Commit | Line | Data |
---|---|---|
baf20995 | 1 | /* |
e8951e63 | 2 | * lttng-abi.c |
baf20995 | 3 | * |
e8951e63 | 4 | * LTTng ABI |
baf20995 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | * | |
22 | * | |
baf20995 MD |
23 | * Mimic system calls for: |
24 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
25 | * - channel creation, returns a file descriptor or failure. |
26 | * - Operates on a session file descriptor | |
27 | * - Takes all channel options as parameters. | |
28 | * - stream get, returns a file descriptor or failure. | |
29 | * - Operates on a channel file descriptor. | |
30 | * - stream notifier get, returns a file descriptor or failure. | |
31 | * - Operates on a channel file descriptor. | |
32 | * - event creation, returns a file descriptor or failure. | |
33 | * - Operates on a channel file descriptor | |
34 | * - Takes an event name as parameter | |
35 | * - Takes an instrumentation source as parameter | |
36 | * - e.g. tracepoints, dynamic_probes... | |
37 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
38 | */ |
39 | ||
11b5a3c2 | 40 | #include <linux/module.h> |
e6a17f26 | 41 | #include <linux/proc_fs.h> |
11b5a3c2 MD |
42 | #include <linux/anon_inodes.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/uaccess.h> | |
45 | #include <linux/slab.h> | |
abc0446a | 46 | #include <linux/err.h> |
b13f3ebe | 47 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 48 | #include "wrapper/ringbuffer/vfs.h" |
d83004aa JD |
49 | #include "wrapper/ringbuffer/backend.h" |
50 | #include "wrapper/ringbuffer/frontend.h" | |
24cedcfe | 51 | #include "wrapper/poll.h" |
4ac10b76 | 52 | #include "wrapper/file.h" |
e8951e63 | 53 | #include "lttng-abi.h" |
6dccd6c1 | 54 | #include "lttng-abi-old.h" |
a90917c3 MD |
55 | #include "lttng-events.h" |
56 | #include "lttng-tracer.h" | |
3b731ab1 | 57 | #include "lib/ringbuffer/frontend_types.h" |
baf20995 MD |
58 | |
59 | /* | |
60 | * This is LTTng's own personal way to create a system call as an external | |
80996790 | 61 | * module. We use ioctl() on /proc/lttng. |
baf20995 MD |
62 | */ |
63 | ||
e6a17f26 | 64 | static struct proc_dir_entry *lttng_proc_dentry; |
ad1c05e1 MD |
65 | static const struct file_operations lttng_fops; |
66 | static const struct file_operations lttng_session_fops; | |
67 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 68 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 69 | static const struct file_operations lttng_event_fops; |
ed8d02d6 | 70 | static struct file_operations lttng_stream_ring_buffer_file_operations; |
baf20995 | 71 | |
9616f0bf JD |
72 | static int put_u64(uint64_t val, unsigned long arg); |
73 | ||
a33c9927 MD |
74 | /* |
75 | * Teardown management: opened file descriptors keep a refcount on the module, | |
76 | * so it can only exit when all file descriptors are closed. | |
77 | */ | |
78 | ||
ad1c05e1 | 79 | static |
baf20995 MD |
80 | int lttng_abi_create_session(void) |
81 | { | |
a90917c3 | 82 | struct lttng_session *session; |
c0e31d2e | 83 | struct file *session_file; |
11b5a3c2 | 84 | int session_fd, ret; |
baf20995 | 85 | |
a90917c3 | 86 | session = lttng_session_create(); |
baf20995 MD |
87 | if (!session) |
88 | return -ENOMEM; | |
4ac10b76 | 89 | session_fd = lttng_get_unused_fd(); |
baf20995 MD |
90 | if (session_fd < 0) { |
91 | ret = session_fd; | |
92 | goto fd_error; | |
93 | } | |
c0e31d2e | 94 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 95 | <tng_session_fops, |
baf20995 | 96 | session, O_RDWR); |
c0e31d2e MD |
97 | if (IS_ERR(session_file)) { |
98 | ret = PTR_ERR(session_file); | |
baf20995 MD |
99 | goto file_error; |
100 | } | |
c0e31d2e MD |
101 | session->file = session_file; |
102 | fd_install(session_fd, session_file); | |
baf20995 MD |
103 | return session_fd; |
104 | ||
105 | file_error: | |
106 | put_unused_fd(session_fd); | |
107 | fd_error: | |
a90917c3 | 108 | lttng_session_destroy(session); |
baf20995 MD |
109 | return ret; |
110 | } | |
111 | ||
271b6681 MD |
112 | static |
113 | int lttng_abi_tracepoint_list(void) | |
114 | { | |
115 | struct file *tracepoint_list_file; | |
116 | int file_fd, ret; | |
117 | ||
4ac10b76 | 118 | file_fd = lttng_get_unused_fd(); |
271b6681 MD |
119 | if (file_fd < 0) { |
120 | ret = file_fd; | |
121 | goto fd_error; | |
122 | } | |
30f18bf0 | 123 | |
8ee099b6 | 124 | tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]", |
271b6681 MD |
125 | <tng_tracepoint_list_fops, |
126 | NULL, O_RDWR); | |
127 | if (IS_ERR(tracepoint_list_file)) { | |
128 | ret = PTR_ERR(tracepoint_list_file); | |
129 | goto file_error; | |
130 | } | |
30f18bf0 MD |
131 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
132 | if (ret < 0) | |
133 | goto open_error; | |
271b6681 MD |
134 | fd_install(file_fd, tracepoint_list_file); |
135 | return file_fd; | |
136 | ||
30f18bf0 MD |
137 | open_error: |
138 | fput(tracepoint_list_file); | |
271b6681 MD |
139 | file_error: |
140 | put_unused_fd(file_fd); | |
141 | fd_error: | |
142 | return ret; | |
143 | } | |
144 | ||
f127e61e MD |
145 | #ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
146 | static inline | |
147 | int lttng_abi_syscall_list(void) | |
148 | { | |
149 | return -ENOSYS; | |
150 | } | |
151 | #else | |
152 | static | |
153 | int lttng_abi_syscall_list(void) | |
154 | { | |
155 | struct file *syscall_list_file; | |
156 | int file_fd, ret; | |
157 | ||
158 | file_fd = lttng_get_unused_fd(); | |
159 | if (file_fd < 0) { | |
160 | ret = file_fd; | |
161 | goto fd_error; | |
162 | } | |
163 | ||
164 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
165 | <tng_syscall_list_fops, | |
166 | NULL, O_RDWR); | |
167 | if (IS_ERR(syscall_list_file)) { | |
168 | ret = PTR_ERR(syscall_list_file); | |
169 | goto file_error; | |
170 | } | |
171 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
172 | if (ret < 0) | |
173 | goto open_error; | |
174 | fd_install(file_fd, syscall_list_file); | |
f127e61e MD |
175 | return file_fd; |
176 | ||
177 | open_error: | |
178 | fput(syscall_list_file); | |
179 | file_error: | |
180 | put_unused_fd(file_fd); | |
181 | fd_error: | |
182 | return ret; | |
183 | } | |
184 | #endif | |
185 | ||
80c16bcf | 186 | static |
6dccd6c1 | 187 | void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v) |
80c16bcf | 188 | { |
6dccd6c1 JD |
189 | v->major = LTTNG_MODULES_MAJOR_VERSION; |
190 | v->minor = LTTNG_MODULES_MINOR_VERSION; | |
191 | v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION; | |
80c16bcf MD |
192 | } |
193 | ||
42cabb80 MD |
194 | static |
195 | void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v) | |
196 | { | |
197 | v->major = LTTNG_MODULES_ABI_MAJOR_VERSION; | |
198 | v->minor = LTTNG_MODULES_ABI_MINOR_VERSION; | |
199 | } | |
200 | ||
8070f5c0 MD |
201 | static |
202 | long lttng_abi_add_context(struct file *file, | |
6dccd6c1 | 203 | struct lttng_kernel_context *context_param, |
a90917c3 | 204 | struct lttng_ctx **ctx, struct lttng_session *session) |
8070f5c0 | 205 | { |
8070f5c0 MD |
206 | |
207 | if (session->been_active) | |
208 | return -EPERM; | |
209 | ||
6dccd6c1 | 210 | switch (context_param->ctx) { |
12a313a5 | 211 | case LTTNG_KERNEL_CONTEXT_PID: |
8070f5c0 | 212 | return lttng_add_pid_to_ctx(ctx); |
a8ad3613 MD |
213 | case LTTNG_KERNEL_CONTEXT_PRIO: |
214 | return lttng_add_prio_to_ctx(ctx); | |
53f1f0ca MD |
215 | case LTTNG_KERNEL_CONTEXT_NICE: |
216 | return lttng_add_nice_to_ctx(ctx); | |
b64bc438 MD |
217 | case LTTNG_KERNEL_CONTEXT_VPID: |
218 | return lttng_add_vpid_to_ctx(ctx); | |
219 | case LTTNG_KERNEL_CONTEXT_TID: | |
220 | return lttng_add_tid_to_ctx(ctx); | |
221 | case LTTNG_KERNEL_CONTEXT_VTID: | |
222 | return lttng_add_vtid_to_ctx(ctx); | |
223 | case LTTNG_KERNEL_CONTEXT_PPID: | |
224 | return lttng_add_ppid_to_ctx(ctx); | |
225 | case LTTNG_KERNEL_CONTEXT_VPPID: | |
