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 };
 142
 143 union lttng_ctx_value {
 144         int64_t s64;
 145         const char *str;
 146         double d;
 147 };
 148
 149 /*
 150  * We need to keep this perf counter field separately from struct
 151  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 152  */
 153 struct lttng_perf_counter_field {
 154         struct notifier_block nb;
 155         int hp_enable;
 156         struct perf_event_attr *attr;
 157         struct perf_event **e;  /* per-cpu array */
 158 };
 159
 160 struct lttng_ctx_field {
 161         struct lttng_event_field event_field;
 162         size_t (*get_size)(size_t offset);
 163         void (*record)(struct lttng_ctx_field *field,
 164                        struct lib_ring_buffer_ctx *ctx,
 165                        struct lttng_channel *chan);
 166         void (*get_value)(struct lttng_ctx_field *field,
 167                          union lttng_ctx_value *value);
 168         union {
 169                 struct lttng_perf_counter_field *perf_counter;
 170         } u;
 171         void (*destroy)(struct lttng_ctx_field *field);
 172 };
 173
 174 struct lttng_ctx {
 175         struct lttng_ctx_field *fields;
 176         unsigned int nr_fields;
 177         unsigned int allocated_fields;
 178         size_t largest_align;   /* in bytes */
 179 };
 180
 181 struct lttng_event_desc {
 182         const char *name;               /* lttng-modules name */
 183         const char *kname;              /* Linux kernel name (tracepoints) */
 184         void *probe_callback;
 185         const struct lttng_event_ctx *ctx;      /* context */
 186         const struct lttng_event_field *fields; /* event payload */
 187         unsigned int nr_fields;
 188         struct module *owner;
 189 };
 190
 191 struct lttng_probe_desc {
 192         const char *provider;
 193         const struct lttng_event_desc **event_desc;
 194         unsigned int nr_events;
 195         struct list_head head;                  /* chain registered probes */
 196         struct list_head lazy_init_head;
 197         int lazy;                               /* lazy registration */
 198 };
 199
 200 struct lttng_krp;                               /* Kretprobe handling */
 201
 202 enum lttng_event_type {
 203         LTTNG_TYPE_EVENT = 0,
 204         LTTNG_TYPE_ENABLER = 1,
 205 };
 206
 207 struct lttng_filter_bytecode_node {
 208         struct list_head node;
 209         struct lttng_enabler *enabler;
 210         /*
 211          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 212          * last field.
 213          */
 214         struct lttng_kernel_filter_bytecode bc;
 215 };
 216
 217 /*
 218  * Filter return value masks.
 219  */
 220 enum lttng_filter_ret {
 221         LTTNG_FILTER_DISCARD = 0,
 222         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 223         /* Other bits are kept for future use. */
 224 };
 225
 226 struct lttng_bytecode_runtime {
 227         /* Associated bytecode */
 228         struct lttng_filter_bytecode_node *bc;
 229         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 230         int link_failed;
 231         struct list_head node;  /* list of bytecode runtime in event */
 232 };
 233
 234 /*
 235  * Objects in a linked-list of enablers, owned by an event.
 236  */
 237 struct lttng_enabler_ref {
 238         struct list_head node;                  /* enabler ref list */
 239         struct lttng_enabler *ref;              /* backward ref */
 240 };
 241
 242 /*
 243  * lttng_event structure is referred to by the tracing fast path. It must be
 244  * kept small.
