sessiond: Implement UST event notifier error counter
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
54012638 1/*
ab5be9fa 2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
54012638 3 *
ab5be9fa 4 * SPDX-License-Identifier: GPL-2.0-only
54012638 5 *
54012638
DG
6 */
7
6c1c0768 8#define _LGPL_SOURCE
54012638
DG
9#include <stdio.h>
10#include <stdlib.h>
11#include <string.h>
c363b55d 12#include <unistd.h>
54012638 13
dcabc190
FD
14#include <lttng/event.h>
15#include <lttng/lttng-error.h>
352b58f5 16#include <lttng/kernel-probe.h>
dcabc190
FD
17#include <lttng/userspace-probe.h>
18#include <lttng/userspace-probe-internal.h>
352b58f5
JR
19#include <lttng/event-rule/event-rule.h>
20#include <lttng/event-rule/event-rule-internal.h>
a3c51653
JR
21#include <lttng/event-rule/kernel-probe.h>
22#include <lttng/event-rule/kernel-probe-internal.h>
352b58f5
JR
23#include <lttng/event-rule/syscall.h>
24#include <lttng/event-rule/syscall-internal.h>
25#include <lttng/event-rule/tracepoint.h>
26#include <lttng/event-rule/tracepoint-internal.h>
e957bf98 27#include <lttng/event-rule/userspace-probe-internal.h>
990570ed
DG
28#include <common/common.h>
29#include <common/defaults.h>
82b69413 30#include <common/trace-chunk.h>
d42266a4 31#include <common/macros.h>
1e307fab 32
00e2e675 33#include "consumer.h"
62499ad6 34#include "trace-kernel.h"
e9404c27
JG
35#include "lttng-sessiond.h"
36#include "notification-thread-commands.h"
54012638 37
19e70852 38/*
050349bb 39 * Find the channel name for the given kernel session.
19e70852 40 */
62499ad6 41struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
df4f5a87 42 const char *name, struct ltt_kernel_session *session)
19e70852
DG
43{
44 struct ltt_kernel_channel *chan;
45
0525e9ae
DG
46 assert(session);
47 assert(name);
19e70852 48
85076754
MD
49 /*
50 * If we receive an empty string for channel name, it means the
51 * default channel name is requested.
52 */
53 if (name[0] == '\0')
54 name = DEFAULT_CHANNEL_NAME;
55
54d01ffb
DG
56 DBG("Trying to find channel %s", name);
57
19e70852
DG
58 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
59 if (strcmp(name, chan->channel->name) == 0) {
60 DBG("Found channel by name %s", name);
61 return chan;
62 }
63 }
64
19e70852
DG
65 return NULL;
66}
67
00a62084
MD
68/*
69 * Find the event for the given channel.
70 */
71struct ltt_kernel_event *trace_kernel_find_event(
72 char *name, struct ltt_kernel_channel *channel,
73 enum lttng_event_type type,
2b00d462 74 struct lttng_bytecode *filter)
00a62084
MD
75{
76 struct ltt_kernel_event *ev;
77 int found = 0;
78
79 assert(name);
80 assert(channel);
81
82 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
83 if (type != LTTNG_EVENT_ALL && ev->type != type) {
84 continue;
85 }
86 if (strcmp(name, ev->event->name)) {
87 continue;
88 }
89 if ((ev->filter && !filter) || (!ev->filter && filter)) {
90 continue;
91 }
92 if (ev->filter && filter) {
93 if (ev->filter->len != filter->len ||
94 memcmp(ev->filter->data, filter->data,
95 filter->len) != 0) {
96 continue;
97 }
98 }
99 found = 1;
100 break;
101 }
102 if (found) {
103 DBG("Found event %s for channel %s", name,
104 channel->channel->name);
105 return ev;
106 } else {
107 return NULL;
108 }
109}
110
19e70852 111/*
050349bb 112 * Find the event name for the given channel.
19e70852 113 */
62499ad6 114struct ltt_kernel_event *trace_kernel_get_event_by_name(
d0ae4ea8
MD
115 char *name, struct ltt_kernel_channel *channel,
116 enum lttng_event_type type)
19e70852
DG
117{
118 struct ltt_kernel_event *ev;
00a62084 119 int found = 0;
19e70852 120
0525e9ae
DG
121 assert(name);
122 assert(channel);
19e70852
DG
123
124 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
00a62084 125 if (type != LTTNG_EVENT_ALL && ev->type != type) {
d0ae4ea8 126 continue;
19e70852 127 }
00a62084
MD
128 if (strcmp(name, ev->event->name)) {
129 continue;
130 }
131 found = 1;
132 break;
133 }
134 if (found) {
135 DBG("Found event %s for channel %s", name,
136 channel->channel->name);
137 return ev;
138 } else {
139 return NULL;
19e70852 140 }
19e70852
DG
141}
142
54012638 143/*
050349bb 144 * Allocate and initialize a kernel session data structure.
