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" |
4ce9f32b | 53 | #include "wrapper/kref.h" |
e8951e63 | 54 | #include "lttng-abi.h" |
6dccd6c1 | 55 | #include "lttng-abi-old.h" |
a90917c3 MD |
56 | #include "lttng-events.h" |
57 | #include "lttng-tracer.h" | |
3b731ab1 | 58 | #include "lib/ringbuffer/frontend_types.h" |
baf20995 MD |
59 | |
60 | /* | |
61 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 62 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
63 | */ |
64 | ||
e6a17f26 | 65 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
66 | static const struct file_operations lttng_fops; |
67 | static const struct file_operations lttng_session_fops; | |
68 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 69 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 70 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 71 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 72 | |
a33c9927 MD |
73 | /* |
74 | * Teardown management: opened file descriptors keep a refcount on the module, | |
75 | * so it can only exit when all file descriptors are closed. | |
76 | */ | |
77 | ||
ad1c05e1 | 78 | static |
baf20995 MD |
79 | int lttng_abi_create_session(void) |
80 | { | |
a90917c3 | 81 | struct lttng_session *session; |
c0e31d2e | 82 | struct file *session_file; |
11b5a3c2 | 83 | int session_fd, ret; |
baf20995 | 84 | |
a90917c3 | 85 | session = lttng_session_create(); |
baf20995 MD |
86 | if (!session) |
87 | return -ENOMEM; | |
4ac10b76 | 88 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
89 | if (session_fd < 0) { |
90 | ret = session_fd; | |
91 | goto fd_error; | |
92 | } | |
c0e31d2e | 93 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 94 | <tng_session_fops, |
baf20995 | 95 | session, O_RDWR); |
c0e31d2e MD |
96 | if (IS_ERR(session_file)) { |
97 | ret = PTR_ERR(session_file); | |
baf20995 MD |
98 | goto file_error; |
99 | } | |
c0e31d2e MD |
100 | session->file = session_file; |
101 | fd_install(session_fd, session_file); | |
baf20995 MD |
102 | return session_fd; |
103 | ||
104 | file_error: | |
105 | put_unused_fd(session_fd); | |
106 | fd_error: | |
a90917c3 | 107 | lttng_session_destroy(session); |
baf20995 MD |
108 | return ret; |
109 | } | |
110 | ||
271b6681 MD |
111 | static |
112 | int lttng_abi_tracepoint_list(void) | |
113 | { | |
114 | struct file *tracepoint_list_file; | |
115 | int file_fd, ret; | |
116 | ||
4ac10b76 | 117 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
118 | if (file_fd < 0) { |
119 | ret = file_fd; | |
120 | goto fd_error; | |
121 | } | |
30f18bf0 | 122 | |
8ee099b6 | 123 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
124 | <tng_tracepoint_list_fops, |
125 | NULL, O_RDWR); | |
126 | if (IS_ERR(tracepoint_list_file)) { | |
127 | ret = PTR_ERR(tracepoint_list_file); | |
128 | goto file_error; | |
129 | } | |
30f18bf0 MD |
130 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
131 | if (ret < 0) | |
132 | goto open_error; | |
271b6681 MD |
133 | fd_install(file_fd, tracepoint_list_file); |
134 | return file_fd; | |
135 | ||
30f18bf0 MD |
136 | open_error: |
137 | fput(tracepoint_list_file); | |
271b6681 MD |
138 | file_error: |
139 | put_unused_fd(file_fd); | |
140 | fd_error: | |
141 | return ret; | |
142 | } | |
143 | ||
f127e61e MD |
144 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
145 | static inline | |
146 | int lttng_abi_syscall_list(void) | |
147 | { | |
148 | return -ENOSYS; | |
149 | } | |
150 | #else | |
151 | static | |
152 | int lttng_abi_syscall_list(void) | |
153 | { | |
154 | struct file *syscall_list_file; | |
155 | int file_fd, ret; | |
156 | ||
157 | file_fd = lttng_get_unused_fd(); | |
158 | if (file_fd < 0) { | |
159 | ret = file_fd; | |
160 | goto fd_error; | |
161 | } | |
162 | ||
163 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
164 | <tng_syscall_list_fops, | |
165 | NULL, O_RDWR); | |
166 | if (IS_ERR(syscall_list_file)) { | |
167 | ret = PTR_ERR(syscall_list_file); | |
168 | goto file_error; | |
169 | } | |
170 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
171 | if (ret < 0) | |
172 | goto open_error; | |
173 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
174 | return file_fd; |
175 | ||
176 | open_error: | |
177 | fput(syscall_list_file); | |
178 | file_error: | |
179 | put_unused_fd(file_fd); | |
180 | fd_error: | |
181 | return ret; | |
182 | } | |
183 | #endif | |
184 | ||
80c16bcf | 185 | static |
6dccd6c1 | 186 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 187 | { |
6dccd6c1 JD |
188 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
189 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
190 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
191 | } |
192 | ||
42cabb80 MD |
193 | static |
194 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
195 | { | |
196 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
197 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
198 | } | |
199 | ||
8070f5c0 MD |
200 | static |
201 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 202 | struct lttng_kernel_context *context_param, |
a90917c3 | 203 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 204 | { |
8070f5c0 MD |
205 | |
206 | if (session->been_active) | |
207 | return -EPERM; | |
208 | ||
6dccd6c1 | 209 | switch (context_param->ctx) { |
12a313a5 | 210 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 211 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
212 | case LTTNG_KERNEL_CONTEXT_PRIO: |
213 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
214 | case LTTNG_KERNEL_CONTEXT_NICE: |
215 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
216 | case LTTNG_KERNEL_CONTEXT_VPID: |
217 | return lttng_add_vpid_to_ctx(ctx); | |
218 | case LTTNG_KERNEL_CONTEXT_TID: | |
219 | return lttng_add_tid_to_ctx(ctx); | |
220 | case LTTNG_KERNEL_CONTEXT_VTID: | |
221 | return lttng_add_vtid_to_ctx(ctx); | |
222 | case LTTNG_KERNEL_CONTEXT_PPID: | |
223 | return lttng_add_ppid_to_ctx(ctx); | |
224 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
225 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 226 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
227 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
228 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
229 | context_param->u.perf_counter.config, | |
230 | context_param->u.perf_counter.name, | |
c24a0d71 | 231 | ctx); |
a2563e83 MD |
232 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
233 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
