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, _size, _alignment, _signedness,   \
  75                 _byte_order, _base, _encoding)  \
  76         {                                                       \
  77             .atype = atype_integer,                             \
  78             .u.basic.integer =                                  \
  79                 {                                               \
  80                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  81                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  82                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  83                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  84                   .base = _base,                                \
  85                   .encoding = lttng_encode_##_encoding,         \
  86                 },                                              \
  87         }                                                       \
  88
  89 struct lttng_integer_type {
  90         unsigned int size;              /* in bits */
  91         unsigned short alignment;       /* in bits */
  92         unsigned int signedness:1,
  93                 reverse_byte_order:1;
  94         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  95         enum lttng_string_encodings encoding;
  96 };
  97
  98 union _lttng_basic_type {
  99         struct lttng_integer_type integer;
 100         struct {
 101                 const char *name;
 102         } enumeration;
 103         struct {
 104                 enum lttng_string_encodings encoding;
 105         } string;
 106 };
 107
 108 struct lttng_basic_type {
 109         enum abstract_types atype;
 110         union {
 111                 union _lttng_basic_type basic;
 112         } u;
 113 };
 114
 115 struct lttng_type {
 116         enum abstract_types atype;
 117         union {
 118                 union _lttng_basic_type basic;
 119                 struct {
 120                         struct lttng_basic_type elem_type;
 121                         unsigned int length;            /* num. elems. */
 122                         unsigned int elem_alignment;    /* alignment override */
 123                 } array;
 124                 struct {
 125                         struct lttng_basic_type length_type;
 126                         struct lttng_basic_type elem_type;
 127                         unsigned int elem_alignment;    /* alignment override */
 128                 } sequence;
 129         } u;
 130 };
 131
 132 struct lttng_enum {
 133         const char *name;
 134         struct lttng_type container_type;
 135         const struct lttng_enum_entry *entries;
 136         unsigned int len;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_event_field {
 142         const char *name;
 143         struct lttng_type type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1;         /* fetch from user-space */
 146 };
 147
 148 union lttng_ctx_value {
 149         int64_t s64;
 150         const char *str;
 151         double d;
 152 };
 153
 154 /*
 155  * We need to keep this perf counter field separately from struct
 156  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 157  */
 158 struct lttng_perf_counter_field {
 159         struct notifier_block nb;
 160         int hp_enable;
 161         struct perf_event_attr *attr;
 162         struct perf_event **e;  /* per-cpu array */
 163 };
 164
 165 struct lttng_ctx_field {
 166         struct lttng_event_field event_field;
 167         size_t (*get_size)(size_t offset);
 168         void (*record)(struct lttng_ctx_field *field,
 169                        struct lib_ring_buffer_ctx *ctx,
 170                        struct lttng_channel *chan);
 171         void (*get_value)(struct lttng_ctx_field *field,
 172                          union lttng_ctx_value *value);
 173         union {
 174                 struct lttng_perf_counter_field *perf_counter;
 175         } u;
 176         void (*destroy)(struct lttng_ctx_field *field);
 177 };
 178
 179 struct lttng_ctx {
 180         struct lttng_ctx_field *fields;
 181         unsigned int nr_fields;
 182         unsigned int allocated_fields;
 183         size_t largest_align;   /* in bytes */
 184 };
 185
 186 struct lttng_event_desc {
 187         const char *name;               /* lttng-modules name */
 188         const char *kname;              /* Linux kernel name (tracepoints) */
 189         void *probe_callback;
 190         const struct lttng_event_ctx *ctx;      /* context */
 191         const struct lttng_event_field *fields; /* event payload */
 192         unsigned int nr_fields;
 193         struct module *owner;
 194 };
 195
 196 struct lttng_probe_desc {
 197         const char *provider;
 198         const struct lttng_event_desc **event_desc;
 199         unsigned int nr_events;
 200         struct list_head head;                  /* chain registered probes */
 201         struct list_head lazy_init_head;
 202         int lazy;                               /* lazy registration */
 203 };
 204
 205 struct lttng_krp;                               /* Kretprobe handling */
 206
 207 enum lttng_event_type {
 208         LTTNG_TYPE_EVENT = 0,
 209         LTTNG_TYPE_ENABLER = 1,
 210 };
 211
 212 struct lttng_filter_bytecode_node {
 213         struct list_head node;
 214         struct lttng_enabler *enabler;
 215         /*
 216          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 217          * last field.
