include/lttng/events.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <linux/version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <linux/uuid.h>
  18 #include <linux/irq_work.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng/cpuhotplug.h>
  21 #include <lttng/tracer.h>
  22 #include <lttng/abi.h>
  23 #include <lttng/abi-old.h>
  24 #include <lttng/endian.h>
  25
  26 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lib_ring_buffer_ctx;
  32 struct perf_event;
  33 struct perf_event_attr;
  34 struct lib_ring_buffer_config;
  35
  36 /* Type description */
  37
  38 enum abstract_types {
  39         atype_integer,
  40         atype_string,
  41         atype_enum_nestable,
  42         atype_array_nestable,
  43         atype_sequence_nestable,
  44         atype_struct_nestable,
  45         atype_variant_nestable,
  46         NR_ABSTRACT_TYPES,
  47 };
  48
  49 enum lttng_string_encodings {
  50         lttng_encode_none = 0,
  51         lttng_encode_UTF8 = 1,
  52         lttng_encode_ASCII = 2,
  53         NR_STRING_ENCODINGS,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_enum_entry {
  67         struct lttng_enum_value start, end;     /* start and end are inclusive */
  68         const char *string;
  69         struct {
  70                 unsigned int is_auto:1;
  71         } options;
  72 };
  73
  74 #define __type_integer(_type, _size, _alignment, _signedness,   \
  75                 _byte_order, _base, _encoding)  \
  76         {                                                       \
  77             .atype = atype_integer,                             \
  78             .u.integer =                                        \
  79                 {                                               \
  80                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  81                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  82                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  83                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  84                   .base = _base,                                \
  85                   .encoding = lttng_encode_##_encoding,         \
  86                 },                                              \
  87         }                                                       \
  88
  89 struct lttng_integer_type {
  90         unsigned int size;              /* in bits */
  91         unsigned short alignment;       /* in bits */
  92         unsigned int signedness:1,
  93                 reverse_byte_order:1;
  94         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  95         enum lttng_string_encodings encoding;
  96 };
  97
  98 struct lttng_type {
  99         enum abstract_types atype;
 100         union {
 101                 struct lttng_integer_type integer;
 102                 struct {
 103                         enum lttng_string_encodings encoding;
 104                 } string;
 105                 struct {
 106                         const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 107                         const struct lttng_type *container_type;
 108                 } enum_nestable;
 109                 struct {
 110                         const struct lttng_type *elem_type;
 111                         unsigned int length;                    /* Num. elems. */
 112                         unsigned int alignment;
 113                 } array_nestable;
 114                 struct {
 115                         const char *length_name;                /* Length field name. */
 116                         const struct lttng_type *elem_type;
 117                         unsigned int alignment;                 /* Alignment before elements. */
 118                 } sequence_nestable;
 119                 struct {
 120                         unsigned int nr_fields;
 121                         const struct lttng_event_field *fields; /* Array of fields. */
 122                         unsigned int alignment;
 123                 } struct_nestable;
 124                 struct {
 125                         const char *tag_name;
 126                         const struct lttng_event_field *choices; /* Array of fields. */
 127                         unsigned int nr_choices;
 128                         unsigned int alignment;
 129                 } variant_nestable;
 130         } u;
 131 };
 132
 133 struct lttng_enum_desc {
 134         const char *name;
 135         const struct lttng_enum_entry *entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_event_field {
 142         const char *name;
 143         struct lttng_type type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1,         /* fetch from user-space */
 146                         nofilter:1;     /* do not consider for filter */
 147 };
 148
 149 union lttng_ctx_value {
 150         int64_t s64;
 151         const char *str;
 152         double d;
 153 };
 154
 155 /*
 156  * We need to keep this perf counter field separately from struct
 157  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 158  */
 159 struct lttng_perf_counter_field {
 160 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 161         struct lttng_cpuhp_node cpuhp_prepare;
 162         struct lttng_cpuhp_node cpuhp_online;
 163 #else
 164         struct notifier_block nb;
 165         int hp_enable;
 166 #endif
 167         struct perf_event_attr *attr;
 168         struct perf_event **e;  /* per-cpu array */
 169 };
 170
 171 struct lttng_probe_ctx {
 172         struct lttng_event *event;
 173         struct lttng_event_notifier *event_notifier; // Not sure if we will ever need it.
 174         uint8_t interruptible;
 175 };
 176
 177 struct lttng_ctx_field {
 178         struct lttng_event_field event_field;
 179         size_t (*get_size)(size_t offset);
 180         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 181                                struct lib_ring_buffer_ctx *ctx,
 182                                struct lttng_channel *chan);
 183         void (*record)(struct lttng_ctx_field *field,
 184                        struct lib_ring_buffer_ctx *ctx,
 185                        struct lttng_channel *chan);
 186         void (*get_value)(struct lttng_ctx_field *field,
 187                          struct lttng_probe_ctx *lttng_probe_ctx,
 188                          union lttng_ctx_value *value);
 189         union {
 190                 struct lttng_perf_counter_field *perf_counter;
 191         } u;
 192         void (*destroy)(struct lttng_ctx_field *field);
 193         /*
 194          * Private data to keep state between get_size and record.
