Commit | Line | Data |
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9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
e8951e63 | 3 | * lttng-abi.c |
baf20995 | 4 | * |
e8951e63 | 5 | * LTTng ABI |
baf20995 | 6 | * |
886d51a3 MD |
7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
8 | * | |
baf20995 MD |
9 | * Mimic system calls for: |
10 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
11 | * - channel creation, returns a file descriptor or failure. |
12 | * - Operates on a session file descriptor | |
13 | * - Takes all channel options as parameters. | |
14 | * - stream get, returns a file descriptor or failure. | |
15 | * - Operates on a channel file descriptor. | |
16 | * - stream notifier get, returns a file descriptor or failure. | |
17 | * - Operates on a channel file descriptor. | |
18 | * - event creation, returns a file descriptor or failure. | |
19 | * - Operates on a channel file descriptor | |
20 | * - Takes an event name as parameter | |
21 | * - Takes an instrumentation source as parameter | |
22 | * - e.g. tracepoints, dynamic_probes... | |
23 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
24 | */ |
25 | ||
11b5a3c2 | 26 | #include <linux/module.h> |
e6a17f26 | 27 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
28 | #include <linux/anon_inodes.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <linux/slab.h> | |
abc0446a | 32 | #include <linux/err.h> |
1d00109f | 33 | #include <wrapper/compiler_attributes.h> |
ea53823c | 34 | #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */ |
241ae9a8 MD |
35 | #include <wrapper/ringbuffer/vfs.h> |
36 | #include <wrapper/ringbuffer/backend.h> | |
37 | #include <wrapper/ringbuffer/frontend.h> | |
38 | #include <wrapper/poll.h> | |
39 | #include <wrapper/file.h> | |
40 | #include <wrapper/kref.h> | |
4993071a | 41 | #include <lttng-string-utils.h> |
241ae9a8 MD |
42 | #include <lttng-abi.h> |
43 | #include <lttng-abi-old.h> | |
44 | #include <lttng-events.h> | |
45 | #include <lttng-tracer.h> | |
f771eda6 | 46 | #include <lttng-tp-mempool.h> |
241ae9a8 | 47 | #include <lib/ringbuffer/frontend_types.h> |
baf20995 MD |
48 | |
49 | /* | |
50 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 51 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
52 | */ |
53 | ||
e6a17f26 | 54 | static struct proc_dir_entry *lttng_proc_dentry; |
122ba89c | 55 | |
2d042821 | 56 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
122ba89c MJ |
57 | static const struct proc_ops lttng_proc_ops; |
58 | #else | |
59 | static const struct file_operations lttng_proc_ops; | |
60 | #endif | |
61 | ||
ad1c05e1 MD |
62 | static const struct file_operations lttng_session_fops; |
63 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 64 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 65 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 66 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 67 | |
9616f0bf | 68 | static int put_u64(uint64_t val, unsigned long arg); |
122c63cb | 69 | static int put_u32(uint32_t val, unsigned long arg); |
9616f0bf | 70 | |
a33c9927 MD |
71 | /* |
72 | * Teardown management: opened file descriptors keep a refcount on the module, | |
73 | * so it can only exit when all file descriptors are closed. | |
74 | */ | |
75 | ||
ad1c05e1 | 76 | static |
baf20995 MD |
77 | int lttng_abi_create_session(void) |
78 | { | |
a90917c3 | 79 | struct lttng_session *session; |
c0e31d2e | 80 | struct file *session_file; |
11b5a3c2 | 81 | int session_fd, ret; |
baf20995 | 82 | |
a90917c3 | 83 | session = lttng_session_create(); |
baf20995 MD |
84 | if (!session) |
85 | return -ENOMEM; | |
4ac10b76 | 86 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
87 | if (session_fd < 0) { |
88 | ret = session_fd; | |
89 | goto fd_error; | |
90 | } | |
c0e31d2e | 91 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 92 | <tng_session_fops, |
baf20995 | 93 | session, O_RDWR); |
c0e31d2e MD |
94 | if (IS_ERR(session_file)) { |
95 | ret = PTR_ERR(session_file); | |
baf20995 MD |
96 | goto file_error; |
97 | } | |
c0e31d2e MD |
98 | session->file = session_file; |
99 | fd_install(session_fd, session_file); | |
baf20995 MD |
100 | return session_fd; |
101 | ||
102 | file_error: | |
103 | put_unused_fd(session_fd); | |
104 | fd_error: | |
a90917c3 | 105 | lttng_session_destroy(session); |
baf20995 MD |
106 | return ret; |
107 | } | |
108 | ||
271b6681 MD |
109 | static |
110 | int lttng_abi_tracepoint_list(void) | |
111 | { | |
112 | struct file *tracepoint_list_file; | |
113 | int file_fd, ret; | |
114 | ||
4ac10b76 | 115 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
116 | if (file_fd < 0) { |
117 | ret = file_fd; | |
118 | goto fd_error; | |
119 | } | |
30f18bf0 | 120 | |
8ee099b6 | 121 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
122 | <tng_tracepoint_list_fops, |
123 | NULL, O_RDWR); | |
124 | if (IS_ERR(tracepoint_list_file)) { | |
125 | ret = PTR_ERR(tracepoint_list_file); | |
126 | goto file_error; | |
127 | } | |
30f18bf0 MD |
128 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
129 | if (ret < 0) | |
130 | goto open_error; | |
271b6681 MD |
131 | fd_install(file_fd, tracepoint_list_file); |
132 | return file_fd; | |
133 | ||
30f18bf0 MD |
134 | open_error: |
135 | fput(tracepoint_list_file); | |
271b6681 MD |
136 | file_error: |
137 | put_unused_fd(file_fd); | |
138 | fd_error: | |
139 | return ret; | |
140 | } | |
141 | ||
f127e61e MD |
142 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
143 | static inline | |
144 | int lttng_abi_syscall_list(void) | |
145 | { | |
146 | return -ENOSYS; | |
147 | } | |
148 | #else | |
149 | static | |
150 | int lttng_abi_syscall_list(void) | |
151 | { | |
152 | struct file *syscall_list_file; | |
153 | int file_fd, ret; | |
154 | ||
155 | file_fd = lttng_get_unused_fd(); | |
156 | if (file_fd < 0) { | |
157 | ret = file_fd; | |
158 | goto fd_error; | |
159 | } | |
160 | ||
161 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
162 | <tng_syscall_list_fops, | |
163 | NULL, O_RDWR); | |
164 | if (IS_ERR(syscall_list_file)) { | |
165 | ret = PTR_ERR(syscall_list_file); | |
166 | goto file_error; | |
167 | } | |
168 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
169 | if (ret < 0) | |
170 | goto open_error; | |
171 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
172 | return file_fd; |
173 | ||
174 | open_error: | |
175 | fput(syscall_list_file); | |
176 | file_error: | |
177 | put_unused_fd(file_fd); | |
178 | fd_error: | |
179 | return ret; | |
180 | } | |
181 | #endif | |
182 | ||
80c16bcf | 183 | static |
6dccd6c1 | 184 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 185 | { |
6dccd6c1 JD |
186 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
187 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
188 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
189 | } |
190 | ||
42cabb80 MD |
191 | static |
192 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
193 | { | |
194 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
195 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
196 | } | |
197 | ||
8070f5c0 MD |
198 | static |
199 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 200 | struct lttng_kernel_context *context_param, |
a90917c3 | 201 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 202 | { |
8070f5c0 MD |
203 | |
204 | if (session->been_active) | |
205 | return -EPERM; | |
206 | ||
6dccd6c1 | 207 | switch (context_param->ctx) { |
12a313a5 | 208 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 209 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
210 | case LTTNG_KERNEL_CONTEXT_PRIO: |
211 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
212 | case LTTNG_KERNEL_CONTEXT_NICE: |
213 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
214 | case LTTNG_KERNEL_CONTEXT_VPID: |
215 | return lttng_add_vpid_to_ctx(ctx); | |
216 | case LTTNG_KERNEL_CONTEXT_TID: | |
217 | return lttng_add_tid_to_ctx(ctx); | |
218 | case LTTNG_KERNEL_CONTEXT_VTID: | |
219 | return lttng_add_vtid_to_ctx(ctx); | |
220 | case LTTNG_KERNEL_CONTEXT_PPID: | |
221 | return lttng_add_ppid_to_ctx(ctx); | |
222 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
223 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 224 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
225 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
226 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
227 | context_param->u.perf_counter.config, | |
228 | context_param->u.perf_counter.name, | |
c24a0d71 | 229 | ctx); |
a2563e83 MD |
230 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
231 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
232 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
233 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
234 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
235 | return lttng_add_cpu_id_to_ctx(ctx); | |
79150a49 JD |
236 | case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE: |
237 | return lttng_add_interruptible_to_ctx(ctx); | |
238 | case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE: | |
239 | return lttng_add_need_reschedule_to_ctx(ctx); | |
240 | case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE: | |
241 | return lttng_add_preemptible_to_ctx(ctx); | |
242 | case LTTNG_KERNEL_CONTEXT_MIGRATABLE: | |
243 | return lttng_add_migratable_to_ctx(ctx); | |
2fa2d39a FG |
244 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL: |
245 | case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER: | |
246 | return lttng_add_callstack_to_ctx(ctx, context_param->ctx); | |
a6cf40a4 MJ |
247 | case LTTNG_KERNEL_CONTEXT_CGROUP_NS: |
