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 <wrapper/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 /*
 289  * lttng_event structure is referred to by the tracing fast path. It must be
 290  * kept small.
 291  */
 292 struct lttng_event {
 293         enum lttng_event_type evtype;   /* First field. */
 294         unsigned int id;
 295         struct lttng_channel *chan;
 296         int enabled;
 297         const struct lttng_event_desc *desc;
 298         void *filter;
 299         struct lttng_ctx *ctx;
 300         enum lttng_kernel_instrumentation instrumentation;
 301         union {
 302                 struct {
 303                         struct kprobe kp;
 304                         char *symbol_name;
 305                 } kprobe;
 306                 struct {
 307                         struct lttng_krp *lttng_krp;
 308                         char *symbol_name;
 309                 } kretprobe;
 310                 struct {
 311                         char *symbol_name;
 312                 } ftrace;
 313                 struct {
 314                         struct uprobe_consumer up_consumer;
 315                         struct inode *inode;
 316                         loff_t offset;
 317                 } uprobe;
 318         } u;
 319         struct list_head list;          /* Event list in session */
 320         unsigned int metadata_dumped:1;
 321
 322         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 323         struct list_head enablers_ref_head;
 324         struct hlist_node hlist;        /* session ht of events */
 325         int registered;                 /* has reg'd tracepoint probe */
 326         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 327         struct list_head bytecode_runtime_head;
 328         int has_enablers_without_bytecode;
 329 };
 330
 331 enum lttng_enabler_type {
 332         LTTNG_ENABLER_STAR_GLOB,
 333         LTTNG_ENABLER_NAME,
 334 };
 335
 336 /*
 337  * Enabler field, within whatever object is enabling an event. Target of
 338  * backward reference.
 339  */
 340 struct lttng_enabler {
 341         enum lttng_event_type evtype;   /* First field. */
 342
 343         enum lttng_enabler_type type;
 344
 345         struct list_head node;  /* per-session list of enablers */
 346         /* head list of struct lttng_ust_filter_bytecode_node */
 347         struct list_head filter_bytecode_head;
 348
 349         struct lttng_kernel_event event_param;
 350         struct lttng_channel *chan;
 351         struct lttng_ctx *ctx;
 352         unsigned int enabled:1;
 353 };
 354
 355 struct lttng_channel_ops {
 356         struct channel *(*channel_create)(const char *name,
 357                                 struct lttng_channel *lttng_chan,
 358                                 void *buf_addr,
 359                                 size_t subbuf_size, size_t num_subbuf,
 360                                 unsigned int switch_timer_interval,
 361                                 unsigned int read_timer_interval);
 362         void (*channel_destroy)(struct channel *chan);
 363         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 364         int (*buffer_has_read_closed_stream)(struct channel *chan);
 365         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 366         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 367                              uint32_t event_id);
 368         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 369         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 370                             size_t len);
 371         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 372                                       const void *src, size_t len);
 373         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 374                              int c, size_t len);
 375         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 376                              size_t len);
 377         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 378                                        const char __user *src, size_t len);
 379         /*
 380          * packet_avail_size returns the available size in the current
 381          * packet. Note that the size returned is only a hint, since it
 382          * may change due to concurrent writes.
 383          */
 384         size_t (*packet_avail_size)(struct channel *chan);
 385         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 386         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 387         int (*is_finalized)(struct channel *chan);
 388         int (*is_disabled)(struct channel *chan);
 389         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 390                         struct lib_ring_buffer *bufb,
 391                         uint64_t *timestamp_begin);
 392         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 393                         struct lib_ring_buffer *bufb,
 394                         uint64_t *timestamp_end);
 395         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 396                         struct lib_ring_buffer *bufb,
 397                         uint64_t *events_discarded);
 398         int (*content_size) (const struct lib_ring_buffer_config *config,
 399                         struct lib_ring_buffer *bufb,
 400                         uint64_t *content_size);
 401         int (*packet_size) (const struct lib_ring_buffer_config *config,
 402                         struct lib_ring_buffer *bufb,
 403                         uint64_t *packet_size);
 404         int (*stream_id) (const struct lib_ring_buffer_config *config,
 405                         struct lib_ring_buffer *bufb,
 406                         uint64_t *stream_id);
 407         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 408                         struct lib_ring_buffer *bufb,
 409                         uint64_t *ts);
 410         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 411                         struct lib_ring_buffer *bufb,