 218          */
 219         struct lttng_kernel_filter_bytecode bc;
 220 };
 221
 222 /*
 223  * Filter return value masks.
 224  */
 225 enum lttng_filter_ret {
 226         LTTNG_FILTER_DISCARD = 0,
 227         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 228         /* Other bits are kept for future use. */
 229 };
 230
 231 struct lttng_bytecode_runtime {
 232         /* Associated bytecode */
 233         struct lttng_filter_bytecode_node *bc;
 234         uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
 235         int link_failed;
 236         struct list_head node;  /* list of bytecode runtime in event */
 237 };
 238
 239 /*
 240  * Objects in a linked-list of enablers, owned by an event.
 241  */
 242 struct lttng_enabler_ref {
 243         struct list_head node;                  /* enabler ref list */
 244         struct lttng_enabler *ref;              /* backward ref */
 245 };
 246
 247 /*
 248  * lttng_event structure is referred to by the tracing fast path. It must be
 249  * kept small.
 250  */
 251 struct lttng_event {
 252         enum lttng_event_type evtype;   /* First field. */
 253         unsigned int id;
 254         struct lttng_channel *chan;
 255         int enabled;
 256         const struct lttng_event_desc *desc;
 257         void *filter;
 258         struct lttng_ctx *ctx;
 259         enum lttng_kernel_instrumentation instrumentation;
 260         union {
 261                 struct {
 262                         struct kprobe kp;
 263                         char *symbol_name;
 264                 } kprobe;
 265                 struct {
 266                         struct lttng_krp *lttng_krp;
 267                         char *symbol_name;
 268                 } kretprobe;
 269                 struct {
 270                         char *symbol_name;
 271                 } ftrace;
 272         } u;
 273         struct list_head list;          /* Event list in session */
 274         unsigned int metadata_dumped:1;
 275
 276         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 277         struct list_head enablers_ref_head;
 278         struct hlist_node hlist;        /* session ht of events */
 279         int registered;                 /* has reg'd tracepoint probe */
 280         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 281         struct list_head bytecode_runtime_head;
 282         int has_enablers_without_bytecode;
 283 };
 284
 285 enum lttng_enabler_type {
 286         LTTNG_ENABLER_WILDCARD,
 287         LTTNG_ENABLER_NAME,
 288 };
 289
 290 /*
 291  * Enabler field, within whatever object is enabling an event. Target of
 292  * backward reference.
 293  */
 294 struct lttng_enabler {
 295         enum lttng_event_type evtype;   /* First field. */
 296
 297         enum lttng_enabler_type type;
 298
 299         struct list_head node;  /* per-session list of enablers */
 300         /* head list of struct lttng_ust_filter_bytecode_node */
 301         struct list_head filter_bytecode_head;
 302
 303         struct lttng_kernel_event event_param;
 304         struct lttng_channel *chan;
 305         struct lttng_ctx *ctx;
 306         unsigned int enabled:1;
 307 };
 308
 309 struct lttng_channel_ops {
 310         struct channel *(*channel_create)(const char *name,
 311                                 struct lttng_channel *lttng_chan,
 312                                 void *buf_addr,
 313                                 size_t subbuf_size, size_t num_subbuf,
 314                                 unsigned int switch_timer_interval,
 315                                 unsigned int read_timer_interval);
 316         void (*channel_destroy)(struct channel *chan);
 317         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 318         int (*buffer_has_read_closed_stream)(struct channel *chan);
 319         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 320         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 321                              uint32_t event_id);
 322         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 323         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 324                             size_t len);
 325         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 326                                       const void *src, size_t len);
 327         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 328                              int c, size_t len);
 329         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 330                              size_t len);
 331         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 332                                        const char __user *src, size_t len);
 333         /*
 334          * packet_avail_size returns the available size in the current
 335          * packet. Note that the size returned is only a hint, since it
 336          * may change due to concurrent writes.
