include/lttng/events.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <linux/irq_work.h>
  14 #include <linux/version.h>
  15 #include <linux/list.h>
  16 #include <linux/kprobes.h>
  17 #include <linux/kref.h>
  18 #include <linux/uuid.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng/cpuhotplug.h>
  21 #include <lttng/tracer.h>
  22 #include <lttng/abi.h>
  23 #include <lttng/abi-old.h>
  24 #include <lttng/endian.h>
  25
  26 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lib_ring_buffer_ctx;
  32 struct perf_event;
  33 struct perf_event_attr;
  34 struct lib_ring_buffer_config;
  35
  36 /* Type description */
  37
  38 enum abstract_types {
  39         atype_integer,
  40         atype_string,
  41         atype_enum_nestable,
  42         atype_array_nestable,
  43         atype_sequence_nestable,
  44         atype_struct_nestable,
  45         atype_variant_nestable,
  46         NR_ABSTRACT_TYPES,
  47 };
  48
  49 enum lttng_string_encodings {
  50         lttng_encode_none = 0,
  51         lttng_encode_UTF8 = 1,
  52         lttng_encode_ASCII = 2,
  53         NR_STRING_ENCODINGS,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_enum_entry {
  67         struct lttng_enum_value start, end;     /* start and end are inclusive */
  68         const char *string;
  69         struct {
  70                 unsigned int is_auto:1;
  71         } options;
  72 };
  73
  74 #define __type_integer(_type, _size, _alignment, _signedness,   \
  75                 _byte_order, _base, _encoding)  \
  76         {                                                       \
  77             .atype = atype_integer,                             \
  78             .u.integer =                                        \
  79                 {                                               \
  80                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  81                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  82                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  83                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  84                   .base = _base,                                \
  85                   .encoding = lttng_encode_##_encoding,         \
  86                 },                                              \
  87         }                                                       \
  88
  89 struct lttng_integer_type {
  90         unsigned int size;              /* in bits */
  91         unsigned short alignment;       /* in bits */
  92         unsigned int signedness:1,
  93                 reverse_byte_order:1;
  94         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  95         enum lttng_string_encodings encoding;
  96 };
  97
  98 struct lttng_type {
  99         enum abstract_types atype;
 100         union {
 101                 struct lttng_integer_type integer;
 102                 struct {
 103                         enum lttng_string_encodings encoding;
 104                 } string;
 105                 struct {
 106                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 107                         const struct lttng_type *container_type;
 108                 } enum_nestable;
 109                 struct {
 110                         const struct lttng_type *elem_type;
 111                         unsigned int length;                    /* Num. elems. */
 112                         unsigned int alignment;
 113                 } array_nestable;
 114                 struct {
 115                         const char *length_name;                /* Length field name. */
 116                         const struct lttng_type *elem_type;
 117                         unsigned int alignment;                 /* Alignment before elements. */
 118                 } sequence_nestable;
 119                 struct {
 120                         unsigned int nr_fields;
 121                         const struct lttng_event_field *fields; /* Array of fields. */
 122                         unsigned int alignment;
 123                 } struct_nestable;
 124                 struct {
 125                         const char *tag_name;
 126                         const struct lttng_event_field *choices; /* Array of fields. */
 127                         unsigned int nr_choices;
 128                         unsigned int alignment;
 129                 } variant_nestable;
 130         } u;
 131 };
 132
 133 struct lttng_enum_desc {
 134         const char *name;
 135         const struct lttng_enum_entry *entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_event_field {
 142         const char *name;
 143         struct lttng_type type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1,         /* fetch from user-space */
 146                         nofilter:1;     /* do not consider for filter */
 147 };
 148
 149 union lttng_ctx_value {
 150         int64_t s64;
 151         const char *str;
 152         double d;
 153 };
 154
 155 /*
 156  * We need to keep this perf counter field separately from struct
 157  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 158  */
 159 struct lttng_perf_counter_field {
 160 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 161         struct lttng_cpuhp_node cpuhp_prepare;
 162         struct lttng_cpuhp_node cpuhp_online;
 163 #else
 164         struct notifier_block nb;
 165         int hp_enable;
 166 #endif
 167         struct perf_event_attr *attr;
 168         struct perf_event **e;  /* per-cpu array */
 169 };
 170
 171 struct lttng_probe_ctx {
 172         struct lttng_event *event;
 173         struct lttng_event_notifier *event_notifier; // Not sure if we will ever need it.
