Commit | Line | Data |
---|---|---|
ce5aef0b MD |
1 | /* |
2 | * ltt-probes.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * Holds LTTng probes registry. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
8d8a24c8 MD |
11 | #include <string.h> |
12 | #include <errno.h> | |
13 | #include <urcu/list.h> | |
1f18504e | 14 | #include <urcu/hlist.h> |
4318ae1b | 15 | #include <lttng/ust-events.h> |
a3bb4b27 | 16 | #include <assert.h> |
c8fcf224 | 17 | #include <helper.h> |
48740cab | 18 | #include <ctype.h> |
ce5aef0b | 19 | |
8165c8da | 20 | #include "ltt-tracer-core.h" |
1f18504e MD |
21 | #include "jhash.h" |
22 | #include "error.h" | |
8165c8da MD |
23 | |
24 | /* | |
17dfb34b | 25 | * probe list is protected by ust_lock()/ust_unlock(). |
8165c8da | 26 | */ |
8d8a24c8 | 27 | static CDS_LIST_HEAD(probe_list); |
ce5aef0b | 28 | |
1f18504e MD |
29 | /* |
30 | * Loglevel hash table, containing the active loglevels. | |
31 | * Protected by ust lock. | |
32 | */ | |
33 | #define LOGLEVEL_HASH_BITS 6 | |
34 | #define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS) | |
35 | static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE]; | |
36 | ||
e6c12e3d MD |
37 | /* |
38 | * Wildcard list, containing the active wildcards. | |
39 | * Protected by ust lock. | |
40 | */ | |
41 | static CDS_LIST_HEAD(wildcard_list); | |
42 | ||
df854e41 MD |
43 | static |
44 | const struct lttng_probe_desc *find_provider(const char *provider) | |
45 | { | |
46 | struct lttng_probe_desc *iter; | |
47 | ||
48 | cds_list_for_each_entry(iter, &probe_list, head) { | |
49 | if (!strcmp(iter->provider, provider)) | |
50 | return iter; | |
51 | } | |
52 | return NULL; | |
53 | } | |
54 | ||
ce5aef0b MD |
55 | static |
56 | const struct lttng_event_desc *find_event(const char *name) | |
57 | { | |
58 | struct lttng_probe_desc *probe_desc; | |
59 | int i; | |
60 | ||
8d8a24c8 | 61 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
ce5aef0b | 62 | for (i = 0; i < probe_desc->nr_events; i++) { |
ff412fb5 MD |
63 | if (!strncmp(probe_desc->event_desc[i]->name, name, |
64 | LTTNG_UST_SYM_NAME_LEN - 1)) | |
df854e41 | 65 | return probe_desc->event_desc[i]; |
ce5aef0b MD |
66 | } |
67 | } | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | int ltt_probe_register(struct lttng_probe_desc *desc) | |
72 | { | |
df854e41 | 73 | struct lttng_probe_desc *iter; |
ce5aef0b MD |
74 | int ret = 0; |
75 | int i; | |
76 | ||
17dfb34b | 77 | ust_lock(); |
df854e41 MD |
78 | if (find_provider(desc->provider)) { |
79 | ret = -EEXIST; | |
80 | goto end; | |
81 | } | |
ce5aef0b MD |
82 | /* |
83 | * TODO: This is O(N^2). Turn into a hash table when probe registration | |
84 | * overhead becomes an issue. | |
85 | */ | |
86 | for (i = 0; i < desc->nr_events; i++) { | |
df854e41 | 87 | if (find_event(desc->event_desc[i]->name)) { |
ce5aef0b MD |
88 | ret = -EEXIST; |
89 | goto end; | |
90 | } | |
91 | } | |
df854e41 MD |
92 | |
93 | /* | |
94 | * We sort the providers by struct lttng_probe_desc pointer | |
95 | * address. | |
96 | */ | |
97 | cds_list_for_each_entry_reverse(iter, &probe_list, head) { | |
98 | BUG_ON(iter == desc); /* Should never be in the list twice */ | |
99 | if (iter < desc) { | |
100 | /* We belong to the location right after iter. */ | |
101 | cds_list_add(&desc->head, &iter->head); | |
102 | goto desc_added; | |
103 | } | |
104 | } | |
105 | /* We should be added at the head of the list */ | |
8d8a24c8 | 106 | cds_list_add(&desc->head, &probe_list); |
df854e41 | 107 | desc_added: |
8165c8da MD |
108 | |
109 | /* | |
110 | * fix the events awaiting probe load. | |
111 | */ | |
