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