248 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
249 | case LTTNG_KERNEL_CONTEXT_IPC_NS: | |
250 | return lttng_add_ipc_ns_to_ctx(ctx); | |
251 | case LTTNG_KERNEL_CONTEXT_MNT_NS: | |
252 | return lttng_add_mnt_ns_to_ctx(ctx); | |
253 | case LTTNG_KERNEL_CONTEXT_NET_NS: | |
254 | return lttng_add_net_ns_to_ctx(ctx); | |
255 | case LTTNG_KERNEL_CONTEXT_PID_NS: | |
256 | return lttng_add_pid_ns_to_ctx(ctx); | |
257 | case LTTNG_KERNEL_CONTEXT_USER_NS: | |
258 | return lttng_add_user_ns_to_ctx(ctx); | |
259 | case LTTNG_KERNEL_CONTEXT_UTS_NS: | |
260 | return lttng_add_uts_ns_to_ctx(ctx); | |
dc923e75 MJ |
261 | case LTTNG_KERNEL_CONTEXT_UID: |
262 | return lttng_add_uid_to_ctx(ctx); | |
263 | case LTTNG_KERNEL_CONTEXT_EUID: | |
264 | return lttng_add_euid_to_ctx(ctx); | |
265 | case LTTNG_KERNEL_CONTEXT_SUID: | |
266 | return lttng_add_suid_to_ctx(ctx); | |
267 | case LTTNG_KERNEL_CONTEXT_GID: | |
268 | return lttng_add_gid_to_ctx(ctx); | |
269 | case LTTNG_KERNEL_CONTEXT_EGID: | |
270 | return lttng_add_egid_to_ctx(ctx); | |
271 | case LTTNG_KERNEL_CONTEXT_SGID: | |
272 | return lttng_add_sgid_to_ctx(ctx); | |
273 | case LTTNG_KERNEL_CONTEXT_VUID: | |
274 | return lttng_add_vuid_to_ctx(ctx); | |
275 | case LTTNG_KERNEL_CONTEXT_VEUID: | |
276 | return lttng_add_veuid_to_ctx(ctx); | |
277 | case LTTNG_KERNEL_CONTEXT_VSUID: | |
278 | return lttng_add_vsuid_to_ctx(ctx); | |
279 | case LTTNG_KERNEL_CONTEXT_VGID: | |
280 | return lttng_add_vgid_to_ctx(ctx); | |
281 | case LTTNG_KERNEL_CONTEXT_VEGID: | |
282 | return lttng_add_vegid_to_ctx(ctx); | |
283 | case LTTNG_KERNEL_CONTEXT_VSGID: | |
284 | return lttng_add_vsgid_to_ctx(ctx); | |
8070f5c0 MD |
285 | default: |
286 | return -EINVAL; | |
287 | } | |
288 | } | |
289 | ||
ad1c05e1 MD |
290 | /** |
291 | * lttng_ioctl - lttng syscall through ioctl | |
292 | * | |
c0e31d2e | 293 | * @file: the file |
ad1c05e1 MD |
294 | * @cmd: the command |
295 | * @arg: command arg | |
296 | * | |
297 | * This ioctl implements lttng commands: | |
38d024ae | 298 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 299 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
300 | * LTTNG_KERNEL_TRACER_VERSION |
301 | * Returns the LTTng kernel tracer version | |
302 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
303 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
304 | * LTTNG_KERNEL_WAIT_QUIESCENT |
305 | * Returns after all previously running probes have completed | |
42cabb80 MD |
306 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
307 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
308 | * |
309 | * The returned session will be deleted when its file descriptor is closed. | |
310 | */ | |
311 | static | |
c0e31d2e | 312 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
313 | { |
314 | switch (cmd) { | |
6dccd6c1 | 315 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 316 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 317 | return lttng_abi_create_session(); |
6dccd6c1 JD |
318 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
319 | { | |
320 | struct lttng_kernel_tracer_version v; | |
321 | struct lttng_kernel_old_tracer_version oldv; | |
322 | struct lttng_kernel_old_tracer_version *uversion = | |
323 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
324 | ||
325 | lttng_abi_tracer_version(&v); | |
326 | oldv.major = v.major; | |
327 | oldv.minor = v.minor; | |
328 | oldv.patchlevel = v.patchlevel; | |
329 | ||
330 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
331 | return -EFAULT; | |
332 | return 0; | |
333 | } | |
80c16bcf | 334 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
335 | { |
336 | struct lttng_kernel_tracer_version version; | |
337 | struct lttng_kernel_tracer_version *uversion = | |
338 | (struct lttng_kernel_tracer_version __user *) arg; | |
339 | ||
340 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
341 | |
342 | if (copy_to_user(uversion, &version, sizeof(version))) | |
343 | return -EFAULT; | |
344 | return 0; | |
345 | } | |
346 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
347 | { | |
348 | struct lttng_kernel_tracer_abi_version version; | |
349 | struct lttng_kernel_tracer_abi_version *uversion = | |
350 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
351 | ||
352 | lttng_abi_tracer_abi_version(&version); | |
353 | ||
6dccd6c1 JD |
354 | if (copy_to_user(uversion, &version, sizeof(version))) |
355 | return -EFAULT; | |
356 | return 0; | |
357 | } | |
358 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
359 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
360 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
361 | case LTTNG_KERNEL_SYSCALL_LIST: |
362 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 363 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
364 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
365 | synchronize_trace(); | |
366 | return 0; | |
6dccd6c1 JD |
367 | case LTTNG_KERNEL_OLD_CALIBRATE: |
368 | { | |
369 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
370 | (struct lttng_kernel_old_calibrate __user *) arg; | |
371 | struct lttng_kernel_old_calibrate old_calibrate; | |
372 | struct lttng_kernel_calibrate calibrate; | |
373 | int ret; | |
374 | ||
375 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
376 | return -EFAULT; | |
377 | calibrate.type = old_calibrate.type; | |
378 | ret = lttng_calibrate(&calibrate); | |
379 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
380 | return -EFAULT; | |
381 | return ret; | |
382 | } | |
57105fc2 MD |
383 | case LTTNG_KERNEL_CALIBRATE: |
384 | { | |
3db41b2c MD |
385 | struct lttng_kernel_calibrate __user *ucalibrate = |
386 | (struct lttng_kernel_calibrate __user *) arg; | |
387 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
388 | int ret; |
389 | ||
390 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
391 | return -EFAULT; | |
392 | ret = lttng_calibrate(&calibrate); | |
393 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
394 | return -EFAULT; | |
395 | return ret; | |
396 | } | |
ad1c05e1 MD |
397 | default: |
398 | return -ENOIOCTLCMD; | |
399 | } | |
400 | } | |
401 | ||
2d042821 | 402 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
122ba89c MJ |
403 | static const struct proc_ops lttng_proc_ops = { |
404 | .proc_ioctl = lttng_ioctl, | |
405 | #ifdef CONFIG_COMPAT | |
406 | .proc_compat_ioctl = lttng_ioctl, | |
407 | #endif /* CONFIG_COMPAT */ | |
408 | }; | |
409 | #else | |
410 | static const struct file_operations lttng_proc_ops = { | |
a33c9927 | 411 | .owner = THIS_MODULE, |
ad1c05e1 MD |
412 | .unlocked_ioctl = lttng_ioctl, |
413 | #ifdef CONFIG_COMPAT | |
03037b98 | 414 | .compat_ioctl = lttng_ioctl, |
122ba89c | 415 | #endif /* CONFIG_COMPAT */ |
11b5a3c2 | 416 | }; |
122ba89c | 417 | #endif |
ad1c05e1 | 418 | |
5dbbdb43 | 419 | static |
c0e31d2e | 420 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 421 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 422 | enum channel_type channel_type) |
baf20995 | 423 | { |
a90917c3 | 424 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 425 | const struct file_operations *fops = NULL; |
5dbbdb43 | 426 | const char *transport_name; |
a90917c3 | 427 | struct lttng_channel *chan; |
c0e31d2e | 428 | struct file *chan_file; |
baf20995 | 429 | int chan_fd; |
ad1c05e1 | 430 | int ret = 0; |
baf20995 | 431 | |
4ac10b76 | 432 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
433 | if (chan_fd < 0) { |
434 | ret = chan_fd; | |
435 | goto fd_error; | |
436 | } | |
88dfd899 MD |
437 | switch (channel_type) { |
438 | case PER_CPU_CHANNEL: | |
439 | fops = <tng_channel_fops; | |
440 | break; | |
441 | case METADATA_CHANNEL: | |
442 | fops = <tng_metadata_fops; | |
443 | break; | |
444 | } | |
2470a237 | 445 | |
c0e31d2e | 446 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 447 | fops, |
03037b98 | 448 | NULL, O_RDWR); |
c0e31d2e MD |
449 | if (IS_ERR(chan_file)) { |
450 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
451 | goto file_error; |
452 | } | |
5dbbdb43 MD |
453 | switch (channel_type) { |
454 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
455 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
456 | transport_name = chan_param->overwrite ? | |
96ba7208 | 457 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
458 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
459 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
460 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
461 | } else { | |
462 | return -EINVAL; | |
463 | } | |
5dbbdb43 | 464 | break; |
5dbbdb43 | 465 | case METADATA_CHANNEL: |
6dccd6c1 | 466 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 467 | transport_name = "relay-metadata"; |
6dccd6c1 | 468 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
469 | transport_name = "relay-metadata-mmap"; |
470 | else | |
471 | return -EINVAL; | |
5dbbdb43 MD |
472 | break; |
473 | default: | |
474 | transport_name = "<unknown>"; | |
475 | break; | |
476 | } | |
98d7281c MJ |
477 | if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) { |
478 | ret = -EOVERFLOW; | |
9c1f4643 MD |
479 | goto refcount_error; |
480 | } | |
03037b98 MD |
481 | /* |
482 | * We tolerate no failure path after channel creation. It will stay | |
483 | * invariant for the rest of the session. | |
484 | */ | |
a90917c3 | 485 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
486 | chan_param->subbuf_size, |
487 | chan_param->num_subbuf, | |
488 | chan_param->switch_timer_interval, | |
d83004aa JD |
489 | chan_param->read_timer_interval, |
490 | channel_type); | |
03037b98 | 491 | if (!chan) { |
f3d01b96 | 492 | ret = -EINVAL; |
03037b98 MD |
