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 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 451
 452 struct lttng_dynamic_len_stack {
 453         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 454         size_t offset;
 455 };
 456
 457 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 458
 459 /*
 460  * struct lttng_pid_tracker declared in header due to deferencing of *v
 461  * in RCU_INITIALIZER(v).
 462  */
 463 #define LTTNG_PID_HASH_BITS     6
 464 #define LTTNG_PID_TABLE_SIZE    (1 << LTTNG_PID_HASH_BITS)
 465
 466 struct lttng_pid_tracker {
 467         struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
 468 };
 469
 470 struct lttng_pid_hash_node {
 471         struct hlist_node hlist;
 472         int pid;
 473 };
 474
 475 struct lttng_session {
 476         int active;                     /* Is trace session active ? */
 477         int been_active;                /* Has trace session been active ? */
 478         struct file *file;              /* File associated to session */
 479         struct list_head chan;          /* Channel list head */
 480         struct list_head events;        /* Event list head */
 481         struct list_head list;          /* Session list */
 482         unsigned int free_chan_id;      /* Next chan ID to allocate */
 483         uuid_le uuid;                   /* Trace session unique ID */
 484         struct lttng_metadata_cache *metadata_cache;
 485         struct lttng_pid_tracker *pid_tracker;
 486         unsigned int metadata_dumped:1,
 487                 tstate:1;               /* Transient enable state */
 488         /* List of enablers */
 489         struct list_head enablers_head;
 490         /* Hash table of events */
 491         struct lttng_event_ht events_ht;
 492 };
 493
 494 struct lttng_metadata_cache {
 495         char *data;                     /* Metadata cache */
 496         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 497         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 498         struct kref refcount;           /* Metadata cache usage */
 499         struct list_head metadata_stream;       /* Metadata stream list */
 500         uuid_le uuid;                   /* Trace session unique ID (copy) */
 501         struct mutex lock;              /* Produce/consume lock */
 502         uint64_t version;               /* Current version of the metadata */
 503 };
 504
 505 void lttng_lock_sessions(void);
 506 void lttng_unlock_sessions(void);
 507
 508 struct list_head *lttng_get_probe_list_head(void);
 509
 510 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
 511                 struct lttng_kernel_event *event_param,
 512                 struct lttng_channel *chan);
 513
 514 int lttng_enabler_enable(struct lttng_enabler *enabler);
 515 int lttng_enabler_disable(struct lttng_enabler *enabler);
 516 int lttng_fix_pending_events(void);
 517 int lttng_session_active(void);
 518
 519 struct lttng_session *lttng_session_create(void);
 520 int lttng_session_enable(struct lttng_session *session);
 521 int lttng_session_disable(struct lttng_session *session);
 522 void lttng_session_destroy(struct lttng_session *session);
 523 int lttng_session_metadata_regenerate(struct lttng_session *session);
 524 void metadata_cache_destroy(struct kref *kref);
 525
 526 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 527                                        const char *transport_name,
 528                                        void *buf_addr,
 529                                        size_t subbuf_size, size_t num_subbuf,
 530                                        unsigned int switch_timer_interval,
 531                                        unsigned int read_timer_interval,
 532                                        enum channel_type channel_type);
 533 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 534                                        int overwrite, void *buf_addr,
 535                                        size_t subbuf_size, size_t num_subbuf,
 536                                        unsigned int switch_timer_interval,
 537                                        unsigned int read_timer_interval);
 538
 539 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 540 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 541                                 struct lttng_kernel_event *event_param,
 542                                 void *filter,
 543                                 const struct lttng_event_desc *event_desc,
 544                                 enum lttng_kernel_instrumentation itype);
 545 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
 546                                 struct lttng_kernel_event *event_param,
 547                                 void *filter,
 548                                 const struct lttng_event_desc *event_desc,
 549                                 enum lttng_kernel_instrumentation itype);
 550 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
 551                 struct lttng_kernel_old_event *old_event_param,
 552                 void *filter,
 553                 const struct lttng_event_desc *internal_desc);
 554
 555 int lttng_channel_enable(struct lttng_channel *channel);
 556 int lttng_channel_disable(struct lttng_channel *channel);
 557 int lttng_event_enable(struct lttng_event *event);
 558 int lttng_event_disable(struct lttng_event *event);
 559
 560 void lttng_transport_register(struct lttng_transport *transport);
 561 void lttng_transport_unregister(struct lttng_transport *transport);
 562
 563 void synchronize_trace(void);
 564 int lttng_abi_init(void);
 565 int lttng_abi_compat_old_init(void);
 566 void lttng_abi_exit(void);
 567 void lttng_abi_compat_old_exit(void);
 568
 569 int lttng_probe_register(struct lttng_probe_desc *desc);
 570 void lttng_probe_unregister(struct lttng_probe_desc *desc);
 571 const struct lttng_event_desc *lttng_event_get(const char *name);
 572 void lttng_event_put(const struct lttng_event_desc *desc);
 573 int lttng_probes_init(void);
 574 void lttng_probes_exit(void);
 575
 576 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 577                 struct channel *chan);
 578
 579 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
 580 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
 581 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
 582 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
 583 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
 584 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
 585
 586 int lttng_session_track_pid(struct lttng_session *session, int pid);
 587 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
 588
 589 int lttng_session_list_tracker_pids(struct lttng_session *session);
 590
 591 void lttng_clock_ref(void);
 592 void lttng_clock_unref(void);
 593
 594 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 595 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 596 int lttng_syscalls_unregister(struct lttng_channel *chan);
 597 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 598                 const char *name);
