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" |
4ac10b76 | 52 | #include "wrapper/file.h" |
e8951e63 | 53 | #include "lttng-abi.h" |
6dccd6c1 | 54 | #include "lttng-abi-old.h" |
a90917c3 MD |
55 | #include "lttng-events.h" |
56 | #include "lttng-tracer.h" | |
3b731ab1 | 57 | #include "lib/ringbuffer/frontend_types.h" |
baf20995 MD |
58 | |
59 | /* | |
60 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 61 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
62 | */ |
63 | ||
e6a17f26 | 64 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
65 | static const struct file_operations lttng_fops; |
66 | static const struct file_operations lttng_session_fops; | |
67 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 68 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 69 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 70 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 71 | |
a33c9927 MD |
72 | /* |
73 | * Teardown management: opened file descriptors keep a refcount on the module, | |
74 | * so it can only exit when all file descriptors are closed. | |
75 | */ | |
76 | ||
ad1c05e1 | 77 | static |
baf20995 MD |
78 | int lttng_abi_create_session(void) |
79 | { | |
a90917c3 | 80 | struct lttng_session *session; |
c0e31d2e | 81 | struct file *session_file; |
11b5a3c2 | 82 | int session_fd, ret; |
baf20995 | 83 | |
a90917c3 | 84 | session = lttng_session_create(); |
baf20995 MD |
85 | if (!session) |
86 | return -ENOMEM; | |
4ac10b76 | 87 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
88 | if (session_fd < 0) { |
89 | ret = session_fd; | |
90 | goto fd_error; | |
91 | } | |
c0e31d2e | 92 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 93 | <tng_session_fops, |
baf20995 | 94 | session, O_RDWR); |
c0e31d2e MD |
95 | if (IS_ERR(session_file)) { |
96 | ret = PTR_ERR(session_file); | |
baf20995 MD |
97 | goto file_error; |
98 | } | |
c0e31d2e MD |
99 | session->file = session_file; |
100 | fd_install(session_fd, session_file); | |
baf20995 MD |
101 | return session_fd; |
102 | ||
103 | file_error: | |
104 | put_unused_fd(session_fd); | |
105 | fd_error: | |
a90917c3 | 106 | lttng_session_destroy(session); |
baf20995 MD |
107 | return ret; |
108 | } | |
109 | ||
271b6681 MD |
110 | static |
111 | int lttng_abi_tracepoint_list(void) | |
112 | { | |
113 | struct file *tracepoint_list_file; | |
114 | int file_fd, ret; | |
115 | ||
4ac10b76 | 116 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
117 | if (file_fd < 0) { |
118 | ret = file_fd; | |
119 | goto fd_error; | |
120 | } | |
30f18bf0 | 121 | |
8ee099b6 | 122 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
123 | <tng_tracepoint_list_fops, |
124 | NULL, O_RDWR); | |
125 | if (IS_ERR(tracepoint_list_file)) { | |
126 | ret = PTR_ERR(tracepoint_list_file); | |
127 | goto file_error; | |
128 | } | |
30f18bf0 MD |
129 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
130 | if (ret < 0) | |
131 | goto open_error; | |
271b6681 | 132 | fd_install(file_fd, tracepoint_list_file); |
30f18bf0 MD |
133 | if (file_fd < 0) { |
134 | ret = file_fd; | |
135 | goto fd_error; | |
136 | } | |
271b6681 MD |
137 | return file_fd; |
138 | ||
30f18bf0 MD |
139 | open_error: |
140 | fput(tracepoint_list_file); | |
271b6681 MD |
141 | file_error: |
142 | put_unused_fd(file_fd); | |
143 | fd_error: | |
144 | return ret; | |
145 | } | |
146 | ||
f127e61e MD |
147 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
148 | static inline | |
149 | int lttng_abi_syscall_list(void) | |
150 | { | |
151 | return -ENOSYS; | |
152 | } | |
153 | #else | |
154 | static | |
155 | int lttng_abi_syscall_list(void) | |
156 | { | |
157 | struct file *syscall_list_file; | |
158 | int file_fd, ret; | |
159 | ||
160 | file_fd = lttng_get_unused_fd(); | |
161 | if (file_fd < 0) { | |
162 | ret = file_fd; | |
163 | goto fd_error; | |
164 | } | |
165 | ||
166 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
167 | <tng_syscall_list_fops, | |
168 | NULL, O_RDWR); | |
169 | if (IS_ERR(syscall_list_file)) { | |
170 | ret = PTR_ERR(syscall_list_file); | |
171 | goto file_error; | |
172 | } | |
173 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
174 | if (ret < 0) | |
175 | goto open_error; | |
176 | fd_install(file_fd, syscall_list_file); | |
177 | if (file_fd < 0) { | |
178 | ret = file_fd; | |
179 | goto fd_error; | |
180 | } | |
181 | return file_fd; | |
182 | ||
183 | open_error: | |
184 | fput(syscall_list_file); | |
185 | file_error: | |
186 | put_unused_fd(file_fd); | |
187 | fd_error: | |
188 | return ret; | |
189 | } | |
190 | #endif | |
191 | ||
80c16bcf | 192 | static |
6dccd6c1 | 193 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 194 | { |
6dccd6c1 JD |
195 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
196 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
197 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
198 | } |
199 | ||
42cabb80 MD |
200 | static |
201 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
202 | { | |
203 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
204 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
205 | } | |
206 | ||
8070f5c0 MD |
207 | static |
208 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 209 | struct lttng_kernel_context *context_param, |
a90917c3 | 210 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 211 | { |
8070f5c0 MD |
212 | |
213 | if (session->been_active) | |
214 | return -EPERM; | |
215 | ||
6dccd6c1 | 216 | switch (context_param->ctx) { |
12a313a5 | 217 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 218 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
219 | case LTTNG_KERNEL_CONTEXT_PRIO: |
220 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
221 | case LTTNG_KERNEL_CONTEXT_NICE: |
222 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
223 | case LTTNG_KERNEL_CONTEXT_VPID: |
224 | return lttng_add_vpid_to_ctx(ctx); | |
225 | case LTTNG_KERNEL_CONTEXT_TID: | |
226 | return lttng_add_tid_to_ctx(ctx); | |
227 | case LTTNG_KERNEL_CONTEXT_VTID: | |
228 | return lttng_add_vtid_to_ctx(ctx); | |
229 | case LTTNG_KERNEL_CONTEXT_PPID: | |
230 | return lttng_add_ppid_to_ctx(ctx); | |
231 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
232 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 233 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
234 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
235 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
236 | context_param->u.perf_counter.config, | |
237 | context_param->u.perf_counter.name, | |
c24a0d71 | 238 | ctx); |
a2563e83 MD |
239 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
240 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
241 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
242 | return lttng_add_hostname_to_ctx(ctx); | |
8070f5c0 MD |
243 | default: |
244 | return -EINVAL; | |
245 | } | |
246 | } | |
247 | ||
ad1c05e1 MD |
248 | /** |
249 | * lttng_ioctl - lttng syscall through ioctl | |
250 | * | |
c0e31d2e | 251 | * @file: the file |
ad1c05e1 MD |
252 | * @cmd: the command |
253 | * @arg: command arg | |
254 | * | |
255 | * This ioctl implements lttng commands: | |
