include/lttng/events.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <linux/version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <linux/uuid.h>
  18 #include <linux/irq_work.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng/cpuhotplug.h>
  21 #include <lttng/tracer.h>
  22 #include <lttng/abi.h>
  23 #include <lttng/abi-old.h>
  24 #include <lttng/endian.h>
  25
  26 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lib_ring_buffer_ctx;
  32 struct perf_event;
  33 struct perf_event_attr;
  34 struct lib_ring_buffer_config;
  35
  36 /* Type description */
  37
  38 enum abstract_types {
  39         atype_integer,
  40         atype_string,
  41         atype_enum_nestable,
  42         atype_array_nestable,
  43         atype_sequence_nestable,
  44         atype_struct_nestable,
  45         atype_variant_nestable,
  46         NR_ABSTRACT_TYPES,
  47 };
  48
  49 enum lttng_string_encodings {
  50         lttng_encode_none = 0,
  51         lttng_encode_UTF8 = 1,
  52         lttng_encode_ASCII = 2,
  53         NR_STRING_ENCODINGS,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_enum_entry {
  67         struct lttng_enum_value start, end;     /* start and end are inclusive */
  68         const char *string;
  69         struct {
  70                 unsigned int is_auto:1;
  71         } options;
  72 };
  73
  74 #define __type_integer(_type, _size, _alignment, _signedness,   \
  75                 _byte_order, _base, _encoding)  \
  76         {                                                       \
  77             .atype = atype_integer,                             \
  78             .u.integer =                                        \
  79                 {                                               \
  80                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  81                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  82                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  83                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  84                   .base = _base,                                \
  85                   .encoding = lttng_encode_##_encoding,         \
  86                 },                                              \
  87         }                                                       \
  88
  89 struct lttng_integer_type {
  90         unsigned int size;              /* in bits */
  91         unsigned short alignment;       /* in bits */
  92         unsigned int signedness:1,
  93                 reverse_byte_order:1;
  94         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  95         enum lttng_string_encodings encoding;
  96 };
  97
  98 struct lttng_type {
  99         enum abstract_types atype;
 100         union {
 101                 struct lttng_integer_type integer;
 102                 struct {
 103                         enum lttng_string_encodings encoding;
 104                 } string;
 105                 struct {
 106                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 107                         const struct lttng_type *container_type;
 108                 } enum_nestable;
 109                 struct {
 110                         const struct lttng_type *elem_type;
 111                         unsigned int length;                    /* Num. elems. */
 112                         unsigned int alignment;
 113                 } array_nestable;
 114                 struct {
 115                         const char *length_name;                /* Length field name. */
 116                         const struct lttng_type *elem_type;
 117                         unsigned int alignment;                 /* Alignment before elements. */
 118                 } sequence_nestable;
 119                 struct {
 120                         unsigned int nr_fields;
 121                         const struct lttng_event_field *fields; /* Array of fields. */
 122                         unsigned int alignment;
 123                 } struct_nestable;
 124                 struct {
 125                         const char *tag_name;
 126                         const struct lttng_event_field *choices; /* Array of fields. */
 127                         unsigned int nr_choices;
 128                         unsigned int alignment;
 129                 } variant_nestable;
 130         } u;
 131 };
 132
 133 struct lttng_enum_desc {
 134         const char *name;
 135         const struct lttng_enum_entry *entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_event_field {
 142         const char *name;
 143         struct lttng_type type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1,         /* fetch from user-space */
 146                         nofilter:1;     /* do not consider for filter */
 147 };
 148
 149 union lttng_ctx_value {
 150         int64_t s64;
 151         const char *str;
 152         double d;
 153 };
 154
 155 /*
 156  * We need to keep this perf counter field separately from struct
 157  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 158  */
 159 struct lttng_perf_counter_field {
 160 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 161         struct lttng_cpuhp_node cpuhp_prepare;
 162         struct lttng_cpuhp_node cpuhp_online;
 163 #else
 164         struct notifier_block nb;
 165         int hp_enable;
 166 #endif
 167         struct perf_event_attr *attr;
 168         struct perf_event **e;  /* per-cpu array */
 169 };
 170
 171 struct lttng_probe_ctx {
 172         struct lttng_event *event;
 173         struct lttng_event_notifier *event_notifier; // Not sure if we will ever need it.
