Commit | Line | Data |
---|---|---|
baf20995 | 1 | /* |
e8951e63 | 2 | * lttng-abi.c |
baf20995 | 3 | * |
e8951e63 | 4 | * LTTng ABI |
baf20995 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | * | |
22 | * | |
baf20995 MD |
23 | * Mimic system calls for: |
24 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
25 | * - channel creation, returns a file descriptor or failure. |
26 | * - Operates on a session file descriptor | |
27 | * - Takes all channel options as parameters. | |
28 | * - stream get, returns a file descriptor or failure. | |
29 | * - Operates on a channel file descriptor. | |
30 | * - stream notifier get, returns a file descriptor or failure. | |
31 | * - Operates on a channel file descriptor. | |
32 | * - event creation, returns a file descriptor or failure. | |
33 | * - Operates on a channel file descriptor | |
34 | * - Takes an event name as parameter | |
35 | * - Takes an instrumentation source as parameter | |
36 | * - e.g. tracepoints, dynamic_probes... | |
37 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
38 | */ |
39 | ||
11b5a3c2 | 40 | #include <linux/module.h> |
e6a17f26 | 41 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
42 | #include <linux/anon_inodes.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/uaccess.h> | |
45 | #include <linux/slab.h> | |
b13f3ebe | 46 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 47 | #include "wrapper/ringbuffer/vfs.h" |
d83004aa JD |
48 | #include "wrapper/ringbuffer/backend.h" |
49 | #include "wrapper/ringbuffer/frontend.h" | |
24cedcfe | 50 | #include "wrapper/poll.h" |
e8951e63 | 51 | #include "lttng-abi.h" |
6dccd6c1 | 52 | #include "lttng-abi-old.h" |
a90917c3 MD |
53 | #include "lttng-events.h" |
54 | #include "lttng-tracer.h" | |
3b731ab1 | 55 | #include "lib/ringbuffer/frontend_types.h" |
baf20995 MD |
56 | |
57 | /* | |
58 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 59 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
60 | */ |
61 | ||
e6a17f26 | 62 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
63 | static const struct file_operations lttng_fops; |
64 | static const struct file_operations lttng_session_fops; | |
65 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 66 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 67 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 68 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 69 | |
a33c9927 MD |
70 | /* |
71 | * Teardown management: opened file descriptors keep a refcount on the module, | |
72 | * so it can only exit when all file descriptors are closed. | |
73 | */ | |
74 | ||
ad1c05e1 | 75 | static |
baf20995 MD |
76 | int lttng_abi_create_session(void) |
77 | { | |
a90917c3 | 78 | struct lttng_session *session; |
c0e31d2e | 79 | struct file *session_file; |
11b5a3c2 | 80 | int session_fd, ret; |
baf20995 | 81 | |
a90917c3 | 82 | session = lttng_session_create(); |
baf20995 MD |
83 | if (!session) |
84 | return -ENOMEM; | |
1c25284c | 85 | session_fd = get_unused_fd(); |
baf20995 MD |
86 | if (session_fd < 0) { |
87 | ret = session_fd; | |
88 | goto fd_error; | |
89 | } | |
c0e31d2e | 90 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 91 | <tng_session_fops, |
baf20995 | 92 | session, O_RDWR); |
c0e31d2e MD |
93 | if (IS_ERR(session_file)) { |
94 | ret = PTR_ERR(session_file); | |
baf20995 MD |
95 | goto file_error; |
96 | } | |
c0e31d2e MD |
97 | session->file = session_file; |
98 | fd_install(session_fd, session_file); | |
baf20995 MD |
99 | return session_fd; |
100 | ||
101 | file_error: | |
102 | put_unused_fd(session_fd); | |
103 | fd_error: | |
a90917c3 | 104 | lttng_session_destroy(session); |
baf20995 MD |
105 | return ret; |
106 | } | |
107 | ||
271b6681 MD |
108 | static |
109 | int lttng_abi_tracepoint_list(void) | |
110 | { | |
111 | struct file *tracepoint_list_file; | |
112 | int file_fd, ret; | |
113 | ||
114 | file_fd = get_unused_fd(); | |
115 | if (file_fd < 0) { | |
116 | ret = file_fd; | |
117 | goto fd_error; | |
118 | } | |
30f18bf0 | 119 | |
271b6681 MD |
120 | tracepoint_list_file = anon_inode_getfile("[lttng_session]", |
121 | <tng_tracepoint_list_fops, | |
122 | NULL, O_RDWR); | |
123 | if (IS_ERR(tracepoint_list_file)) { | |
124 | ret = PTR_ERR(tracepoint_list_file); | |
125 | goto file_error; | |
126 | } | |
30f18bf0 MD |
127 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
128 | if (ret < 0) | |
129 | goto open_error; | |
271b6681 | 130 | fd_install(file_fd, tracepoint_list_file); |
30f18bf0 MD |
131 | if (file_fd < 0) { |
132 | ret = file_fd; | |
133 | goto fd_error; | |
134 | } | |
271b6681 MD |
135 | return file_fd; |
136 | ||
30f18bf0 MD |
137 | open_error: |
138 | fput(tracepoint_list_file); | |
271b6681 MD |
139 | file_error: |
140 | put_unused_fd(file_fd); | |
141 | fd_error: | |
142 | return ret; | |
143 | } | |
144 | ||
80c16bcf | 145 | static |
6dccd6c1 | 146 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 147 | { |
6dccd6c1 JD |
148 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
149 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
150 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
151 | } |
152 | ||
8070f5c0 MD |
153 | static |
154 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 155 | struct lttng_kernel_context *context_param, |
a90917c3 | 156 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 157 | { |
8070f5c0 MD |
158 | |
159 | if (session->been_active) | |
160 | return -EPERM; | |
161 | ||
6dccd6c1 | 162 | switch (context_param->ctx) { |
12a313a5 | 163 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 164 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
165 | case LTTNG_KERNEL_CONTEXT_PRIO: |
166 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
167 | case LTTNG_KERNEL_CONTEXT_NICE: |
168 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
169 | case LTTNG_KERNEL_CONTEXT_VPID: |
170 | return lttng_add_vpid_to_ctx(ctx); | |
171 | case LTTNG_KERNEL_CONTEXT_TID: | |
172 | return lttng_add_tid_to_ctx(ctx); | |
173 | case LTTNG_KERNEL_CONTEXT_VTID: | |
174 | return lttng_add_vtid_to_ctx(ctx); | |
175 | case LTTNG_KERNEL_CONTEXT_PPID: | |
176 | return lttng_add_ppid_to_ctx(ctx); | |
177 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
178 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 179 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
180 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
181 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
182 | context_param->u.perf_counter.config, | |
183 | context_param->u.perf_counter.name, | |
c24a0d71 | 184 | ctx); |
a2563e83 MD |
185 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
186 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
187 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
188 | return lttng_add_hostname_to_ctx(ctx); | |
8070f5c0 MD |
189 | default: |
190 | return -EINVAL; | |
191 | } | |
192 | } | |
193 | ||
ad1c05e1 MD |
194 | /** |
195 | * lttng_ioctl - lttng syscall through ioctl | |
196 | * | |
c0e31d2e | 197 | * @file: the file |
ad1c05e1 MD |
198 | * @cmd: the command |
199 | * @arg: command arg | |
200 | * | |
