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 <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 #ifdef CONFIG_KSYM_TRACER
  19 #include <asm/hw_breakpoint.h>
  20 #endif
  21
  22 enum trace_type {
  23         __TRACE_FIRST_TYPE = 0,
  24
  25         TRACE_FN,
  26         TRACE_CTX,
  27         TRACE_WAKE,
  28         TRACE_STACK,
  29         TRACE_PRINT,
  30         TRACE_BPRINT,
  31         TRACE_SPECIAL,
  32         TRACE_MMIO_RW,
  33         TRACE_MMIO_MAP,
  34         TRACE_BRANCH,
  35         TRACE_BOOT_CALL,
  36         TRACE_BOOT_RET,
  37         TRACE_GRAPH_RET,
  38         TRACE_GRAPH_ENT,
  39         TRACE_USER_STACK,
  40         TRACE_HW_BRANCHES,
  41         TRACE_KMEM_ALLOC,
  42         TRACE_KMEM_FREE,
  43         TRACE_POWER,
  44         TRACE_BLK,
  45         TRACE_KSYM,
  46
  47         __TRACE_LAST_TYPE,
  48 };
  49
  50 /*
  51  * Function trace entry - function address and parent function addres:
  52  */
  53 struct ftrace_entry {
  54         struct trace_entry      ent;
  55         unsigned long           ip;
  56         unsigned long           parent_ip;
  57 };
  58
  59 /* Function call entry */
  60 struct ftrace_graph_ent_entry {
  61         struct trace_entry              ent;
  62         struct ftrace_graph_ent         graph_ent;
  63 };
  64
  65 /* Function return entry */
  66 struct ftrace_graph_ret_entry {
  67         struct trace_entry              ent;
  68         struct ftrace_graph_ret         ret;
  69 };
  70 extern struct tracer boot_tracer;
  71
  72 /*
  73  * Context switch trace entry - which task (and prio) we switched from/to:
  74  */
  75 struct ctx_switch_entry {
  76         struct trace_entry      ent;
  77         unsigned int            prev_pid;
  78         unsigned char           prev_prio;
  79         unsigned char           prev_state;
  80         unsigned int            next_pid;
  81         unsigned char           next_prio;
  82         unsigned char           next_state;
  83         unsigned int            next_cpu;
  84 };
  85
  86 /*
  87  * Special (free-form) trace entry:
  88  */
  89 struct special_entry {
  90         struct trace_entry      ent;
  91         unsigned long           arg1;
  92         unsigned long           arg2;
  93         unsigned long           arg3;
  94 };
  95
  96 /*
  97  * Stack-trace entry:
  98  */
  99
 100 #define FTRACE_STACK_ENTRIES    8
 101
 102 struct stack_entry {
 103         struct trace_entry      ent;
 104         unsigned long           caller[FTRACE_STACK_ENTRIES];
 105 };
 106
 107 struct userstack_entry {
 108         struct trace_entry      ent;
 109         unsigned long           caller[FTRACE_STACK_ENTRIES];
 110 };
 111
 112 /*
 113  * trace_printk entry:
 114  */
 115 struct bprint_entry {
 116         struct trace_entry      ent;
 117         unsigned long           ip;
 118         const char              *fmt;
 119         u32                     buf[];
 120 };
 121
 122 struct print_entry {
 123         struct trace_entry      ent;
 124         unsigned long           ip;
 125         char                    buf[];
 126 };
 127
 128 #define TRACE_OLD_SIZE          88
 129
 130 struct trace_field_cont {
 131         unsigned char           type;
 132         /* Temporary till we get rid of this completely */
 133         char                    buf[TRACE_OLD_SIZE - 1];
 134 };
 135
 136 struct trace_mmiotrace_rw {
 137         struct trace_entry      ent;
 138         struct mmiotrace_rw     rw;
 139 };
 140
 141 struct trace_mmiotrace_map {
 142         struct trace_entry      ent;
 143         struct mmiotrace_map    map;
 144 };
 145
 146 struct trace_boot_call {
 147         struct trace_entry      ent;
 148         struct boot_trace_call boot_call;
 149 };
 150
 151 struct trace_boot_ret {
 152         struct trace_entry      ent;
 153         struct boot_trace_ret boot_ret;
 154 };
 155
 156 #define TRACE_FUNC_SIZE 30
 157 #define TRACE_FILE_SIZE 20
