Commit | Line | Data |
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54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
54d01ffb | 7 | * |
d14d33bf AM |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
54d01ffb | 12 | * |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54d01ffb DG |
16 | */ |
17 | ||
7885e399 | 18 | #define _GNU_SOURCE |
56fff090 | 19 | #include <string.h> |
54d01ffb DG |
20 | #include <unistd.h> |
21 | ||
990570ed DG |
22 | #include <common/common.h> |
23 | #include <common/defaults.h> | |
db758600 | 24 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
25 | |
26 | #include "channel.h" | |
4771f025 | 27 | #include "kernel.h" |
44d3bd01 | 28 | #include "ust-ctl.h" |
54d01ffb | 29 | #include "utils.h" |
7885e399 | 30 | #include "ust-app.h" |
54d01ffb DG |
31 | |
32 | /* | |
33 | * Return allocated channel attributes. | |
34 | */ | |
f6cd6b0f | 35 | struct lttng_channel *channel_new_default_attr(int dom) |
54d01ffb DG |
36 | { |
37 | struct lttng_channel *chan; | |
38 | ||
39 | chan = zmalloc(sizeof(struct lttng_channel)); | |
40 | if (chan == NULL) { | |
7885e399 | 41 | PERROR("zmalloc channel init"); |
54d01ffb DG |
42 | goto error_alloc; |
43 | } | |
44 | ||
44d3bd01 DG |
45 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
46 | DEFAULT_CHANNEL_NAME) < 0) { | |
7885e399 | 47 | PERROR("snprintf default channel name"); |
54d01ffb DG |
48 | goto error; |
49 | } | |
50 | ||
51 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
54d01ffb DG |
52 | |
53 | switch (dom) { | |
1b1c65fa | 54 | case LTTNG_DOMAIN_KERNEL: |
3e230f92 SM |
55 | chan->attr.subbuf_size = |
56 | default_get_kernel_channel_subbuf_size(); | |
1b1c65fa MD |
57 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
58 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
6bb9e85f MD |
59 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
60 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
1b1c65fa MD |
61 | break; |
62 | case LTTNG_DOMAIN_UST: | |
d78d6610 | 63 | #if 0 |
1b1c65fa | 64 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 DG |
65 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
66 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
67 | #endif | |
3e230f92 | 68 | chan->attr.subbuf_size = default_get_ust_channel_subbuf_size(); |
1b1c65fa MD |
69 | chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; |
70 | chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
6bb9e85f MD |
71 | chan->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER; |
72 | chan->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER; | |
1b1c65fa MD |
73 | break; |
74 | default: | |
75 | goto error; /* Not implemented */ | |
54d01ffb DG |
76 | } |
77 | ||
78 | return chan; | |
79 | ||
80 | error: | |
81 | free(chan); | |
82 | error_alloc: | |
83 | return NULL; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Disable kernel channel of the kernel session. | |
88 | */ | |
89 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
90 | char *channel_name) | |
91 | { | |
92 | int ret; | |
93 | struct ltt_kernel_channel *kchan; | |
94 | ||
0525e9ae DG |
95 | assert(ksession); |
96 | assert(channel_name); | |
97 | ||
54d01ffb DG |
98 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
99 | if (kchan == NULL) { | |
f73fabfd | 100 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb | 101 | goto error; |
0525e9ae DG |
102 | } |
103 | ||
104 | /* Only if channel is enabled disable it. */ | |
105 | if (kchan->enabled == 1) { | |
54d01ffb | 106 | ret = kernel_disable_channel(kchan); |
7885e399 | 107 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 108 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
109 | goto error; |
110 | } | |
111 | } | |
112 | ||
f73fabfd | 113 | ret = LTTNG_OK; |
54d01ffb DG |
114 | |
115 | error: | |
116 | return ret; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Enable kernel channel of the kernel session. | |
121 | */ | |
122 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
123 | struct ltt_kernel_channel *kchan) | |
124 | { | |
125 | int ret; | |
126 | ||
0525e9ae DG |
127 | assert(ksession); |
128 | assert(kchan); | |
129 | ||
54d01ffb DG |
130 | if (kchan->enabled == 0) { |
131 | ret = kernel_enable_channel(kchan); | |
132 | if (ret < 0) { | |
f73fabfd | 133 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
134 | goto error; |
135 | } | |
