Fix: add provider ABI compatibility check
[lttng-ust.git] / include / lttng / ust-events.h
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1#ifndef _LTTNG_UST_EVENTS_H
2#define _LTTNG_UST_EVENTS_H
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3
4/*
51489cad 5 * lttng/ust-events.h
8020ceb5 6 *
e92f3e28 7 * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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8 *
9 * Holds LTTng per-session event registry.
10 *
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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:
a60d70e6 17 *
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18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * SOFTWARE.
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28 */
29
9f3fdbc6 30#include <urcu/list.h>
1f18504e 31#include <urcu/hlist.h>
9f3fdbc6 32#include <stdint.h>
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33#include <lttng/ust-abi.h>
34#include <lttng/ust-tracer.h>
2ae57758 35#include <lttng/ust-endian.h>
20f1eee7 36#include <float.h>
8020ceb5 37
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38#define LTTNG_UST_UUID_LEN 16
39
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40/*
41 * Tracepoint provider version. Compatibility based on the major number.
42 * Older tracepoint providers can always register to newer lttng-ust
43 * library, but the opposite is rejected: a newer tracepoint provider is
44 * rejected by an older lttng-ust library.
45 */
46#define LTTNG_UST_PROVIDER_MAJOR 1
47#define LTTNG_UST_PROVIDER_MINOR 0
48
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49struct lttng_channel;
50struct lttng_session;
4cfec15c 51struct lttng_ust_lib_ring_buffer_ctx;
8020ceb5 52
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53/*
54 * Data structures used by tracepoint event declarations, and by the
55 * tracer. Those structures have padding for future extension.
56 */
57
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58/*
59 * LTTng client type enumeration. Used by the consumer to map the
60 * callbacks from its own address space.
61 */
62enum lttng_client_types {
63 LTTNG_CLIENT_METADATA = 0,
64 LTTNG_CLIENT_DISCARD = 1,
65 LTTNG_CLIENT_OVERWRITE = 2,
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66 LTTNG_CLIENT_DISCARD_RT = 3,
67 LTTNG_CLIENT_OVERWRITE_RT = 4,
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68 LTTNG_NR_CLIENT_TYPES,
69};
70
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71/* Type description */
72
73/* Update the astract_types name table in lttng-types.c along with this enum */
7dd08bec 74enum lttng_abstract_types {
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75 atype_integer,
76 atype_enum,
77 atype_array,
78 atype_sequence,
79 atype_string,
20f1eee7 80 atype_float,
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81 NR_ABSTRACT_TYPES,
82};
83
84/* Update the string_encodings name table in lttng-types.c along with this enum */
85enum lttng_string_encodings {
86 lttng_encode_none = 0,
87 lttng_encode_UTF8 = 1,
88 lttng_encode_ASCII = 2,
89 NR_STRING_ENCODINGS,
90};
91
37d5e202 92#define LTTNG_UST_ENUM_ENTRY_PADDING 16
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93struct lttng_enum_entry {
94 unsigned long long start, end; /* start and end are inclusive */
95 const char *string;
37d5e202 96 char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
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97};
98
99#define __type_integer(_type, _byte_order, _base, _encoding) \
100 { \
101 .atype = atype_integer, \
102 .u.basic.integer = \
103 { \
104 .size = sizeof(_type) * CHAR_BIT, \
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105 .alignment = lttng_alignof(_type) * CHAR_BIT, \
106 .signedness = lttng_is_signed_type(_type), \
8d1d746f 107 .reverse_byte_order = _byte_order != BYTE_ORDER, \
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108 .base = _base, \
109 .encoding = lttng_encode_##_encoding, \
110 }, \
111 } \
112
37d5e202 113#define LTTNG_UST_INTEGER_TYPE_PADDING 24
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114struct lttng_integer_type {
115 unsigned int size; /* in bits */
116 unsigned short alignment; /* in bits */
117 unsigned int signedness:1;
118 unsigned int reverse_byte_order:1;
119 unsigned int base; /* 2, 8, 10, 16, for pretty print */
120 enum lttng_string_encodings encoding;
37d5e202 121 char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
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122};
123
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124/*
125 * Only float and double are supported. long double is not supported at
126 * the moment.
