Commit | Line | Data |
---|---|---|
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> |
241ae9a8 MD |
33 | #include <wrapper/ringbuffer/vfs.h> |
34 | #include <wrapper/ringbuffer/backend.h> | |
35 | #include <wrapper/ringbuffer/frontend.h> | |
36 | #include <wrapper/poll.h> | |
37 | #include <wrapper/file.h> | |
38 | #include <wrapper/kref.h> | |
4993071a | 39 | #include <lttng-string-utils.h> |
241ae9a8 MD |
40 | #include <lttng-abi.h> |
41 | #include <lttng-abi-old.h> | |
42 | #include <lttng-events.h> | |
43 | #include <lttng-tracer.h> | |
f771eda6 | 44 | #include <lttng-tp-mempool.h> |
241ae9a8 | 45 | #include <lib/ringbuffer/frontend_types.h> |
baf20995 MD |
46 | |
47 | /* | |
48 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 49 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
50 | */ |
51 | ||
e6a17f26 | 52 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
53 | |
54 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
55 | static const struct proc_ops lttng_proc_ops; | |
56 | #else | |
57 | static const struct file_operations lttng_proc_ops; | |
58 | #endif | |
59 | ||
ad1c05e1 MD |
60 | static const struct file_operations lttng_session_fops; |
61 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 62 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 63 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 64 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 65 | |
9616f0bf JD |
66 | static int put_u64(uint64_t val, unsigned long arg); |
67 | ||
a33c9927 MD |
68 | /* |
69 | * Teardown management: opened file descriptors keep a refcount on the module, | |
70 | * so it can only exit when all file descriptors are closed. | |
71 | */ | |
72 | ||
ad1c05e1 | 73 | static |
baf20995 MD |
74 | int lttng_abi_create_session(void) |
75 | { | |
a90917c3 | 76 | struct lttng_session *session; |
c0e31d2e | 77 | struct file *session_file; |
11b5a3c2 | 78 | int session_fd, ret; |
baf20995 | 79 | |
a90917c3 | 80 | session = lttng_session_create(); |
baf20995 MD |
81 | if (!session) |
82 | return -ENOMEM; | |
4ac10b76 | 83 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
84 | if (session_fd < 0) { |
85 | ret = session_fd; | |
86 | goto fd_error; | |
87 | } | |
c0e31d2e | 88 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 89 | <tng_session_fops, |
baf20995 | 90 | session, O_RDWR); |
c0e31d2e MD |
91 | if (IS_ERR(session_file)) { |
92 | ret = PTR_ERR(session_file); | |
baf20995 MD |
93 | goto file_error; |
94 | } | |
c0e31d2e MD |
95 | session->file = session_file; |
96 | fd_install(session_fd, session_file); | |
baf20995 MD |
97 | return session_fd; |
98 | ||
99 | file_error: | |
100 | put_unused_fd(session_fd); | |
101 | fd_error: | |
a90917c3 | 102 | lttng_session_destroy(session); |
baf20995 MD |
103 | return ret; |
104 | } | |
105 | ||
271b6681 MD |
106 | static |
107 | int lttng_abi_tracepoint_list(void) | |
108 | { | |
109 | struct file *tracepoint_list_file; | |
110 | int file_fd, ret; | |
111 | ||
4ac10b76 | 112 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
113 | if (file_fd < 0) { |
114 | ret = file_fd; | |
115 | goto fd_error; | |
116 | } | |
30f18bf0 | 117 | |
8ee099b6 | 118 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
119 | <tng_tracepoint_list_fops, |
120 | NULL, O_RDWR); | |
121 | if (IS_ERR(tracepoint_list_file)) { | |
122 | ret = PTR_ERR(tracepoint_list_file); | |
123 | goto file_error; | |
124 | } | |
30f18bf0 MD |
125 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
126 | if (ret < 0) | |
127 | goto open_error; | |
271b6681 MD |
128 | fd_install(file_fd, tracepoint_list_file); |
129 | return file_fd; | |
130 | ||
30f18bf0 MD |
131 | open_error: |
132 | fput(tracepoint_list_file); | |
271b6681 MD |
133 | file_error: |
134 | put_unused_fd(file_fd); | |
135 | fd_error: | |
136 | return ret; | |
137 | } | |
138 | ||
f127e61e MD |
139 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
140 | static inline | |
141 | int lttng_abi_syscall_list(void) | |
142 | { | |
143 | return -ENOSYS; | |
144 | } | |
145 | #else | |
146 | static | |
147 | int lttng_abi_syscall_list(void) | |
148 | { | |
149 | struct file *syscall_list_file; | |
150 | int file_fd, ret; | |
151 | ||
152 | file_fd = lttng_get_unused_fd(); | |
153 | if (file_fd < 0) { | |
154 | ret = file_fd; | |
155 | goto fd_error; | |
156 | } | |
157 | ||
158 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
159 | <tng_syscall_list_fops, | |
160 | NULL, O_RDWR); | |
161 | if (IS_ERR(syscall_list_file)) { | |
162 | ret = PTR_ERR(syscall_list_file); | |
163 | goto file_error; | |
164 | } | |
165 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
166 | if (ret < 0) | |
167 | goto open_error; | |
168 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
169 | return file_fd; |
170 | ||
171 | open_error: | |
172 | fput(syscall_list_file); | |
173 | file_error: | |
174 | put_unused_fd(file_fd); | |
175 | fd_error: | |
176 | return ret; | |
177 | } | |
178 | #endif | |
179 | ||
80c16bcf | 180 | static |
6dccd6c1 | 181 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 182 | { |
6dccd6c1 JD |
183 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
184 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
185 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
186 | } |
187 | ||
42cabb80 MD |
188 | static |
189 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
190 | { | |
191 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
192 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
193 | } | |
194 | ||
8070f5c0 MD |
195 | static |
196 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 197 | struct lttng_kernel_context *context_param, |
a90917c3 | 198 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 199 | { |
8070f5c0 MD |
200 | |
201 | if (session->been_active) | |
202 | return -EPERM; | |
203 | ||
6dccd6c1 | 204 | switch (context_param->ctx) { |
12a313a5 | 205 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 206 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
207 | case LTTNG_KERNEL_CONTEXT_PRIO: |
208 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
209 | case LTTNG_KERNEL_CONTEXT_NICE: |
210 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
211 | case LTTNG_KERNEL_CONTEXT_VPID: |
212 | return lttng_add_vpid_to_ctx(ctx); | |
213 | case LTTNG_KERNEL_CONTEXT_TID: | |
214 | return lttng_add_tid_to_ctx(ctx); | |
215 | case LTTNG_KERNEL_CONTEXT_VTID: | |
216 | return lttng_add_vtid_to_ctx(ctx); | |
217 | case LTTNG_KERNEL_CONTEXT_PPID: | |
218 | return lttng_add_ppid_to_ctx(ctx); | |
219 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
220 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 221 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
222 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
223 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
224 | context_param->u.perf_counter.config, | |
225 | context_param->u.perf_counter.name, | |
c24a0d71 | 226 | ctx); |
a2563e83 MD |
227 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
228 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
229 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
230 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
231 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
232 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
233 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
234 | return lttng_add_interruptible_to_ctx(ctx); | |
235 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
236 | return lttng_add_need_reschedule_to_ctx(ctx); | |
237 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
238 | return lttng_add_preemptible_to_ctx(ctx); | |
239 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
240 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
241 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
242 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
243 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
244 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
245 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
246 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
247 | return lttng_add_ipc_ns_to_ctx(ctx); | |
248 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
249 | return lttng_add_mnt_ns_to_ctx(ctx); | |
250 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
251 | return lttng_add_net_ns_to_ctx(ctx); | |
252 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
253 | return lttng_add_pid_ns_to_ctx(ctx); | |
254 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
255 | return lttng_add_user_ns_to_ctx(ctx); | |
256 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
257 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
258 | case LTTNG_KERNEL_CONTEXT_UID: |
259 | return lttng_add_uid_to_ctx(ctx); | |
260 | case LTTNG_KERNEL_CONTEXT_EUID: | |
261 | return lttng_add_euid_to_ctx(ctx); | |
