include/lttng/events.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng/events.h
   4  *
   5  * Holds LTTng per-session event registry.
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_EVENTS_H
  11 #define _LTTNG_EVENTS_H
  12
  13 #include <lttng/kernel-version.h>
  14 #include <linux/list.h>
  15 #include <linux/kprobes.h>
  16 #include <linux/kref.h>
  17 #include <linux/uuid.h>
  18 #include <linux/irq_work.h>
  19 #include <wrapper/uprobes.h>
  20 #include <lttng/cpuhotplug.h>
  21 #include <lttng/tracer.h>
  22 #include <lttng/abi.h>
  23 #include <lttng/abi-old.h>
  24 #include <lttng/endian.h>
  25
  26 #define lttng_is_signed_type(type)      (((type) -1) < (type) 1)
  27
  28 struct lttng_channel;
  29 struct lttng_session;
  30 struct lttng_metadata_cache;
  31 struct lib_ring_buffer_ctx;
  32 struct perf_event;
  33 struct perf_event_attr;
  34 struct lib_ring_buffer_config;
  35
  36 /* Type description */
  37
  38 enum lttng_kernel_type {
  39         lttng_kernel_type_integer,
  40         lttng_kernel_type_string,
  41         lttng_kernel_type_enum,
  42         lttng_kernel_type_array,
  43         lttng_kernel_type_sequence,
  44         lttng_kernel_type_struct,
  45         lttng_kernel_type_variant,
  46         NR_LTTNG_KERNEL_TYPES,
  47 };
  48
  49 enum lttng_kernel_string_encoding {
  50         lttng_kernel_string_encoding_none = 0,
  51         lttng_kernel_string_encoding_UTF8 = 1,
  52         lttng_kernel_string_encoding_ASCII = 2,
  53         NR_LTTNG_KERNEL_STRING_ENCODING,
  54 };
  55
  56 enum channel_type {
  57         PER_CPU_CHANNEL,
  58         METADATA_CHANNEL,
  59 };
  60
  61 struct lttng_kernel_enum_value {
  62         unsigned long long value;
  63         unsigned int signedness:1;
  64 };
  65
  66 struct lttng_kernel_enum_entry {
  67         struct lttng_kernel_enum_value start, end;      /* start and end are inclusive */
  68         const char *string;
  69         struct {
  70                 unsigned int is_auto:1;
  71         } options;
  72 };
  73
  74 /*
  75  * struct lttng_kernel_type_common is fixed-size. Its children inherits
  76  * from it by embedding struct lttng_kernel_type_common as its first field.
  77  */
  78 struct lttng_kernel_type_common {
  79         enum lttng_kernel_type type;
  80 };
  81
  82 struct lttng_kernel_type_integer {
  83         struct lttng_kernel_type_common parent;
  84         unsigned int size;              /* in bits */
  85         unsigned short alignment;       /* in bits */
  86         unsigned int signedness:1,
  87                 reverse_byte_order:1;
  88         unsigned int base;              /* 2, 8, 10, 16, for pretty print */
  89 };
  90
  91 struct lttng_kernel_type_string {
  92         struct lttng_kernel_type_common parent;
  93         enum lttng_kernel_string_encoding encoding;
  94 };
  95
  96 struct lttng_kernel_type_enum {
  97         struct lttng_kernel_type_common parent;
  98         const struct lttng_kernel_enum_desc *desc;      /* Enumeration mapping */
  99         const struct lttng_kernel_type_common *container_type;
 100 };
 101
 102 struct lttng_kernel_type_array {
 103         struct lttng_kernel_type_common parent;
 104         const struct lttng_kernel_type_common *elem_type;
 105         unsigned int length;                    /* Num. elems. */
 106         unsigned int alignment;
 107         enum lttng_kernel_string_encoding encoding;
 108 };
 109
 110 struct lttng_kernel_type_sequence {
 111         struct lttng_kernel_type_common parent;
 112         const char *length_name;        /* Length field name. If NULL, use previous field. */
 113         const struct lttng_kernel_type_common *elem_type;
 114         unsigned int alignment;         /* Alignment before elements. */
 115         enum lttng_kernel_string_encoding encoding;
 116 };
 117
 118 struct lttng_kernel_type_struct {
 119         struct lttng_kernel_type_common parent;
 120         unsigned int nr_fields;
 121         const struct lttng_kernel_event_field **fields; /* Array of pointers to fields. */
 122         unsigned int alignment;
 123 };
 124
 125 struct lttng_kernel_type_variant {
 126         struct lttng_kernel_type_common parent;
 127         const char *tag_name;           /* Tag field name. If NULL, use previous field. */
 128         const struct lttng_kernel_event_field **choices; /* Array of pointers to fields. */
 129         unsigned int nr_choices;
 130         unsigned int alignment;
 131 };
 132
 133 struct lttng_kernel_enum_desc {
 134         const char *name;
 135         const struct lttng_kernel_enum_entry **entries;
 136         unsigned int nr_entries;
 137 };
 138
 139 /* Event field description */
 140
 141 struct lttng_kernel_event_field {
 142         const char *name;
 143         const struct lttng_kernel_type_common *type;
 144         unsigned int nowrite:1,         /* do not write into trace */
 145                         user:1,         /* fetch from user-space */
 146                         nofilter:1;     /* do not consider for filter */
 147 };
 148
 149 #define lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, _base)            \
 150         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_integer, { \
 151                 .parent = {                                                                             \
 152                         .type = lttng_kernel_type_integer,                                                      \
 153                 },                                                                                      \
 154                 .size = (_size),                                                                        \
 155                 .alignment = (_alignment),                                                              \
 156                 .signedness = (_signedness),                                                            \
 157                 .reverse_byte_order = (_byte_order) != __BYTE_ORDER,                                    \
 158                 .base = (_base),                                                                        \
 159         }))
 160
 161 #define lttng_kernel_static_type_integer_from_type(_type, _byte_order, _base)                           \
 162         lttng_kernel_static_type_integer(sizeof(_type) * CHAR_BIT,                                      \
 163                         lttng_alignof(_type) * CHAR_BIT,                                                \
 164                         lttng_is_signed_type(_type),                                                    \
 165                         _byte_order,                                                                    \
 166                         _base)
 167
 168 #define lttng_kernel_static_type_enum(_desc, _container_type)                                           \
 169         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_enum, { \
 170                 .parent = {                                                                             \
