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 #include <linux/hw_breakpoint.h> 15 16 #include <linux/trace_seq.h> 17 #include <linux/ftrace_event.h> 18 19 enum trace_type { 20 __TRACE_FIRST_TYPE = 0, 21 22 TRACE_FN, 23 TRACE_CTX, 24 TRACE_WAKE, 25 TRACE_STACK, 26 TRACE_PRINT, 27 TRACE_BPRINT, 28 TRACE_SPECIAL, 29 TRACE_MMIO_RW, 30 TRACE_MMIO_MAP, 31 TRACE_BRANCH, 32 TRACE_BOOT_CALL, 33 TRACE_BOOT_RET, 34 TRACE_GRAPH_RET, 35 TRACE_GRAPH_ENT, 36 TRACE_USER_STACK, 37 TRACE_HW_BRANCHES, 38 TRACE_KMEM_ALLOC, 39 TRACE_KMEM_FREE, 40 TRACE_BLK, 41 TRACE_KSYM, 42 43 __TRACE_LAST_TYPE, 44 }; 45 46 enum kmemtrace_type_id { 47 KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ 48 KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ 49 KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ 50 }; 51 52 extern struct tracer boot_tracer; 53 54 #undef __field 55 #define __field(type, item) type item; 56 57 #undef __field_struct 58 #define __field_struct(type, item) __field(type, item) 59 60 #undef __field_desc 61 #define __field_desc(type, container, item) 62 63 #undef __array 64 #define __array(type, item, size) type item[size]; 65 66 #undef __array_desc 67 #define __array_desc(type, container, item, size) 68 69 #undef __dynamic_array 70 #define __dynamic_array(type, item) type item[]; 71 72 #undef F_STRUCT 73 #define F_STRUCT(args...) args 74 75 #undef FTRACE_ENTRY 76 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 77 struct struct_name { \ 78 struct trace_entry ent; \ 79 tstruct \ 80 } 81 82 #undef TP_ARGS 83 #define TP_ARGS(args...) args 84 85 #undef FTRACE_ENTRY_DUP 86 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 87 88 #include "trace_entries.h" 89 90 /* 91 * syscalls are special, and need special handling, this is why 92 * they are not included in trace_entries.h 93 */ 94 struct syscall_trace_enter { 95 struct trace_entry ent; 96 int nr; 97 unsigned long args[]; 98 }; 99 100 struct syscall_trace_exit { 101 struct trace_entry ent; 102 int nr; 103 unsigned long ret; 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 special_entry, 0); \ 198 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 199 TRACE_MMIO_RW); \ 200 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 201 TRACE_MMIO_MAP); \ 202 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ 203 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ 204 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 205 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 206 TRACE_GRAPH_ENT); \ 207 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 208 TRACE_GRAPH_RET); \ 209 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ 210 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ 211 TRACE_KMEM_ALLOC); \ 212 IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ 213 TRACE_KMEM_FREE); \ 214 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\ 215 __ftrace_bad_type(); \ 216 } while (0) 217 218 /* 219 * An option specific to a tracer. This is a boolean value. 220 * The bit is the bit index that sets its value on the 221 * flags value in struct tracer_flags. 222 */ 223 struct tracer_opt { 224 const char *name; /* Will appear on the trace_options file */ 225 u32 bit; /* Mask assigned in val field in tracer_flags */ 226 }; 227 228 /* 229 * The set of specific options for a tracer. Your tracer 230 * have to set the initial value of the flags val. 231 */ 232 struct tracer_flags { 233 u32 val; 234 struct tracer_opt *opts; 235 }; 236 237 /* Makes more easy to define a tracer opt */ 238 #define TRACER_OPT(s, b) .name = #s, .bit = b 239 240 241 /** 242 * struct tracer - a specific tracer and its callbacks to interact with debugfs 243 * @name: the name chosen to select it on the available_tracers file 244 * @init: called when one switches to this tracer (echo name > current_tracer) 245 * @reset: called when one switches to another tracer 246 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 247 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 248 * @open: called when the trace file is opened 249 * @pipe_open: called when the trace_pipe file is opened 250 * @wait_pipe: override how the user waits for