include/lttng/ust-events.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * Holds LTTng per-session event registry.
   7  */
   8
   9 #ifndef _LTTNG_UST_EVENTS_H
  10 #define _LTTNG_UST_EVENTS_H
  11
  12 #include <urcu/list.h>
  13 #include <urcu/hlist.h>
  14 #include <stddef.h>
  15 #include <stdint.h>
  16 #include <lttng/ust-config.h>
  17 #include <lttng/ust-abi.h>
  18 #include <lttng/ust-tracer.h>
  19 #include <lttng/ust-endian.h>
  20 #include <float.h>
  21 #include <errno.h>
  22 #include <urcu/ref.h>
  23 #include <pthread.h>
  24
  25 #ifndef LTTNG_PACKED
  26 #error "LTTNG_PACKED should be defined"
  27 #endif
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #define LTTNG_UST_UUID_LEN              16
  34
  35 /*
  36  * Tracepoint provider version. Compatibility based on the major number.
  37  * Older tracepoint providers can always register to newer lttng-ust
  38  * library, but the opposite is rejected: a newer tracepoint provider is
  39  * rejected by an older lttng-ust library.
  40  */
  41 #define LTTNG_UST_PROVIDER_MAJOR        2
  42 #define LTTNG_UST_PROVIDER_MINOR        0
  43
  44 struct lttng_channel;
  45 struct lttng_session;
  46 struct lttng_ust_lib_ring_buffer_ctx;
  47 struct lttng_ust_context_app;
  48 struct lttng_event_field;
  49 struct lttng_event_notifier;
  50 struct lttng_event_notifier_group;
  51
  52 /*
  53  * Data structures used by tracepoint event declarations, and by the
  54  * tracer. Those structures have padding for future extension.
  55  */
  56
  57 /*
  58  * LTTng client type enumeration. Used by the consumer to map the
  59  * callbacks from its own address space.
  60  */
  61 enum lttng_client_types {
  62         LTTNG_CLIENT_METADATA = 0,
  63         LTTNG_CLIENT_DISCARD = 1,
  64         LTTNG_CLIENT_OVERWRITE = 2,
  65         LTTNG_CLIENT_DISCARD_RT = 3,
  66         LTTNG_CLIENT_OVERWRITE_RT = 4,
  67         LTTNG_NR_CLIENT_TYPES,
  68 };
  69
  70 /* Type description */
  71
  72 /* Update the astract_types name table in lttng-types.c along with this enum */
  73 enum lttng_abstract_types {
  74         atype_integer,
  75         atype_enum,     /* legacy */
  76         atype_array,    /* legacy */
  77         atype_sequence, /* legacy */
  78         atype_string,
  79         atype_float,
  80         atype_dynamic,
  81         atype_struct,   /* legacy */
  82         atype_enum_nestable,
  83         atype_array_nestable,
  84         atype_sequence_nestable,
  85         atype_struct_nestable,
  86         NR_ABSTRACT_TYPES,
  87 };
  88
  89 /* Update the string_encodings name table in lttng-types.c along with this enum */
  90 enum lttng_string_encodings {
  91         lttng_encode_none = 0,
  92         lttng_encode_UTF8 = 1,
  93         lttng_encode_ASCII = 2,
  94         NR_STRING_ENCODINGS,
  95 };
  96
  97 struct lttng_enum_value {
  98         unsigned long long value;
  99         unsigned int signedness:1;
 100 };
 101
 102 enum lttng_enum_entry_options {
 103         LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
 104 };
 105
 106 #define LTTNG_UST_ENUM_ENTRY_PADDING    16
 107 struct lttng_enum_entry {
 108         struct lttng_enum_value start, end; /* start and end are inclusive */
 109         const char *string;
 110         union {
 111                 struct {
 112                         unsigned int options;
 113                 } LTTNG_PACKED extra;
 114                 char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
 115         } u;
 116 };
 117
 118 #define __type_integer(_type, _byte_order, _base, _encoding)    \
 119         {                                                       \
 120           .atype = atype_integer,                               \
 121           .u =                                                  \
 122                 {                                               \
 123                   .integer =                                    \
 124                         {                                       \
 125                           .size = sizeof(_type) * CHAR_BIT,     \
 126                           .alignment = lttng_alignof(_type) * CHAR_BIT, \
 127                           .signedness = lttng_is_signed_type(_type), \
 128                           .reverse_byte_order = _byte_order != BYTE_ORDER, \
 129                           .base = _base,                        \
 130                           .encoding = lttng_encode_##_encoding, \
 131                         }                                       \
 132                 },                                              \
 133         }                                                       \
 134
 135 #define LTTNG_UST_INTEGER_TYPE_PADDING  24
 136 struct lttng_integer_type {
 137         unsigned int size;              /* in bits */
 138         unsigned short alignment;       /* in bits */
 139         unsigned int signedness:1;
 140         unsigned int reverse_byte_order:1;
 141         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 142         enum lttng_string_encodings encoding;
 143         char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
 144 };
 145
 146 /*
 147  * Only float and double are supported. long double is not supported at
 148  * the moment.
