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 <lttng/kernel-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) < (type) 1)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lttng_kernel_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 lttng_kernel_type {
  39         lttng_kernel_type_integer,
  40         lttng_kernel_type_string,
  41         lttng_kernel_type_enum,
  42         lttng_kernel_type_array,
  43         lttng_kernel_type_sequence,
  44         lttng_kernel_type_struct,
  45         lttng_kernel_type_variant,
  46         NR_LTTNG_KERNEL_TYPES,
  47 };
  48
  49 enum lttng_kernel_string_encoding {
  50         lttng_kernel_string_encoding_none = 0,
  51         lttng_kernel_string_encoding_UTF8 = 1,
  52         lttng_kernel_string_encoding_ASCII = 2,
  53         NR_LTTNG_KERNEL_STRING_ENCODING,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_kernel_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_kernel_enum_entry {
  67         struct lttng_kernel_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 /*
  75  * struct lttng_kernel_type_common is fixed-size. Its children inherits
  76  * from it by embedding struct lttng_kernel_type_common as its first field.
  77  */
  78 struct lttng_kernel_type_common {
  79         enum lttng_kernel_type type;
  80 };
  81
  82 struct lttng_kernel_type_integer {
  83         struct lttng_kernel_type_common parent;
  84         unsigned int size;              /* in bits */
  85         unsigned short alignment;       /* in bits */
  86         unsigned int signedness:1,
  87                 reverse_byte_order:1;
  88         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  89 };
  90
  91 struct lttng_kernel_type_string {
  92         struct lttng_kernel_type_common parent;
  93         enum lttng_kernel_string_encoding encoding;
  94 };
  95
  96 struct lttng_kernel_type_enum {
  97         struct lttng_kernel_type_common parent;
  98         const struct lttng_kernel_enum_desc *desc;      /* Enumeration mapping */
  99         const struct lttng_kernel_type_common *container_type;
 100 };
 101
 102 struct lttng_kernel_type_array {
 103         struct lttng_kernel_type_common parent;
 104         const struct lttng_kernel_type_common *elem_type;
 105         unsigned int length;                    /* Num. elems. */
 106         unsigned int alignment;
 107         enum lttng_kernel_string_encoding encoding;
 108 };
 109
 110 struct lttng_kernel_type_sequence {
 111         struct lttng_kernel_type_common parent;
 112         const char *length_name;        /* Length field name. If NULL, use previous field. */
 113         const struct lttng_kernel_type_common *elem_type;
 114         unsigned int alignment;         /* Alignment before elements. */
 115         enum lttng_kernel_string_encoding encoding;
 116 };
 117
 118 struct lttng_kernel_type_struct {
 119         struct lttng_kernel_type_common parent;
 120         unsigned int nr_fields;
 121         const struct lttng_kernel_event_field **fields; /* Array of pointers to fields. */
 122         unsigned int alignment;
 123 };
 124
 125 struct lttng_kernel_type_variant {
 126         struct lttng_kernel_type_common parent;
 127         const char *tag_name;           /* Tag field name. If NULL, use previous field. */
 128         const struct lttng_kernel_event_field **choices; /* Array of pointers to fields. */
 129         unsigned int nr_choices;
 130         unsigned int alignment;
 131 };
 132
 133 struct lttng_kernel_enum_desc {
 134         const char *name;
 135         const struct lttng_kernel_enum_entry **entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_kernel_event_field {
 142         const char *name;
 143         const struct lttng_kernel_type_common *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 #define lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, _base)            \
 150         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_integer, { \
 151                 .parent = {                                                                             \
 152                         .type = lttng_kernel_type_integer,                                                      \
 153                 },                                                                                      \
 154                 .size = (_size),                                                                        \
 155                 .alignment = (_alignment),                                                              \
 156                 .signedness = (_signedness),                                                            \
 157                 .reverse_byte_order = (_byte_order) != __BYTE_ORDER,                                    \
 158                 .base = (_base),                                                                        \
 159         }))
 160
 161 #define lttng_kernel_static_type_integer_from_type(_type, _byte_order, _base)                           \
 162         lttng_kernel_static_type_integer(sizeof(_type) * CHAR_BIT,                                      \
 163                         lttng_alignof(_type) * CHAR_BIT,                                                \
 164                         lttng_is_signed_type(_type),                                                    \
 165                         _byte_order,                                                                    \
 166                         _base)
 167
 168 #define lttng_kernel_static_type_enum(_desc, _container_type)                                           \
 169         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_enum, { \
 170                 .parent = {                                                                             \
 171                         .type = lttng_kernel_type_enum,                                                 \
 172                 },                                                                                      \
 173                 .desc = (_desc),                                                                        \
 174                 .container_type = (_container_type),                                                    \
 175         }))
 176
 177 #define lttng_kernel_static_type_array(_length, _elem_type, _alignment, _encoding)                      \
