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) { | |
36dc12cc | 95 | PERROR("create ust session malloc"); |
97ee3a89 DG |
96 | goto error; |
97 | } | |
98 | ||
99 | /* Init data structure */ | |
3bd1e081 | 100 | lus->consumer_fds_sent = 0; |
48842b30 | 101 | lus->uid = uid; |
36dc12cc | 102 | lus->start_trace = 0; |
97ee3a89 | 103 | |
f6a9efaa DG |
104 | /* Alloc UST domain hash tables */ |
105 | lus->domain_pid = hashtable_new(0); | |
106 | lus->domain_exec = hashtable_new_str(0); | |
107 | ||
108 | /* Alloc UST global domain channels' HT */ | |
109 | lus->domain_global.channels = hashtable_new_str(0); | |
44d3bd01 | 110 | |
0177d773 | 111 | /* Set session path */ |
48842b30 | 112 | ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path); |
0177d773 | 113 | if (ret < 0) { |
44d3bd01 | 114 | PERROR("snprintf kernel traces path"); |
0177d773 DG |
115 | goto error; |
116 | } | |
117 | ||
44d3bd01 DG |
118 | DBG2("UST trace session create successful"); |
119 | ||
97ee3a89 DG |
120 | return lus; |
121 | ||
122 | error: | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Allocate and initialize a ust channel data structure. | |
128 | * | |
129 | * Return pointer to structure or NULL. | |
130 | */ | |
44d3bd01 DG |
131 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan, |
132 | char *path) | |
97ee3a89 DG |
133 | { |
134 | int ret; | |
135 | struct ltt_ust_channel *luc; | |
136 | ||
137 | luc = malloc(sizeof(struct ltt_ust_channel)); | |
138 | if (luc == NULL) { | |
139 | perror("ltt_ust_channel malloc"); | |
140 | goto error; | |
141 | } | |
142 | ||
44d3bd01 | 143 | /* Copy UST channel attributes */ |
48842b30 DG |
144 | luc->attr.overwrite = chan->attr.overwrite; |
145 | luc->attr.subbuf_size = chan->attr.subbuf_size; | |
146 | luc->attr.num_subbuf = chan->attr.num_subbuf; | |
147 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; | |
148 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; | |
149 | luc->attr.output = chan->attr.output; | |
44d3bd01 DG |
150 | |
151 | /* Translate to UST output enum */ | |
152 | switch (luc->attr.output) { | |
153 | default: | |
154 | luc->attr.output = LTTNG_UST_MMAP; | |
155 | break; | |
97ee3a89 | 156 | } |
97ee3a89 | 157 | |
97ee3a89 | 158 | /* Copy channel name */ |
44d3bd01 | 159 | strncpy(luc->name, chan->name, sizeof(&luc->name)); |
97ee3a89 DG |
160 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
161 | ||
f6a9efaa DG |
162 | /* Init node */ |
163 | hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name)); | |
164 | /* Alloc hash tables */ | |
165 | luc->events = hashtable_new_str(0); | |
166 | luc->ctx = hashtable_new_str(0); | |
167 | ||
97ee3a89 | 168 | /* Set trace output path */ |
48842b30 | 169 | ret = snprintf(luc->pathname, PATH_MAX, "%s", path); |
97ee3a89 DG |
170 | if (ret < 0) { |
171 | perror("asprintf ust create channel"); | |
172 | goto error; | |
173 | } | |
174 | ||
f6a9efaa DG |
175 | DBG2("Trace UST channel %s created", luc->name); |
176 | ||
97ee3a89 DG |
177 | return luc; |
178 | ||
179 | error: | |
180 | return NULL; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Allocate and initialize a ust event. Set name and event type. | |
185 | * | |
186 | * Return pointer to structure or NULL. | |
187 | */ | |
188 | struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev) | |
189 | { | |
190 | struct ltt_ust_event *lue; | |
97ee3a89 DG |
191 | |
192 | lue = malloc(sizeof(struct ltt_ust_event)); | |
44d3bd01 DG |
193 | if (lue == NULL) { |
194 | PERROR("ust event malloc"); | |
97ee3a89 DG |
195 | goto error; |
196 | } | |
197 | ||
198 | switch (ev->type) { | |
199 | case LTTNG_EVENT_PROBE: | |
44d3bd01 | 200 | lue->attr.instrumentation = LTTNG_UST_PROBE; |
97ee3a89 DG |
201 | break; |
202 | case LTTNG_EVENT_FUNCTION: | |
44d3bd01 | 203 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
204 | break; |
205 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
44d3bd01 | 206 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
207 | break; |
208 | case LTTNG_EVENT_TRACEPOINT: | |
44d3bd01 | 209 | lue->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
97ee3a89 DG |
210 | break; |
211 | default: | |
212 | ERR("Unknown ust instrumentation type (%d)", ev->type); | |
