1 #ifndef _UST_LTTNG_EVENTS_H
2 #define _UST_LTTNG_EVENTS_H
7 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Holds LTTng per-session event registry.
11 * Dual LGPL v2.1/GPL v2 license.
14 #include <urcu/list.h>
15 #include <uuid/uuid.h>
17 #include <ust/lttng-ust-abi.h>
22 #define is_signed_type(type) (((type)(-1)) < 0)
26 struct lib_ring_buffer_ctx
;
28 /* Type description */
30 /* Update the astract_types name table in lttng-types.c along with this enum */
41 /* Update the string_encodings name table in lttng-types.c along with this enum */
42 enum lttng_string_encodings
{
43 lttng_encode_none
= 0,
44 lttng_encode_UTF8
= 1,
45 lttng_encode_ASCII
= 2,
49 struct lttng_enum_entry
{
50 unsigned long long start
, end
; /* start and end are inclusive */
54 #define __type_integer(_type, _byte_order, _base, _encoding) \
56 .atype = atype_integer, \
59 .size = sizeof(_type) * CHAR_BIT, \
60 .alignment = ltt_alignof(_type) * CHAR_BIT, \
61 .signedness = is_signed_type(_type), \
62 .reverse_byte_order = _byte_order != __BYTE_ORDER, \
64 .encoding = lttng_encode_##_encoding, \
68 struct lttng_integer_type {
69 unsigned int size
; /* in bits */
70 unsigned short alignment
; /* in bits */
71 unsigned int signedness
:1;
72 unsigned int reverse_byte_order
:1;
73 unsigned int base
; /* 2, 8, 10, 16, for pretty print */
74 enum lttng_string_encodings encoding
;
77 #define _float_mant_dig(_type) \
78 (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
79 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
80 : (sizeof(_type) == sizeof(long double) ? LDBL_MANT_DIG \
83 #define __type_float(_type) \
85 .atype = atype_float, \
88 .exp_dig = sizeof(_type) * CHAR_BIT \
89 - _float_mant_dig(_type), \
90 .mant_dig = _float_mant_dig(_type), \
91 .alignment = ltt_alignof(_type) * CHAR_BIT, \
92 .signedness = is_signed_type(_type), \
93 .reverse_byte_order = __BYTE_ORDER != __FLOAT_WORD_ORDER, \
97 struct lttng_float_type {
98 unsigned int exp_dig
; /* exponent digits, in bits */
99 unsigned int mant_dig
; /* mantissa digits, in bits */
100 unsigned short alignment
; /* in bits */
101 unsigned int reverse_byte_order
:1;
104 union _lttng_basic_type
{
105 struct lttng_integer_type integer
;
110 enum lttng_string_encodings encoding
;
112 struct lttng_float_type _float
;
115 struct lttng_basic_type
{
116 enum abstract_types atype
;
118 union _lttng_basic_type basic
;
123 enum abstract_types atype
;
125 union _lttng_basic_type basic
;
127 struct lttng_basic_type elem_type
;
128 unsigned int length
; /* num. elems. */
131 struct lttng_basic_type length_type
;
132 struct lttng_basic_type elem_type
;
139 struct lttng_type container_type
;
140 const struct lttng_enum_entry
*entries
;
144 /* Event field description */
146 struct lttng_event_field
{
148 struct lttng_type type
;
151 struct lttng_ctx_field
{
152 struct lttng_event_field event_field
;
153 size_t (*get_size
)(size_t offset
);
154 void (*record
)(struct lttng_ctx_field
*field
,
155 struct lib_ring_buffer_ctx
*ctx
,
156 struct ltt_channel
*chan
);
159 void (*destroy
)(struct lttng_ctx_field
*field
);
163 struct lttng_ctx_field
*fields
;
164 unsigned int nr_fields
;
165 unsigned int allocated_fields
;
168 struct lttng_event_desc
{
170 void *probe_callback
;
171 const struct lttng_event_ctx
*ctx
; /* context */
172 const struct lttng_event_field
*fields
; /* event payload */
173 unsigned int nr_fields
;
176 struct lttng_probe_desc
{
177 const struct lttng_event_desc
*event_desc
;
178 unsigned int nr_events
;
179 struct cds_list_head head
; /* chain registered probes */
183 * ltt_event structure is referred to by the tracing fast path. It must be
188 struct ltt_channel
*chan
;
190 const struct lttng_event_desc
*desc
;
192 struct lttng_ctx
*ctx
;
193 enum lttng_ust_instrumentation instrumentation
;
196 struct cds_list_head list
; /* Event list */
197 int metadata_dumped
:1;
202 struct ltt_channel_ops
{
203 struct shm_handle
*(*channel_create
)(const char *name
,
204 struct ltt_channel
*ltt_chan
,
206 size_t subbuf_size
, size_t num_subbuf
,
207 unsigned int switch_timer_interval
,
208 unsigned int read_timer_interval
);
209 void (*channel_destroy
)(struct shm_handle
*handle
);
210 struct lib_ring_buffer
*(*buffer_read_open
)(struct channel
*chan
);
211 void (*buffer_read_close
)(struct lib_ring_buffer
*buf
);
212 int (*event_reserve
)(struct lib_ring_buffer_ctx
*ctx
,
214 void (*event_commit
)(struct lib_ring_buffer_ctx
*ctx
);
215 void (*event_write
)(struct lib_ring_buffer_ctx
*ctx
, const void *src
,
218 * packet_avail_size returns the available size in the current
219 * packet. Note that the size returned is only a hint, since it
220 * may change due to concurrent writes.
