Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 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> |
263b6c88 | 33 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
24591303 MD |
34 | #include <ringbuffer/vfs.h> |
35 | #include <ringbuffer/backend.h> | |
36 | #include <ringbuffer/frontend.h> | |
241ae9a8 MD |
37 | #include <wrapper/poll.h> |
38 | #include <wrapper/file.h> | |
39 | #include <wrapper/kref.h> | |
2df37e95 MD |
40 | #include <lttng/string-utils.h> |
41 | #include <lttng/abi.h> | |
42 | #include <lttng/abi-old.h> | |
43 | #include <lttng/events.h> | |
44 | #include <lttng/tracer.h> | |
45 | #include <lttng/tp-mempool.h> | |
24591303 | 46 | #include <ringbuffer/frontend_types.h> |
baf20995 MD |
47 | |
48 | /* | |
49 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 50 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
51 | */ |
52 | ||
e6a17f26 | 53 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
54 | |
55 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
56 | static const struct proc_ops lttng_proc_ops; | |
57 | #else | |
58 | static const struct file_operations lttng_proc_ops; | |
59 | #endif | |
60 | ||
ad1c05e1 | 61 | static const struct file_operations lttng_session_fops; |
750b05f2 | 62 | static const struct file_operations lttng_event_notifier_group_fops; |
ad1c05e1 | 63 | static const struct file_operations lttng_channel_fops; |
5dbbdb43 | 64 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 65 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 66 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 67 | |
9616f0bf | 68 | static int put_u64(uint64_t val, unsigned long arg); |
8b97fd42 | 69 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 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 | ||
750b05f2 FD |
109 | static |
110 | int lttng_abi_create_event_notifier_group(void) | |
111 | { | |
112 | struct lttng_event_notifier_group *event_notifier_group; | |
113 | struct file *event_notifier_group_file; | |
114 | int event_notifier_group_fd, ret; | |
115 | ||
116 | event_notifier_group = lttng_event_notifier_group_create(); | |
117 | if (!event_notifier_group) | |
118 | return -ENOMEM; | |
119 | ||
120 | event_notifier_group_fd = lttng_get_unused_fd(); | |
121 | if (event_notifier_group_fd < 0) { | |
122 | ret = event_notifier_group_fd; | |
123 | goto fd_error; | |
124 | } | |
125 | event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]", | |
126 | <tng_event_notifier_group_fops, | |
127 | event_notifier_group, O_RDWR); | |
128 | if (IS_ERR(event_notifier_group_file)) { | |
129 | ret = PTR_ERR(event_notifier_group_file); | |
130 | goto file_error; | |
131 | } | |
132 | ||
133 | event_notifier_group->file = event_notifier_group_file; | |
134 | fd_install(event_notifier_group_fd, event_notifier_group_file); | |
135 | return event_notifier_group_fd; | |
136 | ||
137 | file_error: | |
138 | put_unused_fd(event_notifier_group_fd); | |
139 | fd_error: | |
140 | lttng_event_notifier_group_destroy(event_notifier_group); | |
141 | return ret; | |
142 | } | |
143 | ||
271b6681 MD |
144 | static |
145 | int lttng_abi_tracepoint_list(void) | |
146 | { | |
147 | struct file *tracepoint_list_file; | |
148 | int file_fd, ret; | |
149 | ||
4ac10b76 | 150 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
151 | if (file_fd < 0) { |
152 | ret = file_fd; | |
153 | goto fd_error; | |
154 | } | |
30f18bf0 | 155 | |
8ee099b6 | 156 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
157 | <tng_tracepoint_list_fops, |
158 | NULL, O_RDWR); | |
159 | if (IS_ERR(tracepoint_list_file)) { | |
160 | ret = PTR_ERR(tracepoint_list_file); | |
161 | goto file_error; | |
162 | } | |
30f18bf0 MD |
163 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
164 | if (ret < 0) | |
165 | goto open_error; | |
271b6681 MD |
166 | fd_install(file_fd, tracepoint_list_file); |
167 | return file_fd; | |
168 | ||
30f18bf0 MD |
169 | open_error: |
170 | fput(tracepoint_list_file); | |
271b6681 MD |
171 | file_error: |
172 | put_unused_fd(file_fd); | |
173 | fd_error: | |
174 | return ret; | |
175 | } | |
176 | ||
f127e61e MD |
177 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
178 | static inline | |
179 | int lttng_abi_syscall_list(void) | |
180 | { | |
181 | return -ENOSYS; | |
182 | } | |
183 | #else | |
184 | static | |
185 | int lttng_abi_syscall_list(void) | |
186 | { | |
187 | struct file *syscall_list_file; | |
188 | int file_fd, ret; | |
189 | ||
190 | file_fd = lttng_get_unused_fd(); | |
191 | if (file_fd < 0) { | |
192 | ret = file_fd; | |
193 | goto fd_error; | |
194 | } | |
195 | ||
196 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
197 | <tng_syscall_list_fops, | |
198 | NULL, O_RDWR); | |
199 | if (IS_ERR(syscall_list_file)) { | |
200 | ret = PTR_ERR(syscall_list_file); | |
201 | goto file_error; | |
202 | } | |
203 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
204 | if (ret < 0) | |
205 | goto open_error; | |
206 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
207 | return file_fd; |
208 | ||
209 | open_error: | |
210 | fput(syscall_list_file); | |
211 | file_error: | |
212 | put_unused_fd(file_fd); | |
213 | fd_error: | |
214 | return ret; | |
215 | } | |
216 | #endif | |
217 | ||
80c16bcf | 218 | static |
6dccd6c1 | 219 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 220 | { |
6dccd6c1 JD |
221 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
222 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
223 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
224 | } |
225 | ||
42cabb80 MD |
226 | static |
227 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
228 | { | |
229 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
230 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
231 | } | |
232 | ||
8070f5c0 MD |
233 | static |
234 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 235 | struct lttng_kernel_context *context_param, |
a90917c3 | 236 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 237 | { |
8070f5c0 MD |
238 | |
239 | if (session->been_active) | |
240 | return -EPERM; | |
241 | ||
6dccd6c1 | 242 | switch (context_param->ctx) { |
12a313a5 | 243 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 244 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
245 | case LTTNG_KERNEL_CONTEXT_PRIO: |
246 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
247 | case LTTNG_KERNEL_CONTEXT_NICE: |
248 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
249 | case LTTNG_KERNEL_CONTEXT_VPID: |
250 | return lttng_add_vpid_to_ctx(ctx); | |
251 | case LTTNG_KERNEL_CONTEXT_TID: | |
252 | return lttng_add_tid_to_ctx(ctx); | |
253 | case LTTNG_KERNEL_CONTEXT_VTID: | |
254 | return lttng_add_vtid_to_ctx(ctx); | |
255 | case LTTNG_KERNEL_CONTEXT_PPID: | |
256 | return lttng_add_ppid_to_ctx(ctx); | |
257 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
258 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 259 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
260 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
261 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
262 | context_param->u.perf_counter.config, | |
263 | context_param->u.perf_counter.name, | |
c24a0d71 | 264 | ctx); |
a2563e83 MD |
265 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
266 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
267 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
268 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
269 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
270 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
271 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
272 | return lttng_add_interruptible_to_ctx(ctx); | |
273 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
274 | return lttng_add_need_reschedule_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
276 | return lttng_add_preemptible_to_ctx(ctx); | |
277 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
278 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
279 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
280 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
281 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
282 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
283 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
284 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
285 | return lttng_add_ipc_ns_to_ctx(ctx); | |
286 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
287 | return lttng_add_mnt_ns_to_ctx(ctx); | |
288 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
289 | return lttng_add_net_ns_to_ctx(ctx); | |
290 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
291 | return lttng_add_pid_ns_to_ctx(ctx); | |
292 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
293 | return lttng_add_user_ns_to_ctx(ctx); | |
294 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
295 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
296 | case LTTNG_KERNEL_CONTEXT_UID: |
297 | return lttng_add_uid_to_ctx(ctx); | |
298 | case LTTNG_KERNEL_CONTEXT_EUID: | |
299 | return lttng_add_euid_to_ctx(ctx); | |
300 | case LTTNG_KERNEL_CONTEXT_SUID: | |
301 | return lttng_add_suid_to_ctx(ctx); | |
302 | case LTTNG_KERNEL_CONTEXT_GID: | |
303 | return lttng_add_gid_to_ctx(ctx); | |
304 | case LTTNG_KERNEL_CONTEXT_EGID: | |
305 | return lttng_add_egid_to_ctx(ctx); | |
306 | case LTTNG_KERNEL_CONTEXT_SGID: | |
307 | return lttng_add_sgid_to_ctx(ctx); | |
308 | case LTTNG_KERNEL_CONTEXT_VUID: | |
309 | return lttng_add_vuid_to_ctx(ctx); | |
310 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
311 | return lttng_add_veuid_to_ctx(ctx); | |
