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Generalize `lttng_enabler_link_bytecode()` bytecode list
[lttng-modules.git] / src / lttng-abi.c
CommitLineData
b7cdc182 1/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed 2 *
e8951e63 3 * lttng-abi.c
baf20995 4 *
e8951e63 5 * LTTng ABI
baf20995 6 *
886d51a3
MD		 7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
baf20995
MD		 9 * Mimic system calls for:
10 * - session creation, returns a file descriptor or failure.
ad1c05e1
MD		 11 * - channel creation, returns a file descriptor or failure.
12 * - Operates on a session file descriptor
13 * - Takes all channel options as parameters.
14 * - stream get, returns a file descriptor or failure.
15 * - Operates on a channel file descriptor.
16 * - stream notifier get, returns a file descriptor or failure.
17 * - Operates on a channel file descriptor.
18 * - event creation, returns a file descriptor or failure.
19 * - Operates on a channel file descriptor
20 * - Takes an event name as parameter
21 * - Takes an instrumentation source as parameter
22 * - e.g. tracepoints, dynamic_probes...
23 * - Takes instrumentation source specific arguments.
baf20995
MD		 24 */
25
11b5a3c2 26#include <linux/module.h>
e6a17f26 27#include <linux/proc_fs.h>
11b5a3c2
MD		 28#include <linux/anon_inodes.h>
29#include <linux/file.h>
30#include <linux/uaccess.h>
31#include <linux/slab.h>
abc0446a 32#include <linux/err.h>
263b6c88 33#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
24591303
MD		 34#include <ringbuffer/vfs.h>
35#include <ringbuffer/backend.h>
36#include <ringbuffer/frontend.h>
241ae9a8
MD		 37#include <wrapper/poll.h>
38#include <wrapper/file.h>
39#include <wrapper/kref.h>
2df37e95
MD		 40#include <lttng/string-utils.h>
41#include <lttng/abi.h>
42#include <lttng/abi-old.h>
43#include <lttng/events.h>
44#include <lttng/tracer.h>
45#include <lttng/tp-mempool.h>
24591303 46#include <ringbuffer/frontend_types.h>
db2511b4 47#include <ringbuffer/iterator.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 54static struct proc_dir_entry *lttng_proc_dentry;
059de147
MJ		 55
56#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
57static const struct proc_ops lttng_proc_ops;
58#else
59static const struct file_operations lttng_proc_ops;
60#endif
61
ad1c05e1 62static const struct file_operations lttng_session_fops;
750b05f2 63static const struct file_operations lttng_event_notifier_group_fops;
ad1c05e1 64static const struct file_operations lttng_channel_fops;
5dbbdb43 65static const struct file_operations lttng_metadata_fops;
305d3e42 66static const struct file_operations lttng_event_fops;
ed8d02d6 67static struct file_operations lttng_stream_ring_buffer_file_operations;
baf20995 68
9616f0bf 69static int put_u64(uint64_t val, unsigned long arg);
8b97fd42 70static int put_u32(uint32_t val, unsigned long arg);
9616f0bf 71
a33c9927
MD		 72/*
73 * Teardown management: opened file descriptors keep a refcount on the module,
74 * so it can only exit when all file descriptors are closed.
75 */
76
ad1c05e1 77static
baf20995
MD		 78int lttng_abi_create_session(void)
79{
a90917c3 80 struct lttng_session *session;
c0e31d2e 81 struct file *session_file;
11b5a3c2 82 int session_fd, ret;
baf20995 83
a90917c3 84 session = lttng_session_create();
baf20995
MD		 85 if (!session)
86 return -ENOMEM;
4ac10b76 87 session_fd = lttng_get_unused_fd();
baf20995
MD		 88 if (session_fd < 0) {
89 ret = session_fd;
90 goto fd_error;
91 }
c0e31d2e 92 session_file = anon_inode_getfile("[lttng_session]",
ad1c05e1 93 &lttng_session_fops,
baf20995 94 session, O_RDWR);
c0e31d2e
MD		 95 if (IS_ERR(session_file)) {
96 ret = PTR_ERR(session_file);
baf20995
MD		 97 goto file_error;
98 }
c0e31d2e
MD		 99 session->file = session_file;
100 fd_install(session_fd, session_file);
baf20995
MD		 101 return session_fd;
102
103file_error:
104 put_unused_fd(session_fd);
105fd_error:
a90917c3 106 lttng_session_destroy(session);
baf20995
MD		 107 return ret;
108}
109
21f58fb7
FD		 110void event_notifier_send_notification_work_wakeup(struct irq_work *entry)
111{
112 struct lttng_event_notifier_group *event_notifier_group =
113 container_of(entry, struct lttng_event_notifier_group,
114 wakeup_pending);
115 wake_up_interruptible(&event_notifier_group->read_wait);
116}
117
750b05f2
FD		 118static
119int lttng_abi_create_event_notifier_group(void)
120{
121 struct lttng_event_notifier_group *event_notifier_group;
122 struct file *event_notifier_group_file;
123 int event_notifier_group_fd, ret;
124
125 event_notifier_group = lttng_event_notifier_group_create();
126 if (!event_notifier_group)
127 return -ENOMEM;
128
129 event_notifier_group_fd = lttng_get_unused_fd();
130 if (event_notifier_group_fd < 0) {
131 ret = event_notifier_group_fd;
132 goto fd_error;
133 }
134 event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
135 &lttng_event_notifier_group_fops,
136 event_notifier_group, O_RDWR);
137 if (IS_ERR(event_notifier_group_file)) {
138 ret = PTR_ERR(event_notifier_group_file);
139 goto file_error;
140 }
141
142 event_notifier_group->file = event_notifier_group_file;
21f58fb7
FD		 143 init_waitqueue_head(&event_notifier_group->read_wait);
144 init_irq_work(&event_notifier_group->wakeup_pending,
145 event_notifier_send_notification_work_wakeup);
750b05f2
FD		 146 fd_install(event_notifier_group_fd, event_notifier_group_file);
147 return event_notifier_group_fd;
148
149file_error:
150 put_unused_fd(event_notifier_group_fd);
151fd_error:
152 lttng_event_notifier_group_destroy(event_notifier_group);
153 return ret;
154}
155
271b6681
MD		 156static
157int lttng_abi_tracepoint_list(void)
158{
159 struct file *tracepoint_list_file;
160 int file_fd, ret;
161
4ac10b76 162 file_fd = lttng_get_unused_fd();
271b6681
MD		 163 if (file_fd < 0) {
164 ret = file_fd;
165 goto fd_error;
166 }
30f18bf0 167
8ee099b6 168 tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
271b6681
MD		 169 &lttng_tracepoint_list_fops,
170 NULL, O_RDWR);
171 if (IS_ERR(tracepoint_list_file)) {
172 ret = PTR_ERR(tracepoint_list_file);
173 goto file_error;
174 }
30f18bf0
MD		 175 ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file);
176 if (ret < 0)
177 goto open_error;
271b6681
MD		 178 fd_install(file_fd, tracepoint_list_file);
179 return file_fd;
180
30f18bf0
MD		 181open_error:
182 fput(tracepoint_list_file);
271b6681
MD		 183file_error:
184 put_unused_fd(file_fd);
185fd_error:
186 return ret;
187}
188
f127e61e
MD		 189#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
190static inline
191int lttng_abi_syscall_list(void)
192{
193 return -ENOSYS;
194}
195#else
196static
197int lttng_abi_syscall_list(void)
198{
199 struct file *syscall_list_file;
200 int file_fd, ret;
201
202 file_fd = lttng_get_unused_fd();
203 if (file_fd < 0) {
204 ret = file_fd;
205 goto fd_error;
206 }
207
208 syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
209 &lttng_syscall_list_fops,
210 NULL, O_RDWR);
211 if (IS_ERR(syscall_list_file)) {
212 ret = PTR_ERR(syscall_list_file);
213 goto file_error;
214 }
215 ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
216 if (ret < 0)
217 goto open_error;
218 fd_install(file_fd, syscall_list_file);
f127e61e
MD		 219 return file_fd;
220
221open_error:
222 fput(syscall_list_file);
223file_error:
224 put_unused_fd(file_fd);
225fd_error:
226 return ret;
227}
228#endif
229
80c16bcf 230static
6dccd6c1 231void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
80c16bcf 232{
6dccd6c1
JD		 233 v->major = LTTNG_MODULES_MAJOR_VERSION;
234 v->minor = LTTNG_MODULES_MINOR_VERSION;
235 v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
80c16bcf
MD		 236}
237
42cabb80
MD		 238static
239void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
240{
241 v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
242 v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
243}
244
8070f5c0
MD		 245static
246long lttng_abi_add_context(struct file *file,
6dccd6c1 247 struct lttng_kernel_context *context_param,
a90917c3 248 struct lttng_ctx **ctx, struct lttng_session *session)
8070f5c0 249{
8070f5c0
MD		 250
251 if (session->been_active)
252 return -EPERM;
253
6dccd6c1 254 switch (context_param->ctx) {
12a313a5 255 case LTTNG_KERNEL_CONTEXT_PID:
8070f5c0 256 return lttng_add_pid_to_ctx(ctx);
a8ad3613
MD		 257 case LTTNG_KERNEL_CONTEXT_PRIO:
258 return lttng_add_prio_to_ctx(ctx);
53f1f0ca
MD		 259 case LTTNG_KERNEL_CONTEXT_NICE:
260 return lttng_add_nice_to_ctx(ctx);
b64bc438
MD		 261 case LTTNG_KERNEL_CONTEXT_VPID:
262 return lttng_add_vpid_to_ctx(ctx);
263 case LTTNG_KERNEL_CONTEXT_TID:
264 return lttng_add_tid_to_ctx(ctx);
265 case LTTNG_KERNEL_CONTEXT_VTID:
266 return lttng_add_vtid_to_ctx(ctx);
267 case LTTNG_KERNEL_CONTEXT_PPID:
268 return lttng_add_ppid_to_ctx(ctx);
269 case LTTNG_KERNEL_CONTEXT_VPPID:
270 return lttng_add_vppid_to_ctx(ctx);
12a313a5 271 case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
6dccd6c1
JD		 272 context_param->u.perf_counter.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
273 return lttng_add_perf_counter_to_ctx(context_param->u.perf_counter.type,
274 context_param->u.perf_counter.config,
275 context_param->u.perf_counter.name,
c24a0d71 276 ctx);
a2563e83
MD		 277 case LTTNG_KERNEL_CONTEXT_PROCNAME:
278 return lttng_add_procname_to_ctx(ctx);
975da2c0
JD		 279 case LTTNG_KERNEL_CONTEXT_HOSTNAME:
280 return lttng_add_hostname_to_ctx(ctx);
b3699d90
MD		 281 case LTTNG_KERNEL_CONTEXT_CPU_ID:
282 return lttng_add_cpu_id_to_ctx(ctx);
79150a49
JD		 283 case LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE:
284 return lttng_add_interruptible_to_ctx(ctx);
285 case LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE:
286 return lttng_add_need_reschedule_to_ctx(ctx);
287 case LTTNG_KERNEL_CONTEXT_PREEMPTIBLE:
288 return lttng_add_preemptible_to_ctx(ctx);
289 case LTTNG_KERNEL_CONTEXT_MIGRATABLE:
290 return lttng_add_migratable_to_ctx(ctx);
2fa2d39a
FG		 291 case LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL:
292 case LTTNG_KERNEL_CONTEXT_CALLSTACK_USER:
293 return lttng_add_callstack_to_ctx(ctx, context_param->ctx);
a6cf40a4
MJ		 294 case LTTNG_KERNEL_CONTEXT_CGROUP_NS:
295 return lttng_add_cgroup_ns_to_ctx(ctx);
296 case LTTNG_KERNEL_CONTEXT_IPC_NS:
297 return lttng_add_ipc_ns_to_ctx(ctx);
298 case LTTNG_KERNEL_CONTEXT_MNT_NS:
299 return lttng_add_mnt_ns_to_ctx(ctx);
300 case LTTNG_KERNEL_CONTEXT_NET_NS:
301 return lttng_add_net_ns_to_ctx(ctx);
302 case LTTNG_KERNEL_CONTEXT_PID_NS:
303 return lttng_add_pid_ns_to_ctx(ctx);
304 case LTTNG_KERNEL_CONTEXT_USER_NS:
305 return lttng_add_user_ns_to_ctx(ctx);
306 case LTTNG_KERNEL_CONTEXT_UTS_NS:
307 return lttng_add_uts_ns_to_ctx(ctx);
dc923e75
MJ		 308 case LTTNG_KERNEL_CONTEXT_UID:
309 return lttng_add_uid_to_ctx(ctx);
310 case LTTNG_KERNEL_CONTEXT_EUID:
311 return lttng_add_euid_to_ctx(ctx);
312 case LTTNG_KERNEL_CONTEXT_SUID:
313 return lttng_add_suid_to_ctx(ctx);
314 case LTTNG_KERNEL_CONTEXT_GID:
315 return lttng_add_gid_to_ctx(ctx);
316 case LTTNG_KERNEL_CONTEXT_EGID:
317 return lttng_add_egid_to_ctx(ctx);
318 case LTTNG_KERNEL_CONTEXT_SGID:
319 return lttng_add_sgid_to_ctx(ctx);
320 case LTTNG_KERNEL_CONTEXT_VUID:
321 return lttng_add_vuid_to_ctx(ctx);
322 case LTTNG_KERNEL_CONTEXT_VEUID:
323 return lttng_add_veuid_to_ctx(ctx);
324 case LTTNG_KERNEL_CONTEXT_VSUID:
325 return lttng_add_vsuid_to_ctx(ctx);
326 case LTTNG_KERNEL_CONTEXT_VGID:
327 return lttng_add_vgid_to_ctx(ctx);
328 case LTTNG_KERNEL_CONTEXT_VEGID:
329 return lttng_add_vegid_to_ctx(ctx);
330 case LTTNG_KERNEL_CONTEXT_VSGID:
331 return lttng_add_vsgid_to_ctx(ctx);
876e2e92
MJ		 332 case LTTNG_KERNEL_CONTEXT_TIME_NS:
333 return lttng_add_time_ns_to_ctx(ctx);
8070f5c0
MD		 334 default:
335 return -EINVAL;
336 }
337}
338
ad1c05e1
MD		 339/**
340 * lttng_ioctl - lttng syscall through ioctl
341 *
c0e31d2e 342 * @file: the file
ad1c05e1
MD		 343 * @cmd: the command
344 * @arg: command arg
345 *
346 * This ioctl implements lttng commands:
38d024ae 347 * LTTNG_KERNEL_SESSION
ad1c05e1 348 * Returns a LTTng trace session file descriptor
271b6681
MD		 349 * LTTNG_KERNEL_TRACER_VERSION
350 * Returns the LTTng kernel tracer version
351 * LTTNG_KERNEL_TRACEPOINT_LIST
352 * Returns a file descriptor listing available tracepoints
360f38ea
MD		 353 * LTTNG_KERNEL_WAIT_QUIESCENT
354 * Returns after all previously running probes have completed
42cabb80
MD		 355 * LTTNG_KERNEL_TRACER_ABI_VERSION
356 * Returns the LTTng kernel tracer ABI version
750b05f2
FD		 357 * LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE
358 * Returns a LTTng event notifier group file descriptor
ad1c05e1
MD		 359 *
360 * The returned session will be deleted when its file descriptor is closed.