493 | goto chan_error; |
494 | } | |
11b5a3c2 | 495 | chan->file = chan_file; |
c0e31d2e MD |
496 | chan_file->private_data = chan; |
497 | fd_install(chan_fd, chan_file); | |
ad1c05e1 | 498 | |
baf20995 MD |
499 | return chan_fd; |
500 | ||
03037b98 | 501 | chan_error: |
9c1f4643 MD |
502 | atomic_long_dec(&session_file->f_count); |
503 | refcount_error: | |
c0e31d2e | 504 | fput(chan_file); |
baf20995 MD |
505 | file_error: |
506 | put_unused_fd(chan_fd); | |
507 | fd_error: | |
baf20995 MD |
508 | return ret; |
509 | } | |
510 | ||
7f859fbf JR |
511 | static |
512 | int lttng_abi_session_set_name(struct lttng_session *session, | |
513 | struct lttng_kernel_session_name *name) | |
514 | { | |
515 | size_t len; | |
516 | ||
517 | len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN); | |
518 | ||
519 | if (len == LTTNG_KERNEL_SESSION_NAME_LEN) { | |
520 | /* Name is too long/malformed */ | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | strcpy(session->name, name->name); | |
525 | return 0; | |
526 | } | |
527 | ||
1c88f269 JR |
528 | static |
529 | int lttng_abi_session_set_creation_time(struct lttng_session *session, | |
530 | struct lttng_kernel_session_creation_time *time) | |
531 | { | |
532 | size_t len; | |
533 | ||
534 | len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN); | |
535 | ||
536 | if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) { | |
537 | /* Time is too long/malformed */ | |
538 | return -EINVAL; | |
539 | } | |
540 | ||
541 | strcpy(session->creation_time, time->iso8601); | |
542 | return 0; | |
543 | } | |
544 | ||
d1f652f8 MD |
545 | static |
546 | enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker) | |
547 | { | |
548 | switch (tracker->type) { | |
549 | case LTTNG_KERNEL_TRACKER_PID: | |
550 | return TRACKER_PID; | |
551 | case LTTNG_KERNEL_TRACKER_VPID: | |
552 | return TRACKER_VPID; | |
553 | case LTTNG_KERNEL_TRACKER_UID: | |
554 | return TRACKER_UID; | |
555 | case LTTNG_KERNEL_TRACKER_VUID: | |
556 | return TRACKER_VUID; | |
557 | case LTTNG_KERNEL_TRACKER_GID: | |
558 | return TRACKER_GID; | |
559 | case LTTNG_KERNEL_TRACKER_VGID: | |
560 | return TRACKER_VGID; | |
561 | default: | |
562 | return TRACKER_UNKNOWN; | |
563 | } | |
564 | } | |
565 | ||
baf20995 | 566 | /** |
ad1c05e1 | 567 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 568 | * |
c0e31d2e | 569 | * @file: the file |
baf20995 MD |
570 | * @cmd: the command |
571 | * @arg: command arg | |
572 | * | |
573 | * This ioctl implements lttng commands: | |
38d024ae | 574 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 575 | * Returns a LTTng channel file descriptor |
e64957da MD |
576 | * LTTNG_KERNEL_ENABLE |
577 | * Enables tracing for a session (weak enable) | |
578 | * LTTNG_KERNEL_DISABLE | |
579 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
580 | * LTTNG_KERNEL_METADATA |
581 | * Returns a LTTng metadata file descriptor | |
e0130fab | 582 | * LTTNG_KERNEL_SESSION_TRACK_PID |
d1f652f8 | 583 | * Add PID to session PID tracker |
e0130fab | 584 | * LTTNG_KERNEL_SESSION_UNTRACK_PID |
d1f652f8 MD |
585 | * Remove PID from session PID tracker |
586 | * LTTNG_KERNEL_SESSION_TRACK_ID | |
587 | * Add ID to tracker | |
588 | * LTTNG_KERNEL_SESSION_UNTRACK_ID | |
589 | * Remove ID from tracker | |
ad1c05e1 MD |
590 | * |
591 | * The returned channel will be deleted when its file descriptor is closed. | |
592 | */ | |
593 | static | |
c0e31d2e | 594 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 595 | { |
a90917c3 | 596 | struct lttng_session *session = file->private_data; |
2d4c4d15 MD |
597 | struct lttng_kernel_channel chan_param; |
598 | struct lttng_kernel_old_channel old_chan_param; | |
c0e31d2e | 599 | |
ad1c05e1 | 600 | switch (cmd) { |
6dccd6c1 JD |
601 | case LTTNG_KERNEL_OLD_CHANNEL: |
602 | { | |
6dccd6c1 JD |
603 | if (copy_from_user(&old_chan_param, |
604 | (struct lttng_kernel_old_channel __user *) arg, | |
605 | sizeof(struct lttng_kernel_old_channel))) | |
606 | return -EFAULT; | |
607 | chan_param.overwrite = old_chan_param.overwrite; | |
608 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
609 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
610 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
611 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
612 | chan_param.output = old_chan_param.output; | |
613 | ||
614 | return lttng_abi_create_channel(file, &chan_param, | |
615 | PER_CPU_CHANNEL); | |
616 | } | |
38d024ae | 617 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 | 618 | { |
6dccd6c1 | 619 | if (copy_from_user(&chan_param, |
38d024ae | 620 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
621 | sizeof(struct lttng_kernel_channel))) |
622 | return -EFAULT; | |
623 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 624 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
625 | } |
626 | case LTTNG_KERNEL_OLD_SESSION_START: | |
627 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 628 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 629 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 630 | return lttng_session_enable(session); |
6dccd6c1 JD |
631 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
632 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 633 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 634 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 635 | return lttng_session_disable(session); |
6dccd6c1 JD |
636 | case LTTNG_KERNEL_OLD_METADATA: |
637 | { | |
6dccd6c1 JD |
638 | if (copy_from_user(&old_chan_param, |
639 | (struct lttng_kernel_old_channel __user *) arg, | |
640 | sizeof(struct lttng_kernel_old_channel))) | |
641 | return -EFAULT; | |
642 | chan_param.overwrite = old_chan_param.overwrite; | |
643 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
644 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
645 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
646 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
647 | chan_param.output = old_chan_param.output; | |
648 | ||
649 | return lttng_abi_create_channel(file, &chan_param, | |
650 | METADATA_CHANNEL); | |
651 | } | |
38d024ae | 652 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 | 653 | { |
6dccd6c1 JD |
654 | if (copy_from_user(&chan_param, |
655 | (struct lttng_kernel_channel __user *) arg, | |
656 | sizeof(struct lttng_kernel_channel))) | |
657 | return -EFAULT; | |
658 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 659 | METADATA_CHANNEL); |
6dccd6c1 | 660 | } |
e0130fab | 661 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
d1f652f8 | 662 | return lttng_session_track_id(session, TRACKER_PID, (int) arg); |
e0130fab | 663 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: |
d1f652f8 MD |
664 | return lttng_session_untrack_id(session, TRACKER_PID, (int) arg); |
665 | case LTTNG_KERNEL_SESSION_TRACK_ID: | |
666 | { | |
667 | struct lttng_kernel_tracker_args tracker; | |
668 | enum tracker_type tracker_type; | |
669 | ||
670 | if (copy_from_user(&tracker, | |
671 | (struct lttng_kernel_tracker_args __user *) arg, | |
672 | sizeof(struct lttng_kernel_tracker_args))) | |
673 | return -EFAULT; | |
674 | tracker_type = get_tracker_type(&tracker); | |
675 | if (tracker_type == TRACKER_UNKNOWN) | |
676 | return -EINVAL; | |
677 | return lttng_session_track_id(session, tracker_type, tracker.id); | |
678 | } | |
679 | case LTTNG_KERNEL_SESSION_UNTRACK_ID: | |
680 | { | |
681 | struct lttng_kernel_tracker_args tracker; | |
682 | enum tracker_type tracker_type; | |
683 | ||
684 | if (copy_from_user(&tracker, | |
685 | (struct lttng_kernel_tracker_args __user *) arg, | |
686 | sizeof(struct lttng_kernel_tracker_args))) | |
687 | return -EFAULT; | |
688 | tracker_type = get_tracker_type(&tracker); | |
689 | if (tracker_type == TRACKER_UNKNOWN) | |
690 | return -EINVAL; | |
691 | return lttng_session_untrack_id(session, tracker_type, | |
692 | tracker.id); | |
693 | } | |
7e6f9ef6 | 694 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
d1f652f8 MD |
695 | return lttng_session_list_tracker_ids(session, TRACKER_PID); |
696 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS: | |
697 | { | |
698 | struct lttng_kernel_tracker_args tracker; | |
699 | enum tracker_type tracker_type; | |
700 | ||
701 | if (copy_from_user(&tracker, | |
702 | (struct lttng_kernel_tracker_args __user *) arg, | |
703 | sizeof(struct lttng_kernel_tracker_args))) | |
704 | return -EFAULT; | |
705 | tracker_type = get_tracker_type(&tracker); | |
706 | if (tracker_type == TRACKER_UNKNOWN) | |
707 | return -EINVAL; | |
708 | return lttng_session_list_tracker_ids(session, tracker_type); | |
709 | } | |
9616f0bf JD |
710 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
711 | return lttng_session_metadata_regenerate(session); | |
601252cf MD |
712 | case LTTNG_KERNEL_SESSION_STATEDUMP: |
713 | return lttng_session_statedump(session); | |
7f859fbf JR |
714 | case LTTNG_KERNEL_SESSION_SET_NAME: |
715 | { | |
716 | struct lttng_kernel_session_name name; | |
717 | ||
718 | if (copy_from_user(&name, | |
719 | (struct lttng_kernel_session_name __user *) arg, | |
720 | sizeof(struct lttng_kernel_session_name))) | |
721 | return -EFAULT; | |
722 | return lttng_abi_session_set_name(session, &name); | |
723 | } | |
1c88f269 JR |
724 | case LTTNG_KERNEL_SESSION_SET_CREATION_TIME: |
725 | { | |
726 | struct lttng_kernel_session_creation_time time; | |
727 | ||
728 | if (copy_from_user(&time, | |
729 | (struct lttng_kernel_session_creation_time __user *) arg, | |
730 | sizeof(struct lttng_kernel_session_creation_time))) | |
731 | return -EFAULT; | |
732 | return lttng_abi_session_set_creation_time(session, &time); | |
