lttng-events.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   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 <lttng-kernel-version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <lttng-cpuhotplug.h>
  18 #include <linux/uuid.h>
  19 #include <linux/irq_work.h>
  20 #include <wrapper/uprobes.h>
  21 #include <lttng-tracer.h>
  22 #include <lttng-abi.h>
  23 #include <lttng-abi-old.h>
  24
  25 #define lttng_is_signed_type(type)      (((type) -1) < (type) 1)
  26
  27 struct lttng_channel;
  28 struct lttng_session;
  29 struct lttng_metadata_cache;
  30 struct lib_ring_buffer_ctx;
  31 struct perf_event;
  32 struct perf_event_attr;
  33 struct lib_ring_buffer_config;
  34
  35 /* Type description */
  36
  37 enum abstract_types {
  38         atype_integer,
  39         atype_enum,
  40         atype_array,
  41         atype_sequence,
  42         atype_string,
  43         atype_struct,
  44         atype_array_compound,           /* Array of compound types. */
  45         atype_sequence_compound,        /* Sequence of compound types. */
  46         atype_variant,
  47         atype_array_bitfield,
  48         atype_sequence_bitfield,
  49         NR_ABSTRACT_TYPES,
  50 };
  51
  52 enum lttng_string_encodings {
  53         lttng_encode_none = 0,
  54         lttng_encode_UTF8 = 1,
  55         lttng_encode_ASCII = 2,
  56         NR_STRING_ENCODINGS,
  57 };
  58
  59 enum channel_type {
  60         PER_CPU_CHANNEL,
  61         METADATA_CHANNEL,
  62 };
  63
  64 struct lttng_enum_value {
  65         unsigned long long value;
  66         unsigned int signedness:1;
  67 };
  68
  69 struct lttng_enum_entry {
  70         struct lttng_enum_value start, end;     /* start and end are inclusive */
  71         const char *string;
  72         struct {
  73                 unsigned int is_auto:1;
  74         } options;
  75 };
  76
  77 #define __type_integer(_type, _size, _alignment, _signedness,   \
  78                 _byte_order, _user, _base, _encoding)           \
  79         {                                                       \
  80             .atype = atype_integer,                             \
  81             .u.basic.integer =                                  \
  82                 {                                               \
  83                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  84                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  85                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  86                   .reverse_byte_order = (_byte_order) != __BYTE_ORDER, \
  87                   .base = (_base),                              \
  88                   .user = (_user),                              \
  89                   .encoding = lttng_encode_##_encoding,         \
  90                 },                                              \
  91         }                                                       \
  92
  93 struct lttng_integer_type {
  94         unsigned int size;              /* in bits */
  95         unsigned short alignment;       /* in bits */
  96         unsigned int signedness:1,
  97                 reverse_byte_order:1,
  98                 user:1;                 /* fetch from user-space */
  99         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 100         enum lttng_string_encodings encoding;
 101 };
 102
 103 union _lttng_basic_type {
 104         struct lttng_integer_type integer;
 105         struct {
 106                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 107                 struct lttng_integer_type container_type;
 108         } enumeration;
 109         struct {
 110                 enum lttng_string_encodings encoding;
 111                 unsigned int user:1;                    /* fetch from user-space */
 112         } string;
 113 };
 114
 115 struct lttng_basic_type {
 116         enum abstract_types atype;
 117         union {
 118                 union _lttng_basic_type basic;
 119         } u;
 120 };
 121
 122 struct lttng_type {
 123         enum abstract_types atype;
 124         union {
 125                 union _lttng_basic_type basic;
 126                 struct {
 127                         struct lttng_basic_type elem_type;
 128                         unsigned int length;            /* num. elems. */
 129                         unsigned int elem_alignment;    /* alignment override */
 130                 } array;
 131                 struct {
 132                         struct lttng_basic_type length_type;
 133                         struct lttng_basic_type elem_type;
 134                         unsigned int elem_alignment;    /* alignment override */