 195          * User must perform its own synchronization to protect against
 196          * concurrent and reentrant contexts.
 197          */
 198         void *priv;
 199 };
 200
 201 struct lttng_ctx {
 202         struct lttng_ctx_field *fields;
 203         unsigned int nr_fields;
 204         unsigned int allocated_fields;
 205         size_t largest_align;   /* in bytes */
 206 };
 207
 208 struct lttng_event_desc {
 209         const char *name;               /* lttng-modules name */
 210         const char *kname;              /* Linux kernel name (tracepoints) */
 211         void *probe_callback;
 212         const struct lttng_event_ctx *ctx;      /* context */
 213         const struct lttng_event_field *fields; /* event payload */
 214         unsigned int nr_fields;
 215         struct module *owner;
 216         void *event_notifier_callback;
 217 };
 218
 219 struct lttng_probe_desc {
 220         const char *provider;
 221         const struct lttng_event_desc **event_desc;
 222         unsigned int nr_events;
 223         struct list_head head;                  /* chain registered probes */
 224         struct list_head lazy_init_head;
 225         int lazy;                               /* lazy registration */
 226 };
 227
 228 struct lttng_krp;                               /* Kretprobe handling */
 229
 230 enum lttng_event_type {
 231         LTTNG_TYPE_EVENT = 0,
 232         LTTNG_TYPE_ENABLER = 1,
 233 };
 234
 235 enum lttng_bytecode_node_type {
 236         LTTNG_BYTECODE_NODE_TYPE_FILTER,
 237         LTTNG_BYTECODE_NODE_TYPE_CAPTURE,
 238 };
 239
 240 struct lttng_bytecode_node {
 241         enum lttng_bytecode_node_type type;
 242         struct list_head node;
 243         struct lttng_enabler *enabler;
 244         struct {
 245                 uint32_t len;
 246                 uint32_t reloc_offset;
 247                 uint64_t seqnum;
 248                 char data[];
 249         } bc;
 250 };
 251
 252 /*
 253  * Bytecode interpreter return value masks.
 254  */
 255 enum lttng_bytecode_interpreter_ret {
 256         LTTNG_INTERPRETER_DISCARD = 0,
 257         LTTNG_INTERPRETER_RECORD_FLAG = (1ULL << 0),
 258         /* Other bits are kept for future use. */
 259 };
 260
 261 struct lttng_interpreter_output;
 262
 263 struct lttng_bytecode_runtime {
 264         /* Associated bytecode */
 265         struct lttng_bytecode_node *bc;
 266         union {
 267                 uint64_t (*filter)(void *filter_data,
 268                                 struct lttng_probe_ctx *lttng_probe_ctx,
 269                                 const char *filter_stack_data);
 270                 uint64_t (*capture)(void *filter_data,
 271                                 struct lttng_probe_ctx *lttng_probe_ctx,
 272                                 const char *capture_stack_data,
 273                                 struct lttng_interpreter_output *output);
 274         } interpreter_funcs;
 275         int link_failed;
 276         struct list_head node;  /* list of bytecode runtime in event */
 277         struct lttng_ctx *ctx;
 278 };
 279
 280 /*
 281  * Objects in a linked-list of enablers, owned by an event.
 282  */
 283 struct lttng_enabler_ref {
 284         struct list_head node;                  /* enabler ref list */
 285         struct lttng_enabler *ref;              /* backward ref */
 286 };
 287
 288 struct lttng_uprobe_handler {
 289         union {
 290                 struct lttng_event *event;
 291                 struct lttng_event_notifier *event_notifier;
 292         } u;
 293         loff_t offset;
 294         struct uprobe_consumer up_consumer;
 295         struct list_head node;
 296 };
 297
 298 struct lttng_kprobe {
 299         struct kprobe kp;
 300         char *symbol_name;
 301 };
 302
 303 struct lttng_uprobe {
 304         struct inode *inode;
 305         struct list_head head;
 306 };
 307
 308 enum lttng_syscall_entryexit {
 309         LTTNG_SYSCALL_ENTRY,
 310         LTTNG_SYSCALL_EXIT,
 311 };
 312
 313 enum lttng_syscall_abi {
 314         LTTNG_SYSCALL_ABI_NATIVE,
 315         LTTNG_SYSCALL_ABI_COMPAT,
 316 };
 317
 318 /*
 319  * lttng_event structure is referred to by the tracing fast path. It must be
 320  * kept small.
 321  */
 322 struct lttng_event {
 323         enum lttng_event_type evtype;   /* First field. */
 324         unsigned int id;
 325         struct lttng_channel *chan;
 326         int enabled;
 327         const struct lttng_event_desc *desc;
 328         void *filter;
 329         struct lttng_ctx *ctx;
 330         enum lttng_kernel_instrumentation instrumentation;
 331         union {
 332                 struct lttng_kprobe kprobe;
 333                 struct {
 334                         struct lttng_krp *lttng_krp;
 335                         char *symbol_name;
 336                 } kretprobe;
 337                 struct lttng_uprobe uprobe;
 338                 struct {
 339                         enum lttng_syscall_entryexit entryexit;
 340                         enum lttng_syscall_abi abi;
 341                 } syscall;
 342         } u;
 343         struct list_head list;          /* Event list in session */
 344         unsigned int metadata_dumped:1;
 345
 346         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 347         struct list_head enablers_ref_head;
 348         struct hlist_node hlist;        /* session ht of events */
 349         int registered;                 /* has reg'd tracepoint probe */
 350         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 351         struct list_head filter_bytecode_runtime_head;
 352         int has_enablers_without_bytecode;
 353 };
 354
 355 // FIXME: Really similar to lttng_event above. Could those be merged ?
