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 /*
 144  * We need to keep this perf counter field separately from struct
 145  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 146  */
 147 struct lttng_perf_counter_field {
 148         struct notifier_block nb;
 149         int hp_enable;
 150         struct perf_event_attr *attr;
 151         struct perf_event **e;  /* per-cpu array */
 152 };
 153
 154 struct lttng_ctx_field {
 155         struct lttng_event_field event_field;
 156         size_t (*get_size)(size_t offset);
 157         void (*record)(struct lttng_ctx_field *field,
 158                        struct lib_ring_buffer_ctx *ctx,
 159                        struct lttng_channel *chan);
 160         union {
 161                 struct lttng_perf_counter_field *perf_counter;
 162         } u;
 163         void (*destroy)(struct lttng_ctx_field *field);
 164 };
 165
 166 struct lttng_ctx {
 167         struct lttng_ctx_field *fields;
 168         unsigned int nr_fields;
 169         unsigned int allocated_fields;
 170         size_t largest_align;   /* in bytes */
 171 };
 172
 173 struct lttng_event_desc {
 174         const char *name;               /* lttng-modules name */
 175         const char *kname;              /* Linux kernel name (tracepoints) */
 176         void *probe_callback;
 177         const struct lttng_event_ctx *ctx;      /* context */
 178         const struct lttng_event_field *fields; /* event payload */
 179         unsigned int nr_fields;
 180         struct module *owner;
 181 };
 182
 183 struct lttng_probe_desc {
 184         const char *provider;
 185         const struct lttng_event_desc **event_desc;
 186         unsigned int nr_events;
 187         struct list_head head;                  /* chain registered probes */
 188         struct list_head lazy_init_head;
 189         int lazy;                               /* lazy registration */
 190 };
 191
 192 struct lttng_krp;                               /* Kretprobe handling */
 193
 194 enum lttng_event_type {
 195         LTTNG_TYPE_EVENT = 0,
 196         LTTNG_TYPE_ENABLER = 1,
 197 };
 198
 199 /*
 200  * Objects in a linked-list of enablers, owned by an event.
 201  */
 202 struct lttng_enabler_ref {
 203         struct list_head node;                  /* enabler ref list */
 204         struct lttng_enabler *ref;              /* backward ref */
 205 };
 206
 207 /*
 208  * lttng_event structure is referred to by the tracing fast path. It must be
 209  * kept small.
 210  */
 211 struct lttng_event {
 212         enum lttng_event_type evtype;   /* First field. */
 213         unsigned int id;
 214         struct lttng_channel *chan;
 215         int enabled;
 216         const struct lttng_event_desc *desc;
 217         void *filter;
 218         struct lttng_ctx *ctx;
 219         enum lttng_kernel_instrumentation instrumentation;
 220         union {
 221                 struct {
 222                         struct kprobe kp;
 223                         char *symbol_name;
 224                 } kprobe;
 225                 struct {
 226                         struct lttng_krp *lttng_krp;
 227                         char *symbol_name;
 228                 } kretprobe;
 229                 struct {
 230                         char *symbol_name;
 231                 } ftrace;
 232         } u;
 233         struct list_head list;          /* Event list in session */
 234         unsigned int metadata_dumped:1;
 235
 236         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 237         struct list_head enablers_ref_head;
 238         struct hlist_node hlist;        /* session ht of events */
 239         int registered;                 /* has reg'd tracepoint probe */
 240 };
 241
 242 enum lttng_enabler_type {
 243         LTTNG_ENABLER_WILDCARD,
 244         LTTNG_ENABLER_NAME,
 245 };
 246
 247 /*
 248  * Enabler field, within whatever object is enabling an event. Target of
 249  * backward reference.
 250  */
 251 struct lttng_enabler {
 252         enum lttng_event_type evtype;   /* First field. */
 253
 254         enum lttng_enabler_type type;
 255
 256         struct list_head node;  /* per-session list of enablers */
 257
 258         struct lttng_kernel_event event_param;
 259         struct lttng_channel *chan;
 260         struct lttng_ctx *ctx;
 261         unsigned int enabled:1;
 262 };
 263
 264 struct lttng_channel_ops {
 265         struct channel *(*channel_create)(const char *name,
 266                                 struct lttng_channel *lttng_chan,
 267                                 void *buf_addr,
 268                                 size_t subbuf_size, size_t num_subbuf,
 269                                 unsigned int switch_timer_interval,
 270                                 unsigned int read_timer_interval);
 271         void (*channel_destroy)(struct channel *chan);
 272         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 273         int (*buffer_has_read_closed_stream)(struct channel *chan);
 274         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 275         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 276                              uint32_t event_id);
 277         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 278         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 279                             size_t len);
 280         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 281                                       const void *src, size_t len);
 282         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 283                              int c, size_t len);
 284         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 285                              size_t len);
 286         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 287                                        const char __user *src, size_t len);
 288         /*
 289          * packet_avail_size returns the available size in the current
 290          * packet. Note that the size returned is only a hint, since it
 291          * may change due to concurrent writes.
