Commit | Line | Data |
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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> |
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; |
ad1c05e1 MD |
54 | static const struct file_operations lttng_fops; |
55 | static const struct file_operations lttng_session_fops; | |
56 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 57 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 58 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 59 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 60 | |
9616f0bf JD |
61 | static int put_u64(uint64_t val, unsigned long arg); |
62 | ||
a33c9927 MD |
63 | /* |
64 | * Teardown management: opened file descriptors keep a refcount on the module, | |
65 | * so it can only exit when all file descriptors are closed. | |
66 | */ | |
67 | ||
ad1c05e1 | 68 | static |
baf20995 MD |
69 | int lttng_abi_create_session(void) |
70 | { | |
a90917c3 | 71 | struct lttng_session *session; |
c0e31d2e | 72 | struct file *session_file; |
11b5a3c2 | 73 | int session_fd, ret; |
baf20995 | 74 | |
a90917c3 | 75 | session = lttng_session_create(); |
baf20995 MD |
76 | if (!session) |
77 | return -ENOMEM; | |
4ac10b76 | 78 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
79 | if (session_fd < 0) { |
80 | ret = session_fd; | |
81 | goto fd_error; | |
82 | } | |
c0e31d2e | 83 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 84 | <tng_session_fops, |
baf20995 | 85 | session, O_RDWR); |
c0e31d2e MD |
86 | if (IS_ERR(session_file)) { |
87 | ret = PTR_ERR(session_file); | |
baf20995 MD |
88 | goto file_error; |
89 | } | |
c0e31d2e MD |
90 | session->file = session_file; |
91 | fd_install(session_fd, session_file); | |
baf20995 MD |
92 | return session_fd; |
93 | ||
94 | file_error: | |
95 | put_unused_fd(session_fd); | |
96 | fd_error: | |
a90917c3 | 97 | lttng_session_destroy(session); |
baf20995 MD |
98 | return ret; |
99 | } | |
100 | ||
271b6681 MD |
101 | static |
102 | int lttng_abi_tracepoint_list(void) | |
103 | { | |
104 | struct file *tracepoint_list_file; | |
105 | int file_fd, ret; | |
106 | ||
4ac10b76 | 107 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
108 | if (file_fd < 0) { |
109 | ret = file_fd; | |
110 | goto fd_error; | |
111 | } | |
30f18bf0 | 112 | |
8ee099b6 | 113 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
114 | <tng_tracepoint_list_fops, |
115 | NULL, O_RDWR); | |
116 | if (IS_ERR(tracepoint_list_file)) { | |
117 | ret = PTR_ERR(tracepoint_list_file); | |
118 | goto file_error; | |
119 | } | |
30f18bf0 MD |
120 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
121 | if (ret < 0) | |
122 | goto open_error; | |
271b6681 MD |
123 | fd_install(file_fd, tracepoint_list_file); |
124 | return file_fd; | |
125 | ||
30f18bf0 MD |
126 | open_error: |
127 | fput(tracepoint_list_file); | |
271b6681 MD |
128 | file_error: |
129 | put_unused_fd(file_fd); | |
130 | fd_error: | |
131 | return ret; | |
132 | } | |
133 | ||
f127e61e MD |
134 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
135 | static inline | |
136 | int lttng_abi_syscall_list(void) | |
137 | { | |
138 | return -ENOSYS; | |
139 | } | |
140 | #else | |
141 | static | |
142 | int lttng_abi_syscall_list(void) | |
143 | { | |
144 | struct file *syscall_list_file; | |
145 | int file_fd, ret; | |
146 | ||
147 | file_fd = lttng_get_unused_fd(); | |
148 | if (file_fd < 0) { | |
149 | ret = file_fd; | |
150 | goto fd_error; | |
151 | } | |
152 | ||
153 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
154 | <tng_syscall_list_fops, | |
155 | NULL, O_RDWR); | |
156 | if (IS_ERR(syscall_list_file)) { | |
157 | ret = PTR_ERR(syscall_list_file); | |
158 | goto file_error; | |
159 | } | |
160 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
161 | if (ret < 0) | |
162 | goto open_error; | |
163 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
164 | return file_fd; |
165 | ||
166 | open_error: | |
167 | fput(syscall_list_file); | |
168 | file_error: | |
169 | put_unused_fd(file_fd); | |
170 | fd_error: | |
171 | return ret; | |
172 | } | |
173 | #endif | |
174 | ||
80c16bcf | 175 | static |
6dccd6c1 | 176 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 177 | { |
6dccd6c1 JD |
178 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
179 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
180 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
181 | } |
182 | ||
42cabb80 MD |
183 | static |
184 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
185 | { | |
186 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
187 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
188 | } | |
189 | ||
8070f5c0 MD |
190 | static |
191 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 192 | struct lttng_kernel_context *context_param, |
a90917c3 | 193 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 194 | { |
8070f5c0 MD |
195 | |
196 | if (session->been_active) | |
197 | return -EPERM; | |
198 | ||
6dccd6c1 | 199 | switch (context_param->ctx) { |
12a313a5 | 200 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 201 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
202 | case LTTNG_KERNEL_CONTEXT_PRIO: |
203 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
204 | case LTTNG_KERNEL_CONTEXT_NICE: |
205 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
206 | case LTTNG_KERNEL_CONTEXT_VPID: |
207 | return lttng_add_vpid_to_ctx(ctx); | |
208 | case LTTNG_KERNEL_CONTEXT_TID: | |
209 | return lttng_add_tid_to_ctx(ctx); | |
210 | case LTTNG_KERNEL_CONTEXT_VTID: | |
211 | return lttng_add_vtid_to_ctx(ctx); | |
212 | case LTTNG_KERNEL_CONTEXT_PPID: | |
213 | return lttng_add_ppid_to_ctx(ctx); | |
214 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
215 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 216 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
217 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
218 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
219 | context_param->u.perf_counter.config, | |
220 | context_param->u.perf_counter.name, | |
c24a0d71 | 221 | ctx); |
a2563e83 MD |
222 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
223 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
224 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
225 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
226 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
227 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
228 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
229 | return lttng_add_interruptible_to_ctx(ctx); | |
230 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
231 | return lttng_add_need_reschedule_to_ctx(ctx); | |
232 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
233 | return lttng_add_preemptible_to_ctx(ctx); | |
234 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
235 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
236 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
237 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
238 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
c3315ccd MJ |
239 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
240 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
241 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
242 | return lttng_add_ipc_ns_to_ctx(ctx); | |
243 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
244 | return lttng_add_mnt_ns_to_ctx(ctx); | |
245 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
246 | return lttng_add_net_ns_to_ctx(ctx); | |
247 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
248 | return lttng_add_pid_ns_to_ctx(ctx); | |
249 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
250 | return lttng_add_user_ns_to_ctx(ctx); | |
251 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
252 | return lttng_add_uts_ns_to_ctx(ctx); | |
390adb99 MJ |
253 | case LTTNG_KERNEL_CONTEXT_UID: |
254 | return lttng_add_uid_to_ctx(ctx); | |
255 | case LTTNG_KERNEL_CONTEXT_EUID: | |
256 | return lttng_add_euid_to_ctx(ctx); | |
257 | case LTTNG_KERNEL_CONTEXT_SUID: | |
258 | return lttng_add_suid_to_ctx(ctx); | |
259 | case LTTNG_KERNEL_CONTEXT_GID: | |
260 | return lttng_add_gid_to_ctx(ctx); | |
261 | case LTTNG_KERNEL_CONTEXT_EGID: | |
262 | return lttng_add_egid_to_ctx(ctx); | |
263 | case LTTNG_KERNEL_CONTEXT_SGID: | |
264 | return lttng_add_sgid_to_ctx(ctx); | |
265 | case LTTNG_KERNEL_CONTEXT_VUID: | |
266 | return lttng_add_vuid_to_ctx(ctx); | |
