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                         struct hlist_node node;                 /* chain registered syscall event */
 342                 } syscall;
 343         } u;
 344         struct list_head list;          /* Event list in session */
 345         unsigned int metadata_dumped:1;
 346
 347         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 348         struct list_head enablers_ref_head;
 349         struct hlist_node hlist;        /* session ht of events */
 350         int registered;                 /* has reg'd tracepoint probe */
 351         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 352         struct list_head filter_bytecode_runtime_head;
 353         int has_enablers_without_bytecode;
 354 };
 355
 356 // FIXME: Really similar to lttng_event above. Could those be merged ?
 357 struct lttng_event_notifier {
 358         enum lttng_event_type evtype;   /* First field. */
 359         uint64_t user_token;
 360         uint64_t error_counter_index;
 361         int enabled;
 362         int registered;                 /* has reg'd tracepoint probe */
 363         const struct lttng_event_desc *desc;
 364         void *filter;
 365         struct list_head list;          /* event_notifier list in event_notifier group */
 366
 367         enum lttng_kernel_instrumentation instrumentation;
 368         union {
 369                 struct lttng_kprobe kprobe;
 370                 struct lttng_uprobe uprobe;
 371                 struct {
 372                         enum lttng_syscall_entryexit entryexit;
 373                         enum lttng_syscall_abi abi;
 374                         struct hlist_node node;                 /* chain registered syscall event_notifier */
 375                         unsigned int syscall_id;
 376                 } syscall;
 377
 378         } u;
 379
 380         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 381         struct list_head enablers_ref_head;
 382         struct hlist_node hlist;        /* session ht of event_notifiers */
 383         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 384         struct list_head filter_bytecode_runtime_head;
 385         size_t num_captures;
 386         struct list_head capture_bytecode_runtime_head;
 387         int has_enablers_without_bytecode;
 388
 389         void (*send_notification)(struct lttng_event_notifier *event_notifier,
 390                         struct lttng_probe_ctx *lttng_probe_ctx,
 391                         const char *interpreter_stack_data);
 392         struct lttng_event_notifier_group *group; /* Weak ref */
 393 };
 394
 395 enum lttng_enabler_format_type {
 396         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 397         LTTNG_ENABLER_FORMAT_NAME,
 398 };
 399
 400 /*
 401  * Enabler field, within whatever object is enabling an event. Target of
 402  * backward reference.
 403  */
 404 struct lttng_enabler {
 405         enum lttng_event_type evtype;   /* First field. */
 406
 407         enum lttng_enabler_format_type format_type;
 408
 409         /* head list of struct lttng_bytecode_node */
 410         struct list_head filter_bytecode_head;
 411
 412         struct lttng_kernel_event event_param;
 413         unsigned int enabled:1;
 414
 415         uint64_t user_token;            /* User-provided token. */
 416 };
 417
 418 struct lttng_event_enabler {
 419         struct lttng_enabler base;
 420         struct list_head node;  /* per-session list of enablers */
 421         struct lttng_channel *chan;
 422         /*
 423          * Unused, but kept around to make it explicit that the tracer can do
 424          * it.
 425          */
 426         struct lttng_ctx *ctx;
 427 };
 428
 429 struct lttng_event_notifier_enabler {
 430         struct lttng_enabler base;
 431         uint64_t error_counter_index;
 432         struct list_head node;  /* List of event_notifier enablers */
 433         struct lttng_event_notifier_group *group;
 434
 435         /* head list of struct lttng_bytecode_node */
 436         struct list_head capture_bytecode_head;
 437         uint64_t num_captures;
 438 };
 439
 440
 441 static inline
 442 struct lttng_enabler *lttng_event_enabler_as_enabler(
 443                 struct lttng_event_enabler *event_enabler)
 444 {
 445         return &event_enabler->base;
 446 }
 447
 448 static inline
 449 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 450                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 451 {
 452         return &event_notifier_enabler->base;
 453 }
 454
 455 struct lttng_channel_ops {
 456         struct channel *(*channel_create)(const char *name,
 457                                 void *priv,
 458                                 void *buf_addr,
 459                                 size_t subbuf_size, size_t num_subbuf,
 460                                 unsigned int switch_timer_interval,
 461                                 unsigned int read_timer_interval);
 462         void (*channel_destroy)(struct channel *chan);
 463         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 464         int (*buffer_has_read_closed_stream)(struct channel *chan);
 465         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 466         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 467                              uint32_t event_id);
 468         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 469         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 470                             size_t len);
 471         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 472                                       const void *src, size_t len);
 473         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 474                              int c, size_t len);
 475         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 476                              size_t len);
 477         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 478                                        const char __user *src, size_t len);
 479         /*
 480          * packet_avail_size returns the available size in the current
 481          * packet. Note that the size returned is only a hint, since it
 482          * may change due to concurrent writes.
