include/lttng/events.h

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