361 */
362static
c0e31d2e 363long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1
MD		 364{
365 switch (cmd) {
6dccd6c1 366 case LTTNG_KERNEL_OLD_SESSION:
38d024ae 367 case LTTNG_KERNEL_SESSION:
ad1c05e1 368 return lttng_abi_create_session();
750b05f2
FD		 369 case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE:
370 return lttng_abi_create_event_notifier_group();
6dccd6c1
JD		 371 case LTTNG_KERNEL_OLD_TRACER_VERSION:
372 {
373 struct lttng_kernel_tracer_version v;
374 struct lttng_kernel_old_tracer_version oldv;
375 struct lttng_kernel_old_tracer_version *uversion =
376 (struct lttng_kernel_old_tracer_version __user *) arg;
377
378 lttng_abi_tracer_version(&v);
379 oldv.major = v.major;
380 oldv.minor = v.minor;
381 oldv.patchlevel = v.patchlevel;
382
383 if (copy_to_user(uversion, &oldv, sizeof(oldv)))
384 return -EFAULT;
385 return 0;
386 }
80c16bcf 387 case LTTNG_KERNEL_TRACER_VERSION:
6dccd6c1
JD		 388 {
389 struct lttng_kernel_tracer_version version;
390 struct lttng_kernel_tracer_version *uversion =
391 (struct lttng_kernel_tracer_version __user *) arg;
392
393 lttng_abi_tracer_version(&version);
42cabb80
MD		 394
395 if (copy_to_user(uversion, &version, sizeof(version)))
396 return -EFAULT;
397 return 0;
398 }
399 case LTTNG_KERNEL_TRACER_ABI_VERSION:
400 {
401 struct lttng_kernel_tracer_abi_version version;
402 struct lttng_kernel_tracer_abi_version *uversion =
403 (struct lttng_kernel_tracer_abi_version __user *) arg;
404
405 lttng_abi_tracer_abi_version(&version);
406
6dccd6c1
JD		 407 if (copy_to_user(uversion, &version, sizeof(version)))
408 return -EFAULT;
409 return 0;
410 }
411 case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
271b6681
MD		 412 case LTTNG_KERNEL_TRACEPOINT_LIST:
413 return lttng_abi_tracepoint_list();
2d2464bd
MD		 414 case LTTNG_KERNEL_SYSCALL_LIST:
415 return lttng_abi_syscall_list();
6dccd6c1 416 case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
5f7f9078
MD		 417 case LTTNG_KERNEL_WAIT_QUIESCENT:
418 synchronize_trace();
419 return 0;
6dccd6c1
JD		 420 case LTTNG_KERNEL_OLD_CALIBRATE:
421 {
422 struct lttng_kernel_old_calibrate __user *ucalibrate =
423 (struct lttng_kernel_old_calibrate __user *) arg;
424 struct lttng_kernel_old_calibrate old_calibrate;
425 struct lttng_kernel_calibrate calibrate;
426 int ret;
427
428 if (copy_from_user(&old_calibrate, ucalibrate, sizeof(old_calibrate)))
429 return -EFAULT;
430 calibrate.type = old_calibrate.type;
431 ret = lttng_calibrate(&calibrate);
432 if (copy_to_user(ucalibrate, &old_calibrate, sizeof(old_calibrate)))
433 return -EFAULT;
434 return ret;
435 }
57105fc2
MD		 436 case LTTNG_KERNEL_CALIBRATE:
437 {
3db41b2c
MD		 438 struct lttng_kernel_calibrate __user *ucalibrate =
439 (struct lttng_kernel_calibrate __user *) arg;
440 struct lttng_kernel_calibrate calibrate;
57105fc2
MD		 441 int ret;
442
443 if (copy_from_user(&calibrate, ucalibrate, sizeof(calibrate)))
444 return -EFAULT;
445 ret = lttng_calibrate(&calibrate);
446 if (copy_to_user(ucalibrate, &calibrate, sizeof(calibrate)))
447 return -EFAULT;
448 return ret;
449 }
ad1c05e1
MD		 450 default:
451 return -ENOIOCTLCMD;
452 }
453}
454
059de147
MJ		 455#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
456static const struct proc_ops lttng_proc_ops = {
457 .proc_ioctl = lttng_ioctl,
458#ifdef CONFIG_COMPAT
459 .proc_compat_ioctl = lttng_ioctl,
460#endif /* CONFIG_COMPAT */
461};
462#else
463static const struct file_operations lttng_proc_ops = {
a33c9927 464 .owner = THIS_MODULE,
ad1c05e1
MD		 465 .unlocked_ioctl = lttng_ioctl,
466#ifdef CONFIG_COMPAT
03037b98 467 .compat_ioctl = lttng_ioctl,
059de147 468#endif /* CONFIG_COMPAT */
11b5a3c2 469};
059de147 470#endif
ad1c05e1 471
5dbbdb43 472static
c0e31d2e 473int lttng_abi_create_channel(struct file *session_file,
6dccd6c1 474 struct lttng_kernel_channel *chan_param,
5dbbdb43 475 enum channel_type channel_type)
baf20995 476{
a90917c3 477 struct lttng_session *session = session_file->private_data;
88dfd899 478 const struct file_operations *fops = NULL;
5dbbdb43 479 const char *transport_name;
a90917c3 480 struct lttng_channel *chan;
c0e31d2e 481 struct file *chan_file;
baf20995 482 int chan_fd;
ad1c05e1 483 int ret = 0;
baf20995 484
4ac10b76 485 chan_fd = lttng_get_unused_fd();
baf20995
MD		 486 if (chan_fd < 0) {
487 ret = chan_fd;
488 goto fd_error;
489 }
88dfd899
MD		 490 switch (channel_type) {
491 case PER_CPU_CHANNEL:
492 fops = &lttng_channel_fops;
493 break;
494 case METADATA_CHANNEL:
495 fops = &lttng_metadata_fops;
496 break;
497 }
2470a237 498
c0e31d2e 499 chan_file = anon_inode_getfile("[lttng_channel]",
88dfd899 500 fops,
03037b98 501 NULL, O_RDWR);
c0e31d2e
MD		 502 if (IS_ERR(chan_file)) {
503 ret = PTR_ERR(chan_file);
baf20995
MD		 504 goto file_error;
505 }
5dbbdb43
MD		 506 switch (channel_type) {
507 case PER_CPU_CHANNEL:
6dccd6c1
JD		 508 if (chan_param->output == LTTNG_KERNEL_SPLICE) {
509 transport_name = chan_param->overwrite ?
96ba7208 510 "relay-overwrite" : "relay-discard";
6dccd6c1
JD		 511 } else if (chan_param->output == LTTNG_KERNEL_MMAP) {
512 transport_name = chan_param->overwrite ?
96ba7208
JD		 513 "relay-overwrite-mmap" : "relay-discard-mmap";
514 } else {
515 return -EINVAL;
516 }
5dbbdb43 517 break;
5dbbdb43 518 case METADATA_CHANNEL:
6dccd6c1 519 if (chan_param->output == LTTNG_KERNEL_SPLICE)
96ba7208 520 transport_name = "relay-metadata";
6dccd6c1 521 else if (chan_param->output == LTTNG_KERNEL_MMAP)
96ba7208
JD		 522 transport_name = "relay-metadata-mmap";
523 else
524 return -EINVAL;
5dbbdb43
MD		 525 break;
526 default:
527 transport_name = "<unknown>";
528 break;
529 }
98d7281c
MJ		 530 if (!atomic_long_add_unless(&session_file->f_count, 1, LONG_MAX)) {
531 ret = -EOVERFLOW;
9c1f4643
MD		 532 goto refcount_error;
533 }
03037b98
MD		 534 /*
535 * We tolerate no failure path after channel creation. It will stay
536 * invariant for the rest of the session.
537 */
a90917c3 538 chan = lttng_channel_create(session, transport_name, NULL,
6dccd6c1
JD		 539 chan_param->subbuf_size,
540 chan_param->num_subbuf,
541 chan_param->switch_timer_interval,
d83004aa
JD		 542 chan_param->read_timer_interval,
543 channel_type);
03037b98 544 if (!chan) {
f3d01b96 545 ret = -EINVAL;
03037b98
MD		 546 goto chan_error;
547 }
11b5a3c2 548 chan->file = chan_file;
c0e31d2e
MD		 549 chan_file->private_data = chan;
550 fd_install(chan_fd, chan_file);
ad1c05e1 551
baf20995
MD		 552 return chan_fd;
553
03037b98 554chan_error:
9c1f4643
MD		 555 atomic_long_dec(&session_file->f_count);
556refcount_error:
c0e31d2e 557 fput(chan_file);
baf20995
MD		 558file_error:
559 put_unused_fd(chan_fd);
560fd_error:
baf20995
MD		 561 return ret;
562}
563
7f859fbf
JR		 564static
565int lttng_abi_session_set_name(struct lttng_session *session,
566 struct lttng_kernel_session_name *name)
567{
568 size_t len;
569
570 len = strnlen(name->name, LTTNG_KERNEL_SESSION_NAME_LEN);
571
572 if (len == LTTNG_KERNEL_SESSION_NAME_LEN) {
573 /* Name is too long/malformed */
574 return -EINVAL;
575 }
576
577 strcpy(session->name, name->name);
578 return 0;
579}
580
1c88f269
JR		 581static
582int lttng_abi_session_set_creation_time(struct lttng_session *session,
583 struct lttng_kernel_session_creation_time *time)
584{
585 size_t len;
586
587 len = strnlen(time->iso8601, LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN);
588
589 if (len == LTTNG_KERNEL_SESSION_CREATION_TIME_ISO8601_LEN) {
590 /* Time is too long/malformed */
591 return -EINVAL;
592 }
593
594 strcpy(session->creation_time, time->iso8601);
595 return 0;
596}
597
d1f652f8
MD		 598static
599enum tracker_type get_tracker_type(struct lttng_kernel_tracker_args *tracker)
600{
601 switch (tracker->type) {
602 case LTTNG_KERNEL_TRACKER_PID:
603 return TRACKER_PID;
604 case LTTNG_KERNEL_TRACKER_VPID:
605 return TRACKER_VPID;
606 case LTTNG_KERNEL_TRACKER_UID:
607 return TRACKER_UID;
608 case LTTNG_KERNEL_TRACKER_VUID:
609 return TRACKER_VUID;
610 case LTTNG_KERNEL_TRACKER_GID:
611 return TRACKER_GID;
612 case LTTNG_KERNEL_TRACKER_VGID:
613 return TRACKER_VGID;
614 default:
615 return TRACKER_UNKNOWN;
616 }
617}
618
baf20995 619/**
ad1c05e1 620 * lttng_session_ioctl - lttng session fd ioctl
baf20995 621 *
c0e31d2e 622 * @file: the file
baf20995
MD		 623 * @cmd: the command
624 * @arg: command arg
625 *
626 * This ioctl implements lttng commands:
38d024ae 627 * LTTNG_KERNEL_CHANNEL
baf20995 628 * Returns a LTTng channel file descriptor
e64957da
MD		 629 * LTTNG_KERNEL_ENABLE
630 * Enables tracing for a session (weak enable)
631 * LTTNG_KERNEL_DISABLE
632 * Disables tracing for a session (strong disable)
8070f5c0
MD		 633 * LTTNG_KERNEL_METADATA
634 * Returns a LTTng metadata file descriptor
e0130fab 635 * LTTNG_KERNEL_SESSION_TRACK_PID
d1f652f8 636 * Add PID to session PID tracker
e0130fab 637 * LTTNG_KERNEL_SESSION_UNTRACK_PID
d1f652f8
MD		 638 * Remove PID from session PID tracker
639 * LTTNG_KERNEL_SESSION_TRACK_ID
640 * Add ID to tracker
641 * LTTNG_KERNEL_SESSION_UNTRACK_ID
642 * Remove ID from tracker
ad1c05e1
MD		 643 *
644 * The returned channel will be deleted when its file descriptor is closed.
