include/lttng/ust-events.h

   1 #ifndef _LTTNG_UST_EVENTS_H
   2 #define _LTTNG_UST_EVENTS_H
   3
   4 /*
   5  * lttng/ust-events.h
   6  *
   7  * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Holds LTTng per-session event registry.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <urcu/list.h>
  31 #include <urcu/hlist.h>
  32 #include <stddef.h>
  33 #include <stdint.h>
  34 #include <lttng/ust-config.h>
  35 #include <lttng/ust-abi.h>
  36 #include <lttng/ust-tracer.h>
  37 #include <lttng/ust-endian.h>
  38 #include <float.h>
  39 #include <errno.h>
  40 #include <urcu/ref.h>
  41 #include <pthread.h>
  42
  43 #ifndef LTTNG_PACKED
  44 #error "LTTNG_PACKED should be defined"
  45 #endif
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51 #define LTTNG_UST_UUID_LEN              16
  52
  53 /*
  54  * Tracepoint provider version. Compatibility based on the major number.
  55  * Older tracepoint providers can always register to newer lttng-ust
  56  * library, but the opposite is rejected: a newer tracepoint provider is
  57  * rejected by an older lttng-ust library.
  58  */
  59 #define LTTNG_UST_PROVIDER_MAJOR        2
  60 #define LTTNG_UST_PROVIDER_MINOR        0
  61
  62 struct lttng_channel;
  63 struct lttng_session;
  64 struct lttng_ust_lib_ring_buffer_ctx;
  65 struct lttng_ust_context_app;
  66 struct lttng_event_field;
  67 struct lttng_event_notifier;
  68 struct lttng_event_notifier_group;
  69
  70 /*
  71  * Data structures used by tracepoint event declarations, and by the
  72  * tracer. Those structures have padding for future extension.
  73  */
  74
  75 /*
  76  * LTTng client type enumeration. Used by the consumer to map the
  77  * callbacks from its own address space.
  78  */
  79 enum lttng_client_types {
  80         LTTNG_CLIENT_METADATA = 0,
  81         LTTNG_CLIENT_DISCARD = 1,
  82         LTTNG_CLIENT_OVERWRITE = 2,
  83         LTTNG_CLIENT_DISCARD_RT = 3,
  84         LTTNG_CLIENT_OVERWRITE_RT = 4,
  85         LTTNG_NR_CLIENT_TYPES,
  86 };
  87
  88 /* Type description */
  89
  90 /* Update the astract_types name table in lttng-types.c along with this enum */
  91 enum lttng_abstract_types {
  92         atype_integer,
  93         atype_enum,     /* legacy */
  94         atype_array,    /* legacy */
  95         atype_sequence, /* legacy */
  96         atype_string,
  97         atype_float,
  98         atype_dynamic,
  99         atype_struct,   /* legacy */
 100         atype_enum_nestable,
 101         atype_array_nestable,
 102         atype_sequence_nestable,
 103         atype_struct_nestable,
 104         NR_ABSTRACT_TYPES,
 105 };
 106
 107 /* Update the string_encodings name table in lttng-types.c along with this enum */
 108 enum lttng_string_encodings {
 109         lttng_encode_none = 0,
 110         lttng_encode_UTF8 = 1,
 111         lttng_encode_ASCII = 2,
 112         NR_STRING_ENCODINGS,
 113 };
 114
 115 struct lttng_enum_value {
 116         unsigned long long value;
 117         unsigned int signedness:1;
 118 };
 119
 120 enum lttng_enum_entry_options {
 121         LTTNG_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
 122 };
 123
 124 #define LTTNG_UST_ENUM_ENTRY_PADDING    16
 125 struct lttng_enum_entry {
 126         struct lttng_enum_value start, end; /* start and end are inclusive */
 127         const char *string;
 128         union {
 129                 struct {
 130                         unsigned int options;
 131                 } LTTNG_PACKED extra;
 132                 char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
 133         } u;
 134 };
 135
 136 #define __type_integer(_type, _byte_order, _base, _encoding)    \
 137         {                                                       \
 138           .atype = atype_integer,                               \
 139           .u =                                                  \
 140                 {                                               \
 141                   .integer =                                    \
 142                         {                                       \
 143                           .size = sizeof(_type) * CHAR_BIT,     \
 144                           .alignment = lttng_alignof(_type) * CHAR_BIT, \
 145                           .signedness = lttng_is_signed_type(_type), \
 146                           .reverse_byte_order = _byte_order != BYTE_ORDER, \
 147                           .base = _base,                        \
 148                           .encoding = lttng_encode_##_encoding, \
 149                         }                                       \
 150                 },                                              \
 151         }                                                       \
 152
 153 #define LTTNG_UST_INTEGER_TYPE_PADDING  24
 154 struct lttng_integer_type {
 155         unsigned int size;              /* in bits */
 156         unsigned short alignment;       /* in bits */
 157         unsigned int signedness:1;
 158         unsigned int reverse_byte_order:1;
 159         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 160         enum lttng_string_encodings encoding;
 161         char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
 162 };
 163
 164 /*
 165  * Only float and double are supported. long double is not supported at
 166  * the moment.
