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_probe_ctx {
 166         struct lttng_event *event;
 167         uint8_t interruptible;
 168 };
 169
 170 struct lttng_ctx_field {
 171         struct lttng_event_field event_field;
 172         size_t (*get_size)(size_t offset);
 173         void (*record)(struct lttng_ctx_field *field,
 174                        struct lib_ring_buffer_ctx *ctx,
 175                        struct lttng_channel *chan);
 176         void (*get_value)(struct lttng_ctx_field *field,
 177                          struct lttng_probe_ctx *lttng_probe_ctx,
 178                          union lttng_ctx_value *value);
 179         union {
 180                 struct lttng_perf_counter_field *perf_counter;
 181         } u;
 182         void (*destroy)(struct lttng_ctx_field *field);
 183 };
 184
 185 struct lttng_ctx {
 186         struct lttng_ctx_field *fields;
 187         unsigned int nr_fields;
 188         unsigned int allocated_fields;
 189         size_t largest_align;   /* in bytes */
 190 };
 191
 192 struct lttng_event_desc {
 193         const char *name;               /* lttng-modules name */
 194         const char *kname;              /* Linux kernel name (tracepoints) */
 195         void *probe_callback;
 196         const struct lttng_event_ctx *ctx;      /* context */
 197         const struct lttng_event_field *fields; /* event payload */
 198         unsigned int nr_fields;
 199         struct module *owner;
 200 };
 201
 202 struct lttng_probe_desc {
 203         const char *provider;
 204         const struct lttng_event_desc **event_desc;
 205         unsigned int nr_events;
 206         struct list_head head;                  /* chain registered probes */
 207         struct list_head lazy_init_head;
 208         int lazy;                               /* lazy registration */
 209 };
 210
 211 struct lttng_krp;                               /* Kretprobe handling */
 212
 213 enum lttng_event_type {
 214         LTTNG_TYPE_EVENT = 0,
 215         LTTNG_TYPE_ENABLER = 1,
 216 };
 217
 218 struct lttng_filter_bytecode_node {
 219         struct list_head node;
 220         struct lttng_enabler *enabler;
 221         /*
 222          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 223          * last field.
 224          */
 225         struct lttng_kernel_filter_bytecode bc;
 226 };
 227
 228 /*
 229  * Filter return value masks.
 230  */
 231 enum lttng_filter_ret {
 232         LTTNG_FILTER_DISCARD = 0,
 233         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 234         /* Other bits are kept for future use. */
 235 };
 236
 237 struct lttng_bytecode_runtime {
 238         /* Associated bytecode */
 239         struct lttng_filter_bytecode_node *bc;
 240         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 241                         const char *filter_stack_data);
 242         int link_failed;
 243         struct list_head node;  /* list of bytecode runtime in event */
 244 };
 245
 246 /*
 247  * Objects in a linked-list of enablers, owned by an event.
 248  */
 249 struct lttng_enabler_ref {
 250         struct list_head node;                  /* enabler ref list */
 251         struct lttng_enabler *ref;              /* backward ref */
 252 };
 253
 254 /*
 255  * lttng_event structure is referred to by the tracing fast path. It must be
 256  * kept small.
 257  */
 258 struct lttng_event {
 259         enum lttng_event_type evtype;   /* First field. */
 260         unsigned int id;
 261         struct lttng_channel *chan;
 262         int enabled;
 263         const struct lttng_event_desc *desc;
 264         void *filter;
 265         struct lttng_ctx *ctx;
 266         enum lttng_kernel_instrumentation instrumentation;
 267         union {
 268                 struct {
 269                         struct kprobe kp;
 270                         char *symbol_name;
 271                 } kprobe;
 272                 struct {
 273                         struct lttng_krp *lttng_krp;
 274                         char *symbol_name;
 275                 } kretprobe;
 276                 struct {
 277                         char *symbol_name;
 278                 } ftrace;
 279         } u;
 280         struct list_head list;          /* Event list in session */
 281         unsigned int metadata_dumped:1;
 282
 283         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 284         struct list_head enablers_ref_head;
 285         struct hlist_node hlist;        /* session ht of events */
 286         int registered;                 /* has reg'd tracepoint probe */
 287         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 288         struct list_head bytecode_runtime_head;
 289         int has_enablers_without_bytecode;
 290 };
 291
 292 enum lttng_enabler_type {
 293         LTTNG_ENABLER_WILDCARD,
 294         LTTNG_ENABLER_NAME,
 295 };
 296
 297 /*
 298  * Enabler field, within whatever object is enabling an event. Target of
 299  * backward reference.