54012638 145 *
050349bb 146 * Return pointer to structure or NULL.
54012638 147 */
dec56f6c 148struct ltt_kernel_session *trace_kernel_create_session(void)
54012638 149{
a4b92340 150 struct ltt_kernel_session *lks = NULL;
54012638
DG
151
152 /* Allocate a new ltt kernel session */
ba7f0ae5 153 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 154 if (lks == NULL) {
df0f840b 155 PERROR("create kernel session zmalloc");
a4b92340 156 goto alloc_error;
54012638
DG
157 }
158
159 /* Init data structure */
03550b58
MD
160 lks->fd = -1;
161 lks->metadata_stream_fd = -1;
54012638
DG
162 lks->channel_count = 0;
163 lks->stream_count_global = 0;
164 lks->metadata = NULL;
165 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
166
159b042f
JG
167 lks->tracker_pid = process_attr_tracker_create();
168 if (!lks->tracker_pid) {
55c9e7ca
JR
169 goto error;
170 }
159b042f
JG
171 lks->tracker_vpid = process_attr_tracker_create();
172 if (!lks->tracker_vpid) {
55c9e7ca
JR
173 goto error;
174 }
159b042f
JG
175 lks->tracker_uid = process_attr_tracker_create();
176 if (!lks->tracker_uid) {
55c9e7ca
JR
177 goto error;
178 }
159b042f
JG
179 lks->tracker_vuid = process_attr_tracker_create();
180 if (!lks->tracker_vuid) {
55c9e7ca
JR
181 goto error;
182 }
159b042f
JG
183 lks->tracker_gid = process_attr_tracker_create();
184 if (!lks->tracker_gid) {
55c9e7ca
JR
185 goto error;
186 }
159b042f
JG
187 lks->tracker_vgid = process_attr_tracker_create();
188 if (!lks->tracker_vgid) {
55c9e7ca
JR
189 goto error;
190 }
00e2e675
DG
191 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
192 if (lks->consumer == NULL) {
193 goto error;
194 }
195
54012638
DG
196 return lks;
197
198error:
159b042f
JG
199 process_attr_tracker_destroy(lks->tracker_pid);
200 process_attr_tracker_destroy(lks->tracker_vpid);
201 process_attr_tracker_destroy(lks->tracker_uid);
202 process_attr_tracker_destroy(lks->tracker_vuid);
203 process_attr_tracker_destroy(lks->tracker_gid);
204 process_attr_tracker_destroy(lks->tracker_vgid);
a4b92340
DG
205 free(lks);
206
207alloc_error:
54012638
DG
208 return NULL;
209}
210
211/*
050349bb 212 * Allocate and initialize a kernel channel data structure.
54012638 213 *
050349bb 214 * Return pointer to structure or NULL.
54012638 215 */
00e2e675 216struct ltt_kernel_channel *trace_kernel_create_channel(
fdd9eb17 217 struct lttng_channel *chan)
54012638 218{
54012638 219 struct ltt_kernel_channel *lkc;
61a5b6b1 220 struct lttng_channel_extended *extended = NULL;
54012638 221
0525e9ae
DG
222 assert(chan);
223
ba7f0ae5 224 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 225 if (lkc == NULL) {
df0f840b 226 PERROR("ltt_kernel_channel zmalloc");
54012638
DG
227 goto error;
228 }
229
ba7f0ae5 230 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 231 if (lkc->channel == NULL) {
df0f840b 232 PERROR("lttng_channel zmalloc");
e9404c27
JG
233 goto error;
234 }
235
236 extended = zmalloc(sizeof(struct lttng_channel_extended));
237 if (!extended) {
238 PERROR("lttng_channel_channel zmalloc");
f3ed775e
DG
239 goto error;
240 }
241 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
e9404c27
JG
242 memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
243 lkc->channel->attr.extended.ptr = extended;
244 extended = NULL;
54012638 245
85076754
MD
246 /*
247 * If we receive an empty string for channel name, it means the
248 * default channel name is requested.
