include/linux/trace_events.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef _LINUX_TRACE_EVENT_H
   4 #define _LINUX_TRACE_EVENT_H
   5
   6 #include <linux/ring_buffer.h>
   7 #include <linux/trace_seq.h>
   8 #include <linux/percpu.h>
   9 #include <linux/hardirq.h>
  10 #include <linux/perf_event.h>
  11 #include <linux/tracepoint.h>
  12
  13 struct trace_array;
  14 struct array_buffer;
  15 struct tracer;
  16 struct dentry;
  17 struct bpf_prog;
  18
  19 const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
  20                                   unsigned long flags,
  21                                   const struct trace_print_flags *flag_array);
  22
  23 const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
  24                                     const struct trace_print_flags *symbol_array);
  25
  26 #if BITS_PER_LONG == 32
  27 const char *trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
  28                       unsigned long long flags,
  29                       const struct trace_print_flags_u64 *flag_array);
  30
  31 const char *trace_print_symbols_seq_u64(struct trace_seq *p,
  32                                         unsigned long long val,
  33                                         const struct trace_print_flags_u64
  34                                                                  *symbol_array);
  35 #endif
  36
  37 const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
  38                                     unsigned int bitmask_size);
  39
  40 const char *trace_print_hex_seq(struct trace_seq *p,
  41                                 const unsigned char *buf, int len,
  42                                 bool concatenate);
  43
  44 const char *trace_print_array_seq(struct trace_seq *p,
  45                                    const void *buf, int count,
  46                                    size_t el_size);
  47
  48 const char *
  49 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
  50                          int prefix_type, int rowsize, int groupsize,
  51                          const void *buf, size_t len, bool ascii);
  52
  53 struct trace_iterator;
  54 struct trace_event;
  55
  56 int trace_raw_output_prep(struct trace_iterator *iter,
  57                           struct trace_event *event);
  58
  59 /*
  60  * The trace entry - the most basic unit of tracing. This is what
  61  * is printed in the end as a single line in the trace output, such as:
  62  *
  63  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  64  */
  65 struct trace_entry {
  66         unsigned short          type;
  67         unsigned char           flags;
  68         unsigned char           preempt_count;
  69         int                     pid;
  70 };
  71
  72 #define TRACE_EVENT_TYPE_MAX                                            \
  73         ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
  74
  75 /*
  76  * Trace iterator - used by printout routines who present trace
  77  * results to users and which routines might sleep, etc:
  78  */
  79 struct trace_iterator {
  80         struct trace_array      *tr;
  81         struct tracer           *trace;
  82         struct array_buffer     *array_buffer;
  83         void                    *private;
  84         int                     cpu_file;
  85         struct mutex            mutex;
  86         struct ring_buffer_iter **buffer_iter;
  87         unsigned long           iter_flags;
  88         void                    *temp;  /* temp holder */
  89         unsigned int            temp_size;
  90
  91         /* trace_seq for __print_flags() and __print_symbolic() etc. */
  92         struct trace_seq        tmp_seq;
  93
  94         cpumask_var_t           started;
  95
  96         /* it's true when current open file is snapshot */
  97         bool                    snapshot;
  98
  99         /* The below is zeroed out in pipe_read */
 100         struct trace_seq        seq;
 101         struct trace_entry      *ent;
 102         unsigned long           lost_events;
 103         int                     leftover;
 104         int                     ent_size;
 105         int                     cpu;
 106         u64                     ts;
 107
 108         loff_t                  pos;
 109         long                    idx;
 110
 111         /* All new field here will be zeroed out in pipe_read */
 112 };
 113
 114 enum trace_iter_flags {
 115         TRACE_FILE_LAT_FMT      = 1,