267 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
268 | return lttng_add_veuid_to_ctx(ctx); | |
269 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
270 | return lttng_add_vsuid_to_ctx(ctx); | |
271 | case LTTNG_KERNEL_CONTEXT_VGID: | |
272 | return lttng_add_vgid_to_ctx(ctx); | |
273 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
274 | return lttng_add_vegid_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
276 | return lttng_add_vsgid_to_ctx(ctx); | |
8070f5c0 MD |
277 | default: |
278 | return -EINVAL; | |
279 | } | |
280 | } | |
281 | ||
ad1c05e1 MD |
282 | /** |
283 | * lttng_ioctl - lttng syscall through ioctl | |
284 | * | |
c0e31d2e | 285 | * @file: the file |
ad1c05e1 MD |
286 | * @cmd: the command |
287 | * @arg: command arg | |
288 | * | |
289 | * This ioctl implements lttng commands: | |
38d024ae | 290 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 291 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
292 | * LTTNG_KERNEL_TRACER_VERSION |
293 | * Returns the LTTng kernel tracer version | |
294 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
295 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
296 | * LTTNG_KERNEL_WAIT_QUIESCENT |
297 | * Returns after all previously running probes have completed | |
42cabb80 MD |
298 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
299 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
300 | * |
301 | * The returned session will be deleted when its file descriptor is closed. | |
302 | */ | |
303 | static | |
c0e31d2e | 304 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
305 | { |
306 | switch (cmd) { | |
6dccd6c1 | 307 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 308 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 309 | return lttng_abi_create_session(); |
6dccd6c1 JD |
310 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
311 | { | |
312 | struct lttng_kernel_tracer_version v; | |
313 | struct lttng_kernel_old_tracer_version oldv; | |
314 | struct lttng_kernel_old_tracer_version *uversion = | |
315 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
316 | ||
317 | lttng_abi_tracer_version(&v); | |
318 | oldv.major = v.major; | |
319 | oldv.minor = v.minor; | |
320 | oldv.patchlevel = v.patchlevel; | |
321 | ||
322 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
323 | return -EFAULT; | |
324 | return 0; | |
325 | } | |
80c16bcf | 326 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
327 | { |
328 | struct lttng_kernel_tracer_version version; | |
329 | struct lttng_kernel_tracer_version *uversion = | |
330 | (struct lttng_kernel_tracer_version __user *) arg; | |
331 | ||
332 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
333 | |
334 | if (copy_to_user(uversion, &version, sizeof(version))) | |
335 | return -EFAULT; | |
336 | return 0; | |
337 | } | |
338 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
339 | { | |
340 | struct lttng_kernel_tracer_abi_version version; | |
341 | struct lttng_kernel_tracer_abi_version *uversion = | |
342 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
343 | ||
344 | lttng_abi_tracer_abi_version(&version); | |
345 | ||
6dccd6c1 JD |
346 | if (copy_to_user(uversion, &version, sizeof(version))) |
347 | return -EFAULT; | |
348 | return 0; | |
349 | } | |
350 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
351 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
352 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
353 | case LTTNG_KERNEL_SYSCALL_LIST: |
354 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 355 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
356 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
357 | synchronize_trace(); | |
358 | return 0; | |
6dccd6c1 JD |
359 | case LTTNG_KERNEL_OLD_CALIBRATE: |
360 | { | |
361 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
362 | (struct lttng_kernel_old_calibrate __user *) arg; | |
363 | struct lttng_kernel_old_calibrate old_calibrate; | |
364 | struct lttng_kernel_calibrate calibrate; | |
365 | int ret; | |
366 | ||
367 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
368 | return -EFAULT; | |
369 | calibrate.type = old_calibrate.type; | |
370 | ret = lttng_calibrate(&calibrate); | |
371 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
372 | return -EFAULT; | |
373 | return ret; | |
374 | } | |
57105fc2 MD |
375 | case LTTNG_KERNEL_CALIBRATE: |
376 | { | |
3db41b2c MD |
377 | struct lttng_kernel_calibrate __user *ucalibrate = |
378 | (struct lttng_kernel_calibrate __user *) arg; | |
379 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
380 | int ret; |
381 | ||
382 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
383 | return -EFAULT; | |
384 | ret = lttng_calibrate(&calibrate); | |
385 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
386 | return -EFAULT; | |
387 | return ret; | |
388 | } | |
ad1c05e1 MD |
389 | default: |
390 | return -ENOIOCTLCMD; | |
391 | } | |
392 | } | |
393 | ||
ad1c05e1 | 394 | static const struct file_operations lttng_fops = { |
a33c9927 | 395 | .owner = THIS_MODULE, |
ad1c05e1 MD |
396 | .unlocked_ioctl = lttng_ioctl, |
397 | #ifdef CONFIG_COMPAT | |
03037b98 | 398 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 399 | #endif |
11b5a3c2 | 400 | }; |
ad1c05e1 | 401 | |
5dbbdb43 | 402 | static |
c0e31d2e | 403 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 404 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 405 | enum channel_type channel_type) |
baf20995 | 406 | { |
a90917c3 | 407 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 408 | const struct file_operations *fops = NULL; |
5dbbdb43 | 409 | const char *transport_name; |
a90917c3 | 410 | struct lttng_channel *chan; |
c0e31d2e | 411 | struct file *chan_file; |
baf20995 | 412 | int chan_fd; |
ad1c05e1 | 413 | int ret = 0; |
baf20995 | 414 | |
4ac10b76 | 415 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
416 | if (chan_fd < 0) { |
417 | ret = chan_fd; | |
418 | goto fd_error; | |
419 | } | |
88dfd899 MD |
420 | switch (channel_type) { |
421 | case PER_CPU_CHANNEL: | |
422 | fops = <tng_channel_fops; | |
423 | break; | |
424 | case METADATA_CHANNEL: | |
425 | fops = <tng_metadata_fops; | |
426 | break; | |
427 | } | |
2470a237 | 428 | |
c0e31d2e | 429 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 430 | fops, |
03037b98 | 431 | NULL, O_RDWR); |
c0e31d2e MD |
432 | if (IS_ERR(chan_file)) { |
433 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
434 | goto file_error; |
435 | } | |
5dbbdb43 MD |
436 | switch (channel_type) { |
437 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
438 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
439 | transport_name = chan_param->overwrite ? | |
96ba7208 | 440 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
441 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
442 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
443 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
444 | } else { | |
445 | return -EINVAL; | |
446 | } | |
5dbbdb43 | 447 | break; |
5dbbdb43 | 448 | case METADATA_CHANNEL: |
6dccd6c1 | 449 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 450 | transport_name = "relay-metadata"; |
6dccd6c1 | 451 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
452 | transport_name = "relay-metadata-mmap"; |
453 | else | |
454 | return -EINVAL; | |
5dbbdb43 MD |
455 | break; |
456 | default: | |
457 | transport_name = "<unknown>"; | |
458 | break; | |
459 | } | |
98d7281c MJ |
460 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
461 | ret = -EOVERFLOW; | |
9c1f4643 MD |
462 | goto refcount_error; |
463 | } | |
03037b98 MD |
464 | /* |
465 | * We tolerate no failure path after channel creation. It will stay | |
466 | * invariant for the rest of the session. | |
467 | */ | |
a90917c3 | 468 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
469 | chan_param->subbuf_size, |
470 | chan_param->num_subbuf, | |
471 | chan_param->switch_timer_interval, | |
d83004aa JD |
472 | chan_param->read_timer_interval, |
473 | channel_type); | |
03037b98 | 474 | if (!chan) { |
f3d01b96 | 475 | ret = -EINVAL; |
03037b98 MD |
476 | goto chan_error; |
477 | } | |
11b5a3c2 | 478 | chan->file = chan_file; |
c0e31d2e MD |
479 | chan_file->private_data = chan; |
480 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 481 | |
baf20995 MD |
482 | return chan_fd; |
483 | ||
03037b98 | 484 | chan_error: |
9c1f4643 MD |
