Commit | Line | Data |
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54d01ffb 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 | ||
d87bfb32 | 18 | #include <errno.h> |
54d01ffb | 19 | #include <urcu/list.h> |
2bdd86d4 | 20 | #include <string.h> |
54d01ffb DG |
21 | |
22 | #include <lttng/lttng.h> | |
23 | #include <lttng-sessiond-comm.h> | |
24 | #include <lttngerr.h> | |
25 | ||
26 | #include "channel.h" | |
27 | #include "event.h" | |
48842b30 | 28 | #include "hashtable.h" |
4771f025 | 29 | #include "kernel.h" |
9df8df5e | 30 | #include "ust-ctl.h" |
edb67388 DG |
31 | #include "ust-app.h" |
32 | #include "trace-kernel.h" | |
33 | #include "trace-ust.h" | |
54d01ffb | 34 | |
8c9ae521 DG |
35 | /* |
36 | * Setup a lttng_event used to enable *all* syscall tracing. | |
37 | */ | |
38 | static void init_syscalls_kernel_event(struct lttng_event *event) | |
39 | { | |
40 | event->name[0] = '\0'; | |
41 | /* | |
42 | * We use LTTNG_EVENT* here since the trace kernel creation will make the | |
43 | * right changes for the kernel. | |
44 | */ | |
45 | event->type = LTTNG_EVENT_SYSCALL; | |
46 | } | |
47 | ||
54d01ffb | 48 | /* |
7a3d1328 | 49 | * Disable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 50 | */ |
7a3d1328 | 51 | int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
52 | struct ltt_kernel_channel *kchan, char *event_name) |
53 | { | |
54 | int ret; | |
55 | struct ltt_kernel_event *kevent; | |
56 | ||
57 | kevent = trace_kernel_get_event_by_name(event_name, kchan); | |
58 | if (kevent == NULL) { | |
59 | ret = LTTCOMM_NO_EVENT; | |
60 | goto error; | |
61 | } | |
62 | ||
63 | ret = kernel_disable_event(kevent); | |
64 | if (ret < 0) { | |
65 | ret = LTTCOMM_KERN_DISABLE_FAIL; | |
66 | goto error; | |
67 | } | |
68 | ||
69 | DBG("Kernel event %s disable for channel %s.", | |
70 | kevent->event->name, kchan->channel->name); | |
71 | ||
72 | ret = LTTCOMM_OK; | |
73 | ||
74 | error: | |
75 | return ret; | |
76 | } | |
77 | ||
78 | /* | |
7a3d1328 | 79 | * Disable kernel tracepoint events for a channel from the kernel session. |
54d01ffb | 80 | */ |
7a3d1328 | 81 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
82 | struct ltt_kernel_channel *kchan) |
83 | { | |
84 | int ret; | |
85 | struct ltt_kernel_event *kevent; | |
86 | ||
87 | /* For each event in the kernel session */ | |
88 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
89 | ret = kernel_disable_event(kevent); | |
90 | if (ret < 0) { | |
91 | /* We continue disabling the rest */ | |
92 | continue; | |
93 | } | |
94 | } | |
54d01ffb | 95 | ret = LTTCOMM_OK; |
7a3d1328 MD |
96 | return ret; |
97 | } | |
98 | ||
99 | /* | |
100 | * Disable kernel syscall events for a channel from the kernel session. | |
101 | */ | |
102 | int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession, | |
103 | struct ltt_kernel_channel *kchan) | |
104 | { | |
105 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); | |
106 | return LTTCOMM_OK; /* Return OK so disable all succeeds */ | |
107 | } | |
54d01ffb | 108 | |
7a3d1328 MD |
109 | /* |
110 | * Disable all kernel event for a channel from the kernel session. | |
111 | */ | |
112 | int event_kernel_disable_all(struct ltt_kernel_session *ksession, | |
113 | struct ltt_kernel_channel *kchan) | |
114 | { | |
115 | int ret; | |
116 | ||
117 | ret = event_kernel_disable_all_tracepoints(ksession, kchan); | |
118 | if (ret != LTTCOMM_OK) | |