traces on trace_pipe 251 * @close: called when the trace file is released 252 * @read: override the default read callback on trace_pipe 253 * @splice_read: override the default splice_read callback on trace_pipe 254 * @selftest: selftest to run on boot (see trace_selftest.c) 255 * @print_headers: override the first lines that describe your columns 256 * @print_line: callback that prints a trace 257 * @set_flag: signals one of your private flags changed (trace_options file) 258 * @flags: your private flags 259 */ 260 struct tracer { 261 const char *name; 262 int (*init)(struct trace_array *tr); 263 void (*reset)(struct trace_array *tr); 264 void (*start)(struct trace_array *tr); 265 void (*stop)(struct trace_array *tr); 266 void (*open)(struct trace_iterator *iter); 267 void (*pipe_open)(struct trace_iterator *iter); 268 void (*wait_pipe)(struct trace_iterator *iter); 269 void (*close)(struct trace_iterator *iter); 270 ssize_t (*read)(struct trace_iterator *iter, 271 struct file *filp, char __user *ubuf, 272 size_t cnt, loff_t *ppos); 273 ssize_t (*splice_read)(struct trace_iterator *iter, 274 struct file *filp, 275 loff_t *ppos, 276 struct pipe_inode_info *pipe, 277 size_t len, 278 unsigned int flags); 279 #ifdef CONFIG_FTRACE_STARTUP_TEST 280 int (*selftest)(struct tracer *trace, 281 struct trace_array *tr); 282 #endif 283 void (*print_header)(struct seq_file *m); 284 enum print_line_t (*print_line)(struct trace_iterator *iter); 285 /* If you handled the flag setting, return 0 */ 286 int (*set_flag)(u32 old_flags, u32 bit, int set); 287 struct tracer *next; 288 int print_max; 289 struct tracer_flags *flags; 290 }; 291 292 293 #define TRACE_PIPE_ALL_CPU -1 294 295 int tracer_init(struct tracer *t, struct trace_array *tr); 296 int tracing_is_enabled(void); 297 void trace_wake_up(void); 298 void tracing_reset(struct trace_array *tr, int cpu); 299 void tracing_reset_online_cpus(struct trace_array *tr); 300 void tracing_reset_current(int cpu); 301 void tracing_reset_current_online_cpus(void); 302 int tracing_open_generic(struct inode *inode, struct file *filp); 303 struct dentry *trace_create_file(const char *name, 304 mode_t mode, 305 struct dentry *parent, 306 void *data, 307 const struct file_operations *fops); 308 309 struct dentry *tracing_init_dentry(void); 310 void init_tracer_sysprof_debugfs(struct dentry *d_tracer); 311 312 struct ring_buffer_event; 313 314 struct ring_buffer_event * 315 trace_buffer_lock_reserve(struct ring_buffer *buffer, 316 int type, 317 unsigned long len, 318 unsigned long flags, 319 int pc); 320 void trace_buffer_unlock_commit(struct ring_buffer *buffer, 321 struct ring_buffer_event *event, 322 unsigned long flags, int pc); 323 324 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 325 struct trace_array_cpu *data); 326 327 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 328 int *ent_cpu, u64 *ent_ts); 329 330 void default_wait_pipe(struct trace_iterator *iter); 331 void poll_wait_pipe(struct trace_iterator *iter); 332 333 void ftrace(struct trace_array *tr, 334 struct trace_array_cpu *data, 335 unsigned long ip, 336 unsigned long parent_ip, 337 unsigned long flags, int pc); 338 void tracing_sched_switch_trace(struct trace_array *tr, 339 struct task_struct *prev, 340 struct task_struct *next, 341 unsigned long flags, int pc); 342 343 void tracing_sched_wakeup_trace(struct trace_array *tr, 344 struct task_struct *wakee, 345 struct task_struct *cur, 346 unsigned long flags, int pc); 347 void trace_special(struct trace_array *tr, 348 struct trace_array_cpu *data, 349 unsigned long arg1, 350 unsigned long arg2, 351 unsigned long arg3, int pc); 352 void trace_function(struct trace_array *tr, 353 unsigned long ip, 354 unsigned long parent_ip, 355 unsigned long flags, int pc); 356 357 void trace_graph_return(struct ftrace_graph_ret *trace); 358 int trace_graph_entry(struct ftrace_graph_ent *trace); 359 void set_graph_array(struct trace_array *tr); 360 361 void tracing_start_cmdline_record(void); 362 void tracing_stop_cmdline_record(void); 363 void tracing_sched_switch_assign_trace(struct trace_array *tr); 364 void tracing_stop_sched_switch_record(void); 