Commit | Line | Data |
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b579acd9 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
1e307fab DG |
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. | |
b579acd9 | 7 | * |
1e307fab DG |
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. | |
b579acd9 | 12 | * |
1e307fab DG |
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. | |
b579acd9 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
54d01ffb | 23 | #include <urcu/list.h> |
1e307fab | 24 | |
db758600 | 25 | #include <common/error.h> |
10a8a223 | 26 | #include <common/sessiond-comm/sessiond-comm.h> |
b579acd9 | 27 | |
b579acd9 | 28 | #include "context.h" |
4771f025 | 29 | #include "kernel.h" |
55cc08a6 | 30 | #include "ust-app.h" |
34378f76 | 31 | #include "trace-ust.h" |
b579acd9 DG |
32 | |
33 | /* | |
34 | * Add kernel context to an event of a specific channel. | |
35 | */ | |
36 | static int add_kctx_to_event(struct lttng_kernel_context *kctx, | |
37 | struct ltt_kernel_channel *kchan, char *event_name) | |
38 | { | |
39 | int ret, found = 0; | |
40 | struct ltt_kernel_event *kevent; | |
41 | ||
42 | DBG("Add kernel context to event %s", event_name); | |
43 | ||
62499ad6 | 44 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
b579acd9 DG |
45 | if (kevent != NULL) { |
46 | ret = kernel_add_event_context(kevent, kctx); | |
47 | if (ret < 0) { | |
48 | goto error; | |
49 | } | |
50 | found = 1; | |
51 | } | |
52 | ||
53 | ret = found; | |
54 | ||
55 | error: | |
56 | return ret; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Add kernel context to all channel. | |
61 | * | |
62 | * If event_name is specified, add context to event instead. | |
63 | */ | |
64 | static int add_kctx_all_channels(struct ltt_kernel_session *ksession, | |
65 | struct lttng_kernel_context *kctx, char *event_name) | |
66 | { | |
67 | int ret, no_event = 0, found = 0; | |
68 | struct ltt_kernel_channel *kchan; | |
69 | ||
70 | if (strlen(event_name) == 0) { | |
71 | no_event = 1; | |
72 | } | |
73 | ||
74 | DBG("Adding kernel context to all channels (event: %s)", event_name); | |
75 | ||
76 | /* Go over all channels */ | |
77 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
78 | if (no_event) { | |
79 | ret = kernel_add_channel_context(kchan, kctx); | |
80 | if (ret < 0) { | |
81 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
82 | goto error; | |
83 | } | |
84 | } else { | |
85 | ret = add_kctx_to_event(kctx, kchan, event_name); | |
86 | if (ret < 0) { | |
87 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
88 | goto error; | |
89 | } else if (ret == 1) { | |
90 | /* Event found and context added */ | |
91 | found = 1; | |
92 | break; | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | if (!found && !no_event) { | |
98 | ret = LTTCOMM_NO_EVENT; | |
99 | goto error; | |
100 | } | |
101 | ||
102 | ret = LTTCOMM_OK; | |
103 | ||
104 | error: | |
105 | return ret; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Add kernel context to a specific channel. | |
110 | * | |
111 | * If event_name is specified, add context to that event. | |
112 | */ | |
113 | static int add_kctx_to_channel(struct lttng_kernel_context *kctx, | |
114 | struct ltt_kernel_channel *kchan, char *event_name) | |
115 | { | |
116 | int ret, no_event = 0, found = 0; | |
117 | ||
118 | if (strlen(event_name) == 0) { | |
119 | no_event = 1; | |
120 | } | |
121 | ||
122 | DBG("Add kernel context to channel '%s', event '%s'", | |
123 | kchan->channel->name, event_name); | |
124 | ||
125 | if (no_event) { | |
126 | ret = kernel_add_channel_context(kchan, kctx); | |
127 | if (ret < 0) { | |
128 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
129 | goto error; | |
130 | } | |
131 | } else { | |
132 | ret = add_kctx_to_event(kctx, kchan, event_name); | |
133 | if (ret < 0) { | |
134 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
135 | goto error; | |
136 | } else if (ret == 1) { | |
137 | /* Event found and context added */ | |
138 | found = 1; | |
139 | } | |
140 | } | |
141 | ||
142 | if (!found && !no_event) { | |
143 | ret = LTTCOMM_NO_EVENT; | |
144 | goto error; | |
145 | } | |
146 | ||