234 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
235 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
236 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
237 | return lttng_add_cpu_id_to_ctx(ctx); | |
8070f5c0 MD |
238 | default: |
239 | return -EINVAL; | |
240 | } | |
241 | } | |
242 | ||
ad1c05e1 MD |
243 | /** |
244 | * lttng_ioctl - lttng syscall through ioctl | |
245 | * | |
c0e31d2e | 246 | * @file: the file |
ad1c05e1 MD |
247 | * @cmd: the command |
248 | * @arg: command arg | |
249 | * | |
250 | * This ioctl implements lttng commands: | |
38d024ae | 251 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 252 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
253 | * LTTNG_KERNEL_TRACER_VERSION |
254 | * Returns the LTTng kernel tracer version | |
255 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
256 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
257 | * LTTNG_KERNEL_WAIT_QUIESCENT |
258 | * Returns after all previously running probes have completed | |
42cabb80 MD |
259 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
260 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
261 | * |
262 | * The returned session will be deleted when its file descriptor is closed. | |
263 | */ | |
264 | static | |
c0e31d2e | 265 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
266 | { |
267 | switch (cmd) { | |
6dccd6c1 | 268 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 269 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 270 | return lttng_abi_create_session(); |
6dccd6c1 JD |
271 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
272 | { | |
273 | struct lttng_kernel_tracer_version v; | |
274 | struct lttng_kernel_old_tracer_version oldv; | |
275 | struct lttng_kernel_old_tracer_version *uversion = | |
276 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
277 | ||
278 | lttng_abi_tracer_version(&v); | |
279 | oldv.major = v.major; | |
280 | oldv.minor = v.minor; | |
281 | oldv.patchlevel = v.patchlevel; | |
282 | ||
283 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
284 | return -EFAULT; | |
285 | return 0; | |
286 | } | |
80c16bcf | 287 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
288 | { |
289 | struct lttng_kernel_tracer_version version; | |
290 | struct lttng_kernel_tracer_version *uversion = | |
291 | (struct lttng_kernel_tracer_version __user *) arg; | |
292 | ||
293 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
294 | |
295 | if (copy_to_user(uversion, &version, sizeof(version))) | |
296 | return -EFAULT; | |
297 | return 0; | |
298 | } | |
299 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
300 | { | |
301 | struct lttng_kernel_tracer_abi_version version; | |
302 | struct lttng_kernel_tracer_abi_version *uversion = | |
303 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
304 | ||
305 | lttng_abi_tracer_abi_version(&version); | |
306 | ||
6dccd6c1 JD |
307 | if (copy_to_user(uversion, &version, sizeof(version))) |
308 | return -EFAULT; | |
309 | return 0; | |
310 | } | |
311 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
312 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
313 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
314 | case LTTNG_KERNEL_SYSCALL_LIST: |
315 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 316 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
317 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
318 | synchronize_trace(); | |
319 | return 0; | |
6dccd6c1 JD |
320 | case LTTNG_KERNEL_OLD_CALIBRATE: |
321 | { | |
322 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
323 | (struct lttng_kernel_old_calibrate __user *) arg; | |
324 | struct lttng_kernel_old_calibrate old_calibrate; | |
325 | struct lttng_kernel_calibrate calibrate; | |
326 | int ret; | |
327 | ||
328 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
329 | return -EFAULT; | |
330 | calibrate.type = old_calibrate.type; | |
331 | ret = lttng_calibrate(&calibrate); | |
332 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
333 | return -EFAULT; | |
334 | return ret; | |
335 | } | |
57105fc2 MD |
336 | case LTTNG_KERNEL_CALIBRATE: |
337 | { | |
3db41b2c MD |
338 | struct lttng_kernel_calibrate __user *ucalibrate = |
339 | (struct lttng_kernel_calibrate __user *) arg; | |
340 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
341 | int ret; |
342 | ||
343 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
344 | return -EFAULT; | |
345 | ret = lttng_calibrate(&calibrate); | |
346 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
347 | return -EFAULT; | |
348 | return ret; | |
349 | } | |
ad1c05e1 MD |
350 | default: |
351 | return -ENOIOCTLCMD; | |
352 | } | |
353 | } | |
354 | ||
ad1c05e1 | 355 | static const struct file_operations lttng_fops = { |
a33c9927 | 356 | .owner = THIS_MODULE, |
ad1c05e1 MD |
357 | .unlocked_ioctl = lttng_ioctl, |
358 | #ifdef CONFIG_COMPAT | |
03037b98 | 359 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 360 | #endif |
11b5a3c2 | 361 | }; |
ad1c05e1 | 362 | |
5dbbdb43 | 363 | static |
c0e31d2e | 364 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 365 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 366 | enum channel_type channel_type) |
baf20995 | 367 | { |
a90917c3 | 368 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 369 | const struct file_operations *fops = NULL; |
5dbbdb43 | 370 | const char *transport_name; |
a90917c3 | 371 | struct lttng_channel *chan; |
c0e31d2e | 372 | struct file *chan_file; |
baf20995 | 373 | int chan_fd; |
ad1c05e1 | 374 | int ret = 0; |
baf20995 | 375 | |
4ac10b76 | 376 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
377 | if (chan_fd < 0) { |
378 | ret = chan_fd; | |
379 | goto fd_error; | |
380 | } | |
88dfd899 MD |
381 | switch (channel_type) { |
382 | case PER_CPU_CHANNEL: | |
383 | fops = <tng_channel_fops; | |
384 | break; | |
385 | case METADATA_CHANNEL: | |
386 | fops = <tng_metadata_fops; | |
387 | break; | |
388 | } | |
389 | ||
c0e31d2e | 390 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 391 | fops, |
03037b98 | 392 | NULL, O_RDWR); |
c0e31d2e MD |
393 | if (IS_ERR(chan_file)) { |
394 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
395 | goto file_error; |
396 | } | |
5dbbdb43 MD |
397 | switch (channel_type) { |
398 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
399 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
400 | transport_name = chan_param->overwrite ? | |