 356 struct lttng_event_notifier {
 357         enum lttng_event_type evtype;   /* First field. */
 358         uint64_t user_token;
 359         uint64_t error_counter_index;
 360         int enabled;
 361         int registered;                 /* has reg'd tracepoint probe */
 362         const struct lttng_event_desc *desc;
 363         void *filter;
 364         struct list_head list;          /* event_notifier list in event_notifier group */
 365
 366         enum lttng_kernel_instrumentation instrumentation;
 367         union {
 368                 struct lttng_kprobe kprobe;
 369                 struct lttng_uprobe uprobe;
 370                 struct {
 371                         enum lttng_syscall_entryexit entryexit;
 372                         enum lttng_syscall_abi abi;
 373                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 374                         unsigned int syscall_id;
 375                 } syscall;
 376
 377         } u;
 378
 379         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 380         struct list_head enablers_ref_head;
 381         struct hlist_node hlist;        /* session ht of event_notifiers */
 382         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 383         struct list_head filter_bytecode_runtime_head;
 384         size_t num_captures;
 385         struct list_head capture_bytecode_runtime_head;
 386         int has_enablers_without_bytecode;
 387
 388         void (*send_notification)(struct lttng_event_notifier *event_notifier,
 389                         struct lttng_probe_ctx *lttng_probe_ctx,
 390                         const char *interpreter_stack_data);
 391         struct lttng_event_notifier_group *group; /* Weak ref */
 392 };
 393
 394 enum lttng_enabler_format_type {
 395         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 396         LTTNG_ENABLER_FORMAT_NAME,
 397 };
 398
 399 /*
 400  * Enabler field, within whatever object is enabling an event. Target of
 401  * backward reference.
 402  */
 403 struct lttng_enabler {
 404         enum lttng_event_type evtype;   /* First field. */
 405
 406         enum lttng_enabler_format_type format_type;
 407
 408         /* head list of struct lttng_bytecode_node */
 409         struct list_head filter_bytecode_head;
 410
 411         struct lttng_kernel_event event_param;
 412         unsigned int enabled:1;
 413
 414         uint64_t user_token;            /* User-provided token. */
 415 };
 416
 417 struct lttng_event_enabler {
 418         struct lttng_enabler base;
 419         struct list_head node;  /* per-session list of enablers */
 420         struct lttng_channel *chan;
 421         /*
 422          * Unused, but kept around to make it explicit that the tracer can do
 423          * it.
 424          */
 425         struct lttng_ctx *ctx;
 426 };
 427
 428 struct lttng_event_notifier_enabler {
 429         struct lttng_enabler base;
 430         uint64_t error_counter_index;
 431         struct list_head node;  /* List of event_notifier enablers */
 432         struct lttng_event_notifier_group *group;
 433
 434         /* head list of struct lttng_bytecode_node */
 435         struct list_head capture_bytecode_head;
 436         uint64_t num_captures;
 437 };
 438
 439
 440 static inline
 441 struct lttng_enabler *lttng_event_enabler_as_enabler(
 442                 struct lttng_event_enabler *event_enabler)
 443 {
 444         return &event_enabler->base;
 445 }
 446
 447 static inline
 448 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 449                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 450 {
 451         return &event_notifier_enabler->base;
 452 }
 453
 454 struct lttng_channel_ops {
 455         struct channel *(*channel_create)(const char *name,
 456                                 void *priv,
 457                                 void *buf_addr,
 458                                 size_t subbuf_size, size_t num_subbuf,
 459                                 unsigned int switch_timer_interval,
 460                                 unsigned int read_timer_interval);
 461         void (*channel_destroy)(struct channel *chan);
 462         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 463         int (*buffer_has_read_closed_stream)(struct channel *chan);
 464         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 465         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 466                              uint32_t event_id);
 467         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 468         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 469                             size_t len);
 470         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 471                                       const void *src, size_t len);
 472         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 473                              int c, size_t len);
 474         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 475                              size_t len);
 476         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 477                                        const char __user *src, size_t len);
 478         /*
 479          * packet_avail_size returns the available size in the current
 480          * packet. Note that the size returned is only a hint, since it
 481          * may change due to concurrent writes.