38d024ae | 256 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 257 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
258 | * LTTNG_KERNEL_TRACER_VERSION |
259 | * Returns the LTTng kernel tracer version | |
260 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
261 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
262 | * LTTNG_KERNEL_WAIT_QUIESCENT |
263 | * Returns after all previously running probes have completed | |
42cabb80 MD |
264 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
265 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
266 | * |
267 | * The returned session will be deleted when its file descriptor is closed. | |
268 | */ | |
269 | static | |
c0e31d2e | 270 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
271 | { |
272 | switch (cmd) { | |
6dccd6c1 | 273 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 274 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 275 | return lttng_abi_create_session(); |
6dccd6c1 JD |
276 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
277 | { | |
278 | struct lttng_kernel_tracer_version v; | |
279 | struct lttng_kernel_old_tracer_version oldv; | |
280 | struct lttng_kernel_old_tracer_version *uversion = | |
281 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
282 | ||
283 | lttng_abi_tracer_version(&v); | |
284 | oldv.major = v.major; | |
285 | oldv.minor = v.minor; | |
286 | oldv.patchlevel = v.patchlevel; | |
287 | ||
288 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
289 | return -EFAULT; | |
290 | return 0; | |
291 | } | |
80c16bcf | 292 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
293 | { |
294 | struct lttng_kernel_tracer_version version; | |
295 | struct lttng_kernel_tracer_version *uversion = | |
296 | (struct lttng_kernel_tracer_version __user *) arg; | |
297 | ||
298 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
299 | |
300 | if (copy_to_user(uversion, &version, sizeof(version))) | |
301 | return -EFAULT; | |
302 | return 0; | |
303 | } | |
304 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
305 | { | |
306 | struct lttng_kernel_tracer_abi_version version; | |
307 | struct lttng_kernel_tracer_abi_version *uversion = | |
308 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
309 | ||
310 | lttng_abi_tracer_abi_version(&version); | |
311 | ||
6dccd6c1 JD |
312 | if (copy_to_user(uversion, &version, sizeof(version))) |
313 | return -EFAULT; | |
314 | return 0; | |
315 | } | |
316 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
317 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
318 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
319 | case LTTNG_KERNEL_SYSCALL_LIST: |
320 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 321 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
322 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
323 | synchronize_trace(); | |
324 | return 0; | |
6dccd6c1 JD |
325 | case LTTNG_KERNEL_OLD_CALIBRATE: |
326 | { | |
327 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
328 | (struct lttng_kernel_old_calibrate __user *) arg; | |
329 | struct lttng_kernel_old_calibrate old_calibrate; | |
330 | struct lttng_kernel_calibrate calibrate; | |
331 | int ret; | |
332 | ||
333 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
334 | return -EFAULT; | |
335 | calibrate.type = old_calibrate.type; | |
336 | ret = lttng_calibrate(&calibrate); | |
337 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
338 | return -EFAULT; | |
339 | return ret; | |
340 | } | |
57105fc2 MD |
341 | case LTTNG_KERNEL_CALIBRATE: |
342 | { | |
3db41b2c MD |
343 | struct lttng_kernel_calibrate __user *ucalibrate = |
344 | (struct lttng_kernel_calibrate __user *) arg; | |
345 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
346 | int ret; |
347 | ||
348 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
349 | return -EFAULT; | |
350 | ret = lttng_calibrate(&calibrate); | |
351 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
352 | return -EFAULT; | |
353 | return ret; | |
354 | } | |
ad1c05e1 MD |
355 | default: |
356 | return -ENOIOCTLCMD; | |
357 | } | |
358 | } | |
359 | ||
ad1c05e1 | 360 | static const struct file_operations lttng_fops = { |
a33c9927 | 361 | .owner = THIS_MODULE, |
ad1c05e1 MD |
362 | .unlocked_ioctl = lttng_ioctl, |
363 | #ifdef CONFIG_COMPAT | |
03037b98 | 364 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 365 | #endif |
11b5a3c2 | 366 | }; |
ad1c05e1 | 367 | |
5dbbdb43 | 368 | static |
c0e31d2e | 369 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 370 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 371 | enum channel_type channel_type) |
baf20995 | 372 | { |
a90917c3 | 373 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 374 | const struct file_operations *fops = NULL; |
5dbbdb43 | 375 | const char *transport_name; |
a90917c3 | 376 | struct lttng_channel *chan; |
c0e31d2e | 377 | struct file *chan_file; |
baf20995 | 378 | int chan_fd; |
ad1c05e1 | 379 | int ret = 0; |
baf20995 | 380 | |
4ac10b76 | 381 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
382 | if (chan_fd < 0) { |
383 | ret = chan_fd; | |
384 | goto fd_error; | |
385 | } | |
88dfd899 MD |
386 | switch (channel_type) { |
387 | case PER_CPU_CHANNEL: | |
388 | fops = <tng_channel_fops; | |
389 | break; | |
390 | case METADATA_CHANNEL: | |
391 | fops = <tng_metadata_fops; | |
392 | break; | |
393 | } | |
394 | ||
c0e31d2e | 395 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 396 | fops, |
03037b98 | 397 | NULL, O_RDWR); |
c0e31d2e MD |
398 | if (IS_ERR(chan_file)) { |
399 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
400 | goto file_error; |
401 | } | |
5dbbdb43 MD |
402 | switch (channel_type) { |
403 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
404 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
405 | transport_name = chan_param->overwrite ? | |
96ba7208 | 406 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
407 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
408 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
409 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
410 | } else { | |
411 | return -EINVAL; | |
412 | } | |
5dbbdb43 | 413 | break; |
5dbbdb43 | 414 | case METADATA_CHANNEL: |
6dccd6c1 | 415 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 416 | transport_name = "relay-metadata"; |
6dccd6c1 | 417 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
418 | transport_name = "relay-metadata-mmap"; |
419 | else | |
420 | return -EINVAL; | |
5dbbdb43 MD |
421 | break; |
422 | default: | |
423 | transport_name = "<unknown>"; | |
424 | break; | |
425 | } | |
03037b98 MD |
426 | /* |
427 | * We tolerate no failure path after channel creation. It will stay | |
428 | * invariant for the rest of the session. | |
429 | */ | |
a90917c3 | 430 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
431 | chan_param->subbuf_size, |
432 | chan_param->num_subbuf, | |
433 | chan_param->switch_timer_interval, | |
d83004aa JD |
434 | chan_param->read_timer_interval, |
435 | channel_type); | |
03037b98 | 436 | if (!chan) { |
f3d01b96 | 437 | ret = -EINVAL; |
03037b98 MD |
438 | goto chan_error; |
439 | } | |
11b5a3c2 | 440 | chan->file = chan_file; |
c0e31d2e MD |
441 | chan_file->private_data = chan; |