96ba7208 | 401 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
402 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
403 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
404 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
405 | } else { | |
406 | return -EINVAL; | |
407 | } | |
5dbbdb43 | 408 | break; |
5dbbdb43 | 409 | case METADATA_CHANNEL: |
6dccd6c1 | 410 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 411 | transport_name = "relay-metadata"; |
6dccd6c1 | 412 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
413 | transport_name = "relay-metadata-mmap"; |
414 | else | |
415 | return -EINVAL; | |
5dbbdb43 MD |
416 | break; |
417 | default: | |
418 | transport_name = "<unknown>"; | |
419 | break; | |
420 | } | |
4ce9f32b MD |
421 | if (atomic_long_add_unless(&session_file->f_count, |
422 | 1, INT_MAX) == INT_MAX) { | |
423 | goto refcount_error; | |
424 | } | |
03037b98 MD |
425 | /* |
426 | * We tolerate no failure path after channel creation. It will stay | |
427 | * invariant for the rest of the session. | |
428 | */ | |
a90917c3 | 429 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
430 | chan_param->subbuf_size, |
431 | chan_param->num_subbuf, | |
432 | chan_param->switch_timer_interval, | |
d83004aa JD |
433 | chan_param->read_timer_interval, |
434 | channel_type); | |
03037b98 | 435 | if (!chan) { |
f3d01b96 | 436 | ret = -EINVAL; |
03037b98 MD |
437 | goto chan_error; |
438 | } | |
11b5a3c2 | 439 | chan->file = chan_file; |
c0e31d2e MD |
440 | chan_file->private_data = chan; |
441 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 442 | |
baf20995 MD |
443 | return chan_fd; |
444 | ||
03037b98 | 445 | chan_error: |
4ce9f32b MD |
446 | atomic_long_dec(&session_file->f_count); |
447 | refcount_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 | ||
92d9f5e6 | 623 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 624 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 625 | stream->metadata_out) |
d83004aa | 626 | mask |= POLLIN; |
92d9f5e6 | 627 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
628 | } |
629 | ||
630 | return mask; | |
631 | } | |
632 | ||
f613e3e6 MD |
633 | static |
634 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
635 | unsigned int cmd, unsigned long arg) | |
636 | { | |
637 | struct lttng_metadata_stream *stream = filp->private_data; | |
638 | ||
639 | stream->metadata_out = stream->metadata_in; | |
640 | } | |
641 | ||
d83004aa JD |
642 | static |
643 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
644 | unsigned int cmd, unsigned long arg) | |
645 | { | |
646 | int ret; | |
647 | struct lttng_metadata_stream *stream = filp->private_data; | |
648 | struct lib_ring_buffer *buf = stream->priv; | |
649 | ||
650 | switch (cmd) { | |
d83004aa JD |
651 | case RING_BUFFER_GET_NEXT_SUBBUF: |
652 | { | |
35097f36 JD |
653 | struct lttng_metadata_stream *stream = filp->private_data; |
654 | struct lib_ring_buffer *buf = stream->priv; | |
655 | struct channel *chan = buf->backend.chan; | |
656 | ||
657 | ret = lttng_metadata_output_channel(stream, chan); | |
658 | if (ret > 0) { | |
659 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
660 | ret = 0; | |
661 | } else if (ret < 0) | |
d83004aa JD |
662 | goto err; |
663 | break; | |
664 | } | |
f613e3e6 MD |
665 | case RING_BUFFER_GET_SUBBUF: |
666 | { | |
667 | /* | |
668 | * Random access is not allowed for metadata channel. | |
669 | */ | |
670 | return -ENOSYS; | |
671 | } | |
35097f36 JD |
672 | case RING_BUFFER_FLUSH: |
673 | { | |
674 | struct lttng_metadata_stream *stream = filp->private_data; | |
675 | struct lib_ring_buffer *buf = stream->priv; | |
676 | struct channel *chan = buf->backend.chan; | |
677 | ||
678 | /* | |
679 | * Before doing the actual ring buffer flush, write up to one | |
680 | * packet of metadata in the ring buffer. | |
681 | */ | |
682 | ret = lttng_metadata_output_channel(stream, chan); | |
683 | if (ret < 0) | |
684 | goto err; | |
685 | break; | |
686 | } | |
d83004aa JD |
687 | default: |
688 | break; | |
689 | } | |
f613e3e6 MD |
690 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
691 | ||
d83004aa | 692 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
693 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
694 | if (ret < 0) | |
695 | goto err; | |
d83004aa | 696 | |
f613e3e6 MD |
697 | switch (cmd) { |
698 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
699 | { | |
700 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
701 | cmd, arg); | |
702 | break; | |
703 | } | |
704 | default: | |
705 | break; | |
706 | } | |
d83004aa JD |
707 | err: |
708 | return ret; | |
709 | } | |
710 | ||
aeb9064d | 711 | #ifdef CONFIG_COMPAT |
d83004aa JD |
712 | static |
713 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
714 | unsigned int cmd, unsigned long arg) | |
715 | { | |
716 | int ret; | |
717 | struct lttng_metadata_stream *stream = filp->private_data; | |
718 | struct lib_ring_buffer *buf = stream->priv; | |
719 | ||
720 | switch (cmd) { | |
d83004aa JD |
721 | case RING_BUFFER_GET_NEXT_SUBBUF: |
722 | { | |
35097f36 JD |
723 | struct lttng_metadata_stream *stream = filp->private_data; |
724 | struct lib_ring_buffer *buf = stream->priv; | |
725 | struct channel *chan = buf->backend.chan; | |
726 | ||
727 | ret = lttng_metadata_output_channel(stream, chan); | |
728 | if (ret > 0) { | |
729 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
730 | ret = 0; | |
731 | } else if (ret < 0) | |
d83004aa JD |
732 | goto err; |
733 | break; | |
734 | } | |
f613e3e6 MD |
735 | case RING_BUFFER_GET_SUBBUF: |
736 | { | |
737 | /* | |
738 | * Random access is not allowed for metadata channel. | |
739 | */ | |
740 | return -ENOSYS; | |
741 | } | |
b96080a0 MD |
742 | case RING_BUFFER_FLUSH: |
743 | { | |
744 | struct lttng_metadata_stream *stream = filp->private_data; | |
745 | struct lib_ring_buffer *buf = stream->priv; | |
746 | struct channel *chan = buf->backend.chan; | |
747 | ||
748 | /* | |
749 | * Before doing the actual ring buffer flush, write up to one | |
750 | * packet of metadata in the ring buffer. | |
751 | */ | |
752 | ret = lttng_metadata_output_channel(stream, chan); | |
753 | if (ret < 0) | |
754 | goto err; | |
755 | break; | |
756 | } | |
d83004aa JD |
757 | default: |
758 | break; | |
759 | } | |
f613e3e6 MD |
760 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
761 | ||
d83004aa | 762 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
763 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
