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 enum lttng_bytecode_node_type {
 236         LTTNG_BYTECODE_NODE_TYPE_FILTER,
 237 };
 238
 239 struct lttng_bytecode_node {
 240         enum lttng_bytecode_node_type type;
 241         struct list_head node;
 242         struct lttng_enabler *enabler;
 243         struct {
 244                 uint32_t len;
 245                 uint32_t reloc_offset;
 246                 uint64_t seqnum;
 247                 char data[];
 248         } bc;
 249 };
 250
 251 /*
 252  * Bytecode interpreter return value masks.
 253  */
 254 enum lttng_bytecode_interpreter_ret {
 255         LTTNG_INTERPRETER_DISCARD = 0,
 256         LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
 257         /* Other bits are kept for future use. */
 258 };
 259
 260 struct lttng_bytecode_runtime {
 261         /* Associated bytecode */
 262         struct lttng_bytecode_node *bc;
 263         union {
 264                 uint64_t (*filter)(void *filter_data,
 265                                 struct lttng_probe_ctx *lttng_probe_ctx,
 266                                 const char *filter_stack_data);
 267         } interpreter_funcs;
 268         int link_failed;
 269         struct list_head node;  /* list of bytecode runtime in event */
 270         struct lttng_ctx *ctx;
 271 };
 272
 273 /*
 274  * Objects in a linked-list of enablers, owned by an event.
 275  */
 276 struct lttng_enabler_ref {
 277         struct list_head node;                  /* enabler ref list */
 278         struct lttng_enabler *ref;              /* backward ref */
 279 };
 280
 281 struct lttng_uprobe_handler {
 282         union {
 283                 struct lttng_event *event;
 284                 struct lttng_event_notifier *event_notifier;
 285         } u;
 286         loff_t offset;
 287         struct uprobe_consumer up_consumer;
 288         struct list_head node;
 289 };
 290
 291 struct lttng_kprobe {
 292         struct kprobe kp;
 293         char *symbol_name;
 294 };
 295
 296 struct lttng_uprobe {
 297         struct inode *inode;
 298         struct list_head head;
 299 };
 300
 301 enum lttng_syscall_entryexit {
 302         LTTNG_SYSCALL_ENTRY,
 303         LTTNG_SYSCALL_EXIT,
 304 };
 305
 306 enum lttng_syscall_abi {
 307         LTTNG_SYSCALL_ABI_NATIVE,
 308         LTTNG_SYSCALL_ABI_COMPAT,
 309 };
 310
 311 /*
 312  * lttng_event structure is referred to by the tracing fast path. It must be
 313  * kept small.
 314  */
 315 struct lttng_event {
 316         enum lttng_event_type evtype;   /* First field. */
 317         unsigned int id;
 318         struct lttng_channel *chan;
 319         int enabled;
 320         const struct lttng_event_desc *desc;
 321         void *filter;
 322         struct lttng_ctx *ctx;
 323         enum lttng_kernel_instrumentation instrumentation;
 324         union {
 325                 struct lttng_kprobe kprobe;
 326                 struct {
 327                         struct lttng_krp *lttng_krp;
 328                         char *symbol_name;
 329                 } kretprobe;
 330                 struct lttng_uprobe uprobe;
 331                 struct {
 332                         enum lttng_syscall_entryexit entryexit;
 333                         enum lttng_syscall_abi abi;
 334                 } syscall;
 335         } u;
 336         struct list_head list;          /* Event list in session */
 337         unsigned int metadata_dumped:1;
 338
 339         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 340         struct list_head enablers_ref_head;
 341         struct hlist_node hlist;        /* session ht of events */
 342         int registered;                 /* has reg'd tracepoint probe */
 343         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 344         struct list_head filter_bytecode_runtime_head;
 345         int has_enablers_without_bytecode;
 346 };
 347
 348 // FIXME: Really similar to lttng_event above. Could those be merged ?
