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/ftrace.h>
  11 #include <trace/boot.h>
  12 #include <linux/kmemtrace.h>
  13 #include <trace/power.h>
  14
  15 #include <linux/trace_seq.h>
  16 #include <linux/ftrace_event.h>
  17
  18 enum trace_type {
  19         __TRACE_FIRST_TYPE = 0,
  20
  21         TRACE_FN,
  22         TRACE_CTX,
  23         TRACE_WAKE,
  24         TRACE_STACK,
  25         TRACE_PRINT,
  26         TRACE_BPRINT,
  27         TRACE_SPECIAL,
  28         TRACE_MMIO_RW,
  29         TRACE_MMIO_MAP,
  30         TRACE_BRANCH,
  31         TRACE_BOOT_CALL,
  32         TRACE_BOOT_RET,
  33         TRACE_GRAPH_RET,
  34         TRACE_GRAPH_ENT,
  35         TRACE_USER_STACK,
  36         TRACE_HW_BRANCHES,
  37         TRACE_KMEM_ALLOC,
  38         TRACE_KMEM_FREE,
  39         TRACE_POWER,
  40         TRACE_BLK,
  41         TRACE_KPROBE,
  42         TRACE_KRETPROBE,
  43
  44         __TRACE_LAST_TYPE,
  45 };
  46
  47 /*
  48  * Function trace entry - function address and parent function addres:
  49  */
  50 struct ftrace_entry {
  51         struct trace_entry      ent;
  52         unsigned long           ip;
  53         unsigned long           parent_ip;
  54 };
  55
  56 /* Function call entry */
  57 struct ftrace_graph_ent_entry {
  58         struct trace_entry              ent;
  59         struct ftrace_graph_ent         graph_ent;
  60 };
  61
  62 /* Function return entry */
  63 struct ftrace_graph_ret_entry {
  64         struct trace_entry              ent;
  65         struct ftrace_graph_ret         ret;
  66 };
  67 extern struct tracer boot_tracer;
  68
  69 /*
  70  * Context switch trace entry - which task (and prio) we switched from/to:
  71  */
  72 struct ctx_switch_entry {
  73         struct trace_entry      ent;
  74         unsigned int            prev_pid;
  75         unsigned char           prev_prio;
  76         unsigned char           prev_state;
  77         unsigned int            next_pid;
  78         unsigned char           next_prio;
  79         unsigned char           next_state;
  80         unsigned int            next_cpu;
  81 };
  82
  83 /*
  84  * Special (free-form) trace entry:
  85  */
  86 struct special_entry {
  87         struct trace_entry      ent;
  88         unsigned long           arg1;
  89         unsigned long           arg2;
  90         unsigned long           arg3;
  91 };
  92
  93 /*
  94  * Stack-trace entry:
  95  */
  96
  97 #define FTRACE_STACK_ENTRIES    8
  98
  99 struct stack_entry {
 100         struct trace_entry      ent;
 101         unsigned long           caller[FTRACE_STACK_ENTRIES];
 102 };
 103
 104 struct userstack_entry {
 105         struct trace_entry      ent;
 106         unsigned long           caller[FTRACE_STACK_ENTRIES];
 107 };
 108
 109 /*
 110  * trace_printk entry:
 111  */
 112 struct bprint_entry {
 113         struct trace_entry      ent;
 114         unsigned long           ip;
 115         const char              *fmt;
 116         u32                     buf[];
 117 };
 118
 119 struct print_entry {
 120         struct trace_entry      ent;
 121         unsigned long           ip;
 122         char                    buf[];
 123 };
 124
 125 #define TRACE_OLD_SIZE          88
 126
 127 struct trace_field_cont {
 128         unsigned char           type;
 129         /* Temporary till we get rid of this completely */
 130         char                    buf[TRACE_OLD_SIZE - 1];
 131 };
 132
 133 struct trace_mmiotrace_rw {
 134         struct trace_entry      ent;
 135         struct mmiotrace_rw     rw;
 136 };
 137
 138 struct trace_mmiotrace_map {
 139         struct trace_entry      ent;
 140         struct mmiotrace_map    map;
 141 };
 142
 143 struct trace_boot_call {
