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 #ifdef CONFIG_MT65XX_TRACER
  16 #include <mach/mt_mon.h>
  17 #endif
  18
  19 #ifdef CONFIG_FTRACE_SYSCALLS
  20 #include <asm/unistd.h>         /* For NR_SYSCALLS           */
  21 #include <asm/syscall.h>        /* some archs define it here */
  22 #endif
  23
  24 enum trace_type {
  25         __TRACE_FIRST_TYPE = 0,
  26
  27         TRACE_FN,
  28         TRACE_CTX,
  29         TRACE_WAKE,
  30         TRACE_STACK,
  31         TRACE_PRINT,
  32         TRACE_BPRINT,
  33         TRACE_MMIO_RW,
  34         TRACE_MMIO_MAP,
  35         TRACE_BRANCH,
  36         TRACE_GRAPH_RET,
  37         TRACE_GRAPH_ENT,
  38         TRACE_USER_STACK,
  39         TRACE_BLK,
  40         TRACE_BPUTS,
  41     TRACE_MT65XX_MON_TYPE,
  42
  43         __TRACE_LAST_TYPE,
  44 };
  45
  46
  47 #undef __field
  48 #define __field(type, item)             type    item;
  49
  50 #undef __field_struct
  51 #define __field_struct(type, item)      __field(type, item)
  52
  53 #undef __field_desc
  54 #define __field_desc(type, container, item)
  55
  56 #undef __array
  57 #define __array(type, item, size)       type    item[size];
  58
  59 #undef __array_desc
  60 #define __array_desc(type, container, item, size)
  61
  62 #undef __dynamic_array
  63 #define __dynamic_array(type, item)     type    item[];
  64
  65 #undef F_STRUCT
  66 #define F_STRUCT(args...)               args
  67
  68 #undef FTRACE_ENTRY
  69 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
  70         struct struct_name {                                            \
  71                 struct trace_entry      ent;                            \
  72                 tstruct                                                 \
  73         }
  74
  75 #undef TP_ARGS
  76 #define TP_ARGS(args...)        args
  77
  78 #undef FTRACE_ENTRY_DUP
  79 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
  80
  81 #undef FTRACE_ENTRY_REG
  82 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
  83                          filter, regfn) \
  84         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
  85                      filter)
  86
  87 #include "trace_entries.h"
  88
  89 /*
  90  * syscalls are special, and need special handling, this is why
  91  * they are not included in trace_entries.h
  92  */
  93 struct syscall_trace_enter {
  94         struct trace_entry      ent;
  95         int                     nr;
  96         unsigned long           args[];
  97 };
  98
  99 struct syscall_trace_exit {
 100         struct trace_entry      ent;
 101         int                     nr;
 102         long                    ret;
 103 };
 104
 105 struct kprobe_trace_entry_head {
 106         struct trace_entry      ent;
 107         unsigned long           ip;
 108 };
 109
 110 struct kretprobe_trace_entry_head {
 111         struct trace_entry      ent;
 112         unsigned long           func;
 113         unsigned long           ret_ip;
 114 };
 115
 116 /*
 117  * trace_flag_type is an enumeration that holds different
 118  * states when a trace occurs. These are:
 119  *  IRQS_OFF            - interrupts were disabled
 120  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 121  *  NEED_RESCHED        - reschedule is requested
 122  *  HARDIRQ             - inside an interrupt handler
 123  *  SOFTIRQ             - inside a softirq handler
 124  */
 125 enum trace_flag_type {
 126         TRACE_FLAG_IRQS_OFF             = 0x01,
 127         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 128         TRACE_FLAG_NEED_RESCHED         = 0x04,
 129         TRACE_FLAG_HARDIRQ              = 0x08,
 130         TRACE_FLAG_SOFTIRQ              = 0x10,
 131 };
 132
 133 #define TRACE_BUF_SIZE          1024
 134
 135 struct trace_array;
 136
 137 struct trace_cpu {
 138         struct trace_array      *tr;
 139         struct dentry           *dir;
 140         int                     cpu;
 141 };
 142
 143 /*
 144  * The CPU trace array - it consists of thousands of trace entries
 145  * plus some other descriptor data: (for example which task started
 146  * the trace, etc.)
