Add missing Makefile.am in common/
[lttng-tools.git] / lttng-sessiond / trace-ust.c
CommitLineData
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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
daf282ab 27#include "../common/hashtable.h"
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28#include "trace-ust.h"
29
0177d773 30/*
f6a9efaa 31 * Find the channel in the hashtable.
0177d773 32 */
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33struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
34 char *name)
0177d773 35{
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36 struct cds_lfht_node *node;
37 struct cds_lfht_iter iter;
0177d773 38
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39 rcu_read_lock();
40 node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
41 if (node == NULL) {
42 rcu_read_unlock();
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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);
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50
51error:
f6a9efaa 52 DBG2("Trace UST channel %s not found by name", name);
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53 return NULL;
54}
55
56/*
f6a9efaa 57 * Find the event in the hashtable.
97ee3a89 58 */
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59struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
60 char *name)
97ee3a89 61{
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62 struct cds_lfht_node *node;
63 struct cds_lfht_iter iter;
97ee3a89 64
f6a9efaa 65 rcu_read_lock();
7f79d3a1 66 node = hashtable_lookup(ht, (void *)name, strlen(name), &iter);
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67 if (node == NULL) {
68 rcu_read_unlock();
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69 goto error;
70 }
f6a9efaa 71 rcu_read_unlock();
97ee3a89 72
284d8f55 73 DBG2("Trace UST event found by name %s", name);
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74
75 return caa_container_of(node, struct ltt_ust_event, node);
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76
77error:
284d8f55 78 DBG2("Trace UST event NOT found by name %s", name);
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79 return NULL;
80}
81
82/*
83 * Allocate and initialize a ust session data structure.
84 *
85 * Return pointer to structure or NULL.
86 */
a991f516 87struct ltt_ust_session *trace_ust_create_session(char *path, int session_id,
44d3bd01 88 struct lttng_domain *domain)
97ee3a89 89{
0177d773 90 int ret;
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91 struct ltt_ust_session *lus;
92
93 /* Allocate a new ltt ust session */
ba7f0ae5 94 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 95 if (lus == NULL) {
ba7f0ae5 96 PERROR("create ust session zmalloc");
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97 goto error;
98 }
99
100 /* Init data structure */
a991f516 101 lus->id = session_id;
36dc12cc 102 lus->start_trace = 0;
97ee3a89 103
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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;
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116 }
117
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118 DBG2("UST trace session create successful");
119
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120 return lus;
121
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122error_free_session:
123 free(lus);
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124error:
125 return NULL;
126}
127
128/*
129 * Allocate and initialize a ust channel data structure.
130 *
131 * Return pointer to structure or NULL.
132 */
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133struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
134 char *path)
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135{
136 int ret;
137 struct ltt_ust_channel *luc;
138
37357452 139 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 140 if (luc == NULL) {
ba7f0ae5 141 perror("ltt_ust_channel zmalloc");
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142 goto error;
143 }
144
44d3bd01 145 /* Copy UST channel attributes */
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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;
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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 */
0a1459bb 161 strncpy(luc->name, chan->name, sizeof(luc->name));
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162 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
163
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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);
55cc08a6 168 luc->ctx = hashtable_new(0);
f6a9efaa 169
97ee3a89 170 /* Set trace output path */
48842b30 171 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
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172 if (ret < 0) {
173 perror("asprintf ust create channel");
44844c29 174 goto error_free_channel;
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175 }
176
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177 DBG2("Trace UST channel %s created", luc->name);
178
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179 return luc;
180
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181error_free_channel:
182 free(luc);
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183error:
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 */
192struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
193{
194 struct ltt_ust_event *lue;
97ee3a89 195
37357452 196 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 197 if (lue == NULL) {
ba7f0ae5 198 PERROR("ust event zmalloc");
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199 goto error;
200 }
201
202 switch (ev->type) {
203 case LTTNG_EVENT_PROBE:
44d3bd01 204 lue->attr.instrumentation = LTTNG_UST_PROBE;
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205 break;
206 case LTTNG_EVENT_FUNCTION:
44d3bd01 207 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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208 break;
209 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 210 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
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211 break;
212 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 213 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89 214 break;
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215 case LTTNG_EVENT_TRACEPOINT_LOGLEVEL:
216 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT_LOGLEVEL;
217 break;
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218 default:
219 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 220 goto error_free_event;
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221 }
222
223 /* Copy event name */
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224 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
225 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 226
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227 /* Init node */
228 hashtable_node_init(&lue->node, (void *) lue->attr.name,
229 strlen(lue->attr.name));
230 /* Alloc context hash tables */
55cc08a6 231 lue->ctx = hashtable_new(0);
97ee3a89 232
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233 DBG2("Trace UST event %s created", lue->attr.name);
234
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235 return lue;
236
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237error_free_event:
238 free(lue);
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239error:
240 return NULL;
241}
242
243/*
244 * Allocate and initialize a ust metadata.
