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" |
24cedcfe | 48 | #include "wrapper/poll.h" |
e8951e63 | 49 | #include "lttng-abi.h" |
6dccd6c1 | 50 | #include "lttng-abi-old.h" |
a90917c3 MD |
51 | #include "lttng-events.h" |
52 | #include "lttng-tracer.h" | |
baf20995 MD |
53 | |
54 | /* | |
55 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 56 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
57 | */ |
58 | ||
e6a17f26 | 59 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
60 | static const struct file_operations lttng_fops; |
61 | static const struct file_operations lttng_session_fops; | |
62 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 63 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 64 | static const struct file_operations lttng_event_fops; |
baf20995 | 65 | |
a33c9927 MD |
66 | /* |
67 | * Teardown management: opened file descriptors keep a refcount on the module, | |
68 | * so it can only exit when all file descriptors are closed. | |
69 | */ | |
70 | ||
5dbbdb43 MD |
71 | enum channel_type { |
72 | PER_CPU_CHANNEL, | |
5dbbdb43 MD |
73 | METADATA_CHANNEL, |
74 | }; | |
75 | ||
ad1c05e1 | 76 | static |
baf20995 MD |
77 | int lttng_abi_create_session(void) |
78 | { | |
a90917c3 | 79 | struct lttng_session *session; |
c0e31d2e | 80 | struct file *session_file; |
11b5a3c2 | 81 | int session_fd, ret; |
baf20995 | 82 | |
a90917c3 | 83 | session = lttng_session_create(); |
baf20995 MD |
84 | if (!session) |
85 | return -ENOMEM; | |
1c25284c | 86 | session_fd = get_unused_fd(); |
baf20995 MD |
87 | if (session_fd < 0) { |
88 | ret = session_fd; | |
89 | goto fd_error; | |
90 | } | |
c0e31d2e | 91 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 92 | <tng_session_fops, |
baf20995 | 93 | session, O_RDWR); |
c0e31d2e MD |
94 | if (IS_ERR(session_file)) { |
95 | ret = PTR_ERR(session_file); | |
baf20995 MD |
96 | goto file_error; |
97 | } | |
c0e31d2e MD |
98 | session->file = session_file; |
99 | fd_install(session_fd, session_file); | |
baf20995 MD |
100 | return session_fd; |
101 | ||
102 | file_error: | |
103 | put_unused_fd(session_fd); | |
104 | fd_error: | |
a90917c3 | 105 | lttng_session_destroy(session); |
baf20995 MD |
106 | return ret; |
107 | } | |
108 | ||
271b6681 MD |
109 | static |
110 | int lttng_abi_tracepoint_list(void) | |
111 | { | |
112 | struct file *tracepoint_list_file; | |
113 | int file_fd, ret; | |
114 | ||
115 | file_fd = get_unused_fd(); | |
116 | if (file_fd < 0) { | |
117 | ret = file_fd; | |
118 | goto fd_error; | |
119 | } | |
30f18bf0 | 120 | |
271b6681 MD |
121 | tracepoint_list_file = anon_inode_getfile("[lttng_session]", |
122 | <tng_tracepoint_list_fops, | |
123 | NULL, O_RDWR); | |
124 | if (IS_ERR(tracepoint_list_file)) { | |
125 | ret = PTR_ERR(tracepoint_list_file); | |
126 | goto file_error; | |
127 | } | |
30f18bf0 MD |
128 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
129 | if (ret < 0) | |
130 | goto open_error; | |
271b6681 | 131 | fd_install(file_fd, tracepoint_list_file); |
30f18bf0 MD |
132 | if (file_fd < 0) { |
133 | ret = file_fd; | |
134 | goto fd_error; | |
135 | } | |
271b6681 MD |
136 | return file_fd; |
137 | ||
30f18bf0 MD |
138 | open_error: |
139 | fput(tracepoint_list_file); | |
271b6681 MD |
140 | file_error: |
141 | put_unused_fd(file_fd); | |
142 | fd_error: | |
143 | return ret; | |
144 | } | |
145 | ||
80c16bcf | 146 | static |
6dccd6c1 | 147 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 148 | { |
6dccd6c1 JD |
149 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
150 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
151 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
152 | } |
153 | ||
8070f5c0 MD |
154 | static |
155 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 156 | struct lttng_kernel_context *context_param, |
a90917c3 | 157 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 158 | { |
8070f5c0 MD |
159 | |
160 | if (session->been_active) | |
161 | return -EPERM; | |
162 | ||
6dccd6c1 | 163 | switch (context_param->ctx) { |
12a313a5 | 164 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 165 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
166 | case LTTNG_KERNEL_CONTEXT_PRIO: |
167 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
168 | case LTTNG_KERNEL_CONTEXT_NICE: |
169 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
170 | case LTTNG_KERNEL_CONTEXT_VPID: |
171 | return lttng_add_vpid_to_ctx(ctx); | |
172 | case LTTNG_KERNEL_CONTEXT_TID: | |
173 | return lttng_add_tid_to_ctx(ctx); | |
174 | case LTTNG_KERNEL_CONTEXT_VTID: | |
175 | return lttng_add_vtid_to_ctx(ctx); | |
