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 |
6c1c0768 | 19 | #define _LGPL_SOURCE |
7972aab2 | 20 | #include <inttypes.h> |
56fff090 | 21 | #include <string.h> |
54d01ffb DG |
22 | #include <unistd.h> |
23 | ||
990570ed DG |
24 | #include <common/common.h> |
25 | #include <common/defaults.h> | |
db758600 | 26 | #include <common/sessiond-comm/sessiond-comm.h> |
54d01ffb DG |
27 | |
28 | #include "channel.h" | |
12744796 | 29 | #include "lttng-sessiond.h" |
4771f025 | 30 | #include "kernel.h" |
44d3bd01 | 31 | #include "ust-ctl.h" |
54d01ffb | 32 | #include "utils.h" |
7885e399 | 33 | #include "ust-app.h" |
54d01ffb DG |
34 | |
35 | /* | |
36 | * Return allocated channel attributes. | |
37 | */ | |
0a9c6494 DG |
38 | struct lttng_channel *channel_new_default_attr(int dom, |
39 | enum lttng_buffer_type type) | |
54d01ffb DG |
40 | { |
41 | struct lttng_channel *chan; | |
42 | ||
43 | chan = zmalloc(sizeof(struct lttng_channel)); | |
44 | if (chan == NULL) { | |
7885e399 | 45 | PERROR("zmalloc channel init"); |
54d01ffb DG |
46 | goto error_alloc; |
47 | } | |
48 | ||
44d3bd01 DG |
49 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
50 | DEFAULT_CHANNEL_NAME) < 0) { | |
7885e399 | 51 | PERROR("snprintf default channel name"); |
54d01ffb DG |
52 | goto error; |
53 | } | |
54 | ||
0a9c6494 | 55 | /* Same for all domains. */ |
54d01ffb | 56 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
0a9c6494 DG |
57 | chan->attr.tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; |
58 | chan->attr.tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
54d01ffb DG |
59 | |
60 | switch (dom) { | |
1b1c65fa | 61 | case LTTNG_DOMAIN_KERNEL: |
0a9c6494 | 62 | assert(type == LTTNG_BUFFER_GLOBAL); |
3e230f92 SM |
63 | chan->attr.subbuf_size = |
64 | default_get_kernel_channel_subbuf_size(); | |
1b1c65fa MD |
65 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
66 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
6bb9e85f MD |
67 | chan->attr.switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
68 | chan->attr.read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
ecc48a90 | 69 | chan->attr.live_timer_interval = DEFAULT_KERNEL_CHANNEL_LIVE_TIMER; |
1b1c65fa MD |
70 | break; |
71 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
72 | switch (type) { |
73 | case LTTNG_BUFFER_PER_UID: | |
74 | chan->attr.subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
75 | chan->attr.num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
76 | chan->attr.output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
77 | chan->attr.switch_timer_interval = | |
78 | DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
79 | chan->attr.read_timer_interval = | |
80 | DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
ecc48a90 JD |
81 | chan->attr.live_timer_interval = |
82 | DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; | |
0a9c6494 DG |
83 | break; |
84 | case LTTNG_BUFFER_PER_PID: | |
85 | default: | |
86 | chan->attr.subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
87 | chan->attr.num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
88 | chan->attr.output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
89 | chan->attr.switch_timer_interval = | |
90 | DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
91 | chan->attr.read_timer_interval = | |
92 | DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
ecc48a90 JD |
93 | chan->attr.live_timer_interval = |
94 | DEFAULT_UST_UID_CHANNEL_LIVE_TIMER; | |
0a9c6494 DG |
95 | break; |
96 | } | |
1b1c65fa MD |
97 | break; |
98 | default: | |
99 | goto error; /* Not implemented */ | |
54d01ffb DG |
100 | } |
101 | ||
102 | return chan; | |
103 | ||
104 | error: | |
105 | free(chan); | |
106 | error_alloc: | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Disable kernel channel of the kernel session. | |