 483          */
 484         size_t (*packet_avail_size)(struct channel *chan);
 485         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 486         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 487         int (*is_finalized)(struct channel *chan);
 488         int (*is_disabled)(struct channel *chan);
 489         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 490                         struct lib_ring_buffer *bufb,
 491                         uint64_t *timestamp_begin);
 492         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 493                         struct lib_ring_buffer *bufb,
 494                         uint64_t *timestamp_end);
 495         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 496                         struct lib_ring_buffer *bufb,
 497                         uint64_t *events_discarded);
 498         int (*content_size) (const struct lib_ring_buffer_config *config,
 499                         struct lib_ring_buffer *bufb,
 500                         uint64_t *content_size);
 501         int (*packet_size) (const struct lib_ring_buffer_config *config,
 502                         struct lib_ring_buffer *bufb,
 503                         uint64_t *packet_size);
 504         int (*stream_id) (const struct lib_ring_buffer_config *config,
 505                         struct lib_ring_buffer *bufb,
 506                         uint64_t *stream_id);
 507         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 508                         struct lib_ring_buffer *bufb,
 509                         uint64_t *ts);
 510         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 511                         struct lib_ring_buffer *bufb,
 512                         uint64_t *seq);
 513         int (*instance_id) (const struct lib_ring_buffer_config *config,
 514                         struct lib_ring_buffer *bufb,
 515                         uint64_t *id);
 516 };
 517
 518 struct lttng_counter_ops {
 519         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 520                         const size_t *max_nr_elem,      /* for each dimension */
 521                         int64_t global_sum_step);
 522         void (*counter_destroy)(struct lib_counter *counter);
 523         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 524                         int64_t v);
 525         /*
 526          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 527          * the global aggregation counter if @cpu == -1.
 528          */
 529         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 530                          int64_t *value, bool *overflow, bool *underflow);
 531         /*
 532          * counter_aggregate returns the total sum of all per-cpu counters and
 533          * the global aggregation counter.
 534          */
 535         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 536                         int64_t *value, bool *overflow, bool *underflow);
 537         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 538 };
 539
 540 struct lttng_transport {
 541         char *name;
 542         struct module *owner;
 543         struct list_head node;
 544         struct lttng_channel_ops ops;
 545 };
 546
 547 struct lttng_counter_transport {
 548         char *name;
 549         struct module *owner;
 550         struct list_head node;
 551         struct lttng_counter_ops ops;
 552 };
 553
 554 struct lttng_syscall_filter;
 555
 556 #define LTTNG_EVENT_HT_BITS             12
 557 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 558
 559 struct lttng_event_ht {
 560         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 561 };
 562
 563 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 564 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 565
 566 struct lttng_event_notifier_ht {
 567         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 568 };
 569
 570 struct lttng_channel {
 571         unsigned int id;
 572         struct channel *chan;           /* Channel buffers */
 573         int enabled;
 574         struct lttng_ctx *ctx;
 575         /* Event ID management */
 576         struct lttng_session *session;
 577         struct file *file;              /* File associated to channel */
 578         unsigned int free_event_id;     /* Next event ID to allocate */
 579         struct list_head list;          /* Channel list */
 580         struct lttng_channel_ops *ops;
 581         struct lttng_transport *transport;
 582         struct hlist_head *sc_table;    /* for syscall tracing */
 583         struct hlist_head *compat_sc_table;
 584         struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
 585         struct hlist_head *compat_sc_exit_table;
 586         struct hlist_head sc_unknown;   /* for unknown syscalls */
 587         struct hlist_head sc_compat_unknown;
 588         struct hlist_head sc_exit_unknown;
 589         struct hlist_head compat_sc_exit_unknown;
 590         struct lttng_syscall_filter *sc_filter;
 591         int header_type;                /* 0: unset, 1: compact, 2: large */
 592         enum channel_type channel_type;