 292          */
 293         size_t (*packet_avail_size)(struct channel *chan);
 294         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 295         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 296         int (*is_finalized)(struct channel *chan);
 297         int (*is_disabled)(struct channel *chan);
 298         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 299                         struct lib_ring_buffer *bufb,
 300                         uint64_t *timestamp_begin);
 301         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 302                         struct lib_ring_buffer *bufb,
 303                         uint64_t *timestamp_end);
 304         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 305                         struct lib_ring_buffer *bufb,
 306                         uint64_t *events_discarded);
 307         int (*content_size) (const struct lib_ring_buffer_config *config,
 308                         struct lib_ring_buffer *bufb,
 309                         uint64_t *content_size);
 310         int (*packet_size) (const struct lib_ring_buffer_config *config,
 311                         struct lib_ring_buffer *bufb,
 312                         uint64_t *packet_size);
 313         int (*stream_id) (const struct lib_ring_buffer_config *config,
 314                         struct lib_ring_buffer *bufb,
 315                         uint64_t *stream_id);
 316         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 317                         struct lib_ring_buffer *bufb,
 318                         uint64_t *ts);
 319 };
 320
 321 struct lttng_transport {
 322         char *name;
 323         struct module *owner;
 324         struct list_head node;
 325         struct lttng_channel_ops ops;
 326 };
 327
 328 struct lttng_syscall_filter;
 329
 330 #define LTTNG_EVENT_HT_BITS             12
 331 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 332
 333 struct lttng_event_ht {
 334         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 335 };
 336
 337 struct lttng_channel {
 338         unsigned int id;
 339         struct channel *chan;           /* Channel buffers */
 340         int enabled;
 341         struct lttng_ctx *ctx;
 342         /* Event ID management */
 343         struct lttng_session *session;
 344         struct file *file;              /* File associated to channel */
 345         unsigned int free_event_id;     /* Next event ID to allocate */
 346         struct list_head list;          /* Channel list */
 347         struct lttng_channel_ops *ops;
 348         struct lttng_transport *transport;
 349         struct lttng_event **sc_table;  /* for syscall tracing */
 350         struct lttng_event **compat_sc_table;
 351         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 352         struct lttng_event **compat_sc_exit_table;
 353         struct lttng_event *sc_unknown; /* for unknown syscalls */
 354         struct lttng_event *sc_compat_unknown;
 355         struct lttng_event *sc_exit_unknown;
 356         struct lttng_event *compat_sc_exit_unknown;
 357         struct lttng_syscall_filter *sc_filter;
 358         int header_type;                /* 0: unset, 1: compact, 2: large */
 359         enum channel_type channel_type;
 360         unsigned int metadata_dumped:1,
 361                 sys_enter_registered:1,
 362                 sys_exit_registered:1,
 363                 syscall_all:1,
 364                 tstate:1;               /* Transient enable state */
 365 };
 366
 367 struct lttng_metadata_stream {
 368         void *priv;                     /* Ring buffer private data */
 369         struct lttng_metadata_cache *metadata_cache;
 370         unsigned int metadata_in;       /* Bytes read from the cache */
 371         unsigned int metadata_out;      /* Bytes consumed from stream */
 372         int finalized;                  /* Has channel been finalized */
 373         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 374         struct list_head list;          /* Stream list */
 375         struct lttng_transport *transport;
 376         struct mutex lock;
 377 };
 378
 379
 380 /*
 381  * struct lttng_pid_tracker declared in header due to deferencing of *v
 382  * in RCU_INITIALIZER(v).