226 | return lttng_add_vppid_to_ctx(ctx); | |
12a313a5 | 227 | case LTTNG_KERNEL_CONTEXT_PERF_COUNTER: |
6dccd6c1 JD |
228 | context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
229 | return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type, | |
230 | context_param->u.perf_counter.config, | |
231 | context_param->u.perf_counter.name, | |
c24a0d71 | 232 | ctx); |
a2563e83 MD |
233 | case LTTNG_KERNEL_CONTEXT_PROCNAME: |
234 | return lttng_add_procname_to_ctx(ctx); | |
975da2c0 JD |
235 | case LTTNG_KERNEL_CONTEXT_HOSTNAME: |
236 | return lttng_add_hostname_to_ctx(ctx); | |
b3699d90 MD |
237 | case LTTNG_KERNEL_CONTEXT_CPU_ID: |
238 | return lttng_add_cpu_id_to_ctx(ctx); | |
8070f5c0 MD |
239 | default: |
240 | return -EINVAL; | |
241 | } | |
242 | } | |
243 | ||
ad1c05e1 MD |
244 | /** |
245 | * lttng_ioctl - lttng syscall through ioctl | |
246 | * | |
c0e31d2e | 247 | * @file: the file |
ad1c05e1 MD |
248 | * @cmd: the command |
249 | * @arg: command arg | |
250 | * | |
251 | * This ioctl implements lttng commands: | |
38d024ae | 252 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 253 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
254 | * LTTNG_KERNEL_TRACER_VERSION |
255 | * Returns the LTTng kernel tracer version | |
256 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
257 | * Returns a file descriptor listing available tracepoints | |
360f38ea MD |
258 | * LTTNG_KERNEL_WAIT_QUIESCENT |
259 | * Returns after all previously running probes have completed | |
42cabb80 MD |
260 | * LTTNG_KERNEL_TRACER_ABI_VERSION |
261 | * Returns the LTTng kernel tracer ABI version | |
ad1c05e1 MD |
262 | * |
263 | * The returned session will be deleted when its file descriptor is closed. | |
264 | */ | |
265 | static | |
c0e31d2e | 266 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
267 | { |
268 | switch (cmd) { | |
6dccd6c1 | 269 | case LTTNG_KERNEL_OLD_SESSION: |
38d024ae | 270 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 271 | return lttng_abi_create_session(); |
6dccd6c1 JD |
272 | case LTTNG_KERNEL_OLD_TRACER_VERSION: |
273 | { | |
274 | struct lttng_kernel_tracer_version v; | |
275 | struct lttng_kernel_old_tracer_version oldv; | |
276 | struct lttng_kernel_old_tracer_version *uversion = | |
277 | (struct lttng_kernel_old_tracer_version __user *) arg; | |
278 | ||
279 | lttng_abi_tracer_version(&v); | |
280 | oldv.major = v.major; | |
281 | oldv.minor = v.minor; | |
282 | oldv.patchlevel = v.patchlevel; | |
283 | ||
284 | if (copy_to_user(uversion, &oldv, sizeof(oldv))) | |
285 | return -EFAULT; | |
286 | return 0; | |
287 | } | |
80c16bcf | 288 | case LTTNG_KERNEL_TRACER_VERSION: |
6dccd6c1 JD |
289 | { |
290 | struct lttng_kernel_tracer_version version; | |
291 | struct lttng_kernel_tracer_version *uversion = | |
292 | (struct lttng_kernel_tracer_version __user *) arg; | |
293 | ||
294 | lttng_abi_tracer_version(&version); | |
42cabb80 MD |
295 | |
296 | if (copy_to_user(uversion, &version, sizeof(version))) | |
297 | return -EFAULT; | |
298 | return 0; | |
299 | } | |
300 | case LTTNG_KERNEL_TRACER_ABI_VERSION: | |
301 | { | |
302 | struct lttng_kernel_tracer_abi_version version; | |
303 | struct lttng_kernel_tracer_abi_version *uversion = | |
304 | (struct lttng_kernel_tracer_abi_version __user *) arg; | |
305 | ||
306 | lttng_abi_tracer_abi_version(&version); | |
307 | ||
6dccd6c1 JD |
308 | if (copy_to_user(uversion, &version, sizeof(version))) |
309 | return -EFAULT; | |
310 | return 0; | |
311 | } | |
312 | case LTTNG_KERNEL_OLD_TRACEPOINT_LIST: | |
271b6681 MD |
313 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
314 | return lttng_abi_tracepoint_list(); | |
2d2464bd MD |
315 | case LTTNG_KERNEL_SYSCALL_LIST: |
316 | return lttng_abi_syscall_list(); | |
6dccd6c1 | 317 | case LTTNG_KERNEL_OLD_WAIT_QUIESCENT: |
5f7f9078 MD |
318 | case LTTNG_KERNEL_WAIT_QUIESCENT: |
319 | synchronize_trace(); | |
320 | return 0; | |
6dccd6c1 JD |
321 | case LTTNG_KERNEL_OLD_CALIBRATE: |
322 | { | |
323 | struct lttng_kernel_old_calibrate __user *ucalibrate = | |
324 | (struct lttng_kernel_old_calibrate __user *) arg; | |
325 | struct lttng_kernel_old_calibrate old_calibrate; | |
326 | struct lttng_kernel_calibrate calibrate; | |
327 | int ret; | |
328 | ||
329 | if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate))) | |
330 | return -EFAULT; | |
331 | calibrate.type = old_calibrate.type; | |
332 | ret = lttng_calibrate(&calibrate); | |
333 | if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate))) | |
334 | return -EFAULT; | |
335 | return ret; | |
336 | } | |
57105fc2 MD |
337 | case LTTNG_KERNEL_CALIBRATE: |
338 | { | |
3db41b2c MD |
339 | struct lttng_kernel_calibrate __user *ucalibrate = |
340 | (struct lttng_kernel_calibrate __user *) arg; | |
341 | struct lttng_kernel_calibrate calibrate; | |
57105fc2 MD |
342 | int ret; |
343 | ||
344 | if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate))) | |
345 | return -EFAULT; | |
346 | ret = lttng_calibrate(&calibrate); | |
347 | if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate))) | |
348 | return -EFAULT; | |
349 | return ret; | |
350 | } | |
ad1c05e1 MD |
351 | default: |
352 | return -ENOIOCTLCMD; | |
353 | } | |
354 | } | |
355 | ||
ad1c05e1 | 356 | static const struct file_operations lttng_fops = { |
a33c9927 | 357 | .owner = THIS_MODULE, |
ad1c05e1 MD |
358 | .unlocked_ioctl = lttng_ioctl, |
359 | #ifdef CONFIG_COMPAT | |
03037b98 | 360 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 361 | #endif |
11b5a3c2 | 362 | }; |
ad1c05e1 | 363 | |
5dbbdb43 | 364 | static |
c0e31d2e | 365 | int lttng_abi_create_channel(struct file *session_file, |
6dccd6c1 | 366 | struct lttng_kernel_channel *chan_param, |
5dbbdb43 | 367 | enum channel_type channel_type) |
baf20995 | 368 | { |
a90917c3 | 369 | struct lttng_session *session = session_file->private_data; |
88dfd899 | 370 | const struct file_operations *fops = NULL; |
5dbbdb43 | 371 | const char *transport_name; |
a90917c3 | 372 | struct lttng_channel *chan; |
c0e31d2e | 373 | struct file *chan_file; |
baf20995 | 374 | int chan_fd; |
ad1c05e1 | 375 | int ret = 0; |
baf20995 | 376 | |
4ac10b76 | 377 | chan_fd = lttng_get_unused_fd(); |
baf20995 MD |
378 | if (chan_fd < 0) { |
379 | ret = chan_fd; | |
380 | goto fd_error; | |
381 | } | |
88dfd899 MD |
382 | switch (channel_type) { |
383 | case PER_CPU_CHANNEL: | |
384 | fops = <tng_channel_fops; | |
385 | break; | |
386 | case METADATA_CHANNEL: | |
387 | fops = <tng_metadata_fops; | |
388 | break; | |
389 | } | |
390 | ||
c0e31d2e | 391 | chan_file = anon_inode_getfile("[lttng_channel]", |
88dfd899 | 392 | fops, |
03037b98 | 393 | NULL, O_RDWR); |
c0e31d2e MD |
394 | if (IS_ERR(chan_file)) { |
395 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
396 | goto file_error; |
397 | } | |
5dbbdb43 MD |
398 | switch (channel_type) { |
399 | case PER_CPU_CHANNEL: | |
6dccd6c1 JD |
400 | if (chan_param->output == LTTNG_KERNEL_SPLICE) { |
401 | transport_name = chan_param->overwrite ? | |
96ba7208 | 402 | "relay-overwrite" : "relay-discard"; |
6dccd6c1 JD |
403 | } else if (chan_param->output == LTTNG_KERNEL_MMAP) { |
404 | transport_name = chan_param->overwrite ? | |
96ba7208 JD |
405 | "relay-overwrite-mmap" : "relay-discard-mmap"; |
406 | } else { | |
407 | return -EINVAL; | |
408 | } | |
5dbbdb43 | 409 | break; |
5dbbdb43 | 410 | case METADATA_CHANNEL: |
6dccd6c1 | 411 | if (chan_param->output == LTTNG_KERNEL_SPLICE) |
96ba7208 | 412 | transport_name = "relay-metadata"; |
6dccd6c1 | 413 | else if (chan_param->output == LTTNG_KERNEL_MMAP) |
96ba7208 JD |
414 | transport_name = "relay-metadata-mmap"; |
415 | else | |
416 | return -EINVAL; | |
5dbbdb43 MD |
417 | break; |
418 | default: | |
419 | transport_name = "<unknown>"; | |
420 | break; | |
421 | } | |
03037b98 MD |