645 */
646static
c0e31d2e 647long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ad1c05e1 648{
a90917c3 649 struct lttng_session *session = file->private_data;
2d4c4d15
MD		 650 struct lttng_kernel_channel chan_param;
651 struct lttng_kernel_old_channel old_chan_param;
c0e31d2e 652
ad1c05e1 653 switch (cmd) {
6dccd6c1
JD		 654 case LTTNG_KERNEL_OLD_CHANNEL:
655 {
6dccd6c1
JD		 656 if (copy_from_user(&old_chan_param,
657 (struct lttng_kernel_old_channel __user *) arg,
658 sizeof(struct lttng_kernel_old_channel)))
659 return -EFAULT;
660 chan_param.overwrite = old_chan_param.overwrite;
661 chan_param.subbuf_size = old_chan_param.subbuf_size;
662 chan_param.num_subbuf = old_chan_param.num_subbuf;
663 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
664 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
665 chan_param.output = old_chan_param.output;
666
667 return lttng_abi_create_channel(file, &chan_param,
668 PER_CPU_CHANNEL);
669 }
38d024ae 670 case LTTNG_KERNEL_CHANNEL:
6dccd6c1 671 {
6dccd6c1 672 if (copy_from_user(&chan_param,
38d024ae 673 (struct lttng_kernel_channel __user *) arg,
6dccd6c1
JD		 674 sizeof(struct lttng_kernel_channel)))
675 return -EFAULT;
676 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 677 PER_CPU_CHANNEL);
6dccd6c1
JD		 678 }
679 case LTTNG_KERNEL_OLD_SESSION_START:
680 case LTTNG_KERNEL_OLD_ENABLE:
38d024ae 681 case LTTNG_KERNEL_SESSION_START:
e64957da 682 case LTTNG_KERNEL_ENABLE:
a90917c3 683 return lttng_session_enable(session);
6dccd6c1
JD		 684 case LTTNG_KERNEL_OLD_SESSION_STOP:
685 case LTTNG_KERNEL_OLD_DISABLE:
38d024ae 686 case LTTNG_KERNEL_SESSION_STOP:
e64957da 687 case LTTNG_KERNEL_DISABLE:
a90917c3 688 return lttng_session_disable(session);
6dccd6c1
JD		 689 case LTTNG_KERNEL_OLD_METADATA:
690 {
6dccd6c1
JD		 691 if (copy_from_user(&old_chan_param,
692 (struct lttng_kernel_old_channel __user *) arg,
693 sizeof(struct lttng_kernel_old_channel)))
694 return -EFAULT;
695 chan_param.overwrite = old_chan_param.overwrite;
696 chan_param.subbuf_size = old_chan_param.subbuf_size;
697 chan_param.num_subbuf = old_chan_param.num_subbuf;
698 chan_param.switch_timer_interval = old_chan_param.switch_timer_interval;
699 chan_param.read_timer_interval = old_chan_param.read_timer_interval;
700 chan_param.output = old_chan_param.output;
701
702 return lttng_abi_create_channel(file, &chan_param,
703 METADATA_CHANNEL);
704 }
38d024ae 705 case LTTNG_KERNEL_METADATA:
6dccd6c1 706 {
6dccd6c1
JD		 707 if (copy_from_user(&chan_param,
708 (struct lttng_kernel_channel __user *) arg,
709 sizeof(struct lttng_kernel_channel)))
710 return -EFAULT;
711 return lttng_abi_create_channel(file, &chan_param,
5dbbdb43 712 METADATA_CHANNEL);
6dccd6c1 713 }
e0130fab 714 case LTTNG_KERNEL_SESSION_TRACK_PID:
d1f652f8 715 return lttng_session_track_id(session, TRACKER_PID, (int) arg);
e0130fab 716 case LTTNG_KERNEL_SESSION_UNTRACK_PID:
d1f652f8
MD		 717 return lttng_session_untrack_id(session, TRACKER_PID, (int) arg);
718 case LTTNG_KERNEL_SESSION_TRACK_ID:
719 {
720 struct lttng_kernel_tracker_args tracker;
721 enum tracker_type tracker_type;
722
723 if (copy_from_user(&tracker,
724 (struct lttng_kernel_tracker_args __user *) arg,
725 sizeof(struct lttng_kernel_tracker_args)))
726 return -EFAULT;
727 tracker_type = get_tracker_type(&tracker);
728 if (tracker_type == TRACKER_UNKNOWN)
729 return -EINVAL;
730 return lttng_session_track_id(session, tracker_type, tracker.id);
731 }
732 case LTTNG_KERNEL_SESSION_UNTRACK_ID:
733 {
734 struct lttng_kernel_tracker_args tracker;
735 enum tracker_type tracker_type;
736
737 if (copy_from_user(&tracker,
738 (struct lttng_kernel_tracker_args __user *) arg,
739 sizeof(struct lttng_kernel_tracker_args)))
740 return -EFAULT;
741 tracker_type = get_tracker_type(&tracker);
742 if (tracker_type == TRACKER_UNKNOWN)
743 return -EINVAL;
744 return lttng_session_untrack_id(session, tracker_type,
745 tracker.id);
746 }
7e6f9ef6 747 case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
d1f652f8
MD		 748 return lttng_session_list_tracker_ids(session, TRACKER_PID);
749 case LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS:
750 {
751 struct lttng_kernel_tracker_args tracker;
752 enum tracker_type tracker_type;
753
754 if (copy_from_user(&tracker,
755 (struct lttng_kernel_tracker_args __user *) arg,
756 sizeof(struct lttng_kernel_tracker_args)))
757 return -EFAULT;
758 tracker_type = get_tracker_type(&tracker);
759 if (tracker_type == TRACKER_UNKNOWN)
760 return -EINVAL;
761 return lttng_session_list_tracker_ids(session, tracker_type);
762 }
9616f0bf
JD		 763 case LTTNG_KERNEL_SESSION_METADATA_REGEN:
764 return lttng_session_metadata_regenerate(session);
601252cf
MD		 765 case LTTNG_KERNEL_SESSION_STATEDUMP:
766 return lttng_session_statedump(session);
7f859fbf
JR		 767 case LTTNG_KERNEL_SESSION_SET_NAME:
768 {
769 struct lttng_kernel_session_name name;
770
771 if (copy_from_user(&name,
772 (struct lttng_kernel_session_name __user *) arg,
773 sizeof(struct lttng_kernel_session_name)))
774 return -EFAULT;
775 return lttng_abi_session_set_name(session, &name);
776 }
1c88f269
JR		 777 case LTTNG_KERNEL_SESSION_SET_CREATION_TIME:
778 {
779 struct lttng_kernel_session_creation_time time;
780
781 if (copy_from_user(&time,
782 (struct lttng_kernel_session_creation_time __user *) arg,
783 sizeof(struct lttng_kernel_session_creation_time)))
784 return -EFAULT;
785 return lttng_abi_session_set_creation_time(session, &time);
786 }
ad1c05e1
MD		 787 default:
788 return -ENOIOCTLCMD;
789 }
790}
791
03037b98
MD		 792/*
793 * Called when the last file reference is dropped.
794 *
795 * Big fat note: channels and events are invariant for the whole session after
796 * their creation. So this session destruction also destroys all channel and
797 * event structures specific to this session (they are not destroyed when their
798 * individual file is released).
799 */
ad1c05e1 800static
03037b98 801int lttng_session_release(struct inode *inode, struct file *file)
ad1c05e1 802{
a90917c3 803 struct lttng_session *session = file->private_data;
c269fff4
MD		 804
805 if (session)
a90917c3 806 lttng_session_destroy(session);
11b5a3c2 807 return 0;
ad1c05e1 808}
ad1c05e1
MD		 809
810static const struct file_operations lttng_session_fops = {
a33c9927 811 .owner = THIS_MODULE,
03037b98 812 .release = lttng_session_release,
ad1c05e1
MD		 813 .unlocked_ioctl = lttng_session_ioctl,
814#ifdef CONFIG_COMPAT
03037b98 815 .compat_ioctl = lttng_session_ioctl,
ad1c05e1 816#endif
11b5a3c2 817};
ad1c05e1 818
db2511b4
MD		 819/*
820 * When encountering empty buffer, flush current sub-buffer if non-empty
821 * and retry (if new data available to read after flush).
822 */
823static
824ssize_t lttng_event_notifier_group_notif_read(struct file *filp, char __user *user_buf,
825 size_t count, loff_t *ppos)
826{
827 struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
828 struct channel *chan = event_notifier_group->chan;
829 struct lib_ring_buffer *buf = event_notifier_group->buf;
830 ssize_t read_count = 0, len;
831 size_t read_offset;
832
833 might_sleep();
834 if (!lttng_access_ok(VERIFY_WRITE, user_buf, count))
835 return -EFAULT;
836
837 /* Finish copy of previous record */
838 if (*ppos != 0) {
839 if (read_count < count) {
840 len = chan->iter.len_left;
841 read_offset = *ppos;
842 goto skip_get_next;
843 }
844 }
845
846 while (read_count < count) {
847 size_t copy_len, space_left;
848
849 len = lib_ring_buffer_get_next_record(chan, buf);
850len_test:
851 if (len < 0) {
852 /*
853 * Check if buffer is finalized (end of file).
854 */
855 if (len == -ENODATA) {
856 /* A 0 read_count will tell about end of file */
857 goto nodata;
858 }
859 if (filp->f_flags & O_NONBLOCK) {
860 if (!read_count)
861 read_count = -EAGAIN;
862 goto nodata;
863 } else {
864 int error;
865
866 /*
867 * No data available at the moment, return what
868 * we got.
869 */
870 if (read_count)
871 goto nodata;
872
873 /*
874 * Wait for returned len to be >= 0 or -ENODATA.
875 */
876 error = wait_event_interruptible(
877 event_notifier_group->read_wait,
878 ((len = lib_ring_buffer_get_next_record(
879 chan, buf)), len != -EAGAIN));
880 CHAN_WARN_ON(chan, len == -EBUSY);
881 if (error) {
882 read_count = error;
883 goto nodata;
884 }
885 CHAN_WARN_ON(chan, len < 0 && len != -ENODATA);
886 goto len_test;
887 }
888 }
889 read_offset = buf->iter.read_offset;
890skip_get_next:
891 space_left = count - read_count;
892 if (len <= space_left) {
893 copy_len = len;
894 chan->iter.len_left = 0;
895 *ppos = 0;
896 } else {
897 copy_len = space_left;
898 chan->iter.len_left = len - copy_len;
899 *ppos = read_offset + copy_len;
900 }
901 if (__lib_ring_buffer_copy_to_user(&buf->backend, read_offset,
902 &user_buf[read_count],
903 copy_len)) {
904 /*
905 * Leave the len_left and ppos values at their current
906 * state, as we currently have a valid event to read.
907 */
908 return -EFAULT;
909 }
910 read_count += copy_len;
911 }
31c02fb7 912 goto put_record;
db2511b4
MD		 913
914nodata:
915 *ppos = 0;
916 chan->iter.len_left = 0;
31c02fb7
MD		 917
918put_record:
919 lib_ring_buffer_put_current_record(buf);
db2511b4
MD		 920 return read_count;
921}
922
923/*
924 * If the ring buffer is non empty (even just a partial subbuffer), return that
925 * there is data available. Perform a ring buffer flush if we encounter a
926 * non-empty ring buffer which does not have any consumeable subbuffer available.
927 */
928static
929unsigned int lttng_event_notifier_group_notif_poll(struct file *filp,
930 poll_table *wait)
931{
932 unsigned int mask = 0;
933 struct lttng_event_notifier_group *event_notifier_group = filp->private_data;
934 struct channel *chan = event_notifier_group->chan;
935 struct lib_ring_buffer *buf = event_notifier_group->buf;
936 const struct lib_ring_buffer_config *config = &chan->backend.config;
937 int finalized, disabled;
938 unsigned long consumed, offset;
18f12d55 939 size_t subbuffer_header_size = config->cb.subbuffer_header_size();
db2511b4
MD		 940
941 if (filp->f_mode & FMODE_READ) {
942 poll_wait_set_exclusive(wait);
943 poll_wait(filp, &event_notifier_group->read_wait, wait);
944
945 finalized = lib_ring_buffer_is_finalized(config, buf);
946 disabled = lib_ring_buffer_channel_is_disabled(chan);
947
948 /*
949 * lib_ring_buffer_is_finalized() contains a smp_rmb() ordering
950 * finalized load before offsets loads.