 383  */
 384 #define LTTNG_PID_HASH_BITS     6
 385 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 386
 387 struct lttng_pid_tracker {
 388         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 389 };
 390
 391 struct lttng_pid_hash_node {
 392         struct hlist_node hlist;
 393         int pid;
 394 };
 395
 396 struct lttng_session {
 397         int active;                     /* Is trace session active ? */
 398         int been_active;                /* Has trace session been active ? */
 399         struct file *file;              /* File associated to session */
 400         struct list_head chan;          /* Channel list head */
 401         struct list_head events;        /* Event list head */
 402         struct list_head list;          /* Session list */
 403         unsigned int free_chan_id;      /* Next chan ID to allocate */
 404         uuid_le uuid;                   /* Trace session unique ID */
 405         struct lttng_metadata_cache *metadata_cache;
 406         struct lttng_pid_tracker *pid_tracker;
 407         unsigned int metadata_dumped:1,
 408                 tstate:1;               /* Transient enable state */
 409         /* List of enablers */
 410         struct list_head enablers_head;
 411         /* Hash table of events */
 412         struct lttng_event_ht events_ht;
 413 };
 414
 415 struct lttng_metadata_cache {
 416         char *data;                     /* Metadata cache */
 417         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 418         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 419         struct kref refcount;           /* Metadata cache usage */
 420         struct list_head metadata_stream;       /* Metadata stream list */
 421         uuid_le uuid;                   /* Trace session unique ID (copy) */
 422 };
 423
 424 void lttng_lock_sessions(void);
 425 void lttng_unlock_sessions(void);
 426
 427 struct list_head *lttng_get_probe_list_head(void);
 428
 429 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 430                 struct lttng_kernel_event *event_param,
 431                 struct lttng_channel *chan);
 432
 433 int lttng_enabler_enable(struct lttng_enabler *enabler);
 434 int lttng_enabler_disable(struct lttng_enabler *enabler);
 435 int lttng_fix_pending_events(void);
 436 int lttng_session_active(void);
 437
 438 struct lttng_session *lttng_session_create(void);
 439 int lttng_session_enable(struct lttng_session *session);
 440 int lttng_session_disable(struct lttng_session *session);
 441 void lttng_session_destroy(struct lttng_session *session);
 442 void metadata_cache_destroy(struct kref *kref);
 443
 444 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 445                                        const char *transport_name,
 446                                        void *buf_addr,
 447                                        size_t subbuf_size, size_t num_subbuf,
 448                                        unsigned int switch_timer_interval,
 449                                        unsigned int read_timer_interval,
 450                                        enum channel_type channel_type);
 451 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 452                                        int overwrite, void *buf_addr,
 453                                        size_t subbuf_size, size_t num_subbuf,
 454                                        unsigned int switch_timer_interval,
 455                                        unsigned int read_timer_interval);
 456
 457 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 458 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 459                                 struct lttng_kernel_event *event_param,
 460                                 void *filter,
 461                                 const struct lttng_event_desc *event_desc,
 462                                 enum lttng_kernel_instrumentation itype);
 463 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 464                 struct lttng_kernel_old_event *old_event_param,
 465                 void *filter,
 466                 const struct lttng_event_desc *internal_desc);
 467
 468 int lttng_channel_enable(struct lttng_channel *channel);
 469 int lttng_channel_disable(struct lttng_channel *channel);
 470 int lttng_event_enable(struct lttng_event *event);
 471 int lttng_event_disable(struct lttng_event *event);
 472
 473 void lttng_transport_register(struct lttng_transport *transport);
 474 void lttng_transport_unregister(struct lttng_transport *transport);
 475
 476 void synchronize_trace(void);
 477 int lttng_abi_init(void);
 478 int lttng_abi_compat_old_init(void);
 479 void lttng_abi_exit(void);
 480 void lttng_abi_compat_old_exit(void);
 481
 482 int lttng_probe_register(struct lttng_probe_desc *desc);
 483 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 484 const struct lttng_event_desc *lttng_event_get(const char *name);
 485 void lttng_event_put(const struct lttng_event_desc *desc);
 486 int lttng_probes_init(void);
 487 void lttng_probes_exit(void);
 488
 489 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 490                 struct channel *chan);
 491
 492 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 493 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 494 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 495 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 496 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 497 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 498
 499 int lttng_session_track_pid(struct lttng_session *session, int pid);
 500 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 501
 502 int lttng_session_list_tracker_pids(struct lttng_session *session);
 503
 504 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 505 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 506 int lttng_syscalls_unregister(struct lttng_channel *chan);