112 | for (i = 0; i < desc->nr_events; i++) { | |
df854e41 | 113 | ret = pending_probe_fix_events(desc->event_desc[i]); |
8165c8da MD |
114 | assert(!ret); |
115 | } | |
ce5aef0b | 116 | end: |
17dfb34b | 117 | ust_unlock(); |
ce5aef0b MD |
118 | return ret; |
119 | } | |
ce5aef0b MD |
120 | |
121 | void ltt_probe_unregister(struct lttng_probe_desc *desc) | |
122 | { | |
17dfb34b | 123 | ust_lock(); |
8d8a24c8 | 124 | cds_list_del(&desc->head); |
17dfb34b | 125 | ust_unlock(); |
ce5aef0b | 126 | } |
ce5aef0b | 127 | |
8165c8da MD |
128 | /* |
129 | * called with UST lock held. | |
130 | */ | |
ce5aef0b MD |
131 | const struct lttng_event_desc *ltt_event_get(const char *name) |
132 | { | |
133 | const struct lttng_event_desc *event; | |
ce5aef0b | 134 | |
ce5aef0b | 135 | event = find_event(name); |
ce5aef0b MD |
136 | if (!event) |
137 | return NULL; | |
ce5aef0b MD |
138 | return event; |
139 | } | |
ce5aef0b MD |
140 | |
141 | void ltt_event_put(const struct lttng_event_desc *event) | |
142 | { | |
ce5aef0b | 143 | } |
c8fcf224 MD |
144 | |
145 | void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list) | |
146 | { | |
147 | struct tp_list_entry *list_entry, *tmp; | |
148 | ||
149 | cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) { | |
150 | cds_list_del(&list_entry->head); | |
151 | free(list_entry); | |
152 | } | |
153 | } | |
154 | ||
155 | /* | |
156 | * called with UST lock held. | |
157 | */ | |
158 | int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list) | |
159 | { | |
160 | struct lttng_probe_desc *probe_desc; | |
161 | int i; | |
162 | ||
163 | CDS_INIT_LIST_HEAD(&list->head); | |
164 | cds_list_for_each_entry(probe_desc, &probe_list, head) { | |
165 | for (i = 0; i < probe_desc->nr_events; i++) { | |
166 | struct tp_list_entry *list_entry; | |
167 | ||
168 | list_entry = zmalloc(sizeof(*list_entry)); | |
169 | if (!list_entry) | |
170 | goto err_nomem; | |
171 | cds_list_add(&list_entry->head, &list->head); | |
172 | strncpy(list_entry->tp.name, | |
173 | probe_desc->event_desc[i]->name, | |
174 | LTTNG_UST_SYM_NAME_LEN); | |
175 | list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
176 | if (!probe_desc->event_desc[i]->loglevel) { | |
177 | list_entry->tp.loglevel[0] = '\0'; | |
178 | list_entry->tp.loglevel_value = 0; | |
179 | } else { | |
180 | strncpy(list_entry->tp.loglevel, | |
181 | (*probe_desc->event_desc[i]->loglevel)->identifier, | |
182 | LTTNG_UST_SYM_NAME_LEN); | |
183 | list_entry->tp.loglevel[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; | |
184 | list_entry->tp.loglevel_value = | |
185 | (*probe_desc->event_desc[i]->loglevel)->value; | |
186 | } | |
187 | } | |
188 | } | |
189 | if (cds_list_empty(&list->head)) | |
190 | list->iter = NULL; | |
191 | else | |
192 | list->iter = | |
193 | cds_list_first_entry(&list->head, struct tp_list_entry, head); | |
194 | return 0; | |
195 | ||
196 | err_nomem: | |
197 | ltt_probes_prune_event_list(list); | |
198 | return -ENOMEM; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Return current iteration position, advance internal iterator to next. | |
203 | * Return NULL if end of list. | |
204 | */ | |
205 | struct lttng_ust_tracepoint_iter * | |
206 | lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list) | |
207 | { | |
208 | struct tp_list_entry *entry; | |
209 | ||
210 | if (!list->iter) | |
211 | return NULL; | |
212 | entry = list->iter; | |
213 | if (entry->head.next == &list->head) | |
214 | list->iter = NULL; | |
215 | else | |
216 | list->iter = cds_list_entry(entry->head.next, | |
217 | struct tp_list_entry, head); | |
218 | return &entry->tp; | |
219 | } | |
1f18504e MD |
220 | |