262 | case LTTNG_KERNEL_CONTEXT_SUID: | |
263 | return lttng_add_suid_to_ctx(ctx); | |
264 | case LTTNG_KERNEL_CONTEXT_GID: | |
265 | return lttng_add_gid_to_ctx(ctx); | |
266 | case LTTNG_KERNEL_CONTEXT_EGID: | |
267 | return lttng_add_egid_to_ctx(ctx); | |
268 | case LTTNG_KERNEL_CONTEXT_SGID: | |
269 | return lttng_add_sgid_to_ctx(ctx); | |
270 | case LTTNG_KERNEL_CONTEXT_VUID: | |
271 | return lttng_add_vuid_to_ctx(ctx); | |
272 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
273 | return lttng_add_veuid_to_ctx(ctx); | |
274 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
275 | return lttng_add_vsuid_to_ctx(ctx); | |
276 | case LTTNG_KERNEL_CONTEXT_VGID: | |
277 | return lttng_add_vgid_to_ctx(ctx); | |
278 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
279 | return lttng_add_vegid_to_ctx(ctx); | |
280 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
281 | return lttng_add_vsgid_to_ctx(ctx); | |
8070f5c0 MD |
282 | default: |
283 | return -EINVAL; | |
284 | } | |
285 | } | |
286 | ||
ad1c05e1 MD |
287 | /** |
288 | * lttng_ioctl - lttng syscall through ioctl | |
289 | * | |
c0e31d2e | 290 | * @file: the file |
ad1c05e1 MD |
291 | * @cmd: the command |
292 | * @arg: command arg | |
293 | * | |
294 | * This ioctl implements lttng commands: | |
38d024ae | 295 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 296 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
297 | * LTTNG_KERNEL_TRACER_VERSION |
298 | * Returns the LTTng kernel tracer version | |
299 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
300 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
301 | * LTTNG_KERNEL_WAIT_QUIESCENT |
302 | * Returns after all previously running probes have completed | |
42cabb80 MD |
303 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
304 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
305 | * |
306 | * The returned session will be deleted when its file descriptor is closed. | |
307 | */ | |
308 | static | |
c0e31d2e | 309 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
310 | { |
311 | switch (cmd) { | |
6dccd6c1 | 312 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 313 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 314 | return lttng_abi_create_session(); |
6dccd6c1 JD |
315 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
316 | { | |
317 | struct lttng_kernel_tracer_version v; | |
318 | struct lttng_kernel_old_tracer_version oldv; | |
319 | struct lttng_kernel_old_tracer_version *uversion = | |
320 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
321 | ||
322 | lttng_abi_tracer_version(&v); | |
323 | oldv.major = v.major; | |
324 | oldv.minor = v.minor; | |
325 | oldv.patchlevel = v.patchlevel; | |
326 | ||
327 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
328 | return -EFAULT; | |
329 | return 0; | |
330 | } | |
80c16bcf | 331 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
332 | { |
333 | struct lttng_kernel_tracer_version version; | |
334 | struct lttng_kernel_tracer_version *uversion = | |
335 | (struct lttng_kernel_tracer_version __user *) arg; | |
336 | ||
337 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
338 | |
339 | if (copy_to_user(uversion, &version, sizeof(version))) | |
340 | return -EFAULT; | |
341 | return 0; | |
342 | } | |
343 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
344 | { | |
345 | struct lttng_kernel_tracer_abi_version version; | |
346 | struct lttng_kernel_tracer_abi_version *uversion = | |
347 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
348 | ||
349 | lttng_abi_tracer_abi_version(&version); | |
350 | ||
6dccd6c1 JD |
351 | if (copy_to_user(uversion, &version, sizeof(version))) |
352 | return -EFAULT; | |
353 | return 0; | |
354 | } | |
355 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
356 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
357 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
358 | case LTTNG_KERNEL_SYSCALL_LIST: |
359 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 360 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
361 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
362 | synchronize_trace(); | |
363 | return 0; | |
6dccd6c1 JD |
364 | case LTTNG_KERNEL_OLD_CALIBRATE: |
365 | { | |
366 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
367 | (struct lttng_kernel_old_calibrate __user *) arg; | |
368 | struct lttng_kernel_old_calibrate old_calibrate; | |
369 | struct lttng_kernel_calibrate calibrate; | |
370 | int ret; | |
371 | ||
372 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
373 | return -EFAULT; | |
374 | calibrate.type = old_calibrate.type; | |
375 | ret = lttng_calibrate(&calibrate); | |
376 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
377 | return -EFAULT; | |
378 | return ret; | |
379 | } | |
57105fc2 MD |
380 | case LTTNG_KERNEL_CALIBRATE: |
381 | { | |
3db41b2c MD |
382 | struct lttng_kernel_calibrate __user *ucalibrate = |
383 | (struct lttng_kernel_calibrate __user *) arg; | |
384 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
385 | int ret; |
386 | ||
387 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
388 | return -EFAULT; | |
389 | ret = lttng_calibrate(&calibrate); | |
390 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
391 | return -EFAULT; | |
392 | return ret; | |
393 | } | |
ad1c05e1 MD |
394 | default: |
395 | return -ENOIOCTLCMD; | |
396 | } | |
397 | } | |
398 | ||
059de147 MJ |
399 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
400 | static const struct proc_ops lttng_proc_ops = { | |
401 | .proc_ioctl = lttng_ioctl, | |
402 | #ifdef CONFIG_COMPAT | |
403 | .proc_compat_ioctl = lttng_ioctl, | |
404 | #endif /* CONFIG_COMPAT */ | |
405 | }; | |
406 | #else | |
407 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 408 | .owner = THIS_MODULE, |
ad1c05e1 MD |
409 | .unlocked_ioctl = lttng_ioctl, |
410 | #ifdef CONFIG_COMPAT | |
03037b98 | 411 | .compat_ioctl = lttng_ioctl, |
059de147 | 412 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 413 | }; |
059de147 | 414 | #endif |
ad1c05e1 | 415 | |
5dbbdb43 | 416 | static |
c0e31d2e | 417 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 418 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 419 | enum channel_type channel_type) |
baf20995 | 420 | { |
a90917c3 | 421 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 422 | const struct file_operations *fops = NULL; |
5dbbdb43 | 423 | const char *transport_name; |
a90917c3 | 424 | struct lttng_channel *chan; |
c0e31d2e | 425 | struct file *chan_file; |
baf20995 | 426 | int chan_fd; |
ad1c05e1 | 427 | int ret = 0; |
baf20995 | 428 | |
4ac10b76 | 429 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
430 | if (chan_fd < 0) { |
431 | ret = chan_fd; | |
432 | goto fd_error; | |
433 | } | |
88dfd899 MD |
434 | switch (channel_type) { |
435 | case PER_CPU_CHANNEL: | |
436 | fops = <tng_channel_fops; | |
437 | break; | |
438 | case METADATA_CHANNEL: | |
439 | fops = <tng_metadata_fops; | |
440 | break; | |
441 | } | |
2470a237 | 442 | |
c0e31d2e | 443 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 444 | fops, |
03037b98 | 445 | NULL, O_RDWR); |
c0e31d2e MD |
446 | if (IS_ERR(chan_file)) { |
447 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
448 | goto file_error; |
449 | } | |
5dbbdb43 MD |
450 | switch (channel_type) { |
451 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
452 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
453 | transport_name = chan_param->overwrite ? | |
96ba7208 | 454 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
455 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
456 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
457 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
458 | } else { | |
459 | return -EINVAL; | |
460 | } | |
5dbbdb43 | 461 | break; |
5dbbdb43 | 462 | case METADATA_CHANNEL: |
6dccd6c1 | 463 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 464 | transport_name = "relay-metadata"; |
6dccd6c1 | 465 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
466 | transport_name = "relay-metadata-mmap"; |
467 | else | |
468 | return -EINVAL; | |
5dbbdb43 MD |
469 | break; |
470 | default: | |
471 | transport_name = "<unknown>"; | |
472 | break; | |
473 | } | |
98d7281c MJ |
474 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
475 | ret = -EOVERFLOW; | |
9c1f4643 MD |
476 | goto refcount_error; |
477 | } | |
03037b98 MD |
478 | /* |
479 | * We tolerate no failure path after channel creation. It will stay | |
480 | * invariant for the rest of the session. | |
481 | */ | |
a90917c3 | 482 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
483 | chan_param->subbuf_size, |
484 | chan_param->num_subbuf, | |
485 | chan_param->switch_timer_interval, | |
d83004aa JD |
486 | chan_param->read_timer_interval, |
487 | channel_type); | |
03037b98 | 488 | if (!chan) { |
f3d01b96 | 489 | ret = -EINVAL; |
