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 | |
8ee099b6 | 121 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
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 | ||
42cabb80 MD |
154 | static |
155 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
156 | { | |
157 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
158 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
159 | } | |
160 | ||
8070f5c0 MD |
161 | static |
162 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 163 | struct lttng_kernel_context *context_param, |
a90917c3 | 164 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 165 | { |
8070f5c0 MD |
166 | |
167 | if (session->been_active) | |
168 | return -EPERM; | |
169 | ||
6dccd6c1 | 170 | switch (context_param->ctx) { |
12a313a5 | 171 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 172 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
173 | case LTTNG_KERNEL_CONTEXT_PRIO: |
174 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
175 | case LTTNG_KERNEL_CONTEXT_NICE: |
176 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
177 | case LTTNG_KERNEL_CONTEXT_VPID: |
178 | return lttng_add_vpid_to_ctx(ctx); | |
179 | case LTTNG_KERNEL_CONTEXT_TID: | |
180 | return lttng_add_tid_to_ctx(ctx); | |
181 | case LTTNG_KERNEL_CONTEXT_VTID: | |
182 | return lttng_add_vtid_to_ctx(ctx); | |
183 | case LTTNG_KERNEL_CONTEXT_PPID: | |
184 | return lttng_add_ppid_to_ctx(ctx); | |
185 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
186 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 187 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
188 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
189 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
190 | context_param->u.perf_counter.config, | |
191 | context_param->u.perf_counter.name, | |
c24a0d71 | 192 | ctx); |
a2563e83 MD |
193 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
194 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
195 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
196 | return lttng_add_hostname_to_ctx(ctx); | |
8070f5c0 MD |
197 | default: |
198 | return -EINVAL; | |
199 | } | |
200 | } | |
201 | ||
ad1c05e1 MD |
202 | /** |
203 | * lttng_ioctl - lttng syscall through ioctl | |
204 | * | |
c0e31d2e | 205 | * @file: the file |
ad1c05e1 MD |
206 | * @cmd: the command |
207 | * @arg: command arg | |
208 | * | |
209 | * This ioctl implements lttng commands: | |
38d024ae | 210 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 211 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
212 | * LTTNG_KERNEL_TRACER_VERSION |
213 | * Returns the LTTng kernel tracer version | |
214 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
215 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
216 | * LTTNG_KERNEL_WAIT_QUIESCENT |
217 | * Returns after all previously running probes have completed | |
42cabb80 MD |
218 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
219 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
220 | * |
221 | * The returned session will be deleted when its file descriptor is closed. | |
222 | */ | |
223 | static | |
c0e31d2e | 224 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
225 | { |
226 | switch (cmd) { | |
6dccd6c1 | 227 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 228 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 229 | return lttng_abi_create_session(); |
6dccd6c1 JD |
230 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
231 | { | |
232 | struct lttng_kernel_tracer_version v; | |
233 | struct lttng_kernel_old_tracer_version oldv; | |
234 | struct lttng_kernel_old_tracer_version *uversion = | |
235 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
236 | ||
237 | lttng_abi_tracer_version(&v); | |
238 | oldv.major = v.major; | |
239 | oldv.minor = v.minor; | |
240 | oldv.patchlevel = v.patchlevel; | |
241 | ||
242 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
243 | return -EFAULT; | |
244 | return 0; | |
245 | } | |
80c16bcf | 246 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
247 | { |
248 | struct lttng_kernel_tracer_version version; | |
249 | struct lttng_kernel_tracer_version *uversion = | |
250 | (struct lttng_kernel_tracer_version __user *) arg; | |
251 | ||
252 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
253 | |
254 | if (copy_to_user(uversion, &version, sizeof(version))) | |
255 | return -EFAULT; | |
256 | return 0; | |
257 | } | |
258 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
259 | { | |
260 | struct lttng_kernel_tracer_abi_version version; | |
261 | struct lttng_kernel_tracer_abi_version *uversion = | |
262 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
263 | ||
264 | lttng_abi_tracer_abi_version(&version); | |
265 | ||
6dccd6c1 JD |
266 | if (copy_to_user(uversion, &version, sizeof(version))) |
267 | return -EFAULT; | |
268 | return 0; | |
269 | } | |
270 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
271 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
272 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
273 | case LTTNG_KERNEL_SYSCALL_LIST: |
274 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 275 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
276 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
277 | synchronize_trace(); | |
278 | return 0; | |
6dccd6c1 JD |
279 | case LTTNG_KERNEL_OLD_CALIBRATE: |
280 | { | |
281 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
282 | (struct lttng_kernel_old_calibrate __user *) arg; | |
283 | struct lttng_kernel_old_calibrate old_calibrate; | |
284 | struct lttng_kernel_calibrate calibrate; | |
285 | int ret; | |
286 | ||
287 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
288 | return -EFAULT; | |
289 | calibrate.type = old_calibrate.type; | |
290 | ret = lttng_calibrate(&calibrate); | |
291 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
292 | return -EFAULT; | |
293 | return ret; | |
294 | } | |
57105fc2 MD |
295 | case LTTNG_KERNEL_CALIBRATE: |
296 | { | |
3db41b2c MD |
297 | struct lttng_kernel_calibrate __user *ucalibrate = |
298 | (struct lttng_kernel_calibrate __user *) arg; | |
299 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
300 | int ret; |
301 | ||
302 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
303 | return -EFAULT; | |
304 | ret = lttng_calibrate(&calibrate); | |
305 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
306 | return -EFAULT; | |
307 | return ret; | |
308 | } | |
ad1c05e1 MD |
309 | default: |
310 | return -ENOIOCTLCMD; | |
311 | } | |
312 | } | |
313 | ||
ad1c05e1 | 314 | static const struct file_operations lttng_fops = { |
