Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
241ae9a8 MD |
33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */ |
34 | #include <wrapper/ringbuffer/vfs.h> | |
35 | #include <wrapper/ringbuffer/backend.h> | |
36 | #include <wrapper/ringbuffer/frontend.h> | |
37 | #include <wrapper/poll.h> | |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
4993071a | 40 | #include <lttng-string-utils.h> |
241ae9a8 MD |
41 | #include <lttng-abi.h> |
42 | #include <lttng-abi-old.h> | |
43 | #include <lttng-events.h> | |
44 | #include <lttng-tracer.h> | |
f771eda6 | 45 | #include <lttng-tp-mempool.h> |
241ae9a8 | 46 | #include <lib/ringbuffer/frontend_types.h> |
63629d86 | 47 | #include <lib/ringbuffer/iterator.h> |
baf20995 MD |
48 | |
49 | /* | |
50 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 51 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
52 | */ |
53 | ||
e6a17f26 | 54 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
55 | |
56 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
57 | static const struct proc_ops lttng_proc_ops; | |
58 | #else | |
59 | static const struct file_operations lttng_proc_ops; | |
60 | #endif | |
61 | ||
ad1c05e1 | 62 | static const struct file_operations lttng_session_fops; |
63629d86 | 63 | static const struct file_operations lttng_trigger_group_fops; |
ad1c05e1 | 64 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 65 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 66 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 67 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 68 | |
9616f0bf JD |
69 | static int put_u64(uint64_t val, unsigned long arg); |
70 | ||
a33c9927 MD |
71 | /* |
72 | * Teardown management: opened file descriptors keep a refcount on the module, | |
73 | * so it can only exit when all file descriptors are closed. | |
74 | */ | |
75 | ||
ad1c05e1 | 76 | static |
baf20995 MD |
77 | int lttng_abi_create_session(void) |
78 | { | |
a90917c3 | 79 | struct lttng_session *session; |
c0e31d2e | 80 | struct file *session_file; |
11b5a3c2 | 81 | int session_fd, ret; |
baf20995 | 82 | |
a90917c3 | 83 | session = lttng_session_create(); |
baf20995 MD |
84 | if (!session) |
85 | return -ENOMEM; | |
4ac10b76 | 86 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
87 | if (session_fd < 0) { |
88 | ret = session_fd; | |
89 | goto fd_error; | |
90 | } | |
c0e31d2e | 91 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 92 | <tng_session_fops, |
baf20995 | 93 | session, O_RDWR); |
c0e31d2e MD |
94 | if (IS_ERR(session_file)) { |
95 | ret = PTR_ERR(session_file); | |
baf20995 MD |
96 | goto file_error; |
97 | } | |
c0e31d2e MD |
98 | session->file = session_file; |
99 | fd_install(session_fd, session_file); | |
baf20995 MD |
100 | return session_fd; |
101 | ||
102 | file_error: | |
103 | put_unused_fd(session_fd); | |
104 | fd_error: | |
a90917c3 | 105 | lttng_session_destroy(session); |
baf20995 MD |
106 | return ret; |
107 | } | |
108 | ||
63629d86 FD |
109 | static |
110 | void trigger_send_notification_work_wakeup(struct irq_work *entry) | |
111 | { | |
112 | struct lttng_trigger_group *trigger_group = container_of(entry, | |
113 | struct lttng_trigger_group, wakeup_pending); | |
114 | wake_up_interruptible(&trigger_group->read_wait); | |
115 | } | |
116 | ||
117 | static | |
118 | int lttng_abi_create_trigger_group(void) | |
119 | { | |
120 | struct lttng_trigger_group *trigger_group; | |
121 | struct file *trigger_group_file; | |
122 | int trigger_group_fd, ret; | |
123 | ||
124 | trigger_group = lttng_trigger_group_create(); | |
125 | if (!trigger_group) | |
126 | return -ENOMEM; | |
127 | ||
128 | trigger_group_fd = lttng_get_unused_fd(); | |
129 | if (trigger_group_fd < 0) { | |
130 | ret = trigger_group_fd; | |
131 | goto fd_error; | |
132 | } | |
133 | trigger_group_file = anon_inode_getfile("[lttng_trigger_group]", | |
134 | <tng_trigger_group_fops, | |
135 | trigger_group, O_RDWR); | |
136 | if (IS_ERR(trigger_group_file)) { | |
137 | ret = PTR_ERR(trigger_group_file); | |
138 | goto file_error; | |
139 | } | |
140 | ||
141 | trigger_group->file = trigger_group_file; | |
142 | init_waitqueue_head(&trigger_group->read_wait); | |
143 | init_irq_work(&trigger_group->wakeup_pending, | |
144 | trigger_send_notification_work_wakeup); | |
145 | fd_install(trigger_group_fd, trigger_group_file); | |
146 | return trigger_group_fd; | |
147 | ||
148 | file_error: | |
149 | put_unused_fd(trigger_group_fd); | |
150 | fd_error: | |
151 | lttng_trigger_group_destroy(trigger_group); | |
152 | return ret; | |
153 | } | |
154 | ||
271b6681 MD |
155 | static |
156 | int lttng_abi_tracepoint_list(void) | |
157 | { | |
158 | struct file *tracepoint_list_file; | |
159 | int file_fd, ret; | |
160 | ||
4ac10b76 | 161 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
162 | if (file_fd < 0) { |
163 | ret = file_fd; | |
164 | goto fd_error; | |
165 | } | |
30f18bf0 | 166 | |
8ee099b6 | 167 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
168 | <tng_tracepoint_list_fops, |
169 | NULL, O_RDWR); | |
170 | if (IS_ERR(tracepoint_list_file)) { | |
171 | ret = PTR_ERR(tracepoint_list_file); | |
172 | goto file_error; | |
173 | } | |
30f18bf0 MD |
174 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
175 | if (ret < 0) | |
176 | goto open_error; | |
271b6681 MD |
177 | fd_install(file_fd, tracepoint_list_file); |
178 | return file_fd; | |
179 | ||
30f18bf0 MD |
180 | open_error: |
181 | fput(tracepoint_list_file); | |
271b6681 MD |
182 | file_error: |
183 | put_unused_fd(file_fd); | |
184 | fd_error: | |
185 | return ret; | |
186 | } | |
187 | ||
f127e61e MD |
188 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
189 | static inline | |
190 | int lttng_abi_syscall_list(void) | |
191 | { | |
192 | return -ENOSYS; | |
193 | } | |
194 | #else | |
195 | static | |
196 | int lttng_abi_syscall_list(void) | |
197 | { | |
198 | struct file *syscall_list_file; | |
199 | int file_fd, ret; | |
200 | ||
201 | file_fd = lttng_get_unused_fd(); | |
202 | if (file_fd < 0) { | |
203 | ret = file_fd; | |
204 | goto fd_error; | |
205 | } | |
206 | ||
207 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
208 | <tng_syscall_list_fops, | |
209 | NULL, O_RDWR); | |
210 | if (IS_ERR(syscall_list_file)) { | |
211 | ret = PTR_ERR(syscall_list_file); | |
212 | goto file_error; | |
213 | } | |
214 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
215 | if (ret < 0) | |
216 | goto open_error; | |
217 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
218 | return file_fd; |
219 | ||
220 | open_error: | |
221 | fput(syscall_list_file); | |
222 | file_error: | |
223 | put_unused_fd(file_fd); | |
224 | fd_error: | |
225 | return ret; | |
226 | } | |
227 | #endif | |
228 | ||
80c16bcf | 229 | static |
6dccd6c1 | 230 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 231 | { |
6dccd6c1 JD |
232 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
233 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
234 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
235 | } |
236 | ||
42cabb80 MD |
237 | static |
238 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
239 | { | |
240 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
241 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
242 | } | |
243 | ||
8070f5c0 MD |
244 | static |
245 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 246 | struct lttng_kernel_context *context_param, |
a90917c3 | 247 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 248 | { |
8070f5c0 MD |
249 | |
250 | if (session->been_active) | |
251 | return -EPERM; | |
252 | ||
6dccd6c1 | 253 | switch (context_param->ctx) { |
12a313a5 | 254 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 255 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
256 | case LTTNG_KERNEL_CONTEXT_PRIO: |
257 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
258 | case LTTNG_KERNEL_CONTEXT_NICE: |
259 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
260 | case LTTNG_KERNEL_CONTEXT_VPID: |
261 | return lttng_add_vpid_to_ctx(ctx); | |
262 | case LTTNG_KERNEL_CONTEXT_TID: | |
263 | return lttng_add_tid_to_ctx(ctx); | |
264 | case LTTNG_KERNEL_CONTEXT_VTID: | |
265 | return lttng_add_vtid_to_ctx(ctx); | |
266 | case LTTNG_KERNEL_CONTEXT_PPID: | |
267 | return lttng_add_ppid_to_ctx(ctx); | |
268 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
269 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 270 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
271 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
272 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
273 | context_param->u.perf_counter.config, | |
274 | context_param->u.perf_counter.name, | |
c24a0d71 | 275 | ctx); |
a2563e83 MD |
276 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
277 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
278 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
279 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
280 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
281 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
282 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
283 | return lttng_add_interruptible_to_ctx(ctx); | |
284 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
285 | return lttng_add_need_reschedule_to_ctx(ctx); | |
286 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
287 | return lttng_add_preemptible_to_ctx(ctx); | |
288 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
289 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
290 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
291 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
292 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
293 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
294 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
295 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
296 | return lttng_add_ipc_ns_to_ctx(ctx); | |
297 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
298 | return lttng_add_mnt_ns_to_ctx(ctx); | |
299 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
300 | return lttng_add_net_ns_to_ctx(ctx); | |
301 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
302 | return lttng_add_pid_ns_to_ctx(ctx); | |
303 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
304 | return lttng_add_user_ns_to_ctx(ctx); | |
305 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
306 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
307 | case LTTNG_KERNEL_CONTEXT_UID: |
308 | return lttng_add_uid_to_ctx(ctx); | |
309 | case LTTNG_KERNEL_CONTEXT_EUID: | |
310 | return lttng_add_euid_to_ctx(ctx); | |
311 | case LTTNG_KERNEL_CONTEXT_SUID: | |
312 | return lttng_add_suid_to_ctx(ctx); | |
313 | case LTTNG_KERNEL_CONTEXT_GID: | |
314 | return lttng_add_gid_to_ctx(ctx); | |
315 | case LTTNG_KERNEL_CONTEXT_EGID: | |
316 | return lttng_add_egid_to_ctx(ctx); | |
317 | case LTTNG_KERNEL_CONTEXT_SGID: | |
318 | return lttng_add_sgid_to_ctx(ctx); | |
319 | case LTTNG_KERNEL_CONTEXT_VUID: | |
320 | return lttng_add_vuid_to_ctx(ctx); | |
321 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
322 | return lttng_add_veuid_to_ctx(ctx); | |
323 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
324 | return lttng_add_vsuid_to_ctx(ctx); | |
325 | case LTTNG_KERNEL_CONTEXT_VGID: | |
