17dd8d3a3c312ef35da53f4cbbdd4aba75d4a2f7
[deliverable/lttng-modules.git] / lttng-events.h
1 #ifndef _LTTNG_EVENTS_H
2 #define _LTTNG_EVENTS_H
3
4 /*
5 * lttng-events.h
6 *
7 * Holds LTTng per-session event registry.
8 *
9 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; only
14 * version 2.1 of the License.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 #include <linux/version.h>
27 #include <linux/list.h>
28 #include <linux/kprobes.h>
29 #include <linux/kref.h>
30 #include <lttng-cpuhotplug.h>
31 #include <wrapper/uuid.h>
32 #include <lttng-tracer.h>
33 #include <lttng-abi.h>
34 #include <lttng-abi-old.h>
35
36 #define lttng_is_signed_type(type) (((type)(-1)) < 0)
37
38 struct lttng_channel;
39 struct lttng_session;
40 struct lttng_metadata_cache;
41 struct lib_ring_buffer_ctx;
42 struct perf_event;
43 struct perf_event_attr;
44 struct lib_ring_buffer_config;
45
46 /* Type description */
47
48 enum abstract_types {
49 atype_integer,
50 atype_enum,
51 atype_array,
52 atype_sequence,
53 atype_string,
54 atype_struct,
55 atype_array_compound, /* Array of compound types. */
56 atype_sequence_compound, /* Sequence of compound types. */
57 atype_variant,
58 NR_ABSTRACT_TYPES,
59 };
60
61 enum lttng_string_encodings {
62 lttng_encode_none = 0,
63 lttng_encode_UTF8 = 1,
64 lttng_encode_ASCII = 2,
65 NR_STRING_ENCODINGS,
66 };
67
68 enum channel_type {
69 PER_CPU_CHANNEL,
70 METADATA_CHANNEL,
71 };
72
73 struct lttng_enum_value {
74 unsigned long long value;
75 unsigned int signedness:1;
76 };
77
78 struct lttng_enum_entry {
79 struct lttng_enum_value start, end; /* start and end are inclusive */
80 const char *string;
81 struct {
82 unsigned int is_auto:1;
83 } options;
84 };
85
86 #define __type_integer(_type, _size, _alignment, _signedness, \
87 _byte_order, _base, _encoding) \
88 { \
89 .atype = atype_integer, \
90 .u.basic.integer = \
91 { \
92 .size = (_size) ? : sizeof(_type) * CHAR_BIT, \
93 .alignment = (_alignment) ? : lttng_alignof(_type) * CHAR_BIT, \
94 .signedness = (_signedness) >= 0 ? (_signedness) : lttng_is_signed_type(_type), \
95 .reverse_byte_order = _byte_order != __BYTE_ORDER, \
96 .base = _base, \
97 .encoding = lttng_encode_##_encoding, \
98 }, \
99 } \
100
101 struct lttng_integer_type {
102 unsigned int size; /* in bits */
103 unsigned short alignment; /* in bits */
104 unsigned int signedness:1,
105 reverse_byte_order:1;
106 unsigned int base; /* 2, 8, 10, 16, for pretty print */
107 enum lttng_string_encodings encoding;
108 };
109
110 union _lttng_basic_type {
111 struct lttng_integer_type integer;
112 struct {
113 const struct lttng_enum_desc *desc; /* Enumeration mapping */
114 struct lttng_integer_type container_type;
115 } enumeration;
116 struct {
117 enum lttng_string_encodings encoding;
118 } string;
119 };
120
121 struct lttng_basic_type {
122 enum abstract_types atype;
123 union {
124 union _lttng_basic_type basic;
125 } u;
126 };
127
128 struct lttng_type {
129 enum abstract_types atype;
130 union {
131 union _lttng_basic_type basic;
132 struct {
133 struct lttng_basic_type elem_type;
134 unsigned int length; /* num. elems. */
135 unsigned int elem_alignment; /* alignment override */
136 } array;
137 struct {
138 struct lttng_basic_type length_type;
139 struct lttng_basic_type elem_type;