 167  */
 168 #define _float_mant_dig(_type)                                          \
 169         (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG                  \
 170                 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG       \
 171                 : 0))
 172
 173 #define __type_float(_type)                                     \
 174         {                                                       \
 175           .atype = atype_float,                                 \
 176           .u =                                                  \
 177                 {                                               \
 178                   ._float =                                     \
 179                         {                                       \
 180                           .exp_dig = sizeof(_type) * CHAR_BIT   \
 181                                           - _float_mant_dig(_type), \
 182                           .mant_dig = _float_mant_dig(_type),   \
 183                           .alignment = lttng_alignof(_type) * CHAR_BIT, \
 184                           .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
 185                         }                                       \
 186                 }                                               \
 187         }                                                       \
 188
 189 #define LTTNG_UST_FLOAT_TYPE_PADDING    24
 190 struct lttng_float_type {
 191         unsigned int exp_dig;           /* exponent digits, in bits */
 192         unsigned int mant_dig;          /* mantissa digits, in bits */
 193         unsigned short alignment;       /* in bits */
 194         unsigned int reverse_byte_order:1;
 195         char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
 196 };
 197
 198 /* legacy */
 199 #define LTTNG_UST_BASIC_TYPE_PADDING    128
 200 union _lttng_basic_type {
 201         struct lttng_integer_type integer;      /* legacy */
 202         struct {
 203                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 204                 struct lttng_integer_type container_type;
 205         } enumeration;                          /* legacy */
 206         struct {
 207                 enum lttng_string_encodings encoding;
 208         } string;                               /* legacy */
 209         struct lttng_float_type _float;         /* legacy */
 210         char padding[LTTNG_UST_BASIC_TYPE_PADDING];
 211 };
 212
 213 /* legacy */
 214 struct lttng_basic_type {
 215         enum lttng_abstract_types atype;
 216         union {
 217                 union _lttng_basic_type basic;
 218         } u;
 219 };
 220
 221 #define LTTNG_UST_TYPE_PADDING  128
 222 struct lttng_type {
 223         enum lttng_abstract_types atype;
 224         union {
 225                 /* provider ABI 2.0 */
 226                 struct lttng_integer_type integer;
 227                 struct lttng_float_type _float;
 228                 struct {
 229                         enum lttng_string_encodings encoding;
 230                 } string;
 231                 struct {
 232                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 233                         struct lttng_type *container_type;
 234                 } enum_nestable;
 235                 struct {
 236                         const struct lttng_type *elem_type;
 237                         unsigned int length;                    /* Num. elems. */
 238                         unsigned int alignment;
 239                 } array_nestable;
 240                 struct {
 241                         const char *length_name;                /* Length field name. */
 242                         const struct lttng_type *elem_type;
 243                         unsigned int alignment;                 /* Alignment before elements. */
