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