Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
2d70eed1 | 33 | #include <linux/kref.h> |
241ae9a8 MD |
34 | #include <wrapper/ringbuffer/vfs.h> |
35 | #include <wrapper/ringbuffer/backend.h> | |
36 | #include <wrapper/ringbuffer/frontend.h> | |
241ae9a8 | 37 | #include <wrapper/file.h> |
4993071a | 38 | #include <lttng-string-utils.h> |
241ae9a8 MD |
39 | #include <lttng-abi.h> |
40 | #include <lttng-abi-old.h> | |
41 | #include <lttng-events.h> | |
42 | #include <lttng-tracer.h> | |
f771eda6 | 43 | #include <lttng-tp-mempool.h> |
241ae9a8 | 44 | #include <lib/ringbuffer/frontend_types.h> |
baf20995 MD |
45 | |
46 | /* | |
47 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 48 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
49 | */ |
50 | ||
e6a17f26 | 51 | static struct proc_dir_entry *lttng_proc_dentry; |
059de147 MJ |
52 | |
53 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
54 | static const struct proc_ops lttng_proc_ops; | |
55 | #else | |
56 | static const struct file_operations lttng_proc_ops; | |
57 | #endif | |
58 | ||
ad1c05e1 MD |
59 | static const struct file_operations lttng_session_fops; |
60 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 61 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 62 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 63 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 64 | |
9616f0bf JD |
65 | static int put_u64(uint64_t val, unsigned long arg); |
66 | ||
a33c9927 MD |
67 | /* |
68 | * Teardown management: opened file descriptors keep a refcount on the module, | |
69 | * so it can only exit when all file descriptors are closed. | |
70 | */ | |
71 | ||
ad1c05e1 | 72 | static |
baf20995 MD |
73 | int lttng_abi_create_session(void) |
74 | { | |
a90917c3 | 75 | struct lttng_session *session; |
c0e31d2e | 76 | struct file *session_file; |
11b5a3c2 | 77 | int session_fd, ret; |
baf20995 | 78 | |
a90917c3 | 79 | session = lttng_session_create(); |
baf20995 MD |
80 | if (!session) |
81 | return -ENOMEM; | |
4ac10b76 | 82 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
83 | if (session_fd < 0) { |
84 | ret = session_fd; | |
85 | goto fd_error; | |
86 | } | |
c0e31d2e | 87 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 88 | <tng_session_fops, |
baf20995 | 89 | session, O_RDWR); |
c0e31d2e MD |
90 | if (IS_ERR(session_file)) { |
91 | ret = PTR_ERR(session_file); | |
baf20995 MD |
92 | goto file_error; |
93 | } | |
c0e31d2e MD |
94 | session->file = session_file; |
95 | fd_install(session_fd, session_file); | |
baf20995 MD |
96 | return session_fd; |
97 | ||
98 | file_error: | |
99 | put_unused_fd(session_fd); | |
100 | fd_error: | |
a90917c3 | 101 | lttng_session_destroy(session); |
baf20995 MD |
102 | return ret; |
103 | } | |
104 | ||
271b6681 MD |
105 | static |
106 | int lttng_abi_tracepoint_list(void) | |
107 | { | |
108 | struct file *tracepoint_list_file; | |
109 | int file_fd, ret; | |
110 | ||
4ac10b76 | 111 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
112 | if (file_fd < 0) { |
113 | ret = file_fd; | |
114 | goto fd_error; | |
115 | } | |
30f18bf0 | 116 | |
8ee099b6 | 117 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
118 | <tng_tracepoint_list_fops, |
119 | NULL, O_RDWR); | |
120 | if (IS_ERR(tracepoint_list_file)) { | |
121 | ret = PTR_ERR(tracepoint_list_file); | |
122 | goto file_error; | |
123 | } | |
30f18bf0 MD |
124 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
125 | if (ret < 0) | |
126 | goto open_error; | |
271b6681 MD |
127 | fd_install(file_fd, tracepoint_list_file); |
128 | return file_fd; | |
129 | ||
30f18bf0 MD |
130 | open_error: |
131 | fput(tracepoint_list_file); | |
271b6681 MD |
132 | file_error: |
133 | put_unused_fd(file_fd); | |
134 | fd_error: | |
135 | return ret; | |
136 | } | |
137 | ||
f127e61e MD |
138 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
139 | static inline | |
140 | int lttng_abi_syscall_list(void) | |
141 | { | |
142 | return -ENOSYS; | |
143 | } | |
144 | #else | |
145 | static | |
146 | int lttng_abi_syscall_list(void) | |
147 | { | |
148 | struct file *syscall_list_file; | |
149 | int file_fd, ret; | |
150 | ||
151 | file_fd = lttng_get_unused_fd(); | |
152 | if (file_fd < 0) { | |
153 | ret = file_fd; | |
154 | goto fd_error; | |
155 | } | |
156 | ||
157 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
158 | <tng_syscall_list_fops, | |
159 | NULL, O_RDWR); | |
160 | if (IS_ERR(syscall_list_file)) { | |
161 | ret = PTR_ERR(syscall_list_file); | |
162 | goto file_error; | |
163 | } | |
164 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
165 | if (ret < 0) | |
166 | goto open_error; | |
167 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
168 | return file_fd; |
169 | ||
170 | open_error: | |
171 | fput(syscall_list_file); | |
172 | file_error: | |
173 | put_unused_fd(file_fd); | |
174 | fd_error: | |
175 | return ret; | |
176 | } | |
177 | #endif | |
178 | ||
80c16bcf | 179 | static |
6dccd6c1 | 180 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 181 | { |
6dccd6c1 JD |
182 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
183 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
184 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
185 | } |
186 | ||
42cabb80 MD |
187 | static |
188 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
189 | { | |
190 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
191 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
192 | } | |
193 | ||
8070f5c0 MD |
194 | static |
195 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 196 | struct lttng_kernel_context *context_param, |
a90917c3 | 197 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 198 | { |
8070f5c0 MD |
199 | |
200 | if (session->been_active) | |
201 | return -EPERM; | |
202 | ||
6dccd6c1 | 203 | switch (context_param->ctx) { |
12a313a5 | 204 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 205 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
206 | case LTTNG_KERNEL_CONTEXT_PRIO: |
207 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
208 | case LTTNG_KERNEL_CONTEXT_NICE: |
209 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
210 | case LTTNG_KERNEL_CONTEXT_VPID: |
211 | return lttng_add_vpid_to_ctx(ctx); | |
212 | case LTTNG_KERNEL_CONTEXT_TID: | |
213 | return lttng_add_tid_to_ctx(ctx); | |
214 | case LTTNG_KERNEL_CONTEXT_VTID: | |
215 | return lttng_add_vtid_to_ctx(ctx); | |
216 | case LTTNG_KERNEL_CONTEXT_PPID: | |
217 | return lttng_add_ppid_to_ctx(ctx); | |
218 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
219 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 220 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
221 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
222 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
223 | context_param->u.perf_counter.config, | |
224 | context_param->u.perf_counter.name, | |
c24a0d71 | 225 | ctx); |
a2563e83 MD |
226 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
227 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
228 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
229 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
230 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
231 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
232 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
233 | return lttng_add_interruptible_to_ctx(ctx); | |
234 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
235 | return lttng_add_need_reschedule_to_ctx(ctx); | |
236 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
237 | return lttng_add_preemptible_to_ctx(ctx); | |
238 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
239 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
240 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
241 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
242 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
243 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
244 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
245 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
246 | return lttng_add_ipc_ns_to_ctx(ctx); | |
247 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
248 | return lttng_add_mnt_ns_to_ctx(ctx); | |
249 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
250 | return lttng_add_net_ns_to_ctx(ctx); | |
251 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
252 | return lttng_add_pid_ns_to_ctx(ctx); | |
253 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
254 | return lttng_add_user_ns_to_ctx(ctx); | |
255 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
256 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
257 | case LTTNG_KERNEL_CONTEXT_UID: |
258 | return lttng_add_uid_to_ctx(ctx); | |
259 | case LTTNG_KERNEL_CONTEXT_EUID: | |
260 | return lttng_add_euid_to_ctx(ctx); | |
261 | case LTTNG_KERNEL_CONTEXT_SUID: | |
