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         int enabled;
 360         int registered;                 /* has reg'd tracepoint probe */
 361         const struct lttng_event_desc *desc;
 362         void *filter;
 363         struct list_head list;          /* event_notifier list in event_notifier group */
 364
 365         enum lttng_kernel_instrumentation instrumentation;
 366         union {
 367                 struct lttng_kprobe kprobe;
 368                 struct lttng_uprobe uprobe;
 369                 struct {
 370                         enum lttng_syscall_entryexit entryexit;
 371                         enum lttng_syscall_abi abi;
 372                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 373                         unsigned int syscall_id;
 374                 } syscall;
 375
 376         } u;
 377
 378         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 379         struct list_head enablers_ref_head;
 380         struct hlist_node hlist;        /* session ht of event_notifiers */
 381         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 382         struct list_head filter_bytecode_runtime_head;
 383         size_t num_captures;
 384         struct list_head capture_bytecode_runtime_head;
 385         int has_enablers_without_bytecode;
 386
 387         void (*send_notification)(struct lttng_event_notifier *event_notifier,
 388                         struct lttng_probe_ctx *lttng_probe_ctx,
 389                         const char *interpreter_stack_data);
 390         struct lttng_event_notifier_group *group; /* Weak ref */
 391 };
 392
 393 enum lttng_enabler_format_type {
 394         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 395         LTTNG_ENABLER_FORMAT_NAME,
 396 };
 397
 398 /*
 399  * Enabler field, within whatever object is enabling an event. Target of
 400  * backward reference.
 401  */
 402 struct lttng_enabler {
 403         enum lttng_event_type evtype;   /* First field. */
 404
 405         enum lttng_enabler_format_type format_type;
 406
 407         /* head list of struct lttng_bytecode_node */
 408         struct list_head filter_bytecode_head;
 409
 410         struct lttng_kernel_event event_param;
 411         unsigned int enabled:1;
 412
 413         uint64_t user_token;            /* User-provided token. */
 414 };
 415
 416 struct lttng_event_enabler {
 417         struct lttng_enabler base;
 418         struct list_head node;  /* per-session list of enablers */
 419         struct lttng_channel *chan;
 420         /*
 421          * Unused, but kept around to make it explicit that the tracer can do
 422          * it.
 423          */
 424         struct lttng_ctx *ctx;
 425 };
 426
 427 struct lttng_event_notifier_enabler {
 428         struct lttng_enabler base;
 429         struct list_head node;  /* List of event_notifier enablers */
 430         struct lttng_event_notifier_group *group;
 431
 432         /* head list of struct lttng_bytecode_node */
 433         struct list_head capture_bytecode_head;
 434         uint64_t num_captures;
 435 };
 436
 437
 438 static inline
 439 struct lttng_enabler *lttng_event_enabler_as_enabler(
 440                 struct lttng_event_enabler *event_enabler)
 441 {
 442         return &event_enabler->base;
 443 }
 444
 445 static inline
 446 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 447                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 448 {
 449         return &event_notifier_enabler->base;
 450 }
 451
 452 struct lttng_channel_ops {
 453         struct channel *(*channel_create)(const char *name,
 454                                 void *priv,
 455                                 void *buf_addr,
 456                                 size_t subbuf_size, size_t num_subbuf,
 457                                 unsigned int switch_timer_interval,
 458                                 unsigned int read_timer_interval);
 459         void (*channel_destroy)(struct channel *chan);
 460         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 461         int (*buffer_has_read_closed_stream)(struct channel *chan);
 462         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 463         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 464                              uint32_t event_id);
 465         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 466         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 467                             size_t len);
 468         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 469                                       const void *src, size_t len);
 470         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 471                              int c, size_t len);
 472         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 473                              size_t len);
 474         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 475                                        const char __user *src, size_t len);
 476         /*
 477          * packet_avail_size returns the available size in the current
 478          * packet. Note that the size returned is only a hint, since it
 479          * may change due to concurrent writes.
