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-tracer.h>
  32 #include <lttng-abi.h>
  33 #include <lttng-abi-old.h>
  34
  35 #define lttng_is_signed_type(type)      (((type)(-1)) < 0)
  36
  37 struct lttng_channel;
  38 struct lttng_session;
  39 struct lttng_metadata_cache;
  40 struct lib_ring_buffer_ctx;
  41 struct perf_event;
  42 struct perf_event_attr;
  43 struct lib_ring_buffer_config;
  44
  45 /* Type description */
  46
  47 enum abstract_types {
  48         atype_integer,
  49         atype_enum,
  50         atype_array,
  51         atype_sequence,
  52         atype_string,
  53         atype_struct,
  54         atype_array_compound,           /* Array of compound types. */
  55         atype_sequence_compound,        /* Sequence of compound types. */
  56         atype_variant,
  57         NR_ABSTRACT_TYPES,
  58 };
  59
  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_value {
  73         unsigned long long value;
  74         unsigned int signedness:1;
  75 };
  76
  77 struct lttng_enum_entry {
  78         struct lttng_enum_value start, end;     /* start and end are inclusive */
  79         const char *string;
  80         struct {
  81                 unsigned int is_auto:1;
  82         } options;
  83 };
  84
  85 #define __type_integer(_type, _size, _alignment, _signedness,   \
  86                 _byte_order, _base, _encoding)  \
  87         {                                                       \
  88             .atype = atype_integer,                             \
  89             .u.basic.integer =                                  \
  90                 {                                               \
  91                   .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
  92                   .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
  93                   .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
  94                   .reverse_byte_order = _byte_order != __BYTE_ORDER, \
  95                   .base = _base,                                \
  96                   .encoding = lttng_encode_##_encoding,         \
  97                 },                                              \
  98         }                                                       \
  99
 100 struct lttng_integer_type {
 101         unsigned int size;              /* in bits */
 102         unsigned short alignment;       /* in bits */
 103         unsigned int signedness:1,
 104                 reverse_byte_order:1;
 105         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
 106         enum lttng_string_encodings encoding;
 107 };
 108
 109 union _lttng_basic_type {
 110         struct lttng_integer_type integer;
 111         struct {
 112                 const struct lttng_enum_desc *desc;     /* Enumeration mapping */
 113                 struct lttng_integer_type container_type;
 114         } enumeration;
 115         struct {
 116                 enum lttng_string_encodings encoding;
 117         } string;
 118 };
 119
 120 struct lttng_basic_type {
 121         enum abstract_types atype;
 122         union {
 123                 union _lttng_basic_type basic;
 124         } u;
 125 };
 126
 127 struct lttng_type {
 128         enum abstract_types atype;
 129         union {
 130                 union _lttng_basic_type basic;
 131                 struct {
 132                         struct lttng_basic_type elem_type;
 133                         unsigned int length;            /* num. elems. */
 134                         unsigned int elem_alignment;    /* alignment override */
 135                 } array;
 136                 struct {
 137                         struct lttng_basic_type length_type;
 138                         struct lttng_basic_type elem_type;
 139                         unsigned int elem_alignment;    /* alignment override */
 140                 } sequence;
 141                 struct {
 142                         uint32_t nr_fields;
 143                         struct lttng_event_field *fields; /* Array of fields. */
 144                 } _struct;
 145                 struct {
 146                         struct lttng_type *elem_type;
 147                         unsigned int length;            /* num. elems. */
 148                 } array_compound;
 149                 struct {
 150                         struct lttng_type *elem_type;
 151                         const char *length_name;
 152                 } sequence_compound;
 153                 struct {