 149  */
 150 #define _float_mant_dig(_type)                                          \
 151         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
 152                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
 153                 : 0))
 154
 155 #define __type_float(_type)                                     \
 156         {                                                       \
 157           .atype = atype_float,                                 \
 158           .u =                                                  \
 159                 {                                               \
 160                   ._float =                                     \
 161                         {                                       \
 162                           .exp_dig = sizeof(_type) * CHAR_BIT   \
 163                                           - _float_mant_dig(_type), \
 164                           .mant_dig = _float_mant_dig(_type),   \
 165                           .alignment = lttng_alignof(_type) * CHAR_BIT, \
 166                           .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
 167                         }                                       \
 168                 }                                               \
 169         }                                                       \
 170
 171 #define LTTNG_UST_FLOAT_TYPE_PADDING    24
 172 struct lttng_float_type {
 173         unsigned int exp_dig;           /* exponent digits, in bits */
 174         unsigned int mant_dig;          /* mantissa digits, in bits */
 175         unsigned short alignment;       /* in bits */
 176         unsigned int reverse_byte_order:1;
 177         char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
 178 };
 179
 180 /* legacy */
 181 #define LTTNG_UST_BASIC_TYPE_PADDING    128
 182 union _lttng_basic_type {
 183         struct lttng_integer_type integer;      /* legacy */
 184         struct {
 185                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 186                 struct lttng_integer_type container_type;
 187         } enumeration;                          /* legacy */
 188         struct {
 189                 enum lttng_string_encodings encoding;
 190         } string;                               /* legacy */
 191         struct lttng_float_type _float;         /* legacy */
 192         char padding[LTTNG_UST_BASIC_TYPE_PADDING];
 193 };
 194
 195 /* legacy */
 196 struct lttng_basic_type {
 197         enum lttng_abstract_types atype;
 198         union {
 199                 union _lttng_basic_type basic;
 200         } u;
 201 };
 202
 203 #define LTTNG_UST_TYPE_PADDING  128
 204 struct lttng_type {
 205         enum lttng_abstract_types atype;
 206         union {
 207                 /* provider ABI 2.0 */
 208                 struct lttng_integer_type integer;
 209                 struct lttng_float_type _float;
 210                 struct {
 211                         enum lttng_string_encodings encoding;
 212                 } string;
 213                 struct {
 214                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 215                         struct lttng_type *container_type;
 216                 } enum_nestable;
 217                 struct {
 218                         const struct lttng_type *elem_type;
 219                         unsigned int length;                    /* Num. elems. */
 220                         unsigned int alignment;
 221                 } array_nestable;
 222                 struct {
 223                         const char *length_name;                /* Length field name. */
 224                         const struct lttng_type *elem_type;
 225                         unsigned int alignment;                 /* Alignment before elements. */