 349 struct lttng_event_notifier {
 350         enum lttng_event_type evtype;   /* First field. */
 351         uint64_t user_token;
 352         int enabled;
 353         int registered;                 /* has reg'd tracepoint probe */
 354         const struct lttng_event_desc *desc;
 355         void *filter;
 356         struct list_head list;          /* event_notifier list in event_notifier group */
 357
 358         enum lttng_kernel_instrumentation instrumentation;
 359         union {
 360                 struct lttng_kprobe kprobe;
 361                 struct lttng_uprobe uprobe;
 362                 struct {
 363                         enum lttng_syscall_entryexit entryexit;
 364                         enum lttng_syscall_abi abi;
 365                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 366                         unsigned int syscall_id;
 367                 } syscall;
 368
 369         } u;
 370
 371         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 372         struct list_head enablers_ref_head;
 373         struct hlist_node hlist;        /* session ht of event_notifiers */
 374         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 375         struct list_head filter_bytecode_runtime_head;
 376         int has_enablers_without_bytecode;
 377
 378         void (*send_notification)(struct lttng_event_notifier *event_notifier);
 379         struct lttng_event_notifier_group *group; /* Weak ref */
 380 };
 381
 382 enum lttng_enabler_format_type {
 383         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 384         LTTNG_ENABLER_FORMAT_NAME,
 385 };
 386
 387 /*
 388  * Enabler field, within whatever object is enabling an event. Target of
 389  * backward reference.
 390  */
 391 struct lttng_enabler {
 392         enum lttng_event_type evtype;   /* First field. */
 393
 394         enum lttng_enabler_format_type format_type;
 395
 396         /* head list of struct lttng_ust_filter_bytecode_node */
 397         struct list_head filter_bytecode_head;
 398
 399         struct lttng_kernel_event event_param;
 400         unsigned int enabled:1;
 401
 402         uint64_t user_token;            /* User-provided token. */
 403 };
 404
 405 struct lttng_event_enabler {
 406         struct lttng_enabler base;
 407         struct list_head node;  /* per-session list of enablers */
 408         struct lttng_channel *chan;
 409         /*
 410          * Unused, but kept around to make it explicit that the tracer can do
 411          * it.
 412          */
 413         struct lttng_ctx *ctx;
 414 };
 415
 416 struct lttng_event_notifier_enabler {
 417         struct lttng_enabler base;
 418         struct list_head node;  /* List of event_notifier enablers */
 419         struct lttng_event_notifier_group *group;
 420 };
 421
 422 static inline
 423 struct lttng_enabler *lttng_event_enabler_as_enabler(
 424                 struct lttng_event_enabler *event_enabler)
 425 {
 426         return &event_enabler->base;
 427 }
 428
 429 static inline
 430 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 431                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 432 {
 433         return &event_notifier_enabler->base;
 434 }
 435
 436 struct lttng_channel_ops {
 437         struct channel *(*channel_create)(const char *name,
 438                                 void *priv,
 439                                 void *buf_addr,
 440                                 size_t subbuf_size, size_t num_subbuf,
 441                                 unsigned int switch_timer_interval,
 442                                 unsigned int read_timer_interval);
 443         void (*channel_destroy)(struct channel *chan);
 444         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 445         int (*buffer_has_read_closed_stream)(struct channel *chan);
 446         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 447         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 448                              uint32_t event_id);
 449         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 450         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 451                             size_t len);
 452         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 453                                       const void *src, size_t len);
 454         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 455                              int c, size_t len);
 456         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 457                              size_t len);
 458         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 459                                        const char __user *src, size_t len);
 460         /*
 461          * packet_avail_size returns the available size in the current
 462          * packet. Note that the size returned is only a hint, since it
 463          * may change due to concurrent writes.