 245  */
 246 struct lttng_event {
 247         enum lttng_event_type evtype;   /* First field. */
 248         unsigned int id;
 249         struct lttng_channel *chan;
 250         int enabled;
 251         const struct lttng_event_desc *desc;
 252         void *filter;
 253         struct lttng_ctx *ctx;
 254         enum lttng_kernel_instrumentation instrumentation;
 255         union {
 256                 struct {
 257                         struct kprobe kp;
 258                         char *symbol_name;
 259                 } kprobe;
 260                 struct {
 261                         struct lttng_krp *lttng_krp;
 262                         char *symbol_name;
 263                 } kretprobe;
 264                 struct {
 265                         char *symbol_name;
 266                 } ftrace;
 267         } u;
 268         struct list_head list;          /* Event list in session */
 269         unsigned int metadata_dumped:1;
 270
 271         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 272         struct list_head enablers_ref_head;
 273         struct hlist_node hlist;        /* session ht of events */
 274         int registered;                 /* has reg'd tracepoint probe */
 275         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 276         struct list_head bytecode_runtime_head;
 277         int has_enablers_without_bytecode;
 278 };
 279
 280 enum lttng_enabler_type {
 281         LTTNG_ENABLER_WILDCARD,
 282         LTTNG_ENABLER_NAME,
 283 };
 284
 285 /*
 286  * Enabler field, within whatever object is enabling an event. Target of
 287  * backward reference.
 288  */
 289 struct lttng_enabler {
 290         enum lttng_event_type evtype;   /* First field. */
 291
 292         enum lttng_enabler_type type;
 293
 294         struct list_head node;  /* per-session list of enablers */
 295         /* head list of struct lttng_ust_filter_bytecode_node */
 296         struct list_head filter_bytecode_head;
 297
 298         struct lttng_kernel_event event_param;
 299         struct lttng_channel *chan;
 300         struct lttng_ctx *ctx;
 301         unsigned int enabled:1;
 302 };
 303
 304 struct lttng_channel_ops {
 305         struct channel *(*channel_create)(const char *name,
 306                                 struct lttng_channel *lttng_chan,
 307                                 void *buf_addr,
 308                                 size_t subbuf_size, size_t num_subbuf,
 309                                 unsigned int switch_timer_interval,
 310                                 unsigned int read_timer_interval);
 311         void (*channel_destroy)(struct channel *chan);
 312         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 313         int (*buffer_has_read_closed_stream)(struct channel *chan);
 314         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 315         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 316                              uint32_t event_id);
 317         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 318         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 319                             size_t len);
 320         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 321                                       const void *src, size_t len);
 322         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 323                              int c, size_t len);
 324         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 325                              size_t len);
 326         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 327                                        const char __user *src, size_t len);
 328         /*
 329          * packet_avail_size returns the available size in the current
 330          * packet. Note that the size returned is only a hint, since it
 331          * may change due to concurrent writes.
 332          */
 333         size_t (*packet_avail_size)(struct channel *chan);
 334         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 335         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 336         int (*is_finalized)(struct channel *chan);
 337         int (*is_disabled)(struct channel *chan);
 338         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 339                         struct lib_ring_buffer *bufb,
 340                         uint64_t *timestamp_begin);
 341         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 342                         struct lib_ring_buffer *bufb,
 343                         uint64_t *timestamp_end);
 344         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 345                         struct lib_ring_buffer *bufb,
 346                         uint64_t *events_discarded);
 347         int (*content_size) (const struct lib_ring_buffer_config *config,
 348                         struct lib_ring_buffer *bufb,
 349                         uint64_t *content_size);
 350         int (*packet_size) (const struct lib_ring_buffer_config *config,
 351                         struct lib_ring_buffer *bufb,
