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/irq_work.h>
  14 #include <linux/version.h>
  15 #include <linux/list.h>
  16 #include <linux/kprobes.h>
  17 #include <linux/kref.h>
  18 #include <linux/uuid.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                         char *syscall_name;
 324                         enum lttng_syscall_entryexit entryexit;
 325                         enum lttng_syscall_abi abi;
 326                 } syscall;
 327         } u;
 328         struct list_head list;          /* Event list in session */
 329         unsigned int metadata_dumped:1;
 330
 331         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 332         struct list_head enablers_ref_head;
 333         struct hlist_node hlist;        /* session ht of events */
 334         int registered;                 /* has reg'd tracepoint probe */
 335         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 336         struct list_head bytecode_runtime_head;
 337         int has_enablers_without_bytecode;
 338 };
 339
 340 // FIXME: Really similar to lttng_event above. Could those be merged ?
 341 struct lttng_event_notifier {
 342         enum lttng_event_type evtype;   /* First field. */
 343         uint64_t user_token;
 344         int enabled;
 345         int registered;                 /* has reg'd tracepoint probe */
 346         const struct lttng_event_desc *desc;
 347         void *filter;
 348         struct list_head list;          /* event_notifier list in event_notifier group */
 349
 350         enum lttng_kernel_instrumentation instrumentation;
 351         union {
 352                 struct lttng_kprobe kprobe;
 353                 struct lttng_uprobe uprobe;
 354         } u;
 355
 356         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 357         struct list_head enablers_ref_head;
 358         struct hlist_node hlist;        /* session ht of event_notifiers */
 359         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 360         struct list_head bytecode_runtime_head;
 361         int has_enablers_without_bytecode;
 362
 363         void (*send_notification)(struct lttng_event_notifier *event_notifier);
 364         struct lttng_event_notifier_group *group; /* Weak ref */
 365 };
 366
 367 enum lttng_enabler_format_type {
 368         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 369         LTTNG_ENABLER_FORMAT_NAME,
 370 };
 371
 372 /*
 373  * Enabler field, within whatever object is enabling an event. Target of
 374  * backward reference.
 375  */
 376 struct lttng_enabler {
 377         enum lttng_event_type evtype;   /* First field. */
 378
 379         enum lttng_enabler_format_type format_type;
 380
 381         /* head list of struct lttng_ust_filter_bytecode_node */
 382         struct list_head filter_bytecode_head;
 383
 384         struct lttng_kernel_event event_param;
 385         unsigned int enabled:1;
 386
 387         uint64_t user_token;            /* User-provided token. */
 388 };
 389
 390 struct lttng_event_enabler {
 391         struct lttng_enabler base;
 392         struct list_head node;  /* per-session list of enablers */
 393         struct lttng_channel *chan;
 394         /*
 395          * Unused, but kept around to make it explicit that the tracer can do
 396          * it.
 397          */
 398         struct lttng_ctx *ctx;
 399 };
 400
 401 struct lttng_event_notifier_enabler {
 402         struct lttng_enabler base;
 403         struct list_head node;  /* List of event_notifier enablers */
 404         struct lttng_event_notifier_group *group;
 405 };
 406
 407 static inline
 408 struct lttng_enabler *lttng_event_enabler_as_enabler(
 409                 struct lttng_event_enabler *event_enabler)
 410 {
 411         return &event_enabler->base;
 412 }
 413
 414 static inline
 415 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 416                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 417 {
 418         return &event_notifier_enabler->base;
 419 }
 420
 421 struct lttng_channel_ops {
 422         struct channel *(*channel_create)(const char *name,
 423                                 void *priv,
 424                                 void *buf_addr,
 425                                 size_t subbuf_size, size_t num_subbuf,
 426                                 unsigned int switch_timer_interval,
 427                                 unsigned int read_timer_interval);
 428         void (*channel_destroy)(struct channel *chan);
 429         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 430         int (*buffer_has_read_closed_stream)(struct channel *chan);
 431         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 432         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 433                              uint32_t event_id);
 434         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 435         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 436                             size_t len);
 437         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 438                                       const void *src, size_t len);
 439         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 440                              int c, size_t len);
 441         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 442                              size_t len);
 443         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 444                                        const char __user *src, size_t len);
 445         /*
 446          * packet_avail_size returns the available size in the current
 447          * packet. Note that the size returned is only a hint, since it
 448          * may change due to concurrent writes.