 135                 } sequence;
 136                 struct {
 137                         uint32_t nr_fields;
 138                         struct lttng_event_field *fields; /* Array of fields. */
 139                 } _struct;
 140                 struct {
 141                         struct lttng_type *elem_type;
 142                         unsigned int length;            /* num. elems. */
 143                 } array_compound;
 144                 struct {
 145                         struct lttng_type *elem_type;
 146                         const char *length_name;
 147                 } sequence_compound;
 148                 struct {
 149                         const char *tag_name;
 150                         struct lttng_event_field *choices; /* Array of fields. */
 151                         uint32_t nr_choices;
 152                 } variant;
 153         } u;
 154 };
 155
 156 struct lttng_enum_desc {
 157         const char *name;
 158         const struct lttng_enum_entry *entries;
 159         unsigned int nr_entries;
 160 };
 161
 162 /* Event field description */
 163
 164 struct lttng_event_field {
 165         const char *name;
 166         struct lttng_type type;
 167         unsigned int nowrite:1;         /* do not write into trace */
 168 };
 169
 170 union lttng_ctx_value {
 171         int64_t s64;
 172         const char *str;
 173         double d;
 174 };
 175
 176 /*
 177  * We need to keep this perf counter field separately from struct
 178  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 179  */
 180 struct lttng_perf_counter_field {
 181 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
 182         struct lttng_cpuhp_node cpuhp_prepare;
 183         struct lttng_cpuhp_node cpuhp_online;
 184 #else
 185         struct notifier_block nb;
 186         int hp_enable;
 187 #endif
 188         struct perf_event_attr *attr;
 189         struct perf_event **e;  /* per-cpu array */
 190 };
 191
 192 struct lttng_probe_ctx {
 193         struct lttng_event *event;
 194         uint8_t interruptible;
 195 };
 196
 197 struct lttng_ctx_field {
 198         struct lttng_event_field event_field;
 199         size_t (*get_size)(size_t offset);
 200         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 201                                struct lib_ring_buffer_ctx *ctx,
 202                                struct lttng_channel *chan);
 203         void (*record)(struct lttng_ctx_field *field,
 204                        struct lib_ring_buffer_ctx *ctx,
 205                        struct lttng_channel *chan);
 206         void (*get_value)(struct lttng_ctx_field *field,
 207                          struct lttng_probe_ctx *lttng_probe_ctx,
 208                          union lttng_ctx_value *value);
 209         union {
 210                 struct lttng_perf_counter_field *perf_counter;
 211         } u;
 212         void (*destroy)(struct lttng_ctx_field *field);
 213         /*
 214          * Private data to keep state between get_size and record.
 215          * User must perform its own synchronization to protect against
 216          * concurrent and reentrant contexts.
 217          */
 218         void *priv;
 219 };
 220
 221 struct lttng_ctx {
 222         struct lttng_ctx_field *fields;
 223         unsigned int nr_fields;
 224         unsigned int allocated_fields;
 225         size_t largest_align;   /* in bytes */
 226 };
 227
 228 struct lttng_event_desc {
 229         const char *name;               /* lttng-modules name */
 230         const char *kname;              /* Linux kernel name (tracepoints) */
 231         void *probe_callback;
 232         const struct lttng_event_ctx *ctx;      /* context */
 233         const struct lttng_event_field *fields; /* event payload */
 234         unsigned int nr_fields;
 235         struct module *owner;
 236 };
 237
 238 struct lttng_probe_desc {
 239         const char *provider;
 240         const struct lttng_event_desc **event_desc;
 241         unsigned int nr_events;
 242         struct list_head head;                  /* chain registered probes */
 243         struct list_head lazy_init_head;
 244         int lazy;                               /* lazy registration */
 245 };
 246
 247 struct lttng_krp;                               /* Kretprobe handling */
 248
 249 enum lttng_event_type {
 250         LTTNG_TYPE_EVENT = 0,
 251         LTTNG_TYPE_ENABLER = 1,
 252 };
 253
 254 struct lttng_filter_bytecode_node {
 255         struct list_head node;
 256         struct lttng_enabler *enabler;
 257         /*
 258          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 259          * last field.