 174         uint8_t interruptible;
 175 };
 176
 177 struct lttng_ctx_field {
 178         struct lttng_event_field event_field;
 179         size_t (*get_size)(size_t offset);
 180         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 181                                struct lib_ring_buffer_ctx *ctx,
 182                                struct lttng_channel *chan);
 183         void (*record)(struct lttng_ctx_field *field,
 184                        struct lib_ring_buffer_ctx *ctx,
 185                        struct lttng_channel *chan);
 186         void (*get_value)(struct lttng_ctx_field *field,
 187                          struct lttng_probe_ctx *lttng_probe_ctx,
 188                          union lttng_ctx_value *value);
 189         union {
 190                 struct lttng_perf_counter_field *perf_counter;
 191         } u;
 192         void (*destroy)(struct lttng_ctx_field *field);
 193         /*
 194          * Private data to keep state between get_size and record.
 195          * User must perform its own synchronization to protect against
 196          * concurrent and reentrant contexts.
 197          */
 198         void *priv;
 199 };
 200
 201 struct lttng_ctx {
 202         struct lttng_ctx_field *fields;
 203         unsigned int nr_fields;
 204         unsigned int allocated_fields;
 205         size_t largest_align;   /* in bytes */
 206 };
 207
 208 struct lttng_event_desc {
 209         const char *name;               /* lttng-modules name */
 210         const char *kname;              /* Linux kernel name (tracepoints) */
 211         void *probe_callback;
 212         const struct lttng_event_ctx *ctx;      /* context */
 213         const struct lttng_event_field *fields; /* event payload */
 214         unsigned int nr_fields;
 215         struct module *owner;
 216         void *event_notifier_callback;
 217 };
 218
 219 struct lttng_probe_desc {
 220         const char *provider;
 221         const struct lttng_event_desc **event_desc;
 222         unsigned int nr_events;
 223         struct list_head head;                  /* chain registered probes */
 224         struct list_head lazy_init_head;
 225         int lazy;                               /* lazy registration */
 226 };
 227
 228 struct lttng_krp;                               /* Kretprobe handling */
 229
 230 enum lttng_event_type {
 231         LTTNG_TYPE_EVENT = 0,
 232         LTTNG_TYPE_ENABLER = 1,
 233 };
 234
 235 struct lttng_filter_bytecode_node {
 236         struct list_head node;
 237         struct lttng_enabler *enabler;
 238         /*
 239          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 240          * last field.
 241          */
 242         struct lttng_kernel_filter_bytecode bc;
 243 };
 244
 245 /*
 246  * Filter return value masks.
 247  */
 248 enum lttng_filter_ret {
 249         LTTNG_FILTER_DISCARD = 0,
 250         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 251         /* Other bits are kept for future use. */
 252 };
 253
 254 struct lttng_bytecode_runtime {
 255         /* Associated bytecode */
 256         struct lttng_filter_bytecode_node *bc;
 257         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 258                         const char *filter_stack_data);
 259         int link_failed;
 260         struct list_head node;  /* list of bytecode runtime in event */
 261         struct lttng_ctx *ctx;
 262 };
 263
 264 /*
 265  * Objects in a linked-list of enablers, owned by an event.
 266  */
 267 struct lttng_enabler_ref {
 268         struct list_head node;                  /* enabler ref list */
 269         struct lttng_enabler *ref;              /* backward ref */
 270 };
 271
 272 struct lttng_uprobe_handler {
 273         union {
 274                 struct lttng_event *event;
 275                 struct lttng_event_notifier *event_notifier;
 276         } u;
 277         loff_t offset;
 278         struct uprobe_consumer up_consumer;
 279         struct list_head node;
 280 };
 281
 282 struct lttng_kprobe {
 283         struct kprobe kp;
 284         char *symbol_name;
 285 };
 286
 287 struct lttng_uprobe {
 288         struct inode *inode;
 289         struct list_head head;
 290 };
 291
 292 enum lttng_syscall_entryexit {
 293         LTTNG_SYSCALL_ENTRY,
 294         LTTNG_SYSCALL_EXIT,
 295 };
 296
 297 enum lttng_syscall_abi {
 298         LTTNG_SYSCALL_ABI_NATIVE,
 299         LTTNG_SYSCALL_ABI_COMPAT,
 300 };
 301
 302 struct lttng_syscall {
 303         struct list_head node;                  /* chain registered syscall event_notifier */
 304         unsigned int syscall_id;
 305         bool is_compat;
 306 };
 307
 308 /*
 309  * lttng_event structure is referred to by the tracing fast path. It must be
 310  * kept small.