326 | return lttng_add_vgid_to_ctx(ctx); | |
327 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
328 | return lttng_add_vegid_to_ctx(ctx); | |
329 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
330 | return lttng_add_vsgid_to_ctx(ctx); | |
8070f5c0 MD |
331 | default: |
332 | return -EINVAL; | |
333 | } | |
334 | } | |
335 | ||
ad1c05e1 MD |
336 | /** |
337 | * lttng_ioctl - lttng syscall through ioctl | |
338 | * | |
c0e31d2e | 339 | * @file: the file |
ad1c05e1 MD |
340 | * @cmd: the command |
341 | * @arg: command arg | |
342 | * | |
343 | * This ioctl implements lttng commands: | |
38d024ae | 344 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 345 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
346 | * LTTNG_KERNEL_TRACER_VERSION |
347 | * Returns the LTTng kernel tracer version | |
348 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
349 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
350 | * LTTNG_KERNEL_WAIT_QUIESCENT |
351 | * Returns after all previously running probes have completed | |
42cabb80 MD |
352 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
353 | * Returns the LTTng kernel tracer ABI version | |
63629d86 FD |
354 | * LTTNG_KERNEL_TRIGGER_GROUP_CREATE |
355 | * Returns a LTTng trigger group file descriptor | |
ad1c05e1 MD |
356 | * |
357 | * The returned session will be deleted when its file descriptor is closed. | |
358 | */ | |
359 | static | |
c0e31d2e | 360 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
361 | { |
362 | switch (cmd) { | |
6dccd6c1 | 363 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 364 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 365 | return lttng_abi_create_session(); |
63629d86 FD |
366 | case LTTNG_KERNEL_TRIGGER_GROUP_CREATE: |
367 | return lttng_abi_create_trigger_group(); | |
6dccd6c1 JD |
368 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
369 | { | |
370 | struct lttng_kernel_tracer_version v; | |
371 | struct lttng_kernel_old_tracer_version oldv; | |
372 | struct lttng_kernel_old_tracer_version *uversion = | |
373 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
374 | ||
375 | lttng_abi_tracer_version(&v); | |
376 | oldv.major = v.major; | |
377 | oldv.minor = v.minor; | |
378 | oldv.patchlevel = v.patchlevel; | |
379 | ||
380 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
381 | return -EFAULT; | |
382 | return 0; | |
383 | } | |
80c16bcf | 384 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
385 | { |
386 | struct lttng_kernel_tracer_version version; | |
387 | struct lttng_kernel_tracer_version *uversion = | |
388 | (struct lttng_kernel_tracer_version __user *) arg; | |
389 | ||
390 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
391 | |
392 | if (copy_to_user(uversion, &version, sizeof(version))) | |
393 | return -EFAULT; | |
394 | return 0; | |
395 | } | |
396 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
397 | { | |
398 | struct lttng_kernel_tracer_abi_version version; | |
399 | struct lttng_kernel_tracer_abi_version *uversion = | |
400 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
401 | ||
402 | lttng_abi_tracer_abi_version(&version); | |
403 | ||
6dccd6c1 JD |
404 | if (copy_to_user(uversion, &version, sizeof(version))) |
405 | return -EFAULT; | |
406 | return 0; | |
407 | } | |
408 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
409 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
410 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
411 | case LTTNG_KERNEL_SYSCALL_LIST: |
412 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 413 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
414 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
415 | synchronize_trace(); | |
416 | return 0; | |
6dccd6c1 JD |
417 | case LTTNG_KERNEL_OLD_CALIBRATE: |
418 | { | |
419 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
420 | (struct lttng_kernel_old_calibrate __user *) arg; | |
421 | struct lttng_kernel_old_calibrate old_calibrate; | |
422 | struct lttng_kernel_calibrate calibrate; | |
423 | int ret; | |
424 | ||
425 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
426 | return -EFAULT; | |
427 | calibrate.type = old_calibrate.type; | |
428 | ret = lttng_calibrate(&calibrate); | |
429 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
430 | return -EFAULT; | |
431 | return ret; | |
432 | } | |
57105fc2 MD |
433 | case LTTNG_KERNEL_CALIBRATE: |
434 | { | |
3db41b2c MD |
435 | struct lttng_kernel_calibrate __user *ucalibrate = |
436 | (struct lttng_kernel_calibrate __user *) arg; | |
437 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
438 | int ret; |
439 | ||
440 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
441 | return -EFAULT; | |
442 | ret = lttng_calibrate(&calibrate); | |
443 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
444 | return -EFAULT; | |
445 | return ret; | |
446 | } | |
ad1c05e1 MD |
447 | default: |
448 | return -ENOIOCTLCMD; | |
449 | } | |
450 | } | |
451 | ||
059de147 MJ |
452 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
453 | static const struct proc_ops lttng_proc_ops = { | |
454 | .proc_ioctl = lttng_ioctl, | |
455 | #ifdef CONFIG_COMPAT | |
456 | .proc_compat_ioctl = lttng_ioctl, | |
457 | #endif /* CONFIG_COMPAT */ | |
458 | }; | |
459 | #else | |
460 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 461 | .owner = THIS_MODULE, |
ad1c05e1 MD |
462 | .unlocked_ioctl = lttng_ioctl, |
463 | #ifdef CONFIG_COMPAT | |
03037b98 | 464 | .compat_ioctl = lttng_ioctl, |
059de147 | 465 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 466 | }; |
059de147 | 467 | #endif |
ad1c05e1 | 468 | |
5dbbdb43 | 469 | static |
c0e31d2e | 470 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 471 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 472 | enum channel_type channel_type) |
baf20995 | 473 | { |
a90917c3 | 474 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 475 | const struct file_operations *fops = NULL; |
5dbbdb43 | 476 | const char *transport_name; |
a90917c3 | 477 | struct lttng_channel *chan; |
c0e31d2e | 478 | struct file *chan_file; |
baf20995 | 479 | int chan_fd; |
ad1c05e1 | 480 | int ret = 0; |
baf20995 | 481 | |
4ac10b76 | 482 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
483 | if (chan_fd < 0) { |
484 | ret = chan_fd; | |
485 | goto fd_error; | |
486 | } | |
88dfd899 MD |
487 | switch (channel_type) { |
488 | case PER_CPU_CHANNEL: | |
489 | fops = <tng_channel_fops; | |
490 | break; | |
491 | case METADATA_CHANNEL: | |
492 | fops = <tng_metadata_fops; | |
493 | break; | |
494 | } | |
2470a237 | 495 | |
c0e31d2e | 496 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 497 | fops, |
03037b98 | 498 | NULL, O_RDWR); |
c0e31d2e MD |
499 | if (IS_ERR(chan_file)) { |
500 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
501 | goto file_error; |
502 | } | |
5dbbdb43 MD |
503 | switch (channel_type) { |
504 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
505 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
506 | transport_name = chan_param->overwrite ? | |
96ba7208 | 507 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
508 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
509 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
510 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
511 | } else { | |
512 | return -EINVAL; | |
513 | } | |
5dbbdb43 | 514 | break; |
5dbbdb43 | 515 | case METADATA_CHANNEL: |
6dccd6c1 | 516 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 517 | transport_name = "relay-metadata"; |
6dccd6c1 | 518 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
519 | transport_name = "relay-metadata-mmap"; |
520 | else | |
521 | return -EINVAL; | |
5dbbdb43 MD |
522 | break; |
523 | default: | |
524 | transport_name = "<unknown>"; | |
525 | break; | |
526 | } | |
98d7281c MJ |
527 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
528 | ret = -EOVERFLOW; | |
9c1f4643 MD |
529 | goto refcount_error; |
530 | } | |
03037b98 MD |
531 | /* |
532 | * We tolerate no failure path after channel creation. It will stay | |
533 | * invariant for the rest of the session. | |
534 | */ | |
a90917c3 | 535 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
536 | chan_param->subbuf_size, |
537 | chan_param->num_subbuf, | |
538 | chan_param->switch_timer_interval, | |
d83004aa JD |
539 | chan_param->read_timer_interval, |
540 | channel_type); | |
03037b98 | 541 | if (!chan) { |
f3d01b96 | 542 | ret = -EINVAL; |
03037b98 MD |
543 | goto chan_error; |
544 | } | |
11b5a3c2 | 545 | chan->file = chan_file; |
c0e31d2e MD |
546 | chan_file->private_data = chan; |
547 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 548 | |
baf20995 MD |
549 | return chan_fd; |
550 | ||
03037b98 | 551 | chan_error: |
9c1f4643 MD |
552 | atomic_long_dec(&session_file->f_count); |
553 | refcount_error: | |
c0e31d2e | 554 | fput(chan_file); |
baf20995 MD |
555 | file_error: |
556 | put_unused_fd(chan_fd); | |
557 | fd_error: | |
baf20995 MD |
558 | return ret; |
559 | } | |
560 | ||
7f859fbf JR |
561 | static |
562 | int lttng_abi_session_set_name(struct lttng_session *session, | |
563 | struct lttng_kernel_session_name *name) | |
564 | { | |
565 | size_t len; | |
566 | ||
567 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
568 | ||
569 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
570 | /* Name is too long/malformed */ | |
571 | return -EINVAL; | |
572 | } | |
573 | ||
574 | strcpy(session->name, name->name); | |
575 | return 0; | |
576 | } | |
577 | ||
1c88f269 JR |
578 | static |
579 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
580 | struct lttng_kernel_session_creation_time *time) | |
581 | { | |
582 | size_t len; | |
583 | ||
584 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
585 | ||
586 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
587 | /* Time is too long/malformed */ | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | strcpy(session->creation_time, time->iso8601); | |
592 | return 0; | |
593 | } | |
594 | ||
d1f652f8 MD |
595 | static |
596 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
597 | { | |
598 | switch (tracker->type) { | |
599 | case LTTNG_KERNEL_TRACKER_PID: | |
600 | return TRACKER_PID; | |
601 | case LTTNG_KERNEL_TRACKER_VPID: | |
602 | return TRACKER_VPID; | |
603 | case LTTNG_KERNEL_TRACKER_UID: | |
604 | return TRACKER_UID; | |
605 | case LTTNG_KERNEL_TRACKER_VUID: | |
606 | return TRACKER_VUID; | |
607 | case LTTNG_KERNEL_TRACKER_GID: | |
608 | return TRACKER_GID; | |
609 | case LTTNG_KERNEL_TRACKER_VGID: | |
610 | return TRACKER_VGID; | |
611 | default: | |
612 | return TRACKER_UNKNOWN; | |
613 | } | |
614 | } | |
615 | ||
baf20995 | 616 | /** |
ad1c05e1 | 617 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 618 | * |
c0e31d2e | 619 | * @file: the file |
baf20995 MD |
620 | * @cmd: the command |
621 | * @arg: command arg | |
622 | * | |
623 | * This ioctl implements lttng commands: | |
38d024ae | 624 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 625 | * Returns a LTTng channel file descriptor |
e64957da MD |
626 | * LTTNG_KERNEL_ENABLE |
627 | * Enables tracing for a session (weak enable) | |
628 | * LTTNG_KERNEL_DISABLE | |
629 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
630 | * LTTNG_KERNEL_METADATA |
631 | * Returns a LTTng metadata file descriptor | |
