Commit | Line | Data |
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57773204 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; only version 2 | |
8 | * of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #include <string.h> | |
4318ae1b MD |
21 | #include <lttng/ust-ctl.h> |
22 | #include <lttng/ust-abi.h> | |
23 | #include <lttng/usterr-signal-safe.h> | |
24 | #include <lttng/ust-comm.h> | |
c1fca457 | 25 | #include <lttng/ust-events.h> |
57773204 MD |
26 | |
27 | #include "../libringbuffer/backend.h" | |
28 | #include "../libringbuffer/frontend.h" | |
29 | ||
6b120308 MD |
30 | volatile enum ust_loglevel ust_loglevel; |
31 | ||
57773204 | 32 | static |
61f02aea | 33 | void init_object(struct lttng_ust_object_data *data) |
57773204 MD |
34 | { |
35 | data->handle = -1; | |
36 | data->shm_fd = -1; | |
37 | data->wait_fd = -1; | |
38 | data->memory_map_size = 0; | |
39 | } | |
40 | ||
5f9d3dbc | 41 | void ustctl_release_object(int sock, struct lttng_ust_object_data *data) |
57773204 MD |
42 | { |
43 | struct ustcomm_ust_msg lum; | |
44 | struct ustcomm_ust_reply lur; | |
45 | int ret; | |
46 | ||
47 | if (data->shm_fd >= 0) | |
48 | close(data->shm_fd); | |
49 | if (data->wait_fd >= 0) | |
50 | close(data->wait_fd); | |
51 | memset(&lum, 0, sizeof(lum)); | |
52 | lum.handle = data->handle; | |
53 | lum.cmd = LTTNG_UST_RELEASE; | |
54 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
55 | assert(!ret); | |
56 | free(data); | |
57 | } | |
58 | ||
1c5e467e MD |
59 | /* |
60 | * Send registration done packet to the application. | |
61 | */ | |
62 | int ustctl_register_done(int sock) | |
63 | { | |
64 | struct ustcomm_ust_msg lum; | |
65 | struct ustcomm_ust_reply lur; | |
66 | int ret; | |
67 | ||
68 | DBG("Sending register done command to %d", sock); | |
69 | memset(&lum, 0, sizeof(lum)); | |
70 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
71 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
72 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
73 | if (ret) | |
74 | return ret; | |
75 | if (lur.ret_code != USTCOMM_OK) { | |
76 | DBG("Return code: %s", ustcomm_get_readable_code(lur.ret_code)); | |
77 | goto error; | |
78 | } | |
79 | return 0; | |
80 | ||
81 | error: | |
82 | return -1; | |
83 | } | |
84 | ||
57773204 MD |
85 | /* |
86 | * returns session handle. | |
87 | */ | |
88 | int ustctl_create_session(int sock) | |
89 | { | |
90 | struct ustcomm_ust_msg lum; | |
91 | struct ustcomm_ust_reply lur; | |
92 | int ret, session_handle; | |
93 | ||
94 | /* Create session */ | |
95 | memset(&lum, 0, sizeof(lum)); | |
96 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
97 | lum.cmd = LTTNG_UST_SESSION; | |
98 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
99 | if (ret) | |
100 | return ret; | |
101 | session_handle = lur.ret_val; | |
102 | DBG("received session handle %u", session_handle); | |
103 | return session_handle; | |
104 | } | |
105 | ||
106 | /* open the metadata global channel */ | |
107 | int ustctl_open_metadata(int sock, int session_handle, | |
108 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 109 | struct lttng_ust_object_data **_metadata_data) |
57773204 MD |
110 | { |
111 | struct ustcomm_ust_msg lum; | |
112 | struct ustcomm_ust_reply lur; | |
61f02aea | 113 | struct lttng_ust_object_data *metadata_data; |
57773204 MD |
114 | int ret; |
115 | ||
116 | metadata_data = malloc(sizeof(*metadata_data)); | |