 244                 } sequence_nestable;
 245                 struct {
 246                         unsigned int nr_fields;
 247                         const struct lttng_event_field *fields; /* Array of fields. */
 248                         unsigned int alignment;
 249                 } struct_nestable;
 250
 251                 union {
 252                         /* legacy provider ABI 1.0 */
 253                         union _lttng_basic_type basic;  /* legacy */
 254                         struct {
 255                                 struct lttng_basic_type elem_type;
 256                                 unsigned int length;            /* Num. elems. */
 257                         } array;                        /* legacy */
 258                         struct {
 259                                 struct lttng_basic_type length_type;
 260                                 struct lttng_basic_type elem_type;
 261                         } sequence;                     /* legacy */
 262                         struct {
 263                                 unsigned int nr_fields;
 264                                 struct lttng_event_field *fields;       /* Array of fields. */
 265                         } _struct;                      /* legacy */
 266                 } legacy;
 267                 char padding[LTTNG_UST_TYPE_PADDING];
 268         } u;
 269 };
 270
 271 #define LTTNG_UST_ENUM_TYPE_PADDING     24
 272 struct lttng_enum_desc {
 273         const char *name;
 274         const struct lttng_enum_entry *entries;
 275         unsigned int nr_entries;
 276         char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 277 };
 278
 279 /*
 280  * Event field description
 281  *
 282  * IMPORTANT: this structure is part of the ABI between the probe and
 283  * UST. Fields need to be only added at the end, never reordered, never
 284  * removed.
 285  */
 286
 287 #define LTTNG_UST_EVENT_FIELD_PADDING   28
 288 struct lttng_event_field {
 289         const char *name;
 290         struct lttng_type type;
 291         unsigned int nowrite;   /* do not write into trace */
 292         union {
 293                 struct {
 294                         unsigned int nofilter:1;        /* do not consider for filter */
 295                 } ext;
 296                 char padding[LTTNG_UST_EVENT_FIELD_PADDING];
 297         } u;
 298 };
 299
 300 enum lttng_ust_dynamic_type {
 301         LTTNG_UST_DYNAMIC_TYPE_NONE,
 302         LTTNG_UST_DYNAMIC_TYPE_S8,
 303         LTTNG_UST_DYNAMIC_TYPE_S16,
 304         LTTNG_UST_DYNAMIC_TYPE_S32,
 305         LTTNG_UST_DYNAMIC_TYPE_S64,
 306         LTTNG_UST_DYNAMIC_TYPE_U8,
 307         LTTNG_UST_DYNAMIC_TYPE_U16,
 308         LTTNG_UST_DYNAMIC_TYPE_U32,
 309         LTTNG_UST_DYNAMIC_TYPE_U64,
 310         LTTNG_UST_DYNAMIC_TYPE_FLOAT,
 311         LTTNG_UST_DYNAMIC_TYPE_DOUBLE,
 312         LTTNG_UST_DYNAMIC_TYPE_STRING,
 313         _NR_LTTNG_UST_DYNAMIC_TYPES,
 314 };
 315
 316 struct lttng_ctx_value {
 317         enum lttng_ust_dynamic_type sel;
 318         union {
 319                 int64_t s64;
 320                 uint64_t u64;
 321                 const char *str;
 322                 double d;
 323         } u;
 324 };
 325
 326 struct lttng_perf_counter_field;
 327
 328 #define LTTNG_UST_CTX_FIELD_PADDING     40
 329 struct lttng_ctx_field {
 330         struct lttng_event_field event_field;
 331         size_t (*get_size)(struct lttng_ctx_field *field, size_t offset);
 332         void (*record)(struct lttng_ctx_field *field,
 333                        struct lttng_ust_lib_ring_buffer_ctx *ctx,
 334                        struct lttng_channel *chan);
 335         void (*get_value)(struct lttng_ctx_field *field,
 336                          struct lttng_ctx_value *value);
 337         union {