733 | } | |
ad1c05e1 MD |
734 | default: |
735 | return -ENOIOCTLCMD; | |
736 | } | |
737 | } | |
738 | ||
03037b98 MD |
739 | /* |
740 | * Called when the last file reference is dropped. | |
741 | * | |
742 | * Big fat note: channels and events are invariant for the whole session after | |
743 | * their creation. So this session destruction also destroys all channel and | |
744 | * event structures specific to this session (they are not destroyed when their | |
745 | * individual file is released). | |
746 | */ | |
ad1c05e1 | 747 | static |
03037b98 | 748 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 749 | { |
a90917c3 | 750 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
751 | |
752 | if (session) | |
a90917c3 | 753 | lttng_session_destroy(session); |
11b5a3c2 | 754 | return 0; |
ad1c05e1 | 755 | } |
ad1c05e1 MD |
756 | |
757 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 758 | .owner = THIS_MODULE, |
03037b98 | 759 | .release = lttng_session_release, |
ad1c05e1 MD |
760 | .unlocked_ioctl = lttng_session_ioctl, |
761 | #ifdef CONFIG_COMPAT | |
03037b98 | 762 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 763 | #endif |
11b5a3c2 | 764 | }; |
ad1c05e1 | 765 | |
d83004aa JD |
766 | /** |
767 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
768 | * @filp: the file | |
769 | * @wait: poll table | |
770 | * | |
771 | * Handles the poll operations for the metadata channels. | |
772 | */ | |
ad1c05e1 | 773 | static |
d83004aa JD |
774 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
775 | poll_table *wait) | |
776 | { | |
777 | struct lttng_metadata_stream *stream = filp->private_data; | |
778 | struct lib_ring_buffer *buf = stream->priv; | |
779 | int finalized; | |
780 | unsigned int mask = 0; | |
781 | ||
782 | if (filp->f_mode & FMODE_READ) { | |
783 | poll_wait_set_exclusive(wait); | |
784 | poll_wait(filp, &stream->read_wait, wait); | |
785 | ||
786 | finalized = stream->finalized; | |
787 | ||
788 | /* | |
789 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
790 | * ordering finalized load before offsets loads. | |
791 | */ | |
792 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
793 | ||
794 | if (finalized) | |
795 | mask |= POLLHUP; | |
796 | ||
92d9f5e6 | 797 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 798 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 799 | stream->metadata_out) |
d83004aa | 800 | mask |= POLLIN; |
92d9f5e6 | 801 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
802 | } |
803 | ||
804 | return mask; | |
805 | } | |
806 | ||
f613e3e6 MD |
807 | static |
808 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
809 | unsigned int cmd, unsigned long arg) | |
810 | { | |
811 | struct lttng_metadata_stream *stream = filp->private_data; | |
812 | ||
813 | stream->metadata_out = stream->metadata_in; | |
814 | } | |
815 | ||
d1344afa JD |
816 | /* |
817 | * Reset the counter of how much metadata has been consumed to 0. That way, | |
818 | * the consumer receives the content of the metadata cache unchanged. This is | |
819 | * different from the metadata_regenerate where the offset from epoch is | |
820 | * resampled, here we want the exact same content as the last time the metadata | |
821 | * was generated. This command is only possible if all the metadata written | |
822 | * in the cache has been output to the metadata stream to avoid corrupting the | |
823 | * metadata file. | |
824 | * | |
825 | * Return 0 on success, a negative value on error. | |
826 | */ | |
827 | static | |
828 | int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream) | |
829 | { | |
830 | int ret; | |
831 | struct lttng_metadata_cache *cache = stream->metadata_cache; | |
832 | ||
833 | mutex_lock(&cache->lock); | |
834 | if (stream->metadata_out != cache->metadata_written) { | |
835 | ret = -EBUSY; | |
836 | goto end; | |
837 | } | |
838 | stream->metadata_out = 0; | |
839 | stream->metadata_in = 0; | |
840 | wake_up_interruptible(&stream->read_wait); | |
841 | ret = 0; | |
842 | ||
843 | end: | |
844 | mutex_unlock(&cache->lock); | |
845 | return ret; | |
846 | } | |
847 | ||
d83004aa JD |
848 | static |
849 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
850 | unsigned int cmd, unsigned long arg) | |
851 | { | |
852 | int ret; | |
853 | struct lttng_metadata_stream *stream = filp->private_data; | |
854 | struct lib_ring_buffer *buf = stream->priv; | |
122c63cb MD |
855 | unsigned int rb_cmd; |
856 | bool coherent; | |
857 | ||
858 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
859 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
860 | else | |
861 | rb_cmd = cmd; | |
d83004aa JD |
862 | |
863 | switch (cmd) { | |
d83004aa JD |
864 | case RING_BUFFER_GET_NEXT_SUBBUF: |
865 | { | |
35097f36 JD |
866 | struct lttng_metadata_stream *stream = filp->private_data; |
867 | struct lib_ring_buffer *buf = stream->priv; | |
868 | struct channel *chan = buf->backend.chan; | |
869 | ||
122c63cb | 870 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
871 | if (ret > 0) { |
872 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
873 | ret = 0; | |
874 | } else if (ret < 0) | |
d83004aa JD |
875 | goto err; |
876 | break; | |
877 | } | |
f613e3e6 MD |
878 | case RING_BUFFER_GET_SUBBUF: |
879 | { | |
880 | /* | |
881 | * Random access is not allowed for metadata channel. | |
882 | */ | |
883 | return -ENOSYS; | |
884 | } | |
1d00109f MJ |
885 | case RING_BUFFER_FLUSH_EMPTY: |
886 | lttng_fallthrough; | |
35097f36 JD |
887 | case RING_BUFFER_FLUSH: |
888 | { | |
889 | struct lttng_metadata_stream *stream = filp->private_data; | |
890 | struct lib_ring_buffer *buf = stream->priv; | |
891 | struct channel *chan = buf->backend.chan; | |
892 | ||
893 | /* | |
894 | * Before doing the actual ring buffer flush, write up to one | |
895 | * packet of metadata in the ring buffer. | |
896 | */ | |
122c63cb | 897 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
898 | if (ret < 0) |
899 | goto err; | |
900 | break; | |
901 | } | |
9616f0bf JD |
902 | case RING_BUFFER_GET_METADATA_VERSION: |
903 | { | |
904 | struct lttng_metadata_stream *stream = filp->private_data; | |
905 | ||
906 | return put_u64(stream->version, arg); | |
907 | } | |
d1344afa JD |
908 | case RING_BUFFER_METADATA_CACHE_DUMP: |
909 | { | |
910 | struct lttng_metadata_stream *stream = filp->private_data; | |
911 | ||
912 | return lttng_metadata_cache_dump(stream); | |
913 | } | |
122c63cb MD |
914 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
915 | { | |
916 | struct lttng_metadata_stream *stream = filp->private_data; | |
917 | struct lib_ring_buffer *buf = stream->priv; | |
918 | struct channel *chan = buf->backend.chan; | |
919 | ||
920 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
921 | if (ret > 0) { | |
922 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
923 | ret = 0; | |
924 | } else if (ret < 0) { | |
925 | goto err; | |
926 | } | |
927 | break; | |
928 | } | |
d83004aa JD |
929 | default: |
930 | break; | |
931 | } | |
f613e3e6 MD |
932 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
933 | ||
d83004aa | 934 | /* Performing lib ring buffer ioctl after our own. */ |
122c63cb | 935 | ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
936 | if (ret < 0) |
937 | goto err; | |
d83004aa | 938 | |
f613e3e6 MD |
939 | switch (cmd) { |
940 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
941 | { | |
942 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
943 | cmd, arg); | |
944 | break; | |
945 | } | |
122c63cb MD |
946 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
947 | { | |
948 | return put_u32(coherent, arg); | |
949 | } | |
f613e3e6 MD |
950 | default: |
951 | break; | |
952 | } | |
d83004aa JD |
953 | err: |
954 | return ret; | |
955 | } | |
956 | ||
aeb9064d | 957 | #ifdef CONFIG_COMPAT |
d83004aa JD |
958 | static |
959 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
960 | unsigned int cmd, unsigned long arg) | |
961 | { | |
962 | int ret; | |
963 | struct lttng_metadata_stream *stream = filp->private_data; | |
964 | struct lib_ring_buffer *buf = stream->priv; | |
122c63cb MD |
965 | unsigned int rb_cmd; |
966 | bool coherent; | |
967 | ||
968 | if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK) | |
969 | rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF; | |
970 | else | |
971 | rb_cmd = cmd; | |
d83004aa JD |
972 | |
973 | switch (cmd) { | |
d83004aa JD |
974 | case RING_BUFFER_GET_NEXT_SUBBUF: |
975 | { | |
35097f36 JD |
976 | struct lttng_metadata_stream *stream = filp->private_data; |
977 | struct lib_ring_buffer *buf = stream->priv; | |
978 | struct channel *chan = buf->backend.chan; | |
979 | ||
122c63cb | 980 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
35097f36 JD |
981 | if (ret > 0) { |
982 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
983 | ret = 0; | |
984 | } else if (ret < 0) | |
d83004aa JD |
985 | goto err; |
986 | break; | |
987 | } | |
f613e3e6 MD |
988 | case RING_BUFFER_GET_SUBBUF: |
989 | { | |
990 | /* | |
991 | * Random access is not allowed for metadata channel. | |
992 | */ | |
993 | return -ENOSYS; | |
994 | } | |
1d00109f MJ |
995 | case RING_BUFFER_FLUSH_EMPTY: |
996 | lttng_fallthrough; | |
96c55c2f MD |
997 | case RING_BUFFER_FLUSH: |
998 | { | |
999 | struct lttng_metadata_stream *stream = filp->private_data; | |
1000 | struct lib_ring_buffer *buf = stream->priv; | |
1001 | struct channel *chan = buf->backend.chan; | |
1002 | ||
1003 | /* | |
1004 | * Before doing the actual ring buffer flush, write up to one | |
1005 | * packet of metadata in the ring buffer. | |
1006 | */ | |