 171                         .type = lttng_kernel_type_enum,                                                 \
 172                 },                                                                                      \
 173                 .desc = (_desc),                                                                        \
 174                 .container_type = (_container_type),                                                    \
 175         }))
 176
 177 #define lttng_kernel_static_type_array(_length, _elem_type, _alignment, _encoding)                      \
 178         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_array, { \
 179                 .parent = {                                                                             \
 180                         .type = lttng_kernel_type_array,                                                \
 181                 },                                                                                      \
 182                 .length = (_length),                                                                    \
 183                 .alignment = (_alignment),                                                              \
 184                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 185                 .elem_type = (_elem_type),                                                              \
 186         }))
 187
 188 #define lttng_kernel_static_type_array_text(_length)                                                    \
 189         lttng_kernel_static_type_array(_length,                                                         \
 190                 lttng_kernel_static_type_integer(sizeof(char) * CHAR_BIT,                               \
 191                                 lttng_alignof(char) * CHAR_BIT, lttng_is_signed_type(char),             \
 192                                 __BYTE_ORDER, 10),                                                      \
 193                 0, UTF8)
 194
 195 #define lttng_kernel_static_type_sequence(_length_name, _elem_type, _alignment, _encoding)                      \
 196         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_sequence, { \
 197                 .parent = {                                                                             \
 198                         .type = lttng_kernel_type_sequence,                                             \
 199                 },                                                                                      \
 200                 .length_name = (_length_name),                                                          \
 201                 .alignment = (_alignment),                                                              \
 202                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 203                 .elem_type = (_elem_type),                                                              \
 204         }))
 205
 206 #define lttng_kernel_static_type_string(_encoding)                                                      \
 207         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_string, { \
 208                 .parent = {                                                                             \
 209                         .type = lttng_kernel_type_string,                                               \
 210                 },                                                                                      \
 211                 .encoding = lttng_kernel_string_encoding_##_encoding,                                   \
 212         }))
 213
 214 #define lttng_kernel_static_type_struct(_nr_fields, _fields, _alignment)                                \
 215         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_struct, { \
 216                 .parent = {                                                                             \
 217                         .type = lttng_kernel_type_struct,                                               \
 218                 },                                                                                      \
 219                 .nr_fields = (_nr_fields),                                                              \
 220                 .fields = _fields,                                                                      \
 221                 .alignment = (_alignment),                                                              \
 222         }))
 223
 224 #define lttng_kernel_static_type_variant(_nr_choices, _choices, _tag_name, _alignment)                  \
 225         ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_variant, { \
 226                 .parent = {                                                                             \
 227                         .type = lttng_kernel_type_variant,                                              \
 228                 },                                                                                      \
 229                 .tag_name = (_tag_name),                                                                \
 230                 .choices = _choices,                                                                    \
 231                 .nr_choices = (_nr_choices),                                                            \
 232                 .alignment = (_alignment),                                                              \
 233         }))
 234
 235 #define lttng_kernel_static_event_field(_name, _type, _nowrite, _user, _nofilter)                       \
 236         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field, {                               \
 237                 .name = (_name),                                                                        \
 238                 .type = (_type),                                                                        \
 239                 .nowrite = (_nowrite),                                                                  \
 240                 .user = (_user),                                                                        \
 241                 .nofilter = (_nofilter),                                                                \
 242         })
 243
 244 #define lttng_kernel_static_event_field_array(_fields...)                                               \
 245         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field *,                               \
 246                 _fields                                                                                 \
 247         )
 248
 249 #define lttng_kernel_static_enum_entry_value(_string, _value)                                           \
 250         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 251                 .start = {                                                                              \
 252                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 253                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 254                                 (long long) (_value) : (_value),                                        \