 116         TRACE_FILE_ANNOTATE     = 2,
 117         TRACE_FILE_TIME_IN_NS   = 4,
 118 };
 119
 120
 121 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
 122                                       int flags, struct trace_event *event);
 123
 124 struct trace_event_functions {
 125         trace_print_func        trace;
 126         trace_print_func        raw;
 127         trace_print_func        hex;
 128         trace_print_func        binary;
 129 };
 130
 131 struct trace_event {
 132         struct hlist_node               node;
 133         struct list_head                list;
 134         int                             type;
 135         struct trace_event_functions    *funcs;
 136 };
 137
 138 extern int register_trace_event(struct trace_event *event);
 139 extern int unregister_trace_event(struct trace_event *event);
 140
 141 /* Return values for print_line callback */
 142 enum print_line_t {
 143         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
 144         TRACE_TYPE_HANDLED      = 1,
 145         TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
 146         TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
 147 };
 148
 149 enum print_line_t trace_handle_return(struct trace_seq *s);
 150
 151 void tracing_generic_entry_update(struct trace_entry *entry,
 152                                   unsigned short type,
 153                                   unsigned long flags,
 154                                   int pc);
 155 struct trace_event_file;
 156
 157 struct ring_buffer_event *
 158 trace_event_buffer_lock_reserve(struct trace_buffer **current_buffer,
 159                                 struct trace_event_file *trace_file,
 160                                 int type, unsigned long len,
 161                                 unsigned long flags, int pc);
 162
 163 #define TRACE_RECORD_CMDLINE    BIT(0)
 164 #define TRACE_RECORD_TGID       BIT(1)
 165
 166 void tracing_record_taskinfo(struct task_struct *task, int flags);
 167 void tracing_record_taskinfo_sched_switch(struct task_struct *prev,
 168                                           struct task_struct *next, int flags);
 169
 170 void tracing_record_cmdline(struct task_struct *task);
 171 void tracing_record_tgid(struct task_struct *task);
 172
 173 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
 174
 175 struct event_filter;
 176
 177 enum trace_reg {
 178         TRACE_REG_REGISTER,
 179         TRACE_REG_UNREGISTER,
 180 #ifdef CONFIG_PERF_EVENTS
 181         TRACE_REG_PERF_REGISTER,
 182         TRACE_REG_PERF_UNREGISTER,
 183         TRACE_REG_PERF_OPEN,
 184         TRACE_REG_PERF_CLOSE,
 185         /*
 186          * These (ADD/DEL) use a 'boolean' return value, where 1 (true) means a
 187          * custom action was taken and the default action is not to be
 188          * performed.
 189          */
 190         TRACE_REG_PERF_ADD,
 191         TRACE_REG_PERF_DEL,
 192 #endif
 193 };
 194
 195 struct trace_event_call;
 196
 197 #define TRACE_FUNCTION_TYPE ((const char *)~0UL)
 198
 199 struct trace_event_fields {
 200         const char *type;
 201         union {
 202                 struct {
 203                         const char *name;
 204                         const int  size;
 205                         const int  align;
 206                         const int  is_signed;
 207                         const int  filter_type;
 208                 };
 209                 int (*define_fields)(struct trace_event_call *);
 210         };
 211 };
 212
 213 struct trace_event_class {
 214         const char              *system;
 215         void                    *probe;
 216 #ifdef CONFIG_PERF_EVENTS
 217         void                    *perf_probe;
 218 #endif
 219         int                     (*reg)(struct trace_event_call *event,
 220                                        enum trace_reg type, void *data);
 221         struct trace_event_fields *fields_array;
 222         struct list_head        *(*get_fields)(struct trace_event_call *);
 223         struct list_head        fields;
 224         int                     (*raw_init)(struct trace_event_call *);
 225 };
 226
 227 extern int trace_event_reg(struct trace_event_call *event,
 228                             enum trace_reg type, void *data);
 229
 230 struct trace_event_buffer {
 231         struct trace_buffer             *buffer;
 232         struct ring_buffer_event        *event;
 233         struct trace_event_file         *trace_file;