122c63cb | 1007 | ret = lttng_metadata_output_channel(stream, chan, NULL); |
96c55c2f MD |
1008 | if (ret < 0) |
1009 | goto err; | |
1010 | break; | |
1011 | } | |
1012 | case RING_BUFFER_GET_METADATA_VERSION: | |
1013 | { | |
1014 | struct lttng_metadata_stream *stream = filp->private_data; | |
1015 | ||
1016 | return put_u64(stream->version, arg); | |
1017 | } | |
d1344afa JD |
1018 | case RING_BUFFER_METADATA_CACHE_DUMP: |
1019 | { | |
1020 | struct lttng_metadata_stream *stream = filp->private_data; | |
1021 | ||
1022 | return lttng_metadata_cache_dump(stream); | |
1023 | } | |
122c63cb MD |
1024 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1025 | { | |
1026 | struct lttng_metadata_stream *stream = filp->private_data; | |
1027 | struct lib_ring_buffer *buf = stream->priv; | |
1028 | struct channel *chan = buf->backend.chan; | |
1029 | ||
1030 | ret = lttng_metadata_output_channel(stream, chan, &coherent); | |
1031 | if (ret > 0) { | |
1032 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
1033 | ret = 0; | |
1034 | } else if (ret < 0) { | |
1035 | goto err; | |
1036 | } | |
1037 | break; | |
1038 | } | |
d83004aa JD |
1039 | default: |
1040 | break; | |
1041 | } | |
f613e3e6 MD |
1042 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
1043 | ||
d83004aa | 1044 | /* Performing lib ring buffer ioctl after our own. */ |
122c63cb | 1045 | ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf); |
f613e3e6 MD |
1046 | if (ret < 0) |
1047 | goto err; | |
d83004aa | 1048 | |
f613e3e6 MD |
1049 | switch (cmd) { |
1050 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
1051 | { | |
1052 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
1053 | cmd, arg); | |
1054 | break; | |
1055 | } | |
122c63cb MD |
1056 | case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK: |
1057 | { | |
1058 | return put_u32(coherent, arg); | |
1059 | } | |
f613e3e6 MD |
1060 | default: |
1061 | break; | |
1062 | } | |
d83004aa JD |
1063 | err: |
1064 | return ret; | |
1065 | } | |
aeb9064d | 1066 | #endif |
d83004aa | 1067 | |
b3b8072b MD |
1068 | /* |
1069 | * This is not used by anonymous file descriptors. This code is left | |
1070 | * there if we ever want to implement an inode with open() operation. | |
1071 | */ | |
d83004aa JD |
1072 | static |
1073 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
1074 | { | |
1075 | struct lttng_metadata_stream *stream = inode->i_private; | |
1076 | struct lib_ring_buffer *buf = stream->priv; | |
1077 | ||
1078 | file->private_data = buf; | |
b3b8072b MD |
1079 | /* |
1080 | * Since life-time of metadata cache differs from that of | |
1081 | * session, we need to keep our own reference on the transport. | |
1082 | */ | |
1083 | if (!try_module_get(stream->transport->owner)) { | |
1084 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1085 | return -EBUSY; | |
1086 | } | |
d83004aa JD |
1087 | return lib_ring_buffer_open(inode, file, buf); |
1088 | } | |
1089 | ||
1090 | static | |
1091 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
1092 | { | |
1093 | struct lttng_metadata_stream *stream = file->private_data; | |
1094 | struct lib_ring_buffer *buf = stream->priv; | |
1095 | ||
e0d82ce5 MD |
1096 | mutex_lock(&stream->metadata_cache->lock); |
1097 | list_del(&stream->list); | |
1098 | mutex_unlock(&stream->metadata_cache->lock); | |
d83004aa | 1099 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); |
b3b8072b | 1100 | module_put(stream->transport->owner); |
e0d82ce5 | 1101 | kfree(stream); |
d83004aa JD |
1102 | return lib_ring_buffer_release(inode, file, buf); |
1103 | } | |
1104 | ||
1105 | static | |
1106 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
1107 | struct pipe_inode_info *pipe, size_t len, | |
1108 | unsigned int flags) | |
1109 | { | |
1110 | struct lttng_metadata_stream *stream = in->private_data; | |
1111 | struct lib_ring_buffer *buf = stream->priv; | |
1112 | ||
1113 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
1114 | flags, buf); | |
1115 | } | |
1116 | ||
1117 | static | |
1118 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
1119 | struct vm_area_struct *vma) | |
1120 | { | |
1121 | struct lttng_metadata_stream *stream = filp->private_data; | |
1122 | struct lib_ring_buffer *buf = stream->priv; | |
1123 | ||
1124 | return lib_ring_buffer_mmap(filp, vma, buf); | |
1125 | } | |
1126 | ||
1127 | static | |
1128 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
1129 | .owner = THIS_MODULE, | |
1130 | .open = lttng_metadata_ring_buffer_open, | |
1131 | .release = lttng_metadata_ring_buffer_release, | |
1132 | .poll = lttng_metadata_ring_buffer_poll, | |
1133 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
1134 | .mmap = lttng_metadata_ring_buffer_mmap, | |
1135 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
1136 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
1137 | #ifdef CONFIG_COMPAT | |
1138 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
1139 | #endif | |
1140 | }; | |
1141 | ||
1142 | static | |
1143 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
1144 | const struct file_operations *fops) | |
ad1c05e1 | 1145 | { |
ad1c05e1 | 1146 | int stream_fd, ret; |
11b5a3c2 | 1147 | struct file *stream_file; |
ad1c05e1 | 1148 | |
4ac10b76 | 1149 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
1150 | if (stream_fd < 0) { |
1151 | ret = stream_fd; | |
1152 | goto fd_error; | |
1153 | } | |
d83004aa JD |
1154 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
1155 | stream_priv, O_RDWR); | |
c0e31d2e MD |
1156 | if (IS_ERR(stream_file)) { |
1157 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
1158 | goto file_error; |
1159 | } | |
409453cb MD |
1160 | /* |
1161 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
1162 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
1163 | * file descriptor, so we set FMODE_PREAD here. | |
1164 | */ | |
d7b6f197 | 1165 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 1166 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
1167 | /* |
1168 | * The stream holds a reference to the channel within the generic ring | |
1169 | * buffer library, so no need to hold a refcount on the channel and | |
1170 | * session files here. | |
1171 | */ | |
ad1c05e1 MD |
1172 | return stream_fd; |
1173 | ||
1174 | file_error: | |
1175 | put_unused_fd(stream_fd); | |
d83004aa JD |
1176 | fd_error: |
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | static | |
1181 | int lttng_abi_open_stream(struct file *channel_file) | |
1182 | { | |
1183 | struct lttng_channel *channel = channel_file->private_data; | |
1184 | struct lib_ring_buffer *buf; | |
1185 | int ret; | |
1186 | void *stream_priv; | |
1187 | ||
1188 | buf = channel->ops->buffer_read_open(channel->chan); | |
1189 | if (!buf) | |
1190 | return -ENOENT; | |
1191 | ||
1192 | stream_priv = buf; | |
1193 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 1194 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
1195 | if (ret < 0) |
1196 | goto fd_error; | |
1197 | ||
1198 | return ret; | |
1199 | ||
1200 | fd_error: | |
1201 | channel->ops->buffer_read_close(buf); | |
1202 | return ret; | |
1203 | } | |
1204 | ||
1205 | static | |
1206 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
1207 | { | |
1208 | struct lttng_channel *channel = channel_file->private_data; | |
1209 | struct lttng_session *session = channel->session; | |
1210 | struct lib_ring_buffer *buf; | |
1211 | int ret; | |
1212 | struct lttng_metadata_stream *metadata_stream; | |
1213 | void *stream_priv; | |
1214 | ||
1215 | buf = channel->ops->buffer_read_open(channel->chan); | |
1216 | if (!buf) | |
1217 | return -ENOENT; | |
1218 | ||
1219 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
1220 | GFP_KERNEL); | |
b3b8072b MD |
1221 | if (!metadata_stream) { |
1222 | ret = -ENOMEM; | |
1223 | goto nomem; | |
1224 | } | |
d83004aa JD |
1225 | metadata_stream->metadata_cache = session->metadata_cache; |
1226 | init_waitqueue_head(&metadata_stream->read_wait); | |
1227 | metadata_stream->priv = buf; | |
1228 | stream_priv = metadata_stream; | |
b3b8072b | 1229 | metadata_stream->transport = channel->transport; |
122c63cb MD |
1230 | /* Initial state is an empty metadata, considered as incoherent. */ |
1231 | metadata_stream->coherent = false; | |
b3b8072b MD |
1232 | |
1233 | /* | |
1234 | * Since life-time of metadata cache differs from that of | |
1235 | * session, we need to keep our own reference on the transport. | |
1236 | */ | |
1237 | if (!try_module_get(metadata_stream->transport->owner)) { | |
1238 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
1239 | ret = -EINVAL; | |
1240 | goto notransport; | |
1241 | } | |
1242 | ||
901aaa5f FD |
1243 | if (!lttng_kref_get(&session->metadata_cache->refcount)) { |
1244 | ret = -EOVERFLOW; | |
9c1f4643 | 1245 | goto kref_error; |
901aaa5f FD |
1246 | } |
1247 | ||
d83004aa JD |
1248 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
1249 | <tng_metadata_ring_buffer_file_operations); | |
1250 | if (ret < 0) | |
1251 | goto fd_error; | |
1252 | ||
e0d82ce5 | 1253 | mutex_lock(&session->metadata_cache->lock); |
d83004aa JD |
1254 | list_add(&metadata_stream->list, |
1255 | &session->metadata_cache->metadata_stream); | |
e0d82ce5 | 1256 | mutex_unlock(&session->metadata_cache->lock); |
d83004aa JD |
1257 | return ret; |
1258 | ||
ad1c05e1 | 1259 | fd_error: |
9c1f4643 MD |
1260 | kref_put(&session->metadata_cache->refcount, metadata_cache_destroy); |
1261 | kref_error: | |
b3b8072b MD |
1262 | module_put(metadata_stream->transport->owner); |
1263 | notransport: | |
1264 | kfree(metadata_stream); | |
1265 | nomem: | |
11b5a3c2 | 1266 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