262 | return lttng_add_suid_to_ctx(ctx); | |
263 | case LTTNG_KERNEL_CONTEXT_GID: | |
264 | return lttng_add_gid_to_ctx(ctx); | |
265 | case LTTNG_KERNEL_CONTEXT_EGID: | |
266 | return lttng_add_egid_to_ctx(ctx); | |
267 | case LTTNG_KERNEL_CONTEXT_SGID: | |
268 | return lttng_add_sgid_to_ctx(ctx); | |
269 | case LTTNG_KERNEL_CONTEXT_VUID: | |
270 | return lttng_add_vuid_to_ctx(ctx); | |
271 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
272 | return lttng_add_veuid_to_ctx(ctx); | |
273 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
274 | return lttng_add_vsuid_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_VGID: | |
276 | return lttng_add_vgid_to_ctx(ctx); | |
277 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
278 | return lttng_add_vegid_to_ctx(ctx); | |
279 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
280 | return lttng_add_vsgid_to_ctx(ctx); | |
8070f5c0 MD |
281 | default: |
282 | return -EINVAL; | |
283 | } | |
284 | } | |
285 | ||
ad1c05e1 MD |
286 | /** |
287 | * lttng_ioctl - lttng syscall through ioctl | |
288 | * | |
c0e31d2e | 289 | * @file: the file |
ad1c05e1 MD |
290 | * @cmd: the command |
291 | * @arg: command arg | |
292 | * | |
293 | * This ioctl implements lttng commands: | |
38d024ae | 294 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 295 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
296 | * LTTNG_KERNEL_TRACER_VERSION |
297 | * Returns the LTTng kernel tracer version | |
298 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
299 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
300 | * LTTNG_KERNEL_WAIT_QUIESCENT |
301 | * Returns after all previously running probes have completed | |
42cabb80 MD |
302 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
303 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
304 | * |
305 | * The returned session will be deleted when its file descriptor is closed. | |
306 | */ | |
307 | static | |
c0e31d2e | 308 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
309 | { |
310 | switch (cmd) { | |
6dccd6c1 | 311 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 312 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 313 | return lttng_abi_create_session(); |
6dccd6c1 JD |
314 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
315 | { | |
316 | struct lttng_kernel_tracer_version v; | |
317 | struct lttng_kernel_old_tracer_version oldv; | |
318 | struct lttng_kernel_old_tracer_version *uversion = | |
319 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
320 | ||
321 | lttng_abi_tracer_version(&v); | |
322 | oldv.major = v.major; | |
323 | oldv.minor = v.minor; | |
324 | oldv.patchlevel = v.patchlevel; | |
325 | ||
326 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
327 | return -EFAULT; | |
328 | return 0; | |
329 | } | |
80c16bcf | 330 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
331 | { |
332 | struct lttng_kernel_tracer_version version; | |
333 | struct lttng_kernel_tracer_version *uversion = | |
334 | (struct lttng_kernel_tracer_version __user *) arg; | |
335 | ||
336 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
337 | |
338 | if (copy_to_user(uversion, &version, sizeof(version))) | |
339 | return -EFAULT; | |
340 | return 0; | |
341 | } | |
342 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
343 | { | |
344 | struct lttng_kernel_tracer_abi_version version; | |
345 | struct lttng_kernel_tracer_abi_version *uversion = | |
346 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
347 | ||
348 | lttng_abi_tracer_abi_version(&version); | |
349 | ||
6dccd6c1 JD |
350 | if (copy_to_user(uversion, &version, sizeof(version))) |
351 | return -EFAULT; | |
352 | return 0; | |
353 | } | |
354 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
355 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
356 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
357 | case LTTNG_KERNEL_SYSCALL_LIST: |
358 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 359 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
360 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
361 | synchronize_trace(); | |
362 | return 0; | |
6dccd6c1 JD |
363 | case LTTNG_KERNEL_OLD_CALIBRATE: |
364 | { | |
365 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
366 | (struct lttng_kernel_old_calibrate __user *) arg; | |
367 | struct lttng_kernel_old_calibrate old_calibrate; | |
368 | struct lttng_kernel_calibrate calibrate; | |
369 | int ret; | |
370 | ||
371 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
372 | return -EFAULT; | |
373 | calibrate.type = old_calibrate.type; | |
374 | ret = lttng_calibrate(&calibrate); | |
375 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
376 | return -EFAULT; | |
377 | return ret; | |
378 | } | |
57105fc2 MD |
379 | case LTTNG_KERNEL_CALIBRATE: |
380 | { | |
3db41b2c MD |
381 | struct lttng_kernel_calibrate __user *ucalibrate = |
382 | (struct lttng_kernel_calibrate __user *) arg; | |
383 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
384 | int ret; |
385 | ||
386 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
387 | return -EFAULT; | |
388 | ret = lttng_calibrate(&calibrate); | |
389 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
390 | return -EFAULT; | |
391 | return ret; | |
392 | } | |
ad1c05e1 MD |
393 | default: |
394 | return -ENOIOCTLCMD; | |
395 | } | |
396 | } | |
397 | ||
059de147 MJ |
398 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) |
399 | static const struct proc_ops lttng_proc_ops = { | |
400 | .proc_ioctl = lttng_ioctl, | |
401 | #ifdef CONFIG_COMPAT | |
402 | .proc_compat_ioctl = lttng_ioctl, | |
403 | #endif /* CONFIG_COMPAT */ | |
404 | }; | |
405 | #else | |
406 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 407 | .owner = THIS_MODULE, |
ad1c05e1 MD |
408 | .unlocked_ioctl = lttng_ioctl, |
409 | #ifdef CONFIG_COMPAT | |
03037b98 | 410 | .compat_ioctl = lttng_ioctl, |
059de147 | 411 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 412 | }; |
059de147 | 413 | #endif |
ad1c05e1 | 414 | |
5dbbdb43 | 415 | static |
c0e31d2e | 416 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 417 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 418 | enum channel_type channel_type) |
baf20995 | 419 | { |
a90917c3 | 420 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 421 | const struct file_operations *fops = NULL; |
5dbbdb43 | 422 | const char *transport_name; |
a90917c3 | 423 | struct lttng_channel *chan; |
c0e31d2e | 424 | struct file *chan_file; |
baf20995 | 425 | int chan_fd; |
ad1c05e1 | 426 | int ret = 0; |
baf20995 | 427 | |
4ac10b76 | 428 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
429 | if (chan_fd < 0) { |
430 | ret = chan_fd; | |
431 | goto fd_error; | |
432 | } | |
88dfd899 MD |
433 | switch (channel_type) { |
434 | case PER_CPU_CHANNEL: | |
435 | fops = <tng_channel_fops; | |
436 | break; | |
437 | case METADATA_CHANNEL: | |
438 | fops = <tng_metadata_fops; | |
439 | break; | |
440 | } | |
2470a237 | 441 | |
c0e31d2e | 442 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 443 | fops, |
03037b98 | 444 | NULL, O_RDWR); |
c0e31d2e MD |
445 | if (IS_ERR(chan_file)) { |
446 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
447 | goto file_error; |
448 | } | |
5dbbdb43 MD |
449 | switch (channel_type) { |
450 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
451 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
452 | transport_name = chan_param->overwrite ? | |
96ba7208 | 453 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
454 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
455 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
456 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
457 | } else { | |
458 | return -EINVAL; | |
459 | } | |
5dbbdb43 | 460 | break; |
5dbbdb43 | 461 | case METADATA_CHANNEL: |
6dccd6c1 | 462 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 463 | transport_name = "relay-metadata"; |
6dccd6c1 | 464 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
465 | transport_name = "relay-metadata-mmap"; |
466 | else | |
467 | return -EINVAL; | |
5dbbdb43 MD |
468 | break; |
469 | default: | |
470 | transport_name = "<unknown>"; | |
471 | break; | |
472 | } | |
98d7281c MJ |
473 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
474 | ret = -EOVERFLOW; | |
9c1f4643 MD |
475 | goto refcount_error; |
476 | } | |
03037b98 MD |
477 | /* |
478 | * We tolerate no failure path after channel creation. It will stay | |
479 | * invariant for the rest of the session. | |
480 | */ | |
a90917c3 | 481 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
482 | chan_param->subbuf_size, |
483 | chan_param->num_subbuf, | |
484 | chan_param->switch_timer_interval, | |
d83004aa JD |
485 | chan_param->read_timer_interval, |
486 | channel_type); | |
03037b98 | 487 | if (!chan) { |