951 */
952 WARN_ON(atomic_long_read(&buf->active_readers) != 1);
953retry:
954 if (disabled)
955 return POLLERR;
956
957 offset = lib_ring_buffer_get_offset(config, buf);
958 consumed = lib_ring_buffer_get_consumed(config, buf);
959
960 /*
961 * If there is no buffer available to consume.
962 */
963 if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan) == 0) {
964 /*
965 * If there is a non-empty subbuffer, flush and try again.
966 */
18f12d55 967 if (subbuf_offset(offset, chan) > subbuffer_header_size) {
db2511b4
MD		 968 lib_ring_buffer_switch_remote(buf);
969 goto retry;
970 }
971
972 if (finalized)
973 return POLLHUP;
974 else {
975 /*
976 * The memory barriers
977 * __wait_event()/wake_up_interruptible() take
978 * care of "raw_spin_is_locked" memory ordering.
979 */
980 if (raw_spin_is_locked(&buf->raw_tick_nohz_spinlock))
981 goto retry;
982 else
983 return 0;
984 }
985 } else {
986 if (subbuf_trunc(offset, chan) - subbuf_trunc(consumed, chan)
987 >= chan->backend.buf_size)
988 return POLLPRI | POLLRDBAND;
989 else
990 return POLLIN | POLLRDNORM;
991 }
992 }
993
994 return mask;
995}
996
997/**
998 * lttng_event_notifier_group_notif_open - event_notifier ring buffer open file operation
999 * @inode: opened inode
1000 * @file: opened file
1001 *
1002 * Open implementation. Makes sure only one open instance of a buffer is
1003 * done at a given moment.
1004 */
1005static int lttng_event_notifier_group_notif_open(struct inode *inode, struct file *file)
1006{
1007 struct lttng_event_notifier_group *event_notifier_group = inode->i_private;
1008 struct lib_ring_buffer *buf = event_notifier_group->buf;
1009
1010 file->private_data = event_notifier_group;
1011 return lib_ring_buffer_open(inode, file, buf);
1012}
1013
1014/**
1015 * lttng_event_notifier_group_notif_release - event_notifier ring buffer release file operation
1016 * @inode: opened inode
1017 * @file: opened file
1018 *
1019 * Release implementation.
1020 */
1021static int lttng_event_notifier_group_notif_release(struct inode *inode, struct file *file)
1022{
1023 struct lttng_event_notifier_group *event_notifier_group = file->private_data;
1024 struct lib_ring_buffer *buf = event_notifier_group->buf;
1025 int ret;
1026
1027 ret = lib_ring_buffer_release(inode, file, buf);
1028 if (ret)
1029 return ret;
1030 fput(event_notifier_group->file);
1031 return 0;
1032}
1033
21f58fb7
FD		 1034static const struct file_operations lttng_event_notifier_group_notif_fops = {
1035 .owner = THIS_MODULE,
db2511b4
MD		 1036 .open = lttng_event_notifier_group_notif_open,
1037 .release = lttng_event_notifier_group_notif_release,
1038 .read = lttng_event_notifier_group_notif_read,
1039 .poll = lttng_event_notifier_group_notif_poll,
21f58fb7
FD		 1040};
1041
d83004aa
JD		 1042/**
1043 * lttng_metadata_ring_buffer_poll - LTTng ring buffer poll file operation
1044 * @filp: the file
1045 * @wait: poll table
1046 *
1047 * Handles the poll operations for the metadata channels.
1048 */
ad1c05e1 1049static
d83004aa
JD		 1050unsigned int lttng_metadata_ring_buffer_poll(struct file *filp,
1051 poll_table *wait)
1052{
1053 struct lttng_metadata_stream *stream = filp->private_data;
1054 struct lib_ring_buffer *buf = stream->priv;
1055 int finalized;
1056 unsigned int mask = 0;
1057
1058 if (filp->f_mode & FMODE_READ) {
1059 poll_wait_set_exclusive(wait);
1060 poll_wait(filp, &stream->read_wait, wait);
1061
1062 finalized = stream->finalized;
1063
1064 /*
1065 * lib_ring_buffer_is_finalized() contains a smp_rmb()
1066 * ordering finalized load before offsets loads.
1067 */
1068 WARN_ON(atomic_long_read(&buf->active_readers) != 1);
1069
1070 if (finalized)
1071 mask |= POLLHUP;
1072
92d9f5e6 1073 mutex_lock(&stream->metadata_cache->lock);
d83004aa 1074 if (stream->metadata_cache->metadata_written >
f613e3e6 1075 stream->metadata_out)
d83004aa 1076 mask |= POLLIN;
92d9f5e6 1077 mutex_unlock(&stream->metadata_cache->lock);
d83004aa
JD		 1078 }
1079
1080 return mask;
1081}
1082
f613e3e6
MD		 1083static
1084void lttng_metadata_ring_buffer_ioctl_put_next_subbuf(struct file *filp,
1085 unsigned int cmd, unsigned long arg)
1086{
1087 struct lttng_metadata_stream *stream = filp->private_data;
1088
1089 stream->metadata_out = stream->metadata_in;
1090}
1091
d1344afa
JD		 1092/*
1093 * Reset the counter of how much metadata has been consumed to 0. That way,
1094 * the consumer receives the content of the metadata cache unchanged. This is
1095 * different from the metadata_regenerate where the offset from epoch is
1096 * resampled, here we want the exact same content as the last time the metadata
1097 * was generated. This command is only possible if all the metadata written
1098 * in the cache has been output to the metadata stream to avoid corrupting the
1099 * metadata file.
1100 *
1101 * Return 0 on success, a negative value on error.
1102 */
1103static
1104int lttng_metadata_cache_dump(struct lttng_metadata_stream *stream)
1105{
1106 int ret;
1107 struct lttng_metadata_cache *cache = stream->metadata_cache;
1108
1109 mutex_lock(&cache->lock);
1110 if (stream->metadata_out != cache->metadata_written) {
1111 ret = -EBUSY;
1112 goto end;
1113 }
1114 stream->metadata_out = 0;
1115 stream->metadata_in = 0;
1116 wake_up_interruptible(&stream->read_wait);
1117 ret = 0;
1118
1119end:
1120 mutex_unlock(&cache->lock);
1121 return ret;
1122}
1123
d83004aa
JD		 1124static
1125long lttng_metadata_ring_buffer_ioctl(struct file *filp,
1126 unsigned int cmd, unsigned long arg)
1127{
1128 int ret;
1129 struct lttng_metadata_stream *stream = filp->private_data;
1130 struct lib_ring_buffer *buf = stream->priv;
8b97fd42
MD		 1131 unsigned int rb_cmd;
1132 bool coherent;
1133
1134 if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
1135 rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF;
1136 else
1137 rb_cmd = cmd;
d83004aa
JD		 1138
1139 switch (cmd) {
d83004aa
JD		 1140 case RING_BUFFER_GET_NEXT_SUBBUF:
1141 {
35097f36
JD		 1142 struct lttng_metadata_stream *stream = filp->private_data;
1143 struct lib_ring_buffer *buf = stream->priv;
1144 struct channel *chan = buf->backend.chan;
1145
8b97fd42 1146 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1147 if (ret > 0) {
1148 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1149 ret = 0;
1150 } else if (ret < 0)
d83004aa
JD		 1151 goto err;
1152 break;
1153 }
f613e3e6
MD		 1154 case RING_BUFFER_GET_SUBBUF:
1155 {
1156 /*
1157 * Random access is not allowed for metadata channel.
1158 */
1159 return -ENOSYS;
1160 }
c6f05468 1161 case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
35097f36
JD		 1162 case RING_BUFFER_FLUSH:
1163 {
1164 struct lttng_metadata_stream *stream = filp->private_data;
1165 struct lib_ring_buffer *buf = stream->priv;
1166 struct channel *chan = buf->backend.chan;
1167
1168 /*
1169 * Before doing the actual ring buffer flush, write up to one
1170 * packet of metadata in the ring buffer.
1171 */
8b97fd42 1172 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1173 if (ret < 0)
1174 goto err;
1175 break;
1176 }
9616f0bf
JD		 1177 case RING_BUFFER_GET_METADATA_VERSION:
1178 {
1179 struct lttng_metadata_stream *stream = filp->private_data;
1180
1181 return put_u64(stream->version, arg);
1182 }
d1344afa
JD		 1183 case RING_BUFFER_METADATA_CACHE_DUMP:
1184 {
1185 struct lttng_metadata_stream *stream = filp->private_data;
1186
1187 return lttng_metadata_cache_dump(stream);
1188 }
8b97fd42
MD		 1189 case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
1190 {
1191 struct lttng_metadata_stream *stream = filp->private_data;
1192 struct lib_ring_buffer *buf = stream->priv;
1193 struct channel *chan = buf->backend.chan;
1194
1195 ret = lttng_metadata_output_channel(stream, chan, &coherent);
1196 if (ret > 0) {
1197 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1198 ret = 0;
1199 } else if (ret < 0) {
1200 goto err;
1201 }
1202 break;
1203 }
d83004aa
JD		 1204 default:
1205 break;
1206 }
f613e3e6
MD		 1207 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1208
d83004aa 1209 /* Performing lib ring buffer ioctl after our own. */
8b97fd42 1210 ret = lib_ring_buffer_ioctl(filp, rb_cmd, arg, buf);
f613e3e6
MD		 1211 if (ret < 0)
1212 goto err;
d83004aa 1213
f613e3e6
MD		 1214 switch (cmd) {
1215 case RING_BUFFER_PUT_NEXT_SUBBUF:
1216 {
1217 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
1218 cmd, arg);
1219 break;
1220 }
8b97fd42
MD		 1221 case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
1222 {
1223 return put_u32(coherent, arg);
1224 }
f613e3e6
MD		 1225 default:
1226 break;
1227 }
d83004aa
JD		 1228err:
1229 return ret;
1230}
1231
aeb9064d 1232#ifdef CONFIG_COMPAT
d83004aa
JD		 1233static
1234long lttng_metadata_ring_buffer_compat_ioctl(struct file *filp,
1235 unsigned int cmd, unsigned long arg)
1236{
1237 int ret;
1238 struct lttng_metadata_stream *stream = filp->private_data;
1239 struct lib_ring_buffer *buf = stream->priv;
8b97fd42
MD		 1240 unsigned int rb_cmd;
1241 bool coherent;
1242
1243 if (cmd == RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK)
1244 rb_cmd = RING_BUFFER_GET_NEXT_SUBBUF;
1245 else
1246 rb_cmd = cmd;
d83004aa
JD		 1247
1248 switch (cmd) {
d83004aa
JD		 1249 case RING_BUFFER_GET_NEXT_SUBBUF:
1250 {
35097f36
JD		 1251 struct lttng_metadata_stream *stream = filp->private_data;
1252 struct lib_ring_buffer *buf = stream->priv;
1253 struct channel *chan = buf->backend.chan;
1254
8b97fd42 1255 ret = lttng_metadata_output_channel(stream, chan, NULL);
35097f36
JD		 1256 if (ret > 0) {
1257 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1258 ret = 0;
1259 } else if (ret < 0)
d83004aa
JD		 1260 goto err;
1261 break;
1262 }
f613e3e6
MD		 1263 case RING_BUFFER_GET_SUBBUF:
1264 {
1265 /*
1266 * Random access is not allowed for metadata channel.
1267 */
1268 return -ENOSYS;
1269 }
c6f05468 1270 case RING_BUFFER_FLUSH_EMPTY: /* Fall-through. */
96c55c2f
MD		 1271 case RING_BUFFER_FLUSH:
1272 {
1273 struct lttng_metadata_stream *stream = filp->private_data;
1274 struct lib_ring_buffer *buf = stream->priv;
1275 struct channel *chan = buf->backend.chan;
1276
1277 /*
1278 * Before doing the actual ring buffer flush, write up to one
1279 * packet of metadata in the ring buffer.