 260          */
 261         struct lttng_kernel_filter_bytecode bc;
 262 };
 263
 264 /*
 265  * Filter return value masks.
 266  */
 267 enum lttng_filter_ret {
 268         LTTNG_FILTER_DISCARD = 0,
 269         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 270         /* Other bits are kept for future use. */
 271 };
 272
 273 struct lttng_bytecode_runtime {
 274         /* Associated bytecode */
 275         struct lttng_filter_bytecode_node *bc;
 276         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 277                         const char *filter_stack_data);
 278         int link_failed;
 279         struct list_head node;  /* list of bytecode runtime in event */
 280         struct lttng_event *event;
 281 };
 282
 283 /*
 284  * Objects in a linked-list of enablers, owned by an event.
 285  */
 286 struct lttng_enabler_ref {
 287         struct list_head node;                  /* enabler ref list */
 288         struct lttng_enabler *ref;              /* backward ref */
 289 };
 290
 291 struct lttng_uprobe_handler {
 292         struct lttng_event *event;
 293         loff_t offset;
 294         struct uprobe_consumer up_consumer;
 295         struct list_head node;
 296 };
 297
 298 enum lttng_syscall_entryexit {
 299         LTTNG_SYSCALL_ENTRY,
 300         LTTNG_SYSCALL_EXIT,
 301 };
 302
 303 enum lttng_syscall_abi {
 304         LTTNG_SYSCALL_ABI_NATIVE,
 305         LTTNG_SYSCALL_ABI_COMPAT,
 306 };
 307
 308 /*
 309  * lttng_event structure is referred to by the tracing fast path. It must be
 310  * kept small.
 311  */
 312 struct lttng_event {
 313         enum lttng_event_type evtype;   /* First field. */
 314         unsigned int id;
 315         struct lttng_channel *chan;
 316         int enabled;
 317         const struct lttng_event_desc *desc;
 318         void *filter;
 319         struct lttng_ctx *ctx;
 320         enum lttng_kernel_instrumentation instrumentation;
 321         union {
 322                 struct {
 323                         struct kprobe kp;
 324                         char *symbol_name;
 325                 } kprobe;
 326                 struct {
 327                         struct lttng_krp *lttng_krp;
 328                         char *symbol_name;
 329                 } kretprobe;
 330                 struct {
 331                         struct inode *inode;
 332                         struct list_head head;
 333                 } uprobe;
 334                 struct {
 335                         char *syscall_name;
 336                         enum lttng_syscall_entryexit entryexit;
 337                         enum lttng_syscall_abi abi;
 338                 } syscall;
 339         } u;
 340         struct list_head list;          /* Event list in session */
 341         unsigned int metadata_dumped:1;
 342
 343         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 344         struct list_head enablers_ref_head;
 345         struct hlist_node hlist;        /* session ht of events */
 346         int registered;                 /* has reg'd tracepoint probe */
 347         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 348         struct list_head bytecode_runtime_head;
 349         int has_enablers_without_bytecode;
 350 };
 351
 352 enum lttng_enabler_type {
 353         LTTNG_ENABLER_STAR_GLOB,
 354         LTTNG_ENABLER_NAME,
 355 };
 356
 357 /*
 358  * Enabler field, within whatever object is enabling an event. Target of
 359  * backward reference.