365 void tracing_start_sched_switch_record(void); 366 int register_tracer(struct tracer *type); 367 void unregister_tracer(struct tracer *type); 368 int is_tracing_stopped(void); 369 370 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr); 371 372 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 373 374 #ifdef CONFIG_TRACER_MAX_TRACE 375 extern unsigned long tracing_max_latency; 376 extern unsigned long tracing_thresh; 377 378 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 379 void update_max_tr_single(struct trace_array *tr, 380 struct task_struct *tsk, int cpu); 381 #endif /* CONFIG_TRACER_MAX_TRACE */ 382 383 #ifdef CONFIG_STACKTRACE 384 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 385 int skip, int pc); 386 387 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 388 int pc); 389 390 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 391 int pc); 392 #else 393 static inline void ftrace_trace_stack(struct trace_array *tr, 394 unsigned long flags, int skip, int pc) 395 { 396 } 397 398 static inline void ftrace_trace_userstack(struct trace_array *tr, 399 unsigned long flags, int pc) 400 { 401 } 402 403 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 404 int skip, int pc) 405 { 406 } 407 #endif /* CONFIG_STACKTRACE */ 408 409 extern cycle_t ftrace_now(int cpu); 410 411 extern void trace_find_cmdline(int pid, char comm[]); 412 413 #ifdef CONFIG_DYNAMIC_FTRACE 414 extern unsigned long ftrace_update_tot_cnt; 415 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 416 extern int DYN_FTRACE_TEST_NAME(void); 417 #endif 418 419 extern int ring_buffer_expanded; 420 extern bool tracing_selftest_disabled; 421 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled); 422 423 #ifdef CONFIG_FTRACE_STARTUP_TEST 424 extern int trace_selftest_startup_function(struct tracer *trace, 425 struct trace_array *tr); 426 extern int trace_selftest_startup_function_graph(struct tracer *trace, 427 struct trace_array *tr); 428 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 429 struct trace_array *tr); 430 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 431 struct trace_array *tr); 432 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 433 struct trace_array *tr); 434 extern int trace_selftest_startup_wakeup(struct tracer *trace, 435 struct trace_array *tr); 436 extern int trace_selftest_startup_nop(struct tracer *trace, 437 struct trace_array *tr); 438 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 439 struct trace_array *tr); 440 extern int trace_selftest_startup_sysprof(struct tracer *trace, 441 struct trace_array *tr); 442 extern int trace_selftest_startup_branch(struct tracer *trace, 443 struct trace_array *tr); 444 extern int trace_selftest_startup_hw_branches(struct tracer *trace, 445 struct trace_array *tr); 446 extern int trace_selftest_startup_ksym(struct tracer *trace, 447 struct trace_array *tr); 448 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 449 450 extern void *head_page(struct trace_array_cpu *data); 451 extern unsigned long long ns2usecs(cycle_t nsec); 452 extern int 453 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 454 extern int 455 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 456 extern int 457 trace_array_vprintk(struct trace_array *tr, 458 unsigned long ip, const char *fmt, va_list args); 459 int trace_array_printk(struct trace_array *tr, 460 unsigned long ip, const char *fmt, ...); 461 462 extern unsigned long trace_flags; 463 464 extern int trace_clock_id; 465 466 /* Standard output formatting function used for function return traces */ 467 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 468 extern enum print_line_t print_graph_function(struct trace_iterator *iter); 469 extern enum print_line_t 470 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 471 472 #ifdef CONFIG_DYNAMIC_FTRACE 473 /* TODO: make this variable */ 474 #define FTRACE_GRAPH_MAX_FUNCS 32 475 extern int ftrace_graph_count; 476 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 477 478 static inline int ftrace_graph_addr(unsigned long addr) 479 { 480 int i; 481 482 if (!ftrace_graph_count || test_tsk_trace_graph(current)) 