 144         struct trace_entry      ent;
 145         struct boot_trace_call boot_call;
 146 };
 147
 148 struct trace_boot_ret {
 149         struct trace_entry      ent;
 150         struct boot_trace_ret boot_ret;
 151 };
 152
 153 #define TRACE_FUNC_SIZE 30
 154 #define TRACE_FILE_SIZE 20
 155 struct trace_branch {
 156         struct trace_entry      ent;
 157         unsigned                line;
 158         char                    func[TRACE_FUNC_SIZE+1];
 159         char                    file[TRACE_FILE_SIZE+1];
 160         char                    correct;
 161 };
 162
 163 struct hw_branch_entry {
 164         struct trace_entry      ent;
 165         u64                     from;
 166         u64                     to;
 167 };
 168
 169 struct trace_power {
 170         struct trace_entry      ent;
 171         struct power_trace      state_data;
 172 };
 173
 174 enum kmemtrace_type_id {
 175         KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
 176         KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
 177         KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
 178 };
 179
 180 struct kmemtrace_alloc_entry {
 181         struct trace_entry      ent;
 182         enum kmemtrace_type_id type_id;
 183         unsigned long call_site;
 184         const void *ptr;
 185         size_t bytes_req;
 186         size_t bytes_alloc;
 187         gfp_t gfp_flags;
 188         int node;
 189 };
 190
 191 struct kmemtrace_free_entry {
 192         struct trace_entry      ent;
 193         enum kmemtrace_type_id type_id;
 194         unsigned long call_site;
 195         const void *ptr;
 196 };
 197
 198 struct syscall_trace_enter {
 199         struct trace_entry      ent;
 200         int                     nr;
 201         unsigned long           args[];
 202 };
 203
 204 struct syscall_trace_exit {
 205         struct trace_entry      ent;
 206         int                     nr;
 207         unsigned long           ret;
 208 };
 209
 210 struct kprobe_trace_entry {
 211         struct trace_entry      ent;
 212         unsigned long           ip;
 213         int                     nargs;
 214         unsigned long           args[];
 215 };
 216
 217 #define SIZEOF_KPROBE_TRACE_ENTRY(n)                    \
 218         (offsetof(struct kprobe_trace_entry, args) +    \
 219         (sizeof(unsigned long) * (n)))
 220
 221 struct kretprobe_trace_entry {
 222         struct trace_entry      ent;
 223         unsigned long           func;
 224         unsigned long           ret_ip;
 225         int                     nargs;
 226         unsigned long           args[];
 227 };
 228
 229 #define SIZEOF_KRETPROBE_TRACE_ENTRY(n)                 \
 230         (offsetof(struct kretprobe_trace_entry, args) + \
 231         (sizeof(unsigned long) * (n)))
 232
 233
 234
 235 /*
 236  * trace_flag_type is an enumeration that holds different
 237  * states when a trace occurs. These are:
 238  *  IRQS_OFF            - interrupts were disabled
 239  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 240  *  NEED_RESCED         - reschedule is requested
 241  *  HARDIRQ             - inside an interrupt handler
 242  *  SOFTIRQ             - inside a softirq handler
 243  */
 244 enum trace_flag_type {
 245         TRACE_FLAG_IRQS_OFF             = 0x01,
 246         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 247         TRACE_FLAG_NEED_RESCHED         = 0x04,
 248         TRACE_FLAG_HARDIRQ              = 0x08,
 249         TRACE_FLAG_SOFTIRQ              = 0x10,
 250 };
 251
 252 #define TRACE_BUF_SIZE          1024
 253
 254 /*
 255  * The CPU trace array - it consists of thousands of trace entries
 256  * plus some other descriptor data: (for example which task started
 257  * the trace, etc.)