 300  */
 301 struct lttng_enabler {
 302         enum lttng_event_type evtype;   /* First field. */
 303
 304         enum lttng_enabler_type type;
 305
 306         struct list_head node;  /* per-session list of enablers */
 307         /* head list of struct lttng_ust_filter_bytecode_node */
 308         struct list_head filter_bytecode_head;
 309
 310         struct lttng_kernel_event event_param;
 311         struct lttng_channel *chan;
 312         struct lttng_ctx *ctx;
 313         unsigned int enabled:1;
 314 };
 315
 316 struct lttng_channel_ops {
 317         struct channel *(*channel_create)(const char *name,
 318                                 struct lttng_channel *lttng_chan,
 319                                 void *buf_addr,
 320                                 size_t subbuf_size, size_t num_subbuf,
 321                                 unsigned int switch_timer_interval,
 322                                 unsigned int read_timer_interval);
 323         void (*channel_destroy)(struct channel *chan);
 324         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 325         int (*buffer_has_read_closed_stream)(struct channel *chan);
 326         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 327         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 328                              uint32_t event_id);
 329         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 330         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 331                             size_t len);
 332         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 333                                       const void *src, size_t len);
 334         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 335                              int c, size_t len);
 336         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 337                              size_t len);
 338         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 339                                        const char __user *src, size_t len);
 340         /*
 341          * packet_avail_size returns the available size in the current
 342          * packet. Note that the size returned is only a hint, since it
 343          * may change due to concurrent writes.
 344          */
 345         size_t (*packet_avail_size)(struct channel *chan);
 346         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 347         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 348         int (*is_finalized)(struct channel *chan);
 349         int (*is_disabled)(struct channel *chan);
 350         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 351                         struct lib_ring_buffer *bufb,
 352                         uint64_t *timestamp_begin);
 353         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 354                         struct lib_ring_buffer *bufb,
 355                         uint64_t *timestamp_end);
 356         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 357                         struct lib_ring_buffer *bufb,
 358                         uint64_t *events_discarded);
 359         int (*content_size) (const struct lib_ring_buffer_config *config,
 360                         struct lib_ring_buffer *bufb,
 361                         uint64_t *content_size);
 362         int (*packet_size) (const struct lib_ring_buffer_config *config,
 363                         struct lib_ring_buffer *bufb,
 364                         uint64_t *packet_size);
 365         int (*stream_id) (const struct lib_ring_buffer_config *config,
 366                         struct lib_ring_buffer *bufb,
 367                         uint64_t *stream_id);
 368         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 369                         struct lib_ring_buffer *bufb,
 370                         uint64_t *ts);
 371         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 372                         struct lib_ring_buffer *bufb,
 373                         uint64_t *seq);
 374         int (*instance_id) (const struct lib_ring_buffer_config *config,
 375                         struct lib_ring_buffer *bufb,
 376                         uint64_t *id);
 377 };
 378
 379 struct lttng_transport {
 380         char *name;
 381         struct module *owner;
 382         struct list_head node;
 383         struct lttng_channel_ops ops;
 384 };
 385
 386 struct lttng_syscall_filter;
 387
 388 #define LTTNG_EVENT_HT_BITS             12
 389 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 390
 391 struct lttng_event_ht {
 392         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 393 };
 394
 395 struct lttng_channel {
 396         unsigned int id;
 397         struct channel *chan;           /* Channel buffers */
 398         int enabled;
 399         struct lttng_ctx *ctx;
 400         /* Event ID management */
 401         struct lttng_session *session;
 402         struct file *file;              /* File associated to channel */
 403         unsigned int free_event_id;     /* Next event ID to allocate */
 404         struct list_head list;          /* Channel list */