a33c9927 | 315 | .owner = THIS_MODULE, |
ad1c05e1 MD |
316 | .unlocked_ioctl = lttng_ioctl, |
317 | #ifdef CONFIG_COMPAT | |
03037b98 | 318 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 319 | #endif |
11b5a3c2 | 320 | }; |
ad1c05e1 | 321 | |
5dbbdb43 | 322 | static |
c0e31d2e | 323 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 324 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 325 | enum channel_type channel_type) |
baf20995 | 326 | { |
a90917c3 | 327 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 328 | const struct file_operations *fops = NULL; |
5dbbdb43 | 329 | const char *transport_name; |
a90917c3 | 330 | struct lttng_channel *chan; |
c0e31d2e | 331 | struct file *chan_file; |
baf20995 | 332 | int chan_fd; |
ad1c05e1 | 333 | int ret = 0; |
baf20995 | 334 | |
1c25284c | 335 | chan_fd = get_unused_fd(); |
baf20995 MD |
336 | if (chan_fd < 0) { |
337 | ret = chan_fd; | |
338 | goto fd_error; | |
339 | } | |
88dfd899 MD |
340 | switch (channel_type) { |
341 | case PER_CPU_CHANNEL: | |
342 | fops = <tng_channel_fops; | |
343 | break; | |
344 | case METADATA_CHANNEL: | |
345 | fops = <tng_metadata_fops; | |
346 | break; | |
347 | } | |
348 | ||
c0e31d2e | 349 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 350 | fops, |
03037b98 | 351 | NULL, O_RDWR); |
c0e31d2e MD |
352 | if (IS_ERR(chan_file)) { |
353 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
354 | goto file_error; |
355 | } | |
5dbbdb43 MD |
356 | switch (channel_type) { |
357 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
358 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
359 | transport_name = chan_param->overwrite ? | |
96ba7208 | 360 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
361 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
362 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
363 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
364 | } else { | |
365 | return -EINVAL; | |
366 | } | |
5dbbdb43 | 367 | break; |
5dbbdb43 | 368 | case METADATA_CHANNEL: |
6dccd6c1 | 369 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 370 | transport_name = "relay-metadata"; |
6dccd6c1 | 371 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
372 | transport_name = "relay-metadata-mmap"; |
373 | else | |
374 | return -EINVAL; | |
5dbbdb43 MD |
375 | break; |
376 | default: | |
377 | transport_name = "<unknown>"; | |
378 | break; | |
379 | } | |
03037b98 MD |
380 | /* |
381 | * We tolerate no failure path after channel creation. It will stay | |
382 | * invariant for the rest of the session. | |
383 | */ | |
a90917c3 | 384 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
385 | chan_param->subbuf_size, |
386 | chan_param->num_subbuf, | |
387 | chan_param->switch_timer_interval, | |
d83004aa JD |
388 | chan_param->read_timer_interval, |
389 | channel_type); | |
03037b98 | 390 | if (!chan) { |
f3d01b96 | 391 | ret = -EINVAL; |
03037b98 MD |
392 | goto chan_error; |
393 | } | |
11b5a3c2 | 394 | chan->file = chan_file; |
c0e31d2e MD |
395 | chan_file->private_data = chan; |
396 | fd_install(chan_fd, chan_file); | |
b0caa15a | 397 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 398 | |
baf20995 MD |
399 | return chan_fd; |
400 | ||
03037b98 | 401 | chan_error: |
c0e31d2e | 402 | fput(chan_file); |
baf20995 MD |
403 | file_error: |
404 | put_unused_fd(chan_fd); | |
405 | fd_error: | |
baf20995 MD |
406 | return ret; |
407 | } | |
408 | ||
409 | /** | |
ad1c05e1 | 410 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 411 | * |
c0e31d2e | 412 | * @file: the file |
baf20995 MD |
413 | * @cmd: the command |
414 | * @arg: command arg | |
415 | * | |
416 | * This ioctl implements lttng commands: | |
38d024ae | 417 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 418 | * Returns a LTTng channel file descriptor |
e64957da MD |
419 | * LTTNG_KERNEL_ENABLE |
420 | * Enables tracing for a session (weak enable) | |
421 | * LTTNG_KERNEL_DISABLE | |
422 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
423 | * LTTNG_KERNEL_METADATA |
424 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
425 | * |
426 | * The returned channel will be deleted when its file descriptor is closed. | |
427 | */ | |
428 | static | |
c0e31d2e | 429 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 430 | { |
a90917c3 | 431 | struct lttng_session *session = file->private_data; |
c0e31d2e | 432 | |
ad1c05e1 | 433 | switch (cmd) { |
6dccd6c1 JD |
434 | case LTTNG_KERNEL_OLD_CHANNEL: |
435 | { | |
436 | struct lttng_kernel_channel chan_param; | |
437 | struct lttng_kernel_old_channel old_chan_param; | |
438 | ||
439 | if (copy_from_user(&old_chan_param, | |
440 | (struct lttng_kernel_old_channel __user *) arg, | |
441 | sizeof(struct lttng_kernel_old_channel))) | |
442 | return -EFAULT; | |
443 | chan_param.overwrite = old_chan_param.overwrite; | |
444 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
445 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
446 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
447 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
448 | chan_param.output = old_chan_param.output; | |
449 | ||
450 | return lttng_abi_create_channel(file, &chan_param, | |
451 | PER_CPU_CHANNEL); | |
452 | } | |
38d024ae | 453 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
454 | { |
455 | struct lttng_kernel_channel chan_param; | |
456 | ||
457 | if (copy_from_user(&chan_param, | |
38d024ae | 458 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
459 | sizeof(struct lttng_kernel_channel))) |
460 | return -EFAULT; | |
461 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 462 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
463 | } |
464 | case LTTNG_KERNEL_OLD_SESSION_START: | |
465 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 466 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 467 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 468 | return lttng_session_enable(session); |
6dccd6c1 JD |
469 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
470 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 471 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 472 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 473 | return lttng_session_disable(session); |
6dccd6c1 JD |
474 | case LTTNG_KERNEL_OLD_METADATA: |
475 | { | |
476 | struct lttng_kernel_channel chan_param; | |
477 | struct lttng_kernel_old_channel old_chan_param; | |
478 | ||
479 | if (copy_from_user(&old_chan_param, | |
480 | (struct lttng_kernel_old_channel __user *) arg, | |
481 | sizeof(struct lttng_kernel_old_channel))) | |
