kernel/trace/trace.h

   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 <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_SPECIAL,
  26         TRACE_MMIO_RW,
  27         TRACE_MMIO_MAP,
  28         TRACE_BRANCH,
  29         TRACE_GRAPH_RET,
  30         TRACE_GRAPH_ENT,
  31         TRACE_USER_STACK,
  32         TRACE_BLK,
  33         TRACE_KSYM,
  34
  35         __TRACE_LAST_TYPE,
  36 };
  37
  38
  39 #undef __field
  40 #define __field(type, item)             type    item;
  41
  42 #undef __field_struct
  43 #define __field_struct(type, item)      __field(type, item)
  44
  45 #undef __field_desc
  46 #define __field_desc(type, container, item)
  47
  48 #undef __array
  49 #define __array(type, item, size)       type    item[size];
  50
  51 #undef __array_desc
  52 #define __array_desc(type, container, item, size)
  53
  54 #undef __dynamic_array
  55 #define __dynamic_array(type, item)     type    item[];
  56
  57 #undef F_STRUCT
  58 #define F_STRUCT(args...)               args
  59
  60 #undef FTRACE_ENTRY
  61 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
  62         struct struct_name {                                    \
  63                 struct trace_entry      ent;                    \
  64                 tstruct                                         \
  65         }
  66
  67 #undef TP_ARGS
  68 #define TP_ARGS(args...)        args
  69
  70 #undef FTRACE_ENTRY_DUP
  71 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
  72
  73 #include "trace_entries.h"
  74
  75 /*
  76  * syscalls are special, and need special handling, this is why
  77  * they are not included in trace_entries.h
  78  */
  79 struct syscall_trace_enter {
  80         struct trace_entry      ent;
  81         int                     nr;
  82         unsigned long           args[];
  83 };
  84
  85 struct syscall_trace_exit {
  86         struct trace_entry      ent;
  87         int                     nr;
  88         long                    ret;
  89 };
  90
  91 struct kprobe_trace_entry_head {
  92         struct trace_entry      ent;
  93         unsigned long           ip;
  94 };
  95
  96 struct kretprobe_trace_entry_head {
  97         struct trace_entry      ent;
  98         unsigned long           func;
  99         unsigned long           ret_ip;
 100 };
 101
 102 /*
 103  * trace_flag_type is an enumeration that holds different
 104  * states when a trace occurs. These are:
 105  *  IRQS_OFF            - interrupts were disabled
 106  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 107  *  NEED_RESCHED        - reschedule is requested
 108  *  HARDIRQ             - inside an interrupt handler
 109  *  SOFTIRQ             - inside a softirq handler
 110  */
 111 enum trace_flag_type {
 112         TRACE_FLAG_IRQS_OFF             = 0x01,
 113         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 114         TRACE_FLAG_NEED_RESCHED         = 0x04,
 115         TRACE_FLAG_HARDIRQ              = 0x08,
 116         TRACE_FLAG_SOFTIRQ              = 0x10,
 117 };
 118
 119 #define TRACE_BUF_SIZE          1024
 120
 121 /*
 122  * The CPU trace array - it consists of thousands of trace entries
 123  * plus some other descriptor data: (for example which task started
 124  * the trace, etc.)
 125  */
 126 struct trace_array_cpu {
 127         atomic_t                disabled;
 128         void                    *buffer_page;   /* ring buffer spare */
 129
 130         unsigned long           saved_latency;
 131         unsigned long           critical_start;
 132         unsigned long           critical_end;
 133         unsigned long           critical_sequence;
 134         unsigned long           nice;
 135         unsigned long           policy;
 136         unsigned long           rt_priority;
 137         unsigned long           skipped_entries;
 138         cycle_t                 preempt_timestamp;
 139         pid_t                   pid;
 140         uid_t                   uid;
 141         char                    comm[TASK_COMM_LEN];
 142 };
 143
 144 /*
 145  * The trace array - an array of per-CPU trace arrays. This is the
 146  * highest level data structure that individual tracers deal with.