249 */
250 if (chan->name[0] == '\0') {
251 strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
252 sizeof(lkc->channel->name));
253 }
bd722d76 254 lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
85076754 255
03550b58 256 lkc->fd = -1;
54012638 257 lkc->stream_count = 0;
cbbbb275 258 lkc->event_count = 0;
d36b8583 259 lkc->enabled = 1;
753873bf 260 lkc->published_to_notification_thread = false;
54012638
DG
261 /* Init linked list */
262 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
263 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
645328ae 264 CDS_INIT_LIST_HEAD(&lkc->ctx_list);
54012638
DG
265
266 return lkc;
267
268error:
e9404c27
JG
269 if (lkc) {
270 free(lkc->channel);
271 }
272 free(extended);
273 free(lkc);
54012638
DG
274 return NULL;
275}
276
645328ae
DG
277/*
278 * Allocate and init a kernel context object.
279 *
280 * Return the allocated object or NULL on error.
281 */
282struct ltt_kernel_context *trace_kernel_create_context(
283 struct lttng_kernel_context *ctx)
284{
285 struct ltt_kernel_context *kctx;
286
287 kctx = zmalloc(sizeof(*kctx));
288 if (!kctx) {
289 PERROR("zmalloc kernel context");
290 goto error;
291 }
292
293 if (ctx) {
294 memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
295 }
df3c77c8
JG
296error:
297 return kctx;
298}
645328ae 299
df3c77c8
JG
300/*
301 * Allocate and init a kernel context object from an existing kernel context
302 * object.
303 *
304 * Return the allocated object or NULL on error.
305 */
306struct ltt_kernel_context *trace_kernel_copy_context(
307 struct ltt_kernel_context *kctx)
308{
309 struct ltt_kernel_context *kctx_copy;
310
311 assert(kctx);
312 kctx_copy = zmalloc(sizeof(*kctx_copy));
313 if (!kctx_copy) {
314 PERROR("zmalloc ltt_kernel_context");
315 goto error;
316 }
317
318 memcpy(kctx_copy, kctx, sizeof(*kctx_copy));
319 memset(&kctx_copy->list, 0, sizeof(kctx_copy->list));
7b9445b3 320
645328ae 321error:
df3c77c8 322 return kctx_copy;
645328ae
DG
323}
324
54012638 325/*
050349bb 326 * Allocate and initialize a kernel event. Set name and event type.
a969e101 327 * We own filter_expression, and filter.
54012638 328 *
050349bb 329 * Return pointer to structure or NULL.
54012638 330 */
71a3bb01
FD
331enum lttng_error_code trace_kernel_create_event(
332 struct lttng_event *ev, char *filter_expression,
2b00d462 333 struct lttng_bytecode *filter,
71a3bb01 334 struct ltt_kernel_event **kernel_event)
54012638 335{
71a3bb01 336 enum lttng_error_code ret;
54012638 337 struct lttng_kernel_event *attr;
71a3bb01 338 struct ltt_kernel_event *local_kernel_event;
dcabc190 339 struct lttng_userspace_probe_location *userspace_probe_location = NULL;
54012638 340
0525e9ae
DG
341 assert(ev);
342
71a3bb01 343 local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event));
ba7f0ae5 344 attr = zmalloc(sizeof(struct lttng_kernel_event));
71a3bb01 345 if (local_kernel_event == NULL || attr == NULL) {
df0f840b 346 PERROR("kernel event zmalloc");
71a3bb01 347 ret = LTTNG_ERR_NOMEM;
54012638
DG
348 goto error;
349 }
350
f3ed775e 351 switch (ev->type) {
7d29a247 352 case LTTNG_EVENT_PROBE:
e6ddca71 353 attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247
DG
354 attr->u.kprobe.addr = ev->attr.probe.addr;
355 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 356 strncpy(attr->u.kprobe.symbol_name,
dbbb3ec5
DG
357 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
358 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 359 break;
dcabc190
FD
360 case LTTNG_EVENT_USERSPACE_PROBE:
361 {
87597c2c
JG
362 const struct lttng_userspace_probe_location* location = NULL;
363 const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
dcabc190
FD
364
365 location = lttng_event_get_userspace_probe_location(ev);
366 if (!location) {
367 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
368 goto error;
369 }
370
371 /*
372 * From this point on, the specific term 'uprobe' is used
373 * instead of the generic 'userspace probe' because it's the
374 * technology used at the moment for this instrumentation.
375 * LTTng currently implements userspace probes using uprobes.
376 * In the interactions with the kernel tracer, we use the
377 * uprobe term.
