include/lttng/events.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <linux/version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <linux/uuid.h>
  18 #include <linux/irq_work.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng/cpuhotplug.h>
  21 #include <lttng/tracer.h>
  22 #include <lttng/abi.h>
  23 #include <lttng/abi-old.h>
  24 #include <lttng/endian.h>
  25
  26 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lib_ring_buffer_ctx;
  32 struct perf_event;
  33 struct perf_event_attr;
  34 struct lib_ring_buffer_config;
  35
  36 /* Type description */
  37
  38 enum abstract_types {
  39         atype_integer,
  40         atype_string,
  41         atype_enum_nestable,
  42         atype_array_nestable,
  43         atype_sequence_nestable,
  44         atype_struct_nestable,
  45         atype_variant_nestable,
  46         NR_ABSTRACT_TYPES,
  47 };
  48
  49 enum lttng_string_encodings {
  50         lttng_encode_none = 0,
  51         lttng_encode_UTF8 = 1,
  52         lttng_encode_ASCII = 2,
  53         NR_STRING_ENCODINGS,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_enum_entry {
  67         struct lttng_enum_value start, end;     /* start and end are inclusive */
  68         const char *string;
  69         struct {
  70                 unsigned int is_auto:1;
  71         } options;
  72 };
  73
  74 #define __type_integer(_type, _size, _alignment, _signedness,   \
  75                 _byte_order, _base, _encoding)  \
  76         {                                                       \
  77             .atype = atype_integer,                             \
  78             .u.integer =                                        \
  79                 {                                               \
  80                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  81                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  82                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  83                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  84                   .base = _base,                                \
  85                   .encoding = lttng_encode_##_encoding,         \
  86                 },                                              \
  87         }                                                       \
  88
  89 struct lttng_integer_type {
  90         unsigned int size;              /* in bits */
  91         unsigned short alignment;       /* in bits */
  92         unsigned int signedness:1,
  93                 reverse_byte_order:1;
  94         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  95         enum lttng_string_encodings encoding;
  96 };
  97
  98 struct lttng_type {
  99         enum abstract_types atype;
 100         union {
 101                 struct lttng_integer_type integer;
 102                 struct {
 103                         enum lttng_string_encodings encoding;
 104                 } string;
 105                 struct {
 106                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 107                         const struct lttng_type *container_type;
 108                 } enum_nestable;
 109                 struct {
 110                         const struct lttng_type *elem_type;
 111                         unsigned int length;                    /* Num. elems. */
 112                         unsigned int alignment;
 113                 } array_nestable;
 114                 struct {
 115                         const char *length_name;                /* Length field name. */
 116                         const struct lttng_type *elem_type;
 117                         unsigned int alignment;                 /* Alignment before elements. */
 118                 } sequence_nestable;
 119                 struct {
 120                         unsigned int nr_fields;
 121                         const struct lttng_event_field *fields; /* Array of fields. */
 122                         unsigned int alignment;
 123                 } struct_nestable;
 124                 struct {
 125                         const char *tag_name;
 126                         const struct lttng_event_field *choices; /* Array of fields. */
 127                         unsigned int nr_choices;
 128                         unsigned int alignment;
 129                 } variant_nestable;
 130         } u;
 131 };
 132
 133 struct lttng_enum_desc {
 134         const char *name;
 135         const struct lttng_enum_entry *entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_event_field {
 142         const char *name;
 143         struct lttng_type type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1,         /* fetch from user-space */
 146                         nofilter:1;     /* do not consider for filter */
 147 };
 148
 149 union lttng_ctx_value {
 150         int64_t s64;
 151         const char *str;
 152         double d;
 153 };
 154
 155 /*
 156  * We need to keep this perf counter field separately from struct
 157  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 158  */
 159 struct lttng_perf_counter_field {
 160 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 161         struct lttng_cpuhp_node cpuhp_prepare;
 162         struct lttng_cpuhp_node cpuhp_online;
 163 #else
 164         struct notifier_block nb;
 165         int hp_enable;
 166 #endif
 167         struct perf_event_attr *attr;
 168         struct perf_event **e;  /* per-cpu array */
 169 };
 170
 171 struct lttng_probe_ctx {
 172         struct lttng_event *event;
 173         struct lttng_event_notifier *event_notifier; // Not sure if we will ever need it.
 174         uint8_t interruptible;
 175 };
 176
 177 struct lttng_ctx_field {
 178         struct lttng_event_field event_field;
 179         size_t (*get_size)(size_t offset);
 180         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 181                                struct lib_ring_buffer_ctx *ctx,
 182                                struct lttng_channel *chan);
 183         void (*record)(struct lttng_ctx_field *field,
 184                        struct lib_ring_buffer_ctx *ctx,
 185                        struct lttng_channel *chan);
 186         void (*get_value)(struct lttng_ctx_field *field,
 187                          struct lttng_probe_ctx *lttng_probe_ctx,
 188                          union lttng_ctx_value *value);
 189         union {
 190                 struct lttng_perf_counter_field *perf_counter;
 191         } u;
 192         void (*destroy)(struct lttng_ctx_field *field);
 193         /*
 194          * Private data to keep state between get_size and record.
