lttng-events.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  *
   3  * lttng-events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <linux/version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <lttng-cpuhotplug.h>
  18 #include <linux/uuid.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng-tracer.h>
  21 #include <lttng-abi.h>
  22 #include <lttng-abi-old.h>
  23 #include <linux/irq_work.h>
  24
  25 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  26
  27 struct lttng_channel;
  28 struct lttng_session;
  29 struct lttng_metadata_cache;
  30 struct lib_ring_buffer_ctx;
  31 struct perf_event;
  32 struct perf_event_attr;
  33 struct lib_ring_buffer_config;
  34
  35 /* Type description */
  36
  37 enum abstract_types {
  38         atype_integer,
  39         atype_enum,
  40         atype_array,
  41         atype_sequence,
  42         atype_string,
  43         atype_struct,
  44         atype_array_compound,           /* Array of compound types. */
  45         atype_sequence_compound,        /* Sequence of compound types. */
  46         atype_variant,
  47         atype_array_bitfield,
  48         atype_sequence_bitfield,
  49         NR_ABSTRACT_TYPES,
  50 };
  51
  52 enum lttng_string_encodings {
  53         lttng_encode_none = 0,
  54         lttng_encode_UTF8 = 1,
  55         lttng_encode_ASCII = 2,
  56         NR_STRING_ENCODINGS,
  57 };
  58
  59 enum channel_type {
  60         PER_CPU_CHANNEL,
  61         METADATA_CHANNEL,
  62 };
  63
  64 struct lttng_enum_value {
  65         unsigned long long value;
  66         unsigned int signedness:1;
  67 };
  68
  69 struct lttng_enum_entry {
  70         struct lttng_enum_value start, end;     /* start and end are inclusive */
  71         const char *string;
  72         struct {
  73                 unsigned int is_auto:1;
  74         } options;
  75 };
  76
  77 #define __type_integer(_type, _size, _alignment, _signedness,   \
  78                 _byte_order, _base, _encoding)  \
  79         {                                                       \
  80             .atype = atype_integer,                             \
  81             .u.basic.integer =                                  \
  82                 {                                               \
  83                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  84                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  85                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  86                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  87                   .base = _base,                                \
  88                   .encoding = lttng_encode_##_encoding,         \
  89                 },                                              \
  90         }                                                       \
  91
  92 struct lttng_integer_type {
  93         unsigned int size;              /* in bits */
  94         unsigned short alignment;       /* in bits */
  95         unsigned int signedness:1,
  96                 reverse_byte_order:1;
  97         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  98         enum lttng_string_encodings encoding;
  99 };
 100
 101 union _lttng_basic_type {
 102         struct lttng_integer_type integer;
 103         struct {
 104                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 105                 struct lttng_integer_type container_type;
 106         } enumeration;
 107         struct {
 108                 enum lttng_string_encodings encoding;
 109         } string;
 110 };
 111
 112 struct lttng_basic_type {
 113         enum abstract_types atype;
 114         union {
 115                 union _lttng_basic_type basic;
 116         } u;
 117 };
 118
 119 struct lttng_type {
 120         enum abstract_types atype;
 121         union {
 122                 union _lttng_basic_type basic;
 123                 struct {
 124                         struct lttng_basic_type elem_type;
 125                         unsigned int length;            /* num. elems. */
 126                         unsigned int elem_alignment;    /* alignment override */
 127                 } array;
 128                 struct {
 129                         struct lttng_basic_type length_type;
 130                         struct lttng_basic_type elem_type;
 131                         unsigned int elem_alignment;    /* alignment override */
 132                 } sequence;
 133                 struct {
 134                         uint32_t nr_fields;
 135                         struct lttng_event_field *fields; /* Array of fields. */
 136                 } _struct;
 137                 struct {
 138                         struct lttng_type *elem_type;
 139                         unsigned int length;            /* num. elems. */
 140                 } array_compound;
 141                 struct {
 142                         struct lttng_type *elem_type;
 143                         const char *length_name;
 144                 } sequence_compound;
 145                 struct {
 146                         const char *tag_name;
 147                         struct lttng_event_field *choices; /* Array of fields. */
 148                         uint32_t nr_choices;
 149                 } variant;
 150         } u;
 151 };
 152
 153 struct lttng_enum_desc {
 154         const char *name;
 155         const struct lttng_enum_entry *entries;
 156         unsigned int nr_entries;
 157 };
 158
 159 /* Event field description */
 160
 161 struct lttng_event_field {
 162         const char *name;
 163         struct lttng_type type;
 164         unsigned int nowrite:1,         /* do not write into trace */
 165                         user:1;         /* fetch from user-space */
 166 };
 167
 168 union lttng_ctx_value {
 169         int64_t s64;
 170         const char *str;
 171         double d;
 172 };
 173
 174 /*
 175  * We need to keep this perf counter field separately from struct
 176  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 177  */
 178 struct lttng_perf_counter_field {
 179 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 180         struct lttng_cpuhp_node cpuhp_prepare;
 181         struct lttng_cpuhp_node cpuhp_online;
 182 #else
 183         struct notifier_block nb;
 184         int hp_enable;
 185 #endif
 186         struct perf_event_attr *attr;
 187         struct perf_event **e;  /* per-cpu array */
 188 };
 189
 190 struct lttng_probe_ctx {
 191         struct lttng_event *event;
 192         struct lttng_trigger *trigger; // Not sure if we will ever need it.