221 | /* | |
222 | * Get loglevel if the loglevel is present in the loglevel hash table. | |
223 | * Must be called with ust lock held. | |
224 | * Returns NULL if not present. | |
225 | */ | |
226 | struct loglevel_entry *get_loglevel(const char *name) | |
227 | { | |
228 | struct cds_hlist_head *head; | |
229 | struct cds_hlist_node *node; | |
230 | struct loglevel_entry *e; | |
ff412fb5 MD |
231 | size_t name_len = strlen(name); |
232 | uint32_t hash; | |
1f18504e | 233 | |
ff412fb5 MD |
234 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
235 | WARN("Truncating loglevel name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
236 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
237 | } | |
238 | hash = jhash(name, name_len, 0); | |
1f18504e MD |
239 | head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)]; |
240 | cds_hlist_for_each_entry(e, node, head, hlist) { | |
ff412fb5 | 241 | if (!strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) |
1f18504e MD |
242 | return e; |
243 | } | |
244 | return NULL; | |
245 | } | |
246 | ||
48740cab MD |
247 | struct loglevel_entry *get_loglevel_value(int64_t value) |
248 | { | |
249 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
250 | int ret; | |
251 | ||
252 | ret = snprintf(name, LTTNG_UST_SYM_NAME_LEN, "%lld", (long long) value); | |
253 | if (ret < 0) | |
254 | return NULL; | |
255 | return get_loglevel(name); | |
256 | } | |
257 | ||
1f18504e MD |
258 | /* |
259 | * marshall all probes/all events and create those that fit the | |
260 | * loglevel. Add them to the events list as created. | |
261 | */ | |
262 | static | |
574a6217 MD |
263 | void _probes_create_loglevel_events(struct loglevel_entry *entry, |
264 | struct session_loglevel *loglevel) | |
1f18504e MD |
265 | { |
266 | struct lttng_probe_desc *probe_desc; | |
7ee3cc56 | 267 | struct lttng_ust_event event_param; |
1f18504e MD |
268 | int i; |
269 | ||
270 | cds_list_for_each_entry(probe_desc, &probe_list, head) { | |
271 | for (i = 0; i < probe_desc->nr_events; i++) { | |
272 | const struct tracepoint_loglevel_entry *ev_ll; | |
7ee3cc56 | 273 | const struct lttng_event_desc *event_desc; |
5e87eb4a | 274 | int match = 0; |
1f18504e | 275 | |
7ee3cc56 MD |
276 | event_desc = probe_desc->event_desc[i]; |
277 | if (!(event_desc->loglevel)) | |
1f18504e | 278 | continue; |
7ee3cc56 | 279 | ev_ll = *event_desc->loglevel; |
3431ca3e | 280 | if (isdigit(entry->name[0])) { |
48740cab MD |
281 | if (atoll(entry->name) == ev_ll->value) { |
282 | match = 1; | |
283 | } | |
ff412fb5 MD |
284 | } else if (!strncmp(ev_ll->identifier, entry->name, |
285 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
48740cab MD |
286 | match = 1; |
287 | } | |
288 | ||
289 | if (match) { | |
1f18504e MD |
290 | struct ltt_event *ev; |
291 | int ret; | |
292 | ||
7ee3cc56 MD |
293 | memcpy(&event_param, &loglevel->event_param, |
294 | sizeof(event_param)); | |
295 | memcpy(event_param.name, | |
296 | event_desc->name, | |
297 | sizeof(event_param.name)); | |
1f18504e MD |
298 | /* create event */ |
299 | ret = ltt_event_create(loglevel->chan, | |
7ee3cc56 | 300 | &event_param, NULL, |
1f18504e | 301 | &ev); |
7ee3cc56 MD |
302 | if (ret) { |
303 | DBG("Error creating event"); | |
1f18504e | 304 | continue; |
7ee3cc56 | 305 | } |
1f18504e MD |
306 | cds_list_add(&ev->loglevel_list, |
307 | &loglevel->events); | |
308 | } | |
1f18504e MD |
309 | } |
310 | } | |
311 | } | |
312 | ||
313 | /* | |
314 | * Add the loglevel to the loglevel hash table. Must be called with | |
315 | * ust lock held. | |
316 | */ | |
574a6217 | 317 | struct session_loglevel *add_loglevel(const char *name, |
