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> |
241ae9a8 MD |
47 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ |
48 | #include <wrapper/ringbuffer/vfs.h> | |
49 | #include <wrapper/ringbuffer/backend.h> | |
50 | #include <wrapper/ringbuffer/frontend.h> | |
51 | #include <wrapper/poll.h> | |
52 | #include <wrapper/file.h> | |
53 | #include <wrapper/kref.h> | |
4993071a | 54 | #include <lttng-string-utils.h> |
241ae9a8 MD |
55 | #include <lttng-abi.h> |
56 | #include <lttng-abi-old.h> | |
57 | #include <lttng-events.h> | |
58 | #include <lttng-tracer.h> | |
f771eda6 | 59 | #include <lttng-tp-mempool.h> |
241ae9a8 | 60 | #include <lib/ringbuffer/frontend_types.h> |
baf20995 MD |
61 | |
62 | /* | |
63 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 64 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
65 | */ |
66 | ||
e6a17f26 | 67 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
68 | static const struct file_operations lttng_fops; |
69 | static const struct file_operations lttng_session_fops; | |
70 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 71 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 72 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 73 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 74 | |
9616f0bf JD |
75 | static int put_u64(uint64_t val, unsigned long arg); |
76 | ||
a33c9927 MD |
77 | /* |
78 | * Teardown management: opened file descriptors keep a refcount on the module, | |
79 | * so it can only exit when all file descriptors are closed. | |
80 | */ | |
81 | ||
ad1c05e1 | 82 | static |
baf20995 MD |
83 | int lttng_abi_create_session(void) |
84 | { | |
a90917c3 | 85 | struct lttng_session *session; |
c0e31d2e | 86 | struct file *session_file; |
11b5a3c2 | 87 | int session_fd, ret; |
baf20995 | 88 | |
a90917c3 | 89 | session = lttng_session_create(); |
baf20995 MD |
90 | if (!session) |
91 | return -ENOMEM; | |
4ac10b76 | 92 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
93 | if (session_fd < 0) { |
94 | ret = session_fd; | |
95 | goto fd_error; | |
96 | } | |
c0e31d2e | 97 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 98 | <tng_session_fops, |
baf20995 | 99 | session, O_RDWR); |
c0e31d2e MD |
100 | if (IS_ERR(session_file)) { |
101 | ret = PTR_ERR(session_file); | |
baf20995 MD |
102 | goto file_error; |
103 | } | |
c0e31d2e MD |
104 | session->file = session_file; |
105 | fd_install(session_fd, session_file); | |
baf20995 MD |
106 | return session_fd; |
107 | ||
108 | file_error: | |
109 | put_unused_fd(session_fd); | |
110 | fd_error: | |
a90917c3 | 111 | lttng_session_destroy(session); |
baf20995 MD |
112 | return ret; |
113 | } | |
114 | ||
271b6681 MD |
115 | static |
116 | int lttng_abi_tracepoint_list(void) | |
117 | { | |
118 | struct file *tracepoint_list_file; | |
119 | int file_fd, ret; | |
120 | ||
4ac10b76 | 121 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
122 | if (file_fd < 0) { |
123 | ret = file_fd; | |
124 | goto fd_error; | |
125 | } | |
30f18bf0 | 126 | |
8ee099b6 | 127 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
128 | <tng_tracepoint_list_fops, |
129 | NULL, O_RDWR); | |
130 | if (IS_ERR(tracepoint_list_file)) { | |
131 | ret = PTR_ERR(tracepoint_list_file); | |
132 | goto file_error; | |
133 | } | |
30f18bf0 MD |
134 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
135 | if (ret < 0) | |
136 | goto open_error; | |
271b6681 MD |
137 | fd_install(file_fd, tracepoint_list_file); |
138 | return file_fd; | |
139 | ||
30f18bf0 MD |
140 | open_error: |
141 | fput(tracepoint_list_file); | |
271b6681 MD |
142 | file_error: |
143 | put_unused_fd(file_fd); | |
144 | fd_error: | |
145 | return ret; | |
146 | } | |
147 | ||
f127e61e MD |
148 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
149 | static inline | |
150 | int lttng_abi_syscall_list(void) | |
151 | { | |
152 | return -ENOSYS; | |
153 | } | |
154 | #else | |
155 | static | |
156 | int lttng_abi_syscall_list(void) | |
157 | { | |
158 | struct file *syscall_list_file; | |
159 | int file_fd, ret; | |
160 | ||
161 | file_fd = lttng_get_unused_fd(); | |
162 | if (file_fd < 0) { | |
163 | ret = file_fd; | |
164 | goto fd_error; | |
165 | } | |
166 | ||
167 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
168 | <tng_syscall_list_fops, | |
169 | NULL, O_RDWR); | |
170 | if (IS_ERR(syscall_list_file)) { | |
171 | ret = PTR_ERR(syscall_list_file); | |
172 | goto file_error; | |
173 | } | |
174 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
175 | if (ret < 0) | |
176 | goto open_error; | |
177 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
178 | return file_fd; |
179 | ||
180 | open_error: | |
181 | fput(syscall_list_file); | |
182 | file_error: | |
183 | put_unused_fd(file_fd); | |
184 | fd_error: | |
185 | return ret; | |
186 | } | |
187 | #endif | |
188 | ||
80c16bcf | 189 | static |
6dccd6c1 | 190 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 191 | { |
6dccd6c1 JD |
192 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
193 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
194 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
195 | } |
196 | ||
42cabb80 MD |
197 | static |
198 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
199 | { | |
200 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
201 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
202 | } | |
203 | ||
8070f5c0 MD |
204 | static |
205 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 206 | struct lttng_kernel_context *context_param, |
a90917c3 | 207 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 208 | { |
8070f5c0 MD |
209 | |
210 | if (session->been_active) | |
211 | return -EPERM; | |
212 | ||
6dccd6c1 | 213 | switch (context_param->ctx) { |
12a313a5 | 214 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 215 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
216 | case LTTNG_KERNEL_CONTEXT_PRIO: |
217 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
218 | case LTTNG_KERNEL_CONTEXT_NICE: |
219 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
220 | case LTTNG_KERNEL_CONTEXT_VPID: |
221 | return lttng_add_vpid_to_ctx(ctx); | |
222 | case LTTNG_KERNEL_CONTEXT_TID: | |
223 | return lttng_add_tid_to_ctx(ctx); | |
224 | case LTTNG_KERNEL_CONTEXT_VTID: | |
225 | return lttng_add_vtid_to_ctx(ctx); | |
226 | case LTTNG_KERNEL_CONTEXT_PPID: | |
227 | return lttng_add_ppid_to_ctx(ctx); | |
228 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
229 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 230 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
231 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
232 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
233 | context_param->u.perf_counter.config, | |
234 | context_param->u.perf_counter.name, | |
c24a0d71 | 235 | ctx); |
a2563e83 MD |
236 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
237 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
238 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
239 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
240 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
241 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
242 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
243 | return lttng_add_interruptible_to_ctx(ctx); | |
244 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
245 | return lttng_add_need_reschedule_to_ctx(ctx); | |
246 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
247 | return lttng_add_preemptible_to_ctx(ctx); | |
248 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
249 | return lttng_add_migratable_to_ctx(ctx); | |
8070f5c0 MD |
250 | default: |
251 | return -EINVAL; | |
252 | } | |
253 | } | |
254 | ||
ad1c05e1 MD |
255 | /** |
256 | * lttng_ioctl - lttng syscall through ioctl | |
257 | * | |
c0e31d2e | 258 | * @file: the file |
ad1c05e1 MD |
259 | * @cmd: the command |
260 | * @arg: command arg | |
261 | * | |
262 | * This ioctl implements lttng commands: | |