 352                         uint64_t *packet_size);
 353         int (*stream_id) (const struct lib_ring_buffer_config *config,
 354                         struct lib_ring_buffer *bufb,
 355                         uint64_t *stream_id);
 356         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 357                         struct lib_ring_buffer *bufb,
 358                         uint64_t *ts);
 359 };
 360
 361 struct lttng_transport {
 362         char *name;
 363         struct module *owner;
 364         struct list_head node;
 365         struct lttng_channel_ops ops;
 366 };
 367
 368 struct lttng_syscall_filter;
 369
 370 #define LTTNG_EVENT_HT_BITS             12
 371 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 372
 373 struct lttng_event_ht {
 374         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 375 };
 376
 377 struct lttng_channel {
 378         unsigned int id;
 379         struct channel *chan;           /* Channel buffers */
 380         int enabled;
 381         struct lttng_ctx *ctx;
 382         /* Event ID management */
 383         struct lttng_session *session;
 384         struct file *file;              /* File associated to channel */
 385         unsigned int free_event_id;     /* Next event ID to allocate */
 386         struct list_head list;          /* Channel list */
 387         struct lttng_channel_ops *ops;
 388         struct lttng_transport *transport;
 389         struct lttng_event **sc_table;  /* for syscall tracing */
 390         struct lttng_event **compat_sc_table;
 391         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 392         struct lttng_event **compat_sc_exit_table;
 393         struct lttng_event *sc_unknown; /* for unknown syscalls */
 394         struct lttng_event *sc_compat_unknown;
 395         struct lttng_event *sc_exit_unknown;
 396         struct lttng_event *compat_sc_exit_unknown;
 397         struct lttng_syscall_filter *sc_filter;
 398         int header_type;                /* 0: unset, 1: compact, 2: large */
 399         enum channel_type channel_type;
 400         unsigned int metadata_dumped:1,
 401                 sys_enter_registered:1,
 402                 sys_exit_registered:1,
 403                 syscall_all:1,
 404                 tstate:1;               /* Transient enable state */
 405 };
 406
 407 struct lttng_metadata_stream {
 408         void *priv;                     /* Ring buffer private data */
 409         struct lttng_metadata_cache *metadata_cache;
 410         unsigned int metadata_in;       /* Bytes read from the cache */
 411         unsigned int metadata_out;      /* Bytes consumed from stream */
 412         int finalized;                  /* Has channel been finalized */
 413         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 414         struct list_head list;          /* Stream list */
 415         struct lttng_transport *transport;
 416         struct mutex lock;
 417 };
 418
 419
 420 /*
 421  * struct lttng_pid_tracker declared in header due to deferencing of *v
 422  * in RCU_INITIALIZER(v).
 423  */
 424 #define LTTNG_PID_HASH_BITS     6
 425 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 426
 427 struct lttng_pid_tracker {
 428         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 429 };
 430
 431 struct lttng_pid_hash_node {
 432         struct hlist_node hlist;
 433         int pid;
 434 };
 435
 436 struct lttng_session {
 437         int active;                     /* Is trace session active ? */
 438         int been_active;                /* Has trace session been active ? */
 439         struct file *file;              /* File associated to session */
 440         struct list_head chan;          /* Channel list head */
 441         struct list_head events;        /* Event list head */
 442         struct list_head list;          /* Session list */
 443         unsigned int free_chan_id;      /* Next chan ID to allocate */
 444         uuid_le uuid;                   /* Trace session unique ID */
 445         struct lttng_metadata_cache *metadata_cache;
 446         struct lttng_pid_tracker *pid_tracker;
 447         unsigned int metadata_dumped:1,
 448                 tstate:1;               /* Transient enable state */
 449         /* List of enablers */
 450         struct list_head enablers_head;
 451         /* Hash table of events */
 452         struct lttng_event_ht events_ht;
 453 };
 454
 455 struct lttng_metadata_cache {
 456         char *data;                     /* Metadata cache */
 457         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 458         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 459         struct kref refcount;           /* Metadata cache usage */
 460         struct list_head metadata_stream;       /* Metadata stream list */
 461         uuid_le uuid;                   /* Trace session unique ID (copy) */
 462 };
 463
 464 void lttng_lock_sessions(void);
 465 void lttng_unlock_sessions(void);
 466
 467 struct list_head *lttng_get_probe_list_head(void);
 468
 469 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 470                 struct lttng_kernel_event *event_param,