 195          * User must perform its own synchronization to protect against
 196          * concurrent and reentrant contexts.
 197          */
 198         void *priv;
 199 };
 200
 201 struct lttng_ctx {
 202         struct lttng_ctx_field *fields;
 203         unsigned int nr_fields;
 204         unsigned int allocated_fields;
 205         size_t largest_align;   /* in bytes */
 206 };
 207
 208 struct lttng_event_desc {
 209         const char *name;               /* lttng-modules name */
 210         const char *kname;              /* Linux kernel name (tracepoints) */
 211         void *probe_callback;
 212         const struct lttng_event_ctx *ctx;      /* context */
 213         const struct lttng_event_field *fields; /* event payload */
 214         unsigned int nr_fields;
 215         struct module *owner;
 216         void *event_notifier_callback;
 217 };
 218
 219 struct lttng_probe_desc {
 220         const char *provider;
 221         const struct lttng_event_desc **event_desc;
 222         unsigned int nr_events;
 223         struct list_head head;                  /* chain registered probes */
 224         struct list_head lazy_init_head;
 225         int lazy;                               /* lazy registration */
 226 };
 227
 228 struct lttng_krp;                               /* Kretprobe handling */
 229
 230 enum lttng_event_type {
 231         LTTNG_TYPE_EVENT = 0,
 232         LTTNG_TYPE_ENABLER = 1,
 233 };
 234
 235 enum lttng_bytecode_node_type {
 236         LTTNG_BYTECODE_NODE_TYPE_FILTER,
 237         LTTNG_BYTECODE_NODE_TYPE_CAPTURE,
 238 };
 239
 240 struct lttng_bytecode_node {
 241         enum lttng_bytecode_node_type type;
 242         struct list_head node;
 243         struct lttng_enabler *enabler;
 244         struct {
 245                 uint32_t len;
 246                 uint32_t reloc_offset;
 247                 uint64_t seqnum;
 248                 char data[];
 249         } bc;
 250 };
 251
 252 /*
 253  * Bytecode interpreter return value masks.
 254  */
 255 enum lttng_bytecode_interpreter_ret {
 256         LTTNG_INTERPRETER_DISCARD = 0,
 257         LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
 258         /* Other bits are kept for future use. */
 259 };
 260
 261 struct lttng_interpreter_output;
 262
 263 struct lttng_bytecode_runtime {
 264         /* Associated bytecode */
 265         struct lttng_bytecode_node *bc;
 266         union {
 267                 uint64_t (*filter)(void *filter_data,
 268                                 struct lttng_probe_ctx *lttng_probe_ctx,
 269                                 const char *filter_stack_data);
 270                 uint64_t (*capture)(void *filter_data,
 271                                 struct lttng_probe_ctx *lttng_probe_ctx,
 272                                 const char *capture_stack_data,
 273                                 struct lttng_interpreter_output *output);
 274         } interpreter_funcs;
 275         int link_failed;
 276         struct list_head node;  /* list of bytecode runtime in event */
 277         struct lttng_ctx *ctx;
 278 };
 279
 280 /*
 281  * Objects in a linked-list of enablers, owned by an event.
 282  */
 283 struct lttng_enabler_ref {
 284         struct list_head node;                  /* enabler ref list */
 285         struct lttng_enabler *ref;              /* backward ref */
 286 };
 287
 288 struct lttng_uprobe_handler {
 289         union {
 290                 struct lttng_event *event;
 291                 struct lttng_event_notifier *event_notifier;
 292         } u;
 293         loff_t offset;
 294         struct uprobe_consumer up_consumer;
 295         struct list_head node;
 296 };
 297
 298 struct lttng_kprobe {
 299         struct kprobe kp;
 300         char *symbol_name;
 301 };
 302
 303 struct lttng_uprobe {
 304         struct inode *inode;
 305         struct list_head head;
 306 };
 307
 308 enum lttng_syscall_entryexit {
 309         LTTNG_SYSCALL_ENTRY,
 310         LTTNG_SYSCALL_EXIT,
 311 };
 312
 313 enum lttng_syscall_abi {
 314         LTTNG_SYSCALL_ABI_NATIVE,
 315         LTTNG_SYSCALL_ABI_COMPAT,
 316 };
 317
 318 /*
 319  * lttng_event structure is referred to by the tracing fast path. It must be
 320  * kept small.