127 */
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128#define _float_mant_dig(_type) \
129 (sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
130 : (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
d3ed854b 131 : 0))
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132
133#define __type_float(_type) \
134 { \
135 .atype = atype_float, \
136 .u.basic._float = \
137 { \
138 .exp_dig = sizeof(_type) * CHAR_BIT \
139 - _float_mant_dig(_type), \
140 .mant_dig = _float_mant_dig(_type), \
1dbfff0c 141 .alignment = lttng_alignof(_type) * CHAR_BIT, \
ad496c21 142 .reverse_byte_order = BYTE_ORDER != FLOAT_WORD_ORDER, \
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143 }, \
144 } \
145
37d5e202 146#define LTTNG_UST_FLOAT_TYPE_PADDING 24
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147struct lttng_float_type {
148 unsigned int exp_dig; /* exponent digits, in bits */
149 unsigned int mant_dig; /* mantissa digits, in bits */
150 unsigned short alignment; /* in bits */
151 unsigned int reverse_byte_order:1;
37d5e202 152 char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
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153};
154
37d5e202 155#define LTTNG_UST_BASIC_TYPE_PADDING 128
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156union _lttng_basic_type {
157 struct lttng_integer_type integer;
158 struct {
159 const char *name;
160 } enumeration;
161 struct {
162 enum lttng_string_encodings encoding;
163 } string;
20f1eee7 164 struct lttng_float_type _float;
37d5e202 165 char padding[LTTNG_UST_BASIC_TYPE_PADDING];
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166};
167
168struct lttng_basic_type {
7dd08bec 169 enum lttng_abstract_types atype;
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170 union {
171 union _lttng_basic_type basic;
172 } u;
173};
174
37d5e202 175#define LTTNG_UST_TYPE_PADDING 128
8020ceb5 176struct lttng_type {
7dd08bec 177 enum lttng_abstract_types atype;
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178 union {
179 union _lttng_basic_type basic;
180 struct {
181 struct lttng_basic_type elem_type;
182 unsigned int length; /* num. elems. */
183 } array;
184 struct {
185 struct lttng_basic_type length_type;
186 struct lttng_basic_type elem_type;
187 } sequence;
37d5e202 188 char padding[LTTNG_UST_TYPE_PADDING];
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189 } u;
190};
191
37d5e202 192#define LTTNG_UST_ENUM_TYPE_PADDING 24
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193struct lttng_enum {
194 const char *name;
195 struct lttng_type container_type;
196 const struct lttng_enum_entry *entries;
23c8854a 197 unsigned int len;
37d5e202 198 char padding[LTTNG_UST_ENUM_TYPE_PADDING];
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199};
200
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201/*
202 * Event field description
203 *
204 * IMPORTANT: this structure is part of the ABI between the probe and
205 * UST. Fields need to be only added at the end, never reordered, never
206 * removed.
207 */
8020ceb5 208
4774c8f3 209#define LTTNG_UST_EVENT_FIELD_PADDING 28
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210struct lttng_event_field {
211 const char *name;
212 struct lttng_type type;
180901e6 213 unsigned int nowrite; /* do not write into trace */
37d5e202 214 char padding[LTTNG_UST_EVENT_FIELD_PADDING];
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215};
216
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217union lttng_ctx_value {
218 int64_t s64;
219 const char *str;
220 double d;
221};
222
37d5e202 223#define LTTNG_UST_CTX_FIELD_PADDING 40
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224struct lttng_ctx_field {
225 struct lttng_event_field event_field;
226 size_t (*get_size)(size_t offset);
227 void (*record)(struct lttng_ctx_field *field,
4cfec15c 228 struct lttng_ust_lib_ring_buffer_ctx *ctx,
7dd08bec 229 struct lttng_channel *chan);
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230 void (*get_value)(struct lttng_ctx_field *field,
231 union lttng_ctx_value *value);
8020ceb5 232 union {
37d5e202 233 char padding[LTTNG_UST_CTX_FIELD_PADDING];
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234 } u;
235 void (*destroy)(struct lttng_ctx_field *field);
236};
237
37d5e202 238#define LTTNG_UST_CTX_PADDING 24
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239struct lttng_ctx {
240 struct lttng_ctx_field *fields;
241 unsigned int nr_fields;
242 unsigned int allocated_fields;
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243 char padding[LTTNG_UST_CTX_PADDING];
244};
245
246#define LTTNG_UST_EVENT_DESC_PADDING 40
247struct lttng_event_desc {
248 const char *name;
fbdeb5ec 249 void (*probe_callback)(void);
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250 const struct lttng_event_ctx *ctx; /* context */
251 const struct lttng_event_field *fields; /* event payload */
252 unsigned int nr_fields;
253 const int **loglevel;
68755429 254 const char *signature; /* Argument types/names received */
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255 union {
256 struct {
257 const char **model_emf_uri;
258 } ext;
259 char padding[LTTNG_UST_EVENT_DESC_PADDING];
260 } u;
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261};
262
71d31690 263#define LTTNG_UST_PROBE_DESC_PADDING 12
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264struct lttng_probe_desc {
265 const char *provider;
266 const struct lttng_event_desc **event_desc;
267 unsigned int nr_events;
268 struct cds_list_head head; /* chain registered probes */
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269 struct cds_list_head lazy_init_head;
270 int lazy; /* lazy registration */
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271 uint32_t major;
272 uint32_t minor;
37d5e202 273 char padding[LTTNG_UST_PROBE_DESC_PADDING];
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274};
275
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276/* Data structures used by the tracer. */
277
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278enum lttng_enabler_type {
279 LTTNG_ENABLER_WILDCARD,
280 LTTNG_ENABLER_EVENT,
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281};
282
283/*
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284 * Enabler field, within whatever object is enabling an event. Target of
285 * backward reference.