140 unsigned int elem_alignment; /* alignment override */
141 } sequence;
142 struct {
143 uint32_t nr_fields;
144 struct lttng_event_field *fields; /* Array of fields. */
145 } _struct;
146 struct {
147 struct lttng_type *elem_type;
148 unsigned int length; /* num. elems. */
149 } array_compound;
150 struct {
151 struct lttng_type *elem_type;
152 const char *length_name;
153 } sequence_compound;
154 struct {
155 const char *tag_name;
156 struct lttng_event_field *choices; /* Array of fields. */
157 uint32_t nr_choices;
158 } variant;
159 } u;
160 };
161
162 struct lttng_enum_desc {
163 const char *name;
164 const struct lttng_enum_entry *entries;
165 unsigned int nr_entries;
166 };
167
168 /* Event field description */
169
170 struct lttng_event_field {
171 const char *name;
172 struct lttng_type type;
173 unsigned int nowrite:1, /* do not write into trace */
174 user:1; /* fetch from user-space */
175 };
176
177 union lttng_ctx_value {
178 int64_t s64;
179 const char *str;
180 double d;
181 };
182
183 /*
184 * We need to keep this perf counter field separately from struct
185 * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
186 */
187 struct lttng_perf_counter_field {
188 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
189 struct lttng_cpuhp_node cpuhp_prepare;
190 struct lttng_cpuhp_node cpuhp_online;
191 #else
192 struct notifier_block nb;
193 int hp_enable;
194 #endif
195 struct perf_event_attr *attr;
196 struct perf_event **e; /* per-cpu array */
197 };
198
199 struct lttng_probe_ctx {
200 struct lttng_event *event;
201 uint8_t interruptible;
202 };
203
204 struct lttng_ctx_field {
205 struct lttng_event_field event_field;
206 size_t (*get_size)(size_t offset);
207 void (*record)(struct lttng_ctx_field *field,
208 struct lib_ring_buffer_ctx *ctx,
209 struct lttng_channel *chan);
210 void (*get_value)(struct lttng_ctx_field *field,
211 struct lttng_probe_ctx *lttng_probe_ctx,
212 union lttng_ctx_value *value);
213 union {
214 struct lttng_perf_counter_field *perf_counter;
215 } u;
216 void (*destroy)(struct lttng_ctx_field *field);
217 };
218
219 struct lttng_ctx {
220 struct lttng_ctx_field *fields;
221 unsigned int nr_fields;
222 unsigned int allocated_fields;
223 size_t largest_align; /* in bytes */
224 };
225
226 struct lttng_event_desc {
227 const char *name; /* lttng-modules name */
228 const char *kname; /* Linux kernel name (tracepoints) */
229 void *probe_callback;
230 const struct lttng_event_ctx *ctx; /* context */
231 const struct lttng_event_field *fields; /* event payload */
232 unsigned int nr_fields;
233 struct module *owner;
234 };
235
236 struct lttng_probe_desc {
237 const char *provider;
238 const struct lttng_event_desc **event_desc;
239 unsigned int nr_events;
240 struct list_head head; /* chain registered probes */
241 struct list_head lazy_init_head;
242 int lazy; /* lazy registration */
243 };
244
245 struct lttng_krp; /* Kretprobe handling */
246
247 enum lttng_event_type {
248 LTTNG_TYPE_EVENT = 0,
249 LTTNG_TYPE_ENABLER = 1,
250 };
251
252 struct lttng_filter_bytecode_node {
253 struct list_head node;
254 struct lttng_enabler *enabler;
255 /*
256 * struct lttng_kernel_filter_bytecode has var. sized array, must be
257 * last field.
258 */
259 struct lttng_kernel_filter_bytecode bc;
260 };
261
262 /*
263 * Filter return value masks.
