lttng-events.h

   1 #ifndef _LTTNG_EVENTS_H
   2 #define _LTTNG_EVENTS_H
   3
   4 /*
   5  * lttng-events.h
   6  *
   7  * Holds LTTng per-session event registry.
   8  *
   9  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/version.h>
  27 #include <linux/list.h>
  28 #include <linux/kprobes.h>
  29 #include <linux/kref.h>
  30 #include "wrapper/uuid.h"
  31 #include "lttng-abi.h"
  32 #include "lttng-abi-old.h"
  33
  34 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  35
  36 struct lttng_channel;
  37 struct lttng_session;
  38 struct lttng_metadata_cache;
  39 struct lib_ring_buffer_ctx;
  40 struct perf_event;
  41 struct perf_event_attr;
  42 struct lib_ring_buffer_config;
  43
  44 /* Type description */
  45
  46 /* Update the astract_types name table in lttng-types.c along with this enum */
  47 enum abstract_types {
  48         atype_integer,
  49         atype_enum,
  50         atype_array,
  51         atype_sequence,
  52         atype_string,
  53         NR_ABSTRACT_TYPES,
  54 };
  55
  56 /* Update the string_encodings name table in lttng-types.c along with this enum */
  57 enum lttng_string_encodings {
  58         lttng_encode_none = 0,
  59         lttng_encode_UTF8 = 1,
  60         lttng_encode_ASCII = 2,
  61         NR_STRING_ENCODINGS,
  62 };
  63
  64 enum channel_type {
  65         PER_CPU_CHANNEL,
  66         METADATA_CHANNEL,
  67 };
  68
  69 struct lttng_enum_entry {
  70         unsigned long long start, end;  /* start and end are inclusive */
  71         const char *string;
  72 };
  73
  74 #define __type_integer(_type, _byte_order, _base, _encoding)    \
  75         {                                                       \
  76             .atype = atype_integer,                             \
  77             .u.basic.integer =                                  \
  78                 {                                               \
  79                   .size = sizeof(_type) * CHAR_BIT,             \
  80                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
  81                   .signedness = lttng_is_signed_type(_type),    \
  82                   .reverse_byte_order = _byte_order != __BYTE_ORDER,    \
  83                   .base = _base,                                \
  84                   .encoding = lttng_encode_##_encoding,         \
  85                 },                                              \
  86         }                                                       \
  87
  88 struct lttng_integer_type {
  89         unsigned int size;              /* in bits */
  90         unsigned short alignment;       /* in bits */
  91         unsigned int signedness:1,
  92                 reverse_byte_order:1;
  93         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  94         enum lttng_string_encodings encoding;
  95 };
  96
  97 union _lttng_basic_type {
  98         struct lttng_integer_type integer;
  99         struct {
 100                 const char *name;
 101         } enumeration;
 102         struct {
 103                 enum lttng_string_encodings encoding;
 104         } string;
 105 };
 106
 107 struct lttng_basic_type {
 108         enum abstract_types atype;
 109         union {
 110                 union _lttng_basic_type basic;
 111         } u;
 112 };
 113
 114 struct lttng_type {
 115         enum abstract_types atype;
 116         union {
 117                 union _lttng_basic_type basic;
 118                 struct {
 119                         struct lttng_basic_type elem_type;
 120                         unsigned int length;            /* num. elems. */
 121                 } array;
 122                 struct {
 123                         struct lttng_basic_type length_type;
 124                         struct lttng_basic_type elem_type;
 125                 } sequence;
 126         } u;
 127 };
 128
 129 struct lttng_enum {
 130         const char *name;
 131         struct lttng_type container_type;
