linux/kernel/trace/trace.h
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   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
  16enum trace_type {
  17        __TRACE_FIRST_TYPE = 0,
  18
  19        TRACE_FN,
  20        TRACE_CTX,
  21        TRACE_WAKE,
  22        TRACE_STACK,
  23        TRACE_PRINT,
  24        TRACE_BPRINT,
  25        TRACE_MMIO_RW,
  26        TRACE_MMIO_MAP,
  27        TRACE_BRANCH,
  28        TRACE_GRAPH_RET,
  29        TRACE_GRAPH_ENT,
  30        TRACE_USER_STACK,
  31        TRACE_BLK,
  32
  33        __TRACE_LAST_TYPE,
  34};
  35
  36
  37#undef __field
  38#define __field(type, item)             type    item;
  39
  40#undef __field_struct
  41#define __field_struct(type, item)      __field(type, item)
  42
  43#undef __field_desc
  44#define __field_desc(type, container, item)
  45
  46#undef __array
  47#define __array(type, item, size)       type    item[size];
  48
  49#undef __array_desc
  50#define __array_desc(type, container, item, size)
  51
  52#undef __dynamic_array
  53#define __dynamic_array(type, item)     type    item[];
  54
  55#undef F_STRUCT
  56#define F_STRUCT(args...)               args
  57
  58#undef FTRACE_ENTRY
  59#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
  60        struct struct_name {                                            \
  61                struct trace_entry      ent;                            \
  62                tstruct                                                 \
  63        }
  64
  65#undef TP_ARGS
  66#define TP_ARGS(args...)        args
  67
  68#undef FTRACE_ENTRY_DUP
  69#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
  70
  71#undef FTRACE_ENTRY_REG
  72#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
  73                         filter, regfn) \
  74        FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
  75                     filter)
  76
  77#include "trace_entries.h"
  78
  79/*
  80 * syscalls are special, and need special handling, this is why
  81 * they are not included in trace_entries.h
  82 */
  83struct syscall_trace_enter {
  84        struct trace_entry      ent;
  85        int                     nr;
  86        unsigned long           args[];
  87};
  88
  89struct syscall_trace_exit {
  90        struct trace_entry      ent;
  91        int                     nr;
  92        long                    ret;
  93};
  94
  95struct kprobe_trace_entry_head {
  96        struct trace_entry      ent;
  97        unsigned long           ip;
  98};
  99
 100struct kretprobe_trace_entry_head {
 101        struct trace_entry      ent;
 102        unsigned long           func;
 103        unsigned long           ret_ip;
 104};
 105
 106struct uprobe_trace_entry_head {
 107        struct trace_entry      ent;
 108        unsigned long           ip;
 109};
 110
 111/*
 112 * trace_flag_type is an enumeration that holds different
 113 * states when a trace occurs. These are:
 114 *  IRQS_OFF            - interrupts were disabled
 115 *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 116 *  NEED_RESCHED        - reschedule is requested
 117 *  HARDIRQ             - inside an interrupt handler
 118 *  SOFTIRQ             - inside a softirq handler
 119 */
 120enum trace_flag_type {
 121        TRACE_FLAG_IRQS_OFF             = 0x01,
 122        TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
 123        TRACE_FLAG_NEED_RESCHED         = 0x04,
 124        TRACE_FLAG_HARDIRQ              = 0x08,
 125        TRACE_FLAG_SOFTIRQ              = 0x10,
 126};
 127
 128#define TRACE_BUF_SIZE          1024
 129
 130/*
 131 * The CPU trace array - it consists of thousands of trace entries
 132 * plus some other descriptor data: (for example which task started
 133 * the trace, etc.)
 134 */
 135struct trace_array_cpu {
 136        atomic_t                disabled;
 137        void                    *buffer_page;   /* ring buffer spare */
 138
 139        unsigned long           entries;
 140        unsigned long           saved_latency;
 141        unsigned long           critical_start;
 142        unsigned long           critical_end;
 143        unsigned long           critical_sequence;
 144        unsigned long           nice;
 145        unsigned long           policy;
 146        unsigned long           rt_priority;
 147        unsigned long           skipped_entries;
 148        cycle_t                 preempt_timestamp;
 149        pid_t                   pid;
 150        uid_t                   uid;
 151        char                    comm[TASK_COMM_LEN];
 152};
 153
 154/*
 155 * The trace array - an array of per-CPU trace arrays. This is the
 156 * highest level data structure that individual tracers deal with.