264 */
265 enum lttng_filter_ret {
266 LTTNG_FILTER_DISCARD = 0,
267 LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
268 /* Other bits are kept for future use. */
269 };
270
271 struct lttng_bytecode_runtime {
272 /* Associated bytecode */
273 struct lttng_filter_bytecode_node *bc;
274 uint64_t (*filter)(void *filter_data, struct lttng_probe_ctx *lttng_probe_ctx,
275 const char *filter_stack_data);
276 int link_failed;
277 struct list_head node; /* list of bytecode runtime in event */
278 };
279
280 /*
281 * Objects in a linked-list of enablers, owned by an event.
282 */
283 struct lttng_enabler_ref {
284 struct list_head node; /* enabler ref list */
285 struct lttng_enabler *ref; /* backward ref */
286 };
287
288 /*
289 * lttng_event structure is referred to by the tracing fast path. It must be
290 * kept small.
291 */
292 struct lttng_event {
293 enum lttng_event_type evtype; /* First field. */
294 unsigned int id;
295 struct lttng_channel *chan;
296 int enabled;
297 const struct lttng_event_desc *desc;
298 void *filter;
299 struct lttng_ctx *ctx;
300 enum lttng_kernel_instrumentation instrumentation;
301 union {
302 struct {
303 struct kprobe kp;
304 char *symbol_name;
305 } kprobe;
306 struct {
307 struct lttng_krp *lttng_krp;
308 char *symbol_name;
309 } kretprobe;
310 struct {
311 char *symbol_name;
312 } ftrace;
313 } u;
314 struct list_head list; /* Event list in session */
315 unsigned int metadata_dumped:1;
316
317 /* Backward references: list of lttng_enabler_ref (ref to enablers) */
318 struct list_head enablers_ref_head;
319 struct hlist_node hlist; /* session ht of events */
320 int registered; /* has reg'd tracepoint probe */
321 /* list of struct lttng_bytecode_runtime, sorted by seqnum */
322 struct list_head bytecode_runtime_head;
323 int has_enablers_without_bytecode;
324 };
325
326 enum lttng_enabler_type {
327 LTTNG_ENABLER_STAR_GLOB,
328 LTTNG_ENABLER_NAME,
329 };
330
331 /*
332 * Enabler field, within whatever object is enabling an event. Target of
333 * backward reference.
334 */
335 struct lttng_enabler {
336 enum lttng_event_type evtype; /* First field. */
337
338 enum lttng_enabler_type type;
339
340 struct list_head node; /* per-session list of enablers */
341 /* head list of struct lttng_ust_filter_bytecode_node */
342 struct list_head filter_bytecode_head;
343
344 struct lttng_kernel_event event_param;
345 struct lttng_channel *chan;
346 struct lttng_ctx *ctx;
347 unsigned int enabled:1;
348 };
349
350 struct lttng_channel_ops {
351 struct channel *(*channel_create)(const char *name,
352 struct lttng_channel *lttng_chan,
353 void *buf_addr,
354 size_t subbuf_size, size_t num_subbuf,
355 unsigned int switch_timer_interval,
356 unsigned int read_timer_interval);
357 void (*channel_destroy)(struct channel *chan);
358 struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
359 int (*buffer_has_read_closed_stream)(struct channel *chan);
360 void (*buffer_read_close)(struct lib_ring_buffer *buf);
361 int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
362 uint32_t event_id);
363 void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
364 void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
365 size_t len);
366 void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
367 const void *src, size_t len);
368 void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
369 int c, size_t len);
370 void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
371 size_t len);
372 void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
373 const char __user *src, size_t len);
374 /*
375 * packet_avail_size returns the available size in the current
376 * packet. Note that the size returned is only a hint, since it
377 * may change due to concurrent writes.
