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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
2df37e95 | 3 | * lttng/events.h |
4e3c1b9b | 4 | * |
4e3c1b9b | 5 | * Holds LTTng per-session event registry. |
17baffe2 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4e3c1b9b MD |
8 | */ |
9 | ||
9f36eaed MJ |
10 | #ifndef _LTTNG_EVENTS_H |
11 | #define _LTTNG_EVENTS_H | |
12 | ||
5f4c791e | 13 | #include <lttng/kernel-version.h> |
4e3c1b9b | 14 | #include <linux/list.h> |
d6d808f3 | 15 | #include <linux/kprobes.h> |
d83004aa | 16 | #include <linux/kref.h> |
41f229dc | 17 | #include <linux/uuid.h> |
754d534a | 18 | #include <linux/irq_work.h> |
149b9a9d | 19 | #include <wrapper/uprobes.h> |
2df37e95 MD |
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> | |
4e3c1b9b | 25 | |
e97dc605 | 26 | #define lttng_is_signed_type(type) (((type) -1) < (type) 1) |
9e7e4892 | 27 | |
f7d06400 | 28 | struct lttng_kernel_channel_buffer; |
8cdc1a81 | 29 | struct lttng_kernel_session; |
8a57ec02 | 30 | struct lttng_kernel_ring_buffer_ctx; |
4e3c1b9b | 31 | |
c0edae1d MD |
32 | /* Type description */ |
33 | ||
12bb2edb MD |
34 | enum lttng_kernel_type { |
35 | lttng_kernel_type_integer, | |
36 | lttng_kernel_type_string, | |
437d5aa5 MD |
37 | lttng_kernel_type_enum, |
38 | lttng_kernel_type_array, | |
39 | lttng_kernel_type_sequence, | |
40 | lttng_kernel_type_struct, | |
41 | lttng_kernel_type_variant, | |
12bb2edb | 42 | NR_LTTNG_KERNEL_TYPES, |
c0edae1d MD |
43 | }; |
44 | ||
28cbcb59 MD |
45 | enum lttng_kernel_string_encoding { |
46 | lttng_kernel_string_encoding_none = 0, | |
47 | lttng_kernel_string_encoding_UTF8 = 1, | |
48 | lttng_kernel_string_encoding_ASCII = 2, | |
49 | NR_LTTNG_KERNEL_STRING_ENCODING, | |
c0edae1d MD |
50 | }; |
51 | ||
a28cc520 | 52 | struct lttng_kernel_enum_value { |
141ddf28 MD |
53 | unsigned long long value; |
54 | unsigned int signedness:1; | |
55 | }; | |
56 | ||
a28cc520 MD |
57 | struct lttng_kernel_enum_entry { |
58 | struct lttng_kernel_enum_value start, end; /* start and end are inclusive */ | |
c0edae1d | 59 | const char *string; |
08ad1061 PP |
60 | struct { |
61 | unsigned int is_auto:1; | |
62 | } options; | |
c0edae1d MD |
63 | }; |
64 | ||
437d5aa5 MD |
65 | /* |
66 | * struct lttng_kernel_type_common is fixed-size. Its children inherits | |
67 | * from it by embedding struct lttng_kernel_type_common as its first field. | |
68 | */ | |
69 | struct lttng_kernel_type_common { | |
70 | enum lttng_kernel_type type; | |
71 | }; | |
72 | ||
73 | struct lttng_kernel_type_integer { | |
74 | struct lttng_kernel_type_common parent; | |
c099397a MD |
75 | unsigned int size; /* in bits */ |
76 | unsigned short alignment; /* in bits */ | |
9cccf98a | 77 | unsigned int signedness:1, |
4697aac7 MD |
78 | reverse_byte_order:1, |
79 | user:1; /* fetch from user-space */ | |
e0a7a7c4 | 80 | unsigned int base; /* 2, 8, 10, 16, for pretty print */ |
437d5aa5 MD |
81 | }; |
82 | ||
83 | struct lttng_kernel_type_string { | |
84 | struct lttng_kernel_type_common parent; | |
28cbcb59 | 85 | enum lttng_kernel_string_encoding encoding; |
4697aac7 | 86 | unsigned int user:1; /* fetch from user-space */ |
c099397a MD |
87 | }; |
88 | ||
437d5aa5 MD |
89 | struct lttng_kernel_type_enum { |
90 | struct lttng_kernel_type_common parent; | |
91 | const struct lttng_kernel_enum_desc *desc; /* Enumeration mapping */ | |
92 | const struct lttng_kernel_type_common *container_type; | |
93 | }; | |
94 | ||