 174         uint8_t interruptible;
 175 };
 176
 177 struct lttng_ctx_field {
 178         struct lttng_event_field event_field;
 179         size_t (*get_size)(size_t offset);
 180         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 181                                struct lib_ring_buffer_ctx *ctx,
 182                                struct lttng_channel *chan);
 183         void (*record)(struct lttng_ctx_field *field,
 184                        struct lib_ring_buffer_ctx *ctx,
 185                        struct lttng_channel *chan);
 186         void (*get_value)(struct lttng_ctx_field *field,
 187                          struct lttng_probe_ctx *lttng_probe_ctx,
 188                          union lttng_ctx_value *value);
 189         union {
 190                 struct lttng_perf_counter_field *perf_counter;
 191         } u;
 192         void (*destroy)(struct lttng_ctx_field *field);
 193         /*
 194          * Private data to keep state between get_size and record.
 195          * User must perform its own synchronization to protect against
 196          * concurrent and reentrant contexts.
 197          */
 198         void *priv;
 199 };
 200
 201 struct lttng_ctx {
 202         struct lttng_ctx_field *fields;
 203         unsigned int nr_fields;
 204         unsigned int allocated_fields;
 205         size_t largest_align;   /* in bytes */
 206 };
 207
 208 struct lttng_event_desc {
 209         const char *name;               /* lttng-modules name */
 210         const char *kname;              /* Linux kernel name (tracepoints) */
 211         void *probe_callback;
 212         const struct lttng_event_ctx *ctx;      /* context */
 213         const struct lttng_event_field *fields; /* event payload */
 214         unsigned int nr_fields;
 215         struct module *owner;
 216         void *event_notifier_callback;
 217 };
 218
 219 struct lttng_probe_desc {
 220         const char *provider;
 221         const struct lttng_event_desc **event_desc;
 222         unsigned int nr_events;
 223         struct list_head head;                  /* chain registered probes */
 224         struct list_head lazy_init_head;
 225         int lazy;                               /* lazy registration */
 226 };
 227
 228 struct lttng_krp;                               /* Kretprobe handling */
 229
 230 enum lttng_event_type {
 231         LTTNG_TYPE_EVENT = 0,
 232         LTTNG_TYPE_ENABLER = 1,
 233 };
 234
 235 struct lttng_filter_bytecode_node {
 236         struct list_head node;
 237         struct lttng_enabler *enabler;
 238         /*
 239          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 240          * last field.
 241          */
 242         struct lttng_kernel_filter_bytecode bc;
 243 };
 244
 245 /*
 246  * Filter return value masks.
 247  */
 248 enum lttng_filter_ret {
 249         LTTNG_FILTER_DISCARD = 0,
 250         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 251         /* Other bits are kept for future use. */
 252 };
 253
 254 struct lttng_bytecode_runtime {
 255         /* Associated bytecode */
 256         struct lttng_filter_bytecode_node *bc;
 257         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 258                         const char *filter_stack_data);
 259         int link_failed;
 260         struct list_head node;  /* list of bytecode runtime in event */
 261         struct lttng_ctx *ctx;
 262 };
 263
 264 /*
 265  * Objects in a linked-list of enablers, owned by an event.
 266  */
 267 struct lttng_enabler_ref {
 268         struct list_head node;                  /* enabler ref list */
 269         struct lttng_enabler *ref;              /* backward ref */
 270 };
 271
 272 struct lttng_uprobe_handler {
 273         union {
 274                 struct lttng_event *event;
 275                 struct lttng_event_notifier *event_notifier;
 276         } u;
 277         loff_t offset;
 278         struct uprobe_consumer up_consumer;
 279         struct list_head node;
 280 };
 281
 282 struct lttng_kprobe {
 283         struct kprobe kp;
 284         char *symbol_name;
 285 };
 286
 287 struct lttng_uprobe {
 288         struct inode *inode;
 289         struct list_head head;
 290 };
 291
 292 enum lttng_syscall_entryexit {
 293         LTTNG_SYSCALL_ENTRY,
 294         LTTNG_SYSCALL_EXIT,
 295 };
 296
 297 enum lttng_syscall_abi {
 298         LTTNG_SYSCALL_ABI_NATIVE,
 299         LTTNG_SYSCALL_ABI_COMPAT,
 300 };
 301
 302 /*
 303  * lttng_event structure is referred to by the tracing fast path. It must be
 304  * kept small.
