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 <linux/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 <wrapper/uprobes.h>
  20 #include <lttng-tracer.h>
  21 #include <lttng-abi.h>
  22 #include <lttng-abi-old.h>
  23
  24 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  25
  26 struct lttng_channel;
  27 struct lttng_session;
  28 struct lttng_metadata_cache;
  29 struct lib_ring_buffer_ctx;
  30 struct perf_event;
  31 struct perf_event_attr;
  32 struct lib_ring_buffer_config;
  33
  34 /* Type description */
  35
  36 enum abstract_types {
  37         atype_integer,
  38         atype_enum,
  39         atype_array,
  40         atype_sequence,
  41         atype_string,
  42         atype_struct,
  43         atype_array_compound,           /* Array of compound types. */
  44         atype_sequence_compound,        /* Sequence of compound types. */
  45         atype_variant,
  46         atype_array_bitfield,
  47         atype_sequence_bitfield,
  48         NR_ABSTRACT_TYPES,
  49 };
  50
  51 enum lttng_string_encodings {
  52         lttng_encode_none = 0,
  53         lttng_encode_UTF8 = 1,
  54         lttng_encode_ASCII = 2,
  55         NR_STRING_ENCODINGS,
  56 };
  57
  58 enum channel_type {
  59         PER_CPU_CHANNEL,
  60         METADATA_CHANNEL,
  61 };
  62
  63 struct lttng_enum_value {
  64         unsigned long long value;
  65         unsigned int signedness:1;
  66 };
  67
  68 struct lttng_enum_entry {
  69         struct lttng_enum_value start, end;     /* start and end are inclusive */
  70         const char *string;
  71         struct {
  72                 unsigned int is_auto:1;
  73         } options;
  74 };
  75
  76 #define __type_integer(_type, _size, _alignment, _signedness,   \
  77                 _byte_order, _base, _encoding)  \
  78         {                                                       \
  79             .atype = atype_integer,                             \
  80             .u.basic.integer =                                  \
  81                 {                                               \
  82                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  83                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  84                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  85                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  86                   .base = _base,                                \
  87                   .encoding = lttng_encode_##_encoding,         \
  88                 },                                              \
  89         }                                                       \
  90
  91 struct lttng_integer_type {
  92         unsigned int size;              /* in bits */
  93         unsigned short alignment;       /* in bits */
  94         unsigned int signedness:1,
  95                 reverse_byte_order:1;
  96         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  97         enum lttng_string_encodings encoding;
  98 };
  99
 100 union _lttng_basic_type {
 101         struct lttng_integer_type integer;
 102         struct {
 103                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 104                 struct lttng_integer_type container_type;
 105         } enumeration;
 106         struct {
 107                 enum lttng_string_encodings encoding;
 108         } string;
 109 };
 110
 111 struct lttng_basic_type {
 112         enum abstract_types atype;
 113         union {
 114                 union _lttng_basic_type basic;
 115         } u;
 116 };
 117
 118 struct lttng_type {
 119         enum abstract_types atype;
 120         union {
 121                 union _lttng_basic_type basic;
 122                 struct {
 123                         struct lttng_basic_type elem_type;
 124                         unsigned int length;            /* num. elems. */
 125                         unsigned int elem_alignment;    /* alignment override */
 126                 } array;
 127                 struct {
 128                         struct lttng_basic_type length_type;
 129                         struct lttng_basic_type elem_type;
 130                         unsigned int elem_alignment;    /* alignment override */
 131                 } sequence;
 132                 struct {
 133                         uint32_t nr_fields;
 134                         struct lttng_event_field *fields; /* Array of fields. */
 135                 } _struct;
 136                 struct {
 137                         struct lttng_type *elem_type;
 138                         unsigned int length;            /* num. elems. */
 139                 } array_compound;
 140                 struct {
 141                         struct lttng_type *elem_type;
 142                         const char *length_name;
 143                 } sequence_compound;
 144                 struct {
 145                         const char *tag_name;
 146                         struct lttng_event_field *choices; /* Array of fields. */