 480          */
 481         size_t (*packet_avail_size)(struct channel *chan);
 482         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 483         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 484         int (*is_finalized)(struct channel *chan);
 485         int (*is_disabled)(struct channel *chan);
 486         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 487                         struct lib_ring_buffer *bufb,
 488                         uint64_t *timestamp_begin);
 489         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 490                         struct lib_ring_buffer *bufb,
 491                         uint64_t *timestamp_end);
 492         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 493                         struct lib_ring_buffer *bufb,
 494                         uint64_t *events_discarded);
 495         int (*content_size) (const struct lib_ring_buffer_config *config,
 496                         struct lib_ring_buffer *bufb,
 497                         uint64_t *content_size);
 498         int (*packet_size) (const struct lib_ring_buffer_config *config,
 499                         struct lib_ring_buffer *bufb,
 500                         uint64_t *packet_size);
 501         int (*stream_id) (const struct lib_ring_buffer_config *config,
 502                         struct lib_ring_buffer *bufb,
 503                         uint64_t *stream_id);
 504         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 505                         struct lib_ring_buffer *bufb,
 506                         uint64_t *ts);
 507         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 508                         struct lib_ring_buffer *bufb,
 509                         uint64_t *seq);
 510         int (*instance_id) (const struct lib_ring_buffer_config *config,
 511                         struct lib_ring_buffer *bufb,
 512                         uint64_t *id);
 513 };
 514
 515 struct lttng_counter_ops {
 516         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 517                         const size_t *max_nr_elem,      /* for each dimension */
 518                         int64_t global_sum_step);
 519         void (*counter_destroy)(struct lib_counter *counter);
 520         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 521                         int64_t v);
 522         /*
 523          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 524          * the global aggregation counter if @cpu == -1.
 525          */
 526         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 527                          int64_t *value, bool *overflow, bool *underflow);
 528         /*
 529          * counter_aggregate returns the total sum of all per-cpu counters and
 530          * the global aggregation counter.
 531          */
 532         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 533                         int64_t *value, bool *overflow, bool *underflow);
 534         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 535 };
 536
 537 struct lttng_transport {
 538         char *name;
 539         struct module *owner;
 540         struct list_head node;
 541         struct lttng_channel_ops ops;
 542 };
 543
 544 struct lttng_counter_transport {
 545         char *name;
 546         struct module *owner;
 547         struct list_head node;
 548         struct lttng_counter_ops ops;
 549 };
 550
 551 struct lttng_syscall_filter;
 552
 553 #define LTTNG_EVENT_HT_BITS             12
 554 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 555
 556 struct lttng_event_ht {
 557         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 558 };
 559
 560 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 561 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 562
 563 struct lttng_event_notifier_ht {
 564         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 565 };
 566
 567 struct lttng_channel {
 568         unsigned int id;
 569         struct channel *chan;           /* Channel buffers */
 570         int enabled;
 571         struct lttng_ctx *ctx;
 572         /* Event ID management */
 573         struct lttng_session *session;
 574         struct file *file;              /* File associated to channel */
 575         unsigned int free_event_id;     /* Next event ID to allocate */
 576         struct list_head list;          /* Channel list */
 577         struct lttng_channel_ops *ops;
 578         struct lttng_transport *transport;
 579         struct lttng_event **sc_table;  /* for syscall tracing */
 580         struct lttng_event **compat_sc_table;
 581         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 582         struct lttng_event **compat_sc_exit_table;
 583         struct lttng_event *sc_unknown; /* for unknown syscalls */
 584         struct lttng_event *sc_compat_unknown;
 585         struct lttng_event *sc_exit_unknown;
 586         struct lttng_event *compat_sc_exit_unknown;
 587         struct lttng_syscall_filter *sc_filter;
 588         int header_type;                /* 0: unset, 1: compact, 2: large */
 589         enum channel_type channel_type;
 590         int syscall_all;
 591         unsigned int metadata_dumped:1,
 592                 sys_enter_registered:1,
 593                 sys_exit_registered:1,
 594                 tstate:1;               /* Transient enable state */
 595 };
 596
 597 struct lttng_metadata_stream {
 598         void *priv;                     /* Ring buffer private data */
 599         struct lttng_metadata_cache *metadata_cache;
 600         unsigned int metadata_in;       /* Bytes read from the cache */
 601         unsigned int metadata_out;      /* Bytes consumed from stream */
 602         int finalized;                  /* Has channel been finalized */
 603         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 604         struct list_head list;          /* Stream list */
 605         struct lttng_transport *transport;
 606         uint64_t version;               /* Current version of the metadata cache */
 607         bool coherent;                  /* Stream in a coherent state */
 608 };
 609
 610 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 611
 612 struct lttng_dynamic_len_stack {
 613         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 614         size_t offset;
 615 };
 616
 617 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 618
 619 /*
 620  * struct lttng_id_tracker declared in header due to deferencing of *v
 621  * in RCU_INITIALIZER(v).