 132         const struct lttng_enum_entry *entries;
 133         unsigned int len;
 134 };
 135
 136 /* Event field description */
 137
 138 struct lttng_event_field {
 139         const char *name;
 140         struct lttng_type type;
 141         unsigned int nowrite:1,         /* do not write into trace */
 142                         user:1;         /* fetch from user-space */
 143 };
 144
 145 union lttng_ctx_value {
 146         int64_t s64;
 147         const char *str;
 148         double d;
 149 };
 150
 151 /*
 152  * We need to keep this perf counter field separately from struct
 153  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 154  */
 155 struct lttng_perf_counter_field {
 156         struct notifier_block nb;
 157         int hp_enable;
 158         struct perf_event_attr *attr;
 159         struct perf_event **e;  /* per-cpu array */
 160 };
 161
 162 struct lttng_ctx_field {
 163         struct lttng_event_field event_field;
 164         size_t (*get_size)(size_t offset);
 165         void (*record)(struct lttng_ctx_field *field,
 166                        struct lib_ring_buffer_ctx *ctx,
 167                        struct lttng_channel *chan);
 168         void (*get_value)(struct lttng_ctx_field *field,
 169                          union lttng_ctx_value *value);
 170         union {
 171                 struct lttng_perf_counter_field *perf_counter;
 172         } u;
 173         void (*destroy)(struct lttng_ctx_field *field);
 174 };
 175
 176 struct lttng_ctx {
 177         struct lttng_ctx_field *fields;
 178         unsigned int nr_fields;
 179         unsigned int allocated_fields;
 180         size_t largest_align;   /* in bytes */
 181 };
 182
 183 struct lttng_event_desc {
 184         const char *name;               /* lttng-modules name */
 185         const char *kname;              /* Linux kernel name (tracepoints) */
 186         void *probe_callback;
 187         const struct lttng_event_ctx *ctx;      /* context */
 188         const struct lttng_event_field *fields; /* event payload */
 189         unsigned int nr_fields;
 190         struct module *owner;
 191 };
 192
 193 struct lttng_probe_desc {
 194         const char *provider;
 195         const struct lttng_event_desc **event_desc;
 196         unsigned int nr_events;
 197         struct list_head head;                  /* chain registered probes */
 198         struct list_head lazy_init_head;
 199         int lazy;                               /* lazy registration */
 200 };
 201
 202 struct lttng_krp;                               /* Kretprobe handling */
 203
 204 enum lttng_event_type {
 205         LTTNG_TYPE_EVENT = 0,
 206         LTTNG_TYPE_ENABLER = 1,
 207 };
 208
 209 struct lttng_filter_bytecode_node {
 210         struct list_head node;
 211         struct lttng_enabler *enabler;
 212         /*
 213          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 214          * last field.
 215          */
 216         struct lttng_kernel_filter_bytecode bc;
 217 };
 218
 219 /*
 220  * Filter return value masks.
 221  */
 222 enum lttng_filter_ret {
 223         LTTNG_FILTER_DISCARD = 0,
 224         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 225         /* Other bits are kept for future use. */
 226 };
 227
 228 struct lttng_bytecode_runtime {
 229         /* Associated bytecode */
 230         struct lttng_filter_bytecode_node *bc;
 231         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 232         int link_failed;
 233         struct list_head node;  /* list of bytecode runtime in event */
 234 };
 235
 236 /*
 237  * Objects in a linked-list of enablers, owned by an event.
 238  */
 239 struct lttng_enabler_ref {
 240         struct list_head node;                  /* enabler ref list */
 241         struct lttng_enabler *ref;              /* backward ref */
 242 };
 243
 244 /*
 245  * lttng_event structure is referred to by the tracing fast path. It must be
 246  * kept small.
