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> | |
abc0446a | 46 | #include <linux/err.h> |
b13f3ebe | 47 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 48 | #include "wrapper/ringbuffer/vfs.h" |
d83004aa JD |
49 | #include "wrapper/ringbuffer/backend.h" |
50 | #include "wrapper/ringbuffer/frontend.h" | |
24cedcfe | 51 | #include "wrapper/poll.h" |
e8951e63 | 52 | #include "lttng-abi.h" |
6dccd6c1 | 53 | #include "lttng-abi-old.h" |
a90917c3 MD |
54 | #include "lttng-events.h" |
55 | #include "lttng-tracer.h" | |
3b731ab1 | 56 | #include "lib/ringbuffer/frontend_types.h" |
baf20995 MD |
57 | |
58 | /* | |
59 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 60 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
61 | */ |
62 | ||
e6a17f26 | 63 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
64 | static const struct file_operations lttng_fops; |
65 | static const struct file_operations lttng_session_fops; | |
66 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 67 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 68 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 69 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 70 | |
a33c9927 MD |
71 | /* |
72 | * Teardown management: opened file descriptors keep a refcount on the module, | |
73 | * so it can only exit when all file descriptors are closed. | |
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, | |
d83004aa JD |
365 | chan_param->read_timer_interval, |
366 | channel_type); | |
03037b98 | 367 | if (!chan) { |
f3d01b96 | 368 | ret = -EINVAL; |
03037b98 MD |
369 | goto chan_error; |
370 | } | |
11b5a3c2 | 371 | chan->file = chan_file; |
c0e31d2e MD |
372 | chan_file->private_data = chan; |
373 | fd_install(chan_fd, chan_file); | |
b0caa15a | 374 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 375 | |
baf20995 MD |
376 | return chan_fd; |
377 | ||
03037b98 | 378 | chan_error: |
c0e31d2e | 379 | fput(chan_file); |
baf20995 MD |
380 | file_error: |
381 | put_unused_fd(chan_fd); | |
382 | fd_error: | |
baf20995 MD |
383 | return ret; |
384 | } | |
385 | ||
386 | /** | |
ad1c05e1 | 387 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 388 | * |
c0e31d2e | 389 | * @file: the file |
baf20995 MD |
390 | * @cmd: the command |
391 | * @arg: command arg | |
392 | * | |
393 | * This ioctl implements lttng commands: | |
38d024ae | 394 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 395 | * Returns a LTTng channel file descriptor |
e64957da MD |
396 | * LTTNG_KERNEL_ENABLE |
397 | * Enables tracing for a session (weak enable) | |
398 | * LTTNG_KERNEL_DISABLE | |
399 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
400 | * LTTNG_KERNEL_METADATA |
401 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
402 | * |
403 | * The returned channel will be deleted when its file descriptor is closed. | |
404 | */ | |
405 | static | |
c0e31d2e | 406 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 407 | { |
a90917c3 | 408 | struct lttng_session *session = file->private_data; |
c0e31d2e | 409 | |
ad1c05e1 | 410 | switch (cmd) { |
6dccd6c1 JD |
411 | case LTTNG_KERNEL_OLD_CHANNEL: |
412 | { | |
413 | struct lttng_kernel_channel chan_param; | |
414 | struct lttng_kernel_old_channel old_chan_param; | |
415 | ||
416 | if (copy_from_user(&old_chan_param, | |
417 | (struct lttng_kernel_old_channel __user *) arg, | |
418 | sizeof(struct lttng_kernel_old_channel))) | |
419 | return -EFAULT; | |
420 | chan_param.overwrite = old_chan_param.overwrite; | |
421 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
422 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
423 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
424 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
425 | chan_param.output = old_chan_param.output; | |
426 | ||
427 | return lttng_abi_create_channel(file, &chan_param, | |
428 | PER_CPU_CHANNEL); | |
429 | } | |
38d024ae | 430 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
431 | { |
432 | struct lttng_kernel_channel chan_param; | |
433 | ||
434 | if (copy_from_user(&chan_param, | |
38d024ae | 435 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
436 | sizeof(struct lttng_kernel_channel))) |
437 | return -EFAULT; | |
438 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 439 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
440 | } |
441 | case LTTNG_KERNEL_OLD_SESSION_START: | |
442 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 443 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 444 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 445 | return lttng_session_enable(session); |
6dccd6c1 JD |
446 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
447 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 448 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 449 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 450 | return lttng_session_disable(session); |
6dccd6c1 JD |
451 | case LTTNG_KERNEL_OLD_METADATA: |
452 | { | |
453 | struct lttng_kernel_channel chan_param; | |
454 | struct lttng_kernel_old_channel old_chan_param; | |
455 | ||
456 | if (copy_from_user(&old_chan_param, | |
457 | (struct lttng_kernel_old_channel __user *) arg, | |
458 | sizeof(struct lttng_kernel_old_channel))) | |
459 | return -EFAULT; | |
460 | chan_param.overwrite = old_chan_param.overwrite; | |
461 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
462 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
463 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
464 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
465 | chan_param.output = old_chan_param.output; | |
