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 struct uprobe_trace_entry_head {
 107         struct trace_entry      ent;
 108         unsigned long           ip;
 109 };
 110
 111 /*
 112  * trace_flag_type is an enumeration that holds different
 113  * states when a trace occurs. These are:
 114  *  IRQS_OFF            - interrupts were disabled
 115  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 116  *  NEED_RESCHED        - reschedule is requested
 117  *  HARDIRQ             - inside an interrupt handler
 118  *  SOFTIRQ             - inside a softirq handler
 119  */
 120 enum trace_flag_type {
 121         TRACE_FLAG_IRQS_OFF             = 0x01,
 122         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 123         TRACE_FLAG_NEED_RESCHED         = 0x04,
 124         TRACE_FLAG_HARDIRQ              = 0x08,
 125         TRACE_FLAG_SOFTIRQ              = 0x10,
 126 };
 127
 128 #define TRACE_BUF_SIZE          1024
 129
 130 /*
 131  * The CPU trace array - it consists of thousands of trace entries
 132  * plus some other descriptor data: (for example which task started
 133  * the trace, etc.)
 134  */
 135 struct trace_array_cpu {
 136         atomic_t                disabled;
 137         void                    *buffer_page;   /* ring buffer spare */
 138
 139         unsigned long           entries;
 140         unsigned long           saved_latency;
 141         unsigned long           critical_start;
 142         unsigned long           critical_end;
 143         unsigned long           critical_sequence;
 144         unsigned long           nice;
 145         unsigned long           policy;
 146         unsigned long           rt_priority;
 147         unsigned long           skipped_entries;
 148         cycle_t                 preempt_timestamp;
 149         pid_t                   pid;
 150         kuid_t                  uid;
 151         char                    comm[TASK_COMM_LEN];
 152 };
 153
 154 /*
 155  * The trace array - an array of per-CPU trace arrays. This is the
 156  * highest level data structure that individual tracers deal with.
 157  * They have on/off state as well:
 158  */
 159 struct trace_array {
 160         struct ring_buffer      *buffer;
 161         int                     cpu;
 162         int                     buffer_disabled;
 163         cycle_t                 time_start;
 164         struct task_struct      *waiter;
 165         struct trace_array_cpu  *data[NR_CPUS];
 166 };
 167
 168 #define FTRACE_CMP_TYPE(var, type) \
 169         __builtin_types_compatible_p(typeof(var), type *)
 170
 171 #undef IF_ASSIGN
 172 #define IF_ASSIGN(var, entry, etype, id)                \
 173         if (FTRACE_CMP_TYPE(var, etype)) {              \
 174                 var = (typeof(var))(entry);             \
 175                 WARN_ON(id && (entry)->type != id);     \
 176                 break;                                  \
 177         }
 178
 179 /* Will cause compile errors if type is not found. */
 180 extern void __ftrace_bad_type(void);
 181
 182 /*
 183  * The trace_assign_type is a verifier that the entry type is
 184  * the same as the type being assigned. To add new types simply
 185  * add a line with the following format:
 186  *
 187  * IF_ASSIGN(var, ent, type, id);
 188  *
 189  *  Where "type" is the trace type that includes the trace_entry
 190  *  as the "ent" item. And "id" is the trace identifier that is
 191  *  used in the trace_type enum.
 192  *
 193  *  If the type can have more than one id, then use zero.
 194  */
 195 #define trace_assign_type(var, ent)                                     \
 196         do {                                                            \
 197                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 198                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 199                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 200                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 201                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 202                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 203                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 204                           TRACE_MMIO_RW);                               \
 205                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 206                           TRACE_MMIO_MAP);                              \
 207                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 208                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 209                           TRACE_GRAPH_ENT);             \
 210                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 211                           TRACE_GRAPH_RET);             \
 212                 __ftrace_bad_type();                                    \
 213         } while (0)
 214
 215 /*
 216  * An option specific to a tracer. This is a boolean value.
 217  * The bit is the bit index that sets its value on the
 218  * flags value in struct tracer_flags.
 219  */
 220 struct tracer_opt {
 221         const char      *name; /* Will appear on the trace_options file */
 222         u32             bit; /* Mask assigned in val field in tracer_flags */
 223 };
 224
 225 /*
 226  * The set of specific options for a tracer. Your tracer
 227  * have to set the initial value of the flags val.
