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 | ||
54028e45 | 544 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 545 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 546 | stream->metadata_out) |
d83004aa | 547 | mask |= POLLIN; |
54028e45 | 548 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
549 | } |
550 | ||
551 | return mask; | |
552 | } | |
553 | ||
f613e3e6 MD |
554 | static |
555 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
556 | unsigned int cmd, unsigned long arg) | |
557 | { | |
558 | struct lttng_metadata_stream *stream = filp->private_data; | |
559 | ||
560 | stream->metadata_out = stream->metadata_in; | |
561 | } | |
562 | ||
d83004aa JD |
563 | static |
564 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
565 | unsigned int cmd, unsigned long arg) | |
566 | { | |
567 | int ret; | |
568 | struct lttng_metadata_stream *stream = filp->private_data; | |
569 | struct lib_ring_buffer *buf = stream->priv; | |
570 | ||
571 | switch (cmd) { | |
d83004aa JD |
572 | case RING_BUFFER_GET_NEXT_SUBBUF: |
573 | { | |
35097f36 JD |
574 | struct lttng_metadata_stream *stream = filp->private_data; |
575 | struct lib_ring_buffer *buf = stream->priv; | |
576 | struct channel *chan = buf->backend.chan; | |
577 | ||
578 | ret = lttng_metadata_output_channel(stream, chan); | |
579 | if (ret > 0) { | |
580 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
581 | ret = 0; | |
582 | } else if (ret < 0) | |
d83004aa JD |
583 | goto err; |
584 | break; | |
585 | } | |
f613e3e6 MD |
586 | case RING_BUFFER_GET_SUBBUF: |
587 | { | |
588 | /* | |
589 | * Random access is not allowed for metadata channel. | |
590 | */ | |
591 | return -ENOSYS; | |
592 | } | |
35097f36 JD |
593 | case RING_BUFFER_FLUSH: |
594 | { | |
595 | struct lttng_metadata_stream *stream = filp->private_data; | |
596 | struct lib_ring_buffer *buf = stream->priv; | |
597 | struct channel *chan = buf->backend.chan; | |
598 | ||
599 | /* | |
600 | * Before doing the actual ring buffer flush, write up to one | |
601 | * packet of metadata in the ring buffer. | |
602 | */ | |
603 | ret = lttng_metadata_output_channel(stream, chan); | |
604 | if (ret < 0) | |
605 | goto err; | |
606 | break; | |
607 | } | |
d83004aa JD |
608 | default: |
609 | break; | |
610 | } | |
f613e3e6 MD |
611 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
612 | ||
d83004aa | 613 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
614 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
615 | if (ret < 0) | |
616 | goto err; | |
d83004aa | 617 | |
f613e3e6 MD |
618 | switch (cmd) { |
619 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
620 | { | |
621 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
622 | cmd, arg); | |
623 | break; | |
624 | } | |
625 | default: | |
626 | break; | |
627 | } | |
d83004aa JD |
628 | err: |
629 | return ret; | |
630 | } | |
631 | ||
aeb9064d | 632 | #ifdef CONFIG_COMPAT |
d83004aa JD |
633 | static |
634 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
635 | unsigned int cmd, unsigned long arg) | |
636 | { | |
637 | int ret; | |
638 | struct lttng_metadata_stream *stream = filp->private_data; | |
639 | struct lib_ring_buffer *buf = stream->priv; | |
640 | ||
641 | switch (cmd) { | |
d83004aa JD |
642 | case RING_BUFFER_GET_NEXT_SUBBUF: |
643 | { | |
35097f36 JD |
644 | struct lttng_metadata_stream *stream = filp->private_data; |
645 | struct lib_ring_buffer *buf = stream->priv; | |
646 | struct channel *chan = buf->backend.chan; | |
647 | ||
648 | ret = lttng_metadata_output_channel(stream, chan); | |
649 | if (ret > 0) { | |
650 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
651 | ret = 0; | |
652 | } else if (ret < 0) | |
d83004aa JD |
653 | goto err; |
654 | break; | |
655 | } | |
f613e3e6 MD |
656 | case RING_BUFFER_GET_SUBBUF: |
657 | { | |
658 | /* | |
659 | * Random access is not allowed for metadata channel. | |
660 | */ | |
661 | return -ENOSYS; | |
662 | } | |
d83004aa JD |
663 | default: |
664 | break; | |
665 | } | |
f613e3e6 MD |
666 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
667 | ||
d83004aa | 668 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
669 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
670 | if (ret < 0) | |
671 | goto err; | |
d83004aa | 672 | |
f613e3e6 MD |
673 | switch (cmd) { |
674 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
675 | { | |
676 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
677 | cmd, arg); | |
678 | break; | |
679 | } | |
680 | default: | |