03037b98 MD |
490 | goto chan_error; |
491 | } | |
11b5a3c2 | 492 | chan->file = chan_file; |
c0e31d2e MD |
493 | chan_file->private_data = chan; |
494 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 495 | |
baf20995 MD |
496 | return chan_fd; |
497 | ||
03037b98 | 498 | chan_error: |
9c1f4643 MD |
499 | atomic_long_dec(&session_file->f_count); |
500 | refcount_error: | |
c0e31d2e | 501 | fput(chan_file); |
baf20995 MD |
502 | file_error: |
503 | put_unused_fd(chan_fd); | |
504 | fd_error: | |
baf20995 MD |
505 | return ret; |
506 | } | |
507 | ||
7f859fbf JR |
508 | static |
509 | int lttng_abi_session_set_name(struct lttng_session *session, | |
510 | struct lttng_kernel_session_name *name) | |
511 | { | |
512 | size_t len; | |
513 | ||
514 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
515 | ||
516 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
517 | /* Name is too long/malformed */ | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | strcpy(session->name, name->name); | |
522 | return 0; | |
523 | } | |
524 | ||
1c88f269 JR |
525 | static |
526 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
527 | struct lttng_kernel_session_creation_time *time) | |
528 | { | |
529 | size_t len; | |
530 | ||
531 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
532 | ||
533 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
534 | /* Time is too long/malformed */ | |
535 | return -EINVAL; | |
536 | } | |
537 | ||
538 | strcpy(session->creation_time, time->iso8601); | |
539 | return 0; | |
540 | } | |
541 | ||
d1f652f8 MD |
542 | static |
543 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
544 | { | |
545 | switch (tracker->type) { | |
546 | case LTTNG_KERNEL_TRACKER_PID: | |
547 | return TRACKER_PID; | |
548 | case LTTNG_KERNEL_TRACKER_VPID: | |
549 | return TRACKER_VPID; | |
550 | case LTTNG_KERNEL_TRACKER_UID: | |
551 | return TRACKER_UID; | |
552 | case LTTNG_KERNEL_TRACKER_VUID: | |
553 | return TRACKER_VUID; | |
554 | case LTTNG_KERNEL_TRACKER_GID: | |
555 | return TRACKER_GID; | |
556 | case LTTNG_KERNEL_TRACKER_VGID: | |
557 | return TRACKER_VGID; | |
558 | default: | |
559 | return TRACKER_UNKNOWN; | |
560 | } | |
561 | } | |
562 | ||
baf20995 | 563 | /** |
ad1c05e1 | 564 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 565 | * |
c0e31d2e | 566 | * @file: the file |
baf20995 MD |
567 | * @cmd: the command |
568 | * @arg: command arg | |
569 | * | |
570 | * This ioctl implements lttng commands: | |
38d024ae | 571 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 572 | * Returns a LTTng channel file descriptor |
e64957da MD |
573 | * LTTNG_KERNEL_ENABLE |
574 | * Enables tracing for a session (weak enable) | |
575 | * LTTNG_KERNEL_DISABLE | |
576 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
577 | * LTTNG_KERNEL_METADATA |
578 | * Returns a LTTng metadata file descriptor | |
e0130fab | 579 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 580 | * Add PID to session PID tracker |
e0130fab | 581 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
582 | * Remove PID from session PID tracker |
583 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
584 | * Add ID to tracker | |
585 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
586 | * Remove ID from tracker | |
ad1c05e1 MD |
587 | * |
588 | * The returned channel will be deleted when its file descriptor is closed. | |
589 | */ | |
590 | static | |
c0e31d2e | 591 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 592 | { |
a90917c3 | 593 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
594 | struct lttng_kernel_channel chan_param; |
595 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 596 | |
ad1c05e1 | 597 | switch (cmd) { |
6dccd6c1 JD |
598 | case LTTNG_KERNEL_OLD_CHANNEL: |
599 | { | |
6dccd6c1 JD |
600 | if (copy_from_user(&old_chan_param, |
601 | (struct lttng_kernel_old_channel __user *) arg, | |
602 | sizeof(struct lttng_kernel_old_channel))) | |
603 | return -EFAULT; | |
604 | chan_param.overwrite = old_chan_param.overwrite; | |
605 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
606 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
607 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
608 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
609 | chan_param.output = old_chan_param.output; | |
610 | ||
611 | return lttng_abi_create_channel(file, &chan_param, | |
612 | PER_CPU_CHANNEL); | |
613 | } | |
38d024ae | 614 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 615 | { |
6dccd6c1 | 616 | if (copy_from_user(&chan_param, |
38d024ae | 617 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
618 | sizeof(struct lttng_kernel_channel))) |
619 | return -EFAULT; | |
620 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 621 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
622 | } |
623 | case LTTNG_KERNEL_OLD_SESSION_START: | |
624 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 625 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 626 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 627 | return lttng_session_enable(session); |
6dccd6c1 JD |
628 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
629 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 630 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 631 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 632 | return lttng_session_disable(session); |
6dccd6c1 JD |
633 | case LTTNG_KERNEL_OLD_METADATA: |
634 | { | |
6dccd6c1 JD |
635 | if (copy_from_user(&old_chan_param, |
636 | (struct lttng_kernel_old_channel __user *) arg, | |
637 | sizeof(struct lttng_kernel_old_channel))) | |
638 | return -EFAULT; | |
639 | chan_param.overwrite = old_chan_param.overwrite; | |
640 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
641 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
642 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
643 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
644 | chan_param.output = old_chan_param.output; | |
645 | ||
646 | return lttng_abi_create_channel(file, &chan_param, | |
647 | METADATA_CHANNEL); | |
648 | } | |
38d024ae | 649 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 650 | { |
6dccd6c1 JD |
651 | if (copy_from_user(&chan_param, |
652 | (struct lttng_kernel_channel __user *) arg, | |
653 | sizeof(struct lttng_kernel_channel))) | |
654 | return -EFAULT; | |
655 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 656 | METADATA_CHANNEL); |
6dccd6c1 | 657 | } |
e0130fab | 658 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 659 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 660 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
661 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
662 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
663 | { | |
664 | struct lttng_kernel_tracker_args tracker; | |
665 | enum tracker_type tracker_type; | |
666 | ||
667 | if (copy_from_user(&tracker, | |
668 | (struct lttng_kernel_tracker_args __user *) arg, | |
669 | sizeof(struct lttng_kernel_tracker_args))) | |
670 | return -EFAULT; | |
671 | tracker_type = get_tracker_type(&tracker); | |
672 | if (tracker_type == TRACKER_UNKNOWN) | |
673 | return -EINVAL; | |
674 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
675 | } | |
676 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
677 | { | |
678 | struct lttng_kernel_tracker_args tracker; | |
679 | enum tracker_type tracker_type; | |
680 | ||
681 | if (copy_from_user(&tracker, | |
682 | (struct lttng_kernel_tracker_args __user *) arg, | |
683 | sizeof(struct lttng_kernel_tracker_args))) | |
684 | return -EFAULT; | |
685 | tracker_type = get_tracker_type(&tracker); | |
686 | if (tracker_type == TRACKER_UNKNOWN) | |
687 | return -EINVAL; | |
688 | return lttng_session_untrack_id(session, tracker_type, | |
689 | tracker.id); | |
690 | } | |
7e6f9ef6 | 691 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
692 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
693 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
694 | { | |
695 | struct lttng_kernel_tracker_args tracker; | |
696 | enum tracker_type tracker_type; | |
697 | ||
698 | if (copy_from_user(&tracker, | |
699 | (struct lttng_kernel_tracker_args __user *) arg, | |
700 | sizeof(struct lttng_kernel_tracker_args))) | |
701 | return -EFAULT; | |
702 | tracker_type = get_tracker_type(&tracker); | |
703 | if (tracker_type == TRACKER_UNKNOWN) | |
704 | return -EINVAL; | |
705 | return lttng_session_list_tracker_ids(session, tracker_type); | |
706 | } | |
9616f0bf JD |
707 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
708 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
709 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
710 | return lttng_session_statedump(session); | |
7f859fbf JR |
711 | case LTTNG_KERNEL_SESSION_SET_NAME: |
712 | { | |
713 | struct lttng_kernel_session_name name; | |
714 | ||