 178         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_array, { \
 179                 .parent = {                                                                             \
 180                         .type = lttng_kernel_type_array,                                                \
 181                 },                                                                                      \
 182                 .length = (_length),                                                                    \
 183                 .alignment = (_alignment),                                                              \
 184                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 185                 .elem_type = (_elem_type),                                                              \
 186         }))
 187
 188 #define lttng_kernel_static_type_array_text(_length)                                                    \
 189         lttng_kernel_static_type_array(_length,                                                         \
 190                 lttng_kernel_static_type_integer(sizeof(char) * CHAR_BIT,                               \
 191                                 lttng_alignof(char) * CHAR_BIT, lttng_is_signed_type(char),             \
 192                                 __BYTE_ORDER, 10),                                                      \
 193                 0, UTF8)
 194
 195 #define lttng_kernel_static_type_sequence(_length_name, _elem_type, _alignment, _encoding)                      \
 196         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_sequence, { \
 197                 .parent = {                                                                             \
 198                         .type = lttng_kernel_type_sequence,                                             \
 199                 },                                                                                      \
 200                 .length_name = (_length_name),                                                          \
 201                 .alignment = (_alignment),                                                              \
 202                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 203                 .elem_type = (_elem_type),                                                              \
 204         }))
 205
 206 #define lttng_kernel_static_type_string(_encoding)                                                      \
 207         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_string, { \
 208                 .parent = {                                                                             \
 209                         .type = lttng_kernel_type_string,                                               \
 210                 },                                                                                      \
 211                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 212         }))
 213
 214 #define lttng_kernel_static_type_struct(_nr_fields, _fields, _alignment)                                \
 215         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_struct, { \
 216                 .parent = {                                                                             \
 217                         .type = lttng_kernel_type_struct,                                               \
 218                 },                                                                                      \
 219                 .nr_fields = (_nr_fields),                                                              \
 220                 .fields = _fields,                                                                      \
 221                 .alignment = (_alignment),                                                              \
 222         }))
 223
 224 #define lttng_kernel_static_type_variant(_nr_choices, _choices, _tag_name, _alignment)                  \
 225         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_variant, { \
 226                 .parent = {                                                                             \
 227                         .type = lttng_kernel_type_variant,                                              \
 228                 },                                                                                      \
 229                 .tag_name = (_tag_name),                                                                \
 230                 .choices = _choices,                                                                    \
 231                 .nr_choices = (_nr_choices),                                                            \
 232                 .alignment = (_alignment),                                                              \
 233         }))
 234
 235 #define lttng_kernel_static_event_field(_name, _type, _nowrite, _user, _nofilter)                       \
 236         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field, {                               \
 237                 .name = (_name),                                                                        \
 238                 .type = (_type),                                                                        \
 239                 .nowrite = (_nowrite),                                                                  \
 240                 .user = (_user),                                                                        \
 241                 .nofilter = (_nofilter),                                                                \
 242         })
 243
 244 #define lttng_kernel_static_event_field_array(_fields...)                                               \
 245         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field *,                               \
 246                 _fields                                                                                 \
 247         )
 248
 249 #define lttng_kernel_static_enum_entry_value(_string, _value)                                           \
 250         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 251                 .start = {                                                                              \