 147  */
 148 struct trace_array_cpu {
 149         struct trace_cpu        trace_cpu;
 150         atomic_t                disabled;
 151         void                    *buffer_page;   /* ring buffer spare */
 152
 153         unsigned long           entries;
 154         unsigned long           saved_latency;
 155         unsigned long           critical_start;
 156         unsigned long           critical_end;
 157         unsigned long           critical_sequence;
 158         unsigned long           nice;
 159         unsigned long           policy;
 160         unsigned long           rt_priority;
 161         unsigned long           skipped_entries;
 162         cycle_t                 preempt_timestamp;
 163         pid_t                   pid;
 164         kuid_t                  uid;
 165         char                    comm[TASK_COMM_LEN];
 166 };
 167
 168 struct tracer;
 169
 170 struct trace_buffer {
 171         struct trace_array              *tr;
 172         struct ring_buffer              *buffer;
 173         struct trace_array_cpu __percpu *data;
 174         cycle_t                         time_start;
 175         int                             cpu;
 176 };
 177
 178 /*
 179  * The trace array - an array of per-CPU trace arrays. This is the
 180  * highest level data structure that individual tracers deal with.
 181  * They have on/off state as well:
 182  */
 183 struct trace_array {
 184         struct list_head        list;
 185         char                    *name;
 186         struct trace_buffer     trace_buffer;
 187 #ifdef CONFIG_TRACER_MAX_TRACE
 188         /*
 189          * The max_buffer is used to snapshot the trace when a maximum
 190          * latency is reached, or when the user initiates a snapshot.
 191          * Some tracers will use this to store a maximum trace while
 192          * it continues examining live traces.
 193          *
 194          * The buffers for the max_buffer are set up the same as the trace_buffer
 195          * When a snapshot is taken, the buffer of the max_buffer is swapped
 196          * with the buffer of the trace_buffer and the buffers are reset for
 197          * the trace_buffer so the tracing can continue.
 198          */
 199         struct trace_buffer     max_buffer;
 200         bool                    allocated_snapshot;
 201 #endif
 202         int                     buffer_disabled;
 203         struct trace_cpu        trace_cpu;      /* place holder */
 204 #ifdef CONFIG_FTRACE_SYSCALLS
 205         int                     sys_refcount_enter;
 206         int                     sys_refcount_exit;
 207         DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
 208         DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
 209 #endif
 210         int                     stop_count;
 211         int                     clock_id;
 212         struct tracer           *current_trace;
 213         unsigned int            flags;
 214         raw_spinlock_t          start_lock;
 215         struct dentry           *dir;
 216         struct dentry           *options;
 217         struct dentry           *percpu_dir;
 218         struct dentry           *event_dir;
 219         struct list_head        systems;
 220         struct list_head        events;
 221         struct task_struct      *waiter;
 222         int                     ref;
 223 };
 224
 225 enum {
 226         TRACE_ARRAY_FL_GLOBAL   = (1 << 0)
 227 };
 228
 229 extern struct list_head ftrace_trace_arrays;
 230
 231 extern struct mutex trace_types_lock;
 232
 233 extern int trace_array_get(struct trace_array *tr);
 234 extern void trace_array_put(struct trace_array *tr);
 235
 236 /*
 237  * The global tracer (top) should be the first trace array added,
 238  * but we check the flag anyway.
 239  */
 240 static inline struct trace_array *top_trace_array(void)
 241 {
 242         struct trace_array *tr;
 243
 244         tr = list_entry(ftrace_trace_arrays.prev,
 245                         typeof(*tr), list);
 246         WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
 247         return tr;
 248 }
 249
 250 #define FTRACE_CMP_TYPE(var, type) \
 251         __builtin_types_compatible_p(typeof(var), type *)
 252
 253 #undef IF_ASSIGN
 254 #define IF_ASSIGN(var, entry, etype, id)                \
 255         if (FTRACE_CMP_TYPE(var, etype)) {              \
 256                 var = (typeof(var))(entry);             \
 257                 WARN_ON(id && (entry)->type != id);     \
 258                 break;                                  \
 259         }
 260
 261 /* Will cause compile errors if type is not found. */
 262 extern void __ftrace_bad_type(void);
 263
 264 /*
 265  * The trace_assign_type is a verifier that the entry type is
 266  * the same as the type being assigned. To add new types simply
 267  * add a line with the following format:
 268  *
 269  * IF_ASSIGN(var, ent, type, id);
 270  *
 271  *  Where "type" is the trace type that includes the trace_entry
 272  *  as the "ent" item. And "id" is the trace identifier that is
 273  *  used in the trace_type enum.
 274  *
 275  *  If the type can have more than one id, then use zero.
 276  */
 277 #define trace_assign_type(var, ent)                                     \
 278         do {                                                            \
 279                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 280                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 281                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 282                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 283                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 284                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 285                 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS);   \
 286                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 287                           TRACE_MMIO_RW);                               \
 288                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 289                           TRACE_MMIO_MAP);                              \
 290                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 291                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 292                           TRACE_GRAPH_ENT);             \
 293                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 294                           TRACE_GRAPH_RET);             \
 295         IF_ASSIGN(var, ent, struct mt65xx_mon_entry, \
 296                 TRACE_MT65XX_MON_TYPE); \
 297                 __ftrace_bad_type();                                    \
 298         } while (0)
 299
 300 /*
 301  * An option specific to a tracer. This is a boolean value.