 305  */
 306 struct lttng_event {
 307         enum lttng_event_type evtype;   /* First field. */
 308         unsigned int id;
 309         struct lttng_channel *chan;
 310         int enabled;
 311         const struct lttng_event_desc *desc;
 312         void *filter;
 313         struct lttng_ctx *ctx;
 314         enum lttng_kernel_instrumentation instrumentation;
 315         union {
 316                 struct lttng_kprobe kprobe;
 317                 struct {
 318                         struct lttng_krp *lttng_krp;
 319                         char *symbol_name;
 320                 } kretprobe;
 321                 struct lttng_uprobe uprobe;
 322                 struct {
 323                         enum lttng_syscall_entryexit entryexit;
 324                         enum lttng_syscall_abi abi;
 325                 } syscall;
 326         } u;
 327         struct list_head list;          /* Event list in session */
 328         unsigned int metadata_dumped:1;
 329
 330         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 331         struct list_head enablers_ref_head;
 332         struct hlist_node hlist;        /* session ht of events */
 333         int registered;                 /* has reg'd tracepoint probe */
 334         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 335         struct list_head filter_bytecode_runtime_head;
 336         int has_enablers_without_bytecode;
 337 };
 338
 339 // FIXME: Really similar to lttng_event above. Could those be merged ?
 340 struct lttng_event_notifier {
 341         enum lttng_event_type evtype;   /* First field. */
 342         uint64_t user_token;
 343         int enabled;
 344         int registered;                 /* has reg'd tracepoint probe */
 345         const struct lttng_event_desc *desc;
 346         void *filter;
 347         struct list_head list;          /* event_notifier list in event_notifier group */
 348
 349         enum lttng_kernel_instrumentation instrumentation;
 350         union {
 351                 struct lttng_kprobe kprobe;
 352                 struct lttng_uprobe uprobe;
 353                 struct {
 354                         enum lttng_syscall_entryexit entryexit;
 355                         enum lttng_syscall_abi abi;
 356                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 357                         unsigned int syscall_id;
 358                 } syscall;
 359
 360         } u;
 361
 362         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 363         struct list_head enablers_ref_head;
 364         struct hlist_node hlist;        /* session ht of event_notifiers */
 365         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 366         struct list_head filter_bytecode_runtime_head;
 367         int has_enablers_without_bytecode;
 368
 369         void (*send_notification)(struct lttng_event_notifier *event_notifier);
 370         struct lttng_event_notifier_group *group; /* Weak ref */
 371 };
 372
 373 enum lttng_enabler_format_type {
 374         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 375         LTTNG_ENABLER_FORMAT_NAME,
 376 };
 377
 378 /*
 379  * Enabler field, within whatever object is enabling an event. Target of
 380  * backward reference.
 381  */
 382 struct lttng_enabler {
 383         enum lttng_event_type evtype;   /* First field. */
 384
 385         enum lttng_enabler_format_type format_type;
 386
 387         /* head list of struct lttng_ust_filter_bytecode_node */
 388         struct list_head filter_bytecode_head;
 389
 390         struct lttng_kernel_event event_param;
 391         unsigned int enabled:1;
 392
 393         uint64_t user_token;            /* User-provided token. */
 394 };
 395
 396 struct lttng_event_enabler {
 397         struct lttng_enabler base;
 398         struct list_head node;  /* per-session list of enablers */
 399         struct lttng_channel *chan;
 400         /*
 401          * Unused, but kept around to make it explicit that the tracer can do
 402          * it.
 403          */
 404         struct lttng_ctx *ctx;
 405 };
 406
 407 struct lttng_event_notifier_enabler {
 408         struct lttng_enabler base;
 409         struct list_head node;  /* List of event_notifier enablers */
 410         struct lttng_event_notifier_group *group;
 411 };
 412
 413 static inline
 414 struct lttng_enabler *lttng_event_enabler_as_enabler(
 415                 struct lttng_event_enabler *event_enabler)
 416 {
 417         return &event_enabler->base;
 418 }
 419
 420 static inline
 421 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 422                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 423 {
 424         return &event_notifier_enabler->base;
 425 }
 426
 427 struct lttng_channel_ops {
 428         struct channel *(*channel_create)(const char *name,
 429                                 void *priv,
 430                                 void *buf_addr,
 431                                 size_t subbuf_size, size_t num_subbuf,
 432                                 unsigned int switch_timer_interval,
 433                                 unsigned int read_timer_interval);
 434         void (*channel_destroy)(struct channel *chan);
 435         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 436         int (*buffer_has_read_closed_stream)(struct channel *chan);
 437         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 438         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 439                              uint32_t event_id);
 440         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 441         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 442                             size_t len);
 443         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 444                                       const void *src, size_t len);
 445         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 446                              int c, size_t len);
 447         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 448                              size_t len);
 449         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 450                                        const char __user *src, size_t len);
 451         /*
 452          * packet_avail_size returns the available size in the current
 453          * packet. Note that the size returned is only a hint, since it
 454          * may change due to concurrent writes.