 157 * They have on/off state as well:
 158 */
 159struct trace_array {
 160        struct ring_buffer      *buffer;
 161        int                     cpu;
 162        int                     buffer_disabled;
 163        cycle_t                 time_start;
 164        struct task_struct      *waiter;
 165        struct trace_array_cpu  *data[NR_CPUS];
 166};
 167
 168#define FTRACE_CMP_TYPE(var, type) \
 169        __builtin_types_compatible_p(typeof(var), type *)
 170
 171#undef IF_ASSIGN
 172#define IF_ASSIGN(var, entry, etype, id)                \
 173        if (FTRACE_CMP_TYPE(var, etype)) {              \
 174                var = (typeof(var))(entry);             \
 175                WARN_ON(id && (entry)->type != id);     \
 176                break;                                  \
 177        }
 178
 179/* Will cause compile errors if type is not found. */
 180extern void __ftrace_bad_type(void);
 181
 182/*
 183 * The trace_assign_type is a verifier that the entry type is
 184 * the same as the type being assigned. To add new types simply
 185 * add a line with the following format:
 186 *
 187 * IF_ASSIGN(var, ent, type, id);
 188 *
 189 *  Where "type" is the trace type that includes the trace_entry
 190 *  as the "ent" item. And "id" is the trace identifier that is
 191 *  used in the trace_type enum.
 192 *
 193 *  If the type can have more than one id, then use zero.
 194 */
 195#define trace_assign_type(var, ent)                                     \
 196        do {                                                            \
 197                IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
 198                IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
 199                IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
 200                IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 201                IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
 202                IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
 203                IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
 204                          TRACE_MMIO_RW);                               \
 205                IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
 206                          TRACE_MMIO_MAP);                              \
 207                IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 208                IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
 209                          TRACE_GRAPH_ENT);             \
 210                IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
 211                          TRACE_GRAPH_RET);             \
 212                __ftrace_bad_type();                                    \
 213        } while (0)
 214
 215/*
 216 * An option specific to a tracer. This is a boolean value.
 217 * The bit is the bit index that sets its value on the
 218 * flags value in struct tracer_flags.
 219 */
 220struct tracer_opt {
 221        const char      *name; /* Will appear on the trace_options file */
 222        u32             bit; /* Mask assigned in val field in tracer_flags */
 223};
 224
 225/*
 226 * The set of specific options for a tracer. Your tracer
 227 * have to set the initial value of the flags val.
 228 */
 229struct tracer_flags {
 230        u32                     val;
 231        struct tracer_opt       *opts;
 232};
 233
 234/* Makes more easy to define a tracer opt */
 235#define TRACER_OPT(s, b)        .name = #s, .bit = b
 236
 237
 238/**
 239 * struct tracer - a specific tracer and its callbacks to interact with debugfs
 240 * @name: the name chosen to select it on the available_tracers file
 241 * @init: called when one switches to this tracer (echo name > current_tracer)
 242 * @reset: called when one switches to another tracer
 243 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
 244 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
 245 * @open: called when the trace file is opened
 246 * @pipe_open: called when the trace_pipe file is opened
 247 * @wait_pipe: override how the user waits for traces on trace_pipe
 248 * @close: called when the trace file is released
 249 * @pipe_close: called when the trace_pipe file is released
 250 * @read: override the default read callback on trace_pipe
 251 * @splice_read: override the default splice_read callback on trace_pipe
 252 * @selftest: selftest to run on boot (see trace_selftest.c)
 253 * @print_headers: override the first lines that describe your columns
 254 * @print_line: callback that prints a trace
 255 * @set_flag: signals one of your private flags changed (trace_options file)
 256 * @flags: your private flags
 257 */
 258struct tracer {
 259        const char              *name;
 260        int                     (*init)(struct trace_array *tr);
 261        void                    (*reset)(struct trace_array *tr);
 262        void                    (*start)(struct trace_array *tr);
 263        void                    (*stop)(struct trace_array *tr);
 264        void                    (*open)(struct trace_iterator *iter);
 265        void                    (*pipe_open)(struct trace_iterator *iter);
 266        void                    (*wait_pipe)(struct trace_iterator *iter);