312 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
313 | return lttng_add_vsuid_to_ctx(ctx); | |
314 | case LTTNG_KERNEL_CONTEXT_VGID: | |
315 | return lttng_add_vgid_to_ctx(ctx); | |
316 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
317 | return lttng_add_vegid_to_ctx(ctx); | |
318 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
319 | return lttng_add_vsgid_to_ctx(ctx); | |
876e2e92 MJ |
320 | case LTTNG_KERNEL_CONTEXT_TIME_NS: |
321 | return lttng_add_time_ns_to_ctx(ctx); | |
8070f5c0 MD |
322 | default: |
323 | return -EINVAL; | |
324 | } | |
325 | } | |
326 | ||
ad1c05e1 MD |
327 | /** |
328 | * lttng_ioctl - lttng syscall through ioctl | |
329 | * | |
c0e31d2e | 330 | * @file: the file |
ad1c05e1 MD |
331 | * @cmd: the command |
332 | * @arg: command arg | |
333 | * | |
334 | * This ioctl implements lttng commands: | |
38d024ae | 335 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 336 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
337 | * LTTNG_KERNEL_TRACER_VERSION |
338 | * Returns the LTTng kernel tracer version | |
339 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
340 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
341 | * LTTNG_KERNEL_WAIT_QUIESCENT |
342 | * Returns after all previously running probes have completed | |
42cabb80 MD |
343 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
344 | * Returns the LTTng kernel tracer ABI version | |
750b05f2 FD |
345 | * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE |
346 | * Returns a LTTng event notifier group file descriptor | |
ad1c05e1 MD |
347 | * |
348 | * The returned session will be deleted when its file descriptor is closed. | |
349 | */ | |
350 | static | |
c0e31d2e | 351 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
352 | { |
353 | switch (cmd) { | |
6dccd6c1 | 354 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 355 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 356 | return lttng_abi_create_session(); |
750b05f2 FD |
357 | case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE: |
358 | return lttng_abi_create_event_notifier_group(); | |
6dccd6c1 JD |
359 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
360 | { | |
361 | struct lttng_kernel_tracer_version v; | |
362 | struct lttng_kernel_old_tracer_version oldv; | |
363 | struct lttng_kernel_old_tracer_version *uversion = | |
364 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
365 | ||
366 | lttng_abi_tracer_version(&v); | |
367 | oldv.major = v.major; | |
368 | oldv.minor = v.minor; | |
369 | oldv.patchlevel = v.patchlevel; | |
370 | ||
371 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
372 | return -EFAULT; | |
373 | return 0; | |
374 | } | |
80c16bcf | 375 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
376 | { |
377 | struct lttng_kernel_tracer_version version; | |
378 | struct lttng_kernel_tracer_version *uversion = | |
379 | (struct lttng_kernel_tracer_version __user *) arg; | |
380 | ||
381 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
382 | |
383 | if (copy_to_user(uversion, &version, sizeof(version))) | |
384 | return -EFAULT; | |
385 | return 0; | |
386 | } | |
387 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
388 | { | |
389 | struct lttng_kernel_tracer_abi_version version; | |
390 | struct lttng_kernel_tracer_abi_version *uversion = | |
391 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
392 | ||
393 | lttng_abi_tracer_abi_version(&version); | |
394 | ||
6dccd6c1 JD |
395 | if (copy_to_user(uversion, &version, sizeof(version))) |
396 | return -EFAULT; | |
397 | return 0; | |
398 | } | |
399 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
400 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
401 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
402 | case LTTNG_KERNEL_SYSCALL_LIST: |
403 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 404 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
405 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
406 | synchronize_trace(); | |
407 | return 0; | |
6dccd6c1 JD |
408 | case LTTNG_KERNEL_OLD_CALIBRATE: |
409 | { | |
410 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
411 | (struct lttng_kernel_old_calibrate __user *) arg; | |
412 | struct lttng_kernel_old_calibrate old_calibrate; | |
413 | struct lttng_kernel_calibrate calibrate; | |
414 | int ret; | |
415 | ||
416 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
417 | return -EFAULT; | |
418 | calibrate.type = old_calibrate.type; | |
419 | ret = lttng_calibrate(&calibrate); | |
420 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
421 | return -EFAULT; | |
422 | return ret; | |
423 | } | |
57105fc2 MD |
424 | case LTTNG_KERNEL_CALIBRATE: |
425 | { | |
3db41b2c MD |
426 | struct lttng_kernel_calibrate __user *ucalibrate = |
427 | (struct lttng_kernel_calibrate __user *) arg; | |
428 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
429 | int ret; |
430 | ||
431 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
432 | return -EFAULT; | |
433 | ret = lttng_calibrate(&calibrate); | |
434 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
435 | return -EFAULT; | |
436 | return ret; | |
437 | } | |
ad1c05e1 MD |
438 | default: |
439 | return -ENOIOCTLCMD; | |
440 | } | |
441 | } | |
442 | ||
059de147 MJ |
443 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
444 | static const struct proc_ops lttng_proc_ops = { | |
445 | .proc_ioctl = lttng_ioctl, | |
446 | #ifdef CONFIG_COMPAT | |
447 | .proc_compat_ioctl = lttng_ioctl, | |
448 | #endif /* CONFIG_COMPAT */ | |
449 | }; | |
450 | #else | |
451 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 452 | .owner = THIS_MODULE, |
ad1c05e1 MD |
453 | .unlocked_ioctl = lttng_ioctl, |
454 | #ifdef CONFIG_COMPAT | |
03037b98 | 455 | .compat_ioctl = lttng_ioctl, |
059de147 | 456 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 457 | }; |
059de147 | 458 | #endif |
ad1c05e1 | 459 | |
5dbbdb43 | 460 | static |
c0e31d2e | 461 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 462 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 463 | enum channel_type channel_type) |
baf20995 | 464 | { |
a90917c3 | 465 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 466 | const struct file_operations *fops = NULL; |
5dbbdb43 | 467 | const char *transport_name; |
a90917c3 | 468 | struct lttng_channel *chan; |
c0e31d2e | 469 | struct file *chan_file; |
baf20995 | 470 | int chan_fd; |
ad1c05e1 | 471 | int ret = 0; |
baf20995 | 472 | |
4ac10b76 | 473 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
474 | if (chan_fd < 0) { |
475 | ret = chan_fd; | |
476 | goto fd_error; | |
477 | } | |
88dfd899 MD |
478 | switch (channel_type) { |
479 | case PER_CPU_CHANNEL: | |
480 | fops = <tng_channel_fops; | |
481 | break; | |
482 | case METADATA_CHANNEL: | |
483 | fops = <tng_metadata_fops; | |
484 | break; | |
485 | } | |
2470a237 | 486 | |
c0e31d2e | 487 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 488 | fops, |
03037b98 | 489 | NULL, O_RDWR); |
c0e31d2e MD |
490 | if (IS_ERR(chan_file)) { |
491 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
492 | goto file_error; |
493 | } | |
5dbbdb43 MD |
494 | switch (channel_type) { |
495 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
496 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
497 | transport_name = chan_param->overwrite ? | |
96ba7208 | 498 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
499 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
500 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
501 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
502 | } else { | |
503 | return -EINVAL; | |
504 | } | |
5dbbdb43 | 505 | break; |
5dbbdb43 | 506 | case METADATA_CHANNEL: |
6dccd6c1 | 507 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 508 | transport_name = "relay-metadata"; |
6dccd6c1 | 509 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
510 | transport_name = "relay-metadata-mmap"; |
511 | else | |
512 | return -EINVAL; | |
5dbbdb43 MD |
513 | break; |
514 | default: | |
515 | transport_name = "<unknown>"; | |
516 | break; | |
517 | } | |
98d7281c MJ |
518 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
519 | ret = -EOVERFLOW; | |
9c1f4643 MD |
520 | goto refcount_error; |
521 | } | |
03037b98 MD |
522 | /* |
523 | * We tolerate no failure path after channel creation. It will stay | |
524 | * invariant for the rest of the session. | |
525 | */ | |
a90917c3 | 526 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
527 | chan_param->subbuf_size, |
528 | chan_param->num_subbuf, | |
529 | chan_param->switch_timer_interval, | |
d83004aa JD |
530 | chan_param->read_timer_interval, |
531 | channel_type); | |
03037b98 | 532 | if (!chan) { |
f3d01b96 | 533 | ret = -EINVAL; |
03037b98 MD |
534 | goto chan_error; |
535 | } | |
11b5a3c2 | 536 | chan->file = chan_file; |
c0e31d2e MD |
537 | chan_file->private_data = chan; |
538 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 539 | |
baf20995 MD |
540 | return chan_fd; |
541 | ||
03037b98 | 542 | chan_error: |
9c1f4643 MD |
543 | atomic_long_dec(&session_file->f_count); |
544 | refcount_error: | |
c0e31d2e | 545 | fput(chan_file); |
baf20995 MD |
546 | file_error: |
547 | put_unused_fd(chan_fd); | |
548 | fd_error: | |
baf20995 MD |
549 | return ret; |
550 | } | |
551 | ||
7f859fbf JR |
552 | static |
553 | int lttng_abi_session_set_name(struct lttng_session *session, | |
554 | struct lttng_kernel_session_name *name) | |
555 | { | |
556 | size_t len; | |
557 | ||
558 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
559 | ||
560 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