 622  */
 623 #define LTTNG_ID_HASH_BITS      6
 624 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 625
 626 enum tracker_type {
 627         TRACKER_PID,
 628         TRACKER_VPID,
 629         TRACKER_UID,
 630         TRACKER_VUID,
 631         TRACKER_GID,
 632         TRACKER_VGID,
 633
 634         TRACKER_UNKNOWN,
 635 };
 636
 637 struct lttng_id_tracker_rcu {
 638         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 639 };
 640
 641 struct lttng_id_tracker {
 642         struct lttng_session *session;
 643         enum tracker_type tracker_type;
 644         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 645 };
 646
 647 struct lttng_id_hash_node {
 648         struct hlist_node hlist;
 649         int id;
 650 };
 651
 652 struct lttng_session {
 653         int active;                     /* Is trace session active ? */
 654         int been_active;                /* Has trace session been active ? */
 655         struct file *file;              /* File associated to session */
 656         struct list_head chan;          /* Channel list head */
 657         struct list_head events;        /* Event list head */
 658         struct list_head list;          /* Session list */
 659         unsigned int free_chan_id;      /* Next chan ID to allocate */
 660         uuid_le uuid;                   /* Trace session unique ID */
 661         struct lttng_metadata_cache *metadata_cache;
 662         struct lttng_id_tracker pid_tracker;
 663         struct lttng_id_tracker vpid_tracker;
 664         struct lttng_id_tracker uid_tracker;
 665         struct lttng_id_tracker vuid_tracker;
 666         struct lttng_id_tracker gid_tracker;
 667         struct lttng_id_tracker vgid_tracker;
 668         unsigned int metadata_dumped:1,
 669                 tstate:1;               /* Transient enable state */
 670         /* List of event enablers */
 671         struct list_head enablers_head;
 672         /* Hash table of events */
 673         struct lttng_event_ht events_ht;
 674         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 675         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 676 };
 677
 678 struct lttng_event_notifier_group {
 679         struct file *file;              /* File associated to event notifier group */
 680         struct file *notif_file;        /* File used to expose notifications to userspace. */
 681         struct list_head node;          /* event notifier group list */
 682         struct list_head enablers_head; /* List of enablers */
 683         struct list_head event_notifiers_head; /* List of event notifier */
 684         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 685         struct lttng_ctx *ctx;          /* Contexts for filters. */
 686         struct lttng_channel_ops *ops;
 687         struct lttng_transport *transport;
 688         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 689         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 690         wait_queue_head_t read_wait;
 691         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 692         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 693         struct lttng_event_notifier *sc_compat_unknown;
 694
 695         struct lttng_syscall_filter *sc_filter;
 696
 697         struct hlist_head *event_notifier_syscall_dispatch;
 698         struct hlist_head *event_notifier_compat_syscall_dispatch;
 699         struct hlist_head *event_notifier_exit_syscall_dispatch;
 700         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 701
 702         struct hlist_head event_notifier_unknown_syscall_dispatch;
 703         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 704         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 705         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 706
 707         int syscall_all_entry;
 708         int syscall_all_exit;
 709
 710         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 711
 712         struct lttng_counter *error_counter;
 713         size_t error_counter_len;
 714 };
 715
 716 struct lttng_metadata_cache {
 717         char *data;                     /* Metadata cache */
 718         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 719         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 720         atomic_t producing;             /* Metadata being produced (incomplete) */
 721         struct kref refcount;           /* Metadata cache usage */
 722         struct list_head metadata_stream;       /* Metadata stream list */
 723         uuid_le uuid;                   /* Trace session unique ID (copy) */
 724         struct mutex lock;              /* Produce/consume lock */
 725         uint64_t version;               /* Current version of the metadata */
 726 };
 727
 728 void lttng_lock_sessions(void);
 729 void lttng_unlock_sessions(void);
 730
 731 struct list_head *lttng_get_probe_list_head(void);
 732
 733 struct lttng_event_enabler *lttng_event_enabler_create(
 734                 enum lttng_enabler_format_type format_type,
 735                 struct lttng_kernel_event *event_param,
 736                 struct lttng_channel *chan);
 737
 738 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 739 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 740 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 741                 struct lttng_event_notifier_group *event_notifier_group,
 742                 enum lttng_enabler_format_type format_type,