 337          */
 338         size_t (*packet_avail_size)(struct channel *chan);
 339         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 340         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 341         int (*is_finalized)(struct channel *chan);
 342         int (*is_disabled)(struct channel *chan);
 343         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 344                         struct lib_ring_buffer *bufb,
 345                         uint64_t *timestamp_begin);
 346         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 347                         struct lib_ring_buffer *bufb,
 348                         uint64_t *timestamp_end);
 349         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 350                         struct lib_ring_buffer *bufb,
 351                         uint64_t *events_discarded);
 352         int (*content_size) (const struct lib_ring_buffer_config *config,
 353                         struct lib_ring_buffer *bufb,
 354                         uint64_t *content_size);
 355         int (*packet_size) (const struct lib_ring_buffer_config *config,
 356                         struct lib_ring_buffer *bufb,
 357                         uint64_t *packet_size);
 358         int (*stream_id) (const struct lib_ring_buffer_config *config,
 359                         struct lib_ring_buffer *bufb,
 360                         uint64_t *stream_id);
 361         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 362                         struct lib_ring_buffer *bufb,
 363                         uint64_t *ts);
 364         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 365                         struct lib_ring_buffer *bufb,
 366                         uint64_t *seq);
 367         int (*instance_id) (const struct lib_ring_buffer_config *config,
 368                         struct lib_ring_buffer *bufb,
 369                         uint64_t *id);
 370 };
 371
 372 struct lttng_transport {
 373         char *name;
 374         struct module *owner;
 375         struct list_head node;
 376         struct lttng_channel_ops ops;
 377 };
 378
 379 struct lttng_syscall_filter;
 380
 381 #define LTTNG_EVENT_HT_BITS             12
 382 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 383
 384 struct lttng_event_ht {
 385         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 386 };
 387
 388 struct lttng_channel {
 389         unsigned int id;
 390         struct channel *chan;           /* Channel buffers */
 391         int enabled;
 392         struct lttng_ctx *ctx;
 393         /* Event ID management */
 394         struct lttng_session *session;
 395         struct file *file;              /* File associated to channel */
 396         unsigned int free_event_id;     /* Next event ID to allocate */
 397         struct list_head list;          /* Channel list */
 398         struct lttng_channel_ops *ops;
 399         struct lttng_transport *transport;
 400         struct lttng_event **sc_table;  /* for syscall tracing */
 401         struct lttng_event **compat_sc_table;
 402         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 403         struct lttng_event **compat_sc_exit_table;
 404         struct lttng_event *sc_unknown; /* for unknown syscalls */
 405         struct lttng_event *sc_compat_unknown;
 406         struct lttng_event *sc_exit_unknown;
 407         struct lttng_event *compat_sc_exit_unknown;
 408         struct lttng_syscall_filter *sc_filter;
 409         int header_type;                /* 0: unset, 1: compact, 2: large */
 410         enum channel_type channel_type;
 411         unsigned int metadata_dumped:1,
 412                 sys_enter_registered:1,
 413                 sys_exit_registered:1,
 414                 syscall_all:1,
 415                 tstate:1;               /* Transient enable state */
 416 };
 417
 418 struct lttng_metadata_stream {
 419         void *priv;                     /* Ring buffer private data */
 420         struct lttng_metadata_cache *metadata_cache;
 421         unsigned int metadata_in;       /* Bytes read from the cache */
 422         unsigned int metadata_out;      /* Bytes consumed from stream */
 423         int finalized;                  /* Has channel been finalized */
 424         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 425         struct list_head list;          /* Stream list */
 426         struct lttng_transport *transport;
 427         uint64_t version;               /* Current version of the metadata cache */
 428 };
 429
 430
 431 /*
 432  * struct lttng_pid_tracker declared in header due to deferencing of *v
 433  * in RCU_INITIALIZER(v).
