kernel/trace/trace.h

   1 #ifndef _LINUX_KERNEL_TRACE_H
   2 #define _LINUX_KERNEL_TRACE_H
   3
   4 #include <linux/fs.h>
   5 #include <linux/atomic.h>
   6 #include <linux/sched.h>
   7 #include <linux/clocksource.h>
   8 #include <linux/ring_buffer.h>
   9 #include <linux/mmiotrace.h>
  10 #include <linux/tracepoint.h>
  11 #include <linux/ftrace.h>
  12 #include <linux/hw_breakpoint.h>
  13 #include <linux/trace_seq.h>
  14 #include <linux/ftrace_event.h>
  15
  16 enum trace_type {
  17         __TRACE_FIRST_TYPE = 0,
  18
  19         TRACE_FN,
  20         TRACE_CTX,
  21         TRACE_WAKE,
  22         TRACE_STACK,
  23         TRACE_PRINT,
  24         TRACE_BPRINT,
  25         TRACE_MMIO_RW,
  26         TRACE_MMIO_MAP,
  27         TRACE_BRANCH,
  28         TRACE_GRAPH_RET,
  29         TRACE_GRAPH_ENT,
  30         TRACE_USER_STACK,
  31         TRACE_BLK,
  32
  33         __TRACE_LAST_TYPE,
  34 };
  35
  36
  37 #undef __field
  38 #define __field(type, item)             type    item;
  39
  40 #undef __field_struct
  41 #define __field_struct(type, item)      __field(type, item)
  42
  43 #undef __field_desc
  44 #define __field_desc(type, container, item)
  45
  46 #undef __array
  47 #define __array(type, item, size)       type    item[size];
  48
  49 #undef __array_desc
  50 #define __array_desc(type, container, item, size)
  51
  52 #undef __dynamic_array
  53 #define __dynamic_array(type, item)     type    item[];
  54
  55 #undef F_STRUCT
  56 #define F_STRUCT(args...)               args
  57
  58 #undef FTRACE_ENTRY
  59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
  60         struct struct_name {                                            \
  61                 struct trace_entry      ent;                            \
  62                 tstruct                                                 \
  63         }
  64
  65 #undef TP_ARGS
  66 #define TP_ARGS(args...)        args
  67
  68 #undef FTRACE_ENTRY_DUP
  69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
  70
  71 #undef FTRACE_ENTRY_REG
  72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
  73                          filter, regfn) \
  74         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
  75                      filter)
  76
  77 #include "trace_entries.h"
  78
  79 /*
  80  * syscalls are special, and need special handling, this is why
  81  * they are not included in trace_entries.h
  82  */
  83 struct syscall_trace_enter {
  84         struct trace_entry      ent;
  85         int                     nr;
  86         unsigned long           args[];
  87 };
  88
  89 struct syscall_trace_exit {
  90         struct trace_entry      ent;
  91         int                     nr;
  92         long                    ret;
  93 };
  94
  95 struct kprobe_trace_entry_head {
  96         struct trace_entry      ent;
  97         unsigned long           ip;
  98 };
  99
 100 struct kretprobe_trace_entry_head {
 101         struct trace_entry      ent;
 102         unsigned long           func;
 103         unsigned long           ret_ip;
 104 };
 105
 106 /*
 107  * trace_flag_type is an enumeration that holds different
 108  * states when a trace occurs. These are:
 109  *  IRQS_OFF            - interrupts were disabled
 110  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 111  *  NEED_RESCHED        - reschedule is requested
 112  *  HARDIRQ             - inside an interrupt handler
 113  *  SOFTIRQ             - inside a softirq handler
 114  */
 115 enum trace_flag_type {
 116         TRACE_FLAG_IRQS_OFF             = 0x01,
 117         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 118         TRACE_FLAG_NEED_RESCHED         = 0x04,
 119         TRACE_FLAG_HARDIRQ              = 0x08,
 120         TRACE_FLAG_SOFTIRQ              = 0x10,
 121 };
 122
 123 #define TRACE_BUF_SIZE          1024
 124
 125 /*
 126  * The CPU trace array - it consists of thousands of trace entries
 127  * plus some other descriptor data: (for example which task started
 128  * the trace, etc.)