715 | if (copy_from_user(&name, | |
716 | (struct lttng_kernel_session_name __user *) arg, | |
717 | sizeof(struct lttng_kernel_session_name))) | |
718 | return -EFAULT; | |
719 | return lttng_abi_session_set_name(session, &name); | |
720 | } | |
1c88f269 JR |
721 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
722 | { | |
723 | struct lttng_kernel_session_creation_time time; | |
724 | ||
725 | if (copy_from_user(&time, | |
726 | (struct lttng_kernel_session_creation_time __user *) arg, | |
727 | sizeof(struct lttng_kernel_session_creation_time))) | |
728 | return -EFAULT; | |
729 | return lttng_abi_session_set_creation_time(session, &time); | |
730 | } | |
ad1c05e1 MD |
731 | default: |
732 | return -ENOIOCTLCMD; | |
733 | } | |
734 | } | |
735 | ||
03037b98 MD |
736 | /* |
737 | * Called when the last file reference is dropped. | |
738 | * | |
739 | * Big fat note: channels and events are invariant for the whole session after | |
740 | * their creation. So this session destruction also destroys all channel and | |
741 | * event structures specific to this session (they are not destroyed when their | |
742 | * individual file is released). | |
743 | */ | |
ad1c05e1 | 744 | static |
03037b98 | 745 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 746 | { |
a90917c3 | 747 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
748 | |
749 | if (session) | |
a90917c3 | 750 | lttng_session_destroy(session); |
11b5a3c2 | 751 | return 0; |
ad1c05e1 | 752 | } |
ad1c05e1 MD |
753 | |
754 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 755 | .owner = THIS_MODULE, |
03037b98 | 756 | .release = lttng_session_release, |
ad1c05e1 MD |
757 | .unlocked_ioctl = lttng_session_ioctl, |
758 | #ifdef CONFIG_COMPAT | |
03037b98 | 759 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 760 | #endif |
11b5a3c2 | 761 | }; |
ad1c05e1 | 762 | |
d83004aa JD |
763 | /** |
764 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
765 | * @filp: the file | |
766 | * @wait: poll table | |
767 | * | |
768 | * Handles the poll operations for the metadata channels. | |
769 | */ | |
ad1c05e1 | 770 | static |
d83004aa JD |
771 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
772 | poll_table *wait) | |
773 | { | |
774 | struct lttng_metadata_stream *stream = filp->private_data; | |
775 | struct lib_ring_buffer *buf = stream->priv; | |
776 | int finalized; | |
777 | unsigned int mask = 0; | |
778 | ||
779 | if (filp->f_mode & FMODE_READ) { | |
780 | poll_wait_set_exclusive(wait); | |
781 | poll_wait(filp, &stream->read_wait, wait); | |
782 | ||
783 | finalized = stream->finalized; | |
784 | ||
785 | /* | |
786 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
787 | * ordering finalized load before offsets loads. | |
788 | */ | |
789 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
790 | ||
791 | if (finalized) | |
792 | mask |= POLLHUP; | |
793 | ||
92d9f5e6 | 794 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 795 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 796 | stream->metadata_out) |
d83004aa | 797 | mask |= POLLIN; |
92d9f5e6 | 798 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
799 | } |
800 | ||
801 | return mask; | |
802 | } | |
803 | ||
f613e3e6 MD |
804 | static |
805 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
806 | unsigned int cmd, unsigned long arg) | |
807 | { | |
808 | struct lttng_metadata_stream *stream = filp->private_data; | |
809 | ||
810 | stream->metadata_out = stream->metadata_in; | |
811 | } | |
812 | ||
d1344afa JD |
813 | /* |
814 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
815 | * the consumer receives the content of the metadata cache unchanged. This is | |
816 | * different from the metadata_regenerate where the offset from epoch is | |
817 | * resampled, here we want the exact same content as the last time the metadata | |
818 | * was generated. This command is only possible if all the metadata written | |
819 | * in the cache has been output to the metadata stream to avoid corrupting the | |
820 | * metadata file. | |
821 | * | |
822 | * Return 0 on success, a negative value on error. | |
823 | */ | |
824 | static | |
825 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
826 | { | |
827 | int ret; | |
828 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
829 | ||
830 | mutex_lock(&cache->lock); | |
831 | if (stream->metadata_out != cache->metadata_written) { | |
832 | ret = -EBUSY; | |
833 | goto end; | |
834 | } | |
835 | stream->metadata_out = 0; | |
836 | stream->metadata_in = 0; | |
837 | wake_up_interruptible(&stream->read_wait); | |
838 | ret = 0; | |
839 | ||
840 | end: | |
841 | mutex_unlock(&cache->lock); | |
842 | return ret; | |
843 | } | |
844 | ||
d83004aa JD |
845 | static |
846 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
847 | unsigned int cmd, unsigned long arg) | |
848 | { | |
849 | int ret; | |
850 | struct lttng_metadata_stream *stream = filp->private_data; | |
851 | struct lib_ring_buffer *buf = stream->priv; | |
852 | ||
853 | switch (cmd) { | |
d83004aa JD |
854 | case RING_BUFFER_GET_NEXT_SUBBUF: |
855 | { | |
35097f36 JD |
856 | struct lttng_metadata_stream *stream = filp->private_data; |
857 | struct lib_ring_buffer *buf = stream->priv; | |
858 | struct channel *chan = buf->backend.chan; | |
859 | ||
860 | ret = lttng_metadata_output_channel(stream, chan); | |
861 | if (ret > 0) { | |
862 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
863 | ret = 0; | |
864 | } else if (ret < 0) | |
d83004aa JD |
865 | goto err; |
866 | break; | |
867 | } | |
f613e3e6 MD |
868 | case RING_BUFFER_GET_SUBBUF: |
869 | { | |
870 | /* | |
871 | * Random access is not allowed for metadata channel. | |
872 | */ | |
873 | return -ENOSYS; | |
874 | } | |
c6f05468 | 875 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
876 | case RING_BUFFER_FLUSH: |
877 | { | |
878 | struct lttng_metadata_stream *stream = filp->private_data; | |
879 | struct lib_ring_buffer *buf = stream->priv; | |
880 | struct channel *chan = buf->backend.chan; | |
881 | ||
882 | /* | |
883 | * Before doing the actual ring buffer flush, write up to one | |
884 | * packet of metadata in the ring buffer. | |
885 | */ | |
886 | ret = lttng_metadata_output_channel(stream, chan); | |
887 | if (ret < 0) | |
888 | goto err; | |
889 | break; | |
890 | } | |
9616f0bf JD |
891 | case RING_BUFFER_GET_METADATA_VERSION: |
892 | { | |
893 | struct lttng_metadata_stream *stream = filp->private_data; | |
894 | ||
895 | return put_u64(stream->version, arg); | |
896 | } | |
d1344afa JD |
897 | case RING_BUFFER_METADATA_CACHE_DUMP: |
898 | { | |
899 | struct lttng_metadata_stream *stream = filp->private_data; | |
900 | ||
901 | return lttng_metadata_cache_dump(stream); | |
902 | } | |
d83004aa JD |
903 | default: |
904 | break; | |
905 | } | |
f613e3e6 MD |
906 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
907 | ||
d83004aa | 908 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
909 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
910 | if (ret < 0) | |
911 | goto err; | |
d83004aa | 912 | |
f613e3e6 MD |
913 | switch (cmd) { |
914 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
915 | { | |
916 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
917 | cmd, arg); | |
918 | break; | |
919 | } | |
920 | default: | |
921 | break; | |
922 | } | |
d83004aa JD |
923 | err: |
924 | return ret; | |
925 | } | |
926 | ||
aeb9064d | 927 | #ifdef CONFIG_COMPAT |
d83004aa JD |
928 | static |
929 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
930 | unsigned int cmd, unsigned long arg) | |
931 | { | |
932 | int ret; | |
933 | struct lttng_metadata_stream *stream = filp->private_data; | |
934 | struct lib_ring_buffer *buf = stream->priv; | |
935 | ||
936 | switch (cmd) { | |
d83004aa JD |
937 | case RING_BUFFER_GET_NEXT_SUBBUF: |
938 | { | |
35097f36 JD |
939 | struct lttng_metadata_stream *stream = filp->private_data; |
940 | struct lib_ring_buffer *buf = stream->priv; | |
941 | struct channel *chan = buf->backend.chan; | |
942 | ||
943 | ret = lttng_metadata_output_channel(stream, chan); | |
944 | if (ret > 0) { | |
945 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
946 | ret = 0; | |
947 | } else if (ret < 0) | |
d83004aa JD |
948 | goto err; |
949 | break; | |
950 | } | |
f613e3e6 MD |
951 | case RING_BUFFER_GET_SUBBUF: |
952 | { | |
953 | /* | |
954 | * Random access is not allowed for metadata channel. | |
955 | */ | |
956 | return -ENOSYS; | |
957 | } | |
c6f05468 | 958 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
959 | case RING_BUFFER_FLUSH: |
960 | { | |
961 | struct lttng_metadata_stream *stream = filp->private_data; | |
962 | struct lib_ring_buffer *buf = stream->priv; | |
963 | struct channel *chan = buf->backend.chan; | |
964 | ||
965 | /* | |
966 | * Before doing the actual ring buffer flush, write up to one | |
967 | * packet of metadata in the ring buffer. | |