 247  */
 248 struct lttng_event {
 249         enum lttng_event_type evtype;   /* First field. */
 250         unsigned int id;
 251         struct lttng_channel *chan;
 252         int enabled;
 253         const struct lttng_event_desc *desc;
 254         void *filter;
 255         struct lttng_ctx *ctx;
 256         enum lttng_kernel_instrumentation instrumentation;
 257         union {
 258                 struct {
 259                         struct kprobe kp;
 260                         char *symbol_name;
 261                 } kprobe;
 262                 struct {
 263                         struct lttng_krp *lttng_krp;
 264                         char *symbol_name;
 265                 } kretprobe;
 266                 struct {
 267                         char *symbol_name;
 268                 } ftrace;
 269         } u;
 270         struct list_head list;          /* Event list in session */
 271         unsigned int metadata_dumped:1;
 272
 273         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 274         struct list_head enablers_ref_head;
 275         struct hlist_node hlist;        /* session ht of events */
 276         int registered;                 /* has reg'd tracepoint probe */
 277         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 278         struct list_head bytecode_runtime_head;
 279         int has_enablers_without_bytecode;
 280 };
 281
 282 enum lttng_enabler_type {
 283         LTTNG_ENABLER_WILDCARD,
 284         LTTNG_ENABLER_NAME,
 285 };
 286
 287 /*
 288  * Enabler field, within whatever object is enabling an event. Target of
 289  * backward reference.
 290  */
 291 struct lttng_enabler {
 292         enum lttng_event_type evtype;   /* First field. */
 293
 294         enum lttng_enabler_type type;
 295
 296         struct list_head node;  /* per-session list of enablers */
 297         /* head list of struct lttng_ust_filter_bytecode_node */
 298         struct list_head filter_bytecode_head;
 299
 300         struct lttng_kernel_event event_param;
 301         struct lttng_channel *chan;
 302         struct lttng_ctx *ctx;
 303         unsigned int enabled:1;
 304 };
 305
 306 struct lttng_channel_ops {
 307         struct channel *(*channel_create)(const char *name,
 308                                 struct lttng_channel *lttng_chan,
 309                                 void *buf_addr,
 310                                 size_t subbuf_size, size_t num_subbuf,
 311                                 unsigned int switch_timer_interval,
 312                                 unsigned int read_timer_interval);
 313         void (*channel_destroy)(struct channel *chan);
 314         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 315         int (*buffer_has_read_closed_stream)(struct channel *chan);
 316         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 317         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 318                              uint32_t event_id);
 319         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 320         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 321                             size_t len);
 322         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 323                                       const void *src, size_t len);
 324         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 325                              int c, size_t len);
 326         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 327                              size_t len);
 328         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 329                                        const char __user *src, size_t len);
 330         /*
 331          * packet_avail_size returns the available size in the current
 332          * packet. Note that the size returned is only a hint, since it
 333          * may change due to concurrent writes.
 334          */
 335         size_t (*packet_avail_size)(struct channel *chan);
 336         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 337         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 338         int (*is_finalized)(struct channel *chan);
 339         int (*is_disabled)(struct channel *chan);
 340         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 341                         struct lib_ring_buffer *bufb,
 342                         uint64_t *timestamp_begin);
 343         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 344                         struct lib_ring_buffer *bufb,
 345                         uint64_t *timestamp_end);
 346         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 347                         struct lib_ring_buffer *bufb,
 348                         uint64_t *events_discarded);
 349         int (*content_size) (const struct lib_ring_buffer_config *config,
 350                         struct lib_ring_buffer *bufb,
 351                         uint64_t *content_size);
 352         int (*packet_size) (const struct lib_ring_buffer_config *config,
 353                         struct lib_ring_buffer *bufb,
 354                         uint64_t *packet_size);
 355         int (*stream_id) (const struct lib_ring_buffer_config *config,