422 | /* |
423 | * We tolerate no failure path after channel creation. It will stay | |
424 | * invariant for the rest of the session. | |
425 | */ | |
a90917c3 | 426 | chan = lttng_channel_create(session, transport_name, NULL, |
6dccd6c1 JD |
427 | chan_param->subbuf_size, |
428 | chan_param->num_subbuf, | |
429 | chan_param->switch_timer_interval, | |
d83004aa JD |
430 | chan_param->read_timer_interval, |
431 | channel_type); | |
03037b98 | 432 | if (!chan) { |
f3d01b96 | 433 | ret = -EINVAL; |
03037b98 MD |
434 | goto chan_error; |
435 | } | |
11b5a3c2 | 436 | chan->file = chan_file; |
c0e31d2e MD |
437 | chan_file->private_data = chan; |
438 | fd_install(chan_fd, chan_file); | |
b0caa15a | 439 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 440 | |
baf20995 MD |
441 | return chan_fd; |
442 | ||
03037b98 | 443 | chan_error: |
c0e31d2e | 444 | fput(chan_file); |
baf20995 MD |
445 | file_error: |
446 | put_unused_fd(chan_fd); | |
447 | fd_error: | |
baf20995 MD |
448 | return ret; |
449 | } | |
450 | ||
451 | /** | |
ad1c05e1 | 452 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 453 | * |
c0e31d2e | 454 | * @file: the file |
baf20995 MD |
455 | * @cmd: the command |
456 | * @arg: command arg | |
457 | * | |
458 | * This ioctl implements lttng commands: | |
38d024ae | 459 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 460 | * Returns a LTTng channel file descriptor |
e64957da MD |
461 | * LTTNG_KERNEL_ENABLE |
462 | * Enables tracing for a session (weak enable) | |
463 | * LTTNG_KERNEL_DISABLE | |
464 | * Disables tracing for a session (strong disable) | |
8070f5c0 MD |
465 | * LTTNG_KERNEL_METADATA |
466 | * Returns a LTTng metadata file descriptor | |
e0130fab MD |
467 | * LTTNG_KERNEL_SESSION_TRACK_PID |
468 | * Add PID to session tracker | |
469 | * LTTNG_KERNEL_SESSION_UNTRACK_PID | |
470 | * Remove PID from session tracker | |
ad1c05e1 MD |
471 | * |
472 | * The returned channel will be deleted when its file descriptor is closed. | |
473 | */ | |
474 | static | |
c0e31d2e | 475 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 476 | { |
a90917c3 | 477 | struct lttng_session *session = file->private_data; |
c0e31d2e | 478 | |
ad1c05e1 | 479 | switch (cmd) { |
6dccd6c1 JD |
480 | case LTTNG_KERNEL_OLD_CHANNEL: |
481 | { | |
482 | struct lttng_kernel_channel chan_param; | |
483 | struct lttng_kernel_old_channel old_chan_param; | |
484 | ||
485 | if (copy_from_user(&old_chan_param, | |
486 | (struct lttng_kernel_old_channel __user *) arg, | |
487 | sizeof(struct lttng_kernel_old_channel))) | |
488 | return -EFAULT; | |
489 | chan_param.overwrite = old_chan_param.overwrite; | |
490 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
491 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
492 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
493 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
494 | chan_param.output = old_chan_param.output; | |
495 | ||
496 | return lttng_abi_create_channel(file, &chan_param, | |
497 | PER_CPU_CHANNEL); | |
498 | } | |
38d024ae | 499 | case LTTNG_KERNEL_CHANNEL: |
6dccd6c1 JD |
500 | { |
501 | struct lttng_kernel_channel chan_param; | |
502 | ||
503 | if (copy_from_user(&chan_param, | |
38d024ae | 504 | (struct lttng_kernel_channel __user *) arg, |
6dccd6c1 JD |
505 | sizeof(struct lttng_kernel_channel))) |
506 | return -EFAULT; | |
507 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 508 | PER_CPU_CHANNEL); |
6dccd6c1 JD |
509 | } |
510 | case LTTNG_KERNEL_OLD_SESSION_START: | |
511 | case LTTNG_KERNEL_OLD_ENABLE: | |
38d024ae | 512 | case LTTNG_KERNEL_SESSION_START: |
e64957da | 513 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 514 | return lttng_session_enable(session); |
6dccd6c1 JD |
515 | case LTTNG_KERNEL_OLD_SESSION_STOP: |
516 | case LTTNG_KERNEL_OLD_DISABLE: | |
38d024ae | 517 | case LTTNG_KERNEL_SESSION_STOP: |
e64957da | 518 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 519 | return lttng_session_disable(session); |
6dccd6c1 JD |
520 | case LTTNG_KERNEL_OLD_METADATA: |
521 | { | |
522 | struct lttng_kernel_channel chan_param; | |
523 | struct lttng_kernel_old_channel old_chan_param; | |
524 | ||
525 | if (copy_from_user(&old_chan_param, | |
526 | (struct lttng_kernel_old_channel __user *) arg, | |
527 | sizeof(struct lttng_kernel_old_channel))) | |
528 | return -EFAULT; | |
529 | chan_param.overwrite = old_chan_param.overwrite; | |
530 | chan_param.subbuf_size = old_chan_param.subbuf_size; | |
531 | chan_param.num_subbuf = old_chan_param.num_subbuf; | |
532 | chan_param.switch_timer_interval = old_chan_param.switch_timer_interval; | |
533 | chan_param.read_timer_interval = old_chan_param.read_timer_interval; | |
534 | chan_param.output = old_chan_param.output; | |
535 | ||
536 | return lttng_abi_create_channel(file, &chan_param, | |
537 | METADATA_CHANNEL); | |
538 | } | |
38d024ae | 539 | case LTTNG_KERNEL_METADATA: |
6dccd6c1 JD |
540 | { |
541 | struct lttng_kernel_channel chan_param; | |
542 | ||
543 | if (copy_from_user(&chan_param, | |
544 | (struct lttng_kernel_channel __user *) arg, | |
545 | sizeof(struct lttng_kernel_channel))) | |
546 | return -EFAULT; | |
547 | return lttng_abi_create_channel(file, &chan_param, | |
5dbbdb43 | 548 | METADATA_CHANNEL); |
6dccd6c1 | 549 | } |
e0130fab MD |
550 | case LTTNG_KERNEL_SESSION_TRACK_PID: |
551 | return lttng_session_track_pid(session, (int) arg); | |
552 | case LTTNG_KERNEL_SESSION_UNTRACK_PID: | |
553 | return lttng_session_untrack_pid(session, (int) arg); | |
7e6f9ef6 MD |
554 | case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS: |
555 | return lttng_session_list_tracker_pids(session); | |
9616f0bf JD |
556 | case LTTNG_KERNEL_SESSION_METADATA_REGEN: |
557 | return lttng_session_metadata_regenerate(session); | |
ad1c05e1 MD |
558 | default: |
559 | return -ENOIOCTLCMD; | |
560 | } | |
561 | } | |
562 | ||
03037b98 MD |
563 | /* |
564 | * Called when the last file reference is dropped. | |
565 | * | |
566 | * Big fat note: channels and events are invariant for the whole session after | |
567 | * their creation. So this session destruction also destroys all channel and | |
568 | * event structures specific to this session (they are not destroyed when their | |
569 | * individual file is released). | |
570 | */ | |
ad1c05e1 | 571 | static |
03037b98 | 572 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 573 | { |
a90917c3 | 574 | struct lttng_session *session = file->private_data; |
c269fff4 MD |
575 | |
576 | if (session) | |
a90917c3 | 577 | lttng_session_destroy(session); |
11b5a3c2 | 578 | return 0; |
ad1c05e1 | 579 | } |
ad1c05e1 MD |
580 | |
581 | static const struct file_operations lttng_session_fops = { | |
a33c9927 | 582 | .owner = THIS_MODULE, |
03037b98 | 583 | .release = lttng_session_release, |
ad1c05e1 MD |
584 | .unlocked_ioctl = lttng_session_ioctl, |
585 | #ifdef CONFIG_COMPAT | |
03037b98 | 586 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 587 | #endif |
11b5a3c2 | 588 | }; |
ad1c05e1 | 589 | |
d83004aa JD |
590 | /** |
591 | * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation | |
592 | * @filp: the file | |
593 | * @wait: poll table | |
594 | * | |
595 | * Handles the poll operations for the metadata channels. | |
596 | */ | |
ad1c05e1 | 597 | static |
d83004aa JD |
598 | unsigned int lttng_metadata_ring_buffer_poll(struct file *filp, |
599 | poll_table *wait) | |
600 | { | |
601 | struct lttng_metadata_stream *stream = filp->private_data; | |
602 | struct lib_ring_buffer *buf = stream->priv; | |
603 | int finalized; | |
604 | unsigned int mask = 0; | |
605 | ||
606 | if (filp->f_mode & FMODE_READ) { | |
607 | poll_wait_set_exclusive(wait); | |
608 | poll_wait(filp, &stream->read_wait, wait); | |
609 | ||
610 | finalized = stream->finalized; | |
611 | ||
612 | /* | |