 471                 struct lttng_channel *chan);
 472
 473 int lttng_enabler_enable(struct lttng_enabler *enabler);
 474 int lttng_enabler_disable(struct lttng_enabler *enabler);
 475 int lttng_fix_pending_events(void);
 476 int lttng_session_active(void);
 477
 478 struct lttng_session *lttng_session_create(void);
 479 int lttng_session_enable(struct lttng_session *session);
 480 int lttng_session_disable(struct lttng_session *session);
 481 void lttng_session_destroy(struct lttng_session *session);
 482 void metadata_cache_destroy(struct kref *kref);
 483
 484 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 485                                        const char *transport_name,
 486                                        void *buf_addr,
 487                                        size_t subbuf_size, size_t num_subbuf,
 488                                        unsigned int switch_timer_interval,
 489                                        unsigned int read_timer_interval,
 490                                        enum channel_type channel_type);
 491 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 492                                        int overwrite, void *buf_addr,
 493                                        size_t subbuf_size, size_t num_subbuf,
 494                                        unsigned int switch_timer_interval,
 495                                        unsigned int read_timer_interval);
 496
 497 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 498 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 499                                 struct lttng_kernel_event *event_param,
 500                                 void *filter,
 501                                 const struct lttng_event_desc *event_desc,
 502                                 enum lttng_kernel_instrumentation itype);
 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_compat_old_create(struct lttng_channel *chan,
 509                 struct lttng_kernel_old_event *old_event_param,
 510                 void *filter,
 511                 const struct lttng_event_desc *internal_desc);
 512
 513 int lttng_channel_enable(struct lttng_channel *channel);
 514 int lttng_channel_disable(struct lttng_channel *channel);
 515 int lttng_event_enable(struct lttng_event *event);
 516 int lttng_event_disable(struct lttng_event *event);
 517
 518 void lttng_transport_register(struct lttng_transport *transport);
 519 void lttng_transport_unregister(struct lttng_transport *transport);
 520
 521 void synchronize_trace(void);
 522 int lttng_abi_init(void);
 523 int lttng_abi_compat_old_init(void);
 524 void lttng_abi_exit(void);
 525 void lttng_abi_compat_old_exit(void);
 526
 527 int lttng_probe_register(struct lttng_probe_desc *desc);
 528 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 529 const struct lttng_event_desc *lttng_event_get(const char *name);
 530 void lttng_event_put(const struct lttng_event_desc *desc);
 531 int lttng_probes_init(void);
 532 void lttng_probes_exit(void);
 533
 534 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 535                 struct channel *chan);
 536
 537 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 538 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 539 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 540 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 541 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 542 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 543
 544 int lttng_session_track_pid(struct lttng_session *session, int pid);
 545 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 546
 547 int lttng_session_list_tracker_pids(struct lttng_session *session);
 548
 549 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 550 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 551 int lttng_syscalls_unregister(struct lttng_channel *chan);
 552 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 553                 const char *name);
 554 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 555                 const char *name);
 556 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 557                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 558 int lttng_abi_syscall_list(void);
 559 #else
 560 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 561 {
 562         return -ENOSYS;
 563 }
 564
 565 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 566 {
 567         return 0;
 568 }
 569
 570 static inline
 571 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 572                 const char *name)
 573 {
 574         return -ENOSYS;
 575 }
 576
 577 static inline
 578 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 579                 const char *name)
 580 {
 581         return -ENOSYS;
 582 }
 583
 584 static inline
 585 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 586                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 587 {
 588         return -ENOSYS;
 589 }
 590
 591 static inline
 592 int lttng_abi_syscall_list(void)
 593 {
 594         return -ENOSYS;
