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 /* FIXME test */
  35 #undef CONFIG_HAVE_SYSCALL_TRACEPOINTS
  36
  37 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  38
  39 struct lttng_channel;
  40 struct lttng_session;
  41 struct lttng_metadata_cache;
  42 struct lib_ring_buffer_ctx;
  43 struct perf_event;
  44 struct perf_event_attr;
  45 struct lib_ring_buffer_config;
  46
  47 /* Type description */
  48
  49 /* Update the astract_types name table in lttng-types.c along with this enum */
  50 enum abstract_types {
  51         atype_integer,
  52         atype_enum,
  53         atype_array,
  54         atype_sequence,
  55         atype_string,
  56         NR_ABSTRACT_TYPES,
  57 };
  58
  59 /* Update the string_encodings name table in lttng-types.c along with this enum */
  60 enum lttng_string_encodings {
  61         lttng_encode_none = 0,
  62         lttng_encode_UTF8 = 1,
  63         lttng_encode_ASCII = 2,
  64         NR_STRING_ENCODINGS,
  65 };
  66
  67 enum channel_type {
  68         PER_CPU_CHANNEL,
  69         METADATA_CHANNEL,
  70 };
  71
  72 struct lttng_enum_entry {
  73         unsigned long long start, end;  /* start and end are inclusive */
  74         const char *string;
  75 };
  76
  77 #define __type_integer(_type, _byte_order, _base, _encoding)    \
  78         {                                                       \
  79             .atype = atype_integer,                             \
  80             .u.basic.integer =                                  \
  81                 {                                               \
  82                   .size = sizeof(_type) * CHAR_BIT,             \
  83                   .alignment = lttng_alignof(_type) * CHAR_BIT, \
  84                   .signedness = lttng_is_signed_type(_type),    \
  85                   .reverse_byte_order = _byte_order != __BYTE_ORDER,    \
  86                   .base = _base,                                \
  87                   .encoding = lttng_encode_##_encoding,         \
  88                 },                                              \
  89         }                                                       \
  90
  91 struct lttng_integer_type {
  92         unsigned int size;              /* in bits */
  93         unsigned short alignment;       /* in bits */
  94         unsigned int signedness:1,
  95                 reverse_byte_order:1;
  96         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  97         enum lttng_string_encodings encoding;
  98 };
  99
 100 union _lttng_basic_type {
 101         struct lttng_integer_type integer;
 102         struct {
 103                 const char *name;
 104         } enumeration;
 105         struct {
 106                 enum lttng_string_encodings encoding;
 107         } string;
 108 };
 109
 110 struct lttng_basic_type {
 111         enum abstract_types atype;
 112         union {
 113                 union _lttng_basic_type basic;
 114         } u;
 115 };
 116
 117 struct lttng_type {
 118         enum abstract_types atype;
 119         union {
 120                 union _lttng_basic_type basic;
 121                 struct {
 122                         struct lttng_basic_type elem_type;
 123                         unsigned int length;            /* num. elems. */
 124                 } array;
 125                 struct {
 126                         struct lttng_basic_type length_type;
 127                         struct lttng_basic_type elem_type;
 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 };
 365
 366 struct lttng_transport {
 367         char *name;
 368         struct module *owner;
 369         struct list_head node;
 370         struct lttng_channel_ops ops;
 371 };
 372
 373 struct lttng_syscall_filter;
 374
 375 #define LTTNG_EVENT_HT_BITS             12
 376 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 377
 378 struct lttng_event_ht {
 379         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 380 };
 381
 382 struct lttng_channel {
 383         unsigned int id;
 384         struct channel *chan;           /* Channel buffers */
 385         int enabled;
 386         struct lttng_ctx *ctx;
 387         /* Event ID management */
 388         struct lttng_session *session;
 389         struct file *file;              /* File associated to channel */
 390         unsigned int free_event_id;     /* Next event ID to allocate */
 391         struct list_head list;          /* Channel list */
 392         struct lttng_channel_ops *ops;
 393         struct lttng_transport *transport;
 394         struct lttng_event **sc_table;  /* for syscall tracing */
 395         struct lttng_event **compat_sc_table;
 396         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 397         struct lttng_event **compat_sc_exit_table;
 398         struct lttng_event *sc_unknown; /* for unknown syscalls */
 399         struct lttng_event *sc_compat_unknown;
 400         struct lttng_event *sc_exit_unknown;
 401         struct lttng_event *compat_sc_exit_unknown;
 402         struct lttng_syscall_filter *sc_filter;
 403         int header_type;                /* 0: unset, 1: compact, 2: large */
 404         enum channel_type channel_type;
 405         unsigned int metadata_dumped:1,
 406                 sys_enter_registered:1,
 407                 sys_exit_registered:1,
 408                 syscall_all:1,
 409                 tstate:1;               /* Transient enable state */
 410 };
 411
 412 struct lttng_metadata_stream {
 413         void *priv;                     /* Ring buffer private data */
 414         struct lttng_metadata_cache *metadata_cache;
 415         unsigned int metadata_in;       /* Bytes read from the cache */
 416         unsigned int metadata_out;      /* Bytes consumed from stream */
 417         int finalized;                  /* Has channel been finalized */
 418         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 419         struct list_head list;          /* Stream list */
 420         struct lttng_transport *transport;
 421         struct mutex lock;
 422 };
 423
 424
 425 /*
 426  * struct lttng_pid_tracker declared in header due to deferencing of *v
 427  * in RCU_INITIALIZER(v).