 258  */
 259 struct trace_array_cpu {
 260         atomic_t                disabled;
 261         void                    *buffer_page;   /* ring buffer spare */
 262
 263         /* these fields get copied into max-trace: */
 264         unsigned long           trace_idx;
 265         unsigned long           overrun;
 266         unsigned long           saved_latency;
 267         unsigned long           critical_start;
 268         unsigned long           critical_end;
 269         unsigned long           critical_sequence;
 270         unsigned long           nice;
 271         unsigned long           policy;
 272         unsigned long           rt_priority;
 273         cycle_t                 preempt_timestamp;
 274         pid_t                   pid;
 275         uid_t                   uid;
 276         char                    comm[TASK_COMM_LEN];
 277 };
 278
 279 /*
 280  * The trace array - an array of per-CPU trace arrays. This is the
 281  * highest level data structure that individual tracers deal with.
 282  * They have on/off state as well:
 283  */
 284 struct trace_array {
 285         struct ring_buffer      *buffer;
 286         unsigned long           entries;
 287         int                     cpu;
 288         cycle_t                 time_start;
 289         struct task_struct      *waiter;
 290         struct trace_array_cpu  *data[NR_CPUS];
 291 };
 292
 293 #define FTRACE_CMP_TYPE(var, type) \
 294         __builtin_types_compatible_p(typeof(var), type *)
 295
 296 #undef IF_ASSIGN
 297 #define IF_ASSIGN(var, entry, etype, id)                \
 298         if (FTRACE_CMP_TYPE(var, etype)) {              \
 299                 var = (typeof(var))(entry);             \
 300                 WARN_ON(id && (entry)->type != id);     \
 301                 break;                                  \
 302         }
 303
 304 /* Will cause compile errors if type is not found. */
 305 extern void __ftrace_bad_type(void);
 306
 307 /*
 308  * The trace_assign_type is a verifier that the entry type is
 309  * the same as the type being assigned. To add new types simply
 310  * add a line with the following format:
 311  *
 312  * IF_ASSIGN(var, ent, type, id);
 313  *
 314  *  Where "type" is the trace type that includes the trace_entry
 315  *  as the "ent" item. And "id" is the trace identifier that is
 316  *  used in the trace_type enum.
 317  *
 318  *  If the type can have more than one id, then use zero.
 319  */
 320 #define trace_assign_type(var, ent)                                     \
 321         do {                                                            \
 322                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 323                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 324                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 325                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 326                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 327                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 328                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
 329                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 330                           TRACE_MMIO_RW);                               \
 331                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 332                           TRACE_MMIO_MAP);                              \
 333                 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
 334                 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
 335                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 336                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 337                           TRACE_GRAPH_ENT);             \
 338                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 339                           TRACE_GRAPH_RET);             \
 340                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
 341                 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
 342                 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
 343                           TRACE_KMEM_ALLOC);    \
 344                 IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
 345                           TRACE_KMEM_FREE);     \
 346                 IF_ASSIGN(var, ent, struct kprobe_trace_entry,          \
 347                           TRACE_KPROBE);                                \
 348                 IF_ASSIGN(var, ent, struct kretprobe_trace_entry,       \
 349                           TRACE_KRETPROBE);                             \
 350                 __ftrace_bad_type();                                    \
 351         } while (0)
 352
 353 /*
 354  * An option specific to a tracer. This is a boolean value.
 355  * The bit is the bit index that sets its value on the
 356  * flags value in struct tracer_flags.
 357  */
 358 struct tracer_opt {
 359         const char      *name; /* Will appear on the trace_options file */
 360         u32             bit; /* Mask assigned in val field in tracer_flags */
 361 };
 362
 363 /*
 364  * The set of specific options for a tracer. Your tracer
 365  * have to set the initial value of the flags val.
