOT_CALL, 32 TRACE_BOOT_RET, 33 TRACE_GRAPH_RET, 34 TRACE_GRAPH_ENT, 35 TRACE_USER_STACK, 36 TRACE_HW_BRANCHES, 37 TRACE_KMEM_ALLOC, 38 TRACE_KMEM_FREE, 39 TRACE_BLK, 40 41 __TRACE_LAST_TYPE, 42 }; 43 44 enum kmemtrace_type_id { 45 KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ 46 KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ 47 KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ 48 }; 49 50 extern struct tracer boot_tracer; 51 52 #undef __field 53 #define __field(type, item) type item; 54 55 #undef __field_struct 56 #define __field_struct(type, item) __field(type, item) 57 58 #undef __field_desc 59 #define __field_desc(type, container, item) 60 61 #undef __array 62 #define __array(type, item, size) type item[size]; 63 64 #undef __array_desc 65 #define __array_desc(type, container, item, size) 66 67 #undef __dynamic_array 68 #define __dynamic_array(type, item) type item[]; 69 70 #undef F_STRUCT 71 #define F_STRUCT(args...) args 72 73 #undef FTRACE_ENTRY 74 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 75 struct struct_name { \ 76 struct trace_entry ent; \ 77 tstruct \ 78 } 79 80 #undef TP_ARGS 81 #define TP_ARGS(args...) args 82 83 #undef FTRACE_ENTRY_DUP 84 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 85 86 #include "trace_entries.h" 87 88 /* 89 * syscalls are special, and need special handling, this is why 90 * they are not included in trace_entries.h 91 */ 92 struct syscall_trace_enter { 93 struct trace_entry ent; 94 int nr; 95 unsigned long args[]; 96 }; 97 98 struct syscall_trace_exit { 99 struct trace_entry ent; 100 int nr; 101 unsigned long ret; 102 }; 103 104 /* 105 * trace_flag_type is an enumeration that holds different 106 * states when a trace occurs. These are: 107 * IRQS_OFF - interrupts were disabled 108 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 109 * NEED_RESCHED - reschedule is requested 110 * HARDIRQ - inside an interrupt handler 111 * SOFTIRQ - inside a softirq handler 112 */ 113 enum trace_flag_type { 114 TRACE_FLAG_IRQS_OFF = 0x01, 115 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 116 TRACE_FLAG_NEED_RESCHED = 0x04, 117 TRACE_FLAG_HARDIRQ = 0x08, 118 TRACE_FLAG_SOFTIRQ = 0x10, 119 }; 120 121 #define TRACE_BUF_SIZE 1024 122 123 /* 124 * The CPU trace array - it consists of thousands of trace entries 125 * plus some other descriptor data: (for example which task started 126 * the trace, etc.) 127 */ 128 struct trace_array_cpu { 129 atomic_t disabled; 130 void *buffer_page; /* ring buffer spare */ 131 132 unsigned long saved_latency; 133 unsigned long critical_start; 134 unsigned long critical_end; 135 unsigned long critical_sequence; 136 unsigned long nice; 137 unsigned long policy; 138 unsigned long rt_priority; 139 unsigned long skipped_entries; 140 cycle_t preempt_timestamp; 141 pid_t pid; 142 uid_t uid; 143 char comm[TASK_COMM_LEN]; 144 }; 145 146 /* 147 * The trace array - an array of per-CPU trace arrays. This is the 148 * highest level data structure that individual tracers deal with. 149 * They have on/off state as well: 150 */ 151 struct trace_array { 152 struct ring_buffer *buffer; 153 unsigned long entries; 154 int cpu; 155 cycle_t time_start; 156 struct task_struct *waiter; 157 struct trace_array_cpu *data[NR_CPUS]; 158 }; 159 160 #define FTRACE_CMP_TYPE(var, type) \ 161 __builtin_types_compatible_p(typeof(var), type *) 162 163 #undef IF_ASSIGN 164 #define IF_ASSIGN(var, entry, etype, id) \ 165 if (FTRACE_CMP_TYPE(var, etype)) { \ 166 var = (typeof(var))(entry); \ 167 WARN_ON(id && (entry)->type != id); \ 168 break; \ 169 } 170 171 /* Will cause compile errors if type is not found. */ 172 extern void __ftrace_bad_type(void); 173 174 /* 175 * The trace_assign_type is a verifier that the entry type is 176 * the