 356                         struct lib_ring_buffer *bufb,
 357                         uint64_t *stream_id);
 358         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 359                         struct lib_ring_buffer *bufb,
 360                         uint64_t *ts);
 361         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 362                         struct lib_ring_buffer *bufb,
 363                         uint64_t *seq);
 364 };
 365
 366 struct lttng_transport {
 367         char *name;
 368         struct module *owner;
 369         struct list_head node;
 370         struct lttng_channel_ops ops;
 371 };
 372
 373 struct lttng_syscall_filter;
 374
 375 #define LTTNG_EVENT_HT_BITS             12
 376 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 377
 378 struct lttng_event_ht {
 379         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 380 };
 381
 382 struct lttng_channel {
 383         unsigned int id;
 384         struct channel *chan;           /* Channel buffers */
 385         int enabled;
 386         struct lttng_ctx *ctx;
 387         /* Event ID management */
 388         struct lttng_session *session;
 389         struct file *file;              /* File associated to channel */
 390         unsigned int free_event_id;     /* Next event ID to allocate */
 391         struct list_head list;          /* Channel list */
 392         struct lttng_channel_ops *ops;
 393         struct lttng_transport *transport;
 394         struct lttng_event **sc_table;  /* for syscall tracing */
 395         struct lttng_event **compat_sc_table;
 396         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 397         struct lttng_event **compat_sc_exit_table;
 398         struct lttng_event *sc_unknown; /* for unknown syscalls */
 399         struct lttng_event *sc_compat_unknown;
 400         struct lttng_event *sc_exit_unknown;
 401         struct lttng_event *compat_sc_exit_unknown;
 402         struct lttng_syscall_filter *sc_filter;
 403         int header_type;                /* 0: unset, 1: compact, 2: large */
 404         enum channel_type channel_type;
 405         unsigned int metadata_dumped:1,
 406                 sys_enter_registered:1,
 407                 sys_exit_registered:1,
 408                 syscall_all:1,
 409                 tstate:1;               /* Transient enable state */
 410 };
 411
 412 struct lttng_metadata_stream {
 413         void *priv;                     /* Ring buffer private data */
 414         struct lttng_metadata_cache *metadata_cache;
 415         unsigned int metadata_in;       /* Bytes read from the cache */
 416         unsigned int metadata_out;      /* Bytes consumed from stream */
 417         int finalized;                  /* Has channel been finalized */
 418         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 419         struct list_head list;          /* Stream list */
 420         struct lttng_transport *transport;
 421 };
 422
 423
 424 /*
 425  * struct lttng_pid_tracker declared in header due to deferencing of *v
 426  * in RCU_INITIALIZER(v).
 427  */
 428 #define LTTNG_PID_HASH_BITS     6
 429 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 430
 431 struct lttng_pid_tracker {
 432         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 433 };
 434
 435 struct lttng_pid_hash_node {
 436         struct hlist_node hlist;
 437         int pid;
 438 };
 439
 440 struct lttng_session {
 441         int active;                     /* Is trace session active ? */
 442         int been_active;                /* Has trace session been active ? */
 443         struct file *file;              /* File associated to session */
 444         struct list_head chan;          /* Channel list head */
 445         struct list_head events;        /* Event list head */
 446         struct list_head list;          /* Session list */
 447         unsigned int free_chan_id;      /* Next chan ID to allocate */
 448         uuid_le uuid;                   /* Trace session unique ID */
 449         struct lttng_metadata_cache *metadata_cache;
 450         struct lttng_pid_tracker *pid_tracker;
 451         unsigned int metadata_dumped:1,
 452                 tstate:1;               /* Transient enable state */
 453         /* List of enablers */
 454         struct list_head enablers_head;
 455         /* Hash table of events */
 456         struct lttng_event_ht events_ht;
 457 };
 458
 459 struct lttng_metadata_cache {
 460         char *data;                     /* Metadata cache */
 461         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 462         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 463         struct kref refcount;           /* Metadata cache usage */
 464         struct list_head metadata_stream;       /* Metadata stream list */
 465         uuid_le uuid;                   /* Trace session unique ID (copy) */
 466         struct mutex lock;
 467 };
 468
 469 void lttng_lock_sessions(void);
 470 void lttng_unlock_sessions(void);
 471
 472 struct list_head *lttng_get_probe_list_head(void);
 473
 474 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 475                 struct lttng_kernel_event *event_param,