 147                         uint32_t nr_choices;
 148                 } variant;
 149         } u;
 150 };
 151
 152 struct lttng_enum_desc {
 153         const char *name;
 154         const struct lttng_enum_entry *entries;
 155         unsigned int nr_entries;
 156 };
 157
 158 /* Event field description */
 159
 160 struct lttng_event_field {
 161         const char *name;
 162         struct lttng_type type;
 163         unsigned int nowrite:1,         /* do not write into trace */
 164                         user:1;         /* fetch from user-space */
 165 };
 166
 167 union lttng_ctx_value {
 168         int64_t s64;
 169         const char *str;
 170         double d;
 171 };
 172
 173 /*
 174  * We need to keep this perf counter field separately from struct
 175  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 176  */
 177 struct lttng_perf_counter_field {
 178 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
 179         struct lttng_cpuhp_node cpuhp_prepare;
 180         struct lttng_cpuhp_node cpuhp_online;
 181 #else
 182         struct notifier_block nb;
 183         int hp_enable;
 184 #endif
 185         struct perf_event_attr *attr;
 186         struct perf_event **e;  /* per-cpu array */
 187 };
 188
 189 struct lttng_probe_ctx {
 190         struct lttng_event *event;
 191         uint8_t interruptible;
 192 };
 193
 194 struct lttng_ctx_field {
 195         struct lttng_event_field event_field;
 196         size_t (*get_size)(size_t offset);
 197         size_t (*get_size_arg)(size_t offset, struct lttng_ctx_field *field,
 198                                struct lib_ring_buffer_ctx *ctx,
 199                                struct lttng_channel *chan);
 200         void (*record)(struct lttng_ctx_field *field,
 201                        struct lib_ring_buffer_ctx *ctx,
 202                        struct lttng_channel *chan);
 203         void (*get_value)(struct lttng_ctx_field *field,
 204                          struct lttng_probe_ctx *lttng_probe_ctx,
 205                          union lttng_ctx_value *value);
 206         union {
 207                 struct lttng_perf_counter_field *perf_counter;
 208         } u;
 209         void (*destroy)(struct lttng_ctx_field *field);
 210         /*
 211          * Private data to keep state between get_size and record.
 212          * User must perform its own synchronization to protect against
 213          * concurrent and reentrant contexts.
 214          */
 215         void *priv;
 216 };
 217
 218 struct lttng_ctx {
 219         struct lttng_ctx_field *fields;
 220         unsigned int nr_fields;
 221         unsigned int allocated_fields;
 222         size_t largest_align;   /* in bytes */
 223 };
 224
 225 struct lttng_event_desc {
 226         const char *name;               /* lttng-modules name */
 227         const char *kname;              /* Linux kernel name (tracepoints) */
 228         void *probe_callback;
 229         const struct lttng_event_ctx *ctx;      /* context */
 230         const struct lttng_event_field *fields; /* event payload */
 231         unsigned int nr_fields;
 232         struct module *owner;
 233 };
 234
 235 struct lttng_probe_desc {
 236         const char *provider;
 237         const struct lttng_event_desc **event_desc;
 238         unsigned int nr_events;
 239         struct list_head head;                  /* chain registered probes */
 240         struct list_head lazy_init_head;
 241         int lazy;                               /* lazy registration */
 242 };
 243
 244 struct lttng_krp;                               /* Kretprobe handling */
 245
 246 enum lttng_event_type {
 247         LTTNG_TYPE_EVENT = 0,
 248         LTTNG_TYPE_ENABLER = 1,
 249 };
 250
 251 struct lttng_filter_bytecode_node {
 252         struct list_head node;
 253         struct lttng_enabler *enabler;
 254         /*
 255          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 256          * last field.
 257          */
 258         struct lttng_kernel_filter_bytecode bc;
 259 };
 260
 261 /*
 262  * Filter return value masks.
 263  */
 264 enum lttng_filter_ret {
 265         LTTNG_FILTER_DISCARD = 0,
 266         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 267         /* Other bits are kept for future use. */
 268 };
 269
 270 struct lttng_bytecode_runtime {
 271         /* Associated bytecode */
 272         struct lttng_filter_bytecode_node *bc;
 273         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 274                         const char *filter_stack_data);
 275         int link_failed;
 276         struct list_head node;  /* list of bytecode runtime in event */
 277         struct lttng_event *event;
 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         struct lttng_event *event;
 290         loff_t offset;
 291         struct uprobe_consumer up_consumer;
 292         struct list_head node;
 293 };
 294
 295 /*
 296  * lttng_event structure is referred to by the tracing fast path. It must be
 297  * kept small.