 193         uint8_t interruptible;
 194 };
 195
 196 struct lttng_ctx_field {
 197         struct lttng_event_field event_field;
 198         size_t (*get_size)(size_t offset);
 199         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 200                                struct lib_ring_buffer_ctx *ctx,
 201                                struct lttng_channel *chan);
 202         void (*record)(struct lttng_ctx_field *field,
 203                        struct lib_ring_buffer_ctx *ctx,
 204                        struct lttng_channel *chan);
 205         void (*get_value)(struct lttng_ctx_field *field,
 206                          struct lttng_probe_ctx *lttng_probe_ctx,
 207                          union lttng_ctx_value *value);
 208         union {
 209                 struct lttng_perf_counter_field *perf_counter;
 210         } u;
 211         void (*destroy)(struct lttng_ctx_field *field);
 212         /*
 213          * Private data to keep state between get_size and record.
 214          * User must perform its own synchronization to protect against
 215          * concurrent and reentrant contexts.
 216          */
 217         void *priv;
 218 };
 219
 220 struct lttng_ctx {
 221         struct lttng_ctx_field *fields;
 222         unsigned int nr_fields;
 223         unsigned int allocated_fields;
 224         size_t largest_align;   /* in bytes */
 225 };
 226
 227 struct lttng_event_desc {
 228         const char *name;               /* lttng-modules name */
 229         const char *kname;              /* Linux kernel name (tracepoints) */
 230         void *probe_callback;
 231         const struct lttng_event_ctx *ctx;      /* context */
 232         const struct lttng_event_field *fields; /* event payload */
 233         unsigned int nr_fields;
 234         struct module *owner;
 235         void *trigger_callback;
 236 };
 237
 238 struct lttng_probe_desc {
 239         const char *provider;
 240         const struct lttng_event_desc **event_desc;
 241         unsigned int nr_events;
 242         struct list_head head;                  /* chain registered probes */
 243         struct list_head lazy_init_head;
 244         int lazy;                               /* lazy registration */
 245 };
 246
 247 struct lttng_krp;                               /* Kretprobe handling */
 248
 249 enum lttng_event_type {
 250         LTTNG_TYPE_EVENT = 0,
 251         LTTNG_TYPE_ENABLER = 1,
 252 };
 253
 254 struct lttng_filter_bytecode_node {
 255         struct list_head node;
 256         struct lttng_enabler *enabler;
 257         /*
 258          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 259          * last field.
 260          */
 261         struct lttng_kernel_filter_bytecode bc;
 262 };
 263
 264 /*
 265  * Filter return value masks.
 266  */
 267 enum lttng_filter_ret {
 268         LTTNG_FILTER_DISCARD = 0,
 269         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 270         /* Other bits are kept for future use. */
 271 };
 272
 273 struct lttng_bytecode_runtime {
 274         /* Associated bytecode */
 275         struct lttng_filter_bytecode_node *bc;
 276         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 277                         const char *filter_stack_data);
 278         int link_failed;
 279         struct list_head node;  /* list of bytecode runtime in event */
 280         struct lttng_ctx *ctx;
 281 };
 282
 283 /*
 284  * Objects in a linked-list of enablers, owned by an event.
 285  */
 286 struct lttng_enabler_ref {
 287         struct list_head node;                  /* enabler ref list */
 288         struct lttng_enabler *ref;              /* backward ref */
 289 };
 290
 291 struct lttng_uprobe_handler {
 292         union {
 293                 struct lttng_event *event;
 294                 struct lttng_trigger *trigger;
 295         } u;
 296         loff_t offset;
 297         struct uprobe_consumer up_consumer;
 298         struct list_head node;
 299 };
 300
 301 struct lttng_kprobe {
 302         struct kprobe kp;
 303         char *symbol_name;
 304 };
 305
 306 struct lttng_uprobe {
 307         struct inode *inode;
 308         struct list_head head;
 309 };
 310
 311 struct lttng_syscall {
 312         struct list_head node;                  /* chain registered syscall trigger */
 313         unsigned int syscall_id;
 314         bool is_compat;
 315 };
 316
 317 /*
 318  * lttng_event structure is referred to by the tracing fast path. It must be
 319  * kept small.