 593         int syscall_all_entry;
 594         int syscall_all_exit;
 595         unsigned int metadata_dumped:1,
 596                 sys_enter_registered:1,
 597                 sys_exit_registered:1,
 598                 tstate:1;               /* Transient enable state */
 599 };
 600
 601 struct lttng_metadata_stream {
 602         void *priv;                     /* Ring buffer private data */
 603         struct lttng_metadata_cache *metadata_cache;
 604         unsigned int metadata_in;       /* Bytes read from the cache */
 605         unsigned int metadata_out;      /* Bytes consumed from stream */
 606         int finalized;                  /* Has channel been finalized */
 607         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 608         struct list_head list;          /* Stream list */
 609         struct lttng_transport *transport;
 610         uint64_t version;               /* Current version of the metadata cache */
 611         bool coherent;                  /* Stream in a coherent state */
 612 };
 613
 614 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 615
 616 struct lttng_dynamic_len_stack {
 617         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 618         size_t offset;
 619 };
 620
 621 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 622
 623 /*
 624  * struct lttng_id_tracker declared in header due to deferencing of *v
 625  * in RCU_INITIALIZER(v).
 626  */
 627 #define LTTNG_ID_HASH_BITS      6
 628 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 629
 630 enum tracker_type {
 631         TRACKER_PID,
 632         TRACKER_VPID,
 633         TRACKER_UID,
 634         TRACKER_VUID,
 635         TRACKER_GID,
 636         TRACKER_VGID,
 637
 638         TRACKER_UNKNOWN,
 639 };
 640
 641 struct lttng_id_tracker_rcu {
 642         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 643 };
 644
 645 struct lttng_id_tracker {
 646         struct lttng_session *session;
 647         enum tracker_type tracker_type;
 648         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 649 };
 650
 651 struct lttng_id_hash_node {
 652         struct hlist_node hlist;
 653         int id;
 654 };
 655
 656 struct lttng_session {
 657         int active;                     /* Is trace session active ? */
 658         int been_active;                /* Has trace session been active ? */
 659         struct file *file;              /* File associated to session */
 660         struct list_head chan;          /* Channel list head */
 661         struct list_head events;        /* Event list head */
 662         struct list_head list;          /* Session list */
 663         unsigned int free_chan_id;      /* Next chan ID to allocate */
 664         uuid_le uuid;                   /* Trace session unique ID */
 665         struct lttng_metadata_cache *metadata_cache;
 666         struct lttng_id_tracker pid_tracker;
 667         struct lttng_id_tracker vpid_tracker;
 668         struct lttng_id_tracker uid_tracker;
 669         struct lttng_id_tracker vuid_tracker;
 670         struct lttng_id_tracker gid_tracker;
 671         struct lttng_id_tracker vgid_tracker;
 672         unsigned int metadata_dumped:1,
 673                 tstate:1;               /* Transient enable state */
 674         /* List of event enablers */
 675         struct list_head enablers_head;
 676         /* Hash table of events */
 677         struct lttng_event_ht events_ht;
 678         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 679         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 680 };
 681
 682 struct lttng_counter {
 683         struct file *file;              /* File associated to counter. */
 684         struct file *owner;
 685         struct lttng_counter_transport *transport;
 686         struct lib_counter *counter;
 687         struct lttng_counter_ops *ops;
 688 };
 689
 690 struct lttng_event_notifier_group {
 691         struct file *file;              /* File associated to event notifier group */
 692         struct file *notif_file;        /* File used to expose notifications to userspace. */
 693         struct list_head node;          /* event notifier group list */
 694         struct list_head enablers_head; /* List of enablers */
 695         struct list_head event_notifiers_head; /* List of event notifier */
 696         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 697         struct lttng_ctx *ctx;          /* Contexts for filters. */
 698         struct lttng_channel_ops *ops;
 699         struct lttng_transport *transport;
 700         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 701         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 702         wait_queue_head_t read_wait;
 703         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 704         struct lttng_event_notifier *sc_unknown;        /* for unknown syscalls */
 705         struct lttng_event_notifier *sc_compat_unknown;
 706
 707         struct lttng_syscall_filter *sc_filter;
 708
 709         struct hlist_head *event_notifier_syscall_dispatch;
 710         struct hlist_head *event_notifier_compat_syscall_dispatch;