 226                 } sequence_nestable;
 227                 struct {
 228                         unsigned int nr_fields;
 229                         const struct lttng_event_field *fields; /* Array of fields. */
 230                         unsigned int alignment;
 231                 } struct_nestable;
 232
 233                 union {
 234                         /* legacy provider ABI 1.0 */
 235                         union _lttng_basic_type basic;  /* legacy */
 236                         struct {
 237                                 struct lttng_basic_type elem_type;
 238                                 unsigned int length;            /* Num. elems. */
 239                         } array;                        /* legacy */
 240                         struct {
 241                                 struct lttng_basic_type length_type;
 242                                 struct lttng_basic_type elem_type;
 243                         } sequence;                     /* legacy */
 244                         struct {
 245                                 unsigned int nr_fields;
 246                                 struct lttng_event_field *fields;       /* Array of fields. */
 247                         } _struct;                      /* legacy */
 248                 } legacy;
 249                 char padding[LTTNG_UST_TYPE_PADDING];
 250         } u;
 251 };
 252
 253 #define LTTNG_UST_ENUM_TYPE_PADDING     24
 254 struct lttng_enum_desc {
 255         const char *name;
 256         const struct lttng_enum_entry *entries;
 257         unsigned int nr_entries;
 258         char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 259 };
 260
 261 /*
 262  * Event field description
 263  *
 264  * IMPORTANT: this structure is part of the ABI between the probe and
 265  * UST. Fields need to be only added at the end, never reordered, never
 266  * removed.
 267  */
 268
 269 #define LTTNG_UST_EVENT_FIELD_PADDING   28
 270 struct lttng_event_field {
 271         const char *name;
 272         struct lttng_type type;
 273         unsigned int nowrite;   /* do not write into trace */
 274         union {
 275                 struct {
 276                         unsigned int nofilter:1;        /* do not consider for filter */
 277                 } ext;
 278                 char padding[LTTNG_UST_EVENT_FIELD_PADDING];
 279         } u;
 280 };
 281
 282 enum lttng_ust_dynamic_type {
 283         LTTNG_UST_DYNAMIC_TYPE_NONE,
 284         LTTNG_UST_DYNAMIC_TYPE_S8,
 285         LTTNG_UST_DYNAMIC_TYPE_S16,
 286         LTTNG_UST_DYNAMIC_TYPE_S32,
 287         LTTNG_UST_DYNAMIC_TYPE_S64,
 288         LTTNG_UST_DYNAMIC_TYPE_U8,
 289         LTTNG_UST_DYNAMIC_TYPE_U16,
 290         LTTNG_UST_DYNAMIC_TYPE_U32,
 291         LTTNG_UST_DYNAMIC_TYPE_U64,
 292         LTTNG_UST_DYNAMIC_TYPE_FLOAT,
 293         LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
 294         LTTNG_UST_DYNAMIC_TYPE_STRING,
 295         _NR_LTTNG_UST_DYNAMIC_TYPES,
 296 };
 297
 298 struct lttng_ctx_value {
 299         enum lttng_ust_dynamic_type sel;
 300         union {
 301                 int64_t s64;
 302                 uint64_t u64;
 303                 const char *str;
 304                 double d;
 305         } u;
 306 };
 307
 308 struct lttng_perf_counter_field;
 309
 310 #define LTTNG_UST_CTX_FIELD_PADDING     40
 311 struct lttng_ctx_field {
 312         struct lttng_event_field event_field;
 313         size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
 314         void (*record)(struct lttng_ctx_field *field,
 315                        struct lttng_ust_lib_ring_buffer_ctx *ctx,
 316                        struct lttng_channel *chan);
 317         void (*get_value)(struct lttng_ctx_field *field,
 318                          struct lttng_ctx_value *value);
 319         union {