968 | */ | |
969 | ret = lttng_metadata_output_channel(stream, chan); | |
970 | if (ret < 0) | |
971 | goto err; | |
972 | break; | |
973 | } | |
974 | case RING_BUFFER_GET_METADATA_VERSION: | |
975 | { | |
976 | struct lttng_metadata_stream *stream = filp->private_data; | |
977 | ||
978 | return put_u64(stream->version, arg); | |
979 | } | |
d1344afa JD |
980 | case RING_BUFFER_METADATA_CACHE_DUMP: |
981 | { | |
982 | struct lttng_metadata_stream *stream = filp->private_data; | |
983 | ||
984 | return lttng_metadata_cache_dump(stream); | |
985 | } | |
d83004aa JD |
986 | default: |
987 | break; | |
988 | } | |
f613e3e6 MD |
989 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
990 | ||
d83004aa | 991 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
992 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
993 | if (ret < 0) | |
994 | goto err; | |
d83004aa | 995 | |
f613e3e6 MD |
996 | switch (cmd) { |
997 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
998 | { | |
999 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1000 | cmd, arg); | |
1001 | break; | |
1002 | } | |
1003 | default: | |
1004 | break; | |
1005 | } | |
d83004aa JD |
1006 | err: |
1007 | return ret; | |
1008 | } | |
aeb9064d | 1009 | #endif |
d83004aa | 1010 | |
b3b8072b MD |
1011 | /* |
1012 | * This is not used by anonymous file descriptors. This code is left | |
1013 | * there if we ever want to implement an inode with open() operation. | |
1014 | */ | |
d83004aa JD |
1015 | static |
1016 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1017 | { | |
1018 | struct lttng_metadata_stream *stream = inode->i_private; | |
1019 | struct lib_ring_buffer *buf = stream->priv; | |
1020 | ||
1021 | file->private_data = buf; | |
b3b8072b MD |
1022 | /* |
1023 | * Since life-time of metadata cache differs from that of | |
1024 | * session, we need to keep our own reference on the transport. | |
1025 | */ | |
1026 | if (!try_module_get(stream->transport->owner)) { | |
1027 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1028 | return -EBUSY; | |
1029 | } | |
d83004aa JD |
1030 | return lib_ring_buffer_open(inode, file, buf); |
1031 | } | |
1032 | ||
1033 | static | |
1034 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1035 | { | |
1036 | struct lttng_metadata_stream *stream = file->private_data; | |
1037 | struct lib_ring_buffer *buf = stream->priv; | |
1038 | ||
1039 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 1040 | module_put(stream->transport->owner); |
d83004aa JD |
1041 | return lib_ring_buffer_release(inode, file, buf); |
1042 | } | |
1043 | ||
1044 | static | |
1045 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1046 | struct pipe_inode_info *pipe, size_t len, | |
1047 | unsigned int flags) | |
1048 | { | |
1049 | struct lttng_metadata_stream *stream = in->private_data; | |
1050 | struct lib_ring_buffer *buf = stream->priv; | |
1051 | ||
1052 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1053 | flags, buf); | |
1054 | } | |
1055 | ||
1056 | static | |
1057 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1058 | struct vm_area_struct *vma) | |
1059 | { | |
1060 | struct lttng_metadata_stream *stream = filp->private_data; | |
1061 | struct lib_ring_buffer *buf = stream->priv; | |
1062 | ||
1063 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1064 | } | |
1065 | ||
1066 | static | |
1067 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1068 | .owner = THIS_MODULE, | |
1069 | .open = lttng_metadata_ring_buffer_open, | |
1070 | .release = lttng_metadata_ring_buffer_release, | |
1071 | .poll = lttng_metadata_ring_buffer_poll, | |
1072 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1073 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1074 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1075 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1076 | #ifdef CONFIG_COMPAT | |
1077 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1078 | #endif | |
1079 | }; | |
1080 | ||
1081 | static | |
1082 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
1083 | const struct file_operations *fops) | |
ad1c05e1 | 1084 | { |
ad1c05e1 | 1085 | int stream_fd, ret; |
11b5a3c2 | 1086 | struct file *stream_file; |
ad1c05e1 | 1087 | |
4ac10b76 | 1088 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1089 | if (stream_fd < 0) { |
1090 | ret = stream_fd; | |
1091 | goto fd_error; | |
1092 | } | |
d83004aa JD |
1093 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
1094 | stream_priv, O_RDWR); | |
c0e31d2e MD |
1095 | if (IS_ERR(stream_file)) { |
1096 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1097 | goto file_error; |
1098 | } | |
409453cb MD |
1099 | /* |
1100 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1101 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1102 | * file descriptor, so we set FMODE_PREAD here. | |
1103 | */ | |
d7b6f197 | 1104 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1105 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1106 | /* |
1107 | * The stream holds a reference to the channel within the generic ring | |
1108 | * buffer library, so no need to hold a refcount on the channel and | |
1109 | * session files here. | |
1110 | */ | |
ad1c05e1 MD |
1111 | return stream_fd; |
1112 | ||
1113 | file_error: | |
1114 | put_unused_fd(stream_fd); | |
d83004aa JD |
1115 | fd_error: |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | static | |
1120 | int lttng_abi_open_stream(struct file *channel_file) | |
1121 | { | |
1122 | struct lttng_channel *channel = channel_file->private_data; | |
1123 | struct lib_ring_buffer *buf; | |
1124 | int ret; | |
1125 | void *stream_priv; | |
1126 | ||
1127 | buf = channel->ops->buffer_read_open(channel->chan); | |
1128 | if (!buf) | |
1129 | return -ENOENT; | |
1130 | ||
1131 | stream_priv = buf; | |
1132 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 1133 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
1134 | if (ret < 0) |
1135 | goto fd_error; | |
1136 | ||
1137 | return ret; | |
1138 | ||
1139 | fd_error: | |
1140 | channel->ops->buffer_read_close(buf); | |
1141 | return ret; | |
1142 | } | |
1143 | ||
1144 | static | |
1145 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1146 | { | |
1147 | struct lttng_channel *channel = channel_file->private_data; | |
1148 | struct lttng_session *session = channel->session; | |
1149 | struct lib_ring_buffer *buf; | |
1150 | int ret; | |
1151 | struct lttng_metadata_stream *metadata_stream; | |
1152 | void *stream_priv; | |
1153 | ||
1154 | buf = channel->ops->buffer_read_open(channel->chan); | |
1155 | if (!buf) | |
1156 | return -ENOENT; | |
1157 | ||
1158 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1159 | GFP_KERNEL); | |
b3b8072b MD |
1160 | if (!metadata_stream) { |
1161 | ret = -ENOMEM; | |
1162 | goto nomem; | |
1163 | } | |
d83004aa JD |
1164 | metadata_stream->metadata_cache = session->metadata_cache; |
1165 | init_waitqueue_head(&metadata_stream->read_wait); | |
1166 | metadata_stream->priv = buf; | |
1167 | stream_priv = metadata_stream; | |
b3b8072b MD |
1168 | metadata_stream->transport = channel->transport; |
1169 | ||
1170 | /* | |
1171 | * Since life-time of metadata cache differs from that of | |
1172 | * session, we need to keep our own reference on the transport. | |
1173 | */ | |
1174 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1175 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1176 | ret = -EINVAL; | |
1177 | goto notransport; | |
1178 | } | |
1179 | ||
901aaa5f FD |
1180 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1181 | ret = -EOVERFLOW; | |
9c1f4643 | 1182 | goto kref_error; |
901aaa5f FD |
1183 | } |
1184 | ||
d83004aa JD |
1185 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
1186 | <tng_metadata_ring_buffer_file_operations); | |
1187 | if (ret < 0) | |
1188 | goto fd_error; | |
1189 | ||
d83004aa JD |
1190 | list_add(&metadata_stream->list, |
1191 | &session->metadata_cache->metadata_stream); | |
1192 | return ret; | |
1193 | ||
ad1c05e1 | 1194 | fd_error: |
9c1f4643 MD |
1195 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1196 | kref_error: | |
b3b8072b MD |
1197 | module_put(metadata_stream->transport->owner); |
1198 | notransport: | |
1199 | kfree(metadata_stream); | |
1200 | nomem: | |
11b5a3c2 | 1201 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1202 | return ret; |
1203 | } | |
1204 | ||
653fe716 | 1205 | static |
c0e31d2e | 1206 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1207 | struct lttng_kernel_event *event_param) |
653fe716 | 1208 | { |
a90917c3 | 1209 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1210 | int event_fd, ret; |
11b5a3c2 | 1211 | struct file *event_file; |
3c997079 | 1212 | void *priv; |
653fe716 | 1213 | |
6dccd6c1 JD |
1214 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1215 | switch (event_param->instrumentation) { | |