f3d01b96 | 488 | ret = -EINVAL; |
03037b98 MD |
489 | goto chan_error; |
490 | } | |
11b5a3c2 | 491 | chan->file = chan_file; |
c0e31d2e MD |
492 | chan_file->private_data = chan; |
493 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 494 | |
baf20995 MD |
495 | return chan_fd; |
496 | ||
03037b98 | 497 | chan_error: |
9c1f4643 MD |
498 | atomic_long_dec(&session_file->f_count); |
499 | refcount_error: | |
c0e31d2e | 500 | fput(chan_file); |
baf20995 MD |
501 | file_error: |
502 | put_unused_fd(chan_fd); | |
503 | fd_error: | |
baf20995 MD |
504 | return ret; |
505 | } | |
506 | ||
7f859fbf JR |
507 | static |
508 | int lttng_abi_session_set_name(struct lttng_session *session, | |
509 | struct lttng_kernel_session_name *name) | |
510 | { | |
511 | size_t len; | |
512 | ||
513 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
514 | ||
515 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
516 | /* Name is too long/malformed */ | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | strcpy(session->name, name->name); | |
521 | return 0; | |
522 | } | |
523 | ||
1c88f269 JR |
524 | static |
525 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
526 | struct lttng_kernel_session_creation_time *time) | |
527 | { | |
528 | size_t len; | |
529 | ||
530 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
531 | ||
532 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
533 | /* Time is too long/malformed */ | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
537 | strcpy(session->creation_time, time->iso8601); | |
538 | return 0; | |
539 | } | |
540 | ||
d1f652f8 MD |
541 | static |
542 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
543 | { | |
544 | switch (tracker->type) { | |
545 | case LTTNG_KERNEL_TRACKER_PID: | |
546 | return TRACKER_PID; | |
547 | case LTTNG_KERNEL_TRACKER_VPID: | |
548 | return TRACKER_VPID; | |
549 | case LTTNG_KERNEL_TRACKER_UID: | |
550 | return TRACKER_UID; | |
551 | case LTTNG_KERNEL_TRACKER_VUID: | |
552 | return TRACKER_VUID; | |
553 | case LTTNG_KERNEL_TRACKER_GID: | |
554 | return TRACKER_GID; | |
555 | case LTTNG_KERNEL_TRACKER_VGID: | |
556 | return TRACKER_VGID; | |
557 | default: | |
558 | return TRACKER_UNKNOWN; | |
559 | } | |
560 | } | |
561 | ||
baf20995 | 562 | /** |
ad1c05e1 | 563 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 564 | * |
c0e31d2e | 565 | * @file: the file |
baf20995 MD |
566 | * @cmd: the command |
567 | * @arg: command arg | |
568 | * | |
569 | * This ioctl implements lttng commands: | |
38d024ae | 570 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 571 | * Returns a LTTng channel file descriptor |
e64957da MD |
572 | * LTTNG_KERNEL_ENABLE |
573 | * Enables tracing for a session (weak enable) | |
574 | * LTTNG_KERNEL_DISABLE | |
575 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
576 | * LTTNG_KERNEL_METADATA |
577 | * Returns a LTTng metadata file descriptor | |
e0130fab | 578 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 579 | * Add PID to session PID tracker |
e0130fab | 580 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
581 | * Remove PID from session PID tracker |
582 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
583 | * Add ID to tracker | |
584 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
585 | * Remove ID from tracker | |
ad1c05e1 MD |
586 | * |
587 | * The returned channel will be deleted when its file descriptor is closed. | |
588 | */ | |
589 | static | |
c0e31d2e | 590 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 591 | { |
a90917c3 | 592 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
593 | struct lttng_kernel_channel chan_param; |
594 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 595 | |
ad1c05e1 | 596 | switch (cmd) { |
6dccd6c1 JD |
597 | case LTTNG_KERNEL_OLD_CHANNEL: |
598 | { | |
6dccd6c1 JD |
599 | if (copy_from_user(&old_chan_param, |
600 | (struct lttng_kernel_old_channel __user *) arg, | |
601 | sizeof(struct lttng_kernel_old_channel))) | |
602 | return -EFAULT; | |
603 | chan_param.overwrite = old_chan_param.overwrite; | |
604 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
605 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
606 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
607 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
608 | chan_param.output = old_chan_param.output; | |
609 | ||
610 | return lttng_abi_create_channel(file, &chan_param, | |
611 | PER_CPU_CHANNEL); | |
612 | } | |
38d024ae | 613 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 614 | { |
6dccd6c1 | 615 | if (copy_from_user(&chan_param, |
38d024ae | 616 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
617 | sizeof(struct lttng_kernel_channel))) |
618 | return -EFAULT; | |
619 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 620 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
621 | } |
622 | case LTTNG_KERNEL_OLD_SESSION_START: | |
623 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 624 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 625 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 626 | return lttng_session_enable(session); |
6dccd6c1 JD |
627 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
628 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 629 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 630 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 631 | return lttng_session_disable(session); |
6dccd6c1 JD |
632 | case LTTNG_KERNEL_OLD_METADATA: |
633 | { | |
6dccd6c1 JD |
634 | if (copy_from_user(&old_chan_param, |
635 | (struct lttng_kernel_old_channel __user *) arg, | |
636 | sizeof(struct lttng_kernel_old_channel))) | |
637 | return -EFAULT; | |
638 | chan_param.overwrite = old_chan_param.overwrite; | |
639 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
640 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
641 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
642 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
643 | chan_param.output = old_chan_param.output; | |
644 | ||
645 | return lttng_abi_create_channel(file, &chan_param, | |
646 | METADATA_CHANNEL); | |
647 | } | |
38d024ae | 648 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 649 | { |
6dccd6c1 JD |
650 | if (copy_from_user(&chan_param, |
651 | (struct lttng_kernel_channel __user *) arg, | |
652 | sizeof(struct lttng_kernel_channel))) | |
653 | return -EFAULT; | |
654 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 655 | METADATA_CHANNEL); |
6dccd6c1 | 656 | } |
e0130fab | 657 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 658 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 659 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
660 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
661 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
662 | { | |
663 | struct lttng_kernel_tracker_args tracker; | |
664 | enum tracker_type tracker_type; | |
665 | ||
666 | if (copy_from_user(&tracker, | |
667 | (struct lttng_kernel_tracker_args __user *) arg, | |
668 | sizeof(struct lttng_kernel_tracker_args))) | |
669 | return -EFAULT; | |
670 | tracker_type = get_tracker_type(&tracker); | |
671 | if (tracker_type == TRACKER_UNKNOWN) | |
672 | return -EINVAL; | |
673 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
674 | } | |
675 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
676 | { | |
677 | struct lttng_kernel_tracker_args tracker; | |
678 | enum tracker_type tracker_type; | |
679 | ||
680 | if (copy_from_user(&tracker, | |
681 | (struct lttng_kernel_tracker_args __user *) arg, | |
682 | sizeof(struct lttng_kernel_tracker_args))) | |
683 | return -EFAULT; | |
684 | tracker_type = get_tracker_type(&tracker); | |
685 | if (tracker_type == TRACKER_UNKNOWN) | |
686 | return -EINVAL; | |
687 | return lttng_session_untrack_id(session, tracker_type, | |
688 | tracker.id); | |
689 | } | |
7e6f9ef6 | 690 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
691 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
692 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
693 | { | |
694 | struct lttng_kernel_tracker_args tracker; | |
695 | enum tracker_type tracker_type; | |
696 | ||
697 | if (copy_from_user(&tracker, | |
698 | (struct lttng_kernel_tracker_args __user *) arg, | |
699 | sizeof(struct lttng_kernel_tracker_args))) | |
700 | return -EFAULT; | |
701 | tracker_type = get_tracker_type(&tracker); | |
702 | if (tracker_type == TRACKER_UNKNOWN) | |
703 | return -EINVAL; | |
704 | return lttng_session_list_tracker_ids(session, tracker_type); | |
705 | } | |
9616f0bf JD |
706 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
707 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
708 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
709 | return lttng_session_statedump(session); | |
7f859fbf JR |
710 | case LTTNG_KERNEL_SESSION_SET_NAME: |
711 | { | |