 255                 },                                                                                      \
 256                 .end = {                                                                                \
 257                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 258                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 259                                 (long long) (_value) : (_value),                                        \
 260                 },                                                                                      \
 261                 .string = (_string),                                                                    \
 262         }),
 263
 264 #define lttng_kernel_static_enum_entry_range(_string, _range_start, _range_end)                         \
 265         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 266                 .start = {                                                                              \
 267                         .signedness = lttng_is_signed_type(__typeof__(_range_start)),                   \
 268                         .value = lttng_is_signed_type(__typeof__(_range_start)) ?                       \
 269                                 (long long) (_range_start) : (_range_start),                            \
 270                 },                                                                                      \
 271                 .end = {                                                                                \
 272                         .signedness = lttng_is_signed_type(__typeof__(_range_end)),                     \
 273                         .value = lttng_is_signed_type(__typeof__(_range_end)) ?                         \
 274                                 (long long) (_range_end) : (_range_end),                                \
 275                 },                                                                                      \
 276                 .string = (_string),                                                                    \
 277         }),
 278
 279 #define lttng_kernel_static_enum_entry_auto(_string)                                                    \
 280         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 281                 .start = {                                                                              \
 282                         .signedness = -1,                                                               \
 283                         .value = -1,                                                                    \
 284                 },                                                                                      \
 285                 .end = {                                                                                \
 286                         .signedness = -1,                                                               \
 287                         .value = -1,                                                                    \
 288                 },                                                                                      \
 289                 .string = (_string),                                                                    \
 290                 .options = {                                                                            \
 291                         .is_auto = 1,                                                                   \
 292                 }                                                                                       \
 293         }),
 294
 295 struct lttng_probe_ctx {
 296         struct lttng_kernel_event_common *event;
 297         uint8_t interruptible;
 298 };
 299
 300 struct lttng_kernel_event_desc {
 301         const char *event_name;         /* lttng-modules name */
 302         const char *event_kname;        /* Linux kernel name (tracepoints) */
 303         const struct lttng_kernel_probe_desc *probe_desc;
 304         void (*probe_callback)(void);
 305         const struct lttng_kernel_event_field **fields; /* event payload */
 306         unsigned int nr_fields;
 307         struct module *owner;
 308 };
 309
 310 struct lttng_kernel_probe_desc {
 311         const char *provider_name;
 312         const struct lttng_kernel_event_desc **event_desc;
 313         unsigned int nr_events;
 314         struct list_head head;                  /* chain registered probes */
 315         struct list_head lazy_init_head;
 316         int lazy;                               /* lazy registration */
 317 };
 318
 319 struct lttng_krp;                               /* Kretprobe handling */
 320
 321 enum lttng_kernel_bytecode_type {
 322         LTTNG_KERNEL_BYTECODE_TYPE_FILTER,
 323         LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE,
 324 };
 325
 326 struct lttng_kernel_bytecode_node {
 327         enum lttng_kernel_bytecode_type type;
 328         struct list_head node;
 329         struct lttng_enabler *enabler;
 330         struct {
 331                 uint32_t len;
 332                 uint32_t reloc_offset;
 333                 uint64_t seqnum;
 334                 char data[];
 335         } bc;
 336 };
 337
 338 struct lttng_interpreter_output;
 339
 340 struct lttng_bytecode_runtime {
 341         /* Associated bytecode */
 342         enum lttng_kernel_bytecode_type type;
 343         struct lttng_kernel_bytecode_node *bc;
 344         int (*interpreter_func)(struct lttng_bytecode_runtime *kernel_bytecode,
 345                                 const char *interpreter_stack_data,
 346                                 struct lttng_probe_ctx *lttng_probe_ctx,
 347                                 void *caller_ctx);
 348         int link_failed;
 349         struct list_head node;  /* list of bytecode runtime in event */
 350         struct lttng_kernel_ctx *ctx;
 351 };
 352
 353 /*
 354  * Objects in a linked-list of enablers, owned by an event.
 355  */
 356 struct lttng_enabler_ref {
 357         struct list_head node;                  /* enabler ref list */
 358         struct lttng_enabler *ref;              /* backward ref */
 359 };
 360
 361 struct lttng_uprobe_handler {
 362         struct lttng_kernel_event_common *event;
 363         loff_t offset;
 364         struct uprobe_consumer up_consumer;
 365         struct list_head node;
 366 };
 367
 368 struct lttng_kprobe {
 369         struct kprobe kp;
 370         char *symbol_name;
 371 };
 372
 373 struct lttng_uprobe {
 374         struct inode *inode;
 375         struct list_head head;
 376 };
 377
 378 enum lttng_syscall_entryexit {
 379         LTTNG_SYSCALL_ENTRY,
 380         LTTNG_SYSCALL_EXIT,
 381 };
 382
 383 enum lttng_syscall_abi {
 384         LTTNG_SYSCALL_ABI_NATIVE,
 385         LTTNG_SYSCALL_ABI_COMPAT,
 386 };
 387
 388 /*
 389  * Result of the run_filter() callback.