 267        void                    (*close)(struct trace_iterator *iter);
 268        void                    (*pipe_close)(struct trace_iterator *iter);
 269        ssize_t                 (*read)(struct trace_iterator *iter,
 270                                        struct file *filp, char __user *ubuf,
 271                                        size_t cnt, loff_t *ppos);
 272        ssize_t                 (*splice_read)(struct trace_iterator *iter,
 273                                               struct file *filp,
 274                                               loff_t *ppos,
 275                                               struct pipe_inode_info *pipe,
 276                                               size_t len,
 277                                               unsigned int flags);
 278#ifdef CONFIG_FTRACE_STARTUP_TEST
 279        int                     (*selftest)(struct tracer *trace,
 280                                            struct trace_array *tr);
 281#endif
 282        void                    (*print_header)(struct seq_file *m);
 283        enum print_line_t       (*print_line)(struct trace_iterator *iter);
 284        /* If you handled the flag setting, return 0 */
 285        int                     (*set_flag)(u32 old_flags, u32 bit, int set);
 286        struct tracer           *next;
 287        struct tracer_flags     *flags;
 288        int                     print_max;
 289        int                     use_max_tr;
 290};
 291
 292
 293/* Only current can touch trace_recursion */
 294#define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
 295#define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
 296
 297/* Ring buffer has the 10 LSB bits to count */
 298#define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
 299
 300/* for function tracing recursion */
 301#define TRACE_INTERNAL_BIT              (1<<11)
 302#define TRACE_GLOBAL_BIT                (1<<12)
 303#define TRACE_CONTROL_BIT               (1<<13)
 304
 305/*
 306 * Abuse of the trace_recursion.
 307 * As we need a way to maintain state if we are tracing the function
 308 * graph in irq because we want to trace a particular function that
 309 * was called in irq context but we have irq tracing off. Since this
 310 * can only be modified by current, we can reuse trace_recursion.
 311 */
 312#define TRACE_IRQ_BIT                   (1<<13)
 313
 314#define trace_recursion_set(bit)        do { (current)->trace_recursion |= (bit); } while (0)
 315#define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(bit); } while (0)
 316#define trace_recursion_test(bit)       ((current)->trace_recursion & (bit))
 317
 318#define TRACE_PIPE_ALL_CPU      -1
 319
 320static inline struct ring_buffer_iter *
 321trace_buffer_iter(struct trace_iterator *iter, int cpu)
 322{
 323        if (iter->buffer_iter && iter->buffer_iter[cpu])
 324                return iter->buffer_iter[cpu];
 325        return NULL;
 326}
 327
 328int tracer_init(struct tracer *t, struct trace_array *tr);
 329int tracing_is_enabled(void);
 330void trace_wake_up(void);
 331void tracing_reset(struct trace_array *tr, int cpu);
 332void tracing_reset_online_cpus(struct trace_array *tr);
 333void tracing_reset_current(int cpu);
 334void tracing_reset_current_online_cpus(void);
 335int tracing_open_generic(struct inode *inode, struct file *filp);
 336struct dentry *trace_create_file(const char *name,
 337                                 umode_t mode,
 338                                 struct dentry *parent,
 339                                 void *data,
 340                                 const struct file_operations *fops);
 341
 342struct dentry *tracing_init_dentry(void);
 343
 344struct ring_buffer_event;
 345
 346struct ring_buffer_event *
 347trace_buffer_lock_reserve(struct ring_buffer *buffer,
 348                          int type,
 349                          unsigned long len,
 350                          unsigned long flags,
 351                          int pc);
 352void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 353                                struct ring_buffer_event *event,
 354                                unsigned long flags, int pc);
 355
 356struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 357                                                struct trace_array_cpu *data);
 358
 359struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 360                                          int *ent_cpu, u64 *ent_ts);
 361
 362int trace_empty(struct trace_iterator *iter);
 363
 364void *trace_find_next_entry_inc(struct trace_iterator *iter);
 365
 366void trace_init_global_iter(struct trace_iterator *iter);
 367
 368void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 369
 370void default_wait_pipe(struct trace_iterator *iter);
 371void poll_wait_pipe(struct trace_iterator *iter);
 372
 373void ftrace(struct trace_array *tr,
 374                            struct trace_array_cpu *data,
 375                            unsigned long ip,
 376                            unsigned long parent_ip,
 377                            unsigned long flags, int pc);
 378void tracing_sched_switch_trace(struct trace_array *tr,
 379                                struct task_struct *prev,
 380                                struct task_struct *next,