 405         struct lttng_channel_ops *ops;
 406         struct lttng_transport *transport;
 407         struct lttng_event **sc_table;  /* for syscall tracing */
 408         struct lttng_event **compat_sc_table;
 409         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 410         struct lttng_event **compat_sc_exit_table;
 411         struct lttng_event *sc_unknown; /* for unknown syscalls */
 412         struct lttng_event *sc_compat_unknown;
 413         struct lttng_event *sc_exit_unknown;
 414         struct lttng_event *compat_sc_exit_unknown;
 415         struct lttng_syscall_filter *sc_filter;
 416         int header_type;                /* 0: unset, 1: compact, 2: large */
 417         enum channel_type channel_type;
 418         unsigned int metadata_dumped:1,
 419                 sys_enter_registered:1,
 420                 sys_exit_registered:1,
 421                 syscall_all:1,
 422                 tstate:1;               /* Transient enable state */
 423 };
 424
 425 struct lttng_metadata_stream {
 426         void *priv;                     /* Ring buffer private data */
 427         struct lttng_metadata_cache *metadata_cache;
 428         unsigned int metadata_in;       /* Bytes read from the cache */
 429         unsigned int metadata_out;      /* Bytes consumed from stream */
 430         int finalized;                  /* Has channel been finalized */
 431         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 432         struct list_head list;          /* Stream list */
 433         struct lttng_transport *transport;
 434         uint64_t version;               /* Current version of the metadata cache */
 435 };
 436
 437
 438 /*
 439  * struct lttng_pid_tracker declared in header due to deferencing of *v
 440  * in RCU_INITIALIZER(v).
 441  */
 442 #define LTTNG_PID_HASH_BITS     6
 443 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 444
 445 struct lttng_pid_tracker {
 446         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 447 };
 448
 449 struct lttng_pid_hash_node {
 450         struct hlist_node hlist;
 451         int pid;
 452 };
 453
 454 struct lttng_session {
 455         int active;                     /* Is trace session active ? */
 456         int been_active;                /* Has trace session been active ? */
 457         struct file *file;              /* File associated to session */
 458         struct list_head chan;          /* Channel list head */
 459         struct list_head events;        /* Event list head */
 460         struct list_head list;          /* Session list */
 461         unsigned int free_chan_id;      /* Next chan ID to allocate */
 462         uuid_le uuid;                   /* Trace session unique ID */
 463         struct lttng_metadata_cache *metadata_cache;
 464         struct lttng_pid_tracker *pid_tracker;
 465         unsigned int metadata_dumped:1,
 466                 tstate:1;               /* Transient enable state */
 467         /* List of enablers */
 468         struct list_head enablers_head;
 469         /* Hash table of events */
 470         struct lttng_event_ht events_ht;
 471 };
 472
 473 struct lttng_metadata_cache {
 474         char *data;                     /* Metadata cache */
 475         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 476         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 477         struct kref refcount;           /* Metadata cache usage */
 478         struct list_head metadata_stream;       /* Metadata stream list */
 479         uuid_le uuid;                   /* Trace session unique ID (copy) */
 480         struct mutex lock;              /* Produce/consume lock */
 481         uint64_t version;               /* Current version of the metadata */
 482 };
 483
 484 void lttng_lock_sessions(void);
 485 void lttng_unlock_sessions(void);
 486
 487 struct list_head *lttng_get_probe_list_head(void);
 488
 489 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 490                 struct lttng_kernel_event *event_param,
 491                 struct lttng_channel *chan);
 492
 493 int lttng_enabler_enable(struct lttng_enabler *enabler);
 494 int lttng_enabler_disable(struct lttng_enabler *enabler);
 495 int lttng_fix_pending_events(void);
 496 int lttng_session_active(void);
 497
 498 struct lttng_session *lttng_session_create(void);
 499 int lttng_session_enable(struct lttng_session *session);
 500 int lttng_session_disable(struct lttng_session *session);
 501 void lttng_session_destroy(struct lttng_session *session);
 502 int lttng_session_metadata_regenerate(struct lttng_session *session);
 503 void metadata_cache_destroy(struct kref *kref);
 504
 505 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 506                                        const char *transport_name,
 507                                        void *buf_addr,
 508                                        size_t subbuf_size, size_t num_subbuf,
 509                                        unsigned int switch_timer_interval,
 510                                        unsigned int read_timer_interval,
 511                                        enum channel_type channel_type);