95 | struct lttng_kernel_type_array { | |
96 | struct lttng_kernel_type_common parent; | |
97 | const struct lttng_kernel_type_common *elem_type; | |
98 | unsigned int length; /* Num. elems. */ | |
c27937ce | 99 | unsigned int alignment; /* Alignment in bytes before elements. */ |
437d5aa5 MD |
100 | enum lttng_kernel_string_encoding encoding; |
101 | }; | |
102 | ||
103 | struct lttng_kernel_type_sequence { | |
104 | struct lttng_kernel_type_common parent; | |
51ef4536 | 105 | const char *length_name; /* Length field name. If NULL, use previous field. */ |
437d5aa5 | 106 | const struct lttng_kernel_type_common *elem_type; |
c27937ce | 107 | unsigned int alignment; /* Alignment in bytes before elements. */ |
437d5aa5 MD |
108 | enum lttng_kernel_string_encoding encoding; |
109 | }; | |
110 | ||
111 | struct lttng_kernel_type_struct { | |
112 | struct lttng_kernel_type_common parent; | |
113 | unsigned int nr_fields; | |
4f1d1ee5 | 114 | const struct lttng_kernel_event_field * const *fields; /* Array of pointers to fields. */ |
c27937ce | 115 | unsigned int alignment; /* Alignment in bits */ |
437d5aa5 MD |
116 | }; |
117 | ||
118 | struct lttng_kernel_type_variant { | |
119 | struct lttng_kernel_type_common parent; | |
51ef4536 | 120 | const char *tag_name; /* Tag field name. If NULL, use previous field. */ |
4f1d1ee5 | 121 | const struct lttng_kernel_event_field * const *choices; /* Array of pointers to fields. */ |
437d5aa5 | 122 | unsigned int nr_choices; |
c27937ce | 123 | unsigned int alignment; /* Alignment in bytes */ |
c099397a MD |
124 | }; |
125 | ||
d96a4a7a | 126 | struct lttng_kernel_enum_desc { |
c099397a | 127 | const char *name; |
4f1d1ee5 | 128 | const struct lttng_kernel_enum_entry * const *entries; |
141ddf28 | 129 | unsigned int nr_entries; |
6c8c025b | 130 | const struct lttng_kernel_probe_desc *probe_desc; |
c099397a | 131 | }; |
c0edae1d MD |
132 | |
133 | /* Event field description */ | |
134 | ||
437d5aa5 | 135 | struct lttng_kernel_event_field { |
c0edae1d | 136 | const char *name; |
437d5aa5 | 137 | const struct lttng_kernel_type_common *type; |
f127e61e | 138 | unsigned int nowrite:1, /* do not write into trace */ |
ceabb767 | 139 | nofilter:1; /* do not consider for filter */ |
c0edae1d MD |
140 | }; |
141 | ||
9857164a FD |
142 | #ifndef PARAMS |
143 | #define PARAMS(args...) args | |
144 | #endif | |
145 | ||
4697aac7 | 146 | #define _lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, _user, _base) \ |
437d5aa5 MD |
147 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_integer, { \ |
148 | .parent = { \ | |
149 | .type = lttng_kernel_type_integer, \ | |
150 | }, \ | |
151 | .size = (_size), \ | |
152 | .alignment = (_alignment), \ | |
153 | .signedness = (_signedness), \ | |
154 | .reverse_byte_order = (_byte_order) != __BYTE_ORDER, \ | |
4697aac7 | 155 | .user = (_user), \ |
437d5aa5 MD |
156 | .base = (_base), \ |
157 | })) | |
158 | ||
4697aac7 MD |
159 | #define lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, _base) \ |
160 | _lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, 0, _base) | |
161 | ||
162 | #define lttng_kernel_static_type_user_integer(_size, _alignment, _signedness, _byte_order, _base) \ | |
163 | _lttng_kernel_static_type_integer(_size, _alignment, _signedness, _byte_order, 1, _base) | |
164 | ||
165 | #define _lttng_kernel_static_type_integer_from_type(_type, _byte_order, _user, _base) \ | |
6f185e4f | 166 | _lttng_kernel_static_type_integer(sizeof(_type) * CHAR_BIT, \ |