 711         struct hlist_head *event_notifier_exit_syscall_dispatch;
 712         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 713
 714         struct hlist_head event_notifier_unknown_syscall_dispatch;
 715         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 716         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 717         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 718
 719         int syscall_all_entry;
 720         int syscall_all_exit;
 721
 722         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 723
 724         struct lttng_counter *error_counter;
 725         size_t error_counter_len;
 726 };
 727
 728 struct lttng_metadata_cache {
 729         char *data;                     /* Metadata cache */
 730         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 731         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 732         atomic_t producing;             /* Metadata being produced (incomplete) */
 733         struct kref refcount;           /* Metadata cache usage */
 734         struct list_head metadata_stream;       /* Metadata stream list */
 735         uuid_le uuid;                   /* Trace session unique ID (copy) */
 736         struct mutex lock;              /* Produce/consume lock */
 737         uint64_t version;               /* Current version of the metadata */
 738 };
 739
 740 void lttng_lock_sessions(void);
 741 void lttng_unlock_sessions(void);
 742
 743 struct list_head *lttng_get_probe_list_head(void);
 744
 745 struct lttng_event_enabler *lttng_event_enabler_create(
 746                 enum lttng_enabler_format_type format_type,
 747                 struct lttng_kernel_event *event_param,
 748                 struct lttng_channel *chan);
 749
 750 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 751 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 752 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 753                 struct lttng_event_notifier_group *event_notifier_group,
 754                 enum lttng_enabler_format_type format_type,
 755                 struct lttng_kernel_event_notifier *event_notifier_param);
 756
 757 int lttng_event_notifier_enabler_enable(
 758                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 759 int lttng_event_notifier_enabler_disable(
 760                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 761 int lttng_fix_pending_events(void);
 762 int lttng_fix_pending_event_notifiers(void);
 763 int lttng_session_active(void);
 764 bool lttng_event_notifier_active(void);
 765
 766 struct lttng_session *lttng_session_create(void);
 767 int lttng_session_enable(struct lttng_session *session);
 768 int lttng_session_disable(struct lttng_session *session);
 769 void lttng_session_destroy(struct lttng_session *session);
 770 int lttng_session_metadata_regenerate(struct lttng_session *session);
 771 int lttng_session_statedump(struct lttng_session *session);
 772 void metadata_cache_destroy(struct kref *kref);
 773
 774 struct lttng_counter *lttng_kernel_counter_create(
 775                 const char *counter_transport_name, size_t number_dimensions,
 776                 const size_t *dimensions_sizes);
 777 int lttng_kernel_counter_read(struct lttng_counter *counter,
 778                 const size_t *dimension_indexes, int32_t cpu,
 779                 int64_t *val, bool *overflow, bool *underflow);
 780 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
 781                 const size_t *dimension_indexes, int64_t *val,
 782                 bool *overflow, bool *underflow);
 783 int lttng_kernel_counter_clear(struct lttng_counter *counter,
 784                 const size_t *dimension_indexes);
 785
 786
 787 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 788 int lttng_event_notifier_group_create_error_counter(
 789                 struct file *event_notifier_group_file,
 790                 const struct lttng_kernel_counter_conf *error_counter_conf);
 791 void lttng_event_notifier_group_destroy(
 792                 struct lttng_event_notifier_group *event_notifier_group);
 793
 794 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 795                                        const char *transport_name,
 796                                        void *buf_addr,
 797                                        size_t subbuf_size, size_t num_subbuf,
 798                                        unsigned int switch_timer_interval,
 799                                        unsigned int read_timer_interval,
 800                                        enum channel_type channel_type);
 801 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 802                                        int overwrite, void *buf_addr,
 803                                        size_t subbuf_size, size_t num_subbuf,
 804                                        unsigned int switch_timer_interval,
 805                                        unsigned int read_timer_interval);
 806
 807 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 808 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 809                                 struct lttng_kernel_event *event_param,