245 *
246 * Return pointer to structure or NULL.
247 */
248struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
249{
250 int ret;
251 struct ltt_ust_metadata *lum;
97ee3a89 252
3a009adb 253 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 254 if (lum == NULL) {
ba7f0ae5 255 perror("ust metadata zmalloc");
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256 goto error;
257 }
258
259 /* Set default attributes */
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260 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
261 lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
262 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
263 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
264 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 265 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 266
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267 lum->handle = -1;
268 /* Set metadata trace path */
f6a9efaa 269 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
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270 if (ret < 0) {
271 perror("asprintf ust metadata");
44844c29 272 goto error_free_metadata;
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273 }
274
275 return lum;
276
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277error_free_metadata:
278 free(lum);
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279error:
280 return NULL;
281}
282
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283/*
284 * Allocate and initialize an UST context.
285 *
286 * Return pointer to structure or NULL.
287 */
288struct ltt_ust_context *trace_ust_create_context(
289 struct lttng_event_context *ctx)
290{
291 struct ltt_ust_context *uctx;
292
293 uctx = zmalloc(sizeof(struct ltt_ust_context));
294 if (uctx == NULL) {
295 PERROR("zmalloc ltt_ust_context");
296 goto error;
297 }
298
299 uctx->ctx.ctx = ctx->ctx;
300 hashtable_node_init(&uctx->node, (void *)((unsigned long) uctx->ctx.ctx),
301 sizeof(void *));
302
303 return uctx;
304
305error:
306 return NULL;
307}
308
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309/*
310 * RCU safe free context structure.
311 */
312static void destroy_context_rcu(struct rcu_head *head)
313{
314 struct cds_lfht_node *node =
315 caa_container_of(head, struct cds_lfht_node, head);
316 struct ltt_ust_context *ctx =
317 caa_container_of(node, struct ltt_ust_context, node);
318
319 free(ctx);
320}
321
322/*
323 * Cleanup UST context hash table.
324 */
325static void destroy_context(struct cds_lfht *ht)
326{
327 int ret;
328 struct cds_lfht_node *node;
329 struct cds_lfht_iter iter;
330
ed52805d 331 cds_lfht_for_each(ht, &iter, node) {
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332 ret = hashtable_del(ht, &iter);
333 if (!ret) {
334 call_rcu(&node->head, destroy_context_rcu);
335 }
f6a9efaa 336 }
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337
338 hashtable_destroy(ht);
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339}
340
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341/*
342 * Cleanup ust event structure.
343 */
344void trace_ust_destroy_event(struct ltt_ust_event *event)
345{
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346 DBG2("Trace destroy UST event %s", event->attr.name);
347 destroy_context(event->ctx);
ed52805d 348
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349 free(event);
350}
351
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352/*
353 * URCU intermediate call to complete destroy event.
354 */
355static void destroy_event_rcu(struct rcu_head *head)
356{
357 struct cds_lfht_node *node =
358 caa_container_of(head, struct cds_lfht_node, head);
359 struct ltt_ust_event *event =
360 caa_container_of(node, struct ltt_ust_event, node);
361
362 trace_ust_destroy_event(event);
363}
364
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365/*
366 * Cleanup UST events hashtable.
367 */
368static void destroy_event(struct cds_lfht *events)
ed52805d
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369{
370 int ret;
371 struct cds_lfht_node *node;
372 struct cds_lfht_iter iter;
373
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374 cds_lfht_for_each(events, &iter, node) {
375 ret = hashtable_del(events, &iter);
ed52805d
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376 if (!ret) {
377 call_rcu(&node->head, destroy_event_rcu);
378 }
379 }
380
284d8f55 381 hashtable_destroy(events);
ed52805d
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382}
383
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384/*
385 * Cleanup ust channel structure.