 366  */
 367 struct tracer_flags {
 368         u32                     val;
 369         struct tracer_opt       *opts;
 370 };
 371
 372 /* Makes more easy to define a tracer opt */
 373 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 374
 375
 376 /**
 377  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 378  * @name: the name chosen to select it on the available_tracers file
 379  * @init: called when one switches to this tracer (echo name > current_tracer)
 380  * @reset: called when one switches to another tracer
 381  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 382  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 383  * @open: called when the trace file is opened
 384  * @pipe_open: called when the trace_pipe file is opened
 385  * @wait_pipe: override how the user waits for traces on trace_pipe
 386  * @close: called when the trace file is released
 387  * @read: override the default read callback on trace_pipe
 388  * @splice_read: override the default splice_read callback on trace_pipe
 389  * @selftest: selftest to run on boot (see trace_selftest.c)
 390  * @print_headers: override the first lines that describe your columns
 391  * @print_line: callback that prints a trace
 392  * @set_flag: signals one of your private flags changed (trace_options file)
 393  * @flags: your private flags
 394  */
 395 struct tracer {
 396         const char              *name;
 397         int                     (*init)(struct trace_array *tr);
 398         void                    (*reset)(struct trace_array *tr);
 399         void                    (*start)(struct trace_array *tr);
 400         void                    (*stop)(struct trace_array *tr);
 401         void                    (*open)(struct trace_iterator *iter);
 402         void                    (*pipe_open)(struct trace_iterator *iter);
 403         void                    (*wait_pipe)(struct trace_iterator *iter);
 404         void                    (*close)(struct trace_iterator *iter);
 405         ssize_t                 (*read)(struct trace_iterator *iter,
 406                                         struct file *filp, char __user *ubuf,
 407                                         size_t cnt, loff_t *ppos);
 408         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 409                                                struct file *filp,
 410                                                loff_t *ppos,
 411                                                struct pipe_inode_info *pipe,
 412                                                size_t len,
 413                                                unsigned int flags);
 414 #ifdef CONFIG_FTRACE_STARTUP_TEST
 415         int                     (*selftest)(struct tracer *trace,
 416                                             struct trace_array *tr);
 417 #endif
 418         void                    (*print_header)(struct seq_file *m);
 419         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 420         /* If you handled the flag setting, return 0 */
 421         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 422         struct tracer           *next;
 423         int                     print_max;
 424         struct tracer_flags     *flags;
 425         struct tracer_stat      *stats;
 426 };
 427
 428
 429 #define TRACE_PIPE_ALL_CPU      -1
 430
 431 int tracer_init(struct tracer *t, struct trace_array *tr);
 432 int tracing_is_enabled(void);
 433 void trace_wake_up(void);
 434 void tracing_reset(struct trace_array *tr, int cpu);
 435 void tracing_reset_online_cpus(struct trace_array *tr);
 436 void tracing_reset_current(int cpu);
 437 void tracing_reset_current_online_cpus(void);
 438 int tracing_open_generic(struct inode *inode, struct file *filp);
 439 struct dentry *trace_create_file(const char *name,
 440                                  mode_t mode,
 441                                  struct dentry *parent,
 442                                  void *data,
 443                                  const struct file_operations *fops);
 444
 445 struct dentry *tracing_init_dentry(void);
 446 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 447
 448 struct ring_buffer_event;
 449
 450 struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
 451                                                     int type,
 452                                                     unsigned long len,
 453                                                     unsigned long flags,
 454                                                     int pc);
 455 void trace_buffer_unlock_commit(struct trace_array *tr,
 456                                 struct ring_buffer_event *event,