1280 */
8b97fd42 1281 ret = lttng_metadata_output_channel(stream, chan, NULL);
96c55c2f
MD		 1282 if (ret < 0)
1283 goto err;
1284 break;
1285 }
1286 case RING_BUFFER_GET_METADATA_VERSION:
1287 {
1288 struct lttng_metadata_stream *stream = filp->private_data;
1289
1290 return put_u64(stream->version, arg);
1291 }
d1344afa
JD		 1292 case RING_BUFFER_METADATA_CACHE_DUMP:
1293 {
1294 struct lttng_metadata_stream *stream = filp->private_data;
1295
1296 return lttng_metadata_cache_dump(stream);
1297 }
8b97fd42
MD		 1298 case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
1299 {
1300 struct lttng_metadata_stream *stream = filp->private_data;
1301 struct lib_ring_buffer *buf = stream->priv;
1302 struct channel *chan = buf->backend.chan;
1303
1304 ret = lttng_metadata_output_channel(stream, chan, &coherent);
1305 if (ret > 0) {
1306 lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
1307 ret = 0;
1308 } else if (ret < 0) {
1309 goto err;
1310 }
1311 break;
1312 }
d83004aa
JD		 1313 default:
1314 break;
1315 }
f613e3e6
MD		 1316 /* PUT_SUBBUF is the one from lib ring buffer, unmodified. */
1317
d83004aa 1318 /* Performing lib ring buffer ioctl after our own. */
8b97fd42 1319 ret = lib_ring_buffer_compat_ioctl(filp, rb_cmd, arg, buf);
f613e3e6
MD		 1320 if (ret < 0)
1321 goto err;
d83004aa 1322
f613e3e6
MD		 1323 switch (cmd) {
1324 case RING_BUFFER_PUT_NEXT_SUBBUF:
1325 {
1326 lttng_metadata_ring_buffer_ioctl_put_next_subbuf(filp,
1327 cmd, arg);
1328 break;
1329 }
8b97fd42
MD		 1330 case RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK:
1331 {
1332 return put_u32(coherent, arg);
1333 }
f613e3e6
MD		 1334 default:
1335 break;
1336 }
d83004aa
JD		 1337err:
1338 return ret;
1339}
aeb9064d 1340#endif
d83004aa 1341
b3b8072b
MD		 1342/*
1343 * This is not used by anonymous file descriptors. This code is left
1344 * there if we ever want to implement an inode with open() operation.
1345 */
d83004aa
JD		 1346static
1347int lttng_metadata_ring_buffer_open(struct inode *inode, struct file *file)
1348{
1349 struct lttng_metadata_stream *stream = inode->i_private;
1350 struct lib_ring_buffer *buf = stream->priv;
1351
1352 file->private_data = buf;
b3b8072b
MD		 1353 /*
1354 * Since life-time of metadata cache differs from that of
1355 * session, we need to keep our own reference on the transport.
1356 */
1357 if (!try_module_get(stream->transport->owner)) {
5a15f70c 1358 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
b3b8072b
MD		 1359 return -EBUSY;
1360 }
d83004aa
JD		 1361 return lib_ring_buffer_open(inode, file, buf);
1362}
1363
1364static
1365int lttng_metadata_ring_buffer_release(struct inode *inode, struct file *file)
1366{
1367 struct lttng_metadata_stream *stream = file->private_data;
1368 struct lib_ring_buffer *buf = stream->priv;
1369
92143b2c
MD		 1370 mutex_lock(&stream->metadata_cache->lock);
1371 list_del(&stream->list);
1372 mutex_unlock(&stream->metadata_cache->lock);
d83004aa 1373 kref_put(&stream->metadata_cache->refcount, metadata_cache_destroy);
b3b8072b 1374 module_put(stream->transport->owner);
92143b2c 1375 kfree(stream);
d83004aa
JD		 1376 return lib_ring_buffer_release(inode, file, buf);
1377}
1378
1379static
1380ssize_t lttng_metadata_ring_buffer_splice_read(struct file *in, loff_t *ppos,
1381 struct pipe_inode_info *pipe, size_t len,
1382 unsigned int flags)
1383{
1384 struct lttng_metadata_stream *stream = in->private_data;
1385 struct lib_ring_buffer *buf = stream->priv;
1386
1387 return lib_ring_buffer_splice_read(in, ppos, pipe, len,
1388 flags, buf);
1389}
1390
1391static
1392int lttng_metadata_ring_buffer_mmap(struct file *filp,
1393 struct vm_area_struct *vma)
1394{
1395 struct lttng_metadata_stream *stream = filp->private_data;
1396 struct lib_ring_buffer *buf = stream->priv;
1397
1398 return lib_ring_buffer_mmap(filp, vma, buf);
1399}
1400
1401static
1402const struct file_operations lttng_metadata_ring_buffer_file_operations = {
1403 .owner = THIS_MODULE,
1404 .open = lttng_metadata_ring_buffer_open,
1405 .release = lttng_metadata_ring_buffer_release,
1406 .poll = lttng_metadata_ring_buffer_poll,
1407 .splice_read = lttng_metadata_ring_buffer_splice_read,
1408 .mmap = lttng_metadata_ring_buffer_mmap,
1409 .unlocked_ioctl = lttng_metadata_ring_buffer_ioctl,
1410 .llseek = vfs_lib_ring_buffer_no_llseek,
1411#ifdef CONFIG_COMPAT
1412 .compat_ioctl = lttng_metadata_ring_buffer_compat_ioctl,
1413#endif
1414};
1415
1416static
1417int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
a3fcd499 1418 const struct file_operations *fops, const char *name)
ad1c05e1 1419{
ad1c05e1 1420 int stream_fd, ret;
11b5a3c2 1421 struct file *stream_file;
ad1c05e1 1422
4ac10b76 1423 stream_fd = lttng_get_unused_fd();
ad1c05e1
MD		 1424 if (stream_fd < 0) {
1425 ret = stream_fd;
1426 goto fd_error;
1427 }
a3fcd499 1428 stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR);
c0e31d2e
MD		 1429 if (IS_ERR(stream_file)) {
1430 ret = PTR_ERR(stream_file);
ad1c05e1
MD		 1431 goto file_error;
1432 }
409453cb
MD		 1433 /*
1434 * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor
1435 * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this
1436 * file descriptor, so we set FMODE_PREAD here.
1437 */
d7b6f197 1438 stream_file->f_mode |= FMODE_PREAD;
c0e31d2e 1439 fd_install(stream_fd, stream_file);
dda6a249
MD		 1440 /*
1441 * The stream holds a reference to the channel within the generic ring
1442 * buffer library, so no need to hold a refcount on the channel and
1443 * session files here.
1444 */
ad1c05e1
MD		 1445 return stream_fd;
1446
1447file_error:
1448 put_unused_fd(stream_fd);
d83004aa
JD		 1449fd_error:
1450 return ret;
1451}
1452
1453static
1454int lttng_abi_open_stream(struct file *channel_file)
1455{
1456 struct lttng_channel *channel = channel_file->private_data;
1457 struct lib_ring_buffer *buf;
1458 int ret;
1459 void *stream_priv;
1460
1461 buf = channel->ops->buffer_read_open(channel->chan);
1462 if (!buf)
1463 return -ENOENT;
1464
1465 stream_priv = buf;
1466 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
a3fcd499
MD		 1467 &lttng_stream_ring_buffer_file_operations,
1468 "[lttng_stream]");
d83004aa
JD		 1469 if (ret < 0)
1470 goto fd_error;
1471
1472 return ret;
1473
1474fd_error:
1475 channel->ops->buffer_read_close(buf);
1476 return ret;
1477}
1478
1479static
1480int lttng_abi_open_metadata_stream(struct file *channel_file)
1481{
1482 struct lttng_channel *channel = channel_file->private_data;
1483 struct lttng_session *session = channel->session;
1484 struct lib_ring_buffer *buf;
1485 int ret;
1486 struct lttng_metadata_stream *metadata_stream;
1487 void *stream_priv;
1488
1489 buf = channel->ops->buffer_read_open(channel->chan);
1490 if (!buf)
1491 return -ENOENT;
1492
1493 metadata_stream = kzalloc(sizeof(struct lttng_metadata_stream),
1494 GFP_KERNEL);
b3b8072b
MD		 1495 if (!metadata_stream) {
1496 ret = -ENOMEM;
1497 goto nomem;
1498 }
d83004aa
JD		 1499 metadata_stream->metadata_cache = session->metadata_cache;
1500 init_waitqueue_head(&metadata_stream->read_wait);
1501 metadata_stream->priv = buf;
1502 stream_priv = metadata_stream;
b3b8072b 1503 metadata_stream->transport = channel->transport;
8b97fd42
MD		 1504 /* Initial state is an empty metadata, considered as incoherent. */
1505 metadata_stream->coherent = false;
b3b8072b
MD		 1506
1507 /*
1508 * Since life-time of metadata cache differs from that of
1509 * session, we need to keep our own reference on the transport.
1510 */
1511 if (!try_module_get(metadata_stream->transport->owner)) {
5a15f70c 1512 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
b3b8072b
MD		 1513 ret = -EINVAL;
1514 goto notransport;
1515 }
1516
901aaa5f
FD		 1517 if (!lttng_kref_get(&session->metadata_cache->refcount)) {
1518 ret = -EOVERFLOW;
9c1f4643 1519 goto kref_error;
901aaa5f
FD		 1520 }
1521
d83004aa 1522 ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
a3fcd499
MD		 1523 &lttng_metadata_ring_buffer_file_operations,
1524 "[lttng_metadata_stream]");
d83004aa
JD		 1525 if (ret < 0)
1526 goto fd_error;
1527
92143b2c 1528 mutex_lock(&session->metadata_cache->lock);
d83004aa
JD		 1529 list_add(&metadata_stream->list,
1530 &session->metadata_cache->metadata_stream);
92143b2c 1531 mutex_unlock(&session->metadata_cache->lock);
d83004aa
JD		 1532 return ret;
1533
ad1c05e1 1534fd_error:
9c1f4643
MD		 1535 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
1536kref_error:
b3b8072b
MD		 1537 module_put(metadata_stream->transport->owner);
1538notransport:
1539 kfree(metadata_stream);
1540nomem:
11b5a3c2 1541 channel->ops->buffer_read_close(buf);
ad1c05e1
MD		 1542 return ret;
1543}
1544
21f58fb7
FD		 1545static
1546int lttng_abi_open_event_notifier_group_stream(struct file *notif_file)
1547{
1548 struct lttng_event_notifier_group *event_notifier_group = notif_file->private_data;
1549 struct channel *chan = event_notifier_group->chan;
1550 struct lib_ring_buffer *buf;
1551 int ret;
1552 void *stream_priv;
1553
1554 buf = event_notifier_group->ops->buffer_read_open(chan);
1555 if (!buf)
1556 return -ENOENT;
1557
1558 /* The event_notifier notification fd holds a reference on the event_notifier group */
1559 if (!atomic_long_add_unless(&notif_file->f_count, 1, LONG_MAX)) {
1560 ret = -EOVERFLOW;
1561 goto refcount_error;
1562 }
1563 event_notifier_group->buf = buf;
1564 stream_priv = event_notifier_group;
1565 ret = lttng_abi_create_stream_fd(notif_file, stream_priv,
1566 &lttng_event_notifier_group_notif_fops,
1567 "[lttng_event_notifier_stream]");
1568 if (ret < 0)
1569 goto fd_error;
1570
1571 return ret;
1572
1573fd_error:
1574 atomic_long_dec(&notif_file->f_count);
1575refcount_error:
1576 event_notifier_group->ops->buffer_read_close(buf);
1577 return ret;
1578}
1579
badfe9f5
MD		 1580static
1581int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param)
1582{
1583 /* Limit ABI to implemented features. */
1584 switch (event_param->instrumentation) {
1585 case LTTNG_KERNEL_SYSCALL:
1586 switch (event_param->u.syscall.entryexit) {
c5d12b5b
FD		 1587 case LTTNG_KERNEL_SYSCALL_ENTRY:
1588 case LTTNG_KERNEL_SYSCALL_EXIT:
badfe9f5
MD		 1589 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1590 break;
1591 default:
1592 return -EINVAL;
1593 }
1594 switch (event_param->u.syscall.abi) {
1595 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1596 break;
1597 default:
1598 return -EINVAL;
1599 }
1600 switch (event_param->u.syscall.match) {
cff6938b 1601 case LTTNG_KERNEL_SYSCALL_MATCH_NAME:
badfe9f5
MD		 1602 break;
1603 default:
1604 return -EINVAL;
1605 }
1606 break;
1607
1608 case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */
1609 case LTTNG_KERNEL_KPROBE: /* Fallthrough */
1610 case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */
1611 case LTTNG_KERNEL_NOOP: /* Fallthrough */
1612 case LTTNG_KERNEL_UPROBE:
1613 break;
1614
1615 case LTTNG_KERNEL_FUNCTION: /* Fallthrough */
1616 default:
1617 return -EINVAL;
1618 }
1619 return 0;
1620}
1621
653fe716 1622static
c0e31d2e 1623int lttng_abi_create_event(struct file *channel_file,
6dccd6c1 1624 struct lttng_kernel_event *event_param)
653fe716 1625{
a90917c3 1626 struct lttng_channel *channel = channel_file->private_data;
653fe716 1627 int event_fd, ret;
11b5a3c2 1628 struct file *event_file;
3c997079 1629 void *priv;
653fe716 1630
6dccd6c1
JD		 1631 event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
1632 switch (event_param->instrumentation) {
7371f44c 1633 case LTTNG_KERNEL_KRETPROBE:
6dccd6c1 1634 event_param->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
7371f44c 1635 break;
ab2277d6 1636 case LTTNG_KERNEL_KPROBE:
6dccd6c1 1637 event_param->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
e0a7a7c4 1638 break;
ab2277d6 1639 case LTTNG_KERNEL_FUNCTION:
e884017c
MD		 1640 WARN_ON_ONCE(1);
1641 /* Not implemented. */
e0a7a7c4
MD		 1642 break;
1643 default:
1644 break;
1645 }
33a39a3c
MD		 1646 event_fd = lttng_get_unused_fd();
1647 if (event_fd < 0) {
1648 ret = event_fd;
1649 goto fd_error;
1650 }
1651 event_file = anon_inode_getfile("[lttng_event]",
1652 &lttng_event_fops,
1653 NULL, O_RDWR);
1654 if (IS_ERR(event_file)) {
1655 ret = PTR_ERR(event_file);
1656 goto file_error;
1657 }
9c1f4643 1658 /* The event holds a reference on the channel */
98d7281c 1659 if (!atomic_long_add_unless(&channel_file->f_count, 1, LONG_MAX)) {
0d2c717f 1660 ret = -EOVERFLOW;
9c1f4643
MD		 1661 goto refcount_error;
1662 }
badfe9f5
MD		 1663 ret = lttng_abi_validate_event_param(event_param);
1664 if (ret)
1665 goto event_error;
33a39a3c
MD		 1666 if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
1667 || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
b2bc0bc8 1668 struct lttng_event_enabler *event_enabler;
33a39a3c 1669
4993071a
PP		 1670 if (strutils_is_star_glob_pattern(event_param->name)) {
1671 /*
1672 * If the event name is a star globbing pattern,
1673 * we create the special star globbing enabler.