 434  */
 435 #define LTTNG_PID_HASH_BITS     6
 436 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 437
 438 struct lttng_pid_tracker {
 439         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 440 };
 441
 442 struct lttng_pid_hash_node {
 443         struct hlist_node hlist;
 444         int pid;
 445 };
 446
 447 struct lttng_session {
 448         int active;                     /* Is trace session active ? */
 449         int been_active;                /* Has trace session been active ? */
 450         struct file *file;              /* File associated to session */
 451         struct list_head chan;          /* Channel list head */
 452         struct list_head events;        /* Event list head */
 453         struct list_head list;          /* Session list */
 454         unsigned int free_chan_id;      /* Next chan ID to allocate */
 455         uuid_le uuid;                   /* Trace session unique ID */
 456         struct lttng_metadata_cache *metadata_cache;
 457         struct lttng_pid_tracker *pid_tracker;
 458         unsigned int metadata_dumped:1,
 459                 tstate:1;               /* Transient enable state */
 460         /* List of enablers */
 461         struct list_head enablers_head;
 462         /* Hash table of events */
 463         struct lttng_event_ht events_ht;
 464 };
 465
 466 struct lttng_metadata_cache {
 467         char *data;                     /* Metadata cache */
 468         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 469         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 470         struct kref refcount;           /* Metadata cache usage */
 471         struct list_head metadata_stream;       /* Metadata stream list */
 472         uuid_le uuid;                   /* Trace session unique ID (copy) */
 473         struct mutex lock;              /* Produce/consume lock */
 474         uint64_t version;               /* Current version of the metadata */
 475 };
 476
 477 void lttng_lock_sessions(void);
 478 void lttng_unlock_sessions(void);
 479
 480 struct list_head *lttng_get_probe_list_head(void);
 481
 482 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 483                 struct lttng_kernel_event *event_param,
 484                 struct lttng_channel *chan);
 485
 486 int lttng_enabler_enable(struct lttng_enabler *enabler);
 487 int lttng_enabler_disable(struct lttng_enabler *enabler);
 488 int lttng_fix_pending_events(void);
 489 int lttng_session_active(void);
 490
 491 struct lttng_session *lttng_session_create(void);
 492 int lttng_session_enable(struct lttng_session *session);
 493 int lttng_session_disable(struct lttng_session *session);
 494 void lttng_session_destroy(struct lttng_session *session);
 495 int lttng_session_metadata_regenerate(struct lttng_session *session);
 496 void metadata_cache_destroy(struct kref *kref);
 497
 498 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 499                                        const char *transport_name,
 500                                        void *buf_addr,
 501                                        size_t subbuf_size, size_t num_subbuf,
 502                                        unsigned int switch_timer_interval,
 503                                        unsigned int read_timer_interval,
 504                                        enum channel_type channel_type);
 505 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 506                                        int overwrite, void *buf_addr,
 507                                        size_t subbuf_size, size_t num_subbuf,
 508                                        unsigned int switch_timer_interval,
 509                                        unsigned int read_timer_interval);
 510
 511 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 512 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 513                                 struct lttng_kernel_event *event_param,
 514                                 void *filter,
 515                                 const struct lttng_event_desc *event_desc,
 516                                 enum lttng_kernel_instrumentation itype);
 517 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 518                                 struct lttng_kernel_event *event_param,
 519                                 void *filter,
 520                                 const struct lttng_event_desc *event_desc,
 521                                 enum lttng_kernel_instrumentation itype);
 522 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 523                 struct lttng_kernel_old_event *old_event_param,
 524                 void *filter,
 525                 const struct lttng_event_desc *internal_desc);
 526
 527 int lttng_channel_enable(struct lttng_channel *channel);
 528 int lttng_channel_disable(struct lttng_channel *channel);
 529 int lttng_event_enable(struct lttng_event *event);
 530 int lttng_event_disable(struct lttng_event *event);
 531
 532 void lttng_transport_register(struct lttng_transport *transport);
 533 void lttng_transport_unregister(struct lttng_transport *transport);
 534
 535 void synchronize_trace(void);
 536 int lttng_abi_init(void);
 537 int lttng_abi_compat_old_init(void);
 538 void lttng_abi_exit(void);
 539 void lttng_abi_compat_old_exit(void);
 540
 541 int lttng_probe_register(struct lttng_probe_desc *desc);
 542 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 543 const struct lttng_event_desc *lttng_event_get(const char *name);
 544 void lttng_event_put(const struct lttng_event_desc *desc);
 545 int lttng_probes_init(void);
 546 void lttng_probes_exit(void);
 547
 548 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 549                 struct channel *chan);
 550
 551 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 552 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 553 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 554 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 555 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 556 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 557
 558 int lttng_session_track_pid(struct lttng_session *session, int pid);
 559 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 560
 561 int lttng_session_list_tracker_pids(struct lttng_session *session);
 562
 563 void lttng_clock_ref(void);
 564 void lttng_clock_unref(void);
 565
