2 * SPDX-License-Identifier: MIT
4 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Holds LTTng per-session event registry.
9 #ifndef _LTTNG_UST_EVENTS_H
10 #define _LTTNG_UST_EVENTS_H
12 #include <urcu/list.h>
13 #include <urcu/hlist.h>
16 #include <lttng/ust-abi.h>
17 #include <lttng/ust-tracer.h>
18 #include <lttng/ust-endian.h>
25 #error "LTTNG_PACKED should be defined"
32 #define LTTNG_UST_UUID_LEN 16
35 * Tracepoint provider version. Compatibility based on the major number.
36 * Older tracepoint providers can always register to newer lttng-ust
37 * library, but the opposite is rejected: a newer tracepoint provider is
38 * rejected by an older lttng-ust library.
40 #define LTTNG_UST_PROVIDER_MAJOR 2
41 #define LTTNG_UST_PROVIDER_MINOR 0
45 struct lttng_ust_lib_ring_buffer_ctx
;
46 struct lttng_ust_event_field
;
47 struct lttng_event_notifier_group
;
50 * Data structures used by tracepoint event declarations, and by the
51 * tracer. Those structures have padding for future extension.
54 /* Type description */
56 /* Update the astract_types name table in lttng-types.c along with this enum */
57 enum lttng_abstract_types
{
64 atype_sequence_nestable
,
65 atype_struct_nestable
,
69 /* Update the string_encodings name table in lttng-types.c along with this enum */
70 enum lttng_string_encodings
{
71 lttng_encode_none
= 0,
72 lttng_encode_UTF8
= 1,
73 lttng_encode_ASCII
= 2,
77 struct lttng_enum_value
{
78 unsigned long long value
;
79 unsigned int signedness
:1;
82 enum lttng_enum_entry_options
{
83 LTTNG_ENUM_ENTRY_OPTION_IS_AUTO
= 1U << 0,
87 * Enumeration entry description
89 * IMPORTANT: this structure is part of the ABI between the probe and
90 * UST. Fields need to be only added at the end, never reordered, never
93 * The field @struct_size should be used to determine the size of the
94 * structure. It should be queried before using additional fields added
95 * at the end of the structure.
98 struct lttng_ust_enum_entry
{
101 struct lttng_enum_value start
, end
; /* start and end are inclusive */
103 unsigned int options
;
105 /* End of base ABI. Fields below should be used after checking struct_size. */
108 #define __type_integer(_type, _byte_order, _base, _encoding) \
110 .atype = atype_integer, \
115 .size = sizeof(_type) * CHAR_BIT, \
116 .alignment = lttng_alignof(_type) * CHAR_BIT, \
117 .signedness = lttng_is_signed_type(_type), \
118 .reverse_byte_order = _byte_order != BYTE_ORDER, \
120 .encoding = lttng_encode_##_encoding, \
125 #define LTTNG_UST_INTEGER_TYPE_PADDING 24
126 struct lttng_integer_type
{
127 unsigned int size
; /* in bits */
128 unsigned short alignment
; /* in bits */
129 unsigned int signedness
:1;
130 unsigned int reverse_byte_order
:1;
131 unsigned int base
; /* 2, 8, 10, 16, for pretty print */
132 enum lttng_string_encodings encoding
;
133 char padding
[LTTNG_UST_INTEGER_TYPE_PADDING
];
137 * Only float and double are supported. long double is not supported at
140 #define _float_mant_dig(_type) \
141 (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
142 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
145 #define __type_float(_type) \
147 .atype = atype_float, \
152 .exp_dig = sizeof(_type) * CHAR_BIT \
153 - _float_mant_dig(_type), \
154 .mant_dig = _float_mant_dig(_type), \
155 .alignment = lttng_alignof(_type) * CHAR_BIT, \
156 .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
161 #define LTTNG_UST_FLOAT_TYPE_PADDING 24
162 struct lttng_float_type
{
163 unsigned int exp_dig
; /* exponent digits, in bits */
164 unsigned int mant_dig
; /* mantissa digits, in bits */
165 unsigned short alignment
; /* in bits */
166 unsigned int reverse_byte_order
:1;
167 char padding
[LTTNG_UST_FLOAT_TYPE_PADDING
];
170 #define LTTNG_UST_TYPE_PADDING 128
172 enum lttng_abstract_types atype
;
174 /* provider ABI 2.0 */
175 struct lttng_integer_type integer
;
176 struct lttng_float_type _float
;
178 enum lttng_string_encodings encoding
;
181 const struct lttng_ust_enum_desc
*desc
; /* Enumeration mapping */
182 struct lttng_type
*container_type
;
185 const struct lttng_type
*elem_type
;
186 unsigned int length
; /* Num. elems. */
187 unsigned int alignment
;
190 const char *length_name
; /* Length field name. */
191 const struct lttng_type
*elem_type
;
192 unsigned int alignment
; /* Alignment before elements. */
195 unsigned int nr_fields
;
196 const struct lttng_ust_event_field
**fields
; /* Array of pointers to fields. */
197 unsigned int alignment
;
200 char padding
[LTTNG_UST_TYPE_PADDING
];
205 * Enumeration description
207 * IMPORTANT: this structure is part of the ABI between the probe and
208 * UST. Fields need to be only added at the end, never reordered, never
211 * The field @struct_size should be used to determine the size of the
212 * structure. It should be queried before using additional fields added
213 * at the end of the structure.