 147  * They have on/off state as well:
 148  */
 149 struct trace_array {
 150         struct ring_buffer      *buffer;
 151         unsigned long           entries;
 152         int                     cpu;
 153         cycle_t                 time_start;
 154         struct task_struct      *waiter;
 155         struct trace_array_cpu  *data[NR_CPUS];
 156 };
 157
 158 #define FTRACE_CMP_TYPE(var, type) \
 159         __builtin_types_compatible_p(typeof(var), type *)
 160
 161 #undef IF_ASSIGN
 162 #define IF_ASSIGN(var, entry, etype, id)                \
 163         if (FTRACE_CMP_TYPE(var, etype)) {              \
 164                 var = (typeof(var))(entry);             \
 165                 WARN_ON(id && (entry)->type != id);     \
 166                 break;                                  \
 167         }
 168
 169 /* Will cause compile errors if type is not found. */
 170 extern void __ftrace_bad_type(void);
 171
 172 /*
 173  * The trace_assign_type is a verifier that the entry type is
 174  * the same as the type being assigned. To add new types simply
 175  * add a line with the following format:
 176  *
 177  * IF_ASSIGN(var, ent, type, id);
 178  *
 179  *  Where "type" is the trace type that includes the trace_entry
 180  *  as the "ent" item. And "id" is the trace identifier that is
 181  *  used in the trace_type enum.
 182  *
 183  *  If the type can have more than one id, then use zero.
 184  */
 185 #define trace_assign_type(var, ent)                                     \
 186         do {                                                            \
 187                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 188                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 189                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 190                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 191                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 192                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 193                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
 194                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 195                           TRACE_MMIO_RW);                               \
 196                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 197                           TRACE_MMIO_MAP);                              \
 198                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 199                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 200                           TRACE_GRAPH_ENT);             \
 201                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 202                           TRACE_GRAPH_RET);             \
 203                 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
 204                 __ftrace_bad_type();                                    \
 205         } while (0)
 206
 207 /*
 208  * An option specific to a tracer. This is a boolean value.
 209  * The bit is the bit index that sets its value on the
 210  * flags value in struct tracer_flags.
 211  */
 212 struct tracer_opt {
 213         const char      *name; /* Will appear on the trace_options file */
 214         u32             bit; /* Mask assigned in val field in tracer_flags */
 215 };
 216
 217 /*
 218  * The set of specific options for a tracer. Your tracer
 219  * have to set the initial value of the flags val.
 220  */
 221 struct tracer_flags {
 222         u32                     val;
 223         struct tracer_opt       *opts;
 224 };
 225
 226 /* Makes more easy to define a tracer opt */
 227 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 228
 229
 230 /**
 231  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 232  * @name: the name chosen to select it on the available_tracers file
 233  * @init: called when one switches to this tracer (echo name > current_tracer)
 234  * @reset: called when one switches to another tracer
 235  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 236  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 237  * @open: called when the trace file is opened
 238  * @pipe_open: called when the trace_pipe file is opened
 239  * @wait_pipe: override how the user waits for traces on trace_pipe
 240  * @close: called when the trace file is released
 241  * @pipe_close: called when the trace_pipe file is released
 242  * @read: override the default read callback on trace_pipe
 243  * @splice_read: override the default splice_read callback on trace_pipe
 244  * @selftest: selftest to run on boot (see trace_selftest.c)
 245  * @print_headers: override the first lines that describe your columns
 246  * @print_line: callback that prints a trace
 247  * @set_flag: signals one of your private flags changed (trace_options file)
 248  * @flags: your private flags
 249  */
 250 struct tracer {
 251         const char              *name;
 252         int                     (*init)(struct trace_array *tr);
 253         void                    (*reset)(struct trace_array *tr);
 254         void                    (*start)(struct trace_array *tr);
 255         void                    (*stop)(struct trace_array *tr);
 256         void                    (*open)(struct trace_iterator *iter);
 257         void                    (*pipe_open)(struct trace_iterator *iter);
 258         void                    (*wait_pipe)(struct trace_iterator *iter);
 259         void                    (*close)(struct trace_iterator *iter);