 338                 struct lttng_perf_counter_field *perf_counter;
 339                 char padding[LTTNG_UST_CTX_FIELD_PADDING];
 340         } u;
 341         void (*destroy)(struct lttng_ctx_field *field);
 342         char *field_name;       /* Has ownership, dynamically allocated. */
 343 };
 344
 345 #define LTTNG_UST_CTX_PADDING   20
 346 struct lttng_ctx {
 347         struct lttng_ctx_field *fields;
 348         unsigned int nr_fields;
 349         unsigned int allocated_fields;
 350         unsigned int largest_align;
 351         char padding[LTTNG_UST_CTX_PADDING];
 352 };
 353
 354 #define LTTNG_UST_EVENT_DESC_PADDING    40
 355 struct lttng_event_desc {
 356         const char *name;
 357         void (*probe_callback)(void);
 358         const struct lttng_event_ctx *ctx;      /* context */
 359         const struct lttng_event_field *fields; /* event payload */
 360         unsigned int nr_fields;
 361         const int **loglevel;
 362         const char *signature;  /* Argument types/names received */
 363         union {
 364                 struct {
 365                         const char **model_emf_uri;
 366                         void (*event_notifier_callback)(void);
 367                 } ext;
 368                 char padding[LTTNG_UST_EVENT_DESC_PADDING];
 369         } u;
 370 };
 371
 372 #define LTTNG_UST_PROBE_DESC_PADDING    12
 373 struct lttng_probe_desc {
 374         const char *provider;
 375         const struct lttng_event_desc **event_desc;
 376         unsigned int nr_events;
 377         struct cds_list_head head;              /* chain registered probes */
 378         struct cds_list_head lazy_init_head;
 379         int lazy;                               /* lazy registration */
 380         uint32_t major;
 381         uint32_t minor;
 382         char padding[LTTNG_UST_PROBE_DESC_PADDING];
 383 };
 384
 385 /* Data structures used by the tracer. */
 386
 387 enum lttng_enabler_format_type {
 388         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 389         LTTNG_ENABLER_FORMAT_EVENT,
 390 };
 391
 392 /*
 393  * Enabler field, within whatever object is enabling an event. Target of
 394  * backward reference.
 395  */
 396 struct lttng_enabler {
 397         enum lttng_enabler_format_type format_type;
 398
 399         /* head list of struct lttng_ust_filter_bytecode_node */
 400         struct cds_list_head filter_bytecode_head;
 401         /* head list of struct lttng_ust_excluder_node */
 402         struct cds_list_head excluder_head;
 403
 404         struct lttng_ust_event event_param;
 405         unsigned int enabled:1;
 406 };
 407
 408 struct tp_list_entry {
 409         struct lttng_ust_tracepoint_iter tp;
 410         struct cds_list_head head;
 411 };
 412
 413 struct lttng_ust_tracepoint_list {
 414         struct tp_list_entry *iter;
 415         struct cds_list_head head;
 416 };
 417
 418 struct tp_field_list_entry {
 419         struct lttng_ust_field_iter field;
 420         struct cds_list_head head;
 421 };
 422
 423 struct lttng_ust_field_list {
 424         struct tp_field_list_entry *iter;
 425         struct cds_list_head head;
 426 };
 427
 428 struct ust_pending_probe;
 429 struct lttng_event;
 430
 431 /*
 432  * Bytecode interpreter return value masks.
 433  */
 434 enum lttng_bytecode_interpreter_ret {
 435         LTTNG_INTERPRETER_DISCARD = 0,
 436         LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
 437         /* Other bits are kept for future use. */
 438 };
 439
 440 struct lttng_interpreter_output;
 441
 442 /*
 443  * This structure is used in the probes. More specifically, the `filter` and
 444  * `node` fields are explicity used in the probes. When modifying this
 445  * structure we must not change the layout of these two fields as it is
 446  * considered ABI.