201 | * This ioctl implements lttng commands: | |
38d024ae | 202 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 203 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
204 | * LTTNG_KERNEL_TRACER_VERSION |
205 | * Returns the LTTng kernel tracer version | |
206 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
207 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
208 | * LTTNG_KERNEL_WAIT_QUIESCENT |
209 | * Returns after all previously running probes have completed | |
ad1c05e1 MD |
210 | * |
211 | * The returned session will be deleted when its file descriptor is closed. | |
212 | */ | |
213 | static | |
c0e31d2e | 214 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
215 | { |
216 | switch (cmd) { | |
6dccd6c1 | 217 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 218 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 219 | return lttng_abi_create_session(); |
6dccd6c1 JD |
220 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
221 | { | |
222 | struct lttng_kernel_tracer_version v; | |
223 | struct lttng_kernel_old_tracer_version oldv; | |
224 | struct lttng_kernel_old_tracer_version *uversion = | |
225 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
226 | ||
227 | lttng_abi_tracer_version(&v); | |
228 | oldv.major = v.major; | |
229 | oldv.minor = v.minor; | |
230 | oldv.patchlevel = v.patchlevel; | |
231 | ||
232 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
233 | return -EFAULT; | |
234 | return 0; | |
235 | } | |
80c16bcf | 236 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
237 | { |
238 | struct lttng_kernel_tracer_version version; | |
239 | struct lttng_kernel_tracer_version *uversion = | |
240 | (struct lttng_kernel_tracer_version __user *) arg; | |
241 | ||
242 | lttng_abi_tracer_version(&version); | |
243 | ||
244 | if (copy_to_user(uversion, &version, sizeof(version))) | |
245 | return -EFAULT; | |
246 | return 0; | |
247 | } | |
248 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
249 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
250 | return lttng_abi_tracepoint_list(); | |
6dccd6c1 | 251 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
252 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
253 | synchronize_trace(); | |
254 | return 0; | |
6dccd6c1 JD |
255 | case LTTNG_KERNEL_OLD_CALIBRATE: |
256 | { | |
257 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
258 | (struct lttng_kernel_old_calibrate __user *) arg; | |
259 | struct lttng_kernel_old_calibrate old_calibrate; | |
260 | struct lttng_kernel_calibrate calibrate; | |
261 | int ret; | |
262 | ||
263 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
264 | return -EFAULT; | |
265 | calibrate.type = old_calibrate.type; | |
266 | ret = lttng_calibrate(&calibrate); | |
267 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
268 | return -EFAULT; | |
269 | return ret; | |
270 | } | |
57105fc2 MD |
271 | case LTTNG_KERNEL_CALIBRATE: |
272 | { | |
3db41b2c MD |
273 | struct lttng_kernel_calibrate __user *ucalibrate = |
274 | (struct lttng_kernel_calibrate __user *) arg; | |
275 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
276 | int ret; |
277 | ||
278 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
279 | return -EFAULT; | |
280 | ret = lttng_calibrate(&calibrate); | |
281 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
282 | return -EFAULT; | |
283 | return ret; | |
284 | } | |
ad1c05e1 MD |
285 | default: |
286 | return -ENOIOCTLCMD; | |
287 | } | |
288 | } | |
289 | ||
ad1c05e1 | 290 | static const struct file_operations lttng_fops = { |
a33c9927 | 291 | .owner = THIS_MODULE, |
ad1c05e1 MD |
292 | .unlocked_ioctl = lttng_ioctl, |
293 | #ifdef CONFIG_COMPAT | |
03037b98 | 294 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 295 | #endif |
11b5a3c2 | 296 | }; |
ad1c05e1 | 297 | |
5dbbdb43 | 298 | static |
c0e31d2e | 299 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 300 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 301 | enum channel_type channel_type) |
baf20995 | 302 | { |
a90917c3 | 303 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 304 | const struct file_operations *fops = NULL; |
5dbbdb43 | 305 | const char *transport_name; |
a90917c3 | 306 | struct lttng_channel *chan; |
c0e31d2e | 307 | struct file *chan_file; |
baf20995 | 308 | int chan_fd; |
ad1c05e1 | 309 | int ret = 0; |
baf20995 | 310 | |
1c25284c | 311 | chan_fd = get_unused_fd(); |
baf20995 MD |
312 | if (chan_fd < 0) { |
313 | ret = chan_fd; | |
314 | goto fd_error; | |
315 | } | |
88dfd899 MD |
316 | switch (channel_type) { |
317 | case PER_CPU_CHANNEL: | |
318 | fops = <tng_channel_fops; | |
319 | break; | |
320 | case METADATA_CHANNEL: | |
321 | fops = <tng_metadata_fops; | |
322 | break; | |
323 | } | |
324 | ||
c0e31d2e | 325 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 326 | fops, |
03037b98 | 327 | NULL, O_RDWR); |
c0e31d2e MD |
328 | if (IS_ERR(chan_file)) { |
329 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
330 | goto file_error; |
331 | } | |
5dbbdb43 MD |
332 | switch (channel_type) { |
333 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
334 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
335 | transport_name = chan_param->overwrite ? | |
96ba7208 | 336 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
337 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
338 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
339 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
340 | } else { | |
341 | return -EINVAL; | |
342 | } | |
5dbbdb43 | 343 | break; |
5dbbdb43 | 344 | case METADATA_CHANNEL: |
6dccd6c1 | 345 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 346 | transport_name = "relay-metadata"; |
6dccd6c1 | 347 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
348 | transport_name = "relay-metadata-mmap"; |
349 | else | |
350 | return -EINVAL; | |
5dbbdb43 MD |
351 | break; |
352 | default: | |
353 | transport_name = "<unknown>"; | |
354 | break; | |
355 | } | |
03037b98 MD |
356 | /* |
357 | * We tolerate no failure path after channel creation. It will stay | |
358 | * invariant for the rest of the session. | |
359 | */ | |
a90917c3 | 360 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
361 | chan_param->subbuf_size, |
362 | chan_param->num_subbuf, | |
363 | chan_param->switch_timer_interval, | |
d83004aa JD |
364 | chan_param->read_timer_interval, |
365 | channel_type); | |
03037b98 | 366 | if (!chan) { |
f3d01b96 | 367 | ret = -EINVAL; |
03037b98 MD |
368 | goto chan_error; |
369 | } | |
11b5a3c2 | 370 | chan->file = chan_file; |
c0e31d2e MD |
371 | chan_file->private_data = chan; |
372 | fd_install(chan_fd, chan_file); | |
b0caa15a | 373 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 374 | |
baf20995 MD |
375 | return chan_fd; |
376 | ||
03037b98 | 377 | chan_error: |
c0e31d2e | 378 | fput(chan_file); |
baf20995 MD |
379 | file_error: |
380 | put_unused_fd(chan_fd); | |
381 | fd_error: | |
baf20995 MD |
382 | return ret; |
383 | } | |
384 | ||
385 | /** | |
ad1c05e1 | 386 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 387 | * |
c0e31d2e | 388 | * @file: the file |
baf20995 MD |
389 | * @cmd: the command |
