include/lttng/events-internal.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events-internal.h
   4  *
   5  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  */
   7
   8 #ifndef _LTTNG_EVENTS_INTERNAL_H
   9 #define _LTTNG_EVENTS_INTERNAL_H
  10
  11 #include <wrapper/compiler_attributes.h>
  12
  13 #include <lttng/events.h>
  14
  15 struct lttng_syscall_filter;
  16 struct lttng_metadata_cache;
  17 struct perf_event;
  18 struct perf_event_attr;
  19 struct lttng_kernel_ring_buffer_config;
  20
  21 enum lttng_enabler_format_type {
  22         LTTNG_ENABLER_FORMAT_STAR_GLOB,
  23         LTTNG_ENABLER_FORMAT_NAME,
  24 };
  25
  26 enum channel_type {
  27         PER_CPU_CHANNEL,
  28         METADATA_CHANNEL,
  29 };
  30
  31 /*
  32  * Objects in a linked-list of enablers, owned by an event.
  33  */
  34 struct lttng_enabler_ref {
  35         struct list_head node;                  /* enabler ref list */
  36         struct lttng_enabler *ref;              /* backward ref */
  37 };
  38
  39 struct lttng_krp;                               /* Kretprobe handling */
  40
  41 struct lttng_uprobe_handler {
  42         struct lttng_kernel_event_common *event;
  43         loff_t offset;
  44         struct uprobe_consumer up_consumer;
  45         struct list_head node;
  46 };
  47
  48 struct lttng_kprobe {
  49         struct kprobe kp;
  50         char *symbol_name;
  51 };
  52
  53 struct lttng_uprobe {
  54         struct inode *inode;
  55         struct list_head head;
  56 };
  57
  58 enum lttng_syscall_entryexit {
  59         LTTNG_SYSCALL_ENTRY,
  60         LTTNG_SYSCALL_EXIT,
  61 };
  62
  63 enum lttng_syscall_abi {
  64         LTTNG_SYSCALL_ABI_NATIVE,
  65         LTTNG_SYSCALL_ABI_COMPAT,
  66 };
  67
  68 struct lttng_kernel_event_common_private {
  69         struct lttng_kernel_event_common *pub;          /* Public event interface */
  70
  71         const struct lttng_kernel_event_desc *desc;
  72         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
  73         struct list_head enablers_ref_head;
  74         int registered;                                 /* has reg'd tracepoint probe */
  75         uint64_t user_token;
  76
  77         int has_enablers_without_filter_bytecode;
  78         /* list of struct lttng_kernel_bytecode_runtime, sorted by seqnum */
  79         struct list_head filter_bytecode_runtime_head;
  80         enum lttng_kernel_abi_instrumentation instrumentation;
  81         /* Selected by instrumentation */
  82         union {
  83                 struct lttng_kprobe kprobe;
  84                 struct lttng_uprobe uprobe;
  85                 struct {
  86                         struct lttng_krp *lttng_krp;
  87                         char *symbol_name;
  88                 } kretprobe;
  89                 struct {
  90                         enum lttng_syscall_entryexit entryexit;
  91                         enum lttng_syscall_abi abi;
  92                         struct hlist_node node;                 /* chain registered syscall event_notifier */
  93                         unsigned int syscall_id;
  94                 } syscall;
  95         } u;
  96 };
  97
  98 struct lttng_kernel_event_recorder_private {
  99         struct lttng_kernel_event_common_private parent;
 100
 101         struct lttng_kernel_event_recorder *pub;        /* Public event interface */
 102         struct list_head node;                          /* Event recorder list */
 103         struct hlist_node hlist;                        /* Hash table of event recorders */
 104         struct lttng_kernel_ctx *ctx;
 105         unsigned int id;
 106         unsigned int metadata_dumped:1;
 107 };
 108
 109 struct lttng_kernel_event_notifier_private {
 110         struct lttng_kernel_event_common_private parent;
 111
 112         struct lttng_kernel_event_notifier *pub;        /* Public event notifier interface */
 113         struct lttng_event_notifier_group *group;       /* weak ref */
 114         size_t num_captures;                            /* Needed to allocate the msgpack array. */
 115         uint64_t error_counter_index;
 116         struct list_head node;                          /* Event notifier list */
 117         struct hlist_node hlist;                        /* Hash table of event notifiers */
 118         struct list_head capture_bytecode_runtime_head;
 119
 120 };
 121
 122 struct lttng_kernel_channel_common_private {
 123         struct lttng_kernel_channel_common *pub;
 124
 125         struct file *file;                      /* File associated to channel */
 126         unsigned int sys_enter_registered:1,
 127                 sys_exit_registered:1,
 128                 tstate:1;                       /* Transient enable state */
 129
 130         struct hlist_head *sc_table;            /* for syscall tracing */
 131         struct hlist_head *compat_sc_table;
 132         struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
 133         struct hlist_head *compat_sc_exit_table;
 134         struct hlist_head sc_unknown;           /* for unknown syscalls */
 135         struct hlist_head sc_compat_unknown;
 136         struct hlist_head sc_exit_unknown;
 137         struct hlist_head compat_sc_exit_unknown;
 138         struct lttng_syscall_filter *sc_filter;
 139         int syscall_all_entry;
 140         int syscall_all_exit;
 141 };
 142
 143 struct lttng_kernel_channel_buffer_private {
 144         struct lttng_kernel_channel_common_private parent;
 145
 146         struct lttng_kernel_channel_buffer *pub;
 147
 148         unsigned int id;                        /* Channel ID */
 149         unsigned int free_event_id;             /* Next event ID to allocate */
 150         int header_type;                        /* 0: unset, 1: compact, 2: large */
 151
 152         enum channel_type channel_type;
 153         struct lttng_kernel_ctx *ctx;
 154         struct lttng_kernel_ring_buffer_channel *rb_chan;               /* Ring buffer channel */
 155         unsigned int metadata_dumped:1;
 156         struct list_head node;                  /* Channel list in session */
 157         struct lttng_transport *transport;
 158 };
 159
 160 enum lttng_kernel_bytecode_interpreter_ret {
 161         LTTNG_KERNEL_BYTECODE_INTERPRETER_ERROR = -1,
 162         LTTNG_KERNEL_BYTECODE_INTERPRETER_OK = 0,
 163 };
 164
 165 enum lttng_kernel_bytecode_filter_result {
 166         LTTNG_KERNEL_BYTECODE_FILTER_ACCEPT = 0,
 167         LTTNG_KERNEL_BYTECODE_FILTER_REJECT = 1,
 168 };
 169
 170 struct lttng_kernel_bytecode_filter_ctx {
 171         enum lttng_kernel_bytecode_filter_result result;
 172 };
 173
 174 struct lttng_interpreter_output;
 175
 176 enum lttng_kernel_bytecode_type {