e6c12e3d 286 */
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287struct lttng_enabler {
288 enum lttng_enabler_type type;
289
290 /* head list of struct lttng_ust_filter_bytecode_node */
291 struct cds_list_head filter_bytecode_head;
292 struct cds_list_head node; /* per-session list of enablers */
293
294 struct lttng_ust_event event_param;
295 struct lttng_channel *chan;
296 struct lttng_ctx *ctx;
297 unsigned int enabled:1;
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298};
299
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300struct tp_list_entry {
301 struct lttng_ust_tracepoint_iter tp;
302 struct cds_list_head head;
303};
304
305struct lttng_ust_tracepoint_list {
306 struct tp_list_entry *iter;
307 struct cds_list_head head;
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308};
309
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310struct tp_field_list_entry {
311 struct lttng_ust_field_iter field;
312 struct cds_list_head head;
313};
314
315struct lttng_ust_field_list {
316 struct tp_field_list_entry *iter;
317 struct cds_list_head head;
318};
319
8165c8da 320struct ust_pending_probe;
7dd08bec 321struct lttng_event;
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322
323struct lttng_ust_filter_bytecode_node {
324 struct cds_list_head node;
e58095ef 325 struct lttng_enabler *enabler;
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326 /*
327 * struct lttng_ust_filter_bytecode has var. sized array, must
328 * be last field.
329 */
330 struct lttng_ust_filter_bytecode bc;
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331};
332
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333/*
334 * Filter return value masks.
335 */
336enum lttng_filter_ret {
337 LTTNG_FILTER_DISCARD = 0,
338 LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
339 /* Other bits are kept for future use. */
340};
341
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342struct lttng_bytecode_runtime {
343 /* Associated bytecode */
344 struct lttng_ust_filter_bytecode_node *bc;
8a92ed2a 345 uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
21af05a9 346 int link_failed;
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347 struct cds_list_head node; /* list of bytecode runtime in event */
348};
349
350/*
351 * Objects in a linked-list of enablers, owned by an event.
352 */
353struct lttng_enabler_ref {
354 struct cds_list_head node; /* enabler ref list */
355 struct lttng_enabler *ref; /* backward ref */
f488575f 356};
8165c8da 357
8020ceb5 358/*
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359 * lttng_event structure is referred to by the tracing fast path. It
360 * must be kept small.
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361 *
362 * IMPORTANT: this structure is part of the ABI between the probe and
363 * UST. Fields need to be only added at the end, never reordered, never
364 * removed.
8020ceb5 365 */
7dd08bec 366struct lttng_event {
180901e6 367 /* LTTng-UST 2.0 starts here */
8020ceb5 368 unsigned int id;
7dd08bec 369 struct lttng_channel *chan;
976fe9ea 370 int enabled;
8020ceb5 371 const struct lttng_event_desc *desc;
e58095ef 372 void *_deprecated1;
8020ceb5 373 struct lttng_ctx *ctx;
9f3fdbc6 374 enum lttng_ust_instrumentation instrumentation;
8020ceb5 375 union {
8020ceb5 376 } u;
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377 struct cds_list_head node; /* Event list in session */
378 struct cds_list_head _deprecated2;
379 void *_deprecated3;
13b21cd6 380 unsigned int _deprecated4:1;
e58095ef 381
180901e6 382 /* LTTng-UST 2.1 starts here */
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383 /* list of struct lttng_bytecode_runtime, sorted by seqnum */
384 struct cds_list_head bytecode_runtime_head;
dcdeaff0 385 int has_enablers_without_bytecode;
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386 /* Backward references: list of lttng_enabler_ref (ref to enablers) */
387 struct cds_list_head enablers_ref_head;
d56fa719 388 struct cds_hlist_node hlist; /* session ht of events */
ac6b4ac6 389 int registered; /* has reg'd tracepoint probe */
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390};
391
8d8a24c8 392struct channel;
38fae1d3 393struct lttng_ust_shm_handle;
8d8a24c8 394
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395/*
396 * IMPORTANT: this structure is part of the ABI between the probe and
397 * UST. Fields need to be only added at the end, never reordered, never
398 * removed.