390 | * @arg: command arg | |
391 | * | |
392 | * This ioctl implements lttng commands: | |
38d024ae | 393 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 394 | * Returns a LTTng channel file descriptor |
e64957da MD |
395 | * LTTNG_KERNEL_ENABLE |
396 | * Enables tracing for a session (weak enable) | |
397 | * LTTNG_KERNEL_DISABLE | |
398 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
399 | * LTTNG_KERNEL_METADATA |
400 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
401 | * |
402 | * The returned channel will be deleted when its file descriptor is closed. | |
403 | */ | |
404 | static | |
c0e31d2e | 405 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 406 | { |
a90917c3 | 407 | struct lttng_session *session = file->private_data; |
c0e31d2e | 408 | |
ad1c05e1 | 409 | switch (cmd) { |
6dccd6c1 JD |
410 | case LTTNG_KERNEL_OLD_CHANNEL: |
411 | { | |
412 | struct lttng_kernel_channel chan_param; | |
413 | struct lttng_kernel_old_channel old_chan_param; | |
414 | ||
415 | if (copy_from_user(&old_chan_param, | |
416 | (struct lttng_kernel_old_channel __user *) arg, | |
417 | sizeof(struct lttng_kernel_old_channel))) | |
418 | return -EFAULT; | |
419 | chan_param.overwrite = old_chan_param.overwrite; | |
420 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
421 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
422 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
423 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
424 | chan_param.output = old_chan_param.output; | |
425 | ||
426 | return lttng_abi_create_channel(file, &chan_param, | |
427 | PER_CPU_CHANNEL); | |
428 | } | |
38d024ae | 429 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
430 | { |
431 | struct lttng_kernel_channel chan_param; | |
432 | ||
433 | if (copy_from_user(&chan_param, | |
38d024ae | 434 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
435 | sizeof(struct lttng_kernel_channel))) |
436 | return -EFAULT; | |
437 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 438 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
439 | } |
440 | case LTTNG_KERNEL_OLD_SESSION_START: | |
441 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 442 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 443 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 444 | return lttng_session_enable(session); |
6dccd6c1 JD |
445 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
446 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 447 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 448 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 449 | return lttng_session_disable(session); |
6dccd6c1 JD |
450 | case LTTNG_KERNEL_OLD_METADATA: |
451 | { | |
452 | struct lttng_kernel_channel chan_param; | |
453 | struct lttng_kernel_old_channel old_chan_param; | |
454 | ||
455 | if (copy_from_user(&old_chan_param, | |
456 | (struct lttng_kernel_old_channel __user *) arg, | |
457 | sizeof(struct lttng_kernel_old_channel))) | |
458 | return -EFAULT; | |
459 | chan_param.overwrite = old_chan_param.overwrite; | |
460 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
461 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
462 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
463 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
464 | chan_param.output = old_chan_param.output; | |
465 | ||
466 | return lttng_abi_create_channel(file, &chan_param, | |
467 | METADATA_CHANNEL); | |
468 | } | |
38d024ae | 469 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
470 | { |
471 | struct lttng_kernel_channel chan_param; | |
472 | ||
473 | if (copy_from_user(&chan_param, | |
474 | (struct lttng_kernel_channel __user *) arg, | |
475 | sizeof(struct lttng_kernel_channel))) | |
476 | return -EFAULT; | |
477 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 478 | METADATA_CHANNEL); |
6dccd6c1 | 479 | } |
ad1c05e1 MD |
480 | default: |
481 | return -ENOIOCTLCMD; | |
482 | } | |
483 | } | |
484 | ||
03037b98 MD |
485 | /* |
486 | * Called when the last file reference is dropped. | |
487 | * | |
488 | * Big fat note: channels and events are invariant for the whole session after | |
489 | * their creation. So this session destruction also destroys all channel and | |
490 | * event structures specific to this session (they are not destroyed when their | |
491 | * individual file is released). | |
492 | */ | |
ad1c05e1 | 493 | static |
03037b98 | 494 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 495 | { |
a90917c3 | 496 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
497 | |
498 | if (session) | |
a90917c3 | 499 | lttng_session_destroy(session); |
11b5a3c2 | 500 | return 0; |
ad1c05e1 | 501 | } |
ad1c05e1 MD |
502 | |
503 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 504 | .owner = THIS_MODULE, |
03037b98 | 505 | .release = lttng_session_release, |
ad1c05e1 MD |
506 | .unlocked_ioctl = lttng_session_ioctl, |
507 | #ifdef CONFIG_COMPAT | |
03037b98 | 508 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 509 | #endif |
11b5a3c2 | 510 | }; |
ad1c05e1 | 511 | |
d83004aa JD |
512 | /** |
513 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
514 | * @filp: the file | |
515 | * @wait: poll table | |
516 | * | |
517 | * Handles the poll operations for the metadata channels. | |
518 | */ | |
ad1c05e1 | 519 | static |
d83004aa JD |
520 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
521 | poll_table *wait) | |
522 | { | |
523 | struct lttng_metadata_stream *stream = filp->private_data; | |
524 | struct lib_ring_buffer *buf = stream->priv; | |
525 | int finalized; | |
526 | unsigned int mask = 0; | |
527 | ||
528 | if (filp->f_mode & FMODE_READ) { | |
529 | poll_wait_set_exclusive(wait); | |
530 | poll_wait(filp, &stream->read_wait, wait); | |
531 | ||
532 | finalized = stream->finalized; | |
533 | ||
534 | /* | |
535 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
536 | * ordering finalized load before offsets loads. | |
537 | */ | |
538 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
539 | ||
540 | if (finalized) | |
541 | mask |= POLLHUP; | |
542 | ||
543 | if (stream->metadata_cache->metadata_written > | |
f613e3e6 | 544 | stream->metadata_out) |
d83004aa JD |
545 | mask |= POLLIN; |
546 | } | |
547 | ||
548 | return mask; | |
549 | } | |
550 | ||
f613e3e6 MD |
551 | static |
552 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
553 | unsigned int cmd, unsigned long arg) | |
554 | { | |
555 | struct lttng_metadata_stream *stream = filp->private_data; | |
556 | ||
557 | stream->metadata_out = stream->metadata_in; | |
558 | } | |
559 | ||
d83004aa JD |
560 | static |
561 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
562 | unsigned int cmd, unsigned long arg) | |
563 | { | |
564 | int ret; | |
565 | struct lttng_metadata_stream *stream = filp->private_data; | |
566 | struct lib_ring_buffer *buf = stream->priv; | |
567 | ||
568 | switch (cmd) { | |
d83004aa JD |
569 | case RING_BUFFER_GET_NEXT_SUBBUF: |
570 | { | |
35097f36 JD |
571 | struct lttng_metadata_stream *stream = filp->private_data; |
572 | struct lib_ring_buffer *buf = stream->priv; | |