 158 struct trace_branch {
 159         struct trace_entry      ent;
 160         unsigned                line;
 161         char                    func[TRACE_FUNC_SIZE+1];
 162         char                    file[TRACE_FILE_SIZE+1];
 163         char                    correct;
 164 };
 165
 166 struct hw_branch_entry {
 167         struct trace_entry      ent;
 168         u64                     from;
 169         u64                     to;
 170 };
 171
 172 struct trace_power {
 173         struct trace_entry      ent;
 174         struct power_trace      state_data;
 175 };
 176
 177 enum kmemtrace_type_id {
 178         KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
 179         KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
 180         KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
 181 };
 182
 183 struct kmemtrace_alloc_entry {
 184         struct trace_entry      ent;
 185         enum kmemtrace_type_id type_id;
 186         unsigned long call_site;
 187         const void *ptr;
 188         size_t bytes_req;
 189         size_t bytes_alloc;
 190         gfp_t gfp_flags;
 191         int node;
 192 };
 193
 194 struct kmemtrace_free_entry {
 195         struct trace_entry      ent;
 196         enum kmemtrace_type_id type_id;
 197         unsigned long call_site;
 198         const void *ptr;
 199 };
 200
 201 struct syscall_trace_enter {
 202         struct trace_entry      ent;
 203         int                     nr;
 204         unsigned long           args[];
 205 };
 206
 207 struct syscall_trace_exit {
 208         struct trace_entry      ent;
 209         int                     nr;
 210         unsigned long           ret;
 211 };
 212
 213 #define KSYM_SELFTEST_ENTRY "ksym_selftest_dummy"
 214 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
 215
 216 struct ksym_trace_entry {
 217         struct trace_entry      ent;
 218         unsigned long           ip;
 219         unsigned char           type;
 220         char                    ksym_name[KSYM_NAME_LEN];
 221         char                    cmd[TASK_COMM_LEN];
 222 };
 223
 224 /*
 225  * trace_flag_type is an enumeration that holds different
 226  * states when a trace occurs. These are:
 227  *  IRQS_OFF            - interrupts were disabled
 228  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 229  *  NEED_RESCED         - reschedule is requested
 230  *  HARDIRQ             - inside an interrupt handler
 231  *  SOFTIRQ             - inside a softirq handler
 232  */
 233 enum trace_flag_type {
 234         TRACE_FLAG_IRQS_OFF             = 0x01,
 235         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 236         TRACE_FLAG_NEED_RESCHED         = 0x04,
 237         TRACE_FLAG_HARDIRQ              = 0x08,
 238         TRACE_FLAG_SOFTIRQ              = 0x10,
 239 };
 240
 241 #define TRACE_BUF_SIZE          1024
 242
 243 /*
 244  * The CPU trace array - it consists of thousands of trace entries
 245  * plus some other descriptor data: (for example which task started
 246  * the trace, etc.)
 247  */
 248 struct trace_array_cpu {
 249         atomic_t                disabled;
 250         void                    *buffer_page;   /* ring buffer spare */
 251
 252         unsigned long           saved_latency;
 253         unsigned long           critical_start;
 254         unsigned long           critical_end;
 255         unsigned long           critical_sequence;
 256         unsigned long           nice;
 257         unsigned long           policy;
 258         unsigned long           rt_priority;
 259         unsigned long           skipped_entries;
 260         cycle_t                 preempt_timestamp;
 261         pid_t                   pid;
 262         uid_t                   uid;
 263         char                    comm[TASK_COMM_LEN];
 264 };
 265
 266 /*
 267  * The trace array - an array of per-CPU trace arrays. This is the
 268  * highest level data structure that individual tracers deal with.