7371f44c | 1216 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1217 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1218 | break; |
ab2277d6 | 1219 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1220 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1221 | break; |
ab2277d6 | 1222 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1223 | WARN_ON_ONCE(1); |
1224 | /* Not implemented. */ | |
e0a7a7c4 MD |
1225 | break; |
1226 | default: | |
1227 | break; | |
1228 | } | |
33a39a3c MD |
1229 | event_fd = lttng_get_unused_fd(); |
1230 | if (event_fd < 0) { | |
1231 | ret = event_fd; | |
1232 | goto fd_error; | |
1233 | } | |
1234 | event_file = anon_inode_getfile("[lttng_event]", | |
1235 | <tng_event_fops, | |
1236 | NULL, O_RDWR); | |
1237 | if (IS_ERR(event_file)) { | |
1238 | ret = PTR_ERR(event_file); | |
1239 | goto file_error; | |
1240 | } | |
9c1f4643 | 1241 | /* The event holds a reference on the channel */ |
98d7281c | 1242 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1243 | ret = -EOVERFLOW; |
9c1f4643 MD |
1244 | goto refcount_error; |
1245 | } | |
33a39a3c MD |
1246 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1247 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1248 | struct lttng_enabler *enabler; | |
1249 | ||
4993071a PP |
1250 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1251 | /* | |
1252 | * If the event name is a star globbing pattern, | |
1253 | * we create the special star globbing enabler. | |
1254 | */ | |
1255 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, | |
33a39a3c | 1256 | event_param, channel); |
3c997079 | 1257 | } else { |
33a39a3c MD |
1258 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1259 | event_param, channel); | |
1ec65de1 | 1260 | } |
33a39a3c MD |
1261 | priv = enabler; |
1262 | } else { | |
1263 | struct lttng_event *event; | |
4ee2453d | 1264 | |
33a39a3c MD |
1265 | /* |
1266 | * We tolerate no failure path after event creation. It | |
1267 | * will stay invariant for the rest of the session. | |
1268 | */ | |
1269 | event = lttng_event_create(channel, event_param, | |
1270 | NULL, NULL, | |
1271 | event_param->instrumentation); | |
1272 | WARN_ON_ONCE(!event); | |
1273 | if (IS_ERR(event)) { | |
1274 | ret = PTR_ERR(event); | |
1275 | goto event_error; | |
80f87dd2 | 1276 | } |
33a39a3c | 1277 | priv = event; |
03037b98 | 1278 | } |
33a39a3c MD |
1279 | event_file->private_data = priv; |
1280 | fd_install(event_fd, event_file); | |
653fe716 MD |
1281 | return event_fd; |
1282 | ||
03037b98 | 1283 | event_error: |
9c1f4643 MD |
1284 | atomic_long_dec(&channel_file->f_count); |
1285 | refcount_error: | |
c0e31d2e | 1286 | fput(event_file); |
653fe716 MD |
1287 | file_error: |
1288 | put_unused_fd(event_fd); | |
1289 | fd_error: | |
653fe716 MD |
1290 | return ret; |
1291 | } | |
ad1c05e1 MD |
1292 | |
1293 | /** | |
1294 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1295 | * | |
c0e31d2e | 1296 | * @file: the file |
ad1c05e1 MD |
1297 | * @cmd: the command |
1298 | * @arg: command arg | |
1299 | * | |
1300 | * This ioctl implements lttng commands: | |
38d024ae | 1301 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1302 | * Returns an event stream file descriptor or failure. |
1303 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1304 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1305 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1306 | * LTTNG_KERNEL_CONTEXT |
1307 | * Prepend a context field to each event in the channel | |
e64957da MD |
1308 | * LTTNG_KERNEL_ENABLE |
1309 | * Enable recording for events in this channel (weak enable) | |
1310 | * LTTNG_KERNEL_DISABLE | |
1311 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1312 | * |
baf20995 MD |
1313 | * Channel and event file descriptors also hold a reference on the session. |
1314 | */ | |
ad1c05e1 | 1315 | static |
c0e31d2e | 1316 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1317 | { |
a90917c3 | 1318 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1319 | |
baf20995 | 1320 | switch (cmd) { |
6dccd6c1 | 1321 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1322 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1323 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1324 | case LTTNG_KERNEL_OLD_EVENT: |
1325 | { | |
1326 | struct lttng_kernel_event *uevent_param; | |
1327 | struct lttng_kernel_old_event *old_uevent_param; | |
1328 | int ret; | |
1329 | ||
1330 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1331 | GFP_KERNEL); | |
1332 | if (!uevent_param) { | |
1333 | ret = -ENOMEM; | |
1334 | goto old_event_end; | |
1335 | } | |
1336 | old_uevent_param = kmalloc( | |
1337 | sizeof(struct lttng_kernel_old_event), | |
1338 | GFP_KERNEL); | |
1339 | if (!old_uevent_param) { | |
1340 | ret = -ENOMEM; | |
1341 | goto old_event_error_free_param; | |
1342 | } | |
1343 | if (copy_from_user(old_uevent_param, | |
1344 | (struct lttng_kernel_old_event __user *) arg, | |
1345 | sizeof(struct lttng_kernel_old_event))) { | |
1346 | ret = -EFAULT; | |
1347 | goto old_event_error_free_old_param; | |
1348 | } | |
1349 | ||
1350 | memcpy(uevent_param->name, old_uevent_param->name, | |
1351 | sizeof(uevent_param->name)); | |
1352 | uevent_param->instrumentation = | |
1353 | old_uevent_param->instrumentation; | |
1354 | ||
1355 | switch (old_uevent_param->instrumentation) { | |
1356 | case LTTNG_KERNEL_KPROBE: | |
1357 | uevent_param->u.kprobe.addr = | |
1358 | old_uevent_param->u.kprobe.addr; | |
1359 | uevent_param->u.kprobe.offset = | |
1360 | old_uevent_param->u.kprobe.offset; | |
1361 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1362 | old_uevent_param->u.kprobe.symbol_name, | |
1363 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1364 | break; | |
1365 | case LTTNG_KERNEL_KRETPROBE: | |
1366 | uevent_param->u.kretprobe.addr = | |
1367 | old_uevent_param->u.kretprobe.addr; | |
1368 | uevent_param->u.kretprobe.offset = | |
1369 | old_uevent_param->u.kretprobe.offset; | |
1370 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1371 | old_uevent_param->u.kretprobe.symbol_name, | |
1372 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1373 | break; | |
1374 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
1375 | WARN_ON_ONCE(1); |
1376 | /* Not implemented. */ | |
6dccd6c1 JD |
1377 | break; |
1378 | default: | |
1379 | break; | |
1380 | } | |
1381 | ret = lttng_abi_create_event(file, uevent_param); | |
1382 | ||
1383 | old_event_error_free_old_param: | |
1384 | kfree(old_uevent_param); | |
1385 | old_event_error_free_param: | |
1386 | kfree(uevent_param); | |
1387 | old_event_end: | |
1388 | return ret; | |
1389 | } | |
38d024ae | 1390 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1391 | { |
1392 | struct lttng_kernel_event uevent_param; | |
1393 | ||
1394 | if (copy_from_user(&uevent_param, | |
1395 | (struct lttng_kernel_event __user *) arg, | |
1396 | sizeof(uevent_param))) | |
1397 | return -EFAULT; | |
1398 | return lttng_abi_create_event(file, &uevent_param); | |
1399 | } | |
1400 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1401 | { | |
1402 | struct lttng_kernel_context *ucontext_param; | |
1403 | struct lttng_kernel_old_context *old_ucontext_param; | |
1404 | int ret; | |
1405 | ||
1406 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1407 | GFP_KERNEL); | |
1408 | if (!ucontext_param) { | |
1409 | ret = -ENOMEM; | |
1410 | goto old_ctx_end; | |
1411 | } | |
1412 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1413 | GFP_KERNEL); | |
1414 | if (!old_ucontext_param) { | |
1415 | ret = -ENOMEM; | |
1416 | goto old_ctx_error_free_param; | |
1417 | } | |
1418 | ||
1419 | if (copy_from_user(old_ucontext_param, | |
1420 | (struct lttng_kernel_old_context __user *) arg, | |
1421 | sizeof(struct lttng_kernel_old_context))) { | |
1422 | ret = -EFAULT; | |
1423 | goto old_ctx_error_free_old_param; | |
1424 | } | |
1425 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1426 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1427 | sizeof(ucontext_param->padding)); | |
1428 | /* only type that uses the union */ | |
1429 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1430 | ucontext_param->u.perf_counter.type = | |
1431 | old_ucontext_param->u.perf_counter.type; | |
1432 | ucontext_param->u.perf_counter.config = | |
1433 | old_ucontext_param->u.perf_counter.config; | |
1434 | memcpy(ucontext_param->u.perf_counter.name, | |
1435 | old_ucontext_param->u.perf_counter.name, | |
1436 | sizeof(ucontext_param->u.perf_counter.name)); | |
1437 | } | |
1438 | ||
1439 | ret = lttng_abi_add_context(file, | |
1440 | ucontext_param, | |
1441 | &channel->ctx, channel->session); | |
1442 | ||
1443 | old_ctx_error_free_old_param: | |
1444 | kfree(old_ucontext_param); | |
1445 | old_ctx_error_free_param: | |
1446 | kfree(ucontext_param); | |
1447 | old_ctx_end: | |
