Pileus Git - ~andy/linux/blob - 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
 295 /*
 296  * For function tracing recursion:
 297  *  The order of these bits are important.
 298  *
 299  *  When function tracing occurs, the following steps are made:
 300  *   If arch does not support a ftrace feature:
 301  *    call internal function (uses INTERNAL bits) which calls...
 302  *   If callback is registered to the "global" list, the list
 303  *    function is called and recursion checks the GLOBAL bits.
 304  *    then this function calls...
 305  *   The function callback, which can use the FTRACE bits to
 306  *    check for recursion.
 307  *
 308  * Now if the arch does not suppport a feature, and it calls
 309  * the global list function which calls the ftrace callback
 310  * all three of these steps will do a recursion protection.
 311  * There's no reason to do one if the previous caller already
 312  * did. The recursion that we are protecting against will
 313  * go through the same steps again.
 314  *
 315  * To prevent the multiple recursion checks, if a recursion
 316  * bit is set that is higher than the MAX bit of the current
 317  * check, then we know that the check was made by the previous
 318  * caller, and we can skip the current check.
 319  */
 320 enum {
 321         TRACE_BUFFER_BIT,
 322         TRACE_BUFFER_NMI_BIT,
 323         TRACE_BUFFER_IRQ_BIT,
 324         TRACE_BUFFER_SIRQ_BIT,
 325
 326         /* Start of function recursion bits */
 327         TRACE_FTRACE_BIT,
 328         TRACE_FTRACE_NMI_BIT,
 329         TRACE_FTRACE_IRQ_BIT,
 330         TRACE_FTRACE_SIRQ_BIT,
 331
 332         /* GLOBAL_BITs must be greater than FTRACE_BITs */
 333         TRACE_GLOBAL_BIT,
 334         TRACE_GLOBAL_NMI_BIT,
 335         TRACE_GLOBAL_IRQ_BIT,
 336         TRACE_GLOBAL_SIRQ_BIT,
 337
 338         /* INTERNAL_BITs must be greater than GLOBAL_BITs */
 339         TRACE_INTERNAL_BIT,
 340         TRACE_INTERNAL_NMI_BIT,
 341         TRACE_INTERNAL_IRQ_BIT,
 342         TRACE_INTERNAL_SIRQ_BIT,
 343
 344         TRACE_CONTROL_BIT,
 345
 346 /*
 347  * Abuse of the trace_recursion.
 348  * As we need a way to maintain state if we are tracing the function
 349  * graph in irq because we want to trace a particular function that
 350  * was called in irq context but we have irq tracing off. Since this
 351  * can only be modified by current, we can reuse trace_recursion.
 352  */
 353         TRACE_IRQ_BIT,
 354 };
 355
 356 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (1<<(bit)); } while (0)
 357 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
 358 #define trace_recursion_test(bit)       ((current)->trace_recursion & (1<<(bit)))
 359
 360 #define TRACE_CONTEXT_BITS      4
 361
 362 #define TRACE_FTRACE_START      TRACE_FTRACE_BIT
 363 #define TRACE_FTRACE_MAX        ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
 364
 365 #define TRACE_GLOBAL_START      TRACE_GLOBAL_BIT
 366 #define TRACE_GLOBAL_MAX        ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
 367
 368 #define TRACE_LIST_START        TRACE_INTERNAL_BIT
 369 #define TRACE_LIST_MAX          ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
 370
 371 #define TRACE_CONTEXT_MASK      TRACE_LIST_MAX
 372
 373 static __always_inline int trace_get_context_bit(void)
 374 {
 375         int bit;
 376
 377         if (in_interrupt()) {
 378                 if (in_nmi())
 379                         bit = 0;
 380
 381                 else if (in_irq())
 382                         bit = 1;
 383                 else
 384                         bit = 2;
 385         } else
 386                 bit = 3;
 387
 388         return bit;
 389 }
 390
 391 static __always_inline int trace_test_and_set_recursion(int start, int max)
 392 {
 393         unsigned int val = current->trace_recursion;
 394         int bit;
 395
 396         /* A previous recursion check was made */
 397         if ((val & TRACE_CONTEXT_MASK) > max)
 398                 return 0;
 399
 400         bit = trace_get_context_bit() + start;
 401         if (unlikely(val & (1 << bit)))
 402                 return -1;
 403
 404         val |= 1 << bit;
 405         current->trace_recursion = val;
 406         barrier();
 407
 408         return bit;
 409 }
 410
 411 static __always_inline void trace_clear_recursion(int bit)
 412 {
 413         unsigned int val = current->trace_recursion;