 455          */
 456         size_t (*packet_avail_size)(struct channel *chan);
 457         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 458         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 459         int (*is_finalized)(struct channel *chan);
 460         int (*is_disabled)(struct channel *chan);
 461         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 462                         struct lib_ring_buffer *bufb,
 463                         uint64_t *timestamp_begin);
 464         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 465                         struct lib_ring_buffer *bufb,
 466                         uint64_t *timestamp_end);
 467         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 468                         struct lib_ring_buffer *bufb,
 469                         uint64_t *events_discarded);
 470         int (*content_size) (const struct lib_ring_buffer_config *config,
 471                         struct lib_ring_buffer *bufb,
 472                         uint64_t *content_size);
 473         int (*packet_size) (const struct lib_ring_buffer_config *config,
 474                         struct lib_ring_buffer *bufb,
 475                         uint64_t *packet_size);
 476         int (*stream_id) (const struct lib_ring_buffer_config *config,
 477                         struct lib_ring_buffer *bufb,
 478                         uint64_t *stream_id);
 479         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 480                         struct lib_ring_buffer *bufb,
 481                         uint64_t *ts);
 482         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 483                         struct lib_ring_buffer *bufb,
 484                         uint64_t *seq);
 485         int (*instance_id) (const struct lib_ring_buffer_config *config,
 486                         struct lib_ring_buffer *bufb,
 487                         uint64_t *id);
 488 };
 489
 490 struct lttng_transport {
 491         char *name;
 492         struct module *owner;
 493         struct list_head node;
 494         struct lttng_channel_ops ops;
 495 };
 496
 497 struct lttng_syscall_filter;
 498
 499 #define LTTNG_EVENT_HT_BITS             12
 500 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 501
 502 struct lttng_event_ht {
 503         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 504 };
 505
 506 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 507 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 508
 509 struct lttng_event_notifier_ht {
 510         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 511 };
 512
 513 struct lttng_channel {
 514         unsigned int id;
 515         struct channel *chan;           /* Channel buffers */
 516         int enabled;
 517         struct lttng_ctx *ctx;
 518         /* Event ID management */
 519         struct lttng_session *session;
 520         struct file *file;              /* File associated to channel */
 521         unsigned int free_event_id;     /* Next event ID to allocate */
 522         struct list_head list;          /* Channel list */
 523         struct lttng_channel_ops *ops;
 524         struct lttng_transport *transport;
 525         struct lttng_event **sc_table;  /* for syscall tracing */
 526         struct lttng_event **compat_sc_table;
 527         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 528         struct lttng_event **compat_sc_exit_table;
 529         struct lttng_event *sc_unknown; /* for unknown syscalls */
 530         struct lttng_event *sc_compat_unknown;
 531         struct lttng_event *sc_exit_unknown;
 532         struct lttng_event *compat_sc_exit_unknown;
 533         struct lttng_syscall_filter *sc_filter;
 534         int header_type;                /* 0: unset, 1: compact, 2: large */
 535         enum channel_type channel_type;
 536         int syscall_all;
 537         unsigned int metadata_dumped:1,
 538                 sys_enter_registered:1,
 539                 sys_exit_registered:1,
 540                 tstate:1;               /* Transient enable state */
 541 };
 542
 543 struct lttng_metadata_stream {
 544         void *priv;                     /* Ring buffer private data */
 545         struct lttng_metadata_cache *metadata_cache;
 546         unsigned int metadata_in;       /* Bytes read from the cache */
 547         unsigned int metadata_out;      /* Bytes consumed from stream */
 548         int finalized;                  /* Has channel been finalized */
 549         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 550         struct list_head list;          /* Stream list */
 551         struct lttng_transport *transport;
 552         uint64_t version;               /* Current version of the metadata cache */
 553         bool coherent;                  /* Stream in a coherent state */
 554 };
 555
 556 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 557
 558 struct lttng_dynamic_len_stack {
 559         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 560         size_t offset;
 561 };
 562
 563 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 564
 565 /*
 566  * struct lttng_id_tracker declared in header due to deferencing of *v
 567  * in RCU_INITIALIZER(v).
