1 #ifndef _LTTNG_UST_EVENTS_H
2 #define _LTTNG_UST_EVENTS_H
7 * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Holds LTTng per-session event registry.
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
22 #include <urcu/list.h>
23 #include <urcu/hlist.h>
25 #include <lttng/ust-abi.h>
26 #include <lttng/ust-tracer.h>
27 #include <lttng/ust-endian.h>
30 #define LTTNG_UST_UUID_LEN 16
34 struct lttng_ust_lib_ring_buffer_ctx
;
37 * Data structures used by tracepoint event declarations, and by the
38 * tracer. Those structures have padding for future extension.
42 * LTTng client type enumeration. Used by the consumer to map the
43 * callbacks from its own address space.
45 enum lttng_client_types
{
46 LTTNG_CLIENT_METADATA
= 0,
47 LTTNG_CLIENT_DISCARD
= 1,
48 LTTNG_CLIENT_OVERWRITE
= 2,
49 LTTNG_NR_CLIENT_TYPES
,
52 /* Type description */
54 /* Update the astract_types name table in lttng-types.c along with this enum */
65 /* Update the string_encodings name table in lttng-types.c along with this enum */
66 enum lttng_string_encodings
{
67 lttng_encode_none
= 0,
68 lttng_encode_UTF8
= 1,
69 lttng_encode_ASCII
= 2,
73 #define LTTNG_UST_ENUM_ENTRY_PADDING 16
74 struct lttng_enum_entry
{
75 unsigned long long start
, end
; /* start and end are inclusive */
77 char padding
[LTTNG_UST_ENUM_ENTRY_PADDING
];
80 #define __type_integer(_type, _byte_order, _base, _encoding) \
82 .atype = atype_integer, \
85 .size = sizeof(_type) * CHAR_BIT, \
86 .alignment = lttng_alignof(_type) * CHAR_BIT, \
87 .signedness = lttng_is_signed_type(_type), \
88 .reverse_byte_order = _byte_order != BYTE_ORDER, \
90 .encoding = lttng_encode_##_encoding, \
94 #define LTTNG_UST_INTEGER_TYPE_PADDING 24
95 struct lttng_integer_type
{
96 unsigned int size
; /* in bits */
97 unsigned short alignment
; /* in bits */
98 unsigned int signedness
:1;
99 unsigned int reverse_byte_order
:1;
100 unsigned int base
; /* 2, 8, 10, 16, for pretty print */
101 enum lttng_string_encodings encoding
;
102 char padding
[LTTNG_UST_INTEGER_TYPE_PADDING
];
106 * Only float and double are supported. long double is not supported at
109 #define _float_mant_dig(_type) \
110 (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
111 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
114 #define __type_float(_type) \
116 .atype = atype_float, \
119 .exp_dig = sizeof(_type) * CHAR_BIT \
120 - _float_mant_dig(_type), \
121 .mant_dig = _float_mant_dig(_type), \
122 .alignment = lttng_alignof(_type) * CHAR_BIT, \
123 .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
127 #define LTTNG_UST_FLOAT_TYPE_PADDING 24
128 struct lttng_float_type
{
129 unsigned int exp_dig
; /* exponent digits, in bits */
130 unsigned int mant_dig
; /* mantissa digits, in bits */
131 unsigned short alignment
; /* in bits */
132 unsigned int reverse_byte_order
:1;
133 char padding
[LTTNG_UST_FLOAT_TYPE_PADDING
];
136 #define LTTNG_UST_BASIC_TYPE_PADDING 128