119 | return ret; | |
120 | ret = event_kernel_disable_all_syscalls(ksession, kchan); | |
54d01ffb DG |
121 | return ret; |
122 | } | |
123 | ||
124 | /* | |
7a3d1328 | 125 | * Enable kernel tracepoint event for a channel from the kernel session. |
54d01ffb | 126 | */ |
7a3d1328 | 127 | int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession, |
54d01ffb DG |
128 | struct ltt_kernel_channel *kchan, struct lttng_event *event) |
129 | { | |
130 | int ret; | |
131 | struct ltt_kernel_event *kevent; | |
132 | ||
133 | kevent = trace_kernel_get_event_by_name(event->name, kchan); | |
134 | if (kevent == NULL) { | |
135 | ret = kernel_create_event(event, kchan); | |
136 | if (ret < 0) { | |
d87bfb32 DG |
137 | if (ret == -EEXIST) { |
138 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
139 | } else { | |
140 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
141 | } | |
7a3d1328 | 142 | goto end; |
54d01ffb DG |
143 | } |
144 | } else if (kevent->enabled == 0) { | |
145 | ret = kernel_enable_event(kevent); | |
146 | if (ret < 0) { | |
147 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7a3d1328 | 148 | goto end; |
54d01ffb DG |
149 | } |
150 | } | |
54d01ffb | 151 | ret = LTTCOMM_OK; |
7a3d1328 | 152 | end: |
54d01ffb DG |
153 | return ret; |
154 | } | |
155 | ||
156 | /* | |
7a3d1328 | 157 | * Enable all kernel tracepoint events of a channel of the kernel session. |
54d01ffb | 158 | */ |
7a3d1328 | 159 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession, |
54d01ffb DG |
160 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
161 | { | |
162 | int size, i, ret; | |
163 | struct ltt_kernel_event *kevent; | |
8f69e5eb | 164 | struct lttng_event *event_list = NULL; |
54d01ffb DG |
165 | |
166 | /* For each event in the kernel session */ | |
167 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
8f69e5eb DG |
168 | if (kevent->enabled == 0) { |
169 | ret = kernel_enable_event(kevent); | |
170 | if (ret < 0) { | |
171 | /* Enable failed but still continue */ | |
172 | continue; | |
173 | } | |
54d01ffb DG |
174 | } |
175 | } | |
176 | ||
177 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
178 | if (size < 0) { | |
179 | ret = LTTCOMM_KERN_LIST_FAIL; | |
7a3d1328 | 180 | goto end; |
54d01ffb DG |
181 | } |
182 | ||
183 | for (i = 0; i < size; i++) { | |
184 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); | |
185 | if (kevent == NULL) { | |
186 | /* Default event type for enable all */ | |
187 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
188 | /* Enable each single tracepoint event */ | |
189 | ret = kernel_create_event(&event_list[i], kchan); | |
190 | if (ret < 0) { | |
191 | /* Ignore error here and continue */ | |
192 | } | |
193 | } | |
194 | } | |
54d01ffb | 195 | free(event_list); |
8f69e5eb | 196 | |
54d01ffb | 197 | ret = LTTCOMM_OK; |
7a3d1328 | 198 | end: |
54d01ffb | 199 | return ret; |
7a3d1328 | 200 | |
54d01ffb | 201 | } |
8c9ae521 DG |
202 | |
203 | /* | |
7a3d1328 | 204 | * Enable all kernel tracepoint events of a channel of the kernel session. |
8c9ae521 | 205 | */ |
7a3d1328 | 206 | int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession, |
8c9ae521 DG |
207 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) |
208 | { | |
209 | int ret; | |
210 | struct lttng_event event; | |
211 | ||
212 | init_syscalls_kernel_event(&event); | |
213 | ||
214 | DBG("Enabling all syscall tracing"); | |
215 | ||