 234         void                            *entry;
 235         unsigned long                   flags;
 236         int                             pc;
 237         struct pt_regs                  *regs;
 238 };
 239
 240 void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 241                                   struct trace_event_file *trace_file,
 242                                   unsigned long len);
 243
 244 void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
 245
 246 enum {
 247         TRACE_EVENT_FL_FILTERED_BIT,
 248         TRACE_EVENT_FL_CAP_ANY_BIT,
 249         TRACE_EVENT_FL_NO_SET_FILTER_BIT,
 250         TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
 251         TRACE_EVENT_FL_TRACEPOINT_BIT,
 252         TRACE_EVENT_FL_KPROBE_BIT,
 253         TRACE_EVENT_FL_UPROBE_BIT,
 254 };
 255
 256 /*
 257  * Event flags:
 258  *  FILTERED      - The event has a filter attached
 259  *  CAP_ANY       - Any user can enable for perf
 260  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 261  *  IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
 262  *  TRACEPOINT    - Event is a tracepoint
 263  *  KPROBE        - Event is a kprobe
 264  *  UPROBE        - Event is a uprobe
 265  */
 266 enum {
 267         TRACE_EVENT_FL_FILTERED         = (1 << TRACE_EVENT_FL_FILTERED_BIT),
 268         TRACE_EVENT_FL_CAP_ANY          = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
 269         TRACE_EVENT_FL_NO_SET_FILTER    = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
 270         TRACE_EVENT_FL_IGNORE_ENABLE    = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
 271         TRACE_EVENT_FL_TRACEPOINT       = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
 272         TRACE_EVENT_FL_KPROBE           = (1 << TRACE_EVENT_FL_KPROBE_BIT),
 273         TRACE_EVENT_FL_UPROBE           = (1 << TRACE_EVENT_FL_UPROBE_BIT),
 274 };
 275
 276 #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
 277
 278 struct trace_event_call {
 279         struct list_head        list;
 280         struct trace_event_class *class;
 281         union {
 282                 char                    *name;
 283                 /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
 284                 struct tracepoint       *tp;
 285         };
 286         struct trace_event      event;
 287         char                    *print_fmt;
 288         struct event_filter     *filter;
 289         void                    *mod;
 290         void                    *data;
 291         /*
 292          *   bit 0:             filter_active
 293          *   bit 1:             allow trace by non root (cap any)
 294          *   bit 2:             failed to apply filter
 295          *   bit 3:             trace internal event (do not enable)
 296          *   bit 4:             Event was enabled by module
 297          *   bit 5:             use call filter rather than file filter
 298          *   bit 6:             Event is a tracepoint
 299          */
 300         int                     flags; /* static flags of different events */
 301
 302 #ifdef CONFIG_PERF_EVENTS
 303         int                             perf_refcount;
 304         struct hlist_head __percpu      *perf_events;
 305         struct bpf_prog_array __rcu     *prog_array;
 306
 307         int     (*perf_perm)(struct trace_event_call *,
 308                              struct perf_event *);
 309 #endif
 310 };
 311
 312 #ifdef CONFIG_PERF_EVENTS
 313 static inline bool bpf_prog_array_valid(struct trace_event_call *call)
 314 {
 315         /*
 316          * This inline function checks whether call->prog_array
 317          * is valid or not. The function is called in various places,
 318          * outside rcu_read_lock/unlock, as a heuristic to speed up execution.
 319          *
 320          * If this function returns true, and later call->prog_array
 321          * becomes false inside rcu_read_lock/unlock region,
 322          * we bail out then. If this function return false,
 323          * there is a risk that we might miss a few events if the checking
 324          * were delayed until inside rcu_read_lock/unlock region and
 325          * call->prog_array happened to become non-NULL then.
 326          *
 327          * Here, READ_ONCE() is used instead of rcu_access_pointer().
 328          * rcu_access_pointer() requires the actual definition of
 329          * "struct bpf_prog_array" while READ_ONCE() only needs
 330          * a declaration of the same type.