485 | atomic_long_dec(&session_file->f_count); |
486 | refcount_error: | |
c0e31d2e | 487 | fput(chan_file); |
baf20995 MD |
488 | file_error: |
489 | put_unused_fd(chan_fd); | |
490 | fd_error: | |
baf20995 MD |
491 | return ret; |
492 | } | |
493 | ||
ed731990 JR |
494 | static |
495 | int lttng_abi_session_set_name(struct lttng_session *session, | |
496 | struct lttng_kernel_session_name *name) | |
497 | { | |
498 | size_t len; | |
499 | ||
500 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
501 | ||
502 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
503 | /* Name is too long/malformed */ | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
507 | strcpy(session->name, name->name); | |
508 | return 0; | |
509 | } | |
510 | ||
5cc652a6 JR |
511 | static |
512 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
513 | struct lttng_kernel_session_creation_time *time) | |
514 | { | |
515 | size_t len; | |
516 | ||
517 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
518 | ||
519 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
520 | /* Time is too long/malformed */ | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | strcpy(session->creation_time, time->iso8601); | |
525 | return 0; | |
526 | } | |
527 | ||
baf20995 | 528 | /** |
ad1c05e1 | 529 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 530 | * |
c0e31d2e | 531 | * @file: the file |
baf20995 MD |
532 | * @cmd: the command |
533 | * @arg: command arg | |
534 | * | |
535 | * This ioctl implements lttng commands: | |
38d024ae | 536 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 537 | * Returns a LTTng channel file descriptor |
e64957da MD |
538 | * LTTNG_KERNEL_ENABLE |
539 | * Enables tracing for a session (weak enable) | |
540 | * LTTNG_KERNEL_DISABLE | |
541 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
542 | * LTTNG_KERNEL_METADATA |
543 | * Returns a LTTng metadata file descriptor | |
e0130fab MD |
544 | * LTTNG_KERNEL_SESSION_TRACK_PID |
545 | * Add PID to session tracker | |
546 | * LTTNG_KERNEL_SESSION_UNTRACK_PID | |
547 | * Remove PID from session tracker | |
ad1c05e1 MD |
548 | * |
549 | * The returned channel will be deleted when its file descriptor is closed. | |
550 | */ | |
551 | static | |
c0e31d2e | 552 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 553 | { |
a90917c3 | 554 | struct lttng_session *session = file->private_data; |
c0e31d2e | 555 | |
ad1c05e1 | 556 | switch (cmd) { |
6dccd6c1 JD |
557 | case LTTNG_KERNEL_OLD_CHANNEL: |
558 | { | |
559 | struct lttng_kernel_channel chan_param; | |
560 | struct lttng_kernel_old_channel old_chan_param; | |
561 | ||
562 | if (copy_from_user(&old_chan_param, | |
563 | (struct lttng_kernel_old_channel __user *) arg, | |
564 | sizeof(struct lttng_kernel_old_channel))) | |
565 | return -EFAULT; | |
566 | chan_param.overwrite = old_chan_param.overwrite; | |
567 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
568 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
569 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
570 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
571 | chan_param.output = old_chan_param.output; | |
572 | ||
573 | return lttng_abi_create_channel(file, &chan_param, | |
574 | PER_CPU_CHANNEL); | |
575 | } | |
38d024ae | 576 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
577 | { |
578 | struct lttng_kernel_channel chan_param; | |
579 | ||
580 | if (copy_from_user(&chan_param, | |
38d024ae | 581 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
582 | sizeof(struct lttng_kernel_channel))) |
583 | return -EFAULT; | |
584 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 585 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
586 | } |
587 | case LTTNG_KERNEL_OLD_SESSION_START: | |
588 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 589 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 590 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 591 | return lttng_session_enable(session); |
6dccd6c1 JD |
592 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
593 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 594 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 595 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 596 | return lttng_session_disable(session); |
6dccd6c1 JD |
597 | case LTTNG_KERNEL_OLD_METADATA: |
598 | { | |
599 | struct lttng_kernel_channel chan_param; | |
600 | struct lttng_kernel_old_channel old_chan_param; | |
601 | ||
602 | if (copy_from_user(&old_chan_param, | |
603 | (struct lttng_kernel_old_channel __user *) arg, | |
604 | sizeof(struct lttng_kernel_old_channel))) | |
605 | return -EFAULT; | |
606 | chan_param.overwrite = old_chan_param.overwrite; | |
607 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
608 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
609 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
610 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
611 | chan_param.output = old_chan_param.output; | |
612 | ||
613 | return lttng_abi_create_channel(file, &chan_param, | |
614 | METADATA_CHANNEL); | |
615 | } | |
38d024ae | 616 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
617 | { |
618 | struct lttng_kernel_channel chan_param; | |
619 | ||
620 | if (copy_from_user(&chan_param, | |
621 | (struct lttng_kernel_channel __user *) arg, | |
622 | sizeof(struct lttng_kernel_channel))) | |
623 | return -EFAULT; | |
624 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 625 | METADATA_CHANNEL); |
6dccd6c1 | 626 | } |
e0130fab MD |
627 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
628 | return lttng_session_track_pid(session, (int) arg); | |
629 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: | |
630 | return lttng_session_untrack_pid(session, (int) arg); | |
7e6f9ef6 MD |
631 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
632 | return lttng_session_list_tracker_pids(session); | |
9616f0bf JD |
633 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
634 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
635 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
636 | return lttng_session_statedump(session); | |
ed731990 JR |
637 | case LTTNG_KERNEL_SESSION_SET_NAME: |
638 | { | |
639 | struct lttng_kernel_session_name name; | |
640 | ||
641 | if (copy_from_user(&name, | |
642 | (struct lttng_kernel_session_name __user *) arg, | |
643 | sizeof(struct lttng_kernel_session_name))) | |
644 | return -EFAULT; | |
645 | return lttng_abi_session_set_name(session, &name); | |
646 | } | |
5cc652a6 JR |
647 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
648 | { | |
649 | struct lttng_kernel_session_creation_time time; | |
650 | ||
651 | if (copy_from_user(&time, | |
652 | (struct lttng_kernel_session_creation_time __user *) arg, | |
653 | sizeof(struct lttng_kernel_session_creation_time))) | |
654 | return -EFAULT; | |
655 | return lttng_abi_session_set_creation_time(session, &time); | |
656 | } | |
ad1c05e1 MD |
657 | default: |
658 | return -ENOIOCTLCMD; | |
659 | } | |
660 | } | |
661 | ||
03037b98 MD |
662 | /* |
663 | * Called when the last file reference is dropped. | |
664 | * | |
665 | * Big fat note: channels and events are invariant for the whole session after | |
666 | * their creation. So this session destruction also destroys all channel and | |
667 | * event structures specific to this session (they are not destroyed when their | |
668 | * individual file is released). | |
669 | */ | |
ad1c05e1 | 670 | static |
03037b98 | 671 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 672 | { |
a90917c3 | 673 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
674 | |
675 | if (session) | |
a90917c3 | 676 | lttng_session_destroy(session); |
11b5a3c2 | 677 | return 0; |
ad1c05e1 | 678 | } |
ad1c05e1 MD |
679 | |
680 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 681 | .owner = THIS_MODULE, |
03037b98 | 682 | .release = lttng_session_release, |
ad1c05e1 MD |
683 | .unlocked_ioctl = lttng_session_ioctl, |
684 | #ifdef CONFIG_COMPAT | |
03037b98 | 685 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 686 | #endif |
11b5a3c2 | 687 | }; |
ad1c05e1 | 688 | |
d83004aa JD |
689 | /** |
690 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
691 | * @filp: the file | |
692 | * @wait: poll table | |
693 | * | |
694 | * Handles the poll operations for the metadata channels. | |
695 | */ | |
ad1c05e1 | 696 | static |
d83004aa JD |
697 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