 228  */
 229 struct tracer_flags {
 230         u32                     val;
 231         struct tracer_opt       *opts;
 232 };
 233
 234 /* Makes more easy to define a tracer opt */
 235 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 236
 237
 238 /**
 239  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 240  * @name: the name chosen to select it on the available_tracers file
 241  * @init: called when one switches to this tracer (echo name > current_tracer)
 242  * @reset: called when one switches to another tracer
 243  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 244  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 245  * @open: called when the trace file is opened
 246  * @pipe_open: called when the trace_pipe file is opened
 247  * @wait_pipe: override how the user waits for traces on trace_pipe
 248  * @close: called when the trace file is released
 249  * @pipe_close: called when the trace_pipe file is released
 250  * @read: override the default read callback on trace_pipe
 251  * @splice_read: override the default splice_read callback on trace_pipe
 252  * @selftest: selftest to run on boot (see trace_selftest.c)
 253  * @print_headers: override the first lines that describe your columns
 254  * @print_line: callback that prints a trace
 255  * @set_flag: signals one of your private flags changed (trace_options file)
 256  * @flags: your private flags
 257  */
 258 struct tracer {
 259         const char              *name;
 260         int                     (*init)(struct trace_array *tr);
 261         void                    (*reset)(struct trace_array *tr);
 262         void                    (*start)(struct trace_array *tr);
 263         void                    (*stop)(struct trace_array *tr);
 264         void                    (*open)(struct trace_iterator *iter);
 265         void                    (*pipe_open)(struct trace_iterator *iter);
 266         void                    (*wait_pipe)(struct trace_iterator *iter);
 267         void                    (*close)(struct trace_iterator *iter);
 268         void                    (*pipe_close)(struct trace_iterator *iter);
 269         ssize_t                 (*read)(struct trace_iterator *iter,
 270                                         struct file *filp, char __user *ubuf,
 271                                         size_t cnt, loff_t *ppos);
 272         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 273                                                struct file *filp,
 274                                                loff_t *ppos,
 275                                                struct pipe_inode_info *pipe,
 276                                                size_t len,
 277                                                unsigned int flags);
 278 #ifdef CONFIG_FTRACE_STARTUP_TEST
 279         int                     (*selftest)(struct tracer *trace,
 280                                             struct trace_array *tr);
 281 #endif
 282         void                    (*print_header)(struct seq_file *m);
 283         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 284         /* If you handled the flag setting, return 0 */
 285         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 286         struct tracer           *next;
 287         struct tracer_flags     *flags;
 288         bool                    print_max;
 289         bool                    use_max_tr;
 290 };
 291
 292
 293 /* Only current can touch trace_recursion */
 294 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
 295 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
 296
 297 /* Ring buffer has the 10 LSB bits to count */
 298 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
 299
 300 /* for function tracing recursion */
 301 enum {
 302         TRACE_INTERNAL_BIT = 11,
 303         TRACE_INTERNAL_NMI_BIT,
 304         TRACE_INTERNAL_IRQ_BIT,
 305         TRACE_INTERNAL_SIRQ_BIT,
 306
 307         TRACE_GLOBAL_BIT,
 308         TRACE_GLOBAL_NMI_BIT,
 309         TRACE_GLOBAL_IRQ_BIT,
 310         TRACE_GLOBAL_SIRQ_BIT,
 311
 312         TRACE_CONTROL_BIT,
 313
 314 /*
 315  * Abuse of the trace_recursion.
 316  * As we need a way to maintain state if we are tracing the function
 317  * graph in irq because we want to trace a particular function that
 318  * was called in irq context but we have irq tracing off. Since this
 319  * can only be modified by current, we can reuse trace_recursion.