176 | case LTTNG_KERNEL_CONTEXT_PPID: | |
177 | return lttng_add_ppid_to_ctx(ctx); | |
178 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
179 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 180 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
181 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
182 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
183 | context_param->u.perf_counter.config, | |
184 | context_param->u.perf_counter.name, | |
c24a0d71 | 185 | ctx); |
a2563e83 MD |
186 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
187 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
188 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
189 | return lttng_add_hostname_to_ctx(ctx); | |
8070f5c0 MD |
190 | default: |
191 | return -EINVAL; | |
192 | } | |
193 | } | |
194 | ||
ad1c05e1 MD |
195 | /** |
196 | * lttng_ioctl - lttng syscall through ioctl | |
197 | * | |
c0e31d2e | 198 | * @file: the file |
ad1c05e1 MD |
199 | * @cmd: the command |
200 | * @arg: command arg | |
201 | * | |
202 | * This ioctl implements lttng commands: | |
38d024ae | 203 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 204 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
205 | * LTTNG_KERNEL_TRACER_VERSION |
206 | * Returns the LTTng kernel tracer version | |
207 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
208 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
209 | * LTTNG_KERNEL_WAIT_QUIESCENT |
210 | * Returns after all previously running probes have completed | |
ad1c05e1 MD |
211 | * |
212 | * The returned session will be deleted when its file descriptor is closed. | |
213 | */ | |
214 | static | |
c0e31d2e | 215 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
216 | { |
217 | switch (cmd) { | |
6dccd6c1 | 218 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 219 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 220 | return lttng_abi_create_session(); |
6dccd6c1 JD |
221 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
222 | { | |
223 | struct lttng_kernel_tracer_version v; | |
224 | struct lttng_kernel_old_tracer_version oldv; | |
225 | struct lttng_kernel_old_tracer_version *uversion = | |
226 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
227 | ||
228 | lttng_abi_tracer_version(&v); | |
229 | oldv.major = v.major; | |
230 | oldv.minor = v.minor; | |
231 | oldv.patchlevel = v.patchlevel; | |
232 | ||
233 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
234 | return -EFAULT; | |
235 | return 0; | |
236 | } | |
80c16bcf | 237 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
238 | { |
239 | struct lttng_kernel_tracer_version version; | |
240 | struct lttng_kernel_tracer_version *uversion = | |
241 | (struct lttng_kernel_tracer_version __user *) arg; | |
242 | ||
243 | lttng_abi_tracer_version(&version); | |
244 | ||
245 | if (copy_to_user(uversion, &version, sizeof(version))) | |
246 | return -EFAULT; | |
247 | return 0; | |
248 | } | |
249 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
250 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
251 | return lttng_abi_tracepoint_list(); | |
6dccd6c1 | 252 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
253 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
254 | synchronize_trace(); | |
255 | return 0; | |
6dccd6c1 JD |
256 | case LTTNG_KERNEL_OLD_CALIBRATE: |
257 | { | |
258 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
259 | (struct lttng_kernel_old_calibrate __user *) arg; | |
260 | struct lttng_kernel_old_calibrate old_calibrate; | |
261 | struct lttng_kernel_calibrate calibrate; | |
262 | int ret; | |
263 | ||
264 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
265 | return -EFAULT; | |
266 | calibrate.type = old_calibrate.type; | |
267 | ret = lttng_calibrate(&calibrate); | |
268 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
269 | return -EFAULT; | |
270 | return ret; | |
271 | } | |
57105fc2 MD |
272 | case LTTNG_KERNEL_CALIBRATE: |
273 | { | |
3db41b2c MD |
274 | struct lttng_kernel_calibrate __user *ucalibrate = |
275 | (struct lttng_kernel_calibrate __user *) arg; | |
276 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
277 | int ret; |
278 | ||
279 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
280 | return -EFAULT; | |
281 | ret = lttng_calibrate(&calibrate); | |
282 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
283 | return -EFAULT; | |
284 | return ret; | |
285 | } | |
ad1c05e1 MD |
286 | default: |
287 | return -ENOIOCTLCMD; | |
288 | } | |
289 | } | |
290 | ||
ad1c05e1 | 291 | static const struct file_operations lttng_fops = { |
