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         atype_struct,
  53         atype_array_compound,           /* Array of compound types. */
  54         atype_sequence_compound,        /* Sequence of compound types. */
  55         NR_ABSTRACT_TYPES,
  56 };
  57
  58 enum lttng_string_encodings {
  59         lttng_encode_none = 0,
  60         lttng_encode_UTF8 = 1,
  61         lttng_encode_ASCII = 2,
  62         NR_STRING_ENCODINGS,
  63 };
  64
  65 enum channel_type {
  66         PER_CPU_CHANNEL,
  67         METADATA_CHANNEL,
  68 };
  69
  70 struct lttng_enum_entry {
  71         unsigned long long start, end;  /* start and end are inclusive */
  72         const char *string;
  73 };
  74
  75 #define __type_integer(_type, _size, _alignment, _signedness,   \
  76                 _byte_order, _base, _encoding)  \
  77         {                                                       \
  78             .atype = atype_integer,                             \
  79             .u.basic.integer =                                  \
  80                 {                                               \
  81                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  82                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  83                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  84                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  85                   .base = _base,                                \
  86                   .encoding = lttng_encode_##_encoding,         \
  87                 },                                              \
  88         }                                                       \
  89
  90 struct lttng_integer_type {
  91         unsigned int size;              /* in bits */
  92         unsigned short alignment;       /* in bits */
  93         unsigned int signedness:1,
  94                 reverse_byte_order:1;
  95         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  96         enum lttng_string_encodings encoding;
  97 };
  98
  99 union _lttng_basic_type {
 100         struct lttng_integer_type integer;
 101         struct {
 102                 const char *name;
 103         } enumeration;
 104         struct {
 105                 enum lttng_string_encodings encoding;
 106         } string;
 107 };
 108
 109 struct lttng_basic_type {
 110         enum abstract_types atype;
 111         union {
 112                 union _lttng_basic_type basic;
 113         } u;
 114 };
 115
 116 struct lttng_type {
 117         enum abstract_types atype;
 118         union {
 119                 union _lttng_basic_type basic;
 120                 struct {
 121                         struct lttng_basic_type elem_type;
 122                         unsigned int length;            /* num. elems. */
 123                         unsigned int elem_alignment;    /* alignment override */
 124                 } array;
 125                 struct {
 126                         struct lttng_basic_type length_type;
 127                         struct lttng_basic_type elem_type;
 128                         unsigned int elem_alignment;    /* alignment override */
 129                 } sequence;
 130                 struct {
 131                         uint32_t nr_fields;
 132                         struct lttng_event_field *fields; /* Array of fields. */
 133                 } _struct;
 134                 struct {
 135                         struct lttng_type *elem_type;
 136                         unsigned int length;            /* num. elems. */
 137                 } array_compound;
 138                 struct {
 139                         struct lttng_type *elem_type;
 140                         const char *length_name;
 141                 } sequence_compound;
 142         } u;
 143 };
 144
 145 struct lttng_enum {
 146         const char *name;
 147         struct lttng_type container_type;
 148         const struct lttng_enum_entry *entries;
 149         unsigned int len;
 150 };
 151
 152 /* Event field description */
 153
 154 struct lttng_event_field {
 155         const char *name;
 156         struct lttng_type type;
 157         unsigned int nowrite:1,         /* do not write into trace */
 158                         user:1;         /* fetch from user-space */
 159 };
 160
 161 union lttng_ctx_value {
 162         int64_t s64;
 163         const char *str;
 164         double d;
 165 };
 166
 167 /*
 168  * We need to keep this perf counter field separately from struct
 169  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 170  */
 171 struct lttng_perf_counter_field {
 172         struct notifier_block nb;
 173         int hp_enable;
 174         struct perf_event_attr *attr;
 175         struct perf_event **e;  /* per-cpu array */
 176 };
 177
 178 struct lttng_probe_ctx {
 179         struct lttng_event *event;