 269  * They have on/off state as well:
 270  */
 271 struct trace_array {
 272         struct ring_buffer      *buffer;
 273         unsigned long           entries;
 274         int                     cpu;
 275         cycle_t                 time_start;
 276         struct task_struct      *waiter;
 277         struct trace_array_cpu  *data[NR_CPUS];
 278 };
 279
 280 #define FTRACE_CMP_TYPE(var, type) \
 281         __builtin_types_compatible_p(typeof(var), type *)
 282
 283 #undef IF_ASSIGN
 284 #define IF_ASSIGN(var, entry, etype, id)                \
 285         if (FTRACE_CMP_TYPE(var, etype)) {              \
 286                 var = (typeof(var))(entry);             \
 287                 WARN_ON(id && (entry)->type != id);     \
 288                 break;                                  \
 289         }
 290
 291 /* Will cause compile errors if type is not found. */
 292 extern void __ftrace_bad_type(void);
 293
 294 /*
 295  * The trace_assign_type is a verifier that the entry type is
 296  * the same as the type being assigned. To add new types simply
 297  * add a line with the following format:
 298  *
 299  * IF_ASSIGN(var, ent, type, id);
 300  *
 301  *  Where "type" is the trace type that includes the trace_entry
 302  *  as the "ent" item. And "id" is the trace identifier that is
 303  *  used in the trace_type enum.
 304  *
 305  *  If the type can have more than one id, then use zero.
 306  */
 307 #define trace_assign_type(var, ent)                                     \
 308         do {                                                            \
 309                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 310                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 311                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 312                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 313                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 314                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 315                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
 316                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 317                           TRACE_MMIO_RW);                               \
 318                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 319                           TRACE_MMIO_MAP);                              \
 320                 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
 321                 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
 322                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 323                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 324                           TRACE_GRAPH_ENT);             \
 325                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 326                           TRACE_GRAPH_RET);             \
 327                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
 328                 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
 329                 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
 330                           TRACE_KMEM_ALLOC);    \
 331                 IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
 332                           TRACE_KMEM_FREE);     \
 333                 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
 334                 __ftrace_bad_type();                                    \
 335         } while (0)
 336
 337 /*
 338  * An option specific to a tracer. This is a boolean value.
 339  * The bit is the bit index that sets its value on the
 340  * flags value in struct tracer_flags.
 341  */
 342 struct tracer_opt {
 343         const char      *name; /* Will appear on the trace_options file */
 344         u32             bit; /* Mask assigned in val field in tracer_flags */
 345 };
 346
 347 /*
 348  * The set of specific options for a tracer. Your tracer
 349  * have to set the initial value of the flags val.
 350  */
 351 struct tracer_flags {
 352         u32                     val;
 353         struct tracer_opt       *opts;
 354 };
 355
 356 /* Makes more easy to define a tracer opt */
 357 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 358
 359
 360 /**
 361  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 362  * @name: the name chosen to select it on the available_tracers file
 363  * @init: called when one switches to this tracer (echo name > current_tracer)
 364  * @reset: called when one switches to another tracer
 365  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 366  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 367  * @open: called when the trace file is opened
 368  * @pipe_open: called when the trace_pipe file is opened
 369  * @wait_pipe: override how the user waits for traces on trace_pipe
 370  * @close: called when the trace file is released
 371  * @read: override the default read callback on trace_pipe
 372  * @splice_read: override the default splice_read callback on trace_pipe
 373  * @selftest: selftest to run on boot (see trace_selftest.c)
 374  * @print_headers: override the first lines that describe your columns
 375  * @print_line: callback that prints a trace
 376  * @set_flag: signals one of your private flags changed (trace_options file)
 377  * @flags: your private flags
 378  */
 379 struct tracer {
 380         const char              *name;
 381         int                     (*init)(struct trace_array *tr);
 382         void                    (*reset)(struct trace_array *tr);
 383         void                    (*start)(struct trace_array *tr);
 384         void                    (*stop)(struct trace_array *tr);
 385         void                    (*open)(struct trace_iterator *iter);
