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"); |
44844c29 | 115 | goto error_free_session; |
0177d773 DG |
116 | } |
117 | ||
44d3bd01 DG |
118 | DBG2("UST trace session create successful"); |
119 | ||
97ee3a89 DG |
120 | return lus; |
121 | ||
44844c29 MD |
122 | error_free_session: |
123 | free(lus); | |
97ee3a89 DG |
124 | error: |
125 | return NULL; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Allocate and initialize a ust channel data structure. | |
130 | * | |
131 | * Return pointer to structure or NULL. | |
132 | */ | |
44d3bd01 DG |
133 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan, |
134 | char *path) | |
97ee3a89 DG |
135 | { |
136 | int ret; | |
137 | struct ltt_ust_channel *luc; | |
138 | ||
139 | luc = malloc(sizeof(struct ltt_ust_channel)); | |
140 | if (luc == NULL) { | |
141 | perror("ltt_ust_channel malloc"); | |
142 | goto error; | |
143 | } | |
144 | ||
44d3bd01 | 145 | /* Copy UST channel attributes */ |
48842b30 DG |
146 | luc->attr.overwrite = chan->attr.overwrite; |
147 | luc->attr.subbuf_size = chan->attr.subbuf_size; | |
148 | luc->attr.num_subbuf = chan->attr.num_subbuf; | |
149 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; | |
150 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; | |
151 | luc->attr.output = chan->attr.output; | |
44d3bd01 DG |
152 | |
153 | /* Translate to UST output enum */ | |
154 | switch (luc->attr.output) { | |
155 | default: | |
156 | luc->attr.output = LTTNG_UST_MMAP; | |
157 | break; | |
97ee3a89 | 158 | } |
97ee3a89 | 159 | |
97ee3a89 | 160 | /* Copy channel name */ |
44d3bd01 | 161 | strncpy(luc->name, chan->name, sizeof(&luc->name)); |
97ee3a89 DG |
162 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
163 | ||
f6a9efaa DG |
164 | /* Init node */ |
165 | hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name)); | |
166 | /* Alloc hash tables */ | |
167 | luc->events = hashtable_new_str(0); | |
168 | luc->ctx = hashtable_new_str(0); | |
169 | ||
97ee3a89 | 170 | /* Set trace output path */ |
48842b30 | 171 | ret = snprintf(luc->pathname, PATH_MAX, "%s", path); |
97ee3a89 DG |
172 | if (ret < 0) { |
173 | perror("asprintf ust create channel"); | |
44844c29 | 174 | goto error_free_channel; |
97ee3a89 DG |
175 | } |
176 | ||
f6a9efaa DG |
177 | DBG2("Trace UST channel %s created", luc->name); |
178 | ||
97ee3a89 DG |
179 | return luc; |
180 | ||
44844c29 MD |
181 | error_free_channel: |
182 | free(luc); | |
97ee3a89 DG |
183 | error: |
184 | return NULL; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Allocate and initialize a ust event. Set name and event type. | |
189 | * | |
190 | * Return pointer to structure or NULL. | |
191 | */ | |
192 | struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev) | |
193 | { | |
194 | struct ltt_ust_event *lue; | |
97ee3a89 DG |
195 | |
196 | lue = malloc(sizeof(struct ltt_ust_event)); | |
44d3bd01 DG |
197 | if (lue == NULL) { |
198 | PERROR("ust event malloc"); | |
97ee3a89 DG |
199 | goto error; |
200 | } | |
201 | ||
202 | switch (ev->type) { | |
203 | case LTTNG_EVENT_PROBE: | |
44d3bd01 | 204 | lue->attr.instrumentation = LTTNG_UST_PROBE; |
97ee3a89 DG |
205 | break; |
206 | case LTTNG_EVENT_FUNCTION: | |
44d3bd01 | 207 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
208 | break; |
209 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
44d3bd01 | 210 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
97ee3a89 DG |
211 | break; |
212 | case LTTNG_EVENT_TRACEPOINT: | |
44d3bd01 | 213 | lue->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
97ee3a89 DG |
214 | break; |
215 | default: | |
216 | ERR("Unknown ust instrumentation type (%d)", ev->type); | |
44844c29 | 217 | goto error_free_event; |
97ee3a89 DG |
218 | } |
219 | ||
220 | /* Copy event name */ | |
44d3bd01 DG |
221 | strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
222 | lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
97ee3a89 | 223 | |
f6a9efaa DG |
224 | /* Init node */ |
225 | hashtable_node_init(&lue->node, (void *) lue->attr.name, | |
226 | strlen(lue->attr.name)); | |
227 | /* Alloc context hash tables */ | |
