Commit | Line | Data |
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97ee3a89 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; only version 2 of the License. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #include <lttngerr.h> | |
25 | #include <lttng-share.h> | |
26 | ||
f6a9efaa | 27 | #include "hashtable.h" |
97ee3a89 DG |
28 | #include "trace-ust.h" |
29 | ||
0177d773 | 30 | /* |
f6a9efaa | 31 | * Find the channel in the hashtable. |
0177d773 | 32 | */ |
f6a9efaa DG |
33 | struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht, |
34 | char *name) | |
0177d773 | 35 | { |
f6a9efaa DG |
36 | struct cds_lfht_node *node; |
37 | struct cds_lfht_iter iter; | |
0177d773 | 38 | |
f6a9efaa DG |
39 | rcu_read_lock(); |
40 | node = hashtable_lookup(ht, (void *) name, strlen(name), &iter); | |
41 | if (node == NULL) { | |
42 | rcu_read_unlock(); | |
44d3bd01 DG |
43 | goto error; |
44 | } | |
f6a9efaa | 45 | rcu_read_unlock(); |
44d3bd01 | 46 | |
f6a9efaa | 47 | DBG2("Trace UST channel %s found by name", name); |
0177d773 | 48 | |
f6a9efaa | 49 | return caa_container_of(node, struct ltt_ust_channel, node); |
97ee3a89 DG |
50 | |
51 | error: | |
f6a9efaa | 52 | DBG2("Trace UST channel %s not found by name", name); |
97ee3a89 DG |
53 | return NULL; |
54 | } | |
55 | ||
56 | /* | |
f6a9efaa | 57 | * Find the event in the hashtable. |
97ee3a89 | 58 | */ |
f6a9efaa DG |
59 | struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht, |
60 | char *name) | |
97ee3a89 | 61 | { |
f6a9efaa DG |
62 | struct cds_lfht_node *node; |
63 | struct cds_lfht_iter iter; | |
97ee3a89 | 64 | |
f6a9efaa DG |
65 | rcu_read_lock(); |
66 | node = hashtable_lookup(ht, (void *) name, strlen(name), &iter); | |
67 | if (node == NULL) { | |
68 | rcu_read_unlock(); | |
97ee3a89 DG |
69 | goto error; |
70 | } | |
f6a9efaa | 71 | rcu_read_unlock(); |
97ee3a89 | 72 | |
f6a9efaa DG |
73 | DBG2("Found UST event by name %s", name); |
74 | ||
75 | return caa_container_of(node, struct ltt_ust_event, node); | |
97ee3a89 DG |
76 | |
77 | error: | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Allocate and initialize a ust session data structure. | |
83 | * | |
84 | * Return pointer to structure or NULL. | |
85 | */ | |
48842b30 | 86 | struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid, |
44d3bd01 | 87 | struct lttng_domain *domain) |
97ee3a89 | 88 | { |
0177d773 | 89 | int ret; |
97ee3a89 DG |
90 | struct ltt_ust_session *lus; |
91 | ||
92 | /* Allocate a new ltt ust session */ | |
93 | lus = malloc(sizeof(struct ltt_ust_session)); | |
94 | if (lus == NULL) { | |
95 | perror("create ust session malloc"); | |
96 | goto error; | |
97 | } | |
98 | ||
99 | /* Init data structure */ | |
3bd1e081 | 100 | lus->consumer_fds_sent = 0; |
48842b30 | 101 | lus->uid = uid; |
97ee3a89 | 102 | |
f6a9efaa DG |
103 | /* Alloc UST domain hash tables */ |
104 | lus->domain_pid = hashtable_new(0); | |
105 | lus->domain_exec = hashtable_new_str(0); | |
106 | ||
107 | /* Alloc UST global domain channels' HT */ | |
108 | lus->domain_global.channels = hashtable_new_str(0); | |
44d3bd01 | 109 | |
0177d773 | 110 | /* Set session path */ |
48842b30 | 111 | ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path); |
0177d773 | 112 | if (ret < 0) { |
44d3bd01 | 113 | PERROR("snprintf kernel traces path"); |
0177d773 DG |
114 | goto error; |
115 | } | |
116 | ||
44d3bd01 DG |
117 | DBG2("UST trace session create successful"); |
118 | ||
97ee3a89 DG |
119 | return lus; |
120 | ||
121 | error: | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Allocate and initialize a ust channel data structure. | |
127 | * | |
128 | * Return pointer to structure or NULL. | |
129 | */ | |
44d3bd01 DG |
130 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan, |