 386         void                    (*pipe_open)(struct trace_iterator *iter);
 387         void                    (*wait_pipe)(struct trace_iterator *iter);
 388         void                    (*close)(struct trace_iterator *iter);
 389         ssize_t                 (*read)(struct trace_iterator *iter,
 390                                         struct file *filp, char __user *ubuf,
 391                                         size_t cnt, loff_t *ppos);
 392         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 393                                                struct file *filp,
 394                                                loff_t *ppos,
 395                                                struct pipe_inode_info *pipe,
 396                                                size_t len,
 397                                                unsigned int flags);
 398 #ifdef CONFIG_FTRACE_STARTUP_TEST
 399         int                     (*selftest)(struct tracer *trace,
 400                                             struct trace_array *tr);
 401 #endif
 402         void                    (*print_header)(struct seq_file *m);
 403         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 404         /* If you handled the flag setting, return 0 */
 405         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 406         struct tracer           *next;
 407         int                     print_max;
 408         struct tracer_flags     *flags;
 409         struct tracer_stat      *stats;
 410 };
 411
 412
 413 #define TRACE_PIPE_ALL_CPU      -1
 414
 415 int tracer_init(struct tracer *t, struct trace_array *tr);
 416 int tracing_is_enabled(void);
 417 void trace_wake_up(void);
 418 void tracing_reset(struct trace_array *tr, int cpu);
 419 void tracing_reset_online_cpus(struct trace_array *tr);
 420 void tracing_reset_current(int cpu);
 421 void tracing_reset_current_online_cpus(void);
 422 int tracing_open_generic(struct inode *inode, struct file *filp);
 423 struct dentry *trace_create_file(const char *name,
 424                                  mode_t mode,
 425                                  struct dentry *parent,
 426                                  void *data,
 427                                  const struct file_operations *fops);
 428
 429 struct dentry *tracing_init_dentry(void);
 430 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 431
 432 struct ring_buffer_event;
 433
 434 struct ring_buffer_event *
 435 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 436                           int type,
 437                           unsigned long len,
 438                           unsigned long flags,
 439                           int pc);
 440 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 441                                 struct ring_buffer_event *event,
 442                                 unsigned long flags, int pc);
 443
 444 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 445                                                 struct trace_array_cpu *data);
 446
 447 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 448                                           int *ent_cpu, u64 *ent_ts);
 449
 450 void default_wait_pipe(struct trace_iterator *iter);
 451 void poll_wait_pipe(struct trace_iterator *iter);
 452
 453 void ftrace(struct trace_array *tr,
 454                             struct trace_array_cpu *data,
 455                             unsigned long ip,
 456                             unsigned long parent_ip,
 457                             unsigned long flags, int pc);
 458 void tracing_sched_switch_trace(struct trace_array *tr,
 459                                 struct task_struct *prev,
 460                                 struct task_struct *next,
 461                                 unsigned long flags, int pc);
 462
 463 void tracing_sched_wakeup_trace(struct trace_array *tr,
 464                                 struct task_struct *wakee,
 465                                 struct task_struct *cur,
 466                                 unsigned long flags, int pc);
 467 void trace_special(struct trace_array *tr,
 468                    struct trace_array_cpu *data,
 469                    unsigned long arg1,
 470                    unsigned long arg2,
 471                    unsigned long arg3, int pc);
 472 void trace_function(struct trace_array *tr,
 473                     unsigned long ip,
 474                     unsigned long parent_ip,
 475                     unsigned long flags, int pc);
 476
 477 void trace_graph_return(struct ftrace_graph_ret *trace);
 478 int trace_graph_entry(struct ftrace_graph_ent *trace);
 479 void set_graph_array(struct trace_array *tr);
 480
 481 void tracing_start_cmdline_record(void);
 482 void tracing_stop_cmdline_record(void);
 483 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 484 void tracing_stop_sched_switch_record(void);
 485 void tracing_start_sched_switch_record(void);
 486 int register_tracer(struct tracer *type);
 487 void unregister_tracer(struct tracer *type);
 488
 489 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 490
 491 #ifdef CONFIG_TRACER_MAX_TRACE
 492 extern unsigned long tracing_max_latency;
 493 extern unsigned long tracing_thresh;
 494
 495 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 496 void update_max_tr_single(struct trace_array *tr,
 497                           struct task_struct *tsk, int cpu);
 498 #endif /* CONFIG_TRACER_MAX_TRACE */
 499
 500 #ifdef CONFIG_STACKTRACE
 501 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 502                         int skip, int pc);
 503
 504 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 505                             int pc);
 506
 507 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 508                    int pc);
 509 #else