 180         uint8_t interruptible;
 181 };
 182
 183 struct lttng_ctx_field {
 184         struct lttng_event_field event_field;
 185         size_t (*get_size)(size_t offset);
 186         void (*record)(struct lttng_ctx_field *field,
 187                        struct lib_ring_buffer_ctx *ctx,
 188                        struct lttng_channel *chan);
 189         void (*get_value)(struct lttng_ctx_field *field,
 190                          struct lttng_probe_ctx *lttng_probe_ctx,
 191                          union lttng_ctx_value *value);
 192         union {
 193                 struct lttng_perf_counter_field *perf_counter;
 194         } u;
 195         void (*destroy)(struct lttng_ctx_field *field);
 196 };
 197
 198 struct lttng_ctx {
 199         struct lttng_ctx_field *fields;
 200         unsigned int nr_fields;
 201         unsigned int allocated_fields;
 202         size_t largest_align;   /* in bytes */
 203 };
 204
 205 struct lttng_event_desc {
 206         const char *name;               /* lttng-modules name */
 207         const char *kname;              /* Linux kernel name (tracepoints) */
 208         void *probe_callback;
 209         const struct lttng_event_ctx *ctx;      /* context */
 210         const struct lttng_event_field *fields; /* event payload */
 211         unsigned int nr_fields;
 212         struct module *owner;
 213 };
 214
 215 struct lttng_probe_desc {
 216         const char *provider;
 217         const struct lttng_event_desc **event_desc;
 218         unsigned int nr_events;
 219         struct list_head head;                  /* chain registered probes */
 220         struct list_head lazy_init_head;
 221         int lazy;                               /* lazy registration */
 222 };
 223
 224 struct lttng_krp;                               /* Kretprobe handling */
 225
 226 enum lttng_event_type {
 227         LTTNG_TYPE_EVENT = 0,
 228         LTTNG_TYPE_ENABLER = 1,
 229 };
 230
 231 struct lttng_filter_bytecode_node {
 232         struct list_head node;
 233         struct lttng_enabler *enabler;
 234         /*
 235          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 236          * last field.
 237          */
 238         struct lttng_kernel_filter_bytecode bc;
 239 };
 240
 241 /*
 242  * Filter return value masks.
 243  */
 244 enum lttng_filter_ret {
 245         LTTNG_FILTER_DISCARD = 0,
 246         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 247         /* Other bits are kept for future use. */
 248 };
 249
 250 struct lttng_bytecode_runtime {
 251         /* Associated bytecode */
 252         struct lttng_filter_bytecode_node *bc;
 253         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 254                         const char *filter_stack_data);
 255         int link_failed;
 256         struct list_head node;  /* list of bytecode runtime in event */
 257 };
 258
 259 /*
 260  * Objects in a linked-list of enablers, owned by an event.
 261  */
 262 struct lttng_enabler_ref {
 263         struct list_head node;                  /* enabler ref list */
 264         struct lttng_enabler *ref;              /* backward ref */
 265 };
 266
 267 /*
 268  * lttng_event structure is referred to by the tracing fast path. It must be
 269  * kept small.
 270  */
 271 struct lttng_event {
 272         enum lttng_event_type evtype;   /* First field. */
 273         unsigned int id;
 274         struct lttng_channel *chan;
 275         int enabled;
 276         const struct lttng_event_desc *desc;
 277         void *filter;
 278         struct lttng_ctx *ctx;
 279         enum lttng_kernel_instrumentation instrumentation;
 280         union {
 281                 struct {
 282                         struct kprobe kp;
 283                         char *symbol_name;
 284                 } kprobe;
 285                 struct {
 286                         struct lttng_krp *lttng_krp;
 287                         char *symbol_name;
 288                 } kretprobe;
 289                 struct {
 290                         char *symbol_name;
 291                 } ftrace;
 292         } u;
 293         struct list_head list;          /* Event list in session */
 294         unsigned int metadata_dumped:1;
 295
 296         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 297         struct list_head enablers_ref_head;
 298         struct hlist_node hlist;        /* session ht of events */
 299         int registered;                 /* has reg'd tracepoint probe */
 300         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 301         struct list_head bytecode_runtime_head;
 302         int has_enablers_without_bytecode;
 303 };
 304
 305 enum lttng_enabler_type {
 306         LTTNG_ENABLER_WILDCARD,
 307         LTTNG_ENABLER_NAME,
 308 };
 309
 310 /*
 311  * Enabler field, within whatever object is enabling an event. Target of
 312  * backward reference.
