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 | ||
2d2464bd MD |
146 | static |
147 | int lttng_abi_syscall_list(void) | |
148 | { | |
149 | struct file *syscall_list_file; | |
150 | int file_fd, ret; | |
151 | ||
152 | file_fd = get_unused_fd(); | |
153 | if (file_fd < 0) { | |
154 | ret = file_fd; | |
155 | goto fd_error; | |
156 | } | |
157 | ||
158 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
159 | <tng_syscall_list_fops, | |
160 | NULL, O_RDWR); | |
161 | if (IS_ERR(syscall_list_file)) { | |
162 | ret = PTR_ERR(syscall_list_file); | |
163 | goto file_error; | |
164 | } | |
165 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
166 | if (ret < 0) | |
167 | goto open_error; | |
168 | fd_install(file_fd, syscall_list_file); | |
169 | if (file_fd < 0) { | |
170 | ret = file_fd; | |
171 | goto fd_error; | |
172 | } | |
173 | return file_fd; | |
174 | ||
175 | open_error: | |
176 | fput(syscall_list_file); | |
177 | file_error: | |
178 | put_unused_fd(file_fd); | |
179 | fd_error: | |
180 | return ret; | |
181 | } | |
182 | ||
80c16bcf | 183 | static |
6dccd6c1 | 184 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 185 | { |
6dccd6c1 JD |
186 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
187 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
188 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
189 | } |
190 | ||
8070f5c0 MD |
191 | static |
192 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 193 | struct lttng_kernel_context *context_param, |
a90917c3 | 194 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 195 | { |
8070f5c0 MD |
196 | |
197 | if (session->been_active) | |
198 | return -EPERM; | |
199 | ||
6dccd6c1 | 200 | switch (context_param->ctx) { |
12a313a5 | 201 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 202 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
203 | case LTTNG_KERNEL_CONTEXT_PRIO: |
204 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
205 | case LTTNG_KERNEL_CONTEXT_NICE: |
206 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
207 | case LTTNG_KERNEL_CONTEXT_VPID: |
208 | return lttng_add_vpid_to_ctx(ctx); | |
209 | case LTTNG_KERNEL_CONTEXT_TID: | |
210 | return lttng_add_tid_to_ctx(ctx); | |
211 | case LTTNG_KERNEL_CONTEXT_VTID: | |
212 | return lttng_add_vtid_to_ctx(ctx); | |
213 | case LTTNG_KERNEL_CONTEXT_PPID: | |
214 | return lttng_add_ppid_to_ctx(ctx); | |
215 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
216 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 217 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
218 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
219 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
220 | context_param->u.perf_counter.config, | |
221 | context_param->u.perf_counter.name, | |
c24a0d71 | 222 | ctx); |
a2563e83 MD |
223 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
224 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
225 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
226 | return lttng_add_hostname_to_ctx(ctx); | |
8070f5c0 MD |
227 | default: |
228 | return -EINVAL; | |
229 | } | |
230 | } | |
231 | ||
ad1c05e1 MD |
232 | /** |
233 | * lttng_ioctl - lttng syscall through ioctl | |
234 | * | |
c0e31d2e | 235 | * @file: the file |
ad1c05e1 MD |
236 | * @cmd: the command |
237 | * @arg: command arg | |
238 | * | |
239 | * This ioctl implements lttng commands: | |
38d024ae | 240 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 241 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
242 | * LTTNG_KERNEL_TRACER_VERSION |
243 | * Returns the LTTng kernel tracer version | |
244 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
245 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
246 | * LTTNG_KERNEL_WAIT_QUIESCENT |
247 | * Returns after all previously running probes have completed | |
ad1c05e1 MD |
248 | * |
249 | * The returned session will be deleted when its file descriptor is closed. | |
250 | */ | |
251 | static | |
c0e31d2e | 252 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
253 | { |
254 | switch (cmd) { | |
6dccd6c1 | 255 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 256 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 257 | return lttng_abi_create_session(); |
6dccd6c1 JD |
258 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
259 | { | |
260 | struct lttng_kernel_tracer_version v; | |
261 | struct lttng_kernel_old_tracer_version oldv; | |
262 | struct lttng_kernel_old_tracer_version *uversion = | |
263 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
264 | ||
265 | lttng_abi_tracer_version(&v); | |
266 | oldv.major = v.major; | |
267 | oldv.minor = v.minor; | |
268 | oldv.patchlevel = v.patchlevel; | |
269 | ||
270 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
271 | return -EFAULT; | |
272 | return 0; | |
273 | } | |
80c16bcf | 274 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
275 | { |
276 | struct lttng_kernel_tracer_version version; | |
277 | struct lttng_kernel_tracer_version *uversion = | |
278 | (struct lttng_kernel_tracer_version __user *) arg; | |
279 | ||
280 | lttng_abi_tracer_version(&version); | |
281 | ||
282 | if (copy_to_user(uversion, &version, sizeof(version))) | |
283 | return -EFAULT; | |
284 | return 0; | |
285 | } | |
286 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
287 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
288 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
289 | case LTTNG_KERNEL_SYSCALL_LIST: |
290 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 291 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
292 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
293 | synchronize_trace(); | |
294 | return 0; | |
6dccd6c1 JD |
295 | case LTTNG_KERNEL_OLD_CALIBRATE: |
296 | { | |
297 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
298 | (struct lttng_kernel_old_calibrate __user *) arg; | |
299 | struct lttng_kernel_old_calibrate old_calibrate; | |
300 | struct lttng_kernel_calibrate calibrate; | |
301 | int ret; | |
302 | ||
303 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
304 | return -EFAULT; | |
305 | calibrate.type = old_calibrate.type; | |
306 | ret = lttng_calibrate(&calibrate); | |
307 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
308 | return -EFAULT; | |
309 | return ret; | |
310 | } | |
57105fc2 MD |
311 | case LTTNG_KERNEL_CALIBRATE: |
312 | { | |
3db41b2c MD |
313 | struct lttng_kernel_calibrate __user *ucalibrate = |
314 | (struct lttng_kernel_calibrate __user *) arg; | |
315 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
316 | int ret; |