1f18504e MD |
318 | struct ltt_channel *chan, |
319 | struct lttng_ust_event *event_param) | |
320 | { | |
321 | struct cds_hlist_head *head; | |
322 | struct cds_hlist_node *node; | |
323 | struct loglevel_entry *e; | |
574a6217 | 324 | struct session_loglevel *sl; |
574a6217 | 325 | int found = 0; |
ff412fb5 MD |
326 | size_t name_len = strlen(name); |
327 | uint32_t hash; | |
1f18504e | 328 | |
ff412fb5 MD |
329 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
330 | WARN("Truncating loglevel name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
331 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
332 | } | |
333 | hash = jhash(name, name_len, 0); | |
574a6217 | 334 | /* loglevel entry */ |
1f18504e MD |
335 | head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)]; |
336 | cds_hlist_for_each_entry(e, node, head, hlist) { | |
ff412fb5 | 337 | if (!strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { |
574a6217 MD |
338 | found = 1; |
339 | break; | |
340 | } | |
341 | } | |
342 | ||
343 | if (!found) { | |
344 | /* | |
345 | * Using zmalloc here to allocate a variable length element. Could | |
346 | * cause some memory fragmentation if overused. | |
347 | */ | |
ff412fb5 | 348 | e = zmalloc(sizeof(struct loglevel_entry) + name_len + 1); |
574a6217 MD |
349 | if (!e) |
350 | return ERR_PTR(-ENOMEM); | |
ff412fb5 MD |
351 | memcpy(&e->name[0], name, name_len + 1); |
352 | e->name[name_len] = '\0'; | |
574a6217 | 353 | cds_hlist_add_head(&e->hlist, head); |
d5201d38 | 354 | CDS_INIT_LIST_HEAD(&e->session_list); |
574a6217 MD |
355 | } |
356 | ||
357 | /* session loglevel */ | |
358 | cds_list_for_each_entry(sl, &e->session_list, session_list) { | |
359 | if (chan == sl->chan) { | |
360 | DBG("loglevel %s busy for this channel", name); | |
1f18504e MD |
361 | return ERR_PTR(-EEXIST); /* Already there */ |
362 | } | |
363 | } | |
574a6217 MD |
364 | sl = zmalloc(sizeof(struct session_loglevel)); |
365 | if (!sl) | |
1f18504e | 366 | return ERR_PTR(-ENOMEM); |
574a6217 MD |
367 | sl->chan = chan; |
368 | sl->enabled = 1; | |
369 | memcpy(&sl->event_param, event_param, sizeof(sl->event_param)); | |
d5201d38 | 370 | sl->event_param.instrumentation = LTTNG_UST_TRACEPOINT; |
574a6217 MD |
371 | CDS_INIT_LIST_HEAD(&sl->events); |
372 | cds_list_add(&sl->list, &chan->session->loglevels); | |
373 | cds_list_add(&sl->session_list, &e->session_list); | |
2981744d | 374 | sl->entry = e; |
574a6217 MD |
375 | _probes_create_loglevel_events(e, sl); |
376 | return sl; | |
1f18504e MD |
377 | } |
378 | ||
379 | /* | |
380 | * Remove the loglevel from the loglevel hash table. Must be called with | |
381 | * ust_lock held. Only called at session teardown. | |
382 | */ | |
574a6217 | 383 | void _remove_loglevel(struct session_loglevel *loglevel) |
1f18504e MD |
384 | { |
385 | struct ltt_event *ev, *tmp; | |
386 | ||
387 | /* | |
388 | * Just remove the events owned (for enable/disable) by this | |
389 | * loglevel from the list. The session teardown will take care | |
390 | * of freeing the event memory. | |
391 | */ | |
66221151 MD |
392 | cds_list_for_each_entry_safe(ev, tmp, &loglevel->events, |
393 | loglevel_list) { | |
394 | cds_list_del(&ev->loglevel_list); | |
1f18504e | 395 | } |
574a6217 | 396 | cds_list_del(&loglevel->session_list); |
1f18504e | 397 | cds_list_del(&loglevel->list); |
574a6217 MD |
398 | if (cds_list_empty(&loglevel->entry->session_list)) { |
399 | cds_hlist_del(&loglevel->entry->hlist); | |
400 | free(loglevel->entry); | |
401 | } | |
1f18504e MD |
402 | free(loglevel); |
403 | } | |
404 | ||
574a6217 | 405 | int ltt_loglevel_enable(struct session_loglevel *loglevel) |