117 | if (!metadata_data) | |
118 | return -ENOMEM; | |
119 | init_object(metadata_data); | |
120 | /* Create metadata channel */ | |
121 | memset(&lum, 0, sizeof(lum)); | |
122 | lum.handle = session_handle; | |
123 | lum.cmd = LTTNG_UST_METADATA; | |
124 | lum.u.channel.overwrite = chops->overwrite; | |
125 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
126 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
127 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
128 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
129 | lum.u.channel.output = chops->output; | |
130 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
131 | if (ret) { | |
132 | free(metadata_data); | |
133 | return ret; | |
134 | } | |
135 | if (lur.ret_code != USTCOMM_OK) { | |
136 | free(metadata_data); | |
137 | return lur.ret_code; | |
138 | } | |
139 | metadata_data->handle = lur.ret_val; | |
140 | DBG("received metadata handle %u", metadata_data->handle); | |
141 | metadata_data->memory_map_size = lur.u.channel.memory_map_size; | |
142 | /* get shm fd */ | |
143 | ret = ustcomm_recv_fd(sock); | |
144 | if (ret < 0) | |
145 | goto error; | |
146 | metadata_data->shm_fd = ret; | |
147 | /* get wait fd */ | |
148 | ret = ustcomm_recv_fd(sock); | |
149 | if (ret < 0) | |
150 | goto error; | |
151 | metadata_data->wait_fd = ret; | |
152 | *_metadata_data = metadata_data; | |
153 | return 0; | |
154 | ||
155 | error: | |
5f9d3dbc | 156 | ustctl_release_object(sock, metadata_data); |
57773204 MD |
157 | return -EINVAL; |
158 | } | |
159 | ||
160 | int ustctl_create_channel(int sock, int session_handle, | |
161 | struct lttng_ust_channel_attr *chops, | |
61f02aea | 162 | struct lttng_ust_object_data **_channel_data) |
57773204 MD |
163 | { |
164 | struct ustcomm_ust_msg lum; | |
165 | struct ustcomm_ust_reply lur; | |
61f02aea | 166 | struct lttng_ust_object_data *channel_data; |
57773204 MD |
167 | int ret; |
168 | ||
169 | channel_data = malloc(sizeof(*channel_data)); | |
170 | if (!channel_data) | |
171 | return -ENOMEM; | |
172 | init_object(channel_data); | |
173 | /* Create metadata channel */ | |
174 | memset(&lum, 0, sizeof(lum)); | |
175 | lum.handle = session_handle; | |
176 | lum.cmd = LTTNG_UST_CHANNEL; | |
177 | lum.u.channel.overwrite = chops->overwrite; | |
178 | lum.u.channel.subbuf_size = chops->subbuf_size; | |
179 | lum.u.channel.num_subbuf = chops->num_subbuf; | |
180 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; | |
181 | lum.u.channel.read_timer_interval = chops->read_timer_interval; | |
182 | lum.u.channel.output = chops->output; | |
183 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
184 | if (ret) { | |
185 | free(channel_data); | |
186 | return ret; | |
187 | } | |
188 | if (lur.ret_code != USTCOMM_OK) { | |
189 | free(channel_data); | |
190 | return lur.ret_code; | |
191 | } | |
192 | channel_data->handle = lur.ret_val; | |
193 | DBG("received channel handle %u", channel_data->handle); | |
194 | channel_data->memory_map_size = lur.u.channel.memory_map_size; | |
195 | /* get shm fd */ | |
196 | ret = ustcomm_recv_fd(sock); | |
197 | if (ret < 0) | |
198 | goto error; | |
199 | channel_data->shm_fd = ret; | |
200 | /* get wait fd */ | |
201 | ret = ustcomm_recv_fd(sock); | |
202 | if (ret < 0) | |
203 | goto error; | |
204 | channel_data->wait_fd = ret; | |
205 | *_channel_data = channel_data; | |
206 | return 0; | |
207 | ||
208 | error: | |