 476                 struct lttng_channel *chan);
 477
 478 int lttng_enabler_enable(struct lttng_enabler *enabler);
 479 int lttng_enabler_disable(struct lttng_enabler *enabler);
 480 int lttng_fix_pending_events(void);
 481 int lttng_session_active(void);
 482
 483 struct lttng_session *lttng_session_create(void);
 484 int lttng_session_enable(struct lttng_session *session);
 485 int lttng_session_disable(struct lttng_session *session);
 486 void lttng_session_destroy(struct lttng_session *session);
 487 void metadata_cache_destroy(struct kref *kref);
 488
 489 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 490                                        const char *transport_name,
 491                                        void *buf_addr,
 492                                        size_t subbuf_size, size_t num_subbuf,
 493                                        unsigned int switch_timer_interval,
 494                                        unsigned int read_timer_interval,
 495                                        enum channel_type channel_type);
 496 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 497                                        int overwrite, void *buf_addr,
 498                                        size_t subbuf_size, size_t num_subbuf,
 499                                        unsigned int switch_timer_interval,
 500                                        unsigned int read_timer_interval);
 501
 502 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 503 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 504                                 struct lttng_kernel_event *event_param,
 505                                 void *filter,
 506                                 const struct lttng_event_desc *event_desc,
 507                                 enum lttng_kernel_instrumentation itype);
 508 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 509                                 struct lttng_kernel_event *event_param,
 510                                 void *filter,
 511                                 const struct lttng_event_desc *event_desc,
 512                                 enum lttng_kernel_instrumentation itype);
 513 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 514                 struct lttng_kernel_old_event *old_event_param,
 515                 void *filter,
 516                 const struct lttng_event_desc *internal_desc);
 517
 518 int lttng_channel_enable(struct lttng_channel *channel);
 519 int lttng_channel_disable(struct lttng_channel *channel);
 520 int lttng_event_enable(struct lttng_event *event);
 521 int lttng_event_disable(struct lttng_event *event);
 522
 523 void lttng_transport_register(struct lttng_transport *transport);
 524 void lttng_transport_unregister(struct lttng_transport *transport);
 525
 526 void synchronize_trace(void);
 527 int lttng_abi_init(void);
 528 int lttng_abi_compat_old_init(void);
 529 void lttng_abi_exit(void);
 530 void lttng_abi_compat_old_exit(void);
 531
 532 int lttng_probe_register(struct lttng_probe_desc *desc);
 533 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 534 const struct lttng_event_desc *lttng_event_get(const char *name);
 535 void lttng_event_put(const struct lttng_event_desc *desc);
 536 int lttng_probes_init(void);
 537 void lttng_probes_exit(void);
 538
 539 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 540                 struct channel *chan);
 541
 542 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 543 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 544 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 545 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 546 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 547 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 548
 549 int lttng_session_track_pid(struct lttng_session *session, int pid);
 550 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 551
 552 int lttng_session_list_tracker_pids(struct lttng_session *session);
 553
 554 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 555 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 556 int lttng_syscalls_unregister(struct lttng_channel *chan);
 557 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 558                 const char *name);
 559 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 560                 const char *name);
 561 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 562                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 563 #else
 564 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 565 {
 566         return -ENOSYS;
 567 }
 568
 569 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 570 {
 571         return 0;
 572 }
 573
 574 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 575                 const char *name)
 576 {
 577         return -ENOSYS;
 578 }
 579
 580 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 581                 const char *name)
 582 {
 583         return -ENOSYS;
 584 }
 585
 586 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 587                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 588 {
 589         return -ENOSYS;
 590 }
 591 #endif
 592