 447  */
 448 struct lttng_bytecode_runtime {
 449         /* Associated bytecode */
 450         struct lttng_ust_bytecode_node *bc;
 451         union {
 452                 uint64_t (*filter)(void *interpreter_data,
 453                                 const char *interpreter_stack_data);
 454                 uint64_t (*capture)(void *interpreter_data,
 455                                 const char *interpreter_stack_data,
 456                                 struct lttng_interpreter_output *interpreter_output);
 457         } interpreter_funcs;
 458         int link_failed;
 459         struct cds_list_head node;      /* list of bytecode runtime in event */
 460         /*
 461          * Pointer to a URCU-protected pointer owned by an `struct
 462          * lttng_session`or `struct lttng_event_notifier_group`.
 463          */
 464         struct lttng_ctx **pctx;
 465 };
 466
 467 /*
 468  * Objects in a linked-list of enablers, owned by an event or event_notifier.
 469  * This is used because an event (or a event_notifier) can be enabled by more
 470  * than one enabler and we want a quick way to iterate over all enablers of an
 471  * object.
 472  *
 473  * For example, event rules "my_app:a*" and "my_app:ab*" will both match the
 474  * event with the name "my_app:abc".
 475  */
 476 struct lttng_enabler_ref {
 477         struct cds_list_head node;              /* enabler ref list */
 478         struct lttng_enabler *ref;              /* backward ref */
 479 };
 480
 481 /*
 482  * lttng_event structure is referred to by the tracing fast path. It
 483  * must be kept small.
 484  *
 485  * IMPORTANT: this structure is part of the ABI between the probe and
 486  * UST. Fields need to be only added at the end, never reordered, never
 487  * removed.
 488  */
 489 struct lttng_event {
 490         unsigned int id;
 491         struct lttng_channel *chan;
 492         int enabled;
 493         const struct lttng_event_desc *desc;
 494         struct lttng_ctx *ctx;
 495         enum lttng_ust_instrumentation instrumentation;
 496         struct cds_list_head node;              /* Event list in session */
 497
 498         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 499         struct cds_list_head filter_bytecode_runtime_head;
 500         int has_enablers_without_bytecode;
 501         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 502         struct cds_list_head enablers_ref_head;
 503         struct cds_hlist_node hlist;    /* session ht of events */
 504         int registered;                 /* has reg'd tracepoint probe */
 505 };
 506
 507 struct lttng_event_notifier {
 508         uint64_t user_token;
 509         uint64_t error_counter_index;
 510         int enabled;
 511         int registered;                 /* has reg'd tracepoint probe */
 512         size_t num_captures;            /* Needed to allocate the msgpack array. */
 513         void (*notification_send)(struct lttng_event_notifier *event_notifier,
 514                 const char *stack_data);
 515         struct cds_list_head filter_bytecode_runtime_head;
 516         struct cds_list_head capture_bytecode_runtime_head;
 517         int has_enablers_without_bytecode;
 518         struct cds_list_head enablers_ref_head;
 519         const struct lttng_event_desc *desc;
 520         struct cds_hlist_node hlist;    /* hashtable of event_notifiers */
 521         struct cds_list_head node;      /* event_notifier list in session */
 522         struct lttng_event_notifier_group *group; /* weak ref */
 523 };
 524
 525 struct lttng_enum {
 526         const struct lttng_enum_desc *desc;
 527         struct lttng_session *session;
 528         struct cds_list_head node;      /* Enum list in session */
 529         struct cds_hlist_node hlist;    /* Session ht of enums */
 530         uint64_t id;                    /* Enumeration ID in sessiond */
 531 };
 532
 533 struct channel;
 534 struct lttng_ust_shm_handle;
 535
 536 /*
 537  * IMPORTANT: this structure is part of the ABI between the probe and
 538  * UST. Fields need to be only added at the end, never reordered, never
 539  * removed.
 540  */
 541 struct lttng_channel_ops {
 542         struct lttng_channel *(*channel_create)(const char *name,
 543                         void *buf_addr,
 544                         size_t subbuf_size, size_t num_subbuf,
 545                         unsigned int switch_timer_interval,
 546                         unsigned int read_timer_interval,
 547                         unsigned char *uuid,
 548                         uint32_t chan_id,
 549                         const int *stream_fds, int nr_stream_fds,
 550                         int64_t blocking_timeout);
 551         void (*channel_destroy)(struct lttng_channel *chan);
 552         int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 553                              uint32_t event_id);
 554         void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
 555         void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 556                         const void *src, size_t len);
 557         /*
 558          * packet_avail_size returns the available size in the current
 559          * packet. Note that the size returned is only a hint, since it
 560          * may change due to concurrent writes.