 320  */
 321 struct lttng_event {
 322         enum lttng_event_type evtype;   /* First field. */
 323         unsigned int id;
 324         struct lttng_channel *chan;
 325         int enabled;
 326         const struct lttng_event_desc *desc;
 327         void *filter;
 328         struct lttng_ctx *ctx;
 329         enum lttng_kernel_instrumentation instrumentation;
 330         union {
 331                 struct lttng_kprobe kprobe;
 332                 struct {
 333                         struct lttng_krp *lttng_krp;
 334                         char *symbol_name;
 335                 } kretprobe;
 336                 struct {
 337                         char *symbol_name;
 338                 } ftrace;
 339                 struct lttng_uprobe uprobe;
 340         } u;
 341         struct list_head list;          /* Event list in session */
 342         unsigned int metadata_dumped:1;
 343
 344         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 345         struct list_head enablers_ref_head;
 346         struct hlist_node hlist;        /* session ht of events */
 347         int registered;                 /* has reg'd tracepoint probe */
 348         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 349         struct list_head bytecode_runtime_head;
 350         int has_enablers_without_bytecode;
 351 };
 352
 353 // FIXME: Really similar to lttng_event above. Could those be merged ?
 354 struct lttng_trigger {
 355         enum lttng_event_type evtype;   /* First field. */
 356         uint64_t id;
 357         int enabled;
 358         int registered;                 /* has reg'd tracepoint probe */
 359         const struct lttng_event_desc *desc;
 360         void *filter;
 361         struct list_head list;          /* Trigger list in trigger group */
 362
 363         enum lttng_kernel_instrumentation instrumentation;
 364         union {
 365                 struct lttng_kprobe kprobe;
 366                 struct lttng_uprobe uprobe;
 367                 struct lttng_syscall syscall;
 368         } u;
 369
 370         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 371         struct list_head enablers_ref_head;
 372         struct hlist_node hlist;        /* session ht of triggers */
 373         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 374         struct list_head bytecode_runtime_head;
 375         int has_enablers_without_bytecode;
 376
 377         void (*send_notification)(struct lttng_trigger *trigger);
 378         struct lttng_trigger_group *group; /* Weak ref */
 379 };
 380
 381 enum lttng_enabler_format_type {
 382         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 383         LTTNG_ENABLER_FORMAT_NAME,
 384 };
 385
 386 /*
 387  * Enabler field, within whatever object is enabling an event. Target of
 388  * backward reference.
 389  */
 390 struct lttng_enabler {
 391         enum lttng_event_type evtype;   /* First field. */
 392
 393         enum lttng_enabler_format_type format_type;
 394
 395         /* head list of struct lttng_ust_filter_bytecode_node */
 396         struct list_head filter_bytecode_head;
 397
 398         struct lttng_kernel_event event_param;
 399         unsigned int enabled:1;
 400 };
 401
 402 struct lttng_event_enabler {
 403         struct lttng_enabler base;
 404         struct list_head node;  /* per-session list of enablers */
 405         struct lttng_channel *chan;
 406         /*
 407          * Unused, but kept around to make it explicit that the tracer can do
 408          * it.
 409          */
 410         struct lttng_ctx *ctx;
 411 };
 412
 413 struct lttng_trigger_enabler {
 414         struct lttng_enabler base;
 415         uint64_t id;
 416         struct list_head node;  /* List of trigger enablers */
 417         struct lttng_trigger_group *group;
 418 };
 419
 420 static inline
 421 struct lttng_enabler *lttng_event_enabler_as_enabler(
 422                 struct lttng_event_enabler *event_enabler)
 423 {
 424         return &event_enabler->base;
 425 }
 426
 427 static inline
 428 struct lttng_enabler *lttng_trigger_enabler_as_enabler(
 429                 struct lttng_trigger_enabler *trigger_enabler)
 430 {
 431         return &trigger_enabler->base;
 432 }
 433
 434 struct lttng_channel_ops {
 435         struct channel *(*channel_create)(const char *name,
 436                                 void *priv,
 437                                 void *buf_addr,
 438                                 size_t subbuf_size, size_t num_subbuf,
 439                                 unsigned int switch_timer_interval,
 440                                 unsigned int read_timer_interval);
 441         void (*channel_destroy)(struct channel *chan);
 442         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 443         int (*buffer_has_read_closed_stream)(struct channel *chan);
 444         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 445         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 446                              uint32_t event_id);
 447         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 448         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 449                             size_t len);
 450         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 451                                       const void *src, size_t len);
 452         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 453                              int c, size_t len);
 454         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 455                              size_t len);
 456         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 457                                        const char __user *src, size_t len);
 458         /*
 459          * packet_avail_size returns the available size in the current
 460          * packet. Note that the size returned is only a hint, since it
 461          * may change due to concurrent writes.