681 | break; | |
682 | } | |
d83004aa JD |
683 | err: |
684 | return ret; | |
685 | } | |
aeb9064d | 686 | #endif |
d83004aa | 687 | |
b3b8072b MD |
688 | /* |
689 | * This is not used by anonymous file descriptors. This code is left | |
690 | * there if we ever want to implement an inode with open() operation. | |
691 | */ | |
d83004aa JD |
692 | static |
693 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
694 | { | |
695 | struct lttng_metadata_stream *stream = inode->i_private; | |
696 | struct lib_ring_buffer *buf = stream->priv; | |
697 | ||
698 | file->private_data = buf; | |
b3b8072b MD |
699 | /* |
700 | * Since life-time of metadata cache differs from that of | |
701 | * session, we need to keep our own reference on the transport. | |
702 | */ | |
703 | if (!try_module_get(stream->transport->owner)) { | |
704 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
705 | return -EBUSY; | |
706 | } | |
d83004aa JD |
707 | return lib_ring_buffer_open(inode, file, buf); |
708 | } | |
709 | ||
710 | static | |
711 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
712 | { | |
713 | struct lttng_metadata_stream *stream = file->private_data; | |
714 | struct lib_ring_buffer *buf = stream->priv; | |
715 | ||
716 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 717 | module_put(stream->transport->owner); |
d83004aa JD |
718 | return lib_ring_buffer_release(inode, file, buf); |
719 | } | |
720 | ||
721 | static | |
722 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
723 | struct pipe_inode_info *pipe, size_t len, | |
724 | unsigned int flags) | |
725 | { | |
726 | struct lttng_metadata_stream *stream = in->private_data; | |
727 | struct lib_ring_buffer *buf = stream->priv; | |
728 | ||
729 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
730 | flags, buf); | |
731 | } | |
732 | ||
733 | static | |
734 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
735 | struct vm_area_struct *vma) | |
736 | { | |
737 | struct lttng_metadata_stream *stream = filp->private_data; | |
738 | struct lib_ring_buffer *buf = stream->priv; | |
739 | ||
740 | return lib_ring_buffer_mmap(filp, vma, buf); | |
741 | } | |
742 | ||
743 | static | |
744 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
745 | .owner = THIS_MODULE, | |
746 | .open = lttng_metadata_ring_buffer_open, | |
747 | .release = lttng_metadata_ring_buffer_release, | |
748 | .poll = lttng_metadata_ring_buffer_poll, | |
749 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
750 | .mmap = lttng_metadata_ring_buffer_mmap, | |
751 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
752 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
753 | #ifdef CONFIG_COMPAT | |
754 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
755 | #endif | |
756 | }; | |
757 | ||
758 | static | |
759 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
760 | const struct file_operations *fops) | |
ad1c05e1 | 761 | { |
ad1c05e1 | 762 | int stream_fd, ret; |
11b5a3c2 | 763 | struct file *stream_file; |
ad1c05e1 | 764 | |
1c25284c | 765 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
766 | if (stream_fd < 0) { |
767 | ret = stream_fd; | |
768 | goto fd_error; | |
769 | } | |
d83004aa JD |
770 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
771 | stream_priv, O_RDWR); | |
c0e31d2e MD |
772 | if (IS_ERR(stream_file)) { |
773 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
774 | goto file_error; |
775 | } | |
409453cb MD |
776 | /* |
777 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
778 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
779 | * file descriptor, so we set FMODE_PREAD here. | |
780 | */ | |
d7b6f197 | 781 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 782 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
783 | /* |
784 | * The stream holds a reference to the channel within the generic ring | |
785 | * buffer library, so no need to hold a refcount on the channel and | |
786 | * session files here. | |
787 | */ | |
ad1c05e1 MD |
788 | return stream_fd; |
789 | ||
790 | file_error: | |
791 | put_unused_fd(stream_fd); | |
d83004aa JD |
792 | fd_error: |
793 | return ret; | |
794 | } | |
795 | ||
796 | static | |
797 | int lttng_abi_open_stream(struct file *channel_file) | |
798 | { | |
799 | struct lttng_channel *channel = channel_file->private_data; | |
800 | struct lib_ring_buffer *buf; | |
801 | int ret; | |
802 | void *stream_priv; | |
803 | ||
804 | buf = channel->ops->buffer_read_open(channel->chan); | |
805 | if (!buf) | |
806 | return -ENOENT; | |