712 | struct lttng_kernel_session_name name; | |
713 | ||
714 | if (copy_from_user(&name, | |
715 | (struct lttng_kernel_session_name __user *) arg, | |
716 | sizeof(struct lttng_kernel_session_name))) | |
717 | return -EFAULT; | |
718 | return lttng_abi_session_set_name(session, &name); | |
719 | } | |
1c88f269 JR |
720 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
721 | { | |
722 | struct lttng_kernel_session_creation_time time; | |
723 | ||
724 | if (copy_from_user(&time, | |
725 | (struct lttng_kernel_session_creation_time __user *) arg, | |
726 | sizeof(struct lttng_kernel_session_creation_time))) | |
727 | return -EFAULT; | |
728 | return lttng_abi_session_set_creation_time(session, &time); | |
729 | } | |
ad1c05e1 MD |
730 | default: |
731 | return -ENOIOCTLCMD; | |
732 | } | |
733 | } | |
734 | ||
03037b98 MD |
735 | /* |
736 | * Called when the last file reference is dropped. | |
737 | * | |
738 | * Big fat note: channels and events are invariant for the whole session after | |
739 | * their creation. So this session destruction also destroys all channel and | |
740 | * event structures specific to this session (they are not destroyed when their | |
741 | * individual file is released). | |
742 | */ | |
ad1c05e1 | 743 | static |
03037b98 | 744 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 745 | { |
a90917c3 | 746 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
747 | |
748 | if (session) | |
a90917c3 | 749 | lttng_session_destroy(session); |
11b5a3c2 | 750 | return 0; |
ad1c05e1 | 751 | } |
ad1c05e1 MD |
752 | |
753 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 754 | .owner = THIS_MODULE, |
03037b98 | 755 | .release = lttng_session_release, |
ad1c05e1 MD |
756 | .unlocked_ioctl = lttng_session_ioctl, |
757 | #ifdef CONFIG_COMPAT | |
03037b98 | 758 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 759 | #endif |
11b5a3c2 | 760 | }; |
ad1c05e1 | 761 | |
d83004aa JD |
762 | /** |
763 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
764 | * @filp: the file | |
765 | * @wait: poll table | |
766 | * | |
767 | * Handles the poll operations for the metadata channels. | |
768 | */ | |
ad1c05e1 | 769 | static |
d83004aa JD |
770 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
771 | poll_table *wait) | |
772 | { | |
773 | struct lttng_metadata_stream *stream = filp->private_data; | |
774 | struct lib_ring_buffer *buf = stream->priv; | |
775 | int finalized; | |
776 | unsigned int mask = 0; | |
777 | ||
778 | if (filp->f_mode & FMODE_READ) { | |
d83004aa JD |
779 | poll_wait(filp, &stream->read_wait, wait); |
780 | ||
781 | finalized = stream->finalized; | |
782 | ||
783 | /* | |
784 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
785 | * ordering finalized load before offsets loads. | |
786 | */ | |
787 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
788 | ||
789 | if (finalized) | |
790 | mask |= POLLHUP; | |
791 | ||
92d9f5e6 | 792 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 793 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 794 | stream->metadata_out) |
d83004aa | 795 | mask |= POLLIN; |
92d9f5e6 | 796 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
797 | } |
798 | ||
799 | return mask; | |
800 | } | |
801 | ||
f613e3e6 MD |
802 | static |
803 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
804 | unsigned int cmd, unsigned long arg) | |
805 | { | |
806 | struct lttng_metadata_stream *stream = filp->private_data; | |
807 | ||
808 | stream->metadata_out = stream->metadata_in; | |
809 | } | |
810 | ||
d1344afa JD |
811 | /* |
812 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
813 | * the consumer receives the content of the metadata cache unchanged. This is | |
814 | * different from the metadata_regenerate where the offset from epoch is | |
815 | * resampled, here we want the exact same content as the last time the metadata | |
816 | * was generated. This command is only possible if all the metadata written | |
817 | * in the cache has been output to the metadata stream to avoid corrupting the | |
818 | * metadata file. | |
819 | * | |
820 | * Return 0 on success, a negative value on error. | |
821 | */ | |
822 | static | |
823 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
824 | { | |
825 | int ret; | |
826 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
827 | ||
828 | mutex_lock(&cache->lock); | |
829 | if (stream->metadata_out != cache->metadata_written) { | |
830 | ret = -EBUSY; | |
831 | goto end; | |
832 | } | |
833 | stream->metadata_out = 0; | |
834 | stream->metadata_in = 0; | |
835 | wake_up_interruptible(&stream->read_wait); | |
836 | ret = 0; | |
837 | ||
838 | end: | |
839 | mutex_unlock(&cache->lock); | |
840 | return ret; | |
841 | } | |
842 | ||
d83004aa JD |
843 | static |
844 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
845 | unsigned int cmd, unsigned long arg) | |
846 | { | |
847 | int ret; | |
848 | struct lttng_metadata_stream *stream = filp->private_data; | |
849 | struct lib_ring_buffer *buf = stream->priv; | |
850 | ||
851 | switch (cmd) { | |
d83004aa JD |
852 | case RING_BUFFER_GET_NEXT_SUBBUF: |
853 | { | |
35097f36 JD |
854 | struct lttng_metadata_stream *stream = filp->private_data; |
855 | struct lib_ring_buffer *buf = stream->priv; | |
856 | struct channel *chan = buf->backend.chan; | |
857 | ||
858 | ret = lttng_metadata_output_channel(stream, chan); | |
859 | if (ret > 0) { | |
860 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
861 | ret = 0; | |
862 | } else if (ret < 0) | |
d83004aa JD |
863 | goto err; |
864 | break; | |
865 | } | |
f613e3e6 MD |
866 | case RING_BUFFER_GET_SUBBUF: |
867 | { | |
868 | /* | |
869 | * Random access is not allowed for metadata channel. | |
870 | */ | |
871 | return -ENOSYS; | |
872 | } | |
c6f05468 | 873 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
35097f36 JD |
874 | case RING_BUFFER_FLUSH: |
875 | { | |
876 | struct lttng_metadata_stream *stream = filp->private_data; | |
877 | struct lib_ring_buffer *buf = stream->priv; | |
878 | struct channel *chan = buf->backend.chan; | |
879 | ||
880 | /* | |
881 | * Before doing the actual ring buffer flush, write up to one | |
882 | * packet of metadata in the ring buffer. | |
883 | */ | |
884 | ret = lttng_metadata_output_channel(stream, chan); | |
885 | if (ret < 0) | |
886 | goto err; | |
887 | break; | |
888 | } | |
9616f0bf JD |
889 | case RING_BUFFER_GET_METADATA_VERSION: |
890 | { | |
891 | struct lttng_metadata_stream *stream = filp->private_data; | |
892 | ||
893 | return put_u64(stream->version, arg); | |
894 | } | |
d1344afa JD |
895 | case RING_BUFFER_METADATA_CACHE_DUMP: |
896 | { | |
897 | struct lttng_metadata_stream *stream = filp->private_data; | |
898 | ||
899 | return lttng_metadata_cache_dump(stream); | |
900 | } | |
d83004aa JD |
901 | default: |
902 | break; | |
903 | } | |
f613e3e6 MD |
904 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
905 | ||
d83004aa | 906 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
907 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
908 | if (ret < 0) | |
909 | goto err; | |
d83004aa | 910 | |
f613e3e6 MD |
911 | switch (cmd) { |
912 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
913 | { | |
914 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
915 | cmd, arg); | |
916 | break; | |
917 | } | |
918 | default: | |
919 | break; | |
920 | } | |
d83004aa JD |
921 | err: |
922 | return ret; | |
923 | } | |
924 | ||
aeb9064d | 925 | #ifdef CONFIG_COMPAT |
d83004aa JD |
926 | static |
927 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
928 | unsigned int cmd, unsigned long arg) | |
929 | { | |
930 | int ret; | |
931 | struct lttng_metadata_stream *stream = filp->private_data; | |
932 | struct lib_ring_buffer *buf = stream->priv; | |
933 | ||
934 | switch (cmd) { | |
d83004aa JD |
935 | case RING_BUFFER_GET_NEXT_SUBBUF: |
936 | { | |
35097f36 JD |
937 | struct lttng_metadata_stream *stream = filp->private_data; |
938 | struct lib_ring_buffer *buf = stream->priv; | |
939 | struct channel *chan = buf->backend.chan; | |
940 | ||
941 | ret = lttng_metadata_output_channel(stream, chan); | |
942 | if (ret > 0) { | |
943 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
944 | ret = 0; | |
945 | } else if (ret < 0) | |
d83004aa JD |
946 | goto err; |
947 | break; | |
948 | } | |
f613e3e6 MD |
949 | case RING_BUFFER_GET_SUBBUF: |
950 | { | |
951 | /* | |
952 | * Random access is not allowed for metadata channel. | |
953 | */ | |
954 | return -ENOSYS; | |
955 | } | |
c6f05468 | 956 | case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */ |
96c55c2f MD |
957 | case RING_BUFFER_FLUSH: |
958 | { | |
959 | struct lttng_metadata_stream *stream = filp->private_data; | |
960 | struct lib_ring_buffer *buf = stream->priv; | |
961 | struct channel *chan = buf->backend.chan; | |
962 | ||
963 | /* | |