 599 int lttng_syscall_filter_disable(struct lttng_channel *chan,
 600                 const char *name);
 601 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 602                 struct lttng_kernel_syscall_mask __user *usyscall_mask);
 603 #else
 604 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 605 {
 606         return -ENOSYS;
 607 }
 608
 609 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
 610 {
 611         return 0;
 612 }
 613
 614 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
 615                 const char *name)
 616 {
 617         return -ENOSYS;
 618 }
 619
 620 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
 621                 const char *name)
 622 {
 623         return -ENOSYS;
 624 }
 625
 626 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 627                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 628 {
 629         return -ENOSYS;
 630 }
 631 #endif
 632
 633 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
 634 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
 635                 struct lttng_kernel_filter_bytecode __user *bytecode);
 636 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
 637                 struct lttng_enabler *enabler);
 638
 639 int lttng_probes_init(void);
 640
 641 extern struct lttng_ctx *lttng_static_ctx;
 642
 643 int lttng_context_init(void);
 644 void lttng_context_exit(void);
 645 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 646 void lttng_context_update(struct lttng_ctx *ctx);
 647 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 648 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 649 void lttng_remove_context_field(struct lttng_ctx **ctx,
 650                                 struct lttng_ctx_field *field);
 651 void lttng_destroy_context(struct lttng_ctx *ctx);
 652 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
 653 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
 654 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
 655 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
 656 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
 657 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
 658 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
 659 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
 660 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
 661 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
 662 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
 663 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
 664 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
 665 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
 666 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
 667 #else
 668 static inline
 669 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
 670 {
 671         return -ENOSYS;
 672 }
 673 #endif
 674 #ifdef CONFIG_PREEMPT_RT_FULL
 675 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
 676 #else
 677 static inline
 678 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
 679 {
 680         return -ENOSYS;
 681 }
 682 #endif
 683 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
 684 int lttng_add_perf_counter_to_ctx(uint32_t type,
 685                                   uint64_t config,
 686                                   const char *name,
 687                                   struct lttng_ctx **ctx);
 688 #else
 689 static inline
 690 int lttng_add_perf_counter_to_ctx(uint32_t type,
 691                                   uint64_t config,
 692                                   const char *name,
 693                                   struct lttng_ctx **ctx)
 694 {
 695         return -ENOSYS;
 696 }
 697 #endif
 698
 699 int lttng_logger_init(void);
 700 void lttng_logger_exit(void);
 701
 702 extern int lttng_statedump_start(struct lttng_session *session);
 703
 704 #ifdef CONFIG_KPROBES
 705 int lttng_kprobes_register(const char *name,
 706                 const char *symbol_name,
 707                 uint64_t offset,
 708                 uint64_t addr,
 709                 struct lttng_event *event);
 710 void lttng_kprobes_unregister(struct lttng_event *event);
 711 void lttng_kprobes_destroy_private(struct lttng_event *event);
 712 #else
 713 static inline
 714 int lttng_kprobes_register(const char *name,
 715                 const char *symbol_name,
 716                 uint64_t offset,
 717                 uint64_t addr,
 718                 struct lttng_event *event)
 719 {
 720         return -ENOSYS;
 721 }
 722
 723 static inline
 724 void lttng_kprobes_unregister(struct lttng_event *event)
 725 {
 726 }
 727
 728 static inline
 729 void lttng_kprobes_destroy_private(struct lttng_event *event)
 730 {
 731 }
 732 #endif
 733
 734 #ifdef CONFIG_KRETPROBES
 735 int lttng_kretprobes_register(const char *name,
 736                 const char *symbol_name,
 737                 uint64_t offset,
 738                 uint64_t addr,
 739                 struct lttng_event *event_entry,
 740                 struct lttng_event *event_exit);
 741 void lttng_kretprobes_unregister(struct lttng_event *event);
 742 void lttng_kretprobes_destroy_private(struct lttng_event *event);
 743 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 744         int enable);
 745 #else
 746 static inline
 747 int lttng_kretprobes_register(const char *name,
 748                 const char *symbol_name,
 749                 uint64_t offset,
 750                 uint64_t addr,
 751                 struct lttng_event *event_entry,
 752                 struct lttng_event *event_exit)
 753 {
 754         return -ENOSYS;
 755 }
 756
 757 static inline
 758 void lttng_kretprobes_unregister(struct lttng_event *event)
 759 {
 760 }
 761
 762 static inline
 763 void lttng_kretprobes_destroy_private(struct lttng_event *event)
 764 {
 765 }
 766
 767 static inline
 768 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
 769         int enable)
 770 {
 771         return -ENOSYS;
 772 }
 773 #endif
 774
 775 #ifdef CONFIG_DYNAMIC_FTRACE
 776 int lttng_ftrace_register(const char *name,
 777                           const char *symbol_name,
 778                           struct lttng_event *event);
 779 void lttng_ftrace_unregister(struct lttng_event *event);
 780 void lttng_ftrace_destroy_private(struct lttng_event *event);
 781 #else
 782 static inline
 783 int lttng_ftrace_register(const char *name,
 784                           const char *symbol_name,
 785                           struct lttng_event *event)
 786 {
 787         return -ENOSYS;
 788 }
 789
 790 static inline
 791 void lttng_ftrace_unregister(struct lttng_event *event)
 792 {
 793 }
 794
 795 static inline
 796 void lttng_ftrace_destroy_private(struct lttng_event *event)
 797 {
 798 }
 799 #endif
 800
 801 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 802
 803 extern const struct file_operations lttng_tracepoint_list_fops;
 804 extern const struct file_operations lttng_syscall_list_fops;
 805
 806 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 807 #define TRACEPOINT_HAS_DATA_ARG
 808 #endif
 809
 810 #endif /* _LTTNG_EVENTS_H */