437d5aa5 MD |
167 | lttng_alignof(_type) * CHAR_BIT, \ |
168 | lttng_is_signed_type(_type), \ | |
6f185e4f | 169 | _byte_order, _user, _base) |
437d5aa5 | 170 | |
4697aac7 MD |
171 | #define lttng_kernel_static_type_integer_from_type(_type, _byte_order, _base) \ |
172 | _lttng_kernel_static_type_integer_from_type(_type, _byte_order, 0, _base) | |
173 | ||
174 | #define lttng_kernel_static_type_user_integer_from_type(_type, _byte_order, _base) \ | |
175 | _lttng_kernel_static_type_integer_from_type(_type, _byte_order, 1, _base) | |
176 | ||
437d5aa5 MD |
177 | #define lttng_kernel_static_type_enum(_desc, _container_type) \ |
178 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_enum, { \ | |
179 | .parent = { \ | |
180 | .type = lttng_kernel_type_enum, \ | |
181 | }, \ | |
182 | .desc = (_desc), \ | |
183 | .container_type = (_container_type), \ | |
184 | })) | |
185 | ||
186 | #define lttng_kernel_static_type_array(_length, _elem_type, _alignment, _encoding) \ | |
187 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_array, { \ | |
188 | .parent = { \ | |
189 | .type = lttng_kernel_type_array, \ | |
190 | }, \ | |
191 | .length = (_length), \ | |
192 | .alignment = (_alignment), \ | |
193 | .encoding = lttng_kernel_string_encoding_##_encoding, \ | |
194 | .elem_type = (_elem_type), \ | |
195 | })) | |
196 | ||
197 | #define lttng_kernel_static_type_array_text(_length) \ | |
198 | lttng_kernel_static_type_array(_length, \ | |
199 | lttng_kernel_static_type_integer(sizeof(char) * CHAR_BIT, \ | |
200 | lttng_alignof(char) * CHAR_BIT, lttng_is_signed_type(char), \ | |
201 | __BYTE_ORDER, 10), \ | |
202 | 0, UTF8) | |
203 | ||
204 | #define lttng_kernel_static_type_sequence(_length_name, _elem_type, _alignment, _encoding) \ | |
205 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_sequence, { \ | |
206 | .parent = { \ | |
207 | .type = lttng_kernel_type_sequence, \ | |
208 | }, \ | |
209 | .length_name = (_length_name), \ | |
210 | .alignment = (_alignment), \ | |
211 | .encoding = lttng_kernel_string_encoding_##_encoding, \ | |
212 | .elem_type = (_elem_type), \ | |
213 | })) | |
214 | ||
4697aac7 | 215 | #define lttng_kernel_static_type_string(_encoding, _user) \ |
437d5aa5 MD |
216 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_string, { \ |
217 | .parent = { \ | |
218 | .type = lttng_kernel_type_string, \ | |
219 | }, \ | |
220 | .encoding = lttng_kernel_string_encoding_##_encoding, \ | |
4697aac7 | 221 | .user = (_user), \ |
437d5aa5 MD |
222 | })) |
223 | ||
9857164a FD |
224 | #define lttng_kernel_static_type_struct_init(_nr_fields, _fields, _alignment) \ |
225 | { \ | |
437d5aa5 MD |
226 | .parent = { \ |
227 | .type = lttng_kernel_type_struct, \ | |
228 | }, \ | |
229 | .nr_fields = (_nr_fields), \ | |
230 | .fields = _fields, \ | |
231 | .alignment = (_alignment), \ | |
9857164a FD |
232 | } |
233 | ||
234 | #define lttng_kernel_static_type_struct(_nr_fields, _fields, _alignment) \ | |
235 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_struct, \ | |
236 | lttng_kernel_static_type_struct_init(_nr_fields, PARAMS(_fields), _alignment) \ | |
237 | )) | |
437d5aa5 MD |
238 | |
239 | #define lttng_kernel_static_type_variant(_nr_choices, _choices, _tag_name, _alignment) \ | |
240 | ((const struct lttng_kernel_type_common *) __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_type_variant, { \ | |
241 | .parent = { \ | |
242 | .type = lttng_kernel_type_variant, \ | |
243 | }, \ | |