 412                         uint64_t *seq);
 413         int (*instance_id) (const struct lib_ring_buffer_config *config,
 414                         struct lib_ring_buffer *bufb,
 415                         uint64_t *id);
 416 };
 417
 418 struct lttng_transport {
 419         char *name;
 420         struct module *owner;
 421         struct list_head node;
 422         struct lttng_channel_ops ops;
 423 };
 424
 425 struct lttng_syscall_filter;
 426
 427 #define LTTNG_EVENT_HT_BITS             12
 428 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 429
 430 struct lttng_event_ht {
 431         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 432 };
 433
 434 struct lttng_channel {
 435         unsigned int id;
 436         struct channel *chan;           /* Channel buffers */
 437         int enabled;
 438         struct lttng_ctx *ctx;
 439         /* Event ID management */
 440         struct lttng_session *session;
 441         struct file *file;              /* File associated to channel */
 442         unsigned int free_event_id;     /* Next event ID to allocate */
 443         struct list_head list;          /* Channel list */
 444         struct lttng_channel_ops *ops;
 445         struct lttng_transport *transport;
 446         struct lttng_event **sc_table;  /* for syscall tracing */
 447         struct lttng_event **compat_sc_table;
 448         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 449         struct lttng_event **compat_sc_exit_table;
 450         struct lttng_event *sc_unknown; /* for unknown syscalls */
 451         struct lttng_event *sc_compat_unknown;
 452         struct lttng_event *sc_exit_unknown;
 453         struct lttng_event *compat_sc_exit_unknown;
 454         struct lttng_syscall_filter *sc_filter;
 455         int header_type;                /* 0: unset, 1: compact, 2: large */
 456         enum channel_type channel_type;
 457         unsigned int metadata_dumped:1,
 458                 sys_enter_registered:1,
 459                 sys_exit_registered:1,
 460                 syscall_all:1,
 461                 tstate:1;               /* Transient enable state */
 462 };
 463
 464 struct lttng_metadata_stream {
 465         void *priv;                     /* Ring buffer private data */
 466         struct lttng_metadata_cache *metadata_cache;
 467         unsigned int metadata_in;       /* Bytes read from the cache */
 468         unsigned int metadata_out;      /* Bytes consumed from stream */
 469         int finalized;                  /* Has channel been finalized */
 470         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 471         struct list_head list;          /* Stream list */
 472         struct lttng_transport *transport;
 473         uint64_t version;               /* Current version of the metadata cache */
 474 };
 475
 476 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 477
 478 struct lttng_dynamic_len_stack {
 479         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 480         size_t offset;
 481 };
 482
 483 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 484
 485 /*
 486  * struct lttng_pid_tracker declared in header due to deferencing of *v
 487  * in RCU_INITIALIZER(v).
 488  */
 489 #define LTTNG_PID_HASH_BITS     6
 490 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 491
 492 struct lttng_pid_tracker {
 493         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 494 };
 495
 496 struct lttng_pid_hash_node {
 497         struct hlist_node hlist;
 498         int pid;
 499 };
 500
 501 struct lttng_session {
 502         int active;                     /* Is trace session active ? */
 503         int been_active;                /* Has trace session been active ? */
 504         struct file *file;              /* File associated to session */
 505         struct list_head chan;          /* Channel list head */
 506         struct list_head events;        /* Event list head */
 507         struct list_head list;          /* Session list */
 508         unsigned int free_chan_id;      /* Next chan ID to allocate */
 509         uuid_le uuid;                   /* Trace session unique ID */
 510         struct lttng_metadata_cache *metadata_cache;
 511         struct lttng_pid_tracker *pid_tracker;
 512         unsigned int metadata_dumped:1,
 513                 tstate:1;               /* Transient enable state */
 514         /* List of enablers */
 515         struct list_head enablers_head;
 516         /* Hash table of events */
 517         struct lttng_event_ht events_ht;
 518 };
 519
 520 struct lttng_metadata_cache {
 521         char *data;                     /* Metadata cache */
 522         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 523         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 524         struct kref refcount;           /* Metadata cache usage */
 525         struct list_head metadata_stream;       /* Metadata stream list */
 526         uuid_le uuid;                   /* Trace session unique ID (copy) */
 527         struct mutex lock;              /* Produce/consume lock */
 528         uint64_t version;               /* Current version of the metadata */
 529 };
 530
 531 void lttng_lock_sessions(void);
 532 void lttng_unlock_sessions(void);
 533
 534 struct list_head *lttng_get_probe_list_head(void);
 535
 536 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 537                 struct lttng_kernel_event *event_param,
 538                 struct lttng_channel *chan);
 539
 540 int lttng_enabler_enable(struct lttng_enabler *enabler);
 541 int lttng_enabler_disable(struct lttng_enabler *enabler);
 542 int lttng_fix_pending_events(void);
 543 int lttng_session_active(void);
 544
 545 struct lttng_session *lttng_session_create(void);
 546 int lttng_session_enable(struct lttng_session *session);
 547 int lttng_session_disable(struct lttng_session *session);
 548 void lttng_session_destroy(struct lttng_session *session);
 549 int lttng_session_metadata_regenerate(struct lttng_session *session);
 550 int lttng_session_statedump(struct lttng_session *session);