 381                                unsigned long flags, int pc);
 382
 383void tracing_sched_wakeup_trace(struct trace_array *tr,
 384                                struct task_struct *wakee,
 385                                struct task_struct *cur,
 386                                unsigned long flags, int pc);
 387void trace_function(struct trace_array *tr,
 388                    unsigned long ip,
 389                    unsigned long parent_ip,
 390                    unsigned long flags, int pc);
 391void trace_graph_function(struct trace_array *tr,
 392                    unsigned long ip,
 393                    unsigned long parent_ip,
 394                    unsigned long flags, int pc);
 395void trace_latency_header(struct seq_file *m);
 396void trace_default_header(struct seq_file *m);
 397void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 398int trace_empty(struct trace_iterator *iter);
 399
 400void trace_graph_return(struct ftrace_graph_ret *trace);
 401int trace_graph_entry(struct ftrace_graph_ent *trace);
 402void set_graph_array(struct trace_array *tr);
 403
 404void tracing_start_cmdline_record(void);
 405void tracing_stop_cmdline_record(void);
 406void tracing_sched_switch_assign_trace(struct trace_array *tr);
 407void tracing_stop_sched_switch_record(void);
 408void tracing_start_sched_switch_record(void);
 409int register_tracer(struct tracer *type);
 410void unregister_tracer(struct tracer *type);
 411int is_tracing_stopped(void);
 412enum trace_file_type {
 413        TRACE_FILE_LAT_FMT      = 1,
 414        TRACE_FILE_ANNOTATE     = 2,
 415};
 416
 417extern cpumask_var_t __read_mostly tracing_buffer_mask;
 418
 419#define for_each_tracing_cpu(cpu)       \
 420        for_each_cpu(cpu, tracing_buffer_mask)
 421
 422extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 423
 424extern unsigned long tracing_thresh;
 425
 426#ifdef CONFIG_TRACER_MAX_TRACE
 427extern unsigned long tracing_max_latency;
 428
 429void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 430void update_max_tr_single(struct trace_array *tr,
 431                          struct task_struct *tsk, int cpu);
 432#endif /* CONFIG_TRACER_MAX_TRACE */
 433
 434#ifdef CONFIG_STACKTRACE
 435void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
 436                        int skip, int pc);
 437
 438void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
 439                             int skip, int pc, struct pt_regs *regs);
 440
 441void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
 442                            int pc);
 443
 444void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
 445                   int pc);
 446#else
 447static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 448                                      unsigned long flags, int skip, int pc)
 449{
 450}
 451
 452static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
 453                                           unsigned long flags, int skip,
 454                                           int pc, struct pt_regs *regs)
 455{
 456}
 457
 458static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
 459                                          unsigned long flags, int pc)
 460{
 461}
 462
 463static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
 464                                 int skip, int pc)
 465{
 466}
 467#endif /* CONFIG_STACKTRACE */
 468
 469extern cycle_t ftrace_now(int cpu);
 470
 471extern void trace_find_cmdline(int pid, char comm[]);
 472
 473#ifdef CONFIG_DYNAMIC_FTRACE
 474extern unsigned long ftrace_update_tot_cnt;
 475#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
 476extern int DYN_FTRACE_TEST_NAME(void);
 477#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
 478extern int DYN_FTRACE_TEST_NAME2(void);
 479#endif
 480
 481extern int ring_buffer_expanded;
 482extern bool tracing_selftest_disabled;
 483DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 484
 485#ifdef CONFIG_FTRACE_STARTUP_TEST
 486extern int trace_selftest_startup_function(struct tracer *trace,
 487                                           struct trace_array *tr);
 488extern int trace_selftest_startup_function_graph(struct tracer *trace,
 489                                                 struct trace_array *tr);
 490extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 491                                          struct trace_array *tr);
 492extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 493                                             struct trace_array *tr);
 494extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 495                                                 struct trace_array *tr);
 496extern int trace_selftest_startup_wakeup(struct tracer *trace,
 497                                         struct trace_array *tr);
 498extern int trace_selftest_startup_nop(struct tracer *trace,
 499                                         struct trace_array *tr);
 500extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 501                                               struct trace_array *tr);
 502extern int trace_selftest_startup_branch(struct tracer *trace,
 503                                         struct trace_array *tr);
 504#endif /* CONFIG_FTRACE_STARTUP_TEST */
 505