244 | .tag_name = (_tag_name), \ | |
245 | .choices = _choices, \ | |
246 | .nr_choices = (_nr_choices), \ | |
247 | .alignment = (_alignment), \ | |
248 | })) | |
249 | ||
4697aac7 | 250 | #define lttng_kernel_static_event_field(_name, _type, _nowrite, _nofilter) \ |
437d5aa5 MD |
251 | __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field, { \ |
252 | .name = (_name), \ | |
253 | .type = (_type), \ | |
254 | .nowrite = (_nowrite), \ | |
437d5aa5 MD |
255 | .nofilter = (_nofilter), \ |
256 | }) | |
257 | ||
258 | #define lttng_kernel_static_event_field_array(_fields...) \ | |
259 | __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_event_field *, \ | |
260 | _fields \ | |
261 | ) | |
262 | ||
437d5aa5 MD |
263 | #define lttng_kernel_static_enum_entry_value(_string, _value) \ |
264 | __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, { \ | |
265 | .start = { \ | |
266 | .signedness = lttng_is_signed_type(__typeof__(_value)), \ | |
267 | .value = lttng_is_signed_type(__typeof__(_value)) ? \ | |
268 | (long long) (_value) : (_value), \ | |
269 | }, \ | |
270 | .end = { \ | |
271 | .signedness = lttng_is_signed_type(__typeof__(_value)), \ | |
272 | .value = lttng_is_signed_type(__typeof__(_value)) ? \ | |
273 | (long long) (_value) : (_value), \ | |
274 | }, \ | |
275 | .string = (_string), \ | |
276 | }), | |
277 | ||
278 | #define lttng_kernel_static_enum_entry_range(_string, _range_start, _range_end) \ | |
279 | __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, { \ | |
280 | .start = { \ | |
281 | .signedness = lttng_is_signed_type(__typeof__(_range_start)), \ | |
282 | .value = lttng_is_signed_type(__typeof__(_range_start)) ? \ | |
283 | (long long) (_range_start) : (_range_start), \ | |
284 | }, \ | |
285 | .end = { \ | |
286 | .signedness = lttng_is_signed_type(__typeof__(_range_end)), \ | |
287 | .value = lttng_is_signed_type(__typeof__(_range_end)) ? \ | |
288 | (long long) (_range_end) : (_range_end), \ | |
289 | }, \ | |
290 | .string = (_string), \ | |
291 | }), | |
292 | ||
293 | #define lttng_kernel_static_enum_entry_auto(_string) \ | |
294 | __LTTNG_COMPOUND_LITERAL(const struct lttng_kernel_enum_entry, { \ | |
295 | .start = { \ | |
296 | .signedness = -1, \ | |
297 | .value = -1, \ | |
298 | }, \ | |
299 | .end = { \ | |
300 | .signedness = -1, \ | |
301 | .value = -1, \ | |
302 | }, \ | |
303 | .string = (_string), \ | |
304 | .options = { \ | |
305 | .is_auto = 1, \ | |
306 | } \ | |
307 | }), | |
308 | ||
a92e844e | 309 | struct lttng_kernel_probe_ctx { |
e2d5dbc7 | 310 | struct lttng_kernel_event_common *event; |
79150a49 JD |
311 | uint8_t interruptible; |
312 | }; | |
313 | ||
6c8c025b MD |
314 | struct lttng_kernel_tracepoint_class { |
315 | void (*probe_callback)(void); | |
4f1d1ee5 | 316 | const struct lttng_kernel_event_field * const *fields; /* event payload */ |
6c8c025b MD |
317 | unsigned int nr_fields; |
318 | const struct lttng_kernel_probe_desc *probe_desc; | |
319 | }; | |
320 | ||
437d5aa5 MD |
321 | struct lttng_kernel_event_desc { |
322 | const char *event_name; /* lttng-modules name */ | |
323 | const char *event_kname; /* Linux kernel name (tracepoints) */ | |
324 | const struct lttng_kernel_probe_desc *probe_desc; | |
6c8c025b | 325 | const struct lttng_kernel_tracepoint_class *tp_class; |
dc7f600a | 326 | struct module *owner; |
c0edae1d MD |
327 | }; |
328 | ||
437d5aa5 MD |
329 | struct lttng_kernel_probe_desc { |
330 | const char *provider_name; | |