317 | ||
318 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
319 | return -EFAULT; | |
320 | ret = lttng_calibrate(&calibrate); | |
321 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
322 | return -EFAULT; | |
323 | return ret; | |
324 | } | |
ad1c05e1 MD |
325 | default: |
326 | return -ENOIOCTLCMD; | |
327 | } | |
328 | } | |
329 | ||
ad1c05e1 | 330 | static const struct file_operations lttng_fops = { |
a33c9927 | 331 | .owner = THIS_MODULE, |
ad1c05e1 MD |
332 | .unlocked_ioctl = lttng_ioctl, |
333 | #ifdef CONFIG_COMPAT | |
03037b98 | 334 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 335 | #endif |
11b5a3c2 | 336 | }; |
ad1c05e1 | 337 | |
5dbbdb43 | 338 | static |
c0e31d2e | 339 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 340 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 341 | enum channel_type channel_type) |
baf20995 | 342 | { |
a90917c3 | 343 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 344 | const struct file_operations *fops = NULL; |
5dbbdb43 | 345 | const char *transport_name; |
a90917c3 | 346 | struct lttng_channel *chan; |
c0e31d2e | 347 | struct file *chan_file; |
baf20995 | 348 | int chan_fd; |
ad1c05e1 | 349 | int ret = 0; |
baf20995 | 350 | |
1c25284c | 351 | chan_fd = get_unused_fd(); |
baf20995 MD |
352 | if (chan_fd < 0) { |
353 | ret = chan_fd; | |
354 | goto fd_error; | |
355 | } | |
88dfd899 MD |
356 | switch (channel_type) { |
357 | case PER_CPU_CHANNEL: | |
358 | fops = <tng_channel_fops; | |
359 | break; | |
360 | case METADATA_CHANNEL: | |
361 | fops = <tng_metadata_fops; | |
362 | break; | |
363 | } | |
364 | ||
c0e31d2e | 365 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 366 | fops, |
03037b98 | 367 | NULL, O_RDWR); |
c0e31d2e MD |
368 | if (IS_ERR(chan_file)) { |
369 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
370 | goto file_error; |
371 | } | |
5dbbdb43 MD |
372 | switch (channel_type) { |
373 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
374 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
375 | transport_name = chan_param->overwrite ? | |
96ba7208 | 376 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
377 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
378 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
379 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
380 | } else { | |
381 | return -EINVAL; | |
382 | } | |
5dbbdb43 | 383 | break; |
5dbbdb43 | 384 | case METADATA_CHANNEL: |
6dccd6c1 | 385 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 386 | transport_name = "relay-metadata"; |
6dccd6c1 | 387 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
388 | transport_name = "relay-metadata-mmap"; |
389 | else | |
390 | return -EINVAL; | |
5dbbdb43 MD |
391 | break; |
392 | default: | |
393 | transport_name = "<unknown>"; | |
394 | break; | |
395 | } | |
03037b98 MD |
396 | /* |
397 | * We tolerate no failure path after channel creation. It will stay | |
398 | * invariant for the rest of the session. | |
399 | */ | |
a90917c3 | 400 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
401 | chan_param->subbuf_size, |
402 | chan_param->num_subbuf, | |
403 | chan_param->switch_timer_interval, | |
d83004aa JD |
404 | chan_param->read_timer_interval, |
405 | channel_type); | |
03037b98 | 406 | if (!chan) { |
f3d01b96 | 407 | ret = -EINVAL; |
03037b98 MD |
408 | goto chan_error; |
409 | } | |
11b5a3c2 | 410 | chan->file = chan_file; |
c0e31d2e MD |
411 | chan_file->private_data = chan; |
412 | fd_install(chan_fd, chan_file); | |
b0caa15a | 413 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 414 | |
baf20995 MD |
415 | return chan_fd; |
416 | ||
03037b98 | 417 | chan_error: |
c0e31d2e | 418 | fput(chan_file); |
baf20995 MD |
419 | file_error: |
420 | put_unused_fd(chan_fd); | |
421 | fd_error: | |
baf20995 MD |
422 | return ret; |
423 | } | |
424 | ||
425 | /** | |
ad1c05e1 | 426 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 427 | * |
c0e31d2e | 428 | * @file: the file |
baf20995 MD |
429 | * @cmd: the command |
430 | * @arg: command arg | |
431 | * | |
432 | * This ioctl implements lttng commands: | |
38d024ae | 433 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 434 | * Returns a LTTng channel file descriptor |
e64957da MD |
435 | * LTTNG_KERNEL_ENABLE |
436 | * Enables tracing for a session (weak enable) | |
437 | * LTTNG_KERNEL_DISABLE | |
438 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
439 | * LTTNG_KERNEL_METADATA |
440 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
441 | * |
442 | * The returned channel will be deleted when its file descriptor is closed. | |
443 | */ | |
444 | static | |
c0e31d2e | 445 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 446 | { |
a90917c3 | 447 | struct lttng_session *session = file->private_data; |
c0e31d2e | 448 | |
ad1c05e1 | 449 | switch (cmd) { |
6dccd6c1 JD |
450 | case LTTNG_KERNEL_OLD_CHANNEL: |
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 | PER_CPU_CHANNEL); | |
468 | } | |
38d024ae | 469 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
470 | { |
471 | struct lttng_kernel_channel chan_param; | |
472 | ||
473 | if (copy_from_user(&chan_param, | |
38d024ae | 474 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
475 | sizeof(struct lttng_kernel_channel))) |
476 | return -EFAULT; | |
477 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 478 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
479 | } |
480 | case LTTNG_KERNEL_OLD_SESSION_START: | |
481 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 482 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 483 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 484 | return lttng_session_enable(session); |
6dccd6c1 JD |
485 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
486 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 487 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 488 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 489 | return lttng_session_disable(session); |
6dccd6c1 JD |
490 | case LTTNG_KERNEL_OLD_METADATA: |
491 | { | |
492 | struct lttng_kernel_channel chan_param; | |
493 | struct lttng_kernel_old_channel old_chan_param; | |
494 | ||
495 | if (copy_from_user(&old_chan_param, | |
496 | (struct lttng_kernel_old_channel __user *) arg, | |
497 | sizeof(struct lttng_kernel_old_channel))) | |
498 | return -EFAULT; | |
499 | chan_param.overwrite = old_chan_param.overwrite; | |
500 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
501 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
502 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