a33c9927 | 292 | .owner = THIS_MODULE, |
ad1c05e1 MD |
293 | .unlocked_ioctl = lttng_ioctl, |
294 | #ifdef CONFIG_COMPAT | |
03037b98 | 295 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 296 | #endif |
11b5a3c2 | 297 | }; |
ad1c05e1 | 298 | |
5dbbdb43 | 299 | static |
c0e31d2e | 300 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 301 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 302 | enum channel_type channel_type) |
baf20995 | 303 | { |
a90917c3 | 304 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 305 | const struct file_operations *fops = NULL; |
5dbbdb43 | 306 | const char *transport_name; |
a90917c3 | 307 | struct lttng_channel *chan; |
c0e31d2e | 308 | struct file *chan_file; |
baf20995 | 309 | int chan_fd; |
ad1c05e1 | 310 | int ret = 0; |
baf20995 | 311 | |
1c25284c | 312 | chan_fd = get_unused_fd(); |
baf20995 MD |
313 | if (chan_fd < 0) { |
314 | ret = chan_fd; | |
315 | goto fd_error; | |
316 | } | |
88dfd899 MD |
317 | switch (channel_type) { |
318 | case PER_CPU_CHANNEL: | |
319 | fops = <tng_channel_fops; | |
320 | break; | |
321 | case METADATA_CHANNEL: | |
322 | fops = <tng_metadata_fops; | |
323 | break; | |
324 | } | |
325 | ||
c0e31d2e | 326 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 327 | fops, |
03037b98 | 328 | NULL, O_RDWR); |
c0e31d2e MD |
329 | if (IS_ERR(chan_file)) { |
330 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
331 | goto file_error; |
332 | } | |
5dbbdb43 MD |
333 | switch (channel_type) { |
334 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
335 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
336 | transport_name = chan_param->overwrite ? | |
96ba7208 | 337 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
338 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
339 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
340 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
341 | } else { | |
342 | return -EINVAL; | |
343 | } | |
5dbbdb43 | 344 | break; |
5dbbdb43 | 345 | case METADATA_CHANNEL: |
6dccd6c1 | 346 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 347 | transport_name = "relay-metadata"; |
6dccd6c1 | 348 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
349 | transport_name = "relay-metadata-mmap"; |
350 | else | |
351 | return -EINVAL; | |
5dbbdb43 MD |
352 | break; |
353 | default: | |
354 | transport_name = "<unknown>"; | |
355 | break; | |
356 | } | |
03037b98 MD |
357 | /* |
358 | * We tolerate no failure path after channel creation. It will stay | |
359 | * invariant for the rest of the session. | |
360 | */ | |
a90917c3 | 361 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
362 | chan_param->subbuf_size, |
363 | chan_param->num_subbuf, | |
364 | chan_param->switch_timer_interval, | |
365 | chan_param->read_timer_interval); | |
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); | |
cd4bd11f | 373 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f MD |
374 | session->metadata = chan; |
375 | } | |
5dbbdb43 | 376 | |
ad1c05e1 | 377 | /* The channel created holds a reference on the session */ |
b0caa15a | 378 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 379 | |
baf20995 MD |
380 | return chan_fd; |
381 | ||
03037b98 | 382 | chan_error: |
c0e31d2e | 383 | fput(chan_file); |
baf20995 MD |
384 | file_error: |
385 | put_unused_fd(chan_fd); | |
386 | fd_error: | |
baf20995 MD |
387 | return ret; |
388 | } | |
389 | ||
390 | /** | |
ad1c05e1 | 391 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 392 | * |
c0e31d2e | 393 | * @file: the file |
baf20995 MD |
394 | * @cmd: the command |
395 | * @arg: command arg | |
396 | * | |
397 | * This ioctl implements lttng commands: | |
38d024ae | 398 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 399 | * Returns a LTTng channel file descriptor |
e64957da MD |
400 | * LTTNG_KERNEL_ENABLE |
401 | * Enables tracing for a session (weak enable) | |
402 | * LTTNG_KERNEL_DISABLE | |
403 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
404 | * LTTNG_KERNEL_METADATA |
405 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
406 | * |
407 | * The returned channel will be deleted when its file descriptor is closed. | |
408 | */ | |
409 | static | |
c0e31d2e | 410 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 411 | { |
a90917c3 | 412 | struct lttng_session *session = file->private_data; |
c0e31d2e | 413 | |
ad1c05e1 | 414 | switch (cmd) { |
6dccd6c1 JD |
415 | case LTTNG_KERNEL_OLD_CHANNEL: |
416 | { | |
417 | struct lttng_kernel_channel chan_param; | |
418 | struct lttng_kernel_old_channel old_chan_param; | |
419 | ||