 810                                 void *filter,
 811                                 const struct lttng_event_desc *event_desc,
 812                                 enum lttng_kernel_instrumentation itype);
 813 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 814                                 struct lttng_kernel_event *event_param,
 815                                 void *filter,
 816                                 const struct lttng_event_desc *event_desc,
 817                                 enum lttng_kernel_instrumentation itype);
 818 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 819                 struct lttng_kernel_old_event *old_event_param,
 820                 void *filter,
 821                 const struct lttng_event_desc *internal_desc);
 822
 823 struct lttng_event_notifier *lttng_event_notifier_create(
 824                                 const struct lttng_event_desc *event_notifier_desc,
 825                                 uint64_t id,
 826                                 uint64_t error_counter_idx,
 827                                 struct lttng_event_notifier_group *event_notifier_group,
 828                                 struct lttng_kernel_event_notifier *event_notifier_param,
 829                                 void *filter,
 830                                 enum lttng_kernel_instrumentation itype);
 831 struct lttng_event_notifier *_lttng_event_notifier_create(
 832                                 const struct lttng_event_desc *event_notifier_desc,
 833                                 uint64_t id,
 834                                 uint64_t error_counter_idx,
 835                                 struct lttng_event_notifier_group *event_notifier_group,
 836                                 struct lttng_kernel_event_notifier *event_notifier_param,
 837                                 void *filter,
 838                                 enum lttng_kernel_instrumentation itype);
 839
 840 int lttng_channel_enable(struct lttng_channel *channel);
 841 int lttng_channel_disable(struct lttng_channel *channel);
 842 int lttng_event_enable(struct lttng_event *event);
 843 int lttng_event_disable(struct lttng_event *event);
 844
 845 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier);
 846 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 847
 848 void lttng_transport_register(struct lttng_transport *transport);
 849 void lttng_transport_unregister(struct lttng_transport *transport);
 850
 851 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
 852 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
 853
 854 void synchronize_trace(void);
 855 int lttng_abi_init(void);
 856 int lttng_abi_compat_old_init(void);
 857 void lttng_abi_exit(void);
 858 void lttng_abi_compat_old_exit(void);
 859
 860 int lttng_probe_register(struct lttng_probe_desc *desc);
 861 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 862 const struct lttng_event_desc *lttng_event_desc_get(const char *name);
 863 void lttng_event_desc_put(const struct lttng_event_desc *desc);
 864 int lttng_probes_init(void);
 865 void lttng_probes_exit(void);
 866
 867 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 868                 struct channel *chan, bool *coherent);
 869
 870 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 871 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 872 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 873 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 874 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 875 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 876
 877 int lttng_session_track_id(struct lttng_session *session,
 878                 enum tracker_type tracker_type, int id);
 879 int lttng_session_untrack_id(struct lttng_session *session,
 880                 enum tracker_type tracker_type, int id);
 881
 882 int lttng_session_list_tracker_ids(struct lttng_session *session,
 883                 enum tracker_type tracker_type);
 884
 885 void lttng_clock_ref(void);
 886 void lttng_clock_unref(void);
 887
 888 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
 889                 struct lttng_enabler *enabler);
 890
 891 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 892 int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler, void *filter);
 893 int lttng_syscalls_unregister_channel(struct lttng_channel *chan);
 894 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 895 int lttng_syscall_filter_enable_event(
 896                 struct lttng_channel *chan,
 897                 struct lttng_event *event);
 898 int lttng_syscall_filter_disable_event(
 899                 struct lttng_channel *chan,
 900                 struct lttng_event *event);
 901
 902 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 903                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 904
 905 int lttng_syscalls_register_event_notifier(
 906                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 907                 void *filter);
 908 int lttng_syscals_create_matching_event_notifiers(
 909                 struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter);