e03e3332 | 228 | lue->ctx = hashtable_new_str(0); |
97ee3a89 DG |
229 | |
230 | return lue; | |
231 | ||
44844c29 MD |
232 | error_free_event: |
233 | free(lue); | |
97ee3a89 DG |
234 | error: |
235 | return NULL; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Allocate and initialize a ust metadata. | |
240 | * | |
241 | * Return pointer to structure or NULL. | |
242 | */ | |
243 | struct ltt_ust_metadata *trace_ust_create_metadata(char *path) | |
244 | { | |
245 | int ret; | |
246 | struct ltt_ust_metadata *lum; | |
97ee3a89 | 247 | |
3a009adb | 248 | lum = zmalloc(sizeof(struct ltt_ust_metadata)); |
44d3bd01 | 249 | if (lum == NULL) { |
97ee3a89 DG |
250 | perror("ust metadata malloc"); |
251 | goto error; | |
252 | } | |
253 | ||
254 | /* Set default attributes */ | |
44d3bd01 DG |
255 | lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
256 | lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE; | |
257 | lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
258 | lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
259 | lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
d41f73b7 | 260 | lum->attr.output = LTTNG_UST_MMAP; |
44d3bd01 | 261 | |
97ee3a89 DG |
262 | lum->handle = -1; |
263 | /* Set metadata trace path */ | |
f6a9efaa | 264 | ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path); |
97ee3a89 DG |
265 | if (ret < 0) { |
266 | perror("asprintf ust metadata"); | |
44844c29 | 267 | goto error_free_metadata; |
97ee3a89 DG |
268 | } |
269 | ||
270 | return lum; | |
271 | ||
44844c29 MD |
272 | error_free_metadata: |
273 | free(lum); | |
97ee3a89 DG |
274 | error: |
275 | return NULL; | |
276 | } | |
277 | ||
f6a9efaa DG |
278 | /* |
279 | * RCU safe free context structure. | |
280 | */ | |
281 | static void destroy_context_rcu(struct rcu_head *head) | |
282 | { | |
283 | struct cds_lfht_node *node = | |
284 | caa_container_of(head, struct cds_lfht_node, head); | |
285 | struct ltt_ust_context *ctx = | |
286 | caa_container_of(node, struct ltt_ust_context, node); | |
287 | ||
288 | free(ctx); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Cleanup UST context hash table. | |
293 | */ | |
294 | static void destroy_context(struct cds_lfht *ht) | |
295 | { | |
296 | int ret; | |
297 | struct cds_lfht_node *node; | |
298 | struct cds_lfht_iter iter; | |
299 | ||
300 | hashtable_get_first(ht, &iter); | |
301 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
302 | ret = hashtable_del(ht, &iter); | |
303 | if (!ret) { | |
304 | call_rcu(&node->head, destroy_context_rcu); | |
305 | } | |
306 | hashtable_get_next(ht, &iter); | |
307 | } | |
308 | } | |
309 | ||
97ee3a89 DG |
310 | /* |
311 | * Cleanup ust event structure. | |
312 | */ | |
313 | void trace_ust_destroy_event(struct ltt_ust_event *event) | |
314 | { | |
f6a9efaa DG |
315 | DBG2("Trace destroy UST event %s", event->attr.name); |
316 | destroy_context(event->ctx); | |
97ee3a89 DG |
317 | free(event); |
318 | } | |
319 | ||
f6a9efaa DG |
320 | /* |
321 | * URCU intermediate call to complete destroy event. | |
322 | */ | |
323 | static void destroy_event_rcu(struct rcu_head *head) | |
324 | { | |
325 | struct cds_lfht_node *node = | |
326 | caa_container_of(head, struct cds_lfht_node, head); | |
327 | struct ltt_ust_event *event = | |
328 | caa_container_of(node, struct ltt_ust_event, node); | |
329 | ||
330 | trace_ust_destroy_event(event); | |
331 | } | |
332 | ||
97ee3a89 DG |
333 | /* |
334 | * Cleanup ust channel structure. | |
335 | */ | |
336 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) | |
337 | { | |
f6a9efaa DG |
338 | int ret; |
339 | struct cds_lfht_node *node; | |
340 | struct cds_lfht_iter iter; | |
97ee3a89 | 341 | |
f6a9efaa | 342 | DBG2("Trace destroy UST channel %s", channel->name); |
97ee3a89 | 343 | |
f6a9efaa DG |
344 | rcu_read_lock(); |
345 | ||
346 | hashtable_get_first(channel->events, &iter); | |
347 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
348 | ret = hashtable_del(channel->events, &iter); | |
349 | if (!ret) { | |
350 | call_rcu(&node->head, destroy_event_rcu); | |
351 | } | |