 320  */
 321         TRACE_IRQ_BIT,
 322 };
 323
 324 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (1<<(bit)); } while (0)
 325 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
 326 #define trace_recursion_test(bit)       ((current)->trace_recursion & (1<<(bit)))
 327
 328 #define TRACE_PIPE_ALL_CPU      -1
 329
 330 static inline struct ring_buffer_iter *
 331 trace_buffer_iter(struct trace_iterator *iter, int cpu)
 332 {
 333         if (iter->buffer_iter && iter->buffer_iter[cpu])
 334                 return iter->buffer_iter[cpu];
 335         return NULL;
 336 }
 337
 338 int tracer_init(struct tracer *t, struct trace_array *tr);
 339 int tracing_is_enabled(void);
 340 void tracing_reset(struct trace_array *tr, int cpu);
 341 void tracing_reset_online_cpus(struct trace_array *tr);
 342 void tracing_reset_current(int cpu);
 343 void tracing_reset_current_online_cpus(void);
 344 int tracing_open_generic(struct inode *inode, struct file *filp);
 345 struct dentry *trace_create_file(const char *name,
 346                                  umode_t mode,
 347                                  struct dentry *parent,
 348                                  void *data,
 349                                  const struct file_operations *fops);
 350
 351 struct dentry *tracing_init_dentry(void);
 352
 353 struct ring_buffer_event;
 354
 355 struct ring_buffer_event *
 356 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 357                           int type,
 358                           unsigned long len,
 359                           unsigned long flags,
 360                           int pc);
 361
 362 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 363                                                 struct trace_array_cpu *data);
 364
 365 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 366                                           int *ent_cpu, u64 *ent_ts);
 367
 368 void __buffer_unlock_commit(struct ring_buffer *buffer,
 369                             struct ring_buffer_event *event);
 370
 371 int trace_empty(struct trace_iterator *iter);
 372
 373 void *trace_find_next_entry_inc(struct trace_iterator *iter);
 374
 375 void trace_init_global_iter(struct trace_iterator *iter);
 376
 377 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 378
 379 void poll_wait_pipe(struct trace_iterator *iter);
 380
 381 void ftrace(struct trace_array *tr,
 382                             struct trace_array_cpu *data,
 383                             unsigned long ip,
 384                             unsigned long parent_ip,
 385                             unsigned long flags, int pc);
 386 void tracing_sched_switch_trace(struct trace_array *tr,
 387                                 struct task_struct *prev,
 388                                 struct task_struct *next,
 389                                 unsigned long flags, int pc);
 390
 391 void tracing_sched_wakeup_trace(struct trace_array *tr,
 392                                 struct task_struct *wakee,
 393                                 struct task_struct *cur,
 394                                 unsigned long flags, int pc);
 395 void trace_function(struct trace_array *tr,
 396                     unsigned long ip,
 397                     unsigned long parent_ip,
 398                     unsigned long flags, int pc);
 399 void trace_graph_function(struct trace_array *tr,
 400                     unsigned long ip,
 401                     unsigned long parent_ip,
 402                     unsigned long flags, int pc);
 403 void trace_latency_header(struct seq_file *m);
 404 void trace_default_header(struct seq_file *m);
 405 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 406 int trace_empty(struct trace_iterator *iter);
 407
 408 void trace_graph_return(struct ftrace_graph_ret *trace);
 409 int trace_graph_entry(struct ftrace_graph_ent *trace);
 410 void set_graph_array(struct trace_array *tr);
 411
 412 void tracing_start_cmdline_record(void);
 413 void tracing_stop_cmdline_record(void);
 414 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 415 void tracing_stop_sched_switch_record(void);
 416 void tracing_start_sched_switch_record(void);
 417 int register_tracer(struct tracer *type);
 418 int is_tracing_stopped(void);
 419
 420 extern cpumask_var_t __read_mostly tracing_buffer_mask;
 421
 422 #define for_each_tracing_cpu(cpu)       \
 423         for_each_cpu(cpu, tracing_buffer_mask)
 424
 425 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 426
 427 extern unsigned long tracing_thresh;
 428
 429 #ifdef CONFIG_TRACER_MAX_TRACE
 430 extern unsigned long tracing_max_latency;
 431
 432 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 433 void update_max_tr_single(struct trace_array *tr,
 434                           struct task_struct *tsk, int cpu);
 435 #endif /* CONFIG_TRACER_MAX_TRACE */
 436
 437 #ifdef CONFIG_STACKTRACE
 438 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 439                         int skip, int pc);
 440
 441 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
 442                              int skip, int pc, struct pt_regs *regs);
 443
 444 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 445                             int pc);
 446
 447 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 448                    int pc);
 449 #else