 252                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 253                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 254                                 (long long) (_value) : (_value),                                        \
 255                 },                                                                                      \
 256                 .end = {                                                                                \
 257                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 258                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 259                                 (long long) (_value) : (_value),                                        \
 260                 },                                                                                      \
 261                 .string = (_string),                                                                    \
 262         }),
 263
 264 #define lttng_kernel_static_enum_entry_range(_string, _range_start, _range_end)                         \
 265         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 266                 .start = {                                                                              \
 267                         .signedness = lttng_is_signed_type(__typeof__(_range_start)),                   \
 268                         .value = lttng_is_signed_type(__typeof__(_range_start)) ?                       \
 269                                 (long long) (_range_start) : (_range_start),                            \
 270                 },                                                                                      \
 271                 .end = {                                                                                \
 272                         .signedness = lttng_is_signed_type(__typeof__(_range_end)),                     \
 273                         .value = lttng_is_signed_type(__typeof__(_range_end)) ?                         \
 274                                 (long long) (_range_end) : (_range_end),                                \
 275                 },                                                                                      \
 276                 .string = (_string),                                                                    \
 277         }),
 278
 279 #define lttng_kernel_static_enum_entry_auto(_string)                                                    \
 280         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 281                 .start = {                                                                              \
 282                         .signedness = -1,                                                               \
 283                         .value = -1,                                                                    \
 284                 },                                                                                      \
 285                 .end = {                                                                                \
 286                         .signedness = -1,                                                               \
 287                         .value = -1,                                                                    \
 288                 },                                                                                      \
 289                 .string = (_string),                                                                    \
 290                 .options = {                                                                            \
 291                         .is_auto = 1,                                                                   \
 292                 }                                                                                       \
 293         }),
 294
 295 struct lttng_kernel_probe_ctx {
 296         struct lttng_kernel_event_common *event;
 297         uint8_t interruptible;
 298 };
 299
 300 struct lttng_kernel_event_desc {
 301         const char *event_name;         /* lttng-modules name */
 302         const char *event_kname;        /* Linux kernel name (tracepoints) */
 303         const struct lttng_kernel_probe_desc *probe_desc;
 304         void (*probe_callback)(void);
 305         const struct lttng_kernel_event_field **fields; /* event payload */
 306         unsigned int nr_fields;
 307         struct module *owner;
 308 };
 309
 310 struct lttng_kernel_probe_desc {
 311         const char *provider_name;
 312         const struct lttng_kernel_event_desc **event_desc;
 313         unsigned int nr_events;
 314         struct list_head head;                  /* chain registered probes */
 315         struct list_head lazy_init_head;
 316         int lazy;                               /* lazy registration */
 317 };
 318
 319 /*
 320  * Result of the run_filter() callback.
 321  */
 322 enum lttng_kernel_event_filter_result {
 323         LTTNG_KERNEL_EVENT_FILTER_ACCEPT = 0,
 324         LTTNG_KERNEL_EVENT_FILTER_REJECT = 1,
 325 };
 326
 327 struct lttng_kernel_event_common_private;
 328
 329 enum lttng_kernel_event_type {
 330         LTTNG_KERNEL_EVENT_TYPE_RECORDER = 0,
 331         LTTNG_KERNEL_EVENT_TYPE_NOTIFIER = 1,
 332 };
 333
 334 struct lttng_kernel_event_common {
 335         struct lttng_kernel_event_common_private *priv; /* Private event interface */
 336
 337         enum lttng_kernel_event_type type;
 338         /* Get child with container_of(). */
 339
 340         int enabled;
 341         int eval_filter;                                /* Need to evaluate filters */
 342         int (*run_filter)(const struct lttng_kernel_event_common *event,
 343                 const char *stack_data,
 344                 struct lttng_kernel_probe_ctx *probe_ctx,
 345                 void *filter_ctx);
 346 };
 347
 348 struct lttng_kernel_event_recorder_private;
 349
 350 struct lttng_kernel_event_recorder {
 351         struct lttng_kernel_event_common parent;
 352         struct lttng_kernel_event_recorder_private *priv;       /* Private event record interface */
 353
 354         struct lttng_channel *chan;
 355 };
 356
 357 struct lttng_kernel_notification_ctx {
 358         int eval_capture;                                       /* Capture evaluation available. */
 359 };
 360