 414
 415         if (!bit)
 416                 return;
 417
 418         bit = 1 << bit;
 419         val &= ~bit;
 420
 421         barrier();
 422         current->trace_recursion = val;
 423 }
 424
 425 #define TRACE_PIPE_ALL_CPU      -1
 426
 427 static inline struct ring_buffer_iter *
 428 trace_buffer_iter(struct trace_iterator *iter, int cpu)
 429 {
 430         if (iter->buffer_iter && iter->buffer_iter[cpu])
 431                 return iter->buffer_iter[cpu];
 432         return NULL;
 433 }
 434
 435 int tracer_init(struct tracer *t, struct trace_array *tr);
 436 int tracing_is_enabled(void);
 437 void tracing_reset(struct trace_array *tr, int cpu);
 438 void tracing_reset_online_cpus(struct trace_array *tr);
 439 void tracing_reset_current(int cpu);
 440 void tracing_reset_current_online_cpus(void);
 441 int tracing_open_generic(struct inode *inode, struct file *filp);
 442 struct dentry *trace_create_file(const char *name,
 443                                  umode_t mode,
 444                                  struct dentry *parent,
 445                                  void *data,
 446                                  const struct file_operations *fops);
 447
 448 struct dentry *tracing_init_dentry(void);
 449
 450 struct ring_buffer_event;
 451
 452 struct ring_buffer_event *
 453 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 454                           int type,
 455                           unsigned long len,
 456                           unsigned long flags,
 457                           int pc);
 458
 459 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 460                                                 struct trace_array_cpu *data);
 461
 462 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 463                                           int *ent_cpu, u64 *ent_ts);
 464
 465 void __buffer_unlock_commit(struct ring_buffer *buffer,
 466                             struct ring_buffer_event *event);
 467
 468 int trace_empty(struct trace_iterator *iter);
 469
 470 void *trace_find_next_entry_inc(struct trace_iterator *iter);
 471
 472 void trace_init_global_iter(struct trace_iterator *iter);
 473
 474 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 475
 476 void poll_wait_pipe(struct trace_iterator *iter);
 477
 478 void ftrace(struct trace_array *tr,
 479                             struct trace_array_cpu *data,
 480                             unsigned long ip,
 481                             unsigned long parent_ip,
 482                             unsigned long flags, int pc);
 483 void tracing_sched_switch_trace(struct trace_array *tr,
 484                                 struct task_struct *prev,
 485                                 struct task_struct *next,
 486                                 unsigned long flags, int pc);
 487
 488 void tracing_sched_wakeup_trace(struct trace_array *tr,
 489                                 struct task_struct *wakee,
 490                                 struct task_struct *cur,
 491                                 unsigned long flags, int pc);
 492 void trace_function(struct trace_array *tr,
 493                     unsigned long ip,
 494                     unsigned long parent_ip,
 495                     unsigned long flags, int pc);
 496 void trace_graph_function(struct trace_array *tr,
 497                     unsigned long ip,
 498                     unsigned long parent_ip,
 499                     unsigned long flags, int pc);
 500 void trace_latency_header(struct seq_file *m);
 501 void trace_default_header(struct seq_file *m);
 502 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 503 int trace_empty(struct trace_iterator *iter);
 504
 505 void trace_graph_return(struct ftrace_graph_ret *trace);
 506 int trace_graph_entry(struct ftrace_graph_ent *trace);
 507 void set_graph_array(struct trace_array *tr);
 508
 509 void tracing_start_cmdline_record(void);
 510 void tracing_stop_cmdline_record(void);
 511 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 512 void tracing_stop_sched_switch_record(void);
 513 void tracing_start_sched_switch_record(void);
 514 int register_tracer(struct tracer *type);
 515 int is_tracing_stopped(void);
 516
 517 extern cpumask_var_t __read_mostly tracing_buffer_mask;
 518
 519 #define for_each_tracing_cpu(cpu)       \
 520         for_each_cpu(cpu, tracing_buffer_mask)
 521
 522 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 523