 462          */
 463         size_t (*packet_avail_size)(struct channel *chan);
 464         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 465         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 466         int (*is_finalized)(struct channel *chan);
 467         int (*is_disabled)(struct channel *chan);
 468         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 469                         struct lib_ring_buffer *bufb,
 470                         uint64_t *timestamp_begin);
 471         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 472                         struct lib_ring_buffer *bufb,
 473                         uint64_t *timestamp_end);
 474         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 475                         struct lib_ring_buffer *bufb,
 476                         uint64_t *events_discarded);
 477         int (*content_size) (const struct lib_ring_buffer_config *config,
 478                         struct lib_ring_buffer *bufb,
 479                         uint64_t *content_size);
 480         int (*packet_size) (const struct lib_ring_buffer_config *config,
 481                         struct lib_ring_buffer *bufb,
 482                         uint64_t *packet_size);
 483         int (*stream_id) (const struct lib_ring_buffer_config *config,
 484                         struct lib_ring_buffer *bufb,
 485                         uint64_t *stream_id);
 486         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 487                         struct lib_ring_buffer *bufb,
 488                         uint64_t *ts);
 489         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 490                         struct lib_ring_buffer *bufb,
 491                         uint64_t *seq);
 492         int (*instance_id) (const struct lib_ring_buffer_config *config,
 493                         struct lib_ring_buffer *bufb,
 494                         uint64_t *id);
 495 };
 496
 497 struct lttng_transport {
 498         char *name;
 499         struct module *owner;
 500         struct list_head node;
 501         struct lttng_channel_ops ops;
 502 };
 503
 504 struct lttng_syscall_filter;
 505
 506 #define LTTNG_EVENT_HT_BITS             12
 507 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 508
 509 struct lttng_event_ht {
 510         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 511 };
 512
 513 #define LTTNG_TRIGGER_HT_BITS           12
 514 #define LTTNG_TRIGGER_HT_SIZE           (1U << LTTNG_TRIGGER_HT_BITS)
 515
 516 struct lttng_trigger_ht {
 517         struct hlist_head table[LTTNG_TRIGGER_HT_SIZE];
 518 };
 519
 520 struct lttng_channel {
 521         unsigned int id;
 522         struct channel *chan;           /* Channel buffers */
 523         int enabled;
 524         struct lttng_ctx *ctx;
 525         /* Event ID management */
 526         struct lttng_session *session;
 527         struct file *file;              /* File associated to channel */
 528         unsigned int free_event_id;     /* Next event ID to allocate */
 529         struct list_head list;          /* Channel list */
 530         struct lttng_channel_ops *ops;
 531         struct lttng_transport *transport;
 532         struct lttng_event **sc_table;  /* for syscall tracing */
 533         struct lttng_event **compat_sc_table;
 534         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 535         struct lttng_event **compat_sc_exit_table;
 536         struct lttng_event *sc_unknown; /* for unknown syscalls */
 537         struct lttng_event *sc_compat_unknown;
 538         struct lttng_event *sc_exit_unknown;
 539         struct lttng_event *compat_sc_exit_unknown;
 540         struct lttng_syscall_filter *sc_filter;
 541         int header_type;                /* 0: unset, 1: compact, 2: large */
 542         enum channel_type channel_type;
 543         unsigned int metadata_dumped:1,
 544                 sys_enter_registered:1,
 545                 sys_exit_registered:1,
 546                 syscall_all:1,
 547                 tstate:1;               /* Transient enable state */
 548 };
 549
 550 struct lttng_metadata_stream {
 551         void *priv;                     /* Ring buffer private data */
 552         struct lttng_metadata_cache *metadata_cache;
 553         unsigned int metadata_in;       /* Bytes read from the cache */
 554         unsigned int metadata_out;      /* Bytes consumed from stream */
 555         int finalized;                  /* Has channel been finalized */
 556         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 557         struct list_head list;          /* Stream list */
 558         struct lttng_transport *transport;
 559         uint64_t version;               /* Current version of the metadata cache */
 560 };
 561
 562 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 563
 564 struct lttng_dynamic_len_stack {
 565         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 566         size_t offset;
 567 };
 568
 569 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 570
 571 /*
 572  * struct lttng_id_tracker declared in header due to deferencing of *v
 573  * in RCU_INITIALIZER(v).