 313  */
 314 struct lttng_enabler {
 315         enum lttng_event_type evtype;   /* First field. */
 316
 317         enum lttng_enabler_type type;
 318
 319         struct list_head node;  /* per-session list of enablers */
 320         /* head list of struct lttng_ust_filter_bytecode_node */
 321         struct list_head filter_bytecode_head;
 322
 323         struct lttng_kernel_event event_param;
 324         struct lttng_channel *chan;
 325         struct lttng_ctx *ctx;
 326         unsigned int enabled:1;
 327 };
 328
 329 struct lttng_channel_ops {
 330         struct channel *(*channel_create)(const char *name,
 331                                 struct lttng_channel *lttng_chan,
 332                                 void *buf_addr,
 333                                 size_t subbuf_size, size_t num_subbuf,
 334                                 unsigned int switch_timer_interval,
 335                                 unsigned int read_timer_interval);
 336         void (*channel_destroy)(struct channel *chan);
 337         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 338         int (*buffer_has_read_closed_stream)(struct channel *chan);
 339         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 340         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 341                              uint32_t event_id);
 342         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 343         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 344                             size_t len);
 345         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 346                                       const void *src, size_t len);
 347         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 348                              int c, size_t len);
 349         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 350                              size_t len);
 351         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 352                                        const char __user *src, size_t len);
 353         /*
 354          * packet_avail_size returns the available size in the current
 355          * packet. Note that the size returned is only a hint, since it
 356          * may change due to concurrent writes.
 357          */
 358         size_t (*packet_avail_size)(struct channel *chan);
 359         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 360         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 361         int (*is_finalized)(struct channel *chan);
 362         int (*is_disabled)(struct channel *chan);
 363         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 364                         struct lib_ring_buffer *bufb,
 365                         uint64_t *timestamp_begin);
 366         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 367                         struct lib_ring_buffer *bufb,
 368                         uint64_t *timestamp_end);
 369         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 370                         struct lib_ring_buffer *bufb,
 371                         uint64_t *events_discarded);
 372         int (*content_size) (const struct lib_ring_buffer_config *config,
 373                         struct lib_ring_buffer *bufb,
 374                         uint64_t *content_size);
 375         int (*packet_size) (const struct lib_ring_buffer_config *config,
 376                         struct lib_ring_buffer *bufb,
 377                         uint64_t *packet_size);
 378         int (*stream_id) (const struct lib_ring_buffer_config *config,
 379                         struct lib_ring_buffer *bufb,
 380                         uint64_t *stream_id);
 381         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 382                         struct lib_ring_buffer *bufb,
 383                         uint64_t *ts);
 384         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 385                         struct lib_ring_buffer *bufb,
 386                         uint64_t *seq);
 387         int (*instance_id) (const struct lib_ring_buffer_config *config,
 388                         struct lib_ring_buffer *bufb,
 389                         uint64_t *id);
 390 };
 391
 392 struct lttng_transport {
 393         char *name;
 394         struct module *owner;
 395         struct list_head node;
 396         struct lttng_channel_ops ops;
 397 };
 398
 399 struct lttng_syscall_filter;
 400
 401 #define LTTNG_EVENT_HT_BITS             12
 402 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 403
 404 struct lttng_event_ht {
 405         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 406 };
 407
 408 struct lttng_channel {
 409         unsigned int id;
 410         struct channel *chan;           /* Channel buffers */
 411         int enabled;
 412         struct lttng_ctx *ctx;
 413         /* Event ID management */
 414         struct lttng_session *session;
 415         struct file *file;              /* File associated to channel */
 416         unsigned int free_event_id;     /* Next event ID to allocate */
 417         struct list_head list;          /* Channel list */