 331          */
 332         return !!READ_ONCE(call->prog_array);
 333 }
 334 #endif
 335
 336 static inline const char *
 337 trace_event_name(struct trace_event_call *call)
 338 {
 339         if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
 340                 return call->tp ? call->tp->name : NULL;
 341         else
 342                 return call->name;
 343 }
 344
 345 static inline struct list_head *
 346 trace_get_fields(struct trace_event_call *event_call)
 347 {
 348         if (!event_call->class->get_fields)
 349                 return &event_call->class->fields;
 350         return event_call->class->get_fields(event_call);
 351 }
 352
 353 struct trace_array;
 354 struct trace_subsystem_dir;
 355
 356 enum {
 357         EVENT_FILE_FL_ENABLED_BIT,
 358         EVENT_FILE_FL_RECORDED_CMD_BIT,
 359         EVENT_FILE_FL_RECORDED_TGID_BIT,
 360         EVENT_FILE_FL_FILTERED_BIT,
 361         EVENT_FILE_FL_NO_SET_FILTER_BIT,
 362         EVENT_FILE_FL_SOFT_MODE_BIT,
 363         EVENT_FILE_FL_SOFT_DISABLED_BIT,
 364         EVENT_FILE_FL_TRIGGER_MODE_BIT,
 365         EVENT_FILE_FL_TRIGGER_COND_BIT,
 366         EVENT_FILE_FL_PID_FILTER_BIT,
 367         EVENT_FILE_FL_WAS_ENABLED_BIT,
 368 };
 369
 370 extern struct trace_event_file *trace_get_event_file(const char *instance,
 371                                                      const char *system,
 372                                                      const char *event);
 373 extern void trace_put_event_file(struct trace_event_file *file);
 374
 375 #define MAX_DYNEVENT_CMD_LEN    (2048)
 376
 377 enum dynevent_type {
 378         DYNEVENT_TYPE_SYNTH = 1,
 379         DYNEVENT_TYPE_KPROBE,
 380         DYNEVENT_TYPE_NONE,
 381 };
 382
 383 struct dynevent_cmd;
 384
 385 typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd);
 386
 387 struct dynevent_cmd {
 388         struct seq_buf          seq;
 389         const char              *event_name;
 390         unsigned int            n_fields;
 391         enum dynevent_type      type;
 392         dynevent_create_fn_t    run_command;
 393         void                    *private_data;
 394 };
 395
 396 extern int dynevent_create(struct dynevent_cmd *cmd);
 397
 398 extern int synth_event_delete(const char *name);
 399
 400 extern void synth_event_cmd_init(struct dynevent_cmd *cmd,
 401                                  char *buf, int maxlen);
 402
 403 extern int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd,
 404                                        const char *name,
 405                                        struct module *mod, ...);
 406
 407 #define synth_event_gen_cmd_start(cmd, name, mod, ...)  \
 408         __synth_event_gen_cmd_start(cmd, name, mod, ## __VA_ARGS__, NULL)
 409
 410 struct synth_field_desc {
 411         const char *type;
 412         const char *name;
 413 };
 414
 415 extern int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd,
 416                                            const char *name,
 417                                            struct module *mod,
 418                                            struct synth_field_desc *fields,
 419                                            unsigned int n_fields);
 420 extern int synth_event_create(const char *name,
 421                               struct synth_field_desc *fields,
 422                               unsigned int n_fields, struct module *mod);
 423
 424 extern int synth_event_add_field(struct dynevent_cmd *cmd,
 425                                  const char *type,
 426                                  const char *name);
 427 extern int synth_event_add_field_str(struct dynevent_cmd *cmd,
 428                                      const char *type_name);
 429 extern int synth_event_add_fields(struct dynevent_cmd *cmd,
 430                                   struct synth_field_desc *fields,
 431                                   unsigned int n_fields);
 432
 433 #define synth_event_gen_cmd_end(cmd)    \
 434         dynevent_create(cmd)
 435
 436 struct synth_event;
 437
 438 struct synth_event_trace_state {
 439         struct trace_event_buffer fbuffer;
 440         struct synth_trace_event *entry;
 441         struct trace_buffer *buffer;