216 | ret = kernel_create_event(&event, kchan); | |
217 | if (ret < 0) { | |
8f69e5eb DG |
218 | if (ret == -EEXIST) { |
219 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
220 | } else { | |
221 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
222 | } | |
7a3d1328 | 223 | goto end; |
8c9ae521 | 224 | } |
8f69e5eb | 225 | |
8c9ae521 | 226 | ret = LTTCOMM_OK; |
7a3d1328 MD |
227 | end: |
228 | return ret; | |
229 | } | |
8c9ae521 | 230 | |
7a3d1328 MD |
231 | /* |
232 | * Enable all kernel events of a channel of the kernel session. | |
233 | */ | |
234 | int event_kernel_enable_all(struct ltt_kernel_session *ksession, | |
235 | struct ltt_kernel_channel *kchan, int kernel_tracer_fd) | |
236 | { | |
237 | int ret; | |
238 | ||
239 | ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd); | |
240 | if (ret != LTTCOMM_OK) { | |
241 | goto end; | |
242 | } | |
243 | ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd); | |
244 | end: | |
8c9ae521 DG |
245 | return ret; |
246 | } | |
2bdd86d4 | 247 | |
7f79d3a1 DG |
248 | /* |
249 | * ============================ | |
250 | * UST : The Ultimate Frontier! | |
251 | * ============================ | |
252 | */ | |
253 | ||
76d45b40 DG |
254 | /* |
255 | * Enable all UST tracepoints for a channel from a UST session. | |
256 | */ | |
257 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain, | |
258 | struct ltt_ust_channel *uchan) | |
259 | { | |
260 | int ret, i; | |
261 | size_t size; | |
262 | struct cds_lfht_iter iter; | |
263 | struct ltt_ust_event *uevent = NULL; | |
7f79d3a1 | 264 | struct lttng_event *events = NULL; |
76d45b40 DG |
265 | |
266 | switch (domain) { | |
267 | case LTTNG_DOMAIN_UST: | |
268 | { | |
269 | /* Enable existing events */ | |
270 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
271 | if (uevent->enabled == 0) { | |
272 | ret = ust_app_enable_event_glb(usess, uchan, uevent); | |
273 | if (ret < 0) { | |
274 | continue; | |
275 | } | |
276 | uevent->enabled = 1; | |
277 | } | |
278 | } | |
279 | ||
280 | /* Get all UST available events */ | |
281 | size = ust_app_list_events(&events); | |
282 | if (size < 0) { | |
283 | ret = LTTCOMM_UST_LIST_FAIL; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | for (i = 0; i < size; i++) { | |
288 | /* | |
289 | * Check if event exist and if so, continue since it was enable | |
290 | * previously. | |
291 | */ | |
292 | uevent = trace_ust_find_event_by_name(uchan->events, | |
293 | events[i].name); | |
294 | if (uevent != NULL) { | |
295 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
296 | events[i].pid); | |
297 | if (ret < 0) { | |
298 | if (ret != -EEXIST) { | |
299 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
300 | goto error; | |
301 | } | |
302 | } | |
303 | continue; | |
304 | } | |
305 | ||
306 | /* Create ust event */ | |
307 | uevent = trace_ust_create_event(&events[i]); | |
308 | if (uevent == NULL) { | |
309 | ret = LTTCOMM_FATAL; | |
7f79d3a1 | 310 | goto error_destroy; |
76d45b40 DG |
311 | } |
312 | ||
313 | /* Create event for the specific PID */ | |
314 | ret = ust_app_enable_event_pid(usess, uchan, uevent, | |
315 | events[i].pid); | |
316 | if (ret < 0) { | |
317 | if (ret == -EEXIST) { | |
318 | ret = LTTCOMM_UST_EVENT_EXIST; | |
7f79d3a1 | 319 | goto error; |
76d45b40 DG |
320 | } else { |
321 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
7f79d3a1 | 322 | goto error_destroy; |
76d45b40 | 323 | } |