 320                 struct lttng_perf_counter_field *perf_counter;
 321                 char padding[LTTNG_UST_CTX_FIELD_PADDING];
 322         } u;
 323         void (*destroy)(struct lttng_ctx_field *field);
 324         char *field_name;       /* Has ownership, dynamically allocated. */
 325 };
 326
 327 #define LTTNG_UST_CTX_PADDING   20
 328 struct lttng_ctx {
 329         struct lttng_ctx_field *fields;
 330         unsigned int nr_fields;
 331         unsigned int allocated_fields;
 332         unsigned int largest_align;
 333         char padding[LTTNG_UST_CTX_PADDING];
 334 };
 335
 336 #define LTTNG_UST_EVENT_DESC_PADDING    40
 337 struct lttng_event_desc {
 338         const char *name;
 339         void (*probe_callback)(void);
 340         const struct lttng_event_ctx *ctx;      /* context */
 341         const struct lttng_event_field *fields; /* event payload */
 342         unsigned int nr_fields;
 343         const int **loglevel;
 344         const char *signature;  /* Argument types/names received */
 345         union {
 346                 struct {
 347                         const char **model_emf_uri;
 348                         void (*event_notifier_callback)(void);
 349                 } ext;
 350                 char padding[LTTNG_UST_EVENT_DESC_PADDING];
 351         } u;
 352 };
 353
 354 #define LTTNG_UST_PROBE_DESC_PADDING    12
 355 struct lttng_probe_desc {
 356         const char *provider;
 357         const struct lttng_event_desc **event_desc;
 358         unsigned int nr_events;
 359         struct cds_list_head head;              /* chain registered probes */
 360         struct cds_list_head lazy_init_head;
 361         int lazy;                               /* lazy registration */
 362         uint32_t major;
 363         uint32_t minor;
 364         char padding[LTTNG_UST_PROBE_DESC_PADDING];
 365 };
 366
 367 /* Data structures used by the tracer. */
 368
 369 enum lttng_enabler_format_type {
 370         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 371         LTTNG_ENABLER_FORMAT_EVENT,
 372 };
 373
 374 /*
 375  * Enabler field, within whatever object is enabling an event. Target of
 376  * backward reference.
 377  */
 378 struct lttng_enabler {
 379         enum lttng_enabler_format_type format_type;
 380
 381         /* head list of struct lttng_ust_filter_bytecode_node */
 382         struct cds_list_head filter_bytecode_head;
 383         /* head list of struct lttng_ust_excluder_node */
 384         struct cds_list_head excluder_head;
 385
 386         struct lttng_ust_event event_param;
 387         unsigned int enabled:1;
 388 };
 389
 390 struct tp_list_entry {
 391         struct lttng_ust_tracepoint_iter tp;
 392         struct cds_list_head head;
 393 };
 394
 395 struct lttng_ust_tracepoint_list {
 396         struct tp_list_entry *iter;
 397         struct cds_list_head head;
 398 };
 399
 400 struct tp_field_list_entry {
 401         struct lttng_ust_field_iter field;
 402         struct cds_list_head head;
 403 };
 404
 405 struct lttng_ust_field_list {
 406         struct tp_field_list_entry *iter;
 407         struct cds_list_head head;
 408 };
 409
 410 struct ust_pending_probe;
 411 struct lttng_event;
 412
 413 /*
 414  * Bytecode interpreter return value masks.
 415  */
 416 enum lttng_bytecode_interpreter_ret {
 417         LTTNG_INTERPRETER_DISCARD = 0,
 418         LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
 419         /* Other bits are kept for future use. */
 420 };
 421
 422 struct lttng_interpreter_output;
 423
 424 /*
 425  * This structure is used in the probes. More specifically, the `filter` and
 426  * `node` fields are explicity used in the probes. When modifying this
 427  * structure we must not change the layout of these two fields as it is
 428  * considered ABI.