 506extern void *head_page(struct trace_array_cpu *data);
 507extern unsigned long long ns2usecs(cycle_t nsec);
 508extern int
 509trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
 510extern int
 511trace_vprintk(unsigned long ip, const char *fmt, va_list args);
 512extern int
 513trace_array_vprintk(struct trace_array *tr,
 514                    unsigned long ip, const char *fmt, va_list args);
 515int trace_array_printk(struct trace_array *tr,
 516                       unsigned long ip, const char *fmt, ...);
 517void trace_printk_seq(struct trace_seq *s);
 518enum print_line_t print_trace_line(struct trace_iterator *iter);
 519
 520extern unsigned long trace_flags;
 521
 522extern int trace_clock_id;
 523
 524/* Standard output formatting function used for function return traces */
 525#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 526
 527/* Flag options */
 528#define TRACE_GRAPH_PRINT_OVERRUN       0x1
 529#define TRACE_GRAPH_PRINT_CPU           0x2
 530#define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 531#define TRACE_GRAPH_PRINT_PROC          0x8
 532#define TRACE_GRAPH_PRINT_DURATION      0x10
 533#define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 534
 535extern enum print_line_t
 536print_graph_function_flags(struct trace_iterator *iter, u32 flags);
 537extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
 538extern enum print_line_t
 539trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
 540extern void graph_trace_open(struct trace_iterator *iter);
 541extern void graph_trace_close(struct trace_iterator *iter);
 542extern int __trace_graph_entry(struct trace_array *tr,
 543                               struct ftrace_graph_ent *trace,
 544                               unsigned long flags, int pc);
 545extern void __trace_graph_return(struct trace_array *tr,
 546                                 struct ftrace_graph_ret *trace,
 547                                 unsigned long flags, int pc);
 548
 549
 550#ifdef CONFIG_DYNAMIC_FTRACE
 551/* TODO: make this variable */
 552#define FTRACE_GRAPH_MAX_FUNCS          32
 553extern int ftrace_graph_filter_enabled;
 554extern int ftrace_graph_count;
 555extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 556
 557static inline int ftrace_graph_addr(unsigned long addr)
 558{
 559        int i;
 560
 561        if (!ftrace_graph_filter_enabled)
 562                return 1;
 563
 564        for (i = 0; i < ftrace_graph_count; i++) {
 565                if (addr == ftrace_graph_funcs[i]) {
 566                        /*
 567                         * If no irqs are to be traced, but a set_graph_function
 568                         * is set, and called by an interrupt handler, we still
 569                         * want to trace it.
 570                         */
 571                        if (in_irq())
 572                                trace_recursion_set(TRACE_IRQ_BIT);
 573                        else
 574                                trace_recursion_clear(TRACE_IRQ_BIT);
 575                        return 1;
 576                }
 577        }
 578
 579        return 0;
 580}
 581#else
 582static inline int ftrace_graph_addr(unsigned long addr)
 583{
 584        return 1;
 585}
 586#endif /* CONFIG_DYNAMIC_FTRACE */
 587#else /* CONFIG_FUNCTION_GRAPH_TRACER */
 588static inline enum print_line_t
 589print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 590{
 591        return TRACE_TYPE_UNHANDLED;
 592}
 593#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 594
 595extern struct list_head ftrace_pids;
 596
 597#ifdef CONFIG_FUNCTION_TRACER
 598static inline int ftrace_trace_task(struct task_struct *task)
 599{
 600        if (list_empty(&ftrace_pids))
 601                return 1;
 602
 603        return test_tsk_trace_trace(task);
 604}
 605extern int ftrace_is_dead(void);
 606#else
 607static inline int ftrace_trace_task(struct task_struct *task)
 608{
 609        return 1;
 610}
 611static inline int ftrace_is_dead(void) { return 0; }
 612#endif
 613
 614int ftrace_event_is_function(struct ftrace_event_call *call);
 615
 616/*
 617 * struct trace_parser - servers for reading the user input separated by spaces
 618 * @cont: set if the input is not complete - no final space char was found
 619 * @buffer: holds the parsed user input
 620 * @idx: user input length
 621 * @size: buffer size
 622 */
 623struct trace_parser {
 624        bool            cont;
 625        char            *buffer;
 626        unsigned        idx;
 627        unsigned        size;
 628};
 629
 630static inline bool trace_parser_loaded(struct trace_parser *parser)
 631{
 632        return (parser->idx != 0);
 633}
 634
 635static inline bool trace_parser_cont(struct trace_parser *parser)
 636{
 637        return parser->cont;
 638}
 639
 640static inline void trace_parser_clear(struct trace_parser *parser)
 641{
 642        parser->cont = false;
 643        parser->idx = 0;
 644}
 645
 646extern int trace_parser_get_init(struct trace_parser *parser, int size);
 647extern void trace_parser_put(struct trace_parser *parser);
 648extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 649        size_t cnt, loff_t *ppos);
 650
 651/*
 652 * trace_iterator_flags is an enumeration that defines bit
 653 * positions into trace_flags that controls the output.