1267 | return ret; |
1268 | } | |
1269 | ||
ad594e3a MD |
1270 | static |
1271 | int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param) | |
1272 | { | |
1273 | /* Limit ABI to implemented features. */ | |
1274 | switch (event_param->instrumentation) { | |
1275 | case LTTNG_KERNEL_SYSCALL: | |
1276 | switch (event_param->u.syscall.entryexit) { | |
1277 | case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: | |
1278 | break; | |
1279 | default: | |
1280 | return -EINVAL; | |
1281 | } | |
1282 | switch (event_param->u.syscall.abi) { | |
1283 | case LTTNG_KERNEL_SYSCALL_ABI_ALL: | |
1284 | break; | |
1285 | default: | |
1286 | return -EINVAL; | |
1287 | } | |
1288 | switch (event_param->u.syscall.match) { | |
1289 | case LTTNG_SYSCALL_MATCH_NAME: | |
1290 | break; | |
1291 | default: | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | break; | |
1295 | ||
1d00109f MJ |
1296 | case LTTNG_KERNEL_TRACEPOINT: |
1297 | lttng_fallthrough; | |
1298 | case LTTNG_KERNEL_KPROBE: | |
1299 | lttng_fallthrough; | |
1300 | case LTTNG_KERNEL_KRETPROBE: | |
1301 | lttng_fallthrough; | |
1302 | case LTTNG_KERNEL_NOOP: | |
1303 | lttng_fallthrough; | |
ad594e3a MD |
1304 | case LTTNG_KERNEL_UPROBE: |
1305 | break; | |
1306 | ||
1d00109f MJ |
1307 | case LTTNG_KERNEL_FUNCTION: |
1308 | lttng_fallthrough; | |
ad594e3a MD |
1309 | default: |
1310 | return -EINVAL; | |
1311 | } | |
1312 | return 0; | |
1313 | } | |
1314 | ||
653fe716 | 1315 | static |
c0e31d2e | 1316 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 1317 | struct lttng_kernel_event *event_param) |
653fe716 | 1318 | { |
a90917c3 | 1319 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 1320 | int event_fd, ret; |
11b5a3c2 | 1321 | struct file *event_file; |
3c997079 | 1322 | void *priv; |
653fe716 | 1323 | |
6dccd6c1 JD |
1324 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
1325 | switch (event_param->instrumentation) { | |
7371f44c | 1326 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 1327 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 1328 | break; |
ab2277d6 | 1329 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 1330 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 1331 | break; |
ab2277d6 | 1332 | case LTTNG_KERNEL_FUNCTION: |
2bf9218e MD |
1333 | WARN_ON_ONCE(1); |
1334 | /* Not implemented. */ | |
e0a7a7c4 MD |
1335 | break; |
1336 | default: | |
1337 | break; | |
1338 | } | |
33a39a3c MD |
1339 | event_fd = lttng_get_unused_fd(); |
1340 | if (event_fd < 0) { | |
1341 | ret = event_fd; | |
1342 | goto fd_error; | |
1343 | } | |
1344 | event_file = anon_inode_getfile("[lttng_event]", | |
1345 | <tng_event_fops, | |
1346 | NULL, O_RDWR); | |
1347 | if (IS_ERR(event_file)) { | |
1348 | ret = PTR_ERR(event_file); | |
1349 | goto file_error; | |
1350 | } | |
9c1f4643 | 1351 | /* The event holds a reference on the channel */ |
98d7281c | 1352 | if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) { |
0d2c717f | 1353 | ret = -EOVERFLOW; |
9c1f4643 MD |
1354 | goto refcount_error; |
1355 | } | |
ad594e3a MD |
1356 | ret = lttng_abi_validate_event_param(event_param); |
1357 | if (ret) | |
1358 | goto event_error; | |
33a39a3c MD |
1359 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT |
1360 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1361 | struct lttng_enabler *enabler; | |
1362 | ||
4993071a PP |
1363 | if (strutils_is_star_glob_pattern(event_param->name)) { |
1364 | /* | |
1365 | * If the event name is a star globbing pattern, | |
1366 | * we create the special star globbing enabler. | |
1367 | */ | |
1368 | enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB, | |
33a39a3c | 1369 | event_param, channel); |
3c997079 | 1370 | } else { |
33a39a3c MD |
1371 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1372 | event_param, channel); | |
1ec65de1 | 1373 | } |
33a39a3c MD |
1374 | priv = enabler; |
1375 | } else { | |
1376 | struct lttng_event *event; | |
4ee2453d | 1377 | |
33a39a3c MD |
1378 | /* |
1379 | * We tolerate no failure path after event creation. It | |
1380 | * will stay invariant for the rest of the session. | |
1381 | */ | |
1382 | event = lttng_event_create(channel, event_param, | |
1383 | NULL, NULL, | |
1384 | event_param->instrumentation); | |
1385 | WARN_ON_ONCE(!event); | |
1386 | if (IS_ERR(event)) { | |
1387 | ret = PTR_ERR(event); | |
1388 | goto event_error; | |
80f87dd2 | 1389 | } |
33a39a3c | 1390 | priv = event; |
03037b98 | 1391 | } |
33a39a3c MD |
1392 | event_file->private_data = priv; |
1393 | fd_install(event_fd, event_file); | |
653fe716 MD |
1394 | return event_fd; |
1395 | ||
03037b98 | 1396 | event_error: |
9c1f4643 MD |
1397 | atomic_long_dec(&channel_file->f_count); |
1398 | refcount_error: | |
c0e31d2e | 1399 | fput(event_file); |
653fe716 MD |
1400 | file_error: |
1401 | put_unused_fd(event_fd); | |
1402 | fd_error: | |
653fe716 MD |
1403 | return ret; |
1404 | } | |
ad1c05e1 MD |
1405 | |
1406 | /** | |
1407 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1408 | * | |
c0e31d2e | 1409 | * @file: the file |
ad1c05e1 MD |
1410 | * @cmd: the command |
1411 | * @arg: command arg | |
1412 | * | |
1413 | * This ioctl implements lttng commands: | |
38d024ae | 1414 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1415 | * Returns an event stream file descriptor or failure. |
1416 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1417 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1418 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1419 | * LTTNG_KERNEL_CONTEXT |
1420 | * Prepend a context field to each event in the channel | |
e64957da MD |
1421 | * LTTNG_KERNEL_ENABLE |
1422 | * Enable recording for events in this channel (weak enable) | |
1423 | * LTTNG_KERNEL_DISABLE | |
1424 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1425 | * |
baf20995 MD |
1426 | * Channel and event file descriptors also hold a reference on the session. |
1427 | */ | |
ad1c05e1 | 1428 | static |
c0e31d2e | 1429 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1430 | { |
a90917c3 | 1431 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1432 | |
baf20995 | 1433 | switch (cmd) { |
6dccd6c1 | 1434 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1435 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1436 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1437 | case LTTNG_KERNEL_OLD_EVENT: |
1438 | { | |
1439 | struct lttng_kernel_event *uevent_param; | |
1440 | struct lttng_kernel_old_event *old_uevent_param; | |
1441 | int ret; | |
1442 | ||
1443 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1444 | GFP_KERNEL); | |
1445 | if (!uevent_param) { | |
1446 | ret = -ENOMEM; | |
1447 | goto old_event_end; | |
1448 | } | |
1449 | old_uevent_param = kmalloc( | |
1450 | sizeof(struct lttng_kernel_old_event), | |
1451 | GFP_KERNEL); | |
1452 | if (!old_uevent_param) { | |
1453 | ret = -ENOMEM; | |
1454 | goto old_event_error_free_param; | |
1455 | } | |
1456 | if (copy_from_user(old_uevent_param, | |
1457 | (struct lttng_kernel_old_event __user *) arg, | |
1458 | sizeof(struct lttng_kernel_old_event))) { | |
1459 | ret = -EFAULT; | |
1460 | goto old_event_error_free_old_param; | |
1461 | } | |
1462 | ||
1463 | memcpy(uevent_param->name, old_uevent_param->name, | |
1464 | sizeof(uevent_param->name)); | |
1465 | uevent_param->instrumentation = | |
1466 | old_uevent_param->instrumentation; | |
1467 | ||
1468 | switch (old_uevent_param->instrumentation) { | |
1469 | case LTTNG_KERNEL_KPROBE: | |
1470 | uevent_param->u.kprobe.addr = | |
1471 | old_uevent_param->u.kprobe.addr; | |
1472 | uevent_param->u.kprobe.offset = | |
1473 | old_uevent_param->u.kprobe.offset; | |
1474 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1475 | old_uevent_param->u.kprobe.symbol_name, | |
1476 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1477 | break; | |
1478 | case LTTNG_KERNEL_KRETPROBE: | |
1479 | uevent_param->u.kretprobe.addr = | |
1480 | old_uevent_param->u.kretprobe.addr; | |
1481 | uevent_param->u.kretprobe.offset = | |
1482 | old_uevent_param->u.kretprobe.offset; | |
1483 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1484 | old_uevent_param->u.kretprobe.symbol_name, | |
1485 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1486 | break; | |
1487 | case LTTNG_KERNEL_FUNCTION: | |
2bf9218e MD |
1488 | WARN_ON_ONCE(1); |
1489 | /* Not implemented. */ | |
6dccd6c1 JD |
1490 | break; |
1491 | default: | |
1492 | break; | |
1493 | } | |
1494 | ret = lttng_abi_create_event(file, uevent_param); | |
1495 | ||
1496 | old_event_error_free_old_param: | |
1497 | kfree(old_uevent_param); | |
1498 | old_event_error_free_param: | |
1499 | kfree(uevent_param); | |
1500 | old_event_end: | |
1501 | return ret; | |
1502 | } | |
38d024ae | 1503 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1504 | { |
1505 | struct lttng_kernel_event uevent_param; | |
1506 | ||
1507 | if (copy_from_user(&uevent_param, | |
1508 | (struct lttng_kernel_event __user *) arg, | |
1509 | sizeof(uevent_param))) | |
1510 | return -EFAULT; | |
1511 | return lttng_abi_create_event(file, &uevent_param); | |
1512 | } | |
1513 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1514 | { | |
1515 | struct lttng_kernel_context *ucontext_param; | |
1516 | struct lttng_kernel_old_context *old_ucontext_param; | |
1517 | int ret; | |
1518 | ||
1519 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1520 | GFP_KERNEL); | |
1521 | if (!ucontext_param) { | |
1522 | ret = -ENOMEM; | |
1523 | goto old_ctx_end; | |
1524 | } | |
1525 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1526 | GFP_KERNEL); | |
1527 | if (!old_ucontext_param) { | |