613 | * lib_ring_buffer_is_finalized() contains a smp_rmb() | |
614 | * ordering finalized load before offsets loads. | |
615 | */ | |
616 | WARN_ON(atomic_long_read(&buf->active_readers) != 1); | |
617 | ||
618 | if (finalized) | |
619 | mask |= POLLHUP; | |
620 | ||
92d9f5e6 | 621 | mutex_lock(&stream->metadata_cache->lock); |
d83004aa | 622 | if (stream->metadata_cache->metadata_written > |
f613e3e6 | 623 | stream->metadata_out) |
d83004aa | 624 | mask |= POLLIN; |
92d9f5e6 | 625 | mutex_unlock(&stream->metadata_cache->lock); |
d83004aa JD |
626 | } |
627 | ||
628 | return mask; | |
629 | } | |
630 | ||
f613e3e6 MD |
631 | static |
632 | void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp, | |
633 | unsigned int cmd, unsigned long arg) | |
634 | { | |
635 | struct lttng_metadata_stream *stream = filp->private_data; | |
636 | ||
637 | stream->metadata_out = stream->metadata_in; | |
638 | } | |
639 | ||
d83004aa JD |
640 | static |
641 | long lttng_metadata_ring_buffer_ioctl(struct file *filp, | |
642 | unsigned int cmd, unsigned long arg) | |
643 | { | |
644 | int ret; | |
645 | struct lttng_metadata_stream *stream = filp->private_data; | |
646 | struct lib_ring_buffer *buf = stream->priv; | |
647 | ||
648 | switch (cmd) { | |
d83004aa JD |
649 | case RING_BUFFER_GET_NEXT_SUBBUF: |
650 | { | |
35097f36 JD |
651 | struct lttng_metadata_stream *stream = filp->private_data; |
652 | struct lib_ring_buffer *buf = stream->priv; | |
653 | struct channel *chan = buf->backend.chan; | |
654 | ||
655 | ret = lttng_metadata_output_channel(stream, chan); | |
656 | if (ret > 0) { | |
657 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
658 | ret = 0; | |
659 | } else if (ret < 0) | |
d83004aa JD |
660 | goto err; |
661 | break; | |
662 | } | |
f613e3e6 MD |
663 | case RING_BUFFER_GET_SUBBUF: |
664 | { | |
665 | /* | |
666 | * Random access is not allowed for metadata channel. | |
667 | */ | |
668 | return -ENOSYS; | |
669 | } | |
35097f36 JD |
670 | case RING_BUFFER_FLUSH: |
671 | { | |
672 | struct lttng_metadata_stream *stream = filp->private_data; | |
673 | struct lib_ring_buffer *buf = stream->priv; | |
674 | struct channel *chan = buf->backend.chan; | |
675 | ||
676 | /* | |
677 | * Before doing the actual ring buffer flush, write up to one | |
678 | * packet of metadata in the ring buffer. | |
679 | */ | |
680 | ret = lttng_metadata_output_channel(stream, chan); | |
681 | if (ret < 0) | |
682 | goto err; | |
683 | break; | |
684 | } | |
9616f0bf JD |
685 | case RING_BUFFER_GET_METADATA_VERSION: |
686 | { | |
687 | struct lttng_metadata_stream *stream = filp->private_data; | |
688 | ||
689 | return put_u64(stream->version, arg); | |
690 | } | |
d83004aa JD |
691 | default: |
692 | break; | |
693 | } | |
f613e3e6 MD |
694 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
695 | ||
d83004aa | 696 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
697 | ret = lib_ring_buffer_ioctl(filp, cmd, arg, buf); |
698 | if (ret < 0) | |
699 | goto err; | |
d83004aa | 700 | |
f613e3e6 MD |
701 | switch (cmd) { |
702 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
703 | { | |
704 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
705 | cmd, arg); | |
706 | break; | |
707 | } | |
708 | default: | |
709 | break; | |
710 | } | |
d83004aa JD |
711 | err: |
712 | return ret; | |
713 | } | |
714 | ||
aeb9064d | 715 | #ifdef CONFIG_COMPAT |
d83004aa JD |
716 | static |
717 | long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp, | |
718 | unsigned int cmd, unsigned long arg) | |
719 | { | |
720 | int ret; | |
721 | struct lttng_metadata_stream *stream = filp->private_data; | |
722 | struct lib_ring_buffer *buf = stream->priv; | |
723 | ||
724 | switch (cmd) { | |
d83004aa JD |
725 | case RING_BUFFER_GET_NEXT_SUBBUF: |
726 | { | |
35097f36 JD |
727 | struct lttng_metadata_stream *stream = filp->private_data; |
728 | struct lib_ring_buffer *buf = stream->priv; | |
729 | struct channel *chan = buf->backend.chan; | |
730 | ||
731 | ret = lttng_metadata_output_channel(stream, chan); | |
732 | if (ret > 0) { | |
733 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE); | |
734 | ret = 0; | |
735 | } else if (ret < 0) | |
d83004aa JD |
736 | goto err; |
737 | break; | |
738 | } | |
f613e3e6 MD |
739 | case RING_BUFFER_GET_SUBBUF: |
740 | { | |
741 | /* | |
742 | * Random access is not allowed for metadata channel. | |
743 | */ | |
744 | return -ENOSYS; | |
745 | } | |
d83004aa JD |
746 | default: |
747 | break; | |
748 | } | |
f613e3e6 MD |
749 | /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */ |
750 | ||
d83004aa | 751 | /* Performing lib ring buffer ioctl after our own. */ |
f613e3e6 MD |
752 | ret = lib_ring_buffer_compat_ioctl(filp, cmd, arg, buf); |
753 | if (ret < 0) | |
754 | goto err; | |
d83004aa | 755 | |
f613e3e6 MD |
756 | switch (cmd) { |
757 | case RING_BUFFER_PUT_NEXT_SUBBUF: | |
758 | { | |
759 | lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp, | |
760 | cmd, arg); | |
761 | break; | |
762 | } | |
9616f0bf JD |
763 | case RING_BUFFER_GET_METADATA_VERSION: |
764 | { | |
765 | struct lttng_metadata_stream *stream = filp->private_data; | |
766 | ||
767 | return put_u64(stream->version, arg); | |
768 | } | |
f613e3e6 MD |
769 | default: |
770 | break; | |
771 | } | |
d83004aa JD |
772 | err: |
773 | return ret; | |
774 | } | |
aeb9064d | 775 | #endif |
d83004aa | 776 | |
b3b8072b MD |
777 | /* |
778 | * This is not used by anonymous file descriptors. This code is left | |
779 | * there if we ever want to implement an inode with open() operation. | |
780 | */ | |
d83004aa JD |
781 | static |
782 | int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file) | |
783 | { | |
784 | struct lttng_metadata_stream *stream = inode->i_private; | |
785 | struct lib_ring_buffer *buf = stream->priv; | |
786 | ||
787 | file->private_data = buf; | |
b3b8072b MD |
788 | /* |
789 | * Since life-time of metadata cache differs from that of | |
790 | * session, we need to keep our own reference on the transport. | |
791 | */ | |
792 | if (!try_module_get(stream->transport->owner)) { | |
793 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
794 | return -EBUSY; | |
795 | } | |
d83004aa JD |
796 | return lib_ring_buffer_open(inode, file, buf); |
797 | } | |
798 | ||
799 | static | |
800 | int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file) | |
801 | { | |
802 | struct lttng_metadata_stream *stream = file->private_data; | |
803 | struct lib_ring_buffer *buf = stream->priv; | |
804 | ||
805 | kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy); | |
b3b8072b | 806 | module_put(stream->transport->owner); |
d83004aa JD |
807 | return lib_ring_buffer_release(inode, file, buf); |
808 | } | |
809 | ||
810 | static | |
811 | ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos, | |
812 | struct pipe_inode_info *pipe, size_t len, | |
813 | unsigned int flags) | |
814 | { | |
815 | struct lttng_metadata_stream *stream = in->private_data; | |
816 | struct lib_ring_buffer *buf = stream->priv; | |
817 | ||
818 | return lib_ring_buffer_splice_read(in, ppos, pipe, len, | |
819 | flags, buf); | |
820 | } | |
821 | ||
822 | static | |
823 | int lttng_metadata_ring_buffer_mmap(struct file *filp, | |
824 | struct vm_area_struct *vma) | |
825 | { | |
826 | struct lttng_metadata_stream *stream = filp->private_data; | |
827 | struct lib_ring_buffer *buf = stream->priv; | |
828 | ||
829 | return lib_ring_buffer_mmap(filp, vma, buf); | |
830 | } | |
831 | ||
832 | static | |
833 | const struct file_operations lttng_metadata_ring_buffer_file_operations = { | |
834 | .owner = THIS_MODULE, | |
835 | .open = lttng_metadata_ring_buffer_open, | |
836 | .release = lttng_metadata_ring_buffer_release, | |
837 | .poll = lttng_metadata_ring_buffer_poll, | |
838 | .splice_read = lttng_metadata_ring_buffer_splice_read, | |