38d024ae | 263 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 264 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
265 | * LTTNG_KERNEL_TRACER_VERSION |
266 | * Returns the LTTng kernel tracer version | |
267 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
268 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
269 | * LTTNG_KERNEL_WAIT_QUIESCENT |
270 | * Returns after all previously running probes have completed | |
42cabb80 MD |
271 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
272 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
273 | * |
274 | * The returned session will be deleted when its file descriptor is closed. | |
275 | */ | |
276 | static | |
c0e31d2e | 277 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
278 | { |
279 | switch (cmd) { | |
6dccd6c1 | 280 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 281 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 282 | return lttng_abi_create_session(); |
6dccd6c1 JD |
283 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
284 | { | |
285 | struct lttng_kernel_tracer_version v; | |
286 | struct lttng_kernel_old_tracer_version oldv; | |
287 | struct lttng_kernel_old_tracer_version *uversion = | |
288 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
289 | ||
290 | lttng_abi_tracer_version(&v); | |
291 | oldv.major = v.major; | |
292 | oldv.minor = v.minor; | |
293 | oldv.patchlevel = v.patchlevel; | |
294 | ||
295 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
296 | return -EFAULT; | |
297 | return 0; | |
298 | } | |
80c16bcf | 299 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
300 | { |
301 | struct lttng_kernel_tracer_version version; | |
302 | struct lttng_kernel_tracer_version *uversion = | |
303 | (struct lttng_kernel_tracer_version __user *) arg; | |
304 | ||
305 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
306 | |
307 | if (copy_to_user(uversion, &version, sizeof(version))) | |
308 | return -EFAULT; | |
309 | return 0; | |
310 | } | |
311 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
312 | { | |
313 | struct lttng_kernel_tracer_abi_version version; | |
314 | struct lttng_kernel_tracer_abi_version *uversion = | |
315 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
316 | ||
317 | lttng_abi_tracer_abi_version(&version); | |
318 | ||
6dccd6c1 JD |
319 | if (copy_to_user(uversion, &version, sizeof(version))) |
320 | return -EFAULT; | |
321 | return 0; | |
322 | } | |
323 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
324 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
325 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
326 | case LTTNG_KERNEL_SYSCALL_LIST: |
327 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 328 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
329 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
330 | synchronize_trace(); | |
331 | return 0; | |
6dccd6c1 JD |
332 | case LTTNG_KERNEL_OLD_CALIBRATE: |
333 | { | |
334 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
335 | (struct lttng_kernel_old_calibrate __user *) arg; | |
336 | struct lttng_kernel_old_calibrate old_calibrate; | |
337 | struct lttng_kernel_calibrate calibrate; | |
338 | int ret; | |
339 | ||
340 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
341 | return -EFAULT; | |
342 | calibrate.type = old_calibrate.type; | |
343 | ret = lttng_calibrate(&calibrate); | |
344 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
345 | return -EFAULT; | |
346 | return ret; | |
347 | } | |
57105fc2 MD |
348 | case LTTNG_KERNEL_CALIBRATE: |
349 | { | |
3db41b2c MD |
350 | struct lttng_kernel_calibrate __user *ucalibrate = |
351 | (struct lttng_kernel_calibrate __user *) arg; | |
352 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
353 | int ret; |
354 | ||
355 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
356 | return -EFAULT; | |
357 | ret = lttng_calibrate(&calibrate); | |
358 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
359 | return -EFAULT; | |
360 | return ret; | |
361 | } | |
ad1c05e1 MD |
362 | default: |
363 | return -ENOIOCTLCMD; | |
364 | } | |
365 | } | |
366 | ||
ad1c05e1 | 367 | static const struct file_operations lttng_fops = { |
a33c9927 | 368 | .owner = THIS_MODULE, |
ad1c05e1 MD |
369 | .unlocked_ioctl = lttng_ioctl, |
370 | #ifdef CONFIG_COMPAT | |
03037b98 | 371 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 372 | #endif |
11b5a3c2 | 373 | }; |
ad1c05e1 | 374 | |
5dbbdb43 | 375 | static |
c0e31d2e | 376 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 377 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 378 | enum channel_type channel_type) |
baf20995 | 379 | { |
a90917c3 | 380 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 381 | const struct file_operations *fops = NULL; |
5dbbdb43 | 382 | const char *transport_name; |
a90917c3 | 383 | struct lttng_channel *chan; |
c0e31d2e | 384 | struct file *chan_file; |
baf20995 | 385 | int chan_fd; |
ad1c05e1 | 386 | int ret = 0; |
baf20995 | 387 | |
4ac10b76 | 388 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
389 | if (chan_fd < 0) { |
390 | ret = chan_fd; | |
391 | goto fd_error; | |
392 | } | |
88dfd899 MD |
393 | switch (channel_type) { |
394 | case PER_CPU_CHANNEL: | |
395 | fops = <tng_channel_fops; | |
396 | break; | |
397 | case METADATA_CHANNEL: | |
398 | fops = <tng_metadata_fops; | |
399 | break; | |
400 | } | |
2470a237 | 401 | |
c0e31d2e | 402 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 403 | fops, |
03037b98 | 404 | NULL, O_RDWR); |
c0e31d2e MD |
405 | if (IS_ERR(chan_file)) { |
406 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
407 | goto file_error; |
408 | } | |
5dbbdb43 MD |
409 | switch (channel_type) { |
410 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
411 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
412 | transport_name = chan_param->overwrite ? | |
96ba7208 | 413 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
414 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
415 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
416 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
417 | } else { | |
418 | return -EINVAL; | |
419 | } | |
5dbbdb43 | 420 | break; |
5dbbdb43 | 421 | case METADATA_CHANNEL: |
6dccd6c1 | 422 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 423 | transport_name = "relay-metadata"; |
6dccd6c1 | 424 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
425 | transport_name = "relay-metadata-mmap"; |
426 | else | |
427 | return -EINVAL; | |
5dbbdb43 MD |
428 | break; |
429 | default: | |
430 | transport_name = "<unknown>"; | |
431 | break; | |
432 | } | |
9c1f4643 MD |
433 | if (atomic_long_add_unless(&session_file->f_count, |
434 | 1, INT_MAX) == INT_MAX) { | |
435 | goto refcount_error; | |
436 | } | |
03037b98 MD |
437 | /* |
438 | * We tolerate no failure path after channel creation. It will stay | |
439 | * invariant for the rest of the session. | |
440 | */ | |
a90917c3 | 441 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
442 | chan_param->subbuf_size, |
443 | chan_param->num_subbuf, | |
444 | chan_param->switch_timer_interval, | |
d83004aa JD |
445 | chan_param->read_timer_interval, |
446 | channel_type); | |
03037b98 | 447 | if (!chan) { |
f3d01b96 | 448 | ret = -EINVAL; |
03037b98 MD |
449 | goto chan_error; |
450 | } | |
11b5a3c2 | 451 | chan->file = chan_file; |
c0e31d2e MD |
452 | chan_file->private_data = chan; |
453 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 454 | |
baf20995 MD |
455 | return chan_fd; |
456 | ||
03037b98 | 457 | chan_error: |
9c1f4643 MD |
458 | atomic_long_dec(&session_file->f_count); |
459 | refcount_error: | |
c0e31d2e | 460 | fput(chan_file); |
baf20995 MD |
461 | file_error: |
462 | put_unused_fd(chan_fd); | |
463 | fd_error: | |
baf20995 MD |
464 | return ret; |
465 | } | |
466 | ||
467 | /** | |
ad1c05e1 | 468 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 469 | * |
c0e31d2e | 470 | * @file: the file |
baf20995 MD |