 457                                 unsigned long flags, 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 default_wait_pipe(struct trace_iterator *iter);
 466 void poll_wait_pipe(struct trace_iterator *iter);
 467
 468 void ftrace(struct trace_array *tr,
 469                             struct trace_array_cpu *data,
 470                             unsigned long ip,
 471                             unsigned long parent_ip,
 472                             unsigned long flags, int pc);
 473 void tracing_sched_switch_trace(struct trace_array *tr,
 474                                 struct task_struct *prev,
 475                                 struct task_struct *next,
 476                                 unsigned long flags, int pc);
 477
 478 void tracing_sched_wakeup_trace(struct trace_array *tr,
 479                                 struct task_struct *wakee,
 480                                 struct task_struct *cur,
 481                                 unsigned long flags, int pc);
 482 void trace_special(struct trace_array *tr,
 483                    struct trace_array_cpu *data,
 484                    unsigned long arg1,
 485                    unsigned long arg2,
 486                    unsigned long arg3, int pc);
 487 void trace_function(struct trace_array *tr,
 488                     unsigned long ip,
 489                     unsigned long parent_ip,
 490                     unsigned long flags, int pc);
 491
 492 void trace_graph_return(struct ftrace_graph_ret *trace);
 493 int trace_graph_entry(struct ftrace_graph_ent *trace);
 494 void set_graph_array(struct trace_array *tr);
 495
 496 void tracing_start_cmdline_record(void);
 497 void tracing_stop_cmdline_record(void);
 498 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 499 void tracing_stop_sched_switch_record(void);
 500 void tracing_start_sched_switch_record(void);
 501 int register_tracer(struct tracer *type);
 502 void unregister_tracer(struct tracer *type);
 503
 504 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 505
 506 extern unsigned long tracing_max_latency;
 507 extern unsigned long tracing_thresh;
 508
 509 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 510 void update_max_tr_single(struct trace_array *tr,
 511                           struct task_struct *tsk, int cpu);
 512
 513 #ifdef CONFIG_STACKTRACE
 514 void ftrace_trace_stack(struct trace_array *tr, unsigned long flags,
 515                         int skip, int pc);
 516
 517 void ftrace_trace_userstack(struct trace_array *tr, unsigned long flags,
 518                             int pc);
 519
 520 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 521                    int pc);
 522 #else
 523 static inline void ftrace_trace_stack(struct trace_array *tr,
 524                                       unsigned long flags, int skip, int pc)
 525 {
 526 }
 527
 528 static inline void ftrace_trace_userstack(struct trace_array *tr,
 529                                           unsigned long flags, int pc)
 530 {
 531 }
 532
 533 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 534                                  int skip, int pc)
 535 {
 536 }
 537 #endif /* CONFIG_STACKTRACE */
 538
 539 extern cycle_t ftrace_now(int cpu);
 540
 541 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 542 typedef void
 543 (*tracer_switch_func_t)(void *private,
 544                         void *__rq,
 545                         struct task_struct *prev,
 546                         struct task_struct *next);
 547
 548 struct tracer_switch_ops {
 549         tracer_switch_func_t            func;
 550         void                            *private;
 551         struct tracer_switch_ops        *next;
 552 };
 553 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 554
 555 extern void trace_find_cmdline(int pid, char comm[]);
 556
 557 #ifdef CONFIG_DYNAMIC_FTRACE
 558 extern unsigned long ftrace_update_tot_cnt;
 559 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 560 extern int DYN_FTRACE_TEST_NAME(void);
 561 #endif
 562
 563 extern int ring_buffer_expanded;
 564 extern bool tracing_selftest_disabled;
 565 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
 566
 567 #ifdef CONFIG_FTRACE_STARTUP_TEST
 568 extern int trace_selftest_startup_function(struct tracer *trace,
 569                                            struct trace_array *tr);
 570 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 571                                                  struct trace_array *tr);
 572 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 573                                           struct trace_array *tr);
 574 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 575                                              struct trace_array *tr);