 360  */
 361 struct lttng_enabler {
 362         enum lttng_event_type evtype;   /* First field. */
 363
 364         enum lttng_enabler_type type;
 365
 366         struct list_head node;  /* per-session list of enablers */
 367         /* head list of struct lttng_ust_filter_bytecode_node */
 368         struct list_head filter_bytecode_head;
 369
 370         struct lttng_kernel_event event_param;
 371         struct lttng_channel *chan;
 372         struct lttng_ctx *ctx;
 373         unsigned int enabled:1;
 374 };
 375
 376 struct lttng_channel_ops {
 377         struct channel *(*channel_create)(const char *name,
 378                                 struct lttng_channel *lttng_chan,
 379                                 void *buf_addr,
 380                                 size_t subbuf_size, size_t num_subbuf,
 381                                 unsigned int switch_timer_interval,
 382                                 unsigned int read_timer_interval);
 383         void (*channel_destroy)(struct channel *chan);
 384         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 385         int (*buffer_has_read_closed_stream)(struct channel *chan);
 386         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 387         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 388                              uint32_t event_id);
 389         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 390         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 391                             size_t len);
 392         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 393                                       const void *src, size_t len);
 394         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 395                              int c, size_t len);
 396         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 397                              size_t len);
 398         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 399                                        const char __user *src, size_t len);
 400         /*
 401          * packet_avail_size returns the available size in the current
 402          * packet. Note that the size returned is only a hint, since it
 403          * may change due to concurrent writes.
 404          */
 405         size_t (*packet_avail_size)(struct channel *chan);
 406         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 407         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 408         int (*is_finalized)(struct channel *chan);
 409         int (*is_disabled)(struct channel *chan);
 410         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 411                         struct lib_ring_buffer *bufb,
 412                         uint64_t *timestamp_begin);
 413         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 414                         struct lib_ring_buffer *bufb,
 415                         uint64_t *timestamp_end);
 416         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 417                         struct lib_ring_buffer *bufb,
 418                         uint64_t *events_discarded);
 419         int (*content_size) (const struct lib_ring_buffer_config *config,
 420                         struct lib_ring_buffer *bufb,
 421                         uint64_t *content_size);
 422         int (*packet_size) (const struct lib_ring_buffer_config *config,
 423                         struct lib_ring_buffer *bufb,
 424                         uint64_t *packet_size);
 425         int (*stream_id) (const struct lib_ring_buffer_config *config,
 426                         struct lib_ring_buffer *bufb,
 427                         uint64_t *stream_id);
 428         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 429                         struct lib_ring_buffer *bufb,
 430                         uint64_t *ts);
 431         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 432                         struct lib_ring_buffer *bufb,
 433                         uint64_t *seq);
 434         int (*instance_id) (const struct lib_ring_buffer_config *config,
 435                         struct lib_ring_buffer *bufb,
 436                         uint64_t *id);
 437 };
 438
 439 struct lttng_transport {
 440         char *name;
 441         struct module *owner;
 442         struct list_head node;
 443         struct lttng_channel_ops ops;
 444 };
 445
 446 struct lttng_syscall_filter;
 447
 448 #define LTTNG_EVENT_HT_BITS             12
 449 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 450
 451 struct lttng_event_ht {
 452         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 453 };
 454
 455 struct lttng_channel {
 456         unsigned int id;
 457         struct channel *chan;           /* Channel buffers */
 458         int enabled;
 459         struct lttng_ctx *ctx;
 460         /* Event ID management */
 461         struct lttng_session *session;
 462         struct file *file;              /* File associated to channel */
 463         unsigned int free_event_id;     /* Next event ID to allocate */
 464         struct list_head list;          /* Channel list */
 465         struct lttng_channel_ops *ops;
 466         struct lttng_transport *transport;
 467         struct lttng_event **sc_table;  /* for syscall tracing */
 468         struct lttng_event **compat_sc_table;
 469         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 470         struct lttng_event **compat_sc_exit_table;
 471         struct lttng_event *sc_unknown; /* for unknown syscalls */
 472         struct lttng_event *sc_compat_unknown;
 473         struct lttng_event *sc_exit_unknown;
 474         struct lttng_event *compat_sc_exit_unknown;
 475         struct lttng_syscall_filter *sc_filter;
 476         int header_type;                /* 0: unset, 1: compact, 2: large */
 477         enum channel_type channel_type;
 478         int syscall_all;
 479         unsigned int metadata_dumped:1,
 480                 sys_enter_registered:1,
 481                 sys_exit_registered:1,
 482                 tstate:1;               /* Transient enable state */
 483 };
 484
 485 struct lttng_metadata_stream {
 486         void *priv;                     /* Ring buffer private data */
 487         struct lttng_metadata_cache *metadata_cache;
 488         unsigned int metadata_in;       /* Bytes read from the cache */
 489         unsigned int metadata_out;      /* Bytes consumed from stream */
 490         int finalized;                  /* Has channel been finalized */
 491         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 492         struct list_head list;          /* Stream list */
 493         struct lttng_transport *transport;
 494         uint64_t version;               /* Current version of the metadata cache */
 495         bool coherent;                  /* Stream in a coherent state */
 496 };
 497
 498 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 499
 500 struct lttng_dynamic_len_stack {
 501         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 502         size_t offset;
 503 };
 504
 505 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 506
 507 /*
 508  * struct lttng_id_tracker declared in header due to deferencing of *v
 509  * in RCU_INITIALIZER(v).
