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_ctx_field(_event_field, _get_size, _get_size_arg, _record, _get_value, _destroy, _priv) \
 250         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_ctx_field, {                                 \
 251                 .event_field = (_event_field),                                                          \
 252                 .get_size = (_get_size),                                                                \
 253                 .get_size_arg = (_get_size_arg),                                                        \
 254                 .record = (_record),                                                                    \
 255                 .get_value = (_get_value),                                                              \
 256                 .destroy = (_destroy),                                                                  \
 257                 .priv = (_priv),                                                                        \
 258         })
 259
 260 #define lttng_kernel_static_enum_entry_value(_string, _value)                                           \
 261         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 262                 .start = {                                                                              \
 263                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 264                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 265                                 (long long) (_value) : (_value),                                        \
 266                 },                                                                                      \
 267                 .end = {                                                                                \
 268                         .signedness = lttng_is_signed_type(__typeof__(_value)),                         \
 269                         .value = lttng_is_signed_type(__typeof__(_value)) ?                             \
 270                                 (long long) (_value) : (_value),                                        \
 271                 },                                                                                      \
 272                 .string = (_string),                                                                    \
 273         }),
 274
 275 #define lttng_kernel_static_enum_entry_range(_string, _range_start, _range_end)                         \
 276         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 277                 .start = {                                                                              \
 278                         .signedness = lttng_is_signed_type(__typeof__(_range_start)),                   \
 279                         .value = lttng_is_signed_type(__typeof__(_range_start)) ?                       \
 280                                 (long long) (_range_start) : (_range_start),                            \
 281                 },                                                                                      \
 282                 .end = {                                                                                \
 283                         .signedness = lttng_is_signed_type(__typeof__(_range_end)),                     \
 284                         .value = lttng_is_signed_type(__typeof__(_range_end)) ?                         \
 285                                 (long long) (_range_end) : (_range_end),                                \
 286                 },                                                                                      \
 287                 .string = (_string),                                                                    \
 288         }),
 289
 290 #define lttng_kernel_static_enum_entry_auto(_string)                                                    \
 291         __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, {                                \
 292                 .start = {                                                                              \
 293                         .signedness = -1,                                                               \
 294                         .value = -1,                                                                    \
 295                 },                                                                                      \
 296                 .end = {                                                                                \
 297                         .signedness = -1,                                                               \
 298                         .value = -1,                                                                    \
 299                 },                                                                                      \
 300                 .string = (_string),                                                                    \
 301                 .options = {                                                                            \
 302                         .is_auto = 1,                                                                   \
 303                 }                                                                                       \
 304         }),
 305
 306 union lttng_ctx_value {
 307         int64_t s64;
 308         const char *str;
 309         double d;
 310 };
 311
 312 /*
 313  * We need to keep this perf counter field separately from struct
 314  * lttng_kernel_ctx_field because cpu hotplug needs fixed-location addresses.
 315  */
 316 struct lttng_perf_counter_field {
 317 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
 318         struct lttng_cpuhp_node cpuhp_prepare;
 319         struct lttng_cpuhp_node cpuhp_online;
 320 #else
 321         struct notifier_block nb;
 322         int hp_enable;
 323 #endif
 324         struct perf_event_attr *attr;
 325         struct perf_event **e;  /* per-cpu array */
 326         char *name;
 327         struct lttng_kernel_event_field *event_field;
 328 };
 329
 330 struct lttng_probe_ctx {
 331         struct lttng_kernel_event_common *event;
 332         uint8_t interruptible;
 333 };
 334
 335 struct lttng_kernel_ctx_field {
 336         const struct lttng_kernel_event_field *event_field;
 337         size_t (*get_size)(size_t offset);
 338         size_t (*get_size_arg)(size_t offset, struct lttng_kernel_ctx_field *field,
 339                                struct lib_ring_buffer_ctx *ctx,
 340                                struct lttng_channel *chan);
 341         void (*record)(struct lttng_kernel_ctx_field *field,
 342                        struct lib_ring_buffer_ctx *ctx,
 343                        struct lttng_channel *chan);
 344         void (*get_value)(struct lttng_kernel_ctx_field *field,
 345                          struct lttng_probe_ctx *lttng_probe_ctx,
 346                          union lttng_ctx_value *value);
 347         void (*destroy)(struct lttng_kernel_ctx_field *field);
 348         void *priv;
 349 };
 350
 351 struct lttng_kernel_ctx {
 352         struct lttng_kernel_ctx_field *fields;
 353         unsigned int nr_fields;
 354         unsigned int allocated_fields;
 355         size_t largest_align;   /* in bytes */
 356 };
 357
 358 struct lttng_kernel_event_desc {
 359         const char *event_name;         /* lttng-modules name */
 360         const char *event_kname;        /* Linux kernel name (tracepoints) */
 361         const struct lttng_kernel_probe_desc *probe_desc;
 362         void (*probe_callback)(void);
 363         const struct lttng_kernel_event_field **fields; /* event payload */
 364         unsigned int nr_fields;
 365         struct module *owner;
 366 };
 367
 368 struct lttng_kernel_probe_desc {
 369         const char *provider_name;
 370         const struct lttng_kernel_event_desc **event_desc;
 371         unsigned int nr_events;
 372         struct list_head head;                  /* chain registered probes */
 373         struct list_head lazy_init_head;
 374         int lazy;                               /* lazy registration */
 375 };
 376
 377 struct lttng_krp;                               /* Kretprobe handling */
 378
 379 enum lttng_kernel_bytecode_type {
 380         LTTNG_KERNEL_BYTECODE_TYPE_FILTER,
 381         LTTNG_KERNEL_BYTECODE_TYPE_CAPTURE,
 382 };
 383
 384 struct lttng_bytecode_node {
 385         enum lttng_kernel_bytecode_type type;
 386         struct list_head node;
 387         struct lttng_enabler *enabler;
 388         struct {
 389                 uint32_t len;
 390                 uint32_t reloc_offset;
 391                 uint64_t seqnum;
 392                 char data[];
 393         } bc;
 394 };
 395
 396 struct lttng_interpreter_output;
 397
 398 struct lttng_bytecode_runtime {
 399         /* Associated bytecode */
 400         enum lttng_kernel_bytecode_type type;
 401         struct lttng_bytecode_node *bc;
 402         int (*interpreter_func)(struct lttng_bytecode_runtime *kernel_bytecode,
 403                                 const char *interpreter_stack_data,
 404                                 struct lttng_probe_ctx *lttng_probe_ctx,
 405                                 void *caller_ctx);
 406         int link_failed;
 407         struct list_head node;  /* list of bytecode runtime in event */
 408         struct lttng_kernel_ctx *ctx;
 409 };
 410
 411 /*
 412  * Objects in a linked-list of enablers, owned by an event.
