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
  34         __TRACE_LAST_TYPE,
  35 };
  36
  37
  38 #undef __field
  39 #define __field(type, item)             type    item;
  40
  41 #undef __field_struct
  42 #define __field_struct(type, item)      __field(type, item)
  43
  44 #undef __field_desc
  45 #define __field_desc(type, container, item)
  46
  47 #undef __array
  48 #define __array(type, item, size)       type    item[size];
  49
  50 #undef __array_desc
  51 #define __array_desc(type, container, item, size)
  52
  53 #undef __dynamic_array
  54 #define __dynamic_array(type, item)     type    item[];
  55
  56 #undef F_STRUCT
  57 #define F_STRUCT(args...)               args
  58
  59 #undef FTRACE_ENTRY
  60 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
  61         struct struct_name {                                    \
  62                 struct trace_entry      ent;                    \
  63                 tstruct                                         \
  64         }
  65
  66 #undef TP_ARGS
  67 #define TP_ARGS(args...)        args
  68
  69 #undef FTRACE_ENTRY_DUP
  70 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
  71
  72 #include "trace_entries.h"
  73
  74 /*
  75  * syscalls are special, and need special handling, this is why
  76  * they are not included in trace_entries.h
  77  */
  78 struct syscall_trace_enter {
  79         struct trace_entry      ent;
  80         int                     nr;
  81         unsigned long           args[];
  82 };
  83
  84 struct syscall_trace_exit {
  85         struct trace_entry      ent;
  86         int                     nr;
  87         long                    ret;
  88 };
  89
  90 struct kprobe_trace_entry_head {
  91         struct trace_entry      ent;
  92         unsigned long           ip;
  93 };
  94
  95 struct kretprobe_trace_entry_head {
  96         struct trace_entry      ent;
  97         unsigned long           func;
  98         unsigned long           ret_ip;
  99 };
 100
 101 /*
 102  * trace_flag_type is an enumeration that holds different
 103  * states when a trace occurs. These are:
 104  *  IRQS_OFF            - interrupts were disabled
 105  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 106  *  NEED_RESCHED        - reschedule is requested
 107  *  HARDIRQ             - inside an interrupt handler
 108  *  SOFTIRQ             - inside a softirq handler
 109  */
 110 enum trace_flag_type {
 111         TRACE_FLAG_IRQS_OFF             = 0x01,
 112         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 113         TRACE_FLAG_NEED_RESCHED         = 0x04,
 114         TRACE_FLAG_HARDIRQ              = 0x08,
 115         TRACE_FLAG_SOFTIRQ              = 0x10,
 116 };
 117
 118 #define TRACE_BUF_SIZE          1024
 119
 120 /*
 121  * The CPU trace array - it consists of thousands of trace entries
 122  * plus some other descriptor data: (for example which task started
 123  * the trace, etc.)
 124  */
 125 struct trace_array_cpu {
 126         atomic_t                disabled;
 127         void                    *buffer_page;   /* ring buffer spare */
 128
 129         unsigned long           saved_latency;
 130         unsigned long           critical_start;
 131         unsigned long           critical_end;
 132         unsigned long           critical_sequence;
 133         unsigned long           nice;
 134         unsigned long           policy;
 135         unsigned long           rt_priority;
 136         unsigned long           skipped_entries;
 137         cycle_t                 preempt_timestamp;
 138         pid_t                   pid;
 139         uid_t                   uid;
 140         char                    comm[TASK_COMM_LEN];
 141 };
 142
 143 /*
 144  * The trace array - an array of per-CPU trace arrays. This is the
 145  * highest level data structure that individual tracers deal with.