466 | ||
467 | return lttng_abi_create_channel(file, &chan_param, | |
468 | METADATA_CHANNEL); | |
469 | } | |
38d024ae | 470 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
471 | { |
472 | struct lttng_kernel_channel chan_param; | |
473 | ||
474 | if (copy_from_user(&chan_param, | |
475 | (struct lttng_kernel_channel __user *) arg, | |
476 | sizeof(struct lttng_kernel_channel))) | |
477 | return -EFAULT; | |
478 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 479 | METADATA_CHANNEL); |
6dccd6c1 | 480 | } |
ad1c05e1 MD |
481 | default: |
482 | return -ENOIOCTLCMD; | |
483 | } | |
484 | } | |
485 | ||
03037b98 MD |
486 | /* |
487 | * Called when the last file reference is dropped. | |
488 | * | |
489 | * Big fat note: channels and events are invariant for the whole session after | |
490 | * their creation. So this session destruction also destroys all channel and | |
491 | * event structures specific to this session (they are not destroyed when their | |
492 | * individual file is released). | |
493 | */ | |
ad1c05e1 | 494 | static |
03037b98 | 495 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 496 | { |
a90917c3 | 497 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
498 | |
499 | if (session) | |
a90917c3 | 500 | lttng_session_destroy(session); |
11b5a3c2 | 501 | return 0; |
ad1c05e1 | 502 | } |
ad1c05e1 MD |
503 | |
504 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 505 | .owner = THIS_MODULE, |
03037b98 | 506 | .release = lttng_session_release, |
ad1c05e1 MD |
507 | .unlocked_ioctl = lttng_session_ioctl, |
508 | #ifdef CONFIG_COMPAT | |
03037b98 | 509 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 510 | #endif |
11b5a3c2 | 511 | }; |
ad1c05e1 | 512 | |
d83004aa JD |
513 | /** |
514 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
515 | * @filp: the file | |
516 | * @wait: poll table | |
517 | * | |
518 | * Handles the poll operations for the metadata channels. | |
519 | */ | |
ad1c05e1 | 520 | static |
d83004aa JD |
521 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
522 | poll_table *wait) | |
523 | { | |
524 | struct lttng_metadata_stream *stream = filp->private_data; | |
525 | struct lib_ring_buffer *buf = stream->priv; | |
526 | int finalized; | |
527 | unsigned int mask = 0; | |
528 | ||
529 | if (filp->f_mode & FMODE_READ) { | |
530 | poll_wait_set_exclusive(wait); | |
531 | poll_wait(filp, &stream->read_wait, wait); | |
532 | ||
533 | finalized = stream->finalized; | |
534 | ||
535 | /* | |
536 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
537 | * ordering finalized load before offsets loads. | |
538 | */ | |
539 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
540 | ||
541 | if (finalized) | |
542 | mask |= POLLHUP; | |
543 | ||
544 | if (stream->metadata_cache->metadata_written > | |
f613e3e6 | 545 | stream->metadata_out) |
d83004aa JD |
546 | mask |= POLLIN; |
547 | } | |
548 | ||
549 | return mask; | |
550 | } | |
551 | ||
f613e3e6 MD |
552 | static |
553 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
554 | unsigned int cmd, unsigned long arg) | |
555 | { | |
556 | struct lttng_metadata_stream *stream = filp->private_data; | |
557 | ||
558 | stream->metadata_out = stream->metadata_in; | |
559 | } | |
560 | ||
d83004aa JD |
561 | static |
562 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
563 | unsigned int cmd, unsigned long arg) | |
564 | { | |
565 | int ret; | |
566 | struct lttng_metadata_stream *stream = filp->private_data; | |
567 | struct lib_ring_buffer *buf = stream->priv; | |
568 | ||
569 | switch (cmd) { | |
d83004aa JD |
570 | case RING_BUFFER_GET_NEXT_SUBBUF: |
571 | { | |
35097f36 JD |
572 | struct lttng_metadata_stream *stream = filp->private_data; |
573 | struct lib_ring_buffer *buf = stream->priv; | |
574 | struct channel *chan = buf->backend.chan; | |
575 | ||
576 | ret = lttng_metadata_output_channel(stream, chan); | |
577 | if (ret > 0) { | |
578 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
579 | ret = 0; | |
580 | } else if (ret < 0) | |
d83004aa JD |
581 | goto err; |
582 | break; | |
583 | } | |
f613e3e6 MD |
584 | case RING_BUFFER_GET_SUBBUF: |
585 | { | |
586 | /* | |
587 | * Random access is not allowed for metadata channel. | |
588 | */ | |
589 | return -ENOSYS; | |
590 | } | |
35097f36 JD |
591 | case RING_BUFFER_FLUSH: |
592 | { | |
593 | struct lttng_metadata_stream *stream = filp->private_data; | |
594 | struct lib_ring_buffer *buf = stream->priv; | |
595 | struct channel *chan = buf->backend.chan; | |
596 | ||
597 | /* | |
598 | * Before doing the actual ring buffer flush, write up to one | |
599 | * packet of metadata in the ring buffer. | |
600 | */ | |
601 | ret = lttng_metadata_output_channel(stream, chan); | |
602 | if (ret < 0) | |
603 | goto err; | |
604 | break; | |
605 | } | |
d83004aa JD |
606 | default: |
607 | break; | |
608 | } | |
f613e3e6 MD |
609 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
610 | ||
d83004aa | 611 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
612 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
613 | if (ret < 0) | |
614 | goto err; | |
d83004aa | 615 | |
f613e3e6 MD |
616 | switch (cmd) { |
617 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
618 | { | |
619 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
620 | cmd, arg); | |
621 | break; | |
622 | } | |
623 | default: | |
624 | break; | |
625 | } | |
d83004aa JD |
626 | err: |
627 | return ret; | |
628 | } | |
629 | ||
aeb9064d | 630 | #ifdef CONFIG_COMPAT |
d83004aa JD |
631 | static |
632 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