same as the type being assigned. To add new types simply 177 * add a line with the following format: 178 * 179 * IF_ASSIGN(var, ent, type, id); 180 * 181 * Where "type" is the trace type that includes the trace_entry 182 * as the "ent" item. And "id" is the trace identifier that is 183 * used in the trace_type enum. 184 * 185 * If the type can have more than one id, then use zero. 186 */ 187 #define trace_assign_type(var, ent) \ 188 do { \ 189 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 190 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 191 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 192 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 193 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 194 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 195 IF_ASSIGN(var, ent, struct special_entry, 0); \ 196 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 197 TRACE_MMIO_RW); \ 198 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 199 TRACE_MMIO_MAP); \ 200 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ 201 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ 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 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ 208 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ 209 TRACE_KMEM_ALLOC); \ 210 IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ 211 TRACE_KMEM_FREE); \ 212 __ftrace_bad_type(); \ 213 } while (0) 214 215 /* 216 * An option specific to a tracer. This is a boolean value. 217 * The bit is the bit index that sets its value on the 218 * flags value in struct tracer_flags. 219 */ 220 struct tracer_opt { 221 const char *name; /* Will appear on the trace_options file */ 222 u32 bit; /* Mask assigned in val field in tracer_flags */ 223 }; 224 225 /* 226 * The set of specific options for a tracer. Your tracer 227 * have to set the initial value of the flags val. 228 */ 229 struct tracer_flags { 230 u32 val; 231 struct tracer_opt *opts; 232 }; 233 234 /* Makes more easy to define a tracer opt */ 235 #define TRACER_OPT(s, b) .name = #s, .bit = b 236 237 238 /** 239 * struct tracer - a specific tracer and its callbacks to interact with debugfs 240 * @name: the name chosen to select it on the available_tracers file 241 * @init: called when one switches to this tracer (echo name > current_tracer) 242 * @reset: called when one switches to another tracer 243 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 244 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 245 * @open: called when the trace file is opened 246 * @pipe_open: called when the trace_pipe file is opened 247 * @wait_pipe: override how the user waits for traces on trace_pipe 248 * @close: called when the trace file is released 249 * @read: override the default read callback on trace_pipe 250 * @splice_read: override the default splice_read callback on trace_pipe 251 * @selftest: selftest to run on boot (see trace_selftest.c) 252 * @print_headers: override the first lines that describe your columns 253 * @print_line: callback that prints a trace 254 * @set_flag: signals one of your private flags changed (trace_options file) 255 * @flags: your private flags 256 */ 257 struct tracer { 258 const char *name; 259 int (*init)(struct trace_array *tr); 260 void (*reset)(struct trace_array *tr); 261 void (*start)(struct trace_array *tr); 262 void (*stop)(struct trace_array *tr); 263 void (*open)(struct trace_iterator *iter); 264 void (*pipe_open)(struct trace_iterator *iter); 265 void (*wait_pipe)(struct trace_iterator *iter); 266 void (*close)(struct trace_iterator *iter); 267 ssize_t (*read)(struct trace_iterator *iter, 268 struct file *filp, char __user *ubuf, 269 size_t cnt, loff_t *ppos); 270 ssize_t (*splice_read)(struct