503 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
504 | chan_param.output = old_chan_param.output; | |
505 | ||
506 | return lttng_abi_create_channel(file, &chan_param, | |
507 | METADATA_CHANNEL); | |
508 | } | |
38d024ae | 509 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
510 | { |
511 | struct lttng_kernel_channel chan_param; | |
512 | ||
513 | if (copy_from_user(&chan_param, | |
514 | (struct lttng_kernel_channel __user *) arg, | |
515 | sizeof(struct lttng_kernel_channel))) | |
516 | return -EFAULT; | |
517 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 518 | METADATA_CHANNEL); |
6dccd6c1 | 519 | } |
ad1c05e1 MD |
520 | default: |
521 | return -ENOIOCTLCMD; | |
522 | } | |
523 | } | |
524 | ||
03037b98 MD |
525 | /* |
526 | * Called when the last file reference is dropped. | |
527 | * | |
528 | * Big fat note: channels and events are invariant for the whole session after | |
529 | * their creation. So this session destruction also destroys all channel and | |
530 | * event structures specific to this session (they are not destroyed when their | |
531 | * individual file is released). | |
532 | */ | |
ad1c05e1 | 533 | static |
03037b98 | 534 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 535 | { |
a90917c3 | 536 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
537 | |
538 | if (session) | |
a90917c3 | 539 | lttng_session_destroy(session); |
11b5a3c2 | 540 | return 0; |
ad1c05e1 | 541 | } |
ad1c05e1 MD |
542 | |
543 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 544 | .owner = THIS_MODULE, |
03037b98 | 545 | .release = lttng_session_release, |
ad1c05e1 MD |
546 | .unlocked_ioctl = lttng_session_ioctl, |
547 | #ifdef CONFIG_COMPAT | |
03037b98 | 548 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 549 | #endif |
11b5a3c2 | 550 | }; |
ad1c05e1 | 551 | |
d83004aa JD |
552 | /** |
553 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
554 | * @filp: the file | |
555 | * @wait: poll table | |
556 | * | |
557 | * Handles the poll operations for the metadata channels. | |
558 | */ | |
ad1c05e1 | 559 | static |
d83004aa JD |
560 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
561 | poll_table *wait) | |
562 | { | |
563 | struct lttng_metadata_stream *stream = filp->private_data; | |
564 | struct lib_ring_buffer *buf = stream->priv; | |
565 | int finalized; | |
566 | unsigned int mask = 0; | |
567 | ||
568 | if (filp->f_mode & FMODE_READ) { | |
569 | poll_wait_set_exclusive(wait); | |
570 | poll_wait(filp, &stream->read_wait, wait); | |
571 | ||
572 | finalized = stream->finalized; | |
573 | ||
574 | /* | |
575 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
576 | * ordering finalized load before offsets loads. | |
577 | */ | |
578 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
579 | ||
580 | if (finalized) | |
581 | mask |= POLLHUP; | |
582 | ||
583 | if (stream->metadata_cache->metadata_written > | |
f613e3e6 | 584 | stream->metadata_out) |
d83004aa JD |
585 | mask |= POLLIN; |
586 | } | |
587 | ||
588 | return mask; | |
589 | } | |
590 | ||
f613e3e6 MD |
591 | static |
592 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
593 | unsigned int cmd, unsigned long arg) | |
594 | { | |
595 | struct lttng_metadata_stream *stream = filp->private_data; | |
596 | ||
597 | stream->metadata_out = stream->metadata_in; | |
598 | } | |
599 | ||
d83004aa JD |
600 | static |
601 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
602 | unsigned int cmd, unsigned long arg) | |
603 | { | |
604 | int ret; | |
605 | struct lttng_metadata_stream *stream = filp->private_data; | |
606 | struct lib_ring_buffer *buf = stream->priv; | |
607 | ||
608 | switch (cmd) { | |
d83004aa JD |
609 | case RING_BUFFER_GET_NEXT_SUBBUF: |
610 | { | |
35097f36 JD |
611 | struct lttng_metadata_stream *stream = filp->private_data; |
612 | struct lib_ring_buffer *buf = stream->priv; | |
613 | struct channel *chan = buf->backend.chan; | |
614 | ||
615 | ret = lttng_metadata_output_channel(stream, chan); | |
616 | if (ret > 0) { | |
617 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
618 | ret = 0; | |
619 | } else if (ret < 0) | |
d83004aa JD |
620 | goto err; |
621 | break; | |
622 | } | |
f613e3e6 MD |
623 | case RING_BUFFER_GET_SUBBUF: |
624 | { | |
625 | /* | |
626 | * Random access is not allowed for metadata channel. | |
627 | */ | |
628 | return -ENOSYS; | |
629 | } | |
35097f36 JD |
630 | case RING_BUFFER_FLUSH: |
631 | { | |
632 | struct lttng_metadata_stream *stream = filp->private_data; | |
633 | struct lib_ring_buffer *buf = stream->priv; | |
634 | struct channel *chan = buf->backend.chan; | |
635 | ||
636 | /* | |
637 | * Before doing the actual ring buffer flush, write up to one | |
638 | * packet of metadata in the ring buffer. | |
639 | */ | |
640 | ret = lttng_metadata_output_channel(stream, chan); | |
641 | if (ret < 0) | |
642 | goto err; | |
643 | break; | |
644 | } | |
d83004aa JD |
645 | default: |
646 | break; | |
647 | } | |
f613e3e6 MD |
648 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
649 | ||
d83004aa | 650 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
651 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
652 | if (ret < 0) | |
653 | goto err; | |
d83004aa | 654 | |
f613e3e6 MD |
655 | switch (cmd) { |
656 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
657 | { | |
658 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
659 | cmd, arg); | |
660 | break; | |
661 | } | |
662 | default: | |
663 | break; | |
664 | } | |
d83004aa JD |
665 | err: |
666 | return ret; | |
667 | } | |
668 | ||
aeb9064d | 669 | #ifdef CONFIG_COMPAT |
d83004aa JD |
670 | static |
671 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
672 | unsigned int cmd, unsigned long arg) | |
673 | { | |
674 | int ret; | |
675 | struct lttng_metadata_stream *stream = filp->private_data; | |
676 | struct lib_ring_buffer *buf = stream->priv; | |
677 | ||
678 | switch (cmd) { | |
d83004aa JD |
679 | case RING_BUFFER_GET_NEXT_SUBBUF: |
680 | { | |
35097f36 JD |
681 | struct lttng_metadata_stream *stream = filp->private_data; |
682 | struct lib_ring_buffer *buf = stream->priv; | |
683 | struct channel *chan = buf->backend.chan; | |
684 | ||
685 | ret = lttng_metadata_output_channel(stream, chan); | |
686 | if (ret > 0) { | |
687 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
688 | ret = 0; | |
689 | } else if (ret < 0) | |
d83004aa JD |
690 | goto err; |
691 | break; | |
692 | } | |
f613e3e6 MD |
693 | case RING_BUFFER_GET_SUBBUF: |
694 | { | |
695 | /* | |
696 | * Random access is not allowed for metadata channel. | |