 129  */
 130 struct trace_array_cpu {
 131         atomic_t                disabled;
 132         void                    *buffer_page;   /* ring buffer spare */
 133
 134         unsigned long           saved_latency;
 135         unsigned long           critical_start;
 136         unsigned long           critical_end;
 137         unsigned long           critical_sequence;
 138         unsigned long           nice;
 139         unsigned long           policy;
 140         unsigned long           rt_priority;
 141         unsigned long           skipped_entries;
 142         cycle_t                 preempt_timestamp;
 143         pid_t                   pid;
 144         uid_t                   uid;
 145         char                    comm[TASK_COMM_LEN];
 146 };
 147
 148 /*
 149  * The trace array - an array of per-CPU trace arrays. This is the
 150  * highest level data structure that individual tracers deal with.
 151  * They have on/off state as well:
 152  */
 153 struct trace_array {
 154         struct ring_buffer      *buffer;
 155         unsigned long           entries;
 156         int                     cpu;
 157         cycle_t                 time_start;
 158         struct task_struct      *waiter;
 159         struct trace_array_cpu  *data[NR_CPUS];
 160 };
 161
 162 #define FTRACE_CMP_TYPE(var, type) \
 163         __builtin_types_compatible_p(typeof(var), type *)
 164
 165 #undef IF_ASSIGN
 166 #define IF_ASSIGN(var, entry, etype, id)                \
 167         if (FTRACE_CMP_TYPE(var, etype)) {              \
 168                 var = (typeof(var))(entry);             \
 169                 WARN_ON(id && (entry)->type != id);     \
 170                 break;                                  \
 171         }
 172
 173 /* Will cause compile errors if type is not found. */
 174 extern void __ftrace_bad_type(void);
 175
 176 /*
 177  * The trace_assign_type is a verifier that the entry type is
 178  * the same as the type being assigned. To add new types simply
 179  * add a line with the following format:
 180  *
 181  * IF_ASSIGN(var, ent, type, id);
 182  *
 183  *  Where "type" is the trace type that includes the trace_entry
 184  *  as the "ent" item. And "id" is the trace identifier that is
 185  *  used in the trace_type enum.
 186  *
 187  *  If the type can have more than one id, then use zero.
 188  */
 189 #define trace_assign_type(var, ent)                                     \
 190         do {                                                            \
 191                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 192                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 193                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 194                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 195                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 196                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 197                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 198                           TRACE_MMIO_RW);                               \
 199                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 200                           TRACE_MMIO_MAP);                              \
 201                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 202                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 203                           TRACE_GRAPH_ENT);             \
 204                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 205                           TRACE_GRAPH_RET);             \
 206                 __ftrace_bad_type();                                    \
 207         } while (0)
 208
 209 /*
 210  * An option specific to a tracer. This is a boolean value.
 211  * The bit is the bit index that sets its value on the
 212  * flags value in struct tracer_flags.
 213  */
 214 struct tracer_opt {
 215         const char      *name; /* Will appear on the trace_options file */
 216         u32             bit; /* Mask assigned in val field in tracer_flags */
 217 };
 218
 219 /*
 220  * The set of specific options for a tracer. Your tracer
 221  * have to set the initial value of the flags val.