442 | fd_install(chan_fd, chan_file); | |
b0caa15a | 443 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 444 | |
baf20995 MD |
445 | return chan_fd; |
446 | ||
03037b98 | 447 | chan_error: |
c0e31d2e | 448 | fput(chan_file); |
baf20995 MD |
449 | file_error: |
450 | put_unused_fd(chan_fd); | |
451 | fd_error: | |
baf20995 MD |
452 | return ret; |
453 | } | |
454 | ||
455 | /** | |
ad1c05e1 | 456 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 457 | * |
c0e31d2e | 458 | * @file: the file |
baf20995 MD |
459 | * @cmd: the command |
460 | * @arg: command arg | |
461 | * | |
462 | * This ioctl implements lttng commands: | |
38d024ae | 463 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 464 | * Returns a LTTng channel file descriptor |
e64957da MD |
465 | * LTTNG_KERNEL_ENABLE |
466 | * Enables tracing for a session (weak enable) | |
467 | * LTTNG_KERNEL_DISABLE | |
468 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
469 | * LTTNG_KERNEL_METADATA |
470 | * Returns a LTTng metadata file descriptor | |
e0130fab MD |
471 | * LTTNG_KERNEL_SESSION_TRACK_PID |
472 | * Add PID to session tracker | |
473 | * LTTNG_KERNEL_SESSION_UNTRACK_PID | |
474 | * Remove PID from session tracker | |
ad1c05e1 MD |
475 | * |
476 | * The returned channel will be deleted when its file descriptor is closed. | |
477 | */ | |
478 | static | |
c0e31d2e | 479 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 480 | { |
a90917c3 | 481 | struct lttng_session *session = file->private_data; |
c0e31d2e | 482 | |
ad1c05e1 | 483 | switch (cmd) { |
6dccd6c1 JD |
484 | case LTTNG_KERNEL_OLD_CHANNEL: |
485 | { | |
486 | struct lttng_kernel_channel chan_param; | |
487 | struct lttng_kernel_old_channel old_chan_param; | |
488 | ||
489 | if (copy_from_user(&old_chan_param, | |
490 | (struct lttng_kernel_old_channel __user *) arg, | |
491 | sizeof(struct lttng_kernel_old_channel))) | |
492 | return -EFAULT; | |
493 | chan_param.overwrite = old_chan_param.overwrite; | |
494 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
495 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
496 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
497 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
498 | chan_param.output = old_chan_param.output; | |
499 | ||
500 | return lttng_abi_create_channel(file, &chan_param, | |
501 | PER_CPU_CHANNEL); | |
502 | } | |
38d024ae | 503 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
504 | { |
505 | struct lttng_kernel_channel chan_param; | |
506 | ||
507 | if (copy_from_user(&chan_param, | |
38d024ae | 508 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
509 | sizeof(struct lttng_kernel_channel))) |
510 | return -EFAULT; | |
511 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 512 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
513 | } |
514 | case LTTNG_KERNEL_OLD_SESSION_START: | |
515 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 516 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 517 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 518 | return lttng_session_enable(session); |
6dccd6c1 JD |
519 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
520 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 521 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 522 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 523 | return lttng_session_disable(session); |
6dccd6c1 JD |
524 | case LTTNG_KERNEL_OLD_METADATA: |
525 | { | |
526 | struct lttng_kernel_channel chan_param; | |
527 | struct lttng_kernel_old_channel old_chan_param; | |
528 | ||
529 | if (copy_from_user(&old_chan_param, | |
530 | (struct lttng_kernel_old_channel __user *) arg, | |
531 | sizeof(struct lttng_kernel_old_channel))) | |
532 | return -EFAULT; | |
533 | chan_param.overwrite = old_chan_param.overwrite; | |
534 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
535 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
536 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
537 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
538 | chan_param.output = old_chan_param.output; | |
539 | ||
540 | return lttng_abi_create_channel(file, &chan_param, | |
541 | METADATA_CHANNEL); | |
542 | } | |
38d024ae | 543 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
544 | { |
545 | struct lttng_kernel_channel chan_param; | |
546 | ||
547 | if (copy_from_user(&chan_param, | |
548 | (struct lttng_kernel_channel __user *) arg, | |
549 | sizeof(struct lttng_kernel_channel))) | |
550 | return -EFAULT; | |
551 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 552 | METADATA_CHANNEL); |
6dccd6c1 | 553 | } |
e0130fab MD |
554 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
555 | return lttng_session_track_pid(session, (int) arg); | |
556 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: | |
557 | return lttng_session_untrack_pid(session, (int) arg); | |
7e6f9ef6 MD |
558 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
559 | return lttng_session_list_tracker_pids(session); | |
ad1c05e1 MD |
560 | default: |
561 | return -ENOIOCTLCMD; | |
562 | } | |
563 | } | |
564 | ||
03037b98 MD |
565 | /* |
566 | * Called when the last file reference is dropped. | |
567 | * | |
568 | * Big fat note: channels and events are invariant for the whole session after | |
569 | * their creation. So this session destruction also destroys all channel and | |
570 | * event structures specific to this session (they are not destroyed when their | |
571 | * individual file is released). | |
572 | */ | |
ad1c05e1 | 573 | static |
03037b98 | 574 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 575 | { |
a90917c3 | 576 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
577 | |
578 | if (session) | |
a90917c3 | 579 | lttng_session_destroy(session); |
11b5a3c2 | 580 | return 0; |
ad1c05e1 | 581 | } |
ad1c05e1 MD |
582 | |
583 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 584 | .owner = THIS_MODULE, |
03037b98 | 585 | .release = lttng_session_release, |
ad1c05e1 MD |
586 | .unlocked_ioctl = lttng_session_ioctl, |
587 | #ifdef CONFIG_COMPAT | |
03037b98 | 588 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 589 | #endif |
11b5a3c2 | 590 | }; |
ad1c05e1 | 591 | |
d83004aa JD |
592 | /** |
593 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
594 | * @filp: the file | |
595 | * @wait: poll table | |
596 | * | |
597 | * Handles the poll operations for the metadata channels. | |
598 | */ | |
ad1c05e1 | 599 | static |
d83004aa JD |
600 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
601 | poll_table *wait) | |
602 | { | |
603 | struct lttng_metadata_stream *stream = filp->private_data; | |
604 | struct lib_ring_buffer *buf = stream->priv; | |
605 | int finalized; | |
606 | unsigned int mask = 0; | |
607 | ||
608 | if (filp->f_mode & FMODE_READ) { | |
609 | poll_wait_set_exclusive(wait); | |
610 | poll_wait(filp, &stream->read_wait, wait); | |
611 | ||
612 | finalized = stream->finalized; | |
613 | ||
614 | /* | |
615 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
616 | * ordering finalized load before offsets loads. | |
617 | */ | |
618 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
619 | ||
620 | if (finalized) | |
621 | mask |= POLLHUP; | |
622 | ||