697 | */ | |
698 | return -ENOSYS; | |
699 | } | |
d83004aa JD |
700 | default: |
701 | break; | |
702 | } | |
f613e3e6 MD |
703 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
704 | ||
d83004aa | 705 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
706 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
707 | if (ret < 0) | |
708 | goto err; | |
d83004aa | 709 | |
f613e3e6 MD |
710 | switch (cmd) { |
711 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
712 | { | |
713 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
714 | cmd, arg); | |
715 | break; | |
716 | } | |
717 | default: | |
718 | break; | |
719 | } | |
d83004aa JD |
720 | err: |
721 | return ret; | |
722 | } | |
aeb9064d | 723 | #endif |
d83004aa | 724 | |
b3b8072b MD |
725 | /* |
726 | * This is not used by anonymous file descriptors. This code is left | |
727 | * there if we ever want to implement an inode with open() operation. | |
728 | */ | |
d83004aa JD |
729 | static |
730 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
731 | { | |
732 | struct lttng_metadata_stream *stream = inode->i_private; | |
733 | struct lib_ring_buffer *buf = stream->priv; | |
734 | ||
735 | file->private_data = buf; | |
b3b8072b MD |
736 | /* |
737 | * Since life-time of metadata cache differs from that of | |
738 | * session, we need to keep our own reference on the transport. | |
739 | */ | |
740 | if (!try_module_get(stream->transport->owner)) { | |
741 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
742 | return -EBUSY; | |
743 | } | |
d83004aa JD |
744 | return lib_ring_buffer_open(inode, file, buf); |
745 | } | |
746 | ||
747 | static | |
748 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
749 | { | |
750 | struct lttng_metadata_stream *stream = file->private_data; | |
751 | struct lib_ring_buffer *buf = stream->priv; | |
752 | ||
753 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 754 | module_put(stream->transport->owner); |
d83004aa JD |
755 | return lib_ring_buffer_release(inode, file, buf); |
756 | } | |
757 | ||
758 | static | |
759 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
760 | struct pipe_inode_info *pipe, size_t len, | |
761 | unsigned int flags) | |
762 | { | |
763 | struct lttng_metadata_stream *stream = in->private_data; | |
764 | struct lib_ring_buffer *buf = stream->priv; | |
765 | ||
766 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
767 | flags, buf); | |
768 | } | |
769 | ||
770 | static | |
771 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
772 | struct vm_area_struct *vma) | |
773 | { | |
774 | struct lttng_metadata_stream *stream = filp->private_data; | |
775 | struct lib_ring_buffer *buf = stream->priv; | |
776 | ||
777 | return lib_ring_buffer_mmap(filp, vma, buf); | |
778 | } | |
779 | ||
780 | static | |
781 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
782 | .owner = THIS_MODULE, | |
783 | .open = lttng_metadata_ring_buffer_open, | |
784 | .release = lttng_metadata_ring_buffer_release, | |
785 | .poll = lttng_metadata_ring_buffer_poll, | |
786 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
787 | .mmap = lttng_metadata_ring_buffer_mmap, | |
788 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
789 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
790 | #ifdef CONFIG_COMPAT | |
791 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
792 | #endif | |
793 | }; | |
794 | ||
795 | static | |
796 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
797 | const struct file_operations *fops) | |
ad1c05e1 | 798 | { |
ad1c05e1 | 799 | int stream_fd, ret; |
11b5a3c2 | 800 | struct file *stream_file; |
ad1c05e1 | 801 | |
1c25284c | 802 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
803 | if (stream_fd < 0) { |
804 | ret = stream_fd; | |
805 | goto fd_error; | |
806 | } | |
d83004aa JD |
807 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
808 | stream_priv, O_RDWR); | |
c0e31d2e MD |
809 | if (IS_ERR(stream_file)) { |
810 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
811 | goto file_error; |
812 | } | |
409453cb MD |
813 | /* |
814 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
815 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
816 | * file descriptor, so we set FMODE_PREAD here. | |
817 | */ | |
d7b6f197 | 818 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 819 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
820 | /* |
821 | * The stream holds a reference to the channel within the generic ring | |
822 | * buffer library, so no need to hold a refcount on the channel and | |
823 | * session files here. | |
824 | */ | |
ad1c05e1 MD |
825 | return stream_fd; |
826 | ||
827 | file_error: | |
828 | put_unused_fd(stream_fd); | |
d83004aa JD |
829 | fd_error: |
830 | return ret; | |
831 | } | |
832 | ||
833 | static | |
834 | int lttng_abi_open_stream(struct file *channel_file) | |
835 | { | |
836 | struct lttng_channel *channel = channel_file->private_data; | |
837 | struct lib_ring_buffer *buf; | |
838 | int ret; | |
839 | void *stream_priv; | |
840 | ||
841 | buf = channel->ops->buffer_read_open(channel->chan); | |
842 | if (!buf) | |
843 | return -ENOENT; | |
844 | ||
845 | stream_priv = buf; | |
846 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 847 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
848 | if (ret < 0) |
849 | goto fd_error; | |
850 | ||
851 | return ret; | |
852 | ||
853 | fd_error: | |
854 | channel->ops->buffer_read_close(buf); | |
855 | return ret; | |
856 | } | |
857 | ||
858 | static | |
859 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
860 | { | |
861 | struct lttng_channel *channel = channel_file->private_data; | |
862 | struct lttng_session *session = channel->session; | |
863 | struct lib_ring_buffer *buf; | |
864 | int ret; | |
865 | struct lttng_metadata_stream *metadata_stream; | |
866 | void *stream_priv; | |
867 | ||
868 | buf = channel->ops->buffer_read_open(channel->chan); | |
869 | if (!buf) | |
870 | return -ENOENT; | |
871 | ||
872 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
873 | GFP_KERNEL); | |
b3b8072b MD |
874 | if (!metadata_stream) { |
875 | ret = -ENOMEM; | |
876 | goto nomem; | |
877 | } | |
d83004aa JD |
878 | metadata_stream->metadata_cache = session->metadata_cache; |
879 | init_waitqueue_head(&metadata_stream->read_wait); | |
880 | metadata_stream->priv = buf; | |
881 | stream_priv = metadata_stream; | |
b3b8072b | 882 | metadata_stream->transport = channel->transport; |
de23d59d | 883 | mutex_init(&metadata_stream->lock); |
b3b8072b MD |
884 | |
885 | /* | |