 510  */
 511 #define LTTNG_ID_HASH_BITS      6
 512 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 513
 514 enum tracker_type {
 515         TRACKER_PID,
 516         TRACKER_VPID,
 517         TRACKER_UID,
 518         TRACKER_VUID,
 519         TRACKER_GID,
 520         TRACKER_VGID,
 521
 522         TRACKER_UNKNOWN,
 523 };
 524
 525 struct lttng_id_tracker_rcu {
 526         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 527 };
 528
 529 struct lttng_id_tracker {
 530         struct lttng_session *session;
 531         enum tracker_type tracker_type;
 532         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 533 };
 534
 535 struct lttng_id_hash_node {
 536         struct hlist_node hlist;
 537         int id;
 538 };
 539
 540 struct lttng_session {
 541         int active;                     /* Is trace session active ? */
 542         int been_active;                /* Has trace session been active ? */
 543         struct file *file;              /* File associated to session */
 544         struct list_head chan;          /* Channel list head */
 545         struct list_head events;        /* Event list head */
 546         struct list_head list;          /* Session list */
 547         unsigned int free_chan_id;      /* Next chan ID to allocate */
 548         uuid_le uuid;                   /* Trace session unique ID */
 549         struct lttng_metadata_cache *metadata_cache;
 550         struct lttng_id_tracker pid_tracker;
 551         struct lttng_id_tracker vpid_tracker;
 552         struct lttng_id_tracker uid_tracker;
 553         struct lttng_id_tracker vuid_tracker;
 554         struct lttng_id_tracker gid_tracker;
 555         struct lttng_id_tracker vgid_tracker;
 556         unsigned int metadata_dumped:1,
 557                 tstate:1;               /* Transient enable state */
 558         /* List of enablers */
 559         struct list_head enablers_head;
 560         /* Hash table of events */
 561         struct lttng_event_ht events_ht;
 562         char name[LTTNG_KERNEL_SESSION_NAME_LEN];
 563         char creation_time[LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN];
 564 };
 565
 566 struct lttng_metadata_cache {
 567         char *data;                     /* Metadata cache */
 568         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 569         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 570         atomic_t producing;             /* Metadata being produced (incomplete) */
 571         struct kref refcount;           /* Metadata cache usage */
 572         struct list_head metadata_stream;       /* Metadata stream list */
 573         uuid_le uuid;                   /* Trace session unique ID (copy) */
 574         struct mutex lock;              /* Produce/consume lock */
 575         uint64_t version;               /* Current version of the metadata */
 576 };
 577
 578 void lttng_lock_sessions(void);
 579 void lttng_unlock_sessions(void);
 580
 581 struct list_head *lttng_get_probe_list_head(void);
 582
 583 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 584                 struct lttng_kernel_event *event_param,
 585                 struct lttng_channel *chan);
 586
 587 int lttng_enabler_enable(struct lttng_enabler *enabler);
 588 int lttng_enabler_disable(struct lttng_enabler *enabler);
 589 int lttng_fix_pending_events(void);
 590 int lttng_session_active(void);
 591
 592 struct lttng_session *lttng_session_create(void);
 593 int lttng_session_enable(struct lttng_session *session);
 594 int lttng_session_disable(struct lttng_session *session);
 595 void lttng_session_destroy(struct lttng_session *session);
 596 int lttng_session_metadata_regenerate(struct lttng_session *session);
 597 int lttng_session_statedump(struct lttng_session *session);
 598 void metadata_cache_destroy(struct kref *kref);
 599
 600 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 601                                        const char *transport_name,
 602                                        void *buf_addr,
 603                                        size_t subbuf_size, size_t num_subbuf,
 604                                        unsigned int switch_timer_interval,
 605                                        unsigned int read_timer_interval,
 606                                        enum channel_type channel_type);
 607 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 608                                        int overwrite, void *buf_addr,
 609                                        size_t subbuf_size, size_t num_subbuf,
 610                                        unsigned int switch_timer_interval,
 611                                        unsigned int read_timer_interval);
 612