 574  */
 575 #define LTTNG_ID_HASH_BITS      6
 576 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 577
 578 enum tracker_type {
 579         TRACKER_PID,
 580         TRACKER_VPID,
 581         TRACKER_UID,
 582         TRACKER_VUID,
 583         TRACKER_GID,
 584         TRACKER_VGID,
 585
 586         TRACKER_UNKNOWN,
 587 };
 588
 589 struct lttng_id_tracker_rcu {
 590         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 591 };
 592
 593 struct lttng_id_tracker {
 594         struct lttng_session *session;
 595         enum tracker_type tracker_type;
 596         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 597 };
 598
 599 struct lttng_id_hash_node {
 600         struct hlist_node hlist;
 601         int id;
 602 };
 603
 604 struct lttng_session {
 605         int active;                     /* Is trace session active ? */
 606         int been_active;                /* Has trace session been active ? */
 607         struct file *file;              /* File associated to session */
 608         struct list_head chan;          /* Channel list head */
 609         struct list_head events;        /* Event list head */
 610         struct list_head list;          /* Session list */
 611         unsigned int free_chan_id;      /* Next chan ID to allocate */
 612         uuid_le uuid;                   /* Trace session unique ID */
 613         struct lttng_metadata_cache *metadata_cache;
 614         struct lttng_id_tracker pid_tracker;
 615         struct lttng_id_tracker vpid_tracker;
 616         struct lttng_id_tracker uid_tracker;
 617         struct lttng_id_tracker vuid_tracker;
 618         struct lttng_id_tracker gid_tracker;
 619         struct lttng_id_tracker vgid_tracker;
 620         unsigned int metadata_dumped:1,
 621                 tstate:1;               /* Transient enable state */
 622         /* List of event enablers */
 623         struct list_head enablers_head;
 624 /* Hash table of events */
 625         struct lttng_event_ht events_ht;
 626         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 627         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 628 };
 629
 630 struct lttng_trigger_group {
 631         struct file *file;              /* File associated to trigger group */
 632         struct file *notif_file;        /* File used to expose notifications to userspace. */
 633         struct list_head node;          /* Trigger group list */
 634         struct list_head enablers_head; /* List of enablers */
 635         struct list_head triggers_head; /* List of triggers */
 636         struct lttng_trigger_ht triggers_ht; /* Hash table of triggers */
 637         struct lttng_ctx *ctx;              /* Contexts for filters. */
 638         struct lttng_channel_ops *ops;
 639         struct lttng_transport *transport;
 640         struct channel *chan;           /* Ring buffer channel for trigger group. */
 641         struct lib_ring_buffer *buf;    /* Ring buffer for trigger group. */
 642         wait_queue_head_t read_wait;
 643         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 644
 645         struct list_head *trigger_syscall_dispatch;
 646         struct list_head *trigger_compat_syscall_dispatch;
 647
 648         unsigned int syscall_all:1,
 649                 sys_enter_registered:1;
 650 };
 651
 652 struct lttng_metadata_cache {
 653         char *data;                     /* Metadata cache */
 654         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 655         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 656         struct kref refcount;           /* Metadata cache usage */
 657         struct list_head metadata_stream;       /* Metadata stream list */
 658         uuid_le uuid;                   /* Trace session unique ID (copy) */
 659         struct mutex lock;              /* Produce/consume lock */
 660         uint64_t version;               /* Current version of the metadata */
 661 };
 662
 663 void lttng_lock_sessions(void);
 664 void lttng_unlock_sessions(void);
 665
 666 struct list_head *lttng_get_probe_list_head(void);
 667
 668 struct lttng_event_enabler *lttng_event_enabler_create(
 669                 enum lttng_enabler_format_type format_type,
 670                 struct lttng_kernel_event *event_param,
 671                 struct lttng_channel *chan);
 672
 673 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 674 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 675 struct lttng_trigger_enabler *lttng_trigger_enabler_create(
 676                 struct lttng_trigger_group *trigger_group,
 677                 enum lttng_enabler_format_type format_type,
 678                 struct lttng_kernel_trigger *trigger_param);
 679
 680 int lttng_trigger_enabler_enable(struct lttng_trigger_enabler *trigger_enabler);
 681 int lttng_trigger_enabler_disable(struct lttng_trigger_enabler *trigger_enabler);
 682 int lttng_fix_pending_events(void);
 683 int lttng_fix_pending_triggers(void);
 684 int lttng_session_active(void);
 685 bool lttng_trigger_active(void);
 686
 687 struct lttng_session *lttng_session_create(void);
 688 int lttng_session_enable(struct lttng_session *session);
 689 int lttng_session_disable(struct lttng_session *session);
 690 void lttng_session_destroy(struct lttng_session *session);
 691 int lttng_session_metadata_regenerate(struct lttng_session *session);
 692 int lttng_session_statedump(struct lttng_session *session);
 693 void metadata_cache_destroy(struct kref *kref);
 694
 695 struct lttng_trigger_group *lttng_trigger_group_create(void);
 696 void lttng_trigger_group_destroy(struct lttng_trigger_group *trigger_group);
 697
 698 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 699                                        const char *transport_name,
 700                                        void *buf_addr,
 701                                        size_t subbuf_size, size_t num_subbuf,
 702                                        unsigned int switch_timer_interval,
 703                                        unsigned int read_timer_interval,
 704                                        enum channel_type channel_type);
 705 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 706                                        int overwrite, void *buf_addr,
 707                                        size_t subbuf_size, size_t num_subbuf,
 708                                        unsigned int switch_timer_interval,