886 | * Since life-time of metadata cache differs from that of | |
887 | * session, we need to keep our own reference on the transport. | |
888 | */ | |
889 | if (!try_module_get(metadata_stream->transport->owner)) { | |
890 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
891 | ret = -EINVAL; | |
892 | goto notransport; | |
893 | } | |
894 | ||
d83004aa JD |
895 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
896 | <tng_metadata_ring_buffer_file_operations); | |
897 | if (ret < 0) | |
898 | goto fd_error; | |
899 | ||
900 | kref_get(&session->metadata_cache->refcount); | |
901 | list_add(&metadata_stream->list, | |
902 | &session->metadata_cache->metadata_stream); | |
903 | return ret; | |
904 | ||
ad1c05e1 | 905 | fd_error: |
b3b8072b MD |
906 | module_put(metadata_stream->transport->owner); |
907 | notransport: | |
908 | kfree(metadata_stream); | |
909 | nomem: | |
11b5a3c2 | 910 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
911 | return ret; |
912 | } | |
913 | ||
653fe716 | 914 | static |
c0e31d2e | 915 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 916 | struct lttng_kernel_event *event_param) |
653fe716 | 917 | { |
a90917c3 MD |
918 | struct lttng_channel *channel = channel_file->private_data; |
919 | struct lttng_event *event; | |
653fe716 | 920 | int event_fd, ret; |
11b5a3c2 | 921 | struct file *event_file; |
653fe716 | 922 | |
6dccd6c1 JD |
923 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
924 | switch (event_param->instrumentation) { | |
7371f44c | 925 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 926 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 927 | break; |
ab2277d6 | 928 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 929 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 930 | break; |
ab2277d6 | 931 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 932 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
933 | break; |
934 | default: | |
935 | break; | |
936 | } | |
6dccd6c1 | 937 | switch (event_param->instrumentation) { |
1ec65de1 MD |
938 | default: |
939 | event_fd = get_unused_fd(); | |
940 | if (event_fd < 0) { | |
941 | ret = event_fd; | |
942 | goto fd_error; | |
943 | } | |
944 | event_file = anon_inode_getfile("[lttng_event]", | |
945 | <tng_event_fops, | |
946 | NULL, O_RDWR); | |
947 | if (IS_ERR(event_file)) { | |
948 | ret = PTR_ERR(event_file); | |
949 | goto file_error; | |
950 | } | |
951 | /* | |
952 | * We tolerate no failure path after event creation. It | |
953 | * will stay invariant for the rest of the session. | |
954 | */ | |
6dccd6c1 | 955 | event = lttng_event_create(channel, event_param, NULL, NULL); |
abc0446a MD |
956 | WARN_ON_ONCE(!event); |
957 | if (IS_ERR(event)) { | |
958 | ret = PTR_ERR(event); | |
1ec65de1 MD |
959 | goto event_error; |
960 | } | |
961 | event_file->private_data = event; | |
962 | fd_install(event_fd, event_file); | |
963 | /* The event holds a reference on the channel */ | |
964 | atomic_long_inc(&channel_file->f_count); | |
965 | break; | |
43880ee8 | 966 | case LTTNG_KERNEL_SYSCALL: |
1ec65de1 MD |
967 | ret = lttng_syscalls_register(channel, NULL); |
968 | if (ret) | |
969 | goto fd_error; | |
970 | event_fd = 0; | |
4ee2453d MD |
971 | if (event_param->u.syscall.enable) { |
972 | ret = lttng_syscall_filter_enable(channel, | |
80f87dd2 MD |
973 | event_param->name[0] == '\0' ? |
974 | NULL : event_param->name); | |
975 | if (ret) | |
976 | goto fd_error; | |
4ee2453d | 977 | |
80f87dd2 | 978 | } else { |
4ee2453d | 979 | ret = lttng_syscall_filter_disable(channel, |
80f87dd2 MD |
980 | event_param->name[0] == '\0' ? |
981 | NULL : event_param->name); | |
982 | if (ret) | |
983 | goto fd_error; | |
984 | } | |
1ec65de1 | 985 | break; |
03037b98 | 986 | } |
653fe716 MD |
987 | return event_fd; |
988 | ||
03037b98 | 989 | event_error: |
c0e31d2e | 990 | fput(event_file); |
653fe716 MD |
991 | file_error: |
992 | put_unused_fd(event_fd); | |
993 | fd_error: | |
653fe716 MD |
994 | return ret; |
995 | } | |
ad1c05e1 MD |
996 | |
997 | /** | |
998 | * lttng_channel_ioctl - lttng syscall through ioctl | |
999 | * | |
c0e31d2e | 1000 | * @file: the file |
ad1c05e1 MD |
1001 | * @cmd: the command |
1002 | * @arg: command arg | |
1003 | * | |
1004 | * This ioctl implements lttng commands: | |
38d024ae | 1005 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1006 | * Returns an event stream file descriptor or failure. |
1007 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1008 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1009 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1010 | * LTTNG_KERNEL_CONTEXT |
1011 | * Prepend a context field to each event in the channel | |
e64957da MD |
1012 | * LTTNG_KERNEL_ENABLE |
1013 | * Enable recording for events in this channel (weak enable) | |
1014 | * LTTNG_KERNEL_DISABLE | |
1015 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1016 | * |
baf20995 MD |
1017 | * Channel and event file descriptors also hold a reference on the session. |
1018 | */ | |
ad1c05e1 | 1019 | static |
c0e31d2e | 1020 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1021 | { |
a90917c3 | 1022 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1023 | |
baf20995 | 1024 | switch (cmd) { |
6dccd6c1 | 1025 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1026 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1027 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1028 | case LTTNG_KERNEL_OLD_EVENT: |
1029 | { | |
1030 | struct lttng_kernel_event *uevent_param; | |
1031 | struct lttng_kernel_old_event *old_uevent_param; | |
1032 | int ret; | |
1033 | ||
1034 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1035 | GFP_KERNEL); | |
1036 | if (!uevent_param) { | |
1037 | ret = -ENOMEM; | |
1038 | goto old_event_end; | |
1039 | } | |
1040 | old_uevent_param = kmalloc( | |
1041 | sizeof(struct lttng_kernel_old_event), | |
1042 | GFP_KERNEL); | |
1043 | if (!old_uevent_param) { | |
1044 | ret = -ENOMEM; | |
1045 | goto old_event_error_free_param; | |
1046 | } | |
1047 | if (copy_from_user(old_uevent_param, | |
1048 | (struct lttng_kernel_old_event __user *) arg, | |
1049 | sizeof(struct lttng_kernel_old_event))) { | |
1050 | ret = -EFAULT; | |
1051 | goto old_event_error_free_old_param; | |
1052 | } | |
1053 | ||
1054 | memcpy(uevent_param->name, old_uevent_param->name, | |
1055 | sizeof(uevent_param->name)); | |
1056 | uevent_param->instrumentation = | |
1057 | old_uevent_param->instrumentation; | |
1058 | ||
1059 | switch (old_uevent_param->instrumentation) { | |
1060 | case LTTNG_KERNEL_KPROBE: | |