trace_iterator *iter, 271 struct file *filp, 272 loff_t *ppos, 273 struct pipe_inode_info *pipe, 274 size_t len, 275 unsigned int flags); 276 #ifdef CONFIG_FTRACE_STARTUP_TEST 277 int (*selftest)(struct tracer *trace, 278 struct trace_array *tr); 279 #endif 280 void (*print_header)(struct seq_file *m); 281 enum print_line_t (*print_line)(struct trace_iterator *iter); 282 /* If you handled the flag setting, return 0 */ 283 int (*set_flag)(u32 old_flags, u32 bit, int set); 284 struct tracer *next; 285 int print_max; 286 struct tracer_flags *flags; 287 }; 288 289 290 #define TRACE_PIPE_ALL_CPU -1 291 292 int tracer_init(struct tracer *t, struct trace_array *tr); 293 int tracing_is_enabled(void); 294 void trace_wake_up(void); 295 void tracing_reset(struct trace_array *tr, int cpu); 296 void tracing_reset_online_cpus(struct trace_array *tr); 297 void tracing_reset_current(int cpu); 298 void tracing_reset_current_online_cpus(void); 299 int tracing_open_generic(struct inode *inode, struct file *filp); 300 struct dentry *trace_create_file(const char *name, 301 mode_t mode, 302 struct dentry *parent, 303 void *data, 304 const struct file_operations *fops); 305 306 struct dentry *tracing_init_dentry(void); 307 void init_tracer_sysprof_debugfs(struct dentry *d_tracer); 308 309 struct ring_buffer_event; 310 311 struct ring_buffer_event * 312 trace_buffer_lock_reserve(struct ring_buffer *buffer, 313 int type, 314 unsigned long len, 315 unsigned long flags, 316 int pc); 317 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 318 struct ring_buffer_event *event, 319 unsigned long flags, int pc); 320 321 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 322 struct trace_array_cpu *data); 323 324 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 325 int *ent_cpu, u64 *ent_ts); 326 327 void default_wait_pipe(struct trace_iterator *iter); 328 void poll_wait_pipe(struct trace_iterator *iter); 329 330 void ftrace(struct trace_array *tr, 331 struct trace_array_cpu *data, 332 unsigned long ip, 333 unsigned long parent_ip, 334 unsigned long flags, int pc); 335 void tracing_sched_switch_trace(struct trace_array *tr, 336 struct task_struct *prev, 337 struct task_struct *next, 338 unsigned long flags, int pc); 339 340 void tracing_sched_wakeup_trace(struct trace_array *tr, 341 struct task_struct *wakee, 342 struct task_struct *cur, 343 unsigned long flags, int pc); 344 void trace_special(struct trace_array *tr, 345 struct trace_array_cpu *data, 346 unsigned long arg1, 347 unsigned long arg2, 348 unsigned long arg3, int pc); 349 void trace_function(struct trace_array *tr, 350 unsigned long ip, 351 unsigned long parent_ip, 352 unsigned long flags, int pc); 353 354 void trace_graph_return(struct ftrace_graph_ret *trace); 355 int trace_graph_entry(struct ftrace_graph_ent *trace); 356 void set_graph_array(struct trace_array *tr); 357 358 void tracing_start_cmdline_record(void); 359 void tracing_stop_cmdline_record(void); 360 void tracing_sched_switch_assign_trace(struct trace_array *tr); 361 void tracing_stop_sched_switch_record(void); 362 void tracing_start_sched_switch_record(void); 363 int register_tracer(struct tracer *type); 364 void unregister_tracer(struct tracer *type); 365 int is_tracing_stopped(void); 366 367 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 368 369 #ifdef CONFIG_TRACER_MAX_TRACE 370 extern unsigned long tracing_max_latency; 371 extern unsigned long tracing_thresh; 372 373 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 374 void update_max_tr_single(struct trace_array *tr, 375 struct task_struct *tsk, int cpu); 376 #endif /* CONFIG_TRACER_MAX_TRACE */ 377 378 #ifdef CONFIG_STACKTRACE 379 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 380 int skip, int pc); 381 382 