573 | struct channel *chan = buf->backend.chan; | |
574 | ||
575 | ret = lttng_metadata_output_channel(stream, chan); | |
576 | if (ret > 0) { | |
577 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
578 | ret = 0; | |
579 | } else if (ret < 0) | |
d83004aa JD |
580 | goto err; |
581 | break; | |
582 | } | |
f613e3e6 MD |
583 | case RING_BUFFER_GET_SUBBUF: |
584 | { | |
585 | /* | |
586 | * Random access is not allowed for metadata channel. | |
587 | */ | |
588 | return -ENOSYS; | |
589 | } | |
35097f36 JD |
590 | case RING_BUFFER_FLUSH: |
591 | { | |
592 | struct lttng_metadata_stream *stream = filp->private_data; | |
593 | struct lib_ring_buffer *buf = stream->priv; | |
594 | struct channel *chan = buf->backend.chan; | |
595 | ||
596 | /* | |
597 | * Before doing the actual ring buffer flush, write up to one | |
598 | * packet of metadata in the ring buffer. | |
599 | */ | |
600 | ret = lttng_metadata_output_channel(stream, chan); | |
601 | if (ret < 0) | |
602 | goto err; | |
603 | break; | |
604 | } | |
d83004aa JD |
605 | default: |
606 | break; | |
607 | } | |
f613e3e6 MD |
608 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
609 | ||
d83004aa | 610 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
611 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
612 | if (ret < 0) | |
613 | goto err; | |
d83004aa | 614 | |
f613e3e6 MD |
615 | switch (cmd) { |
616 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
617 | { | |
618 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
619 | cmd, arg); | |
620 | break; | |
621 | } | |
622 | default: | |
623 | break; | |
624 | } | |
d83004aa JD |
625 | err: |
626 | return ret; | |
627 | } | |
628 | ||
aeb9064d | 629 | #ifdef CONFIG_COMPAT |
d83004aa JD |
630 | static |
631 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
632 | unsigned int cmd, unsigned long arg) | |
633 | { | |
634 | int ret; | |
635 | struct lttng_metadata_stream *stream = filp->private_data; | |
636 | struct lib_ring_buffer *buf = stream->priv; | |
637 | ||
638 | switch (cmd) { | |
d83004aa JD |
639 | case RING_BUFFER_GET_NEXT_SUBBUF: |
640 | { | |
35097f36 JD |
641 | struct lttng_metadata_stream *stream = filp->private_data; |
642 | struct lib_ring_buffer *buf = stream->priv; | |
643 | struct channel *chan = buf->backend.chan; | |
644 | ||
645 | ret = lttng_metadata_output_channel(stream, chan); | |
646 | if (ret > 0) { | |
647 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
648 | ret = 0; | |
649 | } else if (ret < 0) | |
d83004aa JD |
650 | goto err; |
651 | break; | |
652 | } | |
f613e3e6 MD |
653 | case RING_BUFFER_GET_SUBBUF: |
654 | { | |
655 | /* | |
656 | * Random access is not allowed for metadata channel. | |
657 | */ | |
658 | return -ENOSYS; | |
659 | } | |
d83004aa JD |
660 | default: |
661 | break; | |
662 | } | |
f613e3e6 MD |
663 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
664 | ||
d83004aa | 665 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
666 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
667 | if (ret < 0) | |
668 | goto err; | |
d83004aa | 669 | |
f613e3e6 MD |
670 | switch (cmd) { |
671 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
672 | { | |
673 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
674 | cmd, arg); | |
675 | break; | |
676 | } | |
677 | default: | |
678 | break; | |
679 | } | |
d83004aa JD |
680 | err: |
681 | return ret; | |
682 | } | |
aeb9064d | 683 | #endif |
d83004aa | 684 | |
b3b8072b MD |
685 | /* |
686 | * This is not used by anonymous file descriptors. This code is left | |
687 | * there if we ever want to implement an inode with open() operation. | |
688 | */ | |
d83004aa JD |
689 | static |
690 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
691 | { | |
692 | struct lttng_metadata_stream *stream = inode->i_private; | |
693 | struct lib_ring_buffer *buf = stream->priv; | |
694 | ||
695 | file->private_data = buf; | |
b3b8072b MD |
696 | /* |
697 | * Since life-time of metadata cache differs from that of | |
698 | * session, we need to keep our own reference on the transport. | |
699 | */ | |
700 | if (!try_module_get(stream->transport->owner)) { | |
701 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
702 | return -EBUSY; | |
703 | } | |
d83004aa JD |
704 | return lib_ring_buffer_open(inode, file, buf); |
705 | } | |
706 | ||
707 | static | |
708 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
709 | { | |
710 | struct lttng_metadata_stream *stream = file->private_data; | |
711 | struct lib_ring_buffer *buf = stream->priv; | |
712 | ||
713 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 714 | module_put(stream->transport->owner); |
d83004aa JD |
715 | return lib_ring_buffer_release(inode, file, buf); |
716 | } | |
717 | ||
718 | static | |
719 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
720 | struct pipe_inode_info *pipe, size_t len, | |
721 | unsigned int flags) | |
722 | { | |
723 | struct lttng_metadata_stream *stream = in->private_data; | |
724 | struct lib_ring_buffer *buf = stream->priv; | |
725 | ||
726 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
727 | flags, buf); | |
728 | } | |
729 | ||
730 | static | |
731 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
732 | struct vm_area_struct *vma) | |
733 | { | |
734 | struct lttng_metadata_stream *stream = filp->private_data; | |
735 | struct lib_ring_buffer *buf = stream->priv; | |
736 | ||
737 | return lib_ring_buffer_mmap(filp, vma, buf); | |
738 | } | |
739 | ||
740 | static | |
741 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
742 | .owner = THIS_MODULE, | |
743 | .open = lttng_metadata_ring_buffer_open, | |
744 | .release = lttng_metadata_ring_buffer_release, | |
745 | .poll = lttng_metadata_ring_buffer_poll, | |
746 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
747 | .mmap = lttng_metadata_ring_buffer_mmap, | |
748 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
749 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
750 | #ifdef CONFIG_COMPAT | |
751 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
752 | #endif | |
753 | }; | |
754 | ||
755 | static | |
756 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
757 | const struct file_operations *fops) | |
ad1c05e1 | 758 | { |
ad1c05e1 | 759 | int stream_fd, ret; |
11b5a3c2 | 760 | struct file *stream_file; |
ad1c05e1 | 761 | |
1c25284c | 762 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
763 | if (stream_fd < 0) { |
764 | ret = stream_fd; | |
765 | goto fd_error; | |
766 | } | |
d83004aa JD |
767 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
768 | stream_priv, O_RDWR); | |
c0e31d2e MD |
769 | if (IS_ERR(stream_file)) { |
770 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
771 | goto file_error; |
772 | } | |
409453cb MD |
773 | /* |
774 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
775 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
776 | * file descriptor, so we set FMODE_PREAD here. | |
777 | */ | |
d7b6f197 | 778 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 779 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
780 | /* |
781 | * The stream holds a reference to the channel within the generic ring | |