 910 int lttng_syscalls_unregister_event_notifier_group(struct lttng_event_notifier_group *group);
 911 int lttng_syscall_filter_enable_event_notifier(struct lttng_event_notifier *event_notifier);
 912 int lttng_syscall_filter_disable_event_notifier(struct lttng_event_notifier *event_notifier);
 913 #else
 914 static inline int lttng_syscalls_register_event(
 915                 struct lttng_event_enabler *event_enabler, void *filter)
 916 {
 917         return -ENOSYS;
 918 }
 919
 920 static inline int lttng_syscalls_unregister_channel(struct lttng_channel *chan)
 921 {
 922         return 0;
 923 }
 924
 925 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 926 {
 927         return 0;
 928 }
 929
 930 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 931                 struct lttng_event *event);
 932 {
 933         return -ENOSYS;
 934 }
 935
 936 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 937                 struct lttng_event *event);
 938 {
 939         return -ENOSYS;
 940 }
 941
 942 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 943                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 944 {
 945         return -ENOSYS;
 946 }
 947
 948 static inline int lttng_syscalls_register_event_notifier(
 949                 struct lttng_event_notifier_group *group, void *filter)
 950 {
 951         return -ENOSYS;
 952 }
 953
 954 static inline int lttng_syscalls_unregister_event_notifier_group(
 955                 struct lttng_event_notifier_group *group)
 956 {
 957         return 0;
 958 }
 959
 960 static inline int lttng_syscall_filter_enable_event_notifier(
 961                 struct lttng_event_notifier_group *group,
 962                 const char *name)
 963 {
 964         return -ENOSYS;
 965 }
 966
 967 static inline int lttng_syscall_filter_disable_event_notifier(
 968                 struct lttng_event_notifier_group *group,
 969                 const char *name)
 970 {
 971         return -ENOSYS;
 972 }
 973
 974 #endif
 975
 976 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 977                 struct lttng_kernel_filter_bytecode __user *bytecode);
 978 int lttng_event_notifier_enabler_attach_filter_bytecode(
 979                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 980                 struct lttng_kernel_filter_bytecode __user *bytecode);
 981 int lttng_event_notifier_enabler_attach_capture_bytecode(
 982                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 983                 struct lttng_kernel_capture_bytecode __user *bytecode);
 984
 985 void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
 986                 struct lttng_ctx *ctx,
 987                 struct list_head *instance_bytecode_runtime_head,
 988                 struct list_head *enabler_bytecode_runtime_head);
 989
 990 int lttng_probes_init(void);
 991
 992 extern struct lttng_ctx *lttng_static_ctx;
 993
 994 int lttng_context_init(void);
 995 void lttng_context_exit(void);
 996 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 997 ssize_t lttng_append_context_index(struct lttng_ctx **ctx_p);
 998 struct lttng_ctx_field *lttng_get_context_field_from_index(struct lttng_ctx *ctx,
 999                 size_t index);
1000 void lttng_context_update(struct lttng_ctx *ctx);
1001 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
1002 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
1003 void lttng_remove_context_field(struct lttng_ctx **ctx,
1004                                 struct lttng_ctx_field *field);
1005 void lttng_remove_context_field_index(struct lttng_ctx **ctx_p, size_t index);
1006 void lttng_destroy_context(struct lttng_ctx *ctx);
1007 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
1008 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
1009 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
1010 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
1011 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
1012 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
1013 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
1014 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
1015 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
1016 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
1017 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
1018 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
1019 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
1020 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
1021 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
1022 #else
1023 static inline
1024 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
1025 {
1026         return -ENOSYS;
1027 }
1028 #endif
1029 #ifdef CONFIG_PREEMPT_RT_FULL
1030 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
1031 #else
1032 static inline
1033 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
1034 {
1035         return -ENOSYS;
1036 }
1037 #endif
1038
1039 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
1040
1041 #if defined(CONFIG_CGROUPS) && \
1042         ((LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) || \
1043          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