964 | * Before doing the actual ring buffer flush, write up to one | |
965 | * packet of metadata in the ring buffer. | |
966 | */ | |
967 | ret = lttng_metadata_output_channel(stream, chan); | |
968 | if (ret < 0) | |
969 | goto err; | |
970 | break; | |
971 | } | |
972 | case RING_BUFFER_GET_METADATA_VERSION: | |
973 | { | |
974 | struct lttng_metadata_stream *stream = filp->private_data; | |
975 | ||
976 | return put_u64(stream->version, arg); | |
977 | } | |
d1344afa JD |
978 | case RING_BUFFER_METADATA_CACHE_DUMP: |
979 | { | |
980 | struct lttng_metadata_stream *stream = filp->private_data; | |
981 | ||
982 | return lttng_metadata_cache_dump(stream); | |
983 | } | |
d83004aa JD |
984 | default: |
985 | break; | |
986 | } | |
f613e3e6 MD |
987 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
988 | ||
d83004aa | 989 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
990 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
991 | if (ret < 0) | |
992 | goto err; | |
d83004aa | 993 | |
f613e3e6 MD |
994 | switch (cmd) { |
995 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
996 | { | |
997 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
998 | cmd, arg); | |
999 | break; | |
1000 | } | |
1001 | default: | |
1002 | break; | |
1003 | } | |
d83004aa JD |
1004 | err: |
1005 | return ret; | |
1006 | } | |
aeb9064d | 1007 | #endif |
d83004aa | 1008 | |
b3b8072b MD |
1009 | /* |
1010 | * This is not used by anonymous file descriptors. This code is left | |
1011 | * there if we ever want to implement an inode with open() operation. | |
1012 | */ | |
d83004aa JD |
1013 | static |
1014 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1015 | { | |
1016 | struct lttng_metadata_stream *stream = inode->i_private; | |
1017 | struct lib_ring_buffer *buf = stream->priv; | |
1018 | ||
1019 | file->private_data = buf; | |
b3b8072b MD |
1020 | /* |
1021 | * Since life-time of metadata cache differs from that of | |
1022 | * session, we need to keep our own reference on the transport. | |
1023 | */ | |
1024 | if (!try_module_get(stream->transport->owner)) { | |
1025 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1026 | return -EBUSY; | |
1027 | } | |
d83004aa JD |
1028 | return lib_ring_buffer_open(inode, file, buf); |
1029 | } | |
1030 | ||
1031 | static | |
1032 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1033 | { | |
1034 | struct lttng_metadata_stream *stream = file->private_data; | |
1035 | struct lib_ring_buffer *buf = stream->priv; | |
1036 | ||
1037 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 1038 | module_put(stream->transport->owner); |
d83004aa JD |
1039 | return lib_ring_buffer_release(inode, file, buf); |
1040 | } | |
1041 | ||
1042 | static | |
1043 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1044 | struct pipe_inode_info *pipe, size_t len, | |
1045 | unsigned int flags) | |
1046 | { | |
1047 | struct lttng_metadata_stream *stream = in->private_data; | |
1048 | struct lib_ring_buffer *buf = stream->priv; | |
1049 | ||
1050 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1051 | flags, buf); | |
1052 | } | |
1053 | ||
1054 | static | |
1055 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1056 | struct vm_area_struct *vma) | |
1057 | { | |
1058 | struct lttng_metadata_stream *stream = filp->private_data; | |
1059 | struct lib_ring_buffer *buf = stream->priv; | |
1060 | ||
1061 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1062 | } | |
1063 | ||
1064 | static | |
1065 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1066 | .owner = THIS_MODULE, | |
1067 | .open = lttng_metadata_ring_buffer_open, | |
1068 | .release = lttng_metadata_ring_buffer_release, | |
1069 | .poll = lttng_metadata_ring_buffer_poll, | |
1070 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1071 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1072 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1073 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1074 | #ifdef CONFIG_COMPAT | |
1075 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1076 | #endif | |
1077 | }; | |
1078 | ||
1079 | static | |
1080 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
1081 | const struct file_operations *fops) | |
ad1c05e1 | 1082 | { |
ad1c05e1 | 1083 | int stream_fd, ret; |
11b5a3c2 | 1084 | struct file *stream_file; |
ad1c05e1 | 1085 | |
4ac10b76 | 1086 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1087 | if (stream_fd < 0) { |
1088 | ret = stream_fd; | |
1089 | goto fd_error; | |
1090 | } | |
d83004aa JD |
1091 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
1092 | stream_priv, O_RDWR); | |
c0e31d2e MD |
1093 | if (IS_ERR(stream_file)) { |
1094 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1095 | goto file_error; |
1096 | } | |
409453cb MD |
1097 | /* |
1098 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1099 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1100 | * file descriptor, so we set FMODE_PREAD here. | |
1101 | */ | |
d7b6f197 | 1102 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1103 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1104 | /* |
1105 | * The stream holds a reference to the channel within the generic ring | |
1106 | * buffer library, so no need to hold a refcount on the channel and | |
1107 | * session files here. | |
1108 | */ | |
ad1c05e1 MD |
1109 | return stream_fd; |
1110 | ||
1111 | file_error: | |
1112 | put_unused_fd(stream_fd); | |
d83004aa JD |
1113 | fd_error: |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static | |
1118 | int lttng_abi_open_stream(struct file *channel_file) | |
1119 | { | |
1120 | struct lttng_channel *channel = channel_file->private_data; | |
1121 | struct lib_ring_buffer *buf; | |
1122 | int ret; | |
1123 | void *stream_priv; | |
1124 | ||
1125 | buf = channel->ops->buffer_read_open(channel->chan); | |
1126 | if (!buf) | |
1127 | return -ENOENT; | |
1128 | ||
1129 | stream_priv = buf; | |
1130 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 1131 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
1132 | if (ret < 0) |
1133 | goto fd_error; | |
1134 | ||
1135 | return ret; | |
1136 | ||
1137 | fd_error: | |
1138 | channel->ops->buffer_read_close(buf); | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static | |
1143 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1144 | { | |
1145 | struct lttng_channel *channel = channel_file->private_data; | |
1146 | struct lttng_session *session = channel->session; | |
1147 | struct lib_ring_buffer *buf; | |
1148 | int ret; | |
1149 | struct lttng_metadata_stream *metadata_stream; | |
1150 | void *stream_priv; | |
1151 | ||
1152 | buf = channel->ops->buffer_read_open(channel->chan); | |
1153 | if (!buf) | |
1154 | return -ENOENT; | |
1155 | ||
1156 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1157 | GFP_KERNEL); | |
b3b8072b MD |
1158 | if (!metadata_stream) { |
1159 | ret = -ENOMEM; | |
1160 | goto nomem; | |
1161 | } | |
d83004aa JD |
1162 | metadata_stream->metadata_cache = session->metadata_cache; |
1163 | init_waitqueue_head(&metadata_stream->read_wait); | |
1164 | metadata_stream->priv = buf; | |
1165 | stream_priv = metadata_stream; | |
b3b8072b MD |
1166 | metadata_stream->transport = channel->transport; |
1167 | ||
1168 | /* | |
1169 | * Since life-time of metadata cache differs from that of | |
1170 | * session, we need to keep our own reference on the transport. | |
1171 | */ | |
1172 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1173 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1174 | ret = -EINVAL; | |
1175 | goto notransport; | |
1176 | } | |
1177 | ||
2d70eed1 | 1178 | kref_get(&session->metadata_cache->refcount); |
d83004aa JD |
1179 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
1180 | <tng_metadata_ring_buffer_file_operations); | |
1181 | if (ret < 0) | |
1182 | goto fd_error; | |
1183 | ||
d83004aa JD |
1184 | list_add(&metadata_stream->list, |
1185 | &session->metadata_cache->metadata_stream); | |
1186 | return ret; | |
1187 | ||
ad1c05e1 | 1188 | fd_error: |
9c1f4643 | 1189 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b MD |
1190 | module_put(metadata_stream->transport->owner); |
1191 | notransport: | |
1192 | kfree(metadata_stream); | |
1193 | nomem: | |
11b5a3c2 | 1194 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1195 | return ret; |
1196 | } | |
1197 | ||
653fe716 | 1198 | static |
c0e31d2e | 1199 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1200 | struct lttng_kernel_event *event_param) |
653fe716 | 1201 | { |
a90917c3 | 1202 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1203 | int event_fd, ret; |
11b5a3c2 | 1204 | struct file *event_file; |
3c997079 | 1205 | void *priv; |
653fe716 | 1206 | |
6dccd6c1 JD |
1207 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1208 | switch (event_param->instrumentation) { | |