137 union _lttng_basic_type
{
138 struct lttng_integer_type integer
;
143 enum lttng_string_encodings encoding
;
145 struct lttng_float_type _float
;
146 char padding
[LTTNG_UST_BASIC_TYPE_PADDING
];
149 struct lttng_basic_type
{
150 enum abstract_types atype
;
152 union _lttng_basic_type basic
;
156 #define LTTNG_UST_TYPE_PADDING 128
158 enum abstract_types atype
;
160 union _lttng_basic_type basic
;
162 struct lttng_basic_type elem_type
;
163 unsigned int length
; /* num. elems. */
166 struct lttng_basic_type length_type
;
167 struct lttng_basic_type elem_type
;
169 char padding
[LTTNG_UST_TYPE_PADDING
];
173 #define LTTNG_UST_ENUM_TYPE_PADDING 24
176 struct lttng_type container_type
;
177 const struct lttng_enum_entry
*entries
;
179 char padding
[LTTNG_UST_ENUM_TYPE_PADDING
];
182 /* Event field description */
184 #define LTTNG_UST_EVENT_FIELD_PADDING 32
185 struct lttng_event_field
{
187 struct lttng_type type
;
188 char padding
[LTTNG_UST_EVENT_FIELD_PADDING
];
191 #define LTTNG_UST_CTX_FIELD_PADDING 40
192 struct lttng_ctx_field
{
193 struct lttng_event_field event_field
;
194 size_t (*get_size
)(size_t offset
);
195 void (*record
)(struct lttng_ctx_field
*field
,
196 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
197 struct ltt_channel
*chan
);
199 char padding
[LTTNG_UST_CTX_FIELD_PADDING
];
201 void (*destroy
)(struct lttng_ctx_field
*field
);
204 #define LTTNG_UST_CTX_PADDING 24
206 struct lttng_ctx_field
*fields
;
207 unsigned int nr_fields
;
208 unsigned int allocated_fields
;
209 char padding
[LTTNG_UST_CTX_PADDING
];
212 #define LTTNG_UST_EVENT_DESC_PADDING 40
213 struct lttng_event_desc
{
215 void *probe_callback
;
216 const struct lttng_event_ctx
*ctx
; /* context */
217 const struct lttng_event_field
*fields
; /* event payload */
218 unsigned int nr_fields
;
219 const int **loglevel
;
220 const char *signature
; /* Argument types/names received */
221 char padding
[LTTNG_UST_EVENT_DESC_PADDING
];
224 #define LTTNG_UST_PROBE_DESC_PADDING 40
225 struct lttng_probe_desc
{
226 const char *provider
;
227 const struct lttng_event_desc
**event_desc
;
228 unsigned int nr_events
;
229 struct cds_list_head head
; /* chain registered probes */
230 char padding
[LTTNG_UST_PROBE_DESC_PADDING
];
233 /* Data structures used by the tracer. */
236 * Entry describing a per-session active wildcard, along with the event
237 * attribute and channel information configuring the events that need to
240 struct session_wildcard
{
241 struct ltt_channel
*chan
;
242 struct lttng_ctx
*ctx
; /* TODO */
243 struct lttng_ust_event event_param
;
244 struct cds_list_head events
; /* list of events enabled */
245 struct cds_list_head list
; /* per-session list of wildcards */
246 struct cds_list_head session_list
; /* node of session wildcard list */
247 struct wildcard_entry
*entry
;
248 unsigned int enabled
:1;
252 * Entry describing an active wildcard (per name) for all sessions.