764 | if (ret < 0) | |
765 | goto err; | |
d83004aa | 766 | |
f613e3e6 MD |
767 | switch (cmd) { |
768 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
769 | { | |
770 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
771 | cmd, arg); | |
772 | break; | |
773 | } | |
774 | default: | |
775 | break; | |
776 | } | |
d83004aa JD |
777 | err: |
778 | return ret; | |
779 | } | |
aeb9064d | 780 | #endif |
d83004aa | 781 | |
b3b8072b MD |
782 | /* |
783 | * This is not used by anonymous file descriptors. This code is left | |
784 | * there if we ever want to implement an inode with open() operation. | |
785 | */ | |
d83004aa JD |
786 | static |
787 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
788 | { | |
789 | struct lttng_metadata_stream *stream = inode->i_private; | |
790 | struct lib_ring_buffer *buf = stream->priv; | |
791 | ||
792 | file->private_data = buf; | |
b3b8072b MD |
793 | /* |
794 | * Since life-time of metadata cache differs from that of | |
795 | * session, we need to keep our own reference on the transport. | |
796 | */ | |
797 | if (!try_module_get(stream->transport->owner)) { | |
798 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
799 | return -EBUSY; | |
800 | } | |
d83004aa JD |
801 | return lib_ring_buffer_open(inode, file, buf); |
802 | } | |
803 | ||
804 | static | |
805 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
806 | { | |
807 | struct lttng_metadata_stream *stream = file->private_data; | |
808 | struct lib_ring_buffer *buf = stream->priv; | |
809 | ||
810 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 811 | module_put(stream->transport->owner); |
d83004aa JD |
812 | return lib_ring_buffer_release(inode, file, buf); |
813 | } | |
814 | ||
815 | static | |
816 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
817 | struct pipe_inode_info *pipe, size_t len, | |
818 | unsigned int flags) | |
819 | { | |
820 | struct lttng_metadata_stream *stream = in->private_data; | |
821 | struct lib_ring_buffer *buf = stream->priv; | |
822 | ||
823 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
824 | flags, buf); | |
825 | } | |
826 | ||
827 | static | |
828 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
829 | struct vm_area_struct *vma) | |
830 | { | |
831 | struct lttng_metadata_stream *stream = filp->private_data; | |
832 | struct lib_ring_buffer *buf = stream->priv; | |
833 | ||
834 | return lib_ring_buffer_mmap(filp, vma, buf); | |
835 | } | |
836 | ||
837 | static | |
838 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
839 | .owner = THIS_MODULE, | |
840 | .open = lttng_metadata_ring_buffer_open, | |
841 | .release = lttng_metadata_ring_buffer_release, | |
842 | .poll = lttng_metadata_ring_buffer_poll, | |
843 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
844 | .mmap = lttng_metadata_ring_buffer_mmap, | |
845 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
846 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
847 | #ifdef CONFIG_COMPAT | |
848 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
849 | #endif | |
850 | }; | |
851 | ||
852 | static | |
853 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
854 | const struct file_operations *fops) | |
ad1c05e1 | 855 | { |
ad1c05e1 | 856 | int stream_fd, ret; |
11b5a3c2 | 857 | struct file *stream_file; |
ad1c05e1 | 858 | |
4ac10b76 | 859 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
860 | if (stream_fd < 0) { |
861 | ret = stream_fd; | |
862 | goto fd_error; | |
863 | } | |
d83004aa JD |
864 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
865 | stream_priv, O_RDWR); | |
c0e31d2e MD |
866 | if (IS_ERR(stream_file)) { |
867 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
868 | goto file_error; |
869 | } | |
409453cb MD |
870 | /* |
871 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
872 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
873 | * file descriptor, so we set FMODE_PREAD here. | |
874 | */ | |
d7b6f197 | 875 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 876 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
877 | /* |
878 | * The stream holds a reference to the channel within the generic ring | |
879 | * buffer library, so no need to hold a refcount on the channel and | |
880 | * session files here. | |
881 | */ | |
ad1c05e1 MD |
882 | return stream_fd; |
883 | ||
884 | file_error: | |
885 | put_unused_fd(stream_fd); | |
d83004aa JD |
886 | fd_error: |
887 | return ret; | |
888 | } | |
889 | ||
890 | static | |
891 | int lttng_abi_open_stream(struct file *channel_file) | |
892 | { | |
893 | struct lttng_channel *channel = channel_file->private_data; | |
894 | struct lib_ring_buffer *buf; | |
895 | int ret; | |
896 | void *stream_priv; | |
897 | ||
898 | buf = channel->ops->buffer_read_open(channel->chan); | |
899 | if (!buf) | |
900 | return -ENOENT; | |
901 | ||
902 | stream_priv = buf; | |
903 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 904 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
905 | if (ret < 0) |
906 | goto fd_error; | |
907 | ||
908 | return ret; | |
909 | ||
910 | fd_error: | |
911 | channel->ops->buffer_read_close(buf); | |
912 | return ret; | |
913 | } | |
914 | ||
915 | static | |
916 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
917 | { | |
918 | struct lttng_channel *channel = channel_file->private_data; | |
919 | struct lttng_session *session = channel->session; | |
920 | struct lib_ring_buffer *buf; | |
921 | int ret; | |
922 | struct lttng_metadata_stream *metadata_stream; | |
923 | void *stream_priv; | |
924 | ||
925 | buf = channel->ops->buffer_read_open(channel->chan); | |
926 | if (!buf) | |
927 | return -ENOENT; | |
928 | ||
929 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
930 | GFP_KERNEL); | |
b3b8072b MD |
931 | if (!metadata_stream) { |
932 | ret = -ENOMEM; | |
933 | goto nomem; | |
934 | } | |
d83004aa JD |
935 | metadata_stream->metadata_cache = session->metadata_cache; |
936 | init_waitqueue_head(&metadata_stream->read_wait); | |
937 | metadata_stream->priv = buf; | |
938 | stream_priv = metadata_stream; | |
b3b8072b MD |
939 | metadata_stream->transport = channel->transport; |
940 | ||
941 | /* | |
942 | * Since life-time of metadata cache differs from that of | |
943 | * session, we need to keep our own reference on the transport. | |
944 | */ | |
945 | if (!try_module_get(metadata_stream->transport->owner)) { | |
946 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
947 | ret = -EINVAL; | |