5f9d3dbc | 209 | ustctl_release_object(sock, channel_data); |
57773204 MD |
210 | return -EINVAL; |
211 | } | |
212 | ||
213 | /* | |
214 | * Return -ENOENT if no more stream is available for creation. | |
215 | * Return 0 on success. | |
216 | * Return negative error value on error. | |
217 | */ | |
61f02aea MD |
218 | int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data, |
219 | struct lttng_ust_object_data **_stream_data) | |
57773204 MD |
220 | { |
221 | struct ustcomm_ust_msg lum; | |
222 | struct ustcomm_ust_reply lur; | |
61f02aea | 223 | struct lttng_ust_object_data *stream_data; |
57773204 MD |
224 | int ret, fd; |
225 | ||
226 | stream_data = malloc(sizeof(*stream_data)); | |
227 | if (!stream_data) | |
228 | return -ENOMEM; | |
229 | init_object(stream_data); | |
230 | memset(&lum, 0, sizeof(lum)); | |
231 | lum.handle = channel_data->handle; | |
232 | lum.cmd = LTTNG_UST_STREAM; | |
233 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
234 | if (ret) { | |
235 | free(stream_data); | |
236 | return ret; | |
237 | } | |
238 | if (lur.ret_code != USTCOMM_OK) { | |
239 | free(stream_data); | |
240 | return lur.ret_code; | |
241 | } | |
242 | ||
243 | stream_data->handle = lur.ret_val; | |
244 | DBG("received stream handle %u", stream_data->handle); | |
245 | stream_data->memory_map_size = lur.u.stream.memory_map_size; | |
246 | /* get shm fd */ | |
247 | fd = ustcomm_recv_fd(sock); | |
248 | if (fd < 0) | |
249 | goto error; | |
250 | stream_data->shm_fd = fd; | |
251 | /* get wait fd */ | |
252 | fd = ustcomm_recv_fd(sock); | |
253 | if (fd < 0) | |
254 | goto error; | |
255 | stream_data->wait_fd = fd; | |
256 | *_stream_data = stream_data; | |
257 | return ret; | |
258 | ||
259 | error: | |
5f9d3dbc | 260 | ustctl_release_object(sock, stream_data); |
57773204 MD |
261 | return -EINVAL; |
262 | } | |
263 | ||
264 | int ustctl_create_event(int sock, struct lttng_ust_event *ev, | |
61f02aea MD |
265 | struct lttng_ust_object_data *channel_data, |
266 | struct lttng_ust_object_data **_event_data) | |
57773204 MD |
267 | { |
268 | struct ustcomm_ust_msg lum; | |
269 | struct ustcomm_ust_reply lur; | |
61f02aea | 270 | struct lttng_ust_object_data *event_data; |
57773204 MD |
271 | int ret; |
272 | ||
273 | event_data = malloc(sizeof(*event_data)); | |
274 | if (!event_data) | |
275 | return -ENOMEM; | |
276 | init_object(event_data); | |
277 | memset(&lum, 0, sizeof(lum)); | |
278 | lum.handle = channel_data->handle; | |
279 | lum.cmd = LTTNG_UST_EVENT; | |
280 | strncpy(lum.u.event.name, ev->name, | |
281 | LTTNG_UST_SYM_NAME_LEN); | |
282 | lum.u.event.instrumentation = ev->instrumentation; | |
283 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
284 | if (ret) { | |
285 | free(event_data); | |
286 | return ret; | |
287 | } | |
288 | event_data->handle = lur.ret_val; | |
289 | DBG("received event handle %u", event_data->handle); | |
290 | *_event_data = event_data; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | int ustctl_add_context(int sock, struct lttng_ust_context *ctx, | |
61f02aea MD |
295 | struct lttng_ust_object_data *obj_data, |
296 | struct lttng_ust_object_data **_context_data) | |
57773204 MD |
297 | { |
298 | struct ustcomm_ust_msg lum; | |
299 | struct ustcomm_ust_reply lur; | |
61f02aea | 300 | struct lttng_ust_object_data *context_data; |
57773204 MD |
301 | int ret; |
302 | ||
303 | context_data = malloc(sizeof(*context_data)); | |
304 | if (!context_data) | |