482 | return -EFAULT; | |
483 | chan_param.overwrite = old_chan_param.overwrite; | |
484 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
485 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
486 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
487 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
488 | chan_param.output = old_chan_param.output; | |
489 | ||
490 | return lttng_abi_create_channel(file, &chan_param, | |
491 | METADATA_CHANNEL); | |
492 | } | |
38d024ae | 493 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
494 | { |
495 | struct lttng_kernel_channel chan_param; | |
496 | ||
497 | if (copy_from_user(&chan_param, | |
498 | (struct lttng_kernel_channel __user *) arg, | |
499 | sizeof(struct lttng_kernel_channel))) | |
500 | return -EFAULT; | |
501 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 502 | METADATA_CHANNEL); |
6dccd6c1 | 503 | } |
ad1c05e1 MD |
504 | default: |
505 | return -ENOIOCTLCMD; | |
506 | } | |
507 | } | |
508 | ||
03037b98 MD |
509 | /* |
510 | * Called when the last file reference is dropped. | |
511 | * | |
512 | * Big fat note: channels and events are invariant for the whole session after | |
513 | * their creation. So this session destruction also destroys all channel and | |
514 | * event structures specific to this session (they are not destroyed when their | |
515 | * individual file is released). | |
516 | */ | |
ad1c05e1 | 517 | static |
03037b98 | 518 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 519 | { |
a90917c3 | 520 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
521 | |
522 | if (session) | |
a90917c3 | 523 | lttng_session_destroy(session); |
11b5a3c2 | 524 | return 0; |
ad1c05e1 | 525 | } |
ad1c05e1 MD |
526 | |
527 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 528 | .owner = THIS_MODULE, |
03037b98 | 529 | .release = lttng_session_release, |
ad1c05e1 MD |
530 | .unlocked_ioctl = lttng_session_ioctl, |
531 | #ifdef CONFIG_COMPAT | |
03037b98 | 532 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 533 | #endif |
11b5a3c2 | 534 | }; |
ad1c05e1 | 535 | |
d83004aa JD |
536 | /** |
537 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
538 | * @filp: the file | |
539 | * @wait: poll table | |
540 | * | |
541 | * Handles the poll operations for the metadata channels. | |
542 | */ | |
ad1c05e1 | 543 | static |
d83004aa JD |
544 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
545 | poll_table *wait) | |
546 | { | |
547 | struct lttng_metadata_stream *stream = filp->private_data; | |
548 | struct lib_ring_buffer *buf = stream->priv; | |
549 | int finalized; | |
550 | unsigned int mask = 0; | |
551 | ||
552 | if (filp->f_mode & FMODE_READ) { | |
553 | poll_wait_set_exclusive(wait); | |
554 | poll_wait(filp, &stream->read_wait, wait); | |
555 | ||
556 | finalized = stream->finalized; | |
557 | ||
558 | /* | |
559 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
560 | * ordering finalized load before offsets loads. | |
561 | */ | |
562 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
563 | ||
564 | if (finalized) | |
565 | mask |= POLLHUP; | |
566 | ||
567 | if (stream->metadata_cache->metadata_written > | |
f613e3e6 | 568 | stream->metadata_out) |
d83004aa JD |
569 | mask |= POLLIN; |
570 | } | |
571 | ||
572 | return mask; | |
573 | } | |
574 | ||
f613e3e6 MD |
575 | static |
576 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
577 | unsigned int cmd, unsigned long arg) | |
578 | { | |
579 | struct lttng_metadata_stream *stream = filp->private_data; | |
580 | ||
581 | stream->metadata_out = stream->metadata_in; | |
582 | } | |
583 | ||
d83004aa JD |
584 | static |
585 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
586 | unsigned int cmd, unsigned long arg) | |
587 | { | |
588 | int ret; | |
589 | struct lttng_metadata_stream *stream = filp->private_data; | |
590 | struct lib_ring_buffer *buf = stream->priv; | |
591 | ||
592 | switch (cmd) { | |
d83004aa JD |
593 | case RING_BUFFER_GET_NEXT_SUBBUF: |
594 | { | |
35097f36 JD |
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 | ret = lttng_metadata_output_channel(stream, chan); | |
600 | if (ret > 0) { | |
601 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
602 | ret = 0; | |
603 | } else if (ret < 0) | |
d83004aa JD |
604 | goto err; |
605 | break; | |
606 | } | |
f613e3e6 MD |
607 | case RING_BUFFER_GET_SUBBUF: |
608 | { | |
609 | /* | |
610 | * Random access is not allowed for metadata channel. | |
611 | */ | |
612 | return -ENOSYS; | |
613 | } | |
35097f36 JD |
614 | case RING_BUFFER_FLUSH: |
615 | { | |
616 | struct lttng_metadata_stream *stream = filp->private_data; | |
617 | struct lib_ring_buffer *buf = stream->priv; | |
618 | struct channel *chan = buf->backend.chan; | |
619 | ||
620 | /* | |
621 | * Before doing the actual ring buffer flush, write up to one | |
622 | * packet of metadata in the ring buffer. | |
623 | */ | |
624 | ret = lttng_metadata_output_channel(stream, chan); | |
625 | if (ret < 0) | |
626 | goto err; | |
627 | break; | |
628 | } | |
d83004aa JD |
629 | default: |
630 | break; | |
631 | } | |
f613e3e6 MD |
632 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
633 | ||
d83004aa | 634 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
635 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
636 | if (ret < 0) | |
637 | goto err; | |
d83004aa | 638 | |
f613e3e6 MD |
639 | switch (cmd) { |
640 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
641 | { | |
642 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
643 | cmd, arg); | |
644 | break; | |
645 | } | |
646 | default: | |
647 | break; | |
648 | } | |
d83004aa JD |
649 | err: |
650 | return ret; | |
651 | } | |
652 | ||
aeb9064d | 653 | #ifdef CONFIG_COMPAT |
d83004aa JD |
654 | static |
655 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
656 | unsigned int cmd, unsigned long arg) | |
657 | { | |
658 | int ret; | |
659 | struct lttng_metadata_stream *stream = filp->private_data; | |
660 | struct lib_ring_buffer *buf = stream->priv; | |
661 | ||
662 | switch (cmd) { | |
d83004aa JD |
663 | case RING_BUFFER_GET_NEXT_SUBBUF: |
664 | { | |
35097f36 JD |
665 | struct lttng_metadata_stream *stream = filp->private_data; |
666 | struct lib_ring_buffer *buf = stream->priv; | |
667 | struct channel *chan = buf->backend.chan; | |
668 | ||
669 | ret = lttng_metadata_output_channel(stream, chan); | |
670 | if (ret > 0) { | |
671 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
672 | ret = 0; | |
673 | } else if (ret < 0) | |
d83004aa JD |
674 | goto err; |
675 | break; | |
676 | } | |
f613e3e6 MD |