 561          */
 562         size_t (*packet_avail_size)(struct channel *chan,
 563                                     struct lttng_ust_shm_handle *handle);
 564         int (*is_finalized)(struct channel *chan);
 565         int (*is_disabled)(struct channel *chan);
 566         int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
 567         void (*event_strcpy)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 568                         const char *src, size_t len);
 569 };
 570
 571 /*
 572  * IMPORTANT: this structure is part of the ABI between the probe and
 573  * UST. Fields need to be only added at the end, never reordered, never
 574  * removed.
 575  */
 576 struct lttng_channel {
 577         /*
 578          * The pointers located in this private data are NOT safe to be
 579          * dereferenced by the consumer. The only operations the
 580          * consumer process is designed to be allowed to do is to read
 581          * and perform subbuffer flush.
 582          */
 583         struct channel *chan;           /* Channel buffers */
 584         int enabled;
 585         struct lttng_ctx *ctx;
 586         /* Event ID management */
 587         struct lttng_session *session;
 588         int objd;                       /* Object associated to channel */
 589         struct cds_list_head node;      /* Channel list in session */
 590         const struct lttng_channel_ops *ops;
 591         int header_type;                /* 0: unset, 1: compact, 2: large */
 592         struct lttng_ust_shm_handle *handle;    /* shared-memory handle */
 593
 594         /* Channel ID */
 595         unsigned int id;
 596         enum lttng_ust_chan_type type;
 597         unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
 598         int tstate:1;                   /* Transient enable state */
 599 };
 600
 601 #define LTTNG_COUNTER_DIMENSION_MAX     8
 602
 603 struct lttng_counter_dimension {
 604         uint64_t size;
 605         uint64_t underflow_index;
 606         uint64_t overflow_index;
 607         uint8_t has_underflow;
 608         uint8_t has_overflow;
 609 };
 610
 611 struct lttng_counter_ops {
 612         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 613                         const struct lttng_counter_dimension *dimensions,
 614                         int64_t global_sum_step,
 615                         int global_counter_fd,
 616                         int nr_counter_cpu_fds,
 617                         const int *counter_cpu_fds,
 618                         bool is_daemon);
 619         void (*counter_destroy)(struct lib_counter *counter);
 620         int (*counter_add)(struct lib_counter *counter,
 621                         const size_t *dimension_indexes, int64_t v);
 622         int (*counter_read)(struct lib_counter *counter,
 623                         const size_t *dimension_indexes, int cpu,
 624                         int64_t *value, bool *overflow, bool *underflow);
 625         int (*counter_aggregate)(struct lib_counter *counter,
 626                         const size_t *dimension_indexes, int64_t *value,
 627                         bool *overflow, bool *underflow);
 628         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 629 };
 630
 631 #define LTTNG_UST_STACK_CTX_PADDING     32
 632 struct lttng_stack_ctx {
 633         struct lttng_event *event;
 634         struct lttng_ctx *chan_ctx;     /* RCU dereferenced. */
 635         struct lttng_ctx *event_ctx;    /* RCU dereferenced. */
 636         char padding[LTTNG_UST_STACK_CTX_PADDING];
 637 };
 638
 639 #define LTTNG_UST_EVENT_HT_BITS         12
 640 #define LTTNG_UST_EVENT_HT_SIZE         (1U << LTTNG_UST_EVENT_HT_BITS)
 641
 642 struct lttng_ust_event_ht {
 643         struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
 644 };
 645
 646 #define LTTNG_UST_EVENT_NOTIFIER_HT_BITS                12
 647 #define LTTNG_UST_EVENT_NOTIFIER_HT_SIZE                (1U << LTTNG_UST_EVENT_NOTIFIER_HT_BITS)
 648 struct lttng_ust_event_notifier_ht {
 649         struct cds_hlist_head table[LTTNG_UST_EVENT_NOTIFIER_HT_SIZE];
 650 };
 651
 652 #define LTTNG_UST_ENUM_HT_BITS          12
 653 #define LTTNG_UST_ENUM_HT_SIZE          (1U << LTTNG_UST_ENUM_HT_BITS)
 654
 655 struct lttng_ust_enum_ht {
 656         struct cds_hlist_head table[LTTNG_UST_ENUM_HT_SIZE];
 657 };
 658
 659 /*
 660  * IMPORTANT: this structure is part of the ABI between the probe and
 661  * UST. Fields need to be only added at the end, never reordered, never
 662  * removed.