 321  */
 322 struct lttng_event {
 323         enum lttng_event_type evtype;   /* First field. */
 324         unsigned int id;
 325         struct lttng_channel *chan;
 326         int enabled;
 327         const struct lttng_event_desc *desc;
 328         void *filter;
 329         struct lttng_ctx *ctx;
 330         enum lttng_kernel_instrumentation instrumentation;
 331         union {
 332                 struct lttng_kprobe kprobe;
 333                 struct {
 334                         struct lttng_krp *lttng_krp;
 335                         char *symbol_name;
 336                 } kretprobe;
 337                 struct lttng_uprobe uprobe;
 338                 struct {
 339                         enum lttng_syscall_entryexit entryexit;
 340                         enum lttng_syscall_abi abi;
 341                 } syscall;
 342         } u;
 343         struct list_head list;          /* Event list in session */
 344         unsigned int metadata_dumped:1;
 345
 346         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 347         struct list_head enablers_ref_head;
 348         struct hlist_node hlist;        /* session ht of events */
 349         int registered;                 /* has reg'd tracepoint probe */
 350         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 351         struct list_head filter_bytecode_runtime_head;
 352         int has_enablers_without_bytecode;
 353 };
 354
 355 // FIXME: Really similar to lttng_event above. Could those be merged ?
 356 struct lttng_event_notifier {
 357         enum lttng_event_type evtype;   /* First field. */
 358         uint64_t user_token;
 359         int enabled;
 360         int registered;                 /* has reg'd tracepoint probe */
 361         const struct lttng_event_desc *desc;
 362         void *filter;
 363         struct list_head list;          /* event_notifier list in event_notifier group */
 364
 365         enum lttng_kernel_instrumentation instrumentation;
 366         union {
 367                 struct lttng_kprobe kprobe;
 368                 struct lttng_uprobe uprobe;
 369                 struct {
 370                         enum lttng_syscall_entryexit entryexit;
 371                         enum lttng_syscall_abi abi;
 372                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 373                         unsigned int syscall_id;
 374                 } syscall;
 375
 376         } u;
 377
 378         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 379         struct list_head enablers_ref_head;
 380         struct hlist_node hlist;        /* session ht of event_notifiers */
 381         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 382         struct list_head filter_bytecode_runtime_head;
 383         size_t num_captures;
 384         struct list_head capture_bytecode_runtime_head;
 385         int has_enablers_without_bytecode;
 386
 387         void (*send_notification)(struct lttng_event_notifier *event_notifier,
 388                         struct lttng_probe_ctx *lttng_probe_ctx,
 389                         const char *interpreter_stack_data);
 390         struct lttng_event_notifier_group *group; /* Weak ref */
 391 };
 392
 393 enum lttng_enabler_format_type {
 394         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 395         LTTNG_ENABLER_FORMAT_NAME,
 396 };
 397
 398 /*
 399  * Enabler field, within whatever object is enabling an event. Target of
 400  * backward reference.
 401  */
 402 struct lttng_enabler {
 403         enum lttng_event_type evtype;   /* First field. */
 404
 405         enum lttng_enabler_format_type format_type;
 406
 407         /* head list of struct lttng_bytecode_node */
 408         struct list_head filter_bytecode_head;
 409
 410         struct lttng_kernel_event event_param;
 411         unsigned int enabled:1;
 412
 413         uint64_t user_token;            /* User-provided token. */
 414 };
 415
 416 struct lttng_event_enabler {
 417         struct lttng_enabler base;
 418         struct list_head node;  /* per-session list of enablers */
 419         struct lttng_channel *chan;
 420         /*
 421          * Unused, but kept around to make it explicit that the tracer can do
 422          * it.
 423          */
 424         struct lttng_ctx *ctx;
 425 };
 426
 427 struct lttng_event_notifier_enabler {
 428         struct lttng_enabler base;
 429         struct list_head node;  /* List of event_notifier enablers */
 430         struct lttng_event_notifier_group *group;
 431
 432         /* head list of struct lttng_bytecode_node */
 433         struct list_head capture_bytecode_head;
 434         uint64_t num_captures;
 435 };
 436
 437
 438 static inline
 439 struct lttng_enabler *lttng_event_enabler_as_enabler(
 440                 struct lttng_event_enabler *event_enabler)
 441 {
 442         return &event_enabler->base;
 443 }
 444
 445 static inline
 446 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 447                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 448 {
 449         return &event_notifier_enabler->base;
 450 }
 451
 452 struct lttng_channel_ops {
 453         struct channel *(*channel_create)(const char *name,
 454                                 void *priv,
 455                                 void *buf_addr,
 456                                 size_t subbuf_size, size_t num_subbuf,
 457                                 unsigned int switch_timer_interval,
 458                                 unsigned int read_timer_interval);
 459         void (*channel_destroy)(struct channel *chan);
 460         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 461         int (*buffer_has_read_closed_stream)(struct channel *chan);
 462         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 463         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 464                              uint32_t event_id);
 465         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 466         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 467                             size_t len);
 468         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 469                                       const void *src, size_t len);
 470         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 471                              int c, size_t len);
 472         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 473                              size_t len);
 474         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 475                                        const char __user *src, size_t len);
 476         /*
 477          * packet_avail_size returns the available size in the current
 478          * packet. Note that the size returned is only a hint, since it
 479          * may change due to concurrent writes.