 524 extern unsigned long tracing_thresh;
 525
 526 #ifdef CONFIG_TRACER_MAX_TRACE
 527 extern unsigned long tracing_max_latency;
 528
 529 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 530 void update_max_tr_single(struct trace_array *tr,
 531                           struct task_struct *tsk, int cpu);
 532 #endif /* CONFIG_TRACER_MAX_TRACE */
 533
 534 #ifdef CONFIG_STACKTRACE
 535 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 536                         int skip, int pc);
 537
 538 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
 539                              int skip, int pc, struct pt_regs *regs);
 540
 541 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 542                             int pc);
 543
 544 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 545                    int pc);
 546 #else
 547 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 548                                       unsigned long flags, int skip, int pc)
 549 {
 550 }
 551
 552 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
 553                                            unsigned long flags, int skip,
 554                                            int pc, struct pt_regs *regs)
 555 {
 556 }
 557
 558 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 559                                           unsigned long flags, int pc)
 560 {
 561 }
 562
 563 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 564                                  int skip, int pc)
 565 {
 566 }
 567 #endif /* CONFIG_STACKTRACE */
 568
 569 extern cycle_t ftrace_now(int cpu);
 570
 571 extern void trace_find_cmdline(int pid, char comm[]);
 572
 573 #ifdef CONFIG_DYNAMIC_FTRACE
 574 extern unsigned long ftrace_update_tot_cnt;
 575 #endif
 576 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 577 extern int DYN_FTRACE_TEST_NAME(void);
 578 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
 579 extern int DYN_FTRACE_TEST_NAME2(void);
 580
 581 extern int ring_buffer_expanded;
 582 extern bool tracing_selftest_disabled;
 583 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 584
 585 #ifdef CONFIG_FTRACE_STARTUP_TEST
 586 extern int trace_selftest_startup_function(struct tracer *trace,
 587                                            struct trace_array *tr);
 588 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 589                                                  struct trace_array *tr);
 590 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 591                                           struct trace_array *tr);
 592 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 593                                              struct trace_array *tr);
 594 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 595                                                  struct trace_array *tr);
 596 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 597                                          struct trace_array *tr);
 598 extern int trace_selftest_startup_nop(struct tracer *trace,
 599                                          struct trace_array *tr);
 600 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 601                                                struct trace_array *tr);
 602 extern int trace_selftest_startup_branch(struct tracer *trace,
 603                                          struct trace_array *tr);
 604 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 605
 606 extern void *head_page(struct trace_array_cpu *data);
 607 extern unsigned long long ns2usecs(cycle_t nsec);
 608 extern int
 609 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 610 extern int
 611 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 612 extern int
 613 trace_array_vprintk(struct trace_array *tr,
 614                     unsigned long ip, const char *fmt, va_list args);
 615 int trace_array_printk(struct trace_array *tr,
 616                        unsigned long ip, const char *fmt, ...);
 617 void trace_printk_seq(struct trace_seq *s);
 618 enum print_line_t print_trace_line(struct trace_iterator *iter);
 619
 620 extern unsigned long trace_flags;
 621
 622 extern int trace_clock_id;
 623
 624 /* Standard output formatting function used for function return traces */
 625 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 626
 627 /* Flag options */
 628 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 629 #define TRACE_GRAPH_PRINT_CPU           0x2