1674 */
b2bc0bc8 1675 event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
33a39a3c 1676 event_param, channel);
3c997079 1677 } else {
b2bc0bc8 1678 event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
33a39a3c 1679 event_param, channel);
1ec65de1 1680 }
b2bc0bc8 1681 priv = event_enabler;
33a39a3c
MD		 1682 } else {
1683 struct lttng_event *event;
4ee2453d 1684
33a39a3c
MD		 1685 /*
1686 * We tolerate no failure path after event creation. It
1687 * will stay invariant for the rest of the session.
1688 */
1689 event = lttng_event_create(channel, event_param,
1690 NULL, NULL,
1691 event_param->instrumentation);
1692 WARN_ON_ONCE(!event);
1693 if (IS_ERR(event)) {
1694 ret = PTR_ERR(event);
1695 goto event_error;
80f87dd2 1696 }
33a39a3c 1697 priv = event;
03037b98 1698 }
33a39a3c
MD		 1699 event_file->private_data = priv;
1700 fd_install(event_fd, event_file);
653fe716
MD		 1701 return event_fd;
1702
03037b98 1703event_error:
9c1f4643
MD		 1704 atomic_long_dec(&channel_file->f_count);
1705refcount_error:
c0e31d2e 1706 fput(event_file);
653fe716
MD		 1707file_error:
1708 put_unused_fd(event_fd);
1709fd_error:
653fe716
MD		 1710 return ret;
1711}
ad1c05e1 1712
dffef45d
FD		 1713static
1714long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1715{
2b16f0c9 1716 struct lttng_event_notifier *event_notifier;
dffef45d
FD		 1717 struct lttng_event_notifier_enabler *event_notifier_enabler;
1718 enum lttng_event_type *evtype = file->private_data;
1719
1720 switch (cmd) {
1721 case LTTNG_KERNEL_ENABLE:
1722 switch (*evtype) {
1723 case LTTNG_TYPE_EVENT:
2b16f0c9
FD		 1724 event_notifier = file->private_data;
1725 return lttng_event_notifier_enable(event_notifier);
dffef45d
FD		 1726 case LTTNG_TYPE_ENABLER:
1727 event_notifier_enabler = file->private_data;
1728 return lttng_event_notifier_enabler_enable(event_notifier_enabler);
1729 default:
1730 WARN_ON_ONCE(1);
1731 return -ENOSYS;
1732 }
1733 case LTTNG_KERNEL_DISABLE:
1734 switch (*evtype) {
1735 case LTTNG_TYPE_EVENT:
2b16f0c9
FD		 1736 event_notifier = file->private_data;
1737 return lttng_event_notifier_disable(event_notifier);
dffef45d
FD		 1738 case LTTNG_TYPE_ENABLER:
1739 event_notifier_enabler = file->private_data;
1740 return lttng_event_notifier_enabler_disable(event_notifier_enabler);
1741 default:
1742 WARN_ON_ONCE(1);
1743 return -ENOSYS;
1744 }
1745 case LTTNG_KERNEL_FILTER:
1746 switch (*evtype) {
1747 case LTTNG_TYPE_EVENT:
1748 return -EINVAL;
1749 case LTTNG_TYPE_ENABLER:
1750 event_notifier_enabler = file->private_data;
183e8b3a
FD		 1751 return lttng_event_notifier_enabler_attach_filter_bytecode(
1752 event_notifier_enabler,
dffef45d
FD		 1753 (struct lttng_kernel_filter_bytecode __user *) arg);
1754 default:
1755 WARN_ON_ONCE(1);
1756 return -ENOSYS;
1757 }
9de67196
FD		 1758 case LTTNG_KERNEL_ADD_CALLSITE:
1759 switch (*evtype) {
1760 case LTTNG_TYPE_EVENT:
1761 event_notifier = file->private_data;
1762 return lttng_event_notifier_add_callsite(event_notifier,
1763 (struct lttng_kernel_event_callsite __user *) arg);
1764 case LTTNG_TYPE_ENABLER:
1765 return -EINVAL;
1766 default:
1767 WARN_ON_ONCE(1);
1768 return -ENOSYS;
1769 }
dffef45d
FD		 1770 default:
1771 return -ENOIOCTLCMD;
1772 }
1773}
1774
1775static
1776int lttng_event_notifier_release(struct inode *inode, struct file *file)
1777{
1778 struct lttng_event_notifier *event_notifier;
1779 struct lttng_event_notifier_enabler *event_notifier_enabler;
1780 enum lttng_event_type *evtype = file->private_data;
1781
1782 if (!evtype)
1783 return 0;
1784
1785 switch (*evtype) {
1786 case LTTNG_TYPE_EVENT:
1787 event_notifier = file->private_data;
1788 if (event_notifier)
1789 fput(event_notifier->group->file);
1790 break;
1791 case LTTNG_TYPE_ENABLER:
1792 event_notifier_enabler = file->private_data;
1793 if (event_notifier_enabler)
1794 fput(event_notifier_enabler->group->file);
1795 break;
1796 default:
1797 WARN_ON_ONCE(1);
1798 break;
1799 }
1800
1801 return 0;
1802}
1803
1804static const struct file_operations lttng_event_notifier_fops = {
1805 .owner = THIS_MODULE,
1806 .release = lttng_event_notifier_release,
1807 .unlocked_ioctl = lttng_event_notifier_ioctl,
1808#ifdef CONFIG_COMPAT
1809 .compat_ioctl = lttng_event_notifier_ioctl,
1810#endif
1811};
1812
1813static
1814int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
1815 struct lttng_kernel_event_notifier *event_notifier_param)
1816{
1817 struct lttng_event_notifier_group *event_notifier_group =
1818 event_notifier_group_file->private_data;
1819 int event_notifier_fd, ret;
1820 struct file *event_notifier_file;
1821 void *priv;
1822
1823 switch (event_notifier_param->event.instrumentation) {
1824 case LTTNG_KERNEL_TRACEPOINT:
9de67196 1825 case LTTNG_KERNEL_UPROBE:
b01155ba 1826 break;
dffef45d 1827 case LTTNG_KERNEL_KPROBE:
2b16f0c9
FD		 1828 event_notifier_param->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
1829 break;
8a8ac9a8
FD		 1830 case LTTNG_KERNEL_SYSCALL:
1831 break;
dffef45d 1832 case LTTNG_KERNEL_KRETPROBE:
9de67196 1833 /* Placing an event notifier on kretprobe is not supported. */
dffef45d
FD		 1834 case LTTNG_KERNEL_FUNCTION:
1835 case LTTNG_KERNEL_NOOP:
dffef45d
FD		 1836 default:
1837 ret = -EINVAL;
1838 goto inval_instr;
1839 }
1840
1841 event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
1842
1843 event_notifier_fd = lttng_get_unused_fd();
1844 if (event_notifier_fd < 0) {
1845 ret = event_notifier_fd;
1846 goto fd_error;
1847 }
1848
1849 event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
1850 &lttng_event_notifier_fops,
1851 NULL, O_RDWR);
1852 if (IS_ERR(event_notifier_file)) {
1853 ret = PTR_ERR(event_notifier_file);
1854 goto file_error;
1855 }
1856
1857 /* The event notifier holds a reference on the event notifier group. */
1858 if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
1859 ret = -EOVERFLOW;
1860 goto refcount_error;
1861 }
1862
1863 if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT
1864 || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) {
1865 struct lttng_event_notifier_enabler *enabler;
1866
1867 if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
1868 /*
1869 * If the event name is a star globbing pattern,
1870 * we create the special star globbing enabler.
1871 */
1872 enabler = lttng_event_notifier_enabler_create(
1873 event_notifier_group,
1874 LTTNG_ENABLER_FORMAT_STAR_GLOB,
1875 event_notifier_param);
1876 } else {
1877 enabler = lttng_event_notifier_enabler_create(
1878 event_notifier_group,
1879 LTTNG_ENABLER_FORMAT_NAME,
1880 event_notifier_param);
1881 }
1882 priv = enabler;
1883 } else {
1884 struct lttng_event_notifier *event_notifier;
1885
1886 /*
1887 * We tolerate no failure path after event notifier creation.
1888 * It will stay invariant for the rest of the session.
1889 */
1890 event_notifier = lttng_event_notifier_create(NULL,
1891 event_notifier_param->event.token, event_notifier_group,
1892 event_notifier_param, NULL,
1893 event_notifier_param->event.instrumentation);
1894 WARN_ON_ONCE(!event_notifier);
1895 if (IS_ERR(event_notifier)) {
1896 ret = PTR_ERR(event_notifier);
1897 goto event_notifier_error;
1898 }
1899 priv = event_notifier;
1900 }
1901 event_notifier_file->private_data = priv;
1902 fd_install(event_notifier_fd, event_notifier_file);
1903 return event_notifier_fd;
1904
1905event_notifier_error:
1906 atomic_long_dec(&event_notifier_group_file->f_count);
1907refcount_error:
1908 fput(event_notifier_file);
1909file_error:
1910 put_unused_fd(event_notifier_fd);
1911fd_error:
1912inval_instr:
1913 return ret;
1914}
1915
750b05f2
FD		 1916static
1917long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
1918 unsigned long arg)
1919{
1920 switch (cmd) {
21f58fb7
FD		 1921 case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD:
1922 {
1923 return lttng_abi_open_event_notifier_group_stream(file);
1924 }
dffef45d
FD		 1925 case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE:
1926 {
1927 struct lttng_kernel_event_notifier uevent_notifier_param;
1928
1929 if (copy_from_user(&uevent_notifier_param,
1930 (struct lttng_kernel_event_notifier __user *) arg,
1931 sizeof(uevent_notifier_param)))
1932 return -EFAULT;
1933 return lttng_abi_create_event_notifier(file, &uevent_notifier_param);
1934 }
750b05f2
FD		 1935 default:
1936 return -ENOIOCTLCMD;
1937 }
1938 return 0;
1939}
1940
1941static
1942int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
1943{
1944 struct lttng_event_notifier_group *event_notifier_group =
1945 file->private_data;
1946
1947 if (event_notifier_group)
1948 lttng_event_notifier_group_destroy(event_notifier_group);
1949 return 0;
1950}
1951
1952static const struct file_operations lttng_event_notifier_group_fops = {
1953 .owner = THIS_MODULE,
1954 .release = lttng_event_notifier_group_release,
1955 .unlocked_ioctl = lttng_event_notifier_group_ioctl,
1956#ifdef CONFIG_COMPAT
1957 .compat_ioctl = lttng_event_notifier_group_ioctl,
1958#endif
1959};
1960
ad1c05e1
MD		 1961/**
1962 * lttng_channel_ioctl - lttng syscall through ioctl
1963 *
c0e31d2e 1964 * @file: the file
ad1c05e1
MD		 1965 * @cmd: the command
1966 * @arg: command arg
1967 *
1968 * This ioctl implements lttng commands:
38d024ae 1969 * LTTNG_KERNEL_STREAM
ad1c05e1
MD		 1970 * Returns an event stream file descriptor or failure.
1971 * (typically, one event stream records events from one CPU)
38d024ae 1972 * LTTNG_KERNEL_EVENT
ad1c05e1 1973 * Returns an event file descriptor or failure.
8070f5c0
MD		 1974 * LTTNG_KERNEL_CONTEXT
1975 * Prepend a context field to each event in the channel
e64957da
MD		 1976 * LTTNG_KERNEL_ENABLE
1977 * Enable recording for events in this channel (weak enable)
1978 * LTTNG_KERNEL_DISABLE
1979 * Disable recording for events in this channel (strong disable)
baf20995 1980 *
baf20995
MD		 1981 * Channel and event file descriptors also hold a reference on the session.