 482          */
 483         size_t (*packet_avail_size)(struct channel *chan);
 484         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 485         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 486         int (*is_finalized)(struct channel *chan);
 487         int (*is_disabled)(struct channel *chan);
 488         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 489                         struct lib_ring_buffer *bufb,
 490                         uint64_t *timestamp_begin);
 491         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 492                         struct lib_ring_buffer *bufb,
 493                         uint64_t *timestamp_end);
 494         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 495                         struct lib_ring_buffer *bufb,
 496                         uint64_t *events_discarded);
 497         int (*content_size) (const struct lib_ring_buffer_config *config,
 498                         struct lib_ring_buffer *bufb,
 499                         uint64_t *content_size);
 500         int (*packet_size) (const struct lib_ring_buffer_config *config,
 501                         struct lib_ring_buffer *bufb,
 502                         uint64_t *packet_size);
 503         int (*stream_id) (const struct lib_ring_buffer_config *config,
 504                         struct lib_ring_buffer *bufb,
 505                         uint64_t *stream_id);
 506         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 507                         struct lib_ring_buffer *bufb,
 508                         uint64_t *ts);
 509         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 510                         struct lib_ring_buffer *bufb,
 511                         uint64_t *seq);
 512         int (*instance_id) (const struct lib_ring_buffer_config *config,
 513                         struct lib_ring_buffer *bufb,
 514                         uint64_t *id);
 515 };
 516
 517 struct lttng_counter_ops {
 518         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 519                         const size_t *max_nr_elem,      /* for each dimension */
 520                         int64_t global_sum_step);
 521         void (*counter_destroy)(struct lib_counter *counter);
 522         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 523                         int64_t v);
 524         /*
 525          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 526          * the global aggregation counter if @cpu == -1.
 527          */
 528         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 529                          int64_t *value, bool *overflow, bool *underflow);
 530         /*
 531          * counter_aggregate returns the total sum of all per-cpu counters and
 532          * the global aggregation counter.
 533          */
 534         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 535                         int64_t *value, bool *overflow, bool *underflow);
 536         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 537 };
 538
 539 struct lttng_transport {
 540         char *name;
 541         struct module *owner;
 542         struct list_head node;
 543         struct lttng_channel_ops ops;
 544 };
 545
 546 struct lttng_counter_transport {
 547         char *name;
 548         struct module *owner;
 549         struct list_head node;
 550         struct lttng_counter_ops ops;
 551 };
 552
 553 struct lttng_syscall_filter;
 554
 555 #define LTTNG_EVENT_HT_BITS             12
 556 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 557
 558 struct lttng_event_ht {
 559         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 560 };
 561
 562 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 563 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 564
 565 struct lttng_event_notifier_ht {
 566         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 567 };
 568
 569 struct lttng_channel {
 570         unsigned int id;
 571         struct channel *chan;           /* Channel buffers */
 572         int enabled;
 573         struct lttng_ctx *ctx;
 574         /* Event ID management */
 575         struct lttng_session *session;
 576         struct file *file;              /* File associated to channel */
 577         unsigned int free_event_id;     /* Next event ID to allocate */
 578         struct list_head list;          /* Channel list */
 579         struct lttng_channel_ops *ops;
 580         struct lttng_transport *transport;
 581         struct lttng_event **sc_table;  /* for syscall tracing */
 582         struct lttng_event **compat_sc_table;
 583         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 584         struct lttng_event **compat_sc_exit_table;
 585         struct lttng_event *sc_unknown; /* for unknown syscalls */
 586         struct lttng_event *sc_compat_unknown;
 587         struct lttng_event *sc_exit_unknown;
 588         struct lttng_event *compat_sc_exit_unknown;
 589         struct lttng_syscall_filter *sc_filter;
 590         int header_type;                /* 0: unset, 1: compact, 2: large */
 591         enum channel_type channel_type;
 592         int syscall_all;
 593         unsigned int metadata_dumped:1,
 594                 sys_enter_registered:1,
 595                 sys_exit_registered:1,
 596                 tstate:1;               /* Transient enable state */
 597 };
 598
 599 struct lttng_metadata_stream {
 600         void *priv;                     /* Ring buffer private data */
 601         struct lttng_metadata_cache *metadata_cache;
 602         unsigned int metadata_in;       /* Bytes read from the cache */
 603         unsigned int metadata_out;      /* Bytes consumed from stream */
 604         int finalized;                  /* Has channel been finalized */
 605         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 606         struct list_head list;          /* Stream list */
 607         struct lttng_transport *transport;
 608         uint64_t version;               /* Current version of the metadata cache */
 609         bool coherent;                  /* Stream in a coherent state */
 610 };
 611
 612 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 613
 614 struct lttng_dynamic_len_stack {
 615         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 616         size_t offset;
 617 };
 618
 619 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 620
 621 /*
 622  * struct lttng_id_tracker declared in header due to deferencing of *v
 623  * in RCU_INITIALIZER(v).