 260         void                    (*pipe_close)(struct trace_iterator *iter);
 261         ssize_t                 (*read)(struct trace_iterator *iter,
 262                                         struct file *filp, char __user *ubuf,
 263                                         size_t cnt, loff_t *ppos);
 264         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 265                                                struct file *filp,
 266                                                loff_t *ppos,
 267                                                struct pipe_inode_info *pipe,
 268                                                size_t len,
 269                                                unsigned int flags);
 270 #ifdef CONFIG_FTRACE_STARTUP_TEST
 271         int                     (*selftest)(struct tracer *trace,
 272                                             struct trace_array *tr);
 273 #endif
 274         void                    (*print_header)(struct seq_file *m);
 275         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 276         /* If you handled the flag setting, return 0 */
 277         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 278         struct tracer           *next;
 279         int                     print_max;
 280         struct tracer_flags     *flags;
 281 };
 282
 283
 284 #define TRACE_PIPE_ALL_CPU      -1
 285
 286 int tracer_init(struct tracer *t, struct trace_array *tr);
 287 int tracing_is_enabled(void);
 288 void trace_wake_up(void);
 289 void tracing_reset(struct trace_array *tr, int cpu);
 290 void tracing_reset_online_cpus(struct trace_array *tr);
 291 void tracing_reset_current(int cpu);
 292 void tracing_reset_current_online_cpus(void);
 293 int tracing_open_generic(struct inode *inode, struct file *filp);
 294 struct dentry *trace_create_file(const char *name,
 295                                  mode_t mode,
 296                                  struct dentry *parent,
 297                                  void *data,
 298                                  const struct file_operations *fops);
 299
 300 struct dentry *tracing_init_dentry(void);
 301 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 302
 303 struct ring_buffer_event;
 304
 305 struct ring_buffer_event *
 306 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 307                           int type,
 308                           unsigned long len,
 309                           unsigned long flags,
 310                           int pc);
 311 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 312                                 struct ring_buffer_event *event,
 313                                 unsigned long flags, int pc);
 314
 315 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 316                                                 struct trace_array_cpu *data);
 317
 318 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 319                                           int *ent_cpu, u64 *ent_ts);
 320
 321 void default_wait_pipe(struct trace_iterator *iter);
 322 void poll_wait_pipe(struct trace_iterator *iter);
 323
 324 void ftrace(struct trace_array *tr,
 325                             struct trace_array_cpu *data,
 326                             unsigned long ip,
 327                             unsigned long parent_ip,
 328                             unsigned long flags, int pc);
 329 void tracing_sched_switch_trace(struct trace_array *tr,
 330                                 struct task_struct *prev,
 331                                 struct task_struct *next,
 332                                 unsigned long flags, int pc);
 333
 334 void tracing_sched_wakeup_trace(struct trace_array *tr,
 335                                 struct task_struct *wakee,
 336                                 struct task_struct *cur,
 337                                 unsigned long flags, int pc);
 338 void trace_special(struct trace_array *tr,
 339                    struct trace_array_cpu *data,
 340                    unsigned long arg1,
 341                    unsigned long arg2,
 342                    unsigned long arg3, int pc);
 343 void trace_function(struct trace_array *tr,
 344                     unsigned long ip,
 345                     unsigned long parent_ip,
 346                     unsigned long flags, int pc);
 347 void trace_default_header(struct seq_file *m);
 348 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 349 int trace_empty(struct trace_iterator *iter);
 350
 351 void trace_graph_return(struct ftrace_graph_ret *trace);
 352 int trace_graph_entry(struct ftrace_graph_ent *trace);
 353 void set_graph_array(struct trace_array *tr);
 354
 355 void tracing_start_cmdline_record(void);
 356 void tracing_stop_cmdline_record(void);
 357 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 358 void tracing_stop_sched_switch_record(void);
 359 void tracing_start_sched_switch_record(void);
 360 int register_tracer(struct tracer *type);
 361 void unregister_tracer(struct tracer *type);
 362 int is_tracing_stopped(void);
 363
 364 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
 365
 366 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 367
 368 extern unsigned long tracing_thresh;
 369
 370 #ifdef CONFIG_TRACER_MAX_TRACE
 371 extern unsigned long tracing_max_latency;
 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 ring_buffer *buffer,
 389                                       unsigned long flags, int skip, int pc)