1982 */
ad1c05e1 1983static
c0e31d2e 1984long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
baf20995 1985{
a90917c3 1986 struct lttng_channel *channel = file->private_data;
8070f5c0 1987
baf20995 1988 switch (cmd) {
6dccd6c1 1989 case LTTNG_KERNEL_OLD_STREAM:
38d024ae 1990 case LTTNG_KERNEL_STREAM:
c0e31d2e 1991 return lttng_abi_open_stream(file);
6dccd6c1
JD		 1992 case LTTNG_KERNEL_OLD_EVENT:
1993 {
1994 struct lttng_kernel_event *uevent_param;
1995 struct lttng_kernel_old_event *old_uevent_param;
1996 int ret;
1997
1998 uevent_param = kmalloc(sizeof(struct lttng_kernel_event),
1999 GFP_KERNEL);
2000 if (!uevent_param) {
2001 ret = -ENOMEM;
2002 goto old_event_end;
2003 }
2004 old_uevent_param = kmalloc(
2005 sizeof(struct lttng_kernel_old_event),
2006 GFP_KERNEL);
2007 if (!old_uevent_param) {
2008 ret = -ENOMEM;
2009 goto old_event_error_free_param;
2010 }
2011 if (copy_from_user(old_uevent_param,
2012 (struct lttng_kernel_old_event __user *) arg,
2013 sizeof(struct lttng_kernel_old_event))) {
2014 ret = -EFAULT;
2015 goto old_event_error_free_old_param;
2016 }
2017
2018 memcpy(uevent_param->name, old_uevent_param->name,
2019 sizeof(uevent_param->name));
2020 uevent_param->instrumentation =
2021 old_uevent_param->instrumentation;
2022
2023 switch (old_uevent_param->instrumentation) {
2024 case LTTNG_KERNEL_KPROBE:
2025 uevent_param->u.kprobe.addr =
2026 old_uevent_param->u.kprobe.addr;
2027 uevent_param->u.kprobe.offset =
2028 old_uevent_param->u.kprobe.offset;
2029 memcpy(uevent_param->u.kprobe.symbol_name,
2030 old_uevent_param->u.kprobe.symbol_name,
2031 sizeof(uevent_param->u.kprobe.symbol_name));
2032 break;
2033 case LTTNG_KERNEL_KRETPROBE:
2034 uevent_param->u.kretprobe.addr =
2035 old_uevent_param->u.kretprobe.addr;
2036 uevent_param->u.kretprobe.offset =
2037 old_uevent_param->u.kretprobe.offset;
2038 memcpy(uevent_param->u.kretprobe.symbol_name,
2039 old_uevent_param->u.kretprobe.symbol_name,
2040 sizeof(uevent_param->u.kretprobe.symbol_name));
2041 break;
2042 case LTTNG_KERNEL_FUNCTION:
e884017c
MD		 2043 WARN_ON_ONCE(1);
2044 /* Not implemented. */
6dccd6c1
JD		 2045 break;
2046 default:
2047 break;
2048 }
2049 ret = lttng_abi_create_event(file, uevent_param);
2050
2051old_event_error_free_old_param:
2052 kfree(old_uevent_param);
2053old_event_error_free_param:
2054 kfree(uevent_param);
2055old_event_end:
2056 return ret;
2057 }
38d024ae 2058 case LTTNG_KERNEL_EVENT:
6dccd6c1
JD		 2059 {
2060 struct lttng_kernel_event uevent_param;
2061
2062 if (copy_from_user(&uevent_param,
2063 (struct lttng_kernel_event __user *) arg,
2064 sizeof(uevent_param)))
2065 return -EFAULT;
2066 return lttng_abi_create_event(file, &uevent_param);
2067 }
2068 case LTTNG_KERNEL_OLD_CONTEXT:
2069 {
2070 struct lttng_kernel_context *ucontext_param;
2071 struct lttng_kernel_old_context *old_ucontext_param;
2072 int ret;
2073
2074 ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
2075 GFP_KERNEL);
2076 if (!ucontext_param) {
2077 ret = -ENOMEM;
2078 goto old_ctx_end;
2079 }
2080 old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
2081 GFP_KERNEL);
2082 if (!old_ucontext_param) {
2083 ret = -ENOMEM;
2084 goto old_ctx_error_free_param;
2085 }
2086
2087 if (copy_from_user(old_ucontext_param,
2088 (struct lttng_kernel_old_context __user *) arg,
2089 sizeof(struct lttng_kernel_old_context))) {
2090 ret = -EFAULT;
2091 goto old_ctx_error_free_old_param;
2092 }
2093 ucontext_param->ctx = old_ucontext_param->ctx;
2094 memcpy(ucontext_param->padding, old_ucontext_param->padding,
2095 sizeof(ucontext_param->padding));
2096 /* only type that uses the union */
2097 if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
2098 ucontext_param->u.perf_counter.type =
2099 old_ucontext_param->u.perf_counter.type;
2100 ucontext_param->u.perf_counter.config =
2101 old_ucontext_param->u.perf_counter.config;
2102 memcpy(ucontext_param->u.perf_counter.name,
2103 old_ucontext_param->u.perf_counter.name,
2104 sizeof(ucontext_param->u.perf_counter.name));
2105 }
2106
2107 ret = lttng_abi_add_context(file,
2108 ucontext_param,
2109 &channel->ctx, channel->session);
2110
2111old_ctx_error_free_old_param:
2112 kfree(old_ucontext_param);
2113old_ctx_error_free_param:
2114 kfree(ucontext_param);
2115old_ctx_end:
2116 return ret;
2117 }
8070f5c0 2118 case LTTNG_KERNEL_CONTEXT:
6dccd6c1
JD		 2119 {
2120 struct lttng_kernel_context ucontext_param;
2121
2122 if (copy_from_user(&ucontext_param,
8070f5c0 2123 (struct lttng_kernel_context __user *) arg,
6dccd6c1
JD		 2124 sizeof(ucontext_param)))
2125 return -EFAULT;
2126 return lttng_abi_add_context(file,
2127 &ucontext_param,
8070f5c0 2128 &channel->ctx, channel->session);
6dccd6c1
JD		 2129 }
2130 case LTTNG_KERNEL_OLD_ENABLE:
e64957da 2131 case LTTNG_KERNEL_ENABLE:
a90917c3 2132 return lttng_channel_enable(channel);
6dccd6c1 2133 case LTTNG_KERNEL_OLD_DISABLE:
e64957da 2134 case LTTNG_KERNEL_DISABLE:
a90917c3 2135 return lttng_channel_disable(channel);
12e579db
MD		 2136 case LTTNG_KERNEL_SYSCALL_MASK:
2137 return lttng_channel_syscall_mask(channel,
2138 (struct lttng_kernel_syscall_mask __user *) arg);
baf20995
MD		 2139 default:
2140 return -ENOIOCTLCMD;
2141 }
2142}
2143
5dbbdb43
MD		 2144/**
2145 * lttng_metadata_ioctl - lttng syscall through ioctl
2146 *
2147 * @file: the file
2148 * @cmd: the command
2149 * @arg: command arg
2150 *
2151 * This ioctl implements lttng commands:
38d024ae 2152 * LTTNG_KERNEL_STREAM
5dbbdb43
MD		 2153 * Returns an event stream file descriptor or failure.
2154 *
2155 * Channel and event file descriptors also hold a reference on the session.
2156 */
2157static
2158long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2159{
2160 switch (cmd) {
6dccd6c1 2161 case LTTNG_KERNEL_OLD_STREAM:
38d024ae 2162 case LTTNG_KERNEL_STREAM:
d83004aa 2163 return lttng_abi_open_metadata_stream(file);
5dbbdb43
MD		 2164 default:
2165 return -ENOIOCTLCMD;
2166 }
2167}
2168
653fe716
MD		 2169/**
2170 * lttng_channel_poll - lttng stream addition/removal monitoring
2171 *
c0e31d2e 2172 * @file: the file
653fe716
MD		 2173 * @wait: poll table
2174 */
c0e31d2e 2175unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
653fe716 2176{
a90917c3 2177 struct lttng_channel *channel = file->private_data;
653fe716
MD		 2178 unsigned int mask = 0;
2179
c0e31d2e 2180 if (file->f_mode & FMODE_READ) {
a33e44a6 2181 poll_wait_set_exclusive(wait);
24cedcfe
MD		 2182 poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan),
2183 wait);
653fe716 2184
254ec7bc
MD		 2185 if (channel->ops->is_disabled(channel->chan))
2186 return POLLERR;
24cedcfe 2187 if (channel->ops->is_finalized(channel->chan))
653fe716 2188 return POLLHUP;
f71ecafa 2189 if (channel->ops->buffer_has_read_closed_stream(channel->chan))
653fe716 2190 return POLLIN | POLLRDNORM;
f71ecafa 2191 return 0;
653fe716
MD		 2192 }
2193 return mask;
2194
2195}
2196
0a84a57f
MD		 2197static
2198int lttng_channel_release(struct inode *inode, struct file *file)
2199{
a90917c3 2200 struct lttng_channel *channel = file->private_data;
c269fff4
MD		 2201
2202 if (channel)
2203 fput(channel->session->file);
0a84a57f
MD		 2204 return 0;
2205}
2206
d83004aa
JD		 2207static
2208int lttng_metadata_channel_release(struct inode *inode, struct file *file)
2209{
2210 struct lttng_channel *channel = file->private_data;
2211
2212 if (channel) {
d83004aa 2213 fput(channel->session->file);
a3381417 2214 lttng_metadata_channel_destroy(channel);
d83004aa
JD		 2215 }
2216
2217 return 0;
2218}
2219
ad1c05e1 2220static const struct file_operations lttng_channel_fops = {
a33c9927 2221 .owner = THIS_MODULE,
03037b98 2222 .release = lttng_channel_release,
653fe716 2223 .poll = lttng_channel_poll,
ad1c05e1 2224 .unlocked_ioctl = lttng_channel_ioctl,
baf20995 2225#ifdef CONFIG_COMPAT
03037b98 2226 .compat_ioctl = lttng_channel_ioctl,
baf20995 2227#endif
11b5a3c2 2228};
baf20995 2229
5dbbdb43 2230static const struct file_operations lttng_metadata_fops = {
a33c9927 2231 .owner = THIS_MODULE,
d83004aa 2232 .release = lttng_metadata_channel_release,
5dbbdb43
MD		 2233 .unlocked_ioctl = lttng_metadata_ioctl,
2234#ifdef CONFIG_COMPAT
2235 .compat_ioctl = lttng_metadata_ioctl,
2236#endif
2237};
2238
8070f5c0
MD		 2239/**
2240 * lttng_event_ioctl - lttng syscall through ioctl
2241 *
2242 * @file: the file
2243 * @cmd: the command
2244 * @arg: command arg
2245 *
2246 * This ioctl implements lttng commands:
8070f5c0
MD		 2247 * LTTNG_KERNEL_CONTEXT
2248 * Prepend a context field to each record of this event
e64957da
MD		 2249 * LTTNG_KERNEL_ENABLE
2250 * Enable recording for this event (weak enable)
2251 * LTTNG_KERNEL_DISABLE
2252 * Disable recording for this event (strong disable)
8070f5c0
MD		 2253 */
2254static
2255long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2256{
3c997079 2257 struct lttng_event *event;
b2bc0bc8 2258 struct lttng_event_enabler *event_enabler;
3c997079 2259 enum lttng_event_type *evtype = file->private_data;
8070f5c0
MD		 2260
2261 switch (cmd) {
6dccd6c1
JD		 2262 case LTTNG_KERNEL_OLD_CONTEXT:
2263 {
3c997079
MD		 2264 /* Not implemented */
2265 return -ENOSYS;
6dccd6c1 2266 }
8070f5c0 2267 case LTTNG_KERNEL_CONTEXT:
6dccd6c1 2268 {
3c997079
MD		 2269 /* Not implemented */
2270 return -ENOSYS;
6dccd6c1
JD		 2271 }
2272 case LTTNG_KERNEL_OLD_ENABLE:
e64957da 2273 case LTTNG_KERNEL_ENABLE:
3c997079
MD		 2274 switch (*evtype) {
2275 case LTTNG_TYPE_EVENT:
2276 event = file->private_data;
2277 return lttng_event_enable(event);
2278 case LTTNG_TYPE_ENABLER:
b2bc0bc8
FD		 2279 event_enabler = file->private_data;
2280 return lttng_event_enabler_enable(event_enabler);
3c997079
MD		 2281 default:
2282 WARN_ON_ONCE(1);
2283 return -ENOSYS;
2284 }
6dccd6c1 2285 case LTTNG_KERNEL_OLD_DISABLE:
e64957da 2286 case LTTNG_KERNEL_DISABLE:
3c997079
MD		 2287 switch (*evtype) {
2288 case LTTNG_TYPE_EVENT:
2289 event = file->private_data;
2290 return lttng_event_disable(event);
2291 case LTTNG_TYPE_ENABLER:
b2bc0bc8
FD		 2292 event_enabler = file->private_data;
2293 return lttng_event_enabler_disable(event_enabler);
3c997079
MD		 2294 default:
2295 WARN_ON_ONCE(1);
2296 return -ENOSYS;
2297 }