 566 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 567 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 568 int lttng_syscalls_unregister(struct lttng_channel *chan);
 569 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 570                 const char *name);
 571 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 572                 const char *name);
 573 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 574                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 575 #else
 576 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 577 {
 578         return -ENOSYS;
 579 }
 580
 581 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 582 {
 583         return 0;
 584 }
 585
 586 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 587                 const char *name)
 588 {
 589         return -ENOSYS;
 590 }
 591
 592 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 593                 const char *name)
 594 {
 595         return -ENOSYS;
 596 }
 597
 598 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 599                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 600 {
 601         return -ENOSYS;
 602 }
 603 #endif
 604
 605 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 606 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 607                 struct lttng_kernel_filter_bytecode __user *bytecode);
 608 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 609                 struct lttng_enabler *enabler);
 610
 611 extern struct lttng_ctx *lttng_static_ctx;
 612
 613 int lttng_context_init(void);
 614 void lttng_context_exit(void);
 615 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 616 void lttng_context_update(struct lttng_ctx *ctx);
 617 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 618 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 619 void lttng_remove_context_field(struct lttng_ctx **ctx,
 620                                 struct lttng_ctx_field *field);
 621 void lttng_destroy_context(struct lttng_ctx *ctx);
 622 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 623 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 624 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 625 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 626 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 627 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 628 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 629 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 630 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 631 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 632 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 633 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 634 int lttng_add_perf_counter_to_ctx(uint32_t type,
 635                                   uint64_t config,
 636                                   const char *name,
 637                                   struct lttng_ctx **ctx);
 638 #else
 639 static inline
 640 int lttng_add_perf_counter_to_ctx(uint32_t type,
 641                                   uint64_t config,
 642                                   const char *name,
 643                                   struct lttng_ctx **ctx)
 644 {
 645         return -ENOSYS;
 646 }
 647 #endif
 648
 649 int lttng_logger_init(void);
 650 void lttng_logger_exit(void);
 651
 652 extern int lttng_statedump_start(struct lttng_session *session);
 653
 654 #ifdef CONFIG_KPROBES
 655 int lttng_kprobes_register(const char *name,
 656                 const char *symbol_name,
 657                 uint64_t offset,
 658                 uint64_t addr,
 659                 struct lttng_event *event);
 660 void lttng_kprobes_unregister(struct lttng_event *event);
 661 void lttng_kprobes_destroy_private(struct lttng_event *event);
 662 #else
 663 static inline
 664 int lttng_kprobes_register(const char *name,
 665                 const char *symbol_name,
 666                 uint64_t offset,
 667                 uint64_t addr,
 668                 struct lttng_event *event)
 669 {
 670         return -ENOSYS;
 671 }
 672
 673 static inline
 674 void lttng_kprobes_unregister(struct lttng_event *event)
 675 {
 676 }
 677
 678 static inline
 679 void lttng_kprobes_destroy_private(struct lttng_event *event)
 680 {
 681 }
 682 #endif
 683
 684 #ifdef CONFIG_KRETPROBES
 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 void lttng_kretprobes_unregister(struct lttng_event *event);
 692 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 693 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 694         int enable);
 695 #else
 696 static inline
 697 int lttng_kretprobes_register(const char *name,
 698                 const char *symbol_name,
 699                 uint64_t offset,
 700                 uint64_t addr,
 701                 struct lttng_event *event_entry,
 702                 struct lttng_event *event_exit)
 703 {
 704         return -ENOSYS;
 705 }
 706
 707 static inline
 708 void lttng_kretprobes_unregister(struct lttng_event *event)
 709 {
 710 }
 711
 712 static inline
 713 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 714 {
 715 }
 716
 717 static inline
 718 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 719         int enable)
 720 {
 721         return -ENOSYS;
 722 }
 723 #endif
 724
 725 #ifdef CONFIG_DYNAMIC_FTRACE
 726 int lttng_ftrace_register(const char *name,
 727                           const char *symbol_name,
 728                           struct lttng_event *event);
 729 void lttng_ftrace_unregister(struct lttng_event *event);
 730 void lttng_ftrace_destroy_private(struct lttng_event *event);
 731 #else
 732 static inline
 733 int lttng_ftrace_register(const char *name,
 734                           const char *symbol_name,
 735                           struct lttng_event *event)
 736 {
 737         return -ENOSYS;
 738 }
 739
 740 static inline
 741 void lttng_ftrace_unregister(struct lttng_event *event)
 742 {
 743 }
 744
 745 static inline
 746 void lttng_ftrace_destroy_private(struct lttng_event *event)
 747 {
 748 }
 749 #endif
 750
 751 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 752
 753 extern const struct file_operations lttng_tracepoint_list_fops;
 754 extern const struct file_operations lttng_syscall_list_fops;
 755
 756 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 757 #define TRACEPOINT_HAS_DATA_ARG
 758 #endif
 759
 760 #endif /* _LTTNG_EVENTS_H */