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 383 int pc); 384 385 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 386 int pc); 387 #else 388 static inline void ftrace_trace_stack(struct trace_array *tr, 389 unsigned long flags, int skip, int pc) 390 { 391 } 392 393 static inline void ftrace_trace_userstack(struct trace_array *tr, 394 unsigned long flags, int pc) 395 { 396 } 397 398 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 399 int skip, int pc) 400 { 401 } 402 #endif /* CONFIG_STACKTRACE */ 403 404 extern cycle_t ftrace_now(int cpu); 405 406 extern void trace_find_cmdline(int pid, char comm[]); 407 408 #ifdef CONFIG_DYNAMIC_FTRACE 409 extern unsigned long ftrace_update_tot_cnt; 410 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 411 extern int DYN_FTRACE_TEST_NAME(void); 412 #endif 413 414 extern int ring_buffer_expanded; 415 extern bool tracing_selftest_disabled; 416 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled); 417 418 #ifdef CONFIG_FTRACE_STARTUP_TEST 419 extern int trace_selftest_startup_function(struct tracer *trace, 420 struct trace_array *tr); 421 extern int trace_selftest_startup_function_graph(struct tracer *trace, 422 struct trace_array *tr); 423 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 424 struct trace_array *tr); 425 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 426 struct trace_array *tr); 427 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 428 struct trace_array *tr); 429 extern int trace_selftest_startup_wakeup(struct tracer *trace, 430 struct trace_array *tr); 431 extern int trace_selftest_startup_nop(struct tracer *trace, 432 struct trace_array *tr); 433 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 434 struct trace_array *tr); 435 extern int trace_selftest_startup_sysprof(struct tracer *trace, 436 struct trace_array *tr); 437 extern int trace_selftest_startup_branch(struct tracer *trace, 438 struct trace_array *tr); 439 extern int trace_selftest_startup_hw_branches(struct tracer *trace, 440 struct trace_array *tr); 441 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 442 443 extern void *head_page(struct trace_array_cpu *data); 444 extern unsigned long long ns2usecs(cycle_t nsec); 445 extern int 446 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 447 extern int 448 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 449 extern int 450 trace_array_vprintk(struct trace_array *tr, 451 unsigned long ip, const char *fmt, va_list args); 452 int trace_array_printk(struct trace_array *tr, 453 unsigned long ip, const char *fmt, ...); 454 455 extern unsigned long trace_flags; 456 457 extern int trace_clock_id; 458 459 /* Standard output formatting function used for function return traces */ 460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 461 extern enum print_line_t print_graph_function(struct trace_iterator *iter); 462 extern enum print_line_t 463 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 464 465 #ifdef CONFIG_DYNAMIC_FTRACE 466 /* TODO: make this variable */ 467 #define FTRACE_GRAPH_MAX_FUNCS 32 468 extern int ftrace_graph_count; 469 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 470 471 static inline int ftrace_graph_addr(unsigned long addr) 472 { 473 int i; 474 475 if (!ftrace_graph_count || test_tsk_trace_graph(current)) 476 return 1; 477 478 for (i = 0; i < ftrace_graph_count; i++) { 479 if (addr == ftrace_graph_funcs[i]) 480 return 1; 481 } 482 483 return 0; 484 } 485 #else 486 static inline int ftrace_trace_addr(unsigned long addr) 487 { 488 return 1; 489 } 490 static inline int ftrace_graph_addr(unsigned long addr) 491 { 492 return 1; 493 } 494 #endif /* CONFIG_DYNAMIC_FTRACE */ 495 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 496 static inline enum print_line_t 