 449          */
 450         size_t (*packet_avail_size)(struct channel *chan);
 451         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 452         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 453         int (*is_finalized)(struct channel *chan);
 454         int (*is_disabled)(struct channel *chan);
 455         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 456                         struct lib_ring_buffer *bufb,
 457                         uint64_t *timestamp_begin);
 458         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 459                         struct lib_ring_buffer *bufb,
 460                         uint64_t *timestamp_end);
 461         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 462                         struct lib_ring_buffer *bufb,
 463                         uint64_t *events_discarded);
 464         int (*content_size) (const struct lib_ring_buffer_config *config,
 465                         struct lib_ring_buffer *bufb,
 466                         uint64_t *content_size);
 467         int (*packet_size) (const struct lib_ring_buffer_config *config,
 468                         struct lib_ring_buffer *bufb,
 469                         uint64_t *packet_size);
 470         int (*stream_id) (const struct lib_ring_buffer_config *config,
 471                         struct lib_ring_buffer *bufb,
 472                         uint64_t *stream_id);
 473         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 474                         struct lib_ring_buffer *bufb,
 475                         uint64_t *ts);
 476         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 477                         struct lib_ring_buffer *bufb,
 478                         uint64_t *seq);
 479         int (*instance_id) (const struct lib_ring_buffer_config *config,
 480                         struct lib_ring_buffer *bufb,
 481                         uint64_t *id);
 482 };
 483
 484 struct lttng_transport {
 485         char *name;
 486         struct module *owner;
 487         struct list_head node;
 488         struct lttng_channel_ops ops;
 489 };
 490
 491 struct lttng_syscall_filter;
 492
 493 #define LTTNG_EVENT_HT_BITS             12
 494 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 495
 496 struct lttng_event_ht {
 497         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 498 };
 499
 500 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 501 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 502
 503 struct lttng_event_notifier_ht {
 504         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 505 };
 506
 507 struct lttng_channel {
 508         unsigned int id;
 509         struct channel *chan;           /* Channel buffers */
 510         int enabled;
 511         struct lttng_ctx *ctx;
 512         /* Event ID management */
 513         struct lttng_session *session;
 514         struct file *file;              /* File associated to channel */
 515         unsigned int free_event_id;     /* Next event ID to allocate */
 516         struct list_head list;          /* Channel list */
 517         struct lttng_channel_ops *ops;
 518         struct lttng_transport *transport;
 519         struct lttng_event **sc_table;  /* for syscall tracing */
 520         struct lttng_event **compat_sc_table;
 521         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 522         struct lttng_event **compat_sc_exit_table;
 523         struct lttng_event *sc_unknown; /* for unknown syscalls */
 524         struct lttng_event *sc_compat_unknown;
 525         struct lttng_event *sc_exit_unknown;
 526         struct lttng_event *compat_sc_exit_unknown;
 527         struct lttng_syscall_filter *sc_filter;
 528         int header_type;                /* 0: unset, 1: compact, 2: large */
 529         enum channel_type channel_type;
 530         int syscall_all;
 531         unsigned int metadata_dumped:1,
 532                 sys_enter_registered:1,
 533                 sys_exit_registered:1,
 534                 tstate:1;               /* Transient enable state */
 535 };
 536
 537 struct lttng_metadata_stream {
 538         void *priv;                     /* Ring buffer private data */
 539         struct lttng_metadata_cache *metadata_cache;
 540         unsigned int metadata_in;       /* Bytes read from the cache */
 541         unsigned int metadata_out;      /* Bytes consumed from stream */
 542         int finalized;                  /* Has channel been finalized */
 543         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 544         struct list_head list;          /* Stream list */
 545         struct lttng_transport *transport;
 546         uint64_t version;               /* Current version of the metadata cache */
 547         bool coherent;                  /* Stream in a coherent state */
 548 };
 549
 550 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 551
 552 struct lttng_dynamic_len_stack {
 553         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 554         size_t offset;
 555 };
 556
 557 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 558
 559 /*
 560  * struct lttng_id_tracker declared in header due to deferencing of *v
 561  * in RCU_INITIALIZER(v).