677 | case RING_BUFFER_GET_SUBBUF: |
678 | { | |
679 | /* | |
680 | * Random access is not allowed for metadata channel. | |
681 | */ | |
682 | return -ENOSYS; | |
683 | } | |
d83004aa JD |
684 | default: |
685 | break; | |
686 | } | |
f613e3e6 MD |
687 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
688 | ||
d83004aa | 689 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
690 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
691 | if (ret < 0) | |
692 | goto err; | |
d83004aa | 693 | |
f613e3e6 MD |
694 | switch (cmd) { |
695 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
696 | { | |
697 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
698 | cmd, arg); | |
699 | break; | |
700 | } | |
701 | default: | |
702 | break; | |
703 | } | |
d83004aa JD |
704 | err: |
705 | return ret; | |
706 | } | |
aeb9064d | 707 | #endif |
d83004aa | 708 | |
b3b8072b MD |
709 | /* |
710 | * This is not used by anonymous file descriptors. This code is left | |
711 | * there if we ever want to implement an inode with open() operation. | |
712 | */ | |
d83004aa JD |
713 | static |
714 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
715 | { | |
716 | struct lttng_metadata_stream *stream = inode->i_private; | |
717 | struct lib_ring_buffer *buf = stream->priv; | |
718 | ||
719 | file->private_data = buf; | |
b3b8072b MD |
720 | /* |
721 | * Since life-time of metadata cache differs from that of | |
722 | * session, we need to keep our own reference on the transport. | |
723 | */ | |
724 | if (!try_module_get(stream->transport->owner)) { | |
725 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
726 | return -EBUSY; | |
727 | } | |
d83004aa JD |
728 | return lib_ring_buffer_open(inode, file, buf); |
729 | } | |
730 | ||
731 | static | |
732 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
733 | { | |
734 | struct lttng_metadata_stream *stream = file->private_data; | |
735 | struct lib_ring_buffer *buf = stream->priv; | |
736 | ||
737 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 738 | module_put(stream->transport->owner); |
d83004aa JD |
739 | return lib_ring_buffer_release(inode, file, buf); |
740 | } | |
741 | ||
742 | static | |
743 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
744 | struct pipe_inode_info *pipe, size_t len, | |
745 | unsigned int flags) | |
746 | { | |
747 | struct lttng_metadata_stream *stream = in->private_data; | |
748 | struct lib_ring_buffer *buf = stream->priv; | |
749 | ||
750 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
751 | flags, buf); | |
752 | } | |
753 | ||
754 | static | |
755 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
756 | struct vm_area_struct *vma) | |
757 | { | |
758 | struct lttng_metadata_stream *stream = filp->private_data; | |
759 | struct lib_ring_buffer *buf = stream->priv; | |
760 | ||
761 | return lib_ring_buffer_mmap(filp, vma, buf); | |
762 | } | |
763 | ||
764 | static | |
765 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
766 | .owner = THIS_MODULE, | |
767 | .open = lttng_metadata_ring_buffer_open, | |
768 | .release = lttng_metadata_ring_buffer_release, | |
769 | .poll = lttng_metadata_ring_buffer_poll, | |
770 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
771 | .mmap = lttng_metadata_ring_buffer_mmap, | |
772 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
773 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
774 | #ifdef CONFIG_COMPAT | |
775 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
776 | #endif | |
777 | }; | |
778 | ||
779 | static | |
780 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
781 | const struct file_operations *fops) | |
ad1c05e1 | 782 | { |
ad1c05e1 | 783 | int stream_fd, ret; |
11b5a3c2 | 784 | struct file *stream_file; |
ad1c05e1 | 785 | |
1c25284c | 786 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
787 | if (stream_fd < 0) { |
788 | ret = stream_fd; | |
789 | goto fd_error; | |
790 | } | |
d83004aa JD |
791 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
792 | stream_priv, O_RDWR); | |
c0e31d2e MD |
793 | if (IS_ERR(stream_file)) { |
794 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
795 | goto file_error; |
796 | } | |
409453cb MD |
797 | /* |
798 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
799 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
800 | * file descriptor, so we set FMODE_PREAD here. | |
801 | */ | |
d7b6f197 | 802 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 803 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
804 | /* |
805 | * The stream holds a reference to the channel within the generic ring | |
806 | * buffer library, so no need to hold a refcount on the channel and | |
807 | * session files here. | |
808 | */ | |
ad1c05e1 MD |
809 | return stream_fd; |
810 | ||
811 | file_error: | |
812 | put_unused_fd(stream_fd); | |
d83004aa JD |
813 | fd_error: |
814 | return ret; | |
815 | } | |
816 | ||
817 | static | |
818 | int lttng_abi_open_stream(struct file *channel_file) | |
819 | { | |
820 | struct lttng_channel *channel = channel_file->private_data; | |
821 | struct lib_ring_buffer *buf; | |
822 | int ret; | |
823 | void *stream_priv; | |
824 | ||
825 | buf = channel->ops->buffer_read_open(channel->chan); | |
826 | if (!buf) | |
827 | return -ENOENT; | |
828 | ||
829 | stream_priv = buf; | |
830 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 831 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
832 | if (ret < 0) |
833 | goto fd_error; | |
834 | ||
835 | return ret; | |
836 | ||
837 | fd_error: | |
838 | channel->ops->buffer_read_close(buf); | |
839 | return ret; | |
840 | } | |
841 | ||
842 | static | |
843 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
844 | { | |
845 | struct lttng_channel *channel = channel_file->private_data; | |
846 | struct lttng_session *session = channel->session; | |
847 | struct lib_ring_buffer *buf; | |
848 | int ret; | |
849 | struct lttng_metadata_stream *metadata_stream; | |
850 | void *stream_priv; | |
851 | ||
852 | buf = channel->ops->buffer_read_open(channel->chan); | |
853 | if (!buf) | |
854 | return -ENOENT; | |
855 | ||
856 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
857 | GFP_KERNEL); | |
b3b8072b MD |
858 | if (!metadata_stream) { |
859 | ret = -ENOMEM; | |
860 | goto nomem; | |
861 | } | |
d83004aa JD |
862 | metadata_stream->metadata_cache = session->metadata_cache; |
863 | init_waitqueue_head(&metadata_stream->read_wait); | |
864 | metadata_stream->priv = buf; | |
865 | stream_priv = metadata_stream; | |
b3b8072b | 866 | metadata_stream->transport = channel->transport; |