471 | * @cmd: the command |
472 | * @arg: command arg | |
473 | * | |
474 | * This ioctl implements lttng commands: | |
38d024ae | 475 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 476 | * Returns a LTTng channel file descriptor |
e64957da MD |
477 | * LTTNG_KERNEL_ENABLE |
478 | * Enables tracing for a session (weak enable) | |
479 | * LTTNG_KERNEL_DISABLE | |
480 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
481 | * LTTNG_KERNEL_METADATA |
482 | * Returns a LTTng metadata file descriptor | |
e0130fab MD |
483 | * LTTNG_KERNEL_SESSION_TRACK_PID |
484 | * Add PID to session tracker | |
485 | * LTTNG_KERNEL_SESSION_UNTRACK_PID | |
486 | * Remove PID from session tracker | |
ad1c05e1 MD |
487 | * |
488 | * The returned channel will be deleted when its file descriptor is closed. | |
489 | */ | |
490 | static | |
c0e31d2e | 491 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 492 | { |
a90917c3 | 493 | struct lttng_session *session = file->private_data; |
c0e31d2e | 494 | |
ad1c05e1 | 495 | switch (cmd) { |
6dccd6c1 JD |
496 | case LTTNG_KERNEL_OLD_CHANNEL: |
497 | { | |
498 | struct lttng_kernel_channel chan_param; | |
499 | struct lttng_kernel_old_channel old_chan_param; | |
500 | ||
501 | if (copy_from_user(&old_chan_param, | |
502 | (struct lttng_kernel_old_channel __user *) arg, | |
503 | sizeof(struct lttng_kernel_old_channel))) | |
504 | return -EFAULT; | |
505 | chan_param.overwrite = old_chan_param.overwrite; | |
506 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
507 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
508 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
509 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
510 | chan_param.output = old_chan_param.output; | |
511 | ||
512 | return lttng_abi_create_channel(file, &chan_param, | |
513 | PER_CPU_CHANNEL); | |
514 | } | |
38d024ae | 515 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
516 | { |
517 | struct lttng_kernel_channel chan_param; | |
518 | ||
519 | if (copy_from_user(&chan_param, | |
38d024ae | 520 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
521 | sizeof(struct lttng_kernel_channel))) |
522 | return -EFAULT; | |
523 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 524 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
525 | } |
526 | case LTTNG_KERNEL_OLD_SESSION_START: | |
527 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 528 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 529 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 530 | return lttng_session_enable(session); |
6dccd6c1 JD |
531 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
532 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 533 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 534 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 535 | return lttng_session_disable(session); |
6dccd6c1 JD |
536 | case LTTNG_KERNEL_OLD_METADATA: |
537 | { | |
538 | struct lttng_kernel_channel chan_param; | |
539 | struct lttng_kernel_old_channel old_chan_param; | |
540 | ||
541 | if (copy_from_user(&old_chan_param, | |
542 | (struct lttng_kernel_old_channel __user *) arg, | |
543 | sizeof(struct lttng_kernel_old_channel))) | |
544 | return -EFAULT; | |
545 | chan_param.overwrite = old_chan_param.overwrite; | |
546 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
547 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
548 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
549 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
550 | chan_param.output = old_chan_param.output; | |
551 | ||
552 | return lttng_abi_create_channel(file, &chan_param, | |
553 | METADATA_CHANNEL); | |
554 | } | |
38d024ae | 555 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
556 | { |
557 | struct lttng_kernel_channel chan_param; | |
558 | ||
559 | if (copy_from_user(&chan_param, | |
560 | (struct lttng_kernel_channel __user *) arg, | |
561 | sizeof(struct lttng_kernel_channel))) | |
562 | return -EFAULT; | |
563 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 564 | METADATA_CHANNEL); |
6dccd6c1 | 565 | } |
e0130fab MD |
566 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
567 | return lttng_session_track_pid(session, (int) arg); | |
568 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: | |
569 | return lttng_session_untrack_pid(session, (int) arg); | |
7e6f9ef6 MD |
570 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
571 | return lttng_session_list_tracker_pids(session); | |
9616f0bf JD |
572 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
573 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
574 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
575 | return lttng_session_statedump(session); | |
ad1c05e1 MD |
576 | default: |
577 | return -ENOIOCTLCMD; | |
578 | } | |
579 | } | |
580 | ||
03037b98 MD |
581 | /* |
582 | * Called when the last file reference is dropped. | |
583 | * | |
584 | * Big fat note: channels and events are invariant for the whole session after | |
585 | * their creation. So this session destruction also destroys all channel and | |
586 | * event structures specific to this session (they are not destroyed when their | |
587 | * individual file is released). | |
588 | */ | |
ad1c05e1 | 589 | static |
03037b98 | 590 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 591 | { |
a90917c3 | 592 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
593 | |
594 | if (session) | |
a90917c3 | 595 | lttng_session_destroy(session); |
11b5a3c2 | 596 | return 0; |
ad1c05e1 | 597 | } |
ad1c05e1 MD |
598 | |
599 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 600 | .owner = THIS_MODULE, |
03037b98 | 601 | .release = lttng_session_release, |
ad1c05e1 MD |
602 | .unlocked_ioctl = lttng_session_ioctl, |
603 | #ifdef CONFIG_COMPAT | |
03037b98 | 604 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 605 | #endif |
11b5a3c2 | 606 | }; |
ad1c05e1 | 607 | |
d83004aa JD |
608 | /** |
609 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
610 | * @filp: the file | |
611 | * @wait: poll table | |
612 | * | |
613 | * Handles the poll operations for the metadata channels. | |
614 | */ | |
ad1c05e1 | 615 | static |
d83004aa JD |
616 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
617 | poll_table *wait) | |
618 | { | |
619 | struct lttng_metadata_stream *stream = filp->private_data; | |
620 | struct lib_ring_buffer *buf = stream->priv; | |
621 | int finalized; | |
622 | unsigned int mask = 0; | |
623 | ||
624 | if (filp->f_mode & FMODE_READ) { | |
625 | poll_wait_set_exclusive(wait); | |
626 | poll_wait(filp, &stream->read_wait, wait); | |
627 | ||
628 | finalized = stream->finalized; | |
629 | ||
630 | /* | |
631 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
632 | * ordering finalized load before offsets loads. | |
633 | */ | |
634 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
635 | ||
636 | if (finalized) | |
637 | mask |= POLLHUP; | |
638 | ||
92d9f5e6 | 639 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 640 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 641 | stream->metadata_out) |
d83004aa | 642 | mask |= POLLIN; |
92d9f5e6 | 643 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
644 | } |
645 | ||
646 | return mask; | |
647 | } | |
648 | ||
f613e3e6 MD |
649 | static |
650 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
651 | unsigned int cmd, unsigned long arg) | |
652 | { | |
653 | struct lttng_metadata_stream *stream = filp->private_data; | |
654 | ||
655 | stream->metadata_out = stream->metadata_in; | |
656 | } | |
657 | ||
d1344afa JD |
658 | /* |
659 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
660 | * the consumer receives the content of the metadata cache unchanged. This is | |
661 | * different from the metadata_regenerate where the offset from epoch is | |
662 | * resampled, here we want the exact same content as the last time the metadata | |
663 | * was generated. This command is only possible if all the metadata written | |