 442         struct synth_event *event;
 443         unsigned int cur_field;
 444         unsigned int n_u64;
 445         bool disabled;
 446         bool add_next;
 447         bool add_name;
 448 };
 449
 450 extern int synth_event_trace(struct trace_event_file *file,
 451                              unsigned int n_vals, ...);
 452 extern int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
 453                                    unsigned int n_vals);
 454 extern int synth_event_trace_start(struct trace_event_file *file,
 455                                    struct synth_event_trace_state *trace_state);
 456 extern int synth_event_add_next_val(u64 val,
 457                                     struct synth_event_trace_state *trace_state);
 458 extern int synth_event_add_val(const char *field_name, u64 val,
 459                                struct synth_event_trace_state *trace_state);
 460 extern int synth_event_trace_end(struct synth_event_trace_state *trace_state);
 461
 462 extern int kprobe_event_delete(const char *name);
 463
 464 extern void kprobe_event_cmd_init(struct dynevent_cmd *cmd,
 465                                   char *buf, int maxlen);
 466
 467 #define kprobe_event_gen_cmd_start(cmd, name, loc, ...)                 \
 468         __kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)
 469
 470 #define kretprobe_event_gen_cmd_start(cmd, name, loc, ...)              \
 471         __kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)
 472
 473 extern int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd,
 474                                         bool kretprobe,
 475                                         const char *name,
 476                                         const char *loc, ...);
 477
 478 #define kprobe_event_add_fields(cmd, ...)       \
 479         __kprobe_event_add_fields(cmd, ## __VA_ARGS__, NULL)
 480
 481 #define kprobe_event_add_field(cmd, field)      \
 482         __kprobe_event_add_fields(cmd, field, NULL)
 483
 484 extern int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...);
 485
 486 #define kprobe_event_gen_cmd_end(cmd)           \
 487         dynevent_create(cmd)
 488
 489 #define kretprobe_event_gen_cmd_end(cmd)        \
 490         dynevent_create(cmd)
 491
 492 /*
 493  * Event file flags:
 494  *  ENABLED       - The event is enabled
 495  *  RECORDED_CMD  - The comms should be recorded at sched_switch
 496  *  RECORDED_TGID - The tgids should be recorded at sched_switch
 497  *  FILTERED      - The event has a filter attached
 498  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 499  *  SOFT_MODE     - The event is enabled/disabled by SOFT_DISABLED
 500  *  SOFT_DISABLED - When set, do not trace the event (even though its
 501  *                   tracepoint may be enabled)
 502  *  TRIGGER_MODE  - When set, invoke the triggers associated with the event
 503  *  TRIGGER_COND  - When set, one or more triggers has an associated filter
 504  *  PID_FILTER    - When set, the event is filtered based on pid
 505  *  WAS_ENABLED   - Set when enabled to know to clear trace on module removal
 506  */
 507 enum {
 508         EVENT_FILE_FL_ENABLED           = (1 << EVENT_FILE_FL_ENABLED_BIT),
 509         EVENT_FILE_FL_RECORDED_CMD      = (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
 510         EVENT_FILE_FL_RECORDED_TGID     = (1 << EVENT_FILE_FL_RECORDED_TGID_BIT),
 511         EVENT_FILE_FL_FILTERED          = (1 << EVENT_FILE_FL_FILTERED_BIT),
 512         EVENT_FILE_FL_NO_SET_FILTER     = (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
 513         EVENT_FILE_FL_SOFT_MODE         = (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
 514         EVENT_FILE_FL_SOFT_DISABLED     = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
 515         EVENT_FILE_FL_TRIGGER_MODE      = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
 516         EVENT_FILE_FL_TRIGGER_COND      = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
 517         EVENT_FILE_FL_PID_FILTER        = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
 518         EVENT_FILE_FL_WAS_ENABLED       = (1 << EVENT_FILE_FL_WAS_ENABLED_BIT),
 519 };
 520
 521 struct trace_event_file {