 154                         const char *tag_name;
 155                         struct lttng_event_field *choices; /* Array of fields. */
 156                         uint32_t nr_choices;
 157                 } variant;
 158         } u;
 159 };
 160
 161 struct lttng_enum_desc {
 162         const char *name;
 163         const struct lttng_enum_entry *entries;
 164         unsigned int nr_entries;
 165 };
 166
 167 /* Event field description */
 168
 169 struct lttng_event_field {
 170         const char *name;
 171         struct lttng_type type;
 172         unsigned int nowrite:1,         /* do not write into trace */
 173                         user:1;         /* fetch from user-space */
 174 };
 175
 176 union lttng_ctx_value {
 177         int64_t s64;
 178         const char *str;
 179         double d;
 180 };
 181
 182 /*
 183  * We need to keep this perf counter field separately from struct
 184  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 185  */
 186 struct lttng_perf_counter_field {
 187         struct notifier_block nb;
 188         int hp_enable;
 189         struct perf_event_attr *attr;
 190         struct perf_event **e;  /* per-cpu array */
 191 };
 192
 193 struct lttng_probe_ctx {
 194         struct lttng_event *event;
 195         uint8_t interruptible;
 196 };
 197
 198 struct lttng_ctx_field {
 199         struct lttng_event_field event_field;
 200         size_t (*get_size)(size_t offset);
 201         void (*record)(struct lttng_ctx_field *field,
 202                        struct lib_ring_buffer_ctx *ctx,
 203                        struct lttng_channel *chan);
 204         void (*get_value)(struct lttng_ctx_field *field,
 205                          struct lttng_probe_ctx *lttng_probe_ctx,
 206                          union lttng_ctx_value *value);
 207         union {
 208                 struct lttng_perf_counter_field *perf_counter;
 209         } u;
 210         void (*destroy)(struct lttng_ctx_field *field);
 211 };
 212
 213 struct lttng_ctx {
 214         struct lttng_ctx_field *fields;
 215         unsigned int nr_fields;
 216         unsigned int allocated_fields;
 217         size_t largest_align;   /* in bytes */
 218 };
 219
 220 struct lttng_event_desc {
 221         const char *name;               /* lttng-modules name */
 222         const char *kname;              /* Linux kernel name (tracepoints) */
 223         void *probe_callback;
 224         const struct lttng_event_ctx *ctx;      /* context */
 225         const struct lttng_event_field *fields; /* event payload */
 226         unsigned int nr_fields;
 227         struct module *owner;
 228 };
 229
 230 struct lttng_probe_desc {
 231         const char *provider;
 232         const struct lttng_event_desc **event_desc;
 233         unsigned int nr_events;
 234         struct list_head head;                  /* chain registered probes */
 235         struct list_head lazy_init_head;
 236         int lazy;                               /* lazy registration */
 237 };
 238
 239 struct lttng_krp;                               /* Kretprobe handling */
 240
 241 enum lttng_event_type {
 242         LTTNG_TYPE_EVENT = 0,
 243         LTTNG_TYPE_ENABLER = 1,
 244 };
 245
 246 struct lttng_filter_bytecode_node {
 247         struct list_head node;
 248         struct lttng_enabler *enabler;
 249         /*
 250          * struct lttng_kernel_filter_bytecode has var. sized array, must be
 251          * last field.
 252          */
 253         struct lttng_kernel_filter_bytecode bc;
 254 };
 255
 256 /*
 257  * Filter return value masks.
 258  */
 259 enum lttng_filter_ret {
 260         LTTNG_FILTER_DISCARD = 0,
 261         LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
 262         /* Other bits are kept for future use. */
 263 };
 264
 265 struct lttng_bytecode_runtime {
 266         /* Associated bytecode */
 267         struct lttng_filter_bytecode_node *bc;
 268         uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
 269                         const char *filter_stack_data);
 270         int link_failed;
 271         struct list_head node;  /* list of bytecode runtime in event */
 272 };
 273
 274 /*
 275  * Objects in a linked-list of enablers, owned by an event.
 276  */
 277 struct lttng_enabler_ref {
 278         struct list_head node;                  /* enabler ref list */
 279         struct lttng_enabler *ref;              /* backward ref */
 280 };
 281
 282 /*
 283  * lttng_event structure is referred to by the tracing fast path. It must be
 284  * kept small.