147 | ret = LTTCOMM_OK; | |
148 | ||
149 | error: | |
150 | return ret; | |
151 | } | |
152 | ||
6b79ed20 DG |
153 | /* |
154 | * Add UST context to channel. | |
155 | */ | |
156 | static int add_uctx_to_channel(struct ltt_ust_session *usess, int domain, | |
157 | struct ltt_ust_channel *uchan, struct lttng_event_context *ctx) | |
158 | { | |
159 | int ret; | |
160 | struct ltt_ust_context *uctx; | |
161 | ||
162 | /* Create ltt UST context */ | |
163 | uctx = trace_ust_create_context(ctx); | |
164 | if (uctx == NULL) { | |
165 | ret = LTTCOMM_FATAL; | |
166 | goto error; | |
167 | } | |
168 | ||
169 | switch (domain) { | |
170 | case LTTNG_DOMAIN_UST: | |
171 | ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx); | |
172 | if (ret < 0) { | |
173 | goto error; | |
174 | } | |
175 | break; | |
176 | default: | |
177 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
178 | goto error; | |
179 | } | |
180 | ||
181 | /* Add ltt UST context node to ltt UST channel */ | |
bec39940 | 182 | lttng_ht_add_unique_ulong(uchan->ctx, &uctx->node); |
6b79ed20 DG |
183 | |
184 | return LTTCOMM_OK; | |
185 | ||
186 | error: | |
187 | free(uctx); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Add UST context to event. | |
193 | */ | |
194 | static int add_uctx_to_event(struct ltt_ust_session *usess, int domain, | |
195 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, | |
196 | struct lttng_event_context *ctx) | |
197 | { | |
198 | int ret; | |
199 | struct ltt_ust_context *uctx; | |
200 | ||
201 | /* Create ltt UST context */ | |
202 | uctx = trace_ust_create_context(ctx); | |
203 | if (uctx == NULL) { | |
204 | ret = LTTCOMM_FATAL; | |
205 | goto error; | |
206 | } | |
207 | ||
208 | switch (domain) { | |
209 | case LTTNG_DOMAIN_UST: | |
210 | ret = ust_app_add_ctx_event_glb(usess, uchan, uevent, uctx); | |
211 | if (ret < 0) { | |
212 | goto error; | |
213 | } | |
214 | break; | |
215 | default: | |
216 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
217 | goto error; | |
218 | } | |
219 | ||
220 | /* Add ltt UST context node to ltt UST event */ | |
bec39940 | 221 | lttng_ht_add_unique_ulong(uevent->ctx, &uctx->node); |
6b79ed20 DG |
222 | |
223 | return LTTCOMM_OK; | |
224 | ||
225 | error: | |
226 | free(uctx); | |
227 | return ret; | |
228 | } | |
229 | ||
b579acd9 DG |
230 | /* |
231 | * Add kernel context to tracer. | |
232 | */ | |
54d01ffb DG |
233 | int context_kernel_add(struct ltt_kernel_session *ksession, |
234 | struct lttng_event_context *ctx, char *event_name, | |
b579acd9 DG |
235 | char *channel_name) |
236 | { | |
237 | int ret; | |
238 | struct ltt_kernel_channel *kchan; | |
54d01ffb DG |
239 | struct lttng_kernel_context kctx; |
240 | ||
241 | /* Setup kernel context structure */ | |
242 | kctx.ctx = ctx->ctx; | |
243 | kctx.u.perf_counter.type = ctx->u.perf_counter.type; | |
244 | kctx.u.perf_counter.config = ctx->u.perf_counter.config; | |
245 | strncpy(kctx.u.perf_counter.name, ctx->u.perf_counter.name, | |
246 | LTTNG_SYMBOL_NAME_LEN); | |
247 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
b579acd9 DG |
248 | |
249 | if (strlen(channel_name) == 0) { | |
54d01ffb | 250 | ret = add_kctx_all_channels(ksession, &kctx, event_name); |
b579acd9 DG |
251 | if (ret != LTTCOMM_OK) { |
252 | goto error; | |
253 | } | |
254 | } else { | |
255 | /* Get kernel channel */ | |
62499ad6 | 256 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
b579acd9 DG |
257 | if (kchan == NULL) { |
258 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
259 | goto error; | |
260 | } | |
261 | ||
54d01ffb | 262 | ret = add_kctx_to_channel(&kctx, kchan, event_name); |
b579acd9 DG |
263 | if (ret != LTTCOMM_OK) { |
264 | goto error; | |
265 | } | |
266 | } | |
267 | ||
268 | ret = LTTCOMM_OK; | |
269 | ||
270 | error: | |
271 | return ret; | |
272 | } | |
2bdd86d4 MD |
273 | |
274 | /* | |
55cc08a6 | 275 | * Add UST context to tracer. |
2bdd86d4 | 276 | */ |
55cc08a6 DG |
277 | int context_ust_add(struct ltt_ust_session *usess, int domain, |
278 | struct lttng_event_context *ctx, char *event_name, | |
279 | char *channel_name) | |
2bdd86d4 | 280 | { |
55cc08a6 | 281 | int ret = LTTCOMM_OK, have_event = 0; |