 613 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 614 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 615                                 struct lttng_kernel_event *event_param,
 616                                 void *filter,
 617                                 const struct lttng_event_desc *event_desc,
 618                                 enum lttng_kernel_instrumentation itype);
 619 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 620                                 struct lttng_kernel_event *event_param,
 621                                 void *filter,
 622                                 const struct lttng_event_desc *event_desc,
 623                                 enum lttng_kernel_instrumentation itype);
 624 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 625                 struct lttng_kernel_old_event *old_event_param,
 626                 void *filter,
 627                 const struct lttng_event_desc *internal_desc);
 628
 629 int lttng_channel_enable(struct lttng_channel *channel);
 630 int lttng_channel_disable(struct lttng_channel *channel);
 631 int lttng_event_enable(struct lttng_event *event);
 632 int lttng_event_disable(struct lttng_event *event);
 633
 634 void lttng_transport_register(struct lttng_transport *transport);
 635 void lttng_transport_unregister(struct lttng_transport *transport);
 636
 637 void synchronize_trace(void);
 638 int lttng_abi_init(void);
 639 int lttng_abi_compat_old_init(void);
 640 void lttng_abi_exit(void);
 641 void lttng_abi_compat_old_exit(void);
 642
 643 int lttng_probe_register(struct lttng_probe_desc *desc);
 644 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 645 const struct lttng_event_desc *lttng_event_get(const char *name);
 646 void lttng_event_put(const struct lttng_event_desc *desc);
 647 int lttng_probes_init(void);
 648 void lttng_probes_exit(void);
 649
 650 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 651                 struct channel *chan, bool *coherent);
 652
 653 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 654 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 655 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 656 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 657 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 658 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 659
 660 int lttng_session_track_id(struct lttng_session *session,
 661                 enum tracker_type tracker_type, int id);
 662 int lttng_session_untrack_id(struct lttng_session *session,
 663                 enum tracker_type tracker_type, int id);
 664
 665 int lttng_session_list_tracker_ids(struct lttng_session *session,
 666                 enum tracker_type tracker_type);
 667
 668 void lttng_clock_ref(void);
 669 void lttng_clock_unref(void);
 670
 671 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 672 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 673 int lttng_syscalls_unregister(struct lttng_channel *chan);
 674 int lttng_syscalls_destroy(struct lttng_channel *chan);
 675 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 676                 struct lttng_event *event);
 677 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 678                 struct lttng_event *event);
 679 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 680                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 681 #else
 682 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 683 {
 684         return -ENOSYS;
 685 }
 686
 687 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 688 {
 689         return 0;
 690 }
 691
 692 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 693 {
 694         return 0;
 695 }
 696
 697 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 698                 struct lttng_event *event)
 699 {
 700         return -ENOSYS;
 701 }
 702
 703 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 704                 struct lttng_event *event)
 705 {
 706         return -ENOSYS;
 707 }
 708
 709 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 710                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 711 {
 712         return -ENOSYS;
 713 }
 714 #endif
 715
 716 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 717 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 718                 struct lttng_kernel_filter_bytecode __user *bytecode);
 719 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 720                 struct lttng_enabler *enabler);
 721 void lttng_free_event_filter_runtime(struct lttng_event *event);
 722
 723 int lttng_probes_init(void);
 724
 725 extern struct lttng_ctx *lttng_static_ctx;
 726
 727 int lttng_context_init(void);
 728 void lttng_context_exit(void);