1f18504e MD |
406 | { |
407 | struct ltt_event *ev; | |
408 | int ret; | |
409 | ||
410 | if (loglevel->enabled) | |
411 | return -EEXIST; | |
66221151 | 412 | cds_list_for_each_entry(ev, &loglevel->events, loglevel_list) { |
1f18504e MD |
413 | ret = ltt_event_enable(ev); |
414 | if (ret) { | |
415 | DBG("Error: enable error.\n"); | |
416 | return ret; | |
417 | } | |
418 | } | |
419 | loglevel->enabled = 1; | |
420 | return 0; | |
421 | } | |
422 | ||
574a6217 | 423 | int ltt_loglevel_disable(struct session_loglevel *loglevel) |
1f18504e MD |
424 | { |
425 | struct ltt_event *ev; | |
426 | int ret; | |
427 | ||
428 | if (!loglevel->enabled) | |
429 | return -EEXIST; | |
66221151 | 430 | cds_list_for_each_entry(ev, &loglevel->events, loglevel_list) { |
1f18504e MD |
431 | ret = ltt_event_disable(ev); |
432 | if (ret) { | |
433 | DBG("Error: disable error.\n"); | |
434 | return ret; | |
435 | } | |
436 | } | |
437 | loglevel->enabled = 0; | |
438 | return 0; | |
439 | } | |
e6c12e3d MD |
440 | |
441 | /* WILDCARDS */ | |
442 | ||
443 | /* | |
444 | * Return wildcard for a given event name if the event name match the | |
445 | * one of the wildcards. | |
446 | * Must be called with ust lock held. | |
447 | * Returns NULL if not present. | |
448 | */ | |
449 | struct wildcard_entry *match_wildcard(const char *name) | |
450 | { | |
451 | struct wildcard_entry *e; | |
452 | ||
453 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
454 | /* If only contain '*' */ | |
455 | if (strlen(e->name) == 1) | |
456 | return e; | |
457 | /* Compare excluding final '*' */ | |
458 | if (!strncmp(name, e->name, strlen(e->name) - 1)) | |
459 | return e; | |
460 | } | |
461 | return NULL; | |
462 | } | |
463 | ||
464 | /* | |
465 | * marshall all probes/all events and create those that fit the | |
466 | * wildcard. Add them to the events list as created. | |
467 | */ | |
468 | static | |
469 | void _probes_create_wildcard_events(struct wildcard_entry *entry, | |
470 | struct session_wildcard *wildcard) | |
471 | { | |
472 | struct lttng_probe_desc *probe_desc; | |
473 | struct lttng_ust_event event_param; | |
474 | int i; | |
475 | ||
476 | cds_list_for_each_entry(probe_desc, &probe_list, head) { | |
477 | for (i = 0; i < probe_desc->nr_events; i++) { | |
478 | const struct lttng_event_desc *event_desc; | |
479 | int match = 0; | |
480 | ||
481 | event_desc = probe_desc->event_desc[i]; | |
482 | /* compare excluding final '*' */ | |
483 | assert(strlen(entry->name) > 0); | |
484 | if (strcmp(event_desc->name, "lttng_ust:metadata") | |
485 | && (strlen(entry->name) == 1 | |
486 | || !strncmp(event_desc->name, entry->name, | |
487 | strlen(entry->name) - 1))) { | |
488 | match = 1; | |
489 | } | |
490 | if (match) { | |
491 | struct ltt_event *ev; | |
492 | int ret; | |
493 | ||
494 | memcpy(&event_param, &wildcard->event_param, | |
495 | sizeof(event_param)); | |
496 | memcpy(event_param.name, | |
497 | event_desc->name, | |
498 | sizeof(event_param.name)); | |
499 | /* create event */ | |
500 | ret = ltt_event_create(wildcard->chan, | |
501 | &event_param, NULL, | |
502 | &ev); | |
503 | if (ret) { | |
504 | DBG("Error creating event"); | |
505 | continue; | |
506 | } | |
507 | cds_list_add(&ev->wildcard_list, | |
508 | &wildcard->events); | |
509 | } | |
510 | } | |
511 | } | |
512 | } | |
513 | ||
514 | /* | |
515 | * Add the wildcard to the wildcard hash table. Must be called with | |
516 | * ust lock held. | |
517 | */ | |
518 | struct session_wildcard *add_wildcard(const char *name, | |
519 | struct ltt_channel *chan, | |
520 | struct lttng_ust_event *event_param) | |