 624  */
 625 #define LTTNG_ID_HASH_BITS      6
 626 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 627
 628 enum tracker_type {
 629         TRACKER_PID,
 630         TRACKER_VPID,
 631         TRACKER_UID,
 632         TRACKER_VUID,
 633         TRACKER_GID,
 634         TRACKER_VGID,
 635
 636         TRACKER_UNKNOWN,
 637 };
 638
 639 struct lttng_id_tracker_rcu {
 640         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 641 };
 642
 643 struct lttng_id_tracker {
 644         struct lttng_session *session;
 645         enum tracker_type tracker_type;
 646         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 647 };
 648
 649 struct lttng_id_hash_node {
 650         struct hlist_node hlist;
 651         int id;
 652 };
 653
 654 struct lttng_session {
 655         int active;                     /* Is trace session active ? */
 656         int been_active;                /* Has trace session been active ? */
 657         struct file *file;              /* File associated to session */
 658         struct list_head chan;          /* Channel list head */
 659         struct list_head events;        /* Event list head */
 660         struct list_head list;          /* Session list */
 661         unsigned int free_chan_id;      /* Next chan ID to allocate */
 662         uuid_le uuid;                   /* Trace session unique ID */
 663         struct lttng_metadata_cache *metadata_cache;
 664         struct lttng_id_tracker pid_tracker;
 665         struct lttng_id_tracker vpid_tracker;
 666         struct lttng_id_tracker uid_tracker;
 667         struct lttng_id_tracker vuid_tracker;
 668         struct lttng_id_tracker gid_tracker;
 669         struct lttng_id_tracker vgid_tracker;
 670         unsigned int metadata_dumped:1,
 671                 tstate:1;               /* Transient enable state */
 672         /* List of event enablers */
 673         struct list_head enablers_head;
 674         /* Hash table of events */
 675         struct lttng_event_ht events_ht;
 676         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 677         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 678 };
 679
 680 struct lttng_counter {
 681         struct file *file;              /* File associated to counter. */
 682         struct file *owner;
 683         struct lttng_counter_transport *transport;
 684         struct lib_counter *counter;
 685         struct lttng_counter_ops *ops;
 686 };
 687
 688 struct lttng_event_notifier_group {
 689         struct file *file;              /* File associated to event notifier group */
 690         struct file *notif_file;        /* File used to expose notifications to userspace. */
 691         struct list_head node;          /* event notifier group list */
 692         struct list_head enablers_head; /* List of enablers */
 693         struct list_head event_notifiers_head; /* List of event notifier */
 694         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 695         struct lttng_ctx *ctx;          /* Contexts for filters. */
 696         struct lttng_channel_ops *ops;
 697         struct lttng_transport *transport;
 698         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 699         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 700         wait_queue_head_t read_wait;
 701         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 702         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 703         struct lttng_event_notifier *sc_compat_unknown;
 704
 705         struct lttng_syscall_filter *sc_filter;
 706
 707         struct hlist_head *event_notifier_syscall_dispatch;
 708         struct hlist_head *event_notifier_compat_syscall_dispatch;
 709         struct hlist_head *event_notifier_exit_syscall_dispatch;
 710         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 711
 712         struct hlist_head event_notifier_unknown_syscall_dispatch;
 713         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 714         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 715         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 716
 717         int syscall_all_entry;
 718         int syscall_all_exit;
 719
 720         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 721
 722         struct lttng_counter *error_counter;
 723         size_t error_counter_len;
 724 };
 725
 726 struct lttng_metadata_cache {
 727         char *data;                     /* Metadata cache */
 728         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 729         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 730         atomic_t producing;             /* Metadata being produced (incomplete) */
 731         struct kref refcount;           /* Metadata cache usage */
 732         struct list_head metadata_stream;       /* Metadata stream list */
 733         uuid_le uuid;                   /* Trace session unique ID (copy) */
 734         struct mutex lock;              /* Produce/consume lock */
 735         uint64_t version;               /* Current version of the metadata */
 736 };
 737
 738 void lttng_lock_sessions(void);
 739 void lttng_unlock_sessions(void);
 740
 741 struct list_head *lttng_get_probe_list_head(void);
 742
 743 struct lttng_event_enabler *lttng_event_enabler_create(
 744                 enum lttng_enabler_format_type format_type,
 745                 struct lttng_kernel_event *event_param,
 746                 struct lttng_channel *chan);
 747
 748 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 749 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 750 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 751                 struct lttng_event_notifier_group *event_notifier_group,
 752                 enum lttng_enabler_format_type format_type,
 753                 struct lttng_kernel_event_notifier *event_notifier_param);
 754
 755 int lttng_event_notifier_enabler_enable(
 756                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 757 int lttng_event_notifier_enabler_disable(
 758                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 759 int lttng_fix_pending_events(void);
 760 int lttng_fix_pending_event_notifiers(void);
 761 int lttng_session_active(void);
 762 bool lttng_event_notifier_active(void);
 763
 764 struct lttng_session *lttng_session_create(void);
 765 int lttng_session_enable(struct lttng_session *session);
 766 int lttng_session_disable(struct lttng_session *session);
 767 void lttng_session_destroy(struct lttng_session *session);
 768 int lttng_session_metadata_regenerate(struct lttng_session *session);
 769 int lttng_session_statedump(struct lttng_session *session);
 770 void metadata_cache_destroy(struct kref *kref);
 771
 772 struct lttng_counter *lttng_kernel_counter_create(
 773                 const char *counter_transport_name, size_t number_dimensions,
 774                 const size_t *dimensions_sizes);
 775 int lttng_kernel_counter_read(struct lttng_counter *counter,
 776                 const size_t *dimension_indexes, int32_t cpu,
 777                 int64_t *val, bool *overflow, bool *underflow);
 778 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
 779                 const size_t *dimension_indexes, int64_t *val,