de23d59d | 867 | mutex_init(&metadata_stream->lock); |
b3b8072b MD |
868 | |
869 | /* | |
870 | * Since life-time of metadata cache differs from that of | |
871 | * session, we need to keep our own reference on the transport. | |
872 | */ | |
873 | if (!try_module_get(metadata_stream->transport->owner)) { | |
874 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
875 | ret = -EINVAL; | |
876 | goto notransport; | |
877 | } | |
878 | ||
d83004aa JD |
879 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
880 | <tng_metadata_ring_buffer_file_operations); | |
881 | if (ret < 0) | |
882 | goto fd_error; | |
883 | ||
884 | kref_get(&session->metadata_cache->refcount); | |
885 | list_add(&metadata_stream->list, | |
886 | &session->metadata_cache->metadata_stream); | |
887 | return ret; | |
888 | ||
ad1c05e1 | 889 | fd_error: |
b3b8072b MD |
890 | module_put(metadata_stream->transport->owner); |
891 | notransport: | |
892 | kfree(metadata_stream); | |
893 | nomem: | |
11b5a3c2 | 894 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
895 | return ret; |
896 | } | |
897 | ||
653fe716 | 898 | static |
c0e31d2e | 899 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 900 | struct lttng_kernel_event *event_param) |
653fe716 | 901 | { |
a90917c3 MD |
902 | struct lttng_channel *channel = channel_file->private_data; |
903 | struct lttng_event *event; | |
653fe716 | 904 | int event_fd, ret; |
11b5a3c2 | 905 | struct file *event_file; |
653fe716 | 906 | |
6dccd6c1 JD |
907 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
908 | switch (event_param->instrumentation) { | |
7371f44c | 909 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 910 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 911 | break; |
ab2277d6 | 912 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 913 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 914 | break; |
ab2277d6 | 915 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 916 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
917 | break; |
918 | default: | |
919 | break; | |
920 | } | |
6dccd6c1 | 921 | switch (event_param->instrumentation) { |
1ec65de1 MD |
922 | default: |
923 | event_fd = get_unused_fd(); | |
924 | if (event_fd < 0) { | |
925 | ret = event_fd; | |
926 | goto fd_error; | |
927 | } | |
928 | event_file = anon_inode_getfile("[lttng_event]", | |
929 | <tng_event_fops, | |
930 | NULL, O_RDWR); | |
931 | if (IS_ERR(event_file)) { | |
932 | ret = PTR_ERR(event_file); | |
933 | goto file_error; | |
934 | } | |
935 | /* | |
936 | * We tolerate no failure path after event creation. It | |
937 | * will stay invariant for the rest of the session. | |
938 | */ | |
6dccd6c1 | 939 | event = lttng_event_create(channel, event_param, NULL, NULL); |
abc0446a MD |
940 | WARN_ON_ONCE(!event); |
941 | if (IS_ERR(event)) { | |
942 | ret = PTR_ERR(event); | |
1ec65de1 MD |
943 | goto event_error; |
944 | } | |
945 | event_file->private_data = event; | |
946 | fd_install(event_fd, event_file); | |
947 | /* The event holds a reference on the channel */ | |
948 | atomic_long_inc(&channel_file->f_count); | |
949 | break; | |
43880ee8 | 950 | case LTTNG_KERNEL_SYSCALL: |
1ec65de1 MD |
951 | ret = lttng_syscalls_register(channel, NULL); |
952 | if (ret) | |
953 | goto fd_error; | |
954 | event_fd = 0; | |
4ee2453d MD |
955 | if (event_param->u.syscall.enable) { |
956 | ret = lttng_syscall_filter_enable(channel, | |
80f87dd2 MD |
957 | event_param->name[0] == '\0' ? |
958 | NULL : event_param->name); | |
959 | if (ret) | |
960 | goto fd_error; | |
4ee2453d | 961 | |
80f87dd2 | 962 | } else { |
4ee2453d | 963 | ret = lttng_syscall_filter_disable(channel, |
80f87dd2 MD |
964 | event_param->name[0] == '\0' ? |
965 | NULL : event_param->name); | |
966 | if (ret) | |
967 | goto fd_error; | |
968 | } | |
1ec65de1 | 969 | break; |
03037b98 | 970 | } |
653fe716 MD |
971 | return event_fd; |
972 | ||
03037b98 | 973 | event_error: |
c0e31d2e | 974 | fput(event_file); |
653fe716 MD |
975 | file_error: |
976 | put_unused_fd(event_fd); | |
977 | fd_error: | |
653fe716 MD |
978 | return ret; |
979 | } | |
ad1c05e1 MD |
980 | |
981 | /** | |
982 | * lttng_channel_ioctl - lttng syscall through ioctl | |
983 | * | |
c0e31d2e | 984 | * @file: the file |
ad1c05e1 MD |
985 | * @cmd: the command |
986 | * @arg: command arg | |
987 | * | |
988 | * This ioctl implements lttng commands: | |
38d024ae | 989 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
990 | * Returns an event stream file descriptor or failure. |
991 | * (typically, one event stream records events from one CPU) | |
38d024ae | 992 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 993 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
994 | * LTTNG_KERNEL_CONTEXT |
995 | * Prepend a context field to each event in the channel | |
e64957da MD |
996 | * LTTNG_KERNEL_ENABLE |
997 | * Enable recording for events in this channel (weak enable) | |
998 | * LTTNG_KERNEL_DISABLE | |
999 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1000 | * |
baf20995 MD |
1001 | * Channel and event file descriptors also hold a reference on the session. |
1002 | */ | |
ad1c05e1 | 1003 | static |
c0e31d2e | 1004 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1005 | { |
a90917c3 | 1006 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1007 | |
baf20995 | 1008 | switch (cmd) { |
6dccd6c1 | 1009 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1010 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1011 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1012 | case LTTNG_KERNEL_OLD_EVENT: |
1013 | { | |
1014 | struct lttng_kernel_event *uevent_param; | |
1015 | struct lttng_kernel_old_event *old_uevent_param; | |
1016 | int ret; | |
1017 | ||
1018 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1019 | GFP_KERNEL); | |
1020 | if (!uevent_param) { | |
1021 | ret = -ENOMEM; | |
1022 | goto old_event_end; | |
1023 | } | |
1024 | old_uevent_param = kmalloc( | |
1025 | sizeof(struct lttng_kernel_old_event), | |
1026 | GFP_KERNEL); | |
1027 | if (!old_uevent_param) { | |
1028 | ret = -ENOMEM; | |
1029 | goto old_event_error_free_param; | |
1030 | } | |
1031 | if (copy_from_user(old_uevent_param, | |
1032 | (struct lttng_kernel_old_event __user *) arg, | |
1033 | sizeof(struct lttng_kernel_old_event))) { | |
1034 | ret = -EFAULT; | |
1035 | goto old_event_error_free_old_param; | |
1036 | } | |
1037 | ||
1038 | memcpy(uevent_param->name, old_uevent_param->name, | |
1039 | sizeof(uevent_param->name)); | |
1040 | uevent_param->instrumentation = | |
1041 | old_uevent_param->instrumentation; | |
1042 | ||
1043 | switch (old_uevent_param->instrumentation) { | |