 729 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 730 void lttng_context_update(struct lttng_ctx *ctx);
 731 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 732 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 733 void lttng_remove_context_field(struct lttng_ctx **ctx,
 734                                 struct lttng_ctx_field *field);
 735 void lttng_destroy_context(struct lttng_ctx *ctx);
 736 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 737 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 738 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 739 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 740 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 741 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 742 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 743 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 744 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 745 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 746 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 747 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 748 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 749 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 750 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 751 #else
 752 static inline
 753 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 754 {
 755         return -ENOSYS;
 756 }
 757 #endif
 758 #ifdef CONFIG_PREEMPT_RT_FULL
 759 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 760 #else
 761 static inline
 762 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 763 {
 764         return -ENOSYS;
 765 }
 766 #endif
 767
 768 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 769
 770 #if defined(CONFIG_CGROUPS) && \
 771         ((LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) || \
 772          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
 773 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx);
 774 #else
 775 static inline
 776 int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
 777 {
 778         return -ENOSYS;
 779 }
 780 #endif
 781
 782 #if defined(CONFIG_IPC_NS) && \
 783         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 784 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx);
 785 #else
 786 static inline
 787 int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
 788 {
 789         return -ENOSYS;
 790 }
 791 #endif
 792
 793 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
 794         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 795 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx);
 796 #else
 797 static inline
 798 int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
 799 {
 800         return -ENOSYS;
 801 }
 802 #endif
 803
 804 #if defined(CONFIG_NET_NS) && \
 805         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 806 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx);
 807 #else
 808 static inline
 809 int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
 810 {
 811         return -ENOSYS;
 812 }
 813 #endif
 814
 815 #if defined(CONFIG_PID_NS) && \
 816         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 817 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx);
 818 #else
 819 static inline
 820 int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
 821 {
 822         return -ENOSYS;
 823 }
 824 #endif
 825
 826 #if defined(CONFIG_USER_NS) && \
 827         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 828 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx);
 829 #else
 830 static inline
 831 int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
 832 {
 833         return -ENOSYS;
 834 }
 835 #endif
 836
 837 #if defined(CONFIG_UTS_NS) && \
 838         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
 839 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx);
 840 #else
 841 static inline
 842 int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
 843 {
 844         return -ENOSYS;
 845 }
 846 #endif
 847
 848 int lttng_add_uid_to_ctx(struct lttng_ctx **ctx);
 849 int lttng_add_euid_to_ctx(struct lttng_ctx **ctx);
 850 int lttng_add_suid_to_ctx(struct lttng_ctx **ctx);
 851 int lttng_add_gid_to_ctx(struct lttng_ctx **ctx);
 852 int lttng_add_egid_to_ctx(struct lttng_ctx **ctx);
 853 int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx);
 854 int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx);
 855 int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx);
 856 int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx);
 857 int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx);
 858 int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx);
 859 int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx);
 860