1061 | uevent_param->u.kprobe.addr = | |
1062 | old_uevent_param->u.kprobe.addr; | |
1063 | uevent_param->u.kprobe.offset = | |
1064 | old_uevent_param->u.kprobe.offset; | |
1065 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1066 | old_uevent_param->u.kprobe.symbol_name, | |
1067 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1068 | break; | |
1069 | case LTTNG_KERNEL_KRETPROBE: | |
1070 | uevent_param->u.kretprobe.addr = | |
1071 | old_uevent_param->u.kretprobe.addr; | |
1072 | uevent_param->u.kretprobe.offset = | |
1073 | old_uevent_param->u.kretprobe.offset; | |
1074 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1075 | old_uevent_param->u.kretprobe.symbol_name, | |
1076 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1077 | break; | |
1078 | case LTTNG_KERNEL_FUNCTION: | |
1079 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1080 | old_uevent_param->u.ftrace.symbol_name, | |
1081 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1082 | break; | |
1083 | default: | |
1084 | break; | |
1085 | } | |
1086 | ret = lttng_abi_create_event(file, uevent_param); | |
1087 | ||
1088 | old_event_error_free_old_param: | |
1089 | kfree(old_uevent_param); | |
1090 | old_event_error_free_param: | |
1091 | kfree(uevent_param); | |
1092 | old_event_end: | |
1093 | return ret; | |
1094 | } | |
38d024ae | 1095 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1096 | { |
1097 | struct lttng_kernel_event uevent_param; | |
1098 | ||
1099 | if (copy_from_user(&uevent_param, | |
1100 | (struct lttng_kernel_event __user *) arg, | |
1101 | sizeof(uevent_param))) | |
1102 | return -EFAULT; | |
1103 | return lttng_abi_create_event(file, &uevent_param); | |
1104 | } | |
1105 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1106 | { | |
1107 | struct lttng_kernel_context *ucontext_param; | |
1108 | struct lttng_kernel_old_context *old_ucontext_param; | |
1109 | int ret; | |
1110 | ||
1111 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1112 | GFP_KERNEL); | |
1113 | if (!ucontext_param) { | |
1114 | ret = -ENOMEM; | |
1115 | goto old_ctx_end; | |
1116 | } | |
1117 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1118 | GFP_KERNEL); | |
1119 | if (!old_ucontext_param) { | |
1120 | ret = -ENOMEM; | |
1121 | goto old_ctx_error_free_param; | |
1122 | } | |
1123 | ||
1124 | if (copy_from_user(old_ucontext_param, | |
1125 | (struct lttng_kernel_old_context __user *) arg, | |
1126 | sizeof(struct lttng_kernel_old_context))) { | |
1127 | ret = -EFAULT; | |
1128 | goto old_ctx_error_free_old_param; | |
1129 | } | |
1130 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1131 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1132 | sizeof(ucontext_param->padding)); | |
1133 | /* only type that uses the union */ | |
1134 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1135 | ucontext_param->u.perf_counter.type = | |
1136 | old_ucontext_param->u.perf_counter.type; | |
1137 | ucontext_param->u.perf_counter.config = | |
1138 | old_ucontext_param->u.perf_counter.config; | |
1139 | memcpy(ucontext_param->u.perf_counter.name, | |
1140 | old_ucontext_param->u.perf_counter.name, | |
1141 | sizeof(ucontext_param->u.perf_counter.name)); | |
1142 | } | |
1143 | ||
1144 | ret = lttng_abi_add_context(file, | |
1145 | ucontext_param, | |
1146 | &channel->ctx, channel->session); | |
1147 | ||
1148 | old_ctx_error_free_old_param: | |
1149 | kfree(old_ucontext_param); | |
1150 | old_ctx_error_free_param: | |
1151 | kfree(ucontext_param); | |
1152 | old_ctx_end: | |
1153 | return ret; | |
1154 | } | |
8070f5c0 | 1155 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1156 | { |
1157 | struct lttng_kernel_context ucontext_param; | |
1158 | ||
1159 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1160 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1161 | sizeof(ucontext_param))) |
1162 | return -EFAULT; | |
1163 | return lttng_abi_add_context(file, | |
1164 | &ucontext_param, | |
8070f5c0 | 1165 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1166 | } |
1167 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1168 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1169 | return lttng_channel_enable(channel); |
6dccd6c1 | 1170 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1171 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1172 | return lttng_channel_disable(channel); |
12e579db MD |
1173 | case LTTNG_KERNEL_SYSCALL_MASK: |
1174 | return lttng_channel_syscall_mask(channel, | |
1175 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1176 | default: |
1177 | return -ENOIOCTLCMD; | |
1178 | } | |
6dccd6c1 | 1179 | |
baf20995 MD |
1180 | } |
1181 | ||
5dbbdb43 MD |
1182 | /** |
1183 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1184 | * | |
1185 | * @file: the file | |
1186 | * @cmd: the command | |
1187 | * @arg: command arg | |
1188 | * | |
1189 | * This ioctl implements lttng commands: | |
38d024ae | 1190 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1191 | * Returns an event stream file descriptor or failure. |
1192 | * | |
1193 | * Channel and event file descriptors also hold a reference on the session. | |
1194 | */ | |
1195 | static | |
1196 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1197 | { | |
1198 | switch (cmd) { | |
6dccd6c1 | 1199 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1200 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1201 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1202 | default: |
1203 | return -ENOIOCTLCMD; | |
1204 | } | |
1205 | } | |
1206 | ||
653fe716 MD |
1207 | /** |
1208 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1209 | * | |
c0e31d2e | 1210 | * @file: the file |
653fe716 MD |
1211 | * @wait: poll table |
1212 | */ | |
c0e31d2e | 1213 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1214 | { |
a90917c3 | 1215 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1216 | unsigned int mask = 0; |
1217 | ||
c0e31d2e | 1218 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1219 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1220 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1221 | wait); | |
653fe716 | 1222 | |
254ec7bc MD |
1223 | if (channel->ops->is_disabled(channel->chan)) |
1224 | return POLLERR; | |
24cedcfe | 1225 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1226 | return POLLHUP; |
f71ecafa | 1227 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1228 | return POLLIN | POLLRDNORM; |
f71ecafa | 1229 | return 0; |
653fe716 MD |
1230 | } |
1231 | return mask; | |
1232 | ||
1233 | } | |
1234 | ||
0a84a57f MD |
1235 | static |