 311  */
 312 struct lttng_event {
 313         enum lttng_event_type evtype;   /* First field. */
 314         unsigned int id;
 315         struct lttng_channel *chan;
 316         int enabled;
 317         const struct lttng_event_desc *desc;
 318         void *filter;
 319         struct lttng_ctx *ctx;
 320         enum lttng_kernel_instrumentation instrumentation;
 321         union {
 322                 struct lttng_kprobe kprobe;
 323                 struct {
 324                         struct lttng_krp *lttng_krp;
 325                         char *symbol_name;
 326                 } kretprobe;
 327                 struct lttng_uprobe uprobe;
 328                 struct {
 329                         char *syscall_name;
 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 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 lttng_syscall syscall;
 361         } u;
 362
 363         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 364         struct list_head enablers_ref_head;
 365         struct hlist_node hlist;        /* session ht of event_notifiers */
 366         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 367         struct list_head bytecode_runtime_head;
 368         int has_enablers_without_bytecode;
 369
 370         void (*send_notification)(struct lttng_event_notifier *event_notifier);
 371         struct lttng_event_notifier_group *group; /* Weak ref */
 372 };
 373
 374 enum lttng_enabler_format_type {
 375         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 376         LTTNG_ENABLER_FORMAT_NAME,
 377 };
 378
 379 /*
 380  * Enabler field, within whatever object is enabling an event. Target of
 381  * backward reference.
 382  */
 383 struct lttng_enabler {
 384         enum lttng_event_type evtype;   /* First field. */
 385
 386         enum lttng_enabler_format_type format_type;
 387
 388         /* head list of struct lttng_ust_filter_bytecode_node */
 389         struct list_head filter_bytecode_head;
 390
 391         struct lttng_kernel_event event_param;
 392         unsigned int enabled:1;
 393
 394         uint64_t user_token;            /* User-provided token. */
 395 };
 396
 397 struct lttng_event_enabler {
 398         struct lttng_enabler base;
 399         struct list_head node;  /* per-session list of enablers */
 400         struct lttng_channel *chan;
 401         /*
 402          * Unused, but kept around to make it explicit that the tracer can do
 403          * it.
 404          */
 405         struct lttng_ctx *ctx;
 406 };
 407
 408 struct lttng_event_notifier_enabler {
 409         struct lttng_enabler base;
 410         struct list_head node;  /* List of event_notifier enablers */
 411         struct lttng_event_notifier_group *group;
 412 };
 413
 414 static inline
 415 struct lttng_enabler *lttng_event_enabler_as_enabler(
 416                 struct lttng_event_enabler *event_enabler)
 417 {
 418         return &event_enabler->base;
 419 }
 420
 421 static inline
 422 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 423                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 424 {
 425         return &event_notifier_enabler->base;
 426 }
 427
 428 struct lttng_channel_ops {
 429         struct channel *(*channel_create)(const char *name,
 430                                 void *priv,
 431                                 void *buf_addr,
 432                                 size_t subbuf_size, size_t num_subbuf,
 433                                 unsigned int switch_timer_interval,
 434                                 unsigned int read_timer_interval);
 435         void (*channel_destroy)(struct channel *chan);
 436         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 437         int (*buffer_has_read_closed_stream)(struct channel *chan);
 438         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 439         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 440                              uint32_t event_id);
 441         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 442         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 443                             size_t len);
 444         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 445                                       const void *src, size_t len);
 446         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 447                              int c, size_t len);
 448         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 449                              size_t len);
 450         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 451                                        const char __user *src, size_t len);
 452         /*
 453          * packet_avail_size returns the available size in the current
 454          * packet. Note that the size returned is only a hint, since it
 455          * may change due to concurrent writes.