378 */
379 size_t (*packet_avail_size)(struct channel *chan);
380 wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
381 wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
382 int (*is_finalized)(struct channel *chan);
383 int (*is_disabled)(struct channel *chan);
384 int (*timestamp_begin) (const struct lib_ring_buffer_config *config,
385 struct lib_ring_buffer *bufb,
386 uint64_t *timestamp_begin);
387 int (*timestamp_end) (const struct lib_ring_buffer_config *config,
388 struct lib_ring_buffer *bufb,
389 uint64_t *timestamp_end);
390 int (*events_discarded) (const struct lib_ring_buffer_config *config,
391 struct lib_ring_buffer *bufb,
392 uint64_t *events_discarded);
393 int (*content_size) (const struct lib_ring_buffer_config *config,
394 struct lib_ring_buffer *bufb,
395 uint64_t *content_size);
396 int (*packet_size) (const struct lib_ring_buffer_config *config,
397 struct lib_ring_buffer *bufb,
398 uint64_t *packet_size);
399 int (*stream_id) (const struct lib_ring_buffer_config *config,
400 struct lib_ring_buffer *bufb,
401 uint64_t *stream_id);
402 int (*current_timestamp) (const struct lib_ring_buffer_config *config,
403 struct lib_ring_buffer *bufb,
404 uint64_t *ts);
405 int (*sequence_number) (const struct lib_ring_buffer_config *config,
406 struct lib_ring_buffer *bufb,
407 uint64_t *seq);
408 int (*instance_id) (const struct lib_ring_buffer_config *config,
409 struct lib_ring_buffer *bufb,
410 uint64_t *id);
411 };
412
413 struct lttng_transport {
414 char *name;
415 struct module *owner;
416 struct list_head node;
417 struct lttng_channel_ops ops;
418 };
419
420 struct lttng_syscall_filter;
421
422 #define LTTNG_EVENT_HT_BITS 12
423 #define LTTNG_EVENT_HT_SIZE (1U << LTTNG_EVENT_HT_BITS)
424
425 struct lttng_event_ht {
426 struct hlist_head table[LTTNG_EVENT_HT_SIZE];
427 };
428
429 struct lttng_channel {
430 unsigned int id;
431 struct channel *chan; /* Channel buffers */
432 int enabled;
433 struct lttng_ctx *ctx;
434 /* Event ID management */
435 struct lttng_session *session;
436 struct file *file; /* File associated to channel */
437 unsigned int free_event_id; /* Next event ID to allocate */
438 struct list_head list; /* Channel list */
439 struct lttng_channel_ops *ops;
440 struct lttng_transport *transport;
441 struct lttng_event **sc_table; /* for syscall tracing */
442 struct lttng_event **compat_sc_table;
443 struct lttng_event **sc_exit_table; /* for syscall exit tracing */
444 struct lttng_event **compat_sc_exit_table;
445 struct lttng_event *sc_unknown; /* for unknown syscalls */
446 struct lttng_event *sc_compat_unknown;
447 struct lttng_event *sc_exit_unknown;
448 struct lttng_event *compat_sc_exit_unknown;
449 struct lttng_syscall_filter *sc_filter;
450 int header_type; /* 0: unset, 1: compact, 2: large */
451 enum channel_type channel_type;
452 unsigned int metadata_dumped:1,
453 sys_enter_registered:1,
454 sys_exit_registered:1,
455 syscall_all:1,
456 tstate:1; /* Transient enable state */
457 };
458
459 struct lttng_metadata_stream {
460 void *priv; /* Ring buffer private data */
461 struct lttng_metadata_cache *metadata_cache;
462 unsigned int metadata_in; /* Bytes read from the cache */
463 unsigned int metadata_out; /* Bytes consumed from stream */
464 int finalized; /* Has channel been finalized */
465 wait_queue_head_t read_wait; /* Reader buffer-level wait queue */
466 struct list_head list; /* Stream list */
467 struct lttng_transport *transport;
468 uint64_t version; /* Current version of the metadata cache */
469 };
470
471 #define LTTNG_DYNAMIC_LEN_STACK_SIZE 128
472
473 struct lttng_dynamic_len_stack {
474 size_t stack[LTTNG_DYNAMIC_LEN_STACK_SIZE];
475 size_t offset;
476 };
477
478 DECLARE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
479
480 /*
481 * struct lttng_pid_tracker declared in header due to deferencing of *v
482 * in RCU_INITIALIZER(v).