1044 | case LTTNG_KERNEL_KPROBE: | |
1045 | uevent_param->u.kprobe.addr = | |
1046 | old_uevent_param->u.kprobe.addr; | |
1047 | uevent_param->u.kprobe.offset = | |
1048 | old_uevent_param->u.kprobe.offset; | |
1049 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1050 | old_uevent_param->u.kprobe.symbol_name, | |
1051 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1052 | break; | |
1053 | case LTTNG_KERNEL_KRETPROBE: | |
1054 | uevent_param->u.kretprobe.addr = | |
1055 | old_uevent_param->u.kretprobe.addr; | |
1056 | uevent_param->u.kretprobe.offset = | |
1057 | old_uevent_param->u.kretprobe.offset; | |
1058 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1059 | old_uevent_param->u.kretprobe.symbol_name, | |
1060 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1061 | break; | |
1062 | case LTTNG_KERNEL_FUNCTION: | |
1063 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1064 | old_uevent_param->u.ftrace.symbol_name, | |
1065 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1066 | break; | |
1067 | default: | |
1068 | break; | |
1069 | } | |
1070 | ret = lttng_abi_create_event(file, uevent_param); | |
1071 | ||
1072 | old_event_error_free_old_param: | |
1073 | kfree(old_uevent_param); | |
1074 | old_event_error_free_param: | |
1075 | kfree(uevent_param); | |
1076 | old_event_end: | |
1077 | return ret; | |
1078 | } | |
38d024ae | 1079 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1080 | { |
1081 | struct lttng_kernel_event uevent_param; | |
1082 | ||
1083 | if (copy_from_user(&uevent_param, | |
1084 | (struct lttng_kernel_event __user *) arg, | |
1085 | sizeof(uevent_param))) | |
1086 | return -EFAULT; | |
1087 | return lttng_abi_create_event(file, &uevent_param); | |
1088 | } | |
1089 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1090 | { | |
1091 | struct lttng_kernel_context *ucontext_param; | |
1092 | struct lttng_kernel_old_context *old_ucontext_param; | |
1093 | int ret; | |
1094 | ||
1095 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1096 | GFP_KERNEL); | |
1097 | if (!ucontext_param) { | |
1098 | ret = -ENOMEM; | |
1099 | goto old_ctx_end; | |
1100 | } | |
1101 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1102 | GFP_KERNEL); | |
1103 | if (!old_ucontext_param) { | |
1104 | ret = -ENOMEM; | |
1105 | goto old_ctx_error_free_param; | |
1106 | } | |
1107 | ||
1108 | if (copy_from_user(old_ucontext_param, | |
1109 | (struct lttng_kernel_old_context __user *) arg, | |
1110 | sizeof(struct lttng_kernel_old_context))) { | |
1111 | ret = -EFAULT; | |
1112 | goto old_ctx_error_free_old_param; | |
1113 | } | |
1114 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1115 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1116 | sizeof(ucontext_param->padding)); | |
1117 | /* only type that uses the union */ | |
1118 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1119 | ucontext_param->u.perf_counter.type = | |
1120 | old_ucontext_param->u.perf_counter.type; | |
1121 | ucontext_param->u.perf_counter.config = | |
1122 | old_ucontext_param->u.perf_counter.config; | |
1123 | memcpy(ucontext_param->u.perf_counter.name, | |
1124 | old_ucontext_param->u.perf_counter.name, | |
1125 | sizeof(ucontext_param->u.perf_counter.name)); | |
1126 | } | |
1127 | ||
1128 | ret = lttng_abi_add_context(file, | |
1129 | ucontext_param, | |
1130 | &channel->ctx, channel->session); | |
1131 | ||
1132 | old_ctx_error_free_old_param: | |
1133 | kfree(old_ucontext_param); | |
1134 | old_ctx_error_free_param: | |
1135 | kfree(ucontext_param); | |
1136 | old_ctx_end: | |
1137 | return ret; | |
1138 | } | |
8070f5c0 | 1139 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1140 | { |
1141 | struct lttng_kernel_context ucontext_param; | |
1142 | ||
1143 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1144 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1145 | sizeof(ucontext_param))) |
1146 | return -EFAULT; | |
1147 | return lttng_abi_add_context(file, | |
1148 | &ucontext_param, | |
8070f5c0 | 1149 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1150 | } |
1151 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1152 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1153 | return lttng_channel_enable(channel); |
6dccd6c1 | 1154 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1155 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1156 | return lttng_channel_disable(channel); |
12e579db MD |
1157 | case LTTNG_KERNEL_SYSCALL_MASK: |
1158 | return lttng_channel_syscall_mask(channel, | |
1159 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1160 | default: |
1161 | return -ENOIOCTLCMD; | |
1162 | } | |
6dccd6c1 | 1163 | |
baf20995 MD |
1164 | } |
1165 | ||
5dbbdb43 MD |
1166 | /** |
1167 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1168 | * | |
1169 | * @file: the file | |
1170 | * @cmd: the command | |
1171 | * @arg: command arg | |
1172 | * | |
1173 | * This ioctl implements lttng commands: | |
38d024ae | 1174 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1175 | * Returns an event stream file descriptor or failure. |
1176 | * | |
1177 | * Channel and event file descriptors also hold a reference on the session. | |
1178 | */ | |
1179 | static | |
1180 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1181 | { | |
1182 | switch (cmd) { | |
6dccd6c1 | 1183 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1184 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1185 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1186 | default: |
1187 | return -ENOIOCTLCMD; | |
1188 | } | |
1189 | } | |
1190 | ||
653fe716 MD |
1191 | /** |
1192 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1193 | * | |
c0e31d2e | 1194 | * @file: the file |
653fe716 MD |
1195 | * @wait: poll table |
1196 | */ | |
c0e31d2e | 1197 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1198 | { |
a90917c3 | 1199 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1200 | unsigned int mask = 0; |
1201 | ||
c0e31d2e | 1202 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1203 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1204 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1205 | wait); | |
653fe716 | 1206 | |
254ec7bc MD |
1207 | if (channel->ops->is_disabled(channel->chan)) |
1208 | return POLLERR; | |
24cedcfe | 1209 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1210 | return POLLHUP; |
f71ecafa | 1211 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1212 | return POLLIN | POLLRDNORM; |
f71ecafa | 1213 | return 0; |
653fe716 MD |
1214 | } |
1215 | return mask; | |
1216 | ||
1217 | } | |