 551 void metadata_cache_destroy(struct kref *kref);
 552
 553 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 554                                        const char *transport_name,
 555                                        void *buf_addr,
 556                                        size_t subbuf_size, size_t num_subbuf,
 557                                        unsigned int switch_timer_interval,
 558                                        unsigned int read_timer_interval,
 559                                        enum channel_type channel_type);
 560 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 561                                        int overwrite, 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
 566 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 567 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 568                                 struct lttng_kernel_event *event_param,
 569                                 void *filter,
 570                                 const struct lttng_event_desc *event_desc,
 571                                 enum lttng_kernel_instrumentation itype);
 572 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 573                                 struct lttng_kernel_event *event_param,
 574                                 void *filter,
 575                                 const struct lttng_event_desc *event_desc,
 576                                 enum lttng_kernel_instrumentation itype);
 577 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 578                 struct lttng_kernel_old_event *old_event_param,
 579                 void *filter,
 580                 const struct lttng_event_desc *internal_desc);
 581
 582 int lttng_channel_enable(struct lttng_channel *channel);
 583 int lttng_channel_disable(struct lttng_channel *channel);
 584 int lttng_event_enable(struct lttng_event *event);
 585 int lttng_event_disable(struct lttng_event *event);
 586
 587 void lttng_transport_register(struct lttng_transport *transport);
 588 void lttng_transport_unregister(struct lttng_transport *transport);
 589
 590 void synchronize_trace(void);
 591 int lttng_abi_init(void);
 592 int lttng_abi_compat_old_init(void);
 593 void lttng_abi_exit(void);
 594 void lttng_abi_compat_old_exit(void);
 595
 596 int lttng_probe_register(struct lttng_probe_desc *desc);
 597 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 598 const struct lttng_event_desc *lttng_event_get(const char *name);
 599 void lttng_event_put(const struct lttng_event_desc *desc);
 600 int lttng_probes_init(void);
 601 void lttng_probes_exit(void);
 602
 603 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 604                 struct channel *chan);
 605
 606 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 607 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 608 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 609 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 610 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 611 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 612
 613 int lttng_session_track_pid(struct lttng_session *session, int pid);
 614 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 615
 616 int lttng_session_list_tracker_pids(struct lttng_session *session);
 617
 618 void lttng_clock_ref(void);
 619 void lttng_clock_unref(void);
 620
 621 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 622 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 623 int lttng_syscalls_unregister(struct lttng_channel *chan);
 624 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 625                 const char *name);
 626 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 627                 const char *name);
 628 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 629                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 630 #else
 631 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 632 {
 633         return -ENOSYS;
 634 }
 635
 636 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 637 {
 638         return 0;
 639 }
 640
 641 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 642                 const char *name)
 643 {
 644         return -ENOSYS;
 645 }
 646
 647 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 648                 const char *name)
 649 {
 650         return -ENOSYS;
 651 }
 652
 653 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 654                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 655 {
 656         return -ENOSYS;
 657 }
 658 #endif
 659
 660 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 661 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 662                 struct lttng_kernel_filter_bytecode __user *bytecode);
 663 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 664                 struct lttng_enabler *enabler);
 665
 666 int lttng_probes_init(void);
 667
 668 extern struct lttng_ctx *lttng_static_ctx;
 669
 670 int lttng_context_init(void);
 671 void lttng_context_exit(void);
 672 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 673 void lttng_context_update(struct lttng_ctx *ctx);
 674 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 675 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 676 void lttng_remove_context_field(struct lttng_ctx **ctx,
 677                                 struct lttng_ctx_field *field);
 678 void lttng_destroy_context(struct lttng_ctx *ctx);
 679 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 680 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 681 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 682 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 683 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 684 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 685 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 686 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 687 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 688 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 689 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 690 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 691 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 692 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 693 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 694 #else