 177         LTTNG_KERNEL_BYTECODE_TYPE_FILTER,
 178         LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE,
 179 };
 180
 181 struct lttng_kernel_bytecode_node {
 182         enum lttng_kernel_bytecode_type type;
 183         struct list_head node;
 184         struct lttng_enabler *enabler;
 185         struct {
 186                 uint32_t len;
 187                 uint32_t reloc_offset;
 188                 uint64_t seqnum;
 189                 char data[];
 190         } bc;
 191 };
 192
 193 struct lttng_kernel_bytecode_runtime {
 194         /* Associated bytecode */
 195         enum lttng_kernel_bytecode_type type;
 196         struct lttng_kernel_bytecode_node *bc;
 197         int (*interpreter_func)(struct lttng_kernel_bytecode_runtime *kernel_bytecode,
 198                                 const char *interpreter_stack_data,
 199                                 struct lttng_kernel_probe_ctx *lttng_probe_ctx,
 200                                 void *caller_ctx);
 201         int link_failed;
 202         struct list_head node;  /* list of bytecode runtime in event */
 203         struct lttng_kernel_ctx *ctx;
 204 };
 205
 206 /*
 207  * Enabler field, within whatever object is enabling an event. Target of
 208  * backward reference.
 209  */
 210 struct lttng_enabler {
 211         enum lttng_enabler_format_type format_type;
 212
 213         /* head list of struct lttng_kernel_bytecode_node */
 214         struct list_head filter_bytecode_head;
 215
 216         struct lttng_kernel_abi_event event_param;
 217         unsigned int enabled:1;
 218
 219         uint64_t user_token;            /* User-provided token. */
 220 };
 221
 222 struct lttng_event_enabler {
 223         struct lttng_enabler base;
 224         struct list_head node;          /* per-session list of enablers */
 225         bool published;                 /* published in per-session list. */
 226         struct lttng_kernel_channel_buffer *chan;
 227 };
 228
 229 struct lttng_event_notifier_enabler {
 230         struct lttng_enabler base;
 231         uint64_t error_counter_index;
 232         struct list_head node;  /* List of event_notifier enablers */
 233         struct lttng_event_notifier_group *group;
 234
 235         /* head list of struct lttng_kernel_bytecode_node */
 236         struct list_head capture_bytecode_head;
 237         uint64_t num_captures;
 238 };
 239
 240 struct lttng_ctx_value {
 241         union {
 242                 int64_t s64;
 243                 const char *str;
 244                 double d;
 245         } u;
 246 };
 247
 248 /*
 249  * We need to keep this perf counter field separately from struct
 250  * lttng_kernel_ctx_field because cpu hotplug needs fixed-location addresses.
 251  */
 252 struct lttng_perf_counter_field {
 253 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
 254         struct lttng_cpuhp_node cpuhp_prepare;
 255         struct lttng_cpuhp_node cpuhp_online;
 256 #else
 257         struct notifier_block nb;
 258         int hp_enable;
 259 #endif
 260         struct perf_event_attr *attr;
 261         struct perf_event **e;  /* per-cpu array */
 262         char *name;
 263         struct lttng_kernel_event_field *event_field;
 264 };
 265
 266 struct lttng_kernel_ctx_field {
 267         const struct lttng_kernel_event_field *event_field;
 268         size_t (*get_size)(void *priv, struct lttng_kernel_probe_ctx *probe_ctx,
 269                         size_t offset);
 270         void (*record)(void *priv, struct lttng_kernel_probe_ctx *probe_ctx,
 271                         struct lttng_kernel_ring_buffer_ctx *ctx,
 272                         struct lttng_kernel_channel_buffer *chan);
 273         void (*get_value)(void *priv, struct lttng_kernel_probe_ctx *probe_ctx,
 274                         struct lttng_ctx_value *value);
 275         void (*destroy)(void *priv);
 276         void *priv;
 277 };
 278
 279 struct lttng_kernel_ctx {
 280         struct lttng_kernel_ctx_field *fields;
 281         unsigned int nr_fields;
 282         unsigned int allocated_fields;
 283         size_t largest_align;   /* in bytes */
 284 };
 285
 286 struct lttng_metadata_cache {
 287         char *data;                     /* Metadata cache */
 288         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 289         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 290         atomic_t producing;             /* Metadata being produced (incomplete) */
 291         struct kref refcount;           /* Metadata cache usage */
 292         struct list_head metadata_stream;       /* Metadata stream list */
 293         uuid_le uuid;                   /* Trace session unique ID (copy) */
 294         struct mutex lock;              /* Produce/consume lock */
 295         uint64_t version;               /* Current version of the metadata */
 296 };
 297
 298 struct lttng_metadata_stream {
 299         void *priv;                     /* Ring buffer private data */
 300         struct lttng_metadata_cache *metadata_cache;
 301         unsigned int metadata_in;       /* Bytes read from the cache */
 302         unsigned int metadata_out;      /* Bytes consumed from stream */
 303         int finalized;                  /* Has channel been finalized */
 304         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 305         struct list_head list;          /* Stream list */
 306         struct lttng_transport *transport;
 307         uint64_t version;               /* Current version of the metadata cache */
 308         bool coherent;                  /* Stream in a coherent state */
 309 };
 310
 311 struct lttng_kernel_channel_buffer_ops_private {
 312         struct lttng_kernel_channel_buffer_ops *pub;    /* Public channel buffer ops interface */
 313
 314         struct lttng_kernel_ring_buffer_channel *(*channel_create)(const char *name,
 315                                 void *priv,
 316                                 void *buf_addr,
 317                                 size_t subbuf_size, size_t num_subbuf,
 318                                 unsigned int switch_timer_interval,
 319                                 unsigned int read_timer_interval);
 320         void (*channel_destroy)(struct lttng_kernel_ring_buffer_channel *chan);
 321         struct lttng_kernel_ring_buffer *(*buffer_read_open)(struct lttng_kernel_ring_buffer_channel *chan);
 322         int (*buffer_has_read_closed_stream)(struct lttng_kernel_ring_buffer_channel *chan);
 323         void (*buffer_read_close)(struct lttng_kernel_ring_buffer *buf);
 324         /*
 325          * packet_avail_size returns the available size in the current
 326          * packet. Note that the size returned is only a hint, since it
 327          * may change due to concurrent writes.