 663  */
 664 struct lttng_session {
 665         int active;                             /* Is trace session active ? */
 666         int been_active;                        /* Been active ? */
 667         int objd;                               /* Object associated */
 668         struct cds_list_head chan_head;         /* Channel list head */
 669         struct cds_list_head events_head;       /* list of events */
 670         struct cds_list_head node;              /* Session list */
 671
 672         /* New UST 2.1 */
 673         /* List of enablers */
 674         struct cds_list_head enablers_head;
 675         struct lttng_ust_event_ht events_ht;    /* ht of events */
 676         void *owner;                            /* object owner */
 677         int tstate:1;                           /* Transient enable state */
 678
 679         /* New UST 2.4 */
 680         int statedump_pending:1;
 681
 682         /* New UST 2.8 */
 683         struct lttng_ust_enum_ht enums_ht;      /* ht of enumerations */
 684         struct cds_list_head enums_head;
 685         struct lttng_ctx *ctx;                  /* contexts for filters. */
 686 };
 687
 688 struct lttng_counter {
 689         int objd;
 690         struct lttng_event_notifier_group *event_notifier_group;    /* owner */
 691         struct lttng_counter_transport *transport;
 692         struct lib_counter *counter;
 693         struct lttng_counter_ops *ops;
 694 };
 695
 696 struct lttng_event_notifier_group {
 697         int objd;
 698         void *owner;
 699         int notification_fd;
 700         struct cds_list_head node;              /* Event notifier group handle list */
 701         struct cds_list_head enablers_head;
 702         struct cds_list_head event_notifiers_head;      /* list of event_notifiers */
 703         struct lttng_ust_event_notifier_ht event_notifiers_ht; /* hashtable of event_notifiers */
 704         struct lttng_ctx *ctx;                  /* contexts for filters. */
 705
 706         struct lttng_counter *error_counter;
 707         size_t error_counter_len;
 708 };
 709
 710 struct lttng_transport {
 711         char *name;
 712         struct cds_list_head node;
 713         struct lttng_channel_ops ops;
 714         const struct lttng_ust_lib_ring_buffer_config *client_config;
 715 };
 716
 717 struct lttng_counter_transport {
 718         char *name;
 719         struct cds_list_head node;
 720         struct lttng_counter_ops ops;
 721         const struct lib_counter_config *client_config;
 722 };
 723
 724 struct lttng_session *lttng_session_create(void);
 725 int lttng_session_enable(struct lttng_session *session);
 726 int lttng_session_disable(struct lttng_session *session);
 727 int lttng_session_statedump(struct lttng_session *session);
 728 void lttng_session_destroy(struct lttng_session *session);
 729
 730 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 731                                        const char *transport_name,
 732                                        void *buf_addr,
 733                                        size_t subbuf_size, size_t num_subbuf,
 734                                        unsigned int switch_timer_interval,
 735                                        unsigned int read_timer_interval,
 736                                        int **shm_fd, int **wait_fd,
 737                                        uint64_t **memory_map_size,
 738                                        struct lttng_channel *chan_priv_init);
 739
 740 int lttng_channel_enable(struct lttng_channel *channel);
 741 int lttng_channel_disable(struct lttng_channel *channel);
 742
 743 int lttng_attach_context(struct lttng_ust_context *context_param,
 744                 union ust_args *uargs,
 745                 struct lttng_ctx **ctx, struct lttng_session *session);
 746 void lttng_transport_register(struct lttng_transport *transport);
 747 void lttng_transport_unregister(struct lttng_transport *transport);
 748
 749 int lttng_probe_register(struct lttng_probe_desc *desc);
 750 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 751 void lttng_probe_provider_unregister_events(struct lttng_probe_desc *desc);
 752 int lttng_fix_pending_events(void);
 753 int lttng_probes_init(void);
 754 void lttng_probes_exit(void);
 755 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 756 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 757 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