 429  */
 430 struct lttng_bytecode_runtime {
 431         /* Associated bytecode */
 432         struct lttng_ust_bytecode_node *bc;
 433         union {
 434                 uint64_t (*filter)(void *interpreter_data,
 435                                 const char *interpreter_stack_data);
 436                 uint64_t (*capture)(void *interpreter_data,
 437                                 const char *interpreter_stack_data,
 438                                 struct lttng_interpreter_output *interpreter_output);
 439         } interpreter_funcs;
 440         int link_failed;
 441         struct cds_list_head node;      /* list of bytecode runtime in event */
 442         /*
 443          * Pointer to a URCU-protected pointer owned by an `struct
 444          * lttng_session`or `struct lttng_event_notifier_group`.
 445          */
 446         struct lttng_ctx **pctx;
 447 };
 448
 449 /*
 450  * Objects in a linked-list of enablers, owned by an event or event_notifier.
 451  * This is used because an event (or a event_notifier) can be enabled by more
 452  * than one enabler and we want a quick way to iterate over all enablers of an
 453  * object.
 454  *
 455  * For example, event rules "my_app:a*" and "my_app:ab*" will both match the
 456  * event with the name "my_app:abc".
 457  */
 458 struct lttng_enabler_ref {
 459         struct cds_list_head node;              /* enabler ref list */
 460         struct lttng_enabler *ref;              /* backward ref */
 461 };
 462
 463 /*
 464  * lttng_event structure is referred to by the tracing fast path. It
 465  * must be kept small.
 466  *
 467  * IMPORTANT: this structure is part of the ABI between the probe and
 468  * UST. Fields need to be only added at the end, never reordered, never
 469  * removed.
 470  */
 471 struct lttng_event {
 472         unsigned int id;
 473         struct lttng_channel *chan;
 474         int enabled;
 475         const struct lttng_event_desc *desc;
 476         struct lttng_ctx *ctx;
 477         enum lttng_ust_instrumentation instrumentation;
 478         struct cds_list_head node;              /* Event list in session */
 479
 480         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 481         struct cds_list_head filter_bytecode_runtime_head;
 482         int has_enablers_without_bytecode;
 483         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 484         struct cds_list_head enablers_ref_head;
 485         struct cds_hlist_node hlist;    /* session ht of events */
 486         int registered;                 /* has reg'd tracepoint probe */
 487 };
 488
 489 struct lttng_event_notifier {
 490         uint64_t user_token;
 491         uint64_t error_counter_index;
 492         int enabled;
 493         int registered;                 /* has reg'd tracepoint probe */
 494         size_t num_captures;            /* Needed to allocate the msgpack array. */
 495         void (*notification_send)(struct lttng_event_notifier *event_notifier,
 496                 const char *stack_data);
 497         struct cds_list_head filter_bytecode_runtime_head;
 498         struct cds_list_head capture_bytecode_runtime_head;
 499         int has_enablers_without_bytecode;
 500         struct cds_list_head enablers_ref_head;
 501         const struct lttng_event_desc *desc;
 502         struct cds_hlist_node hlist;    /* hashtable of event_notifiers */
 503         struct cds_list_head node;      /* event_notifier list in session */
 504         struct lttng_event_notifier_group *group; /* weak ref */
 505 };
 506
 507 struct lttng_enum {
 508         const struct lttng_enum_desc *desc;
 509         struct lttng_session *session;
 510         struct cds_list_head node;      /* Enum list in session */
 511         struct cds_hlist_node hlist;    /* Session ht of enums */
 512         uint64_t id;                    /* Enumeration ID in sessiond */
 513 };
 514
 515 struct channel;
 516 struct lttng_ust_shm_handle;
 517
 518 /*
 519  * IMPORTANT: this structure is part of the ABI between the probe and
 520  * UST. Fields need to be only added at the end, never reordered, never
 521  * removed.