948 | goto notransport; | |
949 | } | |
950 | ||
4ce9f32b MD |
951 | if (!lttng_kref_get(&session->metadata_cache->refcount)) |
952 | goto kref_error; | |
d83004aa JD |
953 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
954 | <tng_metadata_ring_buffer_file_operations); | |
955 | if (ret < 0) | |
956 | goto fd_error; | |
957 | ||
d83004aa JD |
958 | list_add(&metadata_stream->list, |
959 | &session->metadata_cache->metadata_stream); | |
960 | return ret; | |
961 | ||
ad1c05e1 | 962 | fd_error: |
4ce9f32b MD |
963 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
964 | kref_error: | |
b3b8072b MD |
965 | module_put(metadata_stream->transport->owner); |
966 | notransport: | |
967 | kfree(metadata_stream); | |
968 | nomem: | |
11b5a3c2 | 969 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
970 | return ret; |
971 | } | |
972 | ||
653fe716 | 973 | static |
c0e31d2e | 974 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 975 | struct lttng_kernel_event *event_param) |
653fe716 | 976 | { |
a90917c3 | 977 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 978 | int event_fd, ret; |
11b5a3c2 | 979 | struct file *event_file; |
3c997079 | 980 | void *priv; |
653fe716 | 981 | |
6dccd6c1 JD |
982 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
983 | switch (event_param->instrumentation) { | |
7371f44c | 984 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 985 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 986 | break; |
ab2277d6 | 987 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 988 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 989 | break; |
ab2277d6 | 990 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 991 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
992 | break; |
993 | default: | |
994 | break; | |
995 | } | |
33a39a3c MD |
996 | event_fd = lttng_get_unused_fd(); |
997 | if (event_fd < 0) { | |
998 | ret = event_fd; | |
999 | goto fd_error; | |
1000 | } | |
1001 | event_file = anon_inode_getfile("[lttng_event]", | |
1002 | <tng_event_fops, | |
1003 | NULL, O_RDWR); | |
1004 | if (IS_ERR(event_file)) { | |
1005 | ret = PTR_ERR(event_file); | |
1006 | goto file_error; | |
1007 | } | |
4ce9f32b MD |
1008 | /* The event holds a reference on the channel */ |
1009 | if (atomic_long_add_unless(&channel_file->f_count, | |
1010 | 1, INT_MAX) == INT_MAX) { | |
ada2ea9b | 1011 | ret = -EOVERFLOW; |
4ce9f32b MD |
1012 | goto refcount_error; |
1013 | } | |
33a39a3c MD |
1014 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1015 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1016 | struct lttng_enabler *enabler; | |
1017 | ||
1018 | if (event_param->name[strlen(event_param->name) - 1] == '*') { | |
1019 | enabler = lttng_enabler_create(LTTNG_ENABLER_WILDCARD, | |
1020 | event_param, channel); | |
3c997079 | 1021 | } else { |
33a39a3c MD |
1022 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1023 | event_param, channel); | |
1ec65de1 | 1024 | } |
33a39a3c MD |
1025 | priv = enabler; |
1026 | } else { | |
1027 | struct lttng_event *event; | |
4ee2453d | 1028 | |
33a39a3c MD |
1029 | /* |
1030 | * We tolerate no failure path after event creation. It | |
1031 | * will stay invariant for the rest of the session. | |
1032 | */ | |
1033 | event = lttng_event_create(channel, event_param, | |
1034 | NULL, NULL, | |
1035 | event_param->instrumentation); | |
1036 | WARN_ON_ONCE(!event); | |
1037 | if (IS_ERR(event)) { | |
1038 | ret = PTR_ERR(event); | |
1039 | goto event_error; | |
80f87dd2 | 1040 | } |
33a39a3c | 1041 | priv = event; |
03037b98 | 1042 | } |
33a39a3c MD |
1043 | event_file->private_data = priv; |
1044 | fd_install(event_fd, event_file); | |
653fe716 MD |
1045 | return event_fd; |
1046 | ||
03037b98 | 1047 | event_error: |
4ce9f32b MD |
1048 | atomic_long_dec(&channel_file->f_count); |
1049 | refcount_error: | |
c0e31d2e | 1050 | fput(event_file); |
653fe716 MD |
1051 | file_error: |
1052 | put_unused_fd(event_fd); | |
1053 | fd_error: | |
653fe716 MD |
1054 | return ret; |
1055 | } | |
ad1c05e1 MD |
1056 | |
1057 | /** | |
1058 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1059 | * | |
c0e31d2e | 1060 | * @file: the file |
ad1c05e1 MD |
1061 | * @cmd: the command |
1062 | * @arg: command arg | |
1063 | * | |
1064 | * This ioctl implements lttng commands: | |
38d024ae | 1065 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1066 | * Returns an event stream file descriptor or failure. |
1067 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1068 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1069 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1070 | * LTTNG_KERNEL_CONTEXT |
1071 | * Prepend a context field to each event in the channel | |
e64957da MD |
1072 | * LTTNG_KERNEL_ENABLE |
1073 | * Enable recording for events in this channel (weak enable) | |
1074 | * LTTNG_KERNEL_DISABLE | |
1075 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1076 | * |
baf20995 MD |
1077 | * Channel and event file descriptors also hold a reference on the session. |
1078 | */ | |
ad1c05e1 | 1079 | static |
c0e31d2e | 1080 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1081 | { |
a90917c3 | 1082 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1083 | |
baf20995 | 1084 | switch (cmd) { |
6dccd6c1 | 1085 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1086 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1087 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1088 | case LTTNG_KERNEL_OLD_EVENT: |
1089 | { | |
1090 | struct lttng_kernel_event *uevent_param; | |
1091 | struct lttng_kernel_old_event *old_uevent_param; | |
1092 | int ret; | |
1093 | ||
1094 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1095 | GFP_KERNEL); | |
1096 | if (!uevent_param) { | |
1097 | ret = -ENOMEM; | |
1098 | goto old_event_end; | |
1099 | } | |
1100 | old_uevent_param = kmalloc( | |
1101 | sizeof(struct lttng_kernel_old_event), | |
1102 | GFP_KERNEL); | |
1103 | if (!old_uevent_param) { | |
1104 | ret = -ENOMEM; | |
1105 | goto old_event_error_free_param; | |
1106 | } | |
1107 | if (copy_from_user(old_uevent_param, | |
1108 | (struct lttng_kernel_old_event __user *) arg, | |
1109 | sizeof(struct lttng_kernel_old_event))) { | |
1110 | ret = -EFAULT; | |
1111 | goto old_event_error_free_old_param; | |
1112 | } | |
1113 | ||
1114 | memcpy(uevent_param->name, old_uevent_param->name, | |
1115 | sizeof(uevent_param->name)); | |
1116 | uevent_param->instrumentation = | |
1117 | old_uevent_param->instrumentation; | |