 390  */
 391 enum lttng_kernel_event_filter_result {
 392         LTTNG_KERNEL_EVENT_FILTER_ACCEPT = 0,
 393         LTTNG_KERNEL_EVENT_FILTER_REJECT = 1,
 394 };
 395
 396 struct lttng_kernel_event_common_private;
 397
 398 enum lttng_kernel_event_type {
 399         LTTNG_KERNEL_EVENT_TYPE_RECORDER = 0,
 400         LTTNG_KERNEL_EVENT_TYPE_NOTIFIER = 1,
 401 };
 402
 403 struct lttng_kernel_event_common {
 404         struct lttng_kernel_event_common_private *priv; /* Private event interface */
 405
 406         enum lttng_kernel_event_type type;
 407         /* Get child with container_of(). */
 408
 409         int enabled;
 410         int eval_filter;                                /* Need to evaluate filters */
 411         int (*run_filter)(const struct lttng_kernel_event_common *event,
 412                 const char *stack_data,
 413                 struct lttng_probe_ctx *probe_ctx,
 414                 void *filter_ctx);
 415 };
 416
 417 struct lttng_kernel_event_recorder_private;
 418
 419 struct lttng_kernel_event_recorder {
 420         struct lttng_kernel_event_common parent;
 421         struct lttng_kernel_event_recorder_private *priv;       /* Private event record interface */
 422
 423         struct lttng_channel *chan;
 424 };
 425
 426 struct lttng_kernel_notification_ctx {
 427         int eval_capture;                                       /* Capture evaluation available. */
 428 };
 429
 430 struct lttng_kernel_event_notifier_private;
 431
 432 struct lttng_kernel_event_notifier {
 433         struct lttng_kernel_event_common parent;
 434         struct lttng_kernel_event_notifier_private *priv;       /* Private event notifier interface */
 435
 436         int eval_capture;                               /* Need to evaluate capture */
 437         void (*notification_send)(struct lttng_kernel_event_notifier *event_notifier,
 438                 const char *stack_data,
 439                 struct lttng_probe_ctx *probe_ctx,
 440                 struct lttng_kernel_notification_ctx *notif_ctx);
 441 };
 442
 443 enum lttng_enabler_format_type {
 444         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 445         LTTNG_ENABLER_FORMAT_NAME,
 446 };
 447
 448 struct lttng_channel_ops {
 449         struct channel *(*channel_create)(const char *name,
 450                                 void *priv,
 451                                 void *buf_addr,
 452                                 size_t subbuf_size, size_t num_subbuf,
 453                                 unsigned int switch_timer_interval,
 454                                 unsigned int read_timer_interval);
 455         void (*channel_destroy)(struct channel *chan);
 456         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 457         int (*buffer_has_read_closed_stream)(struct channel *chan);
 458         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 459         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx);
 460         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 461         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 462                             size_t len);
 463         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 464                                       const void *src, size_t len);
 465         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 466                              int c, size_t len);
 467         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 468                              size_t len);
 469         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 470                                        const char __user *src, size_t len);
 471         /*
 472          * packet_avail_size returns the available size in the current
 473          * packet. Note that the size returned is only a hint, since it
 474          * may change due to concurrent writes.
 475          */
 476         size_t (*packet_avail_size)(struct channel *chan);
 477         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 478         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 479         int (*is_finalized)(struct channel *chan);
 480         int (*is_disabled)(struct channel *chan);
 481         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 482                         struct lib_ring_buffer *bufb,
 483                         uint64_t *timestamp_begin);
 484         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 485                         struct lib_ring_buffer *bufb,
 486                         uint64_t *timestamp_end);
 487         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 488                         struct lib_ring_buffer *bufb,
 489                         uint64_t *events_discarded);
 490         int (*content_size) (const struct lib_ring_buffer_config *config,
 491                         struct lib_ring_buffer *bufb,
 492                         uint64_t *content_size);
 493         int (*packet_size) (const struct lib_ring_buffer_config *config,
 494                         struct lib_ring_buffer *bufb,
 495                         uint64_t *packet_size);
 496         int (*stream_id) (const struct lib_ring_buffer_config *config,
 497                         struct lib_ring_buffer *bufb,
 498                         uint64_t *stream_id);
 499         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 500                         struct lib_ring_buffer *bufb,
 501                         uint64_t *ts);
 502         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 503                         struct lib_ring_buffer *bufb,
 504                         uint64_t *seq);
 505         int (*instance_id) (const struct lib_ring_buffer_config *config,
 506                         struct lib_ring_buffer *bufb,
 507                         uint64_t *id);
 508 };
 509
 510 struct lttng_counter_ops {
 511         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 512                         const size_t *max_nr_elem,      /* for each dimension */
 513                         int64_t global_sum_step);
 514         void (*counter_destroy)(struct lib_counter *counter);
 515         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 516                         int64_t v);
 517         /*
 518          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 519          * the global aggregation counter if @cpu == -1.
 520          */
 521         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 522                          int64_t *value, bool *overflow, bool *underflow);
 523         /*
 524          * counter_aggregate returns the total sum of all per-cpu counters and
 525          * the global aggregation counter.