 522  */
 523 struct lttng_channel_ops {
 524         struct lttng_channel *(*channel_create)(const char *name,
 525                         void *buf_addr,
 526                         size_t subbuf_size, size_t num_subbuf,
 527                         unsigned int switch_timer_interval,
 528                         unsigned int read_timer_interval,
 529                         unsigned char *uuid,
 530                         uint32_t chan_id,
 531                         const int *stream_fds, int nr_stream_fds,
 532                         int64_t blocking_timeout);
 533         void (*channel_destroy)(struct lttng_channel *chan);
 534         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 535                              uint32_t event_id);
 536         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 537         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 538                         const void *src, size_t len);
 539         /*
 540          * packet_avail_size returns the available size in the current
 541          * packet. Note that the size returned is only a hint, since it
 542          * may change due to concurrent writes.
 543          */
 544         size_t (*packet_avail_size)(struct channel *chan,
 545                                     struct lttng_ust_shm_handle *handle);
 546         int (*is_finalized)(struct channel *chan);
 547         int (*is_disabled)(struct channel *chan);
 548         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 549         void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 550                         const char *src, size_t len);
 551 };
 552
 553 /*
 554  * IMPORTANT: this structure is part of the ABI between the probe and
 555  * UST. Fields need to be only added at the end, never reordered, never
 556  * removed.
 557  */
 558 struct lttng_channel {
 559         /*
 560          * The pointers located in this private data are NOT safe to be
 561          * dereferenced by the consumer. The only operations the
 562          * consumer process is designed to be allowed to do is to read
 563          * and perform subbuffer flush.
 564          */
 565         struct channel *chan;           /* Channel buffers */
 566         int enabled;
 567         struct lttng_ctx *ctx;
 568         /* Event ID management */
 569         struct lttng_session *session;
 570         int objd;                       /* Object associated to channel */
 571         struct cds_list_head node;      /* Channel list in session */
 572         const struct lttng_channel_ops *ops;
 573         int header_type;                /* 0: unset, 1: compact, 2: large */
 574         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 575
 576         /* Channel ID */
 577         unsigned int id;
 578         enum lttng_ust_chan_type type;
 579         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 580         int tstate:1;                   /* Transient enable state */
 581 };
 582
 583 #define LTTNG_COUNTER_DIMENSION_MAX     8
 584
 585 struct lttng_counter_dimension {
 586         uint64_t size;
 587         uint64_t underflow_index;
 588         uint64_t overflow_index;
 589         uint8_t has_underflow;
 590         uint8_t has_overflow;
 591 };
 592
 593 struct lttng_counter_ops {
 594         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 595                         const struct lttng_counter_dimension *dimensions,
 596                         int64_t global_sum_step,
 597                         int global_counter_fd,
 598                         int nr_counter_cpu_fds,
 599                         const int *counter_cpu_fds,
 600                         bool is_daemon);
 601         void (*counter_destroy)(struct lib_counter *counter);
 602         int (*counter_add)(struct lib_counter *counter,
 603                         const size_t *dimension_indexes, int64_t v);
 604         int (*counter_read)(struct lib_counter *counter,
 605                         const size_t *dimension_indexes, int cpu,
 606                         int64_t *value, bool *overflow, bool *underflow);
 607         int (*counter_aggregate)(struct lib_counter *counter,
 608                         const size_t *dimension_indexes, int64_t *value,
 609                         bool *overflow, bool *underflow);
 610         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 611 };
 612
 613 #define LTTNG_UST_STACK_CTX_PADDING     32
 614 struct lttng_stack_ctx {
 615         struct lttng_event *event;
 616         struct lttng_ctx *chan_ctx;     /* RCU dereferenced. */
 617         struct lttng_ctx *event_ctx;    /* RCU dereferenced. */
 618         char padding[LTTNG_UST_STACK_CTX_PADDING];
 619 };
 620
 621 #define LTTNG_UST_EVENT_HT_BITS         12
 622 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 623
 624 struct lttng_ust_event_ht {
 625         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 626 };
 627
 628 #define LTTNG_UST_EVENT_NOTIFIER_HT_BITS                12
 629 #define LTTNG_UST_EVENT_NOTIFIER_HT_SIZE                (1U << LTTNG_UST_EVENT_NOTIFIER_HT_BITS)
 630 struct lttng_ust_event_notifier_ht {
 631         struct cds_hlist_head table[LTTNG_UST_EVENT_NOTIFIER_HT_SIZE];
 632 };
 633
 634 #define LTTNG_UST_ENUM_HT_BITS          12
 635 #define LTTNG_UST_ENUM_HT_SIZE          (1U << LTTNG_UST_ENUM_HT_BITS)
 636
 637 struct lttng_ust_enum_ht {
 638         struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
 639 };
 640
 641 /*
 642  * IMPORTANT: this structure is part of the ABI between the probe and
 643  * UST. Fields need to be only added at the end, never reordered, never
 644  * removed.