254 struct wildcard_entry
{
255 /* node of global wildcards list */
256 struct cds_list_head list
;
257 /* head of session list to which this wildcard apply */
258 struct cds_list_head session_list
;
259 enum lttng_ust_loglevel_type loglevel_type
;
264 struct tp_list_entry
{
265 struct lttng_ust_tracepoint_iter tp
;
266 struct cds_list_head head
;
269 struct lttng_ust_tracepoint_list
{
270 struct tp_list_entry
*iter
;
271 struct cds_list_head head
;
274 struct ust_pending_probe
;
277 * ltt_event structure is referred to by the tracing fast path. It must be
282 struct ltt_channel
*chan
;
284 const struct lttng_event_desc
*desc
;
286 struct lttng_ctx
*ctx
;
287 enum lttng_ust_instrumentation instrumentation
;
290 struct cds_list_head list
; /* Event list */
291 struct cds_list_head wildcard_list
; /* Event list for wildcard */
292 struct ust_pending_probe
*pending_probe
;
293 unsigned int metadata_dumped
:1;
297 struct lttng_ust_shm_handle
;
299 struct ltt_channel_ops
{
300 struct ltt_channel
*(*channel_create
)(const char *name
,
302 size_t subbuf_size
, size_t num_subbuf
,
303 unsigned int switch_timer_interval
,
304 unsigned int read_timer_interval
,
305 int **shm_fd
, int **wait_fd
,
306 uint64_t **memory_map_size
,
307 struct ltt_channel
*chan_priv_init
);
308 void (*channel_destroy
)(struct ltt_channel
*ltt_chan
);
309 struct lttng_ust_lib_ring_buffer
*(*buffer_read_open
)(struct channel
*chan
,
310 struct lttng_ust_shm_handle
*handle
,
311 int **shm_fd
, int **wait_fd
,
312 uint64_t **memory_map_size
);
313 void (*buffer_read_close
)(struct lttng_ust_lib_ring_buffer
*buf
,
314 struct lttng_ust_shm_handle
*handle
);
315 int (*event_reserve
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
317 void (*event_commit
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
);
318 void (*event_write
)(struct lttng_ust_lib_ring_buffer_ctx
*ctx
, const void *src
,
321 * packet_avail_size returns the available size in the current
322 * packet. Note that the size returned is only a hint, since it
323 * may change due to concurrent writes.
325 size_t (*packet_avail_size
)(struct channel
*chan
,
326 struct lttng_ust_shm_handle
*handle
);
327 //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
328 //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
329 int (*is_finalized
)(struct channel
*chan
);
330 int (*is_disabled
)(struct channel
*chan
);
331 int (*flush_buffer
)(struct channel
*chan
, struct lttng_ust_shm_handle
*handle
);
336 * The pointers located in this private data are NOT safe to be
337 * dereferenced by the consumer. The only operations the
338 * consumer process is designed to be allowed to do is to read
339 * and perform subbuffer flush.
341 struct channel
*chan
; /* Channel buffers */
343 struct lttng_ctx
*ctx
;
344 /* Event ID management */
345 struct ltt_session
*session
;
346 int objd
; /* Object associated to channel */
347 unsigned int free_event_id
; /* Next event ID to allocate */
348 unsigned int used_event_id
; /* Max allocated event IDs */
349 struct cds_list_head list
; /* Channel list */
350 struct ltt_channel_ops
*ops
;
351 int header_type
; /* 0: unset, 1: compact, 2: large */
352 struct lttng_ust_shm_handle
*handle
; /* shared-memory handle */
353 unsigned int metadata_dumped
:1;
355 /* Channel ID, available for consumer too */
357 /* Copy of session UUID for consumer (availability through shm) */
358 unsigned char uuid
[LTTNG_UST_UUID_LEN
]; /* Trace session unique ID */
362 int active
; /* Is trace session active ? */
363 int been_active
; /* Has trace session been active ? */
364 int objd
; /* Object associated to session */
365 struct ltt_channel
*metadata
; /* Metadata channel */
366 struct cds_list_head chan
; /* Channel list head */
367 struct cds_list_head events
; /* Event list head */
368 struct cds_list_head wildcards
; /* Wildcard list head */