420 | if (copy_from_user(&old_chan_param, | |
421 | (struct lttng_kernel_old_channel __user *) arg, | |
422 | sizeof(struct lttng_kernel_old_channel))) | |
423 | return -EFAULT; | |
424 | chan_param.overwrite = old_chan_param.overwrite; | |
425 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
426 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
427 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
428 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
429 | chan_param.output = old_chan_param.output; | |
430 | ||
431 | return lttng_abi_create_channel(file, &chan_param, | |
432 | PER_CPU_CHANNEL); | |
433 | } | |
38d024ae | 434 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
435 | { |
436 | struct lttng_kernel_channel chan_param; | |
437 | ||
438 | if (copy_from_user(&chan_param, | |
38d024ae | 439 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
440 | sizeof(struct lttng_kernel_channel))) |
441 | return -EFAULT; | |
442 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 443 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
444 | } |
445 | case LTTNG_KERNEL_OLD_SESSION_START: | |
446 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 447 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 448 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 449 | return lttng_session_enable(session); |
6dccd6c1 JD |
450 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
451 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 452 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 453 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 454 | return lttng_session_disable(session); |
6dccd6c1 JD |
455 | case LTTNG_KERNEL_OLD_METADATA: |
456 | { | |
457 | struct lttng_kernel_channel chan_param; | |
458 | struct lttng_kernel_old_channel old_chan_param; | |
459 | ||
460 | if (copy_from_user(&old_chan_param, | |
461 | (struct lttng_kernel_old_channel __user *) arg, | |
462 | sizeof(struct lttng_kernel_old_channel))) | |
463 | return -EFAULT; | |
464 | chan_param.overwrite = old_chan_param.overwrite; | |
465 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
466 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
467 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
468 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
469 | chan_param.output = old_chan_param.output; | |
470 | ||
471 | return lttng_abi_create_channel(file, &chan_param, | |
472 | METADATA_CHANNEL); | |
473 | } | |
38d024ae | 474 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
475 | { |
476 | struct lttng_kernel_channel chan_param; | |
477 | ||
478 | if (copy_from_user(&chan_param, | |
479 | (struct lttng_kernel_channel __user *) arg, | |
480 | sizeof(struct lttng_kernel_channel))) | |
481 | return -EFAULT; | |
482 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 483 | METADATA_CHANNEL); |
6dccd6c1 | 484 | } |
ad1c05e1 MD |
485 | default: |
486 | return -ENOIOCTLCMD; | |
487 | } | |
488 | } | |
489 | ||
03037b98 MD |
490 | /* |
491 | * Called when the last file reference is dropped. | |
492 | * | |
493 | * Big fat note: channels and events are invariant for the whole session after | |
494 | * their creation. So this session destruction also destroys all channel and | |
495 | * event structures specific to this session (they are not destroyed when their | |
496 | * individual file is released). | |
497 | */ | |
ad1c05e1 | 498 | static |
03037b98 | 499 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 500 | { |
a90917c3 | 501 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
502 | |
503 | if (session) | |
a90917c3 | 504 | lttng_session_destroy(session); |
11b5a3c2 | 505 | return 0; |
ad1c05e1 | 506 | } |
ad1c05e1 MD |
507 | |
508 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 509 | .owner = THIS_MODULE, |
03037b98 | 510 | .release = lttng_session_release, |
ad1c05e1 MD |
511 | .unlocked_ioctl = lttng_session_ioctl, |
512 | #ifdef CONFIG_COMPAT | |
03037b98 | 513 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 514 | #endif |
11b5a3c2 | 515 | }; |
ad1c05e1 MD |
516 | |
517 | static | |
c0e31d2e | 518 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 519 | { |
a90917c3 | 520 | struct lttng_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
521 | struct lib_ring_buffer *buf; |
522 | int stream_fd, ret; | |
11b5a3c2 | 523 | struct file *stream_file; |
ad1c05e1 | 524 | |
11b5a3c2 | 525 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
526 | if (!buf) |
527 | return -ENOENT; | |
528 | ||
1c25284c | 529 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
530 | if (stream_fd < 0) { |
531 | ret = stream_fd; | |