 743                 struct lttng_kernel_event_notifier *event_notifier_param);
 744
 745 int lttng_event_notifier_enabler_enable(
 746                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 747 int lttng_event_notifier_enabler_disable(
 748                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 749 int lttng_fix_pending_events(void);
 750 int lttng_fix_pending_event_notifiers(void);
 751 int lttng_session_active(void);
 752 bool lttng_event_notifier_active(void);
 753
 754 struct lttng_session *lttng_session_create(void);
 755 int lttng_session_enable(struct lttng_session *session);
 756 int lttng_session_disable(struct lttng_session *session);
 757 void lttng_session_destroy(struct lttng_session *session);
 758 int lttng_session_metadata_regenerate(struct lttng_session *session);
 759 int lttng_session_statedump(struct lttng_session *session);
 760 void metadata_cache_destroy(struct kref *kref);
 761
 762 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 763 void lttng_event_notifier_group_destroy(
 764                 struct lttng_event_notifier_group *event_notifier_group);
 765
 766 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 767                                        const char *transport_name,
 768                                        void *buf_addr,
 769                                        size_t subbuf_size, size_t num_subbuf,
 770                                        unsigned int switch_timer_interval,
 771                                        unsigned int read_timer_interval,
 772                                        enum channel_type channel_type);
 773 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 774                                        int overwrite, void *buf_addr,
 775                                        size_t subbuf_size, size_t num_subbuf,
 776                                        unsigned int switch_timer_interval,
 777                                        unsigned int read_timer_interval);
 778
 779 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 780 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 781                                 struct lttng_kernel_event *event_param,
 782                                 void *filter,
 783                                 const struct lttng_event_desc *event_desc,
 784                                 enum lttng_kernel_instrumentation itype);
 785 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 786                                 struct lttng_kernel_event *event_param,
 787                                 void *filter,
 788                                 const struct lttng_event_desc *event_desc,
 789                                 enum lttng_kernel_instrumentation itype);
 790 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 791                 struct lttng_kernel_old_event *old_event_param,
 792                 void *filter,
 793                 const struct lttng_event_desc *internal_desc);
 794
 795 struct lttng_event_notifier *lttng_event_notifier_create(
 796                                 const struct lttng_event_desc *event_notifier_desc,
 797                                 uint64_t id,
 798                                 struct lttng_event_notifier_group *event_notifier_group,
 799                                 struct lttng_kernel_event_notifier *event_notifier_param,
 800                                 void *filter,
 801                                 enum lttng_kernel_instrumentation itype);
 802 struct lttng_event_notifier *_lttng_event_notifier_create(
 803                                 const struct lttng_event_desc *event_notifier_desc,
 804                                 uint64_t id,
 805                                 struct lttng_event_notifier_group *event_notifier_group,
 806                                 struct lttng_kernel_event_notifier *event_notifier_param,
 807                                 void *filter,
 808                                 enum lttng_kernel_instrumentation itype);
 809
 810 int lttng_channel_enable(struct lttng_channel *channel);
 811 int lttng_channel_disable(struct lttng_channel *channel);
 812 int lttng_event_enable(struct lttng_event *event);
 813 int lttng_event_disable(struct lttng_event *event);
 814
 815 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 816 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 817
 818 void lttng_transport_register(struct lttng_transport *transport);
 819 void lttng_transport_unregister(struct lttng_transport *transport);
 820
 821 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
 822 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
 823
 824 void synchronize_trace(void);
 825 int lttng_abi_init(void);
 826 int lttng_abi_compat_old_init(void);
 827 void lttng_abi_exit(void);
 828 void lttng_abi_compat_old_exit(void);
 829
 830 int lttng_probe_register(struct lttng_probe_desc *desc);
 831 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 832 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 833 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 834 int lttng_probes_init(void);
 835 void lttng_probes_exit(void);
 836
 837 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 838                 struct channel *chan, bool *coherent);
 839
 840 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 841 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 842 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 843 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 844 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 845 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 846