623 | if (stream->metadata_cache->metadata_written > | |
f613e3e6 | 624 | stream->metadata_out) |
d83004aa JD |
625 | mask |= POLLIN; |
626 | } | |
627 | ||
628 | return mask; | |
629 | } | |
630 | ||
f613e3e6 MD |
631 | static |
632 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
633 | unsigned int cmd, unsigned long arg) | |
634 | { | |
635 | struct lttng_metadata_stream *stream = filp->private_data; | |
636 | ||
637 | stream->metadata_out = stream->metadata_in; | |
638 | } | |
639 | ||
d83004aa JD |
640 | static |
641 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
642 | unsigned int cmd, unsigned long arg) | |
643 | { | |
644 | int ret; | |
645 | struct lttng_metadata_stream *stream = filp->private_data; | |
646 | struct lib_ring_buffer *buf = stream->priv; | |
647 | ||
648 | switch (cmd) { | |
d83004aa JD |
649 | case RING_BUFFER_GET_NEXT_SUBBUF: |
650 | { | |
35097f36 JD |
651 | struct lttng_metadata_stream *stream = filp->private_data; |
652 | struct lib_ring_buffer *buf = stream->priv; | |
653 | struct channel *chan = buf->backend.chan; | |
654 | ||
655 | ret = lttng_metadata_output_channel(stream, chan); | |
656 | if (ret > 0) { | |
657 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
658 | ret = 0; | |
659 | } else if (ret < 0) | |
d83004aa JD |
660 | goto err; |
661 | break; | |
662 | } | |
f613e3e6 MD |
663 | case RING_BUFFER_GET_SUBBUF: |
664 | { | |
665 | /* | |
666 | * Random access is not allowed for metadata channel. | |
667 | */ | |
668 | return -ENOSYS; | |
669 | } | |
35097f36 JD |
670 | case RING_BUFFER_FLUSH: |
671 | { | |
672 | struct lttng_metadata_stream *stream = filp->private_data; | |
673 | struct lib_ring_buffer *buf = stream->priv; | |
674 | struct channel *chan = buf->backend.chan; | |
675 | ||
676 | /* | |
677 | * Before doing the actual ring buffer flush, write up to one | |
678 | * packet of metadata in the ring buffer. | |
679 | */ | |
680 | ret = lttng_metadata_output_channel(stream, chan); | |
681 | if (ret < 0) | |
682 | goto err; | |
683 | break; | |
684 | } | |
d83004aa JD |
685 | default: |
686 | break; | |
687 | } | |
f613e3e6 MD |
688 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
689 | ||
d83004aa | 690 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
691 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
692 | if (ret < 0) | |
693 | goto err; | |
d83004aa | 694 | |
f613e3e6 MD |
695 | switch (cmd) { |
696 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
697 | { | |
698 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
699 | cmd, arg); | |
700 | break; | |
701 | } | |
702 | default: | |
703 | break; | |
704 | } | |
d83004aa JD |
705 | err: |
706 | return ret; | |
707 | } | |
708 | ||
aeb9064d | 709 | #ifdef CONFIG_COMPAT |
d83004aa JD |
710 | static |
711 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
712 | unsigned int cmd, unsigned long arg) | |
713 | { | |
714 | int ret; | |
715 | struct lttng_metadata_stream *stream = filp->private_data; | |
716 | struct lib_ring_buffer *buf = stream->priv; | |
717 | ||
718 | switch (cmd) { | |
d83004aa JD |
719 | case RING_BUFFER_GET_NEXT_SUBBUF: |
720 | { | |
35097f36 JD |
721 | struct lttng_metadata_stream *stream = filp->private_data; |
722 | struct lib_ring_buffer *buf = stream->priv; | |
723 | struct channel *chan = buf->backend.chan; | |
724 | ||
725 | ret = lttng_metadata_output_channel(stream, chan); | |
726 | if (ret > 0) { | |
727 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
728 | ret = 0; | |
729 | } else if (ret < 0) | |
d83004aa JD |
730 | goto err; |
731 | break; | |
732 | } | |
f613e3e6 MD |
733 | case RING_BUFFER_GET_SUBBUF: |
734 | { | |
735 | /* | |
736 | * Random access is not allowed for metadata channel. | |
737 | */ | |
738 | return -ENOSYS; | |
739 | } | |
d83004aa JD |
740 | default: |
741 | break; | |
742 | } | |
f613e3e6 MD |
743 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
744 | ||
d83004aa | 745 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
746 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
747 | if (ret < 0) | |
748 | goto err; | |
d83004aa | 749 | |
f613e3e6 MD |
750 | switch (cmd) { |
751 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
752 | { | |
753 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
754 | cmd, arg); | |
755 | break; | |
756 | } | |
757 | default: | |
758 | break; | |
759 | } | |
d83004aa JD |
760 | err: |
761 | return ret; | |
762 | } | |
aeb9064d | 763 | #endif |
d83004aa | 764 | |
b3b8072b MD |
765 | /* |
766 | * This is not used by anonymous file descriptors. This code is left | |
767 | * there if we ever want to implement an inode with open() operation. | |
768 | */ | |
d83004aa JD |
769 | static |
770 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
771 | { | |
772 | struct lttng_metadata_stream *stream = inode->i_private; | |
773 | struct lib_ring_buffer *buf = stream->priv; | |
774 | ||
775 | file->private_data = buf; | |
b3b8072b MD |
776 | /* |
777 | * Since life-time of metadata cache differs from that of | |
778 | * session, we need to keep our own reference on the transport. | |
779 | */ | |
780 | if (!try_module_get(stream->transport->owner)) { | |
781 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
782 | return -EBUSY; | |
783 | } | |
d83004aa JD |
784 | return lib_ring_buffer_open(inode, file, buf); |
785 | } | |
786 | ||
787 | static | |
788 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
789 | { | |
790 | struct lttng_metadata_stream *stream = file->private_data; | |
791 | struct lib_ring_buffer *buf = stream->priv; | |
792 | ||
793 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 794 | module_put(stream->transport->owner); |
d83004aa JD |
795 | return lib_ring_buffer_release(inode, file, buf); |
796 | } | |
797 | ||
798 | static | |
799 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
800 | struct pipe_inode_info *pipe, size_t len, | |
801 | unsigned int flags) | |
802 | { | |
803 | struct lttng_metadata_stream *stream = in->private_data; | |
804 | struct lib_ring_buffer *buf = stream->priv; | |
805 | ||
806 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
807 | flags, buf); | |
808 | } | |
809 | ||
810 | static | |
811 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
812 | struct vm_area_struct *vma) | |
813 | { | |
814 | struct lttng_metadata_stream *stream = filp->private_data; | |
815 | struct lib_ring_buffer *buf = stream->priv; | |
816 | ||
817 | return lib_ring_buffer_mmap(filp, vma, buf); | |
818 | } | |
819 | ||
820 | static | |
821 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
822 | .owner = THIS_MODULE, | |
823 | .open = lttng_metadata_ring_buffer_open, | |
824 | .release = lttng_metadata_ring_buffer_release, | |
825 | .poll = lttng_metadata_ring_buffer_poll, | |
826 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
827 | .mmap = lttng_metadata_ring_buffer_mmap, | |
828 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
829 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
830 | #ifdef CONFIG_COMPAT | |
831 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
832 | #endif | |
833 | }; | |
834 | ||
835 | static | |
836 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
837 | const struct file_operations *fops) | |