 593 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 594 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 595                 struct lttng_kernel_filter_bytecode __user *bytecode);
 596 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 597                 struct lttng_enabler *enabler);
 598
 599 extern struct lttng_ctx *lttng_static_ctx;
 600
 601 int lttng_context_init(void);
 602 void lttng_context_exit(void);
 603 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 604 void lttng_context_update(struct lttng_ctx *ctx);
 605 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 606 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 607 void lttng_remove_context_field(struct lttng_ctx **ctx,
 608                                 struct lttng_ctx_field *field);
 609 void lttng_destroy_context(struct lttng_ctx *ctx);
 610 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 611 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 612 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 613 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 614 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 615 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 616 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 617 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 618 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 619 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 620 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 621 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 622 int lttng_add_perf_counter_to_ctx(uint32_t type,
 623                                   uint64_t config,
 624                                   const char *name,
 625                                   struct lttng_ctx **ctx);
 626 #else
 627 static inline
 628 int lttng_add_perf_counter_to_ctx(uint32_t type,
 629                                   uint64_t config,
 630                                   const char *name,
 631                                   struct lttng_ctx **ctx)
 632 {
 633         return -ENOSYS;
 634 }
 635 #endif
 636
 637 int lttng_logger_init(void);
 638 void lttng_logger_exit(void);
 639
 640 extern int lttng_statedump_start(struct lttng_session *session);
 641
 642 #ifdef CONFIG_KPROBES
 643 int lttng_kprobes_register(const char *name,
 644                 const char *symbol_name,
 645                 uint64_t offset,
 646                 uint64_t addr,
 647                 struct lttng_event *event);
 648 void lttng_kprobes_unregister(struct lttng_event *event);
 649 void lttng_kprobes_destroy_private(struct lttng_event *event);
 650 #else
 651 static inline
 652 int lttng_kprobes_register(const char *name,
 653                 const char *symbol_name,
 654                 uint64_t offset,
 655                 uint64_t addr,
 656                 struct lttng_event *event)
 657 {
 658         return -ENOSYS;
 659 }
 660
 661 static inline
 662 void lttng_kprobes_unregister(struct lttng_event *event)
 663 {
 664 }
 665
 666 static inline
 667 void lttng_kprobes_destroy_private(struct lttng_event *event)
 668 {
 669 }
 670 #endif
 671
 672 #ifdef CONFIG_KRETPROBES
 673 int lttng_kretprobes_register(const char *name,
 674                 const char *symbol_name,
 675                 uint64_t offset,
 676                 uint64_t addr,
 677                 struct lttng_event *event_entry,
 678                 struct lttng_event *event_exit);
 679 void lttng_kretprobes_unregister(struct lttng_event *event);
 680 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 681 #else
 682 static inline
 683 int lttng_kretprobes_register(const char *name,
 684                 const char *symbol_name,
 685                 uint64_t offset,
 686                 uint64_t addr,
 687                 struct lttng_event *event_entry,
 688                 struct lttng_event *event_exit)
 689 {
 690         return -ENOSYS;
 691 }
 692
 693 static inline
 694 void lttng_kretprobes_unregister(struct lttng_event *event)
 695 {
 696 }
 697
 698 static inline
 699 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 700 {
 701 }
 702 #endif
 703
 704 #ifdef CONFIG_DYNAMIC_FTRACE
 705 int lttng_ftrace_register(const char *name,
 706                           const char *symbol_name,
 707                           struct lttng_event *event);
 708 void lttng_ftrace_unregister(struct lttng_event *event);
 709 void lttng_ftrace_destroy_private(struct lttng_event *event);
 710 #else
 711 static inline
 712 int lttng_ftrace_register(const char *name,
 713                           const char *symbol_name,
 714                           struct lttng_event *event)
 715 {
 716         return -ENOSYS;
 717 }
 718
 719 static inline
 720 void lttng_ftrace_unregister(struct lttng_event *event)
 721 {
 722 }
 723
 724 static inline
 725 void lttng_ftrace_destroy_private(struct lttng_event *event)
 726 {
 727 }
 728 #endif
 729
 730 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 731
 732 extern const struct file_operations lttng_tracepoint_list_fops;
 733 extern const struct file_operations lttng_syscall_list_fops;
 734
 735 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 736 #define TRACEPOINT_HAS_DATA_ARG
 737 #endif
 738
 739 #endif /* _LTTNG_EVENTS_H */