483 return 1; 484 485 for (i = 0; i < ftrace_graph_count; i++) { 486 if (addr == ftrace_graph_funcs[i]) 487 return 1; 488 } 489 490 return 0; 491 } 492 #else 493 static inline int ftrace_graph_addr(unsigned long addr) 494 { 495 return 1; 496 } 497 #endif /* CONFIG_DYNAMIC_FTRACE */ 498 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 499 static inline enum print_line_t 500 print_graph_function(struct trace_iterator *iter) 501 { 502 return TRACE_TYPE_UNHANDLED; 503 } 504 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 505 506 extern struct list_head ftrace_pids; 507 508 #ifdef CONFIG_FUNCTION_TRACER 509 static inline int ftrace_trace_task(struct task_struct *task) 510 { 511 if (list_empty(&ftrace_pids)) 512 return 1; 513 514 return test_tsk_trace_trace(task); 515 } 516 #else 517 static inline int ftrace_trace_task(struct task_struct *task) 518 { 519 return 1; 520 } 521 #endif 522 523 /* 524 * struct trace_parser - servers for reading the user input separated by spaces 525 * @cont: set if the input is not complete - no final space char was found 526 * @buffer: holds the parsed user input 527 * @idx: user input lenght 528 * @size: buffer size 529 */ 530 struct trace_parser { 531 bool cont; 532 char *buffer; 533 unsigned idx; 534 unsigned size; 535 }; 536 537 static inline bool trace_parser_loaded(struct trace_parser *parser) 538 { 539 return (parser->idx != 0); 540 } 541 542 static inline bool trace_parser_cont(struct trace_parser *parser) 543 { 544 return parser->cont; 545 } 546 547 static inline void trace_parser_clear(struct trace_parser *parser) 548 { 549 parser->cont = false; 550 parser->idx = 0; 551 } 552 553 extern int trace_parser_get_init(struct trace_parser *parser, int size); 554 extern void trace_parser_put(struct trace_parser *parser); 555 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 556 size_t cnt, loff_t *ppos); 557 558 /* 559 * trace_iterator_flags is an enumeration that defines bit 560 * positions into trace_flags that controls the output. 561 * 562 * NOTE: These bits must match the trace_options array in 563 * trace.c. 564 */ 565 enum trace_iterator_flags { 566 TRACE_ITER_PRINT_PARENT = 0x01, 567 TRACE_ITER_SYM_OFFSET = 0x02, 568 TRACE_ITER_SYM_ADDR = 0x04, 569 TRACE_ITER_VERBOSE = 0x08, 570 TRACE_ITER_RAW = 0x10, 571 TRACE_ITER_HEX = 0x20, 572 TRACE_ITER_BIN = 0x40, 573 TRACE_ITER_BLOCK = 0x80, 574 TRACE_ITER_STACKTRACE = 0x100, 575 TRACE_ITER_SCHED_TREE = 0x200, 576 TRACE_ITER_PRINTK = 0x400, 577 TRACE_ITER_PREEMPTONLY = 0x800, 578 TRACE_ITER_BRANCH = 0x1000, 579 TRACE_ITER_ANNOTATE = 0x2000, 580 TRACE_ITER_USERSTACKTRACE = 0x4000, 581 TRACE_ITER_SYM_USEROBJ = 0x8000, 582 TRACE_ITER_PRINTK_MSGONLY = 0x10000, 583 TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ 584 TRACE_ITER_LATENCY_FMT = 0x40000, 585 TRACE_ITER_SLEEP_TIME = 0x80000, 586 TRACE_ITER_GRAPH_TIME = 0x100000, 587 }; 588 589 /* 590 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 591 * control the output of kernel symbols. 592 */ 593 #define TRACE_ITER_SYM_MASK \ 594 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 595 596 extern struct tracer nop_trace; 597 598 /** 599 * ftrace_preempt_disable - disable preemption scheduler safe 600 * 601 * When tracing can happen inside the scheduler, there exists 602 * cases that the tracing might happen before the need_resched 603 * flag is checked. If this happens and the tracer calls 604 * preempt_enable (after a disable), a schedule might take place 605 * causing an infinite recursion. 606 * 607 * To prevent this, we read the need_resched flag before 608 * disabling preemption. When we want to enable preemption we 609 * check the flag, if it is set, then we call preempt_enable_no_resched. 610 * Otherwise, we call preempt_enable. 611 * 612 * The rational for doing the above is that if need_resched is set 613 * and we have yet to reschedule, we are either in an atomic location 614 * (where we do not need to check for scheduling) or we are inside 615 * the scheduler and do not want to resched. 