 526          */
 527         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 528                         int64_t *value, bool *overflow, bool *underflow);
 529         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 530 };
 531
 532 struct lttng_transport {
 533         char *name;
 534         struct module *owner;
 535         struct list_head node;
 536         struct lttng_channel_ops ops;
 537 };
 538
 539 struct lttng_counter_transport {
 540         char *name;
 541         struct module *owner;
 542         struct list_head node;
 543         struct lttng_counter_ops ops;
 544 };
 545
 546 struct lttng_syscall_filter;
 547
 548 #define LTTNG_EVENT_HT_BITS             12
 549 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 550
 551 struct lttng_event_ht {
 552         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 553 };
 554
 555 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 556 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 557
 558 struct lttng_event_notifier_ht {
 559         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 560 };
 561
 562 struct lttng_channel {
 563         unsigned int id;
 564         struct channel *chan;           /* Channel buffers */
 565         int enabled;
 566         struct lttng_kernel_ctx *ctx;
 567         /* Event ID management */
 568         struct lttng_session *session;
 569         struct file *file;              /* File associated to channel */
 570         unsigned int free_event_id;     /* Next event ID to allocate */
 571         struct list_head list;          /* Channel list */
 572         struct lttng_channel_ops *ops;
 573         struct lttng_transport *transport;
 574         struct hlist_head *sc_table;    /* for syscall tracing */
 575         struct hlist_head *compat_sc_table;
 576         struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
 577         struct hlist_head *compat_sc_exit_table;
 578         struct hlist_head sc_unknown;   /* for unknown syscalls */
 579         struct hlist_head sc_compat_unknown;
 580         struct hlist_head sc_exit_unknown;
 581         struct hlist_head compat_sc_exit_unknown;
 582         struct lttng_syscall_filter *sc_filter;
 583         int header_type;                /* 0: unset, 1: compact, 2: large */
 584         enum channel_type channel_type;
 585         int syscall_all_entry;
 586         int syscall_all_exit;
 587         unsigned int metadata_dumped:1,
 588                 sys_enter_registered:1,
 589                 sys_exit_registered:1,
 590                 tstate:1;               /* Transient enable state */
 591 };
 592
 593 struct lttng_metadata_stream {
 594         void *priv;                     /* Ring buffer private data */
 595         struct lttng_metadata_cache *metadata_cache;
 596         unsigned int metadata_in;       /* Bytes read from the cache */
 597         unsigned int metadata_out;      /* Bytes consumed from stream */
 598         int finalized;                  /* Has channel been finalized */
 599         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 600         struct list_head list;          /* Stream list */
 601         struct lttng_transport *transport;
 602         uint64_t version;               /* Current version of the metadata cache */
 603         bool coherent;                  /* Stream in a coherent state */
 604 };
 605
 606 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 607
 608 struct lttng_dynamic_len_stack {
 609         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 610         size_t offset;
 611 };
 612
 613 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 614
 615 /*
 616  * struct lttng_id_tracker declared in header due to deferencing of *v
 617  * in RCU_INITIALIZER(v).
 618  */
 619 #define LTTNG_ID_HASH_BITS      6
 620 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 621
 622 enum tracker_type {
 623         TRACKER_PID,
 624         TRACKER_VPID,
 625         TRACKER_UID,
 626         TRACKER_VUID,
 627         TRACKER_GID,
 628         TRACKER_VGID,
 629
 630         TRACKER_UNKNOWN,
 631 };
 632
 633 struct lttng_id_tracker_rcu {
 634         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 635 };
 636
 637 struct lttng_id_tracker {
 638         struct lttng_session *session;
 639         enum tracker_type tracker_type;
 640         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 641 };
 642
 643 struct lttng_id_hash_node {
 644         struct hlist_node hlist;
 645         int id;
 646 };
 647
 648 struct lttng_session {
 649         int active;                     /* Is trace session active ? */
 650         int been_active;                /* Has trace session been active ? */
 651         struct file *file;              /* File associated to session */
 652         struct list_head chan;          /* Channel list head */
 653         struct list_head events;        /* Event list head */
 654         struct list_head list;          /* Session list */
 655         unsigned int free_chan_id;      /* Next chan ID to allocate */
 656         uuid_le uuid;                   /* Trace session unique ID */
 657         struct lttng_metadata_cache *metadata_cache;
 658         struct lttng_id_tracker pid_tracker;
 659         struct lttng_id_tracker vpid_tracker;
 660         struct lttng_id_tracker uid_tracker;
 661         struct lttng_id_tracker vuid_tracker;
 662         struct lttng_id_tracker gid_tracker;
 663         struct lttng_id_tracker vgid_tracker;
 664         unsigned int metadata_dumped:1,
 665                 tstate:1;               /* Transient enable state */
 666         /* List of event enablers */
 667         struct list_head enablers_head;
 668         /* Hash table of events */
 669         struct lttng_event_ht events_ht;
 670         char name[LTTNG_KERNEL_ABI_SESSION_NAME_LEN];
 671         char creation_time[LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN];
 672 };
 673
 674 struct lttng_counter {
 675         struct file *file;              /* File associated to counter. */
 676         struct file *owner;
 677         struct lttng_counter_transport *transport;
 678         struct lib_counter *counter;
 679         struct lttng_counter_ops *ops;
 680 };
 681
 682 struct lttng_event_notifier_group {
 683         struct file *file;              /* File associated to event notifier group */
 684         struct file *notif_file;        /* File used to expose notifications to userspace. */