378 */
379 attr->instrumentation = LTTNG_KERNEL_UPROBE;
380
dcabc190
FD
381 lookup = lttng_userspace_probe_location_get_lookup_method(
382 location);
383 if (!lookup) {
384 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
385 goto error;
386 }
387
388 /*
389 * From the kernel tracer's perspective, all userspace probe
390 * event types are all the same: a file and an offset.
391 */
392 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
393 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
394 /* Get the file descriptor on the target binary. */
395 attr->u.uprobe.fd =
396 lttng_userspace_probe_location_function_get_binary_fd(location);
397
398 /*
399 * Save a reference to the probe location used during
e368fb43 400 * the listing of events.
dcabc190
FD
401 */
402 userspace_probe_location =
403 lttng_userspace_probe_location_copy(location);
dcabc190
FD
404 break;
405 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
406 /* Get the file descriptor on the target binary. */
407 attr->u.uprobe.fd =
408 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
409
410 /*
411 * Save a reference to the probe location used during the listing of
e368fb43 412 * events.
dcabc190
FD
413 */
414 userspace_probe_location =
415 lttng_userspace_probe_location_copy(location);
dcabc190
FD
416 break;
417 default:
418 DBG("Unsupported lookup method type");
419 ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
420 goto error;
421 }
422 break;
423 }
f3ed775e 424 case LTTNG_EVENT_FUNCTION:
8f0d098b
MD
425 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
426 attr->u.kretprobe.addr = ev->attr.probe.addr;
427 attr->u.kretprobe.offset = ev->attr.probe.offset;
8f0d098b 428 strncpy(attr->u.kretprobe.symbol_name,
dbbb3ec5
DG
429 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
430 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
8f0d098b
MD
431 break;
432 case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e
DG
433 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
434 strncpy(attr->u.ftrace.symbol_name,
dbbb3ec5
DG
435 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
436 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 437 break;
e6ddca71
DG
438 case LTTNG_EVENT_TRACEPOINT:
439 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 440 break;
a54bd42d
MD
441 case LTTNG_EVENT_SYSCALL:
442 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
c863e5a6
FD
443 attr->u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_ALL;
444 attr->u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRYEXIT;
445 attr->u.syscall.match = LTTNG_KERNEL_SYSCALL_MATCH_NAME;
0133c199 446 break;
7a3d1328
MD
447 case LTTNG_EVENT_ALL:
448 attr->instrumentation = LTTNG_KERNEL_ALL;
449 break;
f3ed775e
DG
450 default:
451 ERR("Unknown kernel instrumentation type (%d)", ev->type);
71a3bb01 452 ret = LTTNG_ERR_INVALID;
f3ed775e
DG
453 goto error;
454 }
455
456 /* Copy event name */
dbbb3ec5
DG
457 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
458 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 459
54012638 460 /* Setting up a kernel event */
71a3bb01
FD
461 local_kernel_event->fd = -1;
462 local_kernel_event->event = attr;
463 local_kernel_event->enabled = 1;
464 local_kernel_event->filter_expression = filter_expression;
465 local_kernel_event->filter = filter;
dcabc190 466 local_kernel_event->userspace_probe_location = userspace_probe_location;
54012638 467
71a3bb01
FD
468 *kernel_event = local_kernel_event;
469
470 return LTTNG_OK;
54012638
DG
471
472error:
a969e101
MD
473 free(filter_expression);
474 free(filter);
71a3bb01 475 free(local_kernel_event);
a2c0da86 476 free(attr);
71a3bb01 477 return ret;
54012638
DG
478}
479
352b58f5
JR
480/*
481 * Allocate and initialize a kernel token event rule.
482 *
483 * Return pointer to structure or NULL.