 428  */
 429 #define LTTNG_PID_HASH_BITS     6
 430 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 431
 432 struct lttng_pid_tracker {
 433         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 434 };
 435
 436 struct lttng_pid_hash_node {
 437         struct hlist_node hlist;
 438         int pid;
 439 };
 440
 441 struct lttng_session {
 442         int active;                     /* Is trace session active ? */
 443         int been_active;                /* Has trace session been active ? */
 444         struct file *file;              /* File associated to session */
 445         struct list_head chan;          /* Channel list head */
 446         struct list_head events;        /* Event list head */
 447         struct list_head list;          /* Session list */
 448         unsigned int free_chan_id;      /* Next chan ID to allocate */
 449         uuid_le uuid;                   /* Trace session unique ID */
 450         struct lttng_metadata_cache *metadata_cache;
 451         struct lttng_pid_tracker *pid_tracker;
 452         unsigned int metadata_dumped:1,
 453                 tstate:1;               /* Transient enable state */
 454         /* List of enablers */
 455         struct list_head enablers_head;
 456         /* Hash table of events */
 457         struct lttng_event_ht events_ht;
 458 };
 459
 460 struct lttng_metadata_cache {
 461         char *data;                     /* Metadata cache */
 462         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 463         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 464         struct kref refcount;           /* Metadata cache usage */
 465         struct list_head metadata_stream;       /* Metadata stream list */
 466         uuid_le uuid;                   /* Trace session unique ID (copy) */
 467 };
 468
 469 void lttng_lock_sessions(void);
 470 void lttng_unlock_sessions(void);
 471
 472 struct list_head *lttng_get_probe_list_head(void);
 473
 474 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 475                 struct lttng_kernel_event *event_param,
 476                 struct lttng_channel *chan);
 477
 478 int lttng_enabler_enable(struct lttng_enabler *enabler);
 479 int lttng_enabler_disable(struct lttng_enabler *enabler);
 480 int lttng_fix_pending_events(void);
 481 int lttng_session_active(void);
 482
 483 struct lttng_session *lttng_session_create(void);
 484 int lttng_session_enable(struct lttng_session *session);
 485 int lttng_session_disable(struct lttng_session *session);
 486 void lttng_session_destroy(struct lttng_session *session);
 487 void metadata_cache_destroy(struct kref *kref);
 488
 489 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 490                                        const char *transport_name,
 491                                        void *buf_addr,
 492                                        size_t subbuf_size, size_t num_subbuf,
 493                                        unsigned int switch_timer_interval,
 494                                        unsigned int read_timer_interval,
 495                                        enum channel_type channel_type);
 496 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 497                                        int overwrite, void *buf_addr,
 498                                        size_t subbuf_size, size_t num_subbuf,
 499                                        unsigned int switch_timer_interval,
 500                                        unsigned int read_timer_interval);
 501
 502 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 503 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 504                                 struct lttng_kernel_event *event_param,
 505                                 void *filter,
 506                                 const struct lttng_event_desc *event_desc,
 507                                 enum lttng_kernel_instrumentation itype);
 508 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 509                                 struct lttng_kernel_event *event_param,
 510                                 void *filter,
 511                                 const struct lttng_event_desc *event_desc,
 512                                 enum lttng_kernel_instrumentation itype);
 513 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 514                 struct lttng_kernel_old_event *old_event_param,
 515                 void *filter,
 516                 const struct lttng_event_desc *internal_desc);
 517
 518 int lttng_channel_enable(struct lttng_channel *channel);
 519 int lttng_channel_disable(struct lttng_channel *channel);
 520 int lttng_event_enable(struct lttng_event *event);
 521 int lttng_event_disable(struct lttng_event *event);
 522
 523 void lttng_transport_register(struct lttng_transport *transport);
 524 void lttng_transport_unregister(struct lttng_transport *transport);
 525
 526 void synchronize_trace(void);
 527 int lttng_abi_init(void);
 528 int lttng_abi_compat_old_init(void);
 529 void lttng_abi_exit(void);
 530 void lttng_abi_compat_old_exit(void);
 531
 532 int lttng_probe_register(struct lttng_probe_desc *desc);
 533 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 534 const struct lttng_event_desc *lttng_event_get(const char *name);
 535 void lttng_event_put(const struct lttng_event_desc *desc);
 536 int lttng_probes_init(void);
 537 void lttng_probes_exit(void);
 538
 539 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 540                 struct channel *chan);
 541
 542 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 543 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 544 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 545 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 546 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 547 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 548
 549 int lttng_session_track_pid(struct lttng_session *session, int pid);
 550 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 551
 552 int lttng_session_list_tracker_pids(struct lttng_session *session);
 553
 554 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 555 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 556 int lttng_syscalls_unregister(struct lttng_channel *chan);