839 | .mmap = lttng_metadata_ring_buffer_mmap, | |
840 | .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl, | |
841 | .llseek = vfs_lib_ring_buffer_no_llseek, | |
842 | #ifdef CONFIG_COMPAT | |
843 | .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl, | |
844 | #endif | |
845 | }; | |
846 | ||
847 | static | |
848 | int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv, | |
849 | const struct file_operations *fops) | |
ad1c05e1 | 850 | { |
ad1c05e1 | 851 | int stream_fd, ret; |
11b5a3c2 | 852 | struct file *stream_file; |
ad1c05e1 | 853 | |
4ac10b76 | 854 | stream_fd = lttng_get_unused_fd(); |
ad1c05e1 MD |
855 | if (stream_fd < 0) { |
856 | ret = stream_fd; | |
857 | goto fd_error; | |
858 | } | |
d83004aa JD |
859 | stream_file = anon_inode_getfile("[lttng_stream]", fops, |
860 | stream_priv, O_RDWR); | |
c0e31d2e MD |
861 | if (IS_ERR(stream_file)) { |
862 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
863 | goto file_error; |
864 | } | |
409453cb MD |
865 | /* |
866 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
867 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
868 | * file descriptor, so we set FMODE_PREAD here. | |
869 | */ | |
d7b6f197 | 870 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 871 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
872 | /* |
873 | * The stream holds a reference to the channel within the generic ring | |
874 | * buffer library, so no need to hold a refcount on the channel and | |
875 | * session files here. | |
876 | */ | |
ad1c05e1 MD |
877 | return stream_fd; |
878 | ||
879 | file_error: | |
880 | put_unused_fd(stream_fd); | |
d83004aa JD |
881 | fd_error: |
882 | return ret; | |
883 | } | |
884 | ||
885 | static | |
886 | int lttng_abi_open_stream(struct file *channel_file) | |
887 | { | |
888 | struct lttng_channel *channel = channel_file->private_data; | |
889 | struct lib_ring_buffer *buf; | |
890 | int ret; | |
891 | void *stream_priv; | |
892 | ||
893 | buf = channel->ops->buffer_read_open(channel->chan); | |
894 | if (!buf) | |
895 | return -ENOENT; | |
896 | ||
897 | stream_priv = buf; | |
898 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, | |
ed8d02d6 | 899 | <tng_stream_ring_buffer_file_operations); |
d83004aa JD |
900 | if (ret < 0) |
901 | goto fd_error; | |
902 | ||
903 | return ret; | |
904 | ||
905 | fd_error: | |
906 | channel->ops->buffer_read_close(buf); | |
907 | return ret; | |
908 | } | |
909 | ||
910 | static | |
911 | int lttng_abi_open_metadata_stream(struct file *channel_file) | |
912 | { | |
913 | struct lttng_channel *channel = channel_file->private_data; | |
914 | struct lttng_session *session = channel->session; | |
915 | struct lib_ring_buffer *buf; | |
916 | int ret; | |
917 | struct lttng_metadata_stream *metadata_stream; | |
918 | void *stream_priv; | |
919 | ||
920 | buf = channel->ops->buffer_read_open(channel->chan); | |
921 | if (!buf) | |
922 | return -ENOENT; | |
923 | ||
924 | metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream), | |
925 | GFP_KERNEL); | |
b3b8072b MD |
926 | if (!metadata_stream) { |
927 | ret = -ENOMEM; | |
928 | goto nomem; | |
929 | } | |
d83004aa JD |
930 | metadata_stream->metadata_cache = session->metadata_cache; |
931 | init_waitqueue_head(&metadata_stream->read_wait); | |
932 | metadata_stream->priv = buf; | |
933 | stream_priv = metadata_stream; | |
b3b8072b MD |
934 | metadata_stream->transport = channel->transport; |
935 | ||
936 | /* | |
937 | * Since life-time of metadata cache differs from that of | |
938 | * session, we need to keep our own reference on the transport. | |
939 | */ | |
940 | if (!try_module_get(metadata_stream->transport->owner)) { | |
941 | printk(KERN_WARNING "LTT : Can't lock transport module.\n"); | |
942 | ret = -EINVAL; | |
943 | goto notransport; | |
944 | } | |
945 | ||
d83004aa JD |
946 | ret = lttng_abi_create_stream_fd(channel_file, stream_priv, |
947 | <tng_metadata_ring_buffer_file_operations); | |
948 | if (ret < 0) | |
949 | goto fd_error; | |
950 | ||
951 | kref_get(&session->metadata_cache->refcount); | |
952 | list_add(&metadata_stream->list, | |
953 | &session->metadata_cache->metadata_stream); | |
954 | return ret; | |
955 | ||
ad1c05e1 | 956 | fd_error: |
b3b8072b MD |
957 | module_put(metadata_stream->transport->owner); |
958 | notransport: | |
959 | kfree(metadata_stream); | |
960 | nomem: | |
11b5a3c2 | 961 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
962 | return ret; |
963 | } | |
964 | ||
653fe716 | 965 | static |
c0e31d2e | 966 | int lttng_abi_create_event(struct file *channel_file, |
6dccd6c1 | 967 | struct lttng_kernel_event *event_param) |
653fe716 | 968 | { |
a90917c3 | 969 | struct lttng_channel *channel = channel_file->private_data; |
653fe716 | 970 | int event_fd, ret; |
11b5a3c2 | 971 | struct file *event_file; |
3c997079 | 972 | void *priv; |
653fe716 | 973 | |
6dccd6c1 JD |
974 | event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
975 | switch (event_param->instrumentation) { | |
7371f44c | 976 | case LTTNG_KERNEL_KRETPROBE: |
6dccd6c1 | 977 | event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
7371f44c | 978 | break; |
ab2277d6 | 979 | case LTTNG_KERNEL_KPROBE: |
6dccd6c1 | 980 | event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 981 | break; |
ab2277d6 | 982 | case LTTNG_KERNEL_FUNCTION: |
6dccd6c1 | 983 | event_param->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 MD |
984 | break; |
985 | default: | |
986 | break; | |
987 | } | |
33a39a3c MD |
988 | event_fd = lttng_get_unused_fd(); |
989 | if (event_fd < 0) { | |
990 | ret = event_fd; | |
991 | goto fd_error; | |
992 | } | |
993 | event_file = anon_inode_getfile("[lttng_event]", | |
994 | <tng_event_fops, | |
995 | NULL, O_RDWR); | |
996 | if (IS_ERR(event_file)) { | |
997 | ret = PTR_ERR(event_file); | |
998 | goto file_error; | |
999 | } | |
1000 | if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT | |
1001 | || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) { | |
1002 | struct lttng_enabler *enabler; | |
1003 | ||
1004 | if (event_param->name[strlen(event_param->name) - 1] == '*') { | |
1005 | enabler = lttng_enabler_create(LTTNG_ENABLER_WILDCARD, | |
1006 | event_param, channel); | |
3c997079 | 1007 | } else { |
33a39a3c MD |
1008 | enabler = lttng_enabler_create(LTTNG_ENABLER_NAME, |
1009 | event_param, channel); | |
1ec65de1 | 1010 | } |
33a39a3c MD |
1011 | priv = enabler; |
1012 | } else { | |
1013 | struct lttng_event *event; | |
4ee2453d | 1014 | |
33a39a3c MD |
1015 | /* |
1016 | * We tolerate no failure path after event creation. It | |
1017 | * will stay invariant for the rest of the session. | |
1018 | */ | |
1019 | event = lttng_event_create(channel, event_param, | |
1020 | NULL, NULL, | |
1021 | event_param->instrumentation); | |
1022 | WARN_ON_ONCE(!event); | |
1023 | if (IS_ERR(event)) { | |
1024 | ret = PTR_ERR(event); | |
1025 | goto event_error; | |
80f87dd2 | 1026 | } |
33a39a3c | 1027 | priv = event; |
03037b98 | 1028 | } |
33a39a3c MD |
1029 | event_file->private_data = priv; |
1030 | fd_install(event_fd, event_file); | |
1031 | /* The event holds a reference on the channel */ | |
1032 | atomic_long_inc(&channel_file->f_count); | |
653fe716 MD |
1033 | return event_fd; |
1034 | ||
03037b98 | 1035 | event_error: |
c0e31d2e | 1036 | fput(event_file); |
653fe716 MD |
1037 | file_error: |
1038 | put_unused_fd(event_fd); | |
1039 | fd_error: | |
653fe716 MD |
1040 | return ret; |
1041 | } | |
ad1c05e1 MD |
1042 | |
1043 | /** | |
1044 | * lttng_channel_ioctl - lttng syscall through ioctl | |
1045 | * | |
c0e31d2e | 1046 | * @file: the file |
ad1c05e1 MD |
1047 | * @cmd: the command |
1048 | * @arg: command arg | |
1049 | * | |
1050 | * This ioctl implements lttng commands: | |
38d024ae | 1051 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