807 | ||
808 | stream_priv = buf; | |
809 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 810 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
811 | if (ret < 0) |
812 | goto fd_error; | |
813 | ||
814 | return ret; | |
815 | ||
816 | fd_error: | |
817 | channel->ops->buffer_read_close(buf); | |
818 | return ret; | |
819 | } | |
820 | ||
821 | static | |
822 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
823 | { | |
824 | struct lttng_channel *channel = channel_file->private_data; | |
825 | struct lttng_session *session = channel->session; | |
826 | struct lib_ring_buffer *buf; | |
827 | int ret; | |
828 | struct lttng_metadata_stream *metadata_stream; | |
829 | void *stream_priv; | |
830 | ||
831 | buf = channel->ops->buffer_read_open(channel->chan); | |
832 | if (!buf) | |
833 | return -ENOENT; | |
834 | ||
835 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
836 | GFP_KERNEL); | |
b3b8072b MD |
837 | if (!metadata_stream) { |
838 | ret = -ENOMEM; | |
839 | goto nomem; | |
840 | } | |
d83004aa JD |
841 | metadata_stream->metadata_cache = session->metadata_cache; |
842 | init_waitqueue_head(&metadata_stream->read_wait); | |
843 | metadata_stream->priv = buf; | |
844 | stream_priv = metadata_stream; | |
b3b8072b MD |
845 | metadata_stream->transport = channel->transport; |
846 | ||
847 | /* | |
848 | * Since life-time of metadata cache differs from that of | |
849 | * session, we need to keep our own reference on the transport. | |
850 | */ | |
851 | if (!try_module_get(metadata_stream->transport->owner)) { | |
852 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
853 | ret = -EINVAL; | |
854 | goto notransport; | |
855 | } | |
856 | ||
d83004aa JD |
857 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
858 | <tng_metadata_ring_buffer_file_operations); | |
859 | if (ret < 0) | |
860 | goto fd_error; | |
861 | ||
862 | kref_get(&session->metadata_cache->refcount); | |
863 | list_add(&metadata_stream->list, | |
864 | &session->metadata_cache->metadata_stream); | |
865 | return ret; | |
866 | ||
ad1c05e1 | 867 | fd_error: |
b3b8072b MD |
868 | module_put(metadata_stream->transport->owner); |
869 | notransport: | |
870 | kfree(metadata_stream); | |
871 | nomem: | |
11b5a3c2 | 872 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
873 | return ret; |
874 | } | |
875 | ||
653fe716 | 876 | static |
c0e31d2e | 877 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 878 | struct lttng_kernel_event *event_param) |
653fe716 | 879 | { |
a90917c3 MD |
880 | struct lttng_channel *channel = channel_file->private_data; |
881 | struct lttng_event *event; | |
653fe716 | 882 | int event_fd, ret; |
11b5a3c2 | 883 | struct file *event_file; |
653fe716 | 884 | |
6dccd6c1 JD |
885 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
886 | switch (event_param->instrumentation) { | |
7371f44c | 887 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 888 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 889 | break; |
ab2277d6 | 890 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 891 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 892 | break; |
ab2277d6 | 893 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 894 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
895 | break; |
896 | default: | |
897 | break; | |
898 | } | |
6dccd6c1 | 899 | switch (event_param->instrumentation) { |
1ec65de1 MD |
900 | default: |
901 | event_fd = get_unused_fd(); | |
902 | if (event_fd < 0) { | |
903 | ret = event_fd; | |
904 | goto fd_error; | |
905 | } | |
906 | event_file = anon_inode_getfile("[lttng_event]", | |
907 | <tng_event_fops, | |
908 | NULL, O_RDWR); | |
909 | if (IS_ERR(event_file)) { | |
910 | ret = PTR_ERR(event_file); | |
911 | goto file_error; | |
912 | } | |
913 | /* | |
914 | * We tolerate no failure path after event creation. It | |
915 | * will stay invariant for the rest of the session. | |
916 | */ | |
6dccd6c1 | 917 | event = lttng_event_create(channel, event_param, NULL, NULL); |
abc0446a MD |
918 | WARN_ON_ONCE(!event); |
919 | if (IS_ERR(event)) { | |
920 | ret = PTR_ERR(event); | |
1ec65de1 MD |
921 | goto event_error; |
922 | } | |
923 | event_file->private_data = event; | |
924 | fd_install(event_fd, event_file); | |
925 | /* The event holds a reference on the channel */ | |
926 | atomic_long_inc(&channel_file->f_count); | |
927 | break; | |
43880ee8 MD |
928 | case LTTNG_KERNEL_SYSCALL: |
929 | /* | |
930 | * Only all-syscall tracing supported for now. | |
931 | */ | |
6dccd6c1 | 932 | if (event_param->name[0] != '\0') |