 595 }
 596 #endif
 597
 598 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 599 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 600                 struct lttng_kernel_filter_bytecode __user *bytecode);
 601
 602 extern struct lttng_ctx *lttng_static_ctx;
 603
 604 int lttng_context_init(void);
 605 void lttng_context_exit(void);
 606 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 607 void lttng_context_update(struct lttng_ctx *ctx);
 608 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 609 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 610 void lttng_remove_context_field(struct lttng_ctx **ctx,
 611                                 struct lttng_ctx_field *field);
 612 void lttng_destroy_context(struct lttng_ctx *ctx);
 613 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 614 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 615 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 616 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 617 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 618 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 619 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 620 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 621 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 622 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 623 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 624 int lttng_add_perf_counter_to_ctx(uint32_t type,
 625                                   uint64_t config,
 626                                   const char *name,
 627                                   struct lttng_ctx **ctx);
 628 #else
 629 static inline
 630 int lttng_add_perf_counter_to_ctx(uint32_t type,
 631                                   uint64_t config,
 632                                   const char *name,
 633                                   struct lttng_ctx **ctx)
 634 {
 635         return -ENOSYS;
 636 }
 637 #endif
 638
 639 int lttng_logger_init(void);
 640 void lttng_logger_exit(void);
 641
 642 extern int lttng_statedump_start(struct lttng_session *session);
 643
 644 #ifdef CONFIG_KPROBES
 645 int lttng_kprobes_register(const char *name,
 646                 const char *symbol_name,
 647                 uint64_t offset,
 648                 uint64_t addr,
 649                 struct lttng_event *event);
 650 void lttng_kprobes_unregister(struct lttng_event *event);
 651 void lttng_kprobes_destroy_private(struct lttng_event *event);
 652 #else
 653 static inline
 654 int lttng_kprobes_register(const char *name,
 655                 const char *symbol_name,
 656                 uint64_t offset,
 657                 uint64_t addr,
 658                 struct lttng_event *event)
 659 {
 660         return -ENOSYS;
 661 }
 662
 663 static inline
 664 void lttng_kprobes_unregister(struct lttng_event *event)
 665 {
 666 }
 667
 668 static inline
 669 void lttng_kprobes_destroy_private(struct lttng_event *event)
 670 {
 671 }
 672 #endif
 673
 674 #ifdef CONFIG_KRETPROBES
 675 int lttng_kretprobes_register(const char *name,
 676                 const char *symbol_name,
 677                 uint64_t offset,
 678                 uint64_t addr,
 679                 struct lttng_event *event_entry,
 680                 struct lttng_event *event_exit);
 681 void lttng_kretprobes_unregister(struct lttng_event *event);
 682 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 683 #else
 684 static inline
 685 int lttng_kretprobes_register(const char *name,
 686                 const char *symbol_name,
 687                 uint64_t offset,
 688                 uint64_t addr,
 689                 struct lttng_event *event_entry,
 690                 struct lttng_event *event_exit)
 691 {
 692         return -ENOSYS;
 693 }
 694
 695 static inline
 696 void lttng_kretprobes_unregister(struct lttng_event *event)
 697 {
 698 }
 699
 700 static inline
 701 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 702 {
 703 }
 704 #endif
 705
 706 #ifdef CONFIG_DYNAMIC_FTRACE
 707 int lttng_ftrace_register(const char *name,
 708                           const char *symbol_name,
 709                           struct lttng_event *event);
 710 void lttng_ftrace_unregister(struct lttng_event *event);
 711 void lttng_ftrace_destroy_private(struct lttng_event *event);
 712 #else
 713 static inline
 714 int lttng_ftrace_register(const char *name,
 715                           const char *symbol_name,
 716                           struct lttng_event *event)
 717 {
 718         return -ENOSYS;
 719 }
 720
 721 static inline
 722 void lttng_ftrace_unregister(struct lttng_event *event)
 723 {
 724 }
 725
 726 static inline
 727 void lttng_ftrace_destroy_private(struct lttng_event *event)
 728 {
 729 }
 730 #endif
 731
 732 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 733
 734 extern const struct file_operations lttng_tracepoint_list_fops;
 735 extern const struct file_operations lttng_syscall_list_fops;
 736
 737 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 738 #define TRACEPOINT_HAS_DATA_ARG
 739 #endif
 740
 741 #endif /* _LTTNG_EVENTS_H */