 630 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 631 #define TRACE_GRAPH_PRINT_PROC          0x8
 632 #define TRACE_GRAPH_PRINT_DURATION      0x10
 633 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 634
 635 extern enum print_line_t
 636 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 637 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 638 extern enum print_line_t
 639 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 640 extern void graph_trace_open(struct trace_iterator *iter);
 641 extern void graph_trace_close(struct trace_iterator *iter);
 642 extern int __trace_graph_entry(struct trace_array *tr,
 643                                struct ftrace_graph_ent *trace,
 644                                unsigned long flags, int pc);
 645 extern void __trace_graph_return(struct trace_array *tr,
 646                                  struct ftrace_graph_ret *trace,
 647                                  unsigned long flags, int pc);
 648
 649
 650 #ifdef CONFIG_DYNAMIC_FTRACE
 651 /* TODO: make this variable */
 652 #define FTRACE_GRAPH_MAX_FUNCS          32
 653 extern int ftrace_graph_filter_enabled;
 654 extern int ftrace_graph_count;
 655 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 656
 657 static inline int ftrace_graph_addr(unsigned long addr)
 658 {
 659         int i;
 660
 661         if (!ftrace_graph_filter_enabled)
 662                 return 1;
 663
 664         for (i = 0; i < ftrace_graph_count; i++) {
 665                 if (addr == ftrace_graph_funcs[i]) {
 666                         /*
 667                          * If no irqs are to be traced, but a set_graph_function
 668                          * is set, and called by an interrupt handler, we still
 669                          * want to trace it.
 670                          */
 671                         if (in_irq())
 672                                 trace_recursion_set(TRACE_IRQ_BIT);
 673                         else
 674                                 trace_recursion_clear(TRACE_IRQ_BIT);
 675                         return 1;
 676                 }
 677         }
 678
 679         return 0;
 680 }
 681 #else
 682 static inline int ftrace_graph_addr(unsigned long addr)
 683 {
 684         return 1;
 685 }
 686 #endif /* CONFIG_DYNAMIC_FTRACE */
 687 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 688 static inline enum print_line_t
 689 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 690 {
 691         return TRACE_TYPE_UNHANDLED;
 692 }
 693 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 694
 695 extern struct list_head ftrace_pids;
 696
 697 #ifdef CONFIG_FUNCTION_TRACER
 698 static inline int ftrace_trace_task(struct task_struct *task)
 699 {
 700         if (list_empty(&ftrace_pids))
 701                 return 1;
 702
 703         return test_tsk_trace_trace(task);
 704 }
 705 extern int ftrace_is_dead(void);
 706 #else
 707 static inline int ftrace_trace_task(struct task_struct *task)
 708 {
 709         return 1;
 710 }
 711 static inline int ftrace_is_dead(void) { return 0; }
 712 #endif
 713
 714 int ftrace_event_is_function(struct ftrace_event_call *call);
 715
 716 /*
 717  * struct trace_parser - servers for reading the user input separated by spaces
 718  * @cont: set if the input is not complete - no final space char was found
 719  * @buffer: holds the parsed user input
 720  * @idx: user input length
 721  * @size: buffer size
 722  */
 723 struct trace_parser {
 724         bool            cont;
 725         char            *buffer;
 726         unsigned        idx;
 727         unsigned        size;
 728 };
 729
 730 static inline bool trace_parser_loaded(struct trace_parser *parser)
 731 {
 732         return (parser->idx != 0);
 733 }
 734
 735 static inline bool trace_parser_cont(struct trace_parser *parser)
 736 {
 737         return parser->cont;
 738 }
 739
 740 static inline void trace_parser_clear(struct trace_parser *parser)
 741 {
 742         parser->cont = false;
 743         parser->idx = 0;
 744 }
 745
 746 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 747 extern void trace_parser_put(struct trace_parser *parser);
 748 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 749         size_t cnt, loff_t *ppos);
 750
 751 /*
 752  * trace_iterator_flags is an enumeration that defines bit
 753  * positions into trace_flags that controls the output.