664 | * in the cache has been output to the metadata stream to avoid corrupting the | |
665 | * metadata file. | |
666 | * | |
667 | * Return 0 on success, a negative value on error. | |
668 | */ | |
669 | static | |
670 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
671 | { | |
672 | int ret; | |
673 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
674 | ||
675 | mutex_lock(&cache->lock); | |
676 | if (stream->metadata_out != cache->metadata_written) { | |
677 | ret = -EBUSY; | |
678 | goto end; | |
679 | } | |
680 | stream->metadata_out = 0; | |
681 | stream->metadata_in = 0; | |
682 | wake_up_interruptible(&stream->read_wait); | |
683 | ret = 0; | |
684 | ||
685 | end: | |
686 | mutex_unlock(&cache->lock); | |
687 | return ret; | |
688 | } | |
689 | ||
d83004aa JD |
690 | static |
691 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
692 | unsigned int cmd, unsigned long arg) | |
693 | { | |
694 | int ret; | |
695 | struct lttng_metadata_stream *stream = filp->private_data; | |
696 | struct lib_ring_buffer *buf = stream->priv; | |
697 | ||
698 | switch (cmd) { | |
d83004aa JD |
699 | case RING_BUFFER_GET_NEXT_SUBBUF: |
700 | { | |
35097f36 JD |
701 | struct lttng_metadata_stream *stream = filp->private_data; |
702 | struct lib_ring_buffer *buf = stream->priv; | |
703 | struct channel *chan = buf->backend.chan; | |
704 | ||
705 | ret = lttng_metadata_output_channel(stream, chan); | |
706 | if (ret > 0) { | |
707 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
708 | ret = 0; | |
709 | } else if (ret < 0) | |
d83004aa JD |
710 | goto err; |
711 | break; | |
712 | } | |
f613e3e6 MD |
713 | case RING_BUFFER_GET_SUBBUF: |
714 | { | |
715 | /* | |
716 | * Random access is not allowed for metadata channel. | |
717 | */ | |
718 | return -ENOSYS; | |
719 | } | |
c6f05468 | 720 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
721 | case RING_BUFFER_FLUSH: |
722 | { | |
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 | /* | |
728 | * Before doing the actual ring buffer flush, write up to one | |
729 | * packet of metadata in the ring buffer. | |
730 | */ | |
731 | ret = lttng_metadata_output_channel(stream, chan); | |
732 | if (ret < 0) | |
733 | goto err; | |
734 | break; | |
735 | } | |
9616f0bf JD |
736 | case RING_BUFFER_GET_METADATA_VERSION: |
737 | { | |
738 | struct lttng_metadata_stream *stream = filp->private_data; | |
739 | ||
740 | return put_u64(stream->version, arg); | |
741 | } | |
d1344afa JD |
742 | case RING_BUFFER_METADATA_CACHE_DUMP: |
743 | { | |
744 | struct lttng_metadata_stream *stream = filp->private_data; | |
745 | ||
746 | return lttng_metadata_cache_dump(stream); | |
747 | } | |
d83004aa JD |
748 | default: |
749 | break; | |
750 | } | |
f613e3e6 MD |
751 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
752 | ||
d83004aa | 753 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
754 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
755 | if (ret < 0) | |
756 | goto err; | |
d83004aa | 757 | |
f613e3e6 MD |
758 | switch (cmd) { |
759 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
760 | { | |
761 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
762 | cmd, arg); | |
763 | break; | |
764 | } | |
765 | default: | |
766 | break; | |
767 | } | |
d83004aa JD |
768 | err: |
769 | return ret; | |
770 | } | |
771 | ||
aeb9064d | 772 | #ifdef CONFIG_COMPAT |
d83004aa JD |
773 | static |
774 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
775 | unsigned int cmd, unsigned long arg) | |
776 | { | |
777 | int ret; | |
778 | struct lttng_metadata_stream *stream = filp->private_data; | |
779 | struct lib_ring_buffer *buf = stream->priv; | |
780 | ||
781 | switch (cmd) { | |
d83004aa JD |
782 | case RING_BUFFER_GET_NEXT_SUBBUF: |
783 | { | |
35097f36 JD |
784 | struct lttng_metadata_stream *stream = filp->private_data; |
785 | struct lib_ring_buffer *buf = stream->priv; | |
786 | struct channel *chan = buf->backend.chan; | |
787 | ||
788 | ret = lttng_metadata_output_channel(stream, chan); | |
789 | if (ret > 0) { | |
790 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
791 | ret = 0; | |
792 | } else if (ret < 0) | |
d83004aa JD |
793 | goto err; |
794 | break; | |
795 | } | |
f613e3e6 MD |
796 | case RING_BUFFER_GET_SUBBUF: |
797 | { | |
798 | /* | |
799 | * Random access is not allowed for metadata channel. | |
800 | */ | |
801 | return -ENOSYS; | |
802 | } | |
c6f05468 | 803 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
804 | case RING_BUFFER_FLUSH: |
805 | { | |
806 | struct lttng_metadata_stream *stream = filp->private_data; | |
807 | struct lib_ring_buffer *buf = stream->priv; | |
808 | struct channel *chan = buf->backend.chan; | |
809 | ||
810 | /* | |
811 | * Before doing the actual ring buffer flush, write up to one | |
812 | * packet of metadata in the ring buffer. | |
813 | */ | |
814 | ret = lttng_metadata_output_channel(stream, chan); | |
815 | if (ret < 0) | |
816 | goto err; | |
817 | break; | |
818 | } | |
819 | case RING_BUFFER_GET_METADATA_VERSION: | |
820 | { | |
821 | struct lttng_metadata_stream *stream = filp->private_data; | |
822 | ||
823 | return put_u64(stream->version, arg); | |
824 | } | |
d1344afa JD |
825 | case RING_BUFFER_METADATA_CACHE_DUMP: |
826 | { | |
827 | struct lttng_metadata_stream *stream = filp->private_data; | |
828 | ||
829 | return lttng_metadata_cache_dump(stream); | |
830 | } | |
d83004aa JD |
831 | default: |
832 | break; | |
833 | } | |
f613e3e6 MD |
834 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
835 | ||
d83004aa | 836 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
837 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
838 | if (ret < 0) | |
839 | goto err; | |
d83004aa | 840 | |
f613e3e6 MD |
841 | switch (cmd) { |
842 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
843 | { | |
844 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
845 | cmd, arg); | |
846 | break; | |
847 | } | |
848 | default: | |
849 | break; | |
850 | } | |
d83004aa JD |
851 | err: |
852 | return ret; | |
853 | } | |
aeb9064d | 854 | #endif |
d83004aa | 855 | |
b3b8072b MD |
856 | /* |
857 | * This is not used by anonymous file descriptors. This code is left | |
858 | * there if we ever want to implement an inode with open() operation. | |
859 | */ | |
d83004aa JD |
860 | static |
861 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
862 | { | |
863 | struct lttng_metadata_stream *stream = inode->i_private; | |
864 | struct lib_ring_buffer *buf = stream->priv; | |
865 | ||
866 | file->private_data = buf; | |
b3b8072b MD |
867 | /* |
868 | * Since life-time of metadata cache differs from that of | |
869 | * session, we need to keep our own reference on the transport. | |
870 | */ | |
871 | if (!try_module_get(stream->transport->owner)) { | |
872 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
873 | return -EBUSY; | |
874 | } | |
d83004aa JD |
875 | return lib_ring_buffer_open(inode, file, buf); |
876 | } | |
877 | ||
878 | static | |
879 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
880 | { | |
881 | struct lttng_metadata_stream *stream = file->private_data; | |
882 | struct lib_ring_buffer *buf = stream->priv; | |
883 | ||
884 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 885 | module_put(stream->transport->owner); |
d83004aa JD |
886 | return lib_ring_buffer_release(inode, file, buf); |
887 | } | |
888 | ||
889 | static | |
890 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
891 | struct pipe_inode_info *pipe, size_t len, | |
892 | unsigned int flags) | |
893 | { | |
894 | struct lttng_metadata_stream *stream = in->private_data; | |
895 | struct lib_ring_buffer *buf = stream->priv; | |
896 | ||
897 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
898 | flags, buf); | |
899 | } | |
900 | ||
901 | static | |
902 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
903 | struct vm_area_struct *vma) | |
904 | { | |
905 | struct lttng_metadata_stream *stream = filp->private_data; | |