 522         struct list_head                list;
 523         struct trace_event_call         *event_call;
 524         struct event_filter __rcu       *filter;
 525         struct dentry                   *dir;
 526         struct trace_array              *tr;
 527         struct trace_subsystem_dir      *system;
 528         struct list_head                triggers;
 529
 530         /*
 531          * 32 bit flags:
 532          *   bit 0:             enabled
 533          *   bit 1:             enabled cmd record
 534          *   bit 2:             enable/disable with the soft disable bit
 535          *   bit 3:             soft disabled
 536          *   bit 4:             trigger enabled
 537          *
 538          * Note: The bits must be set atomically to prevent races
 539          * from other writers. Reads of flags do not need to be in
 540          * sync as they occur in critical sections. But the way flags
 541          * is currently used, these changes do not affect the code
 542          * except that when a change is made, it may have a slight
 543          * delay in propagating the changes to other CPUs due to
 544          * caching and such. Which is mostly OK ;-)
 545          */
 546         unsigned long           flags;
 547         atomic_t                sm_ref; /* soft-mode reference counter */
 548         atomic_t                tm_ref; /* trigger-mode reference counter */
 549 };
 550
 551 #define __TRACE_EVENT_FLAGS(name, value)                                \
 552         static int __init trace_init_flags_##name(void)                 \
 553         {                                                               \
 554                 event_##name.flags |= value;                            \
 555                 return 0;                                               \
 556         }                                                               \
 557         early_initcall(trace_init_flags_##name);
 558
 559 #define __TRACE_EVENT_PERF_PERM(name, expr...)                          \
 560         static int perf_perm_##name(struct trace_event_call *tp_event, \
 561                                     struct perf_event *p_event)         \
 562         {                                                               \
 563                 return ({ expr; });                                     \
 564         }                                                               \
 565         static int __init trace_init_perf_perm_##name(void)             \
 566         {                                                               \
 567                 event_##name.perf_perm = &perf_perm_##name;             \
 568                 return 0;                                               \
 569         }                                                               \
 570         early_initcall(trace_init_perf_perm_##name);
 571
 572 #define PERF_MAX_TRACE_SIZE     2048
 573
 574 #define MAX_FILTER_STR_VAL      256     /* Should handle KSYM_SYMBOL_LEN */
 575
 576 enum event_trigger_type {
 577         ETT_NONE                = (0),
 578         ETT_TRACE_ONOFF         = (1 << 0),
 579         ETT_SNAPSHOT            = (1 << 1),
 580         ETT_STACKTRACE          = (1 << 2),
 581         ETT_EVENT_ENABLE        = (1 << 3),
 582         ETT_EVENT_HIST          = (1 << 4),
 583         ETT_HIST_ENABLE         = (1 << 5),
 584 };
 585
 586 extern int filter_match_preds(struct event_filter *filter, void *rec);
 587
 588 extern enum event_trigger_type
 589 event_triggers_call(struct trace_event_file *file, void *rec,
 590                     struct ring_buffer_event *event);
 591 extern void
 592 event_triggers_post_call(struct trace_event_file *file,
 593                          enum event_trigger_type tt);
 594
 595 bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
 596
 597 /**
 598  * trace_trigger_soft_disabled - do triggers and test if soft disabled
 599  * @file: The file pointer of the event to test
 600  *
 601  * If any triggers without filters are attached to this event, they
 602  * will be called here. If the event is soft disabled and has no
 603  * triggers that require testing the fields, it will return true,
 604  * otherwise false.