 464          */
 465         size_t (*packet_avail_size)(struct channel *chan);
 466         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 467         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 468         int (*is_finalized)(struct channel *chan);
 469         int (*is_disabled)(struct channel *chan);
 470         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 471                         struct lib_ring_buffer *bufb,
 472                         uint64_t *timestamp_begin);
 473         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 474                         struct lib_ring_buffer *bufb,
 475                         uint64_t *timestamp_end);
 476         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 477                         struct lib_ring_buffer *bufb,
 478                         uint64_t *events_discarded);
 479         int (*content_size) (const struct lib_ring_buffer_config *config,
 480                         struct lib_ring_buffer *bufb,
 481                         uint64_t *content_size);
 482         int (*packet_size) (const struct lib_ring_buffer_config *config,
 483                         struct lib_ring_buffer *bufb,
 484                         uint64_t *packet_size);
 485         int (*stream_id) (const struct lib_ring_buffer_config *config,
 486                         struct lib_ring_buffer *bufb,
 487                         uint64_t *stream_id);
 488         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 489                         struct lib_ring_buffer *bufb,
 490                         uint64_t *ts);
 491         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 492                         struct lib_ring_buffer *bufb,
 493                         uint64_t *seq);
 494         int (*instance_id) (const struct lib_ring_buffer_config *config,
 495                         struct lib_ring_buffer *bufb,
 496                         uint64_t *id);
 497 };
 498
 499 struct lttng_transport {
 500         char *name;
 501         struct module *owner;
 502         struct list_head node;
 503         struct lttng_channel_ops ops;
 504 };
 505
 506 struct lttng_syscall_filter;
 507
 508 #define LTTNG_EVENT_HT_BITS             12
 509 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 510
 511 struct lttng_event_ht {
 512         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 513 };
 514
 515 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 516 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 517
 518 struct lttng_event_notifier_ht {
 519         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 520 };
 521
 522 struct lttng_channel {
 523         unsigned int id;
 524         struct channel *chan;           /* Channel buffers */
 525         int enabled;
 526         struct lttng_ctx *ctx;
 527         /* Event ID management */
 528         struct lttng_session *session;
 529         struct file *file;              /* File associated to channel */
 530         unsigned int free_event_id;     /* Next event ID to allocate */
 531         struct list_head list;          /* Channel list */
 532         struct lttng_channel_ops *ops;
 533         struct lttng_transport *transport;
 534         struct lttng_event **sc_table;  /* for syscall tracing */
 535         struct lttng_event **compat_sc_table;
 536         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 537         struct lttng_event **compat_sc_exit_table;
 538         struct lttng_event *sc_unknown; /* for unknown syscalls */
 539         struct lttng_event *sc_compat_unknown;
 540         struct lttng_event *sc_exit_unknown;
 541         struct lttng_event *compat_sc_exit_unknown;
 542         struct lttng_syscall_filter *sc_filter;
 543         int header_type;                /* 0: unset, 1: compact, 2: large */
 544         enum channel_type channel_type;
 545         int syscall_all;
 546         unsigned int metadata_dumped:1,
 547                 sys_enter_registered:1,
 548                 sys_exit_registered:1,
 549                 tstate:1;               /* Transient enable state */
 550 };
 551
 552 struct lttng_metadata_stream {
 553         void *priv;                     /* Ring buffer private data */
 554         struct lttng_metadata_cache *metadata_cache;
 555         unsigned int metadata_in;       /* Bytes read from the cache */
 556         unsigned int metadata_out;      /* Bytes consumed from stream */
 557         int finalized;                  /* Has channel been finalized */
 558         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 559         struct list_head list;          /* Stream list */
 560         struct lttng_transport *transport;
 561         uint64_t version;               /* Current version of the metadata cache */
 562         bool coherent;                  /* Stream in a coherent state */
 563 };
 564
 565 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 566
 567 struct lttng_dynamic_len_stack {
 568         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 569         size_t offset;
 570 };
 571
 572 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 573
 574 /*
 575  * struct lttng_id_tracker declared in header due to deferencing of *v
 576  * in RCU_INITIALIZER(v).