484 */
485enum lttng_error_code trace_kernel_create_event_notifier_rule(
486 struct lttng_trigger *trigger,
487 uint64_t token,
90aa04a1 488 uint64_t error_counter_index,
352b58f5
JR
489 struct ltt_kernel_event_notifier_rule **event_notifier_rule)
490{
491 enum lttng_error_code ret = LTTNG_OK;
492 enum lttng_condition_type condition_type;
493 enum lttng_event_rule_type event_rule_type;
494 enum lttng_condition_status condition_status;
495 struct ltt_kernel_event_notifier_rule *local_kernel_token_event_rule;
496 const struct lttng_condition *condition = NULL;
497 const struct lttng_event_rule *event_rule = NULL;
498
499 assert(event_notifier_rule);
500
7c1f6da2 501 condition = lttng_trigger_get_const_condition(trigger);
352b58f5
JR
502 assert(condition);
503
504 condition_type = lttng_condition_get_type(condition);
d602bd6a 505 assert(condition_type == LTTNG_CONDITION_TYPE_ON_EVENT);
352b58f5 506
d602bd6a 507 condition_status = lttng_condition_on_event_get_rule(
352b58f5
JR
508 condition, &event_rule);
509 assert(condition_status == LTTNG_CONDITION_STATUS_OK);
510 assert(event_rule);
511
512 event_rule_type = lttng_event_rule_get_type(event_rule);
513 assert(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN);
514
515 local_kernel_token_event_rule =
516 zmalloc(sizeof(struct ltt_kernel_event_notifier_rule));
517 if (local_kernel_token_event_rule == NULL) {
518 PERROR("Failed to allocate ltt_kernel_token_event_rule structure");
519 ret = LTTNG_ERR_NOMEM;
520 goto error;
521 }
522
523 local_kernel_token_event_rule->fd = -1;
524 local_kernel_token_event_rule->enabled = 1;
525 local_kernel_token_event_rule->token = token;
90aa04a1 526 local_kernel_token_event_rule->error_counter_index = error_counter_index;
352b58f5
JR
527
528 /* Get the reference of the event rule. */
529 lttng_trigger_get(trigger);
530
531 local_kernel_token_event_rule->trigger = trigger;
532 /* The event rule still owns the filter and bytecode. */
533 local_kernel_token_event_rule->filter =
534 lttng_event_rule_get_filter_bytecode(event_rule);
535
536 DBG3("Created kernel event notifier rule: token = %" PRIu64,
537 local_kernel_token_event_rule->token);
538error:
539 *event_notifier_rule = local_kernel_token_event_rule;
540 return ret;
541}
542
543/*
544 * Initialize a kernel trigger from an event rule.
545 */
546enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
547 const struct lttng_event_rule *rule,
548 struct lttng_kernel_event_notifier *kernel_event_notifier)
549{
366a83b3 550 enum lttng_error_code ret_code;
352b58f5 551 const char *name;
366a83b3 552 int strncpy_ret;
352b58f5
JR
553
554 switch (lttng_event_rule_get_type(rule)) {
f2791161 555 case LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE:
352b58f5
JR
556 {
557 uint64_t address = 0, offset = 0;
558 const char *symbol_name = NULL;
559 const struct lttng_kernel_probe_location *location = NULL;
560 enum lttng_kernel_probe_location_status k_status;
561 enum lttng_event_rule_status status;
562
f2791161 563 status = lttng_event_rule_kernel_probe_get_location(rule, &location);
352b58f5 564 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
366a83b3 565 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
352b58f5
JR
566 goto error;
567 }
568
569 switch (lttng_kernel_probe_location_get_type(location)) {
570 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS:
571 {
572 k_status = lttng_kernel_probe_location_address_get_address(
573 location, &address);
574 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
575 break;
576 }
577 case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET:
578 {
579 k_status = lttng_kernel_probe_location_symbol_get_offset(
580 location, &offset);
581 assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
582 symbol_name = lttng_kernel_probe_location_symbol_get_name(
583 location);
584 break;
585 }
586 default:
587 abort();
588 }
589
590 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_KPROBE;
591 kernel_event_notifier->event.u.kprobe.addr = address;
592 kernel_event_notifier->event.u.kprobe.offset = offset;
593 if (symbol_name) {
366a83b3 594 strncpy_ret = lttng_strncpy(
352b58f5
JR
595 kernel_event_notifier->event.u.kprobe.symbol_name,
596 symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
597
366a83b3
JG
598 if (strncpy_ret) {
599 ret_code = LTTNG_ERR_INVALID;
352b58f5
JR
600 goto error;
601 }
602 }
603
604 kernel_event_notifier->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f2791161 605
d891bb52 606 status = lttng_event_rule_kernel_probe_get_event_name(rule, &name);
352b58f5 607 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
366a83b3 608 ret_code = LTTNG_OK;
352b58f5
JR
609 break;
610 }
1f1567a5 611 case LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE:
352b58f5
JR
612 {
613 const struct lttng_userspace_probe_location* location = NULL;
614 const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
615 enum lttng_event_rule_status status;
616
1f1567a5 617 status = lttng_event_rule_userspace_probe_get_location(rule, &location);
352b58f5 618 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
366a83b3 619 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
352b58f5
JR
620 goto error;
621 }
622
623 kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_UPROBE;
624
625 lookup = lttng_userspace_probe_location_get_lookup_method(
626 location);
627 if (!lookup) {
366a83b3 628 ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
352b58f5
JR
629 goto error;
630 }
631
632 /*
633 * From the kernel tracer's perspective, all userspace probe
634 * event types are all the same: a file and an offset.