497 print_graph_function(struct trace_iterator *iter) 498 { 499 return TRACE_TYPE_UNHANDLED; 500 } 501 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 502 503 extern struct pid *ftrace_pid_trace; 504 505 #ifdef CONFIG_FUNCTION_TRACER 506 static inline int ftrace_trace_task(struct task_struct *task) 507 { 508 if (!ftrace_pid_trace) 509 return 1; 510 511 return test_tsk_trace_trace(task); 512 } 513 #else 514 static inline int ftrace_trace_task(struct task_struct *task) 515 { 516 return 1; 517 } 518 #endif 519 520 /* 521 * struct trace_parser - servers for reading the user input separated by spaces 522 * @cont: set if the input is not complete - no final space char was found 523 * @buffer: holds the parsed user input 524 * @idx: user input lenght 525 * @size: buffer size 526 */ 527 struct trace_parser { 528 bool cont; 529 char *buffer; 530 unsigned idx; 531 unsigned size; 532 }; 533 534 static inline bool trace_parser_loaded(struct trace_parser *parser) 535 { 536 return (parser->idx != 0); 537 } 538 539 static inline bool trace_parser_cont(struct trace_parser *parser) 540 { 541 return parser->cont; 542 } 543 544 static inline void trace_parser_clear(struct trace_parser *parser) 545 { 546 parser->cont = false; 547 parser->idx = 0; 548 } 549 550 extern int trace_parser_get_init(struct trace_parser *parser, int size); 551 extern void trace_parser_put(struct trace_parser *parser); 552 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 553 size_t cnt, loff_t *ppos); 554 555 /* 556 * trace_iterator_flags is an enumeration that defines bit 557 * positions into trace_flags that controls the output. 558 * 559 * NOTE: These bits must match the trace_options array in 560 * trace.c. 561 */ 562 enum trace_iterator_flags { 563 TRACE_ITER_PRINT_PARENT = 0x01, 564 TRACE_ITER_SYM_OFFSET = 0x02, 565 TRACE_ITER_SYM_ADDR = 0x04, 566 TRACE_ITER_VERBOSE = 0x08, 567 TRACE_ITER_RAW = 0x10, 568 TRACE_ITER_HEX = 0x20, 569 TRACE_ITER_BIN = 0x40, 570 TRACE_ITER_BLOCK = 0x80, 571 TRACE_ITER_STACKTRACE = 0x100, 572 TRACE_ITER_SCHED_TREE = 0x200, 573 TRACE_ITER_PRINTK = 0x400, 574 TRACE_ITER_PREEMPTONLY = 0x800, 575 TRACE_ITER_BRANCH = 0x1000, 576 TRACE_ITER_ANNOTATE = 0x2000, 577 TRACE_ITER_USERSTACKTRACE = 0x4000, 578 TRACE_ITER_SYM_USEROBJ = 0x8000, 579 TRACE_ITER_PRINTK_MSGONLY = 0x10000, 580 TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ 581 TRACE_ITER_LATENCY_FMT = 0x40000, 582 TRACE_ITER_SLEEP_TIME = 0x80000, 583 TRACE_ITER_GRAPH_TIME = 0x100000, 584 }; 585 586 /* 587 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 588 * control the output of kernel symbols. 589 */ 590 #define TRACE_ITER_SYM_MASK \ 591 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 592 593 extern struct tracer nop_trace; 594 595 /** 596 * ftrace_preempt_disable - disable preemption scheduler safe 597 * 598 * When tracing can happen inside the scheduler, there exists 599 * cases that the tracing might happen before the need_resched 600 * flag is checked. If this happens and the tracer calls 601 * preempt_enable (after a disable), a schedule might take place 602 * causing an infinite recursion. 603 * 604 * To prevent this, we read the need_resched flag before 605 * disabling preemption. When we want to enable preemption we 606 * check the flag, if it is set, then we call preempt_enable_no_resched. 607 * Otherwise, we call preempt_enable. 608 * 609 * The rational for doing the above is that if need_resched is set 610 * and we have yet to reschedule, we are either in an atomic location 611 * (where we do not need to check for scheduling) or we are inside 612 * the scheduler and do not want to resched. 