e0130fab | 632 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 633 | * Add PID to session PID tracker |
e0130fab | 634 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
635 | * Remove PID from session PID tracker |
636 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
637 | * Add ID to tracker | |
638 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
639 | * Remove ID from tracker | |
ad1c05e1 MD |
640 | * |
641 | * The returned channel will be deleted when its file descriptor is closed. | |
642 | */ | |
643 | static | |
c0e31d2e | 644 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 645 | { |
a90917c3 | 646 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
647 | struct lttng_kernel_channel chan_param; |
648 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 649 | |
ad1c05e1 | 650 | switch (cmd) { |
6dccd6c1 JD |
651 | case LTTNG_KERNEL_OLD_CHANNEL: |
652 | { | |
6dccd6c1 JD |
653 | if (copy_from_user(&old_chan_param, |
654 | (struct lttng_kernel_old_channel __user *) arg, | |
655 | sizeof(struct lttng_kernel_old_channel))) | |
656 | return -EFAULT; | |
657 | chan_param.overwrite = old_chan_param.overwrite; | |
658 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
659 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
660 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
661 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
662 | chan_param.output = old_chan_param.output; | |
663 | ||
664 | return lttng_abi_create_channel(file, &chan_param, | |
665 | PER_CPU_CHANNEL); | |
666 | } | |
38d024ae | 667 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 668 | { |
6dccd6c1 | 669 | if (copy_from_user(&chan_param, |
38d024ae | 670 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
671 | sizeof(struct lttng_kernel_channel))) |
672 | return -EFAULT; | |
673 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 674 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
675 | } |
676 | case LTTNG_KERNEL_OLD_SESSION_START: | |
677 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 678 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 679 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 680 | return lttng_session_enable(session); |
6dccd6c1 JD |
681 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
682 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 683 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 684 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 685 | return lttng_session_disable(session); |
6dccd6c1 JD |
686 | case LTTNG_KERNEL_OLD_METADATA: |
687 | { | |
6dccd6c1 JD |
688 | if (copy_from_user(&old_chan_param, |
689 | (struct lttng_kernel_old_channel __user *) arg, | |
690 | sizeof(struct lttng_kernel_old_channel))) | |
691 | return -EFAULT; | |
692 | chan_param.overwrite = old_chan_param.overwrite; | |
693 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
694 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
695 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
696 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
697 | chan_param.output = old_chan_param.output; | |
698 | ||
699 | return lttng_abi_create_channel(file, &chan_param, | |
700 | METADATA_CHANNEL); | |
701 | } | |
38d024ae | 702 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 703 | { |
6dccd6c1 JD |
704 | if (copy_from_user(&chan_param, |
705 | (struct lttng_kernel_channel __user *) arg, | |
706 | sizeof(struct lttng_kernel_channel))) | |
707 | return -EFAULT; | |
708 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 709 | METADATA_CHANNEL); |
6dccd6c1 | 710 | } |
e0130fab | 711 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 712 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 713 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
714 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
715 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
716 | { | |
717 | struct lttng_kernel_tracker_args tracker; | |
718 | enum tracker_type tracker_type; | |
719 | ||
720 | if (copy_from_user(&tracker, | |
721 | (struct lttng_kernel_tracker_args __user *) arg, | |
722 | sizeof(struct lttng_kernel_tracker_args))) | |
723 | return -EFAULT; | |
724 | tracker_type = get_tracker_type(&tracker); | |
725 | if (tracker_type == TRACKER_UNKNOWN) | |
726 | return -EINVAL; | |
727 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
728 | } | |
729 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
730 | { | |
731 | struct lttng_kernel_tracker_args tracker; | |
732 | enum tracker_type tracker_type; | |
733 | ||
734 | if (copy_from_user(&tracker, | |
735 | (struct lttng_kernel_tracker_args __user *) arg, | |
736 | sizeof(struct lttng_kernel_tracker_args))) | |
737 | return -EFAULT; | |
738 | tracker_type = get_tracker_type(&tracker); | |
739 | if (tracker_type == TRACKER_UNKNOWN) | |
740 | return -EINVAL; | |
741 | return lttng_session_untrack_id(session, tracker_type, | |
742 | tracker.id); | |
743 | } | |
7e6f9ef6 | 744 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
745 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
746 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
747 | { | |
748 | struct lttng_kernel_tracker_args tracker; | |
749 | enum tracker_type tracker_type; | |
750 | ||
751 | if (copy_from_user(&tracker, | |
752 | (struct lttng_kernel_tracker_args __user *) arg, | |
753 | sizeof(struct lttng_kernel_tracker_args))) | |
754 | return -EFAULT; | |
755 | tracker_type = get_tracker_type(&tracker); | |
756 | if (tracker_type == TRACKER_UNKNOWN) | |
757 | return -EINVAL; | |
758 | return lttng_session_list_tracker_ids(session, tracker_type); | |
759 | } | |
9616f0bf JD |
760 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
761 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
762 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
763 | return lttng_session_statedump(session); | |
7f859fbf JR |
764 | case LTTNG_KERNEL_SESSION_SET_NAME: |
765 | { | |
766 | struct lttng_kernel_session_name name; | |
767 | ||
768 | if (copy_from_user(&name, | |
769 | (struct lttng_kernel_session_name __user *) arg, | |
770 | sizeof(struct lttng_kernel_session_name))) | |
771 | return -EFAULT; | |
772 | return lttng_abi_session_set_name(session, &name); | |
773 | } | |
1c88f269 JR |
774 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
775 | { | |
776 | struct lttng_kernel_session_creation_time time; | |
777 | ||
778 | if (copy_from_user(&time, | |
779 | (struct lttng_kernel_session_creation_time __user *) arg, | |
780 | sizeof(struct lttng_kernel_session_creation_time))) | |
781 | return -EFAULT; | |
782 | return lttng_abi_session_set_creation_time(session, &time); | |
783 | } | |
ad1c05e1 MD |
784 | default: |
785 | return -ENOIOCTLCMD; | |
786 | } | |
787 | } | |
788 | ||
03037b98 MD |
789 | /* |
790 | * Called when the last file reference is dropped. | |
791 | * | |
792 | * Big fat note: channels and events are invariant for the whole session after | |
793 | * their creation. So this session destruction also destroys all channel and | |
794 | * event structures specific to this session (they are not destroyed when their | |
795 | * individual file is released). | |
796 | */ | |
ad1c05e1 | 797 | static |
03037b98 | 798 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 799 | { |
a90917c3 | 800 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
801 | |
802 | if (session) | |
a90917c3 | 803 | lttng_session_destroy(session); |
11b5a3c2 | 804 | return 0; |
ad1c05e1 | 805 | } |
ad1c05e1 MD |
806 | |
807 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 808 | .owner = THIS_MODULE, |
03037b98 | 809 | .release = lttng_session_release, |
ad1c05e1 MD |
810 | .unlocked_ioctl = lttng_session_ioctl, |
811 | #ifdef CONFIG_COMPAT | |
03037b98 | 812 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 813 | #endif |
11b5a3c2 | 814 | }; |
ad1c05e1 | 815 | |
63629d86 FD |
816 | /* |
817 | * When encountering empty buffer, flush current sub-buffer if non-empty | |
818 | * and retry (if new data available to read after flush). | |
819 | */ | |
820 | static | |
821 | ssize_t lttng_trigger_group_notif_read(struct file *filp, char __user *user_buf, | |
822 | size_t count, loff_t *ppos) | |
823 | { | |
824 | struct lttng_trigger_group *trigger_group = filp->private_data; | |
825 | struct channel *chan = trigger_group->chan; | |
826 | struct lib_ring_buffer *buf = trigger_group->buf; | |
827 | ssize_t read_count = 0, len; | |
828 | size_t read_offset; | |
829 | ||
830 | might_sleep(); | |
831 | if (!lttng_access_ok(VERIFY_WRITE, user_buf, count)) | |
832 | return -EFAULT; | |
833 | ||
834 | /* Finish copy of previous record */ | |
835 | if (*ppos != 0) { | |
836 | if (read_count < count) { | |
837 | len = chan->iter.len_left; | |
838 | read_offset = *ppos; | |
839 | goto skip_get_next; | |
840 | } | |
841 | } | |
842 | ||
843 | while (read_count < count) { | |
844 | size_t copy_len, space_left; | |
845 | ||
846 | len = lib_ring_buffer_get_next_record(chan, buf); | |
847 | len_test: | |
848 | if (len < 0) { | |
849 | /* | |
850 | * Check if buffer is finalized (end of file). | |
851 | */ | |
852 | if (len == -ENODATA) { | |
853 | /* A 0 read_count will tell about end of file */ | |
854 | goto nodata; | |
855 | } | |
856 | if (filp->f_flags & O_NONBLOCK) { | |
857 | if (!read_count) | |
858 | read_count = -EAGAIN; | |
859 | goto nodata; | |
860 | } else { | |
861 | int error; | |
862 | ||
863 | /* | |
864 | * No data available at the moment, return what | |
865 | * we got. | |
866 | */ | |
867 | if (read_count) | |
868 | goto nodata; | |
869 | ||
870 | /* | |
871 | * Wait for returned len to be >= 0 or -ENODATA. | |
872 | */ | |
873 | error = wait_event_interruptible( | |
874 | trigger_group->read_wait, | |
875 | ((len = lib_ring_buffer_get_next_record( | |
876 | chan, buf)), len != -EAGAIN)); | |
877 | CHAN_WARN_ON(chan, len == -EBUSY); | |
878 | if (error) { | |
879 | read_count = error; | |
880 | goto nodata; | |
881 | } | |
882 | CHAN_WARN_ON(chan, len < 0 && len != -ENODATA); | |
883 | goto len_test; | |
884 | } | |
885 | } | |
886 | read_offset = buf->iter.read_offset; | |
887 | skip_get_next: | |
888 | space_left = count - read_count; | |
889 | if (len <= space_left) { | |
890 | copy_len = len; | |
891 | chan->iter.len_left = 0; | |
892 | *ppos = 0; | |
893 | } else { | |
894 | copy_len = space_left; | |
895 | chan->iter.len_left = len - copy_len; | |
896 | *ppos = read_offset + copy_len; | |
897 | } | |
898 | if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset, | |
899 | &user_buf[read_count], | |
900 | copy_len)) { | |
901 | /* | |
902 | * Leave the len_left and ppos values at their current | |
903 | * state, as we currently have a valid event to read. | |
904 | */ | |
905 | return -EFAULT; | |
906 | } | |
907 | read_count += copy_len; | |
908 | } | |
909 | goto put_record; | |
910 | ||
911 | nodata: | |
912 | *ppos = 0; | |
913 | chan->iter.len_left = 0; | |
914 | ||
915 | put_record: | |
916 | lib_ring_buffer_put_current_record(buf); | |
917 | return read_count; | |
918 | } | |
919 | ||
920 | /* | |
921 | * If the ring buffer is non empty (even just a partial subbuffer), return that | |
922 | * there is data available. Perform a ring buffer flush if we encounter a | |
923 | * non-empty ring buffer which does not have any consumeable subbuffer available. | |
924 | */ | |
925 | static | |