43880ee8 | 933 | return -EINVAL; |
1ec65de1 MD |
934 | ret = lttng_syscalls_register(channel, NULL); |
935 | if (ret) | |
936 | goto fd_error; | |
937 | event_fd = 0; | |
938 | break; | |
03037b98 | 939 | } |
653fe716 MD |
940 | return event_fd; |
941 | ||
03037b98 | 942 | event_error: |
c0e31d2e | 943 | fput(event_file); |
653fe716 MD |
944 | file_error: |
945 | put_unused_fd(event_fd); | |
946 | fd_error: | |
653fe716 MD |
947 | return ret; |
948 | } | |
ad1c05e1 MD |
949 | |
950 | /** | |
951 | * lttng_channel_ioctl - lttng syscall through ioctl | |
952 | * | |
c0e31d2e | 953 | * @file: the file |
ad1c05e1 MD |
954 | * @cmd: the command |
955 | * @arg: command arg | |
956 | * | |
957 | * This ioctl implements lttng commands: | |
38d024ae | 958 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
959 | * Returns an event stream file descriptor or failure. |
960 | * (typically, one event stream records events from one CPU) | |
38d024ae | 961 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 962 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
963 | * LTTNG_KERNEL_CONTEXT |
964 | * Prepend a context field to each event in the channel | |
e64957da MD |
965 | * LTTNG_KERNEL_ENABLE |
966 | * Enable recording for events in this channel (weak enable) | |
967 | * LTTNG_KERNEL_DISABLE | |
968 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 969 | * |
baf20995 MD |
970 | * Channel and event file descriptors also hold a reference on the session. |
971 | */ | |
ad1c05e1 | 972 | static |
c0e31d2e | 973 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 974 | { |
a90917c3 | 975 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 976 | |
baf20995 | 977 | switch (cmd) { |
6dccd6c1 | 978 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 979 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 980 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
981 | case LTTNG_KERNEL_OLD_EVENT: |
982 | { | |
983 | struct lttng_kernel_event *uevent_param; | |
984 | struct lttng_kernel_old_event *old_uevent_param; | |
985 | int ret; | |
986 | ||
987 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
988 | GFP_KERNEL); | |
989 | if (!uevent_param) { | |
990 | ret = -ENOMEM; | |
991 | goto old_event_end; | |
992 | } | |
993 | old_uevent_param = kmalloc( | |
994 | sizeof(struct lttng_kernel_old_event), | |
995 | GFP_KERNEL); | |
996 | if (!old_uevent_param) { | |
997 | ret = -ENOMEM; | |
998 | goto old_event_error_free_param; | |
999 | } | |
1000 | if (copy_from_user(old_uevent_param, | |
1001 | (struct lttng_kernel_old_event __user *) arg, | |
1002 | sizeof(struct lttng_kernel_old_event))) { | |
1003 | ret = -EFAULT; | |
1004 | goto old_event_error_free_old_param; | |
1005 | } | |
1006 | ||
1007 | memcpy(uevent_param->name, old_uevent_param->name, | |
1008 | sizeof(uevent_param->name)); | |
1009 | uevent_param->instrumentation = | |
1010 | old_uevent_param->instrumentation; | |
1011 | ||
1012 | switch (old_uevent_param->instrumentation) { | |
1013 | case LTTNG_KERNEL_KPROBE: | |
1014 | uevent_param->u.kprobe.addr = | |
1015 | old_uevent_param->u.kprobe.addr; | |
1016 | uevent_param->u.kprobe.offset = | |
1017 | old_uevent_param->u.kprobe.offset; | |
1018 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1019 | old_uevent_param->u.kprobe.symbol_name, | |
1020 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1021 | break; | |
1022 | case LTTNG_KERNEL_KRETPROBE: | |
1023 | uevent_param->u.kretprobe.addr = | |
1024 | old_uevent_param->u.kretprobe.addr; | |
1025 | uevent_param->u.kretprobe.offset = | |
1026 | old_uevent_param->u.kretprobe.offset; | |
1027 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1028 | old_uevent_param->u.kretprobe.symbol_name, | |
1029 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1030 | break; | |
1031 | case LTTNG_KERNEL_FUNCTION: | |
1032 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1033 | old_uevent_param->u.ftrace.symbol_name, | |
1034 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1035 | break; | |
1036 | default: | |
1037 | break; | |
1038 | } | |
1039 | ret = lttng_abi_create_event(file, uevent_param); | |
1040 | ||
1041 | old_event_error_free_old_param: | |
1042 | kfree(old_uevent_param); | |
1043 | old_event_error_free_param: | |
1044 | kfree(uevent_param); | |
1045 | old_event_end: | |
1046 | return ret; | |
1047 | } | |
38d024ae | 1048 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1049 | { |
1050 | struct lttng_kernel_event uevent_param; | |
1051 | ||