216 struct lttng_ust_enum_desc
{
217 uint32_t struct_size
;
220 const struct lttng_ust_enum_entry
**entries
;
221 unsigned int nr_entries
;
223 /* End of base ABI. Fields below should be used after checking struct_size. */
227 * Event field description
229 * IMPORTANT: this structure is part of the ABI between the probe and
230 * UST. Fields need to be only added at the end, never reordered, never
233 * The field @struct_size should be used to determine the size of the
234 * structure. It should be queried before using additional fields added
235 * at the end of the structure.
238 struct lttng_ust_event_field
{
239 uint32_t struct_size
;
242 struct lttng_type type
;
243 unsigned int nowrite
:1, /* do not write into trace */
244 nofilter
:1; /* do not consider for filter */
246 /* End of base ABI. Fields below should be used after checking struct_size. */
251 * IMPORTANT: this structure is part of the ABI between the probe and
252 * UST. Fields need to be only added at the end, never reordered, never
255 * The field @struct_size should be used to determine the size of the
256 * structure. It should be queried before using additional fields added
257 * at the end of the structure.
259 struct lttng_ust_event_desc
{
260 uint32_t struct_size
; /* Size of this structure. */
262 void (*probe_callback
)(void);
263 const struct lttng_event_ctx
*ctx
; /* context */
264 const struct lttng_ust_event_field
**fields
; /* event payload */
265 unsigned int nr_fields
;
266 const int **loglevel
;
267 const char *signature
; /* Argument types/names received */
268 const char **model_emf_uri
;
270 /* End of base ABI. Fields below should be used after checking struct_size. */
274 * IMPORTANT: this structure is part of the ABI between the probe and
275 * UST. Fields need to be only added at the end, never reordered, never
278 * The field @struct_size should be used to determine the size of the
279 * structure. It should be queried before using additional fields added
280 * at the end of the structure.
282 struct lttng_ust_probe_desc
{
283 uint32_t struct_size
; /* Size of this structure. */
285 const char *provider
;
286 const struct lttng_ust_event_desc
**event_desc
;
287 unsigned int nr_events
;
288 struct cds_list_head head
; /* chain registered probes */
289 struct cds_list_head lazy_init_head
;
290 int lazy
; /* lazy registration */
294 /* End of base ABI. Fields below should be used after checking struct_size. */
297 /* Data structures used by the tracer. */
300 * Bytecode interpreter return value masks.
302 enum lttng_bytecode_interpreter_ret
{
303 LTTNG_INTERPRETER_DISCARD
= 0,
304 LTTNG_INTERPRETER_RECORD_FLAG
= (1ULL << 0),
305 /* Other bits are kept for future use. */
308 struct lttng_interpreter_output
;
309 struct lttng_ust_bytecode_runtime_private
;
312 * IMPORTANT: this structure is part of the ABI between the probe and
313 * UST. Fields need to be only added at the end, never reordered, never
316 * The field @struct_size should be used to determine the size of the
317 * structure. It should be queried before using additional fields added
318 * at the end of the structure.