 480          */
 481         size_t (*packet_avail_size)(struct channel *chan);
 482         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 483         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 484         int (*is_finalized)(struct channel *chan);
 485         int (*is_disabled)(struct channel *chan);
 486         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 487                         struct lib_ring_buffer *bufb,
 488                         uint64_t *timestamp_begin);
 489         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 490                         struct lib_ring_buffer *bufb,
 491                         uint64_t *timestamp_end);
 492         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 493                         struct lib_ring_buffer *bufb,
 494                         uint64_t *events_discarded);
 495         int (*content_size) (const struct lib_ring_buffer_config *config,
 496                         struct lib_ring_buffer *bufb,
 497                         uint64_t *content_size);
 498         int (*packet_size) (const struct lib_ring_buffer_config *config,
 499                         struct lib_ring_buffer *bufb,
 500                         uint64_t *packet_size);
 501         int (*stream_id) (const struct lib_ring_buffer_config *config,
 502                         struct lib_ring_buffer *bufb,
 503                         uint64_t *stream_id);
 504         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 505                         struct lib_ring_buffer *bufb,
 506                         uint64_t *ts);
 507         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 508                         struct lib_ring_buffer *bufb,
 509                         uint64_t *seq);
 510         int (*instance_id) (const struct lib_ring_buffer_config *config,
 511                         struct lib_ring_buffer *bufb,
 512                         uint64_t *id);
 513 };
 514
 515 struct lttng_transport {
 516         char *name;
 517         struct module *owner;
 518         struct list_head node;
 519         struct lttng_channel_ops ops;
 520 };
 521
 522 struct lttng_syscall_filter;
 523
 524 #define LTTNG_EVENT_HT_BITS             12
 525 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 526
 527 struct lttng_event_ht {
 528         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 529 };
 530
 531 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 532 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 533
 534 struct lttng_event_notifier_ht {
 535         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 536 };
 537
 538 struct lttng_channel {
 539         unsigned int id;
 540         struct channel *chan;           /* Channel buffers */
 541         int enabled;
 542         struct lttng_ctx *ctx;
 543         /* Event ID management */
 544         struct lttng_session *session;
 545         struct file *file;              /* File associated to channel */
 546         unsigned int free_event_id;     /* Next event ID to allocate */
 547         struct list_head list;          /* Channel list */
 548         struct lttng_channel_ops *ops;
 549         struct lttng_transport *transport;
 550         struct lttng_event **sc_table;  /* for syscall tracing */
 551         struct lttng_event **compat_sc_table;
 552         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 553         struct lttng_event **compat_sc_exit_table;
 554         struct lttng_event *sc_unknown; /* for unknown syscalls */
 555         struct lttng_event *sc_compat_unknown;
 556         struct lttng_event *sc_exit_unknown;
 557         struct lttng_event *compat_sc_exit_unknown;
 558         struct lttng_syscall_filter *sc_filter;
 559         int header_type;                /* 0: unset, 1: compact, 2: large */
 560         enum channel_type channel_type;
 561         int syscall_all;
 562         unsigned int metadata_dumped:1,
 563                 sys_enter_registered:1,
 564                 sys_exit_registered:1,
 565                 tstate:1;               /* Transient enable state */
 566 };
 567
 568 struct lttng_metadata_stream {
 569         void *priv;                     /* Ring buffer private data */
 570         struct lttng_metadata_cache *metadata_cache;
 571         unsigned int metadata_in;       /* Bytes read from the cache */
 572         unsigned int metadata_out;      /* Bytes consumed from stream */
 573         int finalized;                  /* Has channel been finalized */
 574         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 575         struct list_head list;          /* Stream list */
 576         struct lttng_transport *transport;
 577         uint64_t version;               /* Current version of the metadata cache */
 578         bool coherent;                  /* Stream in a coherent state */
 579 };
 580
 581 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 582
 583 struct lttng_dynamic_len_stack {
 584         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 585         size_t offset;
 586 };
 587
 588 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 589
 590 /*
 591  * struct lttng_id_tracker declared in header due to deferencing of *v
 592  * in RCU_INITIALIZER(v).