 568  */
 569 #define LTTNG_ID_HASH_BITS      6
 570 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 571
 572 enum tracker_type {
 573         TRACKER_PID,
 574         TRACKER_VPID,
 575         TRACKER_UID,
 576         TRACKER_VUID,
 577         TRACKER_GID,
 578         TRACKER_VGID,
 579
 580         TRACKER_UNKNOWN,
 581 };
 582
 583 struct lttng_id_tracker_rcu {
 584         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 585 };
 586
 587 struct lttng_id_tracker {
 588         struct lttng_session *session;
 589         enum tracker_type tracker_type;
 590         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 591 };
 592
 593 struct lttng_id_hash_node {
 594         struct hlist_node hlist;
 595         int id;
 596 };
 597
 598 struct lttng_session {
 599         int active;                     /* Is trace session active ? */
 600         int been_active;                /* Has trace session been active ? */
 601         struct file *file;              /* File associated to session */
 602         struct list_head chan;          /* Channel list head */
 603         struct list_head events;        /* Event list head */
 604         struct list_head list;          /* Session list */
 605         unsigned int free_chan_id;      /* Next chan ID to allocate */
 606         uuid_le uuid;                   /* Trace session unique ID */
 607         struct lttng_metadata_cache *metadata_cache;
 608         struct lttng_id_tracker pid_tracker;
 609         struct lttng_id_tracker vpid_tracker;
 610         struct lttng_id_tracker uid_tracker;
 611         struct lttng_id_tracker vuid_tracker;
 612         struct lttng_id_tracker gid_tracker;
 613         struct lttng_id_tracker vgid_tracker;
 614         unsigned int metadata_dumped:1,
 615                 tstate:1;               /* Transient enable state */
 616         /* List of event enablers */
 617         struct list_head enablers_head;
 618         /* Hash table of events */
 619         struct lttng_event_ht events_ht;
 620         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 621         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 622 };
 623
 624 struct lttng_event_notifier_group {
 625         struct file *file;              /* File associated to event notifier group */
 626         struct file *notif_file;        /* File used to expose notifications to userspace. */
 627         struct list_head node;          /* event notifier group list */
 628         struct list_head enablers_head; /* List of enablers */
 629         struct list_head event_notifiers_head; /* List of event notifier */
 630         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 631         struct lttng_ctx *ctx;          /* Contexts for filters. */
 632         struct lttng_channel_ops *ops;
 633         struct lttng_transport *transport;
 634         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 635         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 636         wait_queue_head_t read_wait;
 637         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 638         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 639         struct lttng_event_notifier *sc_compat_unknown;
 640
 641         struct lttng_syscall_filter *sc_filter;
 642
 643         struct hlist_head *event_notifier_syscall_dispatch;
 644         struct hlist_head *event_notifier_compat_syscall_dispatch;
 645         struct hlist_head *event_notifier_exit_syscall_dispatch;
 646         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 647
 648         struct hlist_head event_notifier_unknown_syscall_dispatch;
 649         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 650         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 651         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 652
 653         int syscall_all_entry;
 654         int syscall_all_exit;
 655
 656         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 657
 658         struct lttng_counter *error_counter;
 659         size_t error_counter_len;
 660 };
 661
 662 struct lttng_metadata_cache {
 663         char *data;                     /* Metadata cache */
 664         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 665         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 666         atomic_t producing;             /* Metadata being produced (incomplete) */
 667         struct kref refcount;           /* Metadata cache usage */
 668         struct list_head metadata_stream;       /* Metadata stream list */
 669         uuid_le uuid;                   /* Trace session unique ID (copy) */
 670         struct mutex lock;              /* Produce/consume lock */
 671         uint64_t version;               /* Current version of the metadata */
 672 };
 673
 674 void lttng_lock_sessions(void);
 675 void lttng_unlock_sessions(void);
 676
 677 struct list_head *lttng_get_probe_list_head(void);
 678
 679 struct lttng_event_enabler *lttng_event_enabler_create(
 680                 enum lttng_enabler_format_type format_type,
 681                 struct lttng_kernel_event *event_param,
 682                 struct lttng_channel *chan);
 683
 684 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 685 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 686 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 687                 struct lttng_event_notifier_group *event_notifier_group,
 688                 enum lttng_enabler_format_type format_type,
 689                 struct lttng_kernel_event_notifier *event_notifier_param);
 690
 691 int lttng_event_notifier_enabler_enable(
 692                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 693 int lttng_event_notifier_enabler_disable(
 694                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 695 int lttng_fix_pending_events(void);
 696 int lttng_fix_pending_event_notifiers(void);
 697 int lttng_session_active(void);
 698 bool lttng_event_notifier_active(void);
 699
 700 struct lttng_session *lttng_session_create(void);
 701 int lttng_session_enable(struct lttng_session *session);
 702 int lttng_session_disable(struct lttng_session *session);
 703 void lttng_session_destroy(struct lttng_session *session);
 704 int lttng_session_metadata_regenerate(struct lttng_session *session);
 705 int lttng_session_statedump(struct lttng_session *session);
 706 void metadata_cache_destroy(struct kref *kref);
 707
 708 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 709 void lttng_event_notifier_group_destroy(
 710                 struct lttng_event_notifier_group *event_notifier_group);
 711
 712 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 713                                        const char *transport_name,