 577  */
 578 #define LTTNG_ID_HASH_BITS      6
 579 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 580
 581 enum tracker_type {
 582         TRACKER_PID,
 583         TRACKER_VPID,
 584         TRACKER_UID,
 585         TRACKER_VUID,
 586         TRACKER_GID,
 587         TRACKER_VGID,
 588
 589         TRACKER_UNKNOWN,
 590 };
 591
 592 struct lttng_id_tracker_rcu {
 593         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 594 };
 595
 596 struct lttng_id_tracker {
 597         struct lttng_session *session;
 598         enum tracker_type tracker_type;
 599         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 600 };
 601
 602 struct lttng_id_hash_node {
 603         struct hlist_node hlist;
 604         int id;
 605 };
 606
 607 struct lttng_session {
 608         int active;                     /* Is trace session active ? */
 609         int been_active;                /* Has trace session been active ? */
 610         struct file *file;              /* File associated to session */
 611         struct list_head chan;          /* Channel list head */
 612         struct list_head events;        /* Event list head */
 613         struct list_head list;          /* Session list */
 614         unsigned int free_chan_id;      /* Next chan ID to allocate */
 615         uuid_le uuid;                   /* Trace session unique ID */
 616         struct lttng_metadata_cache *metadata_cache;
 617         struct lttng_id_tracker pid_tracker;
 618         struct lttng_id_tracker vpid_tracker;
 619         struct lttng_id_tracker uid_tracker;
 620         struct lttng_id_tracker vuid_tracker;
 621         struct lttng_id_tracker gid_tracker;
 622         struct lttng_id_tracker vgid_tracker;
 623         unsigned int metadata_dumped:1,
 624                 tstate:1;               /* Transient enable state */
 625         /* List of event enablers */
 626         struct list_head enablers_head;
 627         /* Hash table of events */
 628         struct lttng_event_ht events_ht;
 629         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 630         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 631 };
 632
 633 struct lttng_event_notifier_group {
 634         struct file *file;              /* File associated to event notifier group */
 635         struct file *notif_file;        /* File used to expose notifications to userspace. */
 636         struct list_head node;          /* event notifier group list */
 637         struct list_head enablers_head; /* List of enablers */
 638         struct list_head event_notifiers_head; /* List of event notifier */
 639         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 640         struct lttng_ctx *ctx;          /* Contexts for filters. */
 641         struct lttng_channel_ops *ops;
 642         struct lttng_transport *transport;
 643         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 644         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 645         wait_queue_head_t read_wait;
 646         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 647         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 648         struct lttng_event_notifier *sc_compat_unknown;
 649
 650         struct lttng_syscall_filter *sc_filter;
 651
 652         struct hlist_head *event_notifier_syscall_dispatch;
 653         struct hlist_head *event_notifier_compat_syscall_dispatch;
 654         struct hlist_head *event_notifier_exit_syscall_dispatch;
 655         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 656
 657         struct hlist_head event_notifier_unknown_syscall_dispatch;
 658         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 659         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 660         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 661
 662         int syscall_all_entry;
 663         int syscall_all_exit;
 664
 665         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 666
 667         struct lttng_counter *error_counter;
 668         size_t error_counter_len;
 669 };
 670
 671 struct lttng_metadata_cache {
 672         char *data;                     /* Metadata cache */
 673         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 674         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 675         atomic_t producing;             /* Metadata being produced (incomplete) */
 676         struct kref refcount;           /* Metadata cache usage */
 677         struct list_head metadata_stream;       /* Metadata stream list */
 678         uuid_le uuid;                   /* Trace session unique ID (copy) */
 679         struct mutex lock;              /* Produce/consume lock */
 680         uint64_t version;               /* Current version of the metadata */
 681 };
 682
 683 void lttng_lock_sessions(void);
 684 void lttng_unlock_sessions(void);
 685
 686 struct list_head *lttng_get_probe_list_head(void);
 687
 688 struct lttng_event_enabler *lttng_event_enabler_create(
 689                 enum lttng_enabler_format_type format_type,
 690                 struct lttng_kernel_event *event_param,
 691                 struct lttng_channel *chan);
 692
 693 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 694 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 695 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 696                 struct lttng_event_notifier_group *event_notifier_group,
 697                 enum lttng_enabler_format_type format_type,