782 | * buffer library, so no need to hold a refcount on the channel and | |
783 | * session files here. | |
784 | */ | |
ad1c05e1 MD |
785 | return stream_fd; |
786 | ||
787 | file_error: | |
788 | put_unused_fd(stream_fd); | |
d83004aa JD |
789 | fd_error: |
790 | return ret; | |
791 | } | |
792 | ||
793 | static | |
794 | int lttng_abi_open_stream(struct file *channel_file) | |
795 | { | |
796 | struct lttng_channel *channel = channel_file->private_data; | |
797 | struct lib_ring_buffer *buf; | |
798 | int ret; | |
799 | void *stream_priv; | |
800 | ||
801 | buf = channel->ops->buffer_read_open(channel->chan); | |
802 | if (!buf) | |
803 | return -ENOENT; | |
804 | ||
805 | stream_priv = buf; | |
806 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 807 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
808 | if (ret < 0) |
809 | goto fd_error; | |
810 | ||
811 | return ret; | |
812 | ||
813 | fd_error: | |
814 | channel->ops->buffer_read_close(buf); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | static | |
819 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
820 | { | |
821 | struct lttng_channel *channel = channel_file->private_data; | |
822 | struct lttng_session *session = channel->session; | |
823 | struct lib_ring_buffer *buf; | |
824 | int ret; | |
825 | struct lttng_metadata_stream *metadata_stream; | |
826 | void *stream_priv; | |
827 | ||
828 | buf = channel->ops->buffer_read_open(channel->chan); | |
829 | if (!buf) | |
830 | return -ENOENT; | |
831 | ||
832 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
833 | GFP_KERNEL); | |
b3b8072b MD |
834 | if (!metadata_stream) { |
835 | ret = -ENOMEM; | |
836 | goto nomem; | |
837 | } | |
d83004aa JD |
838 | metadata_stream->metadata_cache = session->metadata_cache; |
839 | init_waitqueue_head(&metadata_stream->read_wait); | |
840 | metadata_stream->priv = buf; | |
841 | stream_priv = metadata_stream; | |
b3b8072b MD |
842 | metadata_stream->transport = channel->transport; |
843 | ||
844 | /* | |
845 | * Since life-time of metadata cache differs from that of | |
846 | * session, we need to keep our own reference on the transport. | |
847 | */ | |
848 | if (!try_module_get(metadata_stream->transport->owner)) { | |
849 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
850 | ret = -EINVAL; | |
851 | goto notransport; | |
852 | } | |
853 | ||
d83004aa JD |
854 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
855 | <tng_metadata_ring_buffer_file_operations); | |
856 | if (ret < 0) | |
857 | goto fd_error; | |
858 | ||
859 | kref_get(&session->metadata_cache->refcount); | |
860 | list_add(&metadata_stream->list, | |
861 | &session->metadata_cache->metadata_stream); | |
862 | return ret; | |
863 | ||
ad1c05e1 | 864 | fd_error: |
b3b8072b MD |
865 | module_put(metadata_stream->transport->owner); |
866 | notransport: | |
867 | kfree(metadata_stream); | |
868 | nomem: | |
11b5a3c2 | 869 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
870 | return ret; |
871 | } | |
872 | ||
653fe716 | 873 | static |
c0e31d2e | 874 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 875 | struct lttng_kernel_event *event_param) |
653fe716 | 876 | { |
a90917c3 MD |
877 | struct lttng_channel *channel = channel_file->private_data; |
878 | struct lttng_event *event; | |
653fe716 | 879 | int event_fd, ret; |
11b5a3c2 | 880 | struct file *event_file; |
653fe716 | 881 | |
6dccd6c1 JD |
882 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
883 | switch (event_param->instrumentation) { | |
7371f44c | 884 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 885 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 886 | break; |
ab2277d6 | 887 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 888 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 889 | break; |
ab2277d6 | 890 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 891 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
892 | break; |
893 | default: | |
894 | break; | |
895 | } | |
6dccd6c1 | 896 | switch (event_param->instrumentation) { |
1ec65de1 MD |
897 | default: |
898 | event_fd = get_unused_fd(); | |
899 | if (event_fd < 0) { | |
900 | ret = event_fd; | |
901 | goto fd_error; | |
902 | } | |
903 | event_file = anon_inode_getfile("[lttng_event]", | |
904 | <tng_event_fops, | |
905 | NULL, O_RDWR); | |
906 | if (IS_ERR(event_file)) { | |
907 | ret = PTR_ERR(event_file); | |
908 | goto file_error; | |
909 | } | |
910 | /* | |
911 | * We tolerate no failure path after event creation. It | |
912 | * will stay invariant for the rest of the session. | |
913 | */ | |
6dccd6c1 | 914 | event = lttng_event_create(channel, event_param, NULL, NULL); |
1ec65de1 MD |
915 | if (!event) { |
916 | ret = -EINVAL; | |
917 | goto event_error; | |
918 | } | |
919 | event_file->private_data = event; | |
920 | fd_install(event_fd, event_file); | |
921 | /* The event holds a reference on the channel */ | |
922 | atomic_long_inc(&channel_file->f_count); | |
923 | break; | |
43880ee8 MD |
924 | case LTTNG_KERNEL_SYSCALL: |
925 | /* | |
926 | * Only all-syscall tracing supported for now. | |
927 | */ | |
6dccd6c1 | 928 | if (event_param->name[0] != '\0') |
43880ee8 | 929 | return -EINVAL; |
1ec65de1 MD |
930 | ret = lttng_syscalls_register(channel, NULL); |
931 | if (ret) | |
932 | goto fd_error; | |
933 | event_fd = 0; | |
934 | break; | |
03037b98 | 935 | } |
653fe716 MD |
936 | return event_fd; |
937 | ||
03037b98 | 938 | event_error: |
c0e31d2e | 939 | fput(event_file); |
653fe716 MD |
940 | file_error: |
941 | put_unused_fd(event_fd); | |
942 | fd_error: | |
653fe716 MD |
943 | return ret; |
944 | } | |
ad1c05e1 MD |
945 | |
946 | /** | |
947 | * lttng_channel_ioctl - lttng syscall through ioctl | |
948 | * | |
c0e31d2e | 949 | * @file: the file |
ad1c05e1 MD |
950 | * @cmd: the command |
951 | * @arg: command arg | |
952 | * | |
953 | * This ioctl implements lttng commands: | |
38d024ae | 954 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
955 | * Returns an event stream file descriptor or failure. |
956 | * (typically, one event stream records events from one CPU) | |
38d024ae | 957 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 958 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
959 | * LTTNG_KERNEL_CONTEXT |
960 | * Prepend a context field to each event in the channel | |
e64957da MD |
961 | * LTTNG_KERNEL_ENABLE |
962 | * Enable recording for events in this channel (weak enable) | |
963 | * LTTNG_KERNEL_DISABLE | |
964 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 965 | * |
baf20995 MD |
966 | * Channel and event file descriptors also hold a reference on the session. |
967 | */ | |
ad1c05e1 | 968 | static |
c0e31d2e | 969 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 970 | { |
a90917c3 | 971 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 972 | |
baf20995 | 973 | switch (cmd) { |
6dccd6c1 | 974 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 975 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 976 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
977 | case LTTNG_KERNEL_OLD_EVENT: |
978 | { | |