 709                                        unsigned int read_timer_interval);
 710
 711 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 712 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 713                                 struct lttng_kernel_event *event_param,
 714                                 void *filter,
 715                                 const struct lttng_event_desc *event_desc,
 716                                 enum lttng_kernel_instrumentation itype);
 717 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 718                                 struct lttng_kernel_event *event_param,
 719                                 void *filter,
 720                                 const struct lttng_event_desc *event_desc,
 721                                 enum lttng_kernel_instrumentation itype);
 722 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 723                 struct lttng_kernel_old_event *old_event_param,
 724                 void *filter,
 725                 const struct lttng_event_desc *internal_desc);
 726
 727 struct lttng_trigger *lttng_trigger_create(
 728                                 const struct lttng_event_desc *trigger_desc,
 729                                 uint64_t id,
 730                                 struct lttng_trigger_group *trigger_group,
 731                                 struct lttng_kernel_trigger *trigger_param,
 732                                 void *filter,
 733                                 enum lttng_kernel_instrumentation itype);
 734 struct lttng_trigger *_lttng_trigger_create(
 735                                 const struct lttng_event_desc *trigger_desc,
 736                                 uint64_t id,
 737                                 struct lttng_trigger_group *trigger_group,
 738                                 struct lttng_kernel_trigger *trigger_param,
 739                                 void *filter,
 740                                 enum lttng_kernel_instrumentation itype);
 741
 742 int lttng_channel_enable(struct lttng_channel *channel);
 743 int lttng_channel_disable(struct lttng_channel *channel);
 744 int lttng_event_enable(struct lttng_event *event);
 745 int lttng_event_disable(struct lttng_event *event);
 746
 747 int lttng_trigger_enable(struct lttng_trigger *trigger);
 748 int lttng_trigger_disable(struct lttng_trigger *trigger);
 749
 750 void lttng_transport_register(struct lttng_transport *transport);
 751 void lttng_transport_unregister(struct lttng_transport *transport);
 752
 753 void synchronize_trace(void);
 754 int lttng_abi_init(void);
 755 int lttng_abi_compat_old_init(void);
 756 void lttng_abi_exit(void);
 757 void lttng_abi_compat_old_exit(void);
 758
 759 int lttng_probe_register(struct lttng_probe_desc *desc);
 760 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 761 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 762 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 763 int lttng_probes_init(void);
 764 void lttng_probes_exit(void);
 765
 766 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 767                 struct channel *chan);
 768
 769 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 770 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 771 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 772 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 773 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 774 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 775
 776 int lttng_session_track_id(struct lttng_session *session,
 777                 enum tracker_type tracker_type, int id);
 778 int lttng_session_untrack_id(struct lttng_session *session,
 779                 enum tracker_type tracker_type, int id);
 780
 781 int lttng_session_list_tracker_ids(struct lttng_session *session,
 782                 enum tracker_type tracker_type);
 783
 784 void lttng_clock_ref(void);
 785 void lttng_clock_unref(void);
 786
 787 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 788                 struct lttng_enabler *enabler);
 789
 790 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 791 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 792 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 793 int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 794                 const char *name);
 795 int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 796                 const char *name);
 797 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 798                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 799
 800 int lttng_syscalls_register_trigger(struct lttng_trigger_enabler *trigger_enabler, void *filter);
 801 int lttng_syscals_create_matching_triggers(struct lttng_trigger_enabler *trigger_enabler, void *filter);
 802 int lttng_syscalls_unregister_trigger(struct lttng_trigger_group *group);
 803 int lttng_syscall_filter_enable_trigger(struct lttng_trigger *trigger);
 804 int lttng_syscall_filter_disable_trigger(struct lttng_trigger *trigger);
 805 #else
 806 static inline int lttng_syscalls_register_event(
 807                 struct lttng_channel *chan, void *filter)
 808 {
 809         return -ENOSYS;
 810 }
 811
 812 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 813 {
 814         return 0;
 815 }
 816
 817 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 818                 const char *name)
 819 {
 820         return -ENOSYS;
 821 }
 822
 823 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 824                 const char *name)
 825 {
 826         return -ENOSYS;
 827 }
 828
 829 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 830                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 831 {
 832         return -ENOSYS;
 833 }
 834
 835 static inline int lttng_syscalls_register_trigger(
 836                 struct lttng_trigger_group *group, void *filter)
 837 {
 838         return -ENOSYS;
 839 }
 840
 841 static inline int lttng_syscalls_unregister_trigger(struct lttng_trigger_group *group)
 842 {
 843         return 0;
 844 }
 845
 846 static inline int lttng_syscall_filter_enable_trigger(struct lttng_trigger_group *group,
 847                 const char *name)
 848 {
 849         return -ENOSYS;
 850 }
 851
 852 static inline int lttng_syscall_filter_disable_trigger(struct lttng_trigger_group *group,
 853                 const char *name)
 854 {
 855         return -ENOSYS;
 856 }
 857
 858 #endif
 859