 298  */
 299 struct lttng_event {
 300         enum lttng_event_type evtype;   /* First field. */
 301         unsigned int id;
 302         struct lttng_channel *chan;
 303         int enabled;
 304         const struct lttng_event_desc *desc;
 305         void *filter;
 306         struct lttng_ctx *ctx;
 307         enum lttng_kernel_instrumentation instrumentation;
 308         union {
 309                 struct {
 310                         struct kprobe kp;
 311                         char *symbol_name;
 312                 } kprobe;
 313                 struct {
 314                         struct lttng_krp *lttng_krp;
 315                         char *symbol_name;
 316                 } kretprobe;
 317                 struct {
 318                         char *symbol_name;
 319                 } ftrace;
 320                 struct {
 321                         struct inode *inode;
 322                         struct list_head head;
 323                 } uprobe;
 324         } u;
 325         struct list_head list;          /* Event list in session */
 326         unsigned int metadata_dumped:1;
 327
 328         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 329         struct list_head enablers_ref_head;
 330         struct hlist_node hlist;        /* session ht of events */
 331         int registered;                 /* has reg'd tracepoint probe */
 332         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 333         struct list_head bytecode_runtime_head;
 334         int has_enablers_without_bytecode;
 335 };
 336
 337 enum lttng_enabler_type {
 338         LTTNG_ENABLER_STAR_GLOB,
 339         LTTNG_ENABLER_NAME,
 340 };
 341
 342 /*
 343  * Enabler field, within whatever object is enabling an event. Target of
 344  * backward reference.
 345  */
 346 struct lttng_enabler {
 347         enum lttng_event_type evtype;   /* First field. */
 348
 349         enum lttng_enabler_type type;
 350
 351         struct list_head node;  /* per-session list of enablers */
 352         /* head list of struct lttng_ust_filter_bytecode_node */
 353         struct list_head filter_bytecode_head;
 354
 355         struct lttng_kernel_event event_param;
 356         struct lttng_channel *chan;
 357         struct lttng_ctx *ctx;
 358         unsigned int enabled:1;
 359 };
 360
 361 struct lttng_channel_ops {
 362         struct channel *(*channel_create)(const char *name,
 363                                 struct lttng_channel *lttng_chan,
 364                                 void *buf_addr,
 365                                 size_t subbuf_size, size_t num_subbuf,
 366                                 unsigned int switch_timer_interval,
 367                                 unsigned int read_timer_interval);
 368         void (*channel_destroy)(struct channel *chan);
 369         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 370         int (*buffer_has_read_closed_stream)(struct channel *chan);
 371         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 372         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 373                              uint32_t event_id);
 374         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 375         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 376                             size_t len);
 377         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 378                                       const void *src, size_t len);
 379         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 380                              int c, size_t len);
 381         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 382                              size_t len);
 383         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 384                                        const char __user *src, size_t len);
 385         /*
 386          * packet_avail_size returns the available size in the current
 387          * packet. Note that the size returned is only a hint, since it
 388          * may change due to concurrent writes.
 389          */
 390         size_t (*packet_avail_size)(struct channel *chan);
 391         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 392         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 393         int (*is_finalized)(struct channel *chan);
 394         int (*is_disabled)(struct channel *chan);
 395         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 396                         struct lib_ring_buffer *bufb,
 397                         uint64_t *timestamp_begin);
 398         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 399                         struct lib_ring_buffer *bufb,
 400                         uint64_t *timestamp_end);
 401         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 402                         struct lib_ring_buffer *bufb,
 403                         uint64_t *events_discarded);
 404         int (*content_size) (const struct lib_ring_buffer_config *config,
 405                         struct lib_ring_buffer *bufb,
 406                         uint64_t *content_size);
 407         int (*packet_size) (const struct lib_ring_buffer_config *config,
 408                         struct lib_ring_buffer *bufb,