 285  */
 286 struct lttng_event {
 287         enum lttng_event_type evtype;   /* First field. */
 288         unsigned int id;
 289         struct lttng_channel *chan;
 290         int enabled;
 291         const struct lttng_event_desc *desc;
 292         void *filter;
 293         struct lttng_ctx *ctx;
 294         enum lttng_kernel_instrumentation instrumentation;
 295         union {
 296                 struct {
 297                         struct kprobe kp;
 298                         char *symbol_name;
 299                 } kprobe;
 300                 struct {
 301                         struct lttng_krp *lttng_krp;
 302                         char *symbol_name;
 303                 } kretprobe;
 304                 struct {
 305                         char *symbol_name;
 306                 } ftrace;
 307         } u;
 308         struct list_head list;          /* Event list in session */
 309         unsigned int metadata_dumped:1;
 310
 311         /* Backward references: list of lttng_enabler_ref (ref to enablers) */
 312         struct list_head enablers_ref_head;
 313         struct hlist_node hlist;        /* session ht of events */
 314         int registered;                 /* has reg'd tracepoint probe */
 315         /* list of struct lttng_bytecode_runtime, sorted by seqnum */
 316         struct list_head bytecode_runtime_head;
 317         int has_enablers_without_bytecode;
 318 };
 319
 320 enum lttng_enabler_type {
 321         LTTNG_ENABLER_WILDCARD,
 322         LTTNG_ENABLER_NAME,
 323 };
 324
 325 /*
 326  * Enabler field, within whatever object is enabling an event. Target of
 327  * backward reference.
 328  */
 329 struct lttng_enabler {
 330         enum lttng_event_type evtype;   /* First field. */
 331
 332         enum lttng_enabler_type type;
 333
 334         struct list_head node;  /* per-session list of enablers */
 335         /* head list of struct lttng_ust_filter_bytecode_node */
 336         struct list_head filter_bytecode_head;
 337
 338         struct lttng_kernel_event event_param;
 339         struct lttng_channel *chan;
 340         struct lttng_ctx *ctx;
 341         unsigned int enabled:1;
 342 };
 343
 344 struct lttng_channel_ops {
 345         struct channel *(*channel_create)(const char *name,
 346                                 struct lttng_channel *lttng_chan,
 347                                 void *buf_addr,
 348                                 size_t subbuf_size, size_t num_subbuf,
 349                                 unsigned int switch_timer_interval,
 350                                 unsigned int read_timer_interval);
 351         void (*channel_destroy)(struct channel *chan);
 352         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 353         int (*buffer_has_read_closed_stream)(struct channel *chan);
 354         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 355         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 356                              uint32_t event_id);
 357         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 358         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 359                             size_t len);
 360         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 361                                       const void *src, size_t len);
 362         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 363                              int c, size_t len);
 364         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 365                              size_t len);
 366         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 367                                        const char __user *src, size_t len);
 368         /*
 369          * packet_avail_size returns the available size in the current
 370          * packet. Note that the size returned is only a hint, since it
 371          * may change due to concurrent writes.
 372          */
 373         size_t (*packet_avail_size)(struct channel *chan);
 374         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 375         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 376         int (*is_finalized)(struct channel *chan);
 377         int (*is_disabled)(struct channel *chan);
 378         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 379                         struct lib_ring_buffer *bufb,
 380                         uint64_t *timestamp_begin);
 381         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 382                         struct lib_ring_buffer *bufb,
 383                         uint64_t *timestamp_end);
 384         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 385                         struct lib_ring_buffer *bufb,
 386                         uint64_t *events_discarded);
 387         int (*content_size) (const struct lib_ring_buffer_config *config,
 388                         struct lib_ring_buffer *bufb,
 389                         uint64_t *content_size);
 390         int (*packet_size) (const struct lib_ring_buffer_config *config,
 391                         struct lib_ring_buffer *bufb,
 392                         uint64_t *packet_size);
 393         int (*stream_id) (const struct lib_ring_buffer_config *config,
 394                         struct lib_ring_buffer *bufb,
 395                         uint64_t *stream_id);
 396         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 397                         struct lib_ring_buffer *bufb,
 398                         uint64_t *ts);
 399         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 400                         struct lib_ring_buffer *bufb,