 754  *
 755  * NOTE: These bits must match the trace_options array in
 756  *       trace.c.
 757  */
 758 enum trace_iterator_flags {
 759         TRACE_ITER_PRINT_PARENT         = 0x01,
 760         TRACE_ITER_SYM_OFFSET           = 0x02,
 761         TRACE_ITER_SYM_ADDR             = 0x04,
 762         TRACE_ITER_VERBOSE              = 0x08,
 763         TRACE_ITER_RAW                  = 0x10,
 764         TRACE_ITER_HEX                  = 0x20,
 765         TRACE_ITER_BIN                  = 0x40,
 766         TRACE_ITER_BLOCK                = 0x80,
 767         TRACE_ITER_STACKTRACE           = 0x100,
 768         TRACE_ITER_PRINTK               = 0x200,
 769         TRACE_ITER_PREEMPTONLY          = 0x400,
 770         TRACE_ITER_BRANCH               = 0x800,
 771         TRACE_ITER_ANNOTATE             = 0x1000,
 772         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 773         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 774         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 775         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 776         TRACE_ITER_LATENCY_FMT          = 0x20000,
 777         TRACE_ITER_SLEEP_TIME           = 0x40000,
 778         TRACE_ITER_GRAPH_TIME           = 0x80000,
 779         TRACE_ITER_RECORD_CMD           = 0x100000,
 780         TRACE_ITER_OVERWRITE            = 0x200000,
 781         TRACE_ITER_STOP_ON_FREE         = 0x400000,
 782         TRACE_ITER_IRQ_INFO             = 0x800000,
 783         TRACE_ITER_MARKERS              = 0x1000000,
 784 };
 785
 786 /*
 787  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 788  * control the output of kernel symbols.
 789  */
 790 #define TRACE_ITER_SYM_MASK \
 791         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 792
 793 extern struct tracer nop_trace;
 794
 795 #ifdef CONFIG_BRANCH_TRACER
 796 extern int enable_branch_tracing(struct trace_array *tr);
 797 extern void disable_branch_tracing(void);
 798 static inline int trace_branch_enable(struct trace_array *tr)
 799 {
 800         if (trace_flags & TRACE_ITER_BRANCH)
 801                 return enable_branch_tracing(tr);
 802         return 0;
 803 }
 804 static inline void trace_branch_disable(void)
 805 {
 806         /* due to races, always disable */
 807         disable_branch_tracing();
 808 }
 809 #else
 810 static inline int trace_branch_enable(struct trace_array *tr)
 811 {
 812         return 0;
 813 }
 814 static inline void trace_branch_disable(void)
 815 {
 816 }
 817 #endif /* CONFIG_BRANCH_TRACER */
 818
 819 /* set ring buffers to default size if not already done so */
 820 int tracing_update_buffers(void);
 821
 822 /* trace event type bit fields, not numeric */
 823 enum {
 824         TRACE_EVENT_TYPE_PRINTF         = 1,
 825         TRACE_EVENT_TYPE_RAW            = 2,
 826 };
 827
 828 struct ftrace_event_field {
 829         struct list_head        link;
 830         char                    *name;
 831         char                    *type;
 832         int                     filter_type;
 833         int                     offset;
 834         int                     size;
 835         int                     is_signed;
 836 };
 837
 838 struct event_filter {
 839         int                     n_preds;        /* Number assigned */
 840         int                     a_preds;        /* allocated */
 841         struct filter_pred      *preds;
 842         struct filter_pred      *root;
 843         char                    *filter_string;
 844 };
 845
 846 struct event_subsystem {
 847         struct list_head        list;
 848         const char              *name;
 849         struct dentry           *entry;
 850         struct event_filter     *filter;
 851         int                     nr_events;
 852         int                     ref_count;
 853 };
 854
 855 #define FILTER_PRED_INVALID     ((unsigned short)-1)
 856 #define FILTER_PRED_IS_RIGHT    (1 << 15)
 857 #define FILTER_PRED_FOLD        (1 << 15)
 858
 859 /*
 860  * The max preds is the size of unsigned short with
 861  * two flags at the MSBs. One bit is used for both the IS_RIGHT
 862  * and FOLD flags. The other is reserved.