 510 static inline void ftrace_trace_stack(struct trace_array *tr,
 511                                       unsigned long flags, int skip, int pc)
 512 {
 513 }
 514
 515 static inline void ftrace_trace_userstack(struct trace_array *tr,
 516                                           unsigned long flags, int pc)
 517 {
 518 }
 519
 520 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 521                                  int skip, int pc)
 522 {
 523 }
 524 #endif /* CONFIG_STACKTRACE */
 525
 526 extern cycle_t ftrace_now(int cpu);
 527
 528 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 529 typedef void
 530 (*tracer_switch_func_t)(void *private,
 531                         void *__rq,
 532                         struct task_struct *prev,
 533                         struct task_struct *next);
 534
 535 struct tracer_switch_ops {
 536         tracer_switch_func_t            func;
 537         void                            *private;
 538         struct tracer_switch_ops        *next;
 539 };
 540 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 541
 542 extern void trace_find_cmdline(int pid, char comm[]);
 543
 544 #ifdef CONFIG_DYNAMIC_FTRACE
 545 extern unsigned long ftrace_update_tot_cnt;
 546 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 547 extern int DYN_FTRACE_TEST_NAME(void);
 548 #endif
 549
 550 extern int ring_buffer_expanded;
 551 extern bool tracing_selftest_disabled;
 552 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
 553
 554 #ifdef CONFIG_FTRACE_STARTUP_TEST
 555 extern int trace_selftest_startup_function(struct tracer *trace,
 556                                            struct trace_array *tr);
 557 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 558                                                  struct trace_array *tr);
 559 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 560                                           struct trace_array *tr);
 561 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 562                                              struct trace_array *tr);
 563 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 564                                                  struct trace_array *tr);
 565 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 566                                          struct trace_array *tr);
 567 extern int trace_selftest_startup_nop(struct tracer *trace,
 568                                          struct trace_array *tr);
 569 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 570                                                struct trace_array *tr);
 571 extern int trace_selftest_startup_sysprof(struct tracer *trace,
 572                                                struct trace_array *tr);
 573 extern int trace_selftest_startup_branch(struct tracer *trace,
 574                                          struct trace_array *tr);
 575 extern int trace_selftest_startup_hw_branches(struct tracer *trace,
 576                                               struct trace_array *tr);
 577 extern int trace_selftest_startup_ksym(struct tracer *trace,
 578                                          struct trace_array *tr);
 579 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 580
 581 extern void *head_page(struct trace_array_cpu *data);
 582 extern unsigned long long ns2usecs(cycle_t nsec);
 583 extern int
 584 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 585 extern int
 586 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 587 extern int
 588 trace_array_vprintk(struct trace_array *tr,
 589                     unsigned long ip, const char *fmt, va_list args);
 590 int trace_array_printk(struct trace_array *tr,
 591                        unsigned long ip, const char *fmt, ...);
 592
 593 extern unsigned long trace_flags;
 594
 595 extern int trace_clock_id;
 596
 597 /* Standard output formatting function used for function return traces */
 598 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 599 extern enum print_line_t print_graph_function(struct trace_iterator *iter);
 600 extern enum print_line_t
 601 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 602
 603 #ifdef CONFIG_DYNAMIC_FTRACE
 604 /* TODO: make this variable */
 605 #define FTRACE_GRAPH_MAX_FUNCS          32
 606 extern int ftrace_graph_count;
 607 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 608
 609 static inline int ftrace_graph_addr(unsigned long addr)
 610 {
 611         int i;
 612
 613         if (!ftrace_graph_count || test_tsk_trace_graph(current))
 614                 return 1;
 615
 616         for (i = 0; i < ftrace_graph_count; i++) {
 617                 if (addr == ftrace_graph_funcs[i])
 618                         return 1;
 619         }
 620
 621         return 0;
 622 }
 623 #else
 624 static inline int ftrace_trace_addr(unsigned long addr)
 625 {
 626         return 1;
 627 }
 628 static inline int ftrace_graph_addr(unsigned long addr)
 629 {
 630         return 1;
 631 }
 632 #endif /* CONFIG_DYNAMIC_FTRACE */
 633 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 634 static inline enum print_line_t
 635 print_graph_function(struct trace_iterator *iter)
 636 {
 637         return TRACE_TYPE_UNHANDLED;
 638 }
 639 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 640
 641 extern struct pid *ftrace_pid_trace;
 642
 643 #ifdef CONFIG_FUNCTION_TRACER
 644 static inline int ftrace_trace_task(struct task_struct *task)
 645 {
 646         if (!ftrace_pid_trace)
 647                 return 1;
 648
 649         return test_tsk_trace_trace(task);
 650 }
 651 #else
 652 static inline int ftrace_trace_task(struct task_struct *task)
 653 {
 654         return 1;
 655 }
 656 #endif
 657
 658 /*
 659  * trace_iterator_flags is an enumeration that defines bit
 660  * positions into trace_flags that controls the output.