399 */
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400struct lttng_channel_ops {
401 struct lttng_channel *(*channel_create)(const char *name,
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402 void *buf_addr,
403 size_t subbuf_size, size_t num_subbuf,
404 unsigned int switch_timer_interval,
405 unsigned int read_timer_interval,
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406 unsigned char *uuid,
407 uint32_t chan_id);
74d81a6c 408 void (*channel_destroy)(struct lttng_channel *chan);
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409 void *_deprecated1;
410 void *_deprecated2;
4cfec15c 411 int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
8020ceb5 412 uint32_t event_id);
4cfec15c 413 void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
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414 void (*event_write)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
415 const void *src, size_t len);
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416 /*
417 * packet_avail_size returns the available size in the current
418 * packet. Note that the size returned is only a hint, since it
419 * may change due to concurrent writes.
420 */
1d498196 421 size_t (*packet_avail_size)(struct channel *chan,
38fae1d3 422 struct lttng_ust_shm_handle *handle);
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423 //wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
424 //wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
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425 int (*is_finalized)(struct channel *chan);
426 int (*is_disabled)(struct channel *chan);
38fae1d3 427 int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
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428};
429
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430/*
431 * IMPORTANT: this structure is part of the ABI between the probe and
432 * UST. Fields need to be only added at the end, never reordered, never
433 * removed.
434 */
7dd08bec 435struct lttng_channel {
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436 /*
437 * The pointers located in this private data are NOT safe to be
438 * dereferenced by the consumer. The only operations the
439 * consumer process is designed to be allowed to do is to read
440 * and perform subbuffer flush.
441 */
8020ceb5 442 struct channel *chan; /* Channel buffers */
976fe9ea 443 int enabled;
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444 struct lttng_ctx *ctx;
445 /* Event ID management */
7dd08bec 446 struct lttng_session *session;
0a42beb6 447 int objd; /* Object associated to channel */
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448 unsigned int _deprecated1;
449 unsigned int _deprecated2;
e58095ef 450 struct cds_list_head node; /* Channel list in session */
74d81a6c 451 const struct lttng_channel_ops *ops;
8020ceb5 452 int header_type; /* 0: unset, 1: compact, 2: large */
38fae1d3 453 struct lttng_ust_shm_handle *handle; /* shared-memory handle */
13b21cd6 454 unsigned int _deprecated3:1;
a3f61e7f 455
74d81a6c 456 /* Channel ID */
a3f61e7f 457 unsigned int id;
74d81a6c 458 enum lttng_ust_chan_type type;
19d8b1b3 459 unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
ac6b4ac6 460 int tstate:1; /* Transient enable state */
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461};
462
71a9d034 463#define LTTNG_UST_EVENT_HT_BITS 12
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464#define LTTNG_UST_EVENT_HT_SIZE (1U << LTTNG_UST_EVENT_HT_BITS)
465
466struct lttng_ust_event_ht {
467 struct cds_hlist_head table[LTTNG_UST_EVENT_HT_SIZE];
468};
469
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470/*
471 * IMPORTANT: this structure is part of the ABI between the probe and
472 * UST. Fields need to be only added at the end, never reordered, never
473 * removed.