 146  * They have on/off state as well:
 147  */
 148 struct trace_array {
 149         struct ring_buffer      *buffer;
 150         unsigned long           entries;
 151         int                     cpu;
 152         cycle_t                 time_start;
 153         struct task_struct      *waiter;
 154         struct trace_array_cpu  *data[NR_CPUS];
 155 };
 156
 157 #define FTRACE_CMP_TYPE(var, type) \
 158         __builtin_types_compatible_p(typeof(var), type *)
 159
 160 #undef IF_ASSIGN
 161 #define IF_ASSIGN(var, entry, etype, id)                \
 162         if (FTRACE_CMP_TYPE(var, etype)) {              \
 163                 var = (typeof(var))(entry);             \
 164                 WARN_ON(id && (entry)->type != id);     \
 165                 break;                                  \
 166         }
 167
 168 /* Will cause compile errors if type is not found. */
 169 extern void __ftrace_bad_type(void);
 170
 171 /*
 172  * The trace_assign_type is a verifier that the entry type is
 173  * the same as the type being assigned. To add new types simply
 174  * add a line with the following format:
 175  *
 176  * IF_ASSIGN(var, ent, type, id);
 177  *
 178  *  Where "type" is the trace type that includes the trace_entry
 179  *  as the "ent" item. And "id" is the trace identifier that is
 180  *  used in the trace_type enum.
 181  *
 182  *  If the type can have more than one id, then use zero.
 183  */
 184 #define trace_assign_type(var, ent)                                     \
 185         do {                                                            \
 186                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 187                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 188                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 189                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 190                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 191                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 192                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
 193                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 194                           TRACE_MMIO_RW);                               \
 195                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 196                           TRACE_MMIO_MAP);                              \
 197                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 198                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 199                           TRACE_GRAPH_ENT);             \
 200                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 201                           TRACE_GRAPH_RET);             \
 202                 __ftrace_bad_type();                                    \
 203         } while (0)
 204
 205 /*
 206  * An option specific to a tracer. This is a boolean value.
 207  * The bit is the bit index that sets its value on the
 208  * flags value in struct tracer_flags.
 209  */
 210 struct tracer_opt {
 211         const char      *name; /* Will appear on the trace_options file */
 212         u32             bit; /* Mask assigned in val field in tracer_flags */
 213 };
 214
 215 /*
 216  * The set of specific options for a tracer. Your tracer
 217  * have to set the initial value of the flags val.
 218  */
 219 struct tracer_flags {
 220         u32                     val;
 221         struct tracer_opt       *opts;
 222 };
 223
 224 /* Makes more easy to define a tracer opt */
 225 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 226
 227
 228 /**
 229  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 230  * @name: the name chosen to select it on the available_tracers file
 231  * @init: called when one switches to this tracer (echo name > current_tracer)
 232  * @reset: called when one switches to another tracer
 233  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 234  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 235  * @open: called when the trace file is opened
 236  * @pipe_open: called when the trace_pipe file is opened
 237  * @wait_pipe: override how the user waits for traces on trace_pipe
 238  * @close: called when the trace file is released
 239  * @pipe_close: called when the trace_pipe file is released
 240  * @read: override the default read callback on trace_pipe
 241  * @splice_read: override the default splice_read callback on trace_pipe
 242  * @selftest: selftest to run on boot (see trace_selftest.c)
 243  * @print_headers: override the first lines that describe your columns
 244  * @print_line: callback that prints a trace
 245  * @set_flag: signals one of your private flags changed (trace_options file)
 246  * @flags: your private flags
 247  */
 248 struct tracer {
 249         const char              *name;
 250         int                     (*init)(struct trace_array *tr);