 401                         uint64_t *seq);
 402         int (*instance_id) (const struct lib_ring_buffer_config *config,
 403                         struct lib_ring_buffer *bufb,
 404                         uint64_t *id);
 405 };
 406
 407 struct lttng_transport {
 408         char *name;
 409         struct module *owner;
 410         struct list_head node;
 411         struct lttng_channel_ops ops;
 412 };
 413
 414 struct lttng_syscall_filter;
 415
 416 #define LTTNG_EVENT_HT_BITS             12
 417 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 418
 419 struct lttng_event_ht {
 420         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 421 };
 422
 423 struct lttng_channel {
 424         unsigned int id;
 425         struct channel *chan;           /* Channel buffers */
 426         int enabled;
 427         struct lttng_ctx *ctx;
 428         /* Event ID management */
 429         struct lttng_session *session;
 430         struct file *file;              /* File associated to channel */
 431         unsigned int free_event_id;     /* Next event ID to allocate */
 432         struct list_head list;          /* Channel list */
 433         struct lttng_channel_ops *ops;
 434         struct lttng_transport *transport;
 435         struct lttng_event **sc_table;  /* for syscall tracing */
 436         struct lttng_event **compat_sc_table;
 437         struct lttng_event **sc_exit_table;     /* for syscall exit tracing */
 438         struct lttng_event **compat_sc_exit_table;
 439         struct lttng_event *sc_unknown; /* for unknown syscalls */
 440         struct lttng_event *sc_compat_unknown;
 441         struct lttng_event *sc_exit_unknown;
 442         struct lttng_event *compat_sc_exit_unknown;
 443         struct lttng_syscall_filter *sc_filter;
 444         int header_type;                /* 0: unset, 1: compact, 2: large */
 445         enum channel_type channel_type;
 446         unsigned int metadata_dumped:1,
 447                 sys_enter_registered:1,
 448                 sys_exit_registered:1,
 449                 syscall_all:1,
 450                 tstate:1;               /* Transient enable state */
 451 };
 452
 453 struct lttng_metadata_stream {
 454         void *priv;                     /* Ring buffer private data */
 455         struct lttng_metadata_cache *metadata_cache;
 456         unsigned int metadata_in;       /* Bytes read from the cache */
 457         unsigned int metadata_out;      /* Bytes consumed from stream */
 458         int finalized;                  /* Has channel been finalized */
 459         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 460         struct list_head list;          /* Stream list */
 461         struct lttng_transport *transport;
 462         uint64_t version;               /* Current version of the metadata cache */
 463 };
 464
 465 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 466
 467 struct lttng_dynamic_len_stack {
 468         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 469         size_t offset;
 470 };
 471
 472 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 473
 474 /*
 475  * struct lttng_pid_tracker declared in header due to deferencing of *v
 476  * in RCU_INITIALIZER(v).
 477  */
 478 #define LTTNG_PID_HASH_BITS     6
 479 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 480
 481 struct lttng_pid_tracker {
 482         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 483 };
 484
 485 struct lttng_pid_hash_node {
 486         struct hlist_node hlist;
 487         int pid;
 488 };
 489
 490 struct lttng_session {
 491         int active;                     /* Is trace session active ? */
 492         int been_active;                /* Has trace session been active ? */
 493         struct file *file;              /* File associated to session */
 494         struct list_head chan;          /* Channel list head */
 495         struct list_head events;        /* Event list head */
 496         struct list_head list;          /* Session list */
 497         unsigned int free_chan_id;      /* Next chan ID to allocate */
 498         uuid_le uuid;                   /* Trace session unique ID */
 499         struct lttng_metadata_cache *metadata_cache;
 500         struct lttng_pid_tracker *pid_tracker;
 501         unsigned int metadata_dumped:1,
 502                 tstate:1;               /* Transient enable state */
 503         /* List of enablers */
 504         struct list_head enablers_head;
 505         /* Hash table of events */
 506         struct lttng_event_ht events_ht;
 507 };
 508
 509 struct lttng_metadata_cache {
 510         char *data;                     /* Metadata cache */
 511         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 512         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 513         struct kref refcount;           /* Metadata cache usage */
 514         struct list_head metadata_stream;       /* Metadata stream list */
 515         uuid_le uuid;                   /* Trace session unique ID (copy) */
 516         struct mutex lock;              /* Produce/consume lock */
 517         uint64_t version;               /* Current version of the metadata */
 518 };
 519
 520 void lttng_lock_sessions(void);
 521 void lttng_unlock_sessions(void);
 522
 523 struct list_head *lttng_get_probe_list_head(void);
 524
 525 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 526                 struct lttng_kernel_event *event_param,
 527                 struct lttng_channel *chan);
 528
 529 int lttng_enabler_enable(struct lttng_enabler *enabler);
 530 int lttng_enabler_disable(struct lttng_enabler *enabler);