 654 *
 655 * NOTE: These bits must match the trace_options array in
 656 *       trace.c.
 657 */
 658enum trace_iterator_flags {
 659        TRACE_ITER_PRINT_PARENT         = 0x01,
 660        TRACE_ITER_SYM_OFFSET           = 0x02,
 661        TRACE_ITER_SYM_ADDR             = 0x04,
 662        TRACE_ITER_VERBOSE              = 0x08,
 663        TRACE_ITER_RAW                  = 0x10,
 664        TRACE_ITER_HEX                  = 0x20,
 665        TRACE_ITER_BIN                  = 0x40,
 666        TRACE_ITER_BLOCK                = 0x80,
 667        TRACE_ITER_STACKTRACE           = 0x100,
 668        TRACE_ITER_PRINTK               = 0x200,
 669        TRACE_ITER_PREEMPTONLY          = 0x400,
 670        TRACE_ITER_BRANCH               = 0x800,
 671        TRACE_ITER_ANNOTATE             = 0x1000,
 672        TRACE_ITER_USERSTACKTRACE       = 0x2000,
 673        TRACE_ITER_SYM_USEROBJ          = 0x4000,
 674        TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
 675        TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
 676        TRACE_ITER_LATENCY_FMT          = 0x20000,
 677        TRACE_ITER_SLEEP_TIME           = 0x40000,
 678        TRACE_ITER_GRAPH_TIME           = 0x80000,
 679        TRACE_ITER_RECORD_CMD           = 0x100000,
 680        TRACE_ITER_OVERWRITE            = 0x200000,
 681        TRACE_ITER_STOP_ON_FREE         = 0x400000,
 682        TRACE_ITER_IRQ_INFO             = 0x800000,
 683};
 684
 685/*
 686 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 687 * control the output of kernel symbols.
 688 */
 689#define TRACE_ITER_SYM_MASK \
 690        (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
 691
 692extern struct tracer nop_trace;
 693
 694#ifdef CONFIG_BRANCH_TRACER
 695extern int enable_branch_tracing(struct trace_array *tr);
 696extern void disable_branch_tracing(void);
 697static inline int trace_branch_enable(struct trace_array *tr)
 698{
 699        if (trace_flags & TRACE_ITER_BRANCH)
 700                return enable_branch_tracing(tr);
 701        return 0;
 702}
 703static inline void trace_branch_disable(void)
 704{
 705        /* due to races, always disable */
 706        disable_branch_tracing();
 707}
 708#else
 709static inline int trace_branch_enable(struct trace_array *tr)
 710{
 711        return 0;
 712}
 713static inline void trace_branch_disable(void)
 714{
 715}
 716#endif /* CONFIG_BRANCH_TRACER */
 717
 718/* set ring buffers to default size if not already done so */
 719int tracing_update_buffers(void);
 720
 721/* trace event type bit fields, not numeric */
 722enum {
 723        TRACE_EVENT_TYPE_PRINTF         = 1,
 724        TRACE_EVENT_TYPE_RAW            = 2,
 725};
 726
 727struct ftrace_event_field {
 728        struct list_head        link;
 729        char                    *name;
 730        char                    *type;
 731        int                     filter_type;
 732        int                     offset;
 733        int                     size;
 734        int                     is_signed;
 735};
 736
 737struct event_filter {
 738        int                     n_preds;        /* Number assigned */
 739        int                     a_preds;        /* allocated */
 740        struct filter_pred      *preds;
 741        struct filter_pred      *root;
 742        char                    *filter_string;
 743};
 744
 745struct event_subsystem {
 746        struct list_head        list;
 747        const char              *name;
 748        struct dentry           *entry;
 749        struct event_filter     *filter;
 750        int                     nr_events;
 751        int                     ref_count;
 752};
 753
 754#define FILTER_PRED_INVALID     ((unsigned short)-1)
 755#define FILTER_PRED_IS_RIGHT    (1 << 15)
 756#define FILTER_PRED_FOLD        (1 << 15)
 757
 758/*
 759 * The max preds is the size of unsigned short with
 760 * two flags at the MSBs. One bit is used for both the IS_RIGHT
 761 * and FOLD flags. The other is reserved.