76d45b40 DG |
324 | } |
325 | ||
326 | uevent->enabled = 1; | |
327 | /* Add ltt ust event to channel */ | |
328 | rcu_read_lock(); | |
329 | hashtable_add_unique(uchan->events, &uevent->node); | |
330 | rcu_read_unlock(); | |
331 | } | |
332 | ||
333 | free(events); | |
334 | break; | |
335 | } | |
336 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
337 | case LTTNG_DOMAIN_UST_PID: | |
338 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
339 | default: | |
340 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
341 | goto error; | |
342 | } | |
343 | ||
344 | return LTTCOMM_OK; | |
345 | ||
7f79d3a1 | 346 | error_destroy: |
76d45b40 | 347 | trace_ust_destroy_event(uevent); |
7f79d3a1 DG |
348 | |
349 | error: | |
350 | free(events); | |
76d45b40 DG |
351 | return ret; |
352 | } | |
353 | ||
2bdd86d4 MD |
354 | /* |
355 | * Enable UST tracepoint event for a channel from a UST session. | |
356 | */ | |
edb67388 DG |
357 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain, |
358 | struct ltt_ust_channel *uchan, struct lttng_event *event) | |
2bdd86d4 | 359 | { |
edb67388 DG |
360 | int ret, to_create = 0; |
361 | struct ltt_ust_event *uevent; | |
362 | ||
363 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); | |
364 | if (uevent == NULL) { | |
365 | uevent = trace_ust_create_event(event); | |
366 | if (uevent == NULL) { | |
367 | ret = LTTCOMM_FATAL; | |
368 | goto error; | |
369 | } | |
370 | to_create = 1; | |
371 | } | |
2bdd86d4 | 372 | |
7f79d3a1 DG |
373 | if (uevent->enabled) { |
374 | /* It's already enabled so everything is OK */ | |
7f79d3a1 DG |
375 | goto end; |
376 | } | |
377 | ||
edb67388 DG |
378 | switch (domain) { |
379 | case LTTNG_DOMAIN_UST: | |
380 | { | |
381 | if (to_create) { | |
382 | /* Create event on all UST registered apps for session */ | |
35a9059d | 383 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
edb67388 DG |
384 | } else { |
385 | /* Enable event on all UST registered apps for session */ | |
35a9059d | 386 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
edb67388 | 387 | } |
48842b30 | 388 | |
edb67388 DG |
389 | if (ret < 0) { |
390 | if (ret == -EEXIST) { | |
391 | ret = LTTCOMM_UST_EVENT_EXIST; | |
7f79d3a1 | 392 | goto end; |
edb67388 DG |
393 | } else { |
394 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
7f79d3a1 | 395 | goto error; |
edb67388 | 396 | } |
edb67388 | 397 | } |
edb67388 DG |
398 | break; |
399 | } | |
400 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
401 | case LTTNG_DOMAIN_UST_PID: | |
402 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
403 | default: | |
404 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
7f79d3a1 | 405 | goto end; |
2bdd86d4 | 406 | } |
48842b30 | 407 | |
48842b30 | 408 | uevent->enabled = 1; |
edb67388 | 409 | /* Add ltt ust event to channel */ |
7f79d3a1 DG |
410 | if (to_create) { |
411 | rcu_read_lock(); | |
412 | hashtable_add_unique(uchan->events, &uevent->node); | |
413 | rcu_read_unlock(); | |
414 | } | |
edb67388 | 415 | |
7f79d3a1 DG |
416 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
417 | to_create ? "created" : "enabled", uchan->name); | |
418 | ||
fb89d070 DG |
419 | end: |
420 | return LTTCOMM_OK; | |
edb67388 DG |
421 | |
422 | error: | |
423 | trace_ust_destroy_event(uevent); | |
2bdd86d4 MD |
424 | return ret; |
425 | } | |
426 | ||
7f79d3a1 DG |
427 | /* |
428 | * Disable UST tracepoint of a channel from a UST session. | |