4f1d1ee5 | 331 | const struct lttng_kernel_event_desc * const *event_desc; |
85a9ca7f MD |
332 | unsigned int nr_events; |
333 | struct list_head head; /* chain registered probes */ | |
3c997079 MD |
334 | struct list_head lazy_init_head; |
335 | int lazy; /* lazy registration */ | |
85a9ca7f MD |
336 | }; |
337 | ||
8a445457 MD |
338 | /* |
339 | * Result of the run_filter() callback. | |
340 | */ | |
341 | enum lttng_kernel_event_filter_result { | |
342 | LTTNG_KERNEL_EVENT_FILTER_ACCEPT = 0, | |
343 | LTTNG_KERNEL_EVENT_FILTER_REJECT = 1, | |
344 | }; | |
345 | ||
a67ba386 MD |
346 | struct lttng_kernel_event_common_private; |
347 | ||
348 | enum lttng_kernel_event_type { | |
349 | LTTNG_KERNEL_EVENT_TYPE_RECORDER = 0, | |
350 | LTTNG_KERNEL_EVENT_TYPE_NOTIFIER = 1, | |
351 | }; | |
352 | ||
353 | struct lttng_kernel_event_common { | |
354 | struct lttng_kernel_event_common_private *priv; /* Private event interface */ | |
355 | ||
356 | enum lttng_kernel_event_type type; | |
357 | /* Get child with container_of(). */ | |
358 | ||
e64957da | 359 | int enabled; |
a67ba386 | 360 | int eval_filter; /* Need to evaluate filters */ |
8a445457 | 361 | int (*run_filter)(const struct lttng_kernel_event_common *event, |
a67ba386 | 362 | const char *stack_data, |
a92e844e | 363 | struct lttng_kernel_probe_ctx *probe_ctx, |
a67ba386 | 364 | void *filter_ctx); |
3c997079 MD |
365 | }; |
366 | ||
a67ba386 MD |
367 | struct lttng_kernel_event_recorder_private; |
368 | ||
369 | struct lttng_kernel_event_recorder { | |
370 | struct lttng_kernel_event_common parent; | |
371 | struct lttng_kernel_event_recorder_private *priv; /* Private event record interface */ | |
372 | ||
f7d06400 | 373 | struct lttng_kernel_channel_buffer *chan; |
c3eddb2e MD |
374 | }; |
375 | ||
a67ba386 MD |
376 | struct lttng_kernel_notification_ctx { |
377 | int eval_capture; /* Capture evaluation available. */ | |
378 | }; | |
dffef45d | 379 | |
a67ba386 | 380 | struct lttng_kernel_event_notifier_private; |
8a8ac9a8 | 381 | |
a67ba386 MD |
382 | struct lttng_kernel_event_notifier { |
383 | struct lttng_kernel_event_common parent; | |
384 | struct lttng_kernel_event_notifier_private *priv; /* Private event notifier interface */ | |
dffef45d | 385 | |
a67ba386 MD |
386 | int eval_capture; /* Need to evaluate capture */ |
387 | void (*notification_send)(struct lttng_kernel_event_notifier *event_notifier, | |
a67ba386 | 388 | const char *stack_data, |
a92e844e | 389 | struct lttng_kernel_probe_ctx *probe_ctx, |
a67ba386 | 390 | struct lttng_kernel_notification_ctx *notif_ctx); |
dffef45d FD |
391 | }; |
392 | ||
4a399b76 MD |
393 | struct lttng_kernel_channel_buffer_ops { |
394 | struct lttng_kernel_channel_buffer_ops_private *priv; /* Private channel buffer ops interface. */ | |
395 | ||
8a57ec02 MD |
396 | int (*event_reserve)(struct lttng_kernel_ring_buffer_ctx *ctx); |
397 | void (*event_commit)(struct lttng_kernel_ring_buffer_ctx *ctx); | |
398 | void (*event_write)(struct lttng_kernel_ring_buffer_ctx *ctx, const void *src, | |
f5ffbd77 | 399 | size_t len, size_t alignment); |
8a57ec02 | 400 | void (*event_write_from_user)(struct lttng_kernel_ring_buffer_ctx *ctx, |
f5ffbd77 | 401 | const void *src, size_t len, size_t alignment); |
8a57ec02 | 402 | void (*event_memset)(struct lttng_kernel_ring_buffer_ctx *ctx, |
58aa5d24 | 403 | int c, size_t len); |
8a57ec02 | 404 | void (*event_strcpy)(struct lttng_kernel_ring_buffer_ctx *ctx, const char *src, |
16f78f3a | 405 | size_t len); |