 698                 struct lttng_kernel_event_notifier *event_notifier_param);
 699
 700 int lttng_event_notifier_enabler_enable(
 701                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 702 int lttng_event_notifier_enabler_disable(
 703                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 704 int lttng_fix_pending_events(void);
 705 int lttng_fix_pending_event_notifiers(void);
 706 int lttng_session_active(void);
 707 bool lttng_event_notifier_active(void);
 708
 709 struct lttng_session *lttng_session_create(void);
 710 int lttng_session_enable(struct lttng_session *session);
 711 int lttng_session_disable(struct lttng_session *session);
 712 void lttng_session_destroy(struct lttng_session *session);
 713 int lttng_session_metadata_regenerate(struct lttng_session *session);
 714 int lttng_session_statedump(struct lttng_session *session);
 715 void metadata_cache_destroy(struct kref *kref);
 716
 717 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 718 void lttng_event_notifier_group_destroy(
 719                 struct lttng_event_notifier_group *event_notifier_group);
 720
 721 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 722                                        const char *transport_name,
 723                                        void *buf_addr,
 724                                        size_t subbuf_size, size_t num_subbuf,
 725                                        unsigned int switch_timer_interval,
 726                                        unsigned int read_timer_interval,
 727                                        enum channel_type channel_type);
 728 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 729                                        int overwrite, void *buf_addr,
 730                                        size_t subbuf_size, size_t num_subbuf,
 731                                        unsigned int switch_timer_interval,
 732                                        unsigned int read_timer_interval);
 733
 734 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 735 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 736                                 struct lttng_kernel_event *event_param,
 737                                 void *filter,
 738                                 const struct lttng_event_desc *event_desc,
 739                                 enum lttng_kernel_instrumentation itype);
 740 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 741                                 struct lttng_kernel_event *event_param,
 742                                 void *filter,
 743                                 const struct lttng_event_desc *event_desc,
 744                                 enum lttng_kernel_instrumentation itype);
 745 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 746                 struct lttng_kernel_old_event *old_event_param,
 747                 void *filter,
 748                 const struct lttng_event_desc *internal_desc);
 749
 750 struct lttng_event_notifier *lttng_event_notifier_create(
 751                                 const struct lttng_event_desc *event_notifier_desc,
 752                                 uint64_t id,
 753                                 struct lttng_event_notifier_group *event_notifier_group,
 754                                 struct lttng_kernel_event_notifier *event_notifier_param,
 755                                 void *filter,
 756                                 enum lttng_kernel_instrumentation itype);
 757 struct lttng_event_notifier *_lttng_event_notifier_create(
 758                                 const struct lttng_event_desc *event_notifier_desc,
 759                                 uint64_t id,
 760                                 struct lttng_event_notifier_group *event_notifier_group,
 761                                 struct lttng_kernel_event_notifier *event_notifier_param,
 762                                 void *filter,
 763                                 enum lttng_kernel_instrumentation itype);
 764
 765 int lttng_channel_enable(struct lttng_channel *channel);
 766 int lttng_channel_disable(struct lttng_channel *channel);
 767 int lttng_event_enable(struct lttng_event *event);
 768 int lttng_event_disable(struct lttng_event *event);
 769
 770 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 771 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 772
 773 void lttng_transport_register(struct lttng_transport *transport);
 774 void lttng_transport_unregister(struct lttng_transport *transport);
 775
 776 void synchronize_trace(void);
 777 int lttng_abi_init(void);
 778 int lttng_abi_compat_old_init(void);
 779 void lttng_abi_exit(void);
 780 void lttng_abi_compat_old_exit(void);
 781
 782 int lttng_probe_register(struct lttng_probe_desc *desc);
 783 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 784 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 785 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 786 int lttng_probes_init(void);
 787 void lttng_probes_exit(void);
 788
 789 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 790                 struct channel *chan, bool *coherent);
 791
 792 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 793 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 794 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 795 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 796 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 797 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 798