 409                         uint64_t *packet_size);
 410         int (*stream_id) (const struct lib_ring_buffer_config *config,
 411                         struct lib_ring_buffer *bufb,
 412                         uint64_t *stream_id);
 413         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 414                         struct lib_ring_buffer *bufb,
 415                         uint64_t *ts);
 416         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 417                         struct lib_ring_buffer *bufb,
 418                         uint64_t *seq);
 419         int (*instance_id) (const struct lib_ring_buffer_config *config,
 420                         struct lib_ring_buffer *bufb,
 421                         uint64_t *id);
 422 };
 423
 424 struct lttng_transport {
 425         char *name;
 426         struct module *owner;
 427         struct list_head node;
 428         struct lttng_channel_ops ops;
 429 };
 430
 431 struct lttng_syscall_filter;
 432
 433 #define LTTNG_EVENT_HT_BITS             12
 434 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 435
 436 struct lttng_event_ht {
 437         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 438 };
 439
 440 struct lttng_channel {
 441         unsigned int id;
 442         struct channel *chan;           /* Channel buffers */
 443         int enabled;
 444         struct lttng_ctx *ctx;
 445         /* Event ID management */
 446         struct lttng_session *session;
 447         struct file *file;              /* File associated to channel */
 448         unsigned int free_event_id;     /* Next event ID to allocate */
 449         struct list_head list;          /* Channel list */
 450         struct lttng_channel_ops *ops;
 451         struct lttng_transport *transport;
 452         struct lttng_event **sc_table;  /* for syscall tracing */
 453         struct lttng_event **compat_sc_table;
 454         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 455         struct lttng_event **compat_sc_exit_table;
 456         struct lttng_event *sc_unknown; /* for unknown syscalls */
 457         struct lttng_event *sc_compat_unknown;
 458         struct lttng_event *sc_exit_unknown;
 459         struct lttng_event *compat_sc_exit_unknown;
 460         struct lttng_syscall_filter *sc_filter;
 461         int header_type;                /* 0: unset, 1: compact, 2: large */
 462         enum channel_type channel_type;
 463         unsigned int metadata_dumped:1,
 464                 sys_enter_registered:1,
 465                 sys_exit_registered:1,
 466                 syscall_all:1,
 467                 tstate:1;               /* Transient enable state */
 468 };
 469
 470 struct lttng_metadata_stream {
 471         void *priv;                     /* Ring buffer private data */
 472         struct lttng_metadata_cache *metadata_cache;
 473         unsigned int metadata_in;       /* Bytes read from the cache */
 474         unsigned int metadata_out;      /* Bytes consumed from stream */
 475         int finalized;                  /* Has channel been finalized */
 476         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 477         struct list_head list;          /* Stream list */
 478         struct lttng_transport *transport;
 479         uint64_t version;               /* Current version of the metadata cache */
 480 };
 481
 482 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 483
 484 struct lttng_dynamic_len_stack {
 485         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 486         size_t offset;
 487 };
 488
 489 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 490
 491 /*
 492  * struct lttng_pid_tracker declared in header due to deferencing of *v
 493  * in RCU_INITIALIZER(v).
 494  */
 495 #define LTTNG_PID_HASH_BITS     6
 496 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 497
 498 struct lttng_pid_tracker {
 499         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 500 };
 501
 502 struct lttng_pid_hash_node {
 503         struct hlist_node hlist;
 504         int pid;
 505 };
 506
 507 struct lttng_session {
 508         int active;                     /* Is trace session active ? */
 509         int been_active;                /* Has trace session been active ? */
 510         struct file *file;              /* File associated to session */
 511         struct list_head chan;          /* Channel list head */
 512         struct list_head events;        /* Event list head */
 513         struct list_head list;          /* Session list */
 514         unsigned int free_chan_id;      /* Next chan ID to allocate */
 515         uuid_le uuid;                   /* Trace session unique ID */
 516         struct lttng_metadata_cache *metadata_cache;
 517         struct lttng_pid_tracker *pid_tracker;
 518         unsigned int metadata_dumped:1,
 519                 tstate:1;               /* Transient enable state */
 520         /* List of enablers */
 521         struct list_head enablers_head;
 522         /* Hash table of events */
 523         struct lttng_event_ht events_ht;
 524 };
 525
 526 struct lttng_metadata_cache {
 527         char *data;                     /* Metadata cache */