 695 static inline
 696 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 697 {
 698         return -ENOSYS;
 699 }
 700 #endif
 701 #ifdef CONFIG_PREEMPT_RT_FULL
 702 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 703 #else
 704 static inline
 705 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 706 {
 707         return -ENOSYS;
 708 }
 709 #endif
 710
 711 int lttng_add_callstack_to_ctx(struct lttng_ctx **ctx, int type);
 712
 713 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 714 int lttng_add_perf_counter_to_ctx(uint32_t type,
 715                                   uint64_t config,
 716                                   const char *name,
 717                                   struct lttng_ctx **ctx);
 718 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 719                 struct lttng_cpuhp_node *node);
 720 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 721                 struct lttng_cpuhp_node *node);
 722 #else
 723 static inline
 724 int lttng_add_perf_counter_to_ctx(uint32_t type,
 725                                   uint64_t config,
 726                                   const char *name,
 727                                   struct lttng_ctx **ctx)
 728 {
 729         return -ENOSYS;
 730 }
 731 static inline
 732 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
 733                 struct lttng_cpuhp_node *node)
 734 {
 735         return 0;
 736 }
 737 static inline
 738 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
 739                 struct lttng_cpuhp_node *node)
 740 {
 741         return 0;
 742 }
 743 #endif
 744
 745 int lttng_logger_init(void);
 746 void lttng_logger_exit(void);
 747
 748 extern int lttng_statedump_start(struct lttng_session *session);
 749
 750 #ifdef CONFIG_KPROBES
 751 int lttng_kprobes_register(const char *name,
 752                 const char *symbol_name,
 753                 uint64_t offset,
 754                 uint64_t addr,
 755                 struct lttng_event *event);
 756 void lttng_kprobes_unregister(struct lttng_event *event);
 757 void lttng_kprobes_destroy_private(struct lttng_event *event);
 758 #else
 759 static inline
 760 int lttng_kprobes_register(const char *name,
 761                 const char *symbol_name,
 762                 uint64_t offset,
 763                 uint64_t addr,
 764                 struct lttng_event *event)
 765 {
 766         return -ENOSYS;
 767 }
 768
 769 static inline
 770 void lttng_kprobes_unregister(struct lttng_event *event)
 771 {
 772 }
 773
 774 static inline
 775 void lttng_kprobes_destroy_private(struct lttng_event *event)
 776 {
 777 }
 778 #endif
 779
 780 #ifdef CONFIG_UPROBES
 781 int lttng_uprobes_register(const char *name,
 782                 int fd,
 783                 uint64_t offset,
 784                 struct lttng_event *event);
 785 void lttng_uprobes_unregister(struct lttng_event *event);
 786 void lttng_uprobes_destroy_private(struct lttng_event *event);
 787 #else
 788 static inline
 789 int lttng_uprobes_register(const char *name,
 790                 int fd,
 791                 uint64_t offset,
 792                 struct lttng_event *event)
 793 {
 794         return -ENOSYS;
 795 }
 796
 797 static inline
 798 void lttng_uprobes_unregister(struct lttng_event *event)
 799 {
 800 }
 801
 802 static inline
 803 void lttng_uprobes_destroy_private(struct lttng_event *event)
 804 {
 805 }
 806 #endif
 807
 808 #ifdef CONFIG_KRETPROBES
 809 int lttng_kretprobes_register(const char *name,
 810                 const char *symbol_name,
 811                 uint64_t offset,
 812                 uint64_t addr,
 813                 struct lttng_event *event_entry,
 814                 struct lttng_event *event_exit);
 815 void lttng_kretprobes_unregister(struct lttng_event *event);
 816 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 817 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 818         int enable);
 819 #else
 820 static inline
 821 int lttng_kretprobes_register(const char *name,
 822                 const char *symbol_name,
 823                 uint64_t offset,
 824                 uint64_t addr,
 825                 struct lttng_event *event_entry,
 826                 struct lttng_event *event_exit)
 827 {
 828         return -ENOSYS;
 829 }
 830
 831 static inline
 832 void lttng_kretprobes_unregister(struct lttng_event *event)
 833 {
 834 }
 835
 836 static inline
 837 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 838 {
 839 }
 840
 841 static inline
 842 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 843         int enable)
 844 {
 845         return -ENOSYS;
 846 }
 847 #endif
 848
 849 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
 850 int lttng_ftrace_register(const char *name,
 851                           const char *symbol_name,
 852                           struct lttng_event *event);
 853 void lttng_ftrace_unregister(struct lttng_event *event);
 854 void lttng_ftrace_destroy_private(struct lttng_event *event);
 855 #else
 856 static inline
 857 int lttng_ftrace_register(const char *name,
 858                           const char *symbol_name,
 859                           struct lttng_event *event)
 860 {
 861         return -ENOSYS;
 862 }
 863
 864 static inline
 865 void lttng_ftrace_unregister(struct lttng_event *event)
 866 {
 867 }
 868
 869 static inline
 870 void lttng_ftrace_destroy_private(struct lttng_event *event)
 871 {
 872 }
 873 #endif
 874
 875 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 876
 877 extern const struct file_operations lttng_tracepoint_list_fops;
 878 extern const struct file_operations lttng_syscall_list_fops;
 879
 880 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 881 #define TRACEPOINT_HAS_DATA_ARG
 882 #endif
 883
 884 #endif /* _LTTNG_EVENTS_H */