305 | return -ENOMEM; | |
306 | init_object(context_data); | |
307 | memset(&lum, 0, sizeof(lum)); | |
3039d8ed | 308 | lum.handle = obj_data->handle; |
57773204 MD |
309 | lum.cmd = LTTNG_UST_CONTEXT; |
310 | lum.u.context.ctx = ctx->ctx; | |
311 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
312 | if (ret) { | |
313 | free(context_data); | |
314 | return ret; | |
315 | } | |
316 | context_data->handle = lur.ret_val; | |
317 | DBG("received context handle %u", context_data->handle); | |
318 | *_context_data = context_data; | |
319 | return ret; | |
320 | } | |
321 | ||
322 | /* Enable event, channel and session ioctl */ | |
61f02aea | 323 | int ustctl_enable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
324 | { |
325 | struct ustcomm_ust_msg lum; | |
326 | struct ustcomm_ust_reply lur; | |
327 | int ret; | |
328 | ||
329 | memset(&lum, 0, sizeof(lum)); | |
330 | lum.handle = object->handle; | |
331 | lum.cmd = LTTNG_UST_ENABLE; | |
332 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
333 | if (ret) | |
334 | return ret; | |
335 | DBG("enabled handle %u", object->handle); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | /* Disable event, channel and session ioctl */ | |
61f02aea | 340 | int ustctl_disable(int sock, struct lttng_ust_object_data *object) |
57773204 MD |
341 | { |
342 | struct ustcomm_ust_msg lum; | |
343 | struct ustcomm_ust_reply lur; | |
344 | int ret; | |
345 | ||
346 | memset(&lum, 0, sizeof(lum)); | |
347 | lum.handle = object->handle; | |
348 | lum.cmd = LTTNG_UST_DISABLE; | |
349 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
350 | if (ret) | |
351 | return ret; | |
352 | DBG("disable handle %u", object->handle); | |
353 | return 0; | |
354 | } | |
355 | ||
4a6ca058 | 356 | int ustctl_start_session(int sock, int handle) |
57773204 | 357 | { |
61f02aea | 358 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
359 | |
360 | obj.handle = handle; | |
361 | return ustctl_enable(sock, &obj); | |
57773204 MD |
362 | } |
363 | ||
4a6ca058 | 364 | int ustctl_stop_session(int sock, int handle) |
57773204 | 365 | { |
61f02aea | 366 | struct lttng_ust_object_data obj; |
4a6ca058 MD |
367 | |
368 | obj.handle = handle; | |
369 | return ustctl_disable(sock, &obj); | |
57773204 MD |
370 | } |
371 | ||
372 | ||
373 | int ustctl_tracepoint_list(int sock) | |
374 | { | |
375 | return -ENOSYS; /* not implemented */ | |
376 | } | |
377 | ||
378 | int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v) | |
379 | { | |
380 | struct ustcomm_ust_msg lum; | |
381 | struct ustcomm_ust_reply lur; | |
382 | int ret; | |
383 | ||
384 | memset(&lum, 0, sizeof(lum)); | |
385 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
386 | lum.cmd = LTTNG_UST_TRACER_VERSION; | |
387 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
388 | if (ret) | |
389 | return ret; | |
390 | memcpy(v, &lur.u.version, sizeof(*v)); | |
391 | DBG("received tracer version"); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | int ustctl_wait_quiescent(int sock) | |
396 | { | |
397 | struct ustcomm_ust_msg lum; | |
398 | struct ustcomm_ust_reply lur; | |
399 | int ret; | |
400 | ||
401 | memset(&lum, 0, sizeof(lum)); | |
402 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
403 | lum.cmd = LTTNG_UST_WAIT_QUIESCENT; | |
404 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); | |
405 | if (ret) | |
406 | return ret; | |