 251         void                    (*reset)(struct trace_array *tr);
 252         void                    (*start)(struct trace_array *tr);
 253         void                    (*stop)(struct trace_array *tr);
 254         void                    (*open)(struct trace_iterator *iter);
 255         void                    (*pipe_open)(struct trace_iterator *iter);
 256         void                    (*wait_pipe)(struct trace_iterator *iter);
 257         void                    (*close)(struct trace_iterator *iter);
 258         void                    (*pipe_close)(struct trace_iterator *iter);
 259         ssize_t                 (*read)(struct trace_iterator *iter,
 260                                         struct file *filp, char __user *ubuf,
 261                                         size_t cnt, loff_t *ppos);
 262         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 263                                                struct file *filp,
 264                                                loff_t *ppos,
 265                                                struct pipe_inode_info *pipe,
 266                                                size_t len,
 267                                                unsigned int flags);
 268 #ifdef CONFIG_FTRACE_STARTUP_TEST
 269         int                     (*selftest)(struct tracer *trace,
 270                                             struct trace_array *tr);
 271 #endif
 272         void                    (*print_header)(struct seq_file *m);
 273         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 274         /* If you handled the flag setting, return 0 */
 275         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 276         struct tracer           *next;
 277         int                     print_max;
 278         struct tracer_flags     *flags;
 279 };
 280
 281
 282 #define TRACE_PIPE_ALL_CPU      -1
 283
 284 int tracer_init(struct tracer *t, struct trace_array *tr);
 285 int tracing_is_enabled(void);
 286 void trace_wake_up(void);
 287 void tracing_reset(struct trace_array *tr, int cpu);
 288 void tracing_reset_online_cpus(struct trace_array *tr);
 289 void tracing_reset_current(int cpu);
 290 void tracing_reset_current_online_cpus(void);
 291 int tracing_open_generic(struct inode *inode, struct file *filp);
 292 struct dentry *trace_create_file(const char *name,
 293                                  mode_t mode,
 294                                  struct dentry *parent,
 295                                  void *data,
 296                                  const struct file_operations *fops);
 297
 298 struct dentry *tracing_init_dentry(void);
 299 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 300
 301 struct ring_buffer_event;
 302
 303 struct ring_buffer_event *
 304 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 305                           int type,
 306                           unsigned long len,
 307                           unsigned long flags,
 308                           int pc);
 309 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 310                                 struct ring_buffer_event *event,
 311                                 unsigned long flags, int pc);
 312
 313 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 314                                                 struct trace_array_cpu *data);
 315
 316 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 317                                           int *ent_cpu, u64 *ent_ts);
 318
 319 void default_wait_pipe(struct trace_iterator *iter);
 320 void poll_wait_pipe(struct trace_iterator *iter);
 321
 322 void ftrace(struct trace_array *tr,
 323                             struct trace_array_cpu *data,
 324                             unsigned long ip,
 325                             unsigned long parent_ip,
 326                             unsigned long flags, int pc);
 327 void tracing_sched_switch_trace(struct trace_array *tr,
 328                                 struct task_struct *prev,
 329                                 struct task_struct *next,
 330                                 unsigned long flags, int pc);
 331
 332 void tracing_sched_wakeup_trace(struct trace_array *tr,
 333                                 struct task_struct *wakee,
 334                                 struct task_struct *cur,
 335                                 unsigned long flags, int pc);
 336 void trace_special(struct trace_array *tr,
 337                    struct trace_array_cpu *data,
 338                    unsigned long arg1,
 339                    unsigned long arg2,
 340                    unsigned long arg3, int pc);
 341 void trace_function(struct trace_array *tr,
 342                     unsigned long ip,
 343                     unsigned long parent_ip,
 344                     unsigned long flags, int pc);
 345 void trace_default_header(struct seq_file *m);