698 | poll_table *wait) | |
699 | { | |
700 | struct lttng_metadata_stream *stream = filp->private_data; | |
701 | struct lib_ring_buffer *buf = stream->priv; | |
702 | int finalized; | |
703 | unsigned int mask = 0; | |
704 | ||
705 | if (filp->f_mode & FMODE_READ) { | |
706 | poll_wait_set_exclusive(wait); | |
707 | poll_wait(filp, &stream->read_wait, wait); | |
708 | ||
709 | finalized = stream->finalized; | |
710 | ||
711 | /* | |
712 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
713 | * ordering finalized load before offsets loads. | |
714 | */ | |
715 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
716 | ||
717 | if (finalized) | |
718 | mask |= POLLHUP; | |
719 | ||
92d9f5e6 | 720 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 721 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 722 | stream->metadata_out) |
d83004aa | 723 | mask |= POLLIN; |
92d9f5e6 | 724 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
725 | } |
726 | ||
727 | return mask; | |
728 | } | |
729 | ||
f613e3e6 MD |
730 | static |
731 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
732 | unsigned int cmd, unsigned long arg) | |
733 | { | |
734 | struct lttng_metadata_stream *stream = filp->private_data; | |
735 | ||
736 | stream->metadata_out = stream->metadata_in; | |
737 | } | |
738 | ||
d1344afa JD |
739 | /* |
740 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
741 | * the consumer receives the content of the metadata cache unchanged. This is | |
742 | * different from the metadata_regenerate where the offset from epoch is | |
743 | * resampled, here we want the exact same content as the last time the metadata | |
744 | * was generated. This command is only possible if all the metadata written | |
745 | * in the cache has been output to the metadata stream to avoid corrupting the | |
746 | * metadata file. | |
747 | * | |
748 | * Return 0 on success, a negative value on error. | |
749 | */ | |
750 | static | |
751 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
752 | { | |
753 | int ret; | |
754 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
755 | ||
756 | mutex_lock(&cache->lock); | |
757 | if (stream->metadata_out != cache->metadata_written) { | |
758 | ret = -EBUSY; | |
759 | goto end; | |
760 | } | |
761 | stream->metadata_out = 0; | |
762 | stream->metadata_in = 0; | |
763 | wake_up_interruptible(&stream->read_wait); | |
764 | ret = 0; | |
765 | ||
766 | end: | |
767 | mutex_unlock(&cache->lock); | |
768 | return ret; | |
769 | } | |
770 | ||
d83004aa JD |
771 | static |
772 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
773 | unsigned int cmd, unsigned long arg) | |
774 | { | |
775 | int ret; | |
776 | struct lttng_metadata_stream *stream = filp->private_data; | |
777 | struct lib_ring_buffer *buf = stream->priv; | |
778 | ||
779 | switch (cmd) { | |
d83004aa JD |
780 | case RING_BUFFER_GET_NEXT_SUBBUF: |
781 | { | |
35097f36 JD |
782 | struct lttng_metadata_stream *stream = filp->private_data; |
783 | struct lib_ring_buffer *buf = stream->priv; | |
784 | struct channel *chan = buf->backend.chan; | |
785 | ||
786 | ret = lttng_metadata_output_channel(stream, chan); | |
787 | if (ret > 0) { | |
788 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
789 | ret = 0; | |
790 | } else if (ret < 0) | |
d83004aa JD |
791 | goto err; |
792 | break; | |
793 | } | |
f613e3e6 MD |
794 | case RING_BUFFER_GET_SUBBUF: |
795 | { | |
796 | /* | |
797 | * Random access is not allowed for metadata channel. | |
798 | */ | |
799 | return -ENOSYS; | |
800 | } | |
c6f05468 | 801 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
802 | case RING_BUFFER_FLUSH: |
803 | { | |
804 | struct lttng_metadata_stream *stream = filp->private_data; | |
805 | struct lib_ring_buffer *buf = stream->priv; | |
806 | struct channel *chan = buf->backend.chan; | |
807 | ||
808 | /* | |
809 | * Before doing the actual ring buffer flush, write up to one | |
810 | * packet of metadata in the ring buffer. | |
811 | */ | |
812 | ret = lttng_metadata_output_channel(stream, chan); | |
813 | if (ret < 0) | |
814 | goto err; | |
815 | break; | |
816 | } | |
9616f0bf JD |
817 | case RING_BUFFER_GET_METADATA_VERSION: |
818 | { | |
819 | struct lttng_metadata_stream *stream = filp->private_data; | |
820 | ||
821 | return put_u64(stream->version, arg); | |
822 | } | |
d1344afa JD |
823 | case RING_BUFFER_METADATA_CACHE_DUMP: |
824 | { | |
825 | struct lttng_metadata_stream *stream = filp->private_data; | |
826 | ||
827 | return lttng_metadata_cache_dump(stream); | |
828 | } | |
d83004aa JD |
829 | default: |
830 | break; | |
831 | } | |
f613e3e6 MD |
832 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
833 | ||
d83004aa | 834 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
835 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
836 | if (ret < 0) | |
837 | goto err; | |
d83004aa | 838 | |
f613e3e6 MD |
839 | switch (cmd) { |
840 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
841 | { | |
842 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
843 | cmd, arg); | |
844 | break; | |
845 | } | |
846 | default: | |
847 | break; | |
848 | } | |
d83004aa JD |
849 | err: |
850 | return ret; | |
851 | } | |
852 | ||
aeb9064d | 853 | #ifdef CONFIG_COMPAT |
d83004aa JD |
854 | static |
855 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
856 | unsigned int cmd, unsigned long arg) | |
857 | { | |
858 | int ret; | |
859 | struct lttng_metadata_stream *stream = filp->private_data; | |
860 | struct lib_ring_buffer *buf = stream->priv; | |
861 | ||
862 | switch (cmd) { | |
d83004aa JD |
863 | case RING_BUFFER_GET_NEXT_SUBBUF: |
864 | { | |
35097f36 JD |
865 | struct lttng_metadata_stream *stream = filp->private_data; |
866 | struct lib_ring_buffer *buf = stream->priv; | |
867 | struct channel *chan = buf->backend.chan; | |
868 | ||
869 | ret = lttng_metadata_output_channel(stream, chan); | |
870 | if (ret > 0) { | |
871 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
872 | ret = 0; | |
873 | } else if (ret < 0) | |
d83004aa JD |
874 | goto err; |
875 | break; | |
876 | } | |
f613e3e6 MD |
877 | case RING_BUFFER_GET_SUBBUF: |
878 | { | |
879 | /* | |
880 | * Random access is not allowed for metadata channel. | |
881 | */ | |
882 | return -ENOSYS; | |
883 | } | |
c6f05468 | 884 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
885 | case RING_BUFFER_FLUSH: |
886 | { | |
887 | struct lttng_metadata_stream *stream = filp->private_data; | |
888 | struct lib_ring_buffer *buf = stream->priv; | |
889 | struct channel *chan = buf->backend.chan; | |
890 | ||
891 | /* | |
892 | * Before doing the actual ring buffer flush, write up to one | |
893 | * packet of metadata in the ring buffer. | |
894 | */ | |
895 | ret = lttng_metadata_output_channel(stream, chan); | |
896 | if (ret < 0) | |
897 | goto err; | |
898 | break; | |
899 | } | |
900 | case RING_BUFFER_GET_METADATA_VERSION: | |
901 | { | |
902 | struct lttng_metadata_stream *stream = filp->private_data; | |
903 | ||
904 | return put_u64(stream->version, arg); | |
905 | } | |
d1344afa JD |
906 | case RING_BUFFER_METADATA_CACHE_DUMP: |
907 | { | |
908 | struct lttng_metadata_stream *stream = filp->private_data; | |
909 | ||
910 | return lttng_metadata_cache_dump(stream); | |
911 | } | |
d83004aa JD |
912 | default: |
913 | break; | |
914 | } | |
f613e3e6 MD |
915 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
916 | ||
d83004aa | 917 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
918 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
919 | if (ret < 0) | |
920 | goto err; | |
d83004aa | 921 | |
f613e3e6 MD |
922 | switch (cmd) { |
923 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
924 | { | |
925 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
926 | cmd, arg); | |
927 | break; | |
928 | } | |
929 | default: | |
930 | break; | |
931 | } | |
d83004aa JD |
932 | err: |
933 | return ret; | |
934 | } | |
aeb9064d | 935 | #endif |
d83004aa | 936 | |
b3b8072b MD |
937 | /* |
938 | * This is not used by anonymous file descriptors. This code is left | |
939 | * there if we ever want to implement an inode with open() operation. | |
940 | */ | |
d83004aa JD |
941 | static |
942 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
943 | { | |
944 | struct lttng_metadata_stream *stream = inode->i_private; | |
945 | struct lib_ring_buffer *buf = stream->priv; | |
946 | ||
947 | file->private_data = buf; | |