407 | DBG("waited for quiescent state"); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate) | |
412 | { | |
413 | return -ENOSYS; | |
414 | } | |
415 | ||
416 | /* Buffer operations */ | |
417 | ||
418 | /* Map channel shm into process memory */ | |
38fae1d3 | 419 | struct lttng_ust_shm_handle *ustctl_map_channel(struct lttng_ust_object_data *chan_data) |
57773204 | 420 | { |
38fae1d3 | 421 | struct lttng_ust_shm_handle *handle; |
57773204 MD |
422 | struct channel *chan; |
423 | size_t chan_size; | |
c1fca457 | 424 | struct lttng_ust_lib_ring_buffer_config *config; |
57773204 MD |
425 | |
426 | handle = channel_handle_create(chan_data->shm_fd, | |
427 | chan_data->wait_fd, | |
428 | chan_data->memory_map_size); | |
429 | if (!handle) { | |
430 | ERR("create handle error"); | |
431 | return NULL; | |
432 | } | |
433 | /* | |
38fae1d3 | 434 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
435 | * of closing shm_fd and wait_fd. |
436 | */ | |
437 | chan_data->shm_fd = -1; | |
438 | chan_data->wait_fd = -1; | |
439 | ||
440 | /* | |
441 | * TODO: add consistency checks to be resilient if the | |
442 | * application try to feed us with incoherent channel structure | |
443 | * values. | |
444 | */ | |
445 | chan = shmp(handle, handle->chan); | |
446 | /* chan is object 0. This is hardcoded. */ | |
447 | chan_size = handle->table->objects[0].allocated_len; | |
448 | handle->shadow_chan = malloc(chan_size); | |
449 | if (!handle->shadow_chan) { | |
450 | channel_destroy(chan, handle, 1); | |
451 | return NULL; | |
452 | } | |
453 | memcpy(handle->shadow_chan, chan, chan_size); | |
bbc70d1b MD |
454 | /* |
455 | * The callback pointers in the producer are invalid in the | |
c1fca457 | 456 | * consumer. We need to look them up here. |
bbc70d1b | 457 | */ |
c1fca457 MD |
458 | config = &handle->shadow_chan->backend.config; |
459 | switch (config->client_type) { | |
460 | case LTTNG_CLIENT_METADATA: | |
461 | memcpy(&config->cb, lttng_client_callbacks_metadata, | |
462 | sizeof(config->cb)); | |
463 | break; | |
464 | case LTTNG_CLIENT_DISCARD: | |
465 | memcpy(&config->cb, lttng_client_callbacks_discard, | |
466 | sizeof(config->cb)); | |
467 | break; | |
468 | case LTTNG_CLIENT_OVERWRITE: | |
469 | memcpy(&config->cb, lttng_client_callbacks_overwrite, | |
470 | sizeof(config->cb)); | |
471 | break; | |
472 | default: | |
473 | ERR("Unknown client type %d", config->client_type); | |
474 | channel_destroy(chan, handle, 1); | |
475 | return NULL; | |
476 | } | |
57773204 MD |
477 | return handle; |
478 | } | |
479 | ||
480 | /* Add stream to channel shm and map its shm into process memory */ | |
38fae1d3 | 481 | int ustctl_add_stream(struct lttng_ust_shm_handle *handle, |
61f02aea | 482 | struct lttng_ust_object_data *stream_data) |
57773204 MD |
483 | { |
484 | int ret; | |
485 | ||
486 | if (!stream_data->handle) | |
487 | return -ENOENT; | |
488 | /* map stream */ | |
489 | ret = channel_handle_add_stream(handle, | |
490 | stream_data->shm_fd, | |
491 | stream_data->wait_fd, | |
492 | stream_data->memory_map_size); | |
493 | if (ret) { | |
494 | ERR("add stream error\n"); | |
495 | return ret; | |
496 | } | |
497 | /* | |
38fae1d3 | 498 | * Set to -1 because the lttng_ust_shm_handle destruction will take care |
57773204 MD |
499 | * of closing shm_fd and wait_fd. |
500 | */ | |
501 | stream_data->shm_fd = -1; | |
502 | stream_data->wait_fd = -1; | |
503 | return 0; | |
504 | } | |
505 | ||