1118 | ||
1119 | switch (old_uevent_param->instrumentation) { | |
1120 | case LTTNG_KERNEL_KPROBE: | |
1121 | uevent_param->u.kprobe.addr = | |
1122 | old_uevent_param->u.kprobe.addr; | |
1123 | uevent_param->u.kprobe.offset = | |
1124 | old_uevent_param->u.kprobe.offset; | |
1125 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1126 | old_uevent_param->u.kprobe.symbol_name, | |
1127 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1128 | break; | |
1129 | case LTTNG_KERNEL_KRETPROBE: | |
1130 | uevent_param->u.kretprobe.addr = | |
1131 | old_uevent_param->u.kretprobe.addr; | |
1132 | uevent_param->u.kretprobe.offset = | |
1133 | old_uevent_param->u.kretprobe.offset; | |
1134 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1135 | old_uevent_param->u.kretprobe.symbol_name, | |
1136 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1137 | break; | |
1138 | case LTTNG_KERNEL_FUNCTION: | |
1139 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1140 | old_uevent_param->u.ftrace.symbol_name, | |
1141 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1142 | break; | |
1143 | default: | |
1144 | break; | |
1145 | } | |
1146 | ret = lttng_abi_create_event(file, uevent_param); | |
1147 | ||
1148 | old_event_error_free_old_param: | |
1149 | kfree(old_uevent_param); | |
1150 | old_event_error_free_param: | |
1151 | kfree(uevent_param); | |
1152 | old_event_end: | |
1153 | return ret; | |
1154 | } | |
38d024ae | 1155 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1156 | { |
1157 | struct lttng_kernel_event uevent_param; | |
1158 | ||
1159 | if (copy_from_user(&uevent_param, | |
1160 | (struct lttng_kernel_event __user *) arg, | |
1161 | sizeof(uevent_param))) | |
1162 | return -EFAULT; | |
1163 | return lttng_abi_create_event(file, &uevent_param); | |
1164 | } | |
1165 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1166 | { | |
1167 | struct lttng_kernel_context *ucontext_param; | |
1168 | struct lttng_kernel_old_context *old_ucontext_param; | |
1169 | int ret; | |
1170 | ||
1171 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1172 | GFP_KERNEL); | |
1173 | if (!ucontext_param) { | |
1174 | ret = -ENOMEM; | |
1175 | goto old_ctx_end; | |
1176 | } | |
1177 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1178 | GFP_KERNEL); | |
1179 | if (!old_ucontext_param) { | |
1180 | ret = -ENOMEM; | |
1181 | goto old_ctx_error_free_param; | |
1182 | } | |
1183 | ||
1184 | if (copy_from_user(old_ucontext_param, | |
1185 | (struct lttng_kernel_old_context __user *) arg, | |
1186 | sizeof(struct lttng_kernel_old_context))) { | |
1187 | ret = -EFAULT; | |
1188 | goto old_ctx_error_free_old_param; | |
1189 | } | |
1190 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1191 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1192 | sizeof(ucontext_param->padding)); | |
1193 | /* only type that uses the union */ | |
1194 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1195 | ucontext_param->u.perf_counter.type = | |
1196 | old_ucontext_param->u.perf_counter.type; | |
1197 | ucontext_param->u.perf_counter.config = | |
1198 | old_ucontext_param->u.perf_counter.config; | |
1199 | memcpy(ucontext_param->u.perf_counter.name, | |
1200 | old_ucontext_param->u.perf_counter.name, | |
1201 | sizeof(ucontext_param->u.perf_counter.name)); | |
1202 | } | |
1203 | ||
1204 | ret = lttng_abi_add_context(file, | |
1205 | ucontext_param, | |
1206 | &channel->ctx, channel->session); | |
1207 | ||
1208 | old_ctx_error_free_old_param: | |
1209 | kfree(old_ucontext_param); | |
1210 | old_ctx_error_free_param: | |
1211 | kfree(ucontext_param); | |
1212 | old_ctx_end: | |
1213 | return ret; | |
1214 | } | |
8070f5c0 | 1215 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1216 | { |
1217 | struct lttng_kernel_context ucontext_param; | |
1218 | ||
1219 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1220 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1221 | sizeof(ucontext_param))) |
1222 | return -EFAULT; | |
1223 | return lttng_abi_add_context(file, | |
1224 | &ucontext_param, | |
8070f5c0 | 1225 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1226 | } |
1227 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1228 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1229 | return lttng_channel_enable(channel); |
6dccd6c1 | 1230 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1231 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1232 | return lttng_channel_disable(channel); |
12e579db MD |
1233 | case LTTNG_KERNEL_SYSCALL_MASK: |
1234 | return lttng_channel_syscall_mask(channel, | |
1235 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1236 | default: |
1237 | return -ENOIOCTLCMD; | |
1238 | } | |
6dccd6c1 | 1239 | |
baf20995 MD |
1240 | } |
1241 | ||
5dbbdb43 MD |
1242 | /** |
1243 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1244 | * | |
1245 | * @file: the file | |
1246 | * @cmd: the command | |
1247 | * @arg: command arg | |
1248 | * | |
1249 | * This ioctl implements lttng commands: | |
38d024ae | 1250 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1251 | * Returns an event stream file descriptor or failure. |
1252 | * | |
1253 | * Channel and event file descriptors also hold a reference on the session. | |
1254 | */ | |
1255 | static | |
1256 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1257 | { | |
1258 | switch (cmd) { | |
6dccd6c1 | 1259 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1260 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1261 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1262 | default: |
1263 | return -ENOIOCTLCMD; | |
1264 | } | |
1265 | } | |
1266 | ||
653fe716 MD |
1267 | /** |
1268 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1269 | * | |
c0e31d2e | 1270 | * @file: the file |
653fe716 MD |
1271 | * @wait: poll table |
1272 | */ | |
c0e31d2e | 1273 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1274 | { |
a90917c3 | 1275 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1276 | unsigned int mask = 0; |
1277 | ||
c0e31d2e | 1278 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1279 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1280 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1281 | wait); | |
653fe716 | 1282 | |
254ec7bc MD |
1283 | if (channel->ops->is_disabled(channel->chan)) |
1284 | return POLLERR; | |
24cedcfe | 1285 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1286 | return POLLHUP; |