 456          */
 457         size_t (*packet_avail_size)(struct channel *chan);
 458         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 459         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 460         int (*is_finalized)(struct channel *chan);
 461         int (*is_disabled)(struct channel *chan);
 462         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 463                         struct lib_ring_buffer *bufb,
 464                         uint64_t *timestamp_begin);
 465         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 466                         struct lib_ring_buffer *bufb,
 467                         uint64_t *timestamp_end);
 468         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 469                         struct lib_ring_buffer *bufb,
 470                         uint64_t *events_discarded);
 471         int (*content_size) (const struct lib_ring_buffer_config *config,
 472                         struct lib_ring_buffer *bufb,
 473                         uint64_t *content_size);
 474         int (*packet_size) (const struct lib_ring_buffer_config *config,
 475                         struct lib_ring_buffer *bufb,
 476                         uint64_t *packet_size);
 477         int (*stream_id) (const struct lib_ring_buffer_config *config,
 478                         struct lib_ring_buffer *bufb,
 479                         uint64_t *stream_id);
 480         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 481                         struct lib_ring_buffer *bufb,
 482                         uint64_t *ts);
 483         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 484                         struct lib_ring_buffer *bufb,
 485                         uint64_t *seq);
 486         int (*instance_id) (const struct lib_ring_buffer_config *config,
 487                         struct lib_ring_buffer *bufb,
 488                         uint64_t *id);
 489 };
 490
 491 struct lttng_transport {
 492         char *name;
 493         struct module *owner;
 494         struct list_head node;
 495         struct lttng_channel_ops ops;
 496 };
 497
 498 struct lttng_syscall_filter;
 499
 500 #define LTTNG_EVENT_HT_BITS             12
 501 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 502
 503 struct lttng_event_ht {
 504         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 505 };
 506
 507 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 508 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 509
 510 struct lttng_event_notifier_ht {
 511         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 512 };
 513
 514 struct lttng_channel {
 515         unsigned int id;
 516         struct channel *chan;           /* Channel buffers */
 517         int enabled;
 518         struct lttng_ctx *ctx;
 519         /* Event ID management */
 520         struct lttng_session *session;
 521         struct file *file;              /* File associated to channel */
 522         unsigned int free_event_id;     /* Next event ID to allocate */
 523         struct list_head list;          /* Channel list */
 524         struct lttng_channel_ops *ops;
 525         struct lttng_transport *transport;
 526         struct lttng_event **sc_table;  /* for syscall tracing */
 527         struct lttng_event **compat_sc_table;
 528         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 529         struct lttng_event **compat_sc_exit_table;
 530         struct lttng_event *sc_unknown; /* for unknown syscalls */
 531         struct lttng_event *sc_compat_unknown;
 532         struct lttng_event *sc_exit_unknown;
 533         struct lttng_event *compat_sc_exit_unknown;
 534         struct lttng_syscall_filter *sc_filter;
 535         int header_type;                /* 0: unset, 1: compact, 2: large */
 536         enum channel_type channel_type;
 537         int syscall_all;
 538         unsigned int metadata_dumped:1,
 539                 sys_enter_registered:1,
 540                 sys_exit_registered:1,
 541                 tstate:1;               /* Transient enable state */
 542 };
 543
 544 struct lttng_metadata_stream {
 545         void *priv;                     /* Ring buffer private data */
 546         struct lttng_metadata_cache *metadata_cache;
 547         unsigned int metadata_in;       /* Bytes read from the cache */
 548         unsigned int metadata_out;      /* Bytes consumed from stream */
 549         int finalized;                  /* Has channel been finalized */
 550         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 551         struct list_head list;          /* Stream list */
 552         struct lttng_transport *transport;
 553         uint64_t version;               /* Current version of the metadata cache */
 554         bool coherent;                  /* Stream in a coherent state */
 555 };
 556
 557 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 558
 559 struct lttng_dynamic_len_stack {
 560         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 561         size_t offset;
 562 };
 563
 564 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 565
 566 /*
 567  * struct lttng_id_tracker declared in header due to deferencing of *v
 568  * in RCU_INITIALIZER(v).