 222  */
 223 struct tracer_flags {
 224         u32                     val;
 225         struct tracer_opt       *opts;
 226 };
 227
 228 /* Makes more easy to define a tracer opt */
 229 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 230
 231
 232 /**
 233  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 234  * @name: the name chosen to select it on the available_tracers file
 235  * @init: called when one switches to this tracer (echo name > current_tracer)
 236  * @reset: called when one switches to another tracer
 237  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 238  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 239  * @open: called when the trace file is opened
 240  * @pipe_open: called when the trace_pipe file is opened
 241  * @wait_pipe: override how the user waits for traces on trace_pipe
 242  * @close: called when the trace file is released
 243  * @pipe_close: called when the trace_pipe file is released
 244  * @read: override the default read callback on trace_pipe
 245  * @splice_read: override the default splice_read callback on trace_pipe
 246  * @selftest: selftest to run on boot (see trace_selftest.c)
 247  * @print_headers: override the first lines that describe your columns
 248  * @print_line: callback that prints a trace
 249  * @set_flag: signals one of your private flags changed (trace_options file)
 250  * @flags: your private flags
 251  */
 252 struct tracer {
 253         const char              *name;
 254         int                     (*init)(struct trace_array *tr);
 255         void                    (*reset)(struct trace_array *tr);
 256         void                    (*start)(struct trace_array *tr);
 257         void                    (*stop)(struct trace_array *tr);
 258         void                    (*open)(struct trace_iterator *iter);
 259         void                    (*pipe_open)(struct trace_iterator *iter);
 260         void                    (*wait_pipe)(struct trace_iterator *iter);
 261         void                    (*close)(struct trace_iterator *iter);
 262         void                    (*pipe_close)(struct trace_iterator *iter);
 263         ssize_t                 (*read)(struct trace_iterator *iter,
 264                                         struct file *filp, char __user *ubuf,
 265                                         size_t cnt, loff_t *ppos);
 266         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 267                                                struct file *filp,
 268                                                loff_t *ppos,
 269                                                struct pipe_inode_info *pipe,
 270                                                size_t len,
 271                                                unsigned int flags);
 272 #ifdef CONFIG_FTRACE_STARTUP_TEST
 273         int                     (*selftest)(struct tracer *trace,
 274                                             struct trace_array *tr);
 275 #endif
 276         void                    (*print_header)(struct seq_file *m);
 277         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 278         /* If you handled the flag setting, return 0 */
 279         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 280         struct tracer           *next;
 281         struct tracer_flags     *flags;
 282         int                     print_max;
 283         int                     use_max_tr;
 284 };
 285
 286
 287 /* Only current can touch trace_recursion */
 288 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
 289 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
 290
 291 /* Ring buffer has the 10 LSB bits to count */
 292 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
 293
 294 /* for function tracing recursion */
 295 #define TRACE_INTERNAL_BIT              (1<<11)
 296 #define TRACE_GLOBAL_BIT                (1<<12)
 297 #define TRACE_CONTROL_BIT               (1<<13)
 298
 299 /*
 300  * Abuse of the trace_recursion.
 301  * As we need a way to maintain state if we are tracing the function
 302  * graph in irq because we want to trace a particular function that
 303  * was called in irq context but we have irq tracing off. Since this
 304  * can only be modified by current, we can reuse trace_recursion.
 305  */
 306 #define TRACE_IRQ_BIT                   (1<<13)
 307
 308 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (bit); } while (0)
 309 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(bit); } while (0)
 310 #define trace_recursion_test(bit)       ((current)->trace_recursion & (bit))
 311
 312 #define TRACE_PIPE_ALL_CPU      -1
 313
 314 int tracer_init(struct tracer *t, struct trace_array *tr);
 315 int tracing_is_enabled(void);
 316 void trace_wake_up(void);
 317 void tracing_reset(struct trace_array *tr, int cpu);
 318 void tracing_reset_online_cpus(struct trace_array *tr);
 319 void tracing_reset_current(int cpu);
 320 void tracing_reset_current_online_cpus(void);
 321 int tracing_open_generic(struct inode *inode, struct file *filp);
 322 struct dentry *trace_create_file(const char *name,
 323                                  umode_t mode,
 324                                  struct dentry *parent,
 325                                  void *data,
 326                                  const struct file_operations *fops);
 327
 328 struct dentry *tracing_init_dentry(void);
 329
 330 struct ring_buffer_event;
 331
 332 struct ring_buffer_event *
 333 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 334                           int type,
 335                           unsigned long len,
 336                           unsigned long flags,
 337                           int pc);
 338 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 339                                 struct ring_buffer_event *event,
 340                                 unsigned long flags, int pc);