8a57ec02 | 406 | void (*event_strcpy_from_user)(struct lttng_kernel_ring_buffer_ctx *ctx, |
16f78f3a | 407 | const char __user *src, size_t len); |
0d1080f4 MD |
408 | void (*event_pstrcpy_pad)(struct lttng_kernel_ring_buffer_ctx *ctx, |
409 | const char *src, size_t len); | |
410 | void (*event_pstrcpy_pad_from_user)(struct lttng_kernel_ring_buffer_ctx *ctx, | |
411 | const char __user *src, size_t len); | |
f7d06400 MD |
412 | void (*lost_event_too_big)(struct lttng_kernel_channel_buffer *lttng_channel); |
413 | }; | |
414 | ||
415 | enum lttng_kernel_channel_type { | |
416 | LTTNG_KERNEL_CHANNEL_TYPE_BUFFER = 0, | |
85a9ca7f MD |
417 | }; |
418 | ||
f7d06400 MD |
419 | struct lttng_kernel_channel_common_private; |
420 | ||
421 | /* Use container_of() to get child. */ | |
422 | struct lttng_kernel_channel_common { | |
423 | struct lttng_kernel_channel_common_private *priv; /* Private channel interface. */ | |
424 | ||
425 | enum lttng_kernel_channel_type type; | |
426 | ||
e64957da | 427 | int enabled; |
8cdc1a81 | 428 | struct lttng_kernel_session *session; |
f7d06400 MD |
429 | }; |
430 | ||
431 | struct lttng_kernel_channel_buffer_private; | |
432 | ||
433 | struct lttng_kernel_channel_buffer { | |
434 | struct lttng_kernel_channel_common parent; | |
435 | struct lttng_kernel_channel_buffer_private *priv; | |
436 | ||
4a399b76 | 437 | struct lttng_kernel_channel_buffer_ops *ops; |
85a9ca7f MD |
438 | }; |
439 | ||
114667d5 MD |
440 | #define LTTNG_DYNAMIC_LEN_STACK_SIZE 128 |
441 | ||
442 | struct lttng_dynamic_len_stack { | |
443 | size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE]; | |
444 | size_t offset; | |
445 | }; | |
446 | ||
447 | DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack); | |
e0130fab MD |
448 | |
449 | /* | |
8c0393c3 | 450 | * struct lttng_kernel_id_tracker declared in header due to deferencing of *v |
e0130fab MD |
451 | * in RCU_INITIALIZER(v). |
452 | */ | |
d1f652f8 MD |
453 | #define LTTNG_ID_HASH_BITS 6 |
454 | #define LTTNG_ID_TABLE_SIZE (1 << LTTNG_ID_HASH_BITS) | |
e0130fab | 455 | |
8c0393c3 | 456 | struct lttng_kernel_id_tracker_rcu { |
d1f652f8 MD |
457 | struct hlist_head id_hash[LTTNG_ID_TABLE_SIZE]; |
458 | }; | |
459 | ||
8c0393c3 MD |
460 | struct lttng_kernel_id_tracker { |
461 | struct lttng_kernel_id_tracker_private *priv; /* Private API */ | |
462 | ||
463 | struct lttng_kernel_id_tracker_rcu *p; /* RCU dereferenced. */ | |
e0130fab MD |
464 | }; |
465 | ||
8cdc1a81 MD |
466 | struct lttng_kernel_session_private; |
467 | ||
468 | struct lttng_kernel_session { | |
469 | struct lttng_kernel_session_private *priv; /* Private session interface */ | |
470 | ||
85a9ca7f | 471 | int active; /* Is trace session active ? */ |
8cdc1a81 | 472 | |
8c0393c3 MD |
473 | struct lttng_kernel_id_tracker pid_tracker; |
474 | struct lttng_kernel_id_tracker vpid_tracker; | |
475 | struct lttng_kernel_id_tracker uid_tracker; | |
476 | struct lttng_kernel_id_tracker vuid_tracker; | |
477 | struct lttng_kernel_id_tracker gid_tracker; | |
478 | struct lttng_kernel_id_tracker vgid_tracker; | |
85a9ca7f MD |
479 | }; |
480 | ||
d1769981 MD |
481 | int lttng_kernel_probe_register(struct lttng_kernel_probe_desc *desc); |
482 | void lttng_kernel_probe_unregister(struct lttng_kernel_probe_desc *desc); | |
d83004aa | 483 | |
8c0393c3 | 484 | bool lttng_id_tracker_lookup(struct lttng_kernel_id_tracker_rcu *p, int id); |
271b6681 | 485 | |
a90917c3 | 486 | #endif /* _LTTNG_EVENTS_H */ |