ad1c05e1 | 838 | { |
ad1c05e1 | 839 | int stream_fd, ret; |
11b5a3c2 | 840 | struct file *stream_file; |
ad1c05e1 | 841 | |
4ac10b76 | 842 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
843 | if (stream_fd < 0) { |
844 | ret = stream_fd; | |
845 | goto fd_error; | |
846 | } | |
d83004aa JD |
847 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
848 | stream_priv, O_RDWR); | |
c0e31d2e MD |
849 | if (IS_ERR(stream_file)) { |
850 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
851 | goto file_error; |
852 | } | |
409453cb MD |
853 | /* |
854 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
855 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
856 | * file descriptor, so we set FMODE_PREAD here. | |
857 | */ | |
d7b6f197 | 858 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 859 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
860 | /* |
861 | * The stream holds a reference to the channel within the generic ring | |
862 | * buffer library, so no need to hold a refcount on the channel and | |
863 | * session files here. | |
864 | */ | |
ad1c05e1 MD |
865 | return stream_fd; |
866 | ||
867 | file_error: | |
868 | put_unused_fd(stream_fd); | |
d83004aa JD |
869 | fd_error: |
870 | return ret; | |
871 | } | |
872 | ||
873 | static | |
874 | int lttng_abi_open_stream(struct file *channel_file) | |
875 | { | |
876 | struct lttng_channel *channel = channel_file->private_data; | |
877 | struct lib_ring_buffer *buf; | |
878 | int ret; | |
879 | void *stream_priv; | |
880 | ||
881 | buf = channel->ops->buffer_read_open(channel->chan); | |
882 | if (!buf) | |
883 | return -ENOENT; | |
884 | ||
885 | stream_priv = buf; | |
886 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 887 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
888 | if (ret < 0) |
889 | goto fd_error; | |
890 | ||
891 | return ret; | |
892 | ||
893 | fd_error: | |
894 | channel->ops->buffer_read_close(buf); | |
895 | return ret; | |
896 | } | |
897 | ||
898 | static | |
899 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
900 | { | |
901 | struct lttng_channel *channel = channel_file->private_data; | |
902 | struct lttng_session *session = channel->session; | |
903 | struct lib_ring_buffer *buf; | |
904 | int ret; | |
905 | struct lttng_metadata_stream *metadata_stream; | |
906 | void *stream_priv; | |
907 | ||
908 | buf = channel->ops->buffer_read_open(channel->chan); | |
909 | if (!buf) | |
910 | return -ENOENT; | |
911 | ||
912 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
913 | GFP_KERNEL); | |
b3b8072b MD |
914 | if (!metadata_stream) { |
915 | ret = -ENOMEM; | |
916 | goto nomem; | |
917 | } | |
d83004aa JD |
918 | metadata_stream->metadata_cache = session->metadata_cache; |
919 | init_waitqueue_head(&metadata_stream->read_wait); | |
920 | metadata_stream->priv = buf; | |
921 | stream_priv = metadata_stream; | |
b3b8072b | 922 | metadata_stream->transport = channel->transport; |
de23d59d | 923 | mutex_init(&metadata_stream->lock); |
b3b8072b MD |
924 | |
925 | /* | |
926 | * Since life-time of metadata cache differs from that of | |
927 | * session, we need to keep our own reference on the transport. | |
928 | */ | |
929 | if (!try_module_get(metadata_stream->transport->owner)) { | |
930 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
931 | ret = -EINVAL; | |
932 | goto notransport; | |
933 | } | |
934 | ||
d83004aa JD |
935 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
936 | <tng_metadata_ring_buffer_file_operations); | |
937 | if (ret < 0) | |
938 | goto fd_error; | |
939 | ||
940 | kref_get(&session->metadata_cache->refcount); | |
941 | list_add(&metadata_stream->list, | |
942 | &session->metadata_cache->metadata_stream); | |
943 | return ret; | |
944 | ||
ad1c05e1 | 945 | fd_error: |
b3b8072b MD |
946 | module_put(metadata_stream->transport->owner); |
947 | notransport: | |
948 | kfree(metadata_stream); | |
949 | nomem: | |
11b5a3c2 | 950 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
951 | return ret; |
952 | } | |
953 | ||
653fe716 | 954 | static |
c0e31d2e | 955 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 956 | struct lttng_kernel_event *event_param) |
653fe716 | 957 | { |
a90917c3 | 958 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 959 | int event_fd, ret; |
11b5a3c2 | 960 | struct file *event_file; |
3c997079 | 961 | void *priv; |
653fe716 | 962 | |
6dccd6c1 JD |
963 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
964 | switch (event_param->instrumentation) { | |
7371f44c | 965 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 966 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 967 | break; |
ab2277d6 | 968 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 969 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 970 | break; |
ab2277d6 | 971 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 972 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
973 | break; |
974 | default: | |
975 | break; | |
976 | } | |
33a39a3c MD |
977 | event_fd = lttng_get_unused_fd(); |
978 | if (event_fd < 0) { | |
979 | ret = event_fd; | |
980 | goto fd_error; | |
981 | } | |
982 | event_file = anon_inode_getfile("[lttng_event]", | |
983 | <tng_event_fops, | |
984 | NULL, O_RDWR); | |
985 | if (IS_ERR(event_file)) { | |
986 | ret = PTR_ERR(event_file); | |
987 | goto file_error; | |
988 | } | |
989 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT | |
990 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
991 | struct lttng_enabler *enabler; | |
992 | ||
993 | if (event_param->name[strlen(event_param->name) - 1] == '*') { | |
994 | enabler = lttng_enabler_create(LTTNG_ENABLER_WILDCARD, | |
995 | event_param, channel); | |
3c997079 | 996 | } else { |
33a39a3c MD |
997 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
998 | event_param, channel); | |
1ec65de1 | 999 | } |
33a39a3c MD |
1000 | priv = enabler; |
1001 | } else { | |
1002 | struct lttng_event *event; | |
4ee2453d | 1003 | |
33a39a3c MD |
1004 | /* |
1005 | * We tolerate no failure path after event creation. It | |
1006 | * will stay invariant for the rest of the session. | |
1007 | */ | |
1008 | event = lttng_event_create(channel, event_param, | |
1009 | NULL, NULL, | |
1010 | event_param->instrumentation); | |
1011 | WARN_ON_ONCE(!event); | |
1012 | if (IS_ERR(event)) { | |
1013 | ret = PTR_ERR(event); | |
1014 | goto event_error; | |
80f87dd2 | 1015 | } |
33a39a3c | 1016 | priv = event; |
03037b98 | 1017 | } |
33a39a3c MD |
1018 | event_file->private_data = priv; |
1019 | fd_install(event_fd, event_file); | |
1020 | /* The event holds a reference on the channel */ | |
1021 | atomic_long_inc(&channel_file->f_count); | |
653fe716 MD |
1022 | return event_fd; |
1023 | ||
03037b98 | 1024 | event_error: |
c0e31d2e | 1025 | fput(event_file); |
653fe716 MD |
1026 | file_error: |
1027 | put_unused_fd(event_fd); | |
1028 | fd_error: | |
653fe716 MD |
1029 | return ret; |
1030 | } | |
ad1c05e1 MD |
1031 | |
1032 | /** | |
1033 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1034 | * | |
c0e31d2e | 1035 | * @file: the file |
ad1c05e1 MD |
1036 | * @cmd: the command |
1037 | * @arg: command arg | |
1038 | * | |
1039 | * This ioctl implements lttng commands: | |