 418         struct lttng_channel_ops *ops;
 419         struct lttng_transport *transport;
 420         struct lttng_event **sc_table;  /* for syscall tracing */
 421         struct lttng_event **compat_sc_table;
 422         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 423         struct lttng_event **compat_sc_exit_table;
 424         struct lttng_event *sc_unknown; /* for unknown syscalls */
 425         struct lttng_event *sc_compat_unknown;
 426         struct lttng_event *sc_exit_unknown;
 427         struct lttng_event *compat_sc_exit_unknown;
 428         struct lttng_syscall_filter *sc_filter;
 429         int header_type;                /* 0: unset, 1: compact, 2: large */
 430         enum channel_type channel_type;
 431         unsigned int metadata_dumped:1,
 432                 sys_enter_registered:1,
 433                 sys_exit_registered:1,
 434                 syscall_all:1,
 435                 tstate:1;               /* Transient enable state */
 436 };
 437
 438 struct lttng_metadata_stream {
 439         void *priv;                     /* Ring buffer private data */
 440         struct lttng_metadata_cache *metadata_cache;
 441         unsigned int metadata_in;       /* Bytes read from the cache */
 442         unsigned int metadata_out;      /* Bytes consumed from stream */
 443         int finalized;                  /* Has channel been finalized */
 444         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 445         struct list_head list;          /* Stream list */
 446         struct lttng_transport *transport;
 447         uint64_t version;               /* Current version of the metadata cache */
 448 };
 449
 450
 451 /*
 452  * struct lttng_pid_tracker declared in header due to deferencing of *v
 453  * in RCU_INITIALIZER(v).
 454  */
 455 #define LTTNG_PID_HASH_BITS     6
 456 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 457
 458 struct lttng_pid_tracker {
 459         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 460 };
 461
 462 struct lttng_pid_hash_node {
 463         struct hlist_node hlist;
 464         int pid;
 465 };
 466
 467 struct lttng_session {
 468         int active;                     /* Is trace session active ? */
 469         int been_active;                /* Has trace session been active ? */
 470         struct file *file;              /* File associated to session */
 471         struct list_head chan;          /* Channel list head */
 472         struct list_head events;        /* Event list head */
 473         struct list_head list;          /* Session list */
 474         unsigned int free_chan_id;      /* Next chan ID to allocate */
 475         uuid_le uuid;                   /* Trace session unique ID */
 476         struct lttng_metadata_cache *metadata_cache;
 477         struct lttng_pid_tracker *pid_tracker;
 478         unsigned int metadata_dumped:1,
 479                 tstate:1;               /* Transient enable state */
 480         /* List of enablers */
 481         struct list_head enablers_head;
 482         /* Hash table of events */
 483         struct lttng_event_ht events_ht;
 484 };
 485
 486 struct lttng_metadata_cache {
 487         char *data;                     /* Metadata cache */
 488         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 489         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 490         struct kref refcount;           /* Metadata cache usage */
 491         struct list_head metadata_stream;       /* Metadata stream list */
 492         uuid_le uuid;                   /* Trace session unique ID (copy) */
 493         struct mutex lock;              /* Produce/consume lock */
 494         uint64_t version;               /* Current version of the metadata */
 495 };
 496
 497 void lttng_lock_sessions(void);
 498 void lttng_unlock_sessions(void);
 499
 500 struct list_head *lttng_get_probe_list_head(void);
 501
 502 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 503                 struct lttng_kernel_event *event_param,
 504                 struct lttng_channel *chan);
 505
 506 int lttng_enabler_enable(struct lttng_enabler *enabler);
 507 int lttng_enabler_disable(struct lttng_enabler *enabler);
 508 int lttng_fix_pending_events(void);
 509 int lttng_session_active(void);
 510
 511 struct lttng_session *lttng_session_create(void);
 512 int lttng_session_enable(struct lttng_session *session);
 513 int lttng_session_disable(struct lttng_session *session);
 514 void lttng_session_destroy(struct lttng_session *session);
 515 int lttng_session_metadata_regenerate(struct lttng_session *session);
 516 void metadata_cache_destroy(struct kref *kref);
 517
 518 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 519                                        const char *transport_name,
 520                                        void *buf_addr,
 521                                        size_t subbuf_size, size_t num_subbuf,
 522                                        unsigned int switch_timer_interval,
 523                                        unsigned int read_timer_interval,
 524                                        enum channel_type channel_type);