 562  */
 563 #define LTTNG_ID_HASH_BITS      6
 564 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 565
 566 enum tracker_type {
 567         TRACKER_PID,
 568         TRACKER_VPID,
 569         TRACKER_UID,
 570         TRACKER_VUID,
 571         TRACKER_GID,
 572         TRACKER_VGID,
 573
 574         TRACKER_UNKNOWN,
 575 };
 576
 577 struct lttng_id_tracker_rcu {
 578         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 579 };
 580
 581 struct lttng_id_tracker {
 582         struct lttng_session *session;
 583         enum tracker_type tracker_type;
 584         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 585 };
 586
 587 struct lttng_id_hash_node {
 588         struct hlist_node hlist;
 589         int id;
 590 };
 591
 592 struct lttng_session {
 593         int active;                     /* Is trace session active ? */
 594         int been_active;                /* Has trace session been active ? */
 595         struct file *file;              /* File associated to session */
 596         struct list_head chan;          /* Channel list head */
 597         struct list_head events;        /* Event list head */
 598         struct list_head list;          /* Session list */
 599         unsigned int free_chan_id;      /* Next chan ID to allocate */
 600         uuid_le uuid;                   /* Trace session unique ID */
 601         struct lttng_metadata_cache *metadata_cache;
 602         struct lttng_id_tracker pid_tracker;
 603         struct lttng_id_tracker vpid_tracker;
 604         struct lttng_id_tracker uid_tracker;
 605         struct lttng_id_tracker vuid_tracker;
 606         struct lttng_id_tracker gid_tracker;
 607         struct lttng_id_tracker vgid_tracker;
 608         unsigned int metadata_dumped:1,
 609                 tstate:1;               /* Transient enable state */
 610         /* List of event enablers */
 611         struct list_head enablers_head;
 612         /* Hash table of events */
 613         struct lttng_event_ht events_ht;
 614         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 615         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 616 };
 617
 618 struct lttng_event_notifier_group {
 619         struct file *file;              /* File associated to event notifier group */
 620         struct file *notif_file;        /* File used to expose notifications to userspace. */
 621         struct list_head node;          /* event notifier group list */
 622         struct list_head enablers_head; /* List of enablers */
 623         struct list_head event_notifiers_head; /* List of event notifier */
 624         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 625         struct lttng_ctx *ctx;          /* Contexts for filters. */
 626         struct lttng_channel_ops *ops;
 627         struct lttng_transport *transport;
 628         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 629         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 630         wait_queue_head_t read_wait;
 631         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 632 };
 633
 634 struct lttng_metadata_cache {
 635         char *data;                     /* Metadata cache */
 636         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 637         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 638         atomic_t producing;             /* Metadata being produced (incomplete) */
 639         struct kref refcount;           /* Metadata cache usage */
 640         struct list_head metadata_stream;       /* Metadata stream list */
 641         uuid_le uuid;                   /* Trace session unique ID (copy) */
 642         struct mutex lock;              /* Produce/consume lock */
 643         uint64_t version;               /* Current version of the metadata */
 644 };
 645
 646 void lttng_lock_sessions(void);
 647 void lttng_unlock_sessions(void);
 648
 649 struct list_head *lttng_get_probe_list_head(void);
 650
 651 struct lttng_event_enabler *lttng_event_enabler_create(
 652                 enum lttng_enabler_format_type format_type,
 653                 struct lttng_kernel_event *event_param,
 654                 struct lttng_channel *chan);
 655
 656 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 657 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 658 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 659                 struct lttng_event_notifier_group *event_notifier_group,
 660                 enum lttng_enabler_format_type format_type,
 661                 struct lttng_kernel_event_notifier *event_notifier_param);
 662
 663 int lttng_event_notifier_enabler_enable(
 664                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 665 int lttng_event_notifier_enabler_disable(
 666                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 667 int lttng_fix_pending_events(void);
 668 int lttng_fix_pending_event_notifiers(void);
 669 int lttng_session_active(void);
 670 bool lttng_event_notifier_active(void);
 671
 672 struct lttng_session *lttng_session_create(void);
 673 int lttng_session_enable(struct lttng_session *session);
 674 int lttng_session_disable(struct lttng_session *session);
 675 void lttng_session_destroy(struct lttng_session *session);
 676 int lttng_session_metadata_regenerate(struct lttng_session *session);
 677 int lttng_session_statedump(struct lttng_session *session);
 678 void metadata_cache_destroy(struct kref *kref);
 679
 680 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 681 void lttng_event_notifier_group_destroy(
 682                 struct lttng_event_notifier_group *event_notifier_group);
 683
 684 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 685                                        const char *transport_name,
 686                                        void *buf_addr,
 687                                        size_t subbuf_size, size_t num_subbuf,
 688                                        unsigned int switch_timer_interval,
 689                                        unsigned int read_timer_interval,
 690                                        enum channel_type channel_type);
 691 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 692                                        int overwrite, void *buf_addr,