f71ecafa | 1287 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1288 | return POLLIN | POLLRDNORM; |
f71ecafa | 1289 | return 0; |
653fe716 MD |
1290 | } |
1291 | return mask; | |
1292 | ||
1293 | } | |
1294 | ||
0a84a57f MD |
1295 | static |
1296 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1297 | { | |
a90917c3 | 1298 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1299 | |
1300 | if (channel) | |
1301 | fput(channel->session->file); | |
0a84a57f MD |
1302 | return 0; |
1303 | } | |
1304 | ||
d83004aa JD |
1305 | static |
1306 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1307 | { | |
1308 | struct lttng_channel *channel = file->private_data; | |
1309 | ||
1310 | if (channel) { | |
d83004aa | 1311 | fput(channel->session->file); |
9adb2e22 | 1312 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1313 | } |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
ad1c05e1 | 1318 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1319 | .owner = THIS_MODULE, |
03037b98 | 1320 | .release = lttng_channel_release, |
653fe716 | 1321 | .poll = lttng_channel_poll, |
ad1c05e1 | 1322 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1323 | #ifdef CONFIG_COMPAT |
03037b98 | 1324 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1325 | #endif |
11b5a3c2 | 1326 | }; |
baf20995 | 1327 | |
5dbbdb43 | 1328 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1329 | .owner = THIS_MODULE, |
d83004aa | 1330 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1331 | .unlocked_ioctl = lttng_metadata_ioctl, |
1332 | #ifdef CONFIG_COMPAT | |
1333 | .compat_ioctl = lttng_metadata_ioctl, | |
1334 | #endif | |
1335 | }; | |
1336 | ||
8070f5c0 MD |
1337 | /** |
1338 | * lttng_event_ioctl - lttng syscall through ioctl | |
1339 | * | |
1340 | * @file: the file | |
1341 | * @cmd: the command | |
1342 | * @arg: command arg | |
1343 | * | |
1344 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1345 | * LTTNG_KERNEL_CONTEXT |
1346 | * Prepend a context field to each record of this event | |
e64957da MD |
1347 | * LTTNG_KERNEL_ENABLE |
1348 | * Enable recording for this event (weak enable) | |
1349 | * LTTNG_KERNEL_DISABLE | |
1350 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1351 | */ |
1352 | static | |
1353 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1354 | { | |
3c997079 MD |
1355 | struct lttng_event *event; |
1356 | struct lttng_enabler *enabler; | |
1357 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1358 | |
1359 | switch (cmd) { | |
6dccd6c1 JD |
1360 | case LTTNG_KERNEL_OLD_CONTEXT: |
1361 | { | |
3c997079 MD |
1362 | /* Not implemented */ |
1363 | return -ENOSYS; | |
6dccd6c1 | 1364 | } |
8070f5c0 | 1365 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1366 | { |
3c997079 MD |
1367 | /* Not implemented */ |
1368 | return -ENOSYS; | |
6dccd6c1 JD |
1369 | } |
1370 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1371 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1372 | switch (*evtype) { |
1373 | case LTTNG_TYPE_EVENT: | |
1374 | event = file->private_data; | |
1375 | return lttng_event_enable(event); | |
1376 | case LTTNG_TYPE_ENABLER: | |
1377 | enabler = file->private_data; | |
1378 | return lttng_enabler_enable(enabler); | |
1379 | default: | |
1380 | WARN_ON_ONCE(1); | |
1381 | return -ENOSYS; | |
1382 | } | |
6dccd6c1 | 1383 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1384 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1385 | switch (*evtype) { |
1386 | case LTTNG_TYPE_EVENT: | |
1387 | event = file->private_data; | |
1388 | return lttng_event_disable(event); | |
1389 | case LTTNG_TYPE_ENABLER: | |
1390 | enabler = file->private_data; | |
1391 | return lttng_enabler_disable(enabler); | |
1392 | default: | |
1393 | WARN_ON_ONCE(1); | |
1394 | return -ENOSYS; | |
1395 | } | |
07dfc1d0 MD |
1396 | case LTTNG_KERNEL_FILTER: |
1397 | switch (*evtype) { | |
1398 | case LTTNG_TYPE_EVENT: | |
1399 | return -EINVAL; | |
1400 | case LTTNG_TYPE_ENABLER: | |
1401 | { | |
1402 | enabler = file->private_data; | |
1403 | return lttng_enabler_attach_bytecode(enabler, | |
1404 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1405 | } | |
1406 | ||
1407 | } | |
8070f5c0 MD |
1408 | default: |
1409 | return -ENOIOCTLCMD; | |
1410 | } | |
1411 | } | |
1412 | ||
0a84a57f MD |
1413 | static |
1414 | int lttng_event_release(struct inode *inode, struct file *file) | |
1415 | { | |
3c997079 MD |
1416 | struct lttng_event *event; |
1417 | struct lttng_enabler *enabler; | |
1418 | enum lttng_event_type *evtype = file->private_data; | |
1419 | ||
1420 | if (!evtype) | |
1421 | return 0; | |
1422 | ||
1423 | switch (*evtype) { | |
1424 | case LTTNG_TYPE_EVENT: | |
1425 | event = file->private_data; | |
1426 | if (event) | |
1427 | fput(event->chan->file); | |
1428 | break; | |
1429 | case LTTNG_TYPE_ENABLER: | |
1430 | enabler = file->private_data; | |
1431 | if (enabler) | |
1432 | fput(enabler->chan->file); | |
1433 | break; | |
1434 | default: | |
1435 | WARN_ON_ONCE(1); | |
1436 | break; | |
1437 | } | |
c269fff4 | 1438 | |
0a84a57f MD |
1439 | return 0; |
1440 | } | |
1441 | ||
3b923e5b | 1442 | /* TODO: filter control ioctl */ |
0a84a57f | 1443 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1444 | .owner = THIS_MODULE, |
0a84a57f | 1445 | .release = lttng_event_release, |
8070f5c0 MD |
1446 | .unlocked_ioctl = lttng_event_ioctl, |
1447 | #ifdef CONFIG_COMPAT | |
1448 | .compat_ioctl = lttng_event_ioctl, | |
1449 | #endif | |
11b5a3c2 | 1450 | }; |
0a84a57f | 1451 | |
3b731ab1 JD |
1452 | static int put_u64(uint64_t val, unsigned long arg) |
1453 | { | |
1454 | return put_user(val, (uint64_t __user *) arg); | |
1455 | } | |
1456 | ||
ed8d02d6 JD |
1457 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1458 | unsigned int cmd, unsigned long arg) | |
1459 | { | |
3b731ab1 JD |
1460 | struct lib_ring_buffer *buf = filp->private_data; |
1461 | struct channel *chan = buf->backend.chan; | |
1462 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1463 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1464 | int ret; |
1465 | ||
1466 | if (atomic_read(&chan->record_disabled)) | |
1467 | return -EIO; | |
1468 | ||
ed8d02d6 | 1469 | switch (cmd) { |
3b731ab1 JD |
1470 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1471 | { | |
1472 | uint64_t ts; | |
1473 | ||
dd5a0db3 | 1474 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1475 | if (ret < 0) |
1476 | goto error; | |
1477 | return put_u64(ts, arg); | |
1478 | } | |