 525 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 526                                        int overwrite, void *buf_addr,
 527                                        size_t subbuf_size, size_t num_subbuf,
 528                                        unsigned int switch_timer_interval,
 529                                        unsigned int read_timer_interval);
 530
 531 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 532 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 533                                 struct lttng_kernel_event *event_param,
 534                                 void *filter,
 535                                 const struct lttng_event_desc *event_desc,
 536                                 enum lttng_kernel_instrumentation itype);
 537 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 538                                 struct lttng_kernel_event *event_param,
 539                                 void *filter,
 540                                 const struct lttng_event_desc *event_desc,
 541                                 enum lttng_kernel_instrumentation itype);
 542 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 543                 struct lttng_kernel_old_event *old_event_param,
 544                 void *filter,
 545                 const struct lttng_event_desc *internal_desc);
 546
 547 int lttng_channel_enable(struct lttng_channel *channel);
 548 int lttng_channel_disable(struct lttng_channel *channel);
 549 int lttng_event_enable(struct lttng_event *event);
 550 int lttng_event_disable(struct lttng_event *event);
 551
 552 void lttng_transport_register(struct lttng_transport *transport);
 553 void lttng_transport_unregister(struct lttng_transport *transport);
 554
 555 void synchronize_trace(void);
 556 int lttng_abi_init(void);
 557 int lttng_abi_compat_old_init(void);
 558 void lttng_abi_exit(void);
 559 void lttng_abi_compat_old_exit(void);
 560
 561 int lttng_probe_register(struct lttng_probe_desc *desc);
 562 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 563 const struct lttng_event_desc *lttng_event_get(const char *name);
 564 void lttng_event_put(const struct lttng_event_desc *desc);
 565 int lttng_probes_init(void);
 566 void lttng_probes_exit(void);
 567
 568 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 569                 struct channel *chan);
 570
 571 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 572 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 573 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 574 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 575 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 576 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 577
 578 int lttng_session_track_pid(struct lttng_session *session, int pid);
 579 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 580
 581 int lttng_session_list_tracker_pids(struct lttng_session *session);
 582
 583 void lttng_clock_ref(void);
 584 void lttng_clock_unref(void);
 585
 586 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 587 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 588 int lttng_syscalls_unregister(struct lttng_channel *chan);
 589 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 590                 const char *name);
 591 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 592                 const char *name);
 593 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 594                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 595 #else
 596 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 597 {
 598         return -ENOSYS;
 599 }
 600
 601 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 602 {
 603         return 0;
 604 }
 605
 606 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 607                 const char *name)
 608 {
 609         return -ENOSYS;
 610 }
 611
 612 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 613                 const char *name)
 614 {
 615         return -ENOSYS;
 616 }
 617
 618 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 619                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 620 {
 621         return -ENOSYS;
 622 }
 623 #endif
 624
 625 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 626 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 627                 struct lttng_kernel_filter_bytecode __user *bytecode);
 628 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 629                 struct lttng_enabler *enabler);
 630
 631 extern struct lttng_ctx *lttng_static_ctx;
 632
 633 int lttng_context_init(void);
 634 void lttng_context_exit(void);
 635 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 636 void lttng_context_update(struct lttng_ctx *ctx);
 637 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 638 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 639 void lttng_remove_context_field(struct lttng_ctx **ctx,
 640                                 struct lttng_ctx_field *field);
 641 void lttng_destroy_context(struct lttng_ctx *ctx);