 693                                        size_t subbuf_size, size_t num_subbuf,
 694                                        unsigned int switch_timer_interval,
 695                                        unsigned int read_timer_interval);
 696
 697 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 698 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 699                                 struct lttng_kernel_event *event_param,
 700                                 void *filter,
 701                                 const struct lttng_event_desc *event_desc,
 702                                 enum lttng_kernel_instrumentation itype);
 703 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 704                                 struct lttng_kernel_event *event_param,
 705                                 void *filter,
 706                                 const struct lttng_event_desc *event_desc,
 707                                 enum lttng_kernel_instrumentation itype);
 708 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 709                 struct lttng_kernel_old_event *old_event_param,
 710                 void *filter,
 711                 const struct lttng_event_desc *internal_desc);
 712
 713 struct lttng_event_notifier *lttng_event_notifier_create(
 714                                 const struct lttng_event_desc *event_notifier_desc,
 715                                 uint64_t id,
 716                                 struct lttng_event_notifier_group *event_notifier_group,
 717                                 struct lttng_kernel_event_notifier *event_notifier_param,
 718                                 void *filter,
 719                                 enum lttng_kernel_instrumentation itype);
 720 struct lttng_event_notifier *_lttng_event_notifier_create(
 721                                 const struct lttng_event_desc *event_notifier_desc,
 722                                 uint64_t id,
 723                                 struct lttng_event_notifier_group *event_notifier_group,
 724                                 struct lttng_kernel_event_notifier *event_notifier_param,
 725                                 void *filter,
 726                                 enum lttng_kernel_instrumentation itype);
 727
 728 int lttng_channel_enable(struct lttng_channel *channel);
 729 int lttng_channel_disable(struct lttng_channel *channel);
 730 int lttng_event_enable(struct lttng_event *event);
 731 int lttng_event_disable(struct lttng_event *event);
 732
 733 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 734 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 735
 736 void lttng_transport_register(struct lttng_transport *transport);
 737 void lttng_transport_unregister(struct lttng_transport *transport);
 738
 739 void synchronize_trace(void);
 740 int lttng_abi_init(void);
 741 int lttng_abi_compat_old_init(void);
 742 void lttng_abi_exit(void);
 743 void lttng_abi_compat_old_exit(void);
 744
 745 int lttng_probe_register(struct lttng_probe_desc *desc);
 746 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 747 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 748 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 749 int lttng_probes_init(void);
 750 void lttng_probes_exit(void);
 751
 752 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 753                 struct channel *chan, bool *coherent);
 754
 755 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 756 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 757 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 758 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 759 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 760 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 761
 762 int lttng_session_track_id(struct lttng_session *session,
 763                 enum tracker_type tracker_type, int id);
 764 int lttng_session_untrack_id(struct lttng_session *session,
 765                 enum tracker_type tracker_type, int id);
 766
 767 int lttng_session_list_tracker_ids(struct lttng_session *session,
 768                 enum tracker_type tracker_type);
 769
 770 void lttng_clock_ref(void);
 771 void lttng_clock_unref(void);
 772
 773 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 774 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 775 int lttng_syscalls_unregister(struct lttng_channel *chan);
 776 int lttng_syscalls_destroy(struct lttng_channel *chan);
 777 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 778                 struct lttng_event *event);
 779 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 780                 struct lttng_event *event);
 781 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 782                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 783 #else
 784 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 785 {
 786         return -ENOSYS;
 787 }
 788
 789 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 790 {
 791         return 0;
 792 }
 793
 794 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 795 {
 796         return 0;
 797 }
 798
 799 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 800                 struct lttng_event *event);
 801 {
 802         return -ENOSYS;
 803 }
 804
 805 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 806                 struct lttng_event *event);
 807 {
 808         return -ENOSYS;
 809 }
 810
 811 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 812                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 813 {
 814         return -ENOSYS;
 815 }
 816
 817 #endif
 818
 819 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 820 int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler,
 821                 struct lttng_kernel_filter_bytecode __user *bytecode);
 822 int lttng_event_notifier_enabler_attach_bytecode(
 823                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 824                 struct lttng_kernel_filter_bytecode __user *bytecode);
 825
 826 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 827                 struct lttng_ctx *ctx,
 828                 struct list_head *bytecode_runtime_head,