 413  */
 414 struct lttng_enabler_ref {
 415         struct list_head node;                  /* enabler ref list */
 416         struct lttng_enabler *ref;              /* backward ref */
 417 };
 418
 419 struct lttng_uprobe_handler {
 420         struct lttng_kernel_event_common *event;
 421         loff_t offset;
 422         struct uprobe_consumer up_consumer;
 423         struct list_head node;
 424 };
 425
 426 struct lttng_kprobe {
 427         struct kprobe kp;
 428         char *symbol_name;
 429 };
 430
 431 struct lttng_uprobe {
 432         struct inode *inode;
 433         struct list_head head;
 434 };
 435
 436 enum lttng_syscall_entryexit {
 437         LTTNG_SYSCALL_ENTRY,
 438         LTTNG_SYSCALL_EXIT,
 439 };
 440
 441 enum lttng_syscall_abi {
 442         LTTNG_SYSCALL_ABI_NATIVE,
 443         LTTNG_SYSCALL_ABI_COMPAT,
 444 };
 445
 446 /*
 447  * Result of the run_filter() callback.
 448  */
 449 enum lttng_kernel_event_filter_result {
 450         LTTNG_KERNEL_EVENT_FILTER_ACCEPT = 0,
 451         LTTNG_KERNEL_EVENT_FILTER_REJECT = 1,
 452 };
 453
 454 struct lttng_kernel_event_common_private;
 455
 456 enum lttng_kernel_event_type {
 457         LTTNG_KERNEL_EVENT_TYPE_RECORDER = 0,
 458         LTTNG_KERNEL_EVENT_TYPE_NOTIFIER = 1,
 459 };
 460
 461 struct lttng_kernel_event_common {
 462         struct lttng_kernel_event_common_private *priv; /* Private event interface */
 463
 464         enum lttng_kernel_event_type type;
 465         /* Get child with container_of(). */
 466
 467         int enabled;
 468         int eval_filter;                                /* Need to evaluate filters */
 469         int (*run_filter)(const struct lttng_kernel_event_common *event,
 470                 const char *stack_data,
 471                 struct lttng_probe_ctx *probe_ctx,
 472                 void *filter_ctx);
 473 };
 474
 475 struct lttng_kernel_event_recorder_private;
 476
 477 struct lttng_kernel_event_recorder {
 478         struct lttng_kernel_event_common parent;
 479         struct lttng_kernel_event_recorder_private *priv;       /* Private event record interface */
 480
 481         struct lttng_channel *chan;
 482 };
 483
 484 struct lttng_kernel_notification_ctx {
 485         int eval_capture;                                       /* Capture evaluation available. */
 486 };
 487
 488 struct lttng_kernel_event_notifier_private;
 489
 490 struct lttng_kernel_event_notifier {
 491         struct lttng_kernel_event_common parent;
 492         struct lttng_kernel_event_notifier_private *priv;       /* Private event notifier interface */
 493
 494         int eval_capture;                               /* Need to evaluate capture */
 495         void (*notification_send)(struct lttng_kernel_event_notifier *event_notifier,
 496                 const char *stack_data,
 497                 struct lttng_probe_ctx *probe_ctx,
 498                 struct lttng_kernel_notification_ctx *notif_ctx);
 499 };
 500
 501 enum lttng_enabler_format_type {
 502         LTTNG_ENABLER_FORMAT_STAR_GLOB,
 503         LTTNG_ENABLER_FORMAT_NAME,
 504 };
 505
 506 /*
 507  * Enabler field, within whatever object is enabling an event. Target of
 508  * backward reference.
 509  */
 510 struct lttng_enabler {
 511         enum lttng_enabler_format_type format_type;
 512
 513         /* head list of struct lttng_bytecode_node */
 514         struct list_head filter_bytecode_head;
 515
 516         struct lttng_kernel_abi_event event_param;
 517         unsigned int enabled:1;
 518
 519         uint64_t user_token;            /* User-provided token. */
 520 };
 521
 522 struct lttng_event_enabler {
 523         struct lttng_enabler base;
 524         struct list_head node;  /* per-session list of enablers */
 525         struct lttng_channel *chan;
 526 };
 527
 528 struct lttng_event_notifier_enabler {
 529         struct lttng_enabler base;
 530         uint64_t error_counter_index;
 531         struct list_head node;  /* List of event_notifier enablers */
 532         struct lttng_event_notifier_group *group;
 533
 534         /* head list of struct lttng_bytecode_node */
 535         struct list_head capture_bytecode_head;
 536         uint64_t num_captures;
 537 };
 538
 539
 540 static inline
 541 struct lttng_enabler *lttng_event_enabler_as_enabler(
 542                 struct lttng_event_enabler *event_enabler)
 543 {
 544         return &event_enabler->base;
 545 }
 546
 547 static inline
 548 struct lttng_enabler *lttng_event_notifier_enabler_as_enabler(
 549                 struct lttng_event_notifier_enabler *event_notifier_enabler)
 550 {
 551         return &event_notifier_enabler->base;
 552 }
 553
 554 struct lttng_channel_ops {
 555         struct channel *(*channel_create)(const char *name,
 556                                 void *priv,
 557                                 void *buf_addr,
 558                                 size_t subbuf_size, size_t num_subbuf,
 559                                 unsigned int switch_timer_interval,
 560                                 unsigned int read_timer_interval);
 561         void (*channel_destroy)(struct channel *chan);
 562         struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
 563         int (*buffer_has_read_closed_stream)(struct channel *chan);
 564         void (*buffer_read_close)(struct lib_ring_buffer *buf);
 565         int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
 566                              uint32_t event_id);
 567         void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
 568         void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
 569                             size_t len);
 570         void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
 571                                       const void *src, size_t len);
 572         void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
 573                              int c, size_t len);
 574         void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
 575                              size_t len);
 576         void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
 577                                        const char __user *src, size_t len);
 578         /*
 579          * packet_avail_size returns the available size in the current
 580          * packet. Note that the size returned is only a hint, since it
 581          * may change due to concurrent writes.