 512 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 513                                        int overwrite, void *buf_addr,
 514                                        size_t subbuf_size, size_t num_subbuf,
 515                                        unsigned int switch_timer_interval,
 516                                        unsigned int read_timer_interval);
 517
 518 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 519 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 520                                 struct lttng_kernel_event *event_param,
 521                                 void *filter,
 522                                 const struct lttng_event_desc *event_desc,
 523                                 enum lttng_kernel_instrumentation itype);
 524 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 525                                 struct lttng_kernel_event *event_param,
 526                                 void *filter,
 527                                 const struct lttng_event_desc *event_desc,
 528                                 enum lttng_kernel_instrumentation itype);
 529 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 530                 struct lttng_kernel_old_event *old_event_param,
 531                 void *filter,
 532                 const struct lttng_event_desc *internal_desc);
 533
 534 int lttng_channel_enable(struct lttng_channel *channel);
 535 int lttng_channel_disable(struct lttng_channel *channel);
 536 int lttng_event_enable(struct lttng_event *event);
 537 int lttng_event_disable(struct lttng_event *event);
 538
 539 void lttng_transport_register(struct lttng_transport *transport);
 540 void lttng_transport_unregister(struct lttng_transport *transport);
 541
 542 void synchronize_trace(void);
 543 int lttng_abi_init(void);
 544 int lttng_abi_compat_old_init(void);
 545 void lttng_abi_exit(void);
 546 void lttng_abi_compat_old_exit(void);
 547
 548 int lttng_probe_register(struct lttng_probe_desc *desc);
 549 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 550 const struct lttng_event_desc *lttng_event_get(const char *name);
 551 void lttng_event_put(const struct lttng_event_desc *desc);
 552 int lttng_probes_init(void);
 553 void lttng_probes_exit(void);
 554
 555 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 556                 struct channel *chan);
 557
 558 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 559 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 560 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 561 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 562 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 563 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 564
 565 int lttng_session_track_pid(struct lttng_session *session, int pid);
 566 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 567
 568 int lttng_session_list_tracker_pids(struct lttng_session *session);
 569
 570 void lttng_clock_ref(void);
 571 void lttng_clock_unref(void);
 572
 573 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 574 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 575 int lttng_syscalls_unregister(struct lttng_channel *chan);
 576 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 577                 const char *name);
 578 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 579                 const char *name);
 580 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 581                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 582 #else
 583 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 584 {
 585         return -ENOSYS;
 586 }
 587
 588 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 589 {
 590         return 0;
 591 }
 592
 593 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 594                 const char *name)
 595 {
 596         return -ENOSYS;
 597 }
 598
 599 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 600                 const char *name)
 601 {
 602         return -ENOSYS;
 603 }
 604
 605 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 606                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 607 {
 608         return -ENOSYS;
 609 }
 610 #endif
 611
 612 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 613 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 614                 struct lttng_kernel_filter_bytecode __user *bytecode);
 615 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 616                 struct lttng_enabler *enabler);
 617
 618 extern struct lttng_ctx *lttng_static_ctx;
 619
 620 int lttng_context_init(void);
 621 void lttng_context_exit(void);
 622 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 623 void lttng_context_update(struct lttng_ctx *ctx);
 624 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 625 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 626 void lttng_remove_context_field(struct lttng_ctx **ctx,
 627                                 struct lttng_ctx_field *field);
 628 void lttng_destroy_context(struct lttng_ctx *ctx);