112 | */ | |
113 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
114 | char *channel_name) | |
115 | { | |
116 | int ret; | |
117 | struct ltt_kernel_channel *kchan; | |
118 | ||
0525e9ae DG |
119 | assert(ksession); |
120 | assert(channel_name); | |
121 | ||
54d01ffb DG |
122 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); |
123 | if (kchan == NULL) { | |
f73fabfd | 124 | ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND; |
54d01ffb | 125 | goto error; |
0525e9ae DG |
126 | } |
127 | ||
128 | /* Only if channel is enabled disable it. */ | |
129 | if (kchan->enabled == 1) { | |
54d01ffb | 130 | ret = kernel_disable_channel(kchan); |
7885e399 | 131 | if (ret < 0 && ret != -EEXIST) { |
f73fabfd | 132 | ret = LTTNG_ERR_KERN_CHAN_DISABLE_FAIL; |
54d01ffb DG |
133 | goto error; |
134 | } | |
135 | } | |
136 | ||
f73fabfd | 137 | ret = LTTNG_OK; |
54d01ffb DG |
138 | |
139 | error: | |
140 | return ret; | |
141 | } | |
142 | ||
143 | /* | |
144 | * Enable kernel channel of the kernel session. | |
145 | */ | |
146 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
147 | struct ltt_kernel_channel *kchan) | |
148 | { | |
149 | int ret; | |
150 | ||
0525e9ae DG |
151 | assert(ksession); |
152 | assert(kchan); | |
153 | ||
54d01ffb DG |
154 | if (kchan->enabled == 0) { |
155 | ret = kernel_enable_channel(kchan); | |
156 | if (ret < 0) { | |
f73fabfd | 157 | ret = LTTNG_ERR_KERN_CHAN_ENABLE_FAIL; |
54d01ffb DG |
158 | goto error; |
159 | } | |
42224349 | 160 | } else { |
f73fabfd | 161 | ret = LTTNG_ERR_KERN_CHAN_EXIST; |
42224349 | 162 | goto error; |
54d01ffb DG |
163 | } |
164 | ||
f73fabfd | 165 | ret = LTTNG_OK; |
54d01ffb DG |
166 | |
167 | error: | |
168 | return ret; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Create kernel channel of the kernel session and notify kernel thread. | |
173 | */ | |
174 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 175 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
176 | { |
177 | int ret; | |
ff4d74e6 | 178 | struct lttng_channel *defattr = NULL; |
54d01ffb | 179 | |
0525e9ae DG |
180 | assert(ksession); |
181 | ||
54d01ffb DG |
182 | /* Creating channel attributes if needed */ |
183 | if (attr == NULL) { | |
0a9c6494 DG |
184 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL, |
185 | LTTNG_BUFFER_GLOBAL); | |
ff4d74e6 | 186 | if (defattr == NULL) { |
f73fabfd | 187 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
188 | goto error; |
189 | } | |
ff4d74e6 | 190 | attr = defattr; |
54d01ffb DG |
191 | } |
192 | ||
27babd3a DG |
193 | if (ksession->snapshot_mode) { |
194 | /* Force channel attribute for snapshot mode. */ | |
195 | attr->attr.overwrite = 1; | |
196 | attr->attr.output = LTTNG_EVENT_MMAP; | |
197 | } | |
198 | ||
54d01ffb | 199 | /* Channel not found, creating it */ |
fdd9eb17 | 200 | ret = kernel_create_channel(ksession, attr); |
54d01ffb | 201 | if (ret < 0) { |
f73fabfd | 202 | ret = LTTNG_ERR_KERN_CHAN_FAIL; |
54d01ffb DG |
203 | goto error; |
204 | } | |
205 | ||
206 | /* Notify kernel thread that there is a new channel */ | |
207 | ret = notify_thread_pipe(kernel_pipe); | |
208 | if (ret < 0) { | |
f73fabfd | 209 | ret = LTTNG_ERR_FATAL; |
54d01ffb DG |
210 | goto error; |
211 | } | |
212 | ||
f73fabfd | 213 | ret = LTTNG_OK; |
54d01ffb | 214 | error: |
ff4d74e6 | 215 | free(defattr); |
54d01ffb DG |
216 | return ret; |
217 | } | |
7885e399 DG |
218 | |
219 | /* | |
220 | * Enable UST channel for session and domain. | |
221 | */ | |
7972aab2 | 222 | int channel_ust_enable(struct ltt_ust_session *usess, |
7885e399 DG |
223 | struct ltt_ust_channel *uchan) |
224 | { | |
f73fabfd | 225 | int ret = LTTNG_OK; |
7885e399 | 226 | |
0525e9ae DG |
227 | assert(usess); |
228 | assert(uchan); | |
229 | ||
7885e399 DG |