633 | unsigned int cmd, unsigned long arg) | |
634 | { | |
635 | int ret; | |
636 | struct lttng_metadata_stream *stream = filp->private_data; | |
637 | struct lib_ring_buffer *buf = stream->priv; | |
638 | ||
639 | switch (cmd) { | |
d83004aa JD |
640 | case RING_BUFFER_GET_NEXT_SUBBUF: |
641 | { | |
35097f36 JD |
642 | struct lttng_metadata_stream *stream = filp->private_data; |
643 | struct lib_ring_buffer *buf = stream->priv; | |
644 | struct channel *chan = buf->backend.chan; | |
645 | ||
646 | ret = lttng_metadata_output_channel(stream, chan); | |
647 | if (ret > 0) { | |
648 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
649 | ret = 0; | |
650 | } else if (ret < 0) | |
d83004aa JD |
651 | goto err; |
652 | break; | |
653 | } | |
f613e3e6 MD |
654 | case RING_BUFFER_GET_SUBBUF: |
655 | { | |
656 | /* | |
657 | * Random access is not allowed for metadata channel. | |
658 | */ | |
659 | return -ENOSYS; | |
660 | } | |
d83004aa JD |
661 | default: |
662 | break; | |
663 | } | |
f613e3e6 MD |
664 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
665 | ||
d83004aa | 666 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
667 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
668 | if (ret < 0) | |
669 | goto err; | |
d83004aa | 670 | |
f613e3e6 MD |
671 | switch (cmd) { |
672 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
673 | { | |
674 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
675 | cmd, arg); | |
676 | break; | |
677 | } | |
678 | default: | |
679 | break; | |
680 | } | |
d83004aa JD |
681 | err: |
682 | return ret; | |
683 | } | |
aeb9064d | 684 | #endif |
d83004aa | 685 | |
b3b8072b MD |
686 | /* |
687 | * This is not used by anonymous file descriptors. This code is left | |
688 | * there if we ever want to implement an inode with open() operation. | |
689 | */ | |
d83004aa JD |
690 | static |
691 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
692 | { | |
693 | struct lttng_metadata_stream *stream = inode->i_private; | |
694 | struct lib_ring_buffer *buf = stream->priv; | |
695 | ||
696 | file->private_data = buf; | |
b3b8072b MD |
697 | /* |
698 | * Since life-time of metadata cache differs from that of | |
699 | * session, we need to keep our own reference on the transport. | |
700 | */ | |
701 | if (!try_module_get(stream->transport->owner)) { | |
702 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
703 | return -EBUSY; | |
704 | } | |
d83004aa JD |
705 | return lib_ring_buffer_open(inode, file, buf); |
706 | } | |
707 | ||
708 | static | |
709 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
710 | { | |
711 | struct lttng_metadata_stream *stream = file->private_data; | |
712 | struct lib_ring_buffer *buf = stream->priv; | |
713 | ||
714 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 715 | module_put(stream->transport->owner); |
d83004aa JD |
716 | return lib_ring_buffer_release(inode, file, buf); |
717 | } | |
718 | ||
719 | static | |
720 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
721 | struct pipe_inode_info *pipe, size_t len, | |
722 | unsigned int flags) | |
723 | { | |
724 | struct lttng_metadata_stream *stream = in->private_data; | |
725 | struct lib_ring_buffer *buf = stream->priv; | |
726 | ||
727 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
728 | flags, buf); | |
729 | } | |
730 | ||
731 | static | |
732 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
733 | struct vm_area_struct *vma) | |
734 | { | |
735 | struct lttng_metadata_stream *stream = filp->private_data; | |
736 | struct lib_ring_buffer *buf = stream->priv; | |
737 | ||
738 | return lib_ring_buffer_mmap(filp, vma, buf); | |
739 | } | |
740 | ||
741 | static | |
742 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
743 | .owner = THIS_MODULE, | |
744 | .open = lttng_metadata_ring_buffer_open, | |
745 | .release = lttng_metadata_ring_buffer_release, | |
746 | .poll = lttng_metadata_ring_buffer_poll, | |
747 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
748 | .mmap = lttng_metadata_ring_buffer_mmap, | |
749 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
750 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
751 | #ifdef CONFIG_COMPAT | |
752 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
753 | #endif | |
754 | }; | |
755 | ||
756 | static | |
757 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
758 | const struct file_operations *fops) | |
ad1c05e1 | 759 | { |
ad1c05e1 | 760 | int stream_fd, ret; |
11b5a3c2 | 761 | struct file *stream_file; |
ad1c05e1 | 762 | |
1c25284c | 763 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
764 | if (stream_fd < 0) { |
765 | ret = stream_fd; | |
766 | goto fd_error; | |
767 | } | |
d83004aa JD |
768 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
769 | stream_priv, O_RDWR); | |
c0e31d2e MD |
770 | if (IS_ERR(stream_file)) { |
771 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
772 | goto file_error; |
773 | } | |
409453cb MD |
774 | /* |
775 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
776 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
777 | * file descriptor, so we set FMODE_PREAD here. | |
778 | */ | |
d7b6f197 | 779 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 780 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
781 | /* |
782 | * The stream holds a reference to the channel within the generic ring | |
783 | * buffer library, so no need to hold a refcount on the channel and | |
784 | * session files here. | |
785 | */ | |
ad1c05e1 MD |
786 | return stream_fd; |
787 | ||
788 | file_error: | |
789 | put_unused_fd(stream_fd); | |