 390 {
 391 }
 392
 393 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 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(int, 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_ksym(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
 462 /* Flag options */
 463 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 464 #define TRACE_GRAPH_PRINT_CPU           0x2
 465 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 466 #define TRACE_GRAPH_PRINT_PROC          0x8
 467 #define TRACE_GRAPH_PRINT_DURATION      0x10
 468 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 469
 470 extern enum print_line_t
 471 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 472 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 473 extern enum print_line_t
 474 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 475 extern void graph_trace_open(struct trace_iterator *iter);
 476 extern void graph_trace_close(struct trace_iterator *iter);
 477 extern int __trace_graph_entry(struct trace_array *tr,
 478                                struct ftrace_graph_ent *trace,
 479                                unsigned long flags, int pc);
 480 extern void __trace_graph_return(struct trace_array *tr,
 481                                  struct ftrace_graph_ret *trace,
 482                                  unsigned long flags, int pc);
 483
 484
 485 #ifdef CONFIG_DYNAMIC_FTRACE
 486 /* TODO: make this variable */
 487 #define FTRACE_GRAPH_MAX_FUNCS          32
 488 extern int ftrace_graph_filter_enabled;
 489 extern int ftrace_graph_count;
 490 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 491
 492 static inline int ftrace_graph_addr(unsigned long addr)
 493 {
 494         int i;
 495
 496         if (!ftrace_graph_filter_enabled)
 497                 return 1;
 498
 499         for (i = 0; i < ftrace_graph_count; i++) {
 500                 if (addr == ftrace_graph_funcs[i])
 501                         return 1;
 502         }
 503
 504         return 0;
 505 }
 506 #else
 507 static inline int ftrace_graph_addr(unsigned long addr)
 508 {
 509         return 1;
 510 }
 511 #endif /* CONFIG_DYNAMIC_FTRACE */
 512 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 513 static inline enum print_line_t
 514 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 515 {
 516         return TRACE_TYPE_UNHANDLED;
 517 }
 518 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 519
 520 extern struct list_head ftrace_pids;
 521
 522 #ifdef CONFIG_FUNCTION_TRACER
 523 static inline int ftrace_trace_task(struct task_struct *task)
 524 {
 525         if (list_empty(&ftrace_pids))
 526                 return 1;
 527
 528         return test_tsk_trace_trace(task);
 529 }
 530 #else
 531 static inline int ftrace_trace_task(struct task_struct *task)
 532 {
 533         return 1;
 534 }
 535 #endif
 536
 537 /*
 538  * struct trace_parser - servers for reading the user input separated by spaces
 539  * @cont: set if the input is not complete - no final space char was found
 540  * @buffer: holds the parsed user input
 541  * @idx: user input length
 542  * @size: buffer size
 543  */
 544 struct trace_parser {
 545         bool            cont;
 546         char            *buffer;
 547         unsigned        idx;
 548         unsigned        size;
 549 };
 550
 551 static inline bool trace_parser_loaded(struct trace_parser *parser)
 552 {
 553         return (parser->idx != 0);
 554 }
 555
 556 static inline bool trace_parser_cont(struct trace_parser *parser)
 557 {
 558         return parser->cont;
 559 }
 560
 561 static inline void trace_parser_clear(struct trace_parser *parser)
 562 {
 563         parser->cont = false;
 564         parser->idx = 0;
 565 }
 566
 567 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 568 extern void trace_parser_put(struct trace_parser *parser);
 569 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 570         size_t cnt, loff_t *ppos);
 571
 572 /*
 573  * trace_iterator_flags is an enumeration that defines bit
 574  * positions into trace_flags that controls the output.
 575  *
 576  * NOTE: These bits must match the trace_options array in
 577  *       trace.c.
 578  */
 579 enum trace_iterator_flags {
 580         TRACE_ITER_PRINT_PARENT         = 0x01,
 581         TRACE_ITER_SYM_OFFSET           = 0x02,
 582         TRACE_ITER_SYM_ADDR             = 0x04,
 583         TRACE_ITER_VERBOSE              = 0x08,
 584         TRACE_ITER_RAW                  = 0x10,
 585         TRACE_ITER_HEX                  = 0x20,
 586         TRACE_ITER_BIN                  = 0x40,
 587         TRACE_ITER_BLOCK                = 0x80,
 588         TRACE_ITER_STACKTRACE           = 0x100,
 589         TRACE_ITER_PRINTK               = 0x200,
 590         TRACE_ITER_PREEMPTONLY          = 0x400,
 591         TRACE_ITER_BRANCH               = 0x800,
 592         TRACE_ITER_ANNOTATE             = 0x1000,
 593         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 594         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 595         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 596         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 597         TRACE_ITER_LATENCY_FMT          = 0x20000,
 598         TRACE_ITER_SLEEP_TIME           = 0x40000,
 599         TRACE_ITER_GRAPH_TIME           = 0x80000,
 600 };
 601
 602 /*
 603  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 604  * control the output of kernel symbols.