561 | /* Name is too long/malformed */ | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | strcpy(session->name, name->name); | |
566 | return 0; | |
567 | } | |
568 | ||
1c88f269 JR |
569 | static |
570 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
571 | struct lttng_kernel_session_creation_time *time) | |
572 | { | |
573 | size_t len; | |
574 | ||
575 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
576 | ||
577 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
578 | /* Time is too long/malformed */ | |
579 | return -EINVAL; | |
580 | } | |
581 | ||
582 | strcpy(session->creation_time, time->iso8601); | |
583 | return 0; | |
584 | } | |
585 | ||
d1f652f8 MD |
586 | static |
587 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
588 | { | |
589 | switch (tracker->type) { | |
590 | case LTTNG_KERNEL_TRACKER_PID: | |
591 | return TRACKER_PID; | |
592 | case LTTNG_KERNEL_TRACKER_VPID: | |
593 | return TRACKER_VPID; | |
594 | case LTTNG_KERNEL_TRACKER_UID: | |
595 | return TRACKER_UID; | |
596 | case LTTNG_KERNEL_TRACKER_VUID: | |
597 | return TRACKER_VUID; | |
598 | case LTTNG_KERNEL_TRACKER_GID: | |
599 | return TRACKER_GID; | |
600 | case LTTNG_KERNEL_TRACKER_VGID: | |
601 | return TRACKER_VGID; | |
602 | default: | |
603 | return TRACKER_UNKNOWN; | |
604 | } | |
605 | } | |
606 | ||
baf20995 | 607 | /** |
ad1c05e1 | 608 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 609 | * |
c0e31d2e | 610 | * @file: the file |
baf20995 MD |
611 | * @cmd: the command |
612 | * @arg: command arg | |
613 | * | |
614 | * This ioctl implements lttng commands: | |
38d024ae | 615 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 616 | * Returns a LTTng channel file descriptor |
e64957da MD |
617 | * LTTNG_KERNEL_ENABLE |
618 | * Enables tracing for a session (weak enable) | |
619 | * LTTNG_KERNEL_DISABLE | |
620 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
621 | * LTTNG_KERNEL_METADATA |
622 | * Returns a LTTng metadata file descriptor | |
e0130fab | 623 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 624 | * Add PID to session PID tracker |
e0130fab | 625 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
626 | * Remove PID from session PID tracker |
627 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
628 | * Add ID to tracker | |
629 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
630 | * Remove ID from tracker | |
ad1c05e1 MD |
631 | * |
632 | * The returned channel will be deleted when its file descriptor is closed. | |
633 | */ | |
634 | static | |
c0e31d2e | 635 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 636 | { |
a90917c3 | 637 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
638 | struct lttng_kernel_channel chan_param; |
639 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 640 | |
ad1c05e1 | 641 | switch (cmd) { |
6dccd6c1 JD |
642 | case LTTNG_KERNEL_OLD_CHANNEL: |
643 | { | |
6dccd6c1 JD |
644 | if (copy_from_user(&old_chan_param, |
645 | (struct lttng_kernel_old_channel __user *) arg, | |
646 | sizeof(struct lttng_kernel_old_channel))) | |
647 | return -EFAULT; | |
648 | chan_param.overwrite = old_chan_param.overwrite; | |
649 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
650 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
651 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
652 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
653 | chan_param.output = old_chan_param.output; | |
654 | ||
655 | return lttng_abi_create_channel(file, &chan_param, | |
656 | PER_CPU_CHANNEL); | |
657 | } | |
38d024ae | 658 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 659 | { |
6dccd6c1 | 660 | if (copy_from_user(&chan_param, |
38d024ae | 661 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
662 | sizeof(struct lttng_kernel_channel))) |
663 | return -EFAULT; | |
664 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 665 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
666 | } |
667 | case LTTNG_KERNEL_OLD_SESSION_START: | |
668 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 669 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 670 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 671 | return lttng_session_enable(session); |
6dccd6c1 JD |
672 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
673 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 674 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 675 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 676 | return lttng_session_disable(session); |
6dccd6c1 JD |
677 | case LTTNG_KERNEL_OLD_METADATA: |
678 | { | |
6dccd6c1 JD |
679 | if (copy_from_user(&old_chan_param, |
680 | (struct lttng_kernel_old_channel __user *) arg, | |
681 | sizeof(struct lttng_kernel_old_channel))) | |
682 | return -EFAULT; | |
683 | chan_param.overwrite = old_chan_param.overwrite; | |
684 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
685 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
686 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
687 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
688 | chan_param.output = old_chan_param.output; | |
689 | ||
690 | return lttng_abi_create_channel(file, &chan_param, | |
691 | METADATA_CHANNEL); | |
692 | } | |
38d024ae | 693 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 694 | { |
6dccd6c1 JD |
695 | if (copy_from_user(&chan_param, |
696 | (struct lttng_kernel_channel __user *) arg, | |
697 | sizeof(struct lttng_kernel_channel))) | |
698 | return -EFAULT; | |
699 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 700 | METADATA_CHANNEL); |
6dccd6c1 | 701 | } |
e0130fab | 702 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 703 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 704 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
705 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
706 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
707 | { | |
708 | struct lttng_kernel_tracker_args tracker; | |
709 | enum tracker_type tracker_type; | |
710 | ||
711 | if (copy_from_user(&tracker, | |
712 | (struct lttng_kernel_tracker_args __user *) arg, | |
713 | sizeof(struct lttng_kernel_tracker_args))) | |
714 | return -EFAULT; | |
715 | tracker_type = get_tracker_type(&tracker); | |
716 | if (tracker_type == TRACKER_UNKNOWN) | |
717 | return -EINVAL; | |
718 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
719 | } | |
720 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
721 | { | |
722 | struct lttng_kernel_tracker_args tracker; | |
723 | enum tracker_type tracker_type; | |
724 | ||
725 | if (copy_from_user(&tracker, | |
726 | (struct lttng_kernel_tracker_args __user *) arg, | |
727 | sizeof(struct lttng_kernel_tracker_args))) | |
728 | return -EFAULT; | |
729 | tracker_type = get_tracker_type(&tracker); | |
730 | if (tracker_type == TRACKER_UNKNOWN) | |
731 | return -EINVAL; | |
732 | return lttng_session_untrack_id(session, tracker_type, | |
733 | tracker.id); | |
734 | } | |
7e6f9ef6 | 735 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
736 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
737 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
738 | { | |
739 | struct lttng_kernel_tracker_args tracker; | |
740 | enum tracker_type tracker_type; | |
741 | ||
742 | if (copy_from_user(&tracker, | |
743 | (struct lttng_kernel_tracker_args __user *) arg, | |
744 | sizeof(struct lttng_kernel_tracker_args))) | |
745 | return -EFAULT; | |
746 | tracker_type = get_tracker_type(&tracker); | |
747 | if (tracker_type == TRACKER_UNKNOWN) | |
748 | return -EINVAL; | |
749 | return lttng_session_list_tracker_ids(session, tracker_type); | |
750 | } | |
9616f0bf JD |
751 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
752 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
753 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
754 | return lttng_session_statedump(session); | |
7f859fbf JR |
755 | case LTTNG_KERNEL_SESSION_SET_NAME: |
756 | { | |
757 | struct lttng_kernel_session_name name; | |
758 | ||
759 | if (copy_from_user(&name, | |
760 | (struct lttng_kernel_session_name __user *) arg, | |
761 | sizeof(struct lttng_kernel_session_name))) | |
762 | return -EFAULT; | |
763 | return lttng_abi_session_set_name(session, &name); | |
764 | } | |
1c88f269 JR |
765 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
766 | { | |
767 | struct lttng_kernel_session_creation_time time; | |
768 | ||
769 | if (copy_from_user(&time, | |
770 | (struct lttng_kernel_session_creation_time __user *) arg, | |
771 | sizeof(struct lttng_kernel_session_creation_time))) | |
772 | return -EFAULT; | |
773 | return lttng_abi_session_set_creation_time(session, &time); | |
774 | } | |
ad1c05e1 MD |
775 | default: |
776 | return -ENOIOCTLCMD; | |
777 | } | |
778 | } | |
779 | ||
03037b98 MD |
780 | /* |
781 | * Called when the last file reference is dropped. | |
782 | * | |
783 | * Big fat note: channels and events are invariant for the whole session after | |
784 | * their creation. So this session destruction also destroys all channel and | |
785 | * event structures specific to this session (they are not destroyed when their | |
786 | * individual file is released). | |
787 | */ | |
ad1c05e1 | 788 | static |
03037b98 | 789 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 790 | { |
a90917c3 | 791 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
792 | |
793 | if (session) | |
a90917c3 | 794 | lttng_session_destroy(session); |
11b5a3c2 | 795 | return 0; |
ad1c05e1 | 796 | } |
ad1c05e1 MD |
797 | |
798 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 799 | .owner = THIS_MODULE, |
03037b98 | 800 | .release = lttng_session_release, |
ad1c05e1 MD |
801 | .unlocked_ioctl = lttng_session_ioctl, |