d83004aa JD |
790 | fd_error: |
791 | return ret; | |
792 | } | |
793 | ||
794 | static | |
795 | int lttng_abi_open_stream(struct file *channel_file) | |
796 | { | |
797 | struct lttng_channel *channel = channel_file->private_data; | |
798 | struct lib_ring_buffer *buf; | |
799 | int ret; | |
800 | void *stream_priv; | |
801 | ||
802 | buf = channel->ops->buffer_read_open(channel->chan); | |
803 | if (!buf) | |
804 | return -ENOENT; | |
805 | ||
806 | stream_priv = buf; | |
807 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 808 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
809 | if (ret < 0) |
810 | goto fd_error; | |
811 | ||
812 | return ret; | |
813 | ||
814 | fd_error: | |
815 | channel->ops->buffer_read_close(buf); | |
816 | return ret; | |
817 | } | |
818 | ||
819 | static | |
820 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
821 | { | |
822 | struct lttng_channel *channel = channel_file->private_data; | |
823 | struct lttng_session *session = channel->session; | |
824 | struct lib_ring_buffer *buf; | |
825 | int ret; | |
826 | struct lttng_metadata_stream *metadata_stream; | |
827 | void *stream_priv; | |
828 | ||
829 | buf = channel->ops->buffer_read_open(channel->chan); | |
830 | if (!buf) | |
831 | return -ENOENT; | |
832 | ||
833 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
834 | GFP_KERNEL); | |
b3b8072b MD |
835 | if (!metadata_stream) { |
836 | ret = -ENOMEM; | |
837 | goto nomem; | |
838 | } | |
d83004aa JD |
839 | metadata_stream->metadata_cache = session->metadata_cache; |
840 | init_waitqueue_head(&metadata_stream->read_wait); | |
841 | metadata_stream->priv = buf; | |
842 | stream_priv = metadata_stream; | |
b3b8072b | 843 | metadata_stream->transport = channel->transport; |
de23d59d | 844 | mutex_init(&metadata_stream->lock); |
b3b8072b MD |
845 | |
846 | /* | |
847 | * Since life-time of metadata cache differs from that of | |
848 | * session, we need to keep our own reference on the transport. | |
849 | */ | |
850 | if (!try_module_get(metadata_stream->transport->owner)) { | |
851 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
852 | ret = -EINVAL; | |
853 | goto notransport; | |
854 | } | |
855 | ||
d83004aa JD |
856 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
857 | <tng_metadata_ring_buffer_file_operations); | |
858 | if (ret < 0) | |
859 | goto fd_error; | |
860 | ||
861 | kref_get(&session->metadata_cache->refcount); | |
862 | list_add(&metadata_stream->list, | |
863 | &session->metadata_cache->metadata_stream); | |
864 | return ret; | |
865 | ||
ad1c05e1 | 866 | fd_error: |
b3b8072b MD |
867 | module_put(metadata_stream->transport->owner); |
868 | notransport: | |
869 | kfree(metadata_stream); | |
870 | nomem: | |
11b5a3c2 | 871 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
872 | return ret; |
873 | } | |
874 | ||
653fe716 | 875 | static |
c0e31d2e | 876 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 877 | struct lttng_kernel_event *event_param) |
653fe716 | 878 | { |
a90917c3 MD |
879 | struct lttng_channel *channel = channel_file->private_data; |
880 | struct lttng_event *event; | |
653fe716 | 881 | int event_fd, ret; |
11b5a3c2 | 882 | struct file *event_file; |
653fe716 | 883 | |
6dccd6c1 JD |
884 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
885 | switch (event_param->instrumentation) { | |
7371f44c | 886 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 887 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 888 | break; |
ab2277d6 | 889 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 890 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 891 | break; |
ab2277d6 | 892 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 893 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
894 | break; |
895 | default: | |
896 | break; | |
897 | } | |
6dccd6c1 | 898 | switch (event_param->instrumentation) { |
1ec65de1 MD |
899 | default: |
900 | event_fd = get_unused_fd(); | |
901 | if (event_fd < 0) { | |
902 | ret = event_fd; | |
903 | goto fd_error; | |
904 | } | |
905 | event_file = anon_inode_getfile("[lttng_event]", | |
906 | <tng_event_fops, | |
907 | NULL, O_RDWR); | |
908 | if (IS_ERR(event_file)) { | |
909 | ret = PTR_ERR(event_file); | |
910 | goto file_error; | |
911 | } | |
912 | /* | |
913 | * We tolerate no failure path after event creation. It | |
914 | * will stay invariant for the rest of the session. | |
915 | */ | |
6dccd6c1 | 916 | event = lttng_event_create(channel, event_param, NULL, NULL); |
abc0446a MD |
917 | WARN_ON_ONCE(!event); |
918 | if (IS_ERR(event)) { | |
919 | ret = PTR_ERR(event); | |
1ec65de1 MD |
920 | goto event_error; |
921 | } | |
922 | event_file->private_data = event; | |
923 | fd_install(event_fd, event_file); | |
924 | /* The event holds a reference on the channel */ | |
925 | atomic_long_inc(&channel_file->f_count); | |
926 | break; | |
43880ee8 | 927 | case LTTNG_KERNEL_SYSCALL: |
1ec65de1 MD |
928 | ret = lttng_syscalls_register(channel, NULL); |
929 | if (ret) | |
930 | goto fd_error; | |
931 | event_fd = 0; | |
80f87dd2 MD |
932 | if (event_param->u.syscall.disable) { |
933 | ret = lttng_syscall_filter_disable(channel, | |
934 | event_param->name[0] == '\0' ? | |
935 | NULL : event_param->name); | |
936 | if (ret) | |
937 | goto fd_error; | |
938 | } else { | |
939 | ret = lttng_syscall_filter_enable(channel, | |
940 | event_param->name[0] == '\0' ? | |
941 | NULL : event_param->name); | |
942 | if (ret) | |
943 | goto fd_error; | |
944 | } | |
1ec65de1 | 945 | break; |
03037b98 | 946 | } |
653fe716 MD |
947 | return event_fd; |
948 | ||