 860 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 861 int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler,
 862                 struct lttng_kernel_filter_bytecode __user *bytecode);
 863 int lttng_trigger_enabler_attach_bytecode(struct lttng_trigger_enabler *trigger_enabler,
 864                 struct lttng_kernel_filter_bytecode __user *bytecode);
 865
 866 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 867                 struct lttng_ctx *ctx,
 868                 struct list_head *bytecode_runtime_head,
 869                 struct lttng_enabler *enabler);
 870
 871 int lttng_probes_init(void);
 872
 873 extern struct lttng_ctx *lttng_static_ctx;
 874
 875 int lttng_context_init(void);
 876 void lttng_context_exit(void);
 877 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 878 void lttng_context_update(struct lttng_ctx *ctx);
 879 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 880 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 881 void lttng_remove_context_field(struct lttng_ctx **ctx,
 882                                 struct lttng_ctx_field *field);
 883 void lttng_destroy_context(struct lttng_ctx *ctx);
 884 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 885 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 886 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 887 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 888 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 889 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 890 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 891 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 892 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 893 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 894 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 895 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 896 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 897 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 898 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 899 #else
 900 static inline
 901 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 902 {
 903         return -ENOSYS;
 904 }
 905 #endif
 906 #ifdef CONFIG_PREEMPT_RT_FULL
 907 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 908 #else
 909 static inline
 910 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 911 {
 912         return -ENOSYS;
 913 }
 914 #endif
 915
 916 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 917
 918 #if defined(CONFIG_CGROUPS) && \
 919         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 920          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 921 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 922 #else
 923 static inline
 924 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 925 {
 926         return -ENOSYS;
 927 }
 928 #endif
 929
 930 #if defined(CONFIG_IPC_NS) && \
 931         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 932 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 933 #else
 934 static inline
 935 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 936 {
 937         return -ENOSYS;
 938 }
 939 #endif
 940
 941 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 942         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 943 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 944 #else
 945 static inline
 946 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 947 {
 948         return -ENOSYS;
 949 }
 950 #endif
 951
 952 #if defined(CONFIG_NET_NS) && \
 953         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 954 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 955 #else
 956 static inline
 957 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
 958 {
 959         return -ENOSYS;
 960 }
 961 #endif
 962
 963 #if defined(CONFIG_PID_NS) && \
 964         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 965 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 966 #else
 967 static inline
 968 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
 969 {
 970         return -ENOSYS;
 971 }
 972 #endif
 973
 974 #if defined(CONFIG_USER_NS) && \
 975         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 976 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 977 #else
 978 static inline
 979 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
 980 {
 981         return -ENOSYS;
 982 }
 983 #endif
 984
 985 #if defined(CONFIG_UTS_NS) && \
 986         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 987 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 988 #else
 989 static inline
 990 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
 991 {
 992         return -ENOSYS;
 993 }
 994 #endif
 995
 996 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
 997 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
 998 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
 999 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1000 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1001 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1002 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1003 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1004 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1005 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1006 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1007 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1008
1009 #if defined(CONFIG_PERF_EVENTS)
1010 int lttng_add_perf_counter_to_ctx(uint32_t type,
1011                                   uint64_t config,
1012                                   const char *name,
1013                                   struct lttng_ctx **ctx);
1014 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1015                 struct lttng_cpuhp_node *node);
1016 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1017                 struct lttng_cpuhp_node *node);
1018 #else
1019 static inline
1020 int lttng_add_perf_counter_to_ctx(uint32_t type,
1021                                   uint64_t config,
1022                                   const char *name,
1023                                   struct lttng_ctx **ctx)
1024 {
1025         return -ENOSYS;
1026 }
1027 static inline
1028 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1029                 struct lttng_cpuhp_node *node)
1030 {
1031         return 0;
1032 }
1033 static inline
1034 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1035                 struct lttng_cpuhp_node *node)