 569  */
 570 #define LTTNG_ID_HASH_BITS      6
 571 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 572
 573 enum tracker_type {
 574         TRACKER_PID,
 575         TRACKER_VPID,
 576         TRACKER_UID,
 577         TRACKER_VUID,
 578         TRACKER_GID,
 579         TRACKER_VGID,
 580
 581         TRACKER_UNKNOWN,
 582 };
 583
 584 struct lttng_id_tracker_rcu {
 585         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 586 };
 587
 588 struct lttng_id_tracker {
 589         struct lttng_session *session;
 590         enum tracker_type tracker_type;
 591         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 592 };
 593
 594 struct lttng_id_hash_node {
 595         struct hlist_node hlist;
 596         int id;
 597 };
 598
 599 struct lttng_session {
 600         int active;                     /* Is trace session active ? */
 601         int been_active;                /* Has trace session been active ? */
 602         struct file *file;              /* File associated to session */
 603         struct list_head chan;          /* Channel list head */
 604         struct list_head events;        /* Event list head */
 605         struct list_head list;          /* Session list */
 606         unsigned int free_chan_id;      /* Next chan ID to allocate */
 607         uuid_le uuid;                   /* Trace session unique ID */
 608         struct lttng_metadata_cache *metadata_cache;
 609         struct lttng_id_tracker pid_tracker;
 610         struct lttng_id_tracker vpid_tracker;
 611         struct lttng_id_tracker uid_tracker;
 612         struct lttng_id_tracker vuid_tracker;
 613         struct lttng_id_tracker gid_tracker;
 614         struct lttng_id_tracker vgid_tracker;
 615         unsigned int metadata_dumped:1,
 616                 tstate:1;               /* Transient enable state */
 617         /* List of event enablers */
 618         struct list_head enablers_head;
 619         /* Hash table of events */
 620         struct lttng_event_ht events_ht;
 621         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 622         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 623 };
 624
 625 struct lttng_event_notifier_group {
 626         struct file *file;              /* File associated to event notifier group */
 627         struct file *notif_file;        /* File used to expose notifications to userspace. */
 628         struct list_head node;          /* event notifier group list */
 629         struct list_head enablers_head; /* List of enablers */
 630         struct list_head event_notifiers_head; /* List of event notifier */
 631         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 632         struct lttng_ctx *ctx;          /* Contexts for filters. */
 633         struct lttng_channel_ops *ops;
 634         struct lttng_transport *transport;
 635         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 636         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 637         wait_queue_head_t read_wait;
 638         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 639
 640         struct list_head *event_notifier_syscall_dispatch;
 641         struct list_head *event_notifier_compat_syscall_dispatch;
 642
 643         unsigned int syscall_all:1,
 644                 sys_enter_registered:1;
 645 };
 646
 647 struct lttng_metadata_cache {
 648         char *data;                     /* Metadata cache */
 649         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 650         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 651         atomic_t producing;             /* Metadata being produced (incomplete) */
 652         struct kref refcount;           /* Metadata cache usage */
 653         struct list_head metadata_stream;       /* Metadata stream list */
 654         uuid_le uuid;                   /* Trace session unique ID (copy) */
 655         struct mutex lock;              /* Produce/consume lock */
 656         uint64_t version;               /* Current version of the metadata */
 657 };
 658
 659 void lttng_lock_sessions(void);
 660 void lttng_unlock_sessions(void);
 661
 662 struct list_head *lttng_get_probe_list_head(void);
 663
 664 struct lttng_event_enabler *lttng_event_enabler_create(
 665                 enum lttng_enabler_format_type format_type,
 666                 struct lttng_kernel_event *event_param,
 667                 struct lttng_channel *chan);
 668
 669 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 670 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 671 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 672                 struct lttng_event_notifier_group *event_notifier_group,
 673                 enum lttng_enabler_format_type format_type,
 674                 struct lttng_kernel_event_notifier *event_notifier_param);
 675
 676 int lttng_event_notifier_enabler_enable(
 677                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 678 int lttng_event_notifier_enabler_disable(
 679                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 680 int lttng_fix_pending_events(void);
 681 int lttng_fix_pending_event_notifiers(void);
 682 int lttng_session_active(void);
 683 bool lttng_event_notifier_active(void);
 684
 685 struct lttng_session *lttng_session_create(void);
 686 int lttng_session_enable(struct lttng_session *session);
 687 int lttng_session_disable(struct lttng_session *session);
 688 void lttng_session_destroy(struct lttng_session *session);
 689 int lttng_session_metadata_regenerate(struct lttng_session *session);
 690 int lttng_session_statedump(struct lttng_session *session);
 691 void metadata_cache_destroy(struct kref *kref);
 692
 693 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 694 void lttng_event_notifier_group_destroy(
 695                 struct lttng_event_notifier_group *event_notifier_group);
 696
 697 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 698                                        const char *transport_name,
 699                                        void *buf_addr,
 700                                        size_t subbuf_size, size_t num_subbuf,
 701                                        unsigned int switch_timer_interval,
 702                                        unsigned int read_timer_interval,
 703                                        enum channel_type channel_type);
 704 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 705                                        int overwrite, void *buf_addr,
 706                                        size_t subbuf_size, size_t num_subbuf,
 707                                        unsigned int switch_timer_interval,