 341
 342 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 343                                                 struct trace_array_cpu *data);
 344
 345 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 346                                           int *ent_cpu, u64 *ent_ts);
 347
 348 int trace_empty(struct trace_iterator *iter);
 349
 350 void *trace_find_next_entry_inc(struct trace_iterator *iter);
 351
 352 void trace_init_global_iter(struct trace_iterator *iter);
 353
 354 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 355
 356 void default_wait_pipe(struct trace_iterator *iter);
 357 void poll_wait_pipe(struct trace_iterator *iter);
 358
 359 void ftrace(struct trace_array *tr,
 360                             struct trace_array_cpu *data,
 361                             unsigned long ip,
 362                             unsigned long parent_ip,
 363                             unsigned long flags, int pc);
 364 void tracing_sched_switch_trace(struct trace_array *tr,
 365                                 struct task_struct *prev,
 366                                 struct task_struct *next,
 367                                 unsigned long flags, int pc);
 368
 369 void tracing_sched_wakeup_trace(struct trace_array *tr,
 370                                 struct task_struct *wakee,
 371                                 struct task_struct *cur,
 372                                 unsigned long flags, int pc);
 373 void trace_function(struct trace_array *tr,
 374                     unsigned long ip,
 375                     unsigned long parent_ip,
 376                     unsigned long flags, int pc);
 377 void trace_graph_function(struct trace_array *tr,
 378                     unsigned long ip,
 379                     unsigned long parent_ip,
 380                     unsigned long flags, int pc);
 381 void trace_latency_header(struct seq_file *m);
 382 void trace_default_header(struct seq_file *m);
 383 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 384 int trace_empty(struct trace_iterator *iter);
 385
 386 void trace_graph_return(struct ftrace_graph_ret *trace);
 387 int trace_graph_entry(struct ftrace_graph_ent *trace);
 388 void set_graph_array(struct trace_array *tr);
 389
 390 void tracing_start_cmdline_record(void);
 391 void tracing_stop_cmdline_record(void);
 392 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 393 void tracing_stop_sched_switch_record(void);
 394 void tracing_start_sched_switch_record(void);
 395 int register_tracer(struct tracer *type);
 396 void unregister_tracer(struct tracer *type);
 397 int is_tracing_stopped(void);
 398 enum trace_file_type {
 399         TRACE_FILE_LAT_FMT      = 1,
 400         TRACE_FILE_ANNOTATE     = 2,
 401 };
 402
 403 extern cpumask_var_t __read_mostly tracing_buffer_mask;
 404
 405 #define for_each_tracing_cpu(cpu)       \
 406         for_each_cpu(cpu, tracing_buffer_mask)
 407
 408 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 409
 410 extern unsigned long tracing_thresh;
 411
 412 #ifdef CONFIG_TRACER_MAX_TRACE
 413 extern unsigned long tracing_max_latency;
 414
 415 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 416 void update_max_tr_single(struct trace_array *tr,
 417                           struct task_struct *tsk, int cpu);
 418 #endif /* CONFIG_TRACER_MAX_TRACE */
 419
 420 #ifdef CONFIG_STACKTRACE
 421 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 422                         int skip, int pc);
 423
 424 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
 425                              int skip, int pc, struct pt_regs *regs);
 426
 427 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 428                             int pc);
 429
 430 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 431                    int pc);
 432 #else
 433 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 434                                       unsigned long flags, int skip, int pc)
 435 {
 436 }
 437
 438 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
 439                                            unsigned long flags, int skip,
 440                                            int pc, struct pt_regs *regs)
 441 {
 442 }
 443
 444 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 445                                           unsigned long flags, int pc)
 446 {
 447 }
 448
 449 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 450                                  int skip, int pc)
 451 {
 452 }
 453 #endif /* CONFIG_STACKTRACE */
 454
 455 extern cycle_t ftrace_now(int cpu);
 456
 457 extern void trace_find_cmdline(int pid, char comm[]);
 458
 459 #ifdef CONFIG_DYNAMIC_FTRACE
 460 extern unsigned long ftrace_update_tot_cnt;
 461 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 462 extern int DYN_FTRACE_TEST_NAME(void);
 463 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
 464 extern int DYN_FTRACE_TEST_NAME2(void);
 465 #endif
 466
 467 extern int ring_buffer_expanded;
 468 extern bool tracing_selftest_disabled;
 469 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 470
 471 #ifdef CONFIG_FTRACE_STARTUP_TEST
 472 extern int trace_selftest_startup_function(struct tracer *trace,
 473                                            struct trace_array *tr);
 474 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 475                                                  struct trace_array *tr);
 476 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 477                                           struct trace_array *tr);
 478 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 479                                              struct trace_array *tr);
 480 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 481                                                  struct trace_array *tr);
 482 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 483                                          struct trace_array *tr);