 582          */
 583         size_t (*packet_avail_size)(struct channel *chan);
 584         wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
 585         wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
 586         int (*is_finalized)(struct channel *chan);
 587         int (*is_disabled)(struct channel *chan);
 588         int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
 589                         struct lib_ring_buffer *bufb,
 590                         uint64_t *timestamp_begin);
 591         int (*timestamp_end) (const struct lib_ring_buffer_config *config,
 592                         struct lib_ring_buffer *bufb,
 593                         uint64_t *timestamp_end);
 594         int (*events_discarded) (const struct lib_ring_buffer_config *config,
 595                         struct lib_ring_buffer *bufb,
 596                         uint64_t *events_discarded);
 597         int (*content_size) (const struct lib_ring_buffer_config *config,
 598                         struct lib_ring_buffer *bufb,
 599                         uint64_t *content_size);
 600         int (*packet_size) (const struct lib_ring_buffer_config *config,
 601                         struct lib_ring_buffer *bufb,
 602                         uint64_t *packet_size);
 603         int (*stream_id) (const struct lib_ring_buffer_config *config,
 604                         struct lib_ring_buffer *bufb,
 605                         uint64_t *stream_id);
 606         int (*current_timestamp) (const struct lib_ring_buffer_config *config,
 607                         struct lib_ring_buffer *bufb,
 608                         uint64_t *ts);
 609         int (*sequence_number) (const struct lib_ring_buffer_config *config,
 610                         struct lib_ring_buffer *bufb,
 611                         uint64_t *seq);
 612         int (*instance_id) (const struct lib_ring_buffer_config *config,
 613                         struct lib_ring_buffer *bufb,
 614                         uint64_t *id);
 615 };
 616
 617 struct lttng_counter_ops {
 618         struct lib_counter *(*counter_create)(size_t nr_dimensions,
 619                         const size_t *max_nr_elem,      /* for each dimension */
 620                         int64_t global_sum_step);
 621         void (*counter_destroy)(struct lib_counter *counter);
 622         int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
 623                         int64_t v);
 624         /*
 625          * counter_read reads a specific cpu's counter if @cpu >= 0, or
 626          * the global aggregation counter if @cpu == -1.
 627          */
 628         int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
 629                          int64_t *value, bool *overflow, bool *underflow);
 630         /*
 631          * counter_aggregate returns the total sum of all per-cpu counters and
 632          * the global aggregation counter.
 633          */
 634         int (*counter_aggregate)(struct lib_counter *counter, const size_t *dimension_indexes,
 635                         int64_t *value, bool *overflow, bool *underflow);
 636         int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
 637 };
 638
 639 struct lttng_transport {
 640         char *name;
 641         struct module *owner;
 642         struct list_head node;
 643         struct lttng_channel_ops ops;
 644 };
 645
 646 struct lttng_counter_transport {
 647         char *name;
 648         struct module *owner;
 649         struct list_head node;
 650         struct lttng_counter_ops ops;
 651 };
 652
 653 struct lttng_syscall_filter;
 654
 655 #define LTTNG_EVENT_HT_BITS             12
 656 #define LTTNG_EVENT_HT_SIZE             (1U << LTTNG_EVENT_HT_BITS)
 657
 658 struct lttng_event_ht {
 659         struct hlist_head table[LTTNG_EVENT_HT_SIZE];
 660 };
 661
 662 #define LTTNG_EVENT_NOTIFIER_HT_BITS            12
 663 #define LTTNG_EVENT_NOTIFIER_HT_SIZE            (1U << LTTNG_EVENT_NOTIFIER_HT_BITS)
 664
 665 struct lttng_event_notifier_ht {
 666         struct hlist_head table[LTTNG_EVENT_NOTIFIER_HT_SIZE];
 667 };
 668
 669 struct lttng_channel {
 670         unsigned int id;
 671         struct channel *chan;           /* Channel buffers */
 672         int enabled;
 673         struct lttng_kernel_ctx *ctx;
 674         /* Event ID management */
 675         struct lttng_session *session;
 676         struct file *file;              /* File associated to channel */
 677         unsigned int free_event_id;     /* Next event ID to allocate */
 678         struct list_head list;          /* Channel list */
 679         struct lttng_channel_ops *ops;
 680         struct lttng_transport *transport;
 681         struct hlist_head *sc_table;    /* for syscall tracing */
 682         struct hlist_head *compat_sc_table;
 683         struct hlist_head *sc_exit_table;       /* for syscall exit tracing */
 684         struct hlist_head *compat_sc_exit_table;
 685         struct hlist_head sc_unknown;   /* for unknown syscalls */
 686         struct hlist_head sc_compat_unknown;
 687         struct hlist_head sc_exit_unknown;
 688         struct hlist_head compat_sc_exit_unknown;
 689         struct lttng_syscall_filter *sc_filter;
 690         int header_type;                /* 0: unset, 1: compact, 2: large */
 691         enum channel_type channel_type;
 692         int syscall_all_entry;
 693         int syscall_all_exit;
 694         unsigned int metadata_dumped:1,
 695                 sys_enter_registered:1,
 696                 sys_exit_registered:1,
 697                 tstate:1;               /* Transient enable state */
 698 };
 699
 700 struct lttng_metadata_stream {
 701         void *priv;                     /* Ring buffer private data */
 702         struct lttng_metadata_cache *metadata_cache;
 703         unsigned int metadata_in;       /* Bytes read from the cache */
 704         unsigned int metadata_out;      /* Bytes consumed from stream */
 705         int finalized;                  /* Has channel been finalized */
 706         wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
 707         struct list_head list;          /* Stream list */
 708         struct lttng_transport *transport;
 709         uint64_t version;               /* Current version of the metadata cache */
 710         bool coherent;                  /* Stream in a coherent state */
 711 };
 712
 713 #define LTTNG_DYNAMIC_LEN_STACK_SIZE    128
 714
 715 struct lttng_dynamic_len_stack {
 716         size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
 717         size_t offset;
 718 };
 719
 720 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
 721
 722 /*
 723  * struct lttng_id_tracker declared in header due to deferencing of *v
 724  * in RCU_INITIALIZER(v).