386 */
387void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
388{
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389 int ret;
390 struct cds_lfht_node *node;
391 struct cds_lfht_iter iter;
97ee3a89 392
f6a9efaa 393 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 394
f6a9efaa
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395 rcu_read_lock();
396
ed52805d 397 cds_lfht_for_each(channel->events, &iter, node) {
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398 ret = hashtable_del(channel->events, &iter);
399 if (!ret) {
ed52805d 400 destroy_event(channel->events);
f6a9efaa 401 }
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402 }
403
f6a9efaa 404 destroy_context(channel->ctx);
97ee3a89 405 free(channel);
f6a9efaa
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406
407 rcu_read_unlock();
408}
409
410/*
411 * URCU intermediate call to complete destroy channel.
412 */
413static void destroy_channel_rcu(struct rcu_head *head)
414{
415 struct cds_lfht_node *node =
416 caa_container_of(head, struct cds_lfht_node, head);
417 struct ltt_ust_channel *channel =
418 caa_container_of(node, struct ltt_ust_channel, node);
419
420 trace_ust_destroy_channel(channel);
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421}
422
423/*
424 * Cleanup ust metadata structure.
425 */
426void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
427{
f6a9efaa 428 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89 429
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430 free(metadata);
431}
432
433/*
f6a9efaa 434 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 435 */
f6a9efaa
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436static void destroy_channels(struct cds_lfht *channels)
437{
438 int ret;
439 struct cds_lfht_node *node;
440 struct cds_lfht_iter iter;
441
ed52805d 442 cds_lfht_for_each(channels, &iter, node) {
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443 ret = hashtable_del(channels, &iter);
444 if (!ret) {
445 call_rcu(&node->head, destroy_channel_rcu);
446 }
f6a9efaa 447 }
ed52805d
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448
449 hashtable_destroy(channels);
f6a9efaa
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450}
451
452/*
453 * Cleanup UST pid domain.
454 */
455static void destroy_domain_pid(struct cds_lfht *ht)
456{
457 int ret;
f6a9efaa 458 struct cds_lfht_iter iter;
ed52805d 459 struct ltt_ust_domain_pid *dpid;
f6a9efaa 460
ed52805d 461 cds_lfht_for_each_entry(ht, &iter, dpid, node) {
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462 ret = hashtable_del(ht , &iter);
463 if (!ret) {
ed52805d 464 destroy_channels(dpid->channels);
f6a9efaa 465 }
f6a9efaa 466 }
ed52805d
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467
468 hashtable_destroy(ht);
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469}
470
471/*
472 * Cleanup UST exec name domain.
473 */
474static void destroy_domain_exec(struct cds_lfht *ht)
97ee3a89 475{
f6a9efaa 476 int ret;
f6a9efaa 477 struct cds_lfht_iter iter;
ed52805d 478 struct ltt_ust_domain_exec *dexec;
f6a9efaa 479
ed52805d 480 cds_lfht_for_each_entry(ht, &iter, dexec, node) {
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481 ret = hashtable_del(ht , &iter);
482 if (!ret) {
ed52805d 483 destroy_channels(dexec->channels);
f6a9efaa 484 }
f6a9efaa 485 }
ed52805d
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486
487 hashtable_destroy(ht);
f6a9efaa 488}
97ee3a89 489
f6a9efaa
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490/*
491 * Cleanup UST global domain.
492 */
493static void destroy_domain_global(struct ltt_ust_domain_global *dom)
494{
495 destroy_channels(dom->channels);
496}
97ee3a89 497
f6a9efaa
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498/*
499 * Cleanup ust session structure
500 */
501void trace_ust_destroy_session(struct ltt_ust_session *session)
502{
ed52805d 503 /* Extra protection */
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504 if (session == NULL) {
505 return;
506 }
507
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508 rcu_read_lock();
509
a991f516 510 DBG2("Trace UST destroy session %d", session->id);
f6a9efaa 511
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512 /* Cleaning up UST domain */
513 destroy_domain_global(&session->domain_global);
514 destroy_domain_pid(session->domain_pid);
515 destroy_domain_exec(session->domain_exec);
44d3bd01 516
97ee3a89 517 free(session);
f6a9efaa
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518
519 rcu_read_unlock();
97ee3a89 520}
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