 642 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 643 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 644 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 645 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 646 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 647 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 648 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 649 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 650 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 651 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 652 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 653 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 654 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 655 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 656 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 657 #else
 658 static inline
 659 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 660 {
 661         return -ENOSYS;
 662 }
 663 #endif
 664 #ifdef CONFIG_PREEMPT_RT_FULL
 665 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 666 #else
 667 static inline
 668 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 669 {
 670         return -ENOSYS;
 671 }
 672 #endif
 673 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 674 int lttng_add_perf_counter_to_ctx(uint32_t type,
 675                                   uint64_t config,
 676                                   const char *name,
 677                                   struct lttng_ctx **ctx);
 678 #else
 679 static inline
 680 int lttng_add_perf_counter_to_ctx(uint32_t type,
 681                                   uint64_t config,
 682                                   const char *name,
 683                                   struct lttng_ctx **ctx)
 684 {
 685         return -ENOSYS;
 686 }
 687 #endif
 688
 689 int lttng_logger_init(void);
 690 void lttng_logger_exit(void);
 691
 692 extern int lttng_statedump_start(struct lttng_session *session);
 693
 694 #ifdef CONFIG_KPROBES
 695 int lttng_kprobes_register(const char *name,
 696                 const char *symbol_name,
 697                 uint64_t offset,
 698                 uint64_t addr,
 699                 struct lttng_event *event);
 700 void lttng_kprobes_unregister(struct lttng_event *event);
 701 void lttng_kprobes_destroy_private(struct lttng_event *event);
 702 #else
 703 static inline
 704 int lttng_kprobes_register(const char *name,
 705                 const char *symbol_name,
 706                 uint64_t offset,
 707                 uint64_t addr,
 708                 struct lttng_event *event)
 709 {
 710         return -ENOSYS;
 711 }
 712
 713 static inline
 714 void lttng_kprobes_unregister(struct lttng_event *event)
 715 {
 716 }
 717
 718 static inline
 719 void lttng_kprobes_destroy_private(struct lttng_event *event)
 720 {
 721 }
 722 #endif
 723
 724 #ifdef CONFIG_KRETPROBES
 725 int lttng_kretprobes_register(const char *name,
 726                 const char *symbol_name,
 727                 uint64_t offset,
 728                 uint64_t addr,
 729                 struct lttng_event *event_entry,
 730                 struct lttng_event *event_exit);
 731 void lttng_kretprobes_unregister(struct lttng_event *event);
 732 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 733 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 734         int enable);
 735 #else
 736 static inline
 737 int lttng_kretprobes_register(const char *name,
 738                 const char *symbol_name,
 739                 uint64_t offset,
 740                 uint64_t addr,
 741                 struct lttng_event *event_entry,
 742                 struct lttng_event *event_exit)
 743 {
 744         return -ENOSYS;
 745 }
 746
 747 static inline
 748 void lttng_kretprobes_unregister(struct lttng_event *event)
 749 {
 750 }
 751
 752 static inline
 753 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 754 {
 755 }
 756
 757 static inline
 758 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 759         int enable)
 760 {
 761         return -ENOSYS;
 762 }
 763 #endif
 764
 765 #ifdef CONFIG_DYNAMIC_FTRACE
 766 int lttng_ftrace_register(const char *name,
 767                           const char *symbol_name,
 768                           struct lttng_event *event);
 769 void lttng_ftrace_unregister(struct lttng_event *event);
 770 void lttng_ftrace_destroy_private(struct lttng_event *event);
 771 #else
 772 static inline
 773 int lttng_ftrace_register(const char *name,
 774                           const char *symbol_name,
 775                           struct lttng_event *event)
 776 {
 777         return -ENOSYS;
 778 }
 779
 780 static inline
 781 void lttng_ftrace_unregister(struct lttng_event *event)
 782 {
 783 }
 784
 785 static inline
 786 void lttng_ftrace_destroy_private(struct lttng_event *event)
 787 {
 788 }
 789 #endif
 790
 791 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 792
 793 extern const struct file_operations lttng_tracepoint_list_fops;
 794 extern const struct file_operations lttng_syscall_list_fops;
 795
 796 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 797 #define TRACEPOINT_HAS_DATA_ARG
 798 #endif
 799
 800 #endif /* _LTTNG_EVENTS_H */