 302  * The bit is the bit index that sets its value on the
 303  * flags value in struct tracer_flags.
 304  */
 305 struct tracer_opt {
 306         const char      *name; /* Will appear on the trace_options file */
 307         u32             bit; /* Mask assigned in val field in tracer_flags */
 308 };
 309
 310 /*
 311  * The set of specific options for a tracer. Your tracer
 312  * have to set the initial value of the flags val.
 313  */
 314 struct tracer_flags {
 315         u32                     val;
 316         struct tracer_opt       *opts;
 317 };
 318
 319 /* Makes more easy to define a tracer opt */
 320 #define TRACER_OPT(s, b)        .name = #s, .bit = b
 321
 322
 323 /**
 324  * struct tracer - a specific tracer and its callbacks to interact with debugfs
 325  * @name: the name chosen to select it on the available_tracers file
 326  * @init: called when one switches to this tracer (echo name > current_tracer)
 327  * @reset: called when one switches to another tracer
 328  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 329  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 330  * @open: called when the trace file is opened
 331  * @pipe_open: called when the trace_pipe file is opened
 332  * @wait_pipe: override how the user waits for traces on trace_pipe
 333  * @close: called when the trace file is released
 334  * @pipe_close: called when the trace_pipe file is released
 335  * @read: override the default read callback on trace_pipe
 336  * @splice_read: override the default splice_read callback on trace_pipe
 337  * @selftest: selftest to run on boot (see trace_selftest.c)
 338  * @print_headers: override the first lines that describe your columns
 339  * @print_line: callback that prints a trace
 340  * @set_flag: signals one of your private flags changed (trace_options file)
 341  * @flags: your private flags
 342  */
 343 struct tracer {
 344         const char              *name;
 345         int                     (*init)(struct trace_array *tr);
 346         void                    (*reset)(struct trace_array *tr);
 347         void                    (*start)(struct trace_array *tr);
 348         void                    (*stop)(struct trace_array *tr);
 349         void                    (*open)(struct trace_iterator *iter);
 350         void                    (*pipe_open)(struct trace_iterator *iter);
 351         int                     (*wait_pipe)(struct trace_iterator *iter);
 352         void                    (*close)(struct trace_iterator *iter);
 353         void                    (*pipe_close)(struct trace_iterator *iter);
 354         ssize_t                 (*read)(struct trace_iterator *iter,
 355                                         struct file *filp, char __user *ubuf,
 356                                         size_t cnt, loff_t *ppos);
 357         ssize_t                 (*splice_read)(struct trace_iterator *iter,
 358                                                struct file *filp,
 359                                                loff_t *ppos,
 360                                                struct pipe_inode_info *pipe,
 361                                                size_t len,
 362                                                unsigned int flags);
 363 #ifdef CONFIG_FTRACE_STARTUP_TEST
 364         int                     (*selftest)(struct tracer *trace,
 365                                             struct trace_array *tr);
 366 #endif
 367         void                    (*print_header)(struct seq_file *m);
 368         enum print_line_t       (*print_line)(struct trace_iterator *iter);
 369         /* If you handled the flag setting, return 0 */
 370         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 371         /* Return 0 if OK with change, else return non-zero */
 372         int                     (*flag_changed)(struct tracer *tracer,
 373                                                 u32 mask, int set);
 374         struct tracer           *next;
 375         struct tracer_flags     *flags;
 376         bool                    print_max;
 377         bool                    enabled;
 378 #ifdef CONFIG_TRACER_MAX_TRACE
 379         bool                    use_max_tr;
 380 #endif
 381 };
 382
 383
 384 /* Only current can touch trace_recursion */
 385
 386 /*
 387  * For function tracing recursion:
 388  *  The order of these bits are important.
 389  *
 390  *  When function tracing occurs, the following steps are made:
 391  *   If arch does not support a ftrace feature:
 392  *    call internal function (uses INTERNAL bits) which calls...
 393  *   If callback is registered to the "global" list, the list
 394  *    function is called and recursion checks the GLOBAL bits.
 395  *    then this function calls...
 396  *   The function callback, which can use the FTRACE bits to
 397  *    check for recursion.
 398  *
 399  * Now if the arch does not suppport a feature, and it calls
 400  * the global list function which calls the ftrace callback
 401  * all three of these steps will do a recursion protection.
 402  * There's no reason to do one if the previous caller already
 403  * did. The recursion that we are protecting against will
 404  * go through the same steps again.
 405  *
 406  * To prevent the multiple recursion checks, if a recursion
 407  * bit is set that is higher than the MAX bit of the current
 408  * check, then we know that the check was made by the previous
 409  * caller, and we can skip the current check.