 605  */
 606 static inline bool
 607 trace_trigger_soft_disabled(struct trace_event_file *file)
 608 {
 609         unsigned long eflags = file->flags;
 610
 611         if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 612                 if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 613                         event_triggers_call(file, NULL, NULL);
 614                 if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 615                         return true;
 616                 if (eflags & EVENT_FILE_FL_PID_FILTER)
 617                         return trace_event_ignore_this_pid(file);
 618         }
 619         return false;
 620 }
 621
 622 #ifdef CONFIG_BPF_EVENTS
 623 unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);
 624 int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog);
 625 void perf_event_detach_bpf_prog(struct perf_event *event);
 626 int perf_event_query_prog_array(struct perf_event *event, void __user *info);
 627 int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
 628 int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
 629 struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name);
 630 void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp);
 631 int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
 632                             u32 *fd_type, const char **buf,
 633                             u64 *probe_offset, u64 *probe_addr);
 634 #else
 635 static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
 636 {
 637         return 1;
 638 }
 639
 640 static inline int
 641 perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog)
 642 {
 643         return -EOPNOTSUPP;
 644 }
 645
 646 static inline void perf_event_detach_bpf_prog(struct perf_event *event) { }
 647
 648 static inline int
 649 perf_event_query_prog_array(struct perf_event *event, void __user *info)
 650 {
 651         return -EOPNOTSUPP;
 652 }
 653 static inline int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *p)
 654 {
 655         return -EOPNOTSUPP;
 656 }
 657 static inline int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *p)
 658 {
 659         return -EOPNOTSUPP;
 660 }
 661 static inline struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)
 662 {
 663         return NULL;
 664 }
 665 static inline void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
 666 {
 667 }
 668 static inline int bpf_get_perf_event_info(const struct perf_event *event,
 669                                           u32 *prog_id, u32 *fd_type,
 670                                           const char **buf, u64 *probe_offset,
 671                                           u64 *probe_addr)
 672 {
 673         return -EOPNOTSUPP;
 674 }
 675 #endif
 676
 677 enum {
 678         FILTER_OTHER = 0,
 679         FILTER_STATIC_STRING,
 680         FILTER_DYN_STRING,
 681         FILTER_PTR_STRING,
 682         FILTER_TRACE_FN,
 683         FILTER_COMM,
 684         FILTER_CPU,
 685 };
 686
 687 extern int trace_event_raw_init(struct trace_event_call *call);
 688 extern int trace_define_field(struct trace_event_call *call, const char *type,
 689                               const char *name, int offset, int size,
 690                               int is_signed, int filter_type);
 691 extern int trace_add_event_call(struct trace_event_call *call);
 692 extern int trace_remove_event_call(struct trace_event_call *call);
 693 extern int trace_event_get_offsets(struct trace_event_call *call);
 694
 695 #define is_signed_type(type)    (((type)(-1)) < (type)1)
 696
 697 int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
 698 int trace_set_clr_event(const char *system, const char *event, int set);
 699 int trace_array_set_clr_event(struct trace_array *tr, const char *system,
 700                 const char *event, bool enable);
 701 /*
 702  * The double __builtin_constant_p is because gcc will give us an error
 703  * if we try to allocate the static variable to fmt if it is not a
 704  * constant. Even with the outer if statement optimizing out.