483 */
484 #define LTTNG_PID_HASH_BITS 6
485 #define LTTNG_PID_TABLE_SIZE (1 << LTTNG_PID_HASH_BITS)
486
487 struct lttng_pid_tracker {
488 struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
489 };
490
491 struct lttng_pid_hash_node {
492 struct hlist_node hlist;
493 int pid;
494 };
495
496 struct lttng_session {
497 int active; /* Is trace session active ? */
498 int been_active; /* Has trace session been active ? */
499 struct file *file; /* File associated to session */
500 struct list_head chan; /* Channel list head */
501 struct list_head events; /* Event list head */
502 struct list_head list; /* Session list */
503 unsigned int free_chan_id; /* Next chan ID to allocate */
504 uuid_le uuid; /* Trace session unique ID */
505 struct lttng_metadata_cache *metadata_cache;
506 struct lttng_pid_tracker *pid_tracker;
507 unsigned int metadata_dumped:1,
508 tstate:1; /* Transient enable state */
509 /* List of enablers */
510 struct list_head enablers_head;
511 /* Hash table of events */
512 struct lttng_event_ht events_ht;
513 };
514
515 struct lttng_metadata_cache {
516 char *data; /* Metadata cache */
517 unsigned int cache_alloc; /* Metadata allocated size (bytes) */
518 unsigned int metadata_written; /* Number of bytes written in metadata cache */
519 struct kref refcount; /* Metadata cache usage */
520 struct list_head metadata_stream; /* Metadata stream list */
521 uuid_le uuid; /* Trace session unique ID (copy) */
522 struct mutex lock; /* Produce/consume lock */
523 uint64_t version; /* Current version of the metadata */
524 };
525
526 void lttng_lock_sessions(void);
527 void lttng_unlock_sessions(void);
528
529 struct list_head *lttng_get_probe_list_head(void);
530
531 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
532 struct lttng_kernel_event *event_param,
533 struct lttng_channel *chan);
534
535 int lttng_enabler_enable(struct lttng_enabler *enabler);
536 int lttng_enabler_disable(struct lttng_enabler *enabler);
537 int lttng_fix_pending_events(void);
538 int lttng_session_active(void);
539
540 struct lttng_session *lttng_session_create(void);
541 int lttng_session_enable(struct lttng_session *session);
542 int lttng_session_disable(struct lttng_session *session);
543 void lttng_session_destroy(struct lttng_session *session);
544 int lttng_session_metadata_regenerate(struct lttng_session *session);
545 int lttng_session_statedump(struct lttng_session *session);
546 void metadata_cache_destroy(struct kref *kref);
547
548 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
549 const char *transport_name,
550 void *buf_addr,
551 size_t subbuf_size, size_t num_subbuf,
552 unsigned int switch_timer_interval,
553 unsigned int read_timer_interval,
554 enum channel_type channel_type);
555 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
556 int overwrite, void *buf_addr,
557 size_t subbuf_size, size_t num_subbuf,
558 unsigned int switch_timer_interval,
559 unsigned int read_timer_interval);
560
561 void lttng_metadata_channel_destroy(struct lttng_channel *chan);
562 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
563 struct lttng_kernel_event *event_param,
564 void *filter,
565 const struct lttng_event_desc *event_desc,
566 enum lttng_kernel_instrumentation itype);
567 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
568 struct lttng_kernel_event *event_param,
569 void *filter,
570 const struct lttng_event_desc *event_desc,
571 enum lttng_kernel_instrumentation itype);
572 struct lttng_event *lttng_event_compat_old_create(struct lttng_channel *chan,
573 struct lttng_kernel_old_event *old_event_param,
574 void *filter,
575 const struct lttng_event_desc *internal_desc);
576
577 int lttng_channel_enable(struct lttng_channel *channel);
578 int lttng_channel_disable(struct lttng_channel *channel);
579 int lttng_event_enable(struct lttng_event *event);
580 int lttng_event_disable(struct lttng_event *event);
581
582 void lttng_transport_register(struct lttng_transport *transport);
583 void lttng_transport_unregister(struct lttng_transport *transport);
584
585 void synchronize_trace(void);
586 int lttng_abi_init(void);