 714                                        void *buf_addr,
 715                                        size_t subbuf_size, size_t num_subbuf,
 716                                        unsigned int switch_timer_interval,
 717                                        unsigned int read_timer_interval,
 718                                        enum channel_type channel_type);
 719 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 720                                        int overwrite, void *buf_addr,
 721                                        size_t subbuf_size, size_t num_subbuf,
 722                                        unsigned int switch_timer_interval,
 723                                        unsigned int read_timer_interval);
 724
 725 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 726 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 727                                 struct lttng_kernel_event *event_param,
 728                                 void *filter,
 729                                 const struct lttng_event_desc *event_desc,
 730                                 enum lttng_kernel_instrumentation itype);
 731 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 732                                 struct lttng_kernel_event *event_param,
 733                                 void *filter,
 734                                 const struct lttng_event_desc *event_desc,
 735                                 enum lttng_kernel_instrumentation itype);
 736 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 737                 struct lttng_kernel_old_event *old_event_param,
 738                 void *filter,
 739                 const struct lttng_event_desc *internal_desc);
 740
 741 struct lttng_event_notifier *lttng_event_notifier_create(
 742                                 const struct lttng_event_desc *event_notifier_desc,
 743                                 uint64_t id,
 744                                 struct lttng_event_notifier_group *event_notifier_group,
 745                                 struct lttng_kernel_event_notifier *event_notifier_param,
 746                                 void *filter,
 747                                 enum lttng_kernel_instrumentation itype);
 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
 756 int lttng_channel_enable(struct lttng_channel *channel);
 757 int lttng_channel_disable(struct lttng_channel *channel);
 758 int lttng_event_enable(struct lttng_event *event);
 759 int lttng_event_disable(struct lttng_event *event);
 760
 761 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 762 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 763
 764 void lttng_transport_register(struct lttng_transport *transport);
 765 void lttng_transport_unregister(struct lttng_transport *transport);
 766
 767 void synchronize_trace(void);
 768 int lttng_abi_init(void);
 769 int lttng_abi_compat_old_init(void);
 770 void lttng_abi_exit(void);
 771 void lttng_abi_compat_old_exit(void);
 772
 773 int lttng_probe_register(struct lttng_probe_desc *desc);
 774 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 775 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 776 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 777 int lttng_probes_init(void);
 778 void lttng_probes_exit(void);
 779
 780 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 781                 struct channel *chan, bool *coherent);
 782
 783 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 784 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 785 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 786 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 787 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 788 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 789
 790 int lttng_session_track_id(struct lttng_session *session,
 791                 enum tracker_type tracker_type, int id);
 792 int lttng_session_untrack_id(struct lttng_session *session,
 793                 enum tracker_type tracker_type, int id);
 794
 795 int lttng_session_list_tracker_ids(struct lttng_session *session,
 796                 enum tracker_type tracker_type);
 797
 798 void lttng_clock_ref(void);
 799 void lttng_clock_unref(void);
 800
 801 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 802                 struct lttng_enabler *enabler);
 803
 804 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 805 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 806 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 807 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 808 int lttng_syscall_filter_enable_event(
 809                 struct lttng_channel *chan,
 810                 struct lttng_event *event);
 811 int lttng_syscall_filter_disable_event(
 812                 struct lttng_channel *chan,
 813                 struct lttng_event *event);
 814
 815 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 816                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 817
 818 int lttng_syscalls_register_event_notifier(
 819                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 820                 void *filter);
 821 int lttng_syscals_create_matching_event_notifiers(
 822                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 823 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 824 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 825 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 826 #else
 827 static inline int lttng_syscalls_register_event(
 828                 struct lttng_channel *chan, void *filter)
 829 {
 830         return -ENOSYS;
 831 }
 832
 833 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 834 {
 835         return 0;
 836 }
 837
 838 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 839 {
 840         return 0;
 841 }
 842
 843 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 844                 struct lttng_event *event);
 845 {
 846         return -ENOSYS;
 847 }
 848
 849 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 850                 struct lttng_event *event);
 851 {
 852         return -ENOSYS;
 853 }
 854
 855 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 856                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 857 {
 858         return -ENOSYS;
 859 }
 860
 861 static inline int lttng_syscalls_register_event_notifier(
 862                 struct lttng_event_notifier_group *group, void *filter)
 863 {
 864         return -ENOSYS;
 865 }
 866
 867 static inline int lttng_syscalls_unregister_event_notifier(
 868                 struct lttng_event_notifier_group *group)
 869 {
 870         return 0;
 871 }
 872