 708                                        unsigned int read_timer_interval);
 709
 710 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 711 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 712                                 struct lttng_kernel_event *event_param,
 713                                 void *filter,
 714                                 const struct lttng_event_desc *event_desc,
 715                                 enum lttng_kernel_instrumentation itype);
 716 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 717                                 struct lttng_kernel_event *event_param,
 718                                 void *filter,
 719                                 const struct lttng_event_desc *event_desc,
 720                                 enum lttng_kernel_instrumentation itype);
 721 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 722                 struct lttng_kernel_old_event *old_event_param,
 723                 void *filter,
 724                 const struct lttng_event_desc *internal_desc);
 725
 726 struct lttng_event_notifier *lttng_event_notifier_create(
 727                                 const struct lttng_event_desc *event_notifier_desc,
 728                                 uint64_t id,
 729                                 struct lttng_event_notifier_group *event_notifier_group,
 730                                 struct lttng_kernel_event_notifier *event_notifier_param,
 731                                 void *filter,
 732                                 enum lttng_kernel_instrumentation itype);
 733 struct lttng_event_notifier *_lttng_event_notifier_create(
 734                                 const struct lttng_event_desc *event_notifier_desc,
 735                                 uint64_t id,
 736                                 struct lttng_event_notifier_group *event_notifier_group,
 737                                 struct lttng_kernel_event_notifier *event_notifier_param,
 738                                 void *filter,
 739                                 enum lttng_kernel_instrumentation itype);
 740
 741 int lttng_channel_enable(struct lttng_channel *channel);
 742 int lttng_channel_disable(struct lttng_channel *channel);
 743 int lttng_event_enable(struct lttng_event *event);
 744 int lttng_event_disable(struct lttng_event *event);
 745
 746 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 747 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 748
 749 void lttng_transport_register(struct lttng_transport *transport);
 750 void lttng_transport_unregister(struct lttng_transport *transport);
 751
 752 void synchronize_trace(void);
 753 int lttng_abi_init(void);
 754 int lttng_abi_compat_old_init(void);
 755 void lttng_abi_exit(void);
 756 void lttng_abi_compat_old_exit(void);
 757
 758 int lttng_probe_register(struct lttng_probe_desc *desc);
 759 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 760 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 761 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 762 int lttng_probes_init(void);
 763 void lttng_probes_exit(void);
 764
 765 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 766                 struct channel *chan, bool *coherent);
 767
 768 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 769 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 770 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 771 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 772 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 773 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 774
 775 int lttng_session_track_id(struct lttng_session *session,
 776                 enum tracker_type tracker_type, int id);
 777 int lttng_session_untrack_id(struct lttng_session *session,
 778                 enum tracker_type tracker_type, int id);
 779
 780 int lttng_session_list_tracker_ids(struct lttng_session *session,
 781                 enum tracker_type tracker_type);
 782
 783 void lttng_clock_ref(void);
 784 void lttng_clock_unref(void);
 785
 786 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 787                 struct lttng_enabler *enabler);
 788
 789 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 790 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 791 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 792 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 793 int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 794                 struct lttng_event *event);
 795 int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 796                 struct lttng_event *event);
 797 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 798                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 799
 800 int lttng_syscalls_register_event_notifier(
 801                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 802                 void *filter);
 803 int lttng_syscals_create_matching_event_notifiers(
 804                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 805 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 806 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 807 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 808 #else
 809 static inline int lttng_syscalls_register_event(
 810                 struct lttng_channel *chan, void *filter)
 811 {
 812         return -ENOSYS;
 813 }
 814
 815 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 816 {
 817         return 0;
 818 }
 819
 820 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 821 {
 822         return 0;
 823 }
 824
 825 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 826                 struct lttng_event *event);
 827 {
 828         return -ENOSYS;
 829 }
 830
 831 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 832                 struct lttng_event *event);
 833 {
 834         return -ENOSYS;
 835 }
 836
 837 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 838                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 839 {
 840         return -ENOSYS;
 841 }
 842
 843 static inline int lttng_syscalls_register_event_notifier(
 844                 struct lttng_event_notifier_group *group, void *filter)
 845 {
 846         return -ENOSYS;
 847 }
 848
 849 static inline int lttng_syscalls_unregister_event_notifier(
 850                 struct lttng_event_notifier_group *group)
 851 {
 852         return 0;
 853 }
 854
 855 static inline int lttng_syscall_filter_enable_event_notifier(
 856                 struct lttng_event_notifier_group *group,
 857                 const char *name)
 858 {
 859         return -ENOSYS;
 860 }