 661  *
 662  * NOTE: These bits must match the trace_options array in
 663  *       trace.c.
 664  */
 665 enum trace_iterator_flags {
 666         TRACE_ITER_PRINT_PARENT         = 0x01,
 667         TRACE_ITER_SYM_OFFSET           = 0x02,
 668         TRACE_ITER_SYM_ADDR             = 0x04,
 669         TRACE_ITER_VERBOSE              = 0x08,
 670         TRACE_ITER_RAW                  = 0x10,
 671         TRACE_ITER_HEX                  = 0x20,
 672         TRACE_ITER_BIN                  = 0x40,
 673         TRACE_ITER_BLOCK                = 0x80,
 674         TRACE_ITER_STACKTRACE           = 0x100,
 675         TRACE_ITER_SCHED_TREE           = 0x200,
 676         TRACE_ITER_PRINTK               = 0x400,
 677         TRACE_ITER_PREEMPTONLY          = 0x800,
 678         TRACE_ITER_BRANCH               = 0x1000,
 679         TRACE_ITER_ANNOTATE             = 0x2000,
 680         TRACE_ITER_USERSTACKTRACE       = 0x4000,
 681         TRACE_ITER_SYM_USEROBJ          = 0x8000,
 682         TRACE_ITER_PRINTK_MSGONLY       = 0x10000,
 683         TRACE_ITER_CONTEXT_INFO         = 0x20000, /* Print pid/cpu/time */
 684         TRACE_ITER_LATENCY_FMT          = 0x40000,
 685         TRACE_ITER_SLEEP_TIME           = 0x80000,
 686         TRACE_ITER_GRAPH_TIME           = 0x100000,
 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 /**
 699  * ftrace_preempt_disable - disable preemption scheduler safe
 700  *
 701  * When tracing can happen inside the scheduler, there exists
 702  * cases that the tracing might happen before the need_resched
 703  * flag is checked. If this happens and the tracer calls
 704  * preempt_enable (after a disable), a schedule might take place
 705  * causing an infinite recursion.
 706  *
 707  * To prevent this, we read the need_resched flag before
 708  * disabling preemption. When we want to enable preemption we
 709  * check the flag, if it is set, then we call preempt_enable_no_resched.
 710  * Otherwise, we call preempt_enable.
 711  *
 712  * The rational for doing the above is that if need_resched is set
 713  * and we have yet to reschedule, we are either in an atomic location
 714  * (where we do not need to check for scheduling) or we are inside
 715  * the scheduler and do not want to resched.
 716  */
 717 static inline int ftrace_preempt_disable(void)
 718 {
 719         int resched;
 720
 721         resched = need_resched();
 722         preempt_disable_notrace();
 723
 724         return resched;
 725 }
 726
 727 /**
 728  * ftrace_preempt_enable - enable preemption scheduler safe
 729  * @resched: the return value from ftrace_preempt_disable
 730  *
 731  * This is a scheduler safe way to enable preemption and not miss
 732  * any preemption checks. The disabled saved the state of preemption.
 733  * If resched is set, then we are either inside an atomic or
 734  * are inside the scheduler (we would have already scheduled
 735  * otherwise). In this case, we do not want to call normal
 736  * preempt_enable, but preempt_enable_no_resched instead.