 484 extern int trace_selftest_startup_nop(struct tracer *trace,
 485                                          struct trace_array *tr);
 486 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 487                                                struct trace_array *tr);
 488 extern int trace_selftest_startup_branch(struct tracer *trace,
 489                                          struct trace_array *tr);
 490 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 491
 492 extern void *head_page(struct trace_array_cpu *data);
 493 extern unsigned long long ns2usecs(cycle_t nsec);
 494 extern int
 495 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 496 extern int
 497 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 498 extern int
 499 trace_array_vprintk(struct trace_array *tr,
 500                     unsigned long ip, const char *fmt, va_list args);
 501 int trace_array_printk(struct trace_array *tr,
 502                        unsigned long ip, const char *fmt, ...);
 503 void trace_printk_seq(struct trace_seq *s);
 504 enum print_line_t print_trace_line(struct trace_iterator *iter);
 505
 506 extern unsigned long trace_flags;
 507
 508 extern int trace_clock_id;
 509
 510 /* Standard output formatting function used for function return traces */
 511 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 512
 513 /* Flag options */
 514 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 515 #define TRACE_GRAPH_PRINT_CPU           0x2
 516 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 517 #define TRACE_GRAPH_PRINT_PROC          0x8
 518 #define TRACE_GRAPH_PRINT_DURATION      0x10
 519 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 520
 521 extern enum print_line_t
 522 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 523 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 524 extern enum print_line_t
 525 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 526 extern void graph_trace_open(struct trace_iterator *iter);
 527 extern void graph_trace_close(struct trace_iterator *iter);
 528 extern int __trace_graph_entry(struct trace_array *tr,
 529                                struct ftrace_graph_ent *trace,
 530                                unsigned long flags, int pc);
 531 extern void __trace_graph_return(struct trace_array *tr,
 532                                  struct ftrace_graph_ret *trace,
 533                                  unsigned long flags, int pc);
 534
 535
 536 #ifdef CONFIG_DYNAMIC_FTRACE
 537 /* TODO: make this variable */
 538 #define FTRACE_GRAPH_MAX_FUNCS          32
 539 extern int ftrace_graph_filter_enabled;
 540 extern int ftrace_graph_count;
 541 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 542
 543 static inline int ftrace_graph_addr(unsigned long addr)
 544 {
 545         int i;
 546
 547         if (!ftrace_graph_filter_enabled)
 548                 return 1;
 549
 550         for (i = 0; i < ftrace_graph_count; i++) {
 551                 if (addr == ftrace_graph_funcs[i]) {
 552                         /*
 553                          * If no irqs are to be traced, but a set_graph_function
 554                          * is set, and called by an interrupt handler, we still
 555                          * want to trace it.
 556                          */
 557                         if (in_irq())
 558                                 trace_recursion_set(TRACE_IRQ_BIT);
 559                         else
 560                                 trace_recursion_clear(TRACE_IRQ_BIT);
 561                         return 1;
 562                 }
 563         }
 564
 565         return 0;
 566 }
 567 #else
 568 static inline int ftrace_graph_addr(unsigned long addr)
 569 {
 570         return 1;
 571 }
 572 #endif /* CONFIG_DYNAMIC_FTRACE */
 573 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 574 static inline enum print_line_t
 575 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 576 {
 577         return TRACE_TYPE_UNHANDLED;
 578 }
 579 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 580
 581 extern struct list_head ftrace_pids;
 582
 583 #ifdef CONFIG_FUNCTION_TRACER
 584 static inline int ftrace_trace_task(struct task_struct *task)
 585 {
 586         if (list_empty(&ftrace_pids))
 587                 return 1;
 588
 589         return test_tsk_trace_trace(task);
 590 }
 591 extern int ftrace_is_dead(void);
 592 #else
 593 static inline int ftrace_trace_task(struct task_struct *task)
 594 {
 595         return 1;
 596 }
 597 static inline int ftrace_is_dead(void) { return 0; }
 598 #endif
 599
 600 int ftrace_event_is_function(struct ftrace_event_call *call);
 601
 602 /*
 603  * struct trace_parser - servers for reading the user input separated by spaces
 604  * @cont: set if the input is not complete - no final space char was found
 605  * @buffer: holds the parsed user input
 606  * @idx: user input length
 607  * @size: buffer size
 608  */
 609 struct trace_parser {
 610         bool            cont;
 611         char            *buffer;
 612         unsigned        idx;
 613         unsigned        size;
 614 };
 615
 616 static inline bool trace_parser_loaded(struct trace_parser *parser)
 617 {
 618         return (parser->idx != 0);
 619 }
 620
 621 static inline bool trace_parser_cont(struct trace_parser *parser)
 622 {
 623         return parser->cont;
 624 }
 625
 626 static inline void trace_parser_clear(struct trace_parser *parser)
 627 {
 628         parser->cont = false;
 629         parser->idx = 0;
 630 }
 631
 632 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 633 extern void trace_parser_put(struct trace_parser *parser);
 634 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 635         size_t cnt, loff_t *ppos);
 636
 637 /*
 638  * trace_iterator_flags is an enumeration that defines bit
 639  * positions into trace_flags that controls the output.