 531 int lttng_fix_pending_events(void);
 532 int lttng_session_active(void);
 533
 534 struct lttng_session *lttng_session_create(void);
 535 int lttng_session_enable(struct lttng_session *session);
 536 int lttng_session_disable(struct lttng_session *session);
 537 void lttng_session_destroy(struct lttng_session *session);
 538 int lttng_session_metadata_regenerate(struct lttng_session *session);
 539 int lttng_session_statedump(struct lttng_session *session);
 540 void metadata_cache_destroy(struct kref *kref);
 541
 542 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 543                                        const char *transport_name,
 544                                        void *buf_addr,
 545                                        size_t subbuf_size, size_t num_subbuf,
 546                                        unsigned int switch_timer_interval,
 547                                        unsigned int read_timer_interval,
 548                                        enum channel_type channel_type);
 549 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 550                                        int overwrite, void *buf_addr,
 551                                        size_t subbuf_size, size_t num_subbuf,
 552                                        unsigned int switch_timer_interval,
 553                                        unsigned int read_timer_interval);
 554
 555 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 556 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 557                                 struct lttng_kernel_event *event_param,
 558                                 void *filter,
 559                                 const struct lttng_event_desc *event_desc,
 560                                 enum lttng_kernel_instrumentation itype);
 561 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 562                                 struct lttng_kernel_event *event_param,
 563                                 void *filter,
 564                                 const struct lttng_event_desc *event_desc,
 565                                 enum lttng_kernel_instrumentation itype);
 566 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 567                 struct lttng_kernel_old_event *old_event_param,
 568                 void *filter,
 569                 const struct lttng_event_desc *internal_desc);
 570
 571 int lttng_channel_enable(struct lttng_channel *channel);
 572 int lttng_channel_disable(struct lttng_channel *channel);
 573 int lttng_event_enable(struct lttng_event *event);
 574 int lttng_event_disable(struct lttng_event *event);
 575
 576 void lttng_transport_register(struct lttng_transport *transport);
 577 void lttng_transport_unregister(struct lttng_transport *transport);
 578
 579 void synchronize_trace(void);
 580 int lttng_abi_init(void);
 581 int lttng_abi_compat_old_init(void);
 582 void lttng_abi_exit(void);
 583 void lttng_abi_compat_old_exit(void);
 584
 585 int lttng_probe_register(struct lttng_probe_desc *desc);
 586 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 587 const struct lttng_event_desc *lttng_event_get(const char *name);
 588 void lttng_event_put(const struct lttng_event_desc *desc);
 589 int lttng_probes_init(void);
 590 void lttng_probes_exit(void);
 591
 592 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 593                 struct channel *chan);
 594
 595 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 596 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 597 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 598 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 599 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 600 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 601
 602 int lttng_session_track_pid(struct lttng_session *session, int pid);
 603 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 604
 605 int lttng_session_list_tracker_pids(struct lttng_session *session);
 606
 607 void lttng_clock_ref(void);
 608 void lttng_clock_unref(void);
 609
 610 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 611 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 612 int lttng_syscalls_unregister(struct lttng_channel *chan);
 613 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 614                 const char *name);
 615 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 616                 const char *name);
 617 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 618                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 619 #else
 620 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 621 {
 622         return -ENOSYS;
 623 }
 624
 625 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 626 {
 627         return 0;
 628 }
 629
 630 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 631                 const char *name)
 632 {
 633         return -ENOSYS;
 634 }
 635
 636 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 637                 const char *name)
 638 {
 639         return -ENOSYS;
 640 }
 641
 642 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 643                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 644 {
 645         return -ENOSYS;
 646 }
 647 #endif
 648
 649 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 650 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 651                 struct lttng_kernel_filter_bytecode __user *bytecode);
 652 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 653                 struct lttng_enabler *enabler);
 654
 655 int lttng_probes_init(void);
 656
 657 extern struct lttng_ctx *lttng_static_ctx;
 658
 659 int lttng_context_init(void);
 660 void lttng_context_exit(void);