 725  */
 726 #define LTTNG_ID_HASH_BITS      6
 727 #define LTTNG_ID_TABLE_SIZE     (1 << LTTNG_ID_HASH_BITS)
 728
 729 enum tracker_type {
 730         TRACKER_PID,
 731         TRACKER_VPID,
 732         TRACKER_UID,
 733         TRACKER_VUID,
 734         TRACKER_GID,
 735         TRACKER_VGID,
 736
 737         TRACKER_UNKNOWN,
 738 };
 739
 740 struct lttng_id_tracker_rcu {
 741         struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE];
 742 };
 743
 744 struct lttng_id_tracker {
 745         struct lttng_session *session;
 746         enum tracker_type tracker_type;
 747         struct lttng_id_tracker_rcu *p; /* RCU dereferenced. */
 748 };
 749
 750 struct lttng_id_hash_node {
 751         struct hlist_node hlist;
 752         int id;
 753 };
 754
 755 struct lttng_session {
 756         int active;                     /* Is trace session active ? */
 757         int been_active;                /* Has trace session been active ? */
 758         struct file *file;              /* File associated to session */
 759         struct list_head chan;          /* Channel list head */
 760         struct list_head events;        /* Event list head */
 761         struct list_head list;          /* Session list */
 762         unsigned int free_chan_id;      /* Next chan ID to allocate */
 763         uuid_le uuid;                   /* Trace session unique ID */
 764         struct lttng_metadata_cache *metadata_cache;
 765         struct lttng_id_tracker pid_tracker;
 766         struct lttng_id_tracker vpid_tracker;
 767         struct lttng_id_tracker uid_tracker;
 768         struct lttng_id_tracker vuid_tracker;
 769         struct lttng_id_tracker gid_tracker;
 770         struct lttng_id_tracker vgid_tracker;
 771         unsigned int metadata_dumped:1,
 772                 tstate:1;               /* Transient enable state */
 773         /* List of event enablers */
 774         struct list_head enablers_head;
 775         /* Hash table of events */
 776         struct lttng_event_ht events_ht;
 777         char name[LTTNG_KERNEL_ABI_SESSION_NAME_LEN];
 778         char creation_time[LTTNG_KERNEL_ABI_SESSION_CREATION_TIME_ISO8601_LEN];
 779 };
 780
 781 struct lttng_counter {
 782         struct file *file;              /* File associated to counter. */
 783         struct file *owner;
 784         struct lttng_counter_transport *transport;
 785         struct lib_counter *counter;
 786         struct lttng_counter_ops *ops;
 787 };
 788
 789 struct lttng_event_notifier_group {
 790         struct file *file;              /* File associated to event notifier group */
 791         struct file *notif_file;        /* File used to expose notifications to userspace. */
 792         struct list_head node;          /* event notifier group list */
 793         struct list_head enablers_head; /* List of enablers */
 794         struct list_head event_notifiers_head; /* List of event notifier */
 795         struct lttng_event_notifier_ht event_notifiers_ht; /* Hash table of event notifiers */
 796         struct lttng_channel_ops *ops;
 797         struct lttng_transport *transport;
 798         struct channel *chan;           /* Ring buffer channel for event notifier group. */
 799         struct lib_ring_buffer *buf;    /* Ring buffer for event notifier group. */
 800         wait_queue_head_t read_wait;
 801         struct irq_work wakeup_pending; /* Pending wakeup irq work. */
 802         struct lttng_kernel_event_notifier *sc_unknown; /* for unknown syscalls */
 803         struct lttng_kernel_event_notifier *sc_compat_unknown;
 804
 805         struct lttng_syscall_filter *sc_filter;
 806
 807         struct hlist_head *event_notifier_syscall_dispatch;
 808         struct hlist_head *event_notifier_compat_syscall_dispatch;
 809         struct hlist_head *event_notifier_exit_syscall_dispatch;
 810         struct hlist_head *event_notifier_exit_compat_syscall_dispatch;
 811
 812         struct hlist_head event_notifier_unknown_syscall_dispatch;
 813         struct hlist_head event_notifier_compat_unknown_syscall_dispatch;
 814         struct hlist_head event_notifier_exit_unknown_syscall_dispatch;
 815         struct hlist_head event_notifier_exit_compat_unknown_syscall_dispatch;
 816
 817         int syscall_all_entry;
 818         int syscall_all_exit;
 819
 820         unsigned int sys_enter_registered:1, sys_exit_registered:1;
 821
 822         struct lttng_counter *error_counter;
 823         size_t error_counter_len;
 824 };
 825
 826 struct lttng_metadata_cache {
 827         char *data;                     /* Metadata cache */
 828         unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
 829         unsigned int metadata_written;  /* Number of bytes written in metadata cache */
 830         atomic_t producing;             /* Metadata being produced (incomplete) */
 831         struct kref refcount;           /* Metadata cache usage */
 832         struct list_head metadata_stream;       /* Metadata stream list */
 833         uuid_le uuid;                   /* Trace session unique ID (copy) */
 834         struct mutex lock;              /* Produce/consume lock */
 835         uint64_t version;               /* Current version of the metadata */
 836 };
 837
 838 void lttng_lock_sessions(void);
 839 void lttng_unlock_sessions(void);
 840
 841 struct list_head *lttng_get_probe_list_head(void);
 842
 843 struct lttng_event_enabler *lttng_event_enabler_create(
 844                 enum lttng_enabler_format_type format_type,
 845                 struct lttng_kernel_abi_event *event_param,
 846                 struct lttng_channel *chan);
 847
 848 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler);
 849 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler);
 850 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 851                 struct lttng_event_notifier_group *event_notifier_group,