 780                 bool *overflow, bool *underflow);
 781 int lttng_kernel_counter_clear(struct lttng_counter *counter,
 782                 const size_t *dimension_indexes);
 783
 784
 785 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 786 int lttng_event_notifier_group_create_error_counter(
 787                 struct file *event_notifier_group_file,
 788                 const struct lttng_kernel_counter_conf *error_counter_conf);
 789 void lttng_event_notifier_group_destroy(
 790                 struct lttng_event_notifier_group *event_notifier_group);
 791
 792 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 793                                        const char *transport_name,
 794                                        void *buf_addr,
 795                                        size_t subbuf_size, size_t num_subbuf,
 796                                        unsigned int switch_timer_interval,
 797                                        unsigned int read_timer_interval,
 798                                        enum channel_type channel_type);
 799 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 800                                        int overwrite, void *buf_addr,
 801                                        size_t subbuf_size, size_t num_subbuf,
 802                                        unsigned int switch_timer_interval,
 803                                        unsigned int read_timer_interval);
 804
 805 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 806 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 807                                 struct lttng_kernel_event *event_param,
 808                                 void *filter,
 809                                 const struct lttng_event_desc *event_desc,
 810                                 enum lttng_kernel_instrumentation itype);
 811 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 812                                 struct lttng_kernel_event *event_param,
 813                                 void *filter,
 814                                 const struct lttng_event_desc *event_desc,
 815                                 enum lttng_kernel_instrumentation itype);
 816 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 817                 struct lttng_kernel_old_event *old_event_param,
 818                 void *filter,
 819                 const struct lttng_event_desc *internal_desc);
 820
 821 struct lttng_event_notifier *lttng_event_notifier_create(
 822                                 const struct lttng_event_desc *event_notifier_desc,
 823                                 uint64_t id,
 824                                 uint64_t error_counter_idx,
 825                                 struct lttng_event_notifier_group *event_notifier_group,
 826                                 struct lttng_kernel_event_notifier *event_notifier_param,
 827                                 void *filter,
 828                                 enum lttng_kernel_instrumentation itype);
 829 struct lttng_event_notifier *_lttng_event_notifier_create(
 830                                 const struct lttng_event_desc *event_notifier_desc,
 831                                 uint64_t id,
 832                                 uint64_t error_counter_idx,
 833                                 struct lttng_event_notifier_group *event_notifier_group,
 834                                 struct lttng_kernel_event_notifier *event_notifier_param,
 835                                 void *filter,
 836                                 enum lttng_kernel_instrumentation itype);
 837
 838 int lttng_channel_enable(struct lttng_channel *channel);
 839 int lttng_channel_disable(struct lttng_channel *channel);
 840 int lttng_event_enable(struct lttng_event *event);
 841 int lttng_event_disable(struct lttng_event *event);
 842
 843 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 844 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 845
 846 void lttng_transport_register(struct lttng_transport *transport);
 847 void lttng_transport_unregister(struct lttng_transport *transport);
 848
 849 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
 850 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
 851
 852 void synchronize_trace(void);
 853 int lttng_abi_init(void);
 854 int lttng_abi_compat_old_init(void);
 855 void lttng_abi_exit(void);
 856 void lttng_abi_compat_old_exit(void);
 857
 858 int lttng_probe_register(struct lttng_probe_desc *desc);
 859 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 860 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 861 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 862 int lttng_probes_init(void);
 863 void lttng_probes_exit(void);
 864
 865 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 866                 struct channel *chan, bool *coherent);
 867
 868 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 869 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 870 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 871 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 872 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 873 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 874
 875 int lttng_session_track_id(struct lttng_session *session,
 876                 enum tracker_type tracker_type, int id);
 877 int lttng_session_untrack_id(struct lttng_session *session,
 878                 enum tracker_type tracker_type, int id);
 879
 880 int lttng_session_list_tracker_ids(struct lttng_session *session,
 881                 enum tracker_type tracker_type);
 882
 883 void lttng_clock_ref(void);
 884 void lttng_clock_unref(void);
 885
 886 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 887                 struct lttng_enabler *enabler);
 888
 889 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 890 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 891 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 892 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 893 int lttng_syscall_filter_enable_event(
 894                 struct lttng_channel *chan,
 895                 struct lttng_event *event);
 896 int lttng_syscall_filter_disable_event(
 897                 struct lttng_channel *chan,
 898                 struct lttng_event *event);
 899
 900 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 901                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 902
 903 int lttng_syscalls_register_event_notifier(
 904                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 905                 void *filter);
 906 int lttng_syscals_create_matching_event_notifiers(
 907                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 908 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 909 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 910 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 911 #else
 912 static inline int lttng_syscalls_register_event(
 913                 struct lttng_channel *chan, void *filter)
 914 {
 915         return -ENOSYS;
 916 }
 917
 918 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 919 {
 920         return 0;
 921 }
 922
 923 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 924 {
 925         return 0;
 926 }
 927