979 | struct lttng_kernel_event *uevent_param; | |
980 | struct lttng_kernel_old_event *old_uevent_param; | |
981 | int ret; | |
982 | ||
983 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
984 | GFP_KERNEL); | |
985 | if (!uevent_param) { | |
986 | ret = -ENOMEM; | |
987 | goto old_event_end; | |
988 | } | |
989 | old_uevent_param = kmalloc( | |
990 | sizeof(struct lttng_kernel_old_event), | |
991 | GFP_KERNEL); | |
992 | if (!old_uevent_param) { | |
993 | ret = -ENOMEM; | |
994 | goto old_event_error_free_param; | |
995 | } | |
996 | if (copy_from_user(old_uevent_param, | |
997 | (struct lttng_kernel_old_event __user *) arg, | |
998 | sizeof(struct lttng_kernel_old_event))) { | |
999 | ret = -EFAULT; | |
1000 | goto old_event_error_free_old_param; | |
1001 | } | |
1002 | ||
1003 | memcpy(uevent_param->name, old_uevent_param->name, | |
1004 | sizeof(uevent_param->name)); | |
1005 | uevent_param->instrumentation = | |
1006 | old_uevent_param->instrumentation; | |
1007 | ||
1008 | switch (old_uevent_param->instrumentation) { | |
1009 | case LTTNG_KERNEL_KPROBE: | |
1010 | uevent_param->u.kprobe.addr = | |
1011 | old_uevent_param->u.kprobe.addr; | |
1012 | uevent_param->u.kprobe.offset = | |
1013 | old_uevent_param->u.kprobe.offset; | |
1014 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1015 | old_uevent_param->u.kprobe.symbol_name, | |
1016 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1017 | break; | |
1018 | case LTTNG_KERNEL_KRETPROBE: | |
1019 | uevent_param->u.kretprobe.addr = | |
1020 | old_uevent_param->u.kretprobe.addr; | |
1021 | uevent_param->u.kretprobe.offset = | |
1022 | old_uevent_param->u.kretprobe.offset; | |
1023 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1024 | old_uevent_param->u.kretprobe.symbol_name, | |
1025 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1026 | break; | |
1027 | case LTTNG_KERNEL_FUNCTION: | |
1028 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1029 | old_uevent_param->u.ftrace.symbol_name, | |
1030 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1031 | break; | |
1032 | default: | |
1033 | break; | |
1034 | } | |
1035 | ret = lttng_abi_create_event(file, uevent_param); | |
1036 | ||
1037 | old_event_error_free_old_param: | |
1038 | kfree(old_uevent_param); | |
1039 | old_event_error_free_param: | |
1040 | kfree(uevent_param); | |
1041 | old_event_end: | |
1042 | return ret; | |
1043 | } | |
38d024ae | 1044 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1045 | { |
1046 | struct lttng_kernel_event uevent_param; | |
1047 | ||
1048 | if (copy_from_user(&uevent_param, | |
1049 | (struct lttng_kernel_event __user *) arg, | |
1050 | sizeof(uevent_param))) | |
1051 | return -EFAULT; | |
1052 | return lttng_abi_create_event(file, &uevent_param); | |
1053 | } | |
1054 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1055 | { | |
1056 | struct lttng_kernel_context *ucontext_param; | |
1057 | struct lttng_kernel_old_context *old_ucontext_param; | |
1058 | int ret; | |
1059 | ||
1060 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1061 | GFP_KERNEL); | |
1062 | if (!ucontext_param) { | |
1063 | ret = -ENOMEM; | |
1064 | goto old_ctx_end; | |
1065 | } | |
1066 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1067 | GFP_KERNEL); | |
1068 | if (!old_ucontext_param) { | |
1069 | ret = -ENOMEM; | |
1070 | goto old_ctx_error_free_param; | |
1071 | } | |
1072 | ||
1073 | if (copy_from_user(old_ucontext_param, | |
1074 | (struct lttng_kernel_old_context __user *) arg, | |
1075 | sizeof(struct lttng_kernel_old_context))) { | |
1076 | ret = -EFAULT; | |
1077 | goto old_ctx_error_free_old_param; | |
1078 | } | |
1079 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1080 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1081 | sizeof(ucontext_param->padding)); | |
1082 | /* only type that uses the union */ | |
1083 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1084 | ucontext_param->u.perf_counter.type = | |
1085 | old_ucontext_param->u.perf_counter.type; | |
1086 | ucontext_param->u.perf_counter.config = | |
1087 | old_ucontext_param->u.perf_counter.config; | |
1088 | memcpy(ucontext_param->u.perf_counter.name, | |
1089 | old_ucontext_param->u.perf_counter.name, | |
1090 | sizeof(ucontext_param->u.perf_counter.name)); | |
1091 | } | |
1092 | ||
1093 | ret = lttng_abi_add_context(file, | |
1094 | ucontext_param, | |
1095 | &channel->ctx, channel->session); | |
1096 | ||
1097 | old_ctx_error_free_old_param: | |
1098 | kfree(old_ucontext_param); | |
1099 | old_ctx_error_free_param: | |
1100 | kfree(ucontext_param); | |
1101 | old_ctx_end: | |
1102 | return ret; | |
1103 | } | |
8070f5c0 | 1104 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1105 | { |
1106 | struct lttng_kernel_context ucontext_param; | |
1107 | ||
1108 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1109 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1110 | sizeof(ucontext_param))) |
1111 | return -EFAULT; | |
1112 | return lttng_abi_add_context(file, | |
1113 | &ucontext_param, | |
8070f5c0 | 1114 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1115 | } |
1116 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1117 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1118 | return lttng_channel_enable(channel); |
6dccd6c1 | 1119 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1120 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1121 | return lttng_channel_disable(channel); |
baf20995 MD |
1122 | default: |
1123 | return -ENOIOCTLCMD; | |
1124 | } | |
6dccd6c1 | 1125 | |
baf20995 MD |
1126 | } |
1127 | ||
5dbbdb43 MD |
1128 | /** |
1129 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1130 | * | |
1131 | * @file: the file | |
1132 | * @cmd: the command | |
1133 | * @arg: command arg | |
1134 | * | |
1135 | * This ioctl implements lttng commands: | |
38d024ae | 1136 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1137 | * Returns an event stream file descriptor or failure. |
1138 | * | |
1139 | * Channel and event file descriptors also hold a reference on the session. | |
1140 | */ | |
1141 | static | |
1142 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1143 | { | |
1144 | switch (cmd) { | |
6dccd6c1 | 1145 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1146 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1147 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1148 | default: |
1149 | return -ENOIOCTLCMD; | |
1150 | } | |
1151 | } | |
1152 | ||
653fe716 MD |
1153 | /** |
1154 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1155 | * | |
c0e31d2e | 1156 | * @file: the file |
653fe716 MD |
1157 | * @wait: poll table |
1158 | */ | |
c0e31d2e | 1159 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1160 | { |
a90917c3 | 1161 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1162 | unsigned int mask = 0; |
1163 | ||
c0e31d2e | 1164 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1165 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1166 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1167 | wait); | |
653fe716 | 1168 | |
254ec7bc MD |
1169 | if (channel->ops->is_disabled(channel->chan)) |