369 struct cds_list_head list
; /* Session list */
370 unsigned int free_chan_id
; /* Next chan ID to allocate */
371 unsigned char uuid
[LTTNG_UST_UUID_LEN
]; /* Trace session unique ID */
372 unsigned int metadata_dumped
:1;
375 struct ltt_transport
{
377 struct cds_list_head node
;
378 struct ltt_channel_ops ops
;
381 struct ltt_session
*ltt_session_create(void);
382 int ltt_session_enable(struct ltt_session
*session
);
383 int ltt_session_disable(struct ltt_session
*session
);
384 void ltt_session_destroy(struct ltt_session
*session
);
386 struct ltt_channel
*ltt_channel_create(struct ltt_session
*session
,
387 const char *transport_name
,
389 size_t subbuf_size
, size_t num_subbuf
,
390 unsigned int switch_timer_interval
,
391 unsigned int read_timer_interval
,
392 int **shm_fd
, int **wait_fd
,
393 uint64_t **memory_map_size
,
394 struct ltt_channel
*chan_priv_init
);
395 struct ltt_channel
*ltt_global_channel_create(struct ltt_session
*session
,
396 int overwrite
, void *buf_addr
,
397 size_t subbuf_size
, size_t num_subbuf
,
398 unsigned int switch_timer_interval
,
399 unsigned int read_timer_interval
,
400 int **shm_fd
, int **wait_fd
,
401 uint64_t **memory_map_size
);
403 int ltt_event_create(struct ltt_channel
*chan
,
404 struct lttng_ust_event
*event_param
,
406 struct ltt_event
**event
);
408 int ltt_channel_enable(struct ltt_channel
*channel
);
409 int ltt_channel_disable(struct ltt_channel
*channel
);
410 int ltt_event_enable(struct ltt_event
*event
);
411 int ltt_event_disable(struct ltt_event
*event
);
413 void ltt_transport_register(struct ltt_transport
*transport
);
414 void ltt_transport_unregister(struct ltt_transport
*transport
);
416 void synchronize_trace(void);
418 int ltt_probe_register(struct lttng_probe_desc
*desc
);
419 void ltt_probe_unregister(struct lttng_probe_desc
*desc
);
420 int pending_probe_fix_events(const struct lttng_event_desc
*desc
);
421 const struct lttng_event_desc
*ltt_event_get(const char *name
);
422 void ltt_event_put(const struct lttng_event_desc
*desc
);
423 int ltt_probes_init(void);
424 void ltt_probes_exit(void);
425 int lttng_find_context(struct lttng_ctx
*ctx
, const char *name
);
426 struct lttng_ctx_field
*lttng_append_context(struct lttng_ctx
**ctx_p
);
427 void lttng_remove_context_field(struct lttng_ctx
**ctx_p
,
428 struct lttng_ctx_field
*field
);
429 void lttng_destroy_context(struct lttng_ctx
*ctx
);
430 int lttng_add_vtid_to_ctx(struct lttng_ctx
**ctx
);
431 int lttng_add_vpid_to_ctx(struct lttng_ctx
**ctx
);
432 int lttng_add_pthread_id_to_ctx(struct lttng_ctx
**ctx
);
433 int lttng_add_procname_to_ctx(struct lttng_ctx
**ctx
);
434 void lttng_context_vtid_reset(void);
435 void lttng_context_vpid_reset(void);
437 const struct lttng_ust_lib_ring_buffer_client_cb
*lttng_client_callbacks_metadata
;
438 const struct lttng_ust_lib_ring_buffer_client_cb
*lttng_client_callbacks_discard
;
439 const struct lttng_ust_lib_ring_buffer_client_cb
*lttng_client_callbacks_overwrite
;
441 struct ltt_transport
*ltt_transport_find(const char *name
);
443 int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list
*list
);
444 void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list
*list
);
445 struct lttng_ust_tracepoint_iter
*
446 lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list
*list
);
448 int ltt_wildcard_enable(struct session_wildcard
*wildcard
);
449 int ltt_wildcard_disable(struct session_wildcard
*wildcard
);
450 int ltt_wildcard_create(struct ltt_channel
*chan
,
451 struct lttng_ust_event
*event_param
,
452 struct session_wildcard
**sl
);
453 int ltt_loglevel_match(const struct lttng_event_desc
*desc
,
454 enum lttng_ust_loglevel_type req_type
,
456 void ltt_probes_create_wildcard_events(struct wildcard_entry
*entry
,
457 struct session_wildcard
*wildcard
);
459 #endif /* _LTTNG_UST_EVENTS_H */