 861
 862 static inline int lttng_syscall_filter_disable_event_notifier(
 863                 struct lttng_event_notifier_group *group,
 864                 const char *name)
 865 {
 866         return -ENOSYS;
 867 }
 868
 869 #endif
 870
 871 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 872 int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler,
 873                 struct lttng_kernel_filter_bytecode __user *bytecode);
 874 int lttng_event_notifier_enabler_attach_bytecode(
 875                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 876                 struct lttng_kernel_filter_bytecode __user *bytecode);
 877
 878 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 879                 struct lttng_ctx *ctx,
 880                 struct list_head *bytecode_runtime_head,
 881                 struct lttng_enabler *enabler);
 882
 883 int lttng_probes_init(void);
 884
 885 extern struct lttng_ctx *lttng_static_ctx;
 886
 887 int lttng_context_init(void);
 888 void lttng_context_exit(void);
 889 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 890 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 891 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 892                 size_t index);
 893 void lttng_context_update(struct lttng_ctx *ctx);
 894 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 895 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 896 void lttng_remove_context_field(struct lttng_ctx **ctx,
 897                                 struct lttng_ctx_field *field);
 898 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 899 void lttng_destroy_context(struct lttng_ctx *ctx);
 900 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 901 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 902 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 903 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 904 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 905 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 906 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 907 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 908 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 909 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 910 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 911 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 912 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 913 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 914 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 915 #else
 916 static inline
 917 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 918 {
 919         return -ENOSYS;
 920 }
 921 #endif
 922 #ifdef CONFIG_PREEMPT_RT_FULL
 923 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 924 #else
 925 static inline
 926 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 927 {
 928         return -ENOSYS;
 929 }
 930 #endif
 931
 932 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 933
 934 #if defined(CONFIG_CGROUPS) && \
 935         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
 936          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 937 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 938 #else
 939 static inline
 940 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 941 {
 942         return -ENOSYS;
 943 }
 944 #endif
 945
 946 #if defined(CONFIG_IPC_NS) && \
 947         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 948 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 949 #else
 950 static inline
 951 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 952 {
 953         return -ENOSYS;
 954 }
 955 #endif
 956
 957 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 958         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 959 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 960 #else
 961 static inline
 962 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 963 {
 964         return -ENOSYS;
 965 }
 966 #endif
 967
 968 #if defined(CONFIG_NET_NS) && \
 969         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 970 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 971 #else
 972 static inline
 973 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
 974 {
 975         return -ENOSYS;
 976 }
 977 #endif
 978
 979 #if defined(CONFIG_PID_NS) && \
 980         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 981 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 982 #else
 983 static inline
 984 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
 985 {
 986         return -ENOSYS;
 987 }
 988 #endif
 989
 990 #if defined(CONFIG_USER_NS) && \
 991         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
 992 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 993 #else
 994 static inline
 995 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
 996 {
 997         return -ENOSYS;
 998 }
 999 #endif
1000
1001 #if defined(CONFIG_UTS_NS) && \
1002         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1003 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1004 #else
1005 static inline
1006 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1007 {
1008         return -ENOSYS;
1009 }
1010 #endif
1011
1012 #if defined(CONFIG_TIME_NS) && \
1013         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1014 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1015 #else
1016 static inline
1017 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1018 {
1019         return -ENOSYS;
1020 }
1021 #endif
1022
1023 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1024 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1025 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1026 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1027 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1028 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1029 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1030 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1031 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1032 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1033 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1034 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1035
1036 #if defined(CONFIG_PERF_EVENTS)
1037 int lttng_add_perf_counter_to_ctx(uint32_t type,
1038                                   uint64_t config,
1039                                   const char *name,
1040                                   struct lttng_ctx **ctx);
1041 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1042                 struct lttng_cpuhp_node *node);
1043 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1044                 struct lttng_cpuhp_node *node);