587 int lttng_abi_compat_old_init(void);
588 void lttng_abi_exit(void);
589 void lttng_abi_compat_old_exit(void);
590
591 int lttng_probe_register(struct lttng_probe_desc *desc);
592 void lttng_probe_unregister(struct lttng_probe_desc *desc);
593 const struct lttng_event_desc *lttng_event_get(const char *name);
594 void lttng_event_put(const struct lttng_event_desc *desc);
595 int lttng_probes_init(void);
596 void lttng_probes_exit(void);
597
598 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
599 struct channel *chan);
600
601 int lttng_pid_tracker_get_node_pid(const struct lttng_pid_hash_node *node);
602 struct lttng_pid_tracker *lttng_pid_tracker_create(void);
603 void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
604 bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
605 int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
606 int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
607
608 int lttng_session_track_pid(struct lttng_session *session, int pid);
609 int lttng_session_untrack_pid(struct lttng_session *session, int pid);
610
611 int lttng_session_list_tracker_pids(struct lttng_session *session);
612
613 void lttng_clock_ref(void);
614 void lttng_clock_unref(void);
615
616 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
617 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
618 int lttng_syscalls_unregister(struct lttng_channel *chan);
619 int lttng_syscall_filter_enable(struct lttng_channel *chan,
620 const char *name);
621 int lttng_syscall_filter_disable(struct lttng_channel *chan,
622 const char *name);
623 long lttng_channel_syscall_mask(struct lttng_channel *channel,
624 struct lttng_kernel_syscall_mask __user *usyscall_mask);
625 #else
626 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
627 {
628 return -ENOSYS;
629 }
630
631 static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
632 {
633 return 0;
634 }
635
636 static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
637 const char *name)
638 {
639 return -ENOSYS;
640 }
641
642 static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
643 const char *name)
644 {
645 return -ENOSYS;
646 }
647
648 static inline long lttng_channel_syscall_mask(struct lttng_channel *channel,
649 struct lttng_kernel_syscall_mask __user *usyscall_mask)
650 {
651 return -ENOSYS;
652 }
653 #endif
654
655 void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
656 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
657 struct lttng_kernel_filter_bytecode __user *bytecode);
658 void lttng_enabler_event_link_bytecode(struct lttng_event *event,
659 struct lttng_enabler *enabler);
660
661 int lttng_probes_init(void);
662
663 extern struct lttng_ctx *lttng_static_ctx;
664
665 int lttng_context_init(void);
666 void lttng_context_exit(void);
667 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
668 void lttng_context_update(struct lttng_ctx *ctx);
669 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
670 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
671 void lttng_remove_context_field(struct lttng_ctx **ctx,
672 struct lttng_ctx_field *field);
673 void lttng_destroy_context(struct lttng_ctx *ctx);
674 int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
675 int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx);
676 int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
677 int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
678 int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
679 int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
680 int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
681 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
682 int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
683 int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
684 int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx);
685 int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx);
686 int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx);
687 #if defined(CONFIG_PREEMPT_RT_FULL) || defined(CONFIG_PREEMPT)
688 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx);
689 #else
690 static inline
691 int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