 576 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 577                                                  struct trace_array *tr);
 578 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 579                                          struct trace_array *tr);
 580 extern int trace_selftest_startup_nop(struct tracer *trace,
 581                                          struct trace_array *tr);
 582 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 583                                                struct trace_array *tr);
 584 extern int trace_selftest_startup_sysprof(struct tracer *trace,
 585                                                struct trace_array *tr);
 586 extern int trace_selftest_startup_branch(struct tracer *trace,
 587                                          struct trace_array *tr);
 588 extern int trace_selftest_startup_hw_branches(struct tracer *trace,
 589                                               struct trace_array *tr);
 590 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 591
 592 extern void *head_page(struct trace_array_cpu *data);
 593 extern unsigned long long ns2usecs(cycle_t nsec);
 594 extern int
 595 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 596 extern int
 597 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 598
 599 extern unsigned long trace_flags;
 600
 601 extern int trace_clock_id;
 602
 603 /* Standard output formatting function used for function return traces */
 604 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 605 extern enum print_line_t print_graph_function(struct trace_iterator *iter);
 606 extern enum print_line_t
 607 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 608
 609 #ifdef CONFIG_DYNAMIC_FTRACE
 610 /* TODO: make this variable */
 611 #define FTRACE_GRAPH_MAX_FUNCS          32
 612 extern int ftrace_graph_count;
 613 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 614
 615 static inline int ftrace_graph_addr(unsigned long addr)
 616 {
 617         int i;
 618
 619         if (!ftrace_graph_count || test_tsk_trace_graph(current))
 620                 return 1;
 621
 622         for (i = 0; i < ftrace_graph_count; i++) {
 623                 if (addr == ftrace_graph_funcs[i])
 624                         return 1;
 625         }
 626
 627         return 0;
 628 }
 629 #else
 630 static inline int ftrace_trace_addr(unsigned long addr)
 631 {
 632         return 1;
 633 }
 634 static inline int ftrace_graph_addr(unsigned long addr)
 635 {
 636         return 1;
 637 }
 638 #endif /* CONFIG_DYNAMIC_FTRACE */
 639 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 640 static inline enum print_line_t
 641 print_graph_function(struct trace_iterator *iter)
 642 {
 643         return TRACE_TYPE_UNHANDLED;
 644 }
 645 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 646
 647 extern struct pid *ftrace_pid_trace;
 648
 649 #ifdef CONFIG_FUNCTION_TRACER
 650 static inline int ftrace_trace_task(struct task_struct *task)
 651 {
 652         if (!ftrace_pid_trace)
 653                 return 1;
 654
 655         return test_tsk_trace_trace(task);
 656 }
 657 #else
 658 static inline int ftrace_trace_task(struct task_struct *task)
 659 {
 660         return 1;
 661 }
 662 #endif
 663
 664 /*
 665  * trace_iterator_flags is an enumeration that defines bit
 666  * positions into trace_flags that controls the output.
 667  *
 668  * NOTE: These bits must match the trace_options array in
 669  *       trace.c.
 670  */
 671 enum trace_iterator_flags {
 672         TRACE_ITER_PRINT_PARENT         = 0x01,
 673         TRACE_ITER_SYM_OFFSET           = 0x02,
 674         TRACE_ITER_SYM_ADDR             = 0x04,
 675         TRACE_ITER_VERBOSE              = 0x08,
 676         TRACE_ITER_RAW                  = 0x10,
 677         TRACE_ITER_HEX                  = 0x20,
 678         TRACE_ITER_BIN                  = 0x40,
 679         TRACE_ITER_BLOCK                = 0x80,
 680         TRACE_ITER_STACKTRACE           = 0x100,
 681         TRACE_ITER_SCHED_TREE           = 0x200,
 682         TRACE_ITER_PRINTK               = 0x400,
 683         TRACE_ITER_PREEMPTONLY          = 0x800,
 684         TRACE_ITER_BRANCH               = 0x1000,
 685         TRACE_ITER_ANNOTATE             = 0x2000,
 686         TRACE_ITER_USERSTACKTRACE       = 0x4000,
 687         TRACE_ITER_SYM_USEROBJ          = 0x8000,
 688         TRACE_ITER_PRINTK_MSGONLY       = 0x10000,
 689         TRACE_ITER_CONTEXT_INFO         = 0x20000, /* Print pid/cpu/time */
 690         TRACE_ITER_LATENCY_FMT          = 0x40000,
 691         TRACE_ITER_SLEEP_TIME           = 0x80000,
 692         TRACE_ITER_GRAPH_TIME           = 0x100000,
 693 };
 694
 695 /*
 696  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 697  * control the output of kernel symbols.