 640  *
 641  * NOTE: These bits must match the trace_options array in
 642  *       trace.c.
 643  */
 644 enum trace_iterator_flags {
 645         TRACE_ITER_PRINT_PARENT         = 0x01,
 646         TRACE_ITER_SYM_OFFSET           = 0x02,
 647         TRACE_ITER_SYM_ADDR             = 0x04,
 648         TRACE_ITER_VERBOSE              = 0x08,
 649         TRACE_ITER_RAW                  = 0x10,
 650         TRACE_ITER_HEX                  = 0x20,
 651         TRACE_ITER_BIN                  = 0x40,
 652         TRACE_ITER_BLOCK                = 0x80,
 653         TRACE_ITER_STACKTRACE           = 0x100,
 654         TRACE_ITER_PRINTK               = 0x200,
 655         TRACE_ITER_PREEMPTONLY          = 0x400,
 656         TRACE_ITER_BRANCH               = 0x800,
 657         TRACE_ITER_ANNOTATE             = 0x1000,
 658         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 659         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 660         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 661         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 662         TRACE_ITER_LATENCY_FMT          = 0x20000,
 663         TRACE_ITER_SLEEP_TIME           = 0x40000,
 664         TRACE_ITER_GRAPH_TIME           = 0x80000,
 665         TRACE_ITER_RECORD_CMD           = 0x100000,
 666         TRACE_ITER_OVERWRITE            = 0x200000,
 667         TRACE_ITER_STOP_ON_FREE         = 0x400000,
 668         TRACE_ITER_IRQ_INFO             = 0x800000,
 669 };
 670
 671 /*
 672  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 673  * control the output of kernel symbols.
 674  */
 675 #define TRACE_ITER_SYM_MASK \
 676         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 677
 678 extern struct tracer nop_trace;
 679
 680 #ifdef CONFIG_BRANCH_TRACER
 681 extern int enable_branch_tracing(struct trace_array *tr);
 682 extern void disable_branch_tracing(void);
 683 static inline int trace_branch_enable(struct trace_array *tr)
 684 {
 685         if (trace_flags & TRACE_ITER_BRANCH)
 686                 return enable_branch_tracing(tr);
 687         return 0;
 688 }
 689 static inline void trace_branch_disable(void)
 690 {
 691         /* due to races, always disable */
 692         disable_branch_tracing();
 693 }
 694 #else
 695 static inline int trace_branch_enable(struct trace_array *tr)
 696 {
 697         return 0;
 698 }
 699 static inline void trace_branch_disable(void)
 700 {
 701 }
 702 #endif /* CONFIG_BRANCH_TRACER */
 703
 704 /* set ring buffers to default size if not already done so */
 705 int tracing_update_buffers(void);
 706
 707 /* trace event type bit fields, not numeric */
 708 enum {
 709         TRACE_EVENT_TYPE_PRINTF         = 1,
 710         TRACE_EVENT_TYPE_RAW            = 2,
 711 };
 712
 713 struct ftrace_event_field {
 714         struct list_head        link;
 715         char                    *name;
 716         char                    *type;
 717         int                     filter_type;
 718         int                     offset;
 719         int                     size;
 720         int                     is_signed;
 721 };
 722
 723 struct event_filter {
 724         int                     n_preds;        /* Number assigned */
 725         int                     a_preds;        /* allocated */
 726         struct filter_pred      *preds;
 727         struct filter_pred      *root;
 728         char                    *filter_string;
 729 };
 730
 731 struct event_subsystem {
 732         struct list_head        list;
 733         const char              *name;
 734         struct dentry           *entry;
 735         struct event_filter     *filter;
 736         int                     nr_events;
 737         int                     ref_count;
 738 };
 739
 740 #define FILTER_PRED_INVALID     ((unsigned short)-1)
 741 #define FILTER_PRED_IS_RIGHT    (1 << 15)
 742 #define FILTER_PRED_FOLD        (1 << 15)
 743
 744 /*
 745  * The max preds is the size of unsigned short with
 746  * two flags at the MSBs. One bit is used for both the IS_RIGHT
 747  * and FOLD flags. The other is reserved.