213 | goto error; | |
214 | } | |
215 | ||
216 | /* Copy event name */ | |
44d3bd01 DG |
217 | strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
218 | lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
97ee3a89 | 219 | |
f6a9efaa DG |
220 | /* Init node */ |
221 | hashtable_node_init(&lue->node, (void *) lue->attr.name, | |
222 | strlen(lue->attr.name)); | |
223 | /* Alloc context hash tables */ | |
e03e3332 | 224 | lue->ctx = hashtable_new_str(0); |
97ee3a89 DG |
225 | |
226 | return lue; | |
227 | ||
228 | error: | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Allocate and initialize a ust metadata. | |
234 | * | |
235 | * Return pointer to structure or NULL. | |
236 | */ | |
237 | struct ltt_ust_metadata *trace_ust_create_metadata(char *path) | |
238 | { | |
239 | int ret; | |
240 | struct ltt_ust_metadata *lum; | |
97ee3a89 DG |
241 | |
242 | lum = malloc(sizeof(struct ltt_ust_metadata)); | |
44d3bd01 | 243 | if (lum == NULL) { |
97ee3a89 DG |
244 | perror("ust metadata malloc"); |
245 | goto error; | |
246 | } | |
247 | ||
248 | /* Set default attributes */ | |
44d3bd01 DG |
249 | lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
250 | lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; | |
251 | lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
252 | lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
253 | lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
d41f73b7 | 254 | lum->attr.output = LTTNG_UST_MMAP; |
44d3bd01 | 255 | |
97ee3a89 DG |
256 | lum->handle = -1; |
257 | /* Set metadata trace path */ | |
f6a9efaa | 258 | ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path); |
97ee3a89 DG |
259 | if (ret < 0) { |
260 | perror("asprintf ust metadata"); | |
261 | goto error; | |
262 | } | |
263 | ||
264 | return lum; | |
265 | ||
266 | error: | |
267 | return NULL; | |
268 | } | |
269 | ||
f6a9efaa DG |
270 | /* |
271 | * RCU safe free context structure. | |
272 | */ | |
273 | static void destroy_context_rcu(struct rcu_head *head) | |
274 | { | |
275 | struct cds_lfht_node *node = | |
276 | caa_container_of(head, struct cds_lfht_node, head); | |
277 | struct ltt_ust_context *ctx = | |
278 | caa_container_of(node, struct ltt_ust_context, node); | |
279 | ||
280 | free(ctx); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Cleanup UST context hash table. | |
285 | */ | |
286 | static void destroy_context(struct cds_lfht *ht) | |
287 | { | |
288 | int ret; | |
289 | struct cds_lfht_node *node; | |
290 | struct cds_lfht_iter iter; | |
291 | ||
292 | hashtable_get_first(ht, &iter); | |
293 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
294 | ret = hashtable_del(ht, &iter); | |
295 | if (!ret) { | |
296 | call_rcu(&node->head, destroy_context_rcu); | |
297 | } | |
298 | hashtable_get_next(ht, &iter); | |
299 | } | |
300 | } | |
301 | ||
97ee3a89 DG |
302 | /* |
303 | * Cleanup ust event structure. | |
304 | */ | |
305 | void trace_ust_destroy_event(struct ltt_ust_event *event) | |
306 | { | |
f6a9efaa DG |
307 | DBG2("Trace destroy UST event %s", event->attr.name); |
308 | destroy_context(event->ctx); | |
97ee3a89 DG |
309 | free(event); |
310 | } | |
311 | ||
f6a9efaa DG |
312 | /* |
313 | * URCU intermediate call to complete destroy event. | |
314 | */ | |
315 | static void destroy_event_rcu(struct rcu_head *head) | |
316 | { | |
317 | struct cds_lfht_node *node = | |
318 | caa_container_of(head, struct cds_lfht_node, head); | |
319 | struct ltt_ust_event *event = | |
320 | caa_container_of(node, struct ltt_ust_event, node); | |
321 | ||
322 | trace_ust_destroy_event(event); | |
323 | } | |
324 | ||
97ee3a89 DG |
325 | /* |
326 | * Cleanup ust channel structure. | |
327 | */ | |
328 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) | |
329 | { | |
f6a9efaa DG |
330 | int ret; |
331 | struct cds_lfht_node *node; | |
332 | struct cds_lfht_iter iter; | |
97ee3a89 | 333 | |
f6a9efaa | 334 | DBG2("Trace destroy UST channel %s", channel->name); |
97ee3a89 | 335 | |
f6a9efaa DG |
336 | rcu_read_lock(); |
337 | ||
338 | hashtable_get_first(channel->events, &iter); | |
339 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
340 | ret = hashtable_del(channel->events, &iter); | |