 593  */
 594 #define LTTNG_ID_HASH_BITS      6
 595 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 596
 597 enum tracker_type {
 598         TRACKER_PID,
 599         TRACKER_VPID,
 600         TRACKER_UID,
 601         TRACKER_VUID,
 602         TRACKER_GID,
 603         TRACKER_VGID,
 604
 605         TRACKER_UNKNOWN,
 606 };
 607
 608 struct lttng_id_tracker_rcu {
 609         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 610 };
 611
 612 struct lttng_id_tracker {
 613         struct lttng_session *session;
 614         enum tracker_type tracker_type;
 615         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 616 };
 617
 618 struct lttng_id_hash_node {
 619         struct hlist_node hlist;
 620         int id;
 621 };
 622
 623 struct lttng_session {
 624         int active;                     /* Is trace session active ? */
 625         int been_active;                /* Has trace session been active ? */
 626         struct file *file;              /* File associated to session */
 627         struct list_head chan;          /* Channel list head */
 628         struct list_head events;        /* Event list head */
 629         struct list_head list;          /* Session list */
 630         unsigned int free_chan_id;      /* Next chan ID to allocate */
 631         uuid_le uuid;                   /* Trace session unique ID */
 632         struct lttng_metadata_cache *metadata_cache;
 633         struct lttng_id_tracker pid_tracker;
 634         struct lttng_id_tracker vpid_tracker;
 635         struct lttng_id_tracker uid_tracker;
 636         struct lttng_id_tracker vuid_tracker;
 637         struct lttng_id_tracker gid_tracker;
 638         struct lttng_id_tracker vgid_tracker;
 639         unsigned int metadata_dumped:1,
 640                 tstate:1;               /* Transient enable state */
 641         /* List of event enablers */
 642         struct list_head enablers_head;
 643         /* Hash table of events */
 644         struct lttng_event_ht events_ht;
 645         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 646         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 647 };
 648
 649 struct lttng_event_notifier_group {
 650         struct file *file;              /* File associated to event notifier group */
 651         struct file *notif_file;        /* File used to expose notifications to userspace. */
 652         struct list_head node;          /* event notifier group list */
 653         struct list_head enablers_head; /* List of enablers */
 654         struct list_head event_notifiers_head; /* List of event notifier */
 655         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 656         struct lttng_ctx *ctx;          /* Contexts for filters. */
 657         struct lttng_channel_ops *ops;
 658         struct lttng_transport *transport;
 659         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 660         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 661         wait_queue_head_t read_wait;
 662         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 663         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 664         struct lttng_event_notifier *sc_compat_unknown;
 665
 666         struct lttng_syscall_filter *sc_filter;
 667
 668         struct hlist_head *event_notifier_syscall_dispatch;
 669         struct hlist_head *event_notifier_compat_syscall_dispatch;
 670         struct hlist_head *event_notifier_exit_syscall_dispatch;
 671         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 672
 673         struct hlist_head event_notifier_unknown_syscall_dispatch;
 674         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 675         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 676         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 677
 678         int syscall_all_entry;
 679         int syscall_all_exit;
 680
 681         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 682
 683         struct lttng_counter *error_counter;
 684         size_t error_counter_len;
 685 };
 686
 687 struct lttng_metadata_cache {
 688         char *data;                     /* Metadata cache */
 689         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 690         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 691         atomic_t producing;             /* Metadata being produced (incomplete) */
 692         struct kref refcount;           /* Metadata cache usage */
 693         struct list_head metadata_stream;       /* Metadata stream list */
 694         uuid_le uuid;                   /* Trace session unique ID (copy) */
 695         struct mutex lock;              /* Produce/consume lock */
 696         uint64_t version;               /* Current version of the metadata */
 697 };
 698
 699 void lttng_lock_sessions(void);
 700 void lttng_unlock_sessions(void);
 701
 702 struct list_head *lttng_get_probe_list_head(void);
 703
 704 struct lttng_event_enabler *lttng_event_enabler_create(
 705                 enum lttng_enabler_format_type format_type,
 706                 struct lttng_kernel_event *event_param,
 707                 struct lttng_channel *chan);
 708
 709 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 710 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 711 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 712                 struct lttng_event_notifier_group *event_notifier_group,
 713                 enum lttng_enabler_format_type format_type,
 714                 struct lttng_kernel_event_notifier *event_notifier_param);
 715
 716 int lttng_event_notifier_enabler_enable(
 717                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 718 int lttng_event_notifier_enabler_disable(
 719                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 720 int lttng_fix_pending_events(void);
 721 int lttng_fix_pending_event_notifiers(void);
 722 int lttng_session_active(void);
 723 bool lttng_event_notifier_active(void);
 724
 725 struct lttng_session *lttng_session_create(void);
 726 int lttng_session_enable(struct lttng_session *session);
 727 int lttng_session_disable(struct lttng_session *session);
 728 void lttng_session_destroy(struct lttng_session *session);
 729 int lttng_session_metadata_regenerate(struct lttng_session *session);
 730 int lttng_session_statedump(struct lttng_session *session);
 731 void metadata_cache_destroy(struct kref *kref);
 732
 733 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 734 void lttng_event_notifier_group_destroy(
 735                 struct lttng_event_notifier_group *event_notifier_group);
 736
 737 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 738                                        const char *transport_name,
 739                                        void *buf_addr,
 740                                        size_t subbuf_size, size_t num_subbuf,