635 */
636 switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
637 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
638 /* Get the file descriptor on the target binary. */
639 kernel_event_notifier->event.u.uprobe.fd =
640 lttng_userspace_probe_location_function_get_binary_fd(location);
641
642 break;
643 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
644 /* Get the file descriptor on the target binary. */
645 kernel_event_notifier->event.u.uprobe.fd =
646 lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
647 break;
648 default:
649 abort();
650 }
651
405f9e7d
JR
652 status = lttng_event_rule_userspace_probe_get_event_name(
653 rule, &name);
352b58f5 654 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
366a83b3 655 ret_code = LTTNG_OK;
352b58f5
JR
656 break;
657 }
658 case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
659 {
660 const enum lttng_domain_type domain =
661 lttng_event_rule_get_domain_type(rule);
662 const enum lttng_event_rule_status status =
663 lttng_event_rule_tracepoint_get_pattern(
664 rule, &name);
665
666 assert(domain == LTTNG_DOMAIN_KERNEL);
667 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
668 kernel_event_notifier->event.instrumentation =
669 LTTNG_KERNEL_TRACEPOINT;
670
366a83b3 671 ret_code = LTTNG_OK;
352b58f5
JR
672 break;
673 }
674 case LTTNG_EVENT_RULE_TYPE_SYSCALL:
675 {
676 const enum lttng_event_rule_status status =
677 lttng_event_rule_syscall_get_pattern(
678 rule, &name);
679
680 assert(status == LTTNG_EVENT_RULE_STATUS_OK);
681
682 kernel_event_notifier->event.instrumentation =
683 LTTNG_KERNEL_SYSCALL;
684 kernel_event_notifier->event.u.syscall.abi =
685 LTTNG_KERNEL_SYSCALL_ABI_ALL;
686 kernel_event_notifier->event.u.syscall.entryexit =
687 LTTNG_KERNEL_SYSCALL_ENTRY;
688 kernel_event_notifier->event.u.syscall.match =
689 LTTNG_KERNEL_SYSCALL_MATCH_NAME;
366a83b3 690 ret_code = LTTNG_OK;
352b58f5
JR
691 break;
692 }
f2d09181 693 case LTTNG_EVENT_RULE_TYPE_KERNEL_FUNCTION:
352b58f5
JR
694 default:
695 abort();
696 break;
697 }
698
366a83b3 699 strncpy_ret = lttng_strncpy(kernel_event_notifier->event.name, name,
352b58f5 700 LTTNG_KERNEL_SYM_NAME_LEN);
366a83b3
JG
701 if (strncpy_ret) {
702 ret_code = LTTNG_ERR_INVALID;
352b58f5
JR
703 goto error;
704 }
705
706error:
366a83b3 707 return ret_code;
352b58f5 708}
54012638 709/*
050349bb 710 * Allocate and initialize a kernel metadata.
54012638 711 *
050349bb 712 * Return pointer to structure or NULL.
54012638 713 */
a4b92340 714struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 715{
d42266a4 716 int ret;
54012638 717 struct ltt_kernel_metadata *lkm;
f3ed775e 718 struct lttng_channel *chan;
54012638 719
ba7f0ae5
DG
720 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
721 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 722 if (lkm == NULL || chan == NULL) {
df0f840b 723 PERROR("kernel metadata zmalloc");
54012638
DG
724 goto error;
725 }
726
d42266a4
JG
727 ret = lttng_strncpy(
728 chan->name, DEFAULT_METADATA_NAME, sizeof(chan->name));
729 if (ret) {
730 ERR("Failed to initialize metadata channel name to `%s`",
731 DEFAULT_METADATA_NAME);
732 goto error;
733 }
734
54012638 735 /* Set default attributes */
d42266a4 736 chan->attr.overwrite = DEFAULT_METADATA_OVERWRITE;
3e230f92 737 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
b389abbe 738 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
d42266a4
JG
739 chan->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
740 chan->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;;
741
742
743 /*
744 * The metadata channel of kernel sessions must use the "mmap"
745 * back-end since the consumer daemon accumulates complete
746 * metadata units before sending them to the relay daemon in
747 * live mode. The consumer daemon also needs to extract the contents
748 * of the metadata cache when computing a rotation position.
749 *
750 * In both cases, it is not possible to rely on the splice
751 * back-end as the consumer daemon may need to accumulate more
752 * content than can be backed by the ring buffer's underlying
753 * pages.