532 | goto fd_error; | |
533 | } | |
c0e31d2e | 534 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 535 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 536 | buf, O_RDWR); |
c0e31d2e MD |
537 | if (IS_ERR(stream_file)) { |
538 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
539 | goto file_error; |
540 | } | |
409453cb MD |
541 | /* |
542 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
543 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
544 | * file descriptor, so we set FMODE_PREAD here. | |
545 | */ | |
d7b6f197 | 546 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 547 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
548 | /* |
549 | * The stream holds a reference to the channel within the generic ring | |
550 | * buffer library, so no need to hold a refcount on the channel and | |
551 | * session files here. | |
552 | */ | |
ad1c05e1 MD |
553 | return stream_fd; |
554 | ||
555 | file_error: | |
556 | put_unused_fd(stream_fd); | |
557 | fd_error: | |
11b5a3c2 | 558 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
559 | return ret; |
560 | } | |
561 | ||
653fe716 | 562 | static |
c0e31d2e | 563 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 564 | struct lttng_kernel_event *event_param) |
653fe716 | 565 | { |
a90917c3 MD |
566 | struct lttng_channel *channel = channel_file->private_data; |
567 | struct lttng_event *event; | |
653fe716 | 568 | int event_fd, ret; |
11b5a3c2 | 569 | struct file *event_file; |
653fe716 | 570 | |
6dccd6c1 JD |
571 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
572 | switch (event_param->instrumentation) { | |
7371f44c | 573 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 574 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 575 | break; |
ab2277d6 | 576 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 577 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 578 | break; |
ab2277d6 | 579 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 580 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
581 | break; |
582 | default: | |
583 | break; | |
584 | } | |
6dccd6c1 | 585 | switch (event_param->instrumentation) { |
1ec65de1 MD |
586 | default: |
587 | event_fd = get_unused_fd(); | |
588 | if (event_fd < 0) { | |
589 | ret = event_fd; | |
590 | goto fd_error; | |
591 | } | |
592 | event_file = anon_inode_getfile("[lttng_event]", | |
593 | <tng_event_fops, | |
594 | NULL, O_RDWR); | |
595 | if (IS_ERR(event_file)) { | |
596 | ret = PTR_ERR(event_file); | |
597 | goto file_error; | |
598 | } | |
599 | /* | |
600 | * We tolerate no failure path after event creation. It | |
601 | * will stay invariant for the rest of the session. | |
602 | */ | |
6dccd6c1 | 603 | event = lttng_event_create(channel, event_param, NULL, NULL); |
1ec65de1 MD |
604 | if (!event) { |
605 | ret = -EINVAL; | |
606 | goto event_error; | |
607 | } | |
608 | event_file->private_data = event; | |
609 | fd_install(event_fd, event_file); | |
610 | /* The event holds a reference on the channel */ | |
611 | atomic_long_inc(&channel_file->f_count); | |
612 | break; | |
43880ee8 MD |
613 | case LTTNG_KERNEL_SYSCALL: |
614 | /* | |
615 | * Only all-syscall tracing supported for now. | |
616 | */ | |
6dccd6c1 | 617 | if (event_param->name[0] != '\0') |
43880ee8 | 618 | return -EINVAL; |
1ec65de1 MD |
619 | ret = lttng_syscalls_register(channel, NULL); |
620 | if (ret) | |
621 | goto fd_error; | |
622 | event_fd = 0; | |
623 | break; | |
03037b98 | 624 | } |
653fe716 MD |
625 | return event_fd; |
626 | ||
03037b98 | 627 | event_error: |
c0e31d2e | 628 | fput(event_file); |
653fe716 MD |
629 | file_error: |
630 | put_unused_fd(event_fd); | |
631 | fd_error: | |
653fe716 MD |
632 | return ret; |
633 | } | |
ad1c05e1 MD |
634 | |
635 | /** | |
636 | * lttng_channel_ioctl - lttng syscall through ioctl | |
637 | * | |
c0e31d2e | 638 | * @file: the file |
ad1c05e1 MD |
639 | * @cmd: the command |
640 | * @arg: command arg | |
641 | * | |
642 | * This ioctl implements lttng commands: | |
38d024ae | 643 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
644 | * Returns an event stream file descriptor or failure. |
645 | * (typically, one event stream records events from one CPU) | |
38d024ae | 646 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 647 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
648 | * LTTNG_KERNEL_CONTEXT |
649 | * Prepend a context field to each event in the channel | |
e64957da MD |
650 | * LTTNG_KERNEL_ENABLE |
651 | * Enable recording for events in this channel (weak enable) | |
652 | * LTTNG_KERNEL_DISABLE | |
653 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 654 | * |