 741                                        unsigned int switch_timer_interval,
 742                                        unsigned int read_timer_interval,
 743                                        enum channel_type channel_type);
 744 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 745                                        int overwrite, void *buf_addr,
 746                                        size_t subbuf_size, size_t num_subbuf,
 747                                        unsigned int switch_timer_interval,
 748                                        unsigned int read_timer_interval);
 749
 750 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 751 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 752                                 struct lttng_kernel_event *event_param,
 753                                 void *filter,
 754                                 const struct lttng_event_desc *event_desc,
 755                                 enum lttng_kernel_instrumentation itype);
 756 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 757                                 struct lttng_kernel_event *event_param,
 758                                 void *filter,
 759                                 const struct lttng_event_desc *event_desc,
 760                                 enum lttng_kernel_instrumentation itype);
 761 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 762                 struct lttng_kernel_old_event *old_event_param,
 763                 void *filter,
 764                 const struct lttng_event_desc *internal_desc);
 765
 766 struct lttng_event_notifier *lttng_event_notifier_create(
 767                                 const struct lttng_event_desc *event_notifier_desc,
 768                                 uint64_t id,
 769                                 struct lttng_event_notifier_group *event_notifier_group,
 770                                 struct lttng_kernel_event_notifier *event_notifier_param,
 771                                 void *filter,
 772                                 enum lttng_kernel_instrumentation itype);
 773 struct lttng_event_notifier *_lttng_event_notifier_create(
 774                                 const struct lttng_event_desc *event_notifier_desc,
 775                                 uint64_t id,
 776                                 struct lttng_event_notifier_group *event_notifier_group,
 777                                 struct lttng_kernel_event_notifier *event_notifier_param,
 778                                 void *filter,
 779                                 enum lttng_kernel_instrumentation itype);
 780
 781 int lttng_channel_enable(struct lttng_channel *channel);
 782 int lttng_channel_disable(struct lttng_channel *channel);
 783 int lttng_event_enable(struct lttng_event *event);
 784 int lttng_event_disable(struct lttng_event *event);
 785
 786 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 787 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 788
 789 void lttng_transport_register(struct lttng_transport *transport);
 790 void lttng_transport_unregister(struct lttng_transport *transport);
 791
 792 void synchronize_trace(void);
 793 int lttng_abi_init(void);
 794 int lttng_abi_compat_old_init(void);
 795 void lttng_abi_exit(void);
 796 void lttng_abi_compat_old_exit(void);
 797
 798 int lttng_probe_register(struct lttng_probe_desc *desc);
 799 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 800 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 801 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 802 int lttng_probes_init(void);
 803 void lttng_probes_exit(void);
 804
 805 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 806                 struct channel *chan, bool *coherent);
 807
 808 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 809 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 810 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 811 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 812 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 813 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 814
 815 int lttng_session_track_id(struct lttng_session *session,
 816                 enum tracker_type tracker_type, int id);
 817 int lttng_session_untrack_id(struct lttng_session *session,
 818                 enum tracker_type tracker_type, int id);
 819
 820 int lttng_session_list_tracker_ids(struct lttng_session *session,
 821                 enum tracker_type tracker_type);
 822
 823 void lttng_clock_ref(void);
 824 void lttng_clock_unref(void);
 825
 826 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 827                 struct lttng_enabler *enabler);
 828
 829 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 830 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 831 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 832 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 833 int lttng_syscall_filter_enable_event(
 834                 struct lttng_channel *chan,
 835                 struct lttng_event *event);
 836 int lttng_syscall_filter_disable_event(
 837                 struct lttng_channel *chan,
 838                 struct lttng_event *event);
 839
 840 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 841                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 842
 843 int lttng_syscalls_register_event_notifier(
 844                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 845                 void *filter);
 846 int lttng_syscals_create_matching_event_notifiers(
 847                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 848 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 849 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 850 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 851 #else
 852 static inline int lttng_syscalls_register_event(
 853                 struct lttng_channel *chan, void *filter)
 854 {
 855         return -ENOSYS;
 856 }
 857
 858 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 859 {
 860         return 0;
 861 }
 862
 863 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 864 {
 865         return 0;
 866 }
 867
 868 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 869                 struct lttng_event *event);
 870 {
 871         return -ENOSYS;
 872 }
 873
 874 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 875                 struct lttng_event *event);
 876 {
 877         return -ENOSYS;
 878 }
 879
 880 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 881                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 882 {
 883         return -ENOSYS;
 884 }
 885
 886 static inline int lttng_syscalls_register_event_notifier(
 887                 struct lttng_event_notifier_group *group, void *filter)
 888 {
 889         return -ENOSYS;
 890 }
 891
 892 static inline int lttng_syscalls_unregister_event_notifier(