 450 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 451                                       unsigned long flags, int skip, int pc)
 452 {
 453 }
 454
 455 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
 456                                            unsigned long flags, int skip,
 457                                            int pc, struct pt_regs *regs)
 458 {
 459 }
 460
 461 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 462                                           unsigned long flags, int pc)
 463 {
 464 }
 465
 466 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 467                                  int skip, int pc)
 468 {
 469 }
 470 #endif /* CONFIG_STACKTRACE */
 471
 472 extern cycle_t ftrace_now(int cpu);
 473
 474 extern void trace_find_cmdline(int pid, char comm[]);
 475
 476 #ifdef CONFIG_DYNAMIC_FTRACE
 477 extern unsigned long ftrace_update_tot_cnt;
 478 #endif
 479 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 480 extern int DYN_FTRACE_TEST_NAME(void);
 481 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
 482 extern int DYN_FTRACE_TEST_NAME2(void);
 483
 484 extern int ring_buffer_expanded;
 485 extern bool tracing_selftest_disabled;
 486 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 487
 488 #ifdef CONFIG_FTRACE_STARTUP_TEST
 489 extern int trace_selftest_startup_function(struct tracer *trace,
 490                                            struct trace_array *tr);
 491 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 492                                                  struct trace_array *tr);
 493 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 494                                           struct trace_array *tr);
 495 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 496                                              struct trace_array *tr);
 497 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 498                                                  struct trace_array *tr);
 499 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 500                                          struct trace_array *tr);
 501 extern int trace_selftest_startup_nop(struct tracer *trace,
 502                                          struct trace_array *tr);
 503 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 504                                                struct trace_array *tr);
 505 extern int trace_selftest_startup_branch(struct tracer *trace,
 506                                          struct trace_array *tr);
 507 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 508
 509 extern void *head_page(struct trace_array_cpu *data);
 510 extern unsigned long long ns2usecs(cycle_t nsec);
 511 extern int
 512 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 513 extern int
 514 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 515 extern int
 516 trace_array_vprintk(struct trace_array *tr,
 517                     unsigned long ip, const char *fmt, va_list args);
 518 int trace_array_printk(struct trace_array *tr,
 519                        unsigned long ip, const char *fmt, ...);
 520 void trace_printk_seq(struct trace_seq *s);
 521 enum print_line_t print_trace_line(struct trace_iterator *iter);
 522
 523 extern unsigned long trace_flags;
 524
 525 extern int trace_clock_id;
 526
 527 /* Standard output formatting function used for function return traces */
 528 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 529
 530 /* Flag options */
 531 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 532 #define TRACE_GRAPH_PRINT_CPU           0x2
 533 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 534 #define TRACE_GRAPH_PRINT_PROC          0x8
 535 #define TRACE_GRAPH_PRINT_DURATION      0x10
 536 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 537
 538 extern enum print_line_t
 539 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 540 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 541 extern enum print_line_t
 542 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 543 extern void graph_trace_open(struct trace_iterator *iter);
 544 extern void graph_trace_close(struct trace_iterator *iter);
 545 extern int __trace_graph_entry(struct trace_array *tr,
 546                                struct ftrace_graph_ent *trace,
 547                                unsigned long flags, int pc);
 548 extern void __trace_graph_return(struct trace_array *tr,
 549                                  struct ftrace_graph_ret *trace,
 550                                  unsigned long flags, int pc);
 551
 552
 553 #ifdef CONFIG_DYNAMIC_FTRACE
 554 /* TODO: make this variable */
 555 #define FTRACE_GRAPH_MAX_FUNCS          32
 556 extern int ftrace_graph_filter_enabled;
 557 extern int ftrace_graph_count;
 558 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 559
 560 static inline int ftrace_graph_addr(unsigned long addr)
 561 {
 562         int i;
 563
 564         if (!ftrace_graph_filter_enabled)
 565                 return 1;
 566
 567         for (i = 0; i < ftrace_graph_count; i++) {
 568                 if (addr == ftrace_graph_funcs[i]) {
 569                         /*
 570                          * If no irqs are to be traced, but a set_graph_function
 571                          * is set, and called by an interrupt handler, we still
 572                          * want to trace it.