 861 #if defined(CONFIG_PERF_EVENTS)
 862 int lttng_add_perf_counter_to_ctx(uint32_t type,
 863                                   uint64_t config,
 864                                   const char *name,
 865                                   struct lttng_ctx **ctx);
 866 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 867                 struct lttng_cpuhp_node *node);
 868 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 869                 struct lttng_cpuhp_node *node);
 870 #else
 871 static inline
 872 int lttng_add_perf_counter_to_ctx(uint32_t type,
 873                                   uint64_t config,
 874                                   const char *name,
 875                                   struct lttng_ctx **ctx)
 876 {
 877         return -ENOSYS;
 878 }
 879 static inline
 880 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 881                 struct lttng_cpuhp_node *node)
 882 {
 883         return 0;
 884 }
 885 static inline
 886 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 887                 struct lttng_cpuhp_node *node)
 888 {
 889         return 0;
 890 }
 891 #endif
 892
 893 int lttng_logger_init(void);
 894 void lttng_logger_exit(void);
 895
 896 extern int lttng_statedump_start(struct lttng_session *session);
 897
 898 #ifdef CONFIG_KPROBES
 899 int lttng_kprobes_register(const char *name,
 900                 const char *symbol_name,
 901                 uint64_t offset,
 902                 uint64_t addr,
 903                 struct lttng_event *event);
 904 void lttng_kprobes_unregister(struct lttng_event *event);
 905 void lttng_kprobes_destroy_private(struct lttng_event *event);
 906 #else
 907 static inline
 908 int lttng_kprobes_register(const char *name,
 909                 const char *symbol_name,
 910                 uint64_t offset,
 911                 uint64_t addr,
 912                 struct lttng_event *event)
 913 {
 914         return -ENOSYS;
 915 }
 916
 917 static inline
 918 void lttng_kprobes_unregister(struct lttng_event *event)
 919 {
 920 }
 921
 922 static inline
 923 void lttng_kprobes_destroy_private(struct lttng_event *event)
 924 {
 925 }
 926 #endif
 927
 928 int lttng_event_add_callsite(struct lttng_event *event,
 929         struct lttng_kernel_event_callsite *callsite);
 930
 931 #ifdef CONFIG_UPROBES
 932 int lttng_uprobes_register(const char *name,
 933         int fd, struct lttng_event *event);
 934 int lttng_uprobes_add_callsite(struct lttng_event *event,
 935         struct lttng_kernel_event_callsite *callsite);
 936 void lttng_uprobes_unregister(struct lttng_event *event);
 937 void lttng_uprobes_destroy_private(struct lttng_event *event);
 938 #else
 939 static inline
 940 int lttng_uprobes_register(const char *name,
 941         int fd, struct lttng_event *event)
 942 {
 943         return -ENOSYS;
 944 }
 945
 946 static inline
 947 int lttng_uprobes_add_callsite(struct lttng_event *event,
 948         struct lttng_kernel_event_callsite *callsite)
 949 {
 950         return -ENOSYS;
 951 }
 952
 953 static inline
 954 void lttng_uprobes_unregister(struct lttng_event *event)
 955 {
 956 }
 957
 958 static inline
 959 void lttng_uprobes_destroy_private(struct lttng_event *event)
 960 {
 961 }
 962 #endif
 963
 964 #ifdef CONFIG_KRETPROBES
 965 int lttng_kretprobes_register(const char *name,
 966                 const char *symbol_name,
 967                 uint64_t offset,
 968                 uint64_t addr,
 969                 struct lttng_event *event_entry,
 970                 struct lttng_event *event_exit);
 971 void lttng_kretprobes_unregister(struct lttng_event *event);
 972 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 973 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 974         int enable);
 975 #else
 976 static inline
 977 int lttng_kretprobes_register(const char *name,
 978                 const char *symbol_name,
 979                 uint64_t offset,
 980                 uint64_t addr,
 981                 struct lttng_event *event_entry,
 982                 struct lttng_event *event_exit)
 983 {
 984         return -ENOSYS;
 985 }
 986
 987 static inline
 988 void lttng_kretprobes_unregister(struct lttng_event *event)
 989 {
 990 }
 991
 992 static inline
 993 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 994 {
 995 }
 996
 997 static inline
 998 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 999         int enable)
1000 {
1001         return -ENOSYS;
1002 }
1003 #endif
1004
1005 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
1006
1007 extern const struct file_operations lttng_tracepoint_list_fops;
1008 extern const struct file_operations lttng_syscall_list_fops;
1009
1010 #define TRACEPOINT_HAS_DATA_ARG
1011
1012 #endif /* _LTTNG_EVENTS_H */