 685         struct list_head node;          /* event notifier group list */
 686         struct list_head enablers_head; /* List of enablers */
 687         struct list_head event_notifiers_head; /* List of event notifier */
 688         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 689         struct lttng_channel_ops *ops;
 690         struct lttng_transport *transport;
 691         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 692         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 693         wait_queue_head_t read_wait;
 694         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 695         struct lttng_kernel_event_notifier *sc_unknown; /* for unknown syscalls */
 696         struct lttng_kernel_event_notifier *sc_compat_unknown;
 697
 698         struct lttng_syscall_filter *sc_filter;
 699
 700         struct hlist_head *event_notifier_syscall_dispatch;
 701         struct hlist_head *event_notifier_compat_syscall_dispatch;
 702         struct hlist_head *event_notifier_exit_syscall_dispatch;
 703         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 704
 705         struct hlist_head event_notifier_unknown_syscall_dispatch;
 706         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 707         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 708         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 709
 710         int syscall_all_entry;
 711         int syscall_all_exit;
 712
 713         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 714
 715         struct lttng_counter *error_counter;
 716         size_t error_counter_len;
 717 };
 718
 719 struct lttng_metadata_cache {
 720         char *data;                     /* Metadata cache */
 721         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 722         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 723         atomic_t producing;             /* Metadata being produced (incomplete) */
 724         struct kref refcount;           /* Metadata cache usage */
 725         struct list_head metadata_stream;       /* Metadata stream list */
 726         uuid_le uuid;                   /* Trace session unique ID (copy) */
 727         struct mutex lock;              /* Produce/consume lock */
 728         uint64_t version;               /* Current version of the metadata */
 729 };
 730
 731 void lttng_lock_sessions(void);
 732 void lttng_unlock_sessions(void);
 733
 734 struct list_head *lttng_get_probe_list_head(void);
 735
 736 struct lttng_event_enabler *lttng_event_enabler_create(
 737                 enum lttng_enabler_format_type format_type,
 738                 struct lttng_kernel_abi_event *event_param,
 739                 struct lttng_channel *chan);
 740
 741 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 742 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 743 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 744                 struct lttng_event_notifier_group *event_notifier_group,
 745                 enum lttng_enabler_format_type format_type,
 746                 struct lttng_kernel_abi_event_notifier *event_notifier_param);
 747
 748 int lttng_event_notifier_enabler_enable(
 749                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 750 int lttng_event_notifier_enabler_disable(
 751                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 752 int lttng_fix_pending_events(void);
 753 int lttng_fix_pending_event_notifiers(void);
 754 int lttng_session_active(void);
 755 bool lttng_event_notifier_active(void);
 756
 757 struct lttng_session *lttng_session_create(void);
 758 int lttng_session_enable(struct lttng_session *session);
 759 int lttng_session_disable(struct lttng_session *session);
 760 void lttng_session_destroy(struct lttng_session *session);
 761 int lttng_session_metadata_regenerate(struct lttng_session *session);
 762 int lttng_session_statedump(struct lttng_session *session);
 763 void metadata_cache_destroy(struct kref *kref);
 764
 765 struct lttng_counter *lttng_kernel_counter_create(
 766                 const char *counter_transport_name, size_t number_dimensions,
 767                 const size_t *dimensions_sizes);
 768 int lttng_kernel_counter_read(struct lttng_counter *counter,
 769                 const size_t *dimension_indexes, int32_t cpu,
 770                 int64_t *val, bool *overflow, bool *underflow);
 771 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
 772                 const size_t *dimension_indexes, int64_t *val,
 773                 bool *overflow, bool *underflow);
 774 int lttng_kernel_counter_clear(struct lttng_counter *counter,
 775                 const size_t *dimension_indexes);
 776
 777
 778 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 779 int lttng_event_notifier_group_create_error_counter(
 780                 struct file *event_notifier_group_file,
 781                 const struct lttng_kernel_abi_counter_conf *error_counter_conf);
 782 void lttng_event_notifier_group_destroy(
 783                 struct lttng_event_notifier_group *event_notifier_group);
 784
 785 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 786                                        const char *transport_name,
 787                                        void *buf_addr,
 788                                        size_t subbuf_size, size_t num_subbuf,
 789                                        unsigned int switch_timer_interval,
 790                                        unsigned int read_timer_interval,
 791                                        enum channel_type channel_type);
 792 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 793                                        int overwrite, void *buf_addr,
 794                                        size_t subbuf_size, size_t num_subbuf,
 795                                        unsigned int switch_timer_interval,
 796                                        unsigned int read_timer_interval);
 797
 798 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 799 struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
 800                                 struct lttng_kernel_abi_event *event_param,
 801                                 const struct lttng_kernel_event_desc *event_desc,
 802                                 enum lttng_kernel_abi_instrumentation itype);
 803 struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