926 | unsigned int lttng_trigger_group_notif_poll(struct file *filp, | |
927 | poll_table *wait) | |
928 | { | |
929 | unsigned int mask = 0; | |
930 | struct lttng_trigger_group *trigger_group = filp->private_data; | |
931 | struct channel *chan = trigger_group->chan; | |
932 | struct lib_ring_buffer *buf = trigger_group->buf; | |
933 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
934 | int finalized, disabled; | |
935 | unsigned long consumed, offset; | |
936 | size_t subbuffer_header_size = config->cb.subbuffer_header_size(); | |
937 | ||
938 | if (filp->f_mode & FMODE_READ) { | |
939 | poll_wait_set_exclusive(wait); | |
940 | poll_wait(filp, &trigger_group->read_wait, wait); | |
941 | ||
942 | finalized = lib_ring_buffer_is_finalized(config, buf); | |
943 | disabled = lib_ring_buffer_channel_is_disabled(chan); | |
944 | ||
945 | /* | |
946 | * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering | |
947 | * finalized load before offsets loads. | |
948 | */ | |
949 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
950 | retry: | |
951 | if (disabled) | |
952 | return POLLERR; | |
953 | ||
954 | offset = lib_ring_buffer_get_offset(config, buf); | |
955 | consumed = lib_ring_buffer_get_consumed(config, buf); | |
956 | ||
957 | /* | |
958 | * If there is no buffer available to consume. | |
959 | */ | |
960 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) { | |
961 | /* | |
962 | * If there is a non-empty subbuffer, flush and try again. | |
963 | */ | |
964 | if (subbuf_offset(offset, chan) > subbuffer_header_size) { | |
965 | lib_ring_buffer_switch_remote(buf); | |
966 | goto retry; | |
967 | } | |
968 | ||
969 | if (finalized) | |
970 | return POLLHUP; | |
971 | else { | |
972 | /* | |
973 | * The memory barriers | |
974 | * __wait_event()/wake_up_interruptible() take | |
975 | * care of "raw_spin_is_locked" memory ordering. | |
976 | */ | |
977 | if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock)) | |
978 | goto retry; | |
979 | else | |
980 | return 0; | |
981 | } | |
982 | } else { | |
983 | if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) | |
984 | >= chan->backend.buf_size) | |
985 | return POLLPRI | POLLRDBAND; | |
986 | else | |
987 | return POLLIN | POLLRDNORM; | |
988 | } | |
989 | } | |
990 | ||
991 | return mask; | |
992 | } | |
993 | ||
994 | /** | |
995 | * lttng_trigger_group_notif_open - trigger ring buffer open file operation | |
996 | * @inode: opened inode | |
997 | * @file: opened file | |
998 | * | |
999 | * Open implementation. Makes sure only one open instance of a buffer is | |
1000 | * done at a given moment. | |
1001 | */ | |
1002 | static int lttng_trigger_group_notif_open(struct inode *inode, struct file *file) | |
1003 | { | |
1004 | struct lttng_trigger_group *trigger_group = inode->i_private; | |
1005 | struct lib_ring_buffer *buf = trigger_group->buf; | |
1006 | ||
1007 | file->private_data = trigger_group; | |
1008 | return lib_ring_buffer_open(inode, file, buf); | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * lttng_trigger_group_notif_release - trigger ring buffer release file operation | |
1013 | * @inode: opened inode | |
1014 | * @file: opened file | |
1015 | * | |
1016 | * Release implementation. | |
1017 | */ | |
1018 | static int lttng_trigger_group_notif_release(struct inode *inode, struct file *file) | |
1019 | { | |
1020 | struct lttng_trigger_group *trigger_group = file->private_data; | |
1021 | struct lib_ring_buffer *buf = trigger_group->buf; | |
1022 | int ret; | |
1023 | ||
1024 | ret = lib_ring_buffer_release(inode, file, buf); | |
1025 | if (ret) | |
1026 | return ret; | |
1027 | fput(trigger_group->file); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static const struct file_operations lttng_trigger_group_notif_fops = { | |
1032 | .owner = THIS_MODULE, | |
1033 | .open = lttng_trigger_group_notif_open, | |
1034 | .release = lttng_trigger_group_notif_release, | |
1035 | .read = lttng_trigger_group_notif_read, | |
1036 | .poll = lttng_trigger_group_notif_poll, | |
1037 | }; | |
1038 | ||
d83004aa JD |
1039 | /** |
1040 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
1041 | * @filp: the file | |
1042 | * @wait: poll table | |
1043 | * | |
1044 | * Handles the poll operations for the metadata channels. | |
1045 | */ | |
ad1c05e1 | 1046 | static |
d83004aa JD |
1047 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
1048 | poll_table *wait) | |
1049 | { | |
1050 | struct lttng_metadata_stream *stream = filp->private_data; | |
1051 | struct lib_ring_buffer *buf = stream->priv; | |
1052 | int finalized; | |
1053 | unsigned int mask = 0; | |
1054 | ||
1055 | if (filp->f_mode & FMODE_READ) { | |
1056 | poll_wait_set_exclusive(wait); | |
1057 | poll_wait(filp, &stream->read_wait, wait); | |
1058 | ||
1059 | finalized = stream->finalized; | |
1060 | ||
1061 | /* | |
1062 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
1063 | * ordering finalized load before offsets loads. | |
1064 | */ | |
1065 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
1066 | ||
1067 | if (finalized) | |
1068 | mask |= POLLHUP; | |
1069 | ||
92d9f5e6 | 1070 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 1071 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 1072 | stream->metadata_out) |
d83004aa | 1073 | mask |= POLLIN; |
92d9f5e6 | 1074 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
1075 | } |
1076 | ||
1077 | return mask; | |
1078 | } | |
1079 | ||
f613e3e6 MD |
1080 | static |
1081 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
1082 | unsigned int cmd, unsigned long arg) | |
1083 | { | |
1084 | struct lttng_metadata_stream *stream = filp->private_data; | |
1085 | ||
1086 | stream->metadata_out = stream->metadata_in; | |
1087 | } | |
1088 | ||
d1344afa JD |
1089 | /* |
1090 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
1091 | * the consumer receives the content of the metadata cache unchanged. This is | |
1092 | * different from the metadata_regenerate where the offset from epoch is | |
1093 | * resampled, here we want the exact same content as the last time the metadata | |
1094 | * was generated. This command is only possible if all the metadata written | |
1095 | * in the cache has been output to the metadata stream to avoid corrupting the | |
1096 | * metadata file. | |
1097 | * | |
1098 | * Return 0 on success, a negative value on error. | |
1099 | */ | |
1100 | static | |
1101 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
1102 | { | |
1103 | int ret; | |
1104 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
1105 | ||
1106 | mutex_lock(&cache->lock); | |
1107 | if (stream->metadata_out != cache->metadata_written) { | |
1108 | ret = -EBUSY; | |
1109 | goto end; | |
1110 | } | |
1111 | stream->metadata_out = 0; | |
1112 | stream->metadata_in = 0; | |
1113 | wake_up_interruptible(&stream->read_wait); | |
1114 | ret = 0; | |
1115 | ||
1116 | end: | |
1117 | mutex_unlock(&cache->lock); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
d83004aa JD |
1121 | static |
1122 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
1123 | unsigned int cmd, unsigned long arg) | |
1124 | { | |
1125 | int ret; | |
1126 | struct lttng_metadata_stream *stream = filp->private_data; | |
1127 | struct lib_ring_buffer *buf = stream->priv; | |
1128 | ||
1129 | switch (cmd) { | |
d83004aa JD |
1130 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1131 | { | |
35097f36 JD |
1132 | struct lttng_metadata_stream *stream = filp->private_data; |
1133 | struct lib_ring_buffer *buf = stream->priv; | |
1134 | struct channel *chan = buf->backend.chan; | |
1135 | ||
1136 | ret = lttng_metadata_output_channel(stream, chan); | |
1137 | if (ret > 0) { | |
1138 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1139 | ret = 0; | |
1140 | } else if (ret < 0) | |
d83004aa JD |
1141 | goto err; |
1142 | break; | |
1143 | } | |
f613e3e6 MD |
1144 | case RING_BUFFER_GET_SUBBUF: |
1145 | { | |
1146 | /* | |
1147 | * Random access is not allowed for metadata channel. | |
1148 | */ | |
1149 | return -ENOSYS; | |
1150 | } | |
c6f05468 | 1151 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
1152 | case RING_BUFFER_FLUSH: |
1153 | { | |
1154 | struct lttng_metadata_stream *stream = filp->private_data; | |
1155 | struct lib_ring_buffer *buf = stream->priv; | |
1156 | struct channel *chan = buf->backend.chan; | |
1157 | ||
1158 | /* | |
1159 | * Before doing the actual ring buffer flush, write up to one | |
1160 | * packet of metadata in the ring buffer. | |
1161 | */ | |
1162 | ret = lttng_metadata_output_channel(stream, chan); | |
1163 | if (ret < 0) | |
1164 | goto err; | |
1165 | break; | |
1166 | } | |
9616f0bf JD |
1167 | case RING_BUFFER_GET_METADATA_VERSION: |
1168 | { | |
1169 | struct lttng_metadata_stream *stream = filp->private_data; | |
1170 | ||
1171 | return put_u64(stream->version, arg); | |
1172 | } | |
d1344afa JD |
1173 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1174 | { | |
1175 | struct lttng_metadata_stream *stream = filp->private_data; | |
1176 | ||
1177 | return lttng_metadata_cache_dump(stream); | |
1178 | } | |
d83004aa JD |
1179 | default: |
1180 | break; | |
1181 | } | |
f613e3e6 MD |
1182 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1183 | ||
d83004aa | 1184 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
1185 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
1186 | if (ret < 0) | |
1187 | goto err; | |
d83004aa | 1188 | |
f613e3e6 MD |
1189 | switch (cmd) { |
1190 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1191 | { | |
1192 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1193 | cmd, arg); | |
1194 | break; | |
1195 | } | |
1196 | default: | |
1197 | break; | |
1198 | } | |
d83004aa JD |
1199 | err: |
1200 | return ret; | |
1201 | } | |
1202 | ||
aeb9064d | 1203 | #ifdef CONFIG_COMPAT |
d83004aa JD |
1204 | static |
1205 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1206 | unsigned int cmd, unsigned long arg) | |
1207 | { | |
1208 | int ret; | |
1209 | struct lttng_metadata_stream *stream = filp->private_data; | |
1210 | struct lib_ring_buffer *buf = stream->priv; | |
1211 | ||
1212 | switch (cmd) { | |
d83004aa JD |
1213 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1214 | { | |
35097f36 JD |
1215 | struct lttng_metadata_stream *stream = filp->private_data; |
1216 | struct lib_ring_buffer *buf = stream->priv; | |
1217 | struct channel *chan = buf->backend.chan; | |
1218 | ||
1219 | ret = lttng_metadata_output_channel(stream, chan); | |
1220 | if (ret > 0) { | |
1221 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1222 | ret = 0; | |
1223 | } else if (ret < 0) | |
d83004aa JD |
1224 | goto err; |
1225 | break; | |
1226 | } | |
f613e3e6 MD |
1227 | case RING_BUFFER_GET_SUBBUF: |
1228 | { | |
1229 | /* | |
1230 | * Random access is not allowed for metadata channel. | |
1231 | */ | |
1232 | return -ENOSYS; | |
1233 | } | |
c6f05468 | 1234 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1235 | case RING_BUFFER_FLUSH: |
1236 | { | |
1237 | struct lttng_metadata_stream *stream = filp->private_data; | |
1238 | struct lib_ring_buffer *buf = stream->priv; | |
1239 | struct channel *chan = buf->backend.chan; | |
1240 | ||
1241 | /* | |
1242 | * Before doing the actual ring buffer flush, write up to one | |
1243 | * packet of metadata in the ring buffer. | |