baf20995 MD |
655 | * Channel and event file descriptors also hold a reference on the session. |
656 | */ | |
ad1c05e1 | 657 | static |
c0e31d2e | 658 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 659 | { |
a90917c3 | 660 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 661 | |
baf20995 | 662 | switch (cmd) { |
6dccd6c1 | 663 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 664 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 665 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
666 | case LTTNG_KERNEL_OLD_EVENT: |
667 | { | |
668 | struct lttng_kernel_event *uevent_param; | |
669 | struct lttng_kernel_old_event *old_uevent_param; | |
670 | int ret; | |
671 | ||
672 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
673 | GFP_KERNEL); | |
674 | if (!uevent_param) { | |
675 | ret = -ENOMEM; | |
676 | goto old_event_end; | |
677 | } | |
678 | old_uevent_param = kmalloc( | |
679 | sizeof(struct lttng_kernel_old_event), | |
680 | GFP_KERNEL); | |
681 | if (!old_uevent_param) { | |
682 | ret = -ENOMEM; | |
683 | goto old_event_error_free_param; | |
684 | } | |
685 | if (copy_from_user(old_uevent_param, | |
686 | (struct lttng_kernel_old_event __user *) arg, | |
687 | sizeof(struct lttng_kernel_old_event))) { | |
688 | ret = -EFAULT; | |
689 | goto old_event_error_free_old_param; | |
690 | } | |
691 | ||
692 | memcpy(uevent_param->name, old_uevent_param->name, | |
693 | sizeof(uevent_param->name)); | |
694 | uevent_param->instrumentation = | |
695 | old_uevent_param->instrumentation; | |
696 | ||
697 | switch (old_uevent_param->instrumentation) { | |
698 | case LTTNG_KERNEL_KPROBE: | |
699 | uevent_param->u.kprobe.addr = | |
700 | old_uevent_param->u.kprobe.addr; | |
701 | uevent_param->u.kprobe.offset = | |
702 | old_uevent_param->u.kprobe.offset; | |
703 | memcpy(uevent_param->u.kprobe.symbol_name, | |
704 | old_uevent_param->u.kprobe.symbol_name, | |
705 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
706 | break; | |
707 | case LTTNG_KERNEL_KRETPROBE: | |
708 | uevent_param->u.kretprobe.addr = | |
709 | old_uevent_param->u.kretprobe.addr; | |
710 | uevent_param->u.kretprobe.offset = | |
711 | old_uevent_param->u.kretprobe.offset; | |
712 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
713 | old_uevent_param->u.kretprobe.symbol_name, | |
714 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
715 | break; | |
716 | case LTTNG_KERNEL_FUNCTION: | |
717 | memcpy(uevent_param->u.ftrace.symbol_name, | |
718 | old_uevent_param->u.ftrace.symbol_name, | |
719 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
720 | break; | |
721 | default: | |
722 | break; | |
723 | } | |
724 | ret = lttng_abi_create_event(file, uevent_param); | |
725 | ||
726 | old_event_error_free_old_param: | |
727 | kfree(old_uevent_param); | |
728 | old_event_error_free_param: | |
729 | kfree(uevent_param); | |
730 | old_event_end: | |
731 | return ret; | |
732 | } | |
38d024ae | 733 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
734 | { |
735 | struct lttng_kernel_event uevent_param; | |
736 | ||
737 | if (copy_from_user(&uevent_param, | |
738 | (struct lttng_kernel_event __user *) arg, | |
739 | sizeof(uevent_param))) | |
740 | return -EFAULT; | |
741 | return lttng_abi_create_event(file, &uevent_param); | |
742 | } | |
743 | case LTTNG_KERNEL_OLD_CONTEXT: | |
744 | { | |
745 | struct lttng_kernel_context *ucontext_param; | |
746 | struct lttng_kernel_old_context *old_ucontext_param; | |
747 | int ret; | |
748 | ||
749 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
750 | GFP_KERNEL); | |
751 | if (!ucontext_param) { | |
752 | ret = -ENOMEM; | |
753 | goto old_ctx_end; | |
754 | } | |
755 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
756 | GFP_KERNEL); | |
757 | if (!old_ucontext_param) { | |
758 | ret = -ENOMEM; | |
759 | goto old_ctx_error_free_param; | |
760 | } | |
761 | ||
762 | if (copy_from_user(old_ucontext_param, | |
763 | (struct lttng_kernel_old_context __user *) arg, | |
764 | sizeof(struct lttng_kernel_old_context))) { | |
765 | ret = -EFAULT; | |
766 | goto old_ctx_error_free_old_param; | |
767 | } | |
768 | ucontext_param->ctx = old_ucontext_param->ctx; | |
769 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
770 | sizeof(ucontext_param->padding)); | |
771 | /* only type that uses the union */ | |
772 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
773 | ucontext_param->u.perf_counter.type = | |
774 | old_ucontext_param->u.perf_counter.type; | |
775 | ucontext_param->u.perf_counter.config = | |
776 | old_ucontext_param->u.perf_counter.config; | |