230 | /* If already enabled, everything is OK */ |
231 | if (uchan->enabled) { | |
232 | DBG3("Channel %s already enabled. Skipping", uchan->name); | |
f73fabfd | 233 | ret = LTTNG_ERR_UST_CHAN_EXIST; |
7885e399 DG |
234 | goto end; |
235 | } | |
236 | ||
7972aab2 DG |
237 | DBG2("Channel %s being enabled in UST domain", uchan->name); |
238 | ||
239 | /* | |
240 | * Enable channel for UST global domain on all applications. Ignore return | |
241 | * value here since whatever error we got, it means that the channel was | |
242 | * not created on one or many registered applications and we can not report | |
243 | * this to the user yet. However, at this stage, the channel was | |
244 | * successfully created on the session daemon side so the enable-channel | |
245 | * command is a success. | |
246 | */ | |
d54b4440 | 247 | (void) ust_app_enable_channel_glb(usess, uchan); |
7885e399 | 248 | |
7885e399 DG |
249 | uchan->enabled = 1; |
250 | DBG2("Channel %s enabled successfully", uchan->name); | |
251 | ||
252 | end: | |
7885e399 DG |
253 | return ret; |
254 | } | |
255 | ||
256 | /* | |
257 | * Create UST channel for session and domain. | |
258 | */ | |
7972aab2 DG |
259 | int channel_ust_create(struct ltt_ust_session *usess, |
260 | struct lttng_channel *attr, enum lttng_buffer_type type) | |
7885e399 | 261 | { |
f73fabfd | 262 | int ret = LTTNG_OK; |
7885e399 DG |
263 | struct ltt_ust_channel *uchan = NULL; |
264 | struct lttng_channel *defattr = NULL; | |
265 | ||
0525e9ae DG |
266 | assert(usess); |
267 | ||
7885e399 DG |
268 | /* Creating channel attributes if needed */ |
269 | if (attr == NULL) { | |
0a9c6494 | 270 | defattr = channel_new_default_attr(LTTNG_DOMAIN_UST, type); |
7885e399 | 271 | if (defattr == NULL) { |
f73fabfd | 272 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
273 | goto error; |
274 | } | |
275 | attr = defattr; | |
276 | } | |
277 | ||
27babd3a DG |
278 | if (usess->snapshot_mode) { |
279 | /* Force channel attribute for snapshot mode. */ | |
280 | attr->attr.overwrite = 1; | |
281 | attr->attr.output = LTTNG_EVENT_MMAP; | |
282 | } | |
283 | ||
b024d072 | 284 | /* |
0525e9ae DG |
285 | * Validate UST buffer size and number of buffers: must both be power of 2 |
286 | * and nonzero. We validate right here for UST, because applications will | |
287 | * not report the error to the user (unlike kernel tracing). | |
b024d072 | 288 | */ |
0525e9ae DG |
289 | if (!attr->attr.subbuf_size || |
290 | (attr->attr.subbuf_size & (attr->attr.subbuf_size - 1))) { | |
f73fabfd | 291 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
292 | goto error; |
293 | } | |
0525e9ae | 294 | |
12744796 DG |
295 | /* |
296 | * Invalid subbuffer size if it's lower then the page size. | |
297 | */ | |
298 | if (attr->attr.subbuf_size < page_size) { | |
299 | ret = LTTNG_ERR_INVALID; | |
300 | goto error; | |
301 | } | |
302 | ||
0525e9ae DG |
303 | if (!attr->attr.num_subbuf || |
304 | (attr->attr.num_subbuf & (attr->attr.num_subbuf - 1))) { | |
f73fabfd | 305 | ret = LTTNG_ERR_INVALID; |
b024d072 MD |
306 | goto error; |
307 | } | |
308 | ||
a79d84dd DG |
309 | if (attr->attr.output != LTTNG_EVENT_MMAP) { |
310 | ret = LTTNG_ERR_NOT_SUPPORTED; | |
311 | goto error; | |
312 | } | |
313 | ||
1624d5b7 JD |
314 | /* |
315 | * The tracefile_size should not be < to the subbuf_size, otherwise | |
316 | * we won't be able to write the packets on disk | |
317 | */ | |
318 | if ((attr->attr.tracefile_size > 0) && | |
319 | (attr->attr.tracefile_size < attr->attr.subbuf_size)) { | |
320 | ret = LTTNG_ERR_INVALID; | |
321 | goto error; | |
322 | } | |
323 | ||
2e8269f7 DG |
324 | /* Validate buffer type. */ |
325 | switch (type) { | |
326 | case LTTNG_BUFFER_PER_PID: | |
0a9c6494 | 327 | break; |
2e8269f7 DG |
328 | case LTTNG_BUFFER_PER_UID: |
329 | break; | |
330 | default: | |