1244 | */ | |
1245 | ret = lttng_metadata_output_channel(stream, chan); | |
1246 | if (ret < 0) | |
1247 | goto err; | |
1248 | break; | |
1249 | } | |
1250 | case RING_BUFFER_GET_METADATA_VERSION: | |
1251 | { | |
1252 | struct lttng_metadata_stream *stream = filp->private_data; | |
1253 | ||
1254 | return put_u64(stream->version, arg); | |
1255 | } | |
d1344afa JD |
1256 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1257 | { | |
1258 | struct lttng_metadata_stream *stream = filp->private_data; | |
1259 | ||
1260 | return lttng_metadata_cache_dump(stream); | |
1261 | } | |
d83004aa JD |
1262 | default: |
1263 | break; | |
1264 | } | |
f613e3e6 MD |
1265 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1266 | ||
d83004aa | 1267 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
1268 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
1269 | if (ret < 0) | |
1270 | goto err; | |
d83004aa | 1271 | |
f613e3e6 MD |
1272 | switch (cmd) { |
1273 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1274 | { | |
1275 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1276 | cmd, arg); | |
1277 | break; | |
1278 | } | |
1279 | default: | |
1280 | break; | |
1281 | } | |
d83004aa JD |
1282 | err: |
1283 | return ret; | |
1284 | } | |
aeb9064d | 1285 | #endif |
d83004aa | 1286 | |
b3b8072b MD |
1287 | /* |
1288 | * This is not used by anonymous file descriptors. This code is left | |
1289 | * there if we ever want to implement an inode with open() operation. | |
1290 | */ | |
d83004aa JD |
1291 | static |
1292 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1293 | { | |
1294 | struct lttng_metadata_stream *stream = inode->i_private; | |
1295 | struct lib_ring_buffer *buf = stream->priv; | |
1296 | ||
1297 | file->private_data = buf; | |
b3b8072b MD |
1298 | /* |
1299 | * Since life-time of metadata cache differs from that of | |
1300 | * session, we need to keep our own reference on the transport. | |
1301 | */ | |
1302 | if (!try_module_get(stream->transport->owner)) { | |
1303 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1304 | return -EBUSY; | |
1305 | } | |
d83004aa JD |
1306 | return lib_ring_buffer_open(inode, file, buf); |
1307 | } | |
1308 | ||
1309 | static | |
1310 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1311 | { | |
1312 | struct lttng_metadata_stream *stream = file->private_data; | |
1313 | struct lib_ring_buffer *buf = stream->priv; | |
1314 | ||
1315 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 1316 | module_put(stream->transport->owner); |
d83004aa JD |
1317 | return lib_ring_buffer_release(inode, file, buf); |
1318 | } | |
1319 | ||
1320 | static | |
1321 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1322 | struct pipe_inode_info *pipe, size_t len, | |
1323 | unsigned int flags) | |
1324 | { | |
1325 | struct lttng_metadata_stream *stream = in->private_data; | |
1326 | struct lib_ring_buffer *buf = stream->priv; | |
1327 | ||
1328 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1329 | flags, buf); | |
1330 | } | |
1331 | ||
1332 | static | |
1333 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1334 | struct vm_area_struct *vma) | |
1335 | { | |
1336 | struct lttng_metadata_stream *stream = filp->private_data; | |
1337 | struct lib_ring_buffer *buf = stream->priv; | |
1338 | ||
1339 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1340 | } | |
1341 | ||
1342 | static | |
1343 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1344 | .owner = THIS_MODULE, | |
1345 | .open = lttng_metadata_ring_buffer_open, | |
1346 | .release = lttng_metadata_ring_buffer_release, | |
1347 | .poll = lttng_metadata_ring_buffer_poll, | |
1348 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1349 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1350 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1351 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1352 | #ifdef CONFIG_COMPAT | |
1353 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1354 | #endif | |
1355 | }; | |
1356 | ||
1357 | static | |
1358 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
63629d86 | 1359 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1360 | { |
ad1c05e1 | 1361 | int stream_fd, ret; |
11b5a3c2 | 1362 | struct file *stream_file; |
ad1c05e1 | 1363 | |
4ac10b76 | 1364 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1365 | if (stream_fd < 0) { |
1366 | ret = stream_fd; | |
1367 | goto fd_error; | |
1368 | } | |
63629d86 | 1369 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1370 | if (IS_ERR(stream_file)) { |
1371 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1372 | goto file_error; |
1373 | } | |
409453cb MD |
1374 | /* |
1375 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1376 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1377 | * file descriptor, so we set FMODE_PREAD here. | |
1378 | */ | |
d7b6f197 | 1379 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1380 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1381 | /* |
1382 | * The stream holds a reference to the channel within the generic ring | |
1383 | * buffer library, so no need to hold a refcount on the channel and | |
1384 | * session files here. | |
1385 | */ | |
ad1c05e1 MD |
1386 | return stream_fd; |
1387 | ||
1388 | file_error: | |
1389 | put_unused_fd(stream_fd); | |
d83004aa JD |
1390 | fd_error: |
1391 | return ret; | |
1392 | } | |
1393 | ||
1394 | static | |
1395 | int lttng_abi_open_stream(struct file *channel_file) | |
1396 | { | |
1397 | struct lttng_channel *channel = channel_file->private_data; | |
1398 | struct lib_ring_buffer *buf; | |
1399 | int ret; | |
1400 | void *stream_priv; | |
1401 | ||
1402 | buf = channel->ops->buffer_read_open(channel->chan); | |
1403 | if (!buf) | |
1404 | return -ENOENT; | |
1405 | ||
1406 | stream_priv = buf; | |
1407 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
63629d86 FD |
1408 | <tng_stream_ring_buffer_file_operations, |
1409 | "[lttng_stream]"); | |
d83004aa JD |
1410 | if (ret < 0) |
1411 | goto fd_error; | |
1412 | ||
1413 | return ret; | |
1414 | ||
1415 | fd_error: | |
1416 | channel->ops->buffer_read_close(buf); | |
1417 | return ret; | |
1418 | } | |
1419 | ||
1420 | static | |
1421 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1422 | { | |
1423 | struct lttng_channel *channel = channel_file->private_data; | |
1424 | struct lttng_session *session = channel->session; | |
1425 | struct lib_ring_buffer *buf; | |
1426 | int ret; | |
1427 | struct lttng_metadata_stream *metadata_stream; | |
1428 | void *stream_priv; | |
1429 | ||
1430 | buf = channel->ops->buffer_read_open(channel->chan); | |
1431 | if (!buf) | |
1432 | return -ENOENT; | |
1433 | ||
1434 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1435 | GFP_KERNEL); | |
b3b8072b MD |
1436 | if (!metadata_stream) { |
1437 | ret = -ENOMEM; | |
1438 | goto nomem; | |
1439 | } | |
d83004aa JD |
1440 | metadata_stream->metadata_cache = session->metadata_cache; |
1441 | init_waitqueue_head(&metadata_stream->read_wait); | |
1442 | metadata_stream->priv = buf; | |
1443 | stream_priv = metadata_stream; | |
b3b8072b MD |
1444 | metadata_stream->transport = channel->transport; |
1445 | ||
1446 | /* | |
1447 | * Since life-time of metadata cache differs from that of | |
1448 | * session, we need to keep our own reference on the transport. | |
1449 | */ | |
1450 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1451 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1452 | ret = -EINVAL; | |
1453 | goto notransport; | |
1454 | } | |
1455 | ||
901aaa5f FD |
1456 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1457 | ret = -EOVERFLOW; | |
9c1f4643 | 1458 | goto kref_error; |
901aaa5f FD |
1459 | } |
1460 | ||
d83004aa | 1461 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
63629d86 FD |
1462 | <tng_metadata_ring_buffer_file_operations, |
1463 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1464 | if (ret < 0) |
1465 | goto fd_error; | |
1466 | ||
d83004aa JD |
1467 | list_add(&metadata_stream->list, |
1468 | &session->metadata_cache->metadata_stream); | |
1469 | return ret; | |
1470 | ||
ad1c05e1 | 1471 | fd_error: |
9c1f4643 MD |
1472 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1473 | kref_error: | |
b3b8072b MD |
1474 | module_put(metadata_stream->transport->owner); |
1475 | notransport: | |
1476 | kfree(metadata_stream); | |
1477 | nomem: | |
11b5a3c2 | 1478 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1479 | return ret; |
1480 | } | |
1481 | ||
63629d86 FD |
1482 | static |
1483 | int lttng_abi_open_trigger_group_stream(struct file *notif_file) | |
1484 | { | |
1485 | struct lttng_trigger_group *trigger_group = notif_file->private_data; | |
1486 | struct channel *chan = trigger_group->chan; | |
1487 | struct lib_ring_buffer *buf; | |
1488 | int ret; | |
1489 | void *stream_priv; | |
1490 | ||
1491 | buf = trigger_group->ops->buffer_read_open(chan); | |
1492 | if (!buf) | |
1493 | return -ENOENT; | |
1494 | ||
1495 | /* The trigger notification fd holds a reference on the trigger group */ | |
1496 | if (!atomic_long_add_unless(¬if_file->f_count, 1, LONG_MAX)) { | |
1497 | ret = -EOVERFLOW; | |
1498 | goto refcount_error; | |
1499 | } | |
1500 | trigger_group->buf = buf; | |
1501 | stream_priv = trigger_group; | |
1502 | ret = lttng_abi_create_stream_fd(notif_file, stream_priv, | |
1503 | <tng_trigger_group_notif_fops, | |
1504 | "[lttng_trigger_stream]"); | |
1505 | if (ret < 0) | |
1506 | goto fd_error; | |
1507 | ||
1508 | return ret; | |
1509 | ||
1510 | fd_error: | |
1511 | atomic_long_dec(¬if_file->f_count); | |
1512 | refcount_error: | |
1513 | trigger_group->ops->buffer_read_close(buf); | |
1514 | return ret; | |
1515 | } | |
1516 | ||
653fe716 | 1517 | static |
c0e31d2e | 1518 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1519 | struct lttng_kernel_event *event_param) |
653fe716 | 1520 | { |
a90917c3 | 1521 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1522 | int event_fd, ret; |
11b5a3c2 | 1523 | struct file *event_file; |
3c997079 | 1524 | void *priv; |
653fe716 | 1525 | |
6dccd6c1 JD |
1526 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1527 | switch (event_param->instrumentation) { | |
7371f44c | 1528 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1529 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1530 | break; |
ab2277d6 | 1531 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1532 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1533 | break; |
ab2277d6 | 1534 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 1535 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
1536 | break; |
1537 | default: | |
1538 | break; | |
1539 | } | |
33a39a3c MD |
1540 | event_fd = lttng_get_unused_fd(); |
1541 | if (event_fd < 0) { | |
1542 | ret = event_fd; | |
1543 | goto fd_error; | |
1544 | } | |
1545 | event_file = anon_inode_getfile("[lttng_event]", | |
1546 | <tng_event_fops, | |
1547 | NULL, O_RDWR); | |
1548 | if (IS_ERR(event_file)) { | |
1549 | ret = PTR_ERR(event_file); | |
1550 | goto file_error; | |
1551 | } | |
9c1f4643 | 1552 | /* The event holds a reference on the channel */ |
98d7281c | 1553 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1554 | ret = -EOVERFLOW; |
9c1f4643 MD |
1555 | goto refcount_error; |
1556 | } | |
33a39a3c MD |