777 | memcpy(ucontext_param->u.perf_counter.name, | |
778 | old_ucontext_param->u.perf_counter.name, | |
779 | sizeof(ucontext_param->u.perf_counter.name)); | |
780 | } | |
781 | ||
782 | ret = lttng_abi_add_context(file, | |
783 | ucontext_param, | |
784 | &channel->ctx, channel->session); | |
785 | ||
786 | old_ctx_error_free_old_param: | |
787 | kfree(old_ucontext_param); | |
788 | old_ctx_error_free_param: | |
789 | kfree(ucontext_param); | |
790 | old_ctx_end: | |
791 | return ret; | |
792 | } | |
8070f5c0 | 793 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
794 | { |
795 | struct lttng_kernel_context ucontext_param; | |
796 | ||
797 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 798 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
799 | sizeof(ucontext_param))) |
800 | return -EFAULT; | |
801 | return lttng_abi_add_context(file, | |
802 | &ucontext_param, | |
8070f5c0 | 803 | &channel->ctx, channel->session); |
6dccd6c1 JD |
804 | } |
805 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 806 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 807 | return lttng_channel_enable(channel); |
6dccd6c1 | 808 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 809 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 810 | return lttng_channel_disable(channel); |
baf20995 MD |
811 | default: |
812 | return -ENOIOCTLCMD; | |
813 | } | |
6dccd6c1 | 814 | |
baf20995 MD |
815 | } |
816 | ||
5dbbdb43 MD |
817 | /** |
818 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
819 | * | |
820 | * @file: the file | |
821 | * @cmd: the command | |
822 | * @arg: command arg | |
823 | * | |
824 | * This ioctl implements lttng commands: | |
38d024ae | 825 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
826 | * Returns an event stream file descriptor or failure. |
827 | * | |
828 | * Channel and event file descriptors also hold a reference on the session. | |
829 | */ | |
830 | static | |
831 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
832 | { | |
833 | switch (cmd) { | |
6dccd6c1 | 834 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 835 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
836 | return lttng_abi_open_stream(file); |
837 | default: | |
838 | return -ENOIOCTLCMD; | |
839 | } | |
840 | } | |
841 | ||
653fe716 MD |
842 | /** |
843 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
844 | * | |
c0e31d2e | 845 | * @file: the file |
653fe716 MD |
846 | * @wait: poll table |
847 | */ | |
c0e31d2e | 848 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 849 | { |
a90917c3 | 850 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
851 | unsigned int mask = 0; |
852 | ||
c0e31d2e | 853 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 854 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
855 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
856 | wait); | |
653fe716 | 857 | |
254ec7bc MD |
858 | if (channel->ops->is_disabled(channel->chan)) |
859 | return POLLERR; | |
24cedcfe | 860 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 861 | return POLLHUP; |
f71ecafa | 862 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 863 | return POLLIN | POLLRDNORM; |
f71ecafa | 864 | return 0; |
653fe716 MD |
865 | } |
866 | return mask; | |
867 | ||
868 | } | |
869 | ||
0a84a57f MD |
870 | static |
871 | int lttng_channel_release(struct inode *inode, struct file *file) | |
872 | { | |
a90917c3 | 873 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
874 | |
875 | if (channel) | |
876 | fput(channel->session->file); | |
0a84a57f MD |
877 | return 0; |
878 | } | |
879 | ||
ad1c05e1 | 880 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 881 | .owner = THIS_MODULE, |
03037b98 | 882 | .release = lttng_channel_release, |
653fe716 | 883 | .poll = lttng_channel_poll, |
ad1c05e1 | 884 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 885 | #ifdef CONFIG_COMPAT |
03037b98 | 886 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 887 | #endif |
11b5a3c2 | 888 | }; |
baf20995 | 889 | |
5dbbdb43 | 890 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 891 | .owner = THIS_MODULE, |
5dbbdb43 MD |
892 | .release = lttng_channel_release, |
893 | .unlocked_ioctl = lttng_metadata_ioctl, | |
894 | #ifdef CONFIG_COMPAT | |
895 | .compat_ioctl = lttng_metadata_ioctl, | |
896 | #endif | |
897 | }; | |
898 | ||
8070f5c0 MD |
899 | /** |
900 | * lttng_event_ioctl - lttng syscall through ioctl | |
901 | * | |
902 | * @file: the file | |
903 | * @cmd: the command | |
904 | * @arg: command arg | |
905 | * | |
906 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
907 | * LTTNG_KERNEL_CONTEXT |