802 | #ifdef CONFIG_COMPAT | |
03037b98 | 803 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 804 | #endif |
11b5a3c2 | 805 | }; |
ad1c05e1 | 806 | |
d83004aa JD |
807 | /** |
808 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
809 | * @filp: the file | |
810 | * @wait: poll table | |
811 | * | |
812 | * Handles the poll operations for the metadata channels. | |
813 | */ | |
ad1c05e1 | 814 | static |
d83004aa JD |
815 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
816 | poll_table *wait) | |
817 | { | |
818 | struct lttng_metadata_stream *stream = filp->private_data; | |
819 | struct lib_ring_buffer *buf = stream->priv; | |
820 | int finalized; | |
821 | unsigned int mask = 0; | |
822 | ||
823 | if (filp->f_mode & FMODE_READ) { | |
824 | poll_wait_set_exclusive(wait); | |
825 | poll_wait(filp, &stream->read_wait, wait); | |
826 | ||
827 | finalized = stream->finalized; | |
828 | ||
829 | /* | |
830 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
831 | * ordering finalized load before offsets loads. | |
832 | */ | |
833 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
834 | ||
835 | if (finalized) | |
836 | mask |= POLLHUP; | |
837 | ||
92d9f5e6 | 838 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 839 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 840 | stream->metadata_out) |
d83004aa | 841 | mask |= POLLIN; |
92d9f5e6 | 842 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
843 | } |
844 | ||
845 | return mask; | |
846 | } | |
847 | ||
f613e3e6 MD |
848 | static |
849 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
850 | unsigned int cmd, unsigned long arg) | |
851 | { | |
852 | struct lttng_metadata_stream *stream = filp->private_data; | |
853 | ||
854 | stream->metadata_out = stream->metadata_in; | |
855 | } | |
856 | ||
d1344afa JD |
857 | /* |
858 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
859 | * the consumer receives the content of the metadata cache unchanged. This is | |
860 | * different from the metadata_regenerate where the offset from epoch is | |
861 | * resampled, here we want the exact same content as the last time the metadata | |
862 | * was generated. This command is only possible if all the metadata written | |
863 | * in the cache has been output to the metadata stream to avoid corrupting the | |
864 | * metadata file. | |
865 | * | |
866 | * Return 0 on success, a negative value on error. | |
867 | */ | |
868 | static | |
869 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
870 | { | |
871 | int ret; | |
872 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
873 | ||
874 | mutex_lock(&cache->lock); | |
875 | if (stream->metadata_out != cache->metadata_written) { | |
876 | ret = -EBUSY; | |
877 | goto end; | |
878 | } | |
879 | stream->metadata_out = 0; | |
880 | stream->metadata_in = 0; | |
881 | wake_up_interruptible(&stream->read_wait); | |
882 | ret = 0; | |
883 | ||
884 | end: | |
885 | mutex_unlock(&cache->lock); | |
886 | return ret; | |
887 | } | |
888 | ||
d83004aa JD |
889 | static |
890 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
891 | unsigned int cmd, unsigned long arg) | |
892 | { | |
893 | int ret; | |
894 | struct lttng_metadata_stream *stream = filp->private_data; | |
895 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
896 | unsigned int rb_cmd; |
897 | bool coherent; | |
898 | ||
899 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
900 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
901 | else | |
902 | rb_cmd = cmd; | |
d83004aa JD |
903 | |
904 | switch (cmd) { | |
d83004aa JD |
905 | case RING_BUFFER_GET_NEXT_SUBBUF: |
906 | { | |
35097f36 JD |
907 | struct lttng_metadata_stream *stream = filp->private_data; |
908 | struct lib_ring_buffer *buf = stream->priv; | |
909 | struct channel *chan = buf->backend.chan; | |
910 | ||
8b97fd42 | 911 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
912 | if (ret > 0) { |
913 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
914 | ret = 0; | |
915 | } else if (ret < 0) | |
d83004aa JD |
916 | goto err; |
917 | break; | |
918 | } | |
f613e3e6 MD |
919 | case RING_BUFFER_GET_SUBBUF: |
920 | { | |
921 | /* | |
922 | * Random access is not allowed for metadata channel. | |
923 | */ | |
924 | return -ENOSYS; | |
925 | } | |
c6f05468 | 926 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
927 | case RING_BUFFER_FLUSH: |
928 | { | |
929 | struct lttng_metadata_stream *stream = filp->private_data; | |
930 | struct lib_ring_buffer *buf = stream->priv; | |
931 | struct channel *chan = buf->backend.chan; | |
932 | ||
933 | /* | |
934 | * Before doing the actual ring buffer flush, write up to one | |
935 | * packet of metadata in the ring buffer. | |
936 | */ | |
8b97fd42 | 937 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
938 | if (ret < 0) |
939 | goto err; | |
940 | break; | |
941 | } | |
9616f0bf JD |
942 | case RING_BUFFER_GET_METADATA_VERSION: |
943 | { | |
944 | struct lttng_metadata_stream *stream = filp->private_data; | |
945 | ||
946 | return put_u64(stream->version, arg); | |
947 | } | |
d1344afa JD |
948 | case RING_BUFFER_METADATA_CACHE_DUMP: |
949 | { | |
950 | struct lttng_metadata_stream *stream = filp->private_data; | |
951 | ||
952 | return lttng_metadata_cache_dump(stream); | |
953 | } | |
8b97fd42 MD |
954 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
955 | { | |
956 | struct lttng_metadata_stream *stream = filp->private_data; | |
957 | struct lib_ring_buffer *buf = stream->priv; | |
958 | struct channel *chan = buf->backend.chan; | |
959 | ||
960 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
961 | if (ret > 0) { | |
962 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
963 | ret = 0; | |
964 | } else if (ret < 0) { | |
965 | goto err; | |
966 | } | |
967 | break; | |
968 | } | |
d83004aa JD |
969 | default: |
970 | break; | |
971 | } | |
f613e3e6 MD |
972 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
973 | ||
d83004aa | 974 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 975 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
976 | if (ret < 0) |
977 | goto err; | |
d83004aa | 978 | |
f613e3e6 MD |
979 | switch (cmd) { |
980 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
981 | { | |
982 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
983 | cmd, arg); | |
984 | break; | |
985 | } | |
8b97fd42 MD |
986 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
987 | { | |
988 | return put_u32(coherent, arg); | |
989 | } | |
f613e3e6 MD |
990 | default: |
991 | break; | |
992 | } | |
d83004aa JD |
993 | err: |
994 | return ret; | |
995 | } | |
996 | ||
aeb9064d | 997 | #ifdef CONFIG_COMPAT |
d83004aa JD |
998 | static |
999 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
1000 | unsigned int cmd, unsigned long arg) | |
1001 | { | |
1002 | int ret; | |
1003 | struct lttng_metadata_stream *stream = filp->private_data; | |
1004 | struct lib_ring_buffer *buf = stream->priv; | |
8b97fd42 MD |
1005 | unsigned int rb_cmd; |
1006 | bool coherent; | |
1007 | ||
1008 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
1009 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
1010 | else | |
1011 | rb_cmd = cmd; | |
d83004aa JD |
1012 | |
1013 | switch (cmd) { | |
d83004aa JD |
1014 | case RING_BUFFER_GET_NEXT_SUBBUF: |
1015 | { | |
35097f36 JD |
1016 | struct lttng_metadata_stream *stream = filp->private_data; |
1017 | struct lib_ring_buffer *buf = stream->priv; | |
1018 | struct channel *chan = buf->backend.chan; | |
1019 | ||
8b97fd42 | 1020 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
1021 | if (ret > 0) { |
1022 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1023 | ret = 0; | |
1024 | } else if (ret < 0) | |
d83004aa JD |
1025 | goto err; |
1026 | break; | |
1027 | } | |
f613e3e6 MD |
1028 | case RING_BUFFER_GET_SUBBUF: |
1029 | { | |
1030 | /* | |
1031 | * Random access is not allowed for metadata channel. | |
1032 | */ | |
1033 | return -ENOSYS; | |
1034 | } | |
c6f05468 | 1035 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
1036 | case RING_BUFFER_FLUSH: |
1037 | { | |
1038 | struct lttng_metadata_stream *stream = filp->private_data; | |
1039 | struct lib_ring_buffer *buf = stream->priv; | |
1040 | struct channel *chan = buf->backend.chan; | |
1041 | ||
1042 | /* | |
1043 | * Before doing the actual ring buffer flush, write up to one | |
1044 | * packet of metadata in the ring buffer. | |
1045 | */ | |
8b97fd42 | 1046 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1047 | if (ret < 0) |
1048 | goto err; | |
1049 | break; | |
1050 | } | |
1051 | case RING_BUFFER_GET_METADATA_VERSION: | |
1052 | { | |
1053 | struct lttng_metadata_stream *stream = filp->private_data; | |
1054 | ||
1055 | return put_u64(stream->version, arg); | |
1056 | } | |
d1344afa JD |
1057 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1058 | { | |
1059 | struct lttng_metadata_stream *stream = filp->private_data; | |
1060 | ||
1061 | return lttng_metadata_cache_dump(stream); | |
1062 | } | |
8b97fd42 MD |
1063 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1064 | { | |
1065 | struct lttng_metadata_stream *stream = filp->private_data; | |
1066 | struct lib_ring_buffer *buf = stream->priv; | |
1067 | struct channel *chan = buf->backend.chan; | |
1068 | ||
1069 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1070 | if (ret > 0) { | |
1071 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1072 | ret = 0; | |
1073 | } else if (ret < 0) { | |
1074 | goto err; | |
1075 | } | |
1076 | break; | |
1077 | } | |
d83004aa JD |
1078 | default: |
1079 | break; | |
1080 | } | |
f613e3e6 MD |
1081 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1082 | ||