1044 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
1045 #else
1046 static inline
1047 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
1048 {
1049         return -ENOSYS;
1050 }
1051 #endif
1052
1053 #if defined(CONFIG_IPC_NS) && \
1054         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1055 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
1056 #else
1057 static inline
1058 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
1059 {
1060         return -ENOSYS;
1061 }
1062 #endif
1063
1064 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
1065         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1066 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
1067 #else
1068 static inline
1069 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
1070 {
1071         return -ENOSYS;
1072 }
1073 #endif
1074
1075 #if defined(CONFIG_NET_NS) && \
1076         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1077 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
1078 #else
1079 static inline
1080 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
1081 {
1082         return -ENOSYS;
1083 }
1084 #endif
1085
1086 #if defined(CONFIG_PID_NS) && \
1087         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1088 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
1089 #else
1090 static inline
1091 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
1092 {
1093         return -ENOSYS;
1094 }
1095 #endif
1096
1097 #if defined(CONFIG_USER_NS) && \
1098         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1099 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
1100 #else
1101 static inline
1102 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
1103 {
1104         return -ENOSYS;
1105 }
1106 #endif
1107
1108 #if defined(CONFIG_UTS_NS) && \
1109         (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
1110 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
1111 #else
1112 static inline
1113 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
1114 {
1115         return -ENOSYS;
1116 }
1117 #endif
1118
1119 #if defined(CONFIG_TIME_NS) && \
1120         (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
1121 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx);
1122 #else
1123 static inline
1124 int lttng_add_time_ns_to_ctx(struct lttng_ctx **ctx)
1125 {
1126         return -ENOSYS;
1127 }
1128 #endif
1129
1130 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
1131 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
1132 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
1133 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
1134 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
1135 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
1136 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
1137 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
1138 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
1139 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
1140 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
1141 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
1142
1143 #if defined(CONFIG_PERF_EVENTS)
1144 int lttng_add_perf_counter_to_ctx(uint32_t type,
1145                                   uint64_t config,
1146                                   const char *name,
1147                                   struct lttng_ctx **ctx);
1148 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1149                 struct lttng_cpuhp_node *node);
1150 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1151                 struct lttng_cpuhp_node *node);
1152 #else
1153 static inline
1154 int lttng_add_perf_counter_to_ctx(uint32_t type,
1155                                   uint64_t config,
1156                                   const char *name,
1157                                   struct lttng_ctx **ctx)
1158 {
1159         return -ENOSYS;
1160 }
1161 static inline
1162 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1163                 struct lttng_cpuhp_node *node)
1164 {
1165         return 0;
1166 }
1167 static inline
1168 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1169                 struct lttng_cpuhp_node *node)
1170 {
1171         return 0;
1172 }
1173 #endif
1174
1175 int lttng_logger_init(void);
1176 void lttng_logger_exit(void);
1177
1178 extern int lttng_statedump_start(struct lttng_session *session);
1179
1180 #ifdef CONFIG_KPROBES
1181 int lttng_kprobes_register_event(const char *name,
1182                 const char *symbol_name,
1183                 uint64_t offset,
1184                 uint64_t addr,
1185                 struct lttng_event *event);
1186 void lttng_kprobes_unregister_event(struct lttng_event *event);
1187 void lttng_kprobes_destroy_event_private(struct lttng_event *event);
1188 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1189                 uint64_t offset,
1190                 uint64_t addr,
1191                 struct lttng_event_notifier *event_notifier);
1192 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1193 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1194 #else
1195 static inline
1196 int lttng_kprobes_register_event(const char *name,