7371f44c | 1209 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1210 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1211 | break; |
ab2277d6 | 1212 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1213 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1214 | break; |
ab2277d6 | 1215 | case LTTNG_KERNEL_FUNCTION: |
e884017c MD |
1216 | WARN_ON_ONCE(1); |
1217 | /* Not implemented. */ | |
e0a7a7c4 MD |
1218 | break; |
1219 | default: | |
1220 | break; | |
1221 | } | |
33a39a3c MD |
1222 | event_fd = lttng_get_unused_fd(); |
1223 | if (event_fd < 0) { | |
1224 | ret = event_fd; | |
1225 | goto fd_error; | |
1226 | } | |
1227 | event_file = anon_inode_getfile("[lttng_event]", | |
1228 | <tng_event_fops, | |
1229 | NULL, O_RDWR); | |
1230 | if (IS_ERR(event_file)) { | |
1231 | ret = PTR_ERR(event_file); | |
1232 | goto file_error; | |
1233 | } | |
9c1f4643 | 1234 | /* The event holds a reference on the channel */ |
98d7281c | 1235 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1236 | ret = -EOVERFLOW; |
9c1f4643 MD |
1237 | goto refcount_error; |
1238 | } | |
33a39a3c MD |
1239 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1240 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1241 | struct lttng_enabler *enabler; | |
1242 | ||
4993071a PP |
1243 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1244 | /* | |
1245 | * If the event name is a star globbing pattern, | |
1246 | * we create the special star globbing enabler. | |
1247 | */ | |
1248 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, | |
33a39a3c | 1249 | event_param, channel); |
3c997079 | 1250 | } else { |
33a39a3c MD |
1251 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1252 | event_param, channel); | |
1ec65de1 | 1253 | } |
33a39a3c MD |
1254 | priv = enabler; |
1255 | } else { | |
1256 | struct lttng_event *event; | |
4ee2453d | 1257 | |
33a39a3c MD |
1258 | /* |
1259 | * We tolerate no failure path after event creation. It | |
1260 | * will stay invariant for the rest of the session. | |
1261 | */ | |
1262 | event = lttng_event_create(channel, event_param, | |
1263 | NULL, NULL, | |
1264 | event_param->instrumentation); | |
1265 | WARN_ON_ONCE(!event); | |
1266 | if (IS_ERR(event)) { | |
1267 | ret = PTR_ERR(event); | |
1268 | goto event_error; | |
80f87dd2 | 1269 | } |
33a39a3c | 1270 | priv = event; |
03037b98 | 1271 | } |
33a39a3c MD |
1272 | event_file->private_data = priv; |
1273 | fd_install(event_fd, event_file); | |
653fe716 MD |
1274 | return event_fd; |
1275 | ||
03037b98 | 1276 | event_error: |
9c1f4643 MD |
1277 | atomic_long_dec(&channel_file->f_count); |
1278 | refcount_error: | |
c0e31d2e | 1279 | fput(event_file); |
653fe716 MD |
1280 | file_error: |
1281 | put_unused_fd(event_fd); | |
1282 | fd_error: | |
653fe716 MD |
1283 | return ret; |
1284 | } | |
ad1c05e1 MD |
1285 | |
1286 | /** | |
1287 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1288 | * | |
c0e31d2e | 1289 | * @file: the file |
ad1c05e1 MD |
1290 | * @cmd: the command |
1291 | * @arg: command arg | |
1292 | * | |
1293 | * This ioctl implements lttng commands: | |
38d024ae | 1294 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1295 | * Returns an event stream file descriptor or failure. |
1296 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1297 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1298 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1299 | * LTTNG_KERNEL_CONTEXT |
1300 | * Prepend a context field to each event in the channel | |
e64957da MD |
1301 | * LTTNG_KERNEL_ENABLE |
1302 | * Enable recording for events in this channel (weak enable) | |
1303 | * LTTNG_KERNEL_DISABLE | |
1304 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1305 | * |
baf20995 MD |
1306 | * Channel and event file descriptors also hold a reference on the session. |
1307 | */ | |
ad1c05e1 | 1308 | static |
c0e31d2e | 1309 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1310 | { |
a90917c3 | 1311 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1312 | |
baf20995 | 1313 | switch (cmd) { |
6dccd6c1 | 1314 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1315 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1316 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1317 | case LTTNG_KERNEL_OLD_EVENT: |
1318 | { | |
1319 | struct lttng_kernel_event *uevent_param; | |
1320 | struct lttng_kernel_old_event *old_uevent_param; | |
1321 | int ret; | |
1322 | ||
1323 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1324 | GFP_KERNEL); | |
1325 | if (!uevent_param) { | |
1326 | ret = -ENOMEM; | |
1327 | goto old_event_end; | |
1328 | } | |
1329 | old_uevent_param = kmalloc( | |
1330 | sizeof(struct lttng_kernel_old_event), | |
1331 | GFP_KERNEL); | |
1332 | if (!old_uevent_param) { | |
1333 | ret = -ENOMEM; | |
1334 | goto old_event_error_free_param; | |
1335 | } | |
1336 | if (copy_from_user(old_uevent_param, | |
1337 | (struct lttng_kernel_old_event __user *) arg, | |
1338 | sizeof(struct lttng_kernel_old_event))) { | |
1339 | ret = -EFAULT; | |
1340 | goto old_event_error_free_old_param; | |
1341 | } | |
1342 | ||
1343 | memcpy(uevent_param->name, old_uevent_param->name, | |
1344 | sizeof(uevent_param->name)); | |
1345 | uevent_param->instrumentation = | |
1346 | old_uevent_param->instrumentation; | |
1347 | ||
1348 | switch (old_uevent_param->instrumentation) { | |
1349 | case LTTNG_KERNEL_KPROBE: | |
1350 | uevent_param->u.kprobe.addr = | |
1351 | old_uevent_param->u.kprobe.addr; | |
1352 | uevent_param->u.kprobe.offset = | |
1353 | old_uevent_param->u.kprobe.offset; | |
1354 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1355 | old_uevent_param->u.kprobe.symbol_name, | |
1356 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1357 | break; | |
1358 | case LTTNG_KERNEL_KRETPROBE: | |
1359 | uevent_param->u.kretprobe.addr = | |
1360 | old_uevent_param->u.kretprobe.addr; | |
1361 | uevent_param->u.kretprobe.offset = | |
1362 | old_uevent_param->u.kretprobe.offset; | |
1363 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1364 | old_uevent_param->u.kretprobe.symbol_name, | |
1365 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1366 | break; | |
1367 | case LTTNG_KERNEL_FUNCTION: | |
e884017c MD |
1368 | WARN_ON_ONCE(1); |
1369 | /* Not implemented. */ | |
6dccd6c1 JD |
1370 | break; |
1371 | default: | |
1372 | break; | |
1373 | } | |
1374 | ret = lttng_abi_create_event(file, uevent_param); | |
1375 | ||
1376 | old_event_error_free_old_param: | |
1377 | kfree(old_uevent_param); | |
1378 | old_event_error_free_param: | |
1379 | kfree(uevent_param); | |
1380 | old_event_end: | |
1381 | return ret; | |
1382 | } | |
38d024ae | 1383 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1384 | { |
1385 | struct lttng_kernel_event uevent_param; | |
1386 | ||
1387 | if (copy_from_user(&uevent_param, | |
1388 | (struct lttng_kernel_event __user *) arg, | |
1389 | sizeof(uevent_param))) | |
1390 | return -EFAULT; | |
1391 | return lttng_abi_create_event(file, &uevent_param); | |
1392 | } | |
1393 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1394 | { | |
1395 | struct lttng_kernel_context *ucontext_param; | |
1396 | struct lttng_kernel_old_context *old_ucontext_param; | |
1397 | int ret; | |
1398 | ||
1399 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1400 | GFP_KERNEL); | |
1401 | if (!ucontext_param) { | |
1402 | ret = -ENOMEM; | |
1403 | goto old_ctx_end; | |
1404 | } | |
1405 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1406 | GFP_KERNEL); | |
1407 | if (!old_ucontext_param) { | |
1408 | ret = -ENOMEM; | |
1409 | goto old_ctx_error_free_param; | |
1410 | } | |
1411 | ||
1412 | if (copy_from_user(old_ucontext_param, | |
1413 | (struct lttng_kernel_old_context __user *) arg, | |
1414 | sizeof(struct lttng_kernel_old_context))) { | |
1415 | ret = -EFAULT; | |
1416 | goto old_ctx_error_free_old_param; | |
1417 | } | |
1418 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1419 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1420 | sizeof(ucontext_param->padding)); | |
1421 | /* only type that uses the union */ | |
1422 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1423 | ucontext_param->u.perf_counter.type = | |
1424 | old_ucontext_param->u.perf_counter.type; | |
1425 | ucontext_param->u.perf_counter.config = | |
1426 | old_ucontext_param->u.perf_counter.config; | |
1427 | memcpy(ucontext_param->u.perf_counter.name, | |
1428 | old_ucontext_param->u.perf_counter.name, | |
1429 | sizeof(ucontext_param->u.perf_counter.name)); | |
1430 | } | |
1431 | ||
1432 | ret = lttng_abi_add_context(file, | |
1433 | ucontext_param, | |
1434 | &channel->ctx, channel->session); | |
1435 | ||
1436 | old_ctx_error_free_old_param: | |
1437 | kfree(old_ucontext_param); | |
1438 | old_ctx_error_free_param: | |
1439 | kfree(ucontext_param); | |
1440 | old_ctx_end: | |
1441 | return ret; | |