 852                 enum lttng_enabler_format_type format_type,
 853                 struct lttng_kernel_abi_event_notifier *event_notifier_param);
 854
 855 int lttng_event_notifier_enabler_enable(
 856                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 857 int lttng_event_notifier_enabler_disable(
 858                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 859 int lttng_fix_pending_events(void);
 860 int lttng_fix_pending_event_notifiers(void);
 861 int lttng_session_active(void);
 862 bool lttng_event_notifier_active(void);
 863
 864 struct lttng_session *lttng_session_create(void);
 865 int lttng_session_enable(struct lttng_session *session);
 866 int lttng_session_disable(struct lttng_session *session);
 867 void lttng_session_destroy(struct lttng_session *session);
 868 int lttng_session_metadata_regenerate(struct lttng_session *session);
 869 int lttng_session_statedump(struct lttng_session *session);
 870 void metadata_cache_destroy(struct kref *kref);
 871
 872 struct lttng_counter *lttng_kernel_counter_create(
 873                 const char *counter_transport_name, size_t number_dimensions,
 874                 const size_t *dimensions_sizes);
 875 int lttng_kernel_counter_read(struct lttng_counter *counter,
 876                 const size_t *dimension_indexes, int32_t cpu,
 877                 int64_t *val, bool *overflow, bool *underflow);
 878 int lttng_kernel_counter_aggregate(struct lttng_counter *counter,
 879                 const size_t *dimension_indexes, int64_t *val,
 880                 bool *overflow, bool *underflow);
 881 int lttng_kernel_counter_clear(struct lttng_counter *counter,
 882                 const size_t *dimension_indexes);
 883
 884
 885 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void);
 886 int lttng_event_notifier_group_create_error_counter(
 887                 struct file *event_notifier_group_file,
 888                 const struct lttng_kernel_abi_counter_conf *error_counter_conf);
 889 void lttng_event_notifier_group_destroy(
 890                 struct lttng_event_notifier_group *event_notifier_group);
 891
 892 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
 893                                        const char *transport_name,
 894                                        void *buf_addr,
 895                                        size_t subbuf_size, size_t num_subbuf,
 896                                        unsigned int switch_timer_interval,
 897                                        unsigned int read_timer_interval,
 898                                        enum channel_type channel_type);
 899 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
 900                                        int overwrite, void *buf_addr,
 901                                        size_t subbuf_size, size_t num_subbuf,
 902                                        unsigned int switch_timer_interval,
 903                                        unsigned int read_timer_interval);
 904
 905 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 906 struct lttng_kernel_event_recorder *lttng_kernel_event_recorder_create(struct lttng_channel *chan,
 907                                 struct lttng_kernel_abi_event *event_param,
 908                                 const struct lttng_kernel_event_desc *event_desc,
 909                                 enum lttng_kernel_abi_instrumentation itype);
 910 struct lttng_kernel_event_recorder *_lttng_kernel_event_recorder_create(struct lttng_channel *chan,
 911                                 struct lttng_kernel_abi_event *event_param,
 912                                 const struct lttng_kernel_event_desc *event_desc,
 913                                 enum lttng_kernel_abi_instrumentation itype);
 914 struct lttng_kernel_event_recorder *lttng_event_compat_old_create(struct lttng_channel *chan,
 915                 struct lttng_kernel_abi_old_event *old_event_param,
 916                 const struct lttng_kernel_event_desc *internal_desc);
 917
 918 struct lttng_kernel_event_notifier *lttng_event_notifier_create(
 919                                 const struct lttng_kernel_event_desc *event_notifier_desc,
 920                                 uint64_t id,
 921                                 uint64_t error_counter_idx,
 922                                 struct lttng_event_notifier_group *event_notifier_group,
 923                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
 924                                 enum lttng_kernel_abi_instrumentation itype);
 925 struct lttng_kernel_event_notifier *_lttng_event_notifier_create(
 926                                 const struct lttng_kernel_event_desc *event_notifier_desc,
 927                                 uint64_t id,
 928                                 uint64_t error_counter_idx,
 929                                 struct lttng_event_notifier_group *event_notifier_group,
 930                                 struct lttng_kernel_abi_event_notifier *event_notifier_param,
 931                                 enum lttng_kernel_abi_instrumentation itype);
 932
 933 int lttng_channel_enable(struct lttng_channel *channel);
 934 int lttng_channel_disable(struct lttng_channel *channel);
 935 int lttng_event_enable(struct lttng_kernel_event_common *event);
 936 int lttng_event_disable(struct lttng_kernel_event_common *event);
 937
 938 void lttng_transport_register(struct lttng_transport *transport);
 939 void lttng_transport_unregister(struct lttng_transport *transport);
 940
 941 void lttng_counter_transport_register(struct lttng_counter_transport *transport);
 942 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
 943
 944 void synchronize_trace(void);
 945 int lttng_abi_init(void);
 946 int lttng_abi_compat_old_init(void);
 947 void lttng_abi_exit(void);
 948 void lttng_abi_compat_old_exit(void);
 949
 950 int lttng_probe_register(struct lttng_kernel_probe_desc *desc);