1170 | return POLLERR; | |
24cedcfe | 1171 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1172 | return POLLHUP; |
f71ecafa | 1173 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1174 | return POLLIN | POLLRDNORM; |
f71ecafa | 1175 | return 0; |
653fe716 MD |
1176 | } |
1177 | return mask; | |
1178 | ||
1179 | } | |
1180 | ||
0a84a57f MD |
1181 | static |
1182 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1183 | { | |
a90917c3 | 1184 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1185 | |
1186 | if (channel) | |
1187 | fput(channel->session->file); | |
0a84a57f MD |
1188 | return 0; |
1189 | } | |
1190 | ||
d83004aa JD |
1191 | static |
1192 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1193 | { | |
1194 | struct lttng_channel *channel = file->private_data; | |
1195 | ||
1196 | if (channel) { | |
1197 | lttng_metadata_channel_destroy(channel); | |
1198 | fput(channel->session->file); | |
1199 | } | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
ad1c05e1 | 1204 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1205 | .owner = THIS_MODULE, |
03037b98 | 1206 | .release = lttng_channel_release, |
653fe716 | 1207 | .poll = lttng_channel_poll, |
ad1c05e1 | 1208 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1209 | #ifdef CONFIG_COMPAT |
03037b98 | 1210 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1211 | #endif |
11b5a3c2 | 1212 | }; |
baf20995 | 1213 | |
5dbbdb43 | 1214 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1215 | .owner = THIS_MODULE, |
d83004aa | 1216 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1217 | .unlocked_ioctl = lttng_metadata_ioctl, |
1218 | #ifdef CONFIG_COMPAT | |
1219 | .compat_ioctl = lttng_metadata_ioctl, | |
1220 | #endif | |
1221 | }; | |
1222 | ||
8070f5c0 MD |
1223 | /** |
1224 | * lttng_event_ioctl - lttng syscall through ioctl | |
1225 | * | |
1226 | * @file: the file | |
1227 | * @cmd: the command | |
1228 | * @arg: command arg | |
1229 | * | |
1230 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1231 | * LTTNG_KERNEL_CONTEXT |
1232 | * Prepend a context field to each record of this event | |
e64957da MD |
1233 | * LTTNG_KERNEL_ENABLE |
1234 | * Enable recording for this event (weak enable) | |
1235 | * LTTNG_KERNEL_DISABLE | |
1236 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1237 | */ |
1238 | static | |
1239 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1240 | { | |
a90917c3 | 1241 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
1242 | |
1243 | switch (cmd) { | |
6dccd6c1 JD |
1244 | case LTTNG_KERNEL_OLD_CONTEXT: |
1245 | { | |
1246 | struct lttng_kernel_context *ucontext_param; | |
1247 | struct lttng_kernel_old_context *old_ucontext_param; | |
1248 | int ret; | |
1249 | ||
1250 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1251 | GFP_KERNEL); | |
1252 | if (!ucontext_param) { | |
1253 | ret = -ENOMEM; | |
1254 | goto old_ctx_end; | |
1255 | } | |
1256 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1257 | GFP_KERNEL); | |
1258 | if (!old_ucontext_param) { | |
1259 | ret = -ENOMEM; | |
1260 | goto old_ctx_error_free_param; | |
1261 | } | |
1262 | ||
1263 | if (copy_from_user(old_ucontext_param, | |
1264 | (struct lttng_kernel_old_context __user *) arg, | |
1265 | sizeof(struct lttng_kernel_old_context))) { | |
1266 | ret = -EFAULT; | |
1267 | goto old_ctx_error_free_old_param; | |
1268 | } | |
1269 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1270 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1271 | sizeof(ucontext_param->padding)); | |
1272 | /* only type that uses the union */ | |
1273 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1274 | ucontext_param->u.perf_counter.type = | |
1275 | old_ucontext_param->u.perf_counter.type; | |
1276 | ucontext_param->u.perf_counter.config = | |
1277 | old_ucontext_param->u.perf_counter.config; | |
1278 | memcpy(ucontext_param->u.perf_counter.name, | |
1279 | old_ucontext_param->u.perf_counter.name, | |
1280 | sizeof(ucontext_param->u.perf_counter.name)); | |
1281 | } | |
1282 | ||
1283 | ret = lttng_abi_add_context(file, | |
1284 | ucontext_param, | |
1285 | &event->ctx, event->chan->session); | |
1286 | ||
1287 | old_ctx_error_free_old_param: | |
1288 | kfree(old_ucontext_param); | |
1289 | old_ctx_error_free_param: | |
1290 | kfree(ucontext_param); | |
1291 | old_ctx_end: | |
1292 | return ret; | |
1293 | } | |
8070f5c0 | 1294 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1295 | { |
1296 | struct lttng_kernel_context ucontext_param; | |
1297 | ||
1298 | if (copy_from_user(&ucontext_param, | |
1299 | (struct lttng_kernel_context __user *) arg, | |
1300 | sizeof(ucontext_param))) | |
1301 | return -EFAULT; | |
8070f5c0 | 1302 | return lttng_abi_add_context(file, |
6dccd6c1 | 1303 | &ucontext_param, |
8070f5c0 | 1304 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
1305 | } |
1306 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1307 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1308 | return lttng_event_enable(event); |
6dccd6c1 | 1309 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1310 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1311 | return lttng_event_disable(event); |
8070f5c0 MD |
1312 | default: |
1313 | return -ENOIOCTLCMD; | |
1314 | } | |
1315 | } | |
1316 | ||
0a84a57f MD |
1317 | static |
1318 | int lttng_event_release(struct inode *inode, struct file *file) | |
1319 | { | |
a90917c3 | 1320 | struct lttng_event *event = file->private_data; |
c269fff4 | 1321 | |
aa7c23a9 | 1322 | if (event) |
c269fff4 | 1323 | fput(event->chan->file); |
0a84a57f MD |
1324 | return 0; |
1325 | } | |
1326 | ||
3b923e5b | 1327 | /* TODO: filter control ioctl */ |
0a84a57f | 1328 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1329 | .owner = THIS_MODULE, |
0a84a57f | 1330 | .release = lttng_event_release, |
8070f5c0 MD |
1331 | .unlocked_ioctl = lttng_event_ioctl, |
1332 | #ifdef CONFIG_COMPAT | |
1333 | .compat_ioctl = lttng_event_ioctl, | |
1334 | #endif | |
11b5a3c2 | 1335 | }; |
0a84a57f | 1336 | |
3b731ab1 JD |
1337 | static int put_u64(uint64_t val, unsigned long arg) |
1338 | { | |
1339 | return put_user(val, (uint64_t __user *) arg); | |
1340 | } | |
1341 | ||
ed8d02d6 JD |
1342 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1343 | unsigned int cmd, unsigned long arg) | |
1344 | { | |
3b731ab1 JD |
1345 | struct lib_ring_buffer *buf = filp->private_data; |
1346 | struct channel *chan = buf->backend.chan; | |
1347 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1348 | struct lttng_channel *lttng_chan = channel_get_private(chan); | |
1349 | int ret; | |
1350 | ||
1351 | if (atomic_read(&chan->record_disabled)) | |
1352 | return -EIO; | |
1353 | ||
ed8d02d6 | 1354 | switch (cmd) { |
3b731ab1 JD |
1355 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1356 | { | |
1357 | uint64_t ts; | |
1358 | ||
1359 | if (!lttng_chan->ops) | |
1360 | goto error; | |
1361 | ret = lttng_chan->ops->timestamp_begin(config, buf, &ts); | |
1362 | if (ret < 0) | |
1363 | goto error; | |
1364 | return put_u64(ts, arg); | |
1365 | } | |
1366 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1367 | { | |