 799 int lttng_session_track_id(struct lttng_session *session,
 800                 enum tracker_type tracker_type, int id);
 801 int lttng_session_untrack_id(struct lttng_session *session,
 802                 enum tracker_type tracker_type, int id);
 803
 804 int lttng_session_list_tracker_ids(struct lttng_session *session,
 805                 enum tracker_type tracker_type);
 806
 807 void lttng_clock_ref(void);
 808 void lttng_clock_unref(void);
 809
 810 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 811                 struct lttng_enabler *enabler);
 812
 813 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 814 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 815 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 816 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 817 int lttng_syscall_filter_enable_event(
 818                 struct lttng_channel *chan,
 819                 struct lttng_event *event);
 820 int lttng_syscall_filter_disable_event(
 821                 struct lttng_channel *chan,
 822                 struct lttng_event *event);
 823
 824 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 825                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 826
 827 int lttng_syscalls_register_event_notifier(
 828                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 829                 void *filter);
 830 int lttng_syscals_create_matching_event_notifiers(
 831                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 832 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 833 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 834 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 835 #else
 836 static inline int lttng_syscalls_register_event(
 837                 struct lttng_channel *chan, void *filter)
 838 {
 839         return -ENOSYS;
 840 }
 841
 842 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 843 {
 844         return 0;
 845 }
 846
 847 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 848 {
 849         return 0;
 850 }
 851
 852 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 853                 struct lttng_event *event);
 854 {
 855         return -ENOSYS;
 856 }
 857
 858 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 859                 struct lttng_event *event);
 860 {
 861         return -ENOSYS;
 862 }
 863
 864 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 865                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 866 {
 867         return -ENOSYS;
 868 }
 869
 870 static inline int lttng_syscalls_register_event_notifier(
 871                 struct lttng_event_notifier_group *group, void *filter)
 872 {
 873         return -ENOSYS;
 874 }
 875
 876 static inline int lttng_syscalls_unregister_event_notifier(
 877                 struct lttng_event_notifier_group *group)
 878 {
 879         return 0;
 880 }
 881
 882 static inline int lttng_syscall_filter_enable_event_notifier(
 883                 struct lttng_event_notifier_group *group,
 884                 const char *name)
 885 {
 886         return -ENOSYS;
 887 }
 888
 889 static inline int lttng_syscall_filter_disable_event_notifier(
 890                 struct lttng_event_notifier_group *group,
 891                 const char *name)
 892 {
 893         return -ENOSYS;
 894 }
 895
 896 #endif
 897
 898 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 899                 struct lttng_kernel_filter_bytecode __user *bytecode);
 900 int lttng_event_notifier_enabler_attach_filter_bytecode(
 901                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 902                 struct lttng_kernel_filter_bytecode __user *bytecode);
 903
 904 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 905                 struct lttng_ctx *ctx,
 906                 struct list_head *instance_bytecode_runtime_head,
 907                 struct list_head *enabler_bytecode_runtime_head);
 908
 909 int lttng_probes_init(void);
 910
 911 extern struct lttng_ctx *lttng_static_ctx;
 912
 913 int lttng_context_init(void);
 914 void lttng_context_exit(void);
 915 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 916 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 917 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 918                 size_t index);
 919 void lttng_context_update(struct lttng_ctx *ctx);
 920 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 921 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 922 void lttng_remove_context_field(struct lttng_ctx **ctx,
 923                                 struct lttng_ctx_field *field);
 924 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 925 void lttng_destroy_context(struct lttng_ctx *ctx);
 926 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 927 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 928 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 929 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 930 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 931 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 932 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 933 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 934 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 935 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 936 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 937 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 938 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 939 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 940 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 941 #else