38fae1d3 | 506 | void ustctl_unmap_channel(struct lttng_ust_shm_handle *handle) |
5224b5c8 MD |
507 | { |
508 | struct channel *chan; | |
509 | ||
510 | chan = shmp(handle, handle->chan); | |
511 | channel_destroy(chan, handle, 1); | |
512 | } | |
513 | ||
4cfec15c | 514 | struct lttng_ust_lib_ring_buffer *ustctl_open_stream_read(struct lttng_ust_shm_handle *handle, |
6e922b24 MD |
515 | int cpu) |
516 | { | |
517 | struct channel *chan = handle->shadow_chan; | |
518 | int shm_fd, wait_fd; | |
519 | uint64_t memory_map_size; | |
4cfec15c | 520 | struct lttng_ust_lib_ring_buffer *buf; |
6e922b24 MD |
521 | int ret; |
522 | ||
523 | buf = channel_get_ring_buffer(&chan->backend.config, | |
524 | chan, cpu, handle, &shm_fd, &wait_fd, &memory_map_size); | |
525 | if (!buf) | |
526 | return NULL; | |
527 | ret = lib_ring_buffer_open_read(buf, handle, 1); | |
528 | if (ret) | |
529 | return NULL; | |
530 | return buf; | |
531 | } | |
532 | ||
38fae1d3 | 533 | void ustctl_close_stream_read(struct lttng_ust_shm_handle *handle, |
4cfec15c | 534 | struct lttng_ust_lib_ring_buffer *buf) |
6e922b24 MD |
535 | { |
536 | lib_ring_buffer_release_read(buf, handle, 1); | |
537 | } | |
538 | ||
57773204 MD |
539 | /* For mmap mode, readable without "get" operation */ |
540 | ||
38fae1d3 | 541 | void *ustctl_get_mmap_base(struct lttng_ust_shm_handle *handle, |
4cfec15c | 542 | struct lttng_ust_lib_ring_buffer *buf) |
9095efe9 MD |
543 | { |
544 | return shmp(handle, buf->backend.memory_map); | |
545 | } | |
546 | ||
57773204 | 547 | /* returns the length to mmap. */ |
38fae1d3 | 548 | int ustctl_get_mmap_len(struct lttng_ust_shm_handle *handle, |
4cfec15c | 549 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
550 | unsigned long *len) |
551 | { | |
552 | unsigned long mmap_buf_len; | |
553 | struct channel *chan = handle->shadow_chan; | |
554 | ||
555 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
556 | return -EINVAL; | |
557 | mmap_buf_len = chan->backend.buf_size; | |
558 | if (chan->backend.extra_reader_sb) | |
559 | mmap_buf_len += chan->backend.subbuf_size; | |
560 | if (mmap_buf_len > INT_MAX) | |
561 | return -EFBIG; | |
562 | *len = mmap_buf_len; | |
563 | return 0; | |
564 | } | |
565 | ||
566 | /* returns the maximum size for sub-buffers. */ | |
38fae1d3 | 567 | int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 568 | struct lttng_ust_lib_ring_buffer *buf, |
57773204 MD |
569 | unsigned long *len) |
570 | { | |
571 | struct channel *chan = handle->shadow_chan; | |
572 | ||
573 | *len = chan->backend.subbuf_size; | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * For mmap mode, operate on the current packet (between get/put or | |
579 | * get_next/put_next). | |
580 | */ | |
581 | ||
582 | /* returns the offset of the subbuffer belonging to the mmap reader. */ | |
38fae1d3 | 583 | int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle, |
4cfec15c | 584 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *off) |
57773204 MD |
585 | { |
586 | struct channel *chan = handle->shadow_chan; | |
587 | unsigned long sb_bindex; | |
588 | ||
589 | if (chan->backend.config.output != RING_BUFFER_MMAP) | |
590 | return -EINVAL; | |
591 | sb_bindex = subbuffer_id_get_index(&chan->backend.config, | |
592 | buf->backend.buf_rsb.id); | |
593 | *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset; | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 598 | int ustctl_get_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 599 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
