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