906 | struct lib_ring_buffer *buf = stream->priv; | |
907 | ||
908 | return lib_ring_buffer_mmap(filp, vma, buf); | |
909 | } | |
910 | ||
911 | static | |
912 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
913 | .owner = THIS_MODULE, | |
914 | .open = lttng_metadata_ring_buffer_open, | |
915 | .release = lttng_metadata_ring_buffer_release, | |
916 | .poll = lttng_metadata_ring_buffer_poll, | |
917 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
918 | .mmap = lttng_metadata_ring_buffer_mmap, | |
919 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
920 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
921 | #ifdef CONFIG_COMPAT | |
922 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
923 | #endif | |
924 | }; | |
925 | ||
926 | static | |
927 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
928 | const struct file_operations *fops) | |
ad1c05e1 | 929 | { |
ad1c05e1 | 930 | int stream_fd, ret; |
11b5a3c2 | 931 | struct file *stream_file; |
ad1c05e1 | 932 | |
4ac10b76 | 933 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
934 | if (stream_fd < 0) { |
935 | ret = stream_fd; | |
936 | goto fd_error; | |
937 | } | |
d83004aa JD |
938 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
939 | stream_priv, O_RDWR); | |
c0e31d2e MD |
940 | if (IS_ERR(stream_file)) { |
941 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
942 | goto file_error; |
943 | } | |
409453cb MD |
944 | /* |
945 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
946 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
947 | * file descriptor, so we set FMODE_PREAD here. | |
948 | */ | |
d7b6f197 | 949 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 950 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
951 | /* |
952 | * The stream holds a reference to the channel within the generic ring | |
953 | * buffer library, so no need to hold a refcount on the channel and | |
954 | * session files here. | |
955 | */ | |
ad1c05e1 MD |
956 | return stream_fd; |
957 | ||
958 | file_error: | |
959 | put_unused_fd(stream_fd); | |
d83004aa JD |
960 | fd_error: |
961 | return ret; | |
962 | } | |
963 | ||
964 | static | |
965 | int lttng_abi_open_stream(struct file *channel_file) | |
966 | { | |
967 | struct lttng_channel *channel = channel_file->private_data; | |
968 | struct lib_ring_buffer *buf; | |
969 | int ret; | |
970 | void *stream_priv; | |
971 | ||
972 | buf = channel->ops->buffer_read_open(channel->chan); | |
973 | if (!buf) | |
974 | return -ENOENT; | |
975 | ||
976 | stream_priv = buf; | |
977 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 978 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
979 | if (ret < 0) |
980 | goto fd_error; | |
981 | ||
982 | return ret; | |
983 | ||
984 | fd_error: | |
985 | channel->ops->buffer_read_close(buf); | |
986 | return ret; | |
987 | } | |
988 | ||
989 | static | |
990 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
991 | { | |
992 | struct lttng_channel *channel = channel_file->private_data; | |
993 | struct lttng_session *session = channel->session; | |
994 | struct lib_ring_buffer *buf; | |
995 | int ret; | |
996 | struct lttng_metadata_stream *metadata_stream; | |
997 | void *stream_priv; | |
998 | ||
999 | buf = channel->ops->buffer_read_open(channel->chan); | |
1000 | if (!buf) | |
1001 | return -ENOENT; | |
1002 | ||
1003 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1004 | GFP_KERNEL); | |
b3b8072b MD |
1005 | if (!metadata_stream) { |
1006 | ret = -ENOMEM; | |
1007 | goto nomem; | |
1008 | } | |
d83004aa JD |
1009 | metadata_stream->metadata_cache = session->metadata_cache; |
1010 | init_waitqueue_head(&metadata_stream->read_wait); | |
1011 | metadata_stream->priv = buf; | |
1012 | stream_priv = metadata_stream; | |
b3b8072b MD |
1013 | metadata_stream->transport = channel->transport; |
1014 | ||
1015 | /* | |
1016 | * Since life-time of metadata cache differs from that of | |
1017 | * session, we need to keep our own reference on the transport. | |
1018 | */ | |
1019 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1020 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1021 | ret = -EINVAL; | |
1022 | goto notransport; | |
1023 | } | |
1024 | ||
901aaa5f FD |
1025 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1026 | ret = -EOVERFLOW; | |
9c1f4643 | 1027 | goto kref_error; |
901aaa5f FD |
1028 | } |
1029 | ||
d83004aa JD |
1030 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
1031 | <tng_metadata_ring_buffer_file_operations); | |
1032 | if (ret < 0) | |
1033 | goto fd_error; | |
1034 | ||
d83004aa JD |
1035 | list_add(&metadata_stream->list, |
1036 | &session->metadata_cache->metadata_stream); | |
1037 | return ret; | |
1038 | ||
ad1c05e1 | 1039 | fd_error: |
9c1f4643 MD |
1040 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1041 | kref_error: | |
b3b8072b MD |
1042 | module_put(metadata_stream->transport->owner); |
1043 | notransport: | |
1044 | kfree(metadata_stream); | |
1045 | nomem: | |
11b5a3c2 | 1046 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1047 | return ret; |
1048 | } | |
1049 | ||
653fe716 | 1050 | static |
c0e31d2e | 1051 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1052 | struct lttng_kernel_event *event_param) |
653fe716 | 1053 | { |
a90917c3 | 1054 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1055 | int event_fd, ret; |
11b5a3c2 | 1056 | struct file *event_file; |
3c997079 | 1057 | void *priv; |
653fe716 | 1058 | |
6dccd6c1 JD |
1059 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1060 | switch (event_param->instrumentation) { | |
7371f44c | 1061 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1062 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1063 | break; |
ab2277d6 | 1064 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1065 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1066 | break; |
ab2277d6 | 1067 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 1068 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
1069 | break; |
1070 | default: | |
1071 | break; | |
1072 | } | |
33a39a3c MD |
1073 | event_fd = lttng_get_unused_fd(); |
1074 | if (event_fd < 0) { | |
1075 | ret = event_fd; | |
1076 | goto fd_error; | |
1077 | } | |
1078 | event_file = anon_inode_getfile("[lttng_event]", | |
1079 | <tng_event_fops, | |
1080 | NULL, O_RDWR); | |
1081 | if (IS_ERR(event_file)) { | |
1082 | ret = PTR_ERR(event_file); | |
1083 | goto file_error; | |
1084 | } | |
9c1f4643 MD |
1085 | /* The event holds a reference on the channel */ |
1086 | if (atomic_long_add_unless(&channel_file->f_count, | |
1087 | 1, INT_MAX) == INT_MAX) { | |
0d2c717f | 1088 | ret = -EOVERFLOW; |
9c1f4643 MD |
1089 | goto refcount_error; |
1090 | } | |
33a39a3c MD |
1091 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1092 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1093 | struct lttng_enabler *enabler; | |
1094 | ||
4993071a PP |
1095 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1096 | /* | |
1097 | * If the event name is a star globbing pattern, | |
1098 | * we create the special star globbing enabler. | |
1099 | */ | |
1100 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, | |
33a39a3c | 1101 | event_param, channel); |
3c997079 | 1102 | } else { |
33a39a3c MD |
1103 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1104 | event_param, channel); | |
1ec65de1 | 1105 | } |
33a39a3c MD |
1106 | priv = enabler; |
1107 | } else { | |
1108 | struct lttng_event *event; | |
4ee2453d | 1109 | |
33a39a3c MD |
1110 | /* |
1111 | * We tolerate no failure path after event creation. It | |
1112 | * will stay invariant for the rest of the session. | |
1113 | */ | |
1114 | event = lttng_event_create(channel, event_param, | |
1115 | NULL, NULL, | |
1116 | event_param->instrumentation); | |
1117 | WARN_ON_ONCE(!event); | |
1118 | if (IS_ERR(event)) { | |
1119 | ret = PTR_ERR(event); | |
1120 | goto event_error; | |
80f87dd2 | 1121 | } |