600 | { |
601 | struct channel *chan = handle->shadow_chan; | |
602 | ||
603 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
604 | handle); | |
605 | return 0; | |
606 | } | |
607 | ||
608 | /* returns the size of the current sub-buffer, without padding (for mmap). */ | |
38fae1d3 | 609 | int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle *handle, |
4cfec15c | 610 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *len) |
57773204 MD |
611 | { |
612 | struct channel *chan = handle->shadow_chan; | |
613 | ||
614 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, | |
615 | handle); | |
616 | *len = PAGE_ALIGN(*len); | |
617 | return 0; | |
618 | } | |
619 | ||
620 | /* Get exclusive read access to the next sub-buffer that can be read. */ | |
38fae1d3 | 621 | int ustctl_get_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 622 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
623 | { |
624 | return lib_ring_buffer_get_next_subbuf(buf, handle); | |
625 | } | |
626 | ||
627 | ||
628 | /* Release exclusive sub-buffer access, move consumer forward. */ | |
38fae1d3 | 629 | int ustctl_put_next_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 630 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
631 | { |
632 | lib_ring_buffer_put_next_subbuf(buf, handle); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | /* snapshot */ | |
637 | ||
638 | /* Get a snapshot of the current ring buffer producer and consumer positions */ | |
38fae1d3 | 639 | int ustctl_snapshot(struct lttng_ust_shm_handle *handle, |
4cfec15c | 640 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
641 | { |
642 | return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot, | |
643 | &buf->prod_snapshot, handle); | |
644 | } | |
645 | ||
646 | /* Get the consumer position (iteration start) */ | |
38fae1d3 | 647 | int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle *handle, |
4cfec15c | 648 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
649 | { |
650 | *pos = buf->cons_snapshot; | |
651 | return 0; | |
652 | } | |
653 | ||
654 | /* Get the producer position (iteration end) */ | |
38fae1d3 | 655 | int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle *handle, |
4cfec15c | 656 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
657 | { |
658 | *pos = buf->prod_snapshot; | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* Get exclusive read access to the specified sub-buffer position */ | |
38fae1d3 | 663 | int ustctl_get_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 664 | struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos) |
57773204 MD |
665 | { |
666 | return lib_ring_buffer_get_subbuf(buf, *pos, handle); | |
667 | } | |
668 | ||
669 | /* Release exclusive sub-buffer access */ | |
38fae1d3 | 670 | int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle, |
4cfec15c | 671 | struct lttng_ust_lib_ring_buffer *buf) |
57773204 MD |
672 | { |
673 | lib_ring_buffer_put_subbuf(buf, handle); | |
674 | return 0; | |
675 | } | |
676 | ||
02a15cfb | 677 | void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle, |
b52190f2 MD |
678 | struct lttng_ust_lib_ring_buffer *buf, |
679 | int producer_active) | |
57773204 | 680 | { |
b52190f2 MD |
681 | lib_ring_buffer_switch_slow(buf, |
682 | producer_active ? SWITCH_ACTIVE : SWITCH_FLUSH, | |
683 | handle); | |
57773204 | 684 | } |