 758 void lttng_context_update(struct lttng_ctx *ctx);
 759 void lttng_remove_context_field(struct lttng_ctx **ctx_p,
 760                                 struct lttng_ctx_field *field);
 761 void lttng_destroy_context(struct lttng_ctx *ctx);
 762 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 763 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 764 int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
 765 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 766 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
 767 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 768 int lttng_add_dyntest_to_ctx(struct lttng_ctx **ctx);
 769 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 770 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 771 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 772 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 773 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 774 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 775 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 776 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
 777 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
 778 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
 779 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
 780 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
 781 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
 782 void lttng_context_vtid_reset(void);
 783 void lttng_context_vpid_reset(void);
 784 void lttng_context_procname_reset(void);
 785 void lttng_context_cgroup_ns_reset(void);
 786 void lttng_context_ipc_ns_reset(void);
 787 void lttng_context_mnt_ns_reset(void);
 788 void lttng_context_net_ns_reset(void);
 789 void lttng_context_pid_ns_reset(void);
 790 void lttng_context_user_ns_reset(void);
 791 void lttng_context_uts_ns_reset(void);
 792 void lttng_context_vuid_reset(void);
 793 void lttng_context_veuid_reset(void);
 794 void lttng_context_vsuid_reset(void);
 795 void lttng_context_vgid_reset(void);
 796 void lttng_context_vegid_reset(void);
 797 void lttng_context_vsgid_reset(void);
 798
 799 #ifdef LTTNG_UST_HAVE_PERF_EVENT
 800 int lttng_add_perf_counter_to_ctx(uint32_t type,
 801                                   uint64_t config,
 802                                   const char *name,
 803                                   struct lttng_ctx **ctx);
 804 int lttng_perf_counter_init(void);
 805 void lttng_perf_counter_exit(void);
 806 #else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 807 static inline
 808 int lttng_add_perf_counter_to_ctx(uint32_t type,
 809                                   uint64_t config,
 810                                   const char *name,
 811                                   struct lttng_ctx **ctx)
 812 {
 813         return -ENOSYS;
 814 }
 815 static inline
 816 int lttng_perf_counter_init(void)
 817 {
 818         return 0;
 819 }
 820 static inline
 821 void lttng_perf_counter_exit(void)
 822 {
 823 }
 824 #endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
 825
 826 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
 827 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
 828 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 829
 830 struct lttng_transport *lttng_transport_find(const char *name);
 831
 832 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 833 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
 834 struct lttng_ust_tracepoint_iter *
 835         lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
 836 int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
 837 void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
 838 struct lttng_ust_field_iter *
 839         lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
 840
 841 void lttng_free_event_filter_runtime(struct lttng_event *event);
 842
 843 struct cds_list_head *lttng_get_probe_list_head(void);
 844 int lttng_session_active(void);
 845
 846 typedef int (*t_statedump_func_ptr)(struct lttng_session *session);
 847 void lttng_handle_pending_statedump(void *owner);
 848 struct cds_list_head *_lttng_get_sessions(void);
 849
 850 struct lttng_enum *lttng_ust_enum_get_from_desc(struct lttng_session *session,
 851                 const struct lttng_enum_desc *enum_desc);
 852
 853 void lttng_ust_dl_update(void *ip);
 854 void lttng_ust_fixup_fd_tracker_tls(void);
 855
 856 #ifdef __cplusplus
 857 }
 858 #endif
 859
 860 #endif /* _LTTNG_UST_EVENTS_H */