331 | ret = LTTNG_ERR_BUFFER_NOT_SUPPORTED; | |
332 | goto error; | |
333 | } | |
334 | ||
7885e399 | 335 | /* Create UST channel */ |
dec56f6c | 336 | uchan = trace_ust_create_channel(attr); |
7885e399 | 337 | if (uchan == NULL) { |
f73fabfd | 338 | ret = LTTNG_ERR_FATAL; |
7885e399 DG |
339 | goto error; |
340 | } | |
58f3ca76 | 341 | uchan->enabled = 1; |
7972aab2 DG |
342 | if (trace_ust_is_max_id(usess->used_channel_id)) { |
343 | ret = LTTNG_ERR_UST_CHAN_FAIL; | |
344 | goto error; | |
345 | } | |
346 | uchan->id = trace_ust_get_next_chan_id(usess); | |
347 | ||
348 | DBG2("Channel %s is being created for UST with buffer %d and id %" PRIu64, | |
349 | uchan->name, type, uchan->id); | |
350 | ||
351 | /* Flag session buffer type. */ | |
352 | if (!usess->buffer_type_changed) { | |
353 | usess->buffer_type = type; | |
354 | usess->buffer_type_changed = 1; | |
355 | } else if (usess->buffer_type != type) { | |
356 | /* Buffer type was already set. Refuse to create channel. */ | |
357 | ret = LTTNG_ERR_BUFFER_TYPE_MISMATCH; | |
7885e399 DG |
358 | goto error_free_chan; |
359 | } | |
360 | ||
7972aab2 DG |
361 | /* Enable channel for global domain */ |
362 | ret = ust_app_create_channel_glb(usess, uchan); | |
49c336c1 | 363 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 364 | ret = LTTNG_ERR_UST_CHAN_FAIL; |
7885e399 DG |
365 | goto error_free_chan; |
366 | } | |
367 | ||
fc34caaa DG |
368 | /* Adding the channel to the channel hash table. */ |
369 | rcu_read_lock(); | |
ad7a9107 DG |
370 | if (strncmp(uchan->name, DEFAULT_METADATA_NAME, |
371 | sizeof(uchan->name))) { | |
372 | lttng_ht_add_unique_str(usess->domain_global.channels, &uchan->node); | |
84ad93e8 DG |
373 | } else { |
374 | /* | |
375 | * Copy channel attribute to session if this is metadata so if NO | |
376 | * application exists we can access that data in the shadow copy during | |
377 | * the global update of newly registered application. | |
378 | */ | |
379 | memcpy(&usess->metadata_attr, &uchan->attr, | |
380 | sizeof(usess->metadata_attr)); | |
ad7a9107 | 381 | } |
fc34caaa DG |
382 | rcu_read_unlock(); |
383 | ||
7885e399 DG |
384 | DBG2("Channel %s created successfully", uchan->name); |
385 | ||
386 | free(defattr); | |
f73fabfd | 387 | return LTTNG_OK; |
7885e399 DG |
388 | |
389 | error_free_chan: | |
24d1723f DG |
390 | /* |
391 | * No need to remove the channel from the hash table because at this point | |
392 | * it was not added hence the direct call and no call_rcu(). | |
393 | */ | |
7885e399 DG |
394 | trace_ust_destroy_channel(uchan); |
395 | error: | |
396 | free(defattr); | |
397 | return ret; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Disable UST channel for session and domain. | |
402 | */ | |
7972aab2 | 403 | int channel_ust_disable(struct ltt_ust_session *usess, |
7885e399 DG |
404 | struct ltt_ust_channel *uchan) |
405 | { | |
f73fabfd | 406 | int ret = LTTNG_OK; |
7885e399 | 407 | |
0525e9ae DG |
408 | assert(usess); |
409 | assert(uchan); | |
410 | ||
7885e399 DG |
411 | /* Already disabled */ |
412 | if (uchan->enabled == 0) { | |
413 | DBG2("Channel UST %s already disabled", uchan->name); | |
414 | goto end; | |
415 | } | |
416 | ||
7972aab2 DG |
417 | DBG2("Channel %s being disabled in UST global domain", uchan->name); |
418 | /* Disable channel for global domain */ | |
419 | ret = ust_app_disable_channel_glb(usess, uchan); | |
49c336c1 | 420 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
f73fabfd | 421 | ret = LTTNG_ERR_UST_CHAN_DISABLE_FAIL; |
7885e399 DG |
422 | goto error; |
423 | } | |
424 | ||
425 | uchan->enabled = 0; | |
426 | ||
427 | DBG2("Channel %s disabled successfully", uchan->name); | |
428 | ||
f73fabfd | 429 | return LTTNG_OK; |
7885e399 DG |
430 | |
431 | end: | |
432 | error: | |
433 | return ret; | |
434 | } |