131 | char *path) | |
97ee3a89 DG |
132 | { |
133 | int ret; | |
134 | struct ltt_ust_channel *luc; | |
135 | ||
136 | luc = malloc(sizeof(struct ltt_ust_channel)); | |
137 | if (luc == NULL) { | |
138 | perror("ltt_ust_channel malloc"); | |
139 | goto error; | |
140 | } | |
141 | ||
44d3bd01 | 142 | /* Copy UST channel attributes */ |
48842b30 DG |
143 | luc->attr.overwrite = chan->attr.overwrite; |
144 | luc->attr.subbuf_size = chan->attr.subbuf_size; | |
145 | luc->attr.num_subbuf = chan->attr.num_subbuf; | |
146 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; | |
147 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; | |
148 | luc->attr.output = chan->attr.output; | |
44d3bd01 DG |
149 | |
150 | /* Translate to UST output enum */ | |
151 | switch (luc->attr.output) { | |
152 | default: | |
153 | luc->attr.output = LTTNG_UST_MMAP; | |
154 | break; | |
97ee3a89 | 155 | } |
97ee3a89 | 156 | |
97ee3a89 | 157 | /* Copy channel name */ |
44d3bd01 | 158 | strncpy(luc->name, chan->name, sizeof(&luc->name)); |
97ee3a89 DG |
159 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
160 | ||
f6a9efaa DG |
161 | /* Init node */ |
162 | hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name)); | |
163 | /* Alloc hash tables */ | |
164 | luc->events = hashtable_new_str(0); | |
165 | luc->ctx = hashtable_new_str(0); | |
166 | ||
97ee3a89 | 167 | /* Set trace output path */ |
48842b30 | 168 | ret = snprintf(luc->pathname, PATH_MAX, "%s", path); |
97ee3a89 DG |
169 | if (ret < 0) { |
170 | perror("asprintf ust create channel"); | |
171 | goto error; | |
172 | } | |
173 | ||
f6a9efaa DG |
174 | DBG2("Trace UST channel %s created", luc->name); |
175 | ||
97ee3a89 DG |
176 | return luc; |
177 | ||
178 | error: | |
179 | return NULL; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Allocate and initialize a ust event. Set name and event type. | |
184 | * | |
185 | * Return pointer to structure or NULL. | |
186 | */ | |
187 | struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev) | |
188 | { | |
189 | struct ltt_ust_event *lue; | |
97ee3a89 DG |
190 | |
191 | lue = malloc(sizeof(struct ltt_ust_event)); | |
44d3bd01 DG |
192 | if (lue == NULL) { |
193 | PERROR("ust event malloc"); | |
97ee3a89 DG |
194 | goto error; |
195 | } | |
196 | ||
197 | switch (ev->type) { | |
198 | case LTTNG_EVENT_PROBE: | |
44d3bd01 | 199 | lue->attr.instrumentation = LTTNG_UST_PROBE; |
97ee3a89 DG |
200 | break; |
201 | case LTTNG_EVENT_FUNCTION: | |
44d3bd01 | 202 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
203 | break; |
204 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
44d3bd01 | 205 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
206 | break; |
207 | case LTTNG_EVENT_TRACEPOINT: | |
44d3bd01 | 208 | lue->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
97ee3a89 DG |
209 | break; |
210 | default: | |
211 | ERR("Unknown ust instrumentation type (%d)", ev->type); | |
212 | goto error; | |
213 | } | |
214 | ||
215 | /* Copy event name */ | |
44d3bd01 DG |
216 | strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
217 | lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
97ee3a89 | 218 | |
f6a9efaa DG |
219 | /* Init node */ |
220 | hashtable_node_init(&lue->node, (void *) lue->attr.name, | |
221 | strlen(lue->attr.name)); | |
222 | /* Alloc context hash tables */ | |
223 | lue->ctx = hashtable_new_str(5); | |
97ee3a89 DG |
224 | |
225 | return lue; | |
226 | ||
227 | error: | |
228 | return NULL; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Allocate and initialize a ust metadata. | |
233 | * | |
234 | * Return pointer to structure or NULL. | |
235 | */ | |
236 | struct ltt_ust_metadata *trace_ust_create_metadata(char *path) | |
237 | { | |
238 | int ret; | |
239 | struct ltt_ust_metadata *lum; | |