1442 | } | |
8070f5c0 | 1443 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1444 | { |
1445 | struct lttng_kernel_context ucontext_param; | |
1446 | ||
1447 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1448 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1449 | sizeof(ucontext_param))) |
1450 | return -EFAULT; | |
1451 | return lttng_abi_add_context(file, | |
1452 | &ucontext_param, | |
8070f5c0 | 1453 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1454 | } |
1455 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1456 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1457 | return lttng_channel_enable(channel); |
6dccd6c1 | 1458 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1459 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1460 | return lttng_channel_disable(channel); |
12e579db MD |
1461 | case LTTNG_KERNEL_SYSCALL_MASK: |
1462 | return lttng_channel_syscall_mask(channel, | |
1463 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1464 | default: |
1465 | return -ENOIOCTLCMD; | |
1466 | } | |
1467 | } | |
1468 | ||
5dbbdb43 MD |
1469 | /** |
1470 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1471 | * | |
1472 | * @file: the file | |
1473 | * @cmd: the command | |
1474 | * @arg: command arg | |
1475 | * | |
1476 | * This ioctl implements lttng commands: | |
38d024ae | 1477 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1478 | * Returns an event stream file descriptor or failure. |
1479 | * | |
1480 | * Channel and event file descriptors also hold a reference on the session. | |
1481 | */ | |
1482 | static | |
1483 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1484 | { | |
1485 | switch (cmd) { | |
6dccd6c1 | 1486 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1487 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1488 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1489 | default: |
1490 | return -ENOIOCTLCMD; | |
1491 | } | |
1492 | } | |
1493 | ||
653fe716 MD |
1494 | /** |
1495 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1496 | * | |
c0e31d2e | 1497 | * @file: the file |
653fe716 MD |
1498 | * @wait: poll table |
1499 | */ | |
c0e31d2e | 1500 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1501 | { |
a90917c3 | 1502 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1503 | unsigned int mask = 0; |
1504 | ||
c0e31d2e | 1505 | if (file->f_mode & FMODE_READ) { |
24cedcfe MD |
1506 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1507 | wait); | |
653fe716 | 1508 | |
254ec7bc MD |
1509 | if (channel->ops->is_disabled(channel->chan)) |
1510 | return POLLERR; | |
24cedcfe | 1511 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1512 | return POLLHUP; |
f71ecafa | 1513 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1514 | return POLLIN | POLLRDNORM; |
f71ecafa | 1515 | return 0; |
653fe716 MD |
1516 | } |
1517 | return mask; | |
1518 | ||
1519 | } | |
1520 | ||
0a84a57f MD |
1521 | static |
1522 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1523 | { | |
a90917c3 | 1524 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1525 | |
1526 | if (channel) | |
1527 | fput(channel->session->file); | |
0a84a57f MD |
1528 | return 0; |
1529 | } | |
1530 | ||
d83004aa JD |
1531 | static |
1532 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1533 | { | |
1534 | struct lttng_channel *channel = file->private_data; | |
1535 | ||
1536 | if (channel) { | |
d83004aa | 1537 | fput(channel->session->file); |
a3381417 | 1538 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1539 | } |
1540 | ||
1541 | return 0; | |
1542 | } | |
1543 | ||
ad1c05e1 | 1544 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1545 | .owner = THIS_MODULE, |
03037b98 | 1546 | .release = lttng_channel_release, |
653fe716 | 1547 | .poll = lttng_channel_poll, |
ad1c05e1 | 1548 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1549 | #ifdef CONFIG_COMPAT |
03037b98 | 1550 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1551 | #endif |
11b5a3c2 | 1552 | }; |
baf20995 | 1553 | |
5dbbdb43 | 1554 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1555 | .owner = THIS_MODULE, |
d83004aa | 1556 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1557 | .unlocked_ioctl = lttng_metadata_ioctl, |
1558 | #ifdef CONFIG_COMPAT | |
1559 | .compat_ioctl = lttng_metadata_ioctl, | |
1560 | #endif | |
1561 | }; | |
1562 | ||
8070f5c0 MD |
1563 | /** |
1564 | * lttng_event_ioctl - lttng syscall through ioctl | |
1565 | * | |
1566 | * @file: the file | |
1567 | * @cmd: the command | |
1568 | * @arg: command arg | |
1569 | * | |
1570 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1571 | * LTTNG_KERNEL_CONTEXT |
1572 | * Prepend a context field to each record of this event | |
e64957da MD |
1573 | * LTTNG_KERNEL_ENABLE |
1574 | * Enable recording for this event (weak enable) | |
1575 | * LTTNG_KERNEL_DISABLE | |
1576 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1577 | */ |
1578 | static | |
1579 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1580 | { | |
3c997079 MD |
1581 | struct lttng_event *event; |
1582 | struct lttng_enabler *enabler; | |
1583 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1584 | |
1585 | switch (cmd) { | |
6dccd6c1 JD |
1586 | case LTTNG_KERNEL_OLD_CONTEXT: |
1587 | { | |
3c997079 MD |
1588 | /* Not implemented */ |
1589 | return -ENOSYS; | |
6dccd6c1 | 1590 | } |
8070f5c0 | 1591 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1592 | { |
3c997079 MD |
1593 | /* Not implemented */ |
1594 | return -ENOSYS; | |
6dccd6c1 JD |
1595 | } |
1596 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1597 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1598 | switch (*evtype) { |
1599 | case LTTNG_TYPE_EVENT: | |
1600 | event = file->private_data; | |
1601 | return lttng_event_enable(event); | |
1602 | case LTTNG_TYPE_ENABLER: | |
1603 | enabler = file->private_data; | |
1604 | return lttng_enabler_enable(enabler); | |
1605 | default: | |
1606 | WARN_ON_ONCE(1); | |
1607 | return -ENOSYS; | |
1608 | } | |
6dccd6c1 | 1609 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1610 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1611 | switch (*evtype) { |
1612 | case LTTNG_TYPE_EVENT: | |
1613 | event = file->private_data; | |
1614 | return lttng_event_disable(event); | |
1615 | case LTTNG_TYPE_ENABLER: | |
1616 | enabler = file->private_data; | |
1617 | return lttng_enabler_disable(enabler); | |
1618 | default: | |
1619 | WARN_ON_ONCE(1); | |
1620 | return -ENOSYS; | |
1621 | } | |
07dfc1d0 MD |
1622 | case LTTNG_KERNEL_FILTER: |
1623 | switch (*evtype) { | |
1624 | case LTTNG_TYPE_EVENT: | |
1625 | return -EINVAL; | |
1626 | case LTTNG_TYPE_ENABLER: | |
1627 | { | |
1628 | enabler = file->private_data; | |
1629 | return lttng_enabler_attach_bytecode(enabler, | |
1630 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1631 | } | |
0586316f MD |
1632 | default: |
1633 | WARN_ON_ONCE(1); | |
1634 | return -ENOSYS; | |
07dfc1d0 | 1635 | } |
3aed4dca FD |
1636 | case LTTNG_KERNEL_ADD_CALLSITE: |
1637 | switch (*evtype) { | |
1638 | case LTTNG_TYPE_EVENT: | |
1639 | event = file->private_data; | |
1640 | return lttng_event_add_callsite(event, | |
1641 | (struct lttng_kernel_event_callsite __user *) arg); | |
1642 | case LTTNG_TYPE_ENABLER: | |
1643 | return -EINVAL; | |
64c147c0 MD |
1644 | default: |
1645 | WARN_ON_ONCE(1); | |
1646 | return -ENOSYS; | |
3aed4dca | 1647 | } |
8070f5c0 MD |
1648 | default: |
1649 | return -ENOIOCTLCMD; | |
1650 | } | |
1651 | } | |
1652 | ||
0a84a57f MD |
1653 | static |
1654 | int lttng_event_release(struct inode *inode, struct file *file) | |
1655 | { | |
3c997079 MD |
1656 | struct lttng_event *event; |
1657 | struct lttng_enabler *enabler; | |
1658 | enum lttng_event_type *evtype = file->private_data; | |
1659 | ||
1660 | if (!evtype) | |
1661 | return 0; | |
1662 | ||
1663 | switch (*evtype) { | |
1664 | case LTTNG_TYPE_EVENT: | |
1665 | event = file->private_data; | |
1666 | if (event) | |
1667 | fput(event->chan->file); | |
1668 | break; | |
1669 | case LTTNG_TYPE_ENABLER: | |
1670 | enabler = file->private_data; | |
1671 | if (enabler) | |
1672 | fput(enabler->chan->file); | |
1673 | break; | |
1674 | default: | |
1675 | WARN_ON_ONCE(1); | |
1676 | break; | |
1677 | } | |
c269fff4 | 1678 | |
0a84a57f MD |
1679 | return 0; |
1680 | } | |
1681 | ||
3b923e5b | 1682 | /* TODO: filter control ioctl */ |
0a84a57f | 1683 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1684 | .owner = THIS_MODULE, |
0a84a57f | 1685 | .release = lttng_event_release, |
8070f5c0 MD |
1686 | .unlocked_ioctl = lttng_event_ioctl, |
1687 | #ifdef CONFIG_COMPAT | |
1688 | .compat_ioctl = lttng_event_ioctl, | |
1689 | #endif | |
11b5a3c2 | 1690 | }; |
0a84a57f | 1691 | |
3b731ab1 JD |
1692 | static int put_u64(uint64_t val, unsigned long arg) |
1693 | { | |