 847 int lttng_session_track_id(struct lttng_session *session,
 848                 enum tracker_type tracker_type, int id);
 849 int lttng_session_untrack_id(struct lttng_session *session,
 850                 enum tracker_type tracker_type, int id);
 851
 852 int lttng_session_list_tracker_ids(struct lttng_session *session,
 853                 enum tracker_type tracker_type);
 854
 855 void lttng_clock_ref(void);
 856 void lttng_clock_unref(void);
 857
 858 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 859                 struct lttng_enabler *enabler);
 860
 861 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 862 int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter);
 863 int lttng_syscalls_unregister_event(struct lttng_channel *chan);
 864 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 865 int lttng_syscall_filter_enable_event(
 866                 struct lttng_channel *chan,
 867                 struct lttng_event *event);
 868 int lttng_syscall_filter_disable_event(
 869                 struct lttng_channel *chan,
 870                 struct lttng_event *event);
 871
 872 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 873                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 874
 875 int lttng_syscalls_register_event_notifier(
 876                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 877                 void *filter);
 878 int lttng_syscals_create_matching_event_notifiers(
 879                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 880 int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *group);
 881 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 882 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 883 #else
 884 static inline int lttng_syscalls_register_event(
 885                 struct lttng_channel *chan, void *filter)
 886 {
 887         return -ENOSYS;
 888 }
 889
 890 static inline int lttng_syscalls_unregister_event(struct lttng_channel *chan)
 891 {
 892         return 0;
 893 }
 894
 895 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 896 {
 897         return 0;
 898 }
 899
 900 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 901                 struct lttng_event *event);
 902 {
 903         return -ENOSYS;
 904 }
 905
 906 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 907                 struct lttng_event *event);
 908 {
 909         return -ENOSYS;
 910 }
 911
 912 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 913                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 914 {
 915         return -ENOSYS;
 916 }
 917
 918 static inline int lttng_syscalls_register_event_notifier(
 919                 struct lttng_event_notifier_group *group, void *filter)
 920 {
 921         return -ENOSYS;
 922 }
 923
 924 static inline int lttng_syscalls_unregister_event_notifier(
 925                 struct lttng_event_notifier_group *group)
 926 {
 927         return 0;
 928 }
 929
 930 static inline int lttng_syscall_filter_enable_event_notifier(
 931                 struct lttng_event_notifier_group *group,
 932                 const char *name)
 933 {
 934         return -ENOSYS;
 935 }
 936
 937 static inline int lttng_syscall_filter_disable_event_notifier(
 938                 struct lttng_event_notifier_group *group,
 939                 const char *name)
 940 {
 941         return -ENOSYS;
 942 }
 943
 944 #endif
 945
 946 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 947                 struct lttng_kernel_filter_bytecode __user *bytecode);
 948 int lttng_event_notifier_enabler_attach_filter_bytecode(
 949                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 950                 struct lttng_kernel_filter_bytecode __user *bytecode);
 951 int lttng_event_notifier_enabler_attach_capture_bytecode(
 952                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 953                 struct lttng_kernel_capture_bytecode __user *bytecode);
 954
 955 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 956                 struct lttng_ctx *ctx,
 957                 struct list_head *instance_bytecode_runtime_head,
 958                 struct list_head *enabler_bytecode_runtime_head);
 959
 960 int lttng_probes_init(void);
 961
 962 extern struct lttng_ctx *lttng_static_ctx;
 963
 964 int lttng_context_init(void);
 965 void lttng_context_exit(void);
 966 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 967 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 968 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 969                 size_t index);
 970 void lttng_context_update(struct lttng_ctx *ctx);
 971 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 972 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 973 void lttng_remove_context_field(struct lttng_ctx **ctx,
 974                                 struct lttng_ctx_field *field);
 975 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
 976 void lttng_destroy_context(struct lttng_ctx *ctx);
 977 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 978 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 979 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 980 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 981 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 982 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 983 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 984 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 985 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 986 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 987 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 988 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 989 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 990 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 991 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 992 #else