b3b8072b MD |
948 | /* |
949 | * Since life-time of metadata cache differs from that of | |
950 | * session, we need to keep our own reference on the transport. | |
951 | */ | |
952 | if (!try_module_get(stream->transport->owner)) { | |
953 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
954 | return -EBUSY; | |
955 | } | |
d83004aa JD |
956 | return lib_ring_buffer_open(inode, file, buf); |
957 | } | |
958 | ||
959 | static | |
960 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
961 | { | |
962 | struct lttng_metadata_stream *stream = file->private_data; | |
963 | struct lib_ring_buffer *buf = stream->priv; | |
964 | ||
965 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 966 | module_put(stream->transport->owner); |
d83004aa JD |
967 | return lib_ring_buffer_release(inode, file, buf); |
968 | } | |
969 | ||
970 | static | |
971 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
972 | struct pipe_inode_info *pipe, size_t len, | |
973 | unsigned int flags) | |
974 | { | |
975 | struct lttng_metadata_stream *stream = in->private_data; | |
976 | struct lib_ring_buffer *buf = stream->priv; | |
977 | ||
978 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
979 | flags, buf); | |
980 | } | |
981 | ||
982 | static | |
983 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
984 | struct vm_area_struct *vma) | |
985 | { | |
986 | struct lttng_metadata_stream *stream = filp->private_data; | |
987 | struct lib_ring_buffer *buf = stream->priv; | |
988 | ||
989 | return lib_ring_buffer_mmap(filp, vma, buf); | |
990 | } | |
991 | ||
992 | static | |
993 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
994 | .owner = THIS_MODULE, | |
995 | .open = lttng_metadata_ring_buffer_open, | |
996 | .release = lttng_metadata_ring_buffer_release, | |
997 | .poll = lttng_metadata_ring_buffer_poll, | |
998 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
999 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1000 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1001 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1002 | #ifdef CONFIG_COMPAT | |
1003 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1004 | #endif | |
1005 | }; | |
1006 | ||
1007 | static | |
1008 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
1009 | const struct file_operations *fops) | |
ad1c05e1 | 1010 | { |
ad1c05e1 | 1011 | int stream_fd, ret; |
11b5a3c2 | 1012 | struct file *stream_file; |
ad1c05e1 | 1013 | |
4ac10b76 | 1014 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1015 | if (stream_fd < 0) { |
1016 | ret = stream_fd; | |
1017 | goto fd_error; | |
1018 | } | |
d83004aa JD |
1019 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
1020 | stream_priv, O_RDWR); | |
c0e31d2e MD |
1021 | if (IS_ERR(stream_file)) { |
1022 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1023 | goto file_error; |
1024 | } | |
409453cb MD |
1025 | /* |
1026 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1027 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1028 | * file descriptor, so we set FMODE_PREAD here. | |
1029 | */ | |
d7b6f197 | 1030 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1031 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1032 | /* |
1033 | * The stream holds a reference to the channel within the generic ring | |
1034 | * buffer library, so no need to hold a refcount on the channel and | |
1035 | * session files here. | |
1036 | */ | |
ad1c05e1 MD |
1037 | return stream_fd; |
1038 | ||
1039 | file_error: | |
1040 | put_unused_fd(stream_fd); | |
d83004aa JD |
1041 | fd_error: |
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | static | |
1046 | int lttng_abi_open_stream(struct file *channel_file) | |
1047 | { | |
1048 | struct lttng_channel *channel = channel_file->private_data; | |
1049 | struct lib_ring_buffer *buf; | |
1050 | int ret; | |
1051 | void *stream_priv; | |
1052 | ||
1053 | buf = channel->ops->buffer_read_open(channel->chan); | |
1054 | if (!buf) | |
1055 | return -ENOENT; | |
1056 | ||
1057 | stream_priv = buf; | |
1058 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 1059 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
1060 | if (ret < 0) |
1061 | goto fd_error; | |
1062 | ||
1063 | return ret; | |
1064 | ||
1065 | fd_error: | |
1066 | channel->ops->buffer_read_close(buf); | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | static | |
1071 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1072 | { | |
1073 | struct lttng_channel *channel = channel_file->private_data; | |
1074 | struct lttng_session *session = channel->session; | |
1075 | struct lib_ring_buffer *buf; | |
1076 | int ret; | |
1077 | struct lttng_metadata_stream *metadata_stream; | |
1078 | void *stream_priv; | |
1079 | ||
1080 | buf = channel->ops->buffer_read_open(channel->chan); | |
1081 | if (!buf) | |
1082 | return -ENOENT; | |
1083 | ||
1084 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1085 | GFP_KERNEL); | |
b3b8072b MD |
1086 | if (!metadata_stream) { |
1087 | ret = -ENOMEM; | |
1088 | goto nomem; | |
1089 | } | |
d83004aa JD |
1090 | metadata_stream->metadata_cache = session->metadata_cache; |
1091 | init_waitqueue_head(&metadata_stream->read_wait); | |
1092 | metadata_stream->priv = buf; | |
1093 | stream_priv = metadata_stream; | |
b3b8072b MD |
1094 | metadata_stream->transport = channel->transport; |
1095 | ||
1096 | /* | |
1097 | * Since life-time of metadata cache differs from that of | |
1098 | * session, we need to keep our own reference on the transport. | |
1099 | */ | |
1100 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1101 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1102 | ret = -EINVAL; | |
1103 | goto notransport; | |
1104 | } | |
1105 | ||
901aaa5f FD |
1106 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1107 | ret = -EOVERFLOW; | |
9c1f4643 | 1108 | goto kref_error; |
901aaa5f FD |
1109 | } |
1110 | ||
d83004aa JD |
1111 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
1112 | <tng_metadata_ring_buffer_file_operations); | |
1113 | if (ret < 0) | |
1114 | goto fd_error; | |
1115 | ||
d83004aa JD |
1116 | list_add(&metadata_stream->list, |
1117 | &session->metadata_cache->metadata_stream); | |
1118 | return ret; | |
1119 | ||
ad1c05e1 | 1120 | fd_error: |
9c1f4643 MD |
1121 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1122 | kref_error: | |
b3b8072b MD |
1123 | module_put(metadata_stream->transport->owner); |
1124 | notransport: | |
1125 | kfree(metadata_stream); | |
1126 | nomem: | |
11b5a3c2 | 1127 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1128 | return ret; |
1129 | } | |
1130 | ||
653fe716 | 1131 | static |
c0e31d2e | 1132 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1133 | struct lttng_kernel_event *event_param) |
653fe716 | 1134 | { |
a90917c3 | 1135 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1136 | int event_fd, ret; |
11b5a3c2 | 1137 | struct file *event_file; |
3c997079 | 1138 | void *priv; |
653fe716 | 1139 | |
6dccd6c1 JD |
1140 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1141 | switch (event_param->instrumentation) { | |
7371f44c | 1142 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1143 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1144 | break; |
ab2277d6 | 1145 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1146 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1147 | break; |
ab2277d6 | 1148 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 1149 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
1150 | break; |
1151 | default: | |
1152 | break; | |
1153 | } | |
33a39a3c MD |
1154 | event_fd = lttng_get_unused_fd(); |
1155 | if (event_fd < 0) { | |
1156 | ret = event_fd; | |
1157 | goto fd_error; | |
1158 | } | |
1159 | event_file = anon_inode_getfile("[lttng_event]", | |
1160 | <tng_event_fops, | |
1161 | NULL, O_RDWR); | |
1162 | if (IS_ERR(event_file)) { | |
1163 | ret = PTR_ERR(event_file); | |
1164 | goto file_error; | |
1165 | } | |
9c1f4643 | 1166 | /* The event holds a reference on the channel */ |
98d7281c | 1167 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1168 | ret = -EOVERFLOW; |
9c1f4643 MD |
1169 | goto refcount_error; |
1170 | } | |
33a39a3c MD |
1171 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1172 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1173 | struct lttng_enabler *enabler; | |
1174 | ||
4993071a PP |
1175 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1176 | /* | |