03037b98 | 949 | event_error: |
c0e31d2e | 950 | fput(event_file); |
653fe716 MD |
951 | file_error: |
952 | put_unused_fd(event_fd); | |
953 | fd_error: | |
653fe716 MD |
954 | return ret; |
955 | } | |
ad1c05e1 MD |
956 | |
957 | /** | |
958 | * lttng_channel_ioctl - lttng syscall through ioctl | |
959 | * | |
c0e31d2e | 960 | * @file: the file |
ad1c05e1 MD |
961 | * @cmd: the command |
962 | * @arg: command arg | |
963 | * | |
964 | * This ioctl implements lttng commands: | |
38d024ae | 965 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
966 | * Returns an event stream file descriptor or failure. |
967 | * (typically, one event stream records events from one CPU) | |
38d024ae | 968 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 969 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
970 | * LTTNG_KERNEL_CONTEXT |
971 | * Prepend a context field to each event in the channel | |
e64957da MD |
972 | * LTTNG_KERNEL_ENABLE |
973 | * Enable recording for events in this channel (weak enable) | |
974 | * LTTNG_KERNEL_DISABLE | |
975 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 976 | * |
baf20995 MD |
977 | * Channel and event file descriptors also hold a reference on the session. |
978 | */ | |
ad1c05e1 | 979 | static |
c0e31d2e | 980 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 981 | { |
a90917c3 | 982 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 983 | |
baf20995 | 984 | switch (cmd) { |
6dccd6c1 | 985 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 986 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 987 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
988 | case LTTNG_KERNEL_OLD_EVENT: |
989 | { | |
990 | struct lttng_kernel_event *uevent_param; | |
991 | struct lttng_kernel_old_event *old_uevent_param; | |
992 | int ret; | |
993 | ||
994 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
995 | GFP_KERNEL); | |
996 | if (!uevent_param) { | |
997 | ret = -ENOMEM; | |
998 | goto old_event_end; | |
999 | } | |
1000 | old_uevent_param = kmalloc( | |
1001 | sizeof(struct lttng_kernel_old_event), | |
1002 | GFP_KERNEL); | |
1003 | if (!old_uevent_param) { | |
1004 | ret = -ENOMEM; | |
1005 | goto old_event_error_free_param; | |
1006 | } | |
1007 | if (copy_from_user(old_uevent_param, | |
1008 | (struct lttng_kernel_old_event __user *) arg, | |
1009 | sizeof(struct lttng_kernel_old_event))) { | |
1010 | ret = -EFAULT; | |
1011 | goto old_event_error_free_old_param; | |
1012 | } | |
1013 | ||
1014 | memcpy(uevent_param->name, old_uevent_param->name, | |
1015 | sizeof(uevent_param->name)); | |
1016 | uevent_param->instrumentation = | |
1017 | old_uevent_param->instrumentation; | |
1018 | ||
1019 | switch (old_uevent_param->instrumentation) { | |
1020 | case LTTNG_KERNEL_KPROBE: | |
1021 | uevent_param->u.kprobe.addr = | |
1022 | old_uevent_param->u.kprobe.addr; | |
1023 | uevent_param->u.kprobe.offset = | |
1024 | old_uevent_param->u.kprobe.offset; | |
1025 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1026 | old_uevent_param->u.kprobe.symbol_name, | |
1027 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1028 | break; | |
1029 | case LTTNG_KERNEL_KRETPROBE: | |
1030 | uevent_param->u.kretprobe.addr = | |
1031 | old_uevent_param->u.kretprobe.addr; | |
1032 | uevent_param->u.kretprobe.offset = | |
1033 | old_uevent_param->u.kretprobe.offset; | |
1034 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1035 | old_uevent_param->u.kretprobe.symbol_name, | |
1036 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1037 | break; | |
1038 | case LTTNG_KERNEL_FUNCTION: | |
1039 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1040 | old_uevent_param->u.ftrace.symbol_name, | |
1041 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1042 | break; | |
1043 | default: | |
1044 | break; | |
1045 | } | |
1046 | ret = lttng_abi_create_event(file, uevent_param); | |
1047 | ||
1048 | old_event_error_free_old_param: | |
1049 | kfree(old_uevent_param); | |
1050 | old_event_error_free_param: | |
1051 | kfree(uevent_param); | |
1052 | old_event_end: | |
1053 | return ret; | |
1054 | } | |
38d024ae | 1055 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1056 | { |
1057 | struct lttng_kernel_event uevent_param; | |
1058 | ||
1059 | if (copy_from_user(&uevent_param, | |
1060 | (struct lttng_kernel_event __user *) arg, | |
1061 | sizeof(uevent_param))) | |
1062 | return -EFAULT; | |
1063 | return lttng_abi_create_event(file, &uevent_param); | |
1064 | } | |
1065 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1066 | { | |
1067 | struct lttng_kernel_context *ucontext_param; | |
1068 | struct lttng_kernel_old_context *old_ucontext_param; | |
1069 | int ret; | |
1070 | ||
1071 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1072 | GFP_KERNEL); | |
1073 | if (!ucontext_param) { | |
1074 | ret = -ENOMEM; | |
1075 | goto old_ctx_end; | |
1076 | } | |
1077 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1078 | GFP_KERNEL); | |
1079 | if (!old_ucontext_param) { | |
1080 | ret = -ENOMEM; | |
1081 | goto old_ctx_error_free_param; | |
1082 | } | |
1083 | ||
1084 | if (copy_from_user(old_ucontext_param, | |
1085 | (struct lttng_kernel_old_context __user *) arg, | |
1086 | sizeof(struct lttng_kernel_old_context))) { | |
1087 | ret = -EFAULT; | |
1088 | goto old_ctx_error_free_old_param; | |
1089 | } | |
1090 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1091 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1092 | sizeof(ucontext_param->padding)); | |
1093 | /* only type that uses the union */ | |