429 | */ | |
430 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain, | |
431 | struct ltt_ust_channel *uchan, char *event_name) | |
2bdd86d4 MD |
432 | { |
433 | int ret; | |
7f79d3a1 | 434 | struct ltt_ust_event *uevent; |
2bdd86d4 | 435 | |
7f79d3a1 DG |
436 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
437 | if (uevent == NULL) { | |
438 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
439 | goto error; | |
2bdd86d4 | 440 | } |
7f79d3a1 DG |
441 | |
442 | if (uevent->enabled == 0) { | |
443 | /* It's already enabled so everything is OK */ | |
444 | ret = LTTCOMM_OK; | |
2bdd86d4 MD |
445 | goto end; |
446 | } | |
7f79d3a1 DG |
447 | |
448 | switch (domain) { | |
449 | case LTTNG_DOMAIN_UST: | |
450 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
451 | if (ret < 0 && ret != -EEXIST) { | |
452 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
453 | goto error; | |
454 | } | |
455 | break; | |
456 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
457 | case LTTNG_DOMAIN_UST_PID: | |
458 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
459 | default: | |
460 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
461 | goto error; | |
462 | } | |
463 | ||
464 | uevent->enabled = 0; | |
2bdd86d4 | 465 | ret = LTTCOMM_OK; |
7f79d3a1 | 466 | |
2bdd86d4 | 467 | end: |
7f79d3a1 DG |
468 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
469 | uchan->name); | |
470 | ||
471 | error: | |
472 | return ret; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Disable all UST tracepoints for a channel from a UST session. | |
477 | */ | |
478 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain, | |
479 | struct ltt_ust_channel *uchan) | |
480 | { | |
481 | int ret, i; | |
482 | size_t size; | |
483 | struct cds_lfht_iter iter; | |
484 | struct ltt_ust_event *uevent = NULL; | |
485 | struct lttng_event *events = NULL; | |
486 | ||
487 | switch (domain) { | |
488 | case LTTNG_DOMAIN_UST: | |
489 | { | |
490 | /* Disabling existing events */ | |
491 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
492 | if (uevent->enabled == 1) { | |
493 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
494 | if (ret < 0) { | |
495 | continue; | |
496 | } | |
497 | uevent->enabled = 0; | |
498 | } | |
499 | } | |
500 | ||
501 | /* Get all UST available events */ | |
502 | size = ust_app_list_events(&events); | |
503 | if (size < 0) { | |
504 | ret = LTTCOMM_UST_LIST_FAIL; | |
505 | goto error; | |
506 | } | |
507 | ||
508 | for (i = 0; i < size; i++) { | |
509 | uevent = trace_ust_find_event_by_name(uchan->events, | |
510 | events[i].name); | |
511 | if (uevent != NULL && uevent->enabled == 1) { | |
512 | ret = ust_app_disable_event_pid(usess, uchan, uevent, | |
513 | events[i].pid); | |
514 | if (ret < 0 && ret != -EEXIST) { | |
515 | ret = LTTCOMM_UST_DISABLE_FAIL; | |
516 | goto error; | |
517 | } | |
518 | uevent->enabled = 0; | |
519 | continue; | |
520 | } | |
521 | } | |
522 | ||
523 | free(events); | |
524 | break; | |
525 | } | |
526 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
527 | case LTTNG_DOMAIN_UST_PID: | |
528 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
529 | default: | |
530 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
531 | goto error; | |
532 | } | |
533 | ||
534 | return LTTCOMM_OK; | |
535 | ||
536 | error: | |
537 | free(events); | |
2bdd86d4 MD |
538 | return ret; |
539 | } |