616 */ 617 static inline int ftrace_preempt_disable(void) 618 { 619 int resched; 620 621 resched = need_resched(); 622 preempt_disable_notrace(); 623 624 return resched; 625 } 626 627 /** 628 * ftrace_preempt_enable - enable preemption scheduler safe 629 * @resched: the return value from ftrace_preempt_disable 630 * 631 * This is a scheduler safe way to enable preemption and not miss 632 * any preemption checks. The disabled saved the state of preemption. 633 * If resched is set, then we are either inside an atomic or 634 * are inside the scheduler (we would have already scheduled 635 * otherwise). In this case, we do not want to call normal 636 * preempt_enable, but preempt_enable_no_resched instead. 637 */ 638 static inline void ftrace_preempt_enable(int resched) 639 { 640 if (resched) 641 preempt_enable_no_resched_notrace(); 642 else 643 preempt_enable_notrace(); 644 } 645 646 #ifdef CONFIG_BRANCH_TRACER 647 extern int enable_branch_tracing(struct trace_array *tr); 648 extern void disable_branch_tracing(void); 649 static inline int trace_branch_enable(struct trace_array *tr) 650 { 651 if (trace_flags & TRACE_ITER_BRANCH) 652 return enable_branch_tracing(tr); 653 return 0; 654 } 655 static inline void trace_branch_disable(void) 656 { 657 /* due to races, always disable */ 658 disable_branch_tracing(); 659 } 660 #else 661 static inline int trace_branch_enable(struct trace_array *tr) 662 { 663 return 0; 664 } 665 static inline void trace_branch_disable(void) 666 { 667 } 668 #endif /* CONFIG_BRANCH_TRACER */ 669 670 /* set ring buffers to default size if not already done so */ 671 int tracing_update_buffers(void); 672 673 /* trace event type bit fields, not numeric */ 674 enum { 675 TRACE_EVENT_TYPE_PRINTF = 1, 676 TRACE_EVENT_TYPE_RAW = 2, 677 }; 678 679 struct ftrace_event_field { 680 struct list_head link; 681 char *name; 682 char *type; 683 int filter_type; 684 int offset; 685 int size; 686 int is_signed; 687 }; 688 689 struct event_filter { 690 int n_preds; 691 struct filter_pred **preds; 692 char *filter_string; 693 }; 694 695 struct event_subsystem { 696 struct list_head list; 697 const char *name; 698 struct dentry *entry; 699 struct event_filter *filter; 700 int nr_events; 701 }; 702 703 struct filter_pred; 704 struct regex; 705 706 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, 707 int val1, int val2); 708 709 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 710 711 enum regex_type { 712 MATCH_FULL = 0, 713 MATCH_FRONT_ONLY, 714 MATCH_MIDDLE_ONLY, 715 MATCH_END_ONLY, 716 }; 717 718 struct regex { 719 char pattern[MAX_FILTER_STR_VAL]; 720 int len; 721 int field_len; 722 regex_match_func match; 723 }; 724 725 struct filter_pred { 726 filter_pred_fn_t fn; 727 u64 val; 728 struct regex regex; 729 char *field_name; 730 int offset; 731 int not; 732 int op; 733 int pop_n; 734 }; 735 736 extern enum regex_type 737 filter_parse_regex(char *buff, int len, char **search, int *not); 738 extern void print_event_filter(struct ftrace_event_call *call, 739 struct trace_seq *s); 740 extern int apply_event_filter(struct ftrace_event_call *call, 741 char *filter_string); 742 extern int apply_subsystem_event_filter(struct event_subsystem *system, 743 char *filter_string); 744 extern void print_subsystem_event_filter(struct event_subsystem *system, 745 struct trace_seq *s); 746 extern int filter_assign_type(const char *type); 747 748 static inline int 749 filter_check_discard(struct ftrace_event_call *call, void *rec, 750 struct ring_buffer *buffer, 751 struct ring_buffer_event *event) 752 { 753 if (unlikely(call->filter_active) && 754 !filter_match_preds(call->filter, rec)) { 755 ring_buffer_discard_commit(buffer, event); 756 return 1; 757 } 758 759 return 0; 760 } 761 762 extern struct mutex event_mutex; 763 extern struct list_head ftrace_events; 764 765 extern const char *__start___trace_bprintk_fmt[]; 766 extern const char *__stop___trace_bprintk_fmt[]; 767 768 #undef FTRACE_ENTRY 769 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 770 extern struct ftrace_event_call event_##call; 771 #undef FTRACE_ENTRY_DUP 772 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 773 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 774 #include "trace_entries.h" 775 776 #endif /* _LINUX_KERNEL_TRACE_H */ 777