 829                 struct lttng_enabler *enabler);
 830
 831 int lttng_probes_init(void);
 832
 833 extern struct lttng_ctx *lttng_static_ctx;
 834
 835 int lttng_context_init(void);
 836 void lttng_context_exit(void);
 837 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 838 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 839 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 840                 size_t index);
 841 void lttng_context_update(struct lttng_ctx *ctx);
 842 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 843 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 844 void lttng_remove_context_field(struct lttng_ctx **ctx,
 845                                 struct lttng_ctx_field *field);
 846 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 847 void lttng_destroy_context(struct lttng_ctx *ctx);
 848 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 849 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 850 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 851 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 852 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 853 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 854 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 855 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 856 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 857 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 858 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 859 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 860 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 861 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 862 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 863 #else
 864 static inline
 865 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 866 {
 867         return -ENOSYS;
 868 }
 869 #endif
 870 #ifdef CONFIG_PREEMPT_RT_FULL
 871 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 872 #else
 873 static inline
 874 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 875 {
 876         return -ENOSYS;
 877 }
 878 #endif
 879
 880 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 881
 882 #if defined(CONFIG_CGROUPS) && \
 883         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 884          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 885 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 886 #else
 887 static inline
 888 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 889 {
 890         return -ENOSYS;
 891 }
 892 #endif
 893
 894 #if defined(CONFIG_IPC_NS) && \
 895         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 896 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 897 #else
 898 static inline
 899 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 900 {
 901         return -ENOSYS;
 902 }
 903 #endif
 904
 905 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 906         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 907 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 908 #else
 909 static inline
 910 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 911 {
 912         return -ENOSYS;
 913 }
 914 #endif
 915
 916 #if defined(CONFIG_NET_NS) && \
 917         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 918 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 919 #else
 920 static inline
 921 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
 922 {
 923         return -ENOSYS;
 924 }
 925 #endif
 926
 927 #if defined(CONFIG_PID_NS) && \
 928         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 929 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 930 #else
 931 static inline
 932 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
 933 {
 934         return -ENOSYS;
 935 }
 936 #endif
 937
 938 #if defined(CONFIG_USER_NS) && \
 939         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 940 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 941 #else
 942 static inline
 943 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
 944 {
 945         return -ENOSYS;
 946 }
 947 #endif
 948
 949 #if defined(CONFIG_UTS_NS) && \
 950         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 951 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 952 #else
 953 static inline
 954 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
 955 {
 956         return -ENOSYS;
 957 }
 958 #endif
 959
 960 #if defined(CONFIG_TIME_NS) && \
 961         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
 962 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
 963 #else
 964 static inline
 965 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
 966 {
 967         return -ENOSYS;
 968 }
 969 #endif
 970
 971 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
 972 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
 973 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
 974 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
 975 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
 976 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
 977 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
 978 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
 979 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
 980 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
 981 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
 982 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
 983
 984 #if defined(CONFIG_PERF_EVENTS)
 985 int lttng_add_perf_counter_to_ctx(uint32_t type,
 986                                   uint64_t config,
 987                                   const char *name,
 988                                   struct lttng_ctx **ctx);
 989 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 990                 struct lttng_cpuhp_node *node);
 991 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 992                 struct lttng_cpuhp_node *node);
 993 #else
 994 static inline
 995 int lttng_add_perf_counter_to_ctx(uint32_t type,
 996                                   uint64_t config,
 997                                   const char *name,
 998                                   struct lttng_ctx **ctx)
 999 {
1000         return -ENOSYS;
1001 }
1002 static inline
