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