 328          */
 329         size_t (*packet_avail_size)(struct lttng_kernel_ring_buffer_channel *chan);
 330         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct lttng_kernel_ring_buffer_channel *chan, int cpu);
 331         wait_queue_head_t *(*get_hp_wait_queue)(struct lttng_kernel_ring_buffer_channel *chan);
 332         int (*is_finalized)(struct lttng_kernel_ring_buffer_channel *chan);
 333         int (*is_disabled)(struct lttng_kernel_ring_buffer_channel *chan);
 334         int (*timestamp_begin) (const struct lttng_kernel_ring_buffer_config *config,
 335                         struct lttng_kernel_ring_buffer *bufb,
 336                         uint64_t *timestamp_begin);
 337         int (*timestamp_end) (const struct lttng_kernel_ring_buffer_config *config,
 338                         struct lttng_kernel_ring_buffer *bufb,
 339                         uint64_t *timestamp_end);
 340         int (*events_discarded) (const struct lttng_kernel_ring_buffer_config *config,
 341                         struct lttng_kernel_ring_buffer *bufb,
 342                         uint64_t *events_discarded);
 343         int (*content_size) (const struct lttng_kernel_ring_buffer_config *config,
 344                         struct lttng_kernel_ring_buffer *bufb,
 345                         uint64_t *content_size);
 346         int (*packet_size) (const struct lttng_kernel_ring_buffer_config *config,
 347                         struct lttng_kernel_ring_buffer *bufb,
 348                         uint64_t *packet_size);
 349         int (*stream_id) (const struct lttng_kernel_ring_buffer_config *config,
 350                         struct lttng_kernel_ring_buffer *bufb,
 351                         uint64_t *stream_id);
 352         int (*current_timestamp) (const struct lttng_kernel_ring_buffer_config *config,
 353                         struct lttng_kernel_ring_buffer *bufb,
 354                         uint64_t *ts);
 355         int (*sequence_number) (const struct lttng_kernel_ring_buffer_config *config,
 356                         struct lttng_kernel_ring_buffer *bufb,
 357                         uint64_t *seq);
 358         int (*instance_id) (const struct lttng_kernel_ring_buffer_config *config,
 359                         struct lttng_kernel_ring_buffer *bufb,
 360                         uint64_t *id);
 361 };
 362
 363 struct lttng_counter_ops {
 364         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 365                         const size_t *max_nr_elem,      /* for each dimension */
 366                         int64_t global_sum_step);
 367         void (*counter_destroy)(struct lib_counter *counter);
 368         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 369                         int64_t v);
 370         /*
 371          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 372          * the global aggregation counter if @cpu == -1.
 373          */
 374         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 375                          int64_t *value, bool *overflow, bool *underflow);
 376         /*
 377          * counter_aggregate returns the total sum of all per-cpu counters and
 378          * the global aggregation counter.