320 struct lttng_ust_bytecode_runtime
{
321 uint32_t struct_size
; /* Size of this structure. */
323 struct lttng_ust_bytecode_runtime_private
*priv
;
324 /* Associated bytecode */
326 uint64_t (*filter
)(void *interpreter_data
,
327 const char *interpreter_stack_data
);
328 uint64_t (*capture
)(void *interpreter_data
,
329 const char *interpreter_stack_data
,
330 struct lttng_interpreter_output
*interpreter_output
);
332 struct cds_list_head node
; /* list of bytecode runtime in event */
334 /* End of base ABI. Fields below should be used after checking struct_size. */
338 * lttng_event structure is referred to by the tracing fast path. It
339 * must be kept small.
341 * IMPORTANT: this structure is part of the ABI between the probe and
342 * UST. Fields need to be only added at the end, never reordered, never
347 struct lttng_ust_event_common_private
;
349 enum lttng_ust_event_type
{
350 LTTNG_UST_EVENT_TYPE_RECORDER
= 0,
351 LTTNG_UST_EVENT_TYPE_NOTIFIER
= 1,
355 * IMPORTANT: this structure is part of the ABI between the probe and
356 * UST. Fields need to be only added at the end, never reordered, never
359 * struct lttng_ust_event_common is the common ancestor of the various
360 * public event actions. Inheritance is done by composition: The parent
361 * has a pointer to its child, and the child has a pointer to its
362 * parent. Inheritance of those public structures is done by composition
363 * to ensure both parent and child structures can be extended.
365 * The field @struct_size should be used to determine the size of the
366 * structure. It should be queried before using additional fields added
367 * at the end of the structure.
369 struct lttng_ust_event_common
{
370 uint32_t struct_size
; /* Size of this structure. */
371 struct lttng_ust_event_common_private
*priv
; /* Private event interface */
373 enum lttng_ust_event_type type
;
374 void *child
; /* Pointer to child, for inheritance by aggregation. */
377 int has_enablers_without_bytecode
;
378 /* list of struct lttng_ust_bytecode_runtime, sorted by seqnum */
379 struct cds_list_head filter_bytecode_runtime_head
;
381 /* End of base ABI. Fields below should be used after checking struct_size. */
384 struct lttng_ust_event_recorder_private
;
387 * IMPORTANT: this structure is part of the ABI between the probe and
388 * UST. Fields need to be only added at the end, never reordered, never
391 * struct lttng_ust_event_recorder is the action for recording events
392 * into a ring buffer. It inherits from struct lttng_ust_event_common
393 * by composition to ensure both parent and child structure are
396 * The field @struct_size should be used to determine the size of the
397 * structure. It should be queried before using additional fields added
398 * at the end of the structure.
400 struct lttng_ust_event_recorder
{
401 uint32_t struct_size
; /* Size of this structure. */
402 struct lttng_ust_event_common
*parent
; /* Inheritance by aggregation. */
403 struct lttng_ust_event_recorder_private
*priv
; /* Private event record interface */
406 struct lttng_channel
*chan
;
407 struct lttng_ctx
*ctx
;
409 /* End of base ABI. Fields below should be used after checking struct_size. */
412 struct lttng_ust_event_notifier_private
;
415 * IMPORTANT: this structure is part of the ABI between the probe and
416 * UST. Fields need to be only added at the end, never reordered, never
419 * struct lttng_ust_event_notifier is the action for sending
420 * notifications. It inherits from struct lttng_ust_event_common
421 * by composition to ensure both parent and child structure are
424 * The field @struct_size should be used to determine the size of the
425 * structure. It should be queried before using additional fields added
426 * at the end of the structure.
428 struct lttng_ust_event_notifier
{
429 uint32_t struct_size
; /* Size of this structure. */
431 struct lttng_ust_event_common
*parent
; /* Inheritance by aggregation. */
432 struct lttng_ust_event_notifier_private
*priv
; /* Private event notifier interface */
434 void (*notification_send
)(struct lttng_ust_event_notifier
*event_notifier
,
435 const char *stack_data
);
436 struct cds_list_head capture_bytecode_runtime_head
;
438 /* End of base ABI. Fields below should be used after checking struct_size. */
442 struct lttng_ust_shm_handle
;
445 * IMPORTANT: this structure is part of the ABI between the probe and
446 * UST. Fields need to be only added at the end, never reordered, never
449 * The field @struct_size should be used to determine the size of the
450 * structure. It should be queried before using additional fields added
451 * at the end of the structure.