97ee3a89 DG |
240 | |
241 | lum = malloc(sizeof(struct ltt_ust_metadata)); | |
44d3bd01 | 242 | if (lum == NULL) { |
97ee3a89 DG |
243 | perror("ust metadata malloc"); |
244 | goto error; | |
245 | } | |
246 | ||
247 | /* Set default attributes */ | |
44d3bd01 DG |
248 | lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
249 | lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; | |
250 | lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
251 | lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
252 | lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
d41f73b7 | 253 | lum->attr.output = LTTNG_UST_MMAP; |
44d3bd01 | 254 | |
97ee3a89 DG |
255 | lum->handle = -1; |
256 | /* Set metadata trace path */ | |
f6a9efaa | 257 | ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path); |
97ee3a89 DG |
258 | if (ret < 0) { |
259 | perror("asprintf ust metadata"); | |
260 | goto error; | |
261 | } | |
262 | ||
263 | return lum; | |
264 | ||
265 | error: | |
266 | return NULL; | |
267 | } | |
268 | ||
f6a9efaa DG |
269 | /* |
270 | * RCU safe free context structure. | |
271 | */ | |
272 | static void destroy_context_rcu(struct rcu_head *head) | |
273 | { | |
274 | struct cds_lfht_node *node = | |
275 | caa_container_of(head, struct cds_lfht_node, head); | |
276 | struct ltt_ust_context *ctx = | |
277 | caa_container_of(node, struct ltt_ust_context, node); | |
278 | ||
279 | free(ctx); | |
280 | } | |
281 | ||
282 | /* | |
283 | * Cleanup UST context hash table. | |
284 | */ | |
285 | static void destroy_context(struct cds_lfht *ht) | |
286 | { | |
287 | int ret; | |
288 | struct cds_lfht_node *node; | |
289 | struct cds_lfht_iter iter; | |
290 | ||
291 | hashtable_get_first(ht, &iter); | |
292 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
293 | ret = hashtable_del(ht, &iter); | |
294 | if (!ret) { | |
295 | call_rcu(&node->head, destroy_context_rcu); | |
296 | } | |
297 | hashtable_get_next(ht, &iter); | |
298 | } | |
299 | } | |
300 | ||
97ee3a89 DG |
301 | /* |
302 | * Cleanup ust event structure. | |
303 | */ | |
304 | void trace_ust_destroy_event(struct ltt_ust_event *event) | |
305 | { | |
f6a9efaa DG |
306 | DBG2("Trace destroy UST event %s", event->attr.name); |
307 | destroy_context(event->ctx); | |
97ee3a89 DG |
308 | free(event); |
309 | } | |
310 | ||
f6a9efaa DG |
311 | /* |
312 | * URCU intermediate call to complete destroy event. | |
313 | */ | |
314 | static void destroy_event_rcu(struct rcu_head *head) | |
315 | { | |
316 | struct cds_lfht_node *node = | |
317 | caa_container_of(head, struct cds_lfht_node, head); | |
318 | struct ltt_ust_event *event = | |
319 | caa_container_of(node, struct ltt_ust_event, node); | |
320 | ||
321 | trace_ust_destroy_event(event); | |
322 | } | |
323 | ||
97ee3a89 DG |
324 | /* |
325 | * Cleanup ust channel structure. | |
326 | */ | |
327 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) | |
328 | { | |
f6a9efaa DG |
329 | int ret; |
330 | struct cds_lfht_node *node; | |
331 | struct cds_lfht_iter iter; | |
97ee3a89 | 332 | |
f6a9efaa | 333 | DBG2("Trace destroy UST channel %s", channel->name); |
97ee3a89 | 334 | |
f6a9efaa DG |
335 | rcu_read_lock(); |
336 | ||
337 | hashtable_get_first(channel->events, &iter); | |
338 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
339 | ret = hashtable_del(channel->events, &iter); | |
340 | if (!ret) { | |
341 | call_rcu(&node->head, destroy_event_rcu); | |
342 | } | |
343 | hashtable_get_next(channel->events, &iter); | |
97ee3a89 DG |
344 | } |
345 | ||
f6a9efaa DG |
346 | free(channel->events); |
347 | destroy_context(channel->ctx); | |
97ee3a89 | 348 | free(channel); |
f6a9efaa DG |
349 | |
350 | rcu_read_unlock(); | |
351 | } | |
352 | ||
353 | /* | |
354 | * URCU intermediate call to complete destroy channel. | |