 379          */
 380         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 381                         int64_t *value, bool *overflow, bool *underflow);
 382         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 383 };
 384
 385 struct lttng_counter {
 386         struct file *file;              /* File associated to counter. */
 387         struct file *owner;
 388         struct lttng_counter_transport *transport;
 389         struct lib_counter *counter;
 390         struct lttng_counter_ops *ops;
 391 };
 392
 393 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 394 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 395
 396 struct lttng_event_notifier_ht {
 397         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 398 };
 399
 400 struct lttng_event_notifier_group {
 401         struct file *file;              /* File associated to event notifier group */
 402         struct file *notif_file;        /* File used to expose notifications to userspace. */
 403         struct list_head node;          /* event notifier group list */
 404         struct list_head enablers_head; /* List of enablers */
 405         struct list_head event_notifiers_head; /* List of event notifier */
 406         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 407         struct lttng_kernel_channel_buffer_ops *ops;
 408         struct lttng_transport *transport;
 409         struct lttng_kernel_ring_buffer_channel *chan;          /* Ring buffer channel for event notifier group. */
 410         struct lttng_kernel_ring_buffer *buf;   /* Ring buffer for event notifier group. */
 411         wait_queue_head_t read_wait;
 412         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 413         struct lttng_kernel_event_notifier *sc_unknown; /* for unknown syscalls */
 414         struct lttng_kernel_event_notifier *sc_compat_unknown;
 415
 416         struct lttng_syscall_filter *sc_filter;
 417
 418         struct hlist_head *event_notifier_syscall_dispatch;
 419         struct hlist_head *event_notifier_compat_syscall_dispatch;
 420         struct hlist_head *event_notifier_exit_syscall_dispatch;
 421         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 422
 423         struct hlist_head event_notifier_unknown_syscall_dispatch;
 424         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 425         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 426         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 427
 428         int syscall_all_entry;
 429         int syscall_all_exit;
 430
 431         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 432
 433         struct lttng_counter *error_counter;
 434         size_t error_counter_len;
 435 };
 436
 437 struct lttng_transport {
 438         char *name;
 439         struct module *owner;
 440         struct list_head node;
 441         struct lttng_kernel_channel_buffer_ops ops;
 442 };
 443
 444 struct lttng_counter_transport {
 445         char *name;
 446         struct module *owner;
 447         struct list_head node;
 448         struct lttng_counter_ops ops;
 449 };
 450
 451 #define LTTNG_EVENT_HT_BITS             12
 452 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 453
 454 struct lttng_event_ht {
 455         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 456 };
 457
 458 struct lttng_kernel_session_private {
 459         struct lttng_kernel_session *pub;       /* Public session interface */
 460
 461         int been_active;                        /* Has trace session been active ? */
 462         struct file *file;                      /* File associated to session */
 463         struct list_head chan;                  /* Channel list head */
 464         struct list_head events;                /* Event list head */
 465         struct list_head list;                  /* Session list */
 466         unsigned int free_chan_id;              /* Next chan ID to allocate */
 467         uuid_le uuid;                           /* Trace session unique ID */
 468         struct lttng_metadata_cache *metadata_cache;
 469         unsigned int metadata_dumped:1,
 470                 tstate:1;                       /* Transient enable state */
 471         /* List of event enablers */
 472         struct list_head enablers_head;
 473         /* Hash table of events */
 474         struct lttng_event_ht events_ht;
 475         char name[LTTNG_KERNEL_ABI_SESSION_NAME_LEN];
 476         char creation_time[LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN];
 477 };
 478
 479 struct lttng_id_hash_node {
 480         struct hlist_node hlist;
 481         int id;
 482 };
 483
 484 enum tracker_type {
 485         TRACKER_PID,
 486         TRACKER_VPID,
 487         TRACKER_UID,
 488         TRACKER_VUID,
 489         TRACKER_GID,
 490         TRACKER_VGID,
 491
 492         TRACKER_UNKNOWN,
 493 };
 494
 495 struct lttng_kernel_id_tracker_private {
 496         struct lttng_kernel_id_tracker *pub;    /* Public interface */
 497
 498         struct lttng_kernel_session *session;
 499         enum tracker_type tracker_type;
 500 };
 501
 502 extern struct lttng_kernel_ctx *lttng_static_ctx;
 503
 504 static inline
 505 const struct lttng_kernel_type_integer *lttng_kernel_get_type_integer(const struct lttng_kernel_type_common *type)
 506 {
 507         if (type->type != lttng_kernel_type_integer)
 508                 return NULL;
 509         return container_of(type, const struct lttng_kernel_type_integer, parent);
 510 }
 511
 512 static inline
 513 const struct lttng_kernel_type_string *lttng_kernel_get_type_string(const struct lttng_kernel_type_common *type)
 514 {
 515         if (type->type != lttng_kernel_type_string)
 516                 return NULL;
 517         return container_of(type, const struct lttng_kernel_type_string, parent);
 518 }
 519
 520 static inline
 521 const struct lttng_kernel_type_enum *lttng_kernel_get_type_enum(const struct lttng_kernel_type_common *type)
 522 {
 523         if (type->type != lttng_kernel_type_enum)
 524                 return NULL;
 525         return container_of(type, const struct lttng_kernel_type_enum, parent);
 526 }
 527
 528 static inline
 529 const struct lttng_kernel_type_array *lttng_kernel_get_type_array(const struct lttng_kernel_type_common *type)
 530 {
 531         if (type->type != lttng_kernel_type_array)
 532                 return NULL;
 533         return container_of(type, const struct lttng_kernel_type_array, parent);
 534 }
 535
 536 static inline
 537 const struct lttng_kernel_type_sequence *lttng_kernel_get_type_sequence(const struct lttng_kernel_type_common *type)
 538 {
 539         if (type->type != lttng_kernel_type_sequence)
 540                 return NULL;
 541         return container_of(type, const struct lttng_kernel_type_sequence, parent);