42224349 | 136 | } else { |
f73fabfd | 137 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 138 | goto error; |
54d01ffb DG |
139 | } |
140 | ||
f73fabfd | 141 | ret = LTTNG_OK; |
54d01ffb DG |
142 | |
143 | error: | |
144 | return ret; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Create kernel channel of the kernel session and notify kernel thread. | |
149 | */ | |
150 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 151 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
152 | { |
153 | int ret; | |
ff4d74e6 | 154 | struct lttng_channel *defattr = NULL; |
54d01ffb | 155 | |
0525e9ae DG |
156 | assert(ksession); |
157 | ||
54d01ffb DG |
158 | /* Creating channel attributes if needed */ |
159 | if (attr == NULL) { | |
ff4d74e6 MD |
160 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL); |
161 | if (defattr == NULL) { | |
f73fabfd | 162 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
163 | goto error; |
164 | } | |
ff4d74e6 | 165 | attr = defattr; |
54d01ffb DG |
166 | } |
167 | ||
168 | /* Channel not found, creating it */ | |
fdd9eb17 | 169 | ret = kernel_create_channel(ksession, attr); |
54d01ffb | 170 | if (ret < 0) { |
f73fabfd | 171 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
172 | goto error; |
173 | } | |
174 | ||
175 | /* Notify kernel thread that there is a new channel */ | |
176 | ret = notify_thread_pipe(kernel_pipe); | |
177 | if (ret < 0) { | |
f73fabfd | 178 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
179 | goto error; |
180 | } | |
181 | ||
f73fabfd | 182 | ret = LTTNG_OK; |
54d01ffb | 183 | error: |
ff4d74e6 | 184 | free(defattr); |
54d01ffb DG |
185 | return ret; |
186 | } | |
7885e399 DG |
187 | |
188 | /* | |
189 | * Enable UST channel for session and domain. | |
190 | */ | |
191 | int channel_ust_enable(struct ltt_ust_session *usess, int domain, | |
192 | struct ltt_ust_channel *uchan) | |
193 | { | |
f73fabfd | 194 | int ret = LTTNG_OK; |
7885e399 | 195 | |
0525e9ae DG |
196 | assert(usess); |
197 | assert(uchan); | |
198 | ||
7885e399 DG |
199 | /* If already enabled, everything is OK */ |
200 | if (uchan->enabled) { | |
201 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 202 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 DG |
203 | goto end; |
204 | } | |
205 | ||
206 | switch (domain) { | |
207 | case LTTNG_DOMAIN_UST: | |
208 | DBG2("Channel %s being enabled in UST global domain", uchan->name); | |
4d710ac2 DG |
209 | |
210 | /* | |
211 | * Enable channel for UST global domain on all applications. Ignore | |
212 | * return value here since whatever error we got, it means that the | |
213 | * channel was not created on one or many registered applications and | |
214 | * we can not report this to the user yet. However, at this stage, the | |
215 | * channel was successfully created on the session daemon side so the | |
216 | * enable-channel command is a success. | |
217 | */ | |
218 | (void) ust_app_create_channel_glb(usess, uchan); | |
7885e399 | 219 | break; |
d78d6610 | 220 | #if 0 |
7885e399 DG |
221 | case LTTNG_DOMAIN_UST_PID: |
222 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
223 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
d78d6610 DG |
224 | #endif |
225 | default: | |
f73fabfd | 226 | ret = LTTNG_ERR_UND; |
7885e399 DG |
227 | goto error; |
228 | } | |
229 | ||
7885e399 DG |
230 | uchan->enabled = 1; |
231 | DBG2("Channel %s enabled successfully", uchan->name); | |
232 | ||
233 | end: | |
234 | error: | |
235 | return ret; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Create UST channel for session and domain. | |
240 | */ | |
241 | int channel_ust_create(struct ltt_ust_session *usess, int domain, | |
242 | struct lttng_channel *attr) | |
243 | { | |
f73fabfd | 244 | int ret = LTTNG_OK; |
7885e399 DG |
245 | struct ltt_ust_channel *uchan = NULL; |
246 | struct lttng_channel *defattr = NULL; | |
247 | ||
0525e9ae DG |
248 | assert(usess); |
249 | ||
7885e399 DG |
250 | /* Creating channel attributes if needed */ |
251 | if (attr == NULL) { | |
252 | defattr = channel_new_default_attr(domain); | |
253 | if (defattr == NULL) { | |
f73fabfd | 254 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
255 | goto error; |
256 | } | |
257 | attr = defattr; | |
258 | } | |
259 | ||
95e047ff DG |
260 | if (attr->attr.subbuf_size < DEFAULT_UST_CHANNEL_SUBBUF_SIZE) { |
261 | ret = LTTNG_ERR_INVALID; | |