355 | */ | |
356 | static void destroy_channel_rcu(struct rcu_head *head) | |
357 | { | |
358 | struct cds_lfht_node *node = | |
359 | caa_container_of(head, struct cds_lfht_node, head); | |
360 | struct ltt_ust_channel *channel = | |
361 | caa_container_of(node, struct ltt_ust_channel, node); | |
362 | ||
363 | trace_ust_destroy_channel(channel); | |
97ee3a89 DG |
364 | } |
365 | ||
366 | /* | |
367 | * Cleanup ust metadata structure. | |
368 | */ | |
369 | void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata) | |
370 | { | |
f6a9efaa | 371 | DBG2("Trace UST destroy metadata %d", metadata->handle); |
97ee3a89 | 372 | |
97ee3a89 DG |
373 | free(metadata); |
374 | } | |
375 | ||
376 | /* | |
f6a9efaa | 377 | * Iterate over a hash table containing channels and cleanup safely. |
97ee3a89 | 378 | */ |
f6a9efaa DG |
379 | static void destroy_channels(struct cds_lfht *channels) |
380 | { | |
381 | int ret; | |
382 | struct cds_lfht_node *node; | |
383 | struct cds_lfht_iter iter; | |
384 | ||
385 | hashtable_get_first(channels, &iter); | |
386 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
387 | ret = hashtable_del(channels, &iter); | |
388 | if (!ret) { | |
389 | call_rcu(&node->head, destroy_channel_rcu); | |
390 | } | |
391 | hashtable_get_next(channels, &iter); | |
392 | } | |
393 | } | |
394 | ||
395 | /* | |
396 | * Cleanup UST pid domain. | |
397 | */ | |
398 | static void destroy_domain_pid(struct cds_lfht *ht) | |
399 | { | |
400 | int ret; | |
401 | struct cds_lfht_node *node; | |
402 | struct cds_lfht_iter iter; | |
403 | struct ltt_ust_domain_pid *d; | |
404 | ||
405 | hashtable_get_first(ht, &iter); | |
406 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
407 | ret = hashtable_del(ht , &iter); | |
408 | if (!ret) { | |
409 | d = caa_container_of(node, struct ltt_ust_domain_pid, node); | |
410 | destroy_channels(d->channels); | |
411 | } | |
412 | hashtable_get_next(ht, &iter); | |
413 | } | |
414 | } | |
415 | ||
416 | /* | |
417 | * Cleanup UST exec name domain. | |
418 | */ | |
419 | static void destroy_domain_exec(struct cds_lfht *ht) | |
97ee3a89 | 420 | { |
f6a9efaa DG |
421 | int ret; |
422 | struct cds_lfht_node *node; | |
423 | struct cds_lfht_iter iter; | |
424 | struct ltt_ust_domain_exec *d; | |
425 | ||
426 | hashtable_get_first(ht, &iter); | |
427 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
428 | ret = hashtable_del(ht , &iter); | |
429 | if (!ret) { | |
430 | d = caa_container_of(node, struct ltt_ust_domain_exec, node); | |
431 | destroy_channels(d->channels); | |
432 | } | |
433 | hashtable_get_next(ht, &iter); | |
434 | } | |
435 | } | |
97ee3a89 | 436 | |
f6a9efaa DG |
437 | /* |
438 | * Cleanup UST global domain. | |
439 | */ | |
440 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) | |
441 | { | |
442 | destroy_channels(dom->channels); | |
443 | } | |
97ee3a89 | 444 | |
f6a9efaa DG |
445 | /* |
446 | * Cleanup ust session structure | |
447 | */ | |
448 | void trace_ust_destroy_session(struct ltt_ust_session *session) | |
449 | { | |
97ee3a89 DG |
450 | /* Extra safety */ |
451 | if (session == NULL) { | |
452 | return; | |
453 | } | |
454 | ||
f6a9efaa DG |
455 | rcu_read_lock(); |
456 | ||
48842b30 | 457 | DBG2("Trace UST destroy session %d", session->uid); |
f6a9efaa | 458 | |
48842b30 DG |
459 | //if (session->metadata != NULL) { |
460 | // trace_ust_destroy_metadata(session->metadata); | |
461 | //} | |
97ee3a89 | 462 | |
f6a9efaa DG |
463 | /* Cleaning up UST domain */ |
464 | destroy_domain_global(&session->domain_global); | |
465 | destroy_domain_pid(session->domain_pid); | |
466 | destroy_domain_exec(session->domain_exec); | |
44d3bd01 | 467 | |
97ee3a89 | 468 | free(session); |
f6a9efaa DG |
469 | |
470 | rcu_read_unlock(); | |
97ee3a89 | 471 | } |