453 struct lttng_ust_channel_ops
{
454 uint32_t struct_size
;
456 struct lttng_channel
*(*channel_create
)(const char *name
,
458 size_t subbuf_size
, size_t num_subbuf
,
459 unsigned int switch_timer_interval
,
460 unsigned int read_timer_interval
,
463 const int *stream_fds
, int nr_stream_fds
,
464 int64_t blocking_timeout
);
465 void (*channel_destroy
)(struct lttng_channel
*chan
);
466 int (*event_reserve
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
468 void (*event_commit
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
);
469 void (*event_write
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
470 const void *src
, size_t len
);
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.
476 size_t (*packet_avail_size
)(struct channel
*chan
,
477 struct lttng_ust_shm_handle
*handle
);
478 int (*is_finalized
)(struct channel
*chan
);
479 int (*is_disabled
)(struct channel
*chan
);
480 int (*flush_buffer
)(struct channel
*chan
, struct lttng_ust_shm_handle
*handle
);
481 void (*event_strcpy
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
482 const char *src
, size_t len
);
484 /* End of base ABI. Fields below should be used after checking struct_size. */
488 * IMPORTANT: this structure is part of the ABI between the probe and
489 * UST. Fields need to be only added at the end, never reordered, never
492 struct lttng_channel
{
494 * The pointers located in this private data are NOT safe to be
495 * dereferenced by the consumer. The only operations the
496 * consumer process is designed to be allowed to do is to read
497 * and perform subbuffer flush.
499 struct channel
*chan
; /* Channel buffers */
501 struct lttng_ctx
*ctx
;
502 /* Event ID management */
503 struct lttng_session
*session
;
504 int objd
; /* Object associated to channel */
505 struct cds_list_head node
; /* Channel list in session */
506 const struct lttng_ust_channel_ops
*ops
;
507 int header_type
; /* 0: unset, 1: compact, 2: large */
508 struct lttng_ust_shm_handle
*handle
; /* shared-memory handle */
512 enum lttng_ust_abi_chan_type type
;
513 unsigned char uuid
[LTTNG_UST_UUID_LEN
]; /* Trace session unique ID */
514 int tstate
:1; /* Transient enable state */
518 * IMPORTANT: this structure is part of the ABI between the probe and
519 * UST. Fields need to be only added at the end, never reordered, never
522 * The field @struct_size should be used to determine the size of the
523 * structure. It should be queried before using additional fields added
524 * at the end of the structure.
526 struct lttng_ust_stack_ctx
{
527 uint32_t struct_size
; /* Size of this structure */
529 struct lttng_ust_event_recorder
*event_recorder
;
530 struct lttng_ctx
*chan_ctx
; /* RCU dereferenced. */
531 struct lttng_ctx
*event_ctx
; /* RCU dereferenced. */
533 /* End of base ABI. Fields below should be used after checking struct_size. */
536 struct lttng_ust_session_private
;
539 * IMPORTANT: this structure is part of the ABI between the probe and
540 * UST. Fields need to be only added at the end, never reordered, never
543 * The field @struct_size should be used to determine the size of the
544 * structure. It should be queried before using additional fields added
545 * at the end of the structure.
547 struct lttng_session
{
548 uint32_t struct_size
; /* Size of this structure */
549 struct lttng_ust_session_private
*priv
; /* Private session interface */
551 int active
; /* Is trace session active ? */
553 /* End of base ABI. Fields below should be used after checking struct_size. */
556 int lttng_ust_probe_register(struct lttng_ust_probe_desc
*desc
);
557 void lttng_ust_probe_unregister(struct lttng_ust_probe_desc
*desc
);
560 * Applications that change their procname and need the new value to be
561 * reflected in the procname event context have to call this function to clear
562 * the internally cached value. This should not be called from a signal
565 void lttng_ust_context_procname_reset(void);
571 #endif /* _LTTNG_UST_EVENTS_H */