 528         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 529         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 530         struct kref refcount;           /* Metadata cache usage */
 531         struct list_head metadata_stream;       /* Metadata stream list */
 532         uuid_le uuid;                   /* Trace session unique ID (copy) */
 533         struct mutex lock;              /* Produce/consume lock */
 534         uint64_t version;               /* Current version of the metadata */
 535 };
 536
 537 void lttng_lock_sessions(void);
 538 void lttng_unlock_sessions(void);
 539
 540 struct list_head *lttng_get_probe_list_head(void);
 541
 542 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 543                 struct lttng_kernel_event *event_param,
 544                 struct lttng_channel *chan);
 545
 546 int lttng_enabler_enable(struct lttng_enabler *enabler);
 547 int lttng_enabler_disable(struct lttng_enabler *enabler);
 548 int lttng_fix_pending_events(void);
 549 int lttng_session_active(void);
 550
 551 struct lttng_session *lttng_session_create(void);
 552 int lttng_session_enable(struct lttng_session *session);
 553 int lttng_session_disable(struct lttng_session *session);
 554 void lttng_session_destroy(struct lttng_session *session);
 555 int lttng_session_metadata_regenerate(struct lttng_session *session);
 556 int lttng_session_statedump(struct lttng_session *session);
 557 void metadata_cache_destroy(struct kref *kref);
 558
 559 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 560                                        const char *transport_name,
 561                                        void *buf_addr,
 562                                        size_t subbuf_size, size_t num_subbuf,
 563                                        unsigned int switch_timer_interval,
 564                                        unsigned int read_timer_interval,
 565                                        enum channel_type channel_type);
 566 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 567                                        int overwrite, void *buf_addr,
 568                                        size_t subbuf_size, size_t num_subbuf,
 569                                        unsigned int switch_timer_interval,
 570                                        unsigned int read_timer_interval);
 571
 572 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 573 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 574                                 struct lttng_kernel_event *event_param,
 575                                 void *filter,
 576                                 const struct lttng_event_desc *event_desc,
 577                                 enum lttng_kernel_instrumentation itype);
 578 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 579                                 struct lttng_kernel_event *event_param,
 580                                 void *filter,
 581                                 const struct lttng_event_desc *event_desc,
 582                                 enum lttng_kernel_instrumentation itype);
 583 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 584                 struct lttng_kernel_old_event *old_event_param,
 585                 void *filter,
 586                 const struct lttng_event_desc *internal_desc);
 587
 588 int lttng_channel_enable(struct lttng_channel *channel);
 589 int lttng_channel_disable(struct lttng_channel *channel);
 590 int lttng_event_enable(struct lttng_event *event);
 591 int lttng_event_disable(struct lttng_event *event);
 592
 593 void lttng_transport_register(struct lttng_transport *transport);
 594 void lttng_transport_unregister(struct lttng_transport *transport);
 595
 596 void synchronize_trace(void);
 597 int lttng_abi_init(void);
 598 int lttng_abi_compat_old_init(void);
 599 void lttng_abi_exit(void);
 600 void lttng_abi_compat_old_exit(void);
 601
 602 int lttng_probe_register(struct lttng_probe_desc *desc);
 603 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 604 const struct lttng_event_desc *lttng_event_get(const char *name);
 605 void lttng_event_put(const struct lttng_event_desc *desc);
 606 int lttng_probes_init(void);
 607 void lttng_probes_exit(void);
 608
 609 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 610                 struct channel *chan);
 611
 612 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 613 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 614 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 615 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 616 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 617 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 618
 619 int lttng_session_track_pid(struct lttng_session *session, int pid);
 620 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 621
 622 int lttng_session_list_tracker_pids(struct lttng_session *session);
 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_PERF_EVENTS)
 720 int lttng_add_perf_counter_to_ctx(uint32_t type,
 721                                   uint64_t config,
 722                                   const char *name,
 723                                   struct lttng_ctx **ctx);