 410  */
 411 enum {
 412         TRACE_BUFFER_BIT,
 413         TRACE_BUFFER_NMI_BIT,
 414         TRACE_BUFFER_IRQ_BIT,
 415         TRACE_BUFFER_SIRQ_BIT,
 416
 417         /* Start of function recursion bits */
 418         TRACE_FTRACE_BIT,
 419         TRACE_FTRACE_NMI_BIT,
 420         TRACE_FTRACE_IRQ_BIT,
 421         TRACE_FTRACE_SIRQ_BIT,
 422
 423         /* GLOBAL_BITs must be greater than FTRACE_BITs */
 424         TRACE_GLOBAL_BIT,
 425         TRACE_GLOBAL_NMI_BIT,
 426         TRACE_GLOBAL_IRQ_BIT,
 427         TRACE_GLOBAL_SIRQ_BIT,
 428
 429         /* INTERNAL_BITs must be greater than GLOBAL_BITs */
 430         TRACE_INTERNAL_BIT,
 431         TRACE_INTERNAL_NMI_BIT,
 432         TRACE_INTERNAL_IRQ_BIT,
 433         TRACE_INTERNAL_SIRQ_BIT,
 434
 435         TRACE_CONTROL_BIT,
 436
 437         TRACE_BRANCH_BIT,
 438 /*
 439  * Abuse of the trace_recursion.
 440  * As we need a way to maintain state if we are tracing the function
 441  * graph in irq because we want to trace a particular function that
 442  * was called in irq context but we have irq tracing off. Since this
 443  * can only be modified by current, we can reuse trace_recursion.
 444  */
 445         TRACE_IRQ_BIT,
 446 };
 447
 448 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (1<<(bit)); } while (0)
 449 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
 450 #define trace_recursion_test(bit)       ((current)->trace_recursion & (1<<(bit)))
 451
 452 #define TRACE_CONTEXT_BITS      4
 453
 454 #define TRACE_FTRACE_START      TRACE_FTRACE_BIT
 455 #define TRACE_FTRACE_MAX        ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
 456
 457 #define TRACE_GLOBAL_START      TRACE_GLOBAL_BIT
 458 #define TRACE_GLOBAL_MAX        ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
 459
 460 #define TRACE_LIST_START        TRACE_INTERNAL_BIT
 461 #define TRACE_LIST_MAX          ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
 462
 463 #define TRACE_CONTEXT_MASK      TRACE_LIST_MAX
 464
 465 static __always_inline int trace_get_context_bit(void)
 466 {
 467         int bit;
 468
 469         if (in_interrupt()) {
 470                 if (in_nmi())
 471                         bit = 0;
 472
 473                 else if (in_irq())
 474                         bit = 1;
 475                 else
 476                         bit = 2;
 477         } else
 478                 bit = 3;
 479
 480         return bit;
 481 }
 482
 483 static __always_inline int trace_test_and_set_recursion(int start, int max)
 484 {
 485         unsigned int val = current->trace_recursion;
 486         int bit;
 487
 488         /* A previous recursion check was made */
 489         if ((val & TRACE_CONTEXT_MASK) > max)
 490                 return 0;
 491
 492         bit = trace_get_context_bit() + start;
 493         if (unlikely(val & (1 << bit)))
 494                 return -1;
 495
 496         val |= 1 << bit;
 497         current->trace_recursion = val;
 498         barrier();
 499
 500         return bit;
 501 }
 502
 503 static __always_inline void trace_clear_recursion(int bit)
 504 {
 505         unsigned int val = current->trace_recursion;
 506
 507         if (!bit)
 508                 return;
 509
 510         bit = 1 << bit;
 511         val &= ~bit;
 512
 513         barrier();
 514         current->trace_recursion = val;
 515 }
 516
 517 static inline struct ring_buffer_iter *
 518 trace_buffer_iter(struct trace_iterator *iter, int cpu)
 519 {
 520         if (iter->buffer_iter && iter->buffer_iter[cpu])
 521                 return iter->buffer_iter[cpu];
 522         return NULL;
 523 }
 524
 525 int tracer_init(struct tracer *t, struct trace_array *tr);
 526 int tracing_is_enabled(void);
 527 void tracing_reset(struct trace_buffer *buf, int cpu);
 528 void tracing_reset_online_cpus(struct trace_buffer *buf);
 529 void tracing_reset_current(int cpu);
 530 void tracing_reset_all_online_cpus(void);
 531 int tracing_open_generic(struct inode *inode, struct file *filp);
 532 struct dentry *trace_create_file(const char *name,
 533                                  umode_t mode,
 534                                  struct dentry *parent,
 535                                  void *data,
 536                                  const struct file_operations *fops);
 537
 538 struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
 539 struct dentry *tracing_init_dentry(void);
 540
 541 struct ring_buffer_event;
 542
 543 struct ring_buffer_event *
 544 trace_buffer_lock_reserve(struct ring_buffer *buffer,
 545                           int type,
 546                           unsigned long len,
 547                           unsigned long flags,
 548                           int pc);
 549
 550 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 551                                                 struct trace_array_cpu *data);
 552
 553 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 554                                           int *ent_cpu, u64 *ent_ts);
 555
 556 void __buffer_unlock_commit(struct ring_buffer *buffer,
 557                             struct ring_buffer_event *event);
 558
 559 int trace_empty(struct trace_iterator *iter);
 560
 561 void *trace_find_next_entry_inc(struct trace_iterator *iter);
 562
 563 void trace_init_global_iter(struct trace_iterator *iter);
 564
 565 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 566
 567 int poll_wait_pipe(struct trace_iterator *iter);
 568
 569 void ftrace(struct trace_array *tr,