 942 static inline
 943 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 944 {
 945         return -ENOSYS;
 946 }
 947 #endif
 948 #ifdef CONFIG_PREEMPT_RT_FULL
 949 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 950 #else
 951 static inline
 952 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 953 {
 954         return -ENOSYS;
 955 }
 956 #endif
 957
 958 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 959
 960 #if defined(CONFIG_CGROUPS) && \
 961         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 962          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 963 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 964 #else
 965 static inline
 966 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 967 {
 968         return -ENOSYS;
 969 }
 970 #endif
 971
 972 #if defined(CONFIG_IPC_NS) && \
 973         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 974 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 975 #else
 976 static inline
 977 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 978 {
 979         return -ENOSYS;
 980 }
 981 #endif
 982
 983 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 984         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 985 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 986 #else
 987 static inline
 988 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 989 {
 990         return -ENOSYS;
 991 }
 992 #endif
 993
 994 #if defined(CONFIG_NET_NS) && \
 995         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 996 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 997 #else
 998 static inline
 999 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
1000 {
1001         return -ENOSYS;
1002 }
1003 #endif
1004
1005 #if defined(CONFIG_PID_NS) && \
1006         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1007 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1008 #else
1009 static inline
1010 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1011 {
1012         return -ENOSYS;
1013 }
1014 #endif
1015
1016 #if defined(CONFIG_USER_NS) && \
1017         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1018 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1019 #else
1020 static inline
1021 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1022 {
1023         return -ENOSYS;
1024 }
1025 #endif
1026
1027 #if defined(CONFIG_UTS_NS) && \
1028         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1029 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1030 #else
1031 static inline
1032 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1033 {
1034         return -ENOSYS;
1035 }
1036 #endif
1037
1038 #if defined(CONFIG_TIME_NS) && \
1039         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1040 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1041 #else
1042 static inline
1043 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1044 {
1045         return -ENOSYS;
1046 }
1047 #endif
1048
1049 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1050 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1051 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1052 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1053 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1054 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1055 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1056 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1057 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1058 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1059 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1060 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1061
1062 #if defined(CONFIG_PERF_EVENTS)
1063 int lttng_add_perf_counter_to_ctx(uint32_t type,
1064                                   uint64_t config,
1065                                   const char *name,
1066                                   struct lttng_ctx **ctx);
1067 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1068                 struct lttng_cpuhp_node *node);
1069 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1070                 struct lttng_cpuhp_node *node);
1071 #else
1072 static inline
1073 int lttng_add_perf_counter_to_ctx(uint32_t type,
1074                                   uint64_t config,
1075                                   const char *name,
1076                                   struct lttng_ctx **ctx)
1077 {
1078         return -ENOSYS;
1079 }
1080 static inline
1081 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1082                 struct lttng_cpuhp_node *node)
1083 {
1084         return 0;
1085 }
1086 static inline
1087 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1088                 struct lttng_cpuhp_node *node)
1089 {
1090         return 0;
1091 }
1092 #endif
1093
1094 int lttng_logger_init(void);
1095 void lttng_logger_exit(void);
1096
1097 extern int lttng_statedump_start(struct lttng_session *session);
1098
1099 #ifdef CONFIG_KPROBES
1100 int lttng_kprobes_register_event(const char *name,
1101                 const char *symbol_name,
1102                 uint64_t offset,
1103                 uint64_t addr,
1104                 struct lttng_event *event);
1105 void lttng_kprobes_unregister_event(struct lttng_event *event);