1448 | return ret; | |
1449 | } | |
8070f5c0 | 1450 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1451 | { |
1452 | struct lttng_kernel_context ucontext_param; | |
1453 | ||
1454 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1455 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1456 | sizeof(ucontext_param))) |
1457 | return -EFAULT; | |
1458 | return lttng_abi_add_context(file, | |
1459 | &ucontext_param, | |
8070f5c0 | 1460 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1461 | } |
1462 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1463 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1464 | return lttng_channel_enable(channel); |
6dccd6c1 | 1465 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1466 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1467 | return lttng_channel_disable(channel); |
12e579db MD |
1468 | case LTTNG_KERNEL_SYSCALL_MASK: |
1469 | return lttng_channel_syscall_mask(channel, | |
1470 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1471 | default: |
1472 | return -ENOIOCTLCMD; | |
1473 | } | |
1474 | } | |
1475 | ||
5dbbdb43 MD |
1476 | /** |
1477 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1478 | * | |
1479 | * @file: the file | |
1480 | * @cmd: the command | |
1481 | * @arg: command arg | |
1482 | * | |
1483 | * This ioctl implements lttng commands: | |
38d024ae | 1484 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1485 | * Returns an event stream file descriptor or failure. |
1486 | * | |
1487 | * Channel and event file descriptors also hold a reference on the session. | |
1488 | */ | |
1489 | static | |
1490 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1491 | { | |
1492 | switch (cmd) { | |
6dccd6c1 | 1493 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1494 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1495 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1496 | default: |
1497 | return -ENOIOCTLCMD; | |
1498 | } | |
1499 | } | |
1500 | ||
653fe716 MD |
1501 | /** |
1502 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1503 | * | |
c0e31d2e | 1504 | * @file: the file |
653fe716 MD |
1505 | * @wait: poll table |
1506 | */ | |
c0e31d2e | 1507 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1508 | { |
a90917c3 | 1509 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1510 | unsigned int mask = 0; |
1511 | ||
c0e31d2e | 1512 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1513 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1514 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1515 | wait); | |
653fe716 | 1516 | |
254ec7bc MD |
1517 | if (channel->ops->is_disabled(channel->chan)) |
1518 | return POLLERR; | |
24cedcfe | 1519 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1520 | return POLLHUP; |
f71ecafa | 1521 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1522 | return POLLIN | POLLRDNORM; |
f71ecafa | 1523 | return 0; |
653fe716 MD |
1524 | } |
1525 | return mask; | |
1526 | ||
1527 | } | |
1528 | ||
0a84a57f MD |
1529 | static |
1530 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1531 | { | |
a90917c3 | 1532 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1533 | |
1534 | if (channel) | |
1535 | fput(channel->session->file); | |
0a84a57f MD |
1536 | return 0; |
1537 | } | |
1538 | ||
d83004aa JD |
1539 | static |
1540 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1541 | { | |
1542 | struct lttng_channel *channel = file->private_data; | |
1543 | ||
1544 | if (channel) { | |
d83004aa | 1545 | fput(channel->session->file); |
a3381417 | 1546 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1547 | } |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | ||
ad1c05e1 | 1552 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1553 | .owner = THIS_MODULE, |
03037b98 | 1554 | .release = lttng_channel_release, |
653fe716 | 1555 | .poll = lttng_channel_poll, |
ad1c05e1 | 1556 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1557 | #ifdef CONFIG_COMPAT |
03037b98 | 1558 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1559 | #endif |
11b5a3c2 | 1560 | }; |
baf20995 | 1561 | |
5dbbdb43 | 1562 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1563 | .owner = THIS_MODULE, |
d83004aa | 1564 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1565 | .unlocked_ioctl = lttng_metadata_ioctl, |
1566 | #ifdef CONFIG_COMPAT | |
1567 | .compat_ioctl = lttng_metadata_ioctl, | |
1568 | #endif | |
1569 | }; | |
1570 | ||
8070f5c0 MD |
1571 | /** |
1572 | * lttng_event_ioctl - lttng syscall through ioctl | |
1573 | * | |
1574 | * @file: the file | |
1575 | * @cmd: the command | |
1576 | * @arg: command arg | |
1577 | * | |
1578 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1579 | * LTTNG_KERNEL_CONTEXT |
1580 | * Prepend a context field to each record of this event | |
e64957da MD |
1581 | * LTTNG_KERNEL_ENABLE |
1582 | * Enable recording for this event (weak enable) | |
1583 | * LTTNG_KERNEL_DISABLE | |
1584 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1585 | */ |
1586 | static | |
1587 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1588 | { | |
3c997079 MD |
1589 | struct lttng_event *event; |
1590 | struct lttng_enabler *enabler; | |
1591 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1592 | |
1593 | switch (cmd) { | |
6dccd6c1 JD |
1594 | case LTTNG_KERNEL_OLD_CONTEXT: |
1595 | { | |
3c997079 MD |
1596 | /* Not implemented */ |
1597 | return -ENOSYS; | |
6dccd6c1 | 1598 | } |
8070f5c0 | 1599 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1600 | { |
3c997079 MD |
1601 | /* Not implemented */ |
1602 | return -ENOSYS; | |
6dccd6c1 JD |
1603 | } |
1604 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1605 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1606 | switch (*evtype) { |
1607 | case LTTNG_TYPE_EVENT: | |
1608 | event = file->private_data; | |
1609 | return lttng_event_enable(event); | |
1610 | case LTTNG_TYPE_ENABLER: | |
1611 | enabler = file->private_data; | |
1612 | return lttng_enabler_enable(enabler); | |
1613 | default: | |
1614 | WARN_ON_ONCE(1); | |
1615 | return -ENOSYS; | |
1616 | } | |
6dccd6c1 | 1617 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1618 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1619 | switch (*evtype) { |
1620 | case LTTNG_TYPE_EVENT: | |
1621 | event = file->private_data; | |
1622 | return lttng_event_disable(event); | |
1623 | case LTTNG_TYPE_ENABLER: | |
1624 | enabler = file->private_data; | |
1625 | return lttng_enabler_disable(enabler); | |
1626 | default: | |
1627 | WARN_ON_ONCE(1); | |
1628 | return -ENOSYS; | |
1629 | } | |
07dfc1d0 MD |
1630 | case LTTNG_KERNEL_FILTER: |
1631 | switch (*evtype) { | |
1632 | case LTTNG_TYPE_EVENT: | |
1633 | return -EINVAL; | |
1634 | case LTTNG_TYPE_ENABLER: | |
1635 | { | |
1636 | enabler = file->private_data; | |
1637 | return lttng_enabler_attach_bytecode(enabler, | |
1638 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1639 | } | |
0586316f MD |
1640 | default: |
1641 | WARN_ON_ONCE(1); | |
1642 | return -ENOSYS; | |
07dfc1d0 | 1643 | } |
3aed4dca FD |
1644 | case LTTNG_KERNEL_ADD_CALLSITE: |
1645 | switch (*evtype) { | |
1646 | case LTTNG_TYPE_EVENT: | |
1647 | event = file->private_data; | |
1648 | return lttng_event_add_callsite(event, | |
1649 | (struct lttng_kernel_event_callsite __user *) arg); | |
1650 | case LTTNG_TYPE_ENABLER: | |
1651 | return -EINVAL; | |
64c147c0 MD |
1652 | default: |
1653 | WARN_ON_ONCE(1); | |
1654 | return -ENOSYS; | |
3aed4dca | 1655 | } |
8070f5c0 MD |
1656 | default: |
1657 | return -ENOIOCTLCMD; | |
1658 | } | |
1659 | } | |
1660 | ||
0a84a57f MD |
1661 | static |
1662 | int lttng_event_release(struct inode *inode, struct file *file) | |
1663 | { | |
3c997079 MD |
1664 | struct lttng_event *event; |
1665 | struct lttng_enabler *enabler; | |
1666 | enum lttng_event_type *evtype = file->private_data; | |
1667 | ||
1668 | if (!evtype) | |
1669 | return 0; | |
1670 | ||
1671 | switch (*evtype) { | |
1672 | case LTTNG_TYPE_EVENT: | |
1673 | event = file->private_data; | |
1674 | if (event) | |
1675 | fput(event->chan->file); | |
1676 | break; | |
1677 | case LTTNG_TYPE_ENABLER: | |
1678 | enabler = file->private_data; | |
1679 | if (enabler) | |
1680 | fput(enabler->chan->file); | |
1681 | break; | |
1682 | default: | |
1683 | WARN_ON_ONCE(1); | |
1684 | break; | |
1685 | } | |
c269fff4 | 1686 | |
0a84a57f MD |
1687 | return 0; |
1688 | } | |
1689 | ||
3b923e5b | 1690 | /* TODO: filter control ioctl */ |
0a84a57f | 1691 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1692 | .owner = THIS_MODULE, |
0a84a57f | 1693 | .release = lttng_event_release, |
8070f5c0 MD |
1694 | .unlocked_ioctl = lttng_event_ioctl, |
1695 | #ifdef CONFIG_COMPAT | |
1696 | .compat_ioctl = lttng_event_ioctl, | |
1697 | #endif | |
11b5a3c2 | 1698 | }; |
0a84a57f | 1699 | |
3b731ab1 JD |
1700 | static int put_u64(uint64_t val, unsigned long arg) |