 570                             struct trace_array_cpu *data,
 571                             unsigned long ip,
 572                             unsigned long parent_ip,
 573                             unsigned long flags, int pc);
 574 void tracing_sched_switch_trace(struct trace_array *tr,
 575                                 struct task_struct *prev,
 576                                 struct task_struct *next,
 577                                 unsigned long flags, int pc);
 578
 579 void tracing_sched_wakeup_trace(struct trace_array *tr,
 580                                 struct task_struct *wakee,
 581                                 struct task_struct *cur,
 582                                 unsigned long flags, int pc);
 583 void trace_function(struct trace_array *tr,
 584                     unsigned long ip,
 585                     unsigned long parent_ip,
 586                     unsigned long flags, int pc);
 587 void trace_graph_function(struct trace_array *tr,
 588                     unsigned long ip,
 589                     unsigned long parent_ip,
 590                     unsigned long flags, int pc);
 591 void trace_latency_header(struct seq_file *m);
 592 void trace_default_header(struct seq_file *m);
 593 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 594 int trace_empty(struct trace_iterator *iter);
 595
 596 void trace_graph_return(struct ftrace_graph_ret *trace);
 597 int trace_graph_entry(struct ftrace_graph_ent *trace);
 598 void set_graph_array(struct trace_array *tr);
 599
 600 void tracing_start_cmdline_record(void);
 601 void tracing_stop_cmdline_record(void);
 602 void tracing_sched_switch_assign_trace(struct trace_array *tr);
 603 void tracing_stop_sched_switch_record(void);
 604 void tracing_start_sched_switch_record(void);
 605 int register_tracer(struct tracer *type);
 606 int is_tracing_stopped(void);
 607
 608 extern cpumask_var_t __read_mostly tracing_buffer_mask;
 609
 610 #define for_each_tracing_cpu(cpu)       \
 611         for_each_cpu(cpu, tracing_buffer_mask)
 612
 613 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 614
 615 extern unsigned long tracing_thresh;
 616
 617 #ifdef CONFIG_TRACER_MAX_TRACE
 618 extern unsigned long tracing_max_latency;
 619
 620 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 621 void update_max_tr_single(struct trace_array *tr,
 622                           struct task_struct *tsk, int cpu);
 623 #endif /* CONFIG_TRACER_MAX_TRACE */
 624
 625 #ifdef CONFIG_STACKTRACE
 626 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 627                         int skip, int pc);
 628
 629 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
 630                              int skip, int pc, struct pt_regs *regs);
 631
 632 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 633                             int pc);
 634
 635 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 636                    int pc);
 637 #else
 638 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 639                                       unsigned long flags, int skip, int pc)
 640 {
 641 }
 642
 643 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
 644                                            unsigned long flags, int skip,
 645                                            int pc, struct pt_regs *regs)
 646 {
 647 }
 648
 649 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 650                                           unsigned long flags, int pc)
 651 {
 652 }
 653
 654 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 655                                  int skip, int pc)
 656 {
 657 }
 658 #endif /* CONFIG_STACKTRACE */
 659
 660 extern cycle_t ftrace_now(int cpu);
 661
 662 extern void trace_find_cmdline(int pid, char comm[]);
 663 extern int trace_find_tgid(int pid);
 664
 665 #ifdef CONFIG_DYNAMIC_FTRACE
 666 extern unsigned long ftrace_update_tot_cnt;
 667 #endif
 668 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 669 extern int DYN_FTRACE_TEST_NAME(void);
 670 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
 671 extern int DYN_FTRACE_TEST_NAME2(void);
 672
 673 extern bool ring_buffer_expanded;
 674 extern bool tracing_selftest_disabled;
 675 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 676
 677 #ifdef CONFIG_FTRACE_STARTUP_TEST
 678 extern int trace_selftest_startup_function(struct tracer *trace,
 679                                            struct trace_array *tr);
 680 extern int trace_selftest_startup_function_graph(struct tracer *trace,
 681                                                  struct trace_array *tr);
 682 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 683                                           struct trace_array *tr);
 684 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 685                                              struct trace_array *tr);
 686 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 687                                                  struct trace_array *tr);
 688 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 689                                          struct trace_array *tr);
 690 extern int trace_selftest_startup_nop(struct tracer *trace,
 691                                          struct trace_array *tr);
 692 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 693                                                struct trace_array *tr);
 694 extern int trace_selftest_startup_branch(struct tracer *trace,
 695                                          struct trace_array *tr);
