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