 542 }
 543
 544 static inline
 545 const struct lttng_kernel_type_struct *lttng_kernel_get_type_struct(const struct lttng_kernel_type_common *type)
 546 {
 547         if (type->type != lttng_kernel_type_struct)
 548                 return NULL;
 549         return container_of(type, const struct lttng_kernel_type_struct, parent);
 550 }
 551
 552 static inline
 553 const struct lttng_kernel_type_variant *lttng_kernel_get_type_variant(const struct lttng_kernel_type_common *type)
 554 {
 555         if (type->type != lttng_kernel_type_variant)
 556                 return NULL;
 557         return container_of(type, const struct lttng_kernel_type_variant, parent);
 558 }
 559
 560 static inline bool lttng_kernel_type_is_bytewise_integer(const struct lttng_kernel_type_common *type)
 561 {
 562         const struct lttng_kernel_type_integer *type_integer = lttng_kernel_get_type_integer(type);
 563
 564         if (!type_integer)
 565                 return false;
 566         switch (type_integer->size) {
 567         case 8:
 568                 lttng_fallthrough;
 569         case 16:
 570                 lttng_fallthrough;
 571         case 32:
 572                 lttng_fallthrough;
 573         case 64:
 574                 break;
 575         default:
 576                 return false;
 577         }
 578         return true;
 579 }
 580
 581 int lttng_kernel_interpret_event_filter(const struct lttng_kernel_event_common *event,
 582                 const char *interpreter_stack_data,
 583                 struct lttng_kernel_probe_ctx *probe_ctx,
 584                 void *event_filter_ctx);
 585
 586 static inline
 587 struct lttng_enabler *lttng_event_enabler_as_enabler(
 588                 struct lttng_event_enabler *event_enabler)
 589 {
 590         return &event_enabler->base;
 591 }
 592
 593 static inline
 594 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 595                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 596 {
 597         return &event_notifier_enabler->base;
 598 }
 599
 600 int lttng_context_init(void);
 601 void lttng_context_exit(void);
 602 int lttng_kernel_context_append(struct lttng_kernel_ctx **ctx_p,
 603                 const struct lttng_kernel_ctx_field *f);
 604 void lttng_kernel_context_remove_last(struct lttng_kernel_ctx **ctx_p);
 605 struct lttng_kernel_ctx_field *lttng_kernel_get_context_field_from_index(struct lttng_kernel_ctx *ctx,
 606                 size_t index);
 607 int lttng_kernel_find_context(struct lttng_kernel_ctx *ctx, const char *name);
 608 int lttng_kernel_get_context_index(struct lttng_kernel_ctx *ctx, const char *name);
 609 void lttng_kernel_destroy_context(struct lttng_kernel_ctx *ctx);
 610 int lttng_add_pid_to_ctx(struct lttng_kernel_ctx **ctx);
 611 int lttng_add_cpu_id_to_ctx(struct lttng_kernel_ctx **ctx);
 612 int lttng_add_procname_to_ctx(struct lttng_kernel_ctx **ctx);
 613 int lttng_add_prio_to_ctx(struct lttng_kernel_ctx **ctx);
 614 int lttng_add_nice_to_ctx(struct lttng_kernel_ctx **ctx);
 615 int lttng_add_vpid_to_ctx(struct lttng_kernel_ctx **ctx);
 616 int lttng_add_tid_to_ctx(struct lttng_kernel_ctx **ctx);
 617 int lttng_add_vtid_to_ctx(struct lttng_kernel_ctx **ctx);
 618 int lttng_add_ppid_to_ctx(struct lttng_kernel_ctx **ctx);
 619 int lttng_add_vppid_to_ctx(struct lttng_kernel_ctx **ctx);
 620 int lttng_add_hostname_to_ctx(struct lttng_kernel_ctx **ctx);
 621 int lttng_add_interruptible_to_ctx(struct lttng_kernel_ctx **ctx);
 622 int lttng_add_need_reschedule_to_ctx(struct lttng_kernel_ctx **ctx);
 623 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 624 int lttng_add_preemptible_to_ctx(struct lttng_kernel_ctx **ctx);
 625 #else
 626 static inline
 627 int lttng_add_preemptible_to_ctx(struct lttng_kernel_ctx **ctx)
 628 {
 629         return -ENOSYS;
 630 }
 631 #endif
 632 #ifdef CONFIG_PREEMPT_RT_FULL
 633 int lttng_add_migratable_to_ctx(struct lttng_kernel_ctx **ctx);
 634 #else
 635 static inline
 636 int lttng_add_migratable_to_ctx(struct lttng_kernel_ctx **ctx)
 637 {
 638         return -ENOSYS;
 639 }
 640 #endif
 641
 642 int lttng_add_callstack_to_ctx(struct lttng_kernel_ctx **ctx, int type);
 643
 644 #if defined(CONFIG_CGROUPS) && \
 645         ((LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) || \
 646          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 647 int lttng_add_cgroup_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 648 #else
 649 static inline
 650 int lttng_add_cgroup_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 651 {
 652         return -ENOSYS;
 653 }
 654 #endif
 655
 656 #if defined(CONFIG_IPC_NS) && \
 657         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 658 int lttng_add_ipc_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 659 #else
 660 static inline
 661 int lttng_add_ipc_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 662 {
 663         return -ENOSYS;
 664 }
 665 #endif
 666
 667 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 668         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 669 int lttng_add_mnt_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 670 #else
 671 static inline
 672 int lttng_add_mnt_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 673 {
 674         return -ENOSYS;
 675 }
 676 #endif
 677
 678 #if defined(CONFIG_NET_NS) && \
 679         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 680 int lttng_add_net_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 681 #else
 682 static inline
 683 int lttng_add_net_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 684 {
 685         return -ENOSYS;
 686 }
 687 #endif
 688
 689 #if defined(CONFIG_PID_NS) && \
 690         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 691 int lttng_add_pid_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 692 #else
 693 static inline
 694 int lttng_add_pid_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 695 {
 696         return -ENOSYS;
 697 }
 698 #endif
 699
 700 #if defined(CONFIG_USER_NS) && \
 701         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 702 int lttng_add_user_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 703 #else
 704 static inline
 705 int lttng_add_user_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 706 {
 707         return -ENOSYS;
 708 }
 709 #endif
 710
 711 #if defined(CONFIG_UTS_NS) && \
 712         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 713 int lttng_add_uts_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 714 #else
 715 static inline
 716 int lttng_add_uts_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 717 {
 718         return -ENOSYS;
 719 }
 720 #endif
 721
 722 #if defined(CONFIG_TIME_NS) && \
 723         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \
 724         LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0))
 725 int lttng_add_time_ns_to_ctx(struct lttng_kernel_ctx **ctx);
 726 #else
 727 static inline
 728 int lttng_add_time_ns_to_ctx(struct lttng_kernel_ctx **ctx)
 729 {
 730         return -ENOSYS;
 731 }
 732 #endif
 733
 734 int lttng_add_uid_to_ctx(struct lttng_kernel_ctx **ctx);
 735 int lttng_add_euid_to_ctx(struct lttng_kernel_ctx **ctx);
 736 int lttng_add_suid_to_ctx(struct lttng_kernel_ctx **ctx);
 737 int lttng_add_gid_to_ctx(struct lttng_kernel_ctx **ctx);
 738 int lttng_add_egid_to_ctx(struct lttng_kernel_ctx **ctx);
 739 int lttng_add_sgid_to_ctx(struct lttng_kernel_ctx **ctx);
 740 int lttng_add_vuid_to_ctx(struct lttng_kernel_ctx **ctx);
 741 int lttng_add_veuid_to_ctx(struct lttng_kernel_ctx **ctx);
 742 int lttng_add_vsuid_to_ctx(struct lttng_kernel_ctx **ctx);
 743 int lttng_add_vgid_to_ctx(struct lttng_kernel_ctx **ctx);
 744 int lttng_add_vegid_to_ctx(struct lttng_kernel_ctx **ctx);
 745 int lttng_add_vsgid_to_ctx(struct lttng_kernel_ctx **ctx);
 746
 747 #if defined(CONFIG_PERF_EVENTS)
 748 int lttng_add_perf_counter_to_ctx(uint32_t type,
 749                                   uint64_t config,
 750                                   const char *name,
 751                                   struct lttng_kernel_ctx **ctx);
 752 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 753                 struct lttng_cpuhp_node *node);
 754 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 755                 struct lttng_cpuhp_node *node);
 756 #else
 757 static inline
 758 int lttng_add_perf_counter_to_ctx(uint32_t type,
 759                                   uint64_t config,
 760                                   const char *name,
 761                                   struct lttng_kernel_ctx **ctx)
 762 {
 763         return -ENOSYS;
 764 }
 765 static inline
 766 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 767                 struct lttng_cpuhp_node *node)
 768 {
 769         return 0;
 770 }
 771 static inline
 772 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 773                 struct lttng_cpuhp_node *node)
 774 {
 775         return 0;
 776 }
 777 #endif
 778
 779 struct lttng_event_enabler *lttng_event_enabler_create(
 780                 enum lttng_enabler_format_type format_type,
 781                 struct lttng_kernel_abi_event *event_param,
 782                 struct lttng_kernel_channel_buffer *chan);
 783 void lttng_event_enabler_session_add(struct lttng_kernel_session *session,
 784                 struct lttng_event_enabler *event_enabler);
 785 void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
 786
 787 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 788 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 789 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 790                 struct lttng_event_notifier_group *event_notifier_group,
 791                 enum lttng_enabler_format_type format_type,
 792                 struct lttng_kernel_abi_event_notifier *event_notifier_param);
 793
 794 int lttng_event_notifier_enabler_enable(
 795                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 796 int lttng_event_notifier_enabler_disable(
 797                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 798
 799 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 800                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
 801 int lttng_event_notifier_enabler_attach_filter_bytecode(
 802                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 803                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
 804 int lttng_event_notifier_enabler_attach_capture_bytecode(
 805                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 806                 struct lttng_kernel_abi_capture_bytecode __user *bytecode);
 807
 808 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
 809                 struct lttng_enabler *enabler);
 810
 811 void lttng_enabler_link_bytecode(const struct lttng_kernel_event_desc *event_desc,
 812                 struct lttng_kernel_ctx *ctx,
 813                 struct list_head *instance_bytecode_runtime_head,
 814                 struct list_head *enabler_bytecode_runtime_head);
 815
 816 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 817 int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler);
 818 int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer *chan);
 819 int lttng_syscalls_destroy_event(struct lttng_kernel_channel_buffer *chan);
 820 int lttng_syscall_filter_enable_event(
 821                 struct lttng_kernel_channel_buffer *chan,
 822                 struct lttng_kernel_event_recorder *event);
 823 int lttng_syscall_filter_disable_event(
 824                 struct lttng_kernel_channel_buffer *chan,
 825                 struct lttng_kernel_event_recorder *event);
 826
 827 long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel,
 828                 struct lttng_kernel_abi_syscall_mask __user *usyscall_mask);
 829
 830 int lttng_syscalls_register_event_notifier(
 831                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 832 int lttng_syscalls_create_matching_event_notifiers(
 833                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 834 int lttng_syscalls_unregister_event_notifier_group(struct lttng_event_notifier_group *group);
 835 int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 836 int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 837 #else
 838 static inline int lttng_syscalls_register_event(
 839                 struct lttng_event_enabler *event_enabler)
 840 {
 841         return -ENOSYS;
 842 }
 843
 844 static inline int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer *chan)
 845 {
 846         return 0;
 847 }
 848
 849 static inline int lttng_syscalls_destroy(struct lttng_kernel_channel_buffer *chan)
 850 {
 851         return 0;
 852 }
 853
 854 static inline int lttng_syscall_filter_enable_event(struct lttng_kernel_channel_buffer *chan,
 855                 struct lttng_kernel_event_recorder *event);
 856 {
 857         return -ENOSYS;
 858 }
 859
 860 static inline int lttng_syscall_filter_disable_event(struct lttng_kernel_channel_buffer *chan,
 861                 struct lttng_kernel_event_recorder *event);
 862 {
 863         return -ENOSYS;
 864 }
 865
 866 static inline long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel,
 867                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 868 {
 869         return -ENOSYS;
 870 }
 871
 872 static inline int lttng_syscalls_register_event_notifier(
 873                 struct lttng_event_notifier_group *group)
 874 {
 875         return -ENOSYS;
 876 }
 877
 878 static inline int lttng_syscalls_unregister_event_notifier_group(
