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 DG |
24 | |
25 | #include <lttng-sessiond-comm.h> | |
54d01ffb | 26 | #include <lttngerr.h> |
b579acd9 | 27 | |
b579acd9 | 28 | #include "context.h" |
48842b30 | 29 | #include "hashtable.h" |
4771f025 | 30 | #include "kernel.h" |
55cc08a6 | 31 | #include "ust-app.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 | ||
153 | /* | |
154 | * Add kernel context to tracer. | |
155 | */ | |
54d01ffb DG |
156 | int context_kernel_add(struct ltt_kernel_session *ksession, |
157 | struct lttng_event_context *ctx, char *event_name, | |
b579acd9 DG |
158 | char *channel_name) |
159 | { | |
160 | int ret; | |
161 | struct ltt_kernel_channel *kchan; | |
54d01ffb DG |
162 | struct lttng_kernel_context kctx; |
163 | ||
164 | /* Setup kernel context structure */ | |
165 | kctx.ctx = ctx->ctx; | |
166 | kctx.u.perf_counter.type = ctx->u.perf_counter.type; | |
167 | kctx.u.perf_counter.config = ctx->u.perf_counter.config; | |
168 | strncpy(kctx.u.perf_counter.name, ctx->u.perf_counter.name, | |
169 | LTTNG_SYMBOL_NAME_LEN); | |
170 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
b579acd9 DG |
171 | |
172 | if (strlen(channel_name) == 0) { | |
54d01ffb | 173 | ret = add_kctx_all_channels(ksession, &kctx, event_name); |
b579acd9 DG |
174 | if (ret != LTTCOMM_OK) { |
175 | goto error; | |
176 | } | |
177 | } else { | |
178 | /* Get kernel channel */ | |
62499ad6 | 179 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
b579acd9 DG |
180 | if (kchan == NULL) { |
181 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
182 | goto error; | |
183 | } | |
184 | ||
54d01ffb | 185 | ret = add_kctx_to_channel(&kctx, kchan, event_name); |
b579acd9 DG |
186 | if (ret != LTTCOMM_OK) { |
187 | goto error; | |
188 | } | |
189 | } | |
190 | ||
191 | ret = LTTCOMM_OK; | |
192 | ||
193 | error: | |
194 | return ret; | |
195 | } | |
2bdd86d4 MD |
196 | |
197 | /* | |
55cc08a6 | 198 | * Add UST context to tracer. |
2bdd86d4 | 199 | */ |
55cc08a6 DG |
200 | int context_ust_add(struct ltt_ust_session *usess, int domain, |
201 | struct lttng_event_context *ctx, char *event_name, | |
202 | char *channel_name) | |
2bdd86d4 | 203 | { |
55cc08a6 DG |
204 | int ret = LTTCOMM_OK, have_event = 0; |
205 | struct cds_lfht_iter iter, uiter; | |
206 | struct cds_lfht *chan_ht; | |
207 | struct ltt_ust_channel *uchan = NULL; | |
208 | struct ltt_ust_event *uevent = NULL; | |
209 | struct ltt_ust_context *uctx; | |
2bdd86d4 | 210 | |
55cc08a6 DG |
211 | switch (domain) { |
212 | case LTTNG_DOMAIN_UST: | |
213 | chan_ht = usess->domain_global.channels; | |
214 | break; | |
215 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
216 | case LTTNG_DOMAIN_UST_PID: | |
217 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
218 | default: | |
219 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2bdd86d4 MD |
220 | goto error; |
221 | } | |
2bdd86d4 | 222 | |
55cc08a6 DG |
223 | if (strlen(event_name) != 0) { |
224 | have_event = 1; | |
2bdd86d4 MD |
225 | } |
226 | ||
55cc08a6 DG |
227 | /* Get UST channel if defined */ |
228 | if (strlen(channel_name) != 0) { | |
229 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
230 | if (uchan == NULL) { | |