 893                 struct lttng_event_notifier_group *group)
 894 {
 895         return 0;
 896 }
 897
 898 static inline int lttng_syscall_filter_enable_event_notifier(
 899                 struct lttng_event_notifier_group *group,
 900                 const char *name)
 901 {
 902         return -ENOSYS;
 903 }
 904
 905 static inline int lttng_syscall_filter_disable_event_notifier(
 906                 struct lttng_event_notifier_group *group,
 907                 const char *name)
 908 {
 909         return -ENOSYS;
 910 }
 911
 912 #endif
 913
 914 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 915                 struct lttng_kernel_filter_bytecode __user *bytecode);
 916 int lttng_event_notifier_enabler_attach_filter_bytecode(
 917                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 918                 struct lttng_kernel_filter_bytecode __user *bytecode);
 919 int lttng_event_notifier_enabler_attach_capture_bytecode(
 920                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 921                 struct lttng_kernel_capture_bytecode __user *bytecode);
 922
 923 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 924                 struct lttng_ctx *ctx,
 925                 struct list_head *instance_bytecode_runtime_head,
 926                 struct list_head *enabler_bytecode_runtime_head);
 927
 928 int lttng_probes_init(void);
 929
 930 extern struct lttng_ctx *lttng_static_ctx;
 931
 932 int lttng_context_init(void);
 933 void lttng_context_exit(void);
 934 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 935 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 936 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 937                 size_t index);
 938 void lttng_context_update(struct lttng_ctx *ctx);
 939 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 940 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 941 void lttng_remove_context_field(struct lttng_ctx **ctx,
 942                                 struct lttng_ctx_field *field);
 943 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 944 void lttng_destroy_context(struct lttng_ctx *ctx);
 945 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 946 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 947 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 948 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 949 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 950 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 951 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 952 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 953 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 954 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 955 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 956 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 957 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 958 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 959 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 960 #else
 961 static inline
 962 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 963 {
 964         return -ENOSYS;
 965 }
 966 #endif
 967 #ifdef CONFIG_PREEMPT_RT_FULL
 968 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 969 #else
 970 static inline
 971 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 972 {
 973         return -ENOSYS;
 974 }
 975 #endif
 976
 977 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 978
 979 #if defined(CONFIG_CGROUPS) && \
 980         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 981          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 982 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 983 #else
 984 static inline
 985 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 986 {
 987         return -ENOSYS;
 988 }
 989 #endif
 990
 991 #if defined(CONFIG_IPC_NS) && \
 992         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 993 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 994 #else
 995 static inline
 996 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 997 {
 998         return -ENOSYS;
 999 }
1000 #endif
1001
1002 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
1003         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1004 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
1005 #else
1006 static inline
1007 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
1008 {
1009         return -ENOSYS;
1010 }
1011 #endif
1012
1013 #if defined(CONFIG_NET_NS) && \
1014         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1015 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
1016 #else
1017 static inline
1018 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
1019 {
1020         return -ENOSYS;
1021 }
1022 #endif
1023
1024 #if defined(CONFIG_PID_NS) && \
1025         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1026 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1027 #else
1028 static inline
1029 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1030 {
1031         return -ENOSYS;
1032 }
1033 #endif
1034
1035 #if defined(CONFIG_USER_NS) && \
1036         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1037 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1038 #else
1039 static inline
1040 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1041 {
1042         return -ENOSYS;
1043 }
1044 #endif
1045
1046 #if defined(CONFIG_UTS_NS) && \
1047         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1048 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1049 #else
1050 static inline
1051 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1052 {
1053         return -ENOSYS;
1054 }
1055 #endif
1056
1057 #if defined(CONFIG_TIME_NS) && \
1058         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1059 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1060 #else
1061 static inline
1062 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1063 {
1064         return -ENOSYS;
1065 }
1066 #endif
1067
1068 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1069 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1070 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1071 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1072 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1073 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1074 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1075 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1076 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1077 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1078 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1079 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1080
1081 #if defined(CONFIG_PERF_EVENTS)
1082 int lttng_add_perf_counter_to_ctx(uint32_t type,
1083                                   uint64_t config,
1084                                   const char *name,