1052 | if (copy_from_user(&uevent_param, | |
1053 | (struct lttng_kernel_event __user *) arg, | |
1054 | sizeof(uevent_param))) | |
1055 | return -EFAULT; | |
1056 | return lttng_abi_create_event(file, &uevent_param); | |
1057 | } | |
1058 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1059 | { | |
1060 | struct lttng_kernel_context *ucontext_param; | |
1061 | struct lttng_kernel_old_context *old_ucontext_param; | |
1062 | int ret; | |
1063 | ||
1064 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1065 | GFP_KERNEL); | |
1066 | if (!ucontext_param) { | |
1067 | ret = -ENOMEM; | |
1068 | goto old_ctx_end; | |
1069 | } | |
1070 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1071 | GFP_KERNEL); | |
1072 | if (!old_ucontext_param) { | |
1073 | ret = -ENOMEM; | |
1074 | goto old_ctx_error_free_param; | |
1075 | } | |
1076 | ||
1077 | if (copy_from_user(old_ucontext_param, | |
1078 | (struct lttng_kernel_old_context __user *) arg, | |
1079 | sizeof(struct lttng_kernel_old_context))) { | |
1080 | ret = -EFAULT; | |
1081 | goto old_ctx_error_free_old_param; | |
1082 | } | |
1083 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1084 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1085 | sizeof(ucontext_param->padding)); | |
1086 | /* only type that uses the union */ | |
1087 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1088 | ucontext_param->u.perf_counter.type = | |
1089 | old_ucontext_param->u.perf_counter.type; | |
1090 | ucontext_param->u.perf_counter.config = | |
1091 | old_ucontext_param->u.perf_counter.config; | |
1092 | memcpy(ucontext_param->u.perf_counter.name, | |
1093 | old_ucontext_param->u.perf_counter.name, | |
1094 | sizeof(ucontext_param->u.perf_counter.name)); | |
1095 | } | |
1096 | ||
1097 | ret = lttng_abi_add_context(file, | |
1098 | ucontext_param, | |
1099 | &channel->ctx, channel->session); | |
1100 | ||
1101 | old_ctx_error_free_old_param: | |
1102 | kfree(old_ucontext_param); | |
1103 | old_ctx_error_free_param: | |
1104 | kfree(ucontext_param); | |
1105 | old_ctx_end: | |
1106 | return ret; | |
1107 | } | |
8070f5c0 | 1108 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1109 | { |
1110 | struct lttng_kernel_context ucontext_param; | |
1111 | ||
1112 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1113 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1114 | sizeof(ucontext_param))) |
1115 | return -EFAULT; | |
1116 | return lttng_abi_add_context(file, | |
1117 | &ucontext_param, | |
8070f5c0 | 1118 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1119 | } |
1120 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1121 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1122 | return lttng_channel_enable(channel); |
6dccd6c1 | 1123 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1124 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1125 | return lttng_channel_disable(channel); |
baf20995 MD |
1126 | default: |
1127 | return -ENOIOCTLCMD; | |
1128 | } | |
6dccd6c1 | 1129 | |
baf20995 MD |
1130 | } |
1131 | ||
5dbbdb43 MD |
1132 | /** |
1133 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1134 | * | |
1135 | * @file: the file | |
1136 | * @cmd: the command | |
1137 | * @arg: command arg | |
1138 | * | |
1139 | * This ioctl implements lttng commands: | |
38d024ae | 1140 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1141 | * Returns an event stream file descriptor or failure. |
1142 | * | |
1143 | * Channel and event file descriptors also hold a reference on the session. | |
1144 | */ | |
1145 | static | |
1146 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1147 | { | |
1148 | switch (cmd) { | |
6dccd6c1 | 1149 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1150 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1151 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1152 | default: |
1153 | return -ENOIOCTLCMD; | |
1154 | } | |
1155 | } | |
1156 | ||
653fe716 MD |
1157 | /** |
1158 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1159 | * | |
c0e31d2e | 1160 | * @file: the file |
653fe716 MD |
1161 | * @wait: poll table |
1162 | */ | |
c0e31d2e | 1163 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1164 | { |
a90917c3 | 1165 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1166 | unsigned int mask = 0; |
1167 | ||
c0e31d2e | 1168 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1169 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1170 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1171 | wait); | |
653fe716 | 1172 | |
254ec7bc MD |