 804                                 struct lttng_kernel_abi_event *event_param,
 805                                 const struct lttng_kernel_event_desc *event_desc,
 806                                 enum lttng_kernel_abi_instrumentation itype);
 807 struct lttng_kernel_event_recorder *lttng_event_compat_old_create(struct lttng_channel *chan,
 808                 struct lttng_kernel_abi_old_event *old_event_param,
 809                 const struct lttng_kernel_event_desc *internal_desc);
 810
 811 struct lttng_kernel_event_notifier *lttng_event_notifier_create(
 812                                 const struct lttng_kernel_event_desc *event_notifier_desc,
 813                                 uint64_t id,
 814                                 uint64_t error_counter_idx,
 815                                 struct lttng_event_notifier_group *event_notifier_group,
 816                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
 817                                 enum lttng_kernel_abi_instrumentation itype);
 818 struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
 819                                 const struct lttng_kernel_event_desc *event_notifier_desc,
 820                                 uint64_t id,
 821                                 uint64_t error_counter_idx,
 822                                 struct lttng_event_notifier_group *event_notifier_group,
 823                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
 824                                 enum lttng_kernel_abi_instrumentation itype);
 825
 826 int lttng_channel_enable(struct lttng_channel *channel);
 827 int lttng_channel_disable(struct lttng_channel *channel);
 828 int lttng_event_enable(struct lttng_kernel_event_common *event);
 829 int lttng_event_disable(struct lttng_kernel_event_common *event);
 830
 831 void lttng_transport_register(struct lttng_transport *transport);
 832 void lttng_transport_unregister(struct lttng_transport *transport);
 833
 834 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
 835 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
 836
 837 void synchronize_trace(void);
 838 int lttng_abi_init(void);
 839 int lttng_abi_compat_old_init(void);
 840 void lttng_abi_exit(void);
 841 void lttng_abi_compat_old_exit(void);
 842
 843 int lttng_probe_register(struct lttng_kernel_probe_desc *desc);
 844 void lttng_probe_unregister(struct lttng_kernel_probe_desc *desc);
 845 const struct lttng_kernel_event_desc *lttng_event_desc_get(const char *name);
 846 void lttng_event_desc_put(const struct lttng_kernel_event_desc *desc);
 847 int lttng_probes_init(void);
 848 void lttng_probes_exit(void);
 849
 850 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 851                 struct channel *chan, bool *coherent);
 852
 853 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 854 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 855 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 856 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 857 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 858 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 859
 860 int lttng_session_track_id(struct lttng_session *session,
 861                 enum tracker_type tracker_type, int id);
 862 int lttng_session_untrack_id(struct lttng_session *session,
 863                 enum tracker_type tracker_type, int id);
 864
 865 int lttng_session_list_tracker_ids(struct lttng_session *session,
 866                 enum tracker_type tracker_type);
 867
 868 void lttng_clock_ref(void);
 869 void lttng_clock_unref(void);
 870
 871 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
 872                 struct lttng_enabler *enabler);
 873
 874 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 875 int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler);
 876 int lttng_syscalls_unregister_channel(struct lttng_channel *chan);
 877 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 878 int lttng_syscall_filter_enable_event(
 879                 struct lttng_channel *chan,
 880                 struct lttng_kernel_event_recorder *event);
 881 int lttng_syscall_filter_disable_event(
 882                 struct lttng_channel *chan,
 883                 struct lttng_kernel_event_recorder *event);
 884
 885 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 886                 struct lttng_kernel_abi_syscall_mask __user *usyscall_mask);
 887
 888 int lttng_syscalls_register_event_notifier(
 889                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 890 int lttng_syscalls_create_matching_event_notifiers(
 891                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 892 int lttng_syscalls_unregister_event_notifier_group(struct lttng_event_notifier_group *group);
 893 int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 894 int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 895 #else
 896 static inline int lttng_syscalls_register_event(
 897                 struct lttng_event_enabler *event_enabler)
 898 {
 899         return -ENOSYS;
 900 }
 901
 902 static inline int lttng_syscalls_unregister_channel(struct lttng_channel *chan)
 903 {
 904         return 0;
 905 }
 906
 907 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
 908 {
 909         return 0;
 910 }
 911
 912 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
 913                 struct lttng_kernel_event_recorder *event);
 914 {
 915         return -ENOSYS;
 916 }
 917
 918 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
 919                 struct lttng_kernel_event_recorder *event);
 920 {
 921         return -ENOSYS;
 922 }
 923
 924 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
 925                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
 926 {
 927         return -ENOSYS;
 928 }
 929
 930 static inline int lttng_syscalls_register_event_notifier(
 931                 struct lttng_event_notifier_group *group)
 932 {
 933         return -ENOSYS;
 934 }
 935
 936 static inline int lttng_syscalls_unregister_event_notifier_group(
 937                 struct lttng_event_notifier_group *group)
 938 {
 939         return 0;
 940 }
 941
 942 static inline int lttng_syscall_filter_enable_event_notifier(
 943                 struct lttng_event_notifier_group *group,
 944                 const char *name)
 945 {
 946         return -ENOSYS;
 947 }
 948