474 */
7dd08bec 475struct lttng_session {
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476 int active; /* Is trace session active ? */
477 int been_active; /* Been active ? */
478 int objd; /* Object associated */
13b21cd6 479 void *_deprecated1;
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480 struct cds_list_head chan_head; /* Channel list head */
481 struct cds_list_head events_head; /* list of events */
13b21cd6 482 struct cds_list_head _deprecated2;
e58095ef 483 struct cds_list_head node; /* Session list */
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484 int _deprecated3;
485 unsigned int _deprecated4:1;
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486
487 /* New UST 2.1 */
488 /* List of enablers */
489 struct cds_list_head enablers_head;
d56fa719 490 struct lttng_ust_event_ht events_ht; /* ht of events */
32ce8569 491 void *owner; /* object owner */
ac6b4ac6 492 int tstate:1; /* Transient enable state */
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493};
494
7dd08bec 495struct lttng_transport {
8020ceb5 496 char *name;
9f3fdbc6 497 struct cds_list_head node;
7dd08bec 498 struct lttng_channel_ops ops;
74d81a6c 499 const struct lttng_ust_lib_ring_buffer_config *client_config;
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500};
501
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502struct lttng_session *lttng_session_create(void);
503int lttng_session_enable(struct lttng_session *session);
504int lttng_session_disable(struct lttng_session *session);
505void lttng_session_destroy(struct lttng_session *session);
8020ceb5 506
7dd08bec 507struct lttng_channel *lttng_channel_create(struct lttng_session *session,
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508 const char *transport_name,
509 void *buf_addr,
510 size_t subbuf_size, size_t num_subbuf,
511 unsigned int switch_timer_interval,
193183fb 512 unsigned int read_timer_interval,
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513 int **shm_fd, int **wait_fd,
514 uint64_t **memory_map_size,
7dd08bec 515 struct lttng_channel *chan_priv_init);
8020ceb5 516
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517int lttng_channel_enable(struct lttng_channel *channel);
518int lttng_channel_disable(struct lttng_channel *channel);
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519
520struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
521 struct lttng_ust_event *event_param,
522 struct lttng_channel *chan);
523int lttng_enabler_enable(struct lttng_enabler *enabler);
524int lttng_enabler_disable(struct lttng_enabler *enabler);
525int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
526 struct lttng_ust_filter_bytecode_node *bytecode);
527int lttng_enabler_attach_context(struct lttng_enabler *enabler,
528 struct lttng_ust_context *ctx);
529
530int lttng_attach_context(struct lttng_ust_context *context_param,
531 struct lttng_ctx **ctx, struct lttng_session *session);
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532void lttng_context_init(void);
533void lttng_context_exit(void);
534struct lttng_ctx *lttng_static_ctx; /* Used by filtering */
976fe9ea 535
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536void lttng_transport_register(struct lttng_transport *transport);
537void lttng_transport_unregister(struct lttng_transport *transport);
8020ceb5 538
4b4de73e 539void synchronize_trace(void);
8020ceb5 540
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541int lttng_probe_register(struct lttng_probe_desc *desc);
542void lttng_probe_unregister(struct lttng_probe_desc *desc);
5f733922 543int lttng_fix_pending_events(void);
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544int lttng_probes_init(void);
545void lttng_probes_exit(void);
8173ec7c 546int lttng_find_context(struct lttng_ctx *ctx, const char *name);
77aa5901 547int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
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548struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
549void lttng_remove_context_field(struct lttng_ctx **ctx_p,
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550 struct lttng_ctx_field *field);
551void lttng_destroy_context(struct lttng_ctx *ctx);
3b402b40 552int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
c1ef86f0 553int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
8173ec7c 554int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
4847e9bb 555int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
a93bfc45 556void lttng_context_vtid_reset(void);
c1ef86f0 557void lttng_context_vpid_reset(void);
9f3fdbc6 558
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559extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
560extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
561extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
c1fca457 562
7dd08bec 563struct lttng_transport *lttng_transport_find(const char *name);
c1fca457 564
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565int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
566void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
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567struct lttng_ust_tracepoint_iter *
568 lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
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569int lttng_probes_get_field_list(struct lttng_ust_field_list *list);
570void lttng_probes_prune_field_list(struct lttng_ust_field_list *list);
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571struct lttng_ust_field_iter *
572 lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list);
c8fcf224 573
7dd08bec 574void lttng_filter_event_link_bytecode(struct lttng_event *event);
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575void lttng_enabler_event_link_bytecode(struct lttng_event *event,
576 struct lttng_enabler *enabler);
7dd08bec 577void lttng_free_event_filter_runtime(struct lttng_event *event);
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578void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
579
580struct cds_list_head *lttng_get_probe_list_head(void);
6715d7d1 581int lttng_session_active(void);
e6c12e3d 582
51489cad 583#endif /* _LTTNG_UST_EVENTS_H */
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