1094 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1095 | ucontext_param->u.perf_counter.type = | |
1096 | old_ucontext_param->u.perf_counter.type; | |
1097 | ucontext_param->u.perf_counter.config = | |
1098 | old_ucontext_param->u.perf_counter.config; | |
1099 | memcpy(ucontext_param->u.perf_counter.name, | |
1100 | old_ucontext_param->u.perf_counter.name, | |
1101 | sizeof(ucontext_param->u.perf_counter.name)); | |
1102 | } | |
1103 | ||
1104 | ret = lttng_abi_add_context(file, | |
1105 | ucontext_param, | |
1106 | &channel->ctx, channel->session); | |
1107 | ||
1108 | old_ctx_error_free_old_param: | |
1109 | kfree(old_ucontext_param); | |
1110 | old_ctx_error_free_param: | |
1111 | kfree(ucontext_param); | |
1112 | old_ctx_end: | |
1113 | return ret; | |
1114 | } | |
8070f5c0 | 1115 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1116 | { |
1117 | struct lttng_kernel_context ucontext_param; | |
1118 | ||
1119 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1120 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1121 | sizeof(ucontext_param))) |
1122 | return -EFAULT; | |
1123 | return lttng_abi_add_context(file, | |
1124 | &ucontext_param, | |
8070f5c0 | 1125 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1126 | } |
1127 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1128 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1129 | return lttng_channel_enable(channel); |
6dccd6c1 | 1130 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1131 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1132 | return lttng_channel_disable(channel); |
baf20995 MD |
1133 | default: |
1134 | return -ENOIOCTLCMD; | |
1135 | } | |
6dccd6c1 | 1136 | |
baf20995 MD |
1137 | } |
1138 | ||
5dbbdb43 MD |
1139 | /** |
1140 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1141 | * | |
1142 | * @file: the file | |
1143 | * @cmd: the command | |
1144 | * @arg: command arg | |
1145 | * | |
1146 | * This ioctl implements lttng commands: | |
38d024ae | 1147 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1148 | * Returns an event stream file descriptor or failure. |
1149 | * | |
1150 | * Channel and event file descriptors also hold a reference on the session. | |
1151 | */ | |
1152 | static | |
1153 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1154 | { | |
1155 | switch (cmd) { | |
6dccd6c1 | 1156 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1157 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1158 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1159 | default: |
1160 | return -ENOIOCTLCMD; | |
1161 | } | |
1162 | } | |
1163 | ||
653fe716 MD |
1164 | /** |
1165 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1166 | * | |
c0e31d2e | 1167 | * @file: the file |
653fe716 MD |
1168 | * @wait: poll table |
1169 | */ | |
c0e31d2e | 1170 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1171 | { |
a90917c3 | 1172 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1173 | unsigned int mask = 0; |
1174 | ||
c0e31d2e | 1175 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1176 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1177 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1178 | wait); | |
653fe716 | 1179 | |
254ec7bc MD |
1180 | if (channel->ops->is_disabled(channel->chan)) |
1181 | return POLLERR; | |
24cedcfe | 1182 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1183 | return POLLHUP; |
f71ecafa | 1184 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1185 | return POLLIN | POLLRDNORM; |
f71ecafa | 1186 | return 0; |
653fe716 MD |
1187 | } |
1188 | return mask; | |
1189 | ||
1190 | } | |
1191 | ||
0a84a57f MD |
1192 | static |
1193 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1194 | { | |
a90917c3 | 1195 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1196 | |
1197 | if (channel) | |
1198 | fput(channel->session->file); | |
0a84a57f MD |
1199 | return 0; |
1200 | } | |
1201 | ||
d83004aa JD |
1202 | static |
1203 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1204 | { | |
1205 | struct lttng_channel *channel = file->private_data; | |
1206 | ||
1207 | if (channel) { | |
1208 | lttng_metadata_channel_destroy(channel); | |
1209 | fput(channel->session->file); | |
1210 | } | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
ad1c05e1 | 1215 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1216 | .owner = THIS_MODULE, |
03037b98 | 1217 | .release = lttng_channel_release, |
653fe716 | 1218 | .poll = lttng_channel_poll, |
ad1c05e1 | 1219 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1220 | #ifdef CONFIG_COMPAT |
03037b98 | 1221 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1222 | #endif |
11b5a3c2 | 1223 | }; |
baf20995 | 1224 | |
5dbbdb43 | 1225 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1226 | .owner = THIS_MODULE, |
d83004aa | 1227 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1228 | .unlocked_ioctl = lttng_metadata_ioctl, |
1229 | #ifdef CONFIG_COMPAT | |
1230 | .compat_ioctl = lttng_metadata_ioctl, | |
1231 | #endif | |
1232 | }; | |
1233 | ||
8070f5c0 MD |
1234 | /** |
1235 | * lttng_event_ioctl - lttng syscall through ioctl | |
1236 | * | |
1237 | * @file: the file | |
1238 | * @cmd: the command | |
1239 | * @arg: command arg | |
1240 | * | |
1241 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1242 | * LTTNG_KERNEL_CONTEXT |
1243 | * Prepend a context field to each record of this event | |
e64957da MD |
1244 | * LTTNG_KERNEL_ENABLE |
1245 | * Enable recording for this event (weak enable) | |
1246 | * LTTNG_KERNEL_DISABLE | |
1247 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1248 | */ |
1249 | static | |
