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