1177 | * If the event name is a star globbing pattern, | |
1178 | * we create the special star globbing enabler. | |
1179 | */ | |
1180 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, | |
33a39a3c | 1181 | event_param, channel); |
3c997079 | 1182 | } else { |
33a39a3c MD |
1183 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1184 | event_param, channel); | |
1ec65de1 | 1185 | } |
33a39a3c MD |
1186 | priv = enabler; |
1187 | } else { | |
1188 | struct lttng_event *event; | |
4ee2453d | 1189 | |
33a39a3c MD |
1190 | /* |
1191 | * We tolerate no failure path after event creation. It | |
1192 | * will stay invariant for the rest of the session. | |
1193 | */ | |
1194 | event = lttng_event_create(channel, event_param, | |
1195 | NULL, NULL, | |
1196 | event_param->instrumentation); | |
1197 | WARN_ON_ONCE(!event); | |
1198 | if (IS_ERR(event)) { | |
1199 | ret = PTR_ERR(event); | |
1200 | goto event_error; | |
80f87dd2 | 1201 | } |
33a39a3c | 1202 | priv = event; |
03037b98 | 1203 | } |
33a39a3c MD |
1204 | event_file->private_data = priv; |
1205 | fd_install(event_fd, event_file); | |
653fe716 MD |
1206 | return event_fd; |
1207 | ||
03037b98 | 1208 | event_error: |
9c1f4643 MD |
1209 | atomic_long_dec(&channel_file->f_count); |
1210 | refcount_error: | |
c0e31d2e | 1211 | fput(event_file); |
653fe716 MD |
1212 | file_error: |
1213 | put_unused_fd(event_fd); | |
1214 | fd_error: | |
653fe716 MD |
1215 | return ret; |
1216 | } | |
ad1c05e1 MD |
1217 | |
1218 | /** | |
1219 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1220 | * | |
c0e31d2e | 1221 | * @file: the file |
ad1c05e1 MD |
1222 | * @cmd: the command |
1223 | * @arg: command arg | |
1224 | * | |
1225 | * This ioctl implements lttng commands: | |
38d024ae | 1226 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1227 | * Returns an event stream file descriptor or failure. |
1228 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1229 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1230 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1231 | * LTTNG_KERNEL_CONTEXT |
1232 | * Prepend a context field to each event in the channel | |
e64957da MD |
1233 | * LTTNG_KERNEL_ENABLE |
1234 | * Enable recording for events in this channel (weak enable) | |
1235 | * LTTNG_KERNEL_DISABLE | |
1236 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1237 | * |
baf20995 MD |
1238 | * Channel and event file descriptors also hold a reference on the session. |
1239 | */ | |
ad1c05e1 | 1240 | static |
c0e31d2e | 1241 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1242 | { |
a90917c3 | 1243 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1244 | |
baf20995 | 1245 | switch (cmd) { |
6dccd6c1 | 1246 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1247 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1248 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1249 | case LTTNG_KERNEL_OLD_EVENT: |
1250 | { | |
1251 | struct lttng_kernel_event *uevent_param; | |
1252 | struct lttng_kernel_old_event *old_uevent_param; | |
1253 | int ret; | |
1254 | ||
1255 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1256 | GFP_KERNEL); | |
1257 | if (!uevent_param) { | |
1258 | ret = -ENOMEM; | |
1259 | goto old_event_end; | |
1260 | } | |
1261 | old_uevent_param = kmalloc( | |
1262 | sizeof(struct lttng_kernel_old_event), | |
1263 | GFP_KERNEL); | |
1264 | if (!old_uevent_param) { | |
1265 | ret = -ENOMEM; | |
1266 | goto old_event_error_free_param; | |
1267 | } | |
1268 | if (copy_from_user(old_uevent_param, | |
1269 | (struct lttng_kernel_old_event __user *) arg, | |
1270 | sizeof(struct lttng_kernel_old_event))) { | |
1271 | ret = -EFAULT; | |
1272 | goto old_event_error_free_old_param; | |
1273 | } | |
1274 | ||
1275 | memcpy(uevent_param->name, old_uevent_param->name, | |
1276 | sizeof(uevent_param->name)); | |
1277 | uevent_param->instrumentation = | |
1278 | old_uevent_param->instrumentation; | |
1279 | ||
1280 | switch (old_uevent_param->instrumentation) { | |
1281 | case LTTNG_KERNEL_KPROBE: | |
1282 | uevent_param->u.kprobe.addr = | |
1283 | old_uevent_param->u.kprobe.addr; | |
1284 | uevent_param->u.kprobe.offset = | |
1285 | old_uevent_param->u.kprobe.offset; | |
1286 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1287 | old_uevent_param->u.kprobe.symbol_name, | |
1288 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1289 | break; | |
1290 | case LTTNG_KERNEL_KRETPROBE: | |
1291 | uevent_param->u.kretprobe.addr = | |
1292 | old_uevent_param->u.kretprobe.addr; | |
1293 | uevent_param->u.kretprobe.offset = | |
1294 | old_uevent_param->u.kretprobe.offset; | |
1295 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1296 | old_uevent_param->u.kretprobe.symbol_name, | |
1297 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1298 | break; | |
1299 | case LTTNG_KERNEL_FUNCTION: | |
1300 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1301 | old_uevent_param->u.ftrace.symbol_name, | |
1302 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1303 | break; | |
1304 | default: | |
1305 | break; | |
1306 | } | |
1307 | ret = lttng_abi_create_event(file, uevent_param); | |
1308 | ||
1309 | old_event_error_free_old_param: | |
1310 | kfree(old_uevent_param); | |
1311 | old_event_error_free_param: | |
1312 | kfree(uevent_param); | |
1313 | old_event_end: | |
1314 | return ret; | |
1315 | } | |
38d024ae | 1316 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1317 | { |
1318 | struct lttng_kernel_event uevent_param; | |
1319 | ||
1320 | if (copy_from_user(&uevent_param, | |
1321 | (struct lttng_kernel_event __user *) arg, | |
1322 | sizeof(uevent_param))) | |
1323 | return -EFAULT; | |
1324 | return lttng_abi_create_event(file, &uevent_param); | |
1325 | } | |
1326 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1327 | { | |
1328 | struct lttng_kernel_context *ucontext_param; | |
1329 | struct lttng_kernel_old_context *old_ucontext_param; | |
1330 | int ret; | |
1331 | ||
1332 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1333 | GFP_KERNEL); | |
1334 | if (!ucontext_param) { | |
1335 | ret = -ENOMEM; | |
1336 | goto old_ctx_end; | |
1337 | } | |
1338 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1339 | GFP_KERNEL); | |
1340 | if (!old_ucontext_param) { | |
1341 | ret = -ENOMEM; | |
1342 | goto old_ctx_error_free_param; | |
1343 | } | |
1344 | ||
1345 | if (copy_from_user(old_ucontext_param, | |
1346 | (struct lttng_kernel_old_context __user *) arg, | |
1347 | sizeof(struct lttng_kernel_old_context))) { | |
1348 | ret = -EFAULT; | |
1349 | goto old_ctx_error_free_old_param; | |
1350 | } | |
1351 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1352 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1353 | sizeof(ucontext_param->padding)); | |
1354 | /* only type that uses the union */ | |
1355 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1356 | ucontext_param->u.perf_counter.type = | |
1357 | old_ucontext_param->u.perf_counter.type; | |
1358 | ucontext_param->u.perf_counter.config = | |
1359 | old_ucontext_param->u.perf_counter.config; | |
1360 | memcpy(ucontext_param->u.perf_counter.name, | |
1361 | old_ucontext_param->u.perf_counter.name, | |
1362 | sizeof(ucontext_param->u.perf_counter.name)); | |
1363 | } | |
1364 | ||
1365 | ret = lttng_abi_add_context(file, | |
1366 | ucontext_param, | |
1367 | &channel->ctx, channel->session); | |
1368 | ||
1369 | old_ctx_error_free_old_param: | |
1370 | kfree(old_ucontext_param); | |
1371 | old_ctx_error_free_param: | |
1372 | kfree(ucontext_param); | |
1373 | old_ctx_end: | |
1374 | return ret; | |
1375 | } | |
8070f5c0 | 1376 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1377 | { |
1378 | struct lttng_kernel_context ucontext_param; | |
1379 | ||
1380 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1381 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1382 | sizeof(ucontext_param))) |
1383 | return -EFAULT; | |
1384 | return lttng_abi_add_context(file, | |
1385 | &ucontext_param, | |
8070f5c0 | 1386 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1387 | } |
1388 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1389 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1390 | return lttng_channel_enable(channel); |
6dccd6c1 | 1391 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1392 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1393 | return lttng_channel_disable(channel); |