 879                 struct lttng_event_notifier_group *group)
 880 {
 881         return 0;
 882 }
 883
 884 static inline int lttng_syscall_filter_enable_event_notifier(
 885                 struct lttng_event_notifier_group *group,
 886                 const char *name)
 887 {
 888         return -ENOSYS;
 889 }
 890
 891 static inline int lttng_syscall_filter_disable_event_notifier(
 892                 struct lttng_event_notifier_group *group,
 893                 const char *name)
 894 {
 895         return -ENOSYS;
 896 }
 897
 898 #endif
 899
 900 #ifdef CONFIG_KPROBES
 901 int lttng_kprobes_register_event(const char *name,
 902                 const char *symbol_name,
 903                 uint64_t offset,
 904                 uint64_t addr,
 905                 struct lttng_kernel_event_recorder *event);
 906 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event);
 907 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
 908 int lttng_kprobes_register_event_notifier(const char *symbol_name,
 909                 uint64_t offset,
 910                 uint64_t addr,
 911                 struct lttng_kernel_event_notifier *event_notifier);
 912 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 913 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
 914 #else
 915 static inline
 916 int lttng_kprobes_register_event(const char *name,
 917                 const char *symbol_name,
 918                 uint64_t offset,
 919                 uint64_t addr,
 920                 struct lttng_kernel_event_recorder *event)
 921 {
 922         return -ENOSYS;
 923 }
 924
 925 static inline
 926 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event)
 927 {
 928 }
 929
 930 static inline
 931 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
 932 {
 933 }
 934
 935 static inline
 936 int lttng_kprobes_register_event_notifier(const char *symbol_name,
 937                 uint64_t offset,
 938                 uint64_t addr,
 939                 struct lttng_kernel_event_notifier *event_notifier)
 940 {
 941         return -ENOSYS;
 942 }
 943
 944 static inline
 945 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
 946 {
 947 }
 948
 949 static inline
 950 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
 951 {
 952 }
 953 #endif
 954
 955 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
 956         struct lttng_kernel_abi_event_callsite __user *callsite);
 957
 958 #ifdef CONFIG_UPROBES
 959 int lttng_uprobes_register_event(const char *name,
 960         int fd, struct lttng_kernel_event_recorder *event);
 961 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
 962         struct lttng_kernel_abi_event_callsite __user *callsite);
 963 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event);
 964 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
 965 int lttng_uprobes_register_event_notifier(const char *name,
 966         int fd, struct lttng_kernel_event_notifier *event_notifier);
 967 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 968 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
 969 #else
 970 static inline
 971 int lttng_uprobes_register_event(const char *name,
 972         int fd, struct lttng_kernel_event_recorder *event)
 973 {
 974         return -ENOSYS;
 975 }
 976
 977 static inline
 978 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
 979         struct lttng_kernel_abi_event_callsite __user *callsite)
 980 {
 981         return -ENOSYS;
 982 }
 983
 984 static inline
 985 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event)
 986 {
 987 }
 988
 989 static inline
 990 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
 991 {
 992 }
 993
 994 static inline
 995 int lttng_uprobes_register_event_notifier(const char *name,
 996         int fd, struct lttng_kernel_event_notifier *event_notifier)
 997 {
 998         return -ENOSYS;
 999 }
1000
1001 static inline
1002 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1003 {
1004 }
1005
1006 static inline
1007 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
1008 {
1009 }
1010 #endif
1011
1012 #ifdef CONFIG_KRETPROBES
1013 int lttng_kretprobes_register(const char *name,
1014                 const char *symbol_name,
1015                 uint64_t offset,
1016                 uint64_t addr,
1017                 struct lttng_kernel_event_recorder *event_entry,
1018                 struct lttng_kernel_event_recorder *event_exit);
1019 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event);
1020 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event);
1021 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1022         int enable);
1023 #else
1024 static inline
1025 int lttng_kretprobes_register(const char *name,
1026                 const char *symbol_name,
1027                 uint64_t offset,
1028                 uint64_t addr,
1029                 struct lttng_kernel_event_recorder *event_entry,
1030                 struct lttng_kernel_event_recorder *event_exit)
1031 {
1032         return -ENOSYS;
1033 }
1034
1035 static inline
1036 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event)
1037 {
1038 }
1039
1040 static inline
1041 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event)
1042 {
1043 }
1044
1045 static inline
1046 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1047         int enable)
1048 {
1049         return -ENOSYS;
1050 }
1051 #endif
1052
1053 void lttng_lock_sessions(void);
1054 void lttng_unlock_sessions(void);
1055
1056 struct list_head *lttng_get_probe_list_head(void);
1057
1058 int lttng_fix_pending_events(void);
1059 int lttng_fix_pending_event_notifiers(void);
1060 int lttng_session_active(void);
1061 bool lttng_event_notifier_active(void);
1062
1063 struct lttng_kernel_session *lttng_session_create(void);
1064 int lttng_session_enable(struct lttng_kernel_session *session);
1065 int lttng_session_disable(struct lttng_kernel_session *session);
1066 void lttng_session_destroy(struct lttng_kernel_session *session);
1067 int lttng_session_metadata_regenerate(struct lttng_kernel_session *session);
1068 int lttng_session_statedump(struct lttng_kernel_session *session);
1069 void metadata_cache_destroy(struct kref *kref);
1070
1071 struct lttng_counter *lttng_kernel_counter_create(
1072                 const char *counter_transport_name, size_t number_dimensions,
1073                 const size_t *dimensions_sizes);
1074 int lttng_kernel_counter_read(struct lttng_counter *counter,
1075                 const size_t *dimension_indexes, int32_t cpu,
1076                 int64_t *val, bool *overflow, bool *underflow);
1077 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
1078                 const size_t *dimension_indexes, int64_t *val,
1079                 bool *overflow, bool *underflow);
1080 int lttng_kernel_counter_clear(struct lttng_counter *counter,