 993 static inline
 994 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 995 {
 996         return -ENOSYS;
 997 }
 998 #endif
 999 #ifdef CONFIG_PREEMPT_RT_FULL
1000 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
1001 #else
1002 static inline
1003 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
1004 {
1005         return -ENOSYS;
1006 }
1007 #endif
1008
1009 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
1010
1011 #if defined(CONFIG_CGROUPS) && \
1012         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
1013          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
1014 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
1015 #else
1016 static inline
1017 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
1018 {
1019         return -ENOSYS;
1020 }
1021 #endif
1022
1023 #if defined(CONFIG_IPC_NS) && \
1024         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1025 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
1026 #else
1027 static inline
1028 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
1029 {
1030         return -ENOSYS;
1031 }
1032 #endif
1033
1034 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
1035         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1036 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
1037 #else
1038 static inline
1039 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
1040 {
1041         return -ENOSYS;
1042 }
1043 #endif
1044
1045 #if defined(CONFIG_NET_NS) && \
1046         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1047 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
1048 #else
1049 static inline
1050 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
1051 {
1052         return -ENOSYS;
1053 }
1054 #endif
1055
1056 #if defined(CONFIG_PID_NS) && \
1057         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1058 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1059 #else
1060 static inline
1061 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1062 {
1063         return -ENOSYS;
1064 }
1065 #endif
1066
1067 #if defined(CONFIG_USER_NS) && \
1068         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1069 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1070 #else
1071 static inline
1072 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1073 {
1074         return -ENOSYS;
1075 }
1076 #endif
1077
1078 #if defined(CONFIG_UTS_NS) && \
1079         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1080 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1081 #else
1082 static inline
1083 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1084 {
1085         return -ENOSYS;
1086 }
1087 #endif
1088
1089 #if defined(CONFIG_TIME_NS) && \
1090         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1091 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1092 #else
1093 static inline
1094 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1095 {
1096         return -ENOSYS;
1097 }
1098 #endif
1099
1100 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1101 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1102 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1103 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1104 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1105 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1106 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1107 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1108 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1109 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1110 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1111 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1112
1113 #if defined(CONFIG_PERF_EVENTS)
1114 int lttng_add_perf_counter_to_ctx(uint32_t type,
1115                                   uint64_t config,
1116                                   const char *name,
1117                                   struct lttng_ctx **ctx);
1118 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1119                 struct lttng_cpuhp_node *node);
1120 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1121                 struct lttng_cpuhp_node *node);
1122 #else
1123 static inline
1124 int lttng_add_perf_counter_to_ctx(uint32_t type,
1125                                   uint64_t config,
1126                                   const char *name,
1127                                   struct lttng_ctx **ctx)
1128 {
1129         return -ENOSYS;
1130 }
1131 static inline
1132 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1133                 struct lttng_cpuhp_node *node)
1134 {
1135         return 0;
1136 }
1137 static inline
1138 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1139                 struct lttng_cpuhp_node *node)
1140 {
1141         return 0;
1142 }
1143 #endif
1144
1145 int lttng_logger_init(void);
1146 void lttng_logger_exit(void);
1147
1148 extern int lttng_statedump_start(struct lttng_session *session);
1149
1150 #ifdef CONFIG_KPROBES
1151 int lttng_kprobes_register_event(const char *name,
1152                 const char *symbol_name,