1052 | * Returns an event stream file descriptor or failure. |
1053 | * (typically, one event stream records events from one CPU) | |
38d024ae | 1054 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 1055 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
1056 | * LTTNG_KERNEL_CONTEXT |
1057 | * Prepend a context field to each event in the channel | |
e64957da MD |
1058 | * LTTNG_KERNEL_ENABLE |
1059 | * Enable recording for events in this channel (weak enable) | |
1060 | * LTTNG_KERNEL_DISABLE | |
1061 | * Disable recording for events in this channel (strong disable) | |
baf20995 | 1062 | * |
baf20995 MD |
1063 | * Channel and event file descriptors also hold a reference on the session. |
1064 | */ | |
ad1c05e1 | 1065 | static |
c0e31d2e | 1066 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 1067 | { |
a90917c3 | 1068 | struct lttng_channel *channel = file->private_data; |
8070f5c0 | 1069 | |
baf20995 | 1070 | switch (cmd) { |
6dccd6c1 | 1071 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1072 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 1073 | return lttng_abi_open_stream(file); |
6dccd6c1 JD |
1074 | case LTTNG_KERNEL_OLD_EVENT: |
1075 | { | |
1076 | struct lttng_kernel_event *uevent_param; | |
1077 | struct lttng_kernel_old_event *old_uevent_param; | |
1078 | int ret; | |
1079 | ||
1080 | uevent_param = kmalloc(sizeof(struct lttng_kernel_event), | |
1081 | GFP_KERNEL); | |
1082 | if (!uevent_param) { | |
1083 | ret = -ENOMEM; | |
1084 | goto old_event_end; | |
1085 | } | |
1086 | old_uevent_param = kmalloc( | |
1087 | sizeof(struct lttng_kernel_old_event), | |
1088 | GFP_KERNEL); | |
1089 | if (!old_uevent_param) { | |
1090 | ret = -ENOMEM; | |
1091 | goto old_event_error_free_param; | |
1092 | } | |
1093 | if (copy_from_user(old_uevent_param, | |
1094 | (struct lttng_kernel_old_event __user *) arg, | |
1095 | sizeof(struct lttng_kernel_old_event))) { | |
1096 | ret = -EFAULT; | |
1097 | goto old_event_error_free_old_param; | |
1098 | } | |
1099 | ||
1100 | memcpy(uevent_param->name, old_uevent_param->name, | |
1101 | sizeof(uevent_param->name)); | |
1102 | uevent_param->instrumentation = | |
1103 | old_uevent_param->instrumentation; | |
1104 | ||
1105 | switch (old_uevent_param->instrumentation) { | |
1106 | case LTTNG_KERNEL_KPROBE: | |
1107 | uevent_param->u.kprobe.addr = | |
1108 | old_uevent_param->u.kprobe.addr; | |
1109 | uevent_param->u.kprobe.offset = | |
1110 | old_uevent_param->u.kprobe.offset; | |
1111 | memcpy(uevent_param->u.kprobe.symbol_name, | |
1112 | old_uevent_param->u.kprobe.symbol_name, | |
1113 | sizeof(uevent_param->u.kprobe.symbol_name)); | |
1114 | break; | |
1115 | case LTTNG_KERNEL_KRETPROBE: | |
1116 | uevent_param->u.kretprobe.addr = | |
1117 | old_uevent_param->u.kretprobe.addr; | |
1118 | uevent_param->u.kretprobe.offset = | |
1119 | old_uevent_param->u.kretprobe.offset; | |
1120 | memcpy(uevent_param->u.kretprobe.symbol_name, | |
1121 | old_uevent_param->u.kretprobe.symbol_name, | |
1122 | sizeof(uevent_param->u.kretprobe.symbol_name)); | |
1123 | break; | |
1124 | case LTTNG_KERNEL_FUNCTION: | |
1125 | memcpy(uevent_param->u.ftrace.symbol_name, | |
1126 | old_uevent_param->u.ftrace.symbol_name, | |
1127 | sizeof(uevent_param->u.ftrace.symbol_name)); | |
1128 | break; | |
1129 | default: | |
1130 | break; | |
1131 | } | |
1132 | ret = lttng_abi_create_event(file, uevent_param); | |
1133 | ||
1134 | old_event_error_free_old_param: | |
1135 | kfree(old_uevent_param); | |
1136 | old_event_error_free_param: | |
1137 | kfree(uevent_param); | |
1138 | old_event_end: | |
1139 | return ret; | |
1140 | } | |
38d024ae | 1141 | case LTTNG_KERNEL_EVENT: |
6dccd6c1 JD |
1142 | { |
1143 | struct lttng_kernel_event uevent_param; | |
1144 | ||
1145 | if (copy_from_user(&uevent_param, | |
1146 | (struct lttng_kernel_event __user *) arg, | |
1147 | sizeof(uevent_param))) | |
1148 | return -EFAULT; | |
1149 | return lttng_abi_create_event(file, &uevent_param); | |
1150 | } | |
1151 | case LTTNG_KERNEL_OLD_CONTEXT: | |
1152 | { | |
1153 | struct lttng_kernel_context *ucontext_param; | |
1154 | struct lttng_kernel_old_context *old_ucontext_param; | |
1155 | int ret; | |
1156 | ||
1157 | ucontext_param = kmalloc(sizeof(struct lttng_kernel_context), | |
1158 | GFP_KERNEL); | |
1159 | if (!ucontext_param) { | |
1160 | ret = -ENOMEM; | |
1161 | goto old_ctx_end; | |
1162 | } | |
1163 | old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context), | |
1164 | GFP_KERNEL); | |
1165 | if (!old_ucontext_param) { | |
1166 | ret = -ENOMEM; | |
1167 | goto old_ctx_error_free_param; | |
1168 | } | |
1169 | ||
1170 | if (copy_from_user(old_ucontext_param, | |
1171 | (struct lttng_kernel_old_context __user *) arg, | |
1172 | sizeof(struct lttng_kernel_old_context))) { | |
1173 | ret = -EFAULT; | |
1174 | goto old_ctx_error_free_old_param; | |
1175 | } | |
1176 | ucontext_param->ctx = old_ucontext_param->ctx; | |
1177 | memcpy(ucontext_param->padding, old_ucontext_param->padding, | |
1178 | sizeof(ucontext_param->padding)); | |
1179 | /* only type that uses the union */ | |
1180 | if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) { | |
1181 | ucontext_param->u.perf_counter.type = | |
1182 | old_ucontext_param->u.perf_counter.type; | |
1183 | ucontext_param->u.perf_counter.config = | |
1184 | old_ucontext_param->u.perf_counter.config; | |
1185 | memcpy(ucontext_param->u.perf_counter.name, | |
1186 | old_ucontext_param->u.perf_counter.name, | |
1187 | sizeof(ucontext_param->u.perf_counter.name)); | |
1188 | } | |
1189 | ||
1190 | ret = lttng_abi_add_context(file, | |
1191 | ucontext_param, | |
1192 | &channel->ctx, channel->session); | |
1193 | ||
1194 | old_ctx_error_free_old_param: | |
1195 | kfree(old_ucontext_param); | |
1196 | old_ctx_error_free_param: | |
1197 | kfree(ucontext_param); | |
1198 | old_ctx_end: | |
1199 | return ret; | |
1200 | } | |
8070f5c0 | 1201 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 JD |
1202 | { |
1203 | struct lttng_kernel_context ucontext_param; | |
1204 | ||
1205 | if (copy_from_user(&ucontext_param, | |
8070f5c0 | 1206 | (struct lttng_kernel_context __user *) arg, |
6dccd6c1 JD |
1207 | sizeof(ucontext_param))) |
1208 | return -EFAULT; | |
1209 | return lttng_abi_add_context(file, | |
1210 | &ucontext_param, | |
8070f5c0 | 1211 | &channel->ctx, channel->session); |
6dccd6c1 JD |
1212 | } |
1213 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1214 | case LTTNG_KERNEL_ENABLE: |
a90917c3 | 1215 | return lttng_channel_enable(channel); |
6dccd6c1 | 1216 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1217 | case LTTNG_KERNEL_DISABLE: |
a90917c3 | 1218 | return lttng_channel_disable(channel); |
12e579db MD |
1219 | case LTTNG_KERNEL_SYSCALL_MASK: |
1220 | return lttng_channel_syscall_mask(channel, | |
1221 | (struct lttng_kernel_syscall_mask __user *) arg); | |
baf20995 MD |
1222 | default: |
1223 | return -ENOIOCTLCMD; | |
1224 | } | |
6dccd6c1 | 1225 | |
baf20995 MD |
1226 | } |
1227 | ||
5dbbdb43 MD |
1228 | /** |
1229 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
1230 | * | |
1231 | * @file: the file | |
1232 | * @cmd: the command | |
1233 | * @arg: command arg | |
1234 | * | |
1235 | * This ioctl implements lttng commands: | |
38d024ae | 1236 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
1237 | * Returns an event stream file descriptor or failure. |
1238 | * | |
1239 | * Channel and event file descriptors also hold a reference on the session. | |
1240 | */ | |
1241 | static | |
1242 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1243 | { | |
1244 | switch (cmd) { | |
6dccd6c1 | 1245 | case LTTNG_KERNEL_OLD_STREAM: |
38d024ae | 1246 | case LTTNG_KERNEL_STREAM: |
d83004aa | 1247 | return lttng_abi_open_metadata_stream(file); |
5dbbdb43 MD |
1248 | default: |