1236 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1237 | { | |
a90917c3 | 1238 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1239 | |
1240 | if (channel) | |
1241 | fput(channel->session->file); | |
0a84a57f MD |
1242 | return 0; |
1243 | } | |
1244 | ||
d83004aa JD |
1245 | static |
1246 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1247 | { | |
1248 | struct lttng_channel *channel = file->private_data; | |
1249 | ||
1250 | if (channel) { | |
1251 | lttng_metadata_channel_destroy(channel); | |
1252 | fput(channel->session->file); | |
1253 | } | |
1254 | ||
1255 | return 0; | |
1256 | } | |
1257 | ||
ad1c05e1 | 1258 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1259 | .owner = THIS_MODULE, |
03037b98 | 1260 | .release = lttng_channel_release, |
653fe716 | 1261 | .poll = lttng_channel_poll, |
ad1c05e1 | 1262 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1263 | #ifdef CONFIG_COMPAT |
03037b98 | 1264 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1265 | #endif |
11b5a3c2 | 1266 | }; |
baf20995 | 1267 | |
5dbbdb43 | 1268 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1269 | .owner = THIS_MODULE, |
d83004aa | 1270 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1271 | .unlocked_ioctl = lttng_metadata_ioctl, |
1272 | #ifdef CONFIG_COMPAT | |
1273 | .compat_ioctl = lttng_metadata_ioctl, | |
1274 | #endif | |
1275 | }; | |
1276 | ||
8070f5c0 MD |
1277 | /** |
1278 | * lttng_event_ioctl - lttng syscall through ioctl | |
1279 | * | |
1280 | * @file: the file | |
1281 | * @cmd: the command | |
1282 | * @arg: command arg | |
1283 | * | |
1284 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1285 | * LTTNG_KERNEL_CONTEXT |
1286 | * Prepend a context field to each record of this event | |
e64957da MD |
1287 | * LTTNG_KERNEL_ENABLE |
1288 | * Enable recording for this event (weak enable) | |
1289 | * LTTNG_KERNEL_DISABLE | |
1290 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1291 | */ |
1292 | static | |
1293 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1294 | { | |
a90917c3 | 1295 | struct lttng_event *event = file->private_data; |
8070f5c0 MD |
1296 | |
1297 | switch (cmd) { | |
6dccd6c1 JD |
1298 | case LTTNG_KERNEL_OLD_CONTEXT: |
1299 | { | |
1300 | struct lttng_kernel_context *ucontext_param; | |
1301 | struct lttng_kernel_old_context *old_ucontext_param; | |
1302 | int ret; | |
1303 | ||
1304 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1305 | GFP_KERNEL); | |
1306 | if (!ucontext_param) { | |
1307 | ret = -ENOMEM; | |
1308 | goto old_ctx_end; | |
1309 | } | |
1310 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1311 | GFP_KERNEL); | |
1312 | if (!old_ucontext_param) { | |
1313 | ret = -ENOMEM; | |
1314 | goto old_ctx_error_free_param; | |
1315 | } | |
1316 | ||
1317 | if (copy_from_user(old_ucontext_param, | |
1318 | (struct lttng_kernel_old_context __user *) arg, | |
1319 | sizeof(struct lttng_kernel_old_context))) { | |
1320 | ret = -EFAULT; | |
1321 | goto old_ctx_error_free_old_param; | |
1322 | } | |
1323 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1324 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1325 | sizeof(ucontext_param->padding)); | |
1326 | /* only type that uses the union */ | |
1327 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1328 | ucontext_param->u.perf_counter.type = | |
1329 | old_ucontext_param->u.perf_counter.type; | |
1330 | ucontext_param->u.perf_counter.config = | |
1331 | old_ucontext_param->u.perf_counter.config; | |
1332 | memcpy(ucontext_param->u.perf_counter.name, | |
1333 | old_ucontext_param->u.perf_counter.name, | |
1334 | sizeof(ucontext_param->u.perf_counter.name)); | |
1335 | } | |
1336 | ||
1337 | ret = lttng_abi_add_context(file, | |
1338 | ucontext_param, | |
1339 | &event->ctx, event->chan->session); | |
1340 | ||
1341 | old_ctx_error_free_old_param: | |
1342 | kfree(old_ucontext_param); | |
1343 | old_ctx_error_free_param: | |
1344 | kfree(ucontext_param); | |
1345 | old_ctx_end: | |
1346 | return ret; | |
1347 | } | |
8070f5c0 | 1348 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1349 | { |
1350 | struct lttng_kernel_context ucontext_param; | |
1351 | ||
1352 | if (copy_from_user(&ucontext_param, | |
1353 | (struct lttng_kernel_context __user *) arg, | |
1354 | sizeof(ucontext_param))) | |
1355 | return -EFAULT; | |
8070f5c0 | 1356 | return lttng_abi_add_context(file, |
6dccd6c1 | 1357 | &ucontext_param, |
8070f5c0 | 1358 | &event->ctx, event->chan->session); |
6dccd6c1 JD |
1359 | } |
1360 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1361 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1362 | return lttng_event_enable(event); |
6dccd6c1 | 1363 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1364 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1365 | return lttng_event_disable(event); |
8070f5c0 MD |
1366 | default: |
1367 | return -ENOIOCTLCMD; | |
1368 | } | |
1369 | } | |
1370 | ||
0a84a57f MD |
1371 | static |
1372 | int lttng_event_release(struct inode *inode, struct file *file) | |
1373 | { | |
a90917c3 | 1374 | struct lttng_event *event = file->private_data; |
c269fff4 | 1375 | |
aa7c23a9 | 1376 | if (event) |
c269fff4 | 1377 | fput(event->chan->file); |
0a84a57f MD |
1378 | return 0; |
1379 | } | |
1380 | ||
3b923e5b | 1381 | /* TODO: filter control ioctl */ |
0a84a57f | 1382 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1383 | .owner = THIS_MODULE, |
0a84a57f | 1384 | .release = lttng_event_release, |
8070f5c0 MD |
1385 | .unlocked_ioctl = lttng_event_ioctl, |
1386 | #ifdef CONFIG_COMPAT | |
1387 | .compat_ioctl = lttng_event_ioctl, | |
1388 | #endif | |
11b5a3c2 | 1389 | }; |
0a84a57f | 1390 | |
3b731ab1 JD |
1391 | static int put_u64(uint64_t val, unsigned long arg) |
1392 | { | |
1393 | return put_user(val, (uint64_t __user *) arg); | |
1394 | } | |
1395 | ||
ed8d02d6 JD |
1396 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1397 | unsigned int cmd, unsigned long arg) | |
1398 | { | |
3b731ab1 JD |
1399 | struct lib_ring_buffer *buf = filp->private_data; |
1400 | struct channel *chan = buf->backend.chan; | |
1401 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1402 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1403 | int ret; |
1404 | ||
1405 | if (atomic_read(&chan->record_disabled)) | |
1406 | return -EIO; | |
1407 | ||
ed8d02d6 | 1408 | switch (cmd) { |
3b731ab1 JD |
1409 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1410 | { | |
1411 | uint64_t ts; | |
1412 | ||
dd5a0db3 | 1413 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1414 | if (ret < 0) |