33a39a3c | 1122 | priv = event; |
03037b98 | 1123 | } |
33a39a3c MD |
1124 | event_file->private_data = priv; |
1125 | fd_install(event_fd, event_file); | |
653fe716 MD |
1126 | return event_fd; |
1127 | ||
03037b98 | 1128 | event_error: |
9c1f4643 MD |
1129 | atomic_long_dec(&channel_file->f_count); |
1130 | refcount_error: | |
c0e31d2e | 1131 | fput(event_file); |
653fe716 MD |
1132 | file_error: |
1133 | put_unused_fd(event_fd); | |
1134 | fd_error: | |
653fe716 MD |
1135 | return ret; |
1136 | } | |
ad1c05e1 MD |
1137 | |
1138 | /** | |
1139 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1140 | * | |
c0e31d2e | 1141 | * @file: the file |
ad1c05e1 MD |
1142 | * @cmd: the command |
1143 | * @arg: command arg | |
1144 | * | |
1145 | * This ioctl implements lttng commands: | |
38d024ae | 1146 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1147 | * Returns an event stream file descriptor or failure. |
1148 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1149 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1150 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1151 | * LTTNG_KERNEL_CONTEXT |
1152 | * Prepend a context field to each event in the channel | |
e64957da MD |
1153 | * LTTNG_KERNEL_ENABLE |
1154 | * Enable recording for events in this channel (weak enable) | |
1155 | * LTTNG_KERNEL_DISABLE | |
1156 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1157 | * |
baf20995 MD |
1158 | * Channel and event file descriptors also hold a reference on the session. |
1159 | */ | |
ad1c05e1 | 1160 | static |
c0e31d2e | 1161 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1162 | { |
a90917c3 | 1163 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1164 | |
baf20995 | 1165 | switch (cmd) { |
6dccd6c1 | 1166 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1167 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1168 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1169 | case LTTNG_KERNEL_OLD_EVENT: |
1170 | { | |
1171 | struct lttng_kernel_event *uevent_param; | |
1172 | struct lttng_kernel_old_event *old_uevent_param; | |
1173 | int ret; | |
1174 | ||
1175 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1176 | GFP_KERNEL); | |
1177 | if (!uevent_param) { | |
1178 | ret = -ENOMEM; | |
1179 | goto old_event_end; | |
1180 | } | |
1181 | old_uevent_param = kmalloc( | |
1182 | sizeof(struct lttng_kernel_old_event), | |
1183 | GFP_KERNEL); | |
1184 | if (!old_uevent_param) { | |
1185 | ret = -ENOMEM; | |
1186 | goto old_event_error_free_param; | |
1187 | } | |
1188 | if (copy_from_user(old_uevent_param, | |
1189 | (struct lttng_kernel_old_event __user *) arg, | |
1190 | sizeof(struct lttng_kernel_old_event))) { | |
1191 | ret = -EFAULT; | |
1192 | goto old_event_error_free_old_param; | |
1193 | } | |
1194 | ||
1195 | memcpy(uevent_param->name, old_uevent_param->name, | |
1196 | sizeof(uevent_param->name)); | |
1197 | uevent_param->instrumentation = | |
1198 | old_uevent_param->instrumentation; | |
1199 | ||
1200 | switch (old_uevent_param->instrumentation) { | |
1201 | case LTTNG_KERNEL_KPROBE: | |
1202 | uevent_param->u.kprobe.addr = | |
1203 | old_uevent_param->u.kprobe.addr; | |
1204 | uevent_param->u.kprobe.offset = | |
1205 | old_uevent_param->u.kprobe.offset; | |
1206 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1207 | old_uevent_param->u.kprobe.symbol_name, | |
1208 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1209 | break; | |
1210 | case LTTNG_KERNEL_KRETPROBE: | |
1211 | uevent_param->u.kretprobe.addr = | |
1212 | old_uevent_param->u.kretprobe.addr; | |
1213 | uevent_param->u.kretprobe.offset = | |
1214 | old_uevent_param->u.kretprobe.offset; | |
1215 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1216 | old_uevent_param->u.kretprobe.symbol_name, | |
1217 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1218 | break; | |
1219 | case LTTNG_KERNEL_FUNCTION: | |
1220 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1221 | old_uevent_param->u.ftrace.symbol_name, | |
1222 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1223 | break; | |
1224 | default: | |
1225 | break; | |
1226 | } | |
1227 | ret = lttng_abi_create_event(file, uevent_param); | |
1228 | ||
1229 | old_event_error_free_old_param: | |
1230 | kfree(old_uevent_param); | |
1231 | old_event_error_free_param: | |
1232 | kfree(uevent_param); | |
1233 | old_event_end: | |
1234 | return ret; | |
1235 | } | |
38d024ae | 1236 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1237 | { |
1238 | struct lttng_kernel_event uevent_param; | |
1239 | ||
1240 | if (copy_from_user(&uevent_param, | |
1241 | (struct lttng_kernel_event __user *) arg, | |
1242 | sizeof(uevent_param))) | |
1243 | return -EFAULT; | |
1244 | return lttng_abi_create_event(file, &uevent_param); | |
1245 | } | |
1246 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1247 | { | |
1248 | struct lttng_kernel_context *ucontext_param; | |
1249 | struct lttng_kernel_old_context *old_ucontext_param; | |
1250 | int ret; | |
1251 | ||
1252 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1253 | GFP_KERNEL); | |
1254 | if (!ucontext_param) { | |
1255 | ret = -ENOMEM; | |
1256 | goto old_ctx_end; | |
1257 | } | |
1258 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1259 | GFP_KERNEL); | |
1260 | if (!old_ucontext_param) { | |
1261 | ret = -ENOMEM; | |
1262 | goto old_ctx_error_free_param; | |
1263 | } | |
1264 | ||
1265 | if (copy_from_user(old_ucontext_param, | |
1266 | (struct lttng_kernel_old_context __user *) arg, | |
1267 | sizeof(struct lttng_kernel_old_context))) { | |
1268 | ret = -EFAULT; | |
1269 | goto old_ctx_error_free_old_param; | |
1270 | } | |
1271 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1272 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1273 | sizeof(ucontext_param->padding)); | |
1274 | /* only type that uses the union */ | |
1275 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1276 | ucontext_param->u.perf_counter.type = | |
1277 | old_ucontext_param->u.perf_counter.type; | |
1278 | ucontext_param->u.perf_counter.config = | |
1279 | old_ucontext_param->u.perf_counter.config; | |
1280 | memcpy(ucontext_param->u.perf_counter.name, | |
1281 | old_ucontext_param->u.perf_counter.name, | |
1282 | sizeof(ucontext_param->u.perf_counter.name)); | |
1283 | } | |
1284 | ||
1285 | ret = lttng_abi_add_context(file, | |
1286 | ucontext_param, | |
1287 | &channel->ctx, channel->session); | |
1288 | ||
1289 | old_ctx_error_free_old_param: | |
1290 | kfree(old_ucontext_param); | |
1291 | old_ctx_error_free_param: | |
1292 | kfree(ucontext_param); | |
1293 | old_ctx_end: | |
1294 | return ret; | |
1295 | } | |
8070f5c0 | 1296 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1297 | { |
1298 | struct lttng_kernel_context ucontext_param; | |
1299 | ||
1300 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1301 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1302 | sizeof(ucontext_param))) |
1303 | return -EFAULT; | |
1304 | return lttng_abi_add_context(file, | |
1305 | &ucontext_param, | |
8070f5c0 | 1306 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1307 | } |
1308 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1309 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1310 | return lttng_channel_enable(channel); |
6dccd6c1 | 1311 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1312 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1313 | return lttng_channel_disable(channel); |
12e579db MD |
1314 | case LTTNG_KERNEL_SYSCALL_MASK: |
1315 | return lttng_channel_syscall_mask(channel, | |
1316 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1317 | default: |
1318 | return -ENOIOCTLCMD; | |
1319 | } | |
6dccd6c1 | 1320 | |
baf20995 MD |
1321 | } |
1322 | ||
5dbbdb43 MD |
1323 | /** |
1324 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1325 | * | |
1326 | * @file: the file | |
1327 | * @cmd: the command | |
1328 | * @arg: command arg | |
1329 | * | |
1330 | * This ioctl implements lttng commands: | |