1173 | if (channel->ops->is_disabled(channel->chan)) |
1174 | return POLLERR; | |
24cedcfe | 1175 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1176 | return POLLHUP; |
f71ecafa | 1177 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1178 | return POLLIN | POLLRDNORM; |
f71ecafa | 1179 | return 0; |
653fe716 MD |
1180 | } |
1181 | return mask; | |
1182 | ||
1183 | } | |
1184 | ||
0a84a57f MD |
1185 | static |
1186 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1187 | { | |
a90917c3 | 1188 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1189 | |
1190 | if (channel) | |
1191 | fput(channel->session->file); | |
0a84a57f MD |
1192 | return 0; |
1193 | } | |
1194 | ||
d83004aa JD |
1195 | static |
1196 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1197 | { | |
1198 | struct lttng_channel *channel = file->private_data; | |
1199 | ||
1200 | if (channel) { | |
1201 | lttng_metadata_channel_destroy(channel); | |
1202 | fput(channel->session->file); | |
1203 | } | |
1204 | ||
1205 | return 0; | |
1206 | } | |
1207 | ||
ad1c05e1 | 1208 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1209 | .owner = THIS_MODULE, |
03037b98 | 1210 | .release = lttng_channel_release, |
653fe716 | 1211 | .poll = lttng_channel_poll, |
ad1c05e1 | 1212 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1213 | #ifdef CONFIG_COMPAT |
03037b98 | 1214 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1215 | #endif |
11b5a3c2 | 1216 | }; |
baf20995 | 1217 | |
5dbbdb43 | 1218 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1219 | .owner = THIS_MODULE, |
d83004aa | 1220 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1221 | .unlocked_ioctl = lttng_metadata_ioctl, |
1222 | #ifdef CONFIG_COMPAT | |
1223 | .compat_ioctl = lttng_metadata_ioctl, | |
1224 | #endif | |
1225 | }; | |
1226 | ||
8070f5c0 MD |
1227 | /** |
1228 | * lttng_event_ioctl - lttng syscall through ioctl | |
1229 | * | |
1230 | * @file: the file | |
1231 | * @cmd: the command | |
1232 | * @arg: command arg | |
1233 | * | |
1234 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1235 | * LTTNG_KERNEL_CONTEXT |
1236 | * Prepend a context field to each record of this event | |
e64957da MD |
1237 | * LTTNG_KERNEL_ENABLE |
1238 | * Enable recording for this event (weak enable) | |
1239 | * LTTNG_KERNEL_DISABLE | |
1240 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1241 | */ |
1242 | static | |
1243 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1244 | { | |
a90917c3 | 1245 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
1246 | |
1247 | switch (cmd) { | |
6dccd6c1 JD |
1248 | case LTTNG_KERNEL_OLD_CONTEXT: |
1249 | { | |
1250 | struct lttng_kernel_context *ucontext_param; | |
1251 | struct lttng_kernel_old_context *old_ucontext_param; | |
1252 | int ret; | |
1253 | ||
1254 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1255 | GFP_KERNEL); | |
1256 | if (!ucontext_param) { | |
1257 | ret = -ENOMEM; | |
1258 | goto old_ctx_end; | |
1259 | } | |
1260 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1261 | GFP_KERNEL); | |
1262 | if (!old_ucontext_param) { | |
1263 | ret = -ENOMEM; | |
1264 | goto old_ctx_error_free_param; | |
1265 | } | |
1266 | ||
1267 | if (copy_from_user(old_ucontext_param, | |
1268 | (struct lttng_kernel_old_context __user *) arg, | |
1269 | sizeof(struct lttng_kernel_old_context))) { | |
1270 | ret = -EFAULT; | |
1271 | goto old_ctx_error_free_old_param; | |
1272 | } | |
1273 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1274 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1275 | sizeof(ucontext_param->padding)); | |
1276 | /* only type that uses the union */ | |
1277 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1278 | ucontext_param->u.perf_counter.type = | |
1279 | old_ucontext_param->u.perf_counter.type; | |
1280 | ucontext_param->u.perf_counter.config = | |
1281 | old_ucontext_param->u.perf_counter.config; | |
1282 | memcpy(ucontext_param->u.perf_counter.name, | |
1283 | old_ucontext_param->u.perf_counter.name, | |
1284 | sizeof(ucontext_param->u.perf_counter.name)); | |
1285 | } | |
1286 | ||
1287 | ret = lttng_abi_add_context(file, | |
1288 | ucontext_param, | |
1289 | &event->ctx, event->chan->session); | |
1290 | ||
1291 | old_ctx_error_free_old_param: | |
1292 | kfree(old_ucontext_param); | |
1293 | old_ctx_error_free_param: | |
1294 | kfree(ucontext_param); | |
1295 | old_ctx_end: | |
1296 | return ret; | |
1297 | } | |
8070f5c0 | 1298 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1299 | { |