754 */
755 chan->attr.output = LTTNG_EVENT_MMAP;
756 chan->attr.tracefile_size = 0;
757 chan->attr.tracefile_count = 0;
758 chan->attr.live_timer_interval = 0;
54012638
DG
759
760 /* Init metadata */
03550b58 761 lkm->fd = -1;
f3ed775e 762 lkm->conf = chan;
54012638
DG
763
764 return lkm;
765
766error:
a2c0da86
MD
767 free(lkm);
768 free(chan);
54012638
DG
769 return NULL;
770}
771
772/*
050349bb
DG
773 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
774 * default.
54012638 775 *
050349bb 776 * Return pointer to structure or NULL.
54012638 777 */
00e2e675
DG
778struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
779 unsigned int count)
54012638 780{
00e2e675 781 int ret;
54012638
DG
782 struct ltt_kernel_stream *lks;
783
0525e9ae
DG
784 assert(name);
785
ba7f0ae5 786 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 787 if (lks == NULL) {
df0f840b 788 PERROR("kernel stream zmalloc");
54012638
DG
789 goto error;
790 }
791
00e2e675 792 /* Set name */
535b8ff4 793 ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
00e2e675
DG
794 if (ret < 0) {
795 PERROR("snprintf stream name");
796 goto error;
797 }
798 lks->name[sizeof(lks->name) - 1] = '\0';
799
54012638 800 /* Init stream */
03550b58 801 lks->fd = -1;
54012638 802 lks->state = 0;
ffe60014 803 lks->cpu = count;
54012638
DG
804
805 return lks;
806
807error:
808 return NULL;
809}
c363b55d 810
050349bb
DG
811/*
812 * Cleanup kernel stream structure.
813 */
62499ad6 814void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 815{
0525e9ae
DG
816 assert(stream);
817
33a2b854 818 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 819 /* Close kernel fd */
03550b58 820 if (stream->fd >= 0) {
c617c0c6
MD
821 int ret;
822
03550b58
MD
823 ret = close(stream->fd);
824 if (ret) {
825 PERROR("close");
826 }
799e2c4f 827 }
c363b55d
DG
828 /* Remove from stream list */
829 cds_list_del(&stream->list);
f9815039 830
c363b55d
DG
831 free(stream);
832}
833
050349bb
DG
834/*
835 * Cleanup kernel event structure.
836 */
62499ad6 837void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 838{
0525e9ae
DG
839 assert(event);
840
87eb4ab8 841 if (event->fd >= 0) {
c617c0c6
MD
842 int ret;
843
87eb4ab8
MD
844 DBG("[trace] Closing event fd %d", event->fd);
845 /* Close kernel fd */
799e2c4f
MD
846 ret = close(event->fd);
847 if (ret) {
848 PERROR("close");
849 }
87eb4ab8 850 } else {
352b58f5 851 DBG("[trace] Tearing down event (no associated file descriptor)");
87eb4ab8 852 }
c363b55d
DG
853
854 /* Remove from event list */
855 cds_list_del(&event->list);
f9815039 856
00a62084
MD
857 free(event->filter_expression);
858 free(event->filter);
859
f9815039 860 free(event->event);
c363b55d
DG
861 free(event);
862}
863
352b58f5
JR
864/*
865 * Cleanup kernel event structure.
866 */
867static void free_token_event_rule_rcu(struct rcu_head *rcu_node)
868{
869 struct ltt_kernel_event_notifier_rule *rule = caa_container_of(rcu_node,
870 struct ltt_kernel_event_notifier_rule, rcu_node);
871
872 free(rule);
873}
874
875void trace_kernel_destroy_event_notifier_rule(
876 struct ltt_kernel_event_notifier_rule *event)
877{
878 assert(event);
879
880 if (event->fd >= 0) {
881 const int ret = close(event->fd);
882
883 DBG("Closing kernel event notifier rule file descriptor: fd = %d",
884 event->fd);
885 if (ret) {
886 PERROR("Failed to close kernel event notifier file descriptor: fd = %d",
887 event->fd);
888 }
889 } else {
890 DBG("Destroying kernel event notifier rule (no associated file descriptor)");
891 }
892
893 lttng_trigger_put(event->trigger);
894 call_rcu(&event->rcu_node, free_token_event_rule_rcu);
895}
645328ae
DG
896/*
897 * Cleanup kernel context structure.