 748  *
 749  * 2^14 preds is way more than enough.
 750  */
 751 #define MAX_FILTER_PRED         16384
 752
 753 struct filter_pred;
 754 struct regex;
 755
 756 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
 757
 758 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 759
 760 enum regex_type {
 761         MATCH_FULL = 0,
 762         MATCH_FRONT_ONLY,
 763         MATCH_MIDDLE_ONLY,
 764         MATCH_END_ONLY,
 765 };
 766
 767 struct regex {
 768         char                    pattern[MAX_FILTER_STR_VAL];
 769         int                     len;
 770         int                     field_len;
 771         regex_match_func        match;
 772 };
 773
 774 struct filter_pred {
 775         filter_pred_fn_t        fn;
 776         u64                     val;
 777         struct regex            regex;
 778         unsigned short          *ops;
 779         struct ftrace_event_field *field;
 780         int                     offset;
 781         int                     not;
 782         int                     op;
 783         unsigned short          index;
 784         unsigned short          parent;
 785         unsigned short          left;
 786         unsigned short          right;
 787 };
 788
 789 extern struct list_head ftrace_common_fields;
 790
 791 extern enum regex_type
 792 filter_parse_regex(char *buff, int len, char **search, int *not);
 793 extern void print_event_filter(struct ftrace_event_call *call,
 794                                struct trace_seq *s);
 795 extern int apply_event_filter(struct ftrace_event_call *call,
 796                               char *filter_string);
 797 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 798                                         char *filter_string);
 799 extern void print_subsystem_event_filter(struct event_subsystem *system,
 800                                          struct trace_seq *s);
 801 extern int filter_assign_type(const char *type);
 802
 803 struct list_head *
 804 trace_get_fields(struct ftrace_event_call *event_call);
 805
 806 static inline int
 807 filter_check_discard(struct ftrace_event_call *call, void *rec,
 808                      struct ring_buffer *buffer,
 809                      struct ring_buffer_event *event)
 810 {
 811         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 812             !filter_match_preds(call->filter, rec)) {
 813                 ring_buffer_discard_commit(buffer, event);
 814                 return 1;
 815         }
 816
 817         return 0;
 818 }
 819
 820 extern void trace_event_enable_cmd_record(bool enable);
 821
 822 extern struct mutex event_mutex;
 823 extern struct list_head ftrace_events;
 824
 825 extern const char *__start___trace_bprintk_fmt[];
 826 extern const char *__stop___trace_bprintk_fmt[];
 827
 828 #undef FTRACE_ENTRY
 829 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
 830         extern struct ftrace_event_call                                 \
 831         __attribute__((__aligned__(4))) event_##call;
 832 #undef FTRACE_ENTRY_DUP
 833 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
 834         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 835                      filter)
 836 #include "trace_entries.h"
 837
 838 #ifdef CONFIG_PERF_EVENTS
 839 #ifdef CONFIG_FUNCTION_TRACER
 840 int perf_ftrace_event_register(struct ftrace_event_call *call,
 841                                enum trace_reg type, void *data);
 842 #else
 843 #define perf_ftrace_event_register NULL
 844 #endif /* CONFIG_FUNCTION_TRACER */
 845 #endif /* CONFIG_PERF_EVENTS */
 846
 847 #endif /* _LINUX_KERNEL_TRACE_H */