 605  */
 606 #define TRACE_ITER_SYM_MASK \
 607         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 608
 609 extern struct tracer nop_trace;
 610
 611 #ifdef CONFIG_BRANCH_TRACER
 612 extern int enable_branch_tracing(struct trace_array *tr);
 613 extern void disable_branch_tracing(void);
 614 static inline int trace_branch_enable(struct trace_array *tr)
 615 {
 616         if (trace_flags & TRACE_ITER_BRANCH)
 617                 return enable_branch_tracing(tr);
 618         return 0;
 619 }
 620 static inline void trace_branch_disable(void)
 621 {
 622         /* due to races, always disable */
 623         disable_branch_tracing();
 624 }
 625 #else
 626 static inline int trace_branch_enable(struct trace_array *tr)
 627 {
 628         return 0;
 629 }
 630 static inline void trace_branch_disable(void)
 631 {
 632 }
 633 #endif /* CONFIG_BRANCH_TRACER */
 634
 635 /* set ring buffers to default size if not already done so */
 636 int tracing_update_buffers(void);
 637
 638 /* trace event type bit fields, not numeric */
 639 enum {
 640         TRACE_EVENT_TYPE_PRINTF         = 1,
 641         TRACE_EVENT_TYPE_RAW            = 2,
 642 };
 643
 644 struct ftrace_event_field {
 645         struct list_head        link;
 646         char                    *name;
 647         char                    *type;
 648         int                     filter_type;
 649         int                     offset;
 650         int                     size;
 651         int                     is_signed;
 652 };
 653
 654 struct event_filter {
 655         int                     n_preds;
 656         struct filter_pred      **preds;
 657         char                    *filter_string;
 658 };
 659
 660 struct event_subsystem {
 661         struct list_head        list;
 662         const char              *name;
 663         struct dentry           *entry;
 664         struct event_filter     *filter;
 665         int                     nr_events;
 666 };
 667
 668 struct filter_pred;
 669 struct regex;
 670
 671 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
 672                                  int val1, int val2);
 673
 674 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 675
 676 enum regex_type {
 677         MATCH_FULL = 0,
 678         MATCH_FRONT_ONLY,
 679         MATCH_MIDDLE_ONLY,
 680         MATCH_END_ONLY,
 681 };
 682
 683 struct regex {
 684         char                    pattern[MAX_FILTER_STR_VAL];
 685         int                     len;
 686         int                     field_len;
 687         regex_match_func        match;
 688 };
 689
 690 struct filter_pred {
 691         filter_pred_fn_t        fn;
 692         u64                     val;
 693         struct regex            regex;
 694         char                    *field_name;
 695         int                     offset;
 696         int                     not;
 697         int                     op;
 698         int                     pop_n;
 699 };
 700
 701 extern enum regex_type
 702 filter_parse_regex(char *buff, int len, char **search, int *not);
 703 extern void print_event_filter(struct ftrace_event_call *call,
 704                                struct trace_seq *s);
 705 extern int apply_event_filter(struct ftrace_event_call *call,
 706                               char *filter_string);
 707 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 708                                         char *filter_string);
 709 extern void print_subsystem_event_filter(struct event_subsystem *system,
 710                                          struct trace_seq *s);
 711 extern int filter_assign_type(const char *type);
 712
 713 struct list_head *
 714 trace_get_fields(struct ftrace_event_call *event_call);
 715
 716 static inline int
 717 filter_check_discard(struct ftrace_event_call *call, void *rec,
 718                      struct ring_buffer *buffer,
 719                      struct ring_buffer_event *event)
 720 {
 721         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 722             !filter_match_preds(call->filter, rec)) {
 723                 ring_buffer_discard_commit(buffer, event);
 724                 return 1;
 725         }
 726
 727         return 0;
 728 }
 729
 730 extern struct mutex event_mutex;
 731 extern struct list_head ftrace_events;
 732
 733 extern const char *__start___trace_bprintk_fmt[];
 734 extern const char *__stop___trace_bprintk_fmt[];
 735
 736 #undef FTRACE_ENTRY
 737 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
 738         extern struct ftrace_event_call                                 \
 739         __attribute__((__aligned__(4))) event_##call;
 740 #undef FTRACE_ENTRY_DUP
 741 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
 742         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
 743 #include "trace_entries.h"
 744
 745 #endif /* _LINUX_KERNEL_TRACE_H */