1085                                   struct lttng_ctx **ctx);
1086 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1087                 struct lttng_cpuhp_node *node);
1088 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1089                 struct lttng_cpuhp_node *node);
1090 #else
1091 static inline
1092 int lttng_add_perf_counter_to_ctx(uint32_t type,
1093                                   uint64_t config,
1094                                   const char *name,
1095                                   struct lttng_ctx **ctx)
1096 {
1097         return -ENOSYS;
1098 }
1099 static inline
1100 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1101                 struct lttng_cpuhp_node *node)
1102 {
1103         return 0;
1104 }
1105 static inline
1106 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1107                 struct lttng_cpuhp_node *node)
1108 {
1109         return 0;
1110 }
1111 #endif
1112
1113 int lttng_logger_init(void);
1114 void lttng_logger_exit(void);
1115
1116 extern int lttng_statedump_start(struct lttng_session *session);
1117
1118 #ifdef CONFIG_KPROBES
1119 int lttng_kprobes_register_event(const char *name,
1120                 const char *symbol_name,
1121                 uint64_t offset,
1122                 uint64_t addr,
1123                 struct lttng_event *event);
1124 void lttng_kprobes_unregister_event(struct lttng_event *event);
1125 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1126 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1127                 uint64_t offset,
1128                 uint64_t addr,
1129                 struct lttng_event_notifier *event_notifier);
1130 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1131 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1132 #else
1133 static inline
1134 int lttng_kprobes_register_event(const char *name,
1135                 const char *symbol_name,
1136                 uint64_t offset,
1137                 uint64_t addr,
1138                 struct lttng_event *event)
1139 {
1140         return -ENOSYS;
1141 }
1142
1143 static inline
1144 void lttng_kprobes_unregister_event(struct lttng_event *event)
1145 {
1146 }
1147
1148 static inline
1149 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1150 {
1151 }
1152
1153 static inline
1154 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1155                 uint64_t offset,
1156                 uint64_t addr,
1157                 struct lttng_event_notifier *event_notifier)
1158 {
1159         return -ENOSYS;
1160 }
1161
1162 static inline
1163 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1164 {
1165 }
1166
1167 static inline
1168 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1169 {
1170 }
1171 #endif
1172
1173 int lttng_event_add_callsite(struct lttng_event *event,
1174         struct lttng_kernel_event_callsite *callsite);
1175
1176 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1177         struct lttng_kernel_event_callsite *callsite);
1178
1179 #ifdef CONFIG_UPROBES
1180 int lttng_uprobes_register_event(const char *name,
1181         int fd, struct lttng_event *event);
1182 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1183         struct lttng_kernel_event_callsite *callsite);
1184 void lttng_uprobes_unregister_event(struct lttng_event *event);
1185 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1186 int lttng_uprobes_register_event_notifier(const char *name,
1187         int fd, struct lttng_event_notifier *event_notifier);
1188 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1189         struct lttng_kernel_event_callsite *callsite);
1190 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1191 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1192 #else
1193 static inline
1194 int lttng_uprobes_register_event(const char *name,
1195         int fd, struct lttng_event *event)
1196 {
1197         return -ENOSYS;
1198 }
1199
1200 static inline
1201 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1202         struct lttng_kernel_event_callsite *callsite)
1203 {
1204         return -ENOSYS;
1205 }
1206
1207 static inline
1208 void lttng_uprobes_unregister_event(struct lttng_event *event)
1209 {
1210 }
1211
1212 static inline
1213 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1214 {
1215 }
1216
1217 static inline
1218 int lttng_uprobes_register_event_notifier(const char *name,
1219         int fd, struct lttng_event_notifier *event_notifier)
1220 {
1221         return -ENOSYS;
1222 }
1223
1224 static inline
1225 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1226         struct lttng_kernel_event_callsite *callsite)
1227 {
1228         return -ENOSYS;
1229 }
1230
1231 static inline
1232 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1233 {
1234 }
1235
1236 static inline
1237 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1238 {
1239 }
1240 #endif
1241
1242 #ifdef CONFIG_KRETPROBES
1243 int lttng_kretprobes_register(const char *name,
1244                 const char *symbol_name,
1245                 uint64_t offset,
1246                 uint64_t addr,
1247                 struct lttng_event *event_entry,
1248                 struct lttng_event *event_exit);
1249 void lttng_kretprobes_unregister(struct lttng_event *event);
1250 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1251 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1252         int enable);
1253 #else
1254 static inline
1255 int lttng_kretprobes_register(const char *name,
1256                 const char *symbol_name,
1257                 uint64_t offset,
1258                 uint64_t addr,
1259                 struct lttng_event *event_entry,
1260                 struct lttng_event *event_exit)
1261 {
1262         return -ENOSYS;
1263 }
1264
1265 static inline
1266 void lttng_kretprobes_unregister(struct lttng_event *event)
1267 {
1268 }
1269
1270 static inline
1271 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1272 {
1273 }
1274
1275 static inline
1276 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1277         int enable)
1278 {
1279         return -ENOSYS;
1280 }
1281 #endif
1282
1283 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1284
1285 extern const struct file_operations lttng_tracepoint_list_fops;
1286 extern const struct file_operations lttng_syscall_list_fops;
1287
1288 #define TRACEPOINT_HAS_DATA_ARG
1289
1290 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1291 {
1292         if (type->atype != atype_integer)
1293                 return false;
1294         switch (type->u.integer.size) {
1295         case 8:         /* Fall-through. */
1296         case 16:        /* Fall-through. */
1297         case 32:        /* Fall-through. */
1298         case 64:
1299                 break;
1300         default:
1301                 return false;
1302         }
1303         return true;
1304 }
1305
1306 #endif /* _LTTNG_EVENTS_H */