 951 void lttng_probe_unregister(struct lttng_kernel_probe_desc *desc);
 952 const struct lttng_kernel_event_desc *lttng_event_desc_get(const char *name);
 953 void lttng_event_desc_put(const struct lttng_kernel_event_desc *desc);
 954 int lttng_probes_init(void);
 955 void lttng_probes_exit(void);
 956
 957 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
 958                 struct channel *chan, bool *coherent);
 959
 960 int lttng_id_tracker_get_node_id(const struct lttng_id_hash_node *node);
 961 int lttng_id_tracker_empty_set(struct lttng_id_tracker *lf);
 962 void lttng_id_tracker_destroy(struct lttng_id_tracker *lf, bool rcu);
 963 bool lttng_id_tracker_lookup(struct lttng_id_tracker_rcu *p, int id);
 964 int lttng_id_tracker_add(struct lttng_id_tracker *lf, int id);
 965 int lttng_id_tracker_del(struct lttng_id_tracker *lf, int id);
 966
 967 int lttng_session_track_id(struct lttng_session *session,
 968                 enum tracker_type tracker_type, int id);
 969 int lttng_session_untrack_id(struct lttng_session *session,
 970                 enum tracker_type tracker_type, int id);
 971
 972 int lttng_session_list_tracker_ids(struct lttng_session *session,
 973                 enum tracker_type tracker_type);
 974
 975 void lttng_clock_ref(void);
 976 void lttng_clock_unref(void);
 977
 978 int lttng_desc_match_enabler(const struct lttng_kernel_event_desc *desc,
 979                 struct lttng_enabler *enabler);
 980
 981 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 982 int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler);
 983 int lttng_syscalls_unregister_channel(struct lttng_channel *chan);
 984 int lttng_syscalls_destroy_event(struct lttng_channel *chan);
 985 int lttng_syscall_filter_enable_event(
 986                 struct lttng_channel *chan,
 987                 struct lttng_kernel_event_recorder *event);
 988 int lttng_syscall_filter_disable_event(
 989                 struct lttng_channel *chan,
 990                 struct lttng_kernel_event_recorder *event);
 991
 992 long lttng_channel_syscall_mask(struct lttng_channel *channel,
 993                 struct lttng_kernel_abi_syscall_mask __user *usyscall_mask);
 994
 995 int lttng_syscalls_register_event_notifier(
 996                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 997 int lttng_syscalls_create_matching_event_notifiers(
 998                 struct lttng_event_notifier_enabler *event_notifier_enabler);
 999 int lttng_syscalls_unregister_event_notifier_group(struct lttng_event_notifier_group *group);
1000 int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
1001 int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
1002 #else
1003 static inline int lttng_syscalls_register_event(
1004                 struct lttng_event_enabler *event_enabler)
1005 {
1006         return -ENOSYS;
1007 }
1008
1009 static inline int lttng_syscalls_unregister_channel(struct lttng_channel *chan)
1010 {
1011         return 0;
1012 }
1013
1014 static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
1015 {
1016         return 0;
1017 }
1018
1019 static inline int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
1020                 struct lttng_kernel_event_recorder *event);
1021 {
1022         return -ENOSYS;
1023 }
1024
1025 static inline int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
1026                 struct lttng_kernel_event_recorder *event);
1027 {
1028         return -ENOSYS;
1029 }
1030
1031 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
1032                 struct lttng_kernel_syscall_mask __user *usyscall_mask)
1033 {
1034         return -ENOSYS;
1035 }
1036
1037 static inline int lttng_syscalls_register_event_notifier(
1038                 struct lttng_event_notifier_group *group)
1039 {
1040         return -ENOSYS;
1041 }
1042
1043 static inline int lttng_syscalls_unregister_event_notifier_group(
1044                 struct lttng_event_notifier_group *group)
1045 {
1046         return 0;
1047 }
1048
1049 static inline int lttng_syscall_filter_enable_event_notifier(
1050                 struct lttng_event_notifier_group *group,
1051                 const char *name)
1052 {
1053         return -ENOSYS;
1054 }
1055
1056 static inline int lttng_syscall_filter_disable_event_notifier(
1057                 struct lttng_event_notifier_group *group,
1058                 const char *name)
1059 {
1060         return -ENOSYS;
1061 }
1062
1063 #endif
1064
1065 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
1066                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
1067 int lttng_event_notifier_enabler_attach_filter_bytecode(
1068                 struct lttng_event_notifier_enabler *event_notifier_enabler,
1069                 struct lttng_kernel_abi_filter_bytecode __user *bytecode);
1070 int lttng_event_notifier_enabler_attach_capture_bytecode(
1071                 struct lttng_event_notifier_enabler *event_notifier_enabler,
1072                 struct lttng_kernel_abi_capture_bytecode __user *bytecode);
1073
1074 void lttng_enabler_link_bytecode(const struct lttng_kernel_event_desc *event_desc,
1075                 struct lttng_kernel_ctx *ctx,
1076                 struct list_head *instance_bytecode_runtime_head,
1077                 struct list_head *enabler_bytecode_runtime_head);
1078 void lttng_free_event_filter_runtime(struct lttng_kernel_event_common *event);
1079
1080 int lttng_probes_init(void);
1081
1082 extern struct lttng_kernel_ctx *lttng_static_ctx;
1083
1084 int lttng_context_init(void);
1085 void lttng_context_exit(void);
1086 int lttng_kernel_context_append(struct lttng_kernel_ctx **ctx_p,
1087                 const struct lttng_kernel_ctx_field *f);
1088 void lttng_kernel_context_remove_last(struct lttng_kernel_ctx **ctx_p);
1089 struct lttng_kernel_ctx_field *lttng_kernel_get_context_field_from_index(struct lttng_kernel_ctx *ctx,
1090                 size_t index);