 724 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 725                 struct lttng_cpuhp_node *node);
 726 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 727                 struct lttng_cpuhp_node *node);
 728 #else
 729 static inline
 730 int lttng_add_perf_counter_to_ctx(uint32_t type,
 731                                   uint64_t config,
 732                                   const char *name,
 733                                   struct lttng_ctx **ctx)
 734 {
 735         return -ENOSYS;
 736 }
 737 static inline
 738 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 739                 struct lttng_cpuhp_node *node)
 740 {
 741         return 0;
 742 }
 743 static inline
 744 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 745                 struct lttng_cpuhp_node *node)
 746 {
 747         return 0;
 748 }
 749 #endif
 750
 751 int lttng_logger_init(void);
 752 void lttng_logger_exit(void);
 753
 754 extern int lttng_statedump_start(struct lttng_session *session);
 755
 756 #ifdef CONFIG_KPROBES
 757 int lttng_kprobes_register(const char *name,
 758                 const char *symbol_name,
 759                 uint64_t offset,
 760                 uint64_t addr,
 761                 struct lttng_event *event);
 762 void lttng_kprobes_unregister(struct lttng_event *event);
 763 void lttng_kprobes_destroy_private(struct lttng_event *event);
 764 #else
 765 static inline
 766 int lttng_kprobes_register(const char *name,
 767                 const char *symbol_name,
 768                 uint64_t offset,
 769                 uint64_t addr,
 770                 struct lttng_event *event)
 771 {
 772         return -ENOSYS;
 773 }
 774
 775 static inline
 776 void lttng_kprobes_unregister(struct lttng_event *event)
 777 {
 778 }
 779
 780 static inline
 781 void lttng_kprobes_destroy_private(struct lttng_event *event)
 782 {
 783 }
 784 #endif
 785
 786 int lttng_event_add_callsite(struct lttng_event *event,
 787         struct lttng_kernel_event_callsite *callsite);
 788
 789 #ifdef CONFIG_UPROBES
 790 int lttng_uprobes_register(const char *name,
 791         int fd, struct lttng_event *event);
 792 int lttng_uprobes_add_callsite(struct lttng_event *event,
 793         struct lttng_kernel_event_callsite *callsite);
 794 void lttng_uprobes_unregister(struct lttng_event *event);
 795 void lttng_uprobes_destroy_private(struct lttng_event *event);
 796 #else
 797 static inline
 798 int lttng_uprobes_register(const char *name,
 799         int fd, struct lttng_event *event)
 800 {
 801         return -ENOSYS;
 802 }
 803
 804 static inline
 805 int lttng_uprobes_add_callsite(struct lttng_event *event,
 806         struct lttng_kernel_event_callsite *callsite)
 807 {
 808         return -ENOSYS;
 809 }
 810
 811 static inline
 812 void lttng_uprobes_unregister(struct lttng_event *event)
 813 {
 814 }
 815
 816 static inline
 817 void lttng_uprobes_destroy_private(struct lttng_event *event)
 818 {
 819 }
 820 #endif
 821
 822 #ifdef CONFIG_KRETPROBES
 823 int lttng_kretprobes_register(const char *name,
 824                 const char *symbol_name,
 825                 uint64_t offset,
 826                 uint64_t addr,
 827                 struct lttng_event *event_entry,
 828                 struct lttng_event *event_exit);
 829 void lttng_kretprobes_unregister(struct lttng_event *event);
 830 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 831 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 832         int enable);
 833 #else
 834 static inline
 835 int lttng_kretprobes_register(const char *name,
 836                 const char *symbol_name,
 837                 uint64_t offset,
 838                 uint64_t addr,
 839                 struct lttng_event *event_entry,
 840                 struct lttng_event *event_exit)
 841 {
 842         return -ENOSYS;
 843 }
 844
 845 static inline
 846 void lttng_kretprobes_unregister(struct lttng_event *event)
 847 {
 848 }
 849
 850 static inline
 851 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 852 {
 853 }
 854
 855 static inline
 856 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 857         int enable)
 858 {
 859         return -ENOSYS;
 860 }
 861 #endif
 862
 863 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
 864 int lttng_ftrace_register(const char *name,
 865                           const char *symbol_name,
 866                           struct lttng_event *event);
 867 void lttng_ftrace_unregister(struct lttng_event *event);
 868 void lttng_ftrace_destroy_private(struct lttng_event *event);
 869 #else
 870 static inline
 871 int lttng_ftrace_register(const char *name,
 872                           const char *symbol_name,
 873                           struct lttng_event *event)
 874 {
 875         return -ENOSYS;
 876 }
 877
 878 static inline
 879 void lttng_ftrace_unregister(struct lttng_event *event)
 880 {
 881 }
 882
 883 static inline
 884 void lttng_ftrace_destroy_private(struct lttng_event *event)
 885 {
 886 }
 887 #endif
 888
 889 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 890
 891 extern const struct file_operations lttng_tracepoint_list_fops;
 892 extern const struct file_operations lttng_syscall_list_fops;
 893
 894 #define TRACEPOINT_HAS_DATA_ARG
 895
 896 #endif /* _LTTNG_EVENTS_H */