d83004aa | 1083 | /* Performing lib ring buffer ioctl after our own. */ |
8b97fd42 | 1084 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1085 | if (ret < 0) |
1086 | goto err; | |
d83004aa | 1087 | |
f613e3e6 MD |
1088 | switch (cmd) { |
1089 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1090 | { | |
1091 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1092 | cmd, arg); | |
1093 | break; | |
1094 | } | |
8b97fd42 MD |
1095 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1096 | { | |
1097 | return put_u32(coherent, arg); | |
1098 | } | |
f613e3e6 MD |
1099 | default: |
1100 | break; | |
1101 | } | |
d83004aa JD |
1102 | err: |
1103 | return ret; | |
1104 | } | |
aeb9064d | 1105 | #endif |
d83004aa | 1106 | |
b3b8072b MD |
1107 | /* |
1108 | * This is not used by anonymous file descriptors. This code is left | |
1109 | * there if we ever want to implement an inode with open() operation. | |
1110 | */ | |
d83004aa JD |
1111 | static |
1112 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1113 | { | |
1114 | struct lttng_metadata_stream *stream = inode->i_private; | |
1115 | struct lib_ring_buffer *buf = stream->priv; | |
1116 | ||
1117 | file->private_data = buf; | |
b3b8072b MD |
1118 | /* |
1119 | * Since life-time of metadata cache differs from that of | |
1120 | * session, we need to keep our own reference on the transport. | |
1121 | */ | |
1122 | if (!try_module_get(stream->transport->owner)) { | |
5a15f70c | 1123 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1124 | return -EBUSY; |
1125 | } | |
d83004aa JD |
1126 | return lib_ring_buffer_open(inode, file, buf); |
1127 | } | |
1128 | ||
1129 | static | |
1130 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1131 | { | |
1132 | struct lttng_metadata_stream *stream = file->private_data; | |
1133 | struct lib_ring_buffer *buf = stream->priv; | |
1134 | ||
92143b2c MD |
1135 | mutex_lock(&stream->metadata_cache->lock); |
1136 | list_del(&stream->list); | |
1137 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1138 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1139 | module_put(stream->transport->owner); |
92143b2c | 1140 | kfree(stream); |
d83004aa JD |
1141 | return lib_ring_buffer_release(inode, file, buf); |
1142 | } | |
1143 | ||
1144 | static | |
1145 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1146 | struct pipe_inode_info *pipe, size_t len, | |
1147 | unsigned int flags) | |
1148 | { | |
1149 | struct lttng_metadata_stream *stream = in->private_data; | |
1150 | struct lib_ring_buffer *buf = stream->priv; | |
1151 | ||
1152 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1153 | flags, buf); | |
1154 | } | |
1155 | ||
1156 | static | |
1157 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1158 | struct vm_area_struct *vma) | |
1159 | { | |
1160 | struct lttng_metadata_stream *stream = filp->private_data; | |
1161 | struct lib_ring_buffer *buf = stream->priv; | |
1162 | ||
1163 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1164 | } | |
1165 | ||
1166 | static | |
1167 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1168 | .owner = THIS_MODULE, | |
1169 | .open = lttng_metadata_ring_buffer_open, | |
1170 | .release = lttng_metadata_ring_buffer_release, | |
1171 | .poll = lttng_metadata_ring_buffer_poll, | |
1172 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1173 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1174 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1175 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1176 | #ifdef CONFIG_COMPAT | |
1177 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1178 | #endif | |
1179 | }; | |
1180 | ||
1181 | static | |
1182 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
a3fcd499 | 1183 | const struct file_operations *fops, const char *name) |
ad1c05e1 | 1184 | { |
ad1c05e1 | 1185 | int stream_fd, ret; |
11b5a3c2 | 1186 | struct file *stream_file; |
ad1c05e1 | 1187 | |
4ac10b76 | 1188 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1189 | if (stream_fd < 0) { |
1190 | ret = stream_fd; | |
1191 | goto fd_error; | |
1192 | } | |
a3fcd499 | 1193 | stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR); |
c0e31d2e MD |
1194 | if (IS_ERR(stream_file)) { |
1195 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1196 | goto file_error; |
1197 | } | |
409453cb MD |
1198 | /* |
1199 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1200 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1201 | * file descriptor, so we set FMODE_PREAD here. | |
1202 | */ | |
d7b6f197 | 1203 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1204 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1205 | /* |
1206 | * The stream holds a reference to the channel within the generic ring | |
1207 | * buffer library, so no need to hold a refcount on the channel and | |
1208 | * session files here. | |
1209 | */ | |
ad1c05e1 MD |
1210 | return stream_fd; |
1211 | ||
1212 | file_error: | |
1213 | put_unused_fd(stream_fd); | |
d83004aa JD |
1214 | fd_error: |
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | static | |
1219 | int lttng_abi_open_stream(struct file *channel_file) | |
1220 | { | |
1221 | struct lttng_channel *channel = channel_file->private_data; | |
1222 | struct lib_ring_buffer *buf; | |
1223 | int ret; | |
1224 | void *stream_priv; | |
1225 | ||
1226 | buf = channel->ops->buffer_read_open(channel->chan); | |
1227 | if (!buf) | |
1228 | return -ENOENT; | |
1229 | ||
1230 | stream_priv = buf; | |
1231 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
a3fcd499 MD |
1232 | <tng_stream_ring_buffer_file_operations, |
1233 | "[lttng_stream]"); | |
d83004aa JD |
1234 | if (ret < 0) |
1235 | goto fd_error; | |
1236 | ||
1237 | return ret; | |
1238 | ||
1239 | fd_error: | |
1240 | channel->ops->buffer_read_close(buf); | |
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | static | |
1245 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1246 | { | |
1247 | struct lttng_channel *channel = channel_file->private_data; | |
1248 | struct lttng_session *session = channel->session; | |
1249 | struct lib_ring_buffer *buf; | |
1250 | int ret; | |
1251 | struct lttng_metadata_stream *metadata_stream; | |
1252 | void *stream_priv; | |
1253 | ||
1254 | buf = channel->ops->buffer_read_open(channel->chan); | |
1255 | if (!buf) | |
1256 | return -ENOENT; | |
1257 | ||
1258 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1259 | GFP_KERNEL); | |
b3b8072b MD |
1260 | if (!metadata_stream) { |
1261 | ret = -ENOMEM; | |
1262 | goto nomem; | |
1263 | } | |
d83004aa JD |
1264 | metadata_stream->metadata_cache = session->metadata_cache; |
1265 | init_waitqueue_head(&metadata_stream->read_wait); | |
1266 | metadata_stream->priv = buf; | |
1267 | stream_priv = metadata_stream; | |
b3b8072b | 1268 | metadata_stream->transport = channel->transport; |
8b97fd42 MD |
1269 | /* Initial state is an empty metadata, considered as incoherent. */ |
1270 | metadata_stream->coherent = false; | |
b3b8072b MD |
1271 | |
1272 | /* | |
1273 | * Since life-time of metadata cache differs from that of | |
1274 | * session, we need to keep our own reference on the transport. | |
1275 | */ | |
1276 | if (!try_module_get(metadata_stream->transport->owner)) { | |
5a15f70c | 1277 | printk(KERN_WARNING "LTTng: Can't lock transport module.\n"); |
b3b8072b MD |
1278 | ret = -EINVAL; |
1279 | goto notransport; | |
1280 | } | |
1281 | ||
901aaa5f FD |
1282 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1283 | ret = -EOVERFLOW; | |
9c1f4643 | 1284 | goto kref_error; |
901aaa5f FD |
1285 | } |
1286 | ||
d83004aa | 1287 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
a3fcd499 MD |
1288 | <tng_metadata_ring_buffer_file_operations, |
1289 | "[lttng_metadata_stream]"); | |
d83004aa JD |
1290 | if (ret < 0) |
1291 | goto fd_error; | |
1292 | ||
92143b2c | 1293 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1294 | list_add(&metadata_stream->list, |
1295 | &session->metadata_cache->metadata_stream); | |
92143b2c | 1296 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1297 | return ret; |
1298 | ||
ad1c05e1 | 1299 | fd_error: |
9c1f4643 MD |
1300 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1301 | kref_error: | |
b3b8072b MD |
1302 | module_put(metadata_stream->transport->owner); |
1303 | notransport: | |
1304 | kfree(metadata_stream); | |
1305 | nomem: | |
11b5a3c2 | 1306 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1307 | return ret; |
1308 | } | |
1309 | ||
badfe9f5 MD |
1310 | static |
1311 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1312 | { | |
1313 | /* Limit ABI to implemented features. */ | |
1314 | switch (event_param->instrumentation) { | |
1315 | case LTTNG_KERNEL_SYSCALL: | |
1316 | switch (event_param->u.syscall.entryexit) { | |
1317 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1318 | break; | |
1319 | default: | |
1320 | return -EINVAL; | |
1321 | } | |
1322 | switch (event_param->u.syscall.abi) { | |
1323 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1324 | break; | |
1325 | default: | |
1326 | return -EINVAL; | |
1327 | } | |
1328 | switch (event_param->u.syscall.match) { | |
1329 | case LTTNG_SYSCALL_MATCH_NAME: | |
1330 | break; | |
1331 | default: | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | break; | |
1335 | ||
1336 | case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */ | |
1337 | case LTTNG_KERNEL_KPROBE: /* Fallthrough */ | |
1338 | case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */ | |
1339 | case LTTNG_KERNEL_NOOP: /* Fallthrough */ | |
1340 | case LTTNG_KERNEL_UPROBE: | |
1341 | break; | |
1342 | ||
1343 | case LTTNG_KERNEL_FUNCTION: /* Fallthrough */ | |