 928 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 929                 struct lttng_event *event);
 930 {
 931         return -ENOSYS;
 932 }
 933
 934 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 935                 struct lttng_event *event);
 936 {
 937         return -ENOSYS;
 938 }
 939
 940 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 941                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 942 {
 943         return -ENOSYS;
 944 }
 945
 946 static inline int lttng_syscalls_register_event_notifier(
 947                 struct lttng_event_notifier_group *group, void *filter)
 948 {
 949         return -ENOSYS;
 950 }
 951
 952 static inline int lttng_syscalls_unregister_event_notifier(
 953                 struct lttng_event_notifier_group *group)
 954 {
 955         return 0;
 956 }
 957
 958 static inline int lttng_syscall_filter_enable_event_notifier(
 959                 struct lttng_event_notifier_group *group,
 960                 const char *name)
 961 {
 962         return -ENOSYS;
 963 }
 964
 965 static inline int lttng_syscall_filter_disable_event_notifier(
 966                 struct lttng_event_notifier_group *group,
 967                 const char *name)
 968 {
 969         return -ENOSYS;
 970 }
 971
 972 #endif
 973
 974 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 975                 struct lttng_kernel_filter_bytecode __user *bytecode);
 976 int lttng_event_notifier_enabler_attach_filter_bytecode(
 977                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 978                 struct lttng_kernel_filter_bytecode __user *bytecode);
 979 int lttng_event_notifier_enabler_attach_capture_bytecode(
 980                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 981                 struct lttng_kernel_capture_bytecode __user *bytecode);
 982
 983 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 984                 struct lttng_ctx *ctx,
 985                 struct list_head *instance_bytecode_runtime_head,
 986                 struct list_head *enabler_bytecode_runtime_head);
 987
 988 int lttng_probes_init(void);
 989
 990 extern struct lttng_ctx *lttng_static_ctx;
 991
 992 int lttng_context_init(void);
 993 void lttng_context_exit(void);
 994 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 995 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 996 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 997                 size_t index);
 998 void lttng_context_update(struct lttng_ctx *ctx);
 999 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
1000 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
1001 void lttng_remove_context_field(struct lttng_ctx **ctx,
1002                                 struct lttng_ctx_field *field);
1003 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
1004 void lttng_destroy_context(struct lttng_ctx *ctx);
1005 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
1006 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
1007 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
1008 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
1009 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
1010 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
1011 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
1012 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
1013 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
1014 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
1015 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
1016 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
1017 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
1018 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
1019 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
1020 #else
1021 static inline
1022 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
1023 {
1024         return -ENOSYS;
1025 }
1026 #endif
1027 #ifdef CONFIG_PREEMPT_RT_FULL
1028 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
1029 #else
1030 static inline
1031 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
1032 {
1033         return -ENOSYS;
1034 }
1035 #endif
1036
1037 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
1038
1039 #if defined(CONFIG_CGROUPS) && \
1040         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
1041          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
1042 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
1043 #else
1044 static inline
1045 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
1046 {
1047         return -ENOSYS;
1048 }
1049 #endif
1050
1051 #if defined(CONFIG_IPC_NS) && \
1052         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1053 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
1054 #else
1055 static inline
1056 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
1057 {
1058         return -ENOSYS;
1059 }
1060 #endif
1061
1062 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
1063         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1064 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
1065 #else
1066 static inline
1067 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
1068 {
1069         return -ENOSYS;
1070 }
1071 #endif
1072
1073 #if defined(CONFIG_NET_NS) && \
1074         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1075 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
1076 #else
1077 static inline
1078 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
1079 {
1080         return -ENOSYS;
1081 }
1082 #endif
1083
1084 #if defined(CONFIG_PID_NS) && \
1085         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1086 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1087 #else
1088 static inline
1089 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1090 {
1091         return -ENOSYS;
1092 }
1093 #endif
1094
1095 #if defined(CONFIG_USER_NS) && \
1096         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1097 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1098 #else
1099 static inline
1100 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1101 {
1102         return -ENOSYS;
1103 }
1104 #endif
1105
1106 #if defined(CONFIG_UTS_NS) && \
1107         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1108 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1109 #else
1110 static inline
1111 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1112 {
1113         return -ENOSYS;
1114 }
1115 #endif
1116
1117 #if defined(CONFIG_TIME_NS) && \
1118         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1119 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1120 #else
1121 static inline
1122 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1123 {
1124         return -ENOSYS;
1125 }
1126 #endif
1127
1128 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1129 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1130 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1131 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1132 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1133 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1134 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1135 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1136 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1137 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1138 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1139 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1140