1250 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1251 | { | |
a90917c3 | 1252 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
1253 | |
1254 | switch (cmd) { | |
6dccd6c1 JD |
1255 | case LTTNG_KERNEL_OLD_CONTEXT: |
1256 | { | |
1257 | struct lttng_kernel_context *ucontext_param; | |
1258 | struct lttng_kernel_old_context *old_ucontext_param; | |
1259 | int ret; | |
1260 | ||
1261 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1262 | GFP_KERNEL); | |
1263 | if (!ucontext_param) { | |
1264 | ret = -ENOMEM; | |
1265 | goto old_ctx_end; | |
1266 | } | |
1267 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1268 | GFP_KERNEL); | |
1269 | if (!old_ucontext_param) { | |
1270 | ret = -ENOMEM; | |
1271 | goto old_ctx_error_free_param; | |
1272 | } | |
1273 | ||
1274 | if (copy_from_user(old_ucontext_param, | |
1275 | (struct lttng_kernel_old_context __user *) arg, | |
1276 | sizeof(struct lttng_kernel_old_context))) { | |
1277 | ret = -EFAULT; | |
1278 | goto old_ctx_error_free_old_param; | |
1279 | } | |
1280 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1281 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1282 | sizeof(ucontext_param->padding)); | |
1283 | /* only type that uses the union */ | |
1284 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1285 | ucontext_param->u.perf_counter.type = | |
1286 | old_ucontext_param->u.perf_counter.type; | |
1287 | ucontext_param->u.perf_counter.config = | |
1288 | old_ucontext_param->u.perf_counter.config; | |
1289 | memcpy(ucontext_param->u.perf_counter.name, | |
1290 | old_ucontext_param->u.perf_counter.name, | |
1291 | sizeof(ucontext_param->u.perf_counter.name)); | |
1292 | } | |
1293 | ||
1294 | ret = lttng_abi_add_context(file, | |
1295 | ucontext_param, | |
1296 | &event->ctx, event->chan->session); | |
1297 | ||
1298 | old_ctx_error_free_old_param: | |
1299 | kfree(old_ucontext_param); | |
1300 | old_ctx_error_free_param: | |
1301 | kfree(ucontext_param); | |
1302 | old_ctx_end: | |
1303 | return ret; | |
1304 | } | |
8070f5c0 | 1305 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1306 | { |
1307 | struct lttng_kernel_context ucontext_param; | |
1308 | ||
1309 | if (copy_from_user(&ucontext_param, | |
1310 | (struct lttng_kernel_context __user *) arg, | |
1311 | sizeof(ucontext_param))) | |
1312 | return -EFAULT; | |
8070f5c0 | 1313 | return lttng_abi_add_context(file, |
6dccd6c1 | 1314 | &ucontext_param, |
8070f5c0 | 1315 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
1316 | } |
1317 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1318 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1319 | return lttng_event_enable(event); |
6dccd6c1 | 1320 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1321 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1322 | return lttng_event_disable(event); |
8070f5c0 MD |
1323 | default: |
1324 | return -ENOIOCTLCMD; | |
1325 | } | |
1326 | } | |
1327 | ||
0a84a57f MD |
1328 | static |
1329 | int lttng_event_release(struct inode *inode, struct file *file) | |
1330 | { | |
a90917c3 | 1331 | struct lttng_event *event = file->private_data; |
c269fff4 | 1332 | |
aa7c23a9 | 1333 | if (event) |
c269fff4 | 1334 | fput(event->chan->file); |
0a84a57f MD |
1335 | return 0; |
1336 | } | |
1337 | ||
3b923e5b | 1338 | /* TODO: filter control ioctl */ |
0a84a57f | 1339 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1340 | .owner = THIS_MODULE, |
0a84a57f | 1341 | .release = lttng_event_release, |
8070f5c0 MD |
1342 | .unlocked_ioctl = lttng_event_ioctl, |
1343 | #ifdef CONFIG_COMPAT | |
1344 | .compat_ioctl = lttng_event_ioctl, | |
1345 | #endif | |
11b5a3c2 | 1346 | }; |
0a84a57f | 1347 | |
3b731ab1 JD |
1348 | static int put_u64(uint64_t val, unsigned long arg) |
1349 | { | |
1350 | return put_user(val, (uint64_t __user *) arg); | |
1351 | } | |
1352 | ||
ed8d02d6 JD |
1353 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1354 | unsigned int cmd, unsigned long arg) | |
1355 | { | |
3b731ab1 JD |
1356 | struct lib_ring_buffer *buf = filp->private_data; |
1357 | struct channel *chan = buf->backend.chan; | |
1358 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1359 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1360 | int ret; |
1361 | ||
1362 | if (atomic_read(&chan->record_disabled)) | |
1363 | return -EIO; | |
1364 | ||
ed8d02d6 | 1365 | switch (cmd) { |
3b731ab1 JD |
1366 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1367 | { | |
1368 | uint64_t ts; | |
1369 | ||
dd5a0db3 | 1370 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1371 | if (ret < 0) |
1372 | goto error; | |
1373 | return put_u64(ts, arg); | |
1374 | } | |
1375 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1376 | { | |
1377 | uint64_t ts; | |
1378 | ||
dd5a0db3 | 1379 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1380 | if (ret < 0) |
1381 | goto error; | |
1382 | return put_u64(ts, arg); | |
1383 | } | |
1384 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1385 | { | |
1386 | uint64_t ed; | |
1387 | ||
dd5a0db3 | 1388 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1389 | if (ret < 0) |
1390 | goto error; | |
1391 | return put_u64(ed, arg); | |
1392 | } | |
1393 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1394 | { | |
1395 | uint64_t cs; | |
1396 | ||
dd5a0db3 | 1397 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1398 | if (ret < 0) |
1399 | goto error; | |
1400 | return put_u64(cs, arg); | |
1401 | } | |
1402 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1403 | { | |
1404 | uint64_t ps; | |
1405 | ||