1081                 const size_t *dimension_indexes);
1082 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
1083 int lttng_event_notifier_group_create_error_counter(
1084                 struct file *event_notifier_group_file,
1085                 const struct lttng_kernel_abi_counter_conf *error_counter_conf);
1086 void lttng_event_notifier_group_destroy(
1087                 struct lttng_event_notifier_group *event_notifier_group);
1088
1089 struct lttng_kernel_channel_buffer *lttng_channel_create(struct lttng_kernel_session *session,
1090                                        const char *transport_name,
1091                                        void *buf_addr,
1092                                        size_t subbuf_size, size_t num_subbuf,
1093                                        unsigned int switch_timer_interval,
1094                                        unsigned int read_timer_interval,
1095                                        enum channel_type channel_type);
1096 struct lttng_kernel_channel_buffer *lttng_global_channel_create(struct lttng_kernel_session *session,
1097                                        int overwrite, void *buf_addr,
1098                                        size_t subbuf_size, size_t num_subbuf,
1099                                        unsigned int switch_timer_interval,
1100                                        unsigned int read_timer_interval);
1101
1102 void lttng_metadata_channel_destroy(struct lttng_kernel_channel_buffer *chan);
1103 struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler,
1104                                 const struct lttng_kernel_event_desc *event_desc);
1105 struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_event_enabler *event_enabler,
1106                                 const struct lttng_kernel_event_desc *event_desc);
1107 struct lttng_kernel_event_recorder *lttng_event_compat_old_create(struct lttng_kernel_channel_buffer *chan,
1108                 struct lttng_kernel_abi_old_event *old_event_param,
1109                 const struct lttng_kernel_event_desc *internal_desc);
1110
1111 struct lttng_kernel_event_notifier *lttng_event_notifier_create(
1112                                 const struct lttng_kernel_event_desc *event_notifier_desc,
1113                                 uint64_t id,
1114                                 uint64_t error_counter_idx,
1115                                 struct lttng_event_notifier_group *event_notifier_group,
1116                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
1117                                 enum lttng_kernel_abi_instrumentation itype);
1118 struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
1119                                 const struct lttng_kernel_event_desc *event_notifier_desc,
1120                                 uint64_t id,
1121                                 uint64_t error_counter_idx,
1122                                 struct lttng_event_notifier_group *event_notifier_group,
1123                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
1124                                 enum lttng_kernel_abi_instrumentation itype);
1125
1126 int lttng_channel_enable(struct lttng_kernel_channel_buffer *channel);
1127 int lttng_channel_disable(struct lttng_kernel_channel_buffer *channel);
1128 int lttng_event_enable(struct lttng_kernel_event_common *event);
1129 int lttng_event_disable(struct lttng_kernel_event_common *event);
1130
1131 void lttng_transport_register(struct lttng_transport *transport);
1132 void lttng_transport_unregister(struct lttng_transport *transport);
1133
1134 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
1135 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
1136
1137 void synchronize_trace(void);
1138 int lttng_abi_init(void);
1139 int lttng_abi_compat_old_init(void);
1140 void lttng_abi_exit(void);
1141 void lttng_abi_compat_old_exit(void);
1142
1143 const struct lttng_kernel_event_desc *lttng_event_desc_get(const char *name);
1144 void lttng_event_desc_put(const struct lttng_kernel_event_desc *desc);
1145 int lttng_probes_init(void);
1146 void lttng_probes_exit(void);
1147
1148 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
1149                 struct lttng_kernel_ring_buffer_channel *chan, bool *coherent);
1150
1151 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
1152 int lttng_id_tracker_empty_set(struct lttng_kernel_id_tracker *lf);
1153 int lttng_id_tracker_init(struct lttng_kernel_id_tracker *lf,
1154                 struct lttng_kernel_session *session,
1155                 enum tracker_type type);
1156 void lttng_id_tracker_fini(struct lttng_kernel_id_tracker *lf);
1157 void lttng_id_tracker_destroy(struct lttng_kernel_id_tracker *lf, bool rcu);
1158 int lttng_id_tracker_add(struct lttng_kernel_id_tracker *lf, int id);
1159 int lttng_id_tracker_del(struct lttng_kernel_id_tracker *lf, int id);
1160
1161 int lttng_session_track_id(struct lttng_kernel_session *session,
1162                 enum tracker_type tracker_type, int id);
1163 int lttng_session_untrack_id(struct lttng_kernel_session *session,
1164                 enum tracker_type tracker_type, int id);
1165
1166 int lttng_session_list_tracker_ids(struct lttng_kernel_session *session,
1167                 enum tracker_type tracker_type);
1168
1169 void lttng_clock_ref(void);
1170 void lttng_clock_unref(void);
1171
1172 void lttng_free_event_filter_runtime(struct lttng_kernel_event_common *event);
1173
1174 int lttng_probes_init(void);
1175
1176 int lttng_logger_init(void);
1177 void lttng_logger_exit(void);
1178
1179 extern int lttng_statedump_start(struct lttng_kernel_session *session);
1180
1181 int lttng_calibrate(struct lttng_kernel_abi_calibrate *calibrate);
1182
1183 extern const struct file_operations lttng_tracepoint_list_fops;
1184 extern const struct file_operations lttng_syscall_list_fops;
1185
1186 #define lttng_kernel_static_ctx_field(_event_field, _get_size, _record, _get_value, _destroy, _priv)    \
1187         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_ctx_field, {                                 \
1188                 .event_field = (_event_field),                                                          \
1189                 .get_size = (_get_size),                                                                \
1190                 .record = (_record),                                                                    \
1191                 .get_value = (_get_value),                                                              \
1192                 .destroy = (_destroy),                                                                  \
1193                 .priv = (_priv),                                                                        \
1194         })
1195
1196 #endif /* _LTTNG_EVENTS_INTERNAL_H */