692 {
693 return -ENOSYS;
694 }
695 #endif
696 #ifdef CONFIG_PREEMPT_RT_FULL
697 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx);
698 #else
699 static inline
700 int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
701 {
702 return -ENOSYS;
703 }
704 #endif
705 #if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
706 int lttng_add_perf_counter_to_ctx(uint32_t type,
707 uint64_t config,
708 const char *name,
709 struct lttng_ctx **ctx);
710 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
711 struct lttng_cpuhp_node *node);
712 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
713 struct lttng_cpuhp_node *node);
714 #else
715 static inline
716 int lttng_add_perf_counter_to_ctx(uint32_t type,
717 uint64_t config,
718 const char *name,
719 struct lttng_ctx **ctx)
720 {
721 return -ENOSYS;
722 }
723 static inline
724 int lttng_cpuhp_perf_counter_online(unsigned int cpu,
725 struct lttng_cpuhp_node *node)
726 {
727 return 0;
728 }
729 static inline
730 int lttng_cpuhp_perf_counter_dead(unsigned int cpu,
731 struct lttng_cpuhp_node *node)
732 {
733 return 0;
734 }
735 #endif
736
737 int lttng_logger_init(void);
738 void lttng_logger_exit(void);
739
740 extern int lttng_statedump_start(struct lttng_session *session);
741
742 #ifdef CONFIG_KPROBES
743 int lttng_kprobes_register(const char *name,
744 const char *symbol_name,
745 uint64_t offset,
746 uint64_t addr,
747 struct lttng_event *event);
748 void lttng_kprobes_unregister(struct lttng_event *event);
749 void lttng_kprobes_destroy_private(struct lttng_event *event);
750 #else
751 static inline
752 int lttng_kprobes_register(const char *name,
753 const char *symbol_name,
754 uint64_t offset,
755 uint64_t addr,
756 struct lttng_event *event)
757 {
758 return -ENOSYS;
759 }
760
761 static inline
762 void lttng_kprobes_unregister(struct lttng_event *event)
763 {
764 }
765
766 static inline
767 void lttng_kprobes_destroy_private(struct lttng_event *event)
768 {
769 }
770 #endif
771
772 #ifdef CONFIG_KRETPROBES
773 int lttng_kretprobes_register(const char *name,
774 const char *symbol_name,
775 uint64_t offset,
776 uint64_t addr,
777 struct lttng_event *event_entry,
778 struct lttng_event *event_exit);
779 void lttng_kretprobes_unregister(struct lttng_event *event);
780 void lttng_kretprobes_destroy_private(struct lttng_event *event);
781 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
782 int enable);
783 #else
784 static inline
785 int lttng_kretprobes_register(const char *name,
786 const char *symbol_name,
787 uint64_t offset,
788 uint64_t addr,
789 struct lttng_event *event_entry,
790 struct lttng_event *event_exit)
791 {
792 return -ENOSYS;
793 }
794
795 static inline
796 void lttng_kretprobes_unregister(struct lttng_event *event)
797 {
798 }
799
800 static inline
801 void lttng_kretprobes_destroy_private(struct lttng_event *event)
802 {
803 }
804
805 static inline
806 int lttng_kretprobes_event_enable_state(struct lttng_event *event,
807 int enable)
808 {
809 return -ENOSYS;
810 }
811 #endif
812
813 #if defined(CONFIG_DYNAMIC_FTRACE) && !defined(LTTNG_FTRACE_MISSING_HEADER)
814 int lttng_ftrace_register(const char *name,
815 const char *symbol_name,
816 struct lttng_event *event);
817 void lttng_ftrace_unregister(struct lttng_event *event);
818 void lttng_ftrace_destroy_private(struct lttng_event *event);
819 #else
820 static inline
821 int lttng_ftrace_register(const char *name,
822 const char *symbol_name,
823 struct lttng_event *event)
824 {
825 return -ENOSYS;
826 }
827
828 static inline
829 void lttng_ftrace_unregister(struct lttng_event *event)
830 {
831 }
832
833 static inline
834 void lttng_ftrace_destroy_private(struct lttng_event *event)
835 {
836 }
837 #endif
838
839 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
840
841 extern const struct file_operations lttng_tracepoint_list_fops;
842 extern const struct file_operations lttng_syscall_list_fops;
843
844 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
845 #define TRACEPOINT_HAS_DATA_ARG
846 #endif
847
848 #endif /* _LTTNG_EVENTS_H */
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