341 | if (!ret) { | |
342 | call_rcu(&node->head, destroy_event_rcu); | |
343 | } | |
344 | hashtable_get_next(channel->events, &iter); | |
97ee3a89 DG |
345 | } |
346 | ||
f6a9efaa DG |
347 | free(channel->events); |
348 | destroy_context(channel->ctx); | |
97ee3a89 | 349 | free(channel); |
f6a9efaa DG |
350 | |
351 | rcu_read_unlock(); | |
352 | } | |
353 | ||
354 | /* | |
355 | * URCU intermediate call to complete destroy channel. | |
356 | */ | |
357 | static void destroy_channel_rcu(struct rcu_head *head) | |
358 | { | |
359 | struct cds_lfht_node *node = | |
360 | caa_container_of(head, struct cds_lfht_node, head); | |
361 | struct ltt_ust_channel *channel = | |
362 | caa_container_of(node, struct ltt_ust_channel, node); | |
363 | ||
364 | trace_ust_destroy_channel(channel); | |
97ee3a89 DG |
365 | } |
366 | ||
367 | /* | |
368 | * Cleanup ust metadata structure. | |
369 | */ | |
370 | void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata) | |
371 | { | |
f6a9efaa | 372 | DBG2("Trace UST destroy metadata %d", metadata->handle); |
97ee3a89 | 373 | |
97ee3a89 DG |
374 | free(metadata); |
375 | } | |
376 | ||
377 | /* | |
f6a9efaa | 378 | * Iterate over a hash table containing channels and cleanup safely. |
97ee3a89 | 379 | */ |
f6a9efaa DG |
380 | static void destroy_channels(struct cds_lfht *channels) |
381 | { | |
382 | int ret; | |
383 | struct cds_lfht_node *node; | |
384 | struct cds_lfht_iter iter; | |
385 | ||
386 | hashtable_get_first(channels, &iter); | |
387 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
388 | ret = hashtable_del(channels, &iter); | |
389 | if (!ret) { | |
390 | call_rcu(&node->head, destroy_channel_rcu); | |
391 | } | |
392 | hashtable_get_next(channels, &iter); | |
393 | } | |
394 | } | |
395 | ||
396 | /* | |
397 | * Cleanup UST pid domain. | |
398 | */ | |
399 | static void destroy_domain_pid(struct cds_lfht *ht) | |
400 | { | |
401 | int ret; | |
402 | struct cds_lfht_node *node; | |
403 | struct cds_lfht_iter iter; | |
404 | struct ltt_ust_domain_pid *d; | |
405 | ||
406 | hashtable_get_first(ht, &iter); | |
407 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
408 | ret = hashtable_del(ht , &iter); | |
409 | if (!ret) { | |
410 | d = caa_container_of(node, struct ltt_ust_domain_pid, node); | |
411 | destroy_channels(d->channels); | |
412 | } | |
413 | hashtable_get_next(ht, &iter); | |
414 | } | |
415 | } | |
416 | ||
417 | /* | |
418 | * Cleanup UST exec name domain. | |
419 | */ | |
420 | static void destroy_domain_exec(struct cds_lfht *ht) | |
97ee3a89 | 421 | { |
f6a9efaa DG |
422 | int ret; |
423 | struct cds_lfht_node *node; | |
424 | struct cds_lfht_iter iter; | |
425 | struct ltt_ust_domain_exec *d; | |
426 | ||
427 | hashtable_get_first(ht, &iter); | |
428 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
429 | ret = hashtable_del(ht , &iter); | |
430 | if (!ret) { | |
431 | d = caa_container_of(node, struct ltt_ust_domain_exec, node); | |
432 | destroy_channels(d->channels); | |
433 | } | |
434 | hashtable_get_next(ht, &iter); | |
435 | } | |
436 | } | |
97ee3a89 | 437 | |
f6a9efaa DG |
438 | /* |
439 | * Cleanup UST global domain. | |
440 | */ | |
441 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) | |
442 | { | |
443 | destroy_channels(dom->channels); | |
444 | } | |
97ee3a89 | 445 | |
f6a9efaa DG |
446 | /* |
447 | * Cleanup ust session structure | |
448 | */ | |
449 | void trace_ust_destroy_session(struct ltt_ust_session *session) | |
450 | { | |
97ee3a89 DG |
451 | /* Extra safety */ |
452 | if (session == NULL) { | |
453 | return; | |
454 | } | |
455 | ||
f6a9efaa DG |
456 | rcu_read_lock(); |
457 | ||
48842b30 | 458 | DBG2("Trace UST destroy session %d", session->uid); |
f6a9efaa | 459 | |
48842b30 DG |
460 | //if (session->metadata != NULL) { |
461 | // trace_ust_destroy_metadata(session->metadata); | |
462 | //} | |
97ee3a89 | 463 | |
f6a9efaa DG |
464 | /* Cleaning up UST domain */ |
465 | destroy_domain_global(&session->domain_global); | |
466 | destroy_domain_pid(session->domain_pid); | |
467 | destroy_domain_exec(session->domain_exec); | |
44d3bd01 | 468 | |
97ee3a89 | 469 | free(session); |
f6a9efaa DG |
470 | |
471 | rcu_read_unlock(); | |
97ee3a89 | 472 | } |