1344 | default: | |
1345 | return -EINVAL; | |
1346 | } | |
1347 | return 0; | |
1348 | } | |
1349 | ||
653fe716 | 1350 | static |
c0e31d2e | 1351 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1352 | struct lttng_kernel_event *event_param) |
653fe716 | 1353 | { |
a90917c3 | 1354 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1355 | int event_fd, ret; |
11b5a3c2 | 1356 | struct file *event_file; |
3c997079 | 1357 | void *priv; |
653fe716 | 1358 | |
6dccd6c1 JD |
1359 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1360 | switch (event_param->instrumentation) { | |
7371f44c | 1361 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1362 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1363 | break; |
ab2277d6 | 1364 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1365 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1366 | break; |
ab2277d6 | 1367 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1368 | WARN_ON_ONCE(1); |
1369 | /* Not implemented. */ | |
e0a7a7c4 MD |
1370 | break; |
1371 | default: | |
1372 | break; | |
1373 | } | |
33a39a3c MD |
1374 | event_fd = lttng_get_unused_fd(); |
1375 | if (event_fd < 0) { | |
1376 | ret = event_fd; | |
1377 | goto fd_error; | |
1378 | } | |
1379 | event_file = anon_inode_getfile("[lttng_event]", | |
1380 | <tng_event_fops, | |
1381 | NULL, O_RDWR); | |
1382 | if (IS_ERR(event_file)) { | |
1383 | ret = PTR_ERR(event_file); | |
1384 | goto file_error; | |
1385 | } | |
9c1f4643 | 1386 | /* The event holds a reference on the channel */ |
98d7281c | 1387 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1388 | ret = -EOVERFLOW; |
9c1f4643 MD |
1389 | goto refcount_error; |
1390 | } | |
badfe9f5 MD |
1391 | ret = lttng_abi_validate_event_param(event_param); |
1392 | if (ret) | |
1393 | goto event_error; | |
33a39a3c MD |
1394 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1395 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
b2bc0bc8 | 1396 | struct lttng_event_enabler *event_enabler; |
33a39a3c | 1397 | |
4993071a PP |
1398 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1399 | /* | |
1400 | * If the event name is a star globbing pattern, | |
1401 | * we create the special star globbing enabler. | |
1402 | */ | |
b2bc0bc8 | 1403 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB, |
33a39a3c | 1404 | event_param, channel); |
3c997079 | 1405 | } else { |
b2bc0bc8 | 1406 | event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
33a39a3c | 1407 | event_param, channel); |
1ec65de1 | 1408 | } |
b2bc0bc8 | 1409 | priv = event_enabler; |
33a39a3c MD |
1410 | } else { |
1411 | struct lttng_event *event; | |
4ee2453d | 1412 | |
33a39a3c MD |
1413 | /* |
1414 | * We tolerate no failure path after event creation. It | |
1415 | * will stay invariant for the rest of the session. | |
1416 | */ | |
1417 | event = lttng_event_create(channel, event_param, | |
1418 | NULL, NULL, | |
1419 | event_param->instrumentation); | |
1420 | WARN_ON_ONCE(!event); | |
1421 | if (IS_ERR(event)) { | |
1422 | ret = PTR_ERR(event); | |
1423 | goto event_error; | |
80f87dd2 | 1424 | } |
33a39a3c | 1425 | priv = event; |
03037b98 | 1426 | } |
33a39a3c MD |
1427 | event_file->private_data = priv; |
1428 | fd_install(event_fd, event_file); | |
653fe716 MD |
1429 | return event_fd; |
1430 | ||
03037b98 | 1431 | event_error: |
9c1f4643 MD |
1432 | atomic_long_dec(&channel_file->f_count); |
1433 | refcount_error: | |
c0e31d2e | 1434 | fput(event_file); |
653fe716 MD |
1435 | file_error: |
1436 | put_unused_fd(event_fd); | |
1437 | fd_error: | |
653fe716 MD |
1438 | return ret; |
1439 | } | |
ad1c05e1 | 1440 | |
750b05f2 FD |
1441 | static |
1442 | long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd, | |
1443 | unsigned long arg) | |
1444 | { | |
1445 | switch (cmd) { | |
1446 | default: | |
1447 | return -ENOIOCTLCMD; | |
1448 | } | |
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | static | |
1453 | int lttng_event_notifier_group_release(struct inode *inode, struct file *file) | |
1454 | { | |
1455 | struct lttng_event_notifier_group *event_notifier_group = | |
1456 | file->private_data; | |
1457 | ||
1458 | if (event_notifier_group) | |
1459 | lttng_event_notifier_group_destroy(event_notifier_group); | |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | static const struct file_operations lttng_event_notifier_group_fops = { | |
1464 | .owner = THIS_MODULE, | |
1465 | .release = lttng_event_notifier_group_release, | |
1466 | .unlocked_ioctl = lttng_event_notifier_group_ioctl, | |
1467 | #ifdef CONFIG_COMPAT | |
1468 | .compat_ioctl = lttng_event_notifier_group_ioctl, | |
1469 | #endif | |
1470 | }; | |
1471 | ||
ad1c05e1 MD |
1472 | /** |
1473 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1474 | * | |
c0e31d2e | 1475 | * @file: the file |
ad1c05e1 MD |
1476 | * @cmd: the command |
1477 | * @arg: command arg | |
1478 | * | |
1479 | * This ioctl implements lttng commands: | |
38d024ae | 1480 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1481 | * Returns an event stream file descriptor or failure. |
1482 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1483 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1484 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1485 | * LTTNG_KERNEL_CONTEXT |
1486 | * Prepend a context field to each event in the channel | |
e64957da MD |
1487 | * LTTNG_KERNEL_ENABLE |
1488 | * Enable recording for events in this channel (weak enable) | |
1489 | * LTTNG_KERNEL_DISABLE | |
1490 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1491 | * |
baf20995 MD |
1492 | * Channel and event file descriptors also hold a reference on the session. |
1493 | */ | |
ad1c05e1 | 1494 | static |
c0e31d2e | 1495 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1496 | { |
a90917c3 | 1497 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1498 | |
baf20995 | 1499 | switch (cmd) { |
6dccd6c1 | 1500 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1501 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1502 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1503 | case LTTNG_KERNEL_OLD_EVENT: |
1504 | { | |
1505 | struct lttng_kernel_event *uevent_param; | |
1506 | struct lttng_kernel_old_event *old_uevent_param; | |
1507 | int ret; | |
1508 | ||
1509 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1510 | GFP_KERNEL); | |
1511 | if (!uevent_param) { | |
1512 | ret = -ENOMEM; | |
1513 | goto old_event_end; | |
1514 | } | |
1515 | old_uevent_param = kmalloc( | |
1516 | sizeof(struct lttng_kernel_old_event), | |
1517 | GFP_KERNEL); | |
1518 | if (!old_uevent_param) { | |
1519 | ret = -ENOMEM; | |
1520 | goto old_event_error_free_param; | |
1521 | } | |
1522 | if (copy_from_user(old_uevent_param, | |
1523 | (struct lttng_kernel_old_event __user *) arg, | |
1524 | sizeof(struct lttng_kernel_old_event))) { | |
1525 | ret = -EFAULT; | |
1526 | goto old_event_error_free_old_param; | |
1527 | } | |
1528 | ||
1529 | memcpy(uevent_param->name, old_uevent_param->name, | |
1530 | sizeof(uevent_param->name)); | |
1531 | uevent_param->instrumentation = | |
1532 | old_uevent_param->instrumentation; | |
1533 | ||
1534 | switch (old_uevent_param->instrumentation) { | |
1535 | case LTTNG_KERNEL_KPROBE: | |
1536 | uevent_param->u.kprobe.addr = | |
1537 | old_uevent_param->u.kprobe.addr; | |
1538 | uevent_param->u.kprobe.offset = | |
1539 | old_uevent_param->u.kprobe.offset; | |
1540 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1541 | old_uevent_param->u.kprobe.symbol_name, | |
1542 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1543 | break; | |
1544 | case LTTNG_KERNEL_KRETPROBE: | |
1545 | uevent_param->u.kretprobe.addr = | |
1546 | old_uevent_param->u.kretprobe.addr; | |
1547 | uevent_param->u.kretprobe.offset = | |
1548 | old_uevent_param->u.kretprobe.offset; | |
1549 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1550 | old_uevent_param->u.kretprobe.symbol_name, | |
1551 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1552 | break; | |
1553 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
1554 | WARN_ON_ONCE(1); |
1555 | /* Not implemented. */ | |
6dccd6c1 JD |
1556 | break; |
1557 | default: | |
1558 | break; | |
1559 | } | |
1560 | ret = lttng_abi_create_event(file, uevent_param); | |
1561 | ||
1562 | old_event_error_free_old_param: | |
1563 | kfree(old_uevent_param); | |
1564 | old_event_error_free_param: | |
1565 | kfree(uevent_param); | |
1566 | old_event_end: | |
1567 | return ret; | |
1568 | } | |
38d024ae | 1569 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1570 | { |
1571 | struct lttng_kernel_event uevent_param; | |
1572 | ||
1573 | if (copy_from_user(&uevent_param, | |
1574 | (struct lttng_kernel_event __user *) arg, | |
1575 | sizeof(uevent_param))) | |
1576 | return -EFAULT; | |
1577 | return lttng_abi_create_event(file, &uevent_param); | |
1578 | } | |
1579 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1580 | { | |
1581 | struct lttng_kernel_context *ucontext_param; | |
1582 | struct lttng_kernel_old_context *old_ucontext_param; | |
1583 | int ret; | |
1584 | ||
1585 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1586 | GFP_KERNEL); | |
1587 | if (!ucontext_param) { | |
1588 | ret = -ENOMEM; | |
1589 | goto old_ctx_end; | |
1590 | } | |
1591 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1592 | GFP_KERNEL); | |
1593 | if (!old_ucontext_param) { | |
1594 | ret = -ENOMEM; | |
1595 | goto old_ctx_error_free_param; | |
1596 | } | |
1597 | ||
1598 | if (copy_from_user(old_ucontext_param, | |
1599 | (struct lttng_kernel_old_context __user *) arg, | |
1600 | sizeof(struct lttng_kernel_old_context))) { | |