613 */ 614 static inline int ftrace_preempt_disable(void) 615 { 616 int resched; 617 618 resched = need_resched(); 619 preempt_disable_notrace(); 620 621 return resched; 622 } 623 624 /** 625 * ftrace_preempt_enable - enable preemption scheduler safe 626 * @resched: the return value from ftrace_preempt_disable 627 * 628 * This is a scheduler safe way to enable preemption and not miss 629 * any preemption checks. The disabled saved the state of preemption. 630 * If resched is set, then we are either inside an atomic or 631 * are inside the scheduler (we would have already scheduled 632 * otherwise). In this case, we do not want to call normal 633 * preempt_enable, but preempt_enable_no_resched instead. 634 */ 635 static inline void ftrace_preempt_enable(int resched) 636 { 637 if (resched) 638 preempt_enable_no_resched_notrace(); 639 else 640 preempt_enable_notrace(); 641 } 642 643 #ifdef CONFIG_BRANCH_TRACER 644 extern int enable_branch_tracing(struct trace_array *tr); 645 extern void disable_branch_tracing(void); 646 static inline int trace_branch_enable(struct trace_array *tr) 647 { 648 if (trace_flags & TRACE_ITER_BRANCH) 649 return enable_branch_tracing(tr); 650 return 0; 651 } 652 static inline void trace_branch_disable(void) 653 { 654 /* due to races, always disable */ 655 disable_branch_tracing(); 656 } 657 #else 658 static inline int trace_branch_enable(struct trace_array *tr) 659 { 660 return 0; 661 } 662 static inline void trace_branch_disable(void) 663 { 664 } 665 #endif /* CONFIG_BRANCH_TRACER */ 666 667 /* set ring buffers to default size if not already done so */ 668 int tracing_update_buffers(void); 669 670 /* trace event type bit fields, not numeric */ 671 enum { 672 TRACE_EVENT_TYPE_PRINTF = 1, 673 TRACE_EVENT_TYPE_RAW = 2, 674 }; 675 676 struct ftrace_event_field { 677 struct list_head link; 678 char *name; 679 char *type; 680 int filter_type; 681 int offset; 682 int size; 683 int is_signed; 684 }; 685 686 struct event_filter { 687 int n_preds; 688 struct filter_pred **preds; 689 char *filter_string; 690 bool no_reset; 691 }; 692 693 struct event_subsystem { 694 struct list_head list; 695 const char *name; 696 struct dentry *entry; 697 struct event_filter *filter; 698 int nr_events; 699 }; 700 701 struct filter_pred; 702 703 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, 704 int val1, int val2); 705 706 struct filter_pred { 707 filter_pred_fn_t fn; 708 u64 val; 709 char str_val[MAX_FILTER_STR_VAL]; 710 int str_len; 711 char *field_name; 712 int offset; 713 int not; 714 int op; 715 int pop_n; 716 }; 717 718 extern void print_event_filter(struct ftrace_event_call *call, 719 struct trace_seq *s); 720 extern int apply_event_filter(struct ftrace_event_call *call, 721 char *filter_string); 722 extern int apply_subsystem_event_filter(struct event_subsystem *system, 723 char *filter_string); 724 extern void print_subsystem_event_filter(struct event_subsystem *system, 725 struct trace_seq *s); 726 extern int filter_assign_type(const char *type); 727 728 static inline int 729 filter_check_discard(struct ftrace_event_call *call, void *rec, 730 struct ring_buffer *buffer, 731 struct ring_buffer_event *event) 732 { 733 if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) { 734 ring_buffer_discard_commit(buffer, event); 735 return 1; 736 } 737 738 return 0; 739 } 740 741 extern struct mutex event_mutex; 742 extern struct list_head ftrace_events; 743 744 extern const char *__start___trace_bprintk_fmt[]; 745 extern const char *__stop___trace_bprintk_fmt[]; 746 747 #undef FTRACE_ENTRY 748 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 749 extern struct ftrace_event_call event_##call; 750 #undef FTRACE_ENTRY_DUP 751 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 752 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 753 #include "trace_entries.h" 754 755 #endif /* _LINUX_KERNEL_TRACE_H */ 756