352 | hashtable_get_next(channel->events, &iter); | |
97ee3a89 DG |
353 | } |
354 | ||
f6a9efaa DG |
355 | free(channel->events); |
356 | destroy_context(channel->ctx); | |
97ee3a89 | 357 | free(channel); |
f6a9efaa DG |
358 | |
359 | rcu_read_unlock(); | |
360 | } | |
361 | ||
362 | /* | |
363 | * URCU intermediate call to complete destroy channel. | |
364 | */ | |
365 | static void destroy_channel_rcu(struct rcu_head *head) | |
366 | { | |
367 | struct cds_lfht_node *node = | |
368 | caa_container_of(head, struct cds_lfht_node, head); | |
369 | struct ltt_ust_channel *channel = | |
370 | caa_container_of(node, struct ltt_ust_channel, node); | |
371 | ||
372 | trace_ust_destroy_channel(channel); | |
97ee3a89 DG |
373 | } |
374 | ||
375 | /* | |
376 | * Cleanup ust metadata structure. | |
377 | */ | |
378 | void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata) | |
379 | { | |
f6a9efaa | 380 | DBG2("Trace UST destroy metadata %d", metadata->handle); |
97ee3a89 | 381 | |
97ee3a89 DG |
382 | free(metadata); |
383 | } | |
384 | ||
385 | /* | |
f6a9efaa | 386 | * Iterate over a hash table containing channels and cleanup safely. |
97ee3a89 | 387 | */ |
f6a9efaa DG |
388 | static void destroy_channels(struct cds_lfht *channels) |
389 | { | |
390 | int ret; | |
391 | struct cds_lfht_node *node; | |
392 | struct cds_lfht_iter iter; | |
393 | ||
394 | hashtable_get_first(channels, &iter); | |
395 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
396 | ret = hashtable_del(channels, &iter); | |
397 | if (!ret) { | |
398 | call_rcu(&node->head, destroy_channel_rcu); | |
399 | } | |
400 | hashtable_get_next(channels, &iter); | |
401 | } | |
402 | } | |
403 | ||
404 | /* | |
405 | * Cleanup UST pid domain. | |
406 | */ | |
407 | static void destroy_domain_pid(struct cds_lfht *ht) | |
408 | { | |
409 | int ret; | |
410 | struct cds_lfht_node *node; | |
411 | struct cds_lfht_iter iter; | |
412 | struct ltt_ust_domain_pid *d; | |
413 | ||
414 | hashtable_get_first(ht, &iter); | |
415 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
416 | ret = hashtable_del(ht , &iter); | |
417 | if (!ret) { | |
418 | d = caa_container_of(node, struct ltt_ust_domain_pid, node); | |
419 | destroy_channels(d->channels); | |
420 | } | |
421 | hashtable_get_next(ht, &iter); | |
422 | } | |
423 | } | |
424 | ||
425 | /* | |
426 | * Cleanup UST exec name domain. | |
427 | */ | |
428 | static void destroy_domain_exec(struct cds_lfht *ht) | |
97ee3a89 | 429 | { |
f6a9efaa DG |
430 | int ret; |
431 | struct cds_lfht_node *node; | |
432 | struct cds_lfht_iter iter; | |
433 | struct ltt_ust_domain_exec *d; | |
434 | ||
435 | hashtable_get_first(ht, &iter); | |
436 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
437 | ret = hashtable_del(ht , &iter); | |
438 | if (!ret) { | |
439 | d = caa_container_of(node, struct ltt_ust_domain_exec, node); | |
440 | destroy_channels(d->channels); | |
441 | } | |
442 | hashtable_get_next(ht, &iter); | |
443 | } | |
444 | } | |
97ee3a89 | 445 | |
f6a9efaa DG |
446 | /* |
447 | * Cleanup UST global domain. | |
448 | */ | |
449 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) | |
450 | { | |
451 | destroy_channels(dom->channels); | |
452 | } | |
97ee3a89 | 453 | |
f6a9efaa DG |
454 | /* |
455 | * Cleanup ust session structure | |
456 | */ | |
457 | void trace_ust_destroy_session(struct ltt_ust_session *session) | |
458 | { | |
97ee3a89 DG |
459 | /* Extra safety */ |
460 | if (session == NULL) { | |
461 | return; | |
462 | } | |
463 | ||
f6a9efaa DG |
464 | rcu_read_lock(); |
465 | ||
48842b30 | 466 | DBG2("Trace UST destroy session %d", session->uid); |
f6a9efaa | 467 | |
48842b30 DG |
468 | //if (session->metadata != NULL) { |
469 | // trace_ust_destroy_metadata(session->metadata); | |
470 | //} | |
97ee3a89 | 471 | |
f6a9efaa DG |
472 | /* Cleaning up UST domain */ |
473 | destroy_domain_global(&session->domain_global); | |
474 | destroy_domain_pid(session->domain_pid); | |
475 | destroy_domain_exec(session->domain_exec); | |
44d3bd01 | 476 | |
97ee3a89 | 477 | free(session); |
f6a9efaa DG |
478 | |
479 | rcu_read_unlock(); | |
97ee3a89 | 480 | } |