908 | * Prepend a context field to each record of this event | |
e64957da MD |
909 | * LTTNG_KERNEL_ENABLE |
910 | * Enable recording for this event (weak enable) | |
911 | * LTTNG_KERNEL_DISABLE | |
912 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
913 | */ |
914 | static | |
915 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
916 | { | |
a90917c3 | 917 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
918 | |
919 | switch (cmd) { | |
6dccd6c1 JD |
920 | case LTTNG_KERNEL_OLD_CONTEXT: |
921 | { | |
922 | struct lttng_kernel_context *ucontext_param; | |
923 | struct lttng_kernel_old_context *old_ucontext_param; | |
924 | int ret; | |
925 | ||
926 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
927 | GFP_KERNEL); | |
928 | if (!ucontext_param) { | |
929 | ret = -ENOMEM; | |
930 | goto old_ctx_end; | |
931 | } | |
932 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
933 | GFP_KERNEL); | |
934 | if (!old_ucontext_param) { | |
935 | ret = -ENOMEM; | |
936 | goto old_ctx_error_free_param; | |
937 | } | |
938 | ||
939 | if (copy_from_user(old_ucontext_param, | |
940 | (struct lttng_kernel_old_context __user *) arg, | |
941 | sizeof(struct lttng_kernel_old_context))) { | |
942 | ret = -EFAULT; | |
943 | goto old_ctx_error_free_old_param; | |
944 | } | |
945 | ucontext_param->ctx = old_ucontext_param->ctx; | |
946 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
947 | sizeof(ucontext_param->padding)); | |
948 | /* only type that uses the union */ | |
949 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
950 | ucontext_param->u.perf_counter.type = | |
951 | old_ucontext_param->u.perf_counter.type; | |
952 | ucontext_param->u.perf_counter.config = | |
953 | old_ucontext_param->u.perf_counter.config; | |
954 | memcpy(ucontext_param->u.perf_counter.name, | |
955 | old_ucontext_param->u.perf_counter.name, | |
956 | sizeof(ucontext_param->u.perf_counter.name)); | |
957 | } | |
958 | ||
959 | ret = lttng_abi_add_context(file, | |
960 | ucontext_param, | |
961 | &event->ctx, event->chan->session); | |
962 | ||
963 | old_ctx_error_free_old_param: | |
964 | kfree(old_ucontext_param); | |
965 | old_ctx_error_free_param: | |
966 | kfree(ucontext_param); | |
967 | old_ctx_end: | |
968 | return ret; | |
969 | } | |
8070f5c0 | 970 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
971 | { |
972 | struct lttng_kernel_context ucontext_param; | |
973 | ||
974 | if (copy_from_user(&ucontext_param, | |
975 | (struct lttng_kernel_context __user *) arg, | |
976 | sizeof(ucontext_param))) | |
977 | return -EFAULT; | |
8070f5c0 | 978 | return lttng_abi_add_context(file, |
6dccd6c1 | 979 | &ucontext_param, |
8070f5c0 | 980 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
981 | } |
982 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 983 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 984 | return lttng_event_enable(event); |
6dccd6c1 | 985 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 986 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 987 | return lttng_event_disable(event); |
8070f5c0 MD |
988 | default: |
989 | return -ENOIOCTLCMD; | |
990 | } | |
991 | } | |
992 | ||
0a84a57f MD |
993 | static |
994 | int lttng_event_release(struct inode *inode, struct file *file) | |
995 | { | |
a90917c3 | 996 | struct lttng_event *event = file->private_data; |
c269fff4 | 997 | |
aa7c23a9 | 998 | if (event) |
c269fff4 | 999 | fput(event->chan->file); |
0a84a57f MD |
1000 | return 0; |
1001 | } | |
1002 | ||
3b923e5b | 1003 | /* TODO: filter control ioctl */ |
0a84a57f | 1004 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1005 | .owner = THIS_MODULE, |
0a84a57f | 1006 | .release = lttng_event_release, |
8070f5c0 MD |
1007 | .unlocked_ioctl = lttng_event_ioctl, |
1008 | #ifdef CONFIG_COMPAT | |
1009 | .compat_ioctl = lttng_event_ioctl, | |
1010 | #endif | |
11b5a3c2 | 1011 | }; |
0a84a57f | 1012 | |
80996790 | 1013 | int __init lttng_abi_init(void) |
baf20995 MD |
1014 | { |
1015 | int ret = 0; | |
1016 | ||
6d2a620c | 1017 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1018 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1019 | <tng_fops, NULL); |
1020 | ||
255e52a4 | 1021 | if (!lttng_proc_dentry) { |
baf20995 MD |
1022 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1023 | ret = -ENOMEM; | |
1024 | goto error; | |
1025 | } | |
1026 | error: | |
1027 | return ret; | |
1028 | } | |
1029 | ||
80996790 | 1030 | void __exit lttng_abi_exit(void) |
baf20995 | 1031 | { |
e6a17f26 MD |
1032 | if (lttng_proc_dentry) |
1033 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1034 | } |