1479 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1480 | { | |
1481 | uint64_t ts; | |
1482 | ||
dd5a0db3 | 1483 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1484 | if (ret < 0) |
1485 | goto error; | |
1486 | return put_u64(ts, arg); | |
1487 | } | |
1488 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1489 | { | |
1490 | uint64_t ed; | |
1491 | ||
dd5a0db3 | 1492 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1493 | if (ret < 0) |
1494 | goto error; | |
1495 | return put_u64(ed, arg); | |
1496 | } | |
1497 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1498 | { | |
1499 | uint64_t cs; | |
1500 | ||
dd5a0db3 | 1501 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1502 | if (ret < 0) |
1503 | goto error; | |
1504 | return put_u64(cs, arg); | |
1505 | } | |
1506 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1507 | { | |
1508 | uint64_t ps; | |
1509 | ||
dd5a0db3 | 1510 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1511 | if (ret < 0) |
1512 | goto error; | |
1513 | return put_u64(ps, arg); | |
1514 | } | |
1515 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1516 | { | |
1517 | uint64_t si; | |
1518 | ||
dd5a0db3 | 1519 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1520 | if (ret < 0) |
1521 | goto error; | |
1522 | return put_u64(si, arg); | |
1523 | } | |
2348ca17 JD |
1524 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1525 | { | |
1526 | uint64_t ts; | |
1527 | ||
dd5a0db3 | 1528 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1529 | if (ret < 0) |
1530 | goto error; | |
1531 | return put_u64(ts, arg); | |
1532 | } | |
3b731ab1 JD |
1533 | default: |
1534 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1535 | cmd, arg); | |
ed8d02d6 | 1536 | } |
3b731ab1 JD |
1537 | |
1538 | error: | |
1539 | return -ENOSYS; | |
ed8d02d6 JD |
1540 | } |
1541 | ||
1542 | #ifdef CONFIG_COMPAT | |
1543 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1544 | unsigned int cmd, unsigned long arg) | |
1545 | { | |
3b731ab1 JD |
1546 | struct lib_ring_buffer *buf = filp->private_data; |
1547 | struct channel *chan = buf->backend.chan; | |
1548 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1549 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1550 | int ret; |
1551 | ||
1552 | if (atomic_read(&chan->record_disabled)) | |
1553 | return -EIO; | |
1554 | ||
ed8d02d6 | 1555 | switch (cmd) { |
3b731ab1 JD |
1556 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1557 | { | |
1558 | uint64_t ts; | |
1559 | ||
dd5a0db3 | 1560 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1561 | if (ret < 0) |
1562 | goto error; | |
1563 | return put_u64(ts, arg); | |
1564 | } | |
1565 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1566 | { | |
1567 | uint64_t ts; | |
1568 | ||
dd5a0db3 | 1569 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1570 | if (ret < 0) |
1571 | goto error; | |
1572 | return put_u64(ts, arg); | |
1573 | } | |
1574 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1575 | { | |
1576 | uint64_t ed; | |
1577 | ||
dd5a0db3 | 1578 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1579 | if (ret < 0) |
1580 | goto error; | |
1581 | return put_u64(ed, arg); | |
ed8d02d6 | 1582 | } |
3b731ab1 JD |
1583 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1584 | { | |
1585 | uint64_t cs; | |
1586 | ||
dd5a0db3 | 1587 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1588 | if (ret < 0) |
1589 | goto error; | |
1590 | return put_u64(cs, arg); | |
1591 | } | |
1592 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1593 | { | |
1594 | uint64_t ps; | |
1595 | ||
dd5a0db3 | 1596 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1597 | if (ret < 0) |
1598 | goto error; | |
1599 | return put_u64(ps, arg); | |
1600 | } | |
1601 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1602 | { | |
1603 | uint64_t si; | |
1604 | ||
dd5a0db3 | 1605 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1606 | if (ret < 0) |
1607 | goto error; | |
1608 | return put_u64(si, arg); | |
1609 | } | |
2348ca17 JD |
1610 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1611 | { | |
1612 | uint64_t ts; | |
1613 | ||
dd5a0db3 | 1614 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1615 | if (ret < 0) |
1616 | goto error; | |
1617 | return put_u64(ts, arg); | |
1618 | } | |
3b731ab1 JD |
1619 | default: |
1620 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1621 | cmd, arg); | |
1622 | } | |
1623 | ||
1624 | error: | |
1625 | return -ENOSYS; | |
ed8d02d6 JD |
1626 | } |
1627 | #endif /* CONFIG_COMPAT */ | |
1628 | ||
1629 | static void lttng_stream_override_ring_buffer_fops(void) | |
1630 | { | |
1631 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1632 | lttng_stream_ring_buffer_file_operations.open = | |
1633 | lib_ring_buffer_file_operations.open; | |
1634 | lttng_stream_ring_buffer_file_operations.release = | |
1635 | lib_ring_buffer_file_operations.release; | |
1636 | lttng_stream_ring_buffer_file_operations.poll = | |
1637 | lib_ring_buffer_file_operations.poll; | |
1638 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1639 | lib_ring_buffer_file_operations.splice_read; | |
1640 | lttng_stream_ring_buffer_file_operations.mmap = | |
1641 | lib_ring_buffer_file_operations.mmap; | |
1642 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1643 | lttng_stream_ring_buffer_ioctl; | |
1644 | lttng_stream_ring_buffer_file_operations.llseek = | |
1645 | lib_ring_buffer_file_operations.llseek; | |
1646 | #ifdef CONFIG_COMPAT | |
1647 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1648 | lttng_stream_ring_buffer_compat_ioctl; | |
1649 | #endif | |
1650 | } | |
1651 | ||
80996790 | 1652 | int __init lttng_abi_init(void) |
baf20995 MD |
1653 | { |
1654 | int ret = 0; | |
1655 | ||
6d2a620c | 1656 | wrapper_vmalloc_sync_all(); |
d29348f7 | 1657 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1658 | <tng_fops, NULL); |
1659 | ||
255e52a4 | 1660 | if (!lttng_proc_dentry) { |
baf20995 MD |
1661 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1662 | ret = -ENOMEM; | |
1663 | goto error; | |
1664 | } | |
ed8d02d6 JD |
1665 | lttng_stream_override_ring_buffer_fops(); |
1666 | ||
baf20995 MD |
1667 | error: |
1668 | return ret; | |
1669 | } | |
1670 | ||
e6e65fcd MD |
1671 | /* No __exit annotation because used by init error path too. */ |
1672 | void lttng_abi_exit(void) | |
baf20995 | 1673 | { |
e6a17f26 MD |
1674 | if (lttng_proc_dentry) |
1675 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1676 | } |