1415 | goto error; | |
1416 | return put_u64(ts, arg); | |
1417 | } | |
1418 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1419 | { | |
1420 | uint64_t ts; | |
1421 | ||
dd5a0db3 | 1422 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1423 | if (ret < 0) |
1424 | goto error; | |
1425 | return put_u64(ts, arg); | |
1426 | } | |
1427 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1428 | { | |
1429 | uint64_t ed; | |
1430 | ||
dd5a0db3 | 1431 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1432 | if (ret < 0) |
1433 | goto error; | |
1434 | return put_u64(ed, arg); | |
1435 | } | |
1436 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1437 | { | |
1438 | uint64_t cs; | |
1439 | ||
dd5a0db3 | 1440 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1441 | if (ret < 0) |
1442 | goto error; | |
1443 | return put_u64(cs, arg); | |
1444 | } | |
1445 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1446 | { | |
1447 | uint64_t ps; | |
1448 | ||
dd5a0db3 | 1449 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1450 | if (ret < 0) |
1451 | goto error; | |
1452 | return put_u64(ps, arg); | |
1453 | } | |
1454 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1455 | { | |
1456 | uint64_t si; | |
1457 | ||
dd5a0db3 | 1458 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1459 | if (ret < 0) |
1460 | goto error; | |
1461 | return put_u64(si, arg); | |
1462 | } | |
2348ca17 JD |
1463 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1464 | { | |
1465 | uint64_t ts; | |
1466 | ||
dd5a0db3 | 1467 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1468 | if (ret < 0) |
1469 | goto error; | |
1470 | return put_u64(ts, arg); | |
1471 | } | |
3b731ab1 JD |
1472 | default: |
1473 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1474 | cmd, arg); | |
ed8d02d6 | 1475 | } |
3b731ab1 JD |
1476 | |
1477 | error: | |
1478 | return -ENOSYS; | |
ed8d02d6 JD |
1479 | } |
1480 | ||
1481 | #ifdef CONFIG_COMPAT | |
1482 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1483 | unsigned int cmd, unsigned long arg) | |
1484 | { | |
3b731ab1 JD |
1485 | struct lib_ring_buffer *buf = filp->private_data; |
1486 | struct channel *chan = buf->backend.chan; | |
1487 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1488 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1489 | int ret; |
1490 | ||
1491 | if (atomic_read(&chan->record_disabled)) | |
1492 | return -EIO; | |
1493 | ||
ed8d02d6 | 1494 | switch (cmd) { |
3b731ab1 JD |
1495 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1496 | { | |
1497 | uint64_t ts; | |
1498 | ||
dd5a0db3 | 1499 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1500 | if (ret < 0) |
1501 | goto error; | |
1502 | return put_u64(ts, arg); | |
1503 | } | |
1504 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1505 | { | |
1506 | uint64_t ts; | |
1507 | ||
dd5a0db3 | 1508 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1509 | if (ret < 0) |
1510 | goto error; | |
1511 | return put_u64(ts, arg); | |
1512 | } | |
1513 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1514 | { | |
1515 | uint64_t ed; | |
1516 | ||
dd5a0db3 | 1517 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1518 | if (ret < 0) |
1519 | goto error; | |
1520 | return put_u64(ed, arg); | |
ed8d02d6 | 1521 | } |
3b731ab1 JD |
1522 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1523 | { | |
1524 | uint64_t cs; | |
1525 | ||
dd5a0db3 | 1526 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1527 | if (ret < 0) |
1528 | goto error; | |
1529 | return put_u64(cs, arg); | |
1530 | } | |
1531 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1532 | { | |
1533 | uint64_t ps; | |
1534 | ||
dd5a0db3 | 1535 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1536 | if (ret < 0) |
1537 | goto error; | |
1538 | return put_u64(ps, arg); | |
1539 | } | |
1540 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1541 | { | |
1542 | uint64_t si; | |
1543 | ||
dd5a0db3 | 1544 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1545 | if (ret < 0) |
1546 | goto error; | |
1547 | return put_u64(si, arg); | |
1548 | } | |
2348ca17 JD |
1549 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1550 | { | |
1551 | uint64_t ts; | |
1552 | ||
dd5a0db3 | 1553 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1554 | if (ret < 0) |
1555 | goto error; | |
1556 | return put_u64(ts, arg); | |
1557 | } | |
3b731ab1 JD |
1558 | default: |
1559 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1560 | cmd, arg); | |
1561 | } | |
1562 | ||
1563 | error: | |
1564 | return -ENOSYS; | |
ed8d02d6 JD |
1565 | } |
1566 | #endif /* CONFIG_COMPAT */ | |
1567 | ||
1568 | static void lttng_stream_override_ring_buffer_fops(void) | |
1569 | { | |
1570 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1571 | lttng_stream_ring_buffer_file_operations.open = | |
1572 | lib_ring_buffer_file_operations.open; | |
1573 | lttng_stream_ring_buffer_file_operations.release = | |
1574 | lib_ring_buffer_file_operations.release; | |
1575 | lttng_stream_ring_buffer_file_operations.poll = | |
1576 | lib_ring_buffer_file_operations.poll; | |
1577 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1578 | lib_ring_buffer_file_operations.splice_read; | |
1579 | lttng_stream_ring_buffer_file_operations.mmap = | |
1580 | lib_ring_buffer_file_operations.mmap; | |
1581 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1582 | lttng_stream_ring_buffer_ioctl; | |
1583 | lttng_stream_ring_buffer_file_operations.llseek = | |
1584 | lib_ring_buffer_file_operations.llseek; | |
1585 | #ifdef CONFIG_COMPAT | |
1586 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1587 | lttng_stream_ring_buffer_compat_ioctl; | |
1588 | #endif | |
1589 | } | |
1590 | ||
80996790 | 1591 | int __init lttng_abi_init(void) |
baf20995 MD |
1592 | { |
1593 | int ret = 0; | |
1594 | ||
6d2a620c | 1595 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1596 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1597 | <tng_fops, NULL); |
1598 | ||
255e52a4 | 1599 | if (!lttng_proc_dentry) { |
baf20995 MD |
1600 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1601 | ret = -ENOMEM; | |
1602 | goto error; | |
1603 | } | |
ed8d02d6 JD |
1604 | lttng_stream_override_ring_buffer_fops(); |
1605 | ||
baf20995 MD |
1606 | error: |
1607 | return ret; | |
1608 | } | |
1609 | ||
e6e65fcd MD |
1610 | /* No __exit annotation because used by init error path too. */ |
1611 | void lttng_abi_exit(void) | |
baf20995 | 1612 | { |
e6a17f26 MD |
1613 | if (lttng_proc_dentry) |
1614 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1615 | } |