38d024ae | 1040 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1041 | * Returns an event stream file descriptor or failure. |
1042 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1043 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1044 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1045 | * LTTNG_KERNEL_CONTEXT |
1046 | * Prepend a context field to each event in the channel | |
e64957da MD |
1047 | * LTTNG_KERNEL_ENABLE |
1048 | * Enable recording for events in this channel (weak enable) | |
1049 | * LTTNG_KERNEL_DISABLE | |
1050 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1051 | * |
baf20995 MD |
1052 | * Channel and event file descriptors also hold a reference on the session. |
1053 | */ | |
ad1c05e1 | 1054 | static |
c0e31d2e | 1055 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1056 | { |
a90917c3 | 1057 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1058 | |
baf20995 | 1059 | switch (cmd) { |
6dccd6c1 | 1060 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1061 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1062 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1063 | case LTTNG_KERNEL_OLD_EVENT: |
1064 | { | |
1065 | struct lttng_kernel_event *uevent_param; | |
1066 | struct lttng_kernel_old_event *old_uevent_param; | |
1067 | int ret; | |
1068 | ||
1069 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1070 | GFP_KERNEL); | |
1071 | if (!uevent_param) { | |
1072 | ret = -ENOMEM; | |
1073 | goto old_event_end; | |
1074 | } | |
1075 | old_uevent_param = kmalloc( | |
1076 | sizeof(struct lttng_kernel_old_event), | |
1077 | GFP_KERNEL); | |
1078 | if (!old_uevent_param) { | |
1079 | ret = -ENOMEM; | |
1080 | goto old_event_error_free_param; | |
1081 | } | |
1082 | if (copy_from_user(old_uevent_param, | |
1083 | (struct lttng_kernel_old_event __user *) arg, | |
1084 | sizeof(struct lttng_kernel_old_event))) { | |
1085 | ret = -EFAULT; | |
1086 | goto old_event_error_free_old_param; | |
1087 | } | |
1088 | ||
1089 | memcpy(uevent_param->name, old_uevent_param->name, | |
1090 | sizeof(uevent_param->name)); | |
1091 | uevent_param->instrumentation = | |
1092 | old_uevent_param->instrumentation; | |
1093 | ||
1094 | switch (old_uevent_param->instrumentation) { | |
1095 | case LTTNG_KERNEL_KPROBE: | |
1096 | uevent_param->u.kprobe.addr = | |
1097 | old_uevent_param->u.kprobe.addr; | |
1098 | uevent_param->u.kprobe.offset = | |
1099 | old_uevent_param->u.kprobe.offset; | |
1100 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1101 | old_uevent_param->u.kprobe.symbol_name, | |
1102 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1103 | break; | |
1104 | case LTTNG_KERNEL_KRETPROBE: | |
1105 | uevent_param->u.kretprobe.addr = | |
1106 | old_uevent_param->u.kretprobe.addr; | |
1107 | uevent_param->u.kretprobe.offset = | |
1108 | old_uevent_param->u.kretprobe.offset; | |
1109 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1110 | old_uevent_param->u.kretprobe.symbol_name, | |
1111 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1112 | break; | |
1113 | case LTTNG_KERNEL_FUNCTION: | |
1114 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1115 | old_uevent_param->u.ftrace.symbol_name, | |
1116 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1117 | break; | |
1118 | default: | |
1119 | break; | |
1120 | } | |
1121 | ret = lttng_abi_create_event(file, uevent_param); | |
1122 | ||
1123 | old_event_error_free_old_param: | |
1124 | kfree(old_uevent_param); | |
1125 | old_event_error_free_param: | |
1126 | kfree(uevent_param); | |
1127 | old_event_end: | |
1128 | return ret; | |
1129 | } | |
38d024ae | 1130 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1131 | { |
1132 | struct lttng_kernel_event uevent_param; | |
1133 | ||
1134 | if (copy_from_user(&uevent_param, | |
1135 | (struct lttng_kernel_event __user *) arg, | |
1136 | sizeof(uevent_param))) | |
1137 | return -EFAULT; | |
1138 | return lttng_abi_create_event(file, &uevent_param); | |
1139 | } | |
1140 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1141 | { | |
1142 | struct lttng_kernel_context *ucontext_param; | |
1143 | struct lttng_kernel_old_context *old_ucontext_param; | |
1144 | int ret; | |
1145 | ||
1146 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1147 | GFP_KERNEL); | |
1148 | if (!ucontext_param) { | |
1149 | ret = -ENOMEM; | |
1150 | goto old_ctx_end; | |
1151 | } | |
1152 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1153 | GFP_KERNEL); | |
1154 | if (!old_ucontext_param) { | |
1155 | ret = -ENOMEM; | |
1156 | goto old_ctx_error_free_param; | |
1157 | } | |
1158 | ||
1159 | if (copy_from_user(old_ucontext_param, | |
1160 | (struct lttng_kernel_old_context __user *) arg, | |
1161 | sizeof(struct lttng_kernel_old_context))) { | |
1162 | ret = -EFAULT; | |
1163 | goto old_ctx_error_free_old_param; | |
1164 | } | |
1165 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1166 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1167 | sizeof(ucontext_param->padding)); | |
1168 | /* only type that uses the union */ | |
1169 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1170 | ucontext_param->u.perf_counter.type = | |
1171 | old_ucontext_param->u.perf_counter.type; | |
1172 | ucontext_param->u.perf_counter.config = | |
1173 | old_ucontext_param->u.perf_counter.config; | |
1174 | memcpy(ucontext_param->u.perf_counter.name, | |
1175 | old_ucontext_param->u.perf_counter.name, | |
1176 | sizeof(ucontext_param->u.perf_counter.name)); | |
1177 | } | |
1178 | ||
1179 | ret = lttng_abi_add_context(file, | |
1180 | ucontext_param, | |
1181 | &channel->ctx, channel->session); | |
1182 | ||
1183 | old_ctx_error_free_old_param: | |
1184 | kfree(old_ucontext_param); | |
1185 | old_ctx_error_free_param: | |
1186 | kfree(ucontext_param); | |
1187 | old_ctx_end: | |
1188 | return ret; | |
1189 | } | |
8070f5c0 | 1190 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1191 | { |
1192 | struct lttng_kernel_context ucontext_param; | |
1193 | ||
1194 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1195 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1196 | sizeof(ucontext_param))) |
1197 | return -EFAULT; | |
1198 | return lttng_abi_add_context(file, | |
1199 | &ucontext_param, | |
8070f5c0 | 1200 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1201 | } |
1202 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1203 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1204 | return lttng_channel_enable(channel); |
6dccd6c1 | 1205 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1206 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1207 | return lttng_channel_disable(channel); |
12e579db MD |
1208 | case LTTNG_KERNEL_SYSCALL_MASK: |
1209 | return lttng_channel_syscall_mask(channel, | |
1210 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1211 | default: |
1212 | return -ENOIOCTLCMD; | |
1213 | } | |
6dccd6c1 | 1214 | |
baf20995 MD |
1215 | } |
1216 | ||
5dbbdb43 MD |
1217 | /** |
1218 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1219 | * | |
1220 | * @file: the file | |
1221 | * @cmd: the command | |
1222 | * @arg: command arg | |
1223 | * | |
1224 | * This ioctl implements lttng commands: | |