1601 | ret = -EFAULT; | |
1602 | goto old_ctx_error_free_old_param; | |
1603 | } | |
1604 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1605 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1606 | sizeof(ucontext_param->padding)); | |
1607 | /* only type that uses the union */ | |
1608 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1609 | ucontext_param->u.perf_counter.type = | |
1610 | old_ucontext_param->u.perf_counter.type; | |
1611 | ucontext_param->u.perf_counter.config = | |
1612 | old_ucontext_param->u.perf_counter.config; | |
1613 | memcpy(ucontext_param->u.perf_counter.name, | |
1614 | old_ucontext_param->u.perf_counter.name, | |
1615 | sizeof(ucontext_param->u.perf_counter.name)); | |
1616 | } | |
1617 | ||
1618 | ret = lttng_abi_add_context(file, | |
1619 | ucontext_param, | |
1620 | &channel->ctx, channel->session); | |
1621 | ||
1622 | old_ctx_error_free_old_param: | |
1623 | kfree(old_ucontext_param); | |
1624 | old_ctx_error_free_param: | |
1625 | kfree(ucontext_param); | |
1626 | old_ctx_end: | |
1627 | return ret; | |
1628 | } | |
8070f5c0 | 1629 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1630 | { |
1631 | struct lttng_kernel_context ucontext_param; | |
1632 | ||
1633 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1634 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1635 | sizeof(ucontext_param))) |
1636 | return -EFAULT; | |
1637 | return lttng_abi_add_context(file, | |
1638 | &ucontext_param, | |
8070f5c0 | 1639 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1640 | } |
1641 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1642 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1643 | return lttng_channel_enable(channel); |
6dccd6c1 | 1644 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1645 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1646 | return lttng_channel_disable(channel); |
12e579db MD |
1647 | case LTTNG_KERNEL_SYSCALL_MASK: |
1648 | return lttng_channel_syscall_mask(channel, | |
1649 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1650 | default: |
1651 | return -ENOIOCTLCMD; | |
1652 | } | |
1653 | } | |
1654 | ||
5dbbdb43 MD |
1655 | /** |
1656 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1657 | * | |
1658 | * @file: the file | |
1659 | * @cmd: the command | |
1660 | * @arg: command arg | |
1661 | * | |
1662 | * This ioctl implements lttng commands: | |
38d024ae | 1663 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1664 | * Returns an event stream file descriptor or failure. |
1665 | * | |
1666 | * Channel and event file descriptors also hold a reference on the session. | |
1667 | */ | |
1668 | static | |
1669 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1670 | { | |
1671 | switch (cmd) { | |
6dccd6c1 | 1672 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1673 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1674 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1675 | default: |
1676 | return -ENOIOCTLCMD; | |
1677 | } | |
1678 | } | |
1679 | ||
653fe716 MD |
1680 | /** |
1681 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1682 | * | |
c0e31d2e | 1683 | * @file: the file |
653fe716 MD |
1684 | * @wait: poll table |
1685 | */ | |
c0e31d2e | 1686 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1687 | { |
a90917c3 | 1688 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1689 | unsigned int mask = 0; |
1690 | ||
c0e31d2e | 1691 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1692 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1693 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1694 | wait); | |
653fe716 | 1695 | |
254ec7bc MD |
1696 | if (channel->ops->is_disabled(channel->chan)) |
1697 | return POLLERR; | |
24cedcfe | 1698 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1699 | return POLLHUP; |
f71ecafa | 1700 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1701 | return POLLIN | POLLRDNORM; |
f71ecafa | 1702 | return 0; |
653fe716 MD |
1703 | } |
1704 | return mask; | |
1705 | ||
1706 | } | |
1707 | ||
0a84a57f MD |
1708 | static |
1709 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1710 | { | |
a90917c3 | 1711 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1712 | |
1713 | if (channel) | |
1714 | fput(channel->session->file); | |
0a84a57f MD |
1715 | return 0; |
1716 | } | |
1717 | ||
d83004aa JD |
1718 | static |
1719 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1720 | { | |
1721 | struct lttng_channel *channel = file->private_data; | |
1722 | ||
1723 | if (channel) { | |
d83004aa | 1724 | fput(channel->session->file); |
a3381417 | 1725 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1726 | } |
1727 | ||
1728 | return 0; | |
1729 | } | |
1730 | ||
ad1c05e1 | 1731 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1732 | .owner = THIS_MODULE, |
03037b98 | 1733 | .release = lttng_channel_release, |
653fe716 | 1734 | .poll = lttng_channel_poll, |
ad1c05e1 | 1735 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1736 | #ifdef CONFIG_COMPAT |
03037b98 | 1737 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1738 | #endif |
11b5a3c2 | 1739 | }; |
baf20995 | 1740 | |
5dbbdb43 | 1741 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1742 | .owner = THIS_MODULE, |
d83004aa | 1743 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1744 | .unlocked_ioctl = lttng_metadata_ioctl, |
1745 | #ifdef CONFIG_COMPAT | |
1746 | .compat_ioctl = lttng_metadata_ioctl, | |
1747 | #endif | |
1748 | }; | |
1749 | ||
8070f5c0 MD |
1750 | /** |
1751 | * lttng_event_ioctl - lttng syscall through ioctl | |
1752 | * | |
1753 | * @file: the file | |
1754 | * @cmd: the command | |
1755 | * @arg: command arg | |
1756 | * | |
1757 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1758 | * LTTNG_KERNEL_CONTEXT |
1759 | * Prepend a context field to each record of this event | |
e64957da MD |
1760 | * LTTNG_KERNEL_ENABLE |
1761 | * Enable recording for this event (weak enable) | |
1762 | * LTTNG_KERNEL_DISABLE | |
1763 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1764 | */ |
1765 | static | |
1766 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1767 | { | |
3c997079 | 1768 | struct lttng_event *event; |
b2bc0bc8 | 1769 | struct lttng_event_enabler *event_enabler; |
3c997079 | 1770 | enum lttng_event_type *evtype = file->private_data; |
8070f5c0 MD |
1771 | |
1772 | switch (cmd) { | |
6dccd6c1 JD |
1773 | case LTTNG_KERNEL_OLD_CONTEXT: |
1774 | { | |
3c997079 MD |
1775 | /* Not implemented */ |
1776 | return -ENOSYS; | |
6dccd6c1 | 1777 | } |
8070f5c0 | 1778 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1779 | { |
3c997079 MD |
1780 | /* Not implemented */ |
1781 | return -ENOSYS; | |
6dccd6c1 JD |
1782 | } |
1783 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1784 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1785 | switch (*evtype) { |
1786 | case LTTNG_TYPE_EVENT: | |
1787 | event = file->private_data; | |
1788 | return lttng_event_enable(event); | |
1789 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
1790 | event_enabler = file->private_data; |
1791 | return lttng_event_enabler_enable(event_enabler); | |
3c997079 MD |
1792 | default: |
1793 | WARN_ON_ONCE(1); | |
1794 | return -ENOSYS; | |
1795 | } | |
6dccd6c1 | 1796 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1797 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1798 | switch (*evtype) { |
1799 | case LTTNG_TYPE_EVENT: | |
1800 | event = file->private_data; | |
1801 | return lttng_event_disable(event); | |
1802 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
1803 | event_enabler = file->private_data; |
1804 | return lttng_event_enabler_disable(event_enabler); | |
3c997079 MD |
1805 | default: |
1806 | WARN_ON_ONCE(1); | |
1807 | return -ENOSYS; | |
1808 | } | |
07dfc1d0 MD |
1809 | case LTTNG_KERNEL_FILTER: |
1810 | switch (*evtype) { | |
1811 | case LTTNG_TYPE_EVENT: | |
1812 | return -EINVAL; | |
1813 | case LTTNG_TYPE_ENABLER: | |
1814 | { | |
b2bc0bc8 FD |
1815 | event_enabler = file->private_data; |
1816 | return lttng_event_enabler_attach_bytecode(event_enabler, | |
07dfc1d0 MD |
1817 | (struct lttng_kernel_filter_bytecode __user *) arg); |
1818 | } | |
0586316f MD |
1819 | default: |
1820 | WARN_ON_ONCE(1); | |
1821 | return -ENOSYS; | |
07dfc1d0 | 1822 | } |
3aed4dca FD |
1823 | case LTTNG_KERNEL_ADD_CALLSITE: |
1824 | switch (*evtype) { | |
1825 | case LTTNG_TYPE_EVENT: | |
1826 | event = file->private_data; | |
1827 | return lttng_event_add_callsite(event, | |
1828 | (struct lttng_kernel_event_callsite __user *) arg); | |
1829 | case LTTNG_TYPE_ENABLER: | |
1830 | return -EINVAL; | |
64c147c0 MD |
1831 | default: |
1832 | WARN_ON_ONCE(1); | |
1833 | return -ENOSYS; | |
3aed4dca | 1834 | } |
8070f5c0 MD |
1835 | default: |
1836 | return -ENOIOCTLCMD; | |
1837 | } | |
1838 | } | |
1839 | ||
0a84a57f MD |
1840 | static |
1841 | int lttng_event_release(struct inode *inode, struct file *file) | |
1842 | { | |
3c997079 | 1843 | struct lttng_event *event; |
b2bc0bc8 | 1844 | struct lttng_event_enabler *event_enabler; |
3c997079 MD |
1845 | enum lttng_event_type *evtype = file->private_data; |
1846 | ||
1847 | if (!evtype) | |
1848 | return 0; | |
1849 | ||
1850 | switch (*evtype) { | |
1851 | case LTTNG_TYPE_EVENT: | |
1852 | event = file->private_data; | |
1853 | if (event) | |
1854 | fput(event->chan->file); | |
1855 | break; | |
1856 | case LTTNG_TYPE_ENABLER: | |
b2bc0bc8 FD |
1857 | event_enabler = file->private_data; |
1858 | if (event_enabler) | |
1859 | fput(event_enabler->chan->file); | |
3c997079 MD |
1860 | break; |
1861 | default: | |
1862 | WARN_ON_ONCE(1); | |
1863 | break; | |
1864 | } | |