1557 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1558 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
63629d86 | 1559 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1560 | |
4993071a PP |
1561 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1562 | /* | |
1563 | * If the event name is a star globbing pattern, | |
1564 | * we create the special star globbing enabler. | |
1565 | */ | |
63629d86 | 1566 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1567 | event_param, channel); |
3c997079 | 1568 | } else { |
63629d86 | 1569 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1570 | event_param, channel); |
1ec65de1 | 1571 | } |
63629d86 | 1572 | priv = event_enabler; |
33a39a3c MD |
1573 | } else { |
1574 | struct lttng_event *event; | |
4ee2453d | 1575 | |
33a39a3c MD |
1576 | /* |
1577 | * We tolerate no failure path after event creation. It | |
1578 | * will stay invariant for the rest of the session. | |
1579 | */ | |
1580 | event = lttng_event_create(channel, event_param, | |
1581 | NULL, NULL, | |
1582 | event_param->instrumentation); | |
1583 | WARN_ON_ONCE(!event); | |
1584 | if (IS_ERR(event)) { | |
1585 | ret = PTR_ERR(event); | |
1586 | goto event_error; | |
80f87dd2 | 1587 | } |
33a39a3c | 1588 | priv = event; |
03037b98 | 1589 | } |
33a39a3c MD |
1590 | event_file->private_data = priv; |
1591 | fd_install(event_fd, event_file); | |
653fe716 MD |
1592 | return event_fd; |
1593 | ||
03037b98 | 1594 | event_error: |
9c1f4643 MD |
1595 | atomic_long_dec(&channel_file->f_count); |
1596 | refcount_error: | |
c0e31d2e | 1597 | fput(event_file); |
653fe716 MD |
1598 | file_error: |
1599 | put_unused_fd(event_fd); | |
1600 | fd_error: | |
653fe716 MD |
1601 | return ret; |
1602 | } | |
ad1c05e1 | 1603 | |
63629d86 FD |
1604 | static |
1605 | long lttng_trigger_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1606 | { | |
1607 | struct lttng_trigger *trigger; | |
1608 | struct lttng_trigger_enabler *trigger_enabler; | |
1609 | enum lttng_event_type *evtype = file->private_data; | |
1610 | ||
1611 | switch (cmd) { | |
1612 | case LTTNG_KERNEL_ENABLE: | |
1613 | switch (*evtype) { | |
1614 | case LTTNG_TYPE_EVENT: | |
1615 | trigger = file->private_data; | |
1616 | return lttng_trigger_enable(trigger); | |
1617 | case LTTNG_TYPE_ENABLER: | |
1618 | trigger_enabler = file->private_data; | |
1619 | return lttng_trigger_enabler_enable(trigger_enabler); | |
1620 | default: | |
1621 | WARN_ON_ONCE(1); | |
1622 | return -ENOSYS; | |
1623 | } | |
1624 | case LTTNG_KERNEL_DISABLE: | |
1625 | switch (*evtype) { | |
1626 | case LTTNG_TYPE_EVENT: | |
1627 | trigger = file->private_data; | |
1628 | return lttng_trigger_disable(trigger); | |
1629 | case LTTNG_TYPE_ENABLER: | |
1630 | trigger_enabler = file->private_data; | |
1631 | return lttng_trigger_enabler_disable(trigger_enabler); | |
1632 | default: | |
1633 | WARN_ON_ONCE(1); | |
1634 | return -ENOSYS; | |
1635 | } | |
1636 | case LTTNG_KERNEL_FILTER: | |
1637 | switch (*evtype) { | |
1638 | case LTTNG_TYPE_EVENT: | |
1639 | return -EINVAL; | |
1640 | case LTTNG_TYPE_ENABLER: | |
1641 | trigger_enabler = file->private_data; | |
1642 | return lttng_trigger_enabler_attach_bytecode(trigger_enabler, | |
1643 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1644 | default: | |
1645 | WARN_ON_ONCE(1); | |
1646 | return -ENOSYS; | |
1647 | } | |
1648 | case LTTNG_KERNEL_ADD_CALLSITE: | |
1649 | switch (*evtype) { | |
1650 | case LTTNG_TYPE_EVENT: | |
1651 | trigger = file->private_data; | |
1652 | return lttng_trigger_add_callsite(trigger, | |
1653 | (struct lttng_kernel_event_callsite __user *) arg); | |
1654 | case LTTNG_TYPE_ENABLER: | |
1655 | return -EINVAL; | |
1656 | default: | |
1657 | WARN_ON_ONCE(1); | |
1658 | return -ENOSYS; | |
1659 | } | |
1660 | default: | |
1661 | return -ENOIOCTLCMD; | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | static | |
1666 | int lttng_trigger_release(struct inode *inode, struct file *file) | |
1667 | { | |
1668 | struct lttng_trigger *trigger; | |
1669 | struct lttng_trigger_enabler *trigger_enabler; | |
1670 | enum lttng_event_type *evtype = file->private_data; | |
1671 | ||
1672 | if (!evtype) | |
1673 | return 0; | |
1674 | ||
1675 | switch (*evtype) { | |
1676 | case LTTNG_TYPE_EVENT: | |
1677 | trigger = file->private_data; | |
1678 | if (trigger) | |
1679 | fput(trigger->group->file); | |
1680 | break; | |
1681 | case LTTNG_TYPE_ENABLER: | |
1682 | trigger_enabler = file->private_data; | |
1683 | if (trigger_enabler) | |
1684 | fput(trigger_enabler->group->file); | |
1685 | break; | |
1686 | default: | |
1687 | WARN_ON_ONCE(1); | |
1688 | break; | |
1689 | } | |
1690 | ||
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | static const struct file_operations lttng_trigger_fops = { | |
1695 | .owner = THIS_MODULE, | |
1696 | .release = lttng_trigger_release, | |
1697 | .unlocked_ioctl = lttng_trigger_ioctl, | |
1698 | #ifdef CONFIG_COMPAT | |
1699 | .compat_ioctl = lttng_trigger_ioctl, | |
1700 | #endif | |
1701 | }; | |
1702 | ||
1703 | static | |
1704 | int lttng_abi_create_trigger(struct file *trigger_group_file, | |
1705 | struct lttng_kernel_trigger *trigger_param) | |
1706 | { | |
1707 | struct lttng_trigger_group *trigger_group = trigger_group_file->private_data; | |
1708 | int trigger_fd, ret; | |
1709 | struct file *trigger_file; | |
1710 | void *priv; | |
1711 | ||
1712 | switch (trigger_param->instrumentation) { | |
1713 | case LTTNG_KERNEL_TRACEPOINT: | |
1714 | case LTTNG_KERNEL_UPROBE: | |
1715 | break; | |
1716 | case LTTNG_KERNEL_KPROBE: | |
1717 | trigger_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1718 | break; | |
1719 | case LTTNG_KERNEL_SYSCALL: | |
1720 | break; | |
1721 | case LTTNG_KERNEL_KRETPROBE: | |
1722 | /* Placing a trigger on kretprobe is not supported. */ | |
1723 | case LTTNG_KERNEL_FUNCTION: | |
1724 | case LTTNG_KERNEL_NOOP: | |
1725 | default: | |
1726 | ret = -EINVAL; | |
1727 | goto inval_instr; | |
1728 | } | |
1729 | ||
1730 | trigger_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1731 | ||
1732 | trigger_fd = lttng_get_unused_fd(); | |
1733 | if (trigger_fd < 0) { | |
1734 | ret = trigger_fd; | |
1735 | goto fd_error; | |
1736 | } | |
1737 | ||
1738 | trigger_file = anon_inode_getfile("[lttng_trigger]", | |
1739 | <tng_trigger_fops, | |
1740 | NULL, O_RDWR); | |
1741 | if (IS_ERR(trigger_file)) { | |
1742 | ret = PTR_ERR(trigger_file); | |
1743 | goto file_error; | |
1744 | } | |
1745 | ||
1746 | /* The trigger holds a reference on the trigger group. */ | |
1747 | if (!atomic_long_add_unless(&trigger_group_file->f_count, 1, LONG_MAX)) { | |
1748 | ret = -EOVERFLOW; | |
1749 | goto refcount_error; | |
1750 | } | |
1751 | ||
1752 | if (trigger_param->instrumentation == LTTNG_KERNEL_TRACEPOINT | |
1753 | || trigger_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1754 | struct lttng_trigger_enabler *enabler; | |
1755 | ||
1756 | if (strutils_is_star_glob_pattern(trigger_param->name)) { | |
1757 | /* | |
1758 | * If the event name is a star globbing pattern, | |
1759 | * we create the special star globbing enabler. | |
1760 | */ | |
1761 | enabler = lttng_trigger_enabler_create(trigger_group, | |
1762 | LTTNG_ENABLER_FORMAT_STAR_GLOB, trigger_param); | |
1763 | } else { | |
1764 | enabler = lttng_trigger_enabler_create(trigger_group, | |
1765 | LTTNG_ENABLER_FORMAT_NAME, trigger_param); | |
1766 | } | |
1767 | priv = enabler; | |
1768 | } else { | |
1769 | struct lttng_trigger *trigger; | |
1770 | ||
1771 | /* | |
1772 | * We tolerate no failure path after trigger creation. It | |
1773 | * will stay invariant for the rest of the session. | |
1774 | */ | |
1775 | trigger = lttng_trigger_create(NULL, trigger_param->id, | |
1776 | trigger_group, trigger_param, NULL, | |
1777 | trigger_param->instrumentation); | |
1778 | WARN_ON_ONCE(!trigger); | |
1779 | if (IS_ERR(trigger)) { | |
1780 | ret = PTR_ERR(trigger); | |
1781 | goto trigger_error; | |
1782 | } | |
1783 | priv = trigger; | |
1784 | } | |
1785 | trigger_file->private_data = priv; | |
1786 | fd_install(trigger_fd, trigger_file); | |
1787 | return trigger_fd; | |
1788 | ||
1789 | trigger_error: | |
1790 | atomic_long_dec(&trigger_group_file->f_count); | |
1791 | refcount_error: | |
1792 | fput(trigger_file); | |
1793 | file_error: | |
1794 | put_unused_fd(trigger_fd); | |
1795 | fd_error: | |
1796 | inval_instr: | |
1797 | return ret; | |
1798 | } | |
1799 | ||
1800 | static | |
1801 | long lttng_trigger_group_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1802 | { | |
1803 | switch (cmd) { | |
1804 | case LTTNG_KERNEL_TRIGGER_GROUP_NOTIFICATION_FD: | |
1805 | { | |
1806 | return lttng_abi_open_trigger_group_stream(file); | |
1807 | } | |
1808 | case LTTNG_KERNEL_TRIGGER_CREATE: | |
1809 | { | |
1810 | struct lttng_kernel_trigger utrigger_param; | |
1811 | ||
1812 | if (copy_from_user(&utrigger_param, | |
1813 | (struct lttng_kernel_trigger __user *) arg, | |
1814 | sizeof(utrigger_param))) | |
1815 | return -EFAULT; | |
1816 | return lttng_abi_create_trigger(file, &utrigger_param); | |
1817 | } | |
1818 | default: | |
1819 | return -ENOIOCTLCMD; | |
1820 | } | |
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | static | |
1825 | int lttng_trigger_group_release(struct inode *inode, struct file *file) | |
1826 | { | |
1827 | struct lttng_trigger_group *trigger_group = file->private_data; | |
1828 | ||
1829 | if (trigger_group) | |
1830 | lttng_trigger_group_destroy(trigger_group); | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | static const struct file_operations lttng_trigger_group_fops = { | |
1835 | .owner = THIS_MODULE, | |
1836 | .release = lttng_trigger_group_release, | |
1837 | .unlocked_ioctl = lttng_trigger_group_ioctl, | |
1838 | #ifdef CONFIG_COMPAT | |
1839 | .compat_ioctl = lttng_trigger_group_ioctl, | |
1840 | #endif | |
1841 | }; | |
1842 | ||
ad1c05e1 MD |
1843 | /** |
1844 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1845 | * | |
c0e31d2e | 1846 | * @file: the file |
ad1c05e1 MD |
1847 | * @cmd: the command |
1848 | * @arg: command arg | |
1849 | * | |
1850 | * This ioctl implements lttng commands: | |
38d024ae | 1851 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1852 | * Returns an event stream file descriptor or failure. |
1853 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1854 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1855 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1856 | * LTTNG_KERNEL_CONTEXT |
1857 | * Prepend a context field to each event in the channel | |
e64957da MD |
1858 | * LTTNG_KERNEL_ENABLE |
1859 | * Enable recording for events in this channel (weak enable) | |
1860 | * LTTNG_KERNEL_DISABLE | |
1861 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1862 | * |
baf20995 MD |
1863 | * Channel and event file descriptors also hold a reference on the session. |
1864 | */ | |
ad1c05e1 | 1865 | static |
c0e31d2e | 1866 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1867 | { |
a90917c3 | 1868 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1869 | |
baf20995 | 1870 | switch (cmd) { |
6dccd6c1 | 1871 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1872 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1873 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1874 | case LTTNG_KERNEL_OLD_EVENT: |
1875 | { | |