1197                 const char *symbol_name,
1198                 uint64_t offset,
1199                 uint64_t addr,
1200                 struct lttng_event *event)
1201 {
1202         return -ENOSYS;
1203 }
1204
1205 static inline
1206 void lttng_kprobes_unregister_event(struct lttng_event *event)
1207 {
1208 }
1209
1210 static inline
1211 void lttng_kprobes_destroy_event_private(struct lttng_event *event)
1212 {
1213 }
1214
1215 static inline
1216 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1217                 uint64_t offset,
1218                 uint64_t addr,
1219                 struct lttng_event_notifier *event_notifier)
1220 {
1221         return -ENOSYS;
1222 }
1223
1224 static inline
1225 void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1226 {
1227 }
1228
1229 static inline
1230 void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1231 {
1232 }
1233 #endif
1234
1235 int lttng_event_add_callsite(struct lttng_event *event,
1236         struct lttng_kernel_event_callsite *callsite);
1237
1238 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1239         struct lttng_kernel_event_callsite *callsite);
1240
1241 #ifdef CONFIG_UPROBES
1242 int lttng_uprobes_register_event(const char *name,
1243         int fd, struct lttng_event *event);
1244 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1245         struct lttng_kernel_event_callsite *callsite);
1246 void lttng_uprobes_unregister_event(struct lttng_event *event);
1247 void lttng_uprobes_destroy_event_private(struct lttng_event *event);
1248 int lttng_uprobes_register_event_notifier(const char *name,
1249         int fd, struct lttng_event_notifier *event_notifier);
1250 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1251         struct lttng_kernel_event_callsite *callsite);
1252 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier);
1253 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier);
1254 #else
1255 static inline
1256 int lttng_uprobes_register_event(const char *name,
1257         int fd, struct lttng_event *event)
1258 {
1259         return -ENOSYS;
1260 }
1261
1262 static inline
1263 int lttng_uprobes_event_add_callsite(struct lttng_event *event,
1264         struct lttng_kernel_event_callsite *callsite)
1265 {
1266         return -ENOSYS;
1267 }
1268
1269 static inline
1270 void lttng_uprobes_unregister_event(struct lttng_event *event)
1271 {
1272 }
1273
1274 static inline
1275 void lttng_uprobes_destroy_event_private(struct lttng_event *event)
1276 {
1277 }
1278
1279 static inline
1280 int lttng_uprobes_register_event_notifier(const char *name,
1281         int fd, struct lttng_event_notifier *event_notifier)
1282 {
1283         return -ENOSYS;
1284 }
1285
1286 static inline
1287 int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
1288         struct lttng_kernel_event_callsite *callsite)
1289 {
1290         return -ENOSYS;
1291 }
1292
1293 static inline
1294 void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
1295 {
1296 }
1297
1298 static inline
1299 void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
1300 {
1301 }
1302 #endif
1303
1304 #ifdef CONFIG_KRETPROBES
1305 int lttng_kretprobes_register(const char *name,
1306                 const char *symbol_name,
1307                 uint64_t offset,
1308                 uint64_t addr,
1309                 struct lttng_event *event_entry,
1310                 struct lttng_event *event_exit);
1311 void lttng_kretprobes_unregister(struct lttng_event *event);
1312 void lttng_kretprobes_destroy_private(struct lttng_event *event);
1313 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1314         int enable);
1315 #else
1316 static inline
1317 int lttng_kretprobes_register(const char *name,
1318                 const char *symbol_name,
1319                 uint64_t offset,
1320                 uint64_t addr,
1321                 struct lttng_event *event_entry,
1322                 struct lttng_event *event_exit)
1323 {
1324         return -ENOSYS;
1325 }
1326
1327 static inline
1328 void lttng_kretprobes_unregister(struct lttng_event *event)
1329 {
1330 }
1331
1332 static inline
1333 void lttng_kretprobes_destroy_private(struct lttng_event *event)
1334 {
1335 }
1336
1337 static inline
1338 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
1339         int enable)
1340 {
1341         return -ENOSYS;
1342 }
1343 #endif
1344
1345 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1346
1347 extern const struct file_operations lttng_tracepoint_list_fops;
1348 extern const struct file_operations lttng_syscall_list_fops;
1349
1350 #define TRACEPOINT_HAS_DATA_ARG
1351
1352 static inline bool lttng_is_bytewise_integer(const struct lttng_type *type)
1353 {
1354         if (type->atype != atype_integer)
1355                 return false;
1356         switch (type->u.integer.size) {
1357         case 8:         /* Fall-through. */
1358         case 16:        /* Fall-through. */
1359         case 32:        /* Fall-through. */
1360         case 64:
1361                 break;
1362         default:
1363                 return false;
1364         }
1365         return true;
1366 }
1367
1368 #endif /* _LTTNG_EVENTS_H */