 346 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 347 int trace_empty(struct trace_iterator *iter);
 348
 349 void trace_graph_return(struct ftrace_graph_ret *trace);
 350 int trace_graph_entry(struct ftrace_graph_ent *trace);
 351 void set_graph_array(struct trace_array *tr);
 352
 353 void tracing_start_cmdline_record(void);
 354 void tracing_stop_cmdline_record(void);
 355 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 356 void tracing_stop_sched_switch_record(void);
 357 void tracing_start_sched_switch_record(void);
 358 int register_tracer(struct tracer *type);
 359 void unregister_tracer(struct tracer *type);
 360 int is_tracing_stopped(void);
 361
 362 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 363
 364 extern unsigned long tracing_thresh;
 365
 366 #ifdef CONFIG_TRACER_MAX_TRACE
 367 extern unsigned long tracing_max_latency;
 368
 369 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 370 void update_max_tr_single(struct trace_array *tr,
 371                           struct task_struct *tsk, int cpu);
 372 #endif /* CONFIG_TRACER_MAX_TRACE */
 373
 374 #ifdef CONFIG_STACKTRACE
 375 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 376                         int skip, int pc);
 377
 378 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 379                             int pc);
 380
 381 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 382                    int pc);
 383 #else
 384 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 385                                       unsigned long flags, int skip, int pc)
 386 {
 387 }
 388
 389 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 390                                           unsigned long flags, int pc)
 391 {
 392 }
 393
 394 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 395                                  int skip, int pc)
 396 {
 397 }
 398 #endif /* CONFIG_STACKTRACE */
 399
 400 extern cycle_t ftrace_now(int cpu);
 401
 402 extern void trace_find_cmdline(int pid, char comm[]);
 403
 404 #ifdef CONFIG_DYNAMIC_FTRACE
 405 extern unsigned long ftrace_update_tot_cnt;
 406 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 407 extern int DYN_FTRACE_TEST_NAME(void);
 408 #endif
 409
 410 extern int ring_buffer_expanded;
 411 extern bool tracing_selftest_disabled;
 412 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 413
 414 #ifdef CONFIG_FTRACE_STARTUP_TEST
 415 extern int trace_selftest_startup_function(struct tracer *trace,
 416                                            struct trace_array *tr);
 417 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 418                                                  struct trace_array *tr);
 419 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 420                                           struct trace_array *tr);
 421 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 422                                              struct trace_array *tr);
 423 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 424                                                  struct trace_array *tr);
 425 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 426                                          struct trace_array *tr);
 427 extern int trace_selftest_startup_nop(struct tracer *trace,
 428                                          struct trace_array *tr);
 429 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 430                                                struct trace_array *tr);
 431 extern int trace_selftest_startup_sysprof(struct tracer *trace,
 432                                                struct trace_array *tr);
 433 extern int trace_selftest_startup_branch(struct tracer *trace,
 434                                          struct trace_array *tr);
 435 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 436
 437 extern void *head_page(struct trace_array_cpu *data);
 438 extern unsigned long long ns2usecs(cycle_t nsec);
 439 extern int
 440 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 441 extern int
 442 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 443 extern int
 444 trace_array_vprintk(struct trace_array *tr,
 445                     unsigned long ip, const char *fmt, va_list args);
 446 int trace_array_printk(struct trace_array *tr,
 447                        unsigned long ip, const char *fmt, ...);
 448
 449 extern unsigned long trace_flags;
 450
 451 extern int trace_clock_id;
 452
 453 /* Standard output formatting function used for function return traces */
 454 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 455
 456 /* Flag options */
 457 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 458 #define TRACE_GRAPH_PRINT_CPU           0x2
 459 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 460 #define TRACE_GRAPH_PRINT_PROC          0x8
 461 #define TRACE_GRAPH_PRINT_DURATION      0x10
 462 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 463