 507 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 508                 const char *name);
 509 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 510                 const char *name);
 511 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 512                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 513 int lttng_abi_syscall_list(void);
 514 #else
 515 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 516 {
 517         return -ENOSYS;
 518 }
 519
 520 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 521 {
 522         return 0;
 523 }
 524
 525 static inline
 526 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 527                 const char *name)
 528 {
 529         return -ENOSYS;
 530 }
 531
 532 static inline
 533 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 534                 const char *name)
 535 {
 536         return -ENOSYS;
 537 }
 538
 539 static inline
 540 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 541                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 542 {
 543         return -ENOSYS;
 544 }
 545
 546 static inline
 547 int lttng_abi_syscall_list(void)
 548 {
 549         return -ENOSYS;
 550 }
 551 #endif
 552
 553 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 554 void lttng_context_update(struct lttng_ctx *ctx);
 555 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 556 void lttng_remove_context_field(struct lttng_ctx **ctx,
 557                                 struct lttng_ctx_field *field);
 558 void lttng_destroy_context(struct lttng_ctx *ctx);
 559 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 560 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 561 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 562 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 563 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 564 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 565 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 566 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 567 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 568 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 569 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 570 int lttng_add_perf_counter_to_ctx(uint32_t type,
 571                                   uint64_t config,
 572                                   const char *name,
 573                                   struct lttng_ctx **ctx);
 574 #else
 575 static inline
 576 int lttng_add_perf_counter_to_ctx(uint32_t type,
 577                                   uint64_t config,
 578                                   const char *name,
 579                                   struct lttng_ctx **ctx)
 580 {
 581         return -ENOSYS;
 582 }
 583 #endif
 584
 585 int lttng_logger_init(void);
 586 void lttng_logger_exit(void);
 587
 588 extern int lttng_statedump_start(struct lttng_session *session);
 589
 590 #ifdef CONFIG_KPROBES
 591 int lttng_kprobes_register(const char *name,
 592                 const char *symbol_name,
 593                 uint64_t offset,
 594                 uint64_t addr,
 595                 struct lttng_event *event);
 596 void lttng_kprobes_unregister(struct lttng_event *event);
 597 void lttng_kprobes_destroy_private(struct lttng_event *event);
 598 #else
 599 static inline
 600 int lttng_kprobes_register(const char *name,
 601                 const char *symbol_name,
 602                 uint64_t offset,
 603                 uint64_t addr,
 604                 struct lttng_event *event)
 605 {
 606         return -ENOSYS;
 607 }
 608
 609 static inline
 610 void lttng_kprobes_unregister(struct lttng_event *event)
 611 {
 612 }
 613
 614 static inline
 615 void lttng_kprobes_destroy_private(struct lttng_event *event)
 616 {
 617 }
 618 #endif
 619
 620 #ifdef CONFIG_KRETPROBES
 621 int lttng_kretprobes_register(const char *name,
 622                 const char *symbol_name,
 623                 uint64_t offset,
 624                 uint64_t addr,
 625                 struct lttng_event *event_entry,
 626                 struct lttng_event *event_exit);
 627 void lttng_kretprobes_unregister(struct lttng_event *event);
 628 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 629 #else
 630 static inline
 631 int lttng_kretprobes_register(const char *name,
 632                 const char *symbol_name,
 633                 uint64_t offset,
 634                 uint64_t addr,
 635                 struct lttng_event *event_entry,
 636                 struct lttng_event *event_exit)
 637 {
 638         return -ENOSYS;
 639 }
 640
 641 static inline
 642 void lttng_kretprobes_unregister(struct lttng_event *event)
 643 {
 644 }
 645
 646 static inline
 647 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 648 {
 649 }
 650 #endif
 651
 652 #ifdef CONFIG_DYNAMIC_FTRACE
 653 int lttng_ftrace_register(const char *name,
 654                           const char *symbol_name,
 655                           struct lttng_event *event);
 656 void lttng_ftrace_unregister(struct lttng_event *event);
 657 void lttng_ftrace_destroy_private(struct lttng_event *event);
 658 #else
 659 static inline
 660 int lttng_ftrace_register(const char *name,
 661                           const char *symbol_name,
 662                           struct lttng_event *event)
 663 {
 664         return -ENOSYS;
 665 }
 666
 667 static inline
 668 void lttng_ftrace_unregister(struct lttng_event *event)
 669 {
 670 }
 671
 672 static inline
 673 void lttng_ftrace_destroy_private(struct lttng_event *event)
 674 {
 675 }
 676 #endif
 677
 678 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 679
 680 extern const struct file_operations lttng_tracepoint_list_fops;
 681 extern const struct file_operations lttng_syscall_list_fops;
 682
 683 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 684 #define TRACEPOINT_HAS_DATA_ARG
 685 #endif
 686
 687 #endif /* _LTTNG_EVENTS_H */