bec39940 DG |
282 | struct lttng_ht_iter iter, uiter; |
283 | struct lttng_ht *chan_ht; | |
55cc08a6 DG |
284 | struct ltt_ust_channel *uchan = NULL; |
285 | struct ltt_ust_event *uevent = NULL; | |
2bdd86d4 | 286 | |
6b79ed20 DG |
287 | /* |
288 | * Define which channel's hashtable to use from the domain or quit if | |
289 | * unknown domain. | |
290 | */ | |
55cc08a6 DG |
291 | switch (domain) { |
292 | case LTTNG_DOMAIN_UST: | |
293 | chan_ht = usess->domain_global.channels; | |
294 | break; | |
295 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
296 | case LTTNG_DOMAIN_UST_PID: | |
297 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
298 | default: | |
299 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2bdd86d4 MD |
300 | goto error; |
301 | } | |
2bdd86d4 | 302 | |
6b79ed20 | 303 | /* Do we have an event name */ |
55cc08a6 DG |
304 | if (strlen(event_name) != 0) { |
305 | have_event = 1; | |
2bdd86d4 MD |
306 | } |
307 | ||
55cc08a6 DG |
308 | /* Get UST channel if defined */ |
309 | if (strlen(channel_name) != 0) { | |
310 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
311 | if (uchan == NULL) { | |
312 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2bdd86d4 MD |
313 | goto error; |
314 | } | |
55cc08a6 DG |
315 | } |
316 | ||
317 | /* If UST channel specified and event name, get UST event ref */ | |
318 | if (uchan && have_event) { | |
319 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); | |
320 | if (uevent == NULL) { | |
321 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
2bdd86d4 | 322 | goto error; |
2bdd86d4 MD |
323 | } |
324 | } | |
325 | ||
55cc08a6 DG |
326 | /* At this point, we have 4 possibilities */ |
327 | ||
6b79ed20 DG |
328 | if (uchan && uevent) { /* Add ctx to event in channel */ |
329 | ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx); | |
55cc08a6 | 330 | } else if (uchan && !have_event) { /* Add ctx to channel */ |
6b79ed20 | 331 | ret = add_uctx_to_channel(usess, domain, uchan, ctx); |
55cc08a6 | 332 | } else if (!uchan && have_event) { /* Add ctx to event */ |
6b79ed20 | 333 | /* Add context to event without having the channel name */ |
bec39940 | 334 | cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) { |
55cc08a6 DG |
335 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
336 | if (uevent != NULL) { | |
6b79ed20 | 337 | ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx); |
55cc08a6 DG |
338 | /* |
339 | * LTTng UST does not allowed the same event to be registered | |
340 | * multiple time in different or the same channel. So, if we | |
6b79ed20 | 341 | * found our event, we stop. |
55cc08a6 DG |
342 | */ |
343 | goto end; | |
344 | } | |
2bdd86d4 | 345 | } |
55cc08a6 | 346 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; |
6b79ed20 DG |
347 | goto error; |
348 | } else if (!uchan && !have_event) { /* Add ctx all events, all channels */ | |
349 | /* For all channels */ | |
bec39940 | 350 | cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) { |
6b79ed20 | 351 | ret = add_uctx_to_channel(usess, domain, uchan, ctx); |
55cc08a6 | 352 | if (ret < 0) { |
6b79ed20 | 353 | ERR("Context added to channel %s failed", uchan->name); |
55cc08a6 DG |
354 | continue; |
355 | } | |
6b79ed20 DG |
356 | |
357 | /* For all events in channel */ | |
bec39940 DG |
358 | cds_lfht_for_each_entry(uchan->events->ht, &uiter.iter, uevent, |
359 | node.node) { | |
6b79ed20 | 360 | ret = add_uctx_to_event(usess, domain, uchan, uevent, ctx); |
55cc08a6 | 361 | if (ret < 0) { |
6b79ed20 DG |
362 | ERR("Context add to event %s in channel %s failed", |
363 | uevent->attr.name, uchan->name); | |
55cc08a6 DG |
364 | continue; |
365 | } | |
55cc08a6 | 366 | } |
2bdd86d4 | 367 | } |
55cc08a6 | 368 | } |
2bdd86d4 | 369 | |
55cc08a6 DG |
370 | end: |
371 | switch (ret) { | |
372 | case -EEXIST: | |
373 | ret = LTTCOMM_UST_CONTEXT_EXIST; | |
6b79ed20 | 374 | goto error; |
55cc08a6 DG |
375 | case -ENOMEM: |
376 | ret = LTTCOMM_FATAL; | |
6b79ed20 | 377 | goto error; |
2bdd86d4 MD |
378 | } |
379 | ||
55cc08a6 | 380 | return LTTCOMM_OK; |
2bdd86d4 MD |
381 | |
382 | error: | |
383 | return ret; | |
384 | } |