1876 | struct lttng_kernel_event *uevent_param; | |
1877 | struct lttng_kernel_old_event *old_uevent_param; | |
1878 | int ret; | |
1879 | ||
1880 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1881 | GFP_KERNEL); | |
1882 | if (!uevent_param) { | |
1883 | ret = -ENOMEM; | |
1884 | goto old_event_end; | |
1885 | } | |
1886 | old_uevent_param = kmalloc( | |
1887 | sizeof(struct lttng_kernel_old_event), | |
1888 | GFP_KERNEL); | |
1889 | if (!old_uevent_param) { | |
1890 | ret = -ENOMEM; | |
1891 | goto old_event_error_free_param; | |
1892 | } | |
1893 | if (copy_from_user(old_uevent_param, | |
1894 | (struct lttng_kernel_old_event __user *) arg, | |
1895 | sizeof(struct lttng_kernel_old_event))) { | |
1896 | ret = -EFAULT; | |
1897 | goto old_event_error_free_old_param; | |
1898 | } | |
1899 | ||
1900 | memcpy(uevent_param->name, old_uevent_param->name, | |
1901 | sizeof(uevent_param->name)); | |
1902 | uevent_param->instrumentation = | |
1903 | old_uevent_param->instrumentation; | |
1904 | ||
1905 | switch (old_uevent_param->instrumentation) { | |
1906 | case LTTNG_KERNEL_KPROBE: | |
1907 | uevent_param->u.kprobe.addr = | |
1908 | old_uevent_param->u.kprobe.addr; | |
1909 | uevent_param->u.kprobe.offset = | |
1910 | old_uevent_param->u.kprobe.offset; | |
1911 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1912 | old_uevent_param->u.kprobe.symbol_name, | |
1913 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1914 | break; | |
1915 | case LTTNG_KERNEL_KRETPROBE: | |
1916 | uevent_param->u.kretprobe.addr = | |
1917 | old_uevent_param->u.kretprobe.addr; | |
1918 | uevent_param->u.kretprobe.offset = | |
1919 | old_uevent_param->u.kretprobe.offset; | |
1920 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1921 | old_uevent_param->u.kretprobe.symbol_name, | |
1922 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1923 | break; | |
1924 | case LTTNG_KERNEL_FUNCTION: | |
1925 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1926 | old_uevent_param->u.ftrace.symbol_name, | |
1927 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1928 | break; | |
1929 | default: | |
1930 | break; | |
1931 | } | |
1932 | ret = lttng_abi_create_event(file, uevent_param); | |
1933 | ||
1934 | old_event_error_free_old_param: | |
1935 | kfree(old_uevent_param); | |
1936 | old_event_error_free_param: | |
1937 | kfree(uevent_param); | |
1938 | old_event_end: | |
1939 | return ret; | |
1940 | } | |
38d024ae | 1941 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1942 | { |
1943 | struct lttng_kernel_event uevent_param; | |
1944 | ||
1945 | if (copy_from_user(&uevent_param, | |
1946 | (struct lttng_kernel_event __user *) arg, | |
1947 | sizeof(uevent_param))) | |
1948 | return -EFAULT; | |
1949 | return lttng_abi_create_event(file, &uevent_param); | |
1950 | } | |
1951 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1952 | { | |
1953 | struct lttng_kernel_context *ucontext_param; | |
1954 | struct lttng_kernel_old_context *old_ucontext_param; | |
1955 | int ret; | |
1956 | ||
1957 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1958 | GFP_KERNEL); | |
1959 | if (!ucontext_param) { | |
1960 | ret = -ENOMEM; | |
1961 | goto old_ctx_end; | |
1962 | } | |
1963 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1964 | GFP_KERNEL); | |
1965 | if (!old_ucontext_param) { | |
1966 | ret = -ENOMEM; | |
1967 | goto old_ctx_error_free_param; | |
1968 | } | |
1969 | ||
1970 | if (copy_from_user(old_ucontext_param, | |
1971 | (struct lttng_kernel_old_context __user *) arg, | |
1972 | sizeof(struct lttng_kernel_old_context))) { | |
1973 | ret = -EFAULT; | |
1974 | goto old_ctx_error_free_old_param; | |
1975 | } | |
1976 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1977 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1978 | sizeof(ucontext_param->padding)); | |
1979 | /* only type that uses the union */ | |
1980 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1981 | ucontext_param->u.perf_counter.type = | |
1982 | old_ucontext_param->u.perf_counter.type; | |
1983 | ucontext_param->u.perf_counter.config = | |
1984 | old_ucontext_param->u.perf_counter.config; | |
1985 | memcpy(ucontext_param->u.perf_counter.name, | |
1986 | old_ucontext_param->u.perf_counter.name, | |
1987 | sizeof(ucontext_param->u.perf_counter.name)); | |
1988 | } | |
1989 | ||
1990 | ret = lttng_abi_add_context(file, | |
1991 | ucontext_param, | |
1992 | &channel->ctx, channel->session); | |
1993 | ||
1994 | old_ctx_error_free_old_param: | |
1995 | kfree(old_ucontext_param); | |
1996 | old_ctx_error_free_param: | |
1997 | kfree(ucontext_param); | |
1998 | old_ctx_end: | |
1999 | return ret; | |
2000 | } | |
8070f5c0 | 2001 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
2002 | { |
2003 | struct lttng_kernel_context ucontext_param; | |
2004 | ||
2005 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 2006 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
2007 | sizeof(ucontext_param))) |
2008 | return -EFAULT; | |
2009 | return lttng_abi_add_context(file, | |
2010 | &ucontext_param, | |
8070f5c0 | 2011 | &channel->ctx, channel->session); |
6dccd6c1 JD |
2012 | } |
2013 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2014 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 2015 | return lttng_channel_enable(channel); |
6dccd6c1 | 2016 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2017 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 2018 | return lttng_channel_disable(channel); |
12e579db MD |
2019 | case LTTNG_KERNEL_SYSCALL_MASK: |
2020 | return lttng_channel_syscall_mask(channel, | |
2021 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
2022 | default: |
2023 | return -ENOIOCTLCMD; | |
2024 | } | |
2025 | } | |
2026 | ||
5dbbdb43 MD |
2027 | /** |
2028 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
2029 | * | |
2030 | * @file: the file | |
2031 | * @cmd: the command | |
2032 | * @arg: command arg | |
2033 | * | |
2034 | * This ioctl implements lttng commands: | |
38d024ae | 2035 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
2036 | * Returns an event stream file descriptor or failure. |
2037 | * | |
2038 | * Channel and event file descriptors also hold a reference on the session. | |
2039 | */ | |
2040 | static | |
2041 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2042 | { | |
2043 | switch (cmd) { | |
6dccd6c1 | 2044 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 2045 | case LTTNG_KERNEL_STREAM: |
d83004aa | 2046 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
2047 | default: |
2048 | return -ENOIOCTLCMD; | |
2049 | } | |
2050 | } | |
2051 | ||
653fe716 MD |
2052 | /** |
2053 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
2054 | * | |
c0e31d2e | 2055 | * @file: the file |
653fe716 MD |
2056 | * @wait: poll table |
2057 | */ | |
c0e31d2e | 2058 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 2059 | { |
a90917c3 | 2060 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
2061 | unsigned int mask = 0; |
2062 | ||
c0e31d2e | 2063 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 2064 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
2065 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
2066 | wait); | |
653fe716 | 2067 | |
254ec7bc MD |
2068 | if (channel->ops->is_disabled(channel->chan)) |
2069 | return POLLERR; | |
24cedcfe | 2070 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 2071 | return POLLHUP; |
f71ecafa | 2072 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 2073 | return POLLIN | POLLRDNORM; |
f71ecafa | 2074 | return 0; |
653fe716 MD |
2075 | } |
2076 | return mask; | |
2077 | ||
2078 | } | |
2079 | ||
0a84a57f MD |
2080 | static |
2081 | int lttng_channel_release(struct inode *inode, struct file *file) | |
2082 | { | |
a90917c3 | 2083 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
2084 | |
2085 | if (channel) | |
2086 | fput(channel->session->file); | |
0a84a57f MD |
2087 | return 0; |
2088 | } | |
2089 | ||
d83004aa JD |
2090 | static |
2091 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
2092 | { | |
2093 | struct lttng_channel *channel = file->private_data; | |
2094 | ||
2095 | if (channel) { | |
d83004aa | 2096 | fput(channel->session->file); |
a3381417 | 2097 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
2098 | } |
2099 | ||
2100 | return 0; | |
2101 | } | |
2102 | ||
ad1c05e1 | 2103 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 2104 | .owner = THIS_MODULE, |
03037b98 | 2105 | .release = lttng_channel_release, |
653fe716 | 2106 | .poll = lttng_channel_poll, |
ad1c05e1 | 2107 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 2108 | #ifdef CONFIG_COMPAT |
03037b98 | 2109 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 2110 | #endif |
11b5a3c2 | 2111 | }; |
baf20995 | 2112 | |
5dbbdb43 | 2113 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 2114 | .owner = THIS_MODULE, |
d83004aa | 2115 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
2116 | .unlocked_ioctl = lttng_metadata_ioctl, |
2117 | #ifdef CONFIG_COMPAT | |
2118 | .compat_ioctl = lttng_metadata_ioctl, | |
2119 | #endif | |
2120 | }; | |
2121 | ||
8070f5c0 MD |
2122 | /** |
2123 | * lttng_event_ioctl - lttng syscall through ioctl | |
2124 | * | |
2125 | * @file: the file | |
2126 | * @cmd: the command | |
2127 | * @arg: command arg | |
2128 | * | |
2129 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
2130 | * LTTNG_KERNEL_CONTEXT |
2131 | * Prepend a context field to each record of this event | |
e64957da MD |
2132 | * LTTNG_KERNEL_ENABLE |
2133 | * Enable recording for this event (weak enable) | |
2134 | * LTTNG_KERNEL_DISABLE | |
2135 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
2136 | */ |
2137 | static | |
2138 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2139 | { | |
3c997079 | 2140 | struct lttng_event *event; |
63629d86 | 2141 | struct lttng_event_enabler *event_enabler; |
3c997079 | 2142 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
2143 | |
2144 | switch (cmd) { | |
6dccd6c1 JD |
2145 | case LTTNG_KERNEL_OLD_CONTEXT: |
2146 | { | |
3c997079 MD |
2147 | /* Not implemented */ |
2148 | return -ENOSYS; | |
6dccd6c1 | 2149 | } |
8070f5c0 | 2150 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 2151 | { |
3c997079 MD |
2152 | /* Not implemented */ |
2153 | return -ENOSYS; | |
6dccd6c1 JD |
2154 | } |
2155 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 2156 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
2157 | switch (*evtype) { |
2158 | case LTTNG_TYPE_EVENT: | |
2159 | event = file->private_data; | |
2160 | return lttng_event_enable(event); | |
2161 | case LTTNG_TYPE_ENABLER: | |
63629d86 FD |
2162 | event_enabler = file->private_data; |
2163 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
2164 | default: |
2165 | WARN_ON_ONCE(1); | |
2166 | return -ENOSYS; | |
2167 | } | |
6dccd6c1 | 2168 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 2169 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
2170 | switch (*evtype) { |
2171 | case LTTNG_TYPE_EVENT: | |
2172 | event = file->private_data; | |
2173 | return lttng_event_disable(event); | |
2174 | case LTTNG_TYPE_ENABLER: | |
63629d86 FD |
2175 | event_enabler = file->private_data; |
2176 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
2177 | default: |
2178 | WARN_ON_ONCE(1); | |
2179 | return -ENOSYS; | |
2180 | } | |
07dfc1d0 MD |