1141 #if defined(CONFIG_PERF_EVENTS)
1142 int lttng_add_perf_counter_to_ctx(uint32_t type,
1143                                   uint64_t config,
1144                                   const char *name,
1145                                   struct lttng_ctx **ctx);
1146 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1147                 struct lttng_cpuhp_node *node);
1148 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1149                 struct lttng_cpuhp_node *node);
1150 #else
1151 static inline
1152 int lttng_add_perf_counter_to_ctx(uint32_t type,
1153                                   uint64_t config,
1154                                   const char *name,
1155                                   struct lttng_ctx **ctx)
1156 {
1157         return -ENOSYS;
1158 }
1159 static inline
1160 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1161                 struct lttng_cpuhp_node *node)
1162 {
1163         return 0;
1164 }
1165 static inline
1166 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1167                 struct lttng_cpuhp_node *node)
1168 {
1169         return 0;
1170 }
1171 #endif
1172
1173 int lttng_logger_init(void);
1174 void lttng_logger_exit(void);
1175
1176 extern int lttng_statedump_start(struct lttng_session *session);
1177
1178 #ifdef CONFIG_KPROBES
1179 int lttng_kprobes_register_event(const char *name,
1180                 const char *symbol_name,
1181                 uint64_t offset,
1182                 uint64_t addr,
1183                 struct lttng_event *event);
1184 void lttng_kprobes_unregister_event(struct lttng_event *event);
1185 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1186 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1187                 uint64_t offset,
1188                 uint64_t addr,
1189                 struct lttng_event_notifier *event_notifier);
1190 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1191 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1192 #else
1193 static inline
1194 int lttng_kprobes_register_event(const char *name,
1195                 const char *symbol_name,
1196                 uint64_t offset,
1197                 uint64_t addr,
1198                 struct lttng_event *event)
1199 {
1200         return -ENOSYS;
1201 }
1202
1203 static inline
1204 void lttng_kprobes_unregister_event(struct lttng_event *event)
1205 {
1206 }
1207
1208 static inline
1209 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1210 {
1211 }
1212
1213 static inline
1214 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1215                 uint64_t offset,
1216                 uint64_t addr,
1217                 struct lttng_event_notifier *event_notifier)
1218 {
1219         return -ENOSYS;
1220 }
1221
1222 static inline
1223 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1224 {
1225 }
1226
1227 static inline
1228 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1229 {
1230 }
1231 #endif
1232
1233 int lttng_event_add_callsite(struct lttng_event *event,
1234         struct lttng_kernel_event_callsite *callsite);
1235
1236 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1237         struct lttng_kernel_event_callsite *callsite);
1238
1239 #ifdef CONFIG_UPROBES
1240 int lttng_uprobes_register_event(const char *name,
1241         int fd, struct lttng_event *event);
1242 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1243         struct lttng_kernel_event_callsite *callsite);
1244 void lttng_uprobes_unregister_event(struct lttng_event *event);
1245 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1246 int lttng_uprobes_register_event_notifier(const char *name,
1247         int fd, struct lttng_event_notifier *event_notifier);
1248 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1249         struct lttng_kernel_event_callsite *callsite);
1250 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1251 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1252 #else
1253 static inline
1254 int lttng_uprobes_register_event(const char *name,
1255         int fd, struct lttng_event *event)
1256 {
1257         return -ENOSYS;
1258 }
1259
1260 static inline
1261 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1262         struct lttng_kernel_event_callsite *callsite)
1263 {
1264         return -ENOSYS;
1265 }
1266
1267 static inline
1268 void lttng_uprobes_unregister_event(struct lttng_event *event)
1269 {
1270 }
1271
1272 static inline
1273 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1274 {
1275 }
1276
1277 static inline
1278 int lttng_uprobes_register_event_notifier(const char *name,
1279         int fd, struct lttng_event_notifier *event_notifier)
1280 {
1281         return -ENOSYS;
1282 }
1283
1284 static inline
1285 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1286         struct lttng_kernel_event_callsite *callsite)
1287 {
1288         return -ENOSYS;
1289 }
1290
1291 static inline
1292 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1293 {
1294 }
1295
1296 static inline
1297 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1298 {
1299 }
1300 #endif
1301
1302 #ifdef CONFIG_KRETPROBES
1303 int lttng_kretprobes_register(const char *name,
1304                 const char *symbol_name,
1305                 uint64_t offset,
1306                 uint64_t addr,
1307                 struct lttng_event *event_entry,
1308                 struct lttng_event *event_exit);
1309 void lttng_kretprobes_unregister(struct lttng_event *event);
1310 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1311 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1312         int enable);
1313 #else
1314 static inline
1315 int lttng_kretprobes_register(const char *name,
1316                 const char *symbol_name,
1317                 uint64_t offset,
1318                 uint64_t addr,
1319                 struct lttng_event *event_entry,
1320                 struct lttng_event *event_exit)
1321 {
1322         return -ENOSYS;
1323 }
1324
1325 static inline
1326 void lttng_kretprobes_unregister(struct lttng_event *event)
1327 {
1328 }
1329
1330 static inline
1331 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1332 {
1333 }
1334
1335 static inline
1336 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1337         int enable)
1338 {
1339         return -ENOSYS;
1340 }
1341 #endif
1342
1343 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1344
1345 extern const struct file_operations lttng_tracepoint_list_fops;
1346 extern const struct file_operations lttng_syscall_list_fops;
1347
1348 #define TRACEPOINT_HAS_DATA_ARG
1349
1350 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1351 {
1352         if (type->atype != atype_integer)
1353                 return false;
1354         switch (type->u.integer.size) {
1355         case 8:         /* Fall-through. */
1356         case 16:        /* Fall-through. */
1357         case 32:        /* Fall-through. */
1358         case 64:
1359                 break;
1360         default:
1361                 return false;
1362         }
1363         return true;
1364 }
1365
1366 #endif /* _LTTNG_EVENTS_H */