1528 | ret = -ENOMEM; | |
1529 | goto old_ctx_error_free_param; | |
1530 | } | |
1531 | ||
1532 | if (copy_from_user(old_ucontext_param, | |
1533 | (struct lttng_kernel_old_context __user *) arg, | |
1534 | sizeof(struct lttng_kernel_old_context))) { | |
1535 | ret = -EFAULT; | |
1536 | goto old_ctx_error_free_old_param; | |
1537 | } | |
1538 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1539 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1540 | sizeof(ucontext_param->padding)); | |
1541 | /* only type that uses the union */ | |
1542 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1543 | ucontext_param->u.perf_counter.type = | |
1544 | old_ucontext_param->u.perf_counter.type; | |
1545 | ucontext_param->u.perf_counter.config = | |
1546 | old_ucontext_param->u.perf_counter.config; | |
1547 | memcpy(ucontext_param->u.perf_counter.name, | |
1548 | old_ucontext_param->u.perf_counter.name, | |
1549 | sizeof(ucontext_param->u.perf_counter.name)); | |
1550 | } | |
1551 | ||
1552 | ret = lttng_abi_add_context(file, | |
1553 | ucontext_param, | |
1554 | &channel->ctx, channel->session); | |
1555 | ||
1556 | old_ctx_error_free_old_param: | |
1557 | kfree(old_ucontext_param); | |
1558 | old_ctx_error_free_param: | |
1559 | kfree(ucontext_param); | |
1560 | old_ctx_end: | |
1561 | return ret; | |
1562 | } | |
8070f5c0 | 1563 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1564 | { |
1565 | struct lttng_kernel_context ucontext_param; | |
1566 | ||
1567 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1568 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1569 | sizeof(ucontext_param))) |
1570 | return -EFAULT; | |
1571 | return lttng_abi_add_context(file, | |
1572 | &ucontext_param, | |
8070f5c0 | 1573 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1574 | } |
1575 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1576 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1577 | return lttng_channel_enable(channel); |
6dccd6c1 | 1578 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1579 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1580 | return lttng_channel_disable(channel); |
12e579db MD |
1581 | case LTTNG_KERNEL_SYSCALL_MASK: |
1582 | return lttng_channel_syscall_mask(channel, | |
1583 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1584 | default: |
1585 | return -ENOIOCTLCMD; | |
1586 | } | |
1587 | } | |
1588 | ||
5dbbdb43 MD |
1589 | /** |
1590 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1591 | * | |
1592 | * @file: the file | |
1593 | * @cmd: the command | |
1594 | * @arg: command arg | |
1595 | * | |
1596 | * This ioctl implements lttng commands: | |
38d024ae | 1597 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1598 | * Returns an event stream file descriptor or failure. |
1599 | * | |
1600 | * Channel and event file descriptors also hold a reference on the session. | |
1601 | */ | |
1602 | static | |
1603 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1604 | { | |
1605 | switch (cmd) { | |
6dccd6c1 | 1606 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1607 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1608 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1609 | default: |
1610 | return -ENOIOCTLCMD; | |
1611 | } | |
1612 | } | |
1613 | ||
653fe716 MD |
1614 | /** |
1615 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1616 | * | |
c0e31d2e | 1617 | * @file: the file |
653fe716 MD |
1618 | * @wait: poll table |
1619 | */ | |
c0e31d2e | 1620 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1621 | { |
a90917c3 | 1622 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1623 | unsigned int mask = 0; |
1624 | ||
c0e31d2e | 1625 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1626 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1627 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1628 | wait); | |
653fe716 | 1629 | |
254ec7bc MD |
1630 | if (channel->ops->is_disabled(channel->chan)) |
1631 | return POLLERR; | |
24cedcfe | 1632 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1633 | return POLLHUP; |
f71ecafa | 1634 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1635 | return POLLIN | POLLRDNORM; |
f71ecafa | 1636 | return 0; |
653fe716 MD |
1637 | } |
1638 | return mask; | |
1639 | ||
1640 | } | |
1641 | ||
0a84a57f MD |
1642 | static |
1643 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1644 | { | |
a90917c3 | 1645 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1646 | |
1647 | if (channel) | |
1648 | fput(channel->session->file); | |
0a84a57f MD |
1649 | return 0; |
1650 | } | |
1651 | ||
d83004aa JD |
1652 | static |
1653 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1654 | { | |
1655 | struct lttng_channel *channel = file->private_data; | |
1656 | ||
1657 | if (channel) { | |
d83004aa | 1658 | fput(channel->session->file); |
a3381417 | 1659 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1660 | } |
1661 | ||
1662 | return 0; | |
1663 | } | |
1664 | ||
ad1c05e1 | 1665 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1666 | .owner = THIS_MODULE, |
03037b98 | 1667 | .release = lttng_channel_release, |
653fe716 | 1668 | .poll = lttng_channel_poll, |
ad1c05e1 | 1669 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1670 | #ifdef CONFIG_COMPAT |
03037b98 | 1671 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1672 | #endif |
11b5a3c2 | 1673 | }; |
baf20995 | 1674 | |
5dbbdb43 | 1675 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1676 | .owner = THIS_MODULE, |
d83004aa | 1677 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1678 | .unlocked_ioctl = lttng_metadata_ioctl, |
1679 | #ifdef CONFIG_COMPAT | |
1680 | .compat_ioctl = lttng_metadata_ioctl, | |
1681 | #endif | |
1682 | }; | |
1683 | ||
8070f5c0 MD |
1684 | /** |
1685 | * lttng_event_ioctl - lttng syscall through ioctl | |
1686 | * | |
1687 | * @file: the file | |
1688 | * @cmd: the command | |
1689 | * @arg: command arg | |
1690 | * | |
1691 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1692 | * LTTNG_KERNEL_CONTEXT |
1693 | * Prepend a context field to each record of this event | |
e64957da MD |
1694 | * LTTNG_KERNEL_ENABLE |
1695 | * Enable recording for this event (weak enable) | |
1696 | * LTTNG_KERNEL_DISABLE | |
1697 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1698 | */ |
1699 | static | |
1700 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1701 | { | |
3c997079 MD |
1702 | struct lttng_event *event; |
1703 | struct lttng_enabler *enabler; | |
1704 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1705 | |
1706 | switch (cmd) { | |
6dccd6c1 JD |
1707 | case LTTNG_KERNEL_OLD_CONTEXT: |
1708 | { | |
3c997079 MD |
1709 | /* Not implemented */ |
1710 | return -ENOSYS; | |
6dccd6c1 | 1711 | } |
8070f5c0 | 1712 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1713 | { |
3c997079 MD |
1714 | /* Not implemented */ |
1715 | return -ENOSYS; | |
6dccd6c1 JD |
1716 | } |
1717 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1718 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1719 | switch (*evtype) { |
1720 | case LTTNG_TYPE_EVENT: | |
1721 | event = file->private_data; | |
1722 | return lttng_event_enable(event); | |
1723 | case LTTNG_TYPE_ENABLER: | |
1724 | enabler = file->private_data; | |
1725 | return lttng_enabler_enable(enabler); | |
1726 | default: | |
1727 | WARN_ON_ONCE(1); | |
1728 | return -ENOSYS; | |
1729 | } | |
6dccd6c1 | 1730 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1731 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1732 | switch (*evtype) { |
1733 | case LTTNG_TYPE_EVENT: | |
1734 | event = file->private_data; | |
1735 | return lttng_event_disable(event); | |
1736 | case LTTNG_TYPE_ENABLER: | |
1737 | enabler = file->private_data; | |
1738 | return lttng_enabler_disable(enabler); | |
1739 | default: | |
1740 | WARN_ON_ONCE(1); | |
1741 | return -ENOSYS; | |
1742 | } | |
07dfc1d0 MD |
1743 | case LTTNG_KERNEL_FILTER: |
1744 | switch (*evtype) { | |
1745 | case LTTNG_TYPE_EVENT: | |
1746 | return -EINVAL; | |
1747 | case LTTNG_TYPE_ENABLER: | |
1748 | { | |
1749 | enabler = file->private_data; | |
1750 | return lttng_enabler_attach_bytecode(enabler, | |
1751 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1752 | } | |
0586316f MD |
1753 | default: |
1754 | WARN_ON_ONCE(1); | |
1755 | return -ENOSYS; | |
07dfc1d0 | 1756 | } |
3aed4dca FD |
1757 | case LTTNG_KERNEL_ADD_CALLSITE: |
1758 | switch (*evtype) { | |
1759 | case LTTNG_TYPE_EVENT: | |
1760 | event = file->private_data; | |
1761 | return lttng_event_add_callsite(event, | |
1762 | (struct lttng_kernel_event_callsite __user *) arg); | |
1763 | case LTTNG_TYPE_ENABLER: | |
1764 | return -EINVAL; | |
64c147c0 MD |
1765 | default: |
1766 | WARN_ON_ONCE(1); | |
1767 | return -ENOSYS; | |
3aed4dca | 1768 | } |
8070f5c0 MD |
1769 | default: |
1770 | return -ENOIOCTLCMD; | |
1771 | } | |
1772 | } | |
1773 | ||
0a84a57f MD |
1774 | static |
1775 | int lttng_event_release(struct inode *inode, struct file *file) | |
1776 | { | |
3c997079 MD |
1777 | struct lttng_event *event; |
1778 | struct lttng_enabler *enabler; | |
1779 | enum lttng_event_type *evtype = file->private_data; | |
1780 | ||
1781 | if (!evtype) | |
1782 | return 0; | |
1783 | ||
1784 | switch (*evtype) { | |
1785 | case LTTNG_TYPE_EVENT: | |
1786 | event = file->private_data; | |
1787 | if (event) | |
1788 | fput(event->chan->file); | |
1789 | break; | |
1790 | case LTTNG_TYPE_ENABLER: | |
1791 | enabler = file->private_data; | |
1792 | if (enabler) | |
1793 | fput(enabler->chan->file); | |
1794 | break; | |
1795 | default: | |
1796 | WARN_ON_ONCE(1); | |
1797 | break; | |
1798 | } | |