 762 *
 763 * 2^14 preds is way more than enough.
 764 */
 765#define MAX_FILTER_PRED         16384
 766
 767struct filter_pred;
 768struct regex;
 769
 770typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
 771
 772typedef int (*regex_match_func)(char *str, struct regex *r, int len);
 773
 774enum regex_type {
 775        MATCH_FULL = 0,
 776        MATCH_FRONT_ONLY,
 777        MATCH_MIDDLE_ONLY,
 778        MATCH_END_ONLY,
 779};
 780
 781struct regex {
 782        char                    pattern[MAX_FILTER_STR_VAL];
 783        int                     len;
 784        int                     field_len;
 785        regex_match_func        match;
 786};
 787
 788struct filter_pred {
 789        filter_pred_fn_t        fn;
 790        u64                     val;
 791        struct regex            regex;
 792        unsigned short          *ops;
 793        struct ftrace_event_field *field;
 794        int                     offset;
 795        int                     not;
 796        int                     op;
 797        unsigned short          index;
 798        unsigned short          parent;
 799        unsigned short          left;
 800        unsigned short          right;
 801};
 802
 803extern struct list_head ftrace_common_fields;
 804
 805extern enum regex_type
 806filter_parse_regex(char *buff, int len, char **search, int *not);
 807extern void print_event_filter(struct ftrace_event_call *call,
 808                               struct trace_seq *s);
 809extern int apply_event_filter(struct ftrace_event_call *call,
 810                              char *filter_string);
 811extern int apply_subsystem_event_filter(struct event_subsystem *system,
 812                                        char *filter_string);
 813extern void print_subsystem_event_filter(struct event_subsystem *system,
 814                                         struct trace_seq *s);
 815extern int filter_assign_type(const char *type);
 816
 817struct list_head *
 818trace_get_fields(struct ftrace_event_call *event_call);
 819
 820static inline int
 821filter_check_discard(struct ftrace_event_call *call, void *rec,
 822                     struct ring_buffer *buffer,
 823                     struct ring_buffer_event *event)
 824{
 825        if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
 826            !filter_match_preds(call->filter, rec)) {
 827                ring_buffer_discard_commit(buffer, event);
 828                return 1;
 829        }
 830
 831        return 0;
 832}
 833
 834extern void trace_event_enable_cmd_record(bool enable);
 835
 836extern struct mutex event_mutex;
 837extern struct list_head ftrace_events;
 838
 839extern const char *__start___trace_bprintk_fmt[];
 840extern const char *__stop___trace_bprintk_fmt[];
 841
 842void trace_printk_init_buffers(void);
 843
 844#undef FTRACE_ENTRY
 845#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
 846        extern struct ftrace_event_call                                 \
 847        __attribute__((__aligned__(4))) event_##call;
 848#undef FTRACE_ENTRY_DUP
 849#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
 850        FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 851                     filter)
 852#include "trace_entries.h"
 853
 854#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
 855int perf_ftrace_event_register(struct ftrace_event_call *call,
 856                               enum trace_reg type, void *data);
 857#else
 858#define perf_ftrace_event_register NULL
 859#endif
 860
 861#endif /* _LINUX_KERNEL_TRACE_H */
 862
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