 464 extern enum print_line_t
 465 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 466 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 467 extern enum print_line_t
 468 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 469 extern void graph_trace_open(struct trace_iterator *iter);
 470 extern void graph_trace_close(struct trace_iterator *iter);
 471 extern int __trace_graph_entry(struct trace_array *tr,
 472                                struct ftrace_graph_ent *trace,
 473                                unsigned long flags, int pc);
 474 extern void __trace_graph_return(struct trace_array *tr,
 475                                  struct ftrace_graph_ret *trace,
 476                                  unsigned long flags, int pc);
 477
 478
 479 #ifdef CONFIG_DYNAMIC_FTRACE
 480 /* TODO: make this variable */
 481 #define FTRACE_GRAPH_MAX_FUNCS          32
 482 extern int ftrace_graph_filter_enabled;
 483 extern int ftrace_graph_count;
 484 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 485
 486 static inline int ftrace_graph_addr(unsigned long addr)
 487 {
 488         int i;
 489
 490         if (!ftrace_graph_filter_enabled)
 491                 return 1;
 492
 493         for (i = 0; i < ftrace_graph_count; i++) {
 494                 if (addr == ftrace_graph_funcs[i])
 495                         return 1;
 496         }
 497
 498         return 0;
 499 }
 500 #else
 501 static inline int ftrace_graph_addr(unsigned long addr)
 502 {
 503         return 1;
 504 }
 505 #endif /* CONFIG_DYNAMIC_FTRACE */
 506 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 507 static inline enum print_line_t
 508 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 509 {
 510         return TRACE_TYPE_UNHANDLED;
 511 }
 512 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 513
 514 extern struct list_head ftrace_pids;
 515
 516 #ifdef CONFIG_FUNCTION_TRACER
 517 static inline int ftrace_trace_task(struct task_struct *task)
 518 {
 519         if (list_empty(&ftrace_pids))
 520                 return 1;
 521
 522         return test_tsk_trace_trace(task);
 523 }
 524 #else
 525 static inline int ftrace_trace_task(struct task_struct *task)
 526 {
 527         return 1;
 528 }
 529 #endif
 530
 531 /*
 532  * struct trace_parser - servers for reading the user input separated by spaces
 533  * @cont: set if the input is not complete - no final space char was found
 534  * @buffer: holds the parsed user input
 535  * @idx: user input length
 536  * @size: buffer size
 537  */
 538 struct trace_parser {
 539         bool            cont;
 540         char            *buffer;
 541         unsigned        idx;
 542         unsigned        size;
 543 };
 544
 545 static inline bool trace_parser_loaded(struct trace_parser *parser)
 546 {
 547         return (parser->idx != 0);
 548 }
 549
 550 static inline bool trace_parser_cont(struct trace_parser *parser)
 551 {
 552         return parser->cont;
 553 }
 554
 555 static inline void trace_parser_clear(struct trace_parser *parser)
 556 {
 557         parser->cont = false;
 558         parser->idx = 0;
 559 }
 560
 561 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 562 extern void trace_parser_put(struct trace_parser *parser);
 563 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 564         size_t cnt, loff_t *ppos);
 565
 566 /*
 567  * trace_iterator_flags is an enumeration that defines bit
 568  * positions into trace_flags that controls the output.
 569  *
 570  * NOTE: These bits must match the trace_options array in
 571  *       trace.c.
 572  */
 573 enum trace_iterator_flags {
 574         TRACE_ITER_PRINT_PARENT         = 0x01,
 575         TRACE_ITER_SYM_OFFSET           = 0x02,
 576         TRACE_ITER_SYM_ADDR             = 0x04,
 577         TRACE_ITER_VERBOSE              = 0x08,
 578         TRACE_ITER_RAW                  = 0x10,
 579         TRACE_ITER_HEX                  = 0x20,
 580         TRACE_ITER_BIN                  = 0x40,
 581         TRACE_ITER_BLOCK                = 0x80,
 582         TRACE_ITER_STACKTRACE           = 0x100,
 583         TRACE_ITER_PRINTK               = 0x200,
 584         TRACE_ITER_PREEMPTONLY          = 0x400,
 585         TRACE_ITER_BRANCH               = 0x800,
 586         TRACE_ITER_ANNOTATE             = 0x1000,
 587         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 588         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 589         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 590         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 591         TRACE_ITER_LATENCY_FMT          = 0x20000,
 592         TRACE_ITER_SLEEP_TIME           = 0x40000,
 593         TRACE_ITER_GRAPH_TIME           = 0x80000,
 594         TRACE_ITER_RECORD_CMD           = 0x100000,
 595 };
 596
 597 /*
 598  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 599  * control the output of kernel symbols.