222 size_t (*packet_avail_size
)(struct channel
*chan
);
223 //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
224 //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
225 int (*is_finalized
)(struct channel
*chan
);
226 int (*is_disabled
)(struct channel
*chan
);
231 struct channel
*chan
; /* Channel buffers */
233 struct lttng_ctx
*ctx
;
234 /* Event ID management */
235 struct ltt_session
*session
;
236 int objd
; /* Object associated to channel */
237 unsigned int free_event_id
; /* Next event ID to allocate */
238 struct cds_list_head list
; /* Channel list */
239 struct ltt_channel_ops
*ops
;
240 int header_type
; /* 0: unset, 1: compact, 2: large */
241 struct shm_handle
*handle
; /* shared-memory handle */
242 int metadata_dumped
:1;
246 int active
; /* Is trace session active ? */
247 int been_active
; /* Has trace session been active ? */
248 int objd
; /* Object associated to session */
249 struct ltt_channel
*metadata
; /* Metadata channel */
250 struct cds_list_head chan
; /* Channel list head */
251 struct cds_list_head events
; /* Event list head */
252 struct cds_list_head list
; /* Session list */
253 unsigned int free_chan_id
; /* Next chan ID to allocate */
254 uuid_t uuid
; /* Trace session unique ID */
255 int metadata_dumped
:1;
258 struct ltt_transport
{
260 struct cds_list_head node
;
261 struct ltt_channel_ops ops
;
264 struct ltt_session
*ltt_session_create(void);
265 int ltt_session_enable(struct ltt_session
*session
);
266 int ltt_session_disable(struct ltt_session
*session
);
267 void ltt_session_destroy(struct ltt_session
*session
);
269 struct ltt_channel
*ltt_channel_create(struct ltt_session
*session
,
270 const char *transport_name
,
272 size_t subbuf_size
, size_t num_subbuf
,
273 unsigned int switch_timer_interval
,
274 unsigned int read_timer_interval
);
275 struct ltt_channel
*ltt_global_channel_create(struct ltt_session
*session
,
276 int overwrite
, void *buf_addr
,
277 size_t subbuf_size
, size_t num_subbuf
,
278 unsigned int switch_timer_interval
,
279 unsigned int read_timer_interval
);
281 struct ltt_event
*ltt_event_create(struct ltt_channel
*chan
,
282 struct lttng_ust_event
*event_param
,
285 int ltt_channel_enable(struct ltt_channel
*channel
);
286 int ltt_channel_disable(struct ltt_channel
*channel
);
287 int ltt_event_enable(struct ltt_event
*event
);
288 int ltt_event_disable(struct ltt_event
*event
);
290 void ltt_transport_register(struct ltt_transport
*transport
);
291 void ltt_transport_unregister(struct ltt_transport
*transport
);
293 void synchronize_trace(void);
294 //int ltt_debugfs_abi_init(void);
295 //void ltt_debugfs_abi_exit(void);
297 int ltt_probe_register(struct lttng_probe_desc
*desc
);
298 void ltt_probe_unregister(struct lttng_probe_desc
*desc
);
299 const struct lttng_event_desc
*ltt_event_get(const char *name
);
300 void ltt_event_put(const struct lttng_event_desc
*desc
);
301 int ltt_probes_init(void);
302 void ltt_probes_exit(void);
303 struct lttng_ctx_field
*lttng_append_context(struct lttng_ctx
**ctx
);
304 void lttng_remove_context_field(struct lttng_ctx
**ctx
,
305 struct lttng_ctx_field
*field
);
306 void lttng_destroy_context(struct lttng_ctx
*ctx
);
307 int lttng_add_vtid_to_ctx(struct lttng_ctx
**ctx
);
309 //extern const struct file_operations lttng_tracepoint_list_fops;
311 #endif /* _UST_LTTNG_EVENTS_H */