dd5a0db3 | 1406 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1407 | if (ret < 0) |
1408 | goto error; | |
1409 | return put_u64(ps, arg); | |
1410 | } | |
1411 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1412 | { | |
1413 | uint64_t si; | |
1414 | ||
dd5a0db3 | 1415 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1416 | if (ret < 0) |
1417 | goto error; | |
1418 | return put_u64(si, arg); | |
1419 | } | |
2348ca17 JD |
1420 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1421 | { | |
1422 | uint64_t ts; | |
1423 | ||
dd5a0db3 | 1424 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1425 | if (ret < 0) |
1426 | goto error; | |
1427 | return put_u64(ts, arg); | |
1428 | } | |
3b731ab1 JD |
1429 | default: |
1430 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1431 | cmd, arg); | |
ed8d02d6 | 1432 | } |
3b731ab1 JD |
1433 | |
1434 | error: | |
1435 | return -ENOSYS; | |
ed8d02d6 JD |
1436 | } |
1437 | ||
1438 | #ifdef CONFIG_COMPAT | |
1439 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1440 | unsigned int cmd, unsigned long arg) | |
1441 | { | |
3b731ab1 JD |
1442 | struct lib_ring_buffer *buf = filp->private_data; |
1443 | struct channel *chan = buf->backend.chan; | |
1444 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1445 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1446 | int ret; |
1447 | ||
1448 | if (atomic_read(&chan->record_disabled)) | |
1449 | return -EIO; | |
1450 | ||
ed8d02d6 | 1451 | switch (cmd) { |
3b731ab1 JD |
1452 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1453 | { | |
1454 | uint64_t ts; | |
1455 | ||
dd5a0db3 | 1456 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1457 | if (ret < 0) |
1458 | goto error; | |
1459 | return put_u64(ts, arg); | |
1460 | } | |
1461 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1462 | { | |
1463 | uint64_t ts; | |
1464 | ||
dd5a0db3 | 1465 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1466 | if (ret < 0) |
1467 | goto error; | |
1468 | return put_u64(ts, arg); | |
1469 | } | |
1470 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1471 | { | |
1472 | uint64_t ed; | |
1473 | ||
dd5a0db3 | 1474 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1475 | if (ret < 0) |
1476 | goto error; | |
1477 | return put_u64(ed, arg); | |
ed8d02d6 | 1478 | } |
3b731ab1 JD |
1479 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1480 | { | |
1481 | uint64_t cs; | |
1482 | ||
dd5a0db3 | 1483 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1484 | if (ret < 0) |
1485 | goto error; | |
1486 | return put_u64(cs, arg); | |
1487 | } | |
1488 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1489 | { | |
1490 | uint64_t ps; | |
1491 | ||
dd5a0db3 | 1492 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1493 | if (ret < 0) |
1494 | goto error; | |
1495 | return put_u64(ps, arg); | |
1496 | } | |
1497 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1498 | { | |
1499 | uint64_t si; | |
1500 | ||
dd5a0db3 | 1501 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1502 | if (ret < 0) |
1503 | goto error; | |
1504 | return put_u64(si, arg); | |
1505 | } | |
2348ca17 JD |
1506 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1507 | { | |
1508 | uint64_t ts; | |
1509 | ||
dd5a0db3 | 1510 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1511 | if (ret < 0) |
1512 | goto error; | |
1513 | return put_u64(ts, arg); | |
1514 | } | |
3b731ab1 JD |
1515 | default: |
1516 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1517 | cmd, arg); | |
1518 | } | |
1519 | ||
1520 | error: | |
1521 | return -ENOSYS; | |
ed8d02d6 JD |
1522 | } |
1523 | #endif /* CONFIG_COMPAT */ | |
1524 | ||
1525 | static void lttng_stream_override_ring_buffer_fops(void) | |
1526 | { | |
1527 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1528 | lttng_stream_ring_buffer_file_operations.open = | |
1529 | lib_ring_buffer_file_operations.open; | |
1530 | lttng_stream_ring_buffer_file_operations.release = | |
1531 | lib_ring_buffer_file_operations.release; | |
1532 | lttng_stream_ring_buffer_file_operations.poll = | |
1533 | lib_ring_buffer_file_operations.poll; | |
1534 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1535 | lib_ring_buffer_file_operations.splice_read; | |
1536 | lttng_stream_ring_buffer_file_operations.mmap = | |
1537 | lib_ring_buffer_file_operations.mmap; | |
1538 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1539 | lttng_stream_ring_buffer_ioctl; | |
1540 | lttng_stream_ring_buffer_file_operations.llseek = | |
1541 | lib_ring_buffer_file_operations.llseek; | |
1542 | #ifdef CONFIG_COMPAT | |
1543 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1544 | lttng_stream_ring_buffer_compat_ioctl; | |
1545 | #endif | |
1546 | } | |
1547 | ||
80996790 | 1548 | int __init lttng_abi_init(void) |
baf20995 MD |
1549 | { |
1550 | int ret = 0; | |
1551 | ||
6d2a620c | 1552 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1553 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1554 | <tng_fops, NULL); |
1555 | ||
255e52a4 | 1556 | if (!lttng_proc_dentry) { |
baf20995 MD |
1557 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1558 | ret = -ENOMEM; | |
1559 | goto error; | |
1560 | } | |
ed8d02d6 JD |
1561 | lttng_stream_override_ring_buffer_fops(); |
1562 | ||
baf20995 MD |
1563 | error: |
1564 | return ret; | |
1565 | } | |
1566 | ||
e6e65fcd MD |
1567 | /* No __exit annotation because used by init error path too. */ |
1568 | void lttng_abi_exit(void) | |
baf20995 | 1569 | { |
e6a17f26 MD |
1570 | if (lttng_proc_dentry) |
1571 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1572 | } |