 873 static inline int lttng_syscall_filter_enable_event_notifier(
 874                 struct lttng_event_notifier_group *group,
 875                 const char *name)
 876 {
 877         return -ENOSYS;
 878 }
 879
 880 static inline int lttng_syscall_filter_disable_event_notifier(
 881                 struct lttng_event_notifier_group *group,
 882                 const char *name)
 883 {
 884         return -ENOSYS;
 885 }
 886
 887 #endif
 888
 889 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 890 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 891                 struct lttng_kernel_filter_bytecode __user *bytecode);
 892 int lttng_event_notifier_enabler_attach_filter_bytecode(
 893                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 894                 struct lttng_kernel_filter_bytecode __user *bytecode);
 895
 896 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 897                 struct lttng_ctx *ctx,
 898                 struct list_head *bytecode_runtime_head,
 899                 struct lttng_enabler *enabler);
 900
 901 int lttng_probes_init(void);
 902
 903 extern struct lttng_ctx *lttng_static_ctx;
 904
 905 int lttng_context_init(void);
 906 void lttng_context_exit(void);
 907 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 908 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 909 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 910                 size_t index);
 911 void lttng_context_update(struct lttng_ctx *ctx);
 912 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 913 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 914 void lttng_remove_context_field(struct lttng_ctx **ctx,
 915                                 struct lttng_ctx_field *field);
 916 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 917 void lttng_destroy_context(struct lttng_ctx *ctx);
 918 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 919 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 920 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 921 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 922 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 923 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 924 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 925 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 926 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 927 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 928 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 929 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 930 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 931 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 932 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 933 #else
 934 static inline
 935 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 936 {
 937         return -ENOSYS;
 938 }
 939 #endif
 940 #ifdef CONFIG_PREEMPT_RT_FULL
 941 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 942 #else
 943 static inline
 944 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 945 {
 946         return -ENOSYS;
 947 }
 948 #endif
 949
 950 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 951
 952 #if defined(CONFIG_CGROUPS) && \
 953         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 954          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 955 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 956 #else
 957 static inline
 958 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 959 {
 960         return -ENOSYS;
 961 }
 962 #endif
 963
 964 #if defined(CONFIG_IPC_NS) && \
 965         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 966 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 967 #else
 968 static inline
 969 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 970 {
 971         return -ENOSYS;
 972 }
 973 #endif
 974
 975 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 976         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 977 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 978 #else
 979 static inline
 980 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 981 {
 982         return -ENOSYS;
 983 }
 984 #endif
 985
 986 #if defined(CONFIG_NET_NS) && \
 987         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 988 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 989 #else
 990 static inline
 991 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
 992 {
 993         return -ENOSYS;
 994 }
 995 #endif
 996
 997 #if defined(CONFIG_PID_NS) && \
 998         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 999 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1000 #else
1001 static inline
1002 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1003 {
1004         return -ENOSYS;
1005 }
1006 #endif
1007
1008 #if defined(CONFIG_USER_NS) && \
1009         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1010 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1011 #else
1012 static inline
1013 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1014 {
1015         return -ENOSYS;
1016 }
1017 #endif
1018
1019 #if defined(CONFIG_UTS_NS) && \
1020         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1021 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1022 #else
1023 static inline
1024 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1025 {
1026         return -ENOSYS;
1027 }
1028 #endif
1029
1030 #if defined(CONFIG_TIME_NS) && \
1031         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1032 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1033 #else
1034 static inline
1035 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1036 {
1037         return -ENOSYS;
1038 }
1039 #endif
1040
1041 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1042 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1043 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1044 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1045 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1046 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1047 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1048 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1049 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1050 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1051 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1052 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1053
1054 #if defined(CONFIG_PERF_EVENTS)
1055 int lttng_add_perf_counter_to_ctx(uint32_t type,
1056                                   uint64_t config,
1057                                   const char *name,
1058                                   struct lttng_ctx **ctx);
1059 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1060                 struct lttng_cpuhp_node *node);