1249 | return -ENOIOCTLCMD; | |
1250 | } | |
1251 | } | |
1252 | ||
653fe716 MD |
1253 | /** |
1254 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
1255 | * | |
c0e31d2e | 1256 | * @file: the file |
653fe716 MD |
1257 | * @wait: poll table |
1258 | */ | |
c0e31d2e | 1259 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 1260 | { |
a90917c3 | 1261 | struct lttng_channel *channel = file->private_data; |
653fe716 MD |
1262 | unsigned int mask = 0; |
1263 | ||
c0e31d2e | 1264 | if (file->f_mode & FMODE_READ) { |
a33e44a6 | 1265 | poll_wait_set_exclusive(wait); |
24cedcfe MD |
1266 | poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan), |
1267 | wait); | |
653fe716 | 1268 | |
254ec7bc MD |
1269 | if (channel->ops->is_disabled(channel->chan)) |
1270 | return POLLERR; | |
24cedcfe | 1271 | if (channel->ops->is_finalized(channel->chan)) |
653fe716 | 1272 | return POLLHUP; |
f71ecafa | 1273 | if (channel->ops->buffer_has_read_closed_stream(channel->chan)) |
653fe716 | 1274 | return POLLIN | POLLRDNORM; |
f71ecafa | 1275 | return 0; |
653fe716 MD |
1276 | } |
1277 | return mask; | |
1278 | ||
1279 | } | |
1280 | ||
0a84a57f MD |
1281 | static |
1282 | int lttng_channel_release(struct inode *inode, struct file *file) | |
1283 | { | |
a90917c3 | 1284 | struct lttng_channel *channel = file->private_data; |
c269fff4 MD |
1285 | |
1286 | if (channel) | |
1287 | fput(channel->session->file); | |
0a84a57f MD |
1288 | return 0; |
1289 | } | |
1290 | ||
d83004aa JD |
1291 | static |
1292 | int lttng_metadata_channel_release(struct inode *inode, struct file *file) | |
1293 | { | |
1294 | struct lttng_channel *channel = file->private_data; | |
1295 | ||
1296 | if (channel) { | |
d83004aa | 1297 | fput(channel->session->file); |
a3381417 | 1298 | lttng_metadata_channel_destroy(channel); |
d83004aa JD |
1299 | } |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
ad1c05e1 | 1304 | static const struct file_operations lttng_channel_fops = { |
a33c9927 | 1305 | .owner = THIS_MODULE, |
03037b98 | 1306 | .release = lttng_channel_release, |
653fe716 | 1307 | .poll = lttng_channel_poll, |
ad1c05e1 | 1308 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 1309 | #ifdef CONFIG_COMPAT |
03037b98 | 1310 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 1311 | #endif |
11b5a3c2 | 1312 | }; |
baf20995 | 1313 | |
5dbbdb43 | 1314 | static const struct file_operations lttng_metadata_fops = { |
a33c9927 | 1315 | .owner = THIS_MODULE, |
d83004aa | 1316 | .release = lttng_metadata_channel_release, |
5dbbdb43 MD |
1317 | .unlocked_ioctl = lttng_metadata_ioctl, |
1318 | #ifdef CONFIG_COMPAT | |
1319 | .compat_ioctl = lttng_metadata_ioctl, | |
1320 | #endif | |
1321 | }; | |
1322 | ||
8070f5c0 MD |
1323 | /** |
1324 | * lttng_event_ioctl - lttng syscall through ioctl | |
1325 | * | |
1326 | * @file: the file | |
1327 | * @cmd: the command | |
1328 | * @arg: command arg | |
1329 | * | |
1330 | * This ioctl implements lttng commands: | |
8070f5c0 MD |
1331 | * LTTNG_KERNEL_CONTEXT |
1332 | * Prepend a context field to each record of this event | |
e64957da MD |
1333 | * LTTNG_KERNEL_ENABLE |
1334 | * Enable recording for this event (weak enable) | |
1335 | * LTTNG_KERNEL_DISABLE | |
1336 | * Disable recording for this event (strong disable) | |
8070f5c0 MD |
1337 | */ |
1338 | static | |
1339 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1340 | { | |
3c997079 MD |
1341 | struct lttng_event *event; |
1342 | struct lttng_enabler *enabler; | |
1343 | enum lttng_event_type *evtype = file->private_data; | |
8070f5c0 MD |
1344 | |
1345 | switch (cmd) { | |
6dccd6c1 JD |
1346 | case LTTNG_KERNEL_OLD_CONTEXT: |
1347 | { | |
3c997079 MD |
1348 | /* Not implemented */ |
1349 | return -ENOSYS; | |
6dccd6c1 | 1350 | } |
8070f5c0 | 1351 | case LTTNG_KERNEL_CONTEXT: |
6dccd6c1 | 1352 | { |
3c997079 MD |
1353 | /* Not implemented */ |
1354 | return -ENOSYS; | |
6dccd6c1 JD |
1355 | } |
1356 | case LTTNG_KERNEL_OLD_ENABLE: | |
e64957da | 1357 | case LTTNG_KERNEL_ENABLE: |
3c997079 MD |
1358 | switch (*evtype) { |
1359 | case LTTNG_TYPE_EVENT: | |
1360 | event = file->private_data; | |
1361 | return lttng_event_enable(event); | |
1362 | case LTTNG_TYPE_ENABLER: | |
1363 | enabler = file->private_data; | |
1364 | return lttng_enabler_enable(enabler); | |
1365 | default: | |
1366 | WARN_ON_ONCE(1); | |
1367 | return -ENOSYS; | |
1368 | } | |
6dccd6c1 | 1369 | case LTTNG_KERNEL_OLD_DISABLE: |
e64957da | 1370 | case LTTNG_KERNEL_DISABLE: |
3c997079 MD |
1371 | switch (*evtype) { |
1372 | case LTTNG_TYPE_EVENT: | |
1373 | event = file->private_data; | |
1374 | return lttng_event_disable(event); | |
1375 | case LTTNG_TYPE_ENABLER: | |
1376 | enabler = file->private_data; | |
1377 | return lttng_enabler_disable(enabler); | |
1378 | default: | |
1379 | WARN_ON_ONCE(1); | |
1380 | return -ENOSYS; | |
1381 | } | |
07dfc1d0 MD |
1382 | case LTTNG_KERNEL_FILTER: |
1383 | switch (*evtype) { | |
1384 | case LTTNG_TYPE_EVENT: | |
1385 | return -EINVAL; | |
1386 | case LTTNG_TYPE_ENABLER: | |
1387 | { | |
1388 | enabler = file->private_data; | |
1389 | return lttng_enabler_attach_bytecode(enabler, | |
1390 | (struct lttng_kernel_filter_bytecode __user *) arg); | |
1391 | } | |
1392 | ||
1393 | } | |
8070f5c0 MD |
1394 | default: |
1395 | return -ENOIOCTLCMD; | |
1396 | } | |
1397 | } | |
1398 | ||
0a84a57f MD |
1399 | static |
1400 | int lttng_event_release(struct inode *inode, struct file *file) | |
1401 | { | |
3c997079 MD |
1402 | struct lttng_event *event; |
1403 | struct lttng_enabler *enabler; | |
1404 | enum lttng_event_type *evtype = file->private_data; | |
1405 | ||
1406 | if (!evtype) | |
1407 | return 0; | |
1408 | ||
1409 | switch (*evtype) { | |
1410 | case LTTNG_TYPE_EVENT: | |
1411 | event = file->private_data; | |
1412 | if (event) | |
1413 | fput(event->chan->file); | |
1414 | break; | |
1415 | case LTTNG_TYPE_ENABLER: | |
1416 | enabler = file->private_data; | |
1417 | if (enabler) | |
1418 | fput(enabler->chan->file); | |
1419 | break; | |
1420 | default: | |
1421 | WARN_ON_ONCE(1); | |
1422 | break; | |
1423 | } | |
c269fff4 | 1424 | |
0a84a57f MD |
1425 | return 0; |
1426 | } | |
1427 | ||
3b923e5b | 1428 | /* TODO: filter control ioctl */ |
0a84a57f | 1429 | static const struct file_operations lttng_event_fops = { |
a33c9927 | 1430 | .owner = THIS_MODULE, |
0a84a57f | 1431 | .release = lttng_event_release, |
8070f5c0 MD |
1432 | .unlocked_ioctl = lttng_event_ioctl, |
1433 | #ifdef CONFIG_COMPAT | |
1434 | .compat_ioctl = lttng_event_ioctl, | |
1435 | #endif | |
11b5a3c2 | 1436 | }; |
0a84a57f | 1437 | |
3b731ab1 JD |
1438 | static int put_u64(uint64_t val, unsigned long arg) |
1439 | { | |
1440 | return put_user(val, (uint64_t __user *) arg); | |
1441 | } | |
1442 | ||
ed8d02d6 JD |
1443 | static long lttng_stream_ring_buffer_ioctl(struct file *filp, |
1444 | unsigned int cmd, unsigned long arg) | |
1445 | { | |
3b731ab1 JD |
1446 | struct lib_ring_buffer *buf = filp->private_data; |
1447 | struct channel *chan = buf->backend.chan; | |
1448 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1449 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1450 | int ret; |
1451 | ||
1452 | if (atomic_read(&chan->record_disabled)) | |
1453 | return -EIO; | |
1454 | ||
ed8d02d6 | 1455 | switch (cmd) { |
3b731ab1 JD |
1456 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN: |
1457 | { | |
1458 | uint64_t ts; | |
1459 | ||
dd5a0db3 | 1460 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1461 | if (ret < 0) |
1462 | goto error; | |
1463 | return put_u64(ts, arg); | |
1464 | } | |
1465 | case LTTNG_RING_BUFFER_GET_TIMESTAMP_END: | |
1466 | { | |
1467 | uint64_t ts; | |
1468 | ||
dd5a0db3 | 1469 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1470 | if (ret < 0) |
1471 | goto error; | |
1472 | return put_u64(ts, arg); | |