1300 | struct lttng_kernel_context ucontext_param; | |
1301 | ||
1302 | if (copy_from_user(&ucontext_param, | |
1303 | (struct lttng_kernel_context __user *) arg, | |
1304 | sizeof(ucontext_param))) | |
1305 | return -EFAULT; | |
8070f5c0 | 1306 | return lttng_abi_add_context(file, |
6dccd6c1 | 1307 | &ucontext_param, |
8070f5c0 | 1308 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
1309 | } |
1310 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1311 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1312 | return lttng_event_enable(event); |
6dccd6c1 | 1313 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1314 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1315 | return lttng_event_disable(event); |
8070f5c0 MD |
1316 | default: |
1317 | return -ENOIOCTLCMD; | |
1318 | } | |
1319 | } | |
1320 | ||
0a84a57f MD |
1321 | static |
1322 | int lttng_event_release(struct inode *inode, struct file *file) | |
1323 | { | |
a90917c3 | 1324 | struct lttng_event *event = file->private_data; |
c269fff4 | 1325 | |
aa7c23a9 | 1326 | if (event) |
c269fff4 | 1327 | fput(event->chan->file); |
0a84a57f MD |
1328 | return 0; |
1329 | } | |
1330 | ||
3b923e5b | 1331 | /* TODO: filter control ioctl */ |
0a84a57f | 1332 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1333 | .owner = THIS_MODULE, |
0a84a57f | 1334 | .release = lttng_event_release, |
8070f5c0 MD |
1335 | .unlocked_ioctl = lttng_event_ioctl, |
1336 | #ifdef CONFIG_COMPAT | |
1337 | .compat_ioctl = lttng_event_ioctl, | |
1338 | #endif | |
11b5a3c2 | 1339 | }; |
0a84a57f | 1340 | |
3b731ab1 JD |
1341 | static int put_u64(uint64_t val, unsigned long arg) |
1342 | { | |
1343 | return put_user(val, (uint64_t __user *) arg); | |
1344 | } | |
1345 | ||
ed8d02d6 JD |
1346 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1347 | unsigned int cmd, unsigned long arg) | |
1348 | { | |
3b731ab1 JD |
1349 | struct lib_ring_buffer *buf = filp->private_data; |
1350 | struct channel *chan = buf->backend.chan; | |
1351 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1352 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1353 | int ret; |
1354 | ||
1355 | if (atomic_read(&chan->record_disabled)) | |
1356 | return -EIO; | |
1357 | ||
ed8d02d6 | 1358 | switch (cmd) { |
3b731ab1 JD |
1359 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1360 | { | |
1361 | uint64_t ts; | |
1362 | ||
dd5a0db3 | 1363 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1364 | if (ret < 0) |
1365 | goto error; | |
1366 | return put_u64(ts, arg); | |
1367 | } | |
1368 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1369 | { | |
1370 | uint64_t ts; | |
1371 | ||
dd5a0db3 | 1372 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1373 | if (ret < 0) |
1374 | goto error; | |
1375 | return put_u64(ts, arg); | |
1376 | } | |
1377 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1378 | { | |
1379 | uint64_t ed; | |
1380 | ||
dd5a0db3 | 1381 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1382 | if (ret < 0) |
1383 | goto error; | |
1384 | return put_u64(ed, arg); | |
1385 | } | |
1386 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1387 | { | |
1388 | uint64_t cs; | |
1389 | ||
dd5a0db3 | 1390 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1391 | if (ret < 0) |
1392 | goto error; | |
1393 | return put_u64(cs, arg); | |
1394 | } | |
1395 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1396 | { | |
1397 | uint64_t ps; | |
1398 | ||
dd5a0db3 | 1399 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1400 | if (ret < 0) |
1401 | goto error; | |
1402 | return put_u64(ps, arg); | |
1403 | } | |
1404 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1405 | { | |
1406 | uint64_t si; | |
1407 | ||
dd5a0db3 | 1408 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1409 | if (ret < 0) |
1410 | goto error; | |
1411 | return put_u64(si, arg); | |
1412 | } | |
2348ca17 JD |
1413 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1414 | { | |
1415 | uint64_t ts; | |
1416 | ||
dd5a0db3 | 1417 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1418 | if (ret < 0) |
1419 | goto error; | |
1420 | return put_u64(ts, arg); | |
1421 | } | |
3b731ab1 JD |
1422 | default: |
1423 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1424 | cmd, arg); | |
ed8d02d6 | 1425 | } |
3b731ab1 JD |
1426 | |
1427 | error: | |
1428 | return -ENOSYS; | |
ed8d02d6 JD |
1429 | } |
1430 | ||
1431 | #ifdef CONFIG_COMPAT | |
1432 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1433 | unsigned int cmd, unsigned long arg) | |