07dfc1d0
MD		 2298 case LTTNG_KERNEL_FILTER:
2299 switch (*evtype) {
2300 case LTTNG_TYPE_EVENT:
2301 return -EINVAL;
2302 case LTTNG_TYPE_ENABLER:
2303 {
b2bc0bc8 2304 event_enabler = file->private_data;
183e8b3a
FD		 2305 return lttng_event_enabler_attach_filter_bytecode(
2306 event_enabler,
07dfc1d0
MD		 2307 (struct lttng_kernel_filter_bytecode __user *) arg);
2308 }
0586316f
MD		 2309 default:
2310 WARN_ON_ONCE(1);
2311 return -ENOSYS;
07dfc1d0 2312 }
3aed4dca
FD		 2313 case LTTNG_KERNEL_ADD_CALLSITE:
2314 switch (*evtype) {
2315 case LTTNG_TYPE_EVENT:
2316 event = file->private_data;
2317 return lttng_event_add_callsite(event,
2318 (struct lttng_kernel_event_callsite __user *) arg);
2319 case LTTNG_TYPE_ENABLER:
2320 return -EINVAL;
64c147c0
MD		 2321 default:
2322 WARN_ON_ONCE(1);
2323 return -ENOSYS;
3aed4dca 2324 }
8070f5c0
MD		 2325 default:
2326 return -ENOIOCTLCMD;
2327 }
2328}
2329
0a84a57f
MD		 2330static
2331int lttng_event_release(struct inode *inode, struct file *file)
2332{
3c997079 2333 struct lttng_event *event;
b2bc0bc8 2334 struct lttng_event_enabler *event_enabler;
3c997079
MD		 2335 enum lttng_event_type *evtype = file->private_data;
2336
2337 if (!evtype)
2338 return 0;
2339
2340 switch (*evtype) {
2341 case LTTNG_TYPE_EVENT:
2342 event = file->private_data;
2343 if (event)
2344 fput(event->chan->file);
2345 break;
2346 case LTTNG_TYPE_ENABLER:
b2bc0bc8
FD		 2347 event_enabler = file->private_data;
2348 if (event_enabler)
2349 fput(event_enabler->chan->file);
3c997079
MD		 2350 break;
2351 default:
2352 WARN_ON_ONCE(1);
2353 break;
2354 }
c269fff4 2355
0a84a57f
MD		 2356 return 0;
2357}
2358
3b923e5b 2359/* TODO: filter control ioctl */
0a84a57f 2360static const struct file_operations lttng_event_fops = {
a33c9927 2361 .owner = THIS_MODULE,
0a84a57f 2362 .release = lttng_event_release,
8070f5c0
MD		 2363 .unlocked_ioctl = lttng_event_ioctl,
2364#ifdef CONFIG_COMPAT
2365 .compat_ioctl = lttng_event_ioctl,
2366#endif
11b5a3c2 2367};
0a84a57f 2368
3b731ab1
JD		 2369static int put_u64(uint64_t val, unsigned long arg)
2370{
2371 return put_user(val, (uint64_t __user *) arg);
2372}
2373
8b97fd42
MD		 2374static int put_u32(uint32_t val, unsigned long arg)
2375{
2376 return put_user(val, (uint32_t __user *) arg);
2377}
2378
ed8d02d6
JD		 2379static long lttng_stream_ring_buffer_ioctl(struct file *filp,
2380 unsigned int cmd, unsigned long arg)
2381{
3b731ab1
JD		 2382 struct lib_ring_buffer *buf = filp->private_data;
2383 struct channel *chan = buf->backend.chan;
2384 const struct lib_ring_buffer_config *config = &chan->backend.config;
dd5a0db3 2385 const struct lttng_channel_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 2386 int ret;
2387
2388 if (atomic_read(&chan->record_disabled))
2389 return -EIO;
2390
ed8d02d6 2391 switch (cmd) {
3b731ab1
JD		 2392 case LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN:
2393 {
2394 uint64_t ts;
2395
dd5a0db3 2396 ret = ops->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 2397 if (ret < 0)
2398 goto error;
2399 return put_u64(ts, arg);
2400 }
2401 case LTTNG_RING_BUFFER_GET_TIMESTAMP_END:
2402 {
2403 uint64_t ts;
2404
dd5a0db3 2405 ret = ops->timestamp_end(config, buf, &ts);
3b731ab1
JD		 2406 if (ret < 0)
2407 goto error;
2408 return put_u64(ts, arg);
2409 }
2410 case LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED:
2411 {
2412 uint64_t ed;
2413
dd5a0db3 2414 ret = ops->events_discarded(config, buf, &ed);
3b731ab1
JD		 2415 if (ret < 0)
2416 goto error;
2417 return put_u64(ed, arg);
2418 }
2419 case LTTNG_RING_BUFFER_GET_CONTENT_SIZE:
2420 {
2421 uint64_t cs;
2422
dd5a0db3 2423 ret = ops->content_size(config, buf, &cs);
3b731ab1
JD		 2424 if (ret < 0)
2425 goto error;
2426 return put_u64(cs, arg);
2427 }
2428 case LTTNG_RING_BUFFER_GET_PACKET_SIZE:
2429 {
2430 uint64_t ps;
2431
dd5a0db3 2432 ret = ops->packet_size(config, buf, &ps);
3b731ab1
JD		 2433 if (ret < 0)
2434 goto error;
2435 return put_u64(ps, arg);
2436 }
2437 case LTTNG_RING_BUFFER_GET_STREAM_ID:
2438 {
2439 uint64_t si;
2440
dd5a0db3 2441 ret = ops->stream_id(config, buf, &si);
3b731ab1
JD		 2442 if (ret < 0)
2443 goto error;
2444 return put_u64(si, arg);
2445 }
2348ca17
JD		 2446 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
2447 {
2448 uint64_t ts;
2449
dd5a0db3 2450 ret = ops->current_timestamp(config, buf, &ts);
2348ca17
JD		 2451 if (ret < 0)
2452 goto error;
2453 return put_u64(ts, arg);
2454 }
5b3cf4f9
JD		 2455 case LTTNG_RING_BUFFER_GET_SEQ_NUM:
2456 {
2457 uint64_t seq;
2458
2459 ret = ops->sequence_number(config, buf, &seq);
2460 if (ret < 0)
2461 goto error;
2462 return put_u64(seq, arg);
2463 }
5594698f
JD		 2464 case LTTNG_RING_BUFFER_INSTANCE_ID:
2465 {
2466 uint64_t id;
2467
2468 ret = ops->instance_id(config, buf, &id);
2469 if (ret < 0)
2470 goto error;
2471 return put_u64(id, arg);
2472 }
3b731ab1
JD		 2473 default:
2474 return lib_ring_buffer_file_operations.unlocked_ioctl(filp,
2475 cmd, arg);
ed8d02d6 2476 }
3b731ab1
JD		 2477
2478error:
2479 return -ENOSYS;
ed8d02d6
JD		 2480}
2481
2482#ifdef CONFIG_COMPAT
2483static long lttng_stream_ring_buffer_compat_ioctl(struct file *filp,
2484 unsigned int cmd, unsigned long arg)
2485{
3b731ab1
JD		 2486 struct lib_ring_buffer *buf = filp->private_data;
2487 struct channel *chan = buf->backend.chan;
2488 const struct lib_ring_buffer_config *config = &chan->backend.config;
dd5a0db3 2489 const struct lttng_channel_ops *ops = chan->backend.priv_ops;
3b731ab1
JD		 2490 int ret;
2491
2492 if (atomic_read(&chan->record_disabled))
2493 return -EIO;
2494
ed8d02d6 2495 switch (cmd) {
3b731ab1
JD		 2496 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN:
2497 {
2498 uint64_t ts;
2499
dd5a0db3 2500 ret = ops->timestamp_begin(config, buf, &ts);
3b731ab1
JD		 2501 if (ret < 0)
2502 goto error;
2503 return put_u64(ts, arg);
2504 }
2505 case LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END:
2506 {
2507 uint64_t ts;
2508
dd5a0db3 2509 ret = ops->timestamp_end(config, buf, &ts);
3b731ab1
JD		 2510 if (ret < 0)
2511 goto error;
2512 return put_u64(ts, arg);
2513 }
2514 case LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED:
2515 {
2516 uint64_t ed;
2517
dd5a0db3 2518 ret = ops->events_discarded(config, buf, &ed);
3b731ab1
JD		 2519 if (ret < 0)
2520 goto error;
2521 return put_u64(ed, arg);
ed8d02d6 2522 }
3b731ab1
JD		 2523 case LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE:
2524 {
2525 uint64_t cs;
2526
dd5a0db3 2527 ret = ops->content_size(config, buf, &cs);
3b731ab1
JD		 2528 if (ret < 0)
2529 goto error;
2530 return put_u64(cs, arg);
2531 }
2532 case LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE:
2533 {
2534 uint64_t ps;
2535
dd5a0db3 2536 ret = ops->packet_size(config, buf, &ps);
3b731ab1
JD		 2537 if (ret < 0)
2538 goto error;
2539 return put_u64(ps, arg);
2540 }
2541 case LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID:
2542 {
2543 uint64_t si;
2544
dd5a0db3 2545 ret = ops->stream_id(config, buf, &si);
3b731ab1
JD		 2546 if (ret < 0)
2547 goto error;
2548 return put_u64(si, arg);
2549 }
2348ca17
JD		 2550 case LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP:
2551 {
2552 uint64_t ts;
2553
dd5a0db3 2554 ret = ops->current_timestamp(config, buf, &ts);
2348ca17
JD		 2555 if (ret < 0)
2556 goto error;
2557 return put_u64(ts, arg);
2558 }
5b3cf4f9
JD		 2559 case LTTNG_RING_BUFFER_COMPAT_GET_SEQ_NUM:
2560 {
2561 uint64_t seq;
2562
2563 ret = ops->sequence_number(config, buf, &seq);
2564 if (ret < 0)
2565 goto error;
2566 return put_u64(seq, arg);
2567 }
5594698f
JD		 2568 case LTTNG_RING_BUFFER_COMPAT_INSTANCE_ID:
2569 {
2570 uint64_t id;
2571
2572 ret = ops->instance_id(config, buf, &id);
2573 if (ret < 0)
2574 goto error;
2575 return put_u64(id, arg);
2576 }
3b731ab1
JD		 2577 default:
2578 return lib_ring_buffer_file_operations.compat_ioctl(filp,
2579 cmd, arg);
2580 }
2581
2582error:
2583 return -ENOSYS;
ed8d02d6
JD		 2584}
2585#endif /* CONFIG_COMPAT */
2586
2587static void lttng_stream_override_ring_buffer_fops(void)
2588{
2589 lttng_stream_ring_buffer_file_operations.owner = THIS_MODULE;
2590 lttng_stream_ring_buffer_file_operations.open =
2591 lib_ring_buffer_file_operations.open;
2592 lttng_stream_ring_buffer_file_operations.release =
2593 lib_ring_buffer_file_operations.release;
2594 lttng_stream_ring_buffer_file_operations.poll =
2595 lib_ring_buffer_file_operations.poll;
2596 lttng_stream_ring_buffer_file_operations.splice_read =
2597 lib_ring_buffer_file_operations.splice_read;
2598 lttng_stream_ring_buffer_file_operations.mmap =
2599 lib_ring_buffer_file_operations.mmap;
2600 lttng_stream_ring_buffer_file_operations.unlocked_ioctl =
2601 lttng_stream_ring_buffer_ioctl;
2602 lttng_stream_ring_buffer_file_operations.llseek =
2603 lib_ring_buffer_file_operations.llseek;
2604#ifdef CONFIG_COMPAT
2605 lttng_stream_ring_buffer_file_operations.compat_ioctl =
2606 lttng_stream_ring_buffer_compat_ioctl;
2607#endif
2608}
2609
80996790 2610int __init lttng_abi_init(void)
baf20995
MD		 2611{
2612 int ret = 0;
2613
263b6c88 2614 wrapper_vmalloc_sync_mappings();
2754583e 2615 lttng_clock_ref();
f771eda6
JD		 2616
2617 ret = lttng_tp_mempool_init();
2618 if (ret) {
2619 goto error;
2620 }
2621
d29348f7 2622 lttng_proc_dentry = proc_create_data("lttng", S_IRUSR | S_IWUSR, NULL,
059de147 2623 &lttng_proc_ops, NULL);
2470a237 2624
255e52a4 2625 if (!lttng_proc_dentry) {
5a15f70c 2626 printk(KERN_ERR "LTTng: Error creating control file\n");
baf20995
MD		 2627 ret = -ENOMEM;
2628 goto error;
2629 }
ed8d02d6 2630 lttng_stream_override_ring_buffer_fops();
2754583e 2631 return 0;
ed8d02d6 2632
baf20995 2633error:
f771eda6 2634 lttng_tp_mempool_destroy();
2754583e 2635 lttng_clock_unref();
baf20995
MD		 2636 return ret;
2637}
2638
e6e65fcd
MD		 2639/* No __exit annotation because used by init error path too. */
2640void lttng_abi_exit(void)
baf20995 2641{
f771eda6 2642 lttng_tp_mempool_destroy();
2754583e 2643 lttng_clock_unref();
e6a17f26
MD		 2644 if (lttng_proc_dentry)
2645 remove_proc_entry("lttng", NULL);
baf20995 2646}
LTTng 2.0/0.x modules
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