1694 | return put_user(val, (uint64_t __user *) arg); | |
1695 | } | |
1696 | ||
ed8d02d6 JD |
1697 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1698 | unsigned int cmd, unsigned long arg) | |
1699 | { | |
3b731ab1 JD |
1700 | struct lib_ring_buffer *buf = filp->private_data; |
1701 | struct channel *chan = buf->backend.chan; | |
1702 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1703 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1704 | int ret; |
1705 | ||
1706 | if (atomic_read(&chan->record_disabled)) | |
1707 | return -EIO; | |
1708 | ||
ed8d02d6 | 1709 | switch (cmd) { |
3b731ab1 JD |
1710 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1711 | { | |
1712 | uint64_t ts; | |
1713 | ||
dd5a0db3 | 1714 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1715 | if (ret < 0) |
1716 | goto error; | |
1717 | return put_u64(ts, arg); | |
1718 | } | |
1719 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1720 | { | |
1721 | uint64_t ts; | |
1722 | ||
dd5a0db3 | 1723 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1724 | if (ret < 0) |
1725 | goto error; | |
1726 | return put_u64(ts, arg); | |
1727 | } | |
1728 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1729 | { | |
1730 | uint64_t ed; | |
1731 | ||
dd5a0db3 | 1732 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1733 | if (ret < 0) |
1734 | goto error; | |
1735 | return put_u64(ed, arg); | |
1736 | } | |
1737 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1738 | { | |
1739 | uint64_t cs; | |
1740 | ||
dd5a0db3 | 1741 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1742 | if (ret < 0) |
1743 | goto error; | |
1744 | return put_u64(cs, arg); | |
1745 | } | |
1746 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1747 | { | |
1748 | uint64_t ps; | |
1749 | ||
dd5a0db3 | 1750 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1751 | if (ret < 0) |
1752 | goto error; | |
1753 | return put_u64(ps, arg); | |
1754 | } | |
1755 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1756 | { | |
1757 | uint64_t si; | |
1758 | ||
dd5a0db3 | 1759 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1760 | if (ret < 0) |
1761 | goto error; | |
1762 | return put_u64(si, arg); | |
1763 | } | |
2348ca17 JD |
1764 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1765 | { | |
1766 | uint64_t ts; | |
1767 | ||
dd5a0db3 | 1768 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1769 | if (ret < 0) |
1770 | goto error; | |
1771 | return put_u64(ts, arg); | |
1772 | } | |
5b3cf4f9 JD |
1773 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1774 | { | |
1775 | uint64_t seq; | |
1776 | ||
1777 | ret = ops->sequence_number(config, buf, &seq); | |
1778 | if (ret < 0) | |
1779 | goto error; | |
1780 | return put_u64(seq, arg); | |
1781 | } | |
5594698f JD |
1782 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1783 | { | |
1784 | uint64_t id; | |
1785 | ||
1786 | ret = ops->instance_id(config, buf, &id); | |
1787 | if (ret < 0) | |
1788 | goto error; | |
1789 | return put_u64(id, arg); | |
1790 | } | |
3b731ab1 JD |
1791 | default: |
1792 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1793 | cmd, arg); | |
ed8d02d6 | 1794 | } |
3b731ab1 JD |
1795 | |
1796 | error: | |
1797 | return -ENOSYS; | |
ed8d02d6 JD |
1798 | } |
1799 | ||
1800 | #ifdef CONFIG_COMPAT | |
1801 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1802 | unsigned int cmd, unsigned long arg) | |
1803 | { | |
3b731ab1 JD |
1804 | struct lib_ring_buffer *buf = filp->private_data; |
1805 | struct channel *chan = buf->backend.chan; | |
1806 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1807 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1808 | int ret; |
1809 | ||
1810 | if (atomic_read(&chan->record_disabled)) | |
1811 | return -EIO; | |
1812 | ||
ed8d02d6 | 1813 | switch (cmd) { |
3b731ab1 JD |
1814 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1815 | { | |
1816 | uint64_t ts; | |
1817 | ||
dd5a0db3 | 1818 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1819 | if (ret < 0) |
1820 | goto error; | |
1821 | return put_u64(ts, arg); | |
1822 | } | |
1823 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1824 | { | |
1825 | uint64_t ts; | |
1826 | ||
dd5a0db3 | 1827 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1828 | if (ret < 0) |
1829 | goto error; | |
1830 | return put_u64(ts, arg); | |
1831 | } | |
1832 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1833 | { | |
1834 | uint64_t ed; | |
1835 | ||
dd5a0db3 | 1836 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1837 | if (ret < 0) |
1838 | goto error; | |
1839 | return put_u64(ed, arg); | |
ed8d02d6 | 1840 | } |
3b731ab1 JD |
1841 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1842 | { | |
1843 | uint64_t cs; | |
1844 | ||
dd5a0db3 | 1845 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1846 | if (ret < 0) |
1847 | goto error; | |
1848 | return put_u64(cs, arg); | |
1849 | } | |
1850 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1851 | { | |
1852 | uint64_t ps; | |
1853 | ||
dd5a0db3 | 1854 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1855 | if (ret < 0) |
1856 | goto error; | |
1857 | return put_u64(ps, arg); | |
1858 | } | |
1859 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1860 | { | |
1861 | uint64_t si; | |
1862 | ||
dd5a0db3 | 1863 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1864 | if (ret < 0) |
1865 | goto error; | |
1866 | return put_u64(si, arg); | |
1867 | } | |
2348ca17 JD |
1868 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1869 | { | |
1870 | uint64_t ts; | |
1871 | ||
dd5a0db3 | 1872 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1873 | if (ret < 0) |
1874 | goto error; | |
1875 | return put_u64(ts, arg); | |
1876 | } | |
5b3cf4f9 JD |
1877 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
1878 | { | |
1879 | uint64_t seq; | |
1880 | ||
1881 | ret = ops->sequence_number(config, buf, &seq); | |
1882 | if (ret < 0) | |
1883 | goto error; | |
1884 | return put_u64(seq, arg); | |
1885 | } | |
5594698f JD |
1886 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
1887 | { | |
1888 | uint64_t id; | |
1889 | ||
1890 | ret = ops->instance_id(config, buf, &id); | |
1891 | if (ret < 0) | |
1892 | goto error; | |
1893 | return put_u64(id, arg); | |
1894 | } | |
3b731ab1 JD |
1895 | default: |
1896 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1897 | cmd, arg); | |
1898 | } | |
1899 | ||
1900 | error: | |
1901 | return -ENOSYS; | |
ed8d02d6 JD |
1902 | } |
1903 | #endif /* CONFIG_COMPAT */ | |
1904 | ||
1905 | static void lttng_stream_override_ring_buffer_fops(void) | |
1906 | { | |
1907 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1908 | lttng_stream_ring_buffer_file_operations.open = | |
1909 | lib_ring_buffer_file_operations.open; | |
1910 | lttng_stream_ring_buffer_file_operations.release = | |
1911 | lib_ring_buffer_file_operations.release; | |
1912 | lttng_stream_ring_buffer_file_operations.poll = | |
1913 | lib_ring_buffer_file_operations.poll; | |
1914 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1915 | lib_ring_buffer_file_operations.splice_read; | |
1916 | lttng_stream_ring_buffer_file_operations.mmap = | |
1917 | lib_ring_buffer_file_operations.mmap; | |
1918 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1919 | lttng_stream_ring_buffer_ioctl; | |
1920 | lttng_stream_ring_buffer_file_operations.llseek = | |
1921 | lib_ring_buffer_file_operations.llseek; | |
1922 | #ifdef CONFIG_COMPAT | |
1923 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1924 | lttng_stream_ring_buffer_compat_ioctl; | |
1925 | #endif | |
1926 | } | |
1927 | ||
80996790 | 1928 | int __init lttng_abi_init(void) |
baf20995 MD |
1929 | { |
1930 | int ret = 0; | |
1931 | ||
2754583e | 1932 | lttng_clock_ref(); |
f771eda6 JD |
1933 | |
1934 | ret = lttng_tp_mempool_init(); | |
1935 | if (ret) { | |
1936 | goto error; | |
1937 | } | |
1938 | ||
d29348f7 | 1939 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
059de147 | 1940 | <tng_proc_ops, NULL); |
2470a237 | 1941 | |
255e52a4 | 1942 | if (!lttng_proc_dentry) { |
baf20995 MD |
1943 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1944 | ret = -ENOMEM; | |
1945 | goto error; | |
1946 | } | |
ed8d02d6 | 1947 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 1948 | return 0; |
ed8d02d6 | 1949 | |
baf20995 | 1950 | error: |
f771eda6 | 1951 | lttng_tp_mempool_destroy(); |
2754583e | 1952 | lttng_clock_unref(); |
baf20995 MD |
1953 | return ret; |
1954 | } | |
1955 | ||
e6e65fcd MD |
1956 | /* No __exit annotation because used by init error path too. */ |
1957 | void lttng_abi_exit(void) | |
baf20995 | 1958 | { |
f771eda6 | 1959 | lttng_tp_mempool_destroy(); |
2754583e | 1960 | lttng_clock_unref(); |
e6a17f26 MD |
1961 | if (lttng_proc_dentry) |
1962 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1963 | } |