 949 static inline int lttng_syscall_filter_disable_event_notifier(
 950                 struct lttng_event_notifier_group *group,
 951                 const char *name)
 952 {
 953         return -ENOSYS;
 954 }
 955
 956 #endif
 957
 958 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
 959                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
 960 int lttng_event_notifier_enabler_attach_filter_bytecode(
 961                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 962                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
 963 int lttng_event_notifier_enabler_attach_capture_bytecode(
 964                 struct lttng_event_notifier_enabler *event_notifier_enabler,
 965                 struct lttng_kernel_abi_capture_bytecode __user *bytecode);
 966
 967 void lttng_enabler_link_bytecode(const struct lttng_kernel_event_desc *event_desc,
 968                 struct lttng_kernel_ctx *ctx,
 969                 struct list_head *instance_bytecode_runtime_head,
 970                 struct list_head *enabler_bytecode_runtime_head);
 971 void lttng_free_event_filter_runtime(struct lttng_kernel_event_common *event);
 972
 973 int lttng_probes_init(void);
 974
 975 int lttng_logger_init(void);
 976 void lttng_logger_exit(void);
 977
 978 extern int lttng_statedump_start(struct lttng_session *session);
 979
 980 #ifdef CONFIG_KPROBES
 981 int lttng_kprobes_register_event(const char *name,
 982                 const char *symbol_name,
 983                 uint64_t offset,
 984                 uint64_t addr,
 985                 struct lttng_kernel_event_recorder *event);
 986 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event);
 987 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
 988 int lttng_kprobes_register_event_notifier(const char *symbol_name,
 989                 uint64_t offset,
 990                 uint64_t addr,
 991                 struct lttng_kernel_event_notifier *event_notifier);
 992 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
 993 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
 994 #else
 995 static inline
 996 int lttng_kprobes_register_event(const char *name,
 997                 const char *symbol_name,
 998                 uint64_t offset,
 999                 uint64_t addr,
1000                 struct lttng_kernel_event_recorder *event)
1001 {
1002         return -ENOSYS;
1003 }
1004
1005 static inline
1006 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event)
1007 {
1008 }
1009
1010 static inline
1011 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
1012 {
1013 }
1014
1015 static inline
1016 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1017                 uint64_t offset,
1018                 uint64_t addr,
1019                 struct lttng_kernel_event_notifier *event_notifier)
1020 {
1021         return -ENOSYS;
1022 }
1023
1024 static inline
1025 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1026 {
1027 }
1028
1029 static inline
1030 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
1031 {
1032 }
1033 #endif
1034
1035 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
1036         struct lttng_kernel_abi_event_callsite __user *callsite);
1037
1038 #ifdef CONFIG_UPROBES
1039 int lttng_uprobes_register_event(const char *name,
1040         int fd, struct lttng_kernel_event_recorder *event);
1041 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
1042         struct lttng_kernel_abi_event_callsite __user *callsite);
1043 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event);
1044 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
1045 int lttng_uprobes_register_event_notifier(const char *name,
1046         int fd, struct lttng_kernel_event_notifier *event_notifier);
1047 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
1048 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
1049 #else
1050 static inline
1051 int lttng_uprobes_register_event(const char *name,
1052         int fd, struct lttng_kernel_event_recorder *event)
1053 {
1054         return -ENOSYS;
1055 }
1056
1057 static inline
1058 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
1059         struct lttng_kernel_abi_event_callsite __user *callsite)
1060 {
1061         return -ENOSYS;
1062 }
1063
1064 static inline
1065 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event)
1066 {
1067 }
1068
1069 static inline
1070 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
1071 {
1072 }
1073
1074 static inline
1075 int lttng_uprobes_register_event_notifier(const char *name,
1076         int fd, struct lttng_kernel_event_notifier *event_notifier)
1077 {
1078         return -ENOSYS;
1079 }
1080
1081 static inline
1082 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1083 {
1084 }
1085
1086 static inline
1087 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
1088 {
1089 }
1090 #endif
1091
1092 #ifdef CONFIG_KRETPROBES
1093 int lttng_kretprobes_register(const char *name,
1094                 const char *symbol_name,
1095                 uint64_t offset,
1096                 uint64_t addr,
1097                 struct lttng_kernel_event_recorder *event_entry,
1098                 struct lttng_kernel_event_recorder *event_exit);
1099 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event);
1100 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event);
1101 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1102         int enable);
1103 #else
1104 static inline
1105 int lttng_kretprobes_register(const char *name,
1106                 const char *symbol_name,
1107                 uint64_t offset,
1108                 uint64_t addr,
1109                 struct lttng_kernel_event_recorder *event_entry,
1110                 struct lttng_kernel_event_recorder *event_exit)
1111 {
1112         return -ENOSYS;
1113 }
1114
1115 static inline
1116 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event)
1117 {
1118 }
1119
1120 static inline
1121 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event)
1122 {
1123 }
1124
1125 static inline
1126 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1127         int enable)
1128 {
1129         return -ENOSYS;
1130 }
1131 #endif
1132
1133 int lttng_calibrate(struct lttng_kernel_abi_calibrate *calibrate);
1134
1135 extern const struct file_operations lttng_tracepoint_list_fops;
1136 extern const struct file_operations lttng_syscall_list_fops;
1137
1138 #define TRACEPOINT_HAS_DATA_ARG
1139
1140 #endif /* _LTTNG_EVENTS_H */