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