262 | goto error; | |
263 | } | |
264 | ||
b024d072 | 265 | /* |
0525e9ae DG |
266 | * Validate UST buffer size and number of buffers: must both be power of 2 |
267 | * and nonzero. We validate right here for UST, because applications will | |
268 | * not report the error to the user (unlike kernel tracing). | |
b024d072 | 269 | */ |
0525e9ae DG |
270 | if (!attr->attr.subbuf_size || |
271 | (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 272 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
273 | goto error; |
274 | } | |
0525e9ae DG |
275 | |
276 | if (!attr->attr.num_subbuf || | |
277 | (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 278 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
279 | goto error; |
280 | } | |
281 | ||
a79d84dd DG |
282 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
283 | ret = LTTNG_ERR_NOT_SUPPORTED; | |
284 | goto error; | |
285 | } | |
286 | ||
7885e399 DG |
287 | /* Create UST channel */ |
288 | uchan = trace_ust_create_channel(attr, usess->pathname); | |
289 | if (uchan == NULL) { | |
f73fabfd | 290 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
291 | goto error; |
292 | } | |
58f3ca76 | 293 | uchan->enabled = 1; |
7885e399 DG |
294 | |
295 | switch (domain) { | |
296 | case LTTNG_DOMAIN_UST: | |
297 | DBG2("Channel %s being created in UST global domain", uchan->name); | |
58f3ca76 | 298 | |
7885e399 DG |
299 | /* Enable channel for global domain */ |
300 | ret = ust_app_create_channel_glb(usess, uchan); | |
301 | break; | |
d78d6610 | 302 | #if 0 |
7885e399 DG |
303 | case LTTNG_DOMAIN_UST_PID: |
304 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
305 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
d78d6610 | 306 | #endif |
7885e399 | 307 | default: |
f73fabfd | 308 | ret = LTTNG_ERR_UND; |
7885e399 DG |
309 | goto error_free_chan; |
310 | } | |
311 | ||
49c336c1 | 312 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 313 | ret = LTTNG_ERR_UST_CHAN_FAIL; |
7885e399 DG |
314 | goto error_free_chan; |
315 | } | |
316 | ||
fc34caaa DG |
317 | /* Adding the channel to the channel hash table. */ |
318 | rcu_read_lock(); | |
319 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
320 | rcu_read_unlock(); | |
321 | ||
7885e399 DG |
322 | DBG2("Channel %s created successfully", uchan->name); |
323 | ||
324 | free(defattr); | |
f73fabfd | 325 | return LTTNG_OK; |
7885e399 DG |
326 | |
327 | error_free_chan: | |
24d1723f DG |
328 | /* |
329 | * No need to remove the channel from the hash table because at this point | |
330 | * it was not added hence the direct call and no call_rcu(). | |
331 | */ | |
7885e399 DG |
332 | trace_ust_destroy_channel(uchan); |
333 | error: | |
334 | free(defattr); | |
335 | return ret; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Disable UST channel for session and domain. | |
340 | */ | |
341 | int channel_ust_disable(struct ltt_ust_session *usess, int domain, | |
342 | struct ltt_ust_channel *uchan) | |
343 | { | |
f73fabfd | 344 | int ret = LTTNG_OK; |
7885e399 | 345 | |
0525e9ae DG |
346 | assert(usess); |
347 | assert(uchan); | |
348 | ||
7885e399 DG |
349 | /* Already disabled */ |
350 | if (uchan->enabled == 0) { | |
351 | DBG2("Channel UST %s already disabled", uchan->name); | |
352 | goto end; | |
353 | } | |
354 | ||
355 | /* Get the right channel's hashtable */ | |
356 | switch (domain) { | |
357 | case LTTNG_DOMAIN_UST: | |
358 | DBG2("Channel %s being disabled in UST global domain", uchan->name); | |
7885e399 DG |
359 | /* Disable channel for global domain */ |
360 | ret = ust_app_disable_channel_glb(usess, uchan); | |
361 | break; | |
d78d6610 | 362 | #if 0 |
7885e399 DG |
363 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
364 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
365 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 DG |
366 | #endif |
367 | default: | |
f73fabfd | 368 | ret = LTTNG_ERR_UND; |
7885e399 DG |
369 | goto error; |
370 | } | |
371 | ||
49c336c1 | 372 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 373 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
374 | goto error; |
375 | } | |
376 | ||
377 | uchan->enabled = 0; | |
378 | ||
379 | DBG2("Channel %s disabled successfully", uchan->name); | |
380 | ||
f73fabfd | 381 | return LTTNG_OK; |
7885e399 DG |
382 | |
383 | end: | |
384 | error: | |
385 | return ret; | |
386 | } |