1091 int lttng_kernel_find_context(struct lttng_kernel_ctx *ctx, const char *name);
1092 int lttng_kernel_get_context_index(struct lttng_kernel_ctx *ctx, const char *name);
1093 void lttng_kernel_destroy_context(struct lttng_kernel_ctx *ctx);
1094 int lttng_add_pid_to_ctx(struct lttng_kernel_ctx **ctx);
1095 int lttng_add_cpu_id_to_ctx(struct lttng_kernel_ctx **ctx);
1096 int lttng_add_procname_to_ctx(struct lttng_kernel_ctx **ctx);
1097 int lttng_add_prio_to_ctx(struct lttng_kernel_ctx **ctx);
1098 int lttng_add_nice_to_ctx(struct lttng_kernel_ctx **ctx);
1099 int lttng_add_vpid_to_ctx(struct lttng_kernel_ctx **ctx);
1100 int lttng_add_tid_to_ctx(struct lttng_kernel_ctx **ctx);
1101 int lttng_add_vtid_to_ctx(struct lttng_kernel_ctx **ctx);
1102 int lttng_add_ppid_to_ctx(struct lttng_kernel_ctx **ctx);
1103 int lttng_add_vppid_to_ctx(struct lttng_kernel_ctx **ctx);
1104 int lttng_add_hostname_to_ctx(struct lttng_kernel_ctx **ctx);
1105 int lttng_add_interruptible_to_ctx(struct lttng_kernel_ctx **ctx);
1106 int lttng_add_need_reschedule_to_ctx(struct lttng_kernel_ctx **ctx);
1107 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
1108 int lttng_add_preemptible_to_ctx(struct lttng_kernel_ctx **ctx);
1109 #else
1110 static inline
1111 int lttng_add_preemptible_to_ctx(struct lttng_kernel_ctx **ctx)
1112 {
1113         return -ENOSYS;
1114 }
1115 #endif
1116 #ifdef CONFIG_PREEMPT_RT_FULL
1117 int lttng_add_migratable_to_ctx(struct lttng_kernel_ctx **ctx);
1118 #else
1119 static inline
1120 int lttng_add_migratable_to_ctx(struct lttng_kernel_ctx **ctx)
1121 {
1122         return -ENOSYS;
1123 }
1124 #endif
1125
1126 int lttng_add_callstack_to_ctx(struct lttng_kernel_ctx **ctx, int type);
1127
1128 #if defined(CONFIG_CGROUPS) && \
1129         ((LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) || \
1130          LTTNG_UBUNTU_KERNEL_RANGE(4,4,0,0, 4,5,0,0))
1131 int lttng_add_cgroup_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1132 #else
1133 static inline
1134 int lttng_add_cgroup_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1135 {
1136         return -ENOSYS;
1137 }
1138 #endif
1139
1140 #if defined(CONFIG_IPC_NS) && \
1141         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1142 int lttng_add_ipc_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1143 #else
1144 static inline
1145 int lttng_add_ipc_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1146 {
1147         return -ENOSYS;
1148 }
1149 #endif
1150
1151 #if !defined(LTTNG_MNT_NS_MISSING_HEADER) && \
1152         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1153 int lttng_add_mnt_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1154 #else
1155 static inline
1156 int lttng_add_mnt_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1157 {
1158         return -ENOSYS;
1159 }
1160 #endif
1161
1162 #if defined(CONFIG_NET_NS) && \
1163         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1164 int lttng_add_net_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1165 #else
1166 static inline
1167 int lttng_add_net_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1168 {
1169         return -ENOSYS;
1170 }
1171 #endif
1172
1173 #if defined(CONFIG_PID_NS) && \
1174         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1175 int lttng_add_pid_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1176 #else
1177 static inline
1178 int lttng_add_pid_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1179 {
1180         return -ENOSYS;
1181 }
1182 #endif
1183
1184 #if defined(CONFIG_USER_NS) && \
1185         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1186 int lttng_add_user_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1187 #else
1188 static inline
1189 int lttng_add_user_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1190 {
1191         return -ENOSYS;
1192 }
1193 #endif
1194
1195 #if defined(CONFIG_UTS_NS) && \
1196         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,8,0))
1197 int lttng_add_uts_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1198 #else
1199 static inline
1200 int lttng_add_uts_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1201 {
1202         return -ENOSYS;
1203 }
1204 #endif
1205
1206 #if defined(CONFIG_TIME_NS) && \
1207         (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
1208 int lttng_add_time_ns_to_ctx(struct lttng_kernel_ctx **ctx);
1209 #else
1210 static inline
1211 int lttng_add_time_ns_to_ctx(struct lttng_kernel_ctx **ctx)
1212 {
1213         return -ENOSYS;
1214 }
1215 #endif
1216
1217 int lttng_add_uid_to_ctx(struct lttng_kernel_ctx **ctx);
1218 int lttng_add_euid_to_ctx(struct lttng_kernel_ctx **ctx);
1219 int lttng_add_suid_to_ctx(struct lttng_kernel_ctx **ctx);
1220 int lttng_add_gid_to_ctx(struct lttng_kernel_ctx **ctx);
1221 int lttng_add_egid_to_ctx(struct lttng_kernel_ctx **ctx);
1222 int lttng_add_sgid_to_ctx(struct lttng_kernel_ctx **ctx);
1223 int lttng_add_vuid_to_ctx(struct lttng_kernel_ctx **ctx);
1224 int lttng_add_veuid_to_ctx(struct lttng_kernel_ctx **ctx);
1225 int lttng_add_vsuid_to_ctx(struct lttng_kernel_ctx **ctx);
1226 int lttng_add_vgid_to_ctx(struct lttng_kernel_ctx **ctx);
1227 int lttng_add_vegid_to_ctx(struct lttng_kernel_ctx **ctx);
1228 int lttng_add_vsgid_to_ctx(struct lttng_kernel_ctx **ctx);
1229
1230 #if defined(CONFIG_PERF_EVENTS)
1231 int lttng_add_perf_counter_to_ctx(uint32_t type,
1232                                   uint64_t config,
1233                                   const char *name,
1234                                   struct lttng_kernel_ctx **ctx);
1235 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1236                 struct lttng_cpuhp_node *node);
1237 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1238                 struct lttng_cpuhp_node *node);
1239 #else
1240 static inline
1241 int lttng_add_perf_counter_to_ctx(uint32_t type,
1242                                   uint64_t config,
1243                                   const char *name,