1045 #else
1046 static inline
1047 int lttng_add_perf_counter_to_ctx(uint32_t type,
1048                                   uint64_t config,
1049                                   const char *name,
1050                                   struct lttng_ctx **ctx)
1051 {
1052         return -ENOSYS;
1053 }
1054 static inline
1055 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1056                 struct lttng_cpuhp_node *node)
1057 {
1058         return 0;
1059 }
1060 static inline
1061 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1062                 struct lttng_cpuhp_node *node)
1063 {
1064         return 0;
1065 }
1066 #endif
1067
1068 int lttng_logger_init(void);
1069 void lttng_logger_exit(void);
1070
1071 extern int lttng_statedump_start(struct lttng_session *session);
1072
1073 #ifdef CONFIG_KPROBES
1074 int lttng_kprobes_register_event(const char *name,
1075                 const char *symbol_name,
1076                 uint64_t offset,
1077                 uint64_t addr,
1078                 struct lttng_event *event);
1079 void lttng_kprobes_unregister_event(struct lttng_event *event);
1080 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1081 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1082                 uint64_t offset,
1083                 uint64_t addr,
1084                 struct lttng_event_notifier *event_notifier);
1085 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1086 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1087 #else
1088 static inline
1089 int lttng_kprobes_register_event(const char *name,
1090                 const char *symbol_name,
1091                 uint64_t offset,
1092                 uint64_t addr,
1093                 struct lttng_event *event)
1094 {
1095         return -ENOSYS;
1096 }
1097
1098 static inline
1099 void lttng_kprobes_unregister_event(struct lttng_event *event)
1100 {
1101 }
1102
1103 static inline
1104 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1105 {
1106 }
1107
1108 static inline
1109 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1110                 uint64_t offset,
1111                 uint64_t addr,
1112                 struct lttng_event_notifier *event_notifier)
1113 {
1114         return -ENOSYS;
1115 }
1116
1117 static inline
1118 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1119 {
1120 }
1121
1122 static inline
1123 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1124 {
1125 }
1126 #endif
1127
1128 int lttng_event_add_callsite(struct lttng_event *event,
1129         struct lttng_kernel_event_callsite *callsite);
1130
1131 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1132         struct lttng_kernel_event_callsite *callsite);
1133
1134 #ifdef CONFIG_UPROBES
1135 int lttng_uprobes_register_event(const char *name,
1136         int fd, struct lttng_event *event);
1137 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1138         struct lttng_kernel_event_callsite *callsite);
1139 void lttng_uprobes_unregister_event(struct lttng_event *event);
1140 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1141 int lttng_uprobes_register_event_notifier(const char *name,
1142         int fd, struct lttng_event_notifier *event_notifier);
1143 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1144         struct lttng_kernel_event_callsite *callsite);
1145 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1146 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1147 #else
1148 static inline
1149 int lttng_uprobes_register_event(const char *name,
1150         int fd, struct lttng_event *event)
1151 {
1152         return -ENOSYS;
1153 }
1154
1155 static inline
1156 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1157         struct lttng_kernel_event_callsite *callsite)
1158 {
1159         return -ENOSYS;
1160 }
1161
1162 static inline
1163 void lttng_uprobes_unregister_event(struct lttng_event *event)
1164 {
1165 }
1166
1167 static inline
1168 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1169 {
1170 }
1171
1172 static inline
1173 int lttng_uprobes_register_event_notifier(const char *name,
1174         int fd, struct lttng_event_notifier *event_notifier)
1175 {
1176         return -ENOSYS;
1177 }
1178
1179 static inline
1180 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1181         struct lttng_kernel_event_callsite *callsite)
1182 {
1183         return -ENOSYS;
1184 }
1185
1186 static inline
1187 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1188 {
1189 }
1190
1191 static inline
1192 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1193 {
1194 }
1195 #endif
1196
1197 #ifdef CONFIG_KRETPROBES
1198 int lttng_kretprobes_register(const char *name,
1199                 const char *symbol_name,
1200                 uint64_t offset,
1201                 uint64_t addr,
1202                 struct lttng_event *event_entry,
1203                 struct lttng_event *event_exit);
1204 void lttng_kretprobes_unregister(struct lttng_event *event);
1205 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1206 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1207         int enable);
1208 #else
1209 static inline
1210 int lttng_kretprobes_register(const char *name,
1211                 const char *symbol_name,
1212                 uint64_t offset,
1213                 uint64_t addr,
1214                 struct lttng_event *event_entry,
1215                 struct lttng_event *event_exit)
1216 {
1217         return -ENOSYS;
1218 }
1219
1220 static inline
1221 void lttng_kretprobes_unregister(struct lttng_event *event)
1222 {
1223 }
1224
1225 static inline
1226 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1227 {
1228 }
1229
1230 static inline
1231 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1232         int enable)
1233 {
1234         return -ENOSYS;
1235 }
1236 #endif
1237
1238 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1239
1240 extern const struct file_operations lttng_tracepoint_list_fops;
1241 extern const struct file_operations lttng_syscall_list_fops;
1242
1243 #define TRACEPOINT_HAS_DATA_ARG
1244
1245 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1246 {
1247         if (type->atype != atype_integer)
1248                 return false;
1249         switch (type->u.integer.size) {
1250         case 8:         /* Fall-through. */
1251         case 16:        /* Fall-through. */
1252         case 32:        /* Fall-through. */
1253         case 64:
1254                 break;
1255         default:
1256                 return false;
1257         }
1258         return true;
1259 }
1260
1261 #endif /* _LTTNG_EVENTS_H */