 361 struct lttng_kernel_event_notifier_private;
 362
 363 struct lttng_kernel_event_notifier {
 364         struct lttng_kernel_event_common parent;
 365         struct lttng_kernel_event_notifier_private *priv;       /* Private event notifier interface */
 366
 367         int eval_capture;                               /* Need to evaluate capture */
 368         void (*notification_send)(struct lttng_kernel_event_notifier *event_notifier,
 369                 const char *stack_data,
 370                 struct lttng_kernel_probe_ctx *probe_ctx,
 371                 struct lttng_kernel_notification_ctx *notif_ctx);
 372 };
 373
 374 struct lttng_kernel_channel_buffer_ops {
 375         struct lttng_kernel_channel_buffer_ops_private *priv;   /* Private channel buffer ops interface. */
 376
 377         int (*event_reserve)(struct lttng_kernel_ring_buffer_ctx *ctx);
 378         void (*event_commit)(struct lttng_kernel_ring_buffer_ctx *ctx);
 379         void (*event_write)(struct lttng_kernel_ring_buffer_ctx *ctx, const void *src,
 380                             size_t len);
 381         void (*event_write_from_user)(struct lttng_kernel_ring_buffer_ctx *ctx,
 382                                       const void *src, size_t len);
 383         void (*event_memset)(struct lttng_kernel_ring_buffer_ctx *ctx,
 384                              int c, size_t len);
 385         void (*event_strcpy)(struct lttng_kernel_ring_buffer_ctx *ctx, const char *src,
 386                              size_t len);
 387         void (*event_strcpy_from_user)(struct lttng_kernel_ring_buffer_ctx *ctx,
 388                                        const char __user *src, size_t len);
 389 };
 390
 391 struct lttng_counter_ops {
 392         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 393                         const size_t *max_nr_elem,      /* for each dimension */
 394                         int64_t global_sum_step);
 395         void (*counter_destroy)(struct lib_counter *counter);
 396         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 397                         int64_t v);
 398         /*
 399          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 400          * the global aggregation counter if @cpu == -1.
 401          */
 402         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 403                          int64_t *value, bool *overflow, bool *underflow);
 404         /*
 405          * counter_aggregate returns the total sum of all per-cpu counters and
 406          * the global aggregation counter.
 407          */
 408         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 409                         int64_t *value, bool *overflow, bool *underflow);
 410         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 411 };
 412
 413 struct lttng_transport {
 414         char *name;
 415         struct module *owner;
 416         struct list_head node;
 417         struct lttng_kernel_channel_buffer_ops ops;
 418 };
 419
 420 struct lttng_counter_transport {
 421         char *name;
 422         struct module *owner;
 423         struct list_head node;
 424         struct lttng_counter_ops ops;
 425 };
 426
 427 struct lttng_syscall_filter;
 428
 429 #define LTTNG_EVENT_HT_BITS             12
 430 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 431
 432 struct lttng_event_ht {
 433         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 434 };
 435
 436 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 437 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 438
 439 struct lttng_event_notifier_ht {
 440         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 441 };
 442
 443 struct lttng_channel {
 444         unsigned int id;
 445         struct channel *chan;           /* Channel buffers */
 446         int enabled;
 447         struct lttng_kernel_ctx *ctx;
 448         /* Event ID management */
 449         struct lttng_session *session;
 450         struct file *file;              /* File associated to channel */
 451         unsigned int free_event_id;     /* Next event ID to allocate */
 452         struct list_head list;          /* Channel list */
 453         struct lttng_kernel_channel_buffer_ops *ops;
 454         struct lttng_transport *transport;
 455         struct hlist_head *sc_table;    /* for syscall tracing */
 456         struct hlist_head *compat_sc_table;
 457         struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
 458         struct hlist_head *compat_sc_exit_table;
 459         struct hlist_head sc_unknown;   /* for unknown syscalls */
 460         struct hlist_head sc_compat_unknown;
 461         struct hlist_head sc_exit_unknown;
 462         struct hlist_head compat_sc_exit_unknown;
 463         struct lttng_syscall_filter *sc_filter;
 464         int header_type;                /* 0: unset, 1: compact, 2: large */
 465         enum channel_type channel_type;
 466         int syscall_all_entry;
 467         int syscall_all_exit;
 468         unsigned int metadata_dumped:1,
 469                 sys_enter_registered:1,
 470                 sys_exit_registered:1,
 471                 tstate:1;               /* Transient enable state */
 472 };
 473
 474 struct lttng_metadata_stream {
 475         void *priv;                     /* Ring buffer private data */
 476         struct lttng_metadata_cache *metadata_cache;
 477         unsigned int metadata_in;       /* Bytes read from the cache */
 478         unsigned int metadata_out;      /* Bytes consumed from stream */
 479         int finalized;                  /* Has channel been finalized */
 480         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 481         struct list_head list;          /* Stream list */
 482         struct lttng_transport *transport;
 483         uint64_t version;               /* Current version of the metadata cache */
 484         bool coherent;                  /* Stream in a coherent state */
 485 };
 486
 487 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 488
 489 struct lttng_dynamic_len_stack {
 490         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 491         size_t offset;
 492 };
 493
 494 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 495
 496 /*
 497  * struct lttng_id_tracker declared in header due to deferencing of *v
 498  * in RCU_INITIALIZER(v).