1244                                   struct lttng_kernel_ctx **ctx)
1245 {
1246         return -ENOSYS;
1247 }
1248 static inline
1249 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
1250                 struct lttng_cpuhp_node *node)
1251 {
1252         return 0;
1253 }
1254 static inline
1255 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
1256                 struct lttng_cpuhp_node *node)
1257 {
1258         return 0;
1259 }
1260 #endif
1261
1262 int lttng_logger_init(void);
1263 void lttng_logger_exit(void);
1264
1265 extern int lttng_statedump_start(struct lttng_session *session);
1266
1267 #ifdef CONFIG_KPROBES
1268 int lttng_kprobes_register_event(const char *name,
1269                 const char *symbol_name,
1270                 uint64_t offset,
1271                 uint64_t addr,
1272                 struct lttng_kernel_event_recorder *event);
1273 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event);
1274 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
1275 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1276                 uint64_t offset,
1277                 uint64_t addr,
1278                 struct lttng_kernel_event_notifier *event_notifier);
1279 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
1280 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
1281 #else
1282 static inline
1283 int lttng_kprobes_register_event(const char *name,
1284                 const char *symbol_name,
1285                 uint64_t offset,
1286                 uint64_t addr,
1287                 struct lttng_kernel_event_recorder *event)
1288 {
1289         return -ENOSYS;
1290 }
1291
1292 static inline
1293 void lttng_kprobes_unregister_event(struct lttng_kernel_event_recorder *event)
1294 {
1295 }
1296
1297 static inline
1298 void lttng_kprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
1299 {
1300 }
1301
1302 static inline
1303 int lttng_kprobes_register_event_notifier(const char *symbol_name,
1304                 uint64_t offset,
1305                 uint64_t addr,
1306                 struct lttng_kernel_event_notifier *event_notifier)
1307 {
1308         return -ENOSYS;
1309 }
1310
1311 static inline
1312 void lttng_kprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1313 {
1314 }
1315
1316 static inline
1317 void lttng_kprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
1318 {
1319 }
1320 #endif
1321
1322 int lttng_event_add_callsite(struct lttng_kernel_event_common *event,
1323         struct lttng_kernel_abi_event_callsite __user *callsite);
1324
1325 #ifdef CONFIG_UPROBES
1326 int lttng_uprobes_register_event(const char *name,
1327         int fd, struct lttng_kernel_event_recorder *event);
1328 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
1329         struct lttng_kernel_abi_event_callsite __user *callsite);
1330 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event);
1331 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event);
1332 int lttng_uprobes_register_event_notifier(const char *name,
1333         int fd, struct lttng_kernel_event_notifier *event_notifier);
1334 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier);
1335 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier);
1336 #else
1337 static inline
1338 int lttng_uprobes_register_event(const char *name,
1339         int fd, struct lttng_kernel_event_recorder *event)
1340 {
1341         return -ENOSYS;
1342 }
1343
1344 static inline
1345 int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
1346         struct lttng_kernel_abi_event_callsite __user *callsite)
1347 {
1348         return -ENOSYS;
1349 }
1350
1351 static inline
1352 void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event)
1353 {
1354 }
1355
1356 static inline
1357 void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event)
1358 {
1359 }
1360
1361 static inline
1362 int lttng_uprobes_register_event_notifier(const char *name,
1363         int fd, struct lttng_kernel_event_notifier *event_notifier)
1364 {
1365         return -ENOSYS;
1366 }
1367
1368 static inline
1369 void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
1370 {
1371 }
1372
1373 static inline
1374 void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
1375 {
1376 }
1377 #endif
1378
1379 #ifdef CONFIG_KRETPROBES
1380 int lttng_kretprobes_register(const char *name,
1381                 const char *symbol_name,
1382                 uint64_t offset,
1383                 uint64_t addr,
1384                 struct lttng_kernel_event_recorder *event_entry,
1385                 struct lttng_kernel_event_recorder *event_exit);
1386 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event);
1387 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event);
1388 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1389         int enable);
1390 #else
1391 static inline
1392 int lttng_kretprobes_register(const char *name,
1393                 const char *symbol_name,
1394                 uint64_t offset,
1395                 uint64_t addr,
1396                 struct lttng_kernel_event_recorder *event_entry,
1397                 struct lttng_kernel_event_recorder *event_exit)
1398 {
1399         return -ENOSYS;
1400 }
1401
1402 static inline
1403 void lttng_kretprobes_unregister(struct lttng_kernel_event_recorder *event)
1404 {
1405 }
1406
1407 static inline
1408 void lttng_kretprobes_destroy_private(struct lttng_kernel_event_recorder *event)
1409 {
1410 }
1411
1412 static inline
1413 int lttng_kretprobes_event_enable_state(struct lttng_kernel_event_common *event,
1414         int enable)
1415 {
1416         return -ENOSYS;
1417 }
1418 #endif
1419
1420 int lttng_calibrate(struct lttng_kernel_abi_calibrate *calibrate);
1421
1422 extern const struct file_operations lttng_tracepoint_list_fops;
1423 extern const struct file_operations lttng_syscall_list_fops;
1424
1425 #define TRACEPOINT_HAS_DATA_ARG
1426
1427 #endif /* _LTTNG_EVENTS_H */