1218 | ||
0a84a57f MD |
1219 | static |
1220 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1221 | { | |
a90917c3 | 1222 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1223 | |
1224 | if (channel) | |
1225 | fput(channel->session->file); | |
0a84a57f MD |
1226 | return 0; |
1227 | } | |
1228 | ||
d83004aa JD |
1229 | static |
1230 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1231 | { | |
1232 | struct lttng_channel *channel = file->private_data; | |
1233 | ||
1234 | if (channel) { | |
1235 | lttng_metadata_channel_destroy(channel); | |
1236 | fput(channel->session->file); | |
1237 | } | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
ad1c05e1 | 1242 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1243 | .owner = THIS_MODULE, |
03037b98 | 1244 | .release = lttng_channel_release, |
653fe716 | 1245 | .poll = lttng_channel_poll, |
ad1c05e1 | 1246 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1247 | #ifdef CONFIG_COMPAT |
03037b98 | 1248 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1249 | #endif |
11b5a3c2 | 1250 | }; |
baf20995 | 1251 | |
5dbbdb43 | 1252 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1253 | .owner = THIS_MODULE, |
d83004aa | 1254 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1255 | .unlocked_ioctl = lttng_metadata_ioctl, |
1256 | #ifdef CONFIG_COMPAT | |
1257 | .compat_ioctl = lttng_metadata_ioctl, | |
1258 | #endif | |
1259 | }; | |
1260 | ||
8070f5c0 MD |
1261 | /** |
1262 | * lttng_event_ioctl - lttng syscall through ioctl | |
1263 | * | |
1264 | * @file: the file | |
1265 | * @cmd: the command | |
1266 | * @arg: command arg | |
1267 | * | |
1268 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1269 | * LTTNG_KERNEL_CONTEXT |
1270 | * Prepend a context field to each record of this event | |
e64957da MD |
1271 | * LTTNG_KERNEL_ENABLE |
1272 | * Enable recording for this event (weak enable) | |
1273 | * LTTNG_KERNEL_DISABLE | |
1274 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1275 | */ |
1276 | static | |
1277 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1278 | { | |
a90917c3 | 1279 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
1280 | |
1281 | switch (cmd) { | |
6dccd6c1 JD |
1282 | case LTTNG_KERNEL_OLD_CONTEXT: |
1283 | { | |
1284 | struct lttng_kernel_context *ucontext_param; | |
1285 | struct lttng_kernel_old_context *old_ucontext_param; | |
1286 | int ret; | |
1287 | ||
1288 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1289 | GFP_KERNEL); | |
1290 | if (!ucontext_param) { | |
1291 | ret = -ENOMEM; | |
1292 | goto old_ctx_end; | |
1293 | } | |
1294 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1295 | GFP_KERNEL); | |
1296 | if (!old_ucontext_param) { | |
1297 | ret = -ENOMEM; | |
1298 | goto old_ctx_error_free_param; | |
1299 | } | |
1300 | ||
1301 | if (copy_from_user(old_ucontext_param, | |
1302 | (struct lttng_kernel_old_context __user *) arg, | |
1303 | sizeof(struct lttng_kernel_old_context))) { | |
1304 | ret = -EFAULT; | |
1305 | goto old_ctx_error_free_old_param; | |
1306 | } | |
1307 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1308 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1309 | sizeof(ucontext_param->padding)); | |
1310 | /* only type that uses the union */ | |
1311 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1312 | ucontext_param->u.perf_counter.type = | |
1313 | old_ucontext_param->u.perf_counter.type; | |
1314 | ucontext_param->u.perf_counter.config = | |
1315 | old_ucontext_param->u.perf_counter.config; | |
1316 | memcpy(ucontext_param->u.perf_counter.name, | |
1317 | old_ucontext_param->u.perf_counter.name, | |
1318 | sizeof(ucontext_param->u.perf_counter.name)); | |
1319 | } | |
1320 | ||
1321 | ret = lttng_abi_add_context(file, | |
1322 | ucontext_param, | |
1323 | &event->ctx, event->chan->session); | |
1324 | ||
1325 | old_ctx_error_free_old_param: | |
1326 | kfree(old_ucontext_param); | |
1327 | old_ctx_error_free_param: | |
1328 | kfree(ucontext_param); | |
1329 | old_ctx_end: | |
1330 | return ret; | |
1331 | } | |
8070f5c0 | 1332 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1333 | { |
1334 | struct lttng_kernel_context ucontext_param; | |
1335 | ||
1336 | if (copy_from_user(&ucontext_param, | |
1337 | (struct lttng_kernel_context __user *) arg, | |
1338 | sizeof(ucontext_param))) | |
1339 | return -EFAULT; | |
8070f5c0 | 1340 | return lttng_abi_add_context(file, |
6dccd6c1 | 1341 | &ucontext_param, |
8070f5c0 | 1342 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
1343 | } |
1344 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1345 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1346 | return lttng_event_enable(event); |
6dccd6c1 | 1347 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1348 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1349 | return lttng_event_disable(event); |
8070f5c0 MD |
1350 | default: |
1351 | return -ENOIOCTLCMD; | |
1352 | } | |
1353 | } | |
1354 | ||
0a84a57f MD |
1355 | static |
1356 | int lttng_event_release(struct inode *inode, struct file *file) | |
1357 | { | |
a90917c3 | 1358 | struct lttng_event *event = file->private_data; |
c269fff4 | 1359 | |
aa7c23a9 | 1360 | if (event) |
c269fff4 | 1361 | fput(event->chan->file); |
0a84a57f MD |
1362 | return 0; |
1363 | } | |
1364 | ||
3b923e5b | 1365 | /* TODO: filter control ioctl */ |
0a84a57f | 1366 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1367 | .owner = THIS_MODULE, |
0a84a57f | 1368 | .release = lttng_event_release, |
8070f5c0 MD |
1369 | .unlocked_ioctl = lttng_event_ioctl, |
1370 | #ifdef CONFIG_COMPAT | |
1371 | .compat_ioctl = lttng_event_ioctl, | |
1372 | #endif | |
11b5a3c2 | 1373 | }; |
0a84a57f | 1374 | |
3b731ab1 JD |
1375 | static int put_u64(uint64_t val, unsigned long arg) |
1376 | { | |
1377 | return put_user(val, (uint64_t __user *) arg); | |
1378 | } | |
1379 | ||
ed8d02d6 JD |
1380 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1381 | unsigned int cmd, unsigned long arg) | |
1382 | { | |
3b731ab1 JD |
1383 | struct lib_ring_buffer *buf = filp->private_data; |
1384 | struct channel *chan = buf->backend.chan; | |
1385 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1386 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1387 | int ret; |
1388 | ||
1389 | if (atomic_read(&chan->record_disabled)) | |
1390 | return -EIO; | |
1391 | ||
ed8d02d6 | 1392 | switch (cmd) { |
3b731ab1 JD |
1393 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1394 | { | |
1395 | uint64_t ts; | |
1396 | ||
dd5a0db3 | 1397 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1398 | if (ret < 0) |