521 | { | |
522 | struct wildcard_entry *e; | |
523 | struct session_wildcard *sw; | |
524 | size_t name_len = strlen(name) + 1; | |
525 | int found = 0; | |
526 | ||
527 | /* wildcard entry */ | |
528 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
ff412fb5 | 529 | if (!strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { |
e6c12e3d MD |
530 | found = 1; |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
535 | if (!found) { | |
536 | /* | |
537 | * Using zmalloc here to allocate a variable length element. Could | |
538 | * cause some memory fragmentation if overused. | |
539 | */ | |
540 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
541 | if (!e) | |
542 | return ERR_PTR(-ENOMEM); | |
543 | memcpy(&e->name[0], name, name_len); | |
544 | cds_list_add(&e->list, &wildcard_list); | |
545 | CDS_INIT_LIST_HEAD(&e->session_list); | |
546 | } | |
547 | ||
548 | /* session wildcard */ | |
549 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
550 | if (chan == sw->chan) { | |
551 | DBG("wildcard %s busy for this channel", name); | |
552 | return ERR_PTR(-EEXIST); /* Already there */ | |
553 | } | |
554 | } | |
555 | sw = zmalloc(sizeof(struct session_wildcard)); | |
556 | if (!sw) | |
557 | return ERR_PTR(-ENOMEM); | |
558 | sw->chan = chan; | |
559 | sw->enabled = 1; | |
560 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
561 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
562 | CDS_INIT_LIST_HEAD(&sw->events); | |
563 | cds_list_add(&sw->list, &chan->session->wildcards); | |
564 | cds_list_add(&sw->session_list, &e->session_list); | |
565 | sw->entry = e; | |
566 | _probes_create_wildcard_events(e, sw); | |
567 | return sw; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Remove the wildcard from the wildcard hash table. Must be called with | |
572 | * ust_lock held. Only called at session teardown. | |
573 | */ | |
574 | void _remove_wildcard(struct session_wildcard *wildcard) | |
575 | { | |
576 | struct ltt_event *ev, *tmp; | |
577 | ||
578 | /* | |
579 | * Just remove the events owned (for enable/disable) by this | |
580 | * wildcard from the list. The session teardown will take care | |
581 | * of freeing the event memory. | |
582 | */ | |
66221151 MD |
583 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, |
584 | wildcard_list) { | |
585 | cds_list_del(&ev->wildcard_list); | |
e6c12e3d MD |
586 | } |
587 | cds_list_del(&wildcard->session_list); | |
588 | cds_list_del(&wildcard->list); | |
589 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
590 | cds_list_del(&wildcard->entry->list); | |
591 | free(wildcard->entry); | |
592 | } | |
593 | free(wildcard); | |
594 | } | |
595 | ||
596 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
597 | { | |
598 | struct ltt_event *ev; | |
599 | int ret; | |
600 | ||
601 | if (wildcard->enabled) | |
602 | return -EEXIST; | |
66221151 | 603 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { |
e6c12e3d MD |
604 | ret = ltt_event_enable(ev); |
605 | if (ret) { | |
606 | DBG("Error: enable error.\n"); | |
607 | return ret; | |
608 | } | |
609 | } | |
610 | wildcard->enabled = 1; | |
611 | return 0; | |
612 | } | |
613 | ||
614 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
615 | { | |
616 | struct ltt_event *ev; | |
617 | int ret; | |
618 | ||
619 | if (!wildcard->enabled) | |
620 | return -EEXIST; | |
66221151 | 621 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { |
e6c12e3d MD |
622 | ret = ltt_event_disable(ev); |
623 | if (ret) { | |
624 | DBG("Error: disable error.\n"); | |
625 | return ret; | |
626 | } | |
627 | } | |
628 | wildcard->enabled = 0; | |
629 | return 0; | |
630 | } |