1473 | } | |
1474 | case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED: | |
1475 | { | |
1476 | uint64_t ed; | |
1477 | ||
dd5a0db3 | 1478 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1479 | if (ret < 0) |
1480 | goto error; | |
1481 | return put_u64(ed, arg); | |
1482 | } | |
1483 | case LTTNG_RING_BUFFER_GET_CONTENT_SIZE: | |
1484 | { | |
1485 | uint64_t cs; | |
1486 | ||
dd5a0db3 | 1487 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1488 | if (ret < 0) |
1489 | goto error; | |
1490 | return put_u64(cs, arg); | |
1491 | } | |
1492 | case LTTNG_RING_BUFFER_GET_PACKET_SIZE: | |
1493 | { | |
1494 | uint64_t ps; | |
1495 | ||
dd5a0db3 | 1496 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1497 | if (ret < 0) |
1498 | goto error; | |
1499 | return put_u64(ps, arg); | |
1500 | } | |
1501 | case LTTNG_RING_BUFFER_GET_STREAM_ID: | |
1502 | { | |
1503 | uint64_t si; | |
1504 | ||
dd5a0db3 | 1505 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1506 | if (ret < 0) |
1507 | goto error; | |
1508 | return put_u64(si, arg); | |
1509 | } | |
2348ca17 JD |
1510 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1511 | { | |
1512 | uint64_t ts; | |
1513 | ||
dd5a0db3 | 1514 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1515 | if (ret < 0) |
1516 | goto error; | |
1517 | return put_u64(ts, arg); | |
1518 | } | |
5b3cf4f9 JD |
1519 | case LTTNG_RING_BUFFER_GET_SEQ_NUM: |
1520 | { | |
1521 | uint64_t seq; | |
1522 | ||
1523 | ret = ops->sequence_number(config, buf, &seq); | |
1524 | if (ret < 0) | |
1525 | goto error; | |
1526 | return put_u64(seq, arg); | |
1527 | } | |
5594698f JD |
1528 | case LTTNG_RING_BUFFER_INSTANCE_ID: |
1529 | { | |
1530 | uint64_t id; | |
1531 | ||
1532 | ret = ops->instance_id(config, buf, &id); | |
1533 | if (ret < 0) | |
1534 | goto error; | |
1535 | return put_u64(id, arg); | |
1536 | } | |
3b731ab1 JD |
1537 | default: |
1538 | return lib_ring_buffer_file_operations.unlocked_ioctl(filp, | |
1539 | cmd, arg); | |
ed8d02d6 | 1540 | } |
3b731ab1 JD |
1541 | |
1542 | error: | |
1543 | return -ENOSYS; | |
ed8d02d6 JD |
1544 | } |
1545 | ||
1546 | #ifdef CONFIG_COMPAT | |
1547 | static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp, | |
1548 | unsigned int cmd, unsigned long arg) | |
1549 | { | |
3b731ab1 JD |
1550 | struct lib_ring_buffer *buf = filp->private_data; |
1551 | struct channel *chan = buf->backend.chan; | |
1552 | const struct lib_ring_buffer_config *config = &chan->backend.config; | |
dd5a0db3 | 1553 | const struct lttng_channel_ops *ops = chan->backend.priv_ops; |
3b731ab1 JD |
1554 | int ret; |
1555 | ||
1556 | if (atomic_read(&chan->record_disabled)) | |
1557 | return -EIO; | |
1558 | ||
ed8d02d6 | 1559 | switch (cmd) { |
3b731ab1 JD |
1560 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN: |
1561 | { | |
1562 | uint64_t ts; | |
1563 | ||
dd5a0db3 | 1564 | ret = ops->timestamp_begin(config, buf, &ts); |
3b731ab1 JD |
1565 | if (ret < 0) |
1566 | goto error; | |
1567 | return put_u64(ts, arg); | |
1568 | } | |
1569 | case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END: | |
1570 | { | |
1571 | uint64_t ts; | |
1572 | ||
dd5a0db3 | 1573 | ret = ops->timestamp_end(config, buf, &ts); |
3b731ab1 JD |
1574 | if (ret < 0) |
1575 | goto error; | |
1576 | return put_u64(ts, arg); | |
1577 | } | |
1578 | case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED: | |
1579 | { | |
1580 | uint64_t ed; | |
1581 | ||
dd5a0db3 | 1582 | ret = ops->events_discarded(config, buf, &ed); |
3b731ab1 JD |
1583 | if (ret < 0) |
1584 | goto error; | |
1585 | return put_u64(ed, arg); | |
ed8d02d6 | 1586 | } |
3b731ab1 JD |
1587 | case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE: |
1588 | { | |
1589 | uint64_t cs; | |
1590 | ||
dd5a0db3 | 1591 | ret = ops->content_size(config, buf, &cs); |
3b731ab1 JD |
1592 | if (ret < 0) |
1593 | goto error; | |
1594 | return put_u64(cs, arg); | |
1595 | } | |
1596 | case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE: | |
1597 | { | |
1598 | uint64_t ps; | |
1599 | ||
dd5a0db3 | 1600 | ret = ops->packet_size(config, buf, &ps); |
3b731ab1 JD |
1601 | if (ret < 0) |
1602 | goto error; | |
1603 | return put_u64(ps, arg); | |
1604 | } | |
1605 | case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID: | |
1606 | { | |
1607 | uint64_t si; | |
1608 | ||
dd5a0db3 | 1609 | ret = ops->stream_id(config, buf, &si); |
3b731ab1 JD |
1610 | if (ret < 0) |
1611 | goto error; | |
1612 | return put_u64(si, arg); | |
1613 | } | |
2348ca17 JD |
1614 | case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP: |
1615 | { | |
1616 | uint64_t ts; | |
1617 | ||
dd5a0db3 | 1618 | ret = ops->current_timestamp(config, buf, &ts); |
2348ca17 JD |
1619 | if (ret < 0) |
1620 | goto error; | |
1621 | return put_u64(ts, arg); | |
1622 | } | |
5b3cf4f9 JD |
1623 | case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM: |
1624 | { | |
1625 | uint64_t seq; | |
1626 | ||
1627 | ret = ops->sequence_number(config, buf, &seq); | |
1628 | if (ret < 0) | |
1629 | goto error; | |
1630 | return put_u64(seq, arg); | |
1631 | } | |
5594698f JD |
1632 | case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID: |
1633 | { | |
1634 | uint64_t id; | |
1635 | ||
1636 | ret = ops->instance_id(config, buf, &id); | |
1637 | if (ret < 0) | |
1638 | goto error; | |
1639 | return put_u64(id, arg); | |
1640 | } | |
3b731ab1 JD |
1641 | default: |
1642 | return lib_ring_buffer_file_operations.compat_ioctl(filp, | |
1643 | cmd, arg); | |
1644 | } | |
1645 | ||
1646 | error: | |
1647 | return -ENOSYS; | |
ed8d02d6 JD |
1648 | } |
1649 | #endif /* CONFIG_COMPAT */ | |
1650 | ||
1651 | static void lttng_stream_override_ring_buffer_fops(void) | |
1652 | { | |
1653 | lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE; | |
1654 | lttng_stream_ring_buffer_file_operations.open = | |
1655 | lib_ring_buffer_file_operations.open; | |
1656 | lttng_stream_ring_buffer_file_operations.release = | |
1657 | lib_ring_buffer_file_operations.release; | |
1658 | lttng_stream_ring_buffer_file_operations.poll = | |
1659 | lib_ring_buffer_file_operations.poll; | |
1660 | lttng_stream_ring_buffer_file_operations.splice_read = | |
1661 | lib_ring_buffer_file_operations.splice_read; | |
1662 | lttng_stream_ring_buffer_file_operations.mmap = | |
1663 | lib_ring_buffer_file_operations.mmap; | |
1664 | lttng_stream_ring_buffer_file_operations.unlocked_ioctl = | |
1665 | lttng_stream_ring_buffer_ioctl; | |
1666 | lttng_stream_ring_buffer_file_operations.llseek = | |
1667 | lib_ring_buffer_file_operations.llseek; | |
1668 | #ifdef CONFIG_COMPAT | |
1669 | lttng_stream_ring_buffer_file_operations.compat_ioctl = | |
1670 | lttng_stream_ring_buffer_compat_ioctl; | |
1671 | #endif | |
1672 | } | |
1673 | ||
80996790 | 1674 | int __init lttng_abi_init(void) |
baf20995 MD |
1675 | { |
1676 | int ret = 0; | |
1677 | ||
6d2a620c | 1678 | wrapper_vmalloc_sync_all(); |
2754583e | 1679 | lttng_clock_ref(); |
d29348f7 | 1680 | lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL, |
e6a17f26 MD |
1681 | <tng_fops, NULL); |
1682 | ||
255e52a4 | 1683 | if (!lttng_proc_dentry) { |
baf20995 MD |
1684 | printk(KERN_ERR "Error creating LTTng control file\n"); |
1685 | ret = -ENOMEM; | |
1686 | goto error; | |
1687 | } | |
ed8d02d6 | 1688 | lttng_stream_override_ring_buffer_fops(); |
2754583e | 1689 | return 0; |
ed8d02d6 | 1690 | |
baf20995 | 1691 | error: |
2754583e | 1692 | lttng_clock_unref(); |
baf20995 MD |
1693 | return ret; |
1694 | } | |
1695 | ||
e6e65fcd MD |
1696 | /* No __exit annotation because used by init error path too. */ |
1697 | void lttng_abi_exit(void) | |
baf20995 | 1698 | { |
2754583e | 1699 | lttng_clock_unref(); |
e6a17f26 MD |
1700 | if (lttng_proc_dentry) |
1701 | remove_proc_entry("lttng", NULL); | |
baf20995 | 1702 | } |