898 */
899void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
900{
901 assert(ctx);
902
ba985c3a
JG
903 if (ctx->in_list) {
904 cds_list_del(&ctx->list);
905 }
645328ae
DG
906 free(ctx);
907}
908
050349bb
DG
909/*
910 * Cleanup kernel channel structure.
911 */
62499ad6 912void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 913{
af9737e9
DG
914 struct ltt_kernel_stream *stream, *stmp;
915 struct ltt_kernel_event *event, *etmp;
645328ae 916 struct ltt_kernel_context *ctx, *ctmp;
799e2c4f 917 int ret;
e9404c27 918 enum lttng_error_code status;
c363b55d 919
0525e9ae
DG
920 assert(channel);
921
33a2b854 922 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 923 /* Close kernel fd */
03550b58
MD
924 if (channel->fd >= 0) {
925 ret = close(channel->fd);
926 if (ret) {
927 PERROR("close");
928 }
799e2c4f 929 }
c363b55d
DG
930
931 /* For each stream in the channel list */
af9737e9 932 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 933 trace_kernel_destroy_stream(stream);
c363b55d
DG
934 }
935
936 /* For each event in the channel list */
af9737e9 937 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 938 trace_kernel_destroy_event(event);
c363b55d
DG
939 }
940
645328ae
DG
941 /* For each context in the channel list */
942 cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
943 trace_kernel_destroy_context(ctx);
944 }
945
c363b55d
DG
946 /* Remove from channel list */
947 cds_list_del(&channel->list);
f9815039 948
753873bf
JR
949 if (notification_thread_handle
950 && channel->published_to_notification_thread) {
63aaa3dc
JG
951 status = notification_thread_command_remove_channel(
952 notification_thread_handle,
e1f3997a 953 channel->key, LTTNG_DOMAIN_KERNEL);
63aaa3dc
JG
954 assert(status == LTTNG_OK);
955 }
e9404c27 956 free(channel->channel->attr.extended.ptr);
f9815039 957 free(channel->channel);
c363b55d
DG
958 free(channel);
959}
960
050349bb
DG
961/*
962 * Cleanup kernel metadata structure.
963 */
62499ad6 964void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 965{
0525e9ae
DG
966 assert(metadata);
967
33a2b854 968 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 969 /* Close kernel fd */
03550b58 970 if (metadata->fd >= 0) {
c617c0c6
MD
971 int ret;
972
03550b58
MD
973 ret = close(metadata->fd);
974 if (ret) {
975 PERROR("close");
976 }
799e2c4f 977 }
c363b55d 978
f9815039 979 free(metadata->conf);
c363b55d
DG
980 free(metadata);
981}
982
050349bb 983/*
62499ad6 984 * Cleanup kernel session structure
36b588ed
MD
985 *
986 * Should *NOT* be called with RCU read-side lock held.
050349bb 987 */
62499ad6 988void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 989{
af9737e9 990 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 991 int ret;
c363b55d 992
0525e9ae
DG
993 assert(session);
994
33a2b854 995 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 996 /* Close kernel fds */
03550b58
MD
997 if (session->fd >= 0) {
998 ret = close(session->fd);
999 if (ret) {
1000 PERROR("close");
1001 }
799e2c4f 1002 }
f9815039 1003
03550b58 1004 if (session->metadata_stream_fd >= 0) {
70dc1c34 1005 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
1006 ret = close(session->metadata_stream_fd);
1007 if (ret) {
1008 PERROR("close");
1009 }
70dc1c34 1010 }
c363b55d 1011
d36b8583 1012 if (session->metadata != NULL) {
62499ad6 1013 trace_kernel_destroy_metadata(session->metadata);
d36b8583 1014 }
c363b55d 1015
af9737e9 1016 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 1017 trace_kernel_destroy_channel(channel);
c363b55d 1018 }
d070c424 1019}
c363b55d 1020
d070c424
MD
1021/* Free elements needed by destroy notifiers. */
1022void trace_kernel_free_session(struct ltt_kernel_session *session)
1023{
00e2e675 1024 /* Wipe consumer output object */
6addfa37 1025 consumer_output_put(session->consumer);
00e2e675 1026
159b042f
JG
1027 process_attr_tracker_destroy(session->tracker_pid);
1028 process_attr_tracker_destroy(session->tracker_vpid);
1029 process_attr_tracker_destroy(session->tracker_uid);
1030 process_attr_tracker_destroy(session->tracker_vuid);
1031 process_attr_tracker_destroy(session->tracker_gid);
1032 process_attr_tracker_destroy(session->tracker_vgid);
55c9e7ca 1033
c363b55d
DG
1034 free(session);
1035}
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