1061 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1062                 struct lttng_cpuhp_node *node);
1063 #else
1064 static inline
1065 int lttng_add_perf_counter_to_ctx(uint32_t type,
1066                                   uint64_t config,
1067                                   const char *name,
1068                                   struct lttng_ctx **ctx)
1069 {
1070         return -ENOSYS;
1071 }
1072 static inline
1073 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1074                 struct lttng_cpuhp_node *node)
1075 {
1076         return 0;
1077 }
1078 static inline
1079 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1080                 struct lttng_cpuhp_node *node)
1081 {
1082         return 0;
1083 }
1084 #endif
1085
1086 int lttng_logger_init(void);
1087 void lttng_logger_exit(void);
1088
1089 extern int lttng_statedump_start(struct lttng_session *session);
1090
1091 #ifdef CONFIG_KPROBES
1092 int lttng_kprobes_register_event(const char *name,
1093                 const char *symbol_name,
1094                 uint64_t offset,
1095                 uint64_t addr,
1096                 struct lttng_event *event);
1097 void lttng_kprobes_unregister_event(struct lttng_event *event);
1098 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1099 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1100                 uint64_t offset,
1101                 uint64_t addr,
1102                 struct lttng_event_notifier *event_notifier);
1103 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1104 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1105 #else
1106 static inline
1107 int lttng_kprobes_register_event(const char *name,
1108                 const char *symbol_name,
1109                 uint64_t offset,
1110                 uint64_t addr,
1111                 struct lttng_event *event)
1112 {
1113         return -ENOSYS;
1114 }
1115
1116 static inline
1117 void lttng_kprobes_unregister_event(struct lttng_event *event)
1118 {
1119 }
1120
1121 static inline
1122 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1123 {
1124 }
1125
1126 static inline
1127 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1128                 uint64_t offset,
1129                 uint64_t addr,
1130                 struct lttng_event_notifier *event_notifier)
1131 {
1132         return -ENOSYS;
1133 }
1134
1135 static inline
1136 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1137 {
1138 }
1139
1140 static inline
1141 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1142 {
1143 }
1144 #endif
1145
1146 int lttng_event_add_callsite(struct lttng_event *event,
1147         struct lttng_kernel_event_callsite *callsite);
1148
1149 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1150         struct lttng_kernel_event_callsite *callsite);
1151
1152 #ifdef CONFIG_UPROBES
1153 int lttng_uprobes_register_event(const char *name,
1154         int fd, struct lttng_event *event);
1155 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1156         struct lttng_kernel_event_callsite *callsite);
1157 void lttng_uprobes_unregister_event(struct lttng_event *event);
1158 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1159 int lttng_uprobes_register_event_notifier(const char *name,
1160         int fd, struct lttng_event_notifier *event_notifier);
1161 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1162         struct lttng_kernel_event_callsite *callsite);
1163 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1164 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1165 #else
1166 static inline
1167 int lttng_uprobes_register_event(const char *name,
1168         int fd, struct lttng_event *event)
1169 {
1170         return -ENOSYS;
1171 }
1172
1173 static inline
1174 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1175         struct lttng_kernel_event_callsite *callsite)
1176 {
1177         return -ENOSYS;
1178 }
1179
1180 static inline
1181 void lttng_uprobes_unregister_event(struct lttng_event *event)
1182 {
1183 }
1184
1185 static inline
1186 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1187 {
1188 }
1189
1190 static inline
1191 int lttng_uprobes_register_event_notifier(const char *name,
1192         int fd, struct lttng_event_notifier *event_notifier)
1193 {
1194         return -ENOSYS;
1195 }
1196
1197 static inline
1198 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1199         struct lttng_kernel_event_callsite *callsite)
1200 {
1201         return -ENOSYS;
1202 }
1203
1204 static inline
1205 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1206 {
1207 }
1208
1209 static inline
1210 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1211 {
1212 }
1213 #endif
1214
1215 #ifdef CONFIG_KRETPROBES
1216 int lttng_kretprobes_register(const char *name,
1217                 const char *symbol_name,
1218                 uint64_t offset,
1219                 uint64_t addr,
1220                 struct lttng_event *event_entry,
1221                 struct lttng_event *event_exit);
1222 void lttng_kretprobes_unregister(struct lttng_event *event);
1223 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1224 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1225         int enable);
1226 #else
1227 static inline
1228 int lttng_kretprobes_register(const char *name,
1229                 const char *symbol_name,
1230                 uint64_t offset,
1231                 uint64_t addr,
1232                 struct lttng_event *event_entry,
1233                 struct lttng_event *event_exit)
1234 {
1235         return -ENOSYS;
1236 }
1237
1238 static inline
1239 void lttng_kretprobes_unregister(struct lttng_event *event)
1240 {
1241 }
1242
1243 static inline
1244 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1245 {
1246 }
1247
1248 static inline
1249 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1250         int enable)
1251 {
1252         return -ENOSYS;
1253 }
1254 #endif
1255
1256 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1257
1258 extern const struct file_operations lttng_tracepoint_list_fops;
1259 extern const struct file_operations lttng_syscall_list_fops;
1260
1261 #define TRACEPOINT_HAS_DATA_ARG
1262
1263 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1264 {
1265         if (type->atype != atype_integer)
1266                 return false;
1267         switch (type->u.integer.size) {
1268         case 8:         /* Fall-through. */
1269         case 16:        /* Fall-through. */
1270         case 32:        /* Fall-through. */
1271         case 64:
1272                 break;
1273         default:
1274                 return false;
1275         }
1276         return true;
1277 }
1278
1279 #endif /* _LTTNG_EVENTS_H */