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