include/lttng/events.h

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