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