38d024ae | 1331 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1332 | * Returns an event stream file descriptor or failure. |
1333 | * | |
1334 | * Channel and event file descriptors also hold a reference on the session. | |
1335 | */ | |
1336 | static | |
1337 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1338 | { | |
1339 | switch (cmd) { | |
6dccd6c1 | 1340 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1341 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1342 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1343 | default: |
1344 | return -ENOIOCTLCMD; | |
1345 | } | |
1346 | } | |
1347 | ||
653fe716 MD |
1348 | /** |
1349 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1350 | * | |
c0e31d2e | 1351 | * @file: the file |
653fe716 MD |
1352 | * @wait: poll table |
1353 | */ | |
c0e31d2e | 1354 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1355 | { |
a90917c3 | 1356 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1357 | unsigned int mask = 0; |
1358 | ||
c0e31d2e | 1359 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1360 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1361 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1362 | wait); | |
653fe716 | 1363 | |
254ec7bc MD |
1364 | if (channel->ops->is_disabled(channel->chan)) |
1365 | return POLLERR; | |
24cedcfe | 1366 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1367 | return POLLHUP; |
f71ecafa | 1368 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1369 | return POLLIN | POLLRDNORM; |
f71ecafa | 1370 | return 0; |
653fe716 MD |
1371 | } |
1372 | return mask; | |
1373 | ||
1374 | } | |
1375 | ||
0a84a57f MD |
1376 | static |
1377 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1378 | { | |
a90917c3 | 1379 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1380 | |
1381 | if (channel) | |
1382 | fput(channel->session->file); | |
0a84a57f MD |
1383 | return 0; |
1384 | } | |
1385 | ||
d83004aa JD |
1386 | static |
1387 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1388 | { | |
1389 | struct lttng_channel *channel = file->private_data; | |
1390 | ||
1391 | if (channel) { | |
d83004aa | 1392 | fput(channel->session->file); |
a3381417 | 1393 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1394 | } |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | ||
ad1c05e1 | 1399 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1400 | .owner = THIS_MODULE, |
03037b98 | 1401 | .release = lttng_channel_release, |
653fe716 | 1402 | .poll = lttng_channel_poll, |
ad1c05e1 | 1403 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1404 | #ifdef CONFIG_COMPAT |
03037b98 | 1405 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1406 | #endif |
11b5a3c2 | 1407 | }; |
baf20995 | 1408 | |
5dbbdb43 | 1409 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1410 | .owner = THIS_MODULE, |
d83004aa | 1411 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1412 | .unlocked_ioctl = lttng_metadata_ioctl, |
1413 | #ifdef CONFIG_COMPAT | |
1414 | .compat_ioctl = lttng_metadata_ioctl, | |
1415 | #endif | |
1416 | }; | |
1417 | ||
8070f5c0 MD |
1418 | /** |
1419 | * lttng_event_ioctl - lttng syscall through ioctl | |
1420 | * | |
1421 | * @file: the file | |
1422 | * @cmd: the command | |
1423 | * @arg: command arg | |
1424 | * | |
1425 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1426 | * LTTNG_KERNEL_CONTEXT |
1427 | * Prepend a context field to each record of this event | |
e64957da MD |
1428 | * LTTNG_KERNEL_ENABLE |
1429 | * Enable recording for this event (weak enable) | |
1430 | * LTTNG_KERNEL_DISABLE | |
1431 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1432 | */ |
1433 | static | |
1434 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1435 | { | |
3c997079 MD |
1436 | struct lttng_event *event; |
1437 | struct lttng_enabler *enabler; | |
1438 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1439 | |
1440 | switch (cmd) { | |
6dccd6c1 JD |
1441 | case LTTNG_KERNEL_OLD_CONTEXT: |
1442 | { | |
3c997079 MD |
1443 | /* Not implemented */ |
1444 | return -ENOSYS; | |
6dccd6c1 | 1445 | } |
8070f5c0 | 1446 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1447 | { |
3c997079 MD |
1448 | /* Not implemented */ |
1449 | return -ENOSYS; | |
6dccd6c1 JD |
1450 | } |
1451 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1452 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1453 | switch (*evtype) { |
1454 | case LTTNG_TYPE_EVENT: | |
1455 | event = file->private_data; | |
1456 | return lttng_event_enable(event); | |
1457 | case LTTNG_TYPE_ENABLER: | |
1458 | enabler = file->private_data; | |
1459 | return lttng_enabler_enable(enabler); | |
1460 | default: | |
1461 | WARN_ON_ONCE(1); | |
1462 | return -ENOSYS; | |
1463 | } | |
6dccd6c1 | 1464 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1465 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1466 | switch (*evtype) { |
1467 | case LTTNG_TYPE_EVENT: | |
1468 | event = file->private_data; | |
1469 | return lttng_event_disable(event); | |
1470 | case LTTNG_TYPE_ENABLER: | |
1471 | enabler = file->private_data; | |
1472 | return lttng_enabler_disable(enabler); | |
1473 | default: | |
1474 | WARN_ON_ONCE(1); | |
1475 | return -ENOSYS; | |
1476 | } | |
07dfc1d0 MD |
1477 | case LTTNG_KERNEL_FILTER: |
1478 | switch (*evtype) { | |
1479 | case LTTNG_TYPE_EVENT: | |
1480 | return -EINVAL; | |
1481 | case LTTNG_TYPE_ENABLER: | |
1482 | { | |
1483 | enabler = file->private_data; | |
1484 | return lttng_enabler_attach_bytecode(enabler, | |
1485 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1486 | } | |
1487 | ||
1488 | } | |
8070f5c0 MD |
1489 | default: |
1490 | return -ENOIOCTLCMD; | |
1491 | } | |
1492 | } | |
1493 | ||
0a84a57f MD |
1494 | static |
1495 | int lttng_event_release(struct inode *inode, struct file *file) | |
1496 | { | |
3c997079 MD |
1497 | struct lttng_event *event; |
1498 | struct lttng_enabler *enabler; | |
1499 | enum lttng_event_type *evtype = file->private_data; | |
1500 | ||
1501 | if (!evtype) | |
1502 | return 0; | |
1503 | ||
1504 | switch (*evtype) { | |
1505 | case LTTNG_TYPE_EVENT: | |
1506 | event = file->private_data; | |
1507 | if (event) | |
1508 | fput(event->chan->file); | |
1509 | break; | |
1510 | case LTTNG_TYPE_ENABLER: | |
1511 | enabler = file->private_data; | |
1512 | if (enabler) | |
1513 | fput(enabler->chan->file); | |
1514 | break; | |
1515 | default: | |
1516 | WARN_ON_ONCE(1); | |
1517 | break; | |
1518 | } | |
c269fff4 | 1519 | |
0a84a57f MD |
1520 | return 0; |
1521 | } | |
1522 | ||
3b923e5b | 1523 | /* TODO: filter control ioctl */ |
0a84a57f | 1524 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1525 | .owner = THIS_MODULE, |
0a84a57f | 1526 | .release = lttng_event_release, |
8070f5c0 MD |
1527 | .unlocked_ioctl = lttng_event_ioctl, |
1528 | #ifdef CONFIG_COMPAT | |
1529 | .compat_ioctl = lttng_event_ioctl, | |
1530 | #endif | |
11b5a3c2 | 1531 | }; |
0a84a57f | 1532 | |
3b731ab1 JD |
1533 | static int put_u64(uint64_t val, unsigned long arg) |
1534 | { | |
1535 | return put_user(val, (uint64_t __user *) arg); | |
1536 | } | |
1537 | ||
ed8d02d6 JD |
1538 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1539 | unsigned int cmd, unsigned long arg) | |
1540 | { | |
3b731ab1 JD |
1541 | struct lib_ring_buffer *buf = filp->private_data; |
1542 | struct channel *chan = buf->backend.chan; | |
1543 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1544 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1545 | int ret; |
1546 | ||
1547 | if (atomic_read(&chan->record_disabled)) | |
1548 | return -EIO; | |
1549 | ||
ed8d02d6 | 1550 | switch (cmd) { |
3b731ab1 JD |
1551 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1552 | { | |
1553 | uint64_t ts; | |
1554 | ||
dd5a0db3 | 1555 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1556 | if (ret < 0) |
1557 | goto error; | |
1558 | return put_u64(ts, arg); | |
1559 | } | |