 696 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 697
 698 extern void *head_page(struct trace_array_cpu *data);
 699 extern unsigned long long ns2usecs(cycle_t nsec);
 700 extern int
 701 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 702 extern int
 703 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 704 extern int
 705 trace_array_vprintk(struct trace_array *tr,
 706                     unsigned long ip, const char *fmt, va_list args);
 707 int trace_array_printk(struct trace_array *tr,
 708                        unsigned long ip, const char *fmt, ...);
 709 int trace_array_printk_buf(struct ring_buffer *buffer,
 710                            unsigned long ip, const char *fmt, ...);
 711 void trace_printk_seq(struct trace_seq *s);
 712 enum print_line_t print_trace_line(struct trace_iterator *iter);
 713
 714 extern unsigned long trace_flags;
 715
 716 /* Standard output formatting function used for function return traces */
 717 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 718
 719 /* Flag options */
 720 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
 721 #define TRACE_GRAPH_PRINT_CPU           0x2
 722 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 723 #define TRACE_GRAPH_PRINT_PROC          0x8
 724 #define TRACE_GRAPH_PRINT_DURATION      0x10
 725 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 726
 727 extern enum print_line_t
 728 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 729 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 730 extern enum print_line_t
 731 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 732 extern void graph_trace_open(struct trace_iterator *iter);
 733 extern void graph_trace_close(struct trace_iterator *iter);
 734 extern int __trace_graph_entry(struct trace_array *tr,
 735                                struct ftrace_graph_ent *trace,
 736                                unsigned long flags, int pc);
 737 extern void __trace_graph_return(struct trace_array *tr,
 738                                  struct ftrace_graph_ret *trace,
 739                                  unsigned long flags, int pc);
 740
 741
 742 #ifdef CONFIG_DYNAMIC_FTRACE
 743 /* TODO: make this variable */
 744 #define FTRACE_GRAPH_MAX_FUNCS          32
 745 extern int ftrace_graph_filter_enabled;
 746 extern int ftrace_graph_count;
 747 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 748
 749 static inline int ftrace_graph_addr(unsigned long addr)
 750 {
 751         int i;
 752
 753         if (!ftrace_graph_filter_enabled)
 754                 return 1;
 755
 756         for (i = 0; i < ftrace_graph_count; i++) {
 757                 if (addr == ftrace_graph_funcs[i]) {
 758                         /*
 759                          * If no irqs are to be traced, but a set_graph_function
 760                          * is set, and called by an interrupt handler, we still
 761                          * want to trace it.
 762                          */
 763                         if (in_irq())
 764                                 trace_recursion_set(TRACE_IRQ_BIT);
 765                         else
 766                                 trace_recursion_clear(TRACE_IRQ_BIT);
 767                         return 1;
 768                 }
 769         }
 770
 771         return 0;
 772 }
 773 #else
 774 static inline int ftrace_graph_addr(unsigned long addr)
 775 {
 776         return 1;
 777 }
 778 #endif /* CONFIG_DYNAMIC_FTRACE */
 779 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
 780 static inline enum print_line_t
 781 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 782 {
 783         return TRACE_TYPE_UNHANDLED;
 784 }
 785 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 786
 787 extern struct list_head ftrace_pids;
 788
 789 #ifdef CONFIG_FUNCTION_TRACER
 790 static inline int ftrace_trace_task(struct task_struct *task)
 791 {
 792         if (list_empty(&ftrace_pids))
 793                 return 1;
 794
 795         return test_tsk_trace_trace(task);
 796 }
 797 extern int ftrace_is_dead(void);
 798 #else
 799 static inline int ftrace_trace_task(struct task_struct *task)
 800 {
 801         return 1;
 802 }
 803 static inline int ftrace_is_dead(void) { return 0; }
 804 #endif
 805
 806 int ftrace_event_is_function(struct ftrace_event_call *call);
 807
 808 /*
 809  * struct trace_parser - servers for reading the user input separated by spaces
 810  * @cont: set if the input is not complete - no final space char was found
 811  * @buffer: holds the parsed user input
 812  * @idx: user input length
 813  * @size: buffer size
 814  */
 815 struct trace_parser {
 816         bool            cont;
 817         char            *buffer;
 818         unsigned        idx;
 819         unsigned        size;
 820 };
 821
 822 static inline bool trace_parser_loaded(struct trace_parser *parser)
 823 {
 824         return (parser->idx != 0);
 825 }
 826
 827 static inline bool trace_parser_cont(struct trace_parser *parser)
 828 {
 829         return parser->cont;
 830 }
 831
 832 static inline void trace_parser_clear(struct trace_parser *parser)
 833 {
 834         parser->cont = false;
 835         parser->idx = 0;
 836 }
 837
 838 extern int trace_parser_get_init(struct trace_parser *parser, int size);
 839 extern void trace_parser_put(struct trace_parser *parser);
 840 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 841         size_t cnt, loff_t *ppos);
 842
 843 /*
 844  * trace_iterator_flags is an enumeration that defines bit
 845  * positions into trace_flags that controls the output.