1003 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1004                 struct lttng_cpuhp_node *node)
1005 {
1006         return 0;
1007 }
1008 static inline
1009 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1010                 struct lttng_cpuhp_node *node)
1011 {
1012         return 0;
1013 }
1014 #endif
1015
1016 int lttng_logger_init(void);
1017 void lttng_logger_exit(void);
1018
1019 extern int lttng_statedump_start(struct lttng_session *session);
1020
1021 #ifdef CONFIG_KPROBES
1022 int lttng_kprobes_register_event(const char *name,
1023                 const char *symbol_name,
1024                 uint64_t offset,
1025                 uint64_t addr,
1026                 struct lttng_event *event);
1027 void lttng_kprobes_unregister_event(struct lttng_event *event);
1028 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1029 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1030                 uint64_t offset,
1031                 uint64_t addr,
1032                 struct lttng_event_notifier *event_notifier);
1033 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1034 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1035 #else
1036 static inline
1037 int lttng_kprobes_register_event(const char *name,
1038                 const char *symbol_name,
1039                 uint64_t offset,
1040                 uint64_t addr,
1041                 struct lttng_event *event)
1042 {
1043         return -ENOSYS;
1044 }
1045
1046 static inline
1047 void lttng_kprobes_unregister_event(struct lttng_event *event)
1048 {
1049 }
1050
1051 static inline
1052 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1053 {
1054 }
1055
1056 static inline
1057 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1058                 uint64_t offset,
1059                 uint64_t addr,
1060                 struct lttng_event_notifier *event_notifier)
1061 {
1062         return -ENOSYS;
1063 }
1064
1065 static inline
1066 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1067 {
1068 }
1069
1070 static inline
1071 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1072 {
1073 }
1074 #endif
1075
1076 int lttng_event_add_callsite(struct lttng_event *event,
1077         struct lttng_kernel_event_callsite *callsite);
1078
1079 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1080         struct lttng_kernel_event_callsite *callsite);
1081
1082 #ifdef CONFIG_UPROBES
1083 int lttng_uprobes_register_event(const char *name,
1084         int fd, struct lttng_event *event);
1085 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1086         struct lttng_kernel_event_callsite *callsite);
1087 void lttng_uprobes_unregister_event(struct lttng_event *event);
1088 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1089 int lttng_uprobes_register_event_notifier(const char *name,
1090         int fd, struct lttng_event_notifier *event_notifier);
1091 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1092         struct lttng_kernel_event_callsite *callsite);
1093 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1094 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1095 #else
1096 static inline
1097 int lttng_uprobes_register_event(const char *name,
1098         int fd, struct lttng_event *event)
1099 {
1100         return -ENOSYS;
1101 }
1102
1103 static inline
1104 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1105         struct lttng_kernel_event_callsite *callsite)
1106 {
1107         return -ENOSYS;
1108 }
1109
1110 static inline
1111 void lttng_uprobes_unregister_event(struct lttng_event *event)
1112 {
1113 }
1114
1115 static inline
1116 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1117 {
1118 }
1119
1120 static inline
1121 int lttng_uprobes_register_event_notifier(const char *name,
1122         int fd, struct lttng_event_notifier *event_notifier)
1123 {
1124         return -ENOSYS;
1125 }
1126
1127 static inline
1128 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1129         struct lttng_kernel_event_callsite *callsite)
1130 {
1131         return -ENOSYS;
1132 }
1133
1134 static inline
1135 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1136 {
1137 }
1138
1139 static inline
1140 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1141 {
1142 }
1143 #endif
1144
1145 #ifdef CONFIG_KRETPROBES
1146 int lttng_kretprobes_register(const char *name,
1147                 const char *symbol_name,
1148                 uint64_t offset,
1149                 uint64_t addr,
1150                 struct lttng_event *event_entry,
1151                 struct lttng_event *event_exit);
1152 void lttng_kretprobes_unregister(struct lttng_event *event);
1153 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1154 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1155         int enable);
1156 #else
1157 static inline
1158 int lttng_kretprobes_register(const char *name,
1159                 const char *symbol_name,
1160                 uint64_t offset,
1161                 uint64_t addr,
1162                 struct lttng_event *event_entry,
1163                 struct lttng_event *event_exit)
1164 {
1165         return -ENOSYS;
1166 }
1167
1168 static inline
1169 void lttng_kretprobes_unregister(struct lttng_event *event)
1170 {
1171 }
1172
1173 static inline
1174 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1175 {
1176 }
1177
1178 static inline
1179 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1180         int enable)
1181 {
1182         return -ENOSYS;
1183 }
1184 #endif
1185
1186 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1187
1188 extern const struct file_operations lttng_tracepoint_list_fops;
1189 extern const struct file_operations lttng_syscall_list_fops;
1190
1191 #define TRACEPOINT_HAS_DATA_ARG
1192
1193 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1194 {
1195         if (type->atype != atype_integer)
1196                 return false;
1197         switch (type->u.integer.size) {
1198         case 8:         /* Fall-through. */
1199         case 16:        /* Fall-through. */
1200         case 32:        /* Fall-through. */
1201         case 64:
1202                 break;
1203         default:
1204                 return false;
1205         }
1206         return true;
1207 }
1208
1209 #endif /* _LTTNG_EVENTS_H */