38d024ae | 1225 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1226 | * Returns an event stream file descriptor or failure. |
1227 | * | |
1228 | * Channel and event file descriptors also hold a reference on the session. | |
1229 | */ | |
1230 | static | |
1231 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1232 | { | |
1233 | switch (cmd) { | |
6dccd6c1 | 1234 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1235 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1236 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1237 | default: |
1238 | return -ENOIOCTLCMD; | |
1239 | } | |
1240 | } | |
1241 | ||
653fe716 MD |
1242 | /** |
1243 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1244 | * | |
c0e31d2e | 1245 | * @file: the file |
653fe716 MD |
1246 | * @wait: poll table |
1247 | */ | |
c0e31d2e | 1248 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1249 | { |
a90917c3 | 1250 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1251 | unsigned int mask = 0; |
1252 | ||
c0e31d2e | 1253 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1254 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1255 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1256 | wait); | |
653fe716 | 1257 | |
254ec7bc MD |
1258 | if (channel->ops->is_disabled(channel->chan)) |
1259 | return POLLERR; | |
24cedcfe | 1260 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1261 | return POLLHUP; |
f71ecafa | 1262 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1263 | return POLLIN | POLLRDNORM; |
f71ecafa | 1264 | return 0; |
653fe716 MD |
1265 | } |
1266 | return mask; | |
1267 | ||
1268 | } | |
1269 | ||
0a84a57f MD |
1270 | static |
1271 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1272 | { | |
a90917c3 | 1273 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1274 | |
1275 | if (channel) | |
1276 | fput(channel->session->file); | |
0a84a57f MD |
1277 | return 0; |
1278 | } | |
1279 | ||
d83004aa JD |
1280 | static |
1281 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1282 | { | |
1283 | struct lttng_channel *channel = file->private_data; | |
1284 | ||
1285 | if (channel) { | |
1286 | lttng_metadata_channel_destroy(channel); | |
1287 | fput(channel->session->file); | |
1288 | } | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
ad1c05e1 | 1293 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1294 | .owner = THIS_MODULE, |
03037b98 | 1295 | .release = lttng_channel_release, |
653fe716 | 1296 | .poll = lttng_channel_poll, |
ad1c05e1 | 1297 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1298 | #ifdef CONFIG_COMPAT |
03037b98 | 1299 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1300 | #endif |
11b5a3c2 | 1301 | }; |
baf20995 | 1302 | |
5dbbdb43 | 1303 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1304 | .owner = THIS_MODULE, |
d83004aa | 1305 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1306 | .unlocked_ioctl = lttng_metadata_ioctl, |
1307 | #ifdef CONFIG_COMPAT | |
1308 | .compat_ioctl = lttng_metadata_ioctl, | |
1309 | #endif | |
1310 | }; | |
1311 | ||
8070f5c0 MD |
1312 | /** |
1313 | * lttng_event_ioctl - lttng syscall through ioctl | |
1314 | * | |
1315 | * @file: the file | |
1316 | * @cmd: the command | |
1317 | * @arg: command arg | |
1318 | * | |
1319 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1320 | * LTTNG_KERNEL_CONTEXT |
1321 | * Prepend a context field to each record of this event | |
e64957da MD |
1322 | * LTTNG_KERNEL_ENABLE |
1323 | * Enable recording for this event (weak enable) | |
1324 | * LTTNG_KERNEL_DISABLE | |
1325 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1326 | */ |
1327 | static | |
1328 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1329 | { | |
3c997079 MD |
1330 | struct lttng_event *event; |
1331 | struct lttng_enabler *enabler; | |
1332 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1333 | |
1334 | switch (cmd) { | |
6dccd6c1 JD |
1335 | case LTTNG_KERNEL_OLD_CONTEXT: |
1336 | { | |
3c997079 MD |
1337 | /* Not implemented */ |
1338 | return -ENOSYS; | |
6dccd6c1 | 1339 | } |
8070f5c0 | 1340 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1341 | { |
3c997079 MD |
1342 | /* Not implemented */ |
1343 | return -ENOSYS; | |
6dccd6c1 JD |
1344 | } |
1345 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1346 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1347 | switch (*evtype) { |
1348 | case LTTNG_TYPE_EVENT: | |
1349 | event = file->private_data; | |
1350 | return lttng_event_enable(event); | |
1351 | case LTTNG_TYPE_ENABLER: | |
1352 | enabler = file->private_data; | |
1353 | return lttng_enabler_enable(enabler); | |
1354 | default: | |
1355 | WARN_ON_ONCE(1); | |
1356 | return -ENOSYS; | |
1357 | } | |
6dccd6c1 | 1358 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1359 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1360 | switch (*evtype) { |
1361 | case LTTNG_TYPE_EVENT: | |
1362 | event = file->private_data; | |
1363 | return lttng_event_disable(event); | |
1364 | case LTTNG_TYPE_ENABLER: | |
1365 | enabler = file->private_data; | |
1366 | return lttng_enabler_disable(enabler); | |
1367 | default: | |
1368 | WARN_ON_ONCE(1); | |
1369 | return -ENOSYS; | |
1370 | } | |
07dfc1d0 MD |
1371 | case LTTNG_KERNEL_FILTER: |
1372 | switch (*evtype) { | |
1373 | case LTTNG_TYPE_EVENT: | |
1374 | return -EINVAL; | |
1375 | case LTTNG_TYPE_ENABLER: | |
1376 | { | |
1377 | enabler = file->private_data; | |
1378 | return lttng_enabler_attach_bytecode(enabler, | |
1379 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1380 | } | |
1381 | ||
1382 | } | |
8070f5c0 MD |
1383 | default: |
1384 | return -ENOIOCTLCMD; | |
1385 | } | |
1386 | } | |
1387 | ||
0a84a57f MD |
1388 | static |
1389 | int lttng_event_release(struct inode *inode, struct file *file) | |
1390 | { | |
3c997079 MD |
1391 | struct lttng_event *event; |
1392 | struct lttng_enabler *enabler; | |
1393 | enum lttng_event_type *evtype = file->private_data; | |
1394 | ||
1395 | if (!evtype) | |
1396 | return 0; | |
1397 | ||
1398 | switch (*evtype) { | |
1399 | case LTTNG_TYPE_EVENT: | |
1400 | event = file->private_data; | |
1401 | if (event) | |
1402 | fput(event->chan->file); | |
1403 | break; | |
1404 | case LTTNG_TYPE_ENABLER: | |
1405 | enabler = file->private_data; | |
1406 | if (enabler) | |
1407 | fput(enabler->chan->file); | |
1408 | break; | |
1409 | default: | |
1410 | WARN_ON_ONCE(1); | |
1411 | break; | |
1412 | } | |
c269fff4 | 1413 | |
0a84a57f MD |
1414 | return 0; |
1415 | } | |
1416 | ||
3b923e5b | 1417 | /* TODO: filter control ioctl */ |
0a84a57f | 1418 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1419 | .owner = THIS_MODULE, |
0a84a57f | 1420 | .release = lttng_event_release, |
8070f5c0 MD |
1421 | .unlocked_ioctl = lttng_event_ioctl, |
1422 | #ifdef CONFIG_COMPAT | |
1423 | .compat_ioctl = lttng_event_ioctl, | |
1424 | #endif | |
11b5a3c2 | 1425 | }; |
0a84a57f | 1426 | |
3b731ab1 JD |
1427 | static int put_u64(uint64_t val, unsigned long arg) |
1428 | { | |
1429 | return put_user(val, (uint64_t __user *) arg); | |
1430 | } | |
1431 | ||
ed8d02d6 JD |
1432 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1433 | unsigned int cmd, unsigned long arg) | |