 846  *
 847  * NOTE: These bits must match the trace_options array in
 848  *       trace.c.
 849  */
 850 enum trace_iterator_flags {
 851         TRACE_ITER_PRINT_PARENT         = 0x01,
 852         TRACE_ITER_SYM_OFFSET           = 0x02,
 853         TRACE_ITER_SYM_ADDR             = 0x04,
 854         TRACE_ITER_VERBOSE              = 0x08,
 855         TRACE_ITER_RAW                  = 0x10,
 856         TRACE_ITER_HEX                  = 0x20,
 857         TRACE_ITER_BIN                  = 0x40,
 858         TRACE_ITER_BLOCK                = 0x80,
 859         TRACE_ITER_STACKTRACE           = 0x100,
 860         TRACE_ITER_PRINTK               = 0x200,
 861         TRACE_ITER_PREEMPTONLY          = 0x400,
 862         TRACE_ITER_BRANCH               = 0x800,
 863         TRACE_ITER_ANNOTATE             = 0x1000,
 864         TRACE_ITER_USERSTACKTRACE       = 0x2000,
 865         TRACE_ITER_SYM_USEROBJ          = 0x4000,
 866         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 867         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 868         TRACE_ITER_LATENCY_FMT          = 0x20000,
 869         TRACE_ITER_SLEEP_TIME           = 0x40000,
 870         TRACE_ITER_GRAPH_TIME           = 0x80000,
 871         TRACE_ITER_RECORD_CMD           = 0x100000,
 872         TRACE_ITER_OVERWRITE            = 0x200000,
 873         TRACE_ITER_STOP_ON_FREE         = 0x400000,
 874         TRACE_ITER_IRQ_INFO             = 0x800000,
 875         TRACE_ITER_MARKERS              = 0x1000000,
 876         TRACE_ITER_FUNCTION             = 0x2000000,
 877         TRACE_ITER_TGID                 = 0x4000000,
 878 };
 879
 880 /*
 881  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 882  * control the output of kernel symbols.
 883  */
 884 #define TRACE_ITER_SYM_MASK \
 885         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 886
 887 extern struct tracer nop_trace;
 888
 889 #ifdef CONFIG_BRANCH_TRACER
 890 extern int enable_branch_tracing(struct trace_array *tr);
 891 extern void disable_branch_tracing(void);
 892 static inline int trace_branch_enable(struct trace_array *tr)
 893 {
 894         if (trace_flags & TRACE_ITER_BRANCH)
 895                 return enable_branch_tracing(tr);
 896         return 0;
 897 }
 898 static inline void trace_branch_disable(void)
 899 {
 900         /* due to races, always disable */
 901         disable_branch_tracing();
 902 }
 903 #else
 904 static inline int trace_branch_enable(struct trace_array *tr)
 905 {
 906         return 0;
 907 }
 908 static inline void trace_branch_disable(void)
 909 {
 910 }
 911 #endif /* CONFIG_BRANCH_TRACER */
 912
 913 /* set ring buffers to default size if not already done so */
 914 int tracing_update_buffers(void);
 915
 916 /* trace event type bit fields, not numeric */
 917 enum {
 918         TRACE_EVENT_TYPE_PRINTF         = 1,
 919         TRACE_EVENT_TYPE_RAW            = 2,
 920 };
 921
 922 struct ftrace_event_field {
 923         struct list_head        link;
 924         const char              *name;
 925         const char              *type;
 926         int                     filter_type;
 927         int                     offset;
 928         int                     size;
 929         int                     is_signed;
 930 };
 931
 932 struct event_filter {
 933         int                     n_preds;        /* Number assigned */
 934         int                     a_preds;        /* allocated */
 935         struct filter_pred      *preds;
 936         struct filter_pred      *root;
 937         char                    *filter_string;
 938 };
 939
 940 struct event_subsystem {
 941         struct list_head        list;
 942         const char              *name;
 943         struct event_filter     *filter;
 944         int                     ref_count;
 945 };
 946
 947 struct ftrace_subsystem_dir {
 948         struct list_head                list;
 949         struct event_subsystem          *subsystem;
 950         struct trace_array              *tr;
 951         struct dentry                   *entry;
 952         int                             ref_count;
 953         int                             nr_events;
 954 };
 955
 956 #define FILTER_PRED_INVALID     ((unsigned short)-1)
 957 #define FILTER_PRED_IS_RIGHT    (1 << 15)
 958 #define FILTER_PRED_FOLD        (1 << 15)
 959
 960 /*
 961  * The max preds is the size of unsigned short with
 962  * two flags at the MSBs. One bit is used for both the IS_RIGHT
 963  * and FOLD flags. The other is reserved.