 737  */
 738 static inline void ftrace_preempt_enable(int resched)
 739 {
 740         if (resched)
 741                 preempt_enable_no_resched_notrace();
 742         else
 743                 preempt_enable_notrace();
 744 }
 745
 746 #ifdef CONFIG_BRANCH_TRACER
 747 extern int enable_branch_tracing(struct trace_array *tr);
 748 extern void disable_branch_tracing(void);
 749 static inline int trace_branch_enable(struct trace_array *tr)
 750 {
 751         if (trace_flags & TRACE_ITER_BRANCH)
 752                 return enable_branch_tracing(tr);
 753         return 0;
 754 }
 755 static inline void trace_branch_disable(void)
 756 {
 757         /* due to races, always disable */
 758         disable_branch_tracing();
 759 }
 760 #else
 761 static inline int trace_branch_enable(struct trace_array *tr)
 762 {
 763         return 0;
 764 }
 765 static inline void trace_branch_disable(void)
 766 {
 767 }
 768 #endif /* CONFIG_BRANCH_TRACER */
 769
 770 /* set ring buffers to default size if not already done so */
 771 int tracing_update_buffers(void);
 772
 773 /* trace event type bit fields, not numeric */
 774 enum {
 775         TRACE_EVENT_TYPE_PRINTF         = 1,
 776         TRACE_EVENT_TYPE_RAW            = 2,
 777 };
 778
 779 struct ftrace_event_field {
 780         struct list_head        link;
 781         char                    *name;
 782         char                    *type;
 783         int                     filter_type;
 784         int                     offset;
 785         int                     size;
 786         int                     is_signed;
 787 };
 788
 789 struct event_filter {
 790         int                     n_preds;
 791         struct filter_pred      **preds;
 792         char                    *filter_string;
 793         bool                    no_reset;
 794 };
 795
 796 struct event_subsystem {
 797         struct list_head        list;
 798         const char              *name;
 799         struct dentry           *entry;
 800         struct event_filter     *filter;
 801         int                     nr_events;
 802 };
 803
 804 struct filter_pred;
 805
 806 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
 807                                  int val1, int val2);
 808
 809 struct filter_pred {
 810         filter_pred_fn_t fn;
 811         u64 val;
 812         char str_val[MAX_FILTER_STR_VAL];
 813         int str_len;
 814         char *field_name;
 815         int offset;
 816         int not;
 817         int op;
 818         int pop_n;
 819 };
 820
 821 extern void print_event_filter(struct ftrace_event_call *call,
 822                                struct trace_seq *s);
 823 extern int apply_event_filter(struct ftrace_event_call *call,
 824                               char *filter_string);
 825 extern int apply_subsystem_event_filter(struct event_subsystem *system,
 826                                         char *filter_string);
 827 extern void print_subsystem_event_filter(struct event_subsystem *system,
 828                                          struct trace_seq *s);
 829 extern int filter_assign_type(const char *type);
 830
 831 static inline int
 832 filter_check_discard(struct ftrace_event_call *call, void *rec,
 833                      struct ring_buffer *buffer,
 834                      struct ring_buffer_event *event)
 835 {
 836         if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
 837                 ring_buffer_discard_commit(buffer, event);
 838                 return 1;
 839         }
 840
 841         return 0;
 842 }
 843
 844 #define DEFINE_COMPARISON_PRED(type)                                    \
 845 static int filter_pred_##type(struct filter_pred *pred, void *event,    \
 846                               int val1, int val2)                       \
 847 {                                                                       \
 848         type *addr = (type *)(event + pred->offset);                    \
 849         type val = (type)pred->val;                                     \
 850         int match = 0;                                                  \
 851                                                                         \
 852         switch (pred->op) {                                             \
 853         case OP_LT:                                                     \
 854                 match = (*addr < val);                                  \
 855                 break;                                                  \
 856         case OP_LE:                                                     \
 857                 match = (*addr <= val);                                 \
 858                 break;                                                  \
 859         case OP_GT:                                                     \
 860                 match = (*addr > val);                                  \
 861                 break;                                                  \
 862         case OP_GE:                                                     \
 863                 match = (*addr >= val);                                 \
 864                 break;                                                  \
 865         default:                                                        \
 866                 break;                                                  \
 867         }                                                               \
 868                                                                         \
 869         return match;                                                   \
 870 }
 871
 872 #define DEFINE_EQUALITY_PRED(size)                                      \
 873 static int filter_pred_##size(struct filter_pred *pred, void *event,    \
 874                               int val1, int val2)                       \
 875 {                                                                       \
 876         u##size *addr = (u##size *)(event + pred->offset);              \
 877         u##size val = (u##size)pred->val;                               \
 878         int match;                                                      \
 879                                                                         \
 880         match = (val == *addr) ^ pred->not;                             \
 881                                                                         \
 882         return match;                                                   \
 883 }
 884
 885 extern struct mutex event_mutex;
 886 extern struct list_head ftrace_events;
 887
 888 extern const char *__start___trace_bprintk_fmt[];
 889 extern const char *__stop___trace_bprintk_fmt[];
 890
 891 #undef TRACE_EVENT_FORMAT
 892 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
 893         extern struct ftrace_event_call event_##call;
 894 #undef TRACE_EVENT_FORMAT_NOFILTER
 895 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
 896 #include "trace_event_types.h"
 897
 898 #endif /* _LINUX_KERNEL_TRACE_H */