 661 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 662 void lttng_context_update(struct lttng_ctx *ctx);
 663 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 664 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 665 void lttng_remove_context_field(struct lttng_ctx **ctx,
 666                                 struct lttng_ctx_field *field);
 667 void lttng_destroy_context(struct lttng_ctx *ctx);
 668 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 669 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 670 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 671 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 672 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 673 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 674 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 675 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 676 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 677 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 678 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 679 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 680 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 681 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 682 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 683 #else
 684 static inline
 685 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 686 {
 687         return -ENOSYS;
 688 }
 689 #endif
 690 #ifdef CONFIG_PREEMPT_RT_FULL
 691 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 692 #else
 693 static inline
 694 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 695 {
 696         return -ENOSYS;
 697 }
 698 #endif
 699 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 700 int lttng_add_perf_counter_to_ctx(uint32_t type,
 701                                   uint64_t config,
 702                                   const char *name,
 703                                   struct lttng_ctx **ctx);
 704 #else
 705 static inline
 706 int lttng_add_perf_counter_to_ctx(uint32_t type,
 707                                   uint64_t config,
 708                                   const char *name,
 709                                   struct lttng_ctx **ctx)
 710 {
 711         return -ENOSYS;
 712 }
 713 #endif
 714
 715 int lttng_logger_init(void);
 716 void lttng_logger_exit(void);
 717
 718 extern int lttng_statedump_start(struct lttng_session *session);
 719
 720 #ifdef CONFIG_KPROBES
 721 int lttng_kprobes_register(const char *name,
 722                 const char *symbol_name,
 723                 uint64_t offset,
 724                 uint64_t addr,
 725                 struct lttng_event *event);
 726 void lttng_kprobes_unregister(struct lttng_event *event);
 727 void lttng_kprobes_destroy_private(struct lttng_event *event);
 728 #else
 729 static inline
 730 int lttng_kprobes_register(const char *name,
 731                 const char *symbol_name,
 732                 uint64_t offset,
 733                 uint64_t addr,
 734                 struct lttng_event *event)
 735 {
 736         return -ENOSYS;
 737 }
 738
 739 static inline
 740 void lttng_kprobes_unregister(struct lttng_event *event)
 741 {
 742 }
 743
 744 static inline
 745 void lttng_kprobes_destroy_private(struct lttng_event *event)
 746 {
 747 }
 748 #endif
 749
 750 #ifdef CONFIG_KRETPROBES
 751 int lttng_kretprobes_register(const char *name,
 752                 const char *symbol_name,
 753                 uint64_t offset,
 754                 uint64_t addr,
 755                 struct lttng_event *event_entry,
 756                 struct lttng_event *event_exit);
 757 void lttng_kretprobes_unregister(struct lttng_event *event);
 758 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 759 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 760         int enable);
 761 #else
 762 static inline
 763 int lttng_kretprobes_register(const char *name,
 764                 const char *symbol_name,
 765                 uint64_t offset,
 766                 uint64_t addr,
 767                 struct lttng_event *event_entry,
 768                 struct lttng_event *event_exit)
 769 {
 770         return -ENOSYS;
 771 }
 772
 773 static inline
 774 void lttng_kretprobes_unregister(struct lttng_event *event)
 775 {
 776 }
 777
 778 static inline
 779 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 780 {
 781 }
 782
 783 static inline
 784 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 785         int enable)
 786 {
 787         return -ENOSYS;
 788 }
 789 #endif
 790
 791 #ifdef CONFIG_DYNAMIC_FTRACE
 792 int lttng_ftrace_register(const char *name,
 793                           const char *symbol_name,
 794                           struct lttng_event *event);
 795 void lttng_ftrace_unregister(struct lttng_event *event);
 796 void lttng_ftrace_destroy_private(struct lttng_event *event);
 797 #else
 798 static inline
 799 int lttng_ftrace_register(const char *name,
 800                           const char *symbol_name,
 801                           struct lttng_event *event)
 802 {
 803         return -ENOSYS;
 804 }
 805
 806 static inline
 807 void lttng_ftrace_unregister(struct lttng_event *event)
 808 {
 809 }
 810
 811 static inline
 812 void lttng_ftrace_destroy_private(struct lttng_event *event)
 813 {
 814 }
 815 #endif
 816
 817 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 818
 819 extern const struct file_operations lttng_tracepoint_list_fops;
 820 extern const struct file_operations lttng_syscall_list_fops;
 821
 822 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 823 #define TRACEPOINT_HAS_DATA_ARG
 824 #endif
 825
 826 #endif /* _LTTNG_EVENTS_H */