 698  */
 699 #define TRACE_ITER_SYM_MASK \
 700         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 701
 702 extern struct tracer nop_trace;
 703
 704 /**
 705  * ftrace_preempt_disable - disable preemption scheduler safe
 706  *
 707  * When tracing can happen inside the scheduler, there exists
 708  * cases that the tracing might happen before the need_resched
 709  * flag is checked. If this happens and the tracer calls
 710  * preempt_enable (after a disable), a schedule might take place
 711  * causing an infinite recursion.
 712  *
 713  * To prevent this, we read the need_resched flag before
 714  * disabling preemption. When we want to enable preemption we
 715  * check the flag, if it is set, then we call preempt_enable_no_resched.
 716  * Otherwise, we call preempt_enable.
 717  *
 718  * The rational for doing the above is that if need_resched is set
 719  * and we have yet to reschedule, we are either in an atomic location
 720  * (where we do not need to check for scheduling) or we are inside
 721  * the scheduler and do not want to resched.
 722  */
 723 static inline int ftrace_preempt_disable(void)
 724 {
 725         int resched;
 726
 727         resched = need_resched();
 728         preempt_disable_notrace();
 729
 730         return resched;
 731 }
 732
 733 /**
 734  * ftrace_preempt_enable - enable preemption scheduler safe
 735  * @resched: the return value from ftrace_preempt_disable
 736  *
 737  * This is a scheduler safe way to enable preemption and not miss
 738  * any preemption checks. The disabled saved the state of preemption.
 739  * If resched is set, then we are either inside an atomic or
 740  * are inside the scheduler (we would have already scheduled
 741  * otherwise). In this case, we do not want to call normal
 742  * preempt_enable, but preempt_enable_no_resched instead.
 743  */
 744 static inline void ftrace_preempt_enable(int resched)
 745 {
 746         if (resched)
 747                 preempt_enable_no_resched_notrace();
 748         else
 749                 preempt_enable_notrace();
 750 }
 751
 752 #ifdef CONFIG_BRANCH_TRACER
 753 extern int enable_branch_tracing(struct trace_array *tr);
 754 extern void disable_branch_tracing(void);
 755 static inline int trace_branch_enable(struct trace_array *tr)
 756 {
 757         if (trace_flags & TRACE_ITER_BRANCH)
 758                 return enable_branch_tracing(tr);
 759         return 0;
 760 }
 761 static inline void trace_branch_disable(void)
 762 {
 763         /* due to races, always disable */
 764         disable_branch_tracing();
 765 }
 766 #else
 767 static inline int trace_branch_enable(struct trace_array *tr)
 768 {
 769         return 0;
 770 }
 771 static inline void trace_branch_disable(void)
 772 {
 773 }
 774 #endif /* CONFIG_BRANCH_TRACER */
 775
 776 /* set ring buffers to default size if not already done so */
 777 int tracing_update_buffers(void);
 778
 779 /* trace event type bit fields, not numeric */
 780 enum {
 781         TRACE_EVENT_TYPE_PRINTF         = 1,
 782         TRACE_EVENT_TYPE_RAW            = 2,
 783 };
 784
 785 struct ftrace_event_field {
 786         struct list_head        link;
 787         char                    *name;
 788         char                    *type;
 789         int                     filter_type;
 790         int                     offset;
 791         int                     size;
 792         int                     is_signed;
 793 };
 794
 795 struct event_filter {
 796         int                     n_preds;
 797         struct filter_pred      **preds;
 798         char                    *filter_string;
 799         bool                    no_reset;
 800 };
 801
 802 struct event_subsystem {
 803         struct list_head        list;
 804         const char              *name;
 805         struct dentry           *entry;
 806         struct event_filter     *filter;
 807         int                     nr_events;
 808 };
 809
 810 struct filter_pred;
 811
 812 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
 813                                  int val1, int val2);
 814
 815 struct filter_pred {
 816         filter_pred_fn_t fn;
 817         u64 val;
 818         char str_val[MAX_FILTER_STR_VAL];
 819         int str_len;
 820         char *field_name;
 821         int offset;
 822         int not;
 823         int op;
 824         int pop_n;
 825 };
 826
 827 extern void print_event_filter(struct ftrace_event_call *call,