12e579db MD |
1394 | case LTTNG_KERNEL_SYSCALL_MASK: |
1395 | return lttng_channel_syscall_mask(channel, | |
1396 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1397 | default: |
1398 | return -ENOIOCTLCMD; | |
1399 | } | |
1400 | } | |
1401 | ||
5dbbdb43 MD |
1402 | /** |
1403 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1404 | * | |
1405 | * @file: the file | |
1406 | * @cmd: the command | |
1407 | * @arg: command arg | |
1408 | * | |
1409 | * This ioctl implements lttng commands: | |
38d024ae | 1410 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1411 | * Returns an event stream file descriptor or failure. |
1412 | * | |
1413 | * Channel and event file descriptors also hold a reference on the session. | |
1414 | */ | |
1415 | static | |
1416 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1417 | { | |
1418 | switch (cmd) { | |
6dccd6c1 | 1419 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1420 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1421 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1422 | default: |
1423 | return -ENOIOCTLCMD; | |
1424 | } | |
1425 | } | |
1426 | ||
653fe716 MD |
1427 | /** |
1428 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1429 | * | |
c0e31d2e | 1430 | * @file: the file |
653fe716 MD |
1431 | * @wait: poll table |
1432 | */ | |
c0e31d2e | 1433 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1434 | { |
a90917c3 | 1435 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1436 | unsigned int mask = 0; |
1437 | ||
c0e31d2e | 1438 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1439 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1440 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1441 | wait); | |
653fe716 | 1442 | |
254ec7bc MD |
1443 | if (channel->ops->is_disabled(channel->chan)) |
1444 | return POLLERR; | |
24cedcfe | 1445 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1446 | return POLLHUP; |
f71ecafa | 1447 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1448 | return POLLIN | POLLRDNORM; |
f71ecafa | 1449 | return 0; |
653fe716 MD |
1450 | } |
1451 | return mask; | |
1452 | ||
1453 | } | |
1454 | ||
0a84a57f MD |
1455 | static |
1456 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1457 | { | |
a90917c3 | 1458 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1459 | |
1460 | if (channel) | |
1461 | fput(channel->session->file); | |
0a84a57f MD |
1462 | return 0; |
1463 | } | |
1464 | ||
d83004aa JD |
1465 | static |
1466 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1467 | { | |
1468 | struct lttng_channel *channel = file->private_data; | |
1469 | ||
1470 | if (channel) { | |
d83004aa | 1471 | fput(channel->session->file); |
a3381417 | 1472 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1473 | } |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
ad1c05e1 | 1478 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1479 | .owner = THIS_MODULE, |
03037b98 | 1480 | .release = lttng_channel_release, |
653fe716 | 1481 | .poll = lttng_channel_poll, |
ad1c05e1 | 1482 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1483 | #ifdef CONFIG_COMPAT |
03037b98 | 1484 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1485 | #endif |
11b5a3c2 | 1486 | }; |
baf20995 | 1487 | |
5dbbdb43 | 1488 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1489 | .owner = THIS_MODULE, |
d83004aa | 1490 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1491 | .unlocked_ioctl = lttng_metadata_ioctl, |
1492 | #ifdef CONFIG_COMPAT | |
1493 | .compat_ioctl = lttng_metadata_ioctl, | |
1494 | #endif | |
1495 | }; | |
1496 | ||
8070f5c0 MD |
1497 | /** |
1498 | * lttng_event_ioctl - lttng syscall through ioctl | |
1499 | * | |
1500 | * @file: the file | |
1501 | * @cmd: the command | |
1502 | * @arg: command arg | |
1503 | * | |
1504 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1505 | * LTTNG_KERNEL_CONTEXT |
1506 | * Prepend a context field to each record of this event | |
e64957da MD |
1507 | * LTTNG_KERNEL_ENABLE |
1508 | * Enable recording for this event (weak enable) | |
1509 | * LTTNG_KERNEL_DISABLE | |
1510 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1511 | */ |
1512 | static | |
1513 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1514 | { | |
3c997079 MD |
1515 | struct lttng_event *event; |
1516 | struct lttng_enabler *enabler; | |
1517 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1518 | |
1519 | switch (cmd) { | |
6dccd6c1 JD |
1520 | case LTTNG_KERNEL_OLD_CONTEXT: |
1521 | { | |
3c997079 MD |
1522 | /* Not implemented */ |
1523 | return -ENOSYS; | |
6dccd6c1 | 1524 | } |
8070f5c0 | 1525 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1526 | { |
3c997079 MD |
1527 | /* Not implemented */ |
1528 | return -ENOSYS; | |
6dccd6c1 JD |
1529 | } |
1530 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1531 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1532 | switch (*evtype) { |
1533 | case LTTNG_TYPE_EVENT: | |
1534 | event = file->private_data; | |
1535 | return lttng_event_enable(event); | |
1536 | case LTTNG_TYPE_ENABLER: | |
1537 | enabler = file->private_data; | |
1538 | return lttng_enabler_enable(enabler); | |
1539 | default: | |
1540 | WARN_ON_ONCE(1); | |
1541 | return -ENOSYS; | |
1542 | } | |
6dccd6c1 | 1543 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1544 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1545 | switch (*evtype) { |
1546 | case LTTNG_TYPE_EVENT: | |
1547 | event = file->private_data; | |
1548 | return lttng_event_disable(event); | |
1549 | case LTTNG_TYPE_ENABLER: | |
1550 | enabler = file->private_data; | |
1551 | return lttng_enabler_disable(enabler); | |
1552 | default: | |
1553 | WARN_ON_ONCE(1); | |
1554 | return -ENOSYS; | |
1555 | } | |
07dfc1d0 MD |
1556 | case LTTNG_KERNEL_FILTER: |
1557 | switch (*evtype) { | |
1558 | case LTTNG_TYPE_EVENT: | |
1559 | return -EINVAL; | |
1560 | case LTTNG_TYPE_ENABLER: | |
1561 | { | |
1562 | enabler = file->private_data; | |
1563 | return lttng_enabler_attach_bytecode(enabler, | |
1564 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1565 | } | |
0586316f MD |
1566 | default: |
1567 | WARN_ON_ONCE(1); | |
1568 | return -ENOSYS; | |
07dfc1d0 | 1569 | } |
3aed4dca FD |
1570 | case LTTNG_KERNEL_ADD_CALLSITE: |
1571 | switch (*evtype) { | |
1572 | case LTTNG_TYPE_EVENT: | |
1573 | event = file->private_data; | |
1574 | return lttng_event_add_callsite(event, | |
1575 | (struct lttng_kernel_event_callsite __user *) arg); | |
1576 | case LTTNG_TYPE_ENABLER: | |
1577 | return -EINVAL; | |
1578 | } | |
8070f5c0 MD |
1579 | default: |
1580 | return -ENOIOCTLCMD; | |
1581 | } | |
1582 | } | |
1583 | ||
0a84a57f MD |
1584 | static |
1585 | int lttng_event_release(struct inode *inode, struct file *file) | |
1586 | { | |
3c997079 MD |
1587 | struct lttng_event *event; |
1588 | struct lttng_enabler *enabler; | |
1589 | enum lttng_event_type *evtype = file->private_data; | |
1590 | ||
1591 | if (!evtype) | |
1592 | return 0; | |
1593 | ||
1594 | switch (*evtype) { | |
1595 | case LTTNG_TYPE_EVENT: | |
1596 | event = file->private_data; | |
1597 | if (event) | |
1598 | fput(event->chan->file); | |
1599 | break; | |
1600 | case LTTNG_TYPE_ENABLER: | |
1601 | enabler = file->private_data; | |
1602 | if (enabler) | |
1603 | fput(enabler->chan->file); | |
1604 | break; | |
1605 | default: | |
1606 | WARN_ON_ONCE(1); | |
1607 | break; | |
1608 | } | |
c269fff4 | 1609 | |
0a84a57f MD |
1610 | return 0; |
1611 | } | |
1612 | ||
3b923e5b | 1613 | /* TODO: filter control ioctl */ |
0a84a57f | 1614 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1615 | .owner = THIS_MODULE, |
0a84a57f | 1616 | .release = lttng_event_release, |
8070f5c0 MD |
1617 | .unlocked_ioctl = lttng_event_ioctl, |
1618 | #ifdef CONFIG_COMPAT | |
1619 | .compat_ioctl = lttng_event_ioctl, | |
1620 | #endif | |
11b5a3c2 | 1621 | }; |
0a84a57f | 1622 | |
3b731ab1 JD |
1623 | static int put_u64(uint64_t val, unsigned long arg) |
1624 | { | |
1625 | return put_user(val, (uint64_t __user *) arg); | |
1626 | } | |
1627 | ||
ed8d02d6 JD |
1628 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1629 | unsigned int cmd, unsigned long arg) | |
1630 | { | |
3b731ab1 JD |
1631 | struct lib_ring_buffer *buf = filp->private_data; |
1632 | struct channel *chan = buf->backend.chan; | |
1633 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1634 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1635 | int ret; |