 863  *
 864  * 2^14 preds is way more than enough.
 865  */
 866 #define MAX_FILTER_PRED         16384
 867
 868 struct filter_pred;
 869 struct regex;
 870
 871 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
 872
 873 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 874
 875 enum regex_type {
 876         MATCH_FULL = 0,
 877         MATCH_FRONT_ONLY,
 878         MATCH_MIDDLE_ONLY,
 879         MATCH_END_ONLY,
 880 };
 881
 882 struct regex {
 883         char                    pattern[MAX_FILTER_STR_VAL];
 884         int                     len;
 885         int                     field_len;
 886         regex_match_func        match;
 887 };
 888
 889 struct filter_pred {
 890         filter_pred_fn_t        fn;
 891         u64                     val;
 892         struct regex            regex;
 893         unsigned short          *ops;
 894         struct ftrace_event_field *field;
 895         int                     offset;
 896         int                     not;
 897         int                     op;
 898         unsigned short          index;
 899         unsigned short          parent;
 900         unsigned short          left;
 901         unsigned short          right;
 902 };
 903
 904 extern struct list_head ftrace_common_fields;
 905
 906 extern enum regex_type
 907 filter_parse_regex(char *buff, int len, char **search, int *not);
 908 extern void print_event_filter(struct ftrace_event_call *call,
 909                                struct trace_seq *s);
 910 extern int apply_event_filter(struct ftrace_event_call *call,
 911                               char *filter_string);
 912 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 913                                         char *filter_string);
 914 extern void print_subsystem_event_filter(struct event_subsystem *system,
 915                                          struct trace_seq *s);
 916 extern int filter_assign_type(const char *type);
 917
 918 struct list_head *
 919 trace_get_fields(struct ftrace_event_call *event_call);
 920
 921 static inline int
 922 filter_check_discard(struct ftrace_event_call *call, void *rec,
 923                      struct ring_buffer *buffer,
 924                      struct ring_buffer_event *event)
 925 {
 926         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 927             !filter_match_preds(call->filter, rec)) {
 928                 ring_buffer_discard_commit(buffer, event);
 929                 return 1;
 930         }
 931
 932         return 0;
 933 }
 934
 935 extern void trace_event_enable_cmd_record(bool enable);
 936
 937 extern struct mutex event_mutex;
 938 extern struct list_head ftrace_events;
 939
 940 extern const char *__start___trace_bprintk_fmt[];
 941 extern const char *__stop___trace_bprintk_fmt[];
 942
 943 void trace_printk_init_buffers(void);
 944 void trace_printk_start_comm(void);
 945
 946 #undef FTRACE_ENTRY
 947 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
 948         extern struct ftrace_event_call                                 \
 949         __attribute__((__aligned__(4))) event_##call;
 950 #undef FTRACE_ENTRY_DUP
 951 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
 952         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 953                      filter)
 954 #include "trace_entries.h"
 955
 956 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
 957 int perf_ftrace_event_register(struct ftrace_event_call *call,
 958                                enum trace_reg type, void *data);
 959 #else
 960 #define perf_ftrace_event_register NULL
 961 #endif
 962
 963 #endif /* _LINUX_KERNEL_TRACE_H */