c269fff4 | 1865 | |
0a84a57f MD |
1866 | return 0; |
1867 | } | |
1868 | ||
3b923e5b | 1869 | /* TODO: filter control ioctl */ |
0a84a57f | 1870 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1871 | .owner = THIS_MODULE, |
0a84a57f | 1872 | .release = lttng_event_release, |
8070f5c0 MD |
1873 | .unlocked_ioctl = lttng_event_ioctl, |
1874 | #ifdef CONFIG_COMPAT | |
1875 | .compat_ioctl = lttng_event_ioctl, | |
1876 | #endif | |
11b5a3c2 | 1877 | }; |
0a84a57f | 1878 | |
3b731ab1 JD |
1879 | static int put_u64(uint64_t val, unsigned long arg) |
1880 | { | |
1881 | return put_user(val, (uint64_t __user *) arg); | |
1882 | } | |
1883 | ||
8b97fd42 MD |
1884 | static int put_u32(uint32_t val, unsigned long arg) |
1885 | { | |
1886 | return put_user(val, (uint32_t __user *) arg); | |
1887 | } | |
1888 | ||
ed8d02d6 JD |
1889 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1890 | unsigned int cmd, unsigned long arg) | |
1891 | { | |
3b731ab1 JD |
1892 | struct lib_ring_buffer *buf = filp->private_data; |
1893 | struct channel *chan = buf->backend.chan; | |
1894 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1895 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1896 | int ret; |
1897 | ||
1898 | if (atomic_read(&chan->record_disabled)) | |
1899 | return -EIO; | |
1900 | ||
ed8d02d6 | 1901 | switch (cmd) { |
3b731ab1 JD |
1902 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1903 | { | |
1904 | uint64_t ts; | |
1905 | ||
dd5a0db3 | 1906 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1907 | if (ret < 0) |
1908 | goto error; | |
1909 | return put_u64(ts, arg); | |
1910 | } | |
1911 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1912 | { | |
1913 | uint64_t ts; | |
1914 | ||
dd5a0db3 | 1915 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1916 | if (ret < 0) |
1917 | goto error; | |
1918 | return put_u64(ts, arg); | |
1919 | } | |
1920 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1921 | { | |
1922 | uint64_t ed; | |
1923 | ||
dd5a0db3 | 1924 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1925 | if (ret < 0) |
1926 | goto error; | |
1927 | return put_u64(ed, arg); | |
1928 | } | |
1929 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1930 | { | |
1931 | uint64_t cs; | |
1932 | ||
dd5a0db3 | 1933 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1934 | if (ret < 0) |
1935 | goto error; | |
1936 | return put_u64(cs, arg); | |
1937 | } | |
1938 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1939 | { | |
1940 | uint64_t ps; | |
1941 | ||
dd5a0db3 | 1942 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1943 | if (ret < 0) |
1944 | goto error; | |
1945 | return put_u64(ps, arg); | |
1946 | } | |
1947 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1948 | { | |
1949 | uint64_t si; | |
1950 | ||
dd5a0db3 | 1951 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1952 | if (ret < 0) |
1953 | goto error; | |
1954 | return put_u64(si, arg); | |
1955 | } | |
2348ca17 JD |
1956 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1957 | { | |
1958 | uint64_t ts; | |
1959 | ||
dd5a0db3 | 1960 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1961 | if (ret < 0) |
1962 | goto error; | |
1963 | return put_u64(ts, arg); | |
1964 | } | |
5b3cf4f9 JD |
1965 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1966 | { | |
1967 | uint64_t seq; | |
1968 | ||
1969 | ret = ops->sequence_number(config, buf, &seq); | |
1970 | if (ret < 0) | |
1971 | goto error; | |
1972 | return put_u64(seq, arg); | |
1973 | } | |
5594698f JD |
1974 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1975 | { | |
1976 | uint64_t id; | |
1977 | ||
1978 | ret = ops->instance_id(config, buf, &id); | |
1979 | if (ret < 0) | |
1980 | goto error; | |
1981 | return put_u64(id, arg); | |
1982 | } | |
3b731ab1 JD |
1983 | default: |
1984 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1985 | cmd, arg); | |
ed8d02d6 | 1986 | } |
3b731ab1 JD |
1987 | |
1988 | error: | |
1989 | return -ENOSYS; | |
ed8d02d6 JD |
1990 | } |
1991 | ||
1992 | #ifdef CONFIG_COMPAT | |
1993 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1994 | unsigned int cmd, unsigned long arg) | |
1995 | { | |
3b731ab1 JD |
1996 | struct lib_ring_buffer *buf = filp->private_data; |
1997 | struct channel *chan = buf->backend.chan; | |
1998 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1999 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
2000 | int ret; |
2001 | ||
2002 | if (atomic_read(&chan->record_disabled)) | |
2003 | return -EIO; | |
2004 | ||
ed8d02d6 | 2005 | switch (cmd) { |
3b731ab1 JD |
2006 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
2007 | { | |
2008 | uint64_t ts; | |
2009 | ||
dd5a0db3 | 2010 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
2011 | if (ret < 0) |
2012 | goto error; | |
2013 | return put_u64(ts, arg); | |
2014 | } | |
2015 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
2016 | { | |
2017 | uint64_t ts; | |
2018 | ||
dd5a0db3 | 2019 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
2020 | if (ret < 0) |
2021 | goto error; | |
2022 | return put_u64(ts, arg); | |
2023 | } | |
2024 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
2025 | { | |
2026 | uint64_t ed; | |
2027 | ||
dd5a0db3 | 2028 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
2029 | if (ret < 0) |
2030 | goto error; | |
2031 | return put_u64(ed, arg); | |
ed8d02d6 | 2032 | } |
3b731ab1 JD |
2033 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
2034 | { | |
2035 | uint64_t cs; | |
2036 | ||
dd5a0db3 | 2037 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
2038 | if (ret < 0) |
2039 | goto error; | |
2040 | return put_u64(cs, arg); | |
2041 | } | |
2042 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
2043 | { | |
2044 | uint64_t ps; | |
2045 | ||
dd5a0db3 | 2046 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
2047 | if (ret < 0) |
2048 | goto error; | |
2049 | return put_u64(ps, arg); | |
2050 | } | |
2051 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
2052 | { | |
2053 | uint64_t si; | |
2054 | ||
dd5a0db3 | 2055 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
2056 | if (ret < 0) |
2057 | goto error; | |
2058 | return put_u64(si, arg); | |
2059 | } | |
2348ca17 JD |
2060 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
2061 | { | |
2062 | uint64_t ts; | |
2063 | ||
dd5a0db3 | 2064 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
2065 | if (ret < 0) |
2066 | goto error; | |
2067 | return put_u64(ts, arg); | |
2068 | } | |
5b3cf4f9 JD |
2069 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2070 | { | |
2071 | uint64_t seq; | |
2072 | ||
2073 | ret = ops->sequence_number(config, buf, &seq); | |
2074 | if (ret < 0) | |
2075 | goto error; | |
2076 | return put_u64(seq, arg); | |
2077 | } | |
5594698f JD |
2078 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2079 | { | |
2080 | uint64_t id; | |
2081 | ||
2082 | ret = ops->instance_id(config, buf, &id); | |
2083 | if (ret < 0) | |
2084 | goto error; | |
2085 | return put_u64(id, arg); | |
2086 | } | |
3b731ab1 JD |
2087 | default: |
2088 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2089 | cmd, arg); | |
2090 | } | |
2091 | ||
2092 | error: | |
2093 | return -ENOSYS; | |
ed8d02d6 JD |
2094 | } |
2095 | #endif /* CONFIG_COMPAT */ | |
2096 | ||
2097 | static void lttng_stream_override_ring_buffer_fops(void) | |
2098 | { | |
2099 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2100 | lttng_stream_ring_buffer_file_operations.open = | |
2101 | lib_ring_buffer_file_operations.open; | |
2102 | lttng_stream_ring_buffer_file_operations.release = | |
2103 | lib_ring_buffer_file_operations.release; | |
2104 | lttng_stream_ring_buffer_file_operations.poll = | |
2105 | lib_ring_buffer_file_operations.poll; | |
2106 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2107 | lib_ring_buffer_file_operations.splice_read; | |
2108 | lttng_stream_ring_buffer_file_operations.mmap = | |
2109 | lib_ring_buffer_file_operations.mmap; | |
2110 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2111 | lttng_stream_ring_buffer_ioctl; | |
2112 | lttng_stream_ring_buffer_file_operations.llseek = | |
2113 | lib_ring_buffer_file_operations.llseek; | |
2114 | #ifdef CONFIG_COMPAT | |
2115 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2116 | lttng_stream_ring_buffer_compat_ioctl; | |
2117 | #endif | |
2118 | } | |
2119 | ||
80996790 | 2120 | int __init lttng_abi_init(void) |
baf20995 MD |
2121 | { |
2122 | int ret = 0; | |
2123 | ||
263b6c88 | 2124 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2125 | lttng_clock_ref(); |
f771eda6 JD |
2126 | |
2127 | ret = lttng_tp_mempool_init(); | |
2128 | if (ret) { | |
2129 | goto error; | |
2130 | } | |
2131 | ||
d29348f7 | 2132 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 2133 | <tng_proc_ops, NULL); |
2470a237 | 2134 | |
255e52a4 | 2135 | if (!lttng_proc_dentry) { |
5a15f70c | 2136 | printk(KERN_ERR "LTTng: Error creating control file\n"); |
baf20995 MD |
2137 | ret = -ENOMEM; |
2138 | goto error; | |
2139 | } | |
ed8d02d6 | 2140 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2141 | return 0; |
ed8d02d6 | 2142 | |
baf20995 | 2143 | error: |
f771eda6 | 2144 | lttng_tp_mempool_destroy(); |
2754583e | 2145 | lttng_clock_unref(); |
baf20995 MD |
2146 | return ret; |
2147 | } | |
2148 | ||
e6e65fcd MD |
2149 | /* No __exit annotation because used by init error path too. */ |
2150 | void lttng_abi_exit(void) | |
baf20995 | 2151 | { |
f771eda6 | 2152 | lttng_tp_mempool_destroy(); |
2754583e | 2153 | lttng_clock_unref(); |
e6a17f26 MD |
2154 | if (lttng_proc_dentry) |
2155 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2156 | } |