 557 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 558                 const char *name);
 559 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 560                 const char *name);
 561 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 562                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 563 int lttng_abi_syscall_list(void);
 564 #else
 565 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 566 {
 567         return -ENOSYS;
 568 }
 569
 570 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 571 {
 572         return 0;
 573 }
 574
 575 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 576                 const char *name)
 577 {
 578         return -ENOSYS;
 579 }
 580
 581 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 582                 const char *name)
 583 {
 584         return -ENOSYS;
 585 }
 586
 587 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 588                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 589 {
 590         return -ENOSYS;
 591 }
 592
 593 static inline
 594 int lttng_abi_syscall_list(void)
 595 {
 596         return -ENOSYS;
 597 }
 598 #endif
 599
 600 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 601 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 602                 struct lttng_kernel_filter_bytecode __user *bytecode);
 603 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 604                 struct lttng_enabler *enabler);
 605
 606 extern struct lttng_ctx *lttng_static_ctx;
 607
 608 int lttng_context_init(void);
 609 void lttng_context_exit(void);
 610 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 611 void lttng_context_update(struct lttng_ctx *ctx);
 612 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 613 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 614 void lttng_remove_context_field(struct lttng_ctx **ctx,
 615                                 struct lttng_ctx_field *field);
 616 void lttng_destroy_context(struct lttng_ctx *ctx);
 617 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 618 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 619 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 620 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 621 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 622 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 623 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 624 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 625 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 626 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 627 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 628 int lttng_add_perf_counter_to_ctx(uint32_t type,
 629                                   uint64_t config,
 630                                   const char *name,
 631                                   struct lttng_ctx **ctx);
 632 #else
 633 static inline
 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 {
 639         return -ENOSYS;
 640 }
 641 #endif
 642
 643 int lttng_logger_init(void);
 644 void lttng_logger_exit(void);
 645
 646 extern int lttng_statedump_start(struct lttng_session *session);
 647
 648 #ifdef CONFIG_KPROBES
 649 int lttng_kprobes_register(const char *name,
 650                 const char *symbol_name,
 651                 uint64_t offset,
 652                 uint64_t addr,
 653                 struct lttng_event *event);
 654 void lttng_kprobes_unregister(struct lttng_event *event);
 655 void lttng_kprobes_destroy_private(struct lttng_event *event);
 656 #else
 657 static inline
 658 int lttng_kprobes_register(const char *name,
 659                 const char *symbol_name,
 660                 uint64_t offset,
 661                 uint64_t addr,
 662                 struct lttng_event *event)
 663 {
 664         return -ENOSYS;
 665 }
 666
 667 static inline
 668 void lttng_kprobes_unregister(struct lttng_event *event)
 669 {
 670 }
 671
 672 static inline
 673 void lttng_kprobes_destroy_private(struct lttng_event *event)
 674 {
 675 }
 676 #endif
 677
 678 #ifdef CONFIG_KRETPROBES
 679 int lttng_kretprobes_register(const char *name,
 680                 const char *symbol_name,
 681                 uint64_t offset,
 682                 uint64_t addr,
 683                 struct lttng_event *event_entry,
 684                 struct lttng_event *event_exit);
 685 void lttng_kretprobes_unregister(struct lttng_event *event);
 686 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 687 #else
 688 static inline
 689 int lttng_kretprobes_register(const char *name,
 690                 const char *symbol_name,
 691                 uint64_t offset,
 692                 uint64_t addr,
 693                 struct lttng_event *event_entry,
 694                 struct lttng_event *event_exit)
 695 {
 696         return -ENOSYS;
 697 }
 698
 699 static inline
 700 void lttng_kretprobes_unregister(struct lttng_event *event)
 701 {
 702 }
 703
 704 static inline
 705 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 706 {
 707 }
 708 #endif
 709
 710 #ifdef CONFIG_DYNAMIC_FTRACE
 711 int lttng_ftrace_register(const char *name,
 712                           const char *symbol_name,
 713                           struct lttng_event *event);
 714 void lttng_ftrace_unregister(struct lttng_event *event);
 715 void lttng_ftrace_destroy_private(struct lttng_event *event);
 716 #else
 717 static inline
 718 int lttng_ftrace_register(const char *name,
 719                           const char *symbol_name,
 720                           struct lttng_event *event)
 721 {
 722         return -ENOSYS;
 723 }
 724
 725 static inline
 726 void lttng_ftrace_unregister(struct lttng_event *event)
 727 {
 728 }
 729
 730 static inline
 731 void lttng_ftrace_destroy_private(struct lttng_event *event)
 732 {
 733 }
 734 #endif
 735
 736 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 737
 738 extern const struct file_operations lttng_tracepoint_list_fops;
 739 extern const struct file_operations lttng_syscall_list_fops;
 740
 741 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 742 #define TRACEPOINT_HAS_DATA_ARG
 743 #endif
 744
 745 #endif /* _LTTNG_EVENTS_H */