1368 | uint64_t ts; | |
1369 | ||
1370 | if (!lttng_chan->ops) | |
1371 | goto error; | |
1372 | ret = lttng_chan->ops->timestamp_end(config, buf, &ts); | |
1373 | if (ret < 0) | |
1374 | goto error; | |
1375 | return put_u64(ts, arg); | |
1376 | } | |
1377 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1378 | { | |
1379 | uint64_t ed; | |
1380 | ||
1381 | if (!lttng_chan->ops) | |
1382 | goto error; | |
1383 | ret = lttng_chan->ops->events_discarded(config, buf, &ed); | |
1384 | if (ret < 0) | |
1385 | goto error; | |
1386 | return put_u64(ed, arg); | |
1387 | } | |
1388 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1389 | { | |
1390 | uint64_t cs; | |
1391 | ||
1392 | if (!lttng_chan->ops) | |
1393 | goto error; | |
1394 | ret = lttng_chan->ops->content_size(config, buf, &cs); | |
1395 | if (ret < 0) | |
1396 | goto error; | |
1397 | return put_u64(cs, arg); | |
1398 | } | |
1399 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1400 | { | |
1401 | uint64_t ps; | |
1402 | ||
1403 | if (!lttng_chan->ops) | |
1404 | goto error; | |
1405 | ret = lttng_chan->ops->packet_size(config, buf, &ps); | |
1406 | if (ret < 0) | |
1407 | goto error; | |
1408 | return put_u64(ps, arg); | |
1409 | } | |
1410 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1411 | { | |
1412 | uint64_t si; | |
1413 | ||
1414 | if (!lttng_chan->ops) | |
1415 | goto error; | |
1416 | ret = lttng_chan->ops->stream_id(config, buf, &si); | |
1417 | if (ret < 0) | |
1418 | goto error; | |
1419 | return put_u64(si, arg); | |
1420 | } | |
2348ca17 JD |
1421 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1422 | { | |
1423 | uint64_t ts; | |
1424 | ||
1425 | if (!lttng_chan->ops) | |
1426 | goto error; | |
1427 | ret = lttng_chan->ops->current_timestamp(config, buf, &ts); | |
1428 | if (ret < 0) | |
1429 | goto error; | |
1430 | return put_u64(ts, arg); | |
1431 | } | |
3b731ab1 JD |
1432 | default: |
1433 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1434 | cmd, arg); | |
ed8d02d6 | 1435 | } |
3b731ab1 JD |
1436 | |
1437 | error: | |
1438 | return -ENOSYS; | |
ed8d02d6 JD |
1439 | } |
1440 | ||
1441 | #ifdef CONFIG_COMPAT | |
1442 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1443 | unsigned int cmd, unsigned long arg) | |
1444 | { | |
3b731ab1 JD |
1445 | struct lib_ring_buffer *buf = filp->private_data; |
1446 | struct channel *chan = buf->backend.chan; | |
1447 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
1448 | struct lttng_channel *lttng_chan = channel_get_private(chan); | |
1449 | int ret; | |
1450 | ||
1451 | if (atomic_read(&chan->record_disabled)) | |
1452 | return -EIO; | |
1453 | ||
ed8d02d6 | 1454 | switch (cmd) { |
3b731ab1 JD |
1455 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1456 | { | |
1457 | uint64_t ts; | |
1458 | ||
1459 | if (!lttng_chan->ops) | |
1460 | goto error; | |
1461 | ret = lttng_chan->ops->timestamp_begin(config, buf, &ts); | |
1462 | if (ret < 0) | |
1463 | goto error; | |
1464 | return put_u64(ts, arg); | |
1465 | } | |
1466 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1467 | { | |
1468 | uint64_t ts; | |
1469 | ||
1470 | if (!lttng_chan->ops) | |
1471 | goto error; | |
1472 | ret = lttng_chan->ops->timestamp_end(config, buf, &ts); | |
1473 | if (ret < 0) | |
1474 | goto error; | |
1475 | return put_u64(ts, arg); | |
1476 | } | |
1477 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1478 | { | |
1479 | uint64_t ed; | |
1480 | ||
1481 | if (!lttng_chan->ops) | |
1482 | goto error; | |
1483 | ret = lttng_chan->ops->events_discarded(config, buf, &ed); | |
1484 | if (ret < 0) | |
1485 | goto error; | |
1486 | return put_u64(ed, arg); | |
ed8d02d6 | 1487 | } |
3b731ab1 JD |
1488 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1489 | { | |
1490 | uint64_t cs; | |
1491 | ||
1492 | if (!lttng_chan->ops) | |
1493 | goto error; | |
1494 | ret = lttng_chan->ops->content_size(config, buf, &cs); | |
1495 | if (ret < 0) | |
1496 | goto error; | |
1497 | return put_u64(cs, arg); | |
1498 | } | |
1499 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1500 | { | |
1501 | uint64_t ps; | |
1502 | ||
1503 | if (!lttng_chan->ops) | |
1504 | goto error; | |
1505 | ret = lttng_chan->ops->packet_size(config, buf, &ps); | |
1506 | if (ret < 0) | |
1507 | goto error; | |
1508 | return put_u64(ps, arg); | |
1509 | } | |
1510 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1511 | { | |
1512 | uint64_t si; | |
1513 | ||
1514 | if (!lttng_chan->ops) | |
1515 | goto error; | |
1516 | ret = lttng_chan->ops->stream_id(config, buf, &si); | |
1517 | if (ret < 0) | |
1518 | goto error; | |
1519 | return put_u64(si, arg); | |
1520 | } | |
2348ca17 JD |
1521 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1522 | { | |
1523 | uint64_t ts; | |
1524 | ||
1525 | if (!lttng_chan->ops) | |
1526 | goto error; | |
1527 | ret = lttng_chan->ops->current_timestamp(config, buf, &ts); | |
1528 | if (ret < 0) | |
1529 | goto error; | |
1530 | return put_u64(ts, arg); | |
1531 | } | |
3b731ab1 JD |
1532 | default: |
1533 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1534 | cmd, arg); | |
1535 | } | |
1536 | ||
1537 | error: | |
1538 | return -ENOSYS; | |
ed8d02d6 JD |
1539 | } |
1540 | #endif /* CONFIG_COMPAT */ | |
1541 | ||
1542 | static void lttng_stream_override_ring_buffer_fops(void) | |
1543 | { | |
1544 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1545 | lttng_stream_ring_buffer_file_operations.open = | |
1546 | lib_ring_buffer_file_operations.open; | |
1547 | lttng_stream_ring_buffer_file_operations.release = | |
1548 | lib_ring_buffer_file_operations.release; | |
1549 | lttng_stream_ring_buffer_file_operations.poll = | |
1550 | lib_ring_buffer_file_operations.poll; | |
1551 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1552 | lib_ring_buffer_file_operations.splice_read; | |
1553 | lttng_stream_ring_buffer_file_operations.mmap = | |
1554 | lib_ring_buffer_file_operations.mmap; | |
1555 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1556 | lttng_stream_ring_buffer_ioctl; | |
1557 | lttng_stream_ring_buffer_file_operations.llseek = | |
1558 | lib_ring_buffer_file_operations.llseek; | |
1559 | #ifdef CONFIG_COMPAT | |
1560 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1561 | lttng_stream_ring_buffer_compat_ioctl; | |
1562 | #endif | |
1563 | } | |
1564 | ||
80996790 | 1565 | int __init lttng_abi_init(void) |
baf20995 MD |
1566 | { |
1567 | int ret = 0; | |
1568 | ||
6d2a620c | 1569 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1570 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1571 | <tng_fops, NULL); |
1572 | ||
255e52a4 | 1573 | if (!lttng_proc_dentry) { |
baf20995 MD |
1574 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1575 | ret = -ENOMEM; | |
1576 | goto error; | |
1577 | } | |
ed8d02d6 JD |
1578 | lttng_stream_override_ring_buffer_fops(); |
1579 | ||
baf20995 MD |
1580 | error: |
1581 | return ret; | |
1582 | } | |
1583 | ||
80996790 | 1584 | void __exit lttng_abi_exit(void) |
baf20995 | 1585 | { |
e6a17f26 MD |
1586 | if (lttng_proc_dentry) |
1587 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1588 | } |