 573                          */
 574                         if (in_irq())
 575                                 trace_recursion_set(TRACE_IRQ_BIT);
 576                         else
 577                                 trace_recursion_clear(TRACE_IRQ_BIT);
 578                         return 1;
 579                 }
 580         }
 581
 582         return 0;
 583 }
 584 #else
 585 static inline int ftrace_graph_addr(unsigned long addr)
 586 {
 587         return 1;
 588 }
 589 #endif /* CONFIG_DYNAMIC_FTRACE */
 590 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 591 static inline enum print_line_t
 592 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 593 {
 594         return TRACE_TYPE_UNHANDLED;
 595 }
 596 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 597
 598 extern struct list_head ftrace_pids;
 599
 600 #ifdef CONFIG_FUNCTION_TRACER
 601 static inline int ftrace_trace_task(struct task_struct *task)
 602 {
 603         if (list_empty(&ftrace_pids))
 604                 return 1;
 605
 606         return test_tsk_trace_trace(task);
 607 }
 608 extern int ftrace_is_dead(void);
 609 #else
 610 static inline int ftrace_trace_task(struct task_struct *task)
 611 {
 612         return 1;
 613 }
 614 static inline int ftrace_is_dead(void) { return 0; }
 615 #endif
 616
 617 int ftrace_event_is_function(struct ftrace_event_call *call);
 618
 619 /*
 620  * struct trace_parser - servers for reading the user input separated by spaces
 621  * @cont: set if the input is not complete - no final space char was found
 622  * @buffer: holds the parsed user input
 623  * @idx: user input length
 624  * @size: buffer size
 625  */
 626 struct trace_parser {
 627         bool            cont;
 628         char            *buffer;
 629         unsigned        idx;
 630         unsigned        size;
 631 };
 632
 633 static inline bool trace_parser_loaded(struct trace_parser *parser)
 634 {
 635         return (parser->idx != 0);
 636 }
 637
 638 static inline bool trace_parser_cont(struct trace_parser *parser)
 639 {
 640         return parser->cont;
 641 }
 642
 643 static inline void trace_parser_clear(struct trace_parser *parser)
 644 {
 645         parser->cont = false;
 646         parser->idx = 0;
 647 }
 648
 649 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 650 extern void trace_parser_put(struct trace_parser *parser);
 651 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 652         size_t cnt, loff_t *ppos);
 653
 654 /*
 655  * trace_iterator_flags is an enumeration that defines bit
 656  * positions into trace_flags that controls the output.
 657  *
 658  * NOTE: These bits must match the trace_options array in
 659  *       trace.c.
 660  */
 661 enum trace_iterator_flags {
 662         TRACE_ITER_PRINT_PARENT         = 0x01,
 663         TRACE_ITER_SYM_OFFSET           = 0x02,
 664         TRACE_ITER_SYM_ADDR             = 0x04,
 665         TRACE_ITER_VERBOSE              = 0x08,
 666         TRACE_ITER_RAW                  = 0x10,
 667         TRACE_ITER_HEX                  = 0x20,
 668         TRACE_ITER_BIN                  = 0x40,
 669         TRACE_ITER_BLOCK                = 0x80,
 670         TRACE_ITER_STACKTRACE           = 0x100,
 671         TRACE_ITER_PRINTK               = 0x200,
 672         TRACE_ITER_PREEMPTONLY          = 0x400,
 673         TRACE_ITER_BRANCH               = 0x800,
 674         TRACE_ITER_ANNOTATE             = 0x1000,
 675         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 676         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 677         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 678         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 679         TRACE_ITER_LATENCY_FMT          = 0x20000,
 680         TRACE_ITER_SLEEP_TIME           = 0x40000,
 681         TRACE_ITER_GRAPH_TIME           = 0x80000,
 682         TRACE_ITER_RECORD_CMD           = 0x100000,
 683         TRACE_ITER_OVERWRITE            = 0x200000,
 684         TRACE_ITER_STOP_ON_FREE         = 0x400000,
 685         TRACE_ITER_IRQ_INFO             = 0x800000,
 686         TRACE_ITER_MARKERS              = 0x1000000,
 687 };
 688
 689 /*
 690  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 691  * control the output of kernel symbols.