1636 | ||
1637 | if (atomic_read(&chan->record_disabled)) | |
1638 | return -EIO; | |
1639 | ||
ed8d02d6 | 1640 | switch (cmd) { |
3b731ab1 JD |
1641 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1642 | { | |
1643 | uint64_t ts; | |
1644 | ||
dd5a0db3 | 1645 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1646 | if (ret < 0) |
1647 | goto error; | |
1648 | return put_u64(ts, arg); | |
1649 | } | |
1650 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1651 | { | |
1652 | uint64_t ts; | |
1653 | ||
dd5a0db3 | 1654 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1655 | if (ret < 0) |
1656 | goto error; | |
1657 | return put_u64(ts, arg); | |
1658 | } | |
1659 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1660 | { | |
1661 | uint64_t ed; | |
1662 | ||
dd5a0db3 | 1663 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1664 | if (ret < 0) |
1665 | goto error; | |
1666 | return put_u64(ed, arg); | |
1667 | } | |
1668 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1669 | { | |
1670 | uint64_t cs; | |
1671 | ||
dd5a0db3 | 1672 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1673 | if (ret < 0) |
1674 | goto error; | |
1675 | return put_u64(cs, arg); | |
1676 | } | |
1677 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1678 | { | |
1679 | uint64_t ps; | |
1680 | ||
dd5a0db3 | 1681 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1682 | if (ret < 0) |
1683 | goto error; | |
1684 | return put_u64(ps, arg); | |
1685 | } | |
1686 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1687 | { | |
1688 | uint64_t si; | |
1689 | ||
dd5a0db3 | 1690 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1691 | if (ret < 0) |
1692 | goto error; | |
1693 | return put_u64(si, arg); | |
1694 | } | |
2348ca17 JD |
1695 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1696 | { | |
1697 | uint64_t ts; | |
1698 | ||
dd5a0db3 | 1699 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1700 | if (ret < 0) |
1701 | goto error; | |
1702 | return put_u64(ts, arg); | |
1703 | } | |
5b3cf4f9 JD |
1704 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1705 | { | |
1706 | uint64_t seq; | |
1707 | ||
1708 | ret = ops->sequence_number(config, buf, &seq); | |
1709 | if (ret < 0) | |
1710 | goto error; | |
1711 | return put_u64(seq, arg); | |
1712 | } | |
5594698f JD |
1713 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1714 | { | |
1715 | uint64_t id; | |
1716 | ||
1717 | ret = ops->instance_id(config, buf, &id); | |
1718 | if (ret < 0) | |
1719 | goto error; | |
1720 | return put_u64(id, arg); | |
1721 | } | |
3b731ab1 JD |
1722 | default: |
1723 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1724 | cmd, arg); | |
ed8d02d6 | 1725 | } |
3b731ab1 JD |
1726 | |
1727 | error: | |
1728 | return -ENOSYS; | |
ed8d02d6 JD |
1729 | } |
1730 | ||
1731 | #ifdef CONFIG_COMPAT | |
1732 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1733 | unsigned int cmd, unsigned long arg) | |
1734 | { | |
3b731ab1 JD |
1735 | struct lib_ring_buffer *buf = filp->private_data; |
1736 | struct channel *chan = buf->backend.chan; | |
1737 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1738 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1739 | int ret; |
1740 | ||
1741 | if (atomic_read(&chan->record_disabled)) | |
1742 | return -EIO; | |
1743 | ||
ed8d02d6 | 1744 | switch (cmd) { |
3b731ab1 JD |
1745 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1746 | { | |
1747 | uint64_t ts; | |
1748 | ||
dd5a0db3 | 1749 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1750 | if (ret < 0) |
1751 | goto error; | |
1752 | return put_u64(ts, arg); | |
1753 | } | |
1754 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1755 | { | |
1756 | uint64_t ts; | |
1757 | ||
dd5a0db3 | 1758 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1759 | if (ret < 0) |
1760 | goto error; | |
1761 | return put_u64(ts, arg); | |
1762 | } | |
1763 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1764 | { | |
1765 | uint64_t ed; | |
1766 | ||
dd5a0db3 | 1767 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1768 | if (ret < 0) |
1769 | goto error; | |
1770 | return put_u64(ed, arg); | |
ed8d02d6 | 1771 | } |
3b731ab1 JD |
1772 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1773 | { | |
1774 | uint64_t cs; | |
1775 | ||
dd5a0db3 | 1776 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1777 | if (ret < 0) |
1778 | goto error; | |
1779 | return put_u64(cs, arg); | |
1780 | } | |
1781 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1782 | { | |
1783 | uint64_t ps; | |
1784 | ||
dd5a0db3 | 1785 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1786 | if (ret < 0) |
1787 | goto error; | |
1788 | return put_u64(ps, arg); | |
1789 | } | |
1790 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1791 | { | |
1792 | uint64_t si; | |
1793 | ||
dd5a0db3 | 1794 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1795 | if (ret < 0) |
1796 | goto error; | |
1797 | return put_u64(si, arg); | |
1798 | } | |
2348ca17 JD |
1799 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1800 | { | |
1801 | uint64_t ts; | |
1802 | ||
dd5a0db3 | 1803 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1804 | if (ret < 0) |
1805 | goto error; | |
1806 | return put_u64(ts, arg); | |
1807 | } | |
5b3cf4f9 JD |
1808 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
1809 | { | |
1810 | uint64_t seq; | |
1811 | ||
1812 | ret = ops->sequence_number(config, buf, &seq); | |
1813 | if (ret < 0) | |
1814 | goto error; | |
1815 | return put_u64(seq, arg); | |
1816 | } | |
5594698f JD |
1817 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
1818 | { | |
1819 | uint64_t id; | |
1820 | ||
1821 | ret = ops->instance_id(config, buf, &id); | |
1822 | if (ret < 0) | |
1823 | goto error; | |
1824 | return put_u64(id, arg); | |
1825 | } | |
3b731ab1 JD |
1826 | default: |
1827 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1828 | cmd, arg); | |
1829 | } | |
1830 | ||
1831 | error: | |
1832 | return -ENOSYS; | |
ed8d02d6 JD |
1833 | } |
1834 | #endif /* CONFIG_COMPAT */ | |
1835 | ||
1836 | static void lttng_stream_override_ring_buffer_fops(void) | |
1837 | { | |
1838 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1839 | lttng_stream_ring_buffer_file_operations.open = | |
1840 | lib_ring_buffer_file_operations.open; | |
1841 | lttng_stream_ring_buffer_file_operations.release = | |
1842 | lib_ring_buffer_file_operations.release; | |
1843 | lttng_stream_ring_buffer_file_operations.poll = | |
1844 | lib_ring_buffer_file_operations.poll; | |
1845 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1846 | lib_ring_buffer_file_operations.splice_read; | |
1847 | lttng_stream_ring_buffer_file_operations.mmap = | |
1848 | lib_ring_buffer_file_operations.mmap; | |
1849 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1850 | lttng_stream_ring_buffer_ioctl; | |
1851 | lttng_stream_ring_buffer_file_operations.llseek = | |
1852 | lib_ring_buffer_file_operations.llseek; | |
1853 | #ifdef CONFIG_COMPAT | |
1854 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1855 | lttng_stream_ring_buffer_compat_ioctl; | |
1856 | #endif | |
1857 | } | |
1858 | ||
80996790 | 1859 | int __init lttng_abi_init(void) |
baf20995 MD |
1860 | { |
1861 | int ret = 0; | |
1862 | ||
6d2a620c | 1863 | wrapper_vmalloc_sync_all(); |
2754583e | 1864 | lttng_clock_ref(); |
f771eda6 JD |
1865 | |
1866 | ret = lttng_tp_mempool_init(); | |
1867 | if (ret) { | |
1868 | goto error; | |
1869 | } | |
1870 | ||
d29348f7 | 1871 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 | 1872 | <tng_fops, NULL); |
2470a237 | 1873 | |
255e52a4 | 1874 | if (!lttng_proc_dentry) { |
baf20995 MD |
1875 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1876 | ret = -ENOMEM; | |
1877 | goto error; | |
1878 | } | |
ed8d02d6 | 1879 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 1880 | return 0; |
ed8d02d6 | 1881 | |
baf20995 | 1882 | error: |
f771eda6 | 1883 | lttng_tp_mempool_destroy(); |
2754583e | 1884 | lttng_clock_unref(); |
baf20995 MD |
1885 | return ret; |
1886 | } | |
1887 | ||
e6e65fcd MD |
1888 | /* No __exit annotation because used by init error path too. */ |
1889 | void lttng_abi_exit(void) | |
baf20995 | 1890 | { |
f771eda6 | 1891 | lttng_tp_mempool_destroy(); |
2754583e | 1892 | lttng_clock_unref(); |
e6a17f26 MD |
1893 | if (lttng_proc_dentry) |
1894 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1895 | } |