 705  */
 706 #define event_trace_printk(ip, fmt, args...)                            \
 707 do {                                                                    \
 708         __trace_printk_check_format(fmt, ##args);                       \
 709         tracing_record_cmdline(current);                                \
 710         if (__builtin_constant_p(fmt)) {                                \
 711                 static const char *trace_printk_fmt                     \
 712                   __attribute__((section("__trace_printk_fmt"))) =      \
 713                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 714                                                                         \
 715                 __trace_bprintk(ip, trace_printk_fmt, ##args);          \
 716         } else                                                          \
 717                 __trace_printk(ip, fmt, ##args);                        \
 718 } while (0)
 719
 720 #ifdef CONFIG_PERF_EVENTS
 721 struct perf_event;
 722
 723 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
 724 DECLARE_PER_CPU(int, bpf_kprobe_override);
 725
 726 extern int  perf_trace_init(struct perf_event *event);
 727 extern void perf_trace_destroy(struct perf_event *event);
 728 extern int  perf_trace_add(struct perf_event *event, int flags);
 729 extern void perf_trace_del(struct perf_event *event, int flags);
 730 #ifdef CONFIG_KPROBE_EVENTS
 731 extern int  perf_kprobe_init(struct perf_event *event, bool is_retprobe);
 732 extern void perf_kprobe_destroy(struct perf_event *event);
 733 extern int bpf_get_kprobe_info(const struct perf_event *event,
 734                                u32 *fd_type, const char **symbol,
 735                                u64 *probe_offset, u64 *probe_addr,
 736                                bool perf_type_tracepoint);
 737 #endif
 738 #ifdef CONFIG_UPROBE_EVENTS
 739 extern int  perf_uprobe_init(struct perf_event *event,
 740                              unsigned long ref_ctr_offset, bool is_retprobe);
 741 extern void perf_uprobe_destroy(struct perf_event *event);
 742 extern int bpf_get_uprobe_info(const struct perf_event *event,
 743                                u32 *fd_type, const char **filename,
 744                                u64 *probe_offset, bool perf_type_tracepoint);
 745 #endif
 746 extern int  ftrace_profile_set_filter(struct perf_event *event, int event_id,
 747                                      char *filter_str);
 748 extern void ftrace_profile_free_filter(struct perf_event *event);
 749 void perf_trace_buf_update(void *record, u16 type);
 750 void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
 751
 752 void bpf_trace_run1(struct bpf_prog *prog, u64 arg1);
 753 void bpf_trace_run2(struct bpf_prog *prog, u64 arg1, u64 arg2);
 754 void bpf_trace_run3(struct bpf_prog *prog, u64 arg1, u64 arg2,
 755                     u64 arg3);
 756 void bpf_trace_run4(struct bpf_prog *prog, u64 arg1, u64 arg2,
 757                     u64 arg3, u64 arg4);
 758 void bpf_trace_run5(struct bpf_prog *prog, u64 arg1, u64 arg2,
 759                     u64 arg3, u64 arg4, u64 arg5);
 760 void bpf_trace_run6(struct bpf_prog *prog, u64 arg1, u64 arg2,
 761                     u64 arg3, u64 arg4, u64 arg5, u64 arg6);
 762 void bpf_trace_run7(struct bpf_prog *prog, u64 arg1, u64 arg2,
 763                     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7);
 764 void bpf_trace_run8(struct bpf_prog *prog, u64 arg1, u64 arg2,
 765                     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
 766                     u64 arg8);
 767 void bpf_trace_run9(struct bpf_prog *prog, u64 arg1, u64 arg2,
 768                     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
 769                     u64 arg8, u64 arg9);
 770 void bpf_trace_run10(struct bpf_prog *prog, u64 arg1, u64 arg2,
 771                      u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
 772                      u64 arg8, u64 arg9, u64 arg10);
 773 void bpf_trace_run11(struct bpf_prog *prog, u64 arg1, u64 arg2,
 774                      u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
 775                      u64 arg8, u64 arg9, u64 arg10, u64 arg11);
 776 void bpf_trace_run12(struct bpf_prog *prog, u64 arg1, u64 arg2,
 777                      u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
 778                      u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12);
 779 void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
 780                                struct trace_event_call *call, u64 count,
 781                                struct pt_regs *regs, struct hlist_head *head,
 782                                struct task_struct *task);
 783
 784 static inline void
 785 perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
 786                        u64 count, struct pt_regs *regs, void *head,
 787                        struct task_struct *task)
 788 {
 789         perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
 790 }
 791
 792 #endif
 793
 794 #endif /* _LINUX_TRACE_EVENT_H */