 629 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 630 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 631 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 632 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 633 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 634 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 635 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 636 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 637 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 638 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 639 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 640 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 641 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 642 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 643 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 644 #else
 645 static inline
 646 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 647 {
 648         return -ENOSYS;
 649 }
 650 #endif
 651 #ifdef CONFIG_PREEMPT_RT_FULL
 652 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 653 #else
 654 static inline
 655 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 656 {
 657         return -ENOSYS;
 658 }
 659 #endif
 660 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 661 int lttng_add_perf_counter_to_ctx(uint32_t type,
 662                                   uint64_t config,
 663                                   const char *name,
 664                                   struct lttng_ctx **ctx);
 665 #else
 666 static inline
 667 int lttng_add_perf_counter_to_ctx(uint32_t type,
 668                                   uint64_t config,
 669                                   const char *name,
 670                                   struct lttng_ctx **ctx)
 671 {
 672         return -ENOSYS;
 673 }
 674 #endif
 675
 676 int lttng_logger_init(void);
 677 void lttng_logger_exit(void);
 678
 679 extern int lttng_statedump_start(struct lttng_session *session);
 680
 681 #ifdef CONFIG_KPROBES
 682 int lttng_kprobes_register(const char *name,
 683                 const char *symbol_name,
 684                 uint64_t offset,
 685                 uint64_t addr,
 686                 struct lttng_event *event);
 687 void lttng_kprobes_unregister(struct lttng_event *event);
 688 void lttng_kprobes_destroy_private(struct lttng_event *event);
 689 #else
 690 static inline
 691 int lttng_kprobes_register(const char *name,
 692                 const char *symbol_name,
 693                 uint64_t offset,
 694                 uint64_t addr,
 695                 struct lttng_event *event)
 696 {
 697         return -ENOSYS;
 698 }
 699
 700 static inline
 701 void lttng_kprobes_unregister(struct lttng_event *event)
 702 {
 703 }
 704
 705 static inline
 706 void lttng_kprobes_destroy_private(struct lttng_event *event)
 707 {
 708 }
 709 #endif
 710
 711 #ifdef CONFIG_KRETPROBES
 712 int lttng_kretprobes_register(const char *name,
 713                 const char *symbol_name,
 714                 uint64_t offset,
 715                 uint64_t addr,
 716                 struct lttng_event *event_entry,
 717                 struct lttng_event *event_exit);
 718 void lttng_kretprobes_unregister(struct lttng_event *event);
 719 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 720 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 721         int enable);
 722 #else
 723 static inline
 724 int lttng_kretprobes_register(const char *name,
 725                 const char *symbol_name,
 726                 uint64_t offset,
 727                 uint64_t addr,
 728                 struct lttng_event *event_entry,
 729                 struct lttng_event *event_exit)
 730 {
 731         return -ENOSYS;
 732 }
 733
 734 static inline
 735 void lttng_kretprobes_unregister(struct lttng_event *event)
 736 {
 737 }
 738
 739 static inline
 740 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 741 {
 742 }
 743
 744 static inline
 745 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 746         int enable)
 747 {
 748         return -ENOSYS;
 749 }
 750 #endif
 751
 752 #ifdef CONFIG_DYNAMIC_FTRACE
 753 int lttng_ftrace_register(const char *name,
 754                           const char *symbol_name,
 755                           struct lttng_event *event);
 756 void lttng_ftrace_unregister(struct lttng_event *event);
 757 void lttng_ftrace_destroy_private(struct lttng_event *event);
 758 #else
 759 static inline
 760 int lttng_ftrace_register(const char *name,
 761                           const char *symbol_name,
 762                           struct lttng_event *event)
 763 {
 764         return -ENOSYS;
 765 }
 766
 767 static inline
 768 void lttng_ftrace_unregister(struct lttng_event *event)
 769 {
 770 }
 771
 772 static inline
 773 void lttng_ftrace_destroy_private(struct lttng_event *event)
 774 {
 775 }
 776 #endif
 777
 778 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 779
 780 extern const struct file_operations lttng_tracepoint_list_fops;
 781 extern const struct file_operations lttng_syscall_list_fops;
 782
 783 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 784 #define TRACEPOINT_HAS_DATA_ARG
 785 #endif
 786
 787 #endif /* _LTTNG_EVENTS_H */