 828                                struct trace_seq *s);
 829 extern int apply_event_filter(struct ftrace_event_call *call,
 830                               char *filter_string);
 831 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 832                                         char *filter_string);
 833 extern void print_subsystem_event_filter(struct event_subsystem *system,
 834                                          struct trace_seq *s);
 835 extern int filter_assign_type(const char *type);
 836
 837 static inline int
 838 filter_check_discard(struct ftrace_event_call *call, void *rec,
 839                      struct ring_buffer *buffer,
 840                      struct ring_buffer_event *event)
 841 {
 842         if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
 843                 ring_buffer_discard_commit(buffer, event);
 844                 return 1;
 845         }
 846
 847         return 0;
 848 }
 849
 850 #define DEFINE_COMPARISON_PRED(type)                                    \
 851 static int filter_pred_##type(struct filter_pred *pred, void *event,    \
 852                               int val1, int val2)                       \
 853 {                                                                       \
 854         type *addr = (type *)(event + pred->offset);                    \
 855         type val = (type)pred->val;                                     \
 856         int match = 0;                                                  \
 857                                                                         \
 858         switch (pred->op) {                                             \
 859         case OP_LT:                                                     \
 860                 match = (*addr < val);                                  \
 861                 break;                                                  \
 862         case OP_LE:                                                     \
 863                 match = (*addr <= val);                                 \
 864                 break;                                                  \
 865         case OP_GT:                                                     \
 866                 match = (*addr > val);                                  \
 867                 break;                                                  \
 868         case OP_GE:                                                     \
 869                 match = (*addr >= val);                                 \
 870                 break;                                                  \
 871         default:                                                        \
 872                 break;                                                  \
 873         }                                                               \
 874                                                                         \
 875         return match;                                                   \
 876 }
 877
 878 #define DEFINE_EQUALITY_PRED(size)                                      \
 879 static int filter_pred_##size(struct filter_pred *pred, void *event,    \
 880                               int val1, int val2)                       \
 881 {                                                                       \
 882         u##size *addr = (u##size *)(event + pred->offset);              \
 883         u##size val = (u##size)pred->val;                               \
 884         int match;                                                      \
 885                                                                         \
 886         match = (val == *addr) ^ pred->not;                             \
 887                                                                         \
 888         return match;                                                   \
 889 }
 890
 891 extern struct mutex event_mutex;
 892 extern struct list_head ftrace_events;
 893
 894 extern const char *__start___trace_bprintk_fmt[];
 895 extern const char *__stop___trace_bprintk_fmt[];
 896
 897 #undef TRACE_EVENT_FORMAT
 898 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 899         extern struct ftrace_event_call event_##call;
 900 #undef TRACE_EVENT_FORMAT_NOFILTER
 901 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
 902 #include "trace_event_types.h"
 903
 904 #endif /* _LINUX_KERNEL_TRACE_H */