1434 | { | |
3b731ab1 JD |
1435 | struct lib_ring_buffer *buf = filp->private_data; |
1436 | struct channel *chan = buf->backend.chan; | |
1437 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1438 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1439 | int ret; |
1440 | ||
1441 | if (atomic_read(&chan->record_disabled)) | |
1442 | return -EIO; | |
1443 | ||
ed8d02d6 | 1444 | switch (cmd) { |
3b731ab1 JD |
1445 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1446 | { | |
1447 | uint64_t ts; | |
1448 | ||
dd5a0db3 | 1449 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1450 | if (ret < 0) |
1451 | goto error; | |
1452 | return put_u64(ts, arg); | |
1453 | } | |
1454 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1455 | { | |
1456 | uint64_t ts; | |
1457 | ||
dd5a0db3 | 1458 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1459 | if (ret < 0) |
1460 | goto error; | |
1461 | return put_u64(ts, arg); | |
1462 | } | |
1463 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1464 | { | |
1465 | uint64_t ed; | |
1466 | ||
dd5a0db3 | 1467 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1468 | if (ret < 0) |
1469 | goto error; | |
1470 | return put_u64(ed, arg); | |
1471 | } | |
1472 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1473 | { | |
1474 | uint64_t cs; | |
1475 | ||
dd5a0db3 | 1476 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1477 | if (ret < 0) |
1478 | goto error; | |
1479 | return put_u64(cs, arg); | |
1480 | } | |
1481 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1482 | { | |
1483 | uint64_t ps; | |
1484 | ||
dd5a0db3 | 1485 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1486 | if (ret < 0) |
1487 | goto error; | |
1488 | return put_u64(ps, arg); | |
1489 | } | |
1490 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1491 | { | |
1492 | uint64_t si; | |
1493 | ||
dd5a0db3 | 1494 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1495 | if (ret < 0) |
1496 | goto error; | |
1497 | return put_u64(si, arg); | |
1498 | } | |
2348ca17 JD |
1499 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1500 | { | |
1501 | uint64_t ts; | |
1502 | ||
dd5a0db3 | 1503 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1504 | if (ret < 0) |
1505 | goto error; | |
1506 | return put_u64(ts, arg); | |
1507 | } | |
3b731ab1 JD |
1508 | default: |
1509 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1510 | cmd, arg); | |
ed8d02d6 | 1511 | } |
3b731ab1 JD |
1512 | |
1513 | error: | |
1514 | return -ENOSYS; | |
ed8d02d6 JD |
1515 | } |
1516 | ||
1517 | #ifdef CONFIG_COMPAT | |
1518 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1519 | unsigned int cmd, unsigned long arg) | |
1520 | { | |
3b731ab1 JD |
1521 | struct lib_ring_buffer *buf = filp->private_data; |
1522 | struct channel *chan = buf->backend.chan; | |
1523 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1524 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1525 | int ret; |
1526 | ||
1527 | if (atomic_read(&chan->record_disabled)) | |
1528 | return -EIO; | |
1529 | ||
ed8d02d6 | 1530 | switch (cmd) { |
3b731ab1 JD |
1531 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1532 | { | |
1533 | uint64_t ts; | |
1534 | ||
dd5a0db3 | 1535 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1536 | if (ret < 0) |
1537 | goto error; | |
1538 | return put_u64(ts, arg); | |
1539 | } | |
1540 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1541 | { | |
1542 | uint64_t ts; | |
1543 | ||
dd5a0db3 | 1544 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1545 | if (ret < 0) |
1546 | goto error; | |
1547 | return put_u64(ts, arg); | |
1548 | } | |
1549 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1550 | { | |
1551 | uint64_t ed; | |
1552 | ||
dd5a0db3 | 1553 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1554 | if (ret < 0) |
1555 | goto error; | |
1556 | return put_u64(ed, arg); | |
ed8d02d6 | 1557 | } |
3b731ab1 JD |
1558 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1559 | { | |
1560 | uint64_t cs; | |
1561 | ||
dd5a0db3 | 1562 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1563 | if (ret < 0) |
1564 | goto error; | |
1565 | return put_u64(cs, arg); | |
1566 | } | |
1567 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1568 | { | |
1569 | uint64_t ps; | |
1570 | ||
dd5a0db3 | 1571 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1572 | if (ret < 0) |
1573 | goto error; | |
1574 | return put_u64(ps, arg); | |
1575 | } | |
1576 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1577 | { | |
1578 | uint64_t si; | |
1579 | ||
dd5a0db3 | 1580 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1581 | if (ret < 0) |
1582 | goto error; | |
1583 | return put_u64(si, arg); | |
1584 | } | |
2348ca17 JD |
1585 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1586 | { | |
1587 | uint64_t ts; | |
1588 | ||
dd5a0db3 | 1589 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1590 | if (ret < 0) |
1591 | goto error; | |
1592 | return put_u64(ts, arg); | |
1593 | } | |
3b731ab1 JD |
1594 | default: |
1595 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1596 | cmd, arg); | |
1597 | } | |
1598 | ||
1599 | error: | |
1600 | return -ENOSYS; | |
ed8d02d6 JD |
1601 | } |
1602 | #endif /* CONFIG_COMPAT */ | |
1603 | ||
1604 | static void lttng_stream_override_ring_buffer_fops(void) | |
1605 | { | |
1606 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1607 | lttng_stream_ring_buffer_file_operations.open = | |
1608 | lib_ring_buffer_file_operations.open; | |
1609 | lttng_stream_ring_buffer_file_operations.release = | |
1610 | lib_ring_buffer_file_operations.release; | |
1611 | lttng_stream_ring_buffer_file_operations.poll = | |
1612 | lib_ring_buffer_file_operations.poll; | |
1613 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1614 | lib_ring_buffer_file_operations.splice_read; | |
1615 | lttng_stream_ring_buffer_file_operations.mmap = | |
1616 | lib_ring_buffer_file_operations.mmap; | |
1617 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1618 | lttng_stream_ring_buffer_ioctl; | |
1619 | lttng_stream_ring_buffer_file_operations.llseek = | |
1620 | lib_ring_buffer_file_operations.llseek; | |
1621 | #ifdef CONFIG_COMPAT | |
1622 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1623 | lttng_stream_ring_buffer_compat_ioctl; | |
1624 | #endif | |
1625 | } | |
1626 | ||
80996790 | 1627 | int __init lttng_abi_init(void) |
baf20995 MD |
1628 | { |
1629 | int ret = 0; | |
1630 | ||
6d2a620c | 1631 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1632 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1633 | <tng_fops, NULL); |
1634 | ||
255e52a4 | 1635 | if (!lttng_proc_dentry) { |
baf20995 MD |
1636 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1637 | ret = -ENOMEM; | |
1638 | goto error; | |
1639 | } | |
ed8d02d6 JD |
1640 | lttng_stream_override_ring_buffer_fops(); |
1641 | ||
baf20995 MD |
1642 | error: |
1643 | return ret; | |
1644 | } | |
1645 | ||
e6e65fcd MD |
1646 | /* No __exit annotation because used by init error path too. */ |
1647 | void lttng_abi_exit(void) | |
baf20995 | 1648 | { |
e6a17f26 MD |
1649 | if (lttng_proc_dentry) |
1650 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1651 | } |