231 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2bdd86d4 MD |
232 | goto error; |
233 | } | |
55cc08a6 DG |
234 | } |
235 | ||
236 | /* If UST channel specified and event name, get UST event ref */ | |
237 | if (uchan && have_event) { | |
238 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); | |
239 | if (uevent == NULL) { | |
240 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; | |
2bdd86d4 | 241 | goto error; |
2bdd86d4 MD |
242 | } |
243 | } | |
244 | ||
55cc08a6 DG |
245 | /* Create ltt UST context */ |
246 | uctx = trace_ust_create_context(ctx); | |
247 | if (uctx == NULL) { | |
248 | ret = LTTCOMM_FATAL; | |
2bdd86d4 MD |
249 | goto error; |
250 | } | |
251 | ||
55cc08a6 DG |
252 | /* At this point, we have 4 possibilities */ |
253 | ||
254 | if (uchan && uevent) { /* Add ctx to event in channel */ | |
255 | ret = ust_app_add_ctx_event_glb(usess, uchan, uevent, uctx); | |
256 | } else if (uchan && !have_event) { /* Add ctx to channel */ | |
257 | ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx); | |
258 | } else if (!uchan && have_event) { /* Add ctx to event */ | |
259 | cds_lfht_for_each_entry(chan_ht, &iter, uchan, node) { | |
260 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); | |
261 | if (uevent != NULL) { | |
262 | ret = ust_app_add_ctx_event_glb(usess, uchan, uevent, uctx); | |
263 | /* | |
264 | * LTTng UST does not allowed the same event to be registered | |
265 | * multiple time in different or the same channel. So, if we | |
266 | * found our event in the first place, no need to continue. | |
267 | */ | |
268 | goto end; | |
269 | } | |
2bdd86d4 | 270 | } |
55cc08a6 DG |
271 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; |
272 | goto error_free_ctx; | |
273 | } else if (!uchan && !have_event) { /* Add ctx to all events, all channels */ | |
274 | cds_lfht_for_each_entry(chan_ht, &iter, uchan, node) { | |
275 | ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx); | |
276 | if (ret < 0) { | |
277 | /* Add failed so uctx was not added. We can keep it. */ | |
278 | continue; | |
279 | } | |
280 | cds_lfht_for_each_entry(uchan->events, &uiter, uevent, node) { | |
281 | ret = ust_app_add_ctx_event_glb(usess, uchan, uevent, uctx); | |
282 | if (ret < 0) { | |
283 | /* Add failed so uctx was not added. We can keep it. */ | |
284 | continue; | |
285 | } | |
286 | /* Create ltt UST context */ | |
287 | uctx = trace_ust_create_context(ctx); | |
288 | if (uctx == NULL) { | |
289 | ret = LTTCOMM_FATAL; | |
290 | goto error; | |
291 | } | |
292 | } | |
293 | /* Create ltt UST context */ | |
294 | uctx = trace_ust_create_context(ctx); | |
295 | if (uctx == NULL) { | |
296 | ret = LTTCOMM_FATAL; | |
297 | goto error; | |
298 | } | |
2bdd86d4 | 299 | } |
55cc08a6 | 300 | } |
2bdd86d4 | 301 | |
55cc08a6 DG |
302 | end: |
303 | switch (ret) { | |
304 | case -EEXIST: | |
305 | ret = LTTCOMM_UST_CONTEXT_EXIST; | |
306 | goto error_free_ctx; | |
307 | case -ENOMEM: | |
308 | ret = LTTCOMM_FATAL; | |
309 | goto error_free_ctx; | |
2bdd86d4 MD |
310 | } |
311 | ||
55cc08a6 | 312 | return LTTCOMM_OK; |
2bdd86d4 | 313 | |
55cc08a6 DG |
314 | error_free_ctx: |
315 | free(uctx); | |
2bdd86d4 MD |
316 | error: |
317 | return ret; | |
318 | } |