 964  *
 965  * 2^14 preds is way more than enough.
 966  */
 967 #define MAX_FILTER_PRED         16384
 968
 969 struct filter_pred;
 970 struct regex;
 971
 972 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
 973
 974 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 975
 976 enum regex_type {
 977         MATCH_FULL = 0,
 978         MATCH_FRONT_ONLY,
 979         MATCH_MIDDLE_ONLY,
 980         MATCH_END_ONLY,
 981 };
 982
 983 struct regex {
 984         char                    pattern[MAX_FILTER_STR_VAL];
 985         int                     len;
 986         int                     field_len;
 987         regex_match_func        match;
 988 };
 989
 990 struct filter_pred {
 991         filter_pred_fn_t        fn;
 992         u64                     val;
 993         struct regex            regex;
 994         unsigned short          *ops;
 995         struct ftrace_event_field *field;
 996         int                     offset;
 997         int                     not;
 998         int                     op;
 999         unsigned short          index;
1000         unsigned short          parent;
1001         unsigned short          left;
1002         unsigned short          right;
1003 };
1004
1005 extern enum regex_type
1006 filter_parse_regex(char *buff, int len, char **search, int *not);
1007 extern void print_event_filter(struct ftrace_event_call *call,
1008                                struct trace_seq *s);
1009 extern int apply_event_filter(struct ftrace_event_call *call,
1010                               char *filter_string);
1011 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
1012                                         char *filter_string);
1013 extern void print_subsystem_event_filter(struct event_subsystem *system,
1014                                          struct trace_seq *s);
1015 extern int filter_assign_type(const char *type);
1016
1017 struct ftrace_event_field *
1018 trace_find_event_field(struct ftrace_event_call *call, char *name);
1019
1020 static inline int
1021 filter_check_discard(struct ftrace_event_call *call, void *rec,
1022                      struct ring_buffer *buffer,
1023                      struct ring_buffer_event *event)
1024 {
1025         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
1026             !filter_match_preds(call->filter, rec)) {
1027                 ring_buffer_discard_commit(buffer, event);
1028                 return 1;
1029         }
1030
1031         return 0;
1032 }
1033
1034 extern void trace_event_enable_cmd_record(bool enable);
1035 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1036 extern int event_trace_del_tracer(struct trace_array *tr);
1037
1038 extern struct mutex event_mutex;
1039 extern struct list_head ftrace_events;
1040
1041 extern const char *__start___trace_bprintk_fmt[];
1042 extern const char *__stop___trace_bprintk_fmt[];
1043
1044 extern const char *__start___tracepoint_str[];
1045 extern const char *__stop___tracepoint_str[];
1046
1047 void trace_printk_init_buffers(void);
1048 void trace_printk_start_comm(void);
1049 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1050 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1051
1052 /*
1053  * Normal trace_printk() and friends allocates special buffers
1054  * to do the manipulation, as well as saves the print formats
1055  * into sections to display. But the trace infrastructure wants
1056  * to use these without the added overhead at the price of being
1057  * a bit slower (used mainly for warnings, where we don't care
1058  * about performance). The internal_trace_puts() is for such
1059  * a purpose.
1060  */
1061 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1062
1063 #undef FTRACE_ENTRY
1064 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
1065         extern struct ftrace_event_call                                 \
1066         __attribute__((__aligned__(4))) event_##call;
1067 #undef FTRACE_ENTRY_DUP
1068 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1069         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1070                      filter)
1071 #include "trace_entries.h"
1072
1073 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1074 int perf_ftrace_event_register(struct ftrace_event_call *call,
1075                                enum trace_reg type, void *data);
1076 #else
1077 #define perf_ftrace_event_register NULL
1078 #endif
1079
1080 #endif /* _LINUX_KERNEL_TRACE_H */