1701 | { | |
1702 | return put_user(val, (uint64_t __user *) arg); | |
1703 | } | |
1704 | ||
ed8d02d6 JD |
1705 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1706 | unsigned int cmd, unsigned long arg) | |
1707 | { | |
3b731ab1 JD |
1708 | struct lib_ring_buffer *buf = filp->private_data; |
1709 | struct channel *chan = buf->backend.chan; | |
1710 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1711 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1712 | int ret; |
1713 | ||
1714 | if (atomic_read(&chan->record_disabled)) | |
1715 | return -EIO; | |
1716 | ||
ed8d02d6 | 1717 | switch (cmd) { |
3b731ab1 JD |
1718 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1719 | { | |
1720 | uint64_t ts; | |
1721 | ||
dd5a0db3 | 1722 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1723 | if (ret < 0) |
1724 | goto error; | |
1725 | return put_u64(ts, arg); | |
1726 | } | |
1727 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1728 | { | |
1729 | uint64_t ts; | |
1730 | ||
dd5a0db3 | 1731 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1732 | if (ret < 0) |
1733 | goto error; | |
1734 | return put_u64(ts, arg); | |
1735 | } | |
1736 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1737 | { | |
1738 | uint64_t ed; | |
1739 | ||
dd5a0db3 | 1740 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1741 | if (ret < 0) |
1742 | goto error; | |
1743 | return put_u64(ed, arg); | |
1744 | } | |
1745 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1746 | { | |
1747 | uint64_t cs; | |
1748 | ||
dd5a0db3 | 1749 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1750 | if (ret < 0) |
1751 | goto error; | |
1752 | return put_u64(cs, arg); | |
1753 | } | |
1754 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1755 | { | |
1756 | uint64_t ps; | |
1757 | ||
dd5a0db3 | 1758 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1759 | if (ret < 0) |
1760 | goto error; | |
1761 | return put_u64(ps, arg); | |
1762 | } | |
1763 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1764 | { | |
1765 | uint64_t si; | |
1766 | ||
dd5a0db3 | 1767 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1768 | if (ret < 0) |
1769 | goto error; | |
1770 | return put_u64(si, arg); | |
1771 | } | |
2348ca17 JD |
1772 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1773 | { | |
1774 | uint64_t ts; | |
1775 | ||
dd5a0db3 | 1776 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1777 | if (ret < 0) |
1778 | goto error; | |
1779 | return put_u64(ts, arg); | |
1780 | } | |
5b3cf4f9 JD |
1781 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1782 | { | |
1783 | uint64_t seq; | |
1784 | ||
1785 | ret = ops->sequence_number(config, buf, &seq); | |
1786 | if (ret < 0) | |
1787 | goto error; | |
1788 | return put_u64(seq, arg); | |
1789 | } | |
5594698f JD |
1790 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1791 | { | |
1792 | uint64_t id; | |
1793 | ||
1794 | ret = ops->instance_id(config, buf, &id); | |
1795 | if (ret < 0) | |
1796 | goto error; | |
1797 | return put_u64(id, arg); | |
1798 | } | |
3b731ab1 JD |
1799 | default: |
1800 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1801 | cmd, arg); | |
ed8d02d6 | 1802 | } |
3b731ab1 JD |
1803 | |
1804 | error: | |
1805 | return -ENOSYS; | |
ed8d02d6 JD |
1806 | } |
1807 | ||
1808 | #ifdef CONFIG_COMPAT | |
1809 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1810 | unsigned int cmd, unsigned long arg) | |
1811 | { | |
3b731ab1 JD |
1812 | struct lib_ring_buffer *buf = filp->private_data; |
1813 | struct channel *chan = buf->backend.chan; | |
1814 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1815 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1816 | int ret; |
1817 | ||
1818 | if (atomic_read(&chan->record_disabled)) | |
1819 | return -EIO; | |
1820 | ||
ed8d02d6 | 1821 | switch (cmd) { |
3b731ab1 JD |
1822 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1823 | { | |
1824 | uint64_t ts; | |
1825 | ||
dd5a0db3 | 1826 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1827 | if (ret < 0) |
1828 | goto error; | |
1829 | return put_u64(ts, arg); | |
1830 | } | |
1831 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1832 | { | |
1833 | uint64_t ts; | |
1834 | ||
dd5a0db3 | 1835 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1836 | if (ret < 0) |
1837 | goto error; | |
1838 | return put_u64(ts, arg); | |
1839 | } | |
1840 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1841 | { | |
1842 | uint64_t ed; | |
1843 | ||
dd5a0db3 | 1844 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1845 | if (ret < 0) |
1846 | goto error; | |
1847 | return put_u64(ed, arg); | |
ed8d02d6 | 1848 | } |
3b731ab1 JD |
1849 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1850 | { | |
1851 | uint64_t cs; | |
1852 | ||
dd5a0db3 | 1853 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1854 | if (ret < 0) |
1855 | goto error; | |
1856 | return put_u64(cs, arg); | |
1857 | } | |
1858 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1859 | { | |
1860 | uint64_t ps; | |
1861 | ||
dd5a0db3 | 1862 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1863 | if (ret < 0) |
1864 | goto error; | |
1865 | return put_u64(ps, arg); | |
1866 | } | |
1867 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1868 | { | |
1869 | uint64_t si; | |
1870 | ||
dd5a0db3 | 1871 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1872 | if (ret < 0) |
1873 | goto error; | |
1874 | return put_u64(si, arg); | |
1875 | } | |
2348ca17 JD |
1876 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1877 | { | |
1878 | uint64_t ts; | |
1879 | ||
dd5a0db3 | 1880 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1881 | if (ret < 0) |
1882 | goto error; | |
1883 | return put_u64(ts, arg); | |
1884 | } | |
5b3cf4f9 JD |
1885 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
1886 | { | |
1887 | uint64_t seq; | |
1888 | ||
1889 | ret = ops->sequence_number(config, buf, &seq); | |
1890 | if (ret < 0) | |
1891 | goto error; | |
1892 | return put_u64(seq, arg); | |
1893 | } | |
5594698f JD |
1894 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
1895 | { | |
1896 | uint64_t id; | |
1897 | ||
1898 | ret = ops->instance_id(config, buf, &id); | |
1899 | if (ret < 0) | |
1900 | goto error; | |
1901 | return put_u64(id, arg); | |
1902 | } | |
3b731ab1 JD |
1903 | default: |
1904 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1905 | cmd, arg); | |
1906 | } | |
1907 | ||
1908 | error: | |
1909 | return -ENOSYS; | |
ed8d02d6 JD |
1910 | } |
1911 | #endif /* CONFIG_COMPAT */ | |
1912 | ||
1913 | static void lttng_stream_override_ring_buffer_fops(void) | |
1914 | { | |
1915 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1916 | lttng_stream_ring_buffer_file_operations.open = | |
1917 | lib_ring_buffer_file_operations.open; | |
1918 | lttng_stream_ring_buffer_file_operations.release = | |
1919 | lib_ring_buffer_file_operations.release; | |
1920 | lttng_stream_ring_buffer_file_operations.poll = | |
1921 | lib_ring_buffer_file_operations.poll; | |
1922 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1923 | lib_ring_buffer_file_operations.splice_read; | |
1924 | lttng_stream_ring_buffer_file_operations.mmap = | |
1925 | lib_ring_buffer_file_operations.mmap; | |
1926 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1927 | lttng_stream_ring_buffer_ioctl; | |
1928 | lttng_stream_ring_buffer_file_operations.llseek = | |
1929 | lib_ring_buffer_file_operations.llseek; | |
1930 | #ifdef CONFIG_COMPAT | |
1931 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1932 | lttng_stream_ring_buffer_compat_ioctl; | |
1933 | #endif | |
1934 | } | |
1935 | ||
80996790 | 1936 | int __init lttng_abi_init(void) |
baf20995 MD |
1937 | { |
1938 | int ret = 0; | |
1939 | ||
2754583e | 1940 | lttng_clock_ref(); |
f771eda6 JD |
1941 | |
1942 | ret = lttng_tp_mempool_init(); | |
1943 | if (ret) { | |
1944 | goto error; | |
1945 | } | |
1946 | ||
d29348f7 | 1947 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 1948 | <tng_proc_ops, NULL); |
2470a237 | 1949 | |
255e52a4 | 1950 | if (!lttng_proc_dentry) { |
baf20995 MD |
1951 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1952 | ret = -ENOMEM; | |
1953 | goto error; | |
1954 | } | |
ed8d02d6 | 1955 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 1956 | return 0; |
ed8d02d6 | 1957 | |
baf20995 | 1958 | error: |
f771eda6 | 1959 | lttng_tp_mempool_destroy(); |
2754583e | 1960 | lttng_clock_unref(); |
baf20995 MD |
1961 | return ret; |
1962 | } | |
1963 | ||
e6e65fcd MD |
1964 | /* No __exit annotation because used by init error path too. */ |
1965 | void lttng_abi_exit(void) | |
baf20995 | 1966 | { |
f771eda6 | 1967 | lttng_tp_mempool_destroy(); |
2754583e | 1968 | lttng_clock_unref(); |
e6a17f26 MD |
1969 | if (lttng_proc_dentry) |
1970 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1971 | } |