 645  */
 646 struct lttng_session {
 647         int active;                             /* Is trace session active ? */
 648         int been_active;                        /* Been active ? */
 649         int objd;                               /* Object associated */
 650         struct cds_list_head chan_head;         /* Channel list head */
 651         struct cds_list_head events_head;       /* list of events */
 652         struct cds_list_head node;              /* Session list */
 653
 654         /* New UST 2.1 */
 655         /* List of enablers */
 656         struct cds_list_head enablers_head;
 657         struct lttng_ust_event_ht events_ht;    /* ht of events */
 658         void *owner;                            /* object owner */
 659         int tstate:1;                           /* Transient enable state */
 660
 661         /* New UST 2.4 */
 662         int statedump_pending:1;
 663
 664         /* New UST 2.8 */
 665         struct lttng_ust_enum_ht enums_ht;      /* ht of enumerations */
 666         struct cds_list_head enums_head;
 667         struct lttng_ctx *ctx;                  /* contexts for filters. */
 668 };
 669
 670 struct lttng_counter {
 671         int objd;
 672         struct lttng_event_notifier_group *event_notifier_group;    /* owner */
 673         struct lttng_counter_transport *transport;
 674         struct lib_counter *counter;
 675         struct lttng_counter_ops *ops;
 676 };
 677
 678 struct lttng_event_notifier_group {
 679         int objd;
 680         void *owner;
 681         int notification_fd;
 682         struct cds_list_head node;              /* Event notifier group handle list */
 683         struct cds_list_head enablers_head;
 684         struct cds_list_head event_notifiers_head;      /* list of event_notifiers */
 685         struct lttng_ust_event_notifier_ht event_notifiers_ht; /* hashtable of event_notifiers */
 686         struct lttng_ctx *ctx;                  /* contexts for filters. */
 687
 688         struct lttng_counter *error_counter;
 689         size_t error_counter_len;
 690 };
 691
 692 struct lttng_transport {
 693         char *name;
 694         struct cds_list_head node;
 695         struct lttng_channel_ops ops;
 696         const struct lttng_ust_lib_ring_buffer_config *client_config;
 697 };
 698
 699 struct lttng_counter_transport {
 700         char *name;
 701         struct cds_list_head node;
 702         struct lttng_counter_ops ops;
 703         const struct lib_counter_config *client_config;
 704 };
 705
 706 struct lttng_session *lttng_session_create(void);
 707 int lttng_session_enable(struct lttng_session *session);
 708 int lttng_session_disable(struct lttng_session *session);
 709 int lttng_session_statedump(struct lttng_session *session);
 710 void lttng_session_destroy(struct lttng_session *session);
 711
 712 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 713                                        const char *transport_name,
 714                                        void *buf_addr,
 715                                        size_t subbuf_size, size_t num_subbuf,
 716                                        unsigned int switch_timer_interval,
 717                                        unsigned int read_timer_interval,
 718                                        int **shm_fd, int **wait_fd,
 719                                        uint64_t **memory_map_size,
 720                                        struct lttng_channel *chan_priv_init);
 721
 722 int lttng_channel_enable(struct lttng_channel *channel);
 723 int lttng_channel_disable(struct lttng_channel *channel);
 724
 725 int lttng_attach_context(struct lttng_ust_context *context_param,
 726                 union ust_args *uargs,
 727                 struct lttng_ctx **ctx, struct lttng_session *session);
 728 void lttng_transport_register(struct lttng_transport *transport);
 729 void lttng_transport_unregister(struct lttng_transport *transport);
 730
 731 int lttng_probe_register(struct lttng_probe_desc *desc);
 732 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 733 void lttng_probe_provider_unregister_events(struct lttng_probe_desc *desc);
 734 int lttng_fix_pending_events(void);
 735 int lttng_probes_init(void);
 736 void lttng_probes_exit(void);
 737 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 738 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 739 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 740 void lttng_context_update(struct lttng_ctx *ctx);