1434 | { | |
3b731ab1 JD |
1435 | struct lib_ring_buffer *buf = filp->private_data; |
1436 | struct channel *chan = buf->backend.chan; | |
1437 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1438 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1439 | int ret; |
1440 | ||
1441 | if (atomic_read(&chan->record_disabled)) | |
1442 | return -EIO; | |
1443 | ||
ed8d02d6 | 1444 | switch (cmd) { |
3b731ab1 JD |
1445 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1446 | { | |
1447 | uint64_t ts; | |
1448 | ||
dd5a0db3 | 1449 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1450 | if (ret < 0) |
1451 | goto error; | |
1452 | return put_u64(ts, arg); | |
1453 | } | |
1454 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1455 | { | |
1456 | uint64_t ts; | |
1457 | ||
dd5a0db3 | 1458 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1459 | if (ret < 0) |
1460 | goto error; | |
1461 | return put_u64(ts, arg); | |
1462 | } | |
1463 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1464 | { | |
1465 | uint64_t ed; | |
1466 | ||
dd5a0db3 | 1467 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1468 | if (ret < 0) |
1469 | goto error; | |
1470 | return put_u64(ed, arg); | |
ed8d02d6 | 1471 | } |
3b731ab1 JD |
1472 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1473 | { | |
1474 | uint64_t cs; | |
1475 | ||
dd5a0db3 | 1476 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1477 | if (ret < 0) |
1478 | goto error; | |
1479 | return put_u64(cs, arg); | |
1480 | } | |
1481 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1482 | { | |
1483 | uint64_t ps; | |
1484 | ||
dd5a0db3 | 1485 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1486 | if (ret < 0) |
1487 | goto error; | |
1488 | return put_u64(ps, arg); | |
1489 | } | |
1490 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1491 | { | |
1492 | uint64_t si; | |
1493 | ||
dd5a0db3 | 1494 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1495 | if (ret < 0) |
1496 | goto error; | |
1497 | return put_u64(si, arg); | |
1498 | } | |
2348ca17 JD |
1499 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1500 | { | |
1501 | uint64_t ts; | |
1502 | ||
dd5a0db3 | 1503 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1504 | if (ret < 0) |
1505 | goto error; | |
1506 | return put_u64(ts, arg); | |
1507 | } | |
3b731ab1 JD |
1508 | default: |
1509 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1510 | cmd, arg); | |
1511 | } | |
1512 | ||
1513 | error: | |
1514 | return -ENOSYS; | |
ed8d02d6 JD |
1515 | } |
1516 | #endif /* CONFIG_COMPAT */ | |
1517 | ||
1518 | static void lttng_stream_override_ring_buffer_fops(void) | |
1519 | { | |
1520 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1521 | lttng_stream_ring_buffer_file_operations.open = | |
1522 | lib_ring_buffer_file_operations.open; | |
1523 | lttng_stream_ring_buffer_file_operations.release = | |
1524 | lib_ring_buffer_file_operations.release; | |
1525 | lttng_stream_ring_buffer_file_operations.poll = | |
1526 | lib_ring_buffer_file_operations.poll; | |
1527 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1528 | lib_ring_buffer_file_operations.splice_read; | |
1529 | lttng_stream_ring_buffer_file_operations.mmap = | |
1530 | lib_ring_buffer_file_operations.mmap; | |
1531 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1532 | lttng_stream_ring_buffer_ioctl; | |
1533 | lttng_stream_ring_buffer_file_operations.llseek = | |
1534 | lib_ring_buffer_file_operations.llseek; | |
1535 | #ifdef CONFIG_COMPAT | |
1536 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1537 | lttng_stream_ring_buffer_compat_ioctl; | |
1538 | #endif | |
1539 | } | |
1540 | ||
80996790 | 1541 | int __init lttng_abi_init(void) |
baf20995 MD |
1542 | { |
1543 | int ret = 0; | |
1544 | ||
6d2a620c | 1545 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1546 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1547 | <tng_fops, NULL); |
1548 | ||
255e52a4 | 1549 | if (!lttng_proc_dentry) { |
baf20995 MD |
1550 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1551 | ret = -ENOMEM; | |
1552 | goto error; | |
1553 | } | |
ed8d02d6 JD |
1554 | lttng_stream_override_ring_buffer_fops(); |
1555 | ||
baf20995 MD |
1556 | error: |
1557 | return ret; | |
1558 | } | |
1559 | ||
e6e65fcd MD |
1560 | /* No __exit annotation because used by init error path too. */ |
1561 | void lttng_abi_exit(void) | |
baf20995 | 1562 | { |
e6a17f26 MD |
1563 | if (lttng_proc_dentry) |
1564 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1565 | } |