2181 | case LTTNG_KERNEL_FILTER: |
2182 | switch (*evtype) { | |
2183 | case LTTNG_TYPE_EVENT: | |
2184 | return -EINVAL; | |
2185 | case LTTNG_TYPE_ENABLER: | |
2186 | { | |
63629d86 FD |
2187 | event_enabler = file->private_data; |
2188 | return lttng_event_enabler_attach_bytecode(event_enabler, | |
07dfc1d0 MD |
2189 | (struct lttng_kernel_filter_bytecode __user *) arg); |
2190 | } | |
0586316f MD |
2191 | default: |
2192 | WARN_ON_ONCE(1); | |
2193 | return -ENOSYS; | |
07dfc1d0 | 2194 | } |
3aed4dca FD |
2195 | case LTTNG_KERNEL_ADD_CALLSITE: |
2196 | switch (*evtype) { | |
2197 | case LTTNG_TYPE_EVENT: | |
2198 | event = file->private_data; | |
2199 | return lttng_event_add_callsite(event, | |
2200 | (struct lttng_kernel_event_callsite __user *) arg); | |
2201 | case LTTNG_TYPE_ENABLER: | |
2202 | return -EINVAL; | |
64c147c0 MD |
2203 | default: |
2204 | WARN_ON_ONCE(1); | |
2205 | return -ENOSYS; | |
3aed4dca | 2206 | } |
8070f5c0 MD |
2207 | default: |
2208 | return -ENOIOCTLCMD; | |
2209 | } | |
2210 | } | |
2211 | ||
0a84a57f MD |
2212 | static |
2213 | int lttng_event_release(struct inode *inode, struct file *file) | |
2214 | { | |
3c997079 | 2215 | struct lttng_event *event; |
63629d86 | 2216 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
2217 | enum lttng_event_type *evtype = file->private_data; |
2218 | ||
2219 | if (!evtype) | |
2220 | return 0; | |
2221 | ||
2222 | switch (*evtype) { | |
2223 | case LTTNG_TYPE_EVENT: | |
2224 | event = file->private_data; | |
2225 | if (event) | |
2226 | fput(event->chan->file); | |
2227 | break; | |
2228 | case LTTNG_TYPE_ENABLER: | |
63629d86 FD |
2229 | event_enabler = file->private_data; |
2230 | if (event_enabler) | |
2231 | fput(event_enabler->chan->file); | |
3c997079 MD |
2232 | break; |
2233 | default: | |
2234 | WARN_ON_ONCE(1); | |
2235 | break; | |
2236 | } | |
c269fff4 | 2237 | |
0a84a57f MD |
2238 | return 0; |
2239 | } | |
2240 | ||
3b923e5b | 2241 | /* TODO: filter control ioctl */ |
0a84a57f | 2242 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 2243 | .owner = THIS_MODULE, |
0a84a57f | 2244 | .release = lttng_event_release, |
8070f5c0 MD |
2245 | .unlocked_ioctl = lttng_event_ioctl, |
2246 | #ifdef CONFIG_COMPAT | |
2247 | .compat_ioctl = lttng_event_ioctl, | |
2248 | #endif | |
11b5a3c2 | 2249 | }; |
0a84a57f | 2250 | |
3b731ab1 JD |
2251 | static int put_u64(uint64_t val, unsigned long arg) |
2252 | { | |
2253 | return put_user(val, (uint64_t __user *) arg); | |
2254 | } | |
2255 | ||
ed8d02d6 JD |
2256 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
2257 | unsigned int cmd, unsigned long arg) | |
2258 | { | |
3b731ab1 JD |
2259 | struct lib_ring_buffer *buf = filp->private_data; |
2260 | struct channel *chan = buf->backend.chan; | |
2261 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2262 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2263 | int ret; |
2264 | ||
2265 | if (atomic_read(&chan->record_disabled)) | |
2266 | return -EIO; | |
2267 | ||
ed8d02d6 | 2268 | switch (cmd) { |
3b731ab1 JD |
2269 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
2270 | { | |
2271 | uint64_t ts; | |
2272 | ||
dd5a0db3 | 2273 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2274 | if (ret < 0) |
2275 | goto error; | |
2276 | return put_u64(ts, arg); | |
2277 | } | |
2278 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
2279 | { | |
2280 | uint64_t ts; | |
2281 | ||
dd5a0db3 | 2282 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2283 | if (ret < 0) |
2284 | goto error; | |
2285 | return put_u64(ts, arg); | |
2286 | } | |
2287 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
2288 | { | |
2289 | uint64_t ed; | |
2290 | ||
dd5a0db3 | 2291 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2292 | if (ret < 0) |
2293 | goto error; | |
2294 | return put_u64(ed, arg); | |
2295 | } | |
2296 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
2297 | { | |
2298 | uint64_t cs; | |
2299 | ||
dd5a0db3 | 2300 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2301 | if (ret < 0) |
2302 | goto error; | |
2303 | return put_u64(cs, arg); | |
2304 | } | |
2305 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
2306 | { | |
2307 | uint64_t ps; | |
2308 | ||
dd5a0db3 | 2309 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2310 | if (ret < 0) |
2311 | goto error; | |
2312 | return put_u64(ps, arg); | |
2313 | } | |
2314 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
2315 | { | |
2316 | uint64_t si; | |
2317 | ||
dd5a0db3 | 2318 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2319 | if (ret < 0) |
2320 | goto error; | |
2321 | return put_u64(si, arg); | |
2322 | } | |
2348ca17 JD |
2323 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2324 | { | |
2325 | uint64_t ts; | |
2326 | ||
dd5a0db3 | 2327 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2328 | if (ret < 0) |
2329 | goto error; | |
2330 | return put_u64(ts, arg); | |
2331 | } | |
5b3cf4f9 JD |
2332 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
2333 | { | |
2334 | uint64_t seq; | |
2335 | ||
2336 | ret = ops->sequence_number(config, buf, &seq); | |
2337 | if (ret < 0) | |
2338 | goto error; | |
2339 | return put_u64(seq, arg); | |
2340 | } | |
5594698f JD |
2341 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
2342 | { | |
2343 | uint64_t id; | |
2344 | ||
2345 | ret = ops->instance_id(config, buf, &id); | |
2346 | if (ret < 0) | |
2347 | goto error; | |
2348 | return put_u64(id, arg); | |
2349 | } | |
3b731ab1 JD |
2350 | default: |
2351 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
2352 | cmd, arg); | |
ed8d02d6 | 2353 | } |
3b731ab1 JD |
2354 | |
2355 | error: | |
2356 | return -ENOSYS; | |
ed8d02d6 JD |
2357 | } |
2358 | ||
2359 | #ifdef CONFIG_COMPAT | |
2360 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
2361 | unsigned int cmd, unsigned long arg) | |
2362 | { | |
3b731ab1 JD |
2363 | struct lib_ring_buffer *buf = filp->private_data; |
2364 | struct channel *chan = buf->backend.chan; | |
2365 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 2366 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2367 | int ret; |
2368 | ||
2369 | if (atomic_read(&chan->record_disabled)) | |
2370 | return -EIO; | |
2371 | ||
ed8d02d6 | 2372 | switch (cmd) { |
3b731ab1 JD |
2373 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2374 | { | |
2375 | uint64_t ts; | |
2376 | ||
dd5a0db3 | 2377 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2378 | if (ret < 0) |
2379 | goto error; | |
2380 | return put_u64(ts, arg); | |
2381 | } | |
2382 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2383 | { | |
2384 | uint64_t ts; | |
2385 | ||
dd5a0db3 | 2386 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2387 | if (ret < 0) |
2388 | goto error; | |
2389 | return put_u64(ts, arg); | |
2390 | } | |
2391 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2392 | { | |
2393 | uint64_t ed; | |
2394 | ||
dd5a0db3 | 2395 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2396 | if (ret < 0) |
2397 | goto error; | |
2398 | return put_u64(ed, arg); | |
ed8d02d6 | 2399 | } |
3b731ab1 JD |
2400 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2401 | { | |
2402 | uint64_t cs; | |
2403 | ||
dd5a0db3 | 2404 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2405 | if (ret < 0) |
2406 | goto error; | |
2407 | return put_u64(cs, arg); | |
2408 | } | |
2409 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2410 | { | |
2411 | uint64_t ps; | |
2412 | ||
dd5a0db3 | 2413 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2414 | if (ret < 0) |
2415 | goto error; | |
2416 | return put_u64(ps, arg); | |
2417 | } | |
2418 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2419 | { | |
2420 | uint64_t si; | |
2421 | ||
dd5a0db3 | 2422 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2423 | if (ret < 0) |
2424 | goto error; | |
2425 | return put_u64(si, arg); | |
2426 | } | |
2348ca17 JD |
2427 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2428 | { | |
2429 | uint64_t ts; | |
2430 | ||
dd5a0db3 | 2431 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2432 | if (ret < 0) |
2433 | goto error; | |
2434 | return put_u64(ts, arg); | |
2435 | } | |
5b3cf4f9 JD |
2436 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2437 | { | |
2438 | uint64_t seq; | |
2439 | ||
2440 | ret = ops->sequence_number(config, buf, &seq); | |
2441 | if (ret < 0) | |
2442 | goto error; | |
2443 | return put_u64(seq, arg); | |
2444 | } | |
5594698f JD |
2445 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2446 | { | |
2447 | uint64_t id; | |
2448 | ||
2449 | ret = ops->instance_id(config, buf, &id); | |
2450 | if (ret < 0) | |
2451 | goto error; | |
2452 | return put_u64(id, arg); | |
2453 | } | |
3b731ab1 JD |
2454 | default: |
2455 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2456 | cmd, arg); | |
2457 | } | |
2458 | ||
2459 | error: | |
2460 | return -ENOSYS; | |
ed8d02d6 JD |
2461 | } |
2462 | #endif /* CONFIG_COMPAT */ | |
2463 | ||
2464 | static void lttng_stream_override_ring_buffer_fops(void) | |
2465 | { | |
2466 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2467 | lttng_stream_ring_buffer_file_operations.open = | |
2468 | lib_ring_buffer_file_operations.open; | |
2469 | lttng_stream_ring_buffer_file_operations.release = | |
2470 | lib_ring_buffer_file_operations.release; | |
2471 | lttng_stream_ring_buffer_file_operations.poll = | |
2472 | lib_ring_buffer_file_operations.poll; | |
2473 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2474 | lib_ring_buffer_file_operations.splice_read; | |
2475 | lttng_stream_ring_buffer_file_operations.mmap = | |
2476 | lib_ring_buffer_file_operations.mmap; | |
2477 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2478 | lttng_stream_ring_buffer_ioctl; | |
2479 | lttng_stream_ring_buffer_file_operations.llseek = | |
2480 | lib_ring_buffer_file_operations.llseek; | |
2481 | #ifdef CONFIG_COMPAT | |
2482 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2483 | lttng_stream_ring_buffer_compat_ioctl; | |
2484 | #endif | |
2485 | } | |
2486 | ||
80996790 | 2487 | int __init lttng_abi_init(void) |
baf20995 MD |
2488 | { |
2489 | int ret = 0; | |
2490 | ||
6d2a620c | 2491 | wrapper_vmalloc_sync_all(); |
2754583e | 2492 | lttng_clock_ref(); |
f771eda6 JD |
2493 | |
2494 | ret = lttng_tp_mempool_init(); | |
2495 | if (ret) { | |
2496 | goto error; | |
2497 | } | |
2498 | ||
d29348f7 | 2499 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2500 | <tng_proc_ops, NULL); |
2470a237 | 2501 | |
255e52a4 | 2502 | if (!lttng_proc_dentry) { |
baf20995 MD |
2503 | printk(KERN_ERR "Error creating LTTng control file\n"); |
2504 | ret = -ENOMEM; | |
2505 | goto error; | |
2506 | } | |
ed8d02d6 | 2507 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2508 | return 0; |
ed8d02d6 | 2509 | |
baf20995 | 2510 | error: |
f771eda6 | 2511 | lttng_tp_mempool_destroy(); |
2754583e | 2512 | lttng_clock_unref(); |
baf20995 MD |
2513 | return ret; |
2514 | } | |
2515 | ||
e6e65fcd MD |
2516 | /* No __exit annotation because used by init error path too. */ |
2517 | void lttng_abi_exit(void) | |
baf20995 | 2518 | { |
f771eda6 | 2519 | lttng_tp_mempool_destroy(); |
2754583e | 2520 | lttng_clock_unref(); |
e6a17f26 MD |
2521 | if (lttng_proc_dentry) |
2522 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2523 | } |