1106 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1107 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1108                 uint64_t offset,
1109                 uint64_t addr,
1110                 struct lttng_event_notifier *event_notifier);
1111 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1112 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1113 #else
1114 static inline
1115 int lttng_kprobes_register_event(const char *name,
1116                 const char *symbol_name,
1117                 uint64_t offset,
1118                 uint64_t addr,
1119                 struct lttng_event *event)
1120 {
1121         return -ENOSYS;
1122 }
1123
1124 static inline
1125 void lttng_kprobes_unregister_event(struct lttng_event *event)
1126 {
1127 }
1128
1129 static inline
1130 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1131 {
1132 }
1133
1134 static inline
1135 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1136                 uint64_t offset,
1137                 uint64_t addr,
1138                 struct lttng_event_notifier *event_notifier)
1139 {
1140         return -ENOSYS;
1141 }
1142
1143 static inline
1144 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1145 {
1146 }
1147
1148 static inline
1149 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1150 {
1151 }
1152 #endif
1153
1154 int lttng_event_add_callsite(struct lttng_event *event,
1155         struct lttng_kernel_event_callsite *callsite);
1156
1157 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1158         struct lttng_kernel_event_callsite *callsite);
1159
1160 #ifdef CONFIG_UPROBES
1161 int lttng_uprobes_register_event(const char *name,
1162         int fd, struct lttng_event *event);
1163 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1164         struct lttng_kernel_event_callsite *callsite);
1165 void lttng_uprobes_unregister_event(struct lttng_event *event);
1166 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1167 int lttng_uprobes_register_event_notifier(const char *name,
1168         int fd, struct lttng_event_notifier *event_notifier);
1169 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1170         struct lttng_kernel_event_callsite *callsite);
1171 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1172 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1173 #else
1174 static inline
1175 int lttng_uprobes_register_event(const char *name,
1176         int fd, struct lttng_event *event)
1177 {
1178         return -ENOSYS;
1179 }
1180
1181 static inline
1182 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1183         struct lttng_kernel_event_callsite *callsite)
1184 {
1185         return -ENOSYS;
1186 }
1187
1188 static inline
1189 void lttng_uprobes_unregister_event(struct lttng_event *event)
1190 {
1191 }
1192
1193 static inline
1194 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1195 {
1196 }
1197
1198 static inline
1199 int lttng_uprobes_register_event_notifier(const char *name,
1200         int fd, struct lttng_event_notifier *event_notifier)
1201 {
1202         return -ENOSYS;
1203 }
1204
1205 static inline
1206 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1207         struct lttng_kernel_event_callsite *callsite)
1208 {
1209         return -ENOSYS;
1210 }
1211
1212 static inline
1213 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1214 {
1215 }
1216
1217 static inline
1218 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1219 {
1220 }
1221 #endif
1222
1223 #ifdef CONFIG_KRETPROBES
1224 int lttng_kretprobes_register(const char *name,
1225                 const char *symbol_name,
1226                 uint64_t offset,
1227                 uint64_t addr,
1228                 struct lttng_event *event_entry,
1229                 struct lttng_event *event_exit);
1230 void lttng_kretprobes_unregister(struct lttng_event *event);
1231 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1232 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1233         int enable);
1234 #else
1235 static inline
1236 int lttng_kretprobes_register(const char *name,
1237                 const char *symbol_name,
1238                 uint64_t offset,
1239                 uint64_t addr,
1240                 struct lttng_event *event_entry,
1241                 struct lttng_event *event_exit)
1242 {
1243         return -ENOSYS;
1244 }
1245
1246 static inline
1247 void lttng_kretprobes_unregister(struct lttng_event *event)
1248 {
1249 }
1250
1251 static inline
1252 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1253 {
1254 }
1255
1256 static inline
1257 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1258         int enable)
1259 {
1260         return -ENOSYS;
1261 }
1262 #endif
1263
1264 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1265
1266 extern const struct file_operations lttng_tracepoint_list_fops;
1267 extern const struct file_operations lttng_syscall_list_fops;
1268
1269 #define TRACEPOINT_HAS_DATA_ARG
1270
1271 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1272 {
1273         if (type->atype != atype_integer)
1274                 return false;
1275         switch (type->u.integer.size) {
1276         case 8:         /* Fall-through. */
1277         case 16:        /* Fall-through. */
1278         case 32:        /* Fall-through. */
1279         case 64:
1280                 break;
1281         default:
1282                 return false;
1283         }
1284         return true;
1285 }
1286
1287 #endif /* _LTTNG_EVENTS_H */