 499  */
 500 #define LTTNG_ID_HASH_BITS      6
 501 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 502
 503 enum tracker_type {
 504         TRACKER_PID,
 505         TRACKER_VPID,
 506         TRACKER_UID,
 507         TRACKER_VUID,
 508         TRACKER_GID,
 509         TRACKER_VGID,
 510
 511         TRACKER_UNKNOWN,
 512 };
 513
 514 struct lttng_id_tracker_rcu {
 515         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 516 };
 517
 518 struct lttng_id_tracker {
 519         struct lttng_session *session;
 520         enum tracker_type tracker_type;
 521         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 522 };
 523
 524 struct lttng_id_hash_node {
 525         struct hlist_node hlist;
 526         int id;
 527 };
 528
 529 struct lttng_session {
 530         int active;                     /* Is trace session active ? */
 531         int been_active;                /* Has trace session been active ? */
 532         struct file *file;              /* File associated to session */
 533         struct list_head chan;          /* Channel list head */
 534         struct list_head events;        /* Event list head */
 535         struct list_head list;          /* Session list */
 536         unsigned int free_chan_id;      /* Next chan ID to allocate */
 537         uuid_le uuid;                   /* Trace session unique ID */
 538         struct lttng_metadata_cache *metadata_cache;
 539         struct lttng_id_tracker pid_tracker;
 540         struct lttng_id_tracker vpid_tracker;
 541         struct lttng_id_tracker uid_tracker;
 542         struct lttng_id_tracker vuid_tracker;
 543         struct lttng_id_tracker gid_tracker;
 544         struct lttng_id_tracker vgid_tracker;
 545         unsigned int metadata_dumped:1,
 546                 tstate:1;               /* Transient enable state */
 547         /* List of event enablers */
 548         struct list_head enablers_head;
 549         /* Hash table of events */
 550         struct lttng_event_ht events_ht;
 551         char name[LTTNG_KERNEL_ABI_SESSION_NAME_LEN];
 552         char creation_time[LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN];
 553 };
 554
 555 struct lttng_counter {
 556         struct file *file;              /* File associated to counter. */
 557         struct file *owner;
 558         struct lttng_counter_transport *transport;
 559         struct lib_counter *counter;
 560         struct lttng_counter_ops *ops;
 561 };
 562
 563 struct lttng_event_notifier_group {
 564         struct file *file;              /* File associated to event notifier group */
 565         struct file *notif_file;        /* File used to expose notifications to userspace. */
 566         struct list_head node;          /* event notifier group list */
 567         struct list_head enablers_head; /* List of enablers */
 568         struct list_head event_notifiers_head; /* List of event notifier */
 569         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 570         struct lttng_kernel_channel_buffer_ops *ops;
 571         struct lttng_transport *transport;
 572         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 573         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 574         wait_queue_head_t read_wait;
 575         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 576         struct lttng_kernel_event_notifier *sc_unknown; /* for unknown syscalls */
 577         struct lttng_kernel_event_notifier *sc_compat_unknown;
 578
 579         struct lttng_syscall_filter *sc_filter;
 580
 581         struct hlist_head *event_notifier_syscall_dispatch;
 582         struct hlist_head *event_notifier_compat_syscall_dispatch;
 583         struct hlist_head *event_notifier_exit_syscall_dispatch;
 584         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 585
 586         struct hlist_head event_notifier_unknown_syscall_dispatch;
 587         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 588         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 589         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 590
 591         int syscall_all_entry;
 592         int syscall_all_exit;
 593
 594         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 595
 596         struct lttng_counter *error_counter;
 597         size_t error_counter_len;
 598 };
 599
 600 int lttng_kernel_probe_register(struct lttng_kernel_probe_desc *desc);
 601 void lttng_kernel_probe_unregister(struct lttng_kernel_probe_desc *desc);
 602
 603 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 604
 605 #endif /* _LTTNG_EVENTS_H */