1399 | goto error; | |
1400 | return put_u64(ts, arg); | |
1401 | } | |
1402 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1403 | { | |
1404 | uint64_t ts; | |
1405 | ||
dd5a0db3 | 1406 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1407 | if (ret < 0) |
1408 | goto error; | |
1409 | return put_u64(ts, arg); | |
1410 | } | |
1411 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1412 | { | |
1413 | uint64_t ed; | |
1414 | ||
dd5a0db3 | 1415 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1416 | if (ret < 0) |
1417 | goto error; | |
1418 | return put_u64(ed, arg); | |
1419 | } | |
1420 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1421 | { | |
1422 | uint64_t cs; | |
1423 | ||
dd5a0db3 | 1424 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1425 | if (ret < 0) |
1426 | goto error; | |
1427 | return put_u64(cs, arg); | |
1428 | } | |
1429 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1430 | { | |
1431 | uint64_t ps; | |
1432 | ||
dd5a0db3 | 1433 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1434 | if (ret < 0) |
1435 | goto error; | |
1436 | return put_u64(ps, arg); | |
1437 | } | |
1438 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1439 | { | |
1440 | uint64_t si; | |
1441 | ||
dd5a0db3 | 1442 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1443 | if (ret < 0) |
1444 | goto error; | |
1445 | return put_u64(si, arg); | |
1446 | } | |
2348ca17 JD |
1447 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1448 | { | |
1449 | uint64_t ts; | |
1450 | ||
dd5a0db3 | 1451 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1452 | if (ret < 0) |
1453 | goto error; | |
1454 | return put_u64(ts, arg); | |
1455 | } | |
3b731ab1 JD |
1456 | default: |
1457 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1458 | cmd, arg); | |
ed8d02d6 | 1459 | } |
3b731ab1 JD |
1460 | |
1461 | error: | |
1462 | return -ENOSYS; | |
ed8d02d6 JD |
1463 | } |
1464 | ||
1465 | #ifdef CONFIG_COMPAT | |
1466 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1467 | unsigned int cmd, unsigned long arg) | |
1468 | { | |
3b731ab1 JD |
1469 | struct lib_ring_buffer *buf = filp->private_data; |
1470 | struct channel *chan = buf->backend.chan; | |
1471 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1472 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1473 | int ret; |
1474 | ||
1475 | if (atomic_read(&chan->record_disabled)) | |
1476 | return -EIO; | |
1477 | ||
ed8d02d6 | 1478 | switch (cmd) { |
3b731ab1 JD |
1479 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1480 | { | |
1481 | uint64_t ts; | |
1482 | ||
dd5a0db3 | 1483 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1484 | if (ret < 0) |
1485 | goto error; | |
1486 | return put_u64(ts, arg); | |
1487 | } | |
1488 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1489 | { | |
1490 | uint64_t ts; | |
1491 | ||
dd5a0db3 | 1492 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1493 | if (ret < 0) |
1494 | goto error; | |
1495 | return put_u64(ts, arg); | |
1496 | } | |
1497 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1498 | { | |
1499 | uint64_t ed; | |
1500 | ||
dd5a0db3 | 1501 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1502 | if (ret < 0) |
1503 | goto error; | |
1504 | return put_u64(ed, arg); | |
ed8d02d6 | 1505 | } |
3b731ab1 JD |
1506 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1507 | { | |
1508 | uint64_t cs; | |
1509 | ||
dd5a0db3 | 1510 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1511 | if (ret < 0) |
1512 | goto error; | |
1513 | return put_u64(cs, arg); | |
1514 | } | |
1515 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1516 | { | |
1517 | uint64_t ps; | |
1518 | ||
dd5a0db3 | 1519 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1520 | if (ret < 0) |
1521 | goto error; | |
1522 | return put_u64(ps, arg); | |
1523 | } | |
1524 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1525 | { | |
1526 | uint64_t si; | |
1527 | ||
dd5a0db3 | 1528 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1529 | if (ret < 0) |
1530 | goto error; | |
1531 | return put_u64(si, arg); | |
1532 | } | |
2348ca17 JD |
1533 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1534 | { | |
1535 | uint64_t ts; | |
1536 | ||
dd5a0db3 | 1537 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1538 | if (ret < 0) |
1539 | goto error; | |
1540 | return put_u64(ts, arg); | |
1541 | } | |
3b731ab1 JD |
1542 | default: |
1543 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1544 | cmd, arg); | |
1545 | } | |
1546 | ||
1547 | error: | |
1548 | return -ENOSYS; | |
ed8d02d6 JD |
1549 | } |
1550 | #endif /* CONFIG_COMPAT */ | |
1551 | ||
1552 | static void lttng_stream_override_ring_buffer_fops(void) | |
1553 | { | |
1554 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1555 | lttng_stream_ring_buffer_file_operations.open = | |
1556 | lib_ring_buffer_file_operations.open; | |
1557 | lttng_stream_ring_buffer_file_operations.release = | |
1558 | lib_ring_buffer_file_operations.release; | |
1559 | lttng_stream_ring_buffer_file_operations.poll = | |
1560 | lib_ring_buffer_file_operations.poll; | |
1561 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1562 | lib_ring_buffer_file_operations.splice_read; | |
1563 | lttng_stream_ring_buffer_file_operations.mmap = | |
1564 | lib_ring_buffer_file_operations.mmap; | |
1565 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1566 | lttng_stream_ring_buffer_ioctl; | |
1567 | lttng_stream_ring_buffer_file_operations.llseek = | |
1568 | lib_ring_buffer_file_operations.llseek; | |
1569 | #ifdef CONFIG_COMPAT | |
1570 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1571 | lttng_stream_ring_buffer_compat_ioctl; | |
1572 | #endif | |
1573 | } | |
1574 | ||
80996790 | 1575 | int __init lttng_abi_init(void) |
baf20995 MD |
1576 | { |
1577 | int ret = 0; | |
1578 | ||
6d2a620c | 1579 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1580 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1581 | <tng_fops, NULL); |
1582 | ||
255e52a4 | 1583 | if (!lttng_proc_dentry) { |
baf20995 MD |
1584 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1585 | ret = -ENOMEM; | |
1586 | goto error; | |
1587 | } | |
ed8d02d6 JD |
1588 | lttng_stream_override_ring_buffer_fops(); |
1589 | ||
baf20995 MD |
1590 | error: |
1591 | return ret; | |
1592 | } | |
1593 | ||
e6e65fcd MD |
1594 | /* No __exit annotation because used by init error path too. */ |
1595 | void lttng_abi_exit(void) | |
baf20995 | 1596 | { |
e6a17f26 MD |
1597 | if (lttng_proc_dentry) |
1598 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1599 | } |