1153                 uint64_t offset,
1154                 uint64_t addr,
1155                 struct lttng_event *event);
1156 void lttng_kprobes_unregister_event(struct lttng_event *event);
1157 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1158 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1159                 uint64_t offset,
1160                 uint64_t addr,
1161                 struct lttng_event_notifier *event_notifier);
1162 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1163 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1164 #else
1165 static inline
1166 int lttng_kprobes_register_event(const char *name,
1167                 const char *symbol_name,
1168                 uint64_t offset,
1169                 uint64_t addr,
1170                 struct lttng_event *event)
1171 {
1172         return -ENOSYS;
1173 }
1174
1175 static inline
1176 void lttng_kprobes_unregister_event(struct lttng_event *event)
1177 {
1178 }
1179
1180 static inline
1181 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1182 {
1183 }
1184
1185 static inline
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 {
1191         return -ENOSYS;
1192 }
1193
1194 static inline
1195 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1196 {
1197 }
1198
1199 static inline
1200 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1201 {
1202 }
1203 #endif
1204
1205 int lttng_event_add_callsite(struct lttng_event *event,
1206         struct lttng_kernel_event_callsite *callsite);
1207
1208 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1209         struct lttng_kernel_event_callsite *callsite);
1210
1211 #ifdef CONFIG_UPROBES
1212 int lttng_uprobes_register_event(const char *name,
1213         int fd, struct lttng_event *event);
1214 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1215         struct lttng_kernel_event_callsite *callsite);
1216 void lttng_uprobes_unregister_event(struct lttng_event *event);
1217 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1218 int lttng_uprobes_register_event_notifier(const char *name,
1219         int fd, struct lttng_event_notifier *event_notifier);
1220 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1221         struct lttng_kernel_event_callsite *callsite);
1222 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1223 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1224 #else
1225 static inline
1226 int lttng_uprobes_register_event(const char *name,
1227         int fd, struct lttng_event *event)
1228 {
1229         return -ENOSYS;
1230 }
1231
1232 static inline
1233 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1234         struct lttng_kernel_event_callsite *callsite)
1235 {
1236         return -ENOSYS;
1237 }
1238
1239 static inline
1240 void lttng_uprobes_unregister_event(struct lttng_event *event)
1241 {
1242 }
1243
1244 static inline
1245 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1246 {
1247 }
1248
1249 static inline
1250 int lttng_uprobes_register_event_notifier(const char *name,
1251         int fd, struct lttng_event_notifier *event_notifier)
1252 {
1253         return -ENOSYS;
1254 }
1255
1256 static inline
1257 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1258         struct lttng_kernel_event_callsite *callsite)
1259 {
1260         return -ENOSYS;
1261 }
1262
1263 static inline
1264 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1265 {
1266 }
1267
1268 static inline
1269 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1270 {
1271 }
1272 #endif
1273
1274 #ifdef CONFIG_KRETPROBES
1275 int lttng_kretprobes_register(const char *name,
1276                 const char *symbol_name,
1277                 uint64_t offset,
1278                 uint64_t addr,
1279                 struct lttng_event *event_entry,
1280                 struct lttng_event *event_exit);
1281 void lttng_kretprobes_unregister(struct lttng_event *event);
1282 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1283 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1284         int enable);
1285 #else
1286 static inline
1287 int lttng_kretprobes_register(const char *name,
1288                 const char *symbol_name,
1289                 uint64_t offset,
1290                 uint64_t addr,
1291                 struct lttng_event *event_entry,
1292                 struct lttng_event *event_exit)
1293 {
1294         return -ENOSYS;
1295 }
1296
1297 static inline
1298 void lttng_kretprobes_unregister(struct lttng_event *event)
1299 {
1300 }
1301
1302 static inline
1303 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1304 {
1305 }
1306
1307 static inline
1308 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1309         int enable)
1310 {
1311         return -ENOSYS;
1312 }
1313 #endif
1314
1315 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1316
1317 extern const struct file_operations lttng_tracepoint_list_fops;
1318 extern const struct file_operations lttng_syscall_list_fops;
1319
1320 #define TRACEPOINT_HAS_DATA_ARG
1321
1322 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1323 {
1324         if (type->atype != atype_integer)
1325                 return false;
1326         switch (type->u.integer.size) {
1327         case 8:         /* Fall-through. */
1328         case 16:        /* Fall-through. */
1329         case 32:        /* Fall-through. */
1330         case 64:
1331                 break;
1332         default:
1333                 return false;
1334         }
1335         return true;
1336 }
1337
1338 #endif /* _LTTNG_EVENTS_H */