 600  */
 601 #define TRACE_ITER_SYM_MASK \
 602         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 603
 604 extern struct tracer nop_trace;
 605
 606 #ifdef CONFIG_BRANCH_TRACER
 607 extern int enable_branch_tracing(struct trace_array *tr);
 608 extern void disable_branch_tracing(void);
 609 static inline int trace_branch_enable(struct trace_array *tr)
 610 {
 611         if (trace_flags & TRACE_ITER_BRANCH)
 612                 return enable_branch_tracing(tr);
 613         return 0;
 614 }
 615 static inline void trace_branch_disable(void)
 616 {
 617         /* due to races, always disable */
 618         disable_branch_tracing();
 619 }
 620 #else
 621 static inline int trace_branch_enable(struct trace_array *tr)
 622 {
 623         return 0;
 624 }
 625 static inline void trace_branch_disable(void)
 626 {
 627 }
 628 #endif /* CONFIG_BRANCH_TRACER */
 629
 630 /* set ring buffers to default size if not already done so */
 631 int tracing_update_buffers(void);
 632
 633 /* trace event type bit fields, not numeric */
 634 enum {
 635         TRACE_EVENT_TYPE_PRINTF         = 1,
 636         TRACE_EVENT_TYPE_RAW            = 2,
 637 };
 638
 639 struct ftrace_event_field {
 640         struct list_head        link;
 641         char                    *name;
 642         char                    *type;
 643         int                     filter_type;
 644         int                     offset;
 645         int                     size;
 646         int                     is_signed;
 647 };
 648
 649 struct event_filter {
 650         int                     n_preds;
 651         struct filter_pred      **preds;
 652         char                    *filter_string;
 653 };
 654
 655 struct event_subsystem {
 656         struct list_head        list;
 657         const char              *name;
 658         struct dentry           *entry;
 659         struct event_filter     *filter;
 660         int                     nr_events;
 661 };
 662
 663 struct filter_pred;
 664 struct regex;
 665
 666 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
 667                                  int val1, int val2);
 668
 669 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 670
 671 enum regex_type {
 672         MATCH_FULL = 0,
 673         MATCH_FRONT_ONLY,
 674         MATCH_MIDDLE_ONLY,
 675         MATCH_END_ONLY,
 676 };
 677
 678 struct regex {
 679         char                    pattern[MAX_FILTER_STR_VAL];
 680         int                     len;
 681         int                     field_len;
 682         regex_match_func        match;
 683 };
 684
 685 struct filter_pred {
 686         filter_pred_fn_t        fn;
 687         u64                     val;
 688         struct regex            regex;
 689         char                    *field_name;
 690         int                     offset;
 691         int                     not;
 692         int                     op;
 693         int                     pop_n;
 694 };
 695
 696 extern struct list_head ftrace_common_fields;
 697
 698 extern enum regex_type
 699 filter_parse_regex(char *buff, int len, char **search, int *not);
 700 extern void print_event_filter(struct ftrace_event_call *call,
 701                                struct trace_seq *s);
 702 extern int apply_event_filter(struct ftrace_event_call *call,
 703                               char *filter_string);
 704 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 705                                         char *filter_string);
 706 extern void print_subsystem_event_filter(struct event_subsystem *system,
 707                                          struct trace_seq *s);
 708 extern int filter_assign_type(const char *type);
 709
 710 struct list_head *
 711 trace_get_fields(struct ftrace_event_call *event_call);
 712
 713 static inline int
 714 filter_check_discard(struct ftrace_event_call *call, void *rec,
 715                      struct ring_buffer *buffer,
 716                      struct ring_buffer_event *event)
 717 {
 718         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 719             !filter_match_preds(call->filter, rec)) {
 720                 ring_buffer_discard_commit(buffer, event);
 721                 return 1;
 722         }
 723
 724         return 0;
 725 }
 726
 727 extern void trace_event_enable_cmd_record(bool enable);
 728
 729 extern struct mutex event_mutex;
 730 extern struct list_head ftrace_events;
 731
 732 extern const char *__start___trace_bprintk_fmt[];
 733 extern const char *__stop___trace_bprintk_fmt[];
 734
 735 #undef FTRACE_ENTRY
 736 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
 737         extern struct ftrace_event_call                                 \
 738         __attribute__((__aligned__(4))) event_##call;
 739 #undef FTRACE_ENTRY_DUP
 740 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
 741         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
 742 #include "trace_entries.h"
 743
 744 #endif /* _LINUX_KERNEL_TRACE_H */