c269fff4 | 1799 | |
0a84a57f MD |
1800 | return 0; |
1801 | } | |
1802 | ||
3b923e5b | 1803 | /* TODO: filter control ioctl */ |
0a84a57f | 1804 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1805 | .owner = THIS_MODULE, |
0a84a57f | 1806 | .release = lttng_event_release, |
8070f5c0 MD |
1807 | .unlocked_ioctl = lttng_event_ioctl, |
1808 | #ifdef CONFIG_COMPAT | |
1809 | .compat_ioctl = lttng_event_ioctl, | |
1810 | #endif | |
11b5a3c2 | 1811 | }; |
0a84a57f | 1812 | |
3b731ab1 JD |
1813 | static int put_u64(uint64_t val, unsigned long arg) |
1814 | { | |
1815 | return put_user(val, (uint64_t __user *) arg); | |
1816 | } | |
1817 | ||
122c63cb MD |
1818 | static int put_u32(uint32_t val, unsigned long arg) |
1819 | { | |
1820 | return put_user(val, (uint32_t __user *) arg); | |
1821 | } | |
1822 | ||
ed8d02d6 JD |
1823 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1824 | unsigned int cmd, unsigned long arg) | |
1825 | { | |
3b731ab1 JD |
1826 | struct lib_ring_buffer *buf = filp->private_data; |
1827 | struct channel *chan = buf->backend.chan; | |
1828 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1829 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1830 | int ret; |
1831 | ||
1832 | if (atomic_read(&chan->record_disabled)) | |
1833 | return -EIO; | |
1834 | ||
ed8d02d6 | 1835 | switch (cmd) { |
3b731ab1 JD |
1836 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1837 | { | |
1838 | uint64_t ts; | |
1839 | ||
dd5a0db3 | 1840 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1841 | if (ret < 0) |
1842 | goto error; | |
1843 | return put_u64(ts, arg); | |
1844 | } | |
1845 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1846 | { | |
1847 | uint64_t ts; | |
1848 | ||
dd5a0db3 | 1849 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1850 | if (ret < 0) |
1851 | goto error; | |
1852 | return put_u64(ts, arg); | |
1853 | } | |
1854 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1855 | { | |
1856 | uint64_t ed; | |
1857 | ||
dd5a0db3 | 1858 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1859 | if (ret < 0) |
1860 | goto error; | |
1861 | return put_u64(ed, arg); | |
1862 | } | |
1863 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1864 | { | |
1865 | uint64_t cs; | |
1866 | ||
dd5a0db3 | 1867 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1868 | if (ret < 0) |
1869 | goto error; | |
1870 | return put_u64(cs, arg); | |
1871 | } | |
1872 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1873 | { | |
1874 | uint64_t ps; | |
1875 | ||
dd5a0db3 | 1876 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1877 | if (ret < 0) |
1878 | goto error; | |
1879 | return put_u64(ps, arg); | |
1880 | } | |
1881 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1882 | { | |
1883 | uint64_t si; | |
1884 | ||
dd5a0db3 | 1885 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1886 | if (ret < 0) |
1887 | goto error; | |
1888 | return put_u64(si, arg); | |
1889 | } | |
2348ca17 JD |
1890 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1891 | { | |
1892 | uint64_t ts; | |
1893 | ||
dd5a0db3 | 1894 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1895 | if (ret < 0) |
1896 | goto error; | |
1897 | return put_u64(ts, arg); | |
1898 | } | |
5b3cf4f9 JD |
1899 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1900 | { | |
1901 | uint64_t seq; | |
1902 | ||
1903 | ret = ops->sequence_number(config, buf, &seq); | |
1904 | if (ret < 0) | |
1905 | goto error; | |
1906 | return put_u64(seq, arg); | |
1907 | } | |
5594698f JD |
1908 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1909 | { | |
1910 | uint64_t id; | |
1911 | ||
1912 | ret = ops->instance_id(config, buf, &id); | |
1913 | if (ret < 0) | |
1914 | goto error; | |
1915 | return put_u64(id, arg); | |
1916 | } | |
3b731ab1 JD |
1917 | default: |
1918 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1919 | cmd, arg); | |
ed8d02d6 | 1920 | } |
3b731ab1 JD |
1921 | |
1922 | error: | |
1923 | return -ENOSYS; | |
ed8d02d6 JD |
1924 | } |
1925 | ||
1926 | #ifdef CONFIG_COMPAT | |
1927 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1928 | unsigned int cmd, unsigned long arg) | |
1929 | { | |
3b731ab1 JD |
1930 | struct lib_ring_buffer *buf = filp->private_data; |
1931 | struct channel *chan = buf->backend.chan; | |
1932 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1933 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1934 | int ret; |
1935 | ||
1936 | if (atomic_read(&chan->record_disabled)) | |
1937 | return -EIO; | |
1938 | ||
ed8d02d6 | 1939 | switch (cmd) { |
3b731ab1 JD |
1940 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1941 | { | |
1942 | uint64_t ts; | |
1943 | ||
dd5a0db3 | 1944 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1945 | if (ret < 0) |
1946 | goto error; | |
1947 | return put_u64(ts, arg); | |
1948 | } | |
1949 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1950 | { | |
1951 | uint64_t ts; | |
1952 | ||
dd5a0db3 | 1953 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1954 | if (ret < 0) |
1955 | goto error; | |
1956 | return put_u64(ts, arg); | |
1957 | } | |
1958 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1959 | { | |
1960 | uint64_t ed; | |
1961 | ||
dd5a0db3 | 1962 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1963 | if (ret < 0) |
1964 | goto error; | |
1965 | return put_u64(ed, arg); | |
ed8d02d6 | 1966 | } |
3b731ab1 JD |
1967 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1968 | { | |
1969 | uint64_t cs; | |
1970 | ||
dd5a0db3 | 1971 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1972 | if (ret < 0) |
1973 | goto error; | |
1974 | return put_u64(cs, arg); | |
1975 | } | |
1976 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1977 | { | |
1978 | uint64_t ps; | |
1979 | ||
dd5a0db3 | 1980 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1981 | if (ret < 0) |
1982 | goto error; | |
1983 | return put_u64(ps, arg); | |
1984 | } | |
1985 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1986 | { | |
1987 | uint64_t si; | |
1988 | ||
dd5a0db3 | 1989 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1990 | if (ret < 0) |
1991 | goto error; | |
1992 | return put_u64(si, arg); | |
1993 | } | |
2348ca17 JD |
1994 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1995 | { | |
1996 | uint64_t ts; | |
1997 | ||
dd5a0db3 | 1998 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1999 | if (ret < 0) |
2000 | goto error; | |
2001 | return put_u64(ts, arg); | |
2002 | } | |
5b3cf4f9 JD |
2003 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
2004 | { | |
2005 | uint64_t seq; | |
2006 | ||
2007 | ret = ops->sequence_number(config, buf, &seq); | |
2008 | if (ret < 0) | |
2009 | goto error; | |
2010 | return put_u64(seq, arg); | |
2011 | } | |
5594698f JD |
2012 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
2013 | { | |
2014 | uint64_t id; | |
2015 | ||
2016 | ret = ops->instance_id(config, buf, &id); | |
2017 | if (ret < 0) | |
2018 | goto error; | |
2019 | return put_u64(id, arg); | |
2020 | } | |
3b731ab1 JD |
2021 | default: |
2022 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
2023 | cmd, arg); | |
2024 | } | |
2025 | ||
2026 | error: | |
2027 | return -ENOSYS; | |
ed8d02d6 JD |
2028 | } |
2029 | #endif /* CONFIG_COMPAT */ | |
2030 | ||
2031 | static void lttng_stream_override_ring_buffer_fops(void) | |
2032 | { | |
2033 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
2034 | lttng_stream_ring_buffer_file_operations.open = | |
2035 | lib_ring_buffer_file_operations.open; | |
2036 | lttng_stream_ring_buffer_file_operations.release = | |
2037 | lib_ring_buffer_file_operations.release; | |
2038 | lttng_stream_ring_buffer_file_operations.poll = | |
2039 | lib_ring_buffer_file_operations.poll; | |
2040 | lttng_stream_ring_buffer_file_operations.splice_read = | |
2041 | lib_ring_buffer_file_operations.splice_read; | |
2042 | lttng_stream_ring_buffer_file_operations.mmap = | |
2043 | lib_ring_buffer_file_operations.mmap; | |
2044 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
2045 | lttng_stream_ring_buffer_ioctl; | |
2046 | lttng_stream_ring_buffer_file_operations.llseek = | |
2047 | lib_ring_buffer_file_operations.llseek; | |
2048 | #ifdef CONFIG_COMPAT | |
2049 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
2050 | lttng_stream_ring_buffer_compat_ioctl; | |
2051 | #endif | |
2052 | } | |
2053 | ||
80996790 | 2054 | int __init lttng_abi_init(void) |
baf20995 MD |
2055 | { |
2056 | int ret = 0; | |
2057 | ||
ea53823c | 2058 | wrapper_vmalloc_sync_mappings(); |
2754583e | 2059 | lttng_clock_ref(); |
f771eda6 JD |
2060 | |
2061 | ret = lttng_tp_mempool_init(); | |
2062 | if (ret) { | |
2063 | goto error; | |
2064 | } | |
2065 | ||
d29348f7 | 2066 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
122ba89c | 2067 | <tng_proc_ops, NULL); |
2470a237 | 2068 | |
255e52a4 | 2069 | if (!lttng_proc_dentry) { |
baf20995 MD |
2070 | printk(KERN_ERR "Error creating LTTng control file\n"); |
2071 | ret = -ENOMEM; | |
2072 | goto error; | |
2073 | } | |
ed8d02d6 | 2074 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 2075 | return 0; |
ed8d02d6 | 2076 | |
baf20995 | 2077 | error: |
f771eda6 | 2078 | lttng_tp_mempool_destroy(); |
2754583e | 2079 | lttng_clock_unref(); |
baf20995 MD |
2080 | return ret; |
2081 | } | |
2082 | ||
e6e65fcd MD |
2083 | /* No __exit annotation because used by init error path too. */ |
2084 | void lttng_abi_exit(void) | |
baf20995 | 2085 | { |
f771eda6 | 2086 | lttng_tp_mempool_destroy(); |
2754583e | 2087 | lttng_clock_unref(); |
e6a17f26 MD |
2088 | if (lttng_proc_dentry) |
2089 | remove_proc_entry("lttng", NULL); | |
baf20995 | 2090 | } |