1036 {
1037         return 0;
1038 }
1039 #endif
1040
1041 int lttng_logger_init(void);
1042 void lttng_logger_exit(void);
1043
1044 extern int lttng_statedump_start(struct lttng_session *session);
1045
1046 #ifdef CONFIG_KPROBES
1047 int lttng_kprobes_register_event(const char *name,
1048                 const char *symbol_name,
1049                 uint64_t offset,
1050                 uint64_t addr,
1051                 struct lttng_event *event);
1052 void lttng_kprobes_unregister_event(struct lttng_event *event);
1053 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1054 int lttng_kprobes_register_trigger(const char *symbol_name,
1055                 uint64_t offset,
1056                 uint64_t addr,
1057                 struct lttng_trigger *trigger);
1058 void lttng_kprobes_unregister_trigger(struct lttng_trigger *trigger);
1059 void lttng_kprobes_destroy_trigger_private(struct lttng_trigger *trigger);
1060 #else
1061 static inline
1062 int lttng_kprobes_register_event(const char *name,
1063                 const char *symbol_name,
1064                 uint64_t offset,
1065                 uint64_t addr,
1066                 struct lttng_event *event)
1067 {
1068         return -ENOSYS;
1069 }
1070
1071 static inline
1072 void lttng_kprobes_unregister_event(struct lttng_event *event)
1073 {
1074 }
1075
1076 static inline
1077 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1078 {
1079 }
1080
1081 static inline
1082 int lttng_kprobes_register_trigger(const char *symbol_name,
1083                 uint64_t offset,
1084                 uint64_t addr,
1085                 struct lttng_trigger *trigger)
1086 {
1087         return -ENOSYS;
1088 }
1089
1090 static inline
1091 void lttng_kprobes_unregister_trigger(struct lttng_trigger *trigger)
1092 {
1093 }
1094
1095 static inline
1096 void lttng_kprobes_destroy_trigger_private(struct lttng_trigger *trigger)
1097 {
1098 }
1099 #endif
1100
1101 int lttng_event_add_callsite(struct lttng_event *event,
1102         struct lttng_kernel_event_callsite *callsite);
1103
1104 int lttng_trigger_add_callsite(struct lttng_trigger *trigger,
1105         struct lttng_kernel_event_callsite *callsite);
1106
1107 #ifdef CONFIG_UPROBES
1108 int lttng_uprobes_register_event(const char *name,
1109         int fd, struct lttng_event *event);
1110 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1111         struct lttng_kernel_event_callsite *callsite);
1112 void lttng_uprobes_unregister_event(struct lttng_event *event);
1113 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1114 int lttng_uprobes_register_trigger(const char *name,
1115         int fd, struct lttng_trigger *trigger);
1116 int lttng_uprobes_trigger_add_callsite(struct lttng_trigger *trigger,
1117         struct lttng_kernel_event_callsite *callsite);
1118 void lttng_uprobes_unregister_trigger(struct lttng_trigger *trigger);
1119 void lttng_uprobes_destroy_trigger_private(struct lttng_trigger *trigger);
1120 #else
1121 static inline
1122 int lttng_uprobes_register_event(const char *name,
1123         int fd, struct lttng_event *event)
1124 {
1125         return -ENOSYS;
1126 }
1127
1128 static inline
1129 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1130         struct lttng_kernel_event_callsite *callsite)
1131 {
1132         return -ENOSYS;
1133 }
1134
1135 static inline
1136 void lttng_uprobes_unregister_event(struct lttng_event *event)
1137 {
1138 }
1139
1140 static inline
1141 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1142 {
1143 }
1144
1145 static inline
1146 int lttng_uprobes_register_trigger(const char *name,
1147         int fd, struct lttng_trigger *trigger)
1148 {
1149         return -ENOSYS;
1150 }
1151
1152 static inline
1153 int lttng_uprobes_trigger_add_callsite(struct lttng_trigger *trigger,
1154         struct lttng_kernel_event_callsite *callsite)
1155 {
1156         return -ENOSYS;
1157 }
1158
1159 static inline
1160 void lttng_uprobes_unregister_trigger(struct lttng_trigger *trigger)
1161 {
1162 }
1163
1164 static inline
1165 void lttng_uprobes_destroy_trigger_private(struct lttng_trigger *trigger)
1166 {
1167 }
1168 #endif
1169
1170 #ifdef CONFIG_KRETPROBES
1171 int lttng_kretprobes_register(const char *name,
1172                 const char *symbol_name,
1173                 uint64_t offset,
1174                 uint64_t addr,
1175                 struct lttng_event *event_entry,
1176                 struct lttng_event *event_exit);
1177 void lttng_kretprobes_unregister(struct lttng_event *event);
1178 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1179 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1180         int enable);
1181 #else
1182 static inline
1183 int lttng_kretprobes_register(const char *name,
1184                 const char *symbol_name,
1185                 uint64_t offset,
1186                 uint64_t addr,
1187                 struct lttng_event *event_entry,
1188                 struct lttng_event *event_exit)
1189 {
1190         return -ENOSYS;
1191 }
1192
1193 static inline
1194 void lttng_kretprobes_unregister(struct lttng_event *event)
1195 {
1196 }
1197
1198 static inline
1199 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1200 {
1201 }
1202
1203 static inline
1204 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1205         int enable)
1206 {
1207         return -ENOSYS;
1208 }
1209 #endif
1210
1211 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
1212 int lttng_ftrace_register(const char *name,
1213                           const char *symbol_name,
1214                           struct lttng_event *event);
1215 void lttng_ftrace_unregister(struct lttng_event *event);
1216 void lttng_ftrace_destroy_private(struct lttng_event *event);
1217 #else
1218 static inline
1219 int lttng_ftrace_register(const char *name,
1220                           const char *symbol_name,
1221                           struct lttng_event *event)
1222 {
1223         return -ENOSYS;
1224 }
1225
1226 static inline
1227 void lttng_ftrace_unregister(struct lttng_event *event)
1228 {
1229 }
1230
1231 static inline
1232 void lttng_ftrace_destroy_private(struct lttng_event *event)
1233 {
1234 }
1235 #endif
1236
1237 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1238
1239 extern const struct file_operations lttng_tracepoint_list_fops;
1240 extern const struct file_operations lttng_syscall_list_fops;
1241
1242 #define TRACEPOINT_HAS_DATA_ARG
1243
1244 #endif /* _LTTNG_EVENTS_H */