 692  */
 693 #define TRACE_ITER_SYM_MASK \
 694         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 695
 696 extern struct tracer nop_trace;
 697
 698 #ifdef CONFIG_BRANCH_TRACER
 699 extern int enable_branch_tracing(struct trace_array *tr);
 700 extern void disable_branch_tracing(void);
 701 static inline int trace_branch_enable(struct trace_array *tr)
 702 {
 703         if (trace_flags & TRACE_ITER_BRANCH)
 704                 return enable_branch_tracing(tr);
 705         return 0;
 706 }
 707 static inline void trace_branch_disable(void)
 708 {
 709         /* due to races, always disable */
 710         disable_branch_tracing();
 711 }
 712 #else
 713 static inline int trace_branch_enable(struct trace_array *tr)
 714 {
 715         return 0;
 716 }
 717 static inline void trace_branch_disable(void)
 718 {
 719 }
 720 #endif /* CONFIG_BRANCH_TRACER */
 721
 722 /* set ring buffers to default size if not already done so */
 723 int tracing_update_buffers(void);
 724
 725 /* trace event type bit fields, not numeric */
 726 enum {
 727         TRACE_EVENT_TYPE_PRINTF         = 1,
 728         TRACE_EVENT_TYPE_RAW            = 2,
 729 };
 730
 731 struct ftrace_event_field {
 732         struct list_head        link;
 733         char                    *name;
 734         char                    *type;
 735         int                     filter_type;
 736         int                     offset;
 737         int                     size;
 738         int                     is_signed;
 739 };
 740
 741 struct event_filter {
 742         int                     n_preds;        /* Number assigned */
 743         int                     a_preds;        /* allocated */
 744         struct filter_pred      *preds;
 745         struct filter_pred      *root;
 746         char                    *filter_string;
 747 };
 748
 749 struct event_subsystem {
 750         struct list_head        list;
 751         const char              *name;
 752         struct dentry           *entry;
 753         struct event_filter     *filter;
 754         int                     nr_events;
 755         int                     ref_count;
 756 };
 757
 758 #define FILTER_PRED_INVALID     ((unsigned short)-1)
 759 #define FILTER_PRED_IS_RIGHT    (1 << 15)
 760 #define FILTER_PRED_FOLD        (1 << 15)
 761
 762 /*
 763  * The max preds is the size of unsigned short with
 764  * two flags at the MSBs. One bit is used for both the IS_RIGHT
 765  * and FOLD flags. The other is reserved.
 766  *
 767  * 2^14 preds is way more than enough.
 768  */
 769 #define MAX_FILTER_PRED         16384
 770
 771 struct filter_pred;
 772 struct regex;
 773
 774 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
 775
 776 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 777
 778 enum regex_type {
 779         MATCH_FULL = 0,
 780         MATCH_FRONT_ONLY,
 781         MATCH_MIDDLE_ONLY,
 782         MATCH_END_ONLY,
 783 };
 784
 785 struct regex {
 786         char                    pattern[MAX_FILTER_STR_VAL];
 787         int                     len;
 788         int                     field_len;
 789         regex_match_func        match;
 790 };
 791
 792 struct filter_pred {
 793         filter_pred_fn_t        fn;
 794         u64                     val;
 795         struct regex            regex;
 796         unsigned short          *ops;
 797         struct ftrace_event_field *field;
 798         int                     offset;
 799         int                     not;
 800         int                     op;
 801         unsigned short          index;
 802         unsigned short          parent;
 803         unsigned short          left;
 804         unsigned short          right;
 805 };
 806
 807 extern struct list_head ftrace_common_fields;
 808
 809 extern enum regex_type
 810 filter_parse_regex(char *buff, int len, char **search, int *not);
 811 extern void print_event_filter(struct ftrace_event_call *call,
 812                                struct trace_seq *s);
 813 extern int apply_event_filter(struct ftrace_event_call *call,
 814                               char *filter_string);
 815 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 816                                         char *filter_string);
 817 extern void print_subsystem_event_filter(struct event_subsystem *system,
 818                                          struct trace_seq *s);
 819 extern int filter_assign_type(const char *type);
 820
 821 struct list_head *
 822 trace_get_fields(struct ftrace_event_call *event_call);
 823
 824 static inline int
 825 filter_check_discard(struct ftrace_event_call *call, void *rec,
 826                      struct ring_buffer *buffer,
 827                      struct ring_buffer_event *event)
 828 {
 829         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 830             !filter_match_preds(call->filter, rec)) {
 831                 ring_buffer_discard_commit(buffer, event);
 832                 return 1;
 833         }
 834
 835         return 0;
 836 }
 837
 838 extern void trace_event_enable_cmd_record(bool enable);
 839
 840 extern struct mutex event_mutex;
 841 extern struct list_head ftrace_events;
 842
 843 extern const char *__start___trace_bprintk_fmt[];
 844 extern const char *__stop___trace_bprintk_fmt[];
 845
 846 void trace_printk_init_buffers(void);
 847 void trace_printk_start_comm(void);
 848
 849 #undef FTRACE_ENTRY
 850 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
 851         extern struct ftrace_event_call                                 \
 852         __attribute__((__aligned__(4))) event_##call;
 853 #undef FTRACE_ENTRY_DUP
 854 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
 855         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 856                      filter)
 857 #include "trace_entries.h"
 858
 859 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
 860 int perf_ftrace_event_register(struct ftrace_event_call *call,
 861                                enum trace_reg type, void *data);
 862 #else
 863 #define perf_ftrace_event_register NULL
 864 #endif
 865
 866 #endif /* _LINUX_KERNEL_TRACE_H */