1560 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1561 | { | |
1562 | uint64_t ts; | |
1563 | ||
dd5a0db3 | 1564 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1565 | if (ret < 0) |
1566 | goto error; | |
1567 | return put_u64(ts, arg); | |
1568 | } | |
1569 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1570 | { | |
1571 | uint64_t ed; | |
1572 | ||
dd5a0db3 | 1573 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1574 | if (ret < 0) |
1575 | goto error; | |
1576 | return put_u64(ed, arg); | |
1577 | } | |
1578 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1579 | { | |
1580 | uint64_t cs; | |
1581 | ||
dd5a0db3 | 1582 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1583 | if (ret < 0) |
1584 | goto error; | |
1585 | return put_u64(cs, arg); | |
1586 | } | |
1587 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1588 | { | |
1589 | uint64_t ps; | |
1590 | ||
dd5a0db3 | 1591 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1592 | if (ret < 0) |
1593 | goto error; | |
1594 | return put_u64(ps, arg); | |
1595 | } | |
1596 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1597 | { | |
1598 | uint64_t si; | |
1599 | ||
dd5a0db3 | 1600 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1601 | if (ret < 0) |
1602 | goto error; | |
1603 | return put_u64(si, arg); | |
1604 | } | |
2348ca17 JD |
1605 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1606 | { | |
1607 | uint64_t ts; | |
1608 | ||
dd5a0db3 | 1609 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1610 | if (ret < 0) |
1611 | goto error; | |
1612 | return put_u64(ts, arg); | |
1613 | } | |
5b3cf4f9 JD |
1614 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1615 | { | |
1616 | uint64_t seq; | |
1617 | ||
1618 | ret = ops->sequence_number(config, buf, &seq); | |
1619 | if (ret < 0) | |
1620 | goto error; | |
1621 | return put_u64(seq, arg); | |
1622 | } | |
5594698f JD |
1623 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1624 | { | |
1625 | uint64_t id; | |
1626 | ||
1627 | ret = ops->instance_id(config, buf, &id); | |
1628 | if (ret < 0) | |
1629 | goto error; | |
1630 | return put_u64(id, arg); | |
1631 | } | |
3b731ab1 JD |
1632 | default: |
1633 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1634 | cmd, arg); | |
ed8d02d6 | 1635 | } |
3b731ab1 JD |
1636 | |
1637 | error: | |
1638 | return -ENOSYS; | |
ed8d02d6 JD |
1639 | } |
1640 | ||
1641 | #ifdef CONFIG_COMPAT | |
1642 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1643 | unsigned int cmd, unsigned long arg) | |
1644 | { | |
3b731ab1 JD |
1645 | struct lib_ring_buffer *buf = filp->private_data; |
1646 | struct channel *chan = buf->backend.chan; | |
1647 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1648 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1649 | int ret; |
1650 | ||
1651 | if (atomic_read(&chan->record_disabled)) | |
1652 | return -EIO; | |
1653 | ||
ed8d02d6 | 1654 | switch (cmd) { |
3b731ab1 JD |
1655 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1656 | { | |
1657 | uint64_t ts; | |
1658 | ||
dd5a0db3 | 1659 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1660 | if (ret < 0) |
1661 | goto error; | |
1662 | return put_u64(ts, arg); | |
1663 | } | |
1664 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1665 | { | |
1666 | uint64_t ts; | |
1667 | ||
dd5a0db3 | 1668 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1669 | if (ret < 0) |
1670 | goto error; | |
1671 | return put_u64(ts, arg); | |
1672 | } | |
1673 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1674 | { | |
1675 | uint64_t ed; | |
1676 | ||
dd5a0db3 | 1677 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1678 | if (ret < 0) |
1679 | goto error; | |
1680 | return put_u64(ed, arg); | |
ed8d02d6 | 1681 | } |
3b731ab1 JD |
1682 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1683 | { | |
1684 | uint64_t cs; | |
1685 | ||
dd5a0db3 | 1686 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1687 | if (ret < 0) |
1688 | goto error; | |
1689 | return put_u64(cs, arg); | |
1690 | } | |
1691 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1692 | { | |
1693 | uint64_t ps; | |
1694 | ||
dd5a0db3 | 1695 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1696 | if (ret < 0) |
1697 | goto error; | |
1698 | return put_u64(ps, arg); | |
1699 | } | |
1700 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1701 | { | |
1702 | uint64_t si; | |
1703 | ||
dd5a0db3 | 1704 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1705 | if (ret < 0) |
1706 | goto error; | |
1707 | return put_u64(si, arg); | |
1708 | } | |
2348ca17 JD |
1709 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1710 | { | |
1711 | uint64_t ts; | |
1712 | ||
dd5a0db3 | 1713 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1714 | if (ret < 0) |
1715 | goto error; | |
1716 | return put_u64(ts, arg); | |
1717 | } | |
5b3cf4f9 JD |
1718 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
1719 | { | |
1720 | uint64_t seq; | |
1721 | ||
1722 | ret = ops->sequence_number(config, buf, &seq); | |
1723 | if (ret < 0) | |
1724 | goto error; | |
1725 | return put_u64(seq, arg); | |
1726 | } | |
5594698f JD |
1727 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
1728 | { | |
1729 | uint64_t id; | |
1730 | ||
1731 | ret = ops->instance_id(config, buf, &id); | |
1732 | if (ret < 0) | |
1733 | goto error; | |
1734 | return put_u64(id, arg); | |
1735 | } | |
3b731ab1 JD |
1736 | default: |
1737 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1738 | cmd, arg); | |
1739 | } | |
1740 | ||
1741 | error: | |
1742 | return -ENOSYS; | |
ed8d02d6 JD |
1743 | } |
1744 | #endif /* CONFIG_COMPAT */ | |
1745 | ||
1746 | static void lttng_stream_override_ring_buffer_fops(void) | |
1747 | { | |
1748 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1749 | lttng_stream_ring_buffer_file_operations.open = | |
1750 | lib_ring_buffer_file_operations.open; | |
1751 | lttng_stream_ring_buffer_file_operations.release = | |
1752 | lib_ring_buffer_file_operations.release; | |
1753 | lttng_stream_ring_buffer_file_operations.poll = | |
1754 | lib_ring_buffer_file_operations.poll; | |
1755 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1756 | lib_ring_buffer_file_operations.splice_read; | |
1757 | lttng_stream_ring_buffer_file_operations.mmap = | |
1758 | lib_ring_buffer_file_operations.mmap; | |
1759 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1760 | lttng_stream_ring_buffer_ioctl; | |
1761 | lttng_stream_ring_buffer_file_operations.llseek = | |
1762 | lib_ring_buffer_file_operations.llseek; | |
1763 | #ifdef CONFIG_COMPAT | |
1764 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1765 | lttng_stream_ring_buffer_compat_ioctl; | |
1766 | #endif | |
1767 | } | |
1768 | ||
80996790 | 1769 | int __init lttng_abi_init(void) |
baf20995 MD |
1770 | { |
1771 | int ret = 0; | |
1772 | ||
6d2a620c | 1773 | wrapper_vmalloc_sync_all(); |
2754583e | 1774 | lttng_clock_ref(); |
f771eda6 JD |
1775 | |
1776 | ret = lttng_tp_mempool_init(); | |
1777 | if (ret) { | |
1778 | goto error; | |
1779 | } | |
1780 | ||
d29348f7 | 1781 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 | 1782 | <tng_fops, NULL); |
2470a237 | 1783 | |
255e52a4 | 1784 | if (!lttng_proc_dentry) { |
baf20995 MD |
1785 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1786 | ret = -ENOMEM; | |
1787 | goto error; | |
1788 | } | |
ed8d02d6 | 1789 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 1790 | return 0; |
ed8d02d6 | 1791 | |
baf20995 | 1792 | error: |
f771eda6 | 1793 | lttng_tp_mempool_destroy(); |
2754583e | 1794 | lttng_clock_unref(); |
baf20995 MD |
1795 | return ret; |
1796 | } | |
1797 | ||
e6e65fcd MD |
1798 | /* No __exit annotation because used by init error path too. */ |
1799 | void lttng_abi_exit(void) | |
baf20995 | 1800 | { |
f771eda6 | 1801 | lttng_tp_mempool_destroy(); |
2754583e | 1802 | lttng_clock_unref(); |
e6a17f26 MD |
1803 | if (lttng_proc_dentry) |
1804 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1805 | } |