 741 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 742                                 struct lttng_ctx_field *field);
 743 void lttng_destroy_context(struct lttng_ctx *ctx);
 744 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 745 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 746 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 747 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 748 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 749 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 750 int lttng_add_dyntest_to_ctx(struct lttng_ctx **ctx);
 751 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 752 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 753 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 754 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 755 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 756 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 757 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 758 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
 759 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
 760 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
 761 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
 762 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
 763 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
 764 void lttng_context_vtid_reset(void);
 765 void lttng_context_vpid_reset(void);
 766 void lttng_context_procname_reset(void);
 767 void lttng_context_cgroup_ns_reset(void);
 768 void lttng_context_ipc_ns_reset(void);
 769 void lttng_context_mnt_ns_reset(void);
 770 void lttng_context_net_ns_reset(void);
 771 void lttng_context_pid_ns_reset(void);
 772 void lttng_context_user_ns_reset(void);
 773 void lttng_context_uts_ns_reset(void);
 774 void lttng_context_vuid_reset(void);
 775 void lttng_context_veuid_reset(void);
 776 void lttng_context_vsuid_reset(void);
 777 void lttng_context_vgid_reset(void);
 778 void lttng_context_vegid_reset(void);
 779 void lttng_context_vsgid_reset(void);
 780
 781 #ifdef LTTNG_UST_HAVE_PERF_EVENT
 782 int lttng_add_perf_counter_to_ctx(uint32_t type,
 783                                   uint64_t config,
 784                                   const char *name,
 785                                   struct lttng_ctx **ctx);
 786 int lttng_perf_counter_init(void);
 787 void lttng_perf_counter_exit(void);
 788 #else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 789 static inline
 790 int lttng_add_perf_counter_to_ctx(uint32_t type,
 791                                   uint64_t config,
 792                                   const char *name,
 793                                   struct lttng_ctx **ctx)
 794 {
 795         return -ENOSYS;
 796 }
 797 static inline
 798 int lttng_perf_counter_init(void)
 799 {
 800         return 0;
 801 }
 802 static inline
 803 void lttng_perf_counter_exit(void)
 804 {
 805 }
 806 #endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 807
 808 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 809 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 810 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 811
 812 struct lttng_transport *lttng_transport_find(const char *name);
 813
 814 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 815 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 816 struct lttng_ust_tracepoint_iter *
 817         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 818 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 819 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 820 struct lttng_ust_field_iter *
 821         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 822
 823 void lttng_free_event_filter_runtime(struct lttng_event *event);
 824
 825 struct cds_list_head *lttng_get_probe_list_head(void);
 826 int lttng_session_active(void);
 827
 828 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 829 void lttng_handle_pending_statedump(void *owner);
 830 struct cds_list_head *_lttng_get_sessions(void);
 831
 832 struct lttng_enum *lttng_ust_enum_get_from_desc(struct lttng_session *session,
 833                 const struct lttng_enum_desc *enum_desc);
 834
 835 void lttng_ust_dl_update(void *ip);
 